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
bcma_host_soc_read8(struct bcma_device * core,u16 offset)16 static u8 bcma_host_soc_read8(struct bcma_device *core, u16 offset)
17 {
18 return readb(core->io_addr + offset);
19 }
20
bcma_host_soc_read16(struct bcma_device * core,u16 offset)21 static u16 bcma_host_soc_read16(struct bcma_device *core, u16 offset)
22 {
23 return readw(core->io_addr + offset);
24 }
25
bcma_host_soc_read32(struct bcma_device * core,u16 offset)26 static u32 bcma_host_soc_read32(struct bcma_device *core, u16 offset)
27 {
28 return readl(core->io_addr + offset);
29 }
30
bcma_host_soc_write8(struct bcma_device * core,u16 offset,u8 value)31 static void bcma_host_soc_write8(struct bcma_device *core, u16 offset,
32 u8 value)
33 {
34 writeb(value, core->io_addr + offset);
35 }
36
bcma_host_soc_write16(struct bcma_device * core,u16 offset,u16 value)37 static void bcma_host_soc_write16(struct bcma_device *core, u16 offset,
38 u16 value)
39 {
40 writew(value, core->io_addr + offset);
41 }
42
bcma_host_soc_write32(struct bcma_device * core,u16 offset,u32 value)43 static 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
bcma_host_soc_block_read(struct bcma_device * core,void * buffer,size_t count,u16 offset,u8 reg_width)50 static 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
bcma_host_soc_block_write(struct bcma_device * core,const void * buffer,size_t count,u16 offset,u8 reg_width)93 static 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
bcma_host_soc_aread32(struct bcma_device * core,u16 offset)138 static 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
bcma_host_soc_awrite32(struct bcma_device * core,u16 offset,u32 value)145 static 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
153 static 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
bcma_host_soc_register(struct bcma_soc * soc)168 int __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_nocache(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 bus->host_pdev = NULL;
183
184 /* Initialize struct, detect chip */
185 bcma_init_bus(bus);
186
187 return 0;
188 }
189
bcma_host_soc_init(struct bcma_soc * soc)190 int __init bcma_host_soc_init(struct bcma_soc *soc)
191 {
192 struct bcma_bus *bus = &soc->bus;
193 int err;
194
195 /* Scan bus and initialize it */
196 err = bcma_bus_early_register(bus);
197 if (err)
198 iounmap(bus->mmio);
199
200 return err;
201 }
202
203 #ifdef CONFIG_OF
bcma_host_soc_probe(struct platform_device * pdev)204 static int bcma_host_soc_probe(struct platform_device *pdev)
205 {
206 struct device *dev = &pdev->dev;
207 struct device_node *np = dev->of_node;
208 struct bcma_bus *bus;
209 int err;
210
211 /* Alloc */
212 bus = devm_kzalloc(dev, sizeof(*bus), GFP_KERNEL);
213 if (!bus)
214 return -ENOMEM;
215
216 /* Map MMIO */
217 bus->mmio = of_iomap(np, 0);
218 if (!bus->mmio)
219 return -ENOMEM;
220
221 /* Host specific */
222 bus->hosttype = BCMA_HOSTTYPE_SOC;
223 bus->ops = &bcma_host_soc_ops;
224 bus->host_pdev = pdev;
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
238 err_unmap_mmio:
239 iounmap(bus->mmio);
240 return err;
241 }
242
bcma_host_soc_remove(struct platform_device * pdev)243 static int 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 return 0;
252 }
253
254 static const struct of_device_id bcma_host_soc_of_match[] = {
255 { .compatible = "brcm,bus-axi", },
256 {},
257 };
258 MODULE_DEVICE_TABLE(of, bcma_host_soc_of_match);
259
260 static struct platform_driver bcma_host_soc_driver = {
261 .driver = {
262 .name = "bcma-host-soc",
263 .of_match_table = bcma_host_soc_of_match,
264 },
265 .probe = bcma_host_soc_probe,
266 .remove = bcma_host_soc_remove,
267 };
268
bcma_host_soc_register_driver(void)269 int __init bcma_host_soc_register_driver(void)
270 {
271 return platform_driver_register(&bcma_host_soc_driver);
272 }
273
bcma_host_soc_unregister_driver(void)274 void __exit bcma_host_soc_unregister_driver(void)
275 {
276 platform_driver_unregister(&bcma_host_soc_driver);
277 }
278 #endif /* CONFIG_OF */
279