kernel/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 {
  26         struct brcmnand_soc soc;
  27         void __iomem *base;
  28 };
  29
  30 #define BCM63138_NAND_INT_STATUS                0x00
  31 #define BCM63138_NAND_INT_EN                    0x04
  32
  33 enum {
  34         BCM63138_CTLRDY         = BIT(4),
  35 };
  36
  37 static bool bcm63138_nand_intc_ack(struct brcmnand_soc *soc)
  38 {
  39         struct bcm63138_nand_soc *priv =
  40                         container_of(soc, struct bcm63138_nand_soc, soc);
  41         void __iomem *mmio = priv->base + BCM63138_NAND_INT_STATUS;
  42         u32 val = brcmnand_readl(mmio);
  43
  44         if (val & BCM63138_CTLRDY) {
  45                 brcmnand_writel(val & ~BCM63138_CTLRDY, mmio);
  46                 return true;
  47         }
  48
  49         return false;
  50 }
  51
  52 static void bcm63138_nand_intc_set(struct brcmnand_soc *soc, bool en)
  53 {
  54         struct bcm63138_nand_soc *priv =
  55                         container_of(soc, struct bcm63138_nand_soc, soc);
  56         void __iomem *mmio = priv->base + BCM63138_NAND_INT_EN;
  57         u32 val = brcmnand_readl(mmio);
  58
  59         if (en)
  60                 val |= BCM63138_CTLRDY;
  61         else
  62                 val &= ~BCM63138_CTLRDY;
  63
  64         brcmnand_writel(val, mmio);
  65 }
  66
  67 static int bcm63138_nand_probe(struct platform_device *pdev)
  68 {
  69         struct device *dev = &pdev->dev;
  70         struct bcm63138_nand_soc *priv;
  71         struct brcmnand_soc *soc;
  72         struct resource *res;
  73
  74         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
  75         if (!priv)
  76                 return -ENOMEM;
  77         soc = &priv->soc;
  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->ctlrdy_ack = bcm63138_nand_intc_ack;
  85         soc->ctlrdy_set_enabled = bcm63138_nand_intc_set;
  86
  87         return brcmnand_probe(pdev, soc);
  88 }
  89
  90 static const struct of_device_id bcm63138_nand_of_match[] = {
  91         { .compatible = "brcm,nand-bcm63138" },
  92         {},
  93 };
  94 MODULE_DEVICE_TABLE(of, bcm63138_nand_of_match);
  95
  96 static struct platform_driver bcm63138_nand_driver = {
  97         .probe                  = bcm63138_nand_probe,
  98         .remove                 = brcmnand_remove,
  99         .driver = {
 100                 .name           = "bcm63138_nand",
 101                 .pm             = &brcmnand_pm_ops,
 102                 .of_match_table = bcm63138_nand_of_match,
 103         }
 104 };
 105 module_platform_driver(bcm63138_nand_driver);
 106
 107 MODULE_LICENSE("GPL v2");
 108 MODULE_AUTHOR("Brian Norris");
 109 MODULE_DESCRIPTION("NAND driver for BCM63138");