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 <linux/module.h>
  22 #include <mach/dma.h>
  23 #include <mach/msm_iomap.h>
  24
  25 #define MSM_DMOV_CHANNEL_COUNT 16
  26
  27 #define DMOV_SD0(off, ch) (MSM_DMOV_BASE + 0x0000 + (off) + ((ch) << 2))
  28 #define DMOV_SD1(off, ch) (MSM_DMOV_BASE + 0x0400 + (off) + ((ch) << 2))
  29 #define DMOV_SD2(off, ch) (MSM_DMOV_BASE + 0x0800 + (off) + ((ch) << 2))
  30 #define DMOV_SD3(off, ch) (MSM_DMOV_BASE + 0x0C00 + (off) + ((ch) << 2))
  31
  32 #if defined(CONFIG_ARCH_MSM7X30)
  33 #define DMOV_SD_AARM DMOV_SD2
  34 #else
  35 #define DMOV_SD_AARM DMOV_SD3
  36 #endif
  37
  38 #define DMOV_CMD_PTR(ch)      DMOV_SD_AARM(0x000, ch)
  39 #define DMOV_RSLT(ch)         DMOV_SD_AARM(0x040, ch)
  40 #define DMOV_FLUSH0(ch)       DMOV_SD_AARM(0x080, ch)
  41 #define DMOV_FLUSH1(ch)       DMOV_SD_AARM(0x0C0, ch)
  42 #define DMOV_FLUSH2(ch)       DMOV_SD_AARM(0x100, ch)
  43 #define DMOV_FLUSH3(ch)       DMOV_SD_AARM(0x140, ch)
  44 #define DMOV_FLUSH4(ch)       DMOV_SD_AARM(0x180, ch)
  45 #define DMOV_FLUSH5(ch)       DMOV_SD_AARM(0x1C0, ch)
  46
  47 #define DMOV_STATUS(ch)       DMOV_SD_AARM(0x200, ch)
  48 #define DMOV_ISR              DMOV_SD_AARM(0x380, 0)
  49
  50 #define DMOV_CONFIG(ch)       DMOV_SD_AARM(0x300, ch)
  51
  52 enum {
  53         MSM_DMOV_PRINT_ERRORS = 1,
  54         MSM_DMOV_PRINT_IO = 2,
  55         MSM_DMOV_PRINT_FLOW = 4
  56 };
  57
  58 static DEFINE_SPINLOCK(msm_dmov_lock);
  59 static struct clk *msm_dmov_clk;
  60 static unsigned int channel_active;
  61 static struct list_head ready_commands[MSM_DMOV_CHANNEL_COUNT];
  62 static struct list_head active_commands[MSM_DMOV_CHANNEL_COUNT];
  63 unsigned int msm_dmov_print_mask = MSM_DMOV_PRINT_ERRORS;
  64
  65 #define MSM_DMOV_DPRINTF(mask, format, args...) \
  66         do { \
  67                 if ((mask) & msm_dmov_print_mask) \
  68                         printk(KERN_ERR format, args); \
  69         } while (0)
  70 #define PRINT_ERROR(format, args...) \
  71         MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_ERRORS, format, args);
  72 #define PRINT_IO(format, args...) \
  73         MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_IO, format, args);
  74 #define PRINT_FLOW(format, args...) \
  75         MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_FLOW, format, args);
  76
  77 void msm_dmov_stop_cmd(unsigned id, struct msm_dmov_cmd *cmd, int graceful)
  78 {
  79         writel((graceful << 31), DMOV_FLUSH0(id));
  80 }
  81 EXPORT_SYMBOL_GPL(msm_dmov_stop_cmd);
  82
  83 void msm_dmov_enqueue_cmd(unsigned id, struct msm_dmov_cmd *cmd)
  84 {
  85         unsigned long irq_flags;
  86         unsigned int status;
  87
  88         spin_lock_irqsave(&msm_dmov_lock, irq_flags);
  89         if (!channel_active)
  90                 clk_enable(msm_dmov_clk);
  91         dsb();
  92         status = readl(DMOV_STATUS(id));
  93         if (list_empty(&ready_commands[id]) &&
  94                 (status & DMOV_STATUS_CMD_PTR_RDY)) {
  95 #if 0
  96                 if (list_empty(&active_commands[id])) {
  97                         PRINT_FLOW("msm_dmov_enqueue_cmd(%d), enable interrupt\n", id);
  98                         writel(DMOV_CONFIG_IRQ_EN, DMOV_CONFIG(id));
  99                 }
 100 #endif
 101                 if (cmd->execute_func)
 102                         cmd->execute_func(cmd);
 103                 PRINT_IO("msm_dmov_enqueue_cmd(%d), start command, status %x\n", id, status);
 104                 list_add_tail(&cmd->list, &active_commands[id]);
 105                 if (!channel_active)
 106                         enable_irq(INT_ADM_AARM);
 107                 channel_active |= 1U << id;
 108                 writel(cmd->cmdptr, DMOV_CMD_PTR(id));
 109         } else {
 110                 if (!channel_active)
 111                         clk_disable(msm_dmov_clk);
 112                 if (list_empty(&active_commands[id]))
 113                         PRINT_ERROR("msm_dmov_enqueue_cmd(%d), error datamover stalled, status %x\n", id, status);
 114
 115                 PRINT_IO("msm_dmov_enqueue_cmd(%d), enqueue command, status %x\n", id, status);
 116                 list_add_tail(&cmd->list, &ready_commands[id]);
 117         }
 118         spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
 119 }
 120 EXPORT_SYMBOL_GPL(msm_dmov_enqueue_cmd);
 121
 122 struct msm_dmov_exec_cmdptr_cmd {
 123         struct msm_dmov_cmd dmov_cmd;
 124         struct completion complete;
