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path: root/drivers/macintosh/therm_pm72.c
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Diffstat (limited to 'drivers/macintosh/therm_pm72.c')
-rw-r--r--drivers/macintosh/therm_pm72.c218
1 files changed, 203 insertions, 15 deletions
diff --git a/drivers/macintosh/therm_pm72.c b/drivers/macintosh/therm_pm72.c
index c1fe0b368f76..20bf67244e2c 100644
--- a/drivers/macintosh/therm_pm72.c
+++ b/drivers/macintosh/therm_pm72.c
@@ -95,6 +95,17 @@
95 * - Use min/max macros here or there 95 * - Use min/max macros here or there
96 * - Latest darwin updated U3H min fan speed to 20% PWM 96 * - Latest darwin updated U3H min fan speed to 20% PWM
97 * 97 *
98 * July. 06, 2006 : 1.3
99 * - Fix setting of RPM fans on Xserve G5 (they were going too fast)
100 * - Add missing slots fan control loop for Xserve G5
101 * - Lower fixed slots fan speed from 50% to 40% on desktop G5s. We
102 * still can't properly implement the control loop for these, so let's
103 * reduce the noise a little bit, it appears that 40% still gives us
104 * a pretty good air flow
105 * - Add code to "tickle" the FCU regulary so it doesn't think that
106 * we are gone while in fact, the machine just didn't need any fan
107 * speed change lately
108 *
98 */ 109 */
99 110
100#include <linux/types.h> 111#include <linux/types.h>
@@ -121,7 +132,7 @@
121 132
122#include "therm_pm72.h" 133#include "therm_pm72.h"
123 134
124#define VERSION "1.2b2" 135#define VERSION "1.3"
125 136
126#undef DEBUG 137#undef DEBUG
127 138
@@ -146,6 +157,7 @@ static struct basckside_pid_params backside_params;
146static struct backside_pid_state backside_state; 157static struct backside_pid_state backside_state;
147static struct drives_pid_state drives_state; 158static struct drives_pid_state drives_state;
148static struct dimm_pid_state dimms_state; 159static struct dimm_pid_state dimms_state;
160static struct slots_pid_state slots_state;
149static int state; 161static int state;
150static int cpu_count; 162static int cpu_count;
151static int cpu_pid_type; 163static int cpu_pid_type;
@@ -154,7 +166,8 @@ static struct completion ctrl_complete;
154static int critical_state; 166static int critical_state;
155static int rackmac; 167static int rackmac;
156static s32 dimm_output_clamp; 168static s32 dimm_output_clamp;
157 169static int fcu_rpm_shift;
170static int fcu_tickle_ticks;
158static DECLARE_MUTEX(driver_lock); 171static DECLARE_MUTEX(driver_lock);
159 172
160/* 173/*
@@ -495,13 +508,20 @@ static int start_fcu(void)
495 rc = fan_write_reg(0x2e, &buf, 1); 508 rc = fan_write_reg(0x2e, &buf, 1);
496 if (rc < 0) 509 if (rc < 0)
497 return -EIO; 510 return -EIO;
511 rc = fan_read_reg(0, &buf, 1);
512 if (rc < 0)
513 return -EIO;
514 fcu_rpm_shift = (buf == 1) ? 2 : 3;
515 printk(KERN_DEBUG "FCU Initialized, RPM fan shift is %d\n",
516 fcu_rpm_shift);
517
498 return 0; 518 return 0;
499} 519}
500 520
501static int set_rpm_fan(int fan_index, int rpm) 521static int set_rpm_fan(int fan_index, int rpm)
502{ 522{
