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Fixed MTP to work with TWRP

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awab228 2018-06-19 23:16:04 +02:00
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21
drivers/net/can/cc770/Kconfig Normal file
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menuconfig CAN_CC770
tristate "Bosch CC770 and Intel AN82527 devices"
depends on HAS_IOMEM
if CAN_CC770
config CAN_CC770_ISA
tristate "ISA Bus based legacy CC770 driver"
---help---
This driver adds legacy support for CC770 and AN82527 chips
connected to the ISA bus using I/O port, memory mapped or
indirect access.
config CAN_CC770_PLATFORM
tristate "Generic Platform Bus based CC770 driver"
---help---
This driver adds support for the CC770 and AN82527 chips
connected to the "platform bus" (Linux abstraction for directly
to the processor attached devices).
endif

7
drivers/net/can/cc770/Makefile Normal file
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#
# Makefile for the Bosch CC770 CAN controller drivers.
#
obj-$(CONFIG_CAN_CC770) += cc770.o
obj-$(CONFIG_CAN_CC770_ISA) += cc770_isa.o
obj-$(CONFIG_CAN_CC770_PLATFORM) += cc770_platform.o

883
drivers/net/can/cc770/cc770.c Normal file
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/*
* Core driver for the CC770 and AN82527 CAN controllers
*
* Copyright (C) 2009, 2011 Wolfgang Grandegger <wg@grandegger.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the version 2 of the GNU General Public 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.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/delay.h>
#include <linux/can.h>
#include <linux/can/dev.h>
#include <linux/can/error.h>
#include <linux/can/platform/cc770.h>
#include "cc770.h"
MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION(KBUILD_MODNAME "CAN netdevice driver");
/*
* The CC770 is a CAN controller from Bosch, which is 100% compatible
* with the AN82527 from Intel, but with "bugs" being fixed and some
* additional functionality, mainly:
*
* 1. RX and TX error counters are readable.
* 2. Support of silent (listen-only) mode.
* 3. Message object 15 can receive all types of frames, also RTR and EFF.
*
* Details are available from Bosch's "CC770_Product_Info_2007-01.pdf",
* which explains in detail the compatibility between the CC770 and the
* 82527. This driver use the additional functionality 3. on real CC770
* devices. Unfortunately, the CC770 does still not store the message
* identifier of received remote transmission request frames and
* therefore it's set to 0.
*
* The message objects 1..14 can be used for TX and RX while the message
* objects 15 is optimized for RX. It has a shadow register for reliable
* data receiption under heavy bus load. Therefore it makes sense to use
* this message object for the needed use case. The frame type (EFF/SFF)
* for the message object 15 can be defined via kernel module parameter
* "msgobj15_eff". If not equal 0, it will receive 29-bit EFF frames,
* otherwise 11 bit SFF messages.
*/
static int msgobj15_eff;
module_param(msgobj15_eff, int, S_IRUGO);
MODULE_PARM_DESC(msgobj15_eff, "Extended 29-bit frames for message object 15 "
"(default: 11-bit standard frames)");
static int i82527_compat;
module_param(i82527_compat, int, S_IRUGO);
MODULE_PARM_DESC(i82527_compat, "Strict Intel 82527 comptibility mode "
"without using additional functions");
/*
* This driver uses the last 5 message objects 11..15. The definitions
* and structure below allows to configure and assign them to the real
* message object.
*/
static unsigned char cc770_obj_flags[CC770_OBJ_MAX] = {
[CC770_OBJ_RX0] = CC770_OBJ_FLAG_RX,
[CC770_OBJ_RX1] = CC770_OBJ_FLAG_RX | CC770_OBJ_FLAG_EFF,
[CC770_OBJ_RX_RTR0] = CC770_OBJ_FLAG_RX | CC770_OBJ_FLAG_RTR,
[CC770_OBJ_RX_RTR1] = CC770_OBJ_FLAG_RX | CC770_OBJ_FLAG_RTR |
CC770_OBJ_FLAG_EFF,
[CC770_OBJ_TX] = 0,
};
static const struct can_bittiming_const cc770_bittiming_const = {
.name = KBUILD_MODNAME,
.tseg1_min = 1,
.tseg1_max = 16,
.tseg2_min = 1,
.tseg2_max = 8,
.sjw_max = 4,
.brp_min = 1,
.brp_max = 64,
.brp_inc = 1,
};
static inline int intid2obj(unsigned int intid)
{
if (intid == 2)
return 0;
else
return MSGOBJ_LAST + 2 - intid;
}
static void enable_all_objs(const struct net_device *dev)
{
struct cc770_priv *priv = netdev_priv(dev);
u8 msgcfg;
unsigned char obj_flags;
unsigned int o, mo;
for (o = 0; o < ARRAY_SIZE(priv->obj_flags); o++) {
obj_flags = priv->obj_flags[o];
mo = obj2msgobj(o);
if (obj_flags & CC770_OBJ_FLAG_RX) {
/*
* We don't need extra objects for RTR and EFF if
* the additional CC770 functions are enabled.
*/
if (priv->control_normal_mode & CTRL_EAF) {
if (o > 0)
continue;
netdev_dbg(dev, "Message object %d for "
"RX data, RTR, SFF and EFF\n", mo);
} else {
netdev_dbg(dev,
"Message object %d for RX %s %s\n",
mo, obj_flags & CC770_OBJ_FLAG_RTR ?
"RTR" : "data",
obj_flags & CC770_OBJ_FLAG_EFF ?
