[PATCH 1/3] usb: chipidea: Add identification registers access APIs

Sanchayan Maity
2014-12-19T09:55:54Z

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

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>
---
drivers/usb/chipidea/ci.h | 53 +++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 53 insertions(+)

diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h
index ea40626..94db636 100644
--- 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,
@@ -97,6 +106,18 @@ enum ci_role {
CI_ROLE_END,
};

+enum CI_REVISION {
+ CI_REVISION_1X = 10, /* Revision 1.x */
+ CI_REVISION_20 = 20, /* Revision 2.0 */
+ CI_REVISION_21, /* Revision 2.1 */
+ CI_REVISION_22, /* Revision 2.2 */
+ CI_REVISION_23, /* Revision 2.3 */
+ CI_REVISION_24, /* Revision 2.4 */
+ CI_REVISION_25, /* Revision 2.5 */
+ CI_REVISION_25_PLUS, /* Revision above than 2.5 */
+ CI_REVISION_UNKNOWN = 99, /* Unknown Revision */
+};
+
/**
* struct ci_role_driver - host/gadget role driver
* @start: start this role
@@ -168,6 +189,7 @@ struct hw_bank {
* @b_sess_valid_event: indicates there is a vbus event, and handled
* at ci_otg_work
* @imx28_write_fix: Freescale imx28 needs swp instruction for writing
+ * @rev: The revision number for controller
*/
struct ci_hdrc {
struct device *dev;
@@ -207,6 +229,7 @@ struct ci_hdrc {
bool id_event;
bool b_sess_valid_event;
bool imx28_write_fix;
+ enum CI_REVISION rev;
};

static inline struct ci_role_driver *ci_role(struct ci_hdrc *ci)
@@ -244,6 +267,36 @@ 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
--
1.7.9.5