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linux-next/drivers/pcmcia/sa11xx_base.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

270 lines
7.4 KiB
C

/*======================================================================
Device driver for the PCMCIA control functionality of StrongARM
SA-1100 microprocessors.
The contents of this file are subject to the Mozilla Public
License Version 1.1 (the "License"); you may not use this file
except in compliance with the License. You may obtain a copy of
the License at http://www.mozilla.org/MPL/
Software distributed under the License is distributed on an "AS
IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
implied. See the License for the specific language governing
rights and limitations under the License.
The initial developer of the original code is John G. Dorsey
<john+@cs.cmu.edu>. Portions created by John G. Dorsey are
Copyright (C) 1999 John G. Dorsey. All Rights Reserved.
Alternatively, the contents of this file may be used under the
terms of the GNU Public License version 2 (the "GPL"), in which
case the provisions of the GPL are applicable instead of the
above. If you wish to allow the use of your version of this file
only under the terms of the GPL and not to allow others to use
your version of this file under the MPL, indicate your decision
by deleting the provisions above and replace them with the notice
and other provisions required by the GPL. If you do not delete
the provisions above, a recipient may use your version of this
file under either the MPL or the GPL.
======================================================================*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/cpufreq.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <mach/hardware.h>
#include <asm/irq.h>
#include "soc_common.h"
#include "sa11xx_base.h"
/*
* sa1100_pcmcia_default_mecr_timing
* ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
*
* Calculate MECR clock wait states for given CPU clock
* speed and command wait state. This function can be over-
* written by a board specific version.
*
* The default is to simply calculate the BS values as specified in
* the INTEL SA1100 development manual
* "Expansion Memory (PCMCIA) Configuration Register (MECR)"
* that's section 10.2.5 in _my_ version of the manual ;)
*/
static unsigned int
sa1100_pcmcia_default_mecr_timing(struct soc_pcmcia_socket *skt,
unsigned int cpu_speed,
unsigned int cmd_time)
{
return sa1100_pcmcia_mecr_bs(cmd_time, cpu_speed);
}
/* sa1100_pcmcia_set_mecr()
* ^^^^^^^^^^^^^^^^^^^^^^^^
*
* set MECR value for socket <sock> based on this sockets
* io, mem and attribute space access speed.
* Call board specific BS value calculation to allow boards
* to tweak the BS values.
*/
static int
sa1100_pcmcia_set_mecr(struct soc_pcmcia_socket *skt, unsigned int cpu_clock)
{
struct soc_pcmcia_timing timing;
u32 mecr, old_mecr;
unsigned long flags;
unsigned int bs_io, bs_mem, bs_attr;
soc_common_pcmcia_get_timing(skt, &timing);
bs_io = skt->ops->get_timing(skt, cpu_clock, timing.io);
bs_mem = skt->ops->get_timing(skt, cpu_clock, timing.mem);
bs_attr = skt->ops->get_timing(skt, cpu_clock, timing.attr);
local_irq_save(flags);
old_mecr = mecr = MECR;
MECR_FAST_SET(mecr, skt->nr, 0);
MECR_BSIO_SET(mecr, skt->nr, bs_io);
MECR_BSA_SET(mecr, skt->nr, bs_attr);
MECR_BSM_SET(mecr, skt->nr, bs_mem);
if (old_mecr != mecr)
MECR = mecr;
local_irq_restore(flags);
debug(skt, 2, "FAST %X BSM %X BSA %X BSIO %X\n",
MECR_FAST_GET(mecr, skt->nr),
MECR_BSM_GET(mecr, skt->nr), MECR_BSA_GET(mecr, skt->nr),
MECR_BSIO_GET(mecr, skt->nr));
return 0;
}
#ifdef CONFIG_CPU_FREQ
static int
