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linux-next/drivers/net/can/sja1000/peak_pci.c
Linus Torvalds a0b1c42951 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 
Pull networking update from David Miller:

 1) Checkpoint/restarted TCP sockets now can properly propagate the TCP
    timestamp offset.  From Andrey Vagin.

 2) VMWARE VM VSOCK layer, from Andy King.

 3) Much improved support for virtual functions and SR-IOV in bnx2x,
    from Ariel ELior.

 4) All protocols on ipv4 and ipv6 are now network namespace aware, and
    all the compatability checks for initial-namespace-only protocols is
    removed.  Thanks to Tom Parkin for helping deal with the last major
    holdout, L2TP.

 5) IPV6 support in netpoll and network namespace support in pktgen,
    from Cong Wang.

 6) Multiple Registration Protocol (MRP) and Multiple VLAN Registration
    Protocol (MVRP) support, from David Ward.

 7) Compute packet lengths more accurately in the packet scheduler, from
    Eric Dumazet.

 8) Use per-task page fragment allocator in skb_append_datato_frags(),
    also from Eric Dumazet.

 9) Add support for connection tracking labels in netfilter, from
    Florian Westphal.

10) Fix default multicast group joining on ipv6, and add anti-spoofing
    checks to 6to4 and 6rd.  From Hannes Frederic Sowa.

11) Make ipv4/ipv6 fragmentation memory limits more reasonable in modern
    times, rearrange inet frag datastructures for better cacheline
    locality, and move more operations outside of locking.  From Jesper
    Dangaard Brouer.

12) Instead of strict master <--> slave relationships, allow arbitrary
    scenerios with "upper device lists".  From Jiri Pirko.

13) Improve rate limiting accuracy in TBF and act_police, also from Jiri
    Pirko.

14) Add a BPF filter netfilter match target, from Willem de Bruijn.

15) Orphan and delete a bunch of pre-historic networking drivers from
    Paul Gortmaker.

16) Add TSO support for GRE tunnels, from Pravin B SHelar.  Although
    this still needs some minor bug fixing before it's %100 correct in
    all cases.

17) Handle unresolved IPSEC states like ARP, with a resolution packet
    queue.  From Steffen Klassert.

18) Remove TCP Appropriate Byte Count support (ABC), from Stephen
    Hemminger.  This was long overdue.

19) Support SO_REUSEPORT, from Tom Herbert.

20) Allow locking a socket BPF filter, so that it cannot change after a
    process drops capabilities.

21) Add VLAN filtering to bridge, from Vlad Yasevich.

22) Bring ipv6 on-par with ipv4 and do not cache neighbour entries in
    the ipv6 routes, from YOSHIFUJI Hideaki.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1538 commits)
  ipv6: fix race condition regarding dst->expires and dst->from.
  net: fix a wrong assignment in skb_split()
  ip_gre: remove an extra dst_release()
  ppp: set qdisc_tx_busylock to avoid LOCKDEP splat
  atl1c: restore buffer state
  net: fix a build failure when !CONFIG_PROC_FS
  net: ipv4: fix waring -Wunused-variable
  net: proc: fix build failed when procfs is not configured
  Revert "xen: netback: remove redundant xenvif_put"
  net: move procfs code to net/core/net-procfs.c
  qmi_wwan, cdc-ether: add ADU960S
  bonding: set sysfs device_type to 'bond'
  bonding: fix bond_release_all inconsistencies
  b44: use netdev_alloc_skb_ip_align()
  xen: netback: remove redundant xenvif_put
  net: fec: Do a sanity check on the gpio number
  ip_gre: propogate target device GSO capability to the tunnel device
  ip_gre: allow CSUM capable devices to handle packets
  bonding: Fix initialize after use for 3ad machine state spinlock
  bonding: Fix race condition between bond_enslave() and bond_3ad_update_lacp_rate()
  ...
2013-02-20 18:58:50 -08:00

