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1/* central.c: Central FHC driver for Sunfire/Starfire/Wildfire.
2 *
3 * Copyright (C) 1997, 1999, 2008 David S. Miller (davem@davemloft.net)
4 */
5
6#include <linux/kernel.h>
7#include <linux/types.h>
8#include <linux/slab.h>
9#include <linux/export.h>
10#include <linux/string.h>
11#include <linux/init.h>
12#include <linux/of_device.h>
13#include <linux/platform_device.h>
14
15#include <asm/fhc.h>
16#include <asm/upa.h>
17
18struct clock_board {
19 void __iomem *clock_freq_regs;
20 void __iomem *clock_regs;
21 void __iomem *clock_ver_reg;
22 int num_slots;
23 struct resource leds_resource;
24 struct platform_device leds_pdev;
25};
26
27struct fhc {
28 void __iomem *pregs;
29 bool central;
30 bool jtag_master;
31 int board_num;
32 struct resource leds_resource;
33 struct platform_device leds_pdev;
34};
35
36static int __devinit clock_board_calc_nslots(struct clock_board *p)
37{
38 u8 reg = upa_readb(p->clock_regs + CLOCK_STAT1) & 0xc0;
39
40 switch (reg) {
41 case 0x40:
42 return 16;
43
44 case 0xc0:
45 return 8;
46
47 case 0x80:
48 reg = 0;
49 if (p->clock_ver_reg)
50 reg = upa_readb(p->clock_ver_reg);
51 if (reg) {
52 if (reg & 0x80)
53 return 4;
54 else
55 return 5;
56 }
57 /* Fallthrough */
58 default:
59 return 4;
60 }
61}
62
63static int __devinit clock_board_probe(struct platform_device *op)
64{
65 struct clock_board *p = kzalloc(sizeof(*p), GFP_KERNEL);
66 int err = -ENOMEM;
67
68 if (!p) {
69 printk(KERN_ERR "clock_board: Cannot allocate struct clock_board\n");
70 goto out;
71 }
72
73 p->clock_freq_regs = of_ioremap(&op->resource[0], 0,
74 resource_size(&op->resource[0]),
75 "clock_board_freq");
76 if (!p->clock_freq_regs) {
77 printk(KERN_ERR "clock_board: Cannot map clock_freq_regs\n");
78 goto out_free;
79 }
80
81 p->clock_regs = of_ioremap(&op->resource[1], 0,
82 resource_size(&op->resource[1]),
83 "clock_board_regs");
84 if (!p->clock_regs) {
85 printk(KERN_ERR "clock_board: Cannot map clock_regs\n");
86 goto out_unmap_clock_freq_regs;
87 }
88
89 if (op->resource[2].flags) {
90 p->clock_ver_reg = of_ioremap(&op->resource[2], 0,
91 resource_size(&op->resource[2]),
92 "clock_ver_reg");
93 if (!p->clock_ver_reg) {
94 printk(KERN_ERR "clock_board: Cannot map clock_ver_reg\n");
95 goto out_unmap_clock_regs;
96 }
97 }
98
99 p->num_slots = clock_board_calc_nslots(p);
100
101 p->leds_resource.start = (unsigned long)
102 (p->clock_regs + CLOCK_CTRL);
103 p->leds_resource.end = p->leds_resource.start;
104 p->leds_resource.name = "leds";
105
106 p->leds_pdev.name = "sunfire-clockboard-leds";
107 p->leds_pdev.id = -1;
108 p->leds_pdev.resource = &p->leds_resource;
109 p->leds_pdev.num_resources = 1;
110 p->leds_pdev.dev.parent = &op->dev;
111
112 err = platform_device_register(&p->leds_pdev);
113 if (err) {
114 printk(KERN_ERR "clock_board: Could not register LEDS "
115 "platform device\n");
116 goto out_unmap_clock_ver_reg;
117 }
118
119 printk(KERN_INFO "clock_board: Detected %d slot Enterprise system.\n",
120 p->num_slots);
121
122 err = 0;
123out:
124 return err;
125
126out_unmap_clock_ver_reg:
127 if (p->clock_ver_reg)
128 of_iounmap(&op->resource[2], p->clock_ver_reg,
129 resource_size(&op->resource[2]));
130
131out_unmap_clock_regs:
132 of_iounmap(&op->resource[1], p->clock_regs,
133 resource_size(&op->resource[1]));
134
