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-rw-r--r--windhoek/ide/ide.c554
1 files changed, 554 insertions, 0 deletions
diff --git a/windhoek/ide/ide.c b/windhoek/ide/ide.c
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+++ b/windhoek/ide/ide.c
@@ -0,0 +1,554 @@
+/*
+ * Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
+ * Copyright (C) 2003-2005, 2007 Bartlomiej Zolnierkiewicz
+ */
+
+/*
+ * Mostly written by Mark Lord <mlord@pobox.com>
+ * and Gadi Oxman <gadio@netvision.net.il>
+ * and Andre Hedrick <andre@linux-ide.org>
+ *
+ * See linux/MAINTAINERS for address of current maintainer.
+ *
+ * This is the multiple IDE interface driver, as evolved from hd.c.
+ * It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
+ * (usually 14 & 15).
+ * There can be up to two drives per interface, as per the ATA-2 spec.
+ *
+ * ...
+ *
+ * From hd.c:
+ * |
+ * | It traverses the request-list, using interrupts to jump between functions.
+ * | As nearly all functions can be called within interrupts, we may not sleep.
+ * | Special care is recommended. Have Fun!
+ * |
+ * | modified by Drew Eckhardt to check nr of hd's from the CMOS.
+ * |
+ * | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
+ * | in the early extended-partition checks and added DM partitions.
+ * |
+ * | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
+ * |
+ * | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
+ * | and general streamlining by Mark Lord (mlord@pobox.com).
+ *
+ * October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
+ *
+ * Mark Lord (mlord@pobox.com) (IDE Perf.Pkg)
+ * Delman Lee (delman@ieee.org) ("Mr. atdisk2")
+ * Scott Snyder (snyder@fnald0.fnal.gov) (ATAPI IDE cd-rom)
+ *
+ * This was a rewrite of just about everything from hd.c, though some original
+ * code is still sprinkled about. Think of it as a major evolution, with
+ * inspiration from lots of linux users, esp. hamish@zot.apana.org.au
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/major.h>
+#include <linux/errno.h>
+#include <linux/genhd.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/ide.h>
+#include <linux/hdreg.h>
+#include <linux/completion.h>
+#include <linux/device.h>
+
+struct class *ide_port_class;
+
+/*
+ * Locks for IDE setting functionality
+ */
+
+DEFINE_MUTEX(ide_setting_mtx);
+
+ide_devset_get(io_32bit, io_32bit);
+
+static int set_io_32bit(ide_drive_t *drive, int arg)
+{
+ if (drive->dev_flags & IDE_DFLAG_NO_IO_32BIT)
+ return -EPERM;
+
+ if (arg < 0 || arg > 1 + (SUPPORT_VLB_SYNC << 1))
+ return -EINVAL;
+
+ drive->io_32bit = arg;
+
+ return 0;
+}
+
+ide_devset_get_flag(ksettings, IDE_DFLAG_KEEP_SETTINGS);
+
+static int set_ksettings(ide_drive_t *drive, int arg)
+{
+ if (arg < 0 || arg > 1)
+ return -EINVAL;
+
+ if (arg)
+ drive->dev_flags |= IDE_DFLAG_KEEP_SETTINGS;
+ else
+ drive->dev_flags &= ~IDE_DFLAG_KEEP_SETTINGS;
+
+ return 0;
+}
+
+ide_devset_get_flag(using_dma, IDE_DFLAG_USING_DMA);
+
+static int set_using_dma(ide_drive_t *drive, int arg)
+{
+#ifdef CONFIG_BLK_DEV_IDEDMA
+ int err = -EPERM;
+
+ if (arg < 0 || arg > 1)
+ return -EINVAL;
+
