linux/arch/arm/plat-samsung/pm-gpio.c
Kay Sievers edbaa603eb driver-core: remove sysdev.h usage.
The sysdev.h file should not be needed by any in-kernel code, so remove
the .h file from these random files that seem to still want to include
it.

The sysdev code will be going away soon, so this include needs to be
removed no matter what.

Cc: Jiandong Zheng <jdzheng@broadcom.com>
Cc: Scott Branden <sbranden@broadcom.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Kukjin Kim <kgene.kim@samsung.com>
Cc: David Brown <davidb@codeaurora.org>
Cc: Daniel Walker <dwalker@fifo99.com>
Cc: Bryan Huntsman <bryanh@codeaurora.org>
Cc: Ben Dooks <ben-linux@fluff.org>
Cc: Wan ZongShun <mcuos.com@gmail.com>
Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
Cc: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Cc: Guan Xuetao <gxt@mprc.pku.edu.cn>
Cc: "Venkatesh Pallipadi
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
2011-12-21 16:26:03 -08:00

385 lines
9.7 KiB
C

/* linux/arch/arm/plat-s3c/pm-gpio.c
*
* Copyright 2008 Openmoko, Inc.
* Copyright 2008 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
* http://armlinux.simtec.co.uk/
*
* S3C series GPIO PM code
*
* 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/device.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <plat/gpio-core.h>
#include <plat/pm.h>
/* PM GPIO helpers */
#define OFFS_CON (0x00)
#define OFFS_DAT (0x04)
#define OFFS_UP (0x08)
static void samsung_gpio_pm_1bit_save(struct samsung_gpio_chip *chip)
{
chip->pm_save[0] = __raw_readl(chip->base + OFFS_CON);
chip->pm_save[1] = __raw_readl(chip->base + OFFS_DAT);
}
static void samsung_gpio_pm_1bit_resume(struct samsung_gpio_chip *chip)
{
void __iomem *base = chip->base;
u32 old_gpcon = __raw_readl(base + OFFS_CON);
u32 old_gpdat = __raw_readl(base + OFFS_DAT);
u32 gps_gpcon = chip->pm_save[0];
u32 gps_gpdat = chip->pm_save[1];
u32 gpcon;
/* GPACON only has one bit per control / data and no PULLUPs.
* GPACON[x] = 0 => Output, 1 => SFN */
/* first set all SFN bits to SFN */
gpcon = old_gpcon | gps_gpcon;
__raw_writel(gpcon, base + OFFS_CON);
/* now set all the other bits */
__raw_writel(gps_gpdat, base + OFFS_DAT);
__raw_writel(gps_gpcon, base + OFFS_CON);
S3C_PMDBG("%s: CON %08x => %08x, DAT %08x => %08x\n",
chip->chip.label, old_gpcon, gps_gpcon, old_gpdat, gps_gpdat);
}
struct samsung_gpio_pm samsung_gpio_pm_1bit = {
.save = samsung_gpio_pm_1bit_save,
.resume = samsung_gpio_pm_1bit_resume,
};
static void samsung_gpio_pm_2bit_save(struct samsung_gpio_chip *chip)
{
chip->pm_save[0] = __raw_readl(chip->base + OFFS_CON);
chip->pm_save[1] = __raw_readl(chip->base + OFFS_DAT);
chip->pm_save[2] = __raw_readl(chip->base + OFFS_UP);
}
/* Test whether the given masked+shifted bits of an GPIO configuration
* are one of the SFN (special function) modes. */
static inline int is_sfn(unsigned long con)
{
return con >= 2;
}
/* Test if the given masked+shifted GPIO configuration is an input */
static inline int is_in(unsigned long con)
{
return con == 0;
}
/* Test if the given masked+shifted GPIO configuration is an output */
static inline int is_out(unsigned long con)
{
return con == 1;
}
/**
* samsung_gpio_pm_2bit_resume() - restore the given GPIO bank
* @chip: The chip information to resume.
*
* Restore one of the GPIO banks that was saved during suspend. This is
* not as simple as once thought, due to the possibility of glitches
* from the order that the CON and DAT registers are set in.
*
* The three states the pin can be are {IN,OUT,SFN} which gives us 9
* combinations of changes to check. Three of these, if the pin stays
* in the same configuration can be discounted. This leaves us with
* the following:
*
* { IN => OUT } Change DAT first
* { IN => SFN } Change CON first
* { OUT => SFN } Change CON first, so new data will not glitch
* { OUT => IN } Change CON first, so new data will not glitch
* { SFN => IN } Change CON first
* { SFN => OUT } Change DAT first, so new data will not glitch [1]
*
* We do not currently deal with the UP registers as these control
* weak resistors, so a small delay in change should not need to bring
* these into the calculations.
