Merge branch 'phy-icplus-next'

Michael Walle says:

====================
net: phy: icplus: cleanups and new features

Cleanup the PHY drivers for IPplus devices and add PHY counters and MDIX
support for the IP101A/G.

Patch 5 adds a model detection based on the behavior of the PHY.
Unfortunately, the IP101A shares the PHY ID with the IP101G. But the latter
provides more features. Try to detect the newer model by accessing the page
selection register. If it is writeable, it is assumed, that it is a IP101G.

With this detection in place, we can now access registers >= 16 in a
correct way on the IP101G; that is by first selecting the correct page.
This might previouly worked, because no one ever set another active page
before booting linux.

The last two patches add the new features.
===================
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/phy/icplus.c

@@ -37,16 +37,35 @@ MODULE_LICENSE("GPL");
 #define IP1001_SPEC_CTRL_STATUS_2	20	/* IP1001 Spec. Control Reg 2 */
 #define IP1001_APS_ON			11	/* IP1001 APS Mode  bit */
 #define IP101A_G_APS_ON			BIT(1)	/* IP101A/G APS Mode bit */
+#define IP101A_G_AUTO_MDIX_DIS		BIT(11)
 #define IP101A_G_IRQ_CONF_STATUS	0x11	/* Conf Info IRQ & Status Reg */
 #define	IP101A_G_IRQ_PIN_USED		BIT(15) /* INTR pin used */
 #define IP101A_G_IRQ_ALL_MASK		BIT(11) /* IRQ's inactive */
 #define IP101A_G_IRQ_SPEED_CHANGE	BIT(2)
 #define IP101A_G_IRQ_DUPLEX_CHANGE	BIT(1)
 #define IP101A_G_IRQ_LINK_CHANGE	BIT(0)
+#define IP101A_G_PHY_STATUS		18
+#define IP101A_G_MDIX			BIT(9)
+#define IP101A_G_PHY_SPEC_CTRL		30
+#define IP101A_G_FORCE_MDIX		BIT(3)
 
+#define IP101G_PAGE_CONTROL				0x14
+#define IP101G_PAGE_CONTROL_MASK			GENMASK(4, 0)
 #define IP101G_DIGITAL_IO_SPEC_CTRL			0x1d
 #define IP101G_DIGITAL_IO_SPEC_CTRL_SEL_INTR32		BIT(2)
 
+#define IP101G_DEFAULT_PAGE			16
+
+#define IP101G_P1_CNT_CTRL		17
+#define CNT_CTRL_RX_EN			BIT(13)
+#define IP101G_P8_CNT_CTRL		17
+#define CNT_CTRL_RDCLR_EN		BIT(15)
+#define IP101G_CNT_REG			18
+
+#define IP175C_PHY_ID 0x02430d80
+#define IP1001_PHY_ID 0x02430d90
+#define IP101A_PHY_ID 0x02430c54
+
 /* The 32-pin IP101GR package can re-configure the mode of the RXER/INTR_32 pin
  * (pin number 21). The hardware default is RXER (receive error) mode. But it
  * can be configured to interrupt mode manually.
@@ -57,8 +76,19 @@ enum ip101gr_sel_intr32 {
 	IP101GR_SEL_INTR32_RXER,
 };
 
+struct ip101g_hw_stat {
+	const char *name;
+	int page;
+};
+
+static struct ip101g_hw_stat ip101g_hw_stats[] = {
+	{ "phy_crc_errors", 1 },
+	{ "phy_symbol_errors", 11, },
+};
+
 struct ip101a_g_phy_priv {
 	enum ip101gr_sel_intr32 sel_intr32;
+	u64 stats[ARRAY_SIZE(ip101g_hw_stats)];
 };
 
 static int ip175c_config_init(struct phy_device *phydev)
@@ -116,36 +146,10 @@ static int ip175c_config_init(struct phy_device *phydev)
 	return 0;
 }
 
