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9967232f1b
One of the OLPC changes lost a little in its translation to mainline, leading to build errors on the ARM architecture. Remove the offending line, and all will be well. Reported-by: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: stable@vger.kernel.org Signed-off-by: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
380 lines
8.9 KiB
C
380 lines
8.9 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/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 <media/v4l2-chip-ident.h>
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#include <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 "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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struct mmp_camera {
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void *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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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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/*
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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 void 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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}
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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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}
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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 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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cam = kzalloc(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->dev = &pdev->dev;
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mcam->use_smbus = 0;
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mcam->chip_id = V4L2_IDENT_ARMADA610;
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mcam->buffer_mode = B_DMA_sg;
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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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if (res == NULL) {
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dev_err(&pdev->dev, "no iomem resource!\n");
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ret = -ENODEV;
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goto out_free;
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}
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mcam->regs = ioremap(res->start, resource_size(res));
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if (mcam->regs == NULL) {
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dev_err(&pdev->dev, "MMIO ioremap fail\n");
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ret = -ENODEV;
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goto out_free;
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}
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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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if (res == NULL) {
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dev_err(&pdev->dev, "no power resource!\n");
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ret = -ENODEV;
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goto out_unmap1;
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}
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cam->power_regs = ioremap(res->start, resource_size(res));
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if (cam->power_regs == NULL) {
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dev_err(&pdev->dev, "power MMIO ioremap fail\n");
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ret = -ENODEV;
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goto out_unmap1;
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}
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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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pdata = pdev->dev.platform_data;
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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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ret = -ENODEV;
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dev_err(&pdev->dev, "No i2c adapter\n");
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goto out_unmap2;
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}
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/*
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* Sensor GPIO pins.
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*/
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ret = gpio_request(pdata->sensor_power_gpio, "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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goto out_unmap2;
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}
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gpio_direction_output(pdata->sensor_power_gpio, 0);
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ret = gpio_request(pdata->sensor_reset_gpio, "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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goto out_gpio;
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}
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gpio_direction_output(pdata->sensor_reset_gpio, 0);
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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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mmpcam_power_up(mcam);
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ret = mccic_register(mcam);
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if (ret)
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goto out_gpio2;
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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 = request_irq(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_gpio2:
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mmpcam_power_down(mcam);
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gpio_free(pdata->sensor_reset_gpio);
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out_gpio:
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gpio_free(pdata->sensor_power_gpio);
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out_unmap2:
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iounmap(cam->power_regs);
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out_unmap1:
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iounmap(mcam->regs);
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out_free:
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kfree(cam);
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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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struct mmp_camera_platform_data *pdata;
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mmpcam_remove_device(cam);
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free_irq(cam->irq, mcam);
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mccic_shutdown(mcam);
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mmpcam_power_down(mcam);
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pdata = cam->pdev->dev.platform_data;
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gpio_free(pdata->sensor_reset_gpio);
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gpio_free(pdata->sensor_power_gpio);
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iounmap(cam->power_regs);
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iounmap(mcam->regs);
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kfree(cam);
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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
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* touch a register even if nothing was active before; trust
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* me, it's better this way.
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*/
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mmpcam_power_up_ctlr(cam);
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return mccic_resume(&cam->mcam);
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}
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#endif
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static struct platform_driver mmpcam_driver = {
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.probe = mmpcam_probe,
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.remove = mmpcam_platform_remove,
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#ifdef CONFIG_PM
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.suspend = mmpcam_suspend,
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.resume = mmpcam_resume,
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#endif
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.driver = {
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.name = "mmp-camera",
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.owner = THIS_MODULE
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}
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};
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static int __init mmpcam_init_module(void)
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{
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mutex_init(&mmpcam_devices_lock);
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return platform_driver_register(&mmpcam_driver);
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}
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static void __exit mmpcam_exit_module(void)
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{
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platform_driver_unregister(&mmpcam_driver);
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/*
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* platform_driver_unregister() should have emptied the list
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*/
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if (!list_empty(&mmpcam_devices))
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printk(KERN_ERR "mmp_camera leaving devices behind\n");
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}
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module_init(mmpcam_init_module);
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module_exit(mmpcam_exit_module);
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