--- /dev/null
+/*
+ * Atheros AR71xx PCI host controller driver
+ *
+ * Copyright (C) 2008-2010 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-ar71xx/ar71xx.h>
+#include <asm/mach-ar71xx/pci.h>
+
+#undef DEBUG
+#ifdef DEBUG
+#define DBG(fmt, args...) printk(KERN_DEBUG fmt, ## args)
+#else
+#define DBG(fmt, args...)
+#endif
+
+#define AR71XX_PCI_DELAY 100 /* msecs */
+
+#if 0
+#define PCI_IDSEL_BASE PCI_IDSEL_ADL_START
+#else
+#define PCI_IDSEL_BASE 0
+#endif
+
+static void __iomem *ar71xx_pcicfg_base;
+static DEFINE_SPINLOCK(ar71xx_pci_lock);
+static int ar71xx_pci_fixup_enable;
+
+static inline void ar71xx_pci_delay(void)
+{
+ mdelay(AR71XX_PCI_DELAY);
+}
+
+/* Byte lane enable bits */
+static u8 ble_table[4][4] = {
+ {0x0, 0xf, 0xf, 0xf},
+ {0xe, 0xd, 0xb, 0x7},
+ {0xc, 0xf, 0x3, 0xf},
+ {0xf, 0xf, 0xf, 0xf},
+};
+
+static inline u32 ar71xx_pci_get_ble(int where, int size, int local)
+{
+ u32 t;
+
+ t = 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_IDSEL_BASE + 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;
+}
+
+int ar71xx_pci_be_handler(int is_fixup)
+{
+ void __iomem *base = ar71xx_pcicfg_base;
+ u32 pci_err;
+ u32 ahb_err;
+
+ pci_err = __raw_readl(base + PCI_REG_PCI_ERR) & 3;
+ if (pci_err) {
+ if (!is_fixup)
+ printk(KERN_ALERT "PCI error %d at PCI addr 0x%x\n",
+ pci_err,
+ __raw_readl(base + PCI_REG_PCI_ERR_ADDR));
+
+ __raw_writel(pci_err, base + PCI_REG_PCI_ERR);
+ }
+
+ ahb_err = __raw_readl(base + PCI_REG_AHB_ERR) & 1;
+ if (ahb_err) {
+ if (!is_fixup)
+ printk(KERN_ALERT "AHB error at AHB address 0x%x\n",
+ __raw_readl(base + PCI_REG_AHB_ERR_ADDR));
+
+ __raw_writel(ahb_err, base + PCI_REG_AHB_ERR);
+ }
+
+ return (ahb_err | pci_err) ? 1 : 0;
+}
+
+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);
+
+ DBG("PCI: set cfgaddr: %02x:%02x.%01x/%02x:%01d, addr=%08x\n",
+ bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn),
+ where, size, addr);
+
+ __raw_writel(addr, base + PCI_REG_CFG_AD);
+ __raw_writel(cmd | ar71xx_pci_get_ble(where, size, 0),
+ base + PCI_REG_CFG_CBE);
+
+ return ar71xx_pci_be_handler(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;
+ static u32 mask[8] = {0, 0xff, 0xffff, 0, 0xffffffff, 0, 0, 0};
+ unsigned long flags;
+ u32 data;
+ int retry = 0;
+ int ret;
+
+ ret = PCIBIOS_SUCCESSFUL;
+
+ DBG("PCI: read config: %02x:%02x.%01x/%02x:%01d\n", bus->number,
+ PCI_SLOT(devfn), PCI_FUNC(devfn), where, size);
+
+retry:
+ spin_lock_irqsave(&ar71xx_pci_lock, flags);
+
+ if (bus->number == 0 && devfn == 0) {
+ u32 t;
+
+ t = PCI_CRP_CMD_READ | (where & ~3);
+
+ __raw_writel(t, base + PCI_REG_CRP_AD_CBE);
+ data = __raw_readl(base + PCI_REG_CRP_RDDATA);
+
+ DBG("PCI: rd local cfg, ad_cbe:%08x, data:%08x\n", t, data);
+
+ } else {
+ int err;
+
+ err = ar71xx_pci_set_cfgaddr(bus, devfn, where, size,
+ PCI_CFG_CMD_READ);
+
+ if (err == 0) {
+ data = __raw_readl(base + PCI_REG_CFG_RDDATA);
+ } else {
+ ret = PCIBIOS_DEVICE_NOT_FOUND;
+ data = ~0;
+ }
+ }
+
+ spin_unlock_irqrestore(&ar71xx_pci_lock, flags);
+
+ DBG("PCI: read config: data=%08x raw=%08x\n",
+ (data >> (8 * (where & 3))) & mask[size & 7], data);
+
+ *value = (data >> (8 * (where & 3))) & mask[size & 7];
+
+ /*
+ * PCI controller bug: sometimes reads to the PCI_COMMAND register
+ * return 0xffff, even though the PCI trace shows the correct value.
