Commit | Line | Data |
---|---|---|
e24c7452 | 1 | /* |
ca632f55 | 2 | * Designware SPI core controller driver (refer pxa2xx_spi.c) |
e24c7452 FT |
3 | * |
4 | * Copyright (c) 2009, Intel Corporation. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify it | |
7 | * under the terms and conditions of the GNU General Public License, | |
8 | * version 2, as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope it will be useful, but WITHOUT | |
11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
13 | * more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License along with | |
16 | * this program; if not, write to the Free Software Foundation, Inc., | |
17 | * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. | |
18 | */ | |
19 | ||
20 | #include <linux/dma-mapping.h> | |
21 | #include <linux/interrupt.h> | |
d7614de4 | 22 | #include <linux/module.h> |
e24c7452 FT |
23 | #include <linux/highmem.h> |
24 | #include <linux/delay.h> | |
5a0e3ad6 | 25 | #include <linux/slab.h> |
e24c7452 | 26 | #include <linux/spi/spi.h> |
d9c73bb8 | 27 | #include <linux/gpio.h> |
e24c7452 | 28 | |
ca632f55 | 29 | #include "spi-dw.h" |
568a60ed | 30 | |
e24c7452 FT |
31 | #ifdef CONFIG_DEBUG_FS |
32 | #include <linux/debugfs.h> | |
33 | #endif | |
34 | ||
35 | #define START_STATE ((void *)0) | |
36 | #define RUNNING_STATE ((void *)1) | |
37 | #define DONE_STATE ((void *)2) | |
38 | #define ERROR_STATE ((void *)-1) | |
39 | ||
e24c7452 FT |
40 | /* Slave spi_dev related */ |
41 | struct chip_data { | |
42 | u16 cr0; | |
43 | u8 cs; /* chip select pin */ | |
44 | u8 n_bytes; /* current is a 1/2/4 byte op */ | |
45 | u8 tmode; /* TR/TO/RO/EEPROM */ | |
46 | u8 type; /* SPI/SSP/MicroWire */ | |
47 | ||
48 | u8 poll_mode; /* 1 means use poll mode */ | |
49 | ||
50 | u32 dma_width; | |
51 | u32 rx_threshold; | |
52 | u32 tx_threshold; | |
53 | u8 enable_dma; | |
54 | u8 bits_per_word; | |
55 | u16 clk_div; /* baud rate divider */ | |
56 | u32 speed_hz; /* baud rate */ | |
e24c7452 FT |
57 | void (*cs_control)(u32 command); |
58 | }; | |
59 | ||
60 | #ifdef CONFIG_DEBUG_FS | |
e24c7452 FT |
61 | #define SPI_REGS_BUFSIZE 1024 |
62 | static ssize_t spi_show_regs(struct file *file, char __user *user_buf, | |
63 | size_t count, loff_t *ppos) | |
64 | { | |
65 | struct dw_spi *dws; | |
66 | char *buf; | |
67 | u32 len = 0; | |
68 | ssize_t ret; | |
69 | ||
70 | dws = file->private_data; | |
71 | ||
72 | buf = kzalloc(SPI_REGS_BUFSIZE, GFP_KERNEL); | |
73 | if (!buf) | |
74 | return 0; | |
75 | ||
76 | len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, | |
77 | "MRST SPI0 registers:\n"); | |
78 | len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, | |
79 | "=================================\n"); | |
80 | len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, | |
7eb187b3 | 81 | "CTRL0: \t\t0x%08x\n", dw_readl(dws, DW_SPI_CTRL0)); |
e24c7452 | 82 | len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, |
7eb187b3 | 83 | "CTRL1: \t\t0x%08x\n", dw_readl(dws, DW_SPI_CTRL1)); |
e24c7452 | 84 | len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, |
7eb187b3 | 85 | "SSIENR: \t0x%08x\n", dw_readl(dws, DW_SPI_SSIENR)); |
e24c7452 | 86 | len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, |
7eb187b3 | 87 | "SER: \t\t0x%08x\n", dw_readl(dws, DW_SPI_SER)); |
e24c7452 | 88 | len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, |
