renegade-project/linux-next
2
0
Fork 0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-18 02:04:05 +08:00
Code
5135e96a3d
linux-next/drivers/net/ethernet/microchip/lan743x_ptp.c
Roelof Berg 6f197fb638 lan743x: Added fixed link and RGMII support 
Microchip lan7431 is frequently connected to a phy. However, it
can also be directly connected to a MII remote peer without
any phy in between. For supporting such a phyless hardware setup
in Linux we utilized phylib, which supports a fixed-link
configuration via the device tree. And we added support for
defining the connection type R/GMII in the device tree.

New behavior:
-------------
. The automatic speed and duplex detection of the lan743x silicon
  between mac and phy is disabled. Instead phylib is used like in
  other typical Linux drivers. The usage of phylib allows to
  specify fixed-link parameters in the device tree.

. The device tree entry phy-connection-type is supported now with
  the modes RGMII or (G)MII (default).

Development state:
------------------
. Tested with fixed-phy configurations. Not yet tested in normal
  configurations with phy. Microchip kindly offered testing
  as soon as the Corona measures allow this.

. All review findings of Andrew Lunn are included

Example:
--------
&pcie {
	status = "okay";

	host@0 {
		reg = <0 0 0 0 0>;

		#address-cells = <3>;
		#size-cells = <2>;

		ethernet@0 {
			compatible = "weyland-yutani,noscom1", "microchip,lan743x";
			status = "okay";
			reg = <0 0 0 0 0>;
			phy-connection-type = "rgmii";

			fixed-link {
				speed = <100>;
				full-duplex;
			};
		};
	};
};

Signed-off-by: Roelof Berg <rberg@berg-solutions.de>
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-06-01 11:51:17 -07:00

1283 lines
35 KiB
C
Raw Blame History

/* SPDX-License-Identifier: GPL-2.0+ */
/* Copyright (C) 2018 Microchip Technology Inc. */
#include <linux/netdevice.h>
#include <linux/ptp_clock_kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/net_tstamp.h>
#include "lan743x_main.h"
#include "lan743x_ptp.h"
#define LAN743X_LED0_ENABLE 20 /* LED0 offset in HW_CFG */
#define LAN743X_LED_ENABLE(pin) BIT(LAN743X_LED0_ENABLE + (pin))
#define LAN743X_PTP_MAX_FREQ_ADJ_IN_PPB (31249999)
#define LAN743X_PTP_MAX_FINE_ADJ_IN_SCALED_PPM (2047999934)
static bool lan743x_ptp_is_enabled(struct lan743x_adapter *adapter);
static void lan743x_ptp_enable(struct lan743x_adapter *adapter);
static void lan743x_ptp_disable(struct lan743x_adapter *adapter);
static void lan743x_ptp_reset(struct lan743x_adapter *adapter);
static void lan743x_ptp_clock_set(struct lan743x_adapter *adapter,
u32 seconds, u32 nano_seconds,
u32 sub_nano_seconds);
int lan743x_gpio_init(struct lan743x_adapter *adapter)
{
struct lan743x_gpio *gpio = &adapter->gpio;
spin_lock_init(&gpio->gpio_lock);
gpio->gpio_cfg0 = 0; /* set all direction to input, data = 0 */
gpio->gpio_cfg1 = 0x0FFF0000;/* disable all gpio, set to open drain */
gpio->gpio_cfg2 = 0;/* set all to 1588 low polarity level */
gpio->gpio_cfg3 = 0;/* disable all 1588 output */
lan743x_csr_write(adapter, GPIO_CFG0, gpio->gpio_cfg0);
lan743x_csr_write(adapter, GPIO_CFG1, gpio->gpio_cfg1);
lan743x_csr_write(adapter, GPIO_CFG2, gpio->gpio_cfg2);
lan743x_csr_write(adapter, GPIO_CFG3, gpio->gpio_cfg3);
return 0;
}
static void lan743x_ptp_wait_till_cmd_done(struct lan743x_adapter *adapter,
u32 bit_mask)
{
int timeout = 1000;
u32 data = 0;
while (timeout &&
(data = (lan743x_csr_read(adapter, PTP_CMD_CTL) &
bit_mask))) {
usleep_range(1000, 20000);
timeout--;
}
if (data) {
netif_err(adapter, drv, adapter->netdev,
"timeout waiting for cmd to be done, cmd = 0x%08X\n",
bit_mask);
}
}
static void lan743x_ptp_tx_ts_enqueue_ts(struct lan743x_adapter *adapter,
u32 seconds, u32 nano_seconds,
u32 header)
{
struct lan743x_ptp *ptp = &adapter->ptp;
spin_lock_bh(&ptp->tx_ts_lock);
if (ptp->tx_ts_queue_size < LAN743X_PTP_NUMBER_OF_TX_TIMESTAMPS) {
ptp->tx_ts_seconds_queue[ptp->tx_ts_queue_size] = seconds;
ptp->tx_ts_nseconds_queue[ptp->tx_ts_queue_size] = nano_seconds;
ptp->tx_ts_header_queue[ptp->tx_ts_queue_size] = header;
ptp->tx_ts_queue_size++;
} else {
netif_err(adapter, drv, adapter->netdev,
"tx ts queue overflow\n");
}
spin_unlock_bh(&ptp->tx_ts_lock);
}
static void lan743x_ptp_tx_ts_complete(struct lan743x_adapter *adapter)
{
struct lan743x_ptp *ptp = &adapter->ptp;
struct skb_shared_hwtstamps tstamps;
u32 header, nseconds, seconds;
bool ignore_sync = false;
struct sk_buff *skb;
int c, i;
spin_lock_bh(&ptp->tx_ts_lock);
c = ptp->tx_ts_skb_queue_size;
if (c > ptp->tx_ts_queue_size)
c = ptp->tx_ts_queue_size;
if (c <= 0)
goto done;
for (i = 0; i < c; i++) {
ignore_sync = ((ptp->tx_ts_ignore_sync_queue &
BIT(i)) != 0);
