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1/*
2 * Alchemy PCI host mode support.
3 *
4 * Copyright 2001-2003, 2007-2008 MontaVista Software Inc.
5 * Author: MontaVista Software, Inc. <source@mvista.com>
6 *
7 * Support for all devices (greater than 16) added by David Gathright.
8 */
9
10#include <linux/export.h>
11#include <linux/types.h>
12#include <linux/pci.h>
13#include <linux/platform_device.h>
14#include <linux/kernel.h>
15#include <linux/init.h>
16#include <linux/syscore_ops.h>
17#include <linux/vmalloc.h>
18
19#include <asm/dma-coherence.h>
20#include <asm/mach-au1x00/au1000.h>
21#include <asm/tlbmisc.h>
22
23#ifdef CONFIG_PCI_DEBUG
24#define DBG(x...) printk(KERN_DEBUG x)
25#else
26#define DBG(x...) do {} while (0)
27#endif
28
29#define PCI_ACCESS_READ 0
30#define PCI_ACCESS_WRITE 1
31
32struct alchemy_pci_context {
33 struct pci_controller alchemy_pci_ctrl; /* leave as first member! */
34 void __iomem *regs; /* ctrl base */
35 /* tools for wired entry for config space access */
36 unsigned long last_elo0;
37 unsigned long last_elo1;
38 int wired_entry;
39 struct vm_struct *pci_cfg_vm;
40
41 unsigned long pm[12];
42
43 int (*board_map_irq)(const struct pci_dev *d, u8 slot, u8 pin);
44 int (*board_pci_idsel)(unsigned int devsel, int assert);
45};
46
47/* for syscore_ops. There's only one PCI controller on Alchemy chips, so this
48 * should suffice for now.
49 */
50static struct alchemy_pci_context *__alchemy_pci_ctx;
51
52
53/* IO/MEM resources for PCI. Keep the memres in sync with __fixup_bigphys_addr
54 * in arch/mips/alchemy/common/setup.c
55 */
56static struct resource alchemy_pci_def_memres = {
57 .start = ALCHEMY_PCI_MEMWIN_START,
58 .end = ALCHEMY_PCI_MEMWIN_END,
59 .name = "PCI memory space",
60 .flags = IORESOURCE_MEM
61};
62
63static struct resource alchemy_pci_def_iores = {
64 .start = ALCHEMY_PCI_IOWIN_START,
65 .end = ALCHEMY_PCI_IOWIN_END,
66 .name = "PCI IO space",
67 .flags = IORESOURCE_IO
68};
69
70static void mod_wired_entry(int entry, unsigned long entrylo0,
71 unsigned long entrylo1, unsigned long entryhi,
72 unsigned long pagemask)
73{
74 unsigned long old_pagemask;
75 unsigned long old_ctx;
76
77 /* Save old context and create impossible VPN2 value */
78 old_ctx = read_c0_entryhi() & 0xff;
79 old_pagemask = read_c0_pagemask();
80 write_c0_index(entry);
81 write_c0_pagemask(pagemask);
82 write_c0_entryhi(entryhi);
83 write_c0_entrylo0(entrylo0);
84 write_c0_entrylo1(entrylo1);
85 tlb_write_indexed();
86 write_c0_entryhi(old_ctx);
87 write_c0_pagemask(old_pagemask);
88}
89
90static void alchemy_pci_wired_entry(struct alchemy_pci_context *ctx)
91{
92 ctx->wired_entry = read_c0_wired();
93 add_wired_entry(0, 0, (unsigned long)ctx->pci_cfg_vm->addr, PM_4K);
94 ctx->last_elo0 = ctx->last_elo1 = ~0;
95}
96
97static int config_access(unsigned char access_type, struct pci_bus *bus,
98 unsigned int dev_fn, unsigned char where, u32 *data)
99{
100 struct alchemy_pci_context *ctx = bus->sysdata;
101 unsigned int device = PCI_SLOT(dev_fn);
102 unsigned int function = PCI_FUNC(dev_fn);
103 unsigned long offset, status, cfg_base, flags, entryLo0, entryLo1, r;
104 int error = PCIBIOS_SUCCESSFUL;
105
106 if (device > 19) {
107 *data = 0xffffffff;
108 return -1;
109 }
110
111 local_irq_save(flags);
112 r = __raw_readl(ctx->regs + PCI_REG_STATCMD) & 0x0000ffff;
113 r |= PCI_STATCMD_STATUS(0x2000);
114 __raw_writel(r, ctx->regs + PCI_REG_STATCMD);
115 wmb();
116
117 /* Allow board vendors to implement their own off-chip IDSEL.
