Merge tag 'drivers-for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc

Pull ARM SoC driver changes from Olof Johansson:
 "A handful of driver-related changes.  We've had a bunch of them going
  in through other branches as well, so it's only a part of what we
  really have this release.

  Larger pieces are:

   - Removal of a now unused PWM driver for atmel
     [ This includes AVR32 changes that have been appropriately acked ]
   - Performance counter support for the arm CCN interconnect
   - OMAP mailbox driver cleanups and consolidation
   - PCI and SATA PHY drivers for SPEAr 13xx platforms
   - Redefinition (with backwards compatibility!) of PCI DT bindings for
     Tegra to better model regulators/power"

Note: this merge also fixes up the semantic conflict with the new
calling convention for devm_phy_create(), see commit f0ed817638b5 ("phy:
core: Let node ptr of PHY point to PHY and not of PHY provider") that
came in through Greg's USB tree.

Semantic merge patch by Stephen Rothwell <sfr@canb.auug.org.au> through
the next tree.

* tag 'drivers-for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (38 commits)
  bus: arm-ccn: Fix error handling at event allocation
  mailbox/omap: add a parent structure for every IP instance
  mailbox/omap: remove the private mailbox structure
  mailbox/omap: consolidate OMAP mailbox driver
  mailbox/omap: simplify the fifo assignment by using macros
  mailbox/omap: remove omap_mbox_type_t from mailbox ops
  mailbox/omap: remove OMAP1 mailbox driver
  mailbox/omap: use devm_* interfaces
  bus: ARM CCN: add PERF_EVENTS dependency
  bus: ARM CCN PMU driver
  PCI: spear: Remove spear13xx_pcie_remove()
  PCI: spear: Fix Section mismatch compilation warning for probe()
  ARM: tegra: Remove legacy PCIe power supply properties
  PCI: tegra: Remove deprecated power supply properties
  PCI: tegra: Implement accurate power supply scheme
  ARM: SPEAr13xx: Update defconfigs
  ARM: SPEAr13xx: Add pcie and miphy DT nodes
  ARM: SPEAr13xx: Add bindings and dt node for misc block
  ARM: SPEAr13xx: Fix static mapping table
  phy: Add drivers for PCIe and SATA phy on SPEAr13xx
  ...

4 files changed, 563 insertions, 61 deletions

diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index 21df477..2d8a4d0 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -46,4 +46,12 @@ config PCI_HOST_GENERIC
 	  Say Y here if you want to support a simple generic PCI host
 	  controller, such as the one emulated by kvmtool.
 
+config PCIE_SPEAR13XX
+	tristate "STMicroelectronics SPEAr PCIe controller"
+	depends on ARCH_SPEAR13XX
+	select PCIEPORTBUS
+	select PCIE_DW
+	help
+	  Say Y here if you want PCIe support on SPEAr13XX SoCs.
+
 endmenu
diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index 611ba4b..0daec79 100644
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -6,3 +6,4 @@ obj-$(CONFIG_PCI_TEGRA) += pci-tegra.o
 obj-$(CONFIG_PCI_RCAR_GEN2) += pci-rcar-gen2.o
 obj-$(CONFIG_PCI_RCAR_GEN2_PCIE) += pcie-rcar.o
 obj-$(CONFIG_PCI_HOST_GENERIC) += pci-host-generic.o
+obj-$(CONFIG_PCIE_SPEAR13XX) += pcie-spear13xx.o
diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
index 60a7299..abd6578 100644
--- a/drivers/pci/host/pci-tegra.c
+++ b/drivers/pci/host/pci-tegra.c
@@ -234,7 +234,6 @@ struct tegra_pcie_soc_data {
 	bool has_pex_clkreq_en;
 	bool has_pex_bias_ctrl;
 	bool has_intr_prsnt_sense;
-	bool has_avdd_supply;
 	bool has_cml_clk;
 };
 
@@ -273,9 +272,8 @@ struct tegra_pcie {
 	unsigned int num_ports;
 	u32 xbar_config;
 
