Merge branch 'net-phy-add-Amlogic-g12a-support'

Jerome Brunet says:

====================
net: phy: add Amlogic g12a support

This patchset adds the necessary bits to support network on the Amlogic
g12a SoC family.

Only the internal PHY and related MDIO mux needed to be addressed.
The GMAC remains compatible with axg SoC family

This series has been tested on the u200 (S905D2) with both the internal
and external (Realtek) PHYs.

Change since v2 [1]:
* Change 'clk part' Reviewed-by as suggested
* Remove default callback from phy drivers
* Use exact match PHY macros
* Default MDIO g12a as module if ARCH_MESON is enabled
* Don't print error on probe defer in the g12a mdio mux

Change since v1 [0]:
* drop '_' from function name unrelated to locking
* fix peripheral clock disable on error
* fix variable declaration reverse Xmas trees
* fix Kconfig dependency on CCF
  (Actually needed for 'struct clk_hw', Thx Andrew !)
* Minor fix in the DT exemple as reported by Rob

[0] https://lkml.kernel.org/r/20190314140135.19184-1-jbrunet@baylibre.com
[1] https://lkml.kernel.org/r/20190329141512.29867-1-jbrunet@baylibre.com
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 453 insertions, 4 deletions

diff --git a/Documentation/devicetree/bindings/net/mdio-mux-meson-g12a.txt b/Documentation/devicetree/bindings/net/mdio-mux-meson-g12a.txt
new file mode 100644
index 000000000000..3a96cbed9294
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/mdio-mux-meson-g12a.txt
@@ -0,0 +1,48 @@
+Properties for the MDIO bus multiplexer/glue of Amlogic G12a SoC family.
+
+This is a special case of a MDIO bus multiplexer. It allows to choose between
+the internal mdio bus leading to the embedded 10/100 PHY or the external
+MDIO bus.
+
+Required properties in addition to the generic multiplexer properties:
+- compatible : amlogic,g12a-mdio-mux
+- reg: physical address and length of the multiplexer/glue registers
+- clocks: list of clock phandle, one for each entry clock-names.
+- clock-names: should contain the following:
+  * "pclk"   : peripheral clock.
+  * "clkin0" : platform crytal
+  * "clkin1" : SoC 50MHz MPLL
+
+Example :
+
+mdio_mux: mdio-multiplexer@4c000 {
+	compatible = "amlogic,g12a-mdio-mux";
+	reg = <0x0 0x4c000 0x0 0xa4>;
+	clocks = <&clkc CLKID_ETH_PHY>,
+		 <&xtal>,
+		 <&clkc CLKID_MPLL_5OM>;
+	clock-names = "pclk", "clkin0", "clkin1";
+	mdio-parent-bus = <&mdio0>;
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	ext_mdio: mdio@0 {
+		reg = <0>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+	};
+
+	int_mdio: mdio@1 {
+		reg = <1>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		internal_ephy: ethernet-phy@8 {
+			compatible = "ethernet-phy-id0180.3301",
+				     "ethernet-phy-ieee802.3-c22";
+			interrupts = <GIC_SPI 9 IRQ_TYPE_LEVEL_HIGH>;
+			reg = <8>;
+			max-speed = <100>;
+		};
+	};
+};
diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 1c66e92c717c..d408b2eb2966 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -76,6 +76,17 @@ config MDIO_BUS_MUX_GPIO
 	  several child MDIO busses to a parent bus.  Child bus
 	  selection is under the control of GPIO lines.
 
