Commit | Line | Data |
---|---|---|
e8689e63 LW |
1 | /* |
2 | * Copyright (c) 2006 ARM Ltd. | |
3 | * Copyright (c) 2010 ST-Ericsson SA | |
4 | * | |
5 | * Author: Peter Pearse <peter.pearse@arm.com> | |
6 | * Author: Linus Walleij <linus.walleij@stericsson.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the Free | |
10 | * Software Foundation; either version 2 of the License, or (at your option) | |
11 | * any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
14 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
16 | * more details. | |
17 | * | |
94ae8522 RKAL |
18 | * The full GNU General Public License is in this distribution in the file |
19 | * called COPYING. | |
e8689e63 LW |
20 | * |
21 | * Documentation: ARM DDI 0196G == PL080 | |
94ae8522 | 22 | * Documentation: ARM DDI 0218E == PL081 |
da1b6c05 | 23 | * Documentation: S3C6410 User's Manual == PL080S |
e8689e63 | 24 | * |
94ae8522 RKAL |
25 | * PL080 & PL081 both have 16 sets of DMA signals that can be routed to any |
26 | * channel. | |
e8689e63 LW |
27 | * |
28 | * The PL080 has 8 channels available for simultaneous use, and the PL081 | |
29 | * has only two channels. So on these DMA controllers the number of channels | |
30 | * and the number of incoming DMA signals are two totally different things. | |
31 | * It is usually not possible to theoretically handle all physical signals, | |
32 | * so a multiplexing scheme with possible denial of use is necessary. | |
33 | * | |
34 | * The PL080 has a dual bus master, PL081 has a single master. | |
35 | * | |
da1b6c05 TF |
36 | * PL080S is a version modified by Samsung and used in S3C64xx SoCs. |
37 | * It differs in following aspects: | |
38 | * - CH_CONFIG register at different offset, | |
39 | * - separate CH_CONTROL2 register for transfer size, | |
40 | * - bigger maximum transfer size, | |
41 | * - 8-word aligned LLI, instead of 4-word, due to extra CCTL2 word, | |
42 | * - no support for peripheral flow control. | |
43 | * | |
e8689e63 LW |
44 | * Memory to peripheral transfer may be visualized as |
45 | * Get data from memory to DMAC | |
46 | * Until no data left | |
47 | * On burst request from peripheral | |
48 | * Destination burst from DMAC to peripheral | |
49 | * Clear burst request | |
50 | * Raise terminal count interrupt | |
51 | * | |
52 | * For peripherals with a FIFO: | |
53 | * Source burst size == half the depth of the peripheral FIFO | |
54 | * Destination burst size == the depth of the peripheral FIFO | |
55 | * | |
56 | * (Bursts are irrelevant for mem to mem transfers - there are no burst | |
57 | * signals, the DMA controller will simply facilitate its AHB master.) | |
58 | * | |
59 | * ASSUMES default (little) endianness for DMA transfers | |
60 | * | |
9dc2c200 RKAL |
61 | * The PL08x has two flow control settings: |
62 | * - DMAC flow control: the transfer size defines the number of transfers | |
63 | * which occur for the current LLI entry, and the DMAC raises TC at the | |
64 | * end of every LLI entry. Observed behaviour shows the DMAC listening | |
65 | * to both the BREQ and SREQ signals (contrary to documented), | |
66 | * transferring data if either is active. The LBREQ and LSREQ signals | |
67 | * are ignored. | |
68 | * | |
69 | * - Peripheral flow control: the transfer size is ignored (and should be | |
70 | * zero). The data is transferred from the current LLI entry, until | |
71 | * after the final transfer signalled by LBREQ or LSREQ. The DMAC | |
da1b6c05 | 72 | * will then move to the next LLI entry. Unsupported by PL080S. |
e8689e63 | 73 | */ |
730404ac | 74 | #include <linux/amba/bus.h> |
e8689e63 LW |
75 | #include <linux/amba/pl08x.h> |
76 | #include <linux/debugfs.h> | |
0c38d701 VK |
77 | #include <linux/delay.h> |
78 | #include <linux/device.h> | |
79 | #include <linux/dmaengine.h> | |
80 | #include <linux/dmapool.h> | |
8516f52f | 81 | #include <linux/dma-mapping.h> |
6d05c9fa | 82 | #include <linux/export.h> |
0c38d701 VK |
83 | #include <linux/init.h> |
84 | #include <linux/interrupt.h> | |
85 | #include <linux/module.h> | |
aa4734da LW |
86 | #include <linux/of.h> |
87 | #include <linux/of_dma.h> | |
b7b6018b | 88 | #include <linux/pm_runtime.h> |
e8689e63 | 89 | #include <linux/seq_file.h> |
0c38d701 | 90 | #include <linux/slab.h> |
3a95b9fb | 91 | #include <linux/amba/pl080.h> |
e8689e63 | 92 | |
d2ebfb33 | 93 | #include "dmaengine.h" |
01d8dc64 | 94 | #include "virt-dma.h" |
d2ebfb33 | 95 | |
e8689e63 LW |
96 | #define DRIVER_NAME "pl08xdmac" |
97 | ||
ea524c7e MB |
98 | #define PL80X_DMA_BUSWIDTHS \ |
99 | BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) | \ | |
100 | BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \ | |
101 | BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \ | |
102 | BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | |
103 | ||
7703eac9 | 104 | static struct amba_driver pl08x_amba_driver; |
b23f204c | 105 | struct pl08x_driver_data; |
7703eac9 | 106 | |
e8689e63 | 107 | /** |
94ae8522 | 108 | * struct vendor_data - vendor-specific config parameters for PL08x derivatives |
e8689e63 | 109 | * @channels: the number of channels available in this variant |
f9cd4761 | 110 | * @signals: the number of request signals available from the hardware |
94ae8522 | 111 | * @dualmaster: whether this version supports dual AHB masters or not. |
affa115e LW |
112 | * @nomadik: whether the channels have Nomadik security extension bits |
113 | * that need to be checked for permission before use and some registers are | |
114 | * missing | |
da1b6c05 TF |
115 | * @pl080s: whether this version is a PL080S, which has separate register and |
116 | * LLI word for transfer size. | |
f9cd4761 LW |
117 | * @max_transfer_size: the maximum single element transfer size for this |
118 | * PL08x variant. | |
e8689e63 LW |
119 | */ |
120 | struct vendor_data { | |
d86ccea7 | 121 | u8 config_offset; |
e8689e63 | 122 | u8 channels; |
f9cd4761 | 123 | u8 signals; |
e8689e63 | 124 | bool dualmaster; |
affa115e | 125 | bool nomadik; |
da1b6c05 | 126 | bool pl080s; |
5110e51d | 127 | u32 max_transfer_size; |
e8689e63 LW |
128 | }; |
129 | ||
b23f204c RK |
130 | /** |
131 | * struct pl08x_bus_data - information of source or destination | |
132 | * busses for a transfer | |
133 | * @addr: current address | |
134 | * @maxwidth: the maximum width of a transfer on this bus | |
135 | * @buswidth: the width of this bus in bytes: 1, 2 or 4 | |
136 | */ | |
137 | struct pl08x_bus_data { | |
138 | dma_addr_t addr; | |
139 | u8 maxwidth; | |
140 | u8 buswidth; | |
141 | }; | |
142 | ||
1c38b289 AP |
143 | #define IS_BUS_ALIGNED(bus) IS_ALIGNED((bus)->addr, (bus)->buswidth) |
144 | ||
b23f204c RK |
145 | /** |
146 | * struct pl08x_phy_chan - holder for the physical channels | |
147 | * @id: physical index to this channel | |
148 | * @lock: a lock to use when altering an instance of this struct | |
b23f204c RK |
149 | * @serving: the virtual channel currently being served by this physical |
150 | * channel | |
ad0de2ac RK |
151 | * @locked: channel unavailable for the system, e.g. dedicated to secure |
152 | * world | |
b23f204c RK |
153 | */ |
154 | struct pl08x_phy_chan { | |
155 | unsigned int id; | |
156 | void __iomem *base; | |
d86ccea7 | 157 | void __iomem *reg_config; |
b23f204c | 158 | spinlock_t lock; |
b23f204c | 159 | struct pl08x_dma_chan *serving; |
ad0de2ac | 160 | bool locked; |
b23f204c RK |
161 | }; |
162 | ||
163 | /** | |
164 | * struct pl08x_sg - structure containing data per sg | |
165 | * @src_addr: src address of sg | |
166 | * @dst_addr: dst address of sg | |
167 | * @len: transfer len in bytes | |
168 | * @node: node for txd's dsg_list | |
169 | */ | |
170 | struct pl08x_sg { | |
171 | dma_addr_t src_addr; | |
172 | dma_addr_t dst_addr; | |
173 | size_t len; | |
174 | struct list_head node; | |
175 | }; | |
176 | ||
177 | /** | |
178 | * struct pl08x_txd - wrapper for struct dma_async_tx_descriptor | |
01d8dc64 | 179 | * @vd: virtual DMA descriptor |
b23f204c | 180 | * @dsg_list: list of children sg's |
b23f204c RK |
181 | * @llis_bus: DMA memory address (physical) start for the LLIs |
182 | * @llis_va: virtual memory address start for the LLIs | |
183 | * @cctl: control reg values for current txd | |
184 | * @ccfg: config reg values for current txd | |
18536134 RK |
185 | * @done: this marks completed descriptors, which should not have their |
186 | * mux released. | |
3b24c20b | 187 | * @cyclic: indicate cyclic transfers |
b23f204c RK |
188 | */ |
189 | struct pl08x_txd { | |
01d8dc64 | 190 | struct virt_dma_desc vd; |
b23f204c | 191 | struct list_head dsg_list; |
b23f204c | 192 | dma_addr_t llis_bus; |
ba6785ff | 193 | u32 *llis_va; |
b23f204c RK |
194 | /* Default cctl value for LLIs */ |
195 | u32 cctl; | |
196 | /* | |
197 | * Settings to be put into the physical channel when we | |
198 | * trigger this txd. Other registers are in llis_va[0]. | |
199 | */ | |
200 | u32 ccfg; | |
18536134 | 201 | bool done; |
3b24c20b | 202 | bool cyclic; |
b23f204c RK |
203 | }; |
204 | ||
205 | /** | |
206 | * struct pl08x_dma_chan_state - holds the PL08x specific virtual channel | |
207 | * states | |
208 | * @PL08X_CHAN_IDLE: the channel is idle | |
209 | * @PL08X_CHAN_RUNNING: the channel has allocated a physical transport | |
210 | * channel and is running a transfer on it | |
211 | * @PL08X_CHAN_PAUSED: the channel has allocated a physical transport | |
212 | * channel, but the transfer is currently paused | |
213 | * @PL08X_CHAN_WAITING: the channel is waiting for a physical transport | |
214 | * channel to become available (only pertains to memcpy channels) | |
215 | */ | |
216 | enum pl08x_dma_chan_state { | |
217 | PL08X_CHAN_IDLE, | |
218 | PL08X_CHAN_RUNNING, | |
219 | PL08X_CHAN_PAUSED, | |
220 | PL08X_CHAN_WAITING, | |
221 | }; | |
222 | ||
223 | /** | |
224 | * struct pl08x_dma_chan - this structure wraps a DMA ENGINE channel | |
01d8dc64 | 225 | * @vc: wrappped virtual channel |
b23f204c | 226 | * @phychan: the physical channel utilized by this channel, if there is one |
b23f204c RK |
227 | * @name: name of channel |
228 | * @cd: channel platform data | |
229 | * @runtime_addr: address for RX/TX according to the runtime config | |
b23f204c RK |
230 | * @at: active transaction on this channel |
231 | * @lock: a lock for this channel data | |
232 | * @host: a pointer to the host (internal use) | |
233 | * @state: whether the channel is idle, paused, running etc | |
234 | * @slave: whether this channel is a device (slave) or for memcpy | |
ad0de2ac | 235 | * @signal: the physical DMA request signal which this channel is using |
5e2479bd | 236 | * @mux_use: count of descriptors using this DMA request signal setting |
b23f204c RK |
237 | */ |
238 | struct pl08x_dma_chan { | |
01d8dc64 | 239 | struct virt_dma_chan vc; |
b23f204c | 240 | struct pl08x_phy_chan *phychan; |
550ec36f | 241 | const char *name; |
f9cd4761 | 242 | struct pl08x_channel_data *cd; |
ed91c13d | 243 | struct dma_slave_config cfg; |
b23f204c | 244 | struct pl08x_txd *at; |
b23f204c RK |
245 | struct pl08x_driver_data *host; |
246 | enum pl08x_dma_chan_state state; | |
247 | bool slave; | |
ad0de2ac | 248 | int signal; |
5e2479bd | 249 | unsigned mux_use; |
b23f204c RK |
250 | }; |
251 | ||
e8689e63 LW |
252 | /** |
253 | * struct pl08x_driver_data - the local state holder for the PL08x | |
254 | * @slave: slave engine for this instance | |
255 | * @memcpy: memcpy engine for this instance | |
256 | * @base: virtual memory base (remapped) for the PL08x | |
257 | * @adev: the corresponding AMBA (PrimeCell) bus entry | |
258 | * @vd: vendor data for this PL08x variant | |
259 | * @pd: platform data passed in from the platform/machine | |
260 | * @phy_chans: array of data for the physical channels | |
261 | * @pool: a pool for the LLI descriptors | |
3e27ee84 VK |
262 | * @lli_buses: bitmask to or in to LLI pointer selecting AHB port for LLI |
263 | * fetches | |
30749cb4 | 264 | * @mem_buses: set to indicate memory transfers on AHB2. |
e8689e63 LW |
265 | * @lock: a spinlock for this struct |
266 | */ | |
267 | struct pl08x_driver_data { | |
268 | struct dma_device slave; | |
269 | struct dma_device memcpy; | |
270 | void __iomem *base; | |
271 | struct amba_device *adev; | |
f96ca9ec | 272 | const struct vendor_data *vd; |
e8689e63 LW |
273 | struct pl08x_platform_data *pd; |
274 | struct pl08x_phy_chan *phy_chans; | |