-	struct regulator *pex_clk_supply;
-	struct regulator *vdd_supply;
-	struct regulator *avdd_supply;
+	struct regulator_bulk_data *supplies;
+	unsigned int num_supplies;
 
 	const struct tegra_pcie_soc_data *soc_data;
 };
@@ -895,7 +893,6 @@ static int tegra_pcie_enable_controller(struct tegra_pcie *pcie)
 
 static void tegra_pcie_power_off(struct tegra_pcie *pcie)
 {
-	const struct tegra_pcie_soc_data *soc = pcie->soc_data;
 	int err;
 
 	/* TODO: disable and unprepare clocks? */
@@ -906,23 +903,9 @@ static void tegra_pcie_power_off(struct tegra_pcie *pcie)
 
 	tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
 
-	if (soc->has_avdd_supply) {
-		err = regulator_disable(pcie->avdd_supply);
-		if (err < 0)
-			dev_warn(pcie->dev,
-				 "failed to disable AVDD regulator: %d\n",
-				 err);
-	}
-
-	err = regulator_disable(pcie->pex_clk_supply);
+	err = regulator_bulk_disable(pcie->num_supplies, pcie->supplies);
 	if (err < 0)
-		dev_warn(pcie->dev, "failed to disable pex-clk regulator: %d\n",
-			 err);
-
-	err = regulator_disable(pcie->vdd_supply);
-	if (err < 0)
-		dev_warn(pcie->dev, "failed to disable VDD regulator: %d\n",
-			 err);
+		dev_warn(pcie->dev, "failed to disable regulators: %d\n", err);
 }
 
 static int tegra_pcie_power_on(struct tegra_pcie *pcie)
@@ -937,28 +920,9 @@ static int tegra_pcie_power_on(struct tegra_pcie *pcie)
 	tegra_powergate_power_off(TEGRA_POWERGATE_PCIE);
 
 	/* enable regulators */
-	err = regulator_enable(pcie->vdd_supply);
-	if (err < 0) {
-		dev_err(pcie->dev, "failed to enable VDD regulator: %d\n", err);
-		return err;
-	}
-
-	err = regulator_enable(pcie->pex_clk_supply);
-	if (err < 0) {
-		dev_err(pcie->dev, "failed to enable pex-clk regulator: %d\n",
-			err);
-		return err;
-	}
-
-	if (soc->has_avdd_supply) {
-		err = regulator_enable(pcie->avdd_supply);
-		if (err < 0) {
-			dev_err(pcie->dev,
-				"failed to enable AVDD regulator: %d\n",
-				err);
-			return err;
-		}
-	}
+	err = regulator_bulk_enable(pcie->num_supplies, pcie->supplies);
+	if (err < 0)
+		dev_err(pcie->dev, "failed to enable regulators: %d\n", err);
 
 	err = tegra_powergate_sequence_power_up(TEGRA_POWERGATE_PCIE,
 						pcie->pex_clk,
@@ -1395,14 +1359,157 @@ static int tegra_pcie_get_xbar_config(struct tegra_pcie *pcie, u32 lanes,
 	return -EINVAL;
 }
 
