drivers/pcmcia/sa11xx_base.c

   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 #include <linux/io.h>
  40
  41 #include <mach/hardware.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  */
  62 static unsigned int
  63 sa1100_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  */
  78 static int
  79 sa1100_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
 113 static int
 114 sa1100_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
 138 static int
 139 sa1100_pcmcia_set_timing(struct soc_pcmcia_socket *skt)
 140 {
 141         return sa1100_pcmcia_set_mecr(skt, cpufreq_get(0));
 142 }
 143
 144 static int
 145 sa1100_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
 166 static const char *skt_names[] = {
 167         "PCMCIA socket 0",
 168         "PCMCIA socket 1",
 169 };
 170
 171 #define SKT_DEV_INFO_SIZE(n) \
 172         (sizeof(struct skt_dev_info) + (n)*sizeof(struct soc_pcmcia_socket))
 173
 174 int sa11xx_drv_pcmcia_probe(struct device *dev, struct pcmcia_low_level *ops,
 175                             int first, int nr)
 176 {
 177         struct skt_dev_info *sinfo;
 178         struct soc_pcmcia_socket *skt;
 179         int i;
 180
 181         sinfo = kzalloc(SKT_DEV_INFO_SIZE(nr), GFP_KERNEL);
 182         if (!sinfo)
 183                 return -ENOMEM;
 184
 185         sinfo->nskt = nr;
 186
 187         /* Initiliaze processor specific parameters */
 188         for (i = 0; i < nr; i++) {
 189                 skt = &sinfo->skt[i];
 190
 191                 skt->nr         = first + i;
 192                 skt->irq        = NO_IRQ;
 193
 194                 skt->res_skt.start      = _PCMCIA(skt->nr);
 195                 skt->res_skt.end        = _PCMCIA(skt->nr) + PCMCIASp - 1;
 196                 skt->res_skt.name       = skt_names[skt->nr];
 197                 skt->res_skt.flags      = IORESOURCE_MEM;
 198
 199                 skt->res_io.start       = _PCMCIAIO(skt->nr);
 200                 skt->res_io.end         = _PCMCIAIO(skt->nr) + PCMCIAIOSp - 1;
 201                 skt->res_io.name        = "io";
 202                 skt->res_io.flags       = IORESOURCE_MEM | IORESOURCE_BUSY;
 203
 204                 skt->res_mem.start      = _PCMCIAMem(skt->nr);
 205                 skt->res_mem.end        = _PCMCIAMem(skt->nr) + PCMCIAMemSp - 1;
 206                 skt->res_mem.name       = "memory";
 207                 skt->res_mem.flags      = IORESOURCE_MEM;
 208
 209                 skt->res_attr.start     = _PCMCIAAttr(skt->nr);
 210                 skt->res_attr.end       = _PCMCIAAttr(skt->nr) + PCMCIAAttrSp - 1;
 211                 skt->res_attr.name      = "attribute";
 212                 skt->res_attr.flags     = IORESOURCE_MEM;
 213         }
 214
 215         /*
 216          * set default MECR calculation if the board specific
 217          * code did not specify one...
 218          */
 219         if (!ops->get_timing)
 220                 ops->get_timing = sa1100_pcmcia_default_mecr_timing;
 221
 222         /* Provide our SA11x0 specific timing routines. */
 223         ops->set_timing  = sa1100_pcmcia_set_timing;
 224         ops->show_timing = sa1100_pcmcia_show_timing;
 225 #ifdef CONFIG_CPU_FREQ
 226         ops->frequency_change = sa1100_pcmcia_frequency_change;
 227 #endif
 228
 229         return soc_common_drv_pcmcia_probe(dev, ops, sinfo);
 230 }
 231 EXPORT_SYMBOL(sa11xx_drv_pcmcia_probe);
 232
 233 static int __init sa11xx_pcmcia_init(void)
 234 {
 235         return 0;
 236 }
 237 fs_initcall(sa11xx_pcmcia_init);
 238
 239 static void __exit sa11xx_pcmcia_exit(void) {}
 240
 241 module_exit(sa11xx_pcmcia_exit);
 242
 243 MODULE_AUTHOR("John Dorsey <john+@cs.cmu.edu>");
 244 MODULE_DESCRIPTION("Linux PCMCIA Card Services: SA-11xx core socket driver");
 245 MODULE_LICENSE("Dual MPL/GPL");