275 | struct dma_pool *pool; | |
30749cb4 RKAL |
276 | u8 lli_buses; |
277 | u8 mem_buses; | |
ba6785ff | 278 | u8 lli_words; |
e8689e63 LW |
279 | }; |
280 | ||
281 | /* | |
282 | * PL08X specific defines | |
283 | */ | |
284 | ||
ba6785ff TF |
285 | /* The order of words in an LLI. */ |
286 | #define PL080_LLI_SRC 0 | |
287 | #define PL080_LLI_DST 1 | |
288 | #define PL080_LLI_LLI 2 | |
289 | #define PL080_LLI_CCTL 3 | |
da1b6c05 | 290 | #define PL080S_LLI_CCTL2 4 |
ba6785ff TF |
291 | |
292 | /* Total words in an LLI. */ | |
293 | #define PL080_LLI_WORDS 4 | |
da1b6c05 | 294 | #define PL080S_LLI_WORDS 8 |
e8689e63 | 295 | |
ba6785ff TF |
296 | /* |
297 | * Number of LLIs in each LLI buffer allocated for one transfer | |
298 | * (maximum times we call dma_pool_alloc on this pool without freeing) | |
299 | */ | |
300 | #define MAX_NUM_TSFR_LLIS 512 | |
e8689e63 LW |
301 | #define PL08X_ALIGN 8 |
302 | ||
303 | static inline struct pl08x_dma_chan *to_pl08x_chan(struct dma_chan *chan) | |
304 | { | |
01d8dc64 | 305 | return container_of(chan, struct pl08x_dma_chan, vc.chan); |
e8689e63 LW |
306 | } |
307 | ||
501e67e8 RKAL |
308 | static inline struct pl08x_txd *to_pl08x_txd(struct dma_async_tx_descriptor *tx) |
309 | { | |
01d8dc64 | 310 | return container_of(tx, struct pl08x_txd, vd.tx); |
501e67e8 RKAL |
311 | } |
312 | ||
6b16c8b1 RK |
313 | /* |
314 | * Mux handling. | |
315 | * | |
316 | * This gives us the DMA request input to the PL08x primecell which the | |
317 | * peripheral described by the channel data will be routed to, possibly | |
318 | * via a board/SoC specific external MUX. One important point to note | |
319 | * here is that this does not depend on the physical channel. | |
320 | */ | |
ad0de2ac | 321 | static int pl08x_request_mux(struct pl08x_dma_chan *plchan) |
6b16c8b1 RK |
322 | { |
323 | const struct pl08x_platform_data *pd = plchan->host->pd; | |
324 | int ret; | |
325 | ||
d7cabeed MB |
326 | if (plchan->mux_use++ == 0 && pd->get_xfer_signal) { |
327 | ret = pd->get_xfer_signal(plchan->cd); | |
5e2479bd RK |
328 | if (ret < 0) { |
329 | plchan->mux_use = 0; | |
6b16c8b1 | 330 | return ret; |
5e2479bd | 331 | } |
6b16c8b1 | 332 | |
ad0de2ac | 333 | plchan->signal = ret; |
6b16c8b1 RK |
334 | } |
335 | return 0; | |
336 | } | |
337 | ||
338 | static void pl08x_release_mux(struct pl08x_dma_chan *plchan) | |
339 | { | |
340 | const struct pl08x_platform_data *pd = plchan->host->pd; | |
341 | ||
5e2479bd RK |
342 | if (plchan->signal >= 0) { |
343 | WARN_ON(plchan->mux_use == 0); | |
344 | ||
d7cabeed MB |
345 | if (--plchan->mux_use == 0 && pd->put_xfer_signal) { |
346 | pd->put_xfer_signal(plchan->cd, plchan->signal); | |
5e2479bd RK |
347 | plchan->signal = -1; |
348 | } | |
6b16c8b1 RK |
349 | } |
350 | } | |
351 | ||
e8689e63 LW |
352 | /* |
353 | * Physical channel handling | |
354 | */ | |
355 | ||
356 | /* Whether a certain channel is busy or not */ | |
357 | static int pl08x_phy_channel_busy(struct pl08x_phy_chan *ch) | |
358 | { | |
359 | unsigned int val; | |
360 | ||
d86ccea7 | 361 | val = readl(ch->reg_config); |
e8689e63 LW |
362 | return val & PL080_CONFIG_ACTIVE; |
363 | } | |
364 | ||
ba6785ff TF |
365 | static void pl08x_write_lli(struct pl08x_driver_data *pl08x, |
366 | struct pl08x_phy_chan *phychan, const u32 *lli, u32 ccfg) | |
367 | { | |
da1b6c05 TF |
368 | if (pl08x->vd->pl080s) |
369 | dev_vdbg(&pl08x->adev->dev, | |
370 | "WRITE channel %d: csrc=0x%08x, cdst=0x%08x, " | |
371 | "clli=0x%08x, cctl=0x%08x, cctl2=0x%08x, ccfg=0x%08x\n", | |
372 | phychan->id, lli[PL080_LLI_SRC], lli[PL080_LLI_DST], | |
373 | lli[PL080_LLI_LLI], lli[PL080_LLI_CCTL], | |
374 | lli[PL080S_LLI_CCTL2], ccfg); | |
375 | else | |
376 | dev_vdbg(&pl08x->adev->dev, | |
377 | "WRITE channel %d: csrc=0x%08x, cdst=0x%08x, " | |
378 | "clli=0x%08x, cctl=0x%08x, ccfg=0x%08x\n", | |
379 | phychan->id, lli[PL080_LLI_SRC], lli[PL080_LLI_DST], | |
380 | lli[PL080_LLI_LLI], lli[PL080_LLI_CCTL], ccfg); | |
ba6785ff TF |
381 | |
382 | writel_relaxed(lli[PL080_LLI_SRC], phychan->base + PL080_CH_SRC_ADDR); | |
383 | writel_relaxed(lli[PL080_LLI_DST], phychan->base + PL080_CH_DST_ADDR); | |
384 | writel_relaxed(lli[PL080_LLI_LLI], phychan->base + PL080_CH_LLI); | |
385 | writel_relaxed(lli[PL080_LLI_CCTL], phychan->base + PL080_CH_CONTROL); | |
386 | ||
da1b6c05 TF |
387 | if (pl08x->vd->pl080s) |
388 | writel_relaxed(lli[PL080S_LLI_CCTL2], | |
389 | phychan->base + PL080S_CH_CONTROL2); | |
390 | ||
ba6785ff TF |
391 | writel(ccfg, phychan->reg_config); |
392 | } | |
393 | ||
e8689e63 LW |
394 | /* |
395 | * Set the initial DMA register values i.e. those for the first LLI | |
e8b5e11d | 396 | * The next LLI pointer and the configuration interrupt bit have |
c885bee4 RKAL |
397 | * been set when the LLIs were constructed. Poke them into the hardware |
398 | * and start the transfer. | |
e8689e63 | 399 | */ |
eab82533 | 400 | static void pl08x_start_next_txd(struct pl08x_dma_chan *plchan) |
e8689e63 | 401 | { |
c885bee4 | 402 | struct pl08x_driver_data *pl08x = plchan->host; |
e8689e63 | 403 | struct pl08x_phy_chan *phychan = plchan->phychan; |
879f127b RK |
404 | struct virt_dma_desc *vd = vchan_next_desc(&plchan->vc); |
405 | struct pl08x_txd *txd = to_pl08x_txd(&vd->tx); | |
09b3c323 | 406 | u32 val; |
c885bee4 | 407 | |
879f127b | 408 | list_del(&txd->vd.node); |
eab82533 | 409 | |
c885bee4 | 410 | plchan->at = txd; |
e8689e63 | 411 | |
c885bee4 RKAL |
412 | /* Wait for channel inactive */ |
413 | while (pl08x_phy_channel_busy(phychan)) | |
414 | cpu_relax(); | |
e8689e63 | 415 | |
ba6785ff | 416 | pl08x_write_lli(pl08x, phychan, &txd->llis_va[0], txd->ccfg); |
c885bee4 RKAL |
417 | |
418 | /* Enable the DMA channel */ | |
419 | /* Do not access config register until channel shows as disabled */ | |
420 | while (readl(pl08x->base + PL080_EN_CHAN) & (1 << phychan->id)) | |
19386b32 | 421 | cpu_relax(); |
e8689e63 | 422 | |
c885bee4 | 423 | /* Do not access config register until channel shows as inactive */ |
d86ccea7 | 424 | val = readl(phychan->reg_config); |
e8689e63 | 425 | while ((val & PL080_CONFIG_ACTIVE) || (val & PL080_CONFIG_ENABLE)) |
d86ccea7 | 426 | val = readl(phychan->reg_config); |
e8689e63 | 427 | |
d86ccea7 | 428 | writel(val | PL080_CONFIG_ENABLE, phychan->reg_config); |
e8689e63 LW |
429 | } |
430 | ||
431 | /* | |
81796616 | 432 | * Pause the channel by setting the HALT bit. |
e8689e63 | 433 | * |
81796616 RKAL |
434 | * For M->P transfers, pause the DMAC first and then stop the peripheral - |
435 | * the FIFO can only drain if the peripheral is still requesting data. | |
436 | * (note: this can still timeout if the DMAC FIFO never drains of data.) | |
e8689e63 | 437 | * |
81796616 RKAL |
438 | * For P->M transfers, disable the peripheral first to stop it filling |
439 | * the DMAC FIFO, and then pause the DMAC. | |
e8689e63 LW |
440 | */ |
441 | static void pl08x_pause_phy_chan(struct pl08x_phy_chan *ch) | |
442 | { | |
443 | u32 val; | |
81796616 | 444 | int timeout; |
e8689e63 LW |
445 | |
446 | /* Set the HALT bit and wait for the FIFO to drain */ | |
d86ccea7 | 447 | val = readl(ch->reg_config); |
e8689e63 | 448 | val |= PL080_CONFIG_HALT; |
d86ccea7 | 449 | writel(val, ch->reg_config); |
e8689e63 LW |
450 | |
451 | /* Wait for channel inactive */ | |
81796616 RKAL |
452 | for (timeout = 1000; timeout; timeout--) { |
453 | if (!pl08x_phy_channel_busy(ch)) | |
454 | break; | |
455 | udelay(1); | |
456 | } | |
457 | if (pl08x_phy_channel_busy(ch)) | |
458 | pr_err("pl08x: channel%u timeout waiting for pause\n", ch->id); | |
e8689e63 LW |
459 | } |
460 | ||
461 | static void pl08x_resume_phy_chan(struct pl08x_phy_chan *ch) | |
462 | { | |
463 | u32 val; | |
464 | ||
465 | /* Clear the HALT bit */ | |
d86ccea7 | 466 | val = readl(ch->reg_config); |
e8689e63 | 467 | val &= ~PL080_CONFIG_HALT; |
d86ccea7 | 468 | writel(val, ch->reg_config); |
e8689e63 LW |
469 | } |
470 | ||
fb526210 RKAL |
471 | /* |
472 | * pl08x_terminate_phy_chan() stops the channel, clears the FIFO and | |
473 | * clears any pending interrupt status. This should not be used for | |
474 | * an on-going transfer, but as a method of shutting down a channel | |
475 | * (eg, when it's no longer used) or terminating a transfer. | |
476 | */ | |
477 | static void pl08x_terminate_phy_chan(struct pl08x_driver_data *pl08x, | |
478 | struct pl08x_phy_chan *ch) | |
e8689e63 | 479 | { |
d86ccea7 | 480 | u32 val = readl(ch->reg_config); |
e8689e63 | 481 | |
fb526210 | 482 | val &= ~(PL080_CONFIG_ENABLE | PL080_CONFIG_ERR_IRQ_MASK | |
5835aa86 | 483 | PL080_CONFIG_TC_IRQ_MASK); |
e8689e63 | 484 | |
d86ccea7 | 485 | writel(val, ch->reg_config); |
fb526210 RKAL |
486 | |
487 | writel(1 << ch->id, pl08x->base + PL080_ERR_CLEAR); | |
488 | writel(1 << ch->id, pl08x->base + PL080_TC_CLEAR); | |
e8689e63 LW |
489 | } |
490 | ||
491 | static inline u32 get_bytes_in_cctl(u32 cctl) | |
492 | { | |
493 | /* The source width defines the number of bytes */ | |
494 | u32 bytes = cctl & PL080_CONTROL_TRANSFER_SIZE_MASK; | |
495 | ||
f3287a52 AB |
496 | cctl &= PL080_CONTROL_SWIDTH_MASK; |
497 | ||
e8689e63 LW |
498 | switch (cctl >> PL080_CONTROL_SWIDTH_SHIFT) { |
499 | case PL080_WIDTH_8BIT: | |
500 | break; | |
501 | case PL080_WIDTH_16BIT: | |
502 | bytes *= 2; | |
503 | break; | |
504 | case PL080_WIDTH_32BIT: | |
505 | bytes *= 4; | |
506 | break; | |
507 | } | |
508 | return bytes; | |
509 | } | |
510 | ||
da1b6c05 TF |
511 | static inline u32 get_bytes_in_cctl_pl080s(u32 cctl, u32 cctl1) |
512 | { | |
513 | /* The source width defines the number of bytes */ | |
514 | u32 bytes = cctl1 & PL080S_CONTROL_TRANSFER_SIZE_MASK; | |
515 | ||
f3287a52 AB |
516 | cctl &= PL080_CONTROL_SWIDTH_MASK; |
517 | ||
e8689e63 LW |
518 | switch (cctl >> PL080_CONTROL_SWIDTH_SHIFT) { |
519 | case PL080_WIDTH_8BIT: | |
520 | break; | |
521 | case PL080_WIDTH_16BIT: | |
522 | bytes *= 2; | |
523 | break; | |
524 | case PL080_WIDTH_32BIT: | |
525 | bytes *= 4; | |
526 | break; | |
527 | } | |
528 | return bytes; | |
529 | } | |
530 | ||
531 | /* The channel should be paused when calling this */ | |
532 | static u32 pl08x_getbytes_chan(struct pl08x_dma_chan *plchan) | |
533 | { | |
ba6785ff TF |
534 | struct pl08x_driver_data *pl08x = plchan->host; |
535 | const u32 *llis_va, *llis_va_limit; | |
e8689e63 | 536 | struct pl08x_phy_chan *ch; |
68a7faa2 | 537 | dma_addr_t llis_bus; |
e8689e63 | 538 | struct pl08x_txd *txd; |
ba6785ff | 539 | u32 llis_max_words; |
68a7faa2 | 540 | size_t bytes; |
68a7faa2 | 541 | u32 clli; |
e8689e63 | 542 | |
e8689e63 LW |
543 | ch = plchan->phychan; |
544 | txd = plchan->at; | |
545 | ||
68a7faa2 TF |
546 | if (!ch || !txd) |
547 | return 0; | |
548 | ||
e8689e63 | 549 | /* |
db9f136a RKAL |
550 | * Follow the LLIs to get the number of remaining |
551 | * bytes in the currently active transaction. | |
e8689e63 | 552 | */ |
68a7faa2 | 553 | clli = readl(ch->base + PL080_CH_LLI) & ~PL080_LLI_LM_AHB2; |
e8689e63 | 554 | |
68a7faa2 | 555 | /* First get the remaining bytes in the active transfer */ |
da1b6c05 TF |
556 | if (pl08x->vd->pl080s) |
557 | bytes = get_bytes_in_cctl_pl080s( | |
558 | readl(ch->base + PL080_CH_CONTROL), | |
559 | readl(ch->base + PL080S_CH_CONTROL2)); | |
560 | else | |
e8689e63 LW |
561 | bytes = get_bytes_in_cctl(readl(ch->base + PL080_CH_CONTROL)); |
562 | ||
68a7faa2 TF |
563 | if (!clli) |
564 | return bytes; | |
db9f136a | 565 | |
68a7faa2 TF |
566 | llis_va = txd->llis_va; |
567 | llis_bus = txd->llis_bus; | |
e8689e63 | 568 | |
ba6785ff | 569 | llis_max_words = pl08x->lli_words * MAX_NUM_TSFR_LLIS; |
68a7faa2 | 570 | BUG_ON(clli < llis_bus || clli >= llis_bus + |
ba6785ff | 571 | sizeof(u32) * llis_max_words); |
db9f136a | 572 | |
68a7faa2 TF |
573 | /* |
574 | * Locate the next LLI - as this is an array, | |
575 | * it's simple maths to find. | |
576 | */ | |
ba6785ff | 577 | llis_va += (clli - llis_bus) / sizeof(u32); |
e8689e63 | 578 | |
ba6785ff TF |
579 | llis_va_limit = llis_va + llis_max_words; |
580 | ||
581 | for (; llis_va < llis_va_limit; llis_va += pl08x->lli_words) { | |
da1b6c05 TF |
582 | if (pl08x->vd->pl080s) |
583 | bytes += get_bytes_in_cctl_pl080s( | |
584 | llis_va[PL080_LLI_CCTL], | |
585 | llis_va[PL080S_LLI_CCTL2]); | |
586 | else | |
587 | bytes += get_bytes_in_cctl(llis_va[PL080_LLI_CCTL]); | |
68a7faa2 TF |
588 | |
589 | /* | |
3b24c20b | 590 | * A LLI pointer going backward terminates the LLI list |
