bcm2835gpio.c File Reference

Include dependency graph for bcm2835gpio.c:

Go to the source code of this file.

Data Structures
struct	initial_gpio_state

Macros
#define	BCM2835_GPIO_BASE   (bcm2835_peri_base + 0x200000) /* GPIO controller */
#define	BCM2835_GPIO_MODE_INPUT   0
#define	BCM2835_GPIO_MODE_OUTPUT   1
#define	BCM2835_PADS_GPIO_0_27   (bcm2835_peri_base + 0x100000)
#define	BCM2835_PADS_GPIO_0_27_OFFSET   (0x2c / 4)
#define	GPIO_CLR   (*(pio_base + 10)) /* clears bits which are 1, ignores bits which are 0 */
#define	GPIO_LEV   (*(pio_base + 13)) /* current level of the pin */
#define	GPIO_SET   (*(pio_base + 7)) /* sets bits which are 1, ignores bits which are 0 */
#define	INP_GPIO(_g)
#define	MODE_GPIO(_g)
#define	OUT_GPIO(g)   SET_MODE_GPIO(g, BCM2835_GPIO_MODE_OUTPUT)
#define	SET_MODE_GPIO(_g, m)

Functions
static void	bcm2835_delay (void)
static const char *	bcm2835_get_mem_dev (void)
static void	bcm2835_gpio_synchronize (void)
static void	bcm2835_swdio_drive (bool is_output)
static int	bcm2835_swdio_read (void)
static int	bcm2835gpio_blink (bool on)
static int	bcm2835gpio_init (void)
static bool	bcm2835gpio_jtag_mode_possible (void)
static int	bcm2835gpio_khz (int khz, int *jtag_speed)
static void	bcm2835gpio_munmap (void)
static int	bcm2835gpio_quit (void)
static bb_value_t	bcm2835gpio_read (void)
static int	bcm2835gpio_reset (int trst, int srst)
static int	bcm2835gpio_speed (int speed)
static int	bcm2835gpio_speed_div (int speed, int *khz)
static bool	bcm2835gpio_swd_mode_possible (void)
static int	bcm2835gpio_swd_write_fast (int swclk, int swdio)
static int	bcm2835gpio_swd_write_generic (int swclk, int swdio)
static int	bcm2835gpio_write (int tck, int tms, int tdi)
	COMMAND_HANDLER (bcm2835gpio_handle_peripheral_base)
	COMMAND_HANDLER (bcm2835gpio_handle_peripheral_mem_dev)
	COMMAND_HANDLER (bcm2835gpio_handle_speed_coeffs)
static void	initialize_gpio (enum adapter_gpio_config_index idx)
static bool	is_gpio_config_valid (enum adapter_gpio_config_index idx)
static void	restore_gpio (enum adapter_gpio_config_index idx)
static void	set_gpio_value (const struct adapter_gpio_config *gpio_config, int value)

Variables
static const struct adapter_gpio_config *	adapter_gpio_config
static off_t	bcm2835_peri_base = 0x20000000
static char *	bcm2835_peri_mem_dev
static const char *const	bcm2835_transports [] = { "jtag", "swd", NULL }
struct adapter_driver	bcm2835gpio_adapter_driver
static struct bitbang_interface	bcm2835gpio_bitbang
static const struct command_registration	bcm2835gpio_command_handlers []
static struct jtag_interface	bcm2835gpio_interface
static const struct command_registration	bcm2835gpio_subcommand_handlers []
static int	dev_mem_fd
static uint32_t	initial_drive_strength_etc
static struct initial_gpio_state	initial_gpio_state [ADAPTER_GPIO_IDX_NUM]
static unsigned int	jtag_delay
static volatile uint32_t *	pads_base = MAP_FAILED
static volatile uint32_t *	pio_base = MAP_FAILED
static int	speed_coeff = 113714
static int	speed_offset = 28

Macro Definition Documentation

BCM2835_GPIO_BASE

#define BCM2835_GPIO_BASE   (bcm2835_peri_base + 0x200000) /* GPIO controller */

Definition at line 24 of file bcm2835gpio.c.

