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3bfb1d20 HS |
1 | /* |
2 | * Driver for the Synopsys DesignWare AHB DMA Controller | |
3 | * | |
4 | * Copyright (C) 2005-2007 Atmel Corporation | |
aecb7b64 | 5 | * Copyright (C) 2010-2011 ST Microelectronics |
3bfb1d20 HS |
6 | * |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/dw_dmac.h> | |
13 | ||
14 | #define DW_DMA_MAX_NR_CHANNELS 8 | |
15 | ||
16 | /* | |
17 | * Redefine this macro to handle differences between 32- and 64-bit | |
18 | * addressing, big vs. little endian, etc. | |
19 | */ | |
20 | #define DW_REG(name) u32 name; u32 __pad_##name | |
21 | ||
22 | /* Hardware register definitions. */ | |
23 | struct dw_dma_chan_regs { | |
24 | DW_REG(SAR); /* Source Address Register */ | |
25 | DW_REG(DAR); /* Destination Address Register */ | |
26 | DW_REG(LLP); /* Linked List Pointer */ | |
27 | u32 CTL_LO; /* Control Register Low */ | |
28 | u32 CTL_HI; /* Control Register High */ | |
29 | DW_REG(SSTAT); | |
30 | DW_REG(DSTAT); | |
31 | DW_REG(SSTATAR); | |
32 | DW_REG(DSTATAR); | |
33 | u32 CFG_LO; /* Configuration Register Low */ | |
34 | u32 CFG_HI; /* Configuration Register High */ | |
35 | DW_REG(SGR); | |
36 | DW_REG(DSR); | |
37 | }; | |
38 | ||
39 | struct dw_dma_irq_regs { | |
40 | DW_REG(XFER); | |
41 | DW_REG(BLOCK); | |
42 | DW_REG(SRC_TRAN); | |
43 | DW_REG(DST_TRAN); | |
44 | DW_REG(ERROR); | |
45 | }; | |
46 | ||
47 | struct dw_dma_regs { | |
48 | /* per-channel registers */ | |
49 | struct dw_dma_chan_regs CHAN[DW_DMA_MAX_NR_CHANNELS]; | |
50 | ||
51 | /* irq handling */ | |
52 | struct dw_dma_irq_regs RAW; /* r */ | |
53 | struct dw_dma_irq_regs STATUS; /* r (raw & mask) */ | |
54 | struct dw_dma_irq_regs MASK; /* rw (set = irq enabled) */ | |
55 | struct dw_dma_irq_regs CLEAR; /* w (ack, affects "raw") */ | |
56 | ||
57 | DW_REG(STATUS_INT); /* r */ | |
58 | ||
59 | /* software handshaking */ | |
60 | DW_REG(REQ_SRC); | |
61 | DW_REG(REQ_DST); | |
62 | DW_REG(SGL_REQ_SRC); | |
63 | DW_REG(SGL_REQ_DST); | |
64 | DW_REG(LAST_SRC); | |
65 | DW_REG(LAST_DST); | |
66 | ||
67 | /* miscellaneous */ | |
68 | DW_REG(CFG); | |
69 | DW_REG(CH_EN); | |
70 | DW_REG(ID); | |
71 | DW_REG(TEST); | |
72 | ||
73 | /* optional encoded params, 0x3c8..0x3 */ | |
74 | }; | |
75 | ||
76 | /* Bitfields in CTL_LO */ | |
77 | #define DWC_CTLL_INT_EN (1 << 0) /* irqs enabled? */ | |
78 | #define DWC_CTLL_DST_WIDTH(n) ((n)<<1) /* bytes per element */ | |
79 | #define DWC_CTLL_SRC_WIDTH(n) ((n)<<4) | |
80 | #define DWC_CTLL_DST_INC (0<<7) /* DAR update/not */ | |
81 | #define DWC_CTLL_DST_DEC (1<<7) | |
82 | #define DWC_CTLL_DST_FIX (2<<7) | |
83 | #define DWC_CTLL_SRC_INC (0<<7) /* SAR update/not */ | |
84 | #define DWC_CTLL_SRC_DEC (1<<9) | |
85 | #define DWC_CTLL_SRC_FIX (2<<9) | |
86 | #define DWC_CTLL_DST_MSIZE(n) ((n)<<11) /* burst, #elements */ | |
