usb: chipidea: add support for roles

Add some generic code for roles and implement simple role switching
based on ID pin state and/or a sysfs file. At this, we also rename
the device to ci_hdrc, which is what it is.

The "manual" switch is made into a sysfs file and not debugfs, because
it might be useful even in non-debug context. For some boards, like
sheevaplug, it seems to be the only way to switch roles without modifying
the hardware, since the ID pin is always grounded.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 18 insertions, 0 deletions

diff --git a/drivers/usb/chipidea/bits.h b/drivers/usb/chipidea/bits.h
index 5fbff11cf220..62c35af1a5af 100644
--- a/drivers/usb/chipidea/bits.h
+++ b/drivers/usb/chipidea/bits.h
@@ -50,6 +50,24 @@
 #define DEVLC_PSPD            (0x03UL << 25)
 #define    DEVLC_PSPD_HS      (0x02UL << 25)
 
+/* OTGSC */
+#define OTGSC_IDPU            BIT(5)
+#define OTGSC_ID              BIT(8)
+#define OTGSC_AVV             BIT(9)
+#define OTGSC_ASV             BIT(10)
+#define OTGSC_BSV             BIT(11)
+#define OTGSC_BSE             BIT(12)
+#define OTGSC_IDIS            BIT(16)
+#define OTGSC_AVVIS           BIT(17)
+#define OTGSC_ASVIS           BIT(18)
+#define OTGSC_BSVIS           BIT(19)
+#define OTGSC_BSEIS           BIT(20)
+#define OTGSC_IDIE            BIT(24)
+#define OTGSC_AVVIE           BIT(25)
+#define OTGSC_ASVIE           BIT(26)
+#define OTGSC_BSVIE           BIT(27)
+#define OTGSC_BSEIE           BIT(28)
+
 /* USBMODE */
 #define USBMODE_CM            (0x03UL <<  0)
 #define    USBMODE_CM_IDLE    (0x00UL <<  0)