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/config.h>
  22 #include <linux/cpufreq.h>
  23 #include <linux/ioport.h>
  24 #include <linux/kernel.h>
  25 #include <linux/spinlock.h>
  26 #include <linux/platform_device.h>
  27
  28 #include <asm/hardware.h>
  29 #include <asm/io.h>
  30 #include <asm/irq.h>
  31 #include <asm/system.h>
  32 #include <asm/arch/pxa-regs.h>
  33
  34 #include <pcmcia/cs_types.h>
  35 #include <pcmcia/ss.h>
  36 #include <pcmcia/bulkmem.h>
  37 #include <pcmcia/cistpl.h>
  38
  39 #include "cs_internal.h"
  40 #include "soc_common.h"
  41 #include "pxa2xx_base.h"
  42
  43
  44 #define MCXX_SETUP_MASK     (0x7f)
  45 #define MCXX_ASST_MASK      (0x1f)
  46 #define MCXX_HOLD_MASK      (0x3f)
  47 #define MCXX_SETUP_SHIFT    (0)
  48 #define MCXX_ASST_SHIFT     (7)
  49 #define MCXX_HOLD_SHIFT     (14)
  50
  51 static inline u_int pxa2xx_mcxx_hold(u_int pcmcia_cycle_ns,
  52                                      u_int mem_clk_10khz)
  53 {
  54         u_int code = pcmcia_cycle_ns * mem_clk_10khz;
  55         return (code / 300000) + ((code % 300000) ? 1 : 0) - 1;
  56 }
  57
  58 static inline u_int pxa2xx_mcxx_asst(u_int pcmcia_cycle_ns,
  59                                      u_int mem_clk_10khz)
  60 {
  61         u_int code = pcmcia_cycle_ns * mem_clk_10khz;
  62         return (code / 300000) + ((code % 300000) ? 1 : 0) - 1;
  63 }
  64
  65 static inline u_int pxa2xx_mcxx_setup(u_int pcmcia_cycle_ns,
  66                                       u_int mem_clk_10khz)
  67 {
  68         u_int code = pcmcia_cycle_ns * mem_clk_10khz;
  69         return (code / 100000) + ((code % 100000) ? 1 : 0) - 1;
  70 }
  71
  72 /* This function returns the (approximate) command assertion period, in
  73  * nanoseconds, for a given CPU clock frequency and MCXX_ASST value:
  74  */
  75 static inline u_int pxa2xx_pcmcia_cmd_time(u_int mem_clk_10khz,
  76                                            u_int pcmcia_mcxx_asst)
  77 {
  78         return (300000 * (pcmcia_mcxx_asst + 1) / mem_clk_10khz);
  79 }
  80
  81 static int pxa2xx_pcmcia_set_mcmem( int sock, int speed, int clock )
  82 {
  83         MCMEM(sock) = ((pxa2xx_mcxx_setup(speed, clock)
  84                 & MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
  85                 | ((pxa2xx_mcxx_asst(speed, clock)
  86                 & MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
  87                 | ((pxa2xx_mcxx_hold(speed, clock)
  88                 & MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
  89
  90         return 0;
  91 }
  92
  93 static int pxa2xx_pcmcia_set_mcio( int sock, int speed, int clock )
  94 {
  95         MCIO(sock) = ((pxa2xx_mcxx_setup(speed, clock)
  96                 & MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
  97                 | ((pxa2xx_mcxx_asst(speed, clock)
  98                 & MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
  99                 | ((pxa2xx_mcxx_hold(speed, clock)
 100                 & MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
 101
 102         return 0;
 103 }
 104
 105 static int pxa2xx_pcmcia_set_mcatt( int sock, int speed, int clock )
 106 {
 107         MCATT(sock) = ((pxa2xx_mcxx_setup(speed, clock)
 108                 & MCXX_SETUP_MASK) << MCXX_SETUP_SHIFT)
 109                 | ((pxa2xx_mcxx_asst(speed, clock)
 110                 & MCXX_ASST_MASK) << MCXX_ASST_SHIFT)
 111                 | ((pxa2xx_mcxx_hold(speed, clock)
 112                 & MCXX_HOLD_MASK) << MCXX_HOLD_SHIFT);
 113
 114         return 0;
 115 }
 116
 117 static int pxa2xx_pcmcia_set_mcxx(struct soc_pcmcia_socket *skt, unsigned int clk)
 118 {
 119         struct soc_pcmcia_timing timing;
 120         int sock = skt->nr;
 121
 122         soc_common_pcmcia_get_timing(skt, &timing);
 123
 124         pxa2xx_pcmcia_set_mcmem(sock, timing.mem, clk);
 125         pxa2xx_pcmcia_set_mcatt(sock, timing.attr, clk);
 126         pxa2xx_pcmcia_set_mcio(sock, timing.io, clk);
 127
 128         return 0;
 129 }
 130
 131 static int pxa2xx_pcmcia_set_timing(struct soc_pcmcia_socket *skt)
