pci: tegra: Add Tegra PCIe driver

Add support for the PCIe controller found on some generations of Tegra.
Tegra20 has 2 root ports with a total of 4 lanes, Tegra30 has 3 root
ports with a total of 6 lanes and Tegra124 has 2 root ports with a total
of 5 lanes.

This is based on the Linux kernel driver, originally submitted upstream
by Mike Rapoport.

Signed-off-by: Mike Rapoport <mike@compulab.co.il>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>

1 files changed, 1143 insertions, 0 deletions

diff --git a/drivers/pci/pci_tegra.c b/drivers/pci/pci_tegra.c
new file mode 100644
index 0000000000..a03ad5ff1f
--- /dev/null
+++ b/drivers/pci/pci_tegra.c
@@ -0,0 +1,1143 @@
+/*
+ * Copyright (c) 2010, CompuLab, Ltd.
+ * Author: Mike Rapoport <mike@compulab.co.il>
+ *
+ * Based on NVIDIA PCIe driver
+ * Copyright (c) 2008-2009, NVIDIA Corporation.
+ *
+ * Copyright (c) 2013-2014, NVIDIA Corporation.
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ */
+
+#define DEBUG
+#define pr_fmt(fmt) "tegra-pcie: " fmt
+
+#include <common.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <malloc.h>
+#include <pci.h>
+
+#include <asm/io.h>
+#include <asm/gpio.h>
+
+#include <asm/arch/clock.h>
+#include <asm/arch/powergate.h>
+#include <asm/arch-tegra/xusb-padctl.h>
+
+#include <linux/list.h>
+
+#include <dt-bindings/pinctrl/pinctrl-tegra-xusb.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define AFI_AXI_BAR0_SZ	0x00
+#define AFI_AXI_BAR1_SZ	0x04
+#define AFI_AXI_BAR2_SZ	0x08
+#define AFI_AXI_BAR3_SZ	0x0c
+#define AFI_AXI_BAR4_SZ	0x10
+#define AFI_AXI_BAR5_SZ	0x14
+
+#define AFI_AXI_BAR0_START	0x18
+#define AFI_AXI_BAR1_START	0x1c
+#define AFI_AXI_BAR2_START	0x20
+#define AFI_AXI_BAR3_START	0x24
+#define AFI_AXI_BAR4_START	0x28
+#define AFI_AXI_BAR5_START	0x2c
+
+#define AFI_FPCI_BAR0	0x30
+#define AFI_FPCI_BAR1	0x34
+#define AFI_FPCI_BAR2	0x38
+#define AFI_FPCI_BAR3	0x3c
+#define AFI_FPCI_BAR4	0x40
+#define AFI_FPCI_BAR5	0x44
+
+#define AFI_CACHE_BAR0_SZ	0x48
+#define AFI_CACHE_BAR0_ST	0x4c
+#define AFI_CACHE_BAR1_SZ	0x50
+#define AFI_CACHE_BAR1_ST	0x54
+
+#define AFI_MSI_BAR_SZ		0x60
+#define AFI_MSI_FPCI_BAR_ST	0x64
+#define AFI_MSI_AXI_BAR_ST	0x68
+
+#define AFI_CONFIGURATION		0xac
+#define  AFI_CONFIGURATION_EN_FPCI	(1 << 0)
+
+#define AFI_FPCI_ERROR_MASKS	0xb0
+
+#define AFI_INTR_MASK		0xb4
+#define  AFI_INTR_MASK_INT_MASK	(1 << 0)
+#define  AFI_INTR_MASK_MSI_MASK	(1 << 8)
+
+#define AFI_SM_INTR_ENABLE	0xc4
+#define  AFI_SM_INTR_INTA_ASSERT	(1 << 0)
+#define  AFI_SM_INTR_INTB_ASSERT	(1 << 1)
+#define  AFI_SM_INTR_INTC_ASSERT	(1 << 2)
+#define  AFI_SM_INTR_INTD_ASSERT	(1 << 3)
+#define  AFI_SM_INTR_INTA_DEASSERT	(1 << 4)
+#define  AFI_SM_INTR_INTB_DEASSERT	(1 << 5)
+#define  AFI_SM_INTR_INTC_DEASSERT	(1 << 6)
+#define  AFI_SM_INTR_INTD_DEASSERT	(1 << 7)
+
+#define AFI_AFI_INTR_ENABLE		0xc8
+#define  AFI_INTR_EN_INI_SLVERR		(1 << 0)
+#define  AFI_INTR_EN_INI_DECERR		(1 << 1)
+#define  AFI_INTR_EN_TGT_SLVERR		(1 << 2)
+#define  AFI_INTR_EN_TGT_DECERR		(1 << 3)
+#define  AFI_INTR_EN_TGT_WRERR		(1 << 4)
+#define  AFI_INTR_EN_DFPCI_DECERR	(1 << 5)
+#define  AFI_INTR_EN_AXI_DECERR		(1 << 6)
+#define  AFI_INTR_EN_FPCI_TIMEOUT	(1 << 7)
+#define  AFI_INTR_EN_PRSNT_SENSE	(1 << 8)
+
+#define AFI_PCIE_CONFIG					0x0f8
+#define  AFI_PCIE_CONFIG_PCIE_DISABLE(x)		(1 << ((x) + 1))
+#define  AFI_PCIE_CONFIG_PCIE_DISABLE_ALL		0xe
+#define  AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK	(0xf << 20)
+#define  AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE	(0x0 << 20)
+#define  AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420	(0x0 << 20)
+#define  AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X2_X1	(0x0 << 20)
