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powerpc/powernv: Add interfaces for flash device access

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This change adds the OPAL interface definitions to allow Linux to read,
write and erase from system flash devices. We register platform devices
for the flash devices exported by firmware.

We clash with the existing opal_flash_init function, which is really for
the FSP flash update functionality, so we rename that initcall to
opal_flash_update_init().

A future change will add an mtd driver that uses this interface.

Changes from Joel Stanley and Jeremy Kerr.

Signed-off-by: Cyril Bur <cyrilbur@gmail.com>
Signed-off-by: Jeremy Kerr <jk@ozlabs.org>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Acked-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Cyril Bur
2015-04-01 14:05:30 +08:00
committed by Michael Ellerman
parent d1d915783d
commit ed59190e41
5 changed files with 31 additions and 4 deletions
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16
arch/powerpc/platforms/powernv/opal.c
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@@ -693,6 +693,15 @@ static void __init opal_dump_region_init(void)
"rc = %d\n", rc);
}
static void opal_flash_init(struct device_node *opal_node)
{
struct device_node *np;
for_each_child_of_node(opal_node, np)
if (of_device_is_compatible(np, "ibm,opal-flash"))
of_platform_device_create(np, NULL, NULL);
}
static void opal_ipmi_init(struct device_node *opal_node)
{
struct device_node *np;
@@ -817,7 +826,7 @@ static int __init opal_init(void)
/* Setup error log interface */
rc = opal_elog_init();
/* Setup code update interface */
opal_flash_init();
opal_flash_update_init();
/* Setup platform dump extract interface */
opal_platform_dump_init();
/* Setup system parameters interface */
@@ -829,6 +838,8 @@ static int __init opal_init(void)
/* Initialize OPAL IPMI backend */
opal_ipmi_init(opal_node);
opal_flash_init(opal_node);
return 0;
}
machine_subsys_initcall(powernv, opal_init);
@@ -867,6 +878,9 @@ void opal_shutdown(void)
EXPORT_SYMBOL_GPL(opal_invalid_call);
EXPORT_SYMBOL_GPL(opal_ipmi_send);
EXPORT_SYMBOL_GPL(opal_ipmi_recv);
EXPORT_SYMBOL_GPL(opal_flash_read);
EXPORT_SYMBOL_GPL(opal_flash_write);
EXPORT_SYMBOL_GPL(opal_flash_erase);
/* Convert a region of vmalloc memory to an opal sg list */
struct opal_sg_list *opal_vmalloc_to_sg_list(void *vmalloc_addr,