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 <[email protected]> --- drivers/net/can/Kconfig | 2 + drivers/net/can/Makefile | 1 + drivers/net/can/softing/Kconfig | 16 + drivers/net/can/softing/Makefile | 5 + drivers/net/can/softing/softing.h | 216 +++++++ drivers/net/can/softing/softing_fw.c | 664 ++++++++++++++++++++ drivers/net/can/softing/softing_main.c | 935 ++++++++++++++++++++++++++++ drivers/net/can/softing/softing_platform.h | 38 ++ 8 files changed, 1877 insertions(+), 0 deletions(-) diff --git a/drivers/net/can/Kconfig b/drivers/net/can/Kconfig index d5a9db6..986195e 100644 --- a/drivers/net/can/Kconfig +++ b/drivers/net/can/Kconfig @@ -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 diff --git a/drivers/net/can/Makefile b/drivers/net/can/Makefile index 07ca159..53c82a7 100644 --- a/drivers/net/can/Makefile +++ b/drivers/net/can/Makefile @@ -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-$(CONFIG_CAN_MSCAN) += mscan/ diff --git a/drivers/net/can/softing/Kconfig b/drivers/net/can/softing/Kconfig new file mode 100644 index 0000000..072f337 --- /dev/null +++ b/drivers/net/can/softing/Kconfig @@ -0,0 +1,16 @@ +config CAN_SOFTING + tristate "Softing Gmbh CAN generic support" + depends on CAN_DEV + ---help--- + Support for CAN cards from Softing Gmbh & some cards + from Vector Gmbh. + Softing Gmbh CAN cards come with 1 or 2 physical busses. + Those cards typically use Dual Port RAM to communicate + with the host CPU. The interface is then identical for PCI + and PCMCIA cards. This driver operates on a platform device, + which has been created by softing_cs or softing_pci driver. + Warning: + The API of the card does not allow fine control per bus, but + controls the 2 busses on the card together. + As such, some actions (start/stop/busoff recovery) on 1 bus + must bring down the other bus too temporarily. diff --git a/drivers/net/can/softing/Makefile b/drivers/net/can/softing/Makefile new file mode 100644 index 0000000..7878b7b --- /dev/null +++ b/drivers/net/can/softing/Makefile @@ -0,0 +1,5 @@ + +softing-y := softing_main.o softing_fw.o +obj-$(CONFIG_CAN_SOFTING) += softing.o + +ccflags-$(CONFIG_CAN_DEBUG_DEVICES) := -DDEBUG diff --git a/drivers/net/can/softing/softing.h b/drivers/net/can/softing/softing.h new file mode 100644 index 0000000..99046a7 --- /dev/null +++ b/drivers/net/can/softing/softing.h @@ -0,0 +1,216 @@ +/* + * softing common interfaces + * + * by Kurt Van Dijck, 06-2008 + */ + +#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" + +#ifndef CAN_CTRLMODE_BERR_REPORTING +#define CAN_CTRLMODE_BERR_REPORTING 0 +#endif + +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; + u8 output; + u16 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; + struct tasklet_struct bh; + int svc_count; + } 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; + struct { + unsigned long phys; + unsigned long size; + unsigned char *virt; + unsigned char *end; + struct softing_fct *fct; + struct softing_info *info; + struct softing_rx *rx; + struct softing_tx *tx; + struct softing_irq *irq; + unsigned short *command; + unsigned short *receipt; + } dpram; + struct { + u32 serial, fw, hw, lic; + u16 chip[2]; + u32 freq; + } id; +}; + +extern int softing_default_output(struct net_device *netdev); + +extern ktime_t softing_raw2ktime(struct softing *card, u32 raw); + +extern int softing_fct_cmd(struct softing *card + , int cmd, int vector, const char *msg); + +extern int softing_bootloader_command(struct softing *card + , int command, const char *msg); + +/* reset DPRAM */ +static inline void softing_set_reset_dpram(struct softing *card) +{ + if (card->pdat->generation >= 2) { + spin_lock_bh(&card->spin); + card->dpram.virt[0xe00] &= ~1; + 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); + card->dpram.virt[0xe00] |= 1; + spin_unlock_bh(&card->spin); + } +} + +/* Load firmware after reset */ +extern int softing_load_fw(const char *file, struct softing *card, + unsigned char *virt, unsigned int size, int offset); + +/* Load final application firmware after bootloader */ +extern int softing_load_app_fw(const char *file, struct softing *card); + +extern int softing_reset_chip(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 */ +struct softing_rx { + u8 fifo[16][32]; + u8 dummy1; + u16 rd; + u16 dummy2; + u16 wr; + u16 dummy3; + u16 lost_msg; +} __attribute__((packed)); + +#define TXMAX 31 +struct softing_tx { + u8 fifo[32][16]; + u8 dummy1; + u16 rd; + u16 dummy2; + u16 wr; + u8 dummy3; +} __attribute__((packed)); + +struct softing_irq { + u8 to_host; + u8 to_card; +} __attribute__((packed)); + +struct softing_fct { + s16 param[20]; /* 0 is index */ + s16 returned; + u8 dummy; + u16 host_access; +} __attribute__((packed)); + +struct softing_info { + u8 dummy1; + u16 bus_state; + u16 dummy2; + u16 bus_state2; + u16 dummy3; + u16 error_state; + u16 dummy4; + u16 error_state2; + u16 dummy5; + u16 reset; + u16 dummy6; + u16 clear_rcv_fifo; + u16 dummy7; + u16 dummyxx; + u16 dummy8; + u16 time_reset; + u8 dummy9; + u32 time; + u32 time_wrap; + u8 wr_start; + u8 wr_end; + u8 dummy10; + u16 dummy12; + u16 dummy12x; + u16 dummy13; + u16 reset_rcv_fifo; + u8 dummy14; + u8 reset_xmt_fifo; + u8 read_fifo_levels; + u16 rcv_fifo_level; + u16 xmt_fifo_level; +} __attribute__((packed)); + +/* 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 + diff --git a/drivers/net/can/softing/softing_fw.c b/drivers/net/can/softing/softing_fw.c new file mode 100644 index 0000000..f61299c --- /dev/null +++ b/drivers/net/can/softing/softing_fw.c @@ -0,0 +1,664 @@ +/* +* drivers/net/can/softing/softing_fw.c +* +* 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" + +int softing_fct_cmd(struct softing *card, int cmd, int vector, const char *msg) +{ + int ret; + unsigned long stamp; + if (vector == RES_OK) + vector = RES_NONE; + card->dpram.fct->param[0] = cmd; + card->dpram.fct->host_access = vector; + /* be sure to flush this to the card */ + wmb(); + stamp = jiffies; + /*wait for card */ + do { + ret = card->dpram.fct->host_access; + /* don't have any cached variables */ + rmb(); + if (ret == RES_OK) { + /*don't read return-value now */ + ret = card->dpram.fct->returned; + if (ret) + dev_alert(&card->pdev->dev, + "%s returned %u\n", msg, ret); + return 0; + } + if ((jiffies - stamp) >= 1 * HZ) + break; + if (in_interrupt()) + /* go as fast as possible */ + continue; + /* process context => relax */ + schedule(); + } while (!signal_pending(current)); + + if (ret == RES_NONE) { + dev_alert(&card->pdev->dev, + "%s, no response from card on %u/0x%02x\n", + msg, cmd, vector); + return 1; + } else { + dev_alert(&card->pdev->dev, + "%s, bad response from card on %u/0x%02x, 0x%04x\n", + msg, cmd, vector, ret); + /*make sure to return something not 0 */ + return ret ? ret : 1; + } +} + +int softing_bootloader_command(struct softing *card + , int command, const char *msg) +{ + int ret; + unsigned long stamp; + card->dpram.receipt[0] = RES_NONE; + card->dpram.command[0] = command; + /* be sure to flush this to the card */ + wmb(); + stamp = jiffies; + /*wait for card */ + do { + ret = card->dpram.receipt[0]; + /* don't have any cached variables */ + rmb(); + if (ret == RES_OK) + return 0; + if ((jiffies - stamp) >= (3 * HZ)) + break; + schedule(); + } while (!signal_pending(current)); + + switch (ret) { + case RES_NONE: + dev_alert(&card->pdev->dev, "%s: no response from card\n", msg); + break; + case RES_NOK: + dev_alert(&card->pdev->dev, "%s: response from card nok\n", + msg); + break; + case RES_UNKNOWN: + dev_alert(&card->pdev->dev, "%s: command 0x%04x unknown\n", + msg, command); + break; + default: + dev_alert(&card->pdev->dev, "%s: bad response from card: %i\n", + msg, ret); + break; + } + return ret ? ret : 1; +} + +struct fw_hdr { + u16 type; + u32 addr; + u16 len; + u16 checksum; + const unsigned char *base; +} __attribute__ ((packed)); + +static int fw_parse(const unsigned char **pmem, struct fw_hdr *hdr) +{ + u16 tmp; + const unsigned char *mem; + const unsigned char *end; + mem = *pmem; + hdr->type = (mem[0] << 0) | (mem[1] << 8); + hdr->addr = (mem[2] << 0) | (mem[3] << 8) + | (mem[4] << 16) | (mem[5] << 24); + hdr->len = (mem[6] << 0) | (mem[7] << 8); + hdr->base = &mem[8]; + hdr->checksum = + (hdr->base[hdr->len] << 