[PATCH 0/2] can/sja1000: Add/upgrade PEAK-System sja1000 driver

[PATCH 0/2] can/sja1000: Add/upgrade PEAK-System sja1000 driver

[Stephane Grosjean]

That serie of patches upgrades the peak_pci driver and adds the peak_pcmcia
new driver, to handle all the sja1000 PCI based from PEAK-System Technik
(http://www.peak-system.com).
These patches are planned for kernel v3.02.00 and above.

Stephane Grosjean (1):
  can/sja1000: Add PEAK-System PCIe/PCIeC and miniPCI boards

Stephane Grosjean (1):
  can/sja1000: Add support of PEAK-System PCMCIA board

 drivers/net/can/sja1000/Kconfig       |    9 +
 drivers/net/can/sja1000/Makefile      |    1 +
 drivers/net/can/sja1000/peak_pci.c    |  521 ++++++++++++++++++++++--
 drivers/net/can/sja1000/peak_pcmcia.c |  721 +++++++++++++++++++++++++++++++++
 4 files changed, 1212 insertions(+), 40 deletions(-)
 create mode 100644 drivers/net/can/sja1000/peak_pcmcia.c

-- 
1.7.5.4

[PATCH 1/2] can/sja1000: Add PEAK-System PCIe/PCIeC and miniPCI boards

[Stephane Grosjean]

This patch adds the support of some new PEAK-System Technik sja1000 boards
(http://www.peak-system.com):

PCAN-PCI Express (1 or 2 channels)
PCAN-ExpressCard (1 or 2 channels)
PCAN-miniPCI (1 or 2 channels)

All of these boards are compliant with CAN specifications 2.0A (11-bit ID) and
2.0B (29-bit ID).

This patch also fixes the management of the channels list.

Signed-off-by: Stephane Grosjean <s.grosjean@peak-system.com>
---
 drivers/net/can/sja1000/peak_pci.c |  521 +++++++++++++++++++++++++++++++++---
 1 files changed, 481 insertions(+), 40 deletions(-)

diff --git a/drivers/net/can/sja1000/peak_pci.c b/drivers/net/can/sja1000/peak_pci.c
index 2c7f503..02d94bd 100644
--- a/drivers/net/can/sja1000/peak_pci.c
+++ b/drivers/net/can/sja1000/peak_pci.c
@@ -1,9 +1,9 @@
 /*
  * Copyright (C) 2007, 2011 Wolfgang Grandegger <wg@grandegger.com>
  *
- * Derived from the PCAN project file driver/src/pcan_pci.c:
+ * Derived from the PCAN project files driver/src/pcan_pci.c:
  *
- * Copyright (C) 2001-2006  PEAK System-Technik GmbH
+ * Copyright (C) 2001-2012  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
@@ -13,12 +13,7 @@
  * 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/kernel.h>
 #include <linux/module.h>
 #include <linux/interrupt.h>
@@ -26,46 +21,117 @@
 #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("Wolfgang Grandegger <wg@grandegger.com>");
-MODULE_DESCRIPTION("Socket-CAN driver for PEAK PCAN PCI/PCIe cards");
-MODULE_SUPPORTED_DEVICE("PEAK PCAN PCI/PCIe CAN card");
+MODULE_DESCRIPTION("Socket-CAN driver for PEAK PCAN PCI family cards");
+MODULE_SUPPORTED_DEVICE("PEAK PCAN PCI/PCIe/PCIeC miniPCI CAN cards");
 MODULE_LICENSE("GPL v2");
 
-#define DRV_NAME  "peak_pci"
-
-struct peak_pci_chan {
-	void __iomem *cfg_base;	     /* Common for all channels */
-	struct net_device *next_dev; /* Chain of network devices */
-	u16 icr_mask;		     /* Interrupt mask for fast ack */
-};
+#define PEAK_PCI_DRV_NAME	"peak_pci"
+#define PEAK_PCI_CHAN_MAX	4
 
 #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
- */
+/* PITA registers */
 #define PITA_ICR		0x00	/* Interrupt control register */
 #define PITA_GPIOICR		0x18	/* GPIO interface control register */
 #define PITA_MISC		0x1C	/* Miscellaneous register */
 
+/* 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 */
+
+/* LEDs control */
+#define PCA9553_1_SLAVEADDR	(0xC4 >> 1)
+
+/* PCA9553 LS0 fields values */
+enum {
+	PCA9553_LOW,
+	PCA9553_HIGHZ,
+	PCA9553_PWM0,
+	PCA9553_PWM1
+};
+
+#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) */
+
+#define PCA9553_LS0_NONE	0x45 /* off value */
+
 #define PEAK_PCI_CFG_SIZE	0x1000	/* Size of the config PCI bar */
 #define PEAK_PCI_CHAN_SIZE	0x0400	/* Size used by the channel */
 
+/* PCI stuff */
 #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_MPCI_DEVICE_ID	0x0008	/* The miniPCI slot cards */
+
+/* PCAN-PCIeC specific (leds management) */
+struct peak_pciec_chan {
+	struct net_device *netdev;
+	unsigned long prev_rx_bytes;
+	unsigned long prev_tx_bytes;
+};
 
-static const u16 peak_pci_icr_masks[] = {0x02, 0x01, 0x40, 0x80};
+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 timer_list led_timer;	/* activity timer */
+	int chan_count;
+	struct peak_pciec_chan channel[PEAK_PCI_CHAN_MAX];
+};
+
+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 */
+};
+
+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_PCIEC_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,},
 	{0,}
 };
 
@@ -85,20 +151,370 @@ static void peak_pci_write_reg(const struct sja1000_priv *priv,
 static void peak_pci_post_irq(const struct sja1000_priv *priv)
 {
 	struct peak_pci_chan *chan = priv->priv;
-	u16 icr;
+	u16 icr = readw(chan->cfg_base + PITA_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 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;
+}
+
+/*
+ * timer callback used to control the LEDs
+ */
+static void peak_pciec_led_timer(unsigned long arg)
+{
+	struct peak_pciec_card *card = (struct peak_pciec_card *)arg;
+	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)
+		mod_timer(&card->led_timer, jiffies + 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 timer to control LEDs
+ */
+static void peak_pciec_start_led_timer(struct peak_pciec_card *card)
+{
+	if (!timer_pending(&card->led_timer))
+		mod_timer(&card->led_timer, jiffies + HZ);
+}
+
+/*
+ * stop LEDs timer
+ */
+static void peak_pciec_stop_led_timer(struct peak_pciec_card *card)
+{
+	del_timer_sync(&card->led_timer);
+}
+
+/*
+ * 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_timer(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_init(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) {
+			dev_warn(&pdev->dev,
+				 "failed allocating memory for leds chip\n");
+			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_warn(&pdev->dev, "i2c init failed\n");
+			peak_pciec_init_pita_gpio(card);
+			kfree(card);
+			return err;
+		}
+
+		err = peak_pciec_init_leds(card);
+		if (err) {
+			dev_warn(&pdev->dev, "leds hardware init failed\n");
+			i2c_del_adapter(&card->led_chip);
+			peak_pciec_init_pita_gpio(card);
+			kfree(card);
+			return err;
+		}
+
+		/* init the timer which controls the leds */
+		init_timer(&card->led_timer);
+		card->led_timer.function = peak_pciec_led_timer;
+		card->led_timer.data = (unsigned long)card;
+	}
+
+	chan->pciec_card = card;
+	card->channel[card->chan_count++].netdev = dev;
+
+	return 0;
+}
+
+static void peak_pciec_remove(struct peak_pciec_card *card)
+{
+	peak_pciec_stop_led_timer(card);
+	peak_pciec_leds_exit(card);
+	i2c_del_adapter(&card->led_chip);
+	peak_pciec_init_pita_gpio(card);
+	kfree(card);
+}
+
 static int __devinit 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, *dev0 = NULL;
+	struct net_device *dev;
 	void __iomem *cfg_base, *reg_base;
 	u16 sub_sys_id, icr;
 	int i, err, channels;
@@ -107,7 +523,7 @@ static int __devinit peak_pci_probe(struct pci_dev *pdev,
 	if (err)
 		return err;
 
