ARM: OMAP: Add OMAP chip type structure; clean up mach-omap2/id.c

Add a new OMAP chip identification interface, omap_chip_id.
omap_chip_id is a structure which contains one bit for each OMAP2/3
CPU type, and on 3430, ES level.  For example, the CHIP_IS_OMAP2420
bit is set in omap_chip at boot on an OMAP2420.  On OMAP3430ES2, both
CHIP_IS_OMAP3430 and CHIP_IS_OMAP3430ES2 bits are set.

omap_chip is set in mach-omap2/id.c by _set_omap_chip(). Other
code should use the omap_chip_is() function to test against omap_chip.

Also, clean up id.c by splitting some code out of
omap_check_revision() into its own function, _set_system_rev(); and
converting some debug printk()s into pr_debug().

Second revision.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 168 insertions, 27 deletions

diff --git a/arch/arm/mach-omap2/id.c b/arch/arm/mach-omap2/id.c
index 4dfd878d7968..dff4b16cead6 100644
--- a/arch/arm/mach-omap2/id.c
+++ b/arch/arm/mach-omap2/id.c
@@ -17,16 +17,23 @@
 
 #include <asm/io.h>
 
-#if defined(CONFIG_ARCH_OMAP2420)
-#define OMAP24XX_TAP_BASE       io_p2v(0x48014000)
-#endif
+#include <asm/arch/control.h>
+#include <asm/arch/cpu.h>
 
-#if defined(CONFIG_ARCH_OMAP2430)
-#define OMAP24XX_TAP_BASE       io_p2v(0x4900A000)
+#if defined(CONFIG_ARCH_OMAP2420)
+#define TAP_BASE        io_p2v(0x48014000)
+#elif defined(CONFIG_ARCH_OMAP2430)
+#define TAP_BASE        io_p2v(0x4900A000)
+#elif defined(CONFIG_ARCH_OMAP34XX)
+#define TAP_BASE        io_p2v(0x4830A000)
 #endif
 
 #define OMAP_TAP_IDCODE         0x0204
+#if defined(CONFIG_ARCH_OMAP34XX)
+#define OMAP_TAP_PROD_ID        0x0210
+#else
 #define OMAP_TAP_PROD_ID        0x0208
+#endif
 
 #define OMAP_TAP_DIE_ID_0       0x0218
 #define OMAP_TAP_DIE_ID_1       0x021C
@@ -56,9 +63,134 @@ static struct omap_id omap_ids[] __initdata = {
         { .hawkeye = 0xb68a, .dev = 0x0, .type = 0x24300000 },
 };
 
