u-boot/drivers/spi/fsl_espi.c
Shaohui Xie 9905757e29 powerpc/espi: remove write command length check
Current espi controller driver assumes the command length of write command is
not equal to '1', it was made based on SPANSION SPI flash, but some SPI flash
driver such as SST does use write command length as '1', so write command on
SST SPI flash will not work. And the length check for write command is not
necessary for SPANSION, though it's harmless for SPANSION, it will stop write
operation on flashes like SST, so we remove the check.

Signed-off-by: Shaohui Xie <Shaohui.Xie@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
2012-10-22 15:52:46 -05:00

332 lines
8.6 KiB
C

/*
* eSPI controller driver.
*
* Copyright 2010-2011 Freescale Semiconductor, Inc.
* Author: Mingkai Hu (Mingkai.hu@freescale.com)
*
* 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 <malloc.h>
#include <spi.h>
#include <asm/immap_85xx.h>
struct fsl_spi_slave {
struct spi_slave slave;
unsigned int div16;
unsigned int pm;
unsigned int mode;
size_t cmd_len;
u8 cmd_buf[16];
size_t data_len;
unsigned int max_transfer_length;
};
#define to_fsl_spi_slave(s) container_of(s, struct fsl_spi_slave, slave)
#define ESPI_MAX_CS_NUM 4
#define ESPI_EV_RNE (1 << 9)
#define ESPI_EV_TNF (1 << 8)
#define ESPI_MODE_EN (1 << 31) /* Enable interface */
#define ESPI_MODE_TXTHR(x) ((x) << 8) /* Tx FIFO threshold */
#define ESPI_MODE_RXTHR(x) ((x) << 0) /* Rx FIFO threshold */
#define ESPI_COM_CS(x) ((x) << 30)
#define ESPI_COM_TRANLEN(x) ((x) << 0)
#define ESPI_CSMODE_CI_INACTIVEHIGH (1 << 31)
#define ESPI_CSMODE_CP_BEGIN_EDGCLK (1 << 30)
#define ESPI_CSMODE_REV_MSB_FIRST (1 << 29)
#define ESPI_CSMODE_DIV16 (1 << 28)
#define ESPI_CSMODE_PM(x) ((x) << 24)
#define ESPI_CSMODE_POL_ASSERTED_LOW (1 << 20)
#define ESPI_CSMODE_LEN(x) ((x) << 16)
#define ESPI_CSMODE_CSBEF(x) ((x) << 12)
#define ESPI_CSMODE_CSAFT(x) ((x) << 8)
#define ESPI_CSMODE_CSCG(x) ((x) << 3)
#define ESPI_CSMODE_INIT_VAL (ESPI_CSMODE_POL_ASSERTED_LOW | \
ESPI_CSMODE_CSBEF(0) | ESPI_CSMODE_CSAFT(0) | \
ESPI_CSMODE_CSCG(1))
#define ESPI_MAX_DATA_TRANSFER_LEN 0xFFF0
struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
unsigned int max_hz, unsigned int mode)
{
struct fsl_spi_slave *fsl;
sys_info_t sysinfo;
unsigned long spibrg = 0;
unsigned char pm = 0;
if (!spi_cs_is_valid(bus, cs))
return NULL;
fsl = malloc(sizeof(struct fsl_spi_slave));
if (!fsl)
return NULL;
fsl->slave.bus = bus;
fsl->slave.cs = cs;
fsl->mode = mode;
fsl->max_transfer_length = ESPI_MAX_DATA_TRANSFER_LEN;
/* Set eSPI BRG clock source */
get_sys_info(&sysinfo);
spibrg = sysinfo.freqSystemBus / 2;
fsl->div16 = 0;
if ((spibrg / max_hz) > 32) {
fsl->div16 = ESPI_CSMODE_DIV16;
pm = spibrg / (max_hz * 16 * 2);
if (pm > 16) {
pm = 16;
debug("Requested speed is too low: %d Hz, %ld Hz "
"is used.\n", max_hz, spibrg / (32 * 16));
}
} else
pm = spibrg / (max_hz * 2);
if (pm)
pm--;
fsl->pm = pm;
return &fsl->slave;
}
void spi_free_slave(struct spi_slave *slave)
{
struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave);
free(fsl);
}
void spi_init(void)
{
}
int spi_claim_bus(struct spi_slave *slave)
{
struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave);
ccsr_espi_t *espi = (void *)(CONFIG_SYS_MPC85xx_ESPI_ADDR);
unsigned char pm = fsl->pm;
unsigned int cs = slave->cs;
unsigned int mode = fsl->mode;
unsigned int div16 = fsl->div16;
int i;
debug("%s: bus:%i cs:%i\n", __func__, slave->bus, cs);
/* Enable eSPI interface */
out_be32(&espi->mode, ESPI_MODE_RXTHR(3)
| ESPI_MODE_TXTHR(4) | ESPI_MODE_EN);
out_be32(&espi->event, 0xffffffff); /* Clear all eSPI events */
out_be32(&espi->mask, 0x00000000); /* Mask all eSPI interrupts */
/* Init CS mode interface */
for (i = 0; i < ESPI_MAX_CS_NUM; i++)
out_be32(&espi->csmode[i], ESPI_CSMODE_INIT_VAL);
out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs]) &
~(ESPI_CSMODE_PM(0xF) | ESPI_CSMODE_DIV16
| ESPI_CSMODE_CI_INACTIVEHIGH | ESPI_CSMODE_CP_BEGIN_EDGCLK
| ESPI_CSMODE_REV_MSB_FIRST | ESPI_CSMODE_LEN(0xF)));
/* Set eSPI BRG clock source */
out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs])
| ESPI_CSMODE_PM(pm) | div16);
/* Set eSPI mode */
