rockchip: pinctrl: rk3399: add gmac io strength support

GMAC controller need to init the tx io driver strength to 13mA,
just like the description in dts pinctrl node, or else the controller
may only work in 100MHz Mode, and fail to work at 1000MHz mode.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com <mailto:philipp.tomsich@theobroma-systems.com>>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/arm/include/asm/arch-rockchip/grf_rk3399.h

@@ -151,10 +151,11 @@ struct rk3399_grf_regs {
 	u32 gpio2_sr[3][4];
 	u32 reserved23[4];
 	u32 gpio2_smt[3][4];
-	u32 reserved24[(0xe130 - 0xe0ec)/4 - 1];
-	u32 gpio4b_e01;
-	u32 gpio4b_e2;
-	u32 reserved24a[(0xe200 - 0xe134)/4 - 1];
+	u32 reserved24[(0xe100 - 0xe0ec)/4 - 1];
+	u32 gpio2_e[4];
+	u32 gpio3_e[7];
+	u32 gpio4_e[5];
+	u32 reserved24a[(0xe200 - 0xe13c)/4 - 1];
 	u32 soc_con0;
 	u32 soc_con1;
 	u32 soc_con2;
@@ -455,6 +456,72 @@ enum {
 	GRF_GPIO4C6_SEL_MASK    = 3 << GRF_GPIO4C6_SEL_SHIFT,
 	GRF_PWM_1               = 1,
 
+	/* GRF_GPIO3A_E01 */
+	GRF_GPIO3A0_E_SHIFT = 0,
+	GRF_GPIO3A0_E_MASK = 7 << GRF_GPIO3A0_E_SHIFT,
+	GRF_GPIO3A1_E_SHIFT = 3,
+	GRF_GPIO3A1_E_MASK = 7 << GRF_GPIO3A1_E_SHIFT,
+	GRF_GPIO3A2_E_SHIFT = 6,
+	GRF_GPIO3A2_E_MASK = 7 << GRF_GPIO3A2_E_SHIFT,
+	GRF_GPIO3A3_E_SHIFT = 9,
+	GRF_GPIO3A3_E_MASK = 7 << GRF_GPIO3A3_E_SHIFT,
+	GRF_GPIO3A4_E_SHIFT = 12,
+	GRF_GPIO3A4_E_MASK = 7 << GRF_GPIO3A4_E_SHIFT,
+	GRF_GPIO3A5_E0_SHIFT = 15,
+	GRF_GPIO3A5_E0_MASK = 1 << GRF_GPIO3A5_E0_SHIFT,
+
+	/*  GRF_GPIO3A_E2 */
+	GRF_GPIO3A5_E12_SHIFT = 0,
+	GRF_GPIO3A5_E12_MASK = 3 << GRF_GPIO3A5_E12_SHIFT,
+	GRF_GPIO3A6_E_SHIFT = 2,
+	GRF_GPIO3A6_E_MASK = 7 << GRF_GPIO3A6_E_SHIFT,
+	GRF_GPIO3A7_E_SHIFT = 5,
+	GRF_GPIO3A7_E_MASK = 7 << GRF_GPIO3A7_E_SHIFT,
+
+	/* GRF_GPIO3B_E01 */
+	GRF_GPIO3B0_E_SHIFT = 0,
+	GRF_GPIO3B0_E_MASK = 7 << GRF_GPIO3B0_E_SHIFT,
+	GRF_GPIO3B1_E_SHIFT = 3,
+	GRF_GPIO3B1_E_MASK = 7 << GRF_GPIO3B1_E_SHIFT,
+	GRF_GPIO3B2_E_SHIFT = 6,
+	GRF_GPIO3B2_E_MASK = 7 << GRF_GPIO3B2_E_SHIFT,
+	GRF_GPIO3B3_E_SHIFT = 9,
+	GRF_GPIO3B3_E_MASK = 7 << GRF_GPIO3B3_E_SHIFT,
+	GRF_GPIO3B4_E_SHIFT = 12,
+	GRF_GPIO3B4_E_MASK = 7 << GRF_GPIO3B4_E_SHIFT,
+	GRF_GPIO3B5_E0_SHIFT = 15,
+	GRF_GPIO3B5_E0_MASK = 1 << GRF_GPIO3B5_E0_SHIFT,
+
+	/*  GRF_GPIO3A_E2 */
+	GRF_GPIO3B5_E12_SHIFT = 0,
+	GRF_GPIO3B5_E12_MASK = 3 << GRF_GPIO3B5_E12_SHIFT,
+	GRF_GPIO3B6_E_SHIFT = 2,
+	GRF_GPIO3B6_E_MASK = 7 << GRF_GPIO3B6_E_SHIFT,
+	GRF_GPIO3B7_E_SHIFT = 5,
+	GRF_GPIO3B7_E_MASK = 7 << GRF_GPIO3B7_E_SHIFT,
+
+	/* GRF_GPIO3C_E01 */
+	GRF_GPIO3C0_E_SHIFT = 0,
+	GRF_GPIO3C0_E_MASK = 7 << GRF_GPIO3C0_E_SHIFT,
+	GRF_GPIO3C1_E_SHIFT = 3,
+	GRF_GPIO3C1_E_MASK = 7 << GRF_GPIO3C1_E_SHIFT,
+	GRF_GPIO3C2_E_SHIFT = 6,
+	GRF_GPIO3C2_E_MASK = 7 << GRF_GPIO3C2_E_SHIFT,
+	GRF_GPIO3C3_E_SHIFT = 9,
+	GRF_GPIO3C3_E_MASK = 7 << GRF_GPIO3C3_E_SHIFT,
+	GRF_GPIO3C4_E_SHIFT = 12,
+	GRF_GPIO3C4_E_MASK = 7 << GRF_GPIO3C4_E_SHIFT,
+	GRF_GPIO3C5_E0_SHIFT = 15,
+	GRF_GPIO3C5_E0_MASK = 1 << GRF_GPIO3C5_E0_SHIFT,
+
+	/*  GRF_GPIO3C_E2 */
+	GRF_GPIO3C5_E12_SHIFT = 0,
+	GRF_GPIO3C5_E12_MASK = 3 << GRF_GPIO3C5_E12_SHIFT,
+	GRF_GPIO3C6_E_SHIFT = 2,
+	GRF_GPIO3C6_E_MASK = 7 << GRF_GPIO3C6_E_SHIFT,
+	GRF_GPIO3C7_E_SHIFT = 5,
+	GRF_GPIO3C7_E_MASK = 7 << GRF_GPIO3C7_E_SHIFT,
+
 	/* GRF_SOC_CON7 */
 	GRF_UART_DBG_SEL_SHIFT	= 10,
 	GRF_UART_DBG_SEL_MASK	= 3 << GRF_UART_DBG_SEL_SHIFT,