118 * If it doesn't succeed, may as well bail out at this point.
119 */
120 if (ctx->board_pci_idsel(device, 1) == 0) {
121 *data = 0xffffffff;
122 local_irq_restore(flags);
123 return -1;
124 }
125
126 /* Setup the config window */
127 if (bus->number == 0)
128 cfg_base = (1 << device) << 11;
129 else
130 cfg_base = 0x80000000 | (bus->number << 16) | (device << 11);
131
132 /* Setup the lower bits of the 36-bit address */
133 offset = (function << 8) | (where & ~0x3);
134 /* Pick up any address that falls below the page mask */
135 offset |= cfg_base & ~PAGE_MASK;
136
137 /* Page boundary */
138 cfg_base = cfg_base & PAGE_MASK;
139
140 /* To improve performance, if the current device is the same as
141 * the last device accessed, we don't touch the TLB.
142 */
143 entryLo0 = (6 << 26) | (cfg_base >> 6) | (2 << 3) | 7;
144 entryLo1 = (6 << 26) | (cfg_base >> 6) | (0x1000 >> 6) | (2 << 3) | 7;
145 if ((entryLo0 != ctx->last_elo0) || (entryLo1 != ctx->last_elo1)) {
146 mod_wired_entry(ctx->wired_entry, entryLo0, entryLo1,
147 (unsigned long)ctx->pci_cfg_vm->addr, PM_4K);
148 ctx->last_elo0 = entryLo0;
149 ctx->last_elo1 = entryLo1;
150 }
151
152 if (access_type == PCI_ACCESS_WRITE)
153 __raw_writel(*data, ctx->pci_cfg_vm->addr + offset);
154 else
155 *data = __raw_readl(ctx->pci_cfg_vm->addr + offset);
156 wmb();
157
158 DBG("alchemy-pci: cfg access %d bus %u dev %u at %x dat %x conf %lx\n",
159 access_type, bus->number, device, where, *data, offset);
160
161 /* check for errors, master abort */
162 status = __raw_readl(ctx->regs + PCI_REG_STATCMD);
163 if (status & (1 << 29)) {
164 *data = 0xffffffff;
165 error = -1;
166 DBG("alchemy-pci: master abort on cfg access %d bus %d dev %d\n",
167 access_type, bus->number, device);
168 } else if ((status >> 28) & 0xf) {
169 DBG("alchemy-pci: PCI ERR detected: dev %d, status %lx\n",
170 device, (status >> 28) & 0xf);
171
172 /* clear errors */
173 __raw_writel(status & 0xf000ffff, ctx->regs + PCI_REG_STATCMD);
174
175 *data = 0xffffffff;
176 error = -1;
177 }
178
179 /* Take away the IDSEL. */
180 (void)ctx->board_pci_idsel(device, 0);
181
182 local_irq_restore(flags);
183 return error;
184}
185
186static int read_config_byte(struct pci_bus *bus, unsigned int devfn,
187 int where, u8 *val)
188{
189 u32 data;
190 int ret = config_access(PCI_ACCESS_READ, bus, devfn, where, &data);
191
192 if (where & 1)
193 data >>= 8;
194 if (where & 2)
195 data >>= 16;
196 *val = data & 0xff;
197 return ret;
198}
199
200static int read_config_word(struct pci_bus *bus, unsigned int devfn,
201 int where, u16 *val)
202{
203 u32 data;
204 int ret = config_access(PCI_ACCESS_READ, bus, devfn, where, &data);
205
206 if (where & 2)
207 data >>= 16;
208 *val = data & 0xffff;
209 return ret;
210}
211
212static int read_config_dword(struct pci_bus *bus, unsigned int devfn,
