[U-Boot] [PATCH 3/4] pci: mediatek: Add pci-driver for mt2701

[Frank Wunderlich <frank-w@public-files.de>]

From: Oleksandr Rybalko <ray@ddteam.net>

this chip is used in MT7623 and some other Mediatek SoCs for pcie

Tested-by: Frank Wunderlich <frank-w@public-files.de>
Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Signed-off-by: Oleksandr Rybalko <ray@ddteam.net>
---
 drivers/pci/Kconfig      |   6 +
 drivers/pci/Makefile     |   1 +
 drivers/pci/pci-mt2701.c | 490 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 497 insertions(+)
 create mode 100644 drivers/pci/pci-mt2701.c

diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index 3fe38f7315..cfe8ba5e52 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -145,4 +145,10 @@ config PCI_MVEBU
 	  Say Y here if you want to enable PCIe controller support on
 	  Armada XP/38x SoCs.

+config PCIE_MT2701
+	bool "Mediatek 2701 PCI-E"
+	help
+	  Say Y here if you want to enable PCIe controller support on
+	  Mediatek MT7623
+
 endif
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index b5ebd50c85..a4c4002b9c 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -38,3 +38,4 @@ obj-$(CONFIG_PCIE_LAYERSCAPE_GEN4) += pcie_layerscape_gen4.o \
 				pcie_layerscape_gen4_fixup.o
 obj-$(CONFIG_PCI_XILINX) += pcie_xilinx.o
 obj-$(CONFIG_PCIE_INTEL_FPGA) += pcie_intel_fpga.o
+obj-$(CONFIG_PCIE_MT2701) += pci-mt2701.o
diff --git a/drivers/pci/pci-mt2701.c b/drivers/pci/pci-mt2701.c
new file mode 100644
index 0000000000..5904f15330
--- /dev/null
+++ b/drivers/pci/pci-mt2701.c
@@ -0,0 +1,490 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  Mediatek MT7623 SoC PCIE support
+ *
+ *  Copyright (C) 2015 Mediatek
+ *  Copyright (C) 2015 John Crispin <blogic@openwrt.org>
+ *  Copyright (C) 2015 Ziv Huang <ziv.huang@mediatek.com>
+ *  Copyright (C) 2019 Oleksandr Rybalko <ray@ddteam.net>
+ */
+
+#include <common.h>
+#include <malloc.h>
+
+#include <pci.h>
+#include <asm/io.h>
+
+#include <dm.h>
+#include <fdtdec.h>
+#include <linux/libfdt.h>
+#include <dm/lists.h>
+
+#define iowrite32(v, a)	writel(v, a)
+#define iowrite16(v, a)	writew(v, a)
+#define iowrite8(v, a)	writeb(v, a)
+#define ioread32(a)	readl(a)
+#define ioread16(a)	readw(a)
+#define ioread8(a)	readb(a)
+
+#define RT_HIFSYS_BASE		0x1a000000
+#define RT_PCIE_BASE		0x1a140000
+#define RT_PCIE_IOWIN_BASE	0x1a160000
+#define RT_PCIE_IOWIN_SIZE	0x00010000
+#define RT_PCIE_MEMWIN_BASE	0x60000000
+#define RT_PCIE_MEMWIN_SIZE	0x10000000
+
+#define RD(x)		readl(RT_PCIE_BASE | (x))
+#define WR(x, v)	writel(v, RT_PCIE_BASE | (x))
+
+#define SYSCFG1			0x14
+#define RSTCTL			0x34
+#define RSTSTAT			0x38
+#define PCICFG			0x00
+#define PCIINT			0x08
+#define PCIENA			0x0c
+#define CFGADDR			0x20
+#define CFGDATA			0x24
+#define MEMBASE			0x28
+#define IOBASE			0x2c
+
+#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 /* in USB space */
+
+#define RSTCTL_PCIE0_RST	BIT(24)
+#define RSTCTL_PCIE1_RST	BIT(25)
+#define RSTCTL_PCIE2_RST	BIT(26)
+#define MAX_PORT_NUM		3
+
+struct resource {
+	char *name;
+	u32 start;
+	u32 end;
+};
+
+struct mt_pcie {
+	char name[16];
+};
+
+static struct mtk_pcie_port {
+	int id;
+	int enable;
+	u32 base;
+	u32 phy_base;
+	u32 perst_n;
+	u32 reset;
+	u32 interrupt_en;
+	int irq;
+	u32 link;
+} mtk_pcie_port[] = {
+	{ 0, 1, PCIEP0_BASE, PHY_P0_CTL, BIT(1), RSTCTL_PCIE0_RST, BIT(20) },
+	{ 1, 1, PCIEP1_BASE, PHY_P1_CTL, BIT(2), RSTCTL_PCIE1_RST, BIT(21) },
+	{ 2, 0, PCIEP2_BASE, PHY_P2_CTL, BIT(3), RSTCTL_PCIE2_RST, BIT(22) },
+};
+
+struct mtk_pcie {
+	struct device *dev;
+	void __iomem *sys_base;		/* HIF SYSCTL registers */
+	void __iomem *pcie_base;	/* PCIE registers */
+	void __iomem *usb_base;		/* USB registers */
+
+	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 {
+	u32 reg;
+	u32 mask;
+	u32 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 },
+	{ 0xa28, 0x3fe00, 0x2000 },
+	{ 0xa2c, 0x1ff, 0x10 },
+};
+
+/*
+ * Globals.
