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/of.h>
23 #include <linux/io.h>
24 #include <linux/platform_device.h>
25 #include <linux/platform_data/b53.h>
26
27 #include "b53_priv.h"
28
29 struct b53_mmap_priv {
30 void __iomem *regs;
31 };
32
b53_mmap_read8(struct b53_device * dev,u8 page,u8 reg,u8 * val)33 static int b53_mmap_read8(struct b53_device *dev, u8 page, u8 reg, u8 *val)
34 {
35 struct b53_mmap_priv *priv = dev->priv;
36 void __iomem *regs = priv->regs;
37
38 *val = readb(regs + (page << 8) + reg);
39
40 return 0;
41 }
42
b53_mmap_read16(struct b53_device * dev,u8 page,u8 reg,u16 * val)43 static int b53_mmap_read16(struct b53_device *dev, u8 page, u8 reg, u16 *val)
44 {
45 struct b53_mmap_priv *priv = dev->priv;
46 void __iomem *regs = priv->regs;
47
48 if (WARN_ON(reg % 2))
49 return -EINVAL;
50
51 if (dev->pdata && dev->pdata->big_endian)
52 *val = ioread16be(regs + (page << 8) + reg);
53 else
54 *val = readw(regs + (page << 8) + reg);
55
56 return 0;
57 }
58
b53_mmap_read32(struct b53_device * dev,u8 page,u8 reg,u32 * val)59 static int b53_mmap_read32(struct b53_device *dev, u8 page, u8 reg, u32 *val)
60 {
61 struct b53_mmap_priv *priv = dev->priv;
62 void __iomem *regs = priv->regs;
63
64 if (WARN_ON(reg % 4))
65 return -EINVAL;
66
67 if (dev->pdata && dev->pdata->big_endian)
68 *val = ioread32be(regs + (page << 8) + reg);
69 else
70 *val = readl(regs + (page << 8) + reg);
71
72 return 0;
73 }
74
b53_mmap_read48(struct b53_device * dev,u8 page,u8 reg,u64 * val)75 static int b53_mmap_read48(struct b53_device *dev, u8 page, u8 reg, u64 *val)
76 {
77 struct b53_mmap_priv *priv = dev->priv;
78 void __iomem *regs = priv->regs;
79
80 if (WARN_ON(reg % 2))
81 return -EINVAL;
82
83 if (reg % 4) {
84 u16 lo;
85 u32 hi;
86
87 if (dev->pdata && dev->pdata->big_endian) {
88 lo = ioread16be(regs + (page << 8) + reg);
89 hi = ioread32be(regs + (page << 8) + reg + 2);
90 } else {
91 lo = readw(regs + (page << 8) + reg);
92 hi = readl(regs + (page << 8) + reg + 2);
93 }
94
95 *val = ((u64)hi << 16) | lo;
96 } else {
97 u32 lo;
98 u16 hi;
99
100 if (dev->pdata && dev->pdata->big_endian) {
101 lo = ioread32be(regs + (page << 8) + reg);
102 hi = ioread16be(regs + (page << 8) + reg + 4);
103 } else {
104 lo = readl(regs + (page << 8) + reg);
105 hi = readw(regs + (page << 8) + reg + 4);
106 }
107
108 *val = ((u64)hi << 32) | lo;
109 }
110
111 return 0;
112 }
113
b53_mmap_read64(struct b53_device * dev,u8 page,u8 reg,u64 * val)114 static int b53_mmap_read64(struct b53_device *dev, u8 page, u8 reg, u64 *val)
115 {
116 struct b53_mmap_priv *priv = dev->priv;
117 void __iomem *regs = priv->regs;
118 u32 hi, lo;
119
120 if (WARN_ON(reg % 4))
121 return -EINVAL;
122
123 if (dev->pdata && dev->pdata->big_endian) {
124 lo = ioread32be(regs + (page << 8) + reg);
125 hi = ioread32be(regs + (page << 8) + reg + 4);
126 } else {
127 lo = readl(regs + (page << 8) + reg);
128 hi = readl(regs + (page << 8) + reg + 4);
129 }
130
131 *val = ((u64)hi << 32) | lo;
132
133 return 0;
134 }
135
b53_mmap_write8(struct b53_device * dev,u8 page,u8 reg,u8 value)136 static int b53_mmap_write8(struct b53_device *dev, u8 page, u8 reg, u8 value)
137 {
138 struct b53_mmap_priv *priv = dev->priv;
139 void __iomem *regs = priv->regs;
140
141 writeb(value, regs + (page << 8) + reg);
