ARM: imx: Get the silicon version from the IIM module

Instead of reading the silicon version from ROM, we should
read the SREV register from the IIM.

Freescale has dropped all support for MX51 REV1.0, only MX51
REV 2.0 and 3.0 are valid.

Signed-off-by: Dinh Nguyen <Dinh.Nguyen@freescale.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

13 files changed, 98 insertions, 110 deletions

diff --git a/arch/arm/mach-imx/clock-imx27.c b/arch/arm/mach-imx/clock-imx27.c
index 98a25bada783..2202b88667b5 100644
--- a/arch/arm/mach-imx/clock-imx27.c
+++ b/arch/arm/mach-imx/clock-imx27.c
@@ -125,7 +125,7 @@ static int clk_cpu_set_parent(struct clk *clk, struct clk *parent)
         if (clk->parent == parent)
                 return 0;
 
-        if (mx27_revision() >= CHIP_REV_2_0) {
+        if (mx27_revision() >= IMX_CHIP_REVISION_2_0) {
                 if (parent == &mpll_main1_clk) {
                         cscr |= CCM_CSCR_ARM_SRC;
                 } else {
@@ -174,7 +174,7 @@ static int set_rate_cpu(struct clk *clk, unsigned long rate)
         div--;
 
         reg = __raw_readl(CCM_CSCR);
-        if (mx27_revision() >= CHIP_REV_2_0) {
+        if (mx27_revision() >= IMX_CHIP_REVISION_2_0) {
                 reg &= ~(3 << 12);
                 reg |= div << 12;
                 reg &= ~(CCM_CSCR_FPM | CCM_CSCR_SPEN);
@@ -244,7 +244,7 @@ static unsigned long get_rate_ssix(struct clk *clk, unsigned long pdf)
 
         parent_rate = clk_get_rate(clk->parent);
 
-        if (mx27_revision() >= CHIP_REV_2_0)
+        if (mx27_revision() >= IMX_CHIP_REVISION_2_0)
                 pdf += 4;  /* MX27 TO2+ */
         else
                 pdf = (pdf < 2) ? 124UL : pdf;  /* MX21 & MX27 TO1 */
@@ -269,7 +269,7 @@ static unsigned long get_rate_nfc(struct clk *clk)
 
         parent_rate = clk_get_rate(clk->parent);
 
-        if (mx27_revision() >= CHIP_REV_2_0)
+        if (mx27_revision() >= IMX_CHIP_REVISION_2_0)
                 nfc_pdf = (__raw_readl(CCM_PCDR0) >> 6) & 0xf;
         else
                 nfc_pdf = (__raw_readl(CCM_PCDR0) >> 12) & 0xf;
@@ -284,7 +284,7 @@ static unsigned long get_rate_vpu(struct clk *clk)
 
         parent_rate = clk_get_rate(clk->parent);
 
-        if (mx27_revision() >= CHIP_REV_2_0) {
+        if (mx27_revision() >= IMX_CHIP_REVISION_2_0) {
                 vpu_pdf = (__raw_readl(CCM_PCDR0) >> 10) & 0x3f;
                 vpu_pdf += 4;
         } else {
@@ -347,7 +347,7 @@ static unsigned long get_rate_mpll_main(struct clk *clk)
          * clk->id == 0: arm clock source path 1 which is from 2 * MPLL / 2
          * clk->id == 1: arm clock source path 2 which is from 2 * MPLL / 3
          */
-        if (mx27_revision() >= CHIP_REV_2_0 && clk->id == 1)
+        if (mx27_revision() >= IMX_CHIP_REVISION_2_0 && clk->id == 1)
                 return 2UL * parent_rate / 3UL;
 
         return parent_rate;
@@ -365,7 +365,7 @@ static unsigned long get_rate_spll(struct clk *clk)
         /* On TO2 we have to write the value back. Otherwise we
          * read 0 from this register the next time.
          */
-        if (mx27_revision() >= CHIP_REV_2_0)
+        if (mx27_revision() >= IMX_CHIP_REVISION_2_0)
                 __raw_writel(reg, CCM_SPCTL0);
 
         return mxc_decode_pll(reg, rate);
@@ -376,7 +376,7 @@ static unsigned long get_rate_cpu(struct clk *clk)
         u32 div;
         unsigned long rate;
 
