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can: add driver for Softing card

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This patch adds a driver for the platform:softing device.
This will create (up to) 2 CAN network devices from 1
platform:softing device

Signed-off-by: Kurt Van Dijck <kurt.van.dijck@eia.be>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kurt Van Dijck 2011-01-11 04:32:31 +00:00 committed by David S. Miller
parent 2221eca0a2
commit 03fd3cf5a1
8 changed files with 1815 additions and 0 deletions
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2
drivers/net/can/Kconfig
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@ -117,6 +117,8 @@ source "drivers/net/can/sja1000/Kconfig"
source "drivers/net/can/usb/Kconfig"
source "drivers/net/can/softing/Kconfig"
config CAN_DEBUG_DEVICES
bool "CAN devices debugging messages"
depends on CAN

1
drivers/net/can/Makefile
View File

@ -9,6 +9,7 @@ obj-$(CONFIG_CAN_DEV) += can-dev.o
can-dev-y := dev.o
obj-y += usb/
obj-y += softing/
obj-$(CONFIG_CAN_SJA1000) += sja1000/
obj-$(CONFIG_CAN_MSCAN) += mscan/

16
drivers/net/can/softing/Kconfig Normal file
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@ -0,0 +1,16 @@
config CAN_SOFTING
tristate "Softing Gmbh CAN generic support"
depends on CAN_DEV
---help---
Support for CAN cards from Softing Gmbh & some cards
from Vector Gmbh.
Softing Gmbh CAN cards come with 1 or 2 physical busses.
Those cards typically use Dual Port RAM to communicate
with the host CPU. The interface is then identical for PCI
and PCMCIA cards. This driver operates on a platform device,
which has been created by softing_cs or softing_pci driver.
Warning:
The API of the card does not allow fine control per bus, but
controls the 2 busses on the card together.
As such, some actions (start/stop/busoff recovery) on 1 bus
must bring down the other bus too temporarily.

5
drivers/net/can/softing/Makefile Normal file
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@ -0,0 +1,5 @@
softing-y := softing_main.o softing_fw.o
obj-$(CONFIG_CAN_SOFTING) += softing.o
ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG

167
drivers/net/can/softing/softing.h Normal file
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@ -0,0 +1,167 @@
/*
* softing common interfaces
*
* by Kurt Van Dijck, 2008-2010
*/
#include <linux/atomic.h>
#include <linux/netdevice.h>
#include <linux/ktime.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/can.h>
#include <linux/can/dev.h>
#include "softing_platform.h"
struct softing;
struct softing_priv {
struct can_priv can; /* must be the first member! */
struct net_device *netdev;
struct softing *card;
struct {
int pending;
/* variables wich hold the circular buffer */
int echo_put;
int echo_get;
} tx;
struct can_bittiming_const btr_const;
int index;
uint8_t output;
uint16_t chip;
};
#define netdev2softing(netdev) ((struct softing_priv *)netdev_priv(netdev))
struct softing {
const struct softing_platform_data *pdat;
struct platform_device *pdev;
struct net_device *net[2];
spinlock_t spin; /* protect this structure & DPRAM access */
ktime_t ts_ref;
ktime_t ts_overflow; /* timestamp overflow value, in ktime */
struct {
/* indication of firmware status */
int up;
/* protection of the 'up' variable */
struct mutex lock;
} fw;
struct {
int nr;
int requested;
int svc_count;
unsigned int dpram_position;
} irq;
struct {
int pending;
int last_bus;
/*
* keep the bus that last tx'd a message,
* in order to let every netdev queue resume
*/
} tx;
__iomem uint8_t *dpram;
unsigned long dpram_phys;
unsigned long dpram_size;
struct {
uint16_t fw_version, hw_version, license, serial;
uint16_t chip[2];
unsigned int freq; /* remote cpu's operating frequency */
} id;
};
extern int softing_default_output(struct net_device *netdev);
extern ktime_t softing_raw2ktime(struct softing *card, u32 raw);
extern int softing_chip_poweron(struct softing *card);
extern int softing_bootloader_command(struct softing *card, int16_t cmd,
const char *msg);
/* Load firmware after reset */
extern int softing_load_fw(const char *file, struct softing *card,
__iomem uint8_t *virt, unsigned int size, int offset);
/* Load final application firmware after bootloader */
extern int softing_load_app_fw(const char *file, struct softing *card);
/*
* enable or disable irq
* only called with fw.lock locked
*/
extern int softing_enable_irq(struct softing *card, int enable);
/* start/stop 1 bus on card */
extern int softing_startstop(struct net_device *netdev, int up);
/* netif_rx() */
extern int softing_netdev_rx(struct net_device *netdev,
const struct can_frame *msg, ktime_t ktime);
/* SOFTING DPRAM mappings */
#define DPRAM_RX 0x0000
#define DPRAM_RX_SIZE 32
#define DPRAM_RX_CNT 16
#define DPRAM_RX_RD 0x0201 /* uint8_t */
#define DPRAM_RX_WR 0x0205 /* uint8_t */
#define DPRAM_RX_LOST 0x0207 /* uint8_t */
#define DPRAM_FCT_PARAM 0x0300 /* int16_t [20] */
#define DPRAM_FCT_RESULT 0x0328 /* int16_t */
#define DPRAM_FCT_HOST 0x032b /* uint16_t */
#define DPRAM_INFO_BUSSTATE 0x0331 /* uint16_t */
#define DPRAM_INFO_BUSSTATE2 0x0335 /* uint16_t */
#define DPRAM_INFO_ERRSTATE 0x0339 /* uint16_t */
#define DPRAM_INFO_ERRSTATE2 0x033d /* uint16_t */
#define DPRAM_RESET 0x0341 /* uint16_t */
#define DPRAM_CLR_RECV_FIFO 0x0345 /* uint16_t */
#define DPRAM_RESET_TIME 0x034d /* uint16_t */
#define DPRAM_TIME 0x0350 /* uint64_t */
#define DPRAM_WR_START 0x0358 /* uint8_t */
#define DPRAM_WR_END 0x0359 /* uint8_t */
#define DPRAM_RESET_RX_FIFO 0x0361 /* uint16_t */
#define DPRAM_RESET_TX_FIFO 0x0364 /* uint8_t */
#define DPRAM_READ_FIFO_LEVEL 0x0365 /* uint8_t */
#define DPRAM_RX_FIFO_LEVEL 0x0366 /* uint16_t */
#define DPRAM_TX_FIFO_LEVEL 0x0366 /* uint16_t */
#define DPRAM_TX 0x0400 /* uint16_t */
#define DPRAM_TX_SIZE 16
#define DPRAM_TX_CNT 32
#define DPRAM_TX_RD 0x0601 /* uint8_t */
#define DPRAM_TX_WR 0x0605 /* uint8_t */
#define DPRAM_COMMAND 0x07e0 /* uint16_t */
#define DPRAM_RECEIPT 0x07f0 /* uint16_t */
#define DPRAM_IRQ_TOHOST 0x07fe /* uint8_t */
#define DPRAM_IRQ_TOCARD 0x07ff /* uint8_t */
#define DPRAM_V2_RESET 0x0e00 /* uint8_t */
#define DPRAM_V2_IRQ_TOHOST 0x0e02 /* uint8_t */
#define TXMAX (DPRAM_TX_CNT - 1)
/* DPRAM return codes */
#define RES_NONE 0
#define RES_OK 1
#define RES_NOK 2
#define RES_UNKNOWN 3
/* DPRAM flags */
#define CMD_TX 0x01
#define CMD_ACK 0x02
#define CMD_XTD 0x04
#define CMD_RTR 0x08
#define CMD_ERR 0x10
#define CMD_BUS2 0x80
/* returned fifo entry bus state masks */
#define SF_MASK_BUSOFF 0x80
#define SF_MASK_EPASSIVE 0x60
/* bus states */
#define STATE_BUSOFF 2
#define STATE_EPASSIVE 1
#define STATE_EACTIVE 0

691
drivers/net/can/softing/softing_fw.c Normal file
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@ -0,0 +1,691 @@
/*
* Copyright (C) 2008-2010
*
* - Kurt Van Dijck, EIA Electronics
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/firmware.h>
#include <linux/sched.h>
#include <asm/div64.h>
#include "softing.h"
/*
* low level DPRAM command.