-	err = pci_request_regions(pdev, DRV_NAME);
+	err = pci_request_regions(pdev, PEAK_PCI_DRV_NAME);
 	if (err)
 		goto failure_disable_pci;
 
@@ -168,8 +584,10 @@ static int __devinit peak_pci_probe(struct pci_dev *pdev,
 		chan->cfg_base = cfg_base;
 		priv->reg_base = reg_base + i * PEAK_PCI_CHAN_SIZE;
 
+		/* PCAN-ExpressCard needs some support for leds */
+		priv->write_reg = (pdev->device == PEAK_PCIEC_DEVICE_ID) ?
+				   peak_pciec_write_reg : peak_pci_write_reg;
 		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;
@@ -188,26 +606,40 @@ static int __devinit peak_pci_probe(struct pci_dev *pdev,
 
 		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 support for leds. This must be
+		 * done *before* register_sja1000dev() but *after* devices
+		 * linkage
+		 */
+		if (pdev->device == PEAK_PCIEC_DEVICE_ID) {
+			err = peak_pciec_init(pdev, dev);
+			if (err) {
+				dev_warn(&pdev->dev,
+					"%s channel led won't blink (err %d)\n",
+					dev->name, err);
+
+				/* handle board as a PCI card */
+				priv->write_reg = peak_pci_write_reg;
+			}
+		}
+
 		err = register_sja1000dev(dev);
 		if (err) {
 			dev_err(&pdev->dev, "failed to register device\n");
+			pci_set_drvdata(pdev, chan->prev_dev);
 			free_sja1000dev(dev);
 			goto failure_remove_channels;
 		}
 
-		/* Create chain of SJA1000 devices */
-		if (i == 0)
-			dev0 = dev;
-		else
-			chan->next_dev = 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);
 	}
 
-	pci_set_drvdata(pdev, dev0);
-
 	/* Enable interrupts */
 	writew(icr, cfg_base + PITA_ICR + 2);
 
@@ -217,14 +649,18 @@ failure_remove_channels:
 	/* Disable interrupts */
 	writew(0x0, cfg_base + PITA_ICR + 2);
 
-	for (dev = dev0; dev; dev = chan->next_dev) {
+	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;
-		dev = chan->next_dev;
 	}
 
+	/* 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:
@@ -241,7 +677,7 @@ failure_disable_pci:
 
 static void __devexit peak_pci_remove(struct pci_dev *pdev)
 {
-	struct net_device *dev = pci_get_drvdata(pdev); /* First device */
+	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;
@@ -255,9 +691,14 @@ static void __devexit peak_pci_remove(struct pci_dev *pdev)
 		dev_info(&pdev->dev, "removing device %s\n", dev->name);
 		unregister_sja1000dev(dev);
 		free_sja1000dev(dev);
-		dev = chan->next_dev;
-		if (!dev)
+		dev = chan->prev_dev;
+
+		/* do that only for first channel */
+		if (!dev) {
+			if (chan->pciec_card)
+				peak_pciec_remove(chan->pciec_card);
 			break;
+		}
 		priv = netdev_priv(dev);
 		chan = priv->priv;
 	}
@@ -271,7 +712,7 @@ static void __devexit peak_pci_remove(struct pci_dev *pdev)
 }
 
 static struct pci_driver peak_pci_driver = {
-	.name = DRV_NAME,
+	.name = PEAK_PCI_DRV_NAME,
 	.id_table = peak_pci_tbl,
 	.probe = peak_pci_probe,
 	.remove = __devexit_p(peak_pci_remove),
-- 
1.7.5.4

Re: [PATCH 1/2] can/sja1000: Add PEAK-System PCIe/PCIeC and miniPCI boards

[Marc Kleine-Budde]

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On 01/31/2012 02:19 PM, Stephane Grosjean wrote:
> This patch adds the support of some new PEAK-System Technik sja1000 boards
> (http://www.peak-system.com):
> 
> PCAN-PCI Express (1 or 2 channels)
> PCAN-ExpressCard (1 or 2 channels)
> PCAN-miniPCI (1 or 2 channels)
> 
> All of these boards are compliant with CAN specifications 2.0A (11-bit ID) and
> 2.0B (29-bit ID).
> 
> This patch also fixes the management of the channels list.

Without looking further at the patch, please make it a seperate patch. A
detailed review will follow.


Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


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Re: [PATCH 1/2] can/sja1000: Add PEAK-System PCIe/PCIeC and miniPCI boards

[Stephane Grosjean]

Hi Marc,

What do you mean please? You want me to post 4 patches? One for each new 
board, plus one for the channels list management? For 2 of the 3 boards, 
this is as simple as adding a line into the device ids table, excepting 
the ExpressCard for which I added the management of the funky leds.
Thanks for any clarification.

Stéphane


Le 31/01/2012 14:25, Marc Kleine-Budde a écrit :
> On 01/31/2012 02:19 PM, Stephane Grosjean wrote:
>> This patch adds the support of some new PEAK-System Technik sja1000 boards
>> (http://www.peak-system.com):
>>
>> PCAN-PCI Express (1 or 2 channels)
>> PCAN-ExpressCard (1 or 2 channels)
>> PCAN-miniPCI (1 or 2 channels)
>>
>> All of these boards are compliant with CAN specifications 2.0A (11-bit ID) and
>> 2.0B (29-bit ID).
>>
>> This patch also fixes the management of the channels list.
> Without looking further at the patch, please make it a seperate patch. A
> detailed review will follow.
>
>
> Marc
>
--
PEAK-System Technik GmbH, Otto-Roehm-Strasse 69, D-64293 Darmstadt 
Geschaeftsleitung: A.Gach/U.Wilhelm,St.Nr.:007/241/13586 FA Darmstadt 
HRB-9183 Darmstadt, Ust.IdNr.:DE 202220078, WEE-Reg.-Nr.: DE39305391 
Tel.+49 (0)6151-817320 / Fax:+49 (0)6151-817329, info@peak-system.com

Re: [PATCH 1/2] can/sja1000: Add PEAK-System PCIe/PCIeC and miniPCI boards

[Wolfgang Grandegger]

On 01/31/2012 04:01 PM, Stephane Grosjean wrote:
> Hi Marc,
> 
> What do you mean please? You want me to post 4 patches? One for each new
> board, plus one for the channels list management? For 2 of the 3 boards,
> this is as simple as adding a line into the device ids table, excepting
> the ExpressCard for which I added the management of the funky leds.
> Thanks for any clarification.