7eb187b3 | 89 | "BAUDR: \t\t0x%08x\n", dw_readl(dws, DW_SPI_BAUDR)); |
e24c7452 | 90 | len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, |
7eb187b3 | 91 | "TXFTLR: \t0x%08x\n", dw_readl(dws, DW_SPI_TXFLTR)); |
e24c7452 | 92 | len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, |
7eb187b3 | 93 | "RXFTLR: \t0x%08x\n", dw_readl(dws, DW_SPI_RXFLTR)); |
e24c7452 | 94 | len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, |
7eb187b3 | 95 | "TXFLR: \t\t0x%08x\n", dw_readl(dws, DW_SPI_TXFLR)); |
e24c7452 | 96 | len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, |
7eb187b3 | 97 | "RXFLR: \t\t0x%08x\n", dw_readl(dws, DW_SPI_RXFLR)); |
e24c7452 | 98 | len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, |
7eb187b3 | 99 | "SR: \t\t0x%08x\n", dw_readl(dws, DW_SPI_SR)); |
e24c7452 | 100 | len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, |
7eb187b3 | 101 | "IMR: \t\t0x%08x\n", dw_readl(dws, DW_SPI_IMR)); |
e24c7452 | 102 | len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, |
7eb187b3 | 103 | "ISR: \t\t0x%08x\n", dw_readl(dws, DW_SPI_ISR)); |
e24c7452 | 104 | len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, |
7eb187b3 | 105 | "DMACR: \t\t0x%08x\n", dw_readl(dws, DW_SPI_DMACR)); |
e24c7452 | 106 | len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, |
7eb187b3 | 107 | "DMATDLR: \t0x%08x\n", dw_readl(dws, DW_SPI_DMATDLR)); |
e24c7452 | 108 | len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, |
7eb187b3 | 109 | "DMARDLR: \t0x%08x\n", dw_readl(dws, DW_SPI_DMARDLR)); |
e24c7452 FT |
110 | len += snprintf(buf + len, SPI_REGS_BUFSIZE - len, |
111 | "=================================\n"); | |
112 | ||
113 | ret = simple_read_from_buffer(user_buf, count, ppos, buf, len); | |
114 | kfree(buf); | |
115 | return ret; | |
116 | } | |
117 | ||
118 | static const struct file_operations mrst_spi_regs_ops = { | |
119 | .owner = THIS_MODULE, | |
234e3405 | 120 | .open = simple_open, |
e24c7452 | 121 | .read = spi_show_regs, |
6038f373 | 122 | .llseek = default_llseek, |
e24c7452 FT |
123 | }; |
124 | ||
125 | static int mrst_spi_debugfs_init(struct dw_spi *dws) | |
126 | { | |
127 | dws->debugfs = debugfs_create_dir("mrst_spi", NULL); | |
128 | if (!dws->debugfs) | |
129 | return -ENOMEM; | |
130 | ||
131 | debugfs_create_file("registers", S_IFREG | S_IRUGO, | |
132 | dws->debugfs, (void *)dws, &mrst_spi_regs_ops); | |
133 | return 0; | |
134 | } | |
135 | ||
136 | static void mrst_spi_debugfs_remove(struct dw_spi *dws) | |
137 | { | |
138 | if (dws->debugfs) | |
139 | debugfs_remove_recursive(dws->debugfs); | |
140 | } | |
141 | ||
142 | #else | |
143 | static inline int mrst_spi_debugfs_init(struct dw_spi *dws) | |
144 | { | |
20a588fc | 145 | return 0; |
e24c7452 FT |
146 | } |
147 | ||
148 | static inline void mrst_spi_debugfs_remove(struct dw_spi *dws) | |
149 | { | |
150 | } | |
151 | #endif /* CONFIG_DEBUG_FS */ | |
152 | ||
2ff271bf AD |
153 | /* Return the max entries we can fill into tx fifo */ |
154 | static inline u32 tx_max(struct dw_spi *dws) | |
155 | { | |
156 | u32 tx_left, tx_room, rxtx_gap; | |
157 | ||
158 | tx_left = (dws->tx_end - dws->tx) / dws->n_bytes; | |
7eb187b3 | 159 | tx_room = dws->fifo_len - dw_readw(dws, DW_SPI_TXFLR); |
2ff271bf AD |
160 | |
161 | /* | |
162 | * Another concern is about the tx/rx mismatch, we | |
163 | * though to use (dws->fifo_len - rxflr - txflr) as | |
