select SYS_SUPPORTS_HIGHMEM
select MIPS_GIC
select CLKSRC_MIPS_GIC
- select HAVE_PCI if PCI_MT7621
+ select HAVE_PCI
+ select PCI_DRIVERS_GENERIC
select SOC_BUS
endchoice
Say Y here if you want error handling support
for the PCIe controller's errors on HiSilicon HIP SoCs
+config PCIE_MT7621
+ tristate "MediaTek MT7621 PCIe Controller"
+ depends on (RALINK && SOC_MT7621) || (MIPS && COMPILE_TEST)
+ select PHY_MT7621_PCI
+ default SOC_MT7621
+ help
+ This selects a driver for the MediaTek MT7621 PCIe Controller.
+
source "drivers/pci/controller/dwc/Kconfig"
source "drivers/pci/controller/mobiveil/Kconfig"
source "drivers/pci/controller/cadence/Kconfig"
obj-$(CONFIG_PCIE_BRCMSTB) += pcie-brcmstb.o
obj-$(CONFIG_PCI_LOONGSON) += pci-loongson.o
obj-$(CONFIG_PCIE_HISI_ERR) += pcie-hisi-error.o
+obj-$(CONFIG_PCIE_MT7621) += pcie-mt7621.o
+
# pcie-hisi.o quirks are needed even without CONFIG_PCIE_DW
obj-y += dwc/
obj-y += mobiveil/
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * BRIEF MODULE DESCRIPTION
+ * PCI init for Ralink RT2880 solution
+ *
+ * Copyright 2007 Ralink Inc. (bruce_chang@ralinktech.com.tw)
+ *
+ * May 2007 Bruce Chang
+ * Initial Release
+ *
+ * May 2009 Bruce Chang
+ * support RT2880/RT3883 PCIe
+ *
+ * May 2011 Bruce Chang
+ * support RT6855/MT7620 PCIe
+ */
+
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_pci.h>
+#include <linux/of_platform.h>
+#include <linux/pci.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+#include <linux/sys_soc.h>
+
+/* MediaTek-specific configuration registers */
+#define PCIE_FTS_NUM 0x70c
+#define PCIE_FTS_NUM_MASK GENMASK(15, 8)
+#define PCIE_FTS_NUM_L0(x) (((x) & 0xff) << 8)
+
+/* Host-PCI bridge registers */
+#define RALINK_PCI_PCICFG_ADDR 0x0000
+#define RALINK_PCI_PCIMSK_ADDR 0x000c
+#define RALINK_PCI_CONFIG_ADDR 0x0020
+#define RALINK_PCI_CONFIG_DATA 0x0024
+#define RALINK_PCI_MEMBASE 0x0028
+#define RALINK_PCI_IOBASE 0x002c
+
+/* PCIe RC control registers */
+#define RALINK_PCI_ID 0x0030
+#define RALINK_PCI_CLASS 0x0034
+#define RALINK_PCI_SUBID 0x0038
+#define RALINK_PCI_STATUS 0x0050
+
+/* Some definition values */
+#define PCIE_REVISION_ID BIT(0)
+#define PCIE_CLASS_CODE (0x60400 << 8)
+#define PCIE_BAR_MAP_MAX GENMASK(30, 16)
+#define PCIE_BAR_ENABLE BIT(0)
+#define PCIE_PORT_INT_EN(x) BIT(20 + (x))
+#define PCIE_PORT_LINKUP BIT(0)
+#define PCIE_PORT_CNT 3
+
+#define PERST_DELAY_MS 100
+
+/**
+ * struct mt7621_pcie_port - PCIe port information
+ * @base: I/O mapped register base
+ * @list: port list
+ * @pcie: pointer to PCIe host info
+ * @clk: pointer to the port clock gate
+ * @phy: pointer to PHY control block
+ * @pcie_rst: pointer to port reset control
+ * @gpio_rst: gpio reset
+ * @slot: port slot
+ * @enabled: indicates if port is enabled
+ */
+struct mt7621_pcie_port {
+ void __iomem *base;
+ struct list_head list;
+ struct mt7621_pcie *pcie;
+ struct clk *clk;
+ struct phy *phy;
+ struct reset_control *pcie_rst;
+ struct gpio_desc *gpio_rst;
+ u32 slot;
+ bool enabled;
+};
+
+/**
+ * struct mt7621_pcie - PCIe host information
+ * @base: IO Mapped Register Base
+ * @dev: Pointer to PCIe device
+ * @ports: pointer to PCIe port information
+ * @resets_inverted: depends on chip revision
+ * reset lines are inverted.