* Make sure that card->dpram[DPRAM_FCT_HOST] is preset
*/
static int _softing_fct_cmd(struct softing *card, int16_t cmd, uint16_t vector,
const char *msg)
{
int ret;
unsigned long stamp;
iowrite16(cmd, &card->dpram[DPRAM_FCT_PARAM]);
iowrite8(vector >> 8, &card->dpram[DPRAM_FCT_HOST + 1]);
iowrite8(vector, &card->dpram[DPRAM_FCT_HOST]);
/* be sure to flush this to the card */
wmb();
stamp = jiffies + 1 * HZ;
/* wait for card */
do {
/* DPRAM_FCT_HOST is _not_ aligned */
ret = ioread8(&card->dpram[DPRAM_FCT_HOST]) +
(ioread8(&card->dpram[DPRAM_FCT_HOST + 1]) << 8);
/* don't have any cached variables */
rmb();
if (ret == RES_OK)
/* read return-value now */
return ioread16(&card->dpram[DPRAM_FCT_RESULT]);
if ((ret != vector) || time_after(jiffies, stamp))
break;
/* process context => relax */
usleep_range(500, 10000);
} while (1);
ret = (ret == RES_NONE) ? -ETIMEDOUT : -ECANCELED;
dev_alert(&card->pdev->dev, "firmware %s failed (%i)\n", msg, ret);
return ret;
}
static int softing_fct_cmd(struct softing *card, int16_t cmd, const char *msg)
{
int ret;
ret = _softing_fct_cmd(card, cmd, 0, msg);
if (ret > 0) {
dev_alert(&card->pdev->dev, "%s returned %u\n", msg, ret);
ret = -EIO;
}
return ret;
}
int softing_bootloader_command(struct softing *card, int16_t cmd,
const char *msg)
{
int ret;
unsigned long stamp;
iowrite16(RES_NONE, &card->dpram[DPRAM_RECEIPT]);
iowrite16(cmd, &card->dpram[DPRAM_COMMAND]);
/* be sure to flush this to the card */
wmb();
stamp = jiffies + 3 * HZ;
/* wait for card */
do {
ret = ioread16(&card->dpram[DPRAM_RECEIPT]);
/* don't have any cached variables */
rmb();
if (ret == RES_OK)
return 0;
if (time_after(jiffies, stamp))
break;
/* process context => relax */
usleep_range(500, 10000);
} while (!signal_pending(current));
ret = (ret == RES_NONE) ? -ETIMEDOUT : -ECANCELED;
dev_alert(&card->pdev->dev, "bootloader %s failed (%i)\n", msg, ret);
return ret;
}
static int fw_parse(const uint8_t **pmem, uint16_t *ptype, uint32_t *paddr,
uint16_t *plen, const uint8_t **pdat)
{
uint16_t checksum[2];
const uint8_t *mem;
const uint8_t *end;
/*
* firmware records are a binary, unaligned stream composed of:
* uint16_t type;
* uint32_t addr;
* uint16_t len;
* uint8_t dat[len];
* uint16_t checksum;
* all values in little endian.
* We could define a struct for this, with __attribute__((packed)),
* but would that solve the alignment in _all_ cases (cfr. the
* struct itself may be an odd address)?
*
* I chose to use leXX_to_cpup() since this solves both
* endianness & alignment.
*/
mem = *pmem;
*ptype = le16_to_cpup((void *)&mem[0]);
*paddr = le32_to_cpup((void *)&mem[2]);
*plen = le16_to_cpup((void *)&mem[6]);
*pdat = &mem[8];
/* verify checksum */
end = &mem[8 + *plen];
checksum[0] = le16_to_cpup((void *)end);
for (checksum[1] = 0; mem < end; ++mem)
checksum[1] += *mem;
if (checksum[0] != checksum[1])
return -EINVAL;
/* increment */
*pmem += 10 + *plen;
return 0;
}
int softing_load_fw(const char *file, struct softing *card,
__iomem uint8_t *dpram, unsigned int size, int offset)
{
const struct firmware *fw;
int ret;
const uint8_t *mem, *end, *dat;
uint16_t type, len;
uint32_t addr;
uint8_t *buf = NULL;
int buflen = 0;
int8_t type_end = 0;
ret = request_firmware(&fw, file, &card->pdev->dev);
if (ret < 0)
return ret;
dev_dbg(&card->pdev->dev, "%s, firmware(%s) got %u bytes"
", offset %c0x%04x\n",
card->pdat->name, file, (unsigned int)fw->size,
(offset >= 0) ? '+' : '-', (unsigned int)abs(offset));
/* parse the firmware */
mem = fw->data;
end = &mem[fw->size];
/* look for header record */
ret = fw_parse(&mem, &type, &addr, &len, &dat);
if (ret < 0)
goto failed;
if (type != 0xffff)
goto failed;
if (strncmp("Structured Binary Format, Softing GmbH" , dat, len)) {
ret = -EINVAL;
goto failed;
}
/* ok, we had a header */
while (mem < end) {
ret = fw_parse(&mem, &type, &addr, &len, &dat);
if (ret < 0)
goto failed;
if (type == 3) {
/* start address, not used here */
continue;
} else if (type == 1) {
/* eof */
type_end = 1;
break;
} else if (type != 0) {
ret = -EINVAL;
goto failed;
}
if ((addr + len + offset) > size)
goto failed;
memcpy_toio(&dpram[addr + offset], dat, len);
/* be sure to flush caches from IO space */
mb();
if (len > buflen) {
/* align buflen */
buflen = (len + (1024-1)) & ~(1024-1);
buf = krealloc(buf, buflen, GFP_KERNEL);
if (!buf) {
ret = -ENOMEM;
goto failed;
}
}
/* verify record data */
memcpy_fromio(buf, &dpram[addr + offset], len);
if (memcmp(buf, dat, len)) {
/* is not ok */
dev_alert(&card->pdev->dev, "DPRAM readback failed\n");
ret = -EIO;
goto failed;
}
}
if (!type_end)
/* no end record seen */
goto failed;
ret = 0;
failed:
kfree(buf);
release_firmware(fw);
if (ret < 0)
dev_info(&card->pdev->dev, "firmware %s failed\n", file);
return ret;
}
int softing_load_app_fw(const char *file, struct softing *card)
{
const struct firmware *fw;
const uint8_t *mem, *end, *dat;
int ret, j;
uint16_t type, len;
uint32_t addr, start_addr = 0;
unsigned int sum, rx_sum;
int8_t type_end = 0, type_entrypoint = 0;
ret = request_firmware(&fw, file, &card->pdev->dev);
if (ret) {
dev_alert(&card->pdev->dev, "request_firmware(%s) got %i\n",
file, ret);
return ret;
}
dev_dbg(&card->pdev->dev, "firmware(%s) got %lu bytes\n",
file, (unsigned long)fw->size);
/* parse the firmware */
mem = fw->data;
end = &mem[fw->size];
