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-rw-r--r--arch/mips/pci/ops-bcm63xx.c467
1 files changed, 467 insertions, 0 deletions
diff --git a/arch/mips/pci/ops-bcm63xx.c b/arch/mips/pci/ops-bcm63xx.c
new file mode 100644
index 000000000000..822ae179bc56
--- /dev/null
+++ b/arch/mips/pci/ops-bcm63xx.c
@@ -0,0 +1,467 @@
1/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
7 */
8
9#include <linux/types.h>
10#include <linux/pci.h>
11#include <linux/kernel.h>
12#include <linux/init.h>
13#include <linux/delay.h>
14#include <linux/io.h>
15
16#include "pci-bcm63xx.h"
17
18/*
19 * swizzle 32bits data to return only the needed part
20 */
21static int postprocess_read(u32 data, int where, unsigned int size)
22{
23 u32 ret;
24
25 ret = 0;
26 switch (size) {
27 case 1:
28 ret = (data >> ((where & 3) << 3)) & 0xff;
29 break;
30 case 2:
31 ret = (data >> ((where & 3) << 3)) & 0xffff;
32 break;
33 case 4:
34 ret = data;
35 break;
36 }
37 return ret;
38}
39
40static int preprocess_write(u32 orig_data, u32 val, int where,
41 unsigned int size)
42{
43 u32 ret;
44
45 ret = 0;
46 switch (size) {
47 case 1:
48 ret = (orig_data & ~(0xff << ((where & 3) << 3))) |
49 (val << ((where & 3) << 3));
50 break;
51 case 2:
52 ret = (orig_data & ~(0xffff << ((where & 3) << 3))) |
53 (val << ((where & 3) << 3));
54 break;
55 case 4:
56 ret = val;
57 break;
58 }
59 return ret;
60}
61
62/*
63 * setup hardware for a configuration cycle with given parameters
64 */
65static int bcm63xx_setup_cfg_access(int type, unsigned int busn,
66 unsigned int devfn, int where)
67{
68 unsigned int slot, func, reg;
69 u32 val;
70
71 slot = PCI_SLOT(devfn);
72 func = PCI_FUNC(devfn);
73 reg = where >> 2;
74
75 /* sanity check */
76 if (slot > (MPI_L2PCFG_DEVNUM_MASK >> MPI_L2PCFG_DEVNUM_SHIFT))
77 return 1;
78
79 if (func > (MPI_L2PCFG_FUNC_MASK >> MPI_L2PCFG_FUNC_SHIFT))
80 return 1;
81
82 if (reg > (MPI_L2PCFG_REG_MASK >> MPI_L2PCFG_REG_SHIFT))
83 return 1;
84
85 /* ok, setup config access */
86 val = (reg << MPI_L2PCFG_REG_SHIFT);
87 val |= (func << MPI_L2PCFG_FUNC_SHIFT);
88 val |= (slot << MPI_L2PCFG_DEVNUM_SHIFT);
89 val |= MPI_L2PCFG_CFG_USEREG_MASK;
90 val |= MPI_L2PCFG_CFG_SEL_MASK;
91 /* type 0 cycle for local bus, type 1 cycle for anything else */
92 if (type != 0) {
93 /* FIXME: how to specify bus ??? */
94 val |= (1 << MPI_L2PCFG_CFG_TYPE_SHIFT);
95 }
96 bcm_mpi_writel(val, MPI_L2PCFG_REG);
97
98 return 0;
99}
100
101static int bcm63xx_do_cfg_read(int type, unsigned int busn,
102 unsigned int devfn, int where, int size,
103 u32 *val)
104{
105 u32 data;
106
107 /* two phase cycle, first we write address, then read data at
108 * another location, caller already has a spinlock so no need
109 * to add one here */
110 if (bcm63xx_setup_cfg_access(type, busn, devfn, where))
111 return PCIBIOS_DEVICE_NOT_FOUND;
112 iob();
113 data = le32_to_cpu(__raw_readl(pci_iospace_start));
114 /* restore IO space normal behaviour */
115 bcm_mpi_writel(0, MPI_L2PCFG_REG);
116
117 *val = postprocess_read(data, where, size);
118
119 return PCIBIOS_SUCCESSFUL;
120}
121