+ if (ata_id_has_dma(drive->id) == 0)
+ goto out;
+
+ if (drive->hwif->dma_ops == NULL)
+ goto out;
+
+ err = 0;
+
+ if (arg) {
+ if (ide_set_dma(drive))
+ err = -EIO;
+ } else
+ ide_dma_off(drive);
+
+out:
+ return err;
+#else
+ if (arg < 0 || arg > 1)
+ return -EINVAL;
+
+ return -EPERM;
+#endif
+}
+
+/*
+ * handle HDIO_SET_PIO_MODE ioctl abusers here, eventually it will go away
+ */
+static int set_pio_mode_abuse(ide_hwif_t *hwif, u8 req_pio)
+{
+ switch (req_pio) {
+ case 202:
+ case 201:
+ case 200:
+ case 102:
+ case 101:
+ case 100:
+ return (hwif->host_flags & IDE_HFLAG_ABUSE_DMA_MODES) ? 1 : 0;
+ case 9:
+ case 8:
+ return (hwif->host_flags & IDE_HFLAG_ABUSE_PREFETCH) ? 1 : 0;
+ case 7:
+ case 6:
+ return (hwif->host_flags & IDE_HFLAG_ABUSE_FAST_DEVSEL) ? 1 : 0;
+ default:
+ return 0;
+ }
+}
+
+static int set_pio_mode(ide_drive_t *drive, int arg)
+{
+ ide_hwif_t *hwif = drive->hwif;
+ const struct ide_port_ops *port_ops = hwif->port_ops;
+
+ if (arg < 0 || arg > 255)
+ return -EINVAL;
+
+ if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
+ (hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
+ return -ENOSYS;
+
+ if (set_pio_mode_abuse(drive->hwif, arg)) {
+ if (arg == 8 || arg == 9) {
+ unsigned long flags;
+
+ /* take lock for IDE_DFLAG_[NO_]UNMASK/[NO_]IO_32BIT */
+ spin_lock_irqsave(&hwif->lock, flags);
+ port_ops->set_pio_mode(drive, arg);
+ spin_unlock_irqrestore(&hwif->lock, flags);
+ } else
+ port_ops->set_pio_mode(drive, arg);
+ } else {
+ int keep_dma = !!(drive->dev_flags & IDE_DFLAG_USING_DMA);
+
+ ide_set_pio(drive, arg);
+
+ if (hwif->host_flags & IDE_HFLAG_SET_PIO_MODE_KEEP_DMA) {
+ if (keep_dma)
+ ide_dma_on(drive);
+ }
+ }
+
+ return 0;
+}
+
+ide_devset_get_flag(unmaskirq, IDE_DFLAG_UNMASK);
+
+static int set_unmaskirq(ide_drive_t *drive, int arg)
+{
+ if (drive->dev_flags & IDE_DFLAG_NO_UNMASK)
+ return -EPERM;
+
+ if (arg < 0 || arg > 1)
+ return -EINVAL;
+
+ if (arg)
+ drive->dev_flags |= IDE_DFLAG_UNMASK;
+ else
+ drive->dev_flags &= ~IDE_DFLAG_UNMASK;
+
+ return 0;
+}
+
+ide_ext_devset_rw_sync(io_32bit, io_32bit);
+ide_ext_devset_rw_sync(keepsettings, ksettings);
+ide_ext_devset_rw_sync(unmaskirq, unmaskirq);
+ide_ext_devset_rw_sync(using_dma, using_dma);
+__IDE_DEVSET(pio_mode, DS_SYNC, NULL, set_pio_mode);
+
+/**
+ * ide_device_get - get an additional reference to a ide_drive_t
+ * @drive: device to get a reference to
+ *
+ * Gets a reference to the ide_drive_t and increments the use count of the
+ * underlying LLDD module.
+ */
+int ide_device_get(ide_drive_t *drive)
+{
+ struct device *host_dev;
+ struct module *module;
+
+ if (!get_device(&drive->gendev))
+ return -ENXIO;
+
+ host_dev = drive->hwif->host->dev[0];
+ module = host_dev ? host_dev->driver->owner : NULL;
+
+ if (module && !try_module_get(module)) {
+ put_device(&drive->gendev);
+ return -ENXIO;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ide_device_get);
+
+/**
+ * ide_device_put - release a reference to a ide_drive_t
+ * @drive: device to release a reference on
+ *
+ * Release a reference to the ide_drive_t and decrements the use count of
+ * the underlying LLDD module.