-        if (mx27_revision() >= CHIP_REV_2_0)
+        if (mx27_revision() >= IMX_CHIP_REVISION_2_0)
                 div = (__raw_readl(CCM_CSCR) >> 12) & 0x3;
         else
                 div = (__raw_readl(CCM_CSCR) >> 13) & 0x7;
@@ -389,7 +389,7 @@ static unsigned long get_rate_ahb(struct clk *clk)
 {
         unsigned long rate, bclk_pdf;
 
-        if (mx27_revision() >= CHIP_REV_2_0)
+        if (mx27_revision() >= IMX_CHIP_REVISION_2_0)
                 bclk_pdf = (__raw_readl(CCM_CSCR) >> 8) & 0x3;
         else
                 bclk_pdf = (__raw_readl(CCM_CSCR) >> 9) & 0xf;
@@ -402,7 +402,7 @@ static unsigned long get_rate_ipg(struct clk *clk)
 {
         unsigned long rate, ipg_pdf;
 
-        if (mx27_revision() >= CHIP_REV_2_0)
+        if (mx27_revision() >= IMX_CHIP_REVISION_2_0)
                 return clk_get_rate(clk->parent);
         else
                 ipg_pdf = (__raw_readl(CCM_CSCR) >> 8) & 1;
@@ -683,7 +683,7 @@ static void __init to2_adjust_clocks(void)
 {
         unsigned long cscr = __raw_readl(CCM_CSCR);
 
-        if (mx27_revision() >= CHIP_REV_2_0) {
+        if (mx27_revision() >= IMX_CHIP_REVISION_2_0) {
                 if (cscr & CCM_CSCR_ARM_SRC)
                         cpu_clk.parent = &mpll_main1_clk;
 
diff --git a/arch/arm/mach-imx/cpu-imx27.c b/arch/arm/mach-imx/cpu-imx27.c
index d8d3b2d84dc5..3b117be37bd2 100644
--- a/arch/arm/mach-imx/cpu-imx27.c
+++ b/arch/arm/mach-imx/cpu-imx27.c
@@ -42,7 +42,19 @@ static void query_silicon_parameter(void)
         val = __raw_readl(MX27_IO_ADDRESS(MX27_SYSCTRL_BASE_ADDR
                                 + SYS_CHIP_ID));
 
-        cpu_silicon_rev = (int)(val >> 28);
+        switch (val >> 28) {
+        case 0:
+                cpu_silicon_rev = IMX_CHIP_REVISION_1_0;
+                break;
+        case 1:
+                cpu_silicon_rev = IMX_CHIP_REVISION_2_0;
+                break;
+        case 2:
+                cpu_silicon_rev = IMX_CHIP_REVISION_2_1;
+                break;
+        default:
+                cpu_silicon_rev = IMX_CHIP_REVISION_UNKNOWN;
+        }
         cpu_partnumber = (int)((val >> 12) & 0xFFFF);
 }
 
diff --git a/arch/arm/mach-mx3/clock-imx31.c b/arch/arm/mach-mx3/clock-imx31.c
index 109e98f323e0..7cf6d29f376b 100644
--- a/arch/arm/mach-mx3/clock-imx31.c
+++ b/arch/arm/mach-mx3/clock-imx31.c
@@ -615,7 +615,7 @@ int __init mx31_clocks_init(unsigned long fref)
 
         mx31_read_cpu_rev();
 
