[PATCH 2/2] PCI: mediatek: add support for PCIE found on MT7623/MT2701
John Crispin
blogic at openwrt.org
Thu Jan 7 13:06:13 PST 2016
Add PCIE controller support on MediaTek MT2701/MT7623. The driver supports
a single Root complex (RC) with 3 Root Ports. The SoCs supports a Gen2
1-lan Link on each port.
Signed-off-by: John Crispin <blogic at openwrt.org>
---
arch/arm/mach-mediatek/Kconfig | 1 +
drivers/pci/host/Kconfig | 11 +
drivers/pci/host/Makefile | 1 +
drivers/pci/host/pcie-mediatek.c | 604 ++++++++++++++++++++++++++++++++++++++
4 files changed, 617 insertions(+)
create mode 100644 drivers/pci/host/pcie-mediatek.c
diff --git a/arch/arm/mach-mediatek/Kconfig b/arch/arm/mach-mediatek/Kconfig
index 7fb605e..a7fef77 100644
--- a/arch/arm/mach-mediatek/Kconfig
+++ b/arch/arm/mach-mediatek/Kconfig
@@ -24,6 +24,7 @@ config MACH_MT6592
config MACH_MT7623
bool "MediaTek MT7623 SoCs support"
default ARCH_MEDIATEK
+ select MIGHT_HAVE_PCI
config MACH_MT8127
bool "MediaTek MT8127 SoCs support"
diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
index f131ba9..912f0e1 100644
--- a/drivers/pci/host/Kconfig
+++ b/drivers/pci/host/Kconfig
@@ -172,4 +172,15 @@ config PCI_HISI
help
Say Y here if you want PCIe controller support on HiSilicon HIP05 SoC
+config PCIE_MTK
+ bool "Mediatek PCIe Controller"
+ depends on MACH_MT2701 || MACH_MT7623
+ depends on OF
+ depends on PCI
+ help
+ Say Y here if you want to enable PCI controller support on Mediatek MT7623.
+ MT7623 PCIe supports single Root complex (RC) with 3 Root Ports.
+ Each port supports a Gen2 1-lan Link.
+ PCIe include one Host/PCI bridge and 3 PCIe MAC.
+
endmenu
diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
index 9d4d3c6..3b53374 100644
--- a/drivers/pci/host/Makefile
+++ b/drivers/pci/host/Makefile
@@ -20,3 +20,4 @@ obj-$(CONFIG_PCIE_IPROC_BCMA) += pcie-iproc-bcma.o
obj-$(CONFIG_PCIE_ALTERA) += pcie-altera.o
obj-$(CONFIG_PCIE_ALTERA_MSI) += pcie-altera-msi.o
obj-$(CONFIG_PCI_HISI) += pcie-hisi.o
+obj-$(CONFIG_PCIE_MTK) += pcie-mediatek.o
diff --git a/drivers/pci/host/pcie-mediatek.c b/drivers/pci/host/pcie-mediatek.c
new file mode 100644
index 0000000..6bd283a
--- /dev/null
+++ b/drivers/pci/host/pcie-mediatek.c
@@ -0,0 +1,604 @@
+/*
+ * Mediatek MT2701/MT7623 SoC PCIE support
+ *
+ * Copyright (C) 2015 Mediatek
+ * Copyright (C) 2015 Ziv Huang <ziv.huang at mediatek.com>
+ * Copyright (C) 2015 John Crispin <blogic at openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <asm/irq.h>
+#include <asm/mach/pci.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/of_irq.h>
+#include <linux/reset.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/pm_runtime.h>
+#include <linux/clk.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+
+#define MEMORY_BASE 0x80000000
+
+/* PCIE Registers */
+#define PCICFG 0x00
+#define PCIINT 0x08
+#define PCIENA 0x0c
+#define CFGADDR 0x20
+#define CFGDATA 0x24
+#define MEMBASE 0x28
+#define IOBASE 0x2c
+
+/* per Port Registers */
+#define BAR0SETUP 0x10
+#define IMBASEBAR0 0x18
+#define PCIE_CLASS 0x34
+#define PCIE_SISTAT 0x50
+
+#define MTK_PCIE_HIGH_PERF BIT(14)
+#define PCIEP0_BASE 0x2000
+#define PCIEP1_BASE 0x3000
+#define PCIEP2_BASE 0x4000
+
