Merge branch 'for-linus' of git://git.monstr.eu/linux-2.6-microblaze
[sfrench/cifs-2.6.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                 if (cmd->execute_func)
73                         cmd->execute_func(cmd);
74                 PRINT_IO("msm_dmov_enqueue_cmd(%d), start command, status %x\n", id, status);
75                 list_add_tail(&cmd->list, &active_commands[id]);
76                 if (!channel_active)
77                         enable_irq(INT_ADM_AARM);
78                 channel_active |= 1U << id;
79                 writel(cmd->cmdptr, DMOV_CMD_PTR(id));
80         } else {
81                 if (!channel_active)
82                         clk_disable(msm_dmov_clk);
83                 if (list_empty(&active_commands[id]))
84                         PRINT_ERROR("msm_dmov_enqueue_cmd(%d), error datamover stalled, status %x\n", id, status);
85
86                 PRINT_IO("msm_dmov_enqueue_cmd(%d), enqueue command, status %x\n", id, status);
87                 list_add_tail(&cmd->list, &ready_commands[id]);
88         }
89         spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
90 }
91
92 struct msm_dmov_exec_cmdptr_cmd {
93         struct msm_dmov_cmd dmov_cmd;
94         struct completion complete;
95         unsigned id;
96         unsigned int result;
97         struct msm_dmov_errdata err;
98 };
99
100 static void
101 dmov_exec_cmdptr_complete_func(struct msm_dmov_cmd *_cmd,
102                                unsigned int result,
103                                struct msm_dmov_errdata *err)
104 {
105         struct msm_dmov_exec_cmdptr_cmd *cmd = container_of(_cmd, struct msm_dmov_exec_cmdptr_cmd, dmov_cmd);
106         cmd->result = result;
107         if (result != 0x80000002 && err)
108                 memcpy(&cmd->err, err, sizeof(struct msm_dmov_errdata));
109
110         complete(&cmd->complete);
111 }
112
113 int msm_dmov_exec_cmd(unsigned id, unsigned int cmdptr)
114 {
115         struct msm_dmov_exec_cmdptr_cmd cmd;
116
117         PRINT_FLOW("dmov_exec_cmdptr(%d, %x)\n", id, cmdptr);
118
119         cmd.dmov_cmd.cmdptr = cmdptr;
120         cmd.dmov_cmd.complete_func = dmov_exec_cmdptr_complete_func;
121         cmd.dmov_cmd.execute_func = NULL;
122         cmd.id = id;
123         init_completion(&cmd.complete);
124
125         msm_dmov_enqueue_cmd(id, &cmd.dmov_cmd);
126         wait_for_completion(&cmd.complete);
127
128         if (cmd.result != 0x80000002) {
129                 PRINT_ERROR("dmov_exec_cmdptr(%d): ERROR, result: %x\n", id, cmd.result);
130                 PRINT_ERROR("dmov_exec_cmdptr(%d):  flush: %x %x %x %x\n",
131                         id, cmd.err.flush[0], cmd.err.flush[1], cmd.err.flush[2], cmd.err.flush[3]);
132                 return -EIO;
133         }
134         PRINT_FLOW("dmov_exec_cmdptr(%d, %x) done\n", id, cmdptr);
135         return 0;
136 }
137
138
139 static irqreturn_t msm_datamover_irq_handler(int irq, void *dev_id)
140 {
141         unsigned int int_status, mask, id;
142         unsigned long irq_flags;
143         unsigned int ch_status;
144         unsigned int ch_result;
145         struct msm_dmov_cmd *cmd;
146
147         spin_lock_irqsave(&msm_dmov_lock, irq_flags);
148
149         int_status = readl(DMOV_ISR); /* read and clear interrupt */
150         PRINT_FLOW("msm_datamover_irq_handler: DMOV_ISR %x\n", int_status);
151
152         while (int_status) {
153                 mask = int_status & -int_status;
154                 id = fls(mask) - 1;
155                 PRINT_FLOW("msm_datamover_irq_handler %08x %08x id %d\n", int_status, mask, id);
156                 int_status &= ~mask;
157                 ch_status = readl(DMOV_STATUS(id));
158                 if (!(ch_status & DMOV_STATUS_RSLT_VALID)) {
159                         PRINT_FLOW("msm_datamover_irq_handler id %d, result not valid %x\n", id, ch_status);
160                         continue;
161                 }
162                 do {
163                         ch_result = readl(DMOV_RSLT(id));
164                         if (list_empty(&active_commands[id])) {
165                                 PRINT_ERROR("msm_datamover_irq_handler id %d, got result "
166                                         "with no active command, status %x, result %x\n",
167                                         id, ch_status, ch_result);
168                                 cmd = NULL;
169                         } else
170                                 cmd = list_entry(active_commands[id].next, typeof(*cmd), list);
171                         PRINT_FLOW("msm_datamover_irq_handler id %d, status %x, result %x\n", id, ch_status, ch_result);
172                         if (ch_result & DMOV_RSLT_DONE) {
173                                 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n",
174                                         id, ch_status);
175                                 PRINT_IO("msm_datamover_irq_handler id %d, got result "
176                                         "for %p, result %x\n", id, cmd, ch_result);
177                                 if (cmd) {
