Merge branch 'msm-urgent' of git://codeaurora.org/quic/kernel/dwalker/linux-msm
[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 <linux/completion.h>
21 #include <mach/dma.h>
22
23 #define MSM_DMOV_CHANNEL_COUNT 16
24
25 enum {
26         MSM_DMOV_PRINT_ERRORS = 1,
27         MSM_DMOV_PRINT_IO = 2,
28         MSM_DMOV_PRINT_FLOW = 4
29 };
30
31 static DEFINE_SPINLOCK(msm_dmov_lock);
32 static struct clk *msm_dmov_clk;
33 static unsigned int channel_active;
34 static struct list_head ready_commands[MSM_DMOV_CHANNEL_COUNT];
35 static struct list_head active_commands[MSM_DMOV_CHANNEL_COUNT];
36 unsigned int msm_dmov_print_mask = MSM_DMOV_PRINT_ERRORS;
37
38 #define MSM_DMOV_DPRINTF(mask, format, args...) \
39         do { \
40                 if ((mask) & msm_dmov_print_mask) \
41                         printk(KERN_ERR format, args); \
42         } while (0)
43 #define PRINT_ERROR(format, args...) \
44         MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_ERRORS, format, args);
45 #define PRINT_IO(format, args...) \
46         MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_IO, format, args);
47 #define PRINT_FLOW(format, args...) \
48         MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_FLOW, format, args);
49
50 void msm_dmov_stop_cmd(unsigned id, struct msm_dmov_cmd *cmd, int graceful)
51 {
52         writel((graceful << 31), DMOV_FLUSH0(id));
53 }
54
55 void msm_dmov_enqueue_cmd(unsigned id, struct msm_dmov_cmd *cmd)
56 {
57         unsigned long irq_flags;
58         unsigned int status;
59
60         spin_lock_irqsave(&msm_dmov_lock, irq_flags);
61         if (!channel_active)
62                 clk_enable(msm_dmov_clk);
63         dsb();
64         status = readl(DMOV_STATUS(id));
65         if (list_empty(&ready_commands[id]) &&
66                 (status & DMOV_STATUS_CMD_PTR_RDY)) {
67 #if 0
68                 if (list_empty(&active_commands[id])) {
69                         PRINT_FLOW("msm_dmov_enqueue_cmd(%d), enable interrupt\n", id);
70                         writel(DMOV_CONFIG_IRQ_EN, DMOV_CONFIG(id));
71                 }
72 #endif
73                 if (cmd->execute_func)
74                         cmd->execute_func(cmd);
75                 PRINT_IO("msm_dmov_enqueue_cmd(%d), start command, status %x\n", id, status);
76                 list_add_tail(&cmd->list, &active_commands[id]);
77                 if (!channel_active)
78                         enable_irq(INT_ADM_AARM);
79                 channel_active |= 1U << id;
80                 writel(cmd->cmdptr, DMOV_CMD_PTR(id));
81         } else {
82                 if (!channel_active)
83                         clk_disable(msm_dmov_clk);
84                 if (list_empty(&active_commands[id]))
85                         PRINT_ERROR("msm_dmov_enqueue_cmd(%d), error datamover stalled, status %x\n", id, status);
86
87                 PRINT_IO("msm_dmov_enqueue_cmd(%d), enqueue command, status %x\n", id, status);
88                 list_add_tail(&cmd->list, &ready_commands[id]);
89         }
90         spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
91 }
92
93 struct msm_dmov_exec_cmdptr_cmd {
94         struct msm_dmov_cmd dmov_cmd;
95         struct completion complete;
96         unsigned id;
97         unsigned int result;
98         struct msm_dmov_errdata err;
99 };
100
101 static void
102 dmov_exec_cmdptr_complete_func(struct msm_dmov_cmd *_cmd,
103                                unsigned int result,
104                                struct msm_dmov_errdata *err)
105 {
106         struct msm_dmov_exec_cmdptr_cmd *cmd = container_of(_cmd, struct msm_dmov_exec_cmdptr_cmd, dmov_cmd);
107         cmd->result = result;
108         if (result != 0x80000002 && err)
109                 memcpy(&cmd->err, err, sizeof(struct msm_dmov_errdata));
110
111         complete(&cmd->complete);
112 }
113
114 int msm_dmov_exec_cmd(unsigned id, unsigned int cmdptr)
115 {
116         struct msm_dmov_exec_cmdptr_cmd cmd;
117
118         PRINT_FLOW("dmov_exec_cmdptr(%d, %x)\n", id, cmdptr);
119
