diff options
Diffstat (limited to 'drivers/media/video/marvell-ccic/cafe-driver.c')
| -rw-r--r-- | drivers/media/video/marvell-ccic/cafe-driver.c | 654 |
1 files changed, 0 insertions, 654 deletions
diff --git a/drivers/media/video/marvell-ccic/cafe-driver.c b/drivers/media/video/marvell-ccic/cafe-driver.c deleted file mode 100644 index d030f9beae8..00000000000 --- a/drivers/media/video/marvell-ccic/cafe-driver.c +++ /dev/null @@ -1,654 +0,0 @@ -/* - * A driver for the CMOS camera controller in the Marvell 88ALP01 "cafe" - * multifunction chip. Currently works with the Omnivision OV7670 - * sensor. - * - * The data sheet for this device can be found at: - * http://www.marvell.com/products/pc_connectivity/88alp01/ - * - * Copyright 2006-11 One Laptop Per Child Association, Inc. - * Copyright 2006-11 Jonathan Corbet <corbet@lwn.net> - * - * Written by Jonathan Corbet, corbet@lwn.net. - * - * v4l2_device/v4l2_subdev conversion by: - * Copyright (C) 2009 Hans Verkuil <hverkuil@xs4all.nl> - * - * This file may be distributed under the terms of the GNU General - * Public License, version 2. - */ -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/init.h> -#include <linux/pci.h> -#include <linux/i2c.h> -#include <linux/interrupt.h> -#include <linux/spinlock.h> -#include <linux/slab.h> -#include <linux/videodev2.h> -#include <media/v4l2-device.h> -#include <media/v4l2-chip-ident.h> -#include <linux/device.h> -#include <linux/wait.h> -#include <linux/delay.h> -#include <linux/io.h> - -#include "mcam-core.h" - -#define CAFE_VERSION 0x000002 - - -/* - * Parameters. - */ -MODULE_AUTHOR("Jonathan Corbet <corbet@lwn.net>"); -MODULE_DESCRIPTION("Marvell 88ALP01 CMOS Camera Controller driver"); -MODULE_LICENSE("GPL"); -MODULE_SUPPORTED_DEVICE("Video"); - - - - -struct cafe_camera { - int registered; /* Fully initialized? */ - struct mcam_camera mcam; - struct pci_dev *pdev; - wait_queue_head_t smbus_wait; /* Waiting on i2c events */ -}; - -/* - * Most of the camera controller registers are defined in mcam-core.h, - * but the Cafe platform has some additional registers of its own; - * they are described here. - */ - -/* - * "General purpose register" has a couple of GPIOs used for sensor - * power and reset on OLPC XO 1.0 systems. - */ -#define REG_GPR 0xb4 -#define GPR_C1EN 0x00000020 /* Pad 1 (power down) enable */ -#define GPR_C0EN 0x00000010 /* Pad 0 (reset) enable */ -#define GPR_C1 0x00000002 /* Control 1 value */ -/* - * Control 0 is wired to reset on OLPC machines. For ov7x sensors, - * it is active low. - */ -#define GPR_C0 0x00000001 /* Control 0 value */ - -/* - * These registers control the SMBUS module for communicating - * with the sensor. - */ -#define REG_TWSIC0 0xb8 /* TWSI (smbus) control 0 */ -#define TWSIC0_EN 0x00000001 /* TWSI enable */ -#define TWSIC0_MODE 0x00000002 /* 1 = 16-bit, 0 = 8-bit */ -#define TWSIC0_SID 0x000003fc /* Slave ID */ -/* - * Subtle trickery: the slave ID field starts with bit 2. But the - * Linux i2c stack wants to treat the bottommost bit as a separate - * read/write