nios2: remove EPCS driver

The Altera EPCS is SPI flash. We have been using SPI flash driver
to access EPCS for years. The old EPCS driver could be removed.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>

2 files changed, 1 insertions, 718 deletions

diff --git a/arch/nios2/cpu/Makefile b/arch/nios2/cpu/Makefile
index bdd983d3f1..3fe7847160 100644
--- a/arch/nios2/cpu/Makefile
+++ b/arch/nios2/cpu/Makefile
@@ -7,5 +7,5 @@
 
 extra-y	= start.o
 obj-y	= exceptions.o
-obj-y	+= cpu.o interrupts.o sysid.o traps.o epcs.o
+obj-y	+= cpu.o interrupts.o sysid.o traps.o
 obj-y	+= fdt.o
diff --git a/arch/nios2/cpu/epcs.c b/arch/nios2/cpu/epcs.c
deleted file mode 100644
index 9758552447..0000000000
--- a/arch/nios2/cpu/epcs.c
+++ /dev/null
@@ -1,717 +0,0 @@
-/*
- * (C) Copyright 2004, Psyent Corporation <www.psyent.com>
- * Scott McNutt <smcnutt@psyent.com>
- *
- * SPDX-License-Identifier:	GPL-2.0+
- */
-
-#include <common.h>
-
-#if defined(CONFIG_SYS_NIOS_EPCSBASE)
-#include <command.h>
-#include <asm/io.h>
-#include <nios2-io.h>
-#include <nios2-epcs.h>
-
-
-/*-----------------------------------------------------------------------*/
-#define SHORT_HELP\
-	"epcs    - read/write Cyclone EPCS configuration device.\n"
-
-#define LONG_HELP\
-	"\n"\
-	"epcs erase start [end]\n"\
-	"    - erase sector start or sectors start through end.\n"\
-	"epcs info\n"\
-	"    - display EPCS device information.\n"\
-	"epcs protect on | off\n"\
-	"    - turn device protection on or off.\n"\
-	"epcs read addr offset count\n"\
-	"    - read count bytes from offset to addr.\n"\
-	"epcs write addr offset count\n"\
-	"    - write count bytes to offset from addr.\n"\
-	"epcs verify addr offset count\n"\
-	"    - verify count bytes at offset from addr."
-
-
-/*-----------------------------------------------------------------------*/
-/* Operation codes for serial configuration devices
- */
-#define EPCS_WRITE_ENA		0x06	/* Write enable */
-#define EPCS_WRITE_DIS		0x04	/* Write disable */
-#define EPCS_READ_STAT		0x05	/* Read status */
-#define EPCS_READ_BYTES		0x03	/* Read bytes */
-#define EPCS_READ_ID		0xab	/* Read silicon id */
-#define EPCS_WRITE_STAT		0x01	/* Write status */
-#define EPCS_WRITE_BYTES	0x02	/* Write bytes */
-#define EPCS_ERASE_BULK		0xc7	/* Erase entire device */
-#define EPCS_ERASE_SECT		0xd8	/* Erase sector */
-
-/* Device status register bits
- */
-#define EPCS_STATUS_WIP		(1<<0)	/* Write in progress */
-#define EPCS_STATUS_WEL		(1<<1)	/* Write enable latch */
-
-/* Misc
- */
-#define EPCS_TIMEOUT		100	/* 100 msec timeout */
-
-static nios_spi_t *epcs = (nios_spi_t *)CONFIG_SYS_NIOS_EPCSBASE;
-
-/***********************************************************************
- * Device access
- ***********************************************************************/
