net: phy: micrel: Separate KSZ9000 drivers from KSZ8000 drivers

The KS8721BL and KSZ9021 PHYs are software-incompatible, yet they
share the same ID. Drivers for bothe PHYs cannot safely coexist, so
the solution was to use #ifdefs to select between the two drivers.

As a result KSZ9031, which has a unique ID, is now caught in the
crossfire. Unless CONFIG_PHY_MICREL_KSZ9031 is defined, the KSZ9031
will not function properly, as some essential configuration code is
ifdef'd-out.

To prevent such situations, move the KSZ9000 drivers to a separate
file, and place them under a separate Kconfig option. While it is
possible to enable both KSZ8000 and KSZ9000 drivers at the same time,
the assumption is that it is highly unlikely for a system to contain
both a KSZ8000 and a KSZ9000 PHY, and that only one of the drivers
will be enabled at any given time.

Signed-off-by: Alexandru Gagniuc <alex.g@adaptrum.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

5 files changed, 406 insertions, 7 deletions

diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 1afd809..aecf7ed 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -69,6 +69,7 @@ if PHY_MICREL
 config PHY_MICREL_KSZ9021
 	bool "Micrel KSZ9021 family support"
 	select PHY_GIGE
+	select PHY_MICREL_KSZ90X1
 	help
 	  Enable support for the Micrel KSZ9021 GbE PHY family.  If
 	  enabled, the extended register read/write for KSZ9021 PHYs
@@ -80,9 +81,12 @@ config PHY_MICREL_KSZ9021
 	  KSZ8921BL, so enabling this option disables support for the
 	  KSZ8721BL.
 
+	  Deprecated. Use PHY_MICREL_KSZ90X1 instead.
+
 config PHY_MICREL_KSZ9031
 	bool "Micrel KSZ9031 family support"
 	select PHY_GIGE
+	select PHY_MICREL_KSZ90X1
 	help
 	  Enable support for the Micrel KSZ9031 GbE PHY family.  If
 	  enabled, the extended register read/write for KSZ9021 PHYs
@@ -90,6 +94,32 @@ config PHY_MICREL_KSZ9031
 	  delays configured in the device tree will be applied to the
 	  PHY during initialisatioin.
 
+	  Deprecated. Use PHY_MICREL_KSZ90X1 instead.
+
+config PHY_MICREL_KSZ90X1
+	bool "Micrel KSZ90x1 family support"
+	select PHY_GIGE
+	help
+	  Enable support for the Micrel KSZ9021 and KSZ9031 GbE PHYs. If
+	  enabled, the extended register read/write for KSZ90x1 PHYs
+	  is supported through the 'mdio' command and any RGMII signal
+	  delays configured in the device tree will be applied to the
+	  PHY during initialization.
+
+	  This should not be enabled at the same time with PHY_MICREL_KSZ8XXX
+	  as the KSZ9021 and KS8721 share the same ID.
+
+config PHY_MICREL_KSZ8XXX
+	bool "Micrel KSZ8xxx family support"
+	default y if !PHY_MICREL_KSZ90X1
+	help
+	  Enable support for the 8000 series GbE PHYs manufactured by Micrel
+	  (now a part of Microchip). This includes drivers for the KSZ804,
+	  KSZ8031, KSZ8051, KSZ8081, KSZ8895, KSZ886x, and KSZ8721.
+
+	  This should not be enabled at the same time with PHY_MICREL_KSZ90X1
+	  as the KSZ9021 and KS8721 share the same ID.
+
 endif # PHY_MICREL
 
