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Message-Id: <20210813220011.921211-2-linus.walleij@linaro.org>
Date: Sat, 14 Aug 2021 00:00:06 +0200
From: Linus Walleij <linus.walleij@...aro.org>
To: netdev@...r.kernel.org, "David S . Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>
Cc: Imre Kaloz <kaloz@...nwrt.org>, Krzysztof Halasa <khalasa@...p.pl>,
Arnd Bergmann <arnd@...db.de>,
Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH net-next 1/6 v2] ixp4xx_eth: make ptp support a platform driver
From: Arnd Bergmann <arnd@...db.de>
After the recent ixp4xx cleanups, the ptp driver has gained a
build failure in some configurations:
drivers/net/ethernet/xscale/ptp_ixp46x.c: In function 'ptp_ixp_init':
drivers/net/ethernet/xscale/ptp_ixp46x.c:290:51: error: 'IXP4XX_TIMESYNC_BASE_VIRT' undeclared (first use in this function)
Avoid the last bit of hardcoded constants from platform headers
by turning the ptp driver bit into a platform driver and passing
the IRQ and MMIO address as resources.
This is a bit tricky:
- The interface between the two drivers is now the new
ixp46x_ptp_find() function, replacing the global
ixp46x_phc_index variable. The call is done as late
as possible, in hwtstamp_set(), to ensure that the
ptp device is fully probed.
- As the ptp driver is now called by the network driver, the
link dependency is reversed, which in turn requires a small
Makefile hack
- The GPIO number is still left hardcoded. This is clearly not
great, but it can be addressed later. Note that commit 98ac0cc270b7
("ARM: ixp4xx: Convert to MULTI_IRQ_HANDLER") changed the
IRQ number to something meaningless. Passing the correct IRQ
in a resource fixes this.
- When the PTP driver is disabled, ethtool .get_ts_info()
now correctly lists only software timestamping regardless
of the hardware.
Signed-off-by: Arnd Bergmann <arnd@...db.de>
[Fix a missing include]
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
arch/arm/mach-ixp4xx/common.c | 14 ++++++
drivers/net/ethernet/xscale/Kconfig | 4 +-
drivers/net/ethernet/xscale/Makefile | 6 ++-
drivers/net/ethernet/xscale/ixp46x_ts.h | 13 ++++-
drivers/net/ethernet/xscale/ixp4xx_eth.c | 28 +++++++----
drivers/net/ethernet/xscale/ptp_ixp46x.c | 61 ++++++++++++++++--------
6 files changed, 92 insertions(+), 34 deletions(-)
diff --git a/arch/arm/mach-ixp4xx/common.c b/arch/arm/mach-ixp4xx/common.c
index b5eadd70d903..cdc720f54daa 100644
--- a/arch/arm/mach-ixp4xx/common.c
+++ b/arch/arm/mach-ixp4xx/common.c
@@ -268,9 +268,23 @@ static struct platform_device ixp46x_i2c_controller = {
.resource = ixp46x_i2c_resources
};
+static struct resource ixp46x_ptp_resources[] = {
+ DEFINE_RES_MEM(IXP4XX_TIMESYNC_BASE_PHYS, SZ_4K),
+ DEFINE_RES_IRQ_NAMED(IRQ_IXP4XX_GPIO8, "master"),
+ DEFINE_RES_IRQ_NAMED(IRQ_IXP4XX_GPIO7, "slave"),
+};
+
+static struct platform_device ixp46x_ptp = {
+ .name = "ptp-ixp46x",
+ .id = -1,
+ .resource = ixp46x_ptp_resources,
+ .num_resources = ARRAY_SIZE(ixp46x_ptp_resources),
+};
+
static struct platform_device *ixp46x_devices[] __initdata = {
&ixp46x_hwrandom_device,
&ixp46x_i2c_controller,
+ &ixp46x_ptp,
};
unsigned long ixp4xx_exp_bus_size;
diff --git a/drivers/net/ethernet/xscale/Kconfig b/drivers/net/ethernet/xscale/Kconfig
index 468ffe3d1707..0e878fa6e322 100644
--- a/drivers/net/ethernet/xscale/Kconfig
+++ b/drivers/net/ethernet/xscale/Kconfig
@@ -29,9 +29,9 @@ config IXP4XX_ETH
on IXP4xx processor.