164 | * one maximum value for tx, but it doesn't cover the | |
165 | * data which is out of tx/rx fifo and inside the | |
166 | * shift registers. So a control from sw point of | |
167 | * view is taken. | |
168 | */ | |
169 | rxtx_gap = ((dws->rx_end - dws->rx) - (dws->tx_end - dws->tx)) | |
170 | / dws->n_bytes; | |
171 | ||
172 | return min3(tx_left, tx_room, (u32) (dws->fifo_len - rxtx_gap)); | |
173 | } | |
174 | ||
175 | /* Return the max entries we should read out of rx fifo */ | |
176 | static inline u32 rx_max(struct dw_spi *dws) | |
177 | { | |
178 | u32 rx_left = (dws->rx_end - dws->rx) / dws->n_bytes; | |
179 | ||
7eb187b3 | 180 | return min(rx_left, (u32)dw_readw(dws, DW_SPI_RXFLR)); |
2ff271bf AD |
181 | } |
182 | ||
3b8a4dd3 | 183 | static void dw_writer(struct dw_spi *dws) |
e24c7452 | 184 | { |
2ff271bf | 185 | u32 max = tx_max(dws); |
de6efe0a | 186 | u16 txw = 0; |
e24c7452 | 187 | |
2ff271bf AD |
188 | while (max--) { |
189 | /* Set the tx word if the transfer's original "tx" is not null */ | |
190 | if (dws->tx_end - dws->len) { | |
191 | if (dws->n_bytes == 1) | |
192 | txw = *(u8 *)(dws->tx); | |
193 | else | |
194 | txw = *(u16 *)(dws->tx); | |
195 | } | |
7eb187b3 | 196 | dw_writew(dws, DW_SPI_DR, txw); |
2ff271bf | 197 | dws->tx += dws->n_bytes; |
e24c7452 | 198 | } |
e24c7452 FT |
199 | } |
200 | ||
3b8a4dd3 | 201 | static void dw_reader(struct dw_spi *dws) |
e24c7452 | 202 | { |
2ff271bf | 203 | u32 max = rx_max(dws); |
de6efe0a | 204 | u16 rxw; |
e24c7452 | 205 | |
2ff271bf | 206 | while (max--) { |
7eb187b3 | 207 | rxw = dw_readw(dws, DW_SPI_DR); |
de6efe0a FT |
208 | /* Care rx only if the transfer's original "rx" is not null */ |
209 | if (dws->rx_end - dws->len) { | |
210 | if (dws->n_bytes == 1) | |
211 | *(u8 *)(dws->rx) = rxw; | |
212 | else | |
213 | *(u16 *)(dws->rx) = rxw; | |
214 | } | |
215 | dws->rx += dws->n_bytes; | |
e24c7452 | 216 | } |
e24c7452 FT |
217 | } |
218 | ||
219 | static void *next_transfer(struct dw_spi *dws) | |
220 | { | |
221 | struct spi_message *msg = dws->cur_msg; | |
222 | struct spi_transfer *trans = dws->cur_transfer; | |
223 | ||
224 | /* Move to next transfer */ | |
225 | if (trans->transfer_list.next != &msg->transfers) { | |
226 | dws->cur_transfer = | |
227 | list_entry(trans->transfer_list.next, | |
228 | struct spi_transfer, | |
229 | transfer_list); | |
230 | return RUNNING_STATE; | |
231 | } else | |
232 | return DONE_STATE; | |
233 | } | |
234 | ||
235 | /* | |
236 | * Note: first step is the protocol driver prepares | |
237 | * a dma-capable memory, and this func just need translate | |
238 | * the virt addr to physical | |
239 | */ | |
240 | static int map_dma_buffers(struct dw_spi *dws) | |
241 | { | |
7063c0d9 FT |
242 | if (!dws->cur_msg->is_dma_mapped |
243 | || !dws->dma_inited | |
244 | || !dws->cur_chip->enable_dma | |
245 | || !dws->dma_ops) | |
e24c7452 FT |
246 | return 0; |
247 | ||
248 | if (dws->cur_transfer->tx_dma) | |
249 | dws->tx_dma = dws->cur_transfer->tx_dma; | |
250 | ||
251 | if (dws->cur_transfer->rx_dma) | |
252 | dws->rx_dma = dws->cur_transfer->rx_dma; | |
253 | ||
254 | return 1; | |
255 | } | |
256 | ||
257 | /* Caller already set message->status; dma and pio irqs are blocked */ | |
258 | static void giveback(struct dw_spi *dws) | |
259 | { | |
260 | struct spi_transfer *last_transfer; | |
e24c7452 FT |
261 | struct spi_message *msg; |
262 | ||