+#define  AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL	(0x1 << 20)
+#define  AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_222	(0x1 << 20)
+#define  AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X4_X1	(0x1 << 20)
+#define  AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411	(0x2 << 20)
+
+#define AFI_FUSE			0x104
+#define  AFI_FUSE_PCIE_T0_GEN2_DIS	(1 << 2)
+
+#define AFI_PEX0_CTRL			0x110
+#define AFI_PEX1_CTRL			0x118
+#define AFI_PEX2_CTRL			0x128
+#define  AFI_PEX_CTRL_RST		(1 << 0)
+#define  AFI_PEX_CTRL_CLKREQ_EN		(1 << 1)
+#define  AFI_PEX_CTRL_REFCLK_EN		(1 << 3)
+#define  AFI_PEX_CTRL_OVERRIDE_EN	(1 << 4)
+
+#define AFI_PLLE_CONTROL		0x160
+#define  AFI_PLLE_CONTROL_BYPASS_PADS2PLLE_CONTROL (1 << 9)
+#define  AFI_PLLE_CONTROL_PADS2PLLE_CONTROL_EN (1 << 1)
+
+#define AFI_PEXBIAS_CTRL_0		0x168
+
+#define PADS_CTL_SEL		0x0000009C
+
+#define PADS_CTL		0x000000A0
+#define  PADS_CTL_IDDQ_1L	(1 <<  0)
+#define  PADS_CTL_TX_DATA_EN_1L	(1 <<  6)
+#define  PADS_CTL_RX_DATA_EN_1L	(1 << 10)
+
+#define PADS_PLL_CTL_TEGRA20			0x000000B8
+#define PADS_PLL_CTL_TEGRA30			0x000000B4
+#define  PADS_PLL_CTL_RST_B4SM			(0x1 <<  1)
+#define  PADS_PLL_CTL_LOCKDET			(0x1 <<  8)
+#define  PADS_PLL_CTL_REFCLK_MASK		(0x3 << 16)
+#define  PADS_PLL_CTL_REFCLK_INTERNAL_CML	(0x0 << 16)
+#define  PADS_PLL_CTL_REFCLK_INTERNAL_CMOS	(0x1 << 16)
+#define  PADS_PLL_CTL_REFCLK_EXTERNAL		(0x2 << 16)
+#define  PADS_PLL_CTL_TXCLKREF_MASK		(0x1 << 20)
+#define  PADS_PLL_CTL_TXCLKREF_DIV10		(0x0 << 20)
+#define  PADS_PLL_CTL_TXCLKREF_DIV5		(0x1 << 20)
+#define  PADS_PLL_CTL_TXCLKREF_BUF_EN		(0x1 << 22)
+
+#define PADS_REFCLK_CFG0			0x000000C8
+#define PADS_REFCLK_CFG1			0x000000CC
+
+/*
+ * Fields in PADS_REFCLK_CFG*. Those registers form an array of 16-bit
+ * entries, one entry per PCIe port. These field definitions and desired
+ * values aren't in the TRM, but do come from NVIDIA.
+ */
+#define PADS_REFCLK_CFG_TERM_SHIFT		2  /* 6:2 */
+#define PADS_REFCLK_CFG_E_TERM_SHIFT		7
+#define PADS_REFCLK_CFG_PREDI_SHIFT		8  /* 11:8 */
+#define PADS_REFCLK_CFG_DRVI_SHIFT		12 /* 15:12 */
+
+/* Default value provided by HW engineering is 0xfa5c */
+#define PADS_REFCLK_CFG_VALUE \
+	( \
+		(0x17 << PADS_REFCLK_CFG_TERM_SHIFT)   | \
+		(0    << PADS_REFCLK_CFG_E_TERM_SHIFT) | \
+		(0xa  << PADS_REFCLK_CFG_PREDI_SHIFT)  | \
+		(0xf  << PADS_REFCLK_CFG_DRVI_SHIFT)     \
+	)
+
+#define RP_VEND_XP	0x00000F00
+#define  RP_VEND_XP_DL_UP	(1 << 30)
+
+#define RP_PRIV_MISC	0x00000FE0
+#define  RP_PRIV_MISC_PRSNT_MAP_EP_PRSNT (0xE << 0)
+#define  RP_PRIV_MISC_PRSNT_MAP_EP_ABSNT (0xF << 0)
+
+#define RP_LINK_CONTROL_STATUS			0x00000090
+#define  RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE	0x20000000
+#define  RP_LINK_CONTROL_STATUS_LINKSTAT_MASK	0x3fff0000
+
+struct tegra_pcie;
+
+struct tegra_pcie_port {
+	struct tegra_pcie *pcie;
+
+	struct fdt_resource regs;
+	unsigned int num_lanes;
+	unsigned int index;
+
+	struct list_head list;
+};
+
+struct tegra_pcie_soc {
+	unsigned int num_ports;
+	unsigned long pads_pll_ctl;
+	unsigned long tx_ref_sel;
+	bool has_pex_clkreq_en;
+	bool has_pex_bias_ctrl;
+	bool has_cml_clk;
+	bool has_gen2;
+};
+
+struct tegra_pcie {
+	struct pci_controller hose;
+
+	struct fdt_resource pads;
+	struct fdt_resource afi;
+	struct fdt_resource cs;
+
+	struct fdt_resource prefetch;
+	struct fdt_resource mem;
+	struct fdt_resource io;
+
+	struct list_head ports;
+	unsigned long xbar;
+
+	const struct tegra_pcie_soc *soc;
+	struct tegra_xusb_phy *phy;
+};
+
+static inline struct tegra_pcie *to_tegra_pcie(struct pci_controller *hose)
+{
+	return container_of(hose, struct tegra_pcie, hose);
+}
+
+static void afi_writel(struct tegra_pcie *pcie, unsigned long value,
