c6a81316c7
An upcoming Overo expansion board includes an ADS7846 touchscreen controller. This patch adds support via the ads7846 driver when enabled in the kernel config. Signed-off-by: Steve Sakoman <steve@sakoman.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
354 lines
8.9 KiB
C
354 lines
8.9 KiB
C
/*
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* board-overo.c (Gumstix Overo)
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*
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* Initial code: Steve Sakoman <steve@sakoman.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/i2c/twl4030.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/nand.h>
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#include <linux/mtd/partitions.h>
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#include <asm/mach-types.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/flash.h>
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#include <asm/mach/map.h>
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#include <mach/board.h>
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#include <mach/common.h>
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#include <mach/gpio.h>
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#include <mach/gpmc.h>
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#include <mach/hardware.h>
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#include <mach/nand.h>
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#include <mach/usb.h>
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#include "mmc-twl4030.h"
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#define OVERO_GPIO_BT_XGATE 15
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#define OVERO_GPIO_W2W_NRESET 16
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#define OVERO_GPIO_BT_NRESET 164
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#define OVERO_GPIO_USBH_CPEN 168
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#define OVERO_GPIO_USBH_NRESET 183
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#define NAND_BLOCK_SIZE SZ_128K
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#define GPMC_CS0_BASE 0x60
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#define GPMC_CS_SIZE 0x30
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#if defined(CONFIG_TOUCHSCREEN_ADS7846) || \
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defined(CONFIG_TOUCHSCREEN_ADS7846_MODULE)
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#include <mach/mcspi.h>
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#include <linux/spi/spi.h>
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#include <linux/spi/ads7846.h>
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static struct omap2_mcspi_device_config ads7846_mcspi_config = {
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.turbo_mode = 0,
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.single_channel = 1, /* 0: slave, 1: master */
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};
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static int ads7846_get_pendown_state(void)
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{
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return !gpio_get_value(OVERO_GPIO_PENDOWN);
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}
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static struct ads7846_platform_data ads7846_config = {
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.x_max = 0x0fff,
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.y_max = 0x0fff,
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.x_plate_ohms = 180,
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.pressure_max = 255,
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.debounce_max = 10,
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.debounce_tol = 3,
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.debounce_rep = 1,
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.get_pendown_state = ads7846_get_pendown_state,
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.keep_vref_on = 1,
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};
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static struct spi_board_info overo_spi_board_info[] __initdata = {
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{
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.modalias = "ads7846",
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.bus_num = 1,
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.chip_select = 0,
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.max_speed_hz = 1500000,
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.controller_data = &ads7846_mcspi_config,
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.irq = OMAP_GPIO_IRQ(OVERO_GPIO_PENDOWN),
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.platform_data = &ads7846_config,
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}
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};
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static void __init overo_ads7846_init(void)
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{
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if ((gpio_request(OVERO_GPIO_PENDOWN, "ADS7846_PENDOWN") == 0) &&
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(gpio_direction_input(OVERO_GPIO_PENDOWN) == 0)) {
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gpio_export(OVERO_GPIO_PENDOWN, 0);
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} else {
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printk(KERN_ERR "could not obtain gpio for ADS7846_PENDOWN\n");
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return;
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}
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spi_register_board_info(overo_spi_board_info,
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ARRAY_SIZE(overo_spi_board_info));
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}
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#else
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static inline void __init overo_ads7846_init(void) { return; }
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#endif
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static struct mtd_partition overo_nand_partitions[] = {
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{
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.name = "xloader",
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.offset = 0, /* Offset = 0x00000 */
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.size = 4 * NAND_BLOCK_SIZE,
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.mask_flags = MTD_WRITEABLE
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},
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{
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.name = "uboot",
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.offset = MTDPART_OFS_APPEND, /* Offset = 0x80000 */
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.size = 14 * NAND_BLOCK_SIZE,
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},
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{
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.name = "uboot environment",
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.offset = MTDPART_OFS_APPEND, /* Offset = 0x240000 */
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.size = 2 * NAND_BLOCK_SIZE,
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},
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{