 config PHY_MSCC
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index 88c00a5..54f32f6 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -19,7 +19,8 @@ obj-$(CONFIG_PHY_DAVICOM) += davicom.o
 obj-$(CONFIG_PHY_ET1011C) += et1011c.o
 obj-$(CONFIG_PHY_LXT) += lxt.o
 obj-$(CONFIG_PHY_MARVELL) += marvell.o
-obj-$(CONFIG_PHY_MICREL) += micrel.o
+obj-$(CONFIG_PHY_MICREL_KSZ8XXX) += micrel_ksz8xxx.o
+obj-$(CONFIG_PHY_MICREL_KSZ90X1) += micrel_ksz90x1.o
 obj-$(CONFIG_PHY_NATSEMI) += natsemi.o
 obj-$(CONFIG_PHY_REALTEK) += realtek.o
 obj-$(CONFIG_PHY_SMSC) += smsc.o
diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel_ksz8xxx.c
index 0e4a4eb..552592b 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel_ksz8xxx.c
@@ -365,7 +365,8 @@ static int ksz9021_config(struct phy_device *phydev)
 		ctrl1000 |= ADVERTISE_1000HALF | master;
 	if (features & SUPPORTED_1000baseT_Full)
 		ctrl1000 |= ADVERTISE_1000FULL | master;
-	phydev->advertising = phydev->supported = features;
+	phydev->advertising = features;
+	phydev->supported = features;
 	phy_write(phydev, MDIO_DEVAD_NONE, MII_CTRL1000, ctrl1000);
 	genphy_config_aneg(phydev);
 	genphy_restart_aneg(phydev);
@@ -479,14 +480,14 @@ static int ksz9031_phy_extread(struct phy_device *phydev, int addr, int devaddr,
 {
 	return ksz9031_phy_extended_read(phydev, devaddr, regnum,
 					 MII_KSZ9031_MOD_DATA_NO_POST_INC);
-};
+}
 
 static int ksz9031_phy_extwrite(struct phy_device *phydev, int addr,
 				int devaddr, int regnum, u16 val)
 {
 	return ksz9031_phy_extended_write(phydev, devaddr, regnum,
 					 MII_KSZ9031_MOD_DATA_POST_INC_RW, val);
-};
+}
 
 static int ksz9031_config(struct phy_device *phydev)
 {
@@ -537,7 +538,7 @@ static struct phy_driver ksz886x_driver = {
 	.shutdown = &genphy_shutdown,
 };
 
