Unable to Read PPC440EPx Board ID thru Board Control and Status Registers (BCSR)

[Josh Boyer]

On Tue, 27 Nov 2007 02:47:45 -0800 (PST)
Dell Query <dell.query at yahoo.com> wrote:

> Hi,
> 
> I am creating a simple program which will try to read the board ID of the PPC440EPx thru BCSR but when I load it, it gives me "Data Read PLB Error". 
> 
> I am not sure if I missed out something.
> 
> I would really appreciate it if somebody could help me on this.
> 
> I have posted the source code below, as well as the complete message.
> 
> Many thanks!
> 
> SOURCE CODE:
> ----------------------------------------------------------------------
> #include <linux/module.h>
> #include <linux/kernel.h>
> #include <linux/ioport.h>
> #include <linux/delay.h>
> #include <linux/init.h>
> #include <linux/interrupt.h>
> #include <linux/platform_device.h>
> #include <asm/irq.h>
> #include <asm/io.h>
> #include <linux/i2c.h>
> #include <linux/i2c-id.h>
> #include <asm/ocp.h>
> #include <asm/ibm4xx.h>
> 
> MODULE_LICENSE("GPL");
> 
> #define BCSR_BASE   0xC0002000

This is wrong.  It's 0x1C0002000.

> #define BCSR0       0
> #define BCSR1       1
> #define BCSR2       2
> 
> #define USER_LED    0x2
> #define SIZE_TO_MAP 10
> 
> #define LED_ON      0
> 
> uint __iomem *bcsrbase = NULL;
> 
> static int __init initFunction(void) {
>    uint tmp;
>    printk("<1> Calling init function.\n");
>    printk("<1> bcsrbase value %p...\n",bcsrbase);
>    printk("<1> Remapping %x...\n",BCSR_BASE);
>    /*map*/
>    bcsrbase = ioremap(BCSR_BASE, SIZE_TO_MAP);

Since this seems to be arch/ppc, use ioremap64.

josh