120         cmd.dmov_cmd.cmdptr = cmdptr;
121         cmd.dmov_cmd.complete_func = dmov_exec_cmdptr_complete_func;
122         cmd.dmov_cmd.execute_func = NULL;
123         cmd.id = id;
124         init_completion(&cmd.complete);
125
126         msm_dmov_enqueue_cmd(id, &cmd.dmov_cmd);
127         wait_for_completion(&cmd.complete);
128
129         if (cmd.result != 0x80000002) {
130                 PRINT_ERROR("dmov_exec_cmdptr(%d): ERROR, result: %x\n", id, cmd.result);
131                 PRINT_ERROR("dmov_exec_cmdptr(%d):  flush: %x %x %x %x\n",
132                         id, cmd.err.flush[0], cmd.err.flush[1], cmd.err.flush[2], cmd.err.flush[3]);
133                 return -EIO;
134         }
135         PRINT_FLOW("dmov_exec_cmdptr(%d, %x) done\n", id, cmdptr);
136         return 0;
137 }
138
139
140 static irqreturn_t msm_datamover_irq_handler(int irq, void *dev_id)
141 {
142         unsigned int int_status, mask, id;
143         unsigned long irq_flags;
144         unsigned int ch_status;
145         unsigned int ch_result;
146         struct msm_dmov_cmd *cmd;
147
148         spin_lock_irqsave(&msm_dmov_lock, irq_flags);
149
150         int_status = readl(DMOV_ISR); /* read and clear interrupt */
151         PRINT_FLOW("msm_datamover_irq_handler: DMOV_ISR %x\n", int_status);
152
153         while (int_status) {
154                 mask = int_status & -int_status;
155                 id = fls(mask) - 1;
156                 PRINT_FLOW("msm_datamover_irq_handler %08x %08x id %d\n", int_status, mask, id);
157                 int_status &= ~mask;
158                 ch_status = readl(DMOV_STATUS(id));
159                 if (!(ch_status & DMOV_STATUS_RSLT_VALID)) {
160                         PRINT_FLOW("msm_datamover_irq_handler id %d, result not valid %x\n", id, ch_status);
161                         continue;
162                 }
163                 do {
164                         ch_result = readl(DMOV_RSLT(id));
165                         if (list_empty(&active_commands[id])) {
166                                 PRINT_ERROR("msm_datamover_irq_handler id %d, got result "
167                                         "with no active command, status %x, result %x\n",
168                                         id, ch_status, ch_result);
169                                 cmd = NULL;
170                         } else
171                                 cmd = list_entry(active_commands[id].next, typeof(*cmd), list);
172                         PRINT_FLOW("msm_datamover_irq_handler id %d, status %x, result %x\n", id, ch_status, ch_result);
173                         if (ch_result & DMOV_RSLT_DONE) {
174                                 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n",
175                                         id, ch_status);
176                                 PRINT_IO("msm_datamover_irq_handler id %d, got result "
177                                         "for %p, result %x\n", id, cmd, ch_result);
178                                 if (cmd) {
179                                         list_del(&cmd->list);
180                                         dsb();
181                                         cmd->complete_func(cmd, ch_result, NULL);
182                                 }
183                         }
184                         if (ch_result & DMOV_RSLT_FLUSH) {
185                                 struct msm_dmov_errdata errdata;
186
187                                 errdata.flush[0] = readl(DMOV_FLUSH0(id));
188                                 errdata.flush[1] = readl(DMOV_FLUSH1(id));
189                                 errdata.flush[2] = readl(DMOV_FLUSH2(id));
190                                 errdata.flush[3] = readl(DMOV_FLUSH3(id));
191                                 errdata.flush[4] = readl(DMOV_FLUSH4(id));
192                                 errdata.flush[5] = readl(DMOV_FLUSH5(id));
193                                 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
194                                 PRINT_FLOW("msm_datamover_irq_handler id %d, flush, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
