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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 | ||
fced80c7 | 16 | #include <linux/io.h> |
bfe645ad | 17 | #include <linux/interrupt.h> |
a09e64fb | 18 | #include <mach/dma.h> |
bfe645ad AH |
19 | |
20 | #define MSM_DMOV_CHANNEL_COUNT 16 | |
21 | ||
22 | enum { | |
23 | MSM_DMOV_PRINT_ERRORS = 1, | |
24 | MSM_DMOV_PRINT_IO = 2, | |
25 | MSM_DMOV_PRINT_FLOW = 4 | |
26 | }; | |
27 | ||
28 | static DEFINE_SPINLOCK(msm_dmov_lock); | |
8a0f6f17 | 29 | static unsigned int channel_active; |
bfe645ad AH |
30 | static struct list_head ready_commands[MSM_DMOV_CHANNEL_COUNT]; |
31 | static struct list_head active_commands[MSM_DMOV_CHANNEL_COUNT]; | |
32 | unsigned int msm_dmov_print_mask = MSM_DMOV_PRINT_ERRORS; | |
33 | ||
34 | #define MSM_DMOV_DPRINTF(mask, format, args...) \ | |
35 | do { \ | |
36 | if ((mask) & msm_dmov_print_mask) \ | |
37 | printk(KERN_ERR format, args); \ | |
38 | } while (0) | |
39 | #define PRINT_ERROR(format, args...) \ | |
40 | MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_ERRORS, format, args); | |
41 | #define PRINT_IO(format, args...) \ | |
42 | MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_IO, format, args); | |
43 | #define PRINT_FLOW(format, args...) \ | |
44 | MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_FLOW, format, args); | |
45 | ||
8a0f6f17 BS |
46 | void msm_dmov_stop_cmd(unsigned id, struct msm_dmov_cmd *cmd, int graceful) |
47 | { | |
48 | writel((graceful << 31), DMOV_FLUSH0(id)); | |
49 | } | |
50 | ||
bfe645ad AH |
51 | void msm_dmov_enqueue_cmd(unsigned id, struct msm_dmov_cmd *cmd) |
52 | { | |
53 | unsigned long irq_flags; | |
54 | unsigned int status; | |
55 | ||
56 | spin_lock_irqsave(&msm_dmov_lock, irq_flags); | |
57 | status = readl(DMOV_STATUS(id)); | |
58 | if (list_empty(&ready_commands[id]) && | |
59 | (status & DMOV_STATUS_CMD_PTR_RDY)) { | |
60 | #if 0 | |
61 | if (list_empty(&active_commands[id])) { | |
62 | PRINT_FLOW("msm_dmov_enqueue_cmd(%d), enable interrupt\n", id); | |
63 | writel(DMOV_CONFIG_IRQ_EN, DMOV_CONFIG(id)); | |
64 | } | |
65 | #endif | |
66 | PRINT_IO("msm_dmov_enqueue_cmd(%d), start command, status %x\n", id, status); | |
67 | list_add_tail(&cmd->list, &active_commands[id]); | |
8a0f6f17 BS |
68 | if (!channel_active) |
69 | enable_irq(INT_ADM_AARM); | |
70 | channel_active |= 1U << id; | |
bfe645ad AH |
71 | writel(cmd->cmdptr, DMOV_CMD_PTR(id)); |
72 | } else { | |
73 | if (list_empty(&active_commands[id])) | |
74 | PRINT_ERROR("msm_dmov_enqueue_cmd(%d), error datamover stalled, status %x\n", id, status); | |
75 | ||
76 | PRINT_IO("msm_dmov_enqueue_cmd(%d), enqueue command, status %x\n", id, status); | |
77 | list_add_tail(&cmd->list, &ready_commands[id]); | |
78 | } | |
79 | spin_unlock_irqrestore(&msm_dmov_lock, irq_flags); | |
80 | } | |
81 | ||
82 | struct msm_dmov_exec_cmdptr_cmd { | |
83 | struct msm_dmov_cmd dmov_cmd; | |
84 | struct completion complete; | |
85 | unsigned id; | |
86 | unsigned int result; | |
8a0f6f17 | 87 | struct msm_dmov_errdata err; |
bfe645ad AH |
88 | }; |
89 | ||
8a0f6f17 BS |
90 | static void |
91 | dmov_exec_cmdptr_complete_func(struct msm_dmov_cmd *_cmd, | |
92 | unsigned int result, | |
93 | struct msm_dmov_errdata *err) | |
bfe645ad AH |
94 | { |
