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authorMichal Simek <michal.simek@xilinx.com>2013-04-24 10:01:20 +0200
committerMichal Simek <michal.simek@xilinx.com>2013-05-09 11:20:08 +0200
commit4e779ad2e54e39d5343c8c83b4fc686a7bb16859 (patch)
tree00d83f149cdf74c2237b7301dfedcfb241df576d /board/xilinx
parenta8425d52885de047fc00019cdf3e697b4d32b67a (diff)
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gpio: Add support for microblaze xilinx GPIO
Microblaze uses gpio which is connected to the system reset. Currently gpio subsystem wasn't used for it. Add gpio driver and change Microblaze reset logic to be done via gpio subsystem. There are various configurations which Microblaze can have that's why gpio_alloc/gpio_alloc_dual(for dual channel) function has been introduced and gpio can be allocated dynamically. Adding several gpios IP is also possible and supported. For listing gpio configuration please use "gpio status" command This patch also remove one compilation warning: microblaze-generic.c: In function 'do_reset': microblaze-generic.c:38:47: warning: operation on '*1073741824u' may be undefined [-Wsequence-point] Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Diffstat (limited to 'board/xilinx')
-rw-r--r--board/xilinx/microblaze-generic/microblaze-generic.c17
1 files changed, 12 insertions, 5 deletions
diff --git a/board/xilinx/microblaze-generic/microblaze-generic.c b/board/xilinx/microblaze-generic/microblaze-generic.c
index befbb3a..2f5f20e 100644
--- a/board/xilinx/microblaze-generic/microblaze-generic.c
+++ b/board/xilinx/microblaze-generic/microblaze-generic.c
@@ -31,12 +31,17 @@
#include <asm/processor.h>
#include <asm/microblaze_intc.h>
#include <asm/asm.h>
+#include <asm/gpio.h>
+
+#ifdef CONFIG_XILINX_GPIO
+static int reset_pin = -1;
+#endif
int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
-#ifdef CONFIG_SYS_GPIO_0
- *((unsigned long *)(CONFIG_SYS_GPIO_0_ADDR)) =
- ++(*((unsigned long *)(CONFIG_SYS_GPIO_0_ADDR)));
+#ifdef CONFIG_XILINX_GPIO
+ if (reset_pin != -1)
+ gpio_direction_output(reset_pin, 1);
#endif
#ifdef CONFIG_XILINX_TB_WATCHDOG
@@ -52,8 +57,10 @@ int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
int gpio_init (void)
{
-#ifdef CONFIG_SYS_GPIO_0
- *((unsigned long *)(CONFIG_SYS_GPIO_0_ADDR)) = 0xFFFFFFFF;
+#ifdef CONFIG_XILINX_GPIO
+ reset_pin = gpio_alloc(CONFIG_SYS_GPIO_0_ADDR, "reset", 1);
+ if (reset_pin != -1)
+ gpio_request(reset_pin, "reset_pin");
#endif
return 0;
}