1 files changed, 151 insertions, 0 deletions

diff --git a/arch/arm/mach-imx/cpu-imx5.c b/arch/arm/mach-imx/cpu-imx5.c
new file mode 100644
index 000000000000..aa15c517d06e
--- /dev/null
+++ b/arch/arm/mach-imx/cpu-imx5.c
@@ -0,0 +1,151 @@
+/*
+ * Copyright 2008-2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * This file contains the CPU initialization code.
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <mach/hardware.h>
+#include <linux/io.h>
+
+static int mx5_cpu_rev = -1;
+
+#define IIM_SREV 0x24
+#define MX50_HW_ADADIG_DIGPROG  0xB0
+
+static int get_mx51_srev(void)
+{
+        void __iomem *iim_base = MX51_IO_ADDRESS(MX51_IIM_BASE_ADDR);
+        u32 rev = readl(iim_base + IIM_SREV) & 0xff;
+
+        switch (rev) {
+        case 0x0:
+                return IMX_CHIP_REVISION_2_0;
+        case 0x10:
+                return IMX_CHIP_REVISION_3_0;
+        default:
+                return IMX_CHIP_REVISION_UNKNOWN;
+        }
+}
+
+/*
+ * Returns:
+ *      the silicon revision of the cpu
+ *      -EINVAL - not a mx51
+ */
+int mx51_revision(void)
+{
+        if (!cpu_is_mx51())
+                return -EINVAL;
+
+        if (mx5_cpu_rev == -1)
+                mx5_cpu_rev = get_mx51_srev();
+
+        return mx5_cpu_rev;
+}
+EXPORT_SYMBOL(mx51_revision);
+
+#ifdef CONFIG_NEON
+
+/*
+ * All versions of the silicon before Rev. 3 have broken NEON implementations.
+ * Dependent on link order - so the assumption is that vfp_init is called
+ * before us.
+ */
+static int __init mx51_neon_fixup(void)
+{
+        if (!cpu_is_mx51())
+                return 0;
+
+        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");
+        }
+        return 0;
+}
+
+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;
+
+        switch (rev) {
+        case 0x0:
+                return IMX_CHIP_REVISION_1_0;
+        case 0x2:
+                return IMX_CHIP_REVISION_2_0;
+        case 0x3:
+                return IMX_CHIP_REVISION_2_1;
+        default:
+                return IMX_CHIP_REVISION_UNKNOWN;
+        }
+}
+
+/*
+ * Returns:
+ *      the silicon revision of the cpu
+ *      -EINVAL - not a mx53
+ */
+int mx53_revision(void)
+{
+        if (!cpu_is_mx53())
+                return -EINVAL;
+
+        if (mx5_cpu_rev == -1)
+                mx5_cpu_rev = get_mx53_srev();
+
+        return mx5_cpu_rev;
+}
+EXPORT_SYMBOL(mx53_revision);
+
+static int get_mx50_srev(void)
+{
+        void __iomem *anatop = ioremap(MX50_ANATOP_BASE_ADDR, SZ_8K);
+        u32 rev;
+
+        if (!anatop) {
+                mx5_cpu_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 (mx5_cpu_rev == -1)
+                mx5_cpu_rev = get_mx50_srev();
+
+        return mx5_cpu_rev;
+}
+EXPORT_SYMBOL(mx50_revision);