+		       unsigned long offset)
+{
+	writel(value, pcie->afi.start + offset);
+}
+
+static unsigned long afi_readl(struct tegra_pcie *pcie, unsigned long offset)
+{
+	return readl(pcie->afi.start + offset);
+}
+
+static void pads_writel(struct tegra_pcie *pcie, unsigned long value,
+			unsigned long offset)
+{
+	writel(value, pcie->pads.start + offset);
+}
+
+static unsigned long pads_readl(struct tegra_pcie *pcie, unsigned long offset)
+{
+	return readl(pcie->pads.start + offset);
+}
+
+static unsigned long rp_readl(struct tegra_pcie_port *port,
+			      unsigned long offset)
+{
+	return readl(port->regs.start + offset);
+}
+
+static void rp_writel(struct tegra_pcie_port *port, unsigned long value,
+		      unsigned long offset)
+{
+	writel(value, port->regs.start + offset);
+}
+
+static unsigned long tegra_pcie_conf_offset(pci_dev_t bdf, int where)
+{
+	return ((where & 0xf00) << 16) | (PCI_BUS(bdf) << 16) |
+	       (PCI_DEV(bdf) << 11) | (PCI_FUNC(bdf) << 8) |
+	       (where & 0xfc);
+}
+
+static int tegra_pcie_conf_address(struct tegra_pcie *pcie, pci_dev_t bdf,
+				   int where, unsigned long *address)
+{
+	unsigned int bus = PCI_BUS(bdf);
+
+	if (bus == 0) {
+		unsigned int dev = PCI_DEV(bdf);
+		struct tegra_pcie_port *port;
+
+		list_for_each_entry(port, &pcie->ports, list) {
+			if (port->index + 1 == dev) {
+				*address = port->regs.start + (where & ~3);
+				return 0;
+			}
+		}
+	} else {
+		*address = pcie->cs.start + tegra_pcie_conf_offset(bdf, where);
+		return 0;
+	}
+
+	return -1;
+}
+
+static int tegra_pcie_read_conf(struct pci_controller *hose, pci_dev_t bdf,
+				int where, u32 *value)
+{
+	struct tegra_pcie *pcie = to_tegra_pcie(hose);
+	unsigned long address;
+	int err;
+
+	err = tegra_pcie_conf_address(pcie, bdf, where, &address);
+	if (err < 0) {
+		*value = 0xffffffff;
+		return 1;
+	}
+
+	*value = readl(address);
+
+	/* fixup root port class */
+	if (PCI_BUS(bdf) == 0) {
+		if (where == PCI_CLASS_REVISION) {
+			*value &= ~0x00ff0000;
+			*value |= PCI_CLASS_BRIDGE_PCI << 16;
+		}
+	}
+
+	return 0;
+}
+
+static int tegra_pcie_write_conf(struct pci_controller *hose, pci_dev_t bdf,
+				 int where, u32 value)
+{
+	struct tegra_pcie *pcie = to_tegra_pcie(hose);
+	unsigned long address;
+	int err;
+
+	err = tegra_pcie_conf_address(pcie, bdf, where, &address);
+	if (err < 0)
+		return 1;
+
+	writel(value, address);
+
+	return 0;
+}
+
+static int tegra_pcie_port_parse_dt(const void *fdt, int node,
+				    struct tegra_pcie_port *port)
+{
+	const u32 *addr;
+	int len;
+
+	addr = fdt_getprop(fdt, node, "assigned-addresses", &len);
+	if (!addr) {
+		error("property \"assigned-addresses\" not found");
+		return -FDT_ERR_NOTFOUND;
+	}
+
+	port->regs.start = fdt32_to_cpu(addr[2]);
+	port->regs.end = port->regs.start + fdt32_to_cpu(addr[4]);
+
+	return 0;
+}
+
+static int tegra_pcie_get_xbar_config(const void *fdt, int node, u32 lanes,
+				      unsigned long *xbar)
+{
+	enum fdt_compat_id id = fdtdec_lookup(fdt, node);
+
+	switch (id) {
+	case COMPAT_NVIDIA_TEGRA20_PCIE:
+		switch (lanes) {
+		case 0x00000004:
+			debug("single-mode configuration\n");
+			*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_SINGLE;
+			return 0;
+
+		case 0x00000202:
+			debug("dual-mode configuration\n");
+			*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_DUAL;
+			return 0;
+		}
+		break;
+
+	case COMPAT_NVIDIA_TEGRA30_PCIE:
+		switch (lanes) {
+		case 0x00000204:
+			debug("4x1, 2x1 configuration\n");
+			*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_420;
+			return 0;
+
+		case 0x00020202:
+			debug("2x3 configuration\n");
+			*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_222;
+			return 0;