+config MDIO_BUS_MUX_MESON_G12A
+	tristate "Amlogic G12a based MDIO bus multiplexer"
+	depends on ARCH_MESON || COMPILE_TEST
+	depends on OF_MDIO && HAS_IOMEM && COMMON_CLK
+	select MDIO_BUS_MUX
+	default m if ARCH_MESON
+	help
+	  This module provides a driver for the MDIO multiplexer/glue of
+	  the amlogic g12a SoC. The multiplexers connects either the external
+	  or the internal MDIO bus to the parent bus.
+
 config MDIO_BUS_MUX_MMIOREG
 	tristate "MMIO device-controlled MDIO bus multiplexers"
 	depends on OF_MDIO && HAS_IOMEM
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index ece5dae67174..27d7f9f3b0de 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_MDIO_BITBANG)	+= mdio-bitbang.o
 obj-$(CONFIG_MDIO_BUS_MUX)	+= mdio-mux.o
 obj-$(CONFIG_MDIO_BUS_MUX_BCM_IPROC)	+= mdio-mux-bcm-iproc.o
 obj-$(CONFIG_MDIO_BUS_MUX_GPIO)	+= mdio-mux-gpio.o
+obj-$(CONFIG_MDIO_BUS_MUX_MESON_G12A)	+= mdio-mux-meson-g12a.o
 obj-$(CONFIG_MDIO_BUS_MUX_MMIOREG) += mdio-mux-mmioreg.o
 obj-$(CONFIG_MDIO_BUS_MUX_MULTIPLEXER) += mdio-mux-multiplexer.o
 obj-$(CONFIG_MDIO_CAVIUM)	+= mdio-cavium.o
diff --git a/drivers/net/phy/mdio-mux-meson-g12a.c b/drivers/net/phy/mdio-mux-meson-g12a.c
new file mode 100644
index 000000000000..6fa29ea8e2a3
--- /dev/null
+++ b/drivers/net/phy/mdio-mux-meson-g12a.c
@@ -0,0 +1,380 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2019 Baylibre, SAS.
+ * Author: Jerome Brunet <jbrunet@baylibre.com>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/mdio-mux.h>
+#include <linux/module.h>
+#include <linux/phy.h>
+#include <linux/platform_device.h>
+
+#define ETH_PLL_STS		0x40
+#define ETH_PLL_CTL0		0x44
+#define  PLL_CTL0_LOCK_DIG	BIT(30)
+#define  PLL_CTL0_RST		BIT(29)
+#define  PLL_CTL0_EN		BIT(28)
+#define  PLL_CTL0_SEL		BIT(23)
+#define  PLL_CTL0_N		GENMASK(14, 10)
+#define  PLL_CTL0_M		GENMASK(8, 0)
+#define  PLL_LOCK_TIMEOUT	1000000
+#define  PLL_MUX_NUM_PARENT	2
+#define ETH_PLL_CTL1		0x48
+#define ETH_PLL_CTL2		0x4c
+#define ETH_PLL_CTL3		0x50
+#define ETH_PLL_CTL4		0x54
+#define ETH_PLL_CTL5		0x58
+#define ETH_PLL_CTL6		0x5c
+#define ETH_PLL_CTL7		0x60
+
+#define ETH_PHY_CNTL0		0x80
+#define   EPHY_G12A_ID		0x33000180
+#define ETH_PHY_CNTL1		0x84
+#define  PHY_CNTL1_ST_MODE	GENMASK(2, 0)
+#define  PHY_CNTL1_ST_PHYADD	GENMASK(7, 3)
+#define   EPHY_DFLT_ADD		8
+#define  PHY_CNTL1_MII_MODE	GENMASK(15, 14)
+#define   EPHY_MODE_RMII	0x1
+#define  PHY_CNTL1_CLK_EN	BIT(16)
+#define  PHY_CNTL1_CLKFREQ	BIT(17)
+#define  PHY_CNTL1_PHY_ENB	BIT(18)
+#define ETH_PHY_CNTL2		0x88
+#define  PHY_CNTL2_USE_INTERNAL	BIT(5)
+#define  PHY_CNTL2_SMI_SRC_MAC	BIT(6)
+#define  PHY_CNTL2_RX_CLK_EPHY	BIT(9)
+
+#define MESON_G12A_MDIO_EXTERNAL_ID 0
+#define MESON_G12A_MDIO_INTERNAL_ID 1
+
+struct g12a_mdio_mux {
+	bool pll_is_enabled;
+	void __iomem *regs;
+	void *mux_handle;
+	struct clk *pclk;
+	struct clk *pll;
+};
+
+struct g12a_ephy_pll {
+	void __iomem *base;
+	struct clk_hw hw;
+};
+
+#define g12a_ephy_pll_to_dev(_hw)			\
+	container_of(_hw, struct g12a_ephy_pll, hw)
+
+static unsigned long g12a_ephy_pll_recalc_rate(struct clk_hw *hw,
+					       unsigned long parent_rate)
+{
+	struct g12a_ephy_pll *pll = g12a_ephy_pll_to_dev(hw);
+	u32 val, m, n;
+
+	val = readl(pll->base + ETH_PLL_CTL0);
+	m = FIELD_GET(PLL_CTL0_M, val);
+	n = FIELD_GET(PLL_CTL0_N, val);
+
+	return parent_rate * m / n;
+}
+
+static int g12a_ephy_pll_enable(struct clk_hw *hw)
+{
+	struct g12a_ephy_pll *pll = g12a_ephy_pll_to_dev(hw);
+	u32 val = readl(pll->base + ETH_PLL_CTL0);
+
+	/* Apply both enable an reset */
+	val |= PLL_CTL0_RST | PLL_CTL0_EN;
+	writel(val, pll->base + ETH_PLL_CTL0);
+
+	/* Clear the reset to let PLL lock */
