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1// SPDX-License-Identifier: GPL-2.0-only
2/* us2e_cpufreq.c: UltraSPARC-IIe cpu frequency support
3 *
4 * Copyright (C) 2003 David S. Miller (davem@redhat.com)
5 *
6 * Many thanks to Dominik Brodowski for fixing up the cpufreq
7 * infrastructure in order to make this driver easier to implement.
8 */
9
10#include <linux/kernel.h>
11#include <linux/module.h>
12#include <linux/sched.h>
13#include <linux/smp.h>
14#include <linux/cpufreq.h>
15#include <linux/threads.h>
16#include <linux/slab.h>
17#include <linux/delay.h>
18#include <linux/init.h>
19
20#include <asm/asi.h>
21#include <asm/timer.h>
22
23static struct cpufreq_driver *cpufreq_us2e_driver;
24
25struct us2e_freq_percpu_info {
26 struct cpufreq_frequency_table table[6];
27};
28
29/* Indexed by cpu number. */
30static struct us2e_freq_percpu_info *us2e_freq_table;
31
32#define HBIRD_MEM_CNTL0_ADDR 0x1fe0000f010UL
33#define HBIRD_ESTAR_MODE_ADDR 0x1fe0000f080UL
34
35/* UltraSPARC-IIe has five dividers: 1, 2, 4, 6, and 8. These are controlled
36 * in the ESTAR mode control register.
37 */
38#define ESTAR_MODE_DIV_1 0x0000000000000000UL
39#define ESTAR_MODE_DIV_2 0x0000000000000001UL
40#define ESTAR_MODE_DIV_4 0x0000000000000003UL
41#define ESTAR_MODE_DIV_6 0x0000000000000002UL
42#define ESTAR_MODE_DIV_8 0x0000000000000004UL
43#define ESTAR_MODE_DIV_MASK 0x0000000000000007UL
44
45#define MCTRL0_SREFRESH_ENAB 0x0000000000010000UL
46#define MCTRL0_REFR_COUNT_MASK 0x0000000000007f00UL
47#define MCTRL0_REFR_COUNT_SHIFT 8
48#define MCTRL0_REFR_INTERVAL 7800
49#define MCTRL0_REFR_CLKS_P_CNT 64
50
51static unsigned long read_hbreg(unsigned long addr)
52{
53 unsigned long ret;
54
55 __asm__ __volatile__("ldxa [%1] %2, %0"
56 : "=&r" (ret)
57 : "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E));
58 return ret;
59}
60
61static void write_hbreg(unsigned long addr, unsigned long val)
62{
63 __asm__ __volatile__("stxa %0, [%1] %2\n\t"
64 "membar #Sync"
65 : /* no outputs */
66 : "r" (val), "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E)
67 : "memory");
68 if (addr == HBIRD_ESTAR_MODE_ADDR) {
69 /* Need to wait 16 clock cycles for the PLL to lock. */
70 udelay(1);
71 }
72}
73
74static void self_refresh_ctl(int enable)
75{
76 unsigned long mctrl = read_hbreg(HBIRD_MEM_CNTL0_ADDR);
77
78 if (enable)
79 mctrl |= MCTRL0_SREFRESH_ENAB;
80 else
81 mctrl &= ~MCTRL0_SREFRESH_ENAB;
82 write_hbreg(HBIRD_MEM_CNTL0_ADDR, mctrl);
83 (void) read_hbreg(HBIRD_MEM_CNTL0_ADDR);
84}
85
86static void frob_mem_refresh(int cpu_slowing_down,
87 unsigned long clock_tick,
88 unsigned long old_divisor, unsigned long divisor)
89{
90 unsigned long old_refr_count, refr_count, mctrl;
91
92 refr_count = (clock_tick * MCTRL0_REFR_INTERVAL);
93 refr_count /= (MCTRL0_REFR_CLKS_P_CNT * divisor * 1000000000UL);
94
95 mctrl = read_hbreg(HBIRD_MEM_CNTL0_ADDR);
96 old_refr_count = (mctrl & MCTRL0_REFR_COUNT_MASK)
97 >> MCTRL0_REFR_COUNT_SHIFT;
98
99 mctrl &= ~MCTRL0_REFR_COUNT_MASK;
100 mctrl |= refr_count << MCTRL0_REFR_COUNT_SHIFT;
101 write_hbreg(HBIRD_MEM_CNTL0_ADDR, mctrl);
102 mctrl = read_hbreg(HBIRD_MEM_CNTL0_ADDR);
103
104 if (cpu_slowing_down && !(mctrl & MCTRL0_SREFRESH_ENAB)) {
105 unsigned long usecs;
106
107 /* We have to wait for both refresh counts (old
108 * and new) to go to zero.