+ */
+void ide_device_put(ide_drive_t *drive)
+{
+#ifdef CONFIG_MODULE_UNLOAD
+ struct device *host_dev = drive->hwif->host->dev[0];
+ struct module *module = host_dev ? host_dev->driver->owner : NULL;
+
+ if (module)
+ module_put(module);
+#endif
+ put_device(&drive->gendev);
+}
+EXPORT_SYMBOL_GPL(ide_device_put);
+
+static int ide_bus_match(struct device *dev, struct device_driver *drv)
+{
+ return 1;
+}
+
+static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ ide_drive_t *drive = to_ide_device(dev);
+
+ add_uevent_var(env, "MEDIA=%s", ide_media_string(drive));
+ add_uevent_var(env, "DRIVENAME=%s", drive->name);
+ add_uevent_var(env, "MODALIAS=ide:m-%s", ide_media_string(drive));
+ return 0;
+}
+
+static int generic_ide_probe(struct device *dev)
+{
+ ide_drive_t *drive = to_ide_device(dev);
+ struct ide_driver *drv = to_ide_driver(dev->driver);
+
+ return drv->probe ? drv->probe(drive) : -ENODEV;
+}
+
+static int generic_ide_remove(struct device *dev)
+{
+ ide_drive_t *drive = to_ide_device(dev);
+ struct ide_driver *drv = to_ide_driver(dev->driver);
+
+ if (drv->remove)
+ drv->remove(drive);
+
+ return 0;
+}
+
+static void generic_ide_shutdown(struct device *dev)
+{
+ ide_drive_t *drive = to_ide_device(dev);
+ struct ide_driver *drv = to_ide_driver(dev->driver);
+
+ if (dev->driver && drv->shutdown)
+ drv->shutdown(drive);
+}
+
+struct bus_type ide_bus_type = {
+ .name = "ide",
+ .match = ide_bus_match,
+ .uevent = ide_uevent,
+ .probe = generic_ide_probe,
+ .remove = generic_ide_remove,
+ .shutdown = generic_ide_shutdown,
+ .dev_attrs = ide_dev_attrs,
+#ifndef DDE_LINUX
+ .suspend = generic_ide_suspend,
+ .resume = generic_ide_resume,
+#endif
+};
+
+EXPORT_SYMBOL_GPL(ide_bus_type);
+
+int ide_vlb_clk;
+EXPORT_SYMBOL_GPL(ide_vlb_clk);
+
+module_param_named(vlb_clock, ide_vlb_clk, int, 0);
+MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
+
+int ide_pci_clk;
+EXPORT_SYMBOL_GPL(ide_pci_clk);
+
+module_param_named(pci_clock, ide_pci_clk, int, 0);
+MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
+
+static int ide_set_dev_param_mask(const char *s, struct kernel_param *kp)
+{
+ int a, b, i, j = 1;
+ unsigned int *dev_param_mask = (unsigned int *)kp->arg;
+
+ /* controller . device (0 or 1) [ : 1 (set) | 0 (clear) ] */
+ if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
+ sscanf(s, "%d.%d", &a, &b) != 2)
+ return -EINVAL;
+
+ i = a * MAX_DRIVES + b;
+
+ if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
+ return -EINVAL;
+
+ if (j)
+ *dev_param_mask |= (1 << i);
+ else
+ *dev_param_mask &= ~(1 << i);
+
+ return 0;
+}
+
+static unsigned int ide_nodma;
+
+module_param_call(nodma, ide_set_dev_param_mask, NULL, &ide_nodma, 0);
+MODULE_PARM_DESC(nodma, "disallow DMA for a device");
+
+static unsigned int ide_noflush;
+
+module_param_call(noflush, ide_set_dev_param_mask, NULL, &ide_noflush, 0);
+MODULE_PARM_DESC(noflush, "disable flush requests for a device");
+
+static unsigned int ide_noprobe;
+
+module_param_call(noprobe, ide_set_dev_param_mask, NULL, &ide_noprobe, 0);
+MODULE_PARM_DESC(noprobe, "skip probing for a device");
+
+static unsigned int ide_nowerr;
+
+module_param_call(nowerr, ide_set_dev_param_mask, NULL, &ide_nowerr, 0);
+MODULE_PARM_DESC(nowerr, "ignore the ATA_DF bit for a device");
+
+static unsigned int ide_cdroms;
+
+module_param_call(cdrom, ide_set_dev_param_mask, NULL, &ide_cdroms, 0);
+MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
+
+struct chs_geom {
+ unsigned int cyl;
+ u8 head;
+ u8 sect;
+};
+
+static unsigned int ide_disks;
+static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
+
+static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
+{
+ int a, b, c = 0, h = 0, s = 0, i, j = 1;
+
+ /* controller . device (0 or 1) : Cylinders , Heads , Sectors */