+	val &= ~PLL_CTL0_RST;
+	writel(val, pll->base + ETH_PLL_CTL0);
+
+	/* Poll on the digital lock instead of the usual analog lock
+	 * This is done because bit 31 is unreliable on some SoC. Bit
+	 * 31 may indicate that the PLL is not lock eventhough the clock
+	 * is actually running
+	 */
+	return readl_poll_timeout(pll->base + ETH_PLL_CTL0, val,
+				  val & PLL_CTL0_LOCK_DIG, 0, PLL_LOCK_TIMEOUT);
+}
+
+static void g12a_ephy_pll_disable(struct clk_hw *hw)
+{
+	struct g12a_ephy_pll *pll = g12a_ephy_pll_to_dev(hw);
+	u32 val;
+
+	val = readl(pll->base + ETH_PLL_CTL0);
+	val &= ~PLL_CTL0_EN;
+	val |= PLL_CTL0_RST;
+	writel(val, pll->base + ETH_PLL_CTL0);
+}
+
+static int g12a_ephy_pll_is_enabled(struct clk_hw *hw)
+{
+	struct g12a_ephy_pll *pll = g12a_ephy_pll_to_dev(hw);
+	unsigned int val;
+
+	val = readl(pll->base + ETH_PLL_CTL0);
+
+	return (val & PLL_CTL0_LOCK_DIG) ? 1 : 0;
+}
+
+static void g12a_ephy_pll_init(struct clk_hw *hw)
+{
+	struct g12a_ephy_pll *pll = g12a_ephy_pll_to_dev(hw);
+
+	/* Apply PLL HW settings */
+	writel(0x29c0040a, pll->base + ETH_PLL_CTL0);
+	writel(0x927e0000, pll->base + ETH_PLL_CTL1);
+	writel(0xac5f49e5, pll->base + ETH_PLL_CTL2);
+	writel(0x00000000, pll->base + ETH_PLL_CTL3);
+	writel(0x00000000, pll->base + ETH_PLL_CTL4);
+	writel(0x20200000, pll->base + ETH_PLL_CTL5);
+	writel(0x0000c002, pll->base + ETH_PLL_CTL6);
+	writel(0x00000023, pll->base + ETH_PLL_CTL7);
+}
+
+static const struct clk_ops g12a_ephy_pll_ops = {
+	.recalc_rate	= g12a_ephy_pll_recalc_rate,
+	.is_enabled	= g12a_ephy_pll_is_enabled,
+	.enable		= g12a_ephy_pll_enable,
+	.disable	= g12a_ephy_pll_disable,
+	.init		= g12a_ephy_pll_init,
+};
+
+static int g12a_enable_internal_mdio(struct g12a_mdio_mux *priv)
+{
+	int ret;
+
+	/* Enable the phy clock */
+	if (!priv->pll_is_enabled) {
+		ret = clk_prepare_enable(priv->pll);
+		if (ret)
+			return ret;
+	}
+
+	priv->pll_is_enabled = true;
+
+	/* Initialize ephy control */
+	writel(EPHY_G12A_ID, priv->regs + ETH_PHY_CNTL0);
+	writel(FIELD_PREP(PHY_CNTL1_ST_MODE, 3) |
+	       FIELD_PREP(PHY_CNTL1_ST_PHYADD, EPHY_DFLT_ADD) |
+	       FIELD_PREP(PHY_CNTL1_MII_MODE, EPHY_MODE_RMII) |
+	       PHY_CNTL1_CLK_EN |
+	       PHY_CNTL1_CLKFREQ |
+	       PHY_CNTL1_PHY_ENB,
+	       priv->regs + ETH_PHY_CNTL1);
+	writel(PHY_CNTL2_USE_INTERNAL |
+	       PHY_CNTL2_SMI_SRC_MAC |
+	       PHY_CNTL2_RX_CLK_EPHY,
+	       priv->regs + ETH_PHY_CNTL2);
+
+	return 0;
+}
+
+static int g12a_enable_external_mdio(struct g12a_mdio_mux *priv)
+{
+	/* Reset the mdio bus mux */
+	writel_relaxed(0x0, priv->regs + ETH_PHY_CNTL2);
+
+	/* Disable the phy clock if enabled */
+	if (priv->pll_is_enabled) {
+		clk_disable_unprepare(priv->pll);
+		priv->pll_is_enabled = false;
+	}
+
+	return 0;
+}
+
+static int g12a_mdio_switch_fn(int current_child, int desired_child,
+			       void *data)
+{
+	struct g12a_mdio_mux *priv = dev_get_drvdata(data);
+
+	if (current_child == desired_child)
+		return 0;
+
+	switch (desired_child) {
+	case MESON_G12A_MDIO_EXTERNAL_ID:
+		return g12a_enable_external_mdio(priv);
+	case MESON_G12A_MDIO_INTERNAL_ID:
+		return g12a_enable_internal_mdio(priv);
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct of_device_id g12a_mdio_mux_match[] = {
+	{ .compatible = "amlogic,g12a-mdio-mux", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, g12a_mdio_mux_match);
+
+static int g12a_ephy_glue_clk_register(struct device *dev)
+{
+	struct g12a_mdio_mux *priv = dev_get_drvdata(dev);
+	const char *parent_names[PLL_MUX_NUM_PARENT];
+	struct clk_init_data init;
+	struct g12a_ephy_pll *pll;
+	struct clk_mux *mux;
+	struct clk *clk;
+	char *name;
+	int i;
+
+	/* get the mux parents */
