X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=src%2Fjtag%2Fdrivers%2Fsysfsgpio.c;h=78a4c5b77e9928165adef0656be601463570ec48;hb=036de3b48217e9c0b5ec0bbf6638e9cad6cae517;hp=eb4941e6b241a3852dab87f12ade519116eb85ff;hpb=6cb5ba6f1136df2986850f5c176cb38e34ca1795;p=fw%2Fopenocd

diff --git a/src/jtag/drivers/sysfsgpio.c b/src/jtag/drivers/sysfsgpio.c
index eb4941e6b..78a4c5b77 100644
--- a/src/jtag/drivers/sysfsgpio.c
+++ b/src/jtag/drivers/sysfsgpio.c
@@ -29,7 +29,7 @@
  *
  * A gpio is required for tck, tms, tdi and tdo. One or both of srst and trst
  * must be also be specified. The required jtag gpios are specified via the
- * sysfsgpio_jtag_nums command or the relevant sysfsgpio_XXX_num commang.
+ * sysfsgpio_jtag_nums command or the relevant sysfsgpio_XXX_num commands.
  * The srst and trst gpios are set via the sysfsgpio_srst_num and
  * sysfsgpio_trst_num respectively. GPIO numbering follows the kernel
  * convention of starting from 0.
@@ -52,7 +52,9 @@
 #include "config.h"
 #endif
 
+#include <helper/time_support.h>
 #include <jtag/interface.h>
+#include <transport/transport.h>
 #include "bitbang.h"
 
 /*
@@ -60,7 +62,7 @@
  *
  * Assume here that there will be less than 10000 gpios on a system
  */
-static int is_gpio_valid(int gpio)
+static bool is_gpio_valid(int gpio)
 {
 	return gpio >= 0 && gpio < 10000;
 }
@@ -97,8 +99,6 @@ static void unexport_sysfs_gpio(int gpio)
 	snprintf(gpiostr, sizeof(gpiostr), "%d", gpio);
 	if (open_write_close("/sys/class/gpio/unexport", gpiostr) < 0)
 		LOG_ERROR("Couldn't unexport gpio %d", gpio);
-
-	return;
 }
 
 /*
@@ -112,6 +112,7 @@ static void unexport_sysfs_gpio(int gpio)
  */
 static int setup_sysfs_gpio(int gpio, int is_output, int init_high)
 {
+	struct timeval timeout, now;
 	char buf[40];
 	char gpiostr[5];
 	int ret;
@@ -126,25 +127,44 @@ static int setup_sysfs_gpio(int gpio, int is_output, int init_high)
 			LOG_WARNING("gpio %d is already exported", gpio);
 		} else {
 			LOG_ERROR("Couldn't export gpio %d", gpio);
-			perror("sysfsgpio: ");
+			LOG_ERROR("sysfsgpio: %s", strerror(errno));
 			return ERROR_FAIL;
 		}
 	}
 
+	gettimeofday(&timeout, NULL);
+	timeval_add_time(&timeout, 0, 500000);
+
 	snprintf(buf, sizeof(buf), "/sys/class/gpio/gpio%d/direction", gpio);
-	ret = open_write_close(buf, is_output ? (init_high ? "high" : "low") : "in");
+	for (;;) {
+		ret = open_write_close(buf, is_output ? (init_high ? "high" : "low") : "in");
+		if (ret >= 0 || errno != EACCES)
+			break;
+		gettimeofday(&now, NULL);
+		if (timeval_compare(&now, &timeout) >= 0)
+			break;
+		jtag_sleep(10000);
+	}
 	if (ret < 0) {
 		LOG_ERROR("Couldn't set direction for gpio %d", gpio);
-		perror("sysfsgpio: ");
+		LOG_ERROR("sysfsgpio: %s", strerror(errno));
 		unexport_sysfs_gpio(gpio);
 		return ERROR_FAIL;
 	}
 
 	snprintf(buf, sizeof(buf), "/sys/class/gpio/gpio%d/value", gpio);
-	ret = open(buf, O_RDWR | O_NONBLOCK | O_SYNC);
+	for (;;) {
+		ret = open(buf, O_RDWR | O_NONBLOCK | O_SYNC);
+		if (ret >= 0 || errno != EACCES)
+			break;
+		gettimeofday(&now, NULL);
+		if (timeval_compare(&now, &timeout) >= 0)
+			break;
+		jtag_sleep(10000);
+	}
 	if (ret < 0) {
 		LOG_ERROR("Couldn't open value for gpio %d", gpio);
-		perror("sysfsgpio: ");
+		LOG_ERROR("sysfsgpio: %s", strerror(errno));
 		unexport_sysfs_gpio(gpio);
 	}
 
