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ar71xx: reset the mdio bus on ar7241/ar7242
[openwrt.git] / target / linux / ar71xx / files / arch / mips / pci / pci-ar71xx.c
1 /*
2 * Atheros AR71xx PCI host controller driver
3 *
4 * Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
5 * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
6 *
7 * Parts of this file are based on Atheros' 2.6.15 BSP
8 *
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.
12 */
13
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>
21
22 #include <asm/mach-ar71xx/ar71xx.h>
23 #include <asm/mach-ar71xx/pci.h>
24
25 #undef DEBUG
26 #ifdef DEBUG
27 #define DBG(fmt, args...) printk(KERN_DEBUG fmt, ## args)
28 #else
29 #define DBG(fmt, args...)
30 #endif
31
32 #define AR71XX_PCI_DELAY 100 /* msecs */
33
34 #if 0
35 #define PCI_IDSEL_BASE PCI_IDSEL_ADL_START
36 #else
37 #define PCI_IDSEL_BASE 0
38 #endif
39
40 static void __iomem *ar71xx_pcicfg_base;
41 static DEFINE_SPINLOCK(ar71xx_pci_lock);
42 static int ar71xx_pci_fixup_enable;
43
44 static inline void ar71xx_pci_delay(void)
45 {
46 mdelay(AR71XX_PCI_DELAY);
47 }
48
49 /* Byte lane enable bits */
50 static u8 ble_table[4][4] = {
51 {0x0, 0xf, 0xf, 0xf},
52 {0xe, 0xd, 0xb, 0x7},
53 {0xc, 0xf, 0x3, 0xf},
54 {0xf, 0xf, 0xf, 0xf},
55 };
56
57 static inline u32 ar71xx_pci_get_ble(int where, int size, int local)
58 {
59 u32 t;
60
61 t = ble_table[size & 3][where & 3];
62 BUG_ON(t == 0xf);
63 t <<= (local) ? 20 : 4;
64 return t;
65 }
66
67 static inline u32 ar71xx_pci_bus_addr(struct pci_bus *bus, unsigned int devfn,
68 int where)
69 {
70 u32 ret;
71
72 if (!bus->number) {
73 /* type 0 */
74 ret = (1 << (PCI_IDSEL_BASE + PCI_SLOT(devfn)))
75 | (PCI_FUNC(devfn) << 8) | (where & ~3);
76 } else {
77 /* type 1 */
78 ret = (bus->number << 16) | (PCI_SLOT(devfn) << 11)
79 | (PCI_FUNC(devfn) << 8) | (where & ~3) | 1;
80 }
81
82 return ret;
83 }
84
85 int ar71xx_pci_be_handler(int is_fixup)
86 {
87 void __iomem *base = ar71xx_pcicfg_base;
88 u32 pci_err;
89 u32 ahb_err;
90
91 pci_err = __raw_readl(base + PCI_REG_PCI_ERR) & 3;
92 if (pci_err) {
93 if (!is_fixup)
94 printk(KERN_ALERT "PCI error %d at PCI addr 0x%x\n",
95 pci_err,
96 __raw_readl(base + PCI_REG_PCI_ERR_ADDR));
97
98 __raw_writel(pci_err, base + PCI_REG_PCI_ERR);
99 }
100
101 ahb_err = __raw_readl(base + PCI_REG_AHB_ERR) & 1;
102 if (ahb_err) {
103 if (!is_fixup)
104 printk(KERN_ALERT "AHB error at AHB address 0x%x\n",
105 __raw_readl(base + PCI_REG_AHB_ERR_ADDR));
106
107 __raw_writel(ahb_err, base + PCI_REG_AHB_ERR);
108 }
109
110 return ((ahb_err | pci_err) ? 1 : 0);
111 }
112
113 static inline int ar71xx_pci_set_cfgaddr(struct pci_bus *bus,
114 unsigned int devfn, int where, int size, u32 cmd)
115 {
116 void __iomem *base = ar71xx_pcicfg_base;
117 u32 addr;
118
119 addr = ar71xx_pci_bus_addr(bus, devfn, where);
120
121 DBG("PCI: set cfgaddr: %02x:%02x.%01x/%02x:%01d, addr=%08x\n",
122 bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn),
123 where, size, addr);
124
125 __raw_writel(addr, base + PCI_REG_CFG_AD);
126 __raw_writel(cmd | ar71xx_pci_get_ble(where, size, 0),
127 base + PCI_REG_CFG_CBE);
128
129 return ar71xx_pci_be_handler(1);
130 }
131
132 static int ar71xx_pci_read_config(struct pci_bus *bus, unsigned int devfn,
133 int where, int size, u32 *value)
134 {
135 void __iomem *base = ar71xx_pcicfg_base;
136 static u32 mask[8] = {0, 0xff, 0xffff, 0, 0xffffffff, 0, 0, 0};
137 unsigned long flags;
138 u32 data;
139 int ret;
140
141 ret = PCIBIOS_SUCCESSFUL;
142
143 DBG("PCI: read config: %02x:%02x.%01x/%02x:%01d\n", bus->number,
144 PCI_SLOT(devfn), PCI_FUNC(devfn), where, size);
145
146 spin_lock_irqsave(&ar71xx_pci_lock, flags);
147
148 if (bus->number == 0 && devfn == 0) {
