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>

3 files changed, 41 insertions, 32 deletions

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;