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![Rusty Russell](/assets/img/avatar_default.png)
It has the additional benefit of typechecking (in this case, an unsigned int). Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Reviewed-by: Takashi Iwai <tiwai@suse.de>
415 lines
10 KiB
C
415 lines
10 KiB
C
/*
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* Copyright (C) 1994-1998 Linus Torvalds & authors (see below)
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* Copyright (C) 2003-2005, 2007 Bartlomiej Zolnierkiewicz
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*/
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/*
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* Mostly written by Mark Lord <mlord@pobox.com>
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* and Gadi Oxman <gadio@netvision.net.il>
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* and Andre Hedrick <andre@linux-ide.org>
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*
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* See linux/MAINTAINERS for address of current maintainer.
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*
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* This is the multiple IDE interface driver, as evolved from hd.c.
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* It supports up to MAX_HWIFS IDE interfaces, on one or more IRQs
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* (usually 14 & 15).
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* There can be up to two drives per interface, as per the ATA-2 spec.
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*
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* ...
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*
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* From hd.c:
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* |
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* | It traverses the request-list, using interrupts to jump between functions.
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* | As nearly all functions can be called within interrupts, we may not sleep.
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* | Special care is recommended. Have Fun!
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* |
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* | modified by Drew Eckhardt to check nr of hd's from the CMOS.
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* |
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* | Thanks to Branko Lankester, lankeste@fwi.uva.nl, who found a bug
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* | in the early extended-partition checks and added DM partitions.
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* |
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* | Early work on error handling by Mika Liljeberg (liljeber@cs.Helsinki.FI).
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* |
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* | IRQ-unmask, drive-id, multiple-mode, support for ">16 heads",
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* | and general streamlining by Mark Lord (mlord@pobox.com).
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*
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* October, 1994 -- Complete line-by-line overhaul for linux 1.1.x, by:
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*
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* Mark Lord (mlord@pobox.com) (IDE Perf.Pkg)
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* Delman Lee (delman@ieee.org) ("Mr. atdisk2")
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* Scott Snyder (snyder@fnald0.fnal.gov) (ATAPI IDE cd-rom)
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*
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* This was a rewrite of just about everything from hd.c, though some original
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* code is still sprinkled about. Think of it as a major evolution, with
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* inspiration from lots of linux users, esp. hamish@zot.apana.org.au
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/major.h>
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#include <linux/errno.h>
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#include <linux/genhd.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/ide.h>
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#include <linux/hdreg.h>
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#include <linux/completion.h>
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#include <linux/device.h>
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struct class *ide_port_class;
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/**
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* ide_device_get - get an additional reference to a ide_drive_t
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* @drive: device to get a reference to
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*
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* Gets a reference to the ide_drive_t and increments the use count of the
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* underlying LLDD module.
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*/
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int ide_device_get(ide_drive_t *drive)
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{
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struct device *host_dev;
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struct module *module;
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if (!get_device(&drive->gendev))
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return -ENXIO;
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host_dev = drive->hwif->host->dev[0];
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module = host_dev ? host_dev->driver->owner : NULL;
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if (module && !try_module_get(module)) {
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put_device(&drive->gendev);
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return -ENXIO;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(ide_device_get);
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/**
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* ide_device_put - release a reference to a ide_drive_t
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* @drive: device to release a reference on
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*
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* Release a reference to the ide_drive_t and decrements the use count of
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* the underlying LLDD module.