bit, which is why slave ID's are usually presented - * >>1. For consistency with that behavior, we shift over three - * bits instead of two. - */ -#define TWSIC0_SID_SHIFT 3 -#define TWSIC0_CLKDIV 0x0007fc00 /* Clock divider */ -#define TWSIC0_MASKACK 0x00400000 /* Mask ack from sensor */ -#define TWSIC0_OVMAGIC 0x00800000 /* Make it work on OV sensors */ - -#define REG_TWSIC1 0xbc /* TWSI control 1 */ -#define TWSIC1_DATA 0x0000ffff /* Data to/from camchip */ -#define TWSIC1_ADDR 0x00ff0000 /* Address (register) */ -#define TWSIC1_ADDR_SHIFT 16 -#define TWSIC1_READ 0x01000000 /* Set for read op */ -#define TWSIC1_WSTAT 0x02000000 /* Write status */ -#define TWSIC1_RVALID 0x04000000 /* Read data valid */ -#define TWSIC1_ERROR 0x08000000 /* Something screwed up */ - -/* - * Here's the weird global control registers - */ -#define REG_GL_CSR 0x3004 /* Control/status register */ -#define GCSR_SRS 0x00000001 /* SW Reset set */ -#define GCSR_SRC 0x00000002 /* SW Reset clear */ -#define GCSR_MRS 0x00000004 /* Master reset set */ -#define GCSR_MRC 0x00000008 /* HW Reset clear */ -#define GCSR_CCIC_EN 0x00004000 /* CCIC Clock enable */ -#define REG_GL_IMASK 0x300c /* Interrupt mask register */ -#define GIMSK_CCIC_EN 0x00000004 /* CCIC Interrupt enable */ - -#define REG_GL_FCR 0x3038 /* GPIO functional control register */ -#define GFCR_GPIO_ON 0x08 /* Camera GPIO enabled */ -#define REG_GL_GPIOR 0x315c /* GPIO register */ -#define GGPIO_OUT 0x80000 /* GPIO output */ -#define GGPIO_VAL 0x00008 /* Output pin value */ - -#define REG_LEN (REG_GL_IMASK + 4) - - -/* - * Debugging and related. - */ -#define cam_err(cam, fmt, arg...) \ - dev_err(&(cam)->pdev->dev, fmt, ##arg); -#define cam_warn(cam, fmt, arg...) \ - dev_warn(&(cam)->pdev->dev, fmt, ##arg); - -/* -------------------------------------------------------------------- */ -/* - * The I2C/SMBUS interface to the camera itself starts here. The - * controller handles SMBUS itself, presenting a relatively simple register - * interface; all we have to do is to tell it where to route the data. - */ -#define CAFE_SMBUS_TIMEOUT (HZ) /* generous */ - -static inline struct cafe_camera *to_cam(struct v4l2_device *dev) -{ - struct mcam_camera *m = container_of(dev, struct mcam_camera, v4l2_dev); - return container_of(m, struct cafe_camera, mcam); -} - - -static int cafe_smbus_write_done(struct mcam_camera *mcam) -{ - unsigned long flags; - int c1; - - /* - * We must delay after the interrupt, or the controller gets confused - * and never does give us good status. Fortunately, we don't do this - * often. - */ - udelay(20); - spin_lock_irqsave(&mcam->dev_lock, flags); - c1 = mcam_reg_read(mcam, REG_TWSIC1); - spin_unlock_irqrestore(&mcam->dev_lock, flags); - return (c1 & (TWSIC1_WSTAT|TWSIC1_ERROR)) != TWSIC1_WSTAT; -} - -static int cafe_smbus_write_data(struct cafe_camera *cam, - u16 addr, u8 command, u8 value) -{ - unsigned int rval; - unsigned long flags; - struct mcam_camera *mcam = &cam->mcam; - - spin_lock_irqsave(&mcam->dev_lock, flags); - rval = TWSIC0_EN | ((addr << TWSIC0_SID_SHIFT) & TWSIC0_SID); - rval |= TWSIC0_OVMAGIC; /* Make OV sensors work */ - /* - * Marvell sez set clkdiv to all 1's for now. - */ - rval |= TWSIC0_CLKDIV; - mcam_reg_write(mcam, REG_TWSIC0, rval); - (void) mcam_reg_read(mcam, REG_TWSIC1); /* force write */ - rval = value | ((command << TWSIC1_ADDR_SHIFT) & TWSIC1_ADDR); - mcam_reg_write(mcam, REG_TWSIC1, rval); - spin_unlock_irqrestore(&mcam->dev_lock, flags); - - /* Unfortunately, reading TWSIC1 too soon after sending a command - * causes the device to die. - * Use a busy-wait because we often send a large quantity of small - * commands at-once; using msleep() would cause a lot of context - * switches which take longer than 2ms, resulting in a noticeable - * boot-time and capture-start delays. - */ - mdelay(2); - - /* - * Another sad fact is that sometimes, commands silently complete but - * cafe_smbus_write_done() never becomes aware of this. - * This happens at random and appears to possible occur with any - * command. - * We don't understand why this is. We work around this issue - * with the timeout in the wait below, assuming that all commands - * complete within the timeout. - */ - wait_event_timeout(cam->smbus_wait, cafe_smbus_write_done(mcam), - CAFE_SMBUS_TIMEOUT); - - spin_lock_irqsave(&mcam->dev_lock, flags); - rval = mcam_reg_read(mcam, REG_TWSIC1); - spin_unlock_irqrestore(&mcam->dev_lock, flags); - - if (rval & TWSIC1_WSTAT) { - cam_err(cam, "SMBUS write (%02x/%02x/%02x) timed out\n", addr, - command, value); - return -EIO; - } - if (rval & TWSIC1_ERROR) { - cam_err(cam, "SMBUS write (%02x/%02x/%02x) error\n", addr, - command, value); - return -EIO; - } - return 0; -} - - - -static int cafe_smbus_read_done(struct mcam_camera *mcam) -{ - unsigned long flags; - int c1; - - /* - * We must delay after the interrupt, or the controller gets confused - * and never does give us good status. Fortunately, we don't do this - * often. - */ - udelay(20); - spin_lock_irqsave(&mcam->dev_lock, flags); - c1 = mcam_reg_read(mcam, REG_TWSIC1); - spin_unlock_irqrestore(&mcam->dev_lock, flags); - return c1 & (TWSIC1_RVALID|TWSIC1_ERROR); -} - - - -static int cafe_smbus_read_data(struct cafe_camera *cam, - u16 addr, u8 command, u8 *value) -{ - unsigned int rval; - unsigned long flags; - struct mcam_camera *mcam = &cam->mcam; - - spin_lock_irqsave(&mcam->dev_lock, flags); - rval = TWSIC0_EN | ((addr << TWSIC0_SID_SHIFT) & TWSIC0_SID); - rval |= TWSIC0_OVMAGIC; /* Make OV sensors work */ - /* - * Marvel sez set clkdiv to all 1's for now. - */ - rval |= TWSIC0_CLKDIV; - mcam_reg_write(mcam, REG_TWSIC0, rval); - (void) mcam_reg_read(mcam, REG_TWSIC1); /* force write */ - rval = TWSIC1_READ | ((command << TWSIC1_ADDR_SHIFT) & TWSIC1_ADDR); - mcam_reg_write(mcam, REG_TWSIC1, rval); - spin_unlock_irqrestore(&mcam->dev_lock, flags); - - wait_event_timeout(cam->smbus_wait, - cafe_smbus_read_done(mcam), CAFE_SMBUS_TIMEOUT); - spin_lock_irqsave(&mcam->dev_lock, flags); - rval = mcam_reg_read(mcam, REG_TWSIC1); - spin_unlock_irqrestore(&mcam->dev_lock, flags); - - if (rval & TWSIC1_ERROR) { - cam_err(cam, "SMBUS read (%02x/%02x) error\n", addr, command); - return -EIO; - } - if (!