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bfe645ad AH |
1 | /* linux/arch/arm/mach-msm/dma.c |
2 | * | |
3 | * Copyright (C) 2007 Google, Inc. | |
4 | * | |
5 | * This software is licensed under the terms of the GNU General Public | |
6 | * License version 2, as published by the Free Software Foundation, and | |
7 | * may be copied, distributed, and modified under those terms. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | */ | |
15 | ||
c5541079 AH |
16 | #include <linux/clk.h> |
17 | #include <linux/err.h> | |
fced80c7 | 18 | #include <linux/io.h> |
bfe645ad | 19 | #include <linux/interrupt.h> |
6d7b7d57 | 20 | #include <linux/completion.h> |
a09e64fb | 21 | #include <mach/dma.h> |
430f1eef | 22 | #include <mach/msm_iomap.h> |
bfe645ad AH |
23 | |
24 | #define MSM_DMOV_CHANNEL_COUNT 16 | |
25 | ||
430f1eef SB |
26 | #define DMOV_SD0(off, ch) (MSM_DMOV_BASE + 0x0000 + (off) + ((ch) << 2)) |
27 | #define DMOV_SD1(off, ch) (MSM_DMOV_BASE + 0x0400 + (off) + ((ch) << 2)) | |
28 | #define DMOV_SD2(off, ch) (MSM_DMOV_BASE + 0x0800 + (off) + ((ch) << 2)) | |
29 | #define DMOV_SD3(off, ch) (MSM_DMOV_BASE + 0x0C00 + (off) + ((ch) << 2)) | |
30 | ||
31 | #if defined(CONFIG_ARCH_MSM7X30) | |
32 | #define DMOV_SD_AARM DMOV_SD2 | |
33 | #else | |
34 | #define DMOV_SD_AARM DMOV_SD3 | |
35 | #endif | |
36 | ||
37 | #define DMOV_CMD_PTR(ch) DMOV_SD_AARM(0x000, ch) | |
38 | #define DMOV_RSLT(ch) DMOV_SD_AARM(0x040, ch) | |
39 | #define DMOV_FLUSH0(ch) DMOV_SD_AARM(0x080, ch) | |
40 | #define DMOV_FLUSH1(ch) DMOV_SD_AARM(0x0C0, ch) | |
41 | #define DMOV_FLUSH2(ch) DMOV_SD_AARM(0x100, ch) | |
42 | #define DMOV_FLUSH3(ch) DMOV_SD_AARM(0x140, ch) | |
43 | #define DMOV_FLUSH4(ch) DMOV_SD_AARM(0x180, ch) | |
44 | #define DMOV_FLUSH5(ch) DMOV_SD_AARM(0x1C0, ch) | |
45 | ||
46 | #define DMOV_STATUS(ch) DMOV_SD_AARM(0x200, ch) | |
47 | #define DMOV_ISR DMOV_SD_AARM(0x380, 0) | |
48 | ||
49 | #define DMOV_CONFIG(ch) DMOV_SD_AARM(0x300, ch) | |
50 | ||
bfe645ad AH |
51 | enum { |
52 | MSM_DMOV_PRINT_ERRORS = 1, | |
53 | MSM_DMOV_PRINT_IO = 2, | |
54 | MSM_DMOV_PRINT_FLOW = 4 | |
55 | }; | |
56 | ||
57 | static DEFINE_SPINLOCK(msm_dmov_lock); | |
c5541079 | 58 | static struct clk *msm_dmov_clk; |
8a0f6f17 | 59 | static unsigned int channel_active; |
bfe645ad AH |
60 | static struct list_head ready_commands[MSM_DMOV_CHANNEL_COUNT]; |
61 | static struct list_head active_commands[MSM_DMOV_CHANNEL_COUNT]; | |
62 | unsigned int msm_dmov_print_mask = MSM_DMOV_PRINT_ERRORS; | |
63 | ||
64 | #define MSM_DMOV_DPRINTF(mask, format, args...) \ | |
65 | do { \ | |
66 | if ((mask) & msm_dmov_print_mask) \ | |
67 | printk(KERN_ERR format, args); \ | |
68 | } while (0) | |
69 | #define PRINT_ERROR(format, args...) \ | |
70 | MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_ERRORS, format, args); | |
71 | #define PRINT_IO(format, args...) \ | |
72 | MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_IO, format, args); | |
73 | #define PRINT_FLOW(format, args...) \ | |
74 | MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_FLOW, format, args); | |
75 | ||
8a0f6f17 BS |
