271 lines
8.5 KiB
C
271 lines
8.5 KiB
C
/* linux/arch/arm/mach-msm/dma.c
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*
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* Copyright (C) 2007 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/interrupt.h>
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#include <linux/completion.h>
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#include <mach/dma.h>
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#define MSM_DMOV_CHANNEL_COUNT 16
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enum {
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MSM_DMOV_PRINT_ERRORS = 1,
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MSM_DMOV_PRINT_IO = 2,
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MSM_DMOV_PRINT_FLOW = 4
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};
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static DEFINE_SPINLOCK(msm_dmov_lock);
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static struct clk *msm_dmov_clk;
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static unsigned int channel_active;
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static struct list_head ready_commands[MSM_DMOV_CHANNEL_COUNT];
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static struct list_head active_commands[MSM_DMOV_CHANNEL_COUNT];
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unsigned int msm_dmov_print_mask = MSM_DMOV_PRINT_ERRORS;
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#define MSM_DMOV_DPRINTF(mask, format, args...) \
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do { \
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if ((mask) & msm_dmov_print_mask) \
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printk(KERN_ERR format, args); \
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} while (0)
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#define PRINT_ERROR(format, args...) \
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MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_ERRORS, format, args);
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#define PRINT_IO(format, args...) \
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MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_IO, format, args);
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#define PRINT_FLOW(format, args...) \
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MSM_DMOV_DPRINTF(MSM_DMOV_PRINT_FLOW, format, args);
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void msm_dmov_stop_cmd(unsigned id, struct msm_dmov_cmd *cmd, int graceful)
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{
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writel((graceful << 31), DMOV_FLUSH0(id));
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}
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void msm_dmov_enqueue_cmd(unsigned id, struct msm_dmov_cmd *cmd)
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{
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unsigned long irq_flags;
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unsigned int status;
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spin_lock_irqsave(&msm_dmov_lock, irq_flags);
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if (!channel_active)
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clk_enable(msm_dmov_clk);
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dsb();
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status = readl(DMOV_STATUS(id));
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if (list_empty(&ready_commands[id]) &&
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(status & DMOV_STATUS_CMD_PTR_RDY)) {
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#if 0
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if (list_empty(&active_commands[id])) {
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PRINT_FLOW("msm_dmov_enqueue_cmd(%d), enable interrupt\n", id);
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writel(DMOV_CONFIG_IRQ_EN, DMOV_CONFIG(id));
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}
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#endif
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if (cmd->execute_func)
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cmd->execute_func(cmd);
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PRINT_IO("msm_dmov_enqueue_cmd(%d), start command, status %x\n", id, status);
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list_add_tail(&cmd->list, &active_commands[id]);
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if (!channel_active)
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enable_irq(INT_ADM_AARM);
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channel_active |= 1U << id;
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writel(cmd->cmdptr, DMOV_CMD_PTR(id));
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} else {
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if (!channel_active)
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clk_disable(msm_dmov_clk);
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if (list_empty(&active_commands[id]))
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PRINT_ERROR("msm_dmov_enqueue_cmd(%d), error datamover stalled, status %x\n", id, status);
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PRINT_IO("msm_dmov_enqueue_cmd(%d), enqueue command, status %x\n", id, status);
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list_add_tail(&cmd->list, &ready_commands[id]);
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}
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spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
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}
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struct msm_dmov_exec_cmdptr_cmd {
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struct msm_dmov_cmd dmov_cmd;
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struct completion complete;
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unsigned id;
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unsigned int result;
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struct msm_dmov_errdata err;
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};
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static void
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dmov_exec_cmdptr_complete_func(struct msm_dmov_cmd *_cmd,
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unsigned int result,
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struct msm_dmov_errdata *err)
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{
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struct msm_dmov_exec_cmdptr_cmd *cmd = container_of(_cmd, struct msm_dmov_exec_cmdptr_cmd, dmov_cmd);
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cmd->result = result;
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if (result != 0x80000002 && err)
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memcpy(&cmd->err, err, sizeof(struct msm_dmov_errdata));
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complete(&cmd->complete);
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}
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int msm_dmov_exec_cmd(unsigned id, unsigned int cmdptr)
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{
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struct msm_dmov_exec_cmdptr_cmd cmd;
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PRINT_FLOW("dmov_exec_cmdptr(%d, %x)\n", id, cmdptr);
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cmd.dmov_cmd.cmdptr = cmdptr;
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cmd.dmov_cmd.complete_func = dmov_exec_cmdptr_complete_func;
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cmd.dmov_cmd.execute_func = NULL;
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cmd.id = id;
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init_completion(&cmd.complete);
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msm_dmov_enqueue_cmd(id, &cmd.dmov_cmd);
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wait_for_completion(&cmd.complete);
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if (cmd.result != 0x80000002) {
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PRINT_ERROR("dmov_exec_cmdptr(%d): ERROR, result: %x\n", id, cmd.result);
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PRINT_ERROR("dmov_exec_cmdptr(%d): flush: %x %x %x %x\n",
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id, cmd.err.flush[0], cmd.err.flush[1], cmd.err.flush[2], cmd.err.flush[3]);
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return -EIO;
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}
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PRINT_FLOW("dmov_exec_cmdptr(%d, %x) done\n", id, cmdptr);
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return 0;
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}
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static irqreturn_t msm_datamover_irq_handler(int irq, void *dev_id)
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{
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unsigned int int_status, mask, id;
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unsigned long irq_flags;
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unsigned int ch_status;
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unsigned int ch_result;
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struct msm_dmov_cmd *cmd;
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spin_lock_irqsave(&msm_dmov_lock, irq_flags);
