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https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
114 lines
2.6 KiB
C
114 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright 2010 eXMeritus, A Boeing Company
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*/
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#ifndef POWERPC_ASM_MPC85XX_GPIO_H_
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#define POWERPC_ASM_MPC85XX_GPIO_H_
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# include <asm/immap_85xx.h>
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/*
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* The following internal functions are an MPC85XX-specific GPIO API which
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* allows setting and querying multiple GPIOs in a single operation.
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*
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* All of these look relatively large, but the arguments are almost always
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* constants, so they compile down to just a few instructions and a
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* memory-mapped IO operation or two.
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*/
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static inline void mpc85xx_gpio_set(unsigned int mask,
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unsigned int dir, unsigned int val)
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{
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ccsr_gpio_t *gpio = (void *)(CONFIG_SYS_MPC85xx_GPIO_ADDR);
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/* First mask off the unwanted parts of "dir" and "val" */
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dir &= mask;
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val &= mask;
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/* Now read in the values we're supposed to preserve */
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dir |= (in_be32(&gpio->gpdir) & ~mask);
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val |= (in_be32(&gpio->gpdat) & ~mask);
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/*
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* Poke the new output values first, then set the direction. This
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* helps to avoid transient data when switching from input to output
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* and vice versa.
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*/
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out_be32(&gpio->gpdat, val);
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out_be32(&gpio->gpdir, dir);
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}
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static inline void mpc85xx_gpio_set_in(unsigned int gpios)
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{
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mpc85xx_gpio_set(gpios, 0x00000000, 0x00000000);
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}
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static inline void mpc85xx_gpio_set_low(unsigned int gpios)
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{
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mpc85xx_gpio_set(gpios, 0xFFFFFFFF, 0x00000000);
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}
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static inline void mpc85xx_gpio_set_high(unsigned int gpios)
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{
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mpc85xx_gpio_set(gpios, 0xFFFFFFFF, 0xFFFFFFFF);
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}
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static inline unsigned int mpc85xx_gpio_get(unsigned int mask)
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{
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ccsr_gpio_t *gpio = (void *)(CONFIG_SYS_MPC85xx_GPIO_ADDR);
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/* Read the requested values */
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return in_be32(&gpio->gpdat) & mask;
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}
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/*
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* These implement the generic Linux GPIO API on top of the other functions
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* in this header.
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*/
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static inline int gpio_request(unsigned gpio, const char *label)
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{
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/* Compatibility shim */
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return 0;
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}
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static inline int gpio_free(unsigned gpio)
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{
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/* Compatibility shim */
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return 0;
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}
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static inline int gpio_direction_input(unsigned gpio)
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{
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mpc85xx_gpio_set_in(1U << gpio);
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return 0;
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}
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static inline int gpio_direction_output(unsigned gpio, int value)
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{
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if (value)
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mpc85xx_gpio_set_high(1U << gpio);
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else
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mpc85xx_gpio_set_low(1U << gpio);
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return 0;
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}
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static inline int gpio_get_value(unsigned gpio)
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{
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return !!mpc85xx_gpio_get(1U << gpio);
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}
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static inline int gpio_set_value(unsigned gpio, int value)
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{
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if (value)
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mpc85xx_gpio_set_high(1U << gpio);
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else
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mpc85xx_gpio_set_low(1U << gpio);
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return 0;
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}
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static inline int gpio_is_valid(int gpio)
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{
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return (gpio >= 0) && (gpio < 32);
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}
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#endif /* not POWERPC_ASM_MPC85XX_GPIO_H_ */
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