BCM2835_GPIO_MODE_INPUT

#define BCM2835_GPIO_MODE_INPUT   0

Definition at line 30 of file bcm2835gpio.c.

BCM2835_GPIO_MODE_OUTPUT

#define BCM2835_GPIO_MODE_OUTPUT   1

Definition at line 31 of file bcm2835gpio.c.

BCM2835_PADS_GPIO_0_27

#define BCM2835_PADS_GPIO_0_27   (bcm2835_peri_base + 0x100000)

Definition at line 26 of file bcm2835gpio.c.

BCM2835_PADS_GPIO_0_27_OFFSET

#define BCM2835_PADS_GPIO_0_27_OFFSET   (0x2c / 4)

Definition at line 27 of file bcm2835gpio.c.

GPIO_CLR

#define GPIO_CLR   (*(pio_base + 10)) /* clears bits which are 1, ignores bits which are 0 */

Definition at line 54 of file bcm2835gpio.c.

GPIO_LEV

#define GPIO_LEV   (*(pio_base + 13)) /* current level of the pin */

Definition at line 55 of file bcm2835gpio.c.

GPIO_SET

#define GPIO_SET   (*(pio_base + 7)) /* sets bits which are 1, ignores bits which are 0 */

Definition at line 53 of file bcm2835gpio.c.

INP_GPIO

#define INP_GPIO

(

_g

)

Value:

    do {                                  \
    typeof(_g) g1 = (_g);                                  \
    *(pio_base + (g1 / 10)) &= ~(7 << ((g1 % 10) * 3));    \
} while (0)

Definition at line 39 of file bcm2835gpio.c.

MODE_GPIO

#define MODE_GPIO

(

_g

)

Value:

    ({                                   \
    typeof(_g) g = (_g);                                   \
    *(pio_base + (g / 10)) >> ((g % 10) * 3) & 7;          \
})

Definition at line 34 of file bcm2835gpio.c.

OUT_GPIO

#define OUT_GPIO

(

g

)

SET_MODE_GPIO(g, BCM2835_GPIO_MODE_OUTPUT)

Definition at line 51 of file bcm2835gpio.c.

SET_MODE_GPIO

#define SET_MODE_GPIO	(		_g,
			m
	)

Value:

    do {                          \
    typeof(_g) g = (_g);                                   \
    /* clear the mode bits first, then set as necessary */ \
    INP_GPIO(g);                                           \
    *(pio_base + (g / 10)) |= ((m) << ((g % 10) * 3));     \
} while (0)

Definition at line 44 of file bcm2835gpio.c.

Function Documentation

bcm2835_delay()

static void bcm2835_delay ( void  )

inlinestatic

Definition at line 90 of file bcm2835gpio.c.

References jtag_delay.

Referenced by bcm2835gpio_swd_write_fast(), bcm2835gpio_swd_write_generic(), and bcm2835gpio_write().

bcm2835_get_mem_dev()

static const char* bcm2835_get_mem_dev ( void  )

inlinestatic

Definition at line 73 of file bcm2835gpio.c.

References bcm2835_peri_mem_dev.

Referenced by bcm2835gpio_init(), and COMMAND_HANDLER().

bcm2835_gpio_synchronize()

static void bcm2835_gpio_synchronize ( void  )

inlinestatic

Definition at line 81 of file bcm2835gpio.c.

Referenced by bcm2835_swdio_drive(), bcm2835gpio_swd_write_fast(), bcm2835gpio_write(), initialize_gpio(), restore_gpio(), and set_gpio_value().

bcm2835_swdio_drive()

static void bcm2835_swdio_drive ( bool  is_output )

static

Definition at line 264 of file bcm2835gpio.c.

