linux/drivers/spi/spi-fsl-spi.c

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/*
* Freescale SPI controller driver.
*
* Maintainer: Kumar Gala
*
* Copyright (C) 2006 Polycom, Inc.
* Copyright 2010 Freescale Semiconductor, Inc.
*
* CPM SPI and QE buffer descriptors mode support:
* Copyright (c) 2009 MontaVista Software, Inc.
* Author: Anton Vorontsov <avorontsov@ru.mvista.com>
*
* GRLIB support:
* Copyright (c) 2012 Aeroflex Gaisler AB.
* Author: Andreas Larsson <andreas@gaisler.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.
*/
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/spi/spi.h>
#include <linux/spi/spi_bitbang.h>
#include <linux/platform_device.h>
#include <linux/fsl_devices.h>
#include <linux/dma-mapping.h>
#include <linux/mm.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#include "spi-fsl-lib.h"
#include "spi-fsl-cpm.h"
#include "spi-fsl-spi.h"
#define TYPE_FSL 0
#define TYPE_GRLIB 1
struct fsl_spi_match_data {
int type;
};
static struct fsl_spi_match_data of_fsl_spi_fsl_config = {
.type = TYPE_FSL,
};
static struct fsl_spi_match_data of_fsl_spi_grlib_config = {
.type = TYPE_GRLIB,
};
static struct of_device_id of_fsl_spi_match[] = {
{
.compatible = "fsl,spi",
.data = &of_fsl_spi_fsl_config,
},
{
.compatible = "aeroflexgaisler,spictrl",
.data = &of_fsl_spi_grlib_config,
},
{}
};
MODULE_DEVICE_TABLE(of, of_fsl_spi_match);
static int fsl_spi_get_type(struct device *dev)
{
const struct of_device_id *match;
if (dev->of_node) {
match = of_match_node(of_fsl_spi_match, dev->of_node);
if (match && match->data)
return ((struct fsl_spi_match_data *)match->data)->type;
}
return TYPE_FSL;
}
static void fsl_spi_change_mode(struct spi_device *spi)
{
struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
struct spi_mpc8xxx_cs *cs = spi->controller_state;
struct fsl_spi_reg *reg_base = mspi->reg_base;
__be32 __iomem *mode = &reg_base->mode;
unsigned long flags;
if (cs->hw_mode == mpc8xxx_spi_read_reg(mode))
return;
/* Turn off IRQs locally to minimize time that SPI is disabled. */
local_irq_save(flags);
/* Turn off SPI unit prior changing mode */
mpc8xxx_spi_write_reg(mode, cs->hw_mode & ~SPMODE_ENABLE);
/* When in CPM mode, we need to reinit tx and rx. */
if (mspi->flags & SPI_CPM_MODE) {
fsl_spi_cpm_reinit_txrx(mspi);
}
mpc8xxx_spi_write_reg(mode, cs->hw_mode);
local_irq_restore(flags);
}
static void fsl_spi_chipselect(struct spi_device *spi, int value)
{
struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
struct fsl_spi_platform_data *pdata;
bool pol = spi->mode & SPI_CS_HIGH;
struct spi_mpc8xxx_cs *cs = spi->controller_state;
pdata = spi->dev.parent->parent->platform_data;
if (value == BITBANG_CS_INACTIVE) {
if (pdata->cs_control)
pdata->cs_control(spi, !pol);
}
if (value == BITBANG_CS_ACTIVE) {
mpc8xxx_spi->rx_shift = cs->rx_shift;
mpc8xxx_spi->tx_shift = cs->tx_shift;
mpc8xxx_spi->get_rx = cs->get_rx;
mpc8xxx_spi->get_tx = cs->get_tx;
fsl_spi_change_mode(spi);
if (pdata->cs_control)
pdata->cs_control(spi, pol);
}
}
static void fsl_spi_qe_cpu_set_shifts(u32 *rx_shift, u32 *tx_shift,
