upstream u-boot with additional patches for our devices/boards:
https://lists.denx.de/pipermail/u-boot/2017-March/282789.html (AXP crashes) ;
Gbit ethernet patch for some LIME2 revisions ;
with SPI flash support
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
330 lines
8.6 KiB
330 lines
8.6 KiB
/*
|
|
* 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 = spi_alloc_slave(struct fsl_spi_slave, bus, cs);
|
|
if (!fsl)
|
|
return NULL;
|
|
|
|
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);
|
|
}
|
|
|