summaryrefslogtreecommitdiffstats
path: root/arch/sparc/kernel/central.c
blob: 38d48a59879c1d2718f2c58eda37d42a8af5938e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
/* central.c: Central FHC driver for Sunfire/Starfire/Wildfire.
 *
 * Copyright (C) 1997, 1999, 2008 David S. Miller (davem@davemloft.net)
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>

#include <asm/fhc.h>
#include <asm/upa.h>

struct clock_board {
	void __iomem		*clock_freq_regs;
	void __iomem		*clock_regs;
	void __iomem		*clock_ver_reg;
	int			num_slots;
	struct resource		leds_resource;
	struct platform_device	leds_pdev;
};

struct fhc {
	void __iomem		*pregs;
	bool			central;
	bool			jtag_master;
	int			board_num;
	struct resource		leds_resource;
	struct platform_device	leds_pdev;
};

static int __devinit clock_board_calc_nslots(struct clock_board *p)
{
	u8 reg = upa_readb(p->clock_regs + CLOCK_STAT1) & 0xc0;

	switch (reg) {
	case 0x40:
		return 16;

	case 0xc0:
		return 8;

	case 0x80:
		reg = 0;
		if (p->clock_ver_reg)
			reg = upa_readb(p->clock_ver_reg);
		if (reg) {
			if (reg & 0x80)
				return 4;
			else
				return 5;
		}
		/* Fallthrough */
	default:
		return 4;
	}
}

static int __devinit clock_board_probe(struct platform_device *op)
{
	struct clock_board *p = kzalloc(sizeof(*p), GFP_KERNEL);
	int err = -ENOMEM;

	if (!p) {
		printk(KERN_ERR "clock_board: Cannot allocate struct clock_board\n");
		goto out;
	}

	p->clock_freq_regs = of_ioremap(&op->resource[0], 0,
					resource_size(&op->resource[0]),
					"clock_board_freq");
	if (!p->clock_freq_regs) {
		printk(KERN_ERR "clock_board: Cannot map clock_freq_regs\n");
		goto out_free;
	}

	p->clock_regs = of_ioremap(&op->resource[1], 0,
				   resource_size(&op->resource[1]),
				   "clock_board_regs");
	if (!p->clock_regs) {
		printk(KERN_ERR "clock_board: Cannot map clock_regs\n");
		goto out_unmap_clock_freq_regs;
	}

	if (op->resource[2].flags) {
		p->clock_ver_reg = of_ioremap(&op->resource[2], 0,
					      resource_size(&op->resource[2]),
					      "clock_ver_reg");
		if (!p->clock_ver_reg) {
			printk(KERN_ERR "clock_board: Cannot map clock_ver_reg\n");
			goto out_unmap_clock_regs;
		}
	}

	p->num_slots = clock_board_calc_nslots(p);

	p->leds_resource.start = (unsigned long)
		(p->clock_regs + CLOCK_CTRL);
	p->leds_resource.end = p->leds_resource.start;
	p->leds_resource.name = "leds";

	p->leds_pdev.name = "sunfire-clockboard-leds";
	p->leds_pdev.id = -1;
	p->leds_pdev.resource = &p->leds_resource;
	p->leds_pdev.num_resources = 1;
	p->leds_pdev.dev.parent = &op->dev;

	err = platform_device_register(&p->leds_pdev);
	if (err) {
		printk(KERN_ERR "clock_board: Could not register LEDS "
		       "platform device\n");
		goto out_unmap_clock_ver_reg;
	}

	printk(KERN_INFO "clock_board: Detected %d slot Enterprise system.\n",
	       p->num_slots);

	err = 0;
out:
	return err;

out_unmap_clock_ver_reg:
	if (p->clock_ver_reg)
		of_iounmap(&op->resource[2], p->clock_ver_reg,
			   resource_size(&op->resource[2]));

out_unmap_clock_regs:
	of_iounmap(&op->resource[1], p->clock_regs,
		   resource_size(&op->resource[1]));

out_unmap_clock_freq_regs:
	of_iounmap(&op->resource[0], p->clock_freq_regs,
		   resource_size(&op->resource[0]));

