drivers: rkflash: Add RK_SFTL configuration

Avoid adding redundant FTL code to SPI Nand MTD case.

make ARCH=arm rv1126_defconfig test, size -t drivers/rkflash/built-in.a
the former size:
CONFIG_RK_SFC_NAND=y
CONFIG_RK_SFC_NAND_MTD=y
CONFIG_RK_SFC_NOR=y
CONFIG_RK_SFC_NOR_MTD=y
text    data     bss     dec     hex filename
83237    2757   23716  109710   1ac8e (TOTALS)

after adjust:
31677    2705    3624   38006    9476 (TOTALS)

For Nor only:
CONFIG_RK_SFC_NOR=y
CONFIG_RK_SFC_NOR_MTD=y
19350    1237    2568   23155    5a73 (TOTALS)

Change-Id: I46186393de26512566cc62ceb1490ef35a70be1d
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>

drivers/rkflash/Kconfig

@@ -17,6 +17,15 @@ if RK_FLASH
 
 comment "Rockchip Flash Devices"
 
+config RK_SFTL
+	tristate "Rockchip Slc Nand FTL support"
+	default y
+	depends on (RK_NAND || (RK_SFC_NAND && RK_SFC_NAND_MTD !=y))
+	help
+	  This enables support for Slc Nand FTL.
+
+	  Say Y when you have a board with Slc Nand Flash register as block device.
+
 config RK_NANDC_NAND
 	tristate "Rockchip NANDC Slc Nand Devices support"
 	default n

drivers/rkflash/Makefile

@@ -1,11 +1,13 @@
 # SPDX-License-Identifier: GPL-2.0
 
-obj-$(CONFIG_RK_NANDC_NAND) += rkflash_blk.o rkflash_debug.o rksftl.o rknandc_base.o nand_boot.o flash.o nandc.o
+obj-$(CONFIG_RK_NANDC_NAND) += rkflash_blk.o rkflash_debug.o rknandc_base.o nand_boot.o flash.o nandc.o
-obj-$(CONFIG_RK_SFC_NAND) += rkflash_blk.o rkflash_debug.o rksftl.o rksfc_base.o sfc_nand_boot.o sfc_nand.o sfc.o
+obj-$(CONFIG_RK_SFC_NAND) += rkflash_blk.o rkflash_debug.o rksfc_base.o sfc_nand_boot.o sfc_nand.o sfc.o
 obj-$(CONFIG_RK_SFC_NAND_MTD) += sfc_nand_mtd.o sfc_nand_mtd_bbt.o
 obj-$(CONFIG_RK_SFC_NOR) += rkflash_blk.o rkflash_debug.o rksfc_base.o sfc_nor_boot.o sfc_nor.o sfc.o
 obj-$(CONFIG_RK_SFC_NOR_MTD) += sfc_nor_mtd.o
 
+obj-$(CONFIG_RK_SFTL) += rksftl.o
+
 ifdef CONFIG_THUMB2_KERNEL
 rksftl-$(CONFIG_THUMB2_KERNEL) += rk_sftl_arm_v7_thumb.o
 else

drivers/rkflash/rkflash_blk.c

@@ -152,7 +152,7 @@ static int rkflash_blk_proc_show(struct seq_file *m, void *v)
 {
 	char *ftl_buf = kzalloc(4096, GFP_KERNEL);
 