-static int epcs_cs (int assert)
-{
-	ulong start;
-	unsigned tmp;
-
-
-	if (assert) {
-		tmp = readl (&epcs->control);
-		writel (tmp | NIOS_SPI_SSO, &epcs->control);
-	} else {
-		/* Let all bits shift out */
-		start = get_timer (0);
-		while ((readl (&epcs->status) & NIOS_SPI_TMT) == 0)
-			if (get_timer (start) > EPCS_TIMEOUT)
-				return (-1);
-		tmp = readl (&epcs->control);
-		writel (tmp & ~NIOS_SPI_SSO, &epcs->control);
-	}
-	return (0);
-}
-
-static int epcs_tx (unsigned char c)
-{
-	ulong start;
-
-	start = get_timer (0);
-	while ((readl (&epcs->status) & NIOS_SPI_TRDY) == 0)
-		if (get_timer (start) > EPCS_TIMEOUT)
-			return (-1);
-	writel (c, &epcs->txdata);
-	return (0);
-}
-
-static int epcs_rx (void)
-{
-	ulong start;
-
-	start = get_timer (0);
-	while ((readl (&epcs->status) & NIOS_SPI_RRDY) == 0)
-		if (get_timer (start) > EPCS_TIMEOUT)
-			return (-1);
-	return (readl (&epcs->rxdata));
-}
-
-static unsigned char bitrev[] = {
-	0x00, 0x08, 0x04, 0x0c, 0x02, 0x0a, 0x06, 0x0e,
-	0x01, 0x09, 0x05, 0x0d, 0x03, 0x0b, 0x07, 0x0f
-};
-
-static unsigned char epcs_bitrev (unsigned char c)
-{
-	unsigned char val;
-
-	val  = bitrev[c>>4];
-	val |= bitrev[c & 0x0f]<<4;
-	return (val);
-}
-
-static void epcs_rcv (unsigned char *dst, int len)
-{
-	while (len--) {
-		epcs_tx (0);
-		*dst++ = epcs_rx ();
-	}
-}
-
-static void epcs_rrcv (unsigned char *dst, int len)
-{
-	while (len--) {
-		epcs_tx (0);
-		*dst++ = epcs_bitrev (epcs_rx ());
-	}
-}
-
-static void epcs_snd (unsigned char *src, int len)
-{
-	while (len--) {
-		epcs_tx (*src++);
-		epcs_rx ();
-	}
-}
-
-static void epcs_rsnd (unsigned char *src, int len)
-{
-	while (len--) {
-		epcs_tx (epcs_bitrev (*src++));
-		epcs_rx ();
-	}
-}
-
-static void epcs_wr_enable (void)
-{
-	epcs_cs (1);
-	epcs_tx (EPCS_WRITE_ENA);
-	epcs_rx ();
-	epcs_cs (0);
-}
-
-static unsigned char epcs_status_rd (void)
-{
-	unsigned char status;
-
-	epcs_cs (1);
-	epcs_tx (EPCS_READ_STAT);
-	epcs_rx ();
-	epcs_tx (0);
-	status = epcs_rx ();
-	epcs_cs (0);
-	return (status);
-}
-
-static void epcs_status_wr (unsigned char status)
-{
-	epcs_wr_enable ();
-	epcs_cs (1);
-	epcs_tx (EPCS_WRITE_STAT);
-	epcs_rx ();
-	epcs_tx (status);
-	epcs_rx ();
-	epcs_cs (0);
-	return;
-}
-
-/***********************************************************************
- * Device information
- ***********************************************************************/
-
-static struct epcs_devinfo_t devinfo[] = {
-	{ "EPCS1 ", 0x10, 17, 4, 15, 8, 0x0c },
-	{ "EPCS4 ", 0x12, 19, 8, 16, 8, 0x1c },
-	{ "EPCS16", 0x14, 21, 32, 16, 8, 0x1c },
-	{ "EPCS64", 0x16, 23,128, 16, 8, 0x1c },
-	{ 0, 0, 0, 0, 0, 0 }
-};
-
-int epcs_reset (void)
-{
-	/* When booting from an epcs controller, the epcs bootrom
-	 * code may leave the slave select in an asserted state.
