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![Tejun Heo](/assets/img/avatar_default.png)
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
482 lines
12 KiB
C
482 lines
12 KiB
C
/*
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* IEEE 1284.3 Parallel port daisy chain and multiplexor code
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*
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* Copyright (C) 1999, 2000 Tim Waugh <tim@cyberelk.demon.co.uk>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* ??-12-1998: Initial implementation.
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* 31-01-1999: Make port-cloning transparent.
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* 13-02-1999: Move DeviceID technique from parport_probe.
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* 13-03-1999: Get DeviceID from non-IEEE 1284.3 devices too.
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* 22-02-2000: Count devices that are actually detected.
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*
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* Any part of this program may be used in documents licensed under
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* the GNU Free Documentation License, Version 1.1 or any later version
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/parport.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <asm/current.h>
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#include <asm/uaccess.h>
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#undef DEBUG
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#ifdef DEBUG
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#define DPRINTK(stuff...) printk(stuff)
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#else
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#define DPRINTK(stuff...)
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#endif
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static struct daisydev {
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struct daisydev *next;
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struct parport *port;
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int daisy;
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int devnum;
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} *topology = NULL;
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static DEFINE_SPINLOCK(topology_lock);
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static int numdevs = 0;
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/* Forward-declaration of lower-level functions. */
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static int mux_present(struct parport *port);
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static int num_mux_ports(struct parport *port);
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static int select_port(struct parport *port);
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static int assign_addrs(struct parport *port);
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/* Add a device to the discovered topology. */
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static void add_dev(int devnum, struct parport *port, int daisy)
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{
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struct daisydev *newdev, **p;
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newdev = kmalloc(sizeof(struct daisydev), GFP_KERNEL);
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if (newdev) {
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newdev->port = port;
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newdev->daisy = daisy;
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newdev->devnum = devnum;
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spin_lock(&topology_lock);
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for (p = &topology; *p && (*p)->devnum<devnum; p = &(*p)->next)
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;
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newdev->next = *p;
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*p = newdev;
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spin_unlock(&topology_lock);
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}
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}
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/* Clone a parport (actually, make an alias). */
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static struct parport *clone_parport(struct parport *real, int muxport)
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{
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struct parport *extra = parport_register_port(real->base,
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real->irq,
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real->dma,
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real->ops);
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if (extra) {
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extra->portnum = real->portnum;
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extra->physport = real;
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extra->muxport = muxport;
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real->slaves[muxport-1] = extra;
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}
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return extra;
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}
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/* Discover the IEEE1284.3 topology on a port -- muxes and daisy chains.
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* Return value is number of devices actually detected. */
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int parport_daisy_init(struct parport *port)
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{
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int detected = 0;
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char *deviceid;
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static const char *th[] = { /*0*/"th", "st", "nd", "rd", "th" };
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int num_ports;
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int i;
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int last_try = 0;
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again:
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/* Because this is called before any other devices exist,
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* we don't have to claim exclusive access. */
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/* If mux present on normal port, need to create new
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* parports for each extra port. */
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if (port->muxport < 0 && mux_present(port) &&
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/* don't be fooled: a mux must have 2 or 4 ports. */
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((num_ports = num_mux_ports(port)) == 2 || num_ports == 4)) {
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/* Leave original as port zero. */
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port->muxport = 0;
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printk(KERN_INFO
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"%s: 1st (default) port of %d-way multiplexor\n",
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port->name, num_ports);
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for (i = 1; i < num_ports; i++) {
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/* Clone the port. */
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struct parport *extra = clone_parport(port, i);
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if (!extra) {
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if (signal_pending(current))
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break;
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schedule();
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continue;
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}
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printk(KERN_INFO
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"%s: %d%s port of %d-way multiplexor on %s\n",
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extra->name, i + 1, th[i + 1], num_ports,
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port->name);
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/* Analyse that port too. We won't recurse
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forever because of the 'port->muxport < 0'
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test above. */
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parport_daisy_init(extra);
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}
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}
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if (port->muxport >= 0)
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select_port(port);
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parport_daisy_deselect_all(port);
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detected += assign_addrs(port);
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/* Count the potential legacy device at the end. */
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add_dev(numdevs++, port, -1);
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/* Find out the legacy device's IEEE 1284 device ID. */
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deviceid = kmalloc(1024, GFP_KERNEL);
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if (deviceid) {
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if (parport_device_id(numdevs - 1, deviceid, 1024) > 2)
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detected++;
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kfree(deviceid);
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}
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if (!detected && !last_try) {
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/* No devices were detected. Perhaps they are in some
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funny state; let's try to reset them and see if
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they wake up. */
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parport_daisy_fini(port);
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parport_write_control(port, PARPORT_CONTROL_SELECT);
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udelay(50);
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parport_write_control(port,
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PARPORT_CONTROL_SELECT |
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PARPORT_CONTROL_INIT);
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udelay(50);
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last_try = 1;
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goto again;
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}
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return detected;
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}
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/* Forget about devices on a physical port. */
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void parport_daisy_fini(struct parport *port)
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{
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struct daisydev **p;
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spin_lock(&topology_lock);
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p = &topology;
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while (*p) {
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struct daisydev *dev = *p;
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if (dev->port != port) {
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p = &dev->next;
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continue;
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}
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*p = dev->next;
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kfree(dev);
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}
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/* Gaps in the numbering could be handled better. How should
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someone enumerate through all IEEE1284.3 devices in the
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topology?. */
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if (!topology) numdevs = 0;
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spin_unlock(&topology_lock);
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return;
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}
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/**
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* parport_open - find a device by canonical device number
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* @devnum: canonical device number
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* @name: name to associate with the device
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*
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* This function is similar to parport_register_device(), except
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* that it locates a device by its number rather than by the port
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* it is attached to.
