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linux-next/arch/arm/mach-pxa/pcm990-baseboard.c
Guennadi Liakhovetski 594bb46dbc V4L/DVB (11607): soc-camera: add a free_bus method to struct soc_camera_link 
Currently pcm990 camera bus-width management functions request a GPIO and never
free it again. With this approach the GPIO extender driver cannot be unloaded
once camera drivers have been loaded, also unloading theb i2c-pxa bus driver
produces errors, because the GPIO extender driver cannot unregister properly.
Another problem is, that if camera drivers are once loaded before the GPIO
extender driver, the platform code marks the GPIO unavailable and only a reboot
helps to recover. Adding an explicit free_bus method and using it in mt9m001
and mt9v022 drivers fixes these problems.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Acked-by: Eric Miao <eric.miao@marvell.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2009-06-16 18:20:43 -03:00

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/*
* arch/arm/mach-pxa/pcm990-baseboard.c
* Support for the Phytec phyCORE-PXA270 Development Platform (PCM-990).
*
* Refer
* http://www.phytec.com/products/rdk/ARM-XScale/phyCORE-XScale-PXA270.html
* for additional hardware info
*
* Author: Juergen Kilb
* Created: April 05, 2005
* Copyright: Phytec Messtechnik GmbH
* e-Mail: armlinux@phytec.de
*
* based on Intel Mainstone Board
*
* Copyright 2007 Juergen Beisert @ Pengutronix (j.beisert@pengutronix.de)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/irq.h>
#include <linux/platform_device.h>
#include <linux/i2c.h>
#include <linux/pwm_backlight.h>
#include <media/soc_camera.h>
#include <asm/gpio.h>
#include <plat/i2c.h>
#include <mach/camera.h>
#include <asm/mach/map.h>
#include <mach/pxa27x.h>
#include <mach/audio.h>
#include <mach/mmc.h>
#include <mach/ohci.h>
#include <mach/pcm990_baseboard.h>
#include <mach/pxafb.h>
#include "devices.h"
#include "generic.h"
static unsigned long pcm990_pin_config[] __initdata = {
/* MMC */
GPIO32_MMC_CLK,
GPIO112_MMC_CMD,
GPIO92_MMC_DAT_0,
GPIO109_MMC_DAT_1,
GPIO110_MMC_DAT_2,
GPIO111_MMC_DAT_3,
/* USB */
GPIO88_USBH1_PWR,
GPIO89_USBH1_PEN,
/* PWM0 */
GPIO16_PWM0_OUT,
/* I2C */
GPIO117_I2C_SCL,
GPIO118_I2C_SDA,
};
/*
* pcm990_lcd_power - control power supply to the LCD
* @on: 0 = switch off, 1 = switch on
*
* Called by the pxafb driver
*/
#ifndef CONFIG_PCM990_DISPLAY_NONE
static void pcm990_lcd_power(int on, struct fb_var_screeninfo *var)
{
if (on) {
/* enable LCD-Latches
* power on LCD
*/
__PCM990_CTRL_REG(PCM990_CTRL_PHYS + PCM990_CTRL_REG3) =
PCM990_CTRL_LCDPWR + PCM990_CTRL_LCDON;
} else {
/* disable LCD-Latches
* power off LCD
*/
__PCM990_CTRL_REG(PCM990_CTRL_PHYS + PCM990_CTRL_REG3) = 0x00;
}
}
#endif
#if defined(CONFIG_PCM990_DISPLAY_SHARP)
static struct pxafb_mode_info fb_info_sharp_lq084v1dg21 = {
.pixclock = 28000,
.xres = 640,
.yres = 480,
.bpp = 16,
.hsync_len = 20,
.left_margin = 103,
.right_margin = 47,
.vsync_len = 6,
.upper_margin = 28,
.lower_margin = 5,
.sync = 0,
.cmap_greyscale = 0,
};
static struct pxafb_mach_info pcm990_fbinfo __initdata = {
.modes = &fb_info_sharp_lq084v1dg21,
.num_modes = 1,
.lcd_conn = LCD_COLOR_TFT_16BPP | LCD_PCLK_EDGE_FALL,
.pxafb_lcd_power = pcm990_lcd_power,
};
#elif defined(CONFIG_PCM990_DISPLAY_NEC)
