void init_STEPPERS(void) {
// set the stepper STEP and DIR pins to GPIO output 4ma 3.3v
HW_PINCTRL_MUXSEL0_SET(MUX0_PINS);
HW_PINCTRL_MUXSEL1_SET(MUX1_PINS);
HW_PINCTRL_DRIVE0_CLR(DRIVE0_MA_PINS);
HW_PINCTRL_DRIVE2_CLR(DRIVE2_MA_PINS);
HW_PINCTRL_DRIVE3_CLR(DRIVE3_MA_PINS);
HW_PINCTRL_DRIVE0_SET(DRIVE0_V_PINS);
HW_PINCTRL_DRIVE2_SET(DRIVE2_V_PINS);
HW_PINCTRL_DRIVE3_SET(DRIVE3_V_PINS);
HW_PINCTRL_DOUT0_CLR(STEP_PINS | DIR_PINS);
HW_PINCTRL_DOE3_SET(STEP_PINS | DIR_PINS);
}
void init_SPI_PINS(void) {
// select the pins we need as GPIO
HW_PINCTRL_MUXSEL1_SET(MOSI_MUX | SCK_MUX | RCK32_MUX | RCK16_MUX);
// set the drive current
HW_PINCTRL_DRIVE3_CLR(MOSI_MA | SCK_MA | RCK32_MA);
HW_PINCTRL_DRIVE2_CLR(RCK16_MA);
//set the drive voltage
HW_PINCTRL_DRIVE3_SET(MOSI_V | SCK_V | RCK32_V);
HW_PINCTRL_DRIVE2_SET(RCK16_V);
// set the pins as outputs and set the initial values to zero
HW_PINCTRL_DOUT0_CLR(MOSI_PIN|SCK_PIN|RCK32_PIN|RCK16_PIN);
// enable the pins
HW_PINCTRL_DOE0_SET(MOSI_PIN|SCK_PIN|RCK32_PIN|RCK16_PIN);
}
/* called during probe() after chip reset completes */
static int ehci_fsl_setup(struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
int retval;
struct fsl_usb2_platform_data *pdata;
pdata = hcd->self.controller->platform_data;
ehci->big_endian_desc = pdata->big_endian_desc;
ehci->big_endian_mmio = pdata->big_endian_mmio;
/* EHCI registers start at offset 0x100 */
ehci->caps = hcd->regs + 0x100;
ehci->regs = hcd->regs + 0x100 +
HC_LENGTH(ehci_readl(ehci, &ehci->caps->hc_capbase));
dbg_hcs_params(ehci, "reset");
dbg_hcc_params(ehci, "reset");
/* cache this readonly data; minimize chip reads */
ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
retval = ehci_halt(ehci);
/* data structure init */
retval = ehci_init(hcd);
if (retval)
return retval;
hcd->has_tt = 1;
ehci->sbrn = 0x20;
ehci_reset(ehci);
retval = ehci_fsl_reinit(ehci);
#ifdef CHUMBY_USB_MODIFICATIONS
/* Also, disable the IRQ for the 5V line. Turning on the screen causes
* a massive drop in power, and the battery circuitry thinks we've
* pulled the 5V line.
*/
HW_POWER_CTRL_CLR(1);
/* Wait just enough time for the brownout. Any less than this and it
* reboots when we bring the USB card up, or segfaults.
*/
msleep(5);
/* Set bank 0, pins 26 and 28 to GPIO. */
HW_PINCTRL_MUXSEL1_SET(0x03300000);
/* Set both pins to low, which ensures a reset takes place. */
HW_PINCTRL_DOUT0_CLR(0x24000000);
HW_PINCTRL_DOE0_SET(0x24000000);
HW_PINCTRL_DOUT0_CLR(0x24000000);
msleep(5);
/* Delay for one second, giving most USB devices the chance to
* recognize they've been "unplugged".
*/
msleep(1000);
/* Write a "1" to bank 0, pin 28. */
HW_PINCTRL_DOUT0_SET(0x20000000);
msleep(5);
/* Write a "1" to bank 0, pin 26, to disable USB. This ensures a reset.
* Wait a short time after, then re-enable the IRQ that fires when power
* is pulled. This is because by now, the voltages should have
* stabilized.
*/
HW_PINCTRL_DOUT0_SET(0x04000000);
msleep(5);
/* Re-enable the power interrupt. */
HW_POWER_CTRL_SET(1);
#endif /*CHUMBY_USB_MODIFICATIONS*/
return retval;
}