I think he wants two separate patches, instead a series of patches. One
patch for peak_pci and another for peak_pcmcia. Which does make sense as
they do not belong together.

Wolfgang.

Re: [PATCH 1/2] can/sja1000: Add PEAK-System PCIe/PCIeC and miniPCI boards

[Stephane Grosjean]

I thought my serie of patches concerned the can/sja1000 subdir...
But ok I see, I'll do these two distinct patches then will post that 
stuff again soon.

Stéphane.

Le 31/01/2012 16:16, Wolfgang Grandegger a écrit :
> On 01/31/2012 04:01 PM, Stephane Grosjean wrote:
>> Hi Marc,
>>
>> What do you mean please? You want me to post 4 patches? One for each new
>> board, plus one for the channels list management? For 2 of the 3 boards,
>> this is as simple as adding a line into the device ids table, excepting
>> the ExpressCard for which I added the management of the funky leds.
>> Thanks for any clarification.
> I think he wants two separate patches, instead a series of patches. One
> patch for peak_pci and another for peak_pcmcia. Which does make sense as
> they do not belong together.
>
> Wolfgang.
--
PEAK-System Technik GmbH, Otto-Roehm-Strasse 69, D-64293 Darmstadt 
Geschaeftsleitung: A.Gach/U.Wilhelm,St.Nr.:007/241/13586 FA Darmstadt 
HRB-9183 Darmstadt, Ust.IdNr.:DE 202220078, WEE-Reg.-Nr.: DE39305391 
Tel.+49 (0)6151-817320 / Fax:+49 (0)6151-817329, info@peak-system.com

Re: [PATCH 1/2] can/sja1000: Add PEAK-System PCIe/PCIeC and miniPCI boards

[Stephane Grosjean]

Hi,

I've got one question about some new patch(es) I'd like to post in the 
drivers/net/can/sja1000 subdir too, about a pcmcia driver.
According to which commit should I create this new patch?
I mean, I recently posted a patch to change the above Kconfig 
description. Will the new patch's Kconfig include these modifications or 
should I wait for some ack or else?..

Regards,

Stéphane

Le 31/01/2012 16:16, Wolfgang Grandegger a écrit :
> On 01/31/2012 04:01 PM, Stephane Grosjean wrote:
>> Hi Marc,
>>
>> What do you mean please? You want me to post 4 patches? One for each new
>> board, plus one for the channels list management? For 2 of the 3 boards,
>> this is as simple as adding a line into the device ids table, excepting
>> the ExpressCard for which I added the management of the funky leds.
>> Thanks for any clarification.
> I think he wants two separate patches, instead a series of patches. One
> patch for peak_pci and another for peak_pcmcia. Which does make sense as
> they do not belong together.
>
> Wolfgang.
--
PEAK-System Technik GmbH, Otto-Roehm-Strasse 69, D-64293 Darmstadt 
Geschaeftsleitung: A.Gach/U.Wilhelm,St.Nr.:007/241/13586 FA Darmstadt 
HRB-9183 Darmstadt, Ust.IdNr.:DE 202220078, WEE-Reg.-Nr.: DE39305391 
Tel.+49 (0)6151-817320 / Fax:+49 (0)6151-817329, info@peak-system.com

Re: [PATCH 1/2] can/sja1000: Add PEAK-System PCIe/PCIeC and miniPCI boards

[Marc Kleine-Budde]

[-- Attachment #1: Type: text/plain, Size: 975 bytes --]

On 01/31/2012 04:01 PM, Stephane Grosjean wrote:
> Hi Marc,
> 
> What do you mean please? You want me to post 4 patches? One for each new
> board, plus one for the channels list management? For 2 of the 3 boards,
> this is as simple as adding a line into the device ids table, excepting
> the ExpressCard for which I added the management of the funky leds.
> Thanks for any clarification.

[...]

Your patch states to fix a problem:

>>> This patch also fixes the management of the channels list.
>> Without looking further at the patch, please make it a seperate patch. A
>> detailed review will follow.

It would be better to fix the problem before adding new features.

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


[-- Attachment #2: OpenPGP digital signature --]
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Re: [PATCH 1/2] can/sja1000: Add PEAK-System PCIe/PCIeC and miniPCI boards

[Marc Kleine-Budde]

[-- Attachment #1: Type: text/plain, Size: 22146 bytes --]

On 01/31/2012 02:19 PM, Stephane Grosjean wrote:
> This patch adds the support of some new PEAK-System Technik sja1000 boards
> (http://www.peak-system.com):
> 
> PCAN-PCI Express (1 or 2 channels)
> PCAN-ExpressCard (1 or 2 channels)
> PCAN-miniPCI (1 or 2 channels)
> 
> All of these boards are compliant with CAN specifications 2.0A (11-bit ID) and
> 2.0B (29-bit ID).
> 
> This patch also fixes the management of the channels list.
> 
> Signed-off-by: Stephane Grosjean <s.grosjean@peak-system.com>
> ---
>  drivers/net/can/sja1000/peak_pci.c |  521 +++++++++++++++++++++++++++++++++---
>  1 files changed, 481 insertions(+), 40 deletions(-)
> 
> diff --git a/drivers/net/can/sja1000/peak_pci.c b/drivers/net/can/sja1000/peak_pci.c
> index 2c7f503..02d94bd 100644
> --- a/drivers/net/can/sja1000/peak_pci.c
> +++ b/drivers/net/can/sja1000/peak_pci.c
> @@ -1,9 +1,9 @@
>  /*
>   * Copyright (C) 2007, 2011 Wolfgang Grandegger <wg@grandegger.com>
>   *
> - * Derived from the PCAN project file driver/src/pcan_pci.c:
> + * Derived from the PCAN project files driver/src/pcan_pci.c:
>   *
> - * Copyright (C) 2001-2006  PEAK System-Technik GmbH
> + * Copyright (C) 2001-2012  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
> @@ -13,12 +13,7 @@
>   * 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/kernel.h>
>  #include <linux/module.h>
>  #include <linux/interrupt.h>
> @@ -26,46 +21,117 @@
>  #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("Wolfgang Grandegger <wg@grandegger.com>");
> -MODULE_DESCRIPTION("Socket-CAN driver for PEAK PCAN PCI/PCIe cards");
> -MODULE_SUPPORTED_DEVICE("PEAK PCAN PCI/PCIe CAN card");
> +MODULE_DESCRIPTION("Socket-CAN driver for PEAK PCAN PCI family cards");
> +MODULE_SUPPORTED_DEVICE("PEAK PCAN PCI/PCIe/PCIeC miniPCI CAN cards");
>  MODULE_LICENSE("GPL v2");
>  
> -#define DRV_NAME  "peak_pci"
> -
> -struct peak_pci_chan {
> -	void __iomem *cfg_base;	     /* Common for all channels */
> -	struct net_device *next_dev; /* Chain of network devices */
> -	u16 icr_mask;		     /* Interrupt mask for fast ack */
> -};
> +#define PEAK_PCI_DRV_NAME	"peak_pci"
> +#define PEAK_PCI_CHAN_MAX	4
>  
>  #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
> - */
> +/* PITA registers */
>  #define PITA_ICR		0x00	/* Interrupt control register */
>  #define PITA_GPIOICR		0x18	/* GPIO interface control register */
>  #define PITA_MISC		0x1C	/* Miscellaneous register */
>  
> +/* 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 */
> +
> +/* LEDs control */
> +#define PCA9553_1_SLAVEADDR	(0xC4 >> 1)
> +
> +/* PCA9553 LS0 fields values */
> +enum {
> +	PCA9553_LOW,
> +	PCA9553_HIGHZ,
> +	PCA9553_PWM0,
> +	PCA9553_PWM1
> +};
> +
> +#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) */
> +
> +#define PCA9553_LS0_NONE	0x45 /* off value */
> +
>  #define PEAK_PCI_CFG_SIZE	0x1000	/* Size of the config PCI bar */
>  #define PEAK_PCI_CHAN_SIZE	0x0400	/* Size used by the channel */
>  
> +/* PCI stuff */
>  #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_MPCI_DEVICE_ID	0x0008	/* The miniPCI slot cards */
> +
> +/* PCAN-PCIeC specific (leds management) */
> +struct peak_pciec_chan {
> +	struct net_device *netdev;
> +	unsigned long prev_rx_bytes;
> +	unsigned long prev_tx_bytes;
> +};
>  
> -static const u16 peak_pci_icr_masks[] = {0x02, 0x01, 0x40, 0x80};
> +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 timer_list led_timer;	/* activity timer */
> +	int chan_count;
> +	struct peak_pciec_chan channel[PEAK_PCI_CHAN_MAX];
> +};
> +
> +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 */