+#define PHY_P0_CTL 0x9000
+#define PHY_P1_CTL 0xa000
+#define PHY_P2_CTL 0x4000
+
+#define RSTCTL_PCIE0_RST BIT(24)
+#define RSTCTL_PCIE1_RST BIT(25)
+#define RSTCTL_PCIE2_RST BIT(26)
+
+#define HIFSYS_SYSCFG1 0x14
+#define HIFSYS_SYSCFG1_PHY2_MASK (0x3 << 20)
+
+static struct mtk_pcie_port {
+ int id;
+ int enable;
+ u32 base;
+ u32 perst_n;
+ u32 interrupt_en;
+ int irq;
+ u32 link;
+ void __iomem *phy_base;
+ struct reset_control *rstc;
+} mtk_pcie_port[] = {
+ { 0, 0, PCIEP0_BASE, BIT(1), BIT(20) },
+ { 1, 0, PCIEP1_BASE, BIT(2), BIT(21) },
+ { 2, 0, PCIEP2_BASE, BIT(3), BIT(22) },
+};
+#define MAX_PORT_NUM ARRAY_SIZE(mtk_pcie_port)
+#define mtk_foreach_port(p) \
+ for ((p) = mtk_pcie_port; \
+ (p) != &mtk_pcie_port[MAX_PORT_NUM]; (p)++)
+
+struct mtk_pcie {
+ struct device *dev;
+ void __iomem *pcie_base;
+ struct regmap *hifsys;
+
+ struct resource io;
+ struct resource pio;
+ struct resource mem;
+ struct resource prefetch;
+ struct resource busn;
+
+ u32 io_bus_addr;
+ u32 mem_bus_addr;
+
+ struct clk *clk;
+ int pcie_card_link;
+};
+
+static const struct mtk_phy_init {
+ uint32_t reg;
+ uint32_t mask;
+ uint32_t val;
+} mtk_phy_init[] = {
+ { 0xc00, 0x33000, 0x22000 },
+ { 0xb04, 0xe0000000, 0x40000000 },
+ { 0xb00, 0xe, 0x4 },
+ { 0xc3C, 0xffff0000, 0x3c0000 },
+ { 0xc48, 0xffff, 0x36 },
+ { 0xc0c, 0x30000000, 0x10000000 },
+ { 0xc08, 0x3800c0, 0xc0 },
+ { 0xc10, 0xf0000, 0x20000 },
+ { 0xc0c, 0xf000, 0x1000 },
+ { 0xc14, 0xf0000, 0xa0000 },
+};
+
+static struct mtk_pcie *sys_to_pcie(struct pci_sys_data *sys)
+{
+ return sys->private_data;
+}
+
+static void pcie_w32(struct mtk_pcie *pcie, u32 val, unsigned reg)
+{
+ iowrite32(val, pcie->pcie_base + reg);
+}
+
+static u32 pcie_r32(struct mtk_pcie *pcie, unsigned reg)
+{
+ return ioread32(pcie->pcie_base + reg);
+}
+
+static void pcie_m32(struct mtk_pcie *pcie, u32 mask, u32 val, unsigned reg)
+{
+ u32 v = pcie_r32(pcie, reg);
+
+ v &= mask;
+ v |= val;
+ pcie_w32(pcie, v, reg);
+}
+
+static int pcie_config_read(struct pci_bus *bus, unsigned int devfn, int where,
+ int size, u32 *val)
+{
+ struct mtk_pcie *pcie = sys_to_pcie(bus->sysdata);
+ unsigned int slot = PCI_SLOT(devfn);
+ u8 func = PCI_FUNC(devfn);
+ u32 address;
+ u32 data;
+ u32 num = 0;
+
+ if (bus)
+ num = bus->number;
+
+ address = (((where & 0xf00) >> 8) << 24) |
+ (num << 16) |
+ (slot << 11) |
+ (func << 8) |
+ (where & 0xfc);
+
+ pcie_m32(pcie, 0xf0000000, address, CFGADDR);
+ data = pcie_r32(pcie, CFGDATA);
+
+ switch (size) {
+ case 1:
+ *val = (data >> ((where & 3) << 3)) & 0xff;
+ break;
+ case 2:
+ *val = (data >> ((where & 3) << 3)) & 0xffff;
+ break;
+ case 4:
+ *val = data;
+ break;
+ }
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int pcie_config_write(struct pci_bus *bus, unsigned int devfn, int where,
+ int size, u32 val)
+{
+ struct mtk_pcie *pcie = sys_to_pcie(bus->sysdata);
+ unsigned int slot = PCI_SLOT(devfn);
+ u8 func = PCI_FUNC(devfn);
+ u32 address;
+ u32 data;
+ u32 num = 0;
+
+ if (bus)
+ num = bus->number;
+
+ address = (((where & 0xf00) >> 8) << 24) |
+ (num << 16) | (slot << 11) | (func << 8) | (where & 0xfc);
+ pcie_m32(pcie, 0xf0000000, address, CFGADDR);
+ data = pcie_r32(pcie, CFGDATA);
+
+ switch (size) {
