Root/drivers/bcma/host_pci.c

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    pci_write_config_dword(core->bus->host_pci, BCMA_PCI_BAR0_WIN,
17                   core->addr);
18    pci_write_config_dword(core->bus->host_pci, BCMA_PCI_BAR0_WIN2,
19                   core->wrap);
20    core->bus->mapped_core = core;
21    bcma_debug(core->bus, "Switched to core: 0x%X\n", core->id.id);
22}
23
24/* Provides access to the requested core. Returns base offset that has to be
25 * used. It makes use of fixed windows when possible. */
26static u16 bcma_host_pci_provide_access_to_core(struct bcma_device *core)
27{
28    switch (core->id.id) {
29    case BCMA_CORE_CHIPCOMMON:
30        return 3 * BCMA_CORE_SIZE;
31    case BCMA_CORE_PCIE:
32        return 2 * BCMA_CORE_SIZE;
33    }
34
35    if (core->bus->mapped_core != core)
36        bcma_host_pci_switch_core(core);
37    return 0;
38}
39
40static u8 bcma_host_pci_read8(struct bcma_device *core, u16 offset)
41{
42    offset += bcma_host_pci_provide_access_to_core(core);
43    return ioread8(core->bus->mmio + offset);
44}
45
46static u16 bcma_host_pci_read16(struct bcma_device *core, u16 offset)
47{
48    offset += bcma_host_pci_provide_access_to_core(core);
49    return ioread16(core->bus->mmio + offset);
50}
51
52static u32 bcma_host_pci_read32(struct bcma_device *core, u16 offset)
53{
54    offset += bcma_host_pci_provide_access_to_core(core);
55    return ioread32(core->bus->mmio + offset);
56}
57
58static void bcma_host_pci_write8(struct bcma_device *core, u16 offset,
59                 u8 value)
60{
61    offset += bcma_host_pci_provide_access_to_core(core);
62    iowrite8(value, core->bus->mmio + offset);
63}
64
65static void bcma_host_pci_write16(struct bcma_device *core, u16 offset,
66                 u16 value)
67{
68    offset += bcma_host_pci_provide_access_to_core(core);
69    iowrite16(value, core->bus->mmio + offset);
70}
71
72static void bcma_host_pci_write32(struct bcma_device *core, u16 offset,
73                 u32 value)
74{
75    offset += bcma_host_pci_provide_access_to_core(core);
76    iowrite32(value, core->bus->mmio + offset);
77}
78
79#ifdef CONFIG_BCMA_BLOCKIO
80static void bcma_host_pci_block_read(struct bcma_device *core, void *buffer,
81                     size_t count, u16 offset, u8 reg_width)
82{
83    void __iomem *addr = core->bus->mmio + offset;
84    if (core->bus->mapped_core != core)
85        bcma_host_pci_switch_core(core);
86    switch (reg_width) {
87    case sizeof(u8):
88        ioread8_rep(addr, buffer, count);
89        break;
90    case sizeof(u16):
91        WARN_ON(count & 1);
92        ioread16_rep(addr, buffer, count >> 1);
93        break;
94    case sizeof(u32):
95        WARN_ON(count & 3);
96        ioread32_rep(addr, buffer, count >> 2);
97        break;
98    default:
99        WARN_ON(1);
100    }
101}
102
103static void bcma_host_pci_block_write(struct bcma_device *core,
104                      const void *buffer, size_t count,
105                      u16 offset, u8 reg_width)
106{
107    void __iomem *addr = core->bus->mmio + offset;
108    if (core->bus->mapped_core != core)
109        bcma_host_pci_switch_core(core);
110    switch (reg_width) {
111    case sizeof(u8):
112        iowrite8_rep(addr, buffer, count);
113        break;
114    case sizeof(u16):
115        WARN_ON(count & 1);
116        iowrite16_rep(addr, buffer, count >> 1);
117        break;
118    case sizeof(u32):
119        WARN_ON(count & 3);
120        iowrite32_rep(addr, buffer, count >> 2);
121        break;
122    default:
123        WARN_ON(1);
124    }
125}
126#endif
127
128static u32 bcma_host_pci_aread32(struct bcma_device *core, u16 offset)
129{
130    if (core->bus->mapped_core != core)
131        bcma_host_pci_switch_core(core);
132    return ioread32(core->bus->mmio + (1 * BCMA_CORE_SIZE) + offset);
133}
134
135static void bcma_host_pci_awrite32(struct bcma_device *core, u16 offset,
136                  u32 value)
137{
138    if (core->bus->mapped_core != core)
139        bcma_host_pci_switch_core(core);
140    iowrite32(value, core->bus->mmio + (1 * BCMA_CORE_SIZE) + offset);
141}
142
143static const struct bcma_host_ops bcma_host_pci_ops = {
144    .read8 = bcma_host_pci_read8,
145    .read16 = bcma_host_pci_read16,
146    .read32 = bcma_host_pci_read32,
147    .write8 = bcma_host_pci_write8,
148    .write16 = bcma_host_pci_write16,
149    .write32 = bcma_host_pci_write32,
