/* * Copyright (c) 2004 Picture Elements, Inc. * Stephen Williams (steve@icarus.com) * * SPDX-License-Identifier: GPL-2.0+ */ # include <common.h> # include <asm/ppc4xx.h> # include <asm/processor.h> # include <asm/io.h> # include "jse_priv.h" /* * This function is run very early, out of flash, and before devices are * initialized. It is called by arch/powerpc/lib/board.c:board_init_f by virtue * of being in the init_sequence array. * * The SDRAM has been initialized already -- start.S:start called * init.S:init_sdram early on -- but it is not yet being used for * anything, not even stack. So be careful. */ int board_early_init_f (void) { /*-------------------------------------------------------------------------+ | Interrupt controller setup for the JSE board. | Note: IRQ 0-15 405GP internally generated; active high; level sensitive | IRQ 16 405GP internally generated; active low; level sensitive | IRQ 17-24 RESERVED/UNUSED | IRQ 25 (EXT IRQ 0) PCI SLOT 0; active low; level sensitive | IRQ 26 (EXT IRQ 1) PCI SLOT 1; active low; level sensitive | IRQ 27 (EXT IRQ 2) JP2C CHIP ; active low; level sensitive | IRQ 28 (EXT IRQ 3) PCI bridge; active low; level sensitive | IRQ 29 (EXT IRQ 4) SystemACE IRQ; active high | IRQ 30 (EXT IRQ 5) SystemACE BRdy (unused) | IRQ 31 (EXT IRQ 6) (unused) +-------------------------------------------------------------------------*/ mtdcr (UIC0SR, 0xFFFFFFFF); /* clear all ints */ mtdcr (UIC0ER, 0x00000000); /* disable all ints */ mtdcr (UIC0CR, 0x00000000); /* set all to be non-critical */ mtdcr (UIC0PR, 0xFFFFFF87); /* set int polarities */ mtdcr (UIC0TR, 0x10000000); /* set int trigger levels */ mtdcr (UIC0SR, 0xFFFFFFFF); /* clear all ints */ /* Configure the interface to the SystemACE MCU port. The SystemACE is fast, but there is no reason to have excessivly tight timings. So the settings are slightly generous. */ /* EBC0_B1AP: BME=1, TWT=2, CSN=0, OEN=1, WBN=0, WBF=1, TH=0, RE=0, SOR=0, BEM=0, PEN=0 */ mtdcr (EBC0_CFGADDR, PB1AP); mtdcr (EBC0_CFGDATA, 0x01011000); /* EBC0_B1CR: BAS=x, BS=0(1MB), BU=3(R/W), BW=0(8bits) */ mtdcr (EBC0_CFGADDR, PB1CR); mtdcr (EBC0_CFGDATA, CONFIG_SYS_SYSTEMACE_BASE | 0x00018000); /* Enable the /PerWE output as /PerWE, instead of /PCIINT. */ /* CPC0_CR1 |= PCIPW */ mtdcr (0xb2, mfdcr (0xb2) | 0x00004000); return 0; } #ifdef CONFIG_BOARD_PRE_INIT int board_pre_init (void) { return board_early_init_f (); } #endif /* * This function is also called by arch/powerpc/lib/board.c:board_init_f (it is * also in the init_sequence array) but later. Many more things are * configured, but we are still running from flash. */ int checkboard (void) { unsigned vers, status; /* check that the SystemACE chip is alive. */ printf ("ACE: "); vers = readw (CONFIG_SYS_SYSTEMACE_BASE + 0x16); printf ("SystemACE %u.%u (build %u)", (vers >> 12) & 0x0f, (vers >> 8) & 0x0f, vers & 0xff); status = readl (CONFIG_SYS_SYSTEMACE_BASE + 0x04); #ifdef DEBUG printf (" STATUS=0x%08x", status); #endif /* If the flash card is present and there is an initial error, then force a restart of the program. */ if (status & 0x00000010) { printf (" CFDETECT"); if (status & 0x04) { /* CONTROLREG = CFGPROG */ writew (0x1000, CONFIG_SYS_SYSTEMACE_BASE + 0x18); udelay (500); /* CONTROLREG = CFGRESET */ writew (0x0080, CONFIG_SYS_SYSTEMACE_BASE + 0x18); udelay (500); writew (0x0000, CONFIG_SYS_SYSTEMACE_BASE + 0x18); /* CONTROLREG = CFGSTART */ writew (0x0020, CONFIG_SYS_SYSTEMACE_BASE + 0x18); status = readl (CONFIG_SYS_SYSTEMACE_BASE + 0x04); } } /* Wait for the SystemACE to program its chain of devices. */ while ((status & 0x84) == 0x00) { udelay (500); status = readl (CONFIG_SYS_SYSTEMACE_BASE + 0x04); } if (status & 0x04) printf (" CFG-ERROR"); if (status & 0x80) printf (" CFGDONE"); printf ("\n"); /* Force /RTS to active. The board it not wired quite correctly to use cts/rtc flow control, so just force the /RST active and forget about it. */ writeb (readb (0xef600404) | 0x03, 0xef600404); printf ("JSE: ready\n"); return 0; } /* **** No more functions called by board_init_f. **** */ /* * This function is called by arch/powerpc/lib/board.c:board_init_r. At this * point, basic setup is done, U-Boot has been moved into SDRAM and * PCI has been set up. From here we done late setup. */ int misc_init_r (void) { host_bridge_init (); return 0; }