/*****************************************************************************
* hermes_cor_reset *
* *
* This is the first step in initializing the card's firmware and hardware: *
* write HERMES_PCI_COR_MASK to the Configuration Option Register *
*****************************************************************************/
int hermes_cor_reset (hermes_t *hw) {
int k;
u16_t reg;
/* Assert the reset until the card notice */
hermes_write_reg (hw, HERMES_PCI_COR, HERMES_PCI_COR_MASK);
milli_delay (HERMES_PCI_COR_ONT);
/* Give time for the card to recover from this hard effort */
hermes_write_reg (hw, HERMES_PCI_COR, 0x0000);
milli_delay (HERMES_PCI_COR_OFFT);
/* The card is ready when it's no longer busy */
k = HERMES_PCI_COR_BUSYT;
reg = hermes_read_reg (hw, HERMES_CMD);
while (k && (reg & HERMES_CMD_BUSY)) {
k--;
milli_delay (1);
reg = hermes_read_reg (hw, HERMES_CMD);
}
/* Did we timeout ? */
if (reg & HERMES_CMD_BUSY) {
printf ("Busy timeout after resetting the COR\n");
return -1;
}
return (0);
}
/* Set up a BAP to read a particular chunk of data from card's internal buffer.
*
* Returns: < 0 on internal failure (errno), 0 on success, >0 on error
* from firmware
*
* Callable from any context */
static int hermes_bap_seek(hermes_t *hw, int bap, u16 id, u16 offset)
{
int sreg = bap ? HERMES_SELECT1 : HERMES_SELECT0;
int oreg = bap ? HERMES_OFFSET1 : HERMES_OFFSET0;
int k;
u16 reg;
/* Paranoia.. */
if ( (offset > HERMES_BAP_OFFSET_MAX) || (offset % 2) )
return -EINVAL;
k = HERMES_BAP_BUSY_TIMEOUT;
reg = hermes_read_reg(hw, oreg);
while ((reg & HERMES_OFFSET_BUSY) && k) {
k--;
udelay(1);
reg = hermes_read_reg(hw, oreg);
}
#ifdef HERMES_DEBUG_BUFFER
hw->profile[HERMES_BAP_BUSY_TIMEOUT - k]++;
if (k < HERMES_BAP_BUSY_TIMEOUT) {
struct hermes_debug_entry *e =
&hw->dbuf[(hw->dbufp++) % HERMES_DEBUG_BUFSIZE];
e->bap = bap;
e->id = id;
e->offset = offset;
e->cycles = HERMES_BAP_BUSY_TIMEOUT - k;
}
#endif
if (reg & HERMES_OFFSET_BUSY)
return -ETIMEDOUT;
/* Now we actually set up the transfer */
hermes_write_reg(hw, sreg, id);
hermes_write_reg(hw, oreg, offset);
/* Wait for the BAP to be ready */
k = HERMES_BAP_BUSY_TIMEOUT;
reg = hermes_read_reg(hw, oreg);
while ( (reg & (HERMES_OFFSET_BUSY | HERMES_OFFSET_ERR)) && k) {
k--;
udelay(1);
reg = hermes_read_reg(hw, oreg);
}
if (reg & HERMES_OFFSET_BUSY) {
return -ETIMEDOUT;
}
if (reg & HERMES_OFFSET_ERR) {
return -EIO;
}
return 0;
}
/* Set up a BAP to read a particular chunk of data from card's internal buffer.
