Revision b4cd08aa1f53c831e67dc5c6bc9f9acff27abcba authored by Wolfram Sang on 16 December 2015, 19:05:18 UTC, committed by Wolfram Sang on 19 December 2015, 11:00:37 UTC
When we also are I2C slave, we need to disable runtime PM because the address detection mechanism needs to be active all the time. However, we can reenable runtime PM once the slave instance was unregistered. So, use pm_runtime_get_sync/put to achieve this, since it has proper refcounting. pm_runtime_allow/forbid is like a global knob controllable from userspace which is unsuitable here. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Cc: stable@kernel.org
1 parent e79e72c
parport_gsc.h
/*
* Low-level parallel-support for PC-style hardware integrated in the
* LASI-Controller (on GSC-Bus) for HP-PARISC Workstations
*
* (C) 1999-2001 by Helge Deller <deller@gmx.de>
*
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* based on parport_pc.c by
* Grant Guenther <grant@torque.net>
* Phil Blundell <Philip.Blundell@pobox.com>
* Tim Waugh <tim@cyberelk.demon.co.uk>
* Jose Renau <renau@acm.org>
* David Campbell
* Andrea Arcangeli
*/
#ifndef __DRIVERS_PARPORT_PARPORT_GSC_H
#define __DRIVERS_PARPORT_PARPORT_GSC_H
#include <asm/io.h>
#include <linux/delay.h>
#undef DEBUG_PARPORT /* undefine for production */
#define DELAY_TIME 0
#if DELAY_TIME == 0
#define parport_readb gsc_readb
#define parport_writeb gsc_writeb
#else
static __inline__ unsigned char parport_readb( unsigned long port )
{
udelay(DELAY_TIME);
return gsc_readb(port);
}
static __inline__ void parport_writeb( unsigned char value, unsigned long port )
{
gsc_writeb(value,port);
udelay(DELAY_TIME);
}
#endif
/* --- register definitions ------------------------------- */
#define EPPDATA(p) ((p)->base + 0x4)
#define EPPADDR(p) ((p)->base + 0x3)
#define CONTROL(p) ((p)->base + 0x2)
#define STATUS(p) ((p)->base + 0x1)
#define DATA(p) ((p)->base + 0x0)
struct parport_gsc_private {
/* Contents of CTR. */
unsigned char ctr;
/* Bitmask of writable CTR bits. */
unsigned char ctr_writable;
/* Number of bytes per portword. */
int pword;
/* Not used yet. */
int readIntrThreshold;
int writeIntrThreshold;
/* buffer suitable for DMA, if DMA enabled */
char *dma_buf;
dma_addr_t dma_handle;
struct pci_dev *dev;
};
static inline void parport_gsc_write_data(struct parport *p, unsigned char d)
{
#ifdef DEBUG_PARPORT
printk (KERN_DEBUG "parport_gsc_write_data(%p,0x%02x)\n", p, d);
#endif
parport_writeb(d, DATA(p));
}
static inline unsigned char parport_gsc_read_data(struct parport *p)
{
unsigned char val = parport_readb (DATA (p));
#ifdef DEBUG_PARPORT
printk (KERN_DEBUG "parport_gsc_read_data(%p) = 0x%02x\n",
p, val);
#endif
return val;
}
/* __parport_gsc_frob_control differs from parport_gsc_frob_control in that
* it doesn't do any extra masking. */
static inline unsigned char __parport_gsc_frob_control(struct parport *p,
unsigned char mask,
unsigned char val)
{
struct parport_gsc_private *priv = p->physport->private_data;
unsigned char ctr = priv->ctr;
#ifdef DEBUG_PARPORT
printk (KERN_DEBUG
"__parport_gsc_frob_control(%02x,%02x): %02x -> %02x\n",
mask, val, ctr, ((ctr & ~mask) ^ val) & priv->ctr_writable);
#endif
ctr = (ctr & ~mask) ^ val;
ctr &= priv->ctr_writable; /* only write writable bits. */
parport_writeb (ctr, CONTROL (p));
priv->ctr = ctr; /* Update soft copy */
return ctr;
}
static inline void parport_gsc_data_reverse(struct parport *p)
{
__parport_gsc_frob_control (p, 0x20, 0x20);
}
static inline void parport_gsc_data_forward(struct parport *p)
{
__parport_gsc_frob_control (p, 0x20, 0x00);
}
static inline void parport_gsc_write_control(struct parport *p,
unsigned char d)
{
const unsigned char wm = (PARPORT_CONTROL_STROBE |
PARPORT_CONTROL_AUTOFD |
PARPORT_CONTROL_INIT |
PARPORT_CONTROL_SELECT);
/* Take this out when drivers have adapted to newer interface. */
if (d & 0x20) {
printk (KERN_DEBUG "%s (%s): use data_reverse for this!\n",
p->name, p->cad->name);
parport_gsc_data_reverse (p);
}
__parport_gsc_frob_control (p, wm, d & wm);
}
static inline unsigned char parport_gsc_read_control(struct parport *p)
{
const unsigned char rm = (PARPORT_CONTROL_STROBE |
PARPORT_CONTROL_AUTOFD |
PARPORT_CONTROL_INIT |
PARPORT_CONTROL_SELECT);
const struct parport_gsc_private *priv = p->physport->private_data;
return priv->ctr & rm; /* Use soft copy */
}
static inline unsigned char parport_gsc_frob_control(struct parport *p,
unsigned char mask,
unsigned char val)
{
const unsigned char wm = (PARPORT_CONTROL_STROBE |
PARPORT_CONTROL_AUTOFD |
PARPORT_CONTROL_INIT |
PARPORT_CONTROL_SELECT);
/* Take this out when drivers have adapted to newer interface. */
if (mask & 0x20) {
printk (KERN_DEBUG "%s (%s): use data_%s for this!\n",
p->name, p->cad->name,
(val & 0x20) ? "reverse" : "forward");
if (val & 0x20)
parport_gsc_data_reverse (p);
else
parport_gsc_data_forward (p);
}
/* Restrict mask and val to control lines. */
mask &= wm;
val &= wm;
return __parport_gsc_frob_control (p, mask, val);
}
static inline unsigned char parport_gsc_read_status(struct parport *p)
{
return parport_readb (STATUS(p));
}
static inline void parport_gsc_disable_irq(struct parport *p)
{
__parport_gsc_frob_control (p, 0x10, 0x00);
}
static inline void parport_gsc_enable_irq(struct parport *p)
{
__parport_gsc_frob_control (p, 0x10, 0x10);
}
extern void parport_gsc_release_resources(struct parport *p);
extern int parport_gsc_claim_resources(struct parport *p);
extern void parport_gsc_init_state(struct pardevice *, struct parport_state *s);
extern void parport_gsc_save_state(struct parport *p, struct parport_state *s);
extern void parport_gsc_restore_state(struct parport *p, struct parport_state *s);
extern void parport_gsc_inc_use_count(void);
extern void parport_gsc_dec_use_count(void);
extern struct parport *parport_gsc_probe_port(unsigned long base,
unsigned long base_hi,
int irq, int dma,
struct parisc_device *padev);
#endif /* __DRIVERS_PARPORT_PARPORT_GSC_H */
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