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ARM: OMAP2: Fix cpu detection
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At some point omap2 changed the bits for GET_OMAP_CLASS, which
broke 15xx detection on 730 as noticed by Russell King.

This patch fixes omap2 cpu detection to respect the original
GET_OMAP_CLASS, and simplifies the detection for 34xx.

Signed-off-by: Tony Lindgren <tony@atomide.com>
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Tony Lindgren committed Dec 11, 2008
1 parent 5ba02dc commit a882314
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Showing 4 changed files with 145 additions and 226 deletions.
3 changes: 0 additions & 3 deletions arch/arm/mach-omap1/id.c
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Original file line number Diff line number Diff line change
Expand Up @@ -178,9 +178,6 @@ void __init omap_check_revision(void)
case 0x17:
system_rev |= 0x16;
break;
case 0x24:
system_rev |= 0x24;
break;
default:
printk("Unknown OMAP cpu type: 0x%02x\n", cpu_type);
}
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2 changes: 1 addition & 1 deletion arch/arm/mach-omap2/clock34xx.c
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Original file line number Diff line number Diff line change
Expand Up @@ -475,7 +475,7 @@ int __init omap2_clk_init(void)
* Update this if there are further clock changes between ES2
* and production parts
*/
if (is_sil_rev_equal_to(OMAP3430_REV_ES1_0)) {
if (system_rev == OMAP3430_REV_ES1_0) {
/* No 3430ES1-only rates exist, so no RATE_IN_3430ES1 */
cpu_clkflg |= CLOCK_IN_OMAP3430ES1;
} else {
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290 changes: 119 additions & 171 deletions arch/arm/mach-omap2/id.c
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Original file line number Diff line number Diff line change
Expand Up @@ -22,39 +22,6 @@
#include <mach/control.h>
#include <mach/cpu.h>

static u32 class;
static void __iomem *tap_base;
static u16 tap_prod_id;

#define OMAP_TAP_IDCODE 0x0204
#define OMAP_TAP_DIE_ID_0 0x0218
#define OMAP_TAP_DIE_ID_1 0x021C
#define OMAP_TAP_DIE_ID_2 0x0220
#define OMAP_TAP_DIE_ID_3 0x0224

/* system_rev fields for OMAP2 processors:
* CPU id bits [31:16],
* CPU device type [15:12], (unprg,normal,POP)
* CPU revision [11:08]
* CPU class bits [07:00]
*/

struct omap_id {
u16 hawkeye; /* Silicon type (Hawkeye id) */
u8 dev; /* Device type from production_id reg */
u32 type; /* combined type id copied to system_rev */
};

/* Register values to detect the OMAP version */
static struct omap_id omap_ids[] __initdata = {
{ .hawkeye = 0xb5d9, .dev = 0x0, .type = 0x24200000 },
{ .hawkeye = 0xb5d9, .dev = 0x1, .type = 0x24201000 },
{ .hawkeye = 0xb5d9, .dev = 0x2, .type = 0x24202000 },
{ .hawkeye = 0xb5d9, .dev = 0x4, .type = 0x24220000 },
{ .hawkeye = 0xb5d9, .dev = 0x8, .type = 0x24230000 },
{ .hawkeye = 0xb68a, .dev = 0x0, .type = 0x24300000 },
};

static struct omap_chip_id omap_chip;

/**
Expand All @@ -70,135 +37,41 @@ int omap_chip_is(struct omap_chip_id oci)
}
EXPORT_SYMBOL(omap_chip_is);

static u32 __init read_tap_reg(int 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)) {

if (reg == tap_prod_id) {
regval = 0x000F00F0;
goto out;
}

switch (reg) {
case OMAP_TAP_IDCODE : regval = 0x0B7AE02F; break;
/* Making DevType as 0xF in ES1 to differ from ES2 */
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);

out:
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;
#define OMAP_TAP_IDCODE 0x0204
#define OMAP_TAP_DIE_ID_0 0x0218
#define OMAP_TAP_DIE_ID_1 0x021C
#define OMAP_TAP_DIE_ID_2 0x0220
#define OMAP_TAP_DIE_ID_3 0x0224

} else {
#define read_tap_reg(reg) __raw_readl(tap_base + (reg))

/* 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);
struct omap_id {
u16 hawkeye; /* Silicon type (Hawkeye id) */
u8 dev; /* Device type from production_id reg */
u32 type; /* Combined type id copied to system_rev */
};

