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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> |
bfe645ad AH |
22 | |
23 | #define MSM_DMOV_CHANNEL_COUNT 16 | |
24 | ||
25 | enum { | |
26 | MSM_DMOV_PRINT_ERRORS = 1, | |
27 | MSM_DMOV_PRINT_IO = 2, | |
28 | MSM_DMOV_PRINT_FLOW = 4 | |
29 | }; | |
30 | ||
31 | static DEFINE_SPINLOCK(msm_dmov_lock); | |
c5541079 | 32 | static struct clk *msm_dmov_clk; |
8a0f6f17 | 33 | static unsigned int channel_active; |
bfe645ad AH |
34 | static struct list_head ready_commands[MSM_DMOV_CHANNEL_COUNT]; |
35 | static struct list_head active_commands[MSM_DMOV_CHANNEL_COUNT]; | |
36 | unsigned int msm_dmov_print_mask = MSM_DMOV_PRINT_ERRORS; | |
37 | ||
38 | #define MSM_DMOV_DPRINTF(mask, format, args...) \ | |
39 | do { \ | |
40 | if ((mask) & msm_dmov_print_mask) \ | |
41 | printk(KERN_ERR format, args); \ | |
42 | } while (0) | |
43 | #define PRINT_ERROR(format, args...) \ | |
44 | MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_ERRORS, format, args); | |
45 | #define PRINT_IO(format, args...) \ | |
46 | MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_IO, format, args); | |
47 | #define PRINT_FLOW(format, args...) \ | |
48 | MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_FLOW, format, args); | |
49 | ||
8a0f6f17 BS |
50 | void msm_dmov_stop_cmd(unsigned id, struct msm_dmov_cmd *cmd, int graceful) |
51 | { | |
52 | writel((graceful << 31), DMOV_FLUSH0(id)); | |
53 | } | |
54 | ||
bfe645ad AH |
55 | void msm_dmov_enqueue_cmd(unsigned id, struct msm_dmov_cmd *cmd) |
56 | { | |
57 | unsigned long irq_flags; | |
58 | unsigned int status; | |
59 | ||
60 | spin_lock_irqsave(&msm_dmov_lock, irq_flags); | |
c5541079 AH |
61 | if (!channel_active) |
62 | clk_enable(msm_dmov_clk); | |
9f68fcdb | 63 | dsb(); |
bfe645ad AH |
64 | status = readl(DMOV_STATUS(id)); |
65 | if (list_empty(&ready_commands[id]) && | |
66 | (status & DMOV_STATUS_CMD_PTR_RDY)) { | |
67 | #if 0 | |
68 | if (list_empty(&active_commands[id])) { | |
69 | PRINT_FLOW("msm_dmov_enqueue_cmd(%d), enable interrupt\n", id); | |
70 | writel(DMOV_CONFIG_IRQ_EN, DMOV_CONFIG(id)); | |
71 | } | |
72 | #endif | |
5b00f40f SM |
73 | if (cmd->execute_func) |
74 | cmd->execute_func(cmd); | |
bfe645ad AH |
75 | PRINT_IO("msm_dmov_enqueue_cmd(%d), start command, status %x\n", id, status); |
76 | list_add_tail(&cmd->list, &active_commands[id]); | |
8a0f6f17 BS |
77 | if (!channel_active) |
78 | enable_irq(INT_ADM_AARM); | |
79 | channel_active |= 1U << id; | |
bfe645ad AH |
80 | writel(cmd->cmdptr, DMOV_CMD_PTR(id)); |
81 | } else { | |
c5541079 AH |
82 | if (!channel_active) |
83 | clk_disable(msm_dmov_clk); | |
bfe645ad AH |
84 | if (list_empty(&active_commands[id])) |
85 | PRINT_ERROR("msm_dmov_enqueue_cmd(%d), error datamover stalled, status %x\n", id, status); | |
86 | ||
87 | PRINT_IO("msm_dmov_enqueue_cmd(%d), enqueue command, status %x\n", id, status); | |
88 | list_add_tail(&cmd->list, &ready_commands[id]); | |
89 | } | |
90 | spin_unlock_irqrestore(&msm_dmov_lock, irq_flags); | |
91 | } | |
92 | ||
93 | struct msm_dmov_exec_cmdptr_cmd { | |
94 | struct msm_dmov_cmd dmov_cmd; | |
95 | struct completion complete; | |
96 | unsigned id; | |
97 | unsigned int result; | |
8a0f6f17 | 98 | struct msm_dmov_errdata err; |
bfe645ad AH |
99 | }; |
100 | ||
8a0f6f17 BS |
101 | static void |
102 | dmov_exec_cmdptr_complete_func(struct msm_dmov_cmd *_cmd, | |
103 | unsigned int result, | |
104 | struct msm_dmov_errdata *err) | |
bfe645ad AH |
105 | { |
