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CoolPi-Armbian-Rockchip-RK3.../drivers/net/can/rockchip/rk3562_can.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2022 Rockchip Electronics Co., Ltd.
* Rk3562 CAN driver
*/
#include <linux/delay.h>
#include <linux/iopoll.h>
#include <linux/pinctrl/consumer.h>
#include <linux/clk.h>
#include <linux/errno.h>
#include <linux/init.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/skbuff.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/can/dev.h>
#include <linux/can/error.h>
#include <linux/reset.h>
#include <linux/pm_runtime.h>
/* registers definition */
enum rk3562_can_reg {
CAN_MODE = 0x00,
CAN_CMD = 0x04,
CAN_STATE = 0x08,
CAN_INT = 0x0c,
CAN_INT_MASK = 0x10,
CAN_LOSTARB_CODE = 0x28,
CAN_ERR_CODE = 0x2c,
CAN_RX_ERR_CNT = 0x34,
CAN_TX_ERR_CNT = 0x38,
CAN_IDCODE = 0x3c,
CAN_IDMASK = 0x40,
CAN_NBTP = 0x100,
CAN_DBTP = 0x104,
CAN_TDCR = 0x108,
CAN_TSCC = 0x10c,
CAN_TSCV = 0x110,
CAN_TXEFC = 0x114,
CAN_RXFC = 0x118,
CAN_AFC = 0x11c,
CAN_IDCODE0 = 0x120,
CAN_IDMASK0 = 0x124,
CAN_IDCODE1 = 0x128,
CAN_IDMASK1 = 0x12c,
CAN_IDCODE2 = 0x130,
CAN_IDMASK2 = 0x134,
CAN_IDCODE3 = 0x138,
CAN_IDMASK3 = 0x13c,
CAN_IDCODE4 = 0x140,
CAN_IDMASK4 = 0x144,
CAN_TXFIC = 0x200,
CAN_TXID = 0x204,
CAN_TXDAT0 = 0x208,
CAN_TXDAT1 = 0x20c,
CAN_TXDAT2 = 0x210,
CAN_TXDAT3 = 0x214,
CAN_TXDAT4 = 0x218,
CAN_TXDAT5 = 0x21c,
CAN_TXDAT6 = 0x220,
CAN_TXDAT7 = 0x224,
CAN_TXDAT8 = 0x228,
CAN_TXDAT9 = 0x22c,
CAN_TXDAT10 = 0x230,
CAN_TXDAT11 = 0x234,
CAN_TXDAT12 = 0x238,
CAN_TXDAT13 = 0x23c,
CAN_TXDAT14 = 0x240,
CAN_TXDAT15 = 0x244,
CAN_RXFIC = 0x300,
CAN_RXID = 0x304,
CAN_RXTS = 0x308,
CAN_RXDAT0 = 0x30c,
CAN_RXDAT1 = 0x310,
CAN_RXDAT2 = 0x314,
CAN_RXDAT3 = 0x318,
CAN_RXDAT4 = 0x31c,
CAN_RXDAT5 = 0x320,
CAN_RXDAT6 = 0x324,
CAN_RXDAT7 = 0x328,
CAN_RXDAT8 = 0x32c,
CAN_RXDAT9 = 0x330,
CAN_RXDAT10 = 0x334,
CAN_RXDAT11 = 0x338,
CAN_RXDAT12 = 0x33c,
CAN_RXDAT13 = 0x340,
CAN_RXDAT14 = 0x344,
CAN_RXDAT15 = 0x348,
CAN_RXFRD = 0x400,
CAN_TXEFRD = 0x500,
CAN_SPACR_CTRL = 0x700,
CAN_FIFO_INFO = 0x704,
CAN_TXCRC_DEBUG = 0x7c4,
};
enum {
ROCKCHIP_RK3562_CAN_MODE = 0,
ROCKCHIP_RK3562_CANFD_MODE,
};
#define DATE_LENGTH_12_BYTE (0x9)
#define DATE_LENGTH_16_BYTE (0xa)
#define DATE_LENGTH_20_BYTE (0xb)
#define DATE_LENGTH_24_BYTE (0xc)
#define DATE_LENGTH_32_BYTE (0xd)
#define DATE_LENGTH_48_BYTE (0xe)
#define DATE_LENGTH_64_BYTE (0xf)
#define CAN_TX0_REQ BIT(0)
#define CAN_TX1_REQ BIT(1)
#define CAN_TX_REQ_FULL ((CAN_TX0_REQ) | (CAN_TX1_REQ))
#define MODE_FDOE BIT(15)
#define MODE_BRSD BIT(13)
#define MODE_SPACE_RX BIT(12)
#define MODE_AUTO_RETX BIT(10)
#define MODE_RXSORT BIT(7)
#define MODE_TXORDER BIT(6)
#define MODE_RXSTX BIT(5)
#define MODE_LBACK BIT(4)
#define MODE_SILENT BIT(3)
#define MODE_SELF_TEST BIT(2)
#define MODE_SLEEP BIT(1)
#define RESET_MODE 0
#define WORK_MODE BIT(0)
#define RX_FINISH_INT BIT(0)
#define TX_FINISH_INT BIT(1)
#define ERR_WARN_INT BIT(2)
#define RX_BUF_OV_INT BIT(3)
#define PASSIVE_ERR_INT BIT(4)
