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(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
183	/* Initialize struct, detect chip */
184	bcma_init_bus(bus);
185
186	return 0;
187}
188
189int __init bcma_host_soc_init(struct bcma_soc *soc)
190{
191	struct bcma_bus *bus = &soc->bus;
192	int err;
193
194	/* Scan bus and initialize it */
195	err = bcma_bus_early_register(bus);
196	if (err)
197		iounmap(bus->mmio);
198
199	return err;
200}
201
202#ifdef CONFIG_OF
203static int bcma_host_soc_probe(struct platform_device *pdev)
204{
205	struct device *dev = &pdev->dev;
206	struct device_node *np = dev->of_node;
207	struct bcma_bus *bus;
208	int err;
209
210	/* Alloc */
211	bus = devm_kzalloc(dev, sizeof(*bus), GFP_KERNEL);
212	if (!bus)
213		return -ENOMEM;
214
215	bus->dev = dev;
216
217	/* Map MMIO */
218	bus->mmio = of_iomap(np, 0);
219	if (!bus->mmio)
220		return -ENOMEM;
221
222	/* Host specific */
223	bus->hosttype = BCMA_HOSTTYPE_SOC;
224	bus->ops = &bcma_host_soc_ops;
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 */