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From f01830fcc57273bd9ec5f6733ab3d28adeb71955 Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Thu, 21 Mar 2013 17:34:08 +0100
Subject: [PATCH 119/121] PCI: MIPS: adds rt3883 pci support
Add support for the pcie found on the rt3883 SoC.
Signed-off-by: John Crispin <blogic@openwrt.org>
---
arch/mips/pci/Makefile | 1 +
arch/mips/pci/pci-rt3883.c | 487 ++++++++++++++++++++++++++++++++++++++++++++
arch/mips/ralink/Kconfig | 1 +
3 files changed, 489 insertions(+)
create mode 100644 arch/mips/pci/pci-rt3883.c
--- a/arch/mips/pci/Makefile
+++ b/arch/mips/pci/Makefile
@@ -43,6 +43,7 @@ obj-$(CONFIG_SNI_RM) += fixup-sni.o ops
obj-$(CONFIG_LANTIQ) += fixup-lantiq.o
obj-$(CONFIG_PCI_LANTIQ) += pci-lantiq.o ops-lantiq.o
obj-$(CONFIG_SOC_RT2880) += pci-rt2880.o
+obj-$(CONFIG_SOC_RT3883) += pci-rt3883.o
obj-$(CONFIG_TANBAC_TB0219) += fixup-tb0219.o
obj-$(CONFIG_TANBAC_TB0226) += fixup-tb0226.o
obj-$(CONFIG_TANBAC_TB0287) += fixup-tb0287.o
--- /dev/null
+++ b/arch/mips/pci/pci-rt3883.c
@@ -0,0 +1,487 @@
+/*
+ * Ralink RT3883 SoC PCI support
+ *
+ * Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * Parts of this file are based on Ralink's 2.6.21 BSP
+ *
+ * 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 <asm/mach-ralink/rt3883.h>
+#include <asm/mach-ralink/rt3883_regs.h>
+
+#define RT3883_MEMORY_BASE 0x00000000
+#define RT3883_MEMORY_SIZE 0x02000000
+
+#define RT3883_PCI_MEM_BASE 0x20000000
+#define RT3883_PCI_MEM_SIZE 0x10000000
+#define RT3883_PCI_IO_BASE 0x10160000
+#define RT3883_PCI_IO_SIZE 0x00010000
+
+#define RT3883_PCI_REG_PCICFG_ADDR 0x00
+#define RT3883_PCI_REG_PCIRAW_ADDR 0x04
+#define RT3883_PCI_REG_PCIINT_ADDR 0x08
+#define RT3883_PCI_REG_PCIMSK_ADDR 0x0c
+#define RT3833_PCI_PCIINT_PCIE BIT(20)
+#define RT3833_PCI_PCIINT_PCI1 BIT(19)
+#define RT3833_PCI_PCIINT_PCI0 BIT(18)
+
+#define RT3883_PCI_REG_CONFIG_ADDR 0x20
+#define RT3883_PCI_REG_CONFIG_DATA 0x24
+#define RT3883_PCI_REG_MEMBASE 0x28
+#define RT3883_PCI_REG_IOBASE 0x2c
+#define RT3883_PCI_REG_ARBCTL 0x80
+
+#define RT3883_PCI_REG_BASE(_x) (0x1000 + (_x) * 0x1000)
+#define RT3883_PCI_REG_BAR0SETUP_ADDR(_x) (RT3883_PCI_REG_BASE((_x)) + 0x10)
+#define RT3883_PCI_REG_IMBASEBAR0_ADDR(_x) (RT3883_PCI_REG_BASE((_x)) + 0x18)
+#define RT3883_PCI_REG_ID(_x) (RT3883_PCI_REG_BASE((_x)) + 0x30)
+#define RT3883_PCI_REG_CLASS(_x) (RT3883_PCI_REG_BASE((_x)) + 0x34)
+#define RT3883_PCI_REG_SUBID(_x) (RT3883_PCI_REG_BASE((_x)) + 0x38)
+#define RT3883_PCI_REG_STATUS(_x) (RT3883_PCI_REG_BASE((_x)) + 0x50)
+
+static int (*rt3883_pci_plat_dev_init)(struct pci_dev *dev);
