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 } 51