2f0dfeaa84
This incorporates libfdt (from the source embedded in an earlier commit) into the wrapper.a library used by the bootwrapper. This includes adding a libfdt_env.h file, which the libfdt sources need in order to integrate into the bootwrapper environment, and a libfdt-wrapper.c which provides glue to connect the bootwrapper's abstract device tree callbacks to the libfdt functions. In addition, this changes the various wrapper and platform files to use libfdt functions instead of the older flatdevtree.c library. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
134 lines
3.4 KiB
C
134 lines
3.4 KiB
C
/*
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* Old U-boot compatibility for Walnut
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*
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* Author: Josh Boyer <jwboyer@linux.vnet.ibm.com>
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*
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* Copyright 2007 IBM Corporation
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* Based on cuboot-83xx.c, which is:
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* Copyright (c) 2007 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include "ops.h"
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#include "stdio.h"
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#include "dcr.h"
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#include "4xx.h"
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#include "io.h"
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BSS_STACK(4096);
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void ibm405gp_fixup_clocks(unsigned int sysclk, unsigned int ser_clk)
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{
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u32 pllmr = mfdcr(DCRN_CPC0_PLLMR);
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u32 cpc0_cr0 = mfdcr(DCRN_405_CPC0_CR0);
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u32 cpc0_cr1 = mfdcr(DCRN_405_CPC0_CR1);
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u32 cpu, plb, opb, ebc, tb, uart0, uart1, m;
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u32 fwdv, fbdv, cbdv, opdv, epdv, udiv;
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fwdv = (8 - ((pllmr & 0xe0000000) >> 29));
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fbdv = (pllmr & 0x1e000000) >> 25;
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cbdv = ((pllmr & 0x00060000) >> 17) + 1;
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opdv = ((pllmr & 0x00018000) >> 15) + 1;
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epdv = ((pllmr & 0x00001800) >> 13) + 2;
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udiv = ((cpc0_cr0 & 0x3e) >> 1) + 1;
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m = fwdv * fbdv * cbdv;
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cpu = sysclk * m / fwdv;
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plb = cpu / cbdv;
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opb = plb / opdv;
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ebc = plb / epdv;
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if (cpc0_cr0 & 0x80) {
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/* uart0 uses the external clock */
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uart0 = ser_clk;
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} else {
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uart0 = cpu / udiv;
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}
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if (cpc0_cr0 & 0x40) {
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/* uart1 uses the external clock */
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uart1 = ser_clk;
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} else {
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uart1 = cpu / udiv;
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}
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/* setup the timebase clock to tick at the cpu frequency */
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cpc0_cr1 = cpc0_cr1 & ~0x00800000;
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mtdcr(DCRN_405_CPC0_CR1, cpc0_cr1);
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tb = cpu;
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dt_fixup_cpu_clocks(cpu, tb, 0);
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dt_fixup_clock("/plb", plb);
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dt_fixup_clock("/plb/opb", opb);
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dt_fixup_clock("/plb/ebc", ebc);
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dt_fixup_clock("/plb/opb/serial@ef600300", uart0);
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dt_fixup_clock("/plb/opb/serial@ef600400", uart1);
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}
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static void walnut_flashsel_fixup(void)
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{
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void *devp, *sram;
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u32 reg_flash[3] = {0x0, 0x0, 0x80000};
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u32 reg_sram[3] = {0x0, 0x0, 0x80000};
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u8 *fpga;
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u8 fpga_brds1 = 0x0;
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devp = finddevice("/plb/ebc/fpga");
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if (!devp)
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fatal("Couldn't locate FPGA node\n\r");
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if (getprop(devp, "virtual-reg", &fpga, sizeof(fpga)) != sizeof(fpga))
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fatal("no virtual-reg property\n\r");
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fpga_brds1 = in_8(fpga);
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devp = finddevice("/plb/ebc/flash");
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if (!devp)
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fatal("Couldn't locate flash node\n\r");
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if (getprop(devp, "reg", reg_flash, sizeof(reg_flash)) != sizeof(reg_flash))
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fatal("flash reg property has unexpected size\n\r");
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sram = finddevice("/plb/ebc/sram");
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if (!sram)
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fatal("Couldn't locate sram node\n\r");
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if (getprop(sram, "reg", reg_sram, sizeof(reg_sram)) != sizeof(reg_sram))
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fatal("sram reg property has unexpected size\n\r");
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if (fpga_brds1 & 0x1) {
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reg_flash[1] ^= 0x80000;
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reg_sram[1] ^= 0x80000;
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}
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setprop(devp, "reg", reg_flash, sizeof(reg_flash));
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setprop(sram, "reg", reg_sram, sizeof(reg_sram));
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}
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#define WALNUT_OPENBIOS_MAC_OFF 0xfffffe0b
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static void walnut_fixups(void)
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{
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ibm4xx_fixup_memsize();
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ibm405gp_fixup_clocks(33330000, 0xa8c000);
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ibm4xx_quiesce_eth((u32 *)0xef600800, NULL);
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ibm4xx_fixup_ebc_ranges("/plb/ebc");
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walnut_flashsel_fixup();
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dt_fixup_mac_addresses((u8 *) WALNUT_OPENBIOS_MAC_OFF);
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}
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void platform_init(void)
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{
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unsigned long end_of_ram = 0x2000000;
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unsigned long avail_ram = end_of_ram - (unsigned long) _end;
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simple_alloc_init(_end, avail_ram, 32, 32);
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platform_ops.fixups = walnut_fixups;
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platform_ops.exit = ibm40x_dbcr_reset;
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fdt_init(_dtb_start);
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serial_console_init();
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}
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