diff options
Diffstat (limited to 'arch/arm/plat-stmp3xxx/include/mach/pinmux.h')
| -rw-r--r-- | arch/arm/plat-stmp3xxx/include/mach/pinmux.h | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/arch/arm/plat-stmp3xxx/include/mach/pinmux.h b/arch/arm/plat-stmp3xxx/include/mach/pinmux.h new file mode 100644 index 00000000000..cc5af82279a --- /dev/null +++ b/arch/arm/plat-stmp3xxx/include/mach/pinmux.h @@ -0,0 +1,157 @@ +/* + * Freescale STMP37XX/STMP378X Pin Multiplexing + * + * Author: Vladislav Buzov <vbuzov@embeddedalley.com> + * + * Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved. + * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved. + */ + +/* + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ +#ifndef __PINMUX_H +#define __PINMUX_H + +#include <linux/spinlock.h> +#include <linux/types.h> +#include <linux/gpio.h> +#include <asm-generic/gpio.h> + +/* Pin definitions */ +#include "pins.h" +#include <mach/pins.h> + +/* + * Each pin may be routed up to four different HW interfaces + * including GPIO + */ +enum pin_fun { + PIN_FUN1 = 0, + PIN_FUN2, + PIN_FUN3, + PIN_GPIO, +}; + +/* + * Each pin may have different output drive strength in range from + * 4mA to 20mA. The most common case is 4, 8 and 12 mA strengths. + */ +enum pin_strength { + PIN_4MA = 0, + PIN_8MA, + PIN_12MA, + PIN_16MA, + PIN_20MA, +}; + +/* + * Each pin can be programmed for 1.8V or 3.3V + */ +enum pin_voltage { + PIN_1_8V = 0, + PIN_3_3V, +}; + +/* + * Structure to define a group of pins and their parameters + */ +struct pin_desc { + unsigned id; + enum pin_fun fun; + enum pin_strength strength; + enum pin_voltage voltage; + unsigned pullup:1; +}; + +struct pin_group { + struct pin_desc *pins; + int nr_pins; +}; + +/* Set pin drive strength */ +void stmp3xxx_pin_strength(unsigned id, enum pin_strength strength, + const char *label); + +/* Set pin voltage */ +void stmp3xxx_pin_voltage(unsigned id, enum pin_voltage voltage, + const char *label); + +/* Enable pull-up resistor for a pin */ +void stmp3xxx_pin_pullup(unsigned id, int enable, const char *label); + +/* + * Request a pin ownership, only one module (identified by @label) + * may own a pin. + */ +int stmp3xxx_request_pin(unsigned id, enum pin_fun fun, const char *label); + +/* Release pin */ +void stmp3xxx_release_pin(unsigned id, const char *label); + +void stmp3xxx_set_pin_type(unsigned id, enum pin_fun fun); + +/* + * Each bank is associated with a number of registers to control + * pin function, drive strength, voltage and pull-up reigster. The + * number of registers of a given type depends on the number of bits + * describin particular pin. + */ +#define HW_MUXSEL_NUM 2 /* registers per bank */ +#define HW_MUXSEL_PIN_LEN 2 /* bits per pin */ +#define HW_MUXSEL_PIN_NUM 16 /* pins per register */ +#define HW_MUXSEL_PINFUN_MASK 0x3 /* pin function mask */ +#define HW_MUXSEL_PINFUN_NUM 4 /* four options for a pin */ + +#define HW_DRIVE_NUM 4 /* registers per bank */ +#define HW_DRIVE_PIN_LEN 4 /* bits per pin */ +#define HW_DRIVE_PIN_NUM 8 /* pins per register */ +#define HW_DRIVE_PINDRV_MASK 0x3 /* pin strength mask - 2 bits */ +#define HW_DRIVE_PINDRV_NUM 5 /* five possible strength values */ +#define HW_DRIVE_PINV_MASK 0x4 /* pin voltage mask - 1 bit */ + + +struct stmp3xxx_pinmux_bank { + struct gpio_chip chip; + + /* Pins allocation map */ + unsigned long pin_map; + + /* Pin owner names */ + const char *pin_labels[32]; + + /* Bank registers */ + void __iomem *hw_muxsel[HW_MUXSEL_NUM]; + void __iomem *hw_drive[HW_DRIVE_NUM]; + void __iomem *hw_pull; + + void __iomem *pin2irq, + *irqlevel, + *irqpolarity, + *irqen, + *irqstat; + + /* HW MUXSEL register function bit values */ + u8 functions[HW_MUXSEL_PINFUN_NUM]; + + /* + * HW DRIVE register strength bit values: + * 0xff - requested strength is not supported for this bank + */ + u8 strengths[HW_DRIVE_PINDRV_NUM]; + + /* GPIO things */ + void __iomem *hw_gpio_in, + *hw_gpio_out, + *hw_gpio_doe; + int irq, virq; +}; + +int __init stmp3xxx_pinmux_init(int virtual_irq_start); + +#endif /* __PINMUX_H */ |