195                                 if (cmd) {
196                                         list_del(&cmd->list);
197                                         dsb();
198                                         cmd->complete_func(cmd, ch_result, &errdata);
199                                 }
200                         }
201                         if (ch_result & DMOV_RSLT_ERROR) {
202                                 struct msm_dmov_errdata errdata;
203
204                                 errdata.flush[0] = readl(DMOV_FLUSH0(id));
205                                 errdata.flush[1] = readl(DMOV_FLUSH1(id));
206                                 errdata.flush[2] = readl(DMOV_FLUSH2(id));
207                                 errdata.flush[3] = readl(DMOV_FLUSH3(id));
208                                 errdata.flush[4] = readl(DMOV_FLUSH4(id));
209                                 errdata.flush[5] = readl(DMOV_FLUSH5(id));
210
211                                 PRINT_ERROR("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
212                                 PRINT_ERROR("msm_datamover_irq_handler id %d, error, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
213                                 if (cmd) {
214                                         list_del(&cmd->list);
215                                         dsb();
216                                         cmd->complete_func(cmd, ch_result, &errdata);
217                                 }
218                                 /* this does not seem to work, once we get an error */
219                                 /* the datamover will no longer accept commands */
220                                 writel(0, DMOV_FLUSH0(id));
221                         }
222                         ch_status = readl(DMOV_STATUS(id));
223                         PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
224                         if ((ch_status & DMOV_STATUS_CMD_PTR_RDY) && !list_empty(&ready_commands[id])) {
225                                 cmd = list_entry(ready_commands[id].next, typeof(*cmd), list);
226                                 list_del(&cmd->list);
227                                 list_add_tail(&cmd->list, &active_commands[id]);
228                                 if (cmd->execute_func)
229                                         cmd->execute_func(cmd);
230                                 PRINT_FLOW("msm_datamover_irq_handler id %d, start command\n", id);
231                                 writel(cmd->cmdptr, DMOV_CMD_PTR(id));
232                         }
233                 } while (ch_status & DMOV_STATUS_RSLT_VALID);
234                 if (list_empty(&active_commands[id]) && list_empty(&ready_commands[id]))
235                         channel_active &= ~(1U << id);
236                 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
237         }
238
239         if (!channel_active) {
240                 disable_irq_nosync(INT_ADM_AARM);
241                 clk_disable(msm_dmov_clk);
242         }
243
244         spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
245         return IRQ_HANDLED;
246 }
247
248 static int __init msm_init_datamover(void)
249 {
250         int i;
251         int ret;
252         struct clk *clk;
253
254         for (i = 0; i < MSM_DMOV_CHANNEL_COUNT; i++) {
255                 INIT_LIST_HEAD(&ready_commands[i]);
256                 INIT_LIST_HEAD(&active_commands[i]);
257                 writel(DMOV_CONFIG_IRQ_EN | DMOV_CONFIG_FORCE_TOP_PTR_RSLT | DMOV_CONFIG_FORCE_FLUSH_RSLT, DMOV_CONFIG(i));
258         }
259         clk = clk_get(NULL, "adm_clk");
260         if (IS_ERR(clk))
261                 return PTR_ERR(clk);
262         msm_dmov_clk = clk;
263         ret = request_irq(INT_ADM_AARM, msm_datamover_irq_handler, 0, "msmdatamover", NULL);
264         if (ret)
265                 return ret;
266         disable_irq(INT_ADM_AARM);
267         return 0;
268 }
269
270 arch_initcall(msm_init_datamover);
271