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 */ 51 struct 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 62 struct clk; 63 64 struct 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 81 struct 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 */ 101 enum amba_vendor { 102 AMBA_VENDOR_ARM = 0x41, 103 AMBA_VENDOR_ST = 0x80, 104 AMBA_VENDOR_QCOM = 0x51, 105 AMBA_VENDOR_LSI = 0xb6, 106 }; 107 108 extern struct bus_type amba_bustype; 109 110 #define to_amba_device(d) container_of(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 #ifdef CONFIG_ARM_AMBA 116 int amba_driver_register(struct amba_driver *); 117 void amba_driver_unregister(struct amba_driver *); 118 #else 119 static inline int amba_driver_register(struct amba_driver *drv) 120 { 121 return -EINVAL; 122 } 123 static inline void amba_driver_unregister(struct amba_driver *drv) 124 { 125 } 126 #endif 127 128 struct amba_device *amba_device_alloc(const char *, resource_size_t, size_t); 129 void amba_device_put(struct amba_device *); 130 int amba_device_add(struct amba_device *, struct resource *); 131 int amba_device_register(struct amba_device *, struct resource *); 132 void amba_device_unregister(struct amba_device *); 133 int amba_request_regions(struct amba_device *, const char *); 134 void amba_release_regions(struct amba_device *); 135 136 /* Some drivers don't use the struct amba_device */ 137 #define AMBA_CONFIG_BITS(a) (((a) >> 24) & 0xff) 138 #define AMBA_REV_BITS(a) (((a) >> 20) & 0x0f) 139 #define AMBA_MANF_BITS(a) (((a) >> 12) & 0xff) 140 #define AMBA_PART_BITS(a) ((a) & 0xfff) 141 142 #define amba_config(d) AMBA_CONFIG_BITS((d)->periphid) 143 #define amba_rev(d) AMBA_REV_BITS((d)->periphid) 144 #define amba_manf(d) AMBA_MANF_BITS((d)->periphid) 145 #define amba_part(d) AMBA_PART_BITS((d)->periphid) 146 147 #define __AMBA_DEV(busid, data, mask) \ 148 { \ 149 .coherent_dma_mask = mask, \ 150 .init_name = busid, \ 151 .platform_data = data, \ 152 } 153 154 /* 155 * APB devices do not themselves have the ability to address memory, 156 * so DMA masks should be zero (much like USB peripheral devices.) 157 * The DMA controller DMA masks should be used instead (much like 158 * USB host controllers in conventional PCs.) 159 */ 160 #define AMBA_APB_DEVICE(name, busid, id, base, irqs, data) \ 161 struct amba_device name##_device = { \ 162 .dev = __AMBA_DEV(busid, data, 0), \ 163 .res = DEFINE_RES_MEM(base, SZ_4K), \ 164 .irq = irqs, \ 165 .periphid = id, \ 166 } 167 168 /* 169 * AHB devices are DMA capable, so set their DMA masks 170 */ 171 #define AMBA_AHB_DEVICE(name, busid, id, base, irqs, data) \ 172 struct amba_device name##_device = { \ 173 .dev = __AMBA_DEV(busid, data, ~0ULL), \ 174 .res = DEFINE_RES_MEM(base, SZ_4K), \ 175 .irq = irqs, \ 176 .periphid = id, \ 177 } 178 179 /* 180 * module_amba_driver() - Helper macro for drivers that don't do anything 181 * special in module init/exit. This eliminates a lot of boilerplate. Each 182 * module may only use this macro once, and calling it replaces module_init() 183 * and module_exit() 184 */ 185 #define module_amba_driver(__amba_drv) \ 186 module_driver(__amba_drv, amba_driver_register, amba_driver_unregister) 187 188 /* 189 * builtin_amba_driver() - Helper macro for drivers that don't do anything 190 * special in driver initcall. This eliminates a lot of boilerplate. Each 191 * driver may only use this macro once, and calling it replaces the instance 192 * device_initcall(). 193 */ 194 #define builtin_amba_driver(__amba_drv) \ 195 builtin_driver(__amba_drv, amba_driver_register) 196 197 #endif 198