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alistair23-linux/arch/arm/mach-omap2/board-cm-t3517.c
Varadarajan, Charulatha 77640aabd7 OMAP: GPIO: Implement GPIO as a platform device 
Implement GPIO as a platform device.

GPIO APIs are used in machine_init functions. Hence it is
required to complete GPIO probe before board_init. Therefore
GPIO device register and driver register are implemented as
postcore_initcalls.

omap_gpio_init() does nothing now and this function would be
removed in the next patch as it's usage is spread across most
of the board files.

Inorder to convert GPIO as platform device, modifications are
required in clockxxxx_data.c file for OMAP1 so that device names
can be used to obtain clock instead of getting clocks by
name/NULL ptr.

Use runtime pm APIs (pm_runtime_put*/pm_runtime_get*) for enabling
or disabling the clocks, modify sysconfig settings and remove usage
of clock FW APIs.
Note 1: Converting GPIO driver to use runtime PM APIs is not done as a
separate patch because GPIO clock names are different for various OMAPs
and are different for some of the banks in the same CPU. This would need
usage of cpu_is checks and bank id checks while using clock FW APIs in
the gpio driver. Hence while making GPIO a platform driver framework,
PM runtime APIs are used directly.

Note 2: While implementing GPIO as a platform device, pm runtime APIs
are used as mentioned above and modification is not done in gpio's
prepare for idle/ resume after idle functions. This would be done
in the next patch series and GPIO driver would be made to use dev_pm_ops
instead of sysdev_class in that series only.

Due to the above, the GPIO driver implicitly relies on
CM_AUTOIDLE = 1 on its iclk for power management to work, since the
driver never disables its iclk.
This would be taken care in the next patch series (see Note 3 below).

Refer to
http://www.mail-archive.com/linux-omap@vger.kernel.org/msg39112.html
for more details.

Note 3: only pm_runtime_get_sync is called in gpio's probe() and
pm_runtime_put* is never called. This is to make the implementation
similar to the existing GPIO code. Another patch series would be sent
to correct this.

In OMAP3 and OMAP4 gpio's debounce clocks are optional clocks. They
are enabled/ disabled whenever required using clock framework APIs

TODO:
1. Cleanup the GPIO driver. Use function pointers and register
offest pointers instead of using hardcoded values
2. Remove all cpu_is_ checks and OMAP specific macros
3. Remove usage of gpio_bank array so that only
   instance specific information is used in driver code
4. Rename 'method'/ avoid it's usage
5. Fix the non-wakeup gpios handling for OMAP2430, OMAP3 & OMAP4
6. Modify gpio's prepare for idle/ resume after idle functions
   to use runtime pm implentation.

Signed-off-by: Charulatha V <charu@ti.com>
Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Reviewed-by: Basak, Partha <p-basak2@ti.com>
Acked-by: Kevin Hilman <khilman@deeprootsystems.com>
[tony@atomide.com: updated for bank specific revision and updated boards]
Signed-off-by: Tony Lindgren <tony@atomide.com>
2010-12-07 16:26:57 -08:00