*
* [1] this assumes that writing to a pin DAT whilst in SFN will set the
* state for when it is next output.
*/
static void samsung_gpio_pm_2bit_resume(struct samsung_gpio_chip *chip)
{
void __iomem *base = chip->base;
u32 old_gpcon = __raw_readl(base + OFFS_CON);
u32 old_gpdat = __raw_readl(base + OFFS_DAT);
u32 gps_gpcon = chip->pm_save[0];
u32 gps_gpdat = chip->pm_save[1];
u32 gpcon, old, new, mask;
u32 change_mask = 0x0;
int nr;
/* restore GPIO pull-up settings */
__raw_writel(chip->pm_save[2], base + OFFS_UP);
/* Create a change_mask of all the items that need to have
* their CON value changed before their DAT value, so that
* we minimise the work between the two settings.
*/
for (nr = 0, mask = 0x03; nr < 32; nr += 2, mask <<= 2) {
old = (old_gpcon & mask) >> nr;
new = (gps_gpcon & mask) >> nr;
/* If there is no change, then skip */
if (old == new)
continue;
/* If both are special function, then skip */
if (is_sfn(old) && is_sfn(new))
continue;
/* Change is IN => OUT, do not change now */
if (is_in(old) && is_out(new))
continue;
/* Change is SFN => OUT, do not change now */
if (is_sfn(old) && is_out(new))
continue;
/* We should now be at the case of IN=>SFN,
* OUT=>SFN, OUT=>IN, SFN=>IN. */
change_mask |= mask;
}
/* Write the new CON settings */
gpcon = old_gpcon & ~change_mask;
gpcon |= gps_gpcon & change_mask;
__raw_writel(gpcon, base + OFFS_CON);
/* Now change any items that require DAT,CON */
__raw_writel(gps_gpdat, base + OFFS_DAT);
__raw_writel(gps_gpcon, base + OFFS_CON);
S3C_PMDBG("%s: CON %08x => %08x, DAT %08x => %08x\n",
chip->chip.label, old_gpcon, gps_gpcon, old_gpdat, gps_gpdat);
}
struct samsung_gpio_pm samsung_gpio_pm_2bit = {
.save = samsung_gpio_pm_2bit_save,
.resume = samsung_gpio_pm_2bit_resume,
};
#if defined(CONFIG_ARCH_S3C64XX) || defined(CONFIG_PLAT_S5P)
static void samsung_gpio_pm_4bit_save(struct samsung_gpio_chip *chip)
{
chip->pm_save[1] = __raw_readl(chip->base + OFFS_CON);
chip->pm_save[2] = __raw_readl(chip->base + OFFS_DAT);
chip->pm_save[3] = __raw_readl(chip->base + OFFS_UP);
if (chip->chip.ngpio > 8)
chip->pm_save[0] = __raw_readl(chip->base - 4);
}
static u32 samsung_gpio_pm_4bit_mask(u32 old_gpcon, u32 gps_gpcon)
{
u32 old, new, mask;
u32 change_mask = 0x0;
int nr;
for (nr = 0, mask = 0x0f; nr < 16; nr += 4, mask <<= 4) {
old = (old_gpcon & mask) >> nr;
new = (gps_gpcon & mask) >> nr;
/* If there is no change, then skip */
if (old == new)
continue;
/* If both are special function, then skip */
if (is_sfn(old) && is_sfn(new))
continue;
/* Change is IN => OUT, do not change now */
if (is_in(old) && is_out(new))
continue;
/* Change is SFN => OUT, do not change now */
if (is_sfn(old) && is_out(new))
continue;
/* We should now be at the case of IN=>SFN,
* OUT=>SFN, OUT=>IN, SFN=>IN. */
change_mask |= mask;
}
return change_mask;
}
static void samsung_gpio_pm_4bit_con(struct samsung_gpio_chip *chip, int index)
{
void __iomem *con = chip->base + (index * 4);
u32 old_gpcon = __raw_readl(con);
u32 gps_gpcon = chip->pm_save[index + 1];
u32 gpcon, mask;
