Revision 7f0801e566cc78315e5dc383bf3c3b5b5b436048 authored by Damien Lespiau on 05 February 2015, 19:35:13 UTC, committed by Jani Nikula on 18 March 2015, 08:09:05 UTC
We don't want to end up in a state where we track that the pipe has its primary plane enabled when primary plane registers are programmed with values that look possible but the plane actually disabled. Refuse to read out the fb state when the primary plane isn't enabled. Suggested-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Suggested-by: Matt Roper <matthew.d.roper@intel.com> Signed-off-by: Damien Lespiau <damien.lespiau@intel.com> Reviewed-by: Matt Roper <matthew.d.roper@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Reported-by: Andrey Skvortsov <andrej.skvortzov@gmail.com> Reported-by: Steven Rostedt <rostedt@goodmis.org> Reference: http://mid.gmane.org/20150203191507.GA2374@crion86 Tested-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
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parport_gsc.c
/*
* Low-level parallel-support for PC-style hardware integrated in the
* LASI-Controller (on GSC-Bus) for HP-PARISC Workstations
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* (C) 1999-2001 by Helge Deller <deller@gmx.de>
*
*
* based on parport_pc.c by
* Grant Guenther <grant@torque.net>
* Phil Blundell <philb@gnu.org>
* Tim Waugh <tim@cyberelk.demon.co.uk>
* Jose Renau <renau@acm.org>
* David Campbell
* Andrea Arcangeli
*/
#undef DEBUG /* undef for production */
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/sysctl.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/uaccess.h>
#include <asm/superio.h>
#include <linux/parport.h>
#include <asm/pdc.h>
#include <asm/parisc-device.h>
#include <asm/hardware.h>
#include "parport_gsc.h"
MODULE_AUTHOR("Helge Deller <deller@gmx.de>");
MODULE_DESCRIPTION("HP-PARISC PC-style parallel port driver");
MODULE_SUPPORTED_DEVICE("integrated PC-style parallel port");
MODULE_LICENSE("GPL");
/*
* Clear TIMEOUT BIT in EPP MODE
*
* This is also used in SPP detection.
*/
static int clear_epp_timeout(struct parport *pb)
{
unsigned char r;
if (!(parport_gsc_read_status(pb) & 0x01))
return 1;
/* To clear timeout some chips require double read */
parport_gsc_read_status(pb);
r = parport_gsc_read_status(pb);
parport_writeb (r | 0x01, STATUS (pb)); /* Some reset by writing 1 */
parport_writeb (r & 0xfe, STATUS (pb)); /* Others by writing 0 */
r = parport_gsc_read_status(pb);
return !(r & 0x01);
}
/*
* Access functions.
*
* Most of these aren't static because they may be used by the
* parport_xxx_yyy macros. extern __inline__ versions of several
* of these are in parport_gsc.h.
*/
void parport_gsc_init_state(struct pardevice *dev, struct parport_state *s)
{
s->u.pc.ctr = 0xc | (dev->irq_func ? 0x10 : 0x0);
}
void parport_gsc_save_state(struct parport *p, struct parport_state *s)
{
s->u.pc.ctr = parport_readb (CONTROL (p));
}
void parport_gsc_restore_state(struct parport *p, struct parport_state *s)
{
parport_writeb (s->u.pc.ctr, CONTROL (p));
}
struct parport_operations parport_gsc_ops =
{
.write_data = parport_gsc_write_data,
.read_data = parport_gsc_read_data,
.write_control = parport_gsc_write_control,
.read_control = parport_gsc_read_control,
.frob_control = parport_gsc_frob_control,
.read_status = parport_gsc_read_status,
.enable_irq = parport_gsc_enable_irq,
.disable_irq = parport_gsc_disable_irq,
.data_forward = parport_gsc_data_forward,
.data_reverse = parport_gsc_data_reverse,
.init_state = parport_gsc_init_state,
.save_state = parport_gsc_save_state,
.restore_state = parport_gsc_restore_state,
.epp_write_data = parport_ieee1284_epp_write_data,
.epp_read_data = parport_ieee1284_epp_read_data,
.epp_write_addr = parport_ieee1284_epp_write_addr,