+/*
+ * Check whether a given set of supplies is available in a device tree node.
+ * This is used to check whether the new or the legacy device tree bindings
+ * should be used.
+ */
+static bool of_regulator_bulk_available(struct device_node *np,
+					struct regulator_bulk_data *supplies,
+					unsigned int num_supplies)
+{
+	char property[32];
+	unsigned int i;
+
+	for (i = 0; i < num_supplies; i++) {
+		snprintf(property, 32, "%s-supply", supplies[i].supply);
+
+		if (of_find_property(np, property, NULL) == NULL)
+			return false;
+	}
+
+	return true;
+}
+
+/*
+ * Old versions of the device tree binding for this device used a set of power
+ * supplies that didn't match the hardware inputs. This happened to work for a
+ * number of cases but is not future proof. However to preserve backwards-
+ * compatibility with old device trees, this function will try to use the old
+ * set of supplies.
+ */
+static int tegra_pcie_get_legacy_regulators(struct tegra_pcie *pcie)
+{
+	struct device_node *np = pcie->dev->of_node;
+
+	if (of_device_is_compatible(np, "nvidia,tegra30-pcie"))
+		pcie->num_supplies = 3;
+	else if (of_device_is_compatible(np, "nvidia,tegra20-pcie"))
+		pcie->num_supplies = 2;
+
+	if (pcie->num_supplies == 0) {
+		dev_err(pcie->dev, "device %s not supported in legacy mode\n",
+			np->full_name);
+		return -ENODEV;
+	}
+
+	pcie->supplies = devm_kcalloc(pcie->dev, pcie->num_supplies,
+				      sizeof(*pcie->supplies),
+				      GFP_KERNEL);
+	if (!pcie->supplies)
+		return -ENOMEM;
+
+	pcie->supplies[0].supply = "pex-clk";
+	pcie->supplies[1].supply = "vdd";
+
+	if (pcie->num_supplies > 2)
+		pcie->supplies[2].supply = "avdd";
+
+	return devm_regulator_bulk_get(pcie->dev, pcie->num_supplies,
+				       pcie->supplies);
+}
+
+/*
+ * Obtains the list of regulators required for a particular generation of the
+ * IP block.
+ *
+ * This would've been nice to do simply by providing static tables for use
+ * with the regulator_bulk_*() API, but unfortunately Tegra30 is a bit quirky
+ * in that it has two pairs or AVDD_PEX and VDD_PEX supplies (PEXA and PEXB)
+ * and either seems to be optional depending on which ports are being used.
+ */
+static int tegra_pcie_get_regulators(struct tegra_pcie *pcie, u32 lane_mask)
+{
+	struct device_node *np = pcie->dev->of_node;
+	unsigned int i = 0;
+
+	if (of_device_is_compatible(np, "nvidia,tegra30-pcie")) {
+		bool need_pexa = false, need_pexb = false;
+
+		/* VDD_PEXA and AVDD_PEXA supply lanes 0 to 3 */
+		if (lane_mask & 0x0f)
+			need_pexa = true;
+
+		/* VDD_PEXB and AVDD_PEXB supply lanes 4 to 5 */
+		if (lane_mask & 0x30)
+			need_pexb = true;
+
+		pcie->num_supplies = 4 + (need_pexa ? 2 : 0) +
+					 (need_pexb ? 2 : 0);
+
+		pcie->supplies = devm_kcalloc(pcie->dev, pcie->num_supplies,
+					      sizeof(*pcie->supplies),
+					      GFP_KERNEL);
+		if (!pcie->supplies)
+			return -ENOMEM;
+
+		pcie->supplies[i++].supply = "avdd-pex-pll";
+		pcie->supplies[i++].supply = "hvdd-pex";
+		pcie->supplies[i++].supply = "vddio-pex-ctl";
+		pcie->supplies[i++].supply = "avdd-plle";
+
+		if (need_pexa) {
+			pcie->supplies[i++].supply = "avdd-pexa";
+			pcie->supplies[i++].supply = "vdd-pexa";
+		}
+
+		if (need_pexb) {
+			pcie->supplies[i++].supply = "avdd-pexb";
+			pcie->supplies[i++].supply = "vdd-pexb";
+		}
+	} else if (of_device_is_compatible(np, "nvidia,tegra20-pcie")) {
+		pcie->num_supplies = 5;
+
+		pcie->supplies = devm_kcalloc(pcie->dev, pcie->num_supplies,
+					      sizeof(*pcie->supplies),
+					      GFP_KERNEL);
+		if (!pcie->supplies)
+			return -ENOMEM;
+
+		pcie->supplies[0].supply = "avdd-pex";
+		pcie->supplies[1].supply = "vdd-pex";
+		pcie->supplies[2].supply = "avdd-pex-pll";
+		pcie->supplies[3].supply = "avdd-plle";
+		pcie->supplies[4].supply = "vddio-pex-clk";
+	}
+
+	if (of_regulator_bulk_available(pcie->dev->of_node, pcie->supplies,
+					pcie->num_supplies))
+		return devm_regulator_bulk_get(pcie->dev, pcie->num_supplies,
+					       pcie->supplies);
+
+	/*
+	 * If not all regulators are available for this new scheme, assume
+	 * that the device tree complies with an older version of the device
+	 * tree binding.
+	 */
+	dev_info(pcie->dev, "using legacy DT binding for power supplies\n");
+
+	devm_kfree(pcie->dev, pcie->supplies);
+	pcie->num_supplies = 0;
+
+	return tegra_pcie_get_legacy_regulators(pcie);
+}
+
 static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
 {
 	const struct tegra_pcie_soc_data *soc = pcie->soc_data;
 	struct device_node *np = pcie->dev->of_node, *port;
 	struct of_pci_range_parser parser;
 	struct of_pci_range range;
+	u32 lanes = 0, mask = 0;
+	unsigned int lane = 0;
 	struct resource res;
-	u32 lanes = 0;
 	int err;
 
