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>

1 files changed, 117 insertions, 0 deletions

diff --git a/include/linux/mtd/st_smi.h b/include/linux/mtd/st_smi.h
new file mode 100644
index 0000000..b7a78ac
--- /dev/null
+++ b/include/linux/mtd/st_smi.h
@@ -0,0 +1,117 @@
+/*
+ * (C) Copyright 2009
+ * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#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.) */
+
+#define FLASH_START_ADDRESS	CONFIG_SYS_FLASH_BASE
+#define FLASH_BANK_SIZE		CONFIG_SYS_FLASH_BANK_SIZE
+
+#define SMIBANK0_BASE		(FLASH_START_ADDRESS)
+#define SMIBANK1_BASE		(SMIBANK0_BASE + FLASH_BANK_SIZE)
+#define SMIBANK2_BASE		(SMIBANK1_BASE + FLASH_BANK_SIZE)
+#define SMIBANK3_BASE		(SMIBANK2_BASE + FLASH_BANK_SIZE)
+
+#define BANK0			0
+#define BANK1			1
+#define BANK2			2
+#define BANK3			3
+
+struct smi_regs {
+	u32 smi_cr1;
+	u32 smi_cr2;
+	u32 smi_sr;
+	u32 smi_tr;
+	u32 smi_rr;
+};
+
+/* CONTROL REG 1 */
+#define BANK_EN			0x0000000F	/* enables all banks */
+#define DSEL_TIME		0x00000060	/* Deselect time */
+#define PRESCAL5		0x00000500	/* AHB_CK prescaling value */
+#define PRESCALA		0x00000A00	/* AHB_CK prescaling value */
+#define PRESCAL3		0x00000300	/* AHB_CK prescaling value */
+#define PRESCAL4		0x00000400	/* AHB_CK prescaling value */
+#define SW_MODE			0x10000000	/* enables SW Mode */
+#define WB_MODE			0x20000000	/* Write Burst Mode */
+#define FAST_MODE		0x00008000	/* Fast Mode */
+#define HOLD1			0x00010000
+
+/* CONTROL REG 2 */
+#define RD_STATUS_REG		0x00000400	/* reads status reg */
+#define WE			0x00000800	/* Write Enable */
+#define BANK0_SEL		0x00000000	/* Select Banck0 */
+#define BANK1_SEL		0x00001000	/* Select Banck1 */
+#define BANK2_SEL		0x00002000	/* Select Banck2 */
+#define BANK3_SEL		0x00003000	/* Select Banck3 */
+#define BANKSEL_SHIFT		12
+#define SEND			0x00000080	/* Send data */
+#define TX_LEN_1		0x00000001	/* data length = 1 byte */
+#define TX_LEN_2		0x00000002	/* data length = 2 byte */
+#define TX_LEN_3		0x00000003	/* data length = 3 byte */
+#define TX_LEN_4		0x00000004	/* data length = 4 byte */
+#define RX_LEN_1		0x00000010	/* data length = 1 byte */
+#define RX_LEN_2		0x00000020	/* data length = 2 byte */
+#define RX_LEN_3		0x00000030	/* data length = 3 byte */
+#define RX_LEN_4		0x00000040	/* data length = 4 byte */
+#define TFIE			0x00000100	/* Tx Flag Interrupt Enable */
+#define WCIE			0x00000200	/* WCF Interrupt Enable */
+
+/* STATUS_REG */
+#define INT_WCF_CLR		0xFFFFFDFF	/* clear: WCF clear */
+#define INT_TFF_CLR		0xFFFFFEFF	/* clear: TFF clear */
+#define WIP_BIT			0x00000001	/* WIP Bit of SPI SR */
+#define WEL_BIT			0x00000002	/* WEL Bit of SPI SR */
+#define RSR			0x00000005	/* Read Status regiser */
+#define TFF			0x00000100	/* Transfer Finished FLag */
+#define WCF			0x00000200	/* Transfer Finished FLag */
+#define ERF1			0x00000400	/* Error Flag 1 */
+#define ERF2			0x00000800	/* Error Flag 2 */
+#define WM0			0x00001000	/* WM Bank 0 */
+#define WM1			0x00002000	/* WM Bank 1 */
+#define WM2			0x00004000	/* WM Bank 2 */
+#define WM3			0x00008000	/* WM Bank 3 */
+#define WM_SHIFT		12
+
+/* TR REG */
+#define READ_ID			0x0000009F	/* Read Identification */
+#define BULK_ERASE		0x000000C7	/* BULK erase */
+#define SECTOR_ERASE		0x000000D8	/* SECTOR erase */
+#define WRITE_ENABLE		0x00000006	/* Wenable command to FLASH */
+
+struct flash_dev {
+	u32 density;
+	ulong size;
+	ushort sector_count;
+};
+
+#define SFLASH_PAGE_SIZE	0x100	/* flash page size */
+#define XFER_FINISH_TOUT	2	/* xfer finish timeout */
+#define WMODE_TOUT		2	/* write enable timeout */
+
+extern void smi_init(void);
+
+#endif