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>
20 #include <linux/interrupt.h>
22 #include <asm/mach-ar71xx/ar71xx.h>
23 #include <asm/mach-ar71xx/pci.h>
27 #define DBG(fmt, args...) printk(KERN_DEBUG fmt, ## args)
29 #define DBG(fmt, args...)
32 #define AR71XX_PCI_DELAY 100 /* msecs */
35 #define PCI_IDSEL_BASE PCI_IDSEL_ADL_START
37 #define PCI_IDSEL_BASE 0
40 static void __iomem *ar71xx_pcicfg_base;
41 static DEFINE_SPINLOCK(ar71xx_pci_lock);
42 static int ar71xx_pci_fixup_enable;
44 static inline void ar71xx_pci_delay(void)
46 mdelay(AR71XX_PCI_DELAY);
49 static inline u32 ar71xx_pcicfg_rr(unsigned int reg)
51 return __raw_readl(ar71xx_pcicfg_base + reg);
54 static inline void ar71xx_pcicfg_wr(unsigned int reg, u32 val)
56 __raw_writel(val, ar71xx_pcicfg_base + reg);
59 /* Byte lane enable bits */
60 static u8 ble_table[4][4] = {
67 static inline u32 ar71xx_pci_get_ble(int where, int size, int local)
71 t = ble_table[size & 3][where & 3];
73 t <<= (local) ? 20 : 4;
77 static inline u32 ar71xx_pci_bus_addr(struct pci_bus *bus, unsigned int devfn,
84 ret = (1 << (PCI_IDSEL_BASE + PCI_SLOT(devfn)))
85 | (PCI_FUNC(devfn) << 8) | (where & ~3);
88 ret = (bus->number << 16) | (PCI_SLOT(devfn) << 11)
89 | (PCI_FUNC(devfn) << 8) | (where & ~3) | 1;
95 int ar71xx_pci_be_handler(int is_fixup)
100 pci_err = ar71xx_pcicfg_rr(PCI_REG_PCI_ERR) & 3;
103 printk(KERN_ALERT "PCI error %d at PCI addr 0x%x\n",
105 ar71xx_pcicfg_rr(PCI_REG_PCI_ERR_ADDR));
107 ar71xx_pcicfg_wr(PCI_REG_PCI_ERR, pci_err);
110 ahb_err = ar71xx_pcicfg_rr(PCI_REG_AHB_ERR) & 1;
113 printk(KERN_ALERT "AHB error at AHB address 0x%x\n",
114 ar71xx_pcicfg_rr(PCI_REG_AHB_ERR_ADDR));
116 ar71xx_pcicfg_wr(PCI_REG_AHB_ERR, ahb_err);
119 return ((ahb_err | pci_err) ? 1 : 0);
122 static inline int ar71xx_pci_set_cfgaddr(struct pci_bus *bus,
123 unsigned int devfn, int where, int size, u32 cmd)
127 addr = ar71xx_pci_bus_addr(bus, devfn, where);
129 DBG("PCI: set cfgaddr: %02x:%02x.%01x/%02x:%01d, addr=%08x\n",
130 bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn),
133 ar71xx_pcicfg_wr(PCI_REG_CFG_AD, addr);
134 ar71xx_pcicfg_wr(PCI_REG_CFG_CBE,
135 cmd | ar71xx_pci_get_ble(where, size, 0));
137 return ar71xx_pci_be_handler(1);
140 static int ar71xx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
141 int where, int size, u32 *value)
143 static u32 mask[8] = {0, 0xff, 0xffff, 0, 0xffffffff, 0, 0, 0};
148 ret = PCIBIOS_SUCCESSFUL;
150 DBG("PCI: read config: %02x:%02x.%01x/%02x:%01d\n", bus->number,
151 PCI_SLOT(devfn), PCI_FUNC(devfn), where, size);
153 spin_lock_irqsave(&ar71xx_pci_lock, flags);
155 if (bus->number == 0 && devfn == 0) {
158 t = PCI_CRP_CMD_READ | (where & ~3);
160 ar71xx_pcicfg_wr(PCI_REG_CRP_AD_CBE, t);
161 data = ar71xx_pcicfg_rr(PCI_REG_CRP_RDDATA);
