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linux/arch/arm/mach-exynos/mach-smdk4x12.c
Sachin Kamat bdd1853212 ARM: EXYNOS: Fix NULL pointer dereference bug in SMDK4X12 
When DRM support for Samsung SoC and Samsung S3C framebuffer support
are selected, the kernel crashes as it does not get the required
platform data. Change the compile macro to CONFIG_DRM_EXYNOS_FIMD
to fix this.

Fixes the following boot time crash:
Unable to handle kernel NULL pointer dereference at virtual address 00000000
PC is at 0x0
LR is at s3c_fb_probe+0x198/0x788
[<c0152270>] (s3c_fb_probe+0x198/0x788) from [<c019e52c>] (platform_drv_probe+0x18/0x1c)
[<c019e52c>] (platform_drv_probe+0x18/0x1c) from [<c019d2e4>] (driver_probe_device+0x70/0x1f0)
[<c019d2e4>] (driver_probe_device+0x70/0x1f0) from [<c019d4f0>] (__driver_attach+0x8c/0x90)
[<c019d4f0>] (__driver_attach+0x8c/0x90) from [<c019bc3c>] (bus_for_each_dev+0x50/0x7c)
[<c019bc3c>] (bus_for_each_dev+0x50/0x7c) from [<c019cb4c>] (bus_add_driver+0x170/0x23c)
[<c019cb4c>] (bus_add_driver+0x170/0x23c) from [<c019d9a4>] (driver_register+0x78/0x144)
[<c019d9a4>] (driver_register+0x78/0x144) from [<c000862c>] (do_one_initcall+0x34/0x174)
[<c000862c>] (do_one_initcall+0x34/0x174) from [<c020ed7c>] (kernel_init+0x100/0x2a0)
[<c020ed7c>] (kernel_init+0x100/0x2a0) from [<c000e118>] (ret_from_fork+0x14/0x3c)

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
2012-12-19 09:25:18 -08:00

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/*
* linux/arch/arm/mach-exynos4/mach-smdk4x12.c
*
* Copyright (c) 2011 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* 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/gpio.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/io.h>
#include <linux/lcd.h>
#include <linux/mfd/max8997.h>
#include <linux/mmc/host.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
#include <linux/pwm_backlight.h>
#include <linux/regulator/machine.h>
#include <linux/serial_core.h>
#include <linux/platform_data/i2c-s3c2410.h>
#include <linux/platform_data/s3c-hsotg.h>
#include <asm/mach/arch.h>
#include <asm/hardware/gic.h>
#include <asm/mach-types.h>
#include <video/samsung_fimd.h>
#include <plat/backlight.h>
#include <plat/clock.h>
#include <plat/cpu.h>
#include <plat/devs.h>
#include <plat/fb.h>
#include <plat/gpio-cfg.h>
#include <plat/keypad.h>
#include <plat/mfc.h>
#include <plat/regs-serial.h>
#include <plat/sdhci.h>
#include <mach/map.h>
#include <drm/exynos_drm.h>
#include "common.h"
/* Following are default values for UCON, ULCON and UFCON UART registers */
#define SMDK4X12_UCON_DEFAULT (S3C2410_UCON_TXILEVEL | \
S3C2410_UCON_RXILEVEL | \
S3C2410_UCON_TXIRQMODE | \
S3C2410_UCON_RXIRQMODE | \
S3C2410_UCON_RXFIFO_TOI | \
S3C2443_UCON_RXERR_IRQEN)
#define SMDK4X12_ULCON_DEFAULT S3C2410_LCON_CS8
#define SMDK4X12_UFCON_DEFAULT (S3C2410_UFCON_FIFOMODE | \