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/*
* Copyright (C) 2007, 2011 Wolfgang Grandegger <wg@grandegger.com>
* Copyright (C) 2012 Stephane Grosjean <s.grosjean@peak-system.com>
*
* Derived from the PCAN project file driver/src/pcan_pci.c:
*
* Copyright (C) 2001-2006 PEAK System-Technik GmbH
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/io.h>
#include <linux/i2c.h>
#include <linux/i2c-algo-bit.h>
#include <linux/can.h>
#include <linux/can/dev.h>
#include "sja1000.h"
MODULE_AUTHOR("Stephane Grosjean <s.grosjean@peak-system.com>");
MODULE_DESCRIPTION("Socket-CAN driver for PEAK PCAN PCI family cards");
MODULE_SUPPORTED_DEVICE("PEAK PCAN PCI/PCIe/PCIeC miniPCI CAN cards");
MODULE_SUPPORTED_DEVICE("PEAK PCAN miniPCIe/cPCI PC/104+ PCI/104e CAN Cards");
MODULE_LICENSE("GPL v2");
#define DRV_NAME "peak_pci"
struct peak_pciec_card;
struct peak_pci_chan {
void __iomem *cfg_base; /* Common for all channels */
struct net_device *prev_dev; /* Chain of network devices */
u16 icr_mask; /* Interrupt mask for fast ack */
struct peak_pciec_card *pciec_card; /* only for PCIeC LEDs */
};
#define PEAK_PCI_CAN_CLOCK (16000000 / 2)
#define PEAK_PCI_CDR (CDR_CBP | CDR_CLKOUT_MASK)
#define PEAK_PCI_OCR OCR_TX0_PUSHPULL
/*
* Important PITA registers
*/
#define PITA_ICR 0x00 /* Interrupt control register */
#define PITA_GPIOICR 0x18 /* GPIO interface control register */
#define PITA_MISC 0x1C /* Miscellaneous register */
#define PEAK_PCI_CFG_SIZE 0x1000 /* Size of the config PCI bar */
#define PEAK_PCI_CHAN_SIZE 0x0400 /* Size used by the channel */
#define PEAK_PCI_VENDOR_ID 0x001C /* The PCI device and vendor IDs */
#define PEAK_PCI_DEVICE_ID 0x0001 /* for PCI/PCIe slot cards */
#define PEAK_PCIEC_DEVICE_ID 0x0002 /* for ExpressCard slot cards */
#define PEAK_PCIE_DEVICE_ID 0x0003 /* for nextgen PCIe slot cards */
#define PEAK_CPCI_DEVICE_ID 0x0004 /* for nextgen cPCI slot cards */
#define PEAK_MPCI_DEVICE_ID 0x0005 /* for nextgen miniPCI slot cards */
#define PEAK_PC_104P_DEVICE_ID 0x0006 /* PCAN-PC/104+ cards */
#define PEAK_PCI_104E_DEVICE_ID 0x0007 /* PCAN-PCI/104 Express cards */
#define PEAK_MPCIE_DEVICE_ID 0x0008 /* The miniPCIe slot cards */
#define PEAK_PCI_CHAN_MAX 4
static const u16 peak_pci_icr_masks[PEAK_PCI_CHAN_MAX] = {
0x02, 0x01, 0x40, 0x80
};
static DEFINE_PCI_DEVICE_TABLE(peak_pci_tbl) = {
{PEAK_PCI_VENDOR_ID, PEAK_PCI_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
{PEAK_PCI_VENDOR_ID, PEAK_PCIE_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
{PEAK_PCI_VENDOR_ID, PEAK_MPCI_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
{PEAK_PCI_VENDOR_ID, PEAK_MPCIE_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
{PEAK_PCI_VENDOR_ID, PEAK_PC_104P_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
{PEAK_PCI_VENDOR_ID, PEAK_PCI_104E_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
{PEAK_PCI_VENDOR_ID, PEAK_CPCI_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
#ifdef CONFIG_CAN_PEAK_PCIEC
{PEAK_PCI_VENDOR_ID, PEAK_PCIEC_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,},
#endif
{0,}
};
MODULE_DEVICE_TABLE(pci, peak_pci_tbl);
