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Commit bfe645adf1a79b873b528556523abb46f281a5dc

Authored by Arve Hjønnevåg
Committed by Russell King
1 parent 9e73c84c89

[ARM] msm: dma support for MSM7X00A 

Signed-off-by: Brian Swetland <swetland@google.com>

Showing 3 changed files with 365 additions and 1 deletions Side-by-side Diff

arch/arm/mach-msm/Makefile
Diff comments   View file @ bfe645a
1   -obj-y += io.o idle.o irq.o timer.o
  1 +obj-y += io.o idle.o irq.o timer.o dma.o
2 2  
3 3 # Common code for board init
4 4 obj-y += common.o
arch/arm/mach-msm/dma.c
Diff comments   View file @ bfe645a
  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 <asm/arch/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);
include/asm-arm/arch-msm/dma.h
Diff comments   View file @ bfe645a
  1 +/* linux/include/asm-arm/arch-msm/dma.h
  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 +#ifndef __ASM_ARCH_MSM_DMA_H
  17 +
  18 +#include <linux/list.h>
  19 +#include <asm/arch/msm_iomap.h>
  20 +
  21 +struct msm_dmov_cmd {
  22 + struct list_head list;
  23 + unsigned int cmdptr;
  24 + void (*complete_func)(struct msm_dmov_cmd *cmd, unsigned int result);
  25 +/* void (*user_result_func)(struct msm_dmov_cmd *cmd); */
  26 +};
  27 +
  28 +void msm_dmov_enqueue_cmd(unsigned id, struct msm_dmov_cmd *cmd);
  29 +void msm_dmov_stop_cmd(unsigned id, struct msm_dmov_cmd *cmd);
  30 +int msm_dmov_exec_cmd(unsigned id, unsigned int cmdptr);
  31 +/* int msm_dmov_exec_cmd_etc(unsigned id, unsigned int cmdptr, int timeout, int interruptible); */
  32 +
  33 +
  34 +
  35 +#define DMOV_SD0(off, ch) (MSM_DMOV_BASE + 0x0000 + (off) + ((ch) << 2))
  36 +#define DMOV_SD1(off, ch) (MSM_DMOV_BASE + 0x0400 + (off) + ((ch) << 2))
  37 +#define DMOV_SD2(off, ch) (MSM_DMOV_BASE + 0x0800 + (off) + ((ch) << 2))
  38 +#define DMOV_SD3(off, ch) (MSM_DMOV_BASE + 0x0C00 + (off) + ((ch) << 2))
  39 +
  40 +/* only security domain 3 is available to the ARM11
  41 + * SD0 -> mARM trusted, SD1 -> mARM nontrusted, SD2 -> aDSP, SD3 -> aARM
  42 + */
  43 +
  44 +#define DMOV_CMD_PTR(ch) DMOV_SD3(0x000, ch)
  45 +#define DMOV_CMD_LIST (0 << 29) /* does not work */
  46 +#define DMOV_CMD_PTR_LIST (1 << 29) /* works */
  47 +#define DMOV_CMD_INPUT_CFG (2 << 29) /* untested */
  48 +#define DMOV_CMD_OUTPUT_CFG (3 << 29) /* untested */
  49 +#define DMOV_CMD_ADDR(addr) ((addr) >> 3)
  50 +
  51 +#define DMOV_RSLT(ch) DMOV_SD3(0x040, ch)
  52 +#define DMOV_RSLT_VALID (1 << 31) /* 0 == host has empties result fifo */
  53 +#define DMOV_RSLT_ERROR (1 << 3)
  54 +#define DMOV_RSLT_FLUSH (1 << 2)
  55 +#define DMOV_RSLT_DONE (1 << 1) /* top pointer done */
  56 +#define DMOV_RSLT_USER (1 << 0) /* command with FR force result */
  57 +
  58 +#define DMOV_FLUSH0(ch) DMOV_SD3(0x080, ch)
  59 +#define DMOV_FLUSH1(ch) DMOV_SD3(0x0C0, ch)
  60 +#define DMOV_FLUSH2(ch) DMOV_SD3(0x100, ch)
  61 +#define DMOV_FLUSH3(ch) DMOV_SD3(0x140, ch)
  62 +#define DMOV_FLUSH4(ch) DMOV_SD3(0x180, ch)
  63 +#define DMOV_FLUSH5(ch) DMOV_SD3(0x1C0, ch)
  64 +
  65 +#define DMOV_STATUS(ch) DMOV_SD3(0x200, ch)
  66 +#define DMOV_STATUS_RSLT_COUNT(n) (((n) >> 29))