config PTP_1588_CLOCK_IXP46X
- tristate "Intel IXP46x as PTP clock"
+ bool "Intel IXP46x as PTP clock"
depends on IXP4XX_ETH
- depends on PTP_1588_CLOCK
+ depends on PTP_1588_CLOCK=y || PTP_1588_CLOCK=IXP4XX_ETH
default y
help
This driver adds support for using the IXP46X as a PTP
diff --git a/drivers/net/ethernet/xscale/Makefile b/drivers/net/ethernet/xscale/Makefile
index 607f91b1e878..e935f2a2979f 100644
--- a/drivers/net/ethernet/xscale/Makefile
+++ b/drivers/net/ethernet/xscale/Makefile
@@ -3,5 +3,9 @@
# Makefile for the Intel XScale IXP device drivers.
#
+# Keep this link order to avoid deferred probing
+ifdef CONFIG_PTP_1588_CLOCK_IXP46X
+obj-$(CONFIG_IXP4XX_ETH) += ptp_ixp46x.o
+endif
+
obj-$(CONFIG_IXP4XX_ETH) += ixp4xx_eth.o
-obj-$(CONFIG_PTP_1588_CLOCK_IXP46X) += ptp_ixp46x.o
diff --git a/drivers/net/ethernet/xscale/ixp46x_ts.h b/drivers/net/ethernet/xscale/ixp46x_ts.h
index d792130e27b0..ee9b93ded20a 100644
--- a/drivers/net/ethernet/xscale/ixp46x_ts.h
+++ b/drivers/net/ethernet/xscale/ixp46x_ts.h
@@ -62,7 +62,16 @@ struct ixp46x_ts_regs {
#define TX_SNAPSHOT_LOCKED (1<<0)
#define RX_SNAPSHOT_LOCKED (1<<1)
-/* The ptp_ixp46x module will set this variable */
-extern int ixp46x_phc_index;
+#if IS_ENABLED(CONFIG_PTP_1588_CLOCK_IXP46X)
+int ixp46x_ptp_find(struct ixp46x_ts_regs *__iomem *regs, int *phc_index);
+#else
+static inline int ixp46x_ptp_find(struct ixp46x_ts_regs *__iomem *regs, int *phc_index)
+{
+ *regs = NULL;
+ *phc_index = -1;
+
+ return -ENODEV;
+}
+#endif
#endif
diff --git a/drivers/net/ethernet/xscale/ixp4xx_eth.c b/drivers/net/ethernet/xscale/ixp4xx_eth.c
index ff50305d6e13..0bd22beb83ed 100644
--- a/drivers/net/ethernet/xscale/ixp4xx_eth.c
+++ b/drivers/net/ethernet/xscale/ixp4xx_eth.c
@@ -169,6 +169,8 @@ struct eth_regs {
struct port {
struct eth_regs __iomem *regs;
+ struct ixp46x_ts_regs __iomem *timesync_regs;
+ int phc_index;
struct npe *npe;
struct net_device *netdev;
struct napi_struct napi;
@@ -295,7 +297,7 @@ static void ixp_rx_timestamp(struct port *port, struct sk_buff *skb)
ch = PORT2CHANNEL(port);
- regs = (struct ixp46x_ts_regs __iomem *) IXP4XX_TIMESYNC_BASE_VIRT;
+ regs = port->timesync_regs;
val = __raw_readl(®s->channel[ch].ch_event);
@@ -340,7 +342,7 @@ static void ixp_tx_timestamp(struct port *port, struct sk_buff *skb)
ch = PORT2CHANNEL(port);
- regs = (struct ixp46x_ts_regs __iomem *) IXP4XX_TIMESYNC_BASE_VIRT;
+ regs = port->timesync_regs;
/*
* This really stinks, but we have to poll for the Tx time stamp.