0) | (hdr->base[hdr->len + 1] << 8); + for (tmp = 0, mem = *pmem, end = &hdr->base[hdr->len]; mem < end; ++mem) + tmp += *mem; + if (tmp != hdr->checksum) + return -EINVAL; + *pmem += 10 + hdr->len; + return 0; +} + +int softing_load_fw(const char *file, struct softing *card, + unsigned char *virt, unsigned int size, int offset) +{ + const struct firmware *fw; + const unsigned char *mem; + const unsigned char *end; + int ret = 0; + u32 start_addr; + struct fw_hdr rec; + int ok = 0; + unsigned char buf[1024]; + + 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, "%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, &rec); + if (ret < 0) + goto fw_end; + if (rec.type != 0xffff) { + dev_alert(&card->pdev->dev, "firware starts with type 0x%04x\n", + rec.type); + goto fw_end; + } + if (strncmp("Structured Binary Format, Softing GmbH" + , rec.base, rec.len)) { + dev_info(&card->pdev->dev, "firware string '%.*s'\n", + rec.len, rec.base); + goto fw_end; + } + ok |= 1; + /* ok, we had a header */ + while (mem < end) { + ret = fw_parse(&mem, &rec); + if (ret) + break; + if (rec.type == 3) { + /*start address */ + start_addr = rec.addr; + ok |= 2; + continue; + } else if (rec.type == 1) { + /*eof */ + ok |= 4; + goto fw_end; + } else if (rec.type != 0) { + dev_alert(&card->pdev->dev, "unknown record type 0x%04x\n", + rec.type); + break; + } + + if ((rec.addr + rec.len + offset) > size) { + dev_alert(&card->pdev->dev, + "firmware out of range (0x%08x / 0x%08x)\n", + (rec.addr + rec.len + offset), size); + goto fw_end; + } + memcpy_toio(&virt[rec.addr + offset], + rec.base, rec.len); + /* be sure to flush caches from IO space */ + mb(); + if (rec.len > sizeof(buf)) { + dev_info(&card->pdev->dev, + "record is big (%u bytes), not verifying\n", + rec.len); + continue; + } + /* verify record data */ + memcpy_fromio(buf, &virt[rec.addr + offset], rec.len); + if (!memcmp(buf, rec.base, rec.len)) + /* is ok */ + continue; + dev_alert(&card->pdev->dev, "0x%08x:0x%03x at 0x%p failed\n", + rec.addr, rec.len, &virt[rec.addr + offset]); + goto fw_end; + } +fw_end: + release_firmware(fw); + if (0x5 == (ok & 0x5)) + /* got eof & start */ + return 0; + dev_info(&card->pdev->dev, "firmware %s failed\n", file); + return ret ?: -EINVAL; +} + +int softing_load_app_fw(const char *file, struct softing *card) +{ + const struct firmware *fw; + const unsigned char *mem; + const unsigned char *end; + int ret; + struct fw_hdr rec; + int ok = 0; + u32 start_addr = 0; + u16 rx_sum; + unsigned int sum; + const unsigned char *mem_lp; + const unsigned char *mem_end; + struct cpy { + u32 src; + u32 dst; + u16 len; + u8 do_cs; + } __attribute__((packed)) *pcpy = + (struct cpy *)&card->dpram.command[1]; + struct cmd { + u32 start; + u8 autorestart; + } __attribute__((packed)) *pcmdstart = + (struct cmd *)&card->dpram.command[1]; + + 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, &rec); + if (ret) + goto fw_end; + if (rec.type != 0xffff) { + dev_alert(&card->pdev->dev, "firware starts with type 0x%04x\n", + rec.type); + goto fw_end; + } + if (strncmp("Structured Binary Format, Softing GmbH" + , rec.base, rec.len)) { + dev_alert(&card->pdev->dev, "firware string '%.*s' fault\n", + rec.len, rec.base); + goto fw_end; + } + ok |= 1; + /* ok, we had a header */ + while (mem < end) { + ret = fw_parse(&mem, &rec); + if (ret) + break; + + if (rec.type == 3) { + /*start address */ + start_addr = rec.addr; + ok |= 2; + continue; + } else if (rec.type == 1) { + /*eof */ + ok |= 4; + goto fw_end; + } else if (rec.type != 0) { + dev_alert(&card->pdev->dev, "unknown record type 0x%04x\n", + rec.type); + break; + } + /* regualar data */ + for (sum = 0, mem_lp = rec.base, mem_end = &mem_lp[rec.len]; + mem_lp < mem_end; ++mem_lp) + sum += *mem_lp; + + memcpy_toio(&card->dpram. virt[card->pdat->app.offs], + rec.base, rec.len); + pcpy->src = card->pdat->app.offs + card->pdat->app.addr; + pcpy->dst = rec.addr; + pcpy->len = rec.len; + pcpy->do_cs = 1; + if (softing_bootloader_command(card, 1, "loading app.")) + goto fw_end; + /*verify checksum */ + rx_sum = card->dpram.receipt[1]; + if (rx_sum != (sum & 0xffff)) { + dev_alert(&card->pdev->dev, "SRAM