Michael Niewöhner | e1e65cb | 2021-12-01 19:09:13 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | |
| 3 | #include <acpi/acpigen.h> |
| 4 | #include <console/console.h> |
| 5 | #include <device/device.h> |
| 6 | #include <device/mmio.h> |
| 7 | |
| 8 | #include "chip.h" |
| 9 | #include "ec.h" |
| 10 | #include "commands.h" |
| 11 | |
| 12 | static bool is_curve_valid(struct ec_clevo_it5570e_fan_curve curve) |
| 13 | { |
| 14 | /* |
| 15 | * Fan curve speeds have to be non-decreasing. |
| 16 | * Fan curve temperatures have to be increasing (to avoid division by 0). |
| 17 | * This also covers the case when the curve is all zeroes (i.e. not configured). |
| 18 | */ |
| 19 | |
| 20 | for (int i = 1; i < IT5570E_FAN_CURVE_LEN; i++) { |
| 21 | if (curve.speed[i] < curve.speed[i - 1] || |
| 22 | curve.temperature[i] <= curve.temperature[i - 1]) |
| 23 | return false; |
| 24 | } |
| 25 | |
| 26 | return true; |
| 27 | } |
| 28 | |
| 29 | static void write_fan_curve(struct ec_clevo_it5570e_fan_curve curve, int fan) |
| 30 | { |
| 31 | uint16_t ramp; |
| 32 | char fieldname[5]; |
| 33 | |
| 34 | /* Curve points */ |
| 35 | for (int i = 0; i < IT5570E_FAN_CURVE_LEN; i++) { |
| 36 | snprintf(fieldname, 5, "F%dT%d", fan + 1, i + 1); |
| 37 | acpigen_write_store_int_to_namestr(curve.temperature[i], fieldname); |
| 38 | snprintf(fieldname, 5, "F%dD%d", fan + 1, i + 1); |
| 39 | acpigen_write_store_int_to_namestr(curve.speed[i] * 255 / 100, fieldname); |
| 40 | } |
| 41 | |
| 42 | /* Ramps */ |
| 43 | for (int i = 0; i < (IT5570E_FAN_CURVE_LEN - 1); i++) { |
| 44 | ramp = 255 * 16 * |
| 45 | (curve.speed[i + 1] - curve.speed[i]) / |
| 46 | (curve.temperature[i + 1] - curve.temperature[i]) / |
| 47 | 100; |
| 48 | |
| 49 | snprintf(fieldname, 5, "F%dR%d", fan + 1, i + 1); |
| 50 | acpigen_write_store_int_to_namestr(ramp, fieldname); |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | static void write_fan_opregion(int fan_cnt) |
| 55 | { |
| 56 | char fieldname[5]; |
| 57 | uint8_t flags = FIELD_ANYACC | FIELD_LOCK | FIELD_PRESERVE; |
| 58 | struct opregion opreg = { |
| 59 | .name = "FNCV", |
| 60 | .regionspace = SYSTEMMEMORY, |
| 61 | .regionoffset = CONFIG_EC_CLEVO_IT5570E_MEM_BASE + 0x38c, |
| 62 | .regionlen = fan_cnt * 14, |
| 63 | }; |
| 64 | |
| 65 | acpigen_write_opregion(&opreg); |
| 66 | acpigen_emit_ext_op(FIELD_OP); |
| 67 | acpigen_write_len_f(); |
| 68 | acpigen_emit_namestring(opreg.name); |
| 69 | acpigen_emit_byte(flags); |
| 70 | |
| 71 | for (int fan = 1; fan <= fan_cnt; fan++) { |
| 72 | /* temps */ |
| 73 | for (int i = 1; i <= IT5570E_FAN_CURVE_LEN; i++) { |
| 74 | snprintf(fieldname, 5, "F%dT%d", fan, i); |
| 75 | acpigen_write_field_name(fieldname, 8); |
| 76 | } |
| 77 | |
| 78 | /* duties */ |
| 79 | for (int i = 1; i <= IT5570E_FAN_CURVE_LEN; i++) { |
| 80 | snprintf(fieldname, 5, "F%dD%d", fan, i); |
| 81 | acpigen_write_field_name(fieldname, 8); |
| 82 | } |
| 83 | |
| 84 | /* ramps */ |
| 85 | for (int i = 1; i < IT5570E_FAN_CURVE_LEN; i++) { |
| 86 | snprintf(fieldname, 5, "F%dR%d", fan, i); |
| 87 | acpigen_write_field_name(fieldname, 16); |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | acpigen_pop_len(); /* Field */ |
| 92 | } |
| 93 | |
| 94 | /* |
| 95 | * Set Fan curve |
| 96 | * The function must exist even if the fan curve isn't enabled in devicetree. |
| 97 | */ |
| 98 | void ec_fan_curve_fill_ssdt(const struct device *dev) |
| 99 | { |
| 100 | const ec_config_t *config = config_of(dev); |
| 101 | const int fan_cnt = read8p(ECRAM + FANC); |
| 102 | |
| 103 | acpigen_write_scope(acpi_device_path(dev)); |
| 104 | write_fan_opregion(fan_cnt); |
| 105 | acpigen_write_method("SFCV", 0); |
| 106 | |
| 107 | if (config->fan_mode == FAN_MODE_CUSTOM) { |
| 108 | int curve_cnt = 0; |
| 109 | |
| 110 | /* Check curve count against fan count from EC */ |
| 111 | for (int i = 0; i < IT5570E_MAX_FAN_CNT; i++) |
| 112 | if (*config->fan_curves[i].speed && *config->fan_curves[i].temperature) |
| 113 | curve_cnt++; |
| 114 | |
| 115 | if (curve_cnt != fan_cnt) { |
| 116 | printk(BIOS_WARNING, |
| 117 | "EC: Fan curve count (%d) does not match fan count (%d). " |
| 118 | "Check your devicetree!\n", curve_cnt, fan_cnt); |
| 119 | goto pop; |
| 120 | } |
| 121 | |
| 122 | /* |
| 123 | * Check all curves. |
| 124 | * Custom mode can only be enabled for all fans or none. Thus, all |
| 125 | * custom curves must be valid before custom mode can be enabled. |
| 126 | */ |
| 127 | bool error = false; |
| 128 | for (int i = 0; i < fan_cnt; i++) { |
| 129 | if (!is_curve_valid(config->fan_curves[i])) { |
| 130 | printk(BIOS_ERR, |
| 131 | "EC: Fan %d curve invalid. Check your devicetree!\n", i); |
| 132 | error = true; |
| 133 | } |
| 134 | } |
| 135 | if (error) |
| 136 | goto pop; |
| 137 | |
| 138 | acpigen_write_debug_string("EC: Apply custom fan curve"); |
| 139 | |
| 140 | for (int i = 0; i < fan_cnt; i++) |
| 141 | write_fan_curve(config->fan_curves[i], i); |
| 142 | |
| 143 | /* Enable custom fan mode */ |
| 144 | acpigen_write_store_int_to_namestr(0x04, "FDAT"); |
| 145 | acpigen_emit_namestring("SFCC"); |
| 146 | acpigen_write_integer(0xd7); |
| 147 | } |
| 148 | |
| 149 | pop: |
| 150 | acpigen_pop_len(); /* Method */ |
| 151 | acpigen_pop_len(); /* Scope */ |
| 152 | } |