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[ARM] pxa: add MFP-alike pin configuration support for pxa{25x, 27x}
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Pin configuration on pxa{25x,27x} has now separated from generic GPIO
into dedicated mfp-pxa2xx.c by this patch. The name "mfp" is borrowed
from pxa3xx and is used here to alert the difference between the two
concepts: pin configuration and generic GPIOs.  A GPIO can be called
a "GPIO" _only_ when the corresponding pin is configured so.

A pin configuration on pxa{25x,27x} is composed of:

    - alternate function selection (or pin mux as commonly called)
    - low power state or sleep state
    - wakeup enabling from low power mode

The following MFP_xxx bit definitions in mfp.h are re-used:

    - MFP_PIN(x)
    - MFP_AFx
    - MFP_LPM_DRIVE_{LOW, HIGH}
    - MFP_LPM_EDGE_*

Selecting alternate function on pxa{25x, 27x} involves configuration
of GPIO direction register GPDRx, so a new bit and MFP_DIR_{IN, OUT}
are introduced. And pin configurations are defined by the following
two macros:

    - MFP_CFG_IN  : for input alternate functions
    - MFP_CFG_OUT : for output alternate functions

Every configuration should provide a low power state if it configured
as output using MFP_CFG_OUT().  As a general guideline, the low power
state should be decided to minimize the overall power dissipation. As
an example, it is better to drive the pin as high level in low power
mode if the GPIO is configured as an active low chip select.

Pins configured as GPIO are defined by MFP_CFG_IN(). This is to avoid
side effects when it is firstly configured as output.  The actual
direction of the GPIO is configured by gpio_direction_{input, output}

Wakeup enabling on pxa{25x, 27x} is actually GPIO based wakeup, thus
the device based enable_irq_wake() mechanism is not applicable here.

E.g.  invoking enable_irq_wake() with a GPIO IRQ as in the following
code to enable OTG wakeup is by no means portable and intuitive, and
it is valid _only_ when GPIO35 is configured as USB_P2_1:

    enable_irq_wake( gpio_to_irq(35) );

To make things worse, not every GPIO is able to wakeup the system.
Only a small number of them can, on either rising or falling edge,
or when level is high (for keypad GPIOs).

Thus, another new bit is introduced to indicate that the GPIO will
wakeup the system:

    - MFP_LPM_WAKEUP_ENABLE

The following macros can be used in platform code, and be OR'ed to
the GPIO configuration to enable its wakeup:

    - WAKEUP_ON_EDGE_{RISE, FALL, BOTH}
    - WAKEUP_ON_LEVEL_HIGH

The WAKEUP_ON_LEVEL_HIGH is used for keypad GPIOs _only_, there is
no edge settings for those GPIOs.

These WAKEUP_ON_* flags OR'ed on wrong GPIOs will be ignored in case
that platform code author is careless enough.

The tradeoff here is that the wakeup source is fully determined by
the platform configuration, instead of enable_irq_wake().

Signed-off-by: eric miao <eric.miao@marvell.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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eric miao authored and Russell King committed Apr 19, 2008
1 parent a683b14 commit 7facc2f
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Showing 5 changed files with 915 additions and 2 deletions.
4 changes: 2 additions & 2 deletions arch/arm/mach-pxa/Makefile
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# Common support (must be linked before board specific support)
obj-y += clock.o devices.o generic.o irq.o dma.o \
time.o gpio.o
obj-$(CONFIG_PXA25x) += pxa25x.o
obj-$(CONFIG_PXA27x) += pxa27x.o
obj-$(CONFIG_PXA25x) += pxa25x.o mfp-pxa2xx.o
obj-$(CONFIG_PXA27x) += pxa27x.o mfp-pxa2xx.o
obj-$(CONFIG_PXA3xx) += pxa3xx.o mfp-pxa3xx.o smemc.o
obj-$(CONFIG_CPU_PXA300) += pxa300.o
obj-$(CONFIG_CPU_PXA320) += pxa320.o
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190 changes: 190 additions & 0 deletions arch/arm/mach-pxa/mfp-pxa2xx.c
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/*
* linux/arch/arm/mach-pxa/mfp-pxa2xx.c
*
* PXA2xx pin mux configuration support
*
* The GPIOs on PXA2xx can be configured as one of many alternate
* functions, this is by concept samilar to the MFP configuration
* on PXA3xx, what's more important, the low power pin state and
* wakeup detection are also supported by the same framework.
*
* 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/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/sysdev.h>

