drivers/pcmcia/pxa2xx_base.c

   1 /*======================================================================
   2
   3   Device driver for the PCMCIA control functionality of PXA2xx
   4   microprocessors.
   5
   6     The contents of this file may be used under the
   7     terms of the GNU Public License version 2 (the "GPL")
   8
   9     (c) Ian Molton (spyro@f2s.com) 2003
  10     (c) Stefan Eletzhofer (stefan.eletzhofer@inquant.de) 2003,4
  11
  12     derived from sa11xx_base.c
  13
  14      Portions created by John G. Dorsey are
  15      Copyright (C) 1999 John G. Dorsey.
  16
  17   ======================================================================*/
  18
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/cpufreq.h>
  22 #include <linux/ioport.h>
  23 #include <linux/kernel.h>
  24 #include <linux/spinlock.h>
  25 #include <linux/platform_device.h>
  26
  27 #include <mach/hardware.h>
  28 #include <asm/io.h>
  29 #include <asm/irq.h>
  30 #include <asm/system.h>
  31 #include <mach/pxa2xx-regs.h>
  32 #include <asm/mach-types.h>
  33
  34 #include <pcmcia/cs_types.h>
  35 #include <pcmcia/ss.h>
  36 #include <pcmcia/cistpl.h>
  37
  38 #include "soc_common.h"
  39 #include "pxa2xx_base.h"
  40
  41 /*
  42  * Personal Computer Memory Card International Association (PCMCIA) sockets
  43  */
  44
  45 #define PCMCIAPrtSp     0x04000000      /* PCMCIA Partition Space [byte]   */
  46 #define PCMCIASp        (4*PCMCIAPrtSp) /* PCMCIA Space [byte]             */
  47 #define PCMCIAIOSp      PCMCIAPrtSp     /* PCMCIA I/O Space [byte]         */
  48 #define PCMCIAAttrSp    PCMCIAPrtSp     /* PCMCIA Attribute Space [byte]   */
  49 #define PCMCIAMemSp     PCMCIAPrtSp     /* PCMCIA Memory Space [byte]      */
  50
  51 #define PCMCIA0Sp       PCMCIASp        /* PCMCIA 0 Space [byte]           */
  52 #define PCMCIA0IOSp     PCMCIAIOSp      /* PCMCIA 0 I/O Space [byte]       */
  53 #define PCMCIA0AttrSp   PCMCIAAttrSp    /* PCMCIA 0 Attribute Space [byte] */
  54 #define PCMCIA0MemSp    PCMCIAMemSp     /* PCMCIA 0 Memory Space [byte]    */
  55
  56 #define PCMCIA1Sp       PCMCIASp        /* PCMCIA 1 Space [byte]           */
  57 #define PCMCIA1IOSp     PCMCIAIOSp      /* PCMCIA 1 I/O Space [byte]       */
  58 #define PCMCIA1AttrSp   PCMCIAAttrSp    /* PCMCIA 1 Attribute Space [byte] */
  59 #define PCMCIA1MemSp    PCMCIAMemSp     /* PCMCIA 1 Memory Space [byte]    */
  60
  61 #define _PCMCIA(Nb)                     /* PCMCIA [0..1]                   */ \
  62                         (0x20000000 + (Nb) * PCMCIASp)
  63 #define _PCMCIAIO(Nb)   _PCMCIA(Nb)     /* PCMCIA I/O [0..1]               */
  64 #define _PCMCIAAttr(Nb)                 /* PCMCIA Attribute [0..1]         */ \
  65                         (_PCMCIA(Nb) + 2 * PCMCIAPrtSp)
  66 #define _PCMCIAMem(Nb)                  /* PCMCIA Memory [0..1]            */ \
  67                         (_PCMCIA(Nb) + 3 * PCMCIAPrtSp)
  68
  69 #define _PCMCIA0        _PCMCIA(0)      /* PCMCIA 0                        */
  70 #define _PCMCIA0IO      _PCMCIAIO(0)    /* PCMCIA 0 I/O                    */
  71 #define _PCMCIA0Attr    _PCMCIAAttr(0)  /* PCMCIA 0 Attribute              */
  72 #define _PCMCIA0Mem     _PCMCIAMem(0)   /* PCMCIA 0 Memory                 */
  73
  74 #define _PCMCIA1        _PCMCIA(1)      /* PCMCIA 1                        */
  75 #define _PCMCIA1IO      _PCMCIAIO(1)    /* PCMCIA 1 I/O                    */
  76 #define _PCMCIA1Attr    _PCMCIAAttr(1)  /* PCMCIA 1 Attribute              */
  77 #define _PCMCIA1Mem     _PCMCIAMem(1)   /* PCMCIA 1 Memory                 */
  78