-        if (mx31_revision() >= MX31_CHIP_REV_2_0) {
+        if (mx31_revision() >= IMX_CHIP_REVISION_2_0) {
                 reg = __raw_readl(MXC_CCM_PMCR1);
                 /* No PLL restart on DVFS switch; enable auto EMI handshake */
                 reg |= MXC_CCM_PMCR1_PLLRDIS | MXC_CCM_PMCR1_EMIRQ_EN;
diff --git a/arch/arm/mach-mx3/cpu.c b/arch/arm/mach-mx3/cpu.c
index d00a75457812..d1d339576fdf 100644
--- a/arch/arm/mach-mx3/cpu.c
+++ b/arch/arm/mach-mx3/cpu.c
@@ -25,15 +25,15 @@ struct mx3_cpu_type {
 };
 
 static struct mx3_cpu_type mx31_cpu_type[] __initdata = {
-        { .srev = 0x00, .name = "i.MX31(L)", .v = "1.0",  .rev = MX3x_CHIP_REV_1_0 },
-        { .srev = 0x10, .name = "i.MX31",    .v = "1.1",  .rev = MX3x_CHIP_REV_1_1 },
-        { .srev = 0x11, .name = "i.MX31L",   .v = "1.1",  .rev = MX3x_CHIP_REV_1_1 },
-        { .srev = 0x12, .name = "i.MX31",    .v = "1.15", .rev = MX3x_CHIP_REV_1_1 },
-        { .srev = 0x13, .name = "i.MX31L",   .v = "1.15", .rev = MX3x_CHIP_REV_1_1 },
-        { .srev = 0x14, .name = "i.MX31",    .v = "1.2",  .rev = MX3x_CHIP_REV_1_2 },
-        { .srev = 0x15, .name = "i.MX31L",   .v = "1.2",  .rev = MX3x_CHIP_REV_1_2 },
-        { .srev = 0x28, .name = "i.MX31",    .v = "2.0",  .rev = MX3x_CHIP_REV_2_0 },
-        { .srev = 0x29, .name = "i.MX31L",   .v = "2.0",  .rev = MX3x_CHIP_REV_2_0 },
+        { .srev = 0x00, .name = "i.MX31(L)", .v = "1.0",  .rev = IMX_CHIP_REVISION_1_0  },
+        { .srev = 0x10, .name = "i.MX31",    .v = "1.1",  .rev = IMX_CHIP_REVISION_1_1  },
+        { .srev = 0x11, .name = "i.MX31L",   .v = "1.1",  .rev = IMX_CHIP_REVISION_1_1  },
+        { .srev = 0x12, .name = "i.MX31",    .v = "1.15", .rev = IMX_CHIP_REVISION_1_1  },
+        { .srev = 0x13, .name = "i.MX31L",   .v = "1.15", .rev = IMX_CHIP_REVISION_1_1  },
+        { .srev = 0x14, .name = "i.MX31",    .v = "1.2",  .rev = IMX_CHIP_REVISION_1_2  },
+        { .srev = 0x15, .name = "i.MX31L",   .v = "1.2",  .rev = IMX_CHIP_REVISION_1_2  },
+        { .srev = 0x28, .name = "i.MX31",    .v = "2.0",  .rev = IMX_CHIP_REVISION_2_0  },
+        { .srev = 0x29, .name = "i.MX31L",   .v = "2.0",  .rev = IMX_CHIP_REVISION_2_0  },
 };
 
 void __init mx31_read_cpu_rev(void)
@@ -53,6 +53,8 @@ void __init mx31_read_cpu_rev(void)
                         return;
                 }
 
+        mx31_cpu_rev = IMX_CHIP_REVISION_UNKNOWN;
+
         printk(KERN_WARNING "Unknown CPU identifier. srev = %02x\n", srev);
 }
 
