drivers/mtd/nand/raw/brcmnand/bcm6368_nand.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2
   3 #include <common.h>
   4 #include <asm/io.h>
   5 #include <memalign.h>
   6 #include <nand.h>
   7 #include <linux/bitops.h>
   8 #include <linux/errno.h>
   9 #include <linux/io.h>
  10 #include <linux/ioport.h>
  11 #include <dm.h>
  12
  13 #include "brcmnand.h"
  14
  15 struct bcm6368_nand_soc {
  16         struct brcmnand_soc soc;
  17         void __iomem *base;
  18 };
  19
  20 #define soc_to_priv(_soc) container_of(_soc, struct bcm6368_nand_soc, soc)
  21
  22 #define BCM6368_NAND_INT                0x00
  23 #define  BCM6368_NAND_STATUS_SHIFT      0
  24 #define  BCM6368_NAND_STATUS_MASK       (0xfff << BCM6368_NAND_STATUS_SHIFT)
  25 #define  BCM6368_NAND_ENABLE_SHIFT      16
  26 #define  BCM6368_NAND_ENABLE_MASK       (0xffff << BCM6368_NAND_ENABLE_SHIFT)
  27
  28 enum {
  29         BCM6368_NP_READ         = BIT(0),
  30         BCM6368_BLOCK_ERASE     = BIT(1),
  31         BCM6368_COPY_BACK       = BIT(2),
  32         BCM6368_PAGE_PGM        = BIT(3),
  33         BCM6368_CTRL_READY      = BIT(4),
  34         BCM6368_DEV_RBPIN       = BIT(5),
  35         BCM6368_ECC_ERR_UNC     = BIT(6),
  36         BCM6368_ECC_ERR_CORR    = BIT(7),
  37 };
  38
  39 static bool bcm6368_nand_intc_ack(struct brcmnand_soc *soc)
  40 {
  41         struct bcm6368_nand_soc *priv = soc_to_priv(soc);
  42         void __iomem *mmio = priv->base + BCM6368_NAND_INT;
  43         u32 val = brcmnand_readl(mmio);
  44
  45         if (val & (BCM6368_CTRL_READY << BCM6368_NAND_STATUS_SHIFT)) {
  46                 /* Ack interrupt */
  47                 val &= ~BCM6368_NAND_STATUS_MASK;
  48                 val |= BCM6368_CTRL_READY << BCM6368_NAND_STATUS_SHIFT;
  49                 brcmnand_writel(val, mmio);
  50                 return true;
  51         }
  52
  53         return false;
  54 }
  55
  56 static void bcm6368_nand_intc_set(struct brcmnand_soc *soc, bool en)
  57 {
  58         struct bcm6368_nand_soc *priv = soc_to_priv(soc);
  59         void __iomem *mmio = priv->base + BCM6368_NAND_INT;
  60         u32 val = brcmnand_readl(mmio);
  61
  62         /* Don't ack any interrupts */
  63         val &= ~BCM6368_NAND_STATUS_MASK;
  64
  65         if (en)
  66                 val |= BCM6368_CTRL_READY << BCM6368_NAND_ENABLE_SHIFT;
  67         else
  68                 val &= ~(BCM6368_CTRL_READY << BCM6368_NAND_ENABLE_SHIFT);
  69
  70         brcmnand_writel(val, mmio);
  71 }
  72
  73 static int bcm6368_nand_probe(struct udevice *dev)
  74 {
  75         struct bcm6368_nand_soc *priv = dev_get_priv(dev);
  76         struct brcmnand_soc *soc = &priv->soc;
  77
  78         priv->base = dev_remap_addr_name(dev, "nand-int-base");
  79         if (!priv->base)
  80                 return -EINVAL;
  81
  82         soc->ctlrdy_ack = bcm6368_nand_intc_ack;
  83         soc->ctlrdy_set_enabled = bcm6368_nand_intc_set;
  84
  85         /* Disable and ack all interrupts  */
  86         brcmnand_writel(0, priv->base + BCM6368_NAND_INT);
  87         brcmnand_writel(BCM6368_NAND_STATUS_MASK,
  88                         priv->base + BCM6368_NAND_INT);
  89
  90         return brcmnand_probe(dev, soc);
  91 }
  92
  93 static const struct udevice_id bcm6368_nand_dt_ids[] = {
  94         {
  95                 .compatible = "brcm,nand-bcm6368",
  96         },
  97         { /* sentinel */ }
  98 };
  99
 100 U_BOOT_DRIVER(bcm6368_nand) = {
 101         .name = "bcm6368-nand",
 102         .id = UCLASS_MTD,
 103         .of_match = bcm6368_nand_dt_ids,
 104         .probe = bcm6368_nand_probe,
 105         .priv_auto_alloc_size = sizeof(struct bcm6368_nand_soc),
 106 };
 107
 108 void board_nand_init(void)
 109 {
 110         struct udevice *dev;
 111         int ret;
 112
 113         ret = uclass_get_device_by_driver(UCLASS_MTD,
 114                                           DM_GET_DRIVER(bcm6368_nand), &dev);
 115         if (ret && ret != -ENODEV)
 116                 pr_err("Failed to initialize %s. (error %d)\n", dev->name,
 117                        ret);
 118 }