 	if (of_pci_range_parser_init(&parser, np)) {
@@ -1410,20 +1517,6 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
 		return -EINVAL;
 	}
 
-	pcie->vdd_supply = devm_regulator_get(pcie->dev, "vdd");
-	if (IS_ERR(pcie->vdd_supply))
-		return PTR_ERR(pcie->vdd_supply);
-
-	pcie->pex_clk_supply = devm_regulator_get(pcie->dev, "pex-clk");
-	if (IS_ERR(pcie->pex_clk_supply))
-		return PTR_ERR(pcie->pex_clk_supply);
-
-	if (soc->has_avdd_supply) {
-		pcie->avdd_supply = devm_regulator_get(pcie->dev, "avdd");
-		if (IS_ERR(pcie->avdd_supply))
-			return PTR_ERR(pcie->avdd_supply);
-	}
-
 	for_each_of_pci_range(&parser, &range) {
 		of_pci_range_to_resource(&range, np, &res);
 
@@ -1491,8 +1584,13 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
 
 		lanes |= value << (index << 3);
 
-		if (!of_device_is_available(port))
+		if (!of_device_is_available(port)) {
+			lane += value;
 			continue;
+		}
+
+		mask |= ((1 << value) - 1) << lane;
+		lane += value;
 
 		rp = devm_kzalloc(pcie->dev, sizeof(*rp), GFP_KERNEL);
 		if (!rp)
@@ -1523,6 +1621,10 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
 		return err;
 	}
 
+	err = tegra_pcie_get_regulators(pcie, mask);
+	if (err < 0)
+		return err;
+
 	return 0;
 }
 
@@ -1616,7 +1718,6 @@ static const struct tegra_pcie_soc_data tegra20_pcie_data = {
 	.has_pex_clkreq_en = false,
 	.has_pex_bias_ctrl = false,
 	.has_intr_prsnt_sense = false,
-	.has_avdd_supply = false,
 	.has_cml_clk = false,
 };
 
@@ -1628,7 +1729,6 @@ static const struct tegra_pcie_soc_data tegra30_pcie_data = {
 	.has_pex_clkreq_en = true,
 	.has_pex_bias_ctrl = true,
 	.has_intr_prsnt_sense = true,
-	.has_avdd_supply = true,
 	.has_cml_clk = true,
 };
 
