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