+
+		case 0x00010104:
+			debug("4x1, 1x2 configuration\n");
+			*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_411;
+			return 0;
+		}
+		break;
+
+	case COMPAT_NVIDIA_TEGRA124_PCIE:
+		switch (lanes) {
+		case 0x0000104:
+			debug("4x1, 1x1 configuration\n");
+			*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X4_X1;
+			return 0;
+
+		case 0x0000102:
+			debug("2x1, 1x1 configuration\n");
+			*xbar = AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_X2_X1;
+			return 0;
+		}
+		break;
+
+	default:
+		break;
+	}
+
+	return -FDT_ERR_NOTFOUND;
+}
+
+static int tegra_pcie_parse_dt_ranges(const void *fdt, int node,
+				      struct tegra_pcie *pcie)
+{
+	const u32 *ptr, *end;
+	int len;
+
+	ptr = fdt_getprop(fdt, node, "ranges", &len);
+	if (!ptr) {
+		error("missing \"ranges\" property");
+		return -FDT_ERR_NOTFOUND;
+	}
+
+	end = ptr + len / 4;
+
+	while (ptr < end) {
+		struct fdt_resource *res = NULL;
+		u32 space = fdt32_to_cpu(*ptr);
+
+		switch ((space >> 24) & 0x3) {
+		case 0x01:
+			res = &pcie->io;
+			break;
+
+		case 0x02: /* 32 bit */
+		case 0x03: /* 64 bit */
+			if (space & (1 << 30))
+				res = &pcie->prefetch;
+			else
+				res = &pcie->mem;
+
+			break;
+		}
+
+		if (res) {
+			res->start = fdt32_to_cpu(ptr[3]);
+			res->end = res->start + fdt32_to_cpu(ptr[5]);
+		}
+
+		ptr += 3 + 1 + 2;
+	}
+
+	debug("PCI regions:\n");
+	debug("  I/O: %#x-%#x\n", pcie->io.start, pcie->io.end);
+	debug("  non-prefetchable memory: %#x-%#x\n", pcie->mem.start,
+	      pcie->mem.end);
+	debug("  prefetchable memory: %#x-%#x\n", pcie->prefetch.start,
+	      pcie->prefetch.end);
+
+	return 0;
+}
+
+static int tegra_pcie_parse_port_info(const void *fdt, int node,
+				      unsigned int *index,
+				      unsigned int *lanes)
+{
+	pci_dev_t bdf;
+	int err;
+
+	err = fdtdec_get_int(fdt, node, "nvidia,num-lanes", 0);
+	if (err < 0) {
+		error("failed to parse \"nvidia,num-lanes\" property");
+		return err;
+	}
+
+	*lanes = err;
+
+	err = fdtdec_pci_get_bdf(fdt, node, &bdf);
+	if (err < 0) {
+		error("failed to parse \"reg\" property");
+		return err;
+	}
+
+	*index = PCI_DEV(bdf) - 1;
+
+	return 0;
+}
+
+static int tegra_pcie_parse_dt(const void *fdt, int node,
+			       struct tegra_pcie *pcie)
+{
+	int err, subnode;
+	u32 lanes = 0;
+
+	err = fdt_get_named_resource(fdt, node, "reg", "reg-names", "pads",
+				     &pcie->pads);
+	if (err < 0) {
+		error("resource \"pads\" not found");
+		return err;
+	}
+
+	err = fdt_get_named_resource(fdt, node, "reg", "reg-names", "afi",
+				     &pcie->afi);
+	if (err < 0) {
+		error("resource \"afi\" not found");
+		return err;
+	}
+
+	err = fdt_get_named_resource(fdt, node, "reg", "reg-names", "cs",
+				     &pcie->cs);
+	if (err < 0) {
+		error("resource \"cs\" not found");
+		return err;
+	}
+
+	pcie->phy = tegra_xusb_phy_get(TEGRA_XUSB_PADCTL_PCIE);
+	if (pcie->phy) {
+		err = tegra_xusb_phy_prepare(pcie->phy);
+		if (err < 0) {
+			error("failed to prepare PHY: %d", err);
+			return err;
+		}
+	}
+
+	err = tegra_pcie_parse_dt_ranges(fdt, node, pcie);
+	if (err < 0) {
+		error("failed to parse \"ranges\" property");
+		return err;
+	}
+
+	fdt_for_each_subnode(fdt, subnode, node) {
+		unsigned int index = 0, num_lanes = 0;
+		struct tegra_pcie_port *port;
+
+		err = tegra_pcie_parse_port_info(fdt, subnode, &index,
+						 &num_lanes);
+		if (err < 0) {
+			error("failed to obtain root port info");
+			continue;
+		}
+
+		lanes |= num_lanes << (index << 3);
+
+		if (!fdtdec_get_is_enabled(fdt, subnode))
+			continue;
+
+		port = malloc(sizeof(*port));
+		if (!port)
+			continue;
+
+		memset(port, 0, sizeof(*port));
+		port->num_lanes = num_lanes;
+		port->index = index;
+
