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312 lines
7.6 KiB
312 lines
7.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2009 Wolfgang Grandegger <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/interrupt.h> |
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#include <linux/netdevice.h> |
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#include <linux/delay.h> |
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#include <linux/irq.h> |
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#include <linux/io.h> |
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#include <linux/can/dev.h> |
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#include <linux/can/platform/sja1000.h> |
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#include "sja1000.h" |
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#define DRV_NAME "sja1000_isa" |
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#define MAXDEV 8 |
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MODULE_AUTHOR("Wolfgang Grandegger <[email protected]>"); |
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MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the ISA bus"); |
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MODULE_LICENSE("GPL v2"); |
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#define CLK_DEFAULT 16000000 /* 16 MHz */ |
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#define CDR_DEFAULT (CDR_CBP | CDR_CLK_OFF) |
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#define OCR_DEFAULT OCR_TX0_PUSHPULL |
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static unsigned long port[MAXDEV]; |
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static unsigned long mem[MAXDEV]; |
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static int irq[MAXDEV]; |
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static int clk[MAXDEV]; |
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static unsigned char cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff}; |
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static unsigned char ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff}; |
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static int indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1}; |
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static spinlock_t indirect_lock[MAXDEV]; /* lock for indirect access mode */ |
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module_param_hw_array(port, ulong, ioport, NULL, 0444); |
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MODULE_PARM_DESC(port, "I/O port number"); |
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module_param_hw_array(mem, ulong, iomem, NULL, 0444); |
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MODULE_PARM_DESC(mem, "I/O memory address"); |
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module_param_hw_array(indirect, int, ioport, NULL, 0444); |
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MODULE_PARM_DESC(indirect, "Indirect access via address and data port"); |
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module_param_hw_array(irq, int, irq, NULL, 0444); |
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MODULE_PARM_DESC(irq, "IRQ number"); |
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module_param_array(clk, int, NULL, 0444); |
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MODULE_PARM_DESC(clk, "External oscillator clock frequency " |
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"(default=16000000 [16 MHz])"); |
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module_param_array(cdr, byte, NULL, 0444); |
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MODULE_PARM_DESC(cdr, "Clock divider register " |
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"(default=0x48 [CDR_CBP | CDR_CLK_OFF])"); |
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module_param_array(ocr, byte, NULL, 0444); |
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MODULE_PARM_DESC(ocr, "Output control register " |
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"(default=0x18 [OCR_TX0_PUSHPULL])"); |
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#define SJA1000_IOSIZE 0x20 |
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#define SJA1000_IOSIZE_INDIRECT 0x02 |
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static struct platform_device *sja1000_isa_devs[MAXDEV]; |
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static u8 sja1000_isa_mem_read_reg(const struct sja1000_priv *priv, int reg) |
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{ |
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return readb(priv->reg_base + reg); |
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} |
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static void sja1000_isa_mem_write_reg(const struct sja1000_priv *priv, |
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int reg, u8 val) |
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{ |
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writeb(val, priv->reg_base + reg); |
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} |
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static u8 sja1000_isa_port_read_reg(const struct sja1000_priv *priv, int reg) |
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{ |
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return inb((unsigned long)priv->reg_base + reg); |
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} |
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static void sja1000_isa_port_write_reg(const struct sja1000_priv *priv, |
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int reg, u8 val) |
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{ |
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outb(val, (unsigned long)priv->reg_base + reg); |
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} |
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static u8 sja1000_isa_port_read_reg_indirect(const struct sja1000_priv *priv, |
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int reg) |
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{ |
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unsigned long flags, base = (unsigned long)priv->reg_base; |
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u8 readval; |
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spin_lock_irqsave(&indirect_lock[priv->dev->dev_id], flags); |
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outb(reg, base); |
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readval = inb(base + 1); |
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spin_unlock_irqrestore(&indirect_lock[priv->dev->dev_id], flags); |
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return readval; |
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} |
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static void sja1000_isa_port_write_reg_indirect(const struct sja1000_priv *priv, |
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int reg, u8 val) |
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{ |
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unsigned long flags, base = (unsigned long)priv->reg_base; |
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spin_lock_irqsave(&indirect_lock[priv->dev->dev_id], flags); |
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outb(reg, base); |
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outb(val, base + 1); |
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spin_unlock_irqrestore(&indirect_lock[priv->dev->dev_id], flags); |
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} |
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static int sja1000_isa_probe(struct platform_device *pdev) |
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{ |
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struct net_device *dev; |
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struct sja1000_priv *priv; |
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void __iomem *base = NULL; |
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int iosize = SJA1000_IOSIZE; |
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int idx = pdev->id; |
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int err; |
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dev_dbg(&pdev->dev, "probing idx=%d: port=%#lx, mem=%#lx, irq=%d\n", |
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idx, port[idx], mem[idx], irq[idx]); |
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if (mem[idx]) { |
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if (!request_mem_region(mem[idx], iosize, DRV_NAME)) { |
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err = -EBUSY; |
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goto exit; |
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} |
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base = ioremap(mem[idx], iosize); |
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if (!base) { |
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err = -ENOMEM; |
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goto exit_release; |
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} |
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} else { |
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if (indirect[idx] > 0 || |
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(indirect[idx] == -1 && indirect[0] > 0)) |
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iosize = SJA1000_IOSIZE_INDIRECT; |
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if (!request_region(port[idx], iosize, DRV_NAME)) { |
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err = -EBUSY; |
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goto exit; |
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} |
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} |
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dev = alloc_sja1000dev(0); |
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if (!dev) { |
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err = -ENOMEM; |
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goto exit_unmap; |
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} |
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priv = netdev_priv(dev); |
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dev->irq = irq[idx]; |
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priv->irq_flags = IRQF_SHARED; |
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if (mem[idx]) { |