+static void __iomem *rt3883_pci_base;
+static DEFINE_SPINLOCK(rt3883_pci_lock);
+
+static inline u32 rt3883_pci_rr(unsigned reg)
+{
+ return readl(rt3883_pci_base + reg);
+}
+
+static inline void rt3883_pci_wr(u32 val, unsigned reg)
+{
+ writel(val, rt3883_pci_base + reg);
+}
+
+static inline u32 rt3883_pci_get_cfgaddr(unsigned int bus, unsigned int slot,
+ unsigned int func, unsigned int where)
+{
+ return ((bus << 16) | (slot << 11) | (func << 8) | (where & 0xfc) |
+ 0x80000000);
+}
+
+static u32 rt3883_pci_read_u32(unsigned bus, unsigned slot,
+ unsigned func, unsigned reg)
+{
+ unsigned long flags;
+ u32 address;
+ u32 ret;
+
+ address = rt3883_pci_get_cfgaddr(bus, slot, func, reg);
+
+ spin_lock_irqsave(&rt3883_pci_lock, flags);
+ rt3883_pci_wr(address, RT3883_PCI_REG_CONFIG_ADDR);
+ ret = rt3883_pci_rr(RT3883_PCI_REG_CONFIG_DATA);
+ spin_unlock_irqrestore(&rt3883_pci_lock, flags);
+
+ return ret;
+}
+
+static void rt3883_pci_write_u32(unsigned bus, unsigned slot,
+ unsigned func, unsigned reg, u32 val)
+{
+ unsigned long flags;
+ u32 address;
+
+ address = rt3883_pci_get_cfgaddr(bus, slot, func, reg);
+
+ spin_lock_irqsave(&rt3883_pci_lock, flags);
+ rt3883_pci_wr(address, RT3883_PCI_REG_CONFIG_ADDR);
+ rt3883_pci_wr(val, RT3883_PCI_REG_CONFIG_DATA);
+ spin_unlock_irqrestore(&rt3883_pci_lock, flags);
+}
+
+static void rt3883_pci_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+ u32 pending;
+
+ pending = rt3883_pci_rr(RT3883_PCI_REG_PCIINT_ADDR) &
+ rt3883_pci_rr(RT3883_PCI_REG_PCIMSK_ADDR);
+
+ if (!pending) {
+ spurious_interrupt();
+ return;
+ }
+
+ if (pending & RT3833_PCI_PCIINT_PCI0)
+ generic_handle_irq(RT3883_PCI_IRQ_PCI0);
+
+ if (pending & RT3833_PCI_PCIINT_PCI1)
+ generic_handle_irq(RT3883_PCI_IRQ_PCI1);
+
+ if (pending & RT3833_PCI_PCIINT_PCIE)
+ generic_handle_irq(RT3883_PCI_IRQ_PCIE);
+}
+
+static void rt3883_pci_irq_unmask(struct irq_data *d)
+{
+ int irq = d->irq;
+ u32 mask;
+ u32 t;
+
+ switch (irq) {
+ case RT3883_PCI_IRQ_PCI0:
+ mask = RT3833_PCI_PCIINT_PCI0;
+ break;
+ case RT3883_PCI_IRQ_PCI1:
+ mask = RT3833_PCI_PCIINT_PCI1;
+ break;
+ case RT3883_PCI_IRQ_PCIE:
+ mask = RT3833_PCI_PCIINT_PCIE;
+ break;
+ default:
+ BUG();
+ }
+
+ t = rt3883_pci_rr(RT3883_PCI_REG_PCIMSK_ADDR);
+ rt3883_pci_wr(t | mask, RT3883_PCI_REG_PCIMSK_ADDR);
+ /* flush write */
+ rt3883_pci_rr(RT3883_PCI_REG_PCIMSK_ADDR);
+}
+
+static void rt3883_pci_irq_mask(struct irq_data *d)
+{
+ int irq = d->irq;
+ u32 mask;
+ u32 t;
+
+ switch (irq) {
+ case RT3883_PCI_IRQ_PCI0:
+ mask = RT3833_PCI_PCIINT_PCI0;
+ break;
