xref: /openbmc/linux/arch/arm/mach-omap2/omap_twl.c (revision 565d76cb)
1 /**
2  * OMAP and TWL PMIC specific intializations.
3  *
4  * Copyright (C) 2010 Texas Instruments Incorporated.
5  * Thara Gopinath
6  * Copyright (C) 2009 Texas Instruments Incorporated.
7  * Nishanth Menon
8  * Copyright (C) 2009 Nokia Corporation
9  * Paul Walmsley
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License version 2 as
13  * published by the Free Software Foundation.
14  */
15 
16 #include <linux/err.h>
17 #include <linux/io.h>
18 #include <linux/kernel.h>
19 #include <linux/i2c/twl.h>
20 
21 #include "voltage.h"
22 
23 #include "pm.h"
24 
25 #define OMAP3_SRI2C_SLAVE_ADDR		0x12
26 #define OMAP3_VDD_MPU_SR_CONTROL_REG	0x00
27 #define OMAP3_VDD_CORE_SR_CONTROL_REG	0x01
28 #define OMAP3_VP_CONFIG_ERROROFFSET	0x00
29 #define OMAP3_VP_VSTEPMIN_VSTEPMIN	0x1
30 #define OMAP3_VP_VSTEPMAX_VSTEPMAX	0x04
31 #define OMAP3_VP_VLIMITTO_TIMEOUT_US	200
32 
33 #define OMAP3430_VP1_VLIMITTO_VDDMIN	0x14
34 #define OMAP3430_VP1_VLIMITTO_VDDMAX	0x42
35 #define OMAP3430_VP2_VLIMITTO_VDDMIN	0x18
36 #define OMAP3430_VP2_VLIMITTO_VDDMAX	0x2c
37 
38 #define OMAP3630_VP1_VLIMITTO_VDDMIN	0x18
39 #define OMAP3630_VP1_VLIMITTO_VDDMAX	0x3c
40 #define OMAP3630_VP2_VLIMITTO_VDDMIN	0x18
41 #define OMAP3630_VP2_VLIMITTO_VDDMAX	0x30
42 
43 #define OMAP4_SRI2C_SLAVE_ADDR		0x12
44 #define OMAP4_VDD_MPU_SR_VOLT_REG	0x55
45 #define OMAP4_VDD_IVA_SR_VOLT_REG	0x5B
46 #define OMAP4_VDD_CORE_SR_VOLT_REG	0x61
47 
48 #define OMAP4_VP_CONFIG_ERROROFFSET	0x00
49 #define OMAP4_VP_VSTEPMIN_VSTEPMIN	0x01
50 #define OMAP4_VP_VSTEPMAX_VSTEPMAX	0x04
51 #define OMAP4_VP_VLIMITTO_TIMEOUT_US	200
52 
53 #define OMAP4_VP_MPU_VLIMITTO_VDDMIN	0xA
54 #define OMAP4_VP_MPU_VLIMITTO_VDDMAX	0x39
55 #define OMAP4_VP_IVA_VLIMITTO_VDDMIN	0xA
56 #define OMAP4_VP_IVA_VLIMITTO_VDDMAX	0x2D
57 #define OMAP4_VP_CORE_VLIMITTO_VDDMIN	0xA
58 #define OMAP4_VP_CORE_VLIMITTO_VDDMAX	0x28
59 
60 static bool is_offset_valid;
61 static u8 smps_offset;
62 /*
63  * Flag to ensure Smartreflex bit in TWL
64  * being cleared in board file is not overwritten.
65  */
66 static bool __initdata twl_sr_enable_autoinit;
67 
68 #define TWL4030_DCDC_GLOBAL_CFG        0x06
69 #define REG_SMPS_OFFSET         0xE0
70 #define SMARTREFLEX_ENABLE     BIT(3)
71 
72 static unsigned long twl4030_vsel_to_uv(const u8 vsel)
73 {
74 	return (((vsel * 125) + 6000)) * 100;
75 }
76 
77 static u8 twl4030_uv_to_vsel(unsigned long uv)
78 {
79 	return DIV_ROUND_UP(uv - 600000, 12500);
80 }
81 
82 static unsigned long twl6030_vsel_to_uv(const u8 vsel)
83 {
84 	/*
85 	 * In TWL6030 depending on the value of SMPS_OFFSET
86 	 * efuse register the voltage range supported in
87 	 * standard mode can be either between 0.6V - 1.3V or
88 	 * 0.7V - 1.4V. In TWL6030 ES1.0 SMPS_OFFSET efuse
89 	 * is programmed to all 0's where as starting from
90 	 * TWL6030 ES1.1 the efuse is programmed to 1
91 	 */
92 	if (!is_offset_valid) {
93 		twl_i2c_read_u8(TWL6030_MODULE_ID0, &smps_offset,
94 				REG_SMPS_OFFSET);
95 		is_offset_valid = true;
96 	}
97 
98 	/*
99 	 * There is no specific formula for voltage to vsel
100 	 * conversion above 1.3V. There are special hardcoded
101 	 * values for voltages above 1.3V. Currently we are
102 	 * hardcoding only for 1.35 V which is used for 1GH OPP for
103 	 * OMAP4430.