#ifdef CONFIG_CAN_PEAK_PCIEC
/*
* PCAN-ExpressCard needs I2C bit-banging configuration option.
*/
/* GPIOICR byte access offsets */
#define PITA_GPOUT 0x18 /* GPx output value */
#define PITA_GPIN 0x19 /* GPx input value */
#define PITA_GPOEN 0x1A /* configure GPx as ouput pin */
/* I2C GP bits */
#define PITA_GPIN_SCL 0x01 /* Serial Clock Line */
#define PITA_GPIN_SDA 0x04 /* Serial DAta line */
#define PCA9553_1_SLAVEADDR (0xC4 >> 1)
/* PCA9553 LS0 fields values */
enum {
PCA9553_LOW,
PCA9553_HIGHZ,
PCA9553_PWM0,
PCA9553_PWM1
};
/* LEDs control */
#define PCA9553_ON PCA9553_LOW
#define PCA9553_OFF PCA9553_HIGHZ
#define PCA9553_SLOW PCA9553_PWM0
#define PCA9553_FAST PCA9553_PWM1
#define PCA9553_LED(c) (1 << (c))
#define PCA9553_LED_STATE(s, c) ((s) << ((c) << 1))
#define PCA9553_LED_ON(c) PCA9553_LED_STATE(PCA9553_ON, c)
#define PCA9553_LED_OFF(c) PCA9553_LED_STATE(PCA9553_OFF, c)
#define PCA9553_LED_SLOW(c) PCA9553_LED_STATE(PCA9553_SLOW, c)
#define PCA9553_LED_FAST(c) PCA9553_LED_STATE(PCA9553_FAST, c)
#define PCA9553_LED_MASK(c) PCA9553_LED_STATE(0x03, c)
#define PCA9553_LED_OFF_ALL (PCA9553_LED_OFF(0) | PCA9553_LED_OFF(1))
#define PCA9553_LS0_INIT 0x40 /* initial value (!= from 0x00) */
struct peak_pciec_chan {
struct net_device *netdev;
unsigned long prev_rx_bytes;
unsigned long prev_tx_bytes;
};
struct peak_pciec_card {
void __iomem *cfg_base; /* Common for all channels */
void __iomem *reg_base; /* first channel base address */
u8 led_cache; /* leds state cache */
/* PCIExpressCard i2c data */
struct i2c_algo_bit_data i2c_bit;
struct i2c_adapter led_chip;
struct delayed_work led_work; /* led delayed work */
int chan_count;
struct peak_pciec_chan channel[PEAK_PCI_CHAN_MAX];
};
/* "normal" pci register write callback is overloaded for leds control */
static void peak_pci_write_reg(const struct sja1000_priv *priv,
int port, u8 val);
static inline void pita_set_scl_highz(struct peak_pciec_card *card)
{
u8 gp_outen = readb(card->cfg_base + PITA_GPOEN) & ~PITA_GPIN_SCL;
writeb(gp_outen, card->cfg_base + PITA_GPOEN);
}
static inline void pita_set_sda_highz(struct peak_pciec_card *card)
{
u8 gp_outen = readb(card->cfg_base + PITA_GPOEN) & ~PITA_GPIN_SDA;
writeb(gp_outen, card->cfg_base + PITA_GPOEN);
}
static void peak_pciec_init_pita_gpio(struct peak_pciec_card *card)
{
/* raise SCL & SDA GPIOs to high-Z */
pita_set_scl_highz(card);
pita_set_sda_highz(card);
}
static void pita_setsda(void *data, int state)
{
struct peak_pciec_card *card = (struct peak_pciec_card *)data;
u8 gp_out, gp_outen;
/* set output sda always to 0 */
gp_out = readb(card->cfg_base + PITA_GPOUT) & ~PITA_GPIN_SDA;
writeb(gp_out, card->cfg_base + PITA_GPOUT);
/* control output sda with GPOEN */
gp_outen = readb(card->cfg_base + PITA_GPOEN);
if (state)
gp_outen &= ~PITA_GPIN_SDA;
else
gp_outen |= PITA_GPIN_SDA;
writeb(gp_outen, card->cfg_base + PITA_GPOEN);
}
static void pita_setscl(void *data, int state)
{
struct peak_pciec_card *card = (struct peak_pciec_card *)data;
u8 gp_out, gp_outen;
/* set output scl always to 0 */
gp_out = readb(card->cfg_base + PITA_GPOUT) & ~PITA_GPIN_SCL;