76 | void msm_dmov_stop_cmd(unsigned id, struct msm_dmov_cmd *cmd, int graceful) |
77 | { | |
78 | writel((graceful << 31), DMOV_FLUSH0(id)); | |
79 | } | |
80 | ||
bfe645ad AH |
81 | void msm_dmov_enqueue_cmd(unsigned id, struct msm_dmov_cmd *cmd) |
82 | { | |
83 | unsigned long irq_flags; | |
84 | unsigned int status; | |
85 | ||
86 | spin_lock_irqsave(&msm_dmov_lock, irq_flags); | |
c5541079 AH |
87 | if (!channel_active) |
88 | clk_enable(msm_dmov_clk); | |
9f68fcdb | 89 | dsb(); |
bfe645ad AH |
90 | status = readl(DMOV_STATUS(id)); |
91 | if (list_empty(&ready_commands[id]) && | |
92 | (status & DMOV_STATUS_CMD_PTR_RDY)) { | |
93 | #if 0 | |
94 | if (list_empty(&active_commands[id])) { | |
95 | PRINT_FLOW("msm_dmov_enqueue_cmd(%d), enable interrupt\n", id); | |
96 | writel(DMOV_CONFIG_IRQ_EN, DMOV_CONFIG(id)); | |
97 | } | |
98 | #endif | |
5b00f40f SM |
99 | if (cmd->execute_func) |
100 | cmd->execute_func(cmd); | |
bfe645ad AH |
101 | PRINT_IO("msm_dmov_enqueue_cmd(%d), start command, status %x\n", id, status); |
102 | list_add_tail(&cmd->list, &active_commands[id]); | |
8a0f6f17 BS |
103 | if (!channel_active) |
104 | enable_irq(INT_ADM_AARM); | |
105 | channel_active |= 1U << id; | |
bfe645ad AH |
106 | writel(cmd->cmdptr, DMOV_CMD_PTR(id)); |
107 | } else { | |
c5541079 AH |
108 | if (!channel_active) |
109 | clk_disable(msm_dmov_clk); | |
bfe645ad AH |
110 | if (list_empty(&active_commands[id])) |
111 | PRINT_ERROR("msm_dmov_enqueue_cmd(%d), error datamover stalled, status %x\n", id, status); | |
112 | ||
113 | PRINT_IO("msm_dmov_enqueue_cmd(%d), enqueue command, status %x\n", id, status); | |
114 | list_add_tail(&cmd->list, &ready_commands[id]); | |
115 | } | |
116 | spin_unlock_irqrestore(&msm_dmov_lock, irq_flags); | |
117 | } | |
118 | ||
119 | struct msm_dmov_exec_cmdptr_cmd { | |
120 | struct msm_dmov_cmd dmov_cmd; | |
121 | struct completion complete; | |
122 | unsigned id; | |
123 | unsigned int result; | |
8a0f6f17 | 124 | struct msm_dmov_errdata err; |
bfe645ad AH |
125 | }; |
126 | ||
8a0f6f17 BS |
127 | static void |
128 | dmov_exec_cmdptr_complete_func(struct msm_dmov_cmd *_cmd, | |
129 | unsigned int result, | |
130 | struct msm_dmov_errdata *err) | |
bfe645ad AH |
131 | { |
132 | struct msm_dmov_exec_cmdptr_cmd *cmd = container_of(_cmd, struct msm_dmov_exec_cmdptr_cmd, dmov_cmd); | |
133 | cmd->result = result; | |
8a0f6f17 BS |
134 | if (result != 0x80000002 && err) |
135 | memcpy(&cmd->err, err, sizeof(struct msm_dmov_errdata)); | |
136 | ||
bfe645ad AH |
137 | complete(&cmd->complete); |
138 | } | |
139 | ||
140 | int msm_dmov_exec_cmd(unsigned id, unsigned int cmdptr) | |
141 | { | |
142 | struct msm_dmov_exec_cmdptr_cmd cmd; | |
143 | ||
144 | PRINT_FLOW("dmov_exec_cmdptr(%d, %x)\n", id, cmdptr); | |
145 | ||
146 | cmd.dmov_cmd.cmdptr = cmdptr; | |
147 | cmd.dmov_cmd.complete_func = dmov_exec_cmdptr_complete_func; | |
5b00f40f | 148 | cmd.dmov_cmd.execute_func = NULL; |
bfe645ad AH |
149 | cmd.id = id; |
150 | init_completion(&cmd.complete); | |
151 | ||
152 | msm_dmov_enqueue_cmd(id, &cmd.dmov_cmd); | |
153 | wait_for_completion(&cmd.complete); | |
154 | ||
