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  */
  32 static 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
  54 static void (*_omap_sram_reprogram_clock)(u32 dpllctl, u32 ckctl);
  55
  56 void 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
  65 int __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 }