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/*
* TI HECC (CAN) device driver
*
* This driver supports TI's HECC (High End CAN Controller module) and the
* specs for the same is available at <http://www.ti.com>
*
* Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* This program is distributed as is WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/regulator/consumer.h>
#include <linux/can/dev.h>
#include <linux/can/error.h>
#include <linux/can/led.h>
#define DRV_NAME "ti_hecc"
#define HECC_MODULE_VERSION "0.7"
MODULE_VERSION(HECC_MODULE_VERSION);
#define DRV_DESC "TI High End CAN Controller Driver " HECC_MODULE_VERSION
/* TX / RX Mailbox Configuration */
#define HECC_MAX_MAILBOXES 32 /* hardware mailboxes - do not change */
#define MAX_TX_PRIO 0x3F /* hardware value - do not change */
/*
* Important Note: TX mailbox configuration
* TX mailboxes should be restricted to the number of SKB buffers to avoid
* maintaining SKB buffers separately. TX mailboxes should be a power of 2
* for the mailbox logic to work. Top mailbox numbers are reserved for RX
* and lower mailboxes for TX.
*
* HECC_MAX_TX_MBOX HECC_MB_TX_SHIFT
* 4 (default) 2
* 8 3
* 16 4
*/
#define HECC_MB_TX_SHIFT 2 /* as per table above */
#define HECC_MAX_TX_MBOX BIT(HECC_MB_TX_SHIFT)
#define HECC_TX_PRIO_SHIFT (HECC_MB_TX_SHIFT)
#define HECC_TX_PRIO_MASK (MAX_TX_PRIO << HECC_MB_TX_SHIFT)
#define HECC_TX_MB_MASK (HECC_MAX_TX_MBOX - 1)
#define HECC_TX_MASK ((HECC_MAX_TX_MBOX - 1) | HECC_TX_PRIO_MASK)
#define HECC_TX_MBOX_MASK (~(BIT(HECC_MAX_TX_MBOX) - 1))
#define HECC_DEF_NAPI_WEIGHT HECC_MAX_RX_MBOX
/*
* Important Note: RX mailbox configuration
* RX mailboxes are further logically split into two - main and buffer
* mailboxes. The goal is to get all packets into main mailboxes as
* driven by mailbox number and receive priority (higher to lower) and
* buffer mailboxes are used to receive pkts while main mailboxes are being
* processed. This ensures in-order packet reception.
*
* Here are the recommended values for buffer mailbox. Note that RX mailboxes
* start after TX mailboxes:
*
* HECC_MAX_RX_MBOX HECC_RX_BUFFER_MBOX No of buffer mailboxes
* 28 12 8
* 16 20 4
*/
#define HECC_MAX_RX_MBOX (HECC_MAX_MAILBOXES - HECC_MAX_TX_MBOX)
#define HECC_RX_BUFFER_MBOX 12 /* as per table above */
#define HECC_RX_FIRST_MBOX (HECC_MAX_MAILBOXES - 1)
#define HECC_RX_HIGH_MBOX_MASK (~(BIT(HECC_RX_BUFFER_MBOX) - 1))
/* TI HECC module registers */
#define HECC_CANME 0x0 /* Mailbox enable */
#define HECC_CANMD 0x4 /* Mailbox direction */
#define HECC_CANTRS 0x8 /* Transmit request set */
#define HECC_CANTRR 0xC /* Transmit request */
#define HECC_CANTA 0x10 /* Transmission acknowledge */
#define HECC_CANAA 0x14 /* Abort acknowledge */
#define HECC_CANRMP 0x18 /* Receive message pending */
#define HECC_CANRML 0x1C /* Remote message lost */
#define HECC_CANRFP 0x20 /* Remote frame pending */
#define HECC_CANGAM 0x24 /* SECC only:Global acceptance mask */
#define HECC_CANMC 0x28 /* Master control */
#define HECC_CANBTC 0x2C /* Bit timing configuration */
#define HECC_CANES 0x30 /* Error and status */
#define HECC_CANTEC 0x34 /* Transmit error counter */
#define HECC_CANREC 0x38 /* Receive error counter */
#define HECC_CANGIF0 0x3C /* Global interrupt flag 0 */
#define HECC_CANGIM 0x40 /* Global interrupt mask */
#define HECC_CANGIF1 0x44 /* Global interrupt flag 1 */
#define HECC_CANMIM 0x48 /* Mailbox interrupt mask */
#define HECC_CANMIL 0x4C /* Mailbox interrupt level */
#define HECC_CANOPC 0x50 /* Overwrite protection control */
#define HECC_CANTIOC 0x54 /* Transmit I/O control */
#define HECC_CANRIOC 0x58 /* Receive I/O control */
#define HECC_CANLNT 0x5C /* HECC only: Local network time */
#define HECC_CANTOC 0x60 /* HECC only: Time-out control */