/* look for header record */
ret = fw_parse(&mem, &type, &addr, &len, &dat);
if (ret)
goto failed;
ret = -EINVAL;
if (type != 0xffff) {
dev_alert(&card->pdev->dev, "firmware starts with type 0x%x\n",
type);
goto failed;
}
if (strncmp("Structured Binary Format, Softing GmbH", dat, len)) {
dev_alert(&card->pdev->dev, "firmware string '%.*s' fault\n",
len, dat);
goto failed;
}
/* ok, we had a header */
while (mem < end) {
ret = fw_parse(&mem, &type, &addr, &len, &dat);
if (ret)
goto failed;
if (type == 3) {
/* start address */
start_addr = addr;
type_entrypoint = 1;
continue;
} else if (type == 1) {
/* eof */
type_end = 1;
break;
} else if (type != 0) {
dev_alert(&card->pdev->dev,
"unknown record type 0x%04x\n", type);
ret = -EINVAL;
goto failed;
}
/* regualar data */
for (sum = 0, j = 0; j < len; ++j)
sum += dat[j];
/* work in 16bit (target) */
sum &= 0xffff;
memcpy_toio(&card->dpram[card->pdat->app.offs], dat, len);
iowrite32(card->pdat->app.offs + card->pdat->app.addr,
&card->dpram[DPRAM_COMMAND + 2]);
iowrite32(addr, &card->dpram[DPRAM_COMMAND + 6]);
iowrite16(len, &card->dpram[DPRAM_COMMAND + 10]);
iowrite8(1, &card->dpram[DPRAM_COMMAND + 12]);
ret = softing_bootloader_command(card, 1, "loading app.");
if (ret < 0)
goto failed;
/* verify checksum */
rx_sum = ioread16(&card->dpram[DPRAM_RECEIPT + 2]);
if (rx_sum != sum) {
dev_alert(&card->pdev->dev, "SRAM seems to be damaged"
", wanted 0x%04x, got 0x%04x\n", sum, rx_sum);
ret = -EIO;
goto failed;
}
}
if (!type_end || !type_entrypoint)
goto failed;
/* start application in card */
iowrite32(start_addr, &card->dpram[DPRAM_COMMAND + 2]);
iowrite8(1, &card->dpram[DPRAM_COMMAND + 6]);
ret = softing_bootloader_command(card, 3, "start app.");
if (ret < 0)
goto failed;
ret = 0;
failed:
release_firmware(fw);
if (ret < 0)
dev_info(&card->pdev->dev, "firmware %s failed\n", file);
return ret;
}
static int softing_reset_chip(struct softing *card)
{
int ret;
do {
/* reset chip */
iowrite8(0, &card->dpram[DPRAM_RESET_RX_FIFO]);
iowrite8(0, &card->dpram[DPRAM_RESET_RX_FIFO+1]);
iowrite8(1, &card->dpram[DPRAM_RESET]);
iowrite8(0, &card->dpram[DPRAM_RESET+1]);
ret = softing_fct_cmd(card, 0, "reset_can");
if (!ret)
break;
if (signal_pending(current))
/* don't wait any longer */
break;
} while (1);
card->tx.pending = 0;
return ret;
}
int softing_chip_poweron(struct softing *card)
{
int ret;
/* sync */
ret = _softing_fct_cmd(card, 99, 0x55, "sync-a");
if (ret < 0)
goto failed;
ret = _softing_fct_cmd(card, 99, 0xaa, "sync-b");
if (ret < 0)
goto failed;
ret = softing_reset_chip(card);
if (ret < 0)
goto failed;
/* get_serial */
ret = softing_fct_cmd(card, 43, "get_serial_number");
if (ret < 0)
goto failed;
card->id.serial = ioread32(&card->dpram[DPRAM_FCT_PARAM]);
/* get_version */
ret = softing_fct_cmd(card, 12, "get_version");
if (ret < 0)
goto failed;
card->id.fw_version = ioread16(&card->dpram[DPRAM_FCT_PARAM + 2]);
card->id.hw_version = ioread16(&card->dpram[DPRAM_FCT_PARAM + 4]);
card->id.license = ioread16(&card->dpram[DPRAM_FCT_PARAM + 6]);
card->id.chip[0] = ioread16(&card->dpram[DPRAM_FCT_PARAM + 8]);
card->id.chip[1] = ioread16(&card->dpram[DPRAM_FCT_PARAM + 10]);
return 0;
failed:
return ret;
}
static void softing_initialize_timestamp(struct softing *card)
{
uint64_t ovf;
card->ts_ref = ktime_get();
/* 16MHz is the reference */
ovf = 0x100000000ULL * 16;
do_div(ovf, card->pdat->freq ?: 16);
card->ts_overflow = ktime_add_us(ktime_set(0, 0), ovf);
}
ktime_t softing_raw2ktime(struct softing *card, u32 raw)
{
uint64_t rawl;
ktime_t now, real_offset;
ktime_t target;
ktime_t tmp;
now = ktime_get();
real_offset = ktime_sub(ktime_get_real(), now);
/* find nsec from card */
rawl = raw * 16;
do_div(rawl, card->pdat->freq ?: 16);
target = ktime_add_us(card->ts_ref, rawl);
/* test for overflows */
tmp = ktime_add(target, card->ts_overflow);
while (unlikely(ktime_to_ns(tmp) > ktime_to_ns(now))) {
card->ts_ref = ktime_add(card->ts_ref, card->ts_overflow);
target = tmp;
tmp = ktime_add(target, card->ts_overflow);
}
return ktime_add(target, real_offset);
}
static inline int softing_error_reporting(struct net_device *netdev)
{
struct softing_priv *priv = netdev_priv(netdev);
return (priv->can.ctrlmode & CAN_CTRLMODE_BERR_REPORTING)
? 1 : 0;
}
int softing_startstop(struct net_device *dev, int up)
{
int ret;
struct softing *card;
struct softing_priv *priv;
struct net_device *netdev;
int bus_bitmask_start;
int j, error_reporting;
struct can_frame msg;
const struct can_bittiming *bt;
priv = netdev_priv(dev);
card = priv->card;
if (!card->fw.up)
return -EIO;
ret = mutex_lock_interruptible(&card->fw.lock);
if (ret)
return ret;
bus_bitmask_start = 0;
if (dev && up)
/* prepare to start this bus as well */
bus_bitmask_start |= (1 << priv->index);
/* bring netdevs down */
for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
netdev = card->net[j];
if (!netdev)
continue;
priv = netdev_priv(netdev);
if (dev != netdev)
netif_stop_queue(netdev);
if (netif_running(netdev)) {
if (dev != netdev)
bus_bitmask_start |= (1 << j);
priv->tx.pending = 0;
priv->tx.echo_put = 0;
priv->tx.echo_get = 0;
/*
* this bus' may just have called open_candev()
* which is rather stupid to call close_candev()
* already
* but we may come here from busoff recovery too
* in which case the echo_skb _needs_ flushing too.
