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linux_dsm_epyc7002/drivers/net/can/ifi_canfd/ifi_canfd.c
Marek Vasut 880dd464b4 can: ifi: Repair the error handling 
The new version of the IFI CANFD core has significantly less complex
error state indication logic. In particular, the warning/error state
bits are no longer all over the place, but are all present in the
STATUS register. Moreover, there is a new IRQ register bit indicating
transition between error states (active/warning/passive/busoff).

This patch makes use of this bit to weed out the obscure selective
INTERRUPT register clearing, which was used to carry over the error
state indication into the poll function. While at it, this patch
fixes the handling of the ACTIVE state, since the hardware provides
indication of the core being in ACTIVE state and that in turn fixes
the state transition indication toward userspace. Finally, register
reads in the poll function are moved to the matching subfunctions
since those are also no longer needed in the poll function.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Heiko Schocher <hs@denx.de>
Cc: Markus Marb <markus@marb.org>
Cc: Marc Kleine-Budde <mkl@pengutronix.de>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
2018-03-12 09:55:12 +01:00

1054 lines
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/*
* CAN bus driver for IFI CANFD controller
*
* Copyright (C) 2016 Marek Vasut <marex@denx.de>
*
* Details about this controller can be found at
* http://www.ifi-pld.de/IP/CANFD/canfd.html
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/can/dev.h>
#define IFI_CANFD_STCMD 0x0
#define IFI_CANFD_STCMD_HARDRESET 0xDEADCAFD
#define IFI_CANFD_STCMD_ENABLE BIT(0)
#define IFI_CANFD_STCMD_ERROR_ACTIVE BIT(2)
#define IFI_CANFD_STCMD_ERROR_PASSIVE BIT(3)
#define IFI_CANFD_STCMD_BUSOFF BIT(4)
#define IFI_CANFD_STCMD_ERROR_WARNING BIT(5)
#define IFI_CANFD_STCMD_BUSMONITOR BIT(16)
#define IFI_CANFD_STCMD_LOOPBACK BIT(18)
#define IFI_CANFD_STCMD_DISABLE_CANFD BIT(24)
#define IFI_CANFD_STCMD_ENABLE_ISO BIT(25)
#define IFI_CANFD_STCMD_ENABLE_7_9_8_8_TIMING BIT(26)
#define IFI_CANFD_STCMD_NORMAL_MODE ((u32)BIT(31))
#define IFI_CANFD_RXSTCMD 0x4
#define IFI_CANFD_RXSTCMD_REMOVE_MSG BIT(0)
#define IFI_CANFD_RXSTCMD_RESET BIT(7)
#define IFI_CANFD_RXSTCMD_EMPTY BIT(8)
#define IFI_CANFD_RXSTCMD_OVERFLOW BIT(13)
#define IFI_CANFD_TXSTCMD 0x8
#define IFI_CANFD_TXSTCMD_ADD_MSG BIT(0)
#define IFI_CANFD_TXSTCMD_HIGH_PRIO BIT(1)
#define IFI_CANFD_TXSTCMD_RESET BIT(7)
#define IFI_CANFD_TXSTCMD_EMPTY BIT(8)
#define IFI_CANFD_TXSTCMD_FULL BIT(12)
#define IFI_CANFD_TXSTCMD_OVERFLOW BIT(13)
#define IFI_CANFD_INTERRUPT 0xc
#define IFI_CANFD_INTERRUPT_ERROR_BUSOFF BIT(0)
#define IFI_CANFD_INTERRUPT_ERROR_WARNING BIT(1)
#define IFI_CANFD_INTERRUPT_ERROR_STATE_CHG BIT(2)
#define IFI_CANFD_INTERRUPT_ERROR_REC_TEC_INC BIT(3)
#define IFI_CANFD_INTERRUPT_ERROR_COUNTER BIT(10)
#define IFI_CANFD_INTERRUPT_TXFIFO_EMPTY BIT(16)
#define IFI_CANFD_INTERRUPT_TXFIFO_REMOVE BIT(22)
#define IFI_CANFD_INTERRUPT_RXFIFO_NEMPTY BIT(24)
#define IFI_CANFD_INTERRUPT_RXFIFO_NEMPTY_PER BIT(25)
#define IFI_CANFD_INTERRUPT_SET_IRQ ((u32)BIT(31))
#define IFI_CANFD_IRQMASK 0x10
#define IFI_CANFD_IRQMASK_ERROR_BUSOFF BIT(0)
#define IFI_CANFD_IRQMASK_ERROR_WARNING BIT(1)
#define IFI_CANFD_IRQMASK_ERROR_STATE_CHG BIT(2)
