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 #include <linux/slab.h>
  41
  42 #include <mach/hardware.h>
  43 #include <asm/irq.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_add_one(struct soc_pcmcia_socket *skt)
 175 {
 176         skt->res_skt.start = _PCMCIA(skt->nr);
 177         skt->res_skt.end = _PCMCIA(skt->nr) + PCMCIASp - 1;
 178         skt->res_skt.name = skt_names[skt->nr];
 179         skt->res_skt.flags = IORESOURCE_MEM;
 180
 181         skt->res_io.start = _PCMCIAIO(skt->nr);
 182         skt->res_io.end = _PCMCIAIO(skt->nr) + PCMCIAIOSp - 1;
 183         skt->res_io.name = "io";
 184         skt->res_io.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 185
 186         skt->res_mem.start = _PCMCIAMem(skt->nr);
 187         skt->res_mem.end = _PCMCIAMem(skt->nr) + PCMCIAMemSp - 1;
 188         skt->res_mem.name = "memory";
 189         skt->res_mem.flags = IORESOURCE_MEM;
 190
 191         skt->res_attr.start = _PCMCIAAttr(skt->nr);
 192         skt->res_attr.end = _PCMCIAAttr(skt->nr) + PCMCIAAttrSp - 1;
 193         skt->res_attr.name = "attribute";
 194         skt->res_attr.flags = IORESOURCE_MEM;
 195
 196         return soc_pcmcia_add_one(skt);
 197 }
 198 EXPORT_SYMBOL(sa11xx_drv_pcmcia_add_one);
 199
 200 void sa11xx_drv_pcmcia_ops(struct pcmcia_low_level *ops)
 201 {
 202         /*
 203          * set default MECR calculation if the board specific
 204          * code did not specify one...
 205          */
 206         if (!ops->get_timing)
 207                 ops->get_timing = sa1100_pcmcia_default_mecr_timing;
 208
 209         /* Provide our SA11x0 specific timing routines. */
 210         ops->set_timing  = sa1100_pcmcia_set_timing;
 211         ops->show_timing = sa1100_pcmcia_show_timing;
 212 #ifdef CONFIG_CPU_FREQ
 213         ops->frequency_change = sa1100_pcmcia_frequency_change;
 214 #endif
 215 }
 216 EXPORT_SYMBOL(sa11xx_drv_pcmcia_ops);
 217
 218 int sa11xx_drv_pcmcia_probe(struct device *dev, struct pcmcia_low_level *ops,
 219                             int first, int nr)
 220 {
 221         struct skt_dev_info *sinfo;
 222         struct soc_pcmcia_socket *skt;
 223         int i, ret = 0;
 224
 225         sa11xx_drv_pcmcia_ops(ops);
 226
 227         sinfo = kzalloc(SKT_DEV_INFO_SIZE(nr), GFP_KERNEL);
 228         if (!sinfo)
 229                 return -ENOMEM;
 230
 231         sinfo->nskt = nr;
 232
 233         /* Initialize processor specific parameters */
 234         for (i = 0; i < nr; i++) {
 235                 skt = &sinfo->skt[i];
 236
 237                 skt->nr = first + i;
 238                 soc_pcmcia_init_one(skt, ops, dev);
 239
 240                 ret = sa11xx_drv_pcmcia_add_one(skt);
 241                 if (ret)
 242                         break;
 243         }
 244
 245         if (ret) {
 246                 while (--i >= 0)
 247                         soc_pcmcia_remove_one(&sinfo->skt[i]);
 248                 kfree(sinfo);
 249         } else {
 250                 dev_set_drvdata(dev, sinfo);
 251         }
 252
 253         return ret;
 254 }
 255 EXPORT_SYMBOL(sa11xx_drv_pcmcia_probe);
 256
 257 static int __init sa11xx_pcmcia_init(void)
 258 {
 259         return 0;
 260 }
 261 fs_initcall(sa11xx_pcmcia_init);
 262
 263 static void __exit sa11xx_pcmcia_exit(void) {}
 264
 265 module_exit(sa11xx_pcmcia_exit);
 266
 267 MODULE_AUTHOR("John Dorsey <john+@cs.cmu.edu>");
 268 MODULE_DESCRIPTION("Linux PCMCIA Card Services: SA-11xx core socket driver");
 269 MODULE_LICENSE("Dual MPL/GPL");