"EFF" : "SFF");
}
if (obj_flags & CC770_OBJ_FLAG_EFF)
msgcfg = MSGCFG_XTD;
else
msgcfg = 0;
if (obj_flags & CC770_OBJ_FLAG_RTR)
msgcfg |= MSGCFG_DIR;
cc770_write_reg(priv, msgobj[mo].config, msgcfg);
cc770_write_reg(priv, msgobj[mo].ctrl0,
MSGVAL_SET | TXIE_RES |
RXIE_SET | INTPND_RES);
if (obj_flags & CC770_OBJ_FLAG_RTR)
cc770_write_reg(priv, msgobj[mo].ctrl1,
NEWDAT_RES | CPUUPD_SET |
TXRQST_RES | RMTPND_RES);
else
cc770_write_reg(priv, msgobj[mo].ctrl1,
NEWDAT_RES | MSGLST_RES |
TXRQST_RES | RMTPND_RES);
} else {
netdev_dbg(dev, "Message object %d for "
"TX data, RTR, SFF and EFF\n", mo);
cc770_write_reg(priv, msgobj[mo].ctrl1,
RMTPND_RES | TXRQST_RES |
CPUUPD_RES | NEWDAT_RES);
cc770_write_reg(priv, msgobj[mo].ctrl0,
MSGVAL_RES | TXIE_RES |
RXIE_RES | INTPND_RES);
}
}
}
static void disable_all_objs(const struct cc770_priv *priv)
{
int o, mo;
for (o = 0; o < ARRAY_SIZE(priv->obj_flags); o++) {
mo = obj2msgobj(o);
if (priv->obj_flags[o] & CC770_OBJ_FLAG_RX) {
if (o > 0 && priv->control_normal_mode & CTRL_EAF)
continue;
cc770_write_reg(priv, msgobj[mo].ctrl1,
NEWDAT_RES | MSGLST_RES |
TXRQST_RES | RMTPND_RES);
cc770_write_reg(priv, msgobj[mo].ctrl0,
MSGVAL_RES | TXIE_RES |
RXIE_RES | INTPND_RES);
} else {
/* Clear message object for send */
cc770_write_reg(priv, msgobj[mo].ctrl1,
RMTPND_RES | TXRQST_RES |
CPUUPD_RES | NEWDAT_RES);
cc770_write_reg(priv, msgobj[mo].ctrl0,
MSGVAL_RES | TXIE_RES |
RXIE_RES | INTPND_RES);
}
}
}
static void set_reset_mode(struct net_device *dev)
{
struct cc770_priv *priv = netdev_priv(dev);
/* Enable configuration and puts chip in bus-off, disable interrupts */
cc770_write_reg(priv, control, CTRL_CCE | CTRL_INI);
priv->can.state = CAN_STATE_STOPPED;
/* Clear interrupts */
cc770_read_reg(priv, interrupt);
/* Clear status register */
cc770_write_reg(priv, status, 0);
/* Disable all used message objects */
disable_all_objs(priv);
}
static void set_normal_mode(struct net_device *dev)
{
struct cc770_priv *priv = netdev_priv(dev);
/* Clear interrupts */
cc770_read_reg(priv, interrupt);
/* Clear status register and pre-set last error code */
cc770_write_reg(priv, status, STAT_LEC_MASK);
/* Enable all used message objects*/
enable_all_objs(dev);
/*
* Clear bus-off, interrupts only for errors,
* not for status change
*/
cc770_write_reg(priv, control, priv->control_normal_mode);
priv->can.state = CAN_STATE_ERROR_ACTIVE;
}
static void chipset_init(struct cc770_priv *priv)
{
int mo, id, data;
/* Enable configuration and put chip in bus-off, disable interrupts */
cc770_write_reg(priv, control, (CTRL_CCE | CTRL_INI));
/* Set CLKOUT divider and slew rates */
cc770_write_reg(priv, clkout, priv->clkout);
/* Configure CPU interface / CLKOUT enable */
cc770_write_reg(priv, cpu_interface, priv->cpu_interface);
/* Set bus configuration */
cc770_write_reg(priv, bus_config, priv->bus_config);
/* Clear interrupts */
cc770_read_reg(priv, interrupt);
/* Clear status register */
cc770_write_reg(priv, status, 0);
/* Clear and invalidate message objects */
for (mo = MSGOBJ_FIRST; mo <= MSGOBJ_LAST; mo++) {
cc770_write_reg(priv, msgobj[mo].ctrl0,
INTPND_UNC | RXIE_RES |
TXIE_RES | MSGVAL_RES);
cc770_write_reg(priv, msgobj[mo].ctrl0,
INTPND_RES | RXIE_RES |
TXIE_RES | MSGVAL_RES);
cc770_write_reg(priv, msgobj[mo].ctrl1,
NEWDAT_RES | MSGLST_RES |
TXRQST_RES | RMTPND_RES);
for (data = 0; data < 8; data++)
cc770_write_reg(priv, msgobj[mo].data[data], 0);
for (id = 0; id < 4; id++)
cc770_write_reg(priv, msgobj[mo].id[id], 0);
cc770_write_reg(priv, msgobj[mo].config, 0);
}
/* Set all global ID masks to "don't care" */
cc770_write_reg(priv, global_mask_std[0], 0);
cc770_write_reg(priv, global_mask_std[1], 0);
cc770_write_reg(priv, global_mask_ext[0], 0);
cc770_write_reg(priv, global_mask_ext[1], 0);
cc770_write_reg(priv, global_mask_ext[2], 0);
cc770_write_reg(priv, global_mask_ext[3], 0);
}
static int cc770_probe_chip(struct net_device *dev)
{
struct cc770_priv *priv = netdev_priv(dev);
/* Enable configuration, put chip in bus-off, disable ints */
cc770_write_reg(priv, control, CTRL_CCE | CTRL_EAF | CTRL_INI);
/* Configure cpu interface / CLKOUT disable */
cc770_write_reg(priv, cpu_interface, priv->cpu_interface);
/*
* Check if hardware reset is still inactive or maybe there
* is no chip in this address space
*/
if (cc770_read_reg(priv, cpu_interface) & CPUIF_RST) {
netdev_info(dev, "probing @0x%p failed (reset)\n",
priv->reg_base);
return -ENODEV;
}
/* Write and read back test pattern (some arbitrary values) */
cc770_write_reg(priv, msgobj[1].data[1], 0x25);
cc770_write_reg(priv, msgobj[2].data[3], 0x52);
cc770_write_reg(priv, msgobj[10].data[6], 0xc3);
if ((cc770_read_reg(priv, msgobj[1].data[1]) != 0x25) ||
(cc770_read_reg(priv, msgobj[2].data[3]) != 0x52) ||
(cc770_read_reg(priv, msgobj[10].data[6]) != 0xc3)) {
netdev_info(dev, "probing @0x%p failed (pattern)\n",
priv->reg_base);
return -ENODEV;
}
/* Check if this chip is a CC770 supporting additional functions */
if (cc770_read_reg(priv, control) & CTRL_EAF)
priv->control_normal_mode |= CTRL_EAF;
return 0;
}
static void cc770_start(struct net_device *dev)
{
struct cc770_priv *priv = netdev_priv(dev);
/* leave reset mode */
if (priv->can.state != CAN_STATE_STOPPED)
set_reset_mode(dev);
/* leave reset mode */
set_normal_mode(dev);
}
static int cc770_set_mode(struct net_device *dev, enum can_mode mode)
{
switch (mode) {
case CAN_MODE_START:
cc770_start(dev);
netif_wake_queue(dev);
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
static int cc770_set_bittiming(struct net_device *dev)
{
struct cc770_priv *priv = netdev_priv(dev);
struct can_bittiming *bt = &priv->can.bittiming;
u8 btr0, btr1;
btr0 = ((bt->brp - 1) & 0x3f) | (((bt->sjw - 1) & 0x3) << 6);
btr1 = ((bt->prop_seg + bt->phase_seg1 - 1) & 0xf) |
(((bt->phase_seg2 - 1) & 0x7) << 4);
if (priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES)
btr1 |= 0x80;