109 */
110 usecs = (MCTRL0_REFR_CLKS_P_CNT *
111 (refr_count + old_refr_count) *
112 1000000UL *
113 old_divisor) / clock_tick;
114 udelay(usecs + 1UL);
115 }
116}
117
118static void us2e_transition(unsigned long estar, unsigned long new_bits,
119 unsigned long clock_tick,
120 unsigned long old_divisor, unsigned long divisor)
121{
122 estar &= ~ESTAR_MODE_DIV_MASK;
123
124 /* This is based upon the state transition diagram in the IIe manual. */
125 if (old_divisor == 2 && divisor == 1) {
126 self_refresh_ctl(0);
127 write_hbreg(HBIRD_ESTAR_MODE_ADDR, estar | new_bits);
128 frob_mem_refresh(0, clock_tick, old_divisor, divisor);
129 } else if (old_divisor == 1 && divisor == 2) {
130 frob_mem_refresh(1, clock_tick, old_divisor, divisor);
131 write_hbreg(HBIRD_ESTAR_MODE_ADDR, estar | new_bits);
132 self_refresh_ctl(1);
133 } else if (old_divisor == 1 && divisor > 2) {
134 us2e_transition(estar, ESTAR_MODE_DIV_2, clock_tick,
135 1, 2);
136 us2e_transition(estar, new_bits, clock_tick,
137 2, divisor);
138 } else if (old_divisor > 2 && divisor == 1) {
139 us2e_transition(estar, ESTAR_MODE_DIV_2, clock_tick,
140 old_divisor, 2);
141 us2e_transition(estar, new_bits, clock_tick,
142 2, divisor);
143 } else if (old_divisor < divisor) {
144 frob_mem_refresh(0, clock_tick, old_divisor, divisor);
145 write_hbreg(HBIRD_ESTAR_MODE_ADDR, estar | new_bits);
146 } else if (old_divisor > divisor) {
147 write_hbreg(HBIRD_ESTAR_MODE_ADDR, estar | new_bits);
148 frob_mem_refresh(1, clock_tick, old_divisor, divisor);
149 } else {
150 BUG();
151 }
152}
153
154static unsigned long index_to_estar_mode(unsigned int index)
155{
156 switch (index) {
157 case 0:
158 return ESTAR_MODE_DIV_1;
159
160 case 1:
161 return ESTAR_MODE_DIV_2;
162
163 case 2:
164 return ESTAR_MODE_DIV_4;
165
166 case 3:
167 return ESTAR_MODE_DIV_6;
168
169 case 4:
170 return ESTAR_MODE_DIV_8;
171
172 default:
173 BUG();
174 }
175}
176
177static unsigned long index_to_divisor(unsigned int index)
178{
179 switch (index) {
180 case 0:
181 return 1;
182
183 case 1:
184 return 2;
185
186 case 2:
187 return 4;
188
189 case 3:
190 return 6;
191
192 case 4:
193 return 8;
194
195 default:
196 BUG();
197 }
198}
199
200static unsigned long estar_to_divisor(unsigned long estar)
201{
202 unsigned long ret;
203
204 switch (estar & ESTAR_MODE_DIV_MASK) {
205 case ESTAR_MODE_DIV_1:
206 ret = 1;
207 break;
208 case ESTAR_MODE_DIV_2:
209 ret = 2;
210 break;
211 case ESTAR_MODE_DIV_4:
212 ret = 4;
213 break;
214 case ESTAR_MODE_DIV_6:
215 ret = 6;
216 break;
