android_kernel_motorola_sm6225/arch/arm/mach-pxa/gumstix.c
Russell King cc155c6f2c [ARM] pxa: allow platforms to control which uarts are registered
For some platforms, it is inappropriate to register all PXA UARTs.
In some cases, the UARTs may not be used, and in others we may want
to avoid registering the UARTs to allow other drivers (eg, FICP) to
make use of the UART.

In addition, a while back there was a request to be able to pass
platform data to the UART driver.

This patch enables all of this by providing functions platforms can
call to register each individual UART.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Mike Rapoport <mike@compulab.co.il>
Acked-by: Robert Jarzmik <robert.jarzmik@free.fr>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
2009-12-01 09:02:55 +08:00

234 lines
4.9 KiB
C

/*
* linux/arch/arm/mach-pxa/gumstix.c
*
* Support for the Gumstix motherboards.
*
* Original Author: Craig Hughes
* Created: Feb 14, 2008
* Copyright: Craig Hughes
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Implemented based on lubbock.c by Nicolas Pitre and code from Craig
* Hughes
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/gpio.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <asm/setup.h>
#include <asm/memory.h>
#include <asm/mach-types.h>
#include <mach/hardware.h>
#include <asm/irq.h>
#include <asm/sizes.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <asm/mach/irq.h>
#include <asm/mach/flash.h>
#include <mach/pxa25x.h>
#include <mach/mmc.h>
#include <mach/udc.h>
#include <mach/gumstix.h>
#include "generic.h"
static struct resource flash_resource = {
.start = 0x00000000,
.end = SZ_64M - 1,
.flags = IORESOURCE_MEM,
};
static struct mtd_partition gumstix_partitions[] = {
{
.name = "Bootloader",
.size = 0x00040000,
.offset = 0,
.mask_flags = MTD_WRITEABLE /* force read-only */
} , {
.name = "rootfs",
.size = MTDPART_SIZ_FULL,
.offset = MTDPART_OFS_APPEND
}
};
static struct flash_platform_data gumstix_flash_data = {
.map_name = "cfi_probe",
.parts = gumstix_partitions,
.nr_parts = ARRAY_SIZE(gumstix_partitions),
.width = 2,
};
static struct platform_device gumstix_flash_device = {
.name = "pxa2xx-flash",
.id = 0,
.dev = {
.platform_data = &gumstix_flash_data,
},
.resource = &flash_resource,
.num_resources = 1,
};
static struct platform_device *devices[] __initdata = {
&gumstix_flash_device,
};
#ifdef CONFIG_MMC_PXA
static struct pxamci_platform_data gumstix_mci_platform_data = {
.ocr_mask = MMC_VDD_32_33|MMC_VDD_33_34,
.gpio_card_detect = -1,
.gpio_card_ro = -1,
.gpio_power = -1,
};
static void __init gumstix_mmc_init(void)
{
pxa_set_mci_info(&gumstix_mci_platform_data);
}
#else
static void __init gumstix_mmc_init(void)
{
pr_debug("Gumstix mmc disabled\n");
}
#endif
#ifdef CONFIG_USB_GADGET_PXA25X
static struct pxa2xx_udc_mach_info gumstix_udc_info __initdata = {
.gpio_vbus = GPIO_GUMSTIX_USB_GPIOn,
.gpio_pullup = GPIO_GUMSTIX_USB_GPIOx,
};
static void __init gumstix_udc_init(void)
{
pxa_set_udc_info(&gumstix_udc_info);
}
#else
static void gumstix_udc_init(void)
{
pr_debug("Gumstix udc is disabled\n");
}
#endif
#ifdef CONFIG_BT
/* Normally, the bootloader would have enabled this 32kHz clock but many
** boards still have u-boot 1.1.4 so we check if it has been turned on and
** if not, we turn it on with a warning message. */
static void gumstix_setup_bt_clock(void)
{
int timeout = 500;
if (!(OSCC & OSCC_OOK))
pr_warning("32kHz clock was not on. Bootloader may need to "
"be updated\n");
else
return;
OSCC |= OSCC_OON;
do {
if (OSCC & OSCC_OOK)
break;
udelay(1);
} while (--timeout);
if (!timeout)
pr_err("Failed to start 32kHz clock\n");
}
static void __init gumstix_bluetooth_init(void)
{
int err;
gumstix_setup_bt_clock();
err = gpio_request(GPIO_GUMSTIX_BTRESET, "BTRST");
if (err) {
pr_err("gumstix: failed request gpio for bluetooth reset\n");
return;
}
err = gpio_direction_output(GPIO_GUMSTIX_BTRESET, 1);
if (err) {
pr_err("gumstix: can't reset bluetooth\n");
return;
}
gpio_set_value(GPIO_GUMSTIX_BTRESET, 0);
udelay(100);
gpio_set_value(GPIO_GUMSTIX_BTRESET, 1);
}
#else
static void gumstix_bluetooth_init(void)
{
pr_debug("Gumstix Bluetooth is disabled\n");
}
#endif
static unsigned long gumstix_pin_config[] __initdata = {
GPIO12_32KHz,
/* BTUART */
GPIO42_HWUART_RXD,
GPIO43_HWUART_TXD,
GPIO44_HWUART_CTS,
GPIO45_HWUART_RTS,
/* MMC */
GPIO6_MMC_CLK,
GPIO53_MMC_CLK,
GPIO8_MMC_CS0,
};
int __attribute__((weak)) am200_init(void)
{
return 0;
}
int __attribute__((weak)) am300_init(void)
{
return 0;
}
static void __init carrier_board_init(void)
{
/*
* put carrier/expansion board init here if
* they cannot be detected programatically
*/
am200_init();
am300_init();
}
static void __init gumstix_init(void)
{
pxa2xx_mfp_config(ARRAY_AND_SIZE(gumstix_pin_config));
pxa_set_ffuart_info(NULL);
pxa_set_btuart_info(NULL);
pxa_set_stuart_info(NULL);
pxa_set_hwuart_info(NULL);
gumstix_bluetooth_init();
gumstix_udc_init();
gumstix_mmc_init();
(void) platform_add_devices(devices, ARRAY_SIZE(devices));
carrier_board_init();
}
MACHINE_START(GUMSTIX, "Gumstix")
.phys_io = 0x40000000,
.boot_params = 0xa0000100, /* match u-boot bi_boot_params */
.io_pg_offst = (io_p2v(0x40000000) >> 18) & 0xfffc,
.map_io = pxa_map_io,
.init_irq = pxa25x_init_irq,
.timer = &pxa_timer,
.init_machine = gumstix_init,
MACHINE_END