+ case 1:
+ data = (data & ~(0xff << ((where & 3) << 3))) |
+ (val << ((where & 3) << 3));
+ break;
+ case 2:
+ data = (data & ~(0xffff << ((where & 3) << 3))) |
+ (val << ((where & 3) << 3));
+ break;
+ case 4:
+ data = val;
+ break;
+ }
+ pcie_w32(pcie, data, CFGDATA);
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops mtk_pcie_ops = {
+ .read = pcie_config_read,
+ .write = pcie_config_write,
+};
+
+static int __init mtk_pcie_setup(int nr, struct pci_sys_data *sys)
+{
+ struct mtk_pcie *pcie = sys_to_pcie(sys);
+
+ if (!pcie->pcie_card_link)
+ return -1;
+
+ request_resource(&ioport_resource, &pcie->pio);
+ request_resource(&iomem_resource, &pcie->mem);
+
+ pci_add_resource_offset(&sys->resources, &pcie->mem, sys->mem_offset);
+ pci_add_resource_offset(&sys->resources, &pcie->pio, sys->io_offset);
+ pci_add_resource(&sys->resources, &pcie->busn);
+
+ return 1;
+}
+
+static struct pci_bus * __init mtk_pcie_scan_bus(int nr,
+ struct pci_sys_data *sys)
+{
+ struct mtk_pcie *pcie = sys_to_pcie(sys);
+ struct pci_bus *bus;
+
+ if (!pcie->pcie_card_link)
+ return NULL;
+
+ bus = pci_create_root_bus(pcie->dev, sys->busnr, &mtk_pcie_ops, sys,
+ &sys->resources);
+ if (!bus)
+ return NULL;
+
+ pci_scan_child_bus(bus);
+
+ return bus;
+}
+
+static int __init mtk_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+ struct mtk_pcie *pcie = sys_to_pcie(dev->bus->sysdata);
+ struct mtk_pcie_port *port;
+ int irq = -1;
+
+ if (!pcie->pcie_card_link)
+ return irq;
+
+ mtk_foreach_port(port)
+ if (port->id == slot)
+ irq = port->irq;
+
+ return irq;
+}
+
+static void mtk_pcie_configure_phy(struct mtk_pcie *pcie,
+ struct mtk_pcie_port *port)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(mtk_phy_init); i++) {
+ void __iomem *phy_addr = port->phy_base + mtk_phy_init[i].reg;
+ u32 val = ioread32(phy_addr);
+
+ val &= ~mtk_phy_init[i].mask;
+ val |= mtk_phy_init[i].val;
+ iowrite32(val, phy_addr);
+ }
+ usleep_range(5000, 6000);
+}
+
+static void mtk_pcie_configure_rc(struct mtk_pcie *pcie,
+ struct mtk_pcie_port *port,
+ struct pci_bus *bus)
+{
+ u32 val = 0;
+
+ pcie_config_write(bus,
+ port->id << 3,
+ PCI_BASE_ADDRESS_0, 4, MEMORY_BASE);
+
+ pcie_config_read(bus,
+ port->id << 3, PCI_BASE_ADDRESS_0, 4, &val);
+
+ /* Configure RC Credit */
+ pcie_config_read(bus, port->id << 3, 0x73c, 4, &val);
+ val &= ~(0x9fff) << 16;
+ val |= 0x806c << 16;
+ pcie_config_write(bus, port->id << 3, 0x73c, 4, val);
+
+ /* Configure RC FTS number */
+ pcie_config_read(bus, port->id << 3, 0x70c, 4, &val);
+ val &= ~(0xff3) << 8;
+ val |= 0x50 << 8;
+ pcie_config_write(bus, port->id << 3, 0x70c, 4, val);
+}
+
+static void mtk_pcie_preinit(struct mtk_pcie *pcie)
+{
+ struct mtk_pcie_port *port;
+ u32 val = 0;
+ struct pci_bus bus;
+ struct pci_sys_data sys;
+
+ memset(&bus, 0, sizeof(bus));
+ memset(&sys, 0, sizeof(sys));
+ bus.sysdata = (void *)&sys;
+ sys.private_data = (void *)pcie;
+
+ pcibios_min_io = 0;
+ pcibios_min_mem = 0;
+
+ /* The PHY on Port 2 is shared with USB */
+ if (mtk_pcie_port[2].enable)
+ regmap_update_bits(pcie->hifsys, HIFSYS_SYSCFG1,
+ HIFSYS_SYSCFG1_PHY2_MASK, 0x0);
+
+ /* PCIe RC Reset */
+ mtk_foreach_port(port)
+ if (port->enable)
