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u-boot/board/st-ericsson/snowball/snowball.c
Ramesh Chandrasekaran 1acc5559d9 snowball: Clear UART RX FIFO 
Without usb-serial cable plugged at this stage, some
garbage is seen in UART RX FIFO, which blocks autoboot
progress. The fix makes sure to empty the RX FIFO,
before we wait for user input to interrupt autoboot.

Signed-off-by: Ramesh Chandrasekaran <ramesh.chandrasekaran@stericsson.com>
2012-10-04 16:59:13 +02:00

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/*
* Copyright (C) ST-Ericsson SA 2009
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <config.h>
#include <common.h>
#include <malloc.h>
#include <i2c.h>
#include <mmc.h>
#include <asm/types.h>
#include <asm/io.h>
#include <asm/errno.h>
#include <asm/arch/db8500_pincfg.h>
#include <asm/arch/prcmu.h>
#include <asm/arch/hardware.h>
#include <asm/arch/sys_proto.h>
#ifdef CONFIG_MMC
#include "../../../drivers/mmc/arm_pl180_mmci.h"
#endif
#include "db8500_pins.h"
/*
* Get a global data pointer
*/
DECLARE_GLOBAL_DATA_PTR;
/*
* Memory controller register
*/
#define DMC_BASE_ADDR 0x80156000
#define DMC_CTL_97 (DMC_BASE_ADDR + 0x184)
/*
* GPIO pin config common for MOP500/HREF boards
*/
unsigned long gpio_cfg_common[] = {
/* I2C */
GPIO147_I2C0_SCL,
GPIO148_I2C0_SDA,
GPIO16_I2C1_SCL,
GPIO17_I2C1_SDA,
GPIO10_I2C2_SDA,
GPIO11_I2C2_SCL,
GPIO229_I2C3_SDA,
GPIO230_I2C3_SCL,
/* SSP0, to AB8500 */
GPIO143_SSP0_CLK,
GPIO144_SSP0_FRM,
GPIO145_SSP0_RXD | PIN_PULL_DOWN,
GPIO146_SSP0_TXD,
/* MMC0 (MicroSD card) */
GPIO18_MC0_CMDDIR | PIN_OUTPUT_HIGH,
GPIO19_MC0_DAT0DIR | PIN_OUTPUT_HIGH,
GPIO20_MC0_DAT2DIR | PIN_OUTPUT_HIGH,
GPIO21_MC0_DAT31DIR | PIN_OUTPUT_HIGH,
GPIO22_MC0_FBCLK | PIN_INPUT_NOPULL,
GPIO23_MC0_CLK | PIN_OUTPUT_LOW,
GPIO24_MC0_CMD | PIN_INPUT_PULLUP,
GPIO25_MC0_DAT0 | PIN_INPUT_PULLUP,
GPIO26_MC0_DAT1 | PIN_INPUT_PULLUP,
GPIO27_MC0_DAT2 | PIN_INPUT_PULLUP,
GPIO28_MC0_DAT3 | PIN_INPUT_PULLUP,
/* MMC4 (On-board eMMC) */
GPIO197_MC4_DAT3 | PIN_INPUT_PULLUP,
GPIO198_MC4_DAT2 | PIN_INPUT_PULLUP,
GPIO199_MC4_DAT1 | PIN_INPUT_PULLUP,
GPIO200_MC4_DAT0 | PIN_INPUT_PULLUP,
GPIO201_MC4_CMD | PIN_INPUT_PULLUP,
GPIO202_MC4_FBCLK | PIN_INPUT_NOPULL,
GPIO203_MC4_CLK | PIN_OUTPUT_LOW,
GPIO204_MC4_DAT7 | PIN_INPUT_PULLUP,
GPIO205_MC4_DAT6 | PIN_INPUT_PULLUP,
GPIO206_MC4_DAT5 | PIN_INPUT_PULLUP,
GPIO207_MC4_DAT4 | PIN_INPUT_PULLUP,
/* UART2, console */
GPIO29_U2_RXD | PIN_INPUT_PULLUP,
GPIO30_U2_TXD | PIN_OUTPUT_HIGH,
GPIO31_U2_CTSn | PIN_INPUT_PULLUP,
GPIO32_U2_RTSn | PIN_OUTPUT_HIGH,
/*
* USB, pin 256-267 USB, Is probably already setup correctly from
* BootROM/boot stages, but we don't trust that and set it up anyway
*/
GPIO256_USB_NXT,
GPIO257_USB_STP,
GPIO258_USB_XCLK,
GPIO259_USB_DIR,
GPIO260_USB_DAT7,
GPIO261_USB_DAT6,
GPIO262_USB_DAT5,
GPIO263_USB_DAT4,
GPIO264_USB_DAT3,
GPIO265_USB_DAT2,
GPIO266_USB_DAT1,