skb = ptp->tx_ts_skb_queue[i];
nseconds = ptp->tx_ts_nseconds_queue[i];
seconds = ptp->tx_ts_seconds_queue[i];
header = ptp->tx_ts_header_queue[i];
memset(&tstamps, 0, sizeof(tstamps));
tstamps.hwtstamp = ktime_set(seconds, nseconds);
if (!ignore_sync ||
((header & PTP_TX_MSG_HEADER_MSG_TYPE_) !=
PTP_TX_MSG_HEADER_MSG_TYPE_SYNC_))
skb_tstamp_tx(skb, &tstamps);
dev_kfree_skb(skb);
ptp->tx_ts_skb_queue[i] = NULL;
ptp->tx_ts_seconds_queue[i] = 0;
ptp->tx_ts_nseconds_queue[i] = 0;
ptp->tx_ts_header_queue[i] = 0;
}
/* shift queue */
ptp->tx_ts_ignore_sync_queue >>= c;
for (i = c; i < LAN743X_PTP_NUMBER_OF_TX_TIMESTAMPS; i++) {
ptp->tx_ts_skb_queue[i - c] = ptp->tx_ts_skb_queue[i];
ptp->tx_ts_seconds_queue[i - c] = ptp->tx_ts_seconds_queue[i];
ptp->tx_ts_nseconds_queue[i - c] = ptp->tx_ts_nseconds_queue[i];
ptp->tx_ts_header_queue[i - c] = ptp->tx_ts_header_queue[i];
ptp->tx_ts_skb_queue[i] = NULL;
ptp->tx_ts_seconds_queue[i] = 0;
ptp->tx_ts_nseconds_queue[i] = 0;
ptp->tx_ts_header_queue[i] = 0;
}
ptp->tx_ts_skb_queue_size -= c;
ptp->tx_ts_queue_size -= c;
done:
ptp->pending_tx_timestamps -= c;
spin_unlock_bh(&ptp->tx_ts_lock);
}
static int lan743x_ptp_reserve_event_ch(struct lan743x_adapter *adapter,
int event_channel)
{
struct lan743x_ptp *ptp = &adapter->ptp;
int result = -ENODEV;
mutex_lock(&ptp->command_lock);
if (!(test_bit(event_channel, &ptp->used_event_ch))) {
ptp->used_event_ch |= BIT(event_channel);
result = event_channel;
} else {
netif_warn(adapter, drv, adapter->netdev,
"attempted to reserved a used event_channel = %d\n",
event_channel);
}
mutex_unlock(&ptp->command_lock);
return result;
}
static void lan743x_ptp_release_event_ch(struct lan743x_adapter *adapter,
int event_channel)
{
struct lan743x_ptp *ptp = &adapter->ptp;
mutex_lock(&ptp->command_lock);
if (test_bit(event_channel, &ptp->used_event_ch)) {
ptp->used_event_ch &= ~BIT(event_channel);
} else {
netif_warn(adapter, drv, adapter->netdev,
"attempted release on a not used event_channel = %d\n",
event_channel);
}
mutex_unlock(&ptp->command_lock);
}
static void lan743x_ptp_clock_get(struct lan743x_adapter *adapter,
u32 *seconds, u32 *nano_seconds,
u32 *sub_nano_seconds);
static void lan743x_ptp_clock_step(struct lan743x_adapter *adapter,
s64 time_step_ns);
static void lan743x_led_mux_enable(struct lan743x_adapter *adapter,
int pin, bool enable)
{
struct lan743x_ptp *ptp = &adapter->ptp;
if (ptp->leds_multiplexed &&
ptp->led_enabled[pin]) {
u32 val = lan743x_csr_read(adapter, HW_CFG);
if (enable)
val |= LAN743X_LED_ENABLE(pin);
else
val &= ~LAN743X_LED_ENABLE(pin);
lan743x_csr_write(adapter, HW_CFG, val);
}
}
static void lan743x_led_mux_save(struct lan743x_adapter *adapter)
{
struct lan743x_ptp *ptp = &adapter->ptp;
u32 id_rev = adapter->csr.id_rev & ID_REV_ID_MASK_;
if (id_rev == ID_REV_ID_LAN7430_) {
int i;
u32 val = lan743x_csr_read(adapter, HW_CFG);
for (i = 0; i < LAN7430_N_LED; i++) {
bool led_enabled = (val & LAN743X_LED_ENABLE(i)) != 0;
ptp->led_enabled[i] = led_enabled;
}
ptp->leds_multiplexed = true;
} else {
ptp->leds_multiplexed = false;
}
}
static void lan743x_led_mux_restore(struct lan743x_adapter *adapter)
{
u32 id_rev = adapter->csr.id_rev & ID_REV_ID_MASK_;
if (id_rev == ID_REV_ID_LAN7430_) {
int i;
for (i = 0; i < LAN7430_N_LED; i++)
lan743x_led_mux_enable(adapter, i, true);
}
}
static int lan743x_gpio_rsrv_ptp_out(struct lan743x_adapter *adapter,
int pin, int event_channel)
{
struct lan743x_gpio *gpio = &adapter->gpio;
unsigned long irq_flags = 0;
int bit_mask = BIT(pin);
int ret = -EBUSY;
spin_lock_irqsave(&gpio->gpio_lock, irq_flags);
if (!(gpio->used_bits & bit_mask)) {
gpio->used_bits |= bit_mask;
gpio->output_bits |= bit_mask;
gpio->ptp_bits |= bit_mask;
/* assign pin to GPIO function */
lan743x_led_mux_enable(adapter, pin, false);
/* set as output, and zero initial value */
gpio->gpio_cfg0 |= GPIO_CFG0_GPIO_DIR_BIT_(pin);
gpio->gpio_cfg0 &= ~GPIO_CFG0_GPIO_DATA_BIT_(pin);
lan743x_csr_write(adapter, GPIO_CFG0, gpio->gpio_cfg0);
/* enable gpio, and set buffer type to push pull */
gpio->gpio_cfg1 &= ~GPIO_CFG1_GPIOEN_BIT_(pin);
gpio->gpio_cfg1 |= GPIO_CFG1_GPIOBUF_BIT_(pin);
lan743x_csr_write(adapter, GPIO_CFG1, gpio->gpio_cfg1);
/* set 1588 polarity to high */
gpio->gpio_cfg2 |= GPIO_CFG2_1588_POL_BIT_(pin);
lan743x_csr_write(adapter, GPIO_CFG2, gpio->gpio_cfg2);
if (event_channel == 0) {
/* use channel A */
gpio->gpio_cfg3 &= ~GPIO_CFG3_1588_CH_SEL_BIT_(pin);
} else {
/* use channel B */
gpio->gpio_cfg3 |= GPIO_CFG3_1588_CH_SEL_BIT_(pin);
}
gpio->gpio_cfg3 |= GPIO_CFG3_1588_OE_BIT_(pin);
lan743x_csr_write(adapter, GPIO_CFG3, gpio->gpio_cfg3);
ret = pin;
}
spin_unlock_irqrestore(&gpio->gpio_lock, irq_flags);
return ret;
}