+ */
+struct mt7621_pcie {
+ void __iomem *base;
+ struct device *dev;
+ struct list_head ports;
+ bool resets_inverted;
+};
+
+static inline u32 pcie_read(struct mt7621_pcie *pcie, u32 reg)
+{
+ return readl_relaxed(pcie->base + reg);
+}
+
+static inline void pcie_write(struct mt7621_pcie *pcie, u32 val, u32 reg)
+{
+ writel_relaxed(val, pcie->base + reg);
+}
+
+static inline void pcie_rmw(struct mt7621_pcie *pcie, u32 reg, u32 clr, u32 set)
+{
+ u32 val = readl_relaxed(pcie->base + reg);
+
+ val &= ~clr;
+ val |= set;
+ writel_relaxed(val, pcie->base + reg);
+}
+
+static inline u32 pcie_port_read(struct mt7621_pcie_port *port, u32 reg)
+{
+ return readl_relaxed(port->base + reg);
+}
+
+static inline void pcie_port_write(struct mt7621_pcie_port *port,
+ u32 val, u32 reg)
+{
+ writel_relaxed(val, port->base + reg);
+}
+
+static inline u32 mt7621_pci_get_cfgaddr(unsigned int bus, unsigned int slot,
+ unsigned int func, unsigned int where)
+{
+ return (((where & 0xf00) >> 8) << 24) | (bus << 16) | (slot << 11) |
+ (func << 8) | (where & 0xfc) | 0x80000000;
+}
+
+static void __iomem *mt7621_pcie_map_bus(struct pci_bus *bus,
+ unsigned int devfn, int where)
+{
+ struct mt7621_pcie *pcie = bus->sysdata;
+ u32 address = mt7621_pci_get_cfgaddr(bus->number, PCI_SLOT(devfn),
+ PCI_FUNC(devfn), where);
+
+ writel_relaxed(address, pcie->base + RALINK_PCI_CONFIG_ADDR);
+
+ return pcie->base + RALINK_PCI_CONFIG_DATA + (where & 3);
+}
+
+struct pci_ops mt7621_pci_ops = {
+ .map_bus = mt7621_pcie_map_bus,
+ .read = pci_generic_config_read,
+ .write = pci_generic_config_write,
+};
+
+static u32 read_config(struct mt7621_pcie *pcie, unsigned int dev, u32 reg)
+{
+ u32 address = mt7621_pci_get_cfgaddr(0, dev, 0, reg);
+
+ pcie_write(pcie, address, RALINK_PCI_CONFIG_ADDR);
+ return pcie_read(pcie, RALINK_PCI_CONFIG_DATA);
+}
+
+static void write_config(struct mt7621_pcie *pcie, unsigned int dev,
+ u32 reg, u32 val)
+{
+ u32 address = mt7621_pci_get_cfgaddr(0, dev, 0, reg);
+
+ pcie_write(pcie, address, RALINK_PCI_CONFIG_ADDR);
+ pcie_write(pcie, val, RALINK_PCI_CONFIG_DATA);
+}
+
+static inline void mt7621_rst_gpio_pcie_assert(struct mt7621_pcie_port *port)
+{
+ if (port->gpio_rst)
+ gpiod_set_value(port->gpio_rst, 1);
+}
+
+static inline void mt7621_rst_gpio_pcie_deassert(struct mt7621_pcie_port *port)
+{
+ if (port->gpio_rst)
+ gpiod_set_value(port->gpio_rst, 0);
+}
+
+static inline bool mt7621_pcie_port_is_linkup(struct mt7621_pcie_port *port)
+{
+ return (pcie_port_read(port, RALINK_PCI_STATUS) & PCIE_PORT_LINKUP) != 0;
+}
+
+static inline void mt7621_control_assert(struct mt7621_pcie_port *port)
+{
+ struct mt7621_pcie *pcie = port->pcie;
+
+ if (pcie->resets_inverted)
+ reset_control_assert(port->pcie_rst);
+ else
+ reset_control_deassert(port->pcie_rst);
+}
+
+static inline void mt7621_control_deassert(struct mt7621_pcie_port *port)
+{
+ struct mt7621_pcie *pcie = port->pcie;
+
+ if (pcie->resets_inverted)
+ reset_control_deassert(port->pcie_rst);
+ else
+ reset_control_assert(port->pcie_rst);
+}
+
+static int setup_cm_memory_region(struct pci_host_bridge *host)
+{
+ struct mt7621_pcie *pcie = pci_host_bridge_priv(host);
+ struct device *dev = pcie->dev;
+ struct resource_entry *entry;
+ resource_size_t mask;
+
+ entry = resource_list_first_type(&host->windows, IORESOURCE_MEM);
+ if (!entry) {
+ dev_err(dev, "cannot get memory resource\n");
+ return -EINVAL;
+ }
+
+ if (mips_cps_numiocu(0)) {
+ /*
+ * FIXME: hardware doesn't accept mask values with 1s after
+ * 0s (e.g. 0xffef), so it would be great to warn if that's
+ * about to happen
+ */
+ mask = ~(entry->res->end - entry->res->start);
+
+ write_gcr_reg1_base(entry->res->start);
+ write_gcr_reg1_mask(mask | CM_GCR_REGn_MASK_CMTGT_IOCU0);
+ dev_info(dev, "PCI coherence region base: 0x%08llx, mask/settings: 0x%08llx\n",
+ (unsigned long long)read_gcr_reg1_base(),
+ (unsigned long long)read_gcr_reg1_mask());
+ }
+
+ return 0;
+}
+
+static int mt7621_pcie_parse_port(struct mt7621_pcie *pcie,
+ struct device_node *node,
+ int slot)
+{
+ struct mt7621_pcie_port *port;
+ struct device *dev = pcie->dev;
+ struct platform_device *pdev = to_platform_device(dev);
+ char name[10];
+ int err;
+
+ port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
+ if (!port)
+ return -ENOMEM;
+
+ port->base = devm_platform_ioremap_resource(pdev, slot + 1);
+ if (IS_ERR(port->base))
+ return PTR_ERR(port->base);
+
+ port->clk = devm_get_clk_from_child(dev, node, NULL);
+ if (IS_ERR(port->clk)) {
+ dev_err(dev, "failed to get pcie%d clock\n", slot);
+ return PTR_ERR(port->clk);
+ }
+
+ port->pcie_rst = of_reset_control_get_exclusive(node, NULL);