#include <asm/arch/hardware.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/mfp-pxa2xx.h>

#include "generic.h"

#define PGSR(x) __REG2(0x40F00020, ((x) & 0x60) >> 3)

#define PWER_WE35 (1 << 24)

static struct {
unsigned valid : 1;
unsigned can_wakeup : 1;
unsigned keypad_gpio : 1;
unsigned int mask; /* bit mask in PWER or PKWR */
unsigned long config;
} gpio_desc[MFP_PIN_GPIO127 + 1];

static inline int __mfp_config_gpio(unsigned gpio, unsigned long c)
{
unsigned long gafr, mask = GPIO_bit(gpio);
int fn;

fn = MFP_AF(c);
if (fn > 3)
return -EINVAL;

/* alternate function and direction */
gafr = GAFR(gpio) & ~(0x3 << ((gpio & 0xf) * 2));
GAFR(gpio) = gafr | (fn << ((gpio & 0xf) * 2));

if (c & MFP_DIR_OUT)
GPDR(gpio) |= mask;
else
GPDR(gpio) &= ~mask;

/* low power state */
switch (c & MFP_LPM_STATE_MASK) {
case MFP_LPM_DRIVE_HIGH:
PGSR(gpio) |= mask;
break;
case MFP_LPM_DRIVE_LOW:
PGSR(gpio) &= ~mask;
break;
case MFP_LPM_INPUT:
break;
default:
pr_warning("%s: invalid low power state for GPIO%d\n",
__func__, gpio);
return -EINVAL;
}

/* wakeup enabling */
if ((c & MFP_LPM_WAKEUP_ENABLE) == 0)
return 0;

if (!gpio_desc[gpio].can_wakeup || c & MFP_DIR_OUT) {
pr_warning("%s: GPIO%d unable to wakeup\n",
__func__, gpio);
return -EINVAL;
}

if (gpio_desc[gpio].keypad_gpio)
PKWR |= gpio_desc[gpio].mask;
else {
PWER |= gpio_desc[gpio].mask;

if (c & MFP_LPM_EDGE_RISE)
PRER |= gpio_desc[gpio].mask;

if (c & MFP_LPM_EDGE_FALL)
PFER |= gpio_desc[gpio].mask;
}

return 0;
}

void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
{
unsigned long flags;
unsigned long *c;
int i, gpio;

for (i = 0, c = mfp_cfgs; i < num; i++, c++) {

gpio = mfp_to_gpio(MFP_PIN(*c));

if (!gpio_desc[gpio].valid) {
pr_warning("%s: GPIO%d is invalid pin\n",
__func__, gpio);
continue;
}

local_irq_save(flags);

gpio_desc[gpio].config = *c;
__mfp_config_gpio(gpio, *c);

local_irq_restore(flags);
}
}

#ifdef CONFIG_PXA25x
static int __init pxa25x_mfp_init(void)
{
int i;

if (cpu_is_pxa25x()) {
for (i = 0; i <= 84; i++)
gpio_desc[i].valid = 1;

for (i = 0; i <= 15; i++) {
gpio_desc[i].can_wakeup = 1;
gpio_desc[i].mask = GPIO_bit(i);
}
}

return 0;
}
postcore_initcall(pxa25x_mfp_init);
#endif /* CONFIG_PXA25x */

#ifdef CONFIG_PXA27x
static int pxa27x_pkwr_gpio[] __initdata = {
13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,
95, 96, 97, 98, 99, 100, 101, 102
};