142
143 return 0;
144 }
145
b53_mmap_write16(struct b53_device * dev,u8 page,u8 reg,u16 value)146 static int b53_mmap_write16(struct b53_device *dev, u8 page, u8 reg,
147 u16 value)
148 {
149 struct b53_mmap_priv *priv = dev->priv;
150 void __iomem *regs = priv->regs;
151
152 if (WARN_ON(reg % 2))
153 return -EINVAL;
154
155 if (dev->pdata && dev->pdata->big_endian)
156 iowrite16be(value, regs + (page << 8) + reg);
157 else
158 writew(value, regs + (page << 8) + reg);
159
160 return 0;
161 }
162
b53_mmap_write32(struct b53_device * dev,u8 page,u8 reg,u32 value)163 static int b53_mmap_write32(struct b53_device *dev, u8 page, u8 reg,
164 u32 value)
165 {
166 struct b53_mmap_priv *priv = dev->priv;
167 void __iomem *regs = priv->regs;
168
169 if (WARN_ON(reg % 4))
170 return -EINVAL;
171
172 if (dev->pdata && dev->pdata->big_endian)
173 iowrite32be(value, regs + (page << 8) + reg);
174 else
175 writel(value, regs + (page << 8) + reg);
176
177 return 0;
178 }
179
b53_mmap_write48(struct b53_device * dev,u8 page,u8 reg,u64 value)180 static int b53_mmap_write48(struct b53_device *dev, u8 page, u8 reg,
181 u64 value)
182 {
183 if (WARN_ON(reg % 2))
184 return -EINVAL;
185
186 if (reg % 4) {
187 u32 hi = (u32)(value >> 16);
188 u16 lo = (u16)value;
189
190 b53_mmap_write16(dev, page, reg, lo);
191 b53_mmap_write32(dev, page, reg + 2, hi);
192 } else {
193 u16 hi = (u16)(value >> 32);
194 u32 lo = (u32)value;
195
196 b53_mmap_write32(dev, page, reg, lo);
197 b53_mmap_write16(dev, page, reg + 4, hi);
198 }
199
200 return 0;
201 }
202
b53_mmap_write64(struct b53_device * dev,u8 page,u8 reg,u64 value)203 static int b53_mmap_write64(struct b53_device *dev, u8 page, u8 reg,
204 u64 value)
205 {
206 u32 hi, lo;
207
208 hi = upper_32_bits(value);
209 lo = lower_32_bits(value);
210
211 if (WARN_ON(reg % 4))
212 return -EINVAL;
213
214 b53_mmap_write32(dev, page, reg, lo);
215 b53_mmap_write32(dev, page, reg + 4, hi);
216
217 return 0;
218 }
219
b53_mmap_phy_read16(struct b53_device * dev,int addr,int reg,u16 * value)220 static int b53_mmap_phy_read16(struct b53_device *dev, int addr, int reg,
221 u16 *value)
222 {
223 return -EIO;
224 }
225
b53_mmap_phy_write16(struct b53_device * dev,int addr,int reg,u16 value)226 static int b53_mmap_phy_write16(struct b53_device *dev, int addr, int reg,
227 u16 value)
228 {
229 return -EIO;
230 }
231
232 static const struct b53_io_ops b53_mmap_ops = {
233 .read8 = b53_mmap_read8,
234 .read16 = b53_mmap_read16,
235 .read32 = b53_mmap_read32,
236 .read48 = b53_mmap_read48,
237 .read64 = b53_mmap_read64,
238 .write8 = b53_mmap_write8,
239 .write16 = b53_mmap_write16,
240 .write32 = b53_mmap_write32,
241 .write48 = b53_mmap_write48,
242 .write64 = b53_mmap_write64,
243 .phy_read16 = b53_mmap_phy_read16,
244 .phy_write16 = b53_mmap_phy_write16,
245 };
246
b53_mmap_probe_of(struct platform_device * pdev,struct b53_platform_data ** ppdata)247 static int b53_mmap_probe_of(struct platform_device *pdev,
248 struct b53_platform_data **ppdata)
249 {
250 struct device_node *np = pdev->dev.of_node;
251 struct device_node *of_ports, *of_port;
252 struct device *dev = &pdev->dev;
253 struct b53_platform_data *pdata;
254 void __iomem *mem;
255
256 mem = devm_platform_ioremap_resource(pdev, 0);
257 if (IS_ERR(mem))
