target/linux/ar71xx/files/arch/mips/ath79/dev-nfc.c

   1 /*
   2  *  Atheros AR934X SoCs built-in NAND flash controller support
   3  *
   4  *  Copyright (C) 2011-2012 Gabor Juhos <juhosg@openwrt.org>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify it
   7  *  under the terms of the GNU General Public License version 2 as published
   8  *  by the Free Software Foundation.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/delay.h>
  13 #include <linux/init.h>
  14 #include <linux/irq.h>
  15 #include <linux/dma-mapping.h>
  16 #include <linux/etherdevice.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/platform/ar934x_nfc.h>
  19
  20 #include <asm/mach-ath79/ath79.h>
  21 #include <asm/mach-ath79/ar71xx_regs.h>
  22
  23 #include "dev-nfc.h"
  24
  25 static struct resource ath79_nfc_resources[2];
  26 static u64 ar934x_nfc_dmamask = DMA_BIT_MASK(32);
  27 static struct ar934x_nfc_platform_data ath79_nfc_data;
  28
  29 static struct platform_device ath79_nfc_device = {
  30         .name           = AR934X_NFC_DRIVER_NAME,
  31         .id             = -1,
  32         .resource       = ath79_nfc_resources,
  33         .num_resources  = ARRAY_SIZE(ath79_nfc_resources),
  34         .dev = {
  35                 .dma_mask = &ar934x_nfc_dmamask,
  36                 .coherent_dma_mask = DMA_BIT_MASK(32),
  37                 .platform_data = &ath79_nfc_data,
  38         },
  39 };
  40
  41 static void ar934x_nfc_hw_reset(bool active)
  42 {
  43         if (active) {
  44                 ath79_device_reset_set(AR934X_RESET_NANDF);
  45                 udelay(100);
  46
  47                 ath79_device_reset_set(AR934X_RESET_ETH_SWITCH_ANALOG);
  48                 udelay(250);
  49         } else {
  50                 ath79_device_reset_clear(AR934X_RESET_ETH_SWITCH_ANALOG);
  51                 udelay(250);
  52
  53                 ath79_device_reset_clear(AR934X_RESET_NANDF);
  54                 udelay(100);
  55         }
  56 }
  57
  58 static void ar934x_nfc_setup(void)
  59 {
  60         ath79_nfc_resources[0].start = AR934X_NFC_BASE;
  61         ath79_nfc_resources[0].end = AR934X_NFC_BASE + AR934X_NFC_SIZE - 1;
  62         ath79_nfc_resources[0].flags = IORESOURCE_MEM;
  63
  64         ath79_nfc_resources[1].start = ATH79_MISC_IRQ(21);
  65         ath79_nfc_resources[1].end = ATH79_MISC_IRQ(21);
  66         ath79_nfc_resources[1].flags = IORESOURCE_IRQ;
  67
  68         ath79_nfc_data.hw_reset = ar934x_nfc_hw_reset;
  69
  70         platform_device_register(&ath79_nfc_device);
  71 }
  72
  73 void __init ath79_nfc_set_select_chip(void (*f)(int chip_no))
  74 {
  75         ath79_nfc_data.select_chip = f;
  76 }
  77
  78 void __init ath79_nfc_set_scan_fixup(int (*f)(struct mtd_info *mtd))
  79 {
  80         ath79_nfc_data.scan_fixup = f;
  81 }
  82
  83 void __init ath79_nfc_set_parts(struct mtd_partition *parts, int nr_parts)
  84 {
  85         ath79_nfc_data.parts = parts;
  86         ath79_nfc_data.nr_parts = nr_parts;
  87 }
  88
  89 void __init ath79_register_nfc(void)
  90 {
  91         if (soc_is_ar934x())
  92                 ar934x_nfc_setup();
  93         else
  94                 BUG();
  95 }