#define TX_LOSTARB_INT BIT(5)
#define BUS_ERR_INT BIT(6)
#define RX_FIFO_FULL_INT BIT(7)
#define RX_FIFO_OV_INT BIT(8)
#define BUS_OFF_INT BIT(9)
#define BUS_OFF_RECOVERY_INT BIT(10)
#define TSC_OV_INT BIT(11)
#define TXE_FIFO_OV_INT BIT(12)
#define TXE_FIFO_FULL_INT BIT(13)
#define WAKEUP_INT BIT(14)
#define TIMEOUT_INT BIT(15)
#define ERR_TYPE_MASK GENMASK(28, 26)
#define ERR_TYPE_SHIFT 26
#define BIT_ERR 0
#define STUFF_ERR 1
#define FORM_ERR 2
#define ACK_ERR 3
#define CRC_ERR 4
#define ERR_DIR_RX BIT(25)
#define ERR_TX_ERR_MASK GENMASK(24, 16)
#define ERR_LOC_MASK GENMASK(15, 0)
/* Nominal Bit Timing & Prescaler Register (NBTP) */
#define NBTP_MODE_3_SAMPLES BIT(31)
#define NBTP_NSJW_SHIFT 24
#define NBTP_NSJW_MASK (0x7f << NBTP_NSJW_SHIFT)
#define NBTP_NBRP_SHIFT 16
#define NBTP_NBRP_MASK (0xff << NBTP_NBRP_SHIFT)
#define NBTP_NTSEG2_SHIFT 8
#define NBTP_NTSEG2_MASK (0x7f << NBTP_NTSEG2_SHIFT)
#define NBTP_NTSEG1_SHIFT 0
#define NBTP_NTSEG1_MASK (0x7f << NBTP_NTSEG1_SHIFT)
/* Data Bit Timing & Prescaler Register (DBTP) */
#define DBTP_MODE_3_SAMPLES BIT(21)
#define DBTP_DSJW_SHIFT 17
#define DBTP_DSJW_MASK (0xf << DBTP_DSJW_SHIFT)
#define DBTP_DBRP_SHIFT 9
#define DBTP_DBRP_MASK (0xff << DBTP_DBRP_SHIFT)
#define DBTP_DTSEG2_SHIFT 5
#define DBTP_DTSEG2_MASK (0xf << DBTP_DTSEG2_SHIFT)
#define DBTP_DTSEG1_SHIFT 0
#define DBTP_DTSEG1_MASK (0x1f << DBTP_DTSEG1_SHIFT)
/* Transmitter Delay Compensation Register (TDCR) */
#define TDCR_TDCO_SHIFT 1
#define TDCR_TDCO_MASK (0x3f << TDCR_TDCO_SHIFT)
#define TDCR_TDC_ENABLE BIT(0)
#define TX_FD_ENABLE BIT(5)
#define TX_FD_BRS_ENABLE BIT(4)
#define FIFO_ENABLE BIT(0)
#define FIFO_FIXED_DATA BIT(2)
#define RX_FIFO_CNT0_SHIFT 4
#define RX_FIFO_CNT0_MASK (0x7 << RX_FIFO_CNT0_SHIFT)
#define RX_FIFO_CNT1_SHIFT 5
#define RX_FIFO_CNT1_MASK (0x7 << RX_FIFO_CNT1_SHIFT)
#define RX_FIFO_CNT2_SHIFT 24
#define RX_FIFO_CNT2_MASK (0xff << RX_FIFO_CNT2_SHIFT)
#define FORMAT_SHIFT 7
#define FORMAT_MASK (0x1 << FORMAT_SHIFT)
#define RTR_SHIFT 6
#define RTR_MASK (0x1 << RTR_SHIFT)
#define FDF_SHIFT 5
#define FDF_MASK (0x1 << FDF_SHIFT)
#define BRS_SHIFT 4
#define BRS_MASK (0x1 << BRS_SHIFT)
#define DLC_SHIFT 0
#define DLC_MASK (0xF << DLC_SHIFT)
#define CAN_RF_SIZE 0x48
#define CAN_TEF_SIZE 0x8
#define CAN_TXEFRD_OFFSET(n) (CAN_TXEFRD + CAN_TEF_SIZE * (n))
#define CAN_RXFRD_OFFSET(n) (CAN_RXFRD + CAN_RF_SIZE * (n))
#define CAN_RX_FILTER_MASK 0x1fffffff
#define CAN_SPACE_CTRL_INIT 0x0a010100
#define CAN_BUSOFF_FLAG 0x20
#define CAN_FIFO_INFO_CNT_MASK 0xff
#define DRV_NAME "rk3562_can"
/* rk3562_can private data structure */
struct rk3562_can {
struct can_priv can;
struct device *dev;
struct napi_struct napi;
struct clk_bulk_data *clks;
int num_clks;
struct reset_control *reset;
void __iomem *base;
u32 irqstatus;
unsigned long mode;
int rx_fifo_shift;
u32 rx_fifo_mask;
int rx_fifo_depth;
int rx_max_data;
};
static inline u32 rk3562_can_read(const struct rk3562_can *priv,
enum rk3562_can_reg reg)
{