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*/
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void ide_device_put(ide_drive_t *drive)
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{
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#ifdef CONFIG_MODULE_UNLOAD
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struct device *host_dev = drive->hwif->host->dev[0];
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struct module *module = host_dev ? host_dev->driver->owner : NULL;
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if (module)
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module_put(module);
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#endif
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put_device(&drive->gendev);
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}
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EXPORT_SYMBOL_GPL(ide_device_put);
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static int ide_bus_match(struct device *dev, struct device_driver *drv)
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{
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return 1;
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}
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static int ide_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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ide_drive_t *drive = to_ide_device(dev);
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add_uevent_var(env, "MEDIA=%s", ide_media_string(drive));
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add_uevent_var(env, "DRIVENAME=%s", drive->name);
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add_uevent_var(env, "MODALIAS=ide:m-%s", ide_media_string(drive));
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return 0;
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}
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static int generic_ide_probe(struct device *dev)
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{
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ide_drive_t *drive = to_ide_device(dev);
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struct ide_driver *drv = to_ide_driver(dev->driver);
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return drv->probe ? drv->probe(drive) : -ENODEV;
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}
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static int generic_ide_remove(struct device *dev)
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{
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ide_drive_t *drive = to_ide_device(dev);
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struct ide_driver *drv = to_ide_driver(dev->driver);
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if (drv->remove)
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drv->remove(drive);
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return 0;
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}
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static void generic_ide_shutdown(struct device *dev)
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{
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ide_drive_t *drive = to_ide_device(dev);
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struct ide_driver *drv = to_ide_driver(dev->driver);
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if (dev->driver && drv->shutdown)
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drv->shutdown(drive);
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}
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struct bus_type ide_bus_type = {
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.name = "ide",
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.match = ide_bus_match,
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.uevent = ide_uevent,
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.probe = generic_ide_probe,
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.remove = generic_ide_remove,
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.shutdown = generic_ide_shutdown,
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.dev_attrs = ide_dev_attrs,
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.suspend = generic_ide_suspend,
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.resume = generic_ide_resume,
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};
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EXPORT_SYMBOL_GPL(ide_bus_type);
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int ide_vlb_clk;
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EXPORT_SYMBOL_GPL(ide_vlb_clk);
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module_param_named(vlb_clock, ide_vlb_clk, int, 0);
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MODULE_PARM_DESC(vlb_clock, "VLB clock frequency (in MHz)");
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int ide_pci_clk;
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EXPORT_SYMBOL_GPL(ide_pci_clk);
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module_param_named(pci_clock, ide_pci_clk, int, 0);
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MODULE_PARM_DESC(pci_clock, "PCI bus clock frequency (in MHz)");
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static int ide_set_dev_param_mask(const char *s, const struct kernel_param *kp)
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{
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int a, b, i, j = 1;
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unsigned int *dev_param_mask = (unsigned int *)kp->arg;
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/* controller . device (0 or 1) [ : 1 (set) | 0 (clear) ] */
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if (sscanf(s, "%d.%d:%d", &a, &b, &j) != 3 &&
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sscanf(s, "%d.%d", &a, &b) != 2)
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return -EINVAL;
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i = a * MAX_DRIVES + b;
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if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
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return -EINVAL;
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if (j)
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*dev_param_mask |= (1 << i);
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else
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*dev_param_mask &= ~(1 << i);
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return 0;
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}
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static struct kernel_param_ops param_ops_ide_dev_mask = {
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.set = ide_set_dev_param_mask
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};
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#define param_check_ide_dev_mask(name, p) param_check_uint(name, p)
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static unsigned int ide_nodma;
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module_param_named(nodma, ide_nodma, ide_dev_mask, 0);
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MODULE_PARM_DESC(nodma, "disallow DMA for a device");
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static unsigned int ide_noflush;
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module_param_named(noflush, ide_noflush, ide_dev_mask, 0);
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MODULE_PARM_DESC(noflush, "disable flush requests for a device");
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static unsigned int ide_nohpa;
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module_param_named(nohpa, ide_nohpa, ide_dev_mask, 0);
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MODULE_PARM_DESC(nohpa, "disable Host Protected Area for a device");
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static unsigned int ide_noprobe;
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module_param_named(noprobe, ide_noprobe, ide_dev_mask, 0);
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MODULE_PARM_DESC(noprobe, "skip probing for a device");
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static unsigned int ide_nowerr;
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module_param_named(nowerr, ide_nowerr, ide_dev_mask, 0);
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MODULE_PARM_DESC(nowerr, "ignore the ATA_DF bit for a device");
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static unsigned int ide_cdroms;
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module_param_named(cdrom, ide_cdroms, ide_dev_mask, 0);
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MODULE_PARM_DESC(cdrom, "force device as a CD-ROM");
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struct chs_geom {
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unsigned int cyl;
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u8 head;
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u8 sect;
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};
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static unsigned int ide_disks;
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static struct chs_geom ide_disks_chs[MAX_HWIFS * MAX_DRIVES];
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static int ide_set_disk_chs(const char *str, struct kernel_param *kp)
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{
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int a, b, c = 0, h = 0, s = 0, i, j = 1;
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/* controller . device (0 or 1) : Cylinders , Heads , Sectors */
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/* controller . device (0 or 1) : 1 (use CHS) | 0 (ignore CHS) */
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if (sscanf(str, "%d.%d:%d,%d,%d", &a, &b, &c, &h, &s) != 5 &&
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sscanf(str, "%d.%d:%d", &a, &b, &j) != 3)
