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Date: Sun, 10 Oct 2010 22:10:36 -0600
From: Grant Likely <grant.likely@...retlab.ca>
To: Andres Salomon <dilinger@...ued.net>
Cc: devicetree-discuss@...ts.ozlabs.org,
David Miller <davem@...emloft.net>, sparclinux@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/7] of: no longer call prom_ functions directly; use
an ops structure
On Sun, Oct 10, 2010 at 01:46:41AM -0700, Andres Salomon wrote:
>
> Rather than assuming an architecture defines prom_getchild and friends,
> define an ops struct with hooks for the various prom functions that
> pdt.c needs. This ops struct is filled in by the
> arch-(and sometimes firmware-)specific code, and passed to
> of_pdt_build_devicetree.
>
> Update sparc code to define the ops struct as well.
>
> Signed-off-by: Andres Salomon <dilinger@...ued.net>
Applied, thanks.
g.
> ---
> arch/sparc/kernel/prom_common.c | 36 ++++++++++++++++++++++++++++++++++-
> drivers/of/pdt.c | 40 +++++++++++++++++---------------------
> include/linux/of_pdt.h | 20 ++++++++++++++++++-
> 3 files changed, 72 insertions(+), 24 deletions(-)
>
> diff --git a/arch/sparc/kernel/prom_common.c b/arch/sparc/kernel/prom_common.c
> index fe84d56..ed25834 100644
> --- a/arch/sparc/kernel/prom_common.c
> +++ b/arch/sparc/kernel/prom_common.c
> @@ -118,11 +118,45 @@ int of_find_in_proplist(const char *list, const char *match, int len)
> }
> EXPORT_SYMBOL(of_find_in_proplist);
>
> +/*
> + * SPARC32 and SPARC64's prom_nextprop() do things differently
> + * here, despite sharing the same interface. SPARC32 doesn't fill in 'buf',
> + * returning NULL on an error. SPARC64 fills in 'buf', but sets it to an
> + * empty string upon error.
> + */
> +static int __init handle_nextprop_quirks(char *buf, const char *name)
> +{
> + if (!name || strlen(name) == 0)
> + return -1;
> +
> +#ifdef CONFIG_SPARC32
> + strcpy(buf, name);
> +#endif
> + return 0;
> +}
> +
> +static int __init prom_common_nextprop(phandle node, char *prev, char *buf)
> +{
> + const char *name;
> +
> + buf[0] = '\0';
> + name = prom_nextprop(node, prev, buf);
> + return handle_nextprop_quirks(buf, name);
> +}
> +
> unsigned int prom_early_allocated __initdata;
>
> +static struct of_pdt_ops prom_sparc_ops __initdata = {
> + .nextprop = prom_common_nextprop,
> + .getproplen = prom_getproplen,
> + .getproperty = prom_getproperty,
> + .getchild = prom_getchild,
> + .getsibling = prom_getsibling,
> +};
> +
> void __init prom_build_devicetree(void)
> {
> - of_pdt_build_devicetree(prom_root_node);
> + of_pdt_build_devicetree(prom_root_node, &prom_sparc_ops);
> of_console_init();
>
> pr_info("PROM: Built device tree with %u bytes of memory.\n",
> diff --git a/drivers/of/pdt.c b/drivers/of/pdt.c
> index 2fdb1b4..fd02fc1 100644
> --- a/drivers/of/pdt.c
> +++ b/drivers/of/pdt.c
> @@ -23,7 +23,8 @@
> #include <linux/of.h>
> #include <linux/of_pdt.h>
> #include <asm/prom.h>
> -#include <asm/oplib.h>
> +
> +static struct of_pdt_ops *of_pdt_prom_ops __initdata;
>
> void __initdata (*prom_build_more)(struct device_node *dp,
> struct device_node ***nextp);
> @@ -59,7 +60,7 @@ static struct property * __init build_one_prop(phandle node, char *prev,
> {
> static struct property *tmp = NULL;
> struct property *p;
> - const char *name;
> + int err;
>
> if (tmp) {
> p = tmp;
> @@ -77,28 +78,20 @@ static struct property * __init build_one_prop(phandle node, char *prev,
> p->value = prom_early_alloc(special_len);
> memcpy(p->value, special_val, special_len);
> } else {