+ case RT3883_PCI_IRQ_PCI1:
+ mask = RT3833_PCI_PCIINT_PCI1;
+ break;
+ case RT3883_PCI_IRQ_PCIE:
+ mask = RT3833_PCI_PCIINT_PCIE;
+ break;
+ default:
+ BUG();
+ }
+
+ t = rt3883_pci_rr(RT3883_PCI_REG_PCIMSK_ADDR);
+ rt3883_pci_wr(t & ~mask, RT3883_PCI_REG_PCIMSK_ADDR);
+ /* flush write */
+ rt3883_pci_rr(RT3883_PCI_REG_PCIMSK_ADDR);
+}
+
+static struct irq_chip rt3883_pci_irq_chip = {
+ .name = "RT3883 PCI",
+ .irq_mask = rt3883_pci_irq_mask,
+ .irq_unmask = rt3883_pci_irq_unmask,
+ .irq_mask_ack = rt3883_pci_irq_mask,
+};
+
+static void __init rt3883_pci_irq_init(void)
+{
+ int i;
+
+ /* disable all interrupts */
+ rt3883_pci_wr(0, RT3883_PCI_REG_PCIMSK_ADDR);
+
+ for (i = RT3883_PCI_IRQ_BASE;
+ i < RT3883_PCI_IRQ_BASE + RT3883_PCI_IRQ_COUNT; i++) {
+ irq_set_chip_and_handler(i, &rt3883_pci_irq_chip,
+ handle_level_irq);
+ }
+
+ irq_set_chained_handler(RT3883_CPU_IRQ_PCI, rt3883_pci_irq_handler);
+}
+
+static int rt3883_pci_config_read(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 *val)
+{
+ unsigned long flags;
+ u32 address;
+ u32 data;
+
+ address = rt3883_pci_get_cfgaddr(bus->number, PCI_SLOT(devfn),
+ PCI_FUNC(devfn), where);
+
+ spin_lock_irqsave(&rt3883_pci_lock, flags);
+ rt3883_pci_wr(address, RT3883_PCI_REG_CONFIG_ADDR);
+ data = rt3883_pci_rr(RT3883_PCI_REG_CONFIG_DATA);
+ spin_unlock_irqrestore(&rt3883_pci_lock, flags);
+
+ 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 rt3883_pci_config_write(struct pci_bus *bus, unsigned int devfn,
+ int where, int size, u32 val)
+{
+ unsigned long flags;
+ u32 address;
+ u32 data;
+
+ address = rt3883_pci_get_cfgaddr(bus->number, PCI_SLOT(devfn),
+ PCI_FUNC(devfn), where);
+
+ spin_lock_irqsave(&rt3883_pci_lock, flags);
+ rt3883_pci_wr(address, RT3883_PCI_REG_CONFIG_ADDR);
+ data = rt3883_pci_rr(RT3883_PCI_REG_CONFIG_DATA);
+
+ 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;
+ }
+
+ rt3883_pci_wr(data, RT3883_PCI_REG_CONFIG_DATA);
+ spin_unlock_irqrestore(&rt3883_pci_lock, flags);
+
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops rt3883_pci_ops = {
+ .read = rt3883_pci_config_read,
+ .write = rt3883_pci_config_write,
+};
+
+static struct resource rt3883_pci_mem_resource = {
+ .name = "PCI MEM space",
+ .start = RT3883_PCI_MEM_BASE,
+ .end = RT3883_PCI_MEM_BASE + RT3883_PCI_MEM_SIZE - 1,
+ .flags = IORESOURCE_MEM,
+};
+
+static struct resource rt3883_pci_io_resource = {
+ .name = "PCI IO space",
+ .start = RT3883_PCI_IO_BASE,
+ .end = RT3883_PCI_IO_BASE + RT3883_PCI_IO_SIZE - 1,
+ .flags = IORESOURCE_IO,
+};
+
+static struct pci_controller rt3883_pci_controller = {