149 u32 t;
150
151 t = PCI_CRP_CMD_READ | (where & ~3);
152
153 __raw_writel(t, base + PCI_REG_CRP_AD_CBE);
154 data = __raw_readl(base + PCI_REG_CRP_RDDATA);
155
156 DBG("PCI: rd local cfg, ad_cbe:%08x, data:%08x\n", t, data);
157
158 } else {
159 int err;
160
161 err = ar71xx_pci_set_cfgaddr(bus, devfn, where, size,
162 PCI_CFG_CMD_READ);
163
164 if (err == 0) {
165 data = __raw_readl(base + PCI_REG_CFG_RDDATA);
166 } else {
167 ret = PCIBIOS_DEVICE_NOT_FOUND;
168 data = ~0;
169 }
170 }
171
172 spin_unlock_irqrestore(&ar71xx_pci_lock, flags);
173
174 DBG("PCI: read config: data=%08x raw=%08x\n",
175 (data >> (8 * (where & 3))) & mask[size & 7], data);
176
177 *value = (data >> (8 * (where & 3))) & mask[size & 7];
178
179 return ret;
180 }
181
182 static int ar71xx_pci_write_config(struct pci_bus *bus, unsigned int devfn,
183 int where, int size, u32 value)
184 {
185 void __iomem *base = ar71xx_pcicfg_base;
186 unsigned long flags;
187 int ret;
188
189 DBG("PCI: write config: %02x:%02x.%01x/%02x:%01d value=%08x\n",
190 bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn),
191 where, size, value);
192
193 value = value << (8 * (where & 3));
194 ret = PCIBIOS_SUCCESSFUL;
195
196 spin_lock_irqsave(&ar71xx_pci_lock, flags);
197 if (bus->number == 0 && devfn == 0) {
198 u32 t;
199
200 t = PCI_CRP_CMD_WRITE | (where & ~3);
201 t |= ar71xx_pci_get_ble(where, size, 1);
202
203 DBG("PCI: wr local cfg, ad_cbe:%08x, value:%08x\n", t, value);
204
205 __raw_writel(t, base + PCI_REG_CRP_AD_CBE);
206 __raw_writel(value, base + PCI_REG_CRP_WRDATA);
207 } else {
208 int err;
209
210 err = ar71xx_pci_set_cfgaddr(bus, devfn, where, size,
211 PCI_CFG_CMD_WRITE);
212
213 if (err == 0)
214 __raw_writel(value, base + PCI_REG_CFG_WRDATA);
215 else
216 ret = PCIBIOS_DEVICE_NOT_FOUND;
217 }
218 spin_unlock_irqrestore(&ar71xx_pci_lock, flags);
219
220 return ret;
221 }
222
223 static void ar71xx_pci_fixup(struct pci_dev *dev)
224 {
225 u32 t;
226
227 if (!ar71xx_pci_fixup_enable)
228 return;
229
230 if (dev->bus->number != 0 || dev->devfn != 0)
231 return;
232
233 DBG("PCI: fixup host controller %s (%04x:%04x)\n", pci_name(dev),
234 dev->vendor, dev->device);
235
236 /* setup COMMAND register */
237 t = PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE
238 | PCI_COMMAND_PARITY | PCI_COMMAND_SERR | PCI_COMMAND_FAST_BACK;
239
240 pci_write_config_word(dev, PCI_COMMAND, t);
241 }
242 DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, ar71xx_pci_fixup);
243
244 int __init ar71xx_pcibios_map_irq(const struct pci_dev *dev, uint8_t slot,
245 uint8_t pin)
246 {
247 int irq = -1;
248 int i;
249
250 slot -= PCI_IDSEL_ADL_START - PCI_IDSEL_BASE;
251
252 for (i = 0; i < ar71xx_pci_nr_irqs; i++) {
253 struct ar71xx_pci_irq *entry;
254
255 entry = &ar71xx_pci_irq_map[i];
256 if (entry->slot == slot && entry->pin == pin) {
257 irq = entry->irq;
258 break;
259 }
260 }
261
262 if (irq < 0) {
263 printk(KERN_ALERT "PCI: no irq found for pin%u@%s\n",
264 pin, pci_name((struct pci_dev *)dev));
265 } else {
266 printk(KERN_INFO "PCI: mapping irq %d to pin%u@%s\n",
267 irq, pin, pci_name((struct pci_dev *)dev));
268 }
269
270 return irq;
271 }
272
273 static struct pci_ops ar71xx_pci_ops = {
274 .read = ar71xx_pci_read_config,
275 .write = ar71xx_pci_write_config,
276 };
277
278 static struct resource ar71xx_pci_io_resource = {
279 .name = "PCI IO space",
280 .start = 0,
281 .end = 0,
282 .flags = IORESOURCE_IO,
283 };
284
285 static struct resource ar71xx_pci_mem_resource = {
286 .name = "PCI memory space",
287 .start = AR71XX_PCI_MEM_BASE,
288 .end = AR71XX_PCI_MEM_BASE + AR71XX_PCI_MEM_SIZE - 1,
289 .flags = IORESOURCE_MEM
290 };
291
292 static struct pci_controller ar71xx_pci_controller = {