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.name = "linux",
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.offset = MTDPART_OFS_APPEND, /* Offset = 0x280000 */
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.size = 32 * NAND_BLOCK_SIZE,
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},
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{
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.name = "rootfs",
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.offset = MTDPART_OFS_APPEND, /* Offset = 0x680000 */
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.size = MTDPART_SIZ_FULL,
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},
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};
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static struct omap_nand_platform_data overo_nand_data = {
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.parts = overo_nand_partitions,
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.nr_parts = ARRAY_SIZE(overo_nand_partitions),
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.dma_channel = -1, /* disable DMA in OMAP NAND driver */
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};
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static struct resource overo_nand_resource = {
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.flags = IORESOURCE_MEM,
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};
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static struct platform_device overo_nand_device = {
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.name = "omap2-nand",
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.id = -1,
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.dev = {
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.platform_data = &overo_nand_data,
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},
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.num_resources = 1,
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.resource = &overo_nand_resource,
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};
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static void __init overo_flash_init(void)
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{
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u8 cs = 0;
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u8 nandcs = GPMC_CS_NUM + 1;
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u32 gpmc_base_add = OMAP34XX_GPMC_VIRT;
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/* find out the chip-select on which NAND exists */
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while (cs < GPMC_CS_NUM) {
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u32 ret = 0;
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ret = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG1);
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if ((ret & 0xC00) == 0x800) {
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printk(KERN_INFO "Found NAND on CS%d\n", cs);
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if (nandcs > GPMC_CS_NUM)
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nandcs = cs;
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}
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cs++;
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}
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if (nandcs > GPMC_CS_NUM) {
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printk(KERN_INFO "NAND: Unable to find configuration "
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"in GPMC\n ");
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return;
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}
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if (nandcs < GPMC_CS_NUM) {
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overo_nand_data.cs = nandcs;
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overo_nand_data.gpmc_cs_baseaddr = (void *)
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(gpmc_base_add + GPMC_CS0_BASE + nandcs * GPMC_CS_SIZE);
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overo_nand_data.gpmc_baseaddr = (void *) (gpmc_base_add);
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printk(KERN_INFO "Registering NAND on CS%d\n", nandcs);
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if (platform_device_register(&overo_nand_device) < 0)
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printk(KERN_ERR "Unable to register NAND device\n");
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}
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}
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static struct omap_uart_config overo_uart_config __initdata = {
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.enabled_uarts = ((1 << 0) | (1 << 1) | (1 << 2)),
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};
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static struct twl4030_gpio_platform_data overo_gpio_data = {
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.gpio_base = OMAP_MAX_GPIO_LINES,
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.irq_base = TWL4030_GPIO_IRQ_BASE,
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.irq_end = TWL4030_GPIO_IRQ_END,
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};
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static struct twl4030_platform_data overo_twldata = {
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.irq_base = TWL4030_IRQ_BASE,
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.irq_end = TWL4030_IRQ_END,
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.gpio = &overo_gpio_data,
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};
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static struct i2c_board_info __initdata overo_i2c_boardinfo[] = {
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{
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I2C_BOARD_INFO("twl4030", 0x48),
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.flags = I2C_CLIENT_WAKE,
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.irq = INT_34XX_SYS_NIRQ,
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.platform_data = &overo_twldata,
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},
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};
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static int __init overo_i2c_init(void)
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{
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omap_register_i2c_bus(1, 2600, overo_i2c_boardinfo,
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ARRAY_SIZE(overo_i2c_boardinfo));
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/* i2c2 pins are used for gpio */
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omap_register_i2c_bus(3, 400, NULL, 0);
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return 0;
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}
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static void __init overo_init_irq(void)
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{
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omap2_init_common_hw();
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omap_init_irq();
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omap_gpio_init();
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}
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static struct platform_device overo_lcd_device = {
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.name = "overo_lcd",