-int phy_micrel_init(void)
+int phy_micrel_ksz8xxx_init(void)
 {
 	phy_register(&KSZ804_driver);
 	phy_register(&KSZ8031_driver);
diff --git a/drivers/net/phy/micrel_ksz90x1.c b/drivers/net/phy/micrel_ksz90x1.c
new file mode 100644
index 0000000..785143d
--- /dev/null
+++ b/drivers/net/phy/micrel_ksz90x1.c
@@ -0,0 +1,364 @@
+/*
+ * Micrel PHY drivers
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ * Copyright 2010-2011 Freescale Semiconductor, Inc.
+ * author Andy Fleming
+ * (C) 2012 NetModule AG, David Andrey, added KSZ9031
+ * (C) Copyright 2017 Adaptrum, Inc.
+ * Written by Alexandru Gagniuc <alex.g@adaptrum.com> for Adaptrum, Inc.
+ */
+#include <config.h>
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <fdtdec.h>
+#include <micrel.h>
+#include <phy.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * KSZ9021 - KSZ9031 common
+ */
+
+#define MII_KSZ90xx_PHY_CTL		0x1f
+#define MIIM_KSZ90xx_PHYCTL_1000	(1 << 6)
+#define MIIM_KSZ90xx_PHYCTL_100		(1 << 5)
+#define MIIM_KSZ90xx_PHYCTL_10		(1 << 4)
+#define MIIM_KSZ90xx_PHYCTL_DUPLEX	(1 << 3)
+
+/* KSZ9021 PHY Registers */
+#define MII_KSZ9021_EXTENDED_CTRL	0x0b
+#define MII_KSZ9021_EXTENDED_DATAW	0x0c
+#define MII_KSZ9021_EXTENDED_DATAR	0x0d
+
+#define CTRL1000_PREFER_MASTER		(1 << 10)
+#define CTRL1000_CONFIG_MASTER		(1 << 11)
+#define CTRL1000_MANUAL_CONFIG		(1 << 12)
+
+/* KSZ9031 PHY Registers */
+#define MII_KSZ9031_MMD_ACCES_CTRL	0x0d
+#define MII_KSZ9031_MMD_REG_DATA	0x0e
+
+static int ksz90xx_startup(struct phy_device *phydev)
+{
+	unsigned phy_ctl;
+	int ret;
+
+	ret = genphy_update_link(phydev);
+	if (ret)
+		return ret;
+
+	phy_ctl = phy_read(phydev, MDIO_DEVAD_NONE, MII_KSZ90xx_PHY_CTL);
+
+	if (phy_ctl & MIIM_KSZ90xx_PHYCTL_DUPLEX)
+		phydev->duplex = DUPLEX_FULL;
+	else
+		phydev->duplex = DUPLEX_HALF;
+
+	if (phy_ctl & MIIM_KSZ90xx_PHYCTL_1000)
+		phydev->speed = SPEED_1000;
+	else if (phy_ctl & MIIM_KSZ90xx_PHYCTL_100)
+		phydev->speed = SPEED_100;
+	else if (phy_ctl & MIIM_KSZ90xx_PHYCTL_10)
+		phydev->speed = SPEED_10;
+	return 0;
+}
+
+/* Common OF config bits for KSZ9021 and KSZ9031 */
+#ifdef CONFIG_DM_ETH
+struct ksz90x1_reg_field {
+	const char	*name;
+	const u8	size;	/* Size of the bitfield, in bits */
+	const u8	off;	/* Offset from bit 0 */
+	const u8	dflt;	/* Default value */
+};
+
+struct ksz90x1_ofcfg {
+	const u16			reg;
+	const u16			devad;
+	const struct ksz90x1_reg_field	*grp;
+	const u16			grpsz;
+};
+
+static const struct ksz90x1_reg_field ksz90x1_rxd_grp[] = {
+	{ "rxd0-skew-ps", 4, 0, 0x7 }, { "rxd1-skew-ps", 4, 4, 0x7 },
+	{ "rxd2-skew-ps", 4, 8, 0x7 }, { "rxd3-skew-ps", 4, 12, 0x7 }
+};
+
+static const struct ksz90x1_reg_field ksz90x1_txd_grp[] = {
+	{ "txd0-skew-ps", 4, 0, 0x7 }, { "txd1-skew-ps", 4, 4, 0x7 },
+	{ "txd2-skew-ps", 4, 8, 0x7 }, { "txd3-skew-ps", 4, 12, 0x7 },
+};
+
+static const struct ksz90x1_reg_field ksz9021_clk_grp[] = {
+	{ "txen-skew-ps", 4, 0, 0x7 }, { "txc-skew-ps", 4, 4, 0x7 },
+	{ "rxdv-skew-ps", 4, 8, 0x7 }, { "rxc-skew-ps", 4, 12, 0x7 },
+};
+
+static const struct ksz90x1_reg_field ksz9031_ctl_grp[] = {
+	{ "txen-skew-ps", 4, 0, 0x7 }, { "rxdv-skew-ps", 4, 4, 0x7 }
+};
+
+static const struct ksz90x1_reg_field ksz9031_clk_grp[] = {
+	{ "rxc-skew-ps", 5, 0, 0xf }, { "txc-skew-ps", 5, 5, 0xf }
+};
+
+static int ksz90x1_of_config_group(struct phy_device *phydev,
+				   struct ksz90x1_ofcfg *ofcfg)
+{
+	struct udevice *dev = phydev->dev;
+	struct phy_driver *drv = phydev->drv;
+	const int ps_to_regval = 60;
+	int val[4];
+	int i, changed = 0, offset, max;
