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63 lines
1.4 KiB
C
63 lines
1.4 KiB
C
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/io.h>
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#include <linux/glamo-gpio.h>
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#include "glamo-core.h"
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#include "glamo-regs.h"
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void glamo_gpio_setpin(struct glamo_core *glamo, unsigned int pin,
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unsigned int value)
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{
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unsigned int reg = REG_OF_GPIO(pin);
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u_int16_t tmp;
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spin_lock(&glamo->lock);
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tmp = readw(glamo->base + reg);
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if (value)
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tmp |= OUTPUT_BIT(pin);
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else
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tmp &= ~OUTPUT_BIT(pin);
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writew(tmp, glamo->base + reg);
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spin_unlock(&glamo->lock);
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}
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EXPORT_SYMBOL(glamo_gpio_setpin);
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int glamo_gpio_getpin(struct glamo_core *glamo, unsigned int pin)
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{
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return readw(REG_OF_GPIO(pin)) & INPUT_BIT(pin) ? 1 : 0;
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}
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EXPORT_SYMBOL(glamo_gpio_getpin);
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void glamo_gpio_cfgpin(struct glamo_core *glamo, unsigned int pinfunc)
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{
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unsigned int reg = REG_OF_GPIO(pinfunc);
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u_int16_t tmp;
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spin_lock(&glamo->lock);
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tmp = readw(glamo->base + reg);
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if ((pinfunc & 0x00f0) == GLAMO_GPIO_F_FUNC) {
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/* pin is a function pin: clear gpio bit */
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tmp &= ~FUNC_BIT(pinfunc);
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} else {
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/* pin is gpio: set gpio bit */
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tmp |= FUNC_BIT(pinfunc);
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if (pinfunc & GLAMO_GPIO_F_IN) {
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/* gpio input: set bit to disable output mode */
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tmp |= GPIO_OUT_BIT(pinfunc);
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} else if (pinfunc & GLAMO_GPIO_F_OUT) {
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/* gpio output: clear bit to enable output mode */
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tmp &= ~GPIO_OUT_BIT(pinfunc);
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}
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}
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writew(tmp, glamo->base + reg);
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spin_unlock(&glamo->lock);
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}
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EXPORT_SYMBOL(glamo_gpio_cfgpin);
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