imx: Place imx_ddr_size() into a separate file

Place imx_ddr_size() into a separate file.

The motivation for doing this is to be able to easily reuse
imx_ddr_size() on i.MX7ULP.

Currently imx_ddr_size() is inside arch/arm/mach-imx/cpu.c, which
is not built for i.MX7ULP.

Changing the logic to allow building cpu.c for i.MX7UP would
require adding several ifdef's, leading to a not a very elegant
solution.

To allow better reuse, just place imx_ddr_size() into a common
mmdc_size.c file.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Stefano Babic <sbabic@denx.de>

arch/arm/mach-imx/Makefile

@@ -21,6 +21,9 @@ endif
 
 ifeq ($(SOC),$(filter $(SOC),mx5 mx6))
 obj-y	+= cpu.o speed.o
+ifneq ($(CONFIG_MX51),y)
+obj-y	+= mmdc_size.o
+endif
 obj-$(CONFIG_GPT_TIMER) += timer.o
 obj-$(CONFIG_SYS_I2C_MXC) += i2c-mxv7.o
 endif

arch/arm/mach-imx/cpu.c

@@ -87,59 +87,6 @@ static char *get_reset_cause(void)
 }
 #endif
 
-#if defined(CONFIG_MX53) || defined(CONFIG_MX6)
-#if defined(CONFIG_MX53)
-#define MEMCTL_BASE	ESDCTL_BASE_ADDR
-#else
-#define MEMCTL_BASE	MMDC_P0_BASE_ADDR
-#endif
-static const unsigned char col_lookup[] = {9, 10, 11, 8, 12, 9, 9, 9};
-static const unsigned char bank_lookup[] = {3, 2};
-
-/* these MMDC registers are common to the IMX53 and IMX6 */
-struct esd_mmdc_regs {
-	uint32_t	ctl;
-	uint32_t	pdc;
-	uint32_t	otc;
-	uint32_t	cfg0;
-	uint32_t	cfg1;
-	uint32_t	cfg2;
-	uint32_t	misc;
-};
-
-#define ESD_MMDC_CTL_GET_ROW(mdctl)	((ctl >> 24) & 7)
-#define ESD_MMDC_CTL_GET_COLUMN(mdctl)	((ctl >> 20) & 7)
-#define ESD_MMDC_CTL_GET_WIDTH(mdctl)	((ctl >> 16) & 3)
-#define ESD_MMDC_CTL_GET_CS1(mdctl)	((ctl >> 30) & 1)
-#define ESD_MMDC_MISC_GET_BANK(mdmisc)	((misc >> 5) & 1)
-
-/*
- * imx_ddr_size - return size in bytes of DRAM according MMDC config
- * The MMDC MDCTL register holds the number of bits for row, col, and data
- * width and the MMDC MDMISC register holds the number of banks. Combine
- * all these bits to determine the meme size the MMDC has been configured for
- */
-unsigned imx_ddr_size(void)
-{
-	struct esd_mmdc_regs *mem = (struct esd_mmdc_regs *)MEMCTL_BASE;
-	unsigned ctl = readl(&mem->ctl);
-	unsigned misc = readl(&mem->misc);
-	int bits = 11 + 0 + 0 + 1;      /* row + col + bank + width */
-
-	bits += ESD_MMDC_CTL_GET_ROW(ctl);
-	bits += col_lookup[ESD_MMDC_CTL_GET_COLUMN(ctl)];
-	bits += bank_lookup[ESD_MMDC_MISC_GET_BANK(misc)];
-	bits += ESD_MMDC_CTL_GET_WIDTH(ctl);
-	bits += ESD_MMDC_CTL_GET_CS1(ctl);
-
-	/* The MX6 can do only 3840 MiB of DRAM */
-	if (bits == 32)
-		return 0xf0000000;
-
-	return 1 << bits;
-}
-#endif
-
 #if defined(CONFIG_DISPLAY_CPUINFO) && !defined(CONFIG_SPL_BUILD)
 
 const char *get_imx_type(u32 imxtype)

arch/arm/mach-imx/mmdc_size.c

@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <common.h>
+#include <asm/io.h>
+
+#if defined(CONFIG_MX53)
+#define MEMCTL_BASE	ESDCTL_BASE_ADDR
+#else
+#define MEMCTL_BASE	MMDC_P0_BASE_ADDR
+#endif
+static const unsigned char col_lookup[] = {9, 10, 11, 8, 12, 9, 9, 9};
+static const unsigned char bank_lookup[] = {3, 2};
+
+/* these MMDC registers are common to the IMX53 and IMX6 */
+struct esd_mmdc_regs {
+	uint32_t	ctl;
+	uint32_t	pdc;
+	uint32_t	otc;
+	uint32_t	cfg0;
+	uint32_t	cfg1;
+	uint32_t	cfg2;
+	uint32_t	misc;
+};
+
+#define ESD_MMDC_CTL_GET_ROW(mdctl)	((ctl >> 24) & 7)
+#define ESD_MMDC_CTL_GET_COLUMN(mdctl)	((ctl >> 20) & 7)
+#define ESD_MMDC_CTL_GET_WIDTH(mdctl)	((ctl >> 16) & 3)
+#define ESD_MMDC_CTL_GET_CS1(mdctl)	((ctl >> 30) & 1)
+#define ESD_MMDC_MISC_GET_BANK(mdmisc)	((misc >> 5) & 1)
+
+/*
+ * imx_ddr_size - return size in bytes of DRAM according MMDC config
+ * The MMDC MDCTL register holds the number of bits for row, col, and data
+ * width and the MMDC MDMISC register holds the number of banks. Combine
+ * all these bits to determine the meme size the MMDC has been configured for
+ */
+unsigned imx_ddr_size(void)
+{
+	struct esd_mmdc_regs *mem = (struct esd_mmdc_regs *)MEMCTL_BASE;
+	unsigned ctl = readl(&mem->ctl);
+	unsigned misc = readl(&mem->misc);
+	int bits = 11 + 0 + 0 + 1;      /* row + col + bank + width */
+
+	bits += ESD_MMDC_CTL_GET_ROW(ctl);
+	bits += col_lookup[ESD_MMDC_CTL_GET_COLUMN(ctl)];
+	bits += bank_lookup[ESD_MMDC_MISC_GET_BANK(misc)];
+	bits += ESD_MMDC_CTL_GET_WIDTH(ctl);
+	bits += ESD_MMDC_CTL_GET_CS1(ctl);
+
+	/* The MX6 can do only 3840 MiB of DRAM */
+	if (bits == 32)
+		return 0xf0000000;
+
+	return 1 << bits;
+}