503 unsigned char buf[2]; 523 unsigned char buf[2];
504 int rc, id; 524 int rc, id, min, max;
505 525
506 if (fcu_fans[fan_index].type != FCU_FAN_RPM) 526 if (fcu_fans[fan_index].type != FCU_FAN_RPM)
507 return -EINVAL; 527 return -EINVAL;
@@ -509,12 +529,15 @@ static int set_rpm_fan(int fan_index, int rpm)
509 if (id == FCU_FAN_ABSENT_ID) 529 if (id == FCU_FAN_ABSENT_ID)
510 return -EINVAL; 530 return -EINVAL;
511 531
512 if (rpm < 300) 532 min = 2400 >> fcu_rpm_shift;
513 rpm = 300; 533 max = 56000 >> fcu_rpm_shift;
514 else if (rpm > 8191) 534
515 rpm = 8191; 535 if (rpm < min)
516 buf[0] = rpm >> 5; 536 rpm = min;
517 buf[1] = rpm << 3; 537 else if (rpm > max)
538 rpm = max;
539 buf[0] = rpm >> (8 - fcu_rpm_shift);
540 buf[1] = rpm << fcu_rpm_shift;
518 rc = fan_write_reg(0x10 + (id * 2), buf, 2); 541 rc = fan_write_reg(0x10 + (id * 2), buf, 2);
519 if (rc < 0) 542 if (rc < 0)
520 return -EIO; 543 return -EIO;
@@ -551,7 +574,7 @@ static int get_rpm_fan(int fan_index, int programmed)
551 if (rc != 2) 574 if (rc != 2)
552 return -EIO; 575 return -EIO;
553 576
554 return (buf[0] << 5) | buf[1] >> 3; 577 return (buf[0] << (8 - fcu_rpm_shift)) | buf[1] >> fcu_rpm_shift;
555} 578}
556 579
557static int set_pwm_fan(int fan_index, int pwm) 580static int set_pwm_fan(int fan_index, int pwm)
@@ -609,6 +632,26 @@ static int get_pwm_fan(int fan_index)
609 return (buf[0] * 1000) / 2559; 632 return (buf[0] * 1000) / 2559;
610} 633}
611 634
635static void tickle_fcu(void)
636{
637 int pwm;
638
639 pwm = get_pwm_fan(SLOTS_FAN_PWM_INDEX);
640
641 DBG("FCU Tickle, slots fan is: %d\n", pwm);
642 if (pwm < 0)
643 pwm = 100;
644
645 if (!rackmac) {
646 pwm = SLOTS_FAN_DEFAULT_PWM;
647 } else if (pwm < SLOTS_PID_OUTPUT_MIN)
648 pwm = SLOTS_PID_OUTPUT_MIN;
649
650 /* That is hopefully enough to make the FCU happy */
651 set_pwm_fan(SLOTS_FAN_PWM_INDEX, pwm);
652}
653
654
612/* 655/*
613 * Utility routine to read the CPU calibration EEPROM data 656 * Utility routine to read the CPU calibration EEPROM data
614 * from the device-tree 657 * from the device-tree
@@ -715,6 +758,9 @@ BUILD_SHOW_FUNC_INT(backside_fan_pwm, backside_state.pwm)
715BUILD_SHOW_FUNC_FIX(drives_temperature, drives_state.last_temp) 758BUILD_SHOW_FUNC_FIX(drives_temperature, drives_state.last_temp)
716BUILD_SHOW_FUNC_INT(drives_fan_rpm, drives_state.rpm) 759BUILD_SHOW_FUNC_INT(drives_fan_rpm, drives_state.rpm)
717 760
761BUILD_SHOW_FUNC_FIX(slots_temperature, slots_state.last_temp)
762BUILD_SHOW_FUNC_INT(slots_fan_pwm, slots_state.pwm)
763
718BUILD_SHOW_FUNC_FIX(dimms_temperature, dimms_state.last_temp) 764BUILD_SHOW_FUNC_FIX(dimms_temperature, dimms_state.last_temp)
719 765
720static DEVICE_ATTR(cpu0_temperature,S_IRUGO,show_cpu0_temperature,NULL); 766static DEVICE_ATTR(cpu0_temperature,S_IRUGO,show_cpu0_temperature,NULL);
@@ -735,6 +781,9 @@ static DEVICE_ATTR(backside_fan_pwm,S_IRUGO,show_backside_fan_pwm,NULL);
735static DEVICE_ATTR(drives_temperature,S_IRUGO,show_drives_temperature,NULL); 781static DEVICE_ATTR(drives_temperature,S_IRUGO,show_drives_temperature,NULL);
