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Date: Fri, 14 Oct 2022 20:58:55 +0530 From: Arun Ramadoss <arun.ramadoss@...rochip.com> To: <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org> CC: <woojung.huh@...rochip.com>, <UNGLinuxDriver@...rochip.com>, <andrew@...n.ch>, <vivien.didelot@...il.com>, <f.fainelli@...il.com>, <olteanv@...il.com>, <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>, <linux@...linux.org.uk>, <Tristram.Ha@...rochip.com>, <richardcochran@...il.com> Subject: [RFC Patch net-next 4/6] net: dsa: microchip: enable the ptp interrupt for timestamping PTP Interrupt mask and status register differ from the global and port interrupt mechanism by two methods. One is that for global/port interrupt enabling we have to clear the bit but for ptp interrupt we have to set the bit. And other is bit12:0 is reserver in ptp interrupt registers. This forced to not use the generic implementation of global/port interrupt method routine. This patch implement the ptp interrupt mechanism to read the timestamp register for sync, pdelay_req and pdelay_resp. Signed-off-by: Arun Ramadoss <arun.ramadoss@...rochip.com> --- drivers/net/dsa/microchip/ksz_common.c | 15 +- drivers/net/dsa/microchip/ksz_common.h | 10 ++ drivers/net/dsa/microchip/ksz_ptp.c | 201 ++++++++++++++++++++++++ drivers/net/dsa/microchip/ksz_ptp.h | 9 ++ drivers/net/dsa/microchip/ksz_ptp_reg.h | 16 ++ 5 files changed, 249 insertions(+), 2 deletions(-) diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c index d8ec5b641b89..0c0fdb7b7879 100644 --- a/drivers/net/dsa/microchip/ksz_common.c +++ b/drivers/net/dsa/microchip/ksz_common.c @@ -1988,13 +1988,17 @@ static int ksz_setup(struct dsa_switch *ds) ret = ksz_pirq_setup(dev, dp->index); if (ret) goto out_girq; + + ret = ksz_ptp_irq_setup(ds, dp->index); + if (ret) + goto out_pirq; } } ret = ksz_ptp_clock_register(ds); if (ret) { dev_err(dev->dev, "Failed to register PTP clock: %d\n", ret); - goto out_pirq; + goto out_ptpirq; } ret = ksz_mdio_register(dev); @@ -2011,6 +2015,10 @@ static int ksz_setup(struct dsa_switch *ds) out_ptp_clock_unregister: ksz_ptp_clock_unregister(ds); +out_ptpirq: + if (dev->irq > 0) + dsa_switch_for_each_user_port(dp, dev->ds) + ksz_ptp_irq_free(ds, dp->index); out_pirq: if (dev->irq > 0) dsa_switch_for_each_user_port(dp, dev->ds) @@ -2030,8 +2038,11 @@ static void ksz_teardown(struct dsa_switch *ds) ksz_ptp_clock_unregister(ds); if (dev->irq > 0) { - dsa_switch_for_each_user_port(dp, dev->ds) + dsa_switch_for_each_user_port(dp, dev->ds) { + ksz_ptp_irq_free(ds, dp->index); + ksz_irq_free(&dev->ports[dp->index].pirq); + } ksz_irq_free(&dev->girq); } diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h index b15bcb6251e9..3a640ca4f7e1 100644 --- a/drivers/net/dsa/microchip/ksz_common.h +++ b/drivers/net/dsa/microchip/ksz_common.h @@ -85,6 +85,13 @@ struct ksz_irq { struct ksz_device *dev; }; +struct ksz_ptp_irq { + struct ksz_device *dev; + u16 ts_reg; + char name[16]; + int irq_num; +}; + struct ksz_port { bool remove_tag; /* Remove Tag flag set, for ksz8795 only */ bool learning; @@ -106,6 +113,8 @@ struct ksz_port { struct ksz_irq pirq; u8 num; #if IS_ENABLED(CONFIG_NET_DSA_MICROCHIP_KSZ_PTP) + struct ksz_irq ptpirq; + struct ksz_ptp_irq ptpmsg_irq[3]; bool hwts_tx_en; #endif }; @@ -605,6 +614,7 @@ static inline int is_lan937x(struct ksz_device *dev) #define REG_PORT_INT_MASK 0x001F #define PORT_SRC_PHY_INT 1 +#define PORT_SRC_PTP_INT 2 /* Regmap tables generation */ #define KSZ_SPI_OP_RD 3 diff --git a/drivers/net/dsa/microchip/ksz_ptp.c b/drivers/net/dsa/microchip/ksz_ptp.c index c4cef3884a4d..2cae543f7e0b 100644 --- a/drivers/net/dsa/microchip/ksz_ptp.c +++ b/drivers/net/dsa/microchip/ksz_ptp.c @@ -4,6 +4,8 @@ */ #include <linux/dsa/ksz_common.h> +#include <linux/irq.h> +#include <linux/irqdomain.h> #include <linux/kernel.h> #include <linux/ptp_classify.h> #include <linux/ptp_clock_kernel.h> @@ -22,6 +24,8 @@ #define KSZ_PTP_INC_NS 40 /* HW clock is incremented every 40 ns (by 40) */ #define KSZ_PTP_SUBNS_BITS 32 /* Number of bits in sub-nanoseconds counter */ +#define KSZ_PTP_INT_START 13 + static int ksz_ptp_enable_mode(struct ksz_device *dev, bool enable) { struct ksz_ptp_data *ptp_data = &dev->ptp_data; @@ -422,6 +426,203 @@ void ksz_ptp_clock_unregister(struct dsa_switch *ds) ptp_clock_unregister(ptp_data->clock); } +static irqreturn_t ksz_ptp_msg_thread_fn(int irq, void *dev_id) +{ + return IRQ_NONE; +} + +static irqreturn_t ksz_ptp_irq_thread_fn(int irq, void *dev_id) +{ + struct ksz_irq *ptpirq = dev_id; + unsigned int nhandled = 0; + struct ksz_device *dev; + unsigned int sub_irq; + u16 data; + int ret; + u8 n; + + dev = ptpirq->dev; + + /* Read interrupt status register */ + ret = ksz_read16(dev, ptpirq->reg_status, &data); + if (ret) + goto out; + + for (n = 0; n < ptpirq->nirqs; ++n) { + if (data & BIT(n + KSZ_PTP_INT_START)) { + sub_irq = irq_find_mapping(ptpirq->domain, n); + handle_nested_irq(sub_irq); + ++nhandled; + } + } + + //Clear the interrupts W1C + ret = ksz_write16(dev, ptpirq->reg_status, data); + if (ret) + return IRQ_NONE; + +out: + return (nhandled > 0 ? IRQ_HANDLED : IRQ_NONE); +} + +static void ksz_ptp_irq_mask(struct irq_data *d) +{ + struct ksz_irq *kirq = irq_data_get_irq_chip_data(d); + + kirq->masked &= ~BIT(d->hwirq + KSZ_PTP_INT_START); +} + +static void ksz_ptp_irq_unmask(struct irq_data *d) +{ + struct ksz_irq *kirq = irq_data_get_irq_chip_data(d); + + kirq->masked |= BIT(d->hwirq + KSZ_PTP_INT_START); +} + +static void ksz_ptp_irq_bus_lock(struct irq_data *d) +{ + struct ksz_irq *kirq = irq_data_get_irq_chip_data(d); + + mutex_lock(&kirq->dev->lock_irq); +} + +static void ksz_ptp_irq_bus_sync_unlock(struct irq_data *d) +{ + struct ksz_irq *kirq = irq_data_get_irq_chip_data(d); + struct ksz_device *dev = kirq->dev; + int ret; + + ret = ksz_write16(dev, kirq->reg_mask, kirq->masked); + if (ret) + dev_err(dev->dev, "failed to change IRQ mask\n"); + + mutex_unlock(&dev->lock_irq); +} + +static const struct irq_chip ksz_ptp_irq_chip = { + .name = "ksz-irq", + .irq_mask = ksz_ptp_irq_mask, + .irq_unmask = ksz_ptp_irq_unmask, + .irq_bus_lock = ksz_ptp_irq_bus_lock, + .irq_bus_sync_unlock = ksz_ptp_irq_bus_sync_unlock, +}; + +static int ksz_ptp_irq_domain_map(struct irq_domain *d, + unsigned int irq, irq_hw_number_t hwirq) +{ + irq_set_chip_data(irq, d->host_data); + irq_set_chip_and_handler(irq, &ksz_ptp_irq_chip, handle_level_irq); + irq_set_noprobe(irq); + + return 0; +} + +static const struct irq_domain_ops ksz_ptp_irq_domain_ops = { + .map = ksz_ptp_irq_domain_map, + .xlate = irq_domain_xlate_twocell, +}; + +static int ksz_ptp_msg_irq_setup(struct ksz_port *port) +{ + u16 ts_reg[] = {REG_PTP_PORT_PDRESP_TS, REG_PTP_PORT_XDELAY_TS, + REG_PTP_PORT_SYNC_TS}; + struct ksz_device *dev = port->ksz_dev; + struct ksz_irq *ptpirq = &port->ptpirq; + struct ksz_ptp_irq *ptpmsg_irq; + int ret; + u8 n; + + for (n = 0; n < ptpirq->nirqs; n++) { + ptpmsg_irq = &port->ptpmsg_irq[n]; + + ptpmsg_irq->dev = port->ksz_dev; + ptpmsg_irq->ts_reg = dev->dev_ops->get_port_addr(port->num, + ts_reg[n]); + ptpmsg_irq->irq_num = irq_create_mapping(ptpirq->domain, n); + if (ptpmsg_irq->irq_num < 0) { + ret = ptpmsg_irq->irq_num; + goto out; + } + + snprintf(ptpmsg_irq->name, sizeof(ptpmsg_irq->name), + "PTP-MSG-%d", n); + + ret = request_threaded_irq(ptpmsg_irq->irq_num, NULL, + ksz_ptp_msg_thread_fn, + IRQF_ONESHOT | IRQF_TRIGGER_FALLING, + ptpmsg_irq->name, ptpmsg_irq); + if (ret) + goto out; + } + + return 0; + +out: + while (n--) + irq_dispose_mapping(port->ptpmsg_irq[n].irq_num); + + return ret; +} + +int ksz_ptp_irq_setup(struct dsa_switch *ds, u8 p) +{ + struct ksz_device *dev = ds->priv; + const struct ksz_dev_ops *ops = dev->dev_ops; + struct ksz_port *port = &dev->ports[p]; + struct ksz_irq *ptpirq = &port->ptpirq; + int ret; + + ptpirq->dev = dev; + ptpirq->masked = 0; + ptpirq->nirqs = 3; + ptpirq->reg_mask = ops->get_port_addr(p, REG_PTP_PORT_TX_INT_ENABLE__2); + ptpirq->reg_status = ops->get_port_addr(p, + REG_PTP_PORT_TX_INT_STATUS__2); + snprintf(ptpirq->name, sizeof(ptpirq->name), "ptp_irq-%d", p); + + ptpirq->irq_num = irq_find_mapping(port->pirq.domain, PORT_SRC_PTP_INT); + if (ptpirq->irq_num < 0) + return