--- /dev/null
+/*
+ * Copyright (C) 2009 Wolfgang Grandegger <wg@grandegger.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the version 2 of the GNU General Public License
+ * as published by the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/netdevice.h>
+#include <linux/delay.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/can/dev.h>
+#include <linux/can/platform/sja1000.h>
+
+#include "sja1000.h"
+
+#define DRV_NAME "sja1000_isa"
+
+#define MAXDEV 8
+
+MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
+MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the ISA bus");
+MODULE_LICENSE("GPL v2");
+
+#define CLK_DEFAULT 16000000 /* 16 MHz */
+#define CDR_DEFAULT (CDR_CBP | CDR_CLK_OFF)
+#define OCR_DEFAULT OCR_TX0_PUSHPULL
+
+static unsigned long port[MAXDEV];
+static unsigned long mem[MAXDEV];
+static int irq[MAXDEV];
+static int clk[MAXDEV];
+static unsigned char cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
+static unsigned char ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
+static int indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
+static spinlock_t indirect_lock[MAXDEV]; /* lock for indirect access mode */
+
+module_param_array(port, ulong, NULL, S_IRUGO);
+MODULE_PARM_DESC(port, "I/O port number");
+
+module_param_array(mem, ulong, NULL, S_IRUGO);
+MODULE_PARM_DESC(mem, "I/O memory address");
+
+module_param_array(indirect, int, NULL, S_IRUGO);
+MODULE_PARM_DESC(indirect, "Indirect access via address and data port");
+
+module_param_array(irq, int, NULL, S_IRUGO);
+MODULE_PARM_DESC(irq, "IRQ number");
+
+module_param_array(clk, int, NULL, S_IRUGO);
+MODULE_PARM_DESC(clk, "External oscillator clock frequency "
+ "(default=16000000 [16 MHz])");
+
+module_param_array(cdr, byte, NULL, S_IRUGO);
+MODULE_PARM_DESC(cdr, "Clock divider register "
+ "(default=0x48 [CDR_CBP | CDR_CLK_OFF])");
+
+module_param_array(ocr, byte, NULL, S_IRUGO);
+MODULE_PARM_DESC(ocr, "Output control register "
+ "(default=0x18 [OCR_TX0_PUSHPULL])");
+
+#define SJA1000_IOSIZE 0x20
+#define SJA1000_IOSIZE_INDIRECT 0x02
+
+static struct platform_device *sja1000_isa_devs[MAXDEV];
+
+static u8 sja1000_isa_mem_read_reg(const struct sja1000_priv *priv, int reg)
+{
+ return readb(priv->reg_base + reg);
+}
+
+static void sja1000_isa_mem_write_reg(const struct sja1000_priv *priv,
+ int reg, u8 val)
+{
+ writeb(val, priv->reg_base + reg);
+}
+
+static u8 sja1000_isa_port_read_reg(const struct sja1000_priv *priv, int reg)
+{
+ return inb((unsigned long)priv->reg_base + reg);
+}
+
+static void sja1000_isa_port_write_reg(const struct sja1000_priv *priv,
+ int reg, u8 val)
+{
+ outb(val, (unsigned long)priv->reg_base + reg);
+}
+
+static u8 sja1000_isa_port_read_reg_indirect(const struct sja1000_priv *priv,
+ int reg)
+{
+ unsigned long flags, base = (unsigned long)priv->reg_base;
+ u8 readval;
+
+ spin_lock_irqsave(&indirect_lock[priv->dev->dev_id], flags);
+ outb(reg, base);
+ readval = inb(base + 1);
+ spin_unlock_irqrestore(&indirect_lock[priv->dev->dev_id], flags);
+
+ return readval;
+}
+
+static void sja1000_isa_port_write_reg_indirect(const struct sja1000_priv *priv,
+ int reg, u8 val)
+{
+ unsigned long flags, base = (unsigned long)priv->reg_base;
+
+ spin_lock_irqsave(&indirect_lock[priv->dev->dev_id], flags);
+ outb(reg, base);
+ outb(val, base + 1);
+ spin_unlock_irqrestore(&indirect_lock[priv->dev->dev_id], flags);
+}
+
+static int sja1000_isa_probe(struct platform_device *pdev)
+{
+ struct net_device *dev;
+ struct sja1000_priv *priv;
+ void __iomem *base = NULL;
+ int iosize = SJA1000_IOSIZE;
+ int idx = pdev->id;
+ int err;
+
+ dev_dbg(&pdev->dev, "probing idx=%d: port=%#lx, mem=%#lx, irq=%d\n",
+ idx, port[idx], mem[idx], irq[idx]);
+
+ if (mem[idx]) {
+ if (!request_mem_region(mem[idx], iosize, DRV_NAME)) {
+ err = -EBUSY;
+ goto exit;
+ }
+ base = ioremap_nocache(mem[idx], iosize);
+ if (!base) {
+ err = -ENOMEM;
+ goto exit_release;
+ }
+ } else {
+ if (indirect[idx] > 0 ||