+ reset_control_assert(port->rstc);
+ usleep_range(1000, 2000);
+ mtk_foreach_port(port)
+ if (port->enable)
+ reset_control_deassert(port->rstc);
+ usleep_range(1000, 2000);
+
+ /* Configure PCIe PHY */
+ mtk_foreach_port(port)
+ if (port->enable)
+ mtk_pcie_configure_phy(pcie, port);
+
+ /* PCIe EP reset */
+ val = 0;
+ mtk_foreach_port(port)
+ if (port->enable)
+ val |= port->perst_n;
+ pcie_w32(pcie, pcie_r32(pcie, PCICFG) | val, PCICFG);
+ usleep_range(1000, 2000);
+ pcie_w32(pcie, pcie_r32(pcie, PCICFG) & ~val, PCICFG);
+ usleep_range(1000, 2000);
+ msleep(100);
+
+ /* check the link status */
+ val = 0;
+ mtk_foreach_port(port) {
+ if (port->enable) {
+ if ((pcie_r32(pcie, port->base + PCIE_SISTAT) & 0x1))
+ port->link = 1;
+ else
+ reset_control_assert(port->rstc);
+ }
+ }
+
+ mtk_foreach_port(port)
+ if (port->link)
+ pcie->pcie_card_link++;
+
+ if (!pcie->pcie_card_link)
+ return;
+
+ pcie_w32(pcie, pcie->mem_bus_addr, MEMBASE);
+ pcie_w32(pcie, pcie->io_bus_addr, IOBASE);
+
+ mtk_foreach_port(port) {
+ if (port->link) {
+ pcie_m32(pcie, 0, port->interrupt_en, PCIENA);
+ pcie_w32(pcie, 0x7fff0001, port->base + BAR0SETUP);
+ pcie_w32(pcie, MEMORY_BASE, port->base + IMBASEBAR0);
+ pcie_w32(pcie, 0x06040001, port->base + PCIE_CLASS);
+ }
+ }
+
+ mtk_foreach_port(port)
+ if (port->link)
+ mtk_pcie_configure_rc(pcie, port, &bus);
+}
+
+static int mtk_pcie_parse_dt(struct mtk_pcie *pcie)
+{
+ struct device_node *np = pcie->dev->of_node, *port;
+ struct of_pci_range_parser parser;
+ struct of_pci_range range;
+ struct resource res;
+ int err;
+
+ pcie->hifsys = syscon_regmap_lookup_by_phandle(np, "mediatek,hifsys");
+ if (IS_ERR(pcie->hifsys)) {
+ dev_err(pcie->dev, "missing \"mediatek,hifsys\" phandle\n");
+ return PTR_ERR(pcie->hifsys);
+ }
+
+ if (of_pci_range_parser_init(&parser, np)) {
+ dev_err(pcie->dev, "missing \"ranges\" property\n");
+ return -EINVAL;
+ }
+
+ for_each_of_pci_range(&parser, &range) {
+ err = of_pci_range_to_resource(&range, np, &res);
+ if (err < 0) {
+ dev_err(pcie->dev, "failed to read resource range\n");
+ return err;
+ }
+
+ switch (res.flags & IORESOURCE_TYPE_BITS) {
+ case IORESOURCE_IO:
+ memcpy(&pcie->pio, &res, sizeof(res));
+ pcie->pio.start = (resource_size_t)range.pci_addr;
+ pcie->pio.end = (resource_size_t)
+ (range.pci_addr + range.size - 1);
+ pcie->io_bus_addr = (resource_size_t)range.cpu_addr;
+ break;
+
+ case IORESOURCE_MEM:
+ if (res.flags & IORESOURCE_PREFETCH) {
+ memcpy(&pcie->prefetch, &res, sizeof(res));
+ pcie->prefetch.name = "prefetchable";
+ pcie->prefetch.start =
+ (resource_size_t)range.pci_addr;
+ pcie->prefetch.end = (resource_size_t)
+ (range.pci_addr + range.size - 1);
+ } else {
+ memcpy(&pcie->mem, &res, sizeof(res));
+ pcie->mem.name = "non-prefetchable";
+ pcie->mem.start = (resource_size_t)
+ range.pci_addr;
+ pcie->prefetch.end = (resource_size_t)
+ (range.pci_addr + range.size - 1);
+ pcie->mem_bus_addr = (resource_size_t)
+ range.cpu_addr;
+ }
+ break;
+ }
+ }
+
+ err = of_pci_parse_bus_range(np, &pcie->busn);
+ if (err < 0) {
+ dev_err(pcie->dev, "failed to parse ranges property: %d\n",
+ err);
+ pcie->busn.name = np->name;
+ pcie->busn.start = 0;
+ pcie->busn.end = 0xff;
+ pcie->busn.flags = IORESOURCE_BUS;