217 case ESTAR_MODE_DIV_8:
218 ret = 8;
219 break;
220 default:
221 BUG();
222 }
223
224 return ret;
225}
226
227static void __us2e_freq_get(void *arg)
228{
229 unsigned long *estar = arg;
230
231 *estar = read_hbreg(HBIRD_ESTAR_MODE_ADDR);
232}
233
234static unsigned int us2e_freq_get(unsigned int cpu)
235{
236 unsigned long clock_tick, estar;
237
238 clock_tick = sparc64_get_clock_tick(cpu) / 1000;
239 if (smp_call_function_single(cpu, __us2e_freq_get, &estar, 1))
240 return 0;
241
242 return clock_tick / estar_to_divisor(estar);
243}
244
245static void __us2e_freq_target(void *arg)
246{
247 unsigned int cpu = smp_processor_id();
248 unsigned int *index = arg;
249 unsigned long new_bits, new_freq;
250 unsigned long clock_tick, divisor, old_divisor, estar;
251
252 new_freq = clock_tick = sparc64_get_clock_tick(cpu) / 1000;
253 new_bits = index_to_estar_mode(*index);
254 divisor = index_to_divisor(*index);
255 new_freq /= divisor;
256
257 estar = read_hbreg(HBIRD_ESTAR_MODE_ADDR);
258
259 old_divisor = estar_to_divisor(estar);
260
261 if (old_divisor != divisor) {
262 us2e_transition(estar, new_bits, clock_tick * 1000,
263 old_divisor, divisor);
264 }
265}
266
267static int us2e_freq_target(struct cpufreq_policy *policy, unsigned int index)
268{
269 unsigned int cpu = policy->cpu;
270
271 return smp_call_function_single(cpu, __us2e_freq_target, &index, 1);
272}
273
274static int __init us2e_freq_cpu_init(struct cpufreq_policy *policy)
275{
276 unsigned int cpu = policy->cpu;
277 unsigned long clock_tick = sparc64_get_clock_tick(cpu) / 1000;
278 struct cpufreq_frequency_table *table =
279 &us2e_freq_table[cpu].table[0];
280
281 table[0].driver_data = 0;
282 table[0].frequency = clock_tick / 1;
283 table[1].driver_data = 1;
284 table[1].frequency = clock_tick / 2;
285 table[2].driver_data = 2;
286 table[2].frequency = clock_tick / 4;
287 table[2].driver_data = 3;
288 table[2].frequency = clock_tick / 6;
289 table[2].driver_data = 4;
290 table[2].frequency = clock_tick / 8;
291 table[2].driver_data = 5;
292 table[3].frequency = CPUFREQ_TABLE_END;
293
294 policy->cpuinfo.transition_latency = 0;
295 policy->cur = clock_tick;
296 policy->freq_table = table;
297
298 return 0;
299}
300
301static int us2e_freq_cpu_exit(struct cpufreq_policy *policy)
302{
303 if (cpufreq_us2e_driver)
304 us2e_freq_target(policy, 0);
305
306 return 0;
307}
308
309static int __init us2e_freq_init(void)
310{
311 unsigned long manuf, impl, ver;
312 int ret;
313
314 if (tlb_type != spitfire)
315 return -ENODEV;
