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path: root/drivers/macintosh/smu.c
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Diffstat (limited to 'drivers/macintosh/smu.c')
-rw-r--r--drivers/macintosh/smu.c221
1 files changed, 135 insertions, 86 deletions
diff --git a/drivers/macintosh/smu.c b/drivers/macintosh/smu.c
index db2ae71d07e..4eab93aa570 100644
--- a/drivers/macintosh/smu.c
+++ b/drivers/macintosh/smu.c
@@ -12,14 +12,13 @@
* - maybe add timeout to commands ?
* - blocking version of time functions
* - polling version of i2c commands (including timer that works with
- * interrutps off)
+ * interrupts off)
* - maybe avoid some data copies with i2c by directly using the smu cmd
* buffer and a lower level internal interface
* - understand SMU -> CPU events and implement reception of them via
* the userland interface
*/
-#include <linux/config.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/device.h>
@@ -33,8 +32,12 @@
#include <linux/completion.h>
#include <linux/miscdevice.h>
#include <linux/delay.h>
-#include <linux/sysdev.h>
#include <linux/poll.h>
+#include <linux/mutex.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/slab.h>
#include <asm/byteorder.h>
#include <asm/io.h>
@@ -43,9 +46,7 @@
#include <asm/pmac_feature.h>
#include <asm/smu.h>
#include <asm/sections.h>
-#include <asm/abs_addr.h>
#include <asm/uaccess.h>
-#include <asm/of_device.h>
#define VERSION "0.7"
#define AUTHOR "(c) 2005 Benjamin Herrenschmidt, IBM Corp."
@@ -72,16 +73,19 @@ struct smu_cmd_buf {
struct smu_device {
spinlock_t lock;
struct device_node *of_node;
- struct of_device *of_dev;
+ struct platform_device *of_dev;
int doorbell; /* doorbell gpio */
u32 __iomem *db_buf; /* doorbell buffer */
- int db_irq;
+ struct device_node *db_node;
+ unsigned int db_irq;
int msg;
- int msg_irq;
+ struct device_node *msg_node;
+ unsigned int msg_irq;
struct smu_cmd_buf *cmd_buf; /* command buffer virtual */
u32 cmd_buf_abs; /* command buffer absolute */
struct list_head cmd_list;
struct smu_cmd *cmd_cur; /* pending command */
+ int broken_nap;
struct list_head cmd_i2c_list;
struct smu_i2c_cmd *cmd_i2c_cur; /* pending i2c command */
struct timer_list i2c_timer;
@@ -91,8 +95,10 @@ struct smu_device {
* I don't think there will ever be more than one SMU, so
* for now, just hard code that
*/
+static DEFINE_MUTEX(smu_mutex);
static struct smu_device *smu;
-static DECLARE_MUTEX(smu_part_access);
+static DEFINE_MUTEX(smu_part_access);
+static int smu_irq_inited;
static void smu_i2c_retry(unsigned long data);
@@ -115,11 +121,7 @@ static void smu_start_cmd(void)
DPRINTK("SMU: starting cmd %x, %d bytes data\n", cmd->cmd,
cmd->data_len);
- DPRINTK("SMU: data buffer: %02x %02x %02x %02x %02x %02x %02x %02x\n",
- ((u8 *)cmd->data_buf)[0], ((u8 *)cmd->data_buf)[1],
- ((u8 *)cmd->data_buf)[2], ((u8 *)cmd->data_buf)[3],
- ((u8 *)cmd->data_buf)[4], ((u8 *)cmd->data_buf)[5],
- ((u8 *)cmd->data_buf)[6], ((u8 *)cmd->data_buf)[7]);
+ DPRINTK("SMU: data buffer: %8ph\n", cmd->data_buf);
/* Fill the SMU command buffer */
smu->cmd_buf->cmd = cmd->cmd;
@@ -131,6 +133,19 @@ static void smu_start_cmd(void)
fend = faddr + smu->cmd_buf->length + 2;
flush_inval_dcache_range(faddr, fend);
+
+ /* We also disable NAP mode for the duration of the command
+ * on U3 based machines.
+ * This is slightly racy as it can be written back to 1 by a sysctl
+ * but that never happens in practice. There seem to be an issue with
+ * U3 based machines such as the iMac G5 where napping for the
+ * whole duration of the command prevents the SMU from fetching it
+ * from memory. This might be related to the strange i2c based
+ * mechanism the SMU uses to access memory.
+ */
+ if (smu->broken_nap)
+ powersave_nap = 0;
+
/* This isn't exactly a DMA mapping here, I suspect
* the SMU is actually communicating with us via i2c to the
* northbridge or the CPU to access RAM.
