Consolidating similar algorithms into common functions to make
GPIO SCH simpler and manageable.
Signed-off-by: Chang Rebecca Swee Fun <rebecca.swee.fun.ch...@intel.com>
Reviewed-by: Mika Westerberg <mika.westerb...@linux.intel.com>
Reviewed-by: Alexandre Courbot <acour...@nvidia.com>
---
drivers/gpio/gpio-sch.c | 81 +++++++++++++++++--------------------------------
1 file changed, 28 insertions(+), 53 deletions(-)
diff --git a/drivers/gpio/gpio-sch.c b/drivers/gpio/gpio-sch.c
index 99720c8..054a8ea 100644
--- a/drivers/gpio/gpio-sch.c
+++ b/drivers/gpio/gpio-sch.c
@@ -63,75 +63,59 @@ static unsigned sch_gpio_bit(struct sch_gpio *sch, unsigned
gpio)
return gpio % 8;
}
-static void sch_gpio_enable(struct sch_gpio *sch, unsigned gpio)
+static int sch_gpio_reg_get(struct gpio_chip *gc, unsigned gpio, unsigned reg)
{
+ struct sch_gpio *sch = to_sch_gpio(gc);
unsigned short offset, bit;
- u8 enable;
-
- spin_lock(&sch->lock);
+ u8 reg_val;
- offset = sch_gpio_offset(sch, gpio, GEN);
+ offset = sch_gpio_offset(sch, gpio, reg);
bit = sch_gpio_bit(sch, gpio);
- enable = inb(sch->iobase + offset);
- if (!(enable & (1 << bit)))
- outb(enable | (1 << bit), sch->iobase + offset);
+ reg_val = !!(inb(sch->iobase + offset) & BIT(bit));
- spin_unlock(&sch->lock);
+ return reg_val;
}
-static int sch_gpio_direction_in(struct gpio_chip *gc, unsigned gpio_num)
+static void sch_gpio_reg_set(struct gpio_chip *gc, unsigned gpio, unsigned reg,
+ int val)
{
struct sch_gpio *sch = to_sch_gpio(gc);
- u8 curr_dirs;
unsigned short offset, bit;
+ u8 reg_val;
- spin_lock(&sch->lock);
+ offset = sch_gpio_offset(sch, gpio, reg);
+ bit = sch_gpio_bit(sch, gpio);
- offset = sch_gpio_offset(sch, gpio_num, GIO);
- bit = sch_gpio_bit(sch, gpio_num);
+ reg_val = inb(sch->iobase + offset);
- curr_dirs = inb(sch->iobase + offset);
+ if (val)
+ outb(reg_val | BIT(bit), sch->iobase + offset);
+ else
+ outb((reg_val & ~BIT(bit)), sch->iobase + offset);
+}
- if (!(curr_dirs & (1 << bit)))
- outb(curr_dirs | (1 << bit), sch->iobase + offset);
+static int sch_gpio_direction_in(struct gpio_chip *gc, unsigned gpio_num)
+{
+ struct sch_gpio *sch = to_sch_gpio(gc);
+ spin_lock(&sch->lock);
+ sch_gpio_reg_set(sch, gpio_num, GIO, 1);
spin_unlock(&sch->lock);
return 0;
}
static int sch_gpio_get(struct gpio_chip *gc, unsigned gpio_num)
{
- struct sch_gpio *sch = to_sch_gpio(gc);
- int res;
- unsigned short offset, bit;
-
- offset = sch_gpio_offset(sch, gpio_num, GLV);
- bit = sch_gpio_bit(sch, gpio_num);
-
- res = !!(inb(sch->iobase + offset) & (1 << bit));
-
- return res;
+ return sch_gpio_reg_get(gc, gpio_num, GLV);
}
static void sch_gpio_set(struct gpio_chip *gc, unsigned gpio_num, int val)
{
struct sch_gpio *sch = to_sch_gpio(gc);
- u8 curr_vals;
- unsigned short offset, bit;
spin_lock(&sch->lock);
-
- offset = sch_gpio_offset(sch, gpio_num, GLV);
- bit = sch_gpio_bit(sch, gpio_num);
-
- curr_vals = inb(sch->iobase + offset);
-
- if (val)
- outb(curr_vals | (1 << bit), sch->iobase + offset);
- else
- outb((curr_vals & ~(1 << bit)), sch->iobase + offset);
-
+ sch_gpio_reg_set(gc, gpio_num, GLV, val);
spin_unlock(&sch->lock);
}
@@ -139,18 +123,9 @@ static int sch_gpio_direction_out(struct gpio_chip *gc,
unsigned gpio_num,
int val)
{
struct sch_gpio *sch = to_sch_gpio(gc);
- u8 curr_dirs;
- unsigned short offset, bit;
spin_lock(&sch->lock);
-
- offset = sch_gpio_offset(sch, gpio_num, GIO);
- bit = sch_gpio_bit(sch, gpio_num);
-
- curr_dirs = inb(sch->iobase + offset);
- if (curr_dirs & (1 << bit))
- outb(curr_dirs & ~(1 << bit), sch->iobase + offset);
-
+ sch_gpio_reg_set(sch, gpio_num, GIO, 0);
spin_unlock(&sch->lock);
/*
@@ -209,13 +184,13 @@ static int sch_gpio_probe(struct platform_device *pdev)
* GPIO7 is configured by the CMC as SLPIOVR
* Enable GPIO[9:8] core powered gpios explicitly
*/
- sch_gpio_enable(sch, 8);
- sch_gpio_enable(sch, 9);
+ sch_gpio_reg_set(sch, 8, GEN, 1);
+ sch_gpio_reg_set(sch, 9, GEN, 1);
/*
* SUS_GPIO[2:0] enabled by default
* Enable SUS_GPIO3 resume powered gpio explicitly
*/
- sch_gpio_enable(sch, 13);
+ sch_gpio_reg_set(sch, 13, GEN, 1);
break;
case PCI_DEVICE_ID_INTEL_ITC_LPC:
--
1.9.1
--
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