seems to be damaged" + ", wanted 0x%04x, got 0x%04x\n", sum, rx_sum); + goto fw_end; + } + } +fw_end: + release_firmware(fw); + if (ok != 7) + goto fw_failed; + /*got start, start_addr, & eof */ + pcmdstart->start = start_addr; + pcmdstart->autorestart = 1; + if (softing_bootloader_command(card, 3, "start app.")) + goto fw_failed; + dev_info(&card->pdev->dev, "firmware %s up\n", file); + return 0; +fw_failed: + dev_info(&card->pdev->dev, "firmware %s failed\n", file); + return ret ?: -EINVAL; +} + +int softing_reset_chip(struct softing *card) +{ + do { + /*reset chip */ + card->dpram.info->reset_rcv_fifo = 0; + card->dpram.info->reset = 1; + if (!softing_fct_cmd(card, 0, 0, "reset_chip")) + break; + if (signal_pending(current)) + goto failed; + /*sync */ + if (softing_fct_cmd(card, 99, 0x55, "sync-a")) + goto failed; + if (softing_fct_cmd(card, 99, 0xaa, "sync-a")) + goto failed; + } while (1); + card->tx.pending = 0; + return 0; +failed: + return -EIO; +} + +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 mask_start; + int j, error_reporting; + struct can_frame msg; + + priv = netdev_priv(dev); + card = priv->card; + + if (!card->fw.up) + return -EIO; + + ret = mutex_lock_interruptible(&card->fw.lock); + if (ret) + return ret; + + mask_start = 0; + if (dev && up) + /* prepare to start this bus as well */ + mask_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) + mask_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 (!mask_start) + /* no busses to be brought up */ + goto card_done; + + if ((mask_start & 1) && (mask_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 (mask_start & 1) { + netdev = card->net[0]; + priv = netdev_priv(netdev); + error_reporting += softing_error_reporting(netdev); + /*init chip 1 */ + card->dpram.fct->param[1] = priv->can.bittiming.brp; + card->dpram.fct->param[2] = priv->can.bittiming.sjw; + card->dpram.fct->param[3] = + priv->can.bittiming.phase_seg1 + + priv->can.bittiming.prop_seg; + card->dpram.fct->param[4] = + priv->can.bittiming.phase_seg2; + card->dpram.fct->param[5] = (priv->can.ctrlmode & + CAN_CTRLMODE_3_SAMPLES) ? 1 : 0; + if (softing_fct_cmd(card, 1, 0, "initialize_chip[0]")) + goto failed; + /*set mode */ + card->dpram.fct->param[1] = 0; + card->dpram.fct->param[2] = 0; + if (softing_fct_cmd(card, 3, 0, "set_mode[0]")) + goto failed; + /*set filter */ + card->dpram.fct->param[1] = 0x0000;/*card->bus[0].s.msg; */ + card->dpram.fct->param[2] = 0x07ff;/*card->bus[0].s.msk; */ + card->dpram.fct->param[3] = 0x0000;/*card->bus[0].l.msg; */ + card->dpram.fct->param[4] = 0xffff;/*card->bus[0].l.msk; */ + card->dpram.fct->param[5] = 0x0000;/*card->bus[0].l.msg >> 16;*/ + card->dpram.fct->param[6] = 0x1fff;/*card->bus[0].l.msk >> 16;*/ + if (softing_fct_cmd(card, 7, 0, "set_filter[0]")) + goto failed; + /*set output control */ + card->dpram.fct->param[1] = priv->output; + if (softing_fct_cmd(card, 5, 0, "set_output[0]")) + goto failed; + } + if (mask_start & 2) { + netdev = card->net[1]; + priv = netdev_priv(netdev); + error_reporting += softing_error_reporting(netdev); + /*init chip2 */ + card->dpram.fct->param[1] = priv->can.bittiming.brp; + card->dpram.fct->param[2] = priv->can.bittiming.sjw; + card->dpram.fct->param[3] = + priv->can.bittiming.phase_seg1 + + priv->can.bittiming.prop_seg; + card->dpram.fct->param[4] = + priv->can.bittiming.phase_seg2; + card->dpram.fct->param[5] = (priv->can.ctrlmode & + CAN_CTRLMODE_3_SAMPLES) ? 1 : 0; + if (softing_fct_cmd(card, 2, 0, "initialize_chip[1]")) + goto failed; + /*set mode2 */ + card->dpram.fct->param[1] = 0; + card->dpram.fct->param[2] = 0; + if (softing_fct_cmd(card, 4, 0, "set_mode[1]")) + goto failed; + /*set filter2 */ + card->dpram.fct->param[1] = 0x0000;/*card->bus[1].s.msg; */ + card->dpram.fct->param[2] = 0x07ff;/*card->bus[1].s.msk; */ + card->dpram.fct->param[3] = 0x0000;/*card->bus[1].l.msg; */ + card->dpram.fct->param[4] = 0xffff;/*card->bus[1].l.msk; */ + card->dpram.fct->param[5] = 0x0000;/*card->bus[1].l.msg >> 16;*/ + card->dpram.fct->param[6] = 0x1fff;/*card->bus[1].l.msk >> 16;*/ + if (softing_fct_cmd(card, 8, 0, "set_filter[1]")) + goto