1/*
2 * Broadcom specific AMBA
3 * PCI Host
4 *
5 * Licensed under the GNU/GPL. See COPYING for details.
6 */
7
8#include "bcma_private.h"
9#include <linux/slab.h>
10#include <linux/bcma/bcma.h>
11#include <linux/pci.h>
12#include <linux/module.h>
13
14static void bcma_host_pci_switch_core(struct bcma_device *core)
15{
16 int win2 = core->bus->host_is_pcie2 ?
17 BCMA_PCIE2_BAR0_WIN2 : BCMA_PCI_BAR0_WIN2;
18
19 pci_write_config_dword(dev: core->bus->host_pci, BCMA_PCI_BAR0_WIN,
20 val: core->addr);
21 pci_write_config_dword(dev: core->bus->host_pci, where: win2, val: core->wrap);
22 core->bus->mapped_core = core;
23 bcma_debug(core->bus, "Switched to core: 0x%X\n", core->id.id);
24}
25
26/* Provides access to the requested core. Returns base offset that has to be
27 * used. It makes use of fixed windows when possible. */
28static u16 bcma_host_pci_provide_access_to_core(struct bcma_device *core)
29{
30 switch (core->id.id) {
31 case BCMA_CORE_CHIPCOMMON:
32 return 3 * BCMA_CORE_SIZE;
33 case BCMA_CORE_PCIE:
34 return 2 * BCMA_CORE_SIZE;
35 }
36
37 if (core->bus->mapped_core != core)
38 bcma_host_pci_switch_core(core);
39 return 0;
40}
41
42static u8 bcma_host_pci_read8(struct bcma_device *core, u16 offset)
43{
44 offset += bcma_host_pci_provide_access_to_core(core);
45 return ioread8(core->bus->mmio + offset);
46}
47
48static u16 bcma_host_pci_read16(struct bcma_device *core, u16 offset)
49{
50 offset += bcma_host_pci_provide_access_to_core(core);
51 return ioread16(core->bus->mmio + offset);
52}
53
54static u32 bcma_host_pci_read32(struct bcma_device *core, u16 offset)
55{
56 offset += bcma_host_pci_provide_access_to_core(core);
57 return ioread32(core->bus->mmio + offset);
58}
59
60static void bcma_host_pci_write8(struct bcma_device *core, u16 offset,
61 u8 value)
62{
63 offset += bcma_host_pci_provide_access_to_core(core);
64 iowrite8(value, core->bus->mmio + offset);
65}
66
67static void bcma_host_pci_write16(struct bcma_device *core, u16 offset,
68 u16 value)
69{
70 offset += bcma_host_pci_provide_access_to_core(core);
71 iowrite16(value, core->bus->mmio + offset);
72}
73
74static void bcma_host_pci_write32(struct bcma_device *core, u16 offset,
75 u32 value)
76{
77 offset += bcma_host_pci_provide_access_to_core(core);
78 iowrite32(value, core->bus->mmio + offset);
79}
80
81#ifdef CONFIG_BCMA_BLOCKIO
82static void bcma_host_pci_block_read(struct bcma_device *core, void *buffer,
83 size_t count, u16 offset, u8 reg_width)
84{
85 void __iomem *addr = core->bus->mmio + offset;
86 if (core->bus->mapped_core != core)
87 bcma_host_pci_switch_core(core);
88 switch (reg_width) {
89 case sizeof(u8):
90 ioread8_rep(port: addr, buf: buffer, count);
91 break;
92 case sizeof(u16):
93 WARN_ON(count & 1);
94 ioread16_rep(port: addr, buf: buffer, count: count >> 1);
95 break;
96 case sizeof(u32):
97 WARN_ON(count & 3);
98 ioread32_rep(port: addr, buf: buffer, count: count >> 2);
99 break;
100 default:
101 WARN_ON(1);
102 }
103}
104
105static void bcma_host_pci_block_write(struct bcma_device *core,
106 const void *buffer, size_t count,
107 u16 offset, u8 reg_width)
108{
109 void __iomem *addr = core->bus->mmio + offset;
110 if (core->bus->mapped_core != core)
111 bcma_host_pci_switch_core(core);
112 switch (reg_width) {
113 case sizeof(u8):
114 iowrite8_rep(port: addr, buf: buffer, count);
115 break;
116 case sizeof(u16):
117 WARN_ON(count & 1);
118 iowrite16_rep(port: addr, buf: buffer, count: count >> 1);
119 break;
120 case sizeof(u32):
121 WARN_ON(count & 3);
122 iowrite32_rep(port: addr, buf: buffer, count: count >> 2);
123 break;
124 default:
125 WARN_ON(1);
126 }
127}
128#endif
129
130static u32 bcma_host_pci_aread32(struct bcma_device *core, u16 offset)
131{
132 if (core->bus->mapped_core != core)
133 bcma_host_pci_switch_core(core);
