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276 lines · 5.5 KiB

1/*
2 * Broadcom specific AMBA
3 * System on Chip (SoC) Host
4 *
5 * Licensed under the GNU/GPL. See COPYING for details.
6 */
7
8#include "bcma_private.h"
9#include "scan.h"
10#include <linux/slab.h>
11#include <linux/module.h>
12#include <linux/of_address.h>
13#include <linux/bcma/bcma.h>
14#include <linux/bcma/bcma_soc.h>
15
16static u8 bcma_host_soc_read8(struct bcma_device *core, u16 offset)
17{
18 return readb(core->io_addr + offset);
19}
20
21static u16 bcma_host_soc_read16(struct bcma_device *core, u16 offset)
22{
23 return readw(core->io_addr + offset);
24}
25
26static u32 bcma_host_soc_read32(struct bcma_device *core, u16 offset)
27{
28 return readl(core->io_addr + offset);
29}
30
31static void bcma_host_soc_write8(struct bcma_device *core, u16 offset,
32 u8 value)
33{
34 writeb(value, core->io_addr + offset);
35}
36
37static void bcma_host_soc_write16(struct bcma_device *core, u16 offset,
38 u16 value)
39{
40 writew(value, core->io_addr + offset);
41}
42
43static void bcma_host_soc_write32(struct bcma_device *core, u16 offset,
44 u32 value)
45{
46 writel(value, core->io_addr + offset);
47}
48
49#ifdef CONFIG_BCMA_BLOCKIO
50static void bcma_host_soc_block_read(struct bcma_device *core, void *buffer,
51 size_t count, u16 offset, u8 reg_width)
52{
53 void __iomem *addr = core->io_addr + offset;
54
55 switch (reg_width) {
56 case sizeof(u8): {
57 u8 *buf = buffer;
58
59 while (count) {
60 *buf = __raw_readb(addr);
61 buf++;
62 count--;
63 }
64 break;
65 }
66 case sizeof(u16): {
67 __le16 *buf = buffer;
68
69 WARN_ON(count & 1);
70 while (count) {
71 *buf = (__force __le16)__raw_readw(addr);
72 buf++;
73 count -= 2;
74 }
75 break;
76 }
77 case sizeof(u32): {
78 __le32 *buf = buffer;
79
80 WARN_ON(count & 3);
81 while (count) {
82 *buf = (__force __le32)__raw_readl(addr);
83 buf++;
84 count -= 4;
85 }
86 break;
87 }
88 default:
89 WARN_ON(1);
90 }
91}
92
93static void bcma_host_soc_block_write(struct bcma_device *core,
94 const void *buffer,
95 size_t count, u16 offset, u8 reg_width)
96{
97 void __iomem *addr = core->io_addr + offset;
98
99 switch (reg_width) {
100 case sizeof(u8): {
101 const u8 *buf = buffer;
102
103 while (count) {
104 __raw_writeb(*buf, addr);
105 buf++;
106 count--;
107 }
108 break;
109 }
110 case sizeof(u16): {
111 const __le16 *buf = buffer;
112
113 WARN_ON(count & 1);
114 while (count) {
115 __raw_writew((__force u16)(*buf), addr);
116 buf++;
117 count -= 2;
118 }
119 break;
120 }
121 case sizeof(u32): {
122 const __le32 *buf = buffer;
123
124 WARN_ON(count & 3);
125 while (count) {
126 __raw_writel((__force u32)(*buf), addr);
127 buf++;
128 count -= 4;
129 }
130 break;
131 }
132 default:
133 WARN_ON(1);
134 }
135}
136#endif /* CONFIG_BCMA_BLOCKIO */
137
138static u32 bcma_host_soc_aread32(struct bcma_device *core, u16 offset)
139{
140 if (WARN_ONCE(!core->io_wrap, "Accessed core has no wrapper/agent\n"))
141 return ~0;
142 return readl(core->io_wrap + offset);
143}
144
145static void bcma_host_soc_awrite32(struct bcma_device *core, u16 offset,
146 u32 value)
147{
148 if (WARN_ONCE(!core->io_wrap, "Accessed core has no wrapper/agent\n"))
149 return;
150 writel(value, core->io_wrap + offset);
151}
152
153static const struct bcma_host_ops bcma_host_soc_ops = {
154 .read8 = bcma_host_soc_read8,
155 .read16 = bcma_host_soc_read16,
156 .read32 = bcma_host_soc_read32,
157 .write8 = bcma_host_soc_write8,
158 .write16 = bcma_host_soc_write16,
159 .write32 = bcma_host_soc_write32,
160#ifdef CONFIG_BCMA_BLOCKIO
161 .block_read = bcma_host_soc_block_read,
162 .block_write = bcma_host_soc_block_write,
163#endif
164 .aread32 = bcma_host_soc_aread32,
165 .awrite32 = bcma_host_soc_awrite32,
166};
167
168int __init bcma_host_soc_register(struct bcma_soc *soc)
169{
170 struct bcma_bus *bus = &soc->bus;
171
172 /* iomap only first core. We have to read some register on this core
173 * to scan the bus.