+		err = tegra_pcie_port_parse_dt(fdt, subnode, port);
+		if (err < 0) {
+			free(port);
+			continue;
+		}
+
+		list_add_tail(&port->list, &pcie->ports);
+		port->pcie = pcie;
+	}
+
+	err = tegra_pcie_get_xbar_config(fdt, node, lanes, &pcie->xbar);
+	if (err < 0) {
+		error("invalid lane configuration");
+		return err;
+	}
+
+	return 0;
+}
+
+int __weak tegra_pcie_board_init(void)
+{
+	return 0;
+}
+
+static int tegra_pcie_power_on(struct tegra_pcie *pcie)
+{
+	const struct tegra_pcie_soc *soc = pcie->soc;
+	unsigned long value;
+	int err;
+
+	/* reset PCIEXCLK logic, AFI controller and PCIe controller */
+	reset_set_enable(PERIPH_ID_PCIEXCLK, 1);
+	reset_set_enable(PERIPH_ID_AFI, 1);
+	reset_set_enable(PERIPH_ID_PCIE, 1);
+
+	err = tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
+	if (err < 0) {
+		error("failed to power off PCIe partition: %d", err);
+		return err;
+	}
+
+	tegra_pcie_board_init();
+
+	err = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_PCIE,
+						PERIPH_ID_PCIE);
+	if (err < 0) {
+		error("failed to power up PCIe partition: %d", err);
+		return err;
+	}
+
+	/* take AFI controller out of reset */
+	reset_set_enable(PERIPH_ID_AFI, 0);
+
+	/* enable AFI clock */
+	clock_enable(PERIPH_ID_AFI);
+
+	if (soc->has_cml_clk) {
+		/* enable CML clock */
+		value = readl(NV_PA_CLK_RST_BASE + 0x48c);
+		value |= (1 << 0);
+		value &= ~(1 << 1);
+		writel(value, NV_PA_CLK_RST_BASE + 0x48c);
+	}
+
+	err = tegra_plle_enable();
+	if (err < 0) {
+		error("failed to enable PLLE: %d\n", err);
+		return err;
+	}
+
+	return 0;
+}
+
+static int tegra_pcie_pll_wait(struct tegra_pcie *pcie, unsigned long timeout)
+{
+	const struct tegra_pcie_soc *soc = pcie->soc;
+	unsigned long start = get_timer(0);
+	u32 value;
+
+	while (get_timer(start) < timeout) {
+		value = pads_readl(pcie, soc->pads_pll_ctl);
+		if (value & PADS_PLL_CTL_LOCKDET)
+			return 0;
+	}
+
+	return -ETIMEDOUT;
+}
+
+static int tegra_pcie_phy_enable(struct tegra_pcie *pcie)
+{
+	const struct tegra_pcie_soc *soc = pcie->soc;
+	u32 value;
+	int err;
+
+	/* initialize internal PHY, enable up to 16 PCIe lanes */
+	pads_writel(pcie, 0, PADS_CTL_SEL);
+
+	/* override IDDQ to 1 on all 4 lanes */
+	value = pads_readl(pcie, PADS_CTL);
+	value |= PADS_CTL_IDDQ_1L;
+	pads_writel(pcie, value, PADS_CTL);
+
+	/*
+	 * Set up PHY PLL inputs select PLLE output as refclock, set TX
+	 * ref sel to div10 (not div5).
+	 */
+	value = pads_readl(pcie, soc->pads_pll_ctl);
+	value &= ~(PADS_PLL_CTL_REFCLK_MASK | PADS_PLL_CTL_TXCLKREF_MASK);
+	value |= PADS_PLL_CTL_REFCLK_INTERNAL_CML | soc->tx_ref_sel;
+	pads_writel(pcie, value, soc->pads_pll_ctl);
+
+	/* reset PLL */
+	value = pads_readl(pcie, soc->pads_pll_ctl);
+	value &= ~PADS_PLL_CTL_RST_B4SM;
+	pads_writel(pcie, value, soc->pads_pll_ctl);
+
+	udelay(20);
+
+	/* take PLL out of reset */
+	value = pads_readl(pcie, soc->pads_pll_ctl);
+	value |= PADS_PLL_CTL_RST_B4SM;
+	pads_writel(pcie, value, soc->pads_pll_ctl);
+
+	/* configure the reference clock driver */
+	value = PADS_REFCLK_CFG_VALUE | (PADS_REFCLK_CFG_VALUE << 16);
+	pads_writel(pcie, value, PADS_REFCLK_CFG0);
+
+	if (soc->num_ports > 2)
+		pads_writel(pcie, PADS_REFCLK_CFG_VALUE, PADS_REFCLK_CFG1);
+
+	/* wait for the PLL to lock */
+	err = tegra_pcie_pll_wait(pcie, 500);
+	if (err < 0) {
+		error("PLL failed to lock: %d", err);
+		return err;
+	}
+
+	/* turn off IDDQ override */
+	value = pads_readl(pcie, PADS_CTL);
+	value &= ~PADS_CTL_IDDQ_1L;
+	pads_writel(pcie, value, PADS_CTL);
+
+	/* enable TX/RX data */
+	value = pads_readl(pcie, PADS_CTL);
+	value |= PADS_CTL_TX_DATA_EN_1L | PADS_CTL_RX_DATA_EN_1L;
+	pads_writel(pcie, value, PADS_CTL);
+
+	return 0;
+}
+
