1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2011-2014, The Linux Foundation. All rights reserved.
4 * Copyright (c) 2014,2015, Linaro Ltd.
5 *
6 * SAW power controller driver
7 */
8
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/io.h>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/of.h>
15 #include <linux/of_address.h>
16 #include <linux/of_device.h>
17 #include <linux/err.h>
18 #include <linux/platform_device.h>
19 #include <soc/qcom/spm.h>
20
21 #define SPM_CTL_INDEX 0x7f
22 #define SPM_CTL_INDEX_SHIFT 4
23 #define SPM_CTL_EN BIT(0)
24
25 enum spm_reg {
26 SPM_REG_CFG,
27 SPM_REG_SPM_CTL,
28 SPM_REG_DLY,
29 SPM_REG_PMIC_DLY,
30 SPM_REG_PMIC_DATA_0,
31 SPM_REG_PMIC_DATA_1,
32 SPM_REG_VCTL,
33 SPM_REG_SEQ_ENTRY,
34 SPM_REG_SPM_STS,
35 SPM_REG_PMIC_STS,
36 SPM_REG_AVS_CTL,
37 SPM_REG_AVS_LIMIT,
38 SPM_REG_NR,
39 };
40
41 static const u16 spm_reg_offset_v4_1[SPM_REG_NR] = {
42 [SPM_REG_AVS_CTL] = 0x904,
43 [SPM_REG_AVS_LIMIT] = 0x908,
44 };
45
46 static const struct spm_reg_data spm_reg_660_gold_l2 = {
47 .reg_offset = spm_reg_offset_v4_1,
48 .avs_ctl = 0x1010031,
49 .avs_limit = 0x4580458,
50 };
51
52 static const struct spm_reg_data spm_reg_660_silver_l2 = {
53 .reg_offset = spm_reg_offset_v4_1,
54 .avs_ctl = 0x101c031,
55 .avs_limit = 0x4580458,
56 };
57
58 static const struct spm_reg_data spm_reg_8998_gold_l2 = {
59 .reg_offset = spm_reg_offset_v4_1,
60 .avs_ctl = 0x1010031,
61 .avs_limit = 0x4700470,
62 };
63
64 static const struct spm_reg_data spm_reg_8998_silver_l2 = {
65 .reg_offset = spm_reg_offset_v4_1,
66 .avs_ctl = 0x1010031,
67 .avs_limit = 0x4200420,
68 };
69
70 static const u16 spm_reg_offset_v3_0[SPM_REG_NR] = {
71 [SPM_REG_CFG] = 0x08,
72 [SPM_REG_SPM_CTL] = 0x30,
73 [SPM_REG_DLY] = 0x34,
74 [SPM_REG_SEQ_ENTRY] = 0x400,
75 };
76
77 /* SPM register data for 8916 */
78 static const struct spm_reg_data spm_reg_8916_cpu = {
79 .reg_offset = spm_reg_offset_v3_0,
80 .spm_cfg = 0x1,
81 .spm_dly = 0x3C102800,
82 .seq = { 0x60, 0x03, 0x60, 0x0B, 0x0F, 0x20, 0x10, 0x80, 0x30, 0x90,
83 0x5B, 0x60, 0x03, 0x60, 0x3B, 0x76, 0x76, 0x0B, 0x94, 0x5B,
84 0x80, 0x10, 0x26, 0x30, 0x0F },
85 .start_index[PM_SLEEP_MODE_STBY] = 0,
86 .start_index[PM_SLEEP_MODE_SPC] = 5,
87 };
88
89 static const u16 spm_reg_offset_v2_1[SPM_REG_NR] = {
90 [SPM_REG_CFG] = 0x08,
91 [SPM_REG_SPM_CTL] = 0x30,
92 [SPM_REG_DLY] = 0x34,
93 [SPM_REG_SEQ_ENTRY] = 0x80,
94 };
95
96 /* SPM register data for 8974, 8084 */
97 static const struct spm_reg_data spm_reg_8974_8084_cpu = {
98 .reg_offset = spm_reg_offset_v2_1,
99 .spm_cfg = 0x1,
100 .spm_dly = 0x3C102800,
101 .seq = { 0x03, 0x0B, 0x0F, 0x00, 0x20, 0x80, 0x10, 0xE8, 0x5B, 0x03,
102 0x3B, 0xE8, 0x5B, 0x82, 0x10, 0x0B, 0x30, 0x06, 0x26, 0x30,
103 0x0F },
104 .start_index[PM_SLEEP_MODE_STBY] = 0,
105 .start_index[PM_SLEEP_MODE_SPC] = 3,
106 };
107
108 /* SPM register data for 8226 */
109 static const struct spm_reg_data spm_reg_8226_cpu = {