+ if (PTR_ERR(port->pcie_rst) == -EPROBE_DEFER) {
+ dev_err(dev, "failed to get pcie%d reset control\n", slot);
+ return PTR_ERR(port->pcie_rst);
+ }
+
+ snprintf(name, sizeof(name), "pcie-phy%d", slot);
+ port->phy = devm_of_phy_get(dev, node, name);
+ if (IS_ERR(port->phy)) {
+ dev_err(dev, "failed to get pcie-phy%d\n", slot);
+ err = PTR_ERR(port->phy);
+ goto remove_reset;
+ }
+
+ port->gpio_rst = devm_gpiod_get_index_optional(dev, "reset", slot,
+ GPIOD_OUT_LOW);
+ if (IS_ERR(port->gpio_rst)) {
+ dev_err(dev, "failed to get GPIO for PCIe%d\n", slot);
+ err = PTR_ERR(port->gpio_rst);
+ goto remove_reset;
+ }
+
+ port->slot = slot;
+ port->pcie = pcie;
+
+ INIT_LIST_HEAD(&port->list);
+ list_add_tail(&port->list, &pcie->ports);
+
+ return 0;
+
+remove_reset:
+ reset_control_put(port->pcie_rst);
+ return err;
+}
+
+static int mt7621_pcie_parse_dt(struct mt7621_pcie *pcie)
+{
+ struct device *dev = pcie->dev;
+ struct platform_device *pdev = to_platform_device(dev);
+ struct device_node *node = dev->of_node, *child;
+ int err;
+
+ pcie->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(pcie->base))
+ return PTR_ERR(pcie->base);
+
+ for_each_available_child_of_node(node, child) {
+ int slot;
+
+ err = of_pci_get_devfn(child);
+ if (err < 0) {
+ of_node_put(child);
+ dev_err(dev, "failed to parse devfn: %d\n", err);
+ return err;
+ }
+
+ slot = PCI_SLOT(err);
+
+ err = mt7621_pcie_parse_port(pcie, child, slot);
+ if (err) {
+ of_node_put(child);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static int mt7621_pcie_init_port(struct mt7621_pcie_port *port)
+{
+ struct mt7621_pcie *pcie = port->pcie;
+ struct device *dev = pcie->dev;
+ u32 slot = port->slot;
+ int err;
+
+ err = phy_init(port->phy);
+ if (err) {
+ dev_err(dev, "failed to initialize port%d phy\n", slot);
+ return err;
+ }
+
+ err = phy_power_on(port->phy);
+ if (err) {
+ dev_err(dev, "failed to power on port%d phy\n", slot);
+ phy_exit(port->phy);
+ return err;
+ }
+
+ port->enabled = true;
+
+ return 0;
+}
+
+static void mt7621_pcie_reset_assert(struct mt7621_pcie *pcie)
+{
+ struct mt7621_pcie_port *port;
+
+ list_for_each_entry(port, &pcie->ports, list) {
+ /* PCIe RC reset assert */
+ mt7621_control_assert(port);
+
+ /* PCIe EP reset assert */
+ mt7621_rst_gpio_pcie_assert(port);
+ }
+
+ msleep(PERST_DELAY_MS);
+}
+
+static void mt7621_pcie_reset_rc_deassert(struct mt7621_pcie *pcie)
+{
+ struct mt7621_pcie_port *port;
+
+ list_for_each_entry(port, &pcie->ports, list)
+ mt7621_control_deassert(port);
+}
+
+static void mt7621_pcie_reset_ep_deassert(struct mt7621_pcie *pcie)
+{
+ struct mt7621_pcie_port *port;
+
+ list_for_each_entry(port, &pcie->ports, list)
+ mt7621_rst_gpio_pcie_deassert(port);
+
+ msleep(PERST_DELAY_MS);
+}
+
+static int mt7621_pcie_init_ports(struct mt7621_pcie *pcie)
+{
+ struct device *dev = pcie->dev;
+ struct mt7621_pcie_port *port, *tmp;
+ u8 num_disabled = 0;
+ int err;
+
+ mt7621_pcie_reset_assert(pcie);
+ mt7621_pcie_reset_rc_deassert(pcie);
+
+ list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
+ u32 slot = port->slot;
+
+ if (slot == 1) {
+ port->enabled = true;
+ continue;
+ }
+
+ err = mt7621_pcie_init_port(port);
+ if (err) {
+ dev_err(dev, "initializing port %d failed\n", slot);
+ list_del(&port->list);
+ }
+ }
+
+ mt7621_pcie_reset_ep_deassert(pcie);
+
+ tmp = NULL;
+ list_for_each_entry(port, &pcie->ports, list) {
+ u32 slot = port->slot;
+
+ if (!mt7621_pcie_port_is_linkup(port)) {
+ dev_err(dev, "pcie%d no card, disable it (RST & CLK)\n",
+ slot);
+ mt7621_control_assert(port);
+ port->enabled = false;
+ num_disabled++;
+
+ if (slot == 0) {
+ tmp = port;
+ continue;
+ }
+
+ if (slot == 1 && tmp && !tmp->enabled)
+ phy_power_off(tmp->phy);
+ }
+ }
+
+ return (num_disabled != PCIE_PORT_CNT) ? 0 : -ENODEV;
+}
+
+static void mt7621_pcie_enable_port(struct mt7621_pcie_port *port)
+{
+ struct mt7621_pcie *pcie = port->pcie;
+ u32 slot = port->slot;
+ u32 val;
+
+ /* enable pcie interrupt */
+ val = pcie_read(pcie, RALINK_PCI_PCIMSK_ADDR);
+ val |= PCIE_PORT_INT_EN(slot);
+ pcie_write(pcie, val, RALINK_PCI_PCIMSK_ADDR);
+
+ /* map 2G DDR region */
+ pcie_port_write(port, PCIE_BAR_MAP_MAX | PCIE_BAR_ENABLE,
+ PCI_BASE_ADDRESS_0);
+
+ /* configure class code and revision ID */
+ pcie_port_write(port, PCIE_CLASS_CODE | PCIE_REVISION_ID,
+ RALINK_PCI_CLASS);
+
+ /* configure RC FTS number to 250 when it leaves L0s */
+ val = read_config(pcie, slot, PCIE_FTS_NUM);
+ val &= ~PCIE_FTS_NUM_MASK;
+ val |= PCIE_FTS_NUM_L0(0x50);
+ write_config(pcie, slot, PCIE_FTS_NUM, val);
+}
+
+static int mt7621_pcie_enable_ports(struct pci_host_bridge *host)
+{