*
* Returns: < 0 on internal failure (errno), 0 on success, >0 on error
* from firmware
*
* Callable from any context */
static int hermes_bap_seek(hermes_t *hw, int bap, u16 id, u16 offset)
{
int sreg = bap ? HERMES_SELECT1 : HERMES_SELECT0;
int oreg = bap ? HERMES_OFFSET1 : HERMES_OFFSET0;
int k;
u16 reg;
/* Paranoia.. */
if ( (offset > HERMES_BAP_OFFSET_MAX) || (offset % 2) )
return -EINVAL;
k = HERMES_BAP_BUSY_TIMEOUT;
reg = hermes_read_reg(hw, oreg);
while ((reg & HERMES_OFFSET_BUSY) && k) {
k--;
udelay(1);
reg = hermes_read_reg(hw, oreg);
}
if (reg & HERMES_OFFSET_BUSY)
return -ETIMEDOUT;
/* Now we actually set up the transfer */
hermes_write_reg(hw, sreg, id);
hermes_write_reg(hw, oreg, offset);
/* Wait for the BAP to be ready */
k = HERMES_BAP_BUSY_TIMEOUT;
reg = hermes_read_reg(hw, oreg);
while ( (reg & (HERMES_OFFSET_BUSY | HERMES_OFFSET_ERR)) && k) {
k--;
udelay(1);
reg = hermes_read_reg(hw, oreg);
}
if (reg != offset) {
printk(KERN_ERR "hermes @ %p: BAP%d offset %s: "
"reg=0x%x id=0x%x offset=0x%x\n", hw->iobase, bap,
(reg & HERMES_OFFSET_BUSY) ? "timeout" : "error",
reg, id, offset);
if (reg & HERMES_OFFSET_BUSY) {
return -ETIMEDOUT;
}
return -EIO; /* error or wrong offset */
}
return 0;
}
static int hermes_bap_seek(struct hermes *hw, int bap, u16 id, u16 offset)
{
int sreg = bap ? HERMES_SELECT1 : HERMES_SELECT0;
int oreg = bap ? HERMES_OFFSET1 : HERMES_OFFSET0;
int k;
u16 reg;
if ((offset > HERMES_BAP_OFFSET_MAX) || (offset % 2))
return -EINVAL;
k = HERMES_BAP_BUSY_TIMEOUT;
reg = hermes_read_reg(hw, oreg);
while ((reg & HERMES_OFFSET_BUSY) && k) {
k--;
udelay(1);
reg = hermes_read_reg(hw, oreg);
}
if (reg & HERMES_OFFSET_BUSY)
return -ETIMEDOUT;
hermes_write_reg(hw, sreg, id);
hermes_write_reg(hw, oreg, offset);
k = HERMES_BAP_BUSY_TIMEOUT;
reg = hermes_read_reg(hw, oreg);
while ((reg & (HERMES_OFFSET_BUSY | HERMES_OFFSET_ERR)) && k) {
k--;
udelay(1);
reg = hermes_read_reg(hw, oreg);
}
if (reg != offset) {
printk(KERN_ERR "hermes @ %p: BAP%d offset %s: "
"reg=0x%x id=0x%x offset=0x%x\n", hw->iobase, bap,
(reg & HERMES_OFFSET_BUSY) ? "timeout" : "error",
reg, id, offset);
if (reg & HERMES_OFFSET_BUSY)
return -ETIMEDOUT;
return -EIO;
}
return 0;
}
/* Set up a BAP to read a particular chunk of data from card's internal buffer.
*
* Returns: < 0 on internal failure (errno), 0 on success, >0 on error
* from firmware
*
* Callable from any context */
int hermes_bap_seek(hermes_t *hw, int bap, u16 id, u16 offset)
{
int sreg = bap ? HERMES_SELECT1 : HERMES_SELECT0;
int oreg = bap ? HERMES_OFFSET1 : HERMES_OFFSET0;
int k;
u16 reg;
/* Paranoia.. */
if ( (offset > HERMES_BAP_OFFSET_MAX) || (offset % 2) )
return -EINVAL;
k = BAP_BUSY_TIMEOUT;
reg = hermes_read_reg(hw, oreg);
while ((reg & HERMES_OFFSET_BUSY) && k) {
k--;
udelay(1);
reg = hermes_read_reg(hw, oreg);
}
if (reg & HERMES_OFFSET_BUSY)
return -ETIMEDOUT;
/* Now we actually set up the transfer */
hermes_write_reg(hw, sreg, id);
hermes_write_reg(hw, oreg, offset);
/* Wait for the BAP to be ready */
k = BAP_BUSY_TIMEOUT;
reg = hermes_read_reg(hw, oreg);
while ( (reg & (HERMES_OFFSET_BUSY | HERMES_OFFSET_ERR)) && k) {
k--;
udelay(1);
reg = hermes_read_reg(hw, oreg);
}
if (reg & HERMES_OFFSET_BUSY) {
DEBUG(1,"hermes_bap_seek: timeout\n");
return -ETIMEDOUT;
}
if (reg & HERMES_OFFSET_ERR) {
DEBUG(1,"hermes_bap_seek: BAP error\n");
return -EIO;
}
return 0;
}
/* Read a Length-Type-Value record from the card.
*
* If length is NULL, we ignore the length read from the card, and
* read the entire buffer regardless. This is useful because some of
* the configuration records appear to have incorrect lengths in
* practice.
