mirror of https://gitee.com/openkylin/linux.git
538 lines
13 KiB
C
538 lines
13 KiB
C
/*
|
|
* Support for the camera device found on Marvell MMP processors; known
|
|
* to work with the Armada 610 as used in the OLPC 1.75 system.
|
|
*
|
|
* Copyright 2011 Jonathan Corbet <corbet@lwn.net>
|
|
*
|
|
* This file may be distributed under the terms of the GNU General
|
|
* Public License, version 2.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/i2c-gpio.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/videodev2.h>
|
|
#include <media/v4l2-device.h>
|
|
#include <media/mmp-camera.h>
|
|
#include <linux/device.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/gpio.h>
|
|
#include <linux/io.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/list.h>
|
|
#include <linux/pm.h>
|
|
#include <linux/clk.h>
|
|
|
|
#include "mcam-core.h"
|
|
|
|
MODULE_ALIAS("platform:mmp-camera");
|
|
MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static char *mcam_clks[] = {"CCICAXICLK", "CCICFUNCLK", "CCICPHYCLK"};
|
|
|
|
struct mmp_camera {
|
|
void *power_regs;
|
|
struct platform_device *pdev;
|
|
struct mcam_camera mcam;
|
|
struct list_head devlist;
|
|
struct clk *mipi_clk;
|
|
int irq;
|
|
};
|
|
|
|
static inline struct mmp_camera *mcam_to_cam(struct mcam_camera *mcam)
|
|
{
|
|
return container_of(mcam, struct mmp_camera, mcam);
|
|
}
|
|
|
|
/*
|
|
* A silly little infrastructure so we can keep track of our devices.
|
|
* Chances are that we will never have more than one of them, but
|
|
* the Armada 610 *does* have two controllers...
|
|
*/
|
|
|
|
static LIST_HEAD(mmpcam_devices);
|
|
static struct mutex mmpcam_devices_lock;
|
|
|
|
static void mmpcam_add_device(struct mmp_camera *cam)
|
|
{
|
|
mutex_lock(&mmpcam_devices_lock);
|
|
list_add(&cam->devlist, &mmpcam_devices);
|
|
mutex_unlock(&mmpcam_devices_lock);
|
|
}
|
|
|
|
static void mmpcam_remove_device(struct mmp_camera *cam)
|
|
{
|
|
mutex_lock(&mmpcam_devices_lock);
|
|
list_del(&cam->devlist);
|
|
mutex_unlock(&mmpcam_devices_lock);
|
|
}
|
|
|
|
/*
|
|
* Platform dev remove passes us a platform_device, and there's
|
|
* no handy unused drvdata to stash a backpointer in. So just
|
|
* dig it out of our list.
|
|
*/
|
|
static struct mmp_camera *mmpcam_find_device(struct platform_device *pdev)
|
|
{
|
|
struct mmp_camera *cam;
|
|
|
|
mutex_lock(&mmpcam_devices_lock);
|
|
list_for_each_entry(cam, &mmpcam_devices, devlist) {
|
|
if (cam->pdev == pdev) {
|
|
mutex_unlock(&mmpcam_devices_lock);
|
|
return cam;
|
|
}
|
|
}
|
|
mutex_unlock(&mmpcam_devices_lock);
|
|
return NULL;
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
* Power-related registers; this almost certainly belongs
|
|
* somewhere else.
|
|
*
|
|
* ARMADA 610 register manual, sec 7.2.1, p1842.
|
|
*/
|
|
#define CPU_SUBSYS_PMU_BASE 0xd4282800
|
|
#define REG_CCIC_DCGCR 0x28 /* CCIC dyn clock gate ctrl reg */
|
|
#define REG_CCIC_CRCR 0x50 /* CCIC clk reset ctrl reg */
|
|
#define REG_CCIC2_CRCR 0xf4 /* CCIC2 clk reset ctrl reg */
|
|
|
|
static void mcam_clk_enable(struct mcam_camera *mcam)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < NR_MCAM_CLK; i++) {
|
|
if (!IS_ERR(mcam->clk[i]))
|
|
clk_prepare_enable(mcam->clk[i]);
|
|
}
|
|
}
|
|
|
|
static void mcam_clk_disable(struct mcam_camera *mcam)
|
|
{
|
|
int i;
|
|
|
|
for (i = NR_MCAM_CLK - 1; i >= 0; i--) {
|
|
if (!IS_ERR(mcam->clk[i]))
|
|
clk_disable_unprepare(mcam->clk[i]);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Power control.
