drm/tests: hdmi: Fix memory leaks in drm_display_mode_from_cea_vic()
[drm/drm-misc.git] / drivers / cpufreq / pasemi-cpufreq.c
blob5fc9cb48051610a007a21fa4ae8662ea53ed4139
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2007 PA Semi, Inc
5 * Authors: Egor Martovetsky <egor@pasemi.com>
6 * Olof Johansson <olof@lixom.net>
8 * Maintained by: Olof Johansson <olof@lixom.net>
10 * Based on arch/powerpc/platforms/cell/cbe_cpufreq.c:
11 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
14 #include <linux/cpufreq.h>
15 #include <linux/timer.h>
16 #include <linux/module.h>
17 #include <linux/of_address.h>
19 #include <asm/hw_irq.h>
20 #include <asm/io.h>
21 #include <asm/time.h>
22 #include <asm/smp.h>
24 #include <platforms/pasemi/pasemi.h>
26 #define SDCASR_REG 0x0100
27 #define SDCASR_REG_STRIDE 0x1000
28 #define SDCPWR_CFGA0_REG 0x0100
29 #define SDCPWR_PWST0_REG 0x0000
30 #define SDCPWR_GIZTIME_REG 0x0440
32 /* SDCPWR_GIZTIME_REG fields */
33 #define SDCPWR_GIZTIME_GR 0x80000000
34 #define SDCPWR_GIZTIME_LONGLOCK 0x000000ff
36 /* Offset of ASR registers from SDC base */
37 #define SDCASR_OFFSET 0x120000
39 static void __iomem *sdcpwr_mapbase;
40 static void __iomem *sdcasr_mapbase;
42 /* Current astate, is used when waking up from power savings on
43 * one core, in case the other core has switched states during
44 * the idle time.
46 static int current_astate;
48 /* We support 5(A0-A4) power states excluding turbo(A5-A6) modes */
49 static struct cpufreq_frequency_table pas_freqs[] = {
50 {0, 0, 0},
51 {0, 1, 0},
52 {0, 2, 0},
53 {0, 3, 0},
54 {0, 4, 0},
55 {0, 0, CPUFREQ_TABLE_END},
59 * hardware specific functions
62 static int get_astate_freq(int astate)
64 u32 ret;
65 ret = in_le32(sdcpwr_mapbase + SDCPWR_CFGA0_REG + (astate * 0x10));
67 return ret & 0x3f;
70 static int get_cur_astate(int cpu)
72 u32 ret;
74 ret = in_le32(sdcpwr_mapbase + SDCPWR_PWST0_REG);
75 ret = (ret >> (cpu * 4)) & 0x7;
77 return ret;
80 static int get_gizmo_latency(void)
82 u32 giztime, ret;
84 giztime = in_le32(sdcpwr_mapbase + SDCPWR_GIZTIME_REG);
86 /* just provide the upper bound */
87 if (giztime & SDCPWR_GIZTIME_GR)
88 ret = (giztime & SDCPWR_GIZTIME_LONGLOCK) * 128000;
89 else
90 ret = (giztime & SDCPWR_GIZTIME_LONGLOCK) * 1000;
92 return ret;
95 static void set_astate(int cpu, unsigned int astate)
97 unsigned long flags;
99 /* Return if called before init has run */
100 if (unlikely(!sdcasr_mapbase))
101 return;
103 local_irq_save(flags);
105 out_le32(sdcasr_mapbase + SDCASR_REG + SDCASR_REG_STRIDE*cpu, astate);
107 local_irq_restore(flags);
110 int check_astate(void)
112 return get_cur_astate(hard_smp_processor_id());
115 void restore_astate(int cpu)
117 set_astate(cpu, current_astate);
121 * cpufreq functions
124 static int pas_cpufreq_cpu_init(struct cpufreq_policy *policy)
126 struct cpufreq_frequency_table *pos;
127 const u32 *max_freqp;
128 u32 max_freq;
129 int cur_astate, idx;
130 struct resource res;
131 struct device_node *cpu, *dn;
132 int err = -ENODEV;
134 cpu = of_get_cpu_node(policy->cpu, NULL);
135 if (!cpu)
136 goto out;
138 max_freqp = of_get_property(cpu, "clock-frequency", NULL);
139 of_node_put(cpu);
140 if (!max_freqp) {
141 err = -EINVAL;
142 goto out;
145 /* we need the freq in kHz */
146 max_freq = *max_freqp / 1000;
