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 #include <mach/msm_iomap.h>
  23
  24 #define MSM_DMOV_CHANNEL_COUNT 16
  25
  26 #define DMOV_SD0(off, ch) (MSM_DMOV_BASE + 0x0000 + (off) + ((ch) << 2))
  27 #define DMOV_SD1(off, ch) (MSM_DMOV_BASE + 0x0400 + (off) + ((ch) << 2))
  28 #define DMOV_SD2(off, ch) (MSM_DMOV_BASE + 0x0800 + (off) + ((ch) << 2))
  29 #define DMOV_SD3(off, ch) (MSM_DMOV_BASE + 0x0C00 + (off) + ((ch) << 2))
  30
  31 #if defined(CONFIG_ARCH_MSM7X30)
  32 #define DMOV_SD_AARM DMOV_SD2
  33 #else
  34 #define DMOV_SD_AARM DMOV_SD3
  35 #endif
  36
  37 #define DMOV_CMD_PTR(ch)      DMOV_SD_AARM(0x000, ch)
  38 #define DMOV_RSLT(ch)         DMOV_SD_AARM(0x040, ch)
  39 #define DMOV_FLUSH0(ch)       DMOV_SD_AARM(0x080, ch)
  40 #define DMOV_FLUSH1(ch)       DMOV_SD_AARM(0x0C0, ch)
  41 #define DMOV_FLUSH2(ch)       DMOV_SD_AARM(0x100, ch)
  42 #define DMOV_FLUSH3(ch)       DMOV_SD_AARM(0x140, ch)
  43 #define DMOV_FLUSH4(ch)       DMOV_SD_AARM(0x180, ch)
  44 #define DMOV_FLUSH5(ch)       DMOV_SD_AARM(0x1C0, ch)
  45
  46 #define DMOV_STATUS(ch)       DMOV_SD_AARM(0x200, ch)
  47 #define DMOV_ISR              DMOV_SD_AARM(0x380, 0)
  48
  49 #define DMOV_CONFIG(ch)       DMOV_SD_AARM(0x300, ch)
  50
  51 enum {
  52         MSM_DMOV_PRINT_ERRORS = 1,
  53         MSM_DMOV_PRINT_IO = 2,
  54         MSM_DMOV_PRINT_FLOW = 4
  55 };
  56
  57 static DEFINE_SPINLOCK(msm_dmov_lock);
  58 static struct clk *msm_dmov_clk;
  59 static unsigned int channel_active;
  60 static struct list_head ready_commands[MSM_DMOV_CHANNEL_COUNT];
  61 static struct list_head active_commands[MSM_DMOV_CHANNEL_COUNT];
  62 unsigned int msm_dmov_print_mask = MSM_DMOV_PRINT_ERRORS;
  63
  64 #define MSM_DMOV_DPRINTF(mask, format, args...) \
  65         do { \
  66                 if ((mask) & msm_dmov_print_mask) \
  67                         printk(KERN_ERR format, args); \
  68         } while (0)
  69 #define PRINT_ERROR(format, args...) \
  70         MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_ERRORS, format, args);
  71 #define PRINT_IO(format, args...) \
  72         MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_IO, format, args);
  73 #define PRINT_FLOW(format, args...) \
  74         MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_FLOW, format, args);
  75
  76 void msm_dmov_stop_cmd(unsigned id, struct msm_dmov_cmd *cmd, int graceful)
  77 {
  78         writel((graceful << 31), DMOV_FLUSH0(id));
  79 }
  80
  81 void msm_dmov_enqueue_cmd(unsigned id, struct msm_dmov_cmd *cmd)
  82 {
  83         unsigned long irq_flags;
  84         unsigned int status;
  85
  86         spin_lock_irqsave(&msm_dmov_lock, irq_flags);
  87         if (!channel_active)
  88                 clk_enable(msm_dmov_clk);
  89         dsb();
  90         status = readl(DMOV_STATUS(id));
  91         if (list_empty(&ready_commands[id]) &&
  92                 (status & DMOV_STATUS_CMD_PTR_RDY)) {
  93 #if 0
  94                 if (list_empty(&active_commands[id])) {
  95                         PRINT_FLOW("msm_dmov_enqueue_cmd(%d), enable interrupt\n", id);
  96                         writel(DMOV_CONFIG_IRQ_EN, DMOV_CONFIG(id));
  97                 }
  98 #endif
  99                 if (cmd->execute_func)
 100                         cmd->execute_func(cmd);
 101                 PRINT_IO("msm_dmov_enqueue_cmd(%d), start command, status %x\n", id, status);
 102                 list_add_tail(&cmd->list, &active_commands[id]);
 103                 if (!channel_active)
 104                         enable_irq(INT_ADM_AARM);
 105                 channel_active |= 1U << id;
 106                 writel(cmd->cmdptr, DMOV_CMD_PTR(id));
 107         } else {
 108                 if (!channel_active)
 109                         clk_disable(msm_dmov_clk);
 110                 if (list_empty(&active_commands[id]))
 111                         PRINT_ERROR("msm_dmov_enqueue_cmd(%d), error datamover stalled, status %x\n", id, status);
 112
 113                 PRINT_IO("msm_dmov_enqueue_cmd(%d), enqueue command, status %x\n", id, status);
 114                 list_add_tail(&cmd->list, &ready_commands[id]);
 115         }
 116         spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
 117 }
 118
 119 struct msm_dmov_exec_cmdptr_cmd {
 120         struct msm_dmov_cmd dmov_cmd;
 121         struct completion complete;
 122         unsigned id;
 123         unsigned int result;
 124         struct msm_dmov_errdata err;