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.id = -1,
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};
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static struct omap_lcd_config overo_lcd_config __initdata = {
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.ctrl_name = "internal",
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};
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static struct omap_board_config_kernel overo_config[] __initdata = {
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{ OMAP_TAG_UART, &overo_uart_config },
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{ OMAP_TAG_LCD, &overo_lcd_config },
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};
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static struct platform_device *overo_devices[] __initdata = {
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&overo_lcd_device,
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};
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static struct twl4030_hsmmc_info mmc[] __initdata = {
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{
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.mmc = 1,
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.wires = 4,
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.gpio_cd = -EINVAL,
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.gpio_wp = -EINVAL,
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},
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{
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.mmc = 2,
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.wires = 4,
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.gpio_cd = -EINVAL,
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.gpio_wp = -EINVAL,
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.transceiver = true,
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},
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{} /* Terminator */
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};
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static void __init overo_init(void)
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{
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overo_i2c_init();
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platform_add_devices(overo_devices, ARRAY_SIZE(overo_devices));
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omap_board_config = overo_config;
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omap_board_config_size = ARRAY_SIZE(overo_config);
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omap_serial_init();
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twl4030_mmc_init(mmc);
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overo_flash_init();
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usb_musb_init();
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overo_ads7846_init();
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if ((gpio_request(OVERO_GPIO_W2W_NRESET,
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"OVERO_GPIO_W2W_NRESET") == 0) &&
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(gpio_direction_output(OVERO_GPIO_W2W_NRESET, 1) == 0)) {
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gpio_export(OVERO_GPIO_W2W_NRESET, 0);
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gpio_set_value(OVERO_GPIO_W2W_NRESET, 0);
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udelay(10);
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gpio_set_value(OVERO_GPIO_W2W_NRESET, 1);
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} else {
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printk(KERN_ERR "could not obtain gpio for "
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"OVERO_GPIO_W2W_NRESET\n");
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}
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if ((gpio_request(OVERO_GPIO_BT_XGATE, "OVERO_GPIO_BT_XGATE") == 0) &&
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(gpio_direction_output(OVERO_GPIO_BT_XGATE, 0) == 0))
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gpio_export(OVERO_GPIO_BT_XGATE, 0);
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else
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printk(KERN_ERR "could not obtain gpio for OVERO_GPIO_BT_XGATE\n");
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if ((gpio_request(OVERO_GPIO_BT_NRESET, "OVERO_GPIO_BT_NRESET") == 0) &&
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(gpio_direction_output(OVERO_GPIO_BT_NRESET, 1) == 0)) {
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gpio_export(OVERO_GPIO_BT_NRESET, 0);
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gpio_set_value(OVERO_GPIO_BT_NRESET, 0);
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mdelay(6);
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gpio_set_value(OVERO_GPIO_BT_NRESET, 1);
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} else {
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printk(KERN_ERR "could not obtain gpio for "
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"OVERO_GPIO_BT_NRESET\n");
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}
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if ((gpio_request(OVERO_GPIO_USBH_CPEN, "OVERO_GPIO_USBH_CPEN") == 0) &&
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(gpio_direction_output(OVERO_GPIO_USBH_CPEN, 1) == 0))
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gpio_export(OVERO_GPIO_USBH_CPEN, 0);
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else
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printk(KERN_ERR "could not obtain gpio for "
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"OVERO_GPIO_USBH_CPEN\n");
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if ((gpio_request(OVERO_GPIO_USBH_NRESET,
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"OVERO_GPIO_USBH_NRESET") == 0) &&
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(gpio_direction_output(OVERO_GPIO_USBH_NRESET, 1) == 0))
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gpio_export(OVERO_GPIO_USBH_NRESET, 0);
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else
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printk(KERN_ERR "could not obtain gpio for "
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"OVERO_GPIO_USBH_NRESET\n");
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}
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static void __init overo_map_io(void)
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{
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omap2_set_globals_343x();
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omap2_map_common_io();
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}
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MACHINE_START(OVERO, "Gumstix Overo")
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.phys_io = 0x48000000,
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.io_pg_offst = ((0xd8000000) >> 18) & 0xfffc,
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.boot_params = 0x80000100,
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.map_io = overo_map_io,
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.init_irq = overo_init_irq,
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.init_machine = overo_init,
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.timer = &omap_timer,
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MACHINE_END
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