netdev_info(dev, "setting BTR0=0x%02x BTR1=0x%02x\n", btr0, btr1);
cc770_write_reg(priv, bit_timing_0, btr0);
cc770_write_reg(priv, bit_timing_1, btr1);
return 0;
}
static int cc770_get_berr_counter(const struct net_device *dev,
struct can_berr_counter *bec)
{
struct cc770_priv *priv = netdev_priv(dev);
bec->txerr = cc770_read_reg(priv, tx_error_counter);
bec->rxerr = cc770_read_reg(priv, rx_error_counter);
return 0;
}
static netdev_tx_t cc770_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct cc770_priv *priv = netdev_priv(dev);
struct net_device_stats *stats = &dev->stats;
struct can_frame *cf = (struct can_frame *)skb->data;
unsigned int mo = obj2msgobj(CC770_OBJ_TX);
u8 dlc, rtr;
u32 id;
int i;
if (can_dropped_invalid_skb(dev, skb))
return NETDEV_TX_OK;
if ((cc770_read_reg(priv,
msgobj[mo].ctrl1) & TXRQST_UNC) == TXRQST_SET) {
netdev_err(dev, "TX register is still occupied!\n");
return NETDEV_TX_BUSY;
}
netif_stop_queue(dev);
dlc = cf->can_dlc;
id = cf->can_id;
if (cf->can_id & CAN_RTR_FLAG)
rtr = 0;
else
rtr = MSGCFG_DIR;
cc770_write_reg(priv, msgobj[mo].ctrl1,
RMTPND_RES | TXRQST_RES | CPUUPD_SET | NEWDAT_RES);
cc770_write_reg(priv, msgobj[mo].ctrl0,
MSGVAL_SET | TXIE_SET | RXIE_RES | INTPND_RES);
if (id & CAN_EFF_FLAG) {
id &= CAN_EFF_MASK;
cc770_write_reg(priv, msgobj[mo].config,
(dlc << 4) | rtr | MSGCFG_XTD);
cc770_write_reg(priv, msgobj[mo].id[3], id << 3);
cc770_write_reg(priv, msgobj[mo].id[2], id >> 5);
cc770_write_reg(priv, msgobj[mo].id[1], id >> 13);
cc770_write_reg(priv, msgobj[mo].id[0], id >> 21);
} else {
id &= CAN_SFF_MASK;
cc770_write_reg(priv, msgobj[mo].config, (dlc << 4) | rtr);
cc770_write_reg(priv, msgobj[mo].id[0], id >> 3);
cc770_write_reg(priv, msgobj[mo].id[1], id << 5);
}
for (i = 0; i < dlc; i++)
cc770_write_reg(priv, msgobj[mo].data[i], cf->data[i]);
/* Store echo skb before starting the transfer */
can_put_echo_skb(skb, dev, 0);
cc770_write_reg(priv, msgobj[mo].ctrl1,
RMTPND_RES | TXRQST_SET | CPUUPD_RES | NEWDAT_UNC);
stats->tx_bytes += dlc;
/*
* HM: We had some cases of repeated IRQs so make sure the
* INT is acknowledged I know it's already further up, but
* doing again fixed the issue
*/
cc770_write_reg(priv, msgobj[mo].ctrl0,
MSGVAL_UNC | TXIE_UNC | RXIE_UNC | INTPND_RES);
return NETDEV_TX_OK;
}
static void cc770_rx(struct net_device *dev, unsigned int mo, u8 ctrl1)
{
struct cc770_priv *priv = netdev_priv(dev);
struct net_device_stats *stats = &dev->stats;
struct can_frame *cf;
struct sk_buff *skb;
u8 config;
u32 id;
int i;
skb = alloc_can_skb(dev, &cf);
if (!skb)
return;
config = cc770_read_reg(priv, msgobj[mo].config);
if (ctrl1 & RMTPND_SET) {
/*
* Unfortunately, the chip does not store the real message
* identifier of the received remote transmission request
* frame. Therefore we set it to 0.
*/
cf->can_id = CAN_RTR_FLAG;
if (config & MSGCFG_XTD)
cf->can_id |= CAN_EFF_FLAG;
cf->can_dlc = 0;
} else {
if (config & MSGCFG_XTD) {
id = cc770_read_reg(priv, msgobj[mo].id[3]);
id |= cc770_read_reg(priv, msgobj[mo].id[2]) << 8;
id |= cc770_read_reg(priv, msgobj[mo].id[1]) << 16;
id |= cc770_read_reg(priv, msgobj[mo].id[0]) << 24;
id >>= 3;
id |= CAN_EFF_FLAG;
} else {
id = cc770_read_reg(priv, msgobj[mo].id[1]);
id |= cc770_read_reg(priv, msgobj[mo].id[0]) << 8;
id >>= 5;
}
cf->can_id = id;
cf->can_dlc = get_can_dlc((config & 0xf0) >> 4);
for (i = 0; i < cf->can_dlc; i++)
cf->data[i] = cc770_read_reg(priv, msgobj[mo].data[i]);
}
netif_rx(skb);
stats->rx_packets++;
stats->rx_bytes += cf->can_dlc;
}
static int cc770_err(struct net_device *dev, u8 status)
{
struct cc770_priv *priv = netdev_priv(dev);
struct net_device_stats *stats = &dev->stats;
struct can_frame *cf;
struct sk_buff *skb;
u8 lec;
netdev_dbg(dev, "status interrupt (%#x)\n", status);
skb = alloc_can_err_skb(dev, &cf);
if (!skb)
return -ENOMEM;
/* Use extended functions of the CC770 */
if (priv->control_normal_mode & CTRL_EAF) {
cf->data[6] = cc770_read_reg(priv, tx_error_counter);
cf->data[7] = cc770_read_reg(priv, rx_error_counter);
}
if (status & STAT_BOFF) {
/* Disable interrupts */
cc770_write_reg(priv, control, CTRL_INI);
cf->can_id |= CAN_ERR_BUSOFF;
priv->can.state = CAN_STATE_BUS_OFF;
can_bus_off(dev);
} else if (status & STAT_WARN) {
cf->can_id |= CAN_ERR_CRTL;
/* Only the CC770 does show error passive */
if (cf->data[7] > 127) {
cf->data[1] = CAN_ERR_CRTL_RX_PASSIVE |
CAN_ERR_CRTL_TX_PASSIVE;
priv->can.state = CAN_STATE_ERROR_PASSIVE;
priv->can.can_stats.error_passive++;
} else {
cf->data[1] = CAN_ERR_CRTL_RX_WARNING |
CAN_ERR_CRTL_TX_WARNING;
priv->can.state = CAN_STATE_ERROR_WARNING;
priv->can.can_stats.error_warning++;
}
} else {
/* Back to error avtive */
cf->can_id |= CAN_ERR_PROT;
cf->data[2] = CAN_ERR_PROT_ACTIVE;
priv->can.state = CAN_STATE_ERROR_ACTIVE;
}
lec = status & STAT_LEC_MASK;
if (lec < 7 && lec > 0) {
if (lec == STAT_LEC_ACK) {
cf->can_id |= CAN_ERR_ACK;
} else {
cf->can_id |= CAN_ERR_PROT;
switch (lec) {
case STAT_LEC_STUFF:
cf->data[2] |= CAN_ERR_PROT_STUFF;
break;
case STAT_LEC_FORM:
cf->data[2] |= CAN_ERR_PROT_FORM;
break;
case STAT_LEC_BIT1:
cf->data[2] |= CAN_ERR_PROT_BIT1;
break;
case STAT_LEC_BIT0:
cf->data[2] |= CAN_ERR_PROT_BIT0;
break;
case STAT_LEC_CRC:
cf->data[3] |= CAN_ERR_PROT_LOC_CRC_SEQ;
break;
}
}
}
netif_rx(skb);
stats->rx_packets++;
stats->rx_bytes += cf->can_dlc;
return 0;
}
static int cc770_status_interrupt(struct net_device *dev)
{
struct cc770_priv *priv = netdev_priv(dev);
u8 status;
status = cc770_read_reg(priv, status);
/* Reset the status register including RXOK and TXOK */
cc770_write_reg(priv, status, STAT_LEC_MASK);
if (status & (STAT_WARN | STAT_BOFF) ||
(status & STAT_LEC_MASK) != STAT_LEC_MASK) {
cc770_err(dev, status);
return status & STAT_BOFF;
}
return 0;
}
static void cc770_rx_interrupt(struct net_device *dev, unsigned int o)
{
struct cc770_priv *priv = netdev_priv(dev);
struct net_device_stats *stats = &dev->stats;
unsigned int mo = obj2msgobj(o);
u8 ctrl1;