68a7faa2 | 591 | */ |
3b24c20b | 592 | if (llis_va[PL080_LLI_LLI] <= clli) |
68a7faa2 | 593 | break; |
e8689e63 LW |
594 | } |
595 | ||
e8689e63 LW |
596 | return bytes; |
597 | } | |
598 | ||
599 | /* | |
600 | * Allocate a physical channel for a virtual channel | |
94ae8522 RKAL |
601 | * |
602 | * Try to locate a physical channel to be used for this transfer. If all | |
603 | * are taken return NULL and the requester will have to cope by using | |
604 | * some fallback PIO mode or retrying later. | |
e8689e63 LW |
605 | */ |
606 | static struct pl08x_phy_chan * | |
607 | pl08x_get_phy_channel(struct pl08x_driver_data *pl08x, | |
608 | struct pl08x_dma_chan *virt_chan) | |
609 | { | |
610 | struct pl08x_phy_chan *ch = NULL; | |
611 | unsigned long flags; | |
612 | int i; | |
613 | ||
e8689e63 LW |
614 | for (i = 0; i < pl08x->vd->channels; i++) { |
615 | ch = &pl08x->phy_chans[i]; | |
616 | ||
617 | spin_lock_irqsave(&ch->lock, flags); | |
618 | ||
affa115e | 619 | if (!ch->locked && !ch->serving) { |
e8689e63 | 620 | ch->serving = virt_chan; |
e8689e63 LW |
621 | spin_unlock_irqrestore(&ch->lock, flags); |
622 | break; | |
623 | } | |
624 | ||
625 | spin_unlock_irqrestore(&ch->lock, flags); | |
626 | } | |
627 | ||
628 | if (i == pl08x->vd->channels) { | |
629 | /* No physical channel available, cope with it */ | |
630 | return NULL; | |
631 | } | |
632 | ||
633 | return ch; | |
634 | } | |
635 | ||
a5a488db | 636 | /* Mark the physical channel as free. Note, this write is atomic. */ |
e8689e63 LW |
637 | static inline void pl08x_put_phy_channel(struct pl08x_driver_data *pl08x, |
638 | struct pl08x_phy_chan *ch) | |
639 | { | |
a5a488db RK |
640 | ch->serving = NULL; |
641 | } | |
e8689e63 | 642 | |
a5a488db RK |
643 | /* |
644 | * Try to allocate a physical channel. When successful, assign it to | |
645 | * this virtual channel, and initiate the next descriptor. The | |
646 | * virtual channel lock must be held at this point. | |
647 | */ | |
648 | static void pl08x_phy_alloc_and_start(struct pl08x_dma_chan *plchan) | |
649 | { | |
650 | struct pl08x_driver_data *pl08x = plchan->host; | |
651 | struct pl08x_phy_chan *ch; | |
fb526210 | 652 | |
a5a488db RK |
653 | ch = pl08x_get_phy_channel(pl08x, plchan); |
654 | if (!ch) { | |
655 | dev_dbg(&pl08x->adev->dev, "no physical channel available for xfer on %s\n", plchan->name); | |
656 | plchan->state = PL08X_CHAN_WAITING; | |
657 | return; | |
658 | } | |
e8689e63 | 659 | |
a5a488db RK |
660 | dev_dbg(&pl08x->adev->dev, "allocated physical channel %d for xfer on %s\n", |
661 | ch->id, plchan->name); | |
662 | ||
663 | plchan->phychan = ch; | |
664 | plchan->state = PL08X_CHAN_RUNNING; | |
665 | pl08x_start_next_txd(plchan); | |
666 | } | |
667 | ||
668 | static void pl08x_phy_reassign_start(struct pl08x_phy_chan *ch, | |
669 | struct pl08x_dma_chan *plchan) | |
670 | { | |
671 | struct pl08x_driver_data *pl08x = plchan->host; | |
672 | ||
673 | dev_dbg(&pl08x->adev->dev, "reassigned physical channel %d for xfer on %s\n", | |
674 | ch->id, plchan->name); | |
675 | ||
676 | /* | |
677 | * We do this without taking the lock; we're really only concerned | |
678 | * about whether this pointer is NULL or not, and we're guaranteed | |
679 | * that this will only be called when it _already_ is non-NULL. | |
680 | */ | |
681 | ch->serving = plchan; | |
682 | plchan->phychan = ch; | |
683 | plchan->state = PL08X_CHAN_RUNNING; | |
684 | pl08x_start_next_txd(plchan); | |
685 | } | |
686 | ||
687 | /* | |
688 | * Free a physical DMA channel, potentially reallocating it to another | |
689 | * virtual channel if we have any pending. | |
690 | */ | |
691 | static void pl08x_phy_free(struct pl08x_dma_chan *plchan) | |
692 | { | |
693 | struct pl08x_driver_data *pl08x = plchan->host; | |
694 | struct pl08x_dma_chan *p, *next; | |
695 | ||
696 | retry: | |
697 | next = NULL; | |
698 | ||
699 | /* Find a waiting virtual channel for the next transfer. */ | |
01d8dc64 | 700 | list_for_each_entry(p, &pl08x->memcpy.channels, vc.chan.device_node) |
a5a488db RK |
701 | if (p->state == PL08X_CHAN_WAITING) { |
702 | next = p; | |
703 | break; | |
704 | } | |
705 | ||
706 | if (!next) { | |
01d8dc64 | 707 | list_for_each_entry(p, &pl08x->slave.channels, vc.chan.device_node) |
a5a488db RK |
708 | if (p->state == PL08X_CHAN_WAITING) { |
709 | next = p; | |
710 | break; | |
711 | } | |
712 | } | |
713 | ||
714 | /* Ensure that the physical channel is stopped */ | |
715 | pl08x_terminate_phy_chan(pl08x, plchan->phychan); | |
716 | ||
717 | if (next) { | |
718 | bool success; | |
719 | ||
720 | /* | |
721 | * Eww. We know this isn't going to deadlock | |
722 | * but lockdep probably doesn't. | |
723 | */ | |
083be28a | 724 | spin_lock(&next->vc.lock); |
a5a488db RK |
725 | /* Re-check the state now that we have the lock */ |
726 | success = next->state == PL08X_CHAN_WAITING; | |
727 | if (success) | |
728 | pl08x_phy_reassign_start(plchan->phychan, next); | |
083be28a | 729 | spin_unlock(&next->vc.lock); |
a5a488db RK |
730 | |
731 | /* If the state changed, try to find another channel */ | |
732 | if (!success) | |
733 | goto retry; | |
734 | } else { | |
735 | /* No more jobs, so free up the physical channel */ | |
736 | pl08x_put_phy_channel(pl08x, plchan->phychan); | |
737 | } | |
738 | ||
739 | plchan->phychan = NULL; | |
740 | plchan->state = PL08X_CHAN_IDLE; | |
e8689e63 LW |
741 | } |
742 | ||
743 | /* | |
744 | * LLI handling | |
745 | */ | |
746 | ||
747 | static inline unsigned int pl08x_get_bytes_for_cctl(unsigned int coded) | |
748 | { | |
749 | switch (coded) { | |
750 | case PL080_WIDTH_8BIT: | |
751 | return 1; | |
752 | case PL080_WIDTH_16BIT: | |
753 | return 2; | |
754 | case PL080_WIDTH_32BIT: | |
755 | return 4; | |
756 | default: | |
757 | break; | |
758 | } | |
759 | BUG(); | |
760 | return 0; | |
761 | } | |
762 | ||
763 | static inline u32 pl08x_cctl_bits(u32 cctl, u8 srcwidth, u8 dstwidth, | |
cace6585 | 764 | size_t tsize) |
e8689e63 LW |
765 | { |
766 | u32 retbits = cctl; | |
767 | ||
e8b5e11d | 768 | /* Remove all src, dst and transfer size bits */ |
e8689e63 LW |
769 | retbits &= ~PL080_CONTROL_DWIDTH_MASK; |
770 | retbits &= ~PL080_CONTROL_SWIDTH_MASK; | |
771 | retbits &= ~PL080_CONTROL_TRANSFER_SIZE_MASK; | |
772 | ||
773 | /* Then set the bits according to the parameters */ | |
774 | switch (srcwidth) { | |
775 | case 1: | |
776 | retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_SWIDTH_SHIFT; | |
777 | break; | |
778 | case 2: | |
779 | retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_SWIDTH_SHIFT; | |
780 | break; | |
781 | case 4: | |
782 | retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_SWIDTH_SHIFT; | |
783 | break; | |
784 | default: | |
785 | BUG(); | |
786 | break; | |
787 | } | |
788 | ||
789 | switch (dstwidth) { | |
790 | case 1: | |
791 | retbits |= PL080_WIDTH_8BIT << PL080_CONTROL_DWIDTH_SHIFT; | |
792 | break; | |
793 | case 2: | |
794 | retbits |= PL080_WIDTH_16BIT << PL080_CONTROL_DWIDTH_SHIFT; | |
795 | break; | |
796 | case 4: | |
797 | retbits |= PL080_WIDTH_32BIT << PL080_CONTROL_DWIDTH_SHIFT; | |
798 | break; | |
799 | default: | |
800 | BUG(); | |
801 | break; | |
802 | } | |
803 | ||
5110e51d | 804 | tsize &= PL080_CONTROL_TRANSFER_SIZE_MASK; |
e8689e63 LW |
805 | retbits |= tsize << PL080_CONTROL_TRANSFER_SIZE_SHIFT; |
806 | return retbits; | |
807 | } | |
808 | ||
542361f8 RKAL |
809 | struct pl08x_lli_build_data { |
810 | struct pl08x_txd *txd; | |
542361f8 RKAL |
811 | struct pl08x_bus_data srcbus; |
812 | struct pl08x_bus_data dstbus; | |
813 | size_t remainder; | |
25c94f7f | 814 | u32 lli_bus; |
542361f8 RKAL |
815 | }; |
816 | ||
e8689e63 | 817 | /* |
0532e6fc VK |
818 | * Autoselect a master bus to use for the transfer. Slave will be the chosen as |
819 | * victim in case src & dest are not similarly aligned. i.e. If after aligning | |
820 | * masters address with width requirements of transfer (by sending few byte by | |
821 | * byte data), slave is still not aligned, then its width will be reduced to | |
822 | * BYTE. | |
823 | * - prefers the destination bus if both available | |
036f05fd | 824 | * - prefers bus with fixed address (i.e. peripheral) |
e8689e63 | 825 | */ |
542361f8 RKAL |
826 | static void pl08x_choose_master_bus(struct pl08x_lli_build_data *bd, |
827 | struct pl08x_bus_data **mbus, struct pl08x_bus_data **sbus, u32 cctl) | |
e8689e63 LW |
828 | { |
829 | if (!(cctl & PL080_CONTROL_DST_INCR)) { | |
542361f8 RKAL |
830 | *mbus = &bd->dstbus; |
831 | *sbus = &bd->srcbus; | |
036f05fd VK |
832 | } else if (!(cctl & PL080_CONTROL_SRC_INCR)) { |
833 | *mbus = &bd->srcbus; | |
834 | *sbus = &bd->dstbus; | |
e8689e63 | 835 | } else { |
036f05fd | 836 | if (bd->dstbus.buswidth >= bd->srcbus.buswidth) { |
542361f8 RKAL |
837 | *mbus = &bd->dstbus; |
838 | *sbus = &bd->srcbus; | |
036f05fd | 839 | } else { |
542361f8 RKAL |
840 | *mbus = &bd->srcbus; |
841 | *sbus = &bd->dstbus; | |
e8689e63 LW |
842 | } |
843 | } | |
844 | } | |
845 | ||
846 | /* | |
94ae8522 | 847 | * Fills in one LLI for a certain transfer descriptor and advance the counter |
e8689e63 | 848 | */ |
ba6785ff TF |
849 | static void pl08x_fill_lli_for_desc(struct pl08x_driver_data *pl08x, |
850 | struct pl08x_lli_build_data *bd, | |
da1b6c05 | 851 | int num_llis, int len, u32 cctl, u32 cctl2) |
e8689e63 | 852 | { |
ba6785ff TF |
853 | u32 offset = num_llis * pl08x->lli_words; |
854 | u32 *llis_va = bd->txd->llis_va + offset; | |
542361f8 | 855 | dma_addr_t llis_bus = bd->txd->llis_bus; |
e8689e63 LW |
856 | |
857 | BUG_ON(num_llis >= MAX_NUM_TSFR_LLIS); | |
858 | ||
ba6785ff TF |
859 | /* Advance the offset to next LLI. */ |
860 | offset += pl08x->lli_words; | |
861 | ||
862 | llis_va[PL080_LLI_SRC] = bd->srcbus.addr; | |
863 | llis_va[PL080_LLI_DST] = bd->dstbus.addr; | |
864 | llis_va[PL080_LLI_LLI] = (llis_bus + sizeof(u32) * offset); | |
865 | llis_va[PL080_LLI_LLI] |= bd->lli_bus; | |
866 | llis_va[PL080_LLI_CCTL] = cctl; | |
da1b6c05 TF |
867 | if (pl08x->vd->pl080s) |
868 | llis_va[PL080S_LLI_CCTL2] = cctl2; | |
e8689e63 LW |
869 | |
870 | if (cctl & PL080_CONTROL_SRC_INCR) | |
542361f8 | 871 | bd->srcbus.addr += len; |
e8689e63 | 872 | if (cctl & PL080_CONTROL_DST_INCR) |
542361f8 | 873 | bd->dstbus.addr += len; |
e8689e63 | 874 | |
542361f8 | 875 | BUG_ON(bd->remainder < len); |
cace6585 | 876 | |
542361f8 | 877 | bd->remainder -= len; |
e8689e63 LW |
878 | } |
879 | ||
ba6785ff TF |
880 | static inline void prep_byte_width_lli(struct pl08x_driver_data *pl08x, |
881 | struct pl08x_lli_build_data *bd, u32 *cctl, u32 len, | |
882 | int num_llis, size_t *total_bytes) | |
e8689e63 | 883 | { |
03af500f | 884 | *cctl = pl08x_cctl_bits(*cctl, 1, 1, len); |
da1b6c05 | 885 | pl08x_fill_lli_for_desc(pl08x, bd, num_llis, len, *cctl, len); |
03af500f | 886 | (*total_bytes) += len; |
e8689e63 LW |
887 | } |
888 | ||
48924e42 TF |
889 | #ifdef VERBOSE_DEBUG |
890 | static void pl08x_dump_lli(struct pl08x_driver_data *pl08x, | |
891 | const u32 *llis_va, int num_llis) | |
892 | { | |
893 | int i; | |
894 | ||
da1b6c05 | 895 | if (pl08x->vd->pl080s) { |
48924e42 | 896 | dev_vdbg(&pl08x->adev->dev, |
da1b6c05 TF |
897 | "%-3s %-9s %-10s %-10s %-10s %-10s %s\n", |
898 | "lli", "", "csrc", "cdst", "clli", "cctl", "cctl2"); | |
899 | for (i = 0; i < num_llis; i++) { | |
900 | dev_vdbg(&pl08x->adev->dev, | |
901 | "%3d @%p: 0x%08x 0x%08x 0x%08x 0x%08x 0x%08x\n", | |
902 | i, llis_va, llis_va[PL080_LLI_SRC], | |
903 | llis_va[PL080_LLI_DST], llis_va[PL080_LLI_LLI], | |
904 | llis_va[PL080_LLI_CCTL], | |
905 | llis_va[PL080S_LLI_CCTL2]); | |
906 | llis_va += pl08x->lli_words; | |
907 | } | |
908 | } else { | |
909 | dev_vdbg(&pl08x->adev->dev, | |
910 | "%-3s %-9s %-10s %-10s %-10s %s\n", | |
911 | "lli", "", "csrc", "cdst", "clli", "cctl"); | |
912 | for (i = 0; i < num_llis; i++) { | |
913 | dev_vdbg(&pl08x->adev->dev, | |
914 | "%3d @%p: 0x%08x 0x%08x 0x%08x 0x%08x\n", | |
915 | i, llis_va, llis_va[PL080_LLI_SRC], | |
916 | llis_va[PL080_LLI_DST], llis_va[PL080_LLI_LLI], | |
917 | llis_va[PL080_LLI_CCTL]); | |
918 | llis_va += pl08x->lli_words; | |
919 | } | |
48924e42 TF |
920 | } |
921 | } | |
922 | #else | |
923 | static inline void pl08x_dump_lli(struct pl08x_driver_data *pl08x, | |
924 | const u32 *llis_va, int num_llis) {} | |
925 | #endif | |
926 | ||
e8689e63 LW |
927 | /* |