316
317 __asm__("rdpr %%ver, %0" : "=r" (ver));
318 manuf = ((ver >> 48) & 0xffff);
319 impl = ((ver >> 32) & 0xffff);
320
321 if (manuf == 0x17 && impl == 0x13) {
322 struct cpufreq_driver *driver;
323
324 ret = -ENOMEM;
325 driver = kzalloc(sizeof(*driver), GFP_KERNEL);
326 if (!driver)
327 goto err_out;
328
329 us2e_freq_table = kzalloc((NR_CPUS * sizeof(*us2e_freq_table)),
330 GFP_KERNEL);
331 if (!us2e_freq_table)
332 goto err_out;
333
334 driver->init = us2e_freq_cpu_init;
335 driver->verify = cpufreq_generic_frequency_table_verify;
336 driver->target_index = us2e_freq_target;
337 driver->get = us2e_freq_get;
338 driver->exit = us2e_freq_cpu_exit;
339 strcpy(driver->name, "UltraSPARC-IIe");
340
341 cpufreq_us2e_driver = driver;
342 ret = cpufreq_register_driver(driver);
343 if (ret)
344 goto err_out;
345
346 return 0;
347
348err_out:
349 if (driver) {
350 kfree(driver);
351 cpufreq_us2e_driver = NULL;
352 }
353 kfree(us2e_freq_table);
354 us2e_freq_table = NULL;
355 return ret;
356 }
357
358 return -ENODEV;
359}
360
361static void __exit us2e_freq_exit(void)
362{
363 if (cpufreq_us2e_driver) {
364 cpufreq_unregister_driver(cpufreq_us2e_driver);
365 kfree(cpufreq_us2e_driver);
366 cpufreq_us2e_driver = NULL;
367 kfree(us2e_freq_table);
368 us2e_freq_table = NULL;
369 }
370}
371
372MODULE_AUTHOR("David S. Miller <davem@redhat.com>");
373MODULE_DESCRIPTION("cpufreq driver for UltraSPARC-IIe");
374MODULE_LICENSE("GPL");
375
376module_init(us2e_freq_init);
377module_exit(us2e_freq_exit);
1/* us2e_cpufreq.c: UltraSPARC-IIe cpu frequency support
2 *
3 * Copyright (C) 2003 David S. Miller (davem@redhat.com)
4 *
5 * Many thanks to Dominik Brodowski for fixing up the cpufreq
6 * infrastructure in order to make this driver easier to implement.
7 */
8
9#include <linux/kernel.h>
10#include <linux/module.h>
11#include <linux/sched.h>
12#include <linux/smp.h>
13#include <linux/cpufreq.h>
14#include <linux/threads.h>
15#include <linux/slab.h>
16#include <linux/delay.h>
17#include <linux/init.h>
18
19#include <asm/asi.h>
20#include <asm/timer.h>
21
22static struct cpufreq_driver *cpufreq_us2e_driver;
23
24struct us2e_freq_percpu_info {
25 struct cpufreq_frequency_table table[6];
26};
27
28/* Indexed by cpu number. */
29static struct us2e_freq_percpu_info *us2e_freq_table;
30
31#define HBIRD_MEM_CNTL0_ADDR 0x1fe0000f010UL
32#define HBIRD_ESTAR_MODE_ADDR 0x1fe0000f080UL
33
34/* UltraSPARC-IIe has five dividers: 1, 2, 4, 6, and 8. These are controlled
35 * in the ESTAR mode control register.
