Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[pandora-kernel.git] / arch / arm / mach-msm / dma.c
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 <linux/clk.h>
17 #include <linux/err.h>
18 #include <linux/io.h>
19 #include <linux/interrupt.h>
20 #include <mach/dma.h>
21
22 #define MSM_DMOV_CHANNEL_COUNT 16
23
24 enum {
25         MSM_DMOV_PRINT_ERRORS = 1,
26         MSM_DMOV_PRINT_IO = 2,
27         MSM_DMOV_PRINT_FLOW = 4
28 };
29
30 static DEFINE_SPINLOCK(msm_dmov_lock);
31 static struct clk *msm_dmov_clk;
32 static unsigned int channel_active;
33 static struct list_head ready_commands[MSM_DMOV_CHANNEL_COUNT];
34 static struct list_head active_commands[MSM_DMOV_CHANNEL_COUNT];
35 unsigned int msm_dmov_print_mask = MSM_DMOV_PRINT_ERRORS;
36
37 #define MSM_DMOV_DPRINTF(mask, format, args...) \
38         do { \
39                 if ((mask) & msm_dmov_print_mask) \
40                         printk(KERN_ERR format, args); \
41         } while (0)
42 #define PRINT_ERROR(format, args...) \
43         MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_ERRORS, format, args);
44 #define PRINT_IO(format, args...) \
45         MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_IO, format, args);
46 #define PRINT_FLOW(format, args...) \
47         MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_FLOW, format, args);
48
49 void msm_dmov_stop_cmd(unsigned id, struct msm_dmov_cmd *cmd, int graceful)
50 {
51         writel((graceful << 31), DMOV_FLUSH0(id));
52 }
53
54 void msm_dmov_enqueue_cmd(unsigned id, struct msm_dmov_cmd *cmd)
55 {
56         unsigned long irq_flags;
57         unsigned int status;
58
59         spin_lock_irqsave(&msm_dmov_lock, irq_flags);
60         if (!channel_active)
61                 clk_enable(msm_dmov_clk);
62         dsb();
63         status = readl(DMOV_STATUS(id));
64         if (list_empty(&ready_commands[id]) &&
65                 (status & DMOV_STATUS_CMD_PTR_RDY)) {
66 #if 0
67                 if (list_empty(&active_commands[id])) {
68                         PRINT_FLOW("msm_dmov_enqueue_cmd(%d), enable interrupt\n", id);
69                         writel(DMOV_CONFIG_IRQ_EN, DMOV_CONFIG(id));
70                 }
71 #endif
72                 PRINT_IO("msm_dmov_enqueue_cmd(%d), start command, status %x\n", id, status);
73                 list_add_tail(&cmd->list, &active_commands[id]);
74                 if (!channel_active)
75                         enable_irq(INT_ADM_AARM);
76                 channel_active |= 1U << id;
77                 writel(cmd->cmdptr, DMOV_CMD_PTR(id));
78         } else {
79                 if (!channel_active)
80                         clk_disable(msm_dmov_clk);
81                 if (list_empty(&active_commands[id]))
82                         PRINT_ERROR("msm_dmov_enqueue_cmd(%d), error datamover stalled, status %x\n", id, status);
83
84                 PRINT_IO("msm_dmov_enqueue_cmd(%d), enqueue command, status %x\n", id, status);
85                 list_add_tail(&cmd->list, &ready_commands[id]);
86         }
87         spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
88 }
89
90 struct msm_dmov_exec_cmdptr_cmd {
91         struct msm_dmov_cmd dmov_cmd;
92         struct completion complete;
93         unsigned id;
94         unsigned int result;
95         struct msm_dmov_errdata err;
96 };
97
98 static void
99 dmov_exec_cmdptr_complete_func(struct msm_dmov_cmd *_cmd,
100                                unsigned int result,
101                                struct msm_dmov_errdata *err)
102 {
103         struct msm_dmov_exec_cmdptr_cmd *cmd = container_of(_cmd, struct msm_dmov_exec_cmdptr_cmd, dmov_cmd);
104         cmd->result = result;
105         if (result != 0x80000002 && err)
106                 memcpy(&cmd->err, err, sizeof(struct msm_dmov_errdata));
107
108         complete(&cmd->complete);
109 }
110
111 int msm_dmov_exec_cmd(unsigned id, unsigned int cmdptr)
112 {
113         struct msm_dmov_exec_cmdptr_cmd cmd;
114
