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Commit 055626ac authored by Thomas Chou's avatar Thomas Chou
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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: default avatarThomas Chou <thomas@wytron.com.tw>
parent 5ff10aa7
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arch/nios2/cpu/Makefile
+ 1
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......@@ -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
arch/nios2/cpu/epcs.c deleted 100644 → 0
+ 0
− 717
View file @ 5ff10aa7
/*
* (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 */
include/nios2-epcs.h deleted 100644 → 0
+ 0
− 60
View file @ 5ff10aa7
/*
* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
* Scott McNutt <smcnutt@psyent.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
/*************************************************************************
* Altera Nios-II EPCS Controller Core interfaces
************************************************************************/
#ifndef __NIOS2_EPCS_H__
#define __NIOS2_EPCS_H__
typedef struct epcs_devinfo_t {
const char *name; /* Device name */
unsigned char id; /* Device silicon id */
unsigned char size; /* Total size log2(bytes)*/
unsigned char num_sects; /* Number of sectors */
unsigned char sz_sect; /* Sector size log2(bytes) */
unsigned char sz_page; /* Page size log2(bytes) */
unsigned char prot_mask; /* Protection mask */
}epcs_devinfo_t;
/* Resets the epcs controller -- to prevent (potential) soft-reset
* problems when booting from the epcs controller
*/
extern int epcs_reset (void);
/* Returns the devinfo struct if EPCS device is found;
* NULL otherwise.
*/
extern epcs_devinfo_t *epcs_dev_find (void);
/* Returns the number of bytes used by config data.
* Negative on error.
*/
extern int epcs_cfgsz (void);
/* Erase sectors 'start' to 'end' - return zero on success
*/
extern int epcs_erase (unsigned start, unsigned end);
/* Read 'cnt' bytes from device offset 'off' into buf at 'addr'
* Zero return on success
*/
extern int epcs_read (ulong addr, ulong off, ulong cnt);
/* Write 'cnt' bytes to device offset 'off' from buf at 'addr'.
* Zero return on success
*/
extern int epcs_write (ulong addr, ulong off, ulong cnt);
/* Verify 'cnt' bytes at device offset 'off' comparing with buf
* at 'addr'. On failure, write first invalid offset to *err.
* Zero return on success
*/
extern int epcs_verify (ulong addr, ulong off, ulong cnt, ulong *err);
#endif /* __NIOS2_EPCS_H__ */
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