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*
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* All parameters except for @devnum are the same as for
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* parport_register_device(). The return value is the same as
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* for parport_register_device().
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**/
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struct pardevice *parport_open(int devnum, const char *name)
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{
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struct daisydev *p = topology;
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struct parport *port;
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struct pardevice *dev;
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int daisy;
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spin_lock(&topology_lock);
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while (p && p->devnum != devnum)
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p = p->next;
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if (!p) {
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spin_unlock(&topology_lock);
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return NULL;
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}
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daisy = p->daisy;
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port = parport_get_port(p->port);
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spin_unlock(&topology_lock);
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dev = parport_register_device(port, name, NULL, NULL, NULL, 0, NULL);
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parport_put_port(port);
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if (!dev)
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return NULL;
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dev->daisy = daisy;
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/* Check that there really is a device to select. */
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if (daisy >= 0) {
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int selected;
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parport_claim_or_block(dev);
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selected = port->daisy;
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parport_release(dev);
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if (selected != daisy) {
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/* No corresponding device. */
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parport_unregister_device(dev);
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return NULL;
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}
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}
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return dev;
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}
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/**
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* parport_close - close a device opened with parport_open()
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* @dev: device to close
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*
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* This is to parport_open() as parport_unregister_device() is to
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* parport_register_device().
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**/
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void parport_close(struct pardevice *dev)
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{
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parport_unregister_device(dev);
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}
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/* Send a daisy-chain-style CPP command packet. */
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static int cpp_daisy(struct parport *port, int cmd)
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{
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unsigned char s;
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parport_data_forward(port);
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parport_write_data(port, 0xaa); udelay(2);
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parport_write_data(port, 0x55); udelay(2);
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parport_write_data(port, 0x00); udelay(2);
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parport_write_data(port, 0xff); udelay(2);
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s = parport_read_status(port) & (PARPORT_STATUS_BUSY
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| PARPORT_STATUS_PAPEROUT
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| PARPORT_STATUS_SELECT
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| PARPORT_STATUS_ERROR);
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if (s != (PARPORT_STATUS_BUSY
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| PARPORT_STATUS_PAPEROUT
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| PARPORT_STATUS_SELECT
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| PARPORT_STATUS_ERROR)) {
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DPRINTK(KERN_DEBUG "%s: cpp_daisy: aa5500ff(%02x)\n",
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port->name, s);
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return -ENXIO;
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}
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parport_write_data(port, 0x87); udelay(2);
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s = parport_read_status(port) & (PARPORT_STATUS_BUSY
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| PARPORT_STATUS_PAPEROUT
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| PARPORT_STATUS_SELECT
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| PARPORT_STATUS_ERROR);
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if (s != (PARPORT_STATUS_SELECT | PARPORT_STATUS_ERROR)) {
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DPRINTK(KERN_DEBUG "%s: cpp_daisy: aa5500ff87(%02x)\n",
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port->name, s);
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return -ENXIO;
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}
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parport_write_data(port, 0x78); udelay(2);
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parport_write_data(port, cmd); udelay(2);
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parport_frob_control(port,
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PARPORT_CONTROL_STROBE,
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PARPORT_CONTROL_STROBE);
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udelay(1);
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s = parport_read_status(port);
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parport_frob_control(port, PARPORT_CONTROL_STROBE, 0);
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udelay(1);
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parport_write_data(port, 0xff); udelay(2);
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return s;
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}
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/* Send a mux-style CPP command packet. */
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static int cpp_mux(struct parport *port, int cmd)
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{
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unsigned char s;
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int rc;
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parport_data_forward(port);
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parport_write_data(port, 0xaa); udelay(2);
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parport_write_data(port, 0x55); udelay(2);
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parport_write_data(port, 0xf0); udelay(2);
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parport_write_data(port, 0x0f); udelay(2);
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parport_write_data(port, 0x52); udelay(2);
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parport_write_data(port, 0xad); udelay(2);
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parport_write_data(port, cmd); udelay(2);
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s = parport_read_status(port);
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if (!(s & PARPORT_STATUS_ACK)) {
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DPRINTK(KERN_DEBUG "%s: cpp_mux: aa55f00f52ad%02x(%02x)\n",
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port->name, cmd, s);
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return -EIO;
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}
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rc = (((s & PARPORT_STATUS_SELECT ? 1 : 0) << 0) |
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((s & PARPORT_STATUS_PAPEROUT ? 1 : 0) << 1) |
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((s & PARPORT_STATUS_BUSY ? 0 : 1) << 2) |
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((s & PARPORT_STATUS_ERROR ? 0 : 1) << 3));
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return rc;
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}
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void parport_daisy_deselect_all(struct parport *port)
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{
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cpp_daisy(port, 0x30);
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}
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int parport_daisy_select(struct parport *port, int daisy, int mode)
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{
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switch (mode)
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{
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// For these modes we should switch to EPP mode:
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case IEEE1284_MODE_EPP:
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case IEEE1284_MODE_EPPSL:
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case IEEE1284_MODE_EPPSWE:
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return !(cpp_daisy(port, 0x20 + daisy) &
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PARPORT_STATUS_ERROR);
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// For these modes we should switch to ECP mode:
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case IEEE1284_MODE_ECP:
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case IEEE1284_MODE_ECPRLE:
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case IEEE1284_MODE_ECPSWE:
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return !(cpp_daisy(port, 0xd0 + daisy) &
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PARPORT_STATUS_ERROR);
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// Nothing was told for BECP in Daisy chain specification.