87 | #define DWC_CTLL_SRC_MSIZE(n) ((n)<<14) | |
88 | #define DWC_CTLL_S_GATH_EN (1 << 17) /* src gather, !FIX */ | |
89 | #define DWC_CTLL_D_SCAT_EN (1 << 18) /* dst scatter, !FIX */ | |
ee66509d | 90 | #define DWC_CTLL_FC(n) ((n) << 20) |
3bfb1d20 HS |
91 | #define DWC_CTLL_FC_M2M (0 << 20) /* mem-to-mem */ |
92 | #define DWC_CTLL_FC_M2P (1 << 20) /* mem-to-periph */ | |
93 | #define DWC_CTLL_FC_P2M (2 << 20) /* periph-to-mem */ | |
94 | #define DWC_CTLL_FC_P2P (3 << 20) /* periph-to-periph */ | |
95 | /* plus 4 transfer types for peripheral-as-flow-controller */ | |
96 | #define DWC_CTLL_DMS(n) ((n)<<23) /* dst master select */ | |
97 | #define DWC_CTLL_SMS(n) ((n)<<25) /* src master select */ | |
98 | #define DWC_CTLL_LLP_D_EN (1 << 27) /* dest block chain */ | |
99 | #define DWC_CTLL_LLP_S_EN (1 << 28) /* src block chain */ | |
100 | ||
101 | /* Bitfields in CTL_HI */ | |
102 | #define DWC_CTLH_DONE 0x00001000 | |
103 | #define DWC_CTLH_BLOCK_TS_MASK 0x00000fff | |
104 | ||
105 | /* Bitfields in CFG_LO. Platform-configurable bits are in <linux/dw_dmac.h> */ | |
93317e8e VK |
106 | #define DWC_CFGL_CH_PRIOR_MASK (0x7 << 5) /* priority mask */ |
107 | #define DWC_CFGL_CH_PRIOR(x) ((x) << 5) /* priority */ | |
3bfb1d20 HS |
108 | #define DWC_CFGL_CH_SUSP (1 << 8) /* pause xfer */ |
109 | #define DWC_CFGL_FIFO_EMPTY (1 << 9) /* pause xfer */ | |
110 | #define DWC_CFGL_HS_DST (1 << 10) /* handshake w/dst */ | |
111 | #define DWC_CFGL_HS_SRC (1 << 11) /* handshake w/src */ | |
112 | #define DWC_CFGL_MAX_BURST(x) ((x) << 20) | |
113 | #define DWC_CFGL_RELOAD_SAR (1 << 30) | |
114 | #define DWC_CFGL_RELOAD_DAR (1 << 31) | |
115 | ||
116 | /* Bitfields in CFG_HI. Platform-configurable bits are in <linux/dw_dmac.h> */ | |
117 | #define DWC_CFGH_DS_UPD_EN (1 << 5) | |
118 | #define DWC_CFGH_SS_UPD_EN (1 << 6) | |
119 | ||
120 | /* Bitfields in SGR */ | |
121 | #define DWC_SGR_SGI(x) ((x) << 0) | |
122 | #define DWC_SGR_SGC(x) ((x) << 20) | |
123 | ||
124 | /* Bitfields in DSR */ | |
125 | #define DWC_DSR_DSI(x) ((x) << 0) | |
126 | #define DWC_DSR_DSC(x) ((x) << 20) | |
127 | ||
128 | /* Bitfields in CFG */ | |
129 | #define DW_CFG_DMA_EN (1 << 0) | |
130 | ||
131 | #define DW_REGLEN 0x400 | |
132 | ||
d9de4519 HCE |
133 | enum dw_dmac_flags { |
134 | DW_DMA_IS_CYCLIC = 0, | |
135 | }; | |
136 | ||
3bfb1d20 HS |
137 | struct dw_dma_chan { |
138 | struct dma_chan chan; | |
139 | void __iomem *ch_regs; | |
140 | u8 mask; | |
93317e8e | 141 | u8 priority; |
a7c57cf7 | 142 | bool paused; |
3bfb1d20 HS |
143 | |
144 | spinlock_t lock; | |
145 | ||
146 | /* these other elements are all protected by lock */ | |
d9de4519 | 147 | unsigned long flags; |
3bfb1d20 HS |
148 | dma_cookie_t completed; |
149 | struct list_head active_list; | |
150 | struct list_head queue; | |