@@ -142,7 +157,7 @@ static void smu_start_cmd(void)
}
-static irqreturn_t smu_db_intr(int irq, void *arg, struct pt_regs *regs)
+static irqreturn_t smu_db_intr(int irq, void *arg)
{
unsigned long flags;
struct smu_cmd *cmd;
@@ -175,7 +190,7 @@ static irqreturn_t smu_db_intr(int irq, void *arg, struct pt_regs *regs)
/* CPU might have brought back the cache line, so we need
* to flush again before peeking at the SMU response. We
* flush the entire buffer for now as we haven't read the
- * reply lenght (it's only 2 cache lines anyway)
+ * reply length (it's only 2 cache lines anyway)
*/
faddr = (unsigned long)smu->cmd_buf;
flush_inval_dcache_range(faddr, faddr + 256);
@@ -207,6 +222,10 @@ static irqreturn_t smu_db_intr(int irq, void *arg, struct pt_regs *regs)
misc = cmd->misc;
mb();
cmd->status = rc;
+
+ /* Re-enable NAP mode */
+ if (smu->broken_nap)
+ powersave_nap = 1;
bail:
/* Start next command if any */
smu_start_cmd();
@@ -221,7 +240,7 @@ static irqreturn_t smu_db_intr(int irq, void *arg, struct pt_regs *regs)
}
-static irqreturn_t smu_msg_intr(int irq, void *arg, struct pt_regs *regs)
+static irqreturn_t smu_msg_intr(int irq, void *arg)
{
/* I don't quite know what to do with this one, we seem to never
* receive it, so I suspect we have to arm it someway in the SMU
@@ -257,6 +276,10 @@ int smu_queue_cmd(struct smu_cmd *cmd)
smu_start_cmd();
spin_unlock_irqrestore(&smu->lock, flags);
+ /* Workaround for early calls when irq isn't available */
+ if (!smu_irq_inited || smu->db_irq == NO_IRQ)
+ smu_spinwait_cmd(cmd);
+
return 0;
}
EXPORT_SYMBOL(smu_queue_cmd);
@@ -302,7 +325,7 @@ void smu_poll(void)
gpio = pmac_do_feature_call(PMAC_FTR_READ_GPIO, NULL, smu->doorbell);
if ((gpio & 7) == 7)
- smu_db_intr(smu->db_irq, smu, NULL);
+ smu_db_intr(smu->db_irq, smu);
}
EXPORT_SYMBOL(smu_poll);
@@ -447,23 +470,22 @@ EXPORT_SYMBOL(smu_present);
int __init smu_init (void)
{
struct device_node *np;
- u32 *data;
+ const u32 *data;
+ int ret = 0;
np = of_find_node_by_type(NULL, "smu");
if (np == NULL)
return -ENODEV;
- printk(KERN_INFO "SMU driver %s %s\n", VERSION, AUTHOR);
+ printk(KERN_INFO "SMU: Driver %s %s\n", VERSION, AUTHOR);
if (smu_cmdbuf_abs == 0) {
printk(KERN_ERR "SMU: Command buffer not allocated !\n");
- return -EINVAL;
+ ret = -EINVAL;
+ goto fail_np;
}
smu = alloc_bootmem(sizeof(struct smu_device));
- if (smu == NULL)
- return -ENOMEM;
- memset(smu, 0, sizeof(*smu));
spin_lock_init(&smu->lock);
INIT_LIST_HEAD(&smu->cmd_list);
@@ -476,18 +498,19 @@ int __init smu_init (void)
* 32 bits value safely
*/
smu->cmd_buf_abs = (u32)smu_cmdbuf_abs;
- smu->cmd_buf = (struct smu_cmd_buf *)abs_to_virt(smu_cmdbuf_abs);
+ smu->cmd_buf = __va(smu_cmdbuf_abs);
- np = of_find_node_by_name(NULL, "smu-doorbell");
- if (np == NULL) {
+ smu->db_node = of_find_node_by_name(NULL, "smu-doorbell");
+ if (smu->db_node == NULL) {
printk(KERN_ERR "SMU: Can't find doorbell GPIO !\n");
- goto fail;
+ ret = -ENXIO;
+ goto fail_bootmem;
}
- data = (u32 *)get_property(np, "reg", NULL);
+ data = of_get_property(smu->db_node, "reg", NULL);
if (data == NULL) {
- of_node_put(np);
printk(KERN_ERR "SMU: Can't find doorbell GPIO address !\n");
- goto fail;
+ ret = -ENXIO;
+ goto fail_db_node;
}
/* Current setup has one doorbell GPIO that does both doorbell
@@ -497,27 +520,21 @@ int __init smu_init (void)
smu->doorbell = *data;
if (smu->doorbell < 0x50)
