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, 0 insertions, 518 deletions

diff --git a/drivers/mtd/spr_smi.c b/drivers/mtd/spr_smi.c
deleted file mode 100644
index 6d4257a3f5..0000000000
--- a/drivers/mtd/spr_smi.c
+++ /dev/null
@@ -1,518 +0,0 @@
-/*
- * (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
- */
-
-#include <common.h>
-#include <flash.h>
-#include <linux/err.h>
-
-#include <asm/io.h>
-#include <asm/arch/hardware.h>
-#include <asm/arch/spr_smi.h>
-
-#if !defined(CONFIG_SYS_NO_FLASH)
-
-static struct smi_regs *const smicntl =
-    (struct smi_regs * const)CONFIG_SYS_SMI_BASE;
-static ulong bank_base[CONFIG_SYS_MAX_FLASH_BANKS] =
-    CONFIG_SYS_FLASH_ADDR_BASE;
-flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];
-
-#define ST_M25Pxx_ID		0x00002020
-
-static struct flash_dev flash_ids[] = {
-	{0x10, 0x10000, 2},	/* 64K Byte */
-	{0x11, 0x20000, 4},	/* 128K Byte */
-	{0x12, 0x40000, 4},	/* 256K Byte */
-	{0x13, 0x80000, 8},	/* 512K Byte */
-	{0x14, 0x100000, 16},	/* 1M Byte */
-	{0x15, 0x200000, 32},	/* 2M Byte */
-	{0x16, 0x400000, 64},	/* 4M Byte */
-	{0x17, 0x800000, 128},	/* 8M Byte */
-	{0x18, 0x1000000, 64},	/* 16M Byte */
-	{0x00,}
-};
-
-/*
- * smi_wait_xfer_finish - Wait until TFF is set in status register
- * @timeout:	 timeout in milliseconds
- *
- * Wait until TFF is set in status register
- */
-static void smi_wait_xfer_finish(int timeout)
-{
-	while (timeout--) {
-		if (readl(&smicntl->smi_sr) & TFF)
-			break;
-		udelay(1000);
-	}
-}
-
-/*
- * smi_read_id - Read flash id
- * @info:	 flash_info structure pointer
- * @banknum:	 bank number
- *
- * Read the flash id present at bank #banknum
- */
-static unsigned int smi_read_id(flash_info_t *info, int banknum)
-{
-	unsigned int value;
-
-	writel(readl(&smicntl->smi_cr1) | SW_MODE, &smicntl->smi_cr1);
-	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);
-
-	writel(readl(&smicntl->smi_sr) & ~TFF, &smicntl->smi_sr);
-	writel(readl(&smicntl->smi_cr1) & ~SW_MODE, &smicntl->smi_cr1);
-
-	return value;
-}
-
-/*
- * flash_get_size - Detect the SMI flash by reading the ID.
- * @base:	 Base address of the flash area bank #banknum
- * @banknum:	 Bank number
- *
- * Detect the SMI flash by reading the ID. Initializes the flash_info structure
- * with size, sector count etc.
