linux/drivers/mfd/mcp-sa11x0.c
Linus Torvalds 0195c00244 Disintegrate and delete asm/system.h
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Merge tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system

Pull "Disintegrate and delete asm/system.h" from David Howells:
 "Here are a bunch of patches to disintegrate asm/system.h into a set of
  separate bits to relieve the problem of circular inclusion
  dependencies.

  I've built all the working defconfigs from all the arches that I can
  and made sure that they don't break.

  The reason for these patches is that I recently encountered a circular
  dependency problem that came about when I produced some patches to
  optimise get_order() by rewriting it to use ilog2().

  This uses bitops - and on the SH arch asm/bitops.h drags in
  asm-generic/get_order.h by a circuituous route involving asm/system.h.

  The main difficulty seems to be asm/system.h.  It holds a number of
  low level bits with no/few dependencies that are commonly used (eg.
  memory barriers) and a number of bits with more dependencies that
  aren't used in many places (eg.  switch_to()).

  These patches break asm/system.h up into the following core pieces:

    (1) asm/barrier.h

        Move memory barriers here.  This already done for MIPS and Alpha.

    (2) asm/switch_to.h

        Move switch_to() and related stuff here.

    (3) asm/exec.h

        Move arch_align_stack() here.  Other process execution related bits
        could perhaps go here from asm/processor.h.

    (4) asm/cmpxchg.h

        Move xchg() and cmpxchg() here as they're full word atomic ops and
        frequently used by atomic_xchg() and atomic_cmpxchg().

    (5) asm/bug.h

        Move die() and related bits.

    (6) asm/auxvec.h

        Move AT_VECTOR_SIZE_ARCH here.

  Other arch headers are created as needed on a per-arch basis."

Fixed up some conflicts from other header file cleanups and moving code
around that has happened in the meantime, so David's testing is somewhat
weakened by that.  We'll find out anything that got broken and fix it..

* tag 'split-asm_system_h-for-linus-20120328' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-asm_system: (38 commits)
  Delete all instances of asm/system.h
  Remove all #inclusions of asm/system.h
  Add #includes needed to permit the removal of asm/system.h
  Move all declarations of free_initmem() to linux/mm.h
  Disintegrate asm/system.h for OpenRISC
  Split arch_align_stack() out from asm-generic/system.h
  Split the switch_to() wrapper out of asm-generic/system.h
  Move the asm-generic/system.h xchg() implementation to asm-generic/cmpxchg.h
  Create asm-generic/barrier.h
  Make asm-generic/cmpxchg.h #include asm-generic/cmpxchg-local.h
  Disintegrate asm/system.h for Xtensa
  Disintegrate asm/system.h for Unicore32 [based on ver #3, changed by gxt]
  Disintegrate asm/system.h for Tile
  Disintegrate asm/system.h for Sparc
  Disintegrate asm/system.h for SH
  Disintegrate asm/system.h for Score
  Disintegrate asm/system.h for S390
  Disintegrate asm/system.h for PowerPC
  Disintegrate asm/system.h for PA-RISC
  Disintegrate asm/system.h for MN10300
  ...
2012-03-28 15:58:21 -07:00

