287 lines
7.8 KiB
Diff
287 lines
7.8 KiB
Diff
From: Maxime Ripard <maxime.ripard@free-electrons.com>
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Date: Thu, 30 May 2013 03:49:21 +0000
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Subject: [PATCH 02/10] net: Add MDIO bus driver for the Allwinner EMAC
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Origin: https://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git/commit?id=4bdcb1dd9feb03608e12cfa46aba385035af8ea5
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Bug-Debian: http://bugs.debian.org/711998
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This patch adds a separate driver for the MDIO interface of the
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Allwinner ethernet controllers.
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Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
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Tested-by: Richard Genoud <richard.genoud@gmail.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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.../bindings/net/allwinner,sun4i-mdio.txt | 26 +++
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drivers/net/phy/Kconfig | 10 +
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drivers/net/phy/Makefile | 1 +
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drivers/net/phy/mdio-sun4i.c | 194 ++++++++++++++++++++
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4 files changed, 231 insertions(+)
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create mode 100644 Documentation/devicetree/bindings/net/allwinner,sun4i-mdio.txt
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create mode 100644 drivers/net/phy/mdio-sun4i.c
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diff --git a/Documentation/devicetree/bindings/net/allwinner,sun4i-mdio.txt b/Documentation/devicetree/bindings/net/allwinner,sun4i-mdio.txt
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new file mode 100644
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index 0000000..00b9f9a
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--- /dev/null
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+++ b/Documentation/devicetree/bindings/net/allwinner,sun4i-mdio.txt
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@@ -0,0 +1,26 @@
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+* Allwinner A10 MDIO Ethernet Controller interface
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+
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+Required properties:
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+- compatible: should be "allwinner,sun4i-mdio".
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+- reg: address and length of the register set for the device.
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+
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+Optional properties:
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+- phy-supply: phandle to a regulator if the PHY needs one
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+
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+Example at the SoC level:
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+mdio@01c0b080 {
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+ compatible = "allwinner,sun4i-mdio";
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+ reg = <0x01c0b080 0x14>;
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+};
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+
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+And at the board level:
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+
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+mdio@01c0b080 {
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+ phy-supply = <®_emac_3v3>;
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+
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+ phy0: ethernet-phy@0 {
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+ reg = <0>;
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+ };
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+};
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diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
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index 1e11f2b..3a316b3 100644
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--- a/drivers/net/phy/Kconfig
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+++ b/drivers/net/phy/Kconfig
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@@ -144,6 +144,16 @@ config MDIO_OCTEON
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If in doubt, say Y.
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+config MDIO_SUN4I
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+ tristate "Allwinner sun4i MDIO interface support"
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+ depends on ARCH_SUNXI
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+ select REGULATOR
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+ select REGULATOR_FIXED_VOLTAGE
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+ help
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+ This driver supports the MDIO interface found in the network
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+ interface units of the Allwinner SoC that have an EMAC (A10,
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+ A12, A10s, etc.)
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+
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config MDIO_BUS_MUX
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tristate
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depends on OF_MDIO
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diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
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index 9645e38..23a2ab2 100644
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--- a/drivers/net/phy/Makefile
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+++ b/drivers/net/phy/Makefile
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@@ -30,3 +30,4 @@ obj-$(CONFIG_AMD_PHY) += amd.o
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obj-$(CONFIG_MDIO_BUS_MUX) += mdio-mux.o
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obj-$(CONFIG_MDIO_BUS_MUX_GPIO) += mdio-mux-gpio.o
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obj-$(CONFIG_MDIO_BUS_MUX_MMIOREG) += mdio-mux-mmioreg.o
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+obj-$(CONFIG_MDIO_SUN4I) += mdio-sun4i.o
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diff --git a/drivers/net/phy/mdio-sun4i.c b/drivers/net/phy/mdio-sun4i.c
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new file mode 100644
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index 0000000..61d3f4e
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--- /dev/null
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+++ b/drivers/net/phy/mdio-sun4i.c
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@@ -0,0 +1,194 @@
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+/*
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+ * Allwinner EMAC MDIO interface driver
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+ *
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+ * Copyright 2012-2013 Stefan Roese <sr@denx.de>
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+ * Copyright 2013 Maxime Ripard <maxime.ripard@free-electrons.com>
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+ *
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+ * Based on the Linux driver provided by Allwinner:
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+ * Copyright (C) 1997 Sten Wang
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+ *
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+ * This file is licensed under the terms of the GNU General Public
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+ * License version 2. This program is licensed "as is" without any
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+ * warranty of any kind, whether express or implied.
