drivers/mtd/nand/raw/brcmnand/bcm6838_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/errno.h>
   8 #include <linux/io.h>
   9 #include <linux/ioport.h>
  10 #include <dm.h>
  11
  12 #include "brcmnand.h"
  13
  14 struct bcm6838_nand_soc {
  15         struct brcmnand_soc soc;
  16         void __iomem *base;
  17 };
  18
  19 #define BCM6838_NAND_INT                0x00
  20 #define  BCM6838_NAND_STATUS_SHIFT      0
  21 #define  BCM6838_NAND_STATUS_MASK       (0xfff << BCM6838_NAND_STATUS_SHIFT)
  22 #define  BCM6838_NAND_ENABLE_SHIFT      16
  23 #define  BCM6838_NAND_ENABLE_MASK       (0xffff << BCM6838_NAND_ENABLE_SHIFT)
  24
  25 enum {
  26         BCM6838_NP_READ         = BIT(0),
  27         BCM6838_BLOCK_ERASE     = BIT(1),
  28         BCM6838_COPY_BACK       = BIT(2),
  29         BCM6838_PAGE_PGM        = BIT(3),
  30         BCM6838_CTRL_READY      = BIT(4),
  31         BCM6838_DEV_RBPIN       = BIT(5),
  32         BCM6838_ECC_ERR_UNC     = BIT(6),
  33         BCM6838_ECC_ERR_CORR    = BIT(7),
  34 };
  35
  36 static bool bcm6838_nand_intc_ack(struct brcmnand_soc *soc)
  37 {
  38         struct bcm6838_nand_soc *priv =
  39                         container_of(soc, struct bcm6838_nand_soc, soc);
  40         void __iomem *mmio = priv->base + BCM6838_NAND_INT;
  41         u32 val = brcmnand_readl(mmio);
  42
  43         if (val & (BCM6838_CTRL_READY << BCM6838_NAND_STATUS_SHIFT)) {
  44                 /* Ack interrupt */
  45                 val &= ~BCM6838_NAND_STATUS_MASK;
  46                 val |= BCM6838_CTRL_READY << BCM6838_NAND_STATUS_SHIFT;
  47                 brcmnand_writel(val, mmio);
  48                 return true;
  49         }
  50
  51         return false;
  52 }
  53
  54 static void bcm6838_nand_intc_set(struct brcmnand_soc *soc, bool en)
  55 {
  56         struct bcm6838_nand_soc *priv =
  57                         container_of(soc, struct bcm6838_nand_soc, soc);
  58         void __iomem *mmio = priv->base + BCM6838_NAND_INT;
  59         u32 val = brcmnand_readl(mmio);
  60
  61         /* Don't ack any interrupts */
  62         val &= ~BCM6838_NAND_STATUS_MASK;
  63
  64         if (en)
  65                 val |= BCM6838_CTRL_READY << BCM6838_NAND_ENABLE_SHIFT;
  66         else
  67                 val &= ~(BCM6838_CTRL_READY << BCM6838_NAND_ENABLE_SHIFT);
  68
  69         brcmnand_writel(val, mmio);
  70 }
  71
  72 static int bcm6838_nand_probe(struct udevice *dev)
  73 {
  74         struct udevice *pdev = dev;
  75         struct bcm6838_nand_soc *priv = dev_get_priv(dev);
  76         struct brcmnand_soc *soc;
  77         struct resource res;
  78
  79         soc = &priv->soc;
  80
  81         dev_read_resource_byname(pdev, "nand-int-base", &res);
  82         priv->base = ioremap(res.start, resource_size(&res));
  83         if (IS_ERR(priv->base))
  84                 return PTR_ERR(priv->base);
  85
  86         soc->ctlrdy_ack = bcm6838_nand_intc_ack;
  87         soc->ctlrdy_set_enabled = bcm6838_nand_intc_set;
  88
  89         /* Disable and ack all interrupts  */
  90         brcmnand_writel(0, priv->base + BCM6838_NAND_INT);
  91         brcmnand_writel(BCM6838_NAND_STATUS_MASK,
  92                         priv->base + BCM6838_NAND_INT);
  93
  94         return brcmnand_probe(pdev, soc);
  95 }
  96
  97 static const struct udevice_id bcm6838_nand_dt_ids[] = {
  98         {
  99                 .compatible = "brcm,nand-bcm6838",
 100         },
 101         { /* sentinel */ }
 102 };
 103
 104 U_BOOT_DRIVER(bcm6838_nand) = {
 105         .name = "bcm6838-nand",
 106         .id = UCLASS_MTD,
 107         .of_match = bcm6838_nand_dt_ids,
 108         .probe = bcm6838_nand_probe,
 109         .priv_auto_alloc_size = sizeof(struct bcm6838_nand_soc),
 110 };
 111
 112 void board_nand_init(void)
 113 {
 114         struct udevice *dev;
 115         int ret;
 116
 117         ret = uclass_get_device_by_driver(UCLASS_MTD,
 118                                           DM_GET_DRIVER(bcm6838_nand), &dev);
 119         if (ret && ret != -ENODEV)
 120                 pr_err("Failed to initialize %s. (error %d)\n", dev->name,
 121                        ret);
 122 }