From 76cff2b10857c86211ef60024e672ce178cb6d69 Mon Sep 17 00:00:00 2001 From: Nishanth Menon Date: Thu, 13 Aug 2015 09:51:00 -0500 Subject: ARM: DRA74-evm: Use SMA_1 spare register to workaround DP83865 phy on SR2.0 DP83865 ethernet phy used on DRA74x-evm is quirky and the datasheet provided IODELAY values for standard RGMII phys do not work. Silicon Revision(SR) 2.0 provides an alternative bit configuration that allows us to do a "gross adjustment" to launch the data off a different internal clock edge. Manual IO Delay overrides are still necessary to fine tune the clock-to-data delays. This is a necessary workaround for the quirky ethernet Phy we have on the platform. NOTE: SMA registers are spare "kitchen sink" registers that does contain bits for other workaround as necessary as well. Hence the control for the same is introduced in a generic SoC specific, board generic location. Signed-off-by: Nishanth Menon Reviewed-by: Tom Rini --- arch/arm/cpu/armv7/omap5/prcm-regs.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'arch/arm/cpu') diff --git a/arch/arm/cpu/armv7/omap5/prcm-regs.c b/arch/arm/cpu/armv7/omap5/prcm-regs.c index d01ce88306..fffe0ee913 100644 --- a/arch/arm/cpu/armv7/omap5/prcm-regs.c +++ b/arch/arm/cpu/armv7/omap5/prcm-regs.c @@ -11,6 +11,7 @@ */ #include +#include struct prcm_regs const omap5_es1_prcm = { /* cm1.ckgen */ @@ -379,6 +380,7 @@ struct omap_sys_ctrl_regs const dra7xx_ctrl = { .control_phy_power_usb = 0x4A002370, .control_phy_power_sata = 0x4A002374, .ctrl_core_sma_sw_0 = 0x4A0023FC, + .ctrl_core_sma_sw_1 = 0x4A002534, .control_core_mac_id_0_lo = 0x4A002514, .control_core_mac_id_0_hi = 0x4A002518, .control_core_mac_id_1_lo = 0x4A00251C, @@ -994,3 +996,10 @@ struct prcm_regs const dra7xx_prcm = { .cm_l3main1_tptc1_clkctrl = 0x4a008778, .cm_l3main1_tptc2_clkctrl = 0x4a008780, }; + +void clrset_spare_register(u8 spare_type, u32 clear_bits, u32 set_bits) +{ + u32 reg = spare_type ? (*ctrl)->ctrl_core_sma_sw_1 : + (*ctrl)->ctrl_core_sma_sw_0; + clrsetbits_le32(reg, clear_bits, set_bits); +} -- cgit v1.2.1