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wifipineapple-openwrt/target/linux/ramips/patches-3.10/0115-PCI-MIPS-adds-mt7620a-...

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From 686f5642c74323f7e7eafb93c2b85df589cbf66e Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Sat, 18 May 2013 22:06:15 +0200
Subject: [PATCH 115/133] PCI: MIPS: adds mt7620a pcie driver
Signed-off-by: John Crispin <blogic@openwrt.org>
---
arch/mips/pci/Makefile | 1 +
arch/mips/pci/pci-mt7620a.c | 363 +++++++++++++++++++++++++++++++++++++++++++
arch/mips/ralink/Kconfig | 1 +
3 files changed, 365 insertions(+)
create mode 100644 arch/mips/pci/pci-mt7620a.c
--- a/arch/mips/pci/Makefile
+++ b/arch/mips/pci/Makefile
@@ -41,6 +41,7 @@ obj-$(CONFIG_SIBYTE_BCM1x80) += pci-bcm1
obj-$(CONFIG_SNI_RM) += fixup-sni.o ops-sni.o
obj-$(CONFIG_LANTIQ) += fixup-lantiq.o
obj-$(CONFIG_PCI_LANTIQ) += pci-lantiq.o ops-lantiq.o
+obj-$(CONFIG_SOC_MT7620) += pci-mt7620a.o
obj-$(CONFIG_SOC_RT2880) += pci-rt2880.o
obj-$(CONFIG_SOC_RT3883) += pci-rt3883.o
obj-$(CONFIG_TANBAC_TB0219) += fixup-tb0219.o
--- /dev/null
+++ b/arch/mips/pci/pci-mt7620a.c
@@ -0,0 +1,363 @@
+/*
+ * Ralink MT7620A SoC PCI support
+ *
+ * Copyright (C) 2007-2013 Bruce Chang
+ * Copyright (C) 2013 John Crispin <blogic@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/types.h>
+#include <linux/pci.h>
+#include <linux/io.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_pci.h>
+#include <linux/reset.h>
+#include <linux/platform_device.h>
+
+#include <asm/mach-ralink/ralink_regs.h>
+
+#define RALINK_PCI_MM_MAP_BASE 0x20000000
+#define RALINK_PCI_IO_MAP_BASE 0x10160000
+
+#define RALINK_INT_PCIE0 4
+#define RALINK_SYSTEM_CONTROL_BASE 0xb0000000
+#define RALINK_SYSCFG1 0x14
+#define RALINK_CLKCFG1 0x30
+#define RALINK_GPIOMODE 0x60
+#define RALINK_PCIE_CLK_GEN 0x7c
+#define RALINK_PCIE_CLK_GEN1 0x80
+#define PCIEPHY0_CFG 0x90
+#define PPLL_CFG1 0x9c
+#define PPLL_DRV 0xa0
+#define RALINK_PCI_HOST_MODE_EN (1<<7)
+#define RALINK_PCIE_RC_MODE_EN (1<<8)
+#define RALINK_PCIE_RST (1<<23)
+#define RALINK_PCI_RST (1<<24)
+#define RALINK_PCI_CLK_EN (1<<19)
+#define RALINK_PCIE_CLK_EN (1<<21)
+#define PCI_SLOTx2 (1<<11)
+#define PCI_SLOTx1 (2<<11)
+#define PDRV_SW_SET (1<<31)
+#define LC_CKDRVPD_ (1<<19)
+
+#define RALINK_PCI_CONFIG_ADDR 0x20
+#define RALINK_PCI_CONFIG_DATA_VIRTUAL_REG 0x24
+#define MEMORY_BASE 0x0
+#define RALINK_PCIE0_RST (1<<26)
+#define RALINK_PCI_BASE 0xB0140000
+#define RALINK_PCI_MEMBASE 0x28
+#define RALINK_PCI_IOBASE 0x2C
+
+#define RT6855_PCIE0_OFFSET 0x2000
+
+#define RALINK_PCI_PCICFG_ADDR 0x00
+#define RALINK_PCI0_BAR0SETUP_ADDR 0x10
+#define RALINK_PCI0_IMBASEBAR0_ADDR 0x18
+#define RALINK_PCI0_ID 0x30
+#define RALINK_PCI0_CLASS 0x34
+#define RALINK_PCI0_SUBID 0x38
+#define RALINK_PCI0_STATUS 0x50
+#define RALINK_PCI_PCIMSK_ADDR 0x0C
+
+#define RALINK_PCIE0_CLK_EN (1 << 26)
+
+#define BUSY 0x80000000
+#define WAITRETRY_MAX 10
+#define WRITE_MODE (1UL << 23)
+#define DATA_SHIFT 0
+#define ADDR_SHIFT 8
+
+
+static void __iomem *bridge_base;
+static void __iomem *pcie_base;
+
+static struct reset_control *rstpcie0;
+
+static inline void bridge_w32(u32 val, unsigned reg)
+{
+ iowrite32(val, bridge_base + reg);
+}
+
+static inline u32 bridge_r32(unsigned reg)
+{
+ return ioread32(bridge_base + reg);
+}
+
+static inline void pcie_w32(u32 val, unsigned reg)
+{
+ iowrite32(val, pcie_base + reg);
+}
+
+static inline u32 pcie_r32(unsigned reg)
