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6#include <linux/cpufreq.h>
7#include <linux/dma-mapping.h>
8#include <linux/module.h>
9#include <linux/of.h>
10#include <linux/platform_device.h>
11
12#include <soc/tegra/bpmp.h>
13#include <soc/tegra/bpmp-abi.h>
14
15#define EDVD_CORE_VOLT_FREQ(core) (0x20 + (core) * 0x4)
16#define EDVD_CORE_VOLT_FREQ_F_SHIFT 0
17#define EDVD_CORE_VOLT_FREQ_V_SHIFT 16
18
19struct tegra186_cpufreq_cluster_info {
20 unsigned long offset;
21 int cpus[4];
22 unsigned int bpmp_cluster_id;
23};
24
25#define NO_CPU -1
26static const struct tegra186_cpufreq_cluster_info tegra186_clusters[] = {
27
28 {
29 .offset = SZ_64K * 7,
30 .cpus = { 1, 2, NO_CPU, NO_CPU },
31 .bpmp_cluster_id = 0,
32 },
33
34 {
35 .offset = SZ_64K * 6,
36 .cpus = { 0, 3, 4, 5 },
37 .bpmp_cluster_id = 1,
38 },
39};
40
41struct tegra186_cpufreq_cluster {
42 const struct tegra186_cpufreq_cluster_info *info;
43 struct cpufreq_frequency_table *table;
44};
45
46struct tegra186_cpufreq_data {
47 void __iomem *regs;
48
49 size_t num_clusters;
50 struct tegra186_cpufreq_cluster *clusters;
51};
52
53static int tegra186_cpufreq_init(struct cpufreq_policy *policy)
54{
55 struct tegra186_cpufreq_data *data = cpufreq_get_driver_data();
56 unsigned int i;
57
58 for (i = 0; i < data->num_clusters; i++) {
59 struct tegra186_cpufreq_cluster *cluster = &data->clusters[i];
60 const struct tegra186_cpufreq_cluster_info *info =
61 cluster->info;
62 int core;
63
64 for (core = 0; core < ARRAY_SIZE(info->cpus); core++) {
65 if (info->cpus[core] == policy->cpu)
66 break;
67 }
68 if (core == ARRAY_SIZE(info->cpus))
69 continue;
70
71 policy->driver_data =
72 data->regs + info->offset + EDVD_CORE_VOLT_FREQ(core);
73 policy->freq_table = cluster->table;
74 break;
75 }
76
77 policy->cpuinfo.transition_latency = 300 * 1000;
78
79 return 0;
80}
81
82static int tegra186_cpufreq_set_target(struct cpufreq_policy *policy,
83 unsigned int index)
84{
85 struct cpufreq_frequency_table *tbl = policy->freq_table + index;
86 void __iomem *edvd_reg = policy->driver_data;
87 u32 edvd_val = tbl->driver_data;
88
89 writel(edvd_val, edvd_reg);
90
91 return 0;
92}
93
94static struct cpufreq_driver tegra186_cpufreq_driver = {
95 .name = "tegra186",
96 .flags = CPUFREQ_STICKY | CPUFREQ_HAVE_GOVERNOR_PER_POLICY,
97 .verify = cpufreq_generic_frequency_table_verify,
98 .target_index = tegra186_cpufreq_set_target,
99 .init = tegra186_cpufreq_init,
100 .attr = cpufreq_generic_attr,
101};
102
103static struct cpufreq_frequency_table *init_vhint_table(
104 struct platform_device *pdev, struct tegra_bpmp *bpmp,
105 unsigned int cluster_id)
106{
107 struct cpufreq_frequency_table *table;
108 struct mrq_cpu_vhint_request req;
109 struct tegra_bpmp_message msg;
110 struct cpu_vhint_data *data;
111 int err, i, j, num_rates = 0;
112 dma_addr_t phys;
113 void *virt;
114
115 virt = dma_alloc_coherent(bpmp->dev, sizeof(*data), &phys,
116 GFP_KERNEL);
117 if (!virt)
118 return ERR_PTR(-ENOMEM);
119
120 data = (struct cpu_vhint_data *)virt;
121
122 memset(&req, 0, sizeof(req));
123 req.addr = phys;
124 req.cluster_id = cluster_id;
125
126 memset(&msg, 0, sizeof(msg));
127 msg.mrq = MRQ_CPU_VHINT;
128 msg.tx.data = &req;
129 msg.tx.size = sizeof(req);
130
131 err = tegra_bpmp_transfer(bpmp, &msg);
132 if (err) {
133 table = ERR_PTR(err);
134 goto free;
135 }
136
