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0006 #include <linux/kernel.h>
0007 #include <linux/module.h>
0008 #include <linux/platform_device.h>
0009 #include <linux/interrupt.h>
0010 #include <linux/netdevice.h>
0011 #include <linux/delay.h>
0012 #include <linux/irq.h>
0013 #include <linux/io.h>
0014 #include <linux/can/dev.h>
0015 #include <linux/can/platform/sja1000.h>
0016
0017 #include "sja1000.h"
0018
0019 #define DRV_NAME "sja1000_isa"
0020
0021 #define MAXDEV 8
0022
0023 MODULE_AUTHOR("Wolfgang Grandegger <wg@grandegger.com>");
0024 MODULE_DESCRIPTION("Socket-CAN driver for SJA1000 on the ISA bus");
0025 MODULE_LICENSE("GPL v2");
0026
0027 #define CLK_DEFAULT 16000000
0028 #define CDR_DEFAULT (CDR_CBP | CDR_CLK_OFF)
0029 #define OCR_DEFAULT OCR_TX0_PUSHPULL
0030
0031 static unsigned long port[MAXDEV];
0032 static unsigned long mem[MAXDEV];
0033 static int irq[MAXDEV];
0034 static int clk[MAXDEV];
0035 static unsigned char cdr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
0036 static unsigned char ocr[MAXDEV] = {[0 ... (MAXDEV - 1)] = 0xff};
0037 static int indirect[MAXDEV] = {[0 ... (MAXDEV - 1)] = -1};
0038 static spinlock_t indirect_lock[MAXDEV];
0039
0040 module_param_hw_array(port, ulong, ioport, NULL, 0444);
0041 MODULE_PARM_DESC(port, "I/O port number");
0042
0043 module_param_hw_array(mem, ulong, iomem, NULL, 0444);
0044 MODULE_PARM_DESC(mem, "I/O memory address");
0045
0046 module_param_hw_array(indirect, int, ioport, NULL, 0444);
0047 MODULE_PARM_DESC(indirect, "Indirect access via address and data port");
0048
0049 module_param_hw_array(irq, int, irq, NULL, 0444);
0050 MODULE_PARM_DESC(irq, "IRQ number");
0051
0052 module_param_array(clk, int, NULL, 0444);
0053 MODULE_PARM_DESC(clk, "External oscillator clock frequency "
0054 "(default=16000000 [16 MHz])");
0055
0056 module_param_array(cdr, byte, NULL, 0444);
0057 MODULE_PARM_DESC(cdr, "Clock divider register "
0058 "(default=0x48 [CDR_CBP | CDR_CLK_OFF])");
0059
0060 module_param_array(ocr, byte, NULL, 0444);
0061 MODULE_PARM_DESC(ocr, "Output control register "
0062 "(default=0x18 [OCR_TX0_PUSHPULL])");
0063
0064 #define SJA1000_IOSIZE 0x20
0065 #define SJA1000_IOSIZE_INDIRECT 0x02
0066
0067 static struct platform_device *sja1000_isa_devs[MAXDEV];
0068
0069 static u8 sja1000_isa_mem_read_reg(const struct sja1000_priv *priv, int reg)
0070 {
0071 return readb(priv->reg_base + reg);
0072 }
0073
0074 static void sja1000_isa_mem_write_reg(const struct sja1000_priv *priv,
0075 int reg, u8 val)
0076 {
0077 writeb(val, priv->reg_base + reg);
0078 }
0079
0080 static u8 sja1000_isa_port_read_reg(const struct sja1000_priv *priv, int reg)
0081 {
0082 return inb((unsigned long)priv->reg_base + reg);
0083 }
0084
0085 static void sja1000_isa_port_write_reg(const struct sja1000_priv *priv,
0086 int reg, u8 val)
0087 {
0088 outb(val, (unsigned long)priv->reg_base + reg);
0089 }
0090
