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