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int_status = readl(DMOV_ISR); /* read and clear interrupt */
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PRINT_FLOW("msm_datamover_irq_handler: DMOV_ISR %x\n", int_status);
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while (int_status) {
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mask = int_status & -int_status;
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id = fls(mask) - 1;
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PRINT_FLOW("msm_datamover_irq_handler %08x %08x id %d\n", int_status, mask, id);
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int_status &= ~mask;
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ch_status = readl(DMOV_STATUS(id));
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if (!(ch_status & DMOV_STATUS_RSLT_VALID)) {
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PRINT_FLOW("msm_datamover_irq_handler id %d, result not valid %x\n", id, ch_status);
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continue;
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}
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do {
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ch_result = readl(DMOV_RSLT(id));
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if (list_empty(&active_commands[id])) {
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PRINT_ERROR("msm_datamover_irq_handler id %d, got result "
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"with no active command, status %x, result %x\n",
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id, ch_status, ch_result);
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cmd = NULL;
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} else
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cmd = list_entry(active_commands[id].next, typeof(*cmd), list);
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PRINT_FLOW("msm_datamover_irq_handler id %d, status %x, result %x\n", id, ch_status, ch_result);
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if (ch_result & DMOV_RSLT_DONE) {
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PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n",
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id, ch_status);
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PRINT_IO("msm_datamover_irq_handler id %d, got result "
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"for %p, result %x\n", id, cmd, ch_result);
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if (cmd) {
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list_del(&cmd->list);
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dsb();
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cmd->complete_func(cmd, ch_result, NULL);
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}
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}
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if (ch_result & DMOV_RSLT_FLUSH) {
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struct msm_dmov_errdata errdata;
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errdata.flush[0] = readl(DMOV_FLUSH0(id));
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errdata.flush[1] = readl(DMOV_FLUSH1(id));
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errdata.flush[2] = readl(DMOV_FLUSH2(id));
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errdata.flush[3] = readl(DMOV_FLUSH3(id));
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errdata.flush[4] = readl(DMOV_FLUSH4(id));
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errdata.flush[5] = readl(DMOV_FLUSH5(id));
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PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
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PRINT_FLOW("msm_datamover_irq_handler id %d, flush, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
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if (cmd) {
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list_del(&cmd->list);
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dsb();
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cmd->complete_func(cmd, ch_result, &errdata);
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}
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}
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if (ch_result & DMOV_RSLT_ERROR) {
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struct msm_dmov_errdata errdata;
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errdata.flush[0] = readl(DMOV_FLUSH0(id));
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errdata.flush[1] = readl(DMOV_FLUSH1(id));
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errdata.flush[2] = readl(DMOV_FLUSH2(id));
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errdata.flush[3] = readl(DMOV_FLUSH3(id));
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errdata.flush[4] = readl(DMOV_FLUSH4(id));
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errdata.flush[5] = readl(DMOV_FLUSH5(id));
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PRINT_ERROR("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
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PRINT_ERROR("msm_datamover_irq_handler id %d, error, result %x, flush0 %x\n", id, ch_result, errdata.flush[0]);
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if (cmd) {
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list_del(&cmd->list);
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dsb();
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cmd->complete_func(cmd, ch_result, &errdata);
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}
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/* this does not seem to work, once we get an error */
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/* the datamover will no longer accept commands */
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writel(0, DMOV_FLUSH0(id));
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}
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ch_status = readl(DMOV_STATUS(id));
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PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
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if ((ch_status & DMOV_STATUS_CMD_PTR_RDY) && !list_empty(&ready_commands[id])) {
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cmd = list_entry(ready_commands[id].next, typeof(*cmd), list);
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list_move_tail(&cmd->list, &active_commands[id]);
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if (cmd->execute_func)
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cmd->execute_func(cmd);
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PRINT_FLOW("msm_datamover_irq_handler id %d, start command\n", id);
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writel(cmd->cmdptr, DMOV_CMD_PTR(id));
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}
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} while (ch_status & DMOV_STATUS_RSLT_VALID);
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if (list_empty(&active_commands[id]) && list_empty(&ready_commands[id]))
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channel_active &= ~(1U << id);
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PRINT_FLOW("msm_datamover_irq_handler id %d, status %x\n", id, ch_status);
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}
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if (!channel_active) {
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disable_irq_nosync(INT_ADM_AARM);
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clk_disable(msm_dmov_clk);
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}
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spin_unlock_irqrestore(&msm_dmov_lock, irq_flags);
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return IRQ_HANDLED;
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}
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static int __init msm_init_datamover(void)
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{
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int i;
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int ret;
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struct clk *clk;
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for (i = 0; i < MSM_DMOV_CHANNEL_COUNT; i++) {
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INIT_LIST_HEAD(&ready_commands[i]);
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INIT_LIST_HEAD(&active_commands[i]);
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writel(DMOV_CONFIG_IRQ_EN | DMOV_CONFIG_FORCE_TOP_PTR_RSLT | DMOV_CONFIG_FORCE_FLUSH_RSLT, DMOV_CONFIG(i));
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}
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clk = clk_get(NULL, "adm_clk");
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if (IS_ERR(clk))
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return PTR_ERR(clk);
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msm_dmov_clk = clk;
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ret = request_irq(INT_ADM_AARM, msm_datamover_irq_handler, 0, "msmdatamover", NULL);
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if (ret)
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return ret;
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disable_irq(INT_ADM_AARM);
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return 0;
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}
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arch_initcall(msm_init_datamover);
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