Angel Pons | 8a3453f | 2020-04-02 23:48:19 +0200 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | /* This file is part of the coreboot project. */ |
Nico Huber | ffea237 | 2017-08-24 23:30:44 +0200 | [diff] [blame] | 3 | |
| 4 | #include <delay.h> |
| 5 | #include <timer.h> |
| 6 | #include <console/console.h> |
| 7 | #include <device/device.h> |
| 8 | #include <device/i2c_bus.h> |
| 9 | |
| 10 | #include "lm96000.h" |
| 11 | #include "chip.h" |
| 12 | |
| 13 | static inline int lm96000_read(struct device *const dev, const u8 reg) |
| 14 | { |
| 15 | return i2c_dev_readb_at(dev, reg); |
| 16 | } |
| 17 | |
| 18 | static inline int lm96000_write(struct device *const dev, |
| 19 | const u8 reg, const u8 value) |
| 20 | { |
| 21 | return i2c_dev_writeb_at(dev, reg, value); |
| 22 | } |
| 23 | |
| 24 | static inline int lm96000_update(struct device *const dev, const u8 reg, |
| 25 | const u8 clear_mask, const u8 set_mask) |
| 26 | { |
| 27 | const int val = i2c_dev_readb_at(dev, reg); |
| 28 | if (val < 0) |
| 29 | return val; |
| 30 | return i2c_dev_writeb_at(dev, reg, (val & ~clear_mask) | set_mask); |
| 31 | } |
| 32 | |
| 33 | static const unsigned int ref_mv[] = { 2500, 2250, 3300, 5000, 12000 }; |
| 34 | |
| 35 | static u8 lm96000_to_low_limit(const enum lm96000_vin ref, const u16 limit) |
| 36 | { |
| 37 | const unsigned int reg = |
| 38 | (unsigned int)limit * 0xc0 / ref_mv[ref]; |
| 39 | return reg < 0xff ? reg : 0xff; |
| 40 | } |
| 41 | |
| 42 | static u8 lm96000_to_high_limit(const enum lm96000_vin ref, const u16 limit) |
| 43 | { |
| 44 | const unsigned int reg = |
| 45 | DIV_ROUND_UP((unsigned int)limit * 0xc0, ref_mv[ref]); |
| 46 | return reg < 0xff ? reg : 0xff; |
| 47 | } |
| 48 | |
| 49 | static void lm96000_set_vin_limits(struct device *const dev, |
| 50 | const struct drivers_i2c_lm96000_config *const config) |
| 51 | { |
| 52 | unsigned int i; |
| 53 | |
| 54 | for (i = 0; i < LM96000_VIN_CNT; ++i) { |
| 55 | lm96000_write(dev, LM96000_VIN_LOW_LIMIT(i), |
| 56 | lm96000_to_low_limit(i, config->vin[i].low)); |
| 57 | if (config->vin[i].high > config->vin[i].low) |
| 58 | lm96000_write(dev, LM96000_VIN_HIGH_LIMIT(i), |
| 59 | lm96000_to_high_limit(i, config->vin[i].high)); |
| 60 | else |
| 61 | lm96000_write(dev, LM96000_VIN_HIGH_LIMIT(i), 0xff); |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | static void lm96000_set_temp_limits(struct device *const dev, |
| 66 | const struct drivers_i2c_lm96000_config *const config) |
| 67 | { |
| 68 | unsigned int i; |
| 69 | |
| 70 | for (i = 0; i < LM96000_TEMP_IN_CNT; ++i) { |
| 71 | lm96000_write(dev, LM96000_TEMP_LOW_LIMIT(i), |
| 72 | config->temp_in[i].low); |
| 73 | if (config->temp_in[i].high > config->temp_in[i].low) |
| 74 | lm96000_write(dev, LM96000_TEMP_HIGH_LIMIT(i), |
| 75 | config->temp_in[i].high); |
| 76 | else |
| 77 | lm96000_write(dev, LM96000_TEMP_HIGH_LIMIT(i), 0x7f); |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | static u16 lm96000_rpm_to_tach(const u16 rpm) |
| 82 | { |
| 83 | return rpm ? (60 * 90000 / rpm) & 0xfffc : 0xfffc; |
| 84 | } |
| 85 | |
| 86 | static void lm96000_set_fan_limits(struct device *const dev, |