@@ -188,7 +208,7 @@ static void sysfsgpio_swdio_drive(bool is_output)
 	ret = open_write_close(buf, is_output ? "high" : "in");
 	if (ret < 0) {
 		LOG_ERROR("Couldn't set direction for gpio %d", swdio_gpio);
-		perror("sysfsgpio: ");
+		LOG_ERROR("sysfsgpio: %s", strerror(errno));
 	}
 
 	last_stored = false;
@@ -211,7 +231,7 @@ static int sysfsgpio_swdio_read(void)
 	return buf[0] != '0';
 }
 
-static void sysfsgpio_swdio_write(int swclk, int swdio)
+static int sysfsgpio_swd_write(int swclk, int swdio)
 {
 	const char one[] = "1";
 	const char zero[] = "0";
@@ -236,6 +256,8 @@ static void sysfsgpio_swdio_write(int swclk, int swdio)
 	last_swdio = swdio;
 	last_swclk = swclk;
 	last_stored = true;
+
+	return ERROR_OK;
 }
 
 /*
@@ -268,11 +290,6 @@ static bb_value_t sysfsgpio_read(void)
  */
 static int sysfsgpio_write(int tck, int tms, int tdi)
 {
-	if (swd_mode) {
-		sysfsgpio_swdio_write(tck, tdi);
-		return ERROR_OK;
-	}
-
 	const char one[] = "1";
 	const char zero[] = "0";
 
@@ -530,23 +547,30 @@ static int sysfsgpio_quit(void);
 
 static const char * const sysfsgpio_transports[] = { "jtag", "swd", NULL };
 
-struct jtag_interface sysfsgpio_interface = {
-	.name = "sysfsgpio",
+static struct jtag_interface sysfsgpio_interface = {
 	.supported = DEBUG_CAP_TMS_SEQ,
 	.execute_queue = bitbang_execute_queue,
+};
+
+struct adapter_driver sysfsgpio_adapter_driver = {
+	.name = "sysfsgpio",
 	.transports = sysfsgpio_transports,
-	.swd = &bitbang_swd,
 	.commands = sysfsgpio_command_handlers,
+
 	.init = sysfsgpio_init,
 	.quit = sysfsgpio_quit,
+	.reset = sysfsgpio_reset,
+
+	.jtag_ops = &sysfsgpio_interface,
+	.swd_ops = &bitbang_swd,
 };
 
 static struct bitbang_interface sysfsgpio_bitbang = {
 	.read = sysfsgpio_read,
 	.write = sysfsgpio_write,
-	.reset = sysfsgpio_reset,
 	.swdio_read = sysfsgpio_swdio_read,
 	.swdio_drive = sysfsgpio_swdio_drive,
+	.swd_write = sysfsgpio_swd_write,
 	.blink = 0
 };
 
@@ -563,36 +587,40 @@ static void cleanup_fd(int fd, int gpio)
 
 static void cleanup_all_fds(void)
 {
-	cleanup_fd(tck_fd, tck_gpio);
-	cleanup_fd(tms_fd, tms_gpio);
-	cleanup_fd(tdi_fd, tdi_gpio);
-	cleanup_fd(tdo_fd, tdo_gpio);
-	cleanup_fd(trst_fd, trst_gpio);
+	if (transport_is_jtag()) {
+		cleanup_fd(tck_fd, tck_gpio);
+		cleanup_fd(tms_fd, tms_gpio);
+		cleanup_fd(tdi_fd, tdi_gpio);
+		cleanup_fd(tdo_fd, tdo_gpio);
+		cleanup_fd(trst_fd, trst_gpio);
+	}
+	if (transport_is_swd()) {
+		cleanup_fd(swclk_fd, swclk_gpio);
+		cleanup_fd(swdio_fd, swdio_gpio);
+	}
 	cleanup_fd(srst_fd, srst_gpio);
-	cleanup_fd(swclk_fd, swclk_gpio);
-	cleanup_fd(swdio_fd, swdio_gpio);
 }
 
 static bool sysfsgpio_jtag_mode_possible(void)
 {
 	if (!is_gpio_valid(tck_gpio))
-		return 0;
+		return false;
 	if (!is_gpio_valid(tms_gpio))
-		return 0;
+		return false;
 	if (!is_gpio_valid(tdi_gpio))
-		return 0;
+		return false;
 	if (!is_gpio_valid(tdo_gpio))
-		return 0;
-	return 1;
+		return false;
+	return true;
 }
 
 static bool sysfsgpio_swd_mode_possible(void)
 {
 	if (!is_gpio_valid(swclk_gpio))
-		return 0;
+		return false;
 	if (!is_gpio_valid(swdio_gpio))
-		return 0;
-	return 1;
+		return false;
+	return true;
 }
 
 static int sysfsgpio_init(void)
@@ -601,79 +629,62 @@ static int sysfsgpio_init(void)
 
