Commit ab91f0a9 authored by Rafal Ozieblo's avatar Rafal Ozieblo Committed by David S. Miller

net: macb: Add hardware PTP support

This patch is based on original Harini's patch and Andrei's patch,
implemented in a separate file to ease the review/maintanance
and integration with other platforms.

This driver supports GEM-GXL:
- Register ptp clock framework
- Initialize PTP related registers
- HW time stamp on the PTP Ethernet packets are received using the
  SO_TIMESTAMPING API. Time stamps are obtained from the dma buffer
  descriptors
- add macb_ptp to compilation chain
Signed-off-by: default avatarRafal Ozieblo <rafalo@cadence.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b83f1527
...@@ -3,5 +3,9 @@ ...@@ -3,5 +3,9 @@
# #
macb-y := macb_main.o macb-y := macb_main.o
ifeq ($(CONFIG_MACB_USE_HWSTAMP),y)
macb-y += macb_ptp.o
endif
obj-$(CONFIG_MACB) += macb.o obj-$(CONFIG_MACB) += macb.o
obj-$(CONFIG_MACB_PCI) += macb_pci.o obj-$(CONFIG_MACB_PCI) += macb_pci.o
...@@ -11,6 +11,8 @@ ...@@ -11,6 +11,8 @@
#define _MACB_H #define _MACB_H
#include <linux/phy.h> #include <linux/phy.h>
#include <linux/ptp_clock_kernel.h>
#include <linux/net_tstamp.h>
#if defined(CONFIG_ARCH_DMA_ADDR_T_64BIT) || defined(CONFIG_MACB_USE_HWSTAMP) #if defined(CONFIG_ARCH_DMA_ADDR_T_64BIT) || defined(CONFIG_MACB_USE_HWSTAMP)
#define MACB_EXT_DESC #define MACB_EXT_DESC
...@@ -90,6 +92,10 @@ ...@@ -90,6 +92,10 @@
#define GEM_SA3T 0x009C /* Specific3 Top */ #define GEM_SA3T 0x009C /* Specific3 Top */
#define GEM_SA4B 0x00A0 /* Specific4 Bottom */ #define GEM_SA4B 0x00A0 /* Specific4 Bottom */
#define GEM_SA4T 0x00A4 /* Specific4 Top */ #define GEM_SA4T 0x00A4 /* Specific4 Top */
#define GEM_EFTSH 0x00e8 /* PTP Event Frame Transmitted Seconds Register 47:32 */
#define GEM_EFRSH 0x00ec /* PTP Event Frame Received Seconds Register 47:32 */
#define GEM_PEFTSH 0x00f0 /* PTP Peer Event Frame Transmitted Seconds Register 47:32 */
#define GEM_PEFRSH 0x00f4 /* PTP Peer Event Frame Received Seconds Register 47:32 */
#define GEM_OTX 0x0100 /* Octets transmitted */ #define GEM_OTX 0x0100 /* Octets transmitted */
#define GEM_OCTTXL 0x0100 /* Octets transmitted [31:0] */ #define GEM_OCTTXL 0x0100 /* Octets transmitted [31:0] */
#define GEM_OCTTXH 0x0104 /* Octets transmitted [47:32] */ #define GEM_OCTTXH 0x0104 /* Octets transmitted [47:32] */
...@@ -159,6 +165,9 @@ ...@@ -159,6 +165,9 @@
#define GEM_DCFG6 0x0294 /* Design Config 6 */ #define GEM_DCFG6 0x0294 /* Design Config 6 */
#define GEM_DCFG7 0x0298 /* Design Config 7 */ #define GEM_DCFG7 0x0298 /* Design Config 7 */
#define GEM_TXBDCTRL 0x04cc /* TX Buffer Descriptor control register */
#define GEM_RXBDCTRL 0x04d0 /* RX Buffer Descriptor control register */
#define GEM_ISR(hw_q) (0x0400 + ((hw_q) << 2)) #define GEM_ISR(hw_q) (0x0400 + ((hw_q) << 2))
#define GEM_TBQP(hw_q) (0x0440 + ((hw_q) << 2)) #define GEM_TBQP(hw_q) (0x0440 + ((hw_q) << 2))
#define GEM_TBQPH(hw_q) (0x04C8) #define GEM_TBQPH(hw_q) (0x04C8)
...@@ -195,6 +204,8 @@ ...@@ -195,6 +204,8 @@
#define MACB_TZQ_OFFSET 12 /* Transmit zero quantum pause frame */ #define MACB_TZQ_OFFSET 12 /* Transmit zero quantum pause frame */
#define MACB_TZQ_SIZE 1 #define MACB_TZQ_SIZE 1