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+ */
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+
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+#include <linux/delay.h>
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+#include <linux/init.h>
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/mutex.h>
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+#include <linux/of_address.h>
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+#include <linux/of_mdio.h>
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+#include <linux/phy.h>
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+#include <linux/platform_device.h>
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+#include <linux/regulator/consumer.h>
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+
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+#define EMAC_MAC_MCMD_REG (0x00)
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+#define EMAC_MAC_MADR_REG (0x04)
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+#define EMAC_MAC_MWTD_REG (0x08)
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+#define EMAC_MAC_MRDD_REG (0x0c)
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+#define EMAC_MAC_MIND_REG (0x10)
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+#define EMAC_MAC_SSRR_REG (0x14)
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+
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+#define MDIO_TIMEOUT (msecs_to_jiffies(100))
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+
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+struct sun4i_mdio_data {
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+ void __iomem *membase;
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+ struct regulator *regulator;
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+};
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+
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+static int sun4i_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
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+{
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+ struct sun4i_mdio_data *data = bus->priv;
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+ unsigned long start_jiffies;
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+ int value;
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+
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+ /* issue the phy address and reg */
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+ writel((mii_id << 8) | regnum, data->membase + EMAC_MAC_MADR_REG);
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+ /* pull up the phy io line */
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+ writel(0x1, data->membase + EMAC_MAC_MCMD_REG);
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+
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+ /* Wait read complete */
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+ start_jiffies = jiffies;
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+ while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) {
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+ if (time_after(start_jiffies,
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+ start_jiffies + MDIO_TIMEOUT))
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+ return -ETIMEDOUT;
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+ msleep(1);
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+ }
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+
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+ /* push down the phy io line */
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+ writel(0x0, data->membase + EMAC_MAC_MCMD_REG);
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+ /* and read data */
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+ value = readl(data->membase + EMAC_MAC_MRDD_REG);
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+
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+ return value;
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+}
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+
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+static int sun4i_mdio_write(struct mii_bus *bus, int mii_id, int regnum,
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+ u16 value)
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+{
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+ struct sun4i_mdio_data *data = bus->priv;
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+ unsigned long start_jiffies;
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+
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+ /* issue the phy address and reg */
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+ writel((mii_id << 8) | regnum, data->membase + EMAC_MAC_MADR_REG);
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+ /* pull up the phy io line */
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+ writel(0x1, data->membase + EMAC_MAC_MCMD_REG);
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+
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+ /* Wait read complete */
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+ start_jiffies = jiffies;
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+ while (readl(data->membase + EMAC_MAC_MIND_REG) & 0x1) {
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+ if (time_after(start_jiffies,
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+ start_jiffies + MDIO_TIMEOUT))
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+ return -ETIMEDOUT;
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+ msleep(1);
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+ }
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+
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+ /* push down the phy io line */
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+ writel(0x0, data->membase + EMAC_MAC_MCMD_REG);
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+ /* and write data */
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+ writel(value, data->membase + EMAC_MAC_MWTD_REG);
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+
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+ return 0;
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+}
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+
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+static int sun4i_mdio_reset(struct mii_bus *bus)
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+{
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+ return 0;
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+}
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+
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+static int sun4i_mdio_probe(struct platform_device *pdev)
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+{
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+ struct device_node *np = pdev->dev.of_node;
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+ struct mii_bus *bus;
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+ struct sun4i_mdio_data *data;
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+ int ret, i;
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+
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+ bus = mdiobus_alloc_size(sizeof(*data));
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+ if (!bus)
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+ return -ENOMEM;
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+
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+ bus->name = "sun4i_mii_bus";
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+ bus->read = &sun4i_mdio_read;
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+ bus->write = &sun4i_mdio_write;
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+ bus->reset = &sun4i_mdio_reset;
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+ snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(&pdev->dev));
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+ bus->parent = &pdev->dev;
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+
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+ bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
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+ if (!bus->irq) {
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+ ret = -ENOMEM;
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+ goto err_out_free_mdiobus;
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+ }
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+
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+ for (i = 0; i < PHY_MAX_ADDR; i++)
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+ bus->irq[i] = PHY_POLL;
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+
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+ data = bus->priv;
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+ data->membase = of_iomap(np, 0);
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+ if (!data->membase) {
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+ ret = -ENOMEM;
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+ goto err_out_free_mdio_irq;
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+ }
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+
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+ data->regulator = devm_regulator_get(&pdev->dev, "phy");
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+ if (IS_ERR(data->regulator)) {
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+ if (PTR_ERR(data->regulator) == -EPROBE_DEFER)
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+ return -EPROBE_DEFER;
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+
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+ dev_info(&pdev->dev, "no regulator found\n");
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+ } else {
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+ ret = regulator_enable(data->regulator);
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+ if (ret)
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+ goto err_out_free_mdio_irq;
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+ }
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+
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+ ret = of_mdiobus_register(bus, np);
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+ if (ret < 0)
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+ goto err_out_disable_regulator;
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+
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+ platform_set_drvdata(pdev, bus);
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+
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+ return 0;
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+
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+err_out_disable_regulator:
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+ regulator_disable(data->regulator);
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+err_out_free_mdio_irq:
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+ kfree(bus->irq);
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+err_out_free_mdiobus:
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+ mdiobus_free(bus);
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+ return ret;
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+}
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+
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+static int sun4i_mdio_remove(struct platform_device *pdev)
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+{
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+ struct mii_bus *bus = platform_get_drvdata(pdev);
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+
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+ mdiobus_unregister(bus);
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+ kfree(bus->irq);
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+ mdiobus_free(bus);
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+
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+ return 0;
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+}
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+
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+static const struct of_device_id sun4i_mdio_dt_ids[] = {
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+ { .compatible = "allwinner,sun4i-mdio" },
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+ { }
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+};
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+MODULE_DEVICE_TABLE(of, sun4i_mdio_dt_ids);
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+
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+static struct platform_driver sun4i_mdio_driver = {
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+ .probe = sun4i_mdio_probe,
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+ .remove = sun4i_mdio_remove,
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+ .driver = {
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+ .name = "sun4i-mdio",
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+ .of_match_table = sun4i_mdio_dt_ids,
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+ },
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+};
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+
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+module_platform_driver(sun4i_mdio_driver);
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+
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+MODULE_DESCRIPTION("Allwinner EMAC MDIO interface driver");
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+MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
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+MODULE_LICENSE("GPL");
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--
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1.7.10.4
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