int bits_per_word, int msb_first)
{
*rx_shift = 0;
*tx_shift = 0;
if (msb_first) {
if (bits_per_word <= 8) {
*rx_shift = 16;
*tx_shift = 24;
} else if (bits_per_word <= 16) {
*rx_shift = 16;
*tx_shift = 16;
}
} else {
if (bits_per_word <= 8)
*rx_shift = 8;
}
}
static void fsl_spi_grlib_set_shifts(u32 *rx_shift, u32 *tx_shift,
int bits_per_word, int msb_first)
{
*rx_shift = 0;
*tx_shift = 0;
if (bits_per_word <= 16) {
if (msb_first) {
*rx_shift = 16; /* LSB in bit 16 */
*tx_shift = 32 - bits_per_word; /* MSB in bit 31 */
} else {
*rx_shift = 16 - bits_per_word; /* MSB in bit 15 */
}
}
}
static int mspi_apply_cpu_mode_quirks(struct spi_mpc8xxx_cs *cs,
struct spi_device *spi,
struct mpc8xxx_spi *mpc8xxx_spi,
int bits_per_word)
{
cs->rx_shift = 0;
cs->tx_shift = 0;
if (bits_per_word <= 8) {
cs->get_rx = mpc8xxx_spi_rx_buf_u8;
cs->get_tx = mpc8xxx_spi_tx_buf_u8;
} else if (bits_per_word <= 16) {
cs->get_rx = mpc8xxx_spi_rx_buf_u16;
cs->get_tx = mpc8xxx_spi_tx_buf_u16;
} else if (bits_per_word <= 32) {
cs->get_rx = mpc8xxx_spi_rx_buf_u32;
cs->get_tx = mpc8xxx_spi_tx_buf_u32;
} else
return -EINVAL;
if (mpc8xxx_spi->set_shifts)
mpc8xxx_spi->set_shifts(&cs->rx_shift, &cs->tx_shift,
bits_per_word,
!(spi->mode & SPI_LSB_FIRST));
mpc8xxx_spi->rx_shift = cs->rx_shift;
mpc8xxx_spi->tx_shift = cs->tx_shift;
mpc8xxx_spi->get_rx = cs->get_rx;
mpc8xxx_spi->get_tx = cs->get_tx;
return bits_per_word;
}
static int mspi_apply_qe_mode_quirks(struct spi_mpc8xxx_cs *cs,
struct spi_device *spi,
int bits_per_word)
{
/* QE uses Little Endian for words > 8
* so transform all words > 8 into 8 bits
* Unfortnatly that doesn't work for LSB so
* reject these for now */
/* Note: 32 bits word, LSB works iff
* tfcr/rfcr is set to CPMFCR_GBL */
if (spi->mode & SPI_LSB_FIRST &&
bits_per_word > 8)
return -EINVAL;
if (bits_per_word > 8)
return 8; /* pretend its 8 bits */
return bits_per_word;
}
static int fsl_spi_setup_transfer(struct spi_device *spi,
struct spi_transfer *t)
{
struct mpc8xxx_spi *mpc8xxx_spi;
int bits_per_word = 0;
u8 pm;
u32 hz = 0;
struct spi_mpc8xxx_cs *cs = spi->controller_state;
mpc8xxx_spi = spi_master_get_devdata(spi->master);
if (t) {
bits_per_word = t->bits_per_word;
hz = t->speed_hz;
}
/* spi_transfer level calls that work per-word */
if (!bits_per_word)
bits_per_word = spi->bits_per_word;
/* Make sure its a bit width we support [4..16, 32] */
if ((bits_per_word < 4)
|| ((bits_per_word > 16) && (bits_per_word != 32))
|| (bits_per_word > mpc8xxx_spi->max_bits_per_word))
return -EINVAL;
if (!hz)
hz = spi->max_speed_hz;
if (!(mpc8xxx_spi->flags & SPI_CPM_MODE))
bits_per_word = mspi_apply_cpu_mode_quirks(cs, spi,
mpc8xxx_spi,
bits_per_word);
else if (mpc8xxx_spi->flags & SPI_QE)
bits_per_word = mspi_apply_qe_mode_quirks(cs, spi,
bits_per_word);
if (bits_per_word < 0)
return bits_per_word;
if (bits_per_word == 32)
bits_per_word = 0;
else
bits_per_word = bits_per_word - 1;
/* mask out bits we are going to set */
cs->hw_mode &= ~(SPMODE_LEN(0xF) | SPMODE_DIV16
| SPMODE_PM(0xF));
cs->hw_mode |= SPMODE_LEN(bits_per_word);
if ((mpc8xxx_spi->spibrg / hz) > 64) {
