LXR linux/drivers/mtd/nand/brcmnand/bcm63138

   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
  25struct 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
  32enum {
  33        BCM63138_CTLRDY         = BIT(4),
  34};
  35
  36static 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
  50static 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
  64static 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
  92static const struct of_device_id bcm63138_nand_of_match[] = {
  93        { .compatible = "brcm,nand-bcm63138" },
  94        {},
  95};
  96MODULE_DEVICE_TABLE(of, bcm63138_nand_of_match);
  97
  98static 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};
 107module_platform_driver(bcm63138_nand_driver);
 108
 109MODULE_LICENSE("GPL v2");
 110MODULE_AUTHOR("Brian Norris");
 111MODULE_DESCRIPTION("NAND driver for BCM63138");
 112