diff options
Diffstat (limited to 'arch/sparc/cpu/leon3/ambapp_low.S')
| -rw-r--r-- | arch/sparc/cpu/leon3/ambapp_low.S | 784 |
1 files changed, 0 insertions, 784 deletions
diff --git a/arch/sparc/cpu/leon3/ambapp_low.S b/arch/sparc/cpu/leon3/ambapp_low.S deleted file mode 100644 index 2863586dc1..0000000000 --- a/arch/sparc/cpu/leon3/ambapp_low.S +++ /dev/null @@ -1,784 +0,0 @@ -/* GRLIB AMBA Plug&Play information scanning implemented without - * using memory (stack) and one register window. The code scan - * the PnP info and inserts the AHB bridges/buses into register - * i0-i5. - * The code support - * - up to 6 AHB buses - * - multiple APB buses - * - support for AHB2AHB & L2CACHE bridges - * - * (C) Copyright 2010, 2015 - * Daniel Hellstrom, Cobham Gaisler, daniel@gaisler.com. - * - * SPDX-License-Identifier: GPL-2.0+ - */ - -#include <ambapp.h> - - .seg "text" - .globl _nomem_amba_init - .globl _nomem_ambapp_find_buses - .globl _nomem_find_apb - .globl _nomem_find_ahb - -/* Overview - * ======== - * - * _nomem_amba_init - Init AMBA bus and calls _nomem_ambapp_find_buses - * _nomem_ambapp_find_buses - Scan AMBA PnP info for AHB buses/bridges and - * place them in i0-i5, see below - * _nomem_find_apb - Find one APB device identified by VENDOR:DEVICE - * ID and an index. - * _nomem_find_ahb - Find one AHB Master or Slave device identified - * by VENDOR:DEVICE ID and an index. - * init_ahb_bridges - Local function. Clears i0-i5 - * insert_ahb_bridge - Local function. Insert a new AHB bus into first - * free register in i0-i5. It also checks that the - * bus has not already been added. - * get_ahb_bridge - Local function. Get AHB bus from registers, - * return register iN, where N is defined by o0. - * - * The _nomem_find_apb and _nomem_find_ahb function requires that i0-i5 - * are populated with the AHB buses of the system. The registers are - * initialized by _nomem_ambapp_find_buses. - * - * AHB Bus result and requirements of i0-i5 - * ======================================== - * - * i0: AHB BUS0 IOAREA, no parent bus - * i1: AHB BUS1 IOAREA, parent bus is always i0 (AHB BUS0) and bridge address - * i2: AHB BUS2 IOAREA, 3-bit parent bus number and bridge address - * i3: AHB BUS3 IOAREA, 3-bit parent bus number and bridge address - * i4: AHB BUS4 IOAREA, 3-bit parent bus number and bridge address - * i5: AHB BUS5 IOAREA, 3-bit parent bus number and bridge address - * - * AHB BUS - * ------- - * Bits 31-20 (0xfff00000) contain the found bus I/O Area (AHB PnP area). - * - * 3-bit Parent bus - * ---------------- - * Bits 2-0 (0x00000007) contain parent bus number. Zero if no parent - * bus, 1 = parent is AHB BUS 0 (i0), 2 = parent is AHB BUS 1 (i1).. - * - * Bridge Address - * -------------- - * Bits 10-5 (0x000007e0) contain the index of the Bridge's PnP - * information on the parent. Since all bridges are found in the - * PnP information they all have a PnP entry. Together with the - * parent bus number the PnP entry can be found: - * PnPEntry = (BRIDGE_ADDRESS + (iN & 0xfff00000)) | 0x000ff800 - * where N is the parent bus minus one. - * - */ - -/* Function initializes the AHB Bridge I/O AREA storage. (Clears i0-i5) - * - * Arguments - * none - * - * Results - * none - * - * Clobbered - * none - */ - -init_ahb_bridges: - mov %g0, %i0 - mov %g0, %i1 - mov %g0, %i2 - mov %g0, %i3 - mov %g0, %i4 - retl - mov %g0, %i5 - -/* Function returns AHB Bridge