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
 28struct b53_mmap_priv {
 29	void __iomem *regs;
 30};
 31
 32static 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
 42static 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
 58static 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
 74static 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
113static 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
135static 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
145static 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
162static 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
179static 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
202static 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
219static 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
232static 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", &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
276static 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
312static 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
322static 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
332static 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};
339MODULE_DEVICE_TABLE(of, b53_mmap_of_table);
340
341static 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
351module_platform_driver(b53_mmap_driver);
352MODULE_AUTHOR("Jonas Gorski <jogo@openwrt.org>");
353MODULE_DESCRIPTION("B53 MMAP access driver");
354MODULE_LICENSE("Dual BSD/GPL");