+++ /dev/null
-From 4201b6aeb059b481571c241a2fc96fd3f41032e9 Mon Sep 17 00:00:00 2001
-From: Gabor Juhos <juhosg@openwrt.org>
-Date: Wed, 14 Mar 2012 10:36:10 +0100
-Subject: [PATCH 19/47] MIPS: ath79: add support for the PCI host controller of the AR71XX SoCs
-
-The Atheros AR71XX SoCs have a built-in PCI Host Controller.
-This patch adds a driver for that, and modifies the relevant
-files in order to allow to register the PCI controller from
-board specific setup.
-
-Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
-Signed-off-by: Imre Kaloz <kaloz@openwrt.org>
-Cc: linux-mips@linux-mips.org
-Patchwork: https://patchwork.linux-mips.org/patch/3498/
-Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
----
- arch/mips/ath79/Kconfig | 1 +
- arch/mips/include/asm/mach-ath79/pci.h | 6 +
- arch/mips/pci/Makefile | 1 +
- arch/mips/pci/pci-ar71xx.c | 375 ++++++++++++++++++++++++++++++++
- 4 files changed, 383 insertions(+), 0 deletions(-)
- create mode 100644 arch/mips/pci/pci-ar71xx.c
-
---- a/arch/mips/ath79/Kconfig
-+++ b/arch/mips/ath79/Kconfig
-@@ -52,6 +52,7 @@ endmenu
- config SOC_AR71XX
- select USB_ARCH_HAS_EHCI
- select USB_ARCH_HAS_OHCI
-+ select HW_HAS_PCI
- def_bool n
-
- config SOC_AR724X
---- a/arch/mips/include/asm/mach-ath79/pci.h
-+++ b/arch/mips/include/asm/mach-ath79/pci.h
-@@ -11,6 +11,12 @@
- #ifndef __ASM_MACH_ATH79_PCI_H
- #define __ASM_MACH_ATH79_PCI_H
-
-+#if defined(CONFIG_PCI) && defined(CONFIG_SOC_AR71XX)
-+int ar71xx_pcibios_init(void);
-+#else
-+static inline int ar71xx_pcibios_init(void) { return 0; }
-+#endif
-+
- #if defined(CONFIG_PCI) && defined(CONFIG_SOC_AR724X)
- int ar724x_pcibios_init(int irq);
- #else
---- a/arch/mips/pci/Makefile
-+++ b/arch/mips/pci/Makefile
-@@ -19,6 +19,7 @@ obj-$(CONFIG_BCM47XX) += pci-bcm47xx.o
- obj-$(CONFIG_BCM63XX) += pci-bcm63xx.o fixup-bcm63xx.o \
- ops-bcm63xx.o
- obj-$(CONFIG_MIPS_ALCHEMY) += pci-alchemy.o
-+obj-$(CONFIG_SOC_AR71XX) += pci-ar71xx.o
- obj-$(CONFIG_SOC_AR724X) += pci-ar724x.o
-
- #
---- /dev/null
-+++ b/arch/mips/pci/pci-ar71xx.c
-@@ -0,0 +1,375 @@
-+/*
-+ * Atheros AR71xx PCI host controller driver
-+ *
-+ * Copyright (C) 2008-2011 Gabor Juhos <juhosg@openwrt.org>
-+ * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
-+ *
-+ * Parts of this file are based on Atheros' 2.6.15 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/resource.h>
-+#include <linux/types.h>
-+#include <linux/delay.h>
-+#include <linux/bitops.h>
-+#include <linux/pci.h>
-+#include <linux/pci_regs.h>
-+#include <linux/interrupt.h>
-+
-+#include <asm/mach-ath79/ar71xx_regs.h>
-+#include <asm/mach-ath79/ath79.h>
-+#include <asm/mach-ath79/pci.h>
-+
-+#define AR71XX_PCI_MEM_BASE 0x10000000
-+#define AR71XX_PCI_MEM_SIZE 0x08000000
-+
-+#define AR71XX_PCI_WIN0_OFFS 0x10000000
-+#define AR71XX_PCI_WIN1_OFFS 0x11000000
-+#define AR71XX_PCI_WIN2_OFFS 0x12000000
-+#define AR71XX_PCI_WIN3_OFFS 0x13000000
-+#define AR71XX_PCI_WIN4_OFFS 0x14000000
-+#define AR71XX_PCI_WIN5_OFFS 0x15000000
-+#define AR71XX_PCI_WIN6_OFFS 0x16000000
-+#define AR71XX_PCI_WIN7_OFFS 0x07000000
-+
-+#define AR71XX_PCI_CFG_BASE \
