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pci: mx6: Implement power callback

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Implement a callback to toggle the slot power supply. The callback
can be overriden in case some more complex power supply for the slot
was implemented in hardware, yet for the usual case, one can define
a GPIO which toggles the power to the slot.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Liu Ying <Ying.Liu@freescale.com>
This commit is contained in:
Marek Vasut 2014-03-23 22:45:40 +01:00 committed by Stefano Babic
parent ed2f0e1ffa
commit a778aeae05
1 changed files with 12 additions and 1 deletions
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13
drivers/pci/pcie_imx.c
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@ -451,6 +451,17 @@ static int imx6_pcie_init_phy(void)
return 0;
}
__weak int imx6_pcie_toggle_power(void)
{
#ifdef CONFIG_PCIE_IMX_POWER_GPIO
gpio_direction_output(CONFIG_PCIE_IMX_POWER_GPIO, 0);
mdelay(20);
gpio_set_value(CONFIG_PCIE_IMX_POWER_GPIO, 1);
mdelay(20);
#endif
return 0;
}
__weak int imx6_pcie_toggle_reset(void)
{
/*
@ -496,7 +507,7 @@ static int imx6_pcie_deassert_core_reset(void)
{
struct iomuxc *iomuxc_regs = (struct iomuxc *)IOMUXC_BASE_ADDR;
/* FIXME: Power-up GPIO goes here. */
imx6_pcie_toggle_power();
/* Enable PCIe */
clrbits_le32(&iomuxc_regs->gpr[1], IOMUXC_GPR1_TEST_POWERDOWN);