150#ifdef CONFIG_BCMA_BLOCKIO
151    .block_read = bcma_host_pci_block_read,
152    .block_write = bcma_host_pci_block_write,
153#endif
154    .aread32 = bcma_host_pci_aread32,
155    .awrite32 = bcma_host_pci_awrite32,
156};
157
158static int bcma_host_pci_probe(struct pci_dev *dev,
159                   const struct pci_device_id *id)
160{
161    struct bcma_bus *bus;
162    int err = -ENOMEM;
163    const char *name;
164    u32 val;
165
166    /* Alloc */
167    bus = kzalloc(sizeof(*bus), GFP_KERNEL);
168    if (!bus)
169        goto out;
170
171    /* Basic PCI configuration */
172    err = pci_enable_device(dev);
173    if (err)
174        goto err_kfree_bus;
175
176    name = dev_name(&dev->dev);
177    if (dev->driver && dev->driver->name)
178        name = dev->driver->name;
179    err = pci_request_regions(dev, name);
180    if (err)
181        goto err_pci_disable;
182    pci_set_master(dev);
183
184    /* Disable the RETRY_TIMEOUT register (0x41) to keep
185     * PCI Tx retries from interfering with C3 CPU state */
186    pci_read_config_dword(dev, 0x40, &val);
187    if ((val & 0x0000ff00) != 0)
188        pci_write_config_dword(dev, 0x40, val & 0xffff00ff);
189
190    /* SSB needed additional powering up, do we have any AMBA PCI cards? */
191    if (!pci_is_pcie(dev))
192        bcma_err(bus, "PCI card detected, report problems.\n");
193
194    /* Map MMIO */
195    err = -ENOMEM;
196    bus->mmio = pci_iomap(dev, 0, ~0UL);
197    if (!bus->mmio)
198        goto err_pci_release_regions;
199
200    /* Host specific */
201    bus->host_pci = dev;
202    bus->hosttype = BCMA_HOSTTYPE_PCI;
203    bus->ops = &bcma_host_pci_ops;
204
205    bus->boardinfo.vendor = bus->host_pci->subsystem_vendor;
206    bus->boardinfo.type = bus->host_pci->subsystem_device;
207
208    /* Register */
209    err = bcma_bus_register(bus);
210    if (err)
211        goto err_pci_unmap_mmio;
212
213    pci_set_drvdata(dev, bus);
214
215out:
216    return err;
217
218err_pci_unmap_mmio:
219    pci_iounmap(dev, bus->mmio);
220err_pci_release_regions:
221    pci_release_regions(dev);
222err_pci_disable:
223    pci_disable_device(dev);
224err_kfree_bus:
225    kfree(bus);
226    return err;
227}
228
229static void bcma_host_pci_remove(struct pci_dev *dev)
230{
231    struct bcma_bus *bus = pci_get_drvdata(dev);
232
233    bcma_bus_unregister(bus);
234    pci_iounmap(dev, bus->mmio);
235    pci_release_regions(dev);
236    pci_disable_device(dev);
237    kfree(bus);
238    pci_set_drvdata(dev, NULL);
239}
240
241#ifdef CONFIG_PM_SLEEP
242static int bcma_host_pci_suspend(struct device *dev)
243{
244    struct pci_dev *pdev = to_pci_dev(dev);
245    struct bcma_bus *bus = pci_get_drvdata(pdev);
246
247    bus->mapped_core = NULL;
248
249    return bcma_bus_suspend(bus);
250}
251
252static int bcma_host_pci_resume(struct device *dev)
253{
254    struct pci_dev *pdev = to_pci_dev(dev);
255    struct bcma_bus *bus = pci_get_drvdata(pdev);
256
257    return bcma_bus_resume(bus);
258}
259
260static SIMPLE_DEV_PM_OPS(bcma_pm_ops, bcma_host_pci_suspend,
261             bcma_host_pci_resume);
262#define BCMA_PM_OPS (&bcma_pm_ops)
263
264#else /* CONFIG_PM_SLEEP */
265
266#define BCMA_PM_OPS NULL
267
268#endif /* CONFIG_PM_SLEEP */
269
270static DEFINE_PCI_DEVICE_TABLE(bcma_pci_bridge_tbl) = {
271    { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x0576) },
272    { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 43224) },
273    { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4331) },
274    { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4353) },
275    { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4357) },
276    { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4358) },
277    { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4359) },
278    { PCI_DEVICE(PCI_VENDOR_ID_BROADCOM, 0x4727) },
279    { 0, },
280};
281MODULE_DEVICE_TABLE(pci, bcma_pci_bridge_tbl);
282
283static struct pci_driver bcma_pci_bridge_driver = {
284    .name = "bcma-pci-bridge",
285    .id_table = bcma_pci_bridge_tbl,
286    .probe = bcma_host_pci_probe,
287    .remove = bcma_host_pci_remove,
288    .driver.pm = BCMA_PM_OPS,
289};
290
291int __init bcma_host_pci_init(void)
292{
293    return pci_register_driver(&bcma_pci_bridge_driver);
294}
295
296void __exit bcma_host_pci_exit(void)
297{
298    pci_unregister_driver(&bcma_pci_bridge_driver);
299}
300

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