 125         unsigned id;
 126         unsigned int result;
 127         struct msm_dmov_errdata err;
 128 };
 129
 130 static void
 131 dmov_exec_cmdptr_complete_func(struct msm_dmov_cmd *_cmd,
 132                                unsigned int result,
 133                                struct msm_dmov_errdata *err)
 134 {
 135         struct msm_dmov_exec_cmdptr_cmd *cmd = container_of(_cmd, struct msm_dmov_exec_cmdptr_cmd, dmov_cmd);
 136         cmd->result = result;
 137         if (result != 0x80000002 && err)
 138                 memcpy(&cmd->err, err, sizeof(struct msm_dmov_errdata));
 139
 140         complete(&cmd->complete);
 141 }
 142
 143 int msm_dmov_exec_cmd(unsigned id, unsigned int cmdptr)
 144 {
 145         struct msm_dmov_exec_cmdptr_cmd cmd;
 146
 147         PRINT_FLOW("dmov_exec_cmdptr(%d, %x)\n", id, cmdptr);
 148
 149         cmd.dmov_cmd.cmdptr = cmdptr;
 150         cmd.dmov_cmd.complete_func = dmov_exec_cmdptr_complete_func;
 151         cmd.dmov_cmd.execute_func = NULL;
 152         cmd.id = id;
 153         init_completion(&cmd.complete);
 154
 155         msm_dmov_enqueue_cmd(id, &cmd.dmov_cmd);
 156         wait_for_completion(&cmd.complete);
 157
 158         if (cmd.result != 0x80000002) {
 159                 PRINT_ERROR("dmov_exec_cmdptr(%d): ERROR, result: %x\n", id, cmd.result);
 160                 PRINT_ERROR("dmov_exec_cmdptr(%d):  flush: %x %x %x %x\n",
 161                         id, cmd.err.flush[0], cmd.err.flush[1], cmd.err.flush[2], cmd.err.flush[3]);
 162                 return -EIO;
 163         }
 164         PRINT_FLOW("dmov_exec_cmdptr(%d, %x) done\n", id, cmdptr);
 165         return 0;
 166 }
 167
 168
 169 static irqreturn_t msm_datamover_irq_handler(int irq, void *dev_id)
 170 {
 171         unsigned int int_status, mask, id;
 172         unsigned long irq_flags;
 173         unsigned int ch_status;
 174         unsigned int ch_result;
 175         struct msm_dmov_cmd *cmd;
 176
 177         spin_lock_irqsave(&msm_dmov_lock, irq_flags);
 178
 179         int_status = readl(DMOV_ISR); /* read and clear interrupt */
 180         PRINT_FLOW("msm_datamover_irq_handler: DMOV_ISR %x\n", int_status);
 181
 182         while (int_status) {
 183                 mask = int_status & -int_status;
 184                 id = fls(mask) - 1;
 185                 PRINT_FLOW("msm_datamover_irq_handler %08x %08x id %d\n", int_status, mask, id);
 186                 int_status &= ~mask;
 187                 ch_status = readl(DMOV_STATUS(id));
 188                 if (!(ch_status & DMOV_STATUS_RSLT_VALID)) {
 189                         PRINT_FLOW("msm_datamover_irq_handler id %d, result not valid %x\n", id, ch_status);
 190                         continue;
 191                 }
 192                 do {
 193                         ch_result = readl(DMOV_RSLT(id));
 194                         if (list_empty(&active_commands[id])) {
 195                                 PRINT_ERROR("msm_datamover_irq_handler id %d, got result "
 196                                         "with no active command, status %x, result %x\n",
 197                                         id, ch_status, ch_result);
 198                                 cmd = NULL;
 199                         } else
 200                                 cmd = list_entry(active_commands[id].next, typeof(*cmd), list);
 201                         PRINT_FLOW("msm_datamover_irq_handler id %d, status %x, result %x\n", id, ch_status, ch_result);
 202                         if (ch_result & DMOV_RSLT_DONE) {
 203                                 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n",
 204                                         id, ch_status);
 205                                 PRINT_IO("msm_datamover_irq_handler id %d, got result "
 206                                         "for %p, result %x\n", id, cmd, ch_result);
 207                                 if (cmd) {
 208                                         list_del(&cmd->list);
 209                                         dsb();
 210                                         cmd->complete_func(cmd, ch_result, NULL);
 211                                 }
 212                         }
 213                         if (ch_result & DMOV_RSLT_FLUSH) {
 214                                 struct msm_dmov_errdata errdata;
 215
 216                                 errdata.flush[0] = readl(DMOV_FLUSH0(id));
 217                                 errdata.flush[1] = readl(DMOV_FLUSH1(id));
 218                                 errdata.flush[2] = readl(DMOV_FLUSH2(id));
