diff options
Diffstat (limited to 'drivers/of/reserved-mem.c')
| -rw-r--r-- | drivers/of/reserved-mem.c | 38 |
1 files changed, 27 insertions, 11 deletions
diff --git a/drivers/of/reserved-mem.c b/drivers/of/reserved-mem.c index 34e61dfea3..599a7c968a 100644 --- a/drivers/of/reserved-mem.c +++ b/drivers/of/reserved-mem.c @@ -1,19 +1,38 @@ // SPDX-License-Identifier: GPL-2.0-only // SPDX-FileCopyrightText: 2021 Rouven Czerwinski <r.czerwinski@pengutronix.de>, Pengutronix +#define pr_fmt(fmt) "of-reserved-mem: " fmt + #include <stdio.h> #include <of.h> #include <of_address.h> +#include <memory.h> +#include <linux/ioport.h> #define MEMRESERVE_NCELLS 2 -#define MEMRESERVE_FLAGS (IORESOURCE_MEM | IORESOURCE_EXCLUSIVE) -int of_reserved_mem_walk(int (*handler)(const struct resource *res)) +static void request_region(struct resource *r) +{ + struct memory_bank *bank; + + for_each_memory_bank(bank) { + if (!resource_contains(bank->res, r)) + continue; + + pr_debug("reserving %s at %pad-%pad\n", r->name, &r->start, &r->end); + + if (!reserve_sdram_region(r->name, r->start, resource_size(r))) + pr_warn("couldn't request reserved sdram region %pa-%pa\n", + &r->start, &r->end); + break; + } +} + +static int of_reserved_mem_walk(void) { struct device_node *node, *child; int ncells = 0; const __be32 *reg; - int ret; node = of_find_node_by_path("/reserved-memory"); if (node) { @@ -27,11 +46,9 @@ int of_reserved_mem_walk(int (*handler)(const struct resource *res)) of_address_to_resource(child, 0, &resource); resource.name = child->name; - resource.flags = MEMRESERVE_FLAGS; + resource.flags = IORESOURCE_MEM; - ret = handler(&resource); - if (ret) - return ret; + request_region(&resource); } } @@ -48,7 +65,7 @@ int of_reserved_mem_walk(int (*handler)(const struct resource *res)) snprintf(name, sizeof(name), "fdt-memreserve-%u", n++); resource.name = name; - resource.flags = MEMRESERVE_FLAGS; + resource.flags = IORESOURCE_MEM; resource.start = of_read_number(reg + i, MEMRESERVE_NCELLS); i += MEMRESERVE_NCELLS; @@ -61,11 +78,10 @@ int of_reserved_mem_walk(int (*handler)(const struct resource *res)) resource.end = resource.start + size - 1; - ret = handler(&resource); - if (ret) - return ret; + request_region(&resource); } } return 0; } +postmem_initcall(of_reserved_mem_walk); |