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-rw-r--r--arch/arm/mach-msm/dma.c214
1 files changed, 214 insertions, 0 deletions
diff --git a/arch/arm/mach-msm/dma.c b/arch/arm/mach-msm/dma.c
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index 000000000000..8b0f339b3274
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+++ b/arch/arm/mach-msm/dma.c
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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
16#include <asm/io.h>
17#include <linux/interrupt.h>
18#include <asm/arch/dma.h>
19
20#define MSM_DMOV_CHANNEL_COUNT 16
21
22enum {
23 MSM_DMOV_PRINT_ERRORS = 1,
24 MSM_DMOV_PRINT_IO = 2,
25 MSM_DMOV_PRINT_FLOW = 4
26};
27
28static DEFINE_SPINLOCK(msm_dmov_lock);
29static struct msm_dmov_cmd active_command;
30static struct list_head ready_commands[MSM_DMOV_CHANNEL_COUNT];
31static struct list_head active_commands[MSM_DMOV_CHANNEL_COUNT];
32unsigned 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
46void msm_dmov_enqueue_cmd(unsigned id, struct msm_dmov_cmd *cmd)
47{
48 unsigned long irq_flags;
49 unsigned int status;
50
51 spin_lock_irqsave(&msm_dmov_lock, irq_flags);
52 status = readl(DMOV_STATUS(id));
53 if (list_empty(&ready_commands[id]) &&
54 (status & DMOV_STATUS_CMD_PTR_RDY)) {
55#if 0
56 if (list_empty(&active_commands[id])) {
57 PRINT_FLOW("msm_dmov_enqueue_cmd(%d), enable interrupt\n", id);
58 writel(DMOV_CONFIG_IRQ_EN, DMOV_CONFIG(id));
59 }
60#endif
61 PRINT_IO("msm_dmov_enqueue_cmd(%d), start command, status %x\n", id, status);
62 list_add_tail(&cmd->list, &active_commands[id]);
63 writel(cmd->cmdptr, DMOV_CMD_PTR(id));
64 } else {
65 if (list_empty(&active_commands[id]))
66 PRINT_ERROR("msm_dmov_enqueue_cmd(%d), error datamover stalled, status %x\n", id, status);
67
68 PRINT_IO("msm_dmov_enqueue_cmd(%d), enqueue command, status %x\n", id, status);
69 list_add_tail(&cmd->list, &ready_commands[id]);
70 }
71 spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
72}
73
74struct msm_dmov_exec_cmdptr_cmd {
75 struct msm_dmov_cmd dmov_cmd;
76 struct completion complete;
77 unsigned id;
78 unsigned int result;
79 unsigned int flush[6];
80};
81
82static void dmov_exec_cmdptr_complete_func(struct msm_dmov_cmd *_cmd, unsigned int result)
83{
84 struct msm_dmov_exec_cmdptr_cmd *cmd = container_of(_cmd, struct msm_dmov_exec_cmdptr_cmd, dmov_cmd);
85 cmd->result = result;
86 if (result != 0x80000002) {
87 cmd->flush[0] = readl(DMOV_FLUSH0(cmd->id));
88 cmd->flush[1] = readl(DMOV_FLUSH1(cmd->id));
89 cmd->flush[2] = readl(DMOV_FLUSH2(cmd->id));
90 cmd->flush[3] = readl(DMOV_FLUSH3(cmd->id));
91 cmd->flush[4] = readl(DMOV_FLUSH4(cmd->id));
92 cmd->flush[5] = readl(DMOV_FLUSH5(cmd->id));
93 }
94 complete(&cmd->complete);
95}
96
97int msm_dmov_exec_cmd(unsigned id, unsigned int cmdptr)
98{
99 struct msm_dmov_exec_cmdptr_cmd cmd;
100
101 PRINT_FLOW("dmov_exec_cmdptr(%d, %x)\n", id, cmdptr);
102
103 cmd.dmov_cmd.cmdptr = cmdptr;
104 cmd.dmov_cmd.complete_func = dmov_exec_cmdptr_complete_func;
105 cmd.id = id;
106 init_completion(&cmd.complete);
107
108 msm_dmov_enqueue_cmd(id, &cmd.dmov_cmd);
109 wait_for_completion(&cmd.complete);
110
111 if (cmd.result != 0x80000002) {
112 PRINT_ERROR("dmov_exec_cmdptr(%d): ERROR, result: %x\n", id, cmd.result);
113 PRINT_ERROR("dmov_exec_cmdptr(%d): flush: %x %x %x %x\n",
114 id, cmd.flush[0], cmd.flush[1], cmd.flush[2], cmd.flush[3]);
115 return -EIO;
116 }
117 PRINT_FLOW("dmov_exec_cmdptr(%d, %x) done\n", id, cmdptr);
118 return 0;
119}
120
121
122static irqreturn_t msm_datamover_irq_handler(int irq, void *dev_id)