155 | if (cmd.result != 0x80000002) { | |
156 | PRINT_ERROR("dmov_exec_cmdptr(%d): ERROR, result: %x\n", id, cmd.result); | |
157 | PRINT_ERROR("dmov_exec_cmdptr(%d): flush: %x %x %x %x\n", | |
8a0f6f17 | 158 | id, cmd.err.flush[0], cmd.err.flush[1], cmd.err.flush[2], cmd.err.flush[3]); |
bfe645ad AH |
159 | return -EIO; |
160 | } | |
161 | PRINT_FLOW("dmov_exec_cmdptr(%d, %x) done\n", id, cmdptr); | |
162 | return 0; | |
163 | } | |
164 | ||
165 | ||
166 | static irqreturn_t msm_datamover_irq_handler(int irq, void *dev_id) | |
167 | { | |
168 | unsigned int int_status, mask, id; | |
169 | unsigned long irq_flags; | |
170 | unsigned int ch_status; | |
171 | unsigned int ch_result; | |
172 | struct msm_dmov_cmd *cmd; | |
173 | ||
174 | spin_lock_irqsave(&msm_dmov_lock, irq_flags); | |
175 | ||
176 | int_status = readl(DMOV_ISR); /* read and clear interrupt */ | |
177 | PRINT_FLOW("msm_datamover_irq_handler: DMOV_ISR %x\n", int_status); | |
178 | ||
179 | while (int_status) { | |
180 | mask = int_status & -int_status; | |
181 | id = fls(mask) - 1; | |
182 | PRINT_FLOW("msm_datamover_irq_handler %08x %08x id %d\n", int_status, mask, id); | |
183 | int_status &= ~mask; | |
184 | ch_status = readl(DMOV_STATUS(id)); | |
185 | if (!(ch_status & DMOV_STATUS_RSLT_VALID)) { | |
186 | PRINT_FLOW("msm_datamover_irq_handler id %d, result not valid %x\n", id, ch_status); | |
187 | continue; | |
188 | } | |
189 | do { | |
190 | ch_result = readl(DMOV_RSLT(id)); | |
191 | if (list_empty(&active_commands[id])) { | |
192 | PRINT_ERROR("msm_datamover_irq_handler id %d, got result " | |
193 | "with no active command, status %x, result %x\n", | |
194 | id, ch_status, ch_result); | |
195 | cmd = NULL; | |
196 | } else | |
197 | cmd = list_entry(active_commands[id].next, typeof(*cmd), list); | |
198 | PRINT_FLOW("msm_datamover_irq_handler id %d, status %x, result %x\n", id, ch_status, ch_result); | |
199 | if (ch_result & DMOV_RSLT_DONE) { | |
200 | PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", | |
201 | id, ch_status); | |
202 | PRINT_IO("msm_datamover_irq_handler id %d, got result " | |
203 | "for %p, result %x\n", id, cmd, ch_result); | |
204 | if (cmd) { | |
205 | list_del(&cmd->list); | |
9f68fcdb | 206 | dsb(); |
8a0f6f17 | 207 | cmd->complete_func(cmd, ch_result, NULL); |
bfe645ad AH |
208 | } |
209 | } | |
210 | if (ch_result & DMOV_RSLT_FLUSH) { | |
8a0f6f17 BS |
211 | struct msm_dmov_errdata errdata; |
212 | ||
213 | errdata.flush[0] = readl(DMOV_FLUSH0(id)); | |
214 | errdata.flush[1] = readl(DMOV_FLUSH1(id)); | |
215 | errdata.flush[2] = readl(DMOV_FLUSH2(id)); | |
216 | errdata.flush[3] = readl(DMOV_FLUSH3(id)); | |
217 | errdata.flush[4] = readl(DMOV_FLUSH4(id)); | |
218 | errdata.flush[5] = readl(DMOV_FLUSH5(id)); | |
bfe645ad | 219 | PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status); |
8a0f6f17 | 220 | PRINT_FLOW("msm_datamover_irq_handler id %d, flush, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]); |
bfe645ad AH |
221 | if (cmd) { |
222 | list_del(&cmd->list); | |
9f68fcdb | 223 | dsb(); |
8a0f6f17 | 224 | cmd->complete_func(cmd, ch_result, &errdata); |
bfe645ad AH |