sa1100_pcmcia_frequency_change(struct soc_pcmcia_socket *skt,
unsigned long val,
struct cpufreq_freqs *freqs)
{
switch (val) {
case CPUFREQ_PRECHANGE:
if (freqs->new > freqs->old)
sa1100_pcmcia_set_mecr(skt, freqs->new);
break;
case CPUFREQ_POSTCHANGE:
if (freqs->new < freqs->old)
sa1100_pcmcia_set_mecr(skt, freqs->new);
break;
case CPUFREQ_RESUMECHANGE:
sa1100_pcmcia_set_mecr(skt, freqs->new);
break;
}
return 0;
}
#endif
static int
sa1100_pcmcia_set_timing(struct soc_pcmcia_socket *skt)
{
return sa1100_pcmcia_set_mecr(skt, cpufreq_get(0));
}
static int
sa1100_pcmcia_show_timing(struct soc_pcmcia_socket *skt, char *buf)
{
struct soc_pcmcia_timing timing;
unsigned int clock = cpufreq_get(0);
unsigned long mecr = MECR;
char *p = buf;
soc_common_pcmcia_get_timing(skt, &timing);
p+=sprintf(p, "I/O : %u (%u)\n", timing.io,
sa1100_pcmcia_cmd_time(clock, MECR_BSIO_GET(mecr, skt->nr)));
p+=sprintf(p, "attribute: %u (%u)\n", timing.attr,
sa1100_pcmcia_cmd_time(clock, MECR_BSA_GET(mecr, skt->nr)));
p+=sprintf(p, "common : %u (%u)\n", timing.mem,
sa1100_pcmcia_cmd_time(clock, MECR_BSM_GET(mecr, skt->nr)));
return p - buf;
}
static const char *skt_names[] = {
"PCMCIA socket 0",
"PCMCIA socket 1",
};
#define SKT_DEV_INFO_SIZE(n) \
(sizeof(struct skt_dev_info) + (n)*sizeof(struct soc_pcmcia_socket))
int sa11xx_drv_pcmcia_add_one(struct soc_pcmcia_socket *skt)
{
skt->res_skt.start = _PCMCIA(skt->nr);
skt->res_skt.end = _PCMCIA(skt->nr) + PCMCIASp - 1;
skt->res_skt.name = skt_names[skt->nr];
skt->res_skt.flags = IORESOURCE_MEM;
skt->res_io.start = _PCMCIAIO(skt->nr);
skt->res_io.end = _PCMCIAIO(skt->nr) + PCMCIAIOSp - 1;
skt->res_io.name = "io";
skt->res_io.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
skt->res_mem.start = _PCMCIAMem(skt->nr);
skt->res_mem.end = _PCMCIAMem(skt->nr) + PCMCIAMemSp - 1;
skt->res_mem.name = "memory";
skt->res_mem.flags = IORESOURCE_MEM;
skt->res_attr.start = _PCMCIAAttr(skt->nr);
skt->res_attr.end = _PCMCIAAttr(skt->nr) + PCMCIAAttrSp - 1;
skt->res_attr.name = "attribute";
skt->res_attr.flags = IORESOURCE_MEM;
return soc_pcmcia_add_one(skt);
}
EXPORT_SYMBOL(sa11xx_drv_pcmcia_add_one);
void sa11xx_drv_pcmcia_ops(struct pcmcia_low_level *ops)
{
/*
* set default MECR calculation if the board specific
* code did not specify one...
*/
if (!ops->get_timing)
ops->get_timing = sa1100_pcmcia_default_mecr_timing;
/* Provide our SA11x0 specific timing routines. */
ops->set_timing = sa1100_pcmcia_set_timing;
ops->show_timing = sa1100_pcmcia_show_timing;
#ifdef CONFIG_CPU_FREQ
ops->frequency_change = sa1100_pcmcia_frequency_change;
#endif
}
EXPORT_SYMBOL(sa11xx_drv_pcmcia_ops);
int sa11xx_drv_pcmcia_probe(struct device *dev, struct pcmcia_low_level *ops,
int first, int nr)
{
struct skt_dev_info *sinfo;
struct soc_pcmcia_socket *skt;
int i, ret = 0;
sa11xx_drv_pcmcia_ops(ops);
sinfo = kzalloc(SKT_DEV_INFO_SIZE(nr), GFP_KERNEL);
if (!sinfo)
return -ENOMEM;
sinfo->nskt = nr;
/* Initialize processor specific parameters */
for (i = 0; i < nr; i++) {
skt = &sinfo->skt[i];
skt->nr = first + i;
soc_pcmcia_init_one(skt, ops, dev);
ret = sa11xx_drv_pcmcia_add_one(skt);
if (ret)
break;
}
if (ret) {
while (--i >= 0)
soc_pcmcia_remove_one(&sinfo->skt[i]);
kfree(sinfo);
} else {
dev_set_drvdata(dev, sinfo);
}
return ret;
}
EXPORT_SYMBOL(sa11xx_drv_pcmcia_probe);
static int __init sa11xx_pcmcia_init(void)
{
return 0;
}
fs_initcall(sa11xx_pcmcia_init);
static void __exit sa11xx_pcmcia_exit(void) {}
module_exit(sa11xx_pcmcia_exit);
MODULE_AUTHOR("John Dorsey <john+@cs.cmu.edu>");
MODULE_DESCRIPTION("Linux PCMCIA Card Services: SA-11xx core socket driver");
MODULE_LICENSE("Dual MPL/GPL");