From: Adam YH Lee adam.yh.lee@gmail.com
AM335x-based 'Gumstix Pepper' SBCs and variants use different types of RAM (DDR2 vs DDR3 with DDR3 being the default). Detect the board type by reading the factory-programmed EEPROM [1] and use this to select any runtime boot options such as RAM type.
[1] http://elinux.org/BeagleBoardPinMux#List_of_Vendor_and_Device_IDs
Signed-off-by: Adam YH Lee adam.yh.lee@gmail.com Signed-off-by: Ash Charles ashcharles@gmail.com --- board/gumstix/pepper/board.c | 124 ++++++++++++++++++++++++++++++++++++------- board/gumstix/pepper/board.h | 13 +++++ board/gumstix/pepper/mux.c | 5 ++ include/configs/pepper.h | 2 + 4 files changed, 124 insertions(+), 20 deletions(-)
diff --git a/board/gumstix/pepper/board.c b/board/gumstix/pepper/board.c index f644f81..acf1c64 100644 --- a/board/gumstix/pepper/board.c +++ b/board/gumstix/pepper/board.c @@ -33,6 +33,46 @@ DECLARE_GLOBAL_DATA_PTR;
#ifdef CONFIG_SPL_BUILD +#define OSC (V_OSCK/1000000) + +static const struct ddr_data ddr3_data = { + .datardsratio0 = MT41K256M16HA125E_RD_DQS, + .datawdsratio0 = MT41K256M16HA125E_WR_DQS, + .datafwsratio0 = MT41K256M16HA125E_PHY_FIFO_WE, + .datawrsratio0 = MT41K256M16HA125E_PHY_WR_DATA, +}; + +static const struct cmd_control ddr3_cmd_ctrl_data = { + .cmd0csratio = MT41K256M16HA125E_RATIO, + .cmd0iclkout = MT41K256M16HA125E_INVERT_CLKOUT, + + .cmd1csratio = MT41K256M16HA125E_RATIO, + .cmd1iclkout = MT41K256M16HA125E_INVERT_CLKOUT, + + .cmd2csratio = MT41K256M16HA125E_RATIO, + .cmd2iclkout = MT41K256M16HA125E_INVERT_CLKOUT, +}; + +static struct emif_regs ddr3_emif_reg_data = { + .sdram_config = MT41K256M16HA125E_EMIF_SDCFG, + .ref_ctrl = MT41K256M16HA125E_EMIF_SDREF, + .sdram_tim1 = MT41K256M16HA125E_EMIF_TIM1, + .sdram_tim2 = MT41K256M16HA125E_EMIF_TIM2, + .sdram_tim3 = MT41K256M16HA125E_EMIF_TIM3, + .zq_config = MT41K256M16HA125E_ZQ_CFG, + .emif_ddr_phy_ctlr_1 = MT41K256M16HA125E_EMIF_READ_LATENCY, +}; + +const struct dpll_params dpll_ddr3 = {400, OSC-1, 1, -1, -1, -1, -1}; + +const struct ctrl_ioregs ioregs_ddr3 = { + .cm0ioctl = MT41K256M16HA125E_IOCTRL_VALUE, + .cm1ioctl = MT41K256M16HA125E_IOCTRL_VALUE, + .cm2ioctl = MT41K256M16HA125E_IOCTRL_VALUE, + .dt0ioctl = MT41K256M16HA125E_IOCTRL_VALUE, + .dt1ioctl = MT41K256M16HA125E_IOCTRL_VALUE, +}; + static const struct ddr_data ddr2_data = { .datardsratio0 = MT47H128M16RT25E_RD_DQS, .datafwsratio0 = MT47H128M16RT25E_PHY_FIFO_WE, @@ -56,6 +96,70 @@ static const struct emif_regs ddr2_emif_reg_data = { .emif_ddr_phy_ctlr_1 = MT47H128M16RT25E_EMIF_READ_LATENCY, };
+const struct dpll_params dpll_ddr2 = {266, OSC-1, 1, -1, -1, -1, -1}; + +const struct ctrl_ioregs ioregs_ddr2 = { + .cm0ioctl = MT47H128M16RT25E_IOCTRL_VALUE, + .cm1ioctl = MT47H128M16RT25E_IOCTRL_VALUE, + .cm2ioctl = MT47H128M16RT25E_IOCTRL_VALUE, + .dt0ioctl = MT47H128M16RT25E_IOCTRL_VALUE, + .dt1ioctl = MT47H128M16RT25E_IOCTRL_VALUE, +}; + +static int read_eeprom(struct pepper_board_id *header) +{ + if (i2c_probe(CONFIG_SYS_I2C_EEPROM_ADDR)) { + return -ENODEV; + } + + if (i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0, 1, (uchar *)header, + sizeof(struct pepper_board_id))) { + return -EIO; + } + + return 0; +} + +const