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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Ahmad Fatoum <a.fatoum@pengutronix.de>
Subject: [PATCH 2/2] net: designware: eqos: mimic Linux gmac4 mdio_{read, write}
Date: Wed, 26 Feb 2020 13:40:17 +0100	[thread overview]
Message-ID: <20200226124017.24646-2-a.fatoum@pengutronix.de> (raw)
In-Reply-To: <20200226124017.24646-1-a.fatoum@pengutronix.de>

The code was ported over from U-Boot and has some things different than
the Kernel driver:

- It reads ->mdio_address, but the kernel driver doesn't
- It doesn't write ->mdio_data in a read, but the kernel driver does
- It has delays in addition to spinning on MII_BUSY, but the kernel driver
  doesn't

Adopt the same flow as used by the kernel.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 drivers/net/designware_eqos.c     | 25 +++++++------------------
 drivers/net/designware_eqos.h     |  1 -
 drivers/net/designware_stm32.c    |  1 -
 drivers/net/designware_tegra186.c |  1 -
 4 files changed, 7 insertions(+), 21 deletions(-)

diff --git a/drivers/net/designware_eqos.c b/drivers/net/designware_eqos.c
index acb4b955464d..cb52f3942d86 100644
--- a/drivers/net/designware_eqos.c
+++ b/drivers/net/designware_eqos.c
@@ -199,7 +199,7 @@ static int eqos_mdio_wait_idle(struct eqos *eqos)
 static int eqos_mdio_read(struct mii_bus *bus, int addr, int reg)
 {
 	struct eqos *eqos = bus->priv;
-	u32 miiaddr;
+	u32 miiaddr = MII_BUSY;
 	int ret;
 
 	ret = eqos_mdio_wait_idle(eqos);
@@ -208,18 +208,13 @@ static int eqos_mdio_read(struct mii_bus *bus, int addr, int reg)
 		return ret;
 	}
 
-	miiaddr = readl(&eqos->mac_regs->mdio_address);
-	miiaddr &= EQOS_MDIO_ADDR_SKAP | EQOS_MDIO_ADDR_C45E;
-	miiaddr |= EQOS_MDIO_ADDR_GOC_READ << EQOS_MDIO_ADDR_GOC_SHIFT;
-
-	miiaddr |= EQOS_MDIO_CLK_CSR(eqos->ops->clk_csr);
 	miiaddr |= EQOS_MDIO_ADDR(addr) | EQOS_MDIO_REG(reg);
-	miiaddr |= MII_BUSY;
+	miiaddr |= EQOS_MDIO_CLK_CSR(eqos->ops->clk_csr);
+	miiaddr |= EQOS_MDIO_ADDR_GOC_READ << EQOS_MDIO_ADDR_GOC_SHIFT;
 
+	writel(0, &eqos->mac_regs->mdio_data);
 	writel(miiaddr, &eqos->mac_regs->mdio_address);
 
-	udelay(eqos->ops->mdio_wait_us);
-
 	ret = eqos_mdio_wait_idle(eqos);
 	if (ret) {
 		dev_err(&bus->dev, "MDIO read didn't complete\n");
@@ -232,7 +227,7 @@ static int eqos_mdio_read(struct mii_bus *bus, int addr, int reg)
 static int eqos_mdio_write(struct mii_bus *bus, int addr, int reg, u16 data)
 {
 	struct eqos *eqos = bus->priv;
-	u32 miiaddr = 0;
+	u32 miiaddr = MII_BUSY;
 	int ret;
 
 	ret = eqos_mdio_wait_idle(eqos);
@@ -241,19 +236,13 @@ static int eqos_mdio_write(struct mii_bus *bus, int addr, int reg, u16 data)
 		return ret;
 	}
 
-	miiaddr = readl(&eqos->mac_regs->mdio_address);
-	miiaddr &= EQOS_MDIO_ADDR_SKAP | EQOS_MDIO_ADDR_C45E;
-	miiaddr |= EQOS_MDIO_ADDR_GOC_WRITE << EQOS_MDIO_ADDR_GOC_SHIFT;
-
-	miiaddr |= EQOS_MDIO_CLK_CSR(eqos->ops->clk_csr);
 	miiaddr |= EQOS_MDIO_ADDR(addr) | EQOS_MDIO_REG(reg);
-	miiaddr |= MII_BUSY;
+	miiaddr |= EQOS_MDIO_CLK_CSR(eqos->ops->clk_csr);
+	miiaddr |= EQOS_MDIO_ADDR_GOC_WRITE << EQOS_MDIO_ADDR_GOC_SHIFT;
 
 	writel(data, &eqos->mac_regs->mdio_data);
 	writel(miiaddr, &eqos->mac_regs->mdio_address);
 
-	udelay(eqos->ops->mdio_wait_us);
-
 	ret = eqos_mdio_wait_idle(eqos);
 	if (ret)
 		dev_err(&bus->dev, "MDIO read didn't complete\n");
diff --git a/drivers/net/designware_eqos.h b/drivers/net/designware_eqos.h
index f794195db4a1..30f4f0257946 100644
--- a/drivers/net/designware_eqos.h
+++ b/drivers/net/designware_eqos.h
@@ -17,7 +17,6 @@ struct eqos_ops {
 	unsigned long (*get_csr_clk_rate)(struct eqos *);
 
 	bool enh_desc;
-	int mdio_wait_us;
 
 #define EQOS_MAC_RXQ_CTRL0_RXQ0EN_SHIFT		0
 #define EQOS_MAC_RXQ_CTRL0_RXQ0EN_MASK		3
diff --git a/drivers/net/designware_stm32.c b/drivers/net/designware_stm32.c
index 1e0cdfa6952f..2e2af8942d1c 100644
--- a/drivers/net/designware_stm32.c
+++ b/drivers/net/designware_stm32.c
@@ -180,7 +180,6 @@ static struct eqos_ops stm32_ops = {
 	.adjust_link = eqos_adjust_link,
 	.get_csr_clk_rate = eqos_get_csr_clk_rate_stm32,
 
-	.mdio_wait_us = 10 * USEC_PER_MSEC,
 	.clk_csr = EQOS_MDIO_ADDR_CR_250_300,
 	.config_mac = EQOS_MAC_RXQ_CTRL0_RXQ0EN_ENABLED_AV,
 };
diff --git a/drivers/net/designware_tegra186.c b/drivers/net/designware_tegra186.c
index 20521db1c711..5348f65c4146 100644
--- a/drivers/net/designware_tegra186.c
+++ b/drivers/net/designware_tegra186.c
@@ -280,7 +280,6 @@ static const struct eqos_ops tegra186_ops = {
 	.adjust_link = eqos_adjust_link_tegra186,
 	.get_csr_clk_rate = eqos_get_csr_clk_rate_tegra186,
 
-	.mdio_wait_us = 10,
 	.clk_csr = EQOS_MDIO_ADDR_CR_20_35,
 	.config_mac = EQOS_MAC_RXQ_CTRL0_RXQ0EN_ENABLED_DCB,
 };
-- 
2.25.0


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  reply	other threads:[~2020-02-26 12:40 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-26 12:40 [PATCH 1/2] net: designware: eqos: remove left-over PHY quirk work around Ahmad Fatoum
2020-02-26 12:40 ` Ahmad Fatoum [this message]
2020-03-02  7:11 ` Sascha Hauer

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