GPIO267_USB_DAT0,
};
unsigned long gpio_cfg_snowball[] = {
/* MMC0 (MicroSD card) */
GPIO217_GPIO | PIN_OUTPUT_HIGH, /* MMC_EN */
GPIO218_GPIO | PIN_INPUT_NOPULL, /* MMC_CD */
GPIO228_GPIO | PIN_OUTPUT_HIGH, /* SD_SEL */
/* eMMC */
GPIO167_GPIO | PIN_OUTPUT_HIGH, /* RSTn_MLC */
/* LAN */
GPIO131_SM_ADQ8,
GPIO132_SM_ADQ9,
GPIO133_SM_ADQ10,
GPIO134_SM_ADQ11,
GPIO135_SM_ADQ12,
GPIO136_SM_ADQ13,
GPIO137_SM_ADQ14,
GPIO138_SM_ADQ15,
/* RSTn_LAN */
GPIO141_GPIO | PIN_OUTPUT_HIGH,
};
/*
* Miscellaneous platform dependent initialisations
*/
int board_init(void)
{
/*
* Setup board (bd) and board-info (bi).
* bi_arch_number: Unique id for this board. It will passed in r1 to
* Linux startup code and is the machine_id.
* bi_boot_params: Where this board expects params.
*/
gd->bd->bi_arch_number = MACH_TYPE_SNOWBALL;
gd->bd->bi_boot_params = 0x00000100;
/* Configure GPIO pins needed by U-boot */
db8500_gpio_config_pins(gpio_cfg_common, ARRAY_SIZE(gpio_cfg_common));
db8500_gpio_config_pins(gpio_cfg_snowball,
ARRAY_SIZE(gpio_cfg_snowball));
return 0;
}
int dram_init(void)
{
gd->bd->bi_dram[0].start = CONFIG_SYS_SDRAM_BASE;
gd->ram_size = gd->bd->bi_dram[0].size =
get_ram_size(CONFIG_SYS_SDRAM_BASE, CONFIG_SYS_MAX_RAM_SIZE);
return 0;
}
static int raise_ab8500_gpio16(void)
{
int ret;
/* selection */
ret = ab8500_read(AB8500_MISC, AB8500_GPIO_SEL2_REG);
if (ret < 0)
goto out;
ret |= 0x80;
ret = ab8500_write(AB8500_MISC, AB8500_GPIO_SEL2_REG, ret);
if (ret < 0)
goto out;
/* direction */
ret = ab8500_read(AB8500_MISC, AB8500_GPIO_DIR2_REG);
if (ret < 0)
goto out;
ret |= 0x80;
ret = ab8500_write(AB8500_MISC, AB8500_GPIO_DIR2_REG, ret);
if (ret < 0)
goto out;
/* out */
ret = ab8500_read(AB8500_MISC, AB8500_GPIO_OUT2_REG);
if (ret < 0)
goto out;
ret |= 0x80;
ret = ab8500_write(AB8500_MISC, AB8500_GPIO_OUT2_REG, ret);
out:
return ret;
}
static int raise_ab8500_gpio26(void)
{
int ret;
/* selection */
ret = ab8500_read(AB8500_MISC, AB8500_GPIO_DIR4_REG);
if (ret < 0)
goto out;
ret |= 0x2;
ret = ab8500_write(AB8500_MISC, AB8500_GPIO_DIR4_REG, ret);
if (ret < 0)
goto out;
/* out */
ret = ab8500_read(AB8500_MISC, AB8500_GPIO_OUT4_REG);
if (ret < 0)
goto out;
ret |= 0x2;
ret = ab8500_write(AB8500_MISC, AB8500_GPIO_OUT4_REG, ret);
out:
return ret;
}
int board_late_init(void)
{
/* enable 3V3 for LAN controller */
if (raise_ab8500_gpio26() >= 0) {
/* Turn on FSMC device */
writel(0x1, 0x8000f000);
writel(0x1, 0x8000f008);
/* setup FSMC for LAN controler */
writel(0x305b, 0x80000000);
/* run at the highest possible speed */
writel(0x01010210, 0x80000004);
} else
printf("error: can't raise GPIO26\n");
/* enable 3v6 for GBF chip */
if ((raise_ab8500_gpio16() < 0))
printf("error: cant' raise GPIO16\n");
/* empty UART RX FIFO */
while (tstc())
(void) getc();
return 0;
}
#ifdef CONFIG_MMC
/*
* emmc_host_init - initialize the emmc controller.
