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