122static int bcm63xx_do_cfg_write(int type, unsigned int busn,
123 unsigned int devfn, int where, int size,
124 u32 val)
125{
126 u32 data;
127
128 /* two phase cycle, first we write address, then write data to
129 * another location, caller already has a spinlock so no need
130 * to add one here */
131 if (bcm63xx_setup_cfg_access(type, busn, devfn, where))
132 return PCIBIOS_DEVICE_NOT_FOUND;
133 iob();
134
135 data = le32_to_cpu(__raw_readl(pci_iospace_start));
136 data = preprocess_write(data, val, where, size);
137
138 __raw_writel(cpu_to_le32(data), pci_iospace_start);
139 wmb();
140 /* no way to know the access is done, we have to wait */
141 udelay(500);
142 /* restore IO space normal behaviour */
143 bcm_mpi_writel(0, MPI_L2PCFG_REG);
144
145 return PCIBIOS_SUCCESSFUL;
146}
147
148static int bcm63xx_pci_read(struct pci_bus *bus, unsigned int devfn,
149 int where, int size, u32 *val)
150{
151 int type;
152
153 type = bus->parent ? 1 : 0;
154
155 if (type == 0 && PCI_SLOT(devfn) == CARDBUS_PCI_IDSEL)
156 return PCIBIOS_DEVICE_NOT_FOUND;
157
158 return bcm63xx_do_cfg_read(type, bus->number, devfn,
159 where, size, val);
160}
161
162static int bcm63xx_pci_write(struct pci_bus *bus, unsigned int devfn,
163 int where, int size, u32 val)
164{
165 int type;
166
167 type = bus->parent ? 1 : 0;
168
169 if (type == 0 && PCI_SLOT(devfn) == CARDBUS_PCI_IDSEL)
170 return PCIBIOS_DEVICE_NOT_FOUND;
171
172 return bcm63xx_do_cfg_write(type, bus->number, devfn,
173 where, size, val);
174}
175
176struct pci_ops bcm63xx_pci_ops = {
177 .read = bcm63xx_pci_read,
178 .write = bcm63xx_pci_write
179};
180
181#ifdef CONFIG_CARDBUS
182/*
183 * emulate configuration read access on a cardbus bridge
184 */
185#define FAKE_CB_BRIDGE_SLOT 0x1e
186
187static int fake_cb_bridge_bus_number = -1;
188
189static struct {
190 u16 pci_command;
191 u8 cb_latency;
192 u8 subordinate_busn;
193 u8 cardbus_busn;
194 u8 pci_busn;
195 int bus_assigned;
196 u16 bridge_control;
197
198 u32 mem_base0;
199 u32 mem_limit0;
200 u32 mem_base1;
201 u32 mem_limit1;
202
203 u32 io_base0;
204 u32 io_limit0;
205 u32 io_base1;
206 u32 io_limit1;
207} fake_cb_bridge_regs;
208
209static int fake_cb_bridge_read(int where, int size, u32 *val)
210{
211 unsigned int reg;
212 u32 data;
213
214 data = 0;
215 reg = where >> 2;
216 switch (reg) {
217 case (PCI_VENDOR_ID >> 2):
218 case (PCI_CB_SUBSYSTEM_VENDOR_ID >> 2):
219 /* create dummy vendor/device id from our cpu id */
220 data = (bcm63xx_get_cpu_id() << 16) | PCI_VENDOR_ID_BROADCOM;
221 break;
222
223 case (PCI_COMMAND >> 2):
224 data = (PCI_STATUS_DEVSEL_SLOW << 16);
225 data |= fake_cb_bridge_regs.pci_command;
226 break;
227
228 case (PCI_CLASS_REVISION >> 2):
229 data = (PCI_CLASS_BRIDGE_CARDBUS << 16);
230 break;
231
232 case (PCI_CACHE_LINE_SIZE >> 2):
233 data = (PCI_HEADER_TYPE_CARDBUS << 16);
234 break;
235
236 case (PCI_INTERRUPT_LINE >> 2):
237 /* bridge control */
238 data = (fake_cb_bridge_regs.bridge_control << 16);
239 /* pin:intA line:0xff */
240 data |= (0x1 << 8) | 0xff;
241 break;
242
243 case (PCI_CB_PRIMARY_BUS >> 2):