static void lan743x_gpio_release(struct lan743x_adapter *adapter, int pin)
{
struct lan743x_gpio *gpio = &adapter->gpio;
unsigned long irq_flags = 0;
int bit_mask = BIT(pin);
spin_lock_irqsave(&gpio->gpio_lock, irq_flags);
if (gpio->used_bits & bit_mask) {
gpio->used_bits &= ~bit_mask;
if (gpio->output_bits & bit_mask) {
gpio->output_bits &= ~bit_mask;
if (gpio->ptp_bits & bit_mask) {
gpio->ptp_bits &= ~bit_mask;
/* disable ptp output */
gpio->gpio_cfg3 &= ~GPIO_CFG3_1588_OE_BIT_(pin);
lan743x_csr_write(adapter, GPIO_CFG3,
gpio->gpio_cfg3);
}
/* release gpio output */
/* disable gpio */
gpio->gpio_cfg1 |= GPIO_CFG1_GPIOEN_BIT_(pin);
gpio->gpio_cfg1 &= ~GPIO_CFG1_GPIOBUF_BIT_(pin);
lan743x_csr_write(adapter, GPIO_CFG1, gpio->gpio_cfg1);
/* reset back to input */
gpio->gpio_cfg0 &= ~GPIO_CFG0_GPIO_DIR_BIT_(pin);
gpio->gpio_cfg0 &= ~GPIO_CFG0_GPIO_DATA_BIT_(pin);
lan743x_csr_write(adapter, GPIO_CFG0, gpio->gpio_cfg0);
/* assign pin to original function */
lan743x_led_mux_enable(adapter, pin, true);
}
}
spin_unlock_irqrestore(&gpio->gpio_lock, irq_flags);
}
static int lan743x_ptpci_adjfine(struct ptp_clock_info *ptpci, long scaled_ppm)
{
struct lan743x_ptp *ptp =
container_of(ptpci, struct lan743x_ptp, ptp_clock_info);
struct lan743x_adapter *adapter =
container_of(ptp, struct lan743x_adapter, ptp);
u32 lan743x_rate_adj = 0;
bool positive = true;
u64 u64_delta = 0;
if ((scaled_ppm < (-LAN743X_PTP_MAX_FINE_ADJ_IN_SCALED_PPM)) ||
scaled_ppm > LAN743X_PTP_MAX_FINE_ADJ_IN_SCALED_PPM) {
return -EINVAL;
}
if (scaled_ppm > 0) {
u64_delta = (u64)scaled_ppm;
positive = true;
} else {
u64_delta = (u64)(-scaled_ppm);
positive = false;
}
u64_delta = (u64_delta << 19);
lan743x_rate_adj = div_u64(u64_delta, 1000000);
if (positive)
lan743x_rate_adj |= PTP_CLOCK_RATE_ADJ_DIR_;
lan743x_csr_write(adapter, PTP_CLOCK_RATE_ADJ,
lan743x_rate_adj);
return 0;
}
static int lan743x_ptpci_adjfreq(struct ptp_clock_info *ptpci, s32 delta_ppb)
{
struct lan743x_ptp *ptp =
container_of(ptpci, struct lan743x_ptp, ptp_clock_info);
struct lan743x_adapter *adapter =
container_of(ptp, struct lan743x_adapter, ptp);
u32 lan743x_rate_adj = 0;
bool positive = true;
u32 u32_delta = 0;
u64 u64_delta = 0;
if ((delta_ppb < (-LAN743X_PTP_MAX_FREQ_ADJ_IN_PPB)) ||
delta_ppb > LAN743X_PTP_MAX_FREQ_ADJ_IN_PPB) {
return -EINVAL;
}
if (delta_ppb > 0) {
u32_delta = (u32)delta_ppb;
positive = true;
} else {
u32_delta = (u32)(-delta_ppb);
positive = false;
}
u64_delta = (((u64)u32_delta) << 35);
lan743x_rate_adj = div_u64(u64_delta, 1000000000);
if (positive)
lan743x_rate_adj |= PTP_CLOCK_RATE_ADJ_DIR_;
lan743x_csr_write(adapter, PTP_CLOCK_RATE_ADJ,
lan743x_rate_adj);
return 0;
}
static int lan743x_ptpci_adjtime(struct ptp_clock_info *ptpci, s64 delta)
{
struct lan743x_ptp *ptp =
container_of(ptpci, struct lan743x_ptp, ptp_clock_info);
struct lan743x_adapter *adapter =
container_of(ptp, struct lan743x_adapter, ptp);
lan743x_ptp_clock_step(adapter, delta);
return 0;
}
static int lan743x_ptpci_gettime64(struct ptp_clock_info *ptpci,
struct timespec64 *ts)
{
struct lan743x_ptp *ptp =
container_of(ptpci, struct lan743x_ptp, ptp_clock_info);
struct lan743x_adapter *adapter =
container_of(ptp, struct lan743x_adapter, ptp);
u32 nano_seconds = 0;
u32 seconds = 0;
lan743x_ptp_clock_get(adapter, &seconds, &nano_seconds, NULL);
ts->tv_sec = seconds;
ts->tv_nsec = nano_seconds;
return 0;
}
static int lan743x_ptpci_settime64(struct ptp_clock_info *ptpci,
const struct timespec64 *ts)
{
struct lan743x_ptp *ptp =
container_of(ptpci, struct lan743x_ptp, ptp_clock_info);
struct lan743x_adapter *adapter =
container_of(ptp, struct lan743x_adapter, ptp);
u32 nano_seconds = 0;
u32 seconds = 0;
if (ts) {
if (ts->tv_sec > 0xFFFFFFFFLL ||
ts->tv_sec < 0) {
netif_warn(adapter, drv, adapter->netdev,
"ts->tv_sec out of range, %lld\n",
ts->tv_sec);
return -ERANGE;
}
if (ts->tv_nsec >= 1000000000L ||
ts->tv_nsec < 0) {
netif_warn(adapter, drv, adapter->netdev,
"ts->tv_nsec out of range, %ld\n",
ts->tv_nsec);
return -ERANGE;
}
seconds = ts->tv_sec;
nano_seconds = ts->tv_nsec;
lan743x_ptp_clock_set(adapter, seconds, nano_seconds, 0);
} else {
netif_warn(adapter, drv, adapter->netdev, "ts == NULL\n");
return -EINVAL;
}
return 0;
}
static void lan743x_ptp_perout_off(struct lan743x_adapter *adapter,
unsigned int index)
{
struct lan743x_ptp *ptp = &adapter->ptp;
u32 general_config = 0;
struct lan743x_ptp_perout *perout = &ptp->perout[index];
if (perout->gpio_pin >= 0) {
lan743x_gpio_release(adapter, perout->gpio_pin);
perout->gpio_pin = -1;
}
if (perout->event_ch >= 0) {
/* set target to far in the future, effectively disabling it */
lan743x_csr_write(adapter,
PTP_CLOCK_TARGET_SEC_X(perout->event_ch),