36 */
37#define ESTAR_MODE_DIV_1 0x0000000000000000UL
38#define ESTAR_MODE_DIV_2 0x0000000000000001UL
39#define ESTAR_MODE_DIV_4 0x0000000000000003UL
40#define ESTAR_MODE_DIV_6 0x0000000000000002UL
41#define ESTAR_MODE_DIV_8 0x0000000000000004UL
42#define ESTAR_MODE_DIV_MASK 0x0000000000000007UL
43
44#define MCTRL0_SREFRESH_ENAB 0x0000000000010000UL
45#define MCTRL0_REFR_COUNT_MASK 0x0000000000007f00UL
46#define MCTRL0_REFR_COUNT_SHIFT 8
47#define MCTRL0_REFR_INTERVAL 7800
48#define MCTRL0_REFR_CLKS_P_CNT 64
49
50static unsigned long read_hbreg(unsigned long addr)
51{
52 unsigned long ret;
53
54 __asm__ __volatile__("ldxa [%1] %2, %0"
55 : "=&r" (ret)
56 : "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E));
57 return ret;
58}
59
60static void write_hbreg(unsigned long addr, unsigned long val)
61{
62 __asm__ __volatile__("stxa %0, [%1] %2\n\t"
63 "membar #Sync"
64 : /* no outputs */
65 : "r" (val), "r" (addr), "i" (ASI_PHYS_BYPASS_EC_E)
66 : "memory");
67 if (addr == HBIRD_ESTAR_MODE_ADDR) {
68 /* Need to wait 16 clock cycles for the PLL to lock. */
69 udelay(1);
70 }
71}
72
73static void self_refresh_ctl(int enable)
74{
75 unsigned long mctrl = read_hbreg(HBIRD_MEM_CNTL0_ADDR);
76
77 if (enable)
78 mctrl |= MCTRL0_SREFRESH_ENAB;
79 else
80 mctrl &= ~MCTRL0_SREFRESH_ENAB;
81 write_hbreg(HBIRD_MEM_CNTL0_ADDR, mctrl);
82 (void) read_hbreg(HBIRD_MEM_CNTL0_ADDR);
83}
84
85static void frob_mem_refresh(int cpu_slowing_down,
86 unsigned long clock_tick,
87 unsigned long old_divisor, unsigned long divisor)
88{
89 unsigned long old_refr_count, refr_count, mctrl;
90
91 refr_count = (clock_tick * MCTRL0_REFR_INTERVAL);
92 refr_count /= (MCTRL0_REFR_CLKS_P_CNT * divisor * 1000000000UL);
93
94 mctrl = read_hbreg(HBIRD_MEM_CNTL0_ADDR);
95 old_refr_count = (mctrl & MCTRL0_REFR_COUNT_MASK)
96 >> MCTRL0_REFR_COUNT_SHIFT;
97
98 mctrl &= ~MCTRL0_REFR_COUNT_MASK;
99 mctrl |= refr_count << MCTRL0_REFR_COUNT_SHIFT;
100 write_hbreg(HBIRD_MEM_CNTL0_ADDR, mctrl);
101 mctrl = read_hbreg(HBIRD_MEM_CNTL0_ADDR);
102
103 if (cpu_slowing_down && !(mctrl & MCTRL0_SREFRESH_ENAB)) {
104 unsigned long usecs;
105
106 /* We have to wait for both refresh counts (old
107 * and new) to go to zero.
108 */
109 usecs = (MCTRL0_REFR_CLKS_P_CNT *
110 (refr_count + old_refr_count) *
111 1000000UL *
112 old_divisor) / clock_tick;
113 udelay(usecs + 1UL);
114 }
115}
116
117static void us2e_transition(unsigned long estar, unsigned long new_bits,
118 unsigned long clock_tick,
119 unsigned long old_divisor, unsigned long divisor)
120{
121 unsigned long flags;
122
123 local_irq_save(flags);
124
125 estar &= ~ESTAR_MODE_DIV_MASK;
126
127 /* This is based upon the state transition diagram in the IIe manual. */
128 if (old_divisor == 2 && divisor == 1) {
129 self_refresh_ctl(0);
130 write_hbreg(HBIRD_ESTAR_MODE_ADDR, estar | new_bits);
131 frob_mem_refresh(0, clock_tick, old_divisor, divisor);
132 } else if (old_divisor == 1 && divisor == 2) {
