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#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 */
  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        }
 129
 130        return 0;
 131}
 132
 133#endif
 134
 135static int
 136sa1100_pcmcia_set_timing(struct soc_pcmcia_socket *skt)
 137{
 138        unsigned long clk = clk_get_rate(skt->clk);
 139
 140        return sa1100_pcmcia_set_mecr(skt, clk / 1000);
 141}
 142
 143static int
 144sa1100_pcmcia_show_timing(struct soc_pcmcia_socket *skt, char *buf)
 145{
 146        struct soc_pcmcia_timing timing;
 147        unsigned int clock = clk_get_rate(skt->clk) / 1000;
 148        unsigned long mecr = MECR;
 149        char *p = buf;
 150
 151        soc_common_pcmcia_get_timing(skt, &timing);
 152
 153        p+=sprintf(p, "I/O      : %uns (%uns)\n", timing.io,
 154                   sa1100_pcmcia_cmd_time(clock, MECR_BSIO_GET(mecr, skt->nr)));
 155
 156        p+=sprintf(p, "attribute: %uns (%uns)\n", timing.attr,
 157                   sa1100_pcmcia_cmd_time(clock, MECR_BSA_GET(mecr, skt->nr)));
 158
 159        p+=sprintf(p, "common   : %uns (%uns)\n", timing.mem,
 160                   sa1100_pcmcia_cmd_time(clock, MECR_BSM_GET(mecr, skt->nr)));
 161
 162        return p - buf;
 163}
 164
 165static const char *skt_names[] = {
 166        "PCMCIA socket 0",
 167        "PCMCIA socket 1",
 168};
 169
 170#define SKT_DEV_INFO_SIZE(n) \
 171        (sizeof(struct skt_dev_info) + (n)*sizeof(struct soc_pcmcia_socket))
 172
 173int sa11xx_drv_pcmcia_add_one(struct soc_pcmcia_socket *skt)
 174{
 175        skt->res_skt.start = _PCMCIA(skt->nr);
 176        skt->res_skt.end = _PCMCIA(skt->nr) + PCMCIASp - 1;
 177        skt->res_skt.name = skt_names[skt->nr];
 178        skt->res_skt.flags = IORESOURCE_MEM;
 179
 180        skt->res_io.start = _PCMCIAIO(skt->nr);
 181        skt->res_io.end = _PCMCIAIO(skt->nr) + PCMCIAIOSp - 1;
 182        skt->res_io.name = "io";
 183        skt->res_io.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 184
 185        skt->res_mem.start = _PCMCIAMem(skt->nr);
 186        skt->res_mem.end = _PCMCIAMem(skt->nr) + PCMCIAMemSp - 1;
 187        skt->res_mem.name = "memory";
 188        skt->res_mem.flags = IORESOURCE_MEM;
 189
 190        skt->res_attr.start = _PCMCIAAttr(skt->nr);
 191        skt->res_attr.end = _PCMCIAAttr(skt->nr) + PCMCIAAttrSp - 1;
 192        skt->res_attr.name = "attribute";
 193        skt->res_attr.flags = IORESOURCE_MEM;
 194
 195        return soc_pcmcia_add_one(skt);
 196}
 197EXPORT_SYMBOL(sa11xx_drv_pcmcia_add_one);
 198
 199void sa11xx_drv_pcmcia_ops(struct pcmcia_low_level *ops)
 200{
 201        /*
 202         * set default MECR calculation if the board specific
 203         * code did not specify one...
 204         */
 205        if (!ops->get_timing)
 206                ops->get_timing = sa1100_pcmcia_default_mecr_timing;
 207
 208        /* Provide our SA11x0 specific timing routines. */
 209        ops->set_timing  = sa1100_pcmcia_set_timing;
 210        ops->show_timing = sa1100_pcmcia_show_timing;
 211#ifdef CONFIG_CPU_FREQ
 212        ops->frequency_change = sa1100_pcmcia_frequency_change;
 213#endif
 214}
 215EXPORT_SYMBOL(sa11xx_drv_pcmcia_ops);
 216
 217int sa11xx_drv_pcmcia_probe(struct device *dev, struct pcmcia_low_level *ops,
 218                            int first, int nr)
 219{
 220        struct skt_dev_info *sinfo;
 221        struct soc_pcmcia_socket *skt;
 222        int i, ret = 0;
 223        struct clk *clk;
 224
 225        clk = devm_clk_get(dev, NULL);
 226        if (IS_ERR(clk))
 227                return PTR_ERR(clk);
 228
 229        sa11xx_drv_pcmcia_ops(ops);
 230
 231        sinfo = devm_kzalloc(dev, SKT_DEV_INFO_SIZE(nr), GFP_KERNEL);
 232        if (!sinfo)
 233                return -ENOMEM;
 234
 235        sinfo->nskt = nr;
 236
 237        /* Initialize processor specific parameters */
 238        for (i = 0; i < nr; i++) {
 239                skt = &sinfo->skt[i];
 240
 241                skt->nr = first + i;
 242                skt->clk = clk;
 243                soc_pcmcia_init_one(skt, ops, dev);
 244
 245                ret = sa11xx_drv_pcmcia_add_one(skt);
 246                if (ret)
 247                        break;
 248        }
 249
 250        if (ret) {
 251                while (--i >= 0)
 252                        soc_pcmcia_remove_one(&sinfo->skt[i]);
 253        } else {
 254                dev_set_drvdata(dev, sinfo);
 255        }
 256
 257        return ret;
 258}
 259EXPORT_SYMBOL(sa11xx_drv_pcmcia_probe);
 260
 261MODULE_AUTHOR("John Dorsey <john+@cs.cmu.edu>");
 262MODULE_DESCRIPTION("Linux PCMCIA Card Services: SA-11xx core socket driver");
 263MODULE_LICENSE("Dual MPL/GPL");
 264