static int __init pxa27x_mfp_init(void)
{
int i, gpio;

if (cpu_is_pxa27x()) {
for (i = 0; i <= 120; i++) {
/* skip GPIO2, 5, 6, 7, 8, they are not
* valid pins allow configuration
*/
if (i == 2 || i == 5 || i == 6 ||
i == 7 || i == 8)
continue;

gpio_desc[i].valid = 1;
}

/* Keypad GPIOs */
for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
gpio = pxa27x_pkwr_gpio[i];
gpio_desc[gpio].can_wakeup = 1;
gpio_desc[gpio].keypad_gpio = 1;
gpio_desc[gpio].mask = 1 << i;
}

/* Overwrite GPIO13 as a PWER wakeup source */
for (i = 0; i <= 15; i++) {
/* skip GPIO2, 5, 6, 7, 8 */
if (GPIO_bit(i) & 0x1e4)
continue;

gpio_desc[i].can_wakeup = 1;
gpio_desc[i].mask = GPIO_bit(i);
}

gpio_desc[35].can_wakeup = 1;
gpio_desc[35].mask = PWER_WE35;
}

return 0;
}
postcore_initcall(pxa27x_mfp_init);
#endif /* CONFIG_PXA27x */
161 changes: 161 additions & 0 deletions include/asm-arm/arch-pxa/mfp-pxa25x.h
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#ifndef __ASM_ARCH_MFP_PXA25X_H
#define __ASM_ARCH_MFP_PXA25X_H

#include <asm/arch/mfp.h>
#include <asm/arch/mfp-pxa2xx.h>

/* GPIO */
#define GPIO2_GPIO MFP_CFG_IN(GPIO2, AF0)
#define GPIO3_GPIO MFP_CFG_IN(GPIO3, AF0)
#define GPIO4_GPIO MFP_CFG_IN(GPIO4, AF0)
#define GPIO5_GPIO MFP_CFG_IN(GPIO5, AF0)
#define GPIO6_GPIO MFP_CFG_IN(GPIO6, AF0)
#define GPIO7_GPIO MFP_CFG_IN(GPIO7, AF0)
#define GPIO8_GPIO MFP_CFG_IN(GPIO8, AF0)

#define GPIO1_RST MFP_CFG_IN(GPIO1, AF1)

/* Crystal and Clock Signals */
#define GPIO10_RTCCLK MFP_CFG_OUT(GPIO10, AF1, DRIVE_LOW)
#define GPIO70_RTC_CLK MFP_CFG_OUT(GPIO70, AF1, DRIVE_LOW)
#define GPIO7_48MHz MFP_CFG_OUT(GPIO7, AF1, DRIVE_LOW)
#define GPIO11_3_6MHz MFP_CFG_OUT(GPIO11, AF1, DRIVE_LOW)
#define GPIO71_3_6MHz MFP_CFG_OUT(GPIO71, AF1, DRIVE_LOW)
#define GPIO12_32KHz MFP_CFG_OUT(GPIO12, AF1, DRIVE_LOW)
#define GPIO72_32kHz MFP_CFG_OUT(GPIO72, AF1, DRIVE_LOW)

/* SDRAM and Static Memory I/O Signals */
#define GPIO15_nCS_1 MFP_CFG_OUT(GPIO15, AF2, DRIVE_HIGH)
#define GPIO78_nCS_2 MFP_CFG_OUT(GPIO78, AF2, DRIVE_HIGH)
#define GPIO79_nCS_3 MFP_CFG_OUT(GPIO79, AF2, DRIVE_HIGH)
#define GPIO80_nCS_4 MFP_CFG_OUT(GPIO80, AF2, DRIVE_HIGH)
#define GPIO33_nCS_5 MFP_CFG_OUT(GPIO33, AF2, DRIVE_HIGH)

