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authorSascha Hauer <s.hauer@pengutronix.de>2019-03-11 14:18:20 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2019-03-11 14:20:58 +0100
commit6e355bb2685bd7706964da9acc5dfee0b32fa045 (patch)
treedc3c26b1e7a2d4307d1ff897185a6509ebbd9666 /drivers
parent0826d25d3699a34385c740f9bff90693411eebf3 (diff)
downloadbarebox-6e355bb2685bd7706964da9acc5dfee0b32fa045.tar.gz
net: phy: Add register access helper functions for phys
Linux has phy helpers to access paged registers and to modify phy registers. Add them to barebox for upcoming realtek phy support. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/phy/Makefile2
-rw-r--r--drivers/net/phy/phy-core.c175
2 files changed, 176 insertions, 1 deletions
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index 5f11a85..5dd9bd5 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -1,4 +1,4 @@
-obj-y += phy.o mdio_bus.o
+obj-y += phy.o mdio_bus.o phy-core.o
obj-$(CONFIG_AR8327N_PHY) += ar8327.o
obj-$(CONFIG_AT803X_PHY) += at803x.o
obj-$(CONFIG_DAVICOM_PHY) += davicom.o
diff --git a/drivers/net/phy/phy-core.c b/drivers/net/phy/phy-core.c
new file mode 100644
index 0000000..21daaa9
--- /dev/null
+++ b/drivers/net/phy/phy-core.c
@@ -0,0 +1,175 @@
+#include <common.h>
+#include <linux/phy.h>
+
+/**
+ * phy_modify - Convenience function for modifying a given PHY register
+ * @phydev: the phy_device struct
+ * @regnum: register number to write
+ * @mask: bit mask of bits to clear
+ * @set: new value of bits set in mask to write to @regnum
+ *
+ */
+int phy_modify(struct phy_device *phydev, u32 regnum, u16 mask, u16 set)
+{
+ int ret;
+
+ ret = phy_read(phydev, regnum);
+ if (ret < 0)
+ return ret;
+
+ ret = phy_write(phydev, regnum, (ret & ~mask) | set);
+
+ return ret < 0 ? ret : 0;
+}
+
+static int phy_read_page(struct phy_device *phydev)
+{
+ struct phy_driver *phydrv = to_phy_driver(phydev->dev.driver);
+
+ return phydrv->read_page(phydev);
+}
+
+static int phy_write_page(struct phy_device *phydev, int page)
+{
+ struct phy_driver *phydrv = to_phy_driver(phydev->dev.driver);
+
+ return phydrv->write_page(phydev, page);
+}
+
+/**
+ * phy_save_page() - take the bus lock and save the current page
+ * @phydev: a pointer to a &struct phy_device
+ *
+ * Take the MDIO bus lock, and return the current page number. On error,
+ * returns a negative errno. phy_restore_page() must always be called
+ * after this, irrespective of success or failure of this call.
+ */
+int phy_save_page(struct phy_device *phydev)
+{
+ return phy_read_page(phydev);
+}
+
+/**
+ * phy_select_page() - take the bus lock, save the current page, and set a page
+ * @phydev: a pointer to a &struct phy_device
+ * @page: desired page
+ *
+ * Take the MDIO bus lock to protect against concurrent access, save the
+ * current PHY page, and set the current page. On error, returns a
+ * negative errno, otherwise returns the previous page number.
+ * phy_restore_page() must always be called after this, irrespective
+ * of success or failure of this call.
+ */
+int phy_select_page(struct phy_device *phydev, int page)
+{
+ int ret, oldpage;
+
+ oldpage = ret = phy_save_page(phydev);
+ if (ret < 0)
+ return ret;
+
+ if (oldpage != page) {
+ ret = phy_write_page(phydev, page);
+ if (ret < 0)
+ return ret;
+ }
+
+ return oldpage;
+}
+
+/**
+ * phy_restore_page() - restore the page register and release the bus lock
+ * @phydev: a pointer to a &struct phy_device
+ * @oldpage: the old page, return value from phy_save_page() or phy_select_page()
+ * @ret: operation's return code
+ *
+ * Release the MDIO bus lock, restoring @oldpage if it is a valid page.
+ * This function propagates the earliest error code from the group of
+ * operations.
+ *
+ * Returns:
+ * @oldpage if it was a negative value, otherwise
+ * @ret if it was a negative errno value, otherwise
+ * phy_write_page()'s negative value if it were in error, otherwise
+ * @ret.
+ */
+int phy_restore_page(struct phy_device *phydev, int oldpage, int ret)
+{
+ int r;
+
+ if (oldpage >= 0) {
+ r = phy_write_page(phydev, oldpage);
+
+ /* Propagate the operation return code if the page write
+ * was successful.
+ */
+ if (ret >= 0 && r < 0)
+ ret = r;
+ } else {
+ /* Propagate the phy page selection error code */
+ ret = oldpage;
+ }
+
+ return ret;
+}
+
+/**
+ * phy_read_paged() - Convenience function for reading a paged register
+ * @phydev: a pointer to a &struct phy_device
+ * @page: the page for the phy
+ * @regnum: register number
+ *
+ * Same rules as for phy_read().
+ */
+int phy_read_paged(struct phy_device *phydev, int page, u32 regnum)
+{
+ int ret = 0, oldpage;
+
+ oldpage = phy_select_page(phydev, page);
+ if (oldpage >= 0)
+ ret = phy_read(phydev, regnum);
+
+ return phy_restore_page(phydev, oldpage, ret);
+}
+
+/**
+ * phy_write_paged() - Convenience function for writing a paged register
+ * @phydev: a pointer to a &struct phy_device
+ * @page: the page for the phy
+ * @regnum: register number
+ * @val: value to write
+ *
+ * Same rules as for phy_write().
+ */
+int phy_write_paged(struct phy_device *phydev, int page, u32 regnum, u16 val)
+{
+ int ret = 0, oldpage;
+
+ oldpage = phy_select_page(phydev, page);
+ if (oldpage >= 0)
+ ret = phy_write(phydev, regnum, val);
+
+ return phy_restore_page(phydev, oldpage, ret);
+}
+
+/**
+ * phy_modify_paged() - Convenience function for modifying a paged register
+ * @phydev: a pointer to a &struct phy_device
+ * @page: the page for the phy
+ * @regnum: register number
+ * @mask: bit mask of bits to clear
+ * @set: bit mask of bits to set
+ *
+ * Same rules as for phy_read() and phy_write().
+ */
+int phy_modify_paged(struct phy_device *phydev, int page, u32 regnum,
+ u16 mask, u16 set)
+{
+ int ret = 0, oldpage;
+
+ oldpage = phy_select_page(phydev, page);
+ if (oldpage >= 0)
+ ret = phy_modify(phydev, regnum, mask, set);
+
+ return phy_restore_page(phydev, oldpage, ret);
+}