smu->doorbell += 0x50;
- if (np->n_intrs > 0)
- smu->db_irq = np->intrs[0].line;
-
- of_node_put(np);
/* Now look for the smu-interrupt GPIO */
do {
- np = of_find_node_by_name(NULL, "smu-interrupt");
- if (np == NULL)
+ smu->msg_node = of_find_node_by_name(NULL, "smu-interrupt");
+ if (smu->msg_node == NULL)
break;
- data = (u32 *)get_property(np, "reg", NULL);
+ data = of_get_property(smu->msg_node, "reg", NULL);
if (data == NULL) {
- of_node_put(np);
+ of_node_put(smu->msg_node);
+ smu->msg_node = NULL;
break;
}
smu->msg = *data;
if (smu->msg < 0x50)
smu->msg += 0x50;
- if (np->n_intrs > 0)
- smu->msg_irq = np->intrs[0].line;
- of_node_put(np);
} while(0);
/* Doorbell buffer is currently hard-coded, I didn't find a proper
@@ -527,16 +544,29 @@ int __init smu_init (void)
smu->db_buf = ioremap(0x8000860c, 0x1000);
if (smu->db_buf == NULL) {
printk(KERN_ERR "SMU: Can't map doorbell buffer pointer !\n");
- goto fail;
+ ret = -ENXIO;
+ goto fail_msg_node;
}
+ /* U3 has an issue with NAP mode when issuing SMU commands */
+ smu->broken_nap = pmac_get_uninorth_variant() < 4;
+ if (smu->broken_nap)
+ printk(KERN_INFO "SMU: using NAP mode workaround\n");
+
sys_ctrler = SYS_CTRLER_SMU;
return 0;
- fail:
+fail_msg_node:
+ if (smu->msg_node)
+ of_node_put(smu->msg_node);
+fail_db_node:
+ of_node_put(smu->db_node);
+fail_bootmem:
+ free_bootmem(__pa(smu), sizeof(struct smu_device));
smu = NULL;
- return -ENXIO;
-
+fail_np:
+ of_node_put(np);
+ return ret;
}
@@ -549,13 +579,26 @@ static int smu_late_init(void)
smu->i2c_timer.function = smu_i2c_retry;
smu->i2c_timer.data = (unsigned long)smu;
+ if (smu->db_node) {
+ smu->db_irq = irq_of_parse_and_map(smu->db_node, 0);
+ if (smu->db_irq == NO_IRQ)
+ printk(KERN_ERR "smu: failed to map irq for node %s\n",
+ smu->db_node->full_name);
+ }
+ if (smu->msg_node) {
+ smu->msg_irq = irq_of_parse_and_map(smu->msg_node, 0);
+ if (smu->msg_irq == NO_IRQ)
+ printk(KERN_ERR "smu: failed to map irq for node %s\n",
+ smu->msg_node->full_name);
+ }
+
/*
* Try to request the interrupts
*/
if (smu->db_irq != NO_IRQ) {
if (request_irq(smu->db_irq, smu_db_intr,
- SA_SHIRQ, "SMU doorbell", smu) < 0) {
+ IRQF_SHARED, "SMU doorbell", smu) < 0) {
printk(KERN_WARNING "SMU: can't "
"request interrupt %d\n",
smu->db_irq);
@@ -565,7 +608,7 @@ static int smu_late_init(void)
if (smu->msg_irq != NO_IRQ) {
if (request_irq(smu->msg_irq, smu_msg_intr,
- SA_SHIRQ, "SMU message", smu) < 0) {
+ IRQF_SHARED, "SMU message", smu) < 0) {
printk(KERN_WARNING "SMU: can't "
"request interrupt %d\n",
smu->msg_irq);
@@ -573,6 +616,7 @@ static int smu_late_init(void)
}
}
+ smu_irq_inited = 1;
return 0;
}
/* This has to be before arch_initcall as the low i2c stuff relies on the
@@ -584,20 +628,19 @@ core_initcall(smu_late_init);
* sysfs visibility
*/
-static void smu_expose_childs(void *unused)
+static void smu_expose_childs(struct work_struct *unused)
{
struct device_node *np;
for (np = NULL; (np = of_get_next_child(smu->of_node, np)) != NULL;)
- if (device_is_compatible(np, "smu-sensors"))
+ if (of_device_is_compatible(np, "smu-sensors"))
of_platform_device_create(np, "smu-sensors",
&smu->of_dev->dev);
}
-static DECLARE_WORK(smu_expose_childs_work, smu_expose_childs, NULL);
+static DECLARE_WORK(smu_expose_childs_work, smu_expose_childs);
-static int smu_platform_probe(struct of_device* dev,
- const struct of_device_id *match)