320 lines
7.1 KiB
C

/*
* linux/drivers/mfd/mcp-sa11x0.c
*
* Copyright (C) 2001-2005 Russell King
*
* 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.
*
* SA11x0 MCP (Multimedia Communications Port) driver.
*
* MCP read/write timeouts from Jordi Colomer, rehacked by rmk.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/mfd/mcp.h>
#include <mach/hardware.h>
#include <asm/mach-types.h>
#include <mach/mcp.h>
#define DRIVER_NAME "sa11x0-mcp"
struct mcp_sa11x0 {
void __iomem *base0;
void __iomem *base1;
u32 mccr0;
u32 mccr1;
};
/* Register offsets */
#define MCCR0(m) ((m)->base0 + 0x00)
#define MCDR0(m) ((m)->base0 + 0x08)
#define MCDR1(m) ((m)->base0 + 0x0c)
#define MCDR2(m) ((m)->base0 + 0x10)
#define MCSR(m) ((m)->base0 + 0x18)
#define MCCR1(m) ((m)->base1 + 0x00)
#define priv(mcp) ((struct mcp_sa11x0 *)mcp_priv(mcp))
static void
mcp_sa11x0_set_telecom_divisor(struct mcp *mcp, unsigned int divisor)
{
struct mcp_sa11x0 *m = priv(mcp);
divisor /= 32;
m->mccr0 &= ~0x00007f00;
m->mccr0 |= divisor << 8;
writel_relaxed(m->mccr0, MCCR0(m));
}
static void
mcp_sa11x0_set_audio_divisor(struct mcp *mcp, unsigned int divisor)
{
struct mcp_sa11x0 *m = priv(mcp);
divisor /= 32;
m->mccr0 &= ~0x0000007f;
m->mccr0 |= divisor;
writel_relaxed(m->mccr0, MCCR0(m));
}
/*
* Write data to the device. The bit should be set after 3 subframe
* times (each frame is 64 clocks). We wait a maximum of 6 subframes.
* We really should try doing something more productive while we
* wait.
*/
static void
mcp_sa11x0_write(struct mcp *mcp, unsigned int reg, unsigned int val)
{
struct mcp_sa11x0 *m = priv(mcp);
int ret = -ETIME;
int i;
writel_relaxed(reg << 17 | MCDR2_Wr | (val & 0xffff), MCDR2(m));
for (i = 0; i < 2; i++) {
udelay(mcp->rw_timeout);
if (readl_relaxed(MCSR(m)) & MCSR_CWC) {
ret = 0;
break;
}
}
if (ret < 0)
printk(KERN_WARNING "mcp: write timed out\n");
}
/*
* Read data from the device. The bit should be set after 3 subframe
* times (each frame is 64 clocks). We wait a maximum of 6 subframes.
* We really should try doing something more productive while we
* wait.
*/
static unsigned int
mcp_sa11x0_read(struct mcp *mcp, unsigned int reg)
{
struct mcp_sa11x0 *m = priv(mcp);
int ret = -ETIME;
int i;
writel_relaxed(reg << 17 | MCDR2_Rd, MCDR2(m));
for (i = 0; i < 2; i++) {
udelay(mcp->rw_timeout);
if (readl_relaxed(MCSR(m)) & MCSR_CRC) {
ret = readl_relaxed(MCDR2(m)) & 0xffff;
break;
}
}
if (ret < 0)
printk(KERN_WARNING "mcp: read timed out\n");
return ret;
}
static void mcp_sa11x0_enable(struct mcp *mcp)
{
struct mcp_sa11x0 *m = priv(mcp);
writel(-1, MCSR(m));
m->mccr0 |= MCCR0_MCE;
writel_relaxed(m->mccr0, MCCR0(m));
}
static void mcp_sa11x0_disable(struct mcp *mcp)
{
struct mcp_sa11x0 *m = priv(mcp);
m->mccr0 &= ~MCCR0_MCE;
writel_relaxed(m->mccr0, MCCR0(m));
}
/*
* Our methods.
*/
static struct mcp_ops mcp_sa11x0 = {
.set_telecom_divisor = mcp_sa11x0_set_telecom_divisor,
.set_audio_divisor = mcp_sa11x0_set_audio_divisor,
.reg_write = mcp_sa11x0_write,
.reg_read = mcp_sa11x0_read,
.enable = mcp_sa11x0_enable,
.disable = mcp_sa11x0_disable,
};
static int mcp_sa11x0_probe(struct platform_device *dev)
{
struct mcp_plat_data *data = dev->dev.platform_data;
struct resource *mem0, *mem1;
struct mcp_sa11x0 *m;
struct mcp *mcp;
int ret;
if (!data)
return -ENODEV;
mem0 = platform_get_resource(dev, IORESOURCE_MEM, 0);