#define IFI_CANFD_IRQMASK_ERROR_REC_TEC_INC BIT(3)
#define IFI_CANFD_IRQMASK_SET_ERR BIT(7)
#define IFI_CANFD_IRQMASK_SET_TS BIT(15)
#define IFI_CANFD_IRQMASK_TXFIFO_EMPTY BIT(16)
#define IFI_CANFD_IRQMASK_SET_TX BIT(23)
#define IFI_CANFD_IRQMASK_RXFIFO_NEMPTY BIT(24)
#define IFI_CANFD_IRQMASK_SET_RX ((u32)BIT(31))
#define IFI_CANFD_TIME 0x14
#define IFI_CANFD_FTIME 0x18
#define IFI_CANFD_TIME_TIMEB_OFF 0
#define IFI_CANFD_TIME_TIMEA_OFF 8
#define IFI_CANFD_TIME_PRESCALE_OFF 16
#define IFI_CANFD_TIME_SJW_OFF_7_9_8_8 25
#define IFI_CANFD_TIME_SJW_OFF_4_12_6_6 28
#define IFI_CANFD_TIME_SET_SJW_4_12_6_6 BIT(6)
#define IFI_CANFD_TIME_SET_TIMEB_4_12_6_6 BIT(7)
#define IFI_CANFD_TIME_SET_PRESC_4_12_6_6 BIT(14)
#define IFI_CANFD_TIME_SET_TIMEA_4_12_6_6 BIT(15)
#define IFI_CANFD_TDELAY 0x1c
#define IFI_CANFD_TDELAY_DEFAULT 0xb
#define IFI_CANFD_TDELAY_MASK 0x3fff
#define IFI_CANFD_TDELAY_ABS BIT(14)
#define IFI_CANFD_TDELAY_EN BIT(15)
#define IFI_CANFD_ERROR 0x20
#define IFI_CANFD_ERROR_TX_OFFSET 0
#define IFI_CANFD_ERROR_TX_MASK 0xff
#define IFI_CANFD_ERROR_RX_OFFSET 16
#define IFI_CANFD_ERROR_RX_MASK 0xff
#define IFI_CANFD_ERRCNT 0x24
#define IFI_CANFD_SUSPEND 0x28
#define IFI_CANFD_REPEAT 0x2c
#define IFI_CANFD_TRAFFIC 0x30
#define IFI_CANFD_TSCONTROL 0x34
#define IFI_CANFD_TSC 0x38
#define IFI_CANFD_TST 0x3c
#define IFI_CANFD_RES1 0x40
#define IFI_CANFD_ERROR_CTR 0x44
#define IFI_CANFD_ERROR_CTR_UNLOCK_MAGIC 0x21302899
#define IFI_CANFD_ERROR_CTR_OVERLOAD_FIRST BIT(0)
#define IFI_CANFD_ERROR_CTR_ACK_ERROR_FIRST BIT(1)
#define IFI_CANFD_ERROR_CTR_BIT0_ERROR_FIRST BIT(2)
#define IFI_CANFD_ERROR_CTR_BIT1_ERROR_FIRST BIT(3)
#define IFI_CANFD_ERROR_CTR_STUFF_ERROR_FIRST BIT(4)
#define IFI_CANFD_ERROR_CTR_CRC_ERROR_FIRST BIT(5)
#define IFI_CANFD_ERROR_CTR_FORM_ERROR_FIRST BIT(6)
#define IFI_CANFD_ERROR_CTR_OVERLOAD_ALL BIT(8)
#define IFI_CANFD_ERROR_CTR_ACK_ERROR_ALL BIT(9)
#define IFI_CANFD_ERROR_CTR_BIT0_ERROR_ALL BIT(10)
#define IFI_CANFD_ERROR_CTR_BIT1_ERROR_ALL BIT(11)
#define IFI_CANFD_ERROR_CTR_STUFF_ERROR_ALL BIT(12)
#define IFI_CANFD_ERROR_CTR_CRC_ERROR_ALL BIT(13)
#define IFI_CANFD_ERROR_CTR_FORM_ERROR_ALL BIT(14)
#define IFI_CANFD_ERROR_CTR_BITPOSITION_OFFSET 16
#define IFI_CANFD_ERROR_CTR_BITPOSITION_MASK 0xff
#define IFI_CANFD_ERROR_CTR_ER_RESET BIT(30)
#define IFI_CANFD_ERROR_CTR_ER_ENABLE ((u32)BIT(31))
#define IFI_CANFD_PAR 0x48
#define IFI_CANFD_CANCLOCK 0x4c
#define IFI_CANFD_SYSCLOCK 0x50
#define IFI_CANFD_VER 0x54
#define IFI_CANFD_VER_REV_MASK 0xff
#define IFI_CANFD_VER_REV_MIN_SUPPORTED 0x15
#define IFI_CANFD_IP_ID 0x58
#define IFI_CANFD_IP_ID_VALUE 0xD073CAFD
#define IFI_CANFD_TEST 0x5c
#define IFI_CANFD_RXFIFO_TS_63_32 0x60
#define IFI_CANFD_RXFIFO_TS_31_0 0x64
#define IFI_CANFD_RXFIFO_DLC 0x68
#define IFI_CANFD_RXFIFO_DLC_DLC_OFFSET 0
#define IFI_CANFD_RXFIFO_DLC_DLC_MASK 0xf
#define IFI_CANFD_RXFIFO_DLC_RTR BIT(4)
#define IFI_CANFD_RXFIFO_DLC_EDL BIT(5)
#define IFI_CANFD_RXFIFO_DLC_BRS BIT(6)
#define IFI_CANFD_RXFIFO_DLC_ESI BIT(7)
#define IFI_CANFD_RXFIFO_DLC_OBJ_OFFSET 8
#define IFI_CANFD_RXFIFO_DLC_OBJ_MASK 0x1ff
#define IFI_CANFD_RXFIFO_DLC_FNR_OFFSET 24
#define IFI_CANFD_RXFIFO_DLC_FNR_MASK 0xff
#define IFI_CANFD_RXFIFO_ID 0x6c
#define IFI_CANFD_RXFIFO_ID_ID_OFFSET 0
#define IFI_CANFD_RXFIFO_ID_ID_STD_MASK CAN_SFF_MASK
#define IFI_CANFD_RXFIFO_ID_ID_STD_OFFSET 0
#define IFI_CANFD_RXFIFO_ID_ID_STD_WIDTH 10