> - if (prev == NULL) {
> - name = prom_firstprop(node, p->name);
> - } else {
> - name = prom_nextprop(node, prev, p->name);
> - }
> -
> - if (!name || strlen(name) == 0) {
> + err = of_pdt_prom_ops->nextprop(node, prev, p->name);
> + if (err) {
> tmp = p;
> return NULL;
> }
> -#ifdef CONFIG_SPARC32
> - strcpy(p->name, name);
> -#endif
> - p->length = prom_getproplen(node, p->name);
> + p->length = of_pdt_prom_ops->getproplen(node, p->name);
> if (p->length <= 0) {
> p->length = 0;
> } else {
> int len;
>
> p->value = prom_early_alloc(p->length + 1);
> - len = prom_getproperty(node, p->name, p->value,
> - p->length);
> + len = of_pdt_prom_ops->getproperty(node, p->name,
> + p->value, p->length);
> if (len <= 0)
> p->length = 0;
> ((unsigned char *)p->value)[p->length] = '\0';
> @@ -130,10 +123,10 @@ static char * __init get_one_property(phandle node, const char *name)
> char *buf = "<NULL>";
> int len;
>
> - len = prom_getproplen(node, name);
> + len = of_pdt_prom_ops->getproplen(node, name);
> if (len > 0) {
> buf = prom_early_alloc(len);
> - len = prom_getproperty(node, name, buf, len);
> + len = of_pdt_prom_ops->getproperty(node, name, buf, len);
> }
>
> return buf;
> @@ -211,21 +204,25 @@ static struct device_node * __init prom_build_tree(struct device_node *parent,
> #endif
> dp->full_name = build_full_name(dp);
>
> - dp->child = prom_build_tree(dp, prom_getchild(node), nextp);
> + dp->child = prom_build_tree(dp,
> + of_pdt_prom_ops->getchild(node), nextp);
>
> if (prom_build_more)
> prom_build_more(dp, nextp);
>
> - node = prom_getsibling(node);
> + node = of_pdt_prom_ops->getsibling(node);
> }
>
> return ret;
> }
>
> -void __init of_pdt_build_devicetree(phandle root_node)
> +void __init of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops)
> {
> struct device_node **nextp;
>
> + BUG_ON(!ops);
> + of_pdt_prom_ops = ops;
> +
> allnodes = prom_create_node(root_node, NULL);
> #if defined(CONFIG_SPARC)
> allnodes->path_component_name = "";
> @@ -234,6 +231,5 @@ void __init of_pdt_build_devicetree(phandle root_node)
>
> nextp = &allnodes->allnext;
> allnodes->child = prom_build_tree(allnodes,
> - prom_getchild(allnodes->phandle),
> - &nextp);
> + of_pdt_prom_ops->getchild(allnodes->phandle), &nextp);
> }
> diff --git a/include/linux/of_pdt.h b/include/linux/of_pdt.h
> index c0a8774..303c5ff 100644
> --- a/include/linux/of_pdt.h
> +++ b/include/linux/of_pdt.h
> @@ -13,10 +13,28 @@
> #ifndef _LINUX_OF_PDT_H
> #define _LINUX_OF_PDT_H
>
> +/* overridable operations for calling into the PROM */
> +struct of_pdt_ops {
> + /*
> + * buf should be 32 bytes; return 0 on success.
> + * If prev is NULL, the first property will be returned.
> + */
> + int (*nextprop)(phandle node, char *prev, char *buf);
> +
> + /* for both functions, return proplen on success; -1 on error */
> + int (*getproplen)(phandle node, const char *prop);
> + int (*getproperty)(phandle node, const char *prop, char *buf,
> + int bufsize);
> +
> + /* phandles are 0 if no child or sibling exists */
> + phandle (*getchild)(phandle parent);
> + phandle (*getsibling)(phandle node);
> +};
> +
> extern void *prom_early_alloc(unsigned long size);
>
> /* for building the device tree */
> -extern void of_pdt_build_devicetree(phandle root_node);
> +extern void of_pdt_build_devicetree(phandle root_node, struct of_pdt_ops *ops);
>
> extern void (*prom_build_more)(struct device_node *dp,
> struct device_node ***nextp);
> --
> 1.5.6.5
>
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