struct pxafb_mode_info fb_info_nec_nl6448bc20_18d = {
.pixclock = 39720,
.xres = 640,
.yres = 480,
.bpp = 16,
.hsync_len = 32,
.left_margin = 16,
.right_margin = 48,
.vsync_len = 2,
.upper_margin = 12,
.lower_margin = 17,
.sync = 0,
.cmap_greyscale = 0,
};
static struct pxafb_mach_info pcm990_fbinfo __initdata = {
.modes = &fb_info_nec_nl6448bc20_18d,
.num_modes = 1,
.lcd_conn = LCD_COLOR_TFT_16BPP | LCD_PCLK_EDGE_FALL,
.pxafb_lcd_power = pcm990_lcd_power,
};
#endif
static struct platform_pwm_backlight_data pcm990_backlight_data = {
.pwm_id = 0,
.max_brightness = 1023,
.dft_brightness = 1023,
.pwm_period_ns = 78770,
};
static struct platform_device pcm990_backlight_device = {
.name = "pwm-backlight",
.dev = {
.parent = &pxa27x_device_pwm0.dev,
.platform_data = &pcm990_backlight_data,
},
};
/*
* The PCM-990 development baseboard uses PCM-027's hardware in the
* following way:
*
* - LCD support is in use
* - GPIO16 is output for back light on/off with PWM
* - GPIO58 ... GPIO73 are outputs for display data
* - GPIO74 is output output for LCDFCLK
* - GPIO75 is output for LCDLCLK
* - GPIO76 is output for LCDPCLK
* - GPIO77 is output for LCDBIAS
* - MMC support is in use
* - GPIO32 is output for MMCCLK
* - GPIO92 is MMDAT0
* - GPIO109 is MMDAT1
* - GPIO110 is MMCS0
* - GPIO111 is MMCS1
* - GPIO112 is MMCMD
* - IDE/CF card is in use
* - GPIO48 is output /POE
* - GPIO49 is output /PWE
* - GPIO50 is output /PIOR
* - GPIO51 is output /PIOW
* - GPIO54 is output /PCE2
* - GPIO55 is output /PREG
* - GPIO56 is input /PWAIT
* - GPIO57 is output /PIOS16
* - GPIO79 is output PSKTSEL
* - GPIO85 is output /PCE1
* - FFUART is in use
* - GPIO34 is input FFRXD
* - GPIO35 is input FFCTS
* - GPIO36 is input FFDCD
* - GPIO37 is input FFDSR
* - GPIO38 is input FFRI
* - GPIO39 is output FFTXD
* - GPIO40 is output FFDTR
* - GPIO41 is output FFRTS
* - BTUART is in use
* - GPIO42 is input BTRXD
* - GPIO43 is output BTTXD
* - GPIO44 is input BTCTS
* - GPIO45 is output BTRTS
* - IRUART is in use
* - GPIO46 is input STDRXD
* - GPIO47 is output STDTXD
* - AC97 is in use*)
* - GPIO28 is input AC97CLK
* - GPIO29 is input AC97DatIn
* - GPIO30 is output AC97DatO
* - GPIO31 is output AC97SYNC
* - GPIO113 is output AC97_RESET
* - SSP is in use
* - GPIO23 is output SSPSCLK
* - GPIO24 is output chip select to Max7301
* - GPIO25 is output SSPTXD
* - GPIO26 is input SSPRXD
* - GPIO27 is input for Max7301 IRQ
* - GPIO53 is input SSPSYSCLK
* - SSP3 is in use
* - GPIO81 is output SSPTXD3
* - GPIO82 is input SSPRXD3
* - GPIO83 is output SSPSFRM
* - GPIO84 is output SSPCLK3
*
* Otherwise claimed GPIOs:
* GPIO1 -> IRQ from user switch
* GPIO9 -> IRQ from power management
* GPIO10 -> IRQ from WML9712 AC97 controller
* GPIO11 -> IRQ from IDE controller
* GPIO12 -> IRQ from CF controller
* GPIO13 -> IRQ from CF controller
* GPIO14 -> GPIO free
* GPIO15 -> /CS1 selects baseboard's Control CPLD (U7, 16 bit wide data path)
* GPIO19 -> GPIO free
* GPIO20 -> /SDCS2
* GPIO21 -> /CS3 PC card socket select
* GPIO33 -> /CS5 network controller select
* GPIO78 -> /CS2 (16 bit wide data path)
* GPIO80 -> /CS4 (16 bit wide data path)
* GPIO86 -> GPIO free
* GPIO87 -> GPIO free
* GPIO90 -> LED0 on CPU module
* GPIO91 -> LED1 on CPI module
* GPIO117 -> SCL
* GPIO118 -> SDA
*/
static unsigned long pcm990_irq_enabled;
