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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
d979f179 | 2 | /* central.c: Central FHC driver for Sunfire/Starfire/Wildfire. |
1da177e4 | 3 | * |
b69416b5 | 4 | * Copyright (C) 1997, 1999, 2008 David S. Miller (davem@davemloft.net) |
1da177e4 LT |
5 | */ |
6 | ||
7 | #include <linux/kernel.h> | |
8 | #include <linux/types.h> | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
7b64db60 | 10 | #include <linux/export.h> |
1da177e4 | 11 | #include <linux/string.h> |
1da177e4 | 12 | #include <linux/init.h> |
b69416b5 DM |
13 | #include <linux/of_device.h> |
14 | #include <linux/platform_device.h> | |
1da177e4 | 15 | |
1da177e4 | 16 | #include <asm/fhc.h> |
b69416b5 DM |
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 | ||
7c9503b8 | 37 | static int clock_board_calc_nslots(struct clock_board *p) |
b69416b5 DM |
38 | { |
39 | u8 reg = upa_readb(p->clock_regs + CLOCK_STAT1) & 0xc0; | |
1da177e4 | 40 | |
b69416b5 DM |
41 | switch (reg) { |
42 | case 0x40: | |
43 | return 16; | |
1da177e4 | 44 | |
b69416b5 DM |
45 | case 0xc0: |
46 | return 8; | |
1da177e4 | 47 | |
b69416b5 DM |
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; | |
cecc4e92 | 61 | } |
1da177e4 LT |
62 | } |
63 | ||
7c9503b8 | 64 | static int clock_board_probe(struct platform_device *op) |
1da177e4 | 65 | { |
b69416b5 DM |
66 | struct clock_board *p = kzalloc(sizeof(*p), GFP_KERNEL); |
67 | int err = -ENOMEM; | |
1da177e4 | 68 | |
b69416b5 DM |
69 | if (!p) { |
70 | printk(KERN_ERR "clock_board: Cannot allocate struct clock_board\n"); | |
71 | goto out; | |
1da177e4 | 72 | } |
1da177e4 | 73 | |
b69416b5 DM |
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 | } | |
1da177e4 | 81 | |
b69416b5 DM |
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 | } | |
1da177e4 | 89 | |
b69416b5 DM |
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 | } | |
1da177e4 | 99 | |
b69416b5 | 100 | p->num_slots = clock_board_calc_nslots(p); |
1da177e4 | 101 | |
b69416b5 DM |
102 | p->leds_resource.start = (unsigned long) |
103 | (p->clock_regs + CLOCK_CTRL); | |
09317146 | 104 | p->leds_resource.end = p->leds_resource.start; |
b69416b5 | 105 | p->leds_resource.name = "leds"; |
1da177e4 | 106 | |
b69416b5 | 107 | p->leds_pdev.name = "sunfire-clockboard-leds"; |
b7c18c1b | 108 | p->leds_pdev.id = -1; |
b69416b5 DM |
109 | p->leds_pdev.resource = &p->leds_resource; |
110 | p->leds_pdev.num_resources = 1; | |
111 | p->leds_pdev.dev.parent = &op->dev; | |
1da177e4 | 112 | |
b69416b5 DM |
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; | |
1da177e4 | 118 | } |
1da177e4 | 119 | |
b69416b5 DM |
120 | printk(KERN_INFO "clock_board: Detected %d slot Enterprise system.\n", |
121 | p->num_slots); | |
1da177e4 | 122 | |
b69416b5 DM |
123 | err = 0; |
124 | out: | |
125 | return err; | |
1da177e4 | 126 | |
b69416b5 DM |
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])); | |
cecc4e92 | 131 | |
b69416b5 DM |
132 | out_unmap_clock_regs: |
133 | of_iounmap(&op->resource[1], p->clock_regs, | |
134 | resource_size(&op->resource[1])); | |
1da177e4 | 135 | |
b69416b5 DM |
136 | out_unmap_clock_freq_regs: |
137 | of_iounmap(&op->resource[0], p->clock_freq_regs, | |
138 | resource_size(&op->resource[0])); | |
1da177e4 | 139 | |
b69416b5 DM |
140 | out_free: |
141 | kfree(p); | |
142 | goto out; | |
1da177e4 LT |
