[1/4] powerpc/85xx: Add a head file for cpu type detection

[Scott Wood]

On Mon, Mar 05, 2012 at 11:10:53PM -0000, chenhui zhao wrote:
> From: chenhui zhao <chenhui.zhao at freescale.com>
> 
> The workarounds need to detect the cpu type. Add these macros
> and inline routines to help cpu type detection in runtime.
> 
> Signed-off-by: Zhao Chenhui <chenhui.zhao at freescale.com>
> Signed-off-by: Li Yang <leoli at freescale.com>
> 
> ---
> arch/powerpc/include/asm/mpc85xx.h |   72 ++++++++++++++++++++++++++++++++++++
>  1 files changed, 72 insertions(+), 0 deletions(-)
>  create mode 100644 arch/powerpc/include/asm/mpc85xx.h
> 
> diff --git a/arch/powerpc/include/asm/mpc85xx.h b/arch/powerpc/include/asm/mpc85xx.h
> new file mode 100644
> index 0000000..451777c
> --- /dev/null
> +++ b/arch/powerpc/include/asm/mpc85xx.h
> @@ -0,0 +1,72 @@
> +/*
> + * MPC85xx cpu type detection
> + *
> + * Copyright 2011-2012 Freescale Semiconductor, Inc.
> + *
> + * This 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.
> + */
> +
> +#ifndef __ASM_PPC_CPU_H
> +#define __ASM_PPC_CPU_H

s/CPU/MPC85xx/

> +#define SVR_REV(svr)	((svr) & 0xFF)		/* SOC design resision */

Please update U-Boot's definition, so that shared code doesn't run into
problems.

> +#define SVR_MAJ(svr)	(((svr) >>  4) & 0xF)	/* Major revision field*/
> +#define SVR_MIN(svr)	(((svr) >>  0) & 0xF)	/* Minor revision field*/
> +
> +/* Some parts define SVR[0:23] as the SOC version */
> +#define SVR_SOC_VER(svr) (((svr) >> 8) & 0xFFFFFF)	/* SOC Version fields */
> +
> +#define IS_SVR_REV(svr, maj, min) \
> +	((SVR_MAJ(svr) == (maj)) && (SVR_MIN(svr) == (min)))
> +
> +#define SVR_8533	0x803400
> +#define SVR_8533_E	0x803C00
> +#define SVR_8535	0x803701
> +#define SVR_8535_E	0x803F01
> +#define SVR_8536	0x803700
> +#define SVR_8536_E	0x803F00
> +#define SVR_8540	0x803000
> +#define SVR_8541	0x807200
> +#define SVR_8541_E	0x807A00
> +#define SVR_8543	0x803200
> +#define SVR_8543_E	0x803A00

Can we separate out E as an orthogonal bit, as we now do in U-Boot?

> +#define SVR_8544	0x803401
> +#define SVR_8544_E	0x803C01
> +#define SVR_8545	0x803102
> +#define SVR_8545_E	0x803902
> +#define SVR_8547_E	0x803901
> +#define SVR_8548	0x803100
> +#define SVR_8548_E	0x803900
> +#define SVR_8555	0x807100
> +#define SVR_8555_E	0x807900
> +#define SVR_8560	0x807000
> +#define SVR_8567	0x807501
> +#define SVR_8567_E	0x807D01
> +#define SVR_8568	0x807500
> +#define SVR_8568_E	0x807D00
> +#define SVR_8569	0x808000
> +#define SVR_8569_E	0x808800
> +#define SVR_8572	0x80E000
> +#define SVR_8572_E	0x80E800
> +
> +
> +static inline int fsl_svr_is(u32 svr)
> +{
> +	u32 id = SVR_SOC_VER(mfspr(SPRN_SVR));
> +
> +	return (id == svr);
> +}

fsl_svr_is() and IS_SVR_REV() are confusingly similar, and the
upper/lower difference and word-order difference is jarring.  I'm not
sure why you even need fsl_svr_is.  This file is obviously patterned
after U-Boot code, but U-Boot doesn't have this.  Why can't the caller do
the equality check?

> +/* Return true if current SOC revision is prior to (maj, min)  */
> +static inline int fsl_svr_older_than(u8 maj, u8 min)
> +{
> +	u32 rev = SVR_REV(mfspr(SPRN_SVR));
> +	u32 cmp = (maj << 4) | min;
> +
> +	return (rev < cmp);
> +}

Is this that much easier than the caller doing:

	if (SVR_REV(svr) < 0x20)

?

-Scott