| /*------------------------------------------------------------------------------+ | |
| * | |
| * This souce code has been made available to you by EuroDesign | |
| * (www.eurodsn.de). It's based on the original IBM source code, so | |
| * this follows: | |
| * | |
| * This source code is dual-licensed. You may use it under the terms of the | |
| * GNU General Public License version 2, or under the license below. | |
| * | |
| * This source code has been made available to you by IBM on an AS-IS | |
| * basis. Anyone receiving this source is licensed under IBM | |
| * copyrights to use it in any way he or she deems fit, including | |
| * copying it, modifying it, compiling it, and redistributing it either | |
| * with or without modifications. No license under IBM patents or | |
| * patent applications is to be implied by the copyright license. | |
| * | |
| * Any user of this software should understand that IBM cannot provide | |
| * technical support for this software and will not be responsible for | |
| * any consequences resulting from the use of this software. | |
| * | |
| * Any person who transfers this source code or any derivative work | |
| * must include the IBM copyright notice, this paragraph, and the | |
| * preceding two paragraphs in the transferred software. | |
| * | |
| * COPYRIGHT I B M CORPORATION 1995 | |
| * LICENSED MATERIAL - PROGRAM PROPERTY OF I B M | |
| *------------------------------------------------------------------------------- */ | |
| #include <config.h> | |
| #include <asm/ppc4xx.h> | |
| #define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */ | |
| #include <ppc_asm.tmpl> | |
| #include <ppc_defs.h> | |
| #include <asm/cache.h> | |
| #include <asm/mmu.h> | |
| /** | |
| * ext_bus_cntlr_init - Initializes the External Bus Controller for the external peripherals | |
| * | |
| * IMPORTANT: For pass1 this code must run from cache since you can not | |
| * reliably change a peripheral banks timing register (pbxap) while running | |
| * code from that bank. For ex., since we are running from ROM on bank 0, we | |
| * can NOT execute the code that modifies bank 0 timings from ROM, so | |
| * we run it from cache. | |
| * | |
| * Bank 0 - Boot-Flash | |
| * Bank 1 - NAND-Flash | |
| * Bank 2 - ISA bus | |
| * Bank 3 - Second Flash | |
| * Bank 4 - USB controller | |
| */ | |
| .globl ext_bus_cntlr_init | |
| ext_bus_cntlr_init: | |
| /* | |
| * We need the current boot up configuration to set correct | |
| * timings into internal flash and external flash | |
| */ | |
| mfdcr r24,CPC0_PSR /* xxxx xxxx xxxx xxx? ?xxx xxxx xxxx xxxx | |
| 0 0 -> 8 bit external ROM | |
| 0 1 -> 16 bit internal ROM */ | |
| addi r4,0,2 | |
| srw r24,r24,r4 /* shift right r24 two positions */ | |
| andi. r24,r24,0x06000 | |
| /* | |
| * All calculations are based on 33MHz EBC clock. | |
| * | |
| * First, create a "very slow" timing (~250ns) with burst mode enabled | |
| * This is need for the external flash access | |
| */ | |
| lis r25,0x0800 | |
| ori r25,r25,0x0280 /* 0000 1000 0xxx 0000 0000 0010 100x xxxx = 0x03800280 | |
| /* | |
| * Second, create a fast timing: | |
| * 90ns first cycle - 3 clock access | |
