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   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 <asm/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 struct msm_dmov_cmd active_command;
  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_enqueue_cmd(unsigned id, struct msm_dmov_cmd *cmd)
  47 {
  48         unsigned long irq_flags;
  49         unsigned int status;
  50
  51         spin_lock_irqsave(&msm_dmov_lock, irq_flags);
  52         status = readl(DMOV_STATUS(id));
  53         if (list_empty(&ready_commands[id]) &&
  54                 (status & DMOV_STATUS_CMD_PTR_RDY)) {
  55 #if 0
  56                 if (list_empty(&active_commands[id])) {
  57                         PRINT_FLOW("msm_dmov_enqueue_cmd(%d), enable interrupt\n", id);
  58                         writel(DMOV_CONFIG_IRQ_EN, DMOV_CONFIG(id));
  59                 }
  60 #endif
  61                 PRINT_IO("msm_dmov_enqueue_cmd(%d), start command, status %x\n", id, status);
  62                 list_add_tail(&cmd->list, &active_commands[id]);
  63                 writel(cmd->cmdptr, DMOV_CMD_PTR(id));
  64         } else {
  65                 if (list_empty(&active_commands[id]))
  66                         PRINT_ERROR("msm_dmov_enqueue_cmd(%d), error datamover stalled, status %x\n", id, status);
  67
  68                 PRINT_IO("msm_dmov_enqueue_cmd(%d), enqueue command, status %x\n", id, status);
  69                 list_add_tail(&cmd->list, &ready_commands[id]);
  70         }
  71         spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
  72 }
  73
  74 struct msm_dmov_exec_cmdptr_cmd {
  75         struct msm_dmov_cmd dmov_cmd;
  76         struct completion complete;
  77         unsigned id;
  78         unsigned int result;
  79         unsigned int flush[6];
  80 };
  81
  82 static void dmov_exec_cmdptr_complete_func(struct msm_dmov_cmd *_cmd, unsigned int result)
  83 {
  84         struct msm_dmov_exec_cmdptr_cmd *cmd = container_of(_cmd, struct msm_dmov_exec_cmdptr_cmd, dmov_cmd);
  85         cmd->result = result;
  86         if (result != 0x80000002) {
  87                 cmd->flush[0] = readl(DMOV_FLUSH0(cmd->id));
  88                 cmd->flush[1] = readl(DMOV_FLUSH1(cmd->id));
  89                 cmd->flush[2] = readl(DMOV_FLUSH2(cmd->id));
  90                 cmd->flush[3] = readl(DMOV_FLUSH3(cmd->id));
  91                 cmd->flush[4] = readl(DMOV_FLUSH4(cmd->id));
  92                 cmd->flush[5] = readl(DMOV_FLUSH5(cmd->id));
  93         }
  94         complete(&cmd->complete);
  95 }
  96
  97 int msm_dmov_exec_cmd(unsigned id, unsigned int cmdptr)
  98 {
  99         struct msm_dmov_exec_cmdptr_cmd cmd;
 100
 101         PRINT_FLOW("dmov_exec_cmdptr(%d, %x)\n", id, cmdptr);
 102
 103         cmd.dmov_cmd.cmdptr = cmdptr;
 104         cmd.dmov_cmd.complete_func = dmov_exec_cmdptr_complete_func;
 105         cmd.id = id;
 106         init_completion(&cmd.complete);
 107
 108         msm_dmov_enqueue_cmd(id, &cmd.dmov_cmd);
 109         wait_for_completion(&cmd.complete);
 110
 111         if (cmd.result != 0x80000002) {
 112                 PRINT_ERROR("dmov_exec_cmdptr(%d): ERROR, result: %x\n", id, cmd.result);
 113                 PRINT_ERROR("dmov_exec_cmdptr(%d):  flush: %x %x %x %x\n",
 114                         id, cmd.flush[0], cmd.flush[1], cmd.flush[2], cmd.flush[3]);
 115                 return -EIO;
 116         }
 117         PRINT_FLOW("dmov_exec_cmdptr(%d, %x) done\n", id, cmdptr);
 118         return 0;
 119 }
 120
 121
 122 static irqreturn_t msm_datamover_irq_handler(int irq, void *dev_id)
 123 {
 124         unsigned int int_status, mask, id;
 125         unsigned long irq_flags;
 126         unsigned int ch_status;
 127         unsigned int ch_result;
 128         struct msm_dmov_cmd *cmd;
 129
 130         spin_lock_irqsave(&msm_dmov_lock, irq_flags);
 131
 132         int_status = readl(DMOV_ISR); /* read and clear interrupt */
 133         PRINT_FLOW("msm_datamover_irq_handler: DMOV_ISR %x\n", int_status);
 134
 135         while (int_status) {
 136                 mask = int_status & -int_status;
 137                 id = fls(mask) - 1;
 138                 PRINT_FLOW("msm_datamover_irq_handler %08x %08x id %d\n", int_status, mask, id);
 139                 int_status &= ~mask;
 140                 ch_status = readl(DMOV_STATUS(id));
 141                 if (!(ch_status & DMOV_STATUS_RSLT_VALID)) {
 142                         PRINT_FLOW("msm_datamover_irq_handler id %d, result not valid %x\n", id, ch_status);