#define IFI_CANFD_RXFIFO_ID_ID_XTD_MASK CAN_EFF_MASK
#define IFI_CANFD_RXFIFO_ID_ID_XTD_OFFSET 11
#define IFI_CANFD_RXFIFO_ID_ID_XTD_WIDTH 18
#define IFI_CANFD_RXFIFO_ID_IDE BIT(29)
#define IFI_CANFD_RXFIFO_DATA 0x70 /* 0x70..0xac */
#define IFI_CANFD_TXFIFO_SUSPEND_US 0xb0
#define IFI_CANFD_TXFIFO_REPEATCOUNT 0xb4
#define IFI_CANFD_TXFIFO_DLC 0xb8
#define IFI_CANFD_TXFIFO_DLC_DLC_OFFSET 0
#define IFI_CANFD_TXFIFO_DLC_DLC_MASK 0xf
#define IFI_CANFD_TXFIFO_DLC_RTR BIT(4)
#define IFI_CANFD_TXFIFO_DLC_EDL BIT(5)
#define IFI_CANFD_TXFIFO_DLC_BRS BIT(6)
#define IFI_CANFD_TXFIFO_DLC_FNR_OFFSET 24
#define IFI_CANFD_TXFIFO_DLC_FNR_MASK 0xff
#define IFI_CANFD_TXFIFO_ID 0xbc
#define IFI_CANFD_TXFIFO_ID_ID_OFFSET 0
#define IFI_CANFD_TXFIFO_ID_ID_STD_MASK CAN_SFF_MASK
#define IFI_CANFD_TXFIFO_ID_ID_STD_OFFSET 0
#define IFI_CANFD_TXFIFO_ID_ID_STD_WIDTH 10
#define IFI_CANFD_TXFIFO_ID_ID_XTD_MASK CAN_EFF_MASK
#define IFI_CANFD_TXFIFO_ID_ID_XTD_OFFSET 11
#define IFI_CANFD_TXFIFO_ID_ID_XTD_WIDTH 18
#define IFI_CANFD_TXFIFO_ID_IDE BIT(29)
#define IFI_CANFD_TXFIFO_DATA 0xc0 /* 0xb0..0xfc */
#define IFI_CANFD_FILTER_MASK(n) (0x800 + ((n) * 8) + 0)
#define IFI_CANFD_FILTER_MASK_EXT BIT(29)
#define IFI_CANFD_FILTER_MASK_EDL BIT(30)
#define IFI_CANFD_FILTER_MASK_VALID ((u32)BIT(31))
#define IFI_CANFD_FILTER_IDENT(n) (0x800 + ((n) * 8) + 4)
#define IFI_CANFD_FILTER_IDENT_IDE BIT(29)
#define IFI_CANFD_FILTER_IDENT_CANFD BIT(30)
#define IFI_CANFD_FILTER_IDENT_VALID ((u32)BIT(31))
/* IFI CANFD private data structure */
struct ifi_canfd_priv {
struct can_priv can; /* must be the first member */
struct napi_struct napi;
struct net_device *ndev;
void __iomem *base;
};
static void ifi_canfd_irq_enable(struct net_device *ndev, bool enable)
{
struct ifi_canfd_priv *priv = netdev_priv(ndev);
u32 enirq = 0;
if (enable) {
enirq = IFI_CANFD_IRQMASK_TXFIFO_EMPTY |
IFI_CANFD_IRQMASK_RXFIFO_NEMPTY |
IFI_CANFD_IRQMASK_ERROR_STATE_CHG |
IFI_CANFD_IRQMASK_ERROR_WARNING |
IFI_CANFD_IRQMASK_ERROR_BUSOFF;
if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
enirq |= IFI_CANFD_INTERRUPT_ERROR_COUNTER;
}
writel(IFI_CANFD_IRQMASK_SET_ERR |
IFI_CANFD_IRQMASK_SET_TS |
IFI_CANFD_IRQMASK_SET_TX |
IFI_CANFD_IRQMASK_SET_RX | enirq,
priv->base + IFI_CANFD_IRQMASK);
}
static void ifi_canfd_read_fifo(struct net_device *ndev)
{
struct net_device_stats *stats = &ndev->stats;
struct ifi_canfd_priv *priv = netdev_priv(ndev);
struct canfd_frame *cf;
struct sk_buff *skb;
const u32 rx_irq_mask = IFI_CANFD_INTERRUPT_RXFIFO_NEMPTY |
IFI_CANFD_INTERRUPT_RXFIFO_NEMPTY_PER;
u32 rxdlc, rxid;
u32 dlc, id;
int i;
rxdlc = readl(priv->base + IFI_CANFD_RXFIFO_DLC);
if (rxdlc & IFI_CANFD_RXFIFO_DLC_EDL)
skb = alloc_canfd_skb(ndev, &cf);
else
skb = alloc_can_skb(ndev, (struct can_frame **)&cf);
if (!skb) {
stats->rx_dropped++;
return;
}
dlc = (rxdlc >> IFI_CANFD_RXFIFO_DLC_DLC_OFFSET) &
IFI_CANFD_RXFIFO_DLC_DLC_MASK;
if (rxdlc & IFI_CANFD_RXFIFO_DLC_EDL)
cf->len = can_dlc2len(dlc);
else
cf->len = get_can_dlc(dlc);
rxid = readl(priv->base + IFI_CANFD_RXFIFO_ID);
id = (rxid >> IFI_CANFD_RXFIFO_ID_ID_OFFSET);
if (id & IFI_CANFD_RXFIFO_ID_IDE) {
id &= IFI_CANFD_RXFIFO_ID_ID_XTD_MASK;
/*
* In case the Extended ID frame is received, the standard
* and extended part of the ID are swapped in the register,
* so swap them back to obtain the correct ID.