115         PRINT_FLOW("dmov_exec_cmdptr(%d, %x)\n", id, cmdptr);
116
117         cmd.dmov_cmd.cmdptr = cmdptr;
118         cmd.dmov_cmd.complete_func = dmov_exec_cmdptr_complete_func;
119         cmd.id = id;
120         init_completion(&cmd.complete);
121
122         msm_dmov_enqueue_cmd(id, &cmd.dmov_cmd);
123         wait_for_completion(&cmd.complete);
124
125         if (cmd.result != 0x80000002) {
126                 PRINT_ERROR("dmov_exec_cmdptr(%d): ERROR, result: %x\n", id, cmd.result);
127                 PRINT_ERROR("dmov_exec_cmdptr(%d):  flush: %x %x %x %x\n",
128                         id, cmd.err.flush[0], cmd.err.flush[1], cmd.err.flush[2], cmd.err.flush[3]);
129                 return -EIO;
130         }
131         PRINT_FLOW("dmov_exec_cmdptr(%d, %x) done\n", id, cmdptr);
132         return 0;
133 }
134
135
136 static irqreturn_t msm_datamover_irq_handler(int irq, void *dev_id)
137 {
138         unsigned int int_status, mask, id;
139         unsigned long irq_flags;
140         unsigned int ch_status;
141         unsigned int ch_result;
142         struct msm_dmov_cmd *cmd;
143
144         spin_lock_irqsave(&msm_dmov_lock, irq_flags);
145
146         int_status = readl(DMOV_ISR); /* read and clear interrupt */
147         PRINT_FLOW("msm_datamover_irq_handler: DMOV_ISR %x\n", int_status);
148
149         while (int_status) {
150                 mask = int_status & -int_status;
151                 id = fls(mask) - 1;
152                 PRINT_FLOW("msm_datamover_irq_handler %08x %08x id %d\n", int_status, mask, id);
153                 int_status &= ~mask;
154                 ch_status = readl(DMOV_STATUS(id));
155                 if (!(ch_status & DMOV_STATUS_RSLT_VALID)) {
156                         PRINT_FLOW("msm_datamover_irq_handler id %d, result not valid %x\n", id, ch_status);
157                         continue;
158                 }
159                 do {
160                         ch_result = readl(DMOV_RSLT(id));
161                         if (list_empty(&active_commands[id])) {
162                                 PRINT_ERROR("msm_datamover_irq_handler id %d, got result "
163                                         "with no active command, status %x, result %x\n",
164                                         id, ch_status, ch_result);
165                                 cmd = NULL;
166                         } else
167                                 cmd = list_entry(active_commands[id].next, typeof(*cmd), list);
168                         PRINT_FLOW("msm_datamover_irq_handler id %d, status %x, result %x\n", id, ch_status, ch_result);
169                         if (ch_result & DMOV_RSLT_DONE) {
170                                 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n",
171                                         id, ch_status);
172                                 PRINT_IO("msm_datamover_irq_handler id %d, got result "
173                                         "for %p, result %x\n", id, cmd, ch_result);
174                                 if (cmd) {
175                                         list_del(&cmd->list);
176                                         dsb();
177                                         cmd->complete_func(cmd, ch_result, NULL);
178                                 }
179                         }
180                         if (ch_result & DMOV_RSLT_FLUSH) {
181                                 struct msm_dmov_errdata errdata;
182
183                                 errdata.flush[0] = readl(DMOV_FLUSH0(id));
184                                 errdata.flush[1] = readl(DMOV_FLUSH1(id));
185                                 errdata.flush[2] = readl(DMOV_FLUSH2(id));
186                                 errdata.flush[3] = readl(DMOV_FLUSH3(id));
187                                 errdata.flush[4] = readl(DMOV_FLUSH4(id));
188                                 errdata.flush[5] = readl(DMOV_FLUSH5(id));
189                                 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
