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348 lines
8.1 KiB
C
348 lines
8.1 KiB
C
/*
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* Atheros AR71xx PCI host controller driver
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*
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* Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
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* Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
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*
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* Parts of this file are based on Atheros' 2.6.15 BSP
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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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#include <linux/resource.h>
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#include <linux/types.h>
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#include <linux/delay.h>
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#include <linux/bitops.h>
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#include <linux/pci.h>
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#include <linux/pci_regs.h>
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#include <asm/mach-ar71xx/ar71xx.h>
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#include <asm/mach-ar71xx/pci.h>
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#undef DEBUG
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#ifdef DEBUG
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#define DBG(fmt, args...) printk(KERN_DEBUG fmt, ## args)
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#else
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#define DBG(fmt, args...)
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#endif
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#define AR71XX_PCI_DELAY 100 /* msecs */
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#if 0
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#define PCI_IDSEL_BASE PCI_IDSEL_ADL_START
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#else
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#define PCI_IDSEL_BASE 0
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#endif
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static unsigned ar71xx_pci_nr_irqs;
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static struct ar71xx_pci_irq *ar71xx_pci_irq_map __initdata;
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static void __iomem *ar71xx_pcicfg_base;
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static DEFINE_SPINLOCK(ar71xx_pci_lock);
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static inline void ar71xx_pci_delay(void)
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{
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mdelay(AR71XX_PCI_DELAY);
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}
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static inline u32 ar71xx_pcicfg_rr(unsigned int reg)
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{
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return __raw_readl(ar71xx_pcicfg_base + reg);
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}
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static inline void ar71xx_pcicfg_wr(unsigned int reg, u32 val)
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{
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__raw_writel(val, ar71xx_pcicfg_base + reg);
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}
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/* Byte lane enable bits */
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static u8 ble_table[4][4] = {
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{0x0, 0xf, 0xf, 0xf},
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{0xe, 0xd, 0xb, 0x7},
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{0xc, 0xf, 0x3, 0xf},
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{0xf, 0xf, 0xf, 0xf},
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};
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static inline u32 ar71xx_pci_get_ble(int where, int size, int local)
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{
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u32 t;
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t = ble_table[size & 3][where & 3];
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BUG_ON(t == 0xf);
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t <<= (local) ? 20 : 4;
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return t;
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}
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static inline u32 ar71xx_pci_bus_addr(struct pci_bus *bus, unsigned int devfn,
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int where)
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{
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u32 ret;
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if (!bus->number) {
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/* type 0 */
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ret = (1 << (PCI_IDSEL_BASE + PCI_SLOT(devfn)))
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| (PCI_FUNC(devfn) << 8) | (where & ~3);
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} else {
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/* type 1 */
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ret = (bus->number << 16) | (PCI_SLOT(devfn) << 11)
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| (PCI_FUNC(devfn) << 8) | (where & ~3) | 1;
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}
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return ret;
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}
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static int __ar71xx_pci_be_handler(int is_fixup)
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{
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u32 pci_err;
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u32 ahb_err;
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pci_err = ar71xx_pcicfg_rr(PCI_REG_PCI_ERR) & 3;
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if (pci_err) {
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if (!is_fixup)
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printk(KERN_ALERT "PCI error %d at PCI addr 0x%x\n",
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pci_err,
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ar71xx_pcicfg_rr(PCI_REG_PCI_ERR_ADDR));
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ar71xx_pcicfg_wr(PCI_REG_PCI_ERR, pci_err);
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}
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ahb_err = ar71xx_pcicfg_rr(PCI_REG_AHB_ERR) & 1;
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if (ahb_err) {
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if (!is_fixup)
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printk(KERN_ALERT "AHB error at AHB address 0x%x\n",
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ar71xx_pcicfg_rr(PCI_REG_AHB_ERR_ADDR));
