OMAP3: SPI driver

CC: Ruslan N. Araslanov <byaaka@yandex.ru>
Signed-off-by: Ruslan Araslanov <ruslan.araslanov@vitecmm.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
This commit is contained in:
Dirk Behme 2010-12-11 11:01:00 -05:00 committed by Sandeep Paulraj
parent 3e664f6d50
commit 53736baaff
4 changed files with 472 additions and 0 deletions

View File

@ -35,6 +35,7 @@ COBJS-$(CONFIG_KIRKWOOD_SPI) += kirkwood_spi.o
COBJS-$(CONFIG_MPC52XX_SPI) += mpc52xx_spi.o
COBJS-$(CONFIG_MPC8XXX_SPI) += mpc8xxx_spi.o
COBJS-$(CONFIG_MXC_SPI) += mxc_spi.o
COBJS-$(CONFIG_OMAP3_SPI) += omap3_spi.o
COBJS-$(CONFIG_SOFT_SPI) += soft_spi.o
COBJS := $(COBJS-y)

352
drivers/spi/omap3_spi.c Normal file
View File

@ -0,0 +1,352 @@
/*
* Copyright (C) 2010 Dirk Behme <dirk.behme@googlemail.com>
*
* Driver for McSPI controller on OMAP3. Based on davinci_spi.c
* Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
*
* Copyright (C) 2007 Atmel Corporation
*
* Parts taken from linux/drivers/spi/omap2_mcspi.c
* Copyright (C) 2005, 2006 Nokia Corporation
*
* Modified by Ruslan Araslanov <ruslan.araslanov@vitecmm.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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 <spi.h>
#include <malloc.h>
#include <asm/io.h>
#include "omap3_spi.h"
#define WORD_LEN 8
#define SPI_WAIT_TIMEOUT 3000000;
static void spi_reset(struct omap3_spi_slave *ds)
{
unsigned int tmp;
writel(OMAP3_MCSPI_SYSCONFIG_SOFTRESET, &ds->regs->sysconfig);
do {
tmp = readl(&ds->regs->sysstatus);
} while (!(tmp & OMAP3_MCSPI_SYSSTATUS_RESETDONE));
writel(OMAP3_MCSPI_SYSCONFIG_AUTOIDLE |
OMAP3_MCSPI_SYSCONFIG_ENAWAKEUP |
OMAP3_MCSPI_SYSCONFIG_SMARTIDLE,
&ds->regs->sysconfig);
writel(OMAP3_MCSPI_WAKEUPENABLE_WKEN, &ds->regs->wakeupenable);
}
void spi_init()
{
/* do nothing */
}
struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
unsigned int max_hz, unsigned int mode)
{
struct omap3_spi_slave *ds;
ds = malloc(sizeof(struct omap3_spi_slave));
if (!ds) {
printf("SPI error: malloc of SPI structure failed\n");
return NULL;
}
/*
* OMAP3 McSPI (MultiChannel SPI) has 4 busses (modules)
* with different number of chip selects (CS, channels):
* McSPI1 has 4 CS (bus 0, cs 0 - 3)
* McSPI2 has 2 CS (bus 1, cs 0 - 1)
* McSPI3 has 2 CS (bus 2, cs 0 - 1)
* McSPI4 has 1 CS (bus 3, cs 0)
*/
switch (bus) {
case 0:
ds->regs = (struct mcspi *)OMAP3_MCSPI1_BASE;
break;
case 1:
ds->regs = (struct mcspi *)OMAP3_MCSPI2_BASE;
break;
case 2:
ds->regs = (struct mcspi *)OMAP3_MCSPI3_BASE;
break;
case 3:
ds->regs = (struct mcspi *)OMAP3_MCSPI4_BASE;
break;
default:
printf("SPI error: unsupported bus %i. \
Supported busses 0 - 3\n", bus);
return NULL;
}
ds->slave.bus = bus;
if (((bus == 0) && (cs > 3)) ||
((bus == 1) && (cs > 1)) ||
((bus == 2) && (cs > 1)) ||
((bus == 3) && (cs > 0))) {
printf("SPI error: unsupported chip select %i \
