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allwinner: Introduce GPIO helper function 

Many boards without a dedicated PMIC contain simple regulators, which
can be controlled via GPIO pins.

To later allow turning them off easily, introduce a simple function to
configure a given pin as a GPIO out pin and set it to the desired level.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
This commit is contained in:
Andre Przywara 2018-10-14 12:03:23 +01:00
parent 4ec1a2399c
commit 7020dca0bd
2 changed files with 30 additions and 0 deletions
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1
plat/allwinner/common/include/sunxi_private.h
View File

@ -18,5 +18,6 @@ int sunxi_pmic_setup(uint16_t socid);
void sunxi_security_setup(void);
uint16_t sunxi_read_soc_id(void);
void sunxi_set_gpio_out(char port, int pin, bool level_high);
#endif /* SUNXI_PRIVATE_H */

29
plat/allwinner/common/sunxi_common.c
View File

@ -71,3 +71,32 @@ uint16_t sunxi_read_soc_id(void)
return reg >> 16;
}
/*
* Configure a given pin to the GPIO-OUT function and sets its level.
* The port is given as a capital letter, the pin is the number within
* this port group.
* So to set pin PC7 to high, use: sunxi_set_gpio_out('C', 7, true);
*/
void sunxi_set_gpio_out(char port, int pin, bool level_high)
{
uintptr_t port_base;
if (port < 'A' || port > 'L')
return;
if (port == 'L')
port_base = SUNXI_R_PIO_BASE;
else
port_base = SUNXI_PIO_BASE + (port - 'A') * 0x24;
/* Set the new level first before configuring the pin. */
if (level_high)
mmio_setbits_32(port_base + 0x10, BIT(pin));
else
mmio_clrbits_32(port_base + 0x10, BIT(pin));
/* configure pin as GPIO out (4(3) bits per pin, 1: GPIO out */
mmio_clrsetbits_32(port_base + (pin / 8) * 4,
0x7 << ((pin % 8) * 4),
0x1 << ((pin % 8) * 4));
}