- */
-static ulong flash_get_size(ulong base, int banknum)
-{
-	flash_info_t *info = &flash_info[banknum];
-	struct flash_dev *dev;
-	unsigned int value;
-	unsigned int density;
-	int i;
-
-	value = smi_read_id(info, banknum);
-	density = (value >> 16) & 0xff;
-
-	for (i = 0, dev = &flash_ids[0]; dev->density != 0x0;
-	     i++, dev = &flash_ids[i]) {
-		if (dev->density == density) {
-			info->size = dev->size;
-			info->sector_count = dev->sector_count;
-			break;
-		}
-	}
-
-	if (dev->density == 0x0)
-		return 0;
-
-	info->flash_id = value & 0xffff;
-	info->start[0] = base;
-
-	return info->size;
-}
-
-/*
- * smi_read_sr - Read status register of SMI
- * @bank:	 bank number
- *
- * This routine will get the status register of the flash chip present at the
- * given bank
- */
-static unsigned int smi_read_sr(int bank)
-{
-	u32 ctrlreg1;
-
-	/* store the CTRL REG1 state */
-	ctrlreg1 = readl(&smicntl->smi_cr1);
-
-	/* Program SMI in HW Mode */
-	writel(readl(&smicntl->smi_cr1) & ~(SW_MODE | WB_MODE),
-	       &smicntl->smi_cr1);
-
-	/* Performing a RSR instruction in HW mode */
-	writel((bank << BANKSEL_SHIFT) | RD_STATUS_REG, &smicntl->smi_cr2);
-
-	smi_wait_xfer_finish(XFER_FINISH_TOUT);
-
-	/* Restore the CTRL REG1 state */
-	writel(ctrlreg1, &smicntl->smi_cr1);
-
-	return readl(&smicntl->smi_sr);
-}
-
-/*
- * smi_wait_till_ready - Wait till last operation is over.
- * @bank:	 bank number shifted.
- * @timeout:	 timeout in milliseconds.
- *
- * This routine checks for WIP(write in progress)bit in Status register(SMSR-b0)
- * The routine checks for #timeout loops, each at interval of 1 milli-second.
- * If successful the routine returns 0.
- */
-static int smi_wait_till_ready(int bank, int timeout)
-{
-	int count;
-	unsigned int sr;
-
-	/* One chip guarantees max 5 msec wait here after page writes,
-	   but potentially three seconds (!) after page erase. */
-	for (count = 0; count < timeout; count++) {
-
-		sr = smi_read_sr(bank);
-		if (sr < 0)
-			break;
-		else if (!(sr & WIP_BIT))
-			return 0;
-
-		/* Try again after 1m-sec */
-		udelay(1000);
-	}
-	printf("SMI controller is still in wait, timeout=%d\n", timeout);
-	return -EIO;
-}
-
-/*
- * smi_write_enable - Enable the flash to do write operation
- * @bank:	 bank number
- *
- * Set write enable latch with Write Enable command.
- * Returns negative if error occurred.
- */
-static int smi_write_enable(int bank)
-{
-	u32 ctrlreg1;
-	int timeout = WMODE_TOUT;
-
-	/* Store the CTRL REG1 state */
-	ctrlreg1 = readl(&smicntl->smi_cr1);
-
-	/* Program SMI in H/W Mode */
-	writel(readl(&smicntl->smi_cr1) & ~SW_MODE, &smicntl->smi_cr1);
-
-	/* Give the Flash, Write Enable command */
-	writel((bank << BANKSEL_SHIFT) | WE, &smicntl->smi_cr2);
-
-	smi_wait_xfer_finish(XFER_FINISH_TOUT);
-
-	/* Restore the CTRL REG1 state */
-	writel(ctrlreg1, &smicntl->smi_cr1);
-
-	while (timeout--) {
-		if (smi_read_sr(bank) & (1 << (bank + WM_SHIFT)))
-			break;
-		udelay(1000);
-	}
-
-	if (timeout)
-		return 0;
-
-	return -1;
-}
-
-/*
- * smi_init - SMI initialization routine
- *
- * SMI initialization routine. Sets SMI control register1.
- */
-static 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,
-	       &smicntl->smi_cr1);
-}
-
-/*
- * smi_sector_erase - Erase flash sector
- * @info:	 flash_info structure pointer
- * @sector:	 sector number
- *
- * Set write enable latch with Write Enable command.
- * Returns negative if error occurred.
