2 * Atheros AR71xx PCI host controller driver
4 * Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
5 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
7 * Parts of this file are based on Atheros' 2.6.15 BSP
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License version 2 as published
11 * by the Free Software Foundation.
14 #include <linux/resource.h>
15 #include <linux/types.h>
16 #include <linux/delay.h>
17 #include <linux/bitops.h>
18 #include <linux/pci.h>
19 #include <linux/pci_regs.h>
21 #include <asm/mach-ar71xx/ar71xx.h>
22 #include <asm/mach-ar71xx/pci.h>
26 #define DBG(fmt, args...) printk(KERN_DEBUG fmt, ## args)
28 #define DBG(fmt, args...)
31 #define AR71XX_PCI_DELAY 100 /* msecs */
34 #define PCI_IDSEL_BASE PCI_IDSEL_ADL_START
36 #define PCI_IDSEL_BASE 0
39 static void __iomem *ar71xx_pcicfg_base;
40 static DEFINE_SPINLOCK(ar71xx_pci_lock);
42 static inline void ar71xx_pci_delay(void)
44 mdelay(AR71XX_PCI_DELAY);
47 static inline u32 ar71xx_pcicfg_rr(unsigned int reg)
49 return __raw_readl(ar71xx_pcicfg_base + reg);
52 static inline void ar71xx_pcicfg_wr(unsigned int reg, u32 val)
54 __raw_writel(val, ar71xx_pcicfg_base + reg);
57 /* Byte lane enable bits */
58 static u8 ble_table[4][4] = {
65 static inline u32 ar71xx_pci_get_ble(int where, int size, int local)
69 t = ble_table[size & 3][where & 3];
71 t <<= (local) ? 20 : 4;
75 static inline u32 ar71xx_pci_bus_addr(struct pci_bus *bus, unsigned int devfn,
82 ret = (1 << (PCI_IDSEL_BASE + PCI_SLOT(devfn)))
83 | (PCI_FUNC(devfn) << 8) | (where & ~3);
86 ret = (bus->number << 16) | (PCI_SLOT(devfn) << 11)
87 | (PCI_FUNC(devfn) << 8) | (where & ~3) | 1;
93 int ar71xx_pci_be_handler(int is_fixup)
98 pci_err = ar71xx_pcicfg_rr(PCI_REG_PCI_ERR) & 3;
101 printk(KERN_ALERT "PCI error %d at PCI addr 0x%x\n",
103 ar71xx_pcicfg_rr(PCI_REG_PCI_ERR_ADDR));
105 ar71xx_pcicfg_wr(PCI_REG_PCI_ERR, pci_err);
108 ahb_err = ar71xx_pcicfg_rr(PCI_REG_AHB_ERR) & 1;
111 printk(KERN_ALERT "AHB error at AHB address 0x%x\n",
112 ar71xx_pcicfg_rr(PCI_REG_AHB_ERR_ADDR));
114 ar71xx_pcicfg_wr(PCI_REG_AHB_ERR, ahb_err);
117 return ((ahb_err | pci_err) ? 1 : 0);
120 static inline int ar71xx_pci_set_cfgaddr(struct pci_bus *bus,
121 unsigned int devfn, int where, int size, u32 cmd)
125 addr = ar71xx_pci_bus_addr(bus, devfn, where);
127 DBG("PCI: set cfgaddr: %02x:%02x.%01x/%02x:%01d, addr=%08x\n",
128 bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn),
131 ar71xx_pcicfg_wr(PCI_REG_CFG_AD, addr);
132 ar71xx_pcicfg_wr(PCI_REG_CFG_CBE,
133 cmd | ar71xx_pci_get_ble(where, size, 0));
135 return ar71xx_pci_be_handler(1);
138 static int ar71xx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
139 int where, int size, u32 *value)
141 static u32 mask[8] = {0, 0xff, 0xffff, 0, 0xffffffff, 0, 0, 0};
146 ret = PCIBIOS_SUCCESSFUL;
148 DBG("PCI: read config: %02x:%02x.%01x/%02x:%01d\n", bus->number,
149 PCI_SLOT(devfn), PCI_FUNC(devfn), where, size);
151 spin_lock_irqsave(&ar71xx_pci_lock, flags);
153 if (bus->number == 0 && devfn == 0) {
156 t = PCI_CRP_CMD_READ | (where & ~3);
158 ar71xx_pcicfg_wr(PCI_REG_CRP_AD_CBE, t);
159 data = ar71xx_pcicfg_rr(PCI_REG_CRP_RDDATA);
161 DBG("PCI: rd local cfg, ad_cbe:%08x, data:%08x\n", t, data);
166 err = ar71xx_pci_set_cfgaddr(bus, devfn, where, size,
170 data = ar71xx_pcicfg_rr(PCI_REG_CFG_RDDATA);
172 ret = PCIBIOS_DEVICE_NOT_FOUND;
177 spin_unlock_irqrestore(&ar71xx_pci_lock, flags);
179 DBG("PCI: read config: data=%08x raw=%08x\n",
180 (data >> (8 * (where & 3))) & mask[size & 7], data);