mask = samsung_gpio_pm_4bit_mask(old_gpcon, gps_gpcon);
gpcon = old_gpcon & ~mask;
gpcon |= gps_gpcon & mask;
__raw_writel(gpcon, con);
}
static void samsung_gpio_pm_4bit_resume(struct samsung_gpio_chip *chip)
{
void __iomem *base = chip->base;
u32 old_gpcon[2];
u32 old_gpdat = __raw_readl(base + OFFS_DAT);
u32 gps_gpdat = chip->pm_save[2];
/* First, modify the CON settings */
old_gpcon[0] = 0;
old_gpcon[1] = __raw_readl(base + OFFS_CON);
samsung_gpio_pm_4bit_con(chip, 0);
if (chip->chip.ngpio > 8) {
old_gpcon[0] = __raw_readl(base - 4);
samsung_gpio_pm_4bit_con(chip, -1);
}
/* Now change the configurations that require DAT,CON */
__raw_writel(chip->pm_save[2], base + OFFS_DAT);
__raw_writel(chip->pm_save[1], base + OFFS_CON);
if (chip->chip.ngpio > 8)
__raw_writel(chip->pm_save[0], base - 4);
__raw_writel(chip->pm_save[2], base + OFFS_DAT);
__raw_writel(chip->pm_save[3], base + OFFS_UP);
if (chip->chip.ngpio > 8) {
S3C_PMDBG("%s: CON4 %08x,%08x => %08x,%08x, DAT %08x => %08x\n",
chip->chip.label, old_gpcon[0], old_gpcon[1],
__raw_readl(base - 4),
__raw_readl(base + OFFS_CON),
old_gpdat, gps_gpdat);
} else
S3C_PMDBG("%s: CON4 %08x => %08x, DAT %08x => %08x\n",
chip->chip.label, old_gpcon[1],
__raw_readl(base + OFFS_CON),
old_gpdat, gps_gpdat);
}
struct samsung_gpio_pm samsung_gpio_pm_4bit = {
.save = samsung_gpio_pm_4bit_save,
.resume = samsung_gpio_pm_4bit_resume,
};
#endif /* CONFIG_ARCH_S3C64XX || CONFIG_PLAT_S5P */
/**
* samsung_pm_save_gpio() - save gpio chip data for suspend
* @ourchip: The chip for suspend.
*/
static void samsung_pm_save_gpio(struct samsung_gpio_chip *ourchip)
{
struct samsung_gpio_pm *pm = ourchip->pm;
if (pm == NULL || pm->save == NULL)
S3C_PMDBG("%s: no pm for %s\n", __func__, ourchip->chip.label);
else
pm->save(ourchip);
}
/**
* samsung_pm_save_gpios() - Save the state of the GPIO banks.
*
* For all the GPIO banks, save the state of each one ready for going
* into a suspend mode.
*/
void samsung_pm_save_gpios(void)
{
struct samsung_gpio_chip *ourchip;
unsigned int gpio_nr;
for (gpio_nr = 0; gpio_nr < S3C_GPIO_END;) {
ourchip = samsung_gpiolib_getchip(gpio_nr);
if (!ourchip) {
gpio_nr++;
continue;
}
samsung_pm_save_gpio(ourchip);
S3C_PMDBG("%s: save %08x,%08x,%08x,%08x\n",
ourchip->chip.label,
ourchip->pm_save[0],
ourchip->pm_save[1],
ourchip->pm_save[2],
ourchip->pm_save[3]);
gpio_nr += ourchip->chip.ngpio;
gpio_nr += CONFIG_S3C_GPIO_SPACE;
}
}
/**
* samsung_pm_resume_gpio() - restore gpio chip data after suspend
* @ourchip: The suspended chip.
*/
static void samsung_pm_resume_gpio(struct samsung_gpio_chip *ourchip)
{
struct samsung_gpio_pm *pm = ourchip->pm;
if (pm == NULL || pm->resume == NULL)
S3C_PMDBG("%s: no pm for %s\n", __func__, ourchip->chip.label);
else
pm->resume(ourchip);
}
void samsung_pm_restore_gpios(void)
{
struct samsung_gpio_chip *ourchip;
unsigned int gpio_nr;
for (gpio_nr = 0; gpio_nr < S3C_GPIO_END;) {
ourchip = samsung_gpiolib_getchip(gpio_nr);
if (!ourchip) {
gpio_nr++;
continue;
}
samsung_pm_resume_gpio(ourchip);
gpio_nr += ourchip->chip.ngpio;
gpio_nr += CONFIG_S3C_GPIO_SPACE;
}
}