0xFFFF0000);
lan743x_csr_write(adapter,
PTP_CLOCK_TARGET_NS_X(perout->event_ch),
0);
general_config = lan743x_csr_read(adapter, PTP_GENERAL_CONFIG);
general_config |= PTP_GENERAL_CONFIG_RELOAD_ADD_X_
(perout->event_ch);
lan743x_csr_write(adapter, PTP_GENERAL_CONFIG, general_config);
lan743x_ptp_release_event_ch(adapter, perout->event_ch);
perout->event_ch = -1;
}
}
static int lan743x_ptp_perout(struct lan743x_adapter *adapter, int on,
struct ptp_perout_request *perout_request)
{
struct lan743x_ptp *ptp = &adapter->ptp;
u32 period_sec = 0, period_nsec = 0;
u32 start_sec = 0, start_nsec = 0;
u32 general_config = 0;
int pulse_width = 0;
int perout_pin = 0;
unsigned int index = perout_request->index;
struct lan743x_ptp_perout *perout = &ptp->perout[index];
/* Reject requests with unsupported flags */
if (perout_request->flags)
return -EOPNOTSUPP;
if (on) {
perout_pin = ptp_find_pin(ptp->ptp_clock, PTP_PF_PEROUT,
perout_request->index);
if (perout_pin < 0)
return -EBUSY;
} else {
lan743x_ptp_perout_off(adapter, index);
return 0;
}
if (perout->event_ch >= 0 ||
perout->gpio_pin >= 0) {
/* already on, turn off first */
lan743x_ptp_perout_off(adapter, index);
}
perout->event_ch = lan743x_ptp_reserve_event_ch(adapter, index);
if (perout->event_ch < 0) {
netif_warn(adapter, drv, adapter->netdev,
"Failed to reserve event channel %d for PEROUT\n",
index);
goto failed;
}
perout->gpio_pin = lan743x_gpio_rsrv_ptp_out(adapter,
perout_pin,
perout->event_ch);
if (perout->gpio_pin < 0) {
netif_warn(adapter, drv, adapter->netdev,
"Failed to reserve gpio %d for PEROUT\n",
perout_pin);
goto failed;
}
start_sec = perout_request->start.sec;
start_sec += perout_request->start.nsec / 1000000000;
start_nsec = perout_request->start.nsec % 1000000000;
period_sec = perout_request->period.sec;
period_sec += perout_request->period.nsec / 1000000000;
period_nsec = perout_request->period.nsec % 1000000000;
if (period_sec == 0) {
if (period_nsec >= 400000000) {
pulse_width = PTP_GENERAL_CONFIG_CLOCK_EVENT_200MS_;
} else if (period_nsec >= 20000000) {
pulse_width = PTP_GENERAL_CONFIG_CLOCK_EVENT_10MS_;
} else if (period_nsec >= 2000000) {
pulse_width = PTP_GENERAL_CONFIG_CLOCK_EVENT_1MS_;
} else if (period_nsec >= 200000) {
pulse_width = PTP_GENERAL_CONFIG_CLOCK_EVENT_100US_;
} else if (period_nsec >= 20000) {
pulse_width = PTP_GENERAL_CONFIG_CLOCK_EVENT_10US_;
} else if (period_nsec >= 200) {
pulse_width = PTP_GENERAL_CONFIG_CLOCK_EVENT_100NS_;
} else {
netif_warn(adapter, drv, adapter->netdev,
"perout period too small, minimum is 200nS\n");
goto failed;
}
} else {
pulse_width = PTP_GENERAL_CONFIG_CLOCK_EVENT_200MS_;
}
/* turn off by setting target far in future */
lan743x_csr_write(adapter,
PTP_CLOCK_TARGET_SEC_X(perout->event_ch),
0xFFFF0000);
lan743x_csr_write(adapter,
PTP_CLOCK_TARGET_NS_X(perout->event_ch), 0);
/* Configure to pulse every period */
general_config = lan743x_csr_read(adapter, PTP_GENERAL_CONFIG);
general_config &= ~(PTP_GENERAL_CONFIG_CLOCK_EVENT_X_MASK_
(perout->event_ch));
general_config |= PTP_GENERAL_CONFIG_CLOCK_EVENT_X_SET_
(perout->event_ch, pulse_width);
general_config &= ~PTP_GENERAL_CONFIG_RELOAD_ADD_X_
(perout->event_ch);
lan743x_csr_write(adapter, PTP_GENERAL_CONFIG, general_config);
/* set the reload to one toggle cycle */
lan743x_csr_write(adapter,
PTP_CLOCK_TARGET_RELOAD_SEC_X(perout->event_ch),
period_sec);
lan743x_csr_write(adapter,
PTP_CLOCK_TARGET_RELOAD_NS_X(perout->event_ch),
period_nsec);
/* set the start time */
lan743x_csr_write(adapter,
PTP_CLOCK_TARGET_SEC_X(perout->event_ch),
start_sec);
lan743x_csr_write(adapter,
PTP_CLOCK_TARGET_NS_X(perout->event_ch),
start_nsec);
return 0;
failed:
lan743x_ptp_perout_off(adapter, index);
return -ENODEV;
}
static int lan743x_ptpci_enable(struct ptp_clock_info *ptpci,
struct ptp_clock_request *request, int on)
{
struct lan743x_ptp *ptp =
container_of(ptpci, struct lan743x_ptp, ptp_clock_info);
struct lan743x_adapter *adapter =
container_of(ptp, struct lan743x_adapter, ptp);
if (request) {
switch (request->type) {
case PTP_CLK_REQ_EXTTS:
return -EINVAL;
case PTP_CLK_REQ_PEROUT:
if (request->perout.index < ptpci->n_per_out)
return lan743x_ptp_perout(adapter, on,
&request->perout);
return -EINVAL;
case PTP_CLK_REQ_PPS:
return -EINVAL;
default:
netif_err(adapter, drv, adapter->netdev,
"request->type == %d, Unknown\n",
request->type);
break;
}
} else {
netif_err(adapter, drv, adapter->netdev, "request == NULL\n");
}
return 0;
}
static int lan743x_ptpci_verify_pin_config(struct ptp_clock_info *ptp,
unsigned int pin,
enum ptp_pin_function func,
unsigned int chan)
{
int result = 0;
/* Confirm the requested function is supported. Parameter
* validation is done by the caller.
