1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2
3 #include <console/console.h>
4 #include <device/mmio.h>
5 #include <device/i2c_simple.h>
6
7 #include "max77686.h"
8
9 /* Chip register numbers (not exported from this module) */
10 enum {
11 REG_BBAT = 0x7e,
12
13 /* Bits for BBAT */
14 BBAT_BBCHOSTEN_MASK = 1 << 0,
15 BBAT_BBCVS_SHIFT = 3,
16 BBAT_BBCVS_MASK = 3 << BBAT_BBCVS_SHIFT,
17 };
18
19 /*
20 * Max77686 parameters values
21 * see max77686.h for parameters details
22 */
23 struct max77686_para max77686_param[] = {/*{vol_addr, vol_bitpos,
24 vol_bitmask, reg_enaddr, reg_enbitpos, reg_enbitmask, reg_enbiton,
25 reg_enbitoff, vol_min, vol_div}*/
26 {/* PMIC_BUCK1 */ 0x11, 0x0, 0x3F, 0x10, 0x0, 0x3, 0x3, 0x0, 750, 50000},
27 {/* PMIC_BUCK2 */ 0x14, 0x0, 0xFF, 0x12, 0x4, 0x3, 0x1, 0x0, 600, 12500},
28 {/* PMIC_BUCK3 */ 0x1E, 0x0, 0xFF, 0x1C, 0x4, 0x3, 0x1, 0x0, 600, 12500},
29 {/* PMIC_BUCK4 */ 0x28, 0x0, 0xFF, 0x26, 0x4, 0x3, 0x1, 0x0, 600, 12500},
30 {/* PMIC_BUCK5 */ 0x31, 0x0, 0x3F, 0x30, 0x0, 0x3, 0x3, 0x0, 750, 50000},
31 {/* PMIC_BUCK6 */ 0x33, 0x0, 0x3F, 0x32, 0x0, 0x3, 0x3, 0x0, 750, 50000},
32 {/* PMIC_BUCK7 */ 0x35, 0x0, 0x3F, 0x34, 0x0, 0x3, 0x3, 0x0, 750, 50000},
33 {/* PMIC_BUCK8 */ 0x37, 0x0, 0x3F, 0x36, 0x0, 0x3, 0x3, 0x0, 750, 50000},
34 {/* PMIC_BUCK9 */ 0x39, 0x0, 0x3F, 0x38, 0x0, 0x3, 0x3, 0x0, 750, 50000},
35 {/* PMIC_LDO1 */ 0x40, 0x0, 0x3F, 0x40, 0x6, 0x3, 0x3, 0x0, 800, 25000},
36 {/* PMIC_LDO2 */ 0x41, 0x0, 0x3F, 0x41, 0x6, 0x3, 0x1, 0x0, 800, 25000},
37 {/* PMIC_LDO3 */ 0x42, 0x0, 0x3F, 0x42, 0x6, 0x3, 0x3, 0x0, 800, 50000},
38 {/* PMIC_LDO4 */ 0x43, 0x0, 0x3F, 0x43, 0x6, 0x3, 0x3, 0x0, 800, 50000},
39 {/* PMIC_LDO5 */ 0x44, 0x0, 0x3F, 0x44, 0x6, 0x3, 0x3, 0x0, 800, 50000},
40 {/* PMIC_LDO6 */ 0x45, 0x0, 0x3F, 0x45, 0x6, 0x3, 0x1, 0x0, 800, 25000},
41 {/* PMIC_LDO7 */ 0x46, 0x0, 0x3F, 0x46, 0x6, 0x3, 0x1, 0x0, 800, 25000},
42 {/* PMIC_LDO8 */ 0x47, 0x0, 0x3F, 0x47, 0x6, 0x3, 0x1, 0x0, 800, 25000},
43 {/* PMIC_LDO9 */ 0x48, 0x0, 0x3F, 0x48, 0x6, 0x3, 0x3, 0x0, 800, 50000},
44 {/* PMIC_LDO10 */ 0x49, 0x0, 0x3F, 0x49, 0x6, 0x3, 0x1, 0x0, 800, 50000},
45 {/* PMIC_LDO11 */ 0x4A, 0x0, 0x3F, 0x4A, 0x6, 0x3, 0x1, 0x0, 800, 50000},
46 {/* PMIC_LDO12 */ 0x4B, 0x0, 0x3F, 0x4B, 0x6, 0x3, 0x1, 0x0, 800, 50000},
47 {/* PMIC_LDO13 */ 0x4C, 0x0, 0x3F, 0x4C, 0x6, 0x3, 0x3, 0x0, 800, 50000},
48 {/* PMIC_LDO14 */ 0x4D, 0x0, 0x3F, 0x4D, 0x6, 0x3, 0x1, 0x0, 800, 50000},
49 {/* PMIC_LDO15 */ 0x4E, 0x0, 0x3F, 0x4E, 0x6, 0x3, 0x1, 0x0, 800, 25000},
50 {/* PMIC_LDO16 */ 0x4F, 0x0, 0x3F, 0x4F, 0x6, 0x3, 0x1, 0x0, 800, 50000},
51 {/* PMIC_LDO17 */ 0x50, 0x0, 0x3F, 0x50, 0x6, 0x3, 0x3, 0x0, 800, 50000},
52 {/* PMIC_LDO18 */ 0x51, 0x0, 0x3F, 0x51, 0x6, 0x3, 0x3, 0x0, 800, 50000},
