ARM: mx50: Add support to get the silicon revision

static int cpu_silicon_rev = -1;

#define IIM_SREV 0x24

#define MX50_HW_ADADIG_DIGPROG	0xB0

static int get_mx51_srev(void)

{

}

EXPORT_SYMBOL(mx53_revision);

static int get_mx50_srev(void)

{

	void __iomem *anatop = ioremap(MX50_ANATOP_BASE_ADDR, SZ_8K);

	u32 rev;

	if (!anatop) {

		cpu_silicon_rev = -EINVAL;

		return 0;

	}

	rev = readl(anatop + MX50_HW_ADADIG_DIGPROG);

	rev &= 0xff;

	iounmap(anatop);

	if (rev == 0x0)

		return IMX_CHIP_REVISION_1_0;

	else if (rev == 0x1)

		return IMX_CHIP_REVISION_1_1;

	return 0;

}

/*

 * Returns:

 *	the silicon revision of the cpu

 *	-EINVAL - not a mx50

 */

int mx50_revision(void)

{

	if (!cpu_is_mx50())

		return -EINVAL;

	if (cpu_silicon_rev == -1)

		cpu_silicon_rev = get_mx50_srev();

	return cpu_silicon_rev;

}

EXPORT_SYMBOL(mx50_revision);

static int __init post_cpu_init(void)

{

	unsigned int reg;

#define MX50_INT_APBHDMA_CHAN6	116

#define MX50_INT_APBHDMA_CHAN7	117

#if !defined(__ASSEMBLY__) && !defined(__MXC_BOOT_UNCOMPRESS)

extern int mx50_revision(void);

#endif

#endif /* ifndef __MACH_MX50_H__ */