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[ARM] 2950/1: i.MX gpio setup function
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Patch from Sascha Hauer

Current implementation of imx_gpio_mode does not allow to
configure all alternate routing possibilities of the i.MX. With
this patch every bit in the gpio setup registers has a
corresponding bit in the gpio_mode parameter, so every routing
should be possible now.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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Sascha Hauer authored and Russell King committed Oct 4, 2005
1 parent d78795b commit 0a5b0aa
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Showing 3 changed files with 47 additions and 24 deletions.
23 changes: 12 additions & 11 deletions arch/arm/mach-imx/generic.c
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Original file line number Diff line number Diff line change
Expand Up @@ -28,14 +28,15 @@
#include <linux/module.h>
#include <asm/arch/imxfb.h>
#include <asm/hardware.h>
#include <asm/arch/imx-regs.h>

#include <asm/mach/map.h>

void imx_gpio_mode(int gpio_mode)
{
unsigned int pin = gpio_mode & GPIO_PIN_MASK;
unsigned int port = (gpio_mode & GPIO_PORT_MASK) >> 5;
unsigned int ocr = (gpio_mode & GPIO_OCR_MASK) >> 10;
unsigned int port = (gpio_mode & GPIO_PORT_MASK) >> GPIO_PORT_SHIFT;
unsigned int ocr = (gpio_mode & GPIO_OCR_MASK) >> GPIO_OCR_SHIFT;
unsigned int tmp;

/* Pullup enable */
Expand All @@ -57,7 +58,7 @@ void imx_gpio_mode(int gpio_mode)
GPR(port) &= ~(1<<pin);

/* use as gpio? */
if( ocr == 3 )
if(gpio_mode & GPIO_GIUS)
GIUS(port) |= (1<<pin);
else
GIUS(port) &= ~(1<<pin);
Expand All @@ -72,20 +73,20 @@ void imx_gpio_mode(int gpio_mode)
tmp |= (ocr << (pin*2));
OCR1(port) = tmp;

if( gpio_mode & GPIO_AOUT )
ICONFA1(port) &= ~( 3<<(pin*2));
if( gpio_mode & GPIO_BOUT )
ICONFB1(port) &= ~( 3<<(pin*2));
ICONFA1(port) &= ~( 3<<(pin*2));
ICONFA1(port) |= ((gpio_mode >> GPIO_AOUT_SHIFT) & 3) << (pin * 2);
ICONFB1(port) &= ~( 3<<(pin*2));
ICONFB1(port) |= ((gpio_mode >> GPIO_BOUT_SHIFT) & 3) << (pin * 2);
} else {
tmp = OCR2(port);
tmp &= ~( 3<<((pin-16)*2));
tmp |= (ocr << ((pin-16)*2));
OCR2(port) = tmp;

if( gpio_mode & GPIO_AOUT )
ICONFA2(port) &= ~( 3<<((pin-16)*2));
if( gpio_mode & GPIO_BOUT )
ICONFB2(port) &= ~( 3<<((pin-16)*2));
ICONFA2(port) &= ~( 3<<((pin-16)*2));
ICONFA2(port) |= ((gpio_mode >> GPIO_AOUT_SHIFT) & 3) << ((pin-16) * 2);
ICONFB2(port) &= ~( 3<<((pin-16)*2));
ICONFB2(port) |= ((gpio_mode >> GPIO_BOUT_SHIFT) & 3) << ((pin-16) * 2);
}
}

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2 changes: 1 addition & 1 deletion arch/arm/mach-imx/mx1ads.c
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Original file line number Diff line number Diff line change
Expand Up @@ -55,7 +55,7 @@ static void __init
mx1ads_init(void)
{
#ifdef CONFIG_LEDS
imx_gpio_mode(GPIO_PORTA | GPIO_OUT | GPIO_GPIO | 2);
imx_gpio_mode(GPIO_PORTA | GPIO_OUT | 2);
#endif
platform_add_devices(devices, ARRAY_SIZE(devices));
}
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46 changes: 34 additions & 12 deletions include/asm-arm/arch-imx/imx-regs.h
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Original file line number Diff line number Diff line change
Expand Up @@ -76,6 +76,7 @@
#define GPIO_PIN_MASK 0x1f
#define GPIO_PORT_MASK (0x3 << 5)

