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tegra2: Use new GPIO APIs in gpio_config_uart() 

... rather than open-coding the register accesses.

However, gpio_request() typically stores the "label" parameter in a global
data structure. This causes problems when called from gpio_config_uart(),
since the code is running before relocation. To solve this, pass a NULL
string to gpio_request(), and modify gpio_request() not to touch the string
if it's NULL.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
This commit is contained in:
Stephen Warren 2011-10-06 12:52:22 +00:00 committed by Albert ARIBAUD
parent d5ef19b9b3
commit 5fac236a97
2 changed files with 6 additions and 18 deletions
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18
board/nvidia/seaboard/seaboard.c
View File

@ -37,23 +37,9 @@
*/
static void gpio_config_uart_seaboard(void)
{
int gp = GPIO_PI3;
struct gpio_ctlr *gpio = (struct gpio_ctlr *)NV_PA_GPIO_BASE;
struct gpio_ctlr_bank *bank = &gpio->gpio_bank[GPIO_BANK(gp)];
u32 val;
/* Enable UART via GPIO_PI3 (port 8, bit 3) so serial console works */
val = readl(&bank->gpio_config[GPIO_PORT(gp)]);
val |= 1 << GPIO_BIT(gp);
writel(val, &bank->gpio_config[GPIO_PORT(gp)]);
val = readl(&bank->gpio_out[GPIO_PORT(gp)]);
val &= ~(1 << GPIO_BIT(gp));
writel(val, &bank->gpio_out[GPIO_PORT(gp)]);
val = readl(&bank->gpio_dir_out[GPIO_PORT(gp)]);
val |= 1 << GPIO_BIT(gp);
writel(val, &bank->gpio_dir_out[GPIO_PORT(gp)]);
gpio_request(GPIO_PI3, NULL);
gpio_direction_output(GPIO_PI3, 0);
}
void gpio_config_uart(void)

6
drivers/gpio/tegra2_gpio.c
View File

@ -146,8 +146,10 @@ int gpio_request(int gp, const char *label)
if (gp >= MAX_NUM_GPIOS)
return -1;
strncpy(gpio_names[gp].name, label, GPIO_NAME_SIZE);
gpio_names[gp].name[GPIO_NAME_SIZE - 1] = '\0';
if (label != NULL) {
strncpy(gpio_names[gp].name, label, GPIO_NAME_SIZE);
gpio_names[gp].name[GPIO_NAME_SIZE - 1] = '\0';
}
/* Configure as a GPIO */
set_config(gp, 1);