writeb(gp_out, card->cfg_base + PITA_GPOUT);
/* control output scl with GPOEN */
gp_outen = readb(card->cfg_base + PITA_GPOEN);
if (state)
gp_outen &= ~PITA_GPIN_SCL;
else
gp_outen |= PITA_GPIN_SCL;
writeb(gp_outen, card->cfg_base + PITA_GPOEN);
}
static int pita_getsda(void *data)
{
struct peak_pciec_card *card = (struct peak_pciec_card *)data;
/* set tristate */
pita_set_sda_highz(card);
return (readb(card->cfg_base + PITA_GPIN) & PITA_GPIN_SDA) ? 1 : 0;
}
static int pita_getscl(void *data)
{
struct peak_pciec_card *card = (struct peak_pciec_card *)data;
/* set tristate */
pita_set_scl_highz(card);
return (readb(card->cfg_base + PITA_GPIN) & PITA_GPIN_SCL) ? 1 : 0;
}
/*
* write commands to the LED chip though the I2C-bus of the PCAN-PCIeC
*/
static int peak_pciec_write_pca9553(struct peak_pciec_card *card,
u8 offset, u8 data)
{
u8 buffer[2] = {
offset,
data
};
struct i2c_msg msg = {
.addr = PCA9553_1_SLAVEADDR,
.len = 2,
.buf = buffer,
};
int ret;
/* cache led mask */
if ((offset == 5) && (data == card->led_cache))
return 0;
ret = i2c_transfer(&card->led_chip, &msg, 1);
if (ret < 0)
return ret;
if (offset == 5)
card->led_cache = data;
return 0;
}
/*
* delayed work callback used to control the LEDs
*/
static void peak_pciec_led_work(struct work_struct *work)
{
struct peak_pciec_card *card =
container_of(work, struct peak_pciec_card, led_work.work);
struct net_device *netdev;
u8 new_led = card->led_cache;
int i, up_count = 0;
/* first check what is to do */
for (i = 0; i < card->chan_count; i++) {
/* default is: not configured */
new_led &= ~PCA9553_LED_MASK(i);
new_led |= PCA9553_LED_ON(i);
netdev = card->channel[i].netdev;
if (!netdev || !(netdev->flags & IFF_UP))
continue;
up_count++;
/* no activity (but configured) */
new_led &= ~PCA9553_LED_MASK(i);
new_led |= PCA9553_LED_SLOW(i);
/* if bytes counters changed, set fast blinking led */
if (netdev->stats.rx_bytes != card->channel[i].prev_rx_bytes) {
card->channel[i].prev_rx_bytes = netdev->stats.rx_bytes;
new_led &= ~PCA9553_LED_MASK(i);
new_led |= PCA9553_LED_FAST(i);
}
if (netdev->stats.tx_bytes != card->channel[i].prev_tx_bytes) {
card->channel[i].prev_tx_bytes = netdev->stats.tx_bytes;
new_led &= ~PCA9553_LED_MASK(i);
new_led |= PCA9553_LED_FAST(i);
}
}
/* check if LS0 settings changed, only update i2c if so */
peak_pciec_write_pca9553(card, 5, new_led);
/* restart timer (except if no more configured channels) */
if (up_count)
schedule_delayed_work(&card->led_work, HZ);
}
/*
* set LEDs blinking state
*/
static void peak_pciec_set_leds(struct peak_pciec_card *card, u8 led_mask, u8 s)
{
u8 new_led = card->led_cache;
int i;
/* first check what is to do */
for (i = 0; i < card->chan_count; i++)
if (led_mask & PCA9553_LED(i)) {
new_led &= ~PCA9553_LED_MASK(i);
new_led |= PCA9553_LED_STATE(s, i);
}
/* check if LS0 settings changed, only update i2c if so */
peak_pciec_write_pca9553(card, 5, new_led);
}
/*
* start one second delayed work to control LEDs
*/
static void peak_pciec_start_led_work(struct peak_pciec_card *card)
{
schedule_delayed_work(&card->led_work, HZ);
}
/*
* stop LEDs delayed work