+{
+ return ioread32(pcie_base + reg);
+}
+
+static inline void pcie_m32(u32 clr, u32 set, unsigned reg)
+{
+ u32 val = pcie_r32(reg);
+ val &= ~clr;
+ val |= set;
+ pcie_w32(val, reg);
+}
+
+int wait_pciephy_busy(void)
+{
+ unsigned long reg_value = 0x0, retry = 0;
+
+ while (1) {
+ //reg_value = rareg(READMODE, PCIEPHY0_CFG, 0);
+ reg_value = pcie_r32(PCIEPHY0_CFG);
+
+ if (reg_value & BUSY)
+ mdelay(100);
+ else
+ break;
+ if (retry++ > WAITRETRY_MAX){
+ printk("PCIE-PHY retry failed.\n");
+ return -1;
+ }
+ }
+ return 0;
+}
+
+static void pcie_phy(unsigned long addr, unsigned long val)
+{
+ wait_pciephy_busy();
+ pcie_w32(WRITE_MODE | (val << DATA_SHIFT) | (addr << ADDR_SHIFT), PCIEPHY0_CFG);
+ mdelay(1);
+ wait_pciephy_busy();
+}
+
+static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 * val)
+{
+ unsigned int slot = PCI_SLOT(devfn);
+ u8 func = PCI_FUNC(devfn);
+ u32 address;
+ u32 data;
+
+ address = (((where & 0xF00) >> 8) << 24) | (bus->number << 16) | (slot << 11) | (func << 8) | (where & 0xfc) | 0x80000000;
+ bridge_w32(address, RALINK_PCI_CONFIG_ADDR);
+ data = bridge_r32(RALINK_PCI_CONFIG_DATA_VIRTUAL_REG);
+
+ 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 pci_config_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val)
+{
+ unsigned int slot = PCI_SLOT(devfn);
+ u8 func = PCI_FUNC(devfn);
+ u32 address;
+ u32 data;
+
+ address = (((where & 0xF00) >> 8) << 24) | (bus->number << 16) | (slot << 11) | (func << 8) | (where & 0xfc) | 0x80000000;
+ bridge_w32(address, RALINK_PCI_CONFIG_ADDR);
+ data = bridge_r32(RALINK_PCI_CONFIG_DATA_VIRTUAL_REG);
+
+ 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;
+ }
+
+ bridge_w32(data, RALINK_PCI_CONFIG_DATA_VIRTUAL_REG);
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+struct pci_ops mt7620a_pci_ops= {
+ .read = pci_config_read,
+ .write = pci_config_write,
+};
+
+static struct resource mt7620a_res_pci_mem1 = {
+ .name = "pci memory",
+ .start = RALINK_PCI_MM_MAP_BASE,
+ .end = (u32) ((RALINK_PCI_MM_MAP_BASE + (unsigned char *)0x0fffffff)),
+ .flags = IORESOURCE_MEM,
+};
+static struct resource mt7620a_res_pci_io1 = {
+ .name = "pci io",
+ .start = RALINK_PCI_IO_MAP_BASE,
+ .end = (u32) ((RALINK_PCI_IO_MAP_BASE + (unsigned char *)0x0ffff)),
+ .flags = IORESOURCE_IO,
+};
+
+struct pci_controller mt7620a_controller = {
+ .pci_ops = &mt7620a_pci_ops,
+ .mem_resource = &mt7620a_res_pci_mem1,
+ .io_resource = &mt7620a_res_pci_io1,
+ .mem_offset = 0x00000000UL,
+ .io_offset = 0x00000000UL,
+ .io_map_base = 0xa0000000,
+};
+
+static int mt7620a_pci_probe(struct platform_device *pdev)
+{
+ struct resource *bridge_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ struct resource *pcie_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+
+ rstpcie0 = devm_reset_control_get(&pdev->dev, "pcie0");
+ if (IS_ERR(rstpcie0))
+ return PTR_ERR(rstpcie0);
+
+ bridge_base = devm_request_and_ioremap(&pdev->dev, bridge_res);
+ if (!bridge_base)
+ return -ENOMEM;
+
+ pcie_base = devm_request_and_ioremap(&pdev->dev, pcie_res);
+ if (!pcie_base)
+ return -ENOMEM;
+
+ iomem_resource.start = 0;
+ iomem_resource.end= ~0;
+ ioport_resource.start= 0;
+ ioport_resource.end = ~0;
+
+ /* PCIE: bypass PCIe DLL */
+ pcie_phy(0x0, 0x80);
+ pcie_phy(0x1, 0x04);
+ /* PCIE: Elastic buffer control */
+ pcie_phy(0x68, 0xB4);
+
+ reset_control_assert(rstpcie0);
+ rt_sysc_m32(RALINK_PCIE0_CLK_EN, 0, RALINK_CLKCFG1);