244 data = (fake_cb_bridge_regs.cb_latency << 24);
245 data |= (fake_cb_bridge_regs.subordinate_busn << 16);
246 data |= (fake_cb_bridge_regs.cardbus_busn << 8);
247 data |= fake_cb_bridge_regs.pci_busn;
248 break;
249
250 case (PCI_CB_MEMORY_BASE_0 >> 2):
251 data = fake_cb_bridge_regs.mem_base0;
252 break;
253
254 case (PCI_CB_MEMORY_LIMIT_0 >> 2):
255 data = fake_cb_bridge_regs.mem_limit0;
256 break;
257
258 case (PCI_CB_MEMORY_BASE_1 >> 2):
259 data = fake_cb_bridge_regs.mem_base1;
260 break;
261
262 case (PCI_CB_MEMORY_LIMIT_1 >> 2):
263 data = fake_cb_bridge_regs.mem_limit1;
264 break;
265
266 case (PCI_CB_IO_BASE_0 >> 2):
267 /* | 1 for 32bits io support */
268 data = fake_cb_bridge_regs.io_base0 | 0x1;
269 break;
270
271 case (PCI_CB_IO_LIMIT_0 >> 2):
272 data = fake_cb_bridge_regs.io_limit0;
273 break;
274
275 case (PCI_CB_IO_BASE_1 >> 2):
276 /* | 1 for 32bits io support */
277 data = fake_cb_bridge_regs.io_base1 | 0x1;
278 break;
279
280 case (PCI_CB_IO_LIMIT_1 >> 2):
281 data = fake_cb_bridge_regs.io_limit1;
282 break;
283 }
284
285 *val = postprocess_read(data, where, size);
286 return PCIBIOS_SUCCESSFUL;
287}
288
289/*
290 * emulate configuration write access on a cardbus bridge
291 */
292static int fake_cb_bridge_write(int where, int size, u32 val)
293{
294 unsigned int reg;
295 u32 data, tmp;
296 int ret;
297
298 ret = fake_cb_bridge_read((where & ~0x3), 4, &data);
299 if (ret != PCIBIOS_SUCCESSFUL)
300 return ret;
301
302 data = preprocess_write(data, val, where, size);
303
304 reg = where >> 2;
305 switch (reg) {
306 case (PCI_COMMAND >> 2):
307 fake_cb_bridge_regs.pci_command = (data & 0xffff);
308 break;
309
310 case (PCI_CB_PRIMARY_BUS >> 2):
311 fake_cb_bridge_regs.cb_latency = (data >> 24) & 0xff;
312 fake_cb_bridge_regs.subordinate_busn = (data >> 16) & 0xff;
313 fake_cb_bridge_regs.cardbus_busn = (data >> 8) & 0xff;
314 fake_cb_bridge_regs.pci_busn = data & 0xff;
315 if (fake_cb_bridge_regs.cardbus_busn)
316 fake_cb_bridge_regs.bus_assigned = 1;
317 break;
318
319 case (PCI_INTERRUPT_LINE >> 2):
320 tmp = (data >> 16) & 0xffff;
321 /* disable memory prefetch support */
322 tmp &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM0;
323 tmp &= ~PCI_CB_BRIDGE_CTL_PREFETCH_MEM1;
324 fake_cb_bridge_regs.bridge_control = tmp;
325 break;
326
327 case (PCI_CB_MEMORY_BASE_0 >> 2):
328 fake_cb_bridge_regs.mem_base0 = data;
329 break;
330
331 case (PCI_CB_MEMORY_LIMIT_0 >> 2):
332 fake_cb_bridge_regs.mem_limit0 = data;
333 break;
334
335 case (PCI_CB_MEMORY_BASE_1 >> 2):
336 fake_cb_bridge_regs.mem_base1 = data;
337 break;
338
339 case (PCI_CB_MEMORY_LIMIT_1 >> 2):
340 fake_cb_bridge_regs.mem_limit1 = data;
341 break;
342
343 case (PCI_CB_IO_BASE_0 >> 2):
344 fake_cb_bridge_regs.io_base0 = data;
345 break;
346
347 case (PCI_CB_IO_LIMIT_0 >> 2):
348 fake_cb_bridge_regs.io_limit0 = data;
349 break;
350
351 case (PCI_CB_IO_BASE_1 >> 2):
352 fake_cb_bridge_regs.io_base1 = data;
353 break;
354
355 case (PCI_CB_IO_LIMIT_1 >> 2):
356 fake_cb_bridge_regs.io_limit1 = data;
357 break;
358 }
359
360 return PCIBIOS_SUCCESSFUL;
361}
362
