Message-ID: <1535096165-45827-3-git-send-email-hanjie.lin@amlogic.com>
Date:   Fri, 24 Aug 2018 15:36:04 +0800
From:   Hanjie Lin <hanjie.lin@...ogic.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>
CC:     Yue Wang <yue.wang@...ogic.com>,
        Hanjie Lin <hanjie.lin@...ogic.com>,
        Kevin Hilman <khilman@...libre.com>,
        Rob Herring <robh@...nel.org>, <linux-kernel@...r.kernel.org>,
        <linux-pci@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-amlogic@...ts.infradead.org>,
        Yixun Lan <yixun.lan@...ogic.com>,
        Liang Yang <liang.yang@...ogic.com>,
        Jianxin Pan <jianxin.pan@...ogic.com>,
        Qiufang Dai <qiufang.dai@...ogic.com>,
        Jian Hu <jian.hu@...ogic.com>
Subject: [PATCH v2 2/2] PCI: meson: add the Amlogic Meson PCIe controller driver

From: Yue Wang <yue.wang@...ogic.com>

The Amlogic Meson PCIe host controller is based on the Synopsys DesignWare
PCI core. This patch adds the driver support for Meson PCIe controller.

Signed-off-by: Yue Wang <yue.wang@...ogic.com>
Signed-off-by: Hanjie Lin <hanjie.lin@...ogic.com>
---
 drivers/pci/controller/dwc/Kconfig     |  12 +
 drivers/pci/controller/dwc/Makefile    |   1 +
 drivers/pci/controller/dwc/pci-meson.c | 613 +++++++++++++++++++++++++++++++++
 3 files changed, 626 insertions(+)
 create mode 100644 drivers/pci/controller/dwc/pci-meson.c

diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig
index 91b0194..6cb36f6 100644
--- a/drivers/pci/controller/dwc/Kconfig
+++ b/drivers/pci/controller/dwc/Kconfig
@@ -193,4 +193,16 @@ config PCIE_HISI_STB
 	help
           Say Y here if you want PCIe controller support on HiSilicon STB SoCs
 
+config PCI_MESON
+	bool "MESON PCIe controller"
+	depends on PCI
+	depends on PCI_MSI_IRQ_DOMAIN
+	select PCIEPORTBUS
+	select PCIE_DW_HOST
+	help
+	  Say Y here if you want to enable PCI controller support on Amlogic
+	  SoCs. The PCI controller on Amlogic is based on DesignWare hardware
+	  and therefore the driver re-uses the DesignWare core functions to
+	  implement the driver.
+
 endmenu
diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile
index 5d2ce72..cf676bd 100644
--- a/drivers/pci/controller/dwc/Makefile
+++ b/drivers/pci/controller/dwc/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_PCIE_ARMADA_8K) += pcie-armada8k.o
 obj-$(CONFIG_PCIE_ARTPEC6) += pcie-artpec6.o
 obj-$(CONFIG_PCIE_KIRIN) += pcie-kirin.o
 obj-$(CONFIG_PCIE_HISI_STB) += pcie-histb.o
+obj-$(CONFIG_PCI_MESON) += pci-meson.o
 
 # The following drivers are for devices that use the generic ACPI
 # pci_root.c driver but don't support standard ECAM config access.
diff --git a/drivers/pci/controller/dwc/pci-meson.c b/drivers/pci/controller/dwc/pci-meson.c
new file mode 100644
index 0000000..a9edf20
--- /dev/null
+++ b/drivers/pci/controller/dwc/pci-meson.c
@@ -0,0 +1,613 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCIe host controller driver for Amlogic MESON SoCs
+ *
+ * Copyright (c) 2018 Amlogic, inc.