References ADAPTER_GPIO_IDX_SWDIO, ADAPTER_GPIO_IDX_SWDIO_DIR, bcm2835_gpio_synchronize(), INP_GPIO, is_gpio_config_valid(), OUT_GPIO, and set_gpio_value().

bcm2835_swdio_read()

static int bcm2835_swdio_read ( void  )

static

Definition at line 278 of file bcm2835gpio.c.

References adapter_gpio_config::active_low, ADAPTER_GPIO_IDX_SWDIO, GPIO_LEV, and adapter_gpio_config::gpio_num.

bcm2835gpio_blink()

static int bcm2835gpio_blink ( bool  on )

static

Definition at line 422 of file bcm2835gpio.c.

bcm2835gpio_init()

static int bcm2835gpio_init ( void  )

static

Definition at line 439 of file bcm2835gpio.c.

References ADAPTER_GPIO_DRIVE_MODE_PUSH_PULL, adapter_gpio_get_config(), ADAPTER_GPIO_IDX_LED, ADAPTER_GPIO_IDX_SRST, ADAPTER_GPIO_IDX_SWCLK, ADAPTER_GPIO_IDX_SWDIO, ADAPTER_GPIO_IDX_SWDIO_DIR, ADAPTER_GPIO_IDX_TCK, ADAPTER_GPIO_IDX_TDI, ADAPTER_GPIO_IDX_TDO, ADAPTER_GPIO_IDX_TMS, ADAPTER_GPIO_IDX_TRST, ADAPTER_GPIO_INIT_STATE_INPUT, bcm2835_get_mem_dev(), BCM2835_GPIO_BASE, BCM2835_PADS_GPIO_0_27, BCM2835_PADS_GPIO_0_27_OFFSET, bcm2835gpio_bitbang, bcm2835gpio_jtag_mode_possible(), bcm2835gpio_swd_mode_possible(), bcm2835gpio_swd_write_fast(), bcm2835gpio_swd_write_generic(), dev_mem_fd, ERROR_JTAG_INIT_FAILED, ERROR_OK, initial_drive_strength_etc, initialize_gpio(), LOG_DEBUG, LOG_ERROR, LOG_INFO, LOG_WARNING, NULL, pads_base, pio_base, bitbang_interface::swd_write, transport_is_jtag(), and transport_is_swd().

bcm2835gpio_jtag_mode_possible()

static bool bcm2835gpio_jtag_mode_possible ( void  )

static

Definition at line 387 of file bcm2835gpio.c.

References ADAPTER_GPIO_IDX_TCK, ADAPTER_GPIO_IDX_TDI, ADAPTER_GPIO_IDX_TDO, ADAPTER_GPIO_IDX_TMS, and is_gpio_config_valid().

Referenced by bcm2835gpio_init().

bcm2835gpio_khz()

static int bcm2835gpio_khz ( int  khz, int *  jtag_speed  )

static

Definition at line 285 of file bcm2835gpio.c.

References DIV_ROUND_UP, ERROR_FAIL, ERROR_OK, LOG_DEBUG, speed_coeff, and speed_offset.

bcm2835gpio_munmap()

static void bcm2835gpio_munmap ( void  )

static

Definition at line 409 of file bcm2835gpio.c.

References pads_base, and pio_base.

Referenced by bcm2835gpio_quit().

bcm2835gpio_quit()

static int bcm2835gpio_quit ( void  )

static

Definition at line 545 of file bcm2835gpio.c.

References ADAPTER_GPIO_IDX_LED, ADAPTER_GPIO_IDX_SRST, ADAPTER_GPIO_IDX_SWCLK, ADAPTER_GPIO_IDX_SWDIO, ADAPTER_GPIO_IDX_SWDIO_DIR, ADAPTER_GPIO_IDX_TCK, ADAPTER_GPIO_IDX_TDI, ADAPTER_GPIO_IDX_TDO, ADAPTER_GPIO_IDX_TMS, ADAPTER_GPIO_IDX_TRST, BCM2835_PADS_GPIO_0_27_OFFSET, bcm2835_peri_mem_dev, bcm2835gpio_munmap(), ERROR_OK, initial_drive_strength_etc, INP_GPIO, pads_base, restore_gpio(), transport_is_jtag(), and transport_is_swd().

bcm2835gpio_read()

static bb_value_t bcm2835gpio_read ( void  )

static

Definition at line 185 of file bcm2835gpio.c.

