ppc: lmb: move arch specific lmb reservations to arch_misc_init()

All the current function definitions of arch_lmb_reserve() are doing
the same thing -- reserve the U-Boot memory region. The powerpc(ppc)
architecture, in addition, is making some LMB reservations for the
bootm related image loading. Move these ppc specific reservations to
the arch_misc_init() function. This allows to move the U-Boot memory
region reservation to a different function, and remove
arch_lmb_reserve() in a subsequent commit.

Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>

1 files changed, 62 insertions, 0 deletions

diff --git a/arch/powerpc/lib/misc.c b/arch/powerpc/lib/misc.c
new file mode 100644
index 00000000000..4cd23b3406d
--- /dev/null
+++ b/arch/powerpc/lib/misc.c
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2024 Linaro Ltd.
+ */
+
+#include <image.h>
+#include <init.h>
+#include <lmb.h>
+
+#include <asm/mp.h>
+#include <dm/device.h>
+#include <dm/uclass.h>
+
+#ifndef CFG_SYS_LINUX_LOWMEM_MAX_SIZE
+#define CFG_SYS_LINUX_LOWMEM_MAX_SIZE	(768 * 1024 * 1024)
+#endif
+
+int arch_misc_init(void)
+{
+	if (CONFIG_IS_ENABLED(CMD_BOOTM)) {
+		phys_size_t bootm_size;
+		ulong size, bootmap_base;
+
+		bootmap_base = env_get_bootm_low();
+		bootm_size = env_get_bootm_size();
+
+#ifdef DEBUG
+		if (((u64)bootmap_base + bootm_size) >
+		    (CFG_SYS_SDRAM_BASE + (u64)gd->ram_size))
+			puts("WARNING: bootm_low + bootm_size exceed total memory\n");
+		if ((bootmap_base + bootm_size) > get_effective_memsize())
+			puts("WARNING: bootm_low + bootm_size exceed eff. memory\n");
+#endif
+
+		size = min(bootm_size, get_effective_memsize());
+		size = min(size, (ulong)CFG_SYS_LINUX_LOWMEM_MAX_SIZE);
+
+		if (size < bootm_size) {
+			ulong base = bootmap_base + size;
+
+			printf("WARNING: adjusting available memory from 0x%lx to 0x%llx\n",
+			       size, (unsigned long long)bootm_size);
+			lmb_reserve(base, bootm_size - size);
+		}
+
+#ifdef CONFIG_MP
+		cpu_mp_lmb_reserve();
+#endif
+	}
+
+	if (IS_ENABLED(CONFIG_FSL_CAAM)) {
+		struct udevice *dev;
+		int ret;
+
+		ret = uclass_get_device_by_driver(UCLASS_MISC,
+						  DM_DRIVER_GET(caam_jr), &dev);
+		if (ret)
+			printf("Failed to initialize caam_jr: %d\n", ret);
+	}
+
+	return 0;
+}