omap mux系统

1.2.6.29内核使用的mux系统：

(1)定义arch/arm/mach-omap2/mux.c：

MUX_CFG_34XX("GP142_UART2_TX", 0x170,

              OMAP34XX_MUX_MODE1 | OMAP34XX_PIN_OUTPUT) /* GP142 UART2_TX */

MUX_CFG_34XX("GP143_UART2_RX", 0x172,

               OMAP34XX_MUX_MODE1 | OMAP34XX_PIN_INPUT) /* GP143 UART2_RX */

(2)添加arch/arm/plat-omap/include/mach/mux.h：

        GP142_UART2_TX,

        GP14333_UART2_RX,

(3)在主文件设置arch/arm/mach-omap2/board-omap3evm.c：

        omap_cfg_reg(GP142_UART2_TX);

        omap_cfg_reg(GP143_UART2_RX);

======================================================================

2.2.6.32内核使用的新的mux系统

(1)定义arch/arm/mach-omap2/mux34xx.c

#ifdef CONFIG_OMAP_MUX

#define _OMAP3_MUXENTRY(M0, g, m0, m1, m2, m3, m4, m5, m6, m7) \

{ \

.reg_offset = (OMAP3_CONTROL_PADCONF_##M0##_OFFSET), \

.gpio = (g), \

.muxnames = { m0, m1, m2, m3, m4, m5, m6, m7 }, \

}

#else

#define _OMAP3_MUXENTRY(M0, g, m0, m1, m2, m3, m4, m5, m6, m7) \

{ \

.reg_offset = (OMAP3_CONTROL_PADCONF_##M0##_OFFSET), \

.gpio = (g), \

}

#endif

关注红色部分，M0指的是主名称，g代表gpio,m0-m7是他们的别名

如：

_OMAP3_MUXENTRY(SDMMC2_DAT6, 138,

"sdmmc2_dat6", "sdmmc2_dir_cmd", "cam_shutter", "sdmmc3_dat2",

"gpio_138", "hsusb3_tll_dir", NULL, "safe_mode"),

(2)使用主名初始化

OMAP3_MUX(SDMMC2_DAT6, OMAP_MUX_MODE1 | OMAP_PIN_OUTPUT),

(3)使用别名初始化

omap_mux_init_signal("sdmmc2_dat6.sdmmc2_dat6",

OMAP_PIN_INPUT_PULLUP);

omap_mux_init_signal("hsusb3_tll_dir",

OMAP_PIN_INPUT_PULLDOWN);

======================================================================

3.在omap系统初始化gpio的流程为：

(1)定义，如果复杂的初始化就需要用上面的方法去初始化。

omap_mux_init_gpio(OMAP3STALKER_ETHR_GPIO_IRQ, OMAP_PIN_INPUT_PULLUP);

(2)申请

gpio_request(OMAP3STALKER_ETHR_GPIO_IRQ, "SMC911x irq") < 0)

(3)方向

gpio_direction_input(OMAP3STALKER_ETHR_GPIO_IRQ);

(4)gpio转irq

OMAP_GPIO_IRQ(OMAP3STALKER_ETHR_GPIO_IRQ)