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linux/sound/soc/omap/mcpdm.c
Peter Ujfalusi 3a98cd6b2b ASoC: OMAP4: McPDM: Convert to hwmod/omap_device 
In order to probe, and operate correctly, the OMAP McPDM driver needs to
be converted to use hwmod.
The device name has been changed to probe the driver.
Replace the clk_* with pm_runtime_* calls to manage the clocks correctly.
Missing request_mem_region/release_mem_region added.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>
2011-09-22 09:19:15 +03:00

475 lines
11 KiB
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/*
* mcpdm.c -- McPDM interface driver
*
* Author: Jorge Eduardo Candelaria <x0107209@ti.com>
* Copyright (C) 2009 - Texas Instruments, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/platform_device.h>
#include <linux/wait.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/err.h>
#include <linux/pm_runtime.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/irq.h>
#include "mcpdm.h"
static struct omap_mcpdm *mcpdm;
static inline void omap_mcpdm_write(u16 reg, u32 val)
{
__raw_writel(val, mcpdm->io_base + reg);
}
static inline int omap_mcpdm_read(u16 reg)
{
return __raw_readl(mcpdm->io_base + reg);
}
static void omap_mcpdm_reg_dump(void)
{
dev_dbg(mcpdm->dev, "***********************\n");
dev_dbg(mcpdm->dev, "IRQSTATUS_RAW: 0x%04x\n",
omap_mcpdm_read(MCPDM_IRQSTATUS_RAW));
dev_dbg(mcpdm->dev, "IRQSTATUS: 0x%04x\n",
omap_mcpdm_read(MCPDM_IRQSTATUS));
dev_dbg(mcpdm->dev, "IRQENABLE_SET: 0x%04x\n",
omap_mcpdm_read(MCPDM_IRQENABLE_SET));
dev_dbg(mcpdm->dev, "IRQENABLE_CLR: 0x%04x\n",
omap_mcpdm_read(MCPDM_IRQENABLE_CLR));
dev_dbg(mcpdm->dev, "IRQWAKE_EN: 0x%04x\n",
omap_mcpdm_read(MCPDM_IRQWAKE_EN));
dev_dbg(mcpdm->dev, "DMAENABLE_SET: 0x%04x\n",
omap_mcpdm_read(MCPDM_DMAENABLE_SET));
dev_dbg(mcpdm->dev, "DMAENABLE_CLR: 0x%04x\n",
omap_mcpdm_read(MCPDM_DMAENABLE_CLR));
dev_dbg(mcpdm->dev, "DMAWAKEEN: 0x%04x\n",
omap_mcpdm_read(MCPDM_DMAWAKEEN));
dev_dbg(mcpdm->dev, "CTRL: 0x%04x\n",
omap_mcpdm_read(MCPDM_CTRL));
dev_dbg(mcpdm->dev, "DN_DATA: 0x%04x\n",
omap_mcpdm_read(MCPDM_DN_DATA));
dev_dbg(mcpdm->dev, "UP_DATA: 0x%04x\n",
omap_mcpdm_read(MCPDM_UP_DATA));
dev_dbg(mcpdm->dev, "FIFO_CTRL_DN: 0x%04x\n",
omap_mcpdm_read(MCPDM_FIFO_CTRL_DN));
dev_dbg(mcpdm->dev, "FIFO_CTRL_UP: 0x%04x\n",
omap_mcpdm_read(MCPDM_FIFO_CTRL_UP));
dev_dbg(mcpdm->dev, "DN_OFFSET: 0x%04x\n",
omap_mcpdm_read(MCPDM_DN_OFFSET));
dev_dbg(mcpdm->dev, "***********************\n");
}
/*
* Takes the McPDM module in and out of reset state.
* Uplink and downlink can be reset individually.
*/
static void omap_mcpdm_reset_capture(int reset)
{
int ctrl = omap_mcpdm_read(MCPDM_CTRL);
if (reset)
ctrl |= SW_UP_RST;
else
ctrl &= ~SW_UP_RST;
omap_mcpdm_write(MCPDM_CTRL, ctrl);
}
static void omap_mcpdm_reset_playback(int reset)
{
int ctrl = omap_mcpdm_read(MCPDM_CTRL);
if (reset)
ctrl |= SW_DN_RST;
else
ctrl &= ~SW_DN_RST;
omap_mcpdm_write(MCPDM_CTRL, ctrl);
}
/*
* Enables the transfer through the PDM interface to/from the Phoenix
* codec by enabling the corresponding UP or DN channels.
*/
void omap_mcpdm_start(int stream)
{
int ctrl = omap_mcpdm_read(MCPDM_CTRL);
if (stream)
ctrl |= mcpdm->up_channels;
else
ctrl |= mcpdm->dn_channels;
omap_mcpdm_write(MCPDM_CTRL, ctrl);
}
/*
* Disables the transfer through the PDM interface to/from the Phoenix
* codec by disabling the corresponding UP or DN channels.