* just be sure to call open_candev() again
*/
close_candev(netdev);
}
priv->can.state = CAN_STATE_STOPPED;
}
card->tx.pending = 0;
softing_enable_irq(card, 0);
ret = softing_reset_chip(card);
if (ret)
goto failed;
if (!bus_bitmask_start)
/* no busses to be brought up */
goto card_done;
if ((bus_bitmask_start & 1) && (bus_bitmask_start & 2)
&& (softing_error_reporting(card->net[0])
!= softing_error_reporting(card->net[1]))) {
dev_alert(&card->pdev->dev,
"err_reporting flag differs for busses\n");
goto invalid;
}
error_reporting = 0;
if (bus_bitmask_start & 1) {
netdev = card->net[0];
priv = netdev_priv(netdev);
error_reporting += softing_error_reporting(netdev);
/* init chip 1 */
bt = &priv->can.bittiming;
iowrite16(bt->brp, &card->dpram[DPRAM_FCT_PARAM + 2]);
iowrite16(bt->sjw, &card->dpram[DPRAM_FCT_PARAM + 4]);
iowrite16(bt->phase_seg1 + bt->prop_seg,
&card->dpram[DPRAM_FCT_PARAM + 6]);
iowrite16(bt->phase_seg2, &card->dpram[DPRAM_FCT_PARAM + 8]);
iowrite16((priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) ? 1 : 0,
&card->dpram[DPRAM_FCT_PARAM + 10]);
ret = softing_fct_cmd(card, 1, "initialize_chip[0]");
if (ret < 0)
goto failed;
/* set mode */
iowrite16(0, &card->dpram[DPRAM_FCT_PARAM + 2]);
iowrite16(0, &card->dpram[DPRAM_FCT_PARAM + 4]);
ret = softing_fct_cmd(card, 3, "set_mode[0]");
if (ret < 0)
goto failed;
/* set filter */
/* 11bit id & mask */
iowrite16(0x0000, &card->dpram[DPRAM_FCT_PARAM + 2]);
iowrite16(0x07ff, &card->dpram[DPRAM_FCT_PARAM + 4]);
/* 29bit id.lo & mask.lo & id.hi & mask.hi */
iowrite16(0x0000, &card->dpram[DPRAM_FCT_PARAM + 6]);
iowrite16(0xffff, &card->dpram[DPRAM_FCT_PARAM + 8]);
iowrite16(0x0000, &card->dpram[DPRAM_FCT_PARAM + 10]);
iowrite16(0x1fff, &card->dpram[DPRAM_FCT_PARAM + 12]);
ret = softing_fct_cmd(card, 7, "set_filter[0]");
if (ret < 0)
goto failed;
/* set output control */
iowrite16(priv->output, &card->dpram[DPRAM_FCT_PARAM + 2]);
ret = softing_fct_cmd(card, 5, "set_output[0]");
if (ret < 0)
goto failed;
}
if (bus_bitmask_start & 2) {
netdev = card->net[1];
priv = netdev_priv(netdev);
error_reporting += softing_error_reporting(netdev);
/* init chip2 */
bt = &priv->can.bittiming;
iowrite16(bt->brp, &card->dpram[DPRAM_FCT_PARAM + 2]);
iowrite16(bt->sjw, &card->dpram[DPRAM_FCT_PARAM + 4]);
iowrite16(bt->phase_seg1 + bt->prop_seg,
&card->dpram[DPRAM_FCT_PARAM + 6]);
iowrite16(bt->phase_seg2, &card->dpram[DPRAM_FCT_PARAM + 8]);
iowrite16((priv->can.ctrlmode & CAN_CTRLMODE_3_SAMPLES) ? 1 : 0,
&card->dpram[DPRAM_FCT_PARAM + 10]);
ret = softing_fct_cmd(card, 2, "initialize_chip[1]");
if (ret < 0)
goto failed;
/* set mode2 */
iowrite16(0, &card->dpram[DPRAM_FCT_PARAM + 2]);
iowrite16(0, &card->dpram[DPRAM_FCT_PARAM + 4]);
ret = softing_fct_cmd(card, 4, "set_mode[1]");
if (ret < 0)
goto failed;
/* set filter2 */
/* 11bit id & mask */
iowrite16(0x0000, &card->dpram[DPRAM_FCT_PARAM + 2]);
iowrite16(0x07ff, &card->dpram[DPRAM_FCT_PARAM + 4]);
/* 29bit id.lo & mask.lo & id.hi & mask.hi */
iowrite16(0x0000, &card->dpram[DPRAM_FCT_PARAM + 6]);
iowrite16(0xffff, &card->dpram[DPRAM_FCT_PARAM + 8]);
iowrite16(0x0000, &card->dpram[DPRAM_FCT_PARAM + 10]);
iowrite16(0x1fff, &card->dpram[DPRAM_FCT_PARAM + 12]);
ret = softing_fct_cmd(card, 8, "set_filter[1]");
if (ret < 0)
goto failed;
/* set output control2 */
iowrite16(priv->output, &card->dpram[DPRAM_FCT_PARAM + 2]);
ret = softing_fct_cmd(card, 6, "set_output[1]");
if (ret < 0)
goto failed;
}
/* enable_error_frame */
/*
* Error reporting is switched off at the moment since
* the receiving of them is not yet 100% verified
* This should be enabled sooner or later
*
if (error_reporting) {
ret = softing_fct_cmd(card, 51, "enable_error_frame");
if (ret < 0)
goto failed;
}
*/
/* initialize interface */
iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 2]);
iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 4]);
iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 6]);
iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 8]);
iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 10]);
iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 12]);
iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 14]);
iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 16]);
iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 18]);
iowrite16(1, &card->dpram[DPRAM_FCT_PARAM + 20]);
ret = softing_fct_cmd(card, 17, "initialize_interface");
if (ret < 0)
goto failed;
/* enable_fifo */
ret = softing_fct_cmd(card, 36, "enable_fifo");
if (ret < 0)
goto failed;
/* enable fifo tx ack */
ret = softing_fct_cmd(card, 13, "fifo_tx_ack[0]");
if (ret < 0)
goto failed;
/* enable fifo tx ack2 */
ret = softing_fct_cmd(card, 14, "fifo_tx_ack[1]");
if (ret < 0)
goto failed;
/* start_chip */
ret = softing_fct_cmd(card, 11, "start_chip");
if (ret < 0)
goto failed;
iowrite8(0, &card->dpram[DPRAM_INFO_BUSSTATE]);
iowrite8(0, &card->dpram[DPRAM_INFO_BUSSTATE2]);
if (card->pdat->generation < 2) {
iowrite8(0, &card->dpram[DPRAM_V2_IRQ_TOHOST]);
/* flush the DPRAM caches */
wmb();
}
softing_initialize_timestamp(card);
/*
* do socketcan notifications/status changes
* from here, no errors should occur, or the failed: part
* must be reviewed
*/
memset(&msg, 0, sizeof(msg));
msg.can_id = CAN_ERR_FLAG | CAN_ERR_RESTARTED;
msg.can_dlc = CAN_ERR_DLC;
for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
if (!(bus_bitmask_start & (1 << j)))