  79
  80 #define MCXX_SETUP_MASK     (0x7f)
  81 #define MCXX_ASST_MASK      (0x1f)
  82 #define MCXX_HOLD_MASK      (0x3f)
  83 #define MCXX_SETUP_SHIFT    (0)
  84 #define MCXX_ASST_SHIFT     (7)
  85 #define MCXX_HOLD_SHIFT     (14)
  86
  87 static inline u_int pxa2xx_mcxx_hold(u_int pcmcia_cycle_ns,
  88                                      u_int mem_clk_10khz)
  89 {
  90         u_int code = pcmcia_cycle_ns * mem_clk_10khz;
  91         return (code / 300000) + ((code % 300000) ? 1 : 0) - 1;
  92 }
  93
  94 static inline u_int pxa2xx_mcxx_asst(u_int pcmcia_cycle_ns,
  95                                      u_int mem_clk_10khz)
  96 {
  97         u_int code = pcmcia_cycle_ns * mem_clk_10khz;
  98         return (code / 300000) + ((code % 300000) ? 1 : 0) + 1;
  99 }
 100
 101 static inline u_int pxa2xx_mcxx_setup(u_int pcmcia_cycle_ns,
 102                                       u_int mem_clk_10khz)
 103 {
 104         u_int code = pcmcia_cycle_ns * mem_clk_10khz;
 105         return (code / 100000) + ((code % 100000) ? 1 : 0) - 1;
 106 }
 107
 108 /* This function returns the (approximate) command assertion period, in
 109  * nanoseconds, for a given CPU clock frequency and MCXX_ASST value:
 110  */
 111 static inline u_int pxa2xx_pcmcia_cmd_time(u_int mem_clk_10khz,
 112                                            u_int pcmcia_mcxx_asst)
 113 {
 114         return (300000 * (pcmcia_mcxx_asst + 1) / mem_clk_10khz);
 115 }
 116
 117 static int pxa2xx_pcmcia_set_mcmem( int sock, int speed, int clock )
 118 {
 119         MCMEM(sock) = ((pxa2xx_mcxx_setup(speed, clock)
 120                 & MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
 121                 | ((pxa2xx_mcxx_asst(speed, clock)
 122                 & MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
 123                 | ((pxa2xx_mcxx_hold(speed, clock)
 124                 & MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
 125
 126         return 0;
 127 }
 128
 129 static int pxa2xx_pcmcia_set_mcio( int sock, int speed, int clock )
 130 {
 131         MCIO(sock) = ((pxa2xx_mcxx_setup(speed, clock)
 132                 & MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
 133                 | ((pxa2xx_mcxx_asst(speed, clock)
 134                 & MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
 135                 | ((pxa2xx_mcxx_hold(speed, clock)
 136                 & MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
 137
 138         return 0;
 139 }
 140
 141 static int pxa2xx_pcmcia_set_mcatt( int sock, int speed, int clock )
 142 {
 143         MCATT(sock) = ((pxa2xx_mcxx_setup(speed, clock)
 144                 & MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
 145                 | ((pxa2xx_mcxx_asst(speed, clock)
 146                 & MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
 147                 | ((pxa2xx_mcxx_hold(speed, clock)
 148                 & MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
 149
 150         return 0;
 151 }
 152
 153 static int pxa2xx_pcmcia_set_mcxx(struct soc_pcmcia_socket *skt, unsigned int clk)
 154 {
 155         struct soc_pcmcia_timing timing;
 156         int sock = skt->nr;
 157
 158         soc_common_pcmcia_get_timing(skt, &timing);
 159
 160         pxa2xx_pcmcia_set_mcmem(sock, timing.mem, clk);
 161         pxa2xx_pcmcia_set_mcatt(sock, timing.attr, clk);
 162         pxa2xx_pcmcia_set_mcio(sock, timing.io, clk);
 163
 164         return 0;
 165 }
 166
 167 static int pxa2xx_pcmcia_set_timing(struct soc_pcmcia_socket *skt)
 168 {
 169         unsigned int clk = get_memclk_frequency_10khz();