struct dpll_params *get_dpll_ddr_params(void) +{ + struct pepper_board_id header; + + enable_i2c0_pin_mux(); + i2c_set_bus_num(0); + + if (read_eeprom(&header) < 0) + return &dpll_ddr3; + + switch (header.device_vendor) { + case GUMSTIX_PEPPER: + return &dpll_ddr2; + case GUMSTIX_PEPPER_DVI: + return &dpll_ddr3; + default: + return &dpll_ddr3; + } +} + +void sdram_init(void) +{ + const struct dpll_params *dpll = get_dpll_ddr_params(); + + /* + * Here we are assuming PLL clock reveals the type of RAM. + * DDR2 = 266 + * DDR3 = 400 + * Note that DDR3 is the default. + */ + if (dpll->m == 266) { + config_ddr(dpll->m, &ioregs_ddr2, &ddr2_data, + &ddr2_cmd_ctrl_data, &ddr2_emif_reg_data, 0); + } + else if (dpll->m == 400) { + config_ddr(dpll->m, &ioregs_ddr3, &ddr3_data, + &ddr3_cmd_ctrl_data, &ddr3_emif_reg_data, 0); + } +} + #ifdef CONFIG_SPL_OS_BOOT int spl_start_uboot(void) { @@ -64,14 +168,6 @@ int spl_start_uboot(void) } #endif
-#define OSC (V_OSCK/1000000) -const struct dpll_params dpll_ddr = {266, OSC-1, 1, -1, -1, -1, -1}; - -const struct dpll_params *get_dpll_ddr_params(void) -{ - return &dpll_ddr; -} - void set_uart_mux_conf(void) { enable_uart0_pin_mux(); @@ -82,19 +178,7 @@ void set_mux_conf_regs(void) enable_board_pin_mux(); }
-const struct ctrl_ioregs ioregs = { - .cm0ioctl = MT47H128M16RT25E_IOCTRL_VALUE, - .cm1ioctl = MT47H128M16RT25E_IOCTRL_VALUE, - .cm2ioctl = MT47H128M16RT25E_IOCTRL_VALUE, - .dt0ioctl = MT47H128M16RT25E_IOCTRL_VALUE, - .dt1ioctl = MT47H128M16RT25E_IOCTRL_VALUE, -};
-void sdram_init(void) -{ - config_ddr(266, &ioregs, &ddr2_data, - &ddr2_cmd_ctrl_data, &ddr2_emif_reg_data, 0); -} #endif
int board_init(void) diff --git a/board/gumstix/pepper/board.h b/board/gumstix/pepper/board.h index 0512735..a6df319 100644 --- a/board/gumstix/pepper/board.h +++ b/board/gumstix/pepper/board.h @@ -9,6 +9,18 @@ #ifndef _BOARD_H_ #define _BOARD_H_
+#define GUMSTIX_PEPPER 0x30000200 +#define GUMSTIX_PEPPER_DVI 0x31000200 + +struct pepper_board_id { + unsigned int device_vendor; + unsigned char revision; + unsigned char content; + char fab_revision[8]; + char env_var[16]; + char en_setting[64]; +}; + /* * We must be able to enable uart0, for initial output. We then have a * main pinmux function that can be overridden to enable all other pinmux that @@ -16,4 +28,5 @@ */ void enable_uart0_pin_mux(void); void enable_board_pin_mux(void); +void enable_i2c0_pin_mux(void); #endif diff --git a/board/gumstix/pepper/mux.c b/board/gumstix/pepper/mux.c index 50b1266..92c73f8 100644 --- a/board/gumstix/pepper/mux.c +++ b/board/gumstix/pepper/mux.c @@ -64,6 +64,11 @@ void enable_uart0_pin_mux(void) configure_module_pin_mux(uart0_pin_mux); }
+void enable_i2c0_pin_mux(void) +{ + configure_module_pin_mux(i2c0_pin_mux); +} + /* * Do board-specific muxes. */ diff --git a/include/configs/pepper.h b/include/configs/pepper.h index cc153ab..16149f6 100644 --- a/include/configs/pepper.h +++ b/include/configs/pepper.h @@ -20,6 +20,8 @@ #undef CONFIG_SYS_PROMPT #define CONFIG_SYS_PROMPT "pepper# "
+#define CONFIG_SYS_I2C_EEPROM_ADDR 0x50 + /* Mach type */ #define MACH_TYPE_PEPPER 4207 /* Until the next sync */ #define CONFIG_MACH_TYPE MACH_TYPE_PEPPER