LXR linux/arch/arm/mach-omap1/sram-init.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * OMAP SRAM detection and management
   4 *
   5 * Copyright (C) 2005 Nokia Corporation
   6 * Written by Tony Lindgren <tony@atomide.com>
   7 */
   8
   9#include <linux/module.h>
  10#include <linux/kernel.h>
  11#include <linux/init.h>
  12#include <linux/io.h>
  13
  14#include <asm/fncpy.h>
  15#include <asm/tlb.h>
  16#include <asm/cacheflush.h>
  17
  18#include <asm/mach/map.h>
  19
  20#include "soc.h"
  21#include "sram.h"
  22
  23#define OMAP1_SRAM_PA           0x20000000
  24#define SRAM_BOOTLOADER_SZ      0x80
  25
  26/*
  27 * The amount of SRAM depends on the core type.
  28 * Note that we cannot try to test for SRAM here because writes
  29 * to secure SRAM will hang the system. Also the SRAM is not
  30 * yet mapped at this point.
  31 */
  32static void __init omap_detect_and_map_sram(void)
  33{
  34        unsigned long omap_sram_skip = SRAM_BOOTLOADER_SZ;
  35        unsigned long omap_sram_start = OMAP1_SRAM_PA;
  36        unsigned long omap_sram_size;
  37
  38        if (cpu_is_omap7xx())
  39                omap_sram_size = 0x32000;       /* 200K */
  40        else if (cpu_is_omap15xx())
  41                omap_sram_size = 0x30000;       /* 192K */
  42        else if (cpu_is_omap1610() || cpu_is_omap1611() ||
  43                        cpu_is_omap1621() || cpu_is_omap1710())
  44                omap_sram_size = 0x4000;        /* 16K */
  45        else {
  46                pr_err("Could not detect SRAM size\n");
  47                omap_sram_size = 0x4000;
  48        }
  49
  50        omap_map_sram(omap_sram_start, omap_sram_size,
  51                omap_sram_skip, 1);
  52}
  53
  54static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl);
  55
  56void omap_sram_reprogram_clock(u32 dpllctl, u32 ckctl)
  57{
  58        BUG_ON(!_omap_sram_reprogram_clock);
  59        /* On 730, bit 13 must always be 1 */
  60        if (cpu_is_omap7xx())
  61                ckctl |= 0x2000;
  62        _omap_sram_reprogram_clock(dpllctl, ckctl);
  63}
  64
  65int __init omap_sram_init(void)
  66{
  67        omap_detect_and_map_sram();
  68        _omap_sram_reprogram_clock =
  69                        omap_sram_push(omap1_sram_reprogram_clock,
  70                                        omap1_sram_reprogram_clock_sz);
  71
  72        return 0;
  73}
  74