From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sascha Hauer Subject: Re: [PATCH v5 08/10] ARM: mxs: add ocotp read function Date: Fri, 14 Jan 2011 09:40:09 +0100 Message-ID: <20110114084009.GL26617@pengutronix.de> References: <1294297998-26930-1-git-send-email-shawn.guo@freescale.com> <1294989894-20780-1-git-send-email-shawn.guo@freescale.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: davem@davemloft.net, gerg@snapgear.com, baruch@tkos.co.il, eric@eukrea.com, bryan.wu@canonical.com, r64343@freescale.com, B32542@freescale.com, lw@karo-electronics.de, w.sang@pengutronix.de, jamie@jamieiles.com, jamie@shareable.org, netdev@vger.kernel.org, linux-arm-kernel@lists.infradead.org To: Shawn Guo Return-path: Received: from metis.ext.pengutronix.de ([92.198.50.35]:42283 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753764Ab1ANIkZ (ORCPT ); Fri, 14 Jan 2011 03:40:25 -0500 Content-Disposition: inline In-Reply-To: <1294989894-20780-1-git-send-email-shawn.guo@freescale.com> Sender: netdev-owner@vger.kernel.org List-ID: On Fri, Jan 14, 2011 at 03:24:54PM +0800, Shawn Guo wrote: > Signed-off-by: Shawn Guo > --- > arch/arm/mach-mxs/Kconfig | 4 ++ > arch/arm/mach-mxs/Makefile | 3 + > arch/arm/mach-mxs/include/mach/common.h | 1 + > arch/arm/mach-mxs/ocotp.c | 90 +++++++++++++++++++++++++++++++ > 4 files changed, 98 insertions(+), 0 deletions(-) > create mode 100644 arch/arm/mach-mxs/ocotp.c > > diff --git a/arch/arm/mach-mxs/Kconfig b/arch/arm/mach-mxs/Kconfig > index 8bfc8df..cd2fbdf 100644 > --- a/arch/arm/mach-mxs/Kconfig > +++ b/arch/arm/mach-mxs/Kconfig > @@ -2,6 +2,9 @@ if ARCH_MXS > > source "arch/arm/mach-mxs/devices/Kconfig" > > +config MXS_OCOTP > + bool > + > config SOC_IMX23 > bool > select CPU_ARM926T > @@ -26,6 +29,7 @@ config MACH_MX28EVK > select SOC_IMX28 > select MXS_HAVE_AMBA_DUART > select MXS_HAVE_PLATFORM_FEC > + select MXS_OCOTP > default y > help > Include support for MX28EVK platform. This includes specific > diff --git a/arch/arm/mach-mxs/Makefile b/arch/arm/mach-mxs/Makefile > index 39d3f9c..623899b 100644 > --- a/arch/arm/mach-mxs/Makefile > +++ b/arch/arm/mach-mxs/Makefile > @@ -1,6 +1,9 @@ > # Common support > obj-y := clock.o devices.o gpio.o icoll.o iomux.o system.o timer.o > > +obj-$(CONFIG_PM) += pm.o > +obj-$(CONFIG_MXS_OCOTP) += ocotp.o > + > obj-$(CONFIG_SOC_IMX23) += clock-mx23.o mm-mx23.o > obj-$(CONFIG_SOC_IMX28) += clock-mx28.o mm-mx28.o > > diff --git a/arch/arm/mach-mxs/include/mach/common.h b/arch/arm/mach-mxs/include/mach/common.h > index 59133eb..635bb5d 100644 > --- a/arch/arm/mach-mxs/include/mach/common.h > +++ b/arch/arm/mach-mxs/include/mach/common.h > @@ -13,6 +13,7 @@ > > struct clk; > > +extern const u32 *mxs_get_ocotp(void); > extern int mxs_reset_block(void __iomem *); > extern void mxs_timer_init(struct clk *, int); > > diff --git a/arch/arm/mach-mxs/ocotp.c b/arch/arm/mach-mxs/ocotp.c > new file mode 100644 > index 0000000..eb2eab7 > --- /dev/null > +++ b/arch/arm/mach-mxs/ocotp.c > @@ -0,0 +1,90 @@ > +/* > + * Copyright 2010 Freescale Semiconductor, Inc. All Rights Reserved. > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License as published by > + * the Free Software Foundation; either version 2 of the License, or > + * (at your option) any later version. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + */ > + > +#include > +#include > +#include > + > +#include > + > +#define OCOTP_WORD_OFFSET 0x20 > +#define OCOTP_WORD_COUNT 0x20 > + > +#define BM_OCOTP_CTRL_BUSY (1 << 8) > +#define BM_OCOTP_CTRL_ERROR (1 << 9) > +#define BM_OCOTP_CTRL_RD_BANK_OPEN (1 << 12) > + > +static DEFINE_MUTEX(ocotp_mutex); > +static u32 ocotp_words[OCOTP_WORD_COUNT]; > + > +const u32 *mxs_get_ocotp(void) > +{ > + void __iomem *ocotp_base = MXS_IO_ADDRESS(MXS_OCOTP_BASE_ADDR); > + int timeout = 0x400; > + size_t i; > + static int once = 0; > + > + if (once) > + return ocotp_words; > + > + mutex_lock(&ocotp_mutex); > + > + /* > + * clk_enable(hbus_clk) for ocotp can be skipped > + * as it must be on when system is running. > + */ > + > + /* try to clear ERROR bit */ > + __mxs_clrl(BM_OCOTP_CTRL_ERROR, ocotp_base); > + > + /* check both BUSY and ERROR cleared */ > + while ((__raw_readl(ocotp_base) & > + (BM_OCOTP_CTRL_BUSY | BM_OCOTP_CTRL_ERROR)) && --timeout) > + cpu_relax(); > + > + if (unlikely(!timeout)) > + goto error_unlock; > + > + /* open OCOTP banks for read */ > + __mxs_setl(BM_OCOTP_CTRL_RD_BANK_OPEN, ocotp_base); > + > + /* approximately wait 32 hclk cycles */ > + udelay(1); > + > + /* poll BUSY bit becoming cleared */ > + timeout = 0x400; > + while ((__raw_readl(ocotp_base) & BM_OCOTP_CTRL_BUSY) && --timeout) > + cpu_relax(); > + > + if (unlikely(!timeout)) > + goto error_unlock; > + > + for (i = 0; i < OCOTP_WORD_COUNT; i++) > + ocotp_words[i] = __raw_readl(ocotp_base + OCOTP_WORD_OFFSET + > + i * 0x10); > + > + /* close banks for power saving */ > + __mxs_clrl(BM_OCOTP_CTRL_RD_BANK_OPEN, ocotp_base); > + > + mutex_unlock(&ocotp_mutex); > + > + once = 1; > + > + return ocotp_words; > + > +error_unlock: > + mutex_unlock(&ocotp_mutex); > + pr_err("%s: timeout in reading OCOTP\n", __func__); > + return NULL; > +} EXPORT_SYMBOL? 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