include/linux/moxtet.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Turris Mox module configuration bus driver
   4  *
   5  * Copyright (C) 2019 Marek Behún <kabel@kernel.org>
   6  */
   7
   8 #ifndef __LINUX_MOXTET_H
   9 #define __LINUX_MOXTET_H
  10
  11 #include <linux/device.h>
  12 #include <linux/irq.h>
  13 #include <linux/irqdomain.h>
  14 #include <linux/mutex.h>
  15
  16 #define TURRIS_MOX_MAX_MODULES  10
  17
  18 enum turris_mox_cpu_module_id {
  19         TURRIS_MOX_CPU_ID_EMMC  = 0x00,
  20         TURRIS_MOX_CPU_ID_SD    = 0x10,
  21 };
  22
  23 enum turris_mox_module_id {
  24         TURRIS_MOX_MODULE_FIRST         = 0x01,
  25
  26         TURRIS_MOX_MODULE_SFP           = 0x01,
  27         TURRIS_MOX_MODULE_PCI           = 0x02,
  28         TURRIS_MOX_MODULE_TOPAZ         = 0x03,
  29         TURRIS_MOX_MODULE_PERIDOT       = 0x04,
  30         TURRIS_MOX_MODULE_USB3          = 0x05,
  31         TURRIS_MOX_MODULE_PCI_BRIDGE    = 0x06,
  32
  33         TURRIS_MOX_MODULE_LAST          = 0x06,
  34 };
  35
  36 #define MOXTET_NIRQS    16
  37
  38 extern struct bus_type moxtet_type;
  39
  40 struct moxtet {
  41         struct device                   *dev;
  42         struct mutex                    lock;
  43         u8                              modules[TURRIS_MOX_MAX_MODULES];
  44         int                             count;
  45         u8                              tx[TURRIS_MOX_MAX_MODULES];
  46         int                             dev_irq;
  47         struct {
  48                 struct irq_domain       *domain;
  49                 struct irq_chip         chip;
  50                 unsigned long           masked, exists;
  51                 struct moxtet_irqpos {
  52                                         u8 idx;
  53                                         u8 bit;
  54                 } position[MOXTET_NIRQS];
  55         } irq;
  56 #ifdef CONFIG_DEBUG_FS
  57         struct dentry                   *debugfs_root;
  58 #endif
  59 };
  60
  61 struct moxtet_driver {
  62         const enum turris_mox_module_id *id_table;
  63         struct device_driver            driver;
  64 };
  65
  66 static inline struct moxtet_driver *
  67 to_moxtet_driver(struct device_driver *drv)
  68 {
  69         if (!drv)
  70                 return NULL;
  71         return container_of(drv, struct moxtet_driver, driver);
  72 }
  73
  74 extern int __moxtet_register_driver(struct module *owner,
  75                                     struct moxtet_driver *mdrv);
  76
  77 static inline void moxtet_unregister_driver(struct moxtet_driver *mdrv)
  78 {
  79         if (mdrv)
  80                 driver_unregister(&mdrv->driver);
  81 }
  82
  83 #define moxtet_register_driver(driver) \
  84         __moxtet_register_driver(THIS_MODULE, driver)
  85
  86 #define module_moxtet_driver(__moxtet_driver) \
  87         module_driver(__moxtet_driver, moxtet_register_driver, \
  88                         moxtet_unregister_driver)
  89
  90 struct moxtet_device {
  91         struct device                   dev;
  92         struct moxtet                   *moxtet;
  93         enum turris_mox_module_id       id;
  94         unsigned int                    idx;
  95 };
  96
  97 extern int moxtet_device_read(struct device *dev);
  98 extern int moxtet_device_write(struct device *dev, u8 val);
  99 extern int moxtet_device_written(struct device *dev);
 100
 101 static inline struct moxtet_device *
 102 to_moxtet_device(struct device *dev)
 103 {
 104         if (!dev)
 105                 return NULL;
 106         return container_of(dev, struct moxtet_device, dev);
 107 }
 108
 109 #endif /* __LINUX_MOXTET_H */