*/
switch (func) {
case PTP_PF_NONE:
case PTP_PF_PEROUT:
break;
case PTP_PF_EXTTS:
case PTP_PF_PHYSYNC:
default:
result = -1;
break;
}
return result;
}
static long lan743x_ptpci_do_aux_work(struct ptp_clock_info *ptpci)
{
struct lan743x_ptp *ptp =
container_of(ptpci, struct lan743x_ptp, ptp_clock_info);
struct lan743x_adapter *adapter =
container_of(ptp, struct lan743x_adapter, ptp);
u32 cap_info, cause, header, nsec, seconds;
bool new_timestamp_available = false;
int count = 0;
while ((count < 100) &&
(lan743x_csr_read(adapter, PTP_INT_STS) & PTP_INT_BIT_TX_TS_)) {
count++;
cap_info = lan743x_csr_read(adapter, PTP_CAP_INFO);
if (PTP_CAP_INFO_TX_TS_CNT_GET_(cap_info) > 0) {
seconds = lan743x_csr_read(adapter,
PTP_TX_EGRESS_SEC);
nsec = lan743x_csr_read(adapter, PTP_TX_EGRESS_NS);
cause = (nsec &
PTP_TX_EGRESS_NS_CAPTURE_CAUSE_MASK_);
header = lan743x_csr_read(adapter,
PTP_TX_MSG_HEADER);
if (cause == PTP_TX_EGRESS_NS_CAPTURE_CAUSE_SW_) {
nsec &= PTP_TX_EGRESS_NS_TS_NS_MASK_;
lan743x_ptp_tx_ts_enqueue_ts(adapter,
seconds, nsec,
header);
new_timestamp_available = true;
} else if (cause ==
PTP_TX_EGRESS_NS_CAPTURE_CAUSE_AUTO_) {
netif_err(adapter, drv, adapter->netdev,
"Auto capture cause not supported\n");
} else {
netif_warn(adapter, drv, adapter->netdev,
"unknown tx timestamp capture cause\n");
}
} else {
netif_warn(adapter, drv, adapter->netdev,
"TX TS INT but no TX TS CNT\n");
}
lan743x_csr_write(adapter, PTP_INT_STS, PTP_INT_BIT_TX_TS_);
}
if (new_timestamp_available)
lan743x_ptp_tx_ts_complete(adapter);
lan743x_csr_write(adapter, INT_EN_SET, INT_BIT_1588_);
return -1;
}
static void lan743x_ptp_clock_get(struct lan743x_adapter *adapter,
u32 *seconds, u32 *nano_seconds,
u32 *sub_nano_seconds)
{
struct lan743x_ptp *ptp = &adapter->ptp;
mutex_lock(&ptp->command_lock);
lan743x_csr_write(adapter, PTP_CMD_CTL, PTP_CMD_CTL_PTP_CLOCK_READ_);
lan743x_ptp_wait_till_cmd_done(adapter, PTP_CMD_CTL_PTP_CLOCK_READ_);
if (seconds)
(*seconds) = lan743x_csr_read(adapter, PTP_CLOCK_SEC);
if (nano_seconds)
(*nano_seconds) = lan743x_csr_read(adapter, PTP_CLOCK_NS);
if (sub_nano_seconds)
(*sub_nano_seconds) =
lan743x_csr_read(adapter, PTP_CLOCK_SUBNS);
mutex_unlock(&ptp->command_lock);
}
static void lan743x_ptp_clock_step(struct lan743x_adapter *adapter,
s64 time_step_ns)
{
struct lan743x_ptp *ptp = &adapter->ptp;
u32 nano_seconds_step = 0;
u64 abs_time_step_ns = 0;
u32 unsigned_seconds = 0;
u32 nano_seconds = 0;
u32 remainder = 0;
s32 seconds = 0;
if (time_step_ns > 15000000000LL) {
/* convert to clock set */
lan743x_ptp_clock_get(adapter, &unsigned_seconds,
&nano_seconds, NULL);
unsigned_seconds += div_u64_rem(time_step_ns, 1000000000LL,
&remainder);
nano_seconds += remainder;
if (nano_seconds >= 1000000000) {
unsigned_seconds++;
nano_seconds -= 1000000000;
}
lan743x_ptp_clock_set(adapter, unsigned_seconds,
nano_seconds, 0);
return;
} else if (time_step_ns < -15000000000LL) {
/* convert to clock set */
time_step_ns = -time_step_ns;
lan743x_ptp_clock_get(adapter, &unsigned_seconds,
&nano_seconds, NULL);
unsigned_seconds -= div_u64_rem(time_step_ns, 1000000000LL,
&remainder);
nano_seconds_step = remainder;
if (nano_seconds < nano_seconds_step) {
unsigned_seconds--;
nano_seconds += 1000000000;
}
nano_seconds -= nano_seconds_step;
lan743x_ptp_clock_set(adapter, unsigned_seconds,
nano_seconds, 0);
return;
}
/* do clock step */
if (time_step_ns >= 0) {
abs_time_step_ns = (u64)(time_step_ns);
seconds = (s32)div_u64_rem(abs_time_step_ns, 1000000000,
&remainder);
nano_seconds = (u32)remainder;
} else {
abs_time_step_ns = (u64)(-time_step_ns);
seconds = -((s32)div_u64_rem(abs_time_step_ns, 1000000000,
&remainder));
nano_seconds = (u32)remainder;
if (nano_seconds > 0) {
/* subtracting nano seconds is not allowed
* convert to subtracting from seconds,
* and adding to nanoseconds
*/
seconds--;
nano_seconds = (1000000000 - nano_seconds);
}
}
if (nano_seconds > 0) {
/* add 8 ns to cover the likely normal increment */
nano_seconds += 8;
}
if (nano_seconds >= 1000000000) {
/* carry into seconds */