int n = CC770_MAX_MSG;
while (n--) {
ctrl1 = cc770_read_reg(priv, msgobj[mo].ctrl1);
if (!(ctrl1 & NEWDAT_SET)) {
/* Check for RTR if additional functions are enabled */
if (priv->control_normal_mode & CTRL_EAF) {
if (!(cc770_read_reg(priv, msgobj[mo].ctrl0) &
INTPND_SET))
break;
} else {
break;
}
}
if (ctrl1 & MSGLST_SET) {
stats->rx_over_errors++;
stats->rx_errors++;
}
if (mo < MSGOBJ_LAST)
cc770_write_reg(priv, msgobj[mo].ctrl1,
NEWDAT_RES | MSGLST_RES |
TXRQST_UNC | RMTPND_UNC);
cc770_rx(dev, mo, ctrl1);
cc770_write_reg(priv, msgobj[mo].ctrl0,
MSGVAL_SET | TXIE_RES |
RXIE_SET | INTPND_RES);
cc770_write_reg(priv, msgobj[mo].ctrl1,
NEWDAT_RES | MSGLST_RES |
TXRQST_RES | RMTPND_RES);
}
}
static void cc770_rtr_interrupt(struct net_device *dev, unsigned int o)
{
struct cc770_priv *priv = netdev_priv(dev);
unsigned int mo = obj2msgobj(o);
u8 ctrl0, ctrl1;
int n = CC770_MAX_MSG;
while (n--) {
ctrl0 = cc770_read_reg(priv, msgobj[mo].ctrl0);
if (!(ctrl0 & INTPND_SET))
break;
ctrl1 = cc770_read_reg(priv, msgobj[mo].ctrl1);
cc770_rx(dev, mo, ctrl1);
cc770_write_reg(priv, msgobj[mo].ctrl0,
MSGVAL_SET | TXIE_RES |
RXIE_SET | INTPND_RES);
cc770_write_reg(priv, msgobj[mo].ctrl1,
NEWDAT_RES | CPUUPD_SET |
TXRQST_RES | RMTPND_RES);
}
}
static void cc770_tx_interrupt(struct net_device *dev, unsigned int o)
{
struct cc770_priv *priv = netdev_priv(dev);
struct net_device_stats *stats = &dev->stats;
unsigned int mo = obj2msgobj(o);
/* Nothing more to send, switch off interrupts */
cc770_write_reg(priv, msgobj[mo].ctrl0,
MSGVAL_RES | TXIE_RES | RXIE_RES | INTPND_RES);
/*
* We had some cases of repeated IRQ so make sure the
* INT is acknowledged
*/
cc770_write_reg(priv, msgobj[mo].ctrl0,
MSGVAL_UNC | TXIE_UNC | RXIE_UNC | INTPND_RES);
stats->tx_packets++;
can_get_echo_skb(dev, 0);
netif_wake_queue(dev);
}
static irqreturn_t cc770_interrupt(int irq, void *dev_id)
{
struct net_device *dev = (struct net_device *)dev_id;
struct cc770_priv *priv = netdev_priv(dev);
u8 intid;
int o, n = 0;
/* Shared interrupts and IRQ off? */
if (priv->can.state == CAN_STATE_STOPPED)
return IRQ_NONE;
if (priv->pre_irq)
priv->pre_irq(priv);
while (n < CC770_MAX_IRQ) {
/* Read the highest pending interrupt request */
intid = cc770_read_reg(priv, interrupt);
if (!intid)
break;
n++;
if (intid == 1) {
/* Exit in case of bus-off */
if (cc770_status_interrupt(dev))
break;
} else {
o = intid2obj(intid);
if (o >= CC770_OBJ_MAX) {
netdev_err(dev, "Unexpected interrupt id %d\n",
intid);
continue;
}
if (priv->obj_flags[o] & CC770_OBJ_FLAG_RTR)
cc770_rtr_interrupt(dev, o);
else if (priv->obj_flags[o] & CC770_OBJ_FLAG_RX)
cc770_rx_interrupt(dev, o);
else
cc770_tx_interrupt(dev, o);
}
}
if (priv->post_irq)
priv->post_irq(priv);
if (n >= CC770_MAX_IRQ)
netdev_dbg(dev, "%d messages handled in ISR", n);
return (n) ? IRQ_HANDLED : IRQ_NONE;
}
static int cc770_open(struct net_device *dev)
{
struct cc770_priv *priv = netdev_priv(dev);
int err;
/* set chip into reset mode */
set_reset_mode(dev);
/* common open */
err = open_candev(dev);
if (err)
return err;
err = request_irq(dev->irq, &cc770_interrupt, priv->irq_flags,
dev->name, dev);
if (err) {
close_candev(dev);
return -EAGAIN;
}
/* init and start chip */
cc770_start(dev);
netif_start_queue(dev);
return 0;
}
static int cc770_close(struct net_device *dev)
{
netif_stop_queue(dev);
set_reset_mode(dev);
free_irq(dev->irq, dev);
close_candev(dev);
return 0;
}
struct net_device *alloc_cc770dev(int sizeof_priv)
{
struct net_device *dev;
struct cc770_priv *priv;
dev = alloc_candev(sizeof(struct cc770_priv) + sizeof_priv,
CC770_ECHO_SKB_MAX);
if (!dev)
return NULL;
priv = netdev_priv(dev);
priv->dev = dev;
priv->can.bittiming_const = &cc770_bittiming_const;
priv->can.do_set_bittiming = cc770_set_bittiming;
priv->can.do_set_mode = cc770_set_mode;
priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
memcpy(priv->obj_flags, cc770_obj_flags, sizeof(cc770_obj_flags));
if (sizeof_priv)
priv->priv = (void *)priv + sizeof(struct cc770_priv);
return dev;
}
EXPORT_SYMBOL_GPL(alloc_cc770dev);
void free_cc770dev(struct net_device *dev)
{
free_candev(dev);
}
EXPORT_SYMBOL_GPL(free_cc770dev);
static const struct net_device_ops cc770_netdev_ops = {
.ndo_open = cc770_open,
.ndo_stop = cc770_close,
.ndo_start_xmit = cc770_start_xmit,
.ndo_change_mtu = can_change_mtu,
};
int register_cc770dev(struct net_device *dev)
{
struct cc770_priv *priv = netdev_priv(dev);
int err;
err = cc770_probe_chip(dev);
if (err)
return err;
dev->netdev_ops = &cc770_netdev_ops;
dev->flags |= IFF_ECHO; /* we support local echo */
/* Should we use additional functions? */
if (!i82527_compat && priv->control_normal_mode & CTRL_EAF) {
priv->can.do_get_berr_counter = cc770_get_berr_counter;
priv->control_normal_mode = CTRL_IE | CTRL_EAF | CTRL_EIE;
netdev_dbg(dev, "i82527 mode with additional functions\n");
} else {
priv->control_normal_mode = CTRL_IE | CTRL_EIE;
netdev_dbg(dev, "strict i82527 compatibility mode\n");
}
chipset_init(priv);
set_reset_mode(dev);
return register_candev(dev);
}
EXPORT_SYMBOL_GPL(register_cc770dev);
void unregister_cc770dev(struct net_device *dev)
{
set_reset_mode(dev);
unregister_candev(dev);
}
EXPORT_SYMBOL_GPL(unregister_cc770dev);
static __init int cc770_init(void)
{
if (msgobj15_eff) {
cc770_obj_flags[CC770_OBJ_RX0] |= CC770_OBJ_FLAG_EFF;
cc770_obj_flags[CC770_OBJ_RX1] &= ~CC770_OBJ_FLAG_EFF;
}
pr_info("CAN netdevice driver\n");
return 0;
}
module_init(cc770_init);
static __exit void cc770_exit(void)
{
pr_info("driver removed\n");
}
module_exit(cc770_exit);

203
drivers/net/can/cc770/cc770.h Normal file
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/*
* Core driver for the CC770 and AN82527 CAN controllers
*
* Copyright (C) 2009, 2011 Wolfgang Grandegger <wg@grandegger.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the version 2 of the GNU General Public 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.