928 | * This fills in the table of LLIs for the transfer descriptor | |
929 | * Note that we assume we never have to change the burst sizes | |
930 | * Return 0 for error | |
931 | */ | |
932 | static int pl08x_fill_llis_for_desc(struct pl08x_driver_data *pl08x, | |
933 | struct pl08x_txd *txd) | |
934 | { | |
e8689e63 | 935 | struct pl08x_bus_data *mbus, *sbus; |
542361f8 | 936 | struct pl08x_lli_build_data bd; |
e8689e63 | 937 | int num_llis = 0; |
03af500f | 938 | u32 cctl, early_bytes = 0; |
b7f69d9d | 939 | size_t max_bytes_per_lli, total_bytes; |
ba6785ff | 940 | u32 *llis_va, *last_lli; |
b7f69d9d | 941 | struct pl08x_sg *dsg; |
e8689e63 | 942 | |
3e27ee84 | 943 | txd->llis_va = dma_pool_alloc(pl08x->pool, GFP_NOWAIT, &txd->llis_bus); |
e8689e63 LW |
944 | if (!txd->llis_va) { |
945 | dev_err(&pl08x->adev->dev, "%s no memory for llis\n", __func__); | |
946 | return 0; | |
947 | } | |
948 | ||
542361f8 | 949 | bd.txd = txd; |
25c94f7f | 950 | bd.lli_bus = (pl08x->lli_buses & PL08X_AHB2) ? PL080_LLI_LM_AHB2 : 0; |
b7f69d9d | 951 | cctl = txd->cctl; |
542361f8 | 952 | |
e8689e63 | 953 | /* Find maximum width of the source bus */ |
542361f8 | 954 | bd.srcbus.maxwidth = |
e8689e63 LW |
955 | pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_SWIDTH_MASK) >> |
956 | PL080_CONTROL_SWIDTH_SHIFT); | |
957 | ||
958 | /* Find maximum width of the destination bus */ | |
542361f8 | 959 | bd.dstbus.maxwidth = |
e8689e63 LW |
960 | pl08x_get_bytes_for_cctl((cctl & PL080_CONTROL_DWIDTH_MASK) >> |
961 | PL080_CONTROL_DWIDTH_SHIFT); | |
962 | ||
b7f69d9d VK |
963 | list_for_each_entry(dsg, &txd->dsg_list, node) { |
964 | total_bytes = 0; | |
965 | cctl = txd->cctl; | |
e8689e63 | 966 | |
b7f69d9d VK |
967 | bd.srcbus.addr = dsg->src_addr; |
968 | bd.dstbus.addr = dsg->dst_addr; | |
969 | bd.remainder = dsg->len; | |
970 | bd.srcbus.buswidth = bd.srcbus.maxwidth; | |
971 | bd.dstbus.buswidth = bd.dstbus.maxwidth; | |
e8689e63 | 972 | |
b7f69d9d | 973 | pl08x_choose_master_bus(&bd, &mbus, &sbus, cctl); |
e8689e63 | 974 | |
b90ca063 AP |
975 | dev_vdbg(&pl08x->adev->dev, |
976 | "src=0x%08llx%s/%u dst=0x%08llx%s/%u len=%zu\n", | |
977 | (u64)bd.srcbus.addr, | |
978 | cctl & PL080_CONTROL_SRC_INCR ? "+" : "", | |
b7f69d9d | 979 | bd.srcbus.buswidth, |
b90ca063 AP |
980 | (u64)bd.dstbus.addr, |
981 | cctl & PL080_CONTROL_DST_INCR ? "+" : "", | |
b7f69d9d VK |
982 | bd.dstbus.buswidth, |
983 | bd.remainder); | |
984 | dev_vdbg(&pl08x->adev->dev, "mbus=%s sbus=%s\n", | |
985 | mbus == &bd.srcbus ? "src" : "dst", | |
986 | sbus == &bd.srcbus ? "src" : "dst"); | |
fc74eb79 | 987 | |
b7f69d9d VK |
988 | /* |
989 | * Zero length is only allowed if all these requirements are | |
990 | * met: | |
991 | * - flow controller is peripheral. | |
992 | * - src.addr is aligned to src.width | |
993 | * - dst.addr is aligned to dst.width | |
994 | * | |
995 | * sg_len == 1 should be true, as there can be two cases here: | |
996 | * | |
997 | * - Memory addresses are contiguous and are not scattered. | |
998 | * Here, Only one sg will be passed by user driver, with | |
999 | * memory address and zero length. We pass this to controller | |
1000 | * and after the transfer it will receive the last burst | |
1001 | * request from peripheral and so transfer finishes. | |
1002 | * | |
1003 | * - Memory addresses are scattered and are not contiguous. | |
1004 | * Here, Obviously as DMA controller doesn't know when a lli's | |
1005 | * transfer gets over, it can't load next lli. So in this | |
1006 | * case, there has to be an assumption that only one lli is | |
1007 | * supported. Thus, we can't have scattered addresses. | |
1008 | */ | |
1009 | if (!bd.remainder) { | |
1010 | u32 fc = (txd->ccfg & PL080_CONFIG_FLOW_CONTROL_MASK) >> | |
1011 | PL080_CONFIG_FLOW_CONTROL_SHIFT; | |
1012 | if (!((fc >= PL080_FLOW_SRC2DST_DST) && | |
0a235657 | 1013 | (fc <= PL080_FLOW_SRC2DST_SRC))) { |
b7f69d9d VK |
1014 | dev_err(&pl08x->adev->dev, "%s sg len can't be zero", |
1015 | __func__); | |
1016 | return 0; | |
1017 | } | |
0a235657 | 1018 | |
1c38b289 AP |
1019 | if (!IS_BUS_ALIGNED(&bd.srcbus) || |
1020 | !IS_BUS_ALIGNED(&bd.dstbus)) { | |
b7f69d9d VK |
1021 | dev_err(&pl08x->adev->dev, |
1022 | "%s src & dst address must be aligned to src" | |
1023 | " & dst width if peripheral is flow controller", | |
1024 | __func__); | |
1025 | return 0; | |
1026 | } | |
03af500f | 1027 | |
b7f69d9d VK |
1028 | cctl = pl08x_cctl_bits(cctl, bd.srcbus.buswidth, |
1029 | bd.dstbus.buswidth, 0); | |
ba6785ff | 1030 | pl08x_fill_lli_for_desc(pl08x, &bd, num_llis++, |
da1b6c05 | 1031 | 0, cctl, 0); |
b7f69d9d VK |
1032 | break; |
1033 | } | |
e8689e63 LW |
1034 | |
1035 | /* | |
b7f69d9d VK |
1036 | * Send byte by byte for following cases |
1037 | * - Less than a bus width available | |
1038 | * - until master bus is aligned | |
e8689e63 | 1039 | */ |
b7f69d9d VK |
1040 | if (bd.remainder < mbus->buswidth) |
1041 | early_bytes = bd.remainder; | |
1c38b289 AP |
1042 | else if (!IS_BUS_ALIGNED(mbus)) { |
1043 | early_bytes = mbus->buswidth - | |
1044 | (mbus->addr & (mbus->buswidth - 1)); | |
b7f69d9d VK |
1045 | if ((bd.remainder - early_bytes) < mbus->buswidth) |
1046 | early_bytes = bd.remainder; | |
1047 | } | |
e8689e63 | 1048 | |
b7f69d9d VK |
1049 | if (early_bytes) { |
1050 | dev_vdbg(&pl08x->adev->dev, | |
6fc8ae78 | 1051 | "%s byte width LLIs (remain 0x%08zx)\n", |
b7f69d9d | 1052 | __func__, bd.remainder); |
ba6785ff TF |
1053 | prep_byte_width_lli(pl08x, &bd, &cctl, early_bytes, |
1054 | num_llis++, &total_bytes); | |
e8689e63 LW |
1055 | } |
1056 | ||
b7f69d9d VK |
1057 | if (bd.remainder) { |
1058 | /* | |
1059 | * Master now aligned | |
1060 | * - if slave is not then we must set its width down | |
1061 | */ | |
1c38b289 | 1062 | if (!IS_BUS_ALIGNED(sbus)) { |
b7f69d9d VK |
1063 | dev_dbg(&pl08x->adev->dev, |
1064 | "%s set down bus width to one byte\n", | |
1065 | __func__); | |
fa6a940b | 1066 | |
b7f69d9d VK |
1067 | sbus->buswidth = 1; |
1068 | } | |
e8689e63 LW |
1069 | |
1070 | /* | |
b7f69d9d VK |
1071 | * Bytes transferred = tsize * src width, not |
1072 | * MIN(buswidths) | |
e8689e63 | 1073 | */ |
b7f69d9d | 1074 | max_bytes_per_lli = bd.srcbus.buswidth * |
5110e51d | 1075 | pl08x->vd->max_transfer_size; |
b7f69d9d VK |
1076 | dev_vdbg(&pl08x->adev->dev, |
1077 | "%s max bytes per lli = %zu\n", | |
1078 | __func__, max_bytes_per_lli); | |
e8689e63 LW |
1079 | |
1080 | /* | |
b7f69d9d VK |
1081 | * Make largest possible LLIs until less than one bus |
1082 | * width left | |
e8689e63 | 1083 | */ |
b7f69d9d VK |
1084 | while (bd.remainder > (mbus->buswidth - 1)) { |
1085 | size_t lli_len, tsize, width; | |
e8689e63 | 1086 | |
b7f69d9d VK |
1087 | /* |
1088 | * If enough left try to send max possible, | |
1089 | * otherwise try to send the remainder | |
1090 | */ | |
1091 | lli_len = min(bd.remainder, max_bytes_per_lli); | |
16a2e7d3 | 1092 | |
b7f69d9d VK |
1093 | /* |
1094 | * Check against maximum bus alignment: | |
1095 | * Calculate actual transfer size in relation to | |
1096 | * bus width an get a maximum remainder of the | |
1097 | * highest bus width - 1 | |
1098 | */ | |
1099 | width = max(mbus->buswidth, sbus->buswidth); | |
1100 | lli_len = (lli_len / width) * width; | |
1101 | tsize = lli_len / bd.srcbus.buswidth; | |
1102 | ||
1103 | dev_vdbg(&pl08x->adev->dev, | |
1104 | "%s fill lli with single lli chunk of " | |
1105 | "size 0x%08zx (remainder 0x%08zx)\n", | |
1106 | __func__, lli_len, bd.remainder); | |
1107 | ||
1108 | cctl = pl08x_cctl_bits(cctl, bd.srcbus.buswidth, | |
16a2e7d3 | 1109 | bd.dstbus.buswidth, tsize); |
ba6785ff | 1110 | pl08x_fill_lli_for_desc(pl08x, &bd, num_llis++, |
da1b6c05 | 1111 | lli_len, cctl, tsize); |
b7f69d9d VK |
1112 | total_bytes += lli_len; |
1113 | } | |
e8689e63 | 1114 | |
b7f69d9d VK |
1115 | /* |
1116 | * Send any odd bytes | |
1117 | */ | |
1118 | if (bd.remainder) { | |
1119 | dev_vdbg(&pl08x->adev->dev, | |
1120 | "%s align with boundary, send odd bytes (remain %zu)\n", | |
1121 | __func__, bd.remainder); | |
ba6785ff TF |
1122 | prep_byte_width_lli(pl08x, &bd, &cctl, |
1123 | bd.remainder, num_llis++, &total_bytes); | |
b7f69d9d | 1124 | } |
e8689e63 | 1125 | } |
16a2e7d3 | 1126 | |
b7f69d9d VK |
1127 | if (total_bytes != dsg->len) { |
1128 | dev_err(&pl08x->adev->dev, | |
1129 | "%s size of encoded lli:s don't match total txd, transferred 0x%08zx from size 0x%08zx\n", | |
1130 | __func__, total_bytes, dsg->len); | |
1131 | return 0; | |
1132 | } | |
e8689e63 | 1133 | |
b7f69d9d VK |
1134 | if (num_llis >= MAX_NUM_TSFR_LLIS) { |
1135 | dev_err(&pl08x->adev->dev, | |
1136 | "%s need to increase MAX_NUM_TSFR_LLIS from 0x%08x\n", | |
ba6785ff | 1137 | __func__, MAX_NUM_TSFR_LLIS); |
b7f69d9d VK |
1138 | return 0; |
1139 | } | |
e8689e63 | 1140 | } |
b58b6b5b RKAL |
1141 | |
1142 | llis_va = txd->llis_va; | |
ba6785ff | 1143 | last_lli = llis_va + (num_llis - 1) * pl08x->lli_words; |
e8689e63 | 1144 | |
3b24c20b AB |
1145 | if (txd->cyclic) { |
1146 | /* Link back to the first LLI. */ | |
1147 | last_lli[PL080_LLI_LLI] = txd->llis_bus | bd.lli_bus; | |
1148 | } else { | |
1149 | /* The final LLI terminates the LLI. */ | |
1150 | last_lli[PL080_LLI_LLI] = 0; | |
1151 | /* The final LLI element shall also fire an interrupt. */ | |
1152 | last_lli[PL080_LLI_CCTL] |= PL080_CONTROL_TC_IRQ_EN; | |
e8689e63 | 1153 | } |
e8689e63 | 1154 | |
48924e42 | 1155 | pl08x_dump_lli(pl08x, llis_va, num_llis); |
e8689e63 LW |
1156 | |
1157 | return num_llis; | |
1158 | } | |
1159 | ||
e8689e63 LW |
1160 | static void pl08x_free_txd(struct pl08x_driver_data *pl08x, |
1161 | struct pl08x_txd *txd) | |
1162 | { | |
b7f69d9d VK |
1163 | struct pl08x_sg *dsg, *_dsg; |
1164 | ||
c1205646 VK |
1165 | if (txd->llis_va) |
1166 | dma_pool_free(pl08x->pool, txd->llis_va, txd->llis_bus); | |
e8689e63 | 1167 | |
b7f69d9d VK |
1168 | list_for_each_entry_safe(dsg, _dsg, &txd->dsg_list, node) { |
1169 | list_del(&dsg->node); | |
1170 | kfree(dsg); | |
1171 | } | |
1172 | ||
e8689e63 LW |
1173 | kfree(txd); |
1174 | } | |
1175 | ||
18536134 RK |
1176 | static void pl08x_desc_free(struct virt_dma_desc *vd) |
1177 | { | |
1178 | struct pl08x_txd *txd = to_pl08x_txd(&vd->tx); | |
1179 | struct pl08x_dma_chan *plchan = to_pl08x_chan(vd->tx.chan); | |
18536134 | 1180 | |
89116bf9 | 1181 | dma_descriptor_unmap(&vd->tx); |
18536134 RK |
1182 | if (!txd->done) |
1183 | pl08x_release_mux(plchan); | |
1184 | ||
18536134 | 1185 | pl08x_free_txd(plchan->host, txd); |
18536134 RK |
1186 | } |
1187 | ||
e8689e63 LW |
1188 | static void pl08x_free_txd_list(struct pl08x_driver_data *pl08x, |
1189 | struct pl08x_dma_chan *plchan) | |
1190 | { | |
ea160561 | 1191 | LIST_HEAD(head); |
e8689e63 | 1192 | |
879f127b | 1193 | vchan_get_all_descriptors(&plchan->vc, &head); |
91998261 | 1194 | vchan_dma_desc_free_list(&plchan->vc, &head); |
e8689e63 LW |
1195 | } |
1196 | ||
1197 | /* | |
1198 | * The DMA ENGINE API | |
1199 | */ | |
e8689e63 LW |
1200 | static void pl08x_free_chan_resources(struct dma_chan *chan) |
1201 | { | |
a068682c RK |
1202 | /* Ensure all queued descriptors are freed */ |
1203 | vchan_free_chan_resources(to_virt_chan(chan)); | |
e8689e63 LW |
1204 | } |
1205 | ||
e8689e63 LW |
1206 | static struct dma_async_tx_descriptor *pl08x_prep_dma_interrupt( |
1207 | struct dma_chan *chan, unsigned long flags) | |
1208 | { | |
1209 | struct dma_async_tx_descriptor *retval = NULL; | |
1210 | ||
1211 | return retval; | |
1212 | } | |
1213 | ||
1214 | /* | |
94ae8522 RKAL |
1215 | * Code accessing dma_async_is_complete() in a tight loop may give problems. |
1216 | * If slaves are relying on interrupts to signal completion this function | |
1217 | * must not be called with interrupts disabled. | |
e8689e63 | 1218 | */ |
3e27ee84 VK |
1219 | static enum dma_status pl08x_dma_tx_status(struct dma_chan *chan, |
1220 | dma_cookie_t cookie, struct dma_tx_state *txstate) | |
e8689e63 LW |
1221 | { |
1222 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
06e885b7 RK |
1223 | struct virt_dma_desc *vd; |
1224 | unsigned long flags; | |
e8689e63 | 1225 | enum dma_status ret; |
06e885b7 | 1226 | size_t bytes = 0; |
e8689e63 | 1227 | |
96a2af41 | 1228 | ret = dma_cookie_status(chan, cookie, txstate); |
0996e895 | 1229 | if (ret == DMA_COMPLETE) |
e8689e63 | 1230 | return ret; |
e8689e63 | 1231 | |
06e885b7 RK |
1232 | /* |