S5PV210_UFCON_TXTRIG4 | \
S5PV210_UFCON_RXTRIG4)
static struct s3c2410_uartcfg smdk4x12_uartcfgs[] __initdata = {
[0] = {
.hwport = 0,
.flags = 0,
.ucon = SMDK4X12_UCON_DEFAULT,
.ulcon = SMDK4X12_ULCON_DEFAULT,
.ufcon = SMDK4X12_UFCON_DEFAULT,
},
[1] = {
.hwport = 1,
.flags = 0,
.ucon = SMDK4X12_UCON_DEFAULT,
.ulcon = SMDK4X12_ULCON_DEFAULT,
.ufcon = SMDK4X12_UFCON_DEFAULT,
},
[2] = {
.hwport = 2,
.flags = 0,
.ucon = SMDK4X12_UCON_DEFAULT,
.ulcon = SMDK4X12_ULCON_DEFAULT,
.ufcon = SMDK4X12_UFCON_DEFAULT,
},
[3] = {
.hwport = 3,
.flags = 0,
.ucon = SMDK4X12_UCON_DEFAULT,
.ulcon = SMDK4X12_ULCON_DEFAULT,
.ufcon = SMDK4X12_UFCON_DEFAULT,
},
};
static struct s3c_sdhci_platdata smdk4x12_hsmmc2_pdata __initdata = {
.cd_type = S3C_SDHCI_CD_INTERNAL,
#ifdef CONFIG_EXYNOS4_SDHCI_CH2_8BIT
.max_width = 8,
.host_caps = MMC_CAP_8_BIT_DATA,
#endif
};
static struct s3c_sdhci_platdata smdk4x12_hsmmc3_pdata __initdata = {
.cd_type = S3C_SDHCI_CD_INTERNAL,
};
static struct regulator_consumer_supply max8997_buck1 =
REGULATOR_SUPPLY("vdd_arm", NULL);
static struct regulator_consumer_supply max8997_buck2 =
REGULATOR_SUPPLY("vdd_int", NULL);
static struct regulator_consumer_supply max8997_buck3 =
REGULATOR_SUPPLY("vdd_g3d", NULL);
static struct regulator_init_data max8997_buck1_data = {
.constraints = {
.name = "VDD_ARM_SMDK4X12",
.min_uV = 925000,
.max_uV = 1350000,
.always_on = 1,
.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,
.state_mem = {
.disabled = 1,
},
},
.num_consumer_supplies = 1,
.consumer_supplies = &max8997_buck1,
};
static struct regulator_init_data max8997_buck2_data = {
.constraints = {
.name = "VDD_INT_SMDK4X12",
.min_uV = 950000,
.max_uV = 1150000,
.always_on = 1,
.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE,
.state_mem = {
.disabled = 1,
},
},
.num_consumer_supplies = 1,
.consumer_supplies = &max8997_buck2,
};
static struct regulator_init_data max8997_buck3_data = {
.constraints = {
.name = "VDD_G3D_SMDK4X12",
.min_uV = 950000,
.max_uV = 1150000,
.valid_ops_mask = REGULATOR_CHANGE_VOLTAGE |
REGULATOR_CHANGE_STATUS,
.state_mem = {
.disabled = 1,
},
},
.num_consumer_supplies = 1,
.consumer_supplies = &max8997_buck3,
};
static struct max8997_regulator_data smdk4x12_max8997_regulators[] = {
{ MAX8997_BUCK1, &max8997_buck1_data },
{ MAX8997_BUCK2, &max8997_buck2_data },
{ MAX8997_BUCK3, &max8997_buck3_data },
};
static struct max8997_platform_data smdk4x12_max8997_pdata = {
.num_regulators = ARRAY_SIZE(smdk4x12_max8997_regulators),
.regulators = smdk4x12_max8997_regulators,
.buck1_voltage[0] = 1100000, /* 1.1V */
.buck1_voltage[1] = 1100000, /* 1.1V */
.buck1_voltage[2] = 1100000, /* 1.1V */
.buck1_voltage[3] = 1100000, /* 1.1V */
.buck1_voltage[4] = 1100000, /* 1.1V */
.buck1_voltage[5] = 1100000, /* 1.1V */
.buck1_voltage[6] = 1000000, /* 1.0V */