/* Miscellaneous I/O and DMA Signals */
#define GPIO18_RDY MFP_CFG_IN(GPIO18, AF1)
#define GPIO20_DREQ_0 MFP_CFG_IN(GPIO20, AF1)
#define GPIO19_DREQ_1 MFP_CFG_IN(GPIO19, AF1)

/* Alternate Bus Master Mode I/O Signals */
#define GPIO13_MBGNT MFP_CFG_OUT(GPIO13, AF2, DRIVE_LOW)
#define GPIO73_MBGNT MFP_CFG_OUT(GPIO73, AF1, DRIVE_LOW)
#define GPIO14_MBREQ MFP_CFG_IN(GPIO14, AF1)
#define GPIO66_MBREQ MFP_CFG_IN(GPIO66, AF1)

/* PC CARD */
#define GPIO52_nPCE_1 MFP_CFG_OUT(GPIO52, AF2, DRIVE_HIGH)
#define GPIO53_nPCE_2 MFP_CFG_OUT(GPIO53, AF2, DRIVE_HIGH)
#define GPIO55_nPREG MFP_CFG_OUT(GPIO55, AF2, DRIVE_HIGH)
#define GPIO50_nPIOR MFP_CFG_OUT(GPIO50, AF2, DRIVE_HIGH)
#define GPIO51_nPIOW MFP_CFG_OUT(GPIO51, AF2, DRIVE_HIGH)
#define GPIO49_nPWE MFP_CFG_OUT(GPIO49, AF2, DRIVE_HIGH)
#define GPIO48_nPOE MFP_CFG_OUT(GPIO48, AF2, DRIVE_HIGH)
#define GPIO57_nIOIS16 MFP_CFG_IN(GPIO57, AF1)
#define GPIO56_nPWAIT MFP_CFG_IN(GPIO56, AF1)
#define GPIO54_nPSKTSEL MFP_CFG_OUT(GPIO54, AF2, DRIVE_HIGH)

/* FFUART */
#define GPIO34_FFUART_RXD MFP_CFG_IN(GPIO34, AF1)
#define GPIO35_FFUART_CTS MFP_CFG_IN(GPIO35, AF1)
#define GPIO36_FFUART_DCD MFP_CFG_IN(GPIO36, AF1)
#define GPIO37_FFUART_DSR MFP_CFG_IN(GPIO37, AF1)
#define GPIO38_FFUART_RI MFP_CFG_IN(GPIO38, AF1)
#define GPIO39_FFUART_TXD MFP_CFG_OUT(GPIO39, AF2, DRIVE_HIGH)
#define GPIO40_FFUART_DTR MFP_CFG_OUT(GPIO40, AF2, DRIVE_HIGH)
#define GPIO41_FFUART_RTS MFP_CFG_OUT(GPIO41, AF2, DRIVE_HIGH)

/* BTUART */
#define GPIO42_BTUART_RXD MFP_CFG_IN(GPIO42, AF1)
#define GPIO43_BTUART_TXD MFP_CFG_OUT(GPIO43, AF2, DRIVE_HIGH)
#define GPIO44_BTUART_CTS MFP_CFG_IN(GPIO44, AF1)
#define GPIO45_BTUART_RTS MFP_CFG_OUT(GPIO45, AF2, DRIVE_HIGH)

/* STUART */
#define GPIO46_STUART_RXD MFP_CFG_IN(GPIO46, AF2)
#define GPIO47_STUART_TXD MFP_CFG_OUT(GPIO47, AF1, DRIVE_HIGH)

