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_move_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