+ struct mt7621_pcie *pcie = pci_host_bridge_priv(host);
+ struct device *dev = pcie->dev;
+ struct mt7621_pcie_port *port;
+ struct resource_entry *entry;
+ int err;
+
+ entry = resource_list_first_type(&host->windows, IORESOURCE_IO);
+ if (!entry) {
+ dev_err(dev, "cannot get io resource\n");
+ return -EINVAL;
+ }
+
+ /* Setup MEMWIN and IOWIN */
+ pcie_write(pcie, 0xffffffff, RALINK_PCI_MEMBASE);
+ pcie_write(pcie, entry->res->start, RALINK_PCI_IOBASE);
+
+ list_for_each_entry(port, &pcie->ports, list) {
+ if (port->enabled) {
+ err = clk_prepare_enable(port->clk);
+ if (err) {
+ dev_err(dev, "enabling clk pcie%d\n",
+ port->slot);
+ return err;
+ }
+
+ mt7621_pcie_enable_port(port);
+ dev_info(dev, "PCIE%d enabled\n", port->slot);
+ }
+ }
+
+ return 0;
+}
+
+static int mt7621_pcie_register_host(struct pci_host_bridge *host)
+{
+ struct mt7621_pcie *pcie = pci_host_bridge_priv(host);
+
+ host->ops = &mt7621_pci_ops;
+ host->sysdata = pcie;
+ return pci_host_probe(host);
+}
+
+static const struct soc_device_attribute mt7621_pci_quirks_match[] = {
+ { .soc_id = "mt7621", .revision = "E2" }
+};
+
+static int mt7621_pci_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ const struct soc_device_attribute *attr;
+ struct mt7621_pcie_port *port;
+ struct mt7621_pcie *pcie;
+ struct pci_host_bridge *bridge;
+ int err;
+
+ if (!dev->of_node)
+ return -ENODEV;
+
+ bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
+ if (!bridge)
+ return -ENOMEM;
+
+ pcie = pci_host_bridge_priv(bridge);
+ pcie->dev = dev;
+ platform_set_drvdata(pdev, pcie);
+ INIT_LIST_HEAD(&pcie->ports);
+
+ attr = soc_device_match(mt7621_pci_quirks_match);
+ if (attr)
+ pcie->resets_inverted = true;
+
+ err = mt7621_pcie_parse_dt(pcie);
+ if (err) {
+ dev_err(dev, "parsing DT failed\n");
+ return err;
+ }
+
+ err = mt7621_pcie_init_ports(pcie);
+ if (err) {
+ dev_err(dev, "nothing connected in virtual bridges\n");
+ return 0;
+ }
+
+ err = mt7621_pcie_enable_ports(bridge);
+ if (err) {
+ dev_err(dev, "error enabling pcie ports\n");
+ goto remove_resets;
+ }
+
+ err = setup_cm_memory_region(bridge);
+ if (err) {
+ dev_err(dev, "error setting up iocu mem regions\n");
+ goto remove_resets;
+ }
+
+ return mt7621_pcie_register_host(bridge);
+
+remove_resets:
+ list_for_each_entry(port, &pcie->ports, list)
+ reset_control_put(port->pcie_rst);
+
+ return err;
+}
+
+static int mt7621_pci_remove(struct platform_device *pdev)
+{
+ struct mt7621_pcie *pcie = platform_get_drvdata(pdev);
+ struct mt7621_pcie_port *port;
+
+ list_for_each_entry(port, &pcie->ports, list)
+ reset_control_put(port->pcie_rst);
+
+ return 0;
+}
+
+static const struct of_device_id mt7621_pci_ids[] = {
+ { .compatible = "mediatek,mt7621-pci" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, mt7621_pci_ids);
+
+static struct platform_driver mt7621_pci_driver = {
+ .probe = mt7621_pci_probe,
+ .remove = mt7621_pci_remove,
+ .driver = {
+ .name = "mt7621-pci",
+ .of_match_table = of_match_ptr(mt7621_pci_ids),
+ },
+};
+builtin_platform_driver(mt7621_pci_driver);
source "drivers/staging/pi433/Kconfig"
-source "drivers/staging/mt7621-pci/Kconfig"
-
source "drivers/staging/mt7621-dma/Kconfig"
source "drivers/staging/ralink-gdma/Kconfig"
obj-$(CONFIG_GREYBUS) += greybus/
obj-$(CONFIG_BCM2835_VCHIQ) += vc04_services/
obj-$(CONFIG_PI433) += pi433/
-obj-$(CONFIG_PCI_MT7621) += mt7621-pci/
obj-$(CONFIG_SOC_MT7621) += mt7621-dma/
obj-$(CONFIG_DMA_RALINK) += ralink-gdma/
obj-$(CONFIG_SOC_MT7621) += mt7621-dts/
+++ /dev/null
-# SPDX-License-Identifier: GPL-2.0
-config PCI_MT7621
- tristate "MediaTek MT7621 PCI Controller"
- depends on RALINK
- select PCI_DRIVERS_GENERIC
- help
- This selects a driver for the MediaTek MT7621 PCI Controller.
-
+++ /dev/null
-# SPDX-License-Identifier: GPL-2.0
-obj-$(CONFIG_PCI_MT7621) += pci-mt7621.o
+++ /dev/null
-
-- general code review and cleanup
-
-Cc: NeilBrown <neil@brown.name>
+++ /dev/null
-MediaTek MT7621 PCIe controller
-
-Required properties:
-- compatible: "mediatek,mt7621-pci"
-- device_type: Must be "pci"
-- reg: Base addresses and lengths of the PCIe subsys and root ports.
-- bus-range: Range of bus numbers associated with this controller.
-- #address-cells: Address representation for root ports (must be 3)
-- pinctrl-names : The pin control state names.
-- pinctrl-0: The "default" pinctrl state.
-- #size-cells: Size representation for root ports (must be 2)
-- ranges: Ranges for the PCI memory and I/O regions.
-- #interrupt-cells: Must be 1
-- interrupt-map-mask and interrupt-map: Standard PCI IRQ mapping properties.
- Please refer to the standard PCI bus binding document for a more detailed
- explanation.
