GNUBoot
/
coreboot-kgpe-d16
2
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

cpu/allwinner/a10: Refactor and document pinmux API 

Include a function to multiplex more than one pin at a time. This
is useful for peripherals that have the same function number for
all their pins.
Since we now have two functions for muxing pins, also document
them.

Change-Id: I53997cc3a2586e3cf749cd672f69fb427659c67f
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Reviewed-on: http://review.coreboot.org/4565
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Alexandru Gagniuc 2013-12-22 21:30:21 -05:00
parent be32f51aa1
commit 8226dbbf1d
3 changed files with 55 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
src/cpu/allwinner/a10/gpio.h
View File

@ -46,6 +46,7 @@ struct a10_gpio {
u32 sdr_pad_pul;
} __attribute__ ((packed));
void gpio_set_func(u8 port, u8 pin, u8 pad_func);
void gpio_set_pin_func(u8 port, u8 pin, u8 pad_func);
void gpio_set_multipin_func(u8 port, u32 pin_mask, u8 pad_func);
#endif /* __CPU_ALLWINNER_A10_PINMUX_H */

51
src/cpu/allwinner/a10/pinmux.c
View File

@ -11,7 +11,14 @@
static struct a10_gpio *const gpio = (void *)GPIO_BASE;
void gpio_set_func(u8 port, u8 pin, u8 pad_func)
/**
* \brief Set the pad function of a single pin
*
* @param[in] port GPIO port of the pin (GPA -> GPS)
* @param[in] pin the pin number in the given port (1 -> 31)
* @param[in] pad_func The peripheral function to which to connect this pin
*/
void gpio_set_pin_func(u8 port, u8 pin, u8 pad_func)
{
u8 reg, bit;
u32 reg32;
@ -28,3 +35,45 @@ void gpio_set_func(u8 port, u8 pin, u8 pad_func)
reg32 |= (pad_func & 0xf) << bit;
write32(reg32, &gpio->port[port].cfg[reg]);
}
/**
* \brief Set the pad function of a group of pins
*
* Multiplex a group of pins to the same pad function. This is useful for
* peripherals that use the same function number for several pins. This function
* allows those pins to be set with a single call.
*
* Example:
* gpio_set_multipin_func(GPB, (1 << 23) | (1 << 22), 2);
*
* @param[in] port GPIO port of the pin (GPA -> GPS)
* @param[in] pin_mask 32-bit mask indicating which pins to re-multiplex. For
* each set bit, the corresponding pin will be multiplexed.
* @param[in] pad_func The peripheral function to which to connect the pins
*/
void gpio_set_multipin_func(u8 port, u32 pin_mask, u8 pad_func)
{
int j;
u8 reg, bit;
u32 reg32, mask_offset;
if ((port > GPS))
return;
for (reg = 0; reg < 4; reg++) {
mask_offset = 8 * reg;
/* Don't run the inner loop if we're not touching any pins */
if (!(pin_mask & (0xff << mask_offset)))
continue;
reg32 = read32(&gpio->port[port].cfg[reg]);
for (j = 0; j < 8; j++) {
if (!(pin_mask & (1 << (j + mask_offset))))
continue;
bit = j * 4;
reg32 &= ~(0xf << bit);
reg32 |= (pad_func & 0xf) << bit;
}
write32(reg32, &gpio->port[port].cfg[reg]);
}
}

7
src/mainboard/cubietech/cubieboard/bootblock.c
View File

@ -18,8 +18,8 @@
| AHB_DIV_1 \
| AXI_DIV_1
#define GPB22_UART0_TX_FUNC 2
#define GPB23_UART0_RX_FUNC 2
#define GPB_UART0_FUNC 2
#define GPB_UART0_PINS ((1 << 22) | (1 << 23))
static void cubieboard_set_sys_clock(void)
{
@ -57,8 +57,7 @@ static void cubieboard_setup_clocks(void)
static void cubieboard_setup_gpios(void)
{
/* Mux UART pins */
gpio_set_func(GPB, 22, GPB22_UART0_TX_FUNC);
gpio_set_func(GPB, 23, GPB23_UART0_RX_FUNC);
gpio_set_multipin_func(GPB, GPB_UART0_PINS, GPB_UART0_FUNC);
}
static void cubieboard_enable_uart(void)