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f1e0addca8
Convert string compares of DT node names to use of_node_name_{eq,prefix}
helpers instead. This removes direct access to the node name pointer.
This changes a single case insensitive node name comparison to case
sensitive for "ata4". This is the only instance of a case insensitive
comparison for all the open coded node name comparisons on powerpc.
Searching the commit history, there doesn't appear to be any reason for
it to be case insensitive.
A couple of open coded iterating thru the child node names are converted
to use for_each_child_of_node() instead.
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
329 lines
8.0 KiB
C
329 lines
8.0 KiB
C
/*
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* Windfarm PowerMac thermal control. SMU based controls
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*
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* (c) Copyright 2005 Benjamin Herrenschmidt, IBM Corp.
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* <benh@kernel.crashing.org>
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*
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* Released under the term of the GNU GPL v2.
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*/
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/wait.h>
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#include <linux/completion.h>
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#include <asm/prom.h>
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#include <asm/machdep.h>
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#include <asm/io.h>
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#include <asm/sections.h>
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#include <asm/smu.h>
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#include "windfarm.h"
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#define VERSION "0.4"
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#undef DEBUG
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#ifdef DEBUG
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#define DBG(args...) printk(args)
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#else
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#define DBG(args...) do { } while(0)
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#endif
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static int smu_supports_new_fans_ops = 1;
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/*
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* SMU fans control object
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*/
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static LIST_HEAD(smu_fans);
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struct smu_fan_control {
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struct list_head link;
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int fan_type; /* 0 = rpm, 1 = pwm */
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u32 reg; /* index in SMU */
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s32 value; /* current value */
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s32 min, max; /* min/max values */
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struct wf_control ctrl;
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};
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#define to_smu_fan(c) container_of(c, struct smu_fan_control, ctrl)
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static int smu_set_fan(int pwm, u8 id, u16 value)
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{
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struct smu_cmd cmd;
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u8 buffer[16];
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DECLARE_COMPLETION_ONSTACK(comp);
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int rc;
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/* Fill SMU command structure */
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cmd.cmd = SMU_CMD_FAN_COMMAND;
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/* The SMU has an "old" and a "new" way of setting the fan speed
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* Unfortunately, I found no reliable way to know which one works
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* on a given machine model. After some investigations it appears
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* that MacOS X just tries the new one, and if it fails fallbacks
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* to the old ones ... Ugh.
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*/
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retry:
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if (smu_supports_new_fans_ops) {
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buffer[0] = 0x30;
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buffer[1] = id;
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*((u16 *)(&buffer[2])) = value;
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cmd.data_len = 4;
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} else {
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if (id > 7)
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return -EINVAL;
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/* Fill argument buffer */
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memset(buffer, 0, 16);
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buffer[0] = pwm ? 0x10 : 0x00;
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buffer[1] = 0x01 << id;
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*((u16 *)&buffer[2 + id * 2]) = value;
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cmd.data_len = 14;
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}
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cmd.reply_len = 16;
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cmd.data_buf = cmd.reply_buf = buffer;
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cmd.status = 0;
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cmd.done = smu_done_complete;
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cmd.misc = ∁
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rc = smu_queue_cmd(&cmd);
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if (rc)
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return rc;
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wait_for_completion(&comp);
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/* Handle fallback (see coment above) */
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if (cmd.status != 0 && smu_supports_new_fans_ops) {
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printk(KERN_WARNING "windfarm: SMU failed new fan command "
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"falling back to old method\n");
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smu_supports_new_fans_ops = 0;
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goto retry;
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}
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return cmd.status;
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}
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static void smu_fan_release(struct wf_control *ct)
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{
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struct smu_fan_control *fct = to_smu_fan(ct);
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kfree(fct);
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}
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static int smu_fan_set(struct wf_control *ct, s32 value)
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{
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struct smu_fan_control *fct = to_smu_fan(ct);
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if (value < fct->min)
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value = fct->min;
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if (value > fct->max)
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value = fct->max;
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fct->value = value;
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return smu_set_fan(fct->fan_type, fct->reg, value);
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}
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static int smu_fan_get(struct wf_control *ct, s32 *value)
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{
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struct smu_fan_control *fct = to_smu_fan(ct);
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*value = fct->value; /* todo: read from SMU */
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return 0;
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}
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static s32 smu_fan_min(struct wf_control *ct)
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{
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struct smu_fan_control *fct = to_smu_fan(ct);
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return fct->min;
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}
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static s32 smu_fan_max(struct wf_control *ct)
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{
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struct smu_fan_control *fct = to_smu_fan(ct);
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return fct->max;
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}
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static const struct wf_control_ops smu_fan_ops = {
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.set_value = smu_fan_set,
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.get_value = smu_fan_get,
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.get_min = smu_fan_min,
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.get_max = smu_fan_max,
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.release = smu_fan_release,
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.owner = THIS_MODULE,
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};
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static struct smu_fan_control *smu_fan_create(struct device_node *node,
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int pwm_fan)
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{
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struct smu_fan_control *fct;
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const s32 *v;
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const u32 *reg;
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const char *l;
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fct = kmalloc(sizeof(struct smu_fan_control), GFP_KERNEL);
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if (fct == NULL)
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return NULL;
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fct->ctrl.ops = &smu_fan_ops;
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l = of_get_property(node, "location", NULL);
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if (l == NULL)
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goto fail;
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fct->fan_type = pwm_fan;
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fct->ctrl.type = pwm_fan ? WF_CONTROL_PWM_FAN : WF_CONTROL_RPM_FAN;
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/* We use the name & location here the same way we do for SMU sensors,
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* see the comment in windfarm_smu_sensors.c. The locations are a bit
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* less consistent here between the iMac and the desktop models, but
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* that is good enough for our needs for now at least.
