RE: [PATCH 4/6] ARM: S5P64X0: Add GPIO and SPCON settings for LCD

[Kukjin Kim <kgene.kim@samsung.com>]

Ajay Kumar wrote:
> 
> This patch adds:
> o GPIO lines settings(HSYNC, VSYNC, VCLK and VD) for LCD.
> o Function to select type of LCD interface (RGB/i80)
> 
> Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com>
> ---
>  arch/arm/mach-s5p64x0/Kconfig                  |    6 +++
>  arch/arm/mach-s5p64x0/Makefile                 |    1 +
>  arch/arm/mach-s5p64x0/include/mach/regs-gpio.h |    4 ++
>  arch/arm/mach-s5p64x0/setup-fb.c               |   48
> ++++++++++++++++++++++++
>  arch/arm/plat-samsung/include/plat/fb.h        |   14 +++++++
>  5 files changed, 73 insertions(+), 0 deletions(-)
>  create mode 100644 arch/arm/mach-s5p64x0/setup-fb.c
> 
> diff --git a/arch/arm/mach-s5p64x0/Kconfig b/arch/arm/mach-s5p64x0/Kconfig
> index 017af4c..2ca5ac0 100644
> --- a/arch/arm/mach-s5p64x0/Kconfig
> +++ b/arch/arm/mach-s5p64x0/Kconfig
> @@ -21,6 +21,12 @@ config CPU_S5P6450
>  	help
>  	  Enable S5P6450 CPU support
> 
> +config S5P64X0_SETUP_FB
> +	bool
> +	help
> +	  Common setup code for S5P64X0 based boards with a LCD display
> +	  through RGB interface.
> +
>  config S5P64X0_SETUP_I2C1
>  	bool
>  	help
> diff --git a/arch/arm/mach-s5p64x0/Makefile
b/arch/arm/mach-s5p64x0/Makefile
> index ae6bf6f..43698c6 100644
> --- a/arch/arm/mach-s5p64x0/Makefile
> +++ b/arch/arm/mach-s5p64x0/Makefile
> @@ -28,3 +28,4 @@ obj-y				+= dev-audio.o
>  obj-$(CONFIG_S3C64XX_DEV_SPI)	+= dev-spi.o
> 
>  obj-$(CONFIG_S5P64X0_SETUP_I2C1)	+= setup-i2c1.o
> +obj-$(CONFIG_S5P64X0_SETUP_FB)		+= setup-fb.o
> diff --git a/arch/arm/mach-s5p64x0/include/mach/regs-gpio.h
b/arch/arm/mach-
> s5p64x0/include/mach/regs-gpio.h
> index 0953ef6..2f07cbd 100644
> --- a/arch/arm/mach-s5p64x0/include/mach/regs-gpio.h
> +++ b/arch/arm/mach-s5p64x0/include/mach/regs-gpio.h
> @@ -34,4 +34,8 @@
>  #define S5P6450_GPQ_BASE		(S5P_VA_GPIO + 0x0180)
>  #define S5P6450_GPS_BASE		(S5P_VA_GPIO + 0x0300)
> 
> +#define S5P64X0_SPCON0			(S5P_VA_GPIO + 0x1A0)
> +#define S5P64X0_SPCON0_LCD_SEL_MASK	(0x3 << 0)
> +#define S5P64X0_SPCON0_LCD_SEL_RGB	(0x1 << 0)
> +
>  #endif /* __ASM_ARCH_REGS_GPIO_H */
> diff --git a/arch/arm/mach-s5p64x0/setup-fb.c
b/arch/arm/mach-s5p64x0/setup-fb.c
> new file mode 100644
> index 0000000..3e8ffad
> --- /dev/null
> +++ b/arch/arm/mach-s5p64x0/setup-fb.c
> @@ -0,0 +1,48 @@
> +/* linux/arch/arm/mach-s5p64x0/setup-fb.c
> + *
> + * Copyright (c) 2011 Samsung Electronics Co., Ltd.
> + * 		http://www.samsung.com/
> + *
> + * Base S5P64X0 GPIO setup information for LCD framebuffer
> + *
> + * GPIO settings for LCD on any other board based on s5p64x0
> + * should go in this file.
> + *
> + * 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/fb.h>
> +#include <linux/gpio.h>
> +
> +#include <plat/fb.h>
> +#include <plat/gpio-cfg.h>
> +
> +#include <mach/regs-clock.h>
> +#include <mach/regs-gpio.h>
> +
> +void s5p64x0_fb_init(int lcd_interface_type)
> +{
> +	unsigned int cfg;
> +
> +	/* select TFT LCD type (RGB I/F) */
> +	cfg = readl(S5P64X0_SPCON0);

