450 lines
12 KiB
Diff
450 lines
12 KiB
Diff
From 307b7a71a634ae3848fb7c5c05759d647e140e12 Mon Sep 17 00:00:00 2001
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From: John Crispin <blogic@openwrt.org>
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Date: Sat, 18 May 2013 22:06:15 +0200
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Subject: [PATCH 32/57] PCI: MIPS: adds mt7620a pcie driver
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Signed-off-by: John Crispin <blogic@openwrt.org>
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---
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arch/mips/pci/Makefile | 1 +
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arch/mips/pci/pci-mt7620.c | 363 +++++++++++++++++++++++++++++++++++++++++++
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arch/mips/ralink/Kconfig | 1 +
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3 files changed, 365 insertions(+)
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create mode 100644 arch/mips/pci/pci-mt7620.c
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Index: linux-3.14.18/arch/mips/pci/Makefile
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===================================================================
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--- linux-3.14.18.orig/arch/mips/pci/Makefile 2014-11-13 15:45:37.323344081 +0100
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+++ linux-3.14.18/arch/mips/pci/Makefile 2014-11-13 15:45:37.331344390 +0100
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@@ -42,6 +42,7 @@
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obj-$(CONFIG_LANTIQ) += fixup-lantiq.o
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obj-$(CONFIG_PCI_LANTIQ) += pci-lantiq.o ops-lantiq.o
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obj-$(CONFIG_SOC_MT7621) += pci-mt7621.o
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+obj-$(CONFIG_SOC_MT7620) += pci-mt7620.o
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obj-$(CONFIG_SOC_RT2880) += pci-rt2880.o
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obj-$(CONFIG_SOC_RT3883) += pci-rt3883.o
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obj-$(CONFIG_TANBAC_TB0219) += fixup-tb0219.o
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Index: linux-3.14.18/arch/mips/pci/pci-mt7620.c
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===================================================================
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--- /dev/null 1970-01-01 00:00:00.000000000 +0000
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+++ linux-3.14.18/arch/mips/pci/pci-mt7620.c 2014-11-13 18:20:27.961225097 +0100
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@@ -0,0 +1,395 @@
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+/*
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+ * Ralink MT7620A SoC PCI support
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+ *
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+ * Copyright (C) 2007-2013 Bruce Chang
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+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
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+ *
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+ * This program is free software; you can redistribute it and/or modify it
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+ * under the terms of the GNU General Public License version 2 as published
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+ * by the Free Software Foundation.
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+ */
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+
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+#include <linux/types.h>
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+#include <linux/pci.h>
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+#include <linux/io.h>
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+#include <linux/init.h>
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+#include <linux/delay.h>
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+#include <linux/interrupt.h>
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+#include <linux/module.h>
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+#include <linux/of.h>
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+#include <linux/of_irq.h>
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+#include <linux/of_pci.h>
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+#include <linux/reset.h>
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+#include <linux/platform_device.h>
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+
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+#include <asm/mach-ralink/ralink_regs.h>
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+#include <asm/mach-ralink/mt7620.h>
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+
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+#define RALINK_PCI_MM_MAP_BASE 0x20000000
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+#define RALINK_PCI_IO_MAP_BASE 0x10160000
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+
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+#define RALINK_INT_PCIE0 4
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+#define RALINK_SYSCFG1 0x14
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+#define RALINK_CLKCFG1 0x30
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+#define RALINK_GPIOMODE 0x60
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+#define RALINK_PCIE_CLK_GEN 0x7c
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+#define RALINK_PCIE_CLK_GEN1 0x80
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+#define PCIEPHY0_CFG 0x90
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+#define PPLL_CFG1 0x9c
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+#define PPLL_DRV 0xa0
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+#define PDRV_SW_SET (1<<31)
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+#define LC_CKDRVPD_ (1<<19)
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+
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+#define RALINK_PCI_CONFIG_ADDR 0x20
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+#define RALINK_PCI_CONFIG_DATA_VIRT_REG 0x24
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+#define MEMORY_BASE 0x0
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+#define RALINK_PCIE0_RST (1<<26)
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+#define RALINK_PCI_BASE 0xB0140000
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+#define RALINK_PCI_MEMBASE 0x28
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+#define RALINK_PCI_IOBASE 0x2C
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+
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+#define RT6855_PCIE0_OFFSET 0x2000
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+
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+#define RALINK_PCI_PCICFG_ADDR 0x00
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+#define RALINK_PCI0_BAR0SETUP_ADDR 0x10
