st_smi: Add support for SPEAr SMI driver

SMI is the serial memory interface controller provided by ST.

Earlier, a driver exists in the u-boot source code for the SMI IP. However, it
was specific to spear platforms. This commit converts the same driver to a more
generic driver. As a result, the driver files are renamed to st_smi.c and
st_smi.h and moved into drivers/mtd folder for reusability by other platforms
using smi controller peripheral.

Signed-off-by: Vipin Kumar <vipin.kumar@st.com>
Signed-off-by: Amit Virdi <amit.virdi@st.com>
Signed-off-by: Stefan Roese <sr@denx.de>

drivers/mtd/Makefile

@@ -35,7 +35,7 @@ COBJS-$(CONFIG_HAS_DATAFLASH) += dataflash.o
 COBJS-$(CONFIG_FTSMC020) += ftsmc020.o
 COBJS-$(CONFIG_FLASH_CFI_LEGACY) += jedec_flash.o
 COBJS-$(CONFIG_MW_EEPROM) += mw_eeprom.o
-COBJS-$(CONFIG_SPEARSMI) += spr_smi.o
+COBJS-$(CONFIG_ST_SMI) += st_smi.o
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)

drivers/mtd/spr_smi.c → drivers/mtd/st_smi.c

@@ -1,6 +1,6 @@
 /*
  * (C) Copyright 2009
- * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
+ * Vipin Kumar, ST Microelectronics, vipin.kumar@st.com.
  *
  * See file CREDITS for list of people who contributed to this
  * project.
@@ -24,10 +24,10 @@
 #include <common.h>
 #include <flash.h>
 #include <linux/err.h>
+#include <linux/mtd/st_smi.h>
 
 #include <asm/io.h>
 #include <asm/arch/hardware.h>
-#include <asm/arch/spr_smi.h>
 
 #if !defined(CONFIG_SYS_NO_FLASH)
 
@@ -82,6 +82,7 @@ static unsigned int smi_read_id(flash_info_t *info, int banknum)
 	writel(READ_ID, &smicntl->smi_tr);
 	writel((banknum << BANKSEL_SHIFT) | SEND | TX_LEN_1 | RX_LEN_3,
 	       &smicntl->smi_cr2);
+
 	smi_wait_xfer_finish(XFER_FINISH_TOUT);
 
 	value = (readl(&smicntl->smi_rr) & 0x00FFFFFF);
@@ -232,7 +233,7 @@ static int smi_write_enable(int bank)
  *
  * SMI initialization routine. Sets SMI control register1.
  */
-static void smi_init(void)
+void smi_init(void)
 {
 	/* Setting the fast mode values. SMI working at 166/4 = 41.5 MHz */
 	writel(HOLD1 | FAST_MODE | BANK_EN | DSEL_TIME | PRESCAL4,

include/configs/spear-common.h

@@ -55,10 +55,10 @@
 #if defined(CONFIG_FLASH_PNOR)
 #define CONFIG_SPEAR_EMI			1
 #else
-#define CONFIG_SPEARSMI				1
+#define CONFIG_ST_SMI
 #endif
 
-#if defined(CONFIG_SPEARSMI)
+#if defined(CONFIG_ST_SMI)
 
 #define CONFIG_SYS_MAX_FLASH_BANKS		2
 #define CONFIG_SYS_FLASH_BASE			(0xF8000000)
@@ -125,7 +125,7 @@
  * U-Boot Environment placing definitions.
  */
 #if defined(CONFIG_ENV_IS_IN_FLASH)
-#ifdef CONFIG_SPEARSMI
+#ifdef CONFIG_ST_SMI
 /*
  * Environment is in serial NOR flash
  */

arch/arm/include/asm/arch-spear/spr_smi.h → include/linux/mtd/st_smi.h

@@ -21,8 +21,8 @@
  * MA 02111-1307 USA
  */
 
-#ifndef SPR_SMI_H
-#define SPR_SMI_H
+#ifndef ST_SMI_H
+#define ST_SMI_H
 
 /* 0xF800.0000 . 0xFBFF.FFFF	64MB	SMI (Serial Flash Mem) */
 /* 0xFC00.0000 . 0xFC1F.FFFF	2MB	SMI (Serial Flash Reg.) */
@@ -112,4 +112,6 @@ struct flash_dev {
 #define XFER_FINISH_TOUT	2	/* xfer finish timeout */
 #define WMODE_TOUT		2	/* write enable timeout */
 
+extern void smi_init(void);
+
 #endif