.buck1_voltage[7] = 950000, /* 0.95V */
.buck2_voltage[0] = 1100000, /* 1.1V */
.buck2_voltage[1] = 1000000, /* 1.0V */
.buck2_voltage[2] = 950000, /* 0.95V */
.buck2_voltage[3] = 900000, /* 0.9V */
.buck2_voltage[4] = 1100000, /* 1.1V */
.buck2_voltage[5] = 1000000, /* 1.0V */
.buck2_voltage[6] = 950000, /* 0.95V */
.buck2_voltage[7] = 900000, /* 0.9V */
.buck5_voltage[0] = 1100000, /* 1.1V */
.buck5_voltage[1] = 1100000, /* 1.1V */
.buck5_voltage[2] = 1100000, /* 1.1V */
.buck5_voltage[3] = 1100000, /* 1.1V */
.buck5_voltage[4] = 1100000, /* 1.1V */
.buck5_voltage[5] = 1100000, /* 1.1V */
.buck5_voltage[6] = 1100000, /* 1.1V */
.buck5_voltage[7] = 1100000, /* 1.1V */
};
static struct i2c_board_info smdk4x12_i2c_devs0[] __initdata = {
{
I2C_BOARD_INFO("max8997", 0x66),
.platform_data = &smdk4x12_max8997_pdata,
}
};
static struct i2c_board_info smdk4x12_i2c_devs1[] __initdata = {
{ I2C_BOARD_INFO("wm8994", 0x1a), }
};
static struct i2c_board_info smdk4x12_i2c_devs3[] __initdata = {
/* nothing here yet */
};
static struct i2c_board_info smdk4x12_i2c_devs7[] __initdata = {
/* nothing here yet */
};
static struct samsung_bl_gpio_info smdk4x12_bl_gpio_info = {
.no = EXYNOS4_GPD0(1),
.func = S3C_GPIO_SFN(2),
};
static struct platform_pwm_backlight_data smdk4x12_bl_data = {
.pwm_id = 1,
.pwm_period_ns = 1000,
};
static struct pwm_lookup smdk4x12_pwm_lookup[] = {
PWM_LOOKUP("s3c24xx-pwm.1", 0, "pwm-backlight.0", NULL),
};
static uint32_t smdk4x12_keymap[] __initdata = {
/* KEY(row, col, keycode) */
KEY(1, 3, KEY_1), KEY(1, 4, KEY_2), KEY(1, 5, KEY_3),
KEY(1, 6, KEY_4), KEY(1, 7, KEY_5),
KEY(2, 5, KEY_D), KEY(2, 6, KEY_A), KEY(2, 7, KEY_B),
KEY(0, 7, KEY_E), KEY(0, 5, KEY_C)
};
static struct matrix_keymap_data smdk4x12_keymap_data __initdata = {
.keymap = smdk4x12_keymap,
.keymap_size = ARRAY_SIZE(smdk4x12_keymap),
};
static struct samsung_keypad_platdata smdk4x12_keypad_data __initdata = {
.keymap_data = &smdk4x12_keymap_data,
.rows = 3,
.cols = 8,
};
#ifdef CONFIG_DRM_EXYNOS_FIMD
static struct exynos_drm_fimd_pdata drm_fimd_pdata = {
.panel = {
.timing = {
.left_margin = 8,
.right_margin = 8,
.upper_margin = 6,
.lower_margin = 6,
.hsync_len = 6,
.vsync_len = 4,
.xres = 480,
.yres = 800,
},
},
.vidcon0 = VIDCON0_VIDOUT_RGB | VIDCON0_PNRMODE_RGB,
.vidcon1 = VIDCON1_INV_HSYNC | VIDCON1_INV_VSYNC,
.default_win = 0,
.bpp = 32,
};
#else
static struct s3c_fb_pd_win smdk4x12_fb_win0 = {
.xres = 480,
.yres = 800,
.virtual_x = 480,
.virtual_y = 800 * 2,
.max_bpp = 32,
.default_bpp = 24,
};
static struct fb_videomode smdk4x12_lcd_timing = {
.left_margin = 8,
.right_margin = 8,
.upper_margin = 6,
.lower_margin = 6,
.hsync_len = 6,
.vsync_len = 4,
.xres = 480,
.yres = 800,
};
static struct s3c_fb_platdata smdk4x12_lcd_pdata __initdata = {
.win[0] = &smdk4x12_fb_win0,
.vtiming = &smdk4x12_lcd_timing,
.vidcon0 = VIDCON0_VIDOUT_RGB | VIDCON0_PNRMODE_RGB,