 125 };
 126
 127 static void
 128 dmov_exec_cmdptr_complete_func(struct msm_dmov_cmd *_cmd,
 129                                unsigned int result,
 130                                struct msm_dmov_errdata *err)
 131 {
 132         struct msm_dmov_exec_cmdptr_cmd *cmd = container_of(_cmd, struct msm_dmov_exec_cmdptr_cmd, dmov_cmd);
 133         cmd->result = result;
 134         if (result != 0x80000002 && err)
 135                 memcpy(&cmd->err, err, sizeof(struct msm_dmov_errdata));
 136
 137         complete(&cmd->complete);
 138 }
 139
 140 int msm_dmov_exec_cmd(unsigned id, unsigned int cmdptr)
 141 {
 142         struct msm_dmov_exec_cmdptr_cmd cmd;
 143
 144         PRINT_FLOW("dmov_exec_cmdptr(%d, %x)\n", id, cmdptr);
 145
 146         cmd.dmov_cmd.cmdptr = cmdptr;
 147         cmd.dmov_cmd.complete_func = dmov_exec_cmdptr_complete_func;
 148         cmd.dmov_cmd.execute_func = NULL;
 149         cmd.id = id;
 150         init_completion(&cmd.complete);
 151
 152         msm_dmov_enqueue_cmd(id, &cmd.dmov_cmd);
 153         wait_for_completion(&cmd.complete);
 154
 155         if (cmd.result != 0x80000002) {
 156                 PRINT_ERROR("dmov_exec_cmdptr(%d): ERROR, result: %x\n", id, cmd.result);
 157                 PRINT_ERROR("dmov_exec_cmdptr(%d):  flush: %x %x %x %x\n",
 158                         id, cmd.err.flush[0], cmd.err.flush[1], cmd.err.flush[2], cmd.err.flush[3]);
 159                 return -EIO;
 160         }
 161         PRINT_FLOW("dmov_exec_cmdptr(%d, %x) done\n", id, cmdptr);
 162         return 0;
 163 }
 164
 165
 166 static irqreturn_t msm_datamover_irq_handler(int irq, void *dev_id)
 167 {
 168         unsigned int int_status, mask, id;
 169         unsigned long irq_flags;
 170         unsigned int ch_status;
 171         unsigned int ch_result;
 172         struct msm_dmov_cmd *cmd;
 173
 174         spin_lock_irqsave(&msm_dmov_lock, irq_flags);
 175
 176         int_status = readl(DMOV_ISR); /* read and clear interrupt */
 177         PRINT_FLOW("msm_datamover_irq_handler: DMOV_ISR %x\n", int_status);
 178
 179         while (int_status) {
 180                 mask = int_status & -int_status;
 181                 id = fls(mask) - 1;
 182                 PRINT_FLOW("msm_datamover_irq_handler %08x %08x id %d\n", int_status, mask, id);
 183                 int_status &= ~mask;
 184                 ch_status = readl(DMOV_STATUS(id));
 185                 if (!(ch_status & DMOV_STATUS_RSLT_VALID)) {
 186                         PRINT_FLOW("msm_datamover_irq_handler id %d, result not valid %x\n", id, ch_status);
 187                         continue;
 188                 }
 189                 do {
 190                         ch_result = readl(DMOV_RSLT(id));
 191                         if (list_empty(&active_commands[id])) {
 192                                 PRINT_ERROR("msm_datamover_irq_handler id %d, got result "
 193                                         "with no active command, status %x, result %x\n",
 194                                         id, ch_status, ch_result);
 195                                 cmd = NULL;
 196                         } else
 197                                 cmd = list_entry(active_commands[id].next, typeof(*cmd), list);
 198                         PRINT_FLOW("msm_datamover_irq_handler id %d, status %x, result %x\n", id, ch_status, ch_result);
 199                         if (ch_result & DMOV_RSLT_DONE) {
 200                                 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n",
 201                                         id, ch_status);
 202                                 PRINT_IO("msm_datamover_irq_handler id %d, got result "
 203                                         "for %p, result %x\n", id, cmd, ch_result);
 204                                 if (cmd) {
 205                                         list_del(&cmd->list);
 206                                         dsb();
 207                                         cmd->complete_func(cmd, ch_result, NULL);
 208                                 }
 209                         }
 210                         if (ch_result & DMOV_RSLT_FLUSH) {
 211                                 struct msm_dmov_errdata errdata;
 212
 213                                 errdata.flush[0] = readl(DMOV_FLUSH0(id));
 214                                 errdata.flush[1] = readl(DMOV_FLUSH1(id));
 215                                 errdata.flush[2] = readl(DMOV_FLUSH2(id));