e24c7452 FT |
263 | msg = dws->cur_msg; |
264 | dws->cur_msg = NULL; | |
265 | dws->cur_transfer = NULL; | |
266 | dws->prev_chip = dws->cur_chip; | |
267 | dws->cur_chip = NULL; | |
268 | dws->dma_mapped = 0; | |
e24c7452 | 269 | |
23e2c2aa | 270 | last_transfer = list_last_entry(&msg->transfers, struct spi_transfer, |
e24c7452 FT |
271 | transfer_list); |
272 | ||
d9c73bb8 BS |
273 | if (!last_transfer->cs_change) |
274 | spi_chip_sel(dws, dws->cur_msg->spi, 0); | |
e24c7452 | 275 | |
ec37e8e1 | 276 | spi_finalize_current_message(dws->master); |
e24c7452 FT |
277 | } |
278 | ||
279 | static void int_error_stop(struct dw_spi *dws, const char *msg) | |
280 | { | |
8a33a373 | 281 | /* Stop the hw */ |
e24c7452 FT |
282 | spi_enable_chip(dws, 0); |
283 | ||
284 | dev_err(&dws->master->dev, "%s\n", msg); | |
285 | dws->cur_msg->state = ERROR_STATE; | |
286 | tasklet_schedule(&dws->pump_transfers); | |
287 | } | |
288 | ||
7063c0d9 | 289 | void dw_spi_xfer_done(struct dw_spi *dws) |
e24c7452 | 290 | { |
25985edc | 291 | /* Update total byte transferred return count actual bytes read */ |
e24c7452 FT |
292 | dws->cur_msg->actual_length += dws->len; |
293 | ||
294 | /* Move to next transfer */ | |
295 | dws->cur_msg->state = next_transfer(dws); | |
296 | ||
297 | /* Handle end of message */ | |
298 | if (dws->cur_msg->state == DONE_STATE) { | |
299 | dws->cur_msg->status = 0; | |
300 | giveback(dws); | |
301 | } else | |
302 | tasklet_schedule(&dws->pump_transfers); | |
303 | } | |
7063c0d9 | 304 | EXPORT_SYMBOL_GPL(dw_spi_xfer_done); |
e24c7452 FT |
305 | |
306 | static irqreturn_t interrupt_transfer(struct dw_spi *dws) | |
307 | { | |
7eb187b3 | 308 | u16 irq_status = dw_readw(dws, DW_SPI_ISR); |
e24c7452 | 309 | |
e24c7452 FT |
310 | /* Error handling */ |
311 | if (irq_status & (SPI_INT_TXOI | SPI_INT_RXOI | SPI_INT_RXUI)) { | |
7eb187b3 HS |
312 | dw_readw(dws, DW_SPI_TXOICR); |
313 | dw_readw(dws, DW_SPI_RXOICR); | |
314 | dw_readw(dws, DW_SPI_RXUICR); | |
3b8a4dd3 | 315 | int_error_stop(dws, "interrupt_transfer: fifo overrun/underrun"); |
e24c7452 FT |
316 | return IRQ_HANDLED; |
317 | } | |
318 | ||
3b8a4dd3 AD |
319 | dw_reader(dws); |
320 | if (dws->rx_end == dws->rx) { | |
321 | spi_mask_intr(dws, SPI_INT_TXEI); | |
322 | dw_spi_xfer_done(dws); | |
323 | return IRQ_HANDLED; | |
324 | } | |
552e4509 FT |
325 | if (irq_status & SPI_INT_TXEI) { |
326 | spi_mask_intr(dws, SPI_INT_TXEI); | |
3b8a4dd3 AD |
327 | dw_writer(dws); |
328 | /* Enable TX irq always, it will be disabled when RX finished */ | |
329 | spi_umask_intr(dws, SPI_INT_TXEI); | |
e24c7452 FT |
330 | } |
331 | ||
e24c7452 FT |
332 | return IRQ_HANDLED; |
333 | } | |
334 | ||
335 | static irqreturn_t dw_spi_irq(int irq, void *dev_id) | |
336 | { | |
337 | struct dw_spi *dws = dev_id; | |
7eb187b3 | 338 | u16 irq_status = dw_readw(dws, DW_SPI_ISR) & 0x3f; |
cbcc062a | 339 | |
cbcc062a YW |
340 | if (!irq_status) |
341 | return IRQ_NONE; | |
e24c7452 FT |
342 | |
343 | if (!dws->cur_msg) { | |
344 | spi_mask_intr(dws, SPI_INT_TXEI); | |
e24c7452 FT |
345 | return IRQ_HANDLED; |
346 | } | |
347 | ||
348 | return dws->transfer_handler(dws); | |
349 | } | |
350 | ||
351 | /* Must be called inside pump_transfers() */ | |
352 | static void poll_transfer(struct dw_spi *dws) | |
353 | { | |
2ff271bf AD |
354 | do { |
355 | dw_writer(dws); | |
de6efe0a | 356 | dw_reader(dws); |