*/
id = (id >> IFI_CANFD_RXFIFO_ID_ID_XTD_OFFSET) |
((id & IFI_CANFD_RXFIFO_ID_ID_STD_MASK) <<
IFI_CANFD_RXFIFO_ID_ID_XTD_WIDTH);
id |= CAN_EFF_FLAG;
} else {
id &= IFI_CANFD_RXFIFO_ID_ID_STD_MASK;
}
cf->can_id = id;
if (rxdlc & IFI_CANFD_RXFIFO_DLC_ESI) {
cf->flags |= CANFD_ESI;
netdev_dbg(ndev, "ESI Error\n");
}
if (!(rxdlc & IFI_CANFD_RXFIFO_DLC_EDL) &&
(rxdlc & IFI_CANFD_RXFIFO_DLC_RTR)) {
cf->can_id |= CAN_RTR_FLAG;
} else {
if (rxdlc & IFI_CANFD_RXFIFO_DLC_BRS)
cf->flags |= CANFD_BRS;
for (i = 0; i < cf->len; i += 4) {
*(u32 *)(cf->data + i) =
readl(priv->base + IFI_CANFD_RXFIFO_DATA + i);
}
}
/* Remove the packet from FIFO */
writel(IFI_CANFD_RXSTCMD_REMOVE_MSG, priv->base + IFI_CANFD_RXSTCMD);
writel(rx_irq_mask, priv->base + IFI_CANFD_INTERRUPT);
stats->rx_packets++;
stats->rx_bytes += cf->len;
netif_receive_skb(skb);
}
static int ifi_canfd_do_rx_poll(struct net_device *ndev, int quota)
{
struct ifi_canfd_priv *priv = netdev_priv(ndev);
u32 pkts = 0;
u32 rxst;
rxst = readl(priv->base + IFI_CANFD_RXSTCMD);
if (rxst & IFI_CANFD_RXSTCMD_EMPTY) {
netdev_dbg(ndev, "No messages in RX FIFO\n");
return 0;
}
for (;;) {
if (rxst & IFI_CANFD_RXSTCMD_EMPTY)
break;
if (quota <= 0)
break;
ifi_canfd_read_fifo(ndev);
quota--;
pkts++;
rxst = readl(priv->base + IFI_CANFD_RXSTCMD);
}
if (pkts)
can_led_event(ndev, CAN_LED_EVENT_RX);
return pkts;
}
static int ifi_canfd_handle_lost_msg(struct net_device *ndev)
{
struct net_device_stats *stats = &ndev->stats;
struct sk_buff *skb;
struct can_frame *frame;
netdev_err(ndev, "RX FIFO overflow, message(s) lost.\n");
stats->rx_errors++;
stats->rx_over_errors++;
skb = alloc_can_err_skb(ndev, &frame);
if (unlikely(!skb))
return 0;
frame->can_id |= CAN_ERR_CRTL;
frame->data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
netif_receive_skb(skb);
return 1;
}
static int ifi_canfd_handle_lec_err(struct net_device *ndev)
{
struct ifi_canfd_priv *priv = netdev_priv(ndev);
struct net_device_stats *stats = &ndev->stats;
struct can_frame *cf;
struct sk_buff *skb;
u32 errctr = readl(priv->base + IFI_CANFD_ERROR_CTR);
const u32 errmask = IFI_CANFD_ERROR_CTR_OVERLOAD_FIRST |
IFI_CANFD_ERROR_CTR_ACK_ERROR_FIRST |
IFI_CANFD_ERROR_CTR_BIT0_ERROR_FIRST |
IFI_CANFD_ERROR_CTR_BIT1_ERROR_FIRST |
IFI_CANFD_ERROR_CTR_STUFF_ERROR_FIRST |
IFI_CANFD_ERROR_CTR_CRC_ERROR_FIRST |
IFI_CANFD_ERROR_CTR_FORM_ERROR_FIRST;
if (!(errctr & errmask)) /* No error happened. */
return 0;
priv->can.can_stats.bus_error++;
stats->rx_errors++;
/* Propagate the error condition to the CAN stack. */
skb = alloc_can_err_skb(ndev, &cf);
if (unlikely(!skb))
return 0;
/* Read the error counter register and check for new errors. */
cf->can_id |= CAN_ERR_PROT | CAN_ERR_BUSERROR;
if (errctr & IFI_CANFD_ERROR_CTR_OVERLOAD_FIRST)
cf->data[2] |= CAN_ERR_PROT_OVERLOAD;
if (errctr & IFI_CANFD_ERROR_CTR_ACK_ERROR_FIRST)
cf->data[3] = CAN_ERR_PROT_LOC_ACK;
if (errctr & IFI_CANFD_ERROR_CTR_BIT0_ERROR_FIRST)
cf->data[2] |= CAN_ERR_PROT_BIT0;
if (errctr & IFI_CANFD_ERROR_CTR_BIT1_ERROR_FIRST)
cf->data[2] |= CAN_ERR_PROT_BIT1;
if (errctr & IFI_CANFD_ERROR_CTR_STUFF_ERROR_FIRST)
cf->data[2] |= CAN_ERR_PROT_STUFF;
if (errctr & IFI_CANFD_ERROR_CTR_CRC_ERROR_FIRST)
cf->data[3] = CAN_ERR_PROT_LOC_CRC_SEQ;
if (errctr & IFI_CANFD_ERROR_CTR_FORM_ERROR_FIRST)
cf->data[2] |= CAN_ERR_PROT_FORM;
/* Reset the error counter, ack the IRQ and re-enable the counter. */
writel(IFI_CANFD_ERROR_CTR_ER_RESET, priv->base + IFI_CANFD_ERROR_CTR);
writel(IFI_CANFD_INTERRUPT_ERROR_COUNTER,
priv->base + IFI_CANFD_INTERRUPT);
writel(IFI_CANFD_ERROR_CTR_ER_ENABLE, priv->base + IFI_CANFD_ERROR_CTR);
stats->rx_packets++;
stats->rx_bytes += cf->can_dlc;
netif_receive_skb(skb);
return 1;
}
static int ifi_canfd_get_berr_counter(const struct net_device *ndev,
struct can_berr_counter *bec)
{
struct ifi_canfd_priv *priv = netdev_priv(ndev);