363static int bcm63xx_cb_read(struct pci_bus *bus, unsigned int devfn,
364 int where, int size, u32 *val)
365{
366 /* snoop access to slot 0x1e on root bus, we fake a cardbus
367 * bridge at this location */
368 if (!bus->parent && PCI_SLOT(devfn) == FAKE_CB_BRIDGE_SLOT) {
369 fake_cb_bridge_bus_number = bus->number;
370 return fake_cb_bridge_read(where, size, val);
371 }
372
373 /* a configuration cycle for the device behind the cardbus
374 * bridge is actually done as a type 0 cycle on the primary
375 * bus. This means that only one device can be on the cardbus
376 * bus */
377 if (fake_cb_bridge_regs.bus_assigned &&
378 bus->number == fake_cb_bridge_regs.cardbus_busn &&
379 PCI_SLOT(devfn) == 0)
380 return bcm63xx_do_cfg_read(0, 0,
381 PCI_DEVFN(CARDBUS_PCI_IDSEL, 0),
382 where, size, val);
383
384 return PCIBIOS_DEVICE_NOT_FOUND;
385}
386
387static int bcm63xx_cb_write(struct pci_bus *bus, unsigned int devfn,
388 int where, int size, u32 val)
389{
390 if (!bus->parent && PCI_SLOT(devfn) == FAKE_CB_BRIDGE_SLOT) {
391 fake_cb_bridge_bus_number = bus->number;
392 return fake_cb_bridge_write(where, size, val);
393 }
394
395 if (fake_cb_bridge_regs.bus_assigned &&
396 bus->number == fake_cb_bridge_regs.cardbus_busn &&
397 PCI_SLOT(devfn) == 0)
398 return bcm63xx_do_cfg_write(0, 0,
399 PCI_DEVFN(CARDBUS_PCI_IDSEL, 0),
400 where, size, val);
401
402 return PCIBIOS_DEVICE_NOT_FOUND;
403}
404
405struct pci_ops bcm63xx_cb_ops = {
406 .read = bcm63xx_cb_read,
407 .write = bcm63xx_cb_write,
408};
409
410/*
411 * only one IO window, so it cannot be shared by PCI and cardbus, use
412 * fixup to choose and detect unhandled configuration
413 */
414static void bcm63xx_fixup(struct pci_dev *dev)
415{
416 static int io_window = -1;
417 int i, found, new_io_window;
418 u32 val;
419
420 /* look for any io resource */
421 found = 0;
422 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
423 if (pci_resource_flags(dev, i) & IORESOURCE_IO) {
424 found = 1;
425 break;
426 }
427 }
428
429 if (!found)
430 return;
431
432 /* skip our fake bus with only cardbus bridge on it */
433 if (dev->bus->number == fake_cb_bridge_bus_number)
434 return;
435
436 /* find on which bus the device is */
437 if (fake_cb_bridge_regs.bus_assigned &&
438 dev->bus->number == fake_cb_bridge_regs.cardbus_busn &&
439 PCI_SLOT(dev->devfn) == 0)
440 new_io_window = 1;
441 else
442 new_io_window = 0;
443
444 if (new_io_window == io_window)
445 return;
446
447 if (io_window != -1) {
448 printk(KERN_ERR "bcm63xx: both PCI and cardbus devices "
449 "need IO, which hardware cannot do\n");
450 return;
451 }
452
453 printk(KERN_INFO "bcm63xx: PCI IO window assigned to %s\n",
454 (new_io_window == 0) ? "PCI" : "cardbus");
455
456 val = bcm_mpi_readl(MPI_L2PIOREMAP_REG);
457 if (io_window)
458 val |= MPI_L2PREMAP_IS_CARDBUS_MASK;
459 else
460 val &= ~MPI_L2PREMAP_IS_CARDBUS_MASK;
461 bcm_mpi_writel(val, MPI_L2PIOREMAP_REG);
462
463 io_window = new_io_window;
464}
465
466DECLARE_PCI_FIXUP_ENABLE(PCI_ANY_ID, PCI_ANY_ID, bcm63xx_fixup);
467#endif
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