110 .reg_offset = spm_reg_offset_v2_1,
111 .spm_cfg = 0x0,
112 .spm_dly = 0x3C102800,
113 .seq = { 0x60, 0x03, 0x60, 0x0B, 0x0F, 0x20, 0x10, 0x80, 0x30, 0x90,
114 0x5B, 0x60, 0x03, 0x60, 0x3B, 0x76, 0x76, 0x0B, 0x94, 0x5B,
115 0x80, 0x10, 0x26, 0x30, 0x0F },
116 .start_index[PM_SLEEP_MODE_STBY] = 0,
117 .start_index[PM_SLEEP_MODE_SPC] = 5,
118 };
119
120 static const u16 spm_reg_offset_v1_1[SPM_REG_NR] = {
121 [SPM_REG_CFG] = 0x08,
122 [SPM_REG_SPM_CTL] = 0x20,
123 [SPM_REG_PMIC_DLY] = 0x24,
124 [SPM_REG_PMIC_DATA_0] = 0x28,
125 [SPM_REG_PMIC_DATA_1] = 0x2C,
126 [SPM_REG_SEQ_ENTRY] = 0x80,
127 };
128
129 /* SPM register data for 8064 */
130 static const struct spm_reg_data spm_reg_8064_cpu = {
131 .reg_offset = spm_reg_offset_v1_1,
132 .spm_cfg = 0x1F,
133 .pmic_dly = 0x02020004,
134 .pmic_data[0] = 0x0084009C,
135 .pmic_data[1] = 0x00A4001C,
136 .seq = { 0x03, 0x0F, 0x00, 0x24, 0x54, 0x10, 0x09, 0x03, 0x01,
137 0x10, 0x54, 0x30, 0x0C, 0x24, 0x30, 0x0F },
138 .start_index[PM_SLEEP_MODE_STBY] = 0,
139 .start_index[PM_SLEEP_MODE_SPC] = 2,
140 };
141
spm_register_write(struct spm_driver_data * drv,enum spm_reg reg,u32 val)142 static inline void spm_register_write(struct spm_driver_data *drv,
143 enum spm_reg reg, u32 val)
144 {
145 if (drv->reg_data->reg_offset[reg])
146 writel_relaxed(val, drv->reg_base +
147 drv->reg_data->reg_offset[reg]);
148 }
149
150 /* Ensure a guaranteed write, before return */
spm_register_write_sync(struct spm_driver_data * drv,enum spm_reg reg,u32 val)151 static inline void spm_register_write_sync(struct spm_driver_data *drv,
152 enum spm_reg reg, u32 val)
153 {
154 u32 ret;
155
156 if (!drv->reg_data->reg_offset[reg])
157 return;
158
159 do {
160 writel_relaxed(val, drv->reg_base +
161 drv->reg_data->reg_offset[reg]);
162 ret = readl_relaxed(drv->reg_base +
163 drv->reg_data->reg_offset[reg]);
164 if (ret == val)
165 break;
166 cpu_relax();
167 } while (1);
168 }
169
spm_register_read(struct spm_driver_data * drv,enum spm_reg reg)170 static inline u32 spm_register_read(struct spm_driver_data *drv,
171 enum spm_reg reg)
172 {
173 return readl_relaxed(drv->reg_base + drv->reg_data->reg_offset[reg]);
174 }
175
spm_set_low_power_mode(struct spm_driver_data * drv,enum pm_sleep_mode mode)176 void spm_set_low_power_mode(struct spm_driver_data *drv,
177 enum pm_sleep_mode mode)
178 {
179 u32 start_index;
180 u32 ctl_val;
181
182 start_index = drv->reg_data->start_index[mode];
183
184 ctl_val = spm_register_read(drv, SPM_REG_SPM_CTL);
185 ctl_val &= ~(SPM_CTL_INDEX << SPM_CTL_INDEX_SHIFT);
186 ctl_val |= start_index << SPM_CTL_INDEX_SHIFT;
187 ctl_val |= SPM_CTL_EN;
188 spm_register_write_sync(drv, SPM_REG_SPM_CTL, ctl_val);
189 }
190
191 static const struct of_device_id spm_match_table[] = {
192 { .compatible = "qcom,sdm660-gold-saw2-v4.1-l2",
193 .data = &spm_reg_660_gold_l2 },
194 { .compatible = "qcom,sdm660-silver-saw2-v4.1-l2",
195 .data = &spm_reg_660_silver_l2 },