continue;
netdev = card->net[j];
if (!netdev)
continue;
priv = netdev_priv(netdev);
priv->can.state = CAN_STATE_ERROR_ACTIVE;
open_candev(netdev);
if (dev != netdev) {
/* notify other busses on the restart */
softing_netdev_rx(netdev, &msg, ktime_set(0, 0));
++priv->can.can_stats.restarts;
}
netif_wake_queue(netdev);
}
/* enable interrupts */
ret = softing_enable_irq(card, 1);
if (ret)
goto failed;
card_done:
mutex_unlock(&card->fw.lock);
return 0;
invalid:
ret = -EINVAL;
failed:
softing_enable_irq(card, 0);
softing_reset_chip(card);
mutex_unlock(&card->fw.lock);
/* bring all other interfaces down */
for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
netdev = card->net[j];
if (!netdev)
continue;
dev_close(netdev);
}
return ret;
}
int softing_default_output(struct net_device *netdev)
{
struct softing_priv *priv = netdev_priv(netdev);
struct softing *card = priv->card;
switch (priv->chip) {
case 1000:
return (card->pdat->generation < 2) ? 0xfb : 0xfa;
case 5:
return 0x60;
default:
return 0x40;
}
}

893
drivers/net/can/softing/softing_main.c Normal file
View File

@ -0,0 +1,893 @@
/*
* Copyright (C) 2008-2010
*
* - Kurt Van Dijck, EIA Electronics
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/version.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include "softing.h"
#define TX_ECHO_SKB_MAX (((TXMAX+1)/2)-1)
/*
* test is a specific CAN netdev
* is online (ie. up 'n running, not sleeping, not busoff
*/
static inline int canif_is_active(struct net_device *netdev)
{
struct can_priv *can = netdev_priv(netdev);
if (!netif_running(netdev))
return 0;
return (can->state <= CAN_STATE_ERROR_PASSIVE);
}
/* reset DPRAM */
static inline void softing_set_reset_dpram(struct softing *card)
{
if (card->pdat->generation >= 2) {
spin_lock_bh(&card->spin);
iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) & ~1,
&card->dpram[DPRAM_V2_RESET]);
spin_unlock_bh(&card->spin);
}
}
static inline void softing_clr_reset_dpram(struct softing *card)
{
if (card->pdat->generation >= 2) {
spin_lock_bh(&card->spin);
iowrite8(ioread8(&card->dpram[DPRAM_V2_RESET]) | 1,
&card->dpram[DPRAM_V2_RESET]);
spin_unlock_bh(&card->spin);
}
}
/* trigger the tx queue-ing */
static netdev_tx_t softing_netdev_start_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct softing_priv *priv = netdev_priv(dev);
struct softing *card = priv->card;
int ret;
uint8_t *ptr;
uint8_t fifo_wr, fifo_rd;
struct can_frame *cf = (struct can_frame *)skb->data;
uint8_t buf[DPRAM_TX_SIZE];
if (can_dropped_invalid_skb(dev, skb))
return NETDEV_TX_OK;
spin_lock(&card->spin);
ret = NETDEV_TX_BUSY;
if (!card->fw.up ||
(card->tx.pending >= TXMAX) ||
(priv->tx.pending >= TX_ECHO_SKB_MAX))
goto xmit_done;
fifo_wr = ioread8(&card->dpram[DPRAM_TX_WR]);
fifo_rd = ioread8(&card->dpram[DPRAM_TX_RD]);
if (fifo_wr == fifo_rd)
/* fifo full */
goto xmit_done;
memset(buf, 0, sizeof(buf));
ptr = buf;
*ptr = CMD_TX;
if (cf->can_id & CAN_RTR_FLAG)
*ptr |= CMD_RTR;
if (cf->can_id & CAN_EFF_FLAG)
*ptr |= CMD_XTD;
if (priv->index)
*ptr |= CMD_BUS2;
++ptr;
*ptr++ = cf->can_dlc;
*ptr++ = (cf->can_id >> 0);
*ptr++ = (cf->can_id >> 8);
if (cf->can_id & CAN_EFF_FLAG) {
*ptr++ = (cf->can_id >> 16);
*ptr++ = (cf->can_id >> 24);
} else {
/* increment 1, not 2 as you might think */
ptr += 1;
}
if (!(cf->can_id & CAN_RTR_FLAG))
memcpy(ptr, &cf->data[0], cf->can_dlc);
memcpy_toio(&card->dpram[DPRAM_TX + DPRAM_TX_SIZE * fifo_wr],
buf, DPRAM_TX_SIZE);
if (++fifo_wr >= DPRAM_TX_CNT)
fifo_wr = 0;
iowrite8(fifo_wr, &card->dpram[DPRAM_TX_WR]);
card->tx.last_bus = priv->index;
++card->tx.pending;
++priv->tx.pending;
can_put_echo_skb(skb, dev, priv->tx.echo_put);
++priv->tx.echo_put;
if (priv->tx.echo_put >= TX_ECHO_SKB_MAX)
priv->tx.echo_put = 0;
/* can_put_echo_skb() saves the skb, safe to return TX_OK */
ret = NETDEV_TX_OK;
xmit_done:
spin_unlock(&card->spin);
if (card->tx.pending >= TXMAX) {
int j;
for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
if (card->net[j])
netif_stop_queue(card->net[j]);
}
}
if (ret != NETDEV_TX_OK)
netif_stop_queue(dev);
return ret;
}
/*
* shortcut for skb delivery
*/
int softing_netdev_rx(struct net_device *netdev, const struct can_frame *msg,
ktime_t ktime)
{
struct sk_buff *skb;
struct can_frame *cf;
skb = alloc_can_skb(netdev, &cf);
if (!skb)
return -ENOMEM;
memcpy(cf, msg, sizeof(*msg));
skb->tstamp = ktime;
return netif_rx(skb);
}
/*
* softing_handle_1
* pop 1 entry from the DPRAM queue, and process
*/
static int softing_handle_1(struct softing *card)
{
struct net_device *netdev;
struct softing_priv *priv;
ktime_t ktime;
struct can_frame msg;
int cnt = 0, lost_msg;
uint8_t fifo_rd, fifo_wr, cmd;
uint8_t *ptr;
uint32_t tmp_u32;
uint8_t buf[DPRAM_RX_SIZE];
memset(&msg, 0, sizeof(msg));
/* test for lost msgs */
lost_msg = ioread8(&card->dpram[DPRAM_RX_LOST]);
if (lost_msg) {
int j;
/* reset condition */
iowrite8(0, &card->dpram[DPRAM_RX_LOST]);
/* prepare msg */
msg.can_id = CAN_ERR_FLAG | CAN_ERR_CRTL;
msg.can_dlc = CAN_ERR_DLC;
msg.data[1] = CAN_ERR_CRTL_RX_OVERFLOW;
/*
* service to all busses, we don't know which it was applicable
* but only service busses that are online
*/
for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
netdev = card->net[j];
if (!netdev)
continue;
if (!canif_is_active(netdev))
/* a dead bus has no overflows */
continue;
++netdev->stats.rx_over_errors;
softing_netdev_rx(netdev, &msg, ktime_set(0, 0));