1233 | * There's no point calculating the residue if there's | |
1234 | * no txstate to store the value. | |
1235 | */ | |
1236 | if (!txstate) { | |
1237 | if (plchan->state == PL08X_CHAN_PAUSED) | |
1238 | ret = DMA_PAUSED; | |
1239 | return ret; | |
1240 | } | |
1241 | ||
1242 | spin_lock_irqsave(&plchan->vc.lock, flags); | |
1243 | ret = dma_cookie_status(chan, cookie, txstate); | |
0996e895 | 1244 | if (ret != DMA_COMPLETE) { |
06e885b7 RK |
1245 | vd = vchan_find_desc(&plchan->vc, cookie); |
1246 | if (vd) { | |
1247 | /* On the issued list, so hasn't been processed yet */ | |
1248 | struct pl08x_txd *txd = to_pl08x_txd(&vd->tx); | |
1249 | struct pl08x_sg *dsg; | |
1250 | ||
1251 | list_for_each_entry(dsg, &txd->dsg_list, node) | |
1252 | bytes += dsg->len; | |
1253 | } else { | |
1254 | bytes = pl08x_getbytes_chan(plchan); | |
1255 | } | |
1256 | } | |
1257 | spin_unlock_irqrestore(&plchan->vc.lock, flags); | |
1258 | ||
e8689e63 LW |
1259 | /* |
1260 | * This cookie not complete yet | |
96a2af41 | 1261 | * Get number of bytes left in the active transactions and queue |
e8689e63 | 1262 | */ |
06e885b7 | 1263 | dma_set_residue(txstate, bytes); |
e8689e63 | 1264 | |
06e885b7 RK |
1265 | if (plchan->state == PL08X_CHAN_PAUSED && ret == DMA_IN_PROGRESS) |
1266 | ret = DMA_PAUSED; | |
e8689e63 LW |
1267 | |
1268 | /* Whether waiting or running, we're in progress */ | |
06e885b7 | 1269 | return ret; |
e8689e63 LW |
1270 | } |
1271 | ||
1272 | /* PrimeCell DMA extension */ | |
1273 | struct burst_table { | |
760596c6 | 1274 | u32 burstwords; |
e8689e63 LW |
1275 | u32 reg; |
1276 | }; | |
1277 | ||
1278 | static const struct burst_table burst_sizes[] = { | |
1279 | { | |
1280 | .burstwords = 256, | |
760596c6 | 1281 | .reg = PL080_BSIZE_256, |
e8689e63 LW |
1282 | }, |
1283 | { | |
1284 | .burstwords = 128, | |
760596c6 | 1285 | .reg = PL080_BSIZE_128, |
e8689e63 LW |
1286 | }, |
1287 | { | |
1288 | .burstwords = 64, | |
760596c6 | 1289 | .reg = PL080_BSIZE_64, |
e8689e63 LW |
1290 | }, |
1291 | { | |
1292 | .burstwords = 32, | |
760596c6 | 1293 | .reg = PL080_BSIZE_32, |
e8689e63 LW |
1294 | }, |
1295 | { | |
1296 | .burstwords = 16, | |
760596c6 | 1297 | .reg = PL080_BSIZE_16, |
e8689e63 LW |
1298 | }, |
1299 | { | |
1300 | .burstwords = 8, | |
760596c6 | 1301 | .reg = PL080_BSIZE_8, |
e8689e63 LW |
1302 | }, |
1303 | { | |
1304 | .burstwords = 4, | |
760596c6 | 1305 | .reg = PL080_BSIZE_4, |
e8689e63 LW |
1306 | }, |
1307 | { | |
760596c6 RKAL |
1308 | .burstwords = 0, |
1309 | .reg = PL080_BSIZE_1, | |
e8689e63 LW |
1310 | }, |
1311 | }; | |
1312 | ||
121c8476 RKAL |
1313 | /* |
1314 | * Given the source and destination available bus masks, select which | |
1315 | * will be routed to each port. We try to have source and destination | |
1316 | * on separate ports, but always respect the allowable settings. | |
1317 | */ | |
1318 | static u32 pl08x_select_bus(u8 src, u8 dst) | |
1319 | { | |
1320 | u32 cctl = 0; | |
1321 | ||
1322 | if (!(dst & PL08X_AHB1) || ((dst & PL08X_AHB2) && (src & PL08X_AHB1))) | |
1323 | cctl |= PL080_CONTROL_DST_AHB2; | |
1324 | if (!(src & PL08X_AHB1) || ((src & PL08X_AHB2) && !(dst & PL08X_AHB2))) | |
1325 | cctl |= PL080_CONTROL_SRC_AHB2; | |
1326 | ||
1327 | return cctl; | |
1328 | } | |
1329 | ||
f14c426c RKAL |
1330 | static u32 pl08x_cctl(u32 cctl) |
1331 | { | |
1332 | cctl &= ~(PL080_CONTROL_SRC_AHB2 | PL080_CONTROL_DST_AHB2 | | |
1333 | PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR | | |
1334 | PL080_CONTROL_PROT_MASK); | |
1335 | ||
1336 | /* Access the cell in privileged mode, non-bufferable, non-cacheable */ | |
1337 | return cctl | PL080_CONTROL_PROT_SYS; | |
1338 | } | |
1339 | ||
aa88cdaa RKAL |
1340 | static u32 pl08x_width(enum dma_slave_buswidth width) |
1341 | { | |
1342 | switch (width) { | |
1343 | case DMA_SLAVE_BUSWIDTH_1_BYTE: | |
1344 | return PL080_WIDTH_8BIT; | |
1345 | case DMA_SLAVE_BUSWIDTH_2_BYTES: | |
1346 | return PL080_WIDTH_16BIT; | |
1347 | case DMA_SLAVE_BUSWIDTH_4_BYTES: | |
1348 | return PL080_WIDTH_32BIT; | |
f32807f1 VK |
1349 | default: |
1350 | return ~0; | |
aa88cdaa | 1351 | } |
aa88cdaa RKAL |
1352 | } |
1353 | ||
760596c6 RKAL |
1354 | static u32 pl08x_burst(u32 maxburst) |
1355 | { | |
1356 | int i; | |
1357 | ||
1358 | for (i = 0; i < ARRAY_SIZE(burst_sizes); i++) | |
1359 | if (burst_sizes[i].burstwords <= maxburst) | |
1360 | break; | |
1361 | ||
1362 | return burst_sizes[i].reg; | |
1363 | } | |
1364 | ||
9862ba17 RK |
1365 | static u32 pl08x_get_cctl(struct pl08x_dma_chan *plchan, |
1366 | enum dma_slave_buswidth addr_width, u32 maxburst) | |
1367 | { | |
1368 | u32 width, burst, cctl = 0; | |
1369 | ||
1370 | width = pl08x_width(addr_width); | |
1371 | if (width == ~0) | |
1372 | return ~0; | |
1373 | ||
1374 | cctl |= width << PL080_CONTROL_SWIDTH_SHIFT; | |
1375 | cctl |= width << PL080_CONTROL_DWIDTH_SHIFT; | |
1376 | ||
1377 | /* | |
1378 | * If this channel will only request single transfers, set this | |
1379 | * down to ONE element. Also select one element if no maxburst | |
1380 | * is specified. | |
1381 | */ | |
1382 | if (plchan->cd->single) | |
1383 | maxburst = 1; | |
1384 | ||
1385 | burst = pl08x_burst(maxburst); | |
1386 | cctl |= burst << PL080_CONTROL_SB_SIZE_SHIFT; | |
1387 | cctl |= burst << PL080_CONTROL_DB_SIZE_SHIFT; | |
1388 | ||
1389 | return pl08x_cctl(cctl); | |
1390 | } | |
1391 | ||
e8689e63 LW |
1392 | /* |
1393 | * Slave transactions callback to the slave device to allow | |
1394 | * synchronization of slave DMA signals with the DMAC enable | |
1395 | */ | |
1396 | static void pl08x_issue_pending(struct dma_chan *chan) | |
1397 | { | |
1398 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
e8689e63 LW |
1399 | unsigned long flags; |
1400 | ||
083be28a | 1401 | spin_lock_irqsave(&plchan->vc.lock, flags); |
879f127b | 1402 | if (vchan_issue_pending(&plchan->vc)) { |
a5a488db RK |
1403 | if (!plchan->phychan && plchan->state != PL08X_CHAN_WAITING) |
1404 | pl08x_phy_alloc_and_start(plchan); | |
e8689e63 | 1405 | } |
083be28a | 1406 | spin_unlock_irqrestore(&plchan->vc.lock, flags); |
e8689e63 LW |
1407 | } |
1408 | ||
879f127b | 1409 | static struct pl08x_txd *pl08x_get_txd(struct pl08x_dma_chan *plchan) |
ac3cd20d | 1410 | { |
b201c111 | 1411 | struct pl08x_txd *txd = kzalloc(sizeof(*txd), GFP_NOWAIT); |
ac3cd20d RKAL |
1412 | |
1413 | if (txd) { | |
b7f69d9d | 1414 | INIT_LIST_HEAD(&txd->dsg_list); |
4983a04f RKAL |
1415 | |
1416 | /* Always enable error and terminal interrupts */ | |
1417 | txd->ccfg = PL080_CONFIG_ERR_IRQ_MASK | | |
1418 | PL080_CONFIG_TC_IRQ_MASK; | |
ac3cd20d RKAL |
1419 | } |
1420 | return txd; | |
1421 | } | |
1422 | ||
e8689e63 LW |
1423 | /* |
1424 | * Initialize a descriptor to be used by memcpy submit | |
1425 | */ | |
1426 | static struct dma_async_tx_descriptor *pl08x_prep_dma_memcpy( | |
1427 | struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, | |
1428 | size_t len, unsigned long flags) | |
1429 | { | |
1430 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1431 | struct pl08x_driver_data *pl08x = plchan->host; | |
1432 | struct pl08x_txd *txd; | |
b7f69d9d | 1433 | struct pl08x_sg *dsg; |
e8689e63 LW |
1434 | int ret; |
1435 | ||
879f127b | 1436 | txd = pl08x_get_txd(plchan); |
e8689e63 LW |
1437 | if (!txd) { |
1438 | dev_err(&pl08x->adev->dev, | |
1439 | "%s no memory for descriptor\n", __func__); | |
1440 | return NULL; | |
1441 | } | |
1442 | ||
b7f69d9d VK |
1443 | dsg = kzalloc(sizeof(struct pl08x_sg), GFP_NOWAIT); |
1444 | if (!dsg) { | |
1445 | pl08x_free_txd(pl08x, txd); | |
1446 | dev_err(&pl08x->adev->dev, "%s no memory for pl080 sg\n", | |
1447 | __func__); | |
1448 | return NULL; | |
1449 | } | |
1450 | list_add_tail(&dsg->node, &txd->dsg_list); | |
1451 | ||
b7f69d9d VK |
1452 | dsg->src_addr = src; |
1453 | dsg->dst_addr = dest; | |
1454 | dsg->len = len; | |
e8689e63 LW |
1455 | |
1456 | /* Set platform data for m2m */ | |
4983a04f | 1457 | txd->ccfg |= PL080_FLOW_MEM2MEM << PL080_CONFIG_FLOW_CONTROL_SHIFT; |
dc8d5f8d | 1458 | txd->cctl = pl08x->pd->memcpy_channel.cctl_memcpy & |
c7da9a56 | 1459 | ~(PL080_CONTROL_DST_AHB2 | PL080_CONTROL_SRC_AHB2); |
4983a04f | 1460 | |
e8689e63 | 1461 | /* Both to be incremented or the code will break */ |
70b5ed6b | 1462 | txd->cctl |= PL080_CONTROL_SRC_INCR | PL080_CONTROL_DST_INCR; |
c7da9a56 | 1463 | |
c7da9a56 | 1464 | if (pl08x->vd->dualmaster) |
121c8476 RKAL |
1465 | txd->cctl |= pl08x_select_bus(pl08x->mem_buses, |
1466 | pl08x->mem_buses); | |
e8689e63 | 1467 | |
aa4afb75 RK |
1468 | ret = pl08x_fill_llis_for_desc(plchan->host, txd); |
1469 | if (!ret) { | |
1470 | pl08x_free_txd(pl08x, txd); | |
e8689e63 | 1471 | return NULL; |
aa4afb75 | 1472 | } |
e8689e63 | 1473 | |
879f127b | 1474 | return vchan_tx_prep(&plchan->vc, &txd->vd, flags); |
e8689e63 LW |
1475 | } |
1476 | ||
3b24c20b AB |
1477 | static struct pl08x_txd *pl08x_init_txd( |
1478 | struct dma_chan *chan, | |
1479 | enum dma_transfer_direction direction, | |
1480 | dma_addr_t *slave_addr) | |
e8689e63 LW |
1481 | { |
1482 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1483 | struct pl08x_driver_data *pl08x = plchan->host; | |
1484 | struct pl08x_txd *txd; | |
dc8d5f8d | 1485 | enum dma_slave_buswidth addr_width; |
0a235657 | 1486 | int ret, tmp; |
409ec8db | 1487 | u8 src_buses, dst_buses; |
dc8d5f8d | 1488 | u32 maxburst, cctl; |
e8689e63 | 1489 | |
879f127b | 1490 | txd = pl08x_get_txd(plchan); |
e8689e63 LW |
1491 | if (!txd) { |
1492 | dev_err(&pl08x->adev->dev, "%s no txd\n", __func__); | |
1493 | return NULL; | |
1494 | } | |
1495 | ||
e8689e63 LW |
1496 | /* |
1497 | * Set up addresses, the PrimeCell configured address | |
1498 | * will take precedence since this may configure the | |
1499 | * channel target address dynamically at runtime. | |
1500 | */ | |
db8196df | 1501 | if (direction == DMA_MEM_TO_DEV) { |
dc8d5f8d | 1502 | cctl = PL080_CONTROL_SRC_INCR; |
3b24c20b | 1503 | *slave_addr = plchan->cfg.dst_addr; |
dc8d5f8d RK |
1504 | addr_width = plchan->cfg.dst_addr_width; |
1505 | maxburst = plchan->cfg.dst_maxburst; | |
409ec8db RK |
1506 | src_buses = pl08x->mem_buses; |
1507 | dst_buses = plchan->cd->periph_buses; | |
db8196df | 1508 | } else if (direction == DMA_DEV_TO_MEM) { |
dc8d5f8d | 1509 | cctl = PL080_CONTROL_DST_INCR; |
3b24c20b | 1510 | *slave_addr = plchan->cfg.src_addr; |
dc8d5f8d RK |
1511 | addr_width = plchan->cfg.src_addr_width; |
1512 | maxburst = plchan->cfg.src_maxburst; | |
409ec8db RK |
1513 | src_buses = plchan->cd->periph_buses; |
1514 | dst_buses = pl08x->mem_buses; | |
e8689e63 | 1515 | } else { |
b7f69d9d | 1516 | pl08x_free_txd(pl08x, txd); |
e8689e63 LW |
1517 | dev_err(&pl08x->adev->dev, |
1518 | "%s direction unsupported\n", __func__); | |
1519 | return NULL; | |
1520 | } | |
e8689e63 | 1521 | |
dc8d5f8d | 1522 | cctl |= pl08x_get_cctl(plchan, addr_width, maxburst); |
800d683e RK |
1523 | if (cctl == ~0) { |
1524 | pl08x_free_txd(pl08x, txd); | |
1525 | dev_err(&pl08x->adev->dev, | |
1526 | "DMA slave configuration botched?\n"); | |
1527 | return NULL; | |
1528 | } | |
1529 | ||
409ec8db RK |
1530 | txd->cctl = cctl | pl08x_select_bus(src_buses, dst_buses); |
1531 | ||
95442b22 | 1532 | if (plchan->cfg.device_fc) |
db8196df | 1533 | tmp = (direction == DMA_MEM_TO_DEV) ? PL080_FLOW_MEM2PER_PER : |
0a235657 VK |
1534 | PL080_FLOW_PER2MEM_PER; |
1535 | else | |
db8196df | 1536 | tmp = (direction == DMA_MEM_TO_DEV) ? PL080_FLOW_MEM2PER : |
0a235657 VK |
1537 | PL080_FLOW_PER2MEM; |
1538 | ||
1539 | txd->ccfg |= tmp << PL080_CONFIG_FLOW_CONTROL_SHIFT; | |
1540 | ||
c48d4963 RK |
1541 | ret = pl08x_request_mux(plchan); |
1542 | if (ret < 0) { | |
1543 | pl08x_free_txd(pl08x, txd); | |
1544 | dev_dbg(&pl08x->adev->dev, | |
1545 | "unable to mux for transfer on %s due to platform restrictions\n", | |
1546 | plchan->name); | |
1547 | return NULL; | |
1548 | } | |
1549 | ||
1550 | dev_dbg(&pl08x->adev->dev, "allocated DMA request signal %d for xfer on %s\n", | |
1551 | plchan->signal, plchan->name); | |
1552 | ||
1553 | /* Assign the flow control signal to this channel */ | |
1554 | if (direction == DMA_MEM_TO_DEV) | |
1555 | txd->ccfg |= plchan->signal << PL080_CONFIG_DST_SEL_SHIFT; | |
1556 | else | |
1557 | txd->ccfg |= plchan->signal << PL080_CONFIG_SRC_SEL_SHIFT; | |
1558 | ||
3b24c20b AB |
1559 | return txd; |
1560 | } | |
1561 | ||
1562 | static int pl08x_tx_add_sg(struct pl08x_txd *txd, | |
