From patchwork Thu Sep 4 01:01:39 2008 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Josh Boyer X-Patchwork-Id: 4305 X-Patchwork-Delegate: jwboyer@gmail.com Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from ozlabs.org (localhost [127.0.0.1]) by ozlabs.org (Postfix) with ESMTP id 35FABDF220 for ; Tue, 14 Oct 2008 05:13:14 +1100 (EST) X-Original-To: linuxppc-dev@ozlabs.org Delivered-To: linuxppc-dev@ozlabs.org Received: from wf-out-1314.google.com (wf-out-1314.google.com [209.85.200.171]) by ozlabs.org (Postfix) with ESMTP id 57FA3DE8DC for ; Tue, 14 Oct 2008 05:11:21 +1100 (EST) Received: by wf-out-1314.google.com with SMTP id 24so1812224wfg.15 for ; Mon, 13 Oct 2008 11:11:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:message-id:in-reply-to :references:from:date:subject:to:mime-version:x-mailer :content-transfer-encoding:sender; bh=dpcKRaM5u2gE6WFeomFYyCStSEMvrXjHr2kidmuGkxE=; b=S0EtBydaPnKBqFTvvIN3usIo9GuPw7QayInwwiPfGdpcdhg1lEbqzF/SroQHtq1Idq kTDxjRR0ALcgh4L8q8vkXrWmTC+S5ygp96CvZqNelXkNPH8+oNsPZLn690CkuQ+cf3iD Oqe8ET2tawQ5jNauJrqvp1EXbGM212riqx+fk= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:in-reply-to:references:from:date:subject:to:mime-version :x-mailer:content-transfer-encoding:sender; b=xjsNvS0LlbUwdR/rHmOQiB7U3o9uZbkJ1ZJoARZWoBZedTxPzhD8l4FOErSYz9HPvV ubk/oSiCYrTjp/OWJnteG17sNcsKvKrnyQ6mZys3u5WEbngEn1mycC+1gEMqSqjcIm0l efLeqWR2iCoi8jMd8i0puajvDwxWjGQb6GtxY= Received: by 10.141.29.18 with SMTP id g18mr4021244rvj.298.1223921479230; Mon, 13 Oct 2008 11:11:19 -0700 (PDT) Received: from ?192.168.1.101? (24-247-237-59.dhcp.aldl.mi.charter.com [24.247.237.59]) by mx.google.com with ESMTPS id 4sm13638607yxj.7.2008.10.13.11.11.17 (version=TLSv1/SSLv3 cipher=RC4-MD5); Mon, 13 Oct 2008 11:11:18 -0700 (PDT) Message-Id: <1c32c32bf9c0792949ba47e55dd50076dc3a8bd3.1223921238.git.jwboyer@linux.vnet.ibm.com> In-Reply-To: References: From: Josh Boyer Date: Wed, 3 Sep 2008 21:01:39 -0400 Subject: [PATCH 4/5] powerpc/40x: Add cuboot wrapper for Acadia board To: linuxppc-dev@ozlabs.org Mime-Version: 1.0 X-Mailer: Evolution 2.22.3.1 (2.22.3.1-1.fc9) X-BeenThere: linuxppc-dev@ozlabs.org X-Mailman-Version: 2.1.11 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@ozlabs.org Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@ozlabs.org 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 --- arch/powerpc/boot/Makefile | 4 +- arch/powerpc/boot/cuboot-acadia.c | 174 +++++++++++++++++++++++++++++++++++++ 2 files changed, 177 insertions(+), 1 deletions(-) create mode 100644 arch/powerpc/boot/cuboot-acadia.c diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile index 6403275..5f4a59c 100644 --- a/arch/powerpc/boot/Makefile +++ b/arch/powerpc/boot/Makefile @@ -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 \ cuboot-katmai.c cuboot-rainier.c redboot-8xx.c ep8248e.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 := $(addprefix $(obj)/, $(src-boot)) @@ -211,6 +212,7 @@ image-$(CONFIG_DEFAULT_UIMAGE) += uImage # Board ports in arch/powerpc/platform/40x/Kconfig image-$(CONFIG_EP405) += dtbImage.ep405 image-$(CONFIG_WALNUT) += treeImage.walnut +image-$(CONFIG_ACADIA) += cuImage.acadia # Board ports in arch/powerpc/platform/44x/Kconfig image-$(CONFIG_EBONY) += treeImage.ebony cuImage.ebony diff --git a/arch/powerpc/boot/cuboot-acadia.c b/arch/powerpc/boot/cuboot-acadia.c new file mode 100644 index 0000000..0634aba --- /dev/null +++ b/arch/powerpc/boot/cuboot-acadia.c @@ -0,0 +1,174 @@ +/* + * Old U-boot compatibility for Acadia + * + * Author: Josh Boyer + * + * 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(); +}