134 return ioread32(core->bus->mmio + (1 * BCMA_CORE_SIZE) + offset);
135}
136
137static void bcma_host_pci_awrite32(struct bcma_device *core, u16 offset,
138 u32 value)
139{
140 if (core->bus->mapped_core != core)
141 bcma_host_pci_switch_core(core);
142 iowrite32(value, core->bus->mmio + (1 * BCMA_CORE_SIZE) + offset);
143}
144
145static const struct bcma_host_ops bcma_host_pci_ops = {
146 .read8 = bcma_host_pci_read8,
147 .read16 = bcma_host_pci_read16,
148 .read32 = bcma_host_pci_read32,
149 .write8 = bcma_host_pci_write8,
150 .write16 = bcma_host_pci_write16,
151 .write32 = bcma_host_pci_write32,
152#ifdef CONFIG_BCMA_BLOCKIO
153 .block_read = bcma_host_pci_block_read,
154 .block_write = bcma_host_pci_block_write,
155#endif
156 .aread32 = bcma_host_pci_aread32,
157 .awrite32 = bcma_host_pci_awrite32,
158};
159
160static int bcma_host_pci_probe(struct pci_dev *dev,
161 const struct pci_device_id *id)
162{
163 struct bcma_bus *bus;
164 int err = -ENOMEM;
165 u32 val;
166
167 /* Alloc */
168 bus = kzalloc(size: sizeof(*bus), GFP_KERNEL);
169 if (!bus)
170 goto out;
171
172 /* Basic PCI configuration */
173 err = pci_enable_device(dev);
174 if (err)
175 goto err_kfree_bus;
176
177 err = pci_request_regions(dev, "bcma-pci-bridge");
178 if (err)
179 goto err_pci_disable;
180 pci_set_master(dev);
181
182 /* Disable the RETRY_TIMEOUT register (0x41) to keep
183 * PCI Tx retries from interfering with C3 CPU state */
184 pci_read_config_dword(dev, where: 0x40, val: &val);
185 if ((val & 0x0000ff00) != 0)
186 pci_write_config_dword(dev, where: 0x40, val: val & 0xffff00ff);
187
188 /* SSB needed additional powering up, do we have any AMBA PCI cards? */
189 if (!pci_is_pcie(dev)) {
190 bcma_err(bus, "PCI card detected, they are not supported.\n");
191 err = -ENXIO;
192 goto err_pci_release_regions;
193 }
194
195 bus->dev = &dev->dev;
196
197 /* Map MMIO */
198 err = -ENOMEM;
199 bus->mmio = pci_iomap(dev, bar: 0, max: ~0UL);
200 if (!bus->mmio)
201 goto err_pci_release_regions;
202
203 /* Host specific */
204 bus->host_pci = dev;
205 bus->hosttype = BCMA_HOSTTYPE_PCI;
206 bus->ops = &bcma_host_pci_ops;
207
208 bus->boardinfo.vendor = bus->host_pci->subsystem_vendor;
209 bus->boardinfo.type = bus->host_pci->subsystem_device;
210
211 /* Initialize struct, detect chip */
212 bcma_init_bus(bus);
213
214 /* Scan bus to find out generation of PCIe core */
215 err = bcma_bus_scan(bus);
216 if (err)
217 goto err_pci_unmap_mmio;
218
219 if (bcma_find_core(bus, BCMA_CORE_PCIE2))
220 bus->host_is_pcie2 = true;
221
222 /* Register */
223 err = bcma_bus_register(bus);
224 if (err)
225 goto err_unregister_cores;
226
227 pci_set_drvdata(pdev: dev, data: bus);
228
229out:
230 return err;
231
232err_unregister_cores:
233 bcma_unregister_cores(bus);
234err_pci_unmap_mmio:
235 pci_iounmap(dev, bus->mmio);
236err_pci_release_regions:
237 pci_release_regions(dev);
238err_pci_disable:
239 pci_disable_device(dev);
240err_kfree_bus:
241 kfree(objp: bus);
242 return err;
243}
244
245static void bcma_host_pci_remove(struct pci_dev *dev)
246{
247 struct bcma_bus *bus = pci_get_drvdata(pdev: dev);
248
249 bcma_bus_unregister(bus);
250 pci_iounmap(dev, bus->mmio);
251 pci_release_regions(dev);
252 pci_disable_device(dev);
253 kfree(objp: bus);
254}
255
256#ifdef CONFIG_PM_SLEEP
257static int bcma_host_pci_suspend(struct device *dev)
258{
259 struct bcma_bus *bus = dev_get_drvdata(dev);
260
261 bus->mapped_core = NULL;
262
263 return bcma_bus_suspend(bus);
264}
265
266static int bcma_host_pci_resume(struct device *dev)
267{
268 struct bcma_bus *bus = dev_get_drvdata(dev);
269
270 return bcma_bus_resume(bus);
271}
272
273static SIMPLE_DEV_PM_OPS(bcma_pm_ops, bcma_host_pci_suspend,
274 bcma_host_pci_resume);
275#define BCMA_PM_OPS (&bcma_pm_ops)
276