+ * Work around this by retrying reads to this register
+ */
+ if (where == PCI_COMMAND && (*value & 0xffff) == 0xffff && retry++ < 2)
+ goto retry;
+
+ 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 ret;
+
+ DBG("PCI: write config: %02x:%02x.%01x/%02x:%01d value=%08x\n",
+ bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn),
+ where, size, value);
+
+ value = value << (8 * (where & 3));
+ ret = PCIBIOS_SUCCESSFUL;
+
+ spin_lock_irqsave(&ar71xx_pci_lock, flags);
+ if (bus->number == 0 && devfn == 0) {
+ u32 t;
+
+ t = PCI_CRP_CMD_WRITE | (where & ~3);
+ t |= ar71xx_pci_get_ble(where, size, 1);
+
+ DBG("PCI: wr local cfg, ad_cbe:%08x, value:%08x\n", t, value);
+
+ __raw_writel(t, base + PCI_REG_CRP_AD_CBE);
+ __raw_writel(value, base + PCI_REG_CRP_WRDATA);
+ } else {
+ int err;
+
+ err = ar71xx_pci_set_cfgaddr(bus, devfn, where, size,
+ PCI_CFG_CMD_WRITE);
+
+ if (err == 0)
+ __raw_writel(value, base + PCI_REG_CFG_WRDATA);
+ else
+ ret = PCIBIOS_DEVICE_NOT_FOUND;
+ }
+ spin_unlock_irqrestore(&ar71xx_pci_lock, flags);
+
+ return ret;
+}
+
+static void ar71xx_pci_fixup(struct pci_dev *dev)
+{
+ u32 t;
+
+ if (!ar71xx_pci_fixup_enable)
+ return;
+
+ if (dev->bus->number != 0 || dev->devfn != 0)
+ return;
+
+ DBG("PCI: fixup host controller %s (%04x:%04x)\n", pci_name(dev),
+ dev->vendor, dev->device);
+
+ /* setup COMMAND register */
+ t = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE
+ | PCI_COMMAND_PARITY | PCI_COMMAND_SERR | PCI_COMMAND_FAST_BACK;
+
+ pci_write_config_word(dev, PCI_COMMAND, t);
+}
+DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, ar71xx_pci_fixup);
+
+int __init ar71xx_pcibios_map_irq(const struct pci_dev *dev, uint8_t slot,
+ uint8_t pin)
+{
+ int irq = -1;
+ int i;
+
+ slot -= PCI_IDSEL_ADL_START - PCI_IDSEL_BASE;
+
+ for (i = 0; i < ar71xx_pci_nr_irqs; i++) {
+ struct ar71xx_pci_irq *entry;
+
+ entry = &ar71xx_pci_irq_map[i];
+ if (entry->slot == slot && entry->pin == pin) {
+ irq = entry->irq;
+ break;
+ }
+ }
+
+ if (irq < 0) {
+ printk(KERN_ALERT "PCI: no irq found for pin%u@%s\n",
+ pin, pci_name((struct pci_dev *)dev));
+ } else {
+ printk(KERN_INFO "PCI: mapping irq %d to pin%u@%s\n",
+ irq, pin, pci_name((struct pci_dev *)dev));
+ }
+
+ return irq;
+}
+
+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 = ar71xx_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 & PCI_INT_DEV0)
+ generic_handle_irq(AR71XX_PCI_IRQ_DEV0);
+
+ else if (pending & PCI_INT_DEV1)
+ generic_handle_irq(AR71XX_PCI_IRQ_DEV1);
+
+ else if (pending & PCI_INT_DEV2)
+ generic_handle_irq(AR71XX_PCI_IRQ_DEV2);
+
+ else if (pending & PCI_INT_CORE)
+ generic_handle_irq(AR71XX_PCI_IRQ_CORE);
+
+ else
+ spurious_interrupt();
+}
+
+static void ar71xx_pci_irq_unmask(struct irq_data *d)
+{
+ unsigned int irq = d->irq - AR71XX_PCI_IRQ_BASE;
+ void __iomem *base = ar71xx_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 */
+ (void) __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
+}
+
+static void ar71xx_pci_irq_mask(struct irq_data *d)
+{
+ unsigned int irq = d->irq - AR71XX_PCI_IRQ_BASE;
+ void __iomem *base = ar71xx_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 */
+ (void) __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 void __init ar71xx_pci_irq_init(void)
+{
+ void __iomem *base = ar71xx_reset_base;
+ int i;
+
+ __raw_writel(0, base + AR71XX_RESET_REG_PCI_INT_ENABLE);
+ __raw_writel(0, base + AR71XX_RESET_REG_PCI_INT_STATUS);
+
+ for (i = AR71XX_PCI_IRQ_BASE;
+ i < AR71XX_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(AR71XX_CPU_IRQ_IP2, ar71xx_pci_irq_handler);
+}
+
+int __init ar71xx_pcibios_init(void)
+{
+ void __iomem *ddr_base = ar71xx_ddr_base;
+
+ ar71xx_device_stop(RESET_MODULE_PCI_BUS | RESET_MODULE_PCI_CORE);
+ ar71xx_pci_delay();
+
+ ar71xx_device_start(RESET_MODULE_PCI_BUS | RESET_MODULE_PCI_CORE);
+ ar71xx_pci_delay();
+
+ ar71xx_pcicfg_base = ioremap_nocache(AR71XX_PCI_CFG_BASE,
+ AR71XX_PCI_CFG_SIZE);
+ if (ar71xx_pcicfg_base == NULL)
+ return -ENOMEM;
+
+ __raw_writel(PCI_WIN0_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN0);
+ __raw_writel(PCI_WIN1_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN1);
+ __raw_writel(PCI_WIN2_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN2);
+ __raw_writel(PCI_WIN3_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN3);
+ __raw_writel(PCI_WIN4_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN4);
+ __raw_writel(PCI_WIN5_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN5);
+ __raw_writel(PCI_WIN6_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN6);
+ __raw_writel(PCI_WIN7_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN7);
+
+ ar71xx_pci_delay();
+
+ /* clear bus errors */
+ (void)ar71xx_pci_be_handler(1);
+
+ ar71xx_pci_fixup_enable = 1;
+ ar71xx_pci_irq_init();
+ register_pci_controller(&ar71xx_pci_controller);
+
+ return 0;
+}
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