This is an automated email from Gerrit.
Paul Fertser (fercer...@gmail.com) just uploaded a new patch set to Gerrit,
which you can find at http://openocd.zylin.com/1633
-- gerrit
commit 68729ac9dafe2b20aaebf1bf6cfbb134daefd0b4
Author: Paul Fertser <fercer...@gmail.com>
Date: Wed Sep 18 23:42:50 2013 +0400
bcm2835gpio: use maximum drive strength
According to the docs, the default drive strength for the GPIO pads is
8mA but they're capable of 16mA. Configure GPIO 0-27 to use the maximum
(as they might be used on high enough frequency with JTAG).
Change-Id: I621737a1b0a855bb97b56ce2cc46c0e385b74f5d
Signed-off-by: Paul Fertser <fercer...@gmail.com>
diff --git a/src/jtag/drivers/bcm2835gpio.c b/src/jtag/drivers/bcm2835gpio.c
index 5af92c3..1f6e241 100644
--- a/src/jtag/drivers/bcm2835gpio.c
+++ b/src/jtag/drivers/bcm2835gpio.c
@@ -33,6 +33,8 @@
#define BCM2835_PERI_BASE 0x20000000
#define BCM2835_GPIO_BASE (BCM2835_PERI_BASE + 0x200000) /* GPIO
controller */
+#define BCM2835_PADS_GPIO_0_27 0x7e10002c
+
/* GPIO setup macros */
#define MODE_GPIO(g) (*(pio_base+((g)/10))>>(((g)%10)*3) & 7)
#define INP_GPIO(g) do { *(pio_base+((g)/10)) &= ~(7<<(((g)%10)*3)); } while
(0)
@@ -319,6 +321,18 @@ static int bcm2835gpio_init(void)
return ERROR_JTAG_INIT_FAILED;
}
+ static volatile uint32_t *pads_base;
+ pads_base = mmap(NULL, sysconf(_SC_PAGE_SIZE), PROT_READ | PROT_WRITE,
+ MAP_SHARED, dev_mem_fd, BCM2835_PADS_GPIO_0_27);
+
+ if (pads_base == MAP_FAILED) {
+ perror("mmap");
+ close(dev_mem_fd);
+ return ERROR_JTAG_INIT_FAILED;
+ }
+
+ *pads_base = 0x5a000018 + 7; /* 16mA drive strength */
+
tdo_gpio_mode = MODE_GPIO(tdo_gpio);
tdi_gpio_mode = MODE_GPIO(tdi_gpio);
tck_gpio_mode = MODE_GPIO(tck_gpio);
--
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