+ .pci_ops = &rt3883_pci_ops,
+ .mem_resource = &rt3883_pci_mem_resource,
+ .io_resource = &rt3883_pci_io_resource,
+};
+
+static void rt3883_pci_preinit(unsigned mode)
+{
+ u32 syscfg1;
+ u32 rstctrl;
+ u32 clkcfg1;
+
+ if (mode & RT3883_PCI_MODE_PCIE) {
+ u32 val;
+
+ val = rt3883_sysc_rr(RT3883_SYSC_REG_SYSCFG1);
+ val &= ~(0x30);
+ val |= (2 << 4);
+ rt3883_sysc_wr(val, RT3883_SYSC_REG_SYSCFG1);
+
+ val = rt3883_sysc_rr(RT3883_SYSC_REG_PCIE_CLK_GEN0);
+ val &= ~BIT(31);
+ rt3883_sysc_wr(val, RT3883_SYSC_REG_PCIE_CLK_GEN0);
+
+ val = rt3883_sysc_rr(RT3883_SYSC_REG_PCIE_CLK_GEN1);
+ val &= 0x80ffffff;
+ rt3883_sysc_wr(val, RT3883_SYSC_REG_PCIE_CLK_GEN1);
+
+ val = rt3883_sysc_rr(RT3883_SYSC_REG_PCIE_CLK_GEN1);
+ val |= 0xa << 24;
+ rt3883_sysc_wr(val, RT3883_SYSC_REG_PCIE_CLK_GEN1);
+
+ val = rt3883_sysc_rr(RT3883_SYSC_REG_PCIE_CLK_GEN0);
+ val |= BIT(31);
+ rt3883_sysc_wr(val, RT3883_SYSC_REG_PCIE_CLK_GEN0);
+
+ msleep(50);
+ }
+
+ syscfg1 = rt3883_sysc_rr(RT3883_SYSC_REG_SYSCFG1);
+ syscfg1 &= ~(RT3883_SYSCFG1_PCIE_RC_MODE |
+ RT3883_SYSCFG1_PCI_HOST_MODE);
+
+ rstctrl = rt3883_sysc_rr(RT3883_SYSC_REG_RSTCTRL);
+ rstctrl |= (RT3883_RSTCTRL_PCI | RT3883_RSTCTRL_PCIE);
+
+ clkcfg1 = rt3883_sysc_rr(RT3883_SYSC_REG_CLKCFG1);
+ clkcfg1 &= ~(RT3883_CLKCFG1_PCI_CLK_EN |
+ RT3883_CLKCFG1_PCIE_CLK_EN);
+
+ if (mode & RT3883_PCI_MODE_PCI) {
+ syscfg1 |= RT3883_SYSCFG1_PCI_HOST_MODE;
+ clkcfg1 |= RT3883_CLKCFG1_PCI_CLK_EN;
+ rstctrl &= ~RT3883_RSTCTRL_PCI;
+ }
+ if (mode & RT3883_PCI_MODE_PCIE) {
+ syscfg1 |= RT3883_SYSCFG1_PCI_HOST_MODE |
+ RT3883_SYSCFG1_PCIE_RC_MODE;
+ clkcfg1 |= RT3883_CLKCFG1_PCIE_CLK_EN;
+ rstctrl &= ~RT3883_RSTCTRL_PCIE;
+ }
+
+ rt3883_sysc_wr(syscfg1, RT3883_SYSC_REG_SYSCFG1);
+ rt3883_sysc_wr(rstctrl, RT3883_SYSC_REG_RSTCTRL);
+ rt3883_sysc_wr(clkcfg1, RT3883_SYSC_REG_CLKCFG1);
+
+ msleep(500);
+}
+
+static int rt3883_pcie_ready(void)
+{
+ u32 status;
+
+ msleep(500);
+
+ status = rt3883_pci_rr(RT3883_PCI_REG_STATUS(1));
+ if (status & BIT(0))
+ return 0;
+
+ /* TODO: reset PCIe and turn off PCIe clock */
+
+ return -ENODEV;
+}
+
+void __init rt3883_pci_init(unsigned mode)
+{
+ u32 val;
+ int err;
+
+ rt3883_pci_preinit(mode);
+
+ rt3883_pci_base = ioremap(RT3883_PCI_BASE, PAGE_SIZE);
+ if (rt3883_pci_base == NULL) {
+ pr_err("failed to ioremap PCI registers\n");
+ return;
+ }
+
+ rt3883_pci_wr(0, RT3883_PCI_REG_PCICFG_ADDR);
+ if (mode & RT3883_PCI_MODE_PCI)
+ rt3883_pci_wr(BIT(16), RT3883_PCI_REG_PCICFG_ADDR);
+
+ msleep(500);
+
+ if (mode & RT3883_PCI_MODE_PCIE) {
+ err = rt3883_pcie_ready();
+ if (err)
+ return;
+ }
+