-- status: either "disabled" or "okay".
-- resets: Must contain an entry for each entry in reset-names.
- See ../reset/reset.txt for details.
-- reset-names: Must be "pcie0", "pcie1", "pcieN"... based on the number of
- root ports.
-- clocks: Must contain an entry for each entry in clock-names.
- See ../clocks/clock-bindings.txt for details.
-- clock-names: Must be "pcie0", "pcie1", "pcieN"... based on the number of
- root ports.
-- reset-gpios: GPIO specs for the reset pins.
-
-In addition, the device tree node must have sub-nodes describing each PCIe port
-interface, having the following mandatory properties:
-
-Required properties:
-- reg: Only the first four bytes are used to refer to the correct bus number
- and device number.
-- #address-cells: Must be 3
-- #size-cells: Must be 2
-- ranges: Sub-ranges distributed from the PCIe controller node. An empty
- property is sufficient.
-- bus-range: Range of bus numbers associated with this port.
-
-Example for MT7621:
-
- pcie: pcie@1e140000 {
- compatible = "mediatek,mt7621-pci";
- reg = <0x1e140000 0x100 /* host-pci bridge registers */
- 0x1e142000 0x100 /* pcie port 0 RC control registers */
- 0x1e143000 0x100 /* pcie port 1 RC control registers */
- 0x1e144000 0x100>; /* pcie port 2 RC control registers */
-
- #address-cells = <3>;
- #size-cells = <2>;
-
- pinctrl-names = "default";
- pinctrl-0 = <&pcie_pins>;
-
- device_type = "pci";
-
- bus-range = <0 255>;
- ranges = <
- 0x02000000 0 0x00000000 0x60000000 0 0x10000000 /* pci memory */
- 0x01000000 0 0x00000000 0x1e160000 0 0x00010000 /* io space */
- >;
-
- #interrupt-cells = <1>;
- interrupt-map-mask = <0xF0000 0 0 1>;
- interrupt-map = <0x10000 0 0 1 &gic GIC_SHARED 4 IRQ_TYPE_LEVEL_HIGH>,
- <0x20000 0 0 1 &gic GIC_SHARED 24 IRQ_TYPE_LEVEL_HIGH>,
- <0x30000 0 0 1 &gic GIC_SHARED 25 IRQ_TYPE_LEVEL_HIGH>;
-
- status = "disabled";
-
- resets = <&rstctrl 24 &rstctrl 25 &rstctrl 26>;
- reset-names = "pcie0", "pcie1", "pcie2";
- clocks = <&clkctrl 24 &clkctrl 25 &clkctrl 26>;
- clock-names = "pcie0", "pcie1", "pcie2";
-
- reset-gpios = <&gpio 19 GPIO_ACTIVE_LOW>,
- <&gpio 8 GPIO_ACTIVE_LOW>,
- <&gpio 7 GPIO_ACTIVE_LOW>;
-
- pcie@0,0 {
- reg = <0x0000 0 0 0 0>;
- #address-cells = <3>;
- #size-cells = <2>;
- ranges;
- bus-range = <0x00 0xff>;
- };
-
- pcie@1,0 {
- reg = <0x0800 0 0 0 0>;
- #address-cells = <3>;
- #size-cells = <2>;
- ranges;
- bus-range = <0x00 0xff>;
- };
-
- pcie@2,0 {
- reg = <0x1000 0 0 0 0>;
- #address-cells = <3>;
- #size-cells = <2>;
- ranges;
- bus-range = <0x00 0xff>;
- };
- };
-
+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0+
-/*
- * BRIEF MODULE DESCRIPTION
- * PCI init for Ralink RT2880 solution
- *
- * Copyright 2007 Ralink Inc. (bruce_chang@ralinktech.com.tw)
- *
- * May 2007 Bruce Chang
- * Initial Release
- *
- * May 2009 Bruce Chang
- * support RT2880/RT3883 PCIe
- *
- * May 2011 Bruce Chang
- * support RT6855/MT7620 PCIe
- */
-
-#include <linux/bitops.h>
-#include <linux/clk.h>
-#include <linux/delay.h>
-#include <linux/gpio/consumer.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/of_pci.h>
-#include <linux/of_platform.h>
-#include <linux/pci.h>
-#include <linux/phy/phy.h>
-#include <linux/platform_device.h>
-#include <linux/reset.h>
-#include <linux/sys_soc.h>
-
-/* MediaTek specific configuration registers */
-#define PCIE_FTS_NUM 0x70c
-#define PCIE_FTS_NUM_MASK GENMASK(15, 8)
-#define PCIE_FTS_NUM_L0(x) (((x) & 0xff) << 8)
-
-/* Host-PCI bridge registers */
-#define RALINK_PCI_PCICFG_ADDR 0x0000
-#define RALINK_PCI_PCIMSK_ADDR 0x000C
-#define RALINK_PCI_CONFIG_ADDR 0x0020
-#define RALINK_PCI_CONFIG_DATA 0x0024
-#define RALINK_PCI_MEMBASE 0x0028
-#define RALINK_PCI_IOBASE 0x002C
-
-/* PCIe RC control registers */
-#define RALINK_PCI_ID 0x0030
-#define RALINK_PCI_CLASS 0x0034
-#define RALINK_PCI_SUBID 0x0038
-#define RALINK_PCI_STATUS 0x0050
-
-/* Some definition values */
-#define PCIE_REVISION_ID BIT(0)
-#define PCIE_CLASS_CODE (0x60400 << 8)
-#define PCIE_BAR_MAP_MAX GENMASK(30, 16)
-#define PCIE_BAR_ENABLE BIT(0)
-#define PCIE_PORT_INT_EN(x) BIT(20 + (x))
-#define PCIE_PORT_LINKUP BIT(0)
-#define PCIE_PORT_CNT 3
-
-#define PERST_DELAY_MS 100
-
-/**
- * struct mt7621_pcie_port - PCIe port information
- * @base: I/O mapped register base
- * @list: port list
- * @pcie: pointer to PCIe host info
- * @clk: pointer to the port clock gate
- * @phy: pointer to PHY control block
- * @pcie_rst: pointer to port reset control
- * @gpio_rst: gpio reset
- * @slot: port slot
- * @enabled: indicates if port is enabled
- */
-struct mt7621_pcie_port {
- void __iomem *base;
- struct list_head list;
- struct mt7621_pcie *pcie;
- struct clk *clk;
- struct phy *phy;
- struct reset_control *pcie_rst;
- struct gpio_desc *gpio_rst;
- u32 slot;
- bool enabled;
-};
-
-/**
- * struct mt7621_pcie - PCIe host information
- * @base: IO Mapped Register Base
- * @dev: Pointer to PCIe device
- * @ports: pointer to PCIe port information
- * @resets_inverted: depends on chip revision
- * reset lines are inverted.