failed; + /*set output control2 */ + card->dpram.fct->param[1] = priv->output; + if (softing_fct_cmd(card, 6, 0, "set_output[1]")) + goto failed; + } + /*enable_error_frame */ + if (error_reporting) { + if (softing_fct_cmd(card, 51, 0, "enable_error_frame")) + goto failed; + } + /*initialize interface */ + card->dpram.fct->param[1] = 1; + card->dpram.fct->param[2] = 1; + card->dpram.fct->param[3] = 1; + card->dpram.fct->param[4] = 1; + card->dpram.fct->param[5] = 1; + card->dpram.fct->param[6] = 1; + card->dpram.fct->param[7] = 1; + card->dpram.fct->param[8] = 1; + card->dpram.fct->param[9] = 1; + card->dpram.fct->param[10] = 1; + if (softing_fct_cmd(card, 17, 0, "initialize_interface")) + goto failed; + /*enable_fifo */ + if (softing_fct_cmd(card, 36, 0, "enable_fifo")) + goto failed; + /*enable fifo tx ack */ + if (softing_fct_cmd(card, 13, 0, "fifo_tx_ack[0]")) + goto failed; + /*enable fifo tx ack2 */ + if (softing_fct_cmd(card, 14, 0, "fifo_tx_ack[1]")) + goto failed; + /*enable timestamps */ + /*is default, no code found */ + /*start_chip */ + if (softing_fct_cmd(card, 11, 0, "start_chip")) + goto failed; + card->dpram.info->bus_state = 0; + card->dpram.info->bus_state2 = 0; + dev_info(&card->pdev->dev, "%s up\n", __func__); + if (card->pdat->generation < 2) { + card->dpram.irq->to_host = 0; + /* 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 (!(mask_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; +failed: + dev_alert(&card->pdev->dev, "firmware failed, going idle\n"); +invalid: + 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 -EIO; +} + +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: + if (card->pdat->generation < 2) + return 0xfb; + return 0xfa; + case 5: + return 0x60; + default: + return 0x40; + } +} + diff --git a/drivers/net/can/softing/softing_main.c b/drivers/net/can/softing/softing_main.c new file mode 100644 index 0000000..a3d94d4 --- /dev/null +++ b/drivers/net/can/softing/softing_main.c @@ -0,0 +1,935 @@ +/* +* drivers/net/can/softing/softing_main.c +* +* 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/2) + +/* + * 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); +} + +/* 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; + int bhlock; + u8 *ptr; + u8 cmd; + unsigned int fifo_wr; + struct can_frame msg; + + if (can_dropped_invalid_skb(dev, skb)) + return NETDEV_TX_OK; + + if (in_interrupt()) { + bhlock = 0; + spin_lock(&card->spin); + } else { + bhlock = 1; + spin_lock_bh(&card->spin); + } + ret = NETDEV_TX_BUSY; + if (!card->fw.up) + goto xmit_done; + if (card->tx.pending >= TXMAX) + goto xmit_done; + if (priv->tx.pending >= TX_ECHO_SKB_MAX) + goto xmit_done; + fifo_wr = card->dpram.tx->wr; + if (fifo_wr == card->dpram.tx->rd) + /*fifo full */ + goto xmit_done; + memcpy(&msg, skb->data, sizeof(msg)); + ptr = &card->dpram.tx->fifo[fifo_wr][0]; + cmd = CMD_TX; + if (msg.can_id & CAN_RTR_FLAG) + cmd |= CMD_RTR; + if (msg.can_id & CAN_EFF_FLAG) + cmd |= CMD_XTD; + if (priv->index) + cmd |= CMD_BUS2; + *ptr++ = cmd; + *ptr++ = msg.can_dlc; + *ptr++ = (msg.can_id >> 0); + *ptr++ = (msg.can_id >> 8); + if (msg.can_id & CAN_EFF_FLAG) { + *ptr++ = (msg.can_id >> 16); + *ptr++ = (msg.can_id >> 24); + } else { + /*increment 1, not 2 as you might think */ + ptr += 1; + } + if (!(msg.can_id & CAN_RTR_FLAG)) + memcpy_toio(ptr, &msg.data[0], msg.can_dlc); + if (++fifo_wr >= + sizeof(card->dpram.tx->fifo) / + sizeof(card->dpram.tx->fifo[0])) + fifo_wr = 0; + card->dpram.tx->wr = fifo_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: + if (bhlock) + spin_unlock_bh(&card->spin); + else + 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; + int ret; + + skb = alloc_can_skb(netdev, &cf); + if (!skb) + return -ENOMEM; + memcpy(cf, msg, sizeof(*msg)); + skb->tstamp = ktime; + ret = netif_rx(skb); + if (ret == NET_RX_DROP) + ++netdev->stats.rx_dropped; + return ret; +} + +/* + * softing_handle_1 + * pop 1 entry from the DPRAM queue, and process + */ +static int softing_handle_1(struct softing *card) +{ + int j; + struct net_device *netdev; + struct softing_priv *priv; + ktime_t ktime; + struct can_frame msg; + + unsigned int