seconds++;
nano_seconds -= 1000000000;
}
while (seconds) {
mutex_lock(&ptp->command_lock);
if (seconds > 0) {
u32 adjustment_value = (u32)seconds;
if (adjustment_value > 0xF)
adjustment_value = 0xF;
lan743x_csr_write(adapter, PTP_CLOCK_STEP_ADJ,
PTP_CLOCK_STEP_ADJ_DIR_ |
adjustment_value);
seconds -= ((s32)adjustment_value);
} else {
u32 adjustment_value = (u32)(-seconds);
if (adjustment_value > 0xF)
adjustment_value = 0xF;
lan743x_csr_write(adapter, PTP_CLOCK_STEP_ADJ,
adjustment_value);
seconds += ((s32)adjustment_value);
}
lan743x_csr_write(adapter, PTP_CMD_CTL,
PTP_CMD_CTL_PTP_CLOCK_STEP_SEC_);
lan743x_ptp_wait_till_cmd_done(adapter,
PTP_CMD_CTL_PTP_CLOCK_STEP_SEC_);
mutex_unlock(&ptp->command_lock);
}
if (nano_seconds) {
mutex_lock(&ptp->command_lock);
lan743x_csr_write(adapter, PTP_CLOCK_STEP_ADJ,
PTP_CLOCK_STEP_ADJ_DIR_ |
(nano_seconds &
PTP_CLOCK_STEP_ADJ_VALUE_MASK_));
lan743x_csr_write(adapter, PTP_CMD_CTL,
PTP_CMD_CTL_PTP_CLK_STP_NSEC_);
lan743x_ptp_wait_till_cmd_done(adapter,
PTP_CMD_CTL_PTP_CLK_STP_NSEC_);
mutex_unlock(&ptp->command_lock);
}
}
void lan743x_ptp_isr(void *context)
{
struct lan743x_adapter *adapter = (struct lan743x_adapter *)context;
struct lan743x_ptp *ptp = NULL;
int enable_flag = 1;
u32 ptp_int_sts = 0;
ptp = &adapter->ptp;
lan743x_csr_write(adapter, INT_EN_CLR, INT_BIT_1588_);
ptp_int_sts = lan743x_csr_read(adapter, PTP_INT_STS);
ptp_int_sts &= lan743x_csr_read(adapter, PTP_INT_EN_SET);
if (ptp_int_sts & PTP_INT_BIT_TX_TS_) {
ptp_schedule_worker(ptp->ptp_clock, 0);
enable_flag = 0;/* tasklet will re-enable later */
}
if (ptp_int_sts & PTP_INT_BIT_TX_SWTS_ERR_) {
netif_err(adapter, drv, adapter->netdev,
"PTP TX Software Timestamp Error\n");
/* clear int status bit */
lan743x_csr_write(adapter, PTP_INT_STS,
PTP_INT_BIT_TX_SWTS_ERR_);
}
if (ptp_int_sts & PTP_INT_BIT_TIMER_B_) {
/* clear int status bit */
lan743x_csr_write(adapter, PTP_INT_STS,
PTP_INT_BIT_TIMER_B_);
}
if (ptp_int_sts & PTP_INT_BIT_TIMER_A_) {
/* clear int status bit */
lan743x_csr_write(adapter, PTP_INT_STS,
PTP_INT_BIT_TIMER_A_);
}
if (enable_flag) {
/* re-enable isr */
lan743x_csr_write(adapter, INT_EN_SET, INT_BIT_1588_);
}
}
static void lan743x_ptp_tx_ts_enqueue_skb(struct lan743x_adapter *adapter,
struct sk_buff *skb, bool ignore_sync)
{
struct lan743x_ptp *ptp = &adapter->ptp;
spin_lock_bh(&ptp->tx_ts_lock);
if (ptp->tx_ts_skb_queue_size < LAN743X_PTP_NUMBER_OF_TX_TIMESTAMPS) {
ptp->tx_ts_skb_queue[ptp->tx_ts_skb_queue_size] = skb;
if (ignore_sync)
ptp->tx_ts_ignore_sync_queue |=
BIT(ptp->tx_ts_skb_queue_size);
ptp->tx_ts_skb_queue_size++;
} else {
/* this should never happen, so long as the tx channel
* calls and honors the result from
* lan743x_ptp_request_tx_timestamp
*/
netif_err(adapter, drv, adapter->netdev,
"tx ts skb queue overflow\n");
dev_kfree_skb(skb);
}
spin_unlock_bh(&ptp->tx_ts_lock);
}
static void lan743x_ptp_sync_to_system_clock(struct lan743x_adapter *adapter)
{
struct timespec64 ts;
ktime_get_clocktai_ts64(&ts);
lan743x_ptp_clock_set(adapter, ts.tv_sec, ts.tv_nsec, 0);
}
void lan743x_ptp_update_latency(struct lan743x_adapter *adapter,
u32 link_speed)
{
switch (link_speed) {
case 10:
lan743x_csr_write(adapter, PTP_LATENCY,
PTP_LATENCY_TX_SET_(0) |
PTP_LATENCY_RX_SET_(0));
break;
case 100:
lan743x_csr_write(adapter, PTP_LATENCY,
PTP_LATENCY_TX_SET_(181) |
PTP_LATENCY_RX_SET_(594));
break;
case 1000:
lan743x_csr_write(adapter, PTP_LATENCY,
PTP_LATENCY_TX_SET_(30) |
PTP_LATENCY_RX_SET_(525));
break;
}
}
int lan743x_ptp_init(struct lan743x_adapter *adapter)
{
struct lan743x_ptp *ptp = &adapter->ptp;
int i;
mutex_init(&ptp->command_lock);
spin_lock_init(&ptp->tx_ts_lock);
ptp->used_event_ch = 0;
for (i = 0; i < LAN743X_PTP_N_EVENT_CHAN; i++) {
ptp->perout[i].event_ch = -1;
ptp->perout[i].gpio_pin = -1;
}
lan743x_led_mux_save(adapter);
return 0;
}
int lan743x_ptp_open(struct lan743x_adapter *adapter)
{
struct lan743x_ptp *ptp = &adapter->ptp;
int ret = -ENODEV;
u32 temp;
int i;
int n_pins;
lan743x_ptp_reset(adapter);
lan743x_ptp_sync_to_system_clock(adapter);
