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android_kernel_motorola_sm6225/arch/arm/mach-mx3/mx31moboard.c
Valentin Longchamp 421bf82e99 mx31moboard: serial port fix 
We get rid of CTS/RTS lines on uart0 on our platform.
This is the port we use as main kernel console. We do not
want it to be blocking because of CTS/RTS signals, not allowing
the system to boot or print messages.

However we often use it with a bluetooth module needing CTS/RTS
lines as backup login in case of trouble. To be able to use it,
we assert CTS low so that the module can always send chars.

Signed-off-by: Valentin Longchamp <valentin.longchamp@epfl.ch>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
2009-11-14 10:29:14 +01:00

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/*
* Copyright (C) 2008 Valentin Longchamp, EPFL Mobots group
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/delay.h>
#include <linux/fsl_devices.h>
#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/leds.h>
#include <linux/memory.h>
#include <linux/mtd/physmap.h>
#include <linux/mtd/partitions.h>
#include <linux/platform_device.h>
#include <linux/types.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/time.h>
#include <asm/mach/map.h>
#include <mach/board-mx31moboard.h>
#include <mach/common.h>
#include <mach/hardware.h>
#include <mach/imx-uart.h>
#include <mach/iomux-mx3.h>
#include <mach/i2c.h>
#include <mach/mmc.h>
#include <mach/mx31.h>
#include "devices.h"
static unsigned int moboard_pins[] = {
/* UART0 */
MX31_PIN_TXD1__TXD1, MX31_PIN_RXD1__RXD1,
MX31_PIN_CTS1__GPIO2_7,
/* UART4 */
MX31_PIN_PC_RST__CTS5, MX31_PIN_PC_VS2__RTS5,
MX31_PIN_PC_BVD2__TXD5, MX31_PIN_PC_BVD1__RXD5,
/* I2C0 */
MX31_PIN_I2C_DAT__I2C1_SDA, MX31_PIN_I2C_CLK__I2C1_SCL,
/* I2C1 */
MX31_PIN_DCD_DTE1__I2C2_SDA, MX31_PIN_RI_DTE1__I2C2_SCL,
/* SDHC1 */
MX31_PIN_SD1_DATA3__SD1_DATA3, MX31_PIN_SD1_DATA2__SD1_DATA2,
MX31_PIN_SD1_DATA1__SD1_DATA1, MX31_PIN_SD1_DATA0__SD1_DATA0,
MX31_PIN_SD1_CLK__SD1_CLK, MX31_PIN_SD1_CMD__SD1_CMD,
MX31_PIN_ATA_CS0__GPIO3_26, MX31_PIN_ATA_CS1__GPIO3_27,
/* USB reset */
MX31_PIN_GPIO1_0__GPIO1_0,
/* USB OTG */
MX31_PIN_USBOTG_DATA0__USBOTG_DATA0,
MX31_PIN_USBOTG_DATA1__USBOTG_DATA1,
MX31_PIN_USBOTG_DATA2__USBOTG_DATA2,
MX31_PIN_USBOTG_DATA3__USBOTG_DATA3,
MX31_PIN_USBOTG_DATA4__USBOTG_DATA4,
MX31_PIN_USBOTG_DATA5__USBOTG_DATA5,
MX31_PIN_USBOTG_DATA6__USBOTG_DATA6,
MX31_PIN_USBOTG_DATA7__USBOTG_DATA7,
MX31_PIN_USBOTG_CLK__USBOTG_CLK, MX31_PIN_USBOTG_DIR__USBOTG_DIR,
MX31_PIN_USBOTG_NXT__USBOTG_NXT, MX31_PIN_USBOTG_STP__USBOTG_STP,
MX31_PIN_USB_OC__GPIO1_30,
/* LEDs */
MX31_PIN_SVEN0__GPIO2_0, MX31_PIN_STX0__GPIO2_1,
MX31_PIN_SRX0__GPIO2_2, MX31_PIN_SIMPD0__GPIO2_3,
/* SEL */
MX31_PIN_DTR_DCE1__GPIO2_8, MX31_PIN_DSR_DCE1__GPIO2_9,
MX31_PIN_RI_DCE1__GPIO2_10, MX31_PIN_DCD_DCE1__GPIO2_11,
};
static struct physmap_flash_data mx31moboard_flash_data = {
.width = 2,
};
static struct resource mx31moboard_flash_resource = {
.start = 0xa0000000,
.end = 0xa1ffffff,
.flags = IORESOURCE_MEM,
