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Date: Thu, 14 Jun 2012 13:47:26 -0400
From: Josh Boyer <jwboyer@...il.com>
To: Vinh Nguyen Huu Tuong <vhtnguyen@....com>
Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Matt Porter <mporter@...nel.crashing.org>,
Grant Likely <grant.likely@...retlab.ca>,
Rob Herring <rob.herring@...xeda.com>,
Duc Dang <dhdang@....com>,
"David S. Miller" <davem@...emloft.net>,
Kumar Gala <galak@...nel.crashing.org>,
Li Yang <leoli@...escale.com>,
Ashish Kalra <ashish.kalra@...escale.com>,
Anatolij Gustschin <agust@...x.de>,
Liu Gang <Gang.Liu@...escale.com>,
linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
devicetree-discuss@...ts.ozlabs.org
Subject: Re: [PATCH] powerpc/44x: Support OCM(On Chip Memory) for APM821xx SoC
and Bluestone board
On Sun, May 6, 2012 at 11:52 PM, Vinh Nguyen Huu Tuong
<vhtnguyen@....com> wrote:
> This patch consists of:
> - Add driver for OCM component
> - Export OCM Information at /sys/class/ocm/ocminfo
Again, apologies for the delay. Aside from the incorrect sysfs usage
I pointed out in my other reply, I have just a few comments/questions
below.
> diff --git a/arch/powerpc/boot/dts/bluestone.dts b/arch/powerpc/boot/dts/bluestone.dts
> index 7bda373..2687c11 100644
> --- a/arch/powerpc/boot/dts/bluestone.dts
> +++ b/arch/powerpc/boot/dts/bluestone.dts
> @@ -107,6 +107,14 @@
> interrupt-parent = <&UIC0>;
> };
>
> + OCM1: ocm@...040000 {
> + compatible = "ibm,ocm";
> + status = "ok";
> + cell-index = <1>;
> + /* configured in U-Boot */
> + reg = <4 0x00040000 0x8000>; /* 32K */
> + };
> +
> SDR0: sdr {
> compatible = "ibm,sdr-apm821xx";
> dcr-reg = <0x00e 0x002>;
> diff --git a/arch/powerpc/include/asm/ppc4xx_ocm.h b/arch/powerpc/include/asm/ppc4xx_ocm.h
> new file mode 100644
> index 0000000..ff7f386
> --- /dev/null
> +++ b/arch/powerpc/include/asm/ppc4xx_ocm.h
> @@ -0,0 +1,47 @@
> +/*
> + * PowerPC 4xx OCM memory allocation support
> + *
> + * (C) Copyright 2009, Applied Micro Circuits Corporation
> + * Victor Gallardo (vgallardo@...c.com)
> + *
> + * See file CREDITS for list of people who contributed to this
> + * project.
> + *
> + * 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.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, write to the Free Software
> + * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
> + * MA 02111-1307 USA
> + */
> +
> +#ifndef __ASM_POWERPC_PPC4xx_OCM_H__
> +#define __ASM_POWERPC_PPC4xx_OCM_H__
> +
> +#include <linux/types.h>
> +
> +#define OCM_NON_CACHED 0
> +#define OCM_CACHED 1
> +
> +#if defined(CONFIG_PPC4xx_OCM)
> +
> +void *ocm_alloc(phys_addr_t *phys, int size, int align,
> + int flags, const char *owner);
> +void ocm_free(const void *virt);
> +
> +#else
> +
> +#define ocm_alloc(phys, size, align, flags, owner) NULL
> +#define ocm_free(addr) ((void)0)
> +
> +#endif /* CONFIG_PPC4xx_OCM */
> +
> +#endif /* __ASM_POWERPC_PPC4xx_OCM_H__ */
I don't see any users of this header included in the patch. I'm going
to guess that follow-on drivers/users are queued once this is in the
tree? Also, you might want to name these 'ppc4xx_ocm_alloc' or
similar. The concept of OCM isn't limited to ppc4xx or even SoCs, so
just using 'ocm' in the global kernel namespace might not be great.
> diff --git a/arch/powerpc/sysdev/ppc4xx_ocm.c b/arch/powerpc/sysdev/ppc4xx_ocm.c
> new file mode 100644
> index 0000000..ba3e450
> --- /dev/null
> +++ b/arch/powerpc/sysdev/ppc4xx_ocm.c
> @@ -0,0 +1,420 @@
> +#include <linux/kernel.h>
> +#include <linux/errno.h>
> +#include <linux/proc_fs.h>
Why do you need proc_fs.h?
> +#include <linux/seq_file.h>
> +#include <linux/spinlock.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/list.h>
> +#include <asm/uaccess.h>
> +#include <asm/prom.h>
> +#include <asm/dcr.h>
> +#include <asm/rheap.h>
> +#include <asm/mmu.h>
> +#include <asm/ppc4xx_ocm.h>
> +#include <linux/export.h>
> +
> +#define OCM_DISABLED 0
> +#define OCM_ENABLED 1
> +
> +struct ocm_block {
> + struct list_head list;
> + void __iomem *addr;
> + int size;
> + const char *owner;
> +};
> +
> +/* non-cached or cached region */
> +struct ocm_region {
> + phys_addr_t phys;
> + void __iomem *virt;
> +
> + int memtotal;
> + int memfree;
> +
> + rh_info_t *rh;
> + struct list_head list;
> +};
There's some interesting whitespace usage in these struct definitions.
josh
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