2ff271bf AD |
357 | cpu_relax(); |
358 | } while (dws->rx_end > dws->rx); | |
e24c7452 | 359 | |
7063c0d9 | 360 | dw_spi_xfer_done(dws); |
e24c7452 FT |
361 | } |
362 | ||
363 | static void pump_transfers(unsigned long data) | |
364 | { | |
365 | struct dw_spi *dws = (struct dw_spi *)data; | |
366 | struct spi_message *message = NULL; | |
367 | struct spi_transfer *transfer = NULL; | |
368 | struct spi_transfer *previous = NULL; | |
369 | struct spi_device *spi = NULL; | |
370 | struct chip_data *chip = NULL; | |
371 | u8 bits = 0; | |
372 | u8 imask = 0; | |
373 | u8 cs_change = 0; | |
552e4509 | 374 | u16 txint_level = 0; |
e24c7452 FT |
375 | u16 clk_div = 0; |
376 | u32 speed = 0; | |
377 | u32 cr0 = 0; | |
378 | ||
379 | /* Get current state information */ | |
380 | message = dws->cur_msg; | |
381 | transfer = dws->cur_transfer; | |
382 | chip = dws->cur_chip; | |
383 | spi = message->spi; | |
384 | ||
552e4509 FT |
385 | if (unlikely(!chip->clk_div)) |
386 | chip->clk_div = dws->max_freq / chip->speed_hz; | |
387 | ||
e24c7452 FT |
388 | if (message->state == ERROR_STATE) { |
389 | message->status = -EIO; | |
390 | goto early_exit; | |
391 | } | |
392 | ||
393 | /* Handle end of message */ | |
394 | if (message->state == DONE_STATE) { | |
395 | message->status = 0; | |
396 | goto early_exit; | |
397 | } | |
398 | ||
399 | /* Delay if requested at end of transfer*/ | |
400 | if (message->state == RUNNING_STATE) { | |
401 | previous = list_entry(transfer->transfer_list.prev, | |
402 | struct spi_transfer, | |
403 | transfer_list); | |
404 | if (previous->delay_usecs) | |
405 | udelay(previous->delay_usecs); | |
406 | } | |
407 | ||
408 | dws->n_bytes = chip->n_bytes; | |
409 | dws->dma_width = chip->dma_width; | |
410 | dws->cs_control = chip->cs_control; | |
411 | ||
412 | dws->rx_dma = transfer->rx_dma; | |
413 | dws->tx_dma = transfer->tx_dma; | |
414 | dws->tx = (void *)transfer->tx_buf; | |
415 | dws->tx_end = dws->tx + transfer->len; | |
416 | dws->rx = transfer->rx_buf; | |
417 | dws->rx_end = dws->rx + transfer->len; | |
e24c7452 FT |
418 | dws->len = dws->cur_transfer->len; |
419 | if (chip != dws->prev_chip) | |
420 | cs_change = 1; | |
421 | ||
422 | cr0 = chip->cr0; | |
423 | ||
424 | /* Handle per transfer options for bpw and speed */ | |
425 | if (transfer->speed_hz) { | |
426 | speed = chip->speed_hz; | |
427 | ||
428 | if (transfer->speed_hz != speed) { | |
429 | speed = transfer->speed_hz; | |
e24c7452 FT |
430 | |
431 | /* clk_div doesn't support odd number */ | |
432 | clk_div = dws->max_freq / speed; | |
552e4509 | 433 | clk_div = (clk_div + 1) & 0xfffe; |
e24c7452 FT |
434 | |
435 | chip->speed_hz = speed; | |
436 | chip->clk_div = clk_div; | |
437 | } | |
438 | } | |
439 | if (transfer->bits_per_word) { | |
440 | bits = transfer->bits_per_word; | |
24778be2 | 441 | dws->n_bytes = dws->dma_width = bits >> 3; |
e24c7452 FT |
442 | cr0 = (bits - 1) |
443 | | (chip->type << SPI_FRF_OFFSET) | |
444 | | (spi->mode << SPI_MODE_OFFSET) | |
445 | | (chip->tmode << SPI_TMOD_OFFSET); | |
446 | } | |
447 | message->state = RUNNING_STATE; | |
448 | ||
052dc7c4 GS |
449 | /* |
450 | * Adjust transfer mode if necessary. Requires platform dependent | |
451 | * chipselect mechanism. | |
452 | */ | |
453 | if (dws->cs_control) { | |
454 | if (dws->rx && dws->tx) | |
e3e55ff5 | 455 | chip->tmode = SPI_TMOD_TR; |
052dc7c4 | 456 | else if (dws->rx) |