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+#define RALINK_PCI0_IMBASEBAR0_ADDR 0x18
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+#define RALINK_PCI0_ID 0x30
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+#define RALINK_PCI0_CLASS 0x34
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+#define RALINK_PCI0_SUBID 0x38
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+#define RALINK_PCI0_STATUS 0x50
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+#define RALINK_PCI_PCIMSK_ADDR 0x0C
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+
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+#define RALINK_PCIEPHY_P0_CTL_OFFSET 0x7498
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+#define RALINK_PCIE0_CLK_EN (1 << 26)
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+
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+#define BUSY 0x80000000
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+#define WAITRETRY_MAX 10
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+#define WRITE_MODE (1UL << 23)
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+#define DATA_SHIFT 0
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+#define ADDR_SHIFT 8
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+
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+static void __iomem *bridge_base;
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+static void __iomem *pcie_base;
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+
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+static struct reset_control *rstpcie0;
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+
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+static inline void bridge_w32(u32 val, unsigned reg)
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+{
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+ iowrite32(val, bridge_base + reg);
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+}
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+
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+static inline u32 bridge_r32(unsigned reg)
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+{
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+ return ioread32(bridge_base + reg);
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+}
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+
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+static inline void pcie_w32(u32 val, unsigned reg)
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+{
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+ iowrite32(val, pcie_base + reg);
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+}
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+
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+static inline u32 pcie_r32(unsigned reg)
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+{
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+ return ioread32(pcie_base + reg);
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+}
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+
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+static inline void pcie_m32(u32 clr, u32 set, unsigned reg)
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+{
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+ u32 val = pcie_r32(reg);
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+
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+ val &= ~clr;
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+ val |= set;
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+ pcie_w32(val, reg);
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+}
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+
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+static int wait_pciephy_busy(void)
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+{
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+ unsigned long reg_value = 0x0, retry = 0;
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+
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+ while (1) {
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+ reg_value = pcie_r32(PCIEPHY0_CFG);
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+
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+ if (reg_value & BUSY)
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+ mdelay(100);
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+ else
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+ break;
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+ if (retry++ > WAITRETRY_MAX){
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+ printk("PCIE-PHY retry failed.\n");
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+ return -1;
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+ }
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+ }
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+ return 0;
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+}
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+
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+static void pcie_phy(unsigned long addr, unsigned long val)
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+{
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+ wait_pciephy_busy();
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+ pcie_w32(WRITE_MODE | (val << DATA_SHIFT) | (addr << ADDR_SHIFT), PCIEPHY0_CFG);
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+ mdelay(1);
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+ wait_pciephy_busy();
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+}
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+
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+static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 * val)
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+{
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+ unsigned int slot = PCI_SLOT(devfn);
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+ u8 func = PCI_FUNC(devfn);
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+ u32 address;
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+ u32 data;
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+ u32 num = 0;
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+
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+ if (bus)
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+ num = bus->number;
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+
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+ address = (((where & 0xF00) >> 8) << 24) | (num << 16) | (slot << 11) | (func << 8) | (where & 0xfc) | 0x80000000;
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+ bridge_w32(address, RALINK_PCI_CONFIG_ADDR);
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+ data = bridge_r32(RALINK_PCI_CONFIG_DATA_VIRT_REG);
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+
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+ switch (size) {
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+ case 1:
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+ *val = (data >> ((where & 3) << 3)) & 0xff;
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+ break;
