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ARM: imx27: Retrieve the SYSCTRL base address from devicetree

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Now that imx27 has been converted to a devicetree-only platform,
retrieve the SYSCTRL base address from devicetree.

To keep devicetree compatibilty the SYSCTRL base address will be
retrieved from the CCM base address plus an 0x800 offset.

This is not a problem as the imx27.dtsi describes the CCM register
range as 0x1000.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Fabio Estevam 2020-09-16 21:41:15 -03:00 committed by Shawn Guo
parent f92c710f46
commit 94b2bec1b0
1 changed files with 9 additions and 1 deletions
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10
arch/arm/mach-imx/cpu-imx27.c
View file

@ -9,6 +9,7 @@
*/
#include <linux/io.h>
#include <linux/of_address.h>
#include <linux/module.h>
#include "hardware.h"
@ -17,16 +18,23 @@ static int mx27_cpu_rev = -1;
static int mx27_cpu_partnumber;
#define SYS_CHIP_ID 0x00 /* The offset of CHIP ID register */
#define SYSCTRL_OFFSET 0x800 /* Offset from CCM base address */
static int mx27_read_cpu_rev(void)
{
void __iomem *ccm_base;
struct device_node *np;
u32 val;
np = of_find_compatible_node(NULL, NULL, "fsl,imx27-ccm");
ccm_base = of_iomap(np, 0);
BUG_ON(!ccm_base);
/*
* now we have access to the IO registers. As we need
* the silicon revision very early we read it here to
* avoid any further hooks
*/
val = imx_readl(MX27_IO_ADDRESS(MX27_SYSCTRL_BASE_ADDR + SYS_CHIP_ID));
val = imx_readl(ccm_base + SYSCTRL_OFFSET + SYS_CHIP_ID);
mx27_cpu_partnumber = (int)((val >> 12) & 0xFFFF);