*/
#ifndef CC770_DEV_H
#define CC770_DEV_H
#include <linux/can/dev.h>
struct cc770_msgobj {
u8 ctrl0;
u8 ctrl1;
u8 id[4];
u8 config;
u8 data[8];
u8 dontuse; /* padding */
} __packed;
struct cc770_regs {
union {
struct cc770_msgobj msgobj[16]; /* Message object 1..15 */
struct {
u8 control; /* Control Register */
u8 status; /* Status Register */
u8 cpu_interface; /* CPU Interface Register */
u8 dontuse1;
u8 high_speed_read[2]; /* High Speed Read */
u8 global_mask_std[2]; /* Standard Global Mask */
u8 global_mask_ext[4]; /* Extended Global Mask */
u8 msg15_mask[4]; /* Message 15 Mask */
u8 dontuse2[15];
u8 clkout; /* Clock Out Register */
u8 dontuse3[15];
u8 bus_config; /* Bus Configuration Register */
u8 dontuse4[15];
u8 bit_timing_0; /* Bit Timing Register byte 0 */
u8 dontuse5[15];
u8 bit_timing_1; /* Bit Timing Register byte 1 */
u8 dontuse6[15];
u8 interrupt; /* Interrupt Register */
u8 dontuse7[15];
u8 rx_error_counter; /* Receive Error Counter */
u8 dontuse8[15];
u8 tx_error_counter; /* Transmit Error Counter */
u8 dontuse9[31];
u8 p1_conf;
u8 dontuse10[15];
u8 p2_conf;
u8 dontuse11[15];
u8 p1_in;
u8 dontuse12[15];
u8 p2_in;
u8 dontuse13[15];
u8 p1_out;
u8 dontuse14[15];
u8 p2_out;
u8 dontuse15[15];
u8 serial_reset_addr;
};
};
} __packed;
/* Control Register (0x00) */
#define CTRL_INI 0x01 /* Initialization */
#define CTRL_IE 0x02 /* Interrupt Enable */
#define CTRL_SIE 0x04 /* Status Interrupt Enable */
#define CTRL_EIE 0x08 /* Error Interrupt Enable */
#define CTRL_EAF 0x20 /* Enable additional functions */
#define CTRL_CCE 0x40 /* Change Configuration Enable */
/* Status Register (0x01) */
#define STAT_LEC_STUFF 0x01 /* Stuff error */
#define STAT_LEC_FORM 0x02 /* Form error */
#define STAT_LEC_ACK 0x03 /* Acknowledgement error */
#define STAT_LEC_BIT1 0x04 /* Bit1 error */
#define STAT_LEC_BIT0 0x05 /* Bit0 error */
#define STAT_LEC_CRC 0x06 /* CRC error */
#define STAT_LEC_MASK 0x07 /* Last Error Code mask */
#define STAT_TXOK 0x08 /* Transmit Message Successfully */
#define STAT_RXOK 0x10 /* Receive Message Successfully */
#define STAT_WAKE 0x20 /* Wake Up Status */
#define STAT_WARN 0x40 /* Warning Status */
#define STAT_BOFF 0x80 /* Bus Off Status */
/*
* CPU Interface Register (0x02)
* Clock Out Register (0x1f)
* Bus Configuration Register (0x2f)
*
* see include/linux/can/platform/cc770.h
*/
/* Message Control Register 0 (Base Address + 0x0) */
#define INTPND_RES 0x01 /* No Interrupt pending */
#define INTPND_SET 0x02 /* Interrupt pending */
#define INTPND_UNC 0x03
#define RXIE_RES 0x04 /* Receive Interrupt Disable */
#define RXIE_SET 0x08 /* Receive Interrupt Enable */
#define RXIE_UNC 0x0c
#define TXIE_RES 0x10 /* Transmit Interrupt Disable */
#define TXIE_SET 0x20 /* Transmit Interrupt Enable */
#define TXIE_UNC 0x30
#define MSGVAL_RES 0x40 /* Message Invalid */
#define MSGVAL_SET 0x80 /* Message Valid */
#define MSGVAL_UNC 0xc0
/* Message Control Register 1 (Base Address + 0x01) */
#define NEWDAT_RES 0x01 /* No New Data */
#define NEWDAT_SET 0x02 /* New Data */
#define NEWDAT_UNC 0x03
#define MSGLST_RES 0x04 /* No Message Lost */
#define MSGLST_SET 0x08 /* Message Lost */
#define MSGLST_UNC 0x0c
#define CPUUPD_RES 0x04 /* No CPU Updating */
#define CPUUPD_SET 0x08 /* CPU Updating */
#define CPUUPD_UNC 0x0c
#define TXRQST_RES 0x10 /* No Transmission Request */
#define TXRQST_SET 0x20 /* Transmission Request */
#define TXRQST_UNC 0x30
#define RMTPND_RES 0x40 /* No Remote Request Pending */
#define RMTPND_SET 0x80 /* Remote Request Pending */
#define RMTPND_UNC 0xc0
/* Message Configuration Register (Base Address + 0x06) */
#define MSGCFG_XTD 0x04 /* Extended Identifier */
#define MSGCFG_DIR 0x08 /* Direction is Transmit */
#define MSGOBJ_FIRST 1
#define MSGOBJ_LAST 15
#define CC770_IO_SIZE 0x100
#define CC770_MAX_IRQ 20 /* max. number of interrupts handled in ISR */
#define CC770_MAX_MSG 4 /* max. number of messages handled in ISR */
#define CC770_ECHO_SKB_MAX 1
#define cc770_read_reg(priv, member) \
priv->read_reg(priv, offsetof(struct cc770_regs, member))
#define cc770_write_reg(priv, member, value) \
priv->write_reg(priv, offsetof(struct cc770_regs, member), value)
/*
* Message objects and flags used by this driver
*/
#define CC770_OBJ_FLAG_RX 0x01
#define CC770_OBJ_FLAG_RTR 0x02
#define CC770_OBJ_FLAG_EFF 0x04
enum {
CC770_OBJ_RX0 = 0, /* for receiving normal messages */
CC770_OBJ_RX1, /* for receiving normal messages */
CC770_OBJ_RX_RTR0, /* for receiving remote transmission requests */
CC770_OBJ_RX_RTR1, /* for receiving remote transmission requests */
CC770_OBJ_TX, /* for sending messages */
CC770_OBJ_MAX
};
#define obj2msgobj(o) (MSGOBJ_LAST - (o)) /* message object 11..15 */
/*
* CC770 private data structure
*/
struct cc770_priv {
struct can_priv can; /* must be the first member */
struct sk_buff *echo_skb;
/* the lower-layer is responsible for appropriate locking */
u8 (*read_reg)(const struct cc770_priv *priv, int reg);
void (*write_reg)(const struct cc770_priv *priv, int reg, u8 val);
void (*pre_irq)(const struct cc770_priv *priv);
void (*post_irq)(const struct cc770_priv *priv);
void *priv; /* for board-specific data */