 170         return pxa2xx_pcmcia_set_mcxx(skt, clk);
 171 }
 172
 173 #ifdef CONFIG_CPU_FREQ
 174
 175 static int
 176 pxa2xx_pcmcia_frequency_change(struct soc_pcmcia_socket *skt,
 177                                unsigned long val,
 178                                struct cpufreq_freqs *freqs)
 179 {
 180 #warning "it's not clear if this is right since the core CPU (N) clock has no effect on the memory (L) clock"
 181         switch (val) {
 182         case CPUFREQ_PRECHANGE:
 183                 if (freqs->new > freqs->old) {
 184                         debug(skt, 2, "new frequency %u.%uMHz > %u.%uMHz, "
 185                                "pre-updating\n",
 186                                freqs->new / 1000, (freqs->new / 100) % 10,
 187                                freqs->old / 1000, (freqs->old / 100) % 10);
 188                         pxa2xx_pcmcia_set_mcxx(skt, freqs->new);
 189                 }
 190                 break;
 191
 192         case CPUFREQ_POSTCHANGE:
 193                 if (freqs->new < freqs->old) {
 194                         debug(skt, 2, "new frequency %u.%uMHz < %u.%uMHz, "
 195                                "post-updating\n",
 196                                freqs->new / 1000, (freqs->new / 100) % 10,
 197                                freqs->old / 1000, (freqs->old / 100) % 10);
 198                         pxa2xx_pcmcia_set_mcxx(skt, freqs->new);
 199                 }
 200                 break;
 201         }
 202         return 0;
 203 }
 204 #endif
 205
 206 static void pxa2xx_configure_sockets(struct device *dev)
 207 {
 208         struct pcmcia_low_level *ops = dev->platform_data;
 209
 210         /*
 211          * We have at least one socket, so set MECR:CIT
 212          * (Card Is There)
 213          */
 214         MECR |= MECR_CIT;
 215
 216         /* Set MECR:NOS (Number Of Sockets) */
 217         if ((ops->first + ops->nr) > 1 || machine_is_viper())
 218                 MECR |= MECR_NOS;
 219         else
 220                 MECR &= ~MECR_NOS;
 221 }
 222
 223 static const char *skt_names[] = {
 224         "PCMCIA socket 0",
 225         "PCMCIA socket 1",
 226 };
 227
 228 #define SKT_DEV_INFO_SIZE(n) \
 229         (sizeof(struct skt_dev_info) + (n)*sizeof(struct soc_pcmcia_socket))
 230
 231 int pxa2xx_drv_pcmcia_add_one(struct soc_pcmcia_socket *skt)
 232 {
 233         skt->res_skt.start = _PCMCIA(skt->nr);
 234         skt->res_skt.end = _PCMCIA(skt->nr) + PCMCIASp - 1;
 235         skt->res_skt.name = skt_names[skt->nr];
 236         skt->res_skt.flags = IORESOURCE_MEM;
 237
 238         skt->res_io.start = _PCMCIAIO(skt->nr);
 239         skt->res_io.end = _PCMCIAIO(skt->nr) + PCMCIAIOSp - 1;
 240         skt->res_io.name = "io";
 241         skt->res_io.flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 242
 243         skt->res_mem.start = _PCMCIAMem(skt->nr);
 244         skt->res_mem.end = _PCMCIAMem(skt->nr) + PCMCIAMemSp - 1;
 245         skt->res_mem.name = "memory";
 246         skt->res_mem.flags = IORESOURCE_MEM;
 247
 248         skt->res_attr.start = _PCMCIAAttr(skt->nr);
 249         skt->res_attr.end = _PCMCIAAttr(skt->nr) + PCMCIAAttrSp - 1;
 250         skt->res_attr.name = "attribute";
 251         skt->res_attr.flags = IORESOURCE_MEM;
 252
 253         return soc_pcmcia_add_one(skt);
 254 }
 255
 256 void pxa2xx_drv_pcmcia_ops(struct pcmcia_low_level *ops)
 257 {
 258         /* Provide our PXA2xx specific timing routines. */
 259         ops->set_timing  = pxa2xx_pcmcia_set_timing;
 260 #ifdef CONFIG_CPU_FREQ
 261         ops->frequency_change = pxa2xx_pcmcia_frequency_change;
