arch/arm/mach-pxa/pxa2xx.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * linux/arch/arm/mach-pxa/pxa2xx.c
   4  *
   5  * code specific to pxa2xx
   6  *
   7  * Copyright (C) 2008 Dmitry Baryshkov
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/kernel.h>
  12 #include <linux/device.h>
  13 #include <linux/io.h>
  14
  15 #include "pxa2xx-regs.h"
  16 #include "mfp-pxa25x.h"
  17 #include "generic.h"
  18 #include "reset.h"
  19 #include "smemc.h"
  20 #include <linux/soc/pxa/smemc.h>
  21
  22 void pxa2xx_clear_reset_status(unsigned int mask)
  23 {
  24         /* RESET_STATUS_* has a 1:1 mapping with RCSR */
  25         RCSR = mask;
  26 }
  27
  28 #define MDCNFG_DRAC2(mdcnfg)    (((mdcnfg) >> 21) & 0x3)
  29 #define MDCNFG_DRAC0(mdcnfg)    (((mdcnfg) >> 5) & 0x3)
  30
  31 int pxa2xx_smemc_get_sdram_rows(void)
  32 {
  33         static int sdram_rows;
  34         unsigned int drac2 = 0, drac0 = 0;
  35         u32 mdcnfg;
  36
  37         if (sdram_rows)
  38                 return sdram_rows;
  39
  40         mdcnfg = readl_relaxed(MDCNFG);
  41
  42         if (mdcnfg & (MDCNFG_DE2 | MDCNFG_DE3))
  43                 drac2 = MDCNFG_DRAC2(mdcnfg);
  44
  45         if (mdcnfg & (MDCNFG_DE0 | MDCNFG_DE1))
  46                 drac0 = MDCNFG_DRAC0(mdcnfg);
  47
  48         sdram_rows = 1 << (11 + max(drac0, drac2));
  49         return sdram_rows;
  50 }