u32 err;
err = readl(priv->base + IFI_CANFD_ERROR);
bec->rxerr = (err >> IFI_CANFD_ERROR_RX_OFFSET) &
IFI_CANFD_ERROR_RX_MASK;
bec->txerr = (err >> IFI_CANFD_ERROR_TX_OFFSET) &
IFI_CANFD_ERROR_TX_MASK;
return 0;
}
static int ifi_canfd_handle_state_change(struct net_device *ndev,
enum can_state new_state)
{
struct ifi_canfd_priv *priv = netdev_priv(ndev);
struct net_device_stats *stats = &ndev->stats;
struct can_frame *cf;
struct sk_buff *skb;
struct can_berr_counter bec;
switch (new_state) {
case CAN_STATE_ERROR_ACTIVE:
/* error active state */
priv->can.can_stats.error_warning++;
priv->can.state = CAN_STATE_ERROR_ACTIVE;
break;
case CAN_STATE_ERROR_WARNING:
/* error warning state */
priv->can.can_stats.error_warning++;
priv->can.state = CAN_STATE_ERROR_WARNING;
break;
case CAN_STATE_ERROR_PASSIVE:
/* error passive state */
priv->can.can_stats.error_passive++;
priv->can.state = CAN_STATE_ERROR_PASSIVE;
break;
case CAN_STATE_BUS_OFF:
/* bus-off state */
priv->can.state = CAN_STATE_BUS_OFF;
ifi_canfd_irq_enable(ndev, 0);
priv->can.can_stats.bus_off++;
can_bus_off(ndev);
break;
default:
break;
}
/* propagate the error condition to the CAN stack */
skb = alloc_can_err_skb(ndev, &cf);
if (unlikely(!skb))
return 0;
ifi_canfd_get_berr_counter(ndev, &bec);
switch (new_state) {
case CAN_STATE_ERROR_WARNING:
/* error warning state */
cf->can_id |= CAN_ERR_CRTL;
cf->data[1] = (bec.txerr > bec.rxerr) ?
CAN_ERR_CRTL_TX_WARNING :
CAN_ERR_CRTL_RX_WARNING;
cf->data[6] = bec.txerr;
cf->data[7] = bec.rxerr;
break;
case CAN_STATE_ERROR_PASSIVE:
/* error passive state */
cf->can_id |= CAN_ERR_CRTL;
cf->data[1] |= CAN_ERR_CRTL_RX_PASSIVE;
if (bec.txerr > 127)
cf->data[1] |= CAN_ERR_CRTL_TX_PASSIVE;
cf->data[6] = bec.txerr;
cf->data[7] = bec.rxerr;
break;
case CAN_STATE_BUS_OFF:
/* bus-off state */
cf->can_id |= CAN_ERR_BUSOFF;
break;
default:
break;
}
stats->rx_packets++;
stats->rx_bytes += cf->can_dlc;
netif_receive_skb(skb);
return 1;
}
static int ifi_canfd_handle_state_errors(struct net_device *ndev)
{
struct ifi_canfd_priv *priv = netdev_priv(ndev);
u32 stcmd = readl(priv->base + IFI_CANFD_STCMD);
int work_done = 0;
if ((stcmd & IFI_CANFD_STCMD_ERROR_ACTIVE) &&
(priv->can.state != CAN_STATE_ERROR_ACTIVE)) {
netdev_dbg(ndev, "Error, entered active state\n");
work_done += ifi_canfd_handle_state_change(ndev,
CAN_STATE_ERROR_ACTIVE);
}
if ((stcmd & IFI_CANFD_STCMD_ERROR_WARNING) &&
(priv->can.state != CAN_STATE_ERROR_WARNING)) {
netdev_dbg(ndev, "Error, entered warning state\n");
work_done += ifi_canfd_handle_state_change(ndev,
CAN_STATE_ERROR_WARNING);
}
if ((stcmd & IFI_CANFD_STCMD_ERROR_PASSIVE) &&
(priv->can.state != CAN_STATE_ERROR_PASSIVE)) {
netdev_dbg(ndev, "Error, entered passive state\n");
work_done += ifi_canfd_handle_state_change(ndev,
CAN_STATE_ERROR_PASSIVE);
}
if ((stcmd & IFI_CANFD_STCMD_BUSOFF) &&
(priv->can.state != CAN_STATE_BUS_OFF)) {
netdev_dbg(ndev, "Error, entered bus-off state\n");
work_done += ifi_canfd_handle_state_change(ndev,
CAN_STATE_BUS_OFF);
}
return work_done;
}
static int ifi_canfd_poll(struct napi_struct *napi, int quota)
{
struct net_device *ndev = napi->dev;
struct ifi_canfd_priv *priv = netdev_priv(ndev);
u32 rxstcmd = readl(priv->base + IFI_CANFD_RXSTCMD);
int work_done = 0;
/* Handle bus state changes */
work_done += ifi_canfd_handle_state_errors(ndev);
/* Handle lost messages on RX */
if (rxstcmd & IFI_CANFD_RXSTCMD_OVERFLOW)
work_done += ifi_canfd_handle_lost_msg(ndev);
/* Handle lec errors on the bus */
if (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
work_done += ifi_canfd_handle_lec_err(ndev);
/* Handle normal messages on RX */
if (!(rxstcmd & IFI_CANFD_RXSTCMD_EMPTY))
work_done += ifi_canfd_do_rx_poll(ndev, quota - work_done);
if (work_done < quota) {
napi_complete_done(napi, work_done);
ifi_canfd_irq_enable(ndev, 1);
}
return work_done;