213 int where, u32 *val)
214{
215 return config_access(PCI_ACCESS_READ, bus, devfn, where, val);
216}
217
218static int write_config_byte(struct pci_bus *bus, unsigned int devfn,
219 int where, u8 val)
220{
221 u32 data = 0;
222
223 if (config_access(PCI_ACCESS_READ, bus, devfn, where, &data))
224 return -1;
225
226 data = (data & ~(0xff << ((where & 3) << 3))) |
227 (val << ((where & 3) << 3));
228
229 if (config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data))
230 return -1;
231
232 return PCIBIOS_SUCCESSFUL;
233}
234
235static int write_config_word(struct pci_bus *bus, unsigned int devfn,
236 int where, u16 val)
237{
238 u32 data = 0;
239
240 if (config_access(PCI_ACCESS_READ, bus, devfn, where, &data))
241 return -1;
242
243 data = (data & ~(0xffff << ((where & 3) << 3))) |
244 (val << ((where & 3) << 3));
245
246 if (config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data))
247 return -1;
248
249 return PCIBIOS_SUCCESSFUL;
250}
251
252static int write_config_dword(struct pci_bus *bus, unsigned int devfn,
253 int where, u32 val)
254{
255 return config_access(PCI_ACCESS_WRITE, bus, devfn, where, &val);
256}
257
258static int alchemy_pci_read(struct pci_bus *bus, unsigned int devfn,
259 int where, int size, u32 *val)
260{
261 switch (size) {
262 case 1: {
263 u8 _val;
264 int rc = read_config_byte(bus, devfn, where, &_val);
265
266 *val = _val;
267 return rc;
268 }
269 case 2: {
270 u16 _val;
271 int rc = read_config_word(bus, devfn, where, &_val);
272
273 *val = _val;
274 return rc;
275 }
276 default:
277 return read_config_dword(bus, devfn, where, val);
278 }
279}
280
281static int alchemy_pci_write(struct pci_bus *bus, unsigned int devfn,
282 int where, int size, u32 val)
283{
284 switch (size) {
285 case 1:
286 return write_config_byte(bus, devfn, where, (u8) val);
287 case 2:
288 return write_config_word(bus, devfn, where, (u16) val);
289 default:
290 return write_config_dword(bus, devfn, where, val);
291 }
292}
293
294static struct pci_ops alchemy_pci_ops = {
295 .read = alchemy_pci_read,
296 .write = alchemy_pci_write,
297};
298
299static int alchemy_pci_def_idsel(unsigned int devsel, int assert)
300{
301 return 1; /* success */
302}
303
304/* save PCI controller register contents. */
305static int alchemy_pci_suspend(void)
306{
307 struct alchemy_pci_context *ctx = __alchemy_pci_ctx;
308 if (!ctx)
309 return 0;
310
311 ctx->pm[0] = __raw_readl(ctx->regs + PCI_REG_CMEM);
312 ctx->pm[1] = __raw_readl(ctx->regs + PCI_REG_CONFIG) & 0x0009ffff;
313 ctx->pm[2] = __raw_readl(ctx->regs + PCI_REG_B2BMASK_CCH);
314 ctx->pm[3] = __raw_readl(ctx->regs + PCI_REG_B2BBASE0_VID);
315 ctx->pm[4] = __raw_readl(ctx->regs + PCI_REG_B2BBASE1_SID);
316 ctx->pm[5] = __raw_readl(ctx->regs + PCI_REG_MWMASK_DEV);
317 ctx->pm[6] = __raw_readl(ctx->regs + PCI_REG_MWBASE_REV_CCL);
