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1/*
2 * linux/arch/unicore32/kernel/clock.c
3 *
4 * Code specific to PKUnity SoC and UniCore ISA
5 *
6 * Maintained by GUAN Xue-tao <gxt@mprc.pku.edu.cn>
7 * Copyright (C) 2001-2010 Guan Xuetao
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
12 */
13#include <linux/module.h>
14#include <linux/kernel.h>
15#include <linux/device.h>
16#include <linux/list.h>
17#include <linux/errno.h>
18#include <linux/err.h>
19#include <linux/string.h>
20#include <linux/clk.h>
21#include <linux/mutex.h>
22#include <linux/delay.h>
23#include <linux/io.h>
24
25#include <mach/hardware.h>
26
27/*
28 * Very simple clock implementation
29 */
30struct clk {
31 struct list_head node;
32 unsigned long rate;
33 const char *name;
34};
35
36static struct clk clk_ost_clk = {
37 .name = "OST_CLK",
38 .rate = CLOCK_TICK_RATE,
39};
40
41static struct clk clk_mclk_clk = {
42 .name = "MAIN_CLK",
43};
44
45static struct clk clk_bclk32_clk = {
46 .name = "BUS32_CLK",
47};
48
49static struct clk clk_ddr_clk = {
50 .name = "DDR_CLK",
51};
52
53static struct clk clk_vga_clk = {
54 .name = "VGA_CLK",
55};
56
57static LIST_HEAD(clocks);
58static DEFINE_MUTEX(clocks_mutex);
59
60struct clk *clk_get(struct device *dev, const char *id)
61{
62 struct clk *p, *clk = ERR_PTR(-ENOENT);
63
64 mutex_lock(&clocks_mutex);
65 list_for_each_entry(p, &clocks, node) {
66 if (strcmp(id, p->name) == 0) {
67 clk = p;
68 break;
69 }
70 }
71 mutex_unlock(&clocks_mutex);
72
73 return clk;
74}
75EXPORT_SYMBOL(clk_get);
76
77void clk_put(struct clk *clk)
78{
79}
80EXPORT_SYMBOL(clk_put);
81
82int clk_enable(struct clk *clk)
83{
84 return 0;
85}
86EXPORT_SYMBOL(clk_enable);
87
88void clk_disable(struct clk *clk)
89{
90}
91EXPORT_SYMBOL(clk_disable);
92
93unsigned long clk_get_rate(struct clk *clk)
94{
95 return clk->rate;
96}
97EXPORT_SYMBOL(clk_get_rate);
98
99struct {
100 unsigned long rate;
101 unsigned long cfg;
102 unsigned long div;
103} vga_clk_table[] = {
104 {.rate = 25175000, .cfg = 0x00002001, .div = 0x9},
105 {.rate = 31500000, .cfg = 0x00002001, .div = 0x7},
106 {.rate = 40000000, .cfg = 0x00003801, .div = 0x9},
107 {.rate = 49500000, .cfg = 0x00003801, .div = 0x7},
108 {.rate = 65000000, .cfg = 0x00002c01, .div = 0x4},
109 {.rate = 78750000, .cfg = 0x00002400, .div = 0x7},
110 {.rate = 108000000, .cfg = 0x00002c01, .div = 0x2},
111 {.rate = 106500000, .cfg = 0x00003c01, .div = 0x3},
112 {.rate = 50650000, .cfg = 0x00106400, .div = 0x9},
113 {.rate = 61500000, .cfg = 0x00106400, .div = 0xa},
114 {.rate = 85500000, .cfg = 0x00002800, .div = 0x6},
115};
116
117struct {
118 unsigned long mrate;
119 unsigned long prate;
120} mclk_clk_table[] = {
121 {.mrate = 500000000, .prate = 0x00109801},
122 {.mrate = 525000000, .prate = 0x00104C00},
123 {.mrate = 550000000, .prate = 0x00105000},