1563 | enum dma_transfer_direction direction, | |
1564 | dma_addr_t slave_addr, | |
1565 | dma_addr_t buf_addr, | |
1566 | unsigned int len) | |
1567 | { | |
1568 | struct pl08x_sg *dsg; | |
1569 | ||
1570 | dsg = kzalloc(sizeof(struct pl08x_sg), GFP_NOWAIT); | |
1571 | if (!dsg) | |
1572 | return -ENOMEM; | |
1573 | ||
1574 | list_add_tail(&dsg->node, &txd->dsg_list); | |
1575 | ||
1576 | dsg->len = len; | |
1577 | if (direction == DMA_MEM_TO_DEV) { | |
1578 | dsg->src_addr = buf_addr; | |
1579 | dsg->dst_addr = slave_addr; | |
1580 | } else { | |
1581 | dsg->src_addr = slave_addr; | |
1582 | dsg->dst_addr = buf_addr; | |
1583 | } | |
1584 | ||
1585 | return 0; | |
1586 | } | |
1587 | ||
1588 | static struct dma_async_tx_descriptor *pl08x_prep_slave_sg( | |
1589 | struct dma_chan *chan, struct scatterlist *sgl, | |
1590 | unsigned int sg_len, enum dma_transfer_direction direction, | |
1591 | unsigned long flags, void *context) | |
1592 | { | |
1593 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1594 | struct pl08x_driver_data *pl08x = plchan->host; | |
1595 | struct pl08x_txd *txd; | |
1596 | struct scatterlist *sg; | |
1597 | int ret, tmp; | |
1598 | dma_addr_t slave_addr; | |
1599 | ||
1600 | dev_dbg(&pl08x->adev->dev, "%s prepare transaction of %d bytes from %s\n", | |
1601 | __func__, sg_dma_len(sgl), plchan->name); | |
1602 | ||
1603 | txd = pl08x_init_txd(chan, direction, &slave_addr); | |
1604 | if (!txd) | |
1605 | return NULL; | |
1606 | ||
b7f69d9d | 1607 | for_each_sg(sgl, sg, sg_len, tmp) { |
3b24c20b AB |
1608 | ret = pl08x_tx_add_sg(txd, direction, slave_addr, |
1609 | sg_dma_address(sg), | |
1610 | sg_dma_len(sg)); | |
1611 | if (ret) { | |
c48d4963 | 1612 | pl08x_release_mux(plchan); |
b7f69d9d VK |
1613 | pl08x_free_txd(pl08x, txd); |
1614 | dev_err(&pl08x->adev->dev, "%s no mem for pl080 sg\n", | |
1615 | __func__); | |
1616 | return NULL; | |
1617 | } | |
3b24c20b | 1618 | } |
b7f69d9d | 1619 | |
3b24c20b AB |
1620 | ret = pl08x_fill_llis_for_desc(plchan->host, txd); |
1621 | if (!ret) { | |
1622 | pl08x_release_mux(plchan); | |
1623 | pl08x_free_txd(pl08x, txd); | |
1624 | return NULL; | |
1625 | } | |
1626 | ||
1627 | return vchan_tx_prep(&plchan->vc, &txd->vd, flags); | |
1628 | } | |
1629 | ||
1630 | static struct dma_async_tx_descriptor *pl08x_prep_dma_cyclic( | |
1631 | struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len, | |
1632 | size_t period_len, enum dma_transfer_direction direction, | |
31c1e5a1 | 1633 | unsigned long flags) |
3b24c20b AB |
1634 | { |
1635 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1636 | struct pl08x_driver_data *pl08x = plchan->host; | |
1637 | struct pl08x_txd *txd; | |
1638 | int ret, tmp; | |
1639 | dma_addr_t slave_addr; | |
1640 | ||
1641 | dev_dbg(&pl08x->adev->dev, | |
6fc8ae78 | 1642 | "%s prepare cyclic transaction of %zd/%zd bytes %s %s\n", |
3b24c20b AB |
1643 | __func__, period_len, buf_len, |
1644 | direction == DMA_MEM_TO_DEV ? "to" : "from", | |
1645 | plchan->name); | |
1646 | ||
1647 | txd = pl08x_init_txd(chan, direction, &slave_addr); | |
1648 | if (!txd) | |
1649 | return NULL; | |
1650 | ||
1651 | txd->cyclic = true; | |
1652 | txd->cctl |= PL080_CONTROL_TC_IRQ_EN; | |
1653 | for (tmp = 0; tmp < buf_len; tmp += period_len) { | |
1654 | ret = pl08x_tx_add_sg(txd, direction, slave_addr, | |
1655 | buf_addr + tmp, period_len); | |
1656 | if (ret) { | |
1657 | pl08x_release_mux(plchan); | |
1658 | pl08x_free_txd(pl08x, txd); | |
1659 | return NULL; | |
b7f69d9d VK |
1660 | } |
1661 | } | |
1662 | ||
aa4afb75 RK |
1663 | ret = pl08x_fill_llis_for_desc(plchan->host, txd); |
1664 | if (!ret) { | |
1665 | pl08x_release_mux(plchan); | |
1666 | pl08x_free_txd(pl08x, txd); | |
e8689e63 | 1667 | return NULL; |
aa4afb75 | 1668 | } |
e8689e63 | 1669 | |
879f127b | 1670 | return vchan_tx_prep(&plchan->vc, &txd->vd, flags); |
e8689e63 LW |
1671 | } |
1672 | ||
bcd1b0b9 MR |
1673 | static int pl08x_config(struct dma_chan *chan, |
1674 | struct dma_slave_config *config) | |
1675 | { | |
1676 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1677 | struct pl08x_driver_data *pl08x = plchan->host; | |
1678 | ||
1679 | if (!plchan->slave) | |
1680 | return -EINVAL; | |
1681 | ||
1682 | /* Reject definitely invalid configurations */ | |
1683 | if (config->src_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES || | |
1684 | config->dst_addr_width == DMA_SLAVE_BUSWIDTH_8_BYTES) | |
1685 | return -EINVAL; | |
1686 | ||
1687 | if (config->device_fc && pl08x->vd->pl080s) { | |
1688 | dev_err(&pl08x->adev->dev, | |
1689 | "%s: PL080S does not support peripheral flow control\n", | |
1690 | __func__); | |
1691 | return -EINVAL; | |
1692 | } | |
1693 | ||
1694 | plchan->cfg = *config; | |
1695 | ||
1696 | return 0; | |
1697 | } | |
1698 | ||
1699 | static int pl08x_terminate_all(struct dma_chan *chan) | |
e8689e63 LW |
1700 | { |
1701 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1702 | struct pl08x_driver_data *pl08x = plchan->host; | |
1703 | unsigned long flags; | |
e8689e63 | 1704 | |
bcd1b0b9 MR |
1705 | spin_lock_irqsave(&plchan->vc.lock, flags); |
1706 | if (!plchan->phychan && !plchan->at) { | |
1707 | spin_unlock_irqrestore(&plchan->vc.lock, flags); | |
1708 | return 0; | |
e8689e63 LW |
1709 | } |
1710 | ||
bcd1b0b9 MR |
1711 | plchan->state = PL08X_CHAN_IDLE; |
1712 | ||
1713 | if (plchan->phychan) { | |
1714 | /* | |
1715 | * Mark physical channel as free and free any slave | |
1716 | * signal | |
1717 | */ | |
1718 | pl08x_phy_free(plchan); | |
1719 | } | |
1720 | /* Dequeue jobs and free LLIs */ | |
1721 | if (plchan->at) { | |
1722 | pl08x_desc_free(&plchan->at->vd); | |
1723 | plchan->at = NULL; | |
1724 | } | |
1725 | /* Dequeue jobs not yet fired as well */ | |
1726 | pl08x_free_txd_list(pl08x, plchan); | |
1727 | ||
1728 | spin_unlock_irqrestore(&plchan->vc.lock, flags); | |
1729 | ||
1730 | return 0; | |
1731 | } | |
1732 | ||
1733 | static int pl08x_pause(struct dma_chan *chan) | |
1734 | { | |
1735 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1736 | unsigned long flags; | |
1737 | ||
e8689e63 LW |
1738 | /* |
1739 | * Anything succeeds on channels with no physical allocation and | |
1740 | * no queued transfers. | |
1741 | */ | |
083be28a | 1742 | spin_lock_irqsave(&plchan->vc.lock, flags); |
e8689e63 | 1743 | if (!plchan->phychan && !plchan->at) { |
083be28a | 1744 | spin_unlock_irqrestore(&plchan->vc.lock, flags); |
e8689e63 LW |
1745 | return 0; |
1746 | } | |
1747 | ||
bcd1b0b9 MR |
1748 | pl08x_pause_phy_chan(plchan->phychan); |
1749 | plchan->state = PL08X_CHAN_PAUSED; | |
e8689e63 | 1750 | |
bcd1b0b9 MR |
1751 | spin_unlock_irqrestore(&plchan->vc.lock, flags); |
1752 | ||
1753 | return 0; | |
1754 | } | |
1755 | ||
1756 | static int pl08x_resume(struct dma_chan *chan) | |
1757 | { | |
1758 | struct pl08x_dma_chan *plchan = to_pl08x_chan(chan); | |
1759 | unsigned long flags; | |
1760 | ||
1761 | /* | |
1762 | * Anything succeeds on channels with no physical allocation and | |
1763 | * no queued transfers. | |
1764 | */ | |
1765 | spin_lock_irqsave(&plchan->vc.lock, flags); | |
1766 | if (!plchan->phychan && !plchan->at) { | |
1767 | spin_unlock_irqrestore(&plchan->vc.lock, flags); | |
1768 | return 0; | |
e8689e63 LW |
1769 | } |
1770 | ||
bcd1b0b9 MR |
1771 | pl08x_resume_phy_chan(plchan->phychan); |
1772 | plchan->state = PL08X_CHAN_RUNNING; | |
1773 | ||
083be28a | 1774 | spin_unlock_irqrestore(&plchan->vc.lock, flags); |
e8689e63 | 1775 | |
bcd1b0b9 | 1776 | return 0; |
e8689e63 LW |
1777 | } |
1778 | ||
1779 | bool pl08x_filter_id(struct dma_chan *chan, void *chan_id) | |
1780 | { | |
7703eac9 | 1781 | struct pl08x_dma_chan *plchan; |
e8689e63 LW |
1782 | char *name = chan_id; |
1783 | ||
7703eac9 RKAL |
1784 | /* Reject channels for devices not bound to this driver */ |
1785 | if (chan->device->dev->driver != &pl08x_amba_driver.drv) | |
1786 | return false; | |
1787 | ||
1788 | plchan = to_pl08x_chan(chan); | |
1789 | ||
e8689e63 LW |
1790 | /* Check that the channel is not taken! */ |
1791 | if (!strcmp(plchan->name, name)) | |
1792 | return true; | |
1793 | ||
1794 | return false; | |
1795 | } | |
6d05c9fa | 1796 | EXPORT_SYMBOL_GPL(pl08x_filter_id); |
e8689e63 LW |
1797 | |
1798 | /* | |
1799 | * Just check that the device is there and active | |
94ae8522 RKAL |
1800 | * TODO: turn this bit on/off depending on the number of physical channels |
1801 | * actually used, if it is zero... well shut it off. That will save some | |
1802 | * power. Cut the clock at the same time. | |
e8689e63 LW |
1803 | */ |
1804 | static void pl08x_ensure_on(struct pl08x_driver_data *pl08x) | |
1805 | { | |
affa115e LW |
1806 | /* The Nomadik variant does not have the config register */ |
1807 | if (pl08x->vd->nomadik) | |
1808 | return; | |
48a59ef3 | 1809 | writel(PL080_CONFIG_ENABLE, pl08x->base + PL080_CONFIG); |
e8689e63 LW |
1810 | } |
1811 | ||
e8689e63 LW |
1812 | static irqreturn_t pl08x_irq(int irq, void *dev) |
1813 | { | |
1814 | struct pl08x_driver_data *pl08x = dev; | |
28da2836 VK |
1815 | u32 mask = 0, err, tc, i; |
1816 | ||
1817 | /* check & clear - ERR & TC interrupts */ | |
1818 | err = readl(pl08x->base + PL080_ERR_STATUS); | |
1819 | if (err) { | |
1820 | dev_err(&pl08x->adev->dev, "%s error interrupt, register value 0x%08x\n", | |
1821 | __func__, err); | |
1822 | writel(err, pl08x->base + PL080_ERR_CLEAR); | |
e8689e63 | 1823 | } |
d29bf019 | 1824 | tc = readl(pl08x->base + PL080_TC_STATUS); |
28da2836 VK |
1825 | if (tc) |
1826 | writel(tc, pl08x->base + PL080_TC_CLEAR); | |
1827 | ||
1828 | if (!err && !tc) | |
1829 | return IRQ_NONE; | |
1830 | ||
e8689e63 | 1831 | for (i = 0; i < pl08x->vd->channels; i++) { |
28da2836 | 1832 | if (((1 << i) & err) || ((1 << i) & tc)) { |
e8689e63 LW |
1833 | /* Locate physical channel */ |
1834 | struct pl08x_phy_chan *phychan = &pl08x->phy_chans[i]; | |
1835 | struct pl08x_dma_chan *plchan = phychan->serving; | |
a936e793 | 1836 | struct pl08x_txd *tx; |
e8689e63 | 1837 | |
28da2836 VK |
1838 | if (!plchan) { |
1839 | dev_err(&pl08x->adev->dev, | |
1840 | "%s Error TC interrupt on unused channel: 0x%08x\n", | |
1841 | __func__, i); | |
1842 | continue; | |
1843 | } | |
1844 | ||
083be28a | 1845 | spin_lock(&plchan->vc.lock); |
a936e793 | 1846 | tx = plchan->at; |
3b24c20b AB |
1847 | if (tx && tx->cyclic) { |
1848 | vchan_cyclic_callback(&tx->vd); | |
1849 | } else if (tx) { | |
a936e793 | 1850 | plchan->at = NULL; |
c48d4963 RK |
1851 | /* |
1852 | * This descriptor is done, release its mux | |
1853 | * reservation. | |
1854 | */ | |
1855 | pl08x_release_mux(plchan); | |
18536134 RK |
1856 | tx->done = true; |
1857 | vchan_cookie_complete(&tx->vd); | |
c33b644c | 1858 | |
a5a488db RK |
1859 | /* |
1860 | * And start the next descriptor (if any), | |
1861 | * otherwise free this channel. | |
1862 | */ | |
879f127b | 1863 | if (vchan_next_desc(&plchan->vc)) |
c33b644c | 1864 | pl08x_start_next_txd(plchan); |
a5a488db RK |
1865 | else |
1866 | pl08x_phy_free(plchan); | |
a936e793 | 1867 | } |
083be28a | 1868 | spin_unlock(&plchan->vc.lock); |
a936e793 | 1869 | |
e8689e63 LW |
1870 | mask |= (1 << i); |
1871 | } | |
1872 | } | |
e8689e63 LW |
1873 | |
1874 | return mask ? IRQ_HANDLED : IRQ_NONE; | |
1875 | } | |
1876 | ||
121c8476 RKAL |
1877 | static void pl08x_dma_slave_init(struct pl08x_dma_chan *chan) |
1878 | { | |
121c8476 RKAL |
1879 | chan->slave = true; |
1880 | chan->name = chan->cd->bus_id; | |
ed91c13d RK |
1881 | chan->cfg.src_addr = chan->cd->addr; |
1882 | chan->cfg.dst_addr = chan->cd->addr; | |
121c8476 RKAL |
1883 | } |
1884 | ||
e8689e63 LW |
1885 | /* |
1886 | * Initialise the DMAC memcpy/slave channels. | |
1887 | * Make a local wrapper to hold required data | |
1888 | */ | |
1889 | static int pl08x_dma_init_virtual_channels(struct pl08x_driver_data *pl08x, | |
3e27ee84 | 1890 | struct dma_device *dmadev, unsigned int channels, bool slave) |
e8689e63 LW |
1891 | { |
1892 | struct pl08x_dma_chan *chan; | |
1893 | int i; | |
1894 | ||
1895 | INIT_LIST_HEAD(&dmadev->channels); | |
94ae8522 | 1896 | |
e8689e63 LW |
1897 | /* |
1898 | * Register as many many memcpy as we have physical channels, | |
1899 | * we won't always be able to use all but the code will have | |
1900 | * to cope with that situation. | |
1901 | */ | |
1902 | for (i = 0; i < channels; i++) { | |
