linux/drivers/input/serio/at32psif.c
Tejun Heo 5a0e3ad6af include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
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>
2010-03-30 22:02:32 +09:00

378 lines
8.4 KiB
C

/*
* Copyright (C) 2007 Atmel Corporation
*
* Driver for the AT32AP700X PS/2 controller (PSIF).
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/serio.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
/* PSIF register offsets */
#define PSIF_CR 0x00
#define PSIF_RHR 0x04
#define PSIF_THR 0x08
#define PSIF_SR 0x10
#define PSIF_IER 0x14
#define PSIF_IDR 0x18
#define PSIF_IMR 0x1c
#define PSIF_PSR 0x24
/* Bitfields in control register. */
#define PSIF_CR_RXDIS_OFFSET 1
#define PSIF_CR_RXDIS_SIZE 1
#define PSIF_CR_RXEN_OFFSET 0
#define PSIF_CR_RXEN_SIZE 1
#define PSIF_CR_SWRST_OFFSET 15
#define PSIF_CR_SWRST_SIZE 1
#define PSIF_CR_TXDIS_OFFSET 9
#define PSIF_CR_TXDIS_SIZE 1
#define PSIF_CR_TXEN_OFFSET 8
#define PSIF_CR_TXEN_SIZE 1
/* Bitfields in interrupt disable, enable, mask and status register. */
#define PSIF_NACK_OFFSET 8
#define PSIF_NACK_SIZE 1
#define PSIF_OVRUN_OFFSET 5
#define PSIF_OVRUN_SIZE 1
#define PSIF_PARITY_OFFSET 9
#define PSIF_PARITY_SIZE 1
#define PSIF_RXRDY_OFFSET 4
#define PSIF_RXRDY_SIZE 1
#define PSIF_TXEMPTY_OFFSET 1
#define PSIF_TXEMPTY_SIZE 1
#define PSIF_TXRDY_OFFSET 0
#define PSIF_TXRDY_SIZE 1
/* Bitfields in prescale register. */
#define PSIF_PSR_PRSCV_OFFSET 0
#define PSIF_PSR_PRSCV_SIZE 12
/* Bitfields in receive hold register. */
#define PSIF_RHR_RXDATA_OFFSET 0
#define PSIF_RHR_RXDATA_SIZE 8
/* Bitfields in transmit hold register. */
#define PSIF_THR_TXDATA_OFFSET 0
#define PSIF_THR_TXDATA_SIZE 8
/* Bit manipulation macros */
#define PSIF_BIT(name) \
(1 << PSIF_##name##_OFFSET)
#define PSIF_BF(name, value) \
(((value) & ((1 << PSIF_##name##_SIZE) - 1)) \
<< PSIF_##name##_OFFSET)
#define PSIF_BFEXT(name, value) \
(((value) >> PSIF_##name##_OFFSET) \
& ((1 << PSIF_##name##_SIZE) - 1))
#define PSIF_BFINS(name, value, old) \
(((old) & ~(((1 << PSIF_##name##_SIZE) - 1) \
<< PSIF_##name##_OFFSET)) \
| PSIF_BF(name, value))
/* Register access macros */
#define psif_readl(port, reg) \
__raw_readl((port)->regs + PSIF_##reg)
#define psif_writel(port, reg, value) \
__raw_writel((value), (port)->regs + PSIF_##reg)
struct psif {
struct platform_device *pdev;
struct clk *pclk;
struct serio *io;
void __iomem *regs;
unsigned int irq;
unsigned int open;
/* Prevent concurrent writes to PSIF THR. */
spinlock_t lock;
};
static irqreturn_t psif_interrupt(int irq, void *_ptr)
{
struct psif *psif = _ptr;
int retval = IRQ_NONE;
unsigned int io_flags = 0;
unsigned long status;
status = psif_readl(psif, SR);
if (status & PSIF_BIT(RXRDY)) {
unsigned char val = (unsigned char) psif_readl(psif, RHR);
if (status & PSIF_BIT(PARITY))
io_flags |= SERIO_PARITY;
if (status & PSIF_BIT(OVRUN))
dev_err(&psif->pdev->dev, "overrun read error\n");
serio_interrupt(psif->io, val, io_flags);
retval = IRQ_HANDLED;
}
return retval;
}
static int psif_write(struct serio *io, unsigned char val)
{
struct psif *psif = io->port_data;
unsigned long flags;
int timeout = 10;
int retval = 0;
spin_lock_irqsave(&psif->lock, flags);
while (!(psif_readl(psif, SR) & PSIF_BIT(TXEMPTY)) && timeout--)
udelay(50);
if (timeout >= 0) {
psif_writel(psif, THR, val);
} else {
dev_dbg(&psif->pdev->dev, "timeout writing to THR\n");
retval = -EBUSY;
}
spin_unlock_irqrestore(&psif->lock, flags);
return retval;
}
static int psif_open(struct serio *io)
{
struct psif *psif = io->port_data;
int retval;
retval = clk_enable(psif->pclk);
if (retval)
goto out;
psif_writel(psif, CR, PSIF_BIT(CR_TXEN) | PSIF_BIT(CR_RXEN));
psif_writel(psif, IER, PSIF_BIT(RXRDY));
psif->open = 1;
out:
return retval;
}
static void psif_close(struct serio *io)
{
struct psif *psif = io->port_data;
psif->open = 0;
psif_writel(psif, IDR, ~0UL);
psif_writel(psif, CR, PSIF_BIT(CR_TXDIS) | PSIF_BIT(CR_RXDIS));
clk_disable(psif->pclk);
}
static void psif_set_prescaler(struct psif *psif)
{
