Add generic functions for ULPI init and setting bits in
ULPI registers.
Signed-off-by: Jana Rapava <ferma...@gmail.com>
Cc: Marek Vasut <marek.va...@gmail.com>
Cc: Remy Bohmer <li...@bohmer.net>
Cc: Stefano Babic <sba...@denx.de>
Cc: Igor Grinberg <grinb...@compulab.co.il>
Cc: Wolfgang Grandegger <w...@denx.de>
---
This patch is a prerequisite for Efika USB patchset.
Changes for v2:
- make code EHCI-independent
- use udelay() in waiting loop
- mark static functions as static
- naming changes
I haven't rewritten the ULPI registers interface, because I haven't any
idea how to implement it in some better way.
Makefile | 1 +
drivers/usb/ulpi/Makefile | 45 +++++++++++++++
drivers/usb/ulpi/ulpi-viewport.c | 87 +++++++++++++++++++++++++++++
drivers/usb/ulpi/ulpi.c | 113 ++++++++++++++++++++++++++++++++++++++
4 files changed, 246 insertions(+), 0 deletions(-)
create mode 100644 drivers/usb/ulpi/Makefile
create mode 100644 drivers/usb/ulpi/ulpi-viewport.c
create mode 100644 drivers/usb/ulpi/ulpi.c
diff --git a/Makefile b/Makefile
index dfe939f..70a1e1e 100644
--- a/Makefile
+++ b/Makefile
@@ -272,6 +272,7 @@ LIBS += drivers/usb/gadget/libusb_gadget.o
LIBS += drivers/usb/host/libusb_host.o
LIBS += drivers/usb/musb/libusb_musb.o
LIBS += drivers/usb/phy/libusb_phy.o
+LIBS += drivers/usb/ulpi/libusb_ulpi.o
LIBS += drivers/video/libvideo.o
LIBS += drivers/watchdog/libwatchdog.o
LIBS += common/libcommon.o
diff --git a/drivers/usb/ulpi/Makefile b/drivers/usb/ulpi/Makefile
new file mode 100644
index 0000000..64561af
--- /dev/null
+++ b/drivers/usb/ulpi/Makefile
@@ -0,0 +1,45 @@
+#
+# Copyright (C) 2011 Jana Rapava <ferma...@gmail.com>
+# See file CREDITS for list of people who contributed to this
+# project.
+#
+# 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., 59 Temple Place, Suite 330, Boston,
+# MA 02111-1307 USA
+#
+
+include $(TOPDIR)/config.mk
+
+LIB := $(obj)libusb_ulpi.o
+
+COBJS-$(CONFIG_USB_ULPI) += ulpi.o
+COBJS-$(CONFIG_USB_ULPI_VIEWPORT) += ulpi-viewport.o
+
+COBJS := $(COBJS-y)
+SRCS := $(COBJS:.o=.c)
+OBJS := $(addprefix $(obj),$(COBJS))
+
+all: $(LIB)
+
+$(LIB): $(obj).depend $(OBJS)
+ $(call cmd_link_o_target, $(OBJS))
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
diff --git a/drivers/usb/ulpi/ulpi-viewport.c b/drivers/usb/ulpi/ulpi-viewport.c
new file mode 100644
index 0000000..9250b09
--- /dev/null
+++ b/drivers/usb/ulpi/ulpi-viewport.c
@@ -0,0 +1,87 @@
+/*
+ * Copyright (C) 2011 Jana Rapava <ferma...@gmail.com>
+ * Based on:
+ * linux/drivers/usb/otg/ulpi_viewport.c
+ *
+ * Original Copyright follow:
+ * 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 <common.h>
+#include <asm/io.h>
+#include <usb/ulpi.h>
+
+/* ULPI viewport control bits */
+#define ULPI_WU (1 << 31)
+#define ULPI_SS (1 << 27)
+#define ULPI_RWRUN (1 << 30)
+#define ULPI_RWCTRL (1 << 29)
+
+#define ULPI_ADDR_SHIFT 16
+#define ulpi_write_mask(value) ((value) & 0xff)
+#define ulpi_read_mask(value) (((value) >> 8) & 0xff)
+
+static int ulpi_wait(u32 ulpi_viewport, u32 ulpi_value, u32 ulpi_mask)
+{
+ int timeout = ULPI_TIMEOUT;
+ u32 tmp;
+
+ writel(ulpi_value, ulpi_viewport);
+
+ /* Wait for the bits in ulpi_mask to become zero. */
+ while (--timeout) {
+ tmp = readl(ulpi_viewport);
+ if (!(tmp & ulpi_mask))
+ break;
+ udelay(1);
+ }
+
+ return !timeout;
+}
+
+static int ulpi_wakeup(u32 ulpi_viewport)
+{
+ if (readl(ulpi_viewport) & ULPI_SS)
+ return 0; /* already awake */
+
+ return ulpi_wait(ulpi_viewport, ULPI_WU, ULPI_WU);
+}
+
+void ulpi_write(u32 ulpi_viewport, u32 reg, u32 value)