133 frob_mem_refresh(1, clock_tick, old_divisor, divisor);
134 write_hbreg(HBIRD_ESTAR_MODE_ADDR, estar | new_bits);
135 self_refresh_ctl(1);
136 } else if (old_divisor == 1 && divisor > 2) {
137 us2e_transition(estar, ESTAR_MODE_DIV_2, clock_tick,
138 1, 2);
139 us2e_transition(estar, new_bits, clock_tick,
140 2, divisor);
141 } else if (old_divisor > 2 && divisor == 1) {
142 us2e_transition(estar, ESTAR_MODE_DIV_2, clock_tick,
143 old_divisor, 2);
144 us2e_transition(estar, new_bits, clock_tick,
145 2, divisor);
146 } else if (old_divisor < divisor) {
147 frob_mem_refresh(0, clock_tick, old_divisor, divisor);
148 write_hbreg(HBIRD_ESTAR_MODE_ADDR, estar | new_bits);
149 } else if (old_divisor > divisor) {
150 write_hbreg(HBIRD_ESTAR_MODE_ADDR, estar | new_bits);
151 frob_mem_refresh(1, clock_tick, old_divisor, divisor);
152 } else {
153 BUG();
154 }
155
156 local_irq_restore(flags);
157}
158
159static unsigned long index_to_estar_mode(unsigned int index)
160{
161 switch (index) {
162 case 0:
163 return ESTAR_MODE_DIV_1;
164
165 case 1:
166 return ESTAR_MODE_DIV_2;
167
168 case 2:
169 return ESTAR_MODE_DIV_4;
170
171 case 3:
172 return ESTAR_MODE_DIV_6;
173
174 case 4:
175 return ESTAR_MODE_DIV_8;
176
177 default:
178 BUG();
179 }
180}
181
182static unsigned long index_to_divisor(unsigned int index)
183{
184 switch (index) {
185 case 0:
186 return 1;
187
188 case 1:
189 return 2;
190
191 case 2:
192 return 4;
193
194 case 3:
195 return 6;
196
197 case 4:
198 return 8;
199
200 default:
201 BUG();
202 }
203}
204
205static unsigned long estar_to_divisor(unsigned long estar)
206{
207 unsigned long ret;
208
209 switch (estar & ESTAR_MODE_DIV_MASK) {
210 case ESTAR_MODE_DIV_1:
211 ret = 1;
212 break;
213 case ESTAR_MODE_DIV_2:
214 ret = 2;
215 break;
216 case ESTAR_MODE_DIV_4:
217 ret = 4;
218 break;
219 case ESTAR_MODE_DIV_6:
220 ret = 6;
221 break;
222 case ESTAR_MODE_DIV_8:
223 ret = 8;
224 break;
225 default:
226 BUG();
227 }
228
229 return ret;
230}
231
232static unsigned int us2e_freq_get(unsigned int cpu)
233{
234 cpumask_t cpus_allowed;
235 unsigned long clock_tick, estar;
236
237 cpumask_copy(&cpus_allowed, tsk_cpus_allowed(current));
238 set_cpus_allowed_ptr(current, cpumask_of(cpu));
239
240 clock_tick = sparc64_get_clock_tick(cpu) / 1000;
241 estar = read_hbreg(HBIRD_ESTAR_MODE_ADDR);
242
243 set_cpus_allowed_ptr(current, &cpus_allowed);
244
245 return clock_tick / estar_to_divisor(estar);
246}
247
248static int us2e_freq_target(struct cpufreq_policy *policy, unsigned int index)
249{
250 unsigned int cpu = policy->cpu;
251 unsigned long new_bits, new_freq;
252 unsigned long clock_tick, divisor, old_divisor, estar;
253 cpumask_t cpus_allowed;
254
255 cpumask_copy(&cpus_allowed, tsk_cpus_allowed(current));
256 set_cpus_allowed_ptr(current, cpumask_of(cpu));
257
258 new_freq = clock_tick = sparc64_get_clock_tick(cpu) / 1000;
259 new_bits = index_to_estar_mode(index);
260 divisor = index_to_divisor(index);
261 new_freq /= divisor;