- */
-static int smi_sector_erase(flash_info_t *info, unsigned int sector)
-{
-	int bank;
-	unsigned int sect_add;
-	unsigned int instruction;
-
-	switch (info->start[0]) {
-	case SMIBANK0_BASE:
-		bank = BANK0;
-		break;
-	case SMIBANK1_BASE:
-		bank = BANK1;
-		break;
-	case SMIBANK2_BASE:
-		bank = BANK2;
-		break;
-	case SMIBANK3_BASE:
-		bank = BANK3;
-		break;
-	default:
-		return -1;
-	}
-
-	sect_add = sector * (info->size / info->sector_count);
-	instruction = ((sect_add >> 8) & 0x0000FF00) | SECTOR_ERASE;
-
-	writel(readl(&smicntl->smi_sr) & ~(ERF1 | ERF2), &smicntl->smi_sr);
-
-	if (info->flash_id == ST_M25Pxx_ID) {
-		/* Wait until finished previous write command. */
-		if (smi_wait_till_ready(bank, CONFIG_SYS_FLASH_ERASE_TOUT))
-			return -EBUSY;
-
-		/* Send write enable, before erase commands. */
-		if (smi_write_enable(bank))
-			return -EIO;
-
-		/* Put SMI in SW mode */
-		writel(readl(&smicntl->smi_cr1) | SW_MODE, &smicntl->smi_cr1);
-
-		/* Send Sector Erase command in SW Mode */
-		writel(instruction, &smicntl->smi_tr);
-		writel((bank << BANKSEL_SHIFT) | SEND | TX_LEN_4,
-		       &smicntl->smi_cr2);
-		smi_wait_xfer_finish(XFER_FINISH_TOUT);
-
-		if (smi_wait_till_ready(bank, CONFIG_SYS_FLASH_ERASE_TOUT))
-			return -EBUSY;
-
-		/* Put SMI in HW mode */
-		writel(readl(&smicntl->smi_cr1) & ~SW_MODE,
-		       &smicntl->smi_cr1);
-
-		return 0;
-	} else {
-		/* Put SMI in HW mode */
-		writel(readl(&smicntl->smi_cr1) & ~SW_MODE,
-		       &smicntl->smi_cr1);
-		return -EINVAL;
-	}
-}
-
-/*
- * smi_write - Write to SMI flash
- * @src_addr:	 source buffer
- * @dst_addr:	 destination buffer
- * @length:	 length to write in words
- * @bank:	 bank base address
- *
- * Write to SMI flash
- */
-static int smi_write(unsigned int *src_addr, unsigned int *dst_addr,
-		     unsigned int length, ulong bank_addr)
-{
-	int banknum;
-
-	switch (bank_addr) {
-	case SMIBANK0_BASE:
-		banknum = BANK0;
-		break;
-	case SMIBANK1_BASE:
-		banknum = BANK1;
-		break;
-	case SMIBANK2_BASE:
-		banknum = BANK2;
-		break;
-	case SMIBANK3_BASE:
-		banknum = BANK3;
-		break;
-	default:
-		return -1;
-	}
-
-	if (smi_wait_till_ready(banknum, CONFIG_SYS_FLASH_WRITE_TOUT))
-		return -EBUSY;
-
-	/* Set SMI in Hardware Mode */
-	writel(readl(&smicntl->smi_cr1) & ~SW_MODE, &smicntl->smi_cr1);
-
-	if (smi_write_enable(banknum))
-		return -EIO;
-
-	/* Perform the write command */
-	while (length--) {
-		if (((ulong) (dst_addr) % SFLASH_PAGE_SIZE) == 0) {
-			if (smi_wait_till_ready(banknum,
-						CONFIG_SYS_FLASH_WRITE_TOUT))
-				return -EBUSY;
-
-			if (smi_write_enable(banknum))
-				return -EIO;
-		}
-
-		*dst_addr++ = *src_addr++;
-
-		if ((readl(&smicntl->smi_sr) & (ERF1 | ERF2)))
-			return -EIO;
-	}
-
-	if (smi_wait_till_ready(banknum, CONFIG_SYS_FLASH_WRITE_TOUT))
-		return -EBUSY;
-
-	writel(readl(&smicntl->smi_sr) & ~(WCF), &smicntl->smi_sr);
-
-	return 0;
-}
-
-/*
- * write_buff - Write to SMI flash