- */
-struct mt7621_pcie {
- void __iomem *base;
- struct device *dev;
- struct list_head ports;
- bool resets_inverted;
-};
-
-static inline u32 pcie_read(struct mt7621_pcie *pcie, u32 reg)
-{
- return readl_relaxed(pcie->base + reg);
-}
-
-static inline void pcie_write(struct mt7621_pcie *pcie, u32 val, u32 reg)
-{
- writel_relaxed(val, pcie->base + reg);
-}
-
-static inline void pcie_rmw(struct mt7621_pcie *pcie, u32 reg, u32 clr, u32 set)
-{
- u32 val = readl_relaxed(pcie->base + reg);
-
- val &= ~clr;
- val |= set;
- writel_relaxed(val, pcie->base + reg);
-}
-
-static inline u32 pcie_port_read(struct mt7621_pcie_port *port, u32 reg)
-{
- return readl_relaxed(port->base + reg);
-}
-
-static inline void pcie_port_write(struct mt7621_pcie_port *port,
- u32 val, u32 reg)
-{
- writel_relaxed(val, port->base + reg);
-}
-
-static inline u32 mt7621_pci_get_cfgaddr(unsigned int bus, unsigned int slot,
- unsigned int func, unsigned int where)
-{
- return (((where & 0xF00) >> 8) << 24) | (bus << 16) | (slot << 11) |
- (func << 8) | (where & 0xfc) | 0x80000000;
-}
-
-static void __iomem *mt7621_pcie_map_bus(struct pci_bus *bus,
- unsigned int devfn, int where)
-{
- struct mt7621_pcie *pcie = bus->sysdata;
- u32 address = mt7621_pci_get_cfgaddr(bus->number, PCI_SLOT(devfn),
- PCI_FUNC(devfn), where);
-
- writel_relaxed(address, pcie->base + RALINK_PCI_CONFIG_ADDR);
-
- return pcie->base + RALINK_PCI_CONFIG_DATA + (where & 3);
-}
-
-struct pci_ops mt7621_pci_ops = {
- .map_bus = mt7621_pcie_map_bus,
- .read = pci_generic_config_read,
- .write = pci_generic_config_write,
-};
-
-static u32 read_config(struct mt7621_pcie *pcie, unsigned int dev, u32 reg)
-{
- u32 address = mt7621_pci_get_cfgaddr(0, dev, 0, reg);
-
- pcie_write(pcie, address, RALINK_PCI_CONFIG_ADDR);
- return pcie_read(pcie, RALINK_PCI_CONFIG_DATA);
-}
-
-static void write_config(struct mt7621_pcie *pcie, unsigned int dev,
- u32 reg, u32 val)
-{
- u32 address = mt7621_pci_get_cfgaddr(0, dev, 0, reg);
-
- pcie_write(pcie, address, RALINK_PCI_CONFIG_ADDR);
- pcie_write(pcie, val, RALINK_PCI_CONFIG_DATA);
-}
-
-static inline void mt7621_rst_gpio_pcie_assert(struct mt7621_pcie_port *port)
-{
- if (port->gpio_rst)
- gpiod_set_value(port->gpio_rst, 1);
-}
-
-static inline void mt7621_rst_gpio_pcie_deassert(struct mt7621_pcie_port *port)
-{
- if (port->gpio_rst)
- gpiod_set_value(port->gpio_rst, 0);
-}
-
-static inline bool mt7621_pcie_port_is_linkup(struct mt7621_pcie_port *port)
-{
- return (pcie_port_read(port, RALINK_PCI_STATUS) & PCIE_PORT_LINKUP) != 0;
-}
-
-static inline void mt7621_control_assert(struct mt7621_pcie_port *port)
-{
- struct mt7621_pcie *pcie = port->pcie;
-
- if (pcie->resets_inverted)
- reset_control_assert(port->pcie_rst);
- else
- reset_control_deassert(port->pcie_rst);
-}
-
-static inline void mt7621_control_deassert(struct mt7621_pcie_port *port)
-{
- struct mt7621_pcie *pcie = port->pcie;
-
- if (pcie->resets_inverted)
- reset_control_deassert(port->pcie_rst);
- else
- reset_control_assert(port->pcie_rst);
-}
-
-static int setup_cm_memory_region(struct pci_host_bridge *host)
-{
- struct mt7621_pcie *pcie = pci_host_bridge_priv(host);
- struct device *dev = pcie->dev;
- struct resource_entry *entry;
- resource_size_t mask;
-
- entry = resource_list_first_type(&host->windows, IORESOURCE_MEM);
- if (!entry) {
- dev_err(dev, "Cannot get memory resource\n");
- return -EINVAL;
- }
-
- if (mips_cps_numiocu(0)) {
- /*
- * FIXME: hardware doesn't accept mask values with 1s after
- * 0s (e.g. 0xffef), so it would be great to warn if that's
- * about to happen
- */
- mask = ~(entry->res->end - entry->res->start);
-
- write_gcr_reg1_base(entry->res->start);
- write_gcr_reg1_mask(mask | CM_GCR_REGn_MASK_CMTGT_IOCU0);
- dev_info(dev, "PCI coherence region base: 0x%08llx, mask/settings: 0x%08llx\n",
- (unsigned long long)read_gcr_reg1_base(),
- (unsigned long long)read_gcr_reg1_mask());
- }
-
- return 0;
-}
-
-static int mt7621_pcie_parse_port(struct mt7621_pcie *pcie,
- struct device_node *node,
- int slot)
-{
- struct mt7621_pcie_port *port;
- struct device *dev = pcie->dev;
