ARM: 5998/1: ep93xx: added chip revision reading function

Added a new function: ep93xx_chip_revision() which reads chip revision
from the sysconfig register.

Signed-off-by: Mika Westerberg <mika.westerberg@iki.fi>
Acked-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 22 insertions, 0 deletions

diff --git a/arch/arm/mach-ep93xx/core.c b/arch/arm/mach-ep93xx/core.c
index 5b1d836c2f05..8d3f77e9fa86 100644
--- a/arch/arm/mach-ep93xx/core.c
+++ b/arch/arm/mach-ep93xx/core.c
@@ -222,6 +222,20 @@ void ep93xx_devcfg_set_clear(unsigned int set_bits, unsigned int clear_bits)
 }
 EXPORT_SYMBOL(ep93xx_devcfg_set_clear);
 
+/**
+ * ep93xx_chip_revision() - returns the EP93xx chip revision
+ *
+ * See <mach/platform.h> for more information.
+ */
+unsigned int ep93xx_chip_revision(void)
+{
+        unsigned int v;
+
+        v = __raw_readl(EP93XX_SYSCON_SYSCFG);
+        v &= EP93XX_SYSCON_SYSCFG_REV_MASK;
+        v >>= EP93XX_SYSCON_SYSCFG_REV_SHIFT;
+        return v;
+}
 
 /*************************************************************************
  * EP93xx peripheral handling
diff --git a/arch/arm/mach-ep93xx/include/mach/platform.h b/arch/arm/mach-ep93xx/include/mach/platform.h
index c6dc14dbca18..b663390b4d87 100644
--- a/arch/arm/mach-ep93xx/include/mach/platform.h
+++ b/arch/arm/mach-ep93xx/include/mach/platform.h
@@ -33,6 +33,14 @@ static inline void ep93xx_devcfg_clear_bits(unsigned int bits)
         ep93xx_devcfg_set_clear(0x00, bits);
 }
 
+#define EP93XX_CHIP_REV_D0      3
+#define EP93XX_CHIP_REV_D1      4
+#define EP93XX_CHIP_REV_E0      5
+#define EP93XX_CHIP_REV_E1      6
+#define EP93XX_CHIP_REV_E2      7
+
+unsigned int ep93xx_chip_revision(void);
+
 void ep93xx_register_eth(struct ep93xx_eth_data *data, int copy_addr);
 void ep93xx_register_i2c(struct i2c_gpio_platform_data *data,
                          struct i2c_board_info *devices, int num);