+ /* controller . device (0 or 1) : 1 (use CHS) | 0 (ignore CHS) */
+ if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
+ sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
+ return -EINVAL;
+
+ i = a * MAX_DRIVES + b;
+
+ if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
+ return -EINVAL;
+
+ if (c > INT_MAX || h > 255 || s > 255)
+ return -EINVAL;
+
+ if (j)
+ ide_disks |= (1 << i);
+ else
+ ide_disks &= ~(1 << i);
+
+ ide_disks_chs[i].cyl = c;
+ ide_disks_chs[i].head = h;
+ ide_disks_chs[i].sect = s;
+
+ return 0;
+}
+
+module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
+MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
+
+static void ide_dev_apply_params(ide_drive_t *drive, u8 unit)
+{
+ int i = drive->hwif->index * MAX_DRIVES + unit;
+
+ if (ide_nodma & (1 << i)) {
+ printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
+ drive->dev_flags |= IDE_DFLAG_NODMA;
+ }
+ if (ide_noflush & (1 << i)) {
+ printk(KERN_INFO "ide: disabling flush requests for %s\n",
+ drive->name);
+ drive->dev_flags |= IDE_DFLAG_NOFLUSH;
+ }
+ if (ide_noprobe & (1 << i)) {
+ printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
+ drive->dev_flags |= IDE_DFLAG_NOPROBE;
+ }
+ if (ide_nowerr & (1 << i)) {
+ printk(KERN_INFO "ide: ignoring the ATA_DF bit for %s\n",
+ drive->name);
+ drive->bad_wstat = BAD_R_STAT;
+ }
+ if (ide_cdroms & (1 << i)) {
+ printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
+ drive->dev_flags |= IDE_DFLAG_PRESENT;
+ drive->media = ide_cdrom;
+ /* an ATAPI device ignores DRDY */
+ drive->ready_stat = 0;
+ }
+ if (ide_disks & (1 << i)) {
+ drive->cyl = drive->bios_cyl = ide_disks_chs[i].cyl;
+ drive->head = drive->bios_head = ide_disks_chs[i].head;
+ drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
+
+ printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
+ drive->name,
+ drive->cyl, drive->head, drive->sect);
+
+ drive->dev_flags |= IDE_DFLAG_FORCED_GEOM | IDE_DFLAG_PRESENT;
+ drive->media = ide_disk;
+ drive->ready_stat = ATA_DRDY;
+ }
+}
+
+static unsigned int ide_ignore_cable;
+
+static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
+{
+ int i, j = 1;
+
+ /* controller (ignore) */
+ /* controller : 1 (ignore) | 0 (use) */
+ if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
+ return -EINVAL;
+
+ if (i >= MAX_HWIFS || j < 0 || j > 1)
+ return -EINVAL;
+
+ if (j)
+ ide_ignore_cable |= (1 << i);
+ else
+ ide_ignore_cable &= ~(1 << i);
+
+ return 0;
+}
+
+module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
+MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
+
+void ide_port_apply_params(ide_hwif_t *hwif)
+{
+ ide_drive_t *drive;
+ int i;
+
+ if (ide_ignore_cable & (1 << hwif->index)) {
+ printk(KERN_INFO "ide: ignoring cable detection for %s\n",
+ hwif->name);
+ hwif->cbl = ATA_CBL_PATA40_SHORT;
+ }
+
+ ide_port_for_each_dev(i, drive, hwif)
+ ide_dev_apply_params(drive, i);
+}
+
+/*
+ * This is gets invoked once during initialization, to set *everything* up
+ */
+static int __init ide_init(void)
+{
+ int ret;
+
+ printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
+
+ ret = bus_register(&ide_bus_type);
+ if (ret < 0) {
+ printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
+ return ret;
+ }
+
+ ide_port_class = class_create(THIS_MODULE, "ide_port");
+ if (IS_ERR(ide_port_class)) {
+ ret = PTR_ERR(ide_port_class);
+ goto out_port_class;
+ }
+
+ proc_ide_create();
+
+ return 0;
+
+out_port_class:
+ bus_unregister(&ide_bus_type);
+
+ return ret;
+}
+
+static void __exit ide_exit(void)
+{
+ proc_ide_destroy();
+
+ class_destroy(ide_port_class);
+
+ bus_unregister(&ide_bus_type);
+}
+
+module_init(ide_init);
+module_exit(ide_exit);
+
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.46.0) at 2025-04-30 01:43:12 +0000