196 { .compatible = "qcom,msm8226-saw2-v2.1-cpu",
197 .data = &spm_reg_8226_cpu },
198 { .compatible = "qcom,msm8916-saw2-v3.0-cpu",
199 .data = &spm_reg_8916_cpu },
200 { .compatible = "qcom,msm8974-saw2-v2.1-cpu",
201 .data = &spm_reg_8974_8084_cpu },
202 { .compatible = "qcom,msm8998-gold-saw2-v4.1-l2",
203 .data = &spm_reg_8998_gold_l2 },
204 { .compatible = "qcom,msm8998-silver-saw2-v4.1-l2",
205 .data = &spm_reg_8998_silver_l2 },
206 { .compatible = "qcom,apq8084-saw2-v2.1-cpu",
207 .data = &spm_reg_8974_8084_cpu },
208 { .compatible = "qcom,apq8064-saw2-v1.1-cpu",
209 .data = &spm_reg_8064_cpu },
210 { },
211 };
212 MODULE_DEVICE_TABLE(of, spm_match_table);
213
spm_dev_probe(struct platform_device * pdev)214 static int spm_dev_probe(struct platform_device *pdev)
215 {
216 const struct of_device_id *match_id;
217 struct spm_driver_data *drv;
218 struct resource *res;
219 void __iomem *addr;
220
221 drv = devm_kzalloc(&pdev->dev, sizeof(*drv), GFP_KERNEL);
222 if (!drv)
223 return -ENOMEM;
224
225 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
226 drv->reg_base = devm_ioremap_resource(&pdev->dev, res);
227 if (IS_ERR(drv->reg_base))
228 return PTR_ERR(drv->reg_base);
229
230 match_id = of_match_node(spm_match_table, pdev->dev.of_node);
231 if (!match_id)
232 return -ENODEV;
233
234 drv->reg_data = match_id->data;
235 platform_set_drvdata(pdev, drv);
236
237 /* Write the SPM sequences first.. */
238 addr = drv->reg_base + drv->reg_data->reg_offset[SPM_REG_SEQ_ENTRY];
239 __iowrite32_copy(addr, drv->reg_data->seq,
240 ARRAY_SIZE(drv->reg_data->seq) / 4);
241
242 /*
243 * ..and then the control registers.
244 * On some SoC if the control registers are written first and if the
245 * CPU was held in reset, the reset signal could trigger the SPM state
246 * machine, before the sequences are completely written.
247 */
248 spm_register_write(drv, SPM_REG_AVS_CTL, drv->reg_data->avs_ctl);
249 spm_register_write(drv, SPM_REG_AVS_LIMIT, drv->reg_data->avs_limit);
250 spm_register_write(drv, SPM_REG_CFG, drv->reg_data->spm_cfg);
251 spm_register_write(drv, SPM_REG_DLY, drv->reg_data->spm_dly);
252 spm_register_write(drv, SPM_REG_PMIC_DLY, drv->reg_data->pmic_dly);
253 spm_register_write(drv, SPM_REG_PMIC_DATA_0,
254 drv->reg_data->pmic_data[0]);
255 spm_register_write(drv, SPM_REG_PMIC_DATA_1,
256 drv->reg_data->pmic_data[1]);
257
258 /* Set up Standby as the default low power mode */
259 if (drv->reg_data->reg_offset[SPM_REG_SPM_CTL])
260 spm_set_low_power_mode(drv, PM_SLEEP_MODE_STBY);
261
262 return 0;
263 }
264
265 static struct platform_driver spm_driver = {
266 .probe = spm_dev_probe,
267 .driver = {
268 .name = "qcom_spm",
269 .of_match_table = spm_match_table,
270 },
271 };
272
qcom_spm_init(void)273 static int __init qcom_spm_init(void)
274 {
275 return platform_driver_register(&spm_driver);
276 }
277 arch_initcall(qcom_spm_init);
278
279 MODULE_LICENSE("GPL v2");
280