if (mode & SPI_CPHA)
out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs])
| ESPI_CSMODE_CP_BEGIN_EDGCLK);
if (mode & SPI_CPOL)
out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs])
| ESPI_CSMODE_CI_INACTIVEHIGH);
/* Character bit order: msb first */
out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs])
| ESPI_CSMODE_REV_MSB_FIRST);
/* Character length in bits, between 0x3~0xf, i.e. 4bits~16bits */
out_be32(&espi->csmode[cs], in_be32(&espi->csmode[cs])
| ESPI_CSMODE_LEN(7));
return 0;
}
void spi_release_bus(struct spi_slave *slave)
{
}
int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *data_out,
void *data_in, unsigned long flags)
{
struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave);
ccsr_espi_t *espi = (void *)(CONFIG_SYS_MPC85xx_ESPI_ADDR);
unsigned int tmpdout, tmpdin, event;
const void *dout = NULL;
void *din = NULL;
int len = 0;
int num_blks, num_chunks, max_tran_len, tran_len;
int num_bytes;
unsigned char *ch;
unsigned char *buffer = NULL;
size_t buf_len;
u8 *cmd_buf = fsl->cmd_buf;
size_t cmd_len = fsl->cmd_len;
size_t data_len = bitlen / 8;
size_t rx_offset = 0;
max_tran_len = fsl->max_transfer_length;
switch (flags) {
case SPI_XFER_BEGIN:
cmd_len = fsl->cmd_len = data_len;
memcpy(cmd_buf, data_out, cmd_len);
return 0;
case 0:
case SPI_XFER_END:
if (bitlen == 0) {
spi_cs_deactivate(slave);
return 0;
}
buf_len = 2 * cmd_len + min(data_len, max_tran_len);
len = cmd_len + data_len;
rx_offset = cmd_len;
buffer = (unsigned char *)malloc(buf_len);
if (!buffer) {
debug("SF: Failed to malloc memory.\n");
return 1;
}
memcpy(buffer, cmd_buf, cmd_len);
if (data_in == NULL)
memcpy(buffer + cmd_len, data_out, data_len);
break;
case SPI_XFER_BEGIN | SPI_XFER_END:
len = data_len;
buffer = (unsigned char *)malloc(len * 2);
if (!buffer) {
debug("SF: Failed to malloc memory.\n");
return 1;
}
memcpy(buffer, data_out, len);
rx_offset = len;
cmd_len = 0;
break;
}
debug("spi_xfer: slave %u:%u dout %08X(%p) din %08X(%p) len %u\n",
slave->bus, slave->cs, *(uint *) dout,
dout, *(uint *) din, din, len);
num_chunks = data_len / max_tran_len +
(data_len % max_tran_len ? 1 : 0);
while (num_chunks--) {
if (data_in)
din = buffer + rx_offset;
dout = buffer;
tran_len = min(data_len , max_tran_len);
num_blks = (tran_len + cmd_len) / 4 +
((tran_len + cmd_len) % 4 ? 1 : 0);
num_bytes = (tran_len + cmd_len) % 4;
fsl->data_len = tran_len + cmd_len;
spi_cs_activate(slave);
/* Clear all eSPI events */
out_be32(&espi->event , 0xffffffff);
/* handle data in 32-bit chunks */
while (num_blks--) {
event = in_be32(&espi->event);
if (event & ESPI_EV_TNF) {
tmpdout = *(u32 *)dout;
/* Set up the next iteration */
if (len > 4) {
len -= 4;
dout += 4;
}
out_be32(&espi->tx, tmpdout);
out_be32(&espi->event, ESPI_EV_TNF);
debug("***spi_xfer:...%08x written\n", tmpdout);
}
/* Wait for eSPI transmit to get out */
udelay(80);
event = in_be32(&espi->event);
if (event & ESPI_EV_RNE) {
tmpdin = in_be32(&espi->rx);
if (num_blks == 0 && num_bytes != 0) {
ch = (unsigned char *)&tmpdin;
while (num_bytes--)
*(unsigned char *)din++ = *ch++;
} else {
*(u32 *) din = tmpdin;
din += 4;
}
out_be32(&espi->event, in_be32(&espi->event)
| ESPI_EV_RNE);
debug("***spi_xfer:...%08x readed\n", tmpdin);
}
}
if (data_in) {
memcpy(data_in, buffer + 2 * cmd_len, tran_len);
if (*buffer == 0x0b) {
data_in += tran_len;
data_len -= tran_len;
*(int *)buffer += tran_len;
}
}
spi_cs_deactivate(slave);
}
free(buffer);
return 0;
}
int spi_cs_is_valid(unsigned int bus, unsigned int cs)
{
return bus == 0 && cs < ESPI_MAX_CS_NUM;
}
void spi_cs_activate(struct spi_slave *slave)
{
struct fsl_spi_slave *fsl = to_fsl_spi_slave(slave);
ccsr_espi_t *espi = (void *)(CONFIG_SYS_MPC85xx_ESPI_ADDR);
unsigned int com = 0;
size_t data_len = fsl->data_len;
com &= ~(ESPI_COM_CS(0x3) | ESPI_COM_TRANLEN(0xFFFF));
com |= ESPI_COM_CS(slave->cs);
com |= ESPI_COM_TRANLEN(data_len - 1);
out_be32(&espi->com, com);
}
void spi_cs_deactivate(struct spi_slave *slave)
{
ccsr_espi_t *espi = (void *)(CONFIG_SYS_MPC85xx_ESPI_ADDR);
/* clear the RXCNT and TXCNT */
out_be32(&espi->mode, in_be32(&espi->mode) & (~ESPI_MODE_EN));
out_be32(&espi->mode, in_be32(&espi->mode) | ESPI_MODE_EN);
}