 219                                 errdata.flush[3] = readl(DMOV_FLUSH3(id));
 220                                 errdata.flush[4] = readl(DMOV_FLUSH4(id));
 221                                 errdata.flush[5] = readl(DMOV_FLUSH5(id));
 222                                 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
 223                                 PRINT_FLOW("msm_datamover_irq_handler id %d, flush, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
 224                                 if (cmd) {
 225                                         list_del(&cmd->list);
 226                                         dsb();
 227                                         cmd->complete_func(cmd, ch_result, &errdata);
 228                                 }
 229                         }
 230                         if (ch_result & DMOV_RSLT_ERROR) {
 231                                 struct msm_dmov_errdata errdata;
 232
 233                                 errdata.flush[0] = readl(DMOV_FLUSH0(id));
 234                                 errdata.flush[1] = readl(DMOV_FLUSH1(id));
 235                                 errdata.flush[2] = readl(DMOV_FLUSH2(id));
 236                                 errdata.flush[3] = readl(DMOV_FLUSH3(id));
 237                                 errdata.flush[4] = readl(DMOV_FLUSH4(id));
 238                                 errdata.flush[5] = readl(DMOV_FLUSH5(id));
 239
 240                                 PRINT_ERROR("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
 241                                 PRINT_ERROR("msm_datamover_irq_handler id %d, error, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
 242                                 if (cmd) {
 243                                         list_del(&cmd->list);
 244                                         dsb();
 245                                         cmd->complete_func(cmd, ch_result, &errdata);
 246                                 }
 247                                 /* this does not seem to work, once we get an error */
 248                                 /* the datamover will no longer accept commands */
 249                                 writel(0, DMOV_FLUSH0(id));
 250                         }
 251                         ch_status = readl(DMOV_STATUS(id));
 252                         PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
 253                         if ((ch_status & DMOV_STATUS_CMD_PTR_RDY) && !list_empty(&ready_commands[id])) {
 254                                 cmd = list_entry(ready_commands[id].next, typeof(*cmd), list);
 255                                 list_move_tail(&cmd->list, &active_commands[id]);
 256                                 if (cmd->execute_func)
 257                                         cmd->execute_func(cmd);
 258                                 PRINT_FLOW("msm_datamover_irq_handler id %d, start command\n", id);
 259                                 writel(cmd->cmdptr, DMOV_CMD_PTR(id));
 260                         }
 261                 } while (ch_status & DMOV_STATUS_RSLT_VALID);
 262                 if (list_empty(&active_commands[id]) && list_empty(&ready_commands[id]))
 263                         channel_active &= ~(1U << id);
 264                 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
 265         }
 266
 267         if (!channel_active) {
 268                 disable_irq_nosync(INT_ADM_AARM);
 269                 clk_disable(msm_dmov_clk);
 270         }
 271
 272         spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
 273         return IRQ_HANDLED;
 274 }
 275
 276 static int __init msm_init_datamover(void)
 277 {
 278         int i;
 279         int ret;
 280         struct clk *clk;
 281
 282         for (i = 0; i < MSM_DMOV_CHANNEL_COUNT; i++) {
 283                 INIT_LIST_HEAD(&ready_commands[i]);
 284                 INIT_LIST_HEAD(&active_commands[i]);
 285                 writel(DMOV_CONFIG_IRQ_EN | DMOV_CONFIG_FORCE_TOP_PTR_RSLT | DMOV_CONFIG_FORCE_FLUSH_RSLT, DMOV_CONFIG(i));
 286         }
 287         clk = clk_get(NULL, "adm_clk");
 288         if (IS_ERR(clk))
 289                 return PTR_ERR(clk);
 290         clk_prepare(clk);
 291         msm_dmov_clk = clk;
 292         ret = request_irq(INT_ADM_AARM, msm_datamover_irq_handler, 0, "msmdatamover", NULL);
 293         if (ret)
 294                 return ret;
 295         disable_irq(INT_ADM_AARM);
 296         return 0;
 297 }
 298 module_init(msm_init_datamover);