225 | } |
226 | } | |
227 | if (ch_result & DMOV_RSLT_ERROR) { | |
8a0f6f17 BS |
228 | struct msm_dmov_errdata errdata; |
229 | ||
230 | errdata.flush[0] = readl(DMOV_FLUSH0(id)); | |
231 | errdata.flush[1] = readl(DMOV_FLUSH1(id)); | |
232 | errdata.flush[2] = readl(DMOV_FLUSH2(id)); | |
233 | errdata.flush[3] = readl(DMOV_FLUSH3(id)); | |
234 | errdata.flush[4] = readl(DMOV_FLUSH4(id)); | |
235 | errdata.flush[5] = readl(DMOV_FLUSH5(id)); | |
236 | ||
bfe645ad | 237 | PRINT_ERROR("msm_datamover_irq_handler id %d, status %x\n", id, ch_status); |
8a0f6f17 | 238 | PRINT_ERROR("msm_datamover_irq_handler id %d, error, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]); |
bfe645ad AH |
239 | if (cmd) { |
240 | list_del(&cmd->list); | |
9f68fcdb | 241 | dsb(); |
8a0f6f17 | 242 | cmd->complete_func(cmd, ch_result, &errdata); |
bfe645ad AH |
243 | } |
244 | /* this does not seem to work, once we get an error */ | |
245 | /* the datamover will no longer accept commands */ | |
246 | writel(0, DMOV_FLUSH0(id)); | |
247 | } | |
248 | ch_status = readl(DMOV_STATUS(id)); | |
249 | PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status); | |
250 | if ((ch_status & DMOV_STATUS_CMD_PTR_RDY) && !list_empty(&ready_commands[id])) { | |
251 | cmd = list_entry(ready_commands[id].next, typeof(*cmd), list); | |
6eebf2de | 252 | list_move_tail(&cmd->list, &active_commands[id]); |
5b00f40f SM |
253 | if (cmd->execute_func) |
254 | cmd->execute_func(cmd); | |
bfe645ad AH |
255 | PRINT_FLOW("msm_datamover_irq_handler id %d, start command\n", id); |
256 | writel(cmd->cmdptr, DMOV_CMD_PTR(id)); | |
257 | } | |
258 | } while (ch_status & DMOV_STATUS_RSLT_VALID); | |
8a0f6f17 BS |
259 | if (list_empty(&active_commands[id]) && list_empty(&ready_commands[id])) |
260 | channel_active &= ~(1U << id); | |
bfe645ad AH |
261 | PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status); |
262 | } | |
8a0f6f17 | 263 | |
c5541079 | 264 | if (!channel_active) { |
a6407dd7 | 265 | disable_irq_nosync(INT_ADM_AARM); |
c5541079 AH |
266 | clk_disable(msm_dmov_clk); |
267 | } | |
8a0f6f17 | 268 | |
bfe645ad AH |
269 | spin_unlock_irqrestore(&msm_dmov_lock, irq_flags); |
270 | return IRQ_HANDLED; | |
271 | } | |
272 | ||
273 | static int __init msm_init_datamover(void) | |
274 | { | |
275 | int i; | |
8a0f6f17 | 276 | int ret; |
c5541079 AH |
277 | struct clk *clk; |
278 | ||
bfe645ad AH |
279 | for (i = 0; i < MSM_DMOV_CHANNEL_COUNT; i++) { |
280 | INIT_LIST_HEAD(&ready_commands[i]); | |
281 | INIT_LIST_HEAD(&active_commands[i]); | |
282 | writel(DMOV_CONFIG_IRQ_EN | DMOV_CONFIG_FORCE_TOP_PTR_RSLT | DMOV_CONFIG_FORCE_FLUSH_RSLT, DMOV_CONFIG(i)); | |
283 | } | |
c5541079 AH |
284 | clk = clk_get(NULL, "adm_clk"); |
285 | if (IS_ERR(clk)) | |
286 | return PTR_ERR(clk); | |
2dfd9c1f | 287 | clk_prepare(clk); |
c5541079 | 288 | msm_dmov_clk = clk; |
8a0f6f17 BS |
289 | ret = request_irq(INT_ADM_AARM, msm_datamover_irq_handler, 0, "msmdatamover", NULL); |
290 | if (ret) | |
291 | return ret; | |
292 | disable_irq(INT_ADM_AARM); | |
293 | return 0; | |
bfe645ad | 294 | } |
2dfd9c1f | 295 | module_init(msm_init_datamover); |