@@ -375,6 +377,7 @@ static int hwtstamp_set(struct net_device *netdev, struct ifreq *ifr)
struct hwtstamp_config cfg;
struct ixp46x_ts_regs *regs;
struct port *port = netdev_priv(netdev);
+ int ret;
int ch;
if (copy_from_user(&cfg, ifr->ifr_data, sizeof(cfg)))
@@ -383,8 +386,12 @@ static int hwtstamp_set(struct net_device *netdev, struct ifreq *ifr)
if (cfg.flags) /* reserved for future extensions */
return -EINVAL;
+ ret = ixp46x_ptp_find(&port->timesync_regs, &port->phc_index);
+ if (ret)
+ return ret;
+
ch = PORT2CHANNEL(port);
- regs = (struct ixp46x_ts_regs __iomem *) IXP4XX_TIMESYNC_BASE_VIRT;
+ regs = port->timesync_regs;
if (cfg.tx_type != HWTSTAMP_TX_OFF && cfg.tx_type != HWTSTAMP_TX_ON)
return -ERANGE;
@@ -988,25 +995,27 @@ static void ixp4xx_get_drvinfo(struct net_device *dev,
strlcpy(info->bus_info, "internal", sizeof(info->bus_info));
}
-int ixp46x_phc_index = -1;
-EXPORT_SYMBOL_GPL(ixp46x_phc_index);
-
static int ixp4xx_get_ts_info(struct net_device *dev,
struct ethtool_ts_info *info)
{
- if (!cpu_is_ixp46x()) {
+ struct port *port = netdev_priv(dev);
+
+ if (port->phc_index < 0)
+ ixp46x_ptp_find(&port->timesync_regs, &port->phc_index);
+
+ info->phc_index = port->phc_index;
+
+ if (info->phc_index < 0) {
info->so_timestamping =
SOF_TIMESTAMPING_TX_SOFTWARE |
SOF_TIMESTAMPING_RX_SOFTWARE |
SOF_TIMESTAMPING_SOFTWARE;
- info->phc_index = -1;
return 0;
}
info->so_timestamping =
SOF_TIMESTAMPING_TX_HARDWARE |
SOF_TIMESTAMPING_RX_HARDWARE |
SOF_TIMESTAMPING_RAW_HARDWARE;
- info->phc_index = ixp46x_phc_index;
info->tx_types =
(1 << HWTSTAMP_TX_OFF) |
(1 << HWTSTAMP_TX_ON);
@@ -1481,6 +1490,7 @@ static int ixp4xx_eth_probe(struct platform_device *pdev)
port = netdev_priv(ndev);
port->netdev = ndev;
port->id = plat->npe;
+ port->phc_index = -1;
/* Get the port resource and remap */
port->regs = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
diff --git a/drivers/net/ethernet/xscale/ptp_ixp46x.c b/drivers/net/ethernet/xscale/ptp_ixp46x.c
index a6fb88fd42f7..466f233edd21 100644
--- a/drivers/net/ethernet/xscale/ptp_ixp46x.c
+++ b/drivers/net/ethernet/xscale/ptp_ixp46x.c
@@ -5,6 +5,7 @@
* Copyright (C) 2010 OMICRON electronics GmbH
*/
#include <linux/device.h>
+#include <linux/module.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/init.h>
@@ -13,6 +14,7 @@
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/ptp_clock_kernel.h>
+#include <linux/platform_device.h>
#include <linux/soc/ixp4xx/cpu.h>
#include <linux/module.h>
#include <mach/ixp4xx-regs.h>
@@ -22,9 +24,7 @@
#define DRIVER "ptp_ixp46x"
#define N_EXT_TS 2
#define MASTER_GPIO 8
-#define MASTER_IRQ 25
#define SLAVE_GPIO 7
-#define SLAVE_IRQ 24
struct ixp_clock {
struct ixp46x_ts_regs *regs;
@@ -32,9 +32,11 @@ struct ixp_clock {
struct ptp_clock_info caps;
int exts0_enabled;
int exts1_enabled;