+static int smu_platform_probe(struct platform_device* dev)
{
if (!smu)
return -ENODEV;
@@ -612,7 +655,7 @@ static int smu_platform_probe(struct of_device* dev,
return 0;
}
-static struct of_device_id smu_platform_match[] =
+static const struct of_device_id smu_platform_match[] =
{
{
.type = "smu",
@@ -620,32 +663,30 @@ static struct of_device_id smu_platform_match[] =
{},
};
-static struct of_platform_driver smu_of_platform_driver =
+static struct platform_driver smu_of_platform_driver =
{
- .name = "smu",
- .match_table = smu_platform_match,
+ .driver = {
+ .name = "smu",
+ .owner = THIS_MODULE,
+ .of_match_table = smu_platform_match,
+ },
.probe = smu_platform_probe,
};
static int __init smu_init_sysfs(void)
{
- int rc;
-
/*
- * Due to sysfs bogosity, a sysdev is not a real device, so
- * we should in fact create both if we want sysdev semantics
- * for power management.
* For now, we don't power manage machines with an SMU chip,
* I'm a bit too far from figuring out how that works with those
* new chipsets, but that will come back and bite us
*/
- rc = of_register_driver(&smu_of_platform_driver);
+ platform_driver_register(&smu_of_platform_driver);
return 0;
}
device_initcall(smu_init_sysfs);
-struct of_device *smu_get_ofdev(void)
+struct platform_device *smu_get_ofdev(void)
{
if (!smu)
return NULL;
@@ -746,6 +787,11 @@ static void smu_i2c_low_completion(struct smu_cmd *scmd, void *misc)
if (fail && --cmd->retries > 0) {
DPRINTK("SMU: i2c failure, starting timer...\n");
BUG_ON(cmd != smu->cmd_i2c_cur);
+ if (!smu_irq_inited) {
+ mdelay(5);
+ smu_i2c_retry(0);
+ return;
+ }
mod_timer(&smu->i2c_timer, jiffies + msecs_to_jiffies(5));
return;
}
@@ -851,7 +897,7 @@ int smu_queue_i2c(struct smu_i2c_cmd *cmd)
static int smu_read_datablock(u8 *dest, unsigned int addr, unsigned int len)
{
- DECLARE_COMPLETION(comp);
+ DECLARE_COMPLETION_ONSTACK(comp);
unsigned int chunk;
struct smu_cmd cmd;
int rc;
@@ -898,7 +944,7 @@ static int smu_read_datablock(u8 *dest, unsigned int addr, unsigned int len)
static struct smu_sdbp_header *smu_create_sdb_partition(int id)
{
- DECLARE_COMPLETION(comp);
+ DECLARE_COMPLETION_ONSTACK(comp);
struct smu_simple_cmd cmd;
unsigned int addr, len, tlen;
struct smu_sdbp_header *hdr;
@@ -925,14 +971,14 @@ static struct smu_sdbp_header *smu_create_sdb_partition(int id)
*/
tlen = sizeof(struct property) + len + 18;
- prop = kcalloc(tlen, 1, GFP_KERNEL);
+ prop = kzalloc(tlen, GFP_KERNEL);
if (prop == NULL)
return NULL;
hdr = (struct smu_sdbp_header *)(prop + 1);
prop->name = ((char *)prop) + tlen - 18;
sprintf(prop->name, "sdb-partition-%02x", id);
prop->length = len;
- prop->value = (unsigned char *)hdr;
+ prop->value = hdr;
prop->next = NULL;
/* Read the datablock */
@@ -948,7 +994,7 @@ static struct smu_sdbp_header *smu_create_sdb_partition(int id)
"%02x !\n", id, hdr->id);
goto failure;
}
- if (prom_add_property(smu->of_node, prop)) {
+ if (of_add_property(smu->of_node, prop)) {
printk(KERN_DEBUG "SMU: Failed creating sdb-partition-%02x "
"property !\n", id);
goto failure;
@@ -963,11 +1009,11 @@ static struct smu_sdbp_header *smu_create_sdb_partition(int id)
/* Note: Only allowed to return error code in pointers (using ERR_PTR)
* when interruptible is 1
*/
-struct smu_sdbp_header *__smu_get_sdb_partition(int id, unsigned int *size,
- int interruptible)
+const struct smu_sdbp_header *__smu_get_sdb_partition(int id,
