drivers/mtd/nand/brcmnand/brcmnand.h

   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 #ifndef __BRCMNAND_H__
  15 #define __BRCMNAND_H__
  16
  17 #include <linux/types.h>
  18 #include <linux/io.h>
  19
  20 struct platform_device;
  21 struct dev_pm_ops;
  22
  23 struct brcmnand_soc {
  24         bool (*ctlrdy_ack)(struct brcmnand_soc *soc);
  25         void (*ctlrdy_set_enabled)(struct brcmnand_soc *soc, bool en);
  26         void (*prepare_data_bus)(struct brcmnand_soc *soc, bool prepare);
  27 };
  28
  29 static inline void brcmnand_soc_data_bus_prepare(struct brcmnand_soc *soc)
  30 {
  31         if (soc && soc->prepare_data_bus)
  32                 soc->prepare_data_bus(soc, true);
  33 }
  34
  35 static inline void brcmnand_soc_data_bus_unprepare(struct brcmnand_soc *soc)
  36 {
  37         if (soc && soc->prepare_data_bus)
  38                 soc->prepare_data_bus(soc, false);
  39 }
  40
  41 static inline u32 brcmnand_readl(void __iomem *addr)
  42 {
  43         /*
  44          * MIPS endianness is configured by boot strap, which also reverses all
  45          * bus endianness (i.e., big-endian CPU + big endian bus ==> native
  46          * endian I/O).
  47          *
  48          * Other architectures (e.g., ARM) either do not support big endian, or
  49          * else leave I/O in little endian mode.
  50          */
  51         if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
  52                 return __raw_readl(addr);
  53         else
  54                 return readl_relaxed(addr);
  55 }
  56
  57 static inline void brcmnand_writel(u32 val, void __iomem *addr)
  58 {
  59         /* See brcmnand_readl() comments */
  60         if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
  61                 __raw_writel(val, addr);
  62         else
  63                 writel_relaxed(val, addr);
  64 }
  65
  66 int brcmnand_probe(struct platform_device *pdev, struct brcmnand_soc *soc);
  67 int brcmnand_remove(struct platform_device *pdev);
  68
  69 extern const struct dev_pm_ops brcmnand_pm_ops;
  70
  71 #endif /* __BRCMNAND_H__ */