+ int slave_irq;
+ int master_irq;
};
-DEFINE_SPINLOCK(register_lock);
+static DEFINE_SPINLOCK(register_lock);
/*
* Register access functions
@@ -275,21 +277,36 @@ static int setup_interrupt(int gpio)
return irq;
}
-static void __exit ptp_ixp_exit(void)
+int ixp46x_ptp_find(struct ixp46x_ts_regs *__iomem *regs, int *phc_index)
{
- free_irq(MASTER_IRQ, &ixp_clock);
- free_irq(SLAVE_IRQ, &ixp_clock);
- ixp46x_phc_index = -1;
- ptp_clock_unregister(ixp_clock.ptp_clock);
+ *regs = ixp_clock.regs;
+ *phc_index = ptp_clock_index(ixp_clock.ptp_clock);
+
+ if (!ixp_clock.ptp_clock)
+ return -EPROBE_DEFER;
+
+ return 0;
}
+EXPORT_SYMBOL_GPL(ixp46x_ptp_find);
-static int __init ptp_ixp_init(void)
+static int ptp_ixp_remove(struct platform_device *pdev)
{
- if (!cpu_is_ixp46x())
- return -ENODEV;
+ free_irq(ixp_clock.master_irq, &ixp_clock);
+ free_irq(ixp_clock.slave_irq, &ixp_clock);
+ ptp_clock_unregister(ixp_clock.ptp_clock);
+ ixp_clock.ptp_clock = NULL;
- ixp_clock.regs =
- (struct ixp46x_ts_regs __iomem *) IXP4XX_TIMESYNC_BASE_VIRT;
+ return 0;
+}
+
+static int ptp_ixp_probe(struct platform_device *pdev)
+{
+ ixp_clock.regs = devm_platform_ioremap_resource(pdev, 0);
+ ixp_clock.master_irq = platform_get_irq(pdev, 0);
+ ixp_clock.slave_irq = platform_get_irq(pdev, 1);
+ if (IS_ERR(ixp_clock.regs) ||
+ !ixp_clock.master_irq || !ixp_clock.slave_irq)
+ return -ENXIO;
ixp_clock.caps = ptp_ixp_caps;
@@ -298,32 +315,36 @@ static int __init ptp_ixp_init(void)
if (IS_ERR(ixp_clock.ptp_clock))
return PTR_ERR(ixp_clock.ptp_clock);
- ixp46x_phc_index = ptp_clock_index(ixp_clock.ptp_clock);
-
__raw_writel(DEFAULT_ADDEND, &ixp_clock.regs->addend);
__raw_writel(1, &ixp_clock.regs->trgt_lo);
__raw_writel(0, &ixp_clock.regs->trgt_hi);
__raw_writel(TTIPEND, &ixp_clock.regs->event);
- if (MASTER_IRQ != setup_interrupt(MASTER_GPIO)) {
+ if (ixp_clock.master_irq != setup_interrupt(MASTER_GPIO)) {
pr_err("failed to setup gpio %d as irq\n", MASTER_GPIO);
goto no_master;
}
- if (SLAVE_IRQ != setup_interrupt(SLAVE_GPIO)) {
+ if (ixp_clock.slave_irq != setup_interrupt(SLAVE_GPIO)) {
pr_err("failed to setup gpio %d as irq\n", SLAVE_GPIO);
goto no_slave;
}
return 0;
no_slave:
- free_irq(MASTER_IRQ, &ixp_clock);
+ free_irq(ixp_clock.master_irq, &ixp_clock);
no_master:
ptp_clock_unregister(ixp_clock.ptp_clock);
+ ixp_clock.ptp_clock = NULL;
return -ENODEV;
}
-module_init(ptp_ixp_init);
-module_exit(ptp_ixp_exit);
+static struct platform_driver ptp_ixp_driver = {
+ .driver.name = "ptp-ixp46x",
+ .driver.suppress_bind_attrs = true,
+ .probe = ptp_ixp_probe,
+ .remove = ptp_ixp_remove,
+};
+module_platform_driver(ptp_ixp_driver);
MODULE_AUTHOR("Richard Cochran <richardcochran@...il.com>");
MODULE_DESCRIPTION("PTP clock using the IXP46X timer");
--
2.31.1
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