190                                 PRINT_FLOW("msm_datamover_irq_handler id %d, flush, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
191                                 if (cmd) {
192                                         list_del(&cmd->list);
193                                         dsb();
194                                         cmd->complete_func(cmd, ch_result, &errdata);
195                                 }
196                         }
197                         if (ch_result & DMOV_RSLT_ERROR) {
198                                 struct msm_dmov_errdata errdata;
199
200                                 errdata.flush[0] = readl(DMOV_FLUSH0(id));
201                                 errdata.flush[1] = readl(DMOV_FLUSH1(id));
202                                 errdata.flush[2] = readl(DMOV_FLUSH2(id));
203                                 errdata.flush[3] = readl(DMOV_FLUSH3(id));
204                                 errdata.flush[4] = readl(DMOV_FLUSH4(id));
205                                 errdata.flush[5] = readl(DMOV_FLUSH5(id));
206
207                                 PRINT_ERROR("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
208                                 PRINT_ERROR("msm_datamover_irq_handler id %d, error, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
209                                 if (cmd) {
210                                         list_del(&cmd->list);
211                                         dsb();
212                                         cmd->complete_func(cmd, ch_result, &errdata);
213                                 }
214                                 /* this does not seem to work, once we get an error */
215                                 /* the datamover will no longer accept commands */
216                                 writel(0, DMOV_FLUSH0(id));
217                         }
218                         ch_status = readl(DMOV_STATUS(id));
219                         PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
220                         if ((ch_status & DMOV_STATUS_CMD_PTR_RDY) && !list_empty(&ready_commands[id])) {
221                                 cmd = list_entry(ready_commands[id].next, typeof(*cmd), list);
222                                 list_del(&cmd->list);
223                                 list_add_tail(&cmd->list, &active_commands[id]);
224                                 PRINT_FLOW("msm_datamover_irq_handler id %d, start command\n", id);
225                                 writel(cmd->cmdptr, DMOV_CMD_PTR(id));
226                         }
227                 } while (ch_status & DMOV_STATUS_RSLT_VALID);
228                 if (list_empty(&active_commands[id]) && list_empty(&ready_commands[id]))
229                         channel_active &= ~(1U << id);
230                 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
231         }
232
233         if (!channel_active) {
234                 disable_irq_nosync(INT_ADM_AARM);
235                 clk_disable(msm_dmov_clk);
236         }
237
238         spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
239         return IRQ_HANDLED;
240 }
241
242 static int __init msm_init_datamover(void)
243 {
244         int i;
245         int ret;
246         struct clk *clk;
247
248         for (i = 0; i < MSM_DMOV_CHANNEL_COUNT; i++) {
249                 INIT_LIST_HEAD(&ready_commands[i]);
250                 INIT_LIST_HEAD(&active_commands[i]);
251                 writel(DMOV_CONFIG_IRQ_EN | DMOV_CONFIG_FORCE_TOP_PTR_RSLT | DMOV_CONFIG_FORCE_FLUSH_RSLT, DMOV_CONFIG(i));
252         }
253         clk = clk_get(NULL, "adm_clk");
254         if (IS_ERR(clk))
255                 return PTR_ERR(clk);
256         msm_dmov_clk = clk;
257         ret = request_irq(INT_ADM_AARM, msm_datamover_irq_handler, 0, "msmdatamover", NULL);
258         if (ret)
259                 return ret;
260         disable_irq(INT_ADM_AARM);
261         return 0;
262 }
263
264 arch_initcall(msm_init_datamover);
265