0091 static u8 sja1000_isa_port_read_reg_indirect(const struct sja1000_priv *priv,
0092 int reg)
0093 {
0094 unsigned long flags, base = (unsigned long)priv->reg_base;
0095 u8 readval;
0096
0097 spin_lock_irqsave(&indirect_lock[priv->dev->dev_id], flags);
0098 outb(reg, base);
0099 readval = inb(base + 1);
0100 spin_unlock_irqrestore(&indirect_lock[priv->dev->dev_id], flags);
0101
0102 return readval;
0103 }
0104
0105 static void sja1000_isa_port_write_reg_indirect(const struct sja1000_priv *priv,
0106 int reg, u8 val)
0107 {
0108 unsigned long flags, base = (unsigned long)priv->reg_base;
0109
0110 spin_lock_irqsave(&indirect_lock[priv->dev->dev_id], flags);
0111 outb(reg, base);
0112 outb(val, base + 1);
0113 spin_unlock_irqrestore(&indirect_lock[priv->dev->dev_id], flags);
0114 }
0115
0116 static int sja1000_isa_probe(struct platform_device *pdev)
0117 {
0118 struct net_device *dev;
0119 struct sja1000_priv *priv;
0120 void __iomem *base = NULL;
0121 int iosize = SJA1000_IOSIZE;
0122 int idx = pdev->id;
0123 int err;
0124
0125 dev_dbg(&pdev->dev, "probing idx=%d: port=%#lx, mem=%#lx, irq=%d\n",
0126 idx, port[idx], mem[idx], irq[idx]);
0127
0128 if (mem[idx]) {
0129 if (!request_mem_region(mem[idx], iosize, DRV_NAME)) {
0130 err = -EBUSY;
0131 goto exit;
0132 }
0133 base = ioremap(mem[idx], iosize);
0134 if (!base) {
0135 err = -ENOMEM;
0136 goto exit_release;
0137 }
0138 } else {
0139 if (indirect[idx] > 0 ||
0140 (indirect[idx] == -1 && indirect[0] > 0))
0141 iosize = SJA1000_IOSIZE_INDIRECT;
0142 if (!request_region(port[idx], iosize, DRV_NAME)) {
0143 err = -EBUSY;
0144 goto exit;
0145 }
0146 }
0147
0148 dev = alloc_sja1000dev(0);
0149 if (!dev) {
0150 err = -ENOMEM;
0151 goto exit_unmap;
0152 }
0153 priv = netdev_priv(dev);
0154
0155 dev->irq = irq[idx];
0156 priv->irq_flags = IRQF_SHARED;
0157 if (mem[idx]) {
0158 priv->reg_base = base;
0159 dev->base_addr = mem[idx];
0160 priv->read_reg = sja1000_isa_mem_read_reg;
0161 priv->write_reg = sja1000_isa_mem_write_reg;
0162 } else {
0163 priv->reg_base = (void __iomem *)port[idx];
0164 dev->base_addr = port[idx];
0165
0166 if (iosize == SJA1000_IOSIZE_INDIRECT) {
0167 priv->read_reg = sja1000_isa_port_read_reg_indirect;
0168 priv->write_reg = sja1000_isa_port_write_reg_indirect;
0169 spin_lock_init(&indirect_lock[idx]);
0170 } else {
0171 priv->read_reg = sja1000_isa_port_read_reg;
0172 priv->write_reg = sja1000_isa_port_write_reg;
0173 }
0174 }
0175
0176 if (clk[idx])
0177 priv->can.clock.freq = clk[idx] / 2;
0178 else if (clk[0])
0179 priv->can.clock.freq = clk[0] / 2;
0180 else
0181 priv->can.clock.freq = CLK_DEFAULT / 2;
0182
0183 if (ocr[idx] != 0xff)
0184 priv->ocr = ocr[idx];
0185 else if (ocr[0] != 0xff)
0186 priv->ocr = ocr[0];
0187 else
0188 priv->ocr = OCR_DEFAULT;
0189
0190 if (cdr[idx] != 0xff)
0191 priv->cdr = cdr[idx];
0192 else if (cdr[0] != 0xff)
0193 priv->cdr = cdr[0];
0194 else
0195 priv->cdr = CDR_DEFAULT;
0196
0197 platform_set_drvdata(pdev, dev);