return readl(priv->base + reg);
}
static inline void rk3562_can_write(const struct rk3562_can *priv,
enum rk3562_can_reg reg, u32 val)
{
writel(val, priv->base + reg);
}
static const struct can_bittiming_const rk3562_can_bittiming_const = {
.name = DRV_NAME,
.tseg1_min = 1,
.tseg1_max = 128,
.tseg2_min = 1,
.tseg2_max = 128,
.sjw_max = 128,
.brp_min = 1,
.brp_max = 256,
.brp_inc = 2,
};
static const struct can_bittiming_const rk3562_can_data_bittiming_const = {
.name = DRV_NAME,
.tseg1_min = 1,
.tseg1_max = 32,
.tseg2_min = 1,
.tseg2_max = 16,
.sjw_max = 16,
.brp_min = 1,
.brp_max = 256,
.brp_inc = 2,
};
static int set_reset_mode(struct net_device *ndev)
{
struct rk3562_can *rcan = netdev_priv(ndev);
reset_control_assert(rcan->reset);
udelay(2);
reset_control_deassert(rcan->reset);
rk3562_can_write(rcan, CAN_MODE, 0);
netdev_dbg(ndev, "%s MODE=0x%08x\n", __func__,
rk3562_can_read(rcan, CAN_MODE));
return 0;
}
static int set_normal_mode(struct net_device *ndev)
{
struct rk3562_can *rcan = netdev_priv(ndev);
u32 val;
val = rk3562_can_read(rcan, CAN_MODE);
val |= WORK_MODE;
rk3562_can_write(rcan, CAN_MODE, val);
netdev_dbg(ndev, "%s MODE=0x%08x\n", __func__,
rk3562_can_read(rcan, CAN_MODE));
return 0;
}
/* bittiming is called in reset_mode only */
static int rk3562_can_set_bittiming(struct net_device *ndev)
{
struct rk3562_can *rcan = netdev_priv(ndev);
const struct can_bittiming *bt = &rcan->can.bittiming;
const struct can_bittiming *dbt = &rcan->can.data_bittiming;
u16 brp, sjw, tseg1, tseg2;
u32 reg_btp;
brp = (bt->brp >> 1) - 1;
sjw = bt->sjw - 1;
tseg1 = bt->prop_seg + bt->phase_seg1 - 1;
tseg2 = bt->phase_seg2 - 1;
reg_btp = (brp << NBTP_NBRP_SHIFT) | (sjw << NBTP_NSJW_SHIFT) |
(tseg1 << NBTP_NTSEG1_SHIFT) |
(tseg2 << NBTP_NTSEG2_SHIFT);
if (rcan->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
reg_btp |= NBTP_MODE_3_SAMPLES;
rk3562_can_write(rcan, CAN_NBTP, reg_btp);
if (rcan->can.ctrlmode & CAN_CTRLMODE_FD) {
reg_btp = 0;
brp = (dbt->brp >> 1) - 1;
sjw = dbt->sjw - 1;
tseg1 = dbt->prop_seg + dbt->phase_seg1 - 1;
tseg2 = dbt->phase_seg2 - 1;
if (dbt->bitrate > 2200000) {
u32 tdco;
/* Equation based on Bosch's ROCKCHIP_CAN User Manual's
* Transmitter Delay Compensation Section
*/
tdco = (rcan->can.clock.freq / dbt->bitrate) * 2 / 3;
/* Max valid TDCO value is 63 */
if (tdco > 63)
tdco = 63;
rk3562_can_write(rcan, CAN_TDCR,
(tdco << TDCR_TDCO_SHIFT) |
TDCR_TDC_ENABLE);
}
reg_btp |= (brp << DBTP_DBRP_SHIFT) |
(sjw << DBTP_DSJW_SHIFT) |
(tseg1 << DBTP_DTSEG1_SHIFT) |
(tseg2 << DBTP_DTSEG2_SHIFT);
if (rcan->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
reg_btp |= DBTP_MODE_3_SAMPLES;
rk3562_can_write(rcan, CAN_DBTP, reg_btp);
}
netdev_dbg(ndev, "%s NBTP=0x%08x, DBTP=0x%08x, TDCR=0x%08x\n", __func__,
rk3562_can_read(rcan, CAN_NBTP),
rk3562_can_read(rcan, CAN_DBTP),
rk3562_can_read(rcan, CAN_TDCR));
return 0;
}
static int rk3562_can_get_berr_counter(const struct net_device *ndev,
struct can_berr_counter *bec)
{