-+ (AR71XX_PCI_MEM_BASE + AR71XX_PCI_WIN7_OFFS + 0x10000)
-+#define AR71XX_PCI_CFG_SIZE 0x100
-+
-+#define AR71XX_PCI_REG_CRP_AD_CBE 0x00
-+#define AR71XX_PCI_REG_CRP_WRDATA 0x04
-+#define AR71XX_PCI_REG_CRP_RDDATA 0x08
-+#define AR71XX_PCI_REG_CFG_AD 0x0c
-+#define AR71XX_PCI_REG_CFG_CBE 0x10
-+#define AR71XX_PCI_REG_CFG_WRDATA 0x14
-+#define AR71XX_PCI_REG_CFG_RDDATA 0x18
-+#define AR71XX_PCI_REG_PCI_ERR 0x1c
-+#define AR71XX_PCI_REG_PCI_ERR_ADDR 0x20
-+#define AR71XX_PCI_REG_AHB_ERR 0x24
-+#define AR71XX_PCI_REG_AHB_ERR_ADDR 0x28
-+
-+#define AR71XX_PCI_CRP_CMD_WRITE 0x00010000
-+#define AR71XX_PCI_CRP_CMD_READ 0x00000000
-+#define AR71XX_PCI_CFG_CMD_READ 0x0000000a
-+#define AR71XX_PCI_CFG_CMD_WRITE 0x0000000b
-+
-+#define AR71XX_PCI_INT_CORE BIT(4)
-+#define AR71XX_PCI_INT_DEV2 BIT(2)
-+#define AR71XX_PCI_INT_DEV1 BIT(1)
-+#define AR71XX_PCI_INT_DEV0 BIT(0)
-+
-+#define AR71XX_PCI_IRQ_COUNT 5
-+
-+static DEFINE_SPINLOCK(ar71xx_pci_lock);
-+static void __iomem *ar71xx_pcicfg_base;
-+
-+/* Byte lane enable bits */
-+static const u8 ar71xx_pci_ble_table[4][4] = {
-+ {0x0, 0xf, 0xf, 0xf},
-+ {0xe, 0xd, 0xb, 0x7},
-+ {0xc, 0xf, 0x3, 0xf},
-+ {0xf, 0xf, 0xf, 0xf},
-+};
-+
-+static const u32 ar71xx_pci_read_mask[8] = {
-+ 0, 0xff, 0xffff, 0, 0xffffffff, 0, 0, 0
-+};
-+
-+static inline u32 ar71xx_pci_get_ble(int where, int size, int local)
-+{
-+ u32 t;
-+
-+ t = ar71xx_pci_ble_table[size & 3][where & 3];
-+ BUG_ON(t == 0xf);
-+ t <<= (local) ? 20 : 4;
-+
-+ return t;
-+}
-+
-+static inline u32 ar71xx_pci_bus_addr(struct pci_bus *bus, unsigned int devfn,
-+ int where)
-+{
-+ u32 ret;
-+
-+ if (!bus->number) {
-+ /* type 0 */
-+ ret = (1 << PCI_SLOT(devfn)) | (PCI_FUNC(devfn) << 8) |
-+ (where & ~3);
-+ } else {
-+ /* type 1 */
-+ ret = (bus->number << 16) | (PCI_SLOT(devfn) << 11) |
-+ (PCI_FUNC(devfn) << 8) | (where & ~3) | 1;
-+ }
-+
-+ return ret;
-+}
-+
-+static int ar71xx_pci_check_error(int quiet)
-+{
-+ void __iomem *base = ar71xx_pcicfg_base;
-+ u32 pci_err;
-+ u32 ahb_err;
-+
-+ pci_err = __raw_readl(base + AR71XX_PCI_REG_PCI_ERR) & 3;
-+ if (pci_err) {
-+ if (!quiet) {
-+ u32 addr;
-+
-+ addr = __raw_readl(base + AR71XX_PCI_REG_PCI_ERR_ADDR);
-+ pr_crit("ar71xx: %s bus error %d at addr 0x%x\n",
-+ "PCI", pci_err, addr);
-+ }
-+
-+ /* clear PCI error status */
-+ __raw_writel(pci_err, base + AR71XX_PCI_REG_PCI_ERR);
-+ }
-+
-+ ahb_err = __raw_readl(base + AR71XX_PCI_REG_AHB_ERR) & 1;
-+ if (ahb_err) {
-+ if (!quiet) {
-+ u32 addr;
-+
-+ addr = __raw_readl(base + AR71XX_PCI_REG_AHB_ERR_ADDR);
-+ pr_crit("ar71xx: %s bus error %d at addr 0x%x\n",
-+ "AHB", ahb_err, addr);
-+ }
-+
-+ /* clear AHB error status */
-+ __raw_writel(ahb_err, base + AR71XX_PCI_REG_AHB_ERR);
-+ }
-+
-+ return !!(ahb_err | pci_err);
-+}
-+
-+static inline void ar71xx_pci_local_write(int where, int size, u32 value)
-+{
-+ void __iomem *base = ar71xx_pcicfg_base;
-+ u32 ad_cbe;
-+
-+ value = value << (8 * (where & 3));
-+
-+ ad_cbe = AR71XX_PCI_CRP_CMD_WRITE | (where & ~3);
-+ ad_cbe |= ar71xx_pci_get_ble(where, size, 1);
-+
-+ __raw_writel(ad_cbe, base + AR71XX_PCI_REG_CRP_AD_CBE);