151 | struct list_head free_list; | |
d9de4519 | 152 | struct dw_cyclic_desc *cdesc; |
3bfb1d20 | 153 | |
3bfb1d20 HS |
154 | unsigned int descs_allocated; |
155 | }; | |
156 | ||
157 | static inline struct dw_dma_chan_regs __iomem * | |
158 | __dwc_regs(struct dw_dma_chan *dwc) | |
159 | { | |
160 | return dwc->ch_regs; | |
161 | } | |
162 | ||
163 | #define channel_readl(dwc, name) \ | |
29782da5 | 164 | readl(&(__dwc_regs(dwc)->name)) |
3bfb1d20 | 165 | #define channel_writel(dwc, name, val) \ |
29782da5 | 166 | writel((val), &(__dwc_regs(dwc)->name)) |
3bfb1d20 HS |
167 | |
168 | static inline struct dw_dma_chan *to_dw_dma_chan(struct dma_chan *chan) | |
169 | { | |
170 | return container_of(chan, struct dw_dma_chan, chan); | |
171 | } | |
172 | ||
3bfb1d20 HS |
173 | struct dw_dma { |
174 | struct dma_device dma; | |
175 | void __iomem *regs; | |
176 | struct tasklet_struct tasklet; | |
177 | struct clk *clk; | |
178 | ||
179 | u8 all_chan_mask; | |
180 | ||
181 | struct dw_dma_chan chan[0]; | |
182 | }; | |
183 | ||
184 | static inline struct dw_dma_regs __iomem *__dw_regs(struct dw_dma *dw) | |
185 | { | |
186 | return dw->regs; | |
187 | } | |
188 | ||
189 | #define dma_readl(dw, name) \ | |
29782da5 | 190 | readl(&(__dw_regs(dw)->name)) |
3bfb1d20 | 191 | #define dma_writel(dw, name, val) \ |
29782da5 | 192 | writel((val), &(__dw_regs(dw)->name)) |
3bfb1d20 HS |
193 | |
194 | #define channel_set_bit(dw, reg, mask) \ | |
195 | dma_writel(dw, reg, ((mask) << 8) | (mask)) | |
196 | #define channel_clear_bit(dw, reg, mask) \ | |
197 | dma_writel(dw, reg, ((mask) << 8) | 0) | |
198 | ||
199 | static inline struct dw_dma *to_dw_dma(struct dma_device *ddev) | |
200 | { | |
201 | return container_of(ddev, struct dw_dma, dma); | |
202 | } | |
203 | ||
204 | /* LLI == Linked List Item; a.k.a. DMA block descriptor */ | |
205 | struct dw_lli { | |
206 | /* values that are not changed by hardware */ | |
207 | dma_addr_t sar; | |
208 | dma_addr_t dar; | |
209 | dma_addr_t llp; /* chain to next lli */ | |
210 | u32 ctllo; | |
211 | /* values that may get written back: */ | |
212 | u32 ctlhi; | |
213 | /* sstat and dstat can snapshot peripheral register state. | |
214 | * silicon config may discard either or both... | |
215 | */ | |
216 | u32 sstat; | |
217 | u32 dstat; | |
218 | }; | |
219 | ||
220 | struct dw_desc { | |
221 | /* FIRST values the hardware uses */ | |
222 | struct dw_lli lli; | |
223 | ||
224 | /* THEN values for driver housekeeping */ | |
225 | struct list_head desc_node; | |
e0bd0f8c | 226 | struct list_head tx_list; |
3bfb1d20 HS |
227 | struct dma_async_tx_descriptor txd; |
228 | size_t len; | |
229 | }; | |
230 | ||
231 | static inline struct dw_desc * | |
232 | txd_to_dw_desc(struct dma_async_tx_descriptor *txd) | |
233 | { | |
234 | return container_of(txd, struct dw_desc, txd); | |
235 | } |