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+ case 2:
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+ *val = (data >> ((where & 3) << 3)) & 0xffff;
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+ break;
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+ case 4:
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+ *val = data;
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+ break;
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+ }
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+
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+ return PCIBIOS_SUCCESSFUL;
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+}
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+
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+static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val)
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+{
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+ unsigned int slot = PCI_SLOT(devfn);
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+ u8 func = PCI_FUNC(devfn);
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+ u32 address;
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+ u32 data;
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+ u32 num = 0;
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+
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+ if (bus)
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+ num = bus->number;
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+
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+ address = (((where & 0xF00) >> 8) << 24) | (num << 16) | (slot << 11) | (func << 8) | (where & 0xfc) | 0x80000000;
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+ bridge_w32(address, RALINK_PCI_CONFIG_ADDR);
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+ data = bridge_r32(RALINK_PCI_CONFIG_DATA_VIRT_REG);
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+
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+ switch (size) {
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+ case 1:
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+ data = (data & ~(0xff << ((where & 3) << 3))) |
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+ (val << ((where & 3) << 3));
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+ break;
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+ case 2:
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+ data = (data & ~(0xffff << ((where & 3) << 3))) |
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+ (val << ((where & 3) << 3));
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+ break;
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+ case 4:
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+ data = val;
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+ break;
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+ }
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+
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+ bridge_w32(data, RALINK_PCI_CONFIG_DATA_VIRT_REG);
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+
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+ return PCIBIOS_SUCCESSFUL;
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+}
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+
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+struct pci_ops mt7620_pci_ops= {
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+ .read = pci_config_read,
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+ .write = pci_config_write,
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+};
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+
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+static struct resource mt7620_res_pci_mem1;
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+static struct resource mt7620_res_pci_io1;
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+struct pci_controller mt7620_controller = {
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+ .pci_ops = &mt7620_pci_ops,
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+ .mem_resource = &mt7620_res_pci_mem1,
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+ .mem_offset = 0x00000000UL,
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+ .io_resource = &mt7620_res_pci_io1,
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+ .io_offset = 0x00000000UL,
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+ .io_map_base = 0xa0000000,
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+};
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+
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+static int mt7620_pci_hw_init(struct platform_device *pdev) {
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+ /* PCIE: bypass PCIe DLL */
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+ pcie_phy(0x0, 0x80);
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+ pcie_phy(0x1, 0x04);
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+
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+ /* PCIE: Elastic buffer control */
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+ pcie_phy(0x68, 0xB4);
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+
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+ reset_control_assert(rstpcie0);
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+
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+ rt_sysc_m32(RALINK_PCIE0_CLK_EN, 0, RALINK_CLKCFG1);
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+ rt_sysc_m32(BIT(19), BIT(31), PPLL_DRV);
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+ rt_sysc_m32(0x3 << 16, 0, RALINK_GPIOMODE);
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+
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+ reset_control_deassert(rstpcie0);
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+ rt_sysc_m32(0, RALINK_PCIE0_CLK_EN, RALINK_CLKCFG1);
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+
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+ mdelay(100);
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+
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+ if (!(rt_sysc_r32(PPLL_CFG1) & BIT(23))) {
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+ dev_err(&pdev->dev, "MT7620 PPLL unlock\n");
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+ reset_control_assert(rstpcie0);
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+ rt_sysc_m32(RALINK_PCIE0_CLK_EN, 0, RALINK_CLKCFG1);
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+ return -1;
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+ }
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+ rt_sysc_m32(BIT(18) | BIT(17), BIT(19) | BIT(31), PPLL_DRV);
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+
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+ return 0;
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+}
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+
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+static int mt7628_pci_hw_init(struct platform_device *pdev) {
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+ u32 val = 0;