+ * Author: Yue Wang <yue.wang@...ogic.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/phy/phy.h>
+#include <linux/resource.h>
+#include <linux/types.h>
+#include <linux/reset.h>
+
+#include "pcie-designware.h"
+
+#define to_meson_pcie(x) dev_get_drvdata((x)->dev)
+
+/* External local bus interface registers */
+#define PLR_OFFSET			0x700
+#define PCIE_PORT_LINK_CTRL_OFF		(PLR_OFFSET + 0x10)
+#define FAST_LINK_MODE			BIT(7)
+#define LINK_CAPABLE_MASK		GENMASK(21, 16)
+#define LINK_CAPABLE_X1			BIT(16)
+
+#define PCIE_GEN2_CTRL_OFF		(PLR_OFFSET + 0x10c)
+#define NUM_OF_LANES_MASK		GENMASK(12, 8)
+#define NUM_OF_LANES_X1			BIT(8)
+#define DIRECT_SPEED_CHANGE		BIT(17)
+
+#define TYPE1_HDR_OFFSET		0x0
+#define PCIE_STATUS_COMMAND		(TYPE1_HDR_OFFSET + 0x04)
+#define PCI_IO_EN			BIT(0)
+#define PCI_MEM_SPACE_EN		BIT(1)
+#define PCI_BUS_MASTER_EN		BIT(2)
+
+#define PCIE_BASE_ADDR0			(TYPE1_HDR_OFFSET + 0x10)
+#define PCIE_BASE_ADDR1			(TYPE1_HDR_OFFSET + 0x14)
+
+#define PCIE_CAP_OFFSET			0x70
+#define PCIE_DEV_CTRL_DEV_STUS		(PCIE_CAP_OFFSET + 0x08)
+#define PCIE_CAP_MAX_PAYLOAD_MASK	GENMASK(7, 5)
+#define PCIE_CAP_MAX_PAYLOAD_SIZE(x)	((x) << 5)
+#define PCIE_CAP_MAX_READ_REQ_MASK	GENMASK(14, 12)
+#define PCIE_CAP_MAX_READ_REQ_SIZE(x)	((x) << 12)
+
+#define PCI_CLASS_REVISION_MASK		GENMASK(7, 0)
+
+/* PCIe specific config registers */
+#define PCIE_CFG0			0x0
+#define APP_LTSSM_ENABLE		BIT(7)
+
+#define PCIE_CFG_STATUS12		0x30
+#define IS_SMLH_LINK_UP(x)		((x) & (1 << 6))
+#define IS_RDLH_LINK_UP(x)		((x) & (1 << 16))
+#define IS_LTSSM_UP(x)			((((x) >> 10) & 0x1f) == 0x11)
+
+#define PCIE_CFG_STATUS17		0x44
+#define PM_CURRENT_STATE(x)		(((x) >> 7) & 0x1)
+
+#define WAIT_LINKUP_TIMEOUT		2000
+#define PORT_CLK_RATE			100000000UL
+#define MAX_PAYLOAD_SIZE		256
+#define MAX_READ_REQ_SIZE		256
+
+enum pcie_data_rate {
+	PCIE_GEN1,
+	PCIE_GEN2,
+	PCIE_GEN3,
+	PCIE_GEN4
+};
+
+struct meson_pcie_mem_res {
+	void __iomem *elbi_base; /* DT 0th resource */
+	void __iomem *cfg_base; /* DT 2nd resource */
+};
+
+struct meson_pcie_clk_res {
+	struct clk *clk;
+	struct clk *mipi_gate;
+	struct clk *port_clk;
+	struct clk *general_clk;
+};
+
+struct meson_pcie_rc_reset {
+	struct reset_control *port;
+	struct reset_control *apb;
+};
+
+struct meson_pcie {
+	struct dw_pcie pci;
+	struct meson_pcie_mem_res mem_res;
+	struct meson_pcie_clk_res clk_res;
+	struct meson_pcie_rc_reset mrst;
+	struct gpio_desc *reset_gpio;
+
+	struct phy *phy;
+	enum of_gpio_flags gpio_flag;
+	int pcie_num;
+	u32 port_num;
+	u32 device_attch;
+};
+
+static int meson_pcie_get_mem(struct platform_device *pdev,
+			      struct meson_pcie *mp)
+{
+	struct device *dev = mp->pci.dev;
+	struct resource *res;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "elbi");
+	if (!res)
+		return -ENODEV;
+
+	mp->mem_res.elbi_base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(mp->mem_res.elbi_base))
+		return PTR_ERR(mp->mem_res.elbi_base);
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg");