 143                         continue;
 144                 }
 145                 do {
 146                         ch_result = readl(DMOV_RSLT(id));
 147                         if (list_empty(&active_commands[id])) {
 148                                 PRINT_ERROR("msm_datamover_irq_handler id %d, got result "
 149                                         "with no active command, status %x, result %x\n",
 150                                         id, ch_status, ch_result);
 151                                 cmd = NULL;
 152                         } else
 153                                 cmd = list_entry(active_commands[id].next, typeof(*cmd), list);
 154                         PRINT_FLOW("msm_datamover_irq_handler id %d, status %x, result %x\n", id, ch_status, ch_result);
 155                         if (ch_result & DMOV_RSLT_DONE) {
 156                                 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n",
 157                                         id, ch_status);
 158                                 PRINT_IO("msm_datamover_irq_handler id %d, got result "
 159                                         "for %p, result %x\n", id, cmd, ch_result);
 160                                 if (cmd) {
 161                                         list_del(&cmd->list);
 162                                         cmd->complete_func(cmd, ch_result);
 163                                 }
 164                         }
 165                         if (ch_result & DMOV_RSLT_FLUSH) {
 166                                 unsigned int flush0 = readl(DMOV_FLUSH0(id));
 167                                 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
 168                                 PRINT_FLOW("msm_datamover_irq_handler id %d, flush, result %x, flush0 %x\n", id, ch_result, flush0);
 169                                 if (cmd) {
 170                                         list_del(&cmd->list);
 171                                         cmd->complete_func(cmd, ch_result);
 172                                 }
 173                         }
 174                         if (ch_result & DMOV_RSLT_ERROR) {
 175                                 unsigned int flush0 = readl(DMOV_FLUSH0(id));
 176                                 PRINT_ERROR("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
 177                                 PRINT_ERROR("msm_datamover_irq_handler id %d, error, result %x, flush0 %x\n", id, ch_result, flush0);
 178                                 if (cmd) {
 179                                         list_del(&cmd->list);
 180                                         cmd->complete_func(cmd, ch_result);
 181                                 }
 182                                 /* this does not seem to work, once we get an error */
 183                                 /* the datamover will no longer accept commands */
 184                                 writel(0, DMOV_FLUSH0(id));
 185                         }
 186                         ch_status = readl(DMOV_STATUS(id));
 187                         PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
 188                         if ((ch_status & DMOV_STATUS_CMD_PTR_RDY) && !list_empty(&ready_commands[id])) {
 189                                 cmd = list_entry(ready_commands[id].next, typeof(*cmd), list);
 190                                 list_del(&cmd->list);
 191                                 list_add_tail(&cmd->list, &active_commands[id]);
 192                                 PRINT_FLOW("msm_datamover_irq_handler id %d, start command\n", id);
 193                                 writel(cmd->cmdptr, DMOV_CMD_PTR(id));
 194                         }
 195                 } while (ch_status & DMOV_STATUS_RSLT_VALID);
 196                 PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
 197         }
 198         spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
 199         return IRQ_HANDLED;
 200 }
 201
 202 static int __init msm_init_datamover(void)
 203 {
 204         int i;
 205         for (i = 0; i < MSM_DMOV_CHANNEL_COUNT; i++) {
 206                 INIT_LIST_HEAD(&ready_commands[i]);
 207                 INIT_LIST_HEAD(&active_commands[i]);
 208                 writel(DMOV_CONFIG_IRQ_EN | DMOV_CONFIG_FORCE_TOP_PTR_RSLT | DMOV_CONFIG_FORCE_FLUSH_RSLT, DMOV_CONFIG(i));
 209         }
 210         return request_irq(INT_ADM_AARM, msm_datamover_irq_handler, 0, "msmdatamover", NULL);
 211 }
 212
 213 arch_initcall(msm_init_datamover);
 214