#define MACB_SRTSM_OFFSET 15 #define MACB_SRTSM_OFFSET 15
#define MACB_OSSMODE_OFFSET 24 /* Enable One Step Synchro Mode */
#define MACB_OSSMODE_SIZE 1
/* Bitfields in NCFGR */ /* Bitfields in NCFGR */
#define MACB_SPD_OFFSET 0 /* Speed */ #define MACB_SPD_OFFSET 0 /* Speed */
...@@ -452,6 +463,52 @@ ...@@ -452,6 +463,52 @@
#define GEM_NSINCR_OFFSET 0 #define GEM_NSINCR_OFFSET 0
#define GEM_NSINCR_SIZE 8 #define GEM_NSINCR_SIZE 8
/* Bitfields in TSH */
#define GEM_TSH_OFFSET 0 /* TSU timer value (s). MSB [47:32] of seconds timer count */
#define GEM_TSH_SIZE 16
/* Bitfields in TSL */
#define GEM_TSL_OFFSET 0 /* TSU timer value (s). LSB [31:0] of seconds timer count */
#define GEM_TSL_SIZE 32
/* Bitfields in TN */
#define GEM_TN_OFFSET 0 /* TSU timer value (ns) */
#define GEM_TN_SIZE 30
/* Bitfields in TXBDCTRL */
#define GEM_TXTSMODE_OFFSET 4 /* TX Descriptor Timestamp Insertion mode */
#define GEM_TXTSMODE_SIZE 2
/* Bitfields in RXBDCTRL */
#define GEM_RXTSMODE_OFFSET 4 /* RX Descriptor Timestamp Insertion mode */
#define GEM_RXTSMODE_SIZE 2
/* Transmit DMA buffer descriptor Word 1 */
#define GEM_DMA_TXVALID_OFFSET 23 /* timestamp has been captured in the Buffer Descriptor */
#define GEM_DMA_TXVALID_SIZE 1
/* Receive DMA buffer descriptor Word 0 */
#define GEM_DMA_RXVALID_OFFSET 2 /* indicates a valid timestamp in the Buffer Descriptor */
#define GEM_DMA_RXVALID_SIZE 1
/* DMA buffer descriptor Word 2 (32 bit addressing) or Word 4 (64 bit addressing) */
#define GEM_DMA_SECL_OFFSET 30 /* Timestamp seconds[1:0] */
#define GEM_DMA_SECL_SIZE 2
#define GEM_DMA_NSEC_OFFSET 0 /* Timestamp nanosecs [29:0] */
#define GEM_DMA_NSEC_SIZE 30
/* DMA buffer descriptor Word 3 (32 bit addressing) or Word 5 (64 bit addressing) */
/* New hardware supports 12 bit precision of timestamp in DMA buffer descriptor.
* Old hardware supports only 6 bit precision but it is enough for PTP.
* Less accuracy is used always instead of checking hardware version.
*/
#define GEM_DMA_SECH_OFFSET 0 /* Timestamp seconds[5:2] */
#define GEM_DMA_SECH_SIZE 4
#define GEM_DMA_SEC_WIDTH (GEM_DMA_SECH_SIZE + GEM_DMA_SECL_SIZE)
#define GEM_DMA_SEC_TOP (1 << GEM_DMA_SEC_WIDTH)
#define GEM_DMA_SEC_MASK (GEM_DMA_SEC_TOP - 1)
/* Bitfields in ADJ */ /* Bitfields in ADJ */
#define GEM_ADDSUB_OFFSET 31 #define GEM_ADDSUB_OFFSET 31
#define GEM_ADDSUB_SIZE 1 #define GEM_ADDSUB_SIZE 1
...@@ -527,6 +584,8 @@ ...@@ -527,6 +584,8 @@
#define queue_readl(queue, reg) (queue)->bp->macb_reg_readl((queue)->bp, (queue)->reg) #define queue_readl(queue, reg) (queue)->bp->macb_reg_readl((queue)->bp, (queue)->reg)
#define queue_writel(queue, reg, value) (queue)->bp->macb_reg_writel((queue)->bp, (queue)->reg, (value)) #define queue_writel(queue, reg, value) (queue)->bp->macb_reg_writel((queue)->bp, (queue)->reg, (value))
#define PTP_TS_BUFFER_SIZE 128 /* must be power of 2 */
/* Conditional GEM/MACB macros. These perform the operation to the correct /* Conditional GEM/MACB macros. These perform the operation to the correct
* register dependent on whether the device is a GEM or a MACB. For registers * register dependent on whether the device is a GEM or a MACB. For registers