out_free:
	kfree(p);
	goto out;
}

static const struct of_device_id clock_board_match[] = {
	{
		.name = "clock-board",
	},
	{},
};

static struct platform_driver clock_board_driver = {
	.probe		= clock_board_probe,
	.driver = {
		.name = "clock_board",
		.owner = THIS_MODULE,
		.of_match_table = clock_board_match,
	},
};

static int __devinit fhc_probe(struct platform_device *op)
{
	struct fhc *p = kzalloc(sizeof(*p), GFP_KERNEL);
	int err = -ENOMEM;
	u32 reg;

	if (!p) {
		printk(KERN_ERR "fhc: Cannot allocate struct fhc\n");
		goto out;
	}

	if (!strcmp(op->dev.of_node->parent->name, "central"))
		p->central = true;

	p->pregs = of_ioremap(&op->resource[0], 0,
			      resource_size(&op->resource[0]),
			      "fhc_pregs");
	if (!p->pregs) {
		printk(KERN_ERR "fhc: Cannot map pregs\n");
		goto out_free;
	}

	if (p->central) {
		reg = upa_readl(p->pregs + FHC_PREGS_BSR);
		p->board_num = ((reg >> 16) & 1) | ((reg >> 12) & 0x0e);
	} else {
		p->board_num = of_getintprop_default(op->dev.of_node, "board#", -1);
		if (p->board_num == -1) {
			printk(KERN_ERR "fhc: No board# property\n");
			goto out_unmap_pregs;
		}
		if (upa_readl(p->pregs + FHC_PREGS_JCTRL) & FHC_JTAG_CTRL_MENAB)
			p->jtag_master = true;
	}

	if (!p->central) {
		p->leds_resource.start = (unsigned long)
			(p->pregs + FHC_PREGS_CTRL);
		p->leds_resource.end = p->leds_resource.start;
		p->leds_resource.name = "leds";

		p->leds_pdev.name = "sunfire-fhc-leds";
		p->leds_pdev.id = p->board_num;
		p->leds_pdev.resource = &p->leds_resource;
		p->leds_pdev.num_resources = 1;
		p->leds_pdev.dev.parent = &op->dev;

		err = platform_device_register(&p->leds_pdev);
		if (err) {
			printk(KERN_ERR "fhc: Could not register LEDS "
			       "platform device\n");
			goto out_unmap_pregs;
		}
	}
	reg = upa_readl(p->pregs + FHC_PREGS_CTRL);

	if (!p->central)
		reg |= FHC_CONTROL_IXIST;

	reg &= ~(FHC_CONTROL_AOFF |
		 FHC_CONTROL_BOFF |
		 FHC_CONTROL_SLINE);

	upa_writel(reg, p->pregs + FHC_PREGS_CTRL);
	upa_readl(p->pregs + FHC_PREGS_CTRL);

	reg = upa_readl(p->pregs + FHC_PREGS_ID);
	printk(KERN_INFO "fhc: Board #%d, Version[%x] PartID[%x] Manuf[%x] %s\n",
	       p->board_num,
	       (reg & FHC_ID_VERS) >> 28,
	       (reg & FHC_ID_PARTID) >> 12,
	       (reg & FHC_ID_MANUF) >> 1,
	       (p->jtag_master ?
		"(JTAG Master)" :
		(p->central ? "(Central)" : "")));

	err = 0;

out:
	return err;

out_unmap_pregs:
	of_iounmap(&op->resource[0], p->pregs, resource_size(&op->resource[0]));

out_free:
	kfree(p);
	goto out;
}

static const struct of_device_id fhc_match[] = {
	{
		.name = "fhc",
	},
	{},
};

static struct platform_driver fhc_driver = {
	.probe		= fhc_probe,
	.driver = {
		.name = "fhc",
		.owner = THIS_MODULE,
		.of_match_table = fhc_match,
	},
};

static int __init sunfire_init(void)
{
	(void) platform_driver_register(&fhc_driver);
	(void) platform_driver_register(&clock_board_driver);
	return 0;
}

subsys_initcall(sunfire_init);
OpenPOWER on IntegriCloud