linux/drivers/pcmcia/pxa2xx_base.c
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   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/pxa-regs.h>
  32#include <mach/pxa2xx-regs.h>
  33#include <asm/mach-types.h>
  34
  35#include <pcmcia/cs_types.h>
  36#include <pcmcia/ss.h>
  37#include <pcmcia/cistpl.h>
  38
  39#include "soc_common.h"
  40#include "pxa2xx_base.h"
  41
  42
  43#define MCXX_SETUP_MASK     (0x7f)
  44#define MCXX_ASST_MASK      (0x1f)
  45#define MCXX_HOLD_MASK      (0x3f)
  46#define MCXX_SETUP_SHIFT    (0)
  47#define MCXX_ASST_SHIFT     (7)
  48#define MCXX_HOLD_SHIFT     (14)
  49
  50static inline u_int pxa2xx_mcxx_hold(u_int pcmcia_cycle_ns,
  51                                     u_int mem_clk_10khz)
  52{
  53        u_int code = pcmcia_cycle_ns * mem_clk_10khz;
  54        return (code / 300000) + ((code % 300000) ? 1 : 0) - 1;
  55}
  56
  57static inline u_int pxa2xx_mcxx_asst(u_int pcmcia_cycle_ns,
  58                                     u_int mem_clk_10khz)
  59{
  60        u_int code = pcmcia_cycle_ns * mem_clk_10khz;
  61        return (code / 300000) + ((code % 300000) ? 1 : 0) + 1;
  62}
  63
  64static inline u_int pxa2xx_mcxx_setup(u_int pcmcia_cycle_ns,
  65                                      u_int mem_clk_10khz)
  66{
  67        u_int code = pcmcia_cycle_ns * mem_clk_10khz;
  68        return (code / 100000) + ((code % 100000) ? 1 : 0) - 1;
  69}
  70
  71/* This function returns the (approximate) command assertion period, in
  72 * nanoseconds, for a given CPU clock frequency and MCXX_ASST value:
  73 */
  74static inline u_int pxa2xx_pcmcia_cmd_time(u_int mem_clk_10khz,
  75                                           u_int pcmcia_mcxx_asst)
  76{
  77        return (300000 * (pcmcia_mcxx_asst + 1) / mem_clk_10khz);
  78}
  79
  80static int pxa2xx_pcmcia_set_mcmem( int sock, int speed, int clock )
  81{
  82        MCMEM(sock) = ((pxa2xx_mcxx_setup(speed, clock)
  83                & MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
  84                | ((pxa2xx_mcxx_asst(speed, clock)
  85                & MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
  86                | ((pxa2xx_mcxx_hold(speed, clock)
  87                & MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
  88
  89        return 0;
  90}
  91
  92static int pxa2xx_pcmcia_set_mcio( int sock, int speed, int clock )
  93{
  94        MCIO(sock) = ((pxa2xx_mcxx_setup(speed, clock)
  95                & MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
  96                | ((pxa2xx_mcxx_asst(speed, clock)
  97                & MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
  98                | ((pxa2xx_mcxx_hold(speed, clock)
  99                & MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
 100
 101        return 0;
 102}
 103
 104static int pxa2xx_pcmcia_set_mcatt( int sock, int speed, int clock )
 105{
 106        MCATT(sock) = ((pxa2xx_mcxx_setup(speed, clock)
 107                & MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
 108                | ((pxa2xx_mcxx_asst(speed, clock)
 109                & MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
 110                | ((pxa2xx_mcxx_hold(speed, clock)
 111                & MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
 112
 113        return 0;
 114}
 115
 116static int pxa2xx_pcmcia_set_mcxx(struct soc_pcmcia_socket *skt, unsigned int clk)
 117{
 118        struct soc_pcmcia_timing timing;
 119        int sock = skt->nr;
 120
 121        soc_common_pcmcia_get_timing(skt, &timing);
 122
 123        pxa2xx_pcmcia_set_mcmem(sock, timing.mem, clk);
 124        pxa2xx_pcmcia_set_mcatt(sock, timing.attr, clk);
 125        pxa2xx_pcmcia_set_mcio(sock, timing.io, clk);
 126
 127        return 0;
 128}
 129
 130static int pxa2xx_pcmcia_set_timing(struct soc_pcmcia_socket *skt)
 131{
 132        unsigned int clk = get_memclk_frequency_10khz();
 133        return pxa2xx_pcmcia_set_mcxx(skt, clk);
 134}
 135
 136#ifdef CONFIG_CPU_FREQ
 137
 138static int
 139pxa2xx_pcmcia_frequency_change(struct soc_pcmcia_socket *skt,
 140                               unsigned long val,