Use tabs instead of spaces to align the comments.

> +	struct peak_pciec_card *pciec_card;	/* only for PCIeC */
> +};
> +
> +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_PCIEC_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,},
>  	{0,}
>  };
>  
> @@ -85,20 +151,370 @@ static void peak_pci_write_reg(const struct sja1000_priv *priv,
>  static void peak_pci_post_irq(const struct sja1000_priv *priv)
>  {
>  	struct peak_pci_chan *chan = priv->priv;
> -	u16 icr;
> +	u16 icr = readw(chan->cfg_base + PITA_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 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;
> +}
> +
> +/*
> + * timer callback used to control the LEDs
> + */
> +static void peak_pciec_led_timer(unsigned long arg)
> +{
> +	struct peak_pciec_card *card = (struct peak_pciec_card *)arg;
> +	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)
> +		mod_timer(&card->led_timer, jiffies + 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 timer to control LEDs
> + */
> +static void peak_pciec_start_led_timer(struct peak_pciec_card *card)
> +{
> +	if (!timer_pending(&card->led_timer))
> +		mod_timer(&card->led_timer, jiffies + HZ);
> +}
> +
> +/*
> + * stop LEDs timer
> + */
> +static void peak_pciec_stop_led_timer(struct peak_pciec_card *card)
> +{
> +	del_timer_sync(&card->led_timer);
> +}
> +
> +/*
> + * 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_timer(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_init(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) {
> +			dev_warn(&pdev->dev,
> +				 "failed allocating memory for leds chip\n");
> +			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_warn(&pdev->dev, "i2c init failed\n");
> +			peak_pciec_init_pita_gpio(card);
> +			kfree(card);
> +			return err;
> +		}
> +
> +		err = peak_pciec_init_leds(card);
> +		if (err) {
> +			dev_warn(&pdev->dev, "leds hardware init failed\n");
> +			i2c_del_adapter(&card->led_chip);
> +			peak_pciec_init_pita_gpio(card);
> +			kfree(card);
> +			return err;

Can you switch this code to goto style error handling, please?

> +		}
> +
> +		/* init the timer which controls the leds */
> +		init_timer(&card->led_timer);
> +		card->led_timer.function = peak_pciec_led_timer;
> +		card->led_timer.data = (unsigned long)card;
> +	}
> +
> +	chan->pciec_card = card;
> +	card->channel[card->chan_count++].netdev = dev;
> +
> +	return 0;
> +}
> +
> +static void peak_pciec_remove(struct peak_pciec_card *card)
> +{
> +	peak_pciec_stop_led_timer(card);
> +	peak_pciec_leds_exit(card);
> +	i2c_del_adapter(&card->led_chip);
> +	peak_pciec_init_pita_gpio(card);
> +	kfree(card);
> +}
> +
>  static int __devinit 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, *dev0 = NULL;
> +	struct net_device *dev;
>  	void __iomem *cfg_base, *reg_base;
>  	u16 sub_sys_id, icr;
>  	int i, err, channels;
> @@ -107,7 +523,7 @@ static int __devinit peak_pci_probe(struct pci_dev *pdev,
>  	if (err)
>  		return err;
>  
> -	err = pci_request_regions(pdev, DRV_NAME);
> +	err = pci_request_regions(pdev, PEAK_PCI_DRV_NAME);
>  	if (err)
>  		goto failure_disable_pci;
>  
> @@ -168,8 +584,10 @@ static int __devinit peak_pci_probe(struct pci_dev *pdev,
>  		chan->cfg_base = cfg_base;
>  		priv->reg_base = reg_base + i * PEAK_PCI_CHAN_SIZE;
>  
> +		/* PCAN-ExpressCard needs some support for leds */
> +		priv->write_reg = (pdev->device == PEAK_PCIEC_DEVICE_ID) ?
> +				   peak_pciec_write_reg : peak_pci_write_reg;
>  		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;
> @@ -188,26 +606,40 @@ static int __devinit peak_pci_probe(struct pci_dev *pdev,
>  
>  		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 support for leds. This must be
> +		 * done *before* register_sja1000dev() but *after* devices
> +		 * linkage
> +		 */
> +		if (pdev->device == PEAK_PCIEC_DEVICE_ID) {
> +			err = peak_pciec_init(pdev, dev);
> +			if (err) {
> +				dev_warn(&pdev->dev,
> +					"%s channel led won't blink (err %d)\n",
> +					dev->name, err);
> +
> +				/* handle board as a PCI card */

I read the code and understand why you can handle a PCIe card like a PCI
card. The PCIe card has additional support for the LEDs, this should be
refleced in the comment.