I/O AREA for specified bus. - * - * Arguments - * - o0 = bus number - * - * Results - * - o0 = I/O AREA - * - * Clobbered - * none - */ -get_ahb_bridge: - cmp %o0, 1 - be,a L1 - mov %i0, %o0 - - cmp %o0, 2 - be,a L1 - mov %i1, %o0 - - cmp %o0, 3 - be,a L1 - mov %i2, %o0 - - cmp %o0, 4 - be,a L1 - mov %i3, %o0 - - cmp %o0, 5 - be,a L1 - mov %i4, %o0 - - cmp %o0, 6 - be,a L1 - mov %i5, %o0 - - /* o0 > 6: only 6 buses supported */ - mov %g0, %o0 -L1: - retl - nop - -/* Function adds a AHB Bridge I/O AREA to the i0-i5 registers if - * not already added. It stores the bus PnP start information. - * - * Arguments - * - o0 = AHB Bridge I/O area - * - * Results - * none - * - * Clobbered - * o2, o3 - */ -insert_ahb_bridge: - /* Check that bridge hasn't already been added */ - andn %o0, 0x7ff, %o2 - andn %i0, 0x7ff, %o3 - cmp %o3, %o2 - be L2 - andn %i1, 0x7ff, %o3 - cmp %o3, %o2 - be L2 - andn %i2, 0x7ff, %o3 - cmp %o3, %o2 - be L2 - andn %i3, 0x7ff, %o3 - cmp %o3, %o2 - be L2 - andn %i4, 0x7ff, %o3 - cmp %o3, %o2 - be L2 - andn %i5, 0x7ff, %o3 - cmp %o3, %o2 - be L2 - - /* Insert into first free posistion */ - cmp %i0, %g0 - be,a L2 - mov %o0, %i0 - - cmp %i1, %g0 - be,a L2 - mov %o0, %i1 - - cmp %i2, %g0 - be,a L2 - mov %o0, %i2 - - cmp %i3, %g0 - be,a L2 - mov %o0, %i3 - - cmp %i4, %g0 - be,a L2 - mov %o0, %i4 - - cmp %i5, %g0 - be,a L2 - mov %o0, %i5 -L2: - retl - nop - -/* FUNCTION int _nomem_find_ahb_bus( - * unsigned int bridge, - * int vendor_device, - * int index, - * void **pconf, - * int not_used, - * int option - * ) - * - * Scans the AHB Master or Slave area for a matching VENDOR:DEVICE, the - * index is decremented when a matching device is found but index is - * greater than zero. When index is zero and a matching DEVICE:VENDOR - * is found the AHB configuration address and AHB I/O area is returned. - * - * i0-i7,l0,l1,l2,l3,l4,g2,o6 is not available for use. - * o1,o5 Must be left untouched - * - * Results - * - o0 Number of found devices (1 or 0) - * - o2 is decremented for each matching VENDOR:DEVICE found, zero if found - * - o3 Address of the AHB PnP configuration entry (Only valid if o0=1) - * - * Clobbered - * - o3 (Clobbered when no device was found) - * - o4 (Number of Devices left to search) - * - o0 (Bus ID, PnP ID, Device) - */ -_nomem_find_ahb_bus: - - /* Get the number of Slaves/Masters. - * Only AHB Bus 0 has 64 AHB Masters/Slaves the - * other AHB buses has 16 slaves and 16 masters. - */ - add %g0, 16, %o4 /* Defaulting to 16 */ - andcc %o0, 0x7, %g0 /* 3-bit bus id */ - be,a .L_maxloops_detected - add %g0, 64, %o4 /* AHB Bus 0 has 64 AHB Masters/Slaves */ -.L_maxloops_detected: - - /* Get start address of AHB Slave or AHB Master area depending on what - * we are searching for. - */ - andn %o0, 0x7ff, %o0 /* Remove Bus ID and 5-bit AHB/AHB - * Bridge PnP Address to get I/O Area */ - set AMBA_CONF_AREA, %o3 - or %o3, %o0, %o3 /* Master area address */ - - cmp %o5, DEV_AHB_SLV - be,a .L_conf_area_calculated - or %o3, AMBA_AHB_SLAVE_CONF_AREA, %o3 /* Add 0x800 to get to slave area */ -.L_conf_area_calculated: - - /* Iterate over all AHB device and try to find matching DEVICE:VENDOR - * o1 - VENDOR|DEVICE - * o2 - Index - * o3 - Current AHB Device Configuration address - * o5 - Type (leave untouched) - * - * o4 - Number of AHB device left to process - * o0 - tmp - */ -.L_process_one_conf: - ld [%o3], %o0 - andn %o0, 0xfff, %o0 - cmp %o0, 0 /* No device if zero */ - beq .L_next_conf - cmp %o1, 0 /* If VENDOR:DEVICE==0, consider all matching */ - beq .L_process_ahb_dev_found - cmp %o0, %o1 /* Does VENDOR and DEVICE Match? */ - bne .L_next_conf - nop -.L_process_ahb_dev_found: - /* Found a Matching VENDOR:DEVICE, index must also match */ - cmp %o2, %g0 - bne .L_next_conf - dec %o2 - /* Index matches also, return happy with o3 set to AHB Conf Address */ - mov %g0, %o2 - retl - add %g0, 1, %o0 - -.L_next_conf: - subcc %o4, 1, %o4 /* One device has been processed, - * Are there more devices to process? */ - bne .L_process_one_conf - add %o3, AMBA_AHB_CONF_LENGH, %o3 /* Next Configuration entry */ - /* No Matching device found */ - retl - mov %g0, %o0 - -/* FUNCTION int _nomem_find_ahb( - * int unused, - * int vendor_device, - * int index, - * void **pconf, - * int *ahb_bus_index, - * int option, - * ) - * - * Find a AHB Master or AHB Slave device, it puts the address of the AHB PnP - * configuration in o3 (pconf), the I/O Area base address in o4 (pioarea). - * - * Calls _nomem_find_ahb_bus for every AHB bus. - * - * i0-i7, l0, l1, o6, g1, g4-g7 is not available for use. - * - * Arguments - * - o0 Unused - * - * Results - * - o0 Number of found devices (1 or 0) - * - o2 Decremented Index (Zero if found) - * - o3 Address of the AHB PnP configuration entry - * - o4 AHB Bus index the device was found on (if o0=1) - * - o5 Left untouched - * - * Clobbered - * - o0 (AHB Bridge and used by _nomem_find_ahb_bus) - * - o2 (index is decremented) - * - l2 (Current AHB Bus index) - * - g2 (return address) - */ -_nomem_find_ahb: - mov %o7, %g2 /* Save return address */ - /* Scan all AHB Buses found for the AHB Master/Slave matching VENDOR:DEVICE */ - clr %l2 -.L_search_next_ahb_bus: - add %l2, 1, %l2 - call get_ahb_bridge /* Get bus %l0 I/O Area */ - mov %l2, %o0 - cmp %o0, %g0 - be .L_no_device_found /* If no more AHB bus is left to be scanned, proceed */ - nop - call _nomem_find_ahb_bus /* Scan AHB bus %o0 for VENDOR:DEVICE. Index in o3 is decremented */ - nop - cmp %o0, %g0 /* If VENDOR:DEVICE was not found scan next AHB Bus */ - be .L_search_next_ahb_bus /* Do next bus is o0=0 (not found) */ - nop - /* The device was found, o0 is 1 */ - mov %g2, %o7 /* Restore return address */ - retl - mov %l2, %o4 /* The AHB bus index the device was found on */ - - /* No device found matching */ -.L_no_device_found: - mov %g2, %o7 /* Restore return address */ - retl - mov %g0, %o0 - - -/* FUNCTION int _nomem_find_apb_bus( - * int apbmst, - * int vendor_device, - * int index, - * void **pconf - * ) - * - * Find a APB Slave device, it puts the address of the APB PnP configuration - * in o3 (pconf). - * - * Calls _nomem_find_ahb_bus for every AHB bus searching for AHB/APB Bridges. - * The AHB/APB bridges are AHB Slaves with ID GAISLER_APBMST. - * - * Results - * - o0 Number of found devices (1 or 0) - * - o2 Decremented Index - * - o3 Address of the found APB device PnP configuration entry - * - * Clobbered - * - o5 PnP VENDOR:DEVICE ID - */ - -_nomem_find_apb_bus: - set AMBA_CONF_AREA, %o3 - or %o0, %o3, %o3 /* Calc start of APB device PnP info */ - add %g0, 16, %o0 /* o0, number of APB Slaves left to scan */ -.L_process_one_apb_conf: - ld [%o3], %o5 - andn %o5, 0xfff, %o5 - cmp %o5, 0 /* No device if zero */ - beq .L_process_apb_dev_not_found - cmp %o1, 0 /* If VENDOR:DEVICE == -1, consider all matching */ - beq .L_process_apb_dev_found - cmp %o1, %o5 /* Found VENDOR:DEVICE */ - bne .L_process_apb_dev_not_found - nop - -.L_process_apb_dev_found: - /* Found matching device, compare index */ - cmp %o2, %g0 - bne .L_process_apb_dev_not_found - dec %o2 - /* Matching index and VENDOR:DEVICE */ - retl - add %g0, 1, %o0 - -.L_process_apb_dev_not_found: - subcc %o0, 1, %o0 - bne .L_process_one_apb_conf - add %o3, 8, %o3 - retl - mov %g0, %o0 - -/* FUNCTION int _nomem_find_apb( - * int unused, - * int vendor_device, - * int index, - * void **pconf, - * int *ahb_bus_index - * ) - * - * Find a APB Slave device, it puts the address of the APB PnP configuration - * in o3 (pconf), the APB Master I/O Area base address in o4 (papbarea). - * - * Calls _nomem_find_ahb_bus for every AHB bus searching for AHB/APB Bridges. - * The AHB/APB bridges are AHB Slaves with ID GAISLER_APBMST. - * - * i0-i7, l0, l1, o6 is not available for use. - * - * Arguments - * - o0 Unused - * - * Results - * - o0 Number of found devices (1 or 0) - * - o2 Decremented Index if not found - * - o3 Address of the APB PnP configuration entry - * - o4 AHB Bus index of APB Bridge/APB Device - * - * Clobbered - * - o0 (AHB Bridge) - * - o2 (index is decremented) - * - l2 (APB DEV Index [7..4] : APBMST AHB Index [3..0]) - * - l3 (Current AHB Bus index) - * - l4 (temporary storage for APB VENDOR:DEVICE) - * - o5 (AHB Slave ID) - * - o0 (clobbered by _nomem_find_ahb_bus) - * - g2 (Return address) - */ -_nomem_find_apb: - /* Scan all AHB Buses found for AHB/APB Bridges */ - mov %o7, %g2 /* Save return address */ - mov %o1, %l4 /* Save APB VENDOR:DEVICE */ - sll %o2, 4, %l2 /* APB MST index = 0 */ - add %g0, 1, %l3 /* AHB Bus index = 0 */ -.L2_search_next_ahb_bus: - call get_ahb_bridge /* Get bus %l3 I/O Area */ - mov %l3, %o0 - cmp %o0, %g0 - be .L2_no_device_found /* If no more AHB bus is left to be scanned, proceed */ - add %g0, DEV_AHB_SLV, %o5 /* Search for AHB Slave */ - sethi %hi(AMBA_PNP_ID(VENDOR_GAISLER, GAISLER_APBMST)), %o1 - call _nomem_find_ahb_bus /* Scan AHB bus %o0 for VENDOR:DEVICE. Index in o3 is decremented */ - and %l2, 0xf, %o2 /* Set APBMST index */ - cmp %o0, %g0 /* If no AHB/APB Bridge was not found, scan next AHB Bus */ - be .L_no_apb_bridge_found /* Do next bus */ - nop - - /* The AHB/APB Bridge was found. - * Search for the requested APB Device on the APB bus using - * find_apb_bus, it will decrement the index. - */ - ld [%o3 + AMBA_AHB_MBAR0_OFS], %o3 - sll %o3, 16, %o0 - and %o0, %o3, %o0 /* Address AND Address Mask */ - sethi %hi(0xfff00000), %o3 - and %o0, %o3, %o0 /* AHB/APB Bridge address */ - - srl %l2, 4, %o2 /* APB DEV Index */ - call _nomem_find_apb_bus - mov %l4, %o1 /* APB VENDOR:DEVICE */ - cmp %o0, %g0 - be .L_apb_dev_not_found - mov %g2, %o7 /* Restore return address */ - /* APB Device found - * o0 1 - * o2 Index is decremented to zero - * o3 APB configuration address, - * o4 APB Bridge Configuration address. - */ - mov %g0, %o2 - retl - mov %l3, %o4 - -.L_apb_dev_not_found: - /* Update APB DEV Index by saving output from find_apb_bus - * (index parameter) into bits [31..4] in L2. - */ - sll %o2, 4, %o2 - and %l2, 0xf, %l2 - or %o2, %l2, %l2 - /* Try finding the next AHB/APB Bridge on the same AHB bus - * to find more APB devices - */ - ba .L2_search_next_ahb_bus /* Find next AHB/APB bridge */ - inc %l2 - -.L_no_apb_bridge_found: - inc %l3 /* Next AHB Bus */ - ba .L2_search_next_ahb_bus /* Process next AHB bus */ - andn %l2, 0xf, %l2 /* Start at APB Bridge index 0 at every AHB Bus */ - /* No device found matching */ -.L2_no_device_found: - mov %g2, %o7 /* Restore return address */ - srl %l2, 4, %o2 /* APB DEV Index */ - retl - mov %g0, %o0 - - - -/* FUNCTION _nomem_amba_scan_gaisler_ahb2ahb_bridge(unsigned int bridge, int bus) - * - * Constraints: - * - o1 may not be used - * - o0, o2, o3 may be used. - * - * Arguments - * - o0 PnP Address of Bridge AHB device - * - o2 PnP ID of AHB device - * - * Results - * - o0 Address of new bus PnP area or a 1 if AHB device is no bridge - * - * Clobbered - * - o0, o2 - * - */ -_nomem_amba_scan_gaisler_ahb2ahb_bridge: - andn %o2, 0xfff, %o2 - sethi %hi(AMBA_PNP_ID(VENDOR_GAISLER,GAISLER_AHB2AHB)), %o3 - cmp %o2, %o3 - beq .L_is_ahb2ahb_bridge - nop - - retl - add %g0, 1, %o0 - -.L_is_ahb2ahb_bridge: - /* Found a GAISLER AHB2AHB bridge */ - retl - ld [%o0 + AMBA_AHB_CUSTOM1_OFS], %o0 /* Get address of bridge PnP area */ - - -/* FUNCTION _nomem_amba_scan_gaisler_l2cache_bridge(unsigned int bridge, int bus) - * - * Constraints: - * - o1 may not be used - * - o0, o2, o3 may be used. - * - * Arguments - * - o0 PnP Address of Bridge AHB device - * - o2 PnP ID of AHB device - * - * Results - * - o0 Address of new bus PnP area or a 1 if AHB device is no bridge - * - * Clobbered - * - o0, o2 - * - */ -_nomem_amba_scan_gaisler_l2cache_bridge: - andn %o2, 0xfff, %o2 - sethi %hi(AMBA_PNP_ID(VENDOR_GAISLER,GAISLER_L2CACHE)), %o3 - cmp %o2, %o3 - beq .L_is_l2cache_bridge - nop - - retl - add %g0, 1, %o0 - -.L_is_l2cache_bridge: - /* Found a GAISLER l2cache bridge */ - retl - ld [%o0 + AMBA_AHB_CUSTOM1_OFS], %o0 /* Get address of bridge PnP area */ - - -/* FUNCTION _nomem_amba_scan(unsigned int bridge, int bus) - * - * Constraints: - * i0-i7, l0 is used by caller - * o5-o7 may not be used. - * - * Arguments - * - o0 Bridge Information: I/O AREA and parent bus - * - o1 Bus - * - * Results - * - o0 Number of AHB bridges found - * - * Clobbered - * - o0 (Current AHB slave conf address) - * - o2 (Used by insert_bridge) - * - o3 (Used by insert_bridge) - * - l1 (Number of AHB Slaves left to process) - * - l2 (Current AHB slave conf address) - * - g2 (Return address) - */ -_nomem_amba_scan: - mov %o7, %g2 /* Save return address */ - set 16, %l1 - cmp %o1, 1 - be,a .L2_maxloops_detected - add %g0, 64, %l1 -.L2_maxloops_detected: - - /* Clear 3-bit parent bus from bridge to get I/O AREA, then or - * (AMBA_CONF_AREA | AMBA_AHB_SLAVE_CONF_AREA) to get first AHB slave - * conf address. - */ - andn %o0, 0x7ff, %o0 - set (AMBA_CONF_AREA | AMBA_AHB_SLAVE_CONF_AREA), %l2 - or %o0, %l2, %l2 - - /* Scan AHB Slave area for AHB<->AHB bridges. For each AHB device - * all "bridge drivers" are called, the driver function interface: - * - * Input: - * - o0 PnP Address of Bridge AHB device - * - o2 PnP ID of AHB device - * Return values: - * - o0 Address of new bus PnP area, returning a 1 in o2 means not found - * - * Constraints: - * - o1 may not be used - * - o0, o2, o3 may be used. - * - */ -.L_scan_one_ahb_slave: - ld [%l2], %o2 - - cmp %o2, %g0 - beq .L_scan_next_ahb_slave - nop - - /* Call the GAISLER AHB2AHB bridge driver */ - call _nomem_amba_scan_gaisler_ahb2ahb_bridge - mov %l2, %o0 - cmp %o0, 1 - bne .L_found_bridge - ld [%l2], %o2 - - /* Call the GAISLER L2CACHE bridge driver */ - call _nomem_amba_scan_gaisler_l2cache_bridge - mov %l2, %o0 - cmp %o0, 1 - bne .L_found_bridge - ld [%l2], %o2 - - /* Insert next bridge "driver" function here */ - - - /* The PnP ID did not match a bridge - a new bus was not found ==> - * step to next AHB device */ - ba .L_scan_next_ahb_slave - nop - - /* Add Found bus */ -.L_found_bridge: - and %l2, 0x7e0, %o2 - or %o2, %o0, %o0 /* Add AHB/AHB Bridge PnP address */ - call insert_ahb_bridge /* Insert Bridge into found buses storage */ - or %o1, %o0, %o0 /* Add parent bus LSB 3-bits */ - -.L_scan_next_ahb_slave: - /* More Slaves to process? */ - subcc %l1, 1, %l1 - bne .L_scan_one_ahb_slave - add %l2, AMBA_AHB_CONF_LENGH, %l2 - - /* No more AHB devices to process */ - mov %g2, %o7 /* Restore return address */ - retl - nop - -/* FUNCTION _nomem_ambapp_find_buses(unsigned int ioarea) - * - * Find AMBA AHB buses. - * - * Constraints: - * i6-i7, l7 is used by caller - * - * Arguments - * - o0 Bridge Information: I/O AREA and parent bus - * - * Results - * - o0 Number of AHB bridges found - * - i0-i5 initialized - * - * Clobbered - * - o0 (Current AHB slave conf address) - * - o2 (Used by insert_bridge) - * - o3 (Used by insert_bridge) - * - l0 (Current AHB Bus) - * - l1 (Used by nomem_amba_scan) - * - l2 (Used by nomem_amba_scan) - * - l3 (Used by nomem_amba_scan) - * - l4 (Used by nomem_amba_scan) - * - * - g1 (level 1 return address) - * - g2 (Used by nomem_amba_scan) - */ -_nomem_ambapp_find_buses: - mov %o7, %g1 /* Save return address */ - - /* Initialize AHB Bus storage */ - call init_ahb_bridges - nop - - /* Insert AHB Bus 0 */ - call insert_ahb_bridge - nop /* Argument already prepared by caller */ - - /* Scan AHB Bus 0 for AHB Bridges */ - call _nomem_amba_scan - add %g0, 1, %o1 - - /* Scan all AHB Buses found for more AHB Bridges */ - add %g0, 2, %l0 -.L100_search_next_ahb_bus: - call get_ahb_bridge /* Get bus %l0 I/O Area */ - mov %l0, %o0 - cmp %o0, %g0 - be .L100_return /* If no more AHB bus is left to be scanned, proceed */ - nop - call _nomem_amba_scan /* Scan bus %l0 for AHB Bridges. i0-i7,l0 is used */ - mov %l0, %o1 /* I/O AREA untouched in o0 */ - ba .L100_search_next_ahb_bus /* Do next bus */ - add %l0, 1, %l0 - -.L100_return: - mov %g1, %o7 - retl - nop - - -/* FUNCTION _nomem_amba_init(unsigned int ioarea) - * - * Find all AHB buses - * - * Constraints: - * i6, i7, o6, o7, l7, l6, g3, g4, g5, g6, g7 is used by caller - * - * Arguments - * - o0 Bridge Information: I/O AREA and parent bus - * - * Results - * - o0 Number of AHB bridges found - * - * Clobbered - * - l0, l1, l2, l3, l4, g1, g2 (used by _nomem_ambapp_find_buses) - * - o0, o1, o2, o3 (Used as arguments) - * - o5 (return address) - * - g1 (level 1 return address) - * - g2 (level 2 return address) - */ -_nomem_amba_init: - mov %o7, %o5 /* Save return address, o5 not used */ - - /* Scan for buses, it will init i0-i5 */ - call _nomem_ambapp_find_buses - nop - - mov %o5, %o7 - retl - nop - -/* Call tree and their return address register - * - *_nomem_amba_scan (g1) - * -> init_ahb_bridges (o7) - * -> insert_ahb_bridge (o7) - * -> _nomem_amba_scan (g2) - * -> insert_ahb_bridge (o7) - * -> get_ahb_bridge (o7) - * - * - * -> _nomem_find_apb (g2) - * -> get_ahb_bridge (o7) - * -> _nomem_find_ahb_bus (o7) - * -> _nomem_find_apb_bus (o7) - * -> _nomem_find_ahb (g2) - * -> get_ahb_bridge (o7) - * -> _nomem_find_ahb_bus (o7) - * -> mem_handler.func() (o7) - * - */ |