}
/* Register values to detect the OMAP version */
static struct omap_id omap_ids[] __initdata = {
{ .hawkeye = 0xb5d9, .dev = 0x0, .type = 0x24200024 },
{ .hawkeye = 0xb5d9, .dev = 0x1, .type = 0x24201024 },
{ .hawkeye = 0xb5d9, .dev = 0x2, .type = 0x24202024 },
{ .hawkeye = 0xb5d9, .dev = 0x4, .type = 0x24220024 },
{ .hawkeye = 0xb5d9, .dev = 0x8, .type = 0x24230024 },
{ .hawkeye = 0xb68a, .dev = 0x0, .type = 0x24300024 },
};

}
static void __iomem *tap_base;
static u16 tap_prod_id;

void __init omap24xx_check_revision(void)
{
int i, j;
u32 idcode;
u32 prod_id;
u32 idcode, prod_id;
u16 hawkeye;
u8 dev_type;
u8 rev;
u8 dev_type, rev;

idcode = read_tap_reg(OMAP_TAP_IDCODE);
prod_id = read_tap_reg(tap_prod_id);
Expand All @@ -220,18 +93,6 @@ void __init omap24xx_check_revision(void)
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++) {
if (hawkeye == omap_ids[i].hawkeye)
Expand All @@ -255,28 +116,115 @@ void __init omap24xx_check_revision(void)
j = i;
}

_set_system_rev(omap_ids[j].type, rev);

_set_omap_chip();

pr_info("OMAP%04x", system_rev >> 16);
if ((system_rev >> 8) & 0x0f)
pr_info("ES%x", (system_rev >> 12) & 0xf);
pr_info("\n");
}

void __init omap34xx_check_revision(void)
{
u32 cpuid, idcode;
u16 hawkeye;
u8 rev;
char *rev_name = "ES1.0";

/*
* We cannot access revision registers on ES1.0.
* If the processor type is Cortex-A8 and the revision is 0x0
* it means its Cortex r0p0 which is 3430 ES1.0.
*/
cpuid = read_cpuid(CPUID_ID);
if ((((cpuid >> 4) & 0xfff) == 0xc08) && ((cpuid & 0xf) == 0x0)) {
system_rev = OMAP3430_REV_ES1_0;
goto out;
}

/*
* 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 does not map directly to our defined processor
* revision numbers as ES1.0 uses value 0.
*/
idcode = read_tap_reg(OMAP_TAP_IDCODE);
hawkeye = (idcode >> 12) & 0xffff;
rev = (idcode >> 28) & 0xff;

if (hawkeye == 0xb7ae) {
switch (rev) {
case 0:
system_rev = OMAP3430_REV_ES2_0;
rev_name = "ES2.0";
break;
case 2:
system_rev = OMAP3430_REV_ES2_1;
rev_name = "ES2.1";
break;
case 3:
system_rev = OMAP3430_REV_ES3_0;
rev_name = "ES3.0";
break;
default:
/* Use the latest known revision as default */
system_rev = OMAP3430_REV_ES3_0;
rev_name = "Unknown revision\n";
}
}

out:
pr_info("OMAP%04x %s\n", system_rev >> 16, rev_name);
}

/*
* Try to detect the exact revision of the omap we're running on
*/
void __init omap2_check_revision(void)
{
omap24xx_check_revision();
/*
* At this point we have an idea about the processor revision set
* earlier with omap2_set_globals_tap().
*/
if (cpu_is_omap24xx())
omap24xx_check_revision();
else if (cpu_is_omap34xx())
omap34xx_check_revision();
else
pr_err("OMAP revision unknown, please fix!\n");

/*
* OK, now we know the exact revision. Initialize omap_chip bits
* for powerdowmain and clockdomain code.
*/
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 if (cpu_is_omap343x()) {
omap_chip.oc = CHIP_IS_OMAP3430;
if (system_rev == OMAP3430_REV_ES1_0)
omap_chip.oc |= CHIP_IS_OMAP3430ES1;
else if (system_rev > OMAP3430_REV_ES1_0)
omap_chip.oc |= CHIP_IS_OMAP3430ES2;
} else {
pr_err("Uninitialized omap_chip, please fix!\n");
}
}

/*
* Set up things for map_io and processor detection later on. Gets called
* pretty much first thing from board init. For multi-omap, this gets
* cpu_is_omapxxxx() working accurately enough for map_io. Then we'll try to
* detect the exact revision later on in omap2_detect_revision() once map_io
* is done.
*/
void __init omap2_set_globals_tap(struct omap_globals *omap2_globals)
{
class = omap2_globals->class;
system_rev = omap2_globals->class;
tap_base = omap2_globals->tap;

if (class == 0x3430)
if (cpu_is_omap34xx())
tap_prod_id = 0x0210;
else
tap_prod_id = 0x0208;
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