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Message-ID: <1295017883-28775-1-git-send-email-shawn.guo@freescale.com>
Date: Fri, 14 Jan 2011 23:11:23 +0800
From: Shawn Guo <shawn.guo@...escale.com>
To: <davem@...emloft.net>, <gerg@...pgear.com>, <baruch@...s.co.il>,
<eric@...rea.com>, <bryan.wu@...onical.com>,
<r64343@...escale.com>, <B32542@...escale.com>,
<u.kleine-koenig@...gutronix.de>, <lw@...o-electronics.de>,
<w.sang@...gutronix.de>, <s.hauer@...gutronix.de>,
<jamie@...ieiles.com>, <jamie@...reable.org>,
<netdev@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>
CC: Shawn Guo <shawn.guo@...escale.com>
Subject: [PATCH v6 08/10] ARM: mxs: add ocotp read function
Signed-off-by: Shawn Guo <shawn.guo@...escale.com>
---
arch/arm/mach-mxs/Kconfig | 4 ++
arch/arm/mach-mxs/Makefile | 2 +
arch/arm/mach-mxs/include/mach/common.h | 1 +
arch/arm/mach-mxs/ocotp.c | 90 +++++++++++++++++++++++++++++++
4 files changed, 97 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..df501a8 100644
--- a/arch/arm/mach-mxs/Makefile
+++ b/arch/arm/mach-mxs/Makefile
@@ -1,6 +1,8 @@
# Common support
obj-y := clock.o devices.o gpio.o icoll.o iomux.o system.o timer.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..65157a3
--- /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 <linux/delay.h>
+#include <linux/err.h>
+#include <linux/mutex.h>
+
+#include <mach/mxs.h>
+
+#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);
+
+ once = 1;
+
+ mutex_unlock(&ocotp_mutex);
+
+ return ocotp_words;
+
+error_unlock:
+ mutex_unlock(&ocotp_mutex);
+ pr_err("%s: timeout in reading OCOTP\n", __func__);
+ return NULL;
+}
--
1.7.1
--
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