on bus %i\n", cs, bus);
return NULL;
}
ds->slave.cs = cs;
if (max_hz > OMAP3_MCSPI_MAX_FREQ) {
printf("SPI error: unsupported frequency %i Hz. \
Max frequency is 48 Mhz\n", max_hz);
return NULL;
}
ds->freq = max_hz;
if (mode > SPI_MODE_3) {
printf("SPI error: unsupported SPI mode %i\n", mode);
return NULL;
}
ds->mode = mode;
return &ds->slave;
}
void spi_free_slave(struct spi_slave *slave)
{
struct omap3_spi_slave *ds = to_omap3_spi(slave);
free(ds);
}
int spi_claim_bus(struct spi_slave *slave)
{
struct omap3_spi_slave *ds = to_omap3_spi(slave);
unsigned int conf, div = 0;
/* McSPI global module configuration */
/*
* setup when switching from (reset default) slave mode
* to single-channel master mode
*/
spi_reset(ds);
conf = readl(&ds->regs->modulctrl);
conf &= ~(OMAP3_MCSPI_MODULCTRL_STEST | OMAP3_MCSPI_MODULCTRL_MS);
conf |= OMAP3_MCSPI_MODULCTRL_SINGLE;
writel(conf, &ds->regs->modulctrl);
/* McSPI individual channel configuration */
/* Calculate clock divisor. Valid range: 0x0 - 0xC ( /1 - /4096 ) */
if (ds->freq) {
while (div <= 0xC && (OMAP3_MCSPI_MAX_FREQ / (1 << div))
> ds->freq)
div++;
} else
div = 0xC;
conf = readl(&ds->regs->channel[ds->slave.cs].chconf);
/* standard 4-wire master mode: SCK, MOSI/out, MISO/in, nCS
* REVISIT: this controller could support SPI_3WIRE mode.
*/
conf &= ~(OMAP3_MCSPI_CHCONF_IS|OMAP3_MCSPI_CHCONF_DPE1);
conf |= OMAP3_MCSPI_CHCONF_DPE0;
/* wordlength */
conf &= ~OMAP3_MCSPI_CHCONF_WL_MASK;
conf |= (WORD_LEN - 1) << 7;
/* set chipselect polarity; manage with FORCE */
if (!(ds->mode & SPI_CS_HIGH))
conf |= OMAP3_MCSPI_CHCONF_EPOL; /* active-low; normal */
else
conf &= ~OMAP3_MCSPI_CHCONF_EPOL;
/* set clock divisor */
conf &= ~OMAP3_MCSPI_CHCONF_CLKD_MASK;
conf |= div << 2;
/* set SPI mode 0..3 */
if (ds->mode & SPI_CPOL)
conf |= OMAP3_MCSPI_CHCONF_POL;
else
conf &= ~OMAP3_MCSPI_CHCONF_POL;
if (ds->mode & SPI_CPHA)
conf |= OMAP3_MCSPI_CHCONF_PHA;
else
conf &= ~OMAP3_MCSPI_CHCONF_PHA;
/* Transmit & receive mode */
conf &= ~OMAP3_MCSPI_CHCONF_TRM_MASK;
writel(conf, &ds->regs->channel[ds->slave.cs].chconf);
return 0;
}
void spi_release_bus(struct spi_slave *slave)
{
struct omap3_spi_slave *ds = to_omap3_spi(slave);
/* Reset the SPI hardware */
spi_reset(ds);
}
int omap3_spi_write(struct spi_slave *slave, unsigned int len, const u8 *txp,
unsigned long flags)
{
struct omap3_spi_slave *ds = to_omap3_spi(slave);
int i;
int timeout = SPI_WAIT_TIMEOUT;
int chconf = readl(&ds->regs->channel[ds->slave.cs].chconf);
if (flags & SPI_XFER_BEGIN)
writel(OMAP3_MCSPI_CHCTRL_EN,
&ds->regs->channel[ds->slave.cs].chctrl);
chconf &= ~OMAP3_MCSPI_CHCONF_TRM_MASK;
chconf |= OMAP3_MCSPI_CHCONF_TRM_TX_ONLY;
chconf |= OMAP3_MCSPI_CHCONF_FORCE;
writel(chconf, &ds->regs->channel[ds->slave.cs].chconf);
for (i = 0; i < len; i++) {
/* wait till TX register is empty (TXS == 1) */
