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Arve Hjønnevågbfe645a2007-11-26 04:12:29 -08001/* 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
Russell Kingfced80c2008-09-06 12:10:45 +010016#include <linux/io.h>
Arve Hjønnevågbfe645a2007-11-26 04:12:29 -080017#include <linux/interrupt.h>
Russell Kinga09e64f2008-08-05 16:14:15 +010018#include <mach/dma.h>
Arve Hjønnevågbfe645a2007-11-26 04:12:29 -080019
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);
Brian Swetland8a0f6f12008-09-10 14:58:25 -070029static unsigned int channel_active;
Arve Hjønnevågbfe645a2007-11-26 04:12:29 -080030static 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
Brian Swetland8a0f6f12008-09-10 14:58:25 -070046void msm_dmov_stop_cmd(unsigned id, struct msm_dmov_cmd *cmd, int graceful)
47{
48 writel((graceful << 31), DMOV_FLUSH0(id));
49}
50
Arve Hjønnevågbfe645a2007-11-26 04:12:29 -080051void 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]);
Brian Swetland8a0f6f12008-09-10 14:58:25 -070068 if (!channel_active)
69 enable_irq(INT_ADM_AARM);
70 channel_active |= 1U << id;
Arve Hjønnevågbfe645a2007-11-26 04:12:29 -080071 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
82struct msm_dmov_exec_cmdptr_cmd {
83 struct msm_dmov_cmd dmov_cmd;
84 struct completion complete;
85 unsigned id;
86 unsigned int result;
Brian Swetland8a0f6f12008-09-10 14:58:25 -070087 struct msm_dmov_errdata err;
Arve Hjønnevågbfe645a2007-11-26 04:12:29 -080088};
89
Brian Swetland8a0f6f12008-09-10 14:58:25 -070090static void
91dmov_exec_cmdptr_complete_func(struct msm_dmov_cmd *_cmd,
92 unsigned int result,
93 struct msm_dmov_errdata *err)
Arve Hjønnevågbfe645a2007-11-26 04:12:29 -080094{
95 struct msm_dmov_exec_cmdptr_cmd *cmd = container_of(_cmd, struct msm_dmov_exec_cmdptr_cmd, dmov_cmd);
96 cmd->result = result;
Brian Swetland8a0f6f12008-09-10 14:58:25 -070097 if (result != 0x80000002 && err)
98 memcpy(&cmd->err, err, sizeof(struct msm_dmov_errdata));
99
Arve Hjønnevågbfe645a2007-11-26 04:12:29 -0800100 complete(&cmd->complete);
101}
102
103int 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",
Brian Swetland8a0f6f12008-09-10 14:58:25 -0700120 id, cmd.err.flush[0], cmd.err.flush[1], cmd.err.flush[2], cmd.err.flush[3]);
Arve Hjønnevågbfe645a2007-11-26 04:12:29 -0800121 return -EIO;
122 }
123 PRINT_FLOW("dmov_exec_cmdptr(%d, %x) done\n", id, cmdptr);
124 return 0;
125}
126
127
128static 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);
Brian Swetland8a0f6f12008-09-10 14:58:25 -0700168 cmd->complete_func(cmd, ch_result, NULL);
Arve Hjønnevågbfe645a2007-11-26 04:12:29 -0800169 }
170 }
171 if (ch_result & DMOV_RSLT_FLUSH) {
Brian Swetland8a0f6f12008-09-10 14:58:25 -0700172 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));
Arve Hjønnevågbfe645a2007-11-26 04:12:29 -0800180 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
Brian Swetland8a0f6f12008-09-10 14:58:25 -0700181 PRINT_FLOW("msm_datamover_irq_handler id %d, flush, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
Arve Hjønnevågbfe645a2007-11-26 04:12:29 -0800182 if (cmd) {
183 list_del(&cmd->list);
Brian Swetland8a0f6f12008-09-10 14:58:25 -0700184 cmd->complete_func(cmd, ch_result, &errdata);
Arve Hjønnevågbfe645a2007-11-26 04:12:29 -0800185 }
186 }
187 if (ch_result & DMOV_RSLT_ERROR) {
Brian Swetland8a0f6f12008-09-10 14:58:25 -0700188 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
Arve Hjønnevågbfe645a2007-11-26 04:12:29 -0800197 PRINT_ERROR("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
Brian Swetland8a0f6f12008-09-10 14:58:25 -0700198 PRINT_ERROR("msm_datamover_irq_handler id %d, error, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
Arve Hjønnevågbfe645a2007-11-26 04:12:29 -0800199 if (cmd) {
200 list_del(&cmd->list);
Brian Swetland8a0f6f12008-09-10 14:58:25 -0700201 cmd->complete_func(cmd, ch_result, &errdata);
Arve Hjønnevågbfe645a2007-11-26 04:12:29 -0800202 }
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);
Brian Swetland8a0f6f12008-09-10 14:58:25 -0700217 if (list_empty(&active_commands[id]) && list_empty(&ready_commands[id]))
218 channel_active &= ~(1U << id);
Arve Hjønnevågbfe645a2007-11-26 04:12:29 -0800219 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
220 }
Brian Swetland8a0f6f12008-09-10 14:58:25 -0700221
222 if (!channel_active)
223 disable_irq(INT_ADM_AARM);
224
Arve Hjønnevågbfe645a2007-11-26 04:12:29 -0800225 spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
226 return IRQ_HANDLED;
227}
228
229static int __init msm_init_datamover(void)
230{
231 int i;
Brian Swetland8a0f6f12008-09-10 14:58:25 -0700232 int ret;
Arve Hjønnevågbfe645a2007-11-26 04:12:29 -0800233 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 }
Brian Swetland8a0f6f12008-09-10 14:58:25 -0700238 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;
Arve Hjønnevågbfe645a2007-11-26 04:12:29 -0800243}
244
245arch_initcall(msm_init_datamover);
246