*/
static void peak_pciec_stop_led_work(struct peak_pciec_card *card)
{
cancel_delayed_work_sync(&card->led_work);
}
/*
* initialize the PCA9553 4-bit I2C-bus LED chip
*/
static int peak_pciec_init_leds(struct peak_pciec_card *card)
{
int err;
/* prescaler for frequency 0: "SLOW" = 1 Hz = "44" */
err = peak_pciec_write_pca9553(card, 1, 44 / 1);
if (err)
return err;
/* duty cycle 0: 50% */
err = peak_pciec_write_pca9553(card, 2, 0x80);
if (err)
return err;
/* prescaler for frequency 1: "FAST" = 5 Hz */
err = peak_pciec_write_pca9553(card, 3, 44 / 5);
if (err)
return err;
/* duty cycle 1: 50% */
err = peak_pciec_write_pca9553(card, 4, 0x80);
if (err)
return err;
/* switch LEDs to initial state */
return peak_pciec_write_pca9553(card, 5, PCA9553_LS0_INIT);
}
/*
* restore LEDs state to off peak_pciec_leds_exit
*/
static void peak_pciec_leds_exit(struct peak_pciec_card *card)
{
/* switch LEDs to off */
peak_pciec_write_pca9553(card, 5, PCA9553_LED_OFF_ALL);
}
/*
* normal write sja1000 register method overloaded to catch when controller
* is started or stopped, to control leds
*/
static void peak_pciec_write_reg(const struct sja1000_priv *priv,
int port, u8 val)
{
struct peak_pci_chan *chan = priv->priv;
struct peak_pciec_card *card = chan->pciec_card;
int c = (priv->reg_base - card->reg_base) / PEAK_PCI_CHAN_SIZE;
/* sja1000 register changes control the leds state */
if (port == REG_MOD)
switch (val) {
case MOD_RM:
/* Reset Mode: set led on */
peak_pciec_set_leds(card, PCA9553_LED(c), PCA9553_ON);
break;
case 0x00:
/* Normal Mode: led slow blinking and start led timer */
peak_pciec_set_leds(card, PCA9553_LED(c), PCA9553_SLOW);
peak_pciec_start_led_work(card);
break;
default:
break;
}
/* call base function */
peak_pci_write_reg(priv, port, val);
}
static struct i2c_algo_bit_data peak_pciec_i2c_bit_ops = {
.setsda = pita_setsda,
.setscl = pita_setscl,
.getsda = pita_getsda,
.getscl = pita_getscl,
.udelay = 10,
.timeout = HZ,
};
static int peak_pciec_probe(struct pci_dev *pdev, struct net_device *dev)
{
struct sja1000_priv *priv = netdev_priv(dev);
struct peak_pci_chan *chan = priv->priv;
struct peak_pciec_card *card;
int err;
/* copy i2c object address from 1st channel */
if (chan->prev_dev) {
struct sja1000_priv *prev_priv = netdev_priv(chan->prev_dev);
struct peak_pci_chan *prev_chan = prev_priv->priv;
card = prev_chan->pciec_card;
if (!card)
return -ENODEV;
/* channel is the first one: do the init part */
} else {
/* create the bit banging I2C adapter structure */
card = kzalloc(sizeof(struct peak_pciec_card), GFP_KERNEL);
if (!card)
return -ENOMEM;
card->cfg_base = chan->cfg_base;
card->reg_base = priv->reg_base;
card->led_chip.owner = THIS_MODULE;
card->led_chip.dev.parent = &pdev->dev;
card->led_chip.algo_data = &card->i2c_bit;
strncpy(card->led_chip.name, "peak_i2c",
sizeof(card->led_chip.name));
card->i2c_bit = peak_pciec_i2c_bit_ops;
card->i2c_bit.udelay = 10;
card->i2c_bit.timeout = HZ;
card->i2c_bit.data = card;
peak_pciec_init_pita_gpio(card);
err = i2c_bit_add_bus(&card->led_chip);
if (err) {
dev_err(&pdev->dev, "i2c init failed\n");