while (!(readl(&ds->regs->channel[ds->slave.cs].chstat) &
OMAP3_MCSPI_CHSTAT_TXS)) {
if (--timeout <= 0) {
printf("SPI TXS timed out, status=0x%08x\n",
readl(&ds->regs->channel[ds->slave.cs].chstat));
return -1;
}
}
/* Write the data */
writel(txp[i], &ds->regs->channel[ds->slave.cs].tx);
}
if (flags & SPI_XFER_END) {
/* wait to finish of transfer */
while (!(readl(&ds->regs->channel[ds->slave.cs].chstat) &
OMAP3_MCSPI_CHSTAT_EOT));
chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
writel(chconf, &ds->regs->channel[ds->slave.cs].chconf);
writel(0, &ds->regs->channel[ds->slave.cs].chctrl);
}
return 0;
}
int omap3_spi_read(struct spi_slave *slave, unsigned int len, u8 *rxp,
unsigned long flags)
{
struct omap3_spi_slave *ds = to_omap3_spi(slave);
int i;
int timeout = SPI_WAIT_TIMEOUT;
int chconf = readl(&ds->regs->channel[ds->slave.cs].chconf);
if (flags & SPI_XFER_BEGIN)
writel(OMAP3_MCSPI_CHCTRL_EN,
&ds->regs->channel[ds->slave.cs].chctrl);
chconf &= ~OMAP3_MCSPI_CHCONF_TRM_MASK;
chconf |= OMAP3_MCSPI_CHCONF_TRM_RX_ONLY;
chconf |= OMAP3_MCSPI_CHCONF_FORCE;
writel(chconf, &ds->regs->channel[ds->slave.cs].chconf);
writel(0, &ds->regs->channel[ds->slave.cs].tx);
for (i = 0; i < len; i++) {
/* Wait till RX register contains data (RXS == 1) */
while (!(readl(&ds->regs->channel[ds->slave.cs].chstat) &
OMAP3_MCSPI_CHSTAT_RXS)) {
if (--timeout <= 0) {
printf("SPI RXS timed out, status=0x%08x\n",
readl(&ds->regs->channel[ds->slave.cs].chstat));
return -1;
}
}
/* Read the data */
rxp[i] = readl(&ds->regs->channel[ds->slave.cs].rx);
}
if (flags & SPI_XFER_END) {
chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
writel(chconf, &ds->regs->channel[ds->slave.cs].chconf);
writel(0, &ds->regs->channel[ds->slave.cs].chctrl);
}
return 0;
}
int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
const void *dout, void *din, unsigned long flags)
{
struct omap3_spi_slave *ds = to_omap3_spi(slave);
unsigned int len;
const u8 *txp = dout;
u8 *rxp = din;
int ret = -1;
if (bitlen % 8)
return -1;
len = bitlen / 8;
if (bitlen == 0) { /* only change CS */
int chconf = readl(&ds->regs->channel[ds->slave.cs].chconf);
if (flags & SPI_XFER_BEGIN) {
writel(OMAP3_MCSPI_CHCTRL_EN,
&ds->regs->channel[ds->slave.cs].chctrl);
chconf |= OMAP3_MCSPI_CHCONF_FORCE;
writel(chconf,
&ds->regs->channel[ds->slave.cs].chconf);
}
if (flags & SPI_XFER_END) {
chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
writel(chconf,
&ds->regs->channel[ds->slave.cs].chconf);
writel(0, &ds->regs->channel[ds->slave.cs].chctrl);
}
ret = 0;
} else {
if (dout != NULL)
ret = omap3_spi_write(slave, len, txp, flags);
if (din != NULL)
ret = omap3_spi_read(slave, len, rxp, flags);
}
return ret;
}
int spi_cs_is_valid(unsigned int bus, unsigned int cs)
{
return 1;
}
void spi_cs_activate(struct spi_slave *slave)
{
}
void spi_cs_deactivate(struct spi_slave *slave)
{
}