static void pcm990_mask_ack_irq(unsigned int irq)
{
int pcm990_irq = (irq - PCM027_IRQ(0));
PCM990_INTMSKENA = (pcm990_irq_enabled &= ~(1 << pcm990_irq));
}
static void pcm990_unmask_irq(unsigned int irq)
{
int pcm990_irq = (irq - PCM027_IRQ(0));
/* the irq can be acknowledged only if deasserted, so it's done here */
PCM990_INTSETCLR |= 1 << pcm990_irq;
PCM990_INTMSKENA = (pcm990_irq_enabled |= (1 << pcm990_irq));
}
static struct irq_chip pcm990_irq_chip = {
.mask_ack = pcm990_mask_ack_irq,
.unmask = pcm990_unmask_irq,
};
static void pcm990_irq_handler(unsigned int irq, struct irq_desc *desc)
{
unsigned long pending = (~PCM990_INTSETCLR) & pcm990_irq_enabled;
do {
GEDR(PCM990_CTRL_INT_IRQ_GPIO) =
GPIO_bit(PCM990_CTRL_INT_IRQ_GPIO);
if (likely(pending)) {
irq = PCM027_IRQ(0) + __ffs(pending);
generic_handle_irq(irq);
}
pending = (~PCM990_INTSETCLR) & pcm990_irq_enabled;
} while (pending);
}
static void __init pcm990_init_irq(void)
{
int irq;
/* setup extra PCM990 irqs */
for (irq = PCM027_IRQ(0); irq <= PCM027_IRQ(3); irq++) {
set_irq_chip(irq, &pcm990_irq_chip);
set_irq_handler(irq, handle_level_irq);
set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
}
PCM990_INTMSKENA = 0x00; /* disable all Interrupts */
PCM990_INTSETCLR = 0xFF;
set_irq_chained_handler(PCM990_CTRL_INT_IRQ, pcm990_irq_handler);
set_irq_type(PCM990_CTRL_INT_IRQ, PCM990_CTRL_INT_IRQ_EDGE);
}
static int pcm990_mci_init(struct device *dev, irq_handler_t mci_detect_int,
void *data)
{
int err;
err = request_irq(PCM027_MMCDET_IRQ, mci_detect_int, IRQF_DISABLED,
"MMC card detect", data);
if (err)
printk(KERN_ERR "pcm990_mci_init: MMC/SD: can't request MMC "
"card detect IRQ\n");
return err;
}
static void pcm990_mci_setpower(struct device *dev, unsigned int vdd)
{
struct pxamci_platform_data *p_d = dev->platform_data;
if ((1 << vdd) & p_d->ocr_mask)
__PCM990_CTRL_REG(PCM990_CTRL_PHYS + PCM990_CTRL_REG5) =
PCM990_CTRL_MMC2PWR;
else
__PCM990_CTRL_REG(PCM990_CTRL_PHYS + PCM990_CTRL_REG5) =
~PCM990_CTRL_MMC2PWR;
}
static void pcm990_mci_exit(struct device *dev, void *data)
{
free_irq(PCM027_MMCDET_IRQ, data);
}
#define MSECS_PER_JIFFY (1000/HZ)
static struct pxamci_platform_data pcm990_mci_platform_data = {
.detect_delay = 250 / MSECS_PER_JIFFY,
.ocr_mask = MMC_VDD_32_33 | MMC_VDD_33_34,
.init = pcm990_mci_init,
.setpower = pcm990_mci_setpower,
.exit = pcm990_mci_exit,
};
static struct pxaohci_platform_data pcm990_ohci_platform_data = {
.port_mode = PMM_PERPORT_MODE,
.flags = ENABLE_PORT1 | POWER_CONTROL_LOW | POWER_SENSE_LOW,
.power_on_delay = 10,
};
/*
* PXA27x Camera specific stuff
*/
#if defined(CONFIG_VIDEO_PXA27x) || defined(CONFIG_VIDEO_PXA27x_MODULE)
static unsigned long pcm990_camera_pin_config[] = {
/* CIF */
GPIO98_CIF_DD_0,
GPIO105_CIF_DD_1,
GPIO104_CIF_DD_2,
GPIO103_CIF_DD_3,
GPIO95_CIF_DD_4,
GPIO94_CIF_DD_5,
GPIO93_CIF_DD_6,
GPIO108_CIF_DD_7,
GPIO107_CIF_DD_8,
GPIO106_CIF_DD_9,
GPIO42_CIF_MCLK,
GPIO45_CIF_PCLK,
GPIO43_CIF_FV,
GPIO44_CIF_LV,
};
static int pcm990_pxacamera_init(struct device *dev)
{
pxa2xx_mfp_config(ARRAY_AND_SIZE(pcm990_camera_pin_config));
return 0;
}
/*
* CICR4: PCLK_EN: Pixel clock is supplied by the sensor
* MCLK_EN: Master clock is generated by PXA
* PCP: Data sampled on the falling edge of pixel clock
*/
struct pxacamera_platform_data pcm990_pxacamera_platform_data = {