* and bitfields that are common across both devices, use macb_{read,write}l * and bitfields that are common across both devices, use macb_{read,write}l
...@@ -574,6 +633,11 @@ struct macb_dma_desc_ptp { ...@@ -574,6 +633,11 @@ struct macb_dma_desc_ptp {
u32 ts_1; u32 ts_1;
u32 ts_2; u32 ts_2;
}; };
struct gem_tx_ts {
struct sk_buff *skb;
struct macb_dma_desc_ptp desc_ptp;
};
#endif #endif
/* DMA descriptor bitfields */ /* DMA descriptor bitfields */
...@@ -889,6 +953,11 @@ struct macb_config { ...@@ -889,6 +953,11 @@ struct macb_config {
int jumbo_max_len; int jumbo_max_len;
}; };
struct tsu_incr {
u32 sub_ns;
u32 ns;
};
struct macb_queue { struct macb_queue {
struct macb *bp; struct macb *bp;
int irq; int irq;
...@@ -905,6 +974,12 @@ struct macb_queue { ...@@ -905,6 +974,12 @@ struct macb_queue {
struct macb_tx_skb *tx_skb; struct macb_tx_skb *tx_skb;
dma_addr_t tx_ring_dma; dma_addr_t tx_ring_dma;
struct work_struct tx_error_task; struct work_struct tx_error_task;
#ifdef CONFIG_MACB_USE_HWSTAMP
struct work_struct tx_ts_task;
unsigned int tx_ts_head, tx_ts_tail;
struct gem_tx_ts tx_timestamps[PTP_TS_BUFFER_SIZE];
#endif
}; };
struct macb { struct macb {
...@@ -976,8 +1051,59 @@ struct macb { ...@@ -976,8 +1051,59 @@ struct macb {
#ifdef MACB_EXT_DESC #ifdef MACB_EXT_DESC
uint8_t hw_dma_cap; uint8_t hw_dma_cap;
#endif #endif
spinlock_t tsu_clk_lock; /* gem tsu clock locking */
unsigned int tsu_rate;
struct ptp_clock *ptp_clock;
struct ptp_clock_info ptp_clock_info;
struct tsu_incr tsu_incr;
struct hwtstamp_config tstamp_config;
};
#ifdef CONFIG_MACB_USE_HWSTAMP
#define GEM_TSEC_SIZE (GEM_TSH_SIZE + GEM_TSL_SIZE)
#define TSU_SEC_MAX_VAL (((u64)1 << GEM_TSEC_SIZE) - 1)
#define TSU_NSEC_MAX_VAL ((1 << GEM_TN_SIZE) - 1)
enum macb_bd_control {
TSTAMP_DISABLED,
TSTAMP_FRAME_PTP_EVENT_ONLY,
TSTAMP_ALL_PTP_FRAMES,
TSTAMP_ALL_FRAMES,
}; };
void gem_ptp_init(struct net_device *ndev);
void gem_ptp_remove(struct net_device *ndev);
int gem_ptp_txstamp(struct macb_queue *queue, struct sk_buff *skb, struct macb_dma_desc *des);
void gem_ptp_rxstamp(struct macb *bp, struct sk_buff *skb, struct macb_dma_desc *desc);
static inline int gem_ptp_do_txstamp(struct macb_queue *queue, struct sk_buff *skb, struct macb_dma_desc *desc)
{
if (queue->bp->tstamp_config.tx_type == TSTAMP_DISABLED)
return -ENOTSUPP;
return gem_ptp_txstamp(queue, skb, desc);
}
static inline void gem_ptp_do_rxstamp(struct macb *bp, struct sk_buff *skb, struct macb_dma_desc *desc)
{
if (bp->tstamp_config.rx_filter == TSTAMP_DISABLED)
return;
gem_ptp_rxstamp(bp, skb, desc);
}
int gem_get_hwtst(struct net_device *dev, struct ifreq *rq);
int gem_set_hwtst(struct net_device *dev, struct ifreq *ifr, int cmd);
#else
static inline void gem_ptp_init(struct net_device *ndev) { }
static inline void gem_ptp_remove(struct net_device *ndev) { }
static inline int gem_ptp_do_txstamp(struct macb_queue *queue, struct sk_buff *skb, struct macb_dma_desc *desc)
{
return -1;
}
static inline void gem_ptp_do_rxstamp(struct macb *bp, struct sk_buff *skb, struct macb_dma_desc *desc) { }
#endif
static inline bool macb_is_gem(struct macb *bp) static inline bool macb_is_gem(struct macb *bp)
{ {
return !!(bp->caps & MACB_CAPS_MACB_IS_GEM); return !!(bp->caps & MACB_CAPS_MACB_IS_GEM);
......
