Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * linux/include/amba/bus.h
4 *
5 * This device type deals with ARM PrimeCells and anything else that
6 * presents a proper CID (0xB105F00D) at the end of the I/O register
7 * region or that is derived from a PrimeCell.
8 *
9 * Copyright (C) 2003 Deep Blue Solutions Ltd, All Rights Reserved.
10 */
11#ifndef ASMARM_AMBA_H
12#define ASMARM_AMBA_H
13
14#include <linux/clk.h>
15#include <linux/device.h>
16#include <linux/mod_devicetable.h>
17#include <linux/err.h>
18#include <linux/resource.h>
19#include <linux/regulator/consumer.h>
20
21#define AMBA_NR_IRQS 9
22#define AMBA_CID 0xb105f00d
23#define CORESIGHT_CID 0xb105900d
24
25/*
26 * CoreSight Architecture specification updates the ID specification
27 * for components on the AMBA bus. (ARM IHI 0029E)
28 *
29 * Bits 15:12 of the CID are the device class.
30 *
31 * Class 0xF remains for PrimeCell and legacy components. (AMBA_CID above)
32 * Class 0x9 defines the component as CoreSight (CORESIGHT_CID above)
33 * Class 0x0, 0x1, 0xB, 0xE define components that do not have driver support
34 * at present.
35 * Class 0x2-0x8,0xA and 0xD-0xD are presently reserved.
36 *
37 * Remaining CID bits stay as 0xb105-00d
38 */
39
40/**
41 * Class 0x9 components use additional values to form a Unique Component
42 * Identifier (UCI), where peripheral ID values are identical for different
43 * components. Passed to the amba bus code from the component driver via
44 * the amba_id->data pointer.
45 * @devarch : coresight devarch register value
46 * @devarch_mask: mask bits used for matching. 0 indicates UCI not used.
47 * @devtype : coresight device type value
48 * @data : additional driver data. As we have usurped the original
49 * pointer some devices may still need additional data
50 */
51struct amba_cs_uci_id {
52 unsigned int devarch;
53 unsigned int devarch_mask;
54 unsigned int devtype;
55 void *data;
56};
57
58/* define offsets for registers used by UCI */
59#define UCI_REG_DEVTYPE_OFFSET 0xFCC
60#define UCI_REG_DEVARCH_OFFSET 0xFBC
61
62struct clk;
63
64struct amba_device {
65 struct device dev;
66 struct resource res;
67 struct clk *pclk;
68 struct device_dma_parameters dma_parms;
69 unsigned int periphid;
70 struct mutex periphid_lock;
71 unsigned int cid;
72 struct amba_cs_uci_id uci;
73 unsigned int irq[AMBA_NR_IRQS];
74 /*
75 * Driver name to force a match. Do not set directly, because core
76 * frees it. Use driver_set_override() to set or clear it.
77 */
78 const char *driver_override;
79};
80
81struct amba_driver {
82 struct device_driver drv;
83 int (*probe)(struct amba_device *, const struct amba_id *);
84 void (*remove)(struct amba_device *);
85 void (*shutdown)(struct amba_device *);
86 const struct amba_id *id_table;
87 /*
88 * For most device drivers, no need to care about this flag as long as
89 * all DMAs are handled through the kernel DMA API. For some special
90 * ones, for example VFIO drivers, they know how to manage the DMA
91 * themselves and set this flag so that the IOMMU layer will allow them
92 * to setup and manage their own I/O address space.
93 */
94 bool driver_managed_dma;
95};
96
97/*
98 * Constants for the designer field of the Peripheral ID register. When bit 7
99 * is set to '1', bits [6:0] should be the JEP106 manufacturer identity code.
