usb: chipidea: add identification registers access APIs

Using hw_write_id_reg and hw_read_id_reg to write and read identification
registers contents, they can be used to get controller information, change
some system configurations, and so on.

Reviewed-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h
index a0aeb8d..e53287a 100644 (file)
--- a/drivers/usb/chipidea/ci.h
+++ b/drivers/usb/chipidea/ci.h
@@ -29,6 +29,15 @@
 /******************************************************************************
  * REGISTERS
  *****************************************************************************/
+/* Identification Registers */
+#define ID_ID                          0x0
+#define ID_HWGENERAL                   0x4
+#define ID_HWHOST                      0x8
+#define ID_HWDEVICE                    0xc
+#define ID_HWTXBUF                     0x10
+#define ID_HWRXBUF                     0x14
+#define ID_SBUSCFG                     0x90
+
 /* register indices */
 enum ci_hw_regs {
        CAP_CAPLENGTH,
@@ -254,6 +263,36 @@ static inline void ci_role_stop(struct ci_hdrc *ci)
 }
 
 /**
+ * hw_read_id_reg: reads from a identification register
+ * @ci: the controller
+ * @offset: offset from the beginning of identification registers region
+ * @mask: bitfield mask
+ *
+ * This function returns register contents
+ */
+static inline u32 hw_read_id_reg(struct ci_hdrc *ci, u32 offset, u32 mask)
+{
+       return ioread32(ci->hw_bank.abs + offset) & mask;
+}
+
+/**
+ * hw_write_id_reg: writes to a identification register
+ * @ci: the controller
+ * @offset: offset from the beginning of identification registers region
+ * @mask: bitfield mask
+ * @data: new value
+ */
+static inline void hw_write_id_reg(struct ci_hdrc *ci, u32 offset,
+                           u32 mask, u32 data)
+{
+       if (~mask)
+               data = (ioread32(ci->hw_bank.abs + offset) & ~mask)
+                       | (data & mask);
+
+       iowrite32(data, ci->hw_bank.abs + offset);
+}
+
+/**
  * hw_read: reads from a hw register
  * @ci: the controller
  * @reg:  register index