> +				priv->write_reg = peak_pci_write_reg;
> +			}
> +		}
> +
>  		err = register_sja1000dev(dev);
>  		if (err) {
>  			dev_err(&pdev->dev, "failed to register device\n");
> +			pci_set_drvdata(pdev, chan->prev_dev);
>  			free_sja1000dev(dev);
>  			goto failure_remove_channels;
>  		}
>  
> -		/* Create chain of SJA1000 devices */
> -		if (i == 0)
> -			dev0 = dev;
> -		else
> -			chan->next_dev = 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);
>  	}
>  
> -	pci_set_drvdata(pdev, dev0);
> -
>  	/* Enable interrupts */
>  	writew(icr, cfg_base + PITA_ICR + 2);
>  
> @@ -217,14 +649,18 @@ failure_remove_channels:
>  	/* Disable interrupts */
>  	writew(0x0, cfg_base + PITA_ICR + 2);
>  
> -	for (dev = dev0; dev; dev = chan->next_dev) {
> +	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;
> -		dev = chan->next_dev;
>  	}
>  
> +	/* 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:
> @@ -241,7 +677,7 @@ failure_disable_pci:
>  
>  static void __devexit peak_pci_remove(struct pci_dev *pdev)
>  {
> -	struct net_device *dev = pci_get_drvdata(pdev); /* First device */
> +	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;
> @@ -255,9 +691,14 @@ static void __devexit peak_pci_remove(struct pci_dev *pdev)
>  		dev_info(&pdev->dev, "removing device %s\n", dev->name);
>  		unregister_sja1000dev(dev);
>  		free_sja1000dev(dev);
> -		dev = chan->next_dev;
> -		if (!dev)
> +		dev = chan->prev_dev;
> +
> +		/* do that only for first channel */
> +		if (!dev) {
> +			if (chan->pciec_card)
> +				peak_pciec_remove(chan->pciec_card);
>  			break;
> +		}
>  		priv = netdev_priv(dev);
>  		chan = priv->priv;
>  	}
> @@ -271,7 +712,7 @@ static void __devexit peak_pci_remove(struct pci_dev *pdev)
>  }
>  
>  static struct pci_driver peak_pci_driver = {
> -	.name = DRV_NAME,
> +	.name = PEAK_PCI_DRV_NAME,
>  	.id_table = peak_pci_tbl,
>  	.probe = peak_pci_probe,
>  	.remove = __devexit_p(peak_pci_remove),

Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


[-- Attachment #2: OpenPGP digital signature --]
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[PATCH 2/2] can/sja1000: Add support of PEAK-System PCMCIA board

[Stephane Grosjean]

This patch adds the support of the PCAN-PC Card (PCMCIA) board from
PEAK-System Technik (http://www.peak-system.com). The PCAN-PC Card board is
sja1000 based and exists in 1 or 2 channels and is compliant with CAN
specifications 2.0A (11-bit ID) and 2.0B (29-bit ID).

Signed-off-by: Stephane Grosjean <s.grosjean@peak-system.com>
---
 drivers/net/can/sja1000/Kconfig       |    9 +
 drivers/net/can/sja1000/Makefile      |    1 +
 drivers/net/can/sja1000/peak_pcmcia.c |  721 +++++++++++++++++++++++++++++++++
 3 files changed, 731 insertions(+), 0 deletions(-)
 create mode 100644 drivers/net/can/sja1000/peak_pcmcia.c

diff --git a/drivers/net/can/sja1000/Kconfig b/drivers/net/can/sja1000/Kconfig
index 36e9d59..0c8309b 100644
--- a/drivers/net/can/sja1000/Kconfig
+++ b/drivers/net/can/sja1000/Kconfig
@@ -35,6 +35,15 @@ config CAN_EMS_PCMCIA
 	  This driver is for the one or two channel CPC-CARD cards from
 	  EMS Dr. Thomas Wuensche (http://www.ems-wuensche.de).
 