}
/* prepare for other use */
memset(&msg, 0, sizeof(msg));
++cnt;
}
fifo_rd = ioread8(&card->dpram[DPRAM_RX_RD]);
fifo_wr = ioread8(&card->dpram[DPRAM_RX_WR]);
if (++fifo_rd >= DPRAM_RX_CNT)
fifo_rd = 0;
if (fifo_wr == fifo_rd)
return cnt;
memcpy_fromio(buf, &card->dpram[DPRAM_RX + DPRAM_RX_SIZE*fifo_rd],
DPRAM_RX_SIZE);
mb();
/* trigger dual port RAM */
iowrite8(fifo_rd, &card->dpram[DPRAM_RX_RD]);
ptr = buf;
cmd = *ptr++;
if (cmd == 0xff)
/* not quite usefull, probably the card has got out */
return 0;
netdev = card->net[0];
if (cmd & CMD_BUS2)
netdev = card->net[1];
priv = netdev_priv(netdev);
if (cmd & CMD_ERR) {
uint8_t can_state, state;
state = *ptr++;
msg.can_id = CAN_ERR_FLAG;
msg.can_dlc = CAN_ERR_DLC;
if (state & SF_MASK_BUSOFF) {
can_state = CAN_STATE_BUS_OFF;
msg.can_id |= CAN_ERR_BUSOFF;
state = STATE_BUSOFF;
} else if (state & SF_MASK_EPASSIVE) {
can_state = CAN_STATE_ERROR_PASSIVE;
msg.can_id |= CAN_ERR_CRTL;
msg.data[1] = CAN_ERR_CRTL_TX_PASSIVE;
state = STATE_EPASSIVE;
} else {
can_state = CAN_STATE_ERROR_ACTIVE;
msg.can_id |= CAN_ERR_CRTL;
state = STATE_EACTIVE;
}
/* update DPRAM */
iowrite8(state, &card->dpram[priv->index ?
DPRAM_INFO_BUSSTATE2 : DPRAM_INFO_BUSSTATE]);
/* timestamp */
tmp_u32 = le32_to_cpup((void *)ptr);
ptr += 4;
ktime = softing_raw2ktime(card, tmp_u32);
++netdev->stats.rx_errors;
/* update internal status */
if (can_state != priv->can.state) {
priv->can.state = can_state;
if (can_state == CAN_STATE_ERROR_PASSIVE)
++priv->can.can_stats.error_passive;
else if (can_state == CAN_STATE_BUS_OFF) {
/* this calls can_close_cleanup() */
can_bus_off(netdev);
netif_stop_queue(netdev);
}
/* trigger socketcan */
softing_netdev_rx(netdev, &msg, ktime);
}
} else {
if (cmd & CMD_RTR)
msg.can_id |= CAN_RTR_FLAG;
msg.can_dlc = get_can_dlc(*ptr++);
if (cmd & CMD_XTD) {
msg.can_id |= CAN_EFF_FLAG;
msg.can_id |= le32_to_cpup((void *)ptr);
ptr += 4;
} else {
msg.can_id |= le16_to_cpup((void *)ptr);
ptr += 2;
}
/* timestamp */
tmp_u32 = le32_to_cpup((void *)ptr);
ptr += 4;
ktime = softing_raw2ktime(card, tmp_u32);
if (!(msg.can_id & CAN_RTR_FLAG))
memcpy(&msg.data[0], ptr, 8);
ptr += 8;
/* update socket */
if (cmd & CMD_ACK) {
/* acknowledge, was tx msg */
struct sk_buff *skb;
skb = priv->can.echo_skb[priv->tx.echo_get];
if (skb)
skb->tstamp = ktime;
can_get_echo_skb(netdev, priv->tx.echo_get);
++priv->tx.echo_get;
if (priv->tx.echo_get >= TX_ECHO_SKB_MAX)
priv->tx.echo_get = 0;
if (priv->tx.pending)
--priv->tx.pending;
if (card->tx.pending)
--card->tx.pending;
++netdev->stats.tx_packets;
if (!(msg.can_id & CAN_RTR_FLAG))
netdev->stats.tx_bytes += msg.can_dlc;
} else {
int ret;
ret = softing_netdev_rx(netdev, &msg, ktime);
if (ret == NET_RX_SUCCESS) {
++netdev->stats.rx_packets;
if (!(msg.can_id & CAN_RTR_FLAG))
netdev->stats.rx_bytes += msg.can_dlc;
} else {
++netdev->stats.rx_dropped;
}
}
}
++cnt;
return cnt;
}
/*
* real interrupt handler
*/
static irqreturn_t softing_irq_thread(int irq, void *dev_id)
{
struct softing *card = (struct softing *)dev_id;
struct net_device *netdev;
struct softing_priv *priv;
int j, offset, work_done;
work_done = 0;
spin_lock_bh(&card->spin);
while (softing_handle_1(card) > 0) {
++card->irq.svc_count;
++work_done;
}
spin_unlock_bh(&card->spin);
/* resume tx queue's */
offset = card->tx.last_bus;
for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
if (card->tx.pending >= TXMAX)
break;
netdev = card->net[(j + offset + 1) % card->pdat->nbus];
if (!netdev)
continue;
priv = netdev_priv(netdev);
if (!canif_is_active(netdev))
/* it makes no sense to wake dead busses */
continue;
if (priv->tx.pending >= TX_ECHO_SKB_MAX)
continue;
++work_done;
netif_wake_queue(netdev);
}
return work_done ? IRQ_HANDLED : IRQ_NONE;
}
/*
* interrupt routines:
* schedule the 'real interrupt handler'
*/
static irqreturn_t softing_irq_v2(int irq, void *dev_id)
{
struct softing *card = (struct softing *)dev_id;
uint8_t ir;
ir = ioread8(&card->dpram[DPRAM_V2_IRQ_TOHOST]);
iowrite8(0, &card->dpram[DPRAM_V2_IRQ_TOHOST]);
return (1 == ir) ? IRQ_WAKE_THREAD : IRQ_NONE;
}
static irqreturn_t softing_irq_v1(int irq, void *dev_id)
{
struct softing *card = (struct softing *)dev_id;
uint8_t ir;
ir = ioread8(&card->dpram[DPRAM_IRQ_TOHOST]);
iowrite8(0, &card->dpram[DPRAM_IRQ_TOHOST]);
return ir ? IRQ_WAKE_THREAD : IRQ_NONE;
}
/*
* netdev/candev inter-operability
*/
static int softing_netdev_open(struct net_device *ndev)
{
int ret;
/* check or determine and set bittime */
ret = open_candev(ndev);
if (!ret)
ret = softing_startstop(ndev, 1);
return ret;
}
static int softing_netdev_stop(struct net_device *ndev)
{
int ret;
netif_stop_queue(ndev);
/* softing cycle does close_candev() */
ret = softing_startstop(ndev, 0);
return ret;
}
static int softing_candev_set_mode(struct net_device *ndev, enum can_mode mode)
{
int ret;
switch (mode) {
case CAN_MODE_START:
/* softing_startstop does close_candev() */
ret = softing_startstop(ndev, 1);
return ret;
case CAN_MODE_STOP:
case CAN_MODE_SLEEP:
return -EOPNOTSUPP;
}
return 0;
}
/*
* Softing device management helpers
*/
int softing_enable_irq(struct softing *card, int enable)
{
int ret;
if (!card->irq.nr) {
return 0;
} else if (card->irq.requested && !enable) {
free_irq(card->irq.nr, card);
card->irq.requested = 0;
} else if (!card->irq.requested && enable) {
ret = request_threaded_irq(card->irq.nr,
(card->pdat->generation >= 2) ?
