From 5cdf2476690e46c141ed5ad689569b3c37c63594 Mon Sep 17 00:00:00 2001 From: Sanchayan Maity Date: Fri, 19 Dec 2014 15:25:27 +0530 Subject: usb: chipidea: Add identification registers access APIs 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 Signed-off-by: Stefan Agner --- 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 ea40626e0246..94db6365e647 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) @@ -243,6 +266,36 @@ static inline void ci_role_stop(struct ci_hdrc *ci) ci->roles[role]->stop(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 -- cgit v1.2.3