};
static struct platform_device mx31moboard_flash = {
.name = "physmap-flash",
.id = 0,
.dev = {
.platform_data = &mx31moboard_flash_data,
},
.resource = &mx31moboard_flash_resource,
.num_resources = 1,
};
static int moboard_uart0_init(struct platform_device *pdev)
{
gpio_request(IOMUX_TO_GPIO(MX31_PIN_CTS1), "uart0-cts-hack");
gpio_direction_output(IOMUX_TO_GPIO(MX31_PIN_CTS1), 0);
return 0;
}
static struct imxuart_platform_data uart0_pdata = {
.init = moboard_uart0_init,
};
static struct imxuart_platform_data uart4_pdata = {
.flags = IMXUART_HAVE_RTSCTS,
};
static struct imxi2c_platform_data moboard_i2c0_pdata = {
.bitrate = 400000,
};
static struct imxi2c_platform_data moboard_i2c1_pdata = {
.bitrate = 100000,
};
#define SDHC1_CD IOMUX_TO_GPIO(MX31_PIN_ATA_CS0)
#define SDHC1_WP IOMUX_TO_GPIO(MX31_PIN_ATA_CS1)
static int moboard_sdhc1_get_ro(struct device *dev)
{
return !gpio_get_value(SDHC1_WP);
}
static int moboard_sdhc1_init(struct device *dev, irq_handler_t detect_irq,
void *data)
{
int ret;
ret = gpio_request(SDHC1_CD, "sdhc-detect");
if (ret)
return ret;
gpio_direction_input(SDHC1_CD);
ret = gpio_request(SDHC1_WP, "sdhc-wp");
if (ret)
goto err_gpio_free;
gpio_direction_input(SDHC1_WP);
ret = request_irq(gpio_to_irq(SDHC1_CD), detect_irq,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
"sdhc1-card-detect", data);
if (ret)
goto err_gpio_free_2;
return 0;
err_gpio_free_2:
gpio_free(SDHC1_WP);
err_gpio_free:
gpio_free(SDHC1_CD);
return ret;
}
static void moboard_sdhc1_exit(struct device *dev, void *data)
{
free_irq(gpio_to_irq(SDHC1_CD), data);
gpio_free(SDHC1_WP);
gpio_free(SDHC1_CD);
}
static struct imxmmc_platform_data sdhc1_pdata = {
.get_ro = moboard_sdhc1_get_ro,
.init = moboard_sdhc1_init,
.exit = moboard_sdhc1_exit,
};
/*
* this pin is dedicated for all mx31moboard systems, so we do it here
*/
#define USB_RESET_B IOMUX_TO_GPIO(MX31_PIN_GPIO1_0)
static void usb_xcvr_reset(void)
{
gpio_request(USB_RESET_B, "usb-reset");
gpio_direction_output(USB_RESET_B, 0);
mdelay(1);
gpio_set_value(USB_RESET_B, 1);
}
#define USB_PAD_CFG (PAD_CTL_DRV_MAX | PAD_CTL_SRE_FAST | PAD_CTL_HYS_CMOS | \
PAD_CTL_ODE_CMOS | PAD_CTL_100K_PU)
#define OTG_EN_B IOMUX_TO_GPIO(MX31_PIN_USB_OC)
static void moboard_usbotg_init(void)
{
mxc_iomux_set_pad(MX31_PIN_USBOTG_DATA0, USB_PAD_CFG);
mxc_iomux_set_pad(MX31_PIN_USBOTG_DATA1, USB_PAD_CFG);
mxc_iomux_set_pad(MX31_PIN_USBOTG_DATA2, USB_PAD_CFG);
mxc_iomux_set_pad(MX31_PIN_USBOTG_DATA3, USB_PAD_CFG);
mxc_iomux_set_pad(MX31_PIN_USBOTG_DATA4, USB_PAD_CFG);
mxc_iomux_set_pad(MX31_PIN_USBOTG_DATA5, USB_PAD_CFG);
mxc_iomux_set_pad(MX31_PIN_USBOTG_DATA6, USB_PAD_CFG);
mxc_iomux_set_pad(MX31_PIN_USBOTG_DATA7, USB_PAD_CFG);
mxc_iomux_set_pad(MX31_PIN_USBOTG_CLK, USB_PAD_CFG);
mxc_iomux_set_pad(MX31_PIN_USBOTG_DIR, USB_PAD_CFG);
mxc_iomux_set_pad(MX31_PIN_USBOTG_NXT, USB_PAD_CFG);
mxc_iomux_set_pad(MX31_PIN_USBOTG_STP, USB_PAD_CFG);
gpio_request(OTG_EN_B, "usb-udc-en");
gpio_direction_output(OTG_EN_B, 0);
}