...@@ -847,6 +847,12 @@ static void macb_tx_interrupt(struct macb_queue *queue) ...@@ -847,6 +847,12 @@ static void macb_tx_interrupt(struct macb_queue *queue)
/* First, update TX stats if needed */ /* First, update TX stats if needed */
if (skb) { if (skb) {
if (gem_ptp_do_txstamp(queue, skb, desc) == 0) {
/* skb now belongs to timestamp buffer
* and will be removed later
*/
tx_skb->skb = NULL;
}
netdev_vdbg(bp->dev, "skb %u (data %p) TX complete\n", netdev_vdbg(bp->dev, "skb %u (data %p) TX complete\n",
macb_tx_ring_wrap(bp, tail), macb_tx_ring_wrap(bp, tail),
skb->data); skb->data);
...@@ -1013,6 +1019,8 @@ static int gem_rx(struct macb *bp, int budget) ...@@ -1013,6 +1019,8 @@ static int gem_rx(struct macb *bp, int budget)
bp->dev->stats.rx_packets++; bp->dev->stats.rx_packets++;
bp->dev->stats.rx_bytes += skb->len; bp->dev->stats.rx_bytes += skb->len;
gem_ptp_do_rxstamp(bp, skb, desc);
#if defined(DEBUG) && defined(VERBOSE_DEBUG) #if defined(DEBUG) && defined(VERBOSE_DEBUG)
netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n", netdev_vdbg(bp->dev, "received skb of length %u, csum: %08x\n",
skb->len, skb->csum); skb->len, skb->csum);
...@@ -1334,7 +1342,6 @@ static irqreturn_t macb_interrupt(int irq, void *dev_id) ...@@ -1334,7 +1342,6 @@ static irqreturn_t macb_interrupt(int irq, void *dev_id)
if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE) if (bp->caps & MACB_CAPS_ISR_CLEAR_ON_WRITE)
queue_writel(queue, ISR, MACB_BIT(HRESP)); queue_writel(queue, ISR, MACB_BIT(HRESP));
} }
status = queue_readl(queue, ISR); status = queue_readl(queue, ISR);
} }
...@@ -1664,7 +1671,6 @@ static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev) ...@@ -1664,7 +1671,6 @@ static int macb_start_xmit(struct sk_buff *skb, struct net_device *dev)
/* Make newly initialized descriptor visible to hardware */ /* Make newly initialized descriptor visible to hardware */
wmb(); wmb();
skb_tx_timestamp(skb); skb_tx_timestamp(skb);
macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART)); macb_writel(bp, NCR, macb_readl(bp, NCR) | MACB_BIT(TSTART));
...@@ -2522,6 +2528,70 @@ static int macb_set_ringparam(struct net_device *netdev, ...@@ -2522,6 +2528,70 @@ static int macb_set_ringparam(struct net_device *netdev,
return 0; return 0;
} }
#ifdef CONFIG_MACB_USE_HWSTAMP
static unsigned int gem_get_tsu_rate(struct macb *bp)
{
struct clk *tsu_clk;
unsigned int tsu_rate;
tsu_clk = devm_clk_get(&bp->pdev->dev, "tsu_clk");
if (!IS_ERR(tsu_clk))
tsu_rate = clk_get_rate(tsu_clk);
/* try pclk instead */
else if (!IS_ERR(bp->pclk)) {
tsu_clk = bp->pclk;
tsu_rate = clk_get_rate(tsu_clk);
} else
return -ENOTSUPP;
return tsu_rate;
}
static s32 gem_get_ptp_max_adj(void)
{
return 64000000;
}
static int gem_get_ts_info(struct net_device *dev,
struct ethtool_ts_info *info)
{
struct macb *bp = netdev_priv(dev);
if ((bp->hw_dma_cap & HW_DMA_CAP_PTP) == 0) {
ethtool_op_get_ts_info(dev, info);
return 0;
}
info->so_timestamping =
SOF_TIMESTAMPING_TX_SOFTWARE |
SOF_TIMESTAMPING_RX_SOFTWARE |
SOF_TIMESTAMPING_SOFTWARE |
SOF_TIMESTAMPING_TX_HARDWARE |
SOF_TIMESTAMPING_RX_HARDWARE |
SOF_TIMESTAMPING_RAW_HARDWARE;
info->tx_types =
(1 << HWTSTAMP_TX_ONESTEP_SYNC) |
(1 << HWTSTAMP_TX_OFF) |
(1 << HWTSTAMP_TX_ON);
info->rx_filters =
(1 << HWTSTAMP_FILTER_NONE) |
(1 << HWTSTAMP_FILTER_ALL);
info->phc_index = bp->ptp_clock ? ptp_clock_index(bp->ptp_clock) : -1;
return 0;
}
static struct macb_ptp_info gem_ptp_info = {
.ptp_init = gem_ptp_init,
.ptp_remove = gem_ptp_remove,
.get_ptp_max_adj = gem_get_ptp_max_adj,
.get_tsu_rate = gem_get_tsu_rate,
.get_ts_info = gem_get_ts_info,
.get_hwtst = gem_get_hwtst,
.set_hwtst = gem_set_hwtst,
};
#endif
static int macb_get_ts_info(struct net_device *netdev, static int macb_get_ts_info(struct net_device *netdev,
struct ethtool_ts_info *info) struct ethtool_ts_info *info)
{ {
...@@ -2655,13 +2725,17 @@ static void macb_configure_caps(struct macb *bp, ...@@ -2655,13 +2725,17 @@ static void macb_configure_caps(struct macb *bp,
dcfg = gem_readl(bp, DCFG2); dcfg = gem_readl(bp, DCFG2);
if ((dcfg & (GEM_BIT(RX_PKT_BUFF) | GEM_BIT(TX_PKT_BUFF))) == 0) if ((dcfg & (GEM_BIT(RX_PKT_BUFF) | GEM_BIT(TX_PKT_BUFF))) == 0)
bp->caps |= MACB_CAPS_FIFO_MODE; bp->caps |= MACB_CAPS_FIFO_MODE;
if (IS_ENABLED(CONFIG_MACB_USE_HWSTAMP) && gem_has_ptp(bp)) { #ifdef CONFIG_MACB_USE_HWSTAMP