+config CAN_PEAK_PCMCIA
+	tristate "PEAK PCAN PC-Card"
+	depends on PCMCIA
+	---help---
+	  This driver is for the PCAN PC-Card PCMCIA adapter (1 or 2 channels)
+	  from PEAK Systems (http://www.peak-system.com). To compile this
+	  driver as a module, choose M here: the module will be called
+	  peak_pcmcia.
+
 config CAN_EMS_PCI
 	tristate "EMS CPC-PCI, CPC-PCIe and CPC-104P Card"
 	depends on PCI
diff --git a/drivers/net/can/sja1000/Makefile b/drivers/net/can/sja1000/Makefile
index 0604f24..b3d05cb 100644
--- a/drivers/net/can/sja1000/Makefile
+++ b/drivers/net/can/sja1000/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_CAN_SJA1000_OF_PLATFORM) += sja1000_of_platform.o
 obj-$(CONFIG_CAN_EMS_PCMCIA) += ems_pcmcia.o
 obj-$(CONFIG_CAN_EMS_PCI) += ems_pci.o
 obj-$(CONFIG_CAN_KVASER_PCI) += kvaser_pci.o
+obj-$(CONFIG_CAN_PEAK_PCMCIA) += peak_pcmcia.o
 obj-$(CONFIG_CAN_PEAK_PCI) += peak_pci.o
 obj-$(CONFIG_CAN_PLX_PCI) += plx_pci.o
 obj-$(CONFIG_CAN_TSCAN1) += tscan1.o
diff --git a/drivers/net/can/sja1000/peak_pcmcia.c b/drivers/net/can/sja1000/peak_pcmcia.c
new file mode 100644
index 0000000..6ba58c2
--- /dev/null
+++ b/drivers/net/can/sja1000/peak_pcmcia.c
@@ -0,0 +1,721 @@
+/*
+ * CAN driver for PEAK-System PCAN-PC Card
+ * Derived from the PCAN project file driver/src/pcan_pccard.c
+ *
+ * Copyright (C) 2006-2009 PEAK System-Technik GmbH
+ * Copyright (C) 2010-2012 Stephane Grosjean <s.grosjean@peak-system.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the version 2 of the GNU General Public License
+ * as published by the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/netdevice.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/io.h>
+#include <pcmcia/cistpl.h>
+#include <pcmcia/ds.h>
+#include <linux/can.h>
+#include <linux/can/dev.h>
+#include "sja1000.h"
+
+/* PEAK-System PCMCIA driver name */
+#define PCC_NAME "peak_pcmcia"
+
+MODULE_AUTHOR("Stephane Grosjean <s.grosjean@peak-system.com>");
+MODULE_DESCRIPTION("CAN driver for PEAK-System PCAN-PC Cards");
+MODULE_LICENSE("GPL v2");
+MODULE_SUPPORTED_DEVICE("PEAK PCAN-PC Card");
+
+#define PCC_CHAN_MAX		2
+
+#define PCC_CAN_CLOCK		(16000000 / 2)
+
+#define PCC_MANF_ID		0x0377
+#define PCC_CARD_ID		0x0001
+
+#define PCC_CHAN_SIZE		0x20
+#define PCC_CHAN_OFF(c)		((c) * PCC_CHAN_SIZE)
+#define PCC_COMN_OFF		(PCC_CHAN_OFF(PCC_CHAN_MAX))
+#define PCC_COMN_SIZE		0x40
+
+/* common area registers */
+#define PCC_CCR			0x00
+#define PCC_CSR			0x02
+#define PCC_CPR			0x04
+#define PCC_SPI_DIR		0x06
+#define PCC_SPI_DOR		0x08
+#define PCC_SPI_ADR		0x0a
+#define PCC_SPI_IR		0x0c
+#define PCC_FW_MAJOR		0x10
+#define PCC_FW_MINOR		0x12
+
+/* CCR bits */
+#define PCC_CCR_CLK_16		0x00
+#define PCC_CCR_CLK_10		0x01
+#define PCC_CCR_CLK_21		0x02
+#define PCC_CCR_CLK_8		0x03
+#define PCC_CCR_CLK_MASK	PCC_CCR_CLK_8
+
+#define PCC_CCR_RST_CHAN(c)	(0x01 << ((c) + 2))
+#define PCC_CCR_RST_ALL		(PCC_CCR_RST_CHAN(0) | PCC_CCR_RST_CHAN(1))
+#define PCC_CCR_RST_MASK	PCC_CCR_RST_ALL
+
+/* led selection bits */
+#define PCC_LED(c)		(1 << (c))
+#define PCC_LED_ALL		(PCC_LED(0) | PCC_LED(1))
+
+/* led state value */
+#define PCC_LED_ON		0x00
+#define PCC_LED_FAST		0x01
+#define PCC_LED_SLOW		0x02
+#define PCC_LED_OFF		0x03
+
+#define PCC_CCR_LED_CHAN(s, c)	((s) << (((c) + 2) << 1))
+
+#define PCC_CCR_LED_ON_CHAN(c)		PCC_CCR_LED_CHAN(PCC_LED_ON, c)
+#define PCC_CCR_LED_FAST_CHAN(c)	PCC_CCR_LED_CHAN(PCC_LED_FAST, c)
+#define PCC_CCR_LED_SLOW_CHAN(c)	PCC_CCR_LED_CHAN(PCC_LED_SLOW, c)
+#define PCC_CCR_LED_OFF_CHAN(c)		PCC_CCR_LED_CHAN(PCC_LED_OFF, c)
+#define PCC_CCR_LED_MASK_CHAN(c)	PCC_CCR_LED_OFF_CHAN(c)
+#define PCC_CCR_LED_OFF_ALL		(PCC_CCR_LED_OFF_CHAN(0) | \
+					 PCC_CCR_LED_OFF_CHAN(1))
+#define PCC_CCR_LED_MASK		PCC_CCR_LED_OFF_ALL
+
+#define PCC_CCR_INIT	(PCC_CCR_CLK_16 | PCC_CCR_RST_ALL | PCC_CCR_LED_OFF_ALL)
+
+/* CSR bits */
+#define PCC_CSR_SPI_BUSY		0x04
+
+#define PCC_SPI_MAX_BUSY_WAIT_MS	3	/* time waiting for spi !busy */
+
+/* max count of reading the SPI status register waiting for a change */
+#define PCC_WRITE_MAX_LOOP		1000
+
+/* max nb of int handled by that isr in one shot (prevent from infinite loop) */
+#define PCC_ISR_MAX_LOOP		10
+
+/* EEPROM chip instruction set */
+/* note: EEPROM Read/Write instructions include A8 bit */
+#define PCC_EEP_WRITE(a)	(0x02 | (((a) & 0x100) >> 5))
+#define PCC_EEP_READ(a)		(0x03 | (((a) & 0x100) >> 5))
+#define PCC_EEP_WRDI		0x04	/* EEPROM Write Disable */
+#define PCC_EEP_RDSR		0x05	/* EEPROM Read Status Register */
+#define PCC_EEP_WREN		0x06	/* EEPROM Write Enable */
+
+/* EEPROM Status Register bits */
+#define PCC_EEP_SR_WEN		0x02	/* EEPROM SR Write Enable bit */
+#define PCC_EEP_SR_WIP		0x01	/* EEPROM SR Write In Progress bit */
+
+/*
+ * The board configuration is probably following:
+ * RX1 is connected to ground.
+ * TX1 is not connected.
+ * CLKO is not connected.
+ * Setting the OCR register to 0xDA is a good idea.
+ * This means normal output mode, push-pull and the correct polarity.
+ */
+#define PCC_OCR			(OCR_TX0_PUSHPULL | OCR_TX1_PUSHPULL)
+
+/*
+ * In the CDR register, you should set CBP to 1.
+ * You will probably also want to set the clock divider value to 7
+ * (meaning direct oscillator output) because the second SJA1000 chip
+ * is driven by the first one CLKOUT output.
+ */
+#define PCC_CDR			(CDR_CBP | CDR_CLKOUT_MASK)
+
+struct pcan_channel {
+	struct net_device *netdev;
+	unsigned long prev_rx_bytes;
+	unsigned long prev_tx_bytes;
+};
+
+/* PCAN-PC Card private structure */
+struct pcan_pccard {
+	struct pcmcia_device *pdev;
+	int chan_count;
+	struct pcan_channel channel[PCC_CHAN_MAX];
+	u8 ccr;
+	void __iomem *ioport_addr;
+	struct timer_list led_timer;
+};
+
+static struct pcmcia_device_id pcan_table[] = {
+	PCMCIA_DEVICE_MANF_CARD(PCC_MANF_ID, PCC_CARD_ID),
+	PCMCIA_DEVICE_NULL,
+};
+
+MODULE_DEVICE_TABLE(pcmcia, pcan_table);
+
+static void pcan_set_leds(struct pcan_pccard *card, u8 mask, u8 state);
+
+/*
+ * start timer which controls leds state
+ */
+static void pcan_start_led_timer(struct pcan_pccard *card)
+{
+	if (!timer_pending(&card->led_timer))
+		mod_timer(&card->led_timer, jiffies + HZ);
+}
+
+/*
+ * stop the timer which controls leds state
+ */
+static void pcan_stop_led_timer(struct pcan_pccard *card)
+{
+	del_timer_sync(&card->led_timer);
+}
+
+/*
+ * read a sja1000 register
+ */
+static u8 pcan_read_canreg(const struct sja1000_priv *priv, int port)
+{
+	return ioread8(priv->reg_base + port);
+}
+
+/*
+ * write a sja1000 register