struct net_device *dev;
void __iomem *reg_base; /* ioremap'ed address to registers */
unsigned long irq_flags; /* for request_irq() */
unsigned char obj_flags[CC770_OBJ_MAX];
u8 control_normal_mode; /* Control register for normal mode */
u8 cpu_interface; /* CPU interface register */
u8 clkout; /* Clock out register */
u8 bus_config; /* Bus conffiguration register */
};
struct net_device *alloc_cc770dev(int sizeof_priv);
void free_cc770dev(struct net_device *dev);
int register_cc770dev(struct net_device *dev);
void unregister_cc770dev(struct net_device *dev);
#endif /* CC770_DEV_H */

380
drivers/net/can/cc770/cc770_isa.c Normal file
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@ -0,0 +1,380 @@
/*
* Driver for CC770 and AN82527 CAN controllers on the legacy ISA bus
*
* Copyright (C) 2009, 2011 Wolfgang Grandegger <wg@grandegger.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the version 2 of the GNU General Public 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.
*/
/*
* Bosch CC770 and Intel AN82527 CAN controllers on the ISA or PC-104 bus.
* The I/O port or memory address and the IRQ number must be specified via
* module parameters:
*
* insmod cc770_isa.ko port=0x310,0x380 irq=7,11
*
* for ISA devices using I/O ports or:
*
* insmod cc770_isa.ko mem=0xd1000,0xd1000 irq=7,11
*
* for memory mapped ISA devices.
*
* Indirect access via address and data port is supported as well:
*
* insmod cc770_isa.ko port=0x310,0x380 indirect=1 irq=7,11
*
* Furthermore, the following mode parameter can be defined:
*
* clk: External oscillator clock frequency (default=16000000 [16 MHz])
* cir: CPU interface register (default=0x40 [DSC])
* bcr: Bus configuration register (default=0x40 [CBY])
* cor: Clockout register (default=0x00)
*
* Note: for clk, cir, bcr and cor, the first argument re-defines the
* default for all other devices, e.g.:
*
* insmod cc770_isa.ko mem=0xd1000,0xd1000 irq=7,11 clk=24000000
*
* is equivalent to
*
* insmod cc770_isa.ko mem=0xd1000,0xd1000 irq=7,11 clk=24000000,24000000
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/can.h>
#include <linux/can/dev.h>
#include <linux/can/platform/cc770.h>
#include "cc770.h"
#define MAXDEV 8
MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
MODULE_DESCRIPTION("Socket-CAN driver for CC770 on the ISA bus");
MODULE_LICENSE("GPL v2");
#define CLK_DEFAULT 16000000 /* 16 MHz */
#define COR_DEFAULT 0x00
#define BCR_DEFAULT BUSCFG_CBY
static unsigned long port[MAXDEV];
static unsigned long mem[MAXDEV];
static int irq[MAXDEV];
static int clk[MAXDEV];
static u8 cir[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
static u8 cor[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
static u8 bcr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
static int indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
module_param_array(port, ulong, NULL, S_IRUGO);
MODULE_PARM_DESC(port, "I/O port number");
module_param_array(mem, ulong, NULL, S_IRUGO);
MODULE_PARM_DESC(mem, "I/O memory address");
module_param_array(indirect, int, NULL, S_IRUGO);
MODULE_PARM_DESC(indirect, "Indirect access via address and data port");
module_param_array(irq, int, NULL, S_IRUGO);
MODULE_PARM_DESC(irq, "IRQ number");
module_param_array(clk, int, NULL, S_IRUGO);
MODULE_PARM_DESC(clk, "External oscillator clock frequency "
"(default=16000000 [16 MHz])");
module_param_array(cir, byte, NULL, S_IRUGO);
MODULE_PARM_DESC(cir, "CPU interface register (default=0x40 [DSC])");
module_param_array(cor, byte, NULL, S_IRUGO);
MODULE_PARM_DESC(cor, "Clockout register (default=0x00)");
module_param_array(bcr, byte, NULL, S_IRUGO);
MODULE_PARM_DESC(bcr, "Bus configuration register (default=0x40 [CBY])");
#define CC770_IOSIZE 0x20
#define CC770_IOSIZE_INDIRECT 0x02
/* Spinlock for cc770_isa_port_write_reg_indirect
* and cc770_isa_port_read_reg_indirect
*/
static DEFINE_SPINLOCK(cc770_isa_port_lock);
static struct platform_device *cc770_isa_devs[MAXDEV];
static u8 cc770_isa_mem_read_reg(const struct cc770_priv *priv, int reg)
{
return readb(priv->reg_base + reg);
}
static void cc770_isa_mem_write_reg(const struct cc770_priv *priv,
int reg, u8 val)
{
writeb(val, priv->reg_base + reg);
}
static u8 cc770_isa_port_read_reg(const struct cc770_priv *priv, int reg)
{
return inb((unsigned long)priv->reg_base + reg);
}
static void cc770_isa_port_write_reg(const struct cc770_priv *priv,
int reg, u8 val)
{
outb(val, (unsigned long)priv->reg_base + reg);
}
static u8 cc770_isa_port_read_reg_indirect(const struct cc770_priv *priv,
int reg)
{
unsigned long base = (unsigned long)priv->reg_base;
unsigned long flags;
u8 val;
spin_lock_irqsave(&cc770_isa_port_lock, flags);
outb(reg, base);
val = inb(base + 1);
spin_unlock_irqrestore(&cc770_isa_port_lock, flags);
return val;
}
static void cc770_isa_port_write_reg_indirect(const struct cc770_priv *priv,
int reg, u8 val)
{
unsigned long base = (unsigned long)priv->reg_base;
unsigned long flags;
spin_lock_irqsave(&cc770_isa_port_lock, flags);
outb(reg, base);
outb(val, base + 1);
spin_unlock_irqrestore(&cc770_isa_port_lock, flags);
}
static int cc770_isa_probe(struct platform_device *pdev)
{