b201c111 | 1903 | chan = kzalloc(sizeof(*chan), GFP_KERNEL); |
e8689e63 LW |
1904 | if (!chan) { |
1905 | dev_err(&pl08x->adev->dev, | |
1906 | "%s no memory for channel\n", __func__); | |
1907 | return -ENOMEM; | |
1908 | } | |
1909 | ||
1910 | chan->host = pl08x; | |
1911 | chan->state = PL08X_CHAN_IDLE; | |
ad0de2ac | 1912 | chan->signal = -1; |
e8689e63 LW |
1913 | |
1914 | if (slave) { | |
e8689e63 | 1915 | chan->cd = &pl08x->pd->slave_channels[i]; |
f9cd4761 LW |
1916 | /* |
1917 | * Some implementations have muxed signals, whereas some | |
1918 | * use a mux in front of the signals and need dynamic | |
1919 | * assignment of signals. | |
1920 | */ | |
1921 | chan->signal = i; | |
121c8476 | 1922 | pl08x_dma_slave_init(chan); |
e8689e63 LW |
1923 | } else { |
1924 | chan->cd = &pl08x->pd->memcpy_channel; | |
1925 | chan->name = kasprintf(GFP_KERNEL, "memcpy%d", i); | |
1926 | if (!chan->name) { | |
1927 | kfree(chan); | |
1928 | return -ENOMEM; | |
1929 | } | |
1930 | } | |
175a5e61 | 1931 | dev_dbg(&pl08x->adev->dev, |
e8689e63 LW |
1932 | "initialize virtual channel \"%s\"\n", |
1933 | chan->name); | |
1934 | ||
18536134 | 1935 | chan->vc.desc_free = pl08x_desc_free; |
083be28a | 1936 | vchan_init(&chan->vc, dmadev); |
e8689e63 LW |
1937 | } |
1938 | dev_info(&pl08x->adev->dev, "initialized %d virtual %s channels\n", | |
1939 | i, slave ? "slave" : "memcpy"); | |
1940 | return i; | |
1941 | } | |
1942 | ||
1943 | static void pl08x_free_virtual_channels(struct dma_device *dmadev) | |
1944 | { | |
1945 | struct pl08x_dma_chan *chan = NULL; | |
1946 | struct pl08x_dma_chan *next; | |
1947 | ||
1948 | list_for_each_entry_safe(chan, | |
01d8dc64 RK |
1949 | next, &dmadev->channels, vc.chan.device_node) { |
1950 | list_del(&chan->vc.chan.device_node); | |
e8689e63 LW |
1951 | kfree(chan); |
1952 | } | |
1953 | } | |
1954 | ||
1955 | #ifdef CONFIG_DEBUG_FS | |
1956 | static const char *pl08x_state_str(enum pl08x_dma_chan_state state) | |
1957 | { | |
1958 | switch (state) { | |
1959 | case PL08X_CHAN_IDLE: | |
1960 | return "idle"; | |
1961 | case PL08X_CHAN_RUNNING: | |
1962 | return "running"; | |
1963 | case PL08X_CHAN_PAUSED: | |
1964 | return "paused"; | |
1965 | case PL08X_CHAN_WAITING: | |
1966 | return "waiting"; | |
1967 | default: | |
1968 | break; | |
1969 | } | |
1970 | return "UNKNOWN STATE"; | |
1971 | } | |
1972 | ||
1973 | static int pl08x_debugfs_show(struct seq_file *s, void *data) | |
1974 | { | |
1975 | struct pl08x_driver_data *pl08x = s->private; | |
1976 | struct pl08x_dma_chan *chan; | |
1977 | struct pl08x_phy_chan *ch; | |
1978 | unsigned long flags; | |
1979 | int i; | |
1980 | ||
1981 | seq_printf(s, "PL08x physical channels:\n"); | |
1982 | seq_printf(s, "CHANNEL:\tUSER:\n"); | |
1983 | seq_printf(s, "--------\t-----\n"); | |
1984 | for (i = 0; i < pl08x->vd->channels; i++) { | |
1985 | struct pl08x_dma_chan *virt_chan; | |
1986 | ||
1987 | ch = &pl08x->phy_chans[i]; | |
1988 | ||
1989 | spin_lock_irqsave(&ch->lock, flags); | |
1990 | virt_chan = ch->serving; | |
1991 | ||
affa115e LW |
1992 | seq_printf(s, "%d\t\t%s%s\n", |
1993 | ch->id, | |
1994 | virt_chan ? virt_chan->name : "(none)", | |
1995 | ch->locked ? " LOCKED" : ""); | |
e8689e63 LW |
1996 | |
1997 | spin_unlock_irqrestore(&ch->lock, flags); | |
1998 | } | |
1999 | ||
2000 | seq_printf(s, "\nPL08x virtual memcpy channels:\n"); | |
2001 | seq_printf(s, "CHANNEL:\tSTATE:\n"); | |
2002 | seq_printf(s, "--------\t------\n"); | |
01d8dc64 | 2003 | list_for_each_entry(chan, &pl08x->memcpy.channels, vc.chan.device_node) { |
3e2a037c | 2004 | seq_printf(s, "%s\t\t%s\n", chan->name, |
e8689e63 LW |
2005 | pl08x_state_str(chan->state)); |
2006 | } | |
2007 | ||
2008 | seq_printf(s, "\nPL08x virtual slave channels:\n"); | |
2009 | seq_printf(s, "CHANNEL:\tSTATE:\n"); | |
2010 | seq_printf(s, "--------\t------\n"); | |
01d8dc64 | 2011 | list_for_each_entry(chan, &pl08x->slave.channels, vc.chan.device_node) { |
3e2a037c | 2012 | seq_printf(s, "%s\t\t%s\n", chan->name, |
e8689e63 LW |
2013 | pl08x_state_str(chan->state)); |
2014 | } | |
2015 | ||
2016 | return 0; | |
2017 | } | |
2018 | ||
2019 | static int pl08x_debugfs_open(struct inode *inode, struct file *file) | |
2020 | { | |
2021 | return single_open(file, pl08x_debugfs_show, inode->i_private); | |
2022 | } | |
2023 | ||
2024 | static const struct file_operations pl08x_debugfs_operations = { | |
2025 | .open = pl08x_debugfs_open, | |
2026 | .read = seq_read, | |
2027 | .llseek = seq_lseek, | |
2028 | .release = single_release, | |
2029 | }; | |
2030 | ||
2031 | static void init_pl08x_debugfs(struct pl08x_driver_data *pl08x) | |
2032 | { | |
2033 | /* Expose a simple debugfs interface to view all clocks */ | |
3e27ee84 VK |
2034 | (void) debugfs_create_file(dev_name(&pl08x->adev->dev), |
2035 | S_IFREG | S_IRUGO, NULL, pl08x, | |
2036 | &pl08x_debugfs_operations); | |
e8689e63 LW |
2037 | } |
2038 | ||
2039 | #else | |
2040 | static inline void init_pl08x_debugfs(struct pl08x_driver_data *pl08x) | |
2041 | { | |
2042 | } | |
2043 | #endif | |
2044 | ||
aa4734da LW |
2045 | #ifdef CONFIG_OF |
2046 | static struct dma_chan *pl08x_find_chan_id(struct pl08x_driver_data *pl08x, | |
2047 | u32 id) | |
2048 | { | |
2049 | struct pl08x_dma_chan *chan; | |
2050 | ||
2051 | list_for_each_entry(chan, &pl08x->slave.channels, vc.chan.device_node) { | |
2052 | if (chan->signal == id) | |
2053 | return &chan->vc.chan; | |
2054 | } | |
2055 | ||
2056 | return NULL; | |
2057 | } | |
2058 | ||
2059 | static struct dma_chan *pl08x_of_xlate(struct of_phandle_args *dma_spec, | |
2060 | struct of_dma *ofdma) | |
2061 | { | |
2062 | struct pl08x_driver_data *pl08x = ofdma->of_dma_data; | |
aa4734da | 2063 | struct dma_chan *dma_chan; |
f9cd4761 | 2064 | struct pl08x_dma_chan *plchan; |
aa4734da LW |
2065 | |
2066 | if (!pl08x) | |
2067 | return NULL; | |
2068 | ||
f9cd4761 LW |
2069 | if (dma_spec->args_count != 2) { |
2070 | dev_err(&pl08x->adev->dev, | |
2071 | "DMA channel translation requires two cells\n"); | |
aa4734da | 2072 | return NULL; |
f9cd4761 | 2073 | } |
aa4734da LW |
2074 | |
2075 | dma_chan = pl08x_find_chan_id(pl08x, dma_spec->args[0]); | |
f9cd4761 LW |
2076 | if (!dma_chan) { |
2077 | dev_err(&pl08x->adev->dev, | |
2078 | "DMA slave channel not found\n"); | |
aa4734da | 2079 | return NULL; |
f9cd4761 | 2080 | } |
aa4734da | 2081 | |
f9cd4761 LW |
2082 | plchan = to_pl08x_chan(dma_chan); |
2083 | dev_dbg(&pl08x->adev->dev, | |
2084 | "translated channel for signal %d\n", | |
2085 | dma_spec->args[0]); | |
aa4734da | 2086 | |
f9cd4761 LW |
2087 | /* Augment channel data for applicable AHB buses */ |
2088 | plchan->cd->periph_buses = dma_spec->args[1]; | |
2089 | return dma_get_slave_channel(dma_chan); | |
aa4734da LW |
2090 | } |
2091 | ||
2092 | static int pl08x_of_probe(struct amba_device *adev, | |
2093 | struct pl08x_driver_data *pl08x, | |
2094 | struct device_node *np) | |
2095 | { | |
2096 | struct pl08x_platform_data *pd; | |
f9cd4761 | 2097 | struct pl08x_channel_data *chanp = NULL; |
aa4734da LW |
2098 | u32 cctl_memcpy = 0; |
2099 | u32 val; | |
2100 | int ret; | |
f9cd4761 | 2101 | int i; |
aa4734da LW |
2102 | |
2103 | pd = devm_kzalloc(&adev->dev, sizeof(*pd), GFP_KERNEL); | |
2104 | if (!pd) | |
2105 | return -ENOMEM; | |
2106 | ||
2107 | /* Eligible bus masters for fetching LLIs */ | |
2108 | if (of_property_read_bool(np, "lli-bus-interface-ahb1")) | |
2109 | pd->lli_buses |= PL08X_AHB1; | |
2110 | if (of_property_read_bool(np, "lli-bus-interface-ahb2")) | |
2111 | pd->lli_buses |= PL08X_AHB2; | |
2112 | if (!pd->lli_buses) { | |
2113 | dev_info(&adev->dev, "no bus masters for LLIs stated, assume all\n"); | |
2114 | pd->lli_buses |= PL08X_AHB1 | PL08X_AHB2; | |
2115 | } | |
2116 | ||
2117 | /* Eligible bus masters for memory access */ | |
2118 | if (of_property_read_bool(np, "mem-bus-interface-ahb1")) | |
2119 | pd->mem_buses |= PL08X_AHB1; | |
2120 | if (of_property_read_bool(np, "mem-bus-interface-ahb2")) | |
2121 | pd->mem_buses |= PL08X_AHB2; | |
2122 | if (!pd->mem_buses) { | |
2123 | dev_info(&adev->dev, "no bus masters for memory stated, assume all\n"); | |
2124 | pd->mem_buses |= PL08X_AHB1 | PL08X_AHB2; | |
2125 | } | |
2126 | ||
2127 | /* Parse the memcpy channel properties */ | |
2128 | ret = of_property_read_u32(np, "memcpy-burst-size", &val); | |
2129 | if (ret) { | |
2130 | dev_info(&adev->dev, "no memcpy burst size specified, using 1 byte\n"); | |
2131 | val = 1; | |
2132 | } | |
2133 | switch (val) { | |
2134 | default: | |
2135 | dev_err(&adev->dev, "illegal burst size for memcpy, set to 1\n"); | |
2136 | /* Fall through */ | |
2137 | case 1: | |
2138 | cctl_memcpy |= PL080_BSIZE_1 << PL080_CONTROL_SB_SIZE_SHIFT | | |
2139 | PL080_BSIZE_1 << PL080_CONTROL_DB_SIZE_SHIFT; | |
2140 | break; | |
2141 | case 4: | |
2142 | cctl_memcpy |= PL080_BSIZE_4 << PL080_CONTROL_SB_SIZE_SHIFT | | |
2143 | PL080_BSIZE_4 << PL080_CONTROL_DB_SIZE_SHIFT; | |
2144 | break; | |
2145 | case 8: | |
2146 | cctl_memcpy |= PL080_BSIZE_8 << PL080_CONTROL_SB_SIZE_SHIFT | | |
2147 | PL080_BSIZE_8 << PL080_CONTROL_DB_SIZE_SHIFT; | |
2148 | break; | |
2149 | case 16: | |
2150 | cctl_memcpy |= PL080_BSIZE_16 << PL080_CONTROL_SB_SIZE_SHIFT | | |
2151 | PL080_BSIZE_16 << PL080_CONTROL_DB_SIZE_SHIFT; | |
2152 | break; | |
2153 | case 32: | |
2154 | cctl_memcpy |= PL080_BSIZE_32 << PL080_CONTROL_SB_SIZE_SHIFT | | |
2155 | PL080_BSIZE_32 << PL080_CONTROL_DB_SIZE_SHIFT; | |
2156 | break; | |
2157 | case 64: | |
2158 | cctl_memcpy |= PL080_BSIZE_64 << PL080_CONTROL_SB_SIZE_SHIFT | | |
2159 | PL080_BSIZE_64 << PL080_CONTROL_DB_SIZE_SHIFT; | |
2160 | break; | |
2161 | case 128: | |
2162 | cctl_memcpy |= PL080_BSIZE_128 << PL080_CONTROL_SB_SIZE_SHIFT | | |
2163 | PL080_BSIZE_128 << PL080_CONTROL_DB_SIZE_SHIFT; | |
2164 | break; | |
2165 | case 256: | |
2166 | cctl_memcpy |= PL080_BSIZE_256 << PL080_CONTROL_SB_SIZE_SHIFT | | |
2167 | PL080_BSIZE_256 << PL080_CONTROL_DB_SIZE_SHIFT; | |
2168 | break; | |
2169 | } | |
2170 | ||
2171 | ret = of_property_read_u32(np, "memcpy-bus-width", &val); | |
2172 | if (ret) { | |
2173 | dev_info(&adev->dev, "no memcpy bus width specified, using 8 bits\n"); | |
2174 | val = 8; | |
2175 | } | |
2176 | switch (val) { | |
2177 | default: | |
2178 | dev_err(&adev->dev, "illegal bus width for memcpy, set to 8 bits\n"); | |
2179 | /* Fall through */ | |
2180 | case 8: | |
2181 | cctl_memcpy |= PL080_WIDTH_8BIT << PL080_CONTROL_SWIDTH_SHIFT | | |
2182 | PL080_WIDTH_8BIT << PL080_CONTROL_DWIDTH_SHIFT; | |
2183 | break; | |
2184 | case 16: | |
2185 | cctl_memcpy |= PL080_WIDTH_16BIT << PL080_CONTROL_SWIDTH_SHIFT | | |
2186 | PL080_WIDTH_16BIT << PL080_CONTROL_DWIDTH_SHIFT; | |
2187 | break; | |
2188 | case 32: | |
2189 | cctl_memcpy |= PL080_WIDTH_32BIT << PL080_CONTROL_SWIDTH_SHIFT | | |
2190 | PL080_WIDTH_32BIT << PL080_CONTROL_DWIDTH_SHIFT; | |
2191 | break; | |
2192 | } | |
2193 | ||
2194 | /* This is currently the only thing making sense */ | |
2195 | cctl_memcpy |= PL080_CONTROL_PROT_SYS; | |
2196 | ||
2197 | /* Set up memcpy channel */ | |
2198 | pd->memcpy_channel.bus_id = "memcpy"; | |
2199 | pd->memcpy_channel.cctl_memcpy = cctl_memcpy; | |
2200 | /* Use the buses that can access memory, obviously */ | |
2201 | pd->memcpy_channel.periph_buses = pd->mem_buses; | |
2202 | ||
f9cd4761 LW |
2203 | /* |
2204 | * Allocate channel data for all possible slave channels (one | |
2205 | * for each possible signal), channels will then be allocated | |
2206 | * for a device and have it's AHB interfaces set up at | |
2207 | * translation time. | |
2208 | */ | |
2209 | chanp = devm_kcalloc(&adev->dev, | |
2210 | pl08x->vd->signals, | |
2211 | sizeof(struct pl08x_channel_data), | |
2212 | GFP_KERNEL); | |
2213 | if (!chanp) | |
2214 | return -ENOMEM; | |
2215 | ||
2216 | pd->slave_channels = chanp; | |
2217 | for (i = 0; i < pl08x->vd->signals; i++) { | |
2218 | /* chanp->periph_buses will be assigned at translation */ | |
2219 | chanp->bus_id = kasprintf(GFP_KERNEL, "slave%d", i); | |
2220 | chanp++; | |
2221 | } | |
2222 | pd->num_slave_channels = pl08x->vd->signals; | |
2223 | ||
aa4734da LW |
2224 | pl08x->pd = pd; |
2225 | ||
2226 | return of_dma_controller_register(adev->dev.of_node, pl08x_of_xlate, | |
2227 | pl08x); | |
2228 | } | |
2229 | #else | |
2230 | static inline int pl08x_of_probe(struct amba_device *adev, | |
2231 | struct pl08x_driver_data *pl08x, | |
