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author | Arnd Bergmann | 2011-10-31 22:44:18 +0100 |
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committer | Arnd Bergmann | 2011-10-31 22:44:18 +0100 |
commit | 43872fa788060eef91ae437957e0a5e39f1c56fd (patch) | |
tree | dba464da61167d84b4f7470edebd5a769a78f9ee /arch/arm/mach-davinci/include/mach/gpio-davinci.h | |
parent | Merge branch 'pxa/fixes' into next/fixes (diff) | |
parent | ARM: 7104/1: plat-pxa: break out GPIO driver specifics (diff) | |
download | kernel-qcow2-linux-43872fa788060eef91ae437957e0a5e39f1c56fd.tar.gz kernel-qcow2-linux-43872fa788060eef91ae437957e0a5e39f1c56fd.tar.xz kernel-qcow2-linux-43872fa788060eef91ae437957e0a5e39f1c56fd.zip |
Merge branch 'depends/rmk/gpio' into next/fixes
This sorts out merge conflicts with the arm/gpio branch that
already got merged into mainline Linux.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/arm/mach-davinci/include/mach/gpio-davinci.h')
-rw-r--r-- | arch/arm/mach-davinci/include/mach/gpio-davinci.h | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/arch/arm/mach-davinci/include/mach/gpio-davinci.h b/arch/arm/mach-davinci/include/mach/gpio-davinci.h new file mode 100644 index 000000000000..1fdd1fd35448 --- /dev/null +++ b/arch/arm/mach-davinci/include/mach/gpio-davinci.h @@ -0,0 +1,91 @@ +/* + * TI DaVinci GPIO Support + * + * Copyright (c) 2006 David Brownell + * Copyright (c) 2007, MontaVista Software, Inc. <source@mvista.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#ifndef __DAVINCI_DAVINCI_GPIO_H +#define __DAVINCI_DAVINCI_GPIO_H + +#include <linux/io.h> +#include <linux/spinlock.h> + +#include <asm-generic/gpio.h> + +#include <mach/irqs.h> +#include <mach/common.h> + +#define DAVINCI_GPIO_BASE 0x01C67000 + +enum davinci_gpio_type { + GPIO_TYPE_DAVINCI = 0, + GPIO_TYPE_TNETV107X, +}; + +/* + * basic gpio routines + * + * board-specific init should be done by arch/.../.../board-XXX.c (maybe + * initializing banks together) rather than boot loaders; kexec() won't + * go through boot loaders. + * + * the gpio clock will be turned on when gpios are used, and you may also + * need to pay attention to PINMUX registers to be sure those pins are + * used as gpios, not with other peripherals. + * + * On-chip GPIOs are numbered 0..(DAVINCI_N_GPIO-1). For documentation, + * and maybe for later updates, code may write GPIO(N). These may be + * all 1.8V signals, all 3.3V ones, or a mix of the two. A given chip + * may not support all the GPIOs in that range. + * + * GPIOs can also be on external chips, numbered after the ones built-in + * to the DaVinci chip. For now, they won't be usable as IRQ sources. + */ +#define GPIO(X) (X) /* 0 <= X <= (DAVINCI_N_GPIO - 1) */ + +/* Convert GPIO signal to GPIO pin number */ +#define GPIO_TO_PIN(bank, gpio) (16 * (bank) + (gpio)) + +struct davinci_gpio_controller { + struct gpio_chip chip; + int irq_base; + spinlock_t lock; + void __iomem *regs; + void __iomem *set_data; + void __iomem *clr_data; + void __iomem *in_data; +}; + +/* The __gpio_to_controller() and __gpio_mask() functions inline to constants + * with constant parameters; or in outlined code they execute at runtime. + * + * You'd access the controller directly when reading or writing more than + * one gpio value at a time, and to support wired logic where the value + * being driven by the cpu need not match the value read back. + * + * These are NOT part of the cross-platform GPIO interface + */ +static inline struct davinci_gpio_controller * +__gpio_to_controller(unsigned gpio) +{ + struct davinci_gpio_controller *ctlrs = davinci_soc_info.gpio_ctlrs; + int index = gpio / 32; + + if (!ctlrs || index >= davinci_soc_info.gpio_ctlrs_num) + return NULL; + + return ctlrs + index; +} + +static inline u32 __gpio_mask(unsigned gpio) +{ + return 1 << (gpio % 32); +} + +#endif /* __DAVINCI_DAVINCI_GPIO_H */ |