static struct fsl_usb2_platform_data usb_pdata = {
.operating_mode = FSL_USB2_DR_DEVICE,
.phy_mode = FSL_USB2_PHY_ULPI,
};
static struct gpio_led mx31moboard_leds[] = {
{
.name = "coreboard-led-0:red:running",
.default_trigger = "heartbeat",
.gpio = IOMUX_TO_GPIO(MX31_PIN_SVEN0),
}, {
.name = "coreboard-led-1:red",
.gpio = IOMUX_TO_GPIO(MX31_PIN_STX0),
}, {
.name = "coreboard-led-2:red",
.gpio = IOMUX_TO_GPIO(MX31_PIN_SRX0),
}, {
.name = "coreboard-led-3:red",
.gpio = IOMUX_TO_GPIO(MX31_PIN_SIMPD0),
},
};
static struct gpio_led_platform_data mx31moboard_led_pdata = {
.num_leds = ARRAY_SIZE(mx31moboard_leds),
.leds = mx31moboard_leds,
};
static struct platform_device mx31moboard_leds_device = {
.name = "leds-gpio",
.id = -1,
.dev = {
.platform_data = &mx31moboard_led_pdata,
},
};
#define SEL0 IOMUX_TO_GPIO(MX31_PIN_DTR_DCE1)
#define SEL1 IOMUX_TO_GPIO(MX31_PIN_DSR_DCE1)
#define SEL2 IOMUX_TO_GPIO(MX31_PIN_RI_DCE1)
#define SEL3 IOMUX_TO_GPIO(MX31_PIN_DCD_DCE1)
static void mx31moboard_init_sel_gpios(void)
{
if (!gpio_request(SEL0, "sel0")) {
gpio_direction_input(SEL0);
gpio_export(SEL0, true);
}
if (!gpio_request(SEL1, "sel1")) {
gpio_direction_input(SEL1);
gpio_export(SEL1, true);
}
if (!gpio_request(SEL2, "sel2")) {
gpio_direction_input(SEL2);
gpio_export(SEL2, true);
}
if (!gpio_request(SEL3, "sel3")) {
gpio_direction_input(SEL3);
gpio_export(SEL3, true);
}
}
static struct platform_device *devices[] __initdata = {
&mx31moboard_flash,
&mx31moboard_leds_device,
};
static int mx31moboard_baseboard;
core_param(mx31moboard_baseboard, mx31moboard_baseboard, int, 0444);
/*
* Board specific initialization.
*/
static void __init mxc_board_init(void)
{
mxc_iomux_setup_multiple_pins(moboard_pins, ARRAY_SIZE(moboard_pins),
"moboard");
platform_add_devices(devices, ARRAY_SIZE(devices));
mxc_register_device(&mxc_uart_device0, &uart0_pdata);
mxc_register_device(&mxc_uart_device4, &uart4_pdata);
mx31moboard_init_sel_gpios();
mxc_register_device(&mxc_i2c_device0, &moboard_i2c0_pdata);
mxc_register_device(&mxc_i2c_device1, &moboard_i2c1_pdata);
mxc_register_device(&mxcsdhc_device0, &sdhc1_pdata);
usb_xcvr_reset();
moboard_usbotg_init();
mxc_register_device(&mxc_otg_udc_device, &usb_pdata);
switch (mx31moboard_baseboard) {
case MX31NOBOARD:
break;
case MX31DEVBOARD:
mx31moboard_devboard_init();
break;
case MX31MARXBOT:
mx31moboard_marxbot_init();
break;
default:
printk(KERN_ERR "Illegal mx31moboard_baseboard type %d\n",
mx31moboard_baseboard);
}
}
static void __init mx31moboard_timer_init(void)
{
mx31_clocks_init(26000000);
}
struct sys_timer mx31moboard_timer = {
.init = mx31moboard_timer_init,
};
MACHINE_START(MX31MOBOARD, "EPFL Mobots mx31moboard")
/* Maintainer: Valentin Longchamp, EPFL Mobots group */
.phys_io = AIPS1_BASE_ADDR,
.io_pg_offst = ((AIPS1_BASE_ADDR_VIRT) >> 18) & 0xfffc,
.boot_params = PHYS_OFFSET + 0x100,
.map_io = mx31_map_io,
.init_irq = mx31_init_irq,
.init_machine = mxc_board_init,
.timer = &mx31moboard_timer,
MACHINE_END
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