- struct platform_device *pdev = to_platform_device(dev);
- char name[10];
- int err;
-
- port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
- if (!port)
- return -ENOMEM;
-
- port->base = devm_platform_ioremap_resource(pdev, slot + 1);
- if (IS_ERR(port->base))
- return PTR_ERR(port->base);
-
- port->clk = devm_get_clk_from_child(dev, node, NULL);
- if (IS_ERR(port->clk)) {
- dev_err(dev, "failed to get pcie%d clock\n", slot);
- return PTR_ERR(port->clk);
- }
-
- port->pcie_rst = of_reset_control_get_exclusive(node, NULL);
- if (PTR_ERR(port->pcie_rst) == -EPROBE_DEFER) {
- dev_err(dev, "failed to get pcie%d reset control\n", slot);
- return PTR_ERR(port->pcie_rst);
- }
-
- snprintf(name, sizeof(name), "pcie-phy%d", slot);
- port->phy = devm_of_phy_get(dev, node, name);
- if (IS_ERR(port->phy)) {
- dev_err(dev, "failed to get pcie-phy%d\n", slot);
- err = PTR_ERR(port->phy);
- goto remove_reset;
- }
-
- port->gpio_rst = devm_gpiod_get_index_optional(dev, "reset", slot,
- GPIOD_OUT_LOW);
- if (IS_ERR(port->gpio_rst)) {
- dev_err(dev, "Failed to get GPIO for PCIe%d\n", slot);
- err = PTR_ERR(port->gpio_rst);
- goto remove_reset;
- }
-
- port->slot = slot;
- port->pcie = pcie;
-
- INIT_LIST_HEAD(&port->list);
- list_add_tail(&port->list, &pcie->ports);
-
- return 0;
-
-remove_reset:
- reset_control_put(port->pcie_rst);
- return err;
-}
-
-static int mt7621_pcie_parse_dt(struct mt7621_pcie *pcie)
-{
- struct device *dev = pcie->dev;
- struct platform_device *pdev = to_platform_device(dev);
- struct device_node *node = dev->of_node, *child;
- int err;
-
- pcie->base = devm_platform_ioremap_resource(pdev, 0);
- if (IS_ERR(pcie->base))
- return PTR_ERR(pcie->base);
-
- for_each_available_child_of_node(node, child) {
- int slot;
-
- err = of_pci_get_devfn(child);
- if (err < 0) {
- of_node_put(child);
- dev_err(dev, "failed to parse devfn: %d\n", err);
- return err;
- }
-
- slot = PCI_SLOT(err);
-
- err = mt7621_pcie_parse_port(pcie, child, slot);
- if (err) {
- of_node_put(child);
- return err;
- }
- }
-
- return 0;
-}
-
-static int mt7621_pcie_init_port(struct mt7621_pcie_port *port)
-{
- struct mt7621_pcie *pcie = port->pcie;
- struct device *dev = pcie->dev;
- u32 slot = port->slot;
- int err;
-
- err = phy_init(port->phy);
- if (err) {
- dev_err(dev, "failed to initialize port%d phy\n", slot);
- return err;
- }
-
- err = phy_power_on(port->phy);
- if (err) {
- dev_err(dev, "failed to power on port%d phy\n", slot);
- phy_exit(port->phy);
- return err;
- }
-
- port->enabled = true;
-
- return 0;
-}
-
-static void mt7621_pcie_reset_assert(struct mt7621_pcie *pcie)
-{
- struct mt7621_pcie_port *port;
-
- list_for_each_entry(port, &pcie->ports, list) {
- /* PCIe RC reset assert */
- mt7621_control_assert(port);
-
- /* PCIe EP reset assert */
- mt7621_rst_gpio_pcie_assert(port);
- }
-
- msleep(PERST_DELAY_MS);
-}
-
-static void mt7621_pcie_reset_rc_deassert(struct mt7621_pcie *pcie)
-{
- struct mt7621_pcie_port *port;
-
- list_for_each_entry(port, &pcie->ports, list)
- mt7621_control_deassert(port);
-}
-
-static void mt7621_pcie_reset_ep_deassert(struct mt7621_pcie *pcie)
-{
- struct mt7621_pcie_port *port;
-
- list_for_each_entry(port, &pcie->ports, list)
- mt7621_rst_gpio_pcie_deassert(port);
-
- msleep(PERST_DELAY_MS);
-}
-
-static int mt7621_pcie_init_ports(struct mt7621_pcie *pcie)
-{
- struct device *dev = pcie->dev;
- struct mt7621_pcie_port *port, *tmp;
- u8 num_disabled = 0;
- int err;
-
- mt7621_pcie_reset_assert(pcie);
- mt7621_pcie_reset_rc_deassert(pcie);
-
- list_for_each_entry_safe(port, tmp, &pcie->ports, list) {
- u32 slot = port->slot;
-
- if (slot == 1) {
- port->enabled = true;
- continue;
- }
-
- err = mt7621_pcie_init_port(port);
- if (err) {
- dev_err(dev, "Initiating port %d failed\n", slot);
- list_del(&port->list);
- }
- }
-
- mt7621_pcie_reset_ep_deassert(pcie);
-
- tmp = NULL;
- list_for_each_entry(port, &pcie->ports, list) {
- u32 slot = port->slot;
-
- if (!mt7621_pcie_port_is_linkup(port)) {
- dev_err(dev, "pcie%d no card, disable it (RST & CLK)\n",
- slot);
- mt7621_control_assert(port);
- port->enabled = false;
- num_disabled++;
-
