[U-Boot] [PATCH 5/6] ARM: imx: vining2000: Repair PCIe support

[Marek Vasut]

Ever since the conversion to DM PCI, the board was missing the PCIe DT
nodes, hence the PCI did not really work. Fill in the DT nodes and add
missing PCIe device reset.

Moreover, bring the PCIe power domain up before booting Linux. This is
mandatory to keep old broken vendor kernels working, as they do not do
so and depend on the bootloader to bring the power domain up.

Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Fabio Estevam <fabio.estevam at nxp.com>
Cc: Silvio Fricke <silvio.fricke at softing.com>
Cc: Stefano Babic <sbabic at denx.de>
---
 arch/arm/dts/imx6sx-softing-vining-2000.dts | 17 +++++++++++++
 board/softing/vining_2000/vining_2000.c     | 28 +++++++++++++++++++++
 2 files changed, 45 insertions(+)

diff --git a/arch/arm/dts/imx6sx-softing-vining-2000.dts b/arch/arm/dts/imx6sx-softing-vining-2000.dts
index 371890ff60..78dd5755a3 100644
--- a/arch/arm/dts/imx6sx-softing-vining-2000.dts
+++ b/arch/arm/dts/imx6sx-softing-vining-2000.dts
@@ -270,6 +270,17 @@
 	status = "okay";
 };
 
+&reg_pcie {
+	regulator-always-on;
+};
+
+&pcie {
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_pcie>;
+	reset-gpio = <&gpio4 6 GPIO_ACTIVE_HIGH>;
+	status = "okay";
+};
+
 &iomuxc {
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_gpios>;
@@ -360,6 +371,12 @@
 		>;
 	};
 
+	pinctrl_pcie: pciegrp {
+		fsl,pins = <
+			MX6SX_PAD_NAND_DATA02__GPIO4_IO_6	0x10b0
+		>;
+	};
+
 	pinctrl_pwm1: pwm1grp-1 {
 		fsl,pins = <
 			/* blue LED */
diff --git a/board/softing/vining_2000/vining_2000.c b/board/softing/vining_2000/vining_2000.c
index 83a4d9debe..5da1e620e6 100644
--- a/board/softing/vining_2000/vining_2000.c
+++ b/board/softing/vining_2000/vining_2000.c
@@ -405,6 +405,19 @@ int checkboard(void)
 	return 0;
 }
 
+#define PCIE_PHY_PUP_REQ		BIT(7)
+
+void board_preboot_os(void)
+{
+	struct iomuxc *iomuxc_regs = (struct iomuxc *)IOMUXC_BASE_ADDR;
+	struct gpc *gpc_regs = (struct gpc *)GPC_BASE_ADDR;
+
+	/* Bring the PCI power domain up, so that old vendorkernel works. */
+	setbits_le32(&iomuxc_regs->gpr[12], IOMUXC_GPR12_TEST_POWERDOWN);
+	setbits_le32(&iomuxc_regs->gpr[5], IOMUXC_GPR5_PCIE_BTNRST);
+	setbits_le32(&gpc_regs->cntr, PCIE_PHY_PUP_REQ);
+}
+
 #ifdef CONFIG_SPL_BUILD
 #include <linux/libfdt.h>
 #include <spl.h>
@@ -412,6 +425,10 @@ int checkboard(void)
 
 static struct fsl_esdhc_cfg usdhc_cfg = { USDHC4_BASE_ADDR };
 
+static iomux_v3_cfg_t const pcie_pads[] = {
+	MX6_PAD_NAND_DATA02__GPIO4_IO_6 | MUX_PAD_CTRL(GPIO_PAD_CTRL),
+};
+
 static iomux_v3_cfg_t const uart_pads[] = {
 	MX6_PAD_GPIO1_IO04__UART1_TX | MUX_PAD_CTRL(UART_PAD_CTRL),
 	MX6_PAD_GPIO1_IO05__UART1_RX | MUX_PAD_CTRL(UART_PAD_CTRL),
@@ -430,6 +447,11 @@ static iomux_v3_cfg_t const usdhc4_pads[] = {
 	MX6_PAD_SD4_DATA7__USDHC4_DATA7 | MUX_PAD_CTRL(USDHC_PAD_CTRL),
 };
 
+static void vining2000_spl_setup_iomux_pcie(void)
+{
+	imx_iomux_v3_setup_multiple_pads(pcie_pads, ARRAY_SIZE(pcie_pads));
+}
+
 static void vining2000_spl_setup_iomux_uart(void)
 {
 	imx_iomux_v3_setup_multiple_pads(uart_pads, ARRAY_SIZE(uart_pads));
@@ -573,11 +595,17 @@ void board_init_f(ulong dummy)
 	ccgr_init();
 
 	/* iomux setup */
+	vining2000_spl_setup_iomux_pcie();
 	vining2000_spl_setup_iomux_uart();
 
 	/* setup GP timer */
 	timer_init();
 
+	/* reset the PCIe device */
+	gpio_set_value(IMX_GPIO_NR(4, 6), 1);
+	udelay(50);
+	gpio_set_value(IMX_GPIO_NR(4, 6), 0);
+
 	/* UART clocks enabled and gd valid - init serial console */
 	preloader_console_init();
 
-- 
2.24.0