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authorJean-Jacques Hiblot <jjhiblot@ti.com>2017-04-24 09:51:27 (GMT)
committerSimon Glass <sjg@chromium.org>2017-05-09 18:14:16 (GMT)
commit72e5016f878d142e925f0016cee4ee7cbf42ae5b (patch)
treeb0c1cdab3323947c4d6fd4a01d2937402beda379 /drivers/phy
parentd52063b84f422caa2aad15fc981299ffd843e910 (diff)
downloadu-boot-72e5016f878d142e925f0016cee4ee7cbf42ae5b.tar.xz
drivers: phy: add generic PHY framework
The PHY framework provides a set of APIs to control a PHY. This API is derived from the linux version of the generic PHY framework. Currently the API supports init(), deinit(), power_on, power_off() and reset(). The framework provides a way to get a reference to a phy from the device-tree. Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com> Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/phy')
-rw-r--r--drivers/phy/Kconfig36
-rw-r--r--drivers/phy/Makefile8
-rw-r--r--drivers/phy/phy-uclass.c139
3 files changed, 183 insertions, 0 deletions
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
new file mode 100644
index 0000000..0a74920
--- /dev/null
+++ b/drivers/phy/Kconfig
@@ -0,0 +1,36 @@
+
+menu "PHY Subsystem"
+
+config PHY
+ bool "PHY Core"
+ depends on DM
+ help
+ PHY support.
+
+ This framework is designed to provide a generic interface for PHY
+ devices. PHY devices are dedicated hardware that handle the physical
+ layer of the protocols in the OSI model.
+ PHYs are commonly used for high speed interfaces such as Serial-ATA
+ or PCI express.
+ The API provides functions to initialize/deinitialize the
+ PHY, power on/off the PHY, and reset the PHY. It's meant to be as
+ compatible as possible with the equivalent framework found in the
+ linux kernel.
+
+config SPL_PHY
+ bool "PHY Core in SPL"
+ depends on DM
+ help
+ PHY support in SPL.
+
+ This framework is designed to provide a generic interface for PHY
+ devices. PHY devices are dedicated hardware that handle the physical
+ layer of the protocols (https://en.wikipedia.org/wiki/OSI_model).
+ PHYs are commonly used for high speed interfaces such as Serial-ATA
+ or PCI express.
+ The API provides functions to initialize/deinitialize the
+ PHY, power on/off the PHY, and reset the PHY. It's meant to be as
+ compatible as possible with the equivalent framework found in the
+ linux kernel.
+
+endmenu
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
new file mode 100644
index 0000000..45f786a
--- /dev/null
+++ b/drivers/phy/Makefile
@@ -0,0 +1,8 @@
+#
+# Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
+# Written by Jean-Jacques Hiblot <jjhiblot@ti.com>
+#
+# SPDX-License-Identifier: GPL-2.0+
+#
+
+obj-$(CONFIG_$(SPL_)PHY) += phy-uclass.o
diff --git a/drivers/phy/phy-uclass.c b/drivers/phy/phy-uclass.c
new file mode 100644
index 0000000..0d8bef7
--- /dev/null
+++ b/drivers/phy/phy-uclass.c
@@ -0,0 +1,139 @@
+/*
+ * Copyright (C) 2017 Texas Instruments Incorporated - http://www.ti.com/
+ * Written by Jean-Jacques Hiblot <jjhiblot@ti.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <generic-phy.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static inline struct phy_ops *phy_dev_ops(struct udevice *dev)
+{
+ return (struct phy_ops *)dev->driver->ops;
+}
+
+static int generic_phy_xlate_offs_flags(struct phy *phy,
+ struct fdtdec_phandle_args *args)
+{
+ debug("%s(phy=%p)\n", __func__, phy);
+
+ if (args->args_count > 1) {
+ debug("Invaild args_count: %d\n", args->args_count);
+ return -EINVAL;
+ }
+
+ if (args->args_count)
+ phy->id = args->args[0];
+ else
+ phy->id = 0;
+
+
+ return 0;
+}
+
+int generic_phy_get_by_index(struct udevice *dev, int index,
+ struct phy *phy)
+{
+ struct fdtdec_phandle_args args;
+ struct phy_ops *ops;
+ int ret;
+ struct udevice *phydev;
+
+ debug("%s(dev=%p, index=%d, phy=%p)\n", __func__, dev, index, phy);
+
+ assert(phy);
+ ret = fdtdec_parse_phandle_with_args(gd->fdt_blob, dev_of_offset(dev),
+ "phys", "#phy-cells", 0, index,
+ &args);
+ if (ret) {
+ debug("%s: fdtdec_parse_phandle_with_args failed: err=%d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ ret = uclass_get_device_by_of_offset(UCLASS_PHY, args.node, &phydev);
+ if (ret) {
+ debug("%s: uclass_get_device_by_of_offset failed: err=%d\n",
+ __func__, ret);
+ return ret;
+ }
+
+ phy->dev = phydev;
+
+ ops = phy_dev_ops(phydev);
+
+ if (ops->of_xlate)
+ ret = ops->of_xlate(phy, &args);
+ else
+ ret = generic_phy_xlate_offs_flags(phy, &args);
+ if (ret) {
+ debug("of_xlate() failed: %d\n", ret);
+ goto err;
+ }
+
+ return 0;
+
+err:
+ return ret;
+}
+
+int generic_phy_get_by_name(struct udevice *dev, const char *phy_name,
+ struct phy *phy)
+{
+ int index;
+
+ debug("%s(dev=%p, name=%s, phy=%p)\n", __func__, dev, phy_name, phy);
+
+ index = fdt_stringlist_search(gd->fdt_blob, dev_of_offset(dev),
+ "phy-names", phy_name);
+ if (index < 0) {
+ debug("fdt_stringlist_search() failed: %d\n", index);
+ return index;
+ }
+
+ return generic_phy_get_by_index(dev, index, phy);
+}
+
+int generic_phy_init(struct phy *phy)
+{
+ struct phy_ops const *ops = phy_dev_ops(phy->dev);
+
+ return ops->init ? ops->init(phy) : 0;
+}
+
+int generic_phy_reset(struct phy *phy)
+{
+ struct phy_ops const *ops = phy_dev_ops(phy->dev);
+
+ return ops->reset ? ops->reset(phy) : 0;
+}
+
+int generic_phy_exit(struct phy *phy)
+{
+ struct phy_ops const *ops = phy_dev_ops(phy->dev);
+
+ return ops->exit ? ops->exit(phy) : 0;
+}
+
+int generic_phy_power_on(struct phy *phy)
+{
+ struct phy_ops const *ops = phy_dev_ops(phy->dev);
+
+ return ops->power_on ? ops->power_on(phy) : 0;
+}
+
+int generic_phy_power_off(struct phy *phy)
+{
+ struct phy_ops const *ops = phy_dev_ops(phy->dev);
+
+ return ops->power_off ? ops->power_off(phy) : 0;
+}
+
+UCLASS_DRIVER(phy) = {
+ .id = UCLASS_PHY,
+ .name = "phy",
+};