include/asm-avr32/arch-at32ap/smc.h

   1 /*
   2  * Static Memory Controller for AT32 chips
   3  *
   4  * Copyright (C) 2006 Atmel Corporation
   5  *
   6  * Inspired by the OMAP2 General-Purpose Memory Controller interface
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12 #ifndef __ARCH_AT32AP_SMC_H
  13 #define __ARCH_AT32AP_SMC_H
  14
  15 /*
  16  * All timing parameters are in nanoseconds.
  17  */
  18 struct smc_timing {
  19         /* Delay from address valid to assertion of given strobe */
  20         int ncs_read_setup;
  21         int nrd_setup;
  22         int ncs_write_setup;
  23         int nwe_setup;
  24
  25         /* Pulse length of given strobe */
  26         int ncs_read_pulse;
  27         int nrd_pulse;
  28         int ncs_write_pulse;
  29         int nwe_pulse;
  30
  31         /* Total cycle length of given operation */
  32         int read_cycle;
  33         int write_cycle;
  34
  35         /* Minimal recovery times, will extend cycle if needed */
  36         int ncs_read_recover;
  37         int nrd_recover;
  38         int ncs_write_recover;
  39         int nwe_recover;
  40 };
  41
  42 /*
  43  * All timing parameters are in clock cycles.
  44  */
  45 struct smc_config {
  46
  47         /* Delay from address valid to assertion of given strobe */
  48         u8              ncs_read_setup;
  49         u8              nrd_setup;
  50         u8              ncs_write_setup;
  51         u8              nwe_setup;
  52
  53         /* Pulse length of given strobe */
  54         u8              ncs_read_pulse;
  55         u8              nrd_pulse;
  56         u8              ncs_write_pulse;
  57         u8              nwe_pulse;
  58
  59         /* Total cycle length of given operation */
  60         u8              read_cycle;
  61         u8              write_cycle;
  62
  63         /* Bus width in bytes */
  64         u8              bus_width;
  65
  66         /*
  67          * 0: Data is sampled on rising edge of NCS
  68          * 1: Data is sampled on rising edge of NRD
  69          */
  70         unsigned int    nrd_controlled:1;
  71
  72         /*
  73          * 0: Data is driven on falling edge of NCS
  74          * 1: Data is driven on falling edge of NWR
  75          */
  76         unsigned int    nwe_controlled:1;
  77
  78         /*
  79          * 0: NWAIT is disabled
  80          * 1: Reserved
  81          * 2: NWAIT is frozen mode
  82          * 3: NWAIT in ready mode
  83          */
  84         unsigned int    nwait_mode:2;
  85
  86         /*
  87          * 0: Byte select access type
  88          * 1: Byte write access type
  89          */
  90         unsigned int    byte_write:1;
  91
  92         /*
  93          * Number of clock cycles before data is released after
  94          * the rising edge of the read controlling signal
  95          *
  96          * Total cycles from SMC is tdf_cycles + 1
  97          */
  98         unsigned int    tdf_cycles:4;
  99
 100         /*
 101          * 0: TDF optimization disabled
 102          * 1: TDF optimization enabled
 103          */
 104         unsigned int    tdf_mode:1;
 105 };
 106
 107 extern void smc_set_timing(struct smc_config *config,
 108                            const struct smc_timing *timing);
 109
 110 extern int smc_set_configuration(int cs, const struct smc_config *config);
 111 extern struct smc_config *smc_get_configuration(int cs);
 112
 113 #endif /* __ARCH_AT32AP_SMC_H */