+static int tegra_pcie_enable_controller(struct tegra_pcie *pcie)
+{
+	const struct tegra_pcie_soc *soc = pcie->soc;
+	struct tegra_pcie_port *port;
+	u32 value;
+	int err;
+
+	if (pcie->phy) {
+		value = afi_readl(pcie, AFI_PLLE_CONTROL);
+		value &= ~AFI_PLLE_CONTROL_BYPASS_PADS2PLLE_CONTROL;
+		value |= AFI_PLLE_CONTROL_PADS2PLLE_CONTROL_EN;
+		afi_writel(pcie, value, AFI_PLLE_CONTROL);
+	}
+
+	if (soc->has_pex_bias_ctrl)
+		afi_writel(pcie, 0, AFI_PEXBIAS_CTRL_0);
+
+	value = afi_readl(pcie, AFI_PCIE_CONFIG);
+	value &= ~AFI_PCIE_CONFIG_SM2TMS0_XBAR_CONFIG_MASK;
+	value |= AFI_PCIE_CONFIG_PCIE_DISABLE_ALL | pcie->xbar;
+
+	list_for_each_entry(port, &pcie->ports, list)
+		value &= ~AFI_PCIE_CONFIG_PCIE_DISABLE(port->index);
+
+	afi_writel(pcie, value, AFI_PCIE_CONFIG);
+
+	value = afi_readl(pcie, AFI_FUSE);
+
+	if (soc->has_gen2)
+		value &= ~AFI_FUSE_PCIE_T0_GEN2_DIS;
+	else
+		value |= AFI_FUSE_PCIE_T0_GEN2_DIS;
+
+	afi_writel(pcie, value, AFI_FUSE);
+
+	if (pcie->phy)
+		err = tegra_xusb_phy_enable(pcie->phy);
+	else
+		err = tegra_pcie_phy_enable(pcie);
+
+	if (err < 0) {
+		error("failed to power on PHY: %d\n", err);
+		return err;
+	}
+
+	/* take the PCIEXCLK logic out of reset */
+	reset_set_enable(PERIPH_ID_PCIEXCLK, 0);
+
+	/* finally enable PCIe */
+	value = afi_readl(pcie, AFI_CONFIGURATION);
+	value |= AFI_CONFIGURATION_EN_FPCI;
+	afi_writel(pcie, value, AFI_CONFIGURATION);
+
+	/* disable all interrupts */
+	afi_writel(pcie, 0, AFI_AFI_INTR_ENABLE);
+	afi_writel(pcie, 0, AFI_SM_INTR_ENABLE);
+	afi_writel(pcie, 0, AFI_INTR_MASK);
+	afi_writel(pcie, 0, AFI_FPCI_ERROR_MASKS);
+
+	return 0;
+}
+
+static void tegra_pcie_setup_translations(struct tegra_pcie *pcie)
+{
+	unsigned long fpci, axi, size;
+
+	/* BAR 0: type 1 extended configuration space */
+	fpci = 0xfe100000;
+	size = fdt_resource_size(&pcie->cs);
+	axi = pcie->cs.start;
+
+	afi_writel(pcie, axi, AFI_AXI_BAR0_START);
+	afi_writel(pcie, size >> 12, AFI_AXI_BAR0_SZ);
+	afi_writel(pcie, fpci, AFI_FPCI_BAR0);
+
+	/* BAR 1: downstream I/O */
+	fpci = 0xfdfc0000;
+	size = fdt_resource_size(&pcie->io);
+	axi = pcie->io.start;
+
+	afi_writel(pcie, axi, AFI_AXI_BAR1_START);
+	afi_writel(pcie, size >> 12, AFI_AXI_BAR1_SZ);
+	afi_writel(pcie, fpci, AFI_FPCI_BAR1);
+
+	/* BAR 2: prefetchable memory */
+	fpci = (((pcie->prefetch.start >> 12) & 0x0fffffff) << 4) | 0x1;
+	size = fdt_resource_size(&pcie->prefetch);
+	axi = pcie->prefetch.start;
+
+	afi_writel(pcie, axi, AFI_AXI_BAR2_START);
+	afi_writel(pcie, size >> 12, AFI_AXI_BAR2_SZ);
+	afi_writel(pcie, fpci, AFI_FPCI_BAR2);
+
+	/* BAR 3: non-prefetchable memory */
+	fpci = (((pcie->mem.start >> 12) & 0x0fffffff) << 4) | 0x1;
+	size = fdt_resource_size(&pcie->mem);
+	axi = pcie->mem.start;
+
+	afi_writel(pcie, axi, AFI_AXI_BAR3_START);
+	afi_writel(pcie, size >> 12, AFI_AXI_BAR3_SZ);
+	afi_writel(pcie, fpci, AFI_FPCI_BAR3);
+
+	/* NULL out the remaining BARs as they are not used */
+	afi_writel(pcie, 0, AFI_AXI_BAR4_START);
+	afi_writel(pcie, 0, AFI_AXI_BAR4_SZ);
+	afi_writel(pcie, 0, AFI_FPCI_BAR4);
+
+	afi_writel(pcie, 0, AFI_AXI_BAR5_START);
+	afi_writel(pcie, 0, AFI_AXI_BAR5_SZ);
+	afi_writel(pcie, 0, AFI_FPCI_BAR5);
+
+	/* map all upstream transactions as uncached */
+	afi_writel(pcie, NV_PA_SDRAM_BASE, AFI_CACHE_BAR0_ST);
+	afi_writel(pcie, 0, AFI_CACHE_BAR0_SZ);
+	afi_writel(pcie, 0, AFI_CACHE_BAR1_ST);
+	afi_writel(pcie, 0, AFI_CACHE_BAR1_SZ);
+
+	/* MSI translations are setup only when needed */
+	afi_writel(pcie, 0, AFI_MSI_FPCI_BAR_ST);
+	afi_writel(pcie, 0, AFI_MSI_BAR_SZ);
+	afi_writel(pcie, 0, AFI_MSI_AXI_BAR_ST);
+	afi_writel(pcie, 0, AFI_MSI_BAR_SZ);
+}
+
+static unsigned long tegra_pcie_port_get_pex_ctrl(struct tegra_pcie_port *port)
