arm: lpc32xx: move SoC to mach-lpc32xx

Following the example of most other SoCs in arch/$(ARCH)/cpu/$(CPU)/$(SOC)
move the lpc32xx code from arch/arm/cpu/arm926ejs/lpc32xx to
arch/arm/mach-lpc32xx.

Following the checklist from
commit 01f14456306c ("ARM: prepare for moving SoC sources into mach-*"):

    [1] move files from arch/arm/cpu/arm926ejs/lpc32xx to arch/arm/mach-lpx32xx
    [2] add machine entry to arch/arm/Makefile
    [3] remove "obj-y += ..." from arch/arm/cpu/arm926ejs/Makefile
    [4] fix the Kconfig file path in arch/arm/Kconfig
    [5] (no MAINTAINERS update)

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Trevor Woerner <twoerner@gmail.com>

1 files changed, 44 insertions, 0 deletions

diff --git a/arch/arm/mach-lpc32xx/lowlevel_init.S b/arch/arm/mach-lpc32xx/lowlevel_init.S
new file mode 100644
index 0000000..d42da2b
--- /dev/null
+++ b/arch/arm/mach-lpc32xx/lowlevel_init.S
@@ -0,0 +1,44 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * WORK Microwave work_92105 board low level init
+ *
+ * (C) Copyright 2014  DENX Software Engineering GmbH
+ * Written-by: Albert ARIBAUD <albert.aribaud@3adev.fr>
+ *
+ * Low level init is called from SPL to set up the clocks.
+ * On entry, the LPC3250 is in Direct Run mode with all clocks
+ * running at 13 MHz; on exit, ARM clock is 208 MHz, HCLK is
+ * 104 MHz and PCLK is 13 MHz.
+ *
+ * This code must run from SRAM so that the clock changes do
+ * not prevent it from executing.
+ */
+
+.globl lowlevel_init
+
+lowlevel_init:
+
+	/* Set ARM, HCLK, PCLK dividers for normal mode */
+	ldr	r0, =0x0000003D
+	ldr	r1, =0x40004040
+	str	r0, [r1]
+
+	/* Start HCLK PLL for 208 MHz */
+	ldr	r0, =0x0001401E
+	ldr	r1, =0x40004058
+	str	r0, [r1]
+
+	/* wait for HCLK PLL to lock */
+1:
+	ldr	r0, [r1]
+	ands	r0, r0, #1
+	beq	1b
+
+	/* switch to normal mode */
+	ldr	r1, =0x40004044
+	ldr	r0, [r1]
+	orr	r0, #0x00000004
+	str	r0, [r1]
+
+	/* Return to U-Boot via saved link register */
+	mov	pc, lr