struct rk3562_can *rcan = netdev_priv(ndev);
int err;
err = pm_runtime_get_sync(rcan->dev);
if (err < 0) {
netdev_err(ndev, "%s: pm_runtime_get failed(%d)\n",
__func__, err);
return err;
}
bec->rxerr = rk3562_can_read(rcan, CAN_RX_ERR_CNT);
bec->txerr = rk3562_can_read(rcan, CAN_TX_ERR_CNT);
pm_runtime_put(rcan->dev);
netdev_dbg(ndev, "%s RX_ERR_CNT=0x%08x, TX_ERR_CNT=0x%08x\n", __func__,
rk3562_can_read(rcan, CAN_RX_ERR_CNT),
rk3562_can_read(rcan, CAN_TX_ERR_CNT));
return 0;
}
static int rk3562_can_start(struct net_device *ndev)
{
struct rk3562_can *rcan = netdev_priv(ndev);
u32 val;
/* we need to enter the reset mode */
set_reset_mode(ndev);
rk3562_can_write(rcan, CAN_INT_MASK, 0);
/* RECEIVING FILTER, accept all */
rk3562_can_write(rcan, CAN_IDCODE, 0);
rk3562_can_write(rcan, CAN_IDMASK, CAN_RX_FILTER_MASK);
rk3562_can_write(rcan, CAN_IDCODE0, 0);
rk3562_can_write(rcan, CAN_IDMASK0, CAN_RX_FILTER_MASK);
rk3562_can_write(rcan, CAN_IDCODE1, 0);
rk3562_can_write(rcan, CAN_IDMASK1, CAN_RX_FILTER_MASK);
rk3562_can_write(rcan, CAN_IDCODE2, 0);
rk3562_can_write(rcan, CAN_IDMASK2, CAN_RX_FILTER_MASK);
rk3562_can_write(rcan, CAN_IDCODE3, 0);
rk3562_can_write(rcan, CAN_IDMASK3, CAN_RX_FILTER_MASK);
rk3562_can_write(rcan, CAN_IDCODE4, 0);
rk3562_can_write(rcan, CAN_IDMASK4, CAN_RX_FILTER_MASK);
/* set mode */
val = rk3562_can_read(rcan, CAN_MODE);
/* rx fifo enable */
rk3562_can_write(rcan, CAN_RXFC,
rk3562_can_read(rcan, CAN_RXFC) | FIFO_ENABLE |
(rcan->rx_max_data << 3) | FIFO_FIXED_DATA);
/* Mode */
val |= MODE_FDOE;
/* Loopback Mode */
if (rcan->can.ctrlmode & CAN_CTRLMODE_LOOPBACK)
val |= MODE_SELF_TEST | MODE_LBACK;
/* Listen-only mode */
if (rcan->can.ctrlmode & CAN_CTRLMODE_LISTENONLY)
val |= MODE_SILENT;
rk3562_can_write(rcan, CAN_MODE, val);
rk3562_can_set_bittiming(ndev);
rk3562_can_write(rcan, CAN_SPACR_CTRL, CAN_SPACE_CTRL_INIT);
set_normal_mode(ndev);
rcan->can.state = CAN_STATE_ERROR_ACTIVE;
netdev_dbg(ndev, "%s MODE=0x%08x, INT_MASK=0x%08x\n", __func__,
rk3562_can_read(rcan, CAN_MODE),
rk3562_can_read(rcan, CAN_INT_MASK));
return 0;
}
static int rk3562_can_stop(struct net_device *ndev)
{
struct rk3562_can *rcan = netdev_priv(ndev);
rcan->can.state = CAN_STATE_STOPPED;
/* we need to enter reset mode */
set_reset_mode(ndev);
/* disable all interrupts */
rk3562_can_write(rcan, CAN_INT_MASK, 0xffff);
netdev_dbg(ndev, "%s MODE=0x%08x, INT_MASK=0x%08x\n", __func__,
rk3562_can_read(rcan, CAN_MODE),
rk3562_can_read(rcan, CAN_INT_MASK));
return 0;
}
static int rk3562_can_set_mode(struct net_device *ndev,
enum can_mode mode)
{
int err;
switch (mode) {
case CAN_MODE_START:
err = rk3562_can_start(ndev);
if (err) {
netdev_err(ndev, "starting CAN controller failed!\n");
return err;
}
if (netif_queue_stopped(ndev))
netif_wake_queue(ndev);
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
/* transmit a CAN message
* message layout in the sk_buff should be like this:
* xx xx xx xx ff ll 00 11 22 33 44 55 66 77
* [ can_id ] [flags] [len] [can data (up to 8 bytes]
