/* * TI DaVinci GPIO Support * * Copyright (c) 2006 David Brownell * Copyright (c) 2007, MontaVista Software, Inc. * * 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 #include #include #include #include #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 */