drivers/pinctrl/rockchip/pinctrl_rk3399.c

@@ -244,6 +244,24 @@ static void pinctrl_rk3399_gmac_config(struct rk3399_grf_regs *grf, int mmc_id)
 	rk_clrsetreg(&grf->gpio3c_iomux,
 		     GRF_GPIO3C1_SEL_MASK,
 		     GRF_MAC_TXCLK << GRF_GPIO3C1_SEL_SHIFT);
+
+	/* Set drive strength for GMAC tx io, value 3 means 13mA */
+	rk_clrsetreg(&grf->gpio3_e[0],
+		     GRF_GPIO3A0_E_MASK | GRF_GPIO3A1_E_MASK |
+		     GRF_GPIO3A4_E_MASK | GRF_GPIO3A5_E0_MASK,
+		     3 << GRF_GPIO3A0_E_SHIFT |
+		     3 << GRF_GPIO3A1_E_SHIFT |
+		     3 << GRF_GPIO3A4_E_SHIFT |
+		     1 << GRF_GPIO3A5_E0_SHIFT);
+	rk_clrsetreg(&grf->gpio3_e[1],
+		     GRF_GPIO3A5_E12_MASK,
+		     1 << GRF_GPIO3A5_E12_SHIFT);
+	rk_clrsetreg(&grf->gpio3_e[2],
+		     GRF_GPIO3B4_E_MASK,
+		     3 << GRF_GPIO3B4_E_SHIFT);
+	rk_clrsetreg(&grf->gpio3_e[4],
+		     GRF_GPIO3C1_E_MASK,
+		     3 << GRF_GPIO3C1_E_SHIFT);
 }
 #endif