| 87 | const struct drivers_i2c_lm96000_config *const config) |
| 88 | { |
| 89 | unsigned int i; |
| 90 | |
| 91 | for (i = 0; i < LM96000_FAN_IN_CNT; ++i) { |
| 92 | const u16 tach = lm96000_rpm_to_tach(config->fan_in[i].low); |
| 93 | lm96000_write(dev, LM96000_FAN_LOW_LIMIT(i), tach & 0xff); |
| 94 | lm96000_write(dev, LM96000_FAN_LOW_LIMIT(i) + 1, tach >> 8); |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | static u8 lm96000_to_duty(const u8 duty_cycle) |
| 99 | { |
| 100 | return duty_cycle * 255 / 100; |
| 101 | } |
| 102 | |
| 103 | static void lm96000_configure_pwm(struct device *const dev, |
| 104 | const unsigned int fan, |
| 105 | const struct lm96000_fan_config *const config) |
| 106 | { |
| 107 | lm96000_update(dev, LM96000_FAN_CFG(fan), |
| 108 | LM96000_FAN_CFG_MODE_MASK | LM96000_FAN_CFG_PWM_INVERT | |
| 109 | LM96000_FAN_CFG_SPINUP_MASK, |
| 110 | ((config->mode << LM96000_FAN_CFG_MODE_SHIFT) |
| 111 | & LM96000_FAN_CFG_MODE_MASK) | |
| 112 | (config->invert ? LM96000_FAN_CFG_PWM_INVERT : 0) | |
| 113 | config->spinup); |
| 114 | lm96000_update(dev, LM96000_FAN_FREQ(fan), |
| 115 | LM96000_FAN_FREQ_MASK, config->freq); |
| 116 | lm96000_update(dev, LM96000_TACH_MONITOR_MODE, |
| 117 | LM96000_TACH_MODE_FAN_MASK(fan), |
| 118 | config->freq <= LM96000_PWM_94HZ |
| 119 | ? config->tach << LM96000_TACH_MODE_FAN_SHIFT(fan) : 0); |
| 120 | |
| 121 | switch (config->mode) { |
| 122 | case LM96000_FAN_ZONE_1_AUTO: |
| 123 | case LM96000_FAN_ZONE_2_AUTO: |
| 124 | case LM96000_FAN_ZONE_3_AUTO: |
| 125 | case LM96000_FAN_HOTTEST_23: |
| 126 | case LM96000_FAN_HOTTEST_123: |
| 127 | lm96000_write(dev, LM96000_FAN_MIN_PWM(fan), |
| 128 | lm96000_to_duty(config->min_duty)); |
| 129 | break; |
| 130 | case LM96000_FAN_MANUAL: |
| 131 | lm96000_write(dev, LM96000_FAN_DUTY(fan), |
| 132 | lm96000_to_duty(config->duty_cycle)); |
| 133 | break; |
| 134 | default: |
| 135 | break; |
| 136 | } |
| 137 | } |
| 138 | |
| 139 | static void lm96000_configure_temp_zone(struct device *const dev, |
| 140 | const unsigned int zone, |
| 141 | const struct lm96000_temp_zone *const config) |
| 142 | { |
| 143 | static const u8 temp_range[] = |
| 144 | { 2, 3, 3, 4, 5, 7, 8, 10, 13, 16, 20, 27, 32, 40, 53, 80 }; |
| 145 | unsigned int i; |
| 146 | |
Nico Huber | b56fcfe | 2019-08-06 18:05:50 +0200 | [diff] [blame] | 147 | /* find longest range that starts from `low_temp` */ |
Nico Huber | ffea237 | 2017-08-24 23:30:44 +0200 | [diff] [blame] | 148 | for (i = ARRAY_SIZE(temp_range) - 1; i > 0; --i) { |
Nico Huber | b56fcfe | 2019-08-06 18:05:50 +0200 | [diff] [blame] | 149 | if (config->low_temp + temp_range[i] <= config->target_temp) |
Nico Huber | ffea237 | 2017-08-24 23:30:44 +0200 | [diff] [blame] | 150 | break; |
| 151 | } |
| 152 | |
| 153 | lm96000_update(dev, LM96000_ZONE_RANGE(zone), |
| 154 | LM96000_ZONE_RANGE_MASK, i << LM96000_ZONE_RANGE_SHIFT); |
| 155 | lm96000_write(dev, LM96000_ZONE_TEMP_LOW(zone), |
| 156 | config->target_temp >= temp_range[i] |
| 157 | ? config->target_temp - temp_range[i] |
| 158 | : 0); |
| 159 | lm96000_write(dev, LM96000_ZONE_TEMP_PANIC(zone), |
