powerpc/40x: Add cuboot wrapper for Acadia board (94c73a8f) · Commits · e / devices / android_kernel_fairphone_FP3

arch/powerpc/boot/Makefile

+3 −1

arch/powerpc/boot/cuboot-acadia.c

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			/*
			* Old U-boot compatibility for Acadia
			*
			* Author: Josh Boyer <jwboyer@linux.vnet.ibm.com>
			*
			* Copyright 2008 IBM Corporation
			*
			* 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 "io.h"
			#include "dcr.h"
			#include "stdio.h"
			#include "4xx.h"
			#include "44x.h"
			#include "cuboot.h"

			#define TARGET_4xx
			#include "ppcboot.h"

			static bd_t bd;

			#define CPR_PERD0_SPIDV_MASK 0x000F0000 /* SPI Clock Divider */

			#define PLLC_SRC_MASK 0x20000000 /* PLL feedback source */

			#define PLLD_FBDV_MASK 0x1F000000 /* PLL feedback divider value */
			#define PLLD_FWDVA_MASK 0x000F0000 /* PLL forward divider A value */
			#define PLLD_FWDVB_MASK 0x00000700 /* PLL forward divider B value */

			#define PRIMAD_CPUDV_MASK 0x0F000000 /* CPU Clock Divisor Mask */
			#define PRIMAD_PLBDV_MASK 0x000F0000 /* PLB Clock Divisor Mask */
			#define PRIMAD_OPBDV_MASK 0x00000F00 /* OPB Clock Divisor Mask */
			#define PRIMAD_EBCDV_MASK 0x0000000F /* EBC Clock Divisor Mask */

			#define PERD0_PWMDV_MASK 0xFF000000 /* PWM Divider Mask */
			#define PERD0_SPIDV_MASK 0x000F0000 /* SPI Divider Mask */
			#define PERD0_U0DV_MASK 0x0000FF00 /* UART 0 Divider Mask */
			#define PERD0_U1DV_MASK 0x000000FF /* UART 1 Divider Mask */

			static void get_clocks(void)
			{
			unsigned long sysclk, cpr_plld, cpr_pllc, cpr_primad, plloutb, i;
			unsigned long pllFwdDiv, pllFwdDivB, pllFbkDiv, pllPlbDiv, pllExtBusDiv;
			unsigned long pllOpbDiv, freqEBC, freqUART, freqOPB;
			unsigned long div; /* total divisor udiv * bdiv */
			unsigned long umin; /* minimum udiv */
			unsigned short diff; /* smallest diff */
			unsigned long udiv; /* best udiv */
			unsigned short idiff; /* current diff */
			unsigned short ibdiv; /* current bdiv */
			unsigned long est; /* current estimate */
			unsigned long baud;
			void *np;

			/* read the sysclk value from the CPLD */
			sysclk = (in_8((unsigned char *)0x80000000) == 0xc) ? 66666666 : 33333000;

			/*
			* Read PLL Mode registers
			*/
			cpr_plld = CPR0_READ(DCRN_CPR0_PLLD);
			cpr_pllc = CPR0_READ(DCRN_CPR0_PLLC);

			/*
			* Determine forward divider A
			*/
			pllFwdDiv = ((cpr_plld & PLLD_FWDVA_MASK) >> 16);

			/*
			* Determine forward divider B
			*/
			pllFwdDivB = ((cpr_plld & PLLD_FWDVB_MASK) >> 8);
			if (pllFwdDivB == 0)
			pllFwdDivB = 8;

			/*
			* Determine FBK_DIV.
			*/
			pllFbkDiv = ((cpr_plld & PLLD_FBDV_MASK) >> 24);
			if (pllFbkDiv == 0)
			pllFbkDiv = 256;

			/*
			* Read CPR_PRIMAD register
			*/
			cpr_primad = CPR0_READ(DCRN_CPR0_PRIMAD);

			/*
			* Determine PLB_DIV.
			*/
			pllPlbDiv = ((cpr_primad & PRIMAD_PLBDV_MASK) >> 16);
			if (pllPlbDiv == 0)
			pllPlbDiv = 16;

			/*
			* Determine EXTBUS_DIV.
			*/
			pllExtBusDiv = (cpr_primad & PRIMAD_EBCDV_MASK);
			if (pllExtBusDiv == 0)
			pllExtBusDiv = 16;

			/*
			* Determine OPB_DIV.
			*/
			pllOpbDiv = ((cpr_primad & PRIMAD_OPBDV_MASK) >> 8);
			if (pllOpbDiv == 0)
			pllOpbDiv = 16;

