"Silicon revision 1.0 devices only provide the MMC2_DAT7 signal when Mode3 is
selected. Silicon revision 2.0 and newer devices implement another level of
pin multiplexing which provides the original MMC2_DAT7 signal or RMII2_CRS_DV
signal when Mode3 is selected. This new level of of pin multiplexing is
selected with bit zero of the SMA2 register."
See AM335x Sitara Processors Manual.
Signed-off-by: Wadim Egorov <w.egorov@xxxxxxxxx>
---
v2: Added silicon revision check. SMA2 register does not exist in revision 1.0
arch/arm/mach-omap/am33xx_generic.c | 17 +++++++++++++++++
arch/arm/mach-omap/include/mach/am33xx-generic.h | 1 +
2 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-omap/am33xx_generic.c b/arch/arm/mach-omap/am33xx_generic.c
index f293134..7fe8881 100644
--- a/arch/arm/mach-omap/am33xx_generic.c
+++ b/arch/arm/mach-omap/am33xx_generic.c
@@ -428,3 +428,20 @@ void am335x_sdram_init(int ioctrl, const struct am33xx_cmd_control *cmd_ctrl,
am33xx_config_sdram(emif_regs);
}
+
+#define AM33XX_CONTROL_SMA2_OFS 0x1320
+
+/**
+ * am33xx_select_rmii2_crs_dv - Select RMII2_CRS_DV on GPMC_A9 pin in MODE3
+ */
+void am33xx_select_rmii2_crs_dv(void)
+{
+ uint32_t val;
+
+ if (am33xx_get_cpu_rev() == AM335X_ES1_0)
+ return;
+
+ val = readl(AM33XX_CTRL_BASE + AM33XX_CONTROL_SMA2_OFS);
+ val |= 0x00000001;
+ writel(val, AM33XX_CTRL_BASE + AM33XX_CONTROL_SMA2_OFS);
+}
diff --git a/arch/arm/mach-omap/include/mach/am33xx-generic.h b/arch/arm/mach-omap/include/mach/am33xx-generic.h
index 6c85d51..1264e7e 100644
--- a/arch/arm/mach-omap/include/mach/am33xx-generic.h
+++ b/arch/arm/mach-omap/include/mach/am33xx-generic.h
@@ -33,5 +33,6 @@ void __noreturn am33xx_reset_cpu(unsigned long addr);
void am33xx_enable_per_clocks(void);
int am33xx_init(void);
int am33xx_devices_init(void);
+void am33xx_select_rmii2_crs_dv(void);
#endif /* __MACH_AM33XX_GENERIC_H */
--
1.7.0.4
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