+ if (mode & RT3883_PCI_MODE_PCI)
+ rt3883_pci_wr(0x79, RT3883_PCI_REG_ARBCTL);
+
+ rt3883_pci_wr(RT3883_PCI_MEM_BASE, RT3883_PCI_REG_MEMBASE);
+ rt3883_pci_wr(RT3883_PCI_IO_BASE, RT3883_PCI_REG_IOBASE);
+
+ /* PCI */
+ rt3883_pci_wr(0x03ff0000, RT3883_PCI_REG_BAR0SETUP_ADDR(0));
+ rt3883_pci_wr(RT3883_MEMORY_BASE, RT3883_PCI_REG_IMBASEBAR0_ADDR(0));
+ rt3883_pci_wr(0x08021814, RT3883_PCI_REG_ID(0));
+ rt3883_pci_wr(0x00800001, RT3883_PCI_REG_CLASS(0));
+ rt3883_pci_wr(0x28801814, RT3883_PCI_REG_SUBID(0));
+
+ /* PCIe */
+ rt3883_pci_wr(0x01ff0000, RT3883_PCI_REG_BAR0SETUP_ADDR(1));
+ rt3883_pci_wr(RT3883_MEMORY_BASE, RT3883_PCI_REG_IMBASEBAR0_ADDR(1));
+ rt3883_pci_wr(0x08021814, RT3883_PCI_REG_ID(1));
+ rt3883_pci_wr(0x06040001, RT3883_PCI_REG_CLASS(1));
+ rt3883_pci_wr(0x28801814, RT3883_PCI_REG_SUBID(1));
+
+ rt3883_pci_irq_init();
+
+ /* PCIe */
+ val = rt3883_pci_read_u32(0, 0x01, 0, PCI_COMMAND);
+ val |= 0x7;
+ rt3883_pci_write_u32(0, 0x01, 0, PCI_COMMAND, val);
+
+ /* PCI */
+ val = rt3883_pci_read_u32(0, 0x00, 0, PCI_COMMAND);
+ val |= 0x7;
+ rt3883_pci_write_u32(0, 0x00, 0, PCI_COMMAND, val);
+
+ ioport_resource.start = rt3883_pci_io_resource.start;
+ ioport_resource.end = rt3883_pci_io_resource.end;
+
+ register_pci_controller(&rt3883_pci_controller);
+}
+
+int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+ int irq = -1;
+
+ switch (dev->bus->number) {
+ case 0:
+ switch (PCI_SLOT(dev->devfn)) {
+ case 0x00:
+ rt3883_pci_wr(0x03ff0001,
+ RT3883_PCI_REG_BAR0SETUP_ADDR(0));
+ rt3883_pci_wr(0x03ff0001,
+ RT3883_PCI_REG_BAR0SETUP_ADDR(1));
+
+ rt3883_pci_write_u32(0, 0x00, 0, PCI_BASE_ADDRESS_0,
+ RT3883_MEMORY_BASE);
+ rt3883_pci_read_u32(0, 0x00, 0, PCI_BASE_ADDRESS_0);
+
+ irq = RT3883_CPU_IRQ_PCI;
+ break;
+ case 0x01:
+ rt3883_pci_write_u32(0, 0x01, 0, PCI_IO_BASE,
+ 0x00000101);
+ break;
+ case 0x11:
+ irq = RT3883_PCI_IRQ_PCI0;
+ break;
+ case 0x12:
+ irq = RT3883_PCI_IRQ_PCI1;
+ break;
+ }
+ break;
+
+ case 1:
+ irq = RT3883_PCI_IRQ_PCIE;
+ break;
+
+ default:
+ dev_err(&dev->dev, "no IRQ specified\n");
+ return irq;
+ }
+
+ return irq;
+}
+
+void __init rt3883_pci_set_plat_dev_init(int (*f)(struct pci_dev *dev))
+{
+ rt3883_pci_plat_dev_init = f;
+}
+
+int pcibios_plat_dev_init(struct pci_dev *dev)
+{
+ if (rt3883_pci_plat_dev_init)
+ return rt3883_pci_plat_dev_init(dev);
+
+ return 0;
+}
--- a/arch/mips/ralink/Kconfig
+++ b/arch/mips/ralink/Kconfig
@@ -20,6 +20,7 @@ choice
bool "RT3883"
select USB_ARCH_HAS_OHCI
select USB_ARCH_HAS_EHCI
+ select HW_HAS_PCI
config SOC_MT7620
bool "MT7620"
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