163 DBG("PCI: rd local cfg, ad_cbe:%08x, data:%08x\n", t, data);
168 err = ar71xx_pci_set_cfgaddr(bus, devfn, where, size,
172 data = ar71xx_pcicfg_rr(PCI_REG_CFG_RDDATA);
174 ret = PCIBIOS_DEVICE_NOT_FOUND;
179 spin_unlock_irqrestore(&ar71xx_pci_lock, flags);
181 DBG("PCI: read config: data=%08x raw=%08x\n",
182 (data >> (8 * (where & 3))) & mask[size & 7], data);
184 *value = (data >> (8 * (where & 3))) & mask[size & 7];
189 static int ar71xx_pci_write_config(struct pci_bus *bus, unsigned int devfn,
190 int where, int size, u32 value)
195 DBG("PCI: write config: %02x:%02x.%01x/%02x:%01d value=%08x\n",
196 bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn),
199 value = value << (8 * (where & 3));
200 ret = PCIBIOS_SUCCESSFUL;
202 spin_lock_irqsave(&ar71xx_pci_lock, flags);
203 if (bus->number == 0 && devfn == 0) {
206 t = PCI_CRP_CMD_WRITE | (where & ~3);
207 t |= ar71xx_pci_get_ble(where, size, 1);
209 DBG("PCI: wr local cfg, ad_cbe:%08x, value:%08x\n", t, value);
211 ar71xx_pcicfg_wr(PCI_REG_CRP_AD_CBE, t);
212 ar71xx_pcicfg_wr(PCI_REG_CRP_WRDATA, value);
216 err = ar71xx_pci_set_cfgaddr(bus, devfn, where, size,
220 ar71xx_pcicfg_wr(PCI_REG_CFG_WRDATA, value);
222 ret = PCIBIOS_DEVICE_NOT_FOUND;
224 spin_unlock_irqrestore(&ar71xx_pci_lock, flags);
229 static void ar71xx_pci_fixup(struct pci_dev *dev)
233 if (!ar71xx_pci_fixup_enable)
236 if (dev->bus->number != 0 || dev->devfn != 0)
239 DBG("PCI: fixup host controller %s (%04x:%04x)\n", pci_name(dev),
240 dev->vendor, dev->device);
242 /* setup COMMAND register */
243 t = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE
244 | PCI_COMMAND_PARITY | PCI_COMMAND_SERR | PCI_COMMAND_FAST_BACK;
246 pci_write_config_word(dev, PCI_COMMAND, t);
248 DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, ar71xx_pci_fixup);
250 int __init ar71xx_pcibios_map_irq(const struct pci_dev *dev, uint8_t slot,
256 slot -= PCI_IDSEL_ADL_START - PCI_IDSEL_BASE;
258 for (i = 0; i < ar71xx_pci_nr_irqs; i++) {
259 struct ar71xx_pci_irq *entry;
261 entry = &ar71xx_pci_irq_map[i];
262 if (entry->slot == slot && entry->pin == pin) {
269 printk(KERN_ALERT "PCI: no irq found for pin%u@%s\n",
270 pin, pci_name((struct pci_dev *)dev));
272 printk(KERN_INFO "PCI: mapping irq %d to pin%u@%s\n",
273 irq, pin, pci_name((struct pci_dev *)dev));
279 static struct pci_ops ar71xx_pci_ops = {
280 .read = ar71xx_pci_read_config,
281 .write = ar71xx_pci_write_config,
284 static struct resource ar71xx_pci_io_resource = {
285 .name = "PCI IO space",
288 .flags = IORESOURCE_IO,
291 static struct resource ar71xx_pci_mem_resource = {
292 .name = "PCI memory space",
293 .start = AR71XX_PCI_MEM_BASE,
294 .end = AR71XX_PCI_MEM_BASE + AR71XX_PCI_MEM_SIZE - 1,
295 .flags = IORESOURCE_MEM
298 static struct pci_controller ar71xx_pci_controller = {
299 .pci_ops = &ar71xx_pci_ops,