+	u16 regval = 0;
+
+	if (!drv || !drv->writeext)
+		return -EOPNOTSUPP;
+
+	for (i = 0; i < ofcfg->grpsz; i++) {
+		val[i] = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev),
+					 ofcfg->grp[i].name, -1);
+		offset = ofcfg->grp[i].off;
+		if (val[i] == -1) {
+			/* Default register value for KSZ9021 */
+			regval |= ofcfg->grp[i].dflt << offset;
+		} else {
+			changed = 1;	/* Value was changed in OF */
+			/* Calculate the register value and fix corner cases */
+			if (val[i] > ps_to_regval * 0xf) {
+				max = (1 << ofcfg->grp[i].size) - 1;
+				regval |= max << offset;
+			} else {
+				regval |= (val[i] / ps_to_regval) << offset;
+			}
+		}
+	}
+
+	if (!changed)
+		return 0;
+
+	return drv->writeext(phydev, 0, ofcfg->devad, ofcfg->reg, regval);
+}
+
+static int ksz9021_of_config(struct phy_device *phydev)
+{
+	struct ksz90x1_ofcfg ofcfg[] = {
+		{ MII_KSZ9021_EXT_RGMII_RX_DATA_SKEW, 0, ksz90x1_rxd_grp, 4 },
+		{ MII_KSZ9021_EXT_RGMII_TX_DATA_SKEW, 0, ksz90x1_txd_grp, 4 },
+		{ MII_KSZ9021_EXT_RGMII_CLOCK_SKEW, 0, ksz9021_clk_grp, 4 },
+	};
+	int i, ret = 0;
+
+	for (i = 0; i < ARRAY_SIZE(ofcfg); i++) {
+		ret = ksz90x1_of_config_group(phydev, &(ofcfg[i]));
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int ksz9031_of_config(struct phy_device *phydev)
+{
+	struct ksz90x1_ofcfg ofcfg[] = {
+		{ MII_KSZ9031_EXT_RGMII_CTRL_SIG_SKEW, 2, ksz9031_ctl_grp, 2 },
+		{ MII_KSZ9031_EXT_RGMII_RX_DATA_SKEW, 2, ksz90x1_rxd_grp, 4 },
+		{ MII_KSZ9031_EXT_RGMII_TX_DATA_SKEW, 2, ksz90x1_txd_grp, 4 },
+		{ MII_KSZ9031_EXT_RGMII_CLOCK_SKEW, 2, ksz9031_clk_grp, 2 },
+	};
+	int i, ret = 0;
+
+	for (i = 0; i < ARRAY_SIZE(ofcfg); i++) {
+		ret = ksz90x1_of_config_group(phydev, &(ofcfg[i]));
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int ksz9031_center_flp_timing(struct phy_device *phydev)
+{
+	struct phy_driver *drv = phydev->drv;
+	int ret = 0;
+
+	if (!drv || !drv->writeext)
+		return -EOPNOTSUPP;
+
+	ret = drv->writeext(phydev, 0, 0, MII_KSZ9031_FLP_BURST_TX_LO, 0x1A80);
+	if (ret)
+		return ret;
+
+	ret = drv->writeext(phydev, 0, 0, MII_KSZ9031_FLP_BURST_TX_HI, 0x6);
+	return ret;
+}
+
+#else /* !CONFIG_DM_ETH */
+static int ksz9021_of_config(struct phy_device *phydev)
+{
+	return 0;
+}
+
+static int ksz9031_of_config(struct phy_device *phydev)
+{
+	return 0;
+}
+
+static int ksz9031_center_flp_timing(struct phy_device *phydev)
+{
+	return 0;
+}
+#endif
+
+/*
+ * KSZ9021
+ */
+int ksz9021_phy_extended_write(struct phy_device *phydev, int regnum, u16 val)
+{
+	/* extended registers */
+	phy_write(phydev, MDIO_DEVAD_NONE,
+		  MII_KSZ9021_EXTENDED_CTRL, regnum | 0x8000);
+	return phy_write(phydev, MDIO_DEVAD_NONE,
+			 MII_KSZ9021_EXTENDED_DATAW, val);
+}
+
+int ksz9021_phy_extended_read(struct phy_device *phydev, int regnum)
+{
+	/* extended registers */
+	phy_write(phydev, MDIO_DEVAD_NONE, MII_KSZ9021_EXTENDED_CTRL, regnum);
+	return phy_read(phydev, MDIO_DEVAD_NONE, MII_KSZ9021_EXTENDED_DATAR);
+}
+
+
+static int ksz9021_phy_extread(struct phy_device *phydev, int addr, int devaddr,
+			       int regnum)
+{
+	return ksz9021_phy_extended_read(phydev, regnum);
+}
+
+static int ksz9021_phy_extwrite(struct phy_device *phydev, int addr,
+				int devaddr, int regnum, u16 val)
+{
+	return ksz9021_phy_extended_write(phydev, regnum, val);
+}
+
+static int ksz9021_config(struct phy_device *phydev)
+{
+	unsigned ctrl1000 = 0;
+	const unsigned master = CTRL1000_PREFER_MASTER |
+	CTRL1000_CONFIG_MASTER | CTRL1000_MANUAL_CONFIG;
+	unsigned features = phydev->drv->features;
