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317 lines
8.6 KiB
C
317 lines
8.6 KiB
C
/* GRLIB AMBA Plug&Play information scanning, relies on assembler
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* routines.
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*
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* (C) Copyright 2010, 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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/* #define DEBUG */
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#include <common.h>
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#include <malloc.h>
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#include <ambapp.h>
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#include <config.h>
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/************ C INTERFACE OF ASSEMBLER SCAN ROUTINES ************/
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struct ambapp_find_apb_info {
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/* Address of APB device Plug&Play information */
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struct ambapp_pnp_apb *pnp;
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/* AHB Bus index of where the APB-Master Bridge device was found */
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int ahb_bus_index;
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int dec_index;
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};
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struct ambapp_find_ahb_info {
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/* Address of AHB device Plug&Play information */
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struct ambapp_pnp_ahb *pnp;
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/* AHB Bus index of where the AHB device was found */
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int ahb_bus_index;
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int dec_index;
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};
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extern void ambapp_find_buses(unsigned int ioarea, struct ambapp_bus *abus);
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extern int ambapp_find_apb(struct ambapp_bus *abus, unsigned int dev_vend,
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int index, struct ambapp_find_apb_info *result);
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extern int ambapp_find_ahb(struct ambapp_bus *abus, unsigned int dev_vend,
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int index, int type, struct ambapp_find_ahb_info *result);
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/************ C ROUTINES USED BY U-BOOT AMBA CORE DRIVERS ************/
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struct ambapp_bus ambapp_plb __section(.data);
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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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{
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int i;
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ambapp_find_buses(ioarea, abus);
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for (i = 0; i < 6; i++)
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if (abus->ioareas[i] == 0)
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break;
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abus->buses = i;
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abus->freq = freq;
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}
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/* Parse APB PnP Information */
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void ambapp_apb_parse(struct ambapp_find_apb_info *info, ambapp_apbdev *dev)
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{
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struct ambapp_pnp_apb *apb = info->pnp;
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unsigned int apbbase = (unsigned int)apb & 0xfff00000;
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dev->vendor = amba_vendor(apb->id);
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dev->device = amba_device(apb->id);
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dev->irq = amba_irq(apb->id);
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dev->ver = amba_ver(apb->id);
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dev->address = (apbbase | (((apb->iobar & 0xfff00000) >> 12))) &
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(((apb->iobar & 0x0000fff0) << 4) | 0xfff00000);
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dev->mask = amba_apb_mask(apb->iobar);
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dev->ahb_bus_index = info->ahb_bus_index - 1;
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}
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/* Parse AHB PnP information */
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void ambapp_ahb_parse(struct ambapp_find_ahb_info *info, ambapp_ahbdev *dev)
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{
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struct ambapp_pnp_ahb *ahb = info->pnp;
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unsigned int ahbbase = (unsigned int)ahb & 0xfff00000;
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int i, type;
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unsigned int addr, mask, mbar;
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dev->vendor = amba_vendor(ahb->id);
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dev->device = amba_device(ahb->id);
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dev->irq = amba_irq(ahb->id);
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dev->ver = amba_ver(ahb->id);
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dev->userdef[0] = ahb->custom[0];
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dev->userdef[1] = ahb->custom[1];
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dev->userdef[2] = ahb->custom[2];
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dev->ahb_bus_index = info->ahb_bus_index - 1;
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for (i = 0; i < 4; i++) {
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mbar = ahb->mbar[i];
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addr = amba_membar_start(mbar);
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type = amba_membar_type(mbar);
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if (type == AMBA_TYPE_AHBIO) {
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addr = amba_ahbio_adr(addr, ahbbase);
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mask = (((unsigned int)
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(amba_membar_mask((~mbar))<<8)|0xff))+1;
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} else {
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/* AHB memory area, absolute address */
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mask = (~((unsigned int)
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(amba_membar_mask(mbar)<<20)))+1;