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+
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+ rt_sysc_m32(BIT(16), 0, RALINK_GPIOMODE);
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+ reset_control_deassert(rstpcie0);
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+ rt_sysc_m32(0, RALINK_PCIE0_CLK_EN, RALINK_CLKCFG1);
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+ mdelay(100);
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+
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+ pcie_m32(~0xff, 0x5, RALINK_PCIEPHY_P0_CTL_OFFSET);
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+
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+ pci_config_read(NULL, 0, 0x70c, 4, &val);
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+ val &= ~(0xff) << 8;
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+ val |= 0x50 << 8;
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+ pci_config_write(NULL, 0, 0x70c, 4, val);
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+
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+ pci_config_read(NULL, 0, 0x70c, 4, &val);
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+ dev_err(&pdev->dev, "Port 0 N_FTS = %x\n", (unsigned int) val);
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+
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+ return 0;
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+}
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+
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+static int mt7620_pci_probe(struct platform_device *pdev)
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+{
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+ struct resource *bridge_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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+ struct resource *pcie_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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+ u32 val = 0;
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+
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+ rstpcie0 = devm_reset_control_get(&pdev->dev, "pcie0");
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+ if (IS_ERR(rstpcie0))
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+ return PTR_ERR(rstpcie0);
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+
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+ bridge_base = devm_request_and_ioremap(&pdev->dev, bridge_res);
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+ if (!bridge_base)
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+ return -ENOMEM;
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+
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+ pcie_base = devm_request_and_ioremap(&pdev->dev, pcie_res);
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+ if (!pcie_base)
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+ return -ENOMEM;
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+
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+ iomem_resource.start = 0;
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+ iomem_resource.end = ~0;
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+ ioport_resource.start = 0;
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+ ioport_resource.end = ~0;
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+
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+ /* bring up the pci core */
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+ switch (ralink_soc) {
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+ case MT762X_SOC_MT7620A:
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+ if (mt7620_pci_hw_init(pdev))
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+ return -1;
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+ break;
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+
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+ case MT762X_SOC_MT7628AN:
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+ if (mt7628_pci_hw_init(pdev))
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+ return -1;
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+ break;
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+
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+ default:
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+ dev_err(&pdev->dev, "pcie is not supported on this hardware\n");
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+ return -1;
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+ }
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+ mdelay(50);
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+
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+ /* enable write access */
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+ pcie_m32(BIT(1), 0, RALINK_PCI_PCICFG_ADDR);
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+ mdelay(100);
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+
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+ /* check if there is a card present */
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+ if ((pcie_r32(RALINK_PCI0_STATUS) & 0x1) == 0) {
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+ reset_control_assert(rstpcie0);
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+ rt_sysc_m32(RALINK_PCIE0_CLK_EN, 0, RALINK_CLKCFG1);
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+ if (ralink_soc == MT762X_SOC_MT7620A)
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+ rt_sysc_m32(LC_CKDRVPD_, PDRV_SW_SET, PPLL_DRV);
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+ dev_err(&pdev->dev, "PCIE0 no card, disable it(RST&CLK)\n");
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+ return -1;
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+ }
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+
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+ /* setup ranges */
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+ bridge_w32(0xffffffff, RALINK_PCI_MEMBASE);
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+ bridge_w32(RALINK_PCI_IO_MAP_BASE, RALINK_PCI_IOBASE);
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+
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+ pcie_w32(0x7FFF0001, RALINK_PCI0_BAR0SETUP_ADDR);
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+ pcie_w32(MEMORY_BASE, RALINK_PCI0_IMBASEBAR0_ADDR);
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+ pcie_w32(0x06040001, RALINK_PCI0_CLASS);
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+
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+ /* enable interrupts */
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+ pcie_m32(0, BIT(20), RALINK_PCI_PCIMSK_ADDR);
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+
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+ /* voodoo from the SDK driver */
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+ pci_config_read(NULL, 0, 4, 4, &val);
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+ pci_config_write(NULL, 0, 4, 4, val | 0x7);
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+
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+ pci_load_of_ranges(&mt7620_controller, pdev->dev.of_node);