+	if (!res)
+		return -ENODEV;
+
+	mp->mem_res.cfg_base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(mp->mem_res.cfg_base))
+		return PTR_ERR(mp->mem_res.cfg_base);
+
+	return 0;
+}
+
+static void meson_pcie_rc_reset(struct meson_pcie *mp)
+{
+	struct meson_pcie_rc_reset *mrst = &mp->mrst;
+
+	reset_control_assert(mrst->port);
+	reset_control_assert(mrst->apb);
+	udelay(400);
+	reset_control_deassert(mrst->port);
+	reset_control_deassert(mrst->apb);
+	udelay(500);
+}
+
+static int meson_pcie_init_clk(struct meson_pcie *mp)
+{
+	struct device *dev = mp->pci.dev;
+	struct meson_pcie_clk_res *res = &mp->clk_res;
+	int ret;
+
+	res->port_clk = devm_clk_get(dev, "port");
+	if (IS_ERR(res->port_clk)) {
+		if (PTR_ERR(res->port_clk) != -EPROBE_DEFER)
+			dev_err(dev, "Failed to get pcie port clock\n");
+
+		return PTR_ERR(res->port_clk);
+	}
+
+	res->mipi_gate = devm_clk_get(dev, "pcie_mipi_en");
+	if (IS_ERR(res->mipi_gate)) {
+		if (PTR_ERR(res->mipi_gate) != -EPROBE_DEFER)
+			dev_err(dev, "Failed to get pcie mipi clock\n");
+
+		return PTR_ERR(res->mipi_gate);
+	}
+
+	res->general_clk = devm_clk_get(dev, "pcie_general");
+	if (IS_ERR(res->general_clk)) {
+		if (PTR_ERR(res->general_clk) != -EPROBE_DEFER)
+			dev_err(dev, "Failed to get pcie general clock\n");
+
+		return PTR_ERR(res->general_clk);
+	}
+
+	res->clk = devm_clk_get(dev, "pcie");
+	if (IS_ERR(res->clk)) {
+		if (PTR_ERR(res->clk) != -EPROBE_DEFER)
+			dev_err(dev, "Failed to get pcie rc clock\n");
+
+		return PTR_ERR(res->clk);
+	}
+
+	phy_init(mp->phy);
+	meson_pcie_rc_reset(mp);
+
+	ret = clk_set_rate(res->port_clk, PORT_CLK_RATE);
+	if (ret) {
+		dev_err(dev, "set bus clk rate failed, ret = %d", ret);
+		goto err_clk;
+	}
+
+	ret = clk_prepare_enable(res->port_clk);
+	if (ret) {
+		dev_err(dev, "cannot enable pcie port clock");
+		goto err_clk;
+	}
+
+	ret = clk_prepare_enable(res->mipi_gate);
+	if (ret) {
+		dev_err(dev, "cannot enable pcie mipi gate clock");
+		goto err_port_clk;
+	}
+
+	ret = clk_prepare_enable(res->general_clk);
+	if (ret) {
+		dev_err(dev, "cannot enable pcie general clock");
+		goto err_mipi_gate;
+	}
+
+	ret = clk_prepare_enable(res->clk);
+	if (ret) {
+		dev_err(dev, "cannot enable pcie rc clock");
+		goto err_general_clk;
+	}
+
+	return 0;
+
+err_general_clk:
+	clk_disable_unprepare(res->general_clk);
+err_mipi_gate:
+	clk_disable_unprepare(res->mipi_gate);
+err_port_clk:
+	clk_disable_unprepare(res->port_clk);
+err_clk:
+	return ret;
+}
+
+static void meson_pcie_deinit_clk(struct meson_pcie *mp)
+{
+	clk_disable_unprepare(mp->clk_res.clk);
+	clk_disable_unprepare(mp->clk_res.general_clk);
+	clk_disable_unprepare(mp->clk_res.mipi_gate);
+	clk_disable_unprepare(mp->clk_res.port_clk);
+}
+
+static inline void meson_elb_writel(struct meson_pcie *mp, u32 val, u32 reg)
+{
+	writel(val, mp->mem_res.elbi_base + reg);
+}
+
+static inline u32 meson_elb_readl(struct meson_pcie *mp, u32 reg)
+{
+	return readl(mp->mem_res.elbi_base + reg);
+}
+