182 *value = (data >> (8 * (where & 3))) & mask[size & 7];
187 static int ar71xx_pci_write_config(struct pci_bus *bus, unsigned int devfn,
188 int where, int size, u32 value)
193 DBG("PCI: write config: %02x:%02x.%01x/%02x:%01d value=%08x\n",
194 bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn),
197 value = value << (8 * (where & 3));
198 ret = PCIBIOS_SUCCESSFUL;
200 spin_lock_irqsave(&ar71xx_pci_lock, flags);
201 if (bus->number == 0 && devfn == 0) {
204 t = PCI_CRP_CMD_WRITE | (where & ~3);
205 t |= ar71xx_pci_get_ble(where, size, 1);
207 DBG("PCI: wr local cfg, ad_cbe:%08x, value:%08x\n", t, value);
209 ar71xx_pcicfg_wr(PCI_REG_CRP_AD_CBE, t);
210 ar71xx_pcicfg_wr(PCI_REG_CRP_WRDATA, value);
214 err = ar71xx_pci_set_cfgaddr(bus, devfn, where, size,
218 ar71xx_pcicfg_wr(PCI_REG_CFG_WRDATA, value);
220 ret = PCIBIOS_DEVICE_NOT_FOUND;
222 spin_unlock_irqrestore(&ar71xx_pci_lock, flags);
227 static void ar71xx_pci_fixup(struct pci_dev *dev)
231 if (dev->bus->number != 0 || dev->devfn != 0)
234 DBG("PCI: fixup host controller %s (%04x:%04x)\n", pci_name(dev),
235 dev->vendor, dev->device);
237 /* setup COMMAND register */
238 t = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE
239 | PCI_COMMAND_PARITY | PCI_COMMAND_SERR | PCI_COMMAND_FAST_BACK;
241 pci_write_config_word(dev, PCI_COMMAND, t);
243 DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, ar71xx_pci_fixup);
245 int __init ar71xx_pcibios_map_irq(const struct pci_dev *dev, uint8_t slot,
251 slot -= PCI_IDSEL_ADL_START - PCI_IDSEL_BASE;
253 for (i = 0; i < ar71xx_pci_nr_irqs; i++) {
254 struct ar71xx_pci_irq *entry;
256 entry = &ar71xx_pci_irq_map[i];
257 if (entry->slot == slot && entry->pin == pin) {
264 printk(KERN_ALERT "PCI: no irq found for pin%u@%s\n",
265 pin, pci_name((struct pci_dev *)dev));
267 printk(KERN_INFO "PCI: mapping irq %d to pin%u@%s\n",
268 irq, pin, pci_name((struct pci_dev *)dev));
274 static struct pci_ops ar71xx_pci_ops = {
275 .read = ar71xx_pci_read_config,
276 .write = ar71xx_pci_write_config,
279 static struct resource ar71xx_pci_io_resource = {
280 .name = "PCI IO space",
283 .flags = IORESOURCE_IO,
286 static struct resource ar71xx_pci_mem_resource = {
287 .name = "PCI memory space",
288 .start = AR71XX_PCI_MEM_BASE,
289 .end = AR71XX_PCI_MEM_BASE + AR71XX_PCI_MEM_SIZE - 1,
290 .flags = IORESOURCE_MEM
293 static struct pci_controller ar71xx_pci_controller = {
294 .pci_ops = &ar71xx_pci_ops,
295 .mem_resource = &ar71xx_pci_mem_resource,
296 .io_resource = &ar71xx_pci_io_resource,
299 int __init ar71xx_pcibios_init(void)
301 ar71xx_device_stop(RESET_MODULE_PCI_BUS | RESET_MODULE_PCI_CORE);
304 ar71xx_device_start(RESET_MODULE_PCI_BUS | RESET_MODULE_PCI_CORE);
307 ar71xx_pcicfg_base = ioremap_nocache(AR71XX_PCI_CFG_BASE,
308 AR71XX_PCI_CFG_SIZE);
310 ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN0, PCI_WIN0_OFFS);
311 ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN1, PCI_WIN1_OFFS);
312 ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN2, PCI_WIN2_OFFS);
313 ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN3, PCI_WIN3_OFFS);
314 ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN4, PCI_WIN4_OFFS);
315 ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN5, PCI_WIN5_OFFS);
316 ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN6, PCI_WIN6_OFFS);
317 ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN7, PCI_WIN7_OFFS);
321 /* clear bus errors */
322 (void)ar71xx_pci_be_handler(1);
324 register_pci_controller(&ar71xx_pci_controller);