temp = lan743x_csr_read(adapter, PTP_TX_MOD2);
temp |= PTP_TX_MOD2_TX_PTP_CLR_UDPV4_CHKSUM_;
lan743x_csr_write(adapter, PTP_TX_MOD2, temp);
lan743x_ptp_enable(adapter);
lan743x_csr_write(adapter, INT_EN_SET, INT_BIT_1588_);
lan743x_csr_write(adapter, PTP_INT_EN_SET,
PTP_INT_BIT_TX_SWTS_ERR_ | PTP_INT_BIT_TX_TS_);
ptp->flags |= PTP_FLAG_ISR_ENABLED;
if (!IS_ENABLED(CONFIG_PTP_1588_CLOCK))
return 0;
switch (adapter->csr.id_rev & ID_REV_ID_MASK_) {
case ID_REV_ID_LAN7430_:
n_pins = LAN7430_N_GPIO;
break;
case ID_REV_ID_LAN7431_:
n_pins = LAN7431_N_GPIO;
break;
default:
netif_warn(adapter, drv, adapter->netdev,
"Unknown LAN743x (%08x). Assuming no GPIO\n",
adapter->csr.id_rev);
n_pins = 0;
break;
}
if (n_pins > LAN743X_PTP_N_GPIO)
n_pins = LAN743X_PTP_N_GPIO;
for (i = 0; i < n_pins; i++) {
struct ptp_pin_desc *ptp_pin = &ptp->pin_config[i];
snprintf(ptp_pin->name,
sizeof(ptp_pin->name), "lan743x_ptp_pin_%02d", i);
ptp_pin->index = i;
ptp_pin->func = PTP_PF_NONE;
}
ptp->ptp_clock_info.owner = THIS_MODULE;
snprintf(ptp->ptp_clock_info.name, 16, "%pm",
adapter->netdev->dev_addr);
ptp->ptp_clock_info.max_adj = LAN743X_PTP_MAX_FREQ_ADJ_IN_PPB;
ptp->ptp_clock_info.n_alarm = 0;
ptp->ptp_clock_info.n_ext_ts = 0;
ptp->ptp_clock_info.n_per_out = LAN743X_PTP_N_EVENT_CHAN;
ptp->ptp_clock_info.n_pins = n_pins;
ptp->ptp_clock_info.pps = 0;
ptp->ptp_clock_info.pin_config = ptp->pin_config;
ptp->ptp_clock_info.adjfine = lan743x_ptpci_adjfine;
ptp->ptp_clock_info.adjfreq = lan743x_ptpci_adjfreq;
ptp->ptp_clock_info.adjtime = lan743x_ptpci_adjtime;
ptp->ptp_clock_info.gettime64 = lan743x_ptpci_gettime64;
ptp->ptp_clock_info.getcrosststamp = NULL;
ptp->ptp_clock_info.settime64 = lan743x_ptpci_settime64;
ptp->ptp_clock_info.enable = lan743x_ptpci_enable;
ptp->ptp_clock_info.do_aux_work = lan743x_ptpci_do_aux_work;
ptp->ptp_clock_info.verify = lan743x_ptpci_verify_pin_config;
ptp->ptp_clock = ptp_clock_register(&ptp->ptp_clock_info,
&adapter->pdev->dev);
if (IS_ERR(ptp->ptp_clock)) {
netif_err(adapter, ifup, adapter->netdev,
"ptp_clock_register failed\n");
goto done;
}
ptp->flags |= PTP_FLAG_PTP_CLOCK_REGISTERED;
netif_info(adapter, ifup, adapter->netdev,
"successfully registered ptp clock\n");
return 0;
done:
lan743x_ptp_close(adapter);
return ret;
}
void lan743x_ptp_close(struct lan743x_adapter *adapter)
{
struct lan743x_ptp *ptp = &adapter->ptp;
int index;
if (IS_ENABLED(CONFIG_PTP_1588_CLOCK) &&
(ptp->flags & PTP_FLAG_PTP_CLOCK_REGISTERED)) {
ptp_clock_unregister(ptp->ptp_clock);
ptp->ptp_clock = NULL;
ptp->flags &= ~PTP_FLAG_PTP_CLOCK_REGISTERED;
netif_info(adapter, drv, adapter->netdev,
"ptp clock unregister\n");
}
if (ptp->flags & PTP_FLAG_ISR_ENABLED) {
lan743x_csr_write(adapter, PTP_INT_EN_CLR,
PTP_INT_BIT_TX_SWTS_ERR_ |
PTP_INT_BIT_TX_TS_);
lan743x_csr_write(adapter, INT_EN_CLR, INT_BIT_1588_);
ptp->flags &= ~PTP_FLAG_ISR_ENABLED;
}
/* clean up pending timestamp requests */
lan743x_ptp_tx_ts_complete(adapter);
spin_lock_bh(&ptp->tx_ts_lock);
for (index = 0;
index < LAN743X_PTP_NUMBER_OF_TX_TIMESTAMPS;
index++) {
struct sk_buff *skb = ptp->tx_ts_skb_queue[index];
dev_kfree_skb(skb);
ptp->tx_ts_skb_queue[index] = NULL;
ptp->tx_ts_seconds_queue[index] = 0;
ptp->tx_ts_nseconds_queue[index] = 0;
}
ptp->tx_ts_skb_queue_size = 0;
ptp->tx_ts_queue_size = 0;
ptp->pending_tx_timestamps = 0;
spin_unlock_bh(&ptp->tx_ts_lock);
lan743x_led_mux_restore(adapter);
lan743x_ptp_disable(adapter);
}
static void lan743x_ptp_set_sync_ts_insert(struct lan743x_adapter *adapter,
bool ts_insert_enable)
{
u32 ptp_tx_mod = lan743x_csr_read(adapter, PTP_TX_MOD);
if (ts_insert_enable)
ptp_tx_mod |= PTP_TX_MOD_TX_PTP_SYNC_TS_INSERT_;
else
ptp_tx_mod &= ~PTP_TX_MOD_TX_PTP_SYNC_TS_INSERT_;
lan743x_csr_write(adapter, PTP_TX_MOD, ptp_tx_mod);
}
static bool lan743x_ptp_is_enabled(struct lan743x_adapter *adapter)
{
if (lan743x_csr_read(adapter, PTP_CMD_CTL) & PTP_CMD_CTL_PTP_ENABLE_)
return true;
return false;
}
static void lan743x_ptp_enable(struct lan743x_adapter *adapter)
{
struct lan743x_ptp *ptp = &adapter->ptp;