*
* Callable from user or bh context. */
int hermes_read_ltv(hermes_t *hw, int bap, u16 rid, unsigned bufsize,
u16 *length, void *buf)
{
int err = 0;
int dreg = bap ? HERMES_DATA1 : HERMES_DATA0;
u16 rlength, rtype;
unsigned nwords;
if ( (bufsize < 0) || (bufsize % 2) )
return -EINVAL;
err = hermes_docmd_wait(hw, HERMES_CMD_ACCESS, rid, NULL);
if (err)
return err;
err = hermes_bap_seek(hw, bap, rid, 0);
if (err)
return err;
rlength = hermes_read_reg(hw, dreg);
if (! rlength)
return -ENOENT;
rtype = hermes_read_reg(hw, dreg);
if (length)
*length = rlength;
if (rtype != rid)
printk(KERN_WARNING "hermes @ %s0x%lx: "
"hermes_read_ltv(): rid (0x%04x) does not match type (0x%04x)\n",
IO_TYPE(hw), hw->iobase, rid, rtype);
if (HERMES_RECLEN_TO_BYTES(rlength) > bufsize)
printk(KERN_WARNING "hermes @ %s0x%lx: "
"Truncating LTV record from %d to %d bytes. "
"(rid=0x%04x, len=0x%04x)\n",
IO_TYPE(hw), hw->iobase,
HERMES_RECLEN_TO_BYTES(rlength), bufsize, rid, rlength);
nwords = min((unsigned)rlength - 1, bufsize / 2);
hermes_read_words(hw, dreg, buf, nwords);
return 0;
}
/* Read a Length-Type-Value record from the card.
*
* If length is NULL, we ignore the length read from the card, and
* read the entire buffer regardless. This is useful because some of
* the configuration records appear to have incorrect lengths in
* practice.
*
* Callable from user or bh context. */
int hermes_read_ltv(hermes_t *hw, int bap, u16 rid, int bufsize,
u16 *length, void *buf)
{
int err = 0;
int dreg = bap ? HERMES_DATA1 : HERMES_DATA0;
u16 rlength, rtype;
hermes_response_t resp;
if (bufsize % 2)
return -EINVAL;
err = hermes_docmd_wait(hw, HERMES_CMD_ACCESS, rid, &resp);
if (err)
goto out;
err = hermes_bap_seek(hw, bap, rid, 0);
if (err)
goto out;
rlength = hermes_read_reg(hw, dreg);
rtype = hermes_read_reg(hw, dreg);
if (length)
*length = rlength;
if (rtype != rid)
printk(KERN_WARNING "hermes_read_ltv(): rid (0x%04x) does "
"not match type (0x%04x)\n", rid, rtype);
if (HERMES_RECLEN_TO_BYTES(rlength) > bufsize)
printk(KERN_WARNING "hermes @ 0x%x: Truncating LTV record from %d to %d bytes. "
"(rid=0x%04x, len=0x%04x)\n", hw->iobase,
HERMES_RECLEN_TO_BYTES(rlength), bufsize, rid, rlength);
/* FIXME: we should read the min of the requested length and
the actual record length */
hermes_read_words(hw, dreg, buf, bufsize / 2);
out:
return err;
}
/*****************************************************************************
* hermes_issue_cmd *
* *
* Issue a command to the chip. Waiting for it to complete is the caller's *
* problem. The only thing we have to do first is to see whether we can *
* actually write something in the CMD register: is it unbusy? *
* Returns -EBUSY if the command register is busy, 0 on success. *
*****************************************************************************/
static int hermes_issue_cmd (hermes_t * hw, u16_t cmd, u16_t param0) {
int k = HERMES_CMD_BUSY_TIMEOUT;
u16_t reg;
/* First wait for the command register to unbusy */
reg = hermes_read_reg (hw, HERMES_CMD);
while ((reg & HERMES_CMD_BUSY) && k) {
k--;
micro_delay (1);
reg = hermes_read_reg (hw, HERMES_CMD);
}
/* it takes too long. Bailing out */
if (reg & HERMES_CMD_BUSY) {
printf("Hermes: HERMES_CMD_BUSY timeout\n");
return -EBUSY;
}
/* write the values to the right registers */
hermes_write_reg (hw, HERMES_PARAM2, 0);
hermes_write_reg (hw, HERMES_PARAM1, 0);
hermes_write_reg (hw, HERMES_PARAM0, param0);
hermes_write_reg (hw, HERMES_CMD, cmd);
return 0;
}
/*****************************************************************************
* hermes_init *
* *
* Initialize the card *
