On Fri, Aug 31, 2007 at 03:04:55PM -0500, Josh Boyer wrote:
> Add zImage wrapper for walnut board
>
> Signed-off-by: Josh Boyer <[EMAIL PROTECTED]>
[snip]
> --- /dev/null
> +++ linux-2.6/arch/powerpc/boot/treeboot-walnut.c
> @@ -0,0 +1,133 @@
> +/*
> + * Old U-boot compatibility for Walnut
> + *
> + * Author: Josh Boyer <[EMAIL PROTECTED]>
> + *
> + * 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(0xb0);
Please add #defines for the DCR numbers, rather than using literals.
> + u32 cpc0_cr0 = mfdcr(0xb1);
> + u32 cpc0_cr1 = mfdcr(0xb2);
> + 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(0xb2, 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/[EMAIL PROTECTED]", uart0);
> + dt_fixup_clock("/plb/opb/[EMAIL PROTECTED]", 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);
> +
> + printf("FPGA_BRDS1: %08x\n", fpga_brds1);
> +
> + 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();
> +}
>
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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