293 .pci_ops = &ar71xx_pci_ops,
294 .mem_resource = &ar71xx_pci_mem_resource,
295 .io_resource = &ar71xx_pci_io_resource,
296 };
297
298 static void ar71xx_pci_irq_handler(unsigned int irq, struct irq_desc *desc)
299 {
300 void __iomem *base = ar71xx_reset_base;
301 u32 pending;
302
303 pending = __raw_readl(base + AR71XX_RESET_REG_PCI_INT_STATUS) &
304 __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
305
306 if (pending & PCI_INT_DEV0)
307 generic_handle_irq(AR71XX_PCI_IRQ_DEV0);
308
309 else if (pending & PCI_INT_DEV1)
310 generic_handle_irq(AR71XX_PCI_IRQ_DEV1);
311
312 else if (pending & PCI_INT_DEV2)
313 generic_handle_irq(AR71XX_PCI_IRQ_DEV2);
314
315 else if (pending & PCI_INT_CORE)
316 generic_handle_irq(AR71XX_PCI_IRQ_CORE);
317
318 else
319 spurious_interrupt();
320 }
321
322 static void ar71xx_pci_irq_unmask(unsigned int irq)
323 {
324 void __iomem *base = ar71xx_reset_base;
325 u32 t;
326
327 irq -= AR71XX_PCI_IRQ_BASE;
328
329 t = __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
330 __raw_writel(t | (1 << irq), base + AR71XX_RESET_REG_PCI_INT_ENABLE);
331
332 /* flush write */
333 (void) __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
334 }
335
336 static void ar71xx_pci_irq_mask(unsigned int irq)
337 {
338 void __iomem *base = ar71xx_reset_base;
339 u32 t;
340
341 irq -= AR71XX_PCI_IRQ_BASE;
342
343 t = __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
344 __raw_writel(t & ~(1 << irq), base + AR71XX_RESET_REG_PCI_INT_ENABLE);
345
346 /* flush write */
347 (void) __raw_readl(base + AR71XX_RESET_REG_PCI_INT_ENABLE);
348 }
349
350 static struct irq_chip ar71xx_pci_irq_chip = {
351 .name = "AR71XX PCI ",
352 .mask = ar71xx_pci_irq_mask,
353 .unmask = ar71xx_pci_irq_unmask,
354 .mask_ack = ar71xx_pci_irq_mask,
355 };
356
357 static void __init ar71xx_pci_irq_init(void)
358 {
359 void __iomem *base = ar71xx_reset_base;
360 int i;
361
362 __raw_writel(0, base + AR71XX_RESET_REG_PCI_INT_ENABLE);
363 __raw_writel(0, base + AR71XX_RESET_REG_PCI_INT_STATUS);
364
365 for (i = AR71XX_PCI_IRQ_BASE;
366 i < AR71XX_PCI_IRQ_BASE + AR71XX_PCI_IRQ_COUNT; i++) {
367 irq_desc[i].status = IRQ_DISABLED;
368 set_irq_chip_and_handler(i, &ar71xx_pci_irq_chip,
369 handle_level_irq);
370 }
371
372 set_irq_chained_handler(AR71XX_CPU_IRQ_IP2, ar71xx_pci_irq_handler);
373 }
374
375 int __init ar71xx_pcibios_init(void)
376 {
377 void __iomem *ddr_base = ar71xx_ddr_base;
378
379 ar71xx_device_stop(RESET_MODULE_PCI_BUS | RESET_MODULE_PCI_CORE);
380 ar71xx_pci_delay();
381
382 ar71xx_device_start(RESET_MODULE_PCI_BUS | RESET_MODULE_PCI_CORE);
383 ar71xx_pci_delay();
384
385 ar71xx_pcicfg_base = ioremap_nocache(AR71XX_PCI_CFG_BASE,
386 AR71XX_PCI_CFG_SIZE);
387 if (ar71xx_pcicfg_base == NULL)
388 return -ENOMEM;
389
390 __raw_writel(PCI_WIN0_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN0);
391 __raw_writel(PCI_WIN1_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN1);
392 __raw_writel(PCI_WIN2_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN2);
393 __raw_writel(PCI_WIN3_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN3);
394 __raw_writel(PCI_WIN4_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN4);
395 __raw_writel(PCI_WIN5_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN5);
396 __raw_writel(PCI_WIN6_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN6);
397 __raw_writel(PCI_WIN7_OFFS, ddr_base + AR71XX_DDR_REG_PCI_WIN7);
398
399 ar71xx_pci_delay();
400
401 /* clear bus errors */
402 (void)ar71xx_pci_be_handler(1);
403
404 ar71xx_pci_fixup_enable = 1;
405 ar71xx_pci_irq_init();
406 register_pci_controller(&ar71xx_pci_controller);
407
408 return 0;
409 }
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