277#else /* CONFIG_PM_SLEEP */
278
279#define BCMA_PM_OPS NULL
280
281#endif /* CONFIG_PM_SLEEP */
282
283static const struct pci_device_id bcma_pci_bridge_tbl[] = {
284 { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x0576) },
285 { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4313) },
286 { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 43224) }, /* 0xa8d8 */
287 { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4331) },
288 { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4353) },
289 { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4357) },
290 { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4358) },
291 { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4359) },
292 { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4360) },
293 { PCI_DEVICE_SUB(PCI_VENDOR_ID_BROADCOM, 0x4365, PCI_VENDOR_ID_DELL, 0x0016) },
294 { PCI_DEVICE_SUB(PCI_VENDOR_ID_BROADCOM, 0x4365, PCI_VENDOR_ID_DELL, 0x0018) },
295 { PCI_DEVICE_SUB(PCI_VENDOR_ID_BROADCOM, 0x4365, PCI_VENDOR_ID_FOXCONN, 0xe092) },
296 { PCI_DEVICE_SUB(PCI_VENDOR_ID_BROADCOM, 0x4365, PCI_VENDOR_ID_HP, 0x804a) },
297 { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x43a0) },
298 { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x43a9) },
299 { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x43aa) },
300 { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x43b1) },
301 { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4727) },
302 { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 43227) }, /* 0xa8db, BCM43217 (sic!) */
303 { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 43228) }, /* 0xa8dc */
304 { 0, },
305};
306MODULE_DEVICE_TABLE(pci, bcma_pci_bridge_tbl);
307
308static struct pci_driver bcma_pci_bridge_driver = {
309 .name = "bcma-pci-bridge",
310 .id_table = bcma_pci_bridge_tbl,
311 .probe = bcma_host_pci_probe,
312 .remove = bcma_host_pci_remove,
313 .driver.pm = BCMA_PM_OPS,
314};
315
316int __init bcma_host_pci_init(void)
317{
318 return pci_register_driver(&bcma_pci_bridge_driver);
319}
320
321void __exit bcma_host_pci_exit(void)
322{
323 pci_unregister_driver(dev: &bcma_pci_bridge_driver);
324}
325
326/**************************************************
327 * Runtime ops for drivers.
328 **************************************************/
329
330/* See also pcicore_up */
331void bcma_host_pci_up(struct bcma_bus *bus)
332{
333 if (bus->hosttype != BCMA_HOSTTYPE_PCI)
334 return;
335
336 if (bus->host_is_pcie2)
337 bcma_core_pcie2_up(pcie2: &bus->drv_pcie2);
338 else
339 bcma_core_pci_up(pc: &bus->drv_pci[0]);
340}
341EXPORT_SYMBOL_GPL(bcma_host_pci_up);
342
343/* See also pcicore_down */
344void bcma_host_pci_down(struct bcma_bus *bus)
345{
346 if (bus->hosttype != BCMA_HOSTTYPE_PCI)
347 return;
348
349 if (!bus->host_is_pcie2)
350 bcma_core_pci_down(pc: &bus->drv_pci[0]);
351}
352EXPORT_SYMBOL_GPL(bcma_host_pci_down);
353
354/* See also si_pci_setup */
355int bcma_host_pci_irq_ctl(struct bcma_bus *bus, struct bcma_device *core,
356 bool enable)
357{
358 struct pci_dev *pdev;
359 u32 coremask, tmp;
360 int err = 0;
361
362 if (bus->hosttype != BCMA_HOSTTYPE_PCI) {
363 /* This bcma device is not on a PCI host-bus. So the IRQs are
364 * not routed through the PCI core.
365 * So we must not enable routing through the PCI core. */
366 goto out;
367 }
368
369 pdev = bus->host_pci;
370
371 err = pci_read_config_dword(dev: pdev, BCMA_PCI_IRQMASK, val: &tmp);
372 if (err)
373 goto out;
374
375 coremask = BIT(core->core_index) << 8;
376 if (enable)
377 tmp |= coremask;
378 else
379 tmp &= ~coremask;
380
381 err = pci_write_config_dword(dev: pdev, BCMA_PCI_IRQMASK, val: tmp);
382
383out:
384 return err;
385}
386EXPORT_SYMBOL_GPL(bcma_host_pci_irq_ctl);
387

source code of linux/drivers/bcma/host_pci.c