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drivers/bcm2835gpio: Release resources on error and when quitting 

The /dev/mem file descriptor can be closed without invalidating the
mappings so close as soon as possible.

munmap() all memory, either on error or from quit.

Signed-off-by: Steve Marple <stevemarple@googlemail.com>
Change-Id: I2b6a8365f554e332520fa77ccf076188083a932f
Reviewed-on: https://review.openocd.org/c/openocd/+/7122
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
This commit is contained in:
Steve Marple 2022-06-25 17:02:14 +01:00 committed by Antonio Borneo
parent ce217538bc
commit e643a494d4
1 changed files with 20 additions and 2 deletions
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22
src/jtag/drivers/bcm2835gpio.c
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@ -37,7 +37,8 @@ uint32_t bcm2835_peri_base = 0x20000000;
#define GPIO_LEV (*(pio_base+13)) /* current level of the pin */
static int dev_mem_fd;
static volatile uint32_t *pio_base;
static volatile uint32_t *pio_base = MAP_FAILED;
static volatile uint32_t *pads_base = MAP_FAILED;
static bb_value_t bcm2835gpio_read(void);
static int bcm2835gpio_write(int tck, int tms, int tdi);
@ -479,6 +480,19 @@ static bool bcm2835gpio_swd_mode_possible(void)
return 1;
}
static void bcm2835gpio_munmap(void)
{
if (pio_base != MAP_FAILED) {
munmap((void *)pio_base, sysconf(_SC_PAGE_SIZE));
pio_base = MAP_FAILED;
}
if (pads_base != MAP_FAILED) {
munmap((void *)pads_base, sysconf(_SC_PAGE_SIZE));
pads_base = MAP_FAILED;
}
}
static int bcm2835gpio_init(void)
{
bitbang_interface = &bcm2835gpio_bitbang;
@ -514,16 +528,18 @@ 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) {
LOG_ERROR("mmap: %s", strerror(errno));
bcm2835gpio_munmap();
close(dev_mem_fd);
return ERROR_JTAG_INIT_FAILED;
}
close(dev_mem_fd);
/* set 4mA drive strength, slew rate limited, hysteresis on */
pads_base[BCM2835_PADS_GPIO_0_27_OFFSET] = 0x5a000008 + 1;
@ -605,5 +621,7 @@ static int bcm2835gpio_quit(void)
if (is_gpio_valid(swdio_dir_gpio))
SET_MODE_GPIO(swdio_dir_gpio, swdio_dir_gpio_mode);
bcm2835gpio_munmap();
return ERROR_OK;
}