|
|
*/
|
|
static void mmpcam_power_up_ctlr(struct mmp_camera *cam)
|
|
{
|
|
iowrite32(0x3f, cam->power_regs + REG_CCIC_DCGCR);
|
|
iowrite32(0x3805b, cam->power_regs + REG_CCIC_CRCR);
|
|
mdelay(1);
|
|
}
|
|
|
|
static int mmpcam_power_up(struct mcam_camera *mcam)
|
|
{
|
|
struct mmp_camera *cam = mcam_to_cam(mcam);
|
|
struct mmp_camera_platform_data *pdata;
|
|
|
|
/*
|
|
* Turn on power and clocks to the controller.
|
|
*/
|
|
mmpcam_power_up_ctlr(cam);
|
|
/*
|
|
* Provide power to the sensor.
|
|
*/
|
|
mcam_reg_write(mcam, REG_CLKCTRL, 0x60000002);
|
|
pdata = cam->pdev->dev.platform_data;
|
|
gpio_set_value(pdata->sensor_power_gpio, 1);
|
|
mdelay(5);
|
|
mcam_reg_clear_bit(mcam, REG_CTRL1, 0x10000000);
|
|
gpio_set_value(pdata->sensor_reset_gpio, 0); /* reset is active low */
|
|
mdelay(5);
|
|
gpio_set_value(pdata->sensor_reset_gpio, 1); /* reset is active low */
|
|
mdelay(5);
|
|
|
|
mcam_clk_enable(mcam);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void mmpcam_power_down(struct mcam_camera *mcam)
|
|
{
|
|
struct mmp_camera *cam = mcam_to_cam(mcam);
|
|
struct mmp_camera_platform_data *pdata;
|
|
/*
|
|
* Turn off clocks and set reset lines
|
|
*/
|
|
iowrite32(0, cam->power_regs + REG_CCIC_DCGCR);
|
|
iowrite32(0, cam->power_regs + REG_CCIC_CRCR);
|
|
/*
|
|
* Shut down the sensor.
|
|
*/
|
|
pdata = cam->pdev->dev.platform_data;
|
|
gpio_set_value(pdata->sensor_power_gpio, 0);
|
|
gpio_set_value(pdata->sensor_reset_gpio, 0);
|
|
|
|
mcam_clk_disable(mcam);
|
|
}
|
|
|
|
void mcam_ctlr_reset(struct mcam_camera *mcam)
|
|
{
|
|
unsigned long val;
|
|
struct mmp_camera *cam = mcam_to_cam(mcam);
|
|
|
|
if (mcam->ccic_id) {
|
|
/*
|
|
* Using CCIC2
|
|
*/
|
|
val = ioread32(cam->power_regs + REG_CCIC2_CRCR);
|
|
iowrite32(val & ~0x2, cam->power_regs + REG_CCIC2_CRCR);
|
|
iowrite32(val | 0x2, cam->power_regs + REG_CCIC2_CRCR);
|
|
} else {
|
|
/*
|
|
* Using CCIC1
|
|
*/
|
|
val = ioread32(cam->power_regs + REG_CCIC_CRCR);
|
|
iowrite32(val & ~0x2, cam->power_regs + REG_CCIC_CRCR);
|
|
iowrite32(val | 0x2, cam->power_regs + REG_CCIC_CRCR);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* calc the dphy register values
|
|
* There are three dphy registers being used.
|
|
* dphy[0] - CSI2_DPHY3
|
|
* dphy[1] - CSI2_DPHY5
|
|
* dphy[2] - CSI2_DPHY6
|
|
* CSI2_DPHY3 and CSI2_DPHY6 can be set with a default value
|
|
* or be calculated dynamically
|
|
*/
|
|
void mmpcam_calc_dphy(struct mcam_camera *mcam)
|
|
{
|
|
struct mmp_camera *cam = mcam_to_cam(mcam);
|
|
struct mmp_camera_platform_data *pdata = cam->pdev->dev.platform_data;
|
|
struct device *dev = &cam->pdev->dev;
|
|
unsigned long tx_clk_esc;
|
|
|
|
/*
|
|
* If CSI2_DPHY3 is calculated dynamically,
|
|
* pdata->lane_clk should be already set
|
|
* either in the board driver statically
|
|
* or in the sensor driver dynamically.