| * and 90ns burst cycle, plus 1 clock after the last access | |
| * This is used for the internal access | |
| */ | |
| lis r26,0x8900 | |
| ori r26,r26,0x0280 /* 1000 1001 0xxx 0000 0000 0010 100x xxxx | |
| /* | |
| * We can't change settings on CS# if we currently use them. | |
| * -> load a few instructions into cache and run this code from cache | |
| */ | |
| mflr r4 /* save link register */ | |
| bl ..getAddr | |
| ..getAddr: | |
| mflr r3 /* get address of ..getAddr */ | |
| mtlr r4 /* restore link register */ | |
| addi r4,0,14 /* set ctr to 10; used to prefetch */ | |
| mtctr r4 /* 10 cache lines to fit this function | |
| in cache (gives us 8x10=80 instructions) */ | |
| ..ebcloop: | |
| icbt r0,r3 /* prefetch cache line for addr in r3 */ | |
| addi r3,r3,32 /* move to next cache line */ | |
| bdnz ..ebcloop /* continue for 10 cache lines */ | |
| /* | |
| * Delay to ensure all accesses to ROM are complete before changing | |
| * bank 0 timings. 200usec should be enough. | |
| * 200,000,000 (cycles/sec) X .000200 (sec) = 0x9C40 cycles | |
| */ | |
| lis r3,0x0 | |
| ori r3,r3,0xA000 /* ensure 200usec have passed since reset */ | |
| mtctr r3 | |
| ..spinlp: | |
| bdnz ..spinlp /* spin loop */ | |
| /*----------------------------------------------------------------------- | |
| * Memory Bank 0 (BOOT-ROM) initialization | |
| * 0xFFEF00000....0xFFFFFFF | |
| * We only have to change the timing. Mapping is ok by boot-strapping | |
| *----------------------------------------------------------------------- */ | |
| li r4,PB1AP /* PB0AP=Peripheral Bank 0 Access Parameters */ | |
| mtdcr EBC0_CFGADDR,r4 | |
| mr r4,r26 /* assume internal fast flash is boot flash */ | |
| cmpwi r24,0x2000 /* assumption true? ... */ | |
| beq 1f /* ...yes! */ | |
| mr r4,r25 /* ...no, use the slow variant */ | |
| mr r25,r26 /* use this for the other flash */ | |
| 1: | |
| mtdcr EBC0_CFGDATA,r4 /* change timing now */ | |
| li r4,PB0CR /* PB0CR=Peripheral Bank 0 Control Register */ | |
| mtdcr EBC0_CFGADDR,r4 | |
| mfdcr r4,EBC0_CFGDATA | |
| lis r3,0x0001 | |
| ori r3,r3,0x8000 /* allow reads and writes */ | |
| or r4,r4,r3 | |
| mtdcr EBC0_CFGDATA,r4 | |
| /*----------------------------------------------------------------------- | |
| * Memory Bank 3 (Second-Flash) initialization | |
| * 0xF0000000...0xF01FFFFF -> 2MB | |
| *----------------------------------------------------------------------- */ | |
| li r4,PB3AP /* Peripheral Bank 1 Access Parameter */ | |
| mtdcr EBC0_CFGADDR,r4 | |
| mtdcr EBC0_CFGDATA,r2 /* change timing */ | |
| li r4,PB3CR /* Peripheral Bank 1 Configuration Registers */ | |
| mtdcr EBC0_CFGADDR,r4 | |
| lis r4,0xF003 | |
| ori r4,r4,0x8000 | |
| /* | |
| * Consider boot configuration | |
| */ | |
| xori r24,r24,0x2000 /* invert current bus width */ | |
| or r4,r4,r24 | |
| mtdcr EBC0_CFGDATA,r4 | |
| /*----------------------------------------------------------------------- | |
| * Memory Bank 1 (NAND-Flash) initialization | |
| * 0x77D00000...0x77DFFFFF -> 1MB | |
| * - the write/read pulse to the NAND can be as short as 25ns, bus the cycle time is always 50ns | |
| * - the setup time is 0ns | |
| * - the hold time is 15ns | |
