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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) 2009 Wolfgang Grandegger <wg@grandegger.com>4 */5 6#include <linux/kernel.h>7#include <linux/module.h>8#include <linux/platform_device.h>9#include <linux/interrupt.h>10#include <linux/netdevice.h>11#include <linux/delay.h>12#include <linux/irq.h>13#include <linux/io.h>14#include <linux/can/dev.h>15#include <linux/can/platform/sja1000.h>16 17#include "sja1000.h"18 19#define DRV_NAME "sja1000_isa"20 21#define MAXDEV 822 23MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");24MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the ISA bus");25MODULE_LICENSE("GPL v2");26 27#define CLK_DEFAULT 16000000 /* 16 MHz */28#define CDR_DEFAULT (CDR_CBP | CDR_CLK_OFF)29#define OCR_DEFAULT OCR_TX0_PUSHPULL30 31static unsigned long port[MAXDEV];32static unsigned long mem[MAXDEV];33static int irq[MAXDEV];34static int clk[MAXDEV];35static unsigned char cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};36static unsigned char ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};37static int indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};38static spinlock_t indirect_lock[MAXDEV]; /* lock for indirect access mode */39 40module_param_hw_array(port, ulong, ioport, NULL, 0444);41MODULE_PARM_DESC(port, "I/O port number");42 43module_param_hw_array(mem, ulong, iomem, NULL, 0444);44MODULE_PARM_DESC(mem, "I/O memory address");45 46module_param_hw_array(indirect, int, ioport, NULL, 0444);47MODULE_PARM_DESC(indirect, "Indirect access via address and data port");48 49module_param_hw_array(irq, int, irq, NULL, 0444);50MODULE_PARM_DESC(irq, "IRQ number");51 52module_param_array(clk, int, NULL, 0444);53MODULE_PARM_DESC(clk, "External oscillator clock frequency "54 "(default=16000000 [16 MHz])");55 56module_param_array(cdr, byte, NULL, 0444);57MODULE_PARM_DESC(cdr, "Clock divider register "58 "(default=0x48 [CDR_CBP | CDR_CLK_OFF])");59 60module_param_array(ocr, byte, NULL, 0444);61MODULE_PARM_DESC(ocr, "Output control register "62 "(default=0x18 [OCR_TX0_PUSHPULL])");63 64#define SJA1000_IOSIZE 0x2065#define SJA1000_IOSIZE_INDIRECT 0x0266 67static struct platform_device *sja1000_isa_devs[MAXDEV];68 69static u8 sja1000_isa_mem_read_reg(const struct sja1000_priv *priv, int reg)70{71 return readb(priv->reg_base + reg);72}73 74static void sja1000_isa_mem_write_reg(const struct sja1000_priv *priv,75 int reg, u8 val)76{77 writeb(val, priv->reg_base + reg);78}79 80static u8 sja1000_isa_port_read_reg(const struct sja1000_priv *priv, int reg)81{82 return inb((unsigned long)priv->reg_base + reg);83}84 85static void sja1000_isa_port_write_reg(const struct sja1000_priv *priv,86 int reg, u8 val)87{88 outb(val, (unsigned long)priv->reg_base + reg);89}90 91static u8 sja1000_isa_port_read_reg_indirect(const struct sja1000_priv *priv,92 int reg)93{94 unsigned long flags, base = (unsigned long)priv->reg_base;95 u8 readval;96 97 spin_lock_irqsave(&indirect_lock[priv->dev->dev_id], flags);98 outb(reg, base);99 readval = inb(base + 1);100 spin_unlock_irqrestore(&indirect_lock[priv->dev->dev_id], flags);101 102 return readval;103}104 105static void sja1000_isa_port_write_reg_indirect(const struct sja1000_priv *priv,106 int reg, u8 val)107{108 unsigned long flags, base = (unsigned long)priv->reg_base;109 110 spin_lock_irqsave(&indirect_lock[priv->dev->dev_id], flags);111 outb(reg, base);112 outb(val, base + 1);113 spin_unlock_irqrestore(&indirect_lock[priv->dev->dev_id], flags);114}115 116static int sja1000_isa_probe(struct platform_device *pdev)117{118 struct net_device *dev;119 struct sja1000_priv *priv;120 void __iomem *base = NULL;121 int iosize = SJA1000_IOSIZE;122 int idx = pdev->id;123 int err;124 125 dev_dbg(&pdev->dev, "probing idx=%d: port=%#lx, mem=%#lx, irq=%d\n",126 idx, port[idx], mem[idx], irq[idx]);127 128 if (mem[idx]) {129 if (!request_mem_region(mem[idx], iosize, DRV_NAME)) {130 err = -EBUSY;131 goto exit;132 }133 base = ioremap(mem[idx], iosize);134 if (!base) {135 err = -ENOMEM;136 goto exit_release;137 }138 } else {139 if (indirect[idx] > 0 ||140 (indirect[idx] == -1 && indirect[0] > 0))141 iosize = SJA1000_IOSIZE_INDIRECT;142 if (!request_region(port[idx], iosize, DRV_NAME)) {143 err = -EBUSY;144 goto exit;145 }146 }147 148 dev = alloc_sja1000dev(0);149 if (!dev) {150 err = -ENOMEM;151 goto exit_unmap;152 }153 priv = netdev_priv(dev);154 155 dev->irq = irq[idx];156 priv->irq_flags = IRQF_SHARED;157 if (mem[idx]) {158 priv->reg_base = base;159 dev->base_addr = mem[idx];160 priv->read_reg = sja1000_isa_mem_read_reg;161 priv->write_reg = sja1000_isa_mem_write_reg;162 } else {163 priv->reg_base = (void __iomem *)port[idx];164 dev->base_addr = port[idx];165 166 if (iosize == SJA1000_IOSIZE_INDIRECT) {167 priv->read_reg = sja1000_isa_port_read_reg_indirect;168 priv->write_reg = sja1000_isa_port_write_reg_indirect;169 spin_lock_init(&indirect_lock[idx]);170 } else {171 priv->read_reg = sja1000_isa_port_read_reg;172 priv->write_reg = sja1000_isa_port_write_reg;173 }174 }175 176 if (clk[idx])177 priv->can.clock.freq = clk[idx] / 2;178 else if (clk[0])179 priv->can.clock.freq = clk[0] / 2;180 else181 priv->can.clock.freq = CLK_DEFAULT / 2;182 183 if (ocr[idx] != 0xff)184 priv->ocr = ocr[idx];185 else if (ocr[0] != 0xff)186 priv->ocr = ocr[0];187 else188 priv->ocr = OCR_DEFAULT;189 190 if (cdr[idx] != 0xff)191 priv->cdr = cdr[idx];192 else if (cdr[0] != 0xff)193 priv->cdr = cdr[0];194 else195 priv->cdr = CDR_DEFAULT;196 197 platform_set_drvdata(pdev, dev);198 SET_NETDEV_DEV(dev, &pdev->dev);199 dev->dev_id = idx;200 201 err = register_sja1000dev(dev);202 if (err) {203 dev_err(&pdev->dev, "registering %s failed (err=%d)\n",204 DRV_NAME, err);205 goto exit_free;206 }207 208 dev_info(&pdev->dev, "%s device registered (reg_base=0x%p, irq=%d)\n",209 DRV_NAME, priv->reg_base, dev->irq);210 return 0;211 212exit_free:213 free_sja1000dev(dev);214exit_unmap:215 if (mem[idx])216 iounmap(base);217exit_release:218 if (mem[idx])219 release_mem_region(mem[idx], iosize);220 else221 release_region(port[idx], iosize);222exit:223 return err;224}225 226static void sja1000_isa_remove(struct platform_device *pdev)227{228 struct net_device *dev = platform_get_drvdata(pdev);229 struct sja1000_priv *priv = netdev_priv(dev);230 int idx = pdev->id;231 232 unregister_sja1000dev(dev);233 234 if (mem[idx]) {235 iounmap(priv->reg_base);236 release_mem_region(mem[idx], SJA1000_IOSIZE);237 } else {238 if (priv->read_reg == sja1000_isa_port_read_reg_indirect)239 release_region(port[idx], SJA1000_IOSIZE_INDIRECT);240 else241 release_region(port[idx], SJA1000_IOSIZE);242 }243 free_sja1000dev(dev);244}245 246static struct platform_driver sja1000_isa_driver = {247 .probe = sja1000_isa_probe,248 .remove = sja1000_isa_remove,249 .driver = {250 .name = DRV_NAME,251 },252};253 254static int __init sja1000_isa_init(void)255{256 int idx, err;257 258 for (idx = 0; idx < MAXDEV; idx++) {259 if ((port[idx] || mem[idx]) && irq[idx]) {260 sja1000_isa_devs[idx] =261 platform_device_alloc(DRV_NAME, idx);262 if (!sja1000_isa_devs[idx]) {263 err = -ENOMEM;264 goto exit_free_devices;265 }266 err = platform_device_add(sja1000_isa_devs[idx]);267 if (err) {268 platform_device_put(sja1000_isa_devs[idx]);269 goto exit_free_devices;270 }271 pr_debug("%s: platform device %d: port=%#lx, mem=%#lx, "272 "irq=%d\n",273 DRV_NAME, idx, port[idx], mem[idx], irq[idx]);274 } else if (idx == 0 || port[idx] || mem[idx]) {275 pr_err("%s: insufficient parameters supplied\n",276 DRV_NAME);277 err = -EINVAL;278 goto exit_free_devices;279 }280 }281 282 err = platform_driver_register(&sja1000_isa_driver);283 if (err)284 goto exit_free_devices;285 286 pr_info("Legacy %s driver for max. %d devices registered\n",287 DRV_NAME, MAXDEV);288 289 return 0;290 291exit_free_devices:292 while (--idx >= 0) {293 if (sja1000_isa_devs[idx])294 platform_device_unregister(sja1000_isa_devs[idx]);295 }296 297 return err;298}299 300static void __exit sja1000_isa_exit(void)301{302 int idx;303 304 platform_driver_unregister(&sja1000_isa_driver);305 for (idx = 0; idx < MAXDEV; idx++) {306 if (sja1000_isa_devs[idx])307 platform_device_unregister(sja1000_isa_devs[idx]);308 }309}310 311module_init(sja1000_isa_init);312module_exit(sja1000_isa_exit);313