  67 +#define DMOV_STATUS_CMD_COUNT(n) (((n) >> 27) & 3)
  68 +#define DMOV_STATUS_RSLT_VALID (1 << 1)
  69 +#define DMOV_STATUS_CMD_PTR_RDY (1 << 0)
  70 +
  71 +#define DMOV_ISR DMOV_SD3(0x380, 0)
  72 +
  73 +#define DMOV_CONFIG(ch) DMOV_SD3(0x300, ch)
  74 +#define DMOV_CONFIG_FORCE_TOP_PTR_RSLT (1 << 2)
  75 +#define DMOV_CONFIG_FORCE_FLUSH_RSLT (1 << 1)
  76 +#define DMOV_CONFIG_IRQ_EN (1 << 0)
  77 +
  78 +/* channel assignments */
  79 +
  80 +#define DMOV_NAND_CHAN 7
  81 +#define DMOV_NAND_CRCI_CMD 5
  82 +#define DMOV_NAND_CRCI_DATA 4
  83 +
  84 +#define DMOV_SDC1_CHAN 8
  85 +#define DMOV_SDC1_CRCI 6
  86 +
  87 +#define DMOV_SDC2_CHAN 8
  88 +#define DMOV_SDC2_CRCI 7
  89 +
  90 +#define DMOV_TSIF_CHAN 10
  91 +#define DMOV_TSIF_CRCI 10
  92 +
  93 +#define DMOV_USB_CHAN 11
  94 +
  95 +/* no client rate control ifc (eg, ram) */
  96 +#define DMOV_NONE_CRCI 0
  97 +
  98 +
  99 +/* If the CMD_PTR register has CMD_PTR_LIST selected, the data mover
  100 + * is going to walk a list of 32bit pointers as described below. Each
  101 + * pointer points to a *array* of dmov_s, etc structs. The last pointer
  102 + * in the list is marked with CMD_PTR_LP. The last struct in each array
  103 + * is marked with CMD_LC (see below).
  104 + */
  105 +#define CMD_PTR_ADDR(addr) ((addr) >> 3)
  106 +#define CMD_PTR_LP (1 << 31) /* last pointer */
  107 +#define CMD_PTR_PT (3 << 29) /* ? */
  108 +
  109 +/* Single Item Mode */
  110 +typedef struct {
  111 + unsigned cmd;
  112 + unsigned src;
  113 + unsigned dst;
  114 + unsigned len;
  115 +} dmov_s;
  116 +
  117 +/* Scatter/Gather Mode */
  118 +typedef struct {
  119 + unsigned cmd;
  120 + unsigned src_dscr;
  121 + unsigned dst_dscr;
  122 + unsigned _reserved;
  123 +} dmov_sg;
  124 +
  125 +/* bits for the cmd field of the above structures */
  126 +
  127 +#define CMD_LC (1 << 31) /* last command */
  128 +#define CMD_FR (1 << 22) /* force result -- does not work? */
  129 +#define CMD_OCU (1 << 21) /* other channel unblock */
  130 +#define CMD_OCB (1 << 20) /* other channel block */
  131 +#define CMD_TCB (1 << 19) /* ? */
  132 +#define CMD_DAH (1 << 18) /* destination address hold -- does not work?*/
  133 +#define CMD_SAH (1 << 17) /* source address hold -- does not work? */
  134 +
  135 +#define CMD_MODE_SINGLE (0 << 0) /* dmov_s structure used */
  136 +#define CMD_MODE_SG (1 << 0) /* untested */
  137 +#define CMD_MODE_IND_SG (2 << 0) /* untested */
  138 +#define CMD_MODE_BOX (3 << 0) /* untested */
  139 +
  140 +#define CMD_DST_SWAP_BYTES (1 << 14) /* exchange each byte n with byte n+1 */
  141 +#define CMD_DST_SWAP_SHORTS (1 << 15) /* exchange each short n with short n+1 */
  142 +#define CMD_DST_SWAP_WORDS (1 << 16) /* exchange each word n with word n+1 */
  143 +
  144 +#define CMD_SRC_SWAP_BYTES (1 << 11) /* exchange each byte n with byte n+1 */
  145 +#define CMD_SRC_SWAP_SHORTS (1 << 12) /* exchange each short n with short n+1 */
  146 +#define CMD_SRC_SWAP_WORDS (1 << 13) /* exchange each word n with word n+1 */
  147 +
  148 +#define CMD_DST_CRCI(n) (((n) & 15) << 7)
  149 +#define CMD_SRC_CRCI(n) (((n) & 15) << 3)
  150 +
  151 +#endif