[PATCH v4] net: phy: add driver for Motorcomm yt8511 phy
From: Peter Geis
Date: Thu May 20 2021 - 12:32:44 EST
Add a driver for the Motorcomm yt8511 phy that will be used in the
production Pine64 rk3566-quartz64 development board.
It supports gigabit transfer speeds, rgmii, and 125mhz clk output.
Signed-off-by: Peter Geis <pgwipeout@xxxxxxxxx>
---
Changes v4:
- Set fast ethernet delays as well
- Use __phy_modify for delay setting
- Enable PLL in sleep instead of disabling sleep
- Don't set genphy functions that are defaults
- Tested downshift and duplex detection
Changes v3:
- Add rgmii mode selection support
Changes v2:
- Change to __phy_modify
- Handle return errors
- Remove unnecessary &
MAINTAINERS | 6 ++
drivers/net/phy/Kconfig | 6 ++
drivers/net/phy/Makefile | 1 +
drivers/net/phy/motorcomm.c | 136 ++++++++++++++++++++++++++++++++++++
4 files changed, 149 insertions(+)
create mode 100644 drivers/net/phy/motorcomm.c
diff --git a/MAINTAINERS b/MAINTAINERS
index 601b5ae0368a..2a2e406238fc 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12388,6 +12388,12 @@ F: Documentation/userspace-api/media/drivers/meye*
F: drivers/media/pci/meye/
F: include/uapi/linux/meye.h
+MOTORCOMM PHY DRIVER
+M: Peter Geis <pgwipeout@xxxxxxxxx>
+L: netdev@xxxxxxxxxxxxxxx
+S: Maintained
+F: drivers/net/phy/motorcomm.c
+
MOXA SMARTIO/INDUSTIO/INTELLIO SERIAL CARD
S: Orphan
F: Documentation/driver-api/serial/moxa-smartio.rst
diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 288bf405ebdb..16db9f8037b5 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -229,6 +229,12 @@ config MICROSEMI_PHY
help
Currently supports VSC8514, VSC8530, VSC8531, VSC8540 and VSC8541 PHYs
+config MOTORCOMM_PHY
+ tristate "Motorcomm PHYs"
+ help
+ Enables support for Motorcomm network PHYs.
+ Currently supports the YT8511 gigabit PHY.
+
config NATIONAL_PHY
tristate "National Semiconductor PHYs"
help
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index bcda7ed2455d..37ffbc6e3c87 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -70,6 +70,7 @@ obj-$(CONFIG_MICREL_PHY) += micrel.o
obj-$(CONFIG_MICROCHIP_PHY) += microchip.o
obj-$(CONFIG_MICROCHIP_T1_PHY) += microchip_t1.o
obj-$(CONFIG_MICROSEMI_PHY) += mscc/
+obj-$(CONFIG_MOTORCOMM_PHY) += motorcomm.o
obj-$(CONFIG_NATIONAL_PHY) += national.o
obj-$(CONFIG_NXP_C45_TJA11XX_PHY) += nxp-c45-tja11xx.o
obj-$(CONFIG_NXP_TJA11XX_PHY) += nxp-tja11xx.o
diff --git a/drivers/net/phy/motorcomm.c b/drivers/net/phy/motorcomm.c
new file mode 100644
index 000000000000..796b68f4b499
--- /dev/null
+++ b/drivers/net/phy/motorcomm.c
@@ -0,0 +1,136 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Driver for Motorcomm PHYs
+ *
+ * Author: Peter Geis <pgwipeout@xxxxxxxxx>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/phy.h>
+
+#define PHY_ID_YT8511 0x0000010a
+
+#define YT8511_PAGE_SELECT 0x1e
+#define YT8511_PAGE 0x1f
+#define YT8511_EXT_CLK_GATE 0x0c
+#define YT8511_EXT_DELAY_DRIVE 0x0d
+#define YT8511_EXT_SLEEP_CTRL 0x27
+
+/* 2b00 25m from pll
+ * 2b01 25m from xtl *default*
+ * 2b10 62.m from pll