104 	 */
105 	if (vsel == 0x3A)
106 		return 1350000;
107 
108 	if (smps_offset & 0x8)
109 		return ((((vsel - 1) * 125) + 7000)) * 100;
110 	else
111 		return ((((vsel - 1) * 125) + 6000)) * 100;
112 }
113 
114 static u8 twl6030_uv_to_vsel(unsigned long uv)
115 {
116 	/*
117 	 * In TWL6030 depending on the value of SMPS_OFFSET
118 	 * efuse register the voltage range supported in
119 	 * standard mode can be either between 0.6V - 1.3V or
120 	 * 0.7V - 1.4V. In TWL6030 ES1.0 SMPS_OFFSET efuse
121 	 * is programmed to all 0's where as starting from
122 	 * TWL6030 ES1.1 the efuse is programmed to 1
123 	 */
124 	if (!is_offset_valid) {
125 		twl_i2c_read_u8(TWL6030_MODULE_ID0, &smps_offset,
126 				REG_SMPS_OFFSET);
127 		is_offset_valid = true;
128 	}
129 
130 	/*
131 	 * There is no specific formula for voltage to vsel
132 	 * conversion above 1.3V. There are special hardcoded
133 	 * values for voltages above 1.3V. Currently we are
134 	 * hardcoding only for 1.35 V which is used for 1GH OPP for
135 	 * OMAP4430.
136 	 */
137 	if (uv == 1350000)
138 		return 0x3A;
139 
140 	if (smps_offset & 0x8)
141 		return DIV_ROUND_UP(uv - 700000, 12500) + 1;
142 	else
143 		return DIV_ROUND_UP(uv - 600000, 12500) + 1;
144 }
145 
146 static struct omap_volt_pmic_info omap3_mpu_volt_info = {
147 	.slew_rate		= 4000,
148 	.step_size		= 12500,
149 	.on_volt		= 1200000,
150 	.onlp_volt		= 1000000,
151 	.ret_volt		= 975000,
152 	.off_volt		= 600000,
153 	.volt_setup_time	= 0xfff,
154 	.vp_erroroffset		= OMAP3_VP_CONFIG_ERROROFFSET,
155 	.vp_vstepmin		= OMAP3_VP_VSTEPMIN_VSTEPMIN,
156 	.vp_vstepmax		= OMAP3_VP_VSTEPMAX_VSTEPMAX,
157 	.vp_vddmin		= OMAP3430_VP1_VLIMITTO_VDDMIN,
158 	.vp_vddmax		= OMAP3430_VP1_VLIMITTO_VDDMAX,
159 	.vp_timeout_us		= OMAP3_VP_VLIMITTO_TIMEOUT_US,
160 	.i2c_slave_addr		= OMAP3_SRI2C_SLAVE_ADDR,
161 	.pmic_reg		= OMAP3_VDD_MPU_SR_CONTROL_REG,
162 	.vsel_to_uv		= twl4030_vsel_to_uv,
163 	.uv_to_vsel		= twl4030_uv_to_vsel,
164 };
165 
166 static struct omap_volt_pmic_info omap3_core_volt_info = {
167 	.slew_rate		= 4000,
168 	.step_size		= 12500,
169 	.on_volt                = 1200000,
170 	.onlp_volt              = 1000000,
171 	.ret_volt               = 975000,
172 	.off_volt               = 600000,
173 	.volt_setup_time        = 0xfff,
174 	.vp_erroroffset		= OMAP3_VP_CONFIG_ERROROFFSET,
175 	.vp_vstepmin		= OMAP3_VP_VSTEPMIN_VSTEPMIN,
176 	.vp_vstepmax		= OMAP3_VP_VSTEPMAX_VSTEPMAX,
177 	.vp_vddmin		= OMAP3430_VP2_VLIMITTO_VDDMIN,
178 	.vp_vddmax		= OMAP3430_VP2_VLIMITTO_VDDMAX,
179 	.vp_timeout_us		= OMAP3_VP_VLIMITTO_TIMEOUT_US,
180 	.i2c_slave_addr		= OMAP3_SRI2C_SLAVE_ADDR,
181 	.pmic_reg		= OMAP3_VDD_CORE_SR_CONTROL_REG,
182 	.vsel_to_uv		= twl4030_vsel_to_uv,