106 | struct msm_dmov_exec_cmdptr_cmd *cmd = container_of(_cmd, struct msm_dmov_exec_cmdptr_cmd, dmov_cmd); | |
107 | cmd->result = result; | |
8a0f6f17 BS |
108 | if (result != 0x80000002 && err) |
109 | memcpy(&cmd->err, err, sizeof(struct msm_dmov_errdata)); | |
110 | ||
bfe645ad AH |
111 | complete(&cmd->complete); |
112 | } | |
113 | ||
114 | int msm_dmov_exec_cmd(unsigned id, unsigned int cmdptr) | |
115 | { | |
116 | struct msm_dmov_exec_cmdptr_cmd cmd; | |
117 | ||
118 | PRINT_FLOW("dmov_exec_cmdptr(%d, %x)\n", id, cmdptr); | |
119 | ||
120 | cmd.dmov_cmd.cmdptr = cmdptr; | |
121 | cmd.dmov_cmd.complete_func = dmov_exec_cmdptr_complete_func; | |
5b00f40f | 122 | cmd.dmov_cmd.execute_func = NULL; |
bfe645ad AH |
123 | cmd.id = id; |
124 | init_completion(&cmd.complete); | |
125 | ||
126 | msm_dmov_enqueue_cmd(id, &cmd.dmov_cmd); | |
127 | wait_for_completion(&cmd.complete); | |
128 | ||
129 | if (cmd.result != 0x80000002) { | |
130 | PRINT_ERROR("dmov_exec_cmdptr(%d): ERROR, result: %x\n", id, cmd.result); | |
131 | PRINT_ERROR("dmov_exec_cmdptr(%d): flush: %x %x %x %x\n", | |
8a0f6f17 | 132 | id, cmd.err.flush[0], cmd.err.flush[1], cmd.err.flush[2], cmd.err.flush[3]); |
bfe645ad AH |
133 | return -EIO; |
134 | } | |
135 | PRINT_FLOW("dmov_exec_cmdptr(%d, %x) done\n", id, cmdptr); | |
136 | return 0; | |
137 | } | |
138 | ||
139 | ||
140 | static irqreturn_t msm_datamover_irq_handler(int irq, void *dev_id) | |
141 | { | |
142 | unsigned int int_status, mask, id; | |
143 | unsigned long irq_flags; | |
144 | unsigned int ch_status; | |
145 | unsigned int ch_result; | |
146 | struct msm_dmov_cmd *cmd; | |
147 | ||
148 | spin_lock_irqsave(&msm_dmov_lock, irq_flags); | |
149 | ||
150 | int_status = readl(DMOV_ISR); /* read and clear interrupt */ | |
151 | PRINT_FLOW("msm_datamover_irq_handler: DMOV_ISR %x\n", int_status); | |
152 | ||
153 | while (int_status) { | |
154 | mask = int_status & -int_status; | |
155 | id = fls(mask) - 1; | |
156 | PRINT_FLOW("msm_datamover_irq_handler %08x %08x id %d\n", int_status, mask, id); | |
157 | int_status &= ~mask; | |
158 | ch_status = readl(DMOV_STATUS(id)); | |
159 | if (!(ch_status & DMOV_STATUS_RSLT_VALID)) { | |
160 | PRINT_FLOW("msm_datamover_irq_handler id %d, result not valid %x\n", id, ch_status); | |
161 | continue; | |
162 | } | |
163 | do { | |
164 | ch_result = readl(DMOV_RSLT(id)); | |
165 | if (list_empty(&active_commands[id])) { | |
166 | PRINT_ERROR("msm_datamover_irq_handler id %d, got result " | |
167 | "with no active command, status %x, result %x\n", | |
168 | id, ch_status, ch_result); | |
169 | cmd = NULL; | |
170 | } else | |
171 | cmd = list_entry(active_commands[id].next, typeof(*cmd), list); | |
172 | PRINT_FLOW("msm_datamover_irq_handler id %d, status %x, result %x\n", id, ch_status, ch_result); | |
173 | if (ch_result & DMOV_RSLT_DONE) { | |
174 | PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", | |
175 | id, ch_status); | |
176 | PRINT_IO("msm_datamover_irq_handler id %d, got result " | |
177 | "for %p, result %x\n", id, cmd, ch_result); | |
178 | if (cmd) { | |
179 | list_del(&cmd->list); | |
9f68fcdb | 180 | dsb(); |
8a0f6f17 | 181 | cmd->complete_func(cmd, ch_result, NULL); |
bfe645ad AH |
182 | } |
183 | } | |
184 | if (ch_result & DMOV_RSLT_FLUSH) { | |
8a0f6f17 BS |
185 | struct msm_dmov_errdata errdata; |
186 | ||
187 | errdata.flush[0] = readl(DMOV_FLUSH0(id)); | |
188 | errdata.flush[1] = readl(DMOV_FLUSH1(id)); | |
189 | errdata.flush[2] = readl(DMOV_FLUSH2(id)); | |
190 | errdata.flush[3] = readl(DMOV_FLUSH3(id)); | |
191 | errdata.flush[4] = readl(DMOV_FLUSH4(id)); | |