| * -> | |
| * - TWT = 0 | |
| * - CSN = 0 | |
| * - OEN = 0 | |
| * - WBN = 0 | |
| * - WBF = 0 | |
| * - TH = 1 | |
| * ----> 2 clocks per cycle = 60ns cycle (30ns active, 30ns hold) | |
| *----------------------------------------------------------------------- */ | |
| li r4,PB1AP /* Peripheral Bank 1 Access Parameter */ | |
| mtdcr EBC0_CFGADDR,r4 | |
| lis r4,0x0000 | |
| ori r4,r4,0x0200 | |
| mtdcr EBC0_CFGDATA,r4 | |
| li r4,PB1CR /* Peripheral Bank 1 Configuration Registers */ | |
| mtdcr EBC0_CFGADDR,r4 | |
| lis r4,0x77D1 | |
| ori r4,r4,0x8000 | |
| mtdcr EBC0_CFGDATA,r4 | |
| /* USB init (without acceleration) */ | |
| #ifndef CONFIG_ISP1161_PRESENT | |
| li r4,PB4AP /* PB4AP=Peripheral Bank 4 Access Parameters */ | |
| mtdcr EBC0_CFGADDR,r4 | |
| lis r4,0x0180 | |
| ori r4,r4,0x5940 | |
| mtdcr EBC0_CFGDATA,r4 | |
| #endif | |
| /*----------------------------------------------------------------------- | |
| * Memory Bank 2 (ISA Access) initialization (plus memory bank 6 and 7) | |
| * 0x78000000...0x7BFFFFFF -> 64 MB | |
| * Wir arbeiten bei 33 MHz -> 30ns | |
| *----------------------------------------------------------------------- | |
| A7 (ppc notation) or A24 (standard notation) decides about | |
| the type of access: | |
| A7/A24=0 -> memory cycle | |
| A7/ /A24=1 -> I/O cycle | |
| */ | |
| li r4,PB2AP /* PB2AP=Peripheral Bank 2 Access Parameters */ | |
| mtdcr EBC0_CFGADDR,r4 | |
| /* | |
| We emulate an ISA access | |
| 1. Address active | |
| 2. wait 0 EBC clocks -> CSN=0 | |
| 3. set CS# | |
| 4. wait 0 EBC clock -> OEN/WBN=0 | |
| 5. set OE#/WE# | |
| 6. wait 4 clocks (ca. 90ns) and for Ready signal | |
| 7. hold for 4 clocks -> TH=4 | |
| */ | |
| #if 1 | |
| /* faster access to isa-bus */ | |
| lis r4,0x0180 | |
| ori r4,r4,0x5940 | |
| #else | |
| lis r4,0x0100 | |
| ori r4,r4,0x0340 | |
| #endif | |
| mtdcr EBC0_CFGDATA,r4 | |
| #ifdef IDE_USES_ISA_EMULATION | |
| li r25,PB5AP /* PB5AP=Peripheral Bank 5 Access Parameters */ | |
| mtdcr EBC0_CFGADDR,r25 | |
| mtdcr EBC0_CFGDATA,r4 | |
| #endif | |
| li r25,PB6AP /* PB6AP=Peripheral Bank 6 Access Parameters */ | |
| mtdcr EBC0_CFGADDR,r25 | |
| mtdcr EBC0_CFGDATA,r4 | |
| li r25,PB7AP /* PB7AP=Peripheral Bank 7 Access Parameters */ | |
| mtdcr EBC0_CFGADDR,r25 | |
| mtdcr EBC0_CFGDATA,r4 | |
| li r25,PB2CR /* PB2CR=Peripheral Bank 2 Configuration Register */ | |
| mtdcr EBC0_CFGADDR,r25 | |
| lis r4,0x780B | |
| ori r4,r4,0xA000 | |
| mtdcr EBC0_CFGDATA,r4 | |
| /* | |
| * the other areas are only 1MiB in size | |
| */ | |
| lis r4,0x7401 | |
| ori r4,r4,0xA000 | |
| li r25,PB6CR /* PB6CR=Peripheral Bank 6 Configuration Register */ | |
| mtdcr EBC0_CFGADDR,r25 | |
| lis r4,0x7401 | |
| ori r4,r4,0xA000 | |
| mtdcr EBC0_CFGDATA,r4 | |
| li r25,PB7CR /* PB7CR=Peripheral Bank 7 Configuration Register */ | |
| mtdcr EBC0_CFGADDR,r25 | |
| lis r4,0x7411 | |
| ori r4,r4,0xA000 | |
| mtdcr EBC0_CFGDATA,r4 | |
| #ifndef CONFIG_ISP1161_PRESENT | |
| li r25,PB4CR /* PB4CR=Peripheral Bank 4 Configuration Register */ | |
| mtdcr EBC0_CFGADDR,r25 | |
| lis r4,0x7421 | |
| ori r4,r4,0xA000 | |
| mtdcr EBC0_CFGDATA,r4 | |
| #endif | |
| #ifdef IDE_USES_ISA_EMULATION | |
