diff options
Diffstat (limited to 'drivers/net/phy/motorcomm.c')
-rw-r--r-- | drivers/net/phy/motorcomm.c | 136 |
1 files changed, 136 insertions, 0 deletions
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@gmail.com> + */ + +#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); |