123{
124 unsigned int int_status, mask, id;
125 unsigned long irq_flags;
126 unsigned int ch_status;
127 unsigned int ch_result;
128 struct msm_dmov_cmd *cmd;
129
130 spin_lock_irqsave(&msm_dmov_lock, irq_flags);
131
132 int_status = readl(DMOV_ISR); /* read and clear interrupt */
133 PRINT_FLOW("msm_datamover_irq_handler: DMOV_ISR %x\n", int_status);
134
135 while (int_status) {
136 mask = int_status & -int_status;
137 id = fls(mask) - 1;
138 PRINT_FLOW("msm_datamover_irq_handler %08x %08x id %d\n", int_status, mask, id);
139 int_status &= ~mask;
140 ch_status = readl(DMOV_STATUS(id));
141 if (!(ch_status & DMOV_STATUS_RSLT_VALID)) {
142 PRINT_FLOW("msm_datamover_irq_handler id %d, result not valid %x\n", id, ch_status);
143 continue;
144 }
145 do {
146 ch_result = readl(DMOV_RSLT(id));
147 if (list_empty(&active_commands[id])) {
148 PRINT_ERROR("msm_datamover_irq_handler id %d, got result "
149 "with no active command, status %x, result %x\n",
150 id, ch_status, ch_result);
151 cmd = NULL;
152 } else
153 cmd = list_entry(active_commands[id].next, typeof(*cmd), list);
154 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x, result %x\n", id, ch_status, ch_result);
155 if (ch_result & DMOV_RSLT_DONE) {
156 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n",
157 id, ch_status);
158 PRINT_IO("msm_datamover_irq_handler id %d, got result "
159 "for %p, result %x\n", id, cmd, ch_result);
160 if (cmd) {
161 list_del(&cmd->list);
162 cmd->complete_func(cmd, ch_result);
163 }
164 }
165 if (ch_result & DMOV_RSLT_FLUSH) {
166 unsigned int flush0 = readl(DMOV_FLUSH0(id));
167 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
168 PRINT_FLOW("msm_datamover_irq_handler id %d, flush, result %x, flush0 %x\n", id, ch_result, flush0);
169 if (cmd) {
170 list_del(&cmd->list);
171 cmd->complete_func(cmd, ch_result);
172 }
173 }
174 if (ch_result & DMOV_RSLT_ERROR) {
175 unsigned int flush0 = readl(DMOV_FLUSH0(id));
176 PRINT_ERROR("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
177 PRINT_ERROR("msm_datamover_irq_handler id %d, error, result %x, flush0 %x\n", id, ch_result, flush0);
178 if (cmd) {
179 list_del(&cmd->list);
180 cmd->complete_func(cmd, ch_result);
181 }
182 /* this does not seem to work, once we get an error */
183 /* the datamover will no longer accept commands */
184 writel(0, DMOV_FLUSH0(id));
185 }
186 ch_status = readl(DMOV_STATUS(id));
187 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
188 if ((ch_status & DMOV_STATUS_CMD_PTR_RDY) && !list_empty(&ready_commands[id])) {
189 cmd = list_entry(ready_commands[id].next, typeof(*cmd), list);
190 list_del(&cmd->list);
191 list_add_tail(&cmd->list, &active_commands[id]);
192 PRINT_FLOW("msm_datamover_irq_handler id %d, start command\n", id);
193 writel(cmd->cmdptr, DMOV_CMD_PTR(id));
194 }
195 } while (ch_status & DMOV_STATUS_RSLT_VALID);
196 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
197 }
198 spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
199 return IRQ_HANDLED;
200}
201
202static int __init msm_init_datamover(void)
203{
204 int i;
205 for (i = 0; i < MSM_DMOV_CHANNEL_COUNT; i++) {
206 INIT_LIST_HEAD(&ready_commands[i]);
207 INIT_LIST_HEAD(&active_commands[i]);
208 writel(DMOV_CONFIG_IRQ_EN | DMOV_CONFIG_FORCE_TOP_PTR_RSLT | DMOV_CONFIG_FORCE_FLUSH_RSLT, DMOV_CONFIG(i));
209 }
210 return request_irq(INT_ADM_AARM, msm_datamover_irq_handler, 0, "msmdatamover", NULL);
211}
212
213arch_initcall(msm_init_datamover);
214
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