if (gem_has_ptp(bp)) {
if (!GEM_BFEXT(TSU, gem_readl(bp, DCFG5))) if (!GEM_BFEXT(TSU, gem_readl(bp, DCFG5)))
pr_err("GEM doesn't support hardware ptp.\n"); pr_err("GEM doesn't support hardware ptp.\n");
else else {
bp->hw_dma_cap |= HW_DMA_CAP_PTP; bp->hw_dma_cap |= HW_DMA_CAP_PTP;
bp->ptp_info = &gem_ptp_info;
} }
} }
#endif
}
dev_dbg(&bp->pdev->dev, "Cadence caps 0x%08x\n", bp->caps); dev_dbg(&bp->pdev->dev, "Cadence caps 0x%08x\n", bp->caps);
} }
...@@ -3266,7 +3340,9 @@ static const struct macb_config np4_config = { ...@@ -3266,7 +3340,9 @@ static const struct macb_config np4_config = {
}; };
static const struct macb_config zynqmp_config = { static const struct macb_config zynqmp_config = {
.caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_JUMBO, .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE |
MACB_CAPS_JUMBO |
MACB_CAPS_GEM_HAS_PTP,
.dma_burst_length = 16, .dma_burst_length = 16,
.clk_init = macb_clk_init, .clk_init = macb_clk_init,
.init = macb_init, .init = macb_init,
...@@ -3300,7 +3376,9 @@ MODULE_DEVICE_TABLE(of, macb_dt_ids); ...@@ -3300,7 +3376,9 @@ MODULE_DEVICE_TABLE(of, macb_dt_ids);
#endif /* CONFIG_OF */ #endif /* CONFIG_OF */
static const struct macb_config default_gem_config = { static const struct macb_config default_gem_config = {
.caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_JUMBO, .caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE |
MACB_CAPS_JUMBO |
MACB_CAPS_GEM_HAS_PTP,
.dma_burst_length = 16, .dma_burst_length = 16,
.clk_init = macb_clk_init, .clk_init = macb_clk_init,
.init = macb_init, .init = macb_init,
......
/**
* 1588 PTP support for Cadence GEM device.
*
* Copyright (C) 2017 Cadence Design Systems - http://www.cadence.com
*
* Authors: Rafal Ozieblo <rafalo@cadence.com>
* Bartosz Folta <bfolta@cadence.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 of
* the License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/clk.h>
#include <linux/device.h>
#include <linux/etherdevice.h>
#include <linux/platform_device.h>
#include <linux/time64.h>
#include <linux/ptp_classify.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/net_tstamp.h>
#include <linux/circ_buf.h>
#include <linux/spinlock.h>
#include "macb.h"
#define GEM_PTP_TIMER_NAME "gem-ptp-timer"
static struct macb_dma_desc_ptp *macb_ptp_desc(struct macb *bp,
struct macb_dma_desc *desc)
{
if (bp->hw_dma_cap == HW_DMA_CAP_PTP)
return (struct macb_dma_desc_ptp *)
((u8 *)desc + sizeof(struct macb_dma_desc));
if (bp->hw_dma_cap == HW_DMA_CAP_64B_PTP)
return (struct macb_dma_desc_ptp *)
((u8 *)desc + sizeof(struct macb_dma_desc)
+ sizeof(struct macb_dma_desc_64));
return NULL;
}
static int gem_tsu_get_time(struct ptp_clock_info *ptp, struct timespec64 *ts)
{
struct macb *bp = container_of(ptp, struct macb, ptp_clock_info);
unsigned long flags;
long first, second;
u32 secl, sech;
spin_lock_irqsave(&bp->tsu_clk_lock, flags);
first = gem_readl(bp, TN);
secl = gem_readl(bp, TSL);
sech = gem_readl(bp, TSH);
second = gem_readl(bp, TN);
/* test for nsec rollover */
if (first > second) {
/* if so, use later read & re-read seconds
* (assume all done within 1s)
*/
ts->tv_nsec = gem_readl(bp, TN);
secl = gem_readl(bp, TSL);
sech = gem_readl(bp, TSH);
} else {
ts->tv_nsec = first;
}
spin_unlock_irqrestore(&bp->tsu_clk_lock, flags);
ts->tv_sec = (((u64)sech << GEM_TSL_SIZE) | secl)
& TSU_SEC_MAX_VAL;
return 0;
}
static int gem_tsu_set_time(struct ptp_clock_info *ptp,
const struct timespec64 *ts)
{
struct macb *bp = container_of(ptp, struct macb, ptp_clock_info);
unsigned long flags;
u32 ns, sech, secl;
secl = (u32)ts->tv_sec;
sech = (ts->tv_sec >> GEM_TSL_SIZE) & ((1 << GEM_TSH_SIZE) - 1);
ns = ts->tv_nsec;
spin_lock_irqsave(&bp->tsu_clk_lock, flags);
/* TSH doesn't latch the time and no atomicity! */
gem_writel(bp, TN, 0); /* clear to avoid overflow */
gem_writel(bp, TSH, sech);
/* write lower bits 2nd, for synchronized secs update */
gem_writel(bp, TSL, secl);
gem_writel(bp, TN, ns);
spin_unlock_irqrestore(&bp->tsu_clk_lock, flags);
return 0;
}
static int gem_tsu_incr_set(struct macb *bp, struct tsu_incr *incr_spec)
{
unsigned long flags;
/* tsu_timer_incr register must be written after
* the tsu_timer_incr_sub_ns register and the write operation
* will cause the value written to the tsu_timer_incr_sub_ns register
* to take effect.