+ */
+
+struct mtk_pcie pcie;
+struct mtk_pcie *pcie0;
+
+static int mtk_pcie_probe(void);
+static int mt_pcie_read_config(struct udevice *, pci_dev_t, uint, ulong *,
+			       enum pci_size_t);
+static int mt_pcie_write_config(struct udevice *, pci_dev_t, uint, ulong,
+				enum pci_size_t);
+
+#define mtk_foreach_port(p)		\
+		for ((p) = mtk_pcie_port;	\
+		(p) != &mtk_pcie_port[ARRAY_SIZE(mtk_pcie_port)]; (p)++)
+#define BITS(m, n)   (~(BIT(m) - 1) & ((BIT(n) - 1) | BIT(n)))
+
+static void
+mt7623_pcie_pinmux_set(void)
+{
+	u32 regValue;
+
+	/* Pin208: PCIE0_PERST_N (3) */
+	regValue = le32_to_cpu(ioread32(0x100059f0));
+	regValue &= ~(BITS(9, 11));
+	regValue |= 3 << 9;
+	iowrite32(regValue, 0x100059f0);
+
+	/* Pin208: PCIE1_PERST_N (3) */
+	regValue = le32_to_cpu(ioread32(0x100059f0));
+	regValue &= ~(BITS(12, 14));
+	regValue |= 3 << 12;
+	iowrite32(regValue, 0x100059f0);
+}
+
+static void
+sys_w32(struct mtk_pcie *pcie, u32 val, unsigned int reg)
+{
+	iowrite32(val, pcie->sys_base + reg);
+}
+
+static u32
+sys_r32(struct mtk_pcie *pcie, unsigned int reg)
+{
+	return ioread32(pcie->sys_base + reg);
+}
+
+static void
+pcie_w32(struct mtk_pcie *pcie, u32 val, unsigned int reg)
+{
+	iowrite32(val, pcie->pcie_base + reg);
+}
+
+static void
+pcie_w16(struct mtk_pcie *pcie, u16 val, unsigned int reg)
+{
+	iowrite16(val, pcie->pcie_base + reg);
+}
+
+static void
+pcie_w8(struct mtk_pcie *pcie, u8 val, unsigned int reg)
+{
+	iowrite8(val, pcie->pcie_base + reg);
+}
+
+static u32
+pcie_r32(struct mtk_pcie *pcie, unsigned int reg)
+{
+	return ioread32(pcie->pcie_base + reg);
+}
+
+static u32
+pcie_r16(struct mtk_pcie *pcie, unsigned int reg)
+{
+	return ioread16(pcie->pcie_base + reg);
+}
+
+static u32
+pcie_r8(struct mtk_pcie *pcie, unsigned int reg)
+{
+	return ioread8(pcie->pcie_base + reg);
+}
+
+static void
+pcie_m32(struct mtk_pcie *pcie, u32 mask, u32 val, unsigned int reg)
+{
+	u32 v;
+
+	v = pcie_r32(pcie, reg);
+	v &= mask;
+	v |= val;
+	pcie_w32(pcie, v, reg);
+}
+
+static void
+mtk_pcie_configure_phy(struct mtk_pcie_port *port)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(mtk_phy_init); i++) {
+		void __iomem *phy_addr = (void __iomem *)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);
+		udelay(100);
+	}
+	mdelay(16);
+}
+
+static void
+mtk_pcie_configure_rc(struct mtk_pcie *pcie, struct mtk_pcie_port *port)
+{
+	ulong val = 0;
+
+	mt_pcie_write_config(NULL, (port->id) << 3, PCI_BASE_ADDRESS_0,
+			     0x80000000, PCI_SIZE_32);