95 | struct msm_dmov_exec_cmdptr_cmd *cmd = container_of(_cmd, struct msm_dmov_exec_cmdptr_cmd, dmov_cmd); | |
96 | cmd->result = result; | |
8a0f6f17 BS |
97 | if (result != 0x80000002 && err) |
98 | memcpy(&cmd->err, err, sizeof(struct msm_dmov_errdata)); | |
99 | ||
bfe645ad AH |
100 | complete(&cmd->complete); |
101 | } | |
102 | ||
103 | int msm_dmov_exec_cmd(unsigned id, unsigned int cmdptr) | |
104 | { | |
105 | struct msm_dmov_exec_cmdptr_cmd cmd; | |
106 | ||
107 | PRINT_FLOW("dmov_exec_cmdptr(%d, %x)\n", id, cmdptr); | |
108 | ||
109 | cmd.dmov_cmd.cmdptr = cmdptr; | |
110 | cmd.dmov_cmd.complete_func = dmov_exec_cmdptr_complete_func; | |
111 | cmd.id = id; | |
112 | init_completion(&cmd.complete); | |
113 | ||
114 | msm_dmov_enqueue_cmd(id, &cmd.dmov_cmd); | |
115 | wait_for_completion(&cmd.complete); | |
116 | ||
117 | if (cmd.result != 0x80000002) { | |
118 | PRINT_ERROR("dmov_exec_cmdptr(%d): ERROR, result: %x\n", id, cmd.result); | |
119 | PRINT_ERROR("dmov_exec_cmdptr(%d): flush: %x %x %x %x\n", | |
8a0f6f17 | 120 | id, cmd.err.flush[0], cmd.err.flush[1], cmd.err.flush[2], cmd.err.flush[3]); |
bfe645ad AH |
121 | return -EIO; |
122 | } | |
123 | PRINT_FLOW("dmov_exec_cmdptr(%d, %x) done\n", id, cmdptr); | |
124 | return 0; | |
125 | } | |
126 | ||
127 | ||
128 | static irqreturn_t msm_datamover_irq_handler(int irq, void *dev_id) | |
129 | { | |
130 | unsigned int int_status, mask, id; | |
131 | unsigned long irq_flags; | |
132 | unsigned int ch_status; | |
133 | unsigned int ch_result; | |
134 | struct msm_dmov_cmd *cmd; | |
135 | ||
136 | spin_lock_irqsave(&msm_dmov_lock, irq_flags); | |
137 | ||
138 | int_status = readl(DMOV_ISR); /* read and clear interrupt */ | |
139 | PRINT_FLOW("msm_datamover_irq_handler: DMOV_ISR %x\n", int_status); | |
140 | ||
141 | while (int_status) { | |
142 | mask = int_status & -int_status; | |
143 | id = fls(mask) - 1; | |
144 | PRINT_FLOW("msm_datamover_irq_handler %08x %08x id %d\n", int_status, mask, id); | |
145 | int_status &= ~mask; | |
146 | ch_status = readl(DMOV_STATUS(id)); | |
147 | if (!(ch_status & DMOV_STATUS_RSLT_VALID)) { | |
148 | PRINT_FLOW("msm_datamover_irq_handler id %d, result not valid %x\n", id, ch_status); | |
149 | continue; | |
150 | } | |
151 | do { | |
152 | ch_result = readl(DMOV_RSLT(id)); | |
153 | if (list_empty(&active_commands[id])) { | |
154 | PRINT_ERROR("msm_datamover_irq_handler id %d, got result " | |
155 | "with no active command, status %x, result %x\n", | |
156 | id, ch_status, ch_result); | |
157 | cmd = NULL; | |
158 | } else | |
159 | cmd = list_entry(active_commands[id].next, typeof(*cmd), list); | |
160 | PRINT_FLOW("msm_datamover_irq_handler id %d, status %x, result %x\n", id, ch_status, ch_result); | |
161 | if (ch_result & DMOV_RSLT_DONE) { | |
162 | PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", | |
163 | id, ch_status); | |
164 | PRINT_IO("msm_datamover_irq_handler id %d, got result " | |
165 | "for %p, result %x\n", id, cmd, ch_result); | |
166 | if (cmd) { | |
167 | list_del(&cmd->list); | |
8a0f6f17 | 168 | cmd->complete_func(cmd, ch_result, NULL); |
bfe645ad AH |
169 | } |
170 | } | |
171 | if (ch_result & DMOV_RSLT_FLUSH) { | |
8a0f6f17 BS |
172 | struct msm_dmov_errdata errdata; |
173 | ||
174 | errdata.flush[0] = readl(DMOV_FLUSH0(id)); | |