|
|
*/
|
|
/*
|
|
* dphy[0] - CSI2_DPHY3:
|
|
* bit 0 ~ bit 7: HS Term Enable.
|
|
* defines the time that the DPHY
|
|
* wait before enabling the data
|
|
* lane termination after detecting
|
|
* that the sensor has driven the data
|
|
* lanes to the LP00 bridge state.
|
|
* The value is calculated by:
|
|
* (Max T(D_TERM_EN)/Period(DDR)) - 1
|
|
* bit 8 ~ bit 15: HS_SETTLE
|
|
* Time interval during which the HS
|
|
* receiver shall ignore any Data Lane
|
|
* HS transistions.
|
|
* The vaule has been calibrated on
|
|
* different boards. It seems to work well.
|
|
*
|
|
* More detail please refer
|
|
* MIPI Alliance Spectification for D-PHY
|
|
* document for explanation of HS-SETTLE
|
|
* and D-TERM-EN.
|
|
*/
|
|
switch (pdata->dphy3_algo) {
|
|
case DPHY3_ALGO_PXA910:
|
|
/*
|
|
* Calculate CSI2_DPHY3 algo for PXA910
|
|
*/
|
|
pdata->dphy[0] =
|
|
(((1 + (pdata->lane_clk * 80) / 1000) & 0xff) << 8)
|
|
| (1 + pdata->lane_clk * 35 / 1000);
|
|
break;
|
|
case DPHY3_ALGO_PXA2128:
|
|
/*
|
|
* Calculate CSI2_DPHY3 algo for PXA2128
|
|
*/
|
|
pdata->dphy[0] =
|
|
(((2 + (pdata->lane_clk * 110) / 1000) & 0xff) << 8)
|
|
| (1 + pdata->lane_clk * 35 / 1000);
|
|
break;
|
|
default:
|
|
/*
|
|
* Use default CSI2_DPHY3 value for PXA688/PXA988
|
|
*/
|
|
dev_dbg(dev, "camera: use the default CSI2_DPHY3 value\n");
|
|
}
|
|
|
|
/*
|
|
* mipi_clk will never be changed, it is a fixed value on MMP
|
|
*/
|
|
if (IS_ERR(cam->mipi_clk))
|
|
return;
|
|
|
|
/* get the escape clk, this is hard coded */
|
|
clk_prepare_enable(cam->mipi_clk);
|
|
tx_clk_esc = (clk_get_rate(cam->mipi_clk) / 1000000) / 12;
|
|
clk_disable_unprepare(cam->mipi_clk);
|
|
/*
|
|
* dphy[2] - CSI2_DPHY6:
|
|
* bit 0 ~ bit 7: CK Term Enable
|
|
* Time for the Clock Lane receiver to enable the HS line
|
|
* termination. The value is calculated similarly with
|
|
* HS Term Enable
|
|
* bit 8 ~ bit 15: CK Settle
|
|
* Time interval during which the HS receiver shall ignore
|
|
* any Clock Lane HS transitions.
|
|
* The value is calibrated on the boards.