.vidcon1 = VIDCON1_INV_HSYNC | VIDCON1_INV_VSYNC,
.setup_gpio = exynos4_fimd0_gpio_setup_24bpp,
};
#endif
/* USB OTG */
static struct s3c_hsotg_plat smdk4x12_hsotg_pdata;
static struct platform_device *smdk4x12_devices[] __initdata = {
&s3c_device_hsmmc2,
&s3c_device_hsmmc3,
&s3c_device_i2c0,
&s3c_device_i2c1,
&s3c_device_i2c3,
&s3c_device_i2c7,
&s3c_device_rtc,
&s3c_device_usb_hsotg,
&s3c_device_wdt,
&s5p_device_fimc0,
&s5p_device_fimc1,
&s5p_device_fimc2,
&s5p_device_fimc3,
&s5p_device_fimc_md,
&s5p_device_fimd0,
&s5p_device_mfc,
&s5p_device_mfc_l,
&s5p_device_mfc_r,
&samsung_device_keypad,
};
static void __init smdk4x12_map_io(void)
{
exynos_init_io(NULL, 0);
s3c24xx_init_clocks(clk_xusbxti.rate);
s3c24xx_init_uarts(smdk4x12_uartcfgs, ARRAY_SIZE(smdk4x12_uartcfgs));
}
static void __init smdk4x12_reserve(void)
{
s5p_mfc_reserve_mem(0x43000000, 8 << 20, 0x51000000, 8 << 20);
}
static void __init smdk4x12_machine_init(void)
{
s3c_i2c0_set_platdata(NULL);
i2c_register_board_info(0, smdk4x12_i2c_devs0,
ARRAY_SIZE(smdk4x12_i2c_devs0));
s3c_i2c1_set_platdata(NULL);
i2c_register_board_info(1, smdk4x12_i2c_devs1,
ARRAY_SIZE(smdk4x12_i2c_devs1));
s3c_i2c3_set_platdata(NULL);
i2c_register_board_info(3, smdk4x12_i2c_devs3,
ARRAY_SIZE(smdk4x12_i2c_devs3));
s3c_i2c7_set_platdata(NULL);
i2c_register_board_info(7, smdk4x12_i2c_devs7,
ARRAY_SIZE(smdk4x12_i2c_devs7));
samsung_bl_set(&smdk4x12_bl_gpio_info, &smdk4x12_bl_data);
pwm_add_table(smdk4x12_pwm_lookup, ARRAY_SIZE(smdk4x12_pwm_lookup));
samsung_keypad_set_platdata(&smdk4x12_keypad_data);
s3c_sdhci2_set_platdata(&smdk4x12_hsmmc2_pdata);
s3c_sdhci3_set_platdata(&smdk4x12_hsmmc3_pdata);
s3c_hsotg_set_platdata(&smdk4x12_hsotg_pdata);
#ifdef CONFIG_DRM_EXYNOS_FIMD
s5p_device_fimd0.dev.platform_data = &drm_fimd_pdata;
exynos4_fimd0_gpio_setup_24bpp();
#else
s5p_fimd0_set_platdata(&smdk4x12_lcd_pdata);
#endif
platform_add_devices(smdk4x12_devices, ARRAY_SIZE(smdk4x12_devices));
}
MACHINE_START(SMDK4212, "SMDK4212")
/* Maintainer: Kukjin Kim <kgene.kim@samsung.com> */
.atag_offset = 0x100,
.smp = smp_ops(exynos_smp_ops),
.init_irq = exynos4_init_irq,
.map_io = smdk4x12_map_io,
.handle_irq = gic_handle_irq,
.init_machine = smdk4x12_machine_init,
.timer = &exynos4_timer,
.restart = exynos4_restart,
.reserve = &smdk4x12_reserve,
MACHINE_END
MACHINE_START(SMDK4412, "SMDK4412")
/* Maintainer: Kukjin Kim <kgene.kim@samsung.com> */
/* Maintainer: Changhwan Youn <chaos.youn@samsung.com> */
.atag_offset = 0x100,
.smp = smp_ops(exynos_smp_ops),
.init_irq = exynos4_init_irq,
.map_io = smdk4x12_map_io,
.handle_irq = gic_handle_irq,
.init_machine = smdk4x12_machine_init,
.init_late = exynos_init_late,
.timer = &exynos4_timer,
.restart = exynos4_restart,
.reserve = &smdk4x12_reserve,
MACHINE_END
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