/* HWUART */
#define GPIO42_HWUART_RXD MFP_CFG_IN(GPIO42, AF3)
#define GPIO43_HWUART_TXD MFP_CFG_OUT(GPIO43, AF3, DRIVE_HIGH)
#define GPIO44_HWUART_CTS MFP_CFG_IN(GPIO44, AF3)
#define GPIO45_HWUART_RTS MFP_CFG_OUT(GPIO45, AF3, DRIVE_HIGH)
#define GPIO48_HWUART_TXD MFP_CFG_OUT(GPIO48, AF1, DRIVE_HIGH)
#define GPIO49_HWUART_RXD MFP_CFG_IN(GPIO49, AF1)
#define GPIO50_HWUART_CTS MFP_CFG_IN(GPIO50, AF1)
#define GPIO51_HWUART_RTS MFP_CFG_OUT(GPIO51, AF1, DRIVE_HIGH)

/* FICP */
#define GPIO46_FICP_RXD MFP_CFG_IN(GPIO46, AF1)
#define GPIO47_FICP_TXD MFP_CFG_OUT(GPIO47, AF2, DRIVE_HIGH)

/* PWM 0/1 */
#define GPIO16_PWM0_OUT MFP_CFG_OUT(GPIO16, AF2, DRIVE_LOW)
#define GPIO17_PWM1_OUT MFP_CFG_OUT(GPIO17, AF2, DRIVE_LOW)

/* AC97 */
#define GPIO28_AC97_BITCLK MFP_CFG_IN(GPIO28, AF1)
#define GPIO29_AC97_SDATA_IN_0 MFP_CFG_IN(GPIO29, AF1)
#define GPIO30_AC97_SDATA_OUT MFP_CFG_OUT(GPIO30, AF2, DRIVE_LOW)
#define GPIO31_AC97_SYNC MFP_CFG_OUT(GPIO31, AF2, DRIVE_LOW)
#define GPIO32_AC97_SDATA_IN_1 MFP_CFG_IN(GPIO32, AF1)

/* I2S */
#define GPIO28_I2S_BITCLK_IN MFP_CFG_IN(GPIO28, AF2)
#define GPIO28_I2S_BITCLK_OUT MFP_CFG_OUT(GPIO28, AF1, DRIVE_LOW)
#define GPIO29_I2S_SDATA_IN MFP_CFG_IN(GPIO29, AF2)
#define GPIO30_I2S_SDATA_OUT MFP_CFG_OUT(GPIO30, AF1, DRIVE_LOW)
#define GPIO31_I2S_SYNC MFP_CFG_OUT(GPIO31, AF1, DRIVE_LOW)
#define GPIO32_I2S_SYSCLK MFP_CFG_OUT(GPIO32, AF1, DRIVE_LOW)

/* SSP 1 */
#define GPIO23_SSP1_SCLK MFP_CFG_OUT(GPIO23, AF2, DRIVE_LOW)
#define GPIO24_SSP1_SFRM MFP_CFG_OUT(GPIO24, AF2, DRIVE_LOW)
#define GPIO25_SSP1_TXD MFP_CFG_OUT(GPIO25, AF2, DRIVE_LOW)
#define GPIO26_SSP1_RXD MFP_CFG_IN(GPIO26, AF1)
#define GPIO27_SSP1_EXTCLK MFP_CFG_IN(GPIO27, AF1)

/* SSP 2 - NSSP */
#define GPIO81_SSP2_CLK_OUT MFP_CFG_OUT(GPIO81, AF1, DRIVE_LOW)
#define GPIO81_SSP2_CLK_IN MFP_CFG_IN(GPIO81, AF1)
#define GPIO82_SSP2_FRM_OUT MFP_CFG_OUT(GPIO82, AF1, DRIVE_LOW)
#define GPIO82_SSP2_FRM_IN MFP_CFG_IN(GPIO82, AF1)
#define GPIO83_SSP2_TXD MFP_CFG_OUT(GPIO83, AF1, DRIVE_LOW)
#define GPIO83_SSP2_RXD MFP_CFG_IN(GPIO83, AF2)
#define GPIO84_SSP2_TXD MFP_CFG_OUT(GPIO84, AF1, DRIVE_LOW)
#define GPIO84_SSP2_RXD MFP_CFG_IN(GPIO84, AF2)