318 ctx->pm[7] = __raw_readl(ctx->regs + PCI_REG_ID);
319 ctx->pm[8] = __raw_readl(ctx->regs + PCI_REG_CLASSREV);
320 ctx->pm[9] = __raw_readl(ctx->regs + PCI_REG_PARAM);
321 ctx->pm[10] = __raw_readl(ctx->regs + PCI_REG_MBAR);
322 ctx->pm[11] = __raw_readl(ctx->regs + PCI_REG_TIMEOUT);
323
324 return 0;
325}
326
327static void alchemy_pci_resume(void)
328{
329 struct alchemy_pci_context *ctx = __alchemy_pci_ctx;
330 if (!ctx)
331 return;
332
333 __raw_writel(ctx->pm[0], ctx->regs + PCI_REG_CMEM);
334 __raw_writel(ctx->pm[2], ctx->regs + PCI_REG_B2BMASK_CCH);
335 __raw_writel(ctx->pm[3], ctx->regs + PCI_REG_B2BBASE0_VID);
336 __raw_writel(ctx->pm[4], ctx->regs + PCI_REG_B2BBASE1_SID);
337 __raw_writel(ctx->pm[5], ctx->regs + PCI_REG_MWMASK_DEV);
338 __raw_writel(ctx->pm[6], ctx->regs + PCI_REG_MWBASE_REV_CCL);
339 __raw_writel(ctx->pm[7], ctx->regs + PCI_REG_ID);
340 __raw_writel(ctx->pm[8], ctx->regs + PCI_REG_CLASSREV);
341 __raw_writel(ctx->pm[9], ctx->regs + PCI_REG_PARAM);
342 __raw_writel(ctx->pm[10], ctx->regs + PCI_REG_MBAR);
343 __raw_writel(ctx->pm[11], ctx->regs + PCI_REG_TIMEOUT);
344 wmb();
345 __raw_writel(ctx->pm[1], ctx->regs + PCI_REG_CONFIG);
346 wmb();
347
348 /* YAMON on all db1xxx boards wipes the TLB and writes zero to C0_wired
349 * on resume, making it necessary to recreate it as soon as possible.
350 */
351 ctx->wired_entry = 8191; /* impossibly high value */
352 alchemy_pci_wired_entry(ctx); /* install it */
353}
354
355static struct syscore_ops alchemy_pci_pmops = {
356 .suspend = alchemy_pci_suspend,
357 .resume = alchemy_pci_resume,
358};
359
360static int alchemy_pci_probe(struct platform_device *pdev)
361{
362 struct alchemy_pci_platdata *pd = pdev->dev.platform_data;
363 struct alchemy_pci_context *ctx;
364 void __iomem *virt_io;
365 unsigned long val;
366 struct resource *r;
367 int ret;
368
369 /* need at least PCI IRQ mapping table */
370 if (!pd) {
371 dev_err(&pdev->dev, "need platform data for PCI setup\n");
372 ret = -ENODEV;
373 goto out;
374 }
375
376 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
377 if (!ctx) {
378 dev_err(&pdev->dev, "no memory for pcictl context\n");
379 ret = -ENOMEM;
380 goto out;
381 }
382
383 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
384 if (!r) {
385 dev_err(&pdev->dev, "no pcictl ctrl regs resource\n");
386 ret = -ENODEV;
387 goto out1;
388 }
389
390 if (!request_mem_region(r->start, resource_size(r), pdev->name)) {
391 dev_err(&pdev->dev, "cannot claim pci regs\n");
392 ret = -ENODEV;
393 goto out1;
394 }
395
396 ctx->regs = ioremap_nocache(r->start, resource_size(r));
397 if (!ctx->regs) {
398 dev_err(&pdev->dev, "cannot map pci regs\n");
399 ret = -ENODEV;
400 goto out2;
401 }
402
403 /* map parts of the PCI IO area */
404 /* REVISIT: if this changes with a newer variant (doubt it) make this
405 * a platform resource.