+	for (i = 0; i < PLL_MUX_NUM_PARENT; i++) {
+		char in_name[8];
+
+		snprintf(in_name, sizeof(in_name), "clkin%d", i);
+		clk = devm_clk_get(dev, in_name);
+		if (IS_ERR(clk)) {
+			if (PTR_ERR(clk) != -EPROBE_DEFER)
+				dev_err(dev, "Missing clock %s\n", in_name);
+			return PTR_ERR(clk);
+		}
+
+		parent_names[i] = __clk_get_name(clk);
+	}
+
+	/* create the input mux */
+	mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
+	if (!mux)
+		return -ENOMEM;
+
+	name = kasprintf(GFP_KERNEL, "%s#mux", dev_name(dev));
+	if (!name)
+		return -ENOMEM;
+
+	init.name = name;
+	init.ops = &clk_mux_ro_ops;
+	init.flags = 0;
+	init.parent_names = parent_names;
+	init.num_parents = PLL_MUX_NUM_PARENT;
+
+	mux->reg = priv->regs + ETH_PLL_CTL0;
+	mux->shift = __ffs(PLL_CTL0_SEL);
+	mux->mask = PLL_CTL0_SEL >> mux->shift;
+	mux->hw.init = &init;
+
+	clk = devm_clk_register(dev, &mux->hw);
+	kfree(name);
+	if (IS_ERR(clk)) {
+		dev_err(dev, "failed to register input mux\n");
+		return PTR_ERR(clk);
+	}
+
+	/* create the pll */
+	pll = devm_kzalloc(dev, sizeof(*pll), GFP_KERNEL);
+	if (!pll)
+		return -ENOMEM;
+
+	name = kasprintf(GFP_KERNEL, "%s#pll", dev_name(dev));
+	if (!name)
+		return -ENOMEM;
+
+	init.name = name;
+	init.ops = &g12a_ephy_pll_ops;
+	init.flags = 0;
+	parent_names[0] = __clk_get_name(clk);
+	init.parent_names = parent_names;
+	init.num_parents = 1;
+
+	pll->base = priv->regs;
+	pll->hw.init = &init;
+
+	clk = devm_clk_register(dev, &pll->hw);
+	kfree(name);
+	if (IS_ERR(clk)) {
+		dev_err(dev, "failed to register input mux\n");
+		return PTR_ERR(clk);
+	}
+
+	priv->pll = clk;
+
+	return 0;
+}
+
+static int g12a_mdio_mux_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct g12a_mdio_mux *priv;
+	struct resource *res;
+	int ret;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, priv);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	priv->regs = devm_ioremap_resource(dev, res);
+	if (IS_ERR(priv->regs))
+		return PTR_ERR(priv->regs);
+
+	priv->pclk = devm_clk_get(dev, "pclk");
+	if (IS_ERR(priv->pclk)) {
+		ret = PTR_ERR(priv->pclk);
+		if (ret != -EPROBE_DEFER)
+			dev_err(dev, "failed to get peripheral clock\n");
+		return ret;
+	}
+
+	/* Make sure the device registers are clocked */
+	ret = clk_prepare_enable(priv->pclk);
+	if (ret) {
+		dev_err(dev, "failed to enable peripheral clock");
+		return ret;
+	}
+
+	/* Register PLL in CCF */
+	ret = g12a_ephy_glue_clk_register(dev);
+	if (ret)
+		goto err;
+
+	ret = mdio_mux_init(dev, dev->of_node, g12a_mdio_switch_fn,
+			    &priv->mux_handle, dev, NULL);
+	if (ret) {
+		if (ret != -EPROBE_DEFER)
+			dev_err(dev, "mdio multiplexer init failed: %d", ret);
+		goto err;
+	}
+
+	return 0;
+
+err:
+	clk_disable_unprepare(priv->pclk);
+	return ret;
+}
+
+static int g12a_mdio_mux_remove(struct platform_device *pdev)
+{
+	struct g12a_mdio_mux *priv = platform_get_drvdata(pdev);
+
+	mdio_mux_uninit(priv->mux_handle);
+
+	if (priv->pll_is_enabled)
+		clk_disable_unprepare(priv->pll);
+
+	clk_disable_unprepare(priv->pclk);
+
+	return 0;
+}
+
+static struct platform_driver g12a_mdio_mux_driver = {
+	.probe		= g12a_mdio_mux_probe,
+	.remove		= g12a_mdio_mux_remove,
+	.driver		= {
+		.name	= "g12a-mdio_mux",
+		.of_match_table = g12a_mdio_mux_match,
+	},
+};
+module_platform_driver(g12a_mdio_mux_driver);
+
+MODULE_DESCRIPTION("Amlogic G12a MDIO multiplexer driver");
+MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/net/phy/meson-gxl.c b/drivers/net/phy/meson-gxl.c
index 0eec2913c289..6d4a8c508ec0 100644
--- a/drivers/net/phy/meson-gxl.c
+++ b/drivers/net/phy/meson-gxl.c
@@ -224,24 +224,33 @@ static int meson_gxl_config_intr(struct phy_device *phydev)
 
