From d08cb25556773c65efb21761b75f92c804ad0975 Mon Sep 17 00:00:00 2001 From: David Yang Date: Fri, 28 Oct 2022 10:01:01 +0800 Subject: [PATCH] net: mv643xx_eth: support MII/GMII/RGMII modes for Kirkwood Support mode switch properly, which is not available before. If SoC has two Ethernet controllers, by setting both of them into MII mode, the first controller enters GMII mode, while the second controller is effectively disabled. This requires configuring (and maybe enabling) the second controller in the device tree, even though it cannot be used. Signed-off-by: David Yang Signed-off-by: David S. Miller --- drivers/net/ethernet/marvell/mv643xx_eth.c | 49 ++++++++++++++++++---- include/linux/mv643xx_eth.h | 2 + 2 files changed, 44 insertions(+), 7 deletions(-) diff --git a/drivers/net/ethernet/marvell/mv643xx_eth.c b/drivers/net/ethernet/marvell/mv643xx_eth.c index 707993b445d1..4389a33a2ea6 100644 --- a/drivers/net/ethernet/marvell/mv643xx_eth.c +++ b/drivers/net/ethernet/marvell/mv643xx_eth.c @@ -108,6 +108,7 @@ static char mv643xx_eth_driver_version[] = "1.4"; #define TXQ_COMMAND 0x0048 #define TXQ_FIX_PRIO_CONF 0x004c #define PORT_SERIAL_CONTROL1 0x004c +#define RGMII_EN 0x00000008 #define CLK125_BYPASS_EN 0x00000010 #define TX_BW_RATE 0x0050 #define TX_BW_MTU 0x0058 @@ -2761,6 +2762,8 @@ static int mv643xx_eth_shared_of_add_port(struct platform_device *pdev, mv643xx_eth_property(pnp, "rx-sram-addr", ppd.rx_sram_addr); mv643xx_eth_property(pnp, "rx-sram-size", ppd.rx_sram_size); + of_get_phy_mode(pnp, &ppd.interface); + ppd.phy_node = of_parse_phandle(pnp, "phy-handle", 0); if (!ppd.phy_node) { ppd.phy_addr = MV643XX_ETH_PHY_NONE; @@ -3092,6 +3095,7 @@ static int mv643xx_eth_probe(struct platform_device *pdev) struct mv643xx_eth_private *mp; struct net_device *dev; struct phy_device *phydev = NULL; + u32 psc1r; int err, irq; pd = dev_get_platdata(&pdev->dev); @@ -3119,14 +3123,45 @@ static int mv643xx_eth_probe(struct platform_device *pdev) mp->dev = dev; - /* Kirkwood resets some registers on gated clocks. Especially - * CLK125_BYPASS_EN must be cleared but is not available on - * all other SoCs/System Controllers using this driver. - */ if (of_device_is_compatible(pdev->dev.of_node, - "marvell,kirkwood-eth-port")) - wrlp(mp, PORT_SERIAL_CONTROL1, - rdlp(mp, PORT_SERIAL_CONTROL1) & ~CLK125_BYPASS_EN); + "marvell,kirkwood-eth-port")) { + psc1r = rdlp(mp, PORT_SERIAL_CONTROL1); + + /* Kirkwood resets some registers on gated clocks. Especially + * CLK125_BYPASS_EN must be cleared but is not available on + * all other SoCs/System Controllers using this driver. + */ + psc1r &= ~CLK125_BYPASS_EN; + + /* On Kirkwood with two Ethernet controllers, if both of them + * have RGMII_EN disabled, the first controller will be in GMII + * mode and the second one is effectively disabled, instead of + * two MII interfaces. + * + * To enable GMII in the first controller, the second one must + * also be configured (and may be enabled) with RGMII_EN + * disabled too, even though it cannot be used at all. + */ + switch (pd->interface) { + /* Use internal to denote second controller being disabled */ + case PHY_INTERFACE_MODE_INTERNAL: + case PHY_INTERFACE_MODE_MII: + case PHY_INTERFACE_MODE_GMII: + psc1r &= ~RGMII_EN; + break; + case PHY_INTERFACE_MODE_RGMII: + case PHY_INTERFACE_MODE_RGMII_ID: + case PHY_INTERFACE_MODE_RGMII_RXID: + case PHY_INTERFACE_MODE_RGMII_TXID: + psc1r |= RGMII_EN; + break; + default: + /* Unknown; don't touch */ + break; + } + + wrlp(mp, PORT_SERIAL_CONTROL1, psc1r); + } /* * Start with a default rate, and if there is a clock, allow diff --git a/include/linux/mv643xx_eth.h b/include/linux/mv643xx_eth.h index 3682ae75c7aa..145169be2ed8 100644 --- a/include/linux/mv643xx_eth.h +++ b/include/linux/mv643xx_eth.h @@ -8,6 +8,7 @@ #include #include +#include #define MV643XX_ETH_SHARED_NAME "mv643xx_eth" #define MV643XX_ETH_NAME "mv643xx_eth_port" @@ -59,6 +60,7 @@ struct mv643xx_eth_platform_data { */ int speed; int duplex; + phy_interface_t interface; /* * How many RX/TX queues to use. -- 2.39.5