powerpc/40x: Add cuboot wrapper for Acadia board
This adds a cuboot wrapper for the AMCC PowerPC 405EZ Acadia board. The clocking code is derived from U-Boot, originally written by Stefan Roese. Signed-off-by: Josh Boyer <jwboyer@linux.ibm.com>
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Josh Boyer
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8105fa8859
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@ -68,7 +68,8 @@ src-plat := of.c cuboot-52xx.c cuboot-824x.c cuboot-83xx.c cuboot-85xx.c holly.c
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fixed-head.S ep88xc.c ep405.c cuboot-c2k.c \
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cuboot-katmai.c cuboot-rainier.c redboot-8xx.c ep8248e.c \
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cuboot-warp.c cuboot-85xx-cpm2.c cuboot-yosemite.c simpleboot.c \
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virtex405-head.S virtex.c redboot-83xx.c cuboot-sam440ep.c
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virtex405-head.S virtex.c redboot-83xx.c cuboot-sam440ep.c \
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cuboot-acadia.c
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src-boot := $(src-wlib) $(src-plat) empty.c
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src-boot := $(addprefix $(obj)/, $(src-boot))
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@ -211,6 +212,7 @@ image-$(CONFIG_DEFAULT_UIMAGE) += uImage
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# Board ports in arch/powerpc/platform/40x/Kconfig
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image-$(CONFIG_EP405) += dtbImage.ep405
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image-$(CONFIG_WALNUT) += treeImage.walnut
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image-$(CONFIG_ACADIA) += cuImage.acadia
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# Board ports in arch/powerpc/platform/44x/Kconfig
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image-$(CONFIG_EBONY) += treeImage.ebony cuImage.ebony
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@ -0,0 +1,174 @@
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/*
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* Old U-boot compatibility for Acadia
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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 2008 IBM Corporation
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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 "io.h"
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#include "dcr.h"
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#include "stdio.h"
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#include "4xx.h"
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#include "44x.h"
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#include "cuboot.h"
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#define TARGET_4xx
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#include "ppcboot.h"
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static bd_t bd;
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#define CPR_PERD0_SPIDV_MASK 0x000F0000 /* SPI Clock Divider */
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#define PLLC_SRC_MASK 0x20000000 /* PLL feedback source */
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#define PLLD_FBDV_MASK 0x1F000000 /* PLL feedback divider value */
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#define PLLD_FWDVA_MASK 0x000F0000 /* PLL forward divider A value */
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#define PLLD_FWDVB_MASK 0x00000700 /* PLL forward divider B value */
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#define PRIMAD_CPUDV_MASK 0x0F000000 /* CPU Clock Divisor Mask */
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#define PRIMAD_PLBDV_MASK 0x000F0000 /* PLB Clock Divisor Mask */
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#define PRIMAD_OPBDV_MASK 0x00000F00 /* OPB Clock Divisor Mask */
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#define PRIMAD_EBCDV_MASK 0x0000000F /* EBC Clock Divisor Mask */
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#define PERD0_PWMDV_MASK 0xFF000000 /* PWM Divider Mask */
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#define PERD0_SPIDV_MASK 0x000F0000 /* SPI Divider Mask */
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#define PERD0_U0DV_MASK 0x0000FF00 /* UART 0 Divider Mask */
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#define PERD0_U1DV_MASK 0x000000FF /* UART 1 Divider Mask */
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static void get_clocks(void)
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{
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unsigned long sysclk, cpr_plld, cpr_pllc, cpr_primad, plloutb, i;
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unsigned long pllFwdDiv, pllFwdDivB, pllFbkDiv, pllPlbDiv, pllExtBusDiv;
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unsigned long pllOpbDiv, freqEBC, freqUART, freqOPB;
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unsigned long div; /* total divisor udiv * bdiv */
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unsigned long umin; /* minimum udiv */
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unsigned short diff; /* smallest diff */
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unsigned long udiv; /* best udiv */
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unsigned short idiff; /* current diff */
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unsigned short ibdiv; /* current bdiv */
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unsigned long est; /* current estimate */
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unsigned long baud;
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void *np;
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/* read the sysclk value from the CPLD */
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sysclk = (in_8((unsigned char *)0x80000000) == 0xc) ? 66666666 : 33333000;
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/*
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* Read PLL Mode registers
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*/
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cpr_plld = CPR0_READ(DCRN_CPR0_PLLD);
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cpr_pllc = CPR0_READ(DCRN_CPR0_PLLC);
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/*
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* Determine forward divider A
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*/
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pllFwdDiv = ((cpr_plld & PLLD_FWDVA_MASK) >> 16);
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/*
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* Determine forward divider B
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*/
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pllFwdDivB = ((cpr_plld & PLLD_FWDVB_MASK) >> 8);
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if (pllFwdDivB == 0)
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pllFwdDivB = 8;
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/*
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* Determine FBK_DIV.