143 | } |
144 | ||
3628aa06 | 145 | static const struct of_device_id clock_board_match[] = { |
b69416b5 DM |
146 | { |
147 | .name = "clock-board", | |
148 | }, | |
149 | {}, | |
150 | }; | |
151 | ||
4ebb24f7 | 152 | static struct platform_driver clock_board_driver = { |
b69416b5 | 153 | .probe = clock_board_probe, |
4018294b GL |
154 | .driver = { |
155 | .name = "clock_board", | |
4018294b | 156 | .of_match_table = clock_board_match, |
b69416b5 DM |
157 | }, |
158 | }; | |
159 | ||
7c9503b8 | 160 | static int fhc_probe(struct platform_device *op) |
1da177e4 | 161 | { |
b69416b5 DM |
162 | struct fhc *p = kzalloc(sizeof(*p), GFP_KERNEL); |
163 | int err = -ENOMEM; | |
164 | u32 reg; | |
1da177e4 | 165 | |
b69416b5 DM |
166 | if (!p) { |
167 | printk(KERN_ERR "fhc: Cannot allocate struct fhc\n"); | |
168 | goto out; | |
1da177e4 LT |
169 | } |
170 | ||
61c7a080 | 171 | if (!strcmp(op->dev.of_node->parent->name, "central")) |
b69416b5 | 172 | p->central = true; |
1da177e4 | 173 | |
b69416b5 DM |
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; | |
cecc4e92 | 180 | } |
1da177e4 | 181 | |
b69416b5 DM |
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 { | |
61c7a080 | 186 | p->board_num = of_getintprop_default(op->dev.of_node, "board#", -1); |
b69416b5 DM |
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 | } | |
1da177e4 | 194 | |
b69416b5 DM |
195 | if (!p->central) { |
196 | p->leds_resource.start = (unsigned long) | |
197 | (p->pregs + FHC_PREGS_CTRL); | |
09317146 | 198 | p->leds_resource.end = p->leds_resource.start; |
b69416b5 DM |
199 | p->leds_resource.name = "leds"; |
200 | ||
201 | p->leds_pdev.name = "sunfire-fhc-leds"; | |
b7c18c1b | 202 | p->leds_pdev.id = p->board_num; |
b69416b5 DM |
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); | |
1da177e4 | 215 | |
b69416b5 DM |
216 | if (!p->central) |
217 | reg |= FHC_CONTROL_IXIST; | |
1da177e4 | 218 | |
b69416b5 DM |
219 | reg &= ~(FHC_CONTROL_AOFF | |
220 | FHC_CONTROL_BOFF | | |
221 | FHC_CONTROL_SLINE); | |
1da177e4 | 222 | |
b69416b5 DM |
223 | upa_writel(reg, p->pregs + FHC_PREGS_CTRL); |
224 | upa_readl(p->pregs + FHC_PREGS_CTRL); | |
1da177e4 | 225 | |
b69416b5 DM |
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)" : ""))); | |
1da177e4 | 235 | |
b69416b5 | 236 | err = 0; |
1da177e4 | 237 | |
b69416b5 DM |
238 | out: |
239 | return err; | |
1da177e4 | 240 | |
b69416b5 DM |
241 | out_unmap_pregs: |
242 | of_iounmap(&op->resource[0], p->pregs, resource_size(&op->resource[0])); | |
1da177e4 | 243 | |
b69416b5 DM |
244 | out_free: |
245 | kfree(p); | |
246 | goto out; | |
1da177e4 LT |
247 | } |
248 | ||
3628aa06 | 249 | static const struct of_device_id fhc_match[] = { |
b69416b5 DM |
250 | { |
251 | .name = "fhc", | |
252 | }, | |
253 | {}, | |
254 | }; | |
255 | ||
4ebb24f7 | 256 | static struct platform_driver fhc_driver = { |
b69416b5 | 257 | .probe = fhc_probe, |
4018294b GL |
258 | .driver = { |
259 | .name = "fhc", | |
4018294b | 260 | .of_match_table = fhc_match, |
b69416b5 DM |
261 | }, |
262 | }; | |
263 | ||
264 | static int __init sunfire_init(void) | |
1da177e4 | 265 | { |
4ebb24f7 GL |
266 | (void) platform_driver_register(&fhc_driver); |
267 | (void) platform_driver_register(&clock_board_driver); | |
b69416b5 | 268 | return 0; |
1da177e4 | 269 | } |
b69416b5 | 270 | |
a5a737e0 | 271 | fs_initcall(sunfire_init); |