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ar71xx_pcicfg_wr(PCI_REG_AHB_ERR, ahb_err);
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}
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return ((ahb_err | pci_err) ? 1 : 0);
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}
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static inline int ar71xx_pci_set_cfgaddr(struct pci_bus *bus,
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unsigned int devfn, int where, int size, u32 cmd)
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{
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u32 addr;
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addr = ar71xx_pci_bus_addr(bus, devfn, where);
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DBG("PCI: set cfgaddr: %02x:%02x.%01x/%02x:%01d, addr=%08x\n",
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bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn),
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where, size, addr);
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ar71xx_pcicfg_wr(PCI_REG_CFG_AD, addr);
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ar71xx_pcicfg_wr(PCI_REG_CFG_CBE,
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cmd | ar71xx_pci_get_ble(where, size, 0));
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return __ar71xx_pci_be_handler(1);
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}
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static int ar71xx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
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int where, int size, u32 *value)
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{
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static u32 mask[8] = {0, 0xff, 0xffff, 0, 0xffffffff, 0, 0, 0};
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unsigned long flags;
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u32 data;
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int ret;
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ret = PCIBIOS_SUCCESSFUL;
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DBG("PCI: read config: %02x:%02x.%01x/%02x:%01d\n", bus->number,
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PCI_SLOT(devfn), PCI_FUNC(devfn), where, size);
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spin_lock_irqsave(&ar71xx_pci_lock, flags);
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if (bus->number == 0 && devfn == 0) {
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u32 t;
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t = PCI_CRP_CMD_READ | (where & ~3);
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ar71xx_pcicfg_wr(PCI_REG_CRP_AD_CBE, t);
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data = ar71xx_pcicfg_rr(PCI_REG_CRP_RDDATA);
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DBG("PCI: rd local cfg, ad_cbe:%08x, data:%08x\n", t, data);
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} else {
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int err;
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err = ar71xx_pci_set_cfgaddr(bus, devfn, where, size,
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PCI_CFG_CMD_READ);
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if (err == 0) {
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data = ar71xx_pcicfg_rr(PCI_REG_CFG_RDDATA);
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} else {
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ret = PCIBIOS_DEVICE_NOT_FOUND;
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data = ~0;
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}
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}
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spin_unlock_irqrestore(&ar71xx_pci_lock, flags);
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DBG("PCI: read config: data=%08x raw=%08x\n",
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(data >> (8 * (where & 3))) & mask[size & 7], data);
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*value = (data >> (8 * (where & 3))) & mask[size & 7];
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return ret;
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}
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static int ar71xx_pci_write_config(struct pci_bus *bus, unsigned int devfn,
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int where, int size, u32 value)
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{
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unsigned long flags;
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int ret;
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DBG("PCI: write config: %02x:%02x.%01x/%02x:%01d value=%08x\n",
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bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn),
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where, size, value);
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value = value << (8 * (where & 3));
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ret = PCIBIOS_SUCCESSFUL;
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spin_lock_irqsave(&ar71xx_pci_lock, flags);
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if (bus->number == 0 && devfn == 0) {
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u32 t;
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t = PCI_CRP_CMD_WRITE | (where & ~3);
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t |= ar71xx_pci_get_ble(where, size, 1);
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DBG("PCI: wr local cfg, ad_cbe:%08x, value:%08x\n", t, value);
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ar71xx_pcicfg_wr(PCI_REG_CRP_AD_CBE, t);
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ar71xx_pcicfg_wr(PCI_REG_CRP_WRDATA, value);
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} else {
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int err;
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err = ar71xx_pci_set_cfgaddr(bus, devfn, where, size,
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PCI_CFG_CMD_WRITE);
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if (err == 0)
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ar71xx_pcicfg_wr(PCI_REG_CFG_WRDATA, value);
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else
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ret = PCIBIOS_DEVICE_NOT_FOUND;
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}
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spin_unlock_irqrestore(&ar71xx_pci_lock, flags);
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return ret;
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}
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static void ar71xx_pci_fixup(struct pci_dev *dev)
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{
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u32 t;
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if (dev->bus->number != 0 || dev->devfn != 0)
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return;
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DBG("PCI: fixup host controller %s (%04x:%04x)\n", pci_name(dev),