+static inline u32 meson_cfg_readl(struct meson_pcie *mp, u32 reg)
+{
+	return readl(mp->mem_res.cfg_base + reg);
+}
+
+static inline void meson_cfg_writel(struct meson_pcie *mp, u32 val, u32 reg)
+{
+	writel(val, mp->mem_res.cfg_base + reg);
+}
+
+static void meson_pcie_assert_reset(struct meson_pcie *mp)
+{
+	gpiod_set_value_cansleep(mp->reset_gpio, 0);
+	udelay(500);
+	gpiod_set_value_cansleep(mp->reset_gpio, 1);
+}
+
+static void meson_pcie_init_dw(struct meson_pcie *mp)
+{
+	u32 val = 0;
+
+	val = meson_cfg_readl(mp, PCIE_CFG0);
+	val |= APP_LTSSM_ENABLE;
+	meson_cfg_writel(mp, val, PCIE_CFG0);
+
+	val = meson_elb_readl(mp, PCIE_PORT_LINK_CTRL_OFF);
+	val &= ~LINK_CAPABLE_MASK;
+	meson_elb_writel(mp, val, PCIE_PORT_LINK_CTRL_OFF);
+
+	val = meson_elb_readl(mp, PCIE_PORT_LINK_CTRL_OFF);
+	val |= LINK_CAPABLE_X1 | FAST_LINK_MODE;
+	meson_elb_writel(mp, val, PCIE_PORT_LINK_CTRL_OFF);
+
+	val = meson_elb_readl(mp, PCIE_GEN2_CTRL_OFF);
+	val &= ~NUM_OF_LANES_MASK;
+	meson_elb_writel(mp, val, PCIE_GEN2_CTRL_OFF);
+
+	val = meson_elb_readl(mp, PCIE_GEN2_CTRL_OFF);
+	val |= NUM_OF_LANES_X1 | DIRECT_SPEED_CHANGE;
+	meson_elb_writel(mp, val, PCIE_GEN2_CTRL_OFF);
+
+	meson_elb_writel(mp, 0x0, PCIE_BASE_ADDR0);
+	meson_elb_writel(mp, 0x0, PCIE_BASE_ADDR1);
+}
+
+static int meson_size_to_payload(int size)
+{
+	if (size & (size - 1) || size < 128 || size > 4096)
+		return 1;
+
+	return fls(size) - 8;
+}
+
+static void meson_set_max_payload(struct meson_pcie *mp, int size)
+{
+	u32 val = 0;
+	int max_payload_size = meson_size_to_payload(size);
+
+	val = meson_elb_readl(mp, PCIE_DEV_CTRL_DEV_STUS);
+	val &= ~PCIE_CAP_MAX_PAYLOAD_MASK;
+	meson_elb_writel(mp, val, PCIE_DEV_CTRL_DEV_STUS);
+
+	val = meson_elb_readl(mp, PCIE_DEV_CTRL_DEV_STUS);
+	val |= PCIE_CAP_MAX_PAYLOAD_SIZE(max_payload_size);
+	meson_elb_writel(mp, val, PCIE_DEV_CTRL_DEV_STUS);
+}
+
+static void meson_set_max_rd_req_size(struct meson_pcie *mp, int size)
+{
+	u32 val = 0;
+	int max_rd_req_size = meson_size_to_payload(size);
+
+	val = meson_elb_readl(mp, PCIE_DEV_CTRL_DEV_STUS);
+	val &= ~PCIE_CAP_MAX_READ_REQ_MASK;
+	meson_elb_writel(mp, val, PCIE_DEV_CTRL_DEV_STUS);
+
+	val = meson_elb_readl(mp, PCIE_DEV_CTRL_DEV_STUS);
+	val |= PCIE_CAP_MAX_READ_REQ_SIZE(max_rd_req_size);
+	meson_elb_writel(mp, val, PCIE_DEV_CTRL_DEV_STUS);
+}
+
+static inline void meson_enable_memory_space(struct meson_pcie *mp)
+{
+	/* Set the RC Bus Master, Memory Space and I/O Space enables */
+	meson_elb_writel(mp, PCI_IO_EN | PCI_MEM_SPACE_EN | PCI_BUS_MASTER_EN,
+			 PCIE_STATUS_COMMAND);
+}
+
+static int meson_pcie_establish_link(struct meson_pcie *mp)
+{
+	struct dw_pcie *pci = &mp->pci;
+	struct pcie_port *pp = &pci->pp;
+
+	meson_pcie_init_dw(mp);
+	meson_set_max_payload(mp, MAX_PAYLOAD_SIZE);
+	meson_set_max_rd_req_size(mp, MAX_READ_REQ_SIZE);
+
+	dw_pcie_setup_rc(pp);
+	meson_enable_memory_space(mp);
+
+	meson_pcie_assert_reset(mp);
+
+	/* check if the link is up or not */
+	if (!dw_pcie_wait_for_link(pci))
+		return 0;