#define GPIO_PORT_SHIFT 5
#define GPIO_PORTA (0<<5)
#define GPIO_PORTB (1<<5)
#define GPIO_PORTC (2<<5)
Expand All @@ -88,24 +89,37 @@
#define GPIO_PF (0<<9)
#define GPIO_AF (1<<9)

#define GPIO_OCR_SHIFT 10
#define GPIO_OCR_MASK (3<<10)
#define GPIO_AIN (0<<10)
#define GPIO_BIN (1<<10)
#define GPIO_CIN (2<<10)
#define GPIO_GPIO (3<<10)
#define GPIO_DR (3<<10)

#define GPIO_AOUT (1<<12)
#define GPIO_BOUT (1<<13)
#define GPIO_AOUT_SHIFT 12
#define GPIO_AOUT_MASK (3<<12)
#define GPIO_AOUT (0<<12)
#define GPIO_AOUT_ISR (1<<12)
#define GPIO_AOUT_0 (2<<12)
#define GPIO_AOUT_1 (3<<12)

#define GPIO_BOUT_SHIFT 14
#define GPIO_BOUT_MASK (3<<14)
#define GPIO_BOUT (0<<14)
#define GPIO_BOUT_ISR (1<<14)
#define GPIO_BOUT_0 (2<<14)
#define GPIO_BOUT_1 (3<<14)

#define GPIO_GIUS (1<<16)

