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ARM: mx50: Add support to get the silicon revision 

For MX50, the HW_ADADIG_DIGPROG register in the ANATOP module will
have the correct silicon revision:

Major       Minor   Description
0x50        0x0     TO1.0
0x50        0x1     TO1.1

Signed-off-by: Dinh Nguyen <Dinh.Nguyen@freescale.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Dinh Nguyen 2011-03-21 16:30:35 -05:00 committed by Sascha Hauer
parent 021ebc2da0
commit 16f246e69b
2 changed files with 43 additions and 0 deletions
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39
arch/arm/mach-mx5/cpu.c
View File

@ -21,6 +21,7 @@
static int cpu_silicon_rev = -1;
#define IIM_SREV 0x24
#define MX50_HW_ADADIG_DIGPROG 0xB0
static int get_mx51_srev(void)
{
@ -127,6 +128,44 @@ int mx53_revision(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;

4
arch/arm/plat-mxc/include/mach/mx50.h
View File

@ -282,4 +282,8 @@
#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__ */