 	LOG_INFO("SysfsGPIO JTAG/SWD bitbang driver");
 
-	if (sysfsgpio_jtag_mode_possible()) {
-		if (sysfsgpio_swd_mode_possible())
-			LOG_INFO("JTAG and SWD modes enabled");
-		else
-			LOG_INFO("JTAG only mode enabled (specify swclk and swdio gpio to add SWD mode)");
-	} else if (sysfsgpio_swd_mode_possible()) {
-		LOG_INFO("SWD only mode enabled (specify tck, tms, tdi and tdo gpios to add JTAG mode)");
-	} else {
-		LOG_ERROR("Require tck, tms, tdi and tdo gpios for JTAG mode and/or swclk and swdio gpio for SWD mode");
-		return ERROR_JTAG_INIT_FAILED;
-	}
-
-
 	/*
 	 * Configure TDO as an input, and TDI, TCK, TMS, TRST, SRST
 	 * as outputs.  Drive TDI and TCK low, and TMS/TRST/SRST high.
 	 * For SWD, SWCLK and SWDIO are configures as output high.
 	 */
-	if (tck_gpio >= 0) {
+
+	if (transport_is_jtag()) {
+		if (!sysfsgpio_jtag_mode_possible()) {
+			LOG_ERROR("Require tck, tms, tdi and tdo gpios for JTAG mode");
+			return ERROR_JTAG_INIT_FAILED;
+		}
+
 		tck_fd = setup_sysfs_gpio(tck_gpio, 1, 0);
 		if (tck_fd < 0)
 			goto out_error;
-	}
 
-	if (tms_gpio >= 0) {
 		tms_fd = setup_sysfs_gpio(tms_gpio, 1, 1);
 		if (tms_fd < 0)
 			goto out_error;
-	}
 
-	if (tdi_gpio >= 0) {
 		tdi_fd = setup_sysfs_gpio(tdi_gpio, 1, 0);
 		if (tdi_fd < 0)
 			goto out_error;
-	}
 
-	if (tdo_gpio >= 0) {
 		tdo_fd = setup_sysfs_gpio(tdo_gpio, 0, 0);
 		if (tdo_fd < 0)
 			goto out_error;
-	}
 
-	/* assume active low*/
-	if (trst_gpio >= 0) {
-		trst_fd = setup_sysfs_gpio(trst_gpio, 1, 1);
-		if (trst_fd < 0)
-			goto out_error;
+		/* assume active low*/
+		if (trst_gpio >= 0) {
+			trst_fd = setup_sysfs_gpio(trst_gpio, 1, 1);
+			if (trst_fd < 0)
+				goto out_error;
+		}
 	}
 
-	/* assume active low*/
-	if (srst_gpio >= 0) {
-		srst_fd = setup_sysfs_gpio(srst_gpio, 1, 1);
-		if (srst_fd < 0)
-			goto out_error;
-	}
+	if (transport_is_swd()) {
+		if (!sysfsgpio_swd_mode_possible()) {
+			LOG_ERROR("Require swclk and swdio gpio for SWD mode");
+			return ERROR_JTAG_INIT_FAILED;
+		}
 
-	if (swclk_gpio >= 0) {
 		swclk_fd = setup_sysfs_gpio(swclk_gpio, 1, 0);
 		if (swclk_fd < 0)
 			goto out_error;
-	}
 
-	if (swdio_gpio >= 0) {
 		swdio_fd = setup_sysfs_gpio(swdio_gpio, 1, 0);
 		if (swdio_fd < 0)
 			goto out_error;
 	}
 
-	if (sysfsgpio_swd_mode_possible()) {
-		if (swd_mode)
-			bitbang_swd_switch_seq(JTAG_TO_SWD);
-		else
-			bitbang_swd_switch_seq(SWD_TO_JTAG);
+	/* assume active low*/
+	if (srst_gpio >= 0) {
+		srst_fd = setup_sysfs_gpio(srst_gpio, 1, 1);
+		if (srst_fd < 0)
+			goto out_error;
 	}
 
 	return ERROR_OK;
@@ -688,4 +699,3 @@ static int sysfsgpio_quit(void)
 	cleanup_all_fds();
 	return ERROR_OK;
 }
-