124 {.mrate = 575000000, .prate = 0x00105400},
125 {.mrate = 600000000, .prate = 0x00105800},
126 {.mrate = 625000000, .prate = 0x00105C00},
127 {.mrate = 650000000, .prate = 0x00106000},
128 {.mrate = 675000000, .prate = 0x00106400},
129 {.mrate = 700000000, .prate = 0x00106800},
130 {.mrate = 725000000, .prate = 0x00106C00},
131 {.mrate = 750000000, .prate = 0x00107000},
132 {.mrate = 775000000, .prate = 0x00107400},
133 {.mrate = 800000000, .prate = 0x00107800},
134};
135
136int clk_set_rate(struct clk *clk, unsigned long rate)
137{
138 if (clk == &clk_vga_clk) {
139 unsigned long pll_vgacfg, pll_vgadiv;
140 int ret, i;
141
142 /* lookup vga_clk_table */
143 ret = -EINVAL;
144 for (i = 0; i < ARRAY_SIZE(vga_clk_table); i++) {
145 if (rate == vga_clk_table[i].rate) {
146 pll_vgacfg = vga_clk_table[i].cfg;
147 pll_vgadiv = vga_clk_table[i].div;
148 ret = 0;
149 break;
150 }
151 }
152
153 if (ret)
154 return ret;
155
156 if (readl(PM_PLLVGACFG) == pll_vgacfg)
157 return 0;
158
159 /* set pll vga cfg reg. */
160 writel(pll_vgacfg, PM_PLLVGACFG);
161
162 writel(PM_PMCR_CFBVGA, PM_PMCR);
163 while ((readl(PM_PLLDFCDONE) & PM_PLLDFCDONE_VGADFC)
164 != PM_PLLDFCDONE_VGADFC)
165 udelay(100); /* about 1ms */
166
167 /* set div cfg reg. */
168 writel(readl(PM_PCGR) | PM_PCGR_VGACLK, PM_PCGR);
169
170 writel((readl(PM_DIVCFG) & ~PM_DIVCFG_VGACLK_MASK)
171 | PM_DIVCFG_VGACLK(pll_vgadiv), PM_DIVCFG);
172
173 writel(readl(PM_SWRESET) | PM_SWRESET_VGADIV, PM_SWRESET);
174 while ((readl(PM_SWRESET) & PM_SWRESET_VGADIV)
175 == PM_SWRESET_VGADIV)
176 udelay(100); /* 65536 bclk32, about 320us */
177
178 writel(readl(PM_PCGR) & ~PM_PCGR_VGACLK, PM_PCGR);
179 }
180#ifdef CONFIG_CPU_FREQ
181 if (clk == &clk_mclk_clk) {
182 u32 pll_rate, divstatus = PM_DIVSTATUS;
183 int ret, i;
184
185 /* lookup mclk_clk_table */
186 ret = -EINVAL;
187 for (i = 0; i < ARRAY_SIZE(mclk_clk_table); i++) {
188 if (rate == mclk_clk_table[i].mrate) {
189 pll_rate = mclk_clk_table[i].prate;
190 clk_mclk_clk.rate = mclk_clk_table[i].mrate;
191 ret = 0;
192 break;
193 }
194 }
195
196 if (ret)
197 return ret;
198
199 if (clk_mclk_clk.rate)
200 clk_bclk32_clk.rate = clk_mclk_clk.rate
201 / (((divstatus & 0x0000f000) >> 12) + 1);
202
203 /* set pll sys cfg reg. */
204 PM_PLLSYSCFG = pll_rate;
205
206 PM_PMCR = PM_PMCR_CFBSYS;
207 while ((PM_PLLDFCDONE & PM_PLLDFCDONE_SYSDFC)
208 != PM_PLLDFCDONE_SYSDFC)
209 udelay(100);
210 /* about 1ms */
211 }
212#endif
213 return 0;
214}
215EXPORT_SYMBOL(clk_set_rate);
216
217int clk_register(struct clk *clk)
218{
219 mutex_lock(&clocks_mutex);
220 list_add(&clk->node, &clocks);
221 mutex_unlock(&clocks_mutex);
222 printk(KERN_DEFAULT "PKUnity PM: %s %lu.%02luM\n", clk->name,
223 (clk->rate)/1000000, (clk->rate)/10000 % 100);
224 return 0;
225}
226EXPORT_SYMBOL(clk_register);