100 */
101enum amba_vendor {
102 AMBA_VENDOR_ARM = 0x41,
103 AMBA_VENDOR_ST = 0x80,
104 AMBA_VENDOR_QCOM = 0x51,
105 AMBA_VENDOR_LSI = 0xb6,
106};
107
108extern const struct bus_type amba_bustype;
109
110#define to_amba_device(d) container_of_const(d, struct amba_device, dev)
111
112#define amba_get_drvdata(d) dev_get_drvdata(&d->dev)
113#define amba_set_drvdata(d,p) dev_set_drvdata(&d->dev, p)
114
115/*
116 * use a macro to avoid include chaining to get THIS_MODULE
117 */
118#define amba_driver_register(drv) \
119 __amba_driver_register(drv, THIS_MODULE)
120
121#ifdef CONFIG_ARM_AMBA
122int __amba_driver_register(struct amba_driver *, struct module *);
123void amba_driver_unregister(struct amba_driver *);
124bool dev_is_amba(const struct device *dev);
125#else
126static inline int __amba_driver_register(struct amba_driver *drv,
127 struct module *owner)
128{
129 return -EINVAL;
130}
131static inline void amba_driver_unregister(struct amba_driver *drv)
132{
133}
134static inline bool dev_is_amba(const struct device *dev)
135{
136 return false;
137}
138#endif
139
140struct amba_device *amba_device_alloc(const char *, resource_size_t, size_t);
141void amba_device_put(struct amba_device *);
142int amba_device_add(struct amba_device *, struct resource *);
143int amba_device_register(struct amba_device *, struct resource *);
144void amba_device_unregister(struct amba_device *);
145int amba_request_regions(struct amba_device *, const char *);
146void amba_release_regions(struct amba_device *);
147
148/* Some drivers don't use the struct amba_device */
149#define AMBA_CONFIG_BITS(a) (((a) >> 24) & 0xff)
150#define AMBA_REV_BITS(a) (((a) >> 20) & 0x0f)
151#define AMBA_MANF_BITS(a) (((a) >> 12) & 0xff)
152#define AMBA_PART_BITS(a) ((a) & 0xfff)
153
154#define amba_config(d) AMBA_CONFIG_BITS((d)->periphid)
155#define amba_rev(d) AMBA_REV_BITS((d)->periphid)
156#define amba_manf(d) AMBA_MANF_BITS((d)->periphid)
157#define amba_part(d) AMBA_PART_BITS((d)->periphid)
158
159#define __AMBA_DEV(busid, data, mask) \
160 { \
161 .coherent_dma_mask = mask, \
162 .init_name = busid, \
163 .platform_data = data, \
164 }
165
166/*
167 * APB devices do not themselves have the ability to address memory,
168 * so DMA masks should be zero (much like USB peripheral devices.)
169 * The DMA controller DMA masks should be used instead (much like
170 * USB host controllers in conventional PCs.)
171 */
172#define AMBA_APB_DEVICE(name, busid, id, base, irqs, data) \
173struct amba_device name##_device = { \
174 .dev = __AMBA_DEV(busid, data, 0), \
175 .res = DEFINE_RES_MEM(base, SZ_4K), \
176 .irq = irqs, \
177 .periphid = id, \
178}
179
180/*
181 * AHB devices are DMA capable, so set their DMA masks
182 */
183#define AMBA_AHB_DEVICE(name, busid, id, base, irqs, data) \
184struct amba_device name##_device = { \
185 .dev = __AMBA_DEV(busid, data, ~0ULL), \
186 .res = DEFINE_RES_MEM(base, SZ_4K), \
187 .irq = irqs, \
188 .periphid = id, \
189}
190
191/*
192 * module_amba_driver() - Helper macro for drivers that don't do anything
193 * special in module init/exit. This eliminates a lot of boilerplate. Each
194 * module may only use this macro once, and calling it replaces module_init()
195 * and module_exit()
196 */
197#define module_amba_driver(__amba_drv) \
198 module_driver(__amba_drv, amba_driver_register, amba_driver_unregister)
199
200/*
201 * builtin_amba_driver() - Helper macro for drivers that don't do anything
202 * special in driver initcall. This eliminates a lot of boilerplate. Each
203 * driver may only use this macro once, and calling it replaces the instance
204 * device_initcall().
205 */
206#define builtin_amba_driver(__amba_drv) \
207 builtin_driver(__amba_drv, amba_driver_register)
208
209#endif