ACPI: throttle: Change internal APIs better handle _PTC

Change the function interface for throttling control via PTC.
The following functions are concerned:

acpi_read_throttling_status()
acpi_write_throttling_state()
acpi_get_throttling_value()
acpi_get_throttling_state()

Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
Signed-off-by: Li Shaohua <shaohua.li@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

diff --git a/drivers/acpi/processor_throttling.c b/drivers/acpi/processor_throttling.c
index 20d82f5..5c96ef1 100644 (file)
--- a/drivers/acpi/processor_throttling.c
+++ b/drivers/acpi/processor_throttling.c
@@ -376,16 +376,23 @@ static int acpi_processor_get_throttling_fadt(struct acpi_processor *pr)
        return 0;
 }
 
-static int acpi_read_throttling_status(struct acpi_processor_throttling
-                                      *throttling)
+static int acpi_read_throttling_status(struct acpi_processor *pr,
+                                       acpi_integer *value)
 {
-       int value = -1;
+       u64 ptc_value;
+       struct acpi_processor_throttling *throttling;
+       int ret = -1;
+
+       throttling = &pr->throttling;
        switch (throttling->status_register.space_id) {
        case ACPI_ADR_SPACE_SYSTEM_IO:
+               ptc_value = 0;
                acpi_os_read_port((acpi_io_address) throttling->status_register.
-                                 address, &value,
+                                 address, (u32 *) &ptc_value,
                                  (u32) throttling->status_register.bit_width *
                                  8);
+               *value = (acpi_integer) ptc_value;
+               ret = 0;
                break;
        case ACPI_ADR_SPACE_FIXED_HARDWARE:
                printk(KERN_ERR PREFIX
@@ -395,18 +402,22 @@ static int acpi_read_throttling_status(struct acpi_processor_throttling
                printk(KERN_ERR PREFIX "Unknown addr space %d\n",
                       (u32) (throttling->status_register.space_id));
        }
-       return value;
+       return ret;
 }
 
-static int acpi_write_throttling_state(struct acpi_processor_throttling
-                                      *throttling, int value)
+static int acpi_write_throttling_state(struct acpi_processor *pr,
+                               acpi_integer value)
 {
+       u64 ptc_value;
+       struct acpi_processor_throttling *throttling;
        int ret = -1;
 
+       throttling = &pr->throttling;
        switch (throttling->control_register.space_id) {
        case ACPI_ADR_SPACE_SYSTEM_IO:
+               ptc_value = value;
                acpi_os_write_port((acpi_io_address) throttling->
-                                  control_register.address, value,
+                                  control_register.address, (u32) ptc_value,
                                   (u32) throttling->control_register.
                                   bit_width * 8);
                ret = 0;
@@ -422,7 +433,8 @@ static int acpi_write_throttling_state(struct acpi_processor_throttling
        return ret;
 }
 
-static int acpi_get_throttling_state(struct acpi_processor *pr, int value)
+static int acpi_get_throttling_state(struct acpi_processor *pr,
+                               acpi_integer value)
 {
        int i;
 
@@ -438,22 +450,26 @@ static int acpi_get_throttling_state(struct acpi_processor *pr, int value)
        return i;
 }
 
-static int acpi_get_throttling_value(struct acpi_processor *pr, int state)
+static int acpi_get_throttling_value(struct acpi_processor *pr,
+                       int state, acpi_integer *value)
 {
-       int value = -1;
+       int ret = -1;
+
        if (state >= 0 && state <= pr->throttling.state_count) {
                struct acpi_processor_tx_tss *tx =
                    (struct acpi_processor_tx_tss *)&(pr->throttling.
                                                      states_tss[state]);
-               value = tx->control;
+               *value = tx->control;
+               ret = 0;
        }
-       return value;
+       return ret;
 }
 
 static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr)
 {
        int state = 0;
-       u32 value = 0;
+       int ret;
+       acpi_integer value;
 
        if (!pr)
                return -EINVAL;
@@ -463,8 +479,9 @@ static int acpi_processor_get_throttling_ptc(struct acpi_processor *pr)
 
        pr->throttling.state = 0;
        local_irq_disable();
-       value = acpi_read_throttling_status(&pr->throttling);
-       if (value >= 0) {
+       value = 0;
+       ret = acpi_read_throttling_status(pr, &value);
+       if (ret >= 0) {
                state = acpi_get_throttling_state(pr, value);
                pr->throttling.state = state;
        }
@@ -588,7 +605,8 @@ static int acpi_processor_set_throttling_fadt(struct acpi_processor *pr,
 static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr,
                                             int state)
 {
-       u32 value = 0;
+       int ret;
+       acpi_integer value;
 
        if (!pr)
                return -EINVAL;
@@ -606,10 +624,10 @@ static int acpi_processor_set_throttling_ptc(struct acpi_processor *pr,
                return -EPERM;
 
        local_irq_disable();
-
-       value = acpi_get_throttling_value(pr, state);
-       if (value >= 0) {
-               acpi_write_throttling_state(&pr->throttling, value);
+       value = 0;
+       ret = acpi_get_throttling_value(pr, state, &value);
+       if (ret >= 0) {
+               acpi_write_throttling_state(pr, value);
                pr->throttling.state = state;
        }
        local_irq_enable();