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/*
* Old U-boot compatibility for Walnut
*
* Author: Josh Boyer <jwboyer@linux.vnet.ibm.com>
*
* Copyright 2007 IBM Corporation
* Based on cuboot-83xx.c, which is:
* Copyright (c) 2007 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation.
*/
#include "ops.h"
#include "stdio.h"
#include "dcr.h"
#include "4xx.h"
#include "io.h"
BSS_STACK(4096);
void ibm405gp_fixup_clocks(unsigned int sysclk, unsigned int ser_clk)
{
u32 pllmr = mfdcr(DCRN_CPC0_PLLMR);
u32 cpc0_cr0 = mfdcr(DCRN_405_CPC0_CR0);
u32 cpc0_cr1 = mfdcr(DCRN_405_CPC0_CR1);
u32 cpu, plb, opb, ebc, tb, uart0, uart1, m;
u32 fwdv, fbdv, cbdv, opdv, epdv, udiv;
fwdv = (8 - ((pllmr & 0xe0000000) >> 29));
fbdv = (pllmr & 0x1e000000) >> 25;
cbdv = ((pllmr & 0x00060000) >> 17) + 1;
opdv = ((pllmr & 0x00018000) >> 15) + 1;
epdv = ((pllmr & 0x00001800) >> 13) + 2;
udiv = ((cpc0_cr0 & 0x3e) >> 1) + 1;
m = fwdv * fbdv * cbdv;
cpu = sysclk * m / fwdv;
plb = cpu / cbdv;
opb = plb / opdv;
ebc = plb / epdv;
if (cpc0_cr0 & 0x80) {
/* uart0 uses the external clock */
uart0 = ser_clk;
} else {
uart0 = cpu / udiv;
}
if (cpc0_cr0 & 0x40) {
/* uart1 uses the external clock */
uart1 = ser_clk;
} else {
uart1 = cpu / udiv;
}
/* setup the timebase clock to tick at the cpu frequency */
cpc0_cr1 = cpc0_cr1 & ~ 0x00800000;
mtdcr(DCRN_CPC0_CR1, cpc0_cr1);
tb = cpu;
dt_fixup_cpu_clocks(cpu, tb, 0);
dt_fixup_clock("/plb", plb);
dt_fixup_clock("/plb/opb", opb);
dt_fixup_clock("/plb/ebc", ebc);
dt_fixup_clock("/plb/opb/serial@ef600300", uart0);
dt_fixup_clock("/plb/opb/serial@ef600400", uart1);
}
static void walnut_flashsel_fixup(void)
{
void *devp, *sram;
u32 reg_flash[3] = {0x0, 0x0, 0x80000};
u32 reg_sram[3] = {0x0, 0x0, 0x80000};
u8 *fpga;
u8 fpga_brds1 = 0x0;
devp = finddevice("/plb/ebc/fpga");
if (!devp)
fatal("Couldn't locate FPGA node\n\r");
if (getprop(devp, "virtual-reg", &fpga, sizeof(fpga)) != sizeof(fpga))
fatal("no virtual-reg property\n\r");
fpga_brds1 = in_8(fpga);
devp = finddevice("/plb/ebc/flash");
if (!devp)
fatal("Couldn't locate flash node\n\r");
if (getprop(devp, "reg", reg_flash, sizeof(reg_flash)) != sizeof(reg_flash))
fatal("flash reg property has unexpected size\n\r");
sram = finddevice("/plb/ebc/sram");
if (!sram)
fatal("Couldn't locate sram node\n\r");
if (getprop(sram, "reg", reg_sram, sizeof(reg_sram)) != sizeof(reg_sram))
fatal("sram reg property has unexpected size\n\r");
if (fpga_brds1 & 0x1) {
reg_flash[1] ^= 0x80000;
reg_sram[1] ^= 0x80000;
}
setprop(devp, "reg", reg_flash, sizeof(reg_flash));
setprop(sram, "reg", reg_sram, sizeof(reg_sram));
}
static void walnut_fixups(void)
{
ibm4xx_fixup_memsize();
ibm405gp_fixup_clocks(33330000, 0xa8c000);
ibm4xx_quiesce_eth((u32 *)0xef600800, NULL);
ibm4xx_fixup_ebc_ranges("/plb/ebc");
walnut_flashsel_fixup();
}
void platform_init(void)
{
unsigned long end_of_ram = 0x2000000;
unsigned long avail_ram = end_of_ram - (unsigned long) _end;
simple_alloc_init(_end, avail_ram, 32, 32);
platform_ops.fixups = walnut_fixups;
platform_ops.exit = ibm40x_dbcr_reset;
ft_init(_dtb_start, _dtb_end - _dtb_start, 32);
serial_console_init();
}
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