This adds a minimal driver for NXP's ISP1504 transceivers, using the OTG
framework functions recently introduced.
Signed-off-by: Daniel Mack <daniel@xxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxx>
Cc: David Brownell <dbrownell@xxxxxxxxxxxxxxxxxxxxx>
Cc: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
Cc: linux-usb@xxxxxxxxxxxxxxx
---
drivers/usb/Makefile | 2 +
drivers/usb/otg/Kconfig | 6 ++
drivers/usb/otg/Makefile | 1 +
drivers/usb/otg/isp1504.c | 108 +++++++++++++++++++++++++++++++++++++++++++
include/linux/usb/isp1504.h | 6 ++
5 files changed, 123 insertions(+), 0 deletions(-)
create mode 100644 drivers/usb/otg/isp1504.c
create mode 100644 include/linux/usb/isp1504.h
diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile
index 19cb7d5..3ecf7e6 100644
--- a/drivers/usb/Makefile
+++ b/drivers/usb/Makefile
@@ -42,3 +42,5 @@ obj-$(CONFIG_USB) += misc/
obj-$(CONFIG_USB_ATM) += atm/
obj-$(CONFIG_USB_SPEEDTOUCH) += atm/
+
+obj-$(CONFIG_USB_ISP1504) += otg/
diff --git a/drivers/usb/otg/Kconfig b/drivers/usb/otg/Kconfig
index aa884d0..c393aba 100644
--- a/drivers/usb/otg/Kconfig
+++ b/drivers/usb/otg/Kconfig
@@ -41,6 +41,12 @@ config ISP1301_OMAP
This driver can also be built as a module. If so, the module
will be called isp1301_omap.
+config USB_ISP1504
+ bool "NXP ISP1504 Transceiver Driver"
+ help
+ Enable this to support the NXP ISP1504 USB OTG transceiver which
+ are likely found on embedded boards.
+
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 2081678..718b896 100644
--- a/drivers/usb/otg/Makefile
+++ b/drivers/usb/otg/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_USB_GPIO_VBUS) += gpio_vbus.o
obj-$(CONFIG_ISP1301_OMAP) += isp1301_omap.o
obj-$(CONFIG_TWL4030_USB) += twl4030-usb.o
obj-$(CONFIG_NOP_USB_XCEIV) += nop-usb-xceiv.o
+obj-$(CONFIG_USB_ISP1504) += isp1504.o
ccflags-$(CONFIG_USB_DEBUG) += -DDEBUG
ccflags-$(CONFIG_USB_GADGET_DEBUG) += -DDEBUG
diff --git a/drivers/usb/otg/isp1504.c b/drivers/usb/otg/isp1504.c
new file mode 100644
index 0000000..8a449db
--- /dev/null
+++ b/drivers/usb/otg/isp1504.c
@@ -0,0 +1,108 @@
+/*
+ * isp1504 - NXP ISP 1504 USB transceiver
+ *
+ * Copyright (C) 2009 Daniel Mack <daniel@xxxxxxxx>
+ *
+ * Based on sources from
+ *
+ * Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
+ * Freescale Semiconductors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/usb.h>
+#include <linux/usb/otg.h>
+
+
+/* ISP 1504 register addresses */
+#define ISP1504_VID_LOW 0x00 /* Vendor ID low */
+#define ISP1504_VID_HIGH 0x01 /* Vendor ID high */
+#define ISP1504_PID_LOW 0x02 /* Product ID low */
+#define ISP1504_PID_HIGH 0x03 /* Product ID high */
+#define ISP1504_ITFCTL 0x07 /* Interface Control */
+#define ISP1504_OTGCTL 0x0A /* OTG Control */
+
+/* add to above register address to access Set/Clear functions */
+#define ISP1504_REG_SET 0x01
+#define ISP1504_REG_CLEAR 0x02
+
+/* 1504 OTG Control Register bits */
+#define USE_EXT_VBUS_IND (1 << 7) /* Use ext. Vbus indicator */
+#define DRV_VBUS_EXT (1 << 6) /* Drive Vbus external */
+#define DRV_VBUS (1 << 5) /* Drive Vbus */
+#define CHRG_VBUS (1 << 4) /* Charge Vbus */
+#define DISCHRG_VBUS (1 << 3) /* Discharge Vbus */
+#define DM_PULL_DOWN (1 << 2) /* enable DM Pull Down */
+#define DP_PULL_DOWN (1 << 1) /* enable DP Pull Down */
+#define ID_PULL_UP (1 << 0) /* enable ID Pull Up */
+
+/* 1504 hardcoded IDs, used for probing */
+#define ISP1504_ULPI_VID 0x04cc
+#define ISP1504_ULPI_PID 0x1504
+
+static int isp1504_init(struct otg_transceiver *otg)
+{
+ int vid, pid;
+
+ vid = (otg_io_read(otg, ISP1504_VID_HIGH) << 8) |
+ otg_io_read(otg, ISP1504_VID_LOW);
+ pid = (otg_io_read(otg, ISP1504_PID_HIGH) << 8) |
+ otg_io_read(otg, ISP1504_PID_LOW);
+
+ pr_info("ULPI transceiver vendor/product ID 0x%x/0x%x\n", vid, pid);
+ if (vid != ISP1504_ULPI_VID || pid != ISP1504_ULPI_PID) {
+ pr_err("No ISP1504 found\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static int isp1504_set_vbus(struct otg_transceiver *otg, bool on)
+{
+ if (on)
+ return otg_io_write(otg, DRV_VBUS_EXT | DRV_VBUS |
+ USE_EXT_VBUS_IND | CHRG_VBUS,
+ ISP1504_OTGCTL + ISP1504_REG_SET);
+ else {
+ int ret = otg_io_write(otg, DRV_VBUS_EXT | DRV_VBUS,
+ ISP1504_OTGCTL + ISP1504_REG_CLEAR);
+ if (ret)
+ return ret;
+
+ return otg_io_write(otg, USE_EXT_VBUS_IND | DISCHRG_VBUS,
+ ISP1504_OTGCTL + ISP1504_REG_SET);
+ }
+}
+
+struct otg_transceiver *
+otg_isp1504_create(struct otg_io_access_ops *ops)
+{
+ struct otg_transceiver *otg;
+
+ otg = kzalloc(sizeof(*otg), GFP_KERNEL);
+ if (!otg)
+ return NULL;
+
+ otg->label = "ISP1504";
+ otg->io_ops = ops;
+ otg->init = isp1504_init;
+ otg->set_vbus = isp1504_set_vbus;
+
+ return otg;
+}
+EXPORT_SYMBOL_GPL(otg_isp1504_create);
diff --git a/include/linux/usb/isp1504.h b/include/linux/usb/isp1504.h
new file mode 100644
index 0000000..2c14a18
--- /dev/null
+++ b/include/linux/usb/isp1504.h
@@ -0,0 +1,6 @@
+#ifndef __LINUX_USB_ISP1504_XCVR_H
+#define __LINUX_USB_ISP1504_XCVR_H
+
+extern struct otg_transceiver *otg_isp1504_create(struct otg_io_access_ops *ops);
+
+#endif /* __LINUX_USB_ISP1504_XCVR_H */
--
1.6.3.3
--
To unsubscribe from this list: send the line "unsubscribe linux-usb" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