*/
spin_lock_irqsave(&bp->tsu_clk_lock, flags);
gem_writel(bp, TISUBN, GEM_BF(SUBNSINCR, incr_spec->sub_ns));
gem_writel(bp, TI, GEM_BF(NSINCR, incr_spec->ns));
spin_unlock_irqrestore(&bp->tsu_clk_lock, flags);
return 0;
}
static int gem_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm)
{
struct macb *bp = container_of(ptp, struct macb, ptp_clock_info);
struct tsu_incr incr_spec;
bool neg_adj = false;
u32 word;
u64 adj;
if (scaled_ppm < 0) {
neg_adj = true;
scaled_ppm = -scaled_ppm;
}
/* Adjustment is relative to base frequency */
incr_spec.sub_ns = bp->tsu_incr.sub_ns;
incr_spec.ns = bp->tsu_incr.ns;
/* scaling: unused(8bit) | ns(8bit) | fractions(16bit) */
word = ((u64)incr_spec.ns << GEM_SUBNSINCR_SIZE) + incr_spec.sub_ns;
adj = (u64)scaled_ppm * word;
/* Divide with rounding, equivalent to floating dividing:
* (temp / USEC_PER_SEC) + 0.5
*/
adj += (USEC_PER_SEC >> 1);
adj >>= GEM_SUBNSINCR_SIZE; /* remove fractions */
adj = div_u64(adj, USEC_PER_SEC);
adj = neg_adj ? (word - adj) : (word + adj);
incr_spec.ns = (adj >> GEM_SUBNSINCR_SIZE)
& ((1 << GEM_NSINCR_SIZE) - 1);
incr_spec.sub_ns = adj & ((1 << GEM_SUBNSINCR_SIZE) - 1);
gem_tsu_incr_set(bp, &incr_spec);
return 0;
}
static int gem_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
{
struct macb *bp = container_of(ptp, struct macb, ptp_clock_info);
struct timespec64 now, then = ns_to_timespec64(delta);
u32 adj, sign = 0;
if (delta < 0) {
sign = 1;
delta = -delta;
}
if (delta > TSU_NSEC_MAX_VAL) {
gem_tsu_get_time(&bp->ptp_clock_info, &now);
if (sign)
now = timespec64_sub(now, then);
else
now = timespec64_add(now, then);
gem_tsu_set_time(&bp->ptp_clock_info,
(const struct timespec64 *)&now);
} else {
adj = (sign << GEM_ADDSUB_OFFSET) | delta;
gem_writel(bp, TA, adj);
}
return 0;
}
static int gem_ptp_enable(struct ptp_clock_info *ptp,
struct ptp_clock_request *rq, int on)
{
return -EOPNOTSUPP;
}
static struct ptp_clock_info gem_ptp_caps_template = {
.owner = THIS_MODULE,
.name = GEM_PTP_TIMER_NAME,
.max_adj = 0,
.n_alarm = 0,
.n_ext_ts = 0,
.n_per_out = 0,
.n_pins = 0,
.pps = 1,
.adjfine = gem_ptp_adjfine,
.adjtime = gem_ptp_adjtime,
.gettime64 = gem_tsu_get_time,
.settime64 = gem_tsu_set_time,
.enable = gem_ptp_enable,
};
static void gem_ptp_init_timer(struct macb *bp)
{
u32 rem = 0;
u64 adj;
bp->tsu_incr.ns = div_u64_rem(NSEC_PER_SEC, bp->tsu_rate, &rem);
if (rem) {
adj = rem;
adj <<= GEM_SUBNSINCR_SIZE;
bp->tsu_incr.sub_ns = div_u64(adj, bp->tsu_rate);
} else {
bp->tsu_incr.sub_ns = 0;
}
}
static void gem_ptp_init_tsu(struct macb *bp)
{
struct timespec64 ts;
/* 1. get current system time */
ts = ns_to_timespec64(ktime_to_ns(ktime_get_real()));
/* 2. set ptp timer */
gem_tsu_set_time(&bp->ptp_clock_info, &ts);
/* 3. set PTP timer increment value to BASE_INCREMENT */
gem_tsu_incr_set(bp, &bp->tsu_incr);
gem_writel(bp, TA, 0);
}
static void gem_ptp_clear_timer(struct macb *bp)
{
bp->tsu_incr.sub_ns = 0;
bp->tsu_incr.ns = 0;
gem_writel(bp, TISUBN, GEM_BF(SUBNSINCR, 0));
gem_writel(bp, TI, GEM_BF(NSINCR, 0));
gem_writel(bp, TA, 0);
}
static int gem_hw_timestamp(struct macb *bp, u32 dma_desc_ts_1,
u32 dma_desc_ts_2, struct timespec64 *ts)
{
struct timespec64 tsu;
ts->tv_sec = (GEM_BFEXT(DMA_SECH, dma_desc_ts_2) << GEM_DMA_SECL_SIZE) |
GEM_BFEXT(DMA_SECL, dma_desc_ts_1);
ts->tv_nsec = GEM_BFEXT(DMA_NSEC, dma_desc_ts_1);
