gpio-pch: modify gpio_nums and mask

Currently, the number of GPIO pins is set fixed value(=12).
Also PIN MASK is set as '0xfff'.
However the pins differs by IOH.
This patch sets the value correctly.

Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 25 insertions, 6 deletions

diff --git a/drivers/gpio/gpio-pch.c b/drivers/gpio/gpio-pch.c
index d548069d391..4ac69bd7ad4 100644
--- a/drivers/gpio/gpio-pch.c
+++ b/drivers/gpio/gpio-pch.c
@@ -18,9 +18,6 @@
 #include <linux/pci.h>
 #include <linux/gpio.h>
 
-#define PCH_GPIO_ALL_PINS       0xfff /* Mask for GPIO pins 0 to 11 */
-#define GPIO_NUM_PINS   12      /* Specifies number of GPIO PINS GPIO0-GPIO11 */
-
 struct pch_regs {
         u32     ien;
         u32     istatus;
@@ -37,6 +34,19 @@ struct pch_regs {
         u32     reset;
 };
 
+enum pch_type_t {
+        INTEL_EG20T_PCH,
+        OKISEMI_ML7223m_IOH, /* OKISEMI ML7223 IOH PCIe Bus-m */
+        OKISEMI_ML7223n_IOH  /* OKISEMI ML7223 IOH PCIe Bus-n */
+};
+
+/* Specifies number of GPIO PINS */
+static int gpio_pins[] = {
+        [INTEL_EG20T_PCH] = 12,
+        [OKISEMI_ML7223m_IOH] = 8,
+        [OKISEMI_ML7223n_IOH] = 8,
+};
+
 /**
  * struct pch_gpio_reg_data - The register store data.
  * @po_reg:     To store contents of PO register.
@@ -55,6 +65,7 @@ struct pch_gpio_reg_data {
  * @gpio:                       Data for GPIO infrastructure.
  * @pch_gpio_reg:               Memory mapped Register data is saved here
  *                              when suspend.
+ * @ioh:                IOH ID
  * @spinlock:           Used for register access protection in
  *                              interrupt context pch_irq_mask,
  *                              pch_irq_unmask and pch_irq_type;
@@ -66,6 +77,7 @@ struct pch_gpio {
         struct gpio_chip gpio;
         struct pch_gpio_reg_data pch_gpio_reg;
         struct mutex lock;
+        enum pch_type_t ioh;
         spinlock_t spinlock;
 };
 
@@ -100,7 +112,7 @@ static int pch_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
         u32 reg_val;
 
         mutex_lock(&chip->lock);
-        pm = ioread32(&chip->reg->pm) & PCH_GPIO_ALL_PINS;
+        pm = ioread32(&chip->reg->pm) & ((1 << gpio_pins[chip->ioh]) - 1);
         pm |= (1 << nr);
         iowrite32(pm, &chip->reg->pm);
 
@@ -122,7 +134,7 @@ static int pch_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
         u32 pm;
 
         mutex_lock(&chip->lock);
-        pm = ioread32(&chip->reg->pm) & PCH_GPIO_ALL_PINS; /*bits 0-11*/
+        pm = ioread32(&chip->reg->pm) & ((1 << gpio_pins[chip->ioh]) - 1);
         pm &= ~(1 << nr);
         iowrite32(pm, &chip->reg->pm);
         mutex_unlock(&chip->lock);
@@ -162,7 +174,7 @@ static void pch_gpio_setup(struct pch_gpio *chip)
         gpio->set = pch_gpio_set;
         gpio->dbg_show = NULL;
         gpio->base = -1;
-        gpio->ngpio = GPIO_NUM_PINS;
+        gpio->ngpio = gpio_pins[chip->ioh];
         gpio->can_sleep = 0;
 }
 
@@ -196,6 +208,13 @@ static int __devinit pch_gpio_probe(struct pci_dev *pdev,
                 goto err_iomap;
         }
 
+        if (pdev->device == 0x8803)
+                chip->ioh = INTEL_EG20T_PCH;
+        else if (pdev->device == 0x8014)
+                chip->ioh = OKISEMI_ML7223m_IOH;
+        else if (pdev->device == 0x8043)
+                chip->ioh = OKISEMI_ML7223n_IOH;
+
         chip->reg = chip->base;
         pci_set_drvdata(pdev, chip);
         mutex_init(&chip->lock);