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*
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* One problem though is that Apple seem to be inconsistent with case
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* and the kernel doesn't have strcasecmp =P
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*/
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fct->ctrl.name = NULL;
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/* Names used on desktop models */
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if (!strcmp(l, "Rear Fan 0") || !strcmp(l, "Rear Fan") ||
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!strcmp(l, "Rear fan 0") || !strcmp(l, "Rear fan") ||
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!strcmp(l, "CPU A EXHAUST"))
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fct->ctrl.name = "cpu-rear-fan-0";
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else if (!strcmp(l, "Rear Fan 1") || !strcmp(l, "Rear fan 1") ||
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!strcmp(l, "CPU B EXHAUST"))
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fct->ctrl.name = "cpu-rear-fan-1";
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else if (!strcmp(l, "Front Fan 0") || !strcmp(l, "Front Fan") ||
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!strcmp(l, "Front fan 0") || !strcmp(l, "Front fan") ||
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!strcmp(l, "CPU A INTAKE"))
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fct->ctrl.name = "cpu-front-fan-0";
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else if (!strcmp(l, "Front Fan 1") || !strcmp(l, "Front fan 1") ||
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!strcmp(l, "CPU B INTAKE"))
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fct->ctrl.name = "cpu-front-fan-1";
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else if (!strcmp(l, "CPU A PUMP"))
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fct->ctrl.name = "cpu-pump-0";
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else if (!strcmp(l, "CPU B PUMP"))
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fct->ctrl.name = "cpu-pump-1";
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else if (!strcmp(l, "Slots Fan") || !strcmp(l, "Slots fan") ||
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!strcmp(l, "EXPANSION SLOTS INTAKE"))
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fct->ctrl.name = "slots-fan";
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else if (!strcmp(l, "Drive Bay") || !strcmp(l, "Drive bay") ||
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!strcmp(l, "DRIVE BAY A INTAKE"))
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fct->ctrl.name = "drive-bay-fan";
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else if (!strcmp(l, "BACKSIDE"))
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fct->ctrl.name = "backside-fan";
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/* Names used on iMac models */
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if (!strcmp(l, "System Fan") || !strcmp(l, "System fan"))
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fct->ctrl.name = "system-fan";
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else if (!strcmp(l, "CPU Fan") || !strcmp(l, "CPU fan"))
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fct->ctrl.name = "cpu-fan";
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else if (!strcmp(l, "Hard Drive") || !strcmp(l, "Hard drive"))
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fct->ctrl.name = "drive-bay-fan";
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else if (!strcmp(l, "HDD Fan")) /* seen on iMac G5 iSight */
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fct->ctrl.name = "hard-drive-fan";
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else if (!strcmp(l, "ODD Fan")) /* same */
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fct->ctrl.name = "optical-drive-fan";
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/* Unrecognized fan, bail out */
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if (fct->ctrl.name == NULL)
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goto fail;
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/* Get min & max values*/
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v = of_get_property(node, "min-value", NULL);
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if (v == NULL)
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goto fail;
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fct->min = *v;
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v = of_get_property(node, "max-value", NULL);
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if (v == NULL)
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goto fail;
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fct->max = *v;
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/* Get "reg" value */
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reg = of_get_property(node, "reg", NULL);
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if (reg == NULL)
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goto fail;
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fct->reg = *reg;
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if (wf_register_control(&fct->ctrl))
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goto fail;
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return fct;
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fail:
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kfree(fct);
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return NULL;
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}
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static int __init smu_controls_init(void)
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{
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struct device_node *smu, *fans, *fan;
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if (!smu_present())
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return -ENODEV;
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smu = of_find_node_by_type(NULL, "smu");
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if (smu == NULL)
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return -ENODEV;
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/* Look for RPM fans */
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for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
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if (of_node_name_eq(fans, "rpm-fans") ||
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of_device_is_compatible(fans, "smu-rpm-fans"))
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break;
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for (fan = NULL;
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fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
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struct smu_fan_control *fct;
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fct = smu_fan_create(fan, 0);
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if (fct == NULL) {
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printk(KERN_WARNING "windfarm: Failed to create SMU "
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"RPM fan %pOFn\n", fan);
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continue;
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}
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list_add(&fct->link, &smu_fans);
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}
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of_node_put(fans);
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/* Look for PWM fans */
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for (fans = NULL; (fans = of_get_next_child(smu, fans)) != NULL;)
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if (of_node_name_eq(fans, "pwm-fans"))
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break;
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for (fan = NULL;
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fans && (fan = of_get_next_child(fans, fan)) != NULL;) {
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struct smu_fan_control *fct;
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fct = smu_fan_create(fan, 1);
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if (fct == NULL) {
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printk(KERN_WARNING "windfarm: Failed to create SMU "
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"PWM fan %pOFn\n", fan);
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continue;
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}
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list_add(&fct->link, &smu_fans);
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}
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of_node_put(fans);
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of_node_put(smu);
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return 0;
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}
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static void __exit smu_controls_exit(void)
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{
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struct smu_fan_control *fct;
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while (!list_empty(&smu_fans)) {
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fct = list_entry(smu_fans.next, struct smu_fan_control, link);
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list_del(&fct->link);
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wf_unregister_control(&fct->ctrl);
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}
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}
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module_init(smu_controls_init);
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module_exit(smu_controls_exit);
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MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
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MODULE_DESCRIPTION("SMU control objects for PowerMacs thermal control");
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MODULE_LICENSE("GPL");
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