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 {
  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
  33enum {
  34        BCM63138_CTLRDY         = BIT(4),
  35};
  36
  37static 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
  52static 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
  67static 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
  90static const struct of_device_id bcm63138_nand_of_match[] = {
  91        { .compatible = "brcm,nand-bcm63138" },
  92        {},
  93};
  94MODULE_DEVICE_TABLE(of, bcm63138_nand_of_match);
  95
  96static 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};
 105module_platform_driver(bcm63138_nand_driver);
 106
 107MODULE_LICENSE("GPL v2");
 108MODULE_AUTHOR("Brian Norris");
 109MODULE_DESCRIPTION("NAND driver for BCM63138");
 110