+	int ret;
+
+	ret = ksz9021_of_config(phydev);
+	if (ret)
+		return ret;
+
+	if (getenv("disable_giga"))
+		features &= ~(SUPPORTED_1000baseT_Half |
+		SUPPORTED_1000baseT_Full);
+	/* force master mode for 1000BaseT due to chip errata */
+	if (features & SUPPORTED_1000baseT_Half)
+		ctrl1000 |= ADVERTISE_1000HALF | master;
+	if (features & SUPPORTED_1000baseT_Full)
+		ctrl1000 |= ADVERTISE_1000FULL | master;
+	phydev->advertising = features;
+	phydev->supported = features;
+	phy_write(phydev, MDIO_DEVAD_NONE, MII_CTRL1000, ctrl1000);
+	genphy_config_aneg(phydev);
+	genphy_restart_aneg(phydev);
+	return 0;
+}
+
+static struct phy_driver ksz9021_driver = {
+	.name = "Micrel ksz9021",
+	.uid  = 0x221610,
+	.mask = 0xfffff0,
+	.features = PHY_GBIT_FEATURES,
+	.config = &ksz9021_config,
+	.startup = &ksz90xx_startup,
+	.shutdown = &genphy_shutdown,
+	.writeext = &ksz9021_phy_extwrite,
+	.readext = &ksz9021_phy_extread,
+};
+
+/*
+ * KSZ9031
+ */
+int ksz9031_phy_extended_write(struct phy_device *phydev,
+			       int devaddr, int regnum, u16 mode, u16 val)
+{
+	/*select register addr for mmd*/
+	phy_write(phydev, MDIO_DEVAD_NONE,
+		  MII_KSZ9031_MMD_ACCES_CTRL, devaddr);
+	/*select register for mmd*/
+	phy_write(phydev, MDIO_DEVAD_NONE,
+		  MII_KSZ9031_MMD_REG_DATA, regnum);
+	/*setup mode*/
+	phy_write(phydev, MDIO_DEVAD_NONE,
+		  MII_KSZ9031_MMD_ACCES_CTRL, (mode | devaddr));
+	/*write the value*/
+	return	phy_write(phydev, MDIO_DEVAD_NONE,
+			  MII_KSZ9031_MMD_REG_DATA, val);
+}
+
+int ksz9031_phy_extended_read(struct phy_device *phydev, int devaddr,
+			      int regnum, u16 mode)
+{
+	phy_write(phydev, MDIO_DEVAD_NONE,
+		  MII_KSZ9031_MMD_ACCES_CTRL, devaddr);
+	phy_write(phydev, MDIO_DEVAD_NONE,
+		  MII_KSZ9031_MMD_REG_DATA, regnum);
+	phy_write(phydev, MDIO_DEVAD_NONE,
+		  MII_KSZ9031_MMD_ACCES_CTRL, (devaddr | mode));
+	return phy_read(phydev, MDIO_DEVAD_NONE, MII_KSZ9031_MMD_REG_DATA);
+}
+
+static int ksz9031_phy_extread(struct phy_device *phydev, int addr, int devaddr,
+			       int regnum)
+{
+	return ksz9031_phy_extended_read(phydev, devaddr, regnum,
+					 MII_KSZ9031_MOD_DATA_NO_POST_INC);
+}
+
+static int ksz9031_phy_extwrite(struct phy_device *phydev, int addr,
+				int devaddr, int regnum, u16 val)
+{
+	return ksz9031_phy_extended_write(phydev, devaddr, regnum,
+					  MII_KSZ9031_MOD_DATA_POST_INC_RW, val);
+}
+
+static int ksz9031_config(struct phy_device *phydev)
+{
+	int ret;
+	ret = ksz9031_of_config(phydev);
+	if (ret)
+		return ret;
+	ret = ksz9031_center_flp_timing(phydev);
+	if (ret)
+		return ret;
+	return genphy_config(phydev);
+}
+
+static struct phy_driver ksz9031_driver = {
+	.name = "Micrel ksz9031",
+	.uid  = 0x221620,
+	.mask = 0xfffff0,
+	.features = PHY_GBIT_FEATURES,
+	.config   = &ksz9031_config,
+	.startup  = &ksz90xx_startup,
+	.shutdown = &genphy_shutdown,
+	.writeext = &ksz9031_phy_extwrite,
+	.readext = &ksz9031_phy_extread,
+};
+
+int phy_micrel_ksz90x1_init(void)
+{
+	phy_register(&ksz9021_driver);
+	phy_register(&ksz9031_driver);
+	return 0;
+}
diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index 97e0bc0..5be51d7 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -488,8 +488,11 @@ int phy_init(void)
 #ifdef CONFIG_PHY_MARVELL
 	phy_marvell_init();
 #endif
-#ifdef CONFIG_PHY_MICREL
-	phy_micrel_init();
+#ifdef CONFIG_PHY_MICREL_KSZ8XXX
+	phy_micrel_ksz8xxx_init();
+#endif
+#ifdef CONFIG_PHY_MICREL_KSZ90X1
+	phy_micrel_ksz90x1_init();
 #endif
 #ifdef CONFIG_PHY_NATSEMI
 	phy_natsemi_init();