fifo_rd; + unsigned int cnt = 0; + u8 *ptr; + u32 tmp; + u8 cmd; + + memset(&msg, 0, sizeof(msg)); + if (card->dpram.rx->lost_msg) { + /*reset condition */ + card->dpram.rx->lost_msg = 0; + /* 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 = card->dpram.rx->rd; + if (++fifo_rd >= ARRAY_SIZE(card->dpram.rx->fifo)) + fifo_rd = 0; + + if (card->dpram.rx->wr == fifo_rd) + return cnt; + + ptr = &card->dpram.rx->fifo[fifo_rd][0]; + + cmd = *ptr++; + if (cmd == 0xff) { + /*not quite usefull, probably the card has got out */ + dev_alert(&card->pdev->dev, "got cmd 0x%02x," + " I suspect the card is lost\n", cmd); + } + /*mod_trace("0x%02x", cmd);*/ + netdev = card->net[0]; + if (cmd & CMD_BUS2) + netdev = card->net[1]; + priv = netdev_priv(netdev); + + if (cmd & CMD_ERR) { + u8 can_state; + u8 state; + state = *ptr++; + + msg.can_id = CAN_ERR_FLAG; + msg.can_dlc = CAN_ERR_DLC; + + if (state & 0x80) { + can_state = CAN_STATE_BUS_OFF; + msg.can_id |= CAN_ERR_BUSOFF; + state = 2; + } else if (state & 0x60) { + can_state = CAN_STATE_ERROR_PASSIVE; + msg.can_id |= CAN_ERR_BUSERROR; + msg.data[1] = CAN_ERR_CRTL_TX_PASSIVE; + state = 1; + } else { + can_state = CAN_STATE_ERROR_ACTIVE; + state = 0; + msg.can_id |= CAN_ERR_BUSERROR; + } + /*update DPRAM */ + if (!priv->index) + card->dpram.info->bus_state = state; + else + card->dpram.info->bus_state2 = state; + /*timestamp */ + tmp = (ptr[0] << 0) | (ptr[1] << 8) + | (ptr[2] << 16) | (ptr[3] << 24); + ptr += 4; + ktime = softing_raw2ktime(card, tmp); + /*trigger dual port RAM */ + mb(); + card->dpram.rx->rd = fifo_rd; + + ++priv->can.can_stats.bus_error; + ++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; + 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; + /* acknowledge, was tx msg + * no real tx flag to set + if (cmd & CMD_ACK) { + } + */ + msg.can_dlc = get_can_dlc(*ptr++); + if (cmd & CMD_XTD) { + msg.can_id |= CAN_EFF_FLAG; + msg.can_id |= (ptr[0] << 0) | (ptr[1] << 8) + | (ptr[2] << 16) | (ptr[3] << 24); + ptr += 4; + } else { + msg.can_id |= (ptr[0] << 0) | (ptr[1] << 8); + ptr += 2; + } + tmp = (ptr[0] << 0) | (ptr[1] << 8) + | (ptr[2] << 16) | (ptr[3] << 24); + ptr += 4; + ktime = softing_raw2ktime(card, tmp); + memcpy_fromio(&msg.data[0], ptr, 8); + ptr += 8; + /*trigger dual port RAM */ + mb(); + card->dpram.rx->rd = fifo_rd; + /*update socket */ + if (cmd & CMD_ACK) { + 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; + netdev->stats.tx_bytes += msg.can_dlc; + } else { + ++netdev->stats.rx_packets; + netdev->stats.rx_bytes += msg.can_dlc; + softing_netdev_rx(netdev, &msg, ktime); + } + } + ++cnt; + return cnt; +} + +/* + * real interrupt handler + */ +static void softing_handler(unsigned long param) +{ + struct softing *card = (struct softing *)param; + struct net_device *netdev; + struct softing_priv *priv; + int j; + int offset; + + spin_lock(&card->spin); + while (softing_handle_1(card) > 0) + ++card->irq.svc_count; + spin_unlock(&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; + netif_wake_queue(netdev); + } +} + +/* + * interrupt routines: + * schedule the 'real interrupt handler' + */ +static +irqreturn_t softing_irq_new(int irq, void *dev_id) +{ + struct softing *card = (struct softing *)dev_id; + unsigned char ir; + ir = card->dpram.virt[0xe02]; + card->dpram.virt[0xe02] = 0; + if (card->dpram.rx->rd == 0xffff) { + dev_alert(&card->pdev->dev, "I think the card is gone\n"); + return IRQ_NONE; + } + if (ir == 1) { + tasklet_schedule(&card->irq.bh); + return IRQ_HANDLED; + } else if (ir == 0x10) { + return IRQ_NONE; + } else { + return IRQ_NONE; + } +} + +static +irqreturn_t softing_irq_old(int irq, void *dev_id) +{ + struct softing *card = (struct softing *)dev_id; + unsigned char irq_host; + irq_host = card->dpram.irq->to_host; + /* make sure we have a copy, before clearing the variable in DPRAM */ + rmb(); + card->dpram.irq->to_host = 0; + /* make sure we cleared it */ + wmb(); + if (card->dpram.rx->rd == 0xffff) { + dev_alert(&card->pdev->dev, "I think the card is gone\n"); + return IRQ_NONE; + } + tasklet_schedule(&card->irq.bh); + return IRQ_HANDLED; +} + +/* + * 