| li r25,PB5CR /* PB5CR=Peripheral Bank 5 Configuration Register */ | |
| mtdcr EBC0_CFGADDR,r25 | |
| lis r4,0x0000 | |
| ori r4,r4,0x0000 | |
| mtdcr EBC0_CFGDATA,r4 | |
| #endif | |
| /*----------------------------------------------------------------------- | |
| * Memory bank 4: USB controller Philips ISP6111 | |
| * 0x77C00000 ... 0x77CFFFFF | |
| * | |
| * The chip is connected to: | |
| * - CPU CS#4 | |
| * - CPU IRQ#2 | |
| * - CPU DMA 3 | |
| * | |
| * Timing: | |
| * - command to first data: 300ns. Software must ensure this timing! | |
| * - Write pulse: 26ns | |
| * - Read pulse: 33ns | |
| * - read cycle time: 150ns | |
| * - write cycle time: 140ns | |
| * | |
| * Note: All calculations are based on 33MHz EBC clock. One '#' or '_' is 30ns | |
| * | |
| * |- 300ns --| | |
| * |---- 420ns ---|---- 420ns ---| cycle | |
| * CS ############:###____#######:###____####### | |
| * OE ############:####___#######:####___####### | |
| * WE ############:####__########:####__######## | |
| * | |
| * ----> 2 clocks RD/WR pulses: 60ns | |
| * ----> CSN: 3 clock, 90ns | |
| * ----> OEN: 1 clocks (read cycle) | |
| * ----> WBN: 1 clocks (write cycle) | |
| * ----> WBE: 2 clocks | |
| * ----> TH: 7 clock, 210ns | |
| * ----> TWT: 7 clocks | |
| *----------------------------------------------------------------------- */ | |
| #ifdef CONFIG_ISP1161_PRESENT | |
| li r4,PB4AP /* PB4AP=Peripheral Bank 4 Access Parameters */ | |
| mtdcr EBC0_CFGADDR,r4 | |
| lis r4,0x030D | |
| ori r4,r4,0x5E80 | |
| mtdcr EBC0_CFGDATA,r4 | |
| li r4,PB4CR /* PB2CR=Peripheral Bank 4 Configuration Register */ | |
| mtdcr EBC0_CFGADDR,r4 | |
| lis r4,0x77C1 | |
| ori r4,r4,0xA000 | |
| mtdcr EBC0_CFGDATA,r4 | |
| #endif | |
| #ifndef IDE_USES_ISA_EMULATION | |
| /*----------------------------------------------------------------------- | |
| * Memory Bank 5 used for IDE access | |
| * | |
| * Timings for IDE Interface | |
| * | |
| * SETUP / LENGTH / HOLD - cycles valid for 33.3 MHz clk -> 30ns cycle time | |
| * 70 165 30 PIO-Mode 0, [ns] | |
| * 3 6 1 [Cycles] ----> AP=0x040C0200 | |
| * 50 125 20 PIO-Mode 1, [ns] | |
| * 2 5 1 [Cycles] ----> AP=0x03080200 | |
| * 30 100 15 PIO-Mode 2, [ns] | |
| * 1 4 1 [Cycles] ----> AP=0x02040200 | |
| * 30 80 10 PIO-Mode 3, [ns] | |
| * 1 3 1 [Cycles] ----> AP=0x01840200 | |
| * 25 70 10 PIO-Mode 4, [ns] | |
| * 1 3 1 [Cycles] ----> AP=0x01840200 | |
| * | |
| *----------------------------------------------------------------------- */ | |
| li r4,PB5AP | |
| mtdcr EBC0_CFGADDR,r4 | |
| lis r4,0x040C | |
| ori r4,r4,0x0200 | |
| mtdcr EBC0_CFGDATA,r4 | |
| li r4,PB5CR /* PB2CR=Peripheral Bank 2 Configuration Register */ | |
| mtdcr EBC0_CFGADDR,r4 | |
| lis r4,0x7A01 | |
| ori r4,r4,0xA000 | |
| mtdcr EBC0_CFGDATA,r4 | |
| #endif | |
| /* | |
| * External Peripheral Control Register | |
| */ | |
| li r4,EBC0_CFG | |
| mtdcr EBC0_CFGADDR,r4 | |
| lis r4,0xB84E | |
| ori r4,r4,0xF000 | |
| mtdcr EBC0_CFGDATA,r4 | |
| /* | |
| * drive POST code | |
| */ | |
| lis r4,0x7900 | |
| ori r4,r4,0x0080 | |
| li r3,0x0001 | |
| stb r3,0(r4) /* 01 -> external bus controller is initialized */ | |
| nop /* pass2 DCR errata #8 */ | |
| blr |