diff --git a/drivers/pci/host/pcie-spear13xx.c b/drivers/pci/host/pcie-spear13xx.c
new file mode 100644
index 0000000..6dea9e4
--- /dev/null
+++ b/drivers/pci/host/pcie-spear13xx.c
@@ -0,0 +1,393 @@
+/*
+ * PCIe host controller driver for ST Microelectronics SPEAr13xx SoCs
+ *
+ * SPEAr13xx PCIe Glue Layer Source Code
+ *
+ * Copyright (C) 2010-2014 ST Microelectronics
+ * Pratyush Anand <pratyush.anand@st.com>
+ * Mohit Kumar <mohit.kumar@st.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pci.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/resource.h>
+
+#include "pcie-designware.h"
+
+struct spear13xx_pcie {
+	void __iomem		*app_base;
+	struct phy		*phy;
+	struct clk		*clk;
+	struct pcie_port	pp;
+	bool			is_gen1;
+};
+
+struct pcie_app_reg {
+	u32	app_ctrl_0;		/* cr0 */
+	u32	app_ctrl_1;		/* cr1 */
+	u32	app_status_0;		/* cr2 */
+	u32	app_status_1;		/* cr3 */
+	u32	msg_status;		/* cr4 */
+	u32	msg_payload;		/* cr5 */
+	u32	int_sts;		/* cr6 */
+	u32	int_clr;		/* cr7 */
+	u32	int_mask;		/* cr8 */
+	u32	mst_bmisc;		/* cr9 */
+	u32	phy_ctrl;		/* cr10 */
+	u32	phy_status;		/* cr11 */
+	u32	cxpl_debug_info_0;	/* cr12 */
+	u32	cxpl_debug_info_1;	/* cr13 */
+	u32	ven_msg_ctrl_0;		/* cr14 */
+	u32	ven_msg_ctrl_1;		/* cr15 */
+	u32	ven_msg_data_0;		/* cr16 */
+	u32	ven_msg_data_1;		/* cr17 */
+	u32	ven_msi_0;		/* cr18 */
+	u32	ven_msi_1;		/* cr19 */
+	u32	mst_rmisc;		/* cr20 */
+};
+
+/* CR0 ID */
+#define RX_LANE_FLIP_EN_ID			0
+#define TX_LANE_FLIP_EN_ID			1
+#define SYS_AUX_PWR_DET_ID			2
+#define APP_LTSSM_ENABLE_ID			3
+#define SYS_ATTEN_BUTTON_PRESSED_ID		4
+#define SYS_MRL_SENSOR_STATE_ID			5
+#define SYS_PWR_FAULT_DET_ID			6
+#define SYS_MRL_SENSOR_CHGED_ID			7
+#define SYS_PRE_DET_CHGED_ID			8
+#define SYS_CMD_CPLED_INT_ID			9
+#define APP_INIT_RST_0_ID			11
+#define APP_REQ_ENTR_L1_ID			12
+#define APP_READY_ENTR_L23_ID			13
+#define APP_REQ_EXIT_L1_ID			14
+#define DEVICE_TYPE_EP				(0 << 25)
+#define DEVICE_TYPE_LEP				(1 << 25)
+#define DEVICE_TYPE_RC				(4 << 25)
+#define SYS_INT_ID				29
+#define MISCTRL_EN_ID				30
+#define REG_TRANSLATION_ENABLE			31
+
+/* CR1 ID */
+#define APPS_PM_XMT_TURNOFF_ID			2
+#define APPS_PM_XMT_PME_ID			5
+
+/* CR3 ID */
+#define XMLH_LTSSM_STATE_DETECT_QUIET		0x00
+#define XMLH_LTSSM_STATE_DETECT_ACT		0x01
+#define XMLH_LTSSM_STATE_POLL_ACTIVE		0x02
+#define XMLH_LTSSM_STATE_POLL_COMPLIANCE	0x03
+#define XMLH_LTSSM_STATE_POLL_CONFIG		0x04
+#define XMLH_LTSSM_STATE_PRE_DETECT_QUIET	0x05
+#define XMLH_LTSSM_STATE_DETECT_WAIT		0x06
+#define XMLH_LTSSM_STATE_CFG_LINKWD_START	0x07
+#define XMLH_LTSSM_STATE_CFG_LINKWD_ACEPT	0x08
+#define XMLH_LTSSM_STATE_CFG_LANENUM_WAIT	0x09
+#define XMLH_LTSSM_STATE_CFG_LANENUM_ACEPT	0x0A