+	mt_pcie_read_config(NULL, (port->id) << 3, PCI_BASE_ADDRESS_0, &val,
+			    PCI_SIZE_32);
+
+	/* Configre RC Credit */
+	val = 0;
+	mt_pcie_read_config(NULL, (port->id) << 3, 0x73c, &val, PCI_SIZE_32);
+	val &= ~(0x9fffUL) << 16;
+	val |= 0x806c << 16;
+	mt_pcie_write_config(NULL, (port->id) << 3, 0x73c, val, PCI_SIZE_32);
+	mt_pcie_read_config(NULL, (port->id) << 3, 0x73c, &val, PCI_SIZE_32);
+
+	/* Configre RC FTS number */
+	mt_pcie_read_config(NULL, (port->id) << 3, 0x70c, &val, PCI_SIZE_32);
+	val &= ~(0xff3) << 8;
+	val |= 0x50 << 8;
+	mt_pcie_write_config(NULL, (port->id) << 3, 0x70c, val, PCI_SIZE_32);
+	mt_pcie_read_config(NULL, (port->id) << 3, 0x70c, &val, PCI_SIZE_32);
+}
+
+static void
+mtk_pcie_preinit(struct mtk_pcie *pcie)
+{
+	struct mtk_pcie_port *port;
+	u32 val = 0;
+	int i;
+
+	mt7623_pcie_pinmux_set();
+
+	/* PCIe RC Reset */
+	val = 0;
+	mtk_foreach_port(port)
+		if (port->enable)
+			val |= port->reset;
+	sys_w32(pcie, sys_r32(pcie, RSTCTL) | val, RSTCTL);
+	mdelay(12);
+	sys_w32(pcie, sys_r32(pcie, RSTCTL) & ~val, RSTCTL);
+	mdelay(12);
+
+	i = 100000;
+	while (i--) {
+		if (sys_r32(pcie, RSTSTAT) == 0)
+			break;
+		udelay(10);
+	}
+
+	/* Configure PCIe PHY */
+
+	mtk_foreach_port(port)
+		if (port->enable)
+			mtk_pcie_configure_phy(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);
+	mdelay(12);
+	pcie_w32(pcie, pcie_r32(pcie, PCICFG) & ~val, PCICFG);
+	mdelay(200);
+
+	/* 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
+				val |= port->reset;
+		}
+	}
+	sys_w32(pcie, sys_r32(pcie, RSTCTL) | val, RSTCTL);
+	mdelay(200);
+
+	i = 100000;
+	while (i--) {
+		if (sys_r32(pcie, RSTSTAT) == 0)
+			break;
+		udelay(10);
+	}
+
+	mtk_foreach_port(port) {
+		if (port->link)
+			pcie->pcie_card_link++;
+	}
+	printf("%s: PCIe Link count=%d\n", __func__, 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, 0xffffffff, port->interrupt_en, PCIENA);
+			pcie_w32(pcie, 0x7fff0001, port->base + BAR0SETUP);
+			pcie_w32(pcie, 0x80000000, port->base + IMBASEBAR0);
+			pcie_w32(pcie, 0x06040001, port->base + PCIE_CLASS);
+		}
+	}
+	mdelay(100);
+
+	mtk_foreach_port(port)
+		if (port->link)
+			mtk_pcie_configure_rc(pcie, port);
+}
+
+static void
+mtk_pcie_fill_port(struct mtk_pcie *pcie)
+{
+	int i;
+
+	for (i = 0; i < 2; i++)
+		mtk_pcie_port[i].phy_base += (u32)pcie->pcie_base;
+
+	mtk_pcie_port[2].phy_base += (u32)pcie->usb_base;
+}
+
+void
+mt_pcie_init(void)
+{
+	/* Static instance of the controller. */
