X-Git-Url: https://review.openocd.org/gitweb?p=openocd.git;a=blobdiff_plain;f=src%2Fjtag%2Fdrivers%2Fbcm2835gpio.c;h=926bd89d338fb8e6e7dac6a21147eea769f78e89;hp=1622b22157fc51a9fa0342936e5e5ce123021ca3;hb=84ca4995adfa6d15120e76f99a7b9dd73727d2d8;hpb=d0e763ac7ef6aa17b17bd00ccdfbccfb4eacda69

diff --git a/src/jtag/drivers/bcm2835gpio.c b/src/jtag/drivers/bcm2835gpio.c
index 1622b22157..926bd89d33 100644
--- a/src/jtag/drivers/bcm2835gpio.c
+++ b/src/jtag/drivers/bcm2835gpio.c
@@ -49,9 +49,9 @@ uint32_t bcm2835_peri_base = 0x20000000;
 static int dev_mem_fd;
 static volatile uint32_t *pio_base;
 
-static int bcm2835gpio_read(void);
-static void bcm2835gpio_write(int tck, int tms, int tdi);
-static void bcm2835gpio_reset(int trst, int srst);
+static bb_value_t bcm2835gpio_read(void);
+static int bcm2835gpio_write(int tck, int tms, int tdi);
+static int bcm2835gpio_reset(int trst, int srst);
 
 static int bcm2835_swdio_read(void);
 static void bcm2835_swdio_drive(bool is_output);
@@ -91,12 +91,12 @@ static int speed_coeff = 113714;
 static int speed_offset = 28;
 static unsigned int jtag_delay;
 
-static int bcm2835gpio_read(void)
+static bb_value_t bcm2835gpio_read(void)
 {
-	return !!(GPIO_LEV & 1<<tdo_gpio);
+	return (GPIO_LEV & 1<<tdo_gpio) ? BB_HIGH : BB_LOW;
 }
 
-static void bcm2835gpio_write(int tck, int tms, int tdi)
+static int bcm2835gpio_write(int tck, int tms, int tdi)
 {
 	uint32_t set = tck<<tck_gpio | tms<<tms_gpio | tdi<<tdi_gpio;
 	uint32_t clear = !tck<<tck_gpio | !tms<<tms_gpio | !tdi<<tdi_gpio;
@@ -106,9 +106,11 @@ static void bcm2835gpio_write(int tck, int tms, int tdi)
 
 	for (unsigned int i = 0; i < jtag_delay; i++)
 		asm volatile ("");
+
+	return ERROR_OK;
 }
 
-static void bcm2835gpio_swd_write(int tck, int tms, int tdi)
+static int bcm2835gpio_swd_write(int tck, int tms, int tdi)
 {
 	uint32_t set = tck<<swclk_gpio | tdi<<swdio_gpio;
 	uint32_t clear = !tck<<swclk_gpio | !tdi<<swdio_gpio;
@@ -118,10 +120,12 @@ static void bcm2835gpio_swd_write(int tck, int tms, int tdi)
 
 	for (unsigned int i = 0; i < jtag_delay; i++)
 		asm volatile ("");
+
+	return ERROR_OK;
 }
 
 /* (1) assert or (0) deassert reset lines */
-static void bcm2835gpio_reset(int trst, int srst)
+static int bcm2835gpio_reset(int trst, int srst)
 {
 	uint32_t set = 0;
 	uint32_t clear = 0;
@@ -138,6 +142,8 @@ static void bcm2835gpio_reset(int trst, int srst)
 
 	GPIO_SET = set;
 	GPIO_CLR = clear;
+
+	return ERROR_OK;
 }
 
 static void bcm2835_swdio_drive(bool is_output)
@@ -294,6 +300,9 @@ COMMAND_HANDLER(bcm2835gpio_handle_speed_coeffs)
 		COMMAND_PARSE_NUMBER(int, CMD_ARGV[0], speed_coeff);
 		COMMAND_PARSE_NUMBER(int, CMD_ARGV[1], speed_offset);
 	}
+
+	command_print(CMD_CTX, "BCM2835 GPIO: speed_coeffs = %d, speed_offset = %d",
+				  speed_coeff, speed_offset);
 	return ERROR_OK;
 }
 
@@ -301,6 +310,9 @@ COMMAND_HANDLER(bcm2835gpio_handle_peripheral_base)
 {
 	if (CMD_ARGC == 1)
 		COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], bcm2835_peri_base);
+
+	command_print(CMD_CTX, "BCM2835 GPIO: peripheral_base = 0x%08x",
+				  bcm2835_peri_base);
 	return ERROR_OK;
 }
 