+#define XMLH_LTSSM_STATE_CFG_COMPLETE		0x0B
+#define XMLH_LTSSM_STATE_CFG_IDLE		0x0C
+#define XMLH_LTSSM_STATE_RCVRY_LOCK		0x0D
+#define XMLH_LTSSM_STATE_RCVRY_SPEED		0x0E
+#define XMLH_LTSSM_STATE_RCVRY_RCVRCFG		0x0F
+#define XMLH_LTSSM_STATE_RCVRY_IDLE		0x10
+#define XMLH_LTSSM_STATE_L0			0x11
+#define XMLH_LTSSM_STATE_L0S			0x12
+#define XMLH_LTSSM_STATE_L123_SEND_EIDLE	0x13
+#define XMLH_LTSSM_STATE_L1_IDLE		0x14
+#define XMLH_LTSSM_STATE_L2_IDLE		0x15
+#define XMLH_LTSSM_STATE_L2_WAKE		0x16
+#define XMLH_LTSSM_STATE_DISABLED_ENTRY		0x17
+#define XMLH_LTSSM_STATE_DISABLED_IDLE		0x18
+#define XMLH_LTSSM_STATE_DISABLED		0x19
+#define XMLH_LTSSM_STATE_LPBK_ENTRY		0x1A
+#define XMLH_LTSSM_STATE_LPBK_ACTIVE		0x1B
+#define XMLH_LTSSM_STATE_LPBK_EXIT		0x1C
+#define XMLH_LTSSM_STATE_LPBK_EXIT_TIMEOUT	0x1D
+#define XMLH_LTSSM_STATE_HOT_RESET_ENTRY	0x1E
+#define XMLH_LTSSM_STATE_HOT_RESET		0x1F
+#define XMLH_LTSSM_STATE_MASK			0x3F
+#define XMLH_LINK_UP				(1 << 6)
+
+/* CR4 ID */
+#define CFG_MSI_EN_ID				18
+
+/* CR6 */
+#define INTA_CTRL_INT				(1 << 7)
+#define INTB_CTRL_INT				(1 << 8)
+#define INTC_CTRL_INT				(1 << 9)
+#define INTD_CTRL_INT				(1 << 10)
+#define MSI_CTRL_INT				(1 << 26)
+
+/* CR19 ID */
+#define VEN_MSI_REQ_ID				11
+#define VEN_MSI_FUN_NUM_ID			8
+#define VEN_MSI_TC_ID				5
+#define VEN_MSI_VECTOR_ID			0
+#define VEN_MSI_REQ_EN		((u32)0x1 << VEN_MSI_REQ_ID)
+#define VEN_MSI_FUN_NUM_MASK	((u32)0x7 << VEN_MSI_FUN_NUM_ID)
+#define VEN_MSI_TC_MASK		((u32)0x7 << VEN_MSI_TC_ID)
+#define VEN_MSI_VECTOR_MASK	((u32)0x1F << VEN_MSI_VECTOR_ID)
+
+#define EXP_CAP_ID_OFFSET			0x70
+
+#define to_spear13xx_pcie(x)	container_of(x, struct spear13xx_pcie, pp)
+
+static int spear13xx_pcie_establish_link(struct pcie_port *pp)
+{
+	u32 val;
+	int count = 0;
+	struct spear13xx_pcie *spear13xx_pcie = to_spear13xx_pcie(pp);
+	struct pcie_app_reg *app_reg = spear13xx_pcie->app_base;
+	u32 exp_cap_off = EXP_CAP_ID_OFFSET;
+
+	if (dw_pcie_link_up(pp)) {
+		dev_err(pp->dev, "link already up\n");
+		return 0;
+	}
+
+	dw_pcie_setup_rc(pp);
+
+	/*
+	 * this controller support only 128 bytes read size, however its
+	 * default value in capability register is 512 bytes. So force
+	 * it to 128 here.
+	 */
+	dw_pcie_cfg_read(pp->dbi_base, exp_cap_off + PCI_EXP_DEVCTL, 4, &val);
+	val &= ~PCI_EXP_DEVCTL_READRQ;
+	dw_pcie_cfg_write(pp->dbi_base, exp_cap_off + PCI_EXP_DEVCTL, 4, val);
+
+	dw_pcie_cfg_write(pp->dbi_base, PCI_VENDOR_ID, 2, 0x104A);
+	dw_pcie_cfg_write(pp->dbi_base, PCI_DEVICE_ID, 2, 0xCD80);
+
+	/*
+	 * if is_gen1 is set then handle it, so that some buggy card
+	 * also works
+	 */
+	if (spear13xx_pcie->is_gen1) {
+		dw_pcie_cfg_read(pp->dbi_base, exp_cap_off + PCI_EXP_LNKCAP, 4,
+				 &val);