References adapter_gpio_config::active_low, ADAPTER_GPIO_IDX_TDO, BB_HIGH, BB_LOW, GPIO_LEV, and adapter_gpio_config::gpio_num.

bcm2835gpio_reset()

static int bcm2835gpio_reset ( int  trst, int  srst  )

static

Definition at line 242 of file bcm2835gpio.c.

References ADAPTER_GPIO_IDX_SRST, ADAPTER_GPIO_IDX_TRST, ERROR_OK, is_gpio_config_valid(), LOG_DEBUG, and set_gpio_value().

bcm2835gpio_speed()

static int bcm2835gpio_speed ( int  speed )

static

Definition at line 306 of file bcm2835gpio.c.

References ERROR_OK, and jtag_delay.

bcm2835gpio_speed_div()

static int bcm2835gpio_speed_div ( int  speed, int *  khz  )

static

Definition at line 298 of file bcm2835gpio.c.

References ERROR_OK, speed_coeff, and speed_offset.

bcm2835gpio_swd_mode_possible()

static bool bcm2835gpio_swd_mode_possible ( void  )

static

Definition at line 400 of file bcm2835gpio.c.

References ADAPTER_GPIO_IDX_SWCLK, ADAPTER_GPIO_IDX_SWDIO, and is_gpio_config_valid().

Referenced by bcm2835gpio_init().

bcm2835gpio_swd_write_fast()

static int bcm2835gpio_swd_write_fast ( int  swclk, int  swdio  )

static

Definition at line 211 of file bcm2835gpio.c.

References adapter_gpio_config::active_low, ADAPTER_GPIO_IDX_SWCLK, ADAPTER_GPIO_IDX_SWDIO, bcm2835_delay(), bcm2835_gpio_synchronize(), ERROR_OK, GPIO_CLR, adapter_gpio_config::gpio_num, and GPIO_SET.

Referenced by bcm2835gpio_init().

bcm2835gpio_swd_write_generic()

static int bcm2835gpio_swd_write_generic ( int  swclk, int  swdio  )

static

Definition at line 231 of file bcm2835gpio.c.

References ADAPTER_GPIO_IDX_SWCLK, ADAPTER_GPIO_IDX_SWDIO, bcm2835_delay(), ERROR_OK, and set_gpio_value().

Referenced by bcm2835gpio_init().

bcm2835gpio_write()

static int bcm2835gpio_write ( int  tck, int  tms, int  tdi  )

static

Definition at line 192 of file bcm2835gpio.c.

References ADAPTER_GPIO_IDX_TCK, ADAPTER_GPIO_IDX_TDI, ADAPTER_GPIO_IDX_TMS, bcm2835_delay(), bcm2835_gpio_synchronize(), ERROR_OK, GPIO_CLR, adapter_gpio_config::gpio_num, and GPIO_SET.

COMMAND_HANDLER() [1/3]

COMMAND_HANDLER

(

bcm2835gpio_handle_peripheral_base

)

Definition at line 336 of file bcm2835gpio.c.

COMMAND_HANDLER() [2/3]

COMMAND_HANDLER

(

bcm2835gpio_handle_peripheral_mem_dev

)

Definition at line 324 of file bcm2835gpio.c.

References bcm2835_get_mem_dev(), bcm2835_peri_mem_dev, CMD, CMD_ARGC, CMD_ARGV, command_print(), and ERROR_OK.

COMMAND_HANDLER() [3/3]

COMMAND_HANDLER

(

bcm2835gpio_handle_speed_coeffs

)

Definition at line 312 of file bcm2835gpio.c.

