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Message-Id: <20140302054043.4F48AC414EF@trevor.secretlab.ca>
Date: Sun, 02 Mar 2014 13:40:43 +0800
From: Grant Likely <grant.likely@...aro.org>
To: Marek Szyprowski <m.szyprowski@...sung.com>,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linaro-mm-sig@...ts.linaro.org, devicetree@...r.kernel.org,
linux-doc@...r.kernel.org
Cc: Marek Szyprowski <m.szyprowski@...sung.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Arnd Bergmann <arnd@...db.de>,
Michal Nazarewicz <mina86@...a86.com>,
Tomasz Figa <t.figa@...sung.com>,
Sascha Hauer <s.hauer@...gutronix.de>,
Laura Abbott <lauraa@...eaurora.org>,
Rob Herring <robh+dt@...nel.org>,
Olof Johansson <olof@...om.net>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Stephen Warren <swarren@...dotorg.org>,
Ian Campbell <ian.campbell@...rix.com>,
Tomasz Figa <tomasz.figa@...il.com>,
Kumar Gala <galak@...eaurora.org>,
Nishanth Peethambaran <nishanth.p@...il.com>,
Marc <marc.ceeeee@...il.com>,
Josh Cartwright <joshc@...eaurora.org>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH v6 05/11] drivers: of: add automated assignment of reserved regions to client devices
On Fri, 28 Feb 2014 14:42:50 +0100, Marek Szyprowski <m.szyprowski@...sung.com> wrote:
> This patch adds code for automated assignment of reserved memory regions
> to struct device. reserved_mem->ops->device_init()/device_cleanup()
> callbacks are called to perform reserved memory driver specific
> initialization and cleanup
>
> Based on previous code provided by Josh Cartwright <joshc@...eaurora.org>
>
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
Hi Marek,
I've not applied this one yet, only because there is still the open
issue of whether or not these functions should be called from drivers or
from core code. I don't actually have any problems with the content of
this patch. Once the user is sorted out I'll merge it.
g.
> ---
> drivers/of/of_reserved_mem.c | 70 +++++++++++++++++++++++++++++++++++++++
> include/linux/of_reserved_mem.h | 7 ++++
> 2 files changed, 77 insertions(+)
>
> diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
> index daaaf935911d..5c45016efd31 100644
> --- a/drivers/of/of_reserved_mem.c
> +++ b/drivers/of/of_reserved_mem.c
> @@ -206,8 +206,16 @@ void __init fdt_init_reserved_mem(void)
> for (i = 0; i < reserved_mem_count; i++) {
> struct reserved_mem *rmem = &reserved_mem[i];
> unsigned long node = rmem->fdt_node;
> + unsigned long len;
> + __be32 *prop;
> int err = 0;
>
> + prop = of_get_flat_dt_prop(node, "phandle", &len);
> + if (!prop)
> + prop = of_get_flat_dt_prop(node, "linux,phandle", &len);
> + if (prop)
> + rmem->phandle = of_read_number(prop, len/4);
> +
> if (rmem->size == 0)
> err = __reserved_mem_alloc_size(node, rmem->name,
> &rmem->base, &rmem->size);
> @@ -215,3 +223,65 @@ void __init fdt_init_reserved_mem(void)
> __reserved_mem_init_node(rmem);
> }
> }
> +
> +static inline struct reserved_mem *__find_rmem(struct device_node *node)
> +{
> + unsigned int i;
> +
> + if (!node->phandle)
> + return NULL;
> +
> + for (i = 0; i < reserved_mem_count; i++)
> + if (reserved_mem[i].phandle == node->phandle)
> + return &reserved_mem[i];
> + return NULL;
> +}
> +
> +/**
> + * of_reserved_mem_device_init() - assign reserved memory region to given device
> + *
> + * This function assign memory region pointed by "memory-region" device tree
> + * property to the given device.
> + */
> +void of_reserved_mem_device_init(struct device *dev)
> +{
> + struct reserved_mem *rmem;
> + struct device_node *np;
> +
> + np = of_parse_phandle(dev->of_node, "memory-region", 0);
> + if (!np)
> + return;
> +
> + rmem = __find_rmem(np);
> + of_node_put(np);
> +
> + if (!rmem || !rmem->ops || !rmem->ops->device_init)
> + return;
> +
> + rmem->ops->device_init(rmem, dev);
> + dev_info(dev, "assigned reserved memory node %s\n", rmem->name);
> +}
> +
> +/**
> + * of_reserved_mem_device_release() - release reserved memory device structures
> + *
> + * This function releases structures allocated for memory region handling for
> + * the given device.
> + */
> +void of_reserved_mem_device_release(struct device *dev)
> +{
> + struct reserved_mem *rmem;
> + struct device_node *np;
> +
> + np = of_parse_phandle(dev->of_node, "memory-region", 0);
> + if (!np)
> + return;
> +
> + rmem = __find_rmem(np);
> + of_node_put(np);
> +
> + if (!rmem || !rmem->ops || !rmem->ops->device_release)
> + return;
> +
> + rmem->ops->device_release(rmem, dev);
> +}
> diff --git a/include/linux/of_reserved_mem.h b/include/linux/of_reserved_mem.h
> index 9b1fbb7f29fc..6a54e6565b89 100644
> --- a/include/linux/of_reserved_mem.h
> +++ b/include/linux/of_reserved_mem.h
> @@ -8,6 +8,7 @@ struct reserved_mem_ops;
> struct reserved_mem {
> const char *name;
> unsigned long fdt_node;
> + unsigned long phandle;
> const struct reserved_mem_ops *ops;
> phys_addr_t base;
> phys_addr_t size;
> @@ -25,6 +26,9 @@ typedef int (*reservedmem_of_init_fn)(struct reserved_mem *rmem,
> unsigned long node, const char *uname);
>
> #ifdef CONFIG_OF_RESERVED_MEM
> +void of_reserved_mem_device_init(struct device *dev);
> +void of_reserved_mem_device_release(struct device *dev);
> +
> void fdt_init_reserved_mem(void);
> void fdt_reserved_mem_save_node(unsigned long node, const char *uname,
> phys_addr_t base, phys_addr_t size);
> @@ -37,6 +41,9 @@ void fdt_reserved_mem_save_node(unsigned long node, const char *uname,
> init : init }
>
> #else
> +static inline void of_reserved_mem_device_init(struct device *dev) { }
> +static inline void of_reserved_mem_device_release(struct device *pdev) { }
> +
> static inline void fdt_init_reserved_mem(void) { }
> static inline void fdt_reserved_mem_save_node(unsigned long node,
> const char *uname, phys_addr_t base, phys_addr_t size) { }
> --
> 1.7.9.5
>
--
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