-static int ip1xx_reset(struct phy_device *phydev)
-{
-	int bmcr;
-
-	/* Software Reset PHY */
-	bmcr = phy_read(phydev, MII_BMCR);
-	if (bmcr < 0)
-		return bmcr;
-	bmcr |= BMCR_RESET;
-	bmcr = phy_write(phydev, MII_BMCR, bmcr);
-	if (bmcr < 0)
-		return bmcr;
-
-	do {
-		bmcr = phy_read(phydev, MII_BMCR);
-		if (bmcr < 0)
-			return bmcr;
-	} while (bmcr & BMCR_RESET);
-
-	return 0;
-}
-
 static int ip1001_config_init(struct phy_device *phydev)
 {
 	int c;
 
-	c = ip1xx_reset(phydev);
-	if (c < 0)
-		return c;
-
 	/* Enable Auto Power Saving mode */
 	c = phy_read(phydev, IP1001_SPEC_CTRL_STATUS_2);
 	if (c < 0)
@@ -228,30 +232,30 @@ static int ip101a_g_probe(struct phy_device *phydev)
 	return 0;
 }
 
-static int ip101a_g_config_init(struct phy_device *phydev)
+static int ip101a_g_config_intr_pin(struct phy_device *phydev)
 {
 	struct ip101a_g_phy_priv *priv = phydev->priv;
-	int err, c;
+	int oldpage, err = 0;
 
-	c = ip1xx_reset(phydev);
-	if (c < 0)
-		return c;
+	oldpage = phy_select_page(phydev, IP101G_DEFAULT_PAGE);
+	if (oldpage < 0)
+		return oldpage;
 
 	/* configure the RXER/INTR_32 pin of the 32-pin IP101GR if needed: */
 	switch (priv->sel_intr32) {
 	case IP101GR_SEL_INTR32_RXER:
-		err = phy_modify(phydev, IP101G_DIGITAL_IO_SPEC_CTRL,
+		err = __phy_modify(phydev, IP101G_DIGITAL_IO_SPEC_CTRL,
 				   IP101G_DIGITAL_IO_SPEC_CTRL_SEL_INTR32, 0);
 		if (err < 0)
-			return err;
+			goto out;
 		break;
 
 	case IP101GR_SEL_INTR32_INTR:
-		err = phy_modify(phydev, IP101G_DIGITAL_IO_SPEC_CTRL,
+		err = __phy_modify(phydev, IP101G_DIGITAL_IO_SPEC_CTRL,
 				   IP101G_DIGITAL_IO_SPEC_CTRL_SEL_INTR32,
 				   IP101G_DIGITAL_IO_SPEC_CTRL_SEL_INTR32);
 		if (err < 0)
-			return err;
+			goto out;
 		break;
 
 	default:
@@ -265,17 +269,135 @@ static int ip101a_g_config_init(struct phy_device *phydev)
 		break;
 	}
 
