1 /*
2 * B53 register access through memory mapped registers
3 *
4 * Copyright (C) 2012-2013 Jonas Gorski <jogo@openwrt.org>
5 *
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #include <linux/bits.h>
20 #include <linux/kernel.h>
21 #include <linux/module.h>
22 #include <linux/io.h>
23 #include <linux/platform_device.h>
24 #include <linux/platform_data/b53.h>
25
26 #include "b53_priv.h"
27
28 struct b53_mmap_priv {
29 void __iomem *regs;
30 };
31
b53_mmap_read8(struct b53_device * dev,u8 page,u8 reg,u8 * val)32 static int b53_mmap_read8(struct b53_device *dev, u8 page, u8 reg, u8 *val)
33 {
34 struct b53_mmap_priv *priv = dev->priv;
35 void __iomem *regs = priv->regs;
36
37 *val = readb(regs + (page << 8) + reg);
38
39 return 0;
40 }
41
b53_mmap_read16(struct b53_device * dev,u8 page,u8 reg,u16 * val)42 static int b53_mmap_read16(struct b53_device *dev, u8 page, u8 reg, u16 *val)
43 {
44 struct b53_mmap_priv *priv = dev->priv;
45 void __iomem *regs = priv->regs;
46
47 if (WARN_ON(reg % 2))
48 return -EINVAL;
49
50 if (dev->pdata && dev->pdata->big_endian)
51 *val = ioread16be(regs + (page << 8) + reg);
52 else
53 *val = readw(regs + (page << 8) + reg);
54
55 return 0;
56 }
57
b53_mmap_read32(struct b53_device * dev,u8 page,u8 reg,u32 * val)58 static int b53_mmap_read32(struct b53_device *dev, u8 page, u8 reg, u32 *val)
59 {
60 struct b53_mmap_priv *priv = dev->priv;
61 void __iomem *regs = priv->regs;
62
63 if (WARN_ON(reg % 4))
64 return -EINVAL;
65
66 if (dev->pdata && dev->pdata->big_endian)
67 *val = ioread32be(regs + (page << 8) + reg);
68 else
69 *val = readl(regs + (page << 8) + reg);
70
71 return 0;
72 }
73
b53_mmap_read48(struct b53_device * dev,u8 page,u8 reg,u64 * val)74 static int b53_mmap_read48(struct b53_device *dev, u8 page, u8 reg, u64 *val)
75 {
76 struct b53_mmap_priv *priv = dev->priv;
77 void __iomem *regs = priv->regs;
78
79 if (WARN_ON(reg % 2))
80 return -EINVAL;
81
82 if (reg % 4) {
83 u16 lo;
84 u32 hi;
85
86 if (dev->pdata && dev->pdata->big_endian) {
87 lo = ioread16be(regs + (page << 8) + reg);
88 hi = ioread32be(regs + (page << 8) + reg + 2);
89 } else {
90 lo = readw(regs + (page << 8) + reg);
91 hi = readl(regs + (page << 8) + reg + 2);
92 }
93
94 *val = ((u64)hi << 16) | lo;
95 } else {
96 u32 lo;
97 u16 hi;
98
99 if (dev->pdata && dev->pdata->big_endian) {
100 lo = ioread32be(regs + (page << 8) + reg);
101 hi = ioread16be(regs + (page << 8) + reg + 4);
102 } else {
103 lo = readl(regs + (page << 8) + reg);
104 hi = readw(regs + (page << 8) + reg + 4);
105 }
106
107 *val = ((u64)hi << 32) | lo;
108 }
109
110 return 0;
111 }
112
b53_mmap_read64(struct b53_device * dev,u8 page,u8 reg,u64 * val)113 static int b53_mmap_read64(struct b53_device *dev, u8 page, u8 reg, u64 *val)
114 {
115 struct b53_mmap_priv *priv = dev->priv;
116 void __iomem *regs = priv->regs;
117 u32 hi, lo;
118
119 if (WARN_ON(reg % 4))
120 return -EINVAL;
121
122 if (dev->pdata && dev->pdata->big_endian) {
123 lo = ioread32be(regs + (page << 8) + reg);
124 hi = ioread32be(regs + (page << 8) + reg + 4);