}
static irqreturn_t ifi_canfd_isr(int irq, void *dev_id)
{
struct net_device *ndev = (struct net_device *)dev_id;
struct ifi_canfd_priv *priv = netdev_priv(ndev);
struct net_device_stats *stats = &ndev->stats;
const u32 rx_irq_mask = IFI_CANFD_INTERRUPT_RXFIFO_NEMPTY |
IFI_CANFD_INTERRUPT_RXFIFO_NEMPTY_PER |
IFI_CANFD_INTERRUPT_ERROR_COUNTER |
IFI_CANFD_INTERRUPT_ERROR_STATE_CHG |
IFI_CANFD_INTERRUPT_ERROR_WARNING |
IFI_CANFD_INTERRUPT_ERROR_BUSOFF;
const u32 tx_irq_mask = IFI_CANFD_INTERRUPT_TXFIFO_EMPTY |
IFI_CANFD_INTERRUPT_TXFIFO_REMOVE;
const u32 clr_irq_mask = ~((u32)IFI_CANFD_INTERRUPT_SET_IRQ);
u32 isr;
isr = readl(priv->base + IFI_CANFD_INTERRUPT);
/* No interrupt */
if (isr == 0)
return IRQ_NONE;
/* Clear all pending interrupts but ErrWarn */
writel(clr_irq_mask, priv->base + IFI_CANFD_INTERRUPT);
/* RX IRQ or bus warning, start NAPI */
if (isr & rx_irq_mask) {
ifi_canfd_irq_enable(ndev, 0);
napi_schedule(&priv->napi);
}
/* TX IRQ */
if (isr & IFI_CANFD_INTERRUPT_TXFIFO_REMOVE) {
stats->tx_bytes += can_get_echo_skb(ndev, 0);
stats->tx_packets++;
can_led_event(ndev, CAN_LED_EVENT_TX);
}
if (isr & tx_irq_mask)
netif_wake_queue(ndev);
return IRQ_HANDLED;
}
static const struct can_bittiming_const ifi_canfd_bittiming_const = {
.name = KBUILD_MODNAME,
.tseg1_min = 1, /* Time segment 1 = prop_seg + phase_seg1 */
.tseg1_max = 256,
.tseg2_min = 2, /* Time segment 2 = phase_seg2 */
.tseg2_max = 256,
.sjw_max = 128,
.brp_min = 2,
.brp_max = 512,
.brp_inc = 1,
};
static void ifi_canfd_set_bittiming(struct net_device *ndev)
{
struct ifi_canfd_priv *priv = netdev_priv(ndev);
const struct can_bittiming *bt = &priv->can.bittiming;
const struct can_bittiming *dbt = &priv->can.data_bittiming;
u16 brp, sjw, tseg1, tseg2, tdc;
/* Configure bit timing */
brp = bt->brp - 2;
sjw = bt->sjw - 1;
tseg1 = bt->prop_seg + bt->phase_seg1 - 1;
tseg2 = bt->phase_seg2 - 2;
writel((tseg2 << IFI_CANFD_TIME_TIMEB_OFF) |
(tseg1 << IFI_CANFD_TIME_TIMEA_OFF) |
(brp << IFI_CANFD_TIME_PRESCALE_OFF) |
(sjw << IFI_CANFD_TIME_SJW_OFF_7_9_8_8),
priv->base + IFI_CANFD_TIME);
/* Configure data bit timing */
brp = dbt->brp - 2;
sjw = dbt->sjw - 1;
tseg1 = dbt->prop_seg + dbt->phase_seg1 - 1;
tseg2 = dbt->phase_seg2 - 2;
writel((tseg2 << IFI_CANFD_TIME_TIMEB_OFF) |
(tseg1 << IFI_CANFD_TIME_TIMEA_OFF) |
(brp << IFI_CANFD_TIME_PRESCALE_OFF) |
(sjw << IFI_CANFD_TIME_SJW_OFF_7_9_8_8),
priv->base + IFI_CANFD_FTIME);
/* Configure transmitter delay */
tdc = dbt->brp * (dbt->prop_seg + dbt->phase_seg1);
tdc &= IFI_CANFD_TDELAY_MASK;
writel(IFI_CANFD_TDELAY_EN | tdc, priv->base + IFI_CANFD_TDELAY);
}
static void ifi_canfd_set_filter(struct net_device *ndev, const u32 id,
const u32 mask, const u32 ident)
{
struct ifi_canfd_priv *priv = netdev_priv(ndev);
writel(mask, priv->base + IFI_CANFD_FILTER_MASK(id));
writel(ident, priv->base + IFI_CANFD_FILTER_IDENT(id));
}
static void ifi_canfd_set_filters(struct net_device *ndev)
{
/* Receive all CAN frames (standard ID) */
ifi_canfd_set_filter(ndev, 0,
IFI_CANFD_FILTER_MASK_VALID |
IFI_CANFD_FILTER_MASK_EXT,
IFI_CANFD_FILTER_IDENT_VALID);
/* Receive all CAN frames (extended ID) */
ifi_canfd_set_filter(ndev, 1,
IFI_CANFD_FILTER_MASK_VALID |
IFI_CANFD_FILTER_MASK_EXT,
IFI_CANFD_FILTER_IDENT_VALID |
IFI_CANFD_FILTER_IDENT_IDE);
/* Receive all CANFD frames */
ifi_canfd_set_filter(ndev, 2,
IFI_CANFD_FILTER_MASK_VALID |
IFI_CANFD_FILTER_MASK_EDL |
IFI_CANFD_FILTER_MASK_EXT,
IFI_CANFD_FILTER_IDENT_VALID |
IFI_CANFD_FILTER_IDENT_CANFD |
IFI_CANFD_FILTER_IDENT_IDE);
}
static void ifi_canfd_start(struct net_device *ndev)
{
struct ifi_canfd_priv *priv = netdev_priv(ndev);
u32 stcmd;
/* Reset the IP */
writel(IFI_CANFD_STCMD_HARDRESET, priv->base + IFI_CANFD_STCMD);
writel(IFI_CANFD_STCMD_ENABLE_7_9_8_8_TIMING,
priv->base + IFI_CANFD_STCMD);
ifi_canfd_set_bittiming(ndev);
ifi_canfd_set_filters(ndev);