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}
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dev->address[i] = addr;
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dev->mask[i] = mask;
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dev->type[i] = type;
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}
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}
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int ambapp_apb_find(struct ambapp_bus *abus, int vendor, int device,
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int index, ambapp_apbdev *dev)
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{
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unsigned int devid = AMBA_PNP_ID(vendor, device);
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int found;
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struct ambapp_find_apb_info apbdev;
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found = ambapp_find_apb(abus, devid, index, &apbdev);
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if (found == 1)
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ambapp_apb_parse(&apbdev, dev);
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return found;
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}
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int ambapp_apb_count(struct ambapp_bus *abus, int vendor, int device)
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{
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unsigned int devid = AMBA_PNP_ID(vendor, device);
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int found;
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struct ambapp_find_apb_info apbdev;
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found = ambapp_find_apb(abus, devid, 63, &apbdev);
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if (found == 1)
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return 64;
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else
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return 63 - apbdev.dec_index;
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}
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int ambapp_ahb_find(struct ambapp_bus *abus, int vendor, int device,
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int index, ambapp_ahbdev *dev, int type)
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{
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int found;
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struct ambapp_find_ahb_info ahbdev;
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unsigned int devid = AMBA_PNP_ID(vendor, device);
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found = ambapp_find_ahb(abus, devid, index, type, &ahbdev);
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if (found == 1)
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ambapp_ahb_parse(&ahbdev, dev);
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return found;
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}
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int ambapp_ahbmst_find(struct ambapp_bus *abus, int vendor, int device,
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int index, ambapp_ahbdev *dev)
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{
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return ambapp_ahb_find(abus, vendor, device, index, dev, DEV_AHB_MST);
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}
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int ambapp_ahbslv_find(struct ambapp_bus *abus, int vendor, int device,
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int index, ambapp_ahbdev *dev)
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{
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return ambapp_ahb_find(abus, vendor, device, index, dev, DEV_AHB_SLV);
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}
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int ambapp_ahb_count(struct ambapp_bus *abus, int vendor, int device, int type)
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{
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int found;
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struct ambapp_find_ahb_info ahbdev;
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unsigned int devid = AMBA_PNP_ID(vendor, device);
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found = ambapp_find_ahb(abus, devid, 63, type, &ahbdev);
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if (found == 1)
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return 64;
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else
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return 63 - ahbdev.dec_index;
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}
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int ambapp_ahbmst_count(struct ambapp_bus *abus, int vendor, int device)
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{
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return ambapp_ahb_count(abus, vendor, device, DEV_AHB_MST);
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}
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int ambapp_ahbslv_count(struct ambapp_bus *abus, int vendor, int device)
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{
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return ambapp_ahb_count(abus, vendor, device, DEV_AHB_SLV);
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}
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/* The define CONFIG_SYS_GRLIB_SINGLE_BUS may be defined on GRLIB systems
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* where only one AHB Bus is available - no bridges are present. This option
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* is available only to reduce the footprint.
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*
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* Defining this on a multi-bus GRLIB system may also work depending on the
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* design.
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*/
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#ifndef CONFIG_SYS_GRLIB_SINGLE_BUS
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/* GAISLER AHB2AHB Version 1 Bridge Definitions */
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#define AHB2AHB_V1_FLAG_FFACT 0x0f0 /* Frequency factor against top bus */
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#define AHB2AHB_V1_FLAG_FFACT_DIR 0x100 /* Factor direction, 0=down, 1=up */
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#define AHB2AHB_V1_FLAG_MBUS 0x00c /* Master bus number mask */
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#define AHB2AHB_V1_FLAG_SBUS 0x003 /* Slave bus number mask */
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/* Get Parent bus frequency. Note that since we go from a "child" bus
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* to a parent bus, the frequency factor direction is inverted.