References CMD, CMD_ARGC, CMD_ARGV, COMMAND_PARSE_NUMBER, command_print(), ERROR_OK, speed_coeff, and speed_offset.

initialize_gpio()

static void initialize_gpio ( enum adapter_gpio_config_index  idx )

static

Definition at line 149 of file bcm2835gpio.c.

References ADAPTER_GPIO_DRIVE_MODE_PUSH_PULL, adapter_gpio_get_name(), ADAPTER_GPIO_INIT_STATE_ACTIVE, ADAPTER_GPIO_INIT_STATE_INACTIVE, ADAPTER_GPIO_INIT_STATE_INPUT, ADAPTER_GPIO_PULL_NONE, bcm2835_gpio_synchronize(), GPIO_LEV, adapter_gpio_config::gpio_num, INP_GPIO, is_gpio_config_valid(), LOG_DEBUG, LOG_WARNING, initial_gpio_state::mode, mode, MODE_GPIO, OUT_GPIO, initial_gpio_state::output_level, and set_gpio_value().

Referenced by bcm2835gpio_init().

is_gpio_config_valid()

static bool is_gpio_config_valid ( enum adapter_gpio_config_index  idx )

static

Definition at line 96 of file bcm2835gpio.c.

References adapter_gpio_config::gpio_num.

Referenced by bcm2835_swdio_drive(), bcm2835gpio_jtag_mode_possible(), bcm2835gpio_reset(), bcm2835gpio_swd_mode_possible(), initialize_gpio(), and restore_gpio().

restore_gpio()

static void restore_gpio ( enum adapter_gpio_config_index  idx )

static

Definition at line 135 of file bcm2835gpio.c.

References BCM2835_GPIO_MODE_OUTPUT, bcm2835_gpio_synchronize(), GPIO_CLR, adapter_gpio_config::gpio_num, GPIO_SET, is_gpio_config_valid(), mode, and SET_MODE_GPIO.

Referenced by bcm2835gpio_quit().

set_gpio_value()

static void set_gpio_value ( const struct adapter_gpio_config *  gpio_config, int  value  )

static

Definition at line 102 of file bcm2835gpio.c.

References adapter_gpio_config::active_low, ADAPTER_GPIO_DRIVE_MODE_OPEN_DRAIN, ADAPTER_GPIO_DRIVE_MODE_OPEN_SOURCE, ADAPTER_GPIO_DRIVE_MODE_PUSH_PULL, bcm2835_gpio_synchronize(), adapter_gpio_config::drive, GPIO_CLR, adapter_gpio_config::gpio_num, GPIO_SET, INP_GPIO, and OUT_GPIO.

Referenced by bcm2835_swdio_drive(), bcm2835gpio_reset(), bcm2835gpio_swd_write_generic(), and initialize_gpio().

Variable Documentation

adapter_gpio_config

const struct adapter_gpio_config* adapter_gpio_config

static

Definition at line 66 of file bcm2835gpio.c.

bcm2835_peri_base

off_t bcm2835_peri_base = 0x20000000

static

Definition at line 23 of file bcm2835gpio.c.

bcm2835_peri_mem_dev

char* bcm2835_peri_mem_dev

static

Definition at line 22 of file bcm2835gpio.c.

Referenced by bcm2835_get_mem_dev(), bcm2835gpio_quit(), and COMMAND_HANDLER().

bcm2835_transports

const char* const bcm2835_transports[] = { "jtag", "swd", NULL }

static

Definition at line 581 of file bcm2835gpio.c.

bcm2835gpio_adapter_driver

struct adapter_driver bcm2835gpio_adapter_driver

Initial value:

= {
    .name = "bcm2835gpio",
    .transports = bcm2835_transports,
    .commands = bcm2835gpio_command_handlers,
 
    .init = bcm2835gpio_init,
    .quit = bcm2835gpio_quit,
    .reset = bcm2835gpio_reset,
    .speed = bcm2835gpio_speed,
    .khz = bcm2835gpio_khz,
    .speed_div = bcm2835gpio_speed_div,
 