*/
static netdev_tx_t rk3562_can_start_xmit(struct sk_buff *skb,
struct net_device *ndev)
{
struct rk3562_can *rcan = netdev_priv(ndev);
struct canfd_frame *cf = (struct canfd_frame *)skb->data;
u32 id, dlc;
u32 cmd = CAN_TX0_REQ;
int i;
if (can_dropped_invalid_skb(ndev, skb))
return NETDEV_TX_OK;
netif_stop_queue(ndev);
if (rk3562_can_read(rcan, CAN_CMD) & CAN_TX0_REQ)
cmd = CAN_TX1_REQ;
/* Watch carefully on the bit sequence */
if (cf->can_id & CAN_EFF_FLAG) {
/* Extended CAN ID format */
id = cf->can_id & CAN_EFF_MASK;
dlc = can_fd_len2dlc(cf->len) & DLC_MASK;
dlc |= FORMAT_MASK;
/* Extended frames remote TX request */
if (cf->can_id & CAN_RTR_FLAG)
dlc |= RTR_MASK;
} else {
/* Standard CAN ID format */
id = cf->can_id & CAN_SFF_MASK;
dlc = can_fd_len2dlc(cf->len) & DLC_MASK;
/* Standard frames remote TX request */
if (cf->can_id & CAN_RTR_FLAG)
dlc |= RTR_MASK;
}
if ((rcan->can.ctrlmode & CAN_CTRLMODE_FD) && can_is_canfd_skb(skb)) {
dlc |= TX_FD_ENABLE;
if (cf->flags & CANFD_BRS)
dlc |= TX_FD_BRS_ENABLE;
}
rk3562_can_write(rcan, CAN_TXID, id);
rk3562_can_write(rcan, CAN_TXFIC, dlc);
for (i = 0; i < cf->len; i += 4)
rk3562_can_write(rcan, CAN_TXDAT0 + i,
*(u32 *)(cf->data + i));
can_put_echo_skb(skb, ndev, 0, 0);
rk3562_can_write(rcan, CAN_CMD, cmd);
return NETDEV_TX_OK;
}
static int rk3562_can_rx(struct net_device *ndev)
{
struct rk3562_can *rcan = netdev_priv(ndev);
struct net_device_stats *stats = &ndev->stats;
struct canfd_frame *cf;
struct sk_buff *skb;
u32 id_rk3562_can, dlc;
int i = 0;
u32 data[16] = {0};
dlc = rk3562_can_read(rcan, CAN_RXFRD);
id_rk3562_can = rk3562_can_read(rcan, CAN_RXFRD);
for (i = 0; i < (rcan->rx_max_data - 2); i++)
data[i] = rk3562_can_read(rcan, CAN_RXFRD);
/* create zero'ed CAN frame buffer */
if (dlc & FDF_MASK)
skb = alloc_canfd_skb(ndev, &cf);
else
skb = alloc_can_skb(ndev, (struct can_frame **)&cf);
if (!skb) {
stats->rx_dropped++;
return 1;
}
/* Change CAN data length format to socketCAN data format */
if (dlc & FDF_MASK)
cf->len = can_fd_dlc2len(dlc & DLC_MASK);
else
cf->len = can_cc_dlc2len(dlc & DLC_MASK);
/* Change CAN ID format to socketCAN ID format */
if (dlc & FORMAT_MASK) {
/* The received frame is an Extended format frame */
cf->can_id = id_rk3562_can;
cf->can_id |= CAN_EFF_FLAG;
if (dlc & RTR_MASK)
cf->can_id |= CAN_RTR_FLAG;
} else {
/* The received frame is a standard format frame */
cf->can_id = id_rk3562_can;
if (dlc & RTR_MASK)
cf->can_id |= CAN_RTR_FLAG;
}
if (dlc & BRS_MASK)
cf->flags |= CANFD_BRS;
if (!(cf->can_id & CAN_RTR_FLAG)) {
/* Change CAN data format to socketCAN data format */
for (i = 0; i < cf->len; i += 4)
*(u32 *)(cf->data + i) = data[i / 4];
}
stats->rx_packets++;
stats->rx_bytes += cf->len;
netif_rx(skb);
return 1;
}
/* rk3562_can_rx_poll - Poll routine for rx packets (NAPI)
* @napi: napi structure pointer
* @quota: Max number of rx packets to be processed.
*
* This is the poll routine for rx part.
* It will process the packets maximux quota value.