+
+	return -ETIMEDOUT;
+}
+
+static void meson_pcie_msi_init(struct meson_pcie *mp)
+{
+	struct pcie_port *pp = &mp->pci.pp;
+
+	dw_pcie_msi_init(pp);
+}
+
+static void meson_pcie_enable_interrupts(struct meson_pcie *mp)
+{
+	if (IS_ENABLED(CONFIG_PCI_MSI))
+		meson_pcie_msi_init(mp);
+}
+
+static u32 meson_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base,
+			       u32 reg, size_t size)
+{
+	u32 val;
+
+	dw_pcie_read(base + reg, size, &val);
+
+	return val;
+}
+
+static void meson_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base,
+				 u32 reg, size_t size, u32 val)
+{
+	dw_pcie_write(base + reg, size, val);
+}
+
+static int meson_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
+				  u32 *val)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	struct meson_pcie *mp = to_meson_pcie(pci);
+
+	if (!mp->device_attch)
+		return 0;
+
+	/* the device class is not reported correctly from the register */
+	if (where == PCI_CLASS_REVISION) {
+		*val = readl(pci->dbi_base + PCI_CLASS_REVISION);
+		/* keep revision id */
+		*val &= PCI_CLASS_REVISION_MASK;
+		*val |= PCI_CLASS_BRIDGE_PCI << 16;
+		return PCIBIOS_SUCCESSFUL;
+	}
+
+	return dw_pcie_read(pci->dbi_base + where, size, val);
+}
+
+static int meson_pcie_wr_own_conf(struct pcie_port *pp, int where,
+				  int size, u32 val)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	struct meson_pcie *mp = to_meson_pcie(pci);
+
+	if (!mp->device_attch)
+		return 0;
+
+	return dw_pcie_write(pci->dbi_base + where, size, val);
+}
+
+static int meson_pcie_link_up(struct dw_pcie *pci)
+{
+	struct meson_pcie *mp = to_meson_pcie(pci);
+	struct device *dev = pci->dev;
+	u32 smlh_up = 0;
+	u32 ltssm_up = 0;
+	u32 rdlh_up = 0;
+	u32 speed_okay = 0;
+	u32 cnt = 0;
+	u32 state12, state17;
+
+	while (smlh_up == 0 || rdlh_up == 0 || ltssm_up == 0 ||
+	       speed_okay == 0) {
+		udelay(20);
+
+		state12 = meson_cfg_readl(mp, PCIE_CFG_STATUS12);
+		state17 = meson_cfg_readl(mp, PCIE_CFG_STATUS17);
+		smlh_up = IS_SMLH_LINK_UP(state12);
+		rdlh_up = IS_RDLH_LINK_UP(state12);
+		ltssm_up = IS_LTSSM_UP(state12);
+
+		if (PM_CURRENT_STATE(state17) < PCIE_GEN3)
+			speed_okay = 1;
+
+		if (smlh_up)
+			dev_dbg(dev, "smlh_link_up is on\n");
+		if (rdlh_up)
+			dev_dbg(dev, "rdlh_link_up is on\n");
+		if (ltssm_up)
+			dev_dbg(dev, "ltssm_up is on\n");
+		if (speed_okay)
+			dev_dbg(dev, "speed_okay\n");
+
+		cnt++;
+
+		if (cnt >= WAIT_LINKUP_TIMEOUT) {
+			dev_err(dev, "Error: Wait linkup timeout.\n");
+			return 0;
+		}
+	}
+
+	return 1;
+}
+
+static int meson_pcie_host_init(struct pcie_port *pp)
+{
+	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+	struct meson_pcie *mp = to_meson_pcie(pci);
+	int ret;
+
+	ret = meson_pcie_establish_link(mp);
+
+	if (ret)
+		return ret;
+
+	mp->device_attch = 1;
+	meson_pcie_enable_interrupts(mp);
+
+	return 0;
+}
+
+static const struct dw_pcie_host_ops meson_pcie_host_ops = {
+	.rd_own_conf = meson_pcie_rd_own_conf,
+	.wr_own_conf = meson_pcie_wr_own_conf,