    .jtag_ops = &bcm2835gpio_interface,
    .swd_ops = &bitbang_swd,
}

Definition at line 581 of file bcm2835gpio.c.

bcm2835gpio_bitbang

struct bitbang_interface bcm2835gpio_bitbang

static

Initial value:

= {
    .read = bcm2835gpio_read,
    .write = bcm2835gpio_write,
    .swdio_read = bcm2835_swdio_read,
    .swdio_drive = bcm2835_swdio_drive,
    .swd_write = bcm2835gpio_swd_write_generic,
    .blink = bcm2835gpio_blink,
}

Definition at line 422 of file bcm2835gpio.c.

Referenced by bcm2835gpio_init().

bcm2835gpio_command_handlers

const struct command_registration bcm2835gpio_command_handlers[]

static

Initial value:

= {
    {
        .name = "bcm2835gpio",
        .mode = COMMAND_ANY,
        .help = "perform bcm2835gpio management",
        .chain = bcm2835gpio_subcommand_handlers,
        .usage = "",
    },
    COMMAND_REGISTRATION_DONE
}

Definition at line 336 of file bcm2835gpio.c.

bcm2835gpio_interface

struct jtag_interface bcm2835gpio_interface

static

Initial value:

= {
    .supported = DEBUG_CAP_TMS_SEQ,
    .execute_queue = bitbang_execute_queue,
}

Definition at line 581 of file bcm2835gpio.c.

bcm2835gpio_subcommand_handlers

const struct command_registration bcm2835gpio_subcommand_handlers[]

static

Initial value:

= {
    {
        .name = "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 = "peripheral_mem_dev",
        .handler = &bcm2835gpio_handle_peripheral_mem_dev,
        .mode = COMMAND_CONFIG,
        .help = "device to map memory mapped GPIOs from.",
        .usage = "[device]",
    },
    {
        .name = "peripheral_base",
        .handler = &bcm2835gpio_handle_peripheral_base,
        .mode = COMMAND_CONFIG,
        .help = "peripheral base to access GPIOs, not needed with /dev/gpiomem.",
        .usage = "[base]",
    },
 
    COMMAND_REGISTRATION_DONE
}

Definition at line 336 of file bcm2835gpio.c.

dev_mem_fd

int dev_mem_fd

static

Definition at line 57 of file bcm2835gpio.c.

Referenced by bcm2835gpio_init().

initial_drive_strength_etc

uint32_t initial_drive_strength_etc

static

Definition at line 71 of file bcm2835gpio.c.

Referenced by bcm2835gpio_init(), and bcm2835gpio_quit().

initial_gpio_state

struct initial_gpio_state initial_gpio_state[ADAPTER_GPIO_IDX_NUM]

static

jtag_delay

unsigned int jtag_delay

static

Definition at line 64 of file bcm2835gpio.c.

Referenced by bcm2835_delay(), and bcm2835gpio_speed().

pads_base

volatile uint32_t* pads_base = MAP_FAILED

static

Definition at line 59 of file bcm2835gpio.c.

Referenced by bcm2835gpio_init(), bcm2835gpio_munmap(), and bcm2835gpio_quit().

pio_base

volatile uint32_t* pio_base = MAP_FAILED

static

Definition at line 58 of file bcm2835gpio.c.

Referenced by bcm2835gpio_init(), and bcm2835gpio_munmap().

speed_coeff

int speed_coeff = 113714

static

Definition at line 62 of file bcm2835gpio.c.

Referenced by bcm2835gpio_khz(), bcm2835gpio_speed_div(), and COMMAND_HANDLER().

speed_offset

int speed_offset = 28

static

Definition at line 63 of file bcm2835gpio.c.

Referenced by bcm2835gpio_khz(), bcm2835gpio_speed_div(), and COMMAND_HANDLER().