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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Subject: [PATCH net-next] net: phy: add basic driver for NXP CBTX PHY Date: Tue, 11 Apr 2023 18:57:06 +0300 Message-Id: <20230411155706.1713311-1-vladimir.oltean@nxp.com> X-Mailer: git-send-email 2.34.1 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: FR3P281CA0023.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:1c::7) To AM0PR04MB6452.eurprd04.prod.outlook.com (2603:10a6:208:16d::21) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM0PR04MB6452:EE_|AS8PR04MB9189:EE_ X-MS-Office365-Filtering-Correlation-Id: 06b84e2e-c133-4d58-0ec1-08db3aa56c32 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:AM0PR04MB6452.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230028)(4636009)(366004)(396003)(346002)(136003)(376002)(39860400002)(451199021)(478600001)(52116002)(6512007)(1076003)(26005)(316002)(6506007)(44832011)(186003)(54906003)(2906002)(5660300002)(4326008)(66946007)(41300700001)(8676002)(6666004)(6916009)(66476007)(6486002)(8936002)(66556008)(38350700002)(86362001)(83380400001)(36756003)(2616005)(38100700002);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?3hi7ZQWO6EuB68+EziZaUNzbf1brn5kwdPkIE3nF6SONtKI7UWF2Iz7yqjn5?= =?us-ascii?Q?+oz3SPnIgdfYeunj7w4qxOCttrks9EUAVv4PQ5/AysIwcmPHste0rZ3A4DDR?= =?us-ascii?Q?l+YczzsFRFA/8S6Ts5A1tjK5ZZ+2A72cXyutq7sJsbkDojDk3KuceEThlFag?= =?us-ascii?Q?0oEm/mz0huEOZ/YERiWaRfIcroGCb2Nzsyhj0K9sa3iQXmh528st2P7/DBNr?= =?us-ascii?Q?bzc/i9OeTvZeCvmlhDxTvgKo0WvFl7T9c7WaNGebfJ3NdIKHrl/d8SUgUkss?= =?us-ascii?Q?5RNJmeOFnNFKX8Yoc6Wxf1tPYvsTGDAIu36DYxySQB3bwmPHOJo0E/OXchoj?= =?us-ascii?Q?311gEJB7Lkmd7HdH5weGQW88xvl/JZ7JqcvwbScQLAWf0n9B0KUmvMoh4ZvC?= =?us-ascii?Q?tBnJWIpOBVRNrWx2XiKRZerleb4L3nRwtdgSyzlC1IuAgaANbZu/OlfT4tHw?= =?us-ascii?Q?YoeRXykqLnM04jMYzbK76gY1MDCRa2KSQ2oGiuPyDCBtj9XcGLe1qxPrsPAI?= =?us-ascii?Q?CpPgLwwxGBCSgJDJ46AJCph0tslZ2Ii4Q5QEu1uBD3aaPkwAh0FzCObHOdgd?= =?us-ascii?Q?gVBz8wgrHm7ft9XA/xs9Ohz5IkroIG9f3ex0LSSKIKJfkI5HituO1ULlp7VF?= =?us-ascii?Q?nacxx2zjs/uRL3sUdf9hE3XG7MDbT5KBUvGtYkHD7V+klyQo23/jQ6pbcyeS?= =?us-ascii?Q?N7hYp9pkaW3lpEF8FNDr76Pt9lYFpu+uEJmeKCJn7FJiephTlC9I6Q+AwhOo?= =?us-ascii?Q?gQzKzP+ZOMEWrjbC8buD1dZr6pKRNg+xLuyGRHAk/sLTn1R+MVsxgcrdr8yn?= =?us-ascii?Q?lq1ncuCVXGKytAN8SAogZ76ixE43fAmNKy3aw+wxAFd+R+j3zIygG4hpspIl?= =?us-ascii?Q?DZnUTJfqzPfZyAjwn/MJ4srzS4HzrQ2belCrmhAXOBFauhBVd5ovlhmaJq55?= =?us-ascii?Q?VpKVJDcUZJaxRLhF/uAsnTqWPMSk/nmS1OQTpQx6YpjwM53eSw7xrfwAQmtD?= =?us-ascii?Q?ntY0r7ZWuZ+zb80LVqtDLbpdyG/UAjo14NIF47FvQYqmMD62G0KBn3G2Buwx?= =?us-ascii?Q?esNUuJ/HUTKM4rJl4BnQE55iGs3ezpb2ya0mQfouqZlPPZ6vJXex1nHAVAuT?= =?us-ascii?Q?puHpQUyUejofHtsknFMKzu9IoYgSR3qi2WzPkhnBdGfWh9dPMw69ipbgwd9P?= =?us-ascii?Q?lkfEh7laPchuZeAq7cjzamF00ttct3OIBcjhFhyB0DnLZIZVmx7NmM/x0luY?= =?us-ascii?Q?fO9aiJjVA+cpUqWgCP+j7vxCu1npBQq745ozE6/4LoJTQh7VnmUjcesyFVns?= =?us-ascii?Q?Gue0Erawpd4RFzkvQNei8i/TZkM8ts/39YBAUcEVBgQB2KUuieAK5YRYMwIP?= =?us-ascii?Q?tE/4hEG/GybYtNV2djg1x8/ccaIWUfDVgygJEq2MZNQ+PFNkOA0/NXfUkolg?