-	 * This causes two problems: (1) The initial epcs access
-	 * will fail -- not a big deal, and (2) a software reset
-	 * will cause the bootrom code to hang since it does not
-	 * ensure the select is negated prior to first access -- a
-	 * big deal. Here we just negate chip select and everything
-	 * gets better :-)
-	 */
-	epcs_cs (0); /* Negate chip select */
-	return (0);
-}
-
-epcs_devinfo_t *epcs_dev_find (void)
-{
-	unsigned char buf[4];
-	unsigned char id;
-	int i;
-	struct epcs_devinfo_t *dev = NULL;
-
-	/* Read silicon id requires 3 "dummy bytes" before it's put
-	 * on the wire.
-	 */
-	buf[0] = EPCS_READ_ID;
-	buf[1] = 0;
-	buf[2] = 0;
-	buf[3] = 0;
-
-	epcs_cs (1);
-	epcs_snd (buf,4);
-	epcs_rcv (buf,1);
-	if (epcs_cs (0) == -1)
-		return (NULL);
-	id = buf[0];
-
-	/* Find the info struct */
-	i = 0;
-	while (devinfo[i].name) {
-		if (id == devinfo[i].id) {
-			dev = &devinfo[i];
-			break;
-		}
-		i++;
-	}
-
-	return (dev);
-}
-
-/***********************************************************************
- * Misc Utilities
- ***********************************************************************/
-int epcs_cfgsz (void)
-{
-	int sz = 0;
-	unsigned char buf[128];
-	unsigned char *p;
-	struct epcs_devinfo_t *dev = epcs_dev_find ();
-
-	if (!dev)
-		return (-1);
-
-	/* Read in the first 128 bytes of the device */
-	buf[0] = EPCS_READ_BYTES;
-	buf[1] = 0;
-	buf[2] = 0;
-	buf[3] = 0;
-
-	epcs_cs (1);
-	epcs_snd (buf,4);
-	epcs_rrcv (buf, sizeof(buf));
-	epcs_cs (0);
-
-	/* Search for the starting 0x6a which is followed by the
-	 * 4-byte 'register' and 4-byte bit-count.
-	 */
-	p = buf;
-	while (p < buf + sizeof(buf)-8) {
-		if ( *p == 0x6a ) {
-			/* Point to bit count and extract */
-			p += 5;
-			sz = *p++;
-			sz |= *p++ << 8;
-			sz |= *p++ << 16;
-			sz |= *p++ << 24;
-			/* Convert to byte count */
-			sz += 7;
-			sz >>= 3;
-		} else if (*p == 0xff) {
-			/* 0xff is ok ... just skip */
-			p++;
-			continue;
-		} else {
-			/* Not 0xff or 0x6a ... something's not
-			 * right ... report 'unknown' (sz=0).
-			 */
-			break;
-		}
-	}
-	return (sz);
-}
-
-int epcs_erase (unsigned start, unsigned end)
-{
-	unsigned off, sectsz;
-	unsigned char buf[4];
-	struct epcs_devinfo_t *dev = epcs_dev_find ();
-
-	if (!dev || (start>end))
-		return (-1);
-
-	/* Erase the requested sectors. An address is required
-	 * that lies within the requested sector -- we'll just
-	 * use the first address in the sector.