+		if ((val & PCI_EXP_LNKCAP_SLS) != PCI_EXP_LNKCAP_SLS_2_5GB) {
+			val &= ~((u32)PCI_EXP_LNKCAP_SLS);
+			val |= PCI_EXP_LNKCAP_SLS_2_5GB;
+			dw_pcie_cfg_write(pp->dbi_base, exp_cap_off +
+					  PCI_EXP_LNKCAP, 4, val);
+		}
+
+		dw_pcie_cfg_read(pp->dbi_base, exp_cap_off + PCI_EXP_LNKCTL2, 4,
+				 &val);
+		if ((val & PCI_EXP_LNKCAP_SLS) != PCI_EXP_LNKCAP_SLS_2_5GB) {
+			val &= ~((u32)PCI_EXP_LNKCAP_SLS);
+			val |= PCI_EXP_LNKCAP_SLS_2_5GB;
+			dw_pcie_cfg_write(pp->dbi_base, exp_cap_off +
+					  PCI_EXP_LNKCTL2, 4, val);
+		}
+	}
+
+	/* enable ltssm */
+	writel(DEVICE_TYPE_RC | (1 << MISCTRL_EN_ID)
+			| (1 << APP_LTSSM_ENABLE_ID)
+			| ((u32)1 << REG_TRANSLATION_ENABLE),
+			&app_reg->app_ctrl_0);
+
+	/* check if the link is up or not */
+	while (!dw_pcie_link_up(pp)) {
+		mdelay(100);
+		count++;
+		if (count == 10) {
+			dev_err(pp->dev, "link Fail\n");
+			return -EINVAL;
+		}
+	}
+	dev_info(pp->dev, "link up\n");
+
+	return 0;
+}
+
+static irqreturn_t spear13xx_pcie_irq_handler(int irq, void *arg)
+{
+	struct pcie_port *pp = arg;
+	struct spear13xx_pcie *spear13xx_pcie = to_spear13xx_pcie(pp);
+	struct pcie_app_reg *app_reg = spear13xx_pcie->app_base;
+	unsigned int status;
+
+	status = readl(&app_reg->int_sts);
+
+	if (status & MSI_CTRL_INT) {
+		if (!IS_ENABLED(CONFIG_PCI_MSI))
+			BUG();
+		dw_handle_msi_irq(pp);
+	}
+
+	writel(status, &app_reg->int_clr);
+
+	return IRQ_HANDLED;
+}
+
+static void spear13xx_pcie_enable_interrupts(struct pcie_port *pp)
+{
+	struct spear13xx_pcie *spear13xx_pcie = to_spear13xx_pcie(pp);
+	struct pcie_app_reg *app_reg = spear13xx_pcie->app_base;
+
+	/* Enable MSI interrupt */
+	if (IS_ENABLED(CONFIG_PCI_MSI)) {
+		dw_pcie_msi_init(pp);
+		writel(readl(&app_reg->int_mask) |
+				MSI_CTRL_INT, &app_reg->int_mask);
+	}
+}
+
+static int spear13xx_pcie_link_up(struct pcie_port *pp)
+{
+	struct spear13xx_pcie *spear13xx_pcie = to_spear13xx_pcie(pp);
+	struct pcie_app_reg *app_reg = spear13xx_pcie->app_base;
+
+	if (readl(&app_reg->app_status_1) & XMLH_LINK_UP)
+		return 1;
+
+	return 0;
+}
+
+static void spear13xx_pcie_host_init(struct pcie_port *pp)
+{
+	spear13xx_pcie_establish_link(pp);
+	spear13xx_pcie_enable_interrupts(pp);
+}
+
+static struct pcie_host_ops spear13xx_pcie_host_ops = {
+	.link_up = spear13xx_pcie_link_up,
+	.host_init = spear13xx_pcie_host_init,
+};
+
+static int add_pcie_port(struct pcie_port *pp, struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	pp->irq = platform_get_irq(pdev, 0);
+	if (!pp->irq) {
+		dev_err(dev, "failed to get irq\n");
+		return -ENODEV;
+	}
+	ret = devm_request_irq(dev, pp->irq, spear13xx_pcie_irq_handler,
+			       IRQF_SHARED, "spear1340-pcie", pp);
+	if (ret) {
+		dev_err(dev, "failed to request irq %d\n", pp->irq);