struct net_device *dev;
struct cc770_priv *priv;
void __iomem *base = NULL;
int iosize = CC770_IOSIZE;
int idx = pdev->id;
int err;
u32 clktmp;
dev_dbg(&pdev->dev, "probing idx=%d: port=%#lx, mem=%#lx, irq=%d\n",
idx, port[idx], mem[idx], irq[idx]);
if (mem[idx]) {
if (!request_mem_region(mem[idx], iosize, KBUILD_MODNAME)) {
err = -EBUSY;
goto exit;
}
base = ioremap_nocache(mem[idx], iosize);
if (!base) {
err = -ENOMEM;
goto exit_release;
}
} else {
if (indirect[idx] > 0 ||
(indirect[idx] == -1 && indirect[0] > 0))
iosize = CC770_IOSIZE_INDIRECT;
if (!request_region(port[idx], iosize, KBUILD_MODNAME)) {
err = -EBUSY;
goto exit;
}
}
dev = alloc_cc770dev(0);
if (!dev) {
err = -ENOMEM;
goto exit_unmap;
}
priv = netdev_priv(dev);
dev->irq = irq[idx];
priv->irq_flags = IRQF_SHARED;
if (mem[idx]) {
priv->reg_base = base;
dev->base_addr = mem[idx];
priv->read_reg = cc770_isa_mem_read_reg;
priv->write_reg = cc770_isa_mem_write_reg;
} else {
priv->reg_base = (void __iomem *)port[idx];
dev->base_addr = port[idx];
if (iosize == CC770_IOSIZE_INDIRECT) {
priv->read_reg = cc770_isa_port_read_reg_indirect;
priv->write_reg = cc770_isa_port_write_reg_indirect;
} else {
priv->read_reg = cc770_isa_port_read_reg;
priv->write_reg = cc770_isa_port_write_reg;
}
}
if (clk[idx])
clktmp = clk[idx];
else if (clk[0])
clktmp = clk[0];
else
clktmp = CLK_DEFAULT;
priv->can.clock.freq = clktmp;
if (cir[idx] != 0xff) {
priv->cpu_interface = cir[idx];
} else if (cir[0] != 0xff) {
priv->cpu_interface = cir[0];
} else {
/* The system clock may not exceed 10 MHz */
if (clktmp > 10000000) {
priv->cpu_interface |= CPUIF_DSC;
clktmp /= 2;
}
/* The memory clock may not exceed 8 MHz */
if (clktmp > 8000000)
priv->cpu_interface |= CPUIF_DMC;
}
if (priv->cpu_interface & CPUIF_DSC)
priv->can.clock.freq /= 2;
if (bcr[idx] != 0xff)
priv->bus_config = bcr[idx];
else if (bcr[0] != 0xff)
priv->bus_config = bcr[0];
else
priv->bus_config = BCR_DEFAULT;
if (cor[idx] != 0xff)
priv->clkout = cor[idx];
else if (cor[0] != 0xff)
priv->clkout = cor[0];
else
priv->clkout = COR_DEFAULT;
platform_set_drvdata(pdev, dev);
SET_NETDEV_DEV(dev, &pdev->dev);
err = register_cc770dev(dev);
if (err) {
dev_err(&pdev->dev,
"couldn't register device (err=%d)\n", err);
goto exit_unmap;
}
dev_info(&pdev->dev, "device registered (reg_base=0x%p, irq=%d)\n",
priv->reg_base, dev->irq);
return 0;
exit_unmap:
if (mem[idx])
iounmap(base);
exit_release:
if (mem[idx])
release_mem_region(mem[idx], iosize);
else
release_region(port[idx], iosize);
exit:
return err;
}
static int cc770_isa_remove(struct platform_device *pdev)
{
struct net_device *dev = platform_get_drvdata(pdev);
struct cc770_priv *priv = netdev_priv(dev);
int idx = pdev->id;
unregister_cc770dev(dev);
if (mem[idx]) {
iounmap(priv->reg_base);
release_mem_region(mem[idx], CC770_IOSIZE);
} else {
if (priv->read_reg == cc770_isa_port_read_reg_indirect)
release_region(port[idx], CC770_IOSIZE_INDIRECT);
else
release_region(port[idx], CC770_IOSIZE);
}
free_cc770dev(dev);
return 0;
}
static struct platform_driver cc770_isa_driver = {
.probe = cc770_isa_probe,
.remove = cc770_isa_remove,
.driver = {
.name = KBUILD_MODNAME,
.owner = THIS_MODULE,
},
};
static int __init cc770_isa_init(void)
{
int idx, err;
for (idx = 0; idx < ARRAY_SIZE(cc770_isa_devs); idx++) {
if ((port[idx] || mem[idx]) && irq[idx]) {
cc770_isa_devs[idx] =
platform_device_alloc(KBUILD_MODNAME, idx);
if (!cc770_isa_devs[idx]) {
err = -ENOMEM;
goto exit_free_devices;
}
err = platform_device_add(cc770_isa_devs[idx]);
if (err) {
platform_device_put(cc770_isa_devs[idx]);
goto exit_free_devices;
}
pr_debug("platform device %d: port=%#lx, mem=%#lx, "
"irq=%d\n",
idx, port[idx], mem[idx], irq[idx]);
} else if (idx == 0 || port[idx] || mem[idx]) {
pr_err("insufficient parameters supplied\n");
err = -EINVAL;
goto exit_free_devices;
}
}
err = platform_driver_register(&cc770_isa_driver);
if (err)
goto exit_free_devices;
pr_info("driver for max. %d devices registered\n", MAXDEV);
return 0;
exit_free_devices:
while (--idx >= 0) {
if (cc770_isa_devs[idx])
platform_device_unregister(cc770_isa_devs[idx]);
}
return err;
}
module_init(cc770_isa_init);
static void __exit cc770_isa_exit(void)
{
int idx;
platform_driver_unregister(&cc770_isa_driver);
for (idx = 0; idx < ARRAY_SIZE(cc770_isa_devs); idx++) {
if (cc770_isa_devs[idx])
platform_device_unregister(cc770_isa_devs[idx]);
}
}
module_exit(cc770_isa_exit);

274
drivers/net/can/cc770/cc770_platform.c Normal file
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@ -0,0 +1,274 @@
/*
* Driver for CC770 and AN82527 CAN controllers on the platform bus
*
* Copyright (C) 2009, 2011 Wolfgang Grandegger <wg@grandegger.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the version 2 of the GNU General Public 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.
*/
/*
* If platform data are used you should have similar definitions
* in your board-specific code:
*
* static struct cc770_platform_data myboard_cc770_pdata = {
* .osc_freq = 16000000,
* .cir = 0x41,
* .cor = 0x20,
* .bcr = 0x40,
* };
*
* Please see include/linux/can/platform/cc770.h for description of
* above fields.