@@ -62,22 +64,25 @@ EXPORT_SYMBOL(mx35_cpu_rev);
 void __init mx35_read_cpu_rev(void)
 {
         u32 rev;
-        char *srev = "unknown";
+        char *srev;
 
         rev = __raw_readl(MX35_IO_ADDRESS(MX35_IIM_BASE_ADDR + MXC_IIMSREV));
         switch (rev) {
         case 0x00:
-                mx35_cpu_rev = MX3x_CHIP_REV_1_0;
+                mx35_cpu_rev = IMX_CHIP_REVISION_1_0;
                 srev = "1.0";
                 break;
         case 0x10:
-                mx35_cpu_rev = MX3x_CHIP_REV_2_0;
+                mx35_cpu_rev = IMX_CHIP_REVISION_2_0;
                 srev = "2.0";
                 break;
         case 0x11:
-                mx35_cpu_rev = MX3x_CHIP_REV_2_1;
+                mx35_cpu_rev = IMX_CHIP_REVISION_2_1;
                 srev = "2.1";
                 break;
+        default:
+                mx35_cpu_rev = IMX_CHIP_REVISION_UNKNOWN;
+                srev = "unknown";
         }
 
         printk(KERN_INFO "CPU identified as i.MX35, silicon rev %s\n", srev);
diff --git a/arch/arm/mach-mx5/clock-mx51-mx53.c b/arch/arm/mach-mx5/clock-mx51-mx53.c
index ca4f9d58cfeb..344ee8ef1eef 100644
--- a/arch/arm/mach-mx5/clock-mx51-mx53.c
+++ b/arch/arm/mach-mx5/clock-mx51-mx53.c
@@ -780,6 +780,12 @@ static struct clk ahb_clk = {
         .round_rate = _clk_ahb_round_rate,
 };
 
+static struct clk iim_clk = {
+        .parent = &ipg_clk,
+        .enable_reg = MXC_CCM_CCGR0,
+        .enable_shift = MXC_CCM_CCGRx_CG15_OFFSET,
+};
+
 /* Main IP interface clock for access to registers */
 static struct clk ipg_clk = {
         .parent = &ahb_clk,
@@ -1099,6 +1105,7 @@ static struct clk_lookup mx51_lookups[] = {
         _REGISTER_CLOCK("sdhci-esdhc-imx.0", NULL, esdhc1_clk)
         _REGISTER_CLOCK("sdhci-esdhc-imx.1", NULL, esdhc2_clk)
         _REGISTER_CLOCK(NULL, "cpu_clk", cpu_clk)
+        _REGISTER_CLOCK(NULL, "iim_clk", iim_clk)
 };
 
 static struct clk_lookup mx53_lookups[] = {
@@ -1107,6 +1114,7 @@ static struct clk_lookup mx53_lookups[] = {
         _REGISTER_CLOCK("imx-uart.2", NULL, uart3_clk)
         _REGISTER_CLOCK(NULL, "gpt", gpt_clk)
         _REGISTER_CLOCK("fec.0", NULL, fec_clk)
+        _REGISTER_CLOCK(NULL, "iim_clk", iim_clk)
 };
 
 static void clk_tree_init(void)
@@ -1147,6 +1155,10 @@ int __init mx51_clocks_init(unsigned long ckil, unsigned long osc,
         clk_enable(&cpu_clk);
         clk_enable(&main_bus_clk);
 
+        clk_enable(&iim_clk);
+        mx51_revision();
+        clk_disable(&iim_clk);
+
         /* set the usboh3_clk parent to pll2_sw_clk */
         clk_set_parent(&usboh3_clk, &pll2_sw_clk);
 
@@ -1182,6 +1194,10 @@ int __init mx53_clocks_init(unsigned long ckil, unsigned long osc,
         clk_enable(&cpu_clk);
         clk_enable(&main_bus_clk);
 