-+ __raw_writel(value, base + AR71XX_PCI_REG_CRP_WRDATA);
-+}
-+
-+static inline int ar71xx_pci_set_cfgaddr(struct pci_bus *bus,
-+ unsigned int devfn,
-+ int where, int size, u32 cmd)
-+{
-+ void __iomem *base = ar71xx_pcicfg_base;
-+ u32 addr;
-+
-+ addr = ar71xx_pci_bus_addr(bus, devfn, where);
-+
-+ __raw_writel(addr, base + AR71XX_PCI_REG_CFG_AD);
-+ __raw_writel(cmd | ar71xx_pci_get_ble(where, size, 0),
-+ base + AR71XX_PCI_REG_CFG_CBE);
-+
-+ return ar71xx_pci_check_error(1);
-+}
-+
-+static int ar71xx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
-+ int where, int size, u32 *value)
-+{
-+ void __iomem *base = ar71xx_pcicfg_base;
-+ unsigned long flags;
-+ u32 data;
-+ int err;
-+ int ret;
-+
-+ ret = PCIBIOS_SUCCESSFUL;
-+ data = ~0;
-+
-+ spin_lock_irqsave(&ar71xx_pci_lock, flags);
-+
-+ err = ar71xx_pci_set_cfgaddr(bus, devfn, where, size,
-+ AR71XX_PCI_CFG_CMD_READ);
-+ if (err)
-+ ret = PCIBIOS_DEVICE_NOT_FOUND;
-+ else
-+ data = __raw_readl(base + AR71XX_PCI_REG_CFG_RDDATA);
-+
-+ spin_unlock_irqrestore(&ar71xx_pci_lock, flags);
-+
-+ *value = (data >> (8 * (where & 3))) & ar71xx_pci_read_mask[size & 7];
-+
-+ return ret;
-+}
-+
-+static int ar71xx_pci_write_config(struct pci_bus *bus, unsigned int devfn,
-+ int where, int size, u32 value)
-+{
-+ void __iomem *base = ar71xx_pcicfg_base;
-+ unsigned long flags;
-+ int err;
-+ int ret;
-+
-+ value = value << (8 * (where & 3));
-+ ret = PCIBIOS_SUCCESSFUL;
-+
-+ spin_lock_irqsave(&ar71xx_pci_lock, flags);
-+
-+ err = ar71xx_pci_set_cfgaddr(bus, devfn, where, size,
-+ AR71XX_PCI_CFG_CMD_WRITE);
-+ if (err)
-+ ret = PCIBIOS_DEVICE_NOT_FOUND;
-+ else
-+ __raw_writel(value, base + AR71XX_PCI_REG_CFG_WRDATA);
-+
-+ spin_unlock_irqrestore(&ar71xx_pci_lock, flags);
-+
-+ return ret;
-+}
-+
-+static struct pci_ops ar71xx_pci_ops = {
-+ .read = ar71xx_pci_read_config,
-+ .write = ar71xx_pci_write_config,
-+};
-+
-+static struct resource ar71xx_pci_io_resource = {
-+ .name = "PCI IO space",
-+ .start = 0,
-+ .end = 0,
-+ .flags = IORESOURCE_IO,
-+};
-+
-+static struct resource ar71xx_pci_mem_resource = {
-+ .name = "PCI memory space",
-+ .start = AR71XX_PCI_MEM_BASE,
-+ .end = AR71XX_PCI_MEM_BASE + AR71XX_PCI_MEM_SIZE - 1,
-+ .flags = IORESOURCE_MEM
-+};
-+
-+static struct pci_controller ar71xx_pci_controller = {
-+ .pci_ops = &ar71xx_pci_ops,
-+ .mem_resource = &ar71xx_pci_mem_resource,
-+ .io_resource = &ar71xx_pci_io_resource,
-+};
-+
-+static void ar71xx_pci_irq_handler(unsigned int irq, struct irq_desc *desc)
-+{
-+ void __iomem *base = ath79_reset_base;
-+ u32 pending;
-+
-+ pending = __raw_readl(base + AR71XX_RESET_REG_PCI_INT_STATUS) &
-+ __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
-+
-+ if (pending & AR71XX_PCI_INT_DEV0)
-+ generic_handle_irq(ATH79_PCI_IRQ(0));
-+
-+ else if (pending & AR71XX_PCI_INT_DEV1)
-+ generic_handle_irq(ATH79_PCI_IRQ(1));
-+
-+ else if (pending & AR71XX_PCI_INT_DEV2)
-+ generic_handle_irq(ATH79_PCI_IRQ(2));
-+
-+ else if (pending & AR71XX_PCI_INT_CORE)
-+ generic_handle_irq(ATH79_PCI_IRQ(4));
-+
-+ else
-+ spurious_interrupt();
-+}
-+
-+static void ar71xx_pci_irq_unmask(struct irq_data *d)