#define HECC_CANTOS 0x64 /* HECC only: Time-out status */
#define HECC_CANTIOCE 0x68 /* SCC only:Enhanced TX I/O control */
#define HECC_CANRIOCE 0x6C /* SCC only:Enhanced RX I/O control */
/* Mailbox registers */
#define HECC_CANMID 0x0
#define HECC_CANMCF 0x4
#define HECC_CANMDL 0x8
#define HECC_CANMDH 0xC
#define HECC_SET_REG 0xFFFFFFFF
#define HECC_CANID_MASK 0x3FF /* 18 bits mask for extended id's */
#define HECC_CCE_WAIT_COUNT 100 /* Wait for ~1 sec for CCE bit */
#define HECC_CANMC_SCM BIT(13) /* SCC compat mode */
#define HECC_CANMC_CCR BIT(12) /* Change config request */
#define HECC_CANMC_PDR BIT(11) /* Local Power down - for sleep mode */
#define HECC_CANMC_ABO BIT(7) /* Auto Bus On */
#define HECC_CANMC_STM BIT(6) /* Self test mode - loopback */
#define HECC_CANMC_SRES BIT(5) /* Software reset */
#define HECC_CANTIOC_EN BIT(3) /* Enable CAN TX I/O pin */
#define HECC_CANRIOC_EN BIT(3) /* Enable CAN RX I/O pin */
#define HECC_CANMID_IDE BIT(31) /* Extended frame format */
#define HECC_CANMID_AME BIT(30) /* Acceptance mask enable */
#define HECC_CANMID_AAM BIT(29) /* Auto answer mode */
#define HECC_CANES_FE BIT(24) /* form error */
#define HECC_CANES_BE BIT(23) /* bit error */
#define HECC_CANES_SA1 BIT(22) /* stuck at dominant error */
#define HECC_CANES_CRCE BIT(21) /* CRC error */
#define HECC_CANES_SE BIT(20) /* stuff bit error */
#define HECC_CANES_ACKE BIT(19) /* ack error */
#define HECC_CANES_BO BIT(18) /* Bus off status */
#define HECC_CANES_EP BIT(17) /* Error passive status */
#define HECC_CANES_EW BIT(16) /* Error warning status */
#define HECC_CANES_SMA BIT(5) /* suspend mode ack */
#define HECC_CANES_CCE BIT(4) /* Change config enabled */
#define HECC_CANES_PDA BIT(3) /* Power down mode ack */
#define HECC_CANBTC_SAM BIT(7) /* sample points */
#define HECC_BUS_ERROR (HECC_CANES_FE | HECC_CANES_BE |\
HECC_CANES_CRCE | HECC_CANES_SE |\
HECC_CANES_ACKE)
#define HECC_CANMCF_RTR BIT(4) /* Remote transmit request */
#define HECC_CANGIF_MAIF BIT(17) /* Message alarm interrupt */
#define HECC_CANGIF_TCOIF BIT(16) /* Timer counter overflow int */
#define HECC_CANGIF_GMIF BIT(15) /* Global mailbox interrupt */
#define HECC_CANGIF_AAIF BIT(14) /* Abort ack interrupt */
#define HECC_CANGIF_WDIF BIT(13) /* Write denied interrupt */
#define HECC_CANGIF_WUIF BIT(12) /* Wake up interrupt */
#define HECC_CANGIF_RMLIF BIT(11) /* Receive message lost interrupt */
#define HECC_CANGIF_BOIF BIT(10) /* Bus off interrupt */
#define HECC_CANGIF_EPIF BIT(9) /* Error passive interrupt */
#define HECC_CANGIF_WLIF BIT(8) /* Warning level interrupt */
#define HECC_CANGIF_MBOX_MASK 0x1F /* Mailbox number mask */
#define HECC_CANGIM_I1EN BIT(1) /* Int line 1 enable */
#define HECC_CANGIM_I0EN BIT(0) /* Int line 0 enable */
#define HECC_CANGIM_DEF_MASK 0x700 /* only busoff/warning/passive */
#define HECC_CANGIM_SIL BIT(2) /* system interrupts to int line 1 */
/* CAN Bittiming constants as per HECC specs */
static const struct can_bittiming_const ti_hecc_bittiming_const = {
.name = DRV_NAME,
.tseg1_min = 1,
.tseg1_max = 16,
.tseg2_min = 1,
.tseg2_max = 8,
.sjw_max = 4,
.brp_min = 1,
.brp_max = 256,
.brp_inc = 1,
};
struct ti_hecc_priv {
struct can_priv can; /* MUST be first member/field */
struct napi_struct napi;
struct net_device *ndev;
struct clk *clk;
void __iomem *base;
void __iomem *hecc_ram;
void __iomem *mbx;
bool use_hecc1int;
spinlock_t mbx_lock; /* CANME register needs protection */
u32 tx_head;
u32 tx_tail;
u32 rx_next;
struct regulator *reg_xceiver;
};
static inline int get_tx_head_mb(struct ti_hecc_priv *priv)
{
return priv->tx_head & HECC_TX_MB_MASK;
}
static inline int get_tx_tail_mb(struct ti_hecc_priv *priv)
{
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