+        clk_enable(&iim_clk);
+        mx53_revision();
+        clk_disable(&iim_clk);
+
         /* System timer */
         mxc_timer_init(&gpt_clk, MX53_IO_ADDRESS(MX53_GPT1_BASE_ADDR),
                 MX53_INT_GPT);
diff --git a/arch/arm/mach-mx5/cpu.c b/arch/arm/mach-mx5/cpu.c
index a00d2bc7246a..d40671da4372 100644
--- a/arch/arm/mach-mx5/cpu.c
+++ b/arch/arm/mach-mx5/cpu.c
@@ -20,37 +20,18 @@
 
 static int cpu_silicon_rev = -1;
 
-#define SI_REV 0x48
+#define IIM_SREV 0x24
 
-static void query_silicon_parameter(void)
+static int get_mx51_srev(void)
 {
-        void __iomem *rom = ioremap(MX51_IROM_BASE_ADDR, MX51_IROM_SIZE);
-        u32 rev;
+        void __iomem *iim_base = MX51_IO_ADDRESS(MX51_IIM_BASE_ADDR);
+        u32 rev = readl(iim_base + IIM_SREV) & 0xff;
 
-        if (!rom) {
-                cpu_silicon_rev = -EINVAL;
-                return;
-        }
-
-        rev = readl(rom + SI_REV);
-        switch (rev) {
-        case 0x1:
-                cpu_silicon_rev = MX51_CHIP_REV_1_0;
-                break;
-        case 0x2:
-                cpu_silicon_rev = MX51_CHIP_REV_1_1;
-                break;
-        case 0x10:
-                cpu_silicon_rev = MX51_CHIP_REV_2_0;
-                break;
-        case 0x20:
-                cpu_silicon_rev = MX51_CHIP_REV_3_0;
-                break;
-        default:
-                cpu_silicon_rev = 0;
-        }
-
-        iounmap(rom);
+        if (rev == 0x0)
+                return IMX_CHIP_REVISION_2_0;
+        else if (rev == 0x10)
+                return IMX_CHIP_REVISION_3_0;
+        return 0;
 }
 
 /*
@@ -64,7 +45,7 @@ int mx51_revision(void)
                 return -EINVAL;
 
         if (cpu_silicon_rev == -1)
-                query_silicon_parameter();
+                cpu_silicon_rev = get_mx51_srev();
 
         return cpu_silicon_rev;
 }
@@ -82,7 +63,7 @@ static int __init mx51_neon_fixup(void)
         if (!cpu_is_mx51())
                 return 0;
 
-        if (mx51_revision() < MX51_CHIP_REV_3_0 && (elf_hwcap & HWCAP_NEON)) {
+        if (mx51_revision() < IMX_CHIP_REVISION_3_0 && (elf_hwcap & HWCAP_NEON)) {
                 elf_hwcap &= ~HWCAP_NEON;
                 pr_info("Turning off NEON support, detected broken NEON implementation\n");
         }
@@ -92,6 +73,18 @@ static int __init mx51_neon_fixup(void)
 late_initcall(mx51_neon_fixup);
 #endif
 
+static int get_mx53_srev(void)
+{
+        void __iomem *iim_base = MX51_IO_ADDRESS(MX53_IIM_BASE_ADDR);
+        u32 rev = readl(iim_base + IIM_SREV) & 0xff;
+
+        if (rev == 0x0)
+                return IMX_CHIP_REVISION_1_0;
+        else if (rev == 0x10)
+                return IMX_CHIP_REVISION_2_0;
+        return 0;
+}
+
 /*
  * Returns:
  *      the silicon revision of the cpu
@@ -103,7 +96,7 @@ int mx53_revision(void)
                 return -EINVAL;
 
         if (cpu_silicon_rev == -1)
-                query_silicon_parameter();
+                cpu_silicon_rev = get_mx53_srev();
 
         return cpu_silicon_rev;
 }
diff --git a/arch/arm/mach-mx5/mm.c b/arch/arm/mach-mx5/mm.c
index cbaf282fb818..e57f96858f0d 100644
--- a/arch/arm/mach-mx5/mm.c
+++ b/arch/arm/mach-mx5/mm.c
@@ -68,7 +68,7 @@ void __init mx51_init_irq(void)
         unsigned long tzic_addr;
         void __iomem *tzic_virt;
 