*
* Return: number of packets received
*/
static int rk3562_can_rx_poll(struct napi_struct *napi, int quota)
{
struct net_device *ndev = napi->dev;
struct rk3562_can *rcan = netdev_priv(ndev);
int work_done = 0;
u32 cnt;
quota = (rk3562_can_read(rcan, CAN_RXFC) & rcan->rx_fifo_mask) >>
rcan->rx_fifo_shift;
cnt = rk3562_can_read(rcan, CAN_FIFO_INFO) & CAN_FIFO_INFO_CNT_MASK;
cnt = cnt / rcan->rx_max_data;
if (cnt != quota)
quota = cnt;
while (work_done < quota)
work_done += rk3562_can_rx(ndev);
if (work_done <= rcan->rx_fifo_depth) {
napi_complete_done(napi, work_done);
rk3562_can_write(rcan, CAN_INT_MASK, 0);
}
return work_done;
}
static int rk3562_can_err(struct net_device *ndev, u32 isr)
{
struct rk3562_can *rcan = netdev_priv(ndev);
struct net_device_stats *stats = &ndev->stats;
struct can_frame *cf;
struct sk_buff *skb;
unsigned int rxerr, txerr;
u32 sta_reg, err_code;
skb = alloc_can_err_skb(ndev, &cf);
rxerr = rk3562_can_read(rcan, CAN_RX_ERR_CNT);
txerr = rk3562_can_read(rcan, CAN_TX_ERR_CNT);
sta_reg = rk3562_can_read(rcan, CAN_STATE);
err_code = rk3562_can_read(rcan, CAN_ERR_CODE);
if ((isr & TX_LOSTARB_INT) ||
((!(err_code & ERR_DIR_RX)) &&
(err_code & ERR_TX_ERR_MASK))) {
err_code = rk3562_can_read(rcan, CAN_ERR_CODE);
err_code = rk3562_can_read(rcan, CAN_CMD);
rk3562_can_write(rcan, CAN_CMD, CAN_TX0_REQ);
}
if (skb) {
cf->data[6] = txerr;
cf->data[7] = rxerr;
}
if (isr & BUS_OFF_INT) {
rcan->can.state = CAN_STATE_BUS_OFF;
rcan->can.can_stats.bus_off++;
cf->can_id |= CAN_ERR_BUSOFF;
} else if (isr & ERR_WARN_INT) {
rcan->can.can_stats.error_warning++;
rcan->can.state = CAN_STATE_ERROR_WARNING;
/* error warning state */
if (likely(skb)) {
cf->can_id |= CAN_ERR_CRTL;
cf->data[1] = (txerr > rxerr) ?
CAN_ERR_CRTL_TX_WARNING :
CAN_ERR_CRTL_RX_WARNING;
cf->data[6] = txerr;
cf->data[7] = rxerr;
}
} else if (isr & PASSIVE_ERR_INT) {
rcan->can.can_stats.error_passive++;
rcan->can.state = CAN_STATE_ERROR_PASSIVE;
/* error passive state */
cf->can_id |= CAN_ERR_CRTL;
cf->data[1] = (txerr > rxerr) ?
CAN_ERR_CRTL_TX_WARNING :
CAN_ERR_CRTL_RX_WARNING;
cf->data[6] = txerr;
cf->data[7] = rxerr;
}
if (rcan->can.state >= CAN_STATE_BUS_OFF ||
((sta_reg & CAN_BUSOFF_FLAG) == CAN_BUSOFF_FLAG))
can_bus_off(ndev);
stats->rx_packets++;
stats->rx_bytes += cf->can_dlc;
netif_rx(skb);
return 0;
}
static irqreturn_t rk3562_can_interrupt(int irq, void *dev_id)
{
struct net_device *ndev = (struct net_device *)dev_id;
struct rk3562_can *rcan = netdev_priv(ndev);
struct net_device_stats *stats = &ndev->stats;
u32 err_int = ERR_WARN_INT | RX_BUF_OV_INT | PASSIVE_ERR_INT |
TX_LOSTARB_INT | BUS_ERR_INT | BUS_OFF_INT;
u32 isr;
isr = rk3562_can_read(rcan, CAN_INT);
if (isr & RX_FINISH_INT) {
rk3562_can_write(rcan, CAN_INT_MASK,
RX_FINISH_INT | TIMEOUT_INT);
napi_schedule(&rcan->napi);
}
if (isr & TX_FINISH_INT) {
rk3562_can_write(rcan, CAN_CMD, 0);
stats->tx_bytes += can_get_echo_skb(ndev, 0, NULL);
stats->tx_packets++;
netif_wake_queue(ndev);
}
if (isr & err_int) {
/* error interrupt */
if (rk3562_can_err(ndev, isr))
netdev_err(ndev, "can't allocate buffer - clearing pending interrupts\n");
}
rk3562_can_write(rcan, CAN_INT, isr);
return IRQ_HANDLED;
}
static int rk3562_can_open(struct net_device *ndev)
{
struct rk3562_can *rcan = netdev_priv(ndev);
int err;
/* common open */
err = open_candev(ndev);
if (err)
return err;
err = pm_runtime_get_sync(rcan->dev);
if (err < 0) {
netdev_err(ndev, "%s: pm_runtime_get failed(%d)\n",
__func__, err);
goto exit;
}
err = rk3562_can_start(ndev);