softing_irq_v2 : softing_irq_v1,
softing_irq_thread, IRQF_SHARED,
dev_name(&card->pdev->dev), card);
if (ret) {
dev_alert(&card->pdev->dev,
"request_threaded_irq(%u) failed\n",
card->irq.nr);
return ret;
}
card->irq.requested = 1;
}
return 0;
}
static void softing_card_shutdown(struct softing *card)
{
int fw_up = 0;
if (mutex_lock_interruptible(&card->fw.lock))
/* return -ERESTARTSYS */;
fw_up = card->fw.up;
card->fw.up = 0;
if (card->irq.requested && card->irq.nr) {
free_irq(card->irq.nr, card);
card->irq.requested = 0;
}
if (fw_up) {
if (card->pdat->enable_irq)
card->pdat->enable_irq(card->pdev, 0);
softing_set_reset_dpram(card);
if (card->pdat->reset)
card->pdat->reset(card->pdev, 1);
}
mutex_unlock(&card->fw.lock);
}
static __devinit int softing_card_boot(struct softing *card)
{
int ret, j;
static const uint8_t stream[] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, };
unsigned char back[sizeof(stream)];
if (mutex_lock_interruptible(&card->fw.lock))
return -ERESTARTSYS;
if (card->fw.up) {
mutex_unlock(&card->fw.lock);
return 0;
}
/* reset board */
if (card->pdat->enable_irq)
card->pdat->enable_irq(card->pdev, 1);
/* boot card */
softing_set_reset_dpram(card);
if (card->pdat->reset)
card->pdat->reset(card->pdev, 1);
for (j = 0; (j + sizeof(stream)) < card->dpram_size;
j += sizeof(stream)) {
memcpy_toio(&card->dpram[j], stream, sizeof(stream));
/* flush IO cache */
mb();
memcpy_fromio(back, &card->dpram[j], sizeof(stream));
if (!memcmp(back, stream, sizeof(stream)))
continue;
/* memory is not equal */
dev_alert(&card->pdev->dev, "dpram failed at 0x%04x\n", j);
ret = -EIO;
goto failed;
}
wmb();
/* load boot firmware */
ret = softing_load_fw(card->pdat->boot.fw, card, card->dpram,
card->dpram_size,
card->pdat->boot.offs - card->pdat->boot.addr);
if (ret < 0)
goto failed;
/* load loader firmware */
ret = softing_load_fw(card->pdat->load.fw, card, card->dpram,
card->dpram_size,
card->pdat->load.offs - card->pdat->load.addr);
if (ret < 0)
goto failed;
if (card->pdat->reset)
card->pdat->reset(card->pdev, 0);
softing_clr_reset_dpram(card);
ret = softing_bootloader_command(card, 0, "card boot");
if (ret < 0)
goto failed;
ret = softing_load_app_fw(card->pdat->app.fw, card);
if (ret < 0)
goto failed;
ret = softing_chip_poweron(card);
if (ret < 0)
goto failed;
card->fw.up = 1;
mutex_unlock(&card->fw.lock);
return 0;
failed:
card->fw.up = 0;
if (card->pdat->enable_irq)
card->pdat->enable_irq(card->pdev, 0);
softing_set_reset_dpram(card);
if (card->pdat->reset)
card->pdat->reset(card->pdev, 1);
mutex_unlock(&card->fw.lock);
return ret;
}
/*
* netdev sysfs
*/
static ssize_t show_channel(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct net_device *ndev = to_net_dev(dev);
struct softing_priv *priv = netdev2softing(ndev);
return sprintf(buf, "%i\n", priv->index);
}
static ssize_t show_chip(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct net_device *ndev = to_net_dev(dev);
struct softing_priv *priv = netdev2softing(ndev);
return sprintf(buf, "%i\n", priv->chip);
}
static ssize_t show_output(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct net_device *ndev = to_net_dev(dev);
struct softing_priv *priv = netdev2softing(ndev);
return sprintf(buf, "0x%02x\n", priv->output);
}
static ssize_t store_output(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct net_device *ndev = to_net_dev(dev);
struct softing_priv *priv = netdev2softing(ndev);
struct softing *card = priv->card;
unsigned long val;
int ret;
ret = strict_strtoul(buf, 0, &val);
if (ret < 0)
return ret;
val &= 0xFF;
ret = mutex_lock_interruptible(&card->fw.lock);
if (ret)
return -ERESTARTSYS;
if (netif_running(ndev)) {
mutex_unlock(&card->fw.lock);
return -EBUSY;
}
priv->output = val;
mutex_unlock(&card->fw.lock);
return count;
}
static const DEVICE_ATTR(channel, S_IRUGO, show_channel, NULL);
static const DEVICE_ATTR(chip, S_IRUGO, show_chip, NULL);
static const DEVICE_ATTR(output, S_IRUGO | S_IWUSR, show_output, store_output);
static const struct attribute *const netdev_sysfs_attrs[] = {
&dev_attr_channel.attr,
&dev_attr_chip.attr,
&dev_attr_output.attr,
NULL,
};
static const struct attribute_group netdev_sysfs_group = {
.name = NULL,
.attrs = (struct attribute **)netdev_sysfs_attrs,
};
static const struct net_device_ops softing_netdev_ops = {
.ndo_open = softing_netdev_open,
.ndo_stop = softing_netdev_stop,
.ndo_start_xmit = softing_netdev_start_xmit,
};
static const struct can_bittiming_const softing_btr_const = {
.tseg1_min = 1,
.tseg1_max = 16,
.tseg2_min = 1,
.tseg2_max = 8,
.sjw_max = 4, /* overruled */
.brp_min = 1,
.brp_max = 32, /* overruled */
.brp_inc = 1,
};
static __devinit struct net_device *softing_netdev_create(struct softing *card,
uint16_t chip_id)
{
struct net_device *netdev;
struct softing_priv *priv;
netdev = alloc_candev(sizeof(*priv), TX_ECHO_SKB_MAX);
if (!netdev) {
dev_alert(&card->pdev->dev, "alloc_candev failed\n");
return NULL;
}
priv = netdev_priv(netdev);
priv->netdev = netdev;
priv->card = card;
memcpy(&priv->btr_const, &softing_btr_const, sizeof(priv->btr_const));
priv->btr_const.brp_max = card->pdat->max_brp;
priv->btr_const.sjw_max = card->pdat->max_sjw;
priv->can.bittiming_const = &priv->btr_const;
priv->can.clock.freq = 8000000;
priv->chip = chip_id;
priv->output = softing_default_output(netdev);
SET_NETDEV_DEV(netdev, &card->pdev->dev);
netdev->flags |= IFF_ECHO;
netdev->netdev_ops = &softing_netdev_ops;
priv->can.do_set_mode = softing_candev_set_mode;
priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
return netdev;
}
static __devinit int softing_netdev_register(struct net_device *netdev)
{
int ret;
netdev->sysfs_groups[0] = &netdev_sysfs_group;
ret = register_candev(netdev);
if (ret) {
dev_alert(&netdev->dev, "register failed\n");