e3e55ff5 | 457 | chip->tmode = SPI_TMOD_RO; |
052dc7c4 | 458 | else |
e3e55ff5 | 459 | chip->tmode = SPI_TMOD_TO; |
052dc7c4 | 460 | |
e3e55ff5 | 461 | cr0 &= ~SPI_TMOD_MASK; |
052dc7c4 GS |
462 | cr0 |= (chip->tmode << SPI_TMOD_OFFSET); |
463 | } | |
464 | ||
e24c7452 FT |
465 | /* Check if current transfer is a DMA transaction */ |
466 | dws->dma_mapped = map_dma_buffers(dws); | |
467 | ||
552e4509 FT |
468 | /* |
469 | * Interrupt mode | |
470 | * we only need set the TXEI IRQ, as TX/RX always happen syncronizely | |
471 | */ | |
e24c7452 | 472 | if (!dws->dma_mapped && !chip->poll_mode) { |
552e4509 FT |
473 | int templen = dws->len / dws->n_bytes; |
474 | txint_level = dws->fifo_len / 2; | |
475 | txint_level = (templen > txint_level) ? txint_level : templen; | |
476 | ||
3b8a4dd3 | 477 | imask |= SPI_INT_TXEI | SPI_INT_TXOI | SPI_INT_RXUI | SPI_INT_RXOI; |
e24c7452 FT |
478 | dws->transfer_handler = interrupt_transfer; |
479 | } | |
480 | ||
481 | /* | |
482 | * Reprogram registers only if | |
483 | * 1. chip select changes | |
484 | * 2. clk_div is changed | |
485 | * 3. control value changes | |
486 | */ | |
7eb187b3 | 487 | if (dw_readw(dws, DW_SPI_CTRL0) != cr0 || cs_change || clk_div || imask) { |
e24c7452 FT |
488 | spi_enable_chip(dws, 0); |
489 | ||
7eb187b3 HS |
490 | if (dw_readw(dws, DW_SPI_CTRL0) != cr0) |
491 | dw_writew(dws, DW_SPI_CTRL0, cr0); | |
e24c7452 | 492 | |
552e4509 | 493 | spi_set_clk(dws, clk_div ? clk_div : chip->clk_div); |
d9c73bb8 | 494 | spi_chip_sel(dws, spi, 1); |
552e4509 | 495 | |
2f263d9d | 496 | /* Set the interrupt mask, for poll mode just disable all int */ |
e24c7452 | 497 | spi_mask_intr(dws, 0xff); |
552e4509 | 498 | if (imask) |
e24c7452 | 499 | spi_umask_intr(dws, imask); |
552e4509 | 500 | if (txint_level) |
7eb187b3 | 501 | dw_writew(dws, DW_SPI_TXFLTR, txint_level); |
e24c7452 | 502 | |
e24c7452 | 503 | spi_enable_chip(dws, 1); |
e24c7452 FT |
504 | if (cs_change) |
505 | dws->prev_chip = chip; | |
506 | } | |
507 | ||
508 | if (dws->dma_mapped) | |
7063c0d9 | 509 | dws->dma_ops->dma_transfer(dws, cs_change); |
e24c7452 FT |
510 | |
511 | if (chip->poll_mode) | |
512 | poll_transfer(dws); | |
513 | ||
514 | return; | |
515 | ||
516 | early_exit: | |
517 | giveback(dws); | |
518 | return; | |
519 | } | |
520 | ||
ec37e8e1 BS |
521 | static int dw_spi_transfer_one_message(struct spi_master *master, |
522 | struct spi_message *msg) | |
e24c7452 | 523 | { |
ec37e8e1 | 524 | struct dw_spi *dws = spi_master_get_devdata(master); |
e24c7452 | 525 | |
ec37e8e1 | 526 | dws->cur_msg = msg; |
e24c7452 FT |
527 | /* Initial message state*/ |
528 | dws->cur_msg->state = START_STATE; | |
529 | dws->cur_transfer = list_entry(dws->cur_msg->transfers.next, | |
530 | struct spi_transfer, | |
531 | transfer_list); | |
532 | dws->cur_chip = spi_get_ctldata(dws->cur_msg->spi); | |
533 | ||
ec37e8e1 | 534 | /* Launch transfers */ |
e24c7452 FT |
535 | tasklet_schedule(&dws->pump_transfers); |
536 | ||
e24c7452 FT |
537 | return 0; |
538 | } | |
539 | ||
540 | /* This may be called twice for each spi dev */ | |
541 | static int dw_spi_setup(struct spi_device *spi) | |
542 | { | |
543 | struct dw_spi_chip *chip_info = NULL; | |
544 | struct chip_data *chip; | |
d9c73bb8 | 545 | int ret; |
e24c7452 | 546 | |
e24c7452 FT |
547 | /* Only alloc on first setup */ |
548 | chip = spi_get_ctldata(spi); | |