53 {/* PMIC_LDO19 */ 0x52, 0x0, 0x3F, 0x52, 0x6, 0x3, 0x3, 0x0, 800, 50000},
54 {/* PMIC_LDO20 */ 0x53, 0x0, 0x3F, 0x53, 0x6, 0x3, 0x3, 0x0, 800, 50000},
55 {/* PMIC_LDO21 */ 0x54, 0x0, 0x3F, 0x54, 0x6, 0x3, 0x3, 0x0, 800, 50000},
56 {/* PMIC_LDO22 */ 0x55, 0x0, 0x3F, 0x55, 0x6, 0x3, 0x3, 0x0, 800, 50000},
57 {/* PMIC_LDO23 */ 0x56, 0x0, 0x3F, 0x56, 0x6, 0x3, 0x3, 0x0, 800, 50000},
58 {/* PMIC_LDO24 */ 0x57, 0x0, 0x3F, 0x57, 0x6, 0x3, 0x3, 0x0, 800, 50000},
59 {/* PMIC_LDO25 */ 0x58, 0x0, 0x3F, 0x58, 0x6, 0x3, 0x3, 0x0, 800, 50000},
60 {/* PMIC_LDO26 */ 0x59, 0x0, 0x3F, 0x59, 0x6, 0x3, 0x3, 0x0, 800, 50000},
61 {/* PMIC_EN32KHZ_CP */ 0x0, 0x0, 0x0, 0x7F, 0x1, 0x1, 0x1, 0x0, 0x0, 0x0},
62 };
63
64 /*
65 * Write a value to a register
66 *
67 * @param chip_addr i2c addr for max77686
68 * @param reg reg number to write
69 * @param val value to be written
70 *
71 */
max77686_i2c_write(unsigned int bus,unsigned char chip_addr,unsigned int reg,unsigned char val)72 static inline int max77686_i2c_write(unsigned int bus, unsigned char chip_addr,
73 unsigned int reg, unsigned char val)
74 {
75 return i2c_writeb(bus, chip_addr, reg, val);
76 }
77
78 /*
79 * Read a value from a register
80 *
81 * @param chip_addr i2c addr for max77686
82 * @param reg reg number to write
83 * @param val value to be written
84 *
85 */
max77686_i2c_read(unsigned int bus,unsigned char chip_addr,unsigned int reg,unsigned char * val)86 static inline int max77686_i2c_read(unsigned int bus, unsigned char chip_addr,
87 unsigned int reg, unsigned char *val)
88 {
89 return i2c_readb(bus, chip_addr, reg, (uint8_t *)val);
90 }
91
92 /*
93 * Enable the max77686 register
94 *
95 * @param reg register number of buck/ldo to be enabled
96 * @param enable enable or disable bit
97 *
98 * REG_DISABLE = 0,
99 needed to set the buck/ldo enable bit OFF
100 * @return Return 0 if ok, else -1
101 */
max77686_enablereg(unsigned int bus,enum max77686_regnum reg,int enable)102 static int max77686_enablereg(unsigned int bus, enum max77686_regnum reg, int enable)
103 {
104 struct max77686_para *pmic;
105 unsigned char read_data;
106 int ret;
107
108 pmic = &max77686_param[reg];
109
110 ret = max77686_i2c_read(bus, MAX77686_I2C_ADDR, pmic->reg_enaddr,
111 &read_data);
112 if (ret != 0) {
113 printk(BIOS_DEBUG, "max77686 i2c read failed.\n");
114 return -1;
115 }
116
117 if (enable == REG_DISABLE) {
118 clrbits8(&read_data,
119 pmic->reg_enbitmask << pmic->reg_enbitpos);
120 } else {
121 clrsetbits8(&read_data,
122 pmic->reg_enbitmask << pmic->reg_enbitpos,
123 pmic->reg_enbiton << pmic->reg_enbitpos);
124 }
125
126 ret = max77686_i2c_write(bus, MAX77686_I2C_ADDR,
127 pmic->reg_enaddr, read_data);
