- 根目录:
- drivers
- media
- platform
- s5p-tv
- sdo_drv.c
/*
* Samsung Standard Definition Output (SDO) driver
*
* Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
*
* Tomasz Stanislawski, <t.stanislaws@samsung.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundiation. either version 2 of the License,
* or (at your option) any later version
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <media/v4l2-subdev.h>
#include "regs-sdo.h"
MODULE_AUTHOR("Tomasz Stanislawski, <t.stanislaws@samsung.com>");
MODULE_DESCRIPTION("Samsung Standard Definition Output (SDO)");
MODULE_LICENSE("GPL");
#define SDO_DEFAULT_STD V4L2_STD_PAL
struct sdo_format {
v4l2_std_id id;
/* all modes are 720 pixels wide */
unsigned int height;
unsigned int cookie;
};
struct sdo_device {
/** pointer to device parent */
struct device *dev;
/** base address of SDO registers */
void __iomem *regs;
/** SDO interrupt */
unsigned int irq;
/** DAC source clock */
struct clk *sclk_dac;
/** DAC clock */
struct clk *dac;
/** DAC physical interface */
struct clk *dacphy;
/** clock for control of VPLL */
struct clk *fout_vpll;
/** vpll rate before sdo stream was on */
unsigned long vpll_rate;
/** regulator for SDO IP power */
struct regulator *vdac;
/** regulator for SDO plug detection */
struct regulator *vdet;
/** subdev used as device interface */
struct v4l2_subdev sd;
/** current format */
const struct sdo_format *fmt;
};
static inline struct sdo_device *sd_to_sdev(struct v4l2_subdev *sd)
{
return container_of(sd, struct sdo_device, sd);
}
static inline
void sdo_write_mask(struct sdo_device *sdev, u32 reg_id, u32 value, u32 mask)
{
u32 old = readl(sdev->regs + reg_id);
value = (value & mask) | (old & ~mask);
writel(value, sdev->regs + reg_id);
}
static inline
void sdo_write(struct sdo_device *sdev, u32 reg_id, u32 value)
{
writel(value, sdev->regs + reg_id);
}
static inline
u32 sdo_read(struct sdo_device *sdev, u32 reg_id)
{
return readl(sdev->regs + reg_id);
}
static irqreturn_t sdo_irq_handler(int irq, void *dev_data)
{
struct sdo_device *sdev = dev_data;
/* clear interrupt */
sdo_write_mask(sdev, SDO_IRQ, ~0, SDO_VSYNC_IRQ_PEND);
return IRQ_HANDLED;
}
static void sdo_reg_debug(struct sdo_device *sdev)
{
#define DBGREG(reg_id) \
dev_info(sdev->dev, #reg_id " = %08x\n", \
sdo_read(sdev, reg_id))
DBGREG(SDO_CLKCON);
DBGREG(SDO_CONFIG);
DBGREG(SDO_VBI);
DBGREG(SDO_DAC);
DBGREG(SDO_IRQ);
DBGREG(SDO_IRQMASK);
DBGREG(SDO_VERSION);
}
static const struct sdo_format sdo_format[] = {
{ V4L2_STD_PAL_N, .height = 576, .cookie = SDO_PAL_N },
{ V4L2_STD_PAL_Nc, .height = 576, .cookie = SDO_PAL_NC },
{ V4L2_STD_PAL_M, .height = 480, .cookie = SDO_PAL_M },
{ V4L2_STD_PAL_60, .height = 480, .cookie = SDO_PAL_60 },
{ V4L2_STD_NTSC_443, .height = 480, .cookie = SDO_NTSC_443 },
{ V4L2_STD_PAL, .height = 576, .cookie = SDO_PAL_BGHID },
{ V4L2_STD_NTSC_M, .height = 480, .cookie = SDO_NTSC_M },
};