*
* If the device tree is used, you need a CAN node definition in your
* DTS file similar to:
*
* can@3,100 {
* compatible = "bosch,cc770";
* reg = <3 0x100 0x80>;
* interrupts = <2 0>;
* interrupt-parent = <&mpic>;
* bosch,external-clock-frequency = <16000000>;
* };
*
* See "Documentation/devicetree/bindings/net/can/cc770.txt" for further
* information.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/can.h>
#include <linux/can/dev.h>
#include <linux/can/platform/cc770.h>
#include "cc770.h"
#define DRV_NAME "cc770_platform"
MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
MODULE_DESCRIPTION("Socket-CAN driver for CC770 on the platform bus");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:" DRV_NAME);
#define CC770_PLATFORM_CAN_CLOCK 16000000
static u8 cc770_platform_read_reg(const struct cc770_priv *priv, int reg)
{
return ioread8(priv->reg_base + reg);
}
static void cc770_platform_write_reg(const struct cc770_priv *priv, int reg,
u8 val)
{
iowrite8(val, priv->reg_base + reg);
}
static int cc770_get_of_node_data(struct platform_device *pdev,
struct cc770_priv *priv)
{
struct device_node *np = pdev->dev.of_node;
const u32 *prop;
int prop_size;
u32 clkext;
prop = of_get_property(np, "bosch,external-clock-frequency",
&prop_size);
if (prop && (prop_size == sizeof(u32)))
clkext = *prop;
else
clkext = CC770_PLATFORM_CAN_CLOCK; /* default */
priv->can.clock.freq = clkext;
/* The system clock may not exceed 10 MHz */
if (priv->can.clock.freq > 10000000) {
priv->cpu_interface |= CPUIF_DSC;
priv->can.clock.freq /= 2;
}
/* The memory clock may not exceed 8 MHz */
if (priv->can.clock.freq > 8000000)
priv->cpu_interface |= CPUIF_DMC;
if (of_get_property(np, "bosch,divide-memory-clock", NULL))
priv->cpu_interface |= CPUIF_DMC;
if (of_get_property(np, "bosch,iso-low-speed-mux", NULL))
priv->cpu_interface |= CPUIF_MUX;
if (!of_get_property(np, "bosch,no-comperator-bypass", NULL))
priv->bus_config |= BUSCFG_CBY;
if (of_get_property(np, "bosch,disconnect-rx0-input", NULL))
priv->bus_config |= BUSCFG_DR0;
if (of_get_property(np, "bosch,disconnect-rx1-input", NULL))
priv->bus_config |= BUSCFG_DR1;
if (of_get_property(np, "bosch,disconnect-tx1-output", NULL))
priv->bus_config |= BUSCFG_DT1;
if (of_get_property(np, "bosch,polarity-dominant", NULL))
priv->bus_config |= BUSCFG_POL;
prop = of_get_property(np, "bosch,clock-out-frequency", &prop_size);
if (prop && (prop_size == sizeof(u32)) && *prop > 0) {
u32 cdv = clkext / *prop;
int slew;
if (cdv > 0 && cdv < 16) {
priv->cpu_interface |= CPUIF_CEN;
priv->clkout |= (cdv - 1) & CLKOUT_CD_MASK;
prop = of_get_property(np, "bosch,slew-rate",
&prop_size);
if (prop && (prop_size == sizeof(u32))) {
slew = *prop;
} else {
/* Determine default slew rate */
slew = (CLKOUT_SL_MASK >>
CLKOUT_SL_SHIFT) -
((cdv * clkext - 1) / 8000000);
if (slew < 0)
slew = 0;
}
priv->clkout |= (slew << CLKOUT_SL_SHIFT) &
CLKOUT_SL_MASK;
} else {
dev_dbg(&pdev->dev, "invalid clock-out-frequency\n");
}
}
return 0;
}
static int cc770_get_platform_data(struct platform_device *pdev,
struct cc770_priv *priv)
{
struct cc770_platform_data *pdata = dev_get_platdata(&pdev->dev);
priv->can.clock.freq = pdata->osc_freq;
if (priv->cpu_interface & CPUIF_DSC)
priv->can.clock.freq /= 2;
priv->clkout = pdata->cor;
priv->bus_config = pdata->bcr;
priv->cpu_interface = pdata->cir;
return 0;
}
static int cc770_platform_probe(struct platform_device *pdev)
{
struct net_device *dev;
struct cc770_priv *priv;
struct resource *mem;
resource_size_t mem_size;
void __iomem *base;
int err, irq;
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
irq = platform_get_irq(pdev, 0);
if (!mem || irq <= 0)
return -ENODEV;
mem_size = resource_size(mem);
if (!request_mem_region(mem->start, mem_size, pdev->name))
return -EBUSY;
base = ioremap(mem->start, mem_size);
if (!base) {
err = -ENOMEM;
goto exit_release_mem;
}
dev = alloc_cc770dev(0);
if (!dev) {
err = -ENOMEM;
goto exit_unmap_mem;
}
dev->irq = irq;
priv = netdev_priv(dev);
priv->read_reg = cc770_platform_read_reg;
priv->write_reg = cc770_platform_write_reg;
priv->irq_flags = IRQF_SHARED;
priv->reg_base = base;
if (pdev->dev.of_node)
err = cc770_get_of_node_data(pdev, priv);
else if (dev_get_platdata(&pdev->dev))
err = cc770_get_platform_data(pdev, priv);
else
err = -ENODEV;
if (err)
goto exit_free_cc770;
dev_dbg(&pdev->dev,
"reg_base=0x%p irq=%d clock=%d cpu_interface=0x%02x "
"bus_config=0x%02x clkout=0x%02x\n",
priv->reg_base, dev->irq, priv->can.clock.freq,
priv->cpu_interface, priv->bus_config, priv->clkout);
platform_set_drvdata(pdev, dev);
SET_NETDEV_DEV(dev, &pdev->dev);
err = register_cc770dev(dev);
if (err) {
dev_err(&pdev->dev,
"couldn't register CC700 device (err=%d)\n", err);
goto exit_free_cc770;
}
return 0;
exit_free_cc770:
free_cc770dev(dev);
exit_unmap_mem:
iounmap(base);
exit_release_mem:
release_mem_region(mem->start, mem_size);
return err;
}
static int cc770_platform_remove(struct platform_device *pdev)
{
struct net_device *dev = platform_get_drvdata(pdev);
struct cc770_priv *priv = netdev_priv(dev);
struct resource *mem;
unregister_cc770dev(dev);
iounmap(priv->reg_base);
free_cc770dev(dev);
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(mem->start, resource_size(mem));
return 0;
}
static struct of_device_id cc770_platform_table[] = {
{.compatible = "bosch,cc770"}, /* CC770 from Bosch */
{.compatible = "intc,82527"}, /* AN82527 from Intel CP */
{},
};
MODULE_DEVICE_TABLE(of, cc770_platform_table);
static struct platform_driver cc770_platform_driver = {
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
.of_match_table = cc770_platform_table,
},
.probe = cc770_platform_probe,
.remove = cc770_platform_remove,
};
module_platform_driver(cc770_platform_driver);