ptpirq->irq_num; + + ptpirq->domain = irq_domain_add_simple(dev->dev->of_node, ptpirq->nirqs, + 0, &ksz_ptp_irq_domain_ops, + ptpirq); + if (!ptpirq->domain) + return -ENOMEM; + + ret = request_threaded_irq(ptpirq->irq_num, NULL, ksz_ptp_irq_thread_fn, + IRQF_ONESHOT | IRQF_TRIGGER_FALLING, + ptpirq->name, ptpirq); + if (ret) + goto out; + + ret = ksz_ptp_msg_irq_setup(port); + if (ret) + goto out; + + return 0; + +out: + irq_dispose_mapping(ptpirq->irq_num); + + return ret; +} + +void ksz_ptp_irq_free(struct dsa_switch *ds, u8 p) +{ + struct ksz_device *dev = ds->priv; + struct ksz_port *port = &dev->ports[p]; + struct ksz_irq *ptpirq = &port->ptpirq; + u8 n; + + free_irq(ptpirq->irq_num, ptpirq); + + for (n = 0; n < ptpirq->nirqs; n++) + irq_dispose_mapping(port->ptpmsg_irq[n].irq_num); + + irq_domain_remove(ptpirq->domain); +} + MODULE_AUTHOR("Arun Ramadoss <arun.ramadoss@...rochip.com>"); MODULE_DESCRIPTION("PTP support for KSZ switch"); MODULE_LICENSE("GPL"); diff --git a/drivers/net/dsa/microchip/ksz_ptp.h b/drivers/net/dsa/microchip/ksz_ptp.h index 09c0e58c365e..7e5d374d2acf 100644 --- a/drivers/net/dsa/microchip/ksz_ptp.h +++ b/drivers/net/dsa/microchip/ksz_ptp.h @@ -26,6 +26,8 @@ int ksz_get_ts_info(struct dsa_switch *ds, int port, struct ethtool_ts_info *ts); int ksz_hwtstamp_get(struct dsa_switch *ds, int port, struct ifreq *ifr); int ksz_hwtstamp_set(struct dsa_switch *ds, int port, struct ifreq *ifr); +int ksz_ptp_irq_setup(struct dsa_switch *ds, u8 p); +void ksz_ptp_irq_free(struct dsa_switch *ds, u8 p); #else @@ -55,6 +57,13 @@ static inline int ksz_hwtstamp_set(struct dsa_switch *ds, int port, return -EOPNOTSUPP; } +static inline int ksz_ptp_irq_setup(struct dsa_switch *ds, u8 p) +{ + return 0; +} + +static inline void ksz_ptp_irq_free(struct dsa_switch *ds, u8 p) {} + #endif /* End of CONFIG_NET_DSA_MICROCHIOP_KSZ_PTP */ #endif diff --git a/drivers/net/dsa/microchip/ksz_ptp_reg.h b/drivers/net/dsa/microchip/ksz_ptp_reg.h index 2bf8395475b9..2ae6c8b01b00 100644 --- a/drivers/net/dsa/microchip/ksz_ptp_reg.h +++ b/drivers/net/dsa/microchip/ksz_ptp_reg.h @@ -50,3 +50,19 @@ #define PTP_TC_P2P BIT(2) #define PTP_MASTER BIT(1) #define PTP_1STEP BIT(0) + +/* Port PTP Register */ +#define REG_PTP_PORT_RX_DELAY__2 0x0C00 +#define REG_PTP_PORT_TX_DELAY__2 0x0C02 +#define REG_PTP_PORT_ASYM_DELAY__2 0x0C04 + +#define REG_PTP_PORT_XDELAY_TS 0x0C08 +#define REG_PTP_PORT_SYNC_TS 0x0C0C +#define REG_PTP_PORT_PDRESP_TS 0x0C10 + +#define REG_PTP_PORT_TX_INT_STATUS__2 0x0C14 +#define REG_PTP_PORT_TX_INT_ENABLE__2 0x0C16 + +#define PTP_PORT_SYNC_INT BIT(15) +#define PTP_PORT_XDELAY_REQ_INT BIT(14) +#define PTP_PORT_PDELAY_RESP_INT BIT(13) -- 2.36.1
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