From df48676aea313fdaeef0b356dfde386b656e152d Mon Sep 17 00:00:00 2001 From: Sudhakar Rajashekhara Date: Thu, 18 Nov 2010 09:59:37 -0500 Subject: da850: Add RMII support for EMAC This patch is a port of the work by Sudhakar Rajeshekhara in commit ab3effbcad8851cc65dc5241a01c064d2030a3b2 of git://arago-project.org/git/people/sandeep/u-boot-davinci.git. The da850 UI board has on it an RMII PHY which can be used if the MDC line to the MII PHY on the baseboard is disabled and the RMII PHY is enabled by configuring the values of some GPIO pins on the IO expander of the UI board. This patch implements disabling that line via GPIO2[6], configuring the UI board's IO expander and setting only the pinmux settings that are needed for RMII operation. Tested on da850evm by adding a define for CONFIG_DRIVER_TI_EMAC_USE_RMII. Signed-off-by: Sudhakar Rajashekhara Signed-off-by: Ben Gardiner CC: Sandeep Paulraj CC: Ben Warren CC: Mike Frysinger CC: Sughosh Ganu Signed-off-by: Sandeep Paulraj --- board/davinci/da8xxevm/common.c | 14 +++++ board/davinci/da8xxevm/da850evm.c | 112 ++++++++++++++++++++++++++++++++++++-- 2 files changed, 122 insertions(+), 4 deletions(-) (limited to 'board') diff --git a/board/davinci/da8xxevm/common.c b/board/davinci/da8xxevm/common.c index 36bf693..2d9a64b 100644 --- a/board/davinci/da8xxevm/common.c +++ b/board/davinci/da8xxevm/common.c @@ -53,3 +53,17 @@ int da8xx_configure_lpsc_items(const struct lpsc_resource *item, return 0; } + +#if defined(CONFIG_DRIVER_TI_EMAC) && defined(CONFIG_MACH_DAVINCI_DA850_EVM) +void da850_emac_mii_mode_sel(int mode_sel) +{ + int val; + + val = readl(&davinci_syscfg_regs->cfgchip3); + if (mode_sel == 0) + val &= ~(1 << 8); + else + val |= (1 << 8); + writel(val, &davinci_syscfg_regs->cfgchip3); +} +#endif diff --git a/board/davinci/da8xxevm/da850evm.c b/board/davinci/da8xxevm/da850evm.c index 8c9ff7c..291757c 100644 --- a/board/davinci/da8xxevm/da850evm.c +++ b/board/davinci/da8xxevm/da850evm.c @@ -54,6 +54,15 @@ static const struct pinmux_config uart_pins[] = { #ifdef CONFIG_DRIVER_TI_EMAC static const struct pinmux_config emac_pins[] = { +#ifdef CONFIG_DRIVER_TI_EMAC_USE_RMII + { pinmux(14), 8, 2 }, + { pinmux(14), 8, 3 }, + { pinmux(14), 8, 4 }, + { pinmux(14), 8, 5 }, + { pinmux(14), 8, 6 }, + { pinmux(14), 8, 7 }, + { pinmux(15), 8, 1 }, +#else /* ! CONFIG_DRIVER_TI_EMAC_USE_RMII */ { pinmux(2), 8, 1 }, { pinmux(2), 8, 2 }, { pinmux(2), 8, 3 }, @@ -69,10 +78,10 @@ static const struct pinmux_config emac_pins[] = { { pinmux(3), 8, 5 }, { pinmux(3), 8, 6 }, { pinmux(3), 8, 7 }, +#endif /* CONFIG_DRIVER_TI_EMAC_USE_RMII */ { pinmux(4), 8, 0 }, { pinmux(4), 8, 1 } }; -#endif /* CONFIG_DRIVER_TI_EMAC */ /* I2C pin muxer settings */ static const struct pinmux_config i2c_pins[] = { @@ -99,6 +108,13 @@ const struct pinmux_config nand_pins[] = { }; #endif +#ifdef CONFIG_DRIVER_TI_EMAC_USE_RMII +#define HAS_RMII 1 +#else +#define HAS_RMII 0 +#endif +#endif /* CONFIG_DRIVER_TI_EMAC */ + static const struct pinmux_resource pinmuxes[] = { #ifdef CONFIG_SPI_FLASH PINMUX_ITEM(spi1_pins), @@ -203,9 +219,8 @@ int