/* Reset FIFOs */
writel(IFI_CANFD_RXSTCMD_RESET, priv->base + IFI_CANFD_RXSTCMD);
writel(0, priv->base + IFI_CANFD_RXSTCMD);
writel(IFI_CANFD_TXSTCMD_RESET, priv->base + IFI_CANFD_TXSTCMD);
writel(0, priv->base + IFI_CANFD_TXSTCMD);
/* Repeat transmission until successful */
writel(0, priv->base + IFI_CANFD_REPEAT);
writel(0, priv->base + IFI_CANFD_SUSPEND);
/* Clear all pending interrupts */
writel((u32)(~IFI_CANFD_INTERRUPT_SET_IRQ),
priv->base + IFI_CANFD_INTERRUPT);
stcmd = IFI_CANFD_STCMD_ENABLE | IFI_CANFD_STCMD_NORMAL_MODE |
IFI_CANFD_STCMD_ENABLE_7_9_8_8_TIMING;
if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
stcmd |= IFI_CANFD_STCMD_BUSMONITOR;
if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
stcmd |= IFI_CANFD_STCMD_LOOPBACK;
if ((priv->can.ctrlmode & CAN_CTRLMODE_FD) &&
!(priv->can.ctrlmode & CAN_CTRLMODE_FD_NON_ISO))
stcmd |= IFI_CANFD_STCMD_ENABLE_ISO;
if (!(priv->can.ctrlmode & CAN_CTRLMODE_FD))
stcmd |= IFI_CANFD_STCMD_DISABLE_CANFD;
priv->can.state = CAN_STATE_ERROR_ACTIVE;
ifi_canfd_irq_enable(ndev, 1);
/* Unlock, reset and enable the error counter. */
writel(IFI_CANFD_ERROR_CTR_UNLOCK_MAGIC,
priv->base + IFI_CANFD_ERROR_CTR);
writel(IFI_CANFD_ERROR_CTR_ER_RESET, priv->base + IFI_CANFD_ERROR_CTR);
writel(IFI_CANFD_ERROR_CTR_ER_ENABLE, priv->base + IFI_CANFD_ERROR_CTR);
/* Enable controller */
writel(stcmd, priv->base + IFI_CANFD_STCMD);
}
static void ifi_canfd_stop(struct net_device *ndev)
{
struct ifi_canfd_priv *priv = netdev_priv(ndev);
/* Reset and disable the error counter. */
writel(IFI_CANFD_ERROR_CTR_ER_RESET, priv->base + IFI_CANFD_ERROR_CTR);
writel(0, priv->base + IFI_CANFD_ERROR_CTR);
/* Reset the IP */
writel(IFI_CANFD_STCMD_HARDRESET, priv->base + IFI_CANFD_STCMD);
/* Mask all interrupts */
writel(~0, priv->base + IFI_CANFD_IRQMASK);
/* Clear all pending interrupts */
writel((u32)(~IFI_CANFD_INTERRUPT_SET_IRQ),
priv->base + IFI_CANFD_INTERRUPT);
/* Set the state as STOPPED */
priv->can.state = CAN_STATE_STOPPED;
}
static int ifi_canfd_set_mode(struct net_device *ndev, enum can_mode mode)
{
switch (mode) {
case CAN_MODE_START:
ifi_canfd_start(ndev);
netif_wake_queue(ndev);
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
static int ifi_canfd_open(struct net_device *ndev)
{
struct ifi_canfd_priv *priv = netdev_priv(ndev);
int ret;
ret = open_candev(ndev);
if (ret) {
netdev_err(ndev, "Failed to open CAN device\n");
return ret;
}
/* Register interrupt handler */
ret = request_irq(ndev->irq, ifi_canfd_isr, IRQF_SHARED,
ndev->name, ndev);
if (ret < 0) {
netdev_err(ndev, "Failed to request interrupt\n");
goto err_irq;
}
ifi_canfd_start(ndev);
can_led_event(ndev, CAN_LED_EVENT_OPEN);
napi_enable(&priv->napi);
netif_start_queue(ndev);
return 0;
err_irq:
close_candev(ndev);
return ret;
}
static int ifi_canfd_close(struct net_device *ndev)
{
struct ifi_canfd_priv *priv = netdev_priv(ndev);
netif_stop_queue(ndev);
napi_disable(&priv->napi);
ifi_canfd_stop(ndev);
free_irq(ndev->irq, ndev);
close_candev(ndev);
can_led_event(ndev, CAN_LED_EVENT_STOP);
return 0;
}
static netdev_tx_t ifi_canfd_start_xmit(struct sk_buff *skb,
struct net_device *ndev)
{
struct ifi_canfd_priv *priv = netdev_priv(ndev);
struct canfd_frame *cf = (struct canfd_frame *)skb->data;
u32 txst, txid, txdlc;
int i;
if (can_dropped_invalid_skb(ndev, skb))
return NETDEV_TX_OK;
/* Check if the TX buffer is full */
txst = readl(priv->base + IFI_CANFD_TXSTCMD);
if (txst & IFI_CANFD_TXSTCMD_FULL) {
netif_stop_queue(ndev);
netdev_err(ndev, "BUG! TX FIFO full when queue awake!\n");
return NETDEV_TX_BUSY;
}
netif_stop_queue(ndev);
if (cf->can_id & CAN_EFF_FLAG) {
txid = cf->can_id & CAN_EFF_MASK;
/*
* In case the Extended ID frame is transmitted, the
* standard and extended part of the ID are swapped
* in the register, so swap them back to send the
* correct ID.