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/*
* linux/arch/arm/mach-omap2/board-cm-t3517.c
*
* Support for the CompuLab CM-T3517 modules
*
* Copyright (C) 2010 CompuLab, Ltd.
* Author: Igor Grinberg <grinberg@compulab.co.il>
*
* 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.
*
* 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., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/leds.h>
#include <linux/rtc-v3020.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/partitions.h>
#include <linux/can/platform/ti_hecc.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <plat/board.h>
#include <plat/common.h>
#include <plat/usb.h>
#include <plat/nand.h>
#include <plat/gpmc.h>
#include <mach/am35xx.h>
#include "mux.h"
#include "control.h"
#if defined(CONFIG_LEDS_GPIO) || defined(CONFIG_LEDS_GPIO_MODULE)
static struct gpio_led cm_t3517_leds[] = {
[0] = {
.gpio = 186,
.name = "cm-t3517:green",
.default_trigger = "heartbeat",
.active_low = 0,
},
};
static struct gpio_led_platform_data cm_t3517_led_pdata = {
.num_leds = ARRAY_SIZE(cm_t3517_leds),
.leds = cm_t3517_leds,
};
static struct platform_device cm_t3517_led_device = {
.name = "leds-gpio",
.id = -1,
.dev = {
.platform_data = &cm_t3517_led_pdata,
},
};
static void __init cm_t3517_init_leds(void)
{
platform_device_register(&cm_t3517_led_device);
}
#else
static inline void cm_t3517_init_leds(void) {}
#endif
#if defined(CONFIG_CAN_TI_HECC) || defined(CONFIG_CAN_TI_HECC_MODULE)
static struct resource cm_t3517_hecc_resources[] = {
{
.start = AM35XX_IPSS_HECC_BASE,
.end = AM35XX_IPSS_HECC_BASE + SZ_16K - 1,
.flags = IORESOURCE_MEM,
},
{
.start = INT_35XX_HECC0_IRQ,
.end = INT_35XX_HECC0_IRQ,
.flags = IORESOURCE_IRQ,
},
};
static struct ti_hecc_platform_data cm_t3517_hecc_pdata = {
.scc_hecc_offset = AM35XX_HECC_SCC_HECC_OFFSET,
.scc_ram_offset = AM35XX_HECC_SCC_RAM_OFFSET,
.hecc_ram_offset = AM35XX_HECC_RAM_OFFSET,
.mbx_offset = AM35XX_HECC_MBOX_OFFSET,
.int_line = AM35XX_HECC_INT_LINE,
.version = AM35XX_HECC_VERSION,
};
static struct platform_device cm_t3517_hecc_device = {
.name = "ti_hecc",
.id = 1,
.num_resources = ARRAY_SIZE(cm_t3517_hecc_resources),
.resource = cm_t3517_hecc_resources,
.dev = {
.platform_data = &cm_t3517_hecc_pdata,
},
};
static void cm_t3517_init_hecc(void)
{
platform_device_register(&cm_t3517_hecc_device);
}
#else
static inline void cm_t3517_init_hecc(void) {}
#endif
#if defined(CONFIG_RTC_DRV_V3020) || defined(CONFIG_RTC_DRV_V3020_MODULE)
#define RTC_IO_GPIO (153)
#define RTC_WR_GPIO (154)
#define RTC_RD_GPIO (160)
#define RTC_CS_GPIO (163)
struct v3020_platform_data cm_t3517_v3020_pdata = {
.use_gpio = 1,
.gpio_cs = RTC_CS_GPIO,
.gpio_wr = RTC_WR_GPIO,
.gpio_rd = RTC_RD_GPIO,
.gpio_io = RTC_IO_GPIO,
};
static struct platform_device cm_t3517_rtc_device = {
.name = "v3020",
.id = -1,
.dev = {
.platform_data = &cm_t3517_v3020_pdata,
}
};
static void __init cm_t3517_init_rtc(void)
{
platform_device_register(&cm_t3517_rtc_device);
}
#else
static inline void cm_t3517_init_rtc(void) {}
#endif
#if defined(CONFIG_USB_EHCI_HCD) || defined(CONFIG_USB_EHCI_HCD_MODULE)
#define HSUSB1_RESET_GPIO (146)
#define HSUSB2_RESET_GPIO (147)
#define USB_HUB_RESET_GPIO (152)
static struct ehci_hcd_omap_platform_data cm_t3517_ehci_pdata __initdata = {