return ret;
}
return 0;
}
static void softing_netdev_cleanup(struct net_device *netdev)
{
unregister_candev(netdev);
free_candev(netdev);
}
/*
* sysfs for Platform device
*/
#define DEV_ATTR_RO(name, member) \
static ssize_t show_##name(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct softing *card = platform_get_drvdata(to_platform_device(dev)); \
return sprintf(buf, "%u\n", card->member); \
} \
static DEVICE_ATTR(name, 0444, show_##name, NULL)
#define DEV_ATTR_RO_STR(name, member) \
static ssize_t show_##name(struct device *dev, \
struct device_attribute *attr, char *buf) \
{ \
struct softing *card = platform_get_drvdata(to_platform_device(dev)); \
return sprintf(buf, "%s\n", card->member); \
} \
static DEVICE_ATTR(name, 0444, show_##name, NULL)
DEV_ATTR_RO(serial, id.serial);
DEV_ATTR_RO_STR(firmware, pdat->app.fw);
DEV_ATTR_RO(firmware_version, id.fw_version);
DEV_ATTR_RO_STR(hardware, pdat->name);
DEV_ATTR_RO(hardware_version, id.hw_version);
DEV_ATTR_RO(license, id.license);
DEV_ATTR_RO(frequency, id.freq);
DEV_ATTR_RO(txpending, tx.pending);
static struct attribute *softing_pdev_attrs[] = {
&dev_attr_serial.attr,
&dev_attr_firmware.attr,
&dev_attr_firmware_version.attr,
&dev_attr_hardware.attr,
&dev_attr_hardware_version.attr,
&dev_attr_license.attr,
&dev_attr_frequency.attr,
&dev_attr_txpending.attr,
NULL,
};
static const struct attribute_group softing_pdev_group = {
.name = NULL,
.attrs = softing_pdev_attrs,
};
/*
* platform driver
*/
static __devexit int softing_pdev_remove(struct platform_device *pdev)
{
struct softing *card = platform_get_drvdata(pdev);
int j;
/* first, disable card*/
softing_card_shutdown(card);
for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
if (!card->net[j])
continue;
softing_netdev_cleanup(card->net[j]);
card->net[j] = NULL;
}
sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
iounmap(card->dpram);
kfree(card);
return 0;
}
static __devinit int softing_pdev_probe(struct platform_device *pdev)
{
const struct softing_platform_data *pdat = pdev->dev.platform_data;
struct softing *card;
struct net_device *netdev;
struct softing_priv *priv;
struct resource *pres;
int ret;
int j;
if (!pdat) {
dev_warn(&pdev->dev, "no platform data\n");
return -EINVAL;
}
if (pdat->nbus > ARRAY_SIZE(card->net)) {
dev_warn(&pdev->dev, "%u nets??\n", pdat->nbus);
return -EINVAL;
}
card = kzalloc(sizeof(*card), GFP_KERNEL);
if (!card)
return -ENOMEM;
card->pdat = pdat;
card->pdev = pdev;
platform_set_drvdata(pdev, card);
mutex_init(&card->fw.lock);
spin_lock_init(&card->spin);
ret = -EINVAL;
pres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!pres)
goto platform_resource_failed;;
card->dpram_phys = pres->start;
card->dpram_size = pres->end - pres->start + 1;
card->dpram = ioremap_nocache(card->dpram_phys, card->dpram_size);
if (!card->dpram) {
dev_alert(&card->pdev->dev, "dpram ioremap failed\n");
goto ioremap_failed;
}
pres = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (pres)
card->irq.nr = pres->start;
/* reset card */
ret = softing_card_boot(card);
if (ret < 0) {
dev_alert(&pdev->dev, "failed to boot\n");
goto boot_failed;
}
/* only now, the chip's are known */
card->id.freq = card->pdat->freq;
ret = sysfs_create_group(&pdev->dev.kobj, &softing_pdev_group);
if (ret < 0) {
dev_alert(&card->pdev->dev, "sysfs failed\n");
goto sysfs_failed;
}
ret = -ENOMEM;
for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
card->net[j] = netdev =
softing_netdev_create(card, card->id.chip[j]);
if (!netdev) {
dev_alert(&pdev->dev, "failed to make can[%i]", j);
goto netdev_failed;
}
priv = netdev_priv(card->net[j]);
priv->index = j;
ret = softing_netdev_register(netdev);
if (ret) {
free_candev(netdev);
card->net[j] = NULL;
dev_alert(&card->pdev->dev,
"failed to register can[%i]\n", j);
goto netdev_failed;
}
}
dev_info(&card->pdev->dev, "%s ready.\n", card->pdat->name);
return 0;
netdev_failed:
for (j = 0; j < ARRAY_SIZE(card->net); ++j) {
if (!card->net[j])
continue;
softing_netdev_cleanup(card->net[j]);
}
sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group);
sysfs_failed:
softing_card_shutdown(card);
boot_failed:
iounmap(card->dpram);
ioremap_failed:
platform_resource_failed:
kfree(card);
return ret;
}
static struct platform_driver softing_driver = {
.driver = {
.name = "softing",
.owner = THIS_MODULE,
},
.probe = softing_pdev_probe,
.remove = __devexit_p(softing_pdev_remove),
};
MODULE_ALIAS("platform:softing");
static int __init softing_start(void)
{
return platform_driver_register(&softing_driver);
}
static void __exit softing_stop(void)
{
platform_driver_unregister(&softing_driver);
}
module_init(softing_start);
module_exit(softing_stop);
MODULE_DESCRIPTION("Softing DPRAM CAN driver");
MODULE_AUTHOR("Kurt Van Dijck <kurt.van.dijck@eia.be>");
MODULE_LICENSE("GPL v2");

40
drivers/net/can/softing/softing_platform.h Normal file
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@ -0,0 +1,40 @@
#include <linux/platform_device.h>
#ifndef _SOFTING_DEVICE_H_
#define _SOFTING_DEVICE_H_
/* softing firmware directory prefix */
#define fw_dir "softing-4.6/"
struct softing_platform_data {
unsigned int manf;
unsigned int prod;
/*
* generation
* 1st with NEC or SJA1000
* 8bit, exclusive interrupt, ...
* 2nd only SJA1000
* 16bit, shared interrupt
*/
int generation;
int nbus; /* # busses on device */
unsigned int freq; /* operating frequency in Hz */
unsigned int max_brp;
unsigned int max_sjw;
unsigned long dpram_size;
const char *name;
struct {
unsigned long offs;
unsigned long addr;
const char *fw;
} boot, load, app;
/*
* reset() function
* bring pdev in or out of reset, depending on value
*/
int (*reset)(struct platform_device *pdev, int value);
int (*enable_irq)(struct platform_device *pdev, int value);
};
#endif