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+ register_pci_controller(&mt7620_controller);
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+
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+ return 0;
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+}
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+
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+int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
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+{
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+ u16 cmd;
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+ u32 val;
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+ int irq = 0;
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+
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+ if ((dev->bus->number == 0) && (slot == 0)) {
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+ pcie_w32(0x7FFF0001, RALINK_PCI0_BAR0SETUP_ADDR); //open 7FFF:2G; ENABLE
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+ pci_config_write(dev->bus, 0, PCI_BASE_ADDRESS_0, 4, MEMORY_BASE);
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+ pci_config_read(dev->bus, 0, PCI_BASE_ADDRESS_0, 4, &val);
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+ } else if ((dev->bus->number == 1) && (slot == 0x0)) {
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+ irq = RALINK_INT_PCIE0;
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+ } else {
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+ dev_err(&dev->dev, "no irq found - bus=0x%x, slot = 0x%x\n", dev->bus->number, slot);
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+ return 0;
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+ }
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+ dev_err(&dev->dev, "card - bus=0x%x, slot = 0x%x irq=%d\n", dev->bus->number, slot, irq);
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+
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+ pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 0x14); //configure cache line size 0x14
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+ pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0xFF); //configure latency timer 0x10
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+ pci_read_config_word(dev, PCI_COMMAND, &cmd);
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+
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+ // FIXME
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+ cmd = cmd | PCI_COMMAND_MASTER | PCI_COMMAND_IO | PCI_COMMAND_MEMORY;
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+ pci_write_config_word(dev, PCI_COMMAND, cmd);
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+ pci_write_config_byte(dev, PCI_INTERRUPT_LINE, dev->irq);
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+ //pci_write_config_byte(dev, PCI_INTERRUPT_PIN, dev->irq);
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+
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+ return irq;
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+}
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+
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+int pcibios_plat_dev_init(struct pci_dev *dev)
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+{
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+ return 0;
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+}
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+
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+static const struct of_device_id mt7620_pci_ids[] = {
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+ { .compatible = "mediatek,mt7620-pci" },
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+ {},
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+};
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+MODULE_DEVICE_TABLE(of, mt7620_pci_ids);
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+
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+static struct platform_driver mt7620_pci_driver = {
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+ .probe = mt7620_pci_probe,
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+ .driver = {
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+ .name = "mt7620-pci",
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+ .owner = THIS_MODULE,
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+ .of_match_table = of_match_ptr(mt7620_pci_ids),
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+ },
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+};
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+
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+static int __init mt7620_pci_init(void)
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+{
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+ return platform_driver_register(&mt7620_pci_driver);
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+}
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+
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+arch_initcall(mt7620_pci_init);
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Index: linux-3.14.18/arch/mips/ralink/Kconfig
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===================================================================
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--- linux-3.14.18.orig/arch/mips/ralink/Kconfig 2014-11-13 15:45:37.323344081 +0100
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+++ linux-3.14.18/arch/mips/ralink/Kconfig 2014-11-13 15:45:37.331344390 +0100
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@@ -39,6 +39,7 @@
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bool "MT7620/8"
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select USB_ARCH_HAS_OHCI
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select USB_ARCH_HAS_EHCI
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+ select HW_HAS_PCI
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config SOC_MT7621
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bool "MT7621"
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Index: linux-3.14.18/arch/mips/include/asm/mach-ralink/mt7620.h
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===================================================================
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--- linux-3.14.18.orig/arch/mips/include/asm/mach-ralink/mt7620.h 2014-11-13 15:45:37.311343619 +0100
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+++ linux-3.14.18/arch/mips/include/asm/mach-ralink/mt7620.h 2014-11-13 18:20:31.721370073 +0100
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@@ -19,6 +19,7 @@
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MT762X_SOC_MT7620N,
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MT762X_SOC_MT7628AN,
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};
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+extern enum mt762x_soc_type mt762x_soc;
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#define MT7620_SYSC_BASE 0x10000000
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