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371 lines
9.2 KiB
371 lines
9.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Driver for CC770 and AN82527 CAN controllers on the legacy ISA bus |
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* |
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* Copyright (C) 2009, 2011 Wolfgang Grandegger <[email protected]> |
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*/ |
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/* |
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* Bosch CC770 and Intel AN82527 CAN controllers on the ISA or PC-104 bus. |
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* The I/O port or memory address and the IRQ number must be specified via |
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* module parameters: |
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* |
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* insmod cc770_isa.ko port=0x310,0x380 irq=7,11 |
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* |
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* for ISA devices using I/O ports or: |
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* |
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* insmod cc770_isa.ko mem=0xd1000,0xd1000 irq=7,11 |
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* |
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* for memory mapped ISA devices. |
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* |
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* Indirect access via address and data port is supported as well: |
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* |
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* insmod cc770_isa.ko port=0x310,0x380 indirect=1 irq=7,11 |
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* |
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* Furthermore, the following mode parameter can be defined: |
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* |
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* clk: External oscillator clock frequency (default=16000000 [16 MHz]) |
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* cir: CPU interface register (default=0x40 [DSC]) |
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* bcr: Bus configuration register (default=0x40 [CBY]) |
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* cor: Clockout register (default=0x00) |
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* |
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* Note: for clk, cir, bcr and cor, the first argument re-defines the |
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* default for all other devices, e.g.: |
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* |
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* insmod cc770_isa.ko mem=0xd1000,0xd1000 irq=7,11 clk=24000000 |
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* |
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* is equivalent to |
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* |
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* insmod cc770_isa.ko mem=0xd1000,0xd1000 irq=7,11 clk=24000000,24000000 |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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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.h> |
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#include <linux/can/dev.h> |
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#include <linux/can/platform/cc770.h> |
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#include "cc770.h" |
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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 CC770 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 COR_DEFAULT 0x00 |
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#define BCR_DEFAULT BUSCFG_CBY |
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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 u8 cir[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff}; |
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static u8 cor[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff}; |
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static u8 bcr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff}; |
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static int indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1}; |
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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(cir, byte, NULL, 0444); |
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MODULE_PARM_DESC(cir, "CPU interface register (default=0x40 [DSC])"); |
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module_param_array(cor, byte, NULL, 0444); |
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MODULE_PARM_DESC(cor, "Clockout register (default=0x00)"); |
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module_param_array(bcr, byte, NULL, 0444); |
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MODULE_PARM_DESC(bcr, "Bus configuration register (default=0x40 [CBY])"); |
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#define CC770_IOSIZE 0x20 |
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#define CC770_IOSIZE_INDIRECT 0x02 |
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/* Spinlock for cc770_isa_port_write_reg_indirect |
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* and cc770_isa_port_read_reg_indirect |
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*/ |
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static DEFINE_SPINLOCK(cc770_isa_port_lock); |
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static struct platform_device *cc770_isa_devs[MAXDEV]; |
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static u8 cc770_isa_mem_read_reg(const struct cc770_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 cc770_isa_mem_write_reg(const struct cc770_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 cc770_isa_port_read_reg(const struct cc770_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 cc770_isa_port_write_reg(const struct cc770_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 cc770_isa_port_read_reg_indirect(const struct cc770_priv *priv, |
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int reg) |
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{ |
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unsigned long base = (unsigned long)priv->reg_base; |
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unsigned long flags; |
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u8 val; |
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spin_lock_irqsave(&cc770_isa_port_lock, flags); |
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outb(reg, base); |
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val = inb(base + 1); |
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spin_unlock_irqrestore(&cc770_isa_port_lock, flags); |
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return val; |
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} |
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static void cc770_isa_port_write_reg_indirect(const struct cc770_priv *priv, |
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int reg, u8 val) |
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{ |
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unsigned long base = (unsigned long)priv->reg_base; |
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unsigned long flags; |
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spin_lock_irqsave(&cc770_isa_port_lock, flags); |
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outb(reg, base); |
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outb(val, base + 1); |
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spin_unlock_irqrestore(&cc770_isa_port_lock, flags); |
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} |
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static int cc770_isa_probe(struct platform_device *pdev) |
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{ |
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struct net_device *dev; |
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struct cc770_priv *priv; |
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void __iomem *base = NULL; |
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int iosize = CC770_IOSIZE; |
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int idx = pdev->id; |
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int err; |
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u32 clktmp; |
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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, KBUILD_MODNAME)) { |
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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 = CC770_IOSIZE_INDIRECT; |
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if (!request_region(port[idx], iosize, KBUILD_MODNAME)) { |