.epp_read_addr = parport_ieee1284_epp_read_addr,
.ecp_write_data = parport_ieee1284_ecp_write_data,
.ecp_read_data = parport_ieee1284_ecp_read_data,
.ecp_write_addr = parport_ieee1284_ecp_write_addr,
.compat_write_data = parport_ieee1284_write_compat,
.nibble_read_data = parport_ieee1284_read_nibble,
.byte_read_data = parport_ieee1284_read_byte,
.owner = THIS_MODULE,
};
/* --- Mode detection ------------------------------------- */
/*
* Checks for port existence, all ports support SPP MODE
*/
static int parport_SPP_supported(struct parport *pb)
{
unsigned char r, w;
/*
* first clear an eventually pending EPP timeout
* I (sailer@ife.ee.ethz.ch) have an SMSC chipset
* that does not even respond to SPP cycles if an EPP
* timeout is pending
*/
clear_epp_timeout(pb);
/* Do a simple read-write test to make sure the port exists. */
w = 0xc;
parport_writeb (w, CONTROL (pb));
/* Is there a control register that we can read from? Some
* ports don't allow reads, so read_control just returns a
* software copy. Some ports _do_ allow reads, so bypass the
* software copy here. In addition, some bits aren't
* writable. */
r = parport_readb (CONTROL (pb));
if ((r & 0xf) == w) {
w = 0xe;
parport_writeb (w, CONTROL (pb));
r = parport_readb (CONTROL (pb));
parport_writeb (0xc, CONTROL (pb));
if ((r & 0xf) == w)
return PARPORT_MODE_PCSPP;
}
/* Try the data register. The data lines aren't tri-stated at
* this stage, so we expect back what we wrote. */
w = 0xaa;
parport_gsc_write_data (pb, w);
r = parport_gsc_read_data (pb);
if (r == w) {
w = 0x55;
parport_gsc_write_data (pb, w);
r = parport_gsc_read_data (pb);
if (r == w)
return PARPORT_MODE_PCSPP;
}
return 0;
}
/* Detect PS/2 support.
*
* Bit 5 (0x20) sets the PS/2 data direction; setting this high
* allows us to read data from the data lines. In theory we would get back
* 0xff but any peripheral attached to the port may drag some or all of the
* lines down to zero. So if we get back anything that isn't the contents
* of the data register we deem PS/2 support to be present.
*
* Some SPP ports have "half PS/2" ability - you can't turn off the line
* drivers, but an external peripheral with sufficiently beefy drivers of
* its own can overpower them and assert its own levels onto the bus, from
* where they can then be read back as normal. Ports with this property
* and the right type of device attached are likely to fail the SPP test,
* (as they will appear to have stuck bits) and so the fact that they might
* be misdetected here is rather academic.
*/
static int parport_PS2_supported(struct parport *pb)
{
int ok = 0;
clear_epp_timeout(pb);
/* try to tri-state the buffer */
parport_gsc_data_reverse (pb);
parport_gsc_write_data(pb, 0x55);
if (parport_gsc_read_data(pb) != 0x55) ok++;
parport_gsc_write_data(pb, 0xaa);
if (parport_gsc_read_data(pb) != 0xaa) ok++;
/* cancel input mode */
parport_gsc_data_forward (pb);
if (ok) {
pb->modes |= PARPORT_MODE_TRISTATE;
} else {
struct parport_gsc_private *priv = pb->private_data;
priv->ctr_writable &= ~0x20;
}
return ok;
}
/* --- Initialisation code -------------------------------- */
struct parport *parport_gsc_probe_port(unsigned long base,
unsigned long base_hi, int irq,
int dma, struct parisc_device *padev)
{
struct parport_gsc_private *priv;
struct parport_operations *ops;
struct parport tmp;
struct parport *p = &tmp;
priv = kzalloc (sizeof (struct parport_gsc_private), GFP_KERNEL);
if (!priv) {
printk (KERN_DEBUG "parport (0x%lx): no memory!\n", base);
return NULL;
}
ops = kmemdup(&parport_gsc_ops, sizeof(struct parport_operations),
GFP_KERNEL);
if (!ops) {
printk (KERN_DEBUG "parport (0x%lx): no memory for ops!\n",
base);
kfree (priv);
return NULL;
}
priv->ctr = 0xc;
priv->ctr_writable = 0xff;
priv->dma_buf = 0;
priv->dma_handle = 0;
p->base = base;