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*/
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pllFbkDiv = ((cpr_plld & PLLD_FBDV_MASK) >> 24);
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if (pllFbkDiv == 0)
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pllFbkDiv = 256;
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/*
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* Read CPR_PRIMAD register
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*/
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cpr_primad = CPR0_READ(DCRN_CPR0_PRIMAD);
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/*
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* Determine PLB_DIV.
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*/
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pllPlbDiv = ((cpr_primad & PRIMAD_PLBDV_MASK) >> 16);
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if (pllPlbDiv == 0)
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pllPlbDiv = 16;
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/*
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* Determine EXTBUS_DIV.
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*/
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pllExtBusDiv = (cpr_primad & PRIMAD_EBCDV_MASK);
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if (pllExtBusDiv == 0)
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pllExtBusDiv = 16;
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/*
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* Determine OPB_DIV.
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*/
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pllOpbDiv = ((cpr_primad & PRIMAD_OPBDV_MASK) >> 8);
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if (pllOpbDiv == 0)
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pllOpbDiv = 16;
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/* There is a bug in U-Boot that prevents us from using
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* bd.bi_opbfreq because U-Boot doesn't populate it for
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* 405EZ. We get to calculate it, yay!
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*/
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freqOPB = (sysclk *pllFbkDiv) /pllOpbDiv;
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freqEBC = (sysclk * pllFbkDiv) / pllExtBusDiv;
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plloutb = ((sysclk * ((cpr_pllc & PLLC_SRC_MASK) ?
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pllFwdDivB : pllFwdDiv) *
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pllFbkDiv) / pllFwdDivB);
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np = find_node_by_alias("serial0");
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if (getprop(np, "current-speed", &baud, sizeof(baud)) != sizeof(baud))
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fatal("no current-speed property\n\r");
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udiv = 256; /* Assume lowest possible serial clk */
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div = plloutb / (16 * baud); /* total divisor */
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umin = (plloutb / freqOPB) << 1; /* 2 x OPB divisor */
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diff = 256; /* highest possible */
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/* i is the test udiv value -- start with the largest
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* possible (256) to minimize serial clock and constrain
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* search to umin.
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*/
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for (i = 256; i > umin; i--) {
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ibdiv = div / i;
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est = i * ibdiv;
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idiff = (est > div) ? (est-div) : (div-est);
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if (idiff == 0) {
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udiv = i;
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break; /* can't do better */
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} else if (idiff < diff) {
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udiv = i; /* best so far */
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diff = idiff; /* update lowest diff*/
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}
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}
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freqUART = plloutb / udiv;
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dt_fixup_cpu_clocks(bd.bi_procfreq, bd.bi_intfreq, bd.bi_plb_busfreq);
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dt_fixup_clock("/plb/ebc", freqEBC);
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dt_fixup_clock("/plb/opb", freqOPB);
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dt_fixup_clock("/plb/opb/serial@ef600300", freqUART);
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dt_fixup_clock("/plb/opb/serial@ef600400", freqUART);
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}
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static void acadia_fixups(void)
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{
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dt_fixup_memory(bd.bi_memstart, bd.bi_memsize);
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get_clocks();
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dt_fixup_mac_address_by_alias("ethernet0", bd.bi_enetaddr);
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}
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void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
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unsigned long r6, unsigned long r7)
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{
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CUBOOT_INIT();
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platform_ops.fixups = acadia_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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