diff options
| -rw-r--r-- | arch/arm/mach-mx3/iomux.c | 88 | ||||
| -rw-r--r-- | arch/arm/plat-mxc/include/mach/iomux-mx3.h | 45 |
2 files changed, 122 insertions, 11 deletions
diff --git a/arch/arm/mach-mx3/iomux.c b/arch/arm/mach-mx3/iomux.c index 7a5088b519a..40ffc5a664d 100644 --- a/arch/arm/mach-mx3/iomux.c +++ b/arch/arm/mach-mx3/iomux.c @@ -1,6 +1,7 @@ /* * Copyright 2004-2006 Freescale Semiconductor, Inc. All Rights Reserved. * Copyright (C) 2008 by Sascha Hauer <kernel@pengutronix.de> + * Copyright (C) 2009 by Valentin Longchamp <valentin.longchamp@epfl.ch> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License @@ -21,6 +22,7 @@ #include <linux/spinlock.h> #include <linux/io.h> #include <linux/gpio.h> +#include <linux/kernel.h> #include <mach/hardware.h> #include <mach/gpio.h> #include <mach/iomux-mx3.h> @@ -38,6 +40,8 @@ static DEFINE_SPINLOCK(gpio_mux_lock); #define IOMUX_REG_MASK (IOMUX_PADNUM_MASK & ~0x3) + +unsigned long mxc_pin_alloc_map[NB_PORTS * 32 / BITS_PER_LONG]; /* * set the mode for a IOMUX pin. */ @@ -50,9 +54,6 @@ int mxc_iomux_mode(unsigned int pin_mode) field = pin_mode & 0x3; mode = (pin_mode & IOMUX_MODE_MASK) >> IOMUX_MODE_SHIFT; - pr_debug("%s: reg offset = 0x%x field = %d mode = 0x%02x\n", - __func__, (pin_mode & IOMUX_REG_MASK), field, mode); - spin_lock(&gpio_mux_lock); l = __raw_readl(reg); @@ -93,6 +94,86 @@ void mxc_iomux_set_pad(enum iomux_pins pin, u32 config) EXPORT_SYMBOL(mxc_iomux_set_pad); /* + * setups a single pin: + * - reserves the pin so that it is not claimed by another driver + * - setups the iomux according to the configuration + * - if the pin is configured as a GPIO, we claim it through kernel gpiolib + */ +int mxc_iomux_setup_pin(const unsigned int pin, const char *label) +{ + unsigned pad = pin & IOMUX_PADNUM_MASK; + unsigned gpio; + + if (pad >= (PIN_MAX + 1)) { + printk(KERN_ERR "mxc_iomux: Attempt to request nonexistant pin %u for \"%s\"\n", + pad, label ? label : "?"); + return -EINVAL; + } + + if (test_and_set_bit(pad, mxc_pin_alloc_map)) { + printk(KERN_ERR "mxc_iomux: pin %u already used. Allocation for \"%s\" failed\n", + pad, label ? label : "?"); + return -EINVAL; + } + mxc_iomux_mode(pin); + + /* if we have a gpio, we can allocate it */ + gpio = (pin & IOMUX_GPIONUM_MASK) >> IOMUX_GPIONUM_SHIFT; + if (gpio < (GPIO_PORT_MAX + 1) * 32) + if (gpio_request(gpio, label)) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL(mxc_iomux_setup_pin); + +int mxc_iomux_setup_multiple_pins(unsigned int *pin_list, unsigned count, + const char *label) +{ + unsigned int *p = pin_list; + int i; + int ret = -EINVAL; + + for (i = 0; i < count; i++) { + if (mxc_iomux_setup_pin(*p, label)) + goto setup_error; + p++; + } + return 0; + +setup_error: + mxc_iomux_release_multiple_pins(pin_list, i); + return ret; +} +EXPORT_SYMBOL(mxc_iomux_setup_multiple_pins); + +void mxc_iomux_release_pin(const unsigned int pin) +{ + unsigned pad = pin & IOMUX_PADNUM_MASK; + unsigned gpio; + + if (pad < (PIN_MAX + 1)) + clear_bit(pad, mxc_pin_alloc_map); + + gpio = (pin & IOMUX_GPIONUM_MASK) >> IOMUX_GPIONUM_SHIFT; + if (gpio < (GPIO_PORT_MAX + 1) * 32) + gpio_free(gpio); +} +EXPORT_SYMBOL(mxc_iomux_release_pin); + +void mxc_iomux_release_multiple_pins(unsigned