227
228void clk_unregister(struct clk *clk)
229{
230 mutex_lock(&clocks_mutex);
231 list_del(&clk->node);
232 mutex_unlock(&clocks_mutex);
233}
234EXPORT_SYMBOL(clk_unregister);
235
236struct {
237 unsigned long prate;
238 unsigned long rate;
239} pllrate_table[] = {
240 {.prate = 0x00002001, .rate = 250000000},
241 {.prate = 0x00104801, .rate = 250000000},
242 {.prate = 0x00104C01, .rate = 262500000},
243 {.prate = 0x00002401, .rate = 275000000},
244 {.prate = 0x00105001, .rate = 275000000},
245 {.prate = 0x00105401, .rate = 287500000},
246 {.prate = 0x00002801, .rate = 300000000},
247 {.prate = 0x00105801, .rate = 300000000},
248 {.prate = 0x00105C01, .rate = 312500000},
249 {.prate = 0x00002C01, .rate = 325000000},
250 {.prate = 0x00106001, .rate = 325000000},
251 {.prate = 0x00106401, .rate = 337500000},
252 {.prate = 0x00003001, .rate = 350000000},
253 {.prate = 0x00106801, .rate = 350000000},
254 {.prate = 0x00106C01, .rate = 362500000},
255 {.prate = 0x00003401, .rate = 375000000},
256 {.prate = 0x00107001, .rate = 375000000},
257 {.prate = 0x00107401, .rate = 387500000},
258 {.prate = 0x00003801, .rate = 400000000},
259 {.prate = 0x00107801, .rate = 400000000},
260 {.prate = 0x00107C01, .rate = 412500000},
261 {.prate = 0x00003C01, .rate = 425000000},
262 {.prate = 0x00108001, .rate = 425000000},
263 {.prate = 0x00108401, .rate = 437500000},
264 {.prate = 0x00004001, .rate = 450000000},
265 {.prate = 0x00108801, .rate = 450000000},
266 {.prate = 0x00108C01, .rate = 462500000},
267 {.prate = 0x00004401, .rate = 475000000},
268 {.prate = 0x00109001, .rate = 475000000},
269 {.prate = 0x00109401, .rate = 487500000},
270 {.prate = 0x00004801, .rate = 500000000},
271 {.prate = 0x00109801, .rate = 500000000},
272 {.prate = 0x00104C00, .rate = 525000000},
273 {.prate = 0x00002400, .rate = 550000000},
274 {.prate = 0x00105000, .rate = 550000000},
275 {.prate = 0x00105400, .rate = 575000000},
276 {.prate = 0x00002800, .rate = 600000000},
277 {.prate = 0x00105800, .rate = 600000000},
278 {.prate = 0x00105C00, .rate = 625000000},
279 {.prate = 0x00002C00, .rate = 650000000},
280 {.prate = 0x00106000, .rate = 650000000},
281 {.prate = 0x00106400, .rate = 675000000},
282 {.prate = 0x00003000, .rate = 700000000},
283 {.prate = 0x00106800, .rate = 700000000},
284 {.prate = 0x00106C00, .rate = 725000000},
285 {.prate = 0x00003400, .rate = 750000000},
286 {.prate = 0x00107000, .rate = 750000000},
287 {.prate = 0x00107400, .rate = 775000000},
288 {.prate = 0x00003800, .rate = 800000000},
289 {.prate = 0x00107800, .rate = 800000000},
290 {.prate = 0x00107C00, .rate = 825000000},
291 {.prate = 0x00003C00, .rate = 850000000},
292 {.prate = 0x00108000, .rate = 850000000},
293 {.prate = 0x00108400, .rate = 875000000},
294 {.prate = 0x00004000, .rate = 900000000},