+{
+ u32 tmp;
+ if (ulpi_wakeup(ulpi_viewport)) {
+ printf("ULPI wakeup timed out\n");
+ return;
+ }
+
+ tmp = ulpi_wait(ulpi_viewport, ULPI_RWRUN | ULPI_RWCTRL |
+ reg << ULPI_ADDR_SHIFT | ulpi_write_mask(value), ULPI_RWRUN);
+ if (tmp)
+ printf("ULPI write timed out\n");
+}
+
+u32 ulpi_read(u32 ulpi_viewport, u32 reg)
+{
+ if (ulpi_wakeup(ulpi_viewport)) {
+ printf("ULPI wakeup timed out\n");
+ return 0;
+ }
+
+ if (ulpi_wait(ulpi_viewport, ULPI_RWRUN | reg << ULPI_ADDR_SHIFT,
ULPI_RWRUN)) {
+ printf("ULPI read timed out\n");
+ return 0;
+ }
+
+ return ulpi_read_mask(readl(ulpi_viewport));
+}
diff --git a/drivers/usb/ulpi/ulpi.c b/drivers/usb/ulpi/ulpi.c
new file mode 100644
index 0000000..c17bb73
--- /dev/null
+++ b/drivers/usb/ulpi/ulpi.c
@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2011 Jana Rapava <ferma...@gmail.com>
+ * Based on:
+ * linux/drivers/usb/otg/ulpi.c
+ * Generic ULPI USB transceiver support
+ *
+ * Original Copyright follow:
+ * Copyright (C) 2009 Daniel Mack <dan...@caiaq.de>
+ *
+ * Based on sources from
+ *
+ * Sascha Hauer <s.ha...@pengutronix.de>
+ * 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.
+ */
+
+#include <common.h>
+#include <exports.h>
+#include <usb/ulpi.h>
+
+static void ulpi_integrity_check(u32 ulpi_viewport, struct ulpi_regs *ulpi)
+{
+ u32 tmp = 0;
+ int i;
+ for (i = 0; i < 2; i++) {
+ ulpi_write(ulpi_viewport, (u32)&ulpi->scratch,
+ ULPI_TEST_VALUE << i);
+ tmp = ulpi_read(ulpi_viewport, (u32)&ulpi->scratch);
+
+ if (tmp != (ULPI_TEST_VALUE << i)) {
+ printf("ULPI integrity check failed\n");
+ return;
+ }
+ }
+}
+
+/*
+ * This is a family of wrapper functions which sets bits in ULPI registers.
+ * Access mode could be WRITE, SET or CLEAR.
+ * For further informations see ULPI 1.1 specification.
+ */
+void ulpi_otg_ctrl_flags(u32 ulpi_viewport,
+ struct ulpi_regs *ulpi, int access_mode, u32 flags)
+{
+ switch (access_mode) {
+ case ULPI_WRITE:
+ ulpi_write(ulpi_viewport, (u32)&ulpi->otg_ctrl, flags);
+ break;
+ case ULPI_SET:
+ ulpi_write(ulpi_viewport, (u32)&ulpi->otg_ctrl_set, flags);
+ break;
+ case ULPI_CLEAR:
+ ulpi_write(ulpi_viewport, (u32)&ulpi->otg_ctrl_clear, flags);
+ break;
+ }
+}
+
+void ulpi_function_ctrl_flags(u32 ulpi_viewport,
+ struct ulpi_regs *ulpi, int access_mode, u32 flags)
+{
+ switch (access_mode) {
+ case ULPI_WRITE:
+ ulpi_write(ulpi_viewport, (u32)&ulpi->function_ctrl, flags);
+ break;
+ case ULPI_SET:
+ ulpi_write(ulpi_viewport, (u32)&ulpi->function_ctrl_set, flags);
+ break;
+ case ULPI_CLEAR:
+ ulpi_write(ulpi_viewport, (u32)&ulpi->function_ctrl_clear,
flags);
+ break;
+ }
+}
+
+void ulpi_iface_ctrl_flags(u32 ulpi_viewport,
+ struct ulpi_regs *ulpi, int access_mode, u32 flags)
+{
+ switch (access_mode) {
+ case ULPI_WRITE:
+ ulpi_write(ulpi_viewport, (u32)&ulpi->iface_ctrl, flags);
+ break;
+ case ULPI_SET:
+ ulpi_write(ulpi_viewport, (u32)&ulpi->iface_ctrl_set, flags);
+ break;
+ case ULPI_CLEAR:
+ ulpi_write(ulpi_viewport, (u32)&ulpi->iface_ctrl_clear, flags);
+ break;
+ }
+
+}
+
+void ulpi_init(u32 ulpi_viewport, struct ulpi_regs *ulpi)
+{
+ u32 tmp = 0;
+ int reg;
+
+ /* Assemble ID from four ULPI ID registers (8 bits each). */
+ for (reg = ULPI_ID_REGS_COUNT - 1; reg >= 0; reg--)
+ tmp |= ulpi_read(ulpi_viewport, reg) << (reg * 8);
+
+ /* Split ID into vendor and product ID. */
+ debug("Found ULPI TX, ID %04x:%04x\n", tmp >> 16, tmp & 0xffff);
+
+ ulpi_integrity_check(ulpi_viewport, ulpi);
+}
--
1.7.6.3
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