137 for (i = data->vfloor; i <= data->vceil; i++) {
138 u16 ndiv = data->ndiv[i];
139
140 if (ndiv < data->ndiv_min || ndiv > data->ndiv_max)
141 continue;
142
143
144 if (i > 0 && ndiv == data->ndiv[i - 1])
145 continue;
146
147 num_rates++;
148 }
149
150 table = devm_kcalloc(&pdev->dev, num_rates + 1, sizeof(*table),
151 GFP_KERNEL);
152 if (!table) {
153 table = ERR_PTR(-ENOMEM);
154 goto free;
155 }
156
157 for (i = data->vfloor, j = 0; i <= data->vceil; i++) {
158 struct cpufreq_frequency_table *point;
159 u16 ndiv = data->ndiv[i];
160 u32 edvd_val = 0;
161
162 if (ndiv < data->ndiv_min || ndiv > data->ndiv_max)
163 continue;
164
165
166 if (i > 0 && ndiv == data->ndiv[i - 1])
167 continue;
168
169 edvd_val |= i << EDVD_CORE_VOLT_FREQ_V_SHIFT;
170 edvd_val |= ndiv << EDVD_CORE_VOLT_FREQ_F_SHIFT;
171
172 point = &table[j++];
173 point->driver_data = edvd_val;
174 point->frequency = data->ref_clk_hz * ndiv / data->pdiv /
175 data->mdiv / 1000;
176 }
177
178 table[j].frequency = CPUFREQ_TABLE_END;
179
180free:
181 dma_free_coherent(bpmp->dev, sizeof(*data), virt, phys);
182
183 return table;
184}
185
186static int tegra186_cpufreq_probe(struct platform_device *pdev)
187{
188 struct tegra186_cpufreq_data *data;
189 struct tegra_bpmp *bpmp;
190 struct resource *res;
191 unsigned int i = 0, err;
192
193 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
194 if (!data)
195 return -ENOMEM;
196
197 data->clusters = devm_kcalloc(&pdev->dev, ARRAY_SIZE(tegra186_clusters),
198 sizeof(*data->clusters), GFP_KERNEL);
199 if (!data->clusters)
200 return -ENOMEM;
201
202 data->num_clusters = ARRAY_SIZE(tegra186_clusters);
203
204 bpmp = tegra_bpmp_get(&pdev->dev);
205 if (IS_ERR(bpmp))
206 return PTR_ERR(bpmp);
207
208 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
209 data->regs = devm_ioremap_resource(&pdev->dev, res);
210 if (IS_ERR(data->regs)) {
211 err = PTR_ERR(data->regs);
212 goto put_bpmp;
213 }
214
215 for (i = 0; i < data->num_clusters; i++) {
216 struct tegra186_cpufreq_cluster *cluster = &data->clusters[i];
217
218 cluster->info = &tegra186_clusters[i];
219 cluster->table = init_vhint_table(
220 pdev, bpmp, cluster->info->bpmp_cluster_id);
221 if (IS_ERR(cluster->table)) {
222 err = PTR_ERR(cluster->table);
223 goto put_bpmp;
224 }
225 }
226
227 tegra_bpmp_put(bpmp);
228
229 tegra186_cpufreq_driver.driver_data = data;
230
231 err = cpufreq_register_driver(&tegra186_cpufreq_driver);
232 if (err)
233 return err;
234
235 return 0;
236
237put_bpmp:
238 tegra_bpmp_put(bpmp);
239
240 return err;
241}
242
243static int tegra186_cpufreq_remove(struct platform_device *pdev)
244{
245 cpufreq_unregister_driver(&tegra186_cpufreq_driver);
246
247 return 0;
248}
249
250static const struct of_device_id tegra186_cpufreq_of_match[] = {
251 { .compatible = "nvidia,tegra186-ccplex-cluster", },
252 { }
253};
254MODULE_DEVICE_TABLE(of, tegra186_cpufreq_of_match);
255
256static struct platform_driver tegra186_cpufreq_platform_driver = {
257 .driver = {
258 .name = "tegra186-cpufreq",
259 .of_match_table = tegra186_cpufreq_of_match,
260 },
261 .probe = tegra186_cpufreq_probe,
262 .remove = tegra186_cpufreq_remove,
263};
264module_platform_driver(tegra186_cpufreq_platform_driver);
265
266MODULE_AUTHOR("Mikko Perttunen <mperttunen@nvidia.com>");
267MODULE_DESCRIPTION("NVIDIA Tegra186 cpufreq driver");
268MODULE_LICENSE("GPL v2");
269