549 | if (!chip) { | |
43f627ac BS |
550 | chip = devm_kzalloc(&spi->dev, sizeof(struct chip_data), |
551 | GFP_KERNEL); | |
e24c7452 FT |
552 | if (!chip) |
553 | return -ENOMEM; | |
43f627ac | 554 | spi_set_ctldata(spi, chip); |
e24c7452 FT |
555 | } |
556 | ||
557 | /* | |
558 | * Protocol drivers may change the chip settings, so... | |
559 | * if chip_info exists, use it | |
560 | */ | |
561 | chip_info = spi->controller_data; | |
562 | ||
563 | /* chip_info doesn't always exist */ | |
564 | if (chip_info) { | |
565 | if (chip_info->cs_control) | |
566 | chip->cs_control = chip_info->cs_control; | |
567 | ||
568 | chip->poll_mode = chip_info->poll_mode; | |
569 | chip->type = chip_info->type; | |
570 | ||
571 | chip->rx_threshold = 0; | |
572 | chip->tx_threshold = 0; | |
573 | ||
574 | chip->enable_dma = chip_info->enable_dma; | |
575 | } | |
576 | ||
24778be2 | 577 | if (spi->bits_per_word == 8) { |
e24c7452 FT |
578 | chip->n_bytes = 1; |
579 | chip->dma_width = 1; | |
24778be2 | 580 | } else if (spi->bits_per_word == 16) { |
e24c7452 FT |
581 | chip->n_bytes = 2; |
582 | chip->dma_width = 2; | |
e24c7452 FT |
583 | } |
584 | chip->bits_per_word = spi->bits_per_word; | |
585 | ||
552e4509 FT |
586 | if (!spi->max_speed_hz) { |
587 | dev_err(&spi->dev, "No max speed HZ parameter\n"); | |
588 | return -EINVAL; | |
589 | } | |
e24c7452 | 590 | chip->speed_hz = spi->max_speed_hz; |
e24c7452 FT |
591 | |
592 | chip->tmode = 0; /* Tx & Rx */ | |
593 | /* Default SPI mode is SCPOL = 0, SCPH = 0 */ | |
594 | chip->cr0 = (chip->bits_per_word - 1) | |
595 | | (chip->type << SPI_FRF_OFFSET) | |
596 | | (spi->mode << SPI_MODE_OFFSET) | |
597 | | (chip->tmode << SPI_TMOD_OFFSET); | |
598 | ||
d9c73bb8 BS |
599 | if (gpio_is_valid(spi->cs_gpio)) { |
600 | ret = gpio_direction_output(spi->cs_gpio, | |
601 | !(spi->mode & SPI_CS_HIGH)); | |
602 | if (ret) | |
603 | return ret; | |
604 | } | |
605 | ||
e24c7452 FT |
606 | return 0; |
607 | } | |
608 | ||
e24c7452 FT |
609 | /* Restart the controller, disable all interrupts, clean rx fifo */ |
610 | static void spi_hw_init(struct dw_spi *dws) | |
611 | { | |
612 | spi_enable_chip(dws, 0); | |
613 | spi_mask_intr(dws, 0xff); | |
614 | spi_enable_chip(dws, 1); | |
c587b6fa FT |
615 | |
616 | /* | |
617 | * Try to detect the FIFO depth if not set by interface driver, | |
618 | * the depth could be from 2 to 256 from HW spec | |
619 | */ | |
620 | if (!dws->fifo_len) { | |
621 | u32 fifo; | |
622 | for (fifo = 2; fifo <= 257; fifo++) { | |
7eb187b3 HS |
623 | dw_writew(dws, DW_SPI_TXFLTR, fifo); |
624 | if (fifo != dw_readw(dws, DW_SPI_TXFLTR)) | |
c587b6fa FT |
625 | break; |
626 | } | |
627 | ||
628 | dws->fifo_len = (fifo == 257) ? 0 : fifo; | |
7eb187b3 | 629 | dw_writew(dws, DW_SPI_TXFLTR, 0); |
c587b6fa | 630 | } |
e24c7452 FT |
631 | } |
632 | ||
04f421e7 | 633 | int dw_spi_add_host(struct device *dev, struct dw_spi *dws) |
e24c7452 FT |
634 | { |
635 | struct spi_master *master; | |
636 | int ret; | |
637 | ||
638 | BUG_ON(dws == NULL); | |
639 | ||
04f421e7 BS |
640 | master = spi_alloc_master(dev, 0); |
641 | if (!master) | |
642 | return -ENOMEM; | |
e24c7452 FT |
643 | |
644 | dws->master = master; | |
645 | dws->type = SSI_MOTO_SPI; | |
646 | dws->prev_chip = NULL; | |
647 | dws->dma_inited = 0; | |
648 | dws->dma_addr = (dma_addr_t)(dws->paddr + 0x60); | |
40bfff85 LS |
