/* * SPDX-License-Identifier: GPL-2.0 IBM-pibs */ #include <config.h> #include <asm/ppc4xx.h> #include <ppc_asm.tmpl> #include <ppc_defs.h> #include <asm/cache.h> #include <asm/mmu.h> #define LI32(reg,val) \ addis reg,0,val@h;\ ori reg,reg,val@l #define WDCR_EBC(reg,val) \ addi r4,0,reg;\ mtdcr EBC0_CFGADDR,r4;\ addis r4,0,val@h;\ ori r4,r4,val@l;\ mtdcr EBC0_CFGDATA,r4 #define WDCR_SDRAM(reg,val) \ addi r4,0,reg;\ mtdcr SDRAM0_CFGADDR,r4;\ addis r4,0,val@h;\ ori r4,r4,val@l;\ mtdcr SDRAM0_CFGDATA,r4 /****************************************************************************** * Function: ext_bus_cntlr_init * * Description: Configures EBC Controller and a few basic chip selects. * * CS0 is setup to get the Boot Flash out of the addresss range * so that we may setup a stack. CS7 is setup so that we can * access and reset the hardware watchdog. * * 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. * * Notes: Does NOT use the stack. *****************************************************************************/ .section ".text" .align 2 .globl ext_bus_cntlr_init .type ext_bus_cntlr_init, @function ext_bus_cntlr_init: mflr r0 /******************************************************************** * Prefetch entire ext_bus_cntrl_init function into the icache. * This is necessary because we are going to change the same CS we * are executing from. Otherwise a CPU lockup may occur. *******************************************************************/ bl ..getAddr ..getAddr: mflr r3 /* get address of ..getAddr */ /* Calculate number of cache lines for this function */ addi r4, 0, (((.Lfe0 - ..getAddr) / CONFIG_SYS_CACHELINE_SIZE) + 2) mtctr r4 ..ebcloop: icbt r0, r3 /* prefetch cache line for addr in r3*/ addi r3, r3, CONFIG_SYS_CACHELINE_SIZE /* move to next cache line */ bdnz ..ebcloop /* continue for $CTR 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. *******************************************************************/ addis r3, 0, 0x0 ori r3, r3, 0xA000 /* wait 200us from reset */ mtctr r3 ..spinlp: bdnz ..spinlp /* spin loop */ /******************************************************************** * SETUP CPC0_CR0 *******************************************************************/ LI32(r4, 0x007000c0) mtdcr CPC0_CR0, r4 /******************************************************************** * Setup CPC0_CR1: Change PCIINT signal to PerWE *******************************************************************/ mfdcr r4, CPC0_CR1 ori r4, r4, 0x4000 mtdcr CPC0_CR1, r4 /******************************************************************** * Setup External Bus Controller (EBC). *******************************************************************/ WDCR_EBC(EBC0_CFG, 0xd84c0000) /******************************************************************** * Memory Bank 0 (Intel 28F128J3 Flash) initialization *******************************************************************/ /*WDCR_EBC(PB1AP, 0x02869200)*/ WDCR_EBC(PB1AP, 0x07869200) WDCR_EBC(PB0CR, 0xfe0bc000) /******************************************************************** * Memory Bank 1 (Holtek HT6542B PS/2) initialization *******************************************************************/ WDCR_EBC(PB1AP, 0x1f869200) WDCR_EBC(PB1CR, 0xf0818000) /******************************************************************** * Memory Bank 2 (Epson S1D13506) initialization *******************************************************************/ WDCR_EBC(PB2AP, 0x05860300) WDCR_EBC(PB2CR, 0xf045a000) /******************************************************************** * Memory Bank 3 (Philips SJA1000 CAN Controllers) initialization *******************************************************************/ WDCR_EBC(PB3AP, 0x0387d200) WDCR_EBC(PB3CR, 0xf021c000) /******************************************************************** * Memory Bank 4-7 (Unused) initialization *******************************************************************/ WDCR_EBC(PB4AP, 0) WDCR_EBC(PB4CR, 0) WDCR_EBC(PB5AP, 0) WDCR_EBC(PB5CR, 0) WDCR_EBC(PB6AP, 0) WDCR_EBC(PB6CR, 0) WDCR_EBC(PB7AP, 0) WDCR_EBC(PB7CR, 0) /* We are all done */ mtlr r0 /* Restore link register */ blr /* Return to calling function */ .Lfe0: .size ext_bus_cntlr_init,.Lfe0-ext_bus_cntlr_init /* end ext_bus_cntlr_init() */ /****************************************************************************** * Function: sdram_init * * Description: Configures SDRAM memory banks. * * Notes: Does NOT use the stack. *****************************************************************************/ .section ".text" .align 2 .globl sdram_init .type sdram_init, @function sdram_init: /* * Disable memory controller to allow * values to be changed. */ WDCR_SDRAM(SDRAM0_CFG, 0x00000000) /* * Configure Memory Banks */ WDCR_SDRAM(SDRAM0_B0CR, 0x00084001) WDCR_SDRAM(SDRAM0_B1CR, 0x00000000) WDCR_SDRAM(SDRAM0_B2CR, 0x00000000) WDCR_SDRAM(SDRAM0_B3CR, 0x00000000) /* * Set up SDTR1 (SDRAM Timing Register) */ WDCR_SDRAM(SDRAM0_TR, 0x00854009) /* * Set RTR (Refresh Timing Register) */ WDCR_SDRAM(SDRAM0_RTR, 0x10000000) /* WDCR_SDRAM(SDRAM0_RTR, 0x05f00000) */ /******************************************************************** * Delay to ensure 200usec have elapsed since reset. Assume worst * case that the core is running 200Mhz: * 200,000,000 (cycles/sec) X .000200 (sec) = 0x9C40 cycles *******************************************************************/ addis r3, 0, 0x0000 ori r3, r3, 0xA000 /* Wait >200us from reset */ mtctr r3 ..spinlp2: bdnz ..spinlp2 /* spin loop */ /******************************************************************** * Set memory controller options reg, MCOPT1. *******************************************************************/ WDCR_SDRAM(SDRAM0_CFG,0x80800000) ..sdri_done: blr /* Return to calling function */ .Lfe1: .size sdram_init,.Lfe1-sdram_init /* end sdram_init() */