736static DEVICE_ATTR(drives_fan_rpm,S_IRUGO,show_drives_fan_rpm,NULL); 782static DEVICE_ATTR(drives_fan_rpm,S_IRUGO,show_drives_fan_rpm,NULL);
737 783
784static DEVICE_ATTR(slots_temperature,S_IRUGO,show_slots_temperature,NULL);
785static DEVICE_ATTR(slots_fan_pwm,S_IRUGO,show_slots_fan_pwm,NULL);
786
738static DEVICE_ATTR(dimms_temperature,S_IRUGO,show_dimms_temperature,NULL); 787static DEVICE_ATTR(dimms_temperature,S_IRUGO,show_dimms_temperature,NULL);
739 788
740/* 789/*
@@ -1076,6 +1125,9 @@ static void do_monitor_cpu_rack(struct cpu_pid_state *state)
1076 fan_min = dimm_output_clamp; 1125 fan_min = dimm_output_clamp;
1077 fan_min = max(fan_min, (int)state->mpu.rminn_intake_fan); 1126 fan_min = max(fan_min, (int)state->mpu.rminn_intake_fan);
1078 1127
1128 DBG(" CPU min mpu = %d, min dimm = %d\n",
1129 state->mpu.rminn_intake_fan, dimm_output_clamp);
1130
1079 state->rpm = max(state->rpm, (int)fan_min); 1131 state->rpm = max(state->rpm, (int)fan_min);
1080 state->rpm = min(state->rpm, (int)state->mpu.rmaxn_intake_fan); 1132 state->rpm = min(state->rpm, (int)state->mpu.rmaxn_intake_fan);
1081 state->intake_rpm = state->rpm; 1133 state->intake_rpm = state->rpm;
@@ -1374,7 +1426,8 @@ static void do_monitor_drives(struct drives_pid_state *state)
1374 DBG(" current rpm: %d\n", state->rpm); 1426 DBG(" current rpm: %d\n", state->rpm);
1375 1427
1376 /* Get some sensor readings */ 1428 /* Get some sensor readings */
1377 temp = le16_to_cpu(i2c_smbus_read_word_data(state->monitor, DS1775_TEMP)) << 8; 1429 temp = le16_to_cpu(i2c_smbus_read_word_data(state->monitor,
1430 DS1775_TEMP)) << 8;
1378 state->last_temp = temp; 1431 state->last_temp = temp;
1379 DBG(" temp: %d.%03d, target: %d.%03d\n", FIX32TOPRINT(temp), 1432 DBG(" temp: %d.%03d, target: %d.%03d\n", FIX32TOPRINT(temp),
1380 FIX32TOPRINT(DRIVES_PID_INPUT_TARGET)); 1433 FIX32TOPRINT(DRIVES_PID_INPUT_TARGET));
@@ -1575,7 +1628,7 @@ static int init_dimms_state(struct dimm_pid_state *state)
1575} 1628}
1576 1629
1577/* 1630/*
1578 * Dispose of the state data for the drives control loop 1631 * Dispose of the state data for the DIMM control loop
1579 */ 1632 */
1580static void dispose_dimms_state(struct dimm_pid_state *state) 1633static void dispose_dimms_state(struct dimm_pid_state *state)
1581{ 1634{
@@ -1588,6 +1641,127 @@ static void dispose_dimms_state(struct dimm_pid_state *state)
1588 state->monitor = NULL; 1641 state->monitor = NULL;
1589} 1642}
1590 1643
1644/*
1645 * Slots fan control loop
1646 */
1647static void do_monitor_slots(struct slots_pid_state *state)
1648{
1649 s32 temp, integral, derivative;
1650 s64 integ_p, deriv_p, prop_p, sum;
1651 int i, rc;
1652
1653 if (--state->ticks != 0)
1654 return;
1655 state->ticks = SLOTS_PID_INTERVAL;
1656
1657 DBG("slots:\n");
1658
1659 /* Check fan status */
1660 rc = get_pwm_fan(SLOTS_FAN_PWM_INDEX);
1661 if (rc < 0) {
1662 printk(KERN_WARNING "Error %d reading slots fan !\n", rc);
1663 /* XXX What do we do now ? */
1664 } else
1665 state->pwm = rc;