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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_cc770dev(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 = cc770_isa_mem_read_reg; |
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priv->write_reg = cc770_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 == CC770_IOSIZE_INDIRECT) { |
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priv->read_reg = cc770_isa_port_read_reg_indirect; |
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priv->write_reg = cc770_isa_port_write_reg_indirect; |
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} else { |
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priv->read_reg = cc770_isa_port_read_reg; |
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priv->write_reg = cc770_isa_port_write_reg; |
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} |
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} |
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if (clk[idx]) |
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clktmp = clk[idx]; |
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else if (clk[0]) |
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clktmp = clk[0]; |
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else |
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clktmp = CLK_DEFAULT; |
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priv->can.clock.freq = clktmp; |
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if (cir[idx] != 0xff) { |
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priv->cpu_interface = cir[idx]; |
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} else if (cir[0] != 0xff) { |
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priv->cpu_interface = cir[0]; |
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} else { |
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/* The system clock may not exceed 10 MHz */ |
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if (clktmp > 10000000) { |
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priv->cpu_interface |= CPUIF_DSC; |
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clktmp /= 2; |
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} |
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/* The memory clock may not exceed 8 MHz */ |
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if (clktmp > 8000000) |
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priv->cpu_interface |= CPUIF_DMC; |
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} |
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if (priv->cpu_interface & CPUIF_DSC) |
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priv->can.clock.freq /= 2; |
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if (bcr[idx] != 0xff) |
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priv->bus_config = bcr[idx]; |
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else if (bcr[0] != 0xff) |
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priv->bus_config = bcr[0]; |
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else |
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priv->bus_config = BCR_DEFAULT; |
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if (cor[idx] != 0xff) |
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priv->clkout = cor[idx]; |
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else if (cor[0] != 0xff) |
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priv->clkout = cor[0]; |
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else |
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priv->clkout = COR_DEFAULT; |
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platform_set_drvdata(pdev, dev); |
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SET_NETDEV_DEV(dev, &pdev->dev); |
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err = register_cc770dev(dev); |
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if (err) { |
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dev_err(&pdev->dev, |
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"couldn't register device (err=%d)\n", err); |
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goto exit_unmap; |
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} |
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dev_info(&pdev->dev, "device registered (reg_base=0x%p, irq=%d)\n", |
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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 cc770_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 cc770_priv *priv = netdev_priv(dev); |
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int idx = pdev->id; |
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unregister_cc770dev(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], CC770_IOSIZE); |
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} else { |
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if (priv->read_reg == cc770_isa_port_read_reg_indirect) |
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release_region(port[idx], CC770_IOSIZE_INDIRECT); |
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else |
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release_region(port[idx], CC770_IOSIZE); |
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} |
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free_cc770dev(dev); |
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return 0; |
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} |
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static struct platform_driver cc770_isa_driver = { |
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.probe = cc770_isa_probe, |
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.remove = cc770_isa_remove, |
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.driver = { |
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.name = KBUILD_MODNAME, |
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}, |
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}; |
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static int __init cc770_isa_init(void) |
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{ |
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int idx, err; |
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for (idx = 0; idx < ARRAY_SIZE(cc770_isa_devs); idx++) { |
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if ((port[idx] || mem[idx]) && irq[idx]) { |
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cc770_isa_devs[idx] = |
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platform_device_alloc(KBUILD_MODNAME, idx); |
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if (!cc770_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(cc770_isa_devs[idx]); |
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if (err) { |
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platform_device_put(cc770_isa_devs[idx]); |
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goto exit_free_devices; |
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} |
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pr_debug("platform device %d: port=%#lx, mem=%#lx, " |
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"irq=%d\n", |
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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("insufficient parameters supplied\n"); |
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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(&cc770_isa_driver); |
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if (err) |
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goto exit_free_devices; |
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pr_info("driver for max. %d devices registered\n", 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 (cc770_isa_devs[idx]) |
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platform_device_unregister(cc770_isa_devs[idx]); |
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} |
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return err; |
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} |
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module_init(cc770_isa_init); |
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static void __exit cc770_isa_exit(void) |
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{ |
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int idx; |
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platform_driver_unregister(&cc770_isa_driver); |
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for (idx = 0; idx < ARRAY_SIZE(cc770_isa_devs); idx++) { |
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if (cc770_isa_devs[idx]) |
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platform_device_unregister(cc770_isa_devs[idx]); |
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} |
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} |
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module_exit(cc770_isa_exit);
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