/**
* @brief Hardware initialization
*
* The function initializes the GPIO pins used in the bit-bang interface and
* also assigned a default output value for SPI signal.
*
* @param dev pointer to structure of device data
* @return 0 on success, negative errno on error
*/
static int tsb_spi_hw_init(struct device *dev)
{
struct tsb_spi_info *info = NULL;
int i = 0;
int retval;
/* check input parameters */
if (!dev || !device_get_private(dev)) {
return -EINVAL;
}
info = device_get_private(dev);
retval = tsb_request_pinshare(TSB_PIN_GPIO10);
if (retval) {
lowsyslog("SPI: cannot get ownership of GPIO10 pin.\n");
return retval;
}
/* backup pinshare#5 setting */
info->pinshare = tsb_get_pinshare();
/* set pinshare#5 (DBG) to normal GPIO */
if (!(info->pinshare & TSB_PIN_GPIO10)) {
tsb_set_pinshare(TSB_PIN_GPIO10);
}
/* setup GPIO pins */
gpio_activate(SPI_SCK);
gpio_direction_out(SPI_SCK, 0);
gpio_activate(SPI_SDI);
gpio_direction_in(SPI_SDI);
gpio_activate(SPI_SDO);
gpio_direction_out(SPI_SDO, 0);
/* setup all chip-select pins */
for (i = 0; i < info->caps.csnum; i++) {
gpio_activate(info->chipselect[i]);
gpio_direction_out(info->chipselect[i], 1);
}
return 0;
}
/**
* Initialise an I2C device
*/
struct i2c_dev_s *up_i2cinitialize(int port)
{
irqstate_t flags;
int retval;
i2cvdbg("Init I2C port %d\n", port);
/* Only one I2C port on TSB */
if (port > 0)
return NULL;
flags = irqsave();
if (refcount++)
goto out;
retval = tsb_request_pinshare(TSB_PIN_GPIO21 | TSB_PIN_GPIO22);
if (retval) {
lowsyslog("I2C: cannot get ownership of I2C pins\n");
goto err_req_pinshare;
}
sem_init(&g_mutex, 0, 1);
sem_init(&g_wait, 0, 0);
/* enable I2C pins */
tsb_clr_pinshare(TSB_PIN_GPIO21);
tsb_clr_pinshare(TSB_PIN_GPIO22);
/* enable I2C clocks */
tsb_clk_enable(TSB_CLK_I2CP);
tsb_clk_enable(TSB_CLK_I2CS);
/* reset I2C module */
tsb_reset(TSB_RST_I2CP);
tsb_reset(TSB_RST_I2CS);
/* Initialize the I2C controller */
tsb_i2c_init();
/* Allocate a watchdog timer */
g_timeout = wd_create();
DEBUGASSERT(g_timeout != 0);
/* Attach Interrupt Handler */
irq_attach(TSB_IRQ_I2C, i2c_interrupt);
/* Enable Interrupt Handler */
up_enable_irq(TSB_IRQ_I2C);
/* Install our operations */
g_dev.ops = &dev_i2c_ops;
out:
irqrestore(flags);
return &g_dev;
err_req_pinshare:
refcount--;
irqrestore(flags);
return NULL;
}