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// May be it's wise to use ECP?
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case IEEE1284_MODE_BECP:
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// Others use compat mode
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case IEEE1284_MODE_NIBBLE:
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case IEEE1284_MODE_BYTE:
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case IEEE1284_MODE_COMPAT:
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default:
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return !(cpp_daisy(port, 0xe0 + daisy) &
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PARPORT_STATUS_ERROR);
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}
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}
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static int mux_present(struct parport *port)
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{
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return cpp_mux(port, 0x51) == 3;
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}
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static int num_mux_ports(struct parport *port)
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{
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return cpp_mux(port, 0x58);
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}
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static int select_port(struct parport *port)
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{
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int muxport = port->muxport;
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return cpp_mux(port, 0x60 + muxport) == muxport;
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}
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static int assign_addrs(struct parport *port)
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{
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unsigned char s;
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unsigned char daisy;
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int thisdev = numdevs;
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int detected;
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char *deviceid;
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parport_data_forward(port);
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parport_write_data(port, 0xaa); udelay(2);
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parport_write_data(port, 0x55); udelay(2);
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parport_write_data(port, 0x00); udelay(2);
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parport_write_data(port, 0xff); udelay(2);
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s = parport_read_status(port) & (PARPORT_STATUS_BUSY
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| PARPORT_STATUS_PAPEROUT
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| PARPORT_STATUS_SELECT
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| PARPORT_STATUS_ERROR);
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if (s != (PARPORT_STATUS_BUSY
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| PARPORT_STATUS_PAPEROUT
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| PARPORT_STATUS_SELECT
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| PARPORT_STATUS_ERROR)) {
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DPRINTK(KERN_DEBUG "%s: assign_addrs: aa5500ff(%02x)\n",
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port->name, s);
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return 0;
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}
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parport_write_data(port, 0x87); udelay(2);
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s = parport_read_status(port) & (PARPORT_STATUS_BUSY
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| PARPORT_STATUS_PAPEROUT
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| PARPORT_STATUS_SELECT
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| PARPORT_STATUS_ERROR);
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if (s != (PARPORT_STATUS_SELECT | PARPORT_STATUS_ERROR)) {
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DPRINTK(KERN_DEBUG "%s: assign_addrs: aa5500ff87(%02x)\n",
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port->name, s);
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return 0;
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}
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parport_write_data(port, 0x78); udelay(2);
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s = parport_read_status(port);
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for (daisy = 0;
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(s & (PARPORT_STATUS_PAPEROUT|PARPORT_STATUS_SELECT))
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== (PARPORT_STATUS_PAPEROUT|PARPORT_STATUS_SELECT)
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&& daisy < 4;
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++daisy) {
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parport_write_data(port, daisy);
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udelay(2);
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parport_frob_control(port,
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PARPORT_CONTROL_STROBE,
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PARPORT_CONTROL_STROBE);
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udelay(1);
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parport_frob_control(port, PARPORT_CONTROL_STROBE, 0);
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udelay(1);
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|
|
|
add_dev(numdevs++, port, daisy);
|
|
|
|
/* See if this device thought it was the last in the
|
|
* chain. */
|
|
if (!(s & PARPORT_STATUS_BUSY))
|
|
break;
|
|
|
|
/* We are seeing pass through status now. We see
|
|
last_dev from next device or if last_dev does not
|
|
work status lines from some non-daisy chain
|
|
device. */
|
|
s = parport_read_status(port);
|
|
}
|
|
|
|
parport_write_data(port, 0xff); udelay(2);
|
|
detected = numdevs - thisdev;
|
|
DPRINTK(KERN_DEBUG "%s: Found %d daisy-chained devices\n", port->name,
|
|
detected);
|
|
|
|
/* Ask the new devices to introduce themselves. */
|
|
deviceid = kmalloc(1024, GFP_KERNEL);
|
|
if (!deviceid) return 0;
|
|
|
|
for (daisy = 0; thisdev < numdevs; thisdev++, daisy++)
|
|
parport_device_id(thisdev, deviceid, 1024);
|
|
|
|
kfree(deviceid);
|
|
return detected;
|
|
}
|