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sb/intel/spi: Check for the SPI lock bit during runtime 

The SPI swseq controller can be locked in other parts of the code, for
instance when it's locked down in the finalize section. The driver
has to be made aware of that. The simpler solution is to not keep
track of the state and simply read out the lock bit on each SPI
transfer.

Change-Id: Ifcd5121b89d6f80fc1c1368786982d0d9fa1bf61
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33388
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
This commit is contained in:
Arthur Heymans 2019-06-11 11:10:25 +02:00
parent 21c5d43d72
commit 816aaba399
1 changed files with 12 additions and 6 deletions
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18
src/southbridge/intel/common/spi.c
View File

@ -38,8 +38,6 @@
static int spi_is_multichip(void);
static int g_ichspi_lock = 0;
struct ich7_spi_regs {
uint16_t spis;
uint16_t spic;
@ -294,7 +292,6 @@ void spi_init(void)
cntlr->data = (uint8_t *)ich7_spi->spid;
cntlr->databytes = sizeof(ich7_spi->spid);
cntlr->status = (uint8_t *)&ich7_spi->spis;
g_ichspi_lock = readw_(&ich7_spi->spis) & HSFS_FLOCKDN;
cntlr->control = &ich7_spi->spic;
cntlr->bbar = &ich7_spi->bbar;
cntlr->preop = &ich7_spi->preop;
@ -304,7 +301,6 @@ void spi_init(void)
ich9_spi = (struct ich9_spi_regs *)(rcrb + 0x3800);
cntlr->ich9_spi = ich9_spi;
hsfs = readw_(&ich9_spi->hsfs);
g_ichspi_lock = hsfs & HSFS_FLOCKDN;
cntlr->hsfs = hsfs;
cntlr->opmenu = ich9_spi->opmenu;
cntlr->menubytes = sizeof(ich9_spi->opmenu);
@ -336,6 +332,16 @@ void spi_init(void)
pci_write_config8(dev, 0xdc, bios_cntl | 0x1);
}
static int spi_locked(void)
{
struct ich_spi_controller *cntlr = &g_cntlr;
if (CONFIG(SOUTHBRIDGE_INTEL_I82801GX)) {
return !!(readw_(&cntlr->ich7_spi->spis) & HSFS_FLOCKDN);
} else {
return !!(readw_(&cntlr->ich9_spi->hsfs) | HSFS_FLOCKDN);
}
}
static void spi_init_cb(void *unused)
{
spi_init();
@ -407,7 +413,7 @@ static int spi_setup_opcode(spi_transaction *trans)
trans->opcode = trans->out[0];
spi_use_out(trans, 1);
if (!g_ichspi_lock) {
if (!spi_locked()) {
/* The lock is off, so just use index 0. */
writeb_(trans->opcode, cntlr->opmenu);
optypes = readw_(cntlr->optype);
@ -552,7 +558,7 @@ static int spi_ctrlr_xfer(const struct spi_slave *slave, const void *dout,
* in order to prevent the Management Engine from
* issuing a transaction between WREN and DATA.
*/
if (!g_ichspi_lock)
if (!spi_locked())
writew_(trans.opcode, cntlr->preop);
return 0;
}