= =?us-ascii?Q?WS4EioY0EazbU8+FCLX8cKQviyb6QuUoNrMvPlodedsiubQJ0ZofIqwcs32v?= =?us-ascii?Q?NFoWkttJ3x/+ZSGNZDwYhNEUrgWCgvMhMoZgQ2OEsAmNSNXFh19qJtbWMelH?= =?us-ascii?Q?eou18d4kTfjyHAQqeAd+s/WqK8rkad6OHDhrCdlu9fnOy3gSFScfU3U5VUwi?= =?us-ascii?Q?Iw=3D=3D?= X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 06b84e2e-c133-4d58-0ec1-08db3aa56c32 X-MS-Exchange-CrossTenant-AuthSource: AM0PR04MB6452.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Apr 2023 15:57:16.4743 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: X4WVq6kn7UA7Xmn0OWXrBL4YRMQNQ3Cb0m6gAHsCHxl8EKjCTzHXL2k1GKImXSI6ViHMJRhR4qgFnIkmeoLnKg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR04MB9189 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org The CBTX PHY is a Fast Ethernet PHY integrated into the SJA1110 A/B/C automotive Ethernet switches. It was hoped it would work with the Generic PHY driver, but alas, it doesn't. The most important reason why is that the PHY is powered down by default, and it needs a vendor register to power it on. It has a linear memory map that is accessed over SPI by the SJA1110 switch driver, which exposes a fake MDIO controller. It has the following (and only the following) standard clause 22 registers: 0x0: MII_BMCR 0x1: MII_BMSR 0x2: MII_PHYSID1 0x3: MII_PHYSID2 0x4: MII_ADVERTISE 0x5: MII_LPA 0x6: MII_EXPANSION 0x7: the missing MII_NPAGE for Next Page Transmit Register Every other register is vendor-defined. The register map expands the standard clause 22 5-bit address space of 0x20 registers, however the driver does not need to access the extra registers for now (and hopefully never). If it ever needs to do that, it is possible to implement a fake (software) page switching mechanism between the PHY driver and the SJA1110 MDIO controller driver. Also, Auto-MDIX is turned off by default in hardware, the driver turns it on by default and reports the current status. I've tested this with a VSC8514 link partner and a crossover cable, by forcing the mode on the link partner, and seeing that the CBTX PHY always sees the reverse of the mode forced on the VSC8514 (and that traffic works). The link doesn't come up (as expected) if MDI modes are forced on both ends in the same way (with the cross-over cable, that is). Signed-off-by: Vladimir Oltean --- drivers/net/phy/Kconfig | 6 + drivers/net/phy/Makefile | 1 + drivers/net/phy/nxp-cbtx.c | 251 +++++++++++++++++++++++++++++++++++++ 3 files changed, 258 insertions(+) create mode 100644 drivers/net/phy/nxp-cbtx.c diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig index 6b9525def973..eae6fc697ba3 100644 --- a/drivers/net/phy/Kconfig +++ b/drivers/net/phy/Kconfig @@ -265,6 +265,12 @@ config NATIONAL_PHY help Currently supports the DP83865 PHY. +config NXP_CBTX_PHY + tristate "NXP 100BASE-TX PHYs" + help + Support the 100BASE-TX PHY integrated on the SJA1110 automotive + switch family. + config NXP_C45_TJA11XX_PHY tristate "NXP C45 TJA11XX PHYs" depends on PTP_1588_CLOCK_OPTIONAL diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile index b5138066ba04..ae11bf20b46e 100644 --- a/drivers/net/phy/Makefile +++ b/drivers/net/phy/Makefile @@ -79,6 +79,7 @@ obj-$(CONFIG_MOTORCOMM_PHY) += motorcomm.o obj-$(CONFIG_NATIONAL_PHY) += national.o obj-$(CONFIG_NCN26000_PHY) += ncn26000.o obj-$(CONFIG_NXP_C45_TJA11XX_PHY) += nxp-c45-tja11xx.o +obj-$(CONFIG_NXP_CBTX_PHY) += nxp-cbtx.o obj-$(CONFIG_NXP_TJA11XX_PHY) += nxp-tja11xx.o obj-$(CONFIG_QSEMI_PHY) += qsemi.o obj-$(CONFIG_REALTEK_PHY) += realtek.o diff --git a/drivers/net/phy/nxp-cbtx.c b/drivers/net/phy/nxp-cbtx.c new file mode 100644 index 000000000000..936761ec516e --- /dev/null +++ b/drivers/net/phy/nxp-cbtx.c @@ -0,0 +1,251 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Driver for 100BASE-TX PHY embedded into NXP SJA1110 switch + * + * Copyright 2022-2023 NXP + */ + +#include +#include +#include +#include + +#define PHY_ID_CBTX_SJA1110 0x001bb020 + +/* Registers */ +#define CBTX_MODE_CTRL_STAT 0x11 +#define CBTX_PDOWN_CTRL 0x18 +#define CBTX_RX_ERR_COUNTER 0x1a +#define CBTX_IRQ_STAT 0x1d +#define CBTX_IRQ_ENABLE 0x1e + +/* Fields */ +#define CBTX_MODE_CTRL_STAT_AUTO_MDIX_EN BIT(7) +#define CBTX_MODE_CTRL_STAT_MDIX_MODE BIT(6) + +#define CBTX_PDOWN_CTL_TRUE_PDOWN BIT(0) + +#define CBTX_IRQ_ENERGYON BIT(7) +#define CBTX_IRQ_AN_COMPLETE BIT(6) +#define CBTX_IRQ_REM_FAULT BIT(5) +#define CBTX_IRQ_LINK_DOWN BIT(4) +#define CBTX_IRQ_AN_LP_ACK BIT(3) +#define CBTX_IRQ_PARALLEL_DETECT_FAULT BIT(2) +#define CBTX_IRQ_AN_PAGE_RECV BIT(1) + +static int cbtx_soft_reset(struct phy_device *phydev) +{ + int ret; + + /* Can't soft reset unless we remove PHY from true power down mode */ + ret = phy_clear_bits(phydev, CBTX_PDOWN_CTRL, + CBTX_PDOWN_CTL_TRUE_PDOWN); + if (ret) + return ret; + + return genphy_soft_reset(phydev); +} + +static int cbtx_config_init(struct phy_device *phydev) +{ + /* Wait for cbtx_config_aneg() to kick in and apply this */ + phydev->mdix_ctrl = ETH_TP_MDI_AUTO; + + return 0; +} + +static int cbtx_suspend(struct phy_device *phydev) +{ + int ret; + + ret = genphy_suspend(phydev); + if (ret) + return ret; + + return phy_set_bits(phydev, CBTX_PDOWN_CTRL, + CBTX_PDOWN_CTL_TRUE_PDOWN); +} + +static int cbtx_resume(struct phy_device *phydev) +{ + int ret; + + ret = phy_clear_bits(phydev, CBTX_PDOWN_CTRL, + CBTX_PDOWN_CTL_TRUE_PDOWN); + if (ret) + return ret; + + return genphy_resume(phydev); +} + +static int cbtx_mdix_status(struct phy_device *phydev) +{ + int ret; + + ret = phy_read(phydev, CBTX_MODE_CTRL_STAT); + if (ret < 0) + return ret; + + if (ret & CBTX_MODE_CTRL_STAT_MDIX_MODE) + phydev->mdix = ETH_TP_MDI_X; + else + phydev->mdix = ETH_TP_MDI; + + return 0; +} + +static int cbtx_read_status(struct phy_device *phydev) +{ + int ret; + + ret = cbtx_mdix_status(phydev); + if (ret) + return ret; + + return genphy_read_status(phydev); +} + +static int cbtx_mdix_config(struct phy_device *phydev) +{ + int ret; + + switch (phydev->mdix_ctrl) { + case ETH_TP_MDI_AUTO: + return