+ unsigned int *size, int interruptible)
{
char pname[32];
- struct smu_sdbp_header *part;
+ const struct smu_sdbp_header *part;
if (!smu)
return NULL;
@@ -978,25 +1024,24 @@ struct smu_sdbp_header *__smu_get_sdb_partition(int id, unsigned int *size,
if (interruptible) {
int rc;
- rc = down_interruptible(&smu_part_access);
+ rc = mutex_lock_interruptible(&smu_part_access);
if (rc)
return ERR_PTR(rc);
} else
- down(&smu_part_access);
+ mutex_lock(&smu_part_access);
- part = (struct smu_sdbp_header *)get_property(smu->of_node,
- pname, size);
+ part = of_get_property(smu->of_node, pname, size);
if (part == NULL) {
DPRINTK("trying to extract from SMU ...\n");
part = smu_create_sdb_partition(id);
if (part != NULL && size)
*size = part->len << 2;
}
- up(&smu_part_access);
+ mutex_unlock(&smu_part_access);
return part;
}
-struct smu_sdbp_header *smu_get_sdb_partition(int id, unsigned int *size)
+const struct smu_sdbp_header *smu_get_sdb_partition(int id, unsigned int *size)
{
return __smu_get_sdb_partition(id, size, 0);
}
@@ -1034,18 +1079,19 @@ static int smu_open(struct inode *inode, struct file *file)
struct smu_private *pp;
unsigned long flags;
- pp = kmalloc(sizeof(struct smu_private), GFP_KERNEL);
+ pp = kzalloc(sizeof(struct smu_private), GFP_KERNEL);
if (pp == 0)
return -ENOMEM;
- memset(pp, 0, sizeof(struct smu_private));
spin_lock_init(&pp->lock);
pp->mode = smu_file_commands;
init_waitqueue_head(&pp->wait);
+ mutex_lock(&smu_mutex);
spin_lock_irqsave(&smu_clist_lock, flags);
list_add(&pp->list, &smu_clist);
spin_unlock_irqrestore(&smu_clist_lock, flags);
file->private_data = pp;
+ mutex_unlock(&smu_mutex);
return 0;
}
@@ -1075,7 +1121,7 @@ static ssize_t smu_write(struct file *file, const char __user *buf,
pp->mode = smu_file_events;
return 0;
} else if (hdr.cmdtype == SMU_CMDTYPE_GET_PARTITION) {
- struct smu_sdbp_header *part;
+ const struct smu_sdbp_header *part;
part = __smu_get_sdb_partition(hdr.cmd, NULL, 1);
if (part == NULL)
return -EINVAL;
@@ -1131,8 +1177,10 @@ static ssize_t smu_read_command(struct file *file, struct smu_private *pp,
return -EOVERFLOW;
spin_lock_irqsave(&pp->lock, flags);
if (pp->cmd.status == 1) {
- if (file->f_flags & O_NONBLOCK)
+ if (file->f_flags & O_NONBLOCK) {
+ spin_unlock_irqrestore(&pp->lock, flags);
return -EAGAIN;
+ }
add_wait_queue(&pp->wait, &wait);
for (;;) {
set_current_state(TASK_INTERRUPTIBLE);
@@ -1209,7 +1257,8 @@ static unsigned int smu_fpoll(struct file *file, poll_table *wait)
if (pp->busy && pp->cmd.status != 1)
mask |= POLLIN;
spin_unlock_irqrestore(&pp->lock, flags);
- } if (pp->mode == smu_file_events) {
+ }
+ if (pp->mode == smu_file_events) {
/* Not yet implemented */
}
return mask;
@@ -1240,9 +1289,9 @@ static int smu_release(struct inode *inode, struct file *file)
set_current_state(TASK_UNINTERRUPTIBLE);
if (pp->cmd.status != 1)
break;
- spin_lock_irqsave(&pp->lock, flags);
- schedule();
spin_unlock_irqrestore(&pp->lock, flags);
+ schedule();
+ spin_lock_irqsave(&pp->lock, flags);
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&pp->wait, &wait);
@@ -1258,7 +1307,7 @@ static int smu_release(struct inode *inode, struct file *file)
}
-static struct file_operations smu_device_fops = {
+static const struct file_operations smu_device_fops = {
.llseek = no_llseek,
.read = smu_read,
.write = smu_write,
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-05 18:37:05 +0000