135out_unmap_clock_freq_regs:
136 of_iounmap(&op->resource[0], p->clock_freq_regs,
137 resource_size(&op->resource[0]));
138
139out_free:
140 kfree(p);
141 goto out;
142}
143
144static const struct of_device_id clock_board_match[] = {
145 {
146 .name = "clock-board",
147 },
148 {},
149};
150
151static struct platform_driver clock_board_driver = {
152 .probe = clock_board_probe,
153 .driver = {
154 .name = "clock_board",
155 .owner = THIS_MODULE,
156 .of_match_table = clock_board_match,
157 },
158};
159
160static int __devinit fhc_probe(struct platform_device *op)
161{
162 struct fhc *p = kzalloc(sizeof(*p), GFP_KERNEL);
163 int err = -ENOMEM;
164 u32 reg;
165
166 if (!p) {
167 printk(KERN_ERR "fhc: Cannot allocate struct fhc\n");
168 goto out;
169 }
170
171 if (!strcmp(op->dev.of_node->parent->name, "central"))
172 p->central = true;
173
174 p->pregs = of_ioremap(&op->resource[0], 0,
175 resource_size(&op->resource[0]),
176 "fhc_pregs");
177 if (!p->pregs) {
178 printk(KERN_ERR "fhc: Cannot map pregs\n");
179 goto out_free;
180 }
181
182 if (p->central) {
183 reg = upa_readl(p->pregs + FHC_PREGS_BSR);
184 p->board_num = ((reg >> 16) & 1) | ((reg >> 12) & 0x0e);
185 } else {
186 p->board_num = of_getintprop_default(op->dev.of_node, "board#", -1);
187 if (p->board_num == -1) {
188 printk(KERN_ERR "fhc: No board# property\n");
189 goto out_unmap_pregs;
190 }
191 if (upa_readl(p->pregs + FHC_PREGS_JCTRL) & FHC_JTAG_CTRL_MENAB)
192 p->jtag_master = true;
193 }
194
195 if (!p->central) {
196 p->leds_resource.start = (unsigned long)
197 (p->pregs + FHC_PREGS_CTRL);
198 p->leds_resource.end = p->leds_resource.start;
199 p->leds_resource.name = "leds";
200
201 p->leds_pdev.name = "sunfire-fhc-leds";
202 p->leds_pdev.id = p->board_num;
203 p->leds_pdev.resource = &p->leds_resource;
204 p->leds_pdev.num_resources = 1;
205 p->leds_pdev.dev.parent = &op->dev;
206
207 err = platform_device_register(&p->leds_pdev);
208 if (err) {
209 printk(KERN_ERR "fhc: Could not register LEDS "
210 "platform device\n");
211 goto out_unmap_pregs;
212 }
213 }
214 reg = upa_readl(p->pregs + FHC_PREGS_CTRL);
215
216 if (!p->central)
217 reg |= FHC_CONTROL_IXIST;
218
219 reg &= ~(FHC_CONTROL_AOFF |
220 FHC_CONTROL_BOFF |
221 FHC_CONTROL_SLINE);
222
223 upa_writel(reg, p->pregs + FHC_PREGS_CTRL);
224 upa_readl(p->pregs + FHC_PREGS_CTRL);
225
226 reg = upa_readl(p->pregs + FHC_PREGS_ID);
227 printk(KERN_INFO "fhc: Board #%d, Version[%x] PartID[%x] Manuf[%x] %s\n",
228 p->board_num,
229 (reg & FHC_ID_VERS) >> 28,
230 (reg & FHC_ID_PARTID) >> 12,
231 (reg & FHC_ID_MANUF) >> 1,
232 (p->jtag_master ?
233 "(JTAG Master)" :
234 (p->central ? "(Central)" : "")));
235
236 err = 0;
237
238out:
239 return err;
240
241out_unmap_pregs:
242 of_iounmap(&op->resource[0], p->pregs, resource_size(&op->resource[0]));
243
244out_free:
245 kfree(p);
246 goto out;
247}
248
249static const struct of_device_id fhc_match[] = {
250 {
251 .name = "fhc",
252 },
253 {},
254};
255
256static struct platform_driver fhc_driver = {
257 .probe = fhc_probe,
258 .driver = {
259 .name = "fhc",
260 .owner = THIS_MODULE,
261 .of_match_table = fhc_match,
262 },
263};
264
265static int __init sunfire_init(void)
266{
267 (void) platform_driver_register(&fhc_driver);
268 (void) platform_driver_register(&clock_board_driver);
269 return 0;
270}
271
272fs_initcall(sunfire_init);