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 struct moxtet {
  39         struct device                   *dev;
  40         struct mutex                    lock;
  41         u8                              modules[TURRIS_MOX_MAX_MODULES];
  42         int                             count;
  43         u8                              tx[TURRIS_MOX_MAX_MODULES];
  44         int                             dev_irq;
  45         struct {
  46                 struct irq_domain       *domain;
  47                 struct irq_chip         chip;
  48                 unsigned long           masked, exists;
  49                 struct moxtet_irqpos {
  50                                         u8 idx;
  51                                         u8 bit;
  52                 } position[MOXTET_NIRQS];
  53         } irq;
  54 #ifdef CONFIG_DEBUG_FS
  55         struct dentry                   *debugfs_root;
  56 #endif
  57 };
  58
  59 struct moxtet_driver {
  60         const enum turris_mox_module_id *id_table;
  61         struct device_driver            driver;
  62 };
  63
  64 #define to_moxtet_driver(__drv) \
  65         ( __drv ? container_of_const(__drv, struct moxtet_driver, driver) : NULL )
  66
  67 extern int __moxtet_register_driver(struct module *owner,
  68                                     struct moxtet_driver *mdrv);
  69
  70 static inline void moxtet_unregister_driver(struct moxtet_driver *mdrv)
  71 {
  72         if (mdrv)
  73                 driver_unregister(&mdrv->driver);
  74 }
  75
  76 #define moxtet_register_driver(driver) \
  77         __moxtet_register_driver(THIS_MODULE, driver)
  78
  79 #define module_moxtet_driver(__moxtet_driver) \
  80         module_driver(__moxtet_driver, moxtet_register_driver, \
  81                         moxtet_unregister_driver)
  82
  83 struct moxtet_device {
  84         struct device                   dev;
  85         struct moxtet                   *moxtet;
  86         enum turris_mox_module_id       id;
  87         unsigned int                    idx;
  88 };
  89
  90 extern int moxtet_device_read(struct device *dev);
  91 extern int moxtet_device_write(struct device *dev, u8 val);
  92 extern int moxtet_device_written(struct device *dev);
  93
  94 static inline struct moxtet_device *
  95 to_moxtet_device(struct device *dev)
  96 {
  97         if (!dev)
  98                 return NULL;
  99         return container_of(dev, struct moxtet_device, dev);
 100 }
 101
 102 #endif /* __LINUX_MOXTET_H */