Merge tag 'v2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[mv-sheeva.git] / arch / arm / mach-ux500 / id.c

diff --git a/arch/arm/mach-ux500/id.c b/arch/arm/mach-ux500/id.c
new file mode 100644 (file)
index 0000000..d35122e
--- /dev/null
+++ b/arch/arm/mach-ux500/id.c
@@ -0,0 +1,107 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
+ * License terms: GNU General Public License (GPL) version 2
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+
+#include <asm/cputype.h>
+#include <asm/tlbflush.h>
+#include <asm/cacheflush.h>
+#include <asm/mach/map.h>
+
+#include <mach/hardware.h>
+#include <mach/setup.h>
+
+struct dbx500_asic_id dbx500_id;
+
+static unsigned int ux500_read_asicid(phys_addr_t addr)
+{
+       phys_addr_t base = addr & ~0xfff;
+       struct map_desc desc = {
+               .virtual        = IO_ADDRESS(base),
+               .pfn            = __phys_to_pfn(base),
+               .length         = SZ_16K,
+               .type           = MT_DEVICE,
+       };
+
+       iotable_init(&desc, 1);
+
+       /* As in devicemaps_init() */
+       local_flush_tlb_all();
+       flush_cache_all();
+
+       return readl(__io_address(addr));
+}
+
+static void ux500_print_soc_info(unsigned int asicid)
+{
+       unsigned int rev = dbx500_revision();
+
+       pr_info("DB%4x ", dbx500_partnumber());
+
+       if (rev == 0x01)
+               pr_cont("Early Drop");
+       else if (rev >= 0xA0)
+               pr_cont("v%d.%d" , (rev >> 4) - 0xA + 1, rev & 0xf);
+       else
+               pr_cont("Unknown");
+
+       pr_cont(" [%#010x]\n", asicid);
+}
+
+static unsigned int partnumber(unsigned int asicid)
+{
+       return (asicid >> 8) & 0xffff;
+}
+
+/*
+ * SOC         MIDR            ASICID ADDRESS          ASICID VALUE
+ * DB8500ed    0x410fc090      0x9001FFF4              0x00850001
+ * DB8500v1    0x411fc091      0x9001FFF4              0x008500A0
+ * DB8500v1.1  0x411fc091      0x9001FFF4              0x008500A1
+ * DB8500v2    0x412fc091      0x9001DBF4              0x008500B0
+ * DB5500v1    0x412fc091      0x9001FFF4              0x005500A0
+ */
+
+void __init ux500_map_io(void)
+{
+       unsigned int cpuid = read_cpuid_id();
+       unsigned int asicid = 0;
+       phys_addr_t addr = 0;
+
+       switch (cpuid) {
+       case 0x410fc090: /* DB8500ed */
+       case 0x411fc091: /* DB8500v1 */
+               addr = 0x9001FFF4;
+               break;
+
+       case 0x412fc091: /* DB8500v2 / DB5500v1 */
+               asicid = ux500_read_asicid(0x9001DBF4);
+               if (partnumber(asicid) == 0x8500)
+                       /* DB8500v2 */
+                       break;
+
+               /* DB5500v1 */
+               addr = 0x9001FFF4;
+               break;
+       }
+
+       if (addr)
+               asicid = ux500_read_asicid(addr);
+
+       if (!asicid) {
+               pr_err("Unable to identify SoC\n");
+               ux500_unknown_soc();
+       }
+
+       dbx500_id.process = asicid >> 24;
+       dbx500_id.partnumber = partnumber(asicid);
+       dbx500_id.revision = asicid & 0xff;
+
+       ux500_print_soc_info(asicid);
+}