*/
void omap_mcpdm_stop(int stream)
{
int ctrl = omap_mcpdm_read(MCPDM_CTRL);
if (stream)
ctrl &= ~mcpdm->up_channels;
else
ctrl &= ~mcpdm->dn_channels;
omap_mcpdm_write(MCPDM_CTRL, ctrl);
}
/*
* Configures McPDM uplink for audio recording.
* This function should be called before omap_mcpdm_start.
*/
int omap_mcpdm_capture_open(struct omap_mcpdm_link *uplink)
{
int irq_mask = 0;
int ctrl;
if (!uplink)
return -EINVAL;
mcpdm->uplink = uplink;
/* Enable irq request generation */
irq_mask |= uplink->irq_mask & MCPDM_UPLINK_IRQ_MASK;
omap_mcpdm_write(MCPDM_IRQENABLE_SET, irq_mask);
/* Configure uplink threshold */
if (uplink->threshold > UP_THRES_MAX)
uplink->threshold = UP_THRES_MAX;
omap_mcpdm_write(MCPDM_FIFO_CTRL_UP, uplink->threshold);
/* Configure DMA controller */
omap_mcpdm_write(MCPDM_DMAENABLE_SET, DMA_UP_ENABLE);
/* Set pdm out format */
ctrl = omap_mcpdm_read(MCPDM_CTRL);
ctrl &= ~PDMOUTFORMAT;
ctrl |= uplink->format & PDMOUTFORMAT;
/* Uplink channels */
mcpdm->up_channels = uplink->channels & (PDM_UP_MASK | PDM_STATUS_MASK);
omap_mcpdm_write(MCPDM_CTRL, ctrl);
return 0;
}
/*
* Configures McPDM downlink for audio playback.
* This function should be called before omap_mcpdm_start.
*/
int omap_mcpdm_playback_open(struct omap_mcpdm_link *downlink)
{
int irq_mask = 0;
int ctrl;
if (!downlink)
return -EINVAL;
mcpdm->downlink = downlink;
/* Enable irq request generation */
irq_mask |= downlink->irq_mask & MCPDM_DOWNLINK_IRQ_MASK;
omap_mcpdm_write(MCPDM_IRQENABLE_SET, irq_mask);
/* Configure uplink threshold */
if (downlink->threshold > DN_THRES_MAX)
downlink->threshold = DN_THRES_MAX;
omap_mcpdm_write(MCPDM_FIFO_CTRL_DN, downlink->threshold);
/* Enable DMA request generation */
omap_mcpdm_write(MCPDM_DMAENABLE_SET, DMA_DN_ENABLE);
/* Set pdm out format */
ctrl = omap_mcpdm_read(MCPDM_CTRL);
ctrl &= ~PDMOUTFORMAT;
ctrl |= downlink->format & PDMOUTFORMAT;
/* Downlink channels */
mcpdm->dn_channels = downlink->channels & (PDM_DN_MASK | PDM_CMD_MASK);
omap_mcpdm_write(MCPDM_CTRL, ctrl);
return 0;
}
/*
* Cleans McPDM uplink configuration.
* This function should be called when the stream is closed.
*/
int omap_mcpdm_capture_close(struct omap_mcpdm_link *uplink)
{
int irq_mask = 0;
if (!uplink)
return -EINVAL;
/* Disable irq request generation */
irq_mask |= uplink->irq_mask & MCPDM_UPLINK_IRQ_MASK;
omap_mcpdm_write(MCPDM_IRQENABLE_CLR, irq_mask);
/* Disable DMA request generation */
omap_mcpdm_write(MCPDM_DMAENABLE_CLR, DMA_UP_ENABLE);
/* Clear Downlink channels */
mcpdm->up_channels = 0;
mcpdm->uplink = NULL;
return 0;
}
/*
* Cleans McPDM downlink configuration.
* This function should be called when the stream is closed.