+out:
+	return phy_restore_page(phydev, oldpage, err);
+}
+
+static int ip101a_config_init(struct phy_device *phydev)
+{
+	int ret;
+
 	/* Enable Auto Power Saving mode */
-	c = phy_read(phydev, IP10XX_SPEC_CTRL_STATUS);
-	c |= IP101A_G_APS_ON;
+	ret = phy_set_bits(phydev, IP10XX_SPEC_CTRL_STATUS, IP101A_G_APS_ON);
+	if (ret)
+		return ret;
+
+	return ip101a_g_config_intr_pin(phydev);
+}
+
+static int ip101g_config_init(struct phy_device *phydev)
+{
+	int ret;
+
+	/* Enable the PHY counters */
+	ret = phy_modify_paged(phydev, 1, IP101G_P1_CNT_CTRL,
+			       CNT_CTRL_RX_EN, CNT_CTRL_RX_EN);
+	if (ret)
+		return ret;
+
+	/* Clear error counters on read */
+	ret = phy_modify_paged(phydev, 8, IP101G_P8_CNT_CTRL,
+			       CNT_CTRL_RDCLR_EN, CNT_CTRL_RDCLR_EN);
+	if (ret)
+		return ret;
+
+	return ip101a_g_config_intr_pin(phydev);
+}
+
+static int ip101a_g_read_status(struct phy_device *phydev)
+{
+	int oldpage, ret, stat1, stat2;
+
+	ret = genphy_read_status(phydev);
+	if (ret)
+		return ret;
+
+	oldpage = phy_select_page(phydev, IP101G_DEFAULT_PAGE);
+	if (oldpage < 0)
+		return oldpage;
+
+	ret = __phy_read(phydev, IP10XX_SPEC_CTRL_STATUS);
+	if (ret < 0)
+		goto out;
+	stat1 = ret;
+
+	ret = __phy_read(phydev, IP101A_G_PHY_SPEC_CTRL);
+	if (ret < 0)
+		goto out;
+	stat2 = ret;
+
+	if (stat1 & IP101A_G_AUTO_MDIX_DIS) {
+		if (stat2 & IP101A_G_FORCE_MDIX)
+			phydev->mdix_ctrl = ETH_TP_MDI_X;
+		else
+			phydev->mdix_ctrl = ETH_TP_MDI;
+	} else {
+		phydev->mdix_ctrl = ETH_TP_MDI_AUTO;
+	}
+
+	if (stat2 & IP101A_G_MDIX)
+		phydev->mdix = ETH_TP_MDI_X;
+	else
+		phydev->mdix = ETH_TP_MDI;
+
+	ret = 0;
+
+out:
+	return phy_restore_page(phydev, oldpage, ret);
+}
+
+static int ip101a_g_config_mdix(struct phy_device *phydev)
+{
+	u16 ctrl = 0, ctrl2 = 0;
+	int oldpage, ret;
+
+	switch (phydev->mdix_ctrl) {
+	case ETH_TP_MDI:
+		ctrl = IP101A_G_AUTO_MDIX_DIS;
+		break;
+	case ETH_TP_MDI_X:
+		ctrl = IP101A_G_AUTO_MDIX_DIS;
+		ctrl2 = IP101A_G_FORCE_MDIX;
+		break;
+	case ETH_TP_MDI_AUTO:
+		break;
+	default:
+		return 0;
+	}
+
+	oldpage = phy_select_page(phydev, IP101G_DEFAULT_PAGE);
+	if (oldpage < 0)
+		return oldpage;
+
+	ret = __phy_modify(phydev, IP10XX_SPEC_CTRL_STATUS,
+			   IP101A_G_AUTO_MDIX_DIS, ctrl);
+	if (ret)
+		goto out;
+
+	ret = __phy_modify(phydev, IP101A_G_PHY_SPEC_CTRL,
+			   IP101A_G_FORCE_MDIX, ctrl2);
+
+out:
+	return phy_restore_page(phydev, oldpage, ret);
+}
+
+static int ip101a_g_config_aneg(struct phy_device *phydev)
+{
+	int ret;
+
+	ret = ip101a_g_config_mdix(phydev);
+	if (ret)
+		return ret;
 
-	return phy_write(phydev, IP10XX_SPEC_CTRL_STATUS, c);
+	return genphy_config_aneg(phydev);
 }
 
 static int ip101a_g_ack_interrupt(struct phy_device *phydev)
 {
-	int err = phy_read(phydev, IP101A_G_IRQ_CONF_STATUS);
+	int err;
 
+	err = phy_read_paged(phydev, IP101G_DEFAULT_PAGE,
+			     IP101A_G_IRQ_CONF_STATUS);
 	if (err < 0)
 		return err;
 
@@ -294,10 +416,12 @@ static int ip101a_g_config_intr(struct phy_device *phydev)
 
 		/* INTR pin used: Speed/link/duplex will cause an interrupt */
 		val = IP101A_G_IRQ_PIN_USED;
-		err = phy_write(phydev, IP101A_G_IRQ_CONF_STATUS, val);
+		err = phy_write_paged(phydev, IP101G_DEFAULT_PAGE,
+				      IP101A_G_IRQ_CONF_STATUS, val);
 	} else {
 		val = IP101A_G_IRQ_ALL_MASK;
-		err = phy_write(phydev, IP101A_G_IRQ_CONF_STATUS, val);
+		err = phy_write_paged(phydev, IP101G_DEFAULT_PAGE,
+				      IP101A_G_IRQ_CONF_STATUS, val);
 		if (err)
 			return err;
 