- * @info:	 flash info structure
- * @src:	 source buffer
- * @dest_addr:	 destination buffer
- * @length:	 length to write in words
- *
- * Write to SMI flash
- */
-int write_buff(flash_info_t *info, uchar *src, ulong dest_addr, ulong length)
-{
-	return smi_write((unsigned int *)src, (unsigned int *)dest_addr,
-		  (length + 3) / 4, info->start[0]);
-}
-
-/*
- * flash_init - SMI flash initialization
- *
- * SMI flash initialization
- */
-unsigned long flash_init(void)
-{
-	unsigned long size = 0;
-	int i, j;
-
-	smi_init();
-
-	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
-		flash_info[i].flash_id = FLASH_UNKNOWN;
-		size += flash_info[i].size = flash_get_size(bank_base[i], i);
-	}
-
-	for (j = 0; j < CONFIG_SYS_MAX_FLASH_BANKS; j++) {
-		for (i = 1; i < flash_info[j].sector_count; i++)
-			flash_info[j].start[i] =
-			    flash_info[j].start[i - 1] +
-			    flash_info->size / flash_info->sector_count;
-
-	}
-
-	return size;
-}
-
-/*
- * flash_print_info - Print SMI flash information
- *
- * Print SMI flash information
- */
-void flash_print_info(flash_info_t *info)
-{
-	int i;
-	if (info->flash_id == FLASH_UNKNOWN) {
-		puts("missing or unknown FLASH type\n");
-		return;
-	}
-	printf("  Size: %ld MB in %d Sectors\n",
-	       info->size >> 20, info->sector_count);
-
-	puts("  Sector Start Addresses:");
-	for (i = 0; i < info->sector_count; ++i) {
-#ifdef CONFIG_SYS_FLASH_EMPTY_INFO
-		int size;
-		int erased;
-		u32 *flash;
-
-		/*
-		 * Check if whole sector is erased
-		 */
-		size = (info->size) / (info->sector_count);
-		flash = (u32 *) info->start[i];
-		size = size / sizeof(int);
-
-		while ((size--) && (*flash++ == ~0))
-			;
-
-		size++;
-		if (size)
-			erased = 0;
-		else
-			erased = 1;
-
-		if ((i % 5) == 0)
-			printf("\n");
-
-		printf(" %08lX%s%s",
-		       info->start[i],
-		       erased ? " E" : "  ", info->protect[i] ? "RO " : "   ");
-#else
-		if ((i % 5) == 0)
-			printf("\n   ");
-		printf(" %08lX%s",
-		       info->start[i], info->protect[i] ? " (RO)  " : "     ");
-#endif
-	}
-	putc('\n');
-	return;
-}
-
-/*
- * flash_erase - Erase SMI flash
- *
- * Erase SMI flash
- */
-int flash_erase(flash_info_t *info, int s_first, int s_last)
-{
-	int rcode = 0;
-	int prot = 0;
-	flash_sect_t sect;
-
-	if (info->flash_id != ST_M25Pxx_ID) {
-		puts("Can't erase unknown flash type - aborted\n");
-		return 1;
-	}
-
-	if ((s_first < 0) || (s_first > s_last)) {
-		puts("- no sectors to erase\n");
-		return 1;
-	}
-
-	for (sect = s_first; sect <= s_last; ++sect) {
-		if (info->protect[sect])
-			prot++;
-	}
-	if (prot) {
-		printf("- Warning: %d protected sectors will not be erased!\n",
-		       prot);
-	} else {
-		putc('\n');
-	}
-
-	for (sect = s_first; sect <= s_last; sect++) {
-		if (info->protect[sect] == 0) {
-			if (smi_sector_erase(info, sect))
-				rcode = 1;
-			else
-				putc('.');
-		}
-	}
-	puts(" done\n");
-	return rcode;
-}
-#endif