static const struct sdo_format *sdo_find_format(v4l2_std_id id)
{
int i;
for (i = 0; i < ARRAY_SIZE(sdo_format); ++i)
if (sdo_format[i].id & id)
return &sdo_format[i];
return NULL;
}
static int sdo_g_tvnorms_output(struct v4l2_subdev *sd, v4l2_std_id *std)
{
*std = V4L2_STD_NTSC_M | V4L2_STD_PAL_M | V4L2_STD_PAL |
V4L2_STD_PAL_N | V4L2_STD_PAL_Nc |
V4L2_STD_NTSC_443 | V4L2_STD_PAL_60;
return 0;
}
static int sdo_s_std_output(struct v4l2_subdev *sd, v4l2_std_id std)
{
struct sdo_device *sdev = sd_to_sdev(sd);
const struct sdo_format *fmt;
fmt = sdo_find_format(std);
if (fmt == NULL)
return -EINVAL;
sdev->fmt = fmt;
return 0;
}
static int sdo_g_std_output(struct v4l2_subdev *sd, v4l2_std_id *std)
{
*std = sd_to_sdev(sd)->fmt->id;
return 0;
}
static int sdo_get_fmt(struct v4l2_subdev *sd,
struct v4l2_subdev_pad_config *cfg,
struct v4l2_subdev_format *format)
{
struct v4l2_mbus_framefmt *fmt = &format->format;
struct sdo_device *sdev = sd_to_sdev(sd);
if (!sdev->fmt)
return -ENXIO;
if (format->pad)
return -EINVAL;
/* all modes are 720 pixels wide */
fmt->width = 720;
fmt->height = sdev->fmt->height;
fmt->code = MEDIA_BUS_FMT_FIXED;
fmt->field = V4L2_FIELD_INTERLACED;
fmt->colorspace = V4L2_COLORSPACE_JPEG;
return 0;
}
static int sdo_s_power(struct v4l2_subdev *sd, int on)
{
struct sdo_device *sdev = sd_to_sdev(sd);
struct device *dev = sdev->dev;
int ret;
dev_info(dev, "sdo_s_power(%d)\n", on);
if (on)
ret = pm_runtime_get_sync(dev);
else
ret = pm_runtime_put_sync(dev);
/* only values < 0 indicate errors */
return ret < 0 ? ret : 0;
}
static int sdo_streamon(struct sdo_device *sdev)
{
int ret;
/* set proper clock for Timing Generator */
sdev->vpll_rate = clk_get_rate(sdev->fout_vpll);
ret = clk_set_rate(sdev->fout_vpll, 54000000);
if (ret < 0) {
dev_err(sdev->dev, "Failed to set vpll rate\n");
return ret;
}
dev_info(sdev->dev, "fout_vpll.rate = %lu\n",
clk_get_rate(sdev->fout_vpll));
/* enable clock in SDO */
sdo_write_mask(sdev, SDO_CLKCON, ~0, SDO_TVOUT_CLOCK_ON);
ret = clk_prepare_enable(sdev->dacphy);
if (ret < 0) {
dev_err(sdev->dev, "clk_prepare_enable(dacphy) failed\n");
goto fail;
}
/* enable DAC */
sdo_write_mask(sdev, SDO_DAC, ~0, SDO_POWER_ON_DAC);
sdo_reg_debug(sdev);
return 0;
fail:
sdo_write_mask(sdev, SDO_CLKCON, 0, SDO_TVOUT_CLOCK_ON);
clk_set_rate(sdev->fout_vpll, sdev->vpll_rate);
return ret;
}
static int sdo_streamoff(struct sdo_device *sdev)
{
int tries;
sdo_write_mask(sdev, SDO_DAC, 0, SDO_POWER_ON_DAC);
clk_disable_unprepare(sdev->dacphy);
sdo_write_mask(sdev, SDO_CLKCON, 0, SDO_TVOUT_CLOCK_ON);
for (tries = 100; tries; --tries) {
if (sdo_read(sdev, SDO_CLKCON) & SDO_TVOUT_CLOCK_READY)
break;
mdelay(1);
}
if (tries == 0)
dev_err(sdev->dev, "failed to stop streaming\n");
clk_set_rate(sdev->fout_vpll, sdev->vpll_rate);
return tries ? 0 : -EIO;
}
static int sdo_s_stream(struct v4l2_subdev *sd, int on)
{
struct sdo_device *sdev = sd_to_sdev(sd);