goto pciec_init_err_1;
}
err = peak_pciec_init_leds(card);
if (err) {
dev_err(&pdev->dev, "leds hardware init failed\n");
goto pciec_init_err_2;
}
INIT_DELAYED_WORK(&card->led_work, peak_pciec_led_work);
/* PCAN-ExpressCard needs its own callback for leds */
priv->write_reg = peak_pciec_write_reg;
}
chan->pciec_card = card;
card->channel[card->chan_count++].netdev = dev;
return 0;
pciec_init_err_2:
i2c_del_adapter(&card->led_chip);
pciec_init_err_1:
peak_pciec_init_pita_gpio(card);
kfree(card);
return err;
}
static void peak_pciec_remove(struct peak_pciec_card *card)
{
peak_pciec_stop_led_work(card);
peak_pciec_leds_exit(card);
i2c_del_adapter(&card->led_chip);
peak_pciec_init_pita_gpio(card);
kfree(card);
}
#else /* CONFIG_CAN_PEAK_PCIEC */
/*
* Placebo functions when PCAN-ExpressCard support is not selected
*/
static inline int peak_pciec_probe(struct pci_dev *pdev, struct net_device *dev)
{
return -ENODEV;
}
static inline void peak_pciec_remove(struct peak_pciec_card *card)
{
}
#endif /* CONFIG_CAN_PEAK_PCIEC */
static u8 peak_pci_read_reg(const struct sja1000_priv *priv, int port)
{
return readb(priv->reg_base + (port << 2));
}
static void peak_pci_write_reg(const struct sja1000_priv *priv,
int port, u8 val)
{
writeb(val, priv->reg_base + (port << 2));
}
static void peak_pci_post_irq(const struct sja1000_priv *priv)
{
struct peak_pci_chan *chan = priv->priv;
u16 icr;
/* Select and clear in PITA stored interrupt */
icr = readw(chan->cfg_base + PITA_ICR);
if (icr & chan->icr_mask)
writew(chan->icr_mask, chan->cfg_base + PITA_ICR);
}
static int peak_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
struct sja1000_priv *priv;
struct peak_pci_chan *chan;
struct net_device *dev;
void __iomem *cfg_base, *reg_base;
u16 sub_sys_id, icr;
int i, err, channels;
err = pci_enable_device(pdev);
if (err)
return err;
err = pci_request_regions(pdev, DRV_NAME);
if (err)
goto failure_disable_pci;
err = pci_read_config_word(pdev, 0x2e, &sub_sys_id);
if (err)
goto failure_release_regions;
dev_dbg(&pdev->dev, "probing device %04x:%04x:%04x\n",
pdev->vendor, pdev->device, sub_sys_id);
err = pci_write_config_word(pdev, 0x44, 0);
if (err)
goto failure_release_regions;
if (sub_sys_id >= 12)
channels = 4;
else if (sub_sys_id >= 10)
channels = 3;
else if (sub_sys_id >= 4)
channels = 2;
else
channels = 1;
cfg_base = pci_iomap(pdev, 0, PEAK_PCI_CFG_SIZE);
if (!cfg_base) {
dev_err(&pdev->dev, "failed to map PCI resource #0\n");
err = -ENOMEM;
goto failure_release_regions;
}
reg_base = pci_iomap(pdev, 1, PEAK_PCI_CHAN_SIZE * channels);
if (!reg_base) {
dev_err(&pdev->dev, "failed to map PCI resource #1\n");
err = -ENOMEM;
goto failure_unmap_cfg_base;
}
/* Set GPIO control register */
writew(0x0005, cfg_base + PITA_GPIOICR + 2);
/* Enable all channels of this card */
writeb(0x00, cfg_base + PITA_GPIOICR);
/* Toggle reset */
writeb(0x05, cfg_base + PITA_MISC + 3);
mdelay(5);
/* Leave parport mux mode */
writeb(0x04, cfg_base + PITA_MISC + 3);
icr = readw(cfg_base + PITA_ICR + 2);
for (i = 0; i < channels; i++) {
dev = alloc_sja1000dev(sizeof(struct peak_pci_chan));
if (!dev) {