+	static struct pci_controller	pcc;
+	struct pci_controller		*hose = &pcc;
+
+	memset(&pcc, 0, sizeof(pcc));
+
+	/* PCI I/O space */
+	pci_set_region(&hose->regions[0], RT_PCIE_IOWIN_BASE,
+		       RT_PCIE_IOWIN_BASE, RT_PCIE_IOWIN_SIZE, PCI_REGION_IO);
+
+	/* PCI memory space */
+	pci_set_region(&hose->regions[1], RT_PCIE_MEMWIN_BASE,
+		       RT_PCIE_MEMWIN_BASE, RT_PCIE_MEMWIN_SIZE,
+		       PCI_REGION_MEM);
+
+	hose->region_count = 2;
+}
+
+int
+mtk_pcie_probe()
+{
+	pcie0 = &pcie;
+
+	pcie0->io_bus_addr = RT_PCIE_IOWIN_BASE;
+	pcie0->mem_bus_addr = RT_PCIE_MEMWIN_BASE;
+	pcie0->sys_base = (u32 *)RT_HIFSYS_BASE;
+	pcie0->pcie_base = (u32 *)RT_PCIE_BASE;
+
+	mtk_pcie_fill_port(pcie0);
+
+	mtk_pcie_preinit(pcie0);
+
+	return 0;
+}
+
+/* Probe function. */
+void
+pci_init_board(void)
+{
+	mtk_pcie_probe();
+	mt_pcie_init();
+}
+
+static int
+mt_pcie_read_config(struct udevice *bus, pci_dev_t bdf,
+		    uint offset, ulong *valuep,
+		    enum pci_size_t size)
+{
+	u32 address =  bdf | ((offset & 0xf00) << 16) | (offset & 0xfc);
+
+	pcie_m32(pcie0, 0xf0000000, address, CFGADDR);
+
+	switch (size) {
+	case PCI_SIZE_8:
+		*valuep = pcie_r8(pcie0, CFGDATA + (offset & 3));
+		break;
+	case PCI_SIZE_16:
+		*valuep = pcie_r16(pcie0, CFGDATA + (offset & 2));
+		break;
+	case PCI_SIZE_32:
+		*valuep = pcie_r32(pcie0, CFGDATA);
+		break;
+	}
+
+	return 0;
+}
+
+static int
+mt_pcie_write_config(struct udevice *bus, pci_dev_t bdf,
+		     uint offset, ulong value,
+		     enum pci_size_t size)
+{
+	u32 address =  bdf | ((offset & 0xf00) << 16) | (offset & 0xfc);
+
+	pcie_m32(pcie0, 0xf0000000, address, CFGADDR);
+
+	switch (size) {
+	case PCI_SIZE_8:
+		pcie_w8(pcie0, value, CFGDATA + (offset & 3));
+		break;
+	case PCI_SIZE_16:
+		pcie_w16(pcie0, value, CFGDATA + (offset & 2));
+		break;
+	case PCI_SIZE_32:
+	default:
+		pcie_w32(pcie0, value, CFGDATA);
+		break;
+	}
+	return 0;
+}
+
+static int
+mt_pcie_probe(struct udevice *dev)
+{
+	mtk_pcie_probe();
+	mt_pcie_init();
+	return 0;
+}
+
+static const struct dm_pci_ops mt_pcie_ops = {
+	.read_config	= mt_pcie_read_config,
+	.write_config	= mt_pcie_write_config,
+};
+
+static const struct udevice_id mt_pcie_ids[] = {
+	{ .compatible = "mediatek,mt7623-pcie" },
+	{ }
+};
+
+U_BOOT_DRIVER(pcie_mt2701) = {
+	.name = "pci_mt2701",
+	.id = UCLASS_PCI,
+	.of_match = mt_pcie_ids,
+	.ops = &mt_pcie_ops,
+	.probe	= mt_pcie_probe,
+	.priv_auto_alloc_size = sizeof(struct mt_pcie),
+};
--
2.17.1