int *pin_list, int count) +{ + unsigned int *p = pin_list; + int i; + + for (i = 0; i < count; i++) { + mxc_iomux_release_pin(*p); + p++; + } +} +EXPORT_SYMBOL(mxc_iomux_release_multiple_pins); + +/* * This function enables/disables the general purpose function for a particular * signal. */ @@ -111,4 +192,3 @@ void mxc_iomux_set_gpr(enum iomux_gp_func gp, bool en) spin_unlock(&gpio_mux_lock); } EXPORT_SYMBOL(mxc_iomux_set_gpr); - diff --git a/arch/arm/plat-mxc/include/mach/iomux-mx3.h b/arch/arm/plat-mxc/include/mach/iomux-mx3.h index c9198c0aea1..4bdc4712be1 100644 --- a/arch/arm/plat-mxc/include/mach/iomux-mx3.h +++ b/arch/arm/plat-mxc/include/mach/iomux-mx3.h @@ -92,7 +92,7 @@ enum iomux_gp_func { MUX_EXTDMAREQ2_MBX_SEL = 1 << 15, MUX_TAMPER_DETECT_EN = 1 << 16, MUX_PGP_USB_4WIRE = 1 << 17, - MUX_PGB_USB_COMMON = 1 << 18, + MUX_PGP_USB_COMMON = 1 << 18, MUX_SDHC_MEMSTICK1 = 1 << 19, MUX_SDHC_MEMSTICK2 = 1 << 20, MUX_PGP_SPLL_BYP = 1 << 21, @@ -109,21 +109,44 @@ enum iomux_gp_func { }; /* - * This function enables/disables the general purpose function for a particular - * signal. + * setups a single pin: + * - reserves the pin so that it is not claimed by another driver + * - setups the iomux according to the configuration + * - if the pin is configured as a GPIO, we claim it throug kernel gpiolib + */ +int mxc_iomux_setup_pin(const unsigned int pin, const char *label); +/* + * setups mutliple pins + * convenient way to call the above function with tables */ -void iomux_config_gpr(enum iomux_gp_func , bool); +int mxc_iomux_setup_multiple_pins(unsigned int *pin_list, unsigned count, + const char *label); /* - * set the mode for a IOMUX pin. + * releases a single pin: + * - make it available for a future use by another driver + * - frees the GPIO if the pin was configured as GPIO + * - DOES NOT reconfigure the IOMUX in its reset state */ -int mxc_iomux_mode(unsigned int); +void mxc_iomux_release_pin(const unsigned int pin); +/* + * releases multiple pins + * convenvient way to call the above function with tables + */ +void mxc_iomux_release_multiple_pins(unsigned int *pin_list, int count); /* * This function enables/disables the general purpose function for a particular * signal. */ -void mxc_iomux_set_gpr(enum iomux_gp_func, bool); +void mxc_iomux_set_gpr(enum iomux_gp_func, bool en); + +/* + * This function only configures the iomux hardware. + * It is called by the setup functions and should not be called directly anymore. + * It is here visible for backward compatibility + */ +int mxc_iomux_mode(unsigned int pin_mode); #define IOMUX_PADNUM_MASK 0x1ff #define IOMUX_GPIONUM_SHIFT 9 @@ -144,6 +167,11 @@ void mxc_iomux_set_gpr(enum iomux_gp_func, bool); MXC_GPIO_IRQ_START) /* + * The number of gpio devices among the pads + */ +#define GPIO_PORT_MAX 3 + +/* * This enumeration is constructed based on the Section * "sw_pad_ctl & sw_mux_ctl details" of the MX31 IC Spec. Each enumerated * value is constructed based on the rules described above. @@ -480,6 +508,9 @@ enum iomux_pins { MX31_PIN_CAPTURE = IOMUX_PIN( 7, 327), }; +#define PIN_MAX 327 +#define NB_PORTS 12 /* NB_PINS/32, we chose 32 pins per "PORT" */ + /* * Convenience values for use with mxc_iomux_mode() * |