err = -ENOMEM;
goto failure_remove_channels;
}
priv = netdev_priv(dev);
chan = priv->priv;
chan->cfg_base = cfg_base;
priv->reg_base = reg_base + i * PEAK_PCI_CHAN_SIZE;
priv->read_reg = peak_pci_read_reg;
priv->write_reg = peak_pci_write_reg;
priv->post_irq = peak_pci_post_irq;
priv->can.clock.freq = PEAK_PCI_CAN_CLOCK;
priv->ocr = PEAK_PCI_OCR;
priv->cdr = PEAK_PCI_CDR;
/* Neither a slave nor a single device distributes the clock */
if (channels == 1 || i > 0)
priv->cdr |= CDR_CLK_OFF;
/* Setup interrupt handling */
priv->irq_flags = IRQF_SHARED;
dev->irq = pdev->irq;
chan->icr_mask = peak_pci_icr_masks[i];
icr |= chan->icr_mask;
SET_NETDEV_DEV(dev, &pdev->dev);
/* Create chain of SJA1000 devices */
chan->prev_dev = pci_get_drvdata(pdev);
pci_set_drvdata(pdev, dev);
/*
* PCAN-ExpressCard needs some additional i2c init.
* This must be done *before* register_sja1000dev() but
* *after* devices linkage
*/
if (pdev->device == PEAK_PCIEC_DEVICE_ID) {
err = peak_pciec_probe(pdev, dev);
if (err) {
dev_err(&pdev->dev,
"failed to probe device (err %d)\n",
err);
goto failure_free_dev;
}
}
err = register_sja1000dev(dev);
if (err) {
dev_err(&pdev->dev, "failed to register device\n");
goto failure_free_dev;
}
dev_info(&pdev->dev,
"%s at reg_base=0x%p cfg_base=0x%p irq=%d\n",
dev->name, priv->reg_base, chan->cfg_base, dev->irq);
}
/* Enable interrupts */
writew(icr, cfg_base + PITA_ICR + 2);
return 0;
failure_free_dev:
pci_set_drvdata(pdev, chan->prev_dev);
free_sja1000dev(dev);
failure_remove_channels:
/* Disable interrupts */
writew(0x0, cfg_base + PITA_ICR + 2);
chan = NULL;
for (dev = pci_get_drvdata(pdev); dev; dev = chan->prev_dev) {
unregister_sja1000dev(dev);
free_sja1000dev(dev);
priv = netdev_priv(dev);
chan = priv->priv;
}
/* free any PCIeC resources too */
if (chan && chan->pciec_card)
peak_pciec_remove(chan->pciec_card);
pci_iounmap(pdev, reg_base);
failure_unmap_cfg_base:
pci_iounmap(pdev, cfg_base);
failure_release_regions:
pci_release_regions(pdev);
failure_disable_pci:
pci_disable_device(pdev);
return err;
}
static void peak_pci_remove(struct pci_dev *pdev)
{
struct net_device *dev = pci_get_drvdata(pdev); /* Last device */
struct sja1000_priv *priv = netdev_priv(dev);
struct peak_pci_chan *chan = priv->priv;
void __iomem *cfg_base = chan->cfg_base;
void __iomem *reg_base = priv->reg_base;
/* Disable interrupts */
writew(0x0, cfg_base + PITA_ICR + 2);
/* Loop over all registered devices */
while (1) {
dev_info(&pdev->dev, "removing device %s\n", dev->name);
unregister_sja1000dev(dev);
free_sja1000dev(dev);
dev = chan->prev_dev;
if (!dev) {
/* do that only for first channel */
if (chan->pciec_card)
peak_pciec_remove(chan->pciec_card);
break;
}
priv = netdev_priv(dev);
chan = priv->priv;
}
pci_iounmap(pdev, reg_base);
pci_iounmap(pdev, cfg_base);
pci_release_regions(pdev);
pci_disable_device(pdev);
pci_set_drvdata(pdev, NULL);
}
static struct pci_driver peak_pci_driver = {
.name = DRV_NAME,
.id_table = peak_pci_tbl,
.probe = peak_pci_probe,
.remove = peak_pci_remove,
};
module_pci_driver(peak_pci_driver);
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