+{
+	unsigned long ret = 0;
+
+	switch (port->index) {
+	case 0:
+		ret = AFI_PEX0_CTRL;
+		break;
+
+	case 1:
+		ret = AFI_PEX1_CTRL;
+		break;
+
+	case 2:
+		ret = AFI_PEX2_CTRL;
+		break;
+	}
+
+	return ret;
+}
+
+static void tegra_pcie_port_reset(struct tegra_pcie_port *port)
+{
+	unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
+	unsigned long value;
+
+	/* pulse reset signel */
+	value = afi_readl(port->pcie, ctrl);
+	value &= ~AFI_PEX_CTRL_RST;
+	afi_writel(port->pcie, value, ctrl);
+
+	udelay(2000);
+
+	value = afi_readl(port->pcie, ctrl);
+	value |= AFI_PEX_CTRL_RST;
+	afi_writel(port->pcie, value, ctrl);
+}
+
+static void tegra_pcie_port_enable(struct tegra_pcie_port *port)
+{
+	unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
+	unsigned long value;
+
+	/* enable reference clock */
+	value = afi_readl(port->pcie, ctrl);
+	value |= AFI_PEX_CTRL_REFCLK_EN;
+
+	if (port->pcie->soc->has_pex_clkreq_en)
+		value |= AFI_PEX_CTRL_CLKREQ_EN;
+
+	value |= AFI_PEX_CTRL_OVERRIDE_EN;
+
+	afi_writel(port->pcie, value, ctrl);
+
+	tegra_pcie_port_reset(port);
+}
+
+static bool tegra_pcie_port_check_link(struct tegra_pcie_port *port)
+{
+	unsigned int retries = 3;
+	unsigned long value;
+
+	value = rp_readl(port, RP_PRIV_MISC);
+	value &= ~RP_PRIV_MISC_PRSNT_MAP_EP_ABSNT;
+	value |= RP_PRIV_MISC_PRSNT_MAP_EP_PRSNT;
+	rp_writel(port, value, RP_PRIV_MISC);
+
+	do {
+		unsigned int timeout = 200;
+
+		do {
+			value = rp_readl(port, RP_VEND_XP);
+			if (value & RP_VEND_XP_DL_UP)
+				break;
+
+			udelay(2000);
+		} while (--timeout);
+
+		if (!timeout) {
+			debug("link %u down, retrying\n", port->index);
+			goto retry;
+		}
+
+		timeout = 200;
+
+		do {
+			value = rp_readl(port, RP_LINK_CONTROL_STATUS);
+			if (value & RP_LINK_CONTROL_STATUS_DL_LINK_ACTIVE)
+				return true;
+
+			udelay(2000);
+		} while (--timeout);
+
+retry:
+		tegra_pcie_port_reset(port);
+	} while (--retries);
+
+	return false;
+}
+
+static void tegra_pcie_port_disable(struct tegra_pcie_port *port)
+{
+	unsigned long ctrl = tegra_pcie_port_get_pex_ctrl(port);
+	unsigned long value;
+
+	/* assert port reset */
+	value = afi_readl(port->pcie, ctrl);
+	value &= ~AFI_PEX_CTRL_RST;
+	afi_writel(port->pcie, value, ctrl);
+
+	/* disable reference clock */
+	value = afi_readl(port->pcie, ctrl);
+	value &= ~AFI_PEX_CTRL_REFCLK_EN;
+	afi_writel(port->pcie, value, ctrl);
+}
+
+static void tegra_pcie_port_free(struct tegra_pcie_port *port)
+{
+	list_del(&port->list);
+	free(port);
+}
+
+static int tegra_pcie_enable(struct tegra_pcie *pcie)
+{
+	struct tegra_pcie_port *port, *tmp;
+
+	list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
+		debug("probing port %u, using %u lanes\n", port->index,
+		      port->num_lanes);
+
+		tegra_pcie_port_enable(port);
+
+		if (tegra_pcie_port_check_link(port))
+			continue;
+
+		debug("link %u down, ignoring\n", port->index);
+
+		tegra_pcie_port_disable(port);
+		tegra_pcie_port_free(port);
+	}
+
+	return 0;
+}
+
+static const struct tegra_pcie_soc tegra20_pcie_soc = {
+	.num_ports = 2,
+	.pads_pll_ctl = PADS_PLL_CTL_TEGRA20,
+	.tx_ref_sel = PADS_PLL_CTL_TXCLKREF_DIV10,
+	.has_pex_clkreq_en = false,
+	.has_pex_bias_ctrl = false,
+	.has_cml_clk = false,
+	.has_gen2 = false,
+};
+
+static const struct tegra_pcie_soc tegra30_pcie_soc = {
+	.num_ports = 3,
+	.pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
+	.tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
+	.has_pex_clkreq_en = true,
+	.has_pex_bias_ctrl = true,
+	.has_cml_clk = true,
+	.has_gen2 = false,
+};
+
+static const struct tegra_pcie_soc tegra124_pcie_soc = {
+	.num_ports = 2,
+	.pads_pll_ctl = PADS_PLL_CTL_TEGRA30,
+	.tx_ref_sel = PADS_PLL_CTL_TXCLKREF_BUF_EN,