/* TSU overlapping workaround
* The timestamp only contains lower few bits of seconds,
* so add value from 1588 timer
*/
gem_tsu_get_time(&bp->ptp_clock_info, &tsu);
/* If the top bit is set in the timestamp,
* but not in 1588 timer, it has rolled over,
* so subtract max size
*/
if ((ts->tv_sec & (GEM_DMA_SEC_TOP >> 1)) &&
!(tsu.tv_sec & (GEM_DMA_SEC_TOP >> 1)))
ts->tv_sec -= GEM_DMA_SEC_TOP;
ts->tv_sec += ((~GEM_DMA_SEC_MASK) & tsu.tv_sec);
return 0;
}
void gem_ptp_rxstamp(struct macb *bp, struct sk_buff *skb,
struct macb_dma_desc *desc)
{
struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
struct macb_dma_desc_ptp *desc_ptp;
struct timespec64 ts;
if (GEM_BFEXT(DMA_RXVALID, desc->addr)) {
desc_ptp = macb_ptp_desc(bp, desc);
gem_hw_timestamp(bp, desc_ptp->ts_1, desc_ptp->ts_2, &ts);
memset(shhwtstamps, 0, sizeof(struct skb_shared_hwtstamps));
shhwtstamps->hwtstamp = ktime_set(ts.tv_sec, ts.tv_nsec);
}
}
static void gem_tstamp_tx(struct macb *bp, struct sk_buff *skb,
struct macb_dma_desc_ptp *desc_ptp)
{
struct skb_shared_hwtstamps shhwtstamps;
struct timespec64 ts;
gem_hw_timestamp(bp, desc_ptp->ts_1, desc_ptp->ts_2, &ts);
memset(&shhwtstamps, 0, sizeof(shhwtstamps));
shhwtstamps.hwtstamp = ktime_set(ts.tv_sec, ts.tv_nsec);
skb_tstamp_tx(skb, &shhwtstamps);
}
int gem_ptp_txstamp(struct macb_queue *queue, struct sk_buff *skb,
struct macb_dma_desc *desc)
{
unsigned long tail = READ_ONCE(queue->tx_ts_tail);
unsigned long head = queue->tx_ts_head;
struct macb_dma_desc_ptp *desc_ptp;
struct gem_tx_ts *tx_timestamp;
if (!GEM_BFEXT(DMA_TXVALID, desc->ctrl))
return -EINVAL;
if (CIRC_SPACE(head, tail, PTP_TS_BUFFER_SIZE) == 0)
return -ENOMEM;
skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
desc_ptp = macb_ptp_desc(queue->bp, desc);
tx_timestamp = &queue->tx_timestamps[head];
tx_timestamp->skb = skb;
tx_timestamp->desc_ptp.ts_1 = desc_ptp->ts_1;
tx_timestamp->desc_ptp.ts_2 = desc_ptp->ts_2;
/* move head */
smp_store_release(&queue->tx_ts_head,
(head + 1) & (PTP_TS_BUFFER_SIZE - 1));
schedule_work(&queue->tx_ts_task);
return 0;
}
static void gem_tx_timestamp_flush(struct work_struct *work)
{
struct macb_queue *queue =
container_of(work, struct macb_queue, tx_ts_task);
unsigned long head, tail;
struct gem_tx_ts *tx_ts;
/* take current head */
head = smp_load_acquire(&queue->tx_ts_head);
tail = queue->tx_ts_tail;
while (CIRC_CNT(head, tail, PTP_TS_BUFFER_SIZE)) {
tx_ts = &queue->tx_timestamps[tail];
gem_tstamp_tx(queue->bp, tx_ts->skb, &tx_ts->desc_ptp);
/* cleanup */
dev_kfree_skb_any(tx_ts->skb);
/* remove old tail */
smp_store_release(&queue->tx_ts_tail,
(tail + 1) & (PTP_TS_BUFFER_SIZE - 1));
tail = queue->tx_ts_tail;
}
}
void gem_ptp_init(struct net_device *dev)
{
struct macb *bp = netdev_priv(dev);
struct macb_queue *queue;
unsigned int q;
bp->ptp_clock_info = gem_ptp_caps_template;
/* nominal frequency and maximum adjustment in ppb */
bp->tsu_rate = bp->ptp_info->get_tsu_rate(bp);
bp->ptp_clock_info.max_adj = bp->ptp_info->get_ptp_max_adj();
gem_ptp_init_timer(bp);
bp->ptp_clock = ptp_clock_register(&bp->ptp_clock_info, &dev->dev);
if (IS_ERR(bp->ptp_clock)) {
pr_err("ptp clock register failed: %ld\n",
PTR_ERR(bp->ptp_clock));
bp->ptp_clock = NULL;
return;
} else if (bp->ptp_clock == NULL) {
pr_err("ptp clock register failed\n");
return;
}
spin_lock_init(&bp->tsu_clk_lock);