@@ -311,7 +435,8 @@ static irqreturn_t ip101a_g_handle_interrupt(struct phy_device *phydev)
 {
 	int irq_status;
 
-	irq_status = phy_read(phydev, IP101A_G_IRQ_CONF_STATUS);
+	irq_status = phy_read_paged(phydev, IP101G_DEFAULT_PAGE,
+				    IP101A_G_IRQ_CONF_STATUS);
 	if (irq_status < 0) {
 		phy_error(phydev);
 		return IRQ_NONE;
@@ -327,34 +452,171 @@ static irqreturn_t ip101a_g_handle_interrupt(struct phy_device *phydev)
 	return IRQ_HANDLED;
 }
 
+/* The IP101A doesn't really have a page register. We just pretend to have one
+ * so we can use the paged versions of the callbacks of the IP101G.
+ */
+static int ip101a_read_page(struct phy_device *phydev)
+{
+	return IP101G_DEFAULT_PAGE;
+}
+
+static int ip101a_write_page(struct phy_device *phydev, int page)
+{
+	WARN_ONCE(page != IP101G_DEFAULT_PAGE, "wrong page selected\n");
+
+	return 0;
+}
+
+static int ip101g_read_page(struct phy_device *phydev)
+{
+	return __phy_read(phydev, IP101G_PAGE_CONTROL);
+}
+
+static int ip101g_write_page(struct phy_device *phydev, int page)
+{
+	return __phy_write(phydev, IP101G_PAGE_CONTROL, page);
+}
+
+static int ip101a_g_has_page_register(struct phy_device *phydev)
+{
+	int oldval, val, ret;
+
+	oldval = phy_read(phydev, IP101G_PAGE_CONTROL);
+	if (oldval < 0)
+		return oldval;
+
+	ret = phy_write(phydev, IP101G_PAGE_CONTROL, 0xffff);
+	if (ret)
+		return ret;
+
+	val = phy_read(phydev, IP101G_PAGE_CONTROL);
+	if (val < 0)
+		return val;
+
+	ret = phy_write(phydev, IP101G_PAGE_CONTROL, oldval);
+	if (ret)
+		return ret;
+
+	return val == IP101G_PAGE_CONTROL_MASK;
+}
+
+static int ip101a_g_match_phy_device(struct phy_device *phydev, bool ip101a)
+{
+	int ret;
+
+	if (phydev->phy_id != IP101A_PHY_ID)
+		return 0;
+
+	/* The IP101A and the IP101G share the same PHY identifier.The IP101G
+	 * seems to be a successor of the IP101A and implements more functions.
+	 * Amongst other things there is a page select register, which is not
+	 * available on the IP101A. Use this to distinguish these two.
+	 */
+	ret = ip101a_g_has_page_register(phydev);
+	if (ret < 0)
+		return ret;
+
+	return ip101a == !ret;
+}
+
+static int ip101a_match_phy_device(struct phy_device *phydev)
+{
+	return ip101a_g_match_phy_device(phydev, true);
+}
+
+static int ip101g_match_phy_device(struct phy_device *phydev)
+{
+	return ip101a_g_match_phy_device(phydev, false);
+}
+
+static int ip101g_get_sset_count(struct phy_device *phydev)
+{
+	return ARRAY_SIZE(ip101g_hw_stats);
+}
+
+static void ip101g_get_strings(struct phy_device *phydev, u8 *data)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(ip101g_hw_stats); i++)
+		strscpy(data + i * ETH_GSTRING_LEN,
+			ip101g_hw_stats[i].name, ETH_GSTRING_LEN);
+}
+
+static u64 ip101g_get_stat(struct phy_device *phydev, int i)
+{
+	struct ip101g_hw_stat stat = ip101g_hw_stats[i];