-#if IS_ENABLED(CONFIG_RK_NANDC_NAND) || IS_ENABLED(CONFIG_RK_SFC_NAND)
+#if IS_ENABLED(CONFIG_RK_SFTL)
 	int real_size = 0;
 
 	real_size = rknand_proc_ftlread(4096, ftl_buf);
@@ -694,7 +694,7 @@ int rkflash_dev_init(void __iomem *reg_addr,
 		break;
 #endif
 	case FLASH_TYPE_NANDC_NAND:
-#if defined(CONFIG_RK_SFC_NAND) || defined(CONFIG_RK_NANDC_NAND)
+#if defined(CONFIG_RK_SFTL)
 		rk_sftl_vendor_dev_ops_register(rkflash_dev_vendor_read,
 						rkflash_dev_vendor_write);
 		ret = rk_sftl_vendor_storage_init();

drivers/rkflash/sfc_nand.c

@@ -954,6 +954,7 @@ int sfc_nand_read_id(u8 *data)
 	return ret;
 }
 
+#if defined(CONFIG_RK_SFTL)
 /*
  * Read the 1st page's 1st byte of a phy_blk
  * If not FF, it's bad blk
@@ -1008,6 +1009,7 @@ void sfc_nand_ftl_ops_init(void)
 	g_nand_ops.read_page		= sfc_nand_read_page;
 	g_nand_ops.bch_sel		= NULL;
 }
+#endif
 
 static int sfc_nand_enable_QE(void)
 {

drivers/rkflash/sfc_nand_boot.c

@@ -17,9 +17,11 @@ static int snand_init(void __iomem *reg_addr)
 	ret = sfc_nand_init();
 	if (ret == 0) {
 		sfnand_dev = sfc_nand_get_private_dev();
-#ifndef CONFIG_RK_SFC_NAND_MTD
+#if defined(CONFIG_RK_SFTL)
 		sfc_nand_ftl_ops_init();
 		ret = sftl_init();
+#elif !defined(CONFIG_RK_SFC_NAND_MTD)
+#error "When CONFIG_RK_SFC_NAND_MTD is not used, CONFIG_RK_SFTL is required!"
 #endif
 	}
 
@@ -28,44 +30,57 @@ static int snand_init(void __iomem *reg_addr)
 
 static unsigned int snand_get_capacity(void)
 {
-	return sftl_get_density();
+	if (IS_ENABLED(CONFIG_RK_SFTL))
+		return sftl_get_density();
+	return 0;
 }
 
 static int snand_write(u32 sec, u32 n_sec, void *p_data)
 {
-	return sftl_write(sec, n_sec, p_data);
+	if (IS_ENABLED(CONFIG_RK_SFTL))
+		return sftl_write(sec, n_sec, p_data);
+	return 0;
 }
 
 static int snand_read(u32 sec, u32 n_sec, void *p_data)
 {
-	return sftl_read(sec, n_sec, p_data);
+	if (IS_ENABLED(CONFIG_RK_SFTL))
+		return sftl_read(sec, n_sec, p_data);
+	return 0;
 }
 
 static int snand_vendor_read(u32 sec, u32 n_sec, void *p_data)
 {
-	return sftl_vendor_read(sec, n_sec, p_data);
+	if (IS_ENABLED(CONFIG_RK_SFTL))
+		return sftl_vendor_read(sec, n_sec, p_data);
+	return 0;
 }
 
 static int snand_vendor_write(u32 sec, u32 n_sec, void *p_data)
 {
-	return sftl_vendor_write(sec, n_sec, p_data);
+	if (IS_ENABLED(CONFIG_RK_SFTL))
+		return sftl_vendor_write(sec, n_sec, p_data);
+	return 0;
 }
 
 static int snand_gc(void)
 {
-	return sftl_gc();
+	if (IS_ENABLED(CONFIG_RK_SFTL))
+		return sftl_gc();
+	return 0;
 }
 
 static int snand_discard(u32 sec, u32 n_sec)
 {
-	return sftl_discard(sec, n_sec);
+	if (IS_ENABLED(CONFIG_RK_SFTL))
+		return sftl_discard(sec, n_sec);
+	return 0;
 }
 
 static void snand_deinit(void)
 {
-#ifndef CONFIG_RK_SFC_NAND_MTD
+	if (IS_ENABLED(CONFIG_RK_SFTL))
-	sftl_deinit();
+		sftl_deinit();
-#endif
 	sfc_nand_deinit();
 }