/* assignements for GPIO alternate/primary functions */

/* FIXME: This list is not completed. The correct directions are
* missing on some (many) pins
*/
#define PA0_PF_A24 ( GPIO_PORTA | GPIO_PF | 0 )
#define PA0_AIN_SPI2_CLK ( GPIO_PORTA | GPIO_OUT | GPIO_AIN | 0 )
#define PA0_AIN_SPI2_CLK ( GPIO_GIUS | GPIO_PORTA | GPIO_OUT | 0 )
#define PA0_AF_ETMTRACESYNC ( GPIO_PORTA | GPIO_AF | 0 )
#define PA1_AOUT_SPI2_RXD ( GPIO_PORTA | GPIO_IN | GPIO_AOUT | 1 )
#define PA1_AOUT_SPI2_RXD ( GPIO_GIUS | GPIO_PORTA | GPIO_IN | 1 )
#define PA1_PF_TIN ( GPIO_PORTA | GPIO_PF | 1 )
#define PA2_PF_PWM0 ( GPIO_PORTA | GPIO_OUT | GPIO_PF | 2 )
#define PA3_PF_CSI_MCLK ( GPIO_PORTA | GPIO_PF | 3 )
Expand All @@ -123,7 +137,7 @@
#define PA15_PF_I2C_SDA ( GPIO_PORTA | GPIO_OUT | GPIO_PF | 15 )
#define PA16_PF_I2C_SCL ( GPIO_PORTA | GPIO_OUT | GPIO_PF | 16 )
#define PA17_AF_ETMTRACEPKT4 ( GPIO_PORTA | GPIO_AF | 17 )
#define PA17_AIN_SPI2_SS ( GPIO_PORTA | GPIO_AIN | 17 )
#define PA17_AIN_SPI2_SS ( GPIO_GIUS | GPIO_PORTA | GPIO_OUT | 17 )
#define PA18_AF_ETMTRACEPKT5 ( GPIO_PORTA | GPIO_AF | 18 )
#define PA19_AF_ETMTRACEPKT6 ( GPIO_PORTA | GPIO_AF | 19 )
#define PA20_AF_ETMTRACEPKT7 ( GPIO_PORTA | GPIO_AF | 20 )
Expand Down Expand Up @@ -191,19 +205,27 @@
#define PC15_PF_SPI1_SS ( GPIO_PORTC | GPIO_PF | 15 )
#define PC16_PF_SPI1_MISO ( GPIO_PORTC | GPIO_PF | 16 )
#define PC17_PF_SPI1_MOSI ( GPIO_PORTC | GPIO_PF | 17 )
#define PC24_BIN_UART3_RI ( GPIO_GIUS | GPIO_PORTC | GPIO_OUT | GPIO_BIN | 24 )
#define PC25_BIN_UART3_DSR ( GPIO_GIUS | GPIO_PORTC | GPIO_OUT | GPIO_BIN | 25 )
#define PC26_AOUT_UART3_DTR ( GPIO_GIUS | GPIO_PORTC | GPIO_IN | 26 )
#define PC27_BIN_UART3_DCD ( GPIO_GIUS | GPIO_PORTC | GPIO_OUT | GPIO_BIN | 27 )
#define PC28_BIN_UART3_CTS ( GPIO_GIUS | GPIO_PORTC | GPIO_OUT | GPIO_BIN | 28 )
#define PC29_AOUT_UART3_RTS ( GPIO_GIUS | GPIO_PORTC | GPIO_IN | 29 )
#define PC30_BIN_UART3_TX ( GPIO_GIUS | GPIO_PORTC | GPIO_BIN | 30 )
#define PC31_AOUT_UART3_RX ( GPIO_GIUS | GPIO_PORTC | GPIO_IN | 31)
#define PD6_PF_LSCLK ( GPIO_PORTD | GPIO_OUT | GPIO_PF | 6 )
#define PD7_PF_REV ( GPIO_PORTD | GPIO_PF | 7 )
#define PD7_AF_UART2_DTR ( GPIO_PORTD | GPIO_IN | GPIO_AF | 7 )
#define PD7_AIN_SPI2_SCLK ( GPIO_PORTD | GPIO_AIN | 7 )
#define PD7_AIN_SPI2_SCLK ( GPIO_GIUS | GPIO_PORTD | GPIO_AIN | 7 )
#define PD8_PF_CLS ( GPIO_PORTD | GPIO_PF | 8 )
#define PD8_AF_UART2_DCD ( GPIO_PORTD | GPIO_OUT | GPIO_AF | 8 )
#define PD8_AIN_SPI2_SS ( GPIO_PORTD | GPIO_AIN | 8 )
#define PD8_AIN_SPI2_SS ( GPIO_GIUS | GPIO_PORTD | GPIO_AIN | 8 )
#define PD9_PF_PS ( GPIO_PORTD | GPIO_PF | 9 )
#define PD9_AF_UART2_RI ( GPIO_PORTD | GPIO_OUT | GPIO_AF | 9 )
#define PD9_AOUT_SPI2_RXD ( GPIO_PORTD | GPIO_IN | GPIO_AOUT | 9 )
#define PD9_AOUT_SPI2_RXD ( GPIO_GIUS | GPIO_PORTD | GPIO_IN | 9 )
#define PD10_PF_SPL_SPR ( GPIO_PORTD | GPIO_OUT | GPIO_PF | 10 )
#define PD10_AF_UART2_DSR ( GPIO_PORTD | GPIO_OUT | GPIO_AF | 10 )
#define PD10_AIN_SPI2_TXD ( GPIO_PORTD | GPIO_OUT | GPIO_AIN | 10 )
#define PD10_AIN_SPI2_TXD ( GPIO_GIUS | GPIO_PORTD | GPIO_OUT | 10 )
#define PD11_PF_CONTRAST ( GPIO_PORTD | GPIO_OUT | GPIO_PF | 11 )
#define PD12_PF_ACD_OE ( GPIO_PORTD | GPIO_OUT | GPIO_PF | 12 )
#define PD13_PF_LP_HSYNC ( GPIO_PORTD | GPIO_OUT | GPIO_PF | 13 )
Expand All @@ -225,7 +247,7 @@
#define PD29_PF_LD14 ( GPIO_PORTD | GPIO_OUT | GPIO_PF | 29 )
#define PD30_PF_LD15 ( GPIO_PORTD | GPIO_OUT | GPIO_PF | 30 )
#define PD31_PF_TMR2OUT ( GPIO_PORTD | GPIO_PF | 31 )
#define PD31_BIN_SPI2_TXD ( GPIO_PORTD | GPIO_BIN | 31 )
#define PD31_BIN_SPI2_TXD ( GPIO_GIUS | GPIO_PORTD | GPIO_BIN | 31 )

/*
* PWM controller
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