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linux/arch/arm/mach-omap2/board-rx51.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-rx51.c
*
* Copyright (C) 2007, 2008 Nokia
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/leds.h>
#include <mach/hardware.h>
#include <asm/mach-types.h>
#include <asm/mach/arch.h>
#include <asm/mach/map.h>
#include <plat/mcspi.h>
#include <plat/board.h>
#include <plat/common.h>
#include <plat/dma.h>
#include <plat/gpmc.h>
#include <plat/usb.h>
#include "mux.h"
#include "pm.h"
#define RX51_GPIO_SLEEP_IND 162
struct omap_sdrc_params *rx51_get_sdram_timings(void);
extern void rx51_video_mem_init(void);
static struct gpio_led gpio_leds[] = {
{
.name = "sleep_ind",
.gpio = RX51_GPIO_SLEEP_IND,
},
};
static struct gpio_led_platform_data gpio_led_info = {
.leds = gpio_leds,
.num_leds = ARRAY_SIZE(gpio_leds),
};
static struct platform_device leds_gpio = {
.name = "leds-gpio",
.id = -1,
.dev = {
.platform_data = &gpio_led_info,
},
};
static struct cpuidle_params rx51_cpuidle_params[] = {
/* C1 */
{1, 110, 162, 5},
/* C2 */
{1, 106, 180, 309},
/* C3 */
{0, 107, 410, 46057},
/* C4 */
{0, 121, 3374, 46057},
/* C5 */
{1, 855, 1146, 46057},
/* C6 */
{0, 7580, 4134, 484329},
/* C7 */
{1, 7505, 15274, 484329},
};
static struct omap_lcd_config rx51_lcd_config = {
.ctrl_name = "internal",
};
static struct omap_fbmem_config rx51_fbmem0_config = {
.size = 752 * 1024,
};
static struct omap_fbmem_config rx51_fbmem1_config = {
.size = 752 * 1024,
};
static struct omap_fbmem_config rx51_fbmem2_config = {
.size = 752 * 1024,
};
static struct omap_board_config_kernel rx51_config[] = {
{ OMAP_TAG_FBMEM, &rx51_fbmem0_config },
{ OMAP_TAG_FBMEM, &rx51_fbmem1_config },
{ OMAP_TAG_FBMEM, &rx51_fbmem2_config },
{ OMAP_TAG_LCD, &rx51_lcd_config },
};
static void __init rx51_init_irq(void)
{
struct omap_sdrc_params *sdrc_params;
omap_board_config = rx51_config;
omap_board_config_size = ARRAY_SIZE(rx51_config);
omap3_pm_init_cpuidle(rx51_cpuidle_params);
sdrc_params = rx51_get_sdram_timings();
omap2_init_common_hw(sdrc_params, sdrc_params);
omap_init_irq();
}
extern void __init rx51_peripherals_init(void);
#ifdef CONFIG_OMAP_MUX
static struct omap_board_mux board_mux[] __initdata = {
{ .reg_offset = OMAP_MUX_TERMINATOR },
};
#else
#define board_mux NULL
#endif
static struct omap_musb_board_data musb_board_data = {
.interface_type = MUSB_INTERFACE_ULPI,
.mode = MUSB_PERIPHERAL,
.power = 0,
};
static void __init rx51_init(void)
{
omap3_mux_init(board_mux, OMAP_PACKAGE_CBB);
omap_serial_init();
usb_musb_init(&musb_board_data);
rx51_peripherals_init();
/* Ensure SDRC pins are mux'd for self-refresh */
omap_mux_init_signal("sdrc_cke0", OMAP_PIN_OUTPUT);
omap_mux_init_signal("sdrc_cke1", OMAP_PIN_OUTPUT);
platform_device_register(&leds_gpio);
}
static void __init rx51_map_io(void)
{
omap2_set_globals_3xxx();
rx51_video_mem_init();
omap34xx_map_common_io();
}
MACHINE_START(NOKIA_RX51, "Nokia RX-51 board")
/* Maintainer: Lauri Leukkunen <lauri.leukkunen@nokia.com> */
.boot_params = 0x80000100,
.map_io = rx51_map_io,
.reserve = omap_reserve,
.init_irq = rx51_init_irq,
.init_machine = rx51_init,
.timer = &omap_timer,
MACHINE_END
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