drivers/mtd/nand/brcmnand/bcm63138_nand.c

   1 /*
   2  * Copyright © 2015 Broadcom Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <linux/device.h>
  15 #include <linux/io.h>
  16 #include <linux/ioport.h>
  17 #include <linux/module.h>
  18 #include <linux/of.h>
  19 #include <linux/of_address.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/slab.h>
  22
  23 #include "brcmnand.h"
  24
  25 struct bcm63138_nand_soc_priv {
  26         void __iomem *base;
  27 };
  28
  29 #define BCM63138_NAND_INT_STATUS                0x00
  30 #define BCM63138_NAND_INT_EN                    0x04
  31
  32 enum {
  33         BCM63138_CTLRDY         = BIT(4),
  34 };
  35
  36 static bool bcm63138_nand_intc_ack(struct brcmnand_soc *soc)
  37 {
  38         struct bcm63138_nand_soc_priv *priv = soc->priv;
  39         void __iomem *mmio = priv->base + BCM63138_NAND_INT_STATUS;
  40         u32 val = brcmnand_readl(mmio);
  41
  42         if (val & BCM63138_CTLRDY) {
  43                 brcmnand_writel(val & ~BCM63138_CTLRDY, mmio);
  44                 return true;
  45         }
  46
  47         return false;
  48 }
  49
  50 static void bcm63138_nand_intc_set(struct brcmnand_soc *soc, bool en)
  51 {
  52         struct bcm63138_nand_soc_priv *priv = soc->priv;
  53         void __iomem *mmio = priv->base + BCM63138_NAND_INT_EN;
  54         u32 val = brcmnand_readl(mmio);
  55
  56         if (en)
  57                 val |= BCM63138_CTLRDY;
  58         else
  59                 val &= ~BCM63138_CTLRDY;
  60
  61         brcmnand_writel(val, mmio);
  62 }
  63
  64 static int bcm63138_nand_probe(struct platform_device *pdev)
  65 {
  66         struct device *dev = &pdev->dev;
  67         struct bcm63138_nand_soc_priv *priv;
  68         struct brcmnand_soc *soc;
  69         struct resource *res;
  70
  71         soc = devm_kzalloc(dev, sizeof(*soc), GFP_KERNEL);
  72         if (!soc)
  73                 return -ENOMEM;
  74
  75         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
  76         if (!priv)
  77                 return -ENOMEM;
  78
  79         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand-int-base");
  80         priv->base = devm_ioremap_resource(dev, res);
  81         if (IS_ERR(priv->base))
  82                 return PTR_ERR(priv->base);
  83
  84         soc->pdev = pdev;
  85         soc->priv = priv;
  86         soc->ctlrdy_ack = bcm63138_nand_intc_ack;
  87         soc->ctlrdy_set_enabled = bcm63138_nand_intc_set;
  88
  89         return brcmnand_probe(pdev, soc);
  90 }
  91
  92 static const struct of_device_id bcm63138_nand_of_match[] = {
  93         { .compatible = "brcm,nand-bcm63138" },
  94         {},
  95 };
  96 MODULE_DEVICE_TABLE(of, bcm63138_nand_of_match);
  97
  98 static struct platform_driver bcm63138_nand_driver = {
  99         .probe                  = bcm63138_nand_probe,
 100         .remove                 = brcmnand_remove,
 101         .driver = {
 102                 .name           = "bcm63138_nand",
 103                 .pm             = &brcmnand_pm_ops,
 104                 .of_match_table = bcm63138_nand_of_match,
 105         }
 106 };
 107 module_platform_driver(bcm63138_nand_driver);
 108
 109 MODULE_LICENSE("GPL v2");
 110 MODULE_AUTHOR("Brian Norris");
 111 MODULE_DESCRIPTION("NAND driver for BCM63138");