1 // SPDX-License-Identifier: GPL-2.0
2 /* central.c: Central FHC driver for Sunfire/Starfire/Wildfire.
3 *
4 * Copyright (C) 1997, 1999, 2008 David S. Miller (davem@davemloft.net)
5 */
6
7 #include <linux/kernel.h>
8 #include <linux/types.h>
9 #include <linux/slab.h>
10 #include <linux/export.h>
11 #include <linux/string.h>
12 #include <linux/init.h>
13 #include <linux/of.h>
14 #include <linux/platform_device.h>
15
16 #include <asm/fhc.h>
17 #include <asm/upa.h>
18
19 struct clock_board {
20 void __iomem *clock_freq_regs;
21 void __iomem *clock_regs;
22 void __iomem *clock_ver_reg;
23 int num_slots;
24 struct resource leds_resource;
25 struct platform_device leds_pdev;
26 };
27
28 struct fhc {
29 void __iomem *pregs;
30 bool central;
31 bool jtag_master;
32 int board_num;
33 struct resource leds_resource;
34 struct platform_device leds_pdev;
35 };
36
clock_board_calc_nslots(struct clock_board * p)37 static int clock_board_calc_nslots(struct clock_board *p)
38 {
39 u8 reg = upa_readb(p->clock_regs + CLOCK_STAT1) & 0xc0;
40
41 switch (reg) {
42 case 0x40:
43 return 16;
44
45 case 0xc0:
46 return 8;
47
48 case 0x80:
49 reg = 0;
50 if (p->clock_ver_reg)
51 reg = upa_readb(p->clock_ver_reg);
52 if (reg) {
53 if (reg & 0x80)
54 return 4;
55 else
56 return 5;
57 }
58 fallthrough;
59 default:
60 return 4;
61 }
62 }
63
clock_board_probe(struct platform_device * op)64 static int clock_board_probe(struct platform_device *op)
65 {
66 struct clock_board *p = kzalloc(sizeof(*p), GFP_KERNEL);
67 int err = -ENOMEM;
68
69 if (!p) {
70 printk(KERN_ERR "clock_board: Cannot allocate struct clock_board\n");
71 goto out;
72 }
73
74 p->clock_freq_regs = of_ioremap(&op->resource[0], 0,
75 resource_size(&op->resource[0]),
76 "clock_board_freq");
77 if (!p->clock_freq_regs) {
78 printk(KERN_ERR "clock_board: Cannot map clock_freq_regs\n");
79 goto out_free;
80 }
81
82 p->clock_regs = of_ioremap(&op->resource[1], 0,
83 resource_size(&op->resource[1]),
84 "clock_board_regs");
85 if (!p->clock_regs) {
86 printk(KERN_ERR "clock_board: Cannot map clock_regs\n");
87 goto out_unmap_clock_freq_regs;
88 }
89
90 if (op->resource[2].flags) {
91 p->clock_ver_reg = of_ioremap(&op->resource[2], 0,
92 resource_size(&op->resource[2]),
93 "clock_ver_reg");
94 if (!p->clock_ver_reg) {
95 printk(KERN_ERR "clock_board: Cannot map clock_ver_reg\n");
96 goto out_unmap_clock_regs;
97 }
98 }
99
100 p->num_slots = clock_board_calc_nslots(p);
101
102 p->leds_resource.start = (unsigned long)
103 (p->clock_regs + CLOCK_CTRL);
104 p->leds_resource.end = p->leds_resource.start;
105 p->leds_resource.name = "leds";
106
107 p->leds_pdev.name = "sunfire-clockboard-leds";
108 p->leds_pdev.id = -1;
109 p->leds_pdev.resource = &p->leds_resource;
110 p->leds_pdev.num_resources = 1;
111 p->leds_pdev.dev.parent = &op->dev;
112
113 err = platform_device_register(&p->leds_pdev);
114 if (err) {
115 printk(KERN_ERR "clock_board: Could not register LEDS "
116 "platform device\n");
117 goto out_unmap_clock_ver_reg;
118 }
119
120 printk(KERN_INFO "clock_board: Detected %d slot Enterprise system.\n",
121 p->num_slots);
122
123 err = 0;
124 out:
125 return err;
126
127 out_unmap_clock_ver_reg:
128 if (p->clock_ver_reg)
129 of_iounmap(&op->resource[2], p->clock_ver_reg,
130 resource_size(&op->resource[2]));
131
132 out_unmap_clock_regs:
133 of_iounmap(&op->resource[1], p->clock_regs,
134 resource_size(&op->resource[1]));
135
136 out_unmap_clock_freq_regs:
137 of_iounmap(&op->resource[0], p->clock_freq_regs,
138 resource_size(&op->resource[0]));
139
140 out_free:
141 kfree(p);
142 goto out;
143 }
144
145 static const struct of_device_id clock_board_match[] = {
146 {
147 .name = "clock-board",
148 },
149 {},
150 };
151
152 static struct platform_driver clock_board_driver = {
153 .probe = clock_board_probe,
154 .driver = {
155 .name = "clock_board",
156 .of_match_table = clock_board_match,
157 },
158 };
159
fhc_probe(struct platform_device * op)160 static int 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 (of_node_name_eq(op->dev.of_node->parent, "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
238 out:
239 return err;
240
241 out_unmap_pregs:
242 of_iounmap(&op->resource[0], p->pregs, resource_size(&op->resource[0]));
243
244 out_free:
245 kfree(p);
246 goto out;
247 }
248
249 static const struct of_device_id fhc_match[] = {
250 {
251 .name = "fhc",
252 },
253 {},
254 };
255
256 static struct platform_driver fhc_driver = {
257 .probe = fhc_probe,
258 .driver = {
259 .name = "fhc",
260 .of_match_table = fhc_match,
261 },
262 };
263
sunfire_init(void)264 static int __init sunfire_init(void)
265 {
266 (void) platform_driver_register(&fhc_driver);
267 (void) platform_driver_register(&clock_board_driver);
268 return 0;
269 }
270
271 fs_initcall(sunfire_init);
272