148 dn = of_find_compatible_node(NULL, NULL, "1682m-sdc");
149 if (!dn)
150 dn = of_find_compatible_node(NULL, NULL,
151 "pasemi,pwrficient-sdc");
152 if (!dn)
153 goto out;
154 err = of_address_to_resource(dn, 0, &res);
155 of_node_put(dn);
156 if (err)
157 goto out;
158 sdcasr_mapbase = ioremap(res.start + SDCASR_OFFSET, 0x2000);
159 if (!sdcasr_mapbase) {
160 err = -EINVAL;
161 goto out;
164 dn = of_find_compatible_node(NULL, NULL, "1682m-gizmo");
165 if (!dn)
166 dn = of_find_compatible_node(NULL, NULL,
167 "pasemi,pwrficient-gizmo");
168 if (!dn) {
169 err = -ENODEV;
170 goto out_unmap_sdcasr;
172 err = of_address_to_resource(dn, 0, &res);
173 of_node_put(dn);
174 if (err)
175 goto out_unmap_sdcasr;
176 sdcpwr_mapbase = ioremap(res.start, 0x1000);
177 if (!sdcpwr_mapbase) {
178 err = -EINVAL;
179 goto out_unmap_sdcasr;
182 pr_debug("init cpufreq on CPU %d\n", policy->cpu);
183 pr_debug("max clock-frequency is at %u kHz\n", max_freq);
184 pr_debug("initializing frequency table\n");
186 /* initialize frequency table */
187 cpufreq_for_each_entry_idx(pos, pas_freqs, idx) {
188 pos->frequency = get_astate_freq(pos->driver_data) * 100000;
189 pr_debug("%d: %d\n", idx, pos->frequency);
192 cur_astate = get_cur_astate(policy->cpu);
193 pr_debug("current astate is at %d\n",cur_astate);
195 policy->cur = pas_freqs[cur_astate].frequency;
196 ppc_proc_freq = policy->cur * 1000ul;
198 cpufreq_generic_init(policy, pas_freqs, get_gizmo_latency());
199 return 0;
201 out_unmap_sdcasr:
202 iounmap(sdcasr_mapbase);
203 out:
204 return err;
207 static void pas_cpufreq_cpu_exit(struct cpufreq_policy *policy)
210 * We don't support CPU hotplug. Don't unmap after the system
211 * has already made it to a running state.
213 if (system_state >= SYSTEM_RUNNING)
214 return;
216 if (sdcasr_mapbase)
217 iounmap(sdcasr_mapbase);
218 if (sdcpwr_mapbase)
219 iounmap(sdcpwr_mapbase);
222 static int pas_cpufreq_target(struct cpufreq_policy *policy,
223 unsigned int pas_astate_new)
225 int i;
227 pr_debug("setting frequency for cpu %d to %d kHz, 1/%d of max frequency\n",
228 policy->cpu,
229 pas_freqs[pas_astate_new].frequency,
230 pas_freqs[pas_astate_new].driver_data);
232 current_astate = pas_astate_new;
234 for_each_online_cpu(i)
235 set_astate(i, pas_astate_new);
237 ppc_proc_freq = pas_freqs[pas_astate_new].frequency * 1000ul;
238 return 0;
241 static struct cpufreq_driver pas_cpufreq_driver = {
242 .name = "pas-cpufreq",
243 .flags = CPUFREQ_CONST_LOOPS,
244 .init = pas_cpufreq_cpu_init,
245 .exit = pas_cpufreq_cpu_exit,
246 .verify = cpufreq_generic_frequency_table_verify,
247 .target_index = pas_cpufreq_target,
248 .attr = cpufreq_generic_attr,
252 * module init and destoy
255 static int __init pas_cpufreq_init(void)
257 if (!of_machine_is_compatible("PA6T-1682M") &&
258 !of_machine_is_compatible("pasemi,pwrficient"))
259 return -ENODEV;
261 return cpufreq_register_driver(&pas_cpufreq_driver);
264 static void __exit pas_cpufreq_exit(void)
266 cpufreq_unregister_driver(&pas_cpufreq_driver);
269 module_init(pas_cpufreq_init);
270 module_exit(pas_cpufreq_exit);
272 MODULE_DESCRIPTION("cpufreq driver for PA Semi PWRficient");
273 MODULE_LICENSE("GPL");
274 MODULE_AUTHOR("Egor Martovetsky <egor@pasemi.com>, Olof Johansson <olof@lixom.net>");