mutex_lock(&ptp->command_lock);
if (lan743x_ptp_is_enabled(adapter)) {
netif_warn(adapter, drv, adapter->netdev,
"PTP already enabled\n");
goto done;
}
lan743x_csr_write(adapter, PTP_CMD_CTL, PTP_CMD_CTL_PTP_ENABLE_);
done:
mutex_unlock(&ptp->command_lock);
}
static void lan743x_ptp_disable(struct lan743x_adapter *adapter)
{
struct lan743x_ptp *ptp = &adapter->ptp;
mutex_lock(&ptp->command_lock);
if (!lan743x_ptp_is_enabled(adapter)) {
netif_warn(adapter, drv, adapter->netdev,
"PTP already disabled\n");
goto done;
}
lan743x_csr_write(adapter, PTP_CMD_CTL, PTP_CMD_CTL_PTP_DISABLE_);
lan743x_ptp_wait_till_cmd_done(adapter, PTP_CMD_CTL_PTP_ENABLE_);
done:
mutex_unlock(&ptp->command_lock);
}
static void lan743x_ptp_reset(struct lan743x_adapter *adapter)
{
struct lan743x_ptp *ptp = &adapter->ptp;
mutex_lock(&ptp->command_lock);
if (lan743x_ptp_is_enabled(adapter)) {
netif_err(adapter, drv, adapter->netdev,
"Attempting reset while enabled\n");
goto done;
}
lan743x_csr_write(adapter, PTP_CMD_CTL, PTP_CMD_CTL_PTP_RESET_);
lan743x_ptp_wait_till_cmd_done(adapter, PTP_CMD_CTL_PTP_RESET_);
done:
mutex_unlock(&ptp->command_lock);
}
static void lan743x_ptp_clock_set(struct lan743x_adapter *adapter,
u32 seconds, u32 nano_seconds,
u32 sub_nano_seconds)
{
struct lan743x_ptp *ptp = &adapter->ptp;
mutex_lock(&ptp->command_lock);
lan743x_csr_write(adapter, PTP_CLOCK_SEC, seconds);
lan743x_csr_write(adapter, PTP_CLOCK_NS, nano_seconds);
lan743x_csr_write(adapter, PTP_CLOCK_SUBNS, sub_nano_seconds);
lan743x_csr_write(adapter, PTP_CMD_CTL, PTP_CMD_CTL_PTP_CLOCK_LOAD_);
lan743x_ptp_wait_till_cmd_done(adapter, PTP_CMD_CTL_PTP_CLOCK_LOAD_);
mutex_unlock(&ptp->command_lock);
}
bool lan743x_ptp_request_tx_timestamp(struct lan743x_adapter *adapter)
{
struct lan743x_ptp *ptp = &adapter->ptp;
bool result = false;
spin_lock_bh(&ptp->tx_ts_lock);
if (ptp->pending_tx_timestamps < LAN743X_PTP_NUMBER_OF_TX_TIMESTAMPS) {
/* request granted */
ptp->pending_tx_timestamps++;
result = true;
}
spin_unlock_bh(&ptp->tx_ts_lock);
return result;
}
void lan743x_ptp_unrequest_tx_timestamp(struct lan743x_adapter *adapter)
{
struct lan743x_ptp *ptp = &adapter->ptp;
spin_lock_bh(&ptp->tx_ts_lock);
if (ptp->pending_tx_timestamps > 0)
ptp->pending_tx_timestamps--;
else
netif_err(adapter, drv, adapter->netdev,
"unrequest failed, pending_tx_timestamps==0\n");
spin_unlock_bh(&ptp->tx_ts_lock);
}
void lan743x_ptp_tx_timestamp_skb(struct lan743x_adapter *adapter,
struct sk_buff *skb, bool ignore_sync)
{
lan743x_ptp_tx_ts_enqueue_skb(adapter, skb, ignore_sync);
lan743x_ptp_tx_ts_complete(adapter);
}
int lan743x_ptp_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
{
struct lan743x_adapter *adapter = netdev_priv(netdev);
struct hwtstamp_config config;
int ret = 0;
int index;
if (!ifr) {
netif_err(adapter, drv, adapter->netdev,
"SIOCSHWTSTAMP, ifr == NULL\n");
return -EINVAL;
}
if (copy_from_user(&config, ifr->ifr_data, sizeof(config)))
return -EFAULT;
if (config.flags) {
netif_warn(adapter, drv, adapter->netdev,
"ignoring hwtstamp_config.flags == 0x%08X, expected 0\n",
config.flags);
}
switch (config.tx_type) {
case HWTSTAMP_TX_OFF:
for (index = 0; index < LAN743X_MAX_TX_CHANNELS;
index++)
lan743x_tx_set_timestamping_mode(&adapter->tx[index],
false, false);
lan743x_ptp_set_sync_ts_insert(adapter, false);
break;
case HWTSTAMP_TX_ON:
for (index = 0; index < LAN743X_MAX_TX_CHANNELS;
index++)
lan743x_tx_set_timestamping_mode(&adapter->tx[index],
true, false);
lan743x_ptp_set_sync_ts_insert(adapter, false);
break;
case HWTSTAMP_TX_ONESTEP_SYNC:
for (index = 0; index < LAN743X_MAX_TX_CHANNELS;
index++)
lan743x_tx_set_timestamping_mode(&adapter->tx[index],
true, true);
lan743x_ptp_set_sync_ts_insert(adapter, true);
break;
case HWTSTAMP_TX_ONESTEP_P2P:
ret = -ERANGE;
break;
default:
netif_warn(adapter, drv, adapter->netdev,
" tx_type = %d, UNKNOWN\n", config.tx_type);
ret = -EINVAL;
break;
}
if (!ret)
return copy_to_user(ifr->ifr_data, &config,
sizeof(config)) ? -EFAULT : 0;
return ret;
}
View Git Blame Copy Permalink