 132 {
 133         unsigned int clk = get_memclk_frequency_10khz();
 134         return pxa2xx_pcmcia_set_mcxx(skt, clk);
 135 }
 136
 137 #ifdef CONFIG_CPU_FREQ
 138
 139 static int
 140 pxa2xx_pcmcia_frequency_change(struct soc_pcmcia_socket *skt,
 141                                unsigned long val,
 142                                struct cpufreq_freqs *freqs)
 143 {
 144 #warning "it's not clear if this is right since the core CPU (N) clock has no effect on the memory (L) clock"
 145         switch (val) {
 146         case CPUFREQ_PRECHANGE:
 147                 if (freqs->new > freqs->old) {
 148                         debug(skt, 2, "new frequency %u.%uMHz > %u.%uMHz, "
 149                                "pre-updating\n",
 150                                freqs->new / 1000, (freqs->new / 100) % 10,
 151                                freqs->old / 1000, (freqs->old / 100) % 10);
 152                         pxa2xx_pcmcia_set_mcxx(skt, freqs->new);
 153                 }
 154                 break;
 155
 156         case CPUFREQ_POSTCHANGE:
 157                 if (freqs->new < freqs->old) {
 158                         debug(skt, 2, "new frequency %u.%uMHz < %u.%uMHz, "
 159                                "post-updating\n",
 160                                freqs->new / 1000, (freqs->new / 100) % 10,
 161                                freqs->old / 1000, (freqs->old / 100) % 10);
 162                         pxa2xx_pcmcia_set_mcxx(skt, freqs->new);
 163                 }
 164                 break;
 165         }
 166         return 0;
 167 }
 168 #endif
 169
 170 int pxa2xx_drv_pcmcia_probe(struct device *dev)
 171 {
 172         int ret;
 173         struct pcmcia_low_level *ops;
 174         int first, nr;
 175
 176         if (!dev || !dev->platform_data)
 177                 return -ENODEV;
 178
 179         ops = (struct pcmcia_low_level *)dev->platform_data;
 180         first = ops->first;
 181         nr = ops->nr;
 182
 183         /* Provide our PXA2xx specific timing routines. */
 184         ops->set_timing  = pxa2xx_pcmcia_set_timing;
 185 #ifdef CONFIG_CPU_FREQ
 186         ops->frequency_change = pxa2xx_pcmcia_frequency_change;
 187 #endif
 188
 189         ret = soc_common_drv_pcmcia_probe(dev, ops, first, nr);
 190
 191         if (ret == 0) {
 192                 /*
 193                  * We have at least one socket, so set MECR:CIT
 194                  * (Card Is There)
 195                  */
 196                 MECR |= MECR_CIT;
 197
 198                 /* Set MECR:NOS (Number Of Sockets) */
 199                 if (nr > 1)
 200                         MECR |= MECR_NOS;
 201                 else
 202                         MECR &= ~MECR_NOS;
 203         }
 204
 205         return ret;
 206 }
 207 EXPORT_SYMBOL(pxa2xx_drv_pcmcia_probe);
 208
 209 static int pxa2xx_drv_pcmcia_resume(struct device *dev)
 210 {
 211         struct pcmcia_low_level *ops = dev->platform_data;
 212         int nr = ops ? ops->nr : 0;
 213
 214         MECR = nr > 1 ? MECR_CIT | MECR_NOS : (nr > 0 ? MECR_CIT : 0);
 215
 216         return pcmcia_socket_dev_resume(dev);
 217 }
 218
 219 static struct device_driver pxa2xx_pcmcia_driver = {
 220         .probe          = pxa2xx_drv_pcmcia_probe,
 221         .remove         = soc_common_drv_pcmcia_remove,
 222         .suspend        = pcmcia_socket_dev_suspend,
 223         .resume         = pxa2xx_drv_pcmcia_resume,
 224         .name           = "pxa2xx-pcmcia",
 225         .bus            = &platform_bus_type,
 226 };
 227
 228 static int __init pxa2xx_pcmcia_init(void)
 229 {
 230         return driver_register(&pxa2xx_pcmcia_driver);
 231 }
 232
 233 static void __exit pxa2xx_pcmcia_exit(void)
 234 {
 235         driver_unregister(&pxa2xx_pcmcia_driver);
 236 }
 237
 238 fs_initcall(pxa2xx_pcmcia_init);
 239 module_exit(pxa2xx_pcmcia_exit);
 240
 241 MODULE_AUTHOR("Stefan Eletzhofer <stefan.eletzhofer@inquant.de> and Ian Molton <spyro@f2s.com>");
 242 MODULE_DESCRIPTION("Linux PCMCIA Card Services: PXA2xx core socket driver");
 243 MODULE_LICENSE("GPL");