-        if (mx51_revision() < MX51_CHIP_REV_2_0)
+        if (mx51_revision() < IMX_CHIP_REVISION_2_0)
                 tzic_addr = MX51_TZIC_BASE_ADDR_TO1;
         else
                 tzic_addr = MX51_TZIC_BASE_ADDR;
diff --git a/arch/arm/plat-mxc/include/mach/mx27.h b/arch/arm/plat-mxc/include/mach/mx27.h
index eb09ec09dbe5..cbc43ad5ef48 100644
--- a/arch/arm/plat-mxc/include/mach/mx27.h
+++ b/arch/arm/plat-mxc/include/mach/mx27.h
@@ -244,10 +244,6 @@ static inline void mx27_setup_weimcs(size_t cs,
 #define MX27_DMA_REQ_SDHC3      36
 #define MX27_DMA_REQ_NFC        37
 
-/* silicon revisions specific to i.MX27 */
-#define CHIP_REV_1_0            0x00
-#define CHIP_REV_2_0            0x01
-
 #ifndef __ASSEMBLY__
 extern int mx27_revision(void);
 #endif
diff --git a/arch/arm/plat-mxc/include/mach/mx31.h b/arch/arm/plat-mxc/include/mach/mx31.h
index 092323144e2b..79e7fc01bb59 100644
--- a/arch/arm/plat-mxc/include/mach/mx31.h
+++ b/arch/arm/plat-mxc/include/mach/mx31.h
@@ -203,20 +203,4 @@ static inline void mx31_setup_weimcs(size_t cs,
 
 #define MX31_PROD_SIGNATURE             0x1     /* For MX31 */
 
-/* silicon revisions specific to i.MX31 */
-#define MX31_CHIP_REV_1_0               0x10
-#define MX31_CHIP_REV_1_1               0x11
-#define MX31_CHIP_REV_1_2               0x12
-#define MX31_CHIP_REV_1_3               0x13
-#define MX31_CHIP_REV_2_0               0x20
-#define MX31_CHIP_REV_2_1               0x21
-#define MX31_CHIP_REV_2_2               0x22
-#define MX31_CHIP_REV_2_3               0x23
-#define MX31_CHIP_REV_3_0               0x30
-#define MX31_CHIP_REV_3_1               0x31
-#define MX31_CHIP_REV_3_2               0x32
-
-#define MX31_SYSTEM_REV_MIN             MX31_CHIP_REV_1_0
-#define MX31_SYSTEM_REV_NUM             3
-
 #endif /* ifndef __MACH_MX31_H__ */
diff --git a/arch/arm/plat-mxc/include/mach/mx35.h b/arch/arm/plat-mxc/include/mach/mx35.h
index 0fa3f6855349..d13dbfeef08a 100644
--- a/arch/arm/plat-mxc/include/mach/mx35.h
+++ b/arch/arm/plat-mxc/include/mach/mx35.h
@@ -186,7 +186,4 @@
 
 #define MX35_PROD_SIGNATURE             0x1     /* For MX31 */
 
-#define MX35_SYSTEM_REV_MIN             MX3x_CHIP_REV_1_0
-#define MX35_SYSTEM_REV_NUM             3
-
 #endif /* ifndef __MACH_MX35_H__ */
diff --git a/arch/arm/plat-mxc/include/mach/mx3x.h b/arch/arm/plat-mxc/include/mach/mx3x.h
index 8c7f34e737d0..388a407d72d6 100644
--- a/arch/arm/plat-mxc/include/mach/mx3x.h
+++ b/arch/arm/plat-mxc/include/mach/mx3x.h
@@ -184,22 +184,6 @@
 