0198 SET_NETDEV_DEV(dev, &pdev->dev);
0199 dev->dev_id = idx;
0200
0201 err = register_sja1000dev(dev);
0202 if (err) {
0203 dev_err(&pdev->dev, "registering %s failed (err=%d)\n",
0204 DRV_NAME, err);
0205 goto exit_unmap;
0206 }
0207
0208 dev_info(&pdev->dev, "%s device registered (reg_base=0x%p, irq=%d)\n",
0209 DRV_NAME, priv->reg_base, dev->irq);
0210 return 0;
0211
0212 exit_unmap:
0213 if (mem[idx])
0214 iounmap(base);
0215 exit_release:
0216 if (mem[idx])
0217 release_mem_region(mem[idx], iosize);
0218 else
0219 release_region(port[idx], iosize);
0220 exit:
0221 return err;
0222 }
0223
0224 static int sja1000_isa_remove(struct platform_device *pdev)
0225 {
0226 struct net_device *dev = platform_get_drvdata(pdev);
0227 struct sja1000_priv *priv = netdev_priv(dev);
0228 int idx = pdev->id;
0229
0230 unregister_sja1000dev(dev);
0231
0232 if (mem[idx]) {
0233 iounmap(priv->reg_base);
0234 release_mem_region(mem[idx], SJA1000_IOSIZE);
0235 } else {
0236 if (priv->read_reg == sja1000_isa_port_read_reg_indirect)
0237 release_region(port[idx], SJA1000_IOSIZE_INDIRECT);
0238 else
0239 release_region(port[idx], SJA1000_IOSIZE);
0240 }
0241 free_sja1000dev(dev);
0242
0243 return 0;
0244 }
0245
0246 static struct platform_driver sja1000_isa_driver = {
0247 .probe = sja1000_isa_probe,
0248 .remove = sja1000_isa_remove,
0249 .driver = {
0250 .name = DRV_NAME,
0251 },
0252 };
0253
0254 static int __init sja1000_isa_init(void)
0255 {
0256 int idx, err;
0257
0258 for (idx = 0; idx < MAXDEV; idx++) {
0259 if ((port[idx] || mem[idx]) && irq[idx]) {
0260 sja1000_isa_devs[idx] =
0261 platform_device_alloc(DRV_NAME, idx);
0262 if (!sja1000_isa_devs[idx]) {
0263 err = -ENOMEM;
0264 goto exit_free_devices;
0265 }
0266 err = platform_device_add(sja1000_isa_devs[idx]);
0267 if (err) {
0268 platform_device_put(sja1000_isa_devs[idx]);
0269 goto exit_free_devices;
0270 }
0271 pr_debug("%s: platform device %d: port=%#lx, mem=%#lx, "
0272 "irq=%d\n",
0273 DRV_NAME, idx, port[idx], mem[idx], irq[idx]);
0274 } else if (idx == 0 || port[idx] || mem[idx]) {
0275 pr_err("%s: insufficient parameters supplied\n",
0276 DRV_NAME);
0277 err = -EINVAL;
0278 goto exit_free_devices;
0279 }
0280 }
0281
0282 err = platform_driver_register(&sja1000_isa_driver);
0283 if (err)
0284 goto exit_free_devices;
0285
0286 pr_info("Legacy %s driver for max. %d devices registered\n",
0287 DRV_NAME, MAXDEV);
0288
0289 return 0;
0290
0291 exit_free_devices:
0292 while (--idx >= 0) {
0293 if (sja1000_isa_devs[idx])
0294 platform_device_unregister(sja1000_isa_devs[idx]);
0295 }
0296
0297 return err;
0298 }
0299
0300 static void __exit sja1000_isa_exit(void)
0301 {
0302 int idx;
0303
0304 platform_driver_unregister(&sja1000_isa_driver);
0305 for (idx = 0; idx < MAXDEV; idx++) {
0306 if (sja1000_isa_devs[idx])
0307 platform_device_unregister(sja1000_isa_devs[idx]);
0308 }
0309 }
0310
0311 module_init(sja1000_isa_init);
0312 module_exit(sja1000_isa_exit);