1666 DBG(" current pwm: %d\n", state->pwm);
1667
1668 /* Get some sensor readings */
1669 temp = le16_to_cpu(i2c_smbus_read_word_data(state->monitor,
1670 DS1775_TEMP)) << 8;
1671 state->last_temp = temp;
1672 DBG(" temp: %d.%03d, target: %d.%03d\n", FIX32TOPRINT(temp),
1673 FIX32TOPRINT(SLOTS_PID_INPUT_TARGET));
1674
1675 /* Store temperature and error in history array */
1676 state->cur_sample = (state->cur_sample + 1) % SLOTS_PID_HISTORY_SIZE;
1677 state->sample_history[state->cur_sample] = temp;
1678 state->error_history[state->cur_sample] = temp - SLOTS_PID_INPUT_TARGET;
1679
1680 /* If first loop, fill the history table */
1681 if (state->first) {
1682 for (i = 0; i < (SLOTS_PID_HISTORY_SIZE - 1); i++) {
1683 state->cur_sample = (state->cur_sample + 1) %
1684 SLOTS_PID_HISTORY_SIZE;
1685 state->sample_history[state->cur_sample] = temp;
1686 state->error_history[state->cur_sample] =
1687 temp - SLOTS_PID_INPUT_TARGET;
1688 }
1689 state->first = 0;
1690 }
1691
1692 /* Calculate the integral term */
1693 sum = 0;
1694 integral = 0;
1695 for (i = 0; i < SLOTS_PID_HISTORY_SIZE; i++)
1696 integral += state->error_history[i];
1697 integral *= SLOTS_PID_INTERVAL;
1698 DBG(" integral: %08x\n", integral);
1699 integ_p = ((s64)SLOTS_PID_G_r) * (s64)integral;
1700 DBG(" integ_p: %d\n", (int)(integ_p >> 36));
1701 sum += integ_p;
1702
1703 /* Calculate the derivative term */
1704 derivative = state->error_history[state->cur_sample] -
1705 state->error_history[(state->cur_sample + SLOTS_PID_HISTORY_SIZE - 1)
1706 % SLOTS_PID_HISTORY_SIZE];
1707 derivative /= SLOTS_PID_INTERVAL;
1708 deriv_p = ((s64)SLOTS_PID_G_d) * (s64)derivative;
1709 DBG(" deriv_p: %d\n", (int)(deriv_p >> 36));
1710 sum += deriv_p;
1711
1712 /* Calculate the proportional term */
1713 prop_p = ((s64)SLOTS_PID_G_p) * (s64)(state->error_history[state->cur_sample]);
1714 DBG(" prop_p: %d\n", (int)(prop_p >> 36));
1715 sum += prop_p;
1716
1717 /* Scale sum */
1718 sum >>= 36;
1719
1720 DBG(" sum: %d\n", (int)sum);
1721 state->pwm = (s32)sum;
1722
1723 state->pwm = max(state->pwm, SLOTS_PID_OUTPUT_MIN);
1724 state->pwm = min(state->pwm, SLOTS_PID_OUTPUT_MAX);
1725
1726 DBG("** DRIVES PWM: %d\n", (int)state->pwm);
1727 set_pwm_fan(SLOTS_FAN_PWM_INDEX, state->pwm);
1728}
1729
1730/*
1731 * Initialize the state structure for the slots bay fan control loop
1732 */
1733static int init_slots_state(struct slots_pid_state *state)
1734{
1735 state->ticks = 1;
1736 state->first = 1;
1737 state->pwm = 50;
1738
1739 state->monitor = attach_i2c_chip(XSERVE_SLOTS_LM75, "slots_temp");
1740 if (state->monitor == NULL)
1741 return -ENODEV;
1742
1743 device_create_file(&of_dev->dev, &dev_attr_slots_temperature);
1744 device_create_file(&of_dev->dev, &dev_attr_slots_fan_pwm);
1745
1746 return 0;
1747}
1748
1749/*
1750 * Dispose of the state data for the slots control loop
1751 */
1752static void dispose_slots_state(struct slots_pid_state *state)
1753{
1754 if (state->monitor == NULL)
1755 return;
1756
1757 device_remove_file(&of_dev->dev, &dev_attr_slots_temperature);