			/* There is a bug in U-Boot that prevents us from using
			* bd.bi_opbfreq because U-Boot doesn't populate it for
			* 405EZ. We get to calculate it, yay!
			*/
			freqOPB = (sysclk *pllFbkDiv) /pllOpbDiv;

			freqEBC = (sysclk * pllFbkDiv) / pllExtBusDiv;

			plloutb = ((sysclk * ((cpr_pllc & PLLC_SRC_MASK) ?
			pllFwdDivB : pllFwdDiv) *
			pllFbkDiv) / pllFwdDivB);

			np = find_node_by_alias("serial0");
			if (getprop(np, "current-speed", &baud, sizeof(baud)) != sizeof(baud))
			fatal("no current-speed property\n\r");

			udiv = 256; /* Assume lowest possible serial clk */
			div = plloutb / (16 * baud); /* total divisor */
			umin = (plloutb / freqOPB) << 1; /* 2 x OPB divisor */
			diff = 256; /* highest possible */

			/* i is the test udiv value -- start with the largest
			* possible (256) to minimize serial clock and constrain
			* search to umin.
			*/
			for (i = 256; i > umin; i--) {
			ibdiv = div / i;
			est = i * ibdiv;
			idiff = (est > div) ? (est-div) : (div-est);
			if (idiff == 0) {
			udiv = i;
			break; /* can't do better */
			} else if (idiff < diff) {
			udiv = i; /* best so far */
			diff = idiff; /* update lowest diff*/
			}
			}
			freqUART = plloutb / udiv;

			dt_fixup_cpu_clocks(bd.bi_procfreq, bd.bi_intfreq, bd.bi_plb_busfreq);
			dt_fixup_clock("/plb/ebc", freqEBC);
			dt_fixup_clock("/plb/opb", freqOPB);
			dt_fixup_clock("/plb/opb/serial@ef600300", freqUART);
			dt_fixup_clock("/plb/opb/serial@ef600400", freqUART);
			}

			static void acadia_fixups(void)
			{
			dt_fixup_memory(bd.bi_memstart, bd.bi_memsize);
			get_clocks();
			dt_fixup_mac_address_by_alias("ethernet0", bd.bi_enetaddr);
			}

			void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
			unsigned long r6, unsigned long r7)
			{
			CUBOOT_INIT();
			platform_ops.fixups = acadia_fixups;
			platform_ops.exit = ibm40x_dbcr_reset;
			fdt_init(_dtb_start);
			serial_console_init();
			}

Original line number	Original line	Diff line number	Diff line
	@@ -68,7 +68,8 @@ src-plat := of.c cuboot-52xx.c cuboot-824x.c cuboot-83xx.c cuboot-85xx.c holly.c
	fixed-head.S ep88xc.c ep405.c cuboot-c2k.c \		fixed-head.S ep88xc.c ep405.c cuboot-c2k.c \
	cuboot-katmai.c cuboot-rainier.c redboot-8xx.c ep8248e.c \		cuboot-katmai.c cuboot-rainier.c redboot-8xx.c ep8248e.c \
	cuboot-warp.c cuboot-85xx-cpm2.c cuboot-yosemite.c simpleboot.c \		cuboot-warp.c cuboot-85xx-cpm2.c cuboot-yosemite.c simpleboot.c \
	virtex405-head.S virtex.c redboot-83xx.c cuboot-sam440ep.c		virtex405-head.S virtex.c redboot-83xx.c cuboot-sam440ep.c \
			cuboot-acadia.c
	src-boot := $(src-wlib) $(src-plat) empty.c		src-boot := $(src-wlib) $(src-plat) empty.c

	src-boot := $(addprefix $(obj)/, $(src-boot))		src-boot := $(addprefix $(obj)/, $(src-boot))
	@@ -211,6 +212,7 @@ image-$(CONFIG_DEFAULT_UIMAGE) += uImage
	# Board ports in arch/powerpc/platform/40x/Kconfig		# Board ports in arch/powerpc/platform/40x/Kconfig
	image-$(CONFIG_EP405) += dtbImage.ep405		image-$(CONFIG_EP405) += dtbImage.ep405
	image-$(CONFIG_WALNUT) += treeImage.walnut		image-$(CONFIG_WALNUT) += treeImage.walnut
			image-$(CONFIG_ACADIA) += cuImage.acadia

	# Board ports in arch/powerpc/platform/44x/Kconfig		# Board ports in arch/powerpc/platform/44x/Kconfig
	image-$(CONFIG_EBONY) += treeImage.ebony cuImage.ebony		image-$(CONFIG_EBONY) += treeImage.ebony cuImage.ebony