[PATCH 05/12] omap3evm: Add board revision function

[Hiremath, Vaibhav]

> -----Original Message-----
> From: Tony Lindgren [mailto:tony at atomide.com]
> Sent: Tuesday, November 17, 2009 4:58 AM
> To: linux-arm-kernel at lists.infradead.org
> Cc: Gupta, Ajay Kumar; linux-omap at vger.kernel.org; Hiremath,
> Vaibhav; Premi, Sanjeev
> Subject: [PATCH 05/12] omap3evm: Add board revision function
> 
> From: Ajay Kumar Gupta <ajay.gupta at ti.com>
> 
> Added function to differentiate between the OMAP3EVM revisions. The
> chip-id of the ethernet PHY is being used for this purpose.
> 
> Rev A to D : 0x01150000
> Rev >= E   : 0x92200000
> 
> Signed-off-by: Vaibhav Hiremath <hvaibhav at ti.com>
> Signed-off-by: Ajay Kumar Gupta <ajay.gupta at ti.com>
> Signed-off-by: Sanjeev Premi <premi at ti.com>
> Signed-off-by: Tony Lindgren <tony at atomide.com>
> ---
>  arch/arm/mach-omap2/board-omap3evm.c    |   33
> +++++++++++++++++++++++++++++++
>  arch/arm/plat-omap/include/plat/board.h |   18 +++++++++++++++++
>  2 files changed, 51 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/arm/mach-omap2/board-omap3evm.c b/arch/arm/mach-
> omap2/board-omap3evm.c
> index 1edf06a..6bb9a37 100644
> --- a/arch/arm/mach-omap2/board-omap3evm.c
> +++ b/arch/arm/mach-omap2/board-omap3evm.c
> @@ -46,9 +46,40 @@
> 
>  #define OMAP3EVM_ETHR_START	0x2c000000
>  #define OMAP3EVM_ETHR_SIZE	1024
> +#define OMAP3EVM_ETHR_ID_REV	0x50
>  #define OMAP3EVM_ETHR_GPIO_IRQ	176
>  #define OMAP3EVM_SMC911X_CS	5
> 
> +static u8 omap3_evm_version;
> +
> +u8 get_omap3_evm_rev(void)
> +{
> +	return omap3_evm_version;
> +}
> +EXPORT_SYMBOL(get_omap3_evm_rev);
> +
> +static void __init omap3_evm_get_revision(void)
> +{
> +	void __iomem *ioaddr;
> +	unsigned int smsc_id;
> +
> +	/* Ethernet PHY ID is stored at ID_REV register */
> +	ioaddr = ioremap_nocache(OMAP3EVM_ETHR_START, SZ_1K);
[Hiremath, Vaibhav] I think we should check for the return value.

Thanks,
Vaibhav
> +	smsc_id = readl(ioaddr + OMAP3EVM_ETHR_ID_REV) & 0xFFFF0000;
> +	iounmap(ioaddr);
> +
> +	switch (smsc_id) {
> +	/*SMSC9115 chipset*/
> +	case 0x01150000:
> +		omap3_evm_version = OMAP3EVM_BOARD_GEN_1;
> +		break;
> +	/*SMSC 9220 chipset*/
> +	case 0x92200000:
> +	default:
> +		omap3_evm_version = OMAP3EVM_BOARD_GEN_2;
> +	}
> +}
> +
>  static struct resource omap3evm_smc911x_resources[] = {
>  	[0] =	{
>  		.start	= OMAP3EVM_ETHR_START,
> @@ -321,6 +352,8 @@ static struct ehci_hcd_omap_platform_data
> ehci_pdata __initconst = {
> 
>  static void __init omap3_evm_init(void)
>  {
> +	omap3_evm_get_revision();
> +
>  	omap3_evm_i2c_init();
> 
>  	platform_add_devices(omap3_evm_devices,
> ARRAY_SIZE(omap3_evm_devices));
> diff --git a/arch/arm/plat-omap/include/plat/board.h
> b/arch/arm/plat-omap/include/plat/board.h
> index c4fc69f..abb17b6 100644
> --- a/arch/arm/plat-omap/include/plat/board.h
> +++ b/arch/arm/plat-omap/include/plat/board.h
> @@ -14,6 +14,18 @@
> 
>  #include <plat/gpio-switch.h>
> 
> +/*
> + * OMAP35x EVM revision
> + * Run time detection of EVM revision is done by reading Ethernet
> + * PHY ID -
> + *	GEN_1	= 0x01150000
> + *	GEN_2	= 0x92200000
> + */
> +enum {
> +	OMAP3EVM_BOARD_GEN_1 = 0,	/* EVM Rev between  A - D */
> +	OMAP3EVM_BOARD_GEN_2,		/* EVM Rev >= Rev E */
> +};
> +
>  /* Different peripheral ids */
>  #define OMAP_TAG_CLOCK		0x4f01
>  #define OMAP_TAG_LCD		0x4f05
> @@ -157,4 +169,10 @@ extern int omap_board_config_size;
>  /* for TI reference platforms sharing the same debug card */
>  extern int debug_card_init(u32 addr, unsigned gpio);
> 
> +/* OMAP3EVM revision */
> +#if defined(CONFIG_MACH_OMAP3EVM)
> +u8 get_omap3_evm_rev(void);
> +#else
> +#define get_omap3_evm_rev() (-EINVAL)
> +#endif
>  #endif
>