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ARM: shmobile: rcar-gen2: Obtain jump stub region from DT

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Add support for obtaining from DT the SRAM region to store the jump stub
for CPU core bringup, according to the renesas,smp-sram DT bindings.

If no region is specified in DT, the code falls back to hardcoded ICRAM1
as before, to maintain backwards compatibility.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Geert Uytterhoeven 2017-07-04 17:41:36 +02:00 committed by Simon Horman
parent fcfbb6f144
commit 816756962b
1 changed files with 30 additions and 3 deletions
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33
arch/arm/mach-shmobile/pm-rcar-gen2.c
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@ -11,7 +11,9 @@
*/
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/smp.h>
#include <linux/soc/renesas/rcar-sysc.h>
#include <asm/io.h>
@ -69,8 +71,9 @@ void __init rcar_gen2_pm_init(void)
struct device_node *np, *cpus;
bool has_a7 = false;
bool has_a15 = false;
phys_addr_t boot_vector_addr = ICRAM1;
struct resource res;
u32 syscier = 0;
int error;
if (once++)
return;
@ -91,14 +94,38 @@ void __init rcar_gen2_pm_init(void)
else if (of_machine_is_compatible("renesas,r8a7791"))
syscier = 0x00111003;
np = of_find_compatible_node(NULL, NULL, "renesas,smp-sram");
if (!np) {
/* No smp-sram in DT, fall back to hardcoded address */
res = (struct resource)DEFINE_RES_MEM(ICRAM1,
shmobile_boot_size);
goto map;
}
error = of_address_to_resource(np, 0, &res);
if (error) {
pr_err("Failed to get smp-sram address: %d\n", error);
return;
}
map:
/* RAM for jump stub, because BAR requires 256KB aligned address */
p = ioremap_nocache(boot_vector_addr, shmobile_boot_size);
if (res.start & (256 * 1024 - 1) ||
resource_size(&res) < shmobile_boot_size) {
pr_err("Invalid smp-sram region\n");
return;
}
p = ioremap(res.start, resource_size(&res));
if (!p)
return;
memcpy_toio(p, shmobile_boot_vector, shmobile_boot_size);
iounmap(p);
/* setup reset vectors */
p = ioremap_nocache(RST, 0x63);
bar = phys_to_sbar(boot_vector_addr);
bar = phys_to_sbar(res.start);
if (has_a15) {
writel_relaxed(bar, p + CA15BAR);
writel_relaxed(bar | SBAR_BAREN, p + CA15BAR);