 static struct phy_driver meson_gxl_phy[] = {
 	{
-		.phy_id		= 0x01814400,
-		.phy_id_mask	= 0xfffffff0,
+		PHY_ID_MATCH_EXACT(0x01814400),
 		.name		= "Meson GXL Internal PHY",
 		.features	= PHY_BASIC_FEATURES,
 		.flags		= PHY_IS_INTERNAL,
 		.soft_reset     = genphy_soft_reset,
 		.config_init	= meson_gxl_config_init,
-		.aneg_done      = genphy_aneg_done,
 		.read_status	= meson_gxl_read_status,
 		.ack_interrupt	= meson_gxl_ack_interrupt,
 		.config_intr	= meson_gxl_config_intr,
 		.suspend        = genphy_suspend,
 		.resume         = genphy_resume,
+	}, {
+		PHY_ID_MATCH_EXACT(0x01803301),
+		.name		= "Meson G12A Internal PHY",
+		.features	= PHY_BASIC_FEATURES,
+		.flags		= PHY_IS_INTERNAL,
+		.soft_reset     = genphy_soft_reset,
+		.ack_interrupt	= meson_gxl_ack_interrupt,
+		.config_intr	= meson_gxl_config_intr,
+		.suspend        = genphy_suspend,
+		.resume         = genphy_resume,
 	},
 };
 
 static struct mdio_device_id __maybe_unused meson_gxl_tbl[] = {
-	{ 0x01814400, 0xfffffff0 },
+	{ PHY_ID_MATCH_VENDOR(0x01814400) },
+	{ PHY_ID_MATCH_VENDOR(0x01803301) },
 	{ }
 };