+	.host_init = meson_pcie_host_init,
+};
+
+static int meson_add_pcie_port(struct meson_pcie *mp,
+			       struct platform_device *pdev)
+{
+	struct dw_pcie *pci = &mp->pci;
+	struct pcie_port *pp = &pci->pp;
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	if (IS_ENABLED(CONFIG_PCI_MSI)) {
+		pp->msi_irq = platform_get_irq(pdev, 0);
+		if (pp->msi_irq < 0) {
+			dev_err(dev, "failed to get msi irq\n");
+			return pp->msi_irq;
+		}
+	}
+
+	pp->root_bus_nr = -1;
+	pp->ops = &meson_pcie_host_ops;
+	pci->dbi_base = mp->mem_res.elbi_base;
+
+	ret = dw_pcie_host_init(pp);
+	if (ret) {
+		dev_err(dev, "failed to initialize host\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static const struct dw_pcie_ops dw_pcie_ops = {
+	.read_dbi = meson_pcie_read_dbi,
+	.write_dbi = meson_pcie_write_dbi,
+	.link_up = meson_pcie_link_up,
+};
+
+static int meson_pcie_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct dw_pcie *pci;
+	struct meson_pcie *mp;
+	struct meson_pcie_rc_reset *mrst;
+	int ret;
+
+	mp = devm_kzalloc(dev, sizeof(*mp), GFP_KERNEL);
+	if (!mp)
+		return -ENOMEM;
+
+	pci = &mp->pci;
+	pci->dev = dev;
+	pci->ops = &dw_pcie_ops;
+
+	mp->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(mp->reset_gpio)) {
+		dev_err(dev, "Get reset gpio failed\n");
+		return PTR_ERR(mp->reset_gpio);
+	}
+
+	mp->phy = devm_of_phy_get(dev, np, NULL);
+	if (IS_ERR(mp->phy)) {
+		if (PTR_ERR(mp->phy) != -EPROBE_DEFER)
+			dev_err(dev, "Get phy failed, set default %ld\n",
+				PTR_ERR(mp->phy));
+		return PTR_ERR(mp->phy);
+	}
+
+	mrst = &mp->mrst;
+
+	mrst->port = devm_reset_control_get_shared(dev, "port");
+	if (IS_ERR(mrst->port)) {
+		if (PTR_ERR(mrst->port) != -EPROBE_DEFER)
+			dev_err(dev, "couldn't get port reset %ld\n",
+				PTR_ERR(mrst->port));
+
+		return PTR_ERR(mrst->port);
+	}
+
+	mrst->apb = devm_reset_control_get_shared(dev, "apb");
+	if (IS_ERR(mrst->apb)) {
+		if (PTR_ERR(mrst->apb) != -EPROBE_DEFER)
+			dev_err(dev, "couldn't get apb reset\n");
+
+		return PTR_ERR(mrst->apb);
+	}
+
+	reset_control_deassert(mrst->port);
+	reset_control_deassert(mrst->apb);
+
+	phy_power_on(mp->phy);
+
+	ret = meson_pcie_init_clk(mp);
+	if (ret) {
+		dev_err(dev, "Init clock resources failed, %d\n", ret);
+		return ret;
+	}
+
+	ret = meson_pcie_get_mem(pdev, mp);
+	if (ret) {
+		dev_err(dev, "Get memory resource failed, %d\n", ret);
+		return ret;
+	}
+
+	platform_set_drvdata(pdev, mp);
+
+	ret = meson_add_pcie_port(mp, pdev);
+	if (ret < 0) {
+		dev_err(dev, "Add PCIE port failed, %d\n", ret);
+		meson_pcie_deinit_clk(mp);
+	}
+
+	return ret;
+}
+
+static const struct of_device_id meson_pcie_of_match[] = {
+	{
+		.compatible = "amlogic,axg-pcie",
+	},
+	{},
+};
+
+static struct platform_driver meson_pcie_driver = {
+	.probe = meson_pcie_probe,
+	.driver = {
+		.name = "meson-pcie",
+		.of_match_table = meson_pcie_of_match,
+	},
+};
+
+builtin_platform_driver(meson_pcie_driver);
-- 
2.7.4

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