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) + goto failed; + ret = softing_startstop(ndev, 1); + if (ret) + goto failed; + return 0; +failed: + 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 cycle 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 (!enable) { + if (card->irq.requested && card->irq.nr) { + free_irq(card->irq.nr, card); + card->irq.requested = 0; + } + return 0; + } + if (!card->irq.requested && (card->irq.nr)) { + ret = request_irq(card->irq.nr, + (card->pdat->generation >= 2) + ? softing_irq_new : softing_irq_old, + IRQF_SHARED, dev_name(&card->pdev->dev), card); + if (ret) { + dev_alert(&card->pdev->dev, "%s, request_irq(%u) failed\n", + card->pdat->name, card->irq.nr); + return ret; + } + card->irq.requested = 1; + } + return 0; +} + +static void softing_card_shutdown(struct softing *card) +{ + int fw_up = 0; + dev_dbg(&card->pdev->dev, "%s()\n", __func__); + 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); + tasklet_kill(&card->irq.bh); +} + +static int softing_card_boot(struct softing *card) +{ + unsigned char *lp; + static const unsigned char stream[] = { + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, }; + unsigned char back[sizeof(stream)]; + dev_dbg(&card->pdev->dev, "%s()\n", __func__); + + 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 (lp = card->dpram.virt; &lp[sizeof(stream)] <= card->dpram.end; + lp += sizeof(stream)) { + + memcpy_toio(lp, stream, sizeof(stream)); + /* flush IO cache */ + mb(); + memcpy_fromio(back, lp, sizeof(stream)); + + if (!memcmp(back, stream, sizeof(stream))) + continue; + /* memory is not equal */ + dev_alert(&card->pdev->dev, "write to dpram failed at 0x%04lx\n", + (unsigned long)(lp - card->dpram.virt)); + goto open_failed; + } + wmb(); + /*load boot firmware */ + if (softing_load_fw(card->pdat->boot.fw, card, card->dpram.virt, + card->dpram.size, + card->pdat->boot.offs - + card->pdat->boot.addr)) + goto open_failed; + /*load load firmware */ + if (softing_load_fw(card->pdat->load.fw, card, card->dpram.virt, + card->dpram.size, + card->pdat->load.offs - + card->pdat->load.addr)) + goto open_failed; + + if (card->pdat->reset) + card->pdat->reset(card->pdev, 0); + softing_clr_reset_dpram(card); + if (softing_bootloader_command(card, 0, "card boot")) + goto open_failed; + if (softing_load_app_fw(card->pdat->app.fw, card)) + goto open_failed; + /*reset chip */ + card->dpram.info->reset_rcv_fifo = 0; + card->dpram.info->reset = 1; + /*sync */ + if (softing_fct_cmd(card, 99, 0x55, "sync-a")) + goto open_failed; + if (softing_fct_cmd(card, 99, 0xaa, "sync-a")) + goto open_failed; + /*reset chip */ + if (softing_fct_cmd(card, 0, 0, "reset_chip")) + goto open_failed; + /*get_serial */ + if (softing_fct_cmd(card, 43, 0, "get_serial_number")) + goto open_failed; + card->id.serial = + (u16) card->dpram.fct->param[1] + + (((u16) card->dpram.fct->param[2]) << 16); + /*get_version */ + if (softing_fct_cmd(card, 12, 0, "get_version")) + goto open_failed; + card->id.fw = (u16) card->dpram.fct->param[1]; + card->id.hw = (u16) card->dpram.fct->param[2]; + card->id.lic = (u16) card->dpram.fct->param[3]; + card->id.chip[0] = (u16) card->dpram.fct->param[4]; + card->id.chip[1] = (u16) card->dpram.fct->param[5]; + + dev_info(&card->pdev->dev, "card booted, type %s, " + "serial %u, fw %u, hw %u, lic %u, chip (%u,%u)\n", + card->pdat->name, card->id.serial, card->id.fw, card->id.hw, + card->id.lic, card->id.chip[0], card->id.chip[1]); + + card->fw.up = 1; + mutex_unlock(&card->fw.lock); + return 0; +open_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 -EIO; +} + +/* + * 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, 0); +static const DEVICE_ATTR(chip, S_IRUGO, show_chip, 0); +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, + 0, +}; +static const struct attribute_group netdev_sysfs_group = { + .name = 0, + .