add ax88772_rst

hc

2024-05-10 9999e48639b3cecb08ffb37358bcba3b48161b29

 kernel/arch/arm/mach-imx/cpu-imx27.c
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@@ -1,20 +1,7 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * Copyright 2007 Freescale Semiconductor, Inc. All Rights Reserved.
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  * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public License
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- * as published by the Free Software Foundation; either version 2
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- * of the License, or (at your option) any later version.
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- * GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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- * MA 02110-1301, USA.
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  */
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 /*
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@@ -22,6 +9,7 @@
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  */
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 #include <linux/io.h>
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+#include <linux/of_address.h>
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 #include <linux/module.h>
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 #include "hardware.h"
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@@ -30,16 +18,24 @@
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 static int mx27_cpu_partnumber;
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 #define SYS_CHIP_ID             0x00    /* The offset of CHIP ID register */
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+#define SYSCTRL_OFFSET		0x800	/* Offset from CCM base address */
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 static int mx27_read_cpu_rev(void)
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 {
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+	void __iomem *ccm_base;
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+	struct device_node *np;
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 	u32 val;
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+
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+	np = of_find_compatible_node(NULL, NULL, "fsl,imx27-ccm");
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+	ccm_base = of_iomap(np, 0);
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+	of_node_put(np);
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+	BUG_ON(!ccm_base);
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 	/*
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 	 * now we have access to the IO registers. As we need
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 	 * the silicon revision very early we read it here to
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 	 * avoid any further hooks
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 	*/
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-	val = imx_readl(MX27_IO_ADDRESS(MX27_SYSCTRL_BASE_ADDR + SYS_CHIP_ID));
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+	val = imx_readl(ccm_base + SYSCTRL_OFFSET + SYS_CHIP_ID);
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 	mx27_cpu_partnumber = (int)((val >> 12) & 0xFFFF);
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