154 lines
3.1 KiB
C
154 lines
3.1 KiB
C
/*
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* generic/default IDE host driver
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*
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* Copyright (C) 2004, 2008 Bartlomiej Zolnierkiewicz
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* This code was split off from ide.c. See it for original copyrights.
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*
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* May be copied or modified under the terms of the GNU General Public License.
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*/
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/*
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* For special cases new interfaces may be added using sysfs, i.e.
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*
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* echo -n "0x168:0x36e:10" > /sys/class/ide_generic/add
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*
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* will add an interface using I/O ports 0x168-0x16f/0x36e and IRQ 10.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/ide.h>
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#define DRV_NAME "ide_generic"
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static int probe_mask = 0x03;
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module_param(probe_mask, int, 0);
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MODULE_PARM_DESC(probe_mask, "probe mask for legacy ISA IDE ports");
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static ssize_t store_add(struct class *cls, const char *buf, size_t n)
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{
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ide_hwif_t *hwif;
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unsigned int base, ctl;
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int irq;
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hw_regs_t hw;
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u8 idx[] = { 0xff, 0xff, 0xff, 0xff };
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if (sscanf(buf, "%x:%x:%d", &base, &ctl, &irq) != 3)
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return -EINVAL;
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hwif = ide_find_port();
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if (hwif == NULL)
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return -ENOENT;
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memset(&hw, 0, sizeof(hw));
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ide_std_init_ports(&hw, base, ctl);
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hw.irq = irq;
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hw.chipset = ide_generic;
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ide_init_port_hw(hwif, &hw);
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idx[0] = hwif->index;
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ide_device_add(idx, NULL);
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return n;
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};
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static struct class_attribute ide_generic_class_attrs[] = {
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__ATTR(add, S_IWUSR, NULL, store_add),
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__ATTR_NULL
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};
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static void ide_generic_class_release(struct class *cls)
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{
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kfree(cls);
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}
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static int __init ide_generic_sysfs_init(void)
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{
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struct class *cls;
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int rc;
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cls = kzalloc(sizeof(*cls), GFP_KERNEL);
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if (!cls)
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return -ENOMEM;
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cls->name = DRV_NAME;
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cls->owner = THIS_MODULE;
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cls->class_release = ide_generic_class_release;
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cls->class_attrs = ide_generic_class_attrs;
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rc = class_register(cls);
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if (rc) {
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kfree(cls);
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return rc;
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}
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return 0;
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}
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static int __init ide_generic_init(void)
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{
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u8 idx[MAX_HWIFS];
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int i;
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printk(KERN_INFO DRV_NAME ": please use \"probe_mask=0x3f\" module "
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"parameter for probing all legacy ISA IDE ports\n");
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for (i = 0; i < MAX_HWIFS; i++) {
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ide_hwif_t *hwif;
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unsigned long io_addr = ide_default_io_base(i);
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hw_regs_t hw;
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idx[i] = 0xff;
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if ((probe_mask & (1 << i)) && io_addr) {
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if (!request_region(io_addr, 8, DRV_NAME)) {
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printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX "
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"not free.\n",
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DRV_NAME, io_addr, io_addr + 7);
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continue;
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}
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if (!request_region(io_addr + 0x206, 1, DRV_NAME)) {
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printk(KERN_ERR "%s: I/O resource 0x%lX "
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"not free.\n",
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DRV_NAME, io_addr + 0x206);
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release_region(io_addr, 8);
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continue;
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}
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/*
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* Skip probing if the corresponding
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* slot is already occupied.
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*/
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hwif = ide_find_port();
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if (hwif == NULL || hwif->index != i) {
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idx[i] = 0xff;
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continue;
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}
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memset(&hw, 0, sizeof(hw));
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ide_std_init_ports(&hw, io_addr, io_addr + 0x206);
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hw.irq = ide_default_irq(io_addr);
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hw.chipset = ide_generic;
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ide_init_port_hw(hwif, &hw);
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idx[i] = i;
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}
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}
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ide_device_add_all(idx, NULL);
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if (ide_generic_sysfs_init())
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printk(KERN_ERR DRV_NAME ": failed to create ide_generic "
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"class\n");
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return 0;
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}
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module_init(ide_generic_init);
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MODULE_LICENSE("GPL");
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