if (err) {
netdev_err(ndev, "could not start CAN peripheral\n");
goto exit_can_start;
}
napi_enable(&rcan->napi);
netif_start_queue(ndev);
netdev_dbg(ndev, "%s\n", __func__);
return 0;
exit_can_start:
pm_runtime_put(rcan->dev);
exit:
close_candev(ndev);
return err;
}
static int rk3562_can_close(struct net_device *ndev)
{
struct rk3562_can *rcan = netdev_priv(ndev);
netif_stop_queue(ndev);
napi_disable(&rcan->napi);
rk3562_can_stop(ndev);
close_candev(ndev);
pm_runtime_put(rcan->dev);
netdev_dbg(ndev, "%s\n", __func__);
return 0;
}
static const struct net_device_ops rk3562_can_netdev_ops = {
.ndo_open = rk3562_can_open,
.ndo_stop = rk3562_can_close,
.ndo_start_xmit = rk3562_can_start_xmit,
.ndo_change_mtu = can_change_mtu,
};
/**
* rk3562_can_suspend - Suspend method for the driver
* @dev: Address of the device structure
*
* Put the driver into low power mode.
* Return: 0 on success and failure value on error
*/
static int rk3562_can_suspend(struct device *dev)
{
struct net_device *ndev = dev_get_drvdata(dev);
if (netif_running(ndev)) {
netif_stop_queue(ndev);
netif_device_detach(ndev);
rk3562_can_stop(ndev);
}
return pm_runtime_force_suspend(dev);
}
/**
* rk3562_can_resume - Resume from suspend
* @dev: Address of the device structure
*
* Resume operation after suspend.
* Return: 0 on success and failure value on error
*/
static int rk3562_can_resume(struct device *dev)
{
struct net_device *ndev = dev_get_drvdata(dev);
int ret;
ret = pm_runtime_force_resume(dev);
if (ret) {
dev_err(dev, "pm_runtime_force_resume failed on resume\n");
return ret;
}
if (netif_running(ndev)) {
ret = rk3562_can_start(ndev);
if (ret) {
dev_err(dev, "rk3562_can_chip_start failed on resume\n");
return ret;
}
netif_device_attach(ndev);
netif_start_queue(ndev);
}
return 0;
}
/**
* rk3562_can_runtime_suspend - Runtime suspend method for the driver
* @dev: Address of the device structure
*
* Put the driver into low power mode.
* Return: 0 always
*/
static int rk3562_can_runtime_suspend(struct device *dev)
{
struct net_device *ndev = dev_get_drvdata(dev);
struct rk3562_can *rcan = netdev_priv(ndev);
clk_bulk_disable_unprepare(rcan->num_clks, rcan->clks);
return 0;
}
/**
* rk3562_can_runtime_resume - Runtime resume from suspend
* @dev: Address of the device structure
*
* Resume operation after suspend.
* Return: 0 on success and failure value on error
*/
static int rk3562_can_runtime_resume(struct device *dev)
{
struct net_device *ndev = dev_get_drvdata(dev);
struct rk3562_can *rcan = netdev_priv(ndev);
int ret;
ret = clk_bulk_prepare_enable(rcan->num_clks, rcan->clks);
if (ret) {
dev_err(dev, "Cannot enable clock.\n");
return ret;
}
return 0;
}
static const struct dev_pm_ops rk3562_can_dev_pm_ops = {
SYSTEM_SLEEP_PM_OPS(rk3562_can_suspend, rk3562_can_resume)
RUNTIME_PM_OPS(rk3562_can_runtime_suspend,
rk3562_can_runtime_resume, NULL)
};
static const struct of_device_id rk3562_can_of_match[] = {
{
.compatible = "rockchip,rk3562-can",
.data = (void *)ROCKCHIP_RK3562_CAN_MODE
},
{
.compatible = "rockchip,rk3562-canfd",
.data = (void *)ROCKCHIP_RK3562_CANFD_MODE
},
{},
};
MODULE_DEVICE_TABLE(of, rk3562_can_of_match);
static int rk3562_can_probe(struct platform_device *pdev)
{
struct net_device *ndev;
struct rk3562_can *rcan;
void __iomem *addr;
int err, irq;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "could not get a valid irq\n");
return -ENODEV;
}
addr = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(addr))
return -EBUSY;
ndev = alloc_candev(sizeof(struct rk3562_can), 1);
