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/io.h>
  17 #include <linux/interrupt.h>
  18 #include <mach/dma.h>
  19
  20 #define MSM_DMOV_CHANNEL_COUNT 16
  21
  22 enum {
  23         MSM_DMOV_PRINT_ERRORS = 1,
  24         MSM_DMOV_PRINT_IO = 2,
  25         MSM_DMOV_PRINT_FLOW = 4
  26 };
  27
  28 static DEFINE_SPINLOCK(msm_dmov_lock);
  29 static unsigned int channel_active;
  30 static struct list_head ready_commands[MSM_DMOV_CHANNEL_COUNT];
  31 static struct list_head active_commands[MSM_DMOV_CHANNEL_COUNT];
  32 unsigned 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
  46 void msm_dmov_stop_cmd(unsigned id, struct msm_dmov_cmd *cmd, int graceful)
  47 {
  48         writel((graceful << 31), DMOV_FLUSH0(id));
  49 }
  50
  51 void 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]);
  68                 if (!channel_active)
  69                         enable_irq(INT_ADM_AARM);
  70                 channel_active |= 1U << id;
  71                 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
  82 struct msm_dmov_exec_cmdptr_cmd {
  83         struct msm_dmov_cmd dmov_cmd;
  84         struct completion complete;
  85         unsigned id;
  86         unsigned int result;
  87         struct msm_dmov_errdata err;
  88 };
  89
  90 static void
  91 dmov_exec_cmdptr_complete_func(struct msm_dmov_cmd *_cmd,
  92                                unsigned int result,
  93                                struct msm_dmov_errdata *err)
  94 {
  95         struct msm_dmov_exec_cmdptr_cmd *cmd = container_of(_cmd, struct msm_dmov_exec_cmdptr_cmd, dmov_cmd);
  96         cmd->result = result;
  97         if (result != 0x80000002 && err)
  98                 memcpy(&cmd->err, err, sizeof(struct msm_dmov_errdata));
  99
 100         complete(&cmd->complete);
 101 }
 102
 103 int 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",
 120                         id, cmd.err.flush[0], cmd.err.flush[1], cmd.err.flush[2], cmd.err.flush[3]);
 121                 return -EIO;
 122         }
 123         PRINT_FLOW("dmov_exec_cmdptr(%d, %x) done\n", id, cmdptr);
 124         return 0;
 125 }
 126
 127
 128 static 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);
 168                                         cmd->complete_func(cmd, ch_result, NULL);
 169                                 }
 170                         }
 171                         if (ch_result & DMOV_RSLT_FLUSH) {
 172                                 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));
 180                                 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
 181                                 PRINT_FLOW("msm_datamover_irq_handler id %d, flush, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
 182                                 if (cmd) {
 183                                         list_del(&cmd->list);
 184                                         cmd->complete_func(cmd, ch_result, &errdata);
 185                                 }
 186                         }
 187                         if (ch_result & DMOV_RSLT_ERROR) {
 188                                 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
 197                                 PRINT_ERROR("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
 198                                 PRINT_ERROR("msm_datamover_irq_handler id %d, error, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
 199                                 if (cmd) {
 200                                         list_del(&cmd->list);
 201                                         cmd->complete_func(cmd, ch_result, &errdata);
 202                                 }
 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);
 217                 if (list_empty(&active_commands[id]) && list_empty(&ready_commands[id]))
 218                         channel_active &= ~(1U << id);
 219                 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
 220         }
 221
 222         if (!channel_active)
 223                 disable_irq(INT_ADM_AARM);
 224
 225         spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
 226         return IRQ_HANDLED;
 227 }
 228
 229 static int __init msm_init_datamover(void)
 230 {
 231         int i;
 232         int ret;
 233         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         }
 238         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;
 243 }
 244
 245 arch_initcall(msm_init_datamover);
 246