+ */
+static void pcan_write_canreg(const struct sja1000_priv *priv, int port, u8 v)
+{
+	struct pcan_pccard *card = priv->priv;
+	int c = (priv->reg_base - card->ioport_addr) / PCC_CHAN_SIZE;
+
+	/* sja1000 register changes control the leds state */
+	if (port == REG_MOD)
+		switch (v) {
+		case MOD_RM:
+			/* Reset Mode: set led on */
+			pcan_set_leds(card, PCC_LED(c), PCC_LED_ON);
+			break;
+		case 0x00:
+			/* Normal Mode: led slow blinking and start led timer */
+			pcan_set_leds(card, PCC_LED(c), PCC_LED_SLOW);
+			pcan_start_led_timer(card);
+			break;
+		default:
+			break;
+		}
+
+	iowrite8(v, priv->reg_base + port);
+}
+
+/*
+ * read a register from the common area
+ */
+static u8 pcan_read_reg(struct pcan_pccard *card, int port)
+{
+	return ioread8(card->ioport_addr + PCC_COMN_OFF + port);
+}
+
+/*
+ * write a register into the common area
+ */
+static void pcan_write_reg(struct pcan_pccard *card, int port, u8 v)
+{
+	/* cache ccr value */
+	if (port == PCC_CCR) {
+		if (card->ccr == v)
+			return;
+		card->ccr = v;
+	}
+
+	iowrite8(v, card->ioport_addr + PCC_COMN_OFF + port);
+}
+
+/*
+ * wait for SPI engine while it is busy
+ */
+static int pcan_wait_spi_busy(struct pcan_pccard *card)
+{
+	unsigned long timeout = jiffies +
+				msecs_to_jiffies(PCC_SPI_MAX_BUSY_WAIT_MS) + 1;
+
+	/* be sure to read status at least once after sleeping */
+	while (pcan_read_reg(card, PCC_CSR) & PCC_CSR_SPI_BUSY) {
+		if (jiffies >= timeout)
+			return -EBUSY;
+		schedule();
+	}
+
+	return 0;
+}
+
+/*
+ * write data in device eeprom
+ */
+static int pcan_write_eeprom(struct pcan_pccard *card, u16 addr, u8 v)
+{
+	u8 status;
+	int err, i;
+
+	/* write instruction enabling write */
+	pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_WREN);
+	err = pcan_wait_spi_busy(card);
+	if (err)
+		goto we_spi_err;
+
+	/* wait until write enabled */
+	for (i = 0; i < PCC_WRITE_MAX_LOOP; i++) {
+		/* write instruction reading the status register */
+		pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_RDSR);
+		err = pcan_wait_spi_busy(card);
+		if (err)
+			goto we_spi_err;
+
+		/* get status register value and check write enable bit */
+		status = pcan_read_reg(card, PCC_SPI_DIR);
+		if (status & PCC_EEP_SR_WEN)
+			break;
+	}
+
+	if (i >= PCC_WRITE_MAX_LOOP) {
+		dev_err(&card->pdev->dev,
+			"stop waiting to be allowed to write in eeprom\n");
+		return -EIO;
+	}
+
+	/* set address and data */
+	pcan_write_reg(card, PCC_SPI_ADR, addr & 0xff);
+	pcan_write_reg(card, PCC_SPI_DOR, v);
+
+	/*
+	 * write instruction with bit[3] set according to address value:
+	 * if addr refers to upper half of the memory array: bit[3] = 1
+	 */
+	pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_WRITE(addr));
+	err = pcan_wait_spi_busy(card);
+	if (err)
+		goto we_spi_err;
+
+	/* wait while write in progress */
+	for (i = 0; i < PCC_WRITE_MAX_LOOP; i++) {
+		/* write instruction reading the status register */
+		pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_RDSR);
+		err = pcan_wait_spi_busy(card);
+		if (err)
+			goto we_spi_err;
+
+		/* get status register value and check write in progress bit */
+		status = pcan_read_reg(card, PCC_SPI_DIR);
+		if (!(status & PCC_EEP_SR_WIP))
+			break;
+	}
+
+	if (i >= PCC_WRITE_MAX_LOOP) {
+		dev_err(&card->pdev->dev,
+			"stop waiting for write in eeprom to complete\n");
+		return -EIO;
+	}
+
+	/* write instruction disabling write */
+	pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_WRDI);
+	err = pcan_wait_spi_busy(card);
+	if (err)
+		goto we_spi_err;
+
+	return 0;
+
+we_spi_err:
+	dev_err(&card->pdev->dev,
+		"stop waiting (spi engine always busy) err %d\n", err);
+
+	return err;
+}
+
+static void pcan_set_leds(struct pcan_pccard *card, u8 led_mask, u8 state)
+{
+	u8 ccr = card->ccr;
+	int i;
+
+	for (i = 0; i < card->chan_count; i++)
+		if (led_mask & PCC_LED(i)) {
+			/* clear corresponding led bits in ccr */
+			ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
+			/* then set new bits */
+			ccr |= PCC_CCR_LED_CHAN(state, i);
+		}
+
+	/* real write only if something has changed in ccr */
+	pcan_write_reg(card, PCC_CCR, ccr);
+}
+
+/*
+ * enable/disable CAN connectors power
+ */
+static inline void pcan_set_can_power(struct pcan_pccard *card, int onoff)
+{
+	int err = pcan_write_eeprom(card, 0, (onoff) ? 1 : 0);
+	if (err)
+		dev_err(&card->pdev->dev,
+			"failed setting power %s to can connectors (err %d)\n",
+			(onoff) ? "on" : "off", err);
+}
+
+/*
+ * set leds state according to channel activity
+ */
+static void pcan_led_timer(unsigned long arg)
+{
+	struct pcan_pccard *card = (struct pcan_pccard *)arg;
+	struct net_device *netdev;
+	u8 ccr = card->ccr;
+	int i, up_count = 0;
+
+	for (i = 0; i < card->chan_count; i++) {
+		/* default is: not configured */
+		ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
+		ccr |= PCC_CCR_LED_ON_CHAN(i);
+
+		netdev = card->channel[i].netdev;
+		if (!netdev || !(netdev->flags & IFF_UP))
+			continue;
+
+		up_count++;
+
+		/* no activity (but configured) */
+		ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
+		ccr |= PCC_CCR_LED_SLOW_CHAN(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;
+			ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
+			ccr |= PCC_CCR_LED_FAST_CHAN(i);
+		}
+		if (netdev->stats.tx_bytes != card->channel[i].prev_tx_bytes) {
+			card->channel[i].prev_tx_bytes = netdev->stats.tx_bytes;
+			ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
+			ccr |= PCC_CCR_LED_FAST_CHAN(i);
+		}
+	}
+
+	/* write the new leds state */
+	pcan_write_reg(card, PCC_CCR, ccr);
+
+	/* restart timer (except if no more configured channels) */
+	if (up_count)
+		mod_timer(&card->led_timer, jiffies + HZ);
+}
+
+/*
+ * interrupt service routine
+ */
+static irqreturn_t pcan_isr(int irq, void *dev_id)
+{
+	struct pcan_pccard *card = dev_id;
+	int irq_handled;
+
+	/* prevent from infinite loop */
+	for (irq_handled = 0; irq_handled < PCC_ISR_MAX_LOOP; irq_handled++) {
+		/* handle shared interrupt and next pass */
+		int nothing_to_handle = 1;
+		int i;
+
+		/* check interrupt for each channel */
+		for (i = 0; i < card->chan_count; i++) {
+			/* be sure the netdevice always exists */
+			struct net_device *netdev = card->channel[i].netdev;
+			if (!netdev)
+				continue;
+
+			/*
+			 * if some interrupt from the controller handled,
+			 * should check whether all have been handled or if have
+			 * been stopped because of SJA1000_MAX_IRQ
+			 */