 262 #endif
 263 }
 264
 265 int __pxa2xx_drv_pcmcia_probe(struct device *dev)
 266 {
 267         int i, ret = 0;
 268         struct pcmcia_low_level *ops;
 269         struct skt_dev_info *sinfo;
 270         struct soc_pcmcia_socket *skt;
 271
 272         if (!dev || !dev->platform_data)
 273                 return -ENODEV;
 274
 275         ops = (struct pcmcia_low_level *)dev->platform_data;
 276
 277         pxa2xx_drv_pcmcia_ops(ops);
 278
 279         sinfo = kzalloc(SKT_DEV_INFO_SIZE(ops->nr), GFP_KERNEL);
 280         if (!sinfo)
 281                 return -ENOMEM;
 282
 283         sinfo->nskt = ops->nr;
 284
 285         /* Initialize processor specific parameters */
 286         for (i = 0; i < ops->nr; i++) {
 287                 skt = &sinfo->skt[i];
 288
 289                 skt->nr = ops->first + i;
 290                 skt->ops = ops;
 291                 skt->socket.owner = ops->owner;
 292                 skt->socket.dev.parent = dev;
 293                 skt->socket.pci_irq = NO_IRQ;
 294
 295                 ret = pxa2xx_drv_pcmcia_add_one(skt);
 296                 if (ret)
 297                         break;
 298         }
 299
 300         if (ret) {
 301                 while (--i >= 0)
 302                         soc_pcmcia_remove_one(&sinfo->skt[i]);
 303                 kfree(sinfo);
 304         } else {
 305                 pxa2xx_configure_sockets(dev);
 306                 dev_set_drvdata(dev, sinfo);
 307         }
 308
 309         return ret;
 310 }
 311 EXPORT_SYMBOL(__pxa2xx_drv_pcmcia_probe);
 312
 313
 314 static int pxa2xx_drv_pcmcia_probe(struct platform_device *dev)
 315 {
 316         return __pxa2xx_drv_pcmcia_probe(&dev->dev);
 317 }
 318
 319 static int pxa2xx_drv_pcmcia_remove(struct platform_device *dev)
 320 {
 321         struct skt_dev_info *sinfo = platform_get_drvdata(dev);
 322         int i;
 323
 324         platform_set_drvdata(dev, NULL);
 325
 326         for (i = 0; i < sinfo->nskt; i++)
 327                 soc_pcmcia_remove_one(&sinfo->skt[i]);
 328
 329         kfree(sinfo);
 330         return 0;
 331 }
 332
 333 static int pxa2xx_drv_pcmcia_suspend(struct device *dev)
 334 {
 335         return pcmcia_socket_dev_suspend(dev);
 336 }
 337
 338 static int pxa2xx_drv_pcmcia_resume(struct device *dev)
 339 {
 340         pxa2xx_configure_sockets(dev);
 341         return pcmcia_socket_dev_resume(dev);
 342 }
 343
 344 static struct dev_pm_ops  pxa2xx_drv_pcmcia_pm_ops = {
 345         .suspend        = pxa2xx_drv_pcmcia_suspend,
 346         .resume         = pxa2xx_drv_pcmcia_resume,
 347 };
 348
 349 static struct platform_driver pxa2xx_pcmcia_driver = {
 350         .probe          = pxa2xx_drv_pcmcia_probe,
 351         .remove         = pxa2xx_drv_pcmcia_remove,
 352         .driver         = {
 353                 .name   = "pxa2xx-pcmcia",
 354                 .owner  = THIS_MODULE,
 355                 .pm     = &pxa2xx_drv_pcmcia_pm_ops,
 356         },
 357 };
 358
 359 static int __init pxa2xx_pcmcia_init(void)
 360 {
 361         return platform_driver_register(&pxa2xx_pcmcia_driver);
 362 }
 363
 364 static void __exit pxa2xx_pcmcia_exit(void)
 365 {
 366         platform_driver_unregister(&pxa2xx_pcmcia_driver);
 367 }
 368
 369 fs_initcall(pxa2xx_pcmcia_init);
 370 module_exit(pxa2xx_pcmcia_exit);
 371
 372 MODULE_AUTHOR("Stefan Eletzhofer <stefan.eletzhofer@inquant.de> and Ian Molton <spyro@f2s.com>");
 373 MODULE_DESCRIPTION("Linux PCMCIA Card Services: PXA2xx core socket driver");
 374 MODULE_LICENSE("GPL");
 375 MODULE_ALIAS("platform:pxa2xx-pcmcia");