125 } else {
126 lo = readl(regs + (page << 8) + reg);
127 hi = readl(regs + (page << 8) + reg + 4);
128 }
129
130 *val = ((u64)hi << 32) | lo;
131
132 return 0;
133 }
134
b53_mmap_write8(struct b53_device * dev,u8 page,u8 reg,u8 value)135 static int b53_mmap_write8(struct b53_device *dev, u8 page, u8 reg, u8 value)
136 {
137 struct b53_mmap_priv *priv = dev->priv;
138 void __iomem *regs = priv->regs;
139
140 writeb(value, regs + (page << 8) + reg);
141
142 return 0;
143 }
144
b53_mmap_write16(struct b53_device * dev,u8 page,u8 reg,u16 value)145 static int b53_mmap_write16(struct b53_device *dev, u8 page, u8 reg,
146 u16 value)
147 {
148 struct b53_mmap_priv *priv = dev->priv;
149 void __iomem *regs = priv->regs;
150
151 if (WARN_ON(reg % 2))
152 return -EINVAL;
153
154 if (dev->pdata && dev->pdata->big_endian)
155 iowrite16be(value, regs + (page << 8) + reg);
156 else
157 writew(value, regs + (page << 8) + reg);
158
159 return 0;
160 }
161
b53_mmap_write32(struct b53_device * dev,u8 page,u8 reg,u32 value)162 static int b53_mmap_write32(struct b53_device *dev, u8 page, u8 reg,
163 u32 value)
164 {
165 struct b53_mmap_priv *priv = dev->priv;
166 void __iomem *regs = priv->regs;
167
168 if (WARN_ON(reg % 4))
169 return -EINVAL;
170
171 if (dev->pdata && dev->pdata->big_endian)
172 iowrite32be(value, regs + (page << 8) + reg);
173 else
174 writel(value, regs + (page << 8) + reg);
175
176 return 0;
177 }
178
b53_mmap_write48(struct b53_device * dev,u8 page,u8 reg,u64 value)179 static int b53_mmap_write48(struct b53_device *dev, u8 page, u8 reg,
180 u64 value)
181 {
182 if (WARN_ON(reg % 2))
183 return -EINVAL;
184
185 if (reg % 4) {
186 u32 hi = (u32)(value >> 16);
187 u16 lo = (u16)value;
188
189 b53_mmap_write16(dev, page, reg, lo);
190 b53_mmap_write32(dev, page, reg + 2, hi);
191 } else {
192 u16 hi = (u16)(value >> 32);
193 u32 lo = (u32)value;
194
195 b53_mmap_write32(dev, page, reg, lo);
196 b53_mmap_write16(dev, page, reg + 4, hi);
197 }
198
199 return 0;
200 }
201
b53_mmap_write64(struct b53_device * dev,u8 page,u8 reg,u64 value)202 static int b53_mmap_write64(struct b53_device *dev, u8 page, u8 reg,
203 u64 value)
204 {
205 u32 hi, lo;
206
207 hi = upper_32_bits(value);
208 lo = lower_32_bits(value);
209
210 if (WARN_ON(reg % 4))
211 return -EINVAL;
212
213 b53_mmap_write32(dev, page, reg, lo);
214 b53_mmap_write32(dev, page, reg + 4, hi);
215
216 return 0;
217 }
218
219 static const struct b53_io_ops b53_mmap_ops = {
220 .read8 = b53_mmap_read8,
221 .read16 = b53_mmap_read16,
222 .read32 = b53_mmap_read32,
223 .read48 = b53_mmap_read48,
224 .read64 = b53_mmap_read64,
225 .write8 = b53_mmap_write8,
226 .write16 = b53_mmap_write16,
227 .write32 = b53_mmap_write32,
228 .write48 = b53_mmap_write48,
229 .write64 = b53_mmap_write64,
230 };
231
b53_mmap_probe_of(struct platform_device * pdev,struct b53_platform_data ** ppdata)232 static int b53_mmap_probe_of(struct platform_device *pdev,
233 struct b53_platform_data **ppdata)
234 {
235 struct device_node *np = pdev->dev.of_node;