262
263 estar = read_hbreg(HBIRD_ESTAR_MODE_ADDR);
264
265 old_divisor = estar_to_divisor(estar);
266
267 if (old_divisor != divisor)
268 us2e_transition(estar, new_bits, clock_tick * 1000,
269 old_divisor, divisor);
270
271 set_cpus_allowed_ptr(current, &cpus_allowed);
272
273 return 0;
274}
275
276static int __init us2e_freq_cpu_init(struct cpufreq_policy *policy)
277{
278 unsigned int cpu = policy->cpu;
279 unsigned long clock_tick = sparc64_get_clock_tick(cpu) / 1000;
280 struct cpufreq_frequency_table *table =
281 &us2e_freq_table[cpu].table[0];
282
283 table[0].driver_data = 0;
284 table[0].frequency = clock_tick / 1;
285 table[1].driver_data = 1;
286 table[1].frequency = clock_tick / 2;
287 table[2].driver_data = 2;
288 table[2].frequency = clock_tick / 4;
289 table[2].driver_data = 3;
290 table[2].frequency = clock_tick / 6;
291 table[2].driver_data = 4;
292 table[2].frequency = clock_tick / 8;
293 table[2].driver_data = 5;
294 table[3].frequency = CPUFREQ_TABLE_END;
295
296 policy->cpuinfo.transition_latency = 0;
297 policy->cur = clock_tick;
298
299 return cpufreq_table_validate_and_show(policy, table);
300}
301
302static int us2e_freq_cpu_exit(struct cpufreq_policy *policy)
303{
304 if (cpufreq_us2e_driver)
305 us2e_freq_target(policy, 0);
306
307 return 0;
308}
309
310static int __init us2e_freq_init(void)
311{
312 unsigned long manuf, impl, ver;
313 int ret;
314
315 if (tlb_type != spitfire)
316 return -ENODEV;
317
318 __asm__("rdpr %%ver, %0" : "=r" (ver));
319 manuf = ((ver >> 48) & 0xffff);
320 impl = ((ver >> 32) & 0xffff);
321
322 if (manuf == 0x17 && impl == 0x13) {
323 struct cpufreq_driver *driver;
324
325 ret = -ENOMEM;
326 driver = kzalloc(sizeof(*driver), GFP_KERNEL);
327 if (!driver)
328 goto err_out;
329
330 us2e_freq_table = kzalloc((NR_CPUS * sizeof(*us2e_freq_table)),
331 GFP_KERNEL);
332 if (!us2e_freq_table)
333 goto err_out;
334
335 driver->init = us2e_freq_cpu_init;
336 driver->verify = cpufreq_generic_frequency_table_verify;
337 driver->target_index = us2e_freq_target;
338 driver->get = us2e_freq_get;
339 driver->exit = us2e_freq_cpu_exit;
340 strcpy(driver->name, "UltraSPARC-IIe");
341
342 cpufreq_us2e_driver = driver;
343 ret = cpufreq_register_driver(driver);
344 if (ret)
345 goto err_out;
346
347 return 0;
348
349err_out:
350 if (driver) {
351 kfree(driver);
352 cpufreq_us2e_driver = NULL;
353 }
354 kfree(us2e_freq_table);
355 us2e_freq_table = NULL;
356 return ret;
357 }
358
359 return -ENODEV;
360}
361
362static void __exit us2e_freq_exit(void)
363{
364 if (cpufreq_us2e_driver) {
365 cpufreq_unregister_driver(cpufreq_us2e_driver);
366 kfree(cpufreq_us2e_driver);
367 cpufreq_us2e_driver = NULL;
368 kfree(us2e_freq_table);
369 us2e_freq_table = NULL;
370 }
371}
372
373MODULE_AUTHOR("David S. Miller <davem@redhat.com>");
374MODULE_DESCRIPTION("cpufreq driver for UltraSPARC-IIe");
375MODULE_LICENSE("GPL");
376
377module_init(us2e_freq_init);
378module_exit(us2e_freq_exit);