*/
int omap_mcpdm_playback_close(struct omap_mcpdm_link *downlink)
{
int irq_mask = 0;
if (!downlink)
return -EINVAL;
/* Disable irq request generation */
irq_mask |= downlink->irq_mask & MCPDM_DOWNLINK_IRQ_MASK;
omap_mcpdm_write(MCPDM_IRQENABLE_CLR, irq_mask);
/* Disable DMA request generation */
omap_mcpdm_write(MCPDM_DMAENABLE_CLR, DMA_DN_ENABLE);
/* clear Downlink channels */
mcpdm->dn_channels = 0;
mcpdm->downlink = NULL;
return 0;
}
static irqreturn_t omap_mcpdm_irq_handler(int irq, void *dev_id)
{
struct omap_mcpdm *mcpdm_irq = dev_id;
int irq_status;
irq_status = omap_mcpdm_read(MCPDM_IRQSTATUS);
/* Acknowledge irq event */
omap_mcpdm_write(MCPDM_IRQSTATUS, irq_status);
if (irq & MCPDM_DN_IRQ_FULL) {
dev_err(mcpdm_irq->dev, "DN FIFO error %x\n", irq_status);
omap_mcpdm_reset_playback(1);
omap_mcpdm_playback_open(mcpdm_irq->downlink);
omap_mcpdm_reset_playback(0);
}
if (irq & MCPDM_DN_IRQ_EMPTY) {
dev_err(mcpdm_irq->dev, "DN FIFO error %x\n", irq_status);
omap_mcpdm_reset_playback(1);
omap_mcpdm_playback_open(mcpdm_irq->downlink);
omap_mcpdm_reset_playback(0);
}
if (irq & MCPDM_DN_IRQ) {
dev_dbg(mcpdm_irq->dev, "DN write request\n");
}
if (irq & MCPDM_UP_IRQ_FULL) {
dev_err(mcpdm_irq->dev, "UP FIFO error %x\n", irq_status);
omap_mcpdm_reset_capture(1);
omap_mcpdm_capture_open(mcpdm_irq->uplink);
omap_mcpdm_reset_capture(0);
}
if (irq & MCPDM_UP_IRQ_EMPTY) {
dev_err(mcpdm_irq->dev, "UP FIFO error %x\n", irq_status);
omap_mcpdm_reset_capture(1);
omap_mcpdm_capture_open(mcpdm_irq->uplink);
omap_mcpdm_reset_capture(0);
}
if (irq & MCPDM_UP_IRQ) {
dev_dbg(mcpdm_irq->dev, "UP write request\n");
}
return IRQ_HANDLED;
}
int omap_mcpdm_request(void)
{
int ret;
pm_runtime_get_sync(mcpdm->dev);
spin_lock(&mcpdm->lock);
if (!mcpdm->free) {
dev_err(mcpdm->dev, "McPDM interface is in use\n");
spin_unlock(&mcpdm->lock);
ret = -EBUSY;
goto err;
}
mcpdm->free = 0;
spin_unlock(&mcpdm->lock);
/* Disable lines while request is ongoing */
omap_mcpdm_write(MCPDM_CTRL, 0x00);
ret = request_irq(mcpdm->irq, omap_mcpdm_irq_handler,
0, "McPDM", (void *)mcpdm);
if (ret) {
dev_err(mcpdm->dev, "Request for McPDM IRQ failed\n");
goto err;
}
return 0;
err:
mcpdm->free = 1;
pm_runtime_put_sync(mcpdm->dev);
return ret;
}
void omap_mcpdm_free(void)
{
spin_lock(&mcpdm->lock);
if (mcpdm->free) {
dev_err(mcpdm->dev, "McPDM interface is already free\n");
spin_unlock(&mcpdm->lock);
return;
}
mcpdm->free = 1;
spin_unlock(&mcpdm->lock);
pm_runtime_put_sync(mcpdm->dev);
free_irq(mcpdm->irq, (void *)mcpdm);
}
/* Enable/disable DC offset cancelation for the analog
* headset path (PDM channels 1 and 2).
*/
int omap_mcpdm_set_offset(int offset1, int offset2)
{
int offset;
if ((offset1 > DN_OFST_MAX) || (offset2 > DN_OFST_MAX))
return -EINVAL;
offset = (offset1 << DN_OFST_RX1) | (offset2 << DN_OFST_RX2);
/* offset cancellation for channel 1 */
if (offset1)
offset |= DN_OFST_RX1_EN;
else
offset &= ~DN_OFST_RX1_EN;
/* offset cancellation for channel 2 */
if (offset2)
offset |= DN_OFST_RX2_EN;
else
offset &= ~DN_OFST_RX2_EN;
omap_mcpdm_write(MCPDM_DN_OFFSET, offset);
return 0;
}
int __devinit omap_mcpdm_probe(struct platform_device *pdev)
{
struct resource *res;
int ret = 0;
mcpdm = kzalloc(sizeof(struct omap_mcpdm), GFP_KERNEL);
if (!mcpdm) {
ret = -ENOMEM;
goto exit;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL) {
dev_err(&pdev->dev, "no resource\n");
goto err_resource;
}
spin_lock_init(&mcpdm->lock);
mcpdm->free = 1;
if (!request_mem_region(res->start, resource_size(res), "McPDM")) {
ret = -EBUSY;
goto err_resource;
}
mcpdm->io_base = ioremap(res->start, resource_size(res));
if (!mcpdm->io_base) {
ret = -ENOMEM;
goto err_remap;
}
mcpdm->irq = platform_get_irq(pdev, 0);
mcpdm->dev = &pdev->dev;
platform_set_drvdata(pdev, mcpdm);
pm_runtime_enable(mcpdm->dev);
return 0;
err_remap:
release_mem_region(res->start, resource_size(res));
err_resource:
kfree(mcpdm);
exit:
return ret;
}
int __devexit omap_mcpdm_remove(struct platform_device *pdev)
{
struct omap_mcpdm *mcpdm_ptr = platform_get_drvdata(pdev);
struct resource *res;
platform_set_drvdata(pdev, NULL);
pm_runtime_disable(mcpdm_ptr->dev);
iounmap(mcpdm_ptr->io_base);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(res->start, resource_size(res));
mcpdm_ptr->free = 0;
mcpdm_ptr->dev = NULL;
kfree(mcpdm_ptr);
return 0;
}
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