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