+	.has_pex_clkreq_en = true,
+	.has_pex_bias_ctrl = true,
+	.has_cml_clk = true,
+	.has_gen2 = true,
+};
+
+static int process_nodes(const void *fdt, int nodes[], unsigned int count)
+{
+	unsigned int i;
+
+	for (i = 0; i < count; i++) {
+		const struct tegra_pcie_soc *soc;
+		struct tegra_pcie *pcie;
+		enum fdt_compat_id id;
+		int err;
+
+		if (!fdtdec_get_is_enabled(fdt, nodes[i]))
+			continue;
+
+		id = fdtdec_lookup(fdt, nodes[i]);
+		switch (id) {
+		case COMPAT_NVIDIA_TEGRA20_PCIE:
+			soc = &tegra20_pcie_soc;
+			break;
+
+		case COMPAT_NVIDIA_TEGRA30_PCIE:
+			soc = &tegra30_pcie_soc;
+			break;
+
+		case COMPAT_NVIDIA_TEGRA124_PCIE:
+			soc = &tegra124_pcie_soc;
+			break;
+
+		default:
+			error("unsupported compatible: %s",
+			      fdtdec_get_compatible(id));
+			continue;
+		}
+
+		pcie = malloc(sizeof(*pcie));
+		if (!pcie) {
+			error("failed to allocate controller");
+			continue;
+		}
+
+		memset(pcie, 0, sizeof(*pcie));
+		pcie->soc = soc;
+
+		INIT_LIST_HEAD(&pcie->ports);
+
+		err = tegra_pcie_parse_dt(fdt, nodes[i], pcie);
+		if (err < 0) {
+			free(pcie);
+			continue;
+		}
+
+		err = tegra_pcie_power_on(pcie);
+		if (err < 0) {
+			error("failed to power on");
+			continue;
+		}
+
+		err = tegra_pcie_enable_controller(pcie);
+		if (err < 0) {
+			error("failed to enable controller");
+			continue;
+		}
+
+		tegra_pcie_setup_translations(pcie);
+
+		err = tegra_pcie_enable(pcie);
+		if (err < 0) {
+			error("failed to enable PCIe");
+			continue;
+		}
+
+		pcie->hose.first_busno = 0;
+		pcie->hose.current_busno = 0;
+		pcie->hose.last_busno = 0;
+
+		pci_set_region(&pcie->hose.regions[0], NV_PA_SDRAM_BASE,
+			       NV_PA_SDRAM_BASE, gd->ram_size,
+			       PCI_REGION_MEM | PCI_REGION_SYS_MEMORY);
+
+		pci_set_region(&pcie->hose.regions[1], pcie->io.start,
+			       pcie->io.start, fdt_resource_size(&pcie->io),
+			       PCI_REGION_IO);
+
+		pci_set_region(&pcie->hose.regions[2], pcie->mem.start,
+			       pcie->mem.start, fdt_resource_size(&pcie->mem),
+			       PCI_REGION_MEM);
+
+		pci_set_region(&pcie->hose.regions[3], pcie->prefetch.start,
+			       pcie->prefetch.start,
+			       fdt_resource_size(&pcie->prefetch),
+			       PCI_REGION_MEM | PCI_REGION_PREFETCH);
+
+		pcie->hose.region_count = 4;
+
+		pci_set_ops(&pcie->hose,
+			    pci_hose_read_config_byte_via_dword,
+			    pci_hose_read_config_word_via_dword,
+			    tegra_pcie_read_conf,
+			    pci_hose_write_config_byte_via_dword,
+			    pci_hose_write_config_word_via_dword,
+			    tegra_pcie_write_conf);
+
+		pci_register_hose(&pcie->hose);
+
+#ifdef CONFIG_PCI_SCAN_SHOW
+		printf("PCI: Enumerating devices...\n");
+		printf("---------------------------------------\n");
+		printf("  Device        ID          Description\n");
+		printf("  ------        --          -----------\n");
+#endif
+
+		pcie->hose.last_busno = pci_hose_scan(&pcie->hose);
+	}
+
+	return 0;
+}
+
+void pci_init_board(void)
+{
+	const void *fdt = gd->fdt_blob;
+	int count, nodes[1];
+
+	count = fdtdec_find_aliases_for_id(fdt, "pcie-controller",
+					   COMPAT_NVIDIA_TEGRA124_PCIE,
+					   nodes, ARRAY_SIZE(nodes));
+	if (process_nodes(fdt, nodes, count))
+		return;
+
+	count = fdtdec_find_aliases_for_id(fdt, "pcie-controller",
+					   COMPAT_NVIDIA_TEGRA30_PCIE,
+					   nodes, ARRAY_SIZE(nodes));
+	if (process_nodes(fdt, nodes, count))
+		return;
+
+	count = fdtdec_find_aliases_for_id(fdt, "pcie-controller",
+					   COMPAT_NVIDIA_TEGRA20_PCIE,
+					   nodes, ARRAY_SIZE(nodes));
+	if (process_nodes(fdt, nodes, count))
+		return;
+}
+
+int pci_skip_dev(struct pci_controller *hose, pci_dev_t dev)
+{
+	if (PCI_BUS(dev) != 0 && PCI_DEV(dev) > 0)
+		return 1;
+
+	return 0;
+}