phy_set_bits(phydev, CBTX_MODE_CTRL_STAT, + CBTX_MODE_CTRL_STAT_AUTO_MDIX_EN); + case ETH_TP_MDI: + ret = phy_clear_bits(phydev, CBTX_MODE_CTRL_STAT, + CBTX_MODE_CTRL_STAT_AUTO_MDIX_EN); + if (ret) + return ret; + + return phy_clear_bits(phydev, CBTX_MODE_CTRL_STAT, + CBTX_MODE_CTRL_STAT_MDIX_MODE); + case ETH_TP_MDI_X: + ret = phy_clear_bits(phydev, CBTX_MODE_CTRL_STAT, + CBTX_MODE_CTRL_STAT_AUTO_MDIX_EN); + if (ret) + return ret; + + return phy_set_bits(phydev, CBTX_MODE_CTRL_STAT, + CBTX_MODE_CTRL_STAT_MDIX_MODE); + } + + return 0; +} + +static int cbtx_config_aneg(struct phy_device *phydev) +{ + int ret; + + ret = cbtx_mdix_config(phydev); + if (ret) + return ret; + + return genphy_config_aneg(phydev); +} + +static int cbtx_ack_interrupts(struct phy_device *phydev) +{ + return phy_read(phydev, CBTX_IRQ_STAT); +} + +static int cbtx_config_intr(struct phy_device *phydev) +{ + int ret; + + if (phydev->interrupts == PHY_INTERRUPT_ENABLED) { + ret = cbtx_ack_interrupts(phydev); + if (ret < 0) + return ret; + + ret = phy_write(phydev, CBTX_IRQ_ENABLE, + CBTX_IRQ_AN_COMPLETE | CBTX_IRQ_LINK_DOWN); + if (ret) + return ret; + } else { + ret = phy_write(phydev, CBTX_IRQ_ENABLE, 0); + if (ret) + return ret; + + ret = cbtx_ack_interrupts(phydev); + if (ret < 0) + return ret; + } + + return 0; +} + +static irqreturn_t cbtx_handle_interrupt(struct phy_device *phydev) +{ + int irq_stat, irq_enabled; + + irq_stat = cbtx_ack_interrupts(phydev); + if (irq_stat < 0) { + phy_error(phydev); + return IRQ_NONE; + } + + irq_enabled = phy_read(phydev, CBTX_IRQ_ENABLE); + if (irq_enabled < 0) { + phy_error(phydev); + return IRQ_NONE; + } + + if (!(irq_enabled & irq_stat)) + return IRQ_NONE; + + phy_trigger_machine(phydev); + + return IRQ_HANDLED; +} + +static int cbtx_get_sset_count(struct phy_device *phydev) +{ + return 1; +} + +static void cbtx_get_strings(struct phy_device *phydev, u8 *data) +{ + strncpy(data, "100btx_rx_err", ETH_GSTRING_LEN); +} + +static void cbtx_get_stats(struct phy_device *phydev, + struct ethtool_stats *stats, u64 *data) +{ + int ret; + + ret = phy_read(phydev, CBTX_RX_ERR_COUNTER); + data[0] = (ret < 0) ? U64_MAX : ret; +} + +static struct phy_driver cbtx_driver[] = { + { + PHY_ID_MATCH_MODEL(PHY_ID_CBTX_SJA1110), + .name = "NXP CBTX (SJA1110)", + /* PHY_BASIC_FEATURES */ + .soft_reset = cbtx_soft_reset, + .config_init = cbtx_config_init, + .suspend = cbtx_suspend, + .resume = cbtx_resume, + .config_intr = cbtx_config_intr, + .handle_interrupt = cbtx_handle_interrupt, + .read_status = cbtx_read_status, + .config_aneg = cbtx_config_aneg, + .get_sset_count = cbtx_get_sset_count, + .get_strings = cbtx_get_strings, + .get_stats = cbtx_get_stats, + }, +}; + +module_phy_driver(cbtx_driver); + +static struct mdio_device_id __maybe_unused cbtx_tbl[] = { + { PHY_ID_MATCH_MODEL(PHY_ID_CBTX_SJA1110) }, + { }, +}; + +MODULE_DEVICE_TABLE(mdio, cbtx_tbl); + +MODULE_AUTHOR("Vladimir Oltean "); +MODULE_DESCRIPTION("NXP CBTX PHY driver"); +MODULE_LICENSE("GPL"); -- 2.34.1