+static struct omap_chip_id omap_chip;
+
+/**
+ * omap_chip_is - test whether currently running OMAP matches a chip type
+ * @oc: omap_chip_t to test against
+ *
+ * Test whether the currently-running OMAP chip matches the supplied
+ * chip type 'oc'.  Returns 1 upon a match; 0 upon failure.
+ */
+int omap_chip_is(struct omap_chip_id oci)
+{
+        return (oci.oc & omap_chip.oc) ? 1 : 0;
+}
+EXPORT_SYMBOL(omap_chip_is);
+
 static u32 __init read_tap_reg(int reg)
 {
-        return __raw_readl(OMAP24XX_TAP_BASE + reg);
+        unsigned int regval = 0;
+        u32 cpuid;
+
+        /* Reading the IDCODE register on 3430 ES1 results in a
+         * data abort as the register is not exposed on the OCP
+         * Hence reading the Cortex Rev
+         */
+        cpuid = read_cpuid(CPUID_ID);
+
+        /* If the processor type is Cortex-A8 and the revision is 0x0
+         * it means its Cortex r0p0 which is 3430 ES1
+         */
+        if ((((cpuid >> 4) & 0xFFF) == 0xC08) && ((cpuid & 0xF) == 0x0)) {
+                switch (reg) {
+                case OMAP_TAP_IDCODE  : regval = 0x0B7AE02F; break;
+                /* Making DevType as 0xF in ES1 to differ from ES2 */
+                case OMAP_TAP_PROD_ID : regval = 0x000F00F0; break;
+                case OMAP_TAP_DIE_ID_0: regval = 0x01000000; break;
+                case OMAP_TAP_DIE_ID_1: regval = 0x1012d687; break;
+                case OMAP_TAP_DIE_ID_2: regval = 0x00000000; break;
+                case OMAP_TAP_DIE_ID_3: regval = 0x2d2c0000; break;
+                }
+        } else
+                regval = __raw_readl(TAP_BASE + reg);
+
+        return regval;
+
+}
+
+/*
+ * _set_system_rev - set the system_rev global based on current OMAP chip type
+ *
+ * Set the system_rev global.  This is primarily used by the cpu_is_omapxxxx()
+ * macros.
+ */
+static void __init _set_system_rev(u32 type, u8 rev)
+{
+        u32 i, ctrl_status;
+
+        /*
+         * system_rev encoding is as follows
+         * system_rev & 0xff000000 -> Omap Class (24xx/34xx)
+         * system_rev & 0xfff00000 -> Omap Sub Class (242x/343x)
+         * system_rev & 0xffff0000 -> Omap type (2420/2422/2423/2430/3430)
+         * system_rev & 0x0000f000 -> Silicon revision (ES1, ES2 )
+         * system_rev & 0x00000700 -> Device Type ( EMU/HS/GP/BAD )
+         * system_rev & 0x000000c0 -> IDCODE revision[6:7]
+         * system_rev & 0x0000003f -> sys_boot[0:5]
+         */
+        /* Embedding the ES revision info in type field */
+        system_rev = type;
+        /* Also add IDCODE revision info only two lower bits */
+        system_rev |= ((rev & 0x3) << 6);
+
+        /* Add in the device type and sys_boot fields (see above) */
+        if (cpu_is_omap24xx()) {
+                i = OMAP24XX_CONTROL_STATUS;
+        } else if (cpu_is_omap343x()) {
+                i = OMAP343X_CONTROL_STATUS;
+        } else {
+                printk(KERN_ERR "id: unknown CPU type\n");
+                BUG();
+        }
+        ctrl_status = omap_ctrl_readl(i);
+        system_rev |= (ctrl_status & (OMAP2_SYSBOOT_5_MASK |
+                                      OMAP2_SYSBOOT_4_MASK |
+                                      OMAP2_SYSBOOT_3_MASK |
+                                      OMAP2_SYSBOOT_2_MASK |
+                                      OMAP2_SYSBOOT_1_MASK |
+                                      OMAP2_SYSBOOT_0_MASK));
+        system_rev |= (ctrl_status & OMAP2_DEVICETYPE_MASK);
+}
+
+
+/*
+ * _set_omap_chip - set the omap_chip global based on OMAP chip type
+ *
+ * Build the omap_chip bits.  This variable is used by powerdomain and
+ * clockdomain code to indicate whether structures are applicable for
+ * the current OMAP chip type by ANDing it against a 'platform' bitfield
+ * in the structure.
+ */
+static void __init _set_omap_chip(void)
+{
+        if (cpu_is_omap343x()) {
+
+                omap_chip.oc = CHIP_IS_OMAP3430;
+                if (is_sil_rev_equal_to(OMAP3430_REV_ES1_0))
+                        omap_chip.oc |= CHIP_IS_OMAP3430ES1;
+                else if (is_sil_rev_greater_than(OMAP3430_REV_ES1_0))
+                        omap_chip.oc |= CHIP_IS_OMAP3430ES2;
+
+        } else if (cpu_is_omap243x()) {
+
+                /* Currently only supports 2430ES2.1 and 2430-all */
+                omap_chip.oc |= CHIP_IS_OMAP2430;
+
+        } else if (cpu_is_omap242x()) {
+
+                /* Currently only supports 2420ES2.1.1 and 2420-all */
+                omap_chip.oc |= CHIP_IS_OMAP2420;
+
+        } else {
+
+                /* Current CPU not supported by this code. */
+                printk(KERN_WARNING "OMAP chip type code does not yet support "
+                       "this CPU type.\n");
+                WARN_ON(1);
+
+        }
+
 }
 
 void __init omap2_check_revision(void)
@@ -76,21 +208,31 @@ void __init omap2_check_revision(void)
         rev = (idcode >> 28) & 0x0f;
         dev_type = (prod_id >> 16) & 0x0f;
 
