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 <asm/hardware.h>
  28 #include <asm/io.h>
  29 #include <asm/irq.h>
  30 #include <asm/system.h>
  31 #include <asm/arch/pxa-regs.h>
  32
  33 #include <pcmcia/cs_types.h>
  34 #include <pcmcia/ss.h>
  35 #include <pcmcia/bulkmem.h>
  36 #include <pcmcia/cistpl.h>
  37
  38 #include "cs_internal.h"
  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
  50 static 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
  57 static 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
  64 static 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  */
  74 static 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
  80 static 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
  92 static 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
 104 static 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
 116 static 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
 130 static 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
 138 static int
 139 pxa2xx_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
 169 int pxa2xx_drv_pcmcia_probe(struct device *dev)
 170 {
 171         int ret;
 172         struct pcmcia_low_level *ops;
 173         int first, nr;
 174
 175         if (!dev || !dev->platform_data)
 176                 return -ENODEV;
 177
 178         ops = (struct pcmcia_low_level *)dev->platform_data;
 179         first = ops->first;
 180         nr = ops->nr;
 181
 182         /* Provide our PXA2xx specific timing routines. */
 183         ops->set_timing  = pxa2xx_pcmcia_set_timing;
 184 #ifdef CONFIG_CPU_FREQ
 185         ops->frequency_change = pxa2xx_pcmcia_frequency_change;
 186 #endif
 187
 188         ret = soc_common_drv_pcmcia_probe(dev, ops, first, nr);
 189
 190         if (ret == 0) {
 191                 /*
 192                  * We have at least one socket, so set MECR:CIT
 193                  * (Card Is There)
 194                  */
 195                 MECR |= MECR_CIT;
 196
 197                 /* Set MECR:NOS (Number Of Sockets) */
 198                 if (nr > 1)
 199                         MECR |= MECR_NOS;
 200                 else
 201                         MECR &= ~MECR_NOS;
 202         }
 203
 204         return ret;
 205 }
 206 EXPORT_SYMBOL(pxa2xx_drv_pcmcia_probe);
 207
 208 static int pxa2xx_drv_pcmcia_resume(struct device *dev)
 209 {
 210         struct pcmcia_low_level *ops = dev->platform_data;
 211         int nr = ops ? ops->nr : 0;
 212
 213         MECR = nr > 1 ? MECR_CIT | MECR_NOS : (nr > 0 ? MECR_CIT : 0);
 214
 215         return pcmcia_socket_dev_resume(dev);
 216 }
 217
 218 static struct device_driver pxa2xx_pcmcia_driver = {
 219         .probe          = pxa2xx_drv_pcmcia_probe,
 220         .remove         = soc_common_drv_pcmcia_remove,
 221         .suspend        = pcmcia_socket_dev_suspend,
 222         .resume         = pxa2xx_drv_pcmcia_resume,
 223         .name           = "pxa2xx-pcmcia",
 224         .bus            = &platform_bus_type,
 225 };
 226
 227 static int __init pxa2xx_pcmcia_init(void)
 228 {
 229         return driver_register(&pxa2xx_pcmcia_driver);
 230 }
 231
 232 static void __exit pxa2xx_pcmcia_exit(void)
 233 {
 234         driver_unregister(&pxa2xx_pcmcia_driver);
 235 }
 236
 237 fs_initcall(pxa2xx_pcmcia_init);
 238 module_exit(pxa2xx_pcmcia_exit);
 239
 240 MODULE_AUTHOR("Stefan Eletzhofer <stefan.eletzhofer@inquant.de> and Ian Molton <spyro@f2s.com>");
 241 MODULE_DESCRIPTION("Linux PCMCIA Card Services: PXA2xx core socket driver");
 242 MODULE_LICENSE("GPL");