175 | errdata.flush[1] = readl(DMOV_FLUSH1(id)); | |
176 | errdata.flush[2] = readl(DMOV_FLUSH2(id)); | |
177 | errdata.flush[3] = readl(DMOV_FLUSH3(id)); | |
178 | errdata.flush[4] = readl(DMOV_FLUSH4(id)); | |
179 | errdata.flush[5] = readl(DMOV_FLUSH5(id)); | |
bfe645ad | 180 | PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status); |
8a0f6f17 | 181 | PRINT_FLOW("msm_datamover_irq_handler id %d, flush, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]); |
bfe645ad AH |
182 | if (cmd) { |
183 | list_del(&cmd->list); | |
8a0f6f17 | 184 | cmd->complete_func(cmd, ch_result, &errdata); |
bfe645ad AH |
185 | } |
186 | } | |
187 | if (ch_result & DMOV_RSLT_ERROR) { | |
8a0f6f17 BS |
188 | struct msm_dmov_errdata errdata; |
189 | ||
190 | errdata.flush[0] = readl(DMOV_FLUSH0(id)); | |
191 | errdata.flush[1] = readl(DMOV_FLUSH1(id)); | |
192 | errdata.flush[2] = readl(DMOV_FLUSH2(id)); | |
193 | errdata.flush[3] = readl(DMOV_FLUSH3(id)); | |
194 | errdata.flush[4] = readl(DMOV_FLUSH4(id)); | |
195 | errdata.flush[5] = readl(DMOV_FLUSH5(id)); | |
196 | ||
bfe645ad | 197 | PRINT_ERROR("msm_datamover_irq_handler id %d, status %x\n", id, ch_status); |
8a0f6f17 | 198 | PRINT_ERROR("msm_datamover_irq_handler id %d, error, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]); |
bfe645ad AH |
199 | if (cmd) { |
200 | list_del(&cmd->list); | |
8a0f6f17 | 201 | cmd->complete_func(cmd, ch_result, &errdata); |
bfe645ad AH |
202 | } |
203 | /* this does not seem to work, once we get an error */ | |
204 | /* the datamover will no longer accept commands */ | |
205 | writel(0, DMOV_FLUSH0(id)); | |
206 | } | |
207 | ch_status = readl(DMOV_STATUS(id)); | |
208 | PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status); | |
209 | if ((ch_status & DMOV_STATUS_CMD_PTR_RDY) && !list_empty(&ready_commands[id])) { | |
210 | cmd = list_entry(ready_commands[id].next, typeof(*cmd), list); | |
211 | list_del(&cmd->list); | |
212 | list_add_tail(&cmd->list, &active_commands[id]); | |
213 | PRINT_FLOW("msm_datamover_irq_handler id %d, start command\n", id); | |
214 | writel(cmd->cmdptr, DMOV_CMD_PTR(id)); | |
215 | } | |
216 | } while (ch_status & DMOV_STATUS_RSLT_VALID); | |
8a0f6f17 BS |
217 | if (list_empty(&active_commands[id]) && list_empty(&ready_commands[id])) |
218 | channel_active &= ~(1U << id); | |
bfe645ad AH |
219 | PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status); |
220 | } | |
8a0f6f17 BS |
221 | |
222 | if (!channel_active) | |
223 | disable_irq(INT_ADM_AARM); | |
224 | ||
bfe645ad AH |
225 | spin_unlock_irqrestore(&msm_dmov_lock, irq_flags); |
226 | return IRQ_HANDLED; | |
227 | } | |
228 | ||
229 | static int __init msm_init_datamover(void) | |
230 | { | |
231 | int i; | |
8a0f6f17 | 232 | int ret; |
bfe645ad AH |
233 | for (i = 0; i < MSM_DMOV_CHANNEL_COUNT; i++) { |
234 | INIT_LIST_HEAD(&ready_commands[i]); | |
235 | INIT_LIST_HEAD(&active_commands[i]); | |
236 | writel(DMOV_CONFIG_IRQ_EN | DMOV_CONFIG_FORCE_TOP_PTR_RSLT | DMOV_CONFIG_FORCE_FLUSH_RSLT, DMOV_CONFIG(i)); | |
237 | } | |
8a0f6f17 BS |
238 | ret = request_irq(INT_ADM_AARM, msm_datamover_irq_handler, 0, "msmdatamover", NULL); |
239 | if (ret) | |
240 | return ret; | |
241 | disable_irq(INT_ADM_AARM); | |
242 | return 0; | |
bfe645ad AH |
243 | } |
244 | ||
245 | arch_initcall(msm_init_datamover); | |
246 |