-	 */
-	printf ("epcs erasing sector %d ", start);
-	if (start != end)
-		printf ("to %d ", end);
-	sectsz = (1 << dev->sz_sect);
-	while (start <= end) {
-		off = start * sectsz;
-		start++;
-
-		buf[0] = EPCS_ERASE_SECT;
-		buf[1] = off >> 16;
-		buf[2] = off >> 8;
-		buf[3] = off;
-
-		epcs_wr_enable ();
-		epcs_cs (1);
-		epcs_snd (buf,4);
-		epcs_cs (0);
-
-		printf ("."); /* Some user feedback */
-
-		/* Wait for erase to complete */
-		while (epcs_status_rd() & EPCS_STATUS_WIP)
-			;
-	}
-	printf (" done.\n");
-	return (0);
-}
-
-int epcs_read (ulong addr, ulong off, ulong cnt)
-{
-	unsigned char buf[4];
-	struct epcs_devinfo_t *dev = epcs_dev_find ();
-
-	if (!dev)
-		return (-1);
-
-	buf[0] = EPCS_READ_BYTES;
-	buf[1] = off >> 16;
-	buf[2] = off >> 8;
-	buf[3] = off;
-
-	epcs_cs (1);
-	epcs_snd (buf,4);
-	epcs_rrcv ((unsigned char *)addr, cnt);
-	epcs_cs (0);
-
-	return (0);
-}
-
-int epcs_write (ulong addr, ulong off, ulong cnt)
-{
-	ulong wrcnt;
-	unsigned pgsz;
-	unsigned char buf[4];
-	struct epcs_devinfo_t *dev = epcs_dev_find ();
-
-	if (!dev)
-		return (-1);
-
-	pgsz = (1<<dev->sz_page);
-	while (cnt) {
-		if (off % pgsz)
-			wrcnt = pgsz - (off % pgsz);
-		else
-			wrcnt = pgsz;
-		wrcnt = (wrcnt > cnt) ? cnt : wrcnt;
-
-		buf[0] = EPCS_WRITE_BYTES;
-		buf[1] = off >> 16;
-		buf[2] = off >> 8;
-		buf[3] = off;
-
-		epcs_wr_enable ();
-		epcs_cs (1);
-		epcs_snd (buf,4);
-		epcs_rsnd ((unsigned char *)addr, wrcnt);
-		epcs_cs (0);
-
-		/* Wait for write to complete */
-		while (epcs_status_rd() & EPCS_STATUS_WIP)
-			;
-
-		cnt -= wrcnt;
-		off += wrcnt;
-		addr += wrcnt;
-	}
-
-	return (0);
-}
-
-int epcs_verify (ulong addr, ulong off, ulong cnt, ulong *err)
-{
-	ulong rdcnt;
-	unsigned char buf[256];
-	unsigned char *start,*end;
-	int i;
-
-	start = end = (unsigned char *)addr;
-	while (cnt) {
-		rdcnt = (cnt>sizeof(buf)) ? sizeof(buf) : cnt;
-		epcs_read ((ulong)buf, off, rdcnt);
-		for (i=0; i<rdcnt; i++) {
-			if (*end != buf[i]) {
-				*err = end - start;
-				return(-1);
-			}
-			end++;
-		}
-		cnt -= rdcnt;
-		off += rdcnt;
-	}
-	return (0);
-}
-
-static int epcs_sect_erased (int sect, unsigned *offset,
-		struct epcs_devinfo_t *dev)
-{
-	unsigned char buf[128];
-	unsigned off, end;
-	unsigned sectsz;
-	int i;
-
-	sectsz = (1 << dev->sz_sect);
-	off = sectsz * sect;
-	end = off + sectsz;
-
-	while (off < end) {
-		epcs_read ((ulong)buf, off, sizeof(buf));
-		for (i=0; i < sizeof(buf); i++) {
-			if (buf[i] != 0xff) {
-				*offset = off + i;
-				return (0);
-			}
-		}
-		off += sizeof(buf);
-	}
-	return (1);
-}
-
-
-/***********************************************************************
- * Commands
- ***********************************************************************/
-static
-void do_epcs_info (struct epcs_devinfo_t *dev, int argc, char * const argv[])
-{
-	int i;
-	unsigned char stat;
-	unsigned tmp;
-	int erased;
-
-	/* Basic device info */
-	printf ("%s: %d kbytes (%d sectors x %d kbytes,"
-		" %d bytes/page)\n",
-		dev->name, 1 << (dev->size-10),