/* MMC */
#define GPIO6_MMC_CLK MFP_CFG_OUT(GPIO6, AF1, DRIVE_LOW)
#define GPIO8_MMC_CS0 MFP_CFG_OUT(GPIO8, AF1, DRIVE_LOW)
#define GPIO9_MMC_CS1 MFP_CFG_OUT(GPIO9, AF1, DRIVE_LOW)
#define GPIO34_MMC_CS0 MFP_CFG_OUT(GPIO34, AF2, DRIVE_LOW)
#define GPIO39_MMC_CS1 MFP_CFG_OUT(GPIO39, AF1, DRIVE_LOW)
#define GPIO53_MMC_CLK MFP_CFG_OUT(GPIO53, AF1, DRIVE_LOW)
#define GPIO54_MMC_CLK MFP_CFG_OUT(GPIO54, AF1, DRIVE_LOW)
#define GPIO69_MMC_CLK MFP_CFG_OUT(GPIO69, AF1, DRIVE_LOW)
#define GPIO67_MMC_CS0 MFP_CFG_OUT(GPIO67, AF1, DRIVE_LOW)
#define GPIO68_MMC_CS1 MFP_CFG_OUT(GPIO68, AF1, DRIVE_LOW)

/* LCD */
#define GPIO58_LCD_LDD_0 MFP_CFG_OUT(GPIO58, AF2, DRIVE_LOW)
#define GPIO59_LCD_LDD_1 MFP_CFG_OUT(GPIO59, AF2, DRIVE_LOW)
#define GPIO60_LCD_LDD_2 MFP_CFG_OUT(GPIO60, AF2, DRIVE_LOW)
#define GPIO61_LCD_LDD_3 MFP_CFG_OUT(GPIO61, AF2, DRIVE_LOW)
#define GPIO62_LCD_LDD_4 MFP_CFG_OUT(GPIO62, AF2, DRIVE_LOW)
#define GPIO63_LCD_LDD_5 MFP_CFG_OUT(GPIO63, AF2, DRIVE_LOW)
#define GPIO64_LCD_LDD_6 MFP_CFG_OUT(GPIO64, AF2, DRIVE_LOW)
#define GPIO65_LCD_LDD_7 MFP_CFG_OUT(GPIO65, AF2, DRIVE_LOW)
#define GPIO66_LCD_LDD_8 MFP_CFG_OUT(GPIO66, AF2, DRIVE_LOW)
#define GPIO67_LCD_LDD_9 MFP_CFG_OUT(GPIO67, AF2, DRIVE_LOW)
#define GPIO68_LCD_LDD_10 MFP_CFG_OUT(GPIO68, AF2, DRIVE_LOW)
#define GPIO69_LCD_LDD_11 MFP_CFG_OUT(GPIO69, AF2, DRIVE_LOW)
#define GPIO70_LCD_LDD_12 MFP_CFG_OUT(GPIO70, AF2, DRIVE_LOW)
#define GPIO71_LCD_LDD_13 MFP_CFG_OUT(GPIO71, AF2, DRIVE_LOW)
#define GPIO72_LCD_LDD_14 MFP_CFG_OUT(GPIO72, AF2, DRIVE_LOW)
#define GPIO73_LCD_LDD_15 MFP_CFG_OUT(GPIO73, AF2, DRIVE_LOW)
#define GPIO74_LCD_FCLK MFP_CFG_OUT(GPIO74, AF2, DRIVE_LOW)
#define GPIO75_LCD_LCLK MFP_CFG_OUT(GPIO75, AF2, DRIVE_LOW)
#define GPIO76_LCD_PCLK MFP_CFG_OUT(GPIO76, AF2, DRIVE_LOW)
#define GPIO77_LCD_ACBIAS MFP_CFG_OUT(GPIO77, AF2, DRIVE_LOW)

#endif /* __ASM_ARCH_MFP_PXA25X_H */
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