1758 device_remove_file(&of_dev->dev, &dev_attr_slots_fan_pwm);
1759
1760 detach_i2c_chip(state->monitor);
1761 state->monitor = NULL;
1762}
1763
1764
1591static int call_critical_overtemp(void) 1765static int call_critical_overtemp(void)
1592{ 1766{
1593 char *argv[] = { critical_overtemp_path, NULL }; 1767 char *argv[] = { critical_overtemp_path, NULL };
@@ -1617,14 +1791,17 @@ static int main_control_loop(void *x)
1617 goto out; 1791 goto out;
1618 } 1792 }
1619 1793
1620 /* Set the PCI fan once for now */ 1794 /* Set the PCI fan once for now on non-RackMac */
1621 set_pwm_fan(SLOTS_FAN_PWM_INDEX, SLOTS_FAN_DEFAULT_PWM); 1795 if (!rackmac)
1796 set_pwm_fan(SLOTS_FAN_PWM_INDEX, SLOTS_FAN_DEFAULT_PWM);
1622 1797
1623 /* Initialize ADCs */ 1798 /* Initialize ADCs */
1624 initialize_adc(&cpu_state[0]); 1799 initialize_adc(&cpu_state[0]);
1625 if (cpu_state[1].monitor != NULL) 1800 if (cpu_state[1].monitor != NULL)
1626 initialize_adc(&cpu_state[1]); 1801 initialize_adc(&cpu_state[1]);
1627 1802
1803 fcu_tickle_ticks = FCU_TICKLE_TICKS;
1804
1628 up(&driver_lock); 1805 up(&driver_lock);
1629 1806
1630 while (state == state_attached) { 1807 while (state == state_attached) {
@@ -1634,6 +1811,12 @@ static int main_control_loop(void *x)
1634 1811
1635 down(&driver_lock); 1812 down(&driver_lock);
1636 1813
1814 /* Tickle the FCU just in case */
1815 if (--fcu_tickle_ticks < 0) {
1816 fcu_tickle_ticks = FCU_TICKLE_TICKS;
1817 tickle_fcu();
1818 }
1819
1637 /* First, we always calculate the new DIMMs state on an Xserve */ 1820 /* First, we always calculate the new DIMMs state on an Xserve */
1638 if (rackmac) 1821 if (rackmac)
1639 do_monitor_dimms(&dimms_state); 1822 do_monitor_dimms(&dimms_state);
@@ -1654,7 +1837,9 @@ static int main_control_loop(void *x)
1654 } 1837 }
1655 /* Then, the rest */ 1838 /* Then, the rest */
1656 do_monitor_backside(&backside_state); 1839 do_monitor_backside(&backside_state);
1657 if (!rackmac) 1840 if (rackmac)
1841 do_monitor_slots(&slots_state);
1842 else
1658 do_monitor_drives(&drives_state); 1843 do_monitor_drives(&drives_state);
1659 up(&driver_lock); 1844 up(&driver_lock);
1660 1845
@@ -1696,6 +1881,7 @@ static void dispose_control_loops(void)
1696 dispose_cpu_state(&cpu_state[1]); 1881 dispose_cpu_state(&cpu_state[1]);
1697 dispose_backside_state(&backside_state); 1882 dispose_backside_state(&backside_state);
1698 dispose_drives_state(&drives_state); 1883 dispose_drives_state(&drives_state);
1884 dispose_slots_state(&slots_state);
1699 dispose_dimms_state(&dimms_state); 1885 dispose_dimms_state(&dimms_state);
1700} 1886}
1701 1887
@@ -1745,6 +1931,8 @@ static int create_control_loops(void)
1745 goto fail; 1931 goto fail;
1746 if (rackmac && init_dimms_state(&dimms_state)) 1932 if (rackmac && init_dimms_state(&dimms_state))
1747 goto fail; 1933 goto fail;
1934 if (rackmac && init_slots_state(&slots_state))
1935 goto fail;
1748 if (!rackmac && init_drives_state(&drives_state)) 1936 if (!rackmac && init_drives_state(&drives_state))
1749 goto fail; 1937 goto fail;
1750 1938