300 .mem_resource = &ar71xx_pci_mem_resource,
301 .io_resource = &ar71xx_pci_io_resource,
304 static void ar71xx_pci_irq_handler(unsigned int irq, struct irq_desc *desc)
308 pending = ar71xx_reset_rr(AR71XX_RESET_REG_PCI_INT_STATUS) &
309 ar71xx_reset_rr(AR71XX_RESET_REG_PCI_INT_ENABLE);
311 if (pending & PCI_INT_DEV0)
312 generic_handle_irq(AR71XX_PCI_IRQ_DEV0);
314 else if (pending & PCI_INT_DEV1)
315 generic_handle_irq(AR71XX_PCI_IRQ_DEV1);
317 else if (pending & PCI_INT_DEV2)
318 generic_handle_irq(AR71XX_PCI_IRQ_DEV2);
320 else if (pending & PCI_INT_CORE)
321 generic_handle_irq(AR71XX_PCI_IRQ_CORE);
324 spurious_interrupt();
327 static void ar71xx_pci_irq_unmask(unsigned int irq)
329 irq -= AR71XX_PCI_IRQ_BASE;
330 ar71xx_reset_wr(AR71XX_RESET_REG_PCI_INT_ENABLE,
331 ar71xx_reset_rr(AR71XX_RESET_REG_PCI_INT_ENABLE) | (1 << irq));
334 ar71xx_reset_rr(AR71XX_RESET_REG_PCI_INT_ENABLE);
337 static void ar71xx_pci_irq_mask(unsigned int irq)
339 irq -= AR71XX_PCI_IRQ_BASE;
340 ar71xx_reset_wr(AR71XX_RESET_REG_PCI_INT_ENABLE,
341 ar71xx_reset_rr(AR71XX_RESET_REG_PCI_INT_ENABLE) & ~(1 << irq));
344 ar71xx_reset_rr(AR71XX_RESET_REG_PCI_INT_ENABLE);
347 static struct irq_chip ar71xx_pci_irq_chip = {
348 .name = "AR71XX PCI ",
349 .mask = ar71xx_pci_irq_mask,
350 .unmask = ar71xx_pci_irq_unmask,
351 .mask_ack = ar71xx_pci_irq_mask,
354 static void __init ar71xx_pci_irq_init(void)
358 ar71xx_reset_wr(AR71XX_RESET_REG_PCI_INT_ENABLE, 0);
359 ar71xx_reset_wr(AR71XX_RESET_REG_PCI_INT_STATUS, 0);
361 for (i = AR71XX_PCI_IRQ_BASE;
362 i < AR71XX_PCI_IRQ_BASE + AR71XX_PCI_IRQ_COUNT; i++) {
363 irq_desc[i].status = IRQ_DISABLED;
364 set_irq_chip_and_handler(i, &ar71xx_pci_irq_chip,
368 set_irq_chained_handler(AR71XX_CPU_IRQ_IP2, ar71xx_pci_irq_handler);
371 int __init ar71xx_pcibios_init(void)
373 ar71xx_device_stop(RESET_MODULE_PCI_BUS | RESET_MODULE_PCI_CORE);
376 ar71xx_device_start(RESET_MODULE_PCI_BUS | RESET_MODULE_PCI_CORE);
379 ar71xx_pcicfg_base = ioremap_nocache(AR71XX_PCI_CFG_BASE,
380 AR71XX_PCI_CFG_SIZE);
382 ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN0, PCI_WIN0_OFFS);
383 ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN1, PCI_WIN1_OFFS);
384 ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN2, PCI_WIN2_OFFS);
385 ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN3, PCI_WIN3_OFFS);
386 ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN4, PCI_WIN4_OFFS);
387 ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN5, PCI_WIN5_OFFS);
388 ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN6, PCI_WIN6_OFFS);
389 ar71xx_ddr_wr(AR71XX_DDR_REG_PCI_WIN7, PCI_WIN7_OFFS);
393 /* clear bus errors */
394 (void)ar71xx_pci_be_handler(1);
396 ar71xx_pci_fixup_enable = 1;
397 ar71xx_pci_irq_init();
398 register_pci_controller(&ar71xx_pci_controller);