|
|
*/
|
|
pdata->dphy[2] =
|
|
((((534 * tx_clk_esc) / 2000 - 1) & 0xff) << 8)
|
|
| (((38 * tx_clk_esc) / 1000 - 1) & 0xff);
|
|
|
|
dev_dbg(dev, "camera: DPHY sets: dphy3=0x%x, dphy5=0x%x, dphy6=0x%x\n",
|
|
pdata->dphy[0], pdata->dphy[1], pdata->dphy[2]);
|
|
}
|
|
|
|
static irqreturn_t mmpcam_irq(int irq, void *data)
|
|
{
|
|
struct mcam_camera *mcam = data;
|
|
unsigned int irqs, handled;
|
|
|
|
spin_lock(&mcam->dev_lock);
|
|
irqs = mcam_reg_read(mcam, REG_IRQSTAT);
|
|
handled = mccic_irq(mcam, irqs);
|
|
spin_unlock(&mcam->dev_lock);
|
|
return IRQ_RETVAL(handled);
|
|
}
|
|
|
|
static void mcam_init_clk(struct mcam_camera *mcam)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < NR_MCAM_CLK; i++) {
|
|
if (mcam_clks[i] != NULL) {
|
|
/* Some clks are not necessary on some boards
|
|
* We still try to run even it fails getting clk
|
|
*/
|
|
mcam->clk[i] = devm_clk_get(mcam->dev, mcam_clks[i]);
|
|
if (IS_ERR(mcam->clk[i]))
|
|
dev_warn(mcam->dev, "Could not get clk: %s\n",
|
|
mcam_clks[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int mmpcam_probe(struct platform_device *pdev)
|
|
{
|
|
struct mmp_camera *cam;
|
|
struct mcam_camera *mcam;
|
|
struct resource *res;
|
|
struct mmp_camera_platform_data *pdata;
|
|
int ret;
|
|
|
|
pdata = pdev->dev.platform_data;
|
|
if (!pdata)
|
|
return -ENODEV;
|
|
|
|
cam = devm_kzalloc(&pdev->dev, sizeof(*cam), GFP_KERNEL);
|
|
if (cam == NULL)
|
|
return -ENOMEM;
|
|
cam->pdev = pdev;
|
|
INIT_LIST_HEAD(&cam->devlist);
|
|
|
|
mcam = &cam->mcam;
|
|
mcam->plat_power_up = mmpcam_power_up;
|
|
mcam->plat_power_down = mmpcam_power_down;
|
|
mcam->ctlr_reset = mcam_ctlr_reset;
|
|
mcam->calc_dphy = mmpcam_calc_dphy;
|
|
mcam->dev = &pdev->dev;
|
|
mcam->use_smbus = 0;
|
|
mcam->ccic_id = pdev->id;
|
|
mcam->mclk_min = pdata->mclk_min;
|
|
mcam->mclk_src = pdata->mclk_src;
|
|
mcam->mclk_div = pdata->mclk_div;
|
|
mcam->bus_type = pdata->bus_type;
|
|
mcam->dphy = pdata->dphy;
|
|
if (mcam->bus_type == V4L2_MBUS_CSI2) {
|
|
cam->mipi_clk = devm_clk_get(mcam->dev, "mipi");
|
|
if ((IS_ERR(cam->mipi_clk) && mcam->dphy[2] == 0))
|
|
return PTR_ERR(cam->mipi_clk);
|
|
}
|
|
mcam->mipi_enabled = false;
|
|
mcam->lane = pdata->lane;
|
|
mcam->chip_id = MCAM_ARMADA610;
|
|
mcam->buffer_mode = B_DMA_sg;
|
|
spin_lock_init(&mcam->dev_lock);
|
|
/*
|
|
* Get our I/O memory.
|
|
*/
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
mcam->regs = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(mcam->regs))
|
|
return PTR_ERR(mcam->regs);
|
|
mcam->regs_size = resource_size(res);
|
|
/*
|
|
* Power/clock memory is elsewhere; get it too. Perhaps this
|
|
* should really be managed outside of this driver?
|
|
*/
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
|
cam->power_regs = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(cam->power_regs))
|
|
return PTR_ERR(cam->power_regs);
|
|
/*
|
|
* Find the i2c adapter. This assumes, of course, that the
|
|
* i2c bus is already up and functioning.
|
|
*/
|
|
mcam->i2c_adapter = platform_get_drvdata(pdata->i2c_device);
|
|
if (mcam->i2c_adapter == NULL) {
|
|
dev_err(&pdev->dev, "No i2c adapter\n");
|
|
return -ENODEV;
|
|
}
|
|
/*
|
|
* Sensor GPIO pins.
|
|
*/
|
|
ret = devm_gpio_request(&pdev->dev, pdata->sensor_power_gpio,
|
|
"cam-power");
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Can't get sensor power gpio %d",
|
|
pdata->sensor_power_gpio);
|
|
return ret;
|
|
}
|
|
gpio_direction_output(pdata->sensor_power_gpio, 0);
|
|
ret = devm_gpio_request(&pdev->dev, pdata->sensor_reset_gpio,
|
|
"cam-reset");
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Can't get sensor reset gpio %d",
|
|
pdata->sensor_reset_gpio);
|
|
return ret;
|
|
}
|
|
gpio_direction_output(pdata->sensor_reset_gpio, 0);
|
|
|
|
mcam_init_clk(mcam);
|
|
|
|
/*
|
|
* Power the device up and hand it off to the core.
