ux500: dynamic SOC detection

Dynamically detect the DBx500 SOC an revision based on the ASIC ID.

Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>

1 files changed, 10 insertions, 81 deletions

diff --git a/arch/arm/mach-ux500/cpu-db8500.c b/arch/arm/mach-ux500/cpu-db8500.c
index 1b2b81c0f27..1748fbc5853 100644
--- a/arch/arm/mach-ux500/cpu-db8500.c
+++ b/arch/arm/mach-ux500/cpu-db8500.c
@@ -29,9 +29,12 @@ static struct platform_device *platform_devs[] __initdata = {
 };
 
 /* minimum static i/o mapping required to boot U8500 platforms */
-static struct map_desc u8500_io_desc[] __initdata = {
+static struct map_desc u8500_uart_io_desc[] __initdata = {
         __IO_DEV_DESC(U8500_UART0_BASE, SZ_4K),
         __IO_DEV_DESC(U8500_UART2_BASE, SZ_4K),
+};
+
+static struct map_desc u8500_io_desc[] __initdata = {
         __IO_DEV_DESC(U8500_GIC_CPU_BASE, SZ_4K),
         __IO_DEV_DESC(U8500_GIC_DIST_BASE, SZ_4K),
         __IO_DEV_DESC(U8500_L2CC_BASE, SZ_4K),
@@ -51,7 +54,6 @@ static struct map_desc u8500_io_desc[] __initdata = {
         __IO_DEV_DESC(U8500_GPIO1_BASE, SZ_4K),
         __IO_DEV_DESC(U8500_GPIO2_BASE, SZ_4K),
         __IO_DEV_DESC(U8500_GPIO3_BASE, SZ_4K),
-        __MEM_DEV_DESC(U8500_BOOT_ROM_BASE, SZ_1M),
 };
 
 static struct map_desc u8500_ed_io_desc[] __initdata = {
@@ -68,71 +70,15 @@ static struct map_desc u8500_v2_io_desc[] __initdata = {
         __IO_DEV_DESC(U8500_PRCMU_TCDM_BASE, SZ_4K),
 };
 
-/*
- * Functions to differentiate between later ASICs
- * We look into the end of the ROM to locate the hardcoded ASIC ID.
- * This is only needed to differentiate between minor revisions and
- * process variants of an ASIC, the major revisions are encoded in
- * the cpuid.
- */
-#define U8500_ASIC_ID_LOC_ED_V1 (U8500_BOOT_ROM_BASE + 0x1FFF4)
-#define U8500_ASIC_ID_LOC_V2    (U8500_BOOT_ROM_BASE + 0x1DBF4)
-#define U8500_ASIC_REV_ED       0x01
-#define U8500_ASIC_REV_V10      0xA0
-#define U8500_ASIC_REV_V11      0xA1
-#define U8500_ASIC_REV_V20      0xB0
-
-/**
- * struct db8500_asic_id - fields of the ASIC ID
- * @process: the manufacturing process, 0x40 is 40 nm
- *  0x00 is "standard"
- * @partnumber: hithereto 0x8500 for DB8500
- * @revision: version code in the series
- * This field definion is not formally defined but makes
- * sense.
- */
-struct db8500_asic_id {
-        u8 process;
-        u16 partnumber;
-        u8 revision;
-};
-
-/* This isn't going to change at runtime */
-static struct db8500_asic_id db8500_id;
-
-static void __init get_db8500_asic_id(void)
-{
-        u32 asicid;
-
-        if (cpu_is_u8500v1() || cpu_is_u8500ed())
-                asicid = readl(__io_address(U8500_ASIC_ID_LOC_ED_V1));
-        else if (cpu_is_u8500v2())
-                asicid = readl(__io_address(U8500_ASIC_ID_LOC_V2));
-        else
-                BUG();
-
-        db8500_id.process = (asicid >> 24);
-        db8500_id.partnumber = (asicid >> 16) & 0xFFFFU;
-        db8500_id.revision = asicid & 0xFFU;
-}
-
-bool cpu_is_u8500v10(void)
-{
-        return (db8500_id.revision == U8500_ASIC_REV_V10);
-}
-
-bool cpu_is_u8500v11(void)
+void __init u8500_map_io(void)
 {
-        return (db8500_id.revision == U8500_ASIC_REV_V11);
-}
+        /*
+         * Map the UARTs early so that the DEBUG_LL stuff continues to work.
+         */
+        iotable_init(u8500_uart_io_desc, ARRAY_SIZE(u8500_uart_io_desc));
 
-bool cpu_is_u8500v20(void)
-{
-        return (db8500_id.revision == U8500_ASIC_REV_V20);
-}
+        ux500_map_io();
 
-void __init u8500_map_io(void)
-{
         iotable_init(u8500_io_desc, ARRAY_SIZE(u8500_io_desc));
 
         if (cpu_is_u8500ed())
@@ -141,9 +87,6 @@ void __init u8500_map_io(void)
                 iotable_init(u8500_v1_io_desc, ARRAY_SIZE(u8500_v1_io_desc));
         else if (cpu_is_u8500v2())
                 iotable_init(u8500_v2_io_desc, ARRAY_SIZE(u8500_v2_io_desc));
-
-        /* Read out the ASIC ID as early as we can */
-        get_db8500_asic_id();
 }
 
 static resource_size_t __initdata db8500_gpio_base[] = {
@@ -173,20 +116,6 @@ static void __init db8500_add_gpios(void)
  */
 void __init u8500_init_devices(void)
 {
-        /* Display some ASIC boilerplate */
-        pr_info("DB8500: process: %02x, revision ID: 0x%02x\n",
-                db8500_id.process, db8500_id.revision);
-        if (cpu_is_u8500ed())
-                pr_info("DB8500: Early Drop (ED)\n");
-        else if (cpu_is_u8500v10())
-                pr_info("DB8500: version 1.0\n");
-        else if (cpu_is_u8500v11())
-                pr_info("DB8500: version 1.1\n");
-        else if (cpu_is_u8500v20())
-                pr_info("DB8500: version 2.0\n");
-        else
-                pr_warning("ASIC: UNKNOWN SILICON VERSION!\n");
-
         if (cpu_is_u8500ed())
                 dma40_u8500ed_fixup();