Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 314 insertions, 0 deletions

diff --git a/drivers/net/can/sja1000/sja1000_isa.c b/drivers/net/can/sja1000/sja1000_isa.c
new file mode 100644
index 000000000..db3e767d5
--- /dev/null
+++ b/drivers/net/can/sja1000/sja1000_isa.c
@@ -0,0 +1,314 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2009 Wolfgang Grandegger <wg@grandegger.com>
+ */
+
+#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_hw_array(port, ulong, ioport, NULL, 0444);
+MODULE_PARM_DESC(port, "I/O port number");
+
+module_param_hw_array(mem, ulong, iomem, NULL, 0444);
+MODULE_PARM_DESC(mem, "I/O memory address");
+
+module_param_hw_array(indirect, int, ioport, NULL, 0444);
+MODULE_PARM_DESC(indirect, "Indirect access via address and data port");
+
+module_param_hw_array(irq, int, irq, NULL, 0444);
+MODULE_PARM_DESC(irq, "IRQ number");
+
+module_param_array(clk, int, NULL, 0444);
+MODULE_PARM_DESC(clk, "External oscillator clock frequency "
+		 "(default=16000000 [16 MHz])");
+
+module_param_array(cdr, byte, NULL, 0444);
+MODULE_PARM_DESC(cdr, "Clock divider register "
+		 "(default=0x48 [CDR_CBP | CDR_CLK_OFF])");
+
+module_param_array(ocr, byte, NULL, 0444);
+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(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_free;
+	}
+
+	dev_info(&pdev->dev, "%s device registered (reg_base=0x%p, irq=%d)\n",
+		 DRV_NAME, priv->reg_base, dev->irq);
+	return 0;
+
+exit_free:
+	free_sja1000dev(dev);
+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);