- if (slot == 0) {
- tmp = port;
- continue;
- }
-
- if (slot == 1 && tmp && !tmp->enabled)
- phy_power_off(tmp->phy);
- }
- }
-
- return (num_disabled != PCIE_PORT_CNT) ? 0 : -ENODEV;
-}
-
-static void mt7621_pcie_enable_port(struct mt7621_pcie_port *port)
-{
- struct mt7621_pcie *pcie = port->pcie;
- u32 slot = port->slot;
- u32 val;
-
- /* enable pcie interrupt */
- val = pcie_read(pcie, RALINK_PCI_PCIMSK_ADDR);
- val |= PCIE_PORT_INT_EN(slot);
- pcie_write(pcie, val, RALINK_PCI_PCIMSK_ADDR);
-
- /* map 2G DDR region */
- pcie_port_write(port, PCIE_BAR_MAP_MAX | PCIE_BAR_ENABLE,
- PCI_BASE_ADDRESS_0);
-
- /* configure class code and revision ID */
- pcie_port_write(port, PCIE_CLASS_CODE | PCIE_REVISION_ID,
- RALINK_PCI_CLASS);
-
- /* configure RC FTS number to 250 when it leaves L0s */
- val = read_config(pcie, slot, PCIE_FTS_NUM);
- val &= ~PCIE_FTS_NUM_MASK;
- val |= PCIE_FTS_NUM_L0(0x50);
- write_config(pcie, slot, PCIE_FTS_NUM, val);
-}
-
-static int mt7621_pcie_enable_ports(struct pci_host_bridge *host)
-{
- struct mt7621_pcie *pcie = pci_host_bridge_priv(host);
- struct device *dev = pcie->dev;
- struct mt7621_pcie_port *port;
- struct resource_entry *entry;
- int err;
-
- entry = resource_list_first_type(&host->windows, IORESOURCE_IO);
- if (!entry) {
- dev_err(dev, "Cannot get io resource\n");
- return -EINVAL;
- }
-
- /* Setup MEMWIN and IOWIN */
- pcie_write(pcie, 0xffffffff, RALINK_PCI_MEMBASE);
- pcie_write(pcie, entry->res->start, RALINK_PCI_IOBASE);
-
- list_for_each_entry(port, &pcie->ports, list) {
- if (port->enabled) {
- err = clk_prepare_enable(port->clk);
- if (err) {
- dev_err(dev, "enabling clk pcie%d\n",
- port->slot);
- return err;
- }
-
- mt7621_pcie_enable_port(port);
- dev_info(dev, "PCIE%d enabled\n", port->slot);
- }
- }
-
- return 0;
-}
-
-static int mt7621_pcie_register_host(struct pci_host_bridge *host)
-{
- struct mt7621_pcie *pcie = pci_host_bridge_priv(host);
-
- host->ops = &mt7621_pci_ops;
- host->sysdata = pcie;
- return pci_host_probe(host);
-}
-
-static const struct soc_device_attribute mt7621_pci_quirks_match[] = {
- { .soc_id = "mt7621", .revision = "E2" }
-};
-
-static int mt7621_pci_probe(struct platform_device *pdev)
-{
- struct device *dev = &pdev->dev;
- const struct soc_device_attribute *attr;
- struct mt7621_pcie_port *port;
- struct mt7621_pcie *pcie;
- struct pci_host_bridge *bridge;
- int err;
-
- if (!dev->of_node)
- return -ENODEV;
-
- bridge = devm_pci_alloc_host_bridge(dev, sizeof(*pcie));
- if (!bridge)
- return -ENOMEM;
-
- pcie = pci_host_bridge_priv(bridge);
- pcie->dev = dev;
- platform_set_drvdata(pdev, pcie);
- INIT_LIST_HEAD(&pcie->ports);
-
- attr = soc_device_match(mt7621_pci_quirks_match);
- if (attr)
- pcie->resets_inverted = true;
-
- err = mt7621_pcie_parse_dt(pcie);
- if (err) {
- dev_err(dev, "Parsing DT failed\n");
- return err;
- }
-
- err = mt7621_pcie_init_ports(pcie);
- if (err) {
- dev_err(dev, "Nothing connected in virtual bridges\n");
- return 0;
- }
-
- err = mt7621_pcie_enable_ports(bridge);
- if (err) {
- dev_err(dev, "Error enabling pcie ports\n");
- goto remove_resets;
- }
-
- err = setup_cm_memory_region(bridge);
- if (err) {
- dev_err(dev, "Error setting up iocu mem regions\n");
- goto remove_resets;
- }
-
- return mt7621_pcie_register_host(bridge);
-
-remove_resets:
- list_for_each_entry(port, &pcie->ports, list)
- reset_control_put(port->pcie_rst);
-
- return err;
-}
-
-static int mt7621_pci_remove(struct platform_device *pdev)
-{
- struct mt7621_pcie *pcie = platform_get_drvdata(pdev);
- struct mt7621_pcie_port *port;
-
- list_for_each_entry(port, &pcie->ports, list)
- reset_control_put(port->pcie_rst);
-
- return 0;
-}
-
-static const struct of_device_id mt7621_pci_ids[] = {
- { .compatible = "mediatek,mt7621-pci" },
- {},
-};
-MODULE_DEVICE_TABLE(of, mt7621_pci_ids);
-
-static struct platform_driver mt7621_pci_driver = {
- .probe = mt7621_pci_probe,
- .remove = mt7621_pci_remove,
- .driver = {
- .name = "mt7621-pci",
- .of_match_table = of_match_ptr(mt7621_pci_ids),
- },
-};
-builtin_platform_driver(mt7621_pci_driver);
projects / mirror_ubuntu-kernels.git / commitdiff