+		return ret;
+	}
+
+	pp->root_bus_nr = -1;
+	pp->ops = &spear13xx_pcie_host_ops;
+
+	ret = dw_pcie_host_init(pp);
+	if (ret) {
+		dev_err(dev, "failed to initialize host\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int __init spear13xx_pcie_probe(struct platform_device *pdev)
+{
+	struct spear13xx_pcie *spear13xx_pcie;
+	struct pcie_port *pp;
+	struct device *dev = &pdev->dev;
+	struct device_node *np = pdev->dev.of_node;
+	struct resource *dbi_base;
+	int ret;
+
+	spear13xx_pcie = devm_kzalloc(dev, sizeof(*spear13xx_pcie), GFP_KERNEL);
+	if (!spear13xx_pcie) {
+		dev_err(dev, "no memory for SPEAr13xx pcie\n");
+		return -ENOMEM;
+	}
+
+	spear13xx_pcie->phy = devm_phy_get(dev, "pcie-phy");
+	if (IS_ERR(spear13xx_pcie->phy)) {
+		ret = PTR_ERR(spear13xx_pcie->phy);
+		if (ret == -EPROBE_DEFER)
+			dev_info(dev, "probe deferred\n");
+		else
+			dev_err(dev, "couldn't get pcie-phy\n");
+		return ret;
+	}
+
+	phy_init(spear13xx_pcie->phy);
+
+	spear13xx_pcie->clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(spear13xx_pcie->clk)) {
+		dev_err(dev, "couldn't get clk for pcie\n");
+		return PTR_ERR(spear13xx_pcie->clk);
+	}
+	ret = clk_prepare_enable(spear13xx_pcie->clk);
+	if (ret) {
+		dev_err(dev, "couldn't enable clk for pcie\n");
+		return ret;
+	}
+
+	pp = &spear13xx_pcie->pp;
+
+	pp->dev = dev;
+
+	dbi_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	pp->dbi_base = devm_ioremap_resource(dev, dbi_base);
+	if (IS_ERR(pp->dbi_base)) {
+		dev_err(dev, "couldn't remap dbi base %p\n", dbi_base);
+		ret = PTR_ERR(pp->dbi_base);
+		goto fail_clk;
+	}
+	spear13xx_pcie->app_base = pp->dbi_base + 0x2000;
+
+	if (of_property_read_bool(np, "st,pcie-is-gen1"))
+		spear13xx_pcie->is_gen1 = true;
+
+	ret = add_pcie_port(pp, pdev);
+	if (ret < 0)
+		goto fail_clk;
+
+	platform_set_drvdata(pdev, spear13xx_pcie);
+	return 0;
+
+fail_clk:
+	clk_disable_unprepare(spear13xx_pcie->clk);
+
+	return ret;
+}
+
+static const struct of_device_id spear13xx_pcie_of_match[] = {
+	{ .compatible = "st,spear1340-pcie", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, spear13xx_pcie_of_match);
+
+static struct platform_driver spear13xx_pcie_driver __initdata = {
+	.probe		= spear13xx_pcie_probe,
+	.driver = {
+		.name	= "spear-pcie",
+		.owner	= THIS_MODULE,
+		.of_match_table = of_match_ptr(spear13xx_pcie_of_match),
+	},
+};
+
+/* SPEAr13xx PCIe driver does not allow module unload */
+
+static int __init pcie_init(void)
+{
+	return platform_driver_register(&spear13xx_pcie_driver);
+}
+module_init(pcie_init);
+
+MODULE_DESCRIPTION("ST Microelectronics SPEAr13xx PCIe host controller driver");
+MODULE_AUTHOR("Pratyush Anand <pratyush.anand@st.com>");
+MODULE_LICENSE("GPL v2");