include/linux/amba/bus.h

   1 /*
   2  *  linux/include/amba/bus.h
   3  *
   4  *  This device type deals with ARM PrimeCells and anything else that
   5  *  presents a proper CID (0xB105F00D) at the end of the I/O register
   6  *  region or that is derived from a PrimeCell.
   7  *
   8  *  Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14 #ifndef ASMARM_AMBA_H
  15 #define ASMARM_AMBA_H
  16
  17 #include <linux/clk.h>
  18 #include <linux/device.h>
  19 #include <linux/mod_devicetable.h>
  20 #include <linux/err.h>
  21 #include <linux/resource.h>
  22 #include <linux/regulator/consumer.h>
  23
  24 #define AMBA_NR_IRQS    2
  25 #define AMBA_CID        0xb105f00d
  26
  27 struct clk;
  28
  29 struct amba_device {
  30         struct device           dev;
  31         struct resource         res;
  32         struct clk              *pclk;
  33         u64                     dma_mask;
  34         unsigned int            periphid;
  35         unsigned int            irq[AMBA_NR_IRQS];
  36 };
  37
  38 struct amba_driver {
  39         struct device_driver    drv;
  40         int                     (*probe)(struct amba_device *, const struct amba_id *);
  41         int                     (*remove)(struct amba_device *);
  42         void                    (*shutdown)(struct amba_device *);
  43         int                     (*suspend)(struct amba_device *, pm_message_t);
  44         int                     (*resume)(struct amba_device *);
  45         const struct amba_id    *id_table;
  46 };
  47
  48 enum amba_vendor {
  49         AMBA_VENDOR_ARM = 0x41,
  50         AMBA_VENDOR_ST = 0x80,
  51 };
  52
  53 extern struct bus_type amba_bustype;
  54
  55 #define to_amba_device(d)       container_of(d, struct amba_device, dev)
  56
  57 #define amba_get_drvdata(d)     dev_get_drvdata(&d->dev)
  58 #define amba_set_drvdata(d,p)   dev_set_drvdata(&d->dev, p)
  59
  60 int amba_driver_register(struct amba_driver *);
  61 void amba_driver_unregister(struct amba_driver *);
  62 struct amba_device *amba_device_alloc(const char *, resource_size_t, size_t);
  63 void amba_device_put(struct amba_device *);
  64 int amba_device_add(struct amba_device *, struct resource *);
  65 int amba_device_register(struct amba_device *, struct resource *);
  66 struct amba_device *amba_apb_device_add(struct device *parent, const char *name,
  67                                         resource_size_t base, size_t size,
  68                                         int irq1, int irq2, void *pdata,
  69                                         unsigned int periphid);
  70 struct amba_device *amba_ahb_device_add(struct device *parent, const char *name,
  71                                         resource_size_t base, size_t size,
  72                                         int irq1, int irq2, void *pdata,
  73                                         unsigned int periphid);
  74 void amba_device_unregister(struct amba_device *);
  75 struct amba_device *amba_find_device(const char *, struct device *, unsigned int, unsigned int);
  76 int amba_request_regions(struct amba_device *, const char *);
  77 void amba_release_regions(struct amba_device *);
  78
  79 #define amba_pclk_enable(d)     \
  80         (IS_ERR((d)->pclk) ? 0 : clk_enable((d)->pclk))
  81
  82 #define amba_pclk_disable(d)    \
  83         do { if (!IS_ERR((d)->pclk)) clk_disable((d)->pclk); } while (0)
  84
  85 /* Some drivers don't use the struct amba_device */
  86 #define AMBA_CONFIG_BITS(a) (((a) >> 24) & 0xff)
  87 #define AMBA_REV_BITS(a) (((a) >> 20) & 0x0f)
  88 #define AMBA_MANF_BITS(a) (((a) >> 12) & 0xff)
  89 #define AMBA_PART_BITS(a) ((a) & 0xfff)
  90
  91 #define amba_config(d)  AMBA_CONFIG_BITS((d)->periphid)
  92 #define amba_rev(d)     AMBA_REV_BITS((d)->periphid)
  93 #define amba_manf(d)    AMBA_MANF_BITS((d)->periphid)
  94 #define amba_part(d)    AMBA_PART_BITS((d)->periphid)
  95
  96 #define __AMBA_DEV(busid, data, mask)                           \
  97         {                                                       \
  98                 .coherent_dma_mask = mask,                      \
  99                 .init_name = busid,                             \
 100                 .platform_data = data,                          \
 101         }
 102
 103 /*
 104  * APB devices do not themselves have the ability to address memory,
 105  * so DMA masks should be zero (much like USB peripheral devices.)
 106  * The DMA controller DMA masks should be used instead (much like
 107  * USB host controllers in conventional PCs.)
 108  */
 109 #define AMBA_APB_DEVICE(name, busid, id, base, irqs, data)      \
 110 struct amba_device name##_device = {                            \
 111         .dev = __AMBA_DEV(busid, data, 0),                      \
 112         .res = DEFINE_RES_MEM(base, SZ_4K),                     \
 113         .irq = irqs,                                            \
 114         .periphid = id,                                         \
 115 }
 116
 117 /*
 118  * AHB devices are DMA capable, so set their DMA masks
 119  */
 120 #define AMBA_AHB_DEVICE(name, busid, id, base, irqs, data)      \
 121 struct amba_device name##_device = {                            \
 122         .dev = __AMBA_DEV(busid, data, ~0ULL),                  \
 123         .res = DEFINE_RES_MEM(base, SZ_4K),                     \
 124         .dma_mask = ~0ULL,                                      \
 125         .irq = irqs,                                            \
 126         .periphid = id,                                         \
 127 }
 128
 129 /*
 130  * module_amba_driver() - Helper macro for drivers that don't do anything
 131  * special in module init/exit.  This eliminates a lot of boilerplate.  Each
 132  * module may only use this macro once, and calling it replaces module_init()
 133  * and module_exit()
 134  */
 135 #define module_amba_driver(__amba_drv) \
 136         module_driver(__amba_drv, amba_driver_register, amba_driver_unregister)
 137
 138 #endif