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dev->vendor, dev->device);
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/* setup COMMAND register */
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t = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE
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| PCI_COMMAND_PARITY | PCI_COMMAND_SERR | PCI_COMMAND_FAST_BACK;
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pci_write_config_word(dev, PCI_COMMAND, t);
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}
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DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, ar71xx_pci_fixup);
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int __init pcibios_map_irq(const struct pci_dev *dev, uint8_t slot, uint8_t pin)
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{
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int irq = -1;
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int i;
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slot -= PCI_IDSEL_ADL_START - PCI_IDSEL_BASE;
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for (i = 0; i < ar71xx_pci_nr_irqs; i++) {
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struct ar71xx_pci_irq *entry;
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entry = &ar71xx_pci_irq_map[i];
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if (entry->slot == slot && entry->pin == pin) {
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irq = entry->irq;
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break;
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}
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}
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if (irq < 0) {
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printk(KERN_ALERT "PCI: no irq found for pin%u@%s\n",
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pin, pci_name((struct pci_dev *)dev));
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} else {
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printk(KERN_INFO "PCI: mapping irq %d to pin%u@%s\n",
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irq, pin, pci_name((struct pci_dev *)dev));
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}
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return irq;
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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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static struct pci_ops ar71xx_pci_ops = {
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.read = ar71xx_pci_read_config,
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.write = ar71xx_pci_write_config,
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};
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static struct resource ar71xx_pci_io_resource = {
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.name = "PCI IO space",
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.start = 0,
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.end = 0,
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.flags = IORESOURCE_IO,
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};
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static struct resource ar71xx_pci_mem_resource = {
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.name = "PCI memory space",
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.start = AR71XX_PCI_MEM_BASE,
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.end = AR71XX_PCI_MEM_BASE + AR71XX_PCI_MEM_SIZE - 1,
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.flags = IORESOURCE_MEM
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};
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static struct pci_controller ar71xx_pci_controller = {
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.pci_ops = &ar71xx_pci_ops,
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.mem_resource = &ar71xx_pci_mem_resource,
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.io_resource = &ar71xx_pci_io_resource,
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};
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static int __init __ar71xx_pci_bios_init(unsigned nr_irqs,
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struct ar71xx_pci_irq *map)
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{
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ar71xx_device_stop(RESET_MODULE_PCI_BUS | RESET_MODULE_PCI_CORE);
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ar71xx_pci_delay();
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ar71xx_device_start(RESET_MODULE_PCI_BUS | RESET_MODULE_PCI_CORE);
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ar71xx_pci_delay();
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ar71xx_pcicfg_base = ioremap_nocache(AR71XX_PCI_CFG_BASE,
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AR71XX_PCI_CFG_SIZE);
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ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN0, PCI_WIN0_OFFS);
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ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN1, PCI_WIN1_OFFS);
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ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN2, PCI_WIN2_OFFS);
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ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN3, PCI_WIN3_OFFS);
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ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN4, PCI_WIN4_OFFS);
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ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN5, PCI_WIN5_OFFS);
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ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN6, PCI_WIN6_OFFS);
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ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN7, PCI_WIN7_OFFS);
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ar71xx_pci_delay();
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/* clear bus errors */
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(void)__ar71xx_pci_be_handler(1);
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ar71xx_pci_nr_irqs = nr_irqs;
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ar71xx_pci_irq_map = map;
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ar71xx_pci_be_handler = __ar71xx_pci_be_handler;
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register_pci_controller(&ar71xx_pci_controller);
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return 0;
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}
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static int __init __ar71xx_pci_init(void)
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{
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ar71xx_pci_bios_init = __ar71xx_pci_bios_init;
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return 0;
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}
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pure_initcall(__ar71xx_pci_init);
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