183 	.uv_to_vsel		= twl4030_uv_to_vsel,
184 };
185 
186 static struct omap_volt_pmic_info omap4_mpu_volt_info = {
187 	.slew_rate		= 4000,
188 	.step_size		= 12500,
189 	.on_volt		= 1350000,
190 	.onlp_volt		= 1350000,
191 	.ret_volt		= 837500,
192 	.off_volt		= 600000,
193 	.volt_setup_time	= 0,
194 	.vp_erroroffset		= OMAP4_VP_CONFIG_ERROROFFSET,
195 	.vp_vstepmin		= OMAP4_VP_VSTEPMIN_VSTEPMIN,
196 	.vp_vstepmax		= OMAP4_VP_VSTEPMAX_VSTEPMAX,
197 	.vp_vddmin		= OMAP4_VP_MPU_VLIMITTO_VDDMIN,
198 	.vp_vddmax		= OMAP4_VP_MPU_VLIMITTO_VDDMAX,
199 	.vp_timeout_us		= OMAP4_VP_VLIMITTO_TIMEOUT_US,
200 	.i2c_slave_addr		= OMAP4_SRI2C_SLAVE_ADDR,
201 	.pmic_reg		= OMAP4_VDD_MPU_SR_VOLT_REG,
202 	.vsel_to_uv		= twl6030_vsel_to_uv,
203 	.uv_to_vsel		= twl6030_uv_to_vsel,
204 };
205 
206 static struct omap_volt_pmic_info omap4_iva_volt_info = {
207 	.slew_rate		= 4000,
208 	.step_size		= 12500,
209 	.on_volt		= 1100000,
210 	.onlp_volt		= 1100000,
211 	.ret_volt		= 837500,
212 	.off_volt		= 600000,
213 	.volt_setup_time	= 0,
214 	.vp_erroroffset		= OMAP4_VP_CONFIG_ERROROFFSET,
215 	.vp_vstepmin		= OMAP4_VP_VSTEPMIN_VSTEPMIN,
216 	.vp_vstepmax		= OMAP4_VP_VSTEPMAX_VSTEPMAX,
217 	.vp_vddmin		= OMAP4_VP_IVA_VLIMITTO_VDDMIN,
218 	.vp_vddmax		= OMAP4_VP_IVA_VLIMITTO_VDDMAX,
219 	.vp_timeout_us		= OMAP4_VP_VLIMITTO_TIMEOUT_US,
220 	.i2c_slave_addr		= OMAP4_SRI2C_SLAVE_ADDR,
221 	.pmic_reg		= OMAP4_VDD_IVA_SR_VOLT_REG,
222 	.vsel_to_uv		= twl6030_vsel_to_uv,
223 	.uv_to_vsel		= twl6030_uv_to_vsel,
224 };
225 
226 static struct omap_volt_pmic_info omap4_core_volt_info = {
227 	.slew_rate		= 4000,
228 	.step_size		= 12500,
229 	.on_volt		= 1100000,
230 	.onlp_volt		= 1100000,
231 	.ret_volt		= 837500,
232 	.off_volt		= 600000,
233 	.volt_setup_time	= 0,
234 	.vp_erroroffset		= OMAP4_VP_CONFIG_ERROROFFSET,
235 	.vp_vstepmin		= OMAP4_VP_VSTEPMIN_VSTEPMIN,
236 	.vp_vstepmax		= OMAP4_VP_VSTEPMAX_VSTEPMAX,
237 	.vp_vddmin		= OMAP4_VP_CORE_VLIMITTO_VDDMIN,
238 	.vp_vddmax		= OMAP4_VP_CORE_VLIMITTO_VDDMAX,
239 	.vp_timeout_us		= OMAP4_VP_VLIMITTO_TIMEOUT_US,
240 	.i2c_slave_addr		= OMAP4_SRI2C_SLAVE_ADDR,
241 	.pmic_reg		= OMAP4_VDD_CORE_SR_VOLT_REG,
242 	.vsel_to_uv		= twl6030_vsel_to_uv,
243 	.uv_to_vsel		= twl6030_uv_to_vsel,
244 };
245 
246 int __init omap4_twl_init(void)
247 {
248 	struct voltagedomain *voltdm;
249 
250 	if (!cpu_is_omap44xx())
251 		return -ENODEV;
252 
253 	voltdm = omap_voltage_domain_lookup("mpu");
254 	omap_voltage_register_pmic(voltdm, &omap4_mpu_volt_info);
255 
256 	voltdm = omap_voltage_domain_lookup("iva");
257 	omap_voltage_register_pmic(voltdm, &omap4_iva_volt_info);
258 
259 	voltdm = omap_voltage_domain_lookup("core");
260 	omap_voltage_register_pmic(voltdm, &omap4_core_volt_info);