p->base_hi = base_hi;
p->irq = irq;
p->dma = dma;
p->modes = PARPORT_MODE_PCSPP | PARPORT_MODE_SAFEININT;
p->ops = ops;
p->private_data = priv;
p->physport = p;
if (!parport_SPP_supported (p)) {
/* No port. */
kfree (priv);
kfree(ops);
return NULL;
}
parport_PS2_supported (p);
if (!(p = parport_register_port(base, PARPORT_IRQ_NONE,
PARPORT_DMA_NONE, ops))) {
kfree (priv);
kfree (ops);
return NULL;
}
p->dev = &padev->dev;
p->base_hi = base_hi;
p->modes = tmp.modes;
p->size = (p->modes & PARPORT_MODE_EPP)?8:3;
p->private_data = priv;
printk(KERN_INFO "%s: PC-style at 0x%lx", p->name, p->base);
p->irq = irq;
if (p->irq == PARPORT_IRQ_AUTO) {
p->irq = PARPORT_IRQ_NONE;
}
if (p->irq != PARPORT_IRQ_NONE) {
printk(", irq %d", p->irq);
if (p->dma == PARPORT_DMA_AUTO) {
p->dma = PARPORT_DMA_NONE;
}
}
if (p->dma == PARPORT_DMA_AUTO) /* To use DMA, giving the irq
is mandatory (see above) */
p->dma = PARPORT_DMA_NONE;
printk(" [");
#define printmode(x) {if(p->modes&PARPORT_MODE_##x){printk("%s%s",f?",":"",#x);f++;}}
{
int f = 0;
printmode(PCSPP);
printmode(TRISTATE);
printmode(COMPAT)
printmode(EPP);
// printmode(ECP);
// printmode(DMA);
}
#undef printmode
printk("]\n");
if (p->irq != PARPORT_IRQ_NONE) {
if (request_irq (p->irq, parport_irq_handler,
0, p->name, p)) {
printk (KERN_WARNING "%s: irq %d in use, "
"resorting to polled operation\n",
p->name, p->irq);
p->irq = PARPORT_IRQ_NONE;
p->dma = PARPORT_DMA_NONE;
}
}
/* Done probing. Now put the port into a sensible start-up state. */
parport_gsc_write_data(p, 0);
parport_gsc_data_forward (p);
/* Now that we've told the sharing engine about the port, and
found out its characteristics, let the high-level drivers
know about it. */
parport_announce_port (p);
return p;
}
#define PARPORT_GSC_OFFSET 0x800
static int parport_count;
static int parport_init_chip(struct parisc_device *dev)
{
struct parport *p;
unsigned long port;
if (!dev->irq) {
printk(KERN_WARNING "IRQ not found for parallel device at 0x%llx\n",
(unsigned long long)dev->hpa.start);
return -ENODEV;
}
port = dev->hpa.start + PARPORT_GSC_OFFSET;
/* some older machines with ASP-chip don't support
* the enhanced parport modes.
*/
if (boot_cpu_data.cpu_type > pcxt && !pdc_add_valid(port+4)) {
/* Initialize bidirectional-mode (0x10) & data-tranfer-mode #1 (0x20) */
printk("%s: initialize bidirectional-mode.\n", __func__);
parport_writeb ( (0x10 + 0x20), port + 4);
} else {
printk("%s: enhanced parport-modes not supported.\n", __func__);
}
p = parport_gsc_probe_port(port, 0, dev->irq,
/* PARPORT_IRQ_NONE */ PARPORT_DMA_NONE, dev);
if (p)
parport_count++;
dev_set_drvdata(&dev->dev, p);
return 0;
}
static int parport_remove_chip(struct parisc_device *dev)
{
struct parport *p = dev_get_drvdata(&dev->dev);
if (p) {
struct parport_gsc_private *priv = p->private_data;
struct parport_operations *ops = p->ops;
parport_remove_port(p);
if (p->dma != PARPORT_DMA_NONE)
free_dma(p->dma);
if (p->irq != PARPORT_IRQ_NONE)
free_irq(p->irq, p);
if (priv->dma_buf)
pci_free_consistent(priv->dev, PAGE_SIZE,
priv->dma_buf,
priv->dma_handle);
kfree (p->private_data);
parport_put_port(p);
kfree (ops); /* hope no-one cached it */
}
return 0;
}
static struct parisc_device_id parport_tbl[] = {
{ HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x74 },
{ 0, }
};
MODULE_DEVICE_TABLE(parisc, parport_tbl);
static struct parisc_driver parport_driver = {
.name = "Parallel",
.id_table = parport_tbl,
.probe = parport_init_chip,
.remove = parport_remove_chip,
};
int parport_gsc_init(void)
{
return register_parisc_driver(&parport_driver);
}
static void parport_gsc_exit(void)
{
unregister_parisc_driver(&parport_driver);
}
module_init(parport_gsc_init);
module_exit(parport_gsc_exit);
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