mirror of https://gitee.com/openkylin/linux.git
132 lines
3.3 KiB
C
132 lines
3.3 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_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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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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}
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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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ft_init(_dtb_start, _dtb_end - _dtb_start, 32);
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serial_console_init();
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}
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