-#ifdef DEBUG
-        printk(KERN_DEBUG "OMAP_TAP_IDCODE 0x%08x REV %i HAWKEYE 0x%04x MANF %03x\n",
-                idcode, rev, hawkeye, (idcode >> 1) & 0x7ff);
-        printk(KERN_DEBUG "OMAP_TAP_DIE_ID_0: 0x%08x\n",
-                read_tap_reg(OMAP_TAP_DIE_ID_0));
-        printk(KERN_DEBUG "OMAP_TAP_DIE_ID_1: 0x%08x DEV_REV: %i\n",
-                read_tap_reg(OMAP_TAP_DIE_ID_1),
-               (read_tap_reg(OMAP_TAP_DIE_ID_1) >> 28) & 0xf);
-        printk(KERN_DEBUG "OMAP_TAP_DIE_ID_2: 0x%08x\n",
-                read_tap_reg(OMAP_TAP_DIE_ID_2));
-        printk(KERN_DEBUG "OMAP_TAP_DIE_ID_3: 0x%08x\n",
-                read_tap_reg(OMAP_TAP_DIE_ID_3));
-        printk(KERN_DEBUG "OMAP_TAP_PROD_ID_0: 0x%08x DEV_TYPE: %i\n",
-                prod_id, dev_type);
-#endif
+        pr_debug("OMAP_TAP_IDCODE 0x%08x REV %i HAWKEYE 0x%04x MANF %03x\n",
+                 idcode, rev, hawkeye, (idcode >> 1) & 0x7ff);
+        pr_debug("OMAP_TAP_DIE_ID_0: 0x%08x\n",
+                 read_tap_reg(OMAP_TAP_DIE_ID_0));
+        pr_debug("OMAP_TAP_DIE_ID_1: 0x%08x DEV_REV: %i\n",
+                 read_tap_reg(OMAP_TAP_DIE_ID_1),
+                 (read_tap_reg(OMAP_TAP_DIE_ID_1) >> 28) & 0xf);
+        pr_debug("OMAP_TAP_DIE_ID_2: 0x%08x\n",
+                 read_tap_reg(OMAP_TAP_DIE_ID_2));
+        pr_debug("OMAP_TAP_DIE_ID_3: 0x%08x\n",
+                 read_tap_reg(OMAP_TAP_DIE_ID_3));
+        pr_debug("OMAP_TAP_PROD_ID_0: 0x%08x DEV_TYPE: %i\n",
+                 prod_id, dev_type);
+
+        /*
+         * Detection for 34xx ES2.0 and above can be done with just
+         * hawkeye and rev. See TRM 1.5.2 Device Identification.
+         * Note that rev cannot be used directly as ES1.0 uses value 0.
+         */
+        if (hawkeye == 0xb7ae) {
+                system_rev = 0x34300000 | ((1 + rev) << 12);
+                pr_info("OMAP%04x ES2.%i\n", system_rev >> 16, rev);
+                _set_omap_chip();
+                return;
+        }
 
         /* Check hawkeye ids */
         for (i = 0; i < ARRAY_SIZE(omap_ids); i++) {
@@ -114,16 +256,15 @@ void __init omap2_check_revision(void)
                                 omap_ids[i].type >> 16);
                 j = i;
         }
-        system_rev = omap_ids[j].type;
 
-        system_rev |= rev << 8;
+        _set_system_rev(omap_ids[j].type, rev);
 
-        /* Add the cpu class info (24xx) */
-        system_rev |= 0x24;
+        _set_omap_chip();
 
         pr_info("OMAP%04x", system_rev >> 16);
         if ((system_rev >> 8) & 0x0f)
-                printk("%x", (system_rev >> 8) & 0x0f);
-        printk("\n");
+                pr_info("ES%x", (system_rev >> 12) & 0xf);
+        pr_info("\n");
+
 }