LXR linux/drivers/pcmcia/sa11xx

   1/*======================================================================
   2
   3    Device driver for the PCMCIA control functionality of StrongARM
   4    SA-1100 microprocessors.
   5
   6    The contents of this file are subject to the Mozilla Public
   7    License Version 1.1 (the "License"); you may not use this file
   8    except in compliance with the License. You may obtain a copy of
   9    the License at http://www.mozilla.org/MPL/
  10
  11    Software distributed under the License is distributed on an "AS
  12    IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
  13    implied. See the License for the specific language governing
  14    rights and limitations under the License.
  15
  16    The initial developer of the original code is John G. Dorsey
  17    <john+@cs.cmu.edu>.  Portions created by John G. Dorsey are
  18    Copyright (C) 1999 John G. Dorsey.  All Rights Reserved.
  19
  20    Alternatively, the contents of this file may be used under the
  21    terms of the GNU Public License version 2 (the "GPL"), in which
  22    case the provisions of the GPL are applicable instead of the
  23    above.  If you wish to allow the use of your version of this file
  24    only under the terms of the GPL and not to allow others to use
  25    your version of this file under the MPL, indicate your decision
  26    by deleting the provisions above and replace them with the notice
  27    and other provisions required by the GPL.  If you do not delete
  28    the provisions above, a recipient may use your version of this
  29    file under either the MPL or the GPL.
  30
  31======================================================================*/
  32
  33#include <linux/module.h>
  34#include <linux/init.h>
  35#include <linux/cpufreq.h>
  36#include <linux/ioport.h>
  37#include <linux/kernel.h>
  38#include <linux/spinlock.h>
  39
  40#include <mach/hardware.h>
  41#include <asm/io.h>
  42#include <asm/irq.h>
  43#include <asm/system.h>
  44
  45#include "soc_common.h"
  46#include "sa11xx_base.h"
  47
  48
  49/*
  50 * sa1100_pcmcia_default_mecr_timing
  51 * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  52 *
  53 * Calculate MECR clock wait states for given CPU clock
  54 * speed and command wait state. This function can be over-
  55 * written by a board specific version.
  56 *
  57 * The default is to simply calculate the BS values as specified in
  58 * the INTEL SA1100 development manual
  59 * "Expansion Memory (PCMCIA) Configuration Register (MECR)"
  60 * that's section 10.2.5 in _my_ version of the manual ;)
  61 */
  62static unsigned int
  63sa1100_pcmcia_default_mecr_timing(struct soc_pcmcia_socket *skt,
  64                                  unsigned int cpu_speed,
  65                                  unsigned int cmd_time)
  66{
  67        return sa1100_pcmcia_mecr_bs(cmd_time, cpu_speed);
  68}
  69
  70/* sa1100_pcmcia_set_mecr()
  71 * ^^^^^^^^^^^^^^^^^^^^^^^^
  72 *
  73 * set MECR value for socket <sock> based on this sockets
  74 * io, mem and attribute space access speed.
  75 * Call board specific BS value calculation to allow boards
  76 * to tweak the BS values.