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return -EINVAL;
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i = a * MAX_DRIVES + b;
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if (i >= MAX_HWIFS * MAX_DRIVES || j < 0 || j > 1)
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return -EINVAL;
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if (c > INT_MAX || h > 255 || s > 255)
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return -EINVAL;
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if (j)
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ide_disks |= (1 << i);
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else
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ide_disks &= ~(1 << i);
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ide_disks_chs[i].cyl = c;
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ide_disks_chs[i].head = h;
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ide_disks_chs[i].sect = s;
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return 0;
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}
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module_param_call(chs, ide_set_disk_chs, NULL, NULL, 0);
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MODULE_PARM_DESC(chs, "force device as a disk (using CHS)");
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static void ide_dev_apply_params(ide_drive_t *drive, u8 unit)
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{
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int i = drive->hwif->index * MAX_DRIVES + unit;
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if (ide_nodma & (1 << i)) {
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printk(KERN_INFO "ide: disallowing DMA for %s\n", drive->name);
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drive->dev_flags |= IDE_DFLAG_NODMA;
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}
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if (ide_noflush & (1 << i)) {
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printk(KERN_INFO "ide: disabling flush requests for %s\n",
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drive->name);
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drive->dev_flags |= IDE_DFLAG_NOFLUSH;
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}
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if (ide_nohpa & (1 << i)) {
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printk(KERN_INFO "ide: disabling Host Protected Area for %s\n",
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drive->name);
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drive->dev_flags |= IDE_DFLAG_NOHPA;
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}
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if (ide_noprobe & (1 << i)) {
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printk(KERN_INFO "ide: skipping probe for %s\n", drive->name);
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drive->dev_flags |= IDE_DFLAG_NOPROBE;
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}
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if (ide_nowerr & (1 << i)) {
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printk(KERN_INFO "ide: ignoring the ATA_DF bit for %s\n",
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drive->name);
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drive->bad_wstat = BAD_R_STAT;
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}
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if (ide_cdroms & (1 << i)) {
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printk(KERN_INFO "ide: forcing %s as a CD-ROM\n", drive->name);
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drive->dev_flags |= IDE_DFLAG_PRESENT;
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drive->media = ide_cdrom;
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/* an ATAPI device ignores DRDY */
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drive->ready_stat = 0;
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}
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if (ide_disks & (1 << i)) {
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drive->cyl = drive->bios_cyl = ide_disks_chs[i].cyl;
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drive->head = drive->bios_head = ide_disks_chs[i].head;
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drive->sect = drive->bios_sect = ide_disks_chs[i].sect;
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printk(KERN_INFO "ide: forcing %s as a disk (%d/%d/%d)\n",
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drive->name,
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drive->cyl, drive->head, drive->sect);
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drive->dev_flags |= IDE_DFLAG_FORCED_GEOM | IDE_DFLAG_PRESENT;
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drive->media = ide_disk;
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drive->ready_stat = ATA_DRDY;
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}
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}
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static unsigned int ide_ignore_cable;
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static int ide_set_ignore_cable(const char *s, struct kernel_param *kp)
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{
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int i, j = 1;
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/* controller (ignore) */
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/* controller : 1 (ignore) | 0 (use) */
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if (sscanf(s, "%d:%d", &i, &j) != 2 && sscanf(s, "%d", &i) != 1)
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return -EINVAL;
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if (i >= MAX_HWIFS || j < 0 || j > 1)
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return -EINVAL;
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if (j)
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ide_ignore_cable |= (1 << i);
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else
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ide_ignore_cable &= ~(1 << i);
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return 0;
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}
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module_param_call(ignore_cable, ide_set_ignore_cable, NULL, NULL, 0);
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MODULE_PARM_DESC(ignore_cable, "ignore cable detection");
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void ide_port_apply_params(ide_hwif_t *hwif)
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{
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ide_drive_t *drive;
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int i;
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if (ide_ignore_cable & (1 << hwif->index)) {
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printk(KERN_INFO "ide: ignoring cable detection for %s\n",
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hwif->name);
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hwif->cbl = ATA_CBL_PATA40_SHORT;
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}
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ide_port_for_each_dev(i, drive, hwif)
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ide_dev_apply_params(drive, i);
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}
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/*
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* This is gets invoked once during initialization, to set *everything* up
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*/
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static int __init ide_init(void)
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{
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int ret;
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printk(KERN_INFO "Uniform Multi-Platform E-IDE driver\n");
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ret = bus_register(&ide_bus_type);
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if (ret < 0) {
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printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
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return ret;
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}
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ide_port_class = class_create(THIS_MODULE, "ide_port");
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if (IS_ERR(ide_port_class)) {
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ret = PTR_ERR(ide_port_class);
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goto out_port_class;
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}
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ide_acpi_init();
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proc_ide_create();
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return 0;
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out_port_class:
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bus_unregister(&ide_bus_type);
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return ret;
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}
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static void __exit ide_exit(void)
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{
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proc_ide_destroy();
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class_destroy(ide_port_class);
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bus_unregister(&ide_bus_type);
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}
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module_init(ide_init);
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module_exit(ide_exit);
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MODULE_LICENSE("GPL");
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