-		dev->num_sects, 1 << (dev->sz_sect-10),
-		1 << dev->sz_page );
-
-	/* Status -- for now protection is all-or-nothing */
-	stat = epcs_status_rd();
-	printf ("status: 0x%02x (WIP:%d, WEL:%d, PROT:%s)\n",
-		stat,
-		(stat & EPCS_STATUS_WIP) ? 1 : 0,
-		(stat & EPCS_STATUS_WEL) ? 1 : 0,
-		(stat & dev->prot_mask) ? "on" : "off" );
-
-	/* Configuration  */
-	tmp = epcs_cfgsz ();
-	if (tmp) {
-		printf ("config: 0x%06x (%d) bytes\n", tmp, tmp );
-	} else {
-		printf ("config: unknown\n" );
-	}
-
-	/* Sector info */
-	for (i=0; (i < dev->num_sects) && (argc > 1); i++) {
-		erased = epcs_sect_erased (i, &tmp, dev);
-		if ((i & 0x03) == 0) printf ("\n");
-		printf ("%4d: %07x ",
-			i, i*(1<<dev->sz_sect) );
-		if (erased)
-			printf ("E ");
-		else
-			printf ("  ");
-	}
-	printf ("\n");
-
-	return;
-}
-
-static
-void do_epcs_erase (struct epcs_devinfo_t *dev, int argc, char * const argv[])
-{
-	unsigned start,end;
-
-	if ((argc < 3) || (argc > 4)) {
-		printf ("USAGE: epcs erase sect [end]\n");
-		return;
-	}
-	if ((epcs_status_rd() & dev->prot_mask) != 0) {
-		printf ( "epcs: device protected.\n");
-		return;
-	}
-
-	start = simple_strtoul (argv[2], NULL, 10);
-	if (argc > 3)
-		end = simple_strtoul (argv[3], NULL, 10);
-	else
-		end = start;
-	if ((start >= dev->num_sects) || (start > end)) {
-		printf ("epcs: invalid sector range: [%d:%d]\n",
-			start, end );
-		return;
-	}
-
-	epcs_erase (start, end);
-
-	return;
-}
-
-static
-void do_epcs_protect (struct epcs_devinfo_t *dev, int argc, char * const argv[])
-{
-	unsigned char stat;
-
-	/* For now protection is all-or-nothing to keep things
-	 * simple. The protection bits don't map in a linear
-	 * fashion ... and we would rather protect the bottom
-	 * of the device since it contains the config data and
-	 * leave the top unprotected for app use. But unfortunately
-	 * protection works from top-to-bottom so it does
-	 * really help very much from a software app point-of-view.
-	 */
-	if (argc < 3) {
-		printf ("USAGE: epcs protect on | off\n");
-		return;
-	}
-	if (!dev)
-		return;
-
-	/* Protection on/off is just a matter of setting/clearing
-	 * all protection bits in the status register.
-	 */
-	stat = epcs_status_rd ();
-	if (strcmp ("on", argv[2]) == 0) {
-		stat |= dev->prot_mask;
-	} else if (strcmp ("off", argv[2]) == 0 ) {
-		stat &= ~dev->prot_mask;
-	} else {
-		printf ("epcs: unknown protection: %s\n", argv[2]);
-		return;
-	}
-	epcs_status_wr (stat);
-	return;
-}
-
-static
-void do_epcs_read (struct epcs_devinfo_t *dev, int argc, char * const argv[])
-{
-	ulong addr,off,cnt;
-	ulong sz;
-
-	if (argc < 5) {
-		printf ("USAGE: epcs read addr offset count\n");
-		return;
-	}
-
-	sz = 1 << dev->size;
-	addr = simple_strtoul (argv[2], NULL, 16);
-	off  = simple_strtoul (argv[3], NULL, 16);
-	cnt  = simple_strtoul (argv[4], NULL, 16);
-	if (off > sz) {
-		printf ("offset is greater than device size"
-			"... aborting.\n");
-		return;
-	}
-	if ((off + cnt) > sz) {
-		printf ("request exceeds device size"
-			"... truncating.\n");
-		cnt = sz - off;
-	}