return on ? sdo_streamon(sdev) : sdo_streamoff(sdev);
}
static const struct v4l2_subdev_core_ops sdo_sd_core_ops = {
.s_power = sdo_s_power,
};
static const struct v4l2_subdev_video_ops sdo_sd_video_ops = {
.s_std_output = sdo_s_std_output,
.g_std_output = sdo_g_std_output,
.g_tvnorms_output = sdo_g_tvnorms_output,
.s_stream = sdo_s_stream,
};
static const struct v4l2_subdev_pad_ops sdo_sd_pad_ops = {
.get_fmt = sdo_get_fmt,
};
static const struct v4l2_subdev_ops sdo_sd_ops = {
.core = &sdo_sd_core_ops,
.video = &sdo_sd_video_ops,
.pad = &sdo_sd_pad_ops,
};
static int sdo_runtime_suspend(struct device *dev)
{
struct v4l2_subdev *sd = dev_get_drvdata(dev);
struct sdo_device *sdev = sd_to_sdev(sd);
dev_info(dev, "suspend\n");
regulator_disable(sdev->vdet);
regulator_disable(sdev->vdac);
clk_disable_unprepare(sdev->sclk_dac);
return 0;
}
static int sdo_runtime_resume(struct device *dev)
{
struct v4l2_subdev *sd = dev_get_drvdata(dev);
struct sdo_device *sdev = sd_to_sdev(sd);
int ret;
dev_info(dev, "resume\n");
ret = clk_prepare_enable(sdev->sclk_dac);
if (ret < 0)
return ret;
ret = regulator_enable(sdev->vdac);
if (ret < 0)
goto dac_clk_dis;
ret = regulator_enable(sdev->vdet);
if (ret < 0)
goto vdac_r_dis;
/* software reset */
sdo_write_mask(sdev, SDO_CLKCON, ~0, SDO_TVOUT_SW_RESET);
mdelay(10);
sdo_write_mask(sdev, SDO_CLKCON, 0, SDO_TVOUT_SW_RESET);
/* setting TV mode */
sdo_write_mask(sdev, SDO_CONFIG, sdev->fmt->cookie, SDO_STANDARD_MASK);
/* XXX: forcing interlaced mode using undocumented bit */
sdo_write_mask(sdev, SDO_CONFIG, 0, SDO_PROGRESSIVE);
/* turn all VBI off */
sdo_write_mask(sdev, SDO_VBI, 0, SDO_CVBS_WSS_INS |
SDO_CVBS_CLOSED_CAPTION_MASK);
/* turn all post processing off */
sdo_write_mask(sdev, SDO_CCCON, ~0, SDO_COMPENSATION_BHS_ADJ_OFF |
SDO_COMPENSATION_CVBS_COMP_OFF);
sdo_reg_debug(sdev);
return 0;
vdac_r_dis:
regulator_disable(sdev->vdac);
dac_clk_dis:
clk_disable_unprepare(sdev->sclk_dac);
return ret;
}
static const struct dev_pm_ops sdo_pm_ops = {
.runtime_suspend = sdo_runtime_suspend,
.runtime_resume = sdo_runtime_resume,
};
static int sdo_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct sdo_device *sdev;
struct resource *res;
int ret = 0;
struct clk *sclk_vpll;
dev_info(dev, "probe start\n");
sdev = devm_kzalloc(&pdev->dev, sizeof(*sdev), GFP_KERNEL);
if (!sdev) {
dev_err(dev, "not enough memory.\n");
ret = -ENOMEM;
goto fail;
}
sdev->dev = dev;
/* mapping registers */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL) {
dev_err(dev, "get memory resource failed.\n");
ret = -ENXIO;
goto fail;
}
sdev->regs = devm_ioremap(&pdev->dev, res->start, resource_size(res));
if (sdev->regs == NULL) {
dev_err(dev, "register mapping failed.\n");
ret = -ENXIO;
goto fail;
}
/* acquiring interrupt */
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (res == NULL) {
dev_err(dev, "get interrupt resource failed.\n");
ret = -ENXIO;
goto fail;
}
