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/* Interface for accessing Gaisler AMBA Plug&Play Bus.
* The AHB bus can be interfaced with a simpler bus -
* the APB bus, also freely available in GRLIB at
* www.gaisler.com.
*
* (C) Copyright 2009, 2015
* Daniel Hellstrom, Cobham Gaisler, daniel@gaisler.com.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __AMBAPP_H__
#define __AMBAPP_H__
#include <ambapp_ids.h>
#ifndef __ASSEMBLER__
/* Structures used to access Plug&Play information directly */
struct ambapp_pnp_ahb {
const unsigned int id; /* VENDOR, DEVICE, VER, IRQ, */
const unsigned int custom[3];
const unsigned int mbar[4]; /* MASK, ADDRESS, TYPE,
* CACHABLE/PREFETCHABLE */
};
struct ambapp_pnp_apb {
const unsigned int id; /* VENDOR, DEVICE, VER, IRQ, */
const unsigned int iobar; /* MASK, ADDRESS, TYPE,
* CACHABLE/PREFETCHABLE */
};
/* AMBA Plug&Play AHB Masters & Slaves information locations
* Max devices is 64 supported by HW, however often only 16
* are used.
*/
struct ambapp_pnp_info {
struct ambapp_pnp_ahb masters[64];
struct ambapp_pnp_ahb slaves[63];
const unsigned int unused[4];
const unsigned int systemid[4];
};
/* Describes a AMBA PnP bus */
struct ambapp_bus {
int buses; /* Number of buses */
unsigned int ioareas[6]; /* PnP I/O AREAs of AHB buses */
unsigned int freq; /* Frequency of bus0 [Hz] */
};
/* Processor Local AMBA bus */
extern struct ambapp_bus ambapp_plb;
/* Get Bus frequency of a certain AMBA bus */
extern unsigned int ambapp_bus_freq(
struct ambapp_bus *abus,
int ahb_bus_index
);
/* AMBA PnP information of a APB Device */
typedef struct {
unsigned int vendor;
unsigned int device;
unsigned char irq;
unsigned char ver;
unsigned int address;
unsigned int mask;
int ahb_bus_index;
} ambapp_apbdev;
/* AMBA PnP information of a AHB Device */
typedef struct {
unsigned int vendor;
unsigned int device;
unsigned char irq;
unsigned char ver;
unsigned int userdef[3];
unsigned int address[4];
unsigned int mask[4];
int type[4];
int ahb_bus_index;
} ambapp_ahbdev;
/* Scan AMBA Bus for AHB Bridges */
extern void ambapp_bus_init(
unsigned int ioarea,
unsigned int freq,
struct ambapp_bus *abus);
/* Find APB Slave device by index using breath first search.
*
* When vendor and device are both set to zero, any device
* with a non-zero device ID will match the search. It may be
* useful when processing all devices on a AMBA bus.
*/
extern int ambapp_apb_find(
struct ambapp_bus *abus,
int vendor,
int device,
int index,
ambapp_apbdev *dev
);
/* Find AHB Master device by index using breath first search.
*
* When vendor and device are both set to zero, any device
* with a non-zero device ID will match the search. It may be
* useful when processing all devices on a AMBA bus.
*/
extern int ambapp_ahbmst_find(
struct ambapp_bus *abus,
int vendor,
int device,
int index,
ambapp_ahbdev *dev
);
/* Find AHB Slave device by index using breath first search.
*
* When vendor and device are both set to zero, any device
* with a non-zero device ID will match the search. It may be
* useful when processing all devices on a AMBA bus.
*/
extern int ambapp_ahbslv_find(
struct ambapp_bus *abus,
int vendor,
int device,
int index,
ambapp_ahbdev *dev
);
/* Return number of APB Slave devices of a certain ID (VENDOR:DEVICE)
* zero is returned if no devices was found.
*/
extern int ambapp_apb_count(struct ambapp_bus *abus, int vendor, int device);
/* Return number of AHB Master devices of a certain ID (VENDOR:DEVICE)
* zero is returned if no devices was found.
*/
extern int ambapp_ahbmst_count(struct ambapp_bus *abus, int vendor, int device);
/* Return number of AHB Slave devices of a certain ID (VENDOR:DEVICE)
* zero is returned if no devices was found.
*/
extern int ambapp_ahbslv_count(struct ambapp_bus *abus, int vendor, int device);
#ifdef CONFIG_CMD_AMBAPP
/* AMBA Plug&Play relocation & initialization */
int ambapp_init_reloc(void);
/* AMBA Plug&Play Name of Vendors and devices */
/* Return name of device */
char *ambapp_device_id2str(int vendor, int id);
/* Return name of vendor */
char *ambapp_vendor_id2str(int vendor);
/* Return description of a device */
char *ambapp_device_id2desc(int vendor, int id);
#endif
#endif /* defined(__ASSEMBLER__) */
#define AMBA_DEFAULT_IOAREA 0xfff00000
#define AMBA_CONF_AREA 0xff000
#define AMBA_AHB_SLAVE_CONF_AREA 0x800
#define DEV_NONE 0
#define DEV_AHB_MST 1
#define DEV_AHB_SLV 2
#define DEV_APB_SLV 3
#define AMBA_TYPE_APBIO 0x1
#define AMBA_TYPE_MEM 0x2
#define AMBA_TYPE_AHBIO 0x3
/* ID layout for APB and AHB devices */
#define AMBA_PNP_ID(vendor, device) (((vendor)<<24) | ((device)<<12))
/* APB Slave PnP layout definitions */
#define AMBA_APB_ID_OFS (0*4)
#define AMBA_APB_IOBAR_OFS (1*4)
#define AMBA_APB_CONF_LENGH (2*4)
/* AHB Master/Slave layout PnP definitions */
#define AMBA_AHB_ID_OFS (0*4)
#define AMBA_AHB_CUSTOM0_OFS (1*4)
#define AMBA_AHB_CUSTOM1_OFS (2*4)
#define AMBA_AHB_CUSTOM2_OFS (3*4)
#define AMBA_AHB_MBAR0_OFS (4*4)
#define AMBA_AHB_MBAR1_OFS (5*4)
#define AMBA_AHB_MBAR2_OFS (6*4)
#define AMBA_AHB_MBAR3_OFS (7*4)
#define AMBA_AHB_CONF_LENGH (8*4)
/* Macros for extracting information from AMBA PnP information
* registers.
*/
#define amba_vendor(x) (((x) >> 24) & 0xff)
#define amba_device(x) (((x) >> 12) & 0xfff)
#define amba_irq(conf) ((conf) & 0x1f)
#define amba_ver(conf) (((conf)>>5) & 0x1f)
#define amba_iobar_start(base, iobar) \
((base) | ((((iobar) & 0xfff00000)>>12) & (((iobar) & 0xfff0)<<4)))
#define amba_membar_start(mbar) \
(((mbar) & 0xfff00000) & (((mbar) & 0xfff0) << 16))
#define amba_membar_type(mbar) ((mbar) & 0xf)
#define amba_membar_mask(mbar) (((mbar) >> 4) & 0xfff)
#define amba_ahbio_adr(addr, base_ioarea) \
((unsigned int)(base_ioarea) | ((addr) >> 12))
#define amba_apb_mask(iobar) ((~(amba_membar_mask(iobar)<<8) & 0x000fffff) + 1)
#endif
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