+	struct ip101a_g_phy_priv *priv = phydev->priv;
+	int val;
+	u64 ret;
+
+	val = phy_read_paged(phydev, stat.page, IP101G_CNT_REG);
+	if (val < 0) {
+		ret = U64_MAX;
+	} else {
+		priv->stats[i] += val;
+		ret = priv->stats[i];
+	}
+
+	return ret;
+}
+
+static void ip101g_get_stats(struct phy_device *phydev,
+			     struct ethtool_stats *stats, u64 *data)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(ip101g_hw_stats); i++)
+		data[i] = ip101g_get_stat(phydev, i);
+}
+
 static struct phy_driver icplus_driver[] = {
 {
-	.phy_id		= 0x02430d80,
+	PHY_ID_MATCH_MODEL(IP175C_PHY_ID),
 	.name		= "ICPlus IP175C",
-	.phy_id_mask	= 0x0ffffff0,
 	/* PHY_BASIC_FEATURES */
-	.config_init	= &ip175c_config_init,
-	.config_aneg	= &ip175c_config_aneg,
-	.read_status	= &ip175c_read_status,
+	.config_init	= ip175c_config_init,
+	.config_aneg	= ip175c_config_aneg,
+	.read_status	= ip175c_read_status,
 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
 }, {
-	.phy_id		= 0x02430d90,
+	PHY_ID_MATCH_MODEL(IP1001_PHY_ID),
 	.name		= "ICPlus IP1001",
-	.phy_id_mask	= 0x0ffffff0,
 	/* PHY_GBIT_FEATURES */
-	.config_init	= &ip1001_config_init,
+	.config_init	= ip1001_config_init,
+	.soft_reset	= genphy_soft_reset,
 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
 }, {
-	.phy_id		= 0x02430c54,
-	.name		= "ICPlus IP101A/G",
-	.phy_id_mask	= 0x0ffffff0,
-	/* PHY_BASIC_FEATURES */
+	.name		= "ICPlus IP101A",
+	.match_phy_device = ip101a_match_phy_device,
+	.probe		= ip101a_g_probe,
+	.read_page	= ip101a_read_page,
+	.write_page	= ip101a_write_page,
+	.config_intr	= ip101a_g_config_intr,
+	.handle_interrupt = ip101a_g_handle_interrupt,
+	.config_init	= ip101a_config_init,
+	.config_aneg	= ip101a_g_config_aneg,
+	.read_status	= ip101a_g_read_status,
+	.soft_reset	= genphy_soft_reset,
+	.suspend	= genphy_suspend,
+	.resume		= genphy_resume,
+}, {
+	.name		= "ICPlus IP101G",
+	.match_phy_device = ip101g_match_phy_device,
 	.probe		= ip101a_g_probe,
+	.read_page	= ip101g_read_page,
+	.write_page	= ip101g_write_page,
 	.config_intr	= ip101a_g_config_intr,
 	.handle_interrupt = ip101a_g_handle_interrupt,
-	.config_init	= &ip101a_g_config_init,
+	.config_init	= ip101g_config_init,
+	.config_aneg	= ip101a_g_config_aneg,
+	.read_status	= ip101a_g_read_status,
+	.soft_reset	= genphy_soft_reset,
+	.get_sset_count = ip101g_get_sset_count,
+	.get_strings	= ip101g_get_strings,
+	.get_stats	= ip101g_get_stats,
 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
 } };
@@ -362,9 +624,9 @@ static struct phy_driver icplus_driver[] = {
 module_phy_driver(icplus_driver);
 
 static struct mdio_device_id __maybe_unused icplus_tbl[] = {
-	{ 0x02430d80, 0x0ffffff0 },
-	{ 0x02430d90, 0x0ffffff0 },
-	{ 0x02430c54, 0x0ffffff0 },
+	{ PHY_ID_MATCH_MODEL(IP175C_PHY_ID) },
+	{ PHY_ID_MATCH_MODEL(IP1001_PHY_ID) },
+	{ PHY_ID_MATCH_EXACT(IP101A_PHY_ID) },
 	{ }
 };