*****************************************************************************/
int hermes_init (hermes_t * hw)
{
u32_t status, reg, resp0;
int err = 0;
int k;
/* We don't want to be interrupted while resetting the chipset. By
* setting the control mask for hardware interrupt generation to 0,
* we won't be disturbed*/
hw->inten = 0x0;
hermes_write_reg (hw, HERMES_INTEN, 0);
/* Acknowledge any pending events waiting for acknowledgement. We
* assume there won't be any important to take care off */
hermes_write_reg (hw, HERMES_EVACK, 0xffff);
/* Normally it's a "can't happen" for the command register to
* be busy when we go to issue a command because we are
* serializing all commands. However we want to have some
* chance of resetting the card even if it gets into a stupid
* state, so we actually wait to see if the command register
* will unbusy itself here. */
k = HERMES_CMD_BUSY_TIMEOUT;
reg = hermes_read_reg (hw, HERMES_CMD);
while (k && (reg & HERMES_CMD_BUSY)) {
if (reg == 0xffff) {
/* Special case - the card has probably
* been removed, so don't wait for the
* timeout */
printf("Hermes: Card removed?\n");
return -ENODEV;
}
k--;
micro_delay (1);
reg = hermes_read_reg (hw, HERMES_CMD);
}
/* No need to explicitly handle the timeout - if we've timed
* out hermes_issue_cmd() will probably return -EBUSY below.
* But i check to be sure :-) */
if (reg & HERMES_CMD_BUSY) {
printf("Hermes: Timeout waiting for the CMD_BUSY to unset\n");
return -EBUSY;
}
/* According to the documentation, EVSTAT may contain
* obsolete event occurrence information. We have to acknowledge
* it by writing EVACK. */
reg = hermes_read_reg (hw, HERMES_EVSTAT);
hermes_write_reg (hw, HERMES_EVACK, reg);
err = hermes_issue_cmd (hw, HERMES_CMD_INIT, 0);
if (err){
printf("Hermes: errornr: 0x%x issueing HERMES_CMD_INIT\n",
err);
return err;
}
/* here we start waiting for the above command,CMD_INIT, to complete.
* Completion is noticeable when the HERMES_EV_CMD bit in the
* HERMES_EVSTAT register is set to 1 */
reg = hermes_read_reg (hw, HERMES_EVSTAT);
k = HERMES_CMD_INIT_TIMEOUT;
while ((!(reg & HERMES_EV_CMD)) && k) {
k--;
micro_delay (10);
reg = hermes_read_reg (hw, HERMES_EVSTAT);
}
/* the software support register 0 (there are 3) is filled with a
* magic number. With this one can test the availability of the card */
hermes_write_reg (hw, HERMES_SWSUPPORT0, HERMES_MAGIC);
if (!hermes_present (hw)) {
printf("Hermes: Card not present?: got mag. nr.0x%x\n",
hermes_read_reg (hw, HERMES_SWSUPPORT0));
}
if (!(reg & HERMES_EV_CMD)) {
printf("hermes @ %x: Timeout waiting for card to reset\n",
hw->iobase);
return -ETIMEDOUT;
}
status = hermes_read_reg (hw, HERMES_STATUS);
resp0 = hermes_read_reg (hw, HERMES_RESP0);
/* after having issued the command above, the completion set a bit in
* the EVSTAT register. This has to be acknowledged, as follows */
hermes_write_reg (hw, HERMES_EVACK, HERMES_EV_CMD);
/* Was the status, the result of the issued command, ok? */
/* The expression below should be zero. Non-zero means an error */
if (status & HERMES_STATUS_RESULT) {
printf("Hermes:Result of INIT_CMD wrong.error value: 0x%x\n",
(status & HERMES_STATUS_RESULT) >> 8);
err = -EIO;
}
/*****************************************************************************
* hermes_present *
* *
* Check whether we have access to the card. Does the SWSUPPORT0 contain the *
* value we put in it earlier? *
*****************************************************************************/
PRIVATE int hermes_present (hermes_t * hw) {
int i = hermes_read_reg (hw, HERMES_SWSUPPORT0) == HERMES_MAGIC;
if (!i)
printf("Hermes: Error, card not present?\n");
return i;
}