  77 */
  78static int
  79sa1100_pcmcia_set_mecr(struct soc_pcmcia_socket *skt, unsigned int cpu_clock)
  80{
  81        struct soc_pcmcia_timing timing;
  82        u32 mecr, old_mecr;
  83        unsigned long flags;
  84        unsigned int bs_io, bs_mem, bs_attr;
  85
  86        soc_common_pcmcia_get_timing(skt, &timing);
  87
  88        bs_io = skt->ops->get_timing(skt, cpu_clock, timing.io);
  89        bs_mem = skt->ops->get_timing(skt, cpu_clock, timing.mem);
  90        bs_attr = skt->ops->get_timing(skt, cpu_clock, timing.attr);
  91
  92        local_irq_save(flags);
  93
  94        old_mecr = mecr = MECR;
  95        MECR_FAST_SET(mecr, skt->nr, 0);
  96        MECR_BSIO_SET(mecr, skt->nr, bs_io);
  97        MECR_BSA_SET(mecr, skt->nr, bs_attr);
  98        MECR_BSM_SET(mecr, skt->nr, bs_mem);
  99        if (old_mecr != mecr)
 100                MECR = mecr;
 101
 102        local_irq_restore(flags);
 103
 104        debug(skt, 2, "FAST %X  BSM %X  BSA %X  BSIO %X\n",
 105              MECR_FAST_GET(mecr, skt->nr),
 106              MECR_BSM_GET(mecr, skt->nr), MECR_BSA_GET(mecr, skt->nr),
 107              MECR_BSIO_GET(mecr, skt->nr));
 108
 109        return 0;
 110}
 111
 112#ifdef CONFIG_CPU_FREQ
 113static int
 114sa1100_pcmcia_frequency_change(struct soc_pcmcia_socket *skt,
 115                               unsigned long val,
 116                               struct cpufreq_freqs *freqs)
 117{
 118        switch (val) {
 119        case CPUFREQ_PRECHANGE:
 120                if (freqs->new > freqs->old)
 121                        sa1100_pcmcia_set_mecr(skt, freqs->new);
 122                break;
 123
 124        case CPUFREQ_POSTCHANGE:
 125                if (freqs->new < freqs->old)
 126                        sa1100_pcmcia_set_mecr(skt, freqs->new);
 127                break;
 128        case CPUFREQ_RESUMECHANGE:
 129                sa1100_pcmcia_set_mecr(skt, freqs->new);
 130                break;
 131        }
 132
 133        return 0;
 134}
 135
 136#endif
 137
 138static int
 139sa1100_pcmcia_set_timing(struct soc_pcmcia_socket *skt)
 140{
 141        return sa1100_pcmcia_set_mecr(skt, cpufreq_get(0));
 142}
 143
 144static int
 145sa1100_pcmcia_show_timing(struct soc_pcmcia_socket *skt, char *buf)
 146{
 147        struct soc_pcmcia_timing timing;
 148        unsigned int clock = cpufreq_get(0);
 149        unsigned long mecr = MECR;
 150        char *p = buf;
 151
 152        soc_common_pcmcia_get_timing(skt, &timing);
 153
 154        p+=sprintf(p, "I/O      : %u (%u)\n", timing.io,
 155                   sa1100_pcmcia_cmd_time(clock, MECR_BSIO_GET(mecr, skt->nr)));
 156
 157        p+=sprintf(p, "attribute: %u (%u)\n", timing.attr,
 158                   sa1100_pcmcia_cmd_time(clock, MECR_BSA_GET(mecr, skt->nr)));
 159
 160        p+=sprintf(p, "common   : %u (%u)\n", timing.mem,
 161                   sa1100_pcmcia_cmd_time(clock, MECR_BSM_GET(mecr, skt->nr)));
 162
 163        return p - buf;
 164}
 165
 166int sa11xx_drv_pcmcia_probe(struct device *dev, struct pcmcia_low_level *ops,
 167                            int first, int nr)
 168{
 169        /*
 170         * set default MECR calculation if the board specific
 171         * code did not specify one...
 172         */
 173        if (!ops->get_timing)
 174                ops->get_timing = sa1100_pcmcia_default_mecr_timing;
 175
 176        /* Provide our SA11x0 specific timing routines. */
 177        ops->set_timing  = sa1100_pcmcia_set_timing;
 178        ops->show_timing = sa1100_pcmcia_show_timing;
 179#ifdef CONFIG_CPU_FREQ
 180        ops->frequency_change = sa1100_pcmcia_frequency_change;
 181#endif
 182
 183        return soc_common_drv_pcmcia_probe(dev, ops, first, nr);
 184}
 185EXPORT_SYMBOL(sa11xx_drv_pcmcia_probe);
 186
 187static int __init sa11xx_pcmcia_init(void)
 188{
 189        return 0;
 190}
 191fs_initcall(sa11xx_pcmcia_init);
 192
 193static void __exit sa11xx_pcmcia_exit(void) {}
 194
 195module_exit(sa11xx_pcmcia_exit);
 196
 197MODULE_AUTHOR("John Dorsey <john+@cs.cmu.edu>");
 198MODULE_DESCRIPTION("Linux PCMCIA Card Services: SA-11xx core socket driver");
 199MODULE_LICENSE("Dual MPL/GPL");
 200