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 struct net_device *softing_netdev_create( + struct softing *card, u16 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 0; + } + 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 | + CAN_CTRLMODE_BERR_REPORTING; + + return netdev; +} + +static int softing_netdev_register(struct net_device *netdev) +{ + int ret; + + /* + * provide bus-specific sysfs attributes _during_ the uevent + */ + 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, 0) + +DEV_ATTR_RO(serial , id.serial); +DEV_ATTR_RO(firmware , id.fw); +DEV_ATTR_RO(hardware , id.hw); +DEV_ATTR_RO(license , id.lic); +DEV_ATTR_RO(freq , id.freq); +DEV_ATTR_RO(txpending , tx.pending); + +static struct attribute *softing_pdev_attrs[] = { + &dev_attr_serial.attr, + &dev_attr_firmware.attr, + &dev_attr_hardware.attr, + &dev_attr_license.attr, + &dev_attr_freq.attr, + &dev_attr_txpending.attr, + 0, +}; + +static const struct attribute_group softing_pdev_group = { + .attrs = softing_pdev_attrs, +}; + +/* + * platform driver + */ +static int softing_pdev_remove(struct platform_device *pdev) +{ + struct softing *card = platform_get_drvdata(pdev); + int j; + + /*first, disable card*/ + softing_card_shutdown(card); + tasklet_kill(&card->irq.bh); + + for (j = 0; j < ARRAY_SIZE(card->net); ++j) { + if (!card->net[j]) + continue; + softing_netdev_cleanup(card->net[j]); + card->net[j] = 0; + } + sysfs_remove_group(&pdev->dev.kobj, &softing_pdev_group); + + iounmap(card->dpram.virt); + kfree(card); + return 0; +} + +static 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); + /* try_module_get(THIS_MODULE); */ + mutex_init(&card->fw.lock); + spin_lock_init(&card->spin); + tasklet_init(&card->irq.bh, softing_handler, (unsigned long)card); + + ret = -EINVAL; + pres = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!pres) + goto ioremap_failed; + card->dpram.phys = pres->start; + card->dpram.size = pres->end - pres->start + 1; + card->dpram.virt = ioremap_nocache(card->dpram.phys, card->dpram.size); + if (!card->dpram.virt) { + dev_alert(&card->pdev->dev, "dpram ioremap failed\n"); + goto ioremap_failed; + } + card->dpram.end = &card->dpram.virt[card->dpram.size]; + /*initialize_board */ + card->dpram.rx = (struct softing_rx *)&card->dpram.virt[0x0000]; + card->dpram.tx = (struct softing_tx *)&card->dpram.virt[0x0400]; + card->dpram.fct = (struct softing_fct *)&card->dpram.virt[0x0300]; + card->dpram.info = (struct softing_info *)&card->dpram.virt[0x0330]; + card->dpram.command = (unsigned short *)&card->dpram.virt[0x07e0]; + card->dpram.receipt = (unsigned short *)&card->dpram.virt[0x07f0]; + card->dpram.irq = (struct softing_irq *)&card->dpram.virt[0x07fe]; + + pres = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + if (pres) + card->irq.nr = pres->start; + + /*reset card */ + ret = -EIO; + if (softing_card_boot(card)) { + dev_alert(&pdev->dev, "failed to boot\n"); + goto boot_failed; + } + + /*only now, the chip's are known */ + card->id.freq = card->pdat->freq * 1000000UL; + + 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] = 0; + dev_alert(&card->pdev->dev, + "failed to register can[%i]\n", j); + goto netdev_failed; + } + } + dev_info(&card->pdev->dev, "card initialised\n"); + 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.virt); +ioremap_failed: + tasklet_kill(&card->irq.bh); + kfree(card); + return ret; +} + +static struct platform_driver softing_driver = { + .driver = { + .name = "softing", + .owner = THIS_MODULE, + }, + .probe = softing_pdev_probe, + .remove = 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("socketcan softing driver"); +MODULE_AUTHOR("Kurt Van Dijck <[email protected]>"); +MODULE_LICENSE("GPL"); diff --git a/drivers/net/can/softing/softing_platform.h b/drivers/net/can/softing/softing_platform.h new file mode 100644 index 0000000..9ff69a1 --- /dev/null +++ b/drivers/net/can/softing/softing_platform.h @@ -0,0 +1,38 @@ + +#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 SJA11000 + * 16bit, shared interrupt + */ + int generation; + int nbus; /* # busses on device */ + unsigned int freq; /* crystal in MHz */ + unsigned int max_brp; + unsigned int max_sjw; + unsigned long dpram_size; + char name[32]; + 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 + _______________________________________________ Socketcan-core mailing list [email protected] https://lists.berlios.de/mailman/listinfo/socketcan-core