192 | errdata.flush[5] = readl(DMOV_FLUSH5(id)); | |
bfe645ad | 193 | PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status); |
8a0f6f17 | 194 | PRINT_FLOW("msm_datamover_irq_handler id %d, flush, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]); |
bfe645ad AH |
195 | if (cmd) { |
196 | list_del(&cmd->list); | |
9f68fcdb | 197 | dsb(); |
8a0f6f17 | 198 | cmd->complete_func(cmd, ch_result, &errdata); |
bfe645ad AH |
199 | } |
200 | } | |
201 | if (ch_result & DMOV_RSLT_ERROR) { | |
8a0f6f17 BS |
202 | struct msm_dmov_errdata errdata; |
203 | ||
204 | errdata.flush[0] = readl(DMOV_FLUSH0(id)); | |
205 | errdata.flush[1] = readl(DMOV_FLUSH1(id)); | |
206 | errdata.flush[2] = readl(DMOV_FLUSH2(id)); | |
207 | errdata.flush[3] = readl(DMOV_FLUSH3(id)); | |
208 | errdata.flush[4] = readl(DMOV_FLUSH4(id)); | |
209 | errdata.flush[5] = readl(DMOV_FLUSH5(id)); | |
210 | ||
bfe645ad | 211 | PRINT_ERROR("msm_datamover_irq_handler id %d, status %x\n", id, ch_status); |
8a0f6f17 | 212 | PRINT_ERROR("msm_datamover_irq_handler id %d, error, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]); |
bfe645ad AH |
213 | if (cmd) { |
214 | list_del(&cmd->list); | |
9f68fcdb | 215 | dsb(); |
8a0f6f17 | 216 | cmd->complete_func(cmd, ch_result, &errdata); |
bfe645ad AH |
217 | } |
218 | /* this does not seem to work, once we get an error */ | |
219 | /* the datamover will no longer accept commands */ | |
220 | writel(0, DMOV_FLUSH0(id)); | |
221 | } | |
222 | ch_status = readl(DMOV_STATUS(id)); | |
223 | PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status); | |
224 | if ((ch_status & DMOV_STATUS_CMD_PTR_RDY) && !list_empty(&ready_commands[id])) { | |
225 | cmd = list_entry(ready_commands[id].next, typeof(*cmd), list); | |
226 | list_del(&cmd->list); | |
227 | list_add_tail(&cmd->list, &active_commands[id]); | |
5b00f40f SM |
228 | if (cmd->execute_func) |
229 | cmd->execute_func(cmd); | |
bfe645ad AH |
230 | PRINT_FLOW("msm_datamover_irq_handler id %d, start command\n", id); |
231 | writel(cmd->cmdptr, DMOV_CMD_PTR(id)); | |
232 | } | |
233 | } while (ch_status & DMOV_STATUS_RSLT_VALID); | |
8a0f6f17 BS |
234 | if (list_empty(&active_commands[id]) && list_empty(&ready_commands[id])) |
235 | channel_active &= ~(1U << id); | |
bfe645ad AH |
236 | PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status); |
237 | } | |
8a0f6f17 | 238 | |
c5541079 | 239 | if (!channel_active) { |
a6407dd7 | 240 | disable_irq_nosync(INT_ADM_AARM); |
c5541079 AH |
241 | clk_disable(msm_dmov_clk); |
242 | } | |
8a0f6f17 | 243 | |
bfe645ad AH |
244 | spin_unlock_irqrestore(&msm_dmov_lock, irq_flags); |
245 | return IRQ_HANDLED; | |
246 | } | |
247 | ||
248 | static int __init msm_init_datamover(void) | |
249 | { | |
250 | int i; | |
8a0f6f17 | 251 | int ret; |
c5541079 AH |
252 | struct clk *clk; |
253 | ||
bfe645ad AH |
254 | for (i = 0; i < MSM_DMOV_CHANNEL_COUNT; i++) { |
255 | INIT_LIST_HEAD(&ready_commands[i]); | |
256 | INIT_LIST_HEAD(&active_commands[i]); | |
257 | writel(DMOV_CONFIG_IRQ_EN | DMOV_CONFIG_FORCE_TOP_PTR_RSLT | DMOV_CONFIG_FORCE_FLUSH_RSLT, DMOV_CONFIG(i)); | |
258 | } | |
c5541079 AH |
259 | clk = clk_get(NULL, "adm_clk"); |
260 | if (IS_ERR(clk)) | |
261 | return PTR_ERR(clk); | |
262 | msm_dmov_clk = clk; | |
8a0f6f17 BS |
263 | ret = request_irq(INT_ADM_AARM, msm_datamover_irq_handler, 0, "msmdatamover", NULL); |
264 | if (ret) | |
265 | return ret; | |
266 | disable_irq(INT_ADM_AARM); | |
267 | return 0; | |
bfe645ad AH |
268 | } |
269 | ||
270 | arch_initcall(msm_init_datamover); | |
271 |