.port_mode[0] = EHCI_HCD_OMAP_MODE_PHY,
.port_mode[1] = EHCI_HCD_OMAP_MODE_PHY,
.port_mode[2] = EHCI_HCD_OMAP_MODE_UNKNOWN,
.phy_reset = true,
.reset_gpio_port[0] = HSUSB1_RESET_GPIO,
.reset_gpio_port[1] = HSUSB2_RESET_GPIO,
.reset_gpio_port[2] = -EINVAL,
};
static int cm_t3517_init_usbh(void)
{
int err;
err = gpio_request(USB_HUB_RESET_GPIO, "usb hub rst");
if (err) {
pr_err("CM-T3517: usb hub rst gpio request failed: %d\n", err);
} else {
gpio_direction_output(USB_HUB_RESET_GPIO, 0);
udelay(10);
gpio_set_value(USB_HUB_RESET_GPIO, 1);
msleep(1);
}
usb_ehci_init(&cm_t3517_ehci_pdata);
return 0;
}
#else
static inline int cm_t3517_init_usbh(void)
{
return 0;
}
#endif
#if defined(CONFIG_MTD_NAND_OMAP2) || defined(CONFIG_MTD_NAND_OMAP2_MODULE)
#define NAND_BLOCK_SIZE SZ_128K
static struct mtd_partition cm_t3517_nand_partitions[] = {
{
.name = "xloader",
.offset = 0, /* Offset = 0x00000 */
.size = 4 * NAND_BLOCK_SIZE,
.mask_flags = MTD_WRITEABLE
},
{
.name = "uboot",
.offset = MTDPART_OFS_APPEND, /* Offset = 0x80000 */
.size = 15 * NAND_BLOCK_SIZE,
},
{
.name = "uboot environment",
.offset = MTDPART_OFS_APPEND, /* Offset = 0x260000 */
.size = 2 * NAND_BLOCK_SIZE,
},
{
.name = "linux",
.offset = MTDPART_OFS_APPEND, /* Offset = 0x280000 */
.size = 32 * NAND_BLOCK_SIZE,
},
{
.name = "rootfs",
.offset = MTDPART_OFS_APPEND, /* Offset = 0x680000 */
.size = MTDPART_SIZ_FULL,
},
};
static struct omap_nand_platform_data cm_t3517_nand_data = {
.parts = cm_t3517_nand_partitions,
.nr_parts = ARRAY_SIZE(cm_t3517_nand_partitions),
.dma_channel = -1, /* disable DMA in OMAP NAND driver */
.cs = 0,
};
static void __init cm_t3517_init_nand(void)
{
if (gpmc_nand_init(&cm_t3517_nand_data) < 0)
pr_err("CM-T3517: NAND initialization failed\n");
}
#else
static inline void cm_t3517_init_nand(void) {}
#endif
static struct omap_board_config_kernel cm_t3517_config[] __initdata = {
};
static void __init cm_t3517_init_irq(void)
{
omap_board_config = cm_t3517_config;
omap_board_config_size = ARRAY_SIZE(cm_t3517_config);
omap2_init_common_hw(NULL, NULL);
omap_init_irq();
}
static struct omap_board_mux board_mux[] __initdata = {
/* GPIO186 - Green LED */
OMAP3_MUX(SYS_CLKOUT2, OMAP_MUX_MODE4 | OMAP_PIN_OUTPUT),
/* RTC GPIOs: IO, WR#, RD#, CS# */
OMAP3_MUX(MCBSP4_DR, OMAP_MUX_MODE4 | OMAP_PIN_INPUT),
OMAP3_MUX(MCBSP4_DX, OMAP_MUX_MODE4 | OMAP_PIN_INPUT),
OMAP3_MUX(MCBSP_CLKS, OMAP_MUX_MODE4 | OMAP_PIN_INPUT),
OMAP3_MUX(UART3_CTS_RCTX, OMAP_MUX_MODE4 | OMAP_PIN_INPUT),
/* HSUSB1 RESET */
OMAP3_MUX(UART2_TX, OMAP_MUX_MODE4 | OMAP_PIN_OUTPUT),
/* HSUSB2 RESET */
OMAP3_MUX(UART2_RX, OMAP_MUX_MODE4 | OMAP_PIN_OUTPUT),
/* CM-T3517 USB HUB nRESET */
OMAP3_MUX(MCBSP4_CLKX, OMAP_MUX_MODE4 | OMAP_PIN_OUTPUT),
{ .reg_offset = OMAP_MUX_TERMINATOR },
};
static void __init cm_t3517_init(void)
{
omap3_mux_init(board_mux, OMAP_PACKAGE_CBB);
omap_serial_init();
cm_t3517_init_leds();
cm_t3517_init_nand();
cm_t3517_init_rtc();
cm_t3517_init_usbh();
cm_t3517_init_hecc();
}
MACHINE_START(CM_T3517, "Compulab CM-T3517")
.boot_params = 0x80000100,
.map_io = omap3_map_io,
.reserve = omap_reserve,
.init_irq = cm_t3517_init_irq,
.init_machine = cm_t3517_init,
.timer = &omap_timer,
MACHINE_END
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