295 {.prate = 0x00108800, .rate = 900000000},
296 {.prate = 0x00108C00, .rate = 925000000},
297 {.prate = 0x00004400, .rate = 950000000},
298 {.prate = 0x00109000, .rate = 950000000},
299 {.prate = 0x00109400, .rate = 975000000},
300 {.prate = 0x00004800, .rate = 1000000000},
301 {.prate = 0x00109800, .rate = 1000000000},
302};
303
304struct {
305 unsigned long prate;
306 unsigned long drate;
307} pddr_table[] = {
308 {.prate = 0x00100800, .drate = 44236800},
309 {.prate = 0x00100C00, .drate = 66355200},
310 {.prate = 0x00101000, .drate = 88473600},
311 {.prate = 0x00101400, .drate = 110592000},
312 {.prate = 0x00101800, .drate = 132710400},
313 {.prate = 0x00101C01, .drate = 154828800},
314 {.prate = 0x00102001, .drate = 176947200},
315 {.prate = 0x00102401, .drate = 199065600},
316 {.prate = 0x00102801, .drate = 221184000},
317 {.prate = 0x00102C01, .drate = 243302400},
318 {.prate = 0x00103001, .drate = 265420800},
319 {.prate = 0x00103401, .drate = 287539200},
320 {.prate = 0x00103801, .drate = 309657600},
321 {.prate = 0x00103C01, .drate = 331776000},
322 {.prate = 0x00104001, .drate = 353894400},
323};
324
325static int __init clk_init(void)
326{
327#ifdef CONFIG_PUV3_PM
328 u32 pllrate, divstatus = readl(PM_DIVSTATUS);
329 u32 pcgr_val = readl(PM_PCGR);
330 int i;
331
332 pcgr_val |= PM_PCGR_BCLKMME | PM_PCGR_BCLKH264E | PM_PCGR_BCLKH264D
333 | PM_PCGR_HECLK | PM_PCGR_HDCLK;
334 writel(pcgr_val, PM_PCGR);
335
336 pllrate = readl(PM_PLLSYSSTATUS);
337
338 /* lookup pmclk_table */
339 clk_mclk_clk.rate = 0;
340 for (i = 0; i < ARRAY_SIZE(pllrate_table); i++) {
341 if (pllrate == pllrate_table[i].prate) {
342 clk_mclk_clk.rate = pllrate_table[i].rate;
343 break;
344 }
345 }
346
347 if (clk_mclk_clk.rate)
348 clk_bclk32_clk.rate = clk_mclk_clk.rate /
349 (((divstatus & 0x0000f000) >> 12) + 1);
350
351 pllrate = readl(PM_PLLDDRSTATUS);
352
353 /* lookup pddr_table */
354 clk_ddr_clk.rate = 0;
355 for (i = 0; i < ARRAY_SIZE(pddr_table); i++) {
356 if (pllrate == pddr_table[i].prate) {
357 clk_ddr_clk.rate = pddr_table[i].drate;
358 break;
359 }
360 }
361
362 pllrate = readl(PM_PLLVGASTATUS);
363
364 /* lookup pvga_table */
365 clk_vga_clk.rate = 0;
366 for (i = 0; i < ARRAY_SIZE(pllrate_table); i++) {
367 if (pllrate == pllrate_table[i].prate) {
368 clk_vga_clk.rate = pllrate_table[i].rate;
369 break;
370 }
371 }
372
373 if (clk_vga_clk.rate)
374 clk_vga_clk.rate = clk_vga_clk.rate /
375 (((divstatus & 0x00f00000) >> 20) + 1);
376
377 clk_register(&clk_vga_clk);
378#endif
379#ifdef CONFIG_ARCH_FPGA
380 clk_ddr_clk.rate = 33000000;
381 clk_mclk_clk.rate = 33000000;
382 clk_bclk32_clk.rate = 33000000;
383#endif
384 clk_register(&clk_ddr_clk);
385 clk_register(&clk_mclk_clk);
386 clk_register(&clk_bclk32_clk);
387 clk_register(&clk_ost_clk);
388 return 0;
389}
390core_initcall(clk_init);