unsigned long prscv;
unsigned long rate = clk_get_rate(psif->pclk);
/* PRSCV = Pulse length (100 us) * PSIF module frequency. */
prscv = 100 * (rate / 1000000UL);
if (prscv > ((1<<PSIF_PSR_PRSCV_SIZE) - 1)) {
prscv = (1<<PSIF_PSR_PRSCV_SIZE) - 1;
dev_dbg(&psif->pdev->dev, "pclk too fast, "
"prescaler set to max\n");
}
clk_enable(psif->pclk);
psif_writel(psif, PSR, prscv);
clk_disable(psif->pclk);
}
static int __init psif_probe(struct platform_device *pdev)
{
struct resource *regs;
struct psif *psif;
struct serio *io;
struct clk *pclk;
int irq;
int ret;
psif = kzalloc(sizeof(struct psif), GFP_KERNEL);
if (!psif) {
dev_dbg(&pdev->dev, "out of memory\n");
ret = -ENOMEM;
goto out;
}
psif->pdev = pdev;
io = kzalloc(sizeof(struct serio), GFP_KERNEL);
if (!io) {
dev_dbg(&pdev->dev, "out of memory\n");
ret = -ENOMEM;
goto out_free_psif;
}
psif->io = io;
regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!regs) {
dev_dbg(&pdev->dev, "no mmio resources defined\n");
ret = -ENOMEM;
goto out_free_io;
}
psif->regs = ioremap(regs->start, resource_size(regs));
if (!psif->regs) {
ret = -ENOMEM;
dev_dbg(&pdev->dev, "could not map I/O memory\n");
goto out_free_io;
}
pclk = clk_get(&pdev->dev, "pclk");
if (IS_ERR(pclk)) {
dev_dbg(&pdev->dev, "could not get peripheral clock\n");
ret = PTR_ERR(pclk);
goto out_iounmap;
}
psif->pclk = pclk;
/* Reset the PSIF to enter at a known state. */
ret = clk_enable(pclk);
if (ret) {
dev_dbg(&pdev->dev, "could not enable pclk\n");
goto out_put_clk;
}
psif_writel(psif, CR, PSIF_BIT(CR_SWRST));
clk_disable(pclk);
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_dbg(&pdev->dev, "could not get irq\n");
ret = -ENXIO;
goto out_put_clk;
}
ret = request_irq(irq, psif_interrupt, IRQF_SHARED, "at32psif", psif);
if (ret) {
dev_dbg(&pdev->dev, "could not request irq %d\n", irq);
goto out_put_clk;
}
psif->irq = irq;
io->id.type = SERIO_8042;
io->write = psif_write;
io->open = psif_open;
io->close = psif_close;
snprintf(io->name, sizeof(io->name), "AVR32 PS/2 port%d", pdev->id);
snprintf(io->phys, sizeof(io->phys), "at32psif/serio%d", pdev->id);
io->port_data = psif;
io->dev.parent = &pdev->dev;
psif_set_prescaler(psif);
spin_lock_init(&psif->lock);
serio_register_port(psif->io);
platform_set_drvdata(pdev, psif);
dev_info(&pdev->dev, "Atmel AVR32 PSIF PS/2 driver on 0x%08x irq %d\n",
(int)psif->regs, psif->irq);
return 0;
out_put_clk:
clk_put(psif->pclk);
out_iounmap:
iounmap(psif->regs);
out_free_io:
kfree(io);
out_free_psif:
kfree(psif);
out:
return ret;
}
static int __exit psif_remove(struct platform_device *pdev)
{
struct psif *psif = platform_get_drvdata(pdev);
psif_writel(psif, IDR, ~0UL);
psif_writel(psif, CR, PSIF_BIT(CR_TXDIS) | PSIF_BIT(CR_RXDIS));
serio_unregister_port(psif->io);
iounmap(psif->regs);
free_irq(psif->irq, psif);
clk_put(psif->pclk);
kfree(psif);
platform_set_drvdata(pdev, NULL);
return 0;
}
#ifdef CONFIG_PM
static int psif_suspend(struct platform_device *pdev, pm_message_t state)
{
struct psif *psif = platform_get_drvdata(pdev);
if (psif->open) {
psif_writel(psif, CR, PSIF_BIT(CR_RXDIS) | PSIF_BIT(CR_TXDIS));
clk_disable(psif->pclk);
}
return 0;
}
static int psif_resume(struct platform_device *pdev)
{
struct psif *psif = platform_get_drvdata(pdev);
if (psif->open) {
clk_enable(psif->pclk);
psif_set_prescaler(psif);
psif_writel(psif, CR, PSIF_BIT(CR_RXEN) | PSIF_BIT(CR_TXEN));
}
return 0;
}
#else
#define psif_suspend NULL
#define psif_resume NULL
#endif
static struct platform_driver psif_driver = {
.remove = __exit_p(psif_remove),
.driver = {
.name = "atmel_psif",
.owner = THIS_MODULE,
},
.suspend = psif_suspend,
.resume = psif_resume,
};
static int __init psif_init(void)
{
return platform_driver_probe(&psif_driver, psif_probe);
}
static void __exit psif_exit(void)
{
platform_driver_unregister(&psif_driver);
}
module_init(psif_init);
module_exit(psif_exit);
MODULE_AUTHOR("Hans-Christian Egtvedt <hans-christian.egtvedt@atmel.com>");
MODULE_DESCRIPTION("Atmel AVR32 PSIF PS/2 driver");
MODULE_LICENSE("GPL");