* Configure GPIO settings, set initial clock and power for emmc slot.
* Initialize mmc struct and register with mmc framework.
*/
static int emmc_host_init(void)
{
struct pl180_mmc_host *host;
host = malloc(sizeof(struct pl180_mmc_host));
if (!host)
return -ENOMEM;
memset(host, 0, sizeof(*host));
host->base = (struct sdi_registers *)CFG_EMMC_BASE;
host->pwr_init = SDI_PWR_OPD | SDI_PWR_PWRCTRL_ON;
host->clkdiv_init = SDI_CLKCR_CLKDIV_INIT_V2 |
SDI_CLKCR_CLKEN | SDI_CLKCR_HWFC_EN;
strcpy(host->name, "EMMC");
host->caps = MMC_MODE_8BIT | MMC_MODE_HS | MMC_MODE_HS_52MHz;
host->voltages = VOLTAGE_WINDOW_MMC;
host->clock_min = ARM_MCLK / (2 + SDI_CLKCR_CLKDIV_INIT_V2);
host->clock_max = ARM_MCLK / 2;
host->clock_in = ARM_MCLK;
host->version2 = 1;
return arm_pl180_mmci_init(host);
}
/*
* mmc_host_init - initialize the external mmc controller.
* Configure GPIO settings, set initial clock and power for mmc slot.
* Initialize mmc struct and register with mmc framework.
*/
static int mmc_host_init(void)
{
struct pl180_mmc_host *host;
u32 sdi_u32;
host = malloc(sizeof(struct pl180_mmc_host));
if (!host)
return -ENOMEM;
memset(host, 0, sizeof(*host));
host->base = (struct sdi_registers *)CFG_MMC_BASE;
sdi_u32 = 0xBF;
writel(sdi_u32, &host->base->power);
host->pwr_init = 0xBF;
host->clkdiv_init = SDI_CLKCR_CLKDIV_INIT_V2 |
SDI_CLKCR_CLKEN | SDI_CLKCR_HWFC_EN;
strcpy(host->name, "MMC");
host->caps = MMC_MODE_8BIT;
host->b_max = 0;
host->voltages = VOLTAGE_WINDOW_SD;
host->clock_min = ARM_MCLK / (2 + SDI_CLKCR_CLKDIV_INIT_V2);
host->clock_max = ARM_MCLK / 2;
host->clock_in = ARM_MCLK;
host->version2 = 1;
return arm_pl180_mmci_init(host);
}
/*
* board_mmc_init - initialize all the mmc/sd host controllers.
* Called by generic mmc framework.
*/
int board_mmc_init(bd_t *bis)
{
int error;
(void) bis;
error = emmc_host_init();
if (error) {
printf("emmc_host_init() %d\n", error);
return -1;
}
u8500_mmc_power_init();
error = mmc_host_init();
if (error) {
printf("mmc_host_init() %d\n", error);
return -1;
}
return 0;
}
#endif /* CONFIG_MMC */
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