Add generic access ops for controllers with a ulpi viewport register
(e.g. Chipidea/ARC based controllers).
Signed-off-by: Benoit Goby <benoit@xxxxxxxxxxx>
---
drivers/usb/otg/Kconfig | 7 ++++
drivers/usb/otg/Makefile | 1 +
drivers/usb/otg/ulpi_viewport.c | 77 +++++++++++++++++++++++++++++++++++++++
include/linux/usb/ulpi.h | 5 +++
4 files changed, 90 insertions(+), 0 deletions(-)
create mode 100644 drivers/usb/otg/ulpi_viewport.c
diff --git a/drivers/usb/otg/Kconfig b/drivers/usb/otg/Kconfig
index 9ffc823..7702ee6 100644
--- a/drivers/usb/otg/Kconfig
+++ b/drivers/usb/otg/Kconfig
@@ -49,6 +49,13 @@ config USB_ULPI
Enable this to support ULPI connected USB OTG transceivers which
are likely found on embedded boards.
+config USB_ULPI_VIEWPORT
+ bool
+ depends on USB_ULPI
+ help
+ Provides read/write operations to the ULPI phy register set for
+ controllers with a viewport register (e.g. Chipidea/ARC controllers).
+
config TWL4030_USB
tristate "TWL4030 USB Transceiver Driver"
depends on TWL4030_CORE && REGULATOR_TWL4030
diff --git a/drivers/usb/otg/Makefile b/drivers/usb/otg/Makefile
index a520e71..44581a9 100644
--- a/drivers/usb/otg/Makefile
+++ b/drivers/usb/otg/Makefile
@@ -16,5 +16,6 @@ obj-$(CONFIG_TWL6030_USB) += twl6030-usb.o
obj-$(CONFIG_USB_LANGWELL_OTG) += langwell_otg.o
obj-$(CONFIG_NOP_USB_XCEIV) += nop-usb-xceiv.o
obj-$(CONFIG_USB_ULPI) += ulpi.o
+obj-$(CONFIG_USB_ULPI_VIEWPORT) += ulpi_viewport.o
obj-$(CONFIG_USB_MSM_OTG_72K) += msm72k_otg.o
obj-$(CONFIG_AB8500_USB) += ab8500-usb.o
diff --git a/drivers/usb/otg/ulpi_viewport.c b/drivers/usb/otg/ulpi_viewport.c
new file mode 100644
index 0000000..dd5dfae2
--- /dev/null
+++ b/drivers/usb/otg/ulpi_viewport.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/usb.h>
+#include <linux/io.h>
+#include <linux/usb/otg.h>
+#include <linux/usb/ulpi.h>
+
+#define ULPI_VIEW_WAKEUP (1 << 31)
+#define ULPI_VIEW_RUN (1 << 30)
+#define ULPI_VIEW_WRITE (1 << 29)
+#define ULPI_VIEW_READ (0 << 29)
+#define ULPI_VIEW_ADDR(x) (((x) & 0xff) << 16)
+#define ULPI_VIEW_DATA_READ(x) (((x) >> 8) & 0xff)
+#define ULPI_VIEW_DATA_WRITE(x) (((x) & 0xff) << 0)
+
+static int ulpi_viewport_wait(void __iomem *view, u32 mask, u32 result)
+{
+ unsigned long usec = 2000;
+
+ while (usec--) {
+ if ((readl(view) & mask) == result)
+ return 0;
+ udelay(1);
+ };
+ return -ETIMEDOUT;
+}
+
+static int ulpi_viewport_read(struct otg_transceiver *otg, u32 reg)
+{
+ int ret;
+ void __iomem *view = otg->io_priv;
+
+ writel(ULPI_VIEW_WAKEUP | ULPI_VIEW_WRITE, view);
+ ret = ulpi_viewport_wait(view, ULPI_VIEW_WAKEUP, 0);
+ if (ret)
+ return ret;
+
+ writel(ULPI_VIEW_RUN | ULPI_VIEW_READ | ULPI_VIEW_ADDR(reg), view);
+ ret = ulpi_viewport_wait(view, ULPI_VIEW_RUN, 0);
+ if (ret)
+ return ret;
+
+ return ULPI_VIEW_DATA_READ(readl(view));
+}
+
+static int ulpi_viewport_write(struct otg_transceiver *otg, u32 val, u32 reg)
+{
+ int ret;
+ void __iomem *view = otg->io_priv;
+
+ writel(ULPI_VIEW_WAKEUP | ULPI_VIEW_WRITE, view);
+ ret = ulpi_viewport_wait(view, ULPI_VIEW_WAKEUP, 0);
+ if (ret)
+ return ret;
+
+ writel(ULPI_VIEW_RUN | ULPI_VIEW_WRITE | ULPI_VIEW_DATA_WRITE(val) |
+ ULPI_VIEW_ADDR(reg), view);
+ return ulpi_viewport_wait(view, ULPI_VIEW_RUN, 0);
+}
+
+struct otg_io_access_ops ulpi_viewport_access_ops = {
+ .read = ulpi_viewport_read,
+ .write = ulpi_viewport_write,
+};
diff --git a/include/linux/usb/ulpi.h b/include/linux/usb/ulpi.h
index 82b1507..9595796 100644
--- a/include/linux/usb/ulpi.h
+++ b/include/linux/usb/ulpi.h
@@ -184,4 +184,9 @@
struct otg_transceiver *otg_ulpi_create(struct otg_io_access_ops *ops,
unsigned int flags);
+#ifdef CONFIG_USB_ULPI_VIEWPORT
+/* access ops for controllers with a viewport register */
+extern struct otg_io_access_ops ulpi_viewport_access_ops;
+#endif
+
#endif /* __LINUX_USB_ULPI_H */
--
1.7.3.1
--
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