+ rt_sysc_m32(1<<19, 1<<31, PPLL_DRV);
+ rt_sysc_m32(0x3 << 16, 0, RALINK_GPIOMODE);
+
+ reset_control_deassert(rstpcie0);
+ rt_sysc_m32(0, RALINK_PCIE0_CLK_EN, RALINK_CLKCFG1);
+
+ mdelay(100);
+
+ if (!(rt_sysc_r32(PPLL_CFG1) & 1<<23)) {
+ printk("MT7620 PPLL unlock\n");
+ reset_control_assert(rstpcie0);
+ rt_sysc_m32(BIT(26), 0, RALINK_CLKCFG1);
+ return 0;
+ }
+ rt_sysc_m32((0x1<<18) | (0x1<<17), (0x1 << 19) | (0x1 << 31), PPLL_DRV);
+
+ mdelay(100);
+ reset_control_assert(rstpcie0);
+ rt_sysc_m32(0x30, 2 << 4, RALINK_SYSCFG1);
+
+ rt_sysc_m32(~0x7fffffff, 0x80000000, RALINK_PCIE_CLK_GEN);
+ rt_sysc_m32(~0x80ffffff, 0xa << 24, RALINK_PCIE_CLK_GEN1);
+
+ mdelay(50);
+ reset_control_deassert(rstpcie0);
+ pcie_m32(BIT(1), 0, RALINK_PCI_PCICFG_ADDR);
+ mdelay(100);
+
+ if (( pcie_r32(RALINK_PCI0_STATUS) & 0x1) == 0) {
+ reset_control_assert(rstpcie0);
+ rt_sysc_m32(RALINK_PCIE0_CLK_EN, 0, RALINK_CLKCFG1);
+ rt_sysc_m32(LC_CKDRVPD_, PDRV_SW_SET, PPLL_DRV);
+ printk("PCIE0 no card, disable it(RST&CLK)\n");
+ }
+
+ bridge_w32(0xffffffff, RALINK_PCI_MEMBASE);
+ bridge_w32(RALINK_PCI_IO_MAP_BASE, RALINK_PCI_IOBASE);
+
+ pcie_w32(0x7FFF0000, RALINK_PCI0_BAR0SETUP_ADDR);
+ pcie_w32(MEMORY_BASE, RALINK_PCI0_IMBASEBAR0_ADDR);
+ pcie_w32(0x08021814, RALINK_PCI0_ID);
+ pcie_w32(0x06040001, RALINK_PCI0_CLASS);
+ pcie_w32(0x28801814, RALINK_PCI0_SUBID);
+ pcie_m32(0, BIT(20), RALINK_PCI_PCIMSK_ADDR);
+
+ register_pci_controller(&mt7620a_controller);
+
+ return 0;
+}
+
+int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+ const struct resource *res;
+ u16 cmd;
+ u32 val;
+ int i, irq = 0;
+
+ if ((dev->bus->number == 0) && (slot == 0)) {
+ pcie_w32(0x7FFF0001, RALINK_PCI0_BAR0SETUP_ADDR); //open 7FFF:2G; ENABLE
+ pci_config_write(dev->bus, 0, PCI_BASE_ADDRESS_0, 4, MEMORY_BASE);
+ pci_config_read(dev->bus, 0, PCI_BASE_ADDRESS_0, 4, &val);
+ } else if ((dev->bus->number == 1) && (slot == 0x0)) {
+ irq = RALINK_INT_PCIE0;
+ } else {
+ printk("bus=0x%x, slot = 0x%x\n", dev->bus->number, slot);
+ return 0;
+ }
+
+ for (i = 0; i < 6; i++) {
+ res = &dev->resource[i];
+ }
+
+ pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 0x14); //configure cache line size 0x14
+ pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0xFF); //configure latency timer 0x10
+ pci_read_config_word(dev, PCI_COMMAND, &cmd);
+
+ // FIXME
+ cmd = cmd | PCI_COMMAND_MASTER | PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
+ pci_write_config_word(dev, PCI_COMMAND, cmd);
+ pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
+ //pci_write_config_byte(dev, PCI_INTERRUPT_PIN, dev->irq);
+
+ return irq;
+}
+
+int pcibios_plat_dev_init(struct pci_dev *dev)
+{
+ return 0;
+}
+
+static const struct of_device_id mt7620a_pci_ids[] = {
+ { .compatible = "ralink,mt7620a-pci" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, mt7620a_pci_ids);
+
+static struct platform_driver mt7620a_pci_driver = {
+ .probe = mt7620a_pci_probe,
+ .driver = {
+ .name = "mt7620a-pci",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(mt7620a_pci_ids),
+ },
+};
+
+static int __init mt7620a_pci_init(void)
+{
+ return platform_driver_register(&mt7620a_pci_driver);
+}
+
+arch_initcall(mt7620a_pci_init);
--- a/arch/mips/ralink/Kconfig
+++ b/arch/mips/ralink/Kconfig
@@ -33,6 +33,7 @@ choice
bool "MT7620"
select USB_ARCH_HAS_OHCI
select USB_ARCH_HAS_EHCI
+ select HW_HAS_PCI
endchoice
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