| 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 |