406 */
407 virt_io = ioremap(AU1500_PCI_IO_PHYS_ADDR, 0x00100000);
408 if (!virt_io) {
409 dev_err(&pdev->dev, "cannot remap pci io space\n");
410 ret = -ENODEV;
411 goto out3;
412 }
413 ctx->alchemy_pci_ctrl.io_map_base = (unsigned long)virt_io;
414
415 /* Au1500 revisions older than AD have borked coherent PCI */
416 if ((alchemy_get_cputype() == ALCHEMY_CPU_AU1500) &&
417 (read_c0_prid() < 0x01030202) && !coherentio) {
418 val = __raw_readl(ctx->regs + PCI_REG_CONFIG);
419 val |= PCI_CONFIG_NC;
420 __raw_writel(val, ctx->regs + PCI_REG_CONFIG);
421 wmb();
422 dev_info(&pdev->dev, "non-coherent PCI on Au1500 AA/AB/AC\n");
423 }
424
425 if (pd->board_map_irq)
426 ctx->board_map_irq = pd->board_map_irq;
427
428 if (pd->board_pci_idsel)
429 ctx->board_pci_idsel = pd->board_pci_idsel;
430 else
431 ctx->board_pci_idsel = alchemy_pci_def_idsel;
432
433 /* fill in relevant pci_controller members */
434 ctx->alchemy_pci_ctrl.pci_ops = &alchemy_pci_ops;
435 ctx->alchemy_pci_ctrl.mem_resource = &alchemy_pci_def_memres;
436 ctx->alchemy_pci_ctrl.io_resource = &alchemy_pci_def_iores;
437
438 /* we can't ioremap the entire pci config space because it's too large,
439 * nor can we dynamically ioremap it because some drivers use the
440 * PCI config routines from within atomic contex and that becomes a
441 * problem in get_vm_area(). Instead we use one wired TLB entry to
442 * handle all config accesses for all busses.
443 */
444 ctx->pci_cfg_vm = get_vm_area(0x2000, VM_IOREMAP);
445 if (!ctx->pci_cfg_vm) {
446 dev_err(&pdev->dev, "unable to get vm area\n");
447 ret = -ENOMEM;
448 goto out4;
449 }
450 ctx->wired_entry = 8191; /* impossibly high value */
451 alchemy_pci_wired_entry(ctx); /* install it */
452
453 set_io_port_base((unsigned long)ctx->alchemy_pci_ctrl.io_map_base);
454
455 /* board may want to modify bits in the config register, do it now */
456 val = __raw_readl(ctx->regs + PCI_REG_CONFIG);
457 val &= ~pd->pci_cfg_clr;
458 val |= pd->pci_cfg_set;
459 val &= ~PCI_CONFIG_PD; /* clear disable bit */
460 __raw_writel(val, ctx->regs + PCI_REG_CONFIG);
461 wmb();
462
463 __alchemy_pci_ctx = ctx;
464 platform_set_drvdata(pdev, ctx);
465 register_syscore_ops(&alchemy_pci_pmops);
466 register_pci_controller(&ctx->alchemy_pci_ctrl);
467
468 return 0;
469
470out4:
471 iounmap(virt_io);
472out3:
473 iounmap(ctx->regs);
474out2:
475 release_mem_region(r->start, resource_size(r));
476out1:
477 kfree(ctx);
478out:
479 return ret;
480}
481
482static struct platform_driver alchemy_pcictl_driver = {
483 .probe = alchemy_pci_probe,
484 .driver = {
485 .name = "alchemy-pci",
486 .owner = THIS_MODULE,
487 },
488};
489
490static int __init alchemy_pci_init(void)
491{
492 /* Au1500/Au1550 have PCI */
493 switch (alchemy_get_cputype()) {
494 case ALCHEMY_CPU_AU1500:
495 case ALCHEMY_CPU_AU1550:
496 return platform_driver_register(&alchemy_pcictl_driver);
497 }
498 return 0;
499}
500arch_initcall(alchemy_pci_init);
501
502
503int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
504{
505 struct alchemy_pci_context *ctx = dev->sysdata;
506 if (ctx && ctx->board_map_irq)
507 return ctx->board_map_irq(dev, slot, pin);
508 return -1;
509}
510
511int pcibios_plat_dev_init(struct pci_dev *dev)
512{
513 return 0;
514}