+ (indirect[idx] == -1 && indirect[0] > 0))
+ iosize = SJA1000_IOSIZE_INDIRECT;
+ if (!request_region(port[idx], iosize, DRV_NAME)) {
+ err = -EBUSY;
+ goto exit;
+ }
+ }
+
+ dev = alloc_sja1000dev(0);
+ if (!dev) {
+ err = -ENOMEM;
+ goto exit_unmap;
+ }
+ priv = netdev_priv(dev);
+
+ dev->irq = irq[idx];
+ priv->irq_flags = IRQF_SHARED;
+ if (mem[idx]) {
+ priv->reg_base = base;
+ dev->base_addr = mem[idx];
+ priv->read_reg = sja1000_isa_mem_read_reg;
+ priv->write_reg = sja1000_isa_mem_write_reg;
+ } else {
+ priv->reg_base = (void __iomem *)port[idx];
+ dev->base_addr = port[idx];
+
+ if (iosize == SJA1000_IOSIZE_INDIRECT) {
+ priv->read_reg = sja1000_isa_port_read_reg_indirect;
+ priv->write_reg = sja1000_isa_port_write_reg_indirect;
+ spin_lock_init(&indirect_lock[idx]);
+ } else {
+ priv->read_reg = sja1000_isa_port_read_reg;
+ priv->write_reg = sja1000_isa_port_write_reg;
+ }
+ }
+
+ if (clk[idx])
+ priv->can.clock.freq = clk[idx] / 2;
+ else if (clk[0])
+ priv->can.clock.freq = clk[0] / 2;
+ else
+ priv->can.clock.freq = CLK_DEFAULT / 2;
+
+ if (ocr[idx] != 0xff)
+ priv->ocr = ocr[idx];
+ else if (ocr[0] != 0xff)
+ priv->ocr = ocr[0];
+ else
+ priv->ocr = OCR_DEFAULT;
+
+ if (cdr[idx] != 0xff)
+ priv->cdr = cdr[idx];
+ else if (cdr[0] != 0xff)
+ priv->cdr = cdr[0];
+ else
+ priv->cdr = CDR_DEFAULT;
+
+ platform_set_drvdata(pdev, dev);
+ SET_NETDEV_DEV(dev, &pdev->dev);
+ dev->dev_id = idx;
+
+ err = register_sja1000dev(dev);
+ if (err) {
+ dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
+ DRV_NAME, err);
+ goto exit_unmap;
+ }
+
+ dev_info(&pdev->dev, "%s device registered (reg_base=0x%p, irq=%d)\n",
+ DRV_NAME, priv->reg_base, dev->irq);
+ return 0;
+
+ exit_unmap:
+ if (mem[idx])
+ iounmap(base);
+ exit_release:
+ if (mem[idx])
+ release_mem_region(mem[idx], iosize);
+ else
+ release_region(port[idx], iosize);
+ exit:
+ return err;
+}
+
+static int sja1000_isa_remove(struct platform_device *pdev)
+{
+ struct net_device *dev = platform_get_drvdata(pdev);
+ struct sja1000_priv *priv = netdev_priv(dev);
+ int idx = pdev->id;
+
+ unregister_sja1000dev(dev);
+
+ if (mem[idx]) {
+ iounmap(priv->reg_base);
+ release_mem_region(mem[idx], SJA1000_IOSIZE);
+ } else {
+ if (priv->read_reg == sja1000_isa_port_read_reg_indirect)
+ release_region(port[idx], SJA1000_IOSIZE_INDIRECT);
+ else
+ release_region(port[idx], SJA1000_IOSIZE);
+ }
+ free_sja1000dev(dev);
+
+ return 0;
+}
+
+static struct platform_driver sja1000_isa_driver = {
+ .probe = sja1000_isa_probe,
+ .remove = sja1000_isa_remove,
+ .driver = {
+ .name = DRV_NAME,
+ },
+};
+
+static int __init sja1000_isa_init(void)
+{
+ int idx, err;
+
+ for (idx = 0; idx < MAXDEV; idx++) {
+ if ((port[idx] || mem[idx]) && irq[idx]) {
+ sja1000_isa_devs[idx] =
+ platform_device_alloc(DRV_NAME, idx);
+ if (!sja1000_isa_devs[idx]) {
+ err = -ENOMEM;
+ goto exit_free_devices;
+ }
+ err = platform_device_add(sja1000_isa_devs[idx]);
+ if (err) {
+ platform_device_put(sja1000_isa_devs[idx]);
+ goto exit_free_devices;
+ }
+ pr_debug("%s: platform device %d: port=%#lx, mem=%#lx, "
+ "irq=%d\n",
+ DRV_NAME, idx, port[idx], mem[idx], irq[idx]);
+ } else if (idx == 0 || port[idx] || mem[idx]) {
+ pr_err("%s: insufficient parameters supplied\n",
+ DRV_NAME);
+ err = -EINVAL;
+ goto exit_free_devices;
+ }
+ }
+
+ err = platform_driver_register(&sja1000_isa_driver);
+ if (err)
+ goto exit_free_devices;
+
+ pr_info("Legacy %s driver for max. %d devices registered\n",
+ DRV_NAME, MAXDEV);
+
+ return 0;
+
+exit_free_devices:
+ while (--idx >= 0) {
+ if (sja1000_isa_devs[idx])
+ platform_device_unregister(sja1000_isa_devs[idx]);
+ }
+
+ return err;
+}
+
+static void __exit sja1000_isa_exit(void)
+{
+ int idx;
+
+ platform_driver_unregister(&sja1000_isa_driver);
+ for (idx = 0; idx < MAXDEV; idx++) {
+ if (sja1000_isa_devs[idx])
+ platform_device_unregister(sja1000_isa_devs[idx]);
+ }
+}
+
+module_init(sja1000_isa_init);
+module_exit(sja1000_isa_exit);
Code Review / kvmfornfv.git / blobdiff