if (!ndev) {
dev_err(&pdev->dev, "could not allocate memory for CANFD device\n");
return -ENOMEM;
}
rcan = netdev_priv(ndev);
/* register interrupt handler */
err = devm_request_irq(&pdev->dev, irq, rk3562_can_interrupt,
0, ndev->name, ndev);
if (err) {
dev_err(&pdev->dev, "request_irq err: %d\n", err);
goto err_free_candev;
}
rcan->reset = devm_reset_control_array_get_exclusive(&pdev->dev);
if (IS_ERR(rcan->reset)) {
err = dev_err_probe(&pdev->dev, PTR_ERR(rcan->reset),
"failed to get canfd reset lines\n");
goto err_free_candev;
}
rcan->num_clks = devm_clk_bulk_get_all(&pdev->dev, &rcan->clks);
if (rcan->num_clks < 1) {
err = -ENODEV;
goto err_free_candev;
}
rcan->mode = (uintptr_t)device_get_match_data(&pdev->dev);
rcan->base = addr;
rcan->can.clock.freq = clk_get_rate(rcan->clks[0].clk);
rcan->dev = &pdev->dev;
rcan->can.state = CAN_STATE_STOPPED;
switch (rcan->mode) {
case ROCKCHIP_RK3562_CAN_MODE:
rcan->can.bittiming_const = &rk3562_can_bittiming_const;
rcan->can.do_set_mode = rk3562_can_set_mode;
rcan->can.do_get_berr_counter = rk3562_can_get_berr_counter;
rcan->can.ctrlmode_supported = CAN_CTRLMODE_BERR_REPORTING |
CAN_CTRLMODE_LISTENONLY |
CAN_CTRLMODE_LOOPBACK |
CAN_CTRLMODE_3_SAMPLES;
rcan->rx_fifo_shift = RX_FIFO_CNT2_SHIFT;
rcan->rx_fifo_mask = RX_FIFO_CNT2_MASK;
rcan->rx_fifo_depth = 32;
rcan->rx_max_data = 4;
break;
case ROCKCHIP_RK3562_CANFD_MODE:
rcan->can.bittiming_const = &rk3562_can_bittiming_const;
rcan->can.data_bittiming_const = &rk3562_can_data_bittiming_const;
rcan->can.do_set_mode = rk3562_can_set_mode;
rcan->can.do_get_berr_counter = rk3562_can_get_berr_counter;
rcan->can.do_set_bittiming = rk3562_can_set_bittiming;
rcan->can.do_set_data_bittiming = rk3562_can_set_bittiming;
rcan->can.ctrlmode = CAN_CTRLMODE_FD;
/* IFI CANFD can do both Bosch FD and ISO FD */
rcan->can.ctrlmode_supported = CAN_CTRLMODE_LOOPBACK |
CAN_CTRLMODE_FD;
rcan->rx_fifo_shift = RX_FIFO_CNT2_SHIFT;
rcan->rx_fifo_mask = RX_FIFO_CNT2_MASK;
rcan->rx_fifo_depth = 7;
rcan->rx_max_data = 18;
break;
default:
err = -EINVAL;
goto err_free_candev;
}
ndev->netdev_ops = &rk3562_can_netdev_ops;
ndev->irq = irq;
ndev->flags |= IFF_ECHO;
rcan->can.restart_ms = 1;
platform_set_drvdata(pdev, ndev);
SET_NETDEV_DEV(ndev, &pdev->dev);
pm_runtime_enable(&pdev->dev);
err = pm_runtime_get_sync(&pdev->dev);
if (err < 0) {
dev_err(&pdev->dev, "%s: pm_runtime_get failed(%d)\n",
__func__, err);
goto err_pmdisable;
}
netif_napi_add(ndev, &rcan->napi, rk3562_can_rx_poll);
err = register_candev(ndev);
if (err) {
dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
DRV_NAME, err);
goto err_disableclks;
}
pm_runtime_put(&pdev->dev);
return 0;
err_disableclks:
pm_runtime_put(&pdev->dev);
err_pmdisable:
pm_runtime_disable(&pdev->dev);
err_free_candev:
free_candev(ndev);
return err;
}
static int rk3562_can_remove(struct platform_device *pdev)
{
struct net_device *ndev = platform_get_drvdata(pdev);
struct rk3562_can *rcan = netdev_priv(ndev);
unregister_netdev(ndev);
pm_runtime_disable(&pdev->dev);
netif_napi_del(&rcan->napi);
free_candev(ndev);
return 0;
}
static struct platform_driver rk3562_can_driver = {
.driver = {
.name = DRV_NAME,
.pm = pm_ptr(&rk3562_can_dev_pm_ops),
.of_match_table = rk3562_can_of_match,
},
.probe = rk3562_can_probe,
.remove = rk3562_can_remove,
};
module_platform_driver(rk3562_can_driver);
MODULE_AUTHOR("Elaine Zhang <zhangqing@rock-chips.com>");
MODULE_DESCRIPTION("RK3562 CAN Drivers");
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