board_init(void) #ifdef CONFIG_DRIVER_TI_EMAC if (davinci_configure_pin_mux(emac_pins, ARRAY_SIZE(emac_pins)) != 0) return 1; - /* set cfgchip3 to select MII */ - writel(readl(&davinci_syscfg_regs->cfgchip3) & ~(1 << 8), - &davinci_syscfg_regs->cfgchip3); + + da850_emac_mii_mode_sel(HAS_RMII); #endif /* CONFIG_DRIVER_TI_EMAC */ /* enable the console UART */ @@ -218,11 +233,100 @@ int board_init(void) #ifdef CONFIG_DRIVER_TI_EMAC +#ifdef CONFIG_DRIVER_TI_EMAC_USE_RMII +/** + * rmii_hw_init + * + * DA850/OMAP-L138 EVM can interface to a daughter card for + * additional features. This card has an I2C GPIO Expander TCA6416 + * to select the required functions like camera, RMII Ethernet, + * character LCD, video. + * + * Initialization of the expander involves configuring the + * polarity and direction of the ports. P07-P05 are used here. + * These ports are connected to a Mux chip which enables only one + * functionality at a time. + * + * For RMII phy to respond, the MII MDIO clock has to be disabled + * since both the PHY devices have address as zero. The MII MDIO + * clock is controlled via GPIO2[6]. + * + * This code is valid for Beta version of the hardware + */ +int rmii_hw_init(void) +{ + const struct pinmux_config gpio_pins[] = { + { pinmux(6), 8, 1 } + }; + u_int8_t buf[2]; + unsigned int temp; + int ret; + + /* PinMux for GPIO */ + if (davinci_configure_pin_mux(gpio_pins, ARRAY_SIZE(gpio_pins)) != 0) + return 1; + + /* I2C Exapnder configuration */ + /* Set polarity to non-inverted */ + buf[0] = 0x0; + buf[1] = 0x0; + ret = i2c_write(CONFIG_SYS_I2C_EXPANDER_ADDR, 4, 1, buf, 2); + if (ret) { + printf("\nExpander @ 0x%02x write FAILED!!!\n", + CONFIG_SYS_I2C_EXPANDER_ADDR); + return ret; + } + + /* Configure P07-P05 as outputs */ + buf[0] = 0x1f; + buf[1] = 0xff; + ret = i2c_write(CONFIG_SYS_I2C_EXPANDER_ADDR, 6, 1, buf, 2); + if (ret) { + printf("\nExpander @ 0x%02x write FAILED!!!\n", + CONFIG_SYS_I2C_EXPANDER_ADDR); + } + + /* For Ethernet RMII selection + * P07(SelA)=0 + * P06(SelB)=1 + * P05(SelC)=1 + */ + if (i2c_read(CONFIG_SYS_I2C_EXPANDER_ADDR, 2, 1, buf, 1)) { + printf("\nExpander @ 0x%02x read FAILED!!!\n", + CONFIG_SYS_I2C_EXPANDER_ADDR); + } + + buf[0] &= 0x1f; + buf[0] |= (0 << 7) | (1 << 6) | (1 << 5); + if (i2c_write(CONFIG_SYS_I2C_EXPANDER_ADDR, 2, 1, buf, 1)) { + printf("\nExpander @ 0x%02x write FAILED!!!\n", + CONFIG_SYS_I2C_EXPANDER_ADDR); + } + + /* Set the output as high */ + temp = REG(GPIO_BANK2_REG_SET_ADDR); + temp |= (0x01 << 6); + REG(GPIO_BANK2_REG_SET_ADDR) = temp; + + /* Set the GPIO direction as output */ + temp = REG(GPIO_BANK2_REG_DIR_ADDR); + temp &= ~(0x01 << 6); + REG(GPIO_BANK2_REG_DIR_ADDR) = temp; + + return 0; +} +#endif /* CONFIG_DRIVER_TI_EMAC_USE_RMII */ + /* * Initializes on-board ethernet controllers. */ int board_eth_init(bd_t *bis) { +#ifdef CONFIG_DRIVER_TI_EMAC_USE_RMII + /* Select RMII fucntion through the expander */ + if (rmii_hw_init()) + printf("RMII hardware init failed!!!\n"); +#endif if (!davinci_emac_initialize()) { printf("Error: Ethernet init failed!\n"); return -1; -- cgit v1.1