178                                         list_del(&cmd->list);
179                                         dsb();
180                                         cmd->complete_func(cmd, ch_result, NULL);
181                                 }
182                         }
183                         if (ch_result & DMOV_RSLT_FLUSH) {
184                                 struct msm_dmov_errdata errdata;
185
186                                 errdata.flush[0] = readl(DMOV_FLUSH0(id));
187                                 errdata.flush[1] = readl(DMOV_FLUSH1(id));
188                                 errdata.flush[2] = readl(DMOV_FLUSH2(id));
189                                 errdata.flush[3] = readl(DMOV_FLUSH3(id));
190                                 errdata.flush[4] = readl(DMOV_FLUSH4(id));
191                                 errdata.flush[5] = readl(DMOV_FLUSH5(id));
192                                 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
193                                 PRINT_FLOW("msm_datamover_irq_handler id %d, flush, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
194                                 if (cmd) {
195                                         list_del(&cmd->list);
196                                         dsb();
197                                         cmd->complete_func(cmd, ch_result, &errdata);
198                                 }
199                         }
200                         if (ch_result & DMOV_RSLT_ERROR) {
201                                 struct msm_dmov_errdata errdata;
202
203                                 errdata.flush[0] = readl(DMOV_FLUSH0(id));
204                                 errdata.flush[1] = readl(DMOV_FLUSH1(id));
205                                 errdata.flush[2] = readl(DMOV_FLUSH2(id));
206                                 errdata.flush[3] = readl(DMOV_FLUSH3(id));
207                                 errdata.flush[4] = readl(DMOV_FLUSH4(id));
208                                 errdata.flush[5] = readl(DMOV_FLUSH5(id));
209
210                                 PRINT_ERROR("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
211                                 PRINT_ERROR("msm_datamover_irq_handler id %d, error, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
212                                 if (cmd) {
213                                         list_del(&cmd->list);
214                                         dsb();
215                                         cmd->complete_func(cmd, ch_result, &errdata);
216                                 }
217                                 /* this does not seem to work, once we get an error */
218                                 /* the datamover will no longer accept commands */
219                                 writel(0, DMOV_FLUSH0(id));
220                         }
221                         ch_status = readl(DMOV_STATUS(id));
222                         PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
223                         if ((ch_status & DMOV_STATUS_CMD_PTR_RDY) && !list_empty(&ready_commands[id])) {
224                                 cmd = list_entry(ready_commands[id].next, typeof(*cmd), list);
225                                 list_del(&cmd->list);
226                                 list_add_tail(&cmd->list, &active_commands[id]);
227                                 if (cmd->execute_func)
228                                         cmd->execute_func(cmd);
229                                 PRINT_FLOW("msm_datamover_irq_handler id %d, start command\n", id);
230                                 writel(cmd->cmdptr, DMOV_CMD_PTR(id));
231                         }
232                 } while (ch_status & DMOV_STATUS_RSLT_VALID);
233                 if (list_empty(&active_commands[id]) && list_empty(&ready_commands[id]))
234                         channel_active &= ~(1U << id);
235                 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
236         }
237
238         if (!channel_active) {
239                 disable_irq_nosync(INT_ADM_AARM);
240                 clk_disable(msm_dmov_clk);
241         }
242
243         spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
244         return IRQ_HANDLED;
245 }
246
247 static int __init msm_init_datamover(void)
248 {
249         int i;
250         int ret;
251         struct clk *clk;
252
253         for (i = 0; i < MSM_DMOV_CHANNEL_COUNT; i++) {
254                 INIT_LIST_HEAD(&ready_commands[i]);
255                 INIT_LIST_HEAD(&active_commands[i]);
256                 writel(DMOV_CONFIG_IRQ_EN | DMOV_CONFIG_FORCE_TOP_PTR_RSLT | DMOV_CONFIG_FORCE_FLUSH_RSLT, DMOV_CONFIG(i));
257         }
258         clk = clk_get(NULL, "adm_clk");
259         if (IS_ERR(clk))
260                 return PTR_ERR(clk);
261         msm_dmov_clk = clk;
262         ret = request_irq(INT_ADM_AARM, msm_datamover_irq_handler, 0, "msmdatamover", NULL);
263         if (ret)
264                 return ret;
265         disable_irq(INT_ADM_AARM);
266         return 0;
267 }
268
269 arch_initcall(msm_init_datamover);
270