174 */
175 bus->mmio = ioremap(BCMA_ADDR_BASE, BCMA_CORE_SIZE * 1);
176 if (!bus->mmio)
177 return -ENOMEM;
178
179 /* Host specific */
180 bus->hosttype = BCMA_HOSTTYPE_SOC;
181 bus->ops = &bcma_host_soc_ops;
182
183 /* Initialize struct, detect chip */
184 bcma_init_bus(bus);
185
186 return 0;
187}
188
189int __init bcma_host_soc_init(struct bcma_soc *soc)
190{
191 struct bcma_bus *bus = &soc->bus;
192 int err;
193
194 /* Scan bus and initialize it */
195 err = bcma_bus_early_register(bus);
196 if (err)
197 iounmap(bus->mmio);
198
199 return err;
200}
201
202#ifdef CONFIG_OF
203static int bcma_host_soc_probe(struct platform_device *pdev)
204{
205 struct device *dev = &pdev->dev;
206 struct device_node *np = dev->of_node;
207 struct bcma_bus *bus;
208 int err;
209
210 /* Alloc */
211 bus = devm_kzalloc(dev, sizeof(*bus), GFP_KERNEL);
212 if (!bus)
213 return -ENOMEM;
214
215 bus->dev = dev;
216
217 /* Map MMIO */
218 bus->mmio = of_iomap(np, 0);
219 if (!bus->mmio)
220 return -ENOMEM;
221
222 /* Host specific */
223 bus->hosttype = BCMA_HOSTTYPE_SOC;
224 bus->ops = &bcma_host_soc_ops;
225
226 /* Initialize struct, detect chip */
227 bcma_init_bus(bus);
228
229 /* Register */
230 err = bcma_bus_register(bus);
231 if (err)
232 goto err_unmap_mmio;
233
234 platform_set_drvdata(pdev, bus);
235
236 return err;
237
238err_unmap_mmio:
239 iounmap(bus->mmio);
240 return err;
241}
242
243static void bcma_host_soc_remove(struct platform_device *pdev)
244{
245 struct bcma_bus *bus = platform_get_drvdata(pdev);
246
247 bcma_bus_unregister(bus);
248 iounmap(bus->mmio);
249 platform_set_drvdata(pdev, NULL);
250}
251
252static const struct of_device_id bcma_host_soc_of_match[] = {
253 { .compatible = "brcm,bus-axi", },
254 {},
255};
256MODULE_DEVICE_TABLE(of, bcma_host_soc_of_match);
257
258static struct platform_driver bcma_host_soc_driver = {
259 .driver = {
260 .name = "bcma-host-soc",
261 .of_match_table = bcma_host_soc_of_match,
262 },
263 .probe = bcma_host_soc_probe,
264 .remove = bcma_host_soc_remove,
265};
266
267int __init bcma_host_soc_register_driver(void)
268{
269 return platform_driver_register(&bcma_host_soc_driver);
270}
271
272void __exit bcma_host_soc_unregister_driver(void)
273{
274 platform_driver_unregister(&bcma_host_soc_driver);
275}
276#endif /* CONFIG_OF */