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priv->reg_base = base; |
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dev->base_addr = mem[idx]; |
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priv->read_reg = sja1000_isa_mem_read_reg; |
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priv->write_reg = sja1000_isa_mem_write_reg; |
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} else { |
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priv->reg_base = (void __iomem *)port[idx]; |
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dev->base_addr = port[idx]; |
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if (iosize == SJA1000_IOSIZE_INDIRECT) { |
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priv->read_reg = sja1000_isa_port_read_reg_indirect; |
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priv->write_reg = sja1000_isa_port_write_reg_indirect; |
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spin_lock_init(&indirect_lock[idx]); |
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} else { |
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priv->read_reg = sja1000_isa_port_read_reg; |
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priv->write_reg = sja1000_isa_port_write_reg; |
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} |
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} |
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if (clk[idx]) |
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priv->can.clock.freq = clk[idx] / 2; |
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else if (clk[0]) |
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priv->can.clock.freq = clk[0] / 2; |
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else |
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priv->can.clock.freq = CLK_DEFAULT / 2; |
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if (ocr[idx] != 0xff) |
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priv->ocr = ocr[idx]; |
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else if (ocr[0] != 0xff) |
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priv->ocr = ocr[0]; |
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else |
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priv->ocr = OCR_DEFAULT; |
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if (cdr[idx] != 0xff) |
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priv->cdr = cdr[idx]; |
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else if (cdr[0] != 0xff) |
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priv->cdr = cdr[0]; |
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else |
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priv->cdr = CDR_DEFAULT; |
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platform_set_drvdata(pdev, dev); |
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SET_NETDEV_DEV(dev, &pdev->dev); |
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dev->dev_id = idx; |
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err = register_sja1000dev(dev); |
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if (err) { |
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dev_err(&pdev->dev, "registering %s failed (err=%d)\n", |
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DRV_NAME, err); |
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goto exit_unmap; |
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} |
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dev_info(&pdev->dev, "%s device registered (reg_base=0x%p, irq=%d)\n", |
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DRV_NAME, priv->reg_base, dev->irq); |
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return 0; |
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exit_unmap: |
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if (mem[idx]) |
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iounmap(base); |
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exit_release: |
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if (mem[idx]) |
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release_mem_region(mem[idx], iosize); |
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else |
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release_region(port[idx], iosize); |
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exit: |
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return err; |
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} |
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static int sja1000_isa_remove(struct platform_device *pdev) |
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{ |
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struct net_device *dev = platform_get_drvdata(pdev); |
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struct sja1000_priv *priv = netdev_priv(dev); |
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int idx = pdev->id; |
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unregister_sja1000dev(dev); |
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if (mem[idx]) { |
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iounmap(priv->reg_base); |
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release_mem_region(mem[idx], SJA1000_IOSIZE); |
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} else { |
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if (priv->read_reg == sja1000_isa_port_read_reg_indirect) |
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release_region(port[idx], SJA1000_IOSIZE_INDIRECT); |
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else |
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release_region(port[idx], SJA1000_IOSIZE); |
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} |
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free_sja1000dev(dev); |
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return 0; |
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} |
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static struct platform_driver sja1000_isa_driver = { |
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.probe = sja1000_isa_probe, |
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.remove = sja1000_isa_remove, |
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.driver = { |
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.name = DRV_NAME, |
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}, |
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}; |
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static int __init sja1000_isa_init(void) |
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{ |
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int idx, err; |
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for (idx = 0; idx < MAXDEV; idx++) { |
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if ((port[idx] || mem[idx]) && irq[idx]) { |
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sja1000_isa_devs[idx] = |
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platform_device_alloc(DRV_NAME, idx); |
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if (!sja1000_isa_devs[idx]) { |
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err = -ENOMEM; |
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goto exit_free_devices; |
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} |
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err = platform_device_add(sja1000_isa_devs[idx]); |
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if (err) { |
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platform_device_put(sja1000_isa_devs[idx]); |
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goto exit_free_devices; |
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} |
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pr_debug("%s: platform device %d: port=%#lx, mem=%#lx, " |
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"irq=%d\n", |
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DRV_NAME, idx, port[idx], mem[idx], irq[idx]); |
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} else if (idx == 0 || port[idx] || mem[idx]) { |
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pr_err("%s: insufficient parameters supplied\n", |
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DRV_NAME); |
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err = -EINVAL; |
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goto exit_free_devices; |
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} |
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} |
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err = platform_driver_register(&sja1000_isa_driver); |
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if (err) |
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goto exit_free_devices; |
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pr_info("Legacy %s driver for max. %d devices registered\n", |
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DRV_NAME, MAXDEV); |
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return 0; |
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exit_free_devices: |
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while (--idx >= 0) { |
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if (sja1000_isa_devs[idx]) |
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platform_device_unregister(sja1000_isa_devs[idx]); |
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} |
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return err; |
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} |
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static void __exit sja1000_isa_exit(void) |
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{ |
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int idx; |
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platform_driver_unregister(&sja1000_isa_driver); |
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for (idx = 0; idx < MAXDEV; idx++) { |
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if (sja1000_isa_devs[idx]) |
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platform_device_unregister(sja1000_isa_devs[idx]); |
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} |
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} |
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module_init(sja1000_isa_init); |
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module_exit(sja1000_isa_exit);
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