236 struct device_node *of_ports, *of_port;
237 struct device *dev = &pdev->dev;
238 struct b53_platform_data *pdata;
239 void __iomem *mem;
240
241 mem = devm_platform_ioremap_resource(pdev, 0);
242 if (IS_ERR(mem))
243 return PTR_ERR(mem);
244
245 pdata = devm_kzalloc(dev, sizeof(struct b53_platform_data),
246 GFP_KERNEL);
247 if (!pdata)
248 return -ENOMEM;
249
250 pdata->regs = mem;
251 pdata->chip_id = BCM63XX_DEVICE_ID;
252 pdata->big_endian = of_property_read_bool(np, "big-endian");
253
254 of_ports = of_get_child_by_name(np, "ports");
255 if (!of_ports) {
256 dev_err(dev, "no ports child node found\n");
257 return -EINVAL;
258 }
259
260 for_each_available_child_of_node(of_ports, of_port) {
261 u32 reg;
262
263 if (of_property_read_u32(of_port, "reg", ®))
264 continue;
265
266 if (reg < B53_CPU_PORT)
267 pdata->enabled_ports |= BIT(reg);
268 }
269
270 of_node_put(of_ports);
271 *ppdata = pdata;
272
273 return 0;
274 }
275
b53_mmap_probe(struct platform_device * pdev)276 static int b53_mmap_probe(struct platform_device *pdev)
277 {
278 struct device_node *np = pdev->dev.of_node;
279 struct b53_platform_data *pdata = pdev->dev.platform_data;
280 struct b53_mmap_priv *priv;
281 struct b53_device *dev;
282 int ret;
283
284 if (!pdata && np) {
285 ret = b53_mmap_probe_of(pdev, &pdata);
286 if (ret) {
287 dev_err(&pdev->dev, "OF probe error\n");
288 return ret;
289 }
290 }
291
292 if (!pdata)
293 return -EINVAL;
294
295 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
296 if (!priv)
297 return -ENOMEM;
298
299 priv->regs = pdata->regs;
300
301 dev = b53_switch_alloc(&pdev->dev, &b53_mmap_ops, priv);
302 if (!dev)
303 return -ENOMEM;
304
305 dev->pdata = pdata;
306
307 platform_set_drvdata(pdev, dev);
308
309 return b53_switch_register(dev);
310 }
311
b53_mmap_remove(struct platform_device * pdev)312 static int b53_mmap_remove(struct platform_device *pdev)
313 {
314 struct b53_device *dev = platform_get_drvdata(pdev);
315
316 if (dev)
317 b53_switch_remove(dev);
318
319 return 0;
320 }
321
b53_mmap_shutdown(struct platform_device * pdev)322 static void b53_mmap_shutdown(struct platform_device *pdev)
323 {
324 struct b53_device *dev = platform_get_drvdata(pdev);
325
326 if (dev)
327 b53_switch_shutdown(dev);
328
329 platform_set_drvdata(pdev, NULL);
330 }
331
332 static const struct of_device_id b53_mmap_of_table[] = {
333 { .compatible = "brcm,bcm3384-switch" },
334 { .compatible = "brcm,bcm6328-switch" },
335 { .compatible = "brcm,bcm6368-switch" },
336 { .compatible = "brcm,bcm63xx-switch" },
337 { /* sentinel */ },
338 };
339 MODULE_DEVICE_TABLE(of, b53_mmap_of_table);
340
341 static struct platform_driver b53_mmap_driver = {
342 .probe = b53_mmap_probe,
343 .remove = b53_mmap_remove,
344 .shutdown = b53_mmap_shutdown,
345 .driver = {
346 .name = "b53-switch",
347 .of_match_table = b53_mmap_of_table,
348 },
349 };
350
351 module_platform_driver(b53_mmap_driver);
352 MODULE_AUTHOR("Jonas Gorski <jogo@openwrt.org>");
353 MODULE_DESCRIPTION("B53 MMAP access driver");
354 MODULE_LICENSE("Dual BSD/GPL");
355
