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Implement temperature control using peci

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This commit is contained in:
Jeremy Soller 2019-11-17 15:52:44 -07:00
parent f52af3ff87
commit 49e958fc7d
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GPG Key ID: E988B49EE78A7FB1
3 changed files with 100 additions and 3 deletions
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81
src/board/system76/galp3-c/main.c
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@ -49,7 +49,85 @@ void init(void) {
//TODO: INTC, PECI
// PECI information can be found here: https://www.intel.com/content/dam/www/public/us/en/documents/design-guides/core-i7-lga-2011-guide.pdf
// Allow PECI pin to be used
GCR2 |= (1 << 4);
}
// PECI information can be found here: https://www.intel.com/content/dam/www/public/us/en/documents/design-guides/core-i7-lga-2011-guide.pdf
void peci_event(void) {
static volatile uint8_t __xdata __at(0x3000) HOSTAR;
static volatile uint8_t __xdata __at(0x3001) HOCTLR;
static volatile uint8_t __xdata __at(0x3002) HOCMDR;
static volatile uint8_t __xdata __at(0x3003) HOTRADDR;
static volatile uint8_t __xdata __at(0x3004) HOWRLR;
static volatile uint8_t __xdata __at(0x3005) HORDLR;
static volatile uint8_t __xdata __at(0x3006) HOWRDR;
static volatile uint8_t __xdata __at(0x3007) HORDDR;
static volatile uint8_t __xdata __at(0x3008) HOCTL2R;
static volatile uint8_t __xdata __at(0x3009) RWFCSV;
// Wait for completion
while (HOSTAR & 1) {}
// Clear status
HOSTAR = HOSTAR;
// Enable PECI, clearing data fifo's
HOCTLR = (1 << 5) | (1 << 3);
// Set address to default
HOTRADDR = 0x30;
// Set write length
HOWRLR = 1;
// Set read length
HORDLR = 2;
// Set command
HOCMDR = 1;
// Start transaction
HOCTLR |= 1;
// Wait for completion
while (HOSTAR & 1) {}
if (HOSTAR & (1 << 1)) {
// Use result if finished successfully
uint8_t low = HORDDR;
uint8_t high = HORDDR;
int16_t offset = ((int16_t)high << 8) | (int16_t)low;
// Tjunction = 100C for i7-8565U (and probably the same for all WHL-U)
#define T_JUNCTION 10000
int16_t temp = T_JUNCTION + offset;
// Set fan based on temp, adapted from
// https://github.com/pop-os/system76-power/blob/master/src/fan.rs#L218
uint8_t duty = 0;
if (temp >= 9000) {
// 90C = 100%
duty = 255;
} else if (temp >= 8000) {
// 80C = 50%
duty = 128;
} else if (temp >= 7500) {
// 75C = 45%
duty = 115;
} else if (temp >= 6500) {
// 65C = 40%
duty = 102;
} else if (temp >= 5500) {
// 55C = 35%
duty = 90;
} else if (temp >= 4500) {
// 45C = 30%
duty = 77;
}
if (duty != DCR2) {
DCR2 = duty;
printf("PECI offset=%d, temp=%d = %d\n", offset, temp, duty);
}
} else {
// Default to 50% if there is an error
DCR2 = 128;
}
}
void ac_adapter() {
@ -368,6 +446,7 @@ void main(void) {
printf("Hello from System76 EC for %s!\n", xstr(__BOARD__));
for(;;) {
peci_event();
ac_adapter();
power_button();
kbscan_event();

4
src/board/system76/galp3-c/pwm.c
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@ -16,8 +16,8 @@ void pwm_init(void) {
// Set cycle time to 255 + 1
CTR0 = 255;
// Turn on the CPU fan at half blast (temperature control TODO)
DCR2 = 128;
// Turn off CPU fan (temperature control in peci_event)
DCR2 = 0;
// Enable PWM
ZTIER = (1 << 1);

18
src/ec/it8587e/include/ec/gpio.h
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@ -22,6 +22,24 @@ bool gpio_get(struct Gpio * gpio);
void gpio_set(struct Gpio * gpio, bool value);
volatile uint8_t __xdata __at(0x1600) GCR;
volatile uint8_t __xdata __at(0x16F0) GCR1;
volatile uint8_t __xdata __at(0x16F1) GCR2;
volatile uint8_t __xdata __at(0x16F2) GCR3;
volatile uint8_t __xdata __at(0x16F3) GCR4;
volatile uint8_t __xdata __at(0x16F4) GCR5;
volatile uint8_t __xdata __at(0x16F5) GCR6;
volatile uint8_t __xdata __at(0x16F6) GCR7;
volatile uint8_t __xdata __at(0x16F7) GCR8;
volatile uint8_t __xdata __at(0x16F8) GCR9;
volatile uint8_t __xdata __at(0x16F9) GCR10;
volatile uint8_t __xdata __at(0x16FA) GCR11;
volatile uint8_t __xdata __at(0x16FB) GCR12;
volatile uint8_t __xdata __at(0x16FC) GCR13;
volatile uint8_t __xdata __at(0x16FD) GCR14;
volatile uint8_t __xdata __at(0x16FE) GCR15;
volatile uint8_t __xdata __at(0x16E0) GCR16;
volatile uint8_t __xdata __at(0x16E1) GCR17;
volatile uint8_t __xdata __at(0x16E2) GCR18;
volatile uint8_t __xdata __at(0x1601) GPDRA;
volatile uint8_t __xdata __at(0x1602) GPDRB;