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0d279d4761
This patch contains a handful of small fixes to allow the Ebony's flash to be exposed as MTD devices via the physmap_of driver. Specifically it: - Makes a small addition to the device tree and zImage wrapper to record the correct address for the flash in the device tree based on the board switches as reported via an FPGA register. - Prohibits building the old hard-coded "Ebony" flash map on arch/powerpc kernels, in favour of using physmap_of's device tree based approach. - Enables MTD and physmap_of in the Ebony defconfig. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
154 lines
3.9 KiB
C
154 lines
3.9 KiB
C
/*
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* Copyright 2007 David Gibson, IBM Corporation.
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*
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* Based on earlier code:
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* Copyright (C) Paul Mackerras 1997.
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*
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* Matt Porter <mporter@kernel.crashing.org>
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* Copyright 2002-2005 MontaVista Software Inc.
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*
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* Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
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* Copyright (c) 2003, 2004 Zultys Technologies
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <stdarg.h>
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#include <stddef.h>
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#include "types.h"
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#include "elf.h"
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#include "string.h"
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#include "stdio.h"
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#include "page.h"
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#include "ops.h"
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#include "reg.h"
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#include "io.h"
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#include "dcr.h"
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#include "44x.h"
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extern char _dtb_start[];
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extern char _dtb_end[];
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static u8 *ebony_mac0, *ebony_mac1;
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/* Calculate 440GP clocks */
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void ibm440gp_fixup_clocks(unsigned int sysclk, unsigned int ser_clk)
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{
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u32 sys0 = mfdcr(DCRN_CPC0_SYS0);
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u32 cr0 = mfdcr(DCRN_CPC0_CR0);
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u32 cpu, plb, opb, ebc, tb, uart0, uart1, m;
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u32 opdv = CPC0_SYS0_OPDV(sys0);
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u32 epdv = CPC0_SYS0_EPDV(sys0);
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if (sys0 & CPC0_SYS0_BYPASS) {
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/* Bypass system PLL */
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cpu = plb = sysclk;
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} else {
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if (sys0 & CPC0_SYS0_EXTSL)
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/* PerClk */
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m = CPC0_SYS0_FWDVB(sys0) * opdv * epdv;
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else
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/* CPU clock */
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m = CPC0_SYS0_FBDV(sys0) * CPC0_SYS0_FWDVA(sys0);
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cpu = sysclk * m / CPC0_SYS0_FWDVA(sys0);
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plb = sysclk * m / CPC0_SYS0_FWDVB(sys0);
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}
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opb = plb / opdv;
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ebc = opb / epdv;
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/* FIXME: Check if this is for all 440GP, or just Ebony */
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if ((mfpvr() & 0xf0000fff) == 0x40000440)
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/* Rev. B 440GP, use external system clock */
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tb = sysclk;
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else
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/* Rev. C 440GP, errata force us to use internal clock */
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tb = cpu;
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if (cr0 & CPC0_CR0_U0EC)
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/* External UART clock */
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uart0 = ser_clk;
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else
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/* Internal UART clock */
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uart0 = plb / CPC0_CR0_UDIV(cr0);
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if (cr0 & CPC0_CR0_U1EC)
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/* External UART clock */
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uart1 = ser_clk;
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else
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/* Internal UART clock */
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uart1 = plb / CPC0_CR0_UDIV(cr0);
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printf("PPC440GP: SysClk = %dMHz (%x)\n\r",
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(sysclk + 500000) / 1000000, sysclk);
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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/opb/ebc", ebc);
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dt_fixup_clock("/plb/opb/serial@40000200", uart0);
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dt_fixup_clock("/plb/opb/serial@40000300", uart1);
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}
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#define EBONY_FPGA_PATH "/plb/opb/ebc/fpga"
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#define EBONY_FPGA_FLASH_SEL 0x01
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#define EBONY_SMALL_FLASH_PATH "/plb/opb/ebc/small-flash"
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static void ebony_flashsel_fixup(void)
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{
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void *devp;
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u32 reg[3] = {0x0, 0x0, 0x80000};
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u8 *fpga;
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u8 fpga_reg0 = 0x0;
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devp = finddevice(EBONY_FPGA_PATH);
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if (!devp)
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fatal("Couldn't locate FPGA node %s\n\r", EBONY_FPGA_PATH);
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if (getprop(devp, "virtual-reg", &fpga, sizeof(fpga)) != sizeof(fpga))
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fatal("%s has missing or invalid virtual-reg property\n\r",
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EBONY_FPGA_PATH);
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fpga_reg0 = in_8(fpga);
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devp = finddevice(EBONY_SMALL_FLASH_PATH);
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if (!devp)
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fatal("Couldn't locate small flash node %s\n\r",
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EBONY_SMALL_FLASH_PATH);
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if (getprop(devp, "reg", reg, sizeof(reg)) != sizeof(reg))
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fatal("%s has reg property of unexpected size\n\r",
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EBONY_SMALL_FLASH_PATH);
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/* Invert address bit 14 (IBM-endian) if FLASH_SEL fpga bit is set */
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if (fpga_reg0 & EBONY_FPGA_FLASH_SEL)
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reg[1] ^= 0x80000;
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setprop(devp, "reg", reg, sizeof(reg));
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}
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static void ebony_fixups(void)
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{
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// FIXME: sysclk should be derived by reading the FPGA registers
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unsigned long sysclk = 33000000;
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ibm440gp_fixup_clocks(sysclk, 6 * 1843200);
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ibm44x_fixup_memsize();
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dt_fixup_mac_addresses(ebony_mac0, ebony_mac1);
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ibm4xx_fixup_ebc_ranges("/plb/opb/ebc");
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ebony_flashsel_fixup();
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}
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void ebony_init(void *mac0, void *mac1)
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{
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platform_ops.fixups = ebony_fixups;
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platform_ops.exit = ibm44x_dbcr_reset;
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ebony_mac0 = mac0;
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ebony_mac1 = mac1;
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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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