+ }
+
+ /* parse root ports */
+ for_each_child_of_node(np, port) {
+ unsigned int index;
+ char rst[] = "pcie0";
+
+ err = of_pci_get_devfn(port);
+ if (err < 0) {
+ dev_err(pcie->dev, "failed to parse address: %d\n",
+ err);
+ return err;
+ }
+
+ index = PCI_SLOT(err);
+
+ if (index > MAX_PORT_NUM) {
+ dev_err(pcie->dev, "invalid port number: %d\n", index);
+ continue;
+ }
+ index--;
+
+ if (!of_device_is_available(port))
+ continue;
+
+ rst[4] += index;
+ mtk_pcie_port[index].rstc = devm_reset_control_get(pcie->dev,
+ rst);
+ if (!IS_ERR(mtk_pcie_port[index].rstc))
+ mtk_pcie_port[index].enable = 1;
+ }
+ return 0;
+}
+
+static int mtk_pcie_get_resources(struct mtk_pcie *pcie)
+{
+ struct platform_device *pdev = to_platform_device(pcie->dev);
+ struct mtk_pcie_port *port;
+ struct resource *res;
+
+ pcie->clk = devm_clk_get(&pdev->dev, "pcie");
+ if (IS_ERR(pcie->clk)) {
+ dev_err(&pdev->dev, "Failed to get pcie clk\n");
+ return PTR_ERR(pcie->clk);
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ pcie->pcie_base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(pcie->pcie_base)) {
+ dev_err(&pdev->dev, "Failed to get pcie range\n");
+ return PTR_ERR(pcie->pcie_base);
+ }
+
+ mtk_foreach_port(port) {
+ if (!port->enable)
+ continue;
+ res = platform_get_resource(pdev, IORESOURCE_MEM, port->id + 1);
+ port->phy_base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(port->phy_base)) {
+ dev_err(&pdev->dev, "Failed to get pcie phy%d range\n",
+ port->id);
+ return PTR_ERR(port->phy_base);
+ }
+ port->irq = platform_get_irq(pdev, port->id);
+ }
+
+ return clk_prepare_enable(pcie->clk);
+}
+
+static int mtk_pcie_probe(struct platform_device *pdev)
+{
+ struct mtk_pcie *pcie;
+ struct hw_pci hw;
+ int ret;
+
+ pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL);
+ if (!pcie)
+ return -ENOMEM;
+
+ pcie->dev = &pdev->dev;
+ ret = mtk_pcie_parse_dt(pcie);
+ if (ret < 0)
+ return ret;
+
+ pm_runtime_enable(&pdev->dev);
+ pm_runtime_get_sync(&pdev->dev);
+
+ ret = mtk_pcie_get_resources(pcie);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "failed to request resources: %d\n", ret);
+ goto err_out;
+ }
+
+ mtk_pcie_preinit(pcie);
+
+ memset(&hw, 0, sizeof(hw));
+ hw.nr_controllers = 1;
+ hw.private_data = (void **)&pcie;
+ hw.setup = mtk_pcie_setup;
+ hw.map_irq = mtk_pcie_map_irq;
+ hw.scan = mtk_pcie_scan_bus;
+
+ pci_common_init_dev(pcie->dev, &hw);
+ platform_set_drvdata(pdev, pcie);
+
+ return 0;
+
+err_out:
+ clk_disable_unprepare(pcie->clk);
+ pm_runtime_put_sync(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+
+ return ret;
+}
+
+static const struct of_device_id mtk_pcie_ids[] = {
+ { .compatible = "mediatek,mt2701-pcie" },
+ { .compatible = "mediatek,mt7623-pcie" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, mtk_pcie_ids);
+
+static struct platform_driver mtk_pcie_driver = {
+ .probe = mtk_pcie_probe,
+ .driver = {
+ .name = "mediatek-pcie",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(mtk_pcie_ids),
+ },
+};
+
+static int __init mtk_pcie_init(void)
+{
+ return platform_driver_register(&mtk_pcie_driver);
+}
+
+module_init(mtk_pcie_init);
--
1.7.10.4
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