-	printf ("epcs: read %08lx <- %06lx (0x%lx bytes)\n",
-			addr, off, cnt);
-	epcs_read (addr, off, cnt);
-
-	return;
-}
-
-static
-void do_epcs_write (struct epcs_devinfo_t *dev, int argc, char * const argv[])
-{
-	ulong addr,off,cnt;
-	ulong sz;
-	ulong err;
-
-	if (argc < 5) {
-		printf ("USAGE: epcs write addr offset count\n");
-		return;
-	}
-	if ((epcs_status_rd() & dev->prot_mask) != 0) {
-		printf ( "epcs: device protected.\n");
-		return;
-	}
-
-	sz = 1 << dev->size;
-	addr = simple_strtoul (argv[2], NULL, 16);
-	off  = simple_strtoul (argv[3], NULL, 16);
-	cnt  = simple_strtoul (argv[4], NULL, 16);
-	if (off > sz) {
-		printf ("offset is greater than device size"
-			"... aborting.\n");
-		return;
-	}
-	if ((off + cnt) > sz) {
-		printf ("request exceeds device size"
-			"... truncating.\n");
-		cnt = sz - off;
-	}
-	printf ("epcs: write %08lx -> %06lx (0x%lx bytes)\n",
-			addr, off, cnt);
-	epcs_write (addr, off, cnt);
-	if (epcs_verify (addr, off, cnt, &err) != 0)
-		printf ("epcs: write error at offset %06lx\n", err);
-
-	return;
-}
-
-static
-void do_epcs_verify (struct epcs_devinfo_t *dev, int argc, char * const argv[])
-{
-	ulong addr,off,cnt;
-	ulong sz;
-	ulong err;
-
-	if (argc < 5) {
-		printf ("USAGE: epcs verify addr offset count\n");
-		return;
-	}
-
-	sz = 1 << dev->size;
-	addr = simple_strtoul (argv[2], NULL, 16);
-	off  = simple_strtoul (argv[3], NULL, 16);
-	cnt  = simple_strtoul (argv[4], NULL, 16);
-	if (off > sz) {
-		printf ("offset is greater than device size"
-			"... aborting.\n");
-		return;
-	}
-	if ((off + cnt) > sz) {
-		printf ("request exceeds device size"
-			"... truncating.\n");
-		cnt = sz - off;
-	}
-	printf ("epcs: verify %08lx -> %06lx (0x%lx bytes)\n",
-			addr, off, cnt);
-	if (epcs_verify (addr, off, cnt, &err) != 0)
-		printf ("epcs: verify error at offset %06lx\n", err);
-
-	return;
-}
-
-/*-----------------------------------------------------------------------*/
-int do_epcs (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
-{
-	int len;
-	struct epcs_devinfo_t *dev = epcs_dev_find ();
-
-	if (!dev) {
-		printf ("epcs: device not found.\n");
-		return (-1);
-	}
-
-	if (argc < 2) {
-		do_epcs_info (dev, argc, argv);
-		return (0);
-	}
-
-	len = strlen (argv[1]);
-	if (strncmp ("info", argv[1], len) == 0) {
-		do_epcs_info (dev, argc, argv);
-	} else if (strncmp ("erase", argv[1], len) == 0) {
-		do_epcs_erase (dev, argc, argv);
-	} else if (strncmp ("protect", argv[1], len) == 0) {
-		do_epcs_protect (dev, argc, argv);
-	} else if (strncmp ("read", argv[1], len) == 0) {
-		do_epcs_read (dev, argc, argv);
-	} else if (strncmp ("write", argv[1], len) == 0) {
-		do_epcs_write (dev, argc, argv);
-	} else if (strncmp ("verify", argv[1], len) == 0) {
-		do_epcs_verify (dev, argc, argv);
-	} else {
-		printf ("epcs: unknown operation: %s\n", argv[1]);
-	}
-
-	return (0);
-}
-
-/*-----------------------------------------------------------------------*/
-
-
-U_BOOT_CMD( epcs, 5, 0, do_epcs, SHORT_HELP, LONG_HELP );
-
-#endif /* CONFIG_NIOS_EPCS */