 216                                 errdata.flush[3] = readl(DMOV_FLUSH3(id));
 217                                 errdata.flush[4] = readl(DMOV_FLUSH4(id));
 218                                 errdata.flush[5] = readl(DMOV_FLUSH5(id));
 219                                 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
 220                                 PRINT_FLOW("msm_datamover_irq_handler id %d, flush, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
 221                                 if (cmd) {
 222                                         list_del(&cmd->list);
 223                                         dsb();
 224                                         cmd->complete_func(cmd, ch_result, &errdata);
 225                                 }
 226                         }
 227                         if (ch_result & DMOV_RSLT_ERROR) {
 228                                 struct msm_dmov_errdata errdata;
 229
 230                                 errdata.flush[0] = readl(DMOV_FLUSH0(id));
 231                                 errdata.flush[1] = readl(DMOV_FLUSH1(id));
 232                                 errdata.flush[2] = readl(DMOV_FLUSH2(id));
 233                                 errdata.flush[3] = readl(DMOV_FLUSH3(id));
 234                                 errdata.flush[4] = readl(DMOV_FLUSH4(id));
 235                                 errdata.flush[5] = readl(DMOV_FLUSH5(id));
 236
 237                                 PRINT_ERROR("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
 238                                 PRINT_ERROR("msm_datamover_irq_handler id %d, error, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
 239                                 if (cmd) {
 240                                         list_del(&cmd->list);
 241                                         dsb();
 242                                         cmd->complete_func(cmd, ch_result, &errdata);
 243                                 }
 244                                 /* this does not seem to work, once we get an error */
 245                                 /* the datamover will no longer accept commands */
 246                                 writel(0, DMOV_FLUSH0(id));
 247                         }
 248                         ch_status = readl(DMOV_STATUS(id));
 249                         PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
 250                         if ((ch_status & DMOV_STATUS_CMD_PTR_RDY) && !list_empty(&ready_commands[id])) {
 251                                 cmd = list_entry(ready_commands[id].next, typeof(*cmd), list);
 252                                 list_move_tail(&cmd->list, &active_commands[id]);
 253                                 if (cmd->execute_func)
 254                                         cmd->execute_func(cmd);
 255                                 PRINT_FLOW("msm_datamover_irq_handler id %d, start command\n", id);
 256                                 writel(cmd->cmdptr, DMOV_CMD_PTR(id));
 257                         }
 258                 } while (ch_status & DMOV_STATUS_RSLT_VALID);
 259                 if (list_empty(&active_commands[id]) && list_empty(&ready_commands[id]))
 260                         channel_active &= ~(1U << id);
 261                 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
 262         }
 263
 264         if (!channel_active) {
 265                 disable_irq_nosync(INT_ADM_AARM);
 266                 clk_disable(msm_dmov_clk);
 267         }
 268
 269         spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
 270         return IRQ_HANDLED;
 271 }
 272
 273 static int __init msm_init_datamover(void)
 274 {
 275         int i;
 276         int ret;
 277         struct clk *clk;
 278
 279         for (i = 0; i < MSM_DMOV_CHANNEL_COUNT; i++) {
 280                 INIT_LIST_HEAD(&ready_commands[i]);
 281                 INIT_LIST_HEAD(&active_commands[i]);
 282                 writel(DMOV_CONFIG_IRQ_EN | DMOV_CONFIG_FORCE_TOP_PTR_RSLT | DMOV_CONFIG_FORCE_FLUSH_RSLT, DMOV_CONFIG(i));
 283         }
 284         clk = clk_get(NULL, "adm_clk");
 285         if (IS_ERR(clk))
 286                 return PTR_ERR(clk);
 287         clk_prepare(clk);
 288         msm_dmov_clk = clk;
 289         ret = request_irq(INT_ADM_AARM, msm_datamover_irq_handler, 0, "msmdatamover", NULL);
 290         if (ret)
 291                 return ret;
 292         disable_irq(INT_ADM_AARM);
 293         return 0;
 294 }
 295 module_init(msm_init_datamover);