258 return PTR_ERR(mem);
259
260 pdata = devm_kzalloc(dev, sizeof(struct b53_platform_data),
261 GFP_KERNEL);
262 if (!pdata)
263 return -ENOMEM;
264
265 pdata->regs = mem;
266 pdata->chip_id = (u32)(unsigned long)device_get_match_data(dev);
267 pdata->big_endian = of_property_read_bool(np, "big-endian");
268
269 of_ports = of_get_child_by_name(np, "ports");
270 if (!of_ports) {
271 dev_err(dev, "no ports child node found\n");
272 return -EINVAL;
273 }
274
275 for_each_available_child_of_node(of_ports, of_port) {
276 u32 reg;
277
278 if (of_property_read_u32(of_port, "reg", ®))
279 continue;
280
281 if (reg < B53_N_PORTS)
282 pdata->enabled_ports |= BIT(reg);
283 }
284
285 of_node_put(of_ports);
286 *ppdata = pdata;
287
288 return 0;
289 }
290
b53_mmap_probe(struct platform_device * pdev)291 static int b53_mmap_probe(struct platform_device *pdev)
292 {
293 struct device_node *np = pdev->dev.of_node;
294 struct b53_platform_data *pdata = pdev->dev.platform_data;
295 struct b53_mmap_priv *priv;
296 struct b53_device *dev;
297 int ret;
298
299 if (!pdata && np) {
300 ret = b53_mmap_probe_of(pdev, &pdata);
301 if (ret) {
302 dev_err(&pdev->dev, "OF probe error\n");
303 return ret;
304 }
305 }
306
307 if (!pdata)
308 return -EINVAL;
309
310 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
311 if (!priv)
312 return -ENOMEM;
313
314 priv->regs = pdata->regs;
315
316 dev = b53_switch_alloc(&pdev->dev, &b53_mmap_ops, priv);
317 if (!dev)
318 return -ENOMEM;
319
320 dev->pdata = pdata;
321
322 platform_set_drvdata(pdev, dev);
323
324 return b53_switch_register(dev);
325 }
326
b53_mmap_remove(struct platform_device * pdev)327 static void b53_mmap_remove(struct platform_device *pdev)
328 {
329 struct b53_device *dev = platform_get_drvdata(pdev);
330
331 if (dev)
332 b53_switch_remove(dev);
333 }
334
b53_mmap_shutdown(struct platform_device * pdev)335 static void b53_mmap_shutdown(struct platform_device *pdev)
336 {
337 struct b53_device *dev = platform_get_drvdata(pdev);
338
339 if (dev)
340 b53_switch_shutdown(dev);
341
342 platform_set_drvdata(pdev, NULL);
343 }
344
345 static const struct of_device_id b53_mmap_of_table[] = {
346 {
347 .compatible = "brcm,bcm3384-switch",
348 .data = (void *)BCM63XX_DEVICE_ID,
349 }, {
350 .compatible = "brcm,bcm6318-switch",
351 .data = (void *)BCM63268_DEVICE_ID,
352 }, {
353 .compatible = "brcm,bcm6328-switch",
354 .data = (void *)BCM63XX_DEVICE_ID,
355 }, {
356 .compatible = "brcm,bcm6362-switch",
357 .data = (void *)BCM63XX_DEVICE_ID,
358 }, {
359 .compatible = "brcm,bcm6368-switch",
360 .data = (void *)BCM63XX_DEVICE_ID,
361 }, {
362 .compatible = "brcm,bcm63268-switch",
363 .data = (void *)BCM63268_DEVICE_ID,
364 }, {
365 .compatible = "brcm,bcm63xx-switch",
366 .data = (void *)BCM63XX_DEVICE_ID,
367 }, { /* sentinel */ }
368 };
369 MODULE_DEVICE_TABLE(of, b53_mmap_of_table);
370
371 static struct platform_driver b53_mmap_driver = {
372 .probe = b53_mmap_probe,
373 .remove_new = b53_mmap_remove,
374 .shutdown = b53_mmap_shutdown,
375 .driver = {
376 .name = "b53-switch",
377 .of_match_table = b53_mmap_of_table,
378 },
379 };
380
381 module_platform_driver(b53_mmap_driver);
382 MODULE_AUTHOR("Jonas Gorski <jogo@openwrt.org>");
383 MODULE_DESCRIPTION("B53 MMAP access driver");
384 MODULE_LICENSE("Dual BSD/GPL");
385