 #define MX3x_PROD_SIGNATURE             0x1     /* For MX31 */
 
-/* silicon revisions specific to i.MX31 and i.MX35 */
-#define MX3x_CHIP_REV_1_0               0x10
-#define MX3x_CHIP_REV_1_1               0x11
-#define MX3x_CHIP_REV_1_2               0x12
-#define MX3x_CHIP_REV_1_3               0x13
-#define MX3x_CHIP_REV_2_0               0x20
-#define MX3x_CHIP_REV_2_1               0x21
-#define MX3x_CHIP_REV_2_2               0x22
-#define MX3x_CHIP_REV_2_3               0x23
-#define MX3x_CHIP_REV_3_0               0x30
-#define MX3x_CHIP_REV_3_1               0x31
-#define MX3x_CHIP_REV_3_2               0x32
-
-#define MX3x_SYSTEM_REV_MIN             MX3x_CHIP_REV_1_0
-#define MX3x_SYSTEM_REV_NUM             3
-
 /* Mandatory defines used globally */
 
 #if !defined(__ASSEMBLY__) && !defined(__MXC_BOOT_UNCOMPRESS)
diff --git a/arch/arm/plat-mxc/include/mach/mx51.h b/arch/arm/plat-mxc/include/mach/mx51.h
index 636347c3fa88..8fddfef9b4e8 100644
--- a/arch/arm/plat-mxc/include/mach/mx51.h
+++ b/arch/arm/plat-mxc/include/mach/mx51.h
@@ -345,19 +345,6 @@
 #define MX51_MXC_INT_EMI_NFC            101
 #define MX51_MXC_INT_GPU_IDLE           102
 
-/* silicon revisions specific to i.MX51 */
-#define MX51_CHIP_REV_1_0               0x10
-#define MX51_CHIP_REV_1_1               0x11
-#define MX51_CHIP_REV_1_2               0x12
-#define MX51_CHIP_REV_1_3               0x13
-#define MX51_CHIP_REV_2_0               0x20
-#define MX51_CHIP_REV_2_1               0x21
-#define MX51_CHIP_REV_2_2               0x22
-#define MX51_CHIP_REV_2_3               0x23
-#define MX51_CHIP_REV_3_0               0x30
-#define MX51_CHIP_REV_3_1               0x31
-#define MX51_CHIP_REV_3_2               0x32
-
 #if !defined(__ASSEMBLY__) && !defined(__MXC_BOOT_UNCOMPRESS)
 extern int mx51_revision(void);
 #endif
diff --git a/arch/arm/plat-mxc/include/mach/mxc.h b/arch/arm/plat-mxc/include/mach/mxc.h
index 4c17515650b8..4abbdd11d5c6 100644
--- a/arch/arm/plat-mxc/include/mach/mxc.h
+++ b/arch/arm/plat-mxc/include/mach/mxc.h
@@ -36,6 +36,20 @@
 #define MXC_CPU_MX53            53
 #define MXC_CPU_MXC91231        91231
 
+#define IMX_CHIP_REVISION_1_0           0x10
+#define IMX_CHIP_REVISION_1_1           0x11
+#define IMX_CHIP_REVISION_1_2           0x12
+#define IMX_CHIP_REVISION_1_3           0x13
+#define IMX_CHIP_REVISION_2_0           0x20
+#define IMX_CHIP_REVISION_2_1           0x21
+#define IMX_CHIP_REVISION_2_2           0x22
+#define IMX_CHIP_REVISION_2_3           0x23
+#define IMX_CHIP_REVISION_3_0           0x30
+#define IMX_CHIP_REVISION_3_1           0x31
+#define IMX_CHIP_REVISION_3_2           0x32
+#define IMX_CHIP_REVISION_3_3           0x33
+#define IMX_CHIP_REVISION_UNKNOWN       0xff
+
 #ifndef __ASSEMBLY__
 extern unsigned int __mxc_cpu_type;
 #endif