@@ -310,74 +322,84 @@ static const struct command_registration bcm2835gpio_command_handlers[] = {
 		.handler = &bcm2835gpio_handle_jtag_gpionums,
 		.mode = COMMAND_CONFIG,
 		.help = "gpio numbers for tck, tms, tdi, tdo. (in that order)",
-		.usage = "(tck tms tdi tdo)* ",
+		.usage = "[tck tms tdi tdo]",
 	},
 	{
 		.name = "bcm2835gpio_tck_num",
 		.handler = &bcm2835gpio_handle_jtag_gpionum_tck,
 		.mode = COMMAND_CONFIG,
 		.help = "gpio number for tck.",
+		.usage = "[tck]",
 	},
 	{
 		.name = "bcm2835gpio_tms_num",
 		.handler = &bcm2835gpio_handle_jtag_gpionum_tms,
 		.mode = COMMAND_CONFIG,
 		.help = "gpio number for tms.",
+		.usage = "[tms]",
 	},
 	{
 		.name = "bcm2835gpio_tdo_num",
 		.handler = &bcm2835gpio_handle_jtag_gpionum_tdo,
 		.mode = COMMAND_CONFIG,
 		.help = "gpio number for tdo.",
+		.usage = "[tdo]",
 	},
 	{
 		.name = "bcm2835gpio_tdi_num",
 		.handler = &bcm2835gpio_handle_jtag_gpionum_tdi,
 		.mode = COMMAND_CONFIG,
 		.help = "gpio number for tdi.",
+		.usage = "[tdi]",
 	},
 	{
 		.name = "bcm2835gpio_swd_nums",
 		.handler = &bcm2835gpio_handle_swd_gpionums,
 		.mode = COMMAND_CONFIG,
 		.help = "gpio numbers for swclk, swdio. (in that order)",
-		.usage = "(swclk swdio)* ",
+		.usage = "[swclk swdio]",
 	},
 	{
 		.name = "bcm2835gpio_swclk_num",
 		.handler = &bcm2835gpio_handle_swd_gpionum_swclk,
 		.mode = COMMAND_CONFIG,
 		.help = "gpio number for swclk.",
+		.usage = "[swclk]",
 	},
 	{
 		.name = "bcm2835gpio_swdio_num",
 		.handler = &bcm2835gpio_handle_swd_gpionum_swdio,
 		.mode = COMMAND_CONFIG,
 		.help = "gpio number for swdio.",
+		.usage = "[swdio]",
 	},
 	{
 		.name = "bcm2835gpio_srst_num",
 		.handler = &bcm2835gpio_handle_jtag_gpionum_srst,
 		.mode = COMMAND_CONFIG,
 		.help = "gpio number for srst.",
+		.usage = "[srst]",
 	},
 	{
 		.name = "bcm2835gpio_trst_num",
 		.handler = &bcm2835gpio_handle_jtag_gpionum_trst,
 		.mode = COMMAND_CONFIG,
 		.help = "gpio number for trst.",
+		.usage = "[trst]",
 	},
 	{
 		.name = "bcm2835gpio_speed_coeffs",
 		.handler = &bcm2835gpio_handle_speed_coeffs,
 		.mode = COMMAND_CONFIG,
 		.help = "SPEED_COEFF and SPEED_OFFSET for delay calculations.",
+		.usage = "[SPEED_COEFF SPEED_OFFSET]",
 	},
 	{
 		.name = "bcm2835gpio_peripheral_base",
 		.handler = &bcm2835gpio_handle_peripheral_base,
 		.mode = COMMAND_CONFIG,
 		.help = "peripheral base to access GPIOs (RPi1 0x20000000, RPi2 0x3F000000).",
+		.usage = "[base]",
 	},
 
 	COMMAND_REGISTRATION_DONE
@@ -432,10 +454,6 @@ static int bcm2835gpio_init(void)
 			LOG_INFO("JTAG and SWD modes enabled");
 		else
 			LOG_INFO("JTAG only mode enabled (specify swclk and swdio gpio to add SWD mode)");
-		if (!is_gpio_valid(trst_gpio) && !is_gpio_valid(srst_gpio)) {
-			LOG_ERROR("Require at least one of trst or srst gpios to be specified");
-			return ERROR_JTAG_INIT_FAILED;
-		}
 	} else if (bcm2835gpio_swd_mode_possible()) {
 		LOG_INFO("SWD only mode enabled (specify tck, tms, tdi and tdo gpios to add JTAG mode)");
 	} else {
@@ -468,8 +486,8 @@ static int bcm2835gpio_init(void)
 		return ERROR_JTAG_INIT_FAILED;
 	}
 
-	/* set 16mA drive strength */
-	pads_base[BCM2835_PADS_GPIO_0_27_OFFSET] = 0x5a000018 + 7;
+	/* set 4mA drive strength, slew rate limited, hysteresis on */
+	pads_base[BCM2835_PADS_GPIO_0_27_OFFSET] = 0x5a000008 + 1;
 
 	tdo_gpio_mode = MODE_GPIO(tdo_gpio);
 	tdi_gpio_mode = MODE_GPIO(tdi_gpio);