| 160 | config->panic_temp ? config->panic_temp : 100); |
Nico Huber | b56fcfe | 2019-08-06 18:05:50 +0200 | [diff] [blame] | 161 | lm96000_update(dev, LM96000_ZONE_SMOOTH(zone), |
| 162 | LM96000_ZONE_SMOOTH_MASK(zone), |
| 163 | LM96000_ZONE_SMOOTH_EN(zone) | 0); /* 0: 35s */ |
Nico Huber | ffea237 | 2017-08-24 23:30:44 +0200 | [diff] [blame] | 164 | lm96000_update(dev, LM96000_FAN_MIN_OFF, |
| 165 | LM96000_FAN_MIN(zone), |
| 166 | config->min_off ? LM96000_FAN_MIN(zone) : 0); |
Nico Huber | b56fcfe | 2019-08-06 18:05:50 +0200 | [diff] [blame] | 167 | lm96000_update(dev, LM96000_ZONE_HYSTERESIS(zone), |
| 168 | LM96000_ZONE_HYST_MASK(zone), |
| 169 | config->hysteresis << LM96000_ZONE_HYST_SHIFT(zone) |
| 170 | & LM96000_ZONE_HYST_MASK(zone)); |
Nico Huber | ffea237 | 2017-08-24 23:30:44 +0200 | [diff] [blame] | 171 | } |
| 172 | |
| 173 | static void lm96000_init(struct device *const dev) |
| 174 | { |
| 175 | const struct drivers_i2c_lm96000_config *const config = dev->chip_info; |
Nico Huber | 9a940bf | 2019-05-20 14:13:12 +0200 | [diff] [blame] | 176 | unsigned int i; |
| 177 | int lm_config; |
Nico Huber | ffea237 | 2017-08-24 23:30:44 +0200 | [diff] [blame] | 178 | struct stopwatch sw; |
| 179 | |
| 180 | printk(BIOS_DEBUG, "lm96000: Initialization hardware monitoring.\n"); |
| 181 | |
| 182 | stopwatch_init_msecs_expire(&sw, 1000); |
| 183 | lm_config = lm96000_read(dev, LM96000_CONFIG); |
Nico Huber | 9a940bf | 2019-05-20 14:13:12 +0200 | [diff] [blame] | 184 | while ((lm_config < 0 || !((unsigned int)lm_config & LM96000_READY))) { |
Nico Huber | ffea237 | 2017-08-24 23:30:44 +0200 | [diff] [blame] | 185 | mdelay(1); |
| 186 | lm_config = lm96000_read(dev, LM96000_CONFIG); |
| 187 | if (stopwatch_expired(&sw)) |
| 188 | break; |
| 189 | } |
Nico Huber | 9a940bf | 2019-05-20 14:13:12 +0200 | [diff] [blame] | 190 | if (lm_config < 0 || !((unsigned int)lm_config & LM96000_READY)) { |
Nico Huber | ffea237 | 2017-08-24 23:30:44 +0200 | [diff] [blame] | 191 | printk(BIOS_INFO, "lm96000: Not ready after 1s.\n"); |
| 192 | return; |
| 193 | } |
| 194 | |
| 195 | lm96000_set_vin_limits(dev, config); |
| 196 | lm96000_set_temp_limits(dev, config); |
| 197 | lm96000_set_fan_limits(dev, config); |
| 198 | for (i = 0; i < LM96000_PWM_CTL_CNT; ++i) { |
| 199 | if (config->fan[i].mode != LM96000_FAN_IGNORE) |
| 200 | lm96000_configure_pwm(dev, i, config->fan + i); |
| 201 | } |
| 202 | for (i = 0; i < LM96000_TEMP_ZONE_CNT; ++i) |
| 203 | lm96000_configure_temp_zone(dev, i, config->zone + i); |
| 204 | lm96000_update(dev, LM96000_CONFIG, 0, LM96000_START); |
| 205 | } |
| 206 | |
| 207 | static struct device_operations lm96000_ops = { |
| 208 | .read_resources = DEVICE_NOOP, |
| 209 | .set_resources = DEVICE_NOOP, |
Nico Huber | ffea237 | 2017-08-24 23:30:44 +0200 | [diff] [blame] | 210 | .init = lm96000_init, |
| 211 | }; |
| 212 | |
| 213 | static void lm96000_enable(struct device *const dev) |
| 214 | { |
| 215 | dev->ops = &lm96000_ops; |
| 216 | } |
| 217 | |
| 218 | struct chip_operations drivers_i2c_lm96000_ops = { |
| 219 | CHIP_NAME("LM96000") |
| 220 | .enable_dev = lm96000_enable |
| 221 | }; |