649 | snprintf(dws->name, sizeof(dws->name), "dw_spi%d", |
650 | dws->bus_num); | |
e24c7452 | 651 | |
04f421e7 | 652 | ret = devm_request_irq(dev, dws->irq, dw_spi_irq, IRQF_SHARED, |
40bfff85 | 653 | dws->name, dws); |
e24c7452 FT |
654 | if (ret < 0) { |
655 | dev_err(&master->dev, "can not get IRQ\n"); | |
656 | goto err_free_master; | |
657 | } | |
658 | ||
659 | master->mode_bits = SPI_CPOL | SPI_CPHA; | |
24778be2 | 660 | master->bits_per_word_mask = SPI_BPW_MASK(8) | SPI_BPW_MASK(16); |
e24c7452 FT |
661 | master->bus_num = dws->bus_num; |
662 | master->num_chipselect = dws->num_cs; | |
e24c7452 | 663 | master->setup = dw_spi_setup; |
ec37e8e1 | 664 | master->transfer_one_message = dw_spi_transfer_one_message; |
765ee709 | 665 | master->max_speed_hz = dws->max_freq; |
e24c7452 | 666 | |
e24c7452 FT |
667 | /* Basic HW init */ |
668 | spi_hw_init(dws); | |
669 | ||
7063c0d9 FT |
670 | if (dws->dma_ops && dws->dma_ops->dma_init) { |
671 | ret = dws->dma_ops->dma_init(dws); | |
672 | if (ret) { | |
673 | dev_warn(&master->dev, "DMA init failed\n"); | |
674 | dws->dma_inited = 0; | |
675 | } | |
676 | } | |
677 | ||
ec37e8e1 | 678 | tasklet_init(&dws->pump_transfers, pump_transfers, (unsigned long)dws); |
e24c7452 FT |
679 | |
680 | spi_master_set_devdata(master, dws); | |
04f421e7 | 681 | ret = devm_spi_register_master(dev, master); |
e24c7452 FT |
682 | if (ret) { |
683 | dev_err(&master->dev, "problem registering spi master\n"); | |
ec37e8e1 | 684 | goto err_dma_exit; |
e24c7452 FT |
685 | } |
686 | ||
687 | mrst_spi_debugfs_init(dws); | |
688 | return 0; | |
689 | ||
ec37e8e1 | 690 | err_dma_exit: |
7063c0d9 FT |
691 | if (dws->dma_ops && dws->dma_ops->dma_exit) |
692 | dws->dma_ops->dma_exit(dws); | |
e24c7452 | 693 | spi_enable_chip(dws, 0); |
e24c7452 FT |
694 | err_free_master: |
695 | spi_master_put(master); | |
e24c7452 FT |
696 | return ret; |
697 | } | |
79290a2a | 698 | EXPORT_SYMBOL_GPL(dw_spi_add_host); |
e24c7452 | 699 | |
fd4a319b | 700 | void dw_spi_remove_host(struct dw_spi *dws) |
e24c7452 | 701 | { |
e24c7452 FT |
702 | if (!dws) |
703 | return; | |
704 | mrst_spi_debugfs_remove(dws); | |
705 | ||
7063c0d9 FT |
706 | if (dws->dma_ops && dws->dma_ops->dma_exit) |
707 | dws->dma_ops->dma_exit(dws); | |
e24c7452 FT |
708 | spi_enable_chip(dws, 0); |
709 | /* Disable clk */ | |
710 | spi_set_clk(dws, 0); | |
e24c7452 | 711 | } |
79290a2a | 712 | EXPORT_SYMBOL_GPL(dw_spi_remove_host); |
e24c7452 FT |
713 | |
714 | int dw_spi_suspend_host(struct dw_spi *dws) | |
715 | { | |
716 | int ret = 0; | |
717 | ||
ec37e8e1 | 718 | ret = spi_master_suspend(dws->master); |
e24c7452 FT |
719 | if (ret) |
720 | return ret; | |
721 | spi_enable_chip(dws, 0); | |
722 | spi_set_clk(dws, 0); | |
723 | return ret; | |
724 | } | |
79290a2a | 725 | EXPORT_SYMBOL_GPL(dw_spi_suspend_host); |
e24c7452 FT |
726 | |
727 | int dw_spi_resume_host(struct dw_spi *dws) | |
728 | { | |
729 | int ret; | |
730 | ||
731 | spi_hw_init(dws); | |
ec37e8e1 | 732 | ret = spi_master_resume(dws->master); |
e24c7452 FT |
733 | if (ret) |
734 | dev_err(&dws->master->dev, "fail to start queue (%d)\n", ret); | |
735 | return ret; | |
736 | } | |
79290a2a | 737 | EXPORT_SYMBOL_GPL(dw_spi_resume_host); |
e24c7452 FT |
738 | |
739 | MODULE_AUTHOR("Feng Tang <feng.tang@intel.com>"); | |
740 | MODULE_DESCRIPTION("Driver for DesignWare SPI controller core"); | |
741 | MODULE_LICENSE("GPL v2"); |