for (q = 0, queue = bp->queues; q < bp->num_queues; ++q, ++queue) {
queue->tx_ts_head = 0;
queue->tx_ts_tail = 0;
INIT_WORK(&queue->tx_ts_task, gem_tx_timestamp_flush);
}
gem_ptp_init_tsu(bp);
dev_info(&bp->pdev->dev, "%s ptp clock registered.\n",
GEM_PTP_TIMER_NAME);
}
void gem_ptp_remove(struct net_device *ndev)
{
struct macb *bp = netdev_priv(ndev);
if (bp->ptp_clock)
ptp_clock_unregister(bp->ptp_clock);
gem_ptp_clear_timer(bp);
dev_info(&bp->pdev->dev, "%s ptp clock unregistered.\n",
GEM_PTP_TIMER_NAME);
}
static int gem_ptp_set_ts_mode(struct macb *bp,
enum macb_bd_control tx_bd_control,
enum macb_bd_control rx_bd_control)
{
gem_writel(bp, TXBDCTRL, GEM_BF(TXTSMODE, tx_bd_control));
gem_writel(bp, RXBDCTRL, GEM_BF(RXTSMODE, rx_bd_control));
return 0;
}
int gem_get_hwtst(struct net_device *dev, struct ifreq *rq)
{
struct hwtstamp_config *tstamp_config;
struct macb *bp = netdev_priv(dev);
tstamp_config = &bp->tstamp_config;
if ((bp->hw_dma_cap & HW_DMA_CAP_PTP) == 0)
return -EOPNOTSUPP;
if (copy_to_user(rq->ifr_data, tstamp_config, sizeof(*tstamp_config)))
return -EFAULT;
else
return 0;
}
static int gem_ptp_set_one_step_sync(struct macb *bp, u8 enable)
{
u32 reg_val;
reg_val = macb_readl(bp, NCR);
if (enable)
macb_writel(bp, NCR, reg_val | MACB_BIT(OSSMODE));
else
macb_writel(bp, NCR, reg_val & ~MACB_BIT(OSSMODE));
return 0;
}
int gem_set_hwtst(struct net_device *dev, struct ifreq *ifr, int cmd)
{
enum macb_bd_control tx_bd_control = TSTAMP_DISABLED;
enum macb_bd_control rx_bd_control = TSTAMP_DISABLED;
struct hwtstamp_config *tstamp_config;
struct macb *bp = netdev_priv(dev);
u32 regval;
tstamp_config = &bp->tstamp_config;
if ((bp->hw_dma_cap & HW_DMA_CAP_PTP) == 0)
return -EOPNOTSUPP;
if (copy_from_user(tstamp_config, ifr->ifr_data,
sizeof(*tstamp_config)))
return -EFAULT;
/* reserved for future extensions */
if (tstamp_config->flags)
return -EINVAL;
switch (tstamp_config->tx_type) {
case HWTSTAMP_TX_OFF:
break;
case HWTSTAMP_TX_ONESTEP_SYNC:
if (gem_ptp_set_one_step_sync(bp, 1) != 0)
return -ERANGE;
case HWTSTAMP_TX_ON:
tx_bd_control = TSTAMP_ALL_FRAMES;
break;
default:
return -ERANGE;
}
switch (tstamp_config->rx_filter) {
case HWTSTAMP_FILTER_NONE:
break;
case HWTSTAMP_FILTER_PTP_V1_L4_SYNC:
break;
case HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ:
break;
case HWTSTAMP_FILTER_PTP_V2_EVENT:
case HWTSTAMP_FILTER_PTP_V2_L2_EVENT:
case HWTSTAMP_FILTER_PTP_V2_L4_EVENT:
case HWTSTAMP_FILTER_PTP_V2_SYNC:
case HWTSTAMP_FILTER_PTP_V2_L2_SYNC:
case HWTSTAMP_FILTER_PTP_V2_L4_SYNC:
case HWTSTAMP_FILTER_PTP_V2_DELAY_REQ:
case HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ:
case HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ:
rx_bd_control = TSTAMP_ALL_PTP_FRAMES;
tstamp_config->rx_filter = HWTSTAMP_FILTER_PTP_V2_EVENT;
regval = macb_readl(bp, NCR);
macb_writel(bp, NCR, (regval | MACB_BIT(SRTSM)));
break;
case HWTSTAMP_FILTER_PTP_V1_L4_EVENT:
case HWTSTAMP_FILTER_ALL:
rx_bd_control = TSTAMP_ALL_FRAMES;
tstamp_config->rx_filter = HWTSTAMP_FILTER_ALL;
break;
default:
tstamp_config->rx_filter = HWTSTAMP_FILTER_NONE;
return -ERANGE;
}
if (gem_ptp_set_ts_mode(bp, tx_bd_control, rx_bd_control) != 0)
return -ERANGE;
if (copy_to_user(ifr->ifr_data, tstamp_config, sizeof(*tstamp_config)))
return -EFAULT;
else
return 0;
}
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