drivers/mtd/nand/brcmnand/iproc_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 iproc_nand_soc {
  26         struct brcmnand_soc soc;
  27
  28         void __iomem *idm_base;
  29         void __iomem *ext_base;
  30         spinlock_t idm_lock;
  31 };
  32
  33 #define IPROC_NAND_CTLR_READY_OFFSET       0x10
  34 #define IPROC_NAND_CTLR_READY              BIT(0)
  35
  36 #define IPROC_NAND_IO_CTRL_OFFSET          0x00
  37 #define IPROC_NAND_APB_LE_MODE             BIT(24)
  38 #define IPROC_NAND_INT_CTRL_READ_ENABLE    BIT(6)
  39
  40 static bool iproc_nand_intc_ack(struct brcmnand_soc *soc)
  41 {
  42         struct iproc_nand_soc *priv =
  43                         container_of(soc, struct iproc_nand_soc, soc);
  44         void __iomem *mmio = priv->ext_base + IPROC_NAND_CTLR_READY_OFFSET;
  45         u32 val = brcmnand_readl(mmio);
  46
  47         if (val & IPROC_NAND_CTLR_READY) {
  48                 brcmnand_writel(IPROC_NAND_CTLR_READY, mmio);
  49                 return true;
  50         }
  51
  52         return false;
  53 }
  54
  55 static void iproc_nand_intc_set(struct brcmnand_soc *soc, bool en)
  56 {
  57         struct iproc_nand_soc *priv =
  58                         container_of(soc, struct iproc_nand_soc, soc);
  59         void __iomem *mmio = priv->idm_base + IPROC_NAND_IO_CTRL_OFFSET;
  60         u32 val;
  61         unsigned long flags;
  62
  63         spin_lock_irqsave(&priv->idm_lock, flags);
  64
  65         val = brcmnand_readl(mmio);
  66
  67         if (en)
  68                 val |= IPROC_NAND_INT_CTRL_READ_ENABLE;
  69         else
  70                 val &= ~IPROC_NAND_INT_CTRL_READ_ENABLE;
  71
  72         brcmnand_writel(val, mmio);
  73
  74         spin_unlock_irqrestore(&priv->idm_lock, flags);
  75 }
  76
  77 static void iproc_nand_apb_access(struct brcmnand_soc *soc, bool prepare)
  78 {
  79         struct iproc_nand_soc *priv =
  80                         container_of(soc, struct iproc_nand_soc, soc);
  81         void __iomem *mmio = priv->idm_base + IPROC_NAND_IO_CTRL_OFFSET;
  82         u32 val;
  83         unsigned long flags;
  84
  85         spin_lock_irqsave(&priv->idm_lock, flags);
  86
  87         val = brcmnand_readl(mmio);
  88
  89         if (prepare)
  90                 val |= IPROC_NAND_APB_LE_MODE;
  91         else
  92                 val &= ~IPROC_NAND_APB_LE_MODE;
  93
  94         brcmnand_writel(val, mmio);
  95
  96         spin_unlock_irqrestore(&priv->idm_lock, flags);
  97 }
  98
  99 static int iproc_nand_probe(struct platform_device *pdev)
 100 {
 101         struct device *dev = &pdev->dev;
 102         struct iproc_nand_soc *priv;
 103         struct brcmnand_soc *soc;
 104         struct resource *res;
 105
 106         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 107         if (!priv)
 108                 return -ENOMEM;
 109         soc = &priv->soc;
 110
 111         spin_lock_init(&priv->idm_lock);
 112
 113         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "iproc-idm");
 114         priv->idm_base = devm_ioremap_resource(dev, res);
 115         if (IS_ERR(priv->idm_base))
 116                 return PTR_ERR(priv->idm_base);
 117
 118         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "iproc-ext");
 119         priv->ext_base = devm_ioremap_resource(dev, res);
 120         if (IS_ERR(priv->ext_base))
 121                 return PTR_ERR(priv->ext_base);
 122
 123         soc->ctlrdy_ack = iproc_nand_intc_ack;
 124         soc->ctlrdy_set_enabled = iproc_nand_intc_set;
 125         soc->prepare_data_bus = iproc_nand_apb_access;
 126
 127         return brcmnand_probe(pdev, soc);
 128 }
 129
 130 static const struct of_device_id iproc_nand_of_match[] = {
 131         { .compatible = "brcm,nand-iproc" },
 132         {},
 133 };
 134 MODULE_DEVICE_TABLE(of, iproc_nand_of_match);
 135
 136 static struct platform_driver iproc_nand_driver = {
 137         .probe                  = iproc_nand_probe,
 138         .remove                 = brcmnand_remove,
 139         .driver = {
 140                 .name           = "iproc_nand",
 141                 .pm             = &brcmnand_pm_ops,
 142                 .of_match_table = iproc_nand_of_match,
 143         }
 144 };
 145 module_platform_driver(iproc_nand_driver);
 146
 147 MODULE_LICENSE("GPL v2");
 148 MODULE_AUTHOR("Brian Norris");
 149 MODULE_AUTHOR("Ray Jui");
 150 MODULE_DESCRIPTION("NAND driver for Broadcom IPROC-based SoCs");