*/
txid = (txid >> IFI_CANFD_TXFIFO_ID_ID_XTD_WIDTH) |
((txid & IFI_CANFD_TXFIFO_ID_ID_XTD_MASK) <<
IFI_CANFD_TXFIFO_ID_ID_XTD_OFFSET);
txid |= IFI_CANFD_TXFIFO_ID_IDE;
} else {
txid = cf->can_id & CAN_SFF_MASK;
}
txdlc = can_len2dlc(cf->len);
if ((priv->can.ctrlmode & CAN_CTRLMODE_FD) && can_is_canfd_skb(skb)) {
txdlc |= IFI_CANFD_TXFIFO_DLC_EDL;
if (cf->flags & CANFD_BRS)
txdlc |= IFI_CANFD_TXFIFO_DLC_BRS;
}
if (cf->can_id & CAN_RTR_FLAG)
txdlc |= IFI_CANFD_TXFIFO_DLC_RTR;
/* message ram configuration */
writel(txid, priv->base + IFI_CANFD_TXFIFO_ID);
writel(txdlc, priv->base + IFI_CANFD_TXFIFO_DLC);
for (i = 0; i < cf->len; i += 4) {
writel(*(u32 *)(cf->data + i),
priv->base + IFI_CANFD_TXFIFO_DATA + i);
}
writel(0, priv->base + IFI_CANFD_TXFIFO_REPEATCOUNT);
writel(0, priv->base + IFI_CANFD_TXFIFO_SUSPEND_US);
can_put_echo_skb(skb, ndev, 0);
/* Start the transmission */
writel(IFI_CANFD_TXSTCMD_ADD_MSG, priv->base + IFI_CANFD_TXSTCMD);
return NETDEV_TX_OK;
}
static const struct net_device_ops ifi_canfd_netdev_ops = {
.ndo_open = ifi_canfd_open,
.ndo_stop = ifi_canfd_close,
.ndo_start_xmit = ifi_canfd_start_xmit,
.ndo_change_mtu = can_change_mtu,
};
static int ifi_canfd_plat_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct net_device *ndev;
struct ifi_canfd_priv *priv;
struct resource *res;
void __iomem *addr;
int irq, ret;
u32 id, rev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
addr = devm_ioremap_resource(dev, res);
irq = platform_get_irq(pdev, 0);
if (IS_ERR(addr) || irq < 0)
return -EINVAL;
id = readl(addr + IFI_CANFD_IP_ID);
if (id != IFI_CANFD_IP_ID_VALUE) {
dev_err(dev, "This block is not IFI CANFD, id=%08x\n", id);
return -EINVAL;
}
rev = readl(addr + IFI_CANFD_VER) & IFI_CANFD_VER_REV_MASK;
if (rev < IFI_CANFD_VER_REV_MIN_SUPPORTED) {
dev_err(dev, "This block is too old (rev %i), minimum supported is rev %i\n",
rev, IFI_CANFD_VER_REV_MIN_SUPPORTED);
return -EINVAL;
}
ndev = alloc_candev(sizeof(*priv), 1);
if (!ndev)
return -ENOMEM;
ndev->irq = irq;
ndev->flags |= IFF_ECHO; /* we support local echo */
ndev->netdev_ops = &ifi_canfd_netdev_ops;
priv = netdev_priv(ndev);
priv->ndev = ndev;
priv->base = addr;
netif_napi_add(ndev, &priv->napi, ifi_canfd_poll, 64);
priv->can.state = CAN_STATE_STOPPED;
priv->can.clock.freq = readl(addr + IFI_CANFD_CANCLOCK);
priv->can.bittiming_const = &ifi_canfd_bittiming_const;
priv->can.data_bittiming_const = &ifi_canfd_bittiming_const;
priv->can.do_set_mode = ifi_canfd_set_mode;
priv->can.do_get_berr_counter = ifi_canfd_get_berr_counter;
/* IFI CANFD can do both Bosch FD and ISO FD */
priv->can.ctrlmode = CAN_CTRLMODE_FD;
/* IFI CANFD can do both Bosch FD and ISO FD */
priv->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
CAN_CTRLMODE_LISTENONLY |
CAN_CTRLMODE_FD |
CAN_CTRLMODE_FD_NON_ISO |
CAN_CTRLMODE_BERR_REPORTING;
platform_set_drvdata(pdev, ndev);
SET_NETDEV_DEV(ndev, dev);
ret = register_candev(ndev);
if (ret) {
dev_err(dev, "Failed to register (ret=%d)\n", ret);
goto err_reg;
}
devm_can_led_init(ndev);
dev_info(dev, "Driver registered: regs=%p, irq=%d, clock=%d\n",
priv->base, ndev->irq, priv->can.clock.freq);
return 0;
err_reg:
free_candev(ndev);
return ret;
}
static int ifi_canfd_plat_remove(struct platform_device *pdev)
{
struct net_device *ndev = platform_get_drvdata(pdev);
unregister_candev(ndev);
platform_set_drvdata(pdev, NULL);
free_candev(ndev);
return 0;
}
static const struct of_device_id ifi_canfd_of_table[] = {
{ .compatible = "ifi,canfd-1.0", .data = NULL },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, ifi_canfd_of_table);
static struct platform_driver ifi_canfd_plat_driver = {
.driver = {
.name = KBUILD_MODNAME,
.of_match_table = ifi_canfd_of_table,
},
.probe = ifi_canfd_plat_probe,
.remove = ifi_canfd_plat_remove,
};
module_platform_driver(ifi_canfd_plat_driver);
MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("CAN bus driver for IFI CANFD controller");
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