mem1 = platform_get_resource(dev, IORESOURCE_MEM, 1);
if (!mem0 || !mem1)
return -ENXIO;
if (!request_mem_region(mem0->start, resource_size(mem0),
DRIVER_NAME)) {
ret = -EBUSY;
goto err_mem0;
}
if (!request_mem_region(mem1->start, resource_size(mem1),
DRIVER_NAME)) {
ret = -EBUSY;
goto err_mem1;
}
mcp = mcp_host_alloc(&dev->dev, sizeof(struct mcp_sa11x0));
if (!mcp) {
ret = -ENOMEM;
goto err_alloc;
}
mcp->owner = THIS_MODULE;
mcp->ops = &mcp_sa11x0;
mcp->sclk_rate = data->sclk_rate;
m = priv(mcp);
m->mccr0 = data->mccr0 | 0x7f7f;
m->mccr1 = data->mccr1;
m->base0 = ioremap(mem0->start, resource_size(mem0));
m->base1 = ioremap(mem1->start, resource_size(mem1));
if (!m->base0 || !m->base1) {
ret = -ENOMEM;
goto err_ioremap;
}
platform_set_drvdata(dev, mcp);
/*
* Initialise device. Note that we initially
* set the sampling rate to minimum.
*/
writel_relaxed(-1, MCSR(m));
writel_relaxed(m->mccr1, MCCR1(m));
writel_relaxed(m->mccr0, MCCR0(m));
/*
* Calculate the read/write timeout (us) from the bit clock
* rate. This is the period for 3 64-bit frames. Always
* round this time up.
*/
mcp->rw_timeout = (64 * 3 * 1000000 + mcp->sclk_rate - 1) /
mcp->sclk_rate;
ret = mcp_host_add(mcp, data->codec_pdata);
if (ret == 0)
return 0;
platform_set_drvdata(dev, NULL);
err_ioremap:
iounmap(m->base1);
iounmap(m->base0);
mcp_host_free(mcp);
err_alloc:
release_mem_region(mem1->start, resource_size(mem1));
err_mem1:
release_mem_region(mem0->start, resource_size(mem0));
err_mem0:
return ret;
}
static int mcp_sa11x0_remove(struct platform_device *dev)
{
struct mcp *mcp = platform_get_drvdata(dev);
struct mcp_sa11x0 *m = priv(mcp);
struct resource *mem0, *mem1;
if (m->mccr0 & MCCR0_MCE)
dev_warn(&dev->dev,
"device left active (missing disable call?)\n");
mem0 = platform_get_resource(dev, IORESOURCE_MEM, 0);
mem1 = platform_get_resource(dev, IORESOURCE_MEM, 1);
platform_set_drvdata(dev, NULL);
mcp_host_del(mcp);
iounmap(m->base1);
iounmap(m->base0);
mcp_host_free(mcp);
release_mem_region(mem1->start, resource_size(mem1));
release_mem_region(mem0->start, resource_size(mem0));
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int mcp_sa11x0_suspend(struct device *dev)
{
struct mcp_sa11x0 *m = priv(dev_get_drvdata(dev));
if (m->mccr0 & MCCR0_MCE)
dev_warn(dev, "device left active (missing disable call?)\n");
writel(m->mccr0 & ~MCCR0_MCE, MCCR0(m));
return 0;
}
static int mcp_sa11x0_resume(struct device *dev)
{
struct mcp_sa11x0 *m = priv(dev_get_drvdata(dev));
writel_relaxed(m->mccr1, MCCR1(m));
writel_relaxed(m->mccr0, MCCR0(m));
return 0;
}
#endif
static const struct dev_pm_ops mcp_sa11x0_pm_ops = {
#ifdef CONFIG_PM_SLEEP
.suspend = mcp_sa11x0_suspend,
.freeze = mcp_sa11x0_suspend,
.poweroff = mcp_sa11x0_suspend,
.resume_noirq = mcp_sa11x0_resume,
.thaw_noirq = mcp_sa11x0_resume,
.restore_noirq = mcp_sa11x0_resume,
#endif
};
static struct platform_driver mcp_sa11x0_driver = {
.probe = mcp_sa11x0_probe,
.remove = mcp_sa11x0_remove,
.driver = {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
.pm = &mcp_sa11x0_pm_ops,
},
};
/*
* This needs re-working
*/
module_platform_driver(mcp_sa11x0_driver);
MODULE_ALIAS("platform:" DRIVER_NAME);
MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
MODULE_DESCRIPTION("SA11x0 multimedia communications port driver");
MODULE_LICENSE("GPL");