+ * 2b11 125m from pll
+ */
+#define YT8511_CLK_125M (BIT(2) | BIT(1))
+#define YT8511_PLLON_SLP BIT(14)
+
+/* RX Delay enabled = 1.8ns 1000T, 8ns 10/100T */
+#define YT8511_DELAY_RX BIT(0)
+
+/* TX Gig-E Delay is bits 7:4, default 0x5
+ * TX Fast-E Delay is bits 15:12, default 0xf
+ * Delay = 150ps * N - 250ps
+ * On = 2000ps, off = 50ps
+ */
+#define YT8511_DELAY_GE_TX_EN (0xf << 4)
+#define YT8511_DELAY_GE_TX_DIS (0x2 << 4)
+#define YT8511_DELAY_FE_TX_EN (0xf << 12)
+#define YT8511_DELAY_FE_TX_DIS (0x2 << 12)
+
+static int yt8511_read_page(struct phy_device *phydev)
+{
+ return __phy_read(phydev, YT8511_PAGE_SELECT);
+};
+
+static int yt8511_write_page(struct phy_device *phydev, int page)
+{
+ return __phy_write(phydev, YT8511_PAGE_SELECT, page);
+};
+
+static int yt8511_config_init(struct phy_device *phydev)
+{
+ unsigned int ge, fe;
+ int ret, oldpage;
+
+ /* set clock mode to 125mhz */
+ oldpage = phy_select_page(phydev, YT8511_EXT_CLK_GATE);
+ if (oldpage < 0)
+ goto err_restore_page;
+
+ ret = __phy_modify(phydev, YT8511_PAGE, 0, YT8511_CLK_125M);
+ if (ret < 0)
+ goto err_restore_page;
+
+ /* set rgmii delay mode */
+ switch (phydev->interface) {
+ case PHY_INTERFACE_MODE_RGMII:
+ ge = YT8511_DELAY_GE_TX_DIS;
+ fe = YT8511_DELAY_FE_TX_DIS;
+ break;
+ case PHY_INTERFACE_MODE_RGMII_RXID:
+ ge = YT8511_DELAY_RX | YT8511_DELAY_GE_TX_DIS;
+ fe = YT8511_DELAY_FE_TX_DIS;
+ break;
+ case PHY_INTERFACE_MODE_RGMII_TXID:
+ ge = YT8511_DELAY_GE_TX_EN;
+ fe = YT8511_DELAY_FE_TX_EN;
+ break;
+ case PHY_INTERFACE_MODE_RGMII_ID:
+ ge = YT8511_DELAY_RX | YT8511_DELAY_GE_TX_EN;
+ fe = YT8511_DELAY_FE_TX_EN;
+ break;
+ default: /* leave everything alone in other modes */
+ break;
+ }
+
+ ret = __phy_modify(phydev, YT8511_PAGE, (YT8511_DELAY_RX | YT8511_DELAY_GE_TX_EN), ge);
+ if (ret < 0)
+ goto err_restore_page;
+
+ /* fast ethernet delay is in a separate page */
+ ret = __phy_write(phydev, YT8511_PAGE_SELECT, YT8511_EXT_DELAY_DRIVE);
+ if (ret < 0)
+ goto err_restore_page;
+
+ ret = __phy_modify(phydev, YT8511_PAGE, YT8511_DELAY_FE_TX_EN, fe);
+ if (ret < 0)
+ goto err_restore_page;
+
+ /* leave pll enabled in sleep */
+ ret = __phy_write(phydev, YT8511_PAGE_SELECT, YT8511_EXT_SLEEP_CTRL);
+ if (ret < 0)
+ goto err_restore_page;
+
+ ret = __phy_modify(phydev, YT8511_PAGE, 0, YT8511_PLLON_SLP);
+ if (ret < 0)
+ goto err_restore_page;
+
+err_restore_page:
+ return phy_restore_page(phydev, oldpage, ret);
+}
+
+static struct phy_driver motorcomm_phy_drvs[] = {
+ {
+ PHY_ID_MATCH_EXACT(PHY_ID_YT8511),
+ .name = "YT8511 Gigabit Ethernet",
+ .config_init = yt8511_config_init,
+ .suspend = genphy_suspend,
+ .resume = genphy_resume,
+ .read_page = yt8511_read_page,
+ .write_page = yt8511_write_page,
+ },
+};
+
+module_phy_driver(motorcomm_phy_drvs);
+
+MODULE_DESCRIPTION("Motorcomm PHY driver");
+MODULE_AUTHOR("Peter Geis");
+MODULE_LICENSE("GPL");
+
+static const struct mdio_device_id __maybe_unused motorcomm_tbl[] = {
+ { PHY_ID_MATCH_EXACT(PHY_ID_YT8511) },
+ { /* sentinal */ }
+};
+
+MODULE_DEVICE_TABLE(mdio, motorcomm_tbl);
--
2.25.1