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authorGeert Uytterhoeven <geert+renesas@glider.be>2017-01-25 12:02:13 +0300
committerSimon Horman <horms+renesas@verge.net.au>2017-01-25 13:28:28 +0300
commitaa7f39d51e33555fc45645c08bc74a74e22b166f (patch)
tree9f889bfcd2392637d2209a09252be6fcb236e05f /arch/arm/mach-shmobile
parent70def3e53694a65c5583fb5f411491a5074bab18 (diff)
downloadlinux-aa7f39d51e33555fc45645c08bc74a74e22b166f.tar.xz
ARM: shmobile: rcar-gen2: Add more register documentation
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Diffstat (limited to 'arch/arm/mach-shmobile')
-rw-r--r--arch/arm/mach-shmobile/pm-rcar-gen2.c40
1 files changed, 29 insertions, 11 deletions
diff --git a/arch/arm/mach-shmobile/pm-rcar-gen2.c b/arch/arm/mach-shmobile/pm-rcar-gen2.c
index dd9ac366868f..0178da7ace82 100644
--- a/arch/arm/mach-shmobile/pm-rcar-gen2.c
+++ b/arch/arm/mach-shmobile/pm-rcar-gen2.c
@@ -20,14 +20,30 @@
/* RST */
#define RST 0xe6160000
-#define CA15BAR 0x0020
-#define CA7BAR 0x0030
-#define CA15RESCNT 0x0040
-#define CA7RESCNT 0x0044
+
+#define CA15BAR 0x0020 /* CA15 Boot Address Register */
+#define CA7BAR 0x0030 /* CA7 Boot Address Register */
+#define CA15RESCNT 0x0040 /* CA15 Reset Control Register */
+#define CA7RESCNT 0x0044 /* CA7 Reset Control Register */
+
+/* SYS Boot Address Register */
+#define SBAR_BAREN BIT(4) /* SBAR is valid */
+
+/* Reset Control Registers */
+#define CA15RESCNT_CODE 0xa5a50000
+#define CA15RESCNT_CPUS 0xf /* CPU0-3 */
+#define CA7RESCNT_CODE 0x5a5a0000
+#define CA7RESCNT_CPUS 0xf /* CPU0-3 */
+
/* On-chip RAM */
#define ICRAM1 0xe63c0000 /* Inter Connect RAM1 (4 KiB) */
+static inline u32 phys_to_sbar(phys_addr_t addr)
+{
+ return (addr >> 8) & 0xfffffc00;
+}
+
/* SYSC */
#define SYSCIER 0x0c
#define SYSCIMR 0x10
@@ -82,22 +98,24 @@ void __init rcar_gen2_pm_init(void)
/* setup reset vectors */
p = ioremap_nocache(RST, 0x63);
- bar = (boot_vector_addr >> 8) & 0xfffffc00;
+ bar = phys_to_sbar(boot_vector_addr);
if (has_a15) {
writel_relaxed(bar, p + CA15BAR);
- writel_relaxed(bar | 0x10, p + CA15BAR);
+ writel_relaxed(bar | SBAR_BAREN, p + CA15BAR);
/* de-assert reset for CA15 CPUs */
- writel_relaxed((readl_relaxed(p + CA15RESCNT) & ~0x0f) |
- 0xa5a50000, p + CA15RESCNT);
+ writel_relaxed((readl_relaxed(p + CA15RESCNT) &
+ ~CA15RESCNT_CPUS) | CA15RESCNT_CODE,
+ p + CA15RESCNT);
}
if (has_a7) {
writel_relaxed(bar, p + CA7BAR);
- writel_relaxed(bar | 0x10, p + CA7BAR);
+ writel_relaxed(bar | SBAR_BAREN, p + CA7BAR);
/* de-assert reset for CA7 CPUs */
- writel_relaxed((readl_relaxed(p + CA7RESCNT) & ~0x0f) |
- 0x5a5a0000, p + CA7RESCNT);
+ writel_relaxed((readl_relaxed(p + CA7RESCNT) &
+ ~CA7RESCNT_CPUS) | CA7RESCNT_CODE,
+ p + CA7RESCNT);
}
iounmap(p);