-+{
-+ unsigned int irq = d->irq - ATH79_PCI_IRQ_BASE;
-+ void __iomem *base = ath79_reset_base;
-+ u32 t;
-+
-+ t = __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
-+ __raw_writel(t | (1 << irq), base + AR71XX_RESET_REG_PCI_INT_ENABLE);
-+
-+ /* flush write */
-+ __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
-+}
-+
-+static void ar71xx_pci_irq_mask(struct irq_data *d)
-+{
-+ unsigned int irq = d->irq - ATH79_PCI_IRQ_BASE;
-+ void __iomem *base = ath79_reset_base;
-+ u32 t;
-+
-+ t = __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
-+ __raw_writel(t & ~(1 << irq), base + AR71XX_RESET_REG_PCI_INT_ENABLE);
-+
-+ /* flush write */
-+ __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
-+}
-+
-+static struct irq_chip ar71xx_pci_irq_chip = {
-+ .name = "AR71XX PCI",
-+ .irq_mask = ar71xx_pci_irq_mask,
-+ .irq_unmask = ar71xx_pci_irq_unmask,
-+ .irq_mask_ack = ar71xx_pci_irq_mask,
-+};
-+
-+static __init void ar71xx_pci_irq_init(void)
-+{
-+ void __iomem *base = ath79_reset_base;
-+ int i;
-+
-+ __raw_writel(0, base + AR71XX_RESET_REG_PCI_INT_ENABLE);
-+ __raw_writel(0, base + AR71XX_RESET_REG_PCI_INT_STATUS);
-+
-+ BUILD_BUG_ON(ATH79_PCI_IRQ_COUNT < AR71XX_PCI_IRQ_COUNT);
-+
-+ for (i = ATH79_PCI_IRQ_BASE;
-+ i < ATH79_PCI_IRQ_BASE + AR71XX_PCI_IRQ_COUNT; i++)
-+ irq_set_chip_and_handler(i, &ar71xx_pci_irq_chip,
-+ handle_level_irq);
-+
-+ irq_set_chained_handler(ATH79_CPU_IRQ_IP2, ar71xx_pci_irq_handler);
-+}
-+
-+static __init void ar71xx_pci_reset(void)
-+{
-+ void __iomem *ddr_base = ath79_ddr_base;
-+
-+ ath79_device_reset_set(AR71XX_RESET_PCI_BUS | AR71XX_RESET_PCI_CORE);
-+ mdelay(100);
-+
-+ ath79_device_reset_clear(AR71XX_RESET_PCI_BUS | AR71XX_RESET_PCI_CORE);
-+ mdelay(100);
-+
-+ __raw_writel(AR71XX_PCI_WIN0_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN0);
-+ __raw_writel(AR71XX_PCI_WIN1_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN1);
-+ __raw_writel(AR71XX_PCI_WIN2_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN2);
-+ __raw_writel(AR71XX_PCI_WIN3_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN3);
-+ __raw_writel(AR71XX_PCI_WIN4_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN4);
-+ __raw_writel(AR71XX_PCI_WIN5_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN5);
-+ __raw_writel(AR71XX_PCI_WIN6_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN6);
-+ __raw_writel(AR71XX_PCI_WIN7_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN7);
-+
-+ mdelay(100);
-+}
-+
-+__init int ar71xx_pcibios_init(void)
-+{
-+ u32 t;
-+
-+ ar71xx_pcicfg_base = ioremap(AR71XX_PCI_CFG_BASE, AR71XX_PCI_CFG_SIZE);
-+ if (ar71xx_pcicfg_base == NULL)
-+ return -ENOMEM;
-+
-+ ar71xx_pci_reset();
-+
-+ /* setup COMMAND register */
-+ t = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE
-+ | PCI_COMMAND_PARITY | PCI_COMMAND_SERR | PCI_COMMAND_FAST_BACK;
-+ ar71xx_pci_local_write(PCI_COMMAND, 4, t);
-+
-+ /* clear bus errors */
-+ ar71xx_pci_check_error(1);
-+
-+ ar71xx_pci_irq_init();
-+
-+ register_pci_controller(&ar71xx_pci_controller);
-+
-+ return 0;
-+}
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