ARM: shmobile: r8a7779: Reserve boot area when SMP is enabled

CPU core bringup on R-Car H1 uses the ARM Reset Vector Address Register
(AVECR) to specify the base address and size of the boot area of the
System CPU.  With this enabled, when the System CPU accesses a physical
address in the range from zero up to the configured size, the top
address bits are replaced by those specified in the AVECR register.
Hence any device residing in this low part of physical address space
cannot be accessed,

Prevent conflicts by reserving this memory region using
request_mem_region().

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/924961188abdf2adb52167edb7ed848a6efcca39.1693409184.git.geert+renesas@glider.be

diff --git a/arch/arm/mach-shmobile/smp-r8a7779.c b/arch/arm/mach-shmobile/smp-r8a7779.c
index 1bc609986c160d2be10a3c72358b36bcdc3806de..474c325323a38d8b131f720b3c0c3778a9eb1f8d 100644 (file)
--- a/arch/arm/mach-shmobile/smp-r8a7779.c
+++ b/arch/arm/mach-shmobile/smp-r8a7779.c
@@ -38,7 +38,14 @@ static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
 
 static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
 {
-       void __iomem *base = ioremap(HPBREG_BASE, 0x1000);
+       void __iomem *base;
+
+       if (!request_mem_region(0, SZ_4K, "Boot Area")) {
+               pr_err("Failed to request boot area\n");
+               return;
+       }
+
+       base = ioremap(HPBREG_BASE, 0x1000);
 
        /* Map the reset vector (in headsmp-scu.S, headsmp.S) */
        writel(__pa(shmobile_boot_vector), base + AVECR);