2232 | struct device_node *np) | |
2233 | { | |
2234 | return -EINVAL; | |
2235 | } | |
2236 | #endif | |
2237 | ||
aa25afad | 2238 | static int pl08x_probe(struct amba_device *adev, const struct amba_id *id) |
e8689e63 LW |
2239 | { |
2240 | struct pl08x_driver_data *pl08x; | |
f96ca9ec | 2241 | const struct vendor_data *vd = id->data; |
aa4734da | 2242 | struct device_node *np = adev->dev.of_node; |
ba6785ff | 2243 | u32 tsfr_size; |
e8689e63 LW |
2244 | int ret = 0; |
2245 | int i; | |
2246 | ||
2247 | ret = amba_request_regions(adev, NULL); | |
2248 | if (ret) | |
2249 | return ret; | |
2250 | ||
de1a2419 RK |
2251 | /* Ensure that we can do DMA */ |
2252 | ret = dma_set_mask_and_coherent(&adev->dev, DMA_BIT_MASK(32)); | |
2253 | if (ret) | |
2254 | goto out_no_pl08x; | |
2255 | ||
e8689e63 | 2256 | /* Create the driver state holder */ |
b201c111 | 2257 | pl08x = kzalloc(sizeof(*pl08x), GFP_KERNEL); |
e8689e63 LW |
2258 | if (!pl08x) { |
2259 | ret = -ENOMEM; | |
2260 | goto out_no_pl08x; | |
2261 | } | |
2262 | ||
f9cd4761 LW |
2263 | /* Assign useful pointers to the driver state */ |
2264 | pl08x->adev = adev; | |
2265 | pl08x->vd = vd; | |
2266 | ||
e8689e63 LW |
2267 | /* Initialize memcpy engine */ |
2268 | dma_cap_set(DMA_MEMCPY, pl08x->memcpy.cap_mask); | |
2269 | pl08x->memcpy.dev = &adev->dev; | |
e8689e63 LW |
2270 | pl08x->memcpy.device_free_chan_resources = pl08x_free_chan_resources; |
2271 | pl08x->memcpy.device_prep_dma_memcpy = pl08x_prep_dma_memcpy; | |
2272 | pl08x->memcpy.device_prep_dma_interrupt = pl08x_prep_dma_interrupt; | |
2273 | pl08x->memcpy.device_tx_status = pl08x_dma_tx_status; | |
2274 | pl08x->memcpy.device_issue_pending = pl08x_issue_pending; | |
bcd1b0b9 MR |
2275 | pl08x->memcpy.device_config = pl08x_config; |
2276 | pl08x->memcpy.device_pause = pl08x_pause; | |
2277 | pl08x->memcpy.device_resume = pl08x_resume; | |
2278 | pl08x->memcpy.device_terminate_all = pl08x_terminate_all; | |
ea524c7e MB |
2279 | pl08x->memcpy.src_addr_widths = PL80X_DMA_BUSWIDTHS; |
2280 | pl08x->memcpy.dst_addr_widths = PL80X_DMA_BUSWIDTHS; | |
2281 | pl08x->memcpy.directions = BIT(DMA_MEM_TO_MEM); | |
2282 | pl08x->memcpy.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT; | |
e8689e63 LW |
2283 | |
2284 | /* Initialize slave engine */ | |
2285 | dma_cap_set(DMA_SLAVE, pl08x->slave.cap_mask); | |
3b24c20b | 2286 | dma_cap_set(DMA_CYCLIC, pl08x->slave.cap_mask); |
e8689e63 | 2287 | pl08x->slave.dev = &adev->dev; |
e8689e63 LW |
2288 | pl08x->slave.device_free_chan_resources = pl08x_free_chan_resources; |
2289 | pl08x->slave.device_prep_dma_interrupt = pl08x_prep_dma_interrupt; | |
2290 | pl08x->slave.device_tx_status = pl08x_dma_tx_status; | |
2291 | pl08x->slave.device_issue_pending = pl08x_issue_pending; | |
2292 | pl08x->slave.device_prep_slave_sg = pl08x_prep_slave_sg; | |
3b24c20b | 2293 | pl08x->slave.device_prep_dma_cyclic = pl08x_prep_dma_cyclic; |
bcd1b0b9 MR |
2294 | pl08x->slave.device_config = pl08x_config; |
2295 | pl08x->slave.device_pause = pl08x_pause; | |
2296 | pl08x->slave.device_resume = pl08x_resume; | |
2297 | pl08x->slave.device_terminate_all = pl08x_terminate_all; | |
ea524c7e MB |
2298 | pl08x->slave.src_addr_widths = PL80X_DMA_BUSWIDTHS; |
2299 | pl08x->slave.dst_addr_widths = PL80X_DMA_BUSWIDTHS; | |
2300 | pl08x->slave.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); | |
2301 | pl08x->slave.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT; | |
e8689e63 LW |
2302 | |
2303 | /* Get the platform data */ | |
2304 | pl08x->pd = dev_get_platdata(&adev->dev); | |
2305 | if (!pl08x->pd) { | |
aa4734da LW |
2306 | if (np) { |
2307 | ret = pl08x_of_probe(adev, pl08x, np); | |
2308 | if (ret) | |
2309 | goto out_no_platdata; | |
2310 | } else { | |
2311 | dev_err(&adev->dev, "no platform data supplied\n"); | |
2312 | ret = -EINVAL; | |
2313 | goto out_no_platdata; | |
2314 | } | |
e8689e63 LW |
2315 | } |
2316 | ||
30749cb4 RKAL |
2317 | /* By default, AHB1 only. If dualmaster, from platform */ |
2318 | pl08x->lli_buses = PL08X_AHB1; | |
2319 | pl08x->mem_buses = PL08X_AHB1; | |
2320 | if (pl08x->vd->dualmaster) { | |
2321 | pl08x->lli_buses = pl08x->pd->lli_buses; | |
2322 | pl08x->mem_buses = pl08x->pd->mem_buses; | |
2323 | } | |
2324 | ||
da1b6c05 TF |
2325 | if (vd->pl080s) |
2326 | pl08x->lli_words = PL080S_LLI_WORDS; | |
2327 | else | |
2328 | pl08x->lli_words = PL080_LLI_WORDS; | |
ba6785ff TF |
2329 | tsfr_size = MAX_NUM_TSFR_LLIS * pl08x->lli_words * sizeof(u32); |
2330 | ||
e8689e63 LW |
2331 | /* A DMA memory pool for LLIs, align on 1-byte boundary */ |
2332 | pl08x->pool = dma_pool_create(DRIVER_NAME, &pl08x->adev->dev, | |
ba6785ff | 2333 | tsfr_size, PL08X_ALIGN, 0); |
e8689e63 LW |
2334 | if (!pl08x->pool) { |
2335 | ret = -ENOMEM; | |
2336 | goto out_no_lli_pool; | |
2337 | } | |
2338 | ||
e8689e63 LW |
2339 | pl08x->base = ioremap(adev->res.start, resource_size(&adev->res)); |
2340 | if (!pl08x->base) { | |
2341 | ret = -ENOMEM; | |
2342 | goto out_no_ioremap; | |
2343 | } | |
2344 | ||
2345 | /* Turn on the PL08x */ | |
2346 | pl08x_ensure_on(pl08x); | |
2347 | ||
94ae8522 | 2348 | /* Attach the interrupt handler */ |
e8689e63 LW |
2349 | writel(0x000000FF, pl08x->base + PL080_ERR_CLEAR); |
2350 | writel(0x000000FF, pl08x->base + PL080_TC_CLEAR); | |
2351 | ||
174b537a | 2352 | ret = request_irq(adev->irq[0], pl08x_irq, 0, DRIVER_NAME, pl08x); |
e8689e63 LW |
2353 | if (ret) { |
2354 | dev_err(&adev->dev, "%s failed to request interrupt %d\n", | |
2355 | __func__, adev->irq[0]); | |
2356 | goto out_no_irq; | |
2357 | } | |
2358 | ||
2359 | /* Initialize physical channels */ | |
affa115e | 2360 | pl08x->phy_chans = kzalloc((vd->channels * sizeof(*pl08x->phy_chans)), |
e8689e63 LW |
2361 | GFP_KERNEL); |
2362 | if (!pl08x->phy_chans) { | |
2363 | dev_err(&adev->dev, "%s failed to allocate " | |
2364 | "physical channel holders\n", | |
2365 | __func__); | |
983d7beb | 2366 | ret = -ENOMEM; |
e8689e63 LW |
2367 | goto out_no_phychans; |
2368 | } | |
2369 | ||
2370 | for (i = 0; i < vd->channels; i++) { | |
2371 | struct pl08x_phy_chan *ch = &pl08x->phy_chans[i]; | |
2372 | ||
2373 | ch->id = i; | |
2374 | ch->base = pl08x->base + PL080_Cx_BASE(i); | |
d86ccea7 | 2375 | ch->reg_config = ch->base + vd->config_offset; |
e8689e63 | 2376 | spin_lock_init(&ch->lock); |
affa115e LW |
2377 | |
2378 | /* | |
2379 | * Nomadik variants can have channels that are locked | |
2380 | * down for the secure world only. Lock up these channels | |
2381 | * by perpetually serving a dummy virtual channel. | |
2382 | */ | |
2383 | if (vd->nomadik) { | |
2384 | u32 val; | |
2385 | ||
d86ccea7 | 2386 | val = readl(ch->reg_config); |
affa115e LW |
2387 | if (val & (PL080N_CONFIG_ITPROT | PL080N_CONFIG_SECPROT)) { |
2388 | dev_info(&adev->dev, "physical channel %d reserved for secure access only\n", i); | |
2389 | ch->locked = true; | |
2390 | } | |
2391 | } | |
2392 | ||
175a5e61 VK |
2393 | dev_dbg(&adev->dev, "physical channel %d is %s\n", |
2394 | i, pl08x_phy_channel_busy(ch) ? "BUSY" : "FREE"); | |
e8689e63 LW |
2395 | } |
2396 | ||
2397 | /* Register as many memcpy channels as there are physical channels */ | |
2398 | ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->memcpy, | |
2399 | pl08x->vd->channels, false); | |
2400 | if (ret <= 0) { | |
2401 | dev_warn(&pl08x->adev->dev, | |
2402 | "%s failed to enumerate memcpy channels - %d\n", | |
2403 | __func__, ret); | |
2404 | goto out_no_memcpy; | |
2405 | } | |
e8689e63 LW |
2406 | |
2407 | /* Register slave channels */ | |
2408 | ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->slave, | |
3e27ee84 | 2409 | pl08x->pd->num_slave_channels, true); |
1080411c | 2410 | if (ret < 0) { |
e8689e63 LW |
2411 | dev_warn(&pl08x->adev->dev, |
2412 | "%s failed to enumerate slave channels - %d\n", | |
2413 | __func__, ret); | |
2414 | goto out_no_slave; | |
2415 | } | |
e8689e63 LW |
2416 | |
2417 | ret = dma_async_device_register(&pl08x->memcpy); | |
2418 | if (ret) { | |
2419 | dev_warn(&pl08x->adev->dev, | |
2420 | "%s failed to register memcpy as an async device - %d\n", | |
2421 | __func__, ret); | |
2422 | goto out_no_memcpy_reg; | |
2423 | } | |
2424 | ||
2425 | ret = dma_async_device_register(&pl08x->slave); | |
2426 | if (ret) { | |
2427 | dev_warn(&pl08x->adev->dev, | |
2428 | "%s failed to register slave as an async device - %d\n", | |
2429 | __func__, ret); | |
2430 | goto out_no_slave_reg; | |
2431 | } | |
2432 | ||
2433 | amba_set_drvdata(adev, pl08x); | |
2434 | init_pl08x_debugfs(pl08x); | |
da1b6c05 TF |
2435 | dev_info(&pl08x->adev->dev, "DMA: PL%03x%s rev%u at 0x%08llx irq %d\n", |
2436 | amba_part(adev), pl08x->vd->pl080s ? "s" : "", amba_rev(adev), | |
b05cd8f4 | 2437 | (unsigned long long)adev->res.start, adev->irq[0]); |
b7b6018b | 2438 | |
e8689e63 LW |
2439 | return 0; |
2440 | ||
2441 | out_no_slave_reg: | |
2442 | dma_async_device_unregister(&pl08x->memcpy); | |
2443 | out_no_memcpy_reg: | |
2444 | pl08x_free_virtual_channels(&pl08x->slave); | |
2445 | out_no_slave: | |
2446 | pl08x_free_virtual_channels(&pl08x->memcpy); | |
2447 | out_no_memcpy: | |
2448 | kfree(pl08x->phy_chans); | |
2449 | out_no_phychans: | |
2450 | free_irq(adev->irq[0], pl08x); | |
2451 | out_no_irq: | |
2452 | iounmap(pl08x->base); | |
2453 | out_no_ioremap: | |
2454 | dma_pool_destroy(pl08x->pool); | |
2455 | out_no_lli_pool: | |
2456 | out_no_platdata: | |
2457 | kfree(pl08x); | |
2458 | out_no_pl08x: | |
2459 | amba_release_regions(adev); | |
2460 | return ret; | |
2461 | } | |
2462 | ||
2463 | /* PL080 has 8 channels and the PL080 have just 2 */ | |
2464 | static struct vendor_data vendor_pl080 = { | |
d86ccea7 | 2465 | .config_offset = PL080_CH_CONFIG, |
e8689e63 | 2466 | .channels = 8, |
f9cd4761 | 2467 | .signals = 16, |
e8689e63 | 2468 | .dualmaster = true, |
5110e51d | 2469 | .max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK, |
e8689e63 LW |
2470 | }; |
2471 | ||
affa115e | 2472 | static struct vendor_data vendor_nomadik = { |
d86ccea7 | 2473 | .config_offset = PL080_CH_CONFIG, |
affa115e | 2474 | .channels = 8, |
f9cd4761 | 2475 | .signals = 32, |
affa115e LW |
2476 | .dualmaster = true, |
2477 | .nomadik = true, | |
5110e51d | 2478 | .max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK, |
affa115e LW |
2479 | }; |
2480 | ||
da1b6c05 TF |
2481 | static struct vendor_data vendor_pl080s = { |
2482 | .config_offset = PL080S_CH_CONFIG, | |
2483 | .channels = 8, | |
f9cd4761 | 2484 | .signals = 32, |
da1b6c05 | 2485 | .pl080s = true, |
5110e51d | 2486 | .max_transfer_size = PL080S_CONTROL_TRANSFER_SIZE_MASK, |
affa115e LW |
2487 | }; |
2488 | ||
e8689e63 | 2489 | static struct vendor_data vendor_pl081 = { |
d86ccea7 | 2490 | .config_offset = PL080_CH_CONFIG, |
e8689e63 | 2491 | .channels = 2, |
f9cd4761 | 2492 | .signals = 16, |
e8689e63 | 2493 | .dualmaster = false, |
5110e51d | 2494 | .max_transfer_size = PL080_CONTROL_TRANSFER_SIZE_MASK, |
e8689e63 LW |
2495 | }; |
2496 | ||
2497 | static struct amba_id pl08x_ids[] = { | |
da1b6c05 TF |
2498 | /* Samsung PL080S variant */ |
2499 | { | |
2500 | .id = 0x0a141080, | |
2501 | .mask = 0xffffffff, | |
2502 | .data = &vendor_pl080s, | |
2503 | }, | |
e8689e63 LW |
2504 | /* PL080 */ |
2505 | { | |
2506 | .id = 0x00041080, | |
2507 | .mask = 0x000fffff, | |
2508 | .data = &vendor_pl080, | |
2509 | }, | |
2510 | /* PL081 */ | |
2511 | { | |
2512 | .id = 0x00041081, | |
2513 | .mask = 0x000fffff, | |
2514 | .data = &vendor_pl081, | |
2515 | }, | |
2516 | /* Nomadik 8815 PL080 variant */ | |
2517 | { | |
affa115e | 2518 | .id = 0x00280080, |
e8689e63 | 2519 | .mask = 0x00ffffff, |
affa115e | 2520 | .data = &vendor_nomadik, |
e8689e63 LW |
2521 | }, |
2522 | { 0, 0 }, | |
2523 | }; | |
2524 | ||
037566df DM |
2525 | MODULE_DEVICE_TABLE(amba, pl08x_ids); |
2526 | ||
e8689e63 LW |
2527 | static struct amba_driver pl08x_amba_driver = { |
2528 | .drv.name = DRIVER_NAME, | |
2529 | .id_table = pl08x_ids, | |
2530 | .probe = pl08x_probe, | |
2531 | }; | |
2532 | ||
2533 | static int __init pl08x_init(void) | |
2534 | { | |
2535 | int retval; | |
2536 | retval = amba_driver_register(&pl08x_amba_driver); | |
2537 | if (retval) | |
2538 | printk(KERN_WARNING DRIVER_NAME | |
e8b5e11d | 2539 | "failed to register as an AMBA device (%d)\n", |
e8689e63 LW |
2540 | retval); |
2541 | return retval; | |
2542 | } | |
2543 | subsys_initcall(pl08x_init); |