 141                               struct cpufreq_freqs *freqs)
 142{
 143#warning "it's not clear if this is right since the core CPU (N) clock has no effect on the memory (L) clock"
 144        switch (val) {
 145        case CPUFREQ_PRECHANGE:
 146                if (freqs->new > freqs->old) {
 147                        debug(skt, 2, "new frequency %u.%uMHz > %u.%uMHz, "
 148                               "pre-updating\n",
 149                               freqs->new / 1000, (freqs->new / 100) % 10,
 150                               freqs->old / 1000, (freqs->old / 100) % 10);
 151                        pxa2xx_pcmcia_set_mcxx(skt, freqs->new);
 152                }
 153                break;
 154
 155        case CPUFREQ_POSTCHANGE:
 156                if (freqs->new < freqs->old) {
 157                        debug(skt, 2, "new frequency %u.%uMHz < %u.%uMHz, "
 158                               "post-updating\n",
 159                               freqs->new / 1000, (freqs->new / 100) % 10,
 160                               freqs->old / 1000, (freqs->old / 100) % 10);
 161                        pxa2xx_pcmcia_set_mcxx(skt, freqs->new);
 162                }
 163                break;
 164        }
 165        return 0;
 166}
 167#endif
 168
 169static void pxa2xx_configure_sockets(struct device *dev)
 170{
 171        struct pcmcia_low_level *ops = dev->platform_data;
 172
 173        /*
 174         * We have at least one socket, so set MECR:CIT
 175         * (Card Is There)
 176         */
 177        MECR |= MECR_CIT;
 178
 179        /* Set MECR:NOS (Number Of Sockets) */
 180        if (ops->nr > 1 || machine_is_viper())
 181                MECR |= MECR_NOS;
 182        else
 183                MECR &= ~MECR_NOS;
 184}
 185
 186int __pxa2xx_drv_pcmcia_probe(struct device *dev)
 187{
 188        int ret;
 189        struct pcmcia_low_level *ops;
 190
 191        if (!dev || !dev->platform_data)
 192                return -ENODEV;
 193
 194        ops = (struct pcmcia_low_level *)dev->platform_data;
 195
 196        /* Provide our PXA2xx specific timing routines. */
 197        ops->set_timing  = pxa2xx_pcmcia_set_timing;
 198#ifdef CONFIG_CPU_FREQ
 199        ops->frequency_change = pxa2xx_pcmcia_frequency_change;
 200#endif
 201
 202        ret = soc_common_drv_pcmcia_probe(dev, ops, ops->first, ops->nr);
 203
 204        if (!ret)
 205                pxa2xx_configure_sockets(dev);
 206
 207        return ret;
 208}
 209EXPORT_SYMBOL(__pxa2xx_drv_pcmcia_probe);
 210
 211
 212static int pxa2xx_drv_pcmcia_probe(struct platform_device *dev)
 213{
 214        return __pxa2xx_drv_pcmcia_probe(&dev->dev);
 215}
 216
 217static int pxa2xx_drv_pcmcia_remove(struct platform_device *dev)
 218{
 219        return soc_common_drv_pcmcia_remove(&dev->dev);
 220}
 221
 222static int pxa2xx_drv_pcmcia_suspend(struct platform_device *dev, pm_message_t state)
 223{
 224        return pcmcia_socket_dev_suspend(&dev->dev, state);
 225}
 226
 227static int pxa2xx_drv_pcmcia_resume(struct platform_device *dev)
 228{
 229        pxa2xx_configure_sockets(&dev->dev);
 230        return pcmcia_socket_dev_resume(&dev->dev);
 231}
 232
 233static struct platform_driver pxa2xx_pcmcia_driver = {
 234        .probe          = pxa2xx_drv_pcmcia_probe,
 235        .remove         = pxa2xx_drv_pcmcia_remove,
 236        .suspend        = pxa2xx_drv_pcmcia_suspend,
 237        .resume         = pxa2xx_drv_pcmcia_resume,
 238        .driver         = {
 239                .name   = "pxa2xx-pcmcia",
 240                .owner  = THIS_MODULE,
 241        },
 242};
 243
 244static int __init pxa2xx_pcmcia_init(void)
 245{
 246        return platform_driver_register(&pxa2xx_pcmcia_driver);
 247}
 248
 249static void __exit pxa2xx_pcmcia_exit(void)
 250{
 251        platform_driver_unregister(&pxa2xx_pcmcia_driver);
 252}
 253
 254fs_initcall(pxa2xx_pcmcia_init);
 255module_exit(pxa2xx_pcmcia_exit);
 256
 257MODULE_AUTHOR("Stefan Eletzhofer <stefan.eletzhofer@inquant.de> and Ian Molton <spyro@f2s.com>");
 258MODULE_DESCRIPTION("Linux PCMCIA Card Services: PXA2xx core socket driver");
 259MODULE_LICENSE("GPL");
 260MODULE_ALIAS("platform:pxa2xx-pcmcia");
 261