(rval & TWSIC1_RVALID)) { - cam_err(cam, "SMBUS read (%02x/%02x) timed out\n", addr, - command); - return -EIO; - } - *value = rval & 0xff; - return 0; -} - -/* - * Perform a transfer over SMBUS. This thing is called under - * the i2c bus lock, so we shouldn't race with ourselves... - */ -static int cafe_smbus_xfer(struct i2c_adapter *adapter, u16 addr, - unsigned short flags, char rw, u8 command, - int size, union i2c_smbus_data *data) -{ - struct cafe_camera *cam = i2c_get_adapdata(adapter); - int ret = -EINVAL; - - /* - * This interface would appear to only do byte data ops. OK - * it can do word too, but the cam chip has no use for that. - */ - if (size != I2C_SMBUS_BYTE_DATA) { - cam_err(cam, "funky xfer size %d\n", size); - return -EINVAL; - } - - if (rw == I2C_SMBUS_WRITE) - ret = cafe_smbus_write_data(cam, addr, command, data->byte); - else if (rw == I2C_SMBUS_READ) - ret = cafe_smbus_read_data(cam, addr, command, &data->byte); - return ret; -} - - -static void cafe_smbus_enable_irq(struct cafe_camera *cam) -{ - unsigned long flags; - - spin_lock_irqsave(&cam->mcam.dev_lock, flags); - mcam_reg_set_bit(&cam->mcam, REG_IRQMASK, TWSIIRQS); - spin_unlock_irqrestore(&cam->mcam.dev_lock, flags); -} - -static u32 cafe_smbus_func(struct i2c_adapter *adapter) -{ - return I2C_FUNC_SMBUS_READ_BYTE_DATA | - I2C_FUNC_SMBUS_WRITE_BYTE_DATA; -} - -static struct i2c_algorithm cafe_smbus_algo = { - .smbus_xfer = cafe_smbus_xfer, - .functionality = cafe_smbus_func -}; - -static int cafe_smbus_setup(struct cafe_camera *cam) -{ - struct i2c_adapter *adap; - int ret; - - adap = kzalloc(sizeof(*adap), GFP_KERNEL); - if (adap == NULL) - return -ENOMEM; - cam->mcam.i2c_adapter = adap; - cafe_smbus_enable_irq(cam); - adap->owner = THIS_MODULE; - adap->algo = &cafe_smbus_algo; - strcpy(adap->name, "cafe_ccic"); - adap->dev.parent = &cam->pdev->dev; - i2c_set_adapdata(adap, cam); - ret = i2c_add_adapter(adap); - if (ret) - printk(KERN_ERR "Unable to register cafe i2c adapter\n"); - return ret; -} - -static void cafe_smbus_shutdown(struct cafe_camera *cam) -{ - i2c_del_adapter(cam->mcam.i2c_adapter); - kfree(cam->mcam.i2c_adapter); -} - - -/* - * Controller-level stuff - */ - -static void cafe_ctlr_init(struct mcam_camera *mcam) -{ - unsigned long flags; - - spin_lock_irqsave(&mcam->dev_lock, flags); - /* - * Added magic to bring up the hardware on the B-Test board - */ - mcam_reg_write(mcam, 0x3038, 0x8); - mcam_reg_write(mcam, 0x315c, 0x80008); - /* - * Go through the dance needed to wake the device up. - * Note that these registers are global and shared - * with the NAND and SD devices. Interaction between the - * three still needs to be examined. - */ - mcam_reg_write(mcam, REG_GL_CSR, GCSR_SRS|GCSR_MRS); /* Needed? */ - mcam_reg_write(mcam, REG_GL_CSR, GCSR_SRC|GCSR_MRC); - mcam_reg_write(mcam, REG_GL_CSR, GCSR_SRC|GCSR_MRS); - /* - * Here we must wait a bit for the controller to come around. - */ - spin_unlock_irqrestore(&mcam->dev_lock, flags); - msleep(5); - spin_lock_irqsave(&mcam->dev_lock, flags); - - mcam_reg_write(mcam, REG_GL_CSR, GCSR_CCIC_EN|GCSR_SRC|GCSR_MRC); - mcam_reg_set_bit(mcam, REG_GL_IMASK, GIMSK_CCIC_EN); - /* - * Mask all interrupts. - */ - mcam_reg_write(mcam, REG_IRQMASK, 0); - spin_unlock_irqrestore(&mcam->dev_lock, flags); -} - - -static void cafe_ctlr_power_up(struct mcam_camera *mcam) -{ - /* - * Part one of the sensor dance: turn the global - * GPIO signal on. - */ - mcam_reg_write(mcam, REG_GL_FCR, GFCR_GPIO_ON); - mcam_reg_write(mcam, REG_GL_GPIOR, GGPIO_OUT|GGPIO_VAL); - /* - * Put the sensor into operational mode (assumes OLPC-style - * wiring). Control 0 is reset - set to 1 to operate. - * Control 1 is power down, set to 0 to operate. - */ - mcam_reg_write(mcam, REG_GPR, GPR_C1EN|GPR_C0EN); /* pwr up, reset */ - mcam_reg_write(mcam, REG_GPR, GPR_C1EN|GPR_C0EN|GPR_C0); -} - -static void cafe_ctlr_power_down(struct mcam_camera *mcam) -{ - mcam_reg_write(mcam, REG_GPR, GPR_C1EN|GPR_C0EN|GPR_C1); - mcam_reg_write(mcam, REG_GL_FCR, GFCR_GPIO_ON); - mcam_reg_write(mcam, REG_GL_GPIOR, GGPIO_OUT); -} - - - -/* - * The platform interrupt handler. - */ -static irqreturn_t cafe_irq(int irq, void *data) -{ - struct cafe_camera *cam = data; - struct mcam_camera *mcam = &cam->mcam; - unsigned int irqs, handled; - - spin_lock(&mcam->dev_lock); - irqs = mcam_reg_read(mcam, REG_IRQSTAT); - handled = cam->registered && mccic_irq(mcam, irqs); - if (irqs & TWSIIRQS) { - mcam_reg_write(mcam, REG_IRQSTAT, TWSIIRQS); - wake_up(&cam->smbus_wait); - handled = 1; - } - spin_unlock(&mcam->dev_lock); - return IRQ_RETVAL(handled); -} - - -/* -------------------------------------------------------------------------- */ -/* - * PCI interface stuff. - */ - -static int cafe_pci_probe(struct pci_dev *pdev, - const struct pci_device_id *id) -{ - int ret; - struct cafe_camera *cam; - struct mcam_camera *mcam; - - /* - * Start putting together one of our big camera structures. - */ - ret = -ENOMEM; - cam = kzalloc(sizeof(struct cafe_camera), GFP_KERNEL); - if (cam == NULL) - goto out; - cam->pdev = pdev; - mcam = &cam->mcam; - mcam->chip_id = V4L2_IDENT_CAFE; - spin_lock_init(&mcam->dev_lock); - init_waitqueue_head(&cam->smbus_wait); - mcam->plat_power_up = cafe_ctlr_power_up; - mcam->plat_power_down = cafe_ctlr_power_down; - mcam->dev = &pdev->dev; - /* - * Set the clock speed for the XO 1; I don't believe this - * driver has ever run anywhere else. - */ - mcam->clock_speed = 45; - mcam->use_smbus = 1; - /* - * Vmalloc mode for buffers is traditional with this driver. - * We *might* be able to run DMA_contig, especially on a system - * with CMA in it. - */ - mcam->buffer_mode = B_vmalloc; - /* - * Get set up on the PCI bus. - */ - ret = pci_enable_device(pdev); - if (ret) - goto out_free; - pci_set_master(pdev); - - ret = -EIO; - mcam->regs = pci_iomap(pdev, 0, 0); - if (!mcam->regs) { - printk(KERN_ERR "Unable to ioremap cafe-ccic regs\n"); - goto out_disable; - } - ret = request_irq(pdev->irq, cafe_irq, IRQF_SHARED, "cafe-ccic", cam); - if (ret) - goto out_iounmap; - - /* - * Initialize the controller and leave it powered up. It will - * stay that way until the sensor driver shows up. - */ - cafe_ctlr_init(mcam); - cafe_ctlr_power_up(mcam); - /* - * Set up I2C/SMBUS communications. We have to drop the mutex here - * because the sensor could attach in this call chain, leading to - * unsightly deadlocks. - */ - ret = cafe_smbus_setup(cam); - if (ret) - goto out_pdown; - - ret = mccic_register(mcam); - if (ret == 0) { - cam->registered = 1; - return 0; - } - - cafe_smbus_shutdown(cam); -out_pdown: - cafe_ctlr_power_down(mcam); - free_irq(pdev->irq, cam); -out_iounmap: - pci_iounmap(pdev, mcam->regs); -out_disable: - pci_disable_device(pdev); -out_free: - kfree(cam); -out: - return ret; -} - - -/* - * Shut down an initialized device - */ -static void cafe_shutdown(struct cafe_camera *cam) -{ - mccic_shutdown(&cam->mcam); - cafe_smbus_shutdown(cam); - free_irq(cam->pdev->irq, cam); - pci_iounmap(cam->pdev, cam->mcam.regs); -} - - -static void cafe_pci_remove(struct pci_dev *pdev) -{ - struct v4l2_device *v4l2_dev = dev_get_drvdata(&pdev->dev); - struct cafe_camera *cam = to_cam(v4l2_dev); - - if (cam == NULL) { - printk(KERN_WARNING "pci_remove on unknown pdev %p\n", pdev); - return; - } - cafe_shutdown(cam); - kfree(cam); -} - - -#ifdef CONFIG_PM -/* - * Basic power management. - */ -static int cafe_pci_suspend(struct pci_dev *pdev, pm_message_t state) -{ - struct v4l2_device *v4l2_dev = dev_get_drvdata(&pdev->dev); - struct cafe_camera *cam = to_cam(v4l2_dev); - int ret; - - ret = pci_save_state(pdev); - if (ret) - return ret; - mccic_suspend(&cam->mcam); - pci_disable_device(pdev); - return 0; -} - - -static int cafe_pci_resume(struct pci_dev *pdev) -{ - struct v4l2_device *v4l2_dev = dev_get_drvdata(&pdev->dev); - struct cafe_camera *cam = to_cam(v4l2_dev); - int ret = 0; - - pci_restore_state(pdev); - ret = pci_enable_device(pdev); - - if (ret) { - cam_warn(cam, "Unable to re-enable device on resume!\n"); - return ret; - } - cafe_ctlr_init(&cam->mcam); - return mccic_resume(&cam->mcam); -} - -#endif /* CONFIG_PM */ - -static struct pci_device_id cafe_ids[] = { - { PCI_DEVICE(PCI_VENDOR_ID_MARVELL, - PCI_DEVICE_ID_MARVELL_88ALP01_CCIC) }, - { 0, } -}; - -MODULE_DEVICE_TABLE(pci, cafe_ids); - -static struct pci_driver cafe_pci_driver = { - .name = "cafe1000-ccic", - .id_table = cafe_ids, - .probe = cafe_pci_probe, - .remove = cafe_pci_remove, -#ifdef CONFIG_PM - .suspend = cafe_pci_suspend, - .resume = cafe_pci_resume, -#endif -}; - - - - -static int __init cafe_init(void) -{ - int ret; - - printk(KERN_NOTICE "Marvell M88ALP01 'CAFE' Camera Controller version %d\n", - CAFE_VERSION); - ret = pci_register_driver(&cafe_pci_driver); - if (ret) { - printk(KERN_ERR "Unable to register cafe_ccic driver\n"); - goto out; - } - ret = 0; - -out: - return ret; -} - - -static void __exit cafe_exit(void) -{ - pci_unregister_driver(&cafe_pci_driver); -} - -module_init(cafe_init); -module_exit(cafe_exit); |