128 if (ret != 0) {
129 printk(BIOS_DEBUG, "max77686 i2c write failed.\n");
130 return -1;
131 }
132
133 return 0;
134 }
135
max77686_volsetting(unsigned int bus,enum max77686_regnum reg,unsigned int volt,int enable,int volt_units)136 int max77686_volsetting(unsigned int bus, enum max77686_regnum reg,
137 unsigned int volt, int enable, int volt_units)
138 {
139 struct max77686_para *pmic;
140 unsigned char read_data;
141 int vol_level = 0;
142 int ret;
143
144 pmic = &max77686_param[reg];
145
146 if (pmic->vol_addr == 0) {
147 printk(BIOS_DEBUG, "not a voltage register.\n");
148 return -1;
149 }
150
151 ret = max77686_i2c_read(bus, MAX77686_I2C_ADDR, pmic->vol_addr, &read_data);
152 if (ret != 0) {
153 printk(BIOS_DEBUG, "max77686 i2c read failed.\n");
154 return -1;
155 }
156
157 if (volt_units == MAX77686_UV)
158 vol_level = volt - (u32)pmic->vol_min * 1000;
159 else
160 vol_level = (volt - (u32)pmic->vol_min) * 1000;
161
162 if (vol_level < 0) {
163 printk(BIOS_DEBUG, "Not a valid voltage level to set\n");
164 return -1;
165 }
166 vol_level /= (u32)pmic->vol_div;
167
168 clrsetbits8(&read_data, pmic->vol_bitmask << pmic->vol_bitpos,
169 vol_level << pmic->vol_bitpos);
170
171 ret = max77686_i2c_write(bus, MAX77686_I2C_ADDR, pmic->vol_addr, read_data);
172 if (ret != 0) {
173 printk(BIOS_DEBUG, "max77686 i2c write failed.\n");
174 return -1;
175 }
176
177 ret = max77686_enablereg(bus, reg, enable);
178 if (ret != 0) {
179 printk(BIOS_DEBUG, "Failed to enable buck/ldo.\n");
180 return -1;
181 }
182 return 0;
183 }
184
max77686_enable_32khz_cp(unsigned int bus)185 int max77686_enable_32khz_cp(unsigned int bus)
186 {
187 return max77686_enablereg(bus, PMIC_EN32KHZ_CP, REG_ENABLE);
188 }
189
max77686_disable_backup_batt(unsigned int bus)190 int max77686_disable_backup_batt(unsigned int bus)
191 {
192 unsigned char val;
193 int ret;
194
195 ret = max77686_i2c_read(bus, MAX77686_I2C_ADDR, REG_BBAT, &val);
196 if (ret) {
197 printk(BIOS_DEBUG, "max77686 i2c read failed\n");
198 return ret;
199 }
200
201 /* If we already have the correct values, exit */
202 if ((val & (BBAT_BBCVS_MASK | BBAT_BBCHOSTEN_MASK)) ==
203 BBAT_BBCVS_MASK)
204 return 0;
205
206 /* First disable charging */
207 val &= ~BBAT_BBCHOSTEN_MASK;
208 ret = max77686_i2c_write(bus, MAX77686_I2C_ADDR, REG_BBAT, val);
209 if (ret) {
210 printk(BIOS_DEBUG, "max77686 i2c write failed\n");
211 return -1;
212 }
213
214 /* Finally select 3.5V to minimize power consumption */
215 val |= BBAT_BBCVS_MASK;
216 ret = max77686_i2c_write(bus, MAX77686_I2C_ADDR, REG_BBAT, val);
217 if (ret) {
218 printk(BIOS_DEBUG, "max77686 i2c write failed\n");
219 return -1;
220 }
221
222 return 0;
223 }
224