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_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
190int __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
204static 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
238err_unmap_mmio:
239	iounmap(bus->mmio);
240	return err;
241}
242
243static 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
254static const struct of_device_id bcma_host_soc_of_match[] = {
255	{ .compatible = "brcm,bus-axi", },
256	{},
257};
258MODULE_DEVICE_TABLE(of, bcma_host_soc_of_match);
259
260static 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
269int __init bcma_host_soc_register_driver(void)
270{
271	return platform_driver_register(&bcma_host_soc_driver);
272}
273
274void __exit bcma_host_soc_unregister_driver(void)
275{
276	platform_driver_unregister(&bcma_host_soc_driver);
277}
278#endif /* CONFIG_OF */
279