117
drivers/spi/omap3_spi.h Normal file
View File

@ -0,0 +1,117 @@
/*
* Register definitions for the OMAP3 McSPI Controller
*
* Copyright (C) 2010 Dirk Behme <dirk.behme@googlemail.com>
*
* Parts taken from linux/drivers/spi/omap2_mcspi.c
* Copyright (C) 2005, 2006 Nokia Corporation
*
* Modified by Ruslan Araslanov <ruslan.araslanov@vitecmm.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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
*/
#ifndef _OMAP3_SPI_H_
#define _OMAP3_SPI_H_
#define OMAP3_MCSPI1_BASE 0x48098000
#define OMAP3_MCSPI2_BASE 0x4809A000
#define OMAP3_MCSPI3_BASE 0x480B8000
#define OMAP3_MCSPI4_BASE 0x480BA000
#define OMAP3_MCSPI_MAX_FREQ 48000000
/* OMAP3 McSPI registers */
struct mcspi_channel {
unsigned int chconf; /* 0x2C, 0x40, 0x54, 0x68 */
unsigned int chstat; /* 0x30, 0x44, 0x58, 0x6C */
unsigned int chctrl; /* 0x34, 0x48, 0x5C, 0x70 */
unsigned int tx; /* 0x38, 0x4C, 0x60, 0x74 */
unsigned int rx; /* 0x3C, 0x50, 0x64, 0x78 */
};
struct mcspi {
unsigned char res1[0x10];
unsigned int sysconfig; /* 0x10 */
unsigned int sysstatus; /* 0x14 */
unsigned int irqstatus; /* 0x18 */
unsigned int irqenable; /* 0x1C */
unsigned int wakeupenable; /* 0x20 */
unsigned int syst; /* 0x24 */
unsigned int modulctrl; /* 0x28 */
struct mcspi_channel channel[4]; /* channel0: 0x2C - 0x3C, bus 0 & 1 & 2 & 3 */
/* channel1: 0x40 - 0x50, bus 0 & 1 */
/* channel2: 0x54 - 0x64, bus 0 & 1 */
/* channel3: 0x68 - 0x78, bus 0 */
};
/* per-register bitmasks */
#define OMAP3_MCSPI_SYSCONFIG_SMARTIDLE (2 << 3)
#define OMAP3_MCSPI_SYSCONFIG_ENAWAKEUP (1 << 2)
#define OMAP3_MCSPI_SYSCONFIG_AUTOIDLE (1 << 0)
#define OMAP3_MCSPI_SYSCONFIG_SOFTRESET (1 << 1)
#define OMAP3_MCSPI_SYSSTATUS_RESETDONE (1 << 0)
#define OMAP3_MCSPI_MODULCTRL_SINGLE (1 << 0)
#define OMAP3_MCSPI_MODULCTRL_MS (1 << 2)
#define OMAP3_MCSPI_MODULCTRL_STEST (1 << 3)
#define OMAP3_MCSPI_CHCONF_PHA (1 << 0)
#define OMAP3_MCSPI_CHCONF_POL (1 << 1)
#define OMAP3_MCSPI_CHCONF_CLKD_MASK (0x0f << 2)
#define OMAP3_MCSPI_CHCONF_EPOL (1 << 6)
#define OMAP3_MCSPI_CHCONF_WL_MASK (0x1f << 7)
#define OMAP3_MCSPI_CHCONF_TRM_RX_ONLY (0x01 << 12)
#define OMAP3_MCSPI_CHCONF_TRM_TX_ONLY (0x02 << 12)
#define OMAP3_MCSPI_CHCONF_TRM_MASK (0x03 << 12)
#define OMAP3_MCSPI_CHCONF_DMAW (1 << 14)
#define OMAP3_MCSPI_CHCONF_DMAR (1 << 15)
#define OMAP3_MCSPI_CHCONF_DPE0 (1 << 16)
#define OMAP3_MCSPI_CHCONF_DPE1 (1 << 17)
#define OMAP3_MCSPI_CHCONF_IS (1 << 18)
#define OMAP3_MCSPI_CHCONF_TURBO (1 << 19)
#define OMAP3_MCSPI_CHCONF_FORCE (1 << 20)
#define OMAP3_MCSPI_CHSTAT_RXS (1 << 0)
#define OMAP3_MCSPI_CHSTAT_TXS (1 << 1)
#define OMAP3_MCSPI_CHSTAT_EOT (1 << 2)
#define OMAP3_MCSPI_CHCTRL_EN (1 << 0)
#define OMAP3_MCSPI_WAKEUPENABLE_WKEN (1 << 0)
struct omap3_spi_slave {
struct spi_slave slave;
struct mcspi *regs;
unsigned int freq;
unsigned int mode;
};
static inline struct omap3_spi_slave *to_omap3_spi(struct spi_slave *slave)
{
return container_of(slave, struct omap3_spi_slave, slave);
}
int omap3_spi_write(struct spi_slave *slave, unsigned int len, const u8 *txp,
unsigned long flags);
int omap3_spi_read(struct spi_slave *slave, unsigned int len, u8 *rxp,
unsigned long flags);
#endif /* _OMAP3_SPI_H_ */

View File

@ -335,4 +335,6 @@ extern unsigned int boot_flash_type;
CONFIG_SYS_INIT_RAM_SIZE - \
GENERATED_GBL_DATA_SIZE)
#define CONFIG_OMAP3_SPI
#endif /* __CONFIG_H */