Since no need memory barrier here, just use __raw_readl

> +	cfg &= ~S5P64X0_SPCON0_LCD_SEL_MASK;
> +	cfg |= lcd_interface_type;
> +	writel(cfg, S5P64X0_SPCON0);

__raw_writel

> +}
> +
> +void s5p64x0_fb_gpio_setup_24bpp(void)
> +{
> +	unsigned int cfg;
> +
> +	cfg = readl(S5P64X0_SYS_ID) & 0xf0000;
> +	if (cfg == 0x40000) {
> +		s3c_gpio_cfgrange_nopull(S5P6440_GPI(0), 16,
> S3C_GPIO_SFN(2));
> +		s3c_gpio_cfgrange_nopull(S5P6440_GPJ(0), 12,
> S3C_GPIO_SFN(2));
> +	} else if (cfg == 0x50000) {
> +		s3c_gpio_cfgrange_nopull(S5P6450_GPI(0), 16,
> S3C_GPIO_SFN(2));
> +		s3c_gpio_cfgrange_nopull(S5P6450_GPJ(0), 12,
> S3C_GPIO_SFN(2));
> +	}

Following is more make sense ?

+	unsigned int chipid;
+
+	chipid = __raw_readl(S5P64X0_SYS_ID) & 0xff000;
+	if (chipd == 0x50000) {
+		s3c_gpio_cfgrange_nopull(S5P6450_GPI(0), 16,
S3C_GPIO_SFN(2));
+		s3c_gpio_cfgrange_nopull(S5P6450_GPJ(0), 12,
S3C_GPIO_SFN(2));
+	} else {
+		s3c_gpio_cfgrange_nopull(S5P6440_GPI(0), 16,
S3C_GPIO_SFN(2));
+		s3c_gpio_cfgrange_nopull(S5P6440_GPJ(0), 12,
S3C_GPIO_SFN(2));
+	}

> +}
> diff --git a/arch/arm/plat-samsung/include/plat/fb.h b/arch/arm/plat-
> samsung/include/plat/fb.h
> index cb3ca3a..8147c59 100644
> --- a/arch/arm/plat-samsung/include/plat/fb.h
> +++ b/arch/arm/plat-samsung/include/plat/fb.h
> @@ -94,4 +94,18 @@ extern void s5pc100_fb_gpio_setup_24bpp(void);
>   */
>  extern void s5pv210_fb_gpio_setup_24bpp(void);
> 
> +/**
> + * s5p64x0_fb_init() - Common setup function for LCD
> + *
> + * Select LCD I/F configuration-RGB style or i80 style
> + */
> +extern void s5p64x0_fb_init(int lcd_interface_type);
> +
> +/**
> + * s5p64x0_fb_gpio_setup_24bpp() - Common GPIO setup function for LCD
> + *
> + * Initialise the GPIO for a LCD display on the RGB interface.
> + */
> +extern void s5p64x0_fb_gpio_setup_24bpp(void);
> +
>  #endif /* __PLAT_S3C_FB_H */
> --
> 1.7.1


Thanks.

Best regards,
Kgene.
--
Kukjin Kim <kgene.kim@samsung.com>, Senior Engineer,
SW Solution Development Team, Samsung Electronics Co., Ltd.