linux-imx

/*

 *  linux/arch/arm/mach-sa1100/cpu-sa1110.c

 *

 *  Copyright (C) 2001 Russell King

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 * Note: there are two erratas that apply to the SA1110 here:

 *  7 - SDRAM auto-power-up failure (rev A0)

 * 13 - Corruption of internal register reads/writes following

 *      SDRAM reads (rev A0, B0, B1)

 *

 * We ignore rev. A0 and B0 devices; I don't think they're worth supporting.

 *

 * The SDRAM type can be passed on the command line as cpu_sa1110.sdram=type

 */

#include <linux/cpufreq.h>

#include <linux/delay.h>

#include <linux/init.h>

#include <linux/io.h>

#include <linux/kernel.h>

#include <linux/moduleparam.h>

#include <linux/types.h>

​

#include <asm/cputype.h>

#include <asm/mach-types.h>

​

#include <mach/generic.h>

#include <mach/hardware.h>

​

#undef DEBUG

​

struct sdram_params {

    const char name[20];

    u_char  rows;       /* bits              */

    u_char  cas_latency;    /* cycles            */

    u_char  tck;        /* clock cycle time (ns)     */

    u_char  trcd;       /* activate to r/w (ns)      */

    u_char  trp;        /* precharge to activate (ns)    */

    u_char  twr;        /* write recovery time (ns)  */

    u_short refresh;    /* refresh time for array (us)   */

};

​

struct sdram_info {

    u_int   mdcnfg;

    u_int   mdrefr;

    u_int   mdcas[3];

};

​

static struct sdram_params sdram_tbl[] __initdata = {

    {   /* Toshiba TC59SM716 CL2 */

        .name       = "TC59SM716-CL2",

        .rows       = 12,

        .tck        = 10,

        .trcd       = 20,

        .trp        = 20,

        .twr        = 10,

        .refresh    = 64000,

        .cas_latency    = 2,

    }, {    /* Toshiba TC59SM716 CL3 */

        .name       = "TC59SM716-CL3",

        .rows       = 12,

        .tck        = 8,

        .trcd       = 20,

        .trp        = 20,

        .twr        = 8,

        .refresh    = 64000,

        .cas_latency    = 3,

    }, {    /* Samsung K4S641632D TC75 */

        .name       = "K4S641632D",

        .rows       = 14,

        .tck        = 9,

        .trcd       = 27,

        .trp        = 20,

        .twr        = 9,

        .refresh    = 64000,

        .cas_latency    = 3,

    }, {    /* Samsung K4S281632B-1H */

        .name           = "K4S281632B-1H",

        .rows       = 12,

        .tck        = 10,

        .trp        = 20,

        .twr        = 10,

        .refresh    = 64000,

        .cas_latency    = 3,

    }, {    /* Samsung KM416S4030CT */

        .name       = "KM416S4030CT",

        .rows       = 13,

        .tck        = 8,

        .trcd       = 24,   /* 3 CLKs */