arm/mach-pxa/pxa2xx.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  * linux/arch/arm/mach-pxa/pxa2xx.c
0004  *
0005  * code specific to pxa2xx
0006  *
0007  * Copyright (C) 2008 Dmitry Baryshkov
0008  */
0009
0010 #include <linux/module.h>
0011 #include <linux/kernel.h>
0012 #include <linux/device.h>
0013 #include <linux/io.h>
0014
0015 #include "pxa2xx-regs.h"
0016 #include "mfp-pxa25x.h"
0017 #include "generic.h"
0018 #include "reset.h"
0019 #include "smemc.h"
0020 #include <linux/soc/pxa/smemc.h>
0021 #include <linux/platform_data/irda-pxaficp.h>
0022
0023 void pxa2xx_clear_reset_status(unsigned int mask)
0024 {
0025     /* RESET_STATUS_* has a 1:1 mapping with RCSR */
0026     RCSR = mask;
0027 }
0028
0029 static unsigned long pxa2xx_mfp_fir[] = {
0030     GPIO46_FICP_RXD,
0031     GPIO47_FICP_TXD,
0032 };
0033
0034 static unsigned long pxa2xx_mfp_sir[] = {
0035     GPIO46_STUART_RXD,
0036     GPIO47_STUART_TXD,
0037 };
0038
0039 static unsigned long pxa2xx_mfp_off[] = {
0040     GPIO46_GPIO | MFP_LPM_DRIVE_LOW,
0041     GPIO47_GPIO | MFP_LPM_DRIVE_LOW,
0042 };
0043
0044 void pxa2xx_transceiver_mode(struct device *dev, int mode)
0045 {
0046     if (mode & IR_OFF) {
0047         pxa2xx_mfp_config(pxa2xx_mfp_off, ARRAY_SIZE(pxa2xx_mfp_off));
0048     } else if (mode & IR_SIRMODE) {
0049         pxa2xx_mfp_config(pxa2xx_mfp_sir, ARRAY_SIZE(pxa2xx_mfp_sir));
0050     } else if (mode & IR_FIRMODE) {
0051         pxa2xx_mfp_config(pxa2xx_mfp_fir, ARRAY_SIZE(pxa2xx_mfp_fir));
0052     } else
0053         BUG();
0054 }
0055 EXPORT_SYMBOL_GPL(pxa2xx_transceiver_mode);
0056
0057 #define MDCNFG_DRAC2(mdcnfg)    (((mdcnfg) >> 21) & 0x3)
0058 #define MDCNFG_DRAC0(mdcnfg)    (((mdcnfg) >> 5) & 0x3)
0059
0060 int pxa2xx_smemc_get_sdram_rows(void)
0061 {
0062     static int sdram_rows;
0063     unsigned int drac2 = 0, drac0 = 0;
0064     u32 mdcnfg;
0065
0066     if (sdram_rows)
0067         return sdram_rows;
0068
0069     mdcnfg = readl_relaxed(MDCNFG);
0070
0071     if (mdcnfg & (MDCNFG_DE2 | MDCNFG_DE3))
0072         drac2 = MDCNFG_DRAC2(mdcnfg);
0073
0074     if (mdcnfg & (MDCNFG_DE0 | MDCNFG_DE1))
0075         drac0 = MDCNFG_DRAC0(mdcnfg);
0076
0077     sdram_rows = 1 << (11 + max(drac0, drac2));
0078     return sdram_rows;
0079 }