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*/
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unsigned int gaisler_ahb2ahb_v1_freq(ambapp_ahbdev *ahb, unsigned int freq)
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{
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int dir;
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unsigned char ffact;
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/* Get division/multiple factor */
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ffact = (ahb->userdef[0] & AHB2AHB_V1_FLAG_FFACT) >> 4;
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if (ffact != 0) {
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dir = ahb->userdef[0] & AHB2AHB_V1_FLAG_FFACT_DIR;
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/* Calculate frequency by dividing or
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* multiplying system frequency
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*/
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if (dir)
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freq = freq * ffact;
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else
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freq = freq / ffact;
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}
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return freq;
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}
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/* AHB2AHB and L2CACHE ver 2 is not supported yet. */
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unsigned int gaisler_ahb2ahb_v2_freq(ambapp_ahbdev *ahb, unsigned int freq)
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{
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panic("gaisler_ahb2ahb_v2_freq: AHB2AHB ver 2 not supported\n");
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return -1;
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}
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#endif
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/* Return the frequency of a AHB bus identified by index found
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* note that this is not the AHB Bus number.
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*/
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unsigned int ambapp_bus_freq(struct ambapp_bus *abus, int ahb_bus_index)
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{
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unsigned int freq = abus->freq;
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#ifndef CONFIG_SYS_GRLIB_SINGLE_BUS
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unsigned int ioarea, ioarea_parent, bridge_pnp_ofs;
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struct ambapp_find_ahb_info ahbinfo;
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ambapp_ahbdev ahb;
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int parent;
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debug("ambapp_bus_freq: get freq on bus %d\n", ahb_bus_index);
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while (ahb_bus_index != 0) {
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debug(" BUS[0]: 0x%08x\n", abus->ioareas[0]);
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debug(" BUS[1]: 0x%08x\n", abus->ioareas[1]);
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debug(" BUS[2]: 0x%08x\n", abus->ioareas[2]);
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debug(" BUS[3]: 0x%08x\n", abus->ioareas[3]);
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debug(" BUS[4]: 0x%08x\n", abus->ioareas[4]);
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debug(" BUS[5]: 0x%08x\n", abus->ioareas[5]);
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/* Get I/O area of AHB bus */
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ioarea = abus->ioareas[ahb_bus_index];
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debug(" IOAREA: 0x%08x\n", ioarea);
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/* Get parent bus */
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parent = (ioarea & 0x7);
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if (parent == 0) {
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panic("%s: parent=0 indicates no parent! Stopping.\n",
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__func__);
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return -1;
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}
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parent = parent - 1;
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bridge_pnp_ofs = ioarea & 0x7e0;
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debug(" PARENT: %d\n", parent);
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debug(" BRIDGE_OFS: 0x%08x\n", bridge_pnp_ofs);
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/* Get AHB/AHB bridge PnP address */
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ioarea_parent = (abus->ioareas[parent] & 0xfff00000) |
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AMBA_CONF_AREA | AMBA_AHB_SLAVE_CONF_AREA;
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ahbinfo.pnp = (struct ambapp_pnp_ahb *)
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(ioarea_parent | bridge_pnp_ofs);
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debug(" IOAREA PARENT: 0x%08x\n", ioarea_parent);
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debug(" BRIDGE PNP: 0x%p\n", ahbinfo.pnp);
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/* Parse the AHB information */
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ahbinfo.ahb_bus_index = parent;
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ambapp_ahb_parse(&ahbinfo, &ahb);
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debug(" BRIDGE ID: VENDOR=%d(0x%x), DEVICE=%d(0x%x)\n",
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ahb.vendor, ahb.vendor, ahb.device, ahb.device);
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/* Different bridges may convert frequency differently */
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if ((ahb.vendor == VENDOR_GAISLER) &&
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((ahb.device == GAISLER_AHB2AHB) ||
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(ahb.device == GAISLER_L2CACHE))) {
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/* Get new frequency */
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if (ahb.ver > 1)
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freq = gaisler_ahb2ahb_v2_freq(&ahb, freq);
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else
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freq = gaisler_ahb2ahb_v1_freq(&ahb, freq);
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debug(" NEW FREQ: %dHz\n", freq);
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} else {
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panic("%s: unsupported AMBA bridge\n", __func__);
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return -1;
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}
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/* Step upwards towards system top bus */
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ahb_bus_index = parent;
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}
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#endif
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debug("ambapp_bus_freq: %dHz\n", freq);
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return freq;
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}
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