261 
262 	return 0;
263 }
264 
265 int __init omap3_twl_init(void)
266 {
267 	struct voltagedomain *voltdm;
268 
269 	if (!cpu_is_omap34xx())
270 		return -ENODEV;
271 
272 	if (cpu_is_omap3630()) {
273 		omap3_mpu_volt_info.vp_vddmin = OMAP3630_VP1_VLIMITTO_VDDMIN;
274 		omap3_mpu_volt_info.vp_vddmax = OMAP3630_VP1_VLIMITTO_VDDMAX;
275 		omap3_core_volt_info.vp_vddmin = OMAP3630_VP2_VLIMITTO_VDDMIN;
276 		omap3_core_volt_info.vp_vddmax = OMAP3630_VP2_VLIMITTO_VDDMAX;
277 	}
278 
279 	/*
280 	 * The smartreflex bit on twl4030 specifies if the setting of voltage
281 	 * is done over the I2C_SR path. Since this setting is independent of
282 	 * the actual usage of smartreflex AVS module, we enable TWL SR bit
283 	 * by default irrespective of whether smartreflex AVS module is enabled
284 	 * on the OMAP side or not. This is because without this bit enabled,
285 	 * the voltage scaling through vp forceupdate/bypass mechanism of
286 	 * voltage scaling will not function on TWL over I2C_SR.
287 	 */
288 	if (!twl_sr_enable_autoinit)
289 		omap3_twl_set_sr_bit(true);
290 
291 	voltdm = omap_voltage_domain_lookup("mpu");
292 	omap_voltage_register_pmic(voltdm, &omap3_mpu_volt_info);
293 
294 	voltdm = omap_voltage_domain_lookup("core");
295 	omap_voltage_register_pmic(voltdm, &omap3_core_volt_info);
296 
297 	return 0;
298 }
299 
300 /**
301  * omap3_twl_set_sr_bit() - Set/Clear SR bit on TWL
302  * @enable: enable SR mode in twl or not
303  *
304  * If 'enable' is true, enables Smartreflex bit on TWL 4030 to make sure
305  * voltage scaling through OMAP SR works. Else, the smartreflex bit
306  * on twl4030 is cleared as there are platforms which use OMAP3 and T2 but
307  * use Synchronized Scaling Hardware Strategy (ENABLE_VMODE=1) and Direct
308  * Strategy Software Scaling Mode (ENABLE_VMODE=0), for setting the voltages,
309  * in those scenarios this bit is to be cleared (enable = false).
310  *
311  * Returns 0 on sucess, error is returned if I2C read/write fails.
312  */
313 int __init omap3_twl_set_sr_bit(bool enable)
314 {
315 	u8 temp;
316 	int ret;
317 	if (twl_sr_enable_autoinit)
318 		pr_warning("%s: unexpected multiple calls\n", __func__);
319 
320 	ret = twl_i2c_read_u8(TWL4030_MODULE_PM_RECEIVER, &temp,
321 					TWL4030_DCDC_GLOBAL_CFG);
322 	if (ret)
323 		goto err;
324 
325 	if (enable)
326 		temp |= SMARTREFLEX_ENABLE;
327 	else
328 		temp &= ~SMARTREFLEX_ENABLE;
329 
330 	ret = twl_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER, temp,
331 				TWL4030_DCDC_GLOBAL_CFG);
332 	if (!ret) {
333 		twl_sr_enable_autoinit = true;
334 		return 0;
335 	}
336 err:
337 	pr_err("%s: Error access to TWL4030 (%d)\n", __func__, ret);
338 	return ret;
339 }
340