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authorJulius Werner <jwerner@chromium.org>2016-09-01 22:55:58 -0700
committerPatrick Georgi <pgeorgi@google.com>2016-10-04 21:17:37 +0200
commit2768a119ce08893975f3bf6788fd31c7071e7c9a (patch)
tree3b5d3de92e514a0c2beb7efda9e4bc07414e47dc /src
parent1eb69b4a64b0bd96aa57b0e793667dd36d10ff17 (diff)
downloadcoreboot-2768a119ce08893975f3bf6788fd31c7071e7c9a.tar.xz
rockchip: Remove pulls for gpio_output(), clean up code
Output GPIOs should never have a pull-up or pull-down resistor attached since they're actively driven. Since some GPIOs get initialized with a pull at power-on reset, we should explicitly overwrite that setting. Most other platforms do this on gpio_output, but Rockchip hadn't yet. Also, shuffle some code around to make things cleaner and allow for easier code reuse. BRANCH=None BUG=chrome-os-partner:52526 TEST=Booted Kevin. Change-Id: I1425d074ea1e90f4484e1e84a8002b057192c5f7 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: df5b236bfd58b172435043c1cb792b917a4ec4ab Original-Change-Id: I044266d71ef8bd0518316ff72d829d1ca1e30f35 Original-Signed-off-by: Julius Werner <jwerner@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/382531 Original-Reviewed-by: Simon Glass <sjg@google.com> Reviewed-on: https://review.coreboot.org/16710 Tested-by: build bot (Jenkins) Reviewed-by: Martin Roth <martinroth@google.com>
Diffstat (limited to 'src')
-rw-r--r--src/soc/rockchip/common/gpio.c21
-rw-r--r--src/soc/rockchip/common/include/soc/gpio.h15
-rw-r--r--src/soc/rockchip/rk3288/gpio.c2
-rw-r--r--src/soc/rockchip/rk3399/gpio.c8
4 files changed, 30 insertions, 16 deletions
diff --git a/src/soc/rockchip/common/gpio.c b/src/soc/rockchip/common/gpio.c
index 6ea38d4d5f..1ff0bc9012 100644
--- a/src/soc/rockchip/common/gpio.c
+++ b/src/soc/rockchip/common/gpio.c
@@ -21,10 +21,15 @@
#include <soc/soc.h>
#include <stdlib.h>
-static void __gpio_input(gpio_t gpio, u32 pull)
+static void gpio_set_dir(gpio_t gpio, enum gpio_dir dir)
+{
+ clrsetbits_le32(&gpio_port[gpio.port]->swporta_ddr,
+ 1 << gpio.num, dir << gpio.num);
+}
+
+static void gpio_set_pull(gpio_t gpio, enum gpio_pull pull)
{
u32 pull_val = gpio_get_pull_val(gpio, pull);
- clrbits_le32(&gpio_port[gpio.port]->swporta_ddr, 1 << gpio.num);
if (is_pmu_gpio(gpio))
clrsetbits_le32(gpio_grf_reg(gpio), 3 << (gpio.idx * 2),
pull_val << (gpio.idx * 2));
@@ -35,17 +40,20 @@ static void __gpio_input(gpio_t gpio, u32 pull)
void gpio_input(gpio_t gpio)
{
- __gpio_input(gpio, PULLNONE);
+ gpio_set_pull(gpio, GPIO_PULLNONE);
+ gpio_set_dir(gpio, GPIO_INPUT);
}
void gpio_input_pulldown(gpio_t gpio)
{
- __gpio_input(gpio, PULLDOWN);
+ gpio_set_pull(gpio, GPIO_PULLDOWN);
+ gpio_set_dir(gpio, GPIO_INPUT);
}
void gpio_input_pullup(gpio_t gpio)
{
- __gpio_input(gpio, PULLUP);
+ gpio_set_pull(gpio, GPIO_PULLUP);
+ gpio_set_dir(gpio, GPIO_INPUT);
}
int gpio_get(gpio_t gpio)
@@ -55,7 +63,8 @@ int gpio_get(gpio_t gpio)
void gpio_output(gpio_t gpio, int value)
{
- setbits_le32(&gpio_port[gpio.port]->swporta_ddr, 1 << gpio.num);
clrsetbits_le32(&gpio_port[gpio.port]->swporta_dr, 1 << gpio.num,
!!value << gpio.num);
+ gpio_set_dir(gpio, GPIO_OUTPUT);
+ gpio_set_pull(gpio, GPIO_PULLNONE);
}
diff --git a/src/soc/rockchip/common/include/soc/gpio.h b/src/soc/rockchip/common/include/soc/gpio.h
index 2c72435065..a888635f72 100644
--- a/src/soc/rockchip/common/include/soc/gpio.h
+++ b/src/soc/rockchip/common/include/soc/gpio.h
@@ -73,13 +73,18 @@ int is_pmu_gpio(gpio_t gpio);
/* Return the io addr of gpio register */
void *gpio_grf_reg(gpio_t gpio);
-enum {
- PULLNONE = 0,
- PULLUP,
- PULLDOWN
+enum gpio_pull {
+ GPIO_PULLNONE = 0,
+ GPIO_PULLUP = 1,
+ GPIO_PULLDOWN = 2,
+};
+
+enum gpio_dir {
+ GPIO_INPUT = 0,
+ GPIO_OUTPUT = 1,
};
/* The gpio pull bias setting may be different between SoCs */
-u32 gpio_get_pull_val(gpio_t gpio, u32 pull);
+u32 gpio_get_pull_val(gpio_t gpio, enum gpio_pull pull);
#endif
diff --git a/src/soc/rockchip/rk3288/gpio.c b/src/soc/rockchip/rk3288/gpio.c
index c6104087e4..41056f8937 100644
--- a/src/soc/rockchip/rk3288/gpio.c
+++ b/src/soc/rockchip/rk3288/gpio.c
@@ -51,7 +51,7 @@ void *gpio_grf_reg(gpio_t gpio)
return &rk3288_grf->gpio1_p[(gpio.port - 1)][gpio.bank];
}
-u32 gpio_get_pull_val(gpio_t gpio, u32 pull)
+u32 gpio_get_pull_val(gpio_t gpio, enum gpio_pull pull)
{
/* use the default gpio pull bias setting defined in soc/gpio.h */
return pull;
diff --git a/src/soc/rockchip/rk3399/gpio.c b/src/soc/rockchip/rk3399/gpio.c
index a0cf05974c..3316027d4a 100644
--- a/src/soc/rockchip/rk3399/gpio.c
+++ b/src/soc/rockchip/rk3399/gpio.c
@@ -56,7 +56,7 @@ enum {
PULLUP_1V8 = 3,
};
-u32 gpio_get_pull_val(gpio_t gpio, u32 pull)
+u32 gpio_get_pull_val(gpio_t gpio, enum gpio_pull pull)
{
/* The default pull bias setting defined in soc/gpio.h */
u32 pull_val = pull;
@@ -67,13 +67,13 @@ u32 gpio_get_pull_val(gpio_t gpio, u32 pull)
if (IS_GPIO_BANK(gpio, 0, A) || IS_GPIO_BANK(gpio, 0, B) ||
IS_GPIO_BANK(gpio, 2, C) || IS_GPIO_BANK(gpio, 2, D)) {
switch (pull) {
- case PULLUP:
+ case GPIO_PULLUP:
pull_val = PULLUP_1V8;
break;
- case PULLDOWN:
+ case GPIO_PULLDOWN:
pull_val = PULLDOWN_1V8;
break;
- default:
+ case GPIO_PULLNONE:
pull_val = PULLNONE_1V8;
}
}