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_priv {
  26         void __iomem *idm_base;
  27         void __iomem *ext_base;
  28         spinlock_t idm_lock;
  29 };
  30
  31 #define IPROC_NAND_CTLR_READY_OFFSET       0x10
  32 #define IPROC_NAND_CTLR_READY              BIT(0)
  33
  34 #define IPROC_NAND_IO_CTRL_OFFSET          0x00
  35 #define IPROC_NAND_APB_LE_MODE             BIT(24)
  36 #define IPROC_NAND_INT_CTRL_READ_ENABLE    BIT(6)
  37
  38 static bool iproc_nand_intc_ack(struct brcmnand_soc *soc)
  39 {
  40         struct iproc_nand_soc_priv *priv = soc->priv;
  41         void __iomem *mmio = priv->ext_base + IPROC_NAND_CTLR_READY_OFFSET;
  42         u32 val = brcmnand_readl(mmio);
  43
  44         if (val & IPROC_NAND_CTLR_READY) {
  45                 brcmnand_writel(IPROC_NAND_CTLR_READY, mmio);
  46                 return true;
  47         }
  48
  49         return false;
  50 }
  51
  52 static void iproc_nand_intc_set(struct brcmnand_soc *soc, bool en)
  53 {
  54         struct iproc_nand_soc_priv *priv = soc->priv;
  55         void __iomem *mmio = priv->idm_base + IPROC_NAND_IO_CTRL_OFFSET;
  56         u32 val;
  57         unsigned long flags;
  58
  59         spin_lock_irqsave(&priv->idm_lock, flags);
  60
  61         val = brcmnand_readl(mmio);
  62
  63         if (en)
  64                 val |= IPROC_NAND_INT_CTRL_READ_ENABLE;
  65         else
  66                 val &= ~IPROC_NAND_INT_CTRL_READ_ENABLE;
  67
  68         brcmnand_writel(val, mmio);
  69
  70         spin_unlock_irqrestore(&priv->idm_lock, flags);
  71 }
  72
  73 static void iproc_nand_apb_access(struct brcmnand_soc *soc, bool prepare)
  74 {
  75         struct iproc_nand_soc_priv *priv = soc->priv;
  76         void __iomem *mmio = priv->idm_base + IPROC_NAND_IO_CTRL_OFFSET;
  77         u32 val;
  78         unsigned long flags;
  79
  80         spin_lock_irqsave(&priv->idm_lock, flags);
  81
  82         val = brcmnand_readl(mmio);
  83
  84         if (prepare)
  85                 val |= IPROC_NAND_APB_LE_MODE;
  86         else
  87                 val &= ~IPROC_NAND_APB_LE_MODE;
  88
  89         brcmnand_writel(val, mmio);
  90
  91         spin_unlock_irqrestore(&priv->idm_lock, flags);
  92 }
  93
  94 static int iproc_nand_probe(struct platform_device *pdev)
  95 {
  96         struct device *dev = &pdev->dev;
  97         struct iproc_nand_soc_priv *priv;
  98         struct brcmnand_soc *soc;
  99         struct resource *res;
 100
 101         soc = devm_kzalloc(dev, sizeof(*soc), GFP_KERNEL);
 102         if (!soc)
 103                 return -ENOMEM;
 104
 105         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 106         if (!priv)
 107                 return -ENOMEM;
 108
 109         spin_lock_init(&priv->idm_lock);
 110
 111         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "iproc-idm");
 112         priv->idm_base = devm_ioremap_resource(dev, res);
 113         if (IS_ERR(priv->idm_base))
 114                 return PTR_ERR(priv->idm_base);
 115
 116         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "iproc-ext");
 117         priv->ext_base = devm_ioremap_resource(dev, res);
 118         if (IS_ERR(priv->ext_base))
 119                 return PTR_ERR(priv->ext_base);
 120
 121         soc->pdev = pdev;
 122         soc->priv = priv;
 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");