.init = pcm990_pxacamera_init,
.flags = PXA_CAMERA_MASTER | PXA_CAMERA_DATAWIDTH_8 | PXA_CAMERA_DATAWIDTH_10 |
PXA_CAMERA_PCLK_EN | PXA_CAMERA_MCLK_EN/* | PXA_CAMERA_PCP*/,
.mclk_10khz = 1000,
};
#include <linux/i2c/pca953x.h>
static struct pca953x_platform_data pca9536_data = {
.gpio_base = NR_BUILTIN_GPIO,
};
static int gpio_bus_switch = -EINVAL;
static int pcm990_camera_set_bus_param(struct soc_camera_link *link,
unsigned long flags)
{
if (gpio_bus_switch < 0) {
if (flags == SOCAM_DATAWIDTH_10)
return 0;
else
return -EINVAL;
}
if (flags & SOCAM_DATAWIDTH_8)
gpio_set_value(gpio_bus_switch, 1);
else
gpio_set_value(gpio_bus_switch, 0);
return 0;
}
static unsigned long pcm990_camera_query_bus_param(struct soc_camera_link *link)
{
int ret;
if (gpio_bus_switch < 0) {
ret = gpio_request(NR_BUILTIN_GPIO, "camera");
if (!ret) {
gpio_bus_switch = NR_BUILTIN_GPIO;
gpio_direction_output(gpio_bus_switch, 0);
}
}
if (gpio_bus_switch >= 0)
return SOCAM_DATAWIDTH_8 | SOCAM_DATAWIDTH_10;
else
return SOCAM_DATAWIDTH_10;
}
static void pcm990_camera_free_bus(struct soc_camera_link *link)
{
if (gpio_bus_switch < 0)
return;
gpio_free(gpio_bus_switch);
gpio_bus_switch = -EINVAL;
}
static struct soc_camera_link iclink = {
.bus_id = 0, /* Must match with the camera ID above */
.query_bus_param = pcm990_camera_query_bus_param,
.set_bus_param = pcm990_camera_set_bus_param,
.free_bus = pcm990_camera_free_bus,
};
/* Board I2C devices. */
static struct i2c_board_info __initdata pcm990_i2c_devices[] = {
{
/* Must initialize before the camera(s) */
I2C_BOARD_INFO("pca9536", 0x41),
.platform_data = &pca9536_data,
}, {
I2C_BOARD_INFO("mt9v022", 0x48),
.platform_data = &iclink, /* With extender */
}, {
I2C_BOARD_INFO("mt9m001", 0x5d),
.platform_data = &iclink, /* With extender */
},
};
#endif /* CONFIG_VIDEO_PXA27x ||CONFIG_VIDEO_PXA27x_MODULE */
/*
* enable generic access to the base board control CPLDs U6 and U7
*/
static struct map_desc pcm990_io_desc[] __initdata = {
{
.virtual = PCM990_CTRL_BASE,
.pfn = __phys_to_pfn(PCM990_CTRL_PHYS),
.length = PCM990_CTRL_SIZE,
.type = MT_DEVICE /* CPLD */
}, {
.virtual = PCM990_CF_PLD_BASE,
.pfn = __phys_to_pfn(PCM990_CF_PLD_PHYS),
.length = PCM990_CF_PLD_SIZE,
.type = MT_DEVICE /* CPLD */
}
};
/*
* system init for baseboard usage. Will be called by pcm027 init.
*
* Add platform devices present on this baseboard and init
* them from CPU side as far as required to use them later on
*/
void __init pcm990_baseboard_init(void)
{
pxa2xx_mfp_config(ARRAY_AND_SIZE(pcm990_pin_config));
/* register CPLD access */
iotable_init(ARRAY_AND_SIZE(pcm990_io_desc));
/* register CPLD's IRQ controller */
pcm990_init_irq();
#ifndef CONFIG_PCM990_DISPLAY_NONE
set_pxa_fb_info(&pcm990_fbinfo);
#endif
platform_device_register(&pcm990_backlight_device);
/* MMC */
pxa_set_mci_info(&pcm990_mci_platform_data);
/* USB host */
pxa_set_ohci_info(&pcm990_ohci_platform_data);
pxa_set_i2c_info(NULL);
pxa_set_ac97_info(NULL);
#if defined(CONFIG_VIDEO_PXA27x) || defined(CONFIG_VIDEO_PXA27x_MODULE)
pxa_set_camera_info(&pcm990_pxacamera_platform_data);
i2c_register_board_info(0, ARRAY_AND_SIZE(pcm990_i2c_devices));
#endif
printk(KERN_INFO "PCM-990 Evaluation baseboard initialized\n");
}
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