+			if (sja1000_interrupt(irq, netdev) == IRQ_HANDLED)
+				nothing_to_handle = 0;
+		}
+
+		if (nothing_to_handle)
+			break;
+	}
+
+	return (irq_handled) ? IRQ_HANDLED : IRQ_NONE;
+}
+
+/*
+ * free all resources used by the channels and switch off leds and can power
+ */
+static void pcan_free_channels(struct pcan_pccard *card)
+{
+	int i;
+	u8 led_mask = 0;
+
+	for (i = 0; i < card->chan_count; i++) {
+		struct net_device *netdev;
+		char name[IFNAMSIZ];
+
+		led_mask |= PCC_LED(i);
+
+		netdev = card->channel[i].netdev;
+		if (!netdev)
+			continue;
+
+		strncpy(name, netdev->name, IFNAMSIZ);
+		unregister_sja1000dev(netdev);
+		free_sja1000dev(netdev);
+
+		dev_info(&card->pdev->dev, "%s removed\n", name);
+	}
+
+	if (pcmcia_dev_present(card->pdev)) {
+		pcan_set_leds(card, led_mask, PCC_LED_OFF);
+		pcan_set_can_power(card, 0);
+	}
+
+	ioport_unmap(card->ioport_addr);
+}
+
+/*
+ * check if a CAN controller is present at the specified location
+ */
+static inline int pcan_check_channel(struct sja1000_priv *priv)
+{
+	/* make sure SJA1000 is in reset mode */
+	pcan_write_canreg(priv, REG_MOD, 1);
+	pcan_write_canreg(priv, REG_CDR, CDR_PELICAN);
+
+	/* read reset-values */
+	if (pcan_read_canreg(priv, REG_CDR) == CDR_PELICAN)
+		return 1;
+
+	return 0;
+}
+
+static int pcan_add_channels(struct pcan_pccard *card)
+{
+	struct pcmcia_device *pdev = card->pdev;
+	int i, err;
+	u8 ccr = PCC_CCR_INIT;
+
+	/* init common registers (reset channels and leds off) */
+	card->ccr = ~ccr;
+	pcan_write_reg(card, PCC_CCR, ccr);
+
+	/* wait 2ms before unresetting channels */
+	mdelay(2);
+
+	ccr &= ~PCC_CCR_RST_ALL;
+	pcan_write_reg(card, PCC_CCR, ccr);
+
+	/* create one network device per channel detected */
+	for (i = 0; i < ARRAY_SIZE(card->channel); i++) {
+		struct net_device *netdev;
+		struct sja1000_priv *priv;
+
+		netdev = alloc_sja1000dev(0);
+		if (!netdev) {
+			err = -ENOMEM;
+			break;
+		}
+
+		/* update linkages */
+		priv = netdev_priv(netdev);
+		priv->priv = card;
+		SET_NETDEV_DEV(netdev, &pdev->dev);
+
+		priv->irq_flags = IRQF_SHARED;
+		netdev->irq = pdev->irq;
+		priv->reg_base = card->ioport_addr + PCC_CHAN_OFF(i);
+
+		/* check if channel is present */
+		if (!pcan_check_channel(priv)) {
+			dev_err(&pdev->dev, "channel %d not present\n", i);
+			free_sja1000dev(netdev);
+			continue;
+		}
+
+		priv->read_reg  = pcan_read_canreg;
+		priv->write_reg = pcan_write_canreg;
+		priv->can.clock.freq = PCC_CAN_CLOCK;
+		priv->ocr = PCC_OCR;
+		priv->cdr = PCC_CDR;
+
+		/* Neither a slave device distributes the clock */
+		if (i > 0)
+			priv->cdr |= CDR_CLK_OFF;
+
+		priv->flags |= SJA1000_CUSTOM_IRQ_HANDLER;
+
+		/* register SJA1000 device */
+		err = register_sja1000dev(netdev);
+		if (err) {
+			free_sja1000dev(netdev);
+			continue;
+		}
+
+		card->channel[i].netdev = netdev;
+		card->chan_count++;
+
+		/* set corresponding led on in the new ccr */
+		ccr &= ~PCC_CCR_LED_OFF_CHAN(i);
+
+		dev_info(&pdev->dev,
+			"registered %s on channel %d at 0x%p irq %d\n",
+			netdev->name, i, priv->reg_base, pdev->irq);
+	}
+
+	/* write new ccr (change leds state) */
+	pcan_write_reg(card, PCC_CCR, ccr);
+
+	return err;
+}
+
+static int pcan_conf_check(struct pcmcia_device *pdev, void *priv_data)
+{
+	pdev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
+	pdev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8; /* only */
+	pdev->io_lines = 10;
+
+	/* This reserves IO space but doesn't actually enable it */
+	return pcmcia_request_io(pdev);
+}
+
+/*
+ * free all resources used by the device
+ */
+static void pcan_free(struct pcmcia_device *pdev)
+{
+	if (!pdev->priv)
+		return;
+
+	pcan_stop_led_timer(pdev->priv);
+	free_irq(pdev->irq, pdev->priv);
+	pcan_free_channels(pdev->priv);
+
+	kfree(pdev->priv);
+	pdev->priv = NULL;
+}
+
+/*
+ * setup PCMCIA socket and probe for PEAK-System PC-CARD
+ */
+static int __devinit pcan_probe(struct pcmcia_device *pdev)
+{
+	struct pcan_pccard *card;
+	int err;
+
+	pdev->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
+
+	err = pcmcia_loop_config(pdev, pcan_conf_check, NULL);
+	if (err) {
+		dev_err(&pdev->dev, "pcmcia_loop_config() error %d\n", err);
+		goto probe_err_1;
+	}
+
+	dev_info(&pdev->dev, "new PEAK-System pcmcia card detected: %s %s:\n",
+		pdev->prod_id[0] ? pdev->prod_id[0] : "PEAK-System",
+		pdev->prod_id[1] ? pdev->prod_id[1] : "PCAN-PC Card");
+
+	if (!pdev->irq) {
+		dev_err(&pdev->dev, "no irq assigned\n");
+		err = -ENODEV;
+		goto probe_err_1;
+	}
+
+	err = pcmcia_enable_device(pdev);
+	if (err) {
+		dev_err(&pdev->dev, "pcmcia_enable_device failed err=%d\n",
+			err);
+		goto probe_err_1;
+	}
+
+	card = kzalloc(sizeof(struct pcan_pccard), GFP_KERNEL);
+	if (!card) {
+		dev_err(&pdev->dev, "couldn't allocated card memory\n");
+		err = -ENOMEM;
+		goto probe_err_2;
+	}
+
+	card->pdev = pdev;
+	pdev->priv = card;
+
+	/* sja1000 api uses iomem */
+	card->ioport_addr = ioport_map(pdev->resource[0]->start,
+					resource_size(pdev->resource[0]));
+	if (!card->ioport_addr) {
+		err = -ENOMEM;
+		goto probe_err_3;
+	}
+
+	/* display firware version */
+	dev_info(&pdev->dev, "firmware %d.%d\n",
+		pcan_read_reg(card, PCC_FW_MAJOR),
+		pcan_read_reg(card, PCC_FW_MINOR));
+
+	/* detect available channels */
+	pcan_add_channels(card);
+	if (!card->chan_count) {
+		ioport_unmap(card->ioport_addr);
+		goto probe_err_3;
+	}
+
+	/* init the timer which controls the leds */
+	init_timer(&card->led_timer);
+	card->led_timer.function = pcan_led_timer;
+	card->led_timer.data = (unsigned long)card;
+
+	/* request the given irq */
+	err = request_irq(pdev->irq, &pcan_isr, IRQF_SHARED, PCC_NAME, card);
+	if (err)
+		goto probe_err_4;
+
+	/* power on the connectors */
+	pcan_set_can_power(card, 1);
+
+	return 0;
+
+probe_err_4:
+	/* unregister can devices from network */
+	pcan_free_channels(card);
+
+probe_err_3:
+	kfree(card);
+	pdev->priv = NULL;
+
+probe_err_2:
+	pcmcia_disable_device(pdev);
+
+probe_err_1:
+	return err;
+}
+
+/*
+ * release claimed resources
+ */
+static void pcan_remove(struct pcmcia_device *pdev)
+{
+	pcan_free(pdev);
+	pcmcia_disable_device(pdev);
+}
+
+static struct pcmcia_driver pcan_driver = {
+	.name = PCC_NAME,
+	.probe = pcan_probe,
+	.remove = pcan_remove,
+	.id_table = pcan_table,
+};
+
+static int __init pcan_init(void)
+{
+	return pcmcia_register_driver(&pcan_driver);
+}
+module_init(pcan_init);
+
+static void __exit pcan_exit(void)
+{
+	pcmcia_unregister_driver(&pcan_driver);
+}
+module_exit(pcan_exit);
-- 
1.7.5.4