|
|
*/
|
|
ret = mmpcam_power_up(mcam);
|
|
if (ret)
|
|
return ret;
|
|
ret = mccic_register(mcam);
|
|
if (ret)
|
|
goto out_power_down;
|
|
/*
|
|
* Finally, set up our IRQ now that the core is ready to
|
|
* deal with it.
|
|
*/
|
|
res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
|
|
if (res == NULL) {
|
|
ret = -ENODEV;
|
|
goto out_unregister;
|
|
}
|
|
cam->irq = res->start;
|
|
ret = devm_request_irq(&pdev->dev, cam->irq, mmpcam_irq, IRQF_SHARED,
|
|
"mmp-camera", mcam);
|
|
if (ret == 0) {
|
|
mmpcam_add_device(cam);
|
|
return 0;
|
|
}
|
|
|
|
out_unregister:
|
|
mccic_shutdown(mcam);
|
|
out_power_down:
|
|
mmpcam_power_down(mcam);
|
|
return ret;
|
|
}
|
|
|
|
|
|
static int mmpcam_remove(struct mmp_camera *cam)
|
|
{
|
|
struct mcam_camera *mcam = &cam->mcam;
|
|
|
|
mmpcam_remove_device(cam);
|
|
mccic_shutdown(mcam);
|
|
mmpcam_power_down(mcam);
|
|
return 0;
|
|
}
|
|
|
|
static int mmpcam_platform_remove(struct platform_device *pdev)
|
|
{
|
|
struct mmp_camera *cam = mmpcam_find_device(pdev);
|
|
|
|
if (cam == NULL)
|
|
return -ENODEV;
|
|
return mmpcam_remove(cam);
|
|
}
|
|
|
|
/*
|
|
* Suspend/resume support.
|
|
*/
|
|
#ifdef CONFIG_PM
|
|
|
|
static int mmpcam_suspend(struct platform_device *pdev, pm_message_t state)
|
|
{
|
|
struct mmp_camera *cam = mmpcam_find_device(pdev);
|
|
|
|
if (state.event != PM_EVENT_SUSPEND)
|
|
return 0;
|
|
mccic_suspend(&cam->mcam);
|
|
return 0;
|
|
}
|
|
|
|
static int mmpcam_resume(struct platform_device *pdev)
|
|
{
|
|
struct mmp_camera *cam = mmpcam_find_device(pdev);
|
|
|
|
/*
|
|
* Power up unconditionally just in case the core tries to
|
|
* touch a register even if nothing was active before; trust
|
|
* me, it's better this way.
|
|
*/
|
|
mmpcam_power_up_ctlr(cam);
|
|
return mccic_resume(&cam->mcam);
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
static struct platform_driver mmpcam_driver = {
|
|
.probe = mmpcam_probe,
|
|
.remove = mmpcam_platform_remove,
|
|
#ifdef CONFIG_PM
|
|
.suspend = mmpcam_suspend,
|
|
.resume = mmpcam_resume,
|
|
#endif
|
|
.driver = {
|
|
.name = "mmp-camera",
|
|
.owner = THIS_MODULE
|
|
}
|
|
};
|
|
|
|
|
|
static int __init mmpcam_init_module(void)
|
|
{
|
|
mutex_init(&mmpcam_devices_lock);
|
|
return platform_driver_register(&mmpcam_driver);
|
|
}
|
|
|
|
static void __exit mmpcam_exit_module(void)
|
|
{
|
|
platform_driver_unregister(&mmpcam_driver);
|
|
/*
|
|
* platform_driver_unregister() should have emptied the list
|
|
*/
|
|
if (!list_empty(&mmpcam_devices))
|
|
printk(KERN_ERR "mmp_camera leaving devices behind\n");
|
|
}
|
|
|
|
module_init(mmpcam_init_module);
|
|
module_exit(mmpcam_exit_module);
|