ret = devm_request_irq(&pdev->dev, res->start, sdo_irq_handler, 0,
"s5p-sdo", sdev);
if (ret) {
dev_err(dev, "request interrupt failed.\n");
goto fail;
}
sdev->irq = res->start;
/* acquire clocks */
sdev->sclk_dac = clk_get(dev, "sclk_dac");
if (IS_ERR(sdev->sclk_dac)) {
dev_err(dev, "failed to get clock 'sclk_dac'\n");
ret = PTR_ERR(sdev->sclk_dac);
goto fail;
}
sdev->dac = clk_get(dev, "dac");
if (IS_ERR(sdev->dac)) {
dev_err(dev, "failed to get clock 'dac'\n");
ret = PTR_ERR(sdev->dac);
goto fail_sclk_dac;
}
sdev->dacphy = clk_get(dev, "dacphy");
if (IS_ERR(sdev->dacphy)) {
dev_err(dev, "failed to get clock 'dacphy'\n");
ret = PTR_ERR(sdev->dacphy);
goto fail_dac;
}
sclk_vpll = clk_get(dev, "sclk_vpll");
if (IS_ERR(sclk_vpll)) {
dev_err(dev, "failed to get clock 'sclk_vpll'\n");
ret = PTR_ERR(sclk_vpll);
goto fail_dacphy;
}
clk_set_parent(sdev->sclk_dac, sclk_vpll);
clk_put(sclk_vpll);
sdev->fout_vpll = clk_get(dev, "fout_vpll");
if (IS_ERR(sdev->fout_vpll)) {
dev_err(dev, "failed to get clock 'fout_vpll'\n");
ret = PTR_ERR(sdev->fout_vpll);
goto fail_dacphy;
}
dev_info(dev, "fout_vpll.rate = %lu\n", clk_get_rate(sclk_vpll));
/* acquire regulator */
sdev->vdac = devm_regulator_get(dev, "vdd33a_dac");
if (IS_ERR(sdev->vdac)) {
dev_err(dev, "failed to get regulator 'vdac'\n");
ret = PTR_ERR(sdev->vdac);
goto fail_fout_vpll;
}
sdev->vdet = devm_regulator_get(dev, "vdet");
if (IS_ERR(sdev->vdet)) {
dev_err(dev, "failed to get regulator 'vdet'\n");
ret = PTR_ERR(sdev->vdet);
goto fail_fout_vpll;
}
/* enable gate for dac clock, because mixer uses it */
ret = clk_prepare_enable(sdev->dac);
if (ret < 0) {
dev_err(dev, "clk_prepare_enable(dac) failed\n");
goto fail_fout_vpll;
}
/* configure power management */
pm_runtime_enable(dev);
/* configuration of interface subdevice */
v4l2_subdev_init(&sdev->sd, &sdo_sd_ops);
sdev->sd.owner = THIS_MODULE;
strlcpy(sdev->sd.name, "s5p-sdo", sizeof(sdev->sd.name));
/* set default format */
sdev->fmt = sdo_find_format(SDO_DEFAULT_STD);
BUG_ON(sdev->fmt == NULL);
/* keeping subdev in device's private for use by other drivers */
dev_set_drvdata(dev, &sdev->sd);
dev_info(dev, "probe succeeded\n");
return 0;
fail_fout_vpll:
clk_put(sdev->fout_vpll);
fail_dacphy:
clk_put(sdev->dacphy);
fail_dac:
clk_put(sdev->dac);
fail_sclk_dac:
clk_put(sdev->sclk_dac);
fail:
dev_info(dev, "probe failed\n");
return ret;
}
static int sdo_remove(struct platform_device *pdev)
{
struct v4l2_subdev *sd = dev_get_drvdata(&pdev->dev);
struct sdo_device *sdev = sd_to_sdev(sd);
pm_runtime_disable(&pdev->dev);
clk_disable_unprepare(sdev->dac);
clk_put(sdev->fout_vpll);
clk_put(sdev->dacphy);
clk_put(sdev->dac);
clk_put(sdev->sclk_dac);
dev_info(&pdev->dev, "remove successful\n");
return 0;
}
static struct platform_driver sdo_driver __refdata = {
.probe = sdo_probe,
.remove = sdo_remove,
.driver = {
.name = "s5p-sdo",
.pm = &sdo_pm_ops,
}
};
module_platform_driver(sdo_driver);