cs->hw_mode |= SPMODE_DIV16;
spi: Correct SPI clock frequency setting in spi_mpc8xxx Correct SPI clock frequency division factor rounding, preventing clock rates higher than the maximum specified clock frequency being used. When specifying spi-max-frequency = <10000000> in the device tree, the resulting frequency was 11.1 MHz, with spibrg being 133333332. According to the freescale data sheet [1], the spi clock rate is spiclk = spibrg / (4 * (pm+1)) The existing code calculated pm = mpc8xxx_spi->spibrg / (hz * 4); pm--; resulting in pm = (int) (3.3333) - 1 = 2, resulting in spiclk = 133333332/(4*(2+1)) = 11111111 With the fix, pm = (mpc8xxx_spi->spibrg - 1) / (hz * 4) + 1; pm--; resulting in pm = (int) (4.3333) - 1 = 3, resulting in spiclk = 133333332/(4*(3+1)) = 8333333 Without the fix, for every desired SPI frequency that is not exactly derivable from spibrg, pm will be too small due to rounding down, resulting in a too high SPI clock, so we need a pm which is one higher. For values that are exactly derivable, spibrg will be dividable by (hz*4) without remainder, and (int) ((spibrg-1)/(hz*4)) will be one lower than (int) (spibrg)/(hz*4), which is compensated by adding 1. For these values, the fixed version calculates the same pm as the unfixed version. For all values that are not exactly derivable, spibrg will be not dividable by (hz*4) without remainder, and (int) ((spibrg-1)/(hz*4)) will be the same as (int) (spibrg)/(hz*4), and the calculated pm will be one higher than calculated by the unfixed version. References: [1] http://www.freescale.com/files/32bit/doc/ref_manual/MPC8315ERM.pdf, page 22-10 -> 1398 Signed-off-by: Ernst Schwab <eschwab@online.de> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-02-17 04:02:57 +00:00
pm = (mpc8xxx_spi->spibrg - 1) / (hz * 64) + 1;
WARN_ONCE(pm > 16, "%s: Requested speed is too low: %d Hz. "
"Will use %d Hz instead.\n", dev_name(&spi->dev),
hz, mpc8xxx_spi->spibrg / 1024);
if (pm > 16)
pm = 16;
} else {
spi: Correct SPI clock frequency setting in spi_mpc8xxx Correct SPI clock frequency division factor rounding, preventing clock rates higher than the maximum specified clock frequency being used. When specifying spi-max-frequency = <10000000> in the device tree, the resulting frequency was 11.1 MHz, with spibrg being 133333332. According to the freescale data sheet [1], the spi clock rate is spiclk = spibrg / (4 * (pm+1)) The existing code calculated pm = mpc8xxx_spi->spibrg / (hz * 4); pm--; resulting in pm = (int) (3.3333) - 1 = 2, resulting in spiclk = 133333332/(4*(2+1)) = 11111111 With the fix, pm = (mpc8xxx_spi->spibrg - 1) / (hz * 4) + 1; pm--; resulting in pm = (int) (4.3333) - 1 = 3, resulting in spiclk = 133333332/(4*(3+1)) = 8333333 Without the fix, for every desired SPI frequency that is not exactly derivable from spibrg, pm will be too small due to rounding down, resulting in a too high SPI clock, so we need a pm which is one higher. For values that are exactly derivable, spibrg will be dividable by (hz*4) without remainder, and (int) ((spibrg-1)/(hz*4)) will be one lower than (int) (spibrg)/(hz*4), which is compensated by adding 1. For these values, the fixed version calculates the same pm as the unfixed version. For all values that are not exactly derivable, spibrg will be not dividable by (hz*4) without remainder, and (int) ((spibrg-1)/(hz*4)) will be the same as (int) (spibrg)/(hz*4), and the calculated pm will be one higher than calculated by the unfixed version. References: [1] http://www.freescale.com/files/32bit/doc/ref_manual/MPC8315ERM.pdf, page 22-10 -> 1398 Signed-off-by: Ernst Schwab <eschwab@online.de> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-02-17 04:02:57 +00:00
pm = (mpc8xxx_spi->spibrg - 1) / (hz * 4) + 1;
}
if (pm)
pm--;
cs->hw_mode |= SPMODE_PM(pm);
fsl_spi_change_mode(spi);
return 0;
}
static int fsl_spi_cpu_bufs(struct mpc8xxx_spi *mspi,
struct spi_transfer *t, unsigned int len)
{
u32 word;
struct fsl_spi_reg *reg_base = mspi->reg_base;
mspi->count = len;
/* enable rx ints */
mpc8xxx_spi_write_reg(&reg_base->mask, SPIM_NE);
/* transmit word */
word = mspi->get_tx(mspi);
mpc8xxx_spi_write_reg(&reg_base->transmit, word);
return 0;
}
static int fsl_spi_bufs(struct spi_device *spi, struct spi_transfer *t,
bool is_dma_mapped)
{
struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
struct fsl_spi_reg *reg_base;
unsigned int len = t->len;
u8 bits_per_word;
int ret;
reg_base = mpc8xxx_spi->reg_base;
bits_per_word = spi->bits_per_word;
if (t->bits_per_word)
bits_per_word = t->bits_per_word;
if (bits_per_word > 8) {
/* invalid length? */
if (len & 1)
return -EINVAL;
len /= 2;
}
if (bits_per_word > 16) {
/* invalid length? */
if (len & 1)
return -EINVAL;
len /= 2;
}
mpc8xxx_spi->tx = t->tx_buf;
mpc8xxx_spi->rx = t->rx_buf;
INIT_COMPLETION(mpc8xxx_spi->done);
if (mpc8xxx_spi->flags & SPI_CPM_MODE)
ret = fsl_spi_cpm_bufs(mpc8xxx_spi, t, is_dma_mapped);
else
ret = fsl_spi_cpu_bufs(mpc8xxx_spi, t, len);
if (ret)
return ret;
wait_for_completion(&mpc8xxx_spi->done);
/* disable rx ints */
mpc8xxx_spi_write_reg(&reg_base->mask, 0);
if (mpc8xxx_spi->flags & SPI_CPM_MODE)
fsl_spi_cpm_bufs_complete(mpc8xxx_spi);
return mpc8xxx_spi->count;
}
static void fsl_spi_do_one_msg(struct spi_message *m)
{
struct spi_device *spi = m->spi;
struct spi_transfer *t;
unsigned int cs_change;
const int nsecs = 50;
int status;
cs_change = 1;
status = 0;
list_for_each_entry(t, &m->transfers, transfer_list) {
if (t->bits_per_word || t->speed_hz) {
/* Don't allow changes if CS is active */
status = -EINVAL;
if (cs_change)
status = fsl_spi_setup_transfer(spi, t);
if (status < 0)
break;
}
if (cs_change) {
fsl_spi_chipselect(spi, BITBANG_CS_ACTIVE);
ndelay(nsecs);
}
cs_change = t->cs_change;
if (t->len)
status = fsl_spi_bufs(spi, t, m->is_dma_mapped);
if (status) {
status = -EMSGSIZE;
break;
}
m->actual_length += t->len;
if (t->delay_usecs)
udelay(t->delay_usecs);
if (cs_change) {
ndelay(nsecs);
fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE);
ndelay(nsecs);
}
}
m->status = status;
m->complete(m->context);
if (status || !cs_change) {
ndelay(nsecs);
fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE);
}
fsl_spi_setup_transfer(spi, NULL);
}
static int fsl_spi_setup(struct spi_device *spi)
{
struct mpc8xxx_spi *mpc8xxx_spi;
struct fsl_spi_reg *reg_base;
int retval;
u32 hw_mode;
struct spi_mpc8xxx_cs *cs = spi->controller_state;
if (!spi->max_speed_hz)
return -EINVAL;
if (!cs) {
cs = kzalloc(sizeof *cs, GFP_KERNEL);
if (!cs)
return -ENOMEM;
spi->controller_state = cs;
}
mpc8xxx_spi = spi_master_get_devdata(spi->master);
reg_base = mpc8xxx_spi->reg_base;
hw_mode = cs->hw_mode; /* Save original settings */
cs->hw_mode = mpc8xxx_spi_read_reg(&reg_base->mode);
/* mask out bits we are going to set */
cs->hw_mode &= ~(SPMODE_CP_BEGIN_EDGECLK | SPMODE_CI_INACTIVEHIGH
| SPMODE_REV | SPMODE_LOOP);
if (spi->mode & SPI_CPHA)
cs->hw_mode |= SPMODE_CP_BEGIN_EDGECLK;
if (spi->mode & SPI_CPOL)
cs->hw_mode |= SPMODE_CI_INACTIVEHIGH;
if (!(spi->mode & SPI_LSB_FIRST))
cs->hw_mode |= SPMODE_REV;
if (spi->mode & SPI_LOOP)
cs->hw_mode |= SPMODE_LOOP;
retval = fsl_spi_setup_transfer(spi, NULL);
if (retval < 0) {
cs->hw_mode = hw_mode; /* Restore settings */
return retval;
}
if (mpc8xxx_spi->type == TYPE_GRLIB) {
if (gpio_is_valid(spi->cs_gpio)) {
int desel;
retval = gpio_request(spi->cs_gpio,
dev_name(&spi->dev));
if (retval)
return retval;
desel = !(spi->mode & SPI_CS_HIGH);
retval = gpio_direction_output(spi->cs_gpio, desel);
if (retval) {
gpio_free(spi->cs_gpio);
return retval;
}
} else if (spi->cs_gpio != -ENOENT) {
if (spi->cs_gpio < 0)
return spi->cs_gpio;
return -EINVAL;
}
/* When spi->cs_gpio == -ENOENT, a hole in the phandle list
* indicates to use native chipselect if present, or allow for
* an always selected chip
*/
}
/* Initialize chipselect - might be active for SPI_CS_HIGH mode */
fsl_spi_chipselect(spi, BITBANG_CS_INACTIVE);
return 0;
}
static void fsl_spi_cleanup(struct spi_device *spi)
{
struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
if (mpc8xxx_spi->type == TYPE_GRLIB && gpio_is_valid(spi->cs_gpio))
gpio_free(spi->cs_gpio);
}
static void fsl_spi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
{
struct fsl_spi_reg *reg_base = mspi->reg_base;
/* We need handle RX first */
if (events & SPIE_NE) {
u32 rx_data = mpc8xxx_spi_read_reg(&reg_base->receive);
if (mspi->rx)
mspi->get_rx(rx_data, mspi);
}
if ((events & SPIE_NF) == 0)
/* spin until TX is done */
while (((events =
mpc8xxx_spi_read_reg(&reg_base->event)) &
SPIE_NF) == 0)
spi_mpc83xx: fix checkpatch issues Checkpatch is spitting errors when seeing the rename patch, so fix the errors prior to moving. Following errors and warnings were fixed: WARNING: Use #include <linux/io.h> instead of <asm/io.h> #1027: FILE: drivers/spi/spi_mpc8xxx.c:37: +#include <asm/io.h> ERROR: "foo * bar" should be "foo *bar" #1111: FILE: drivers/spi/spi_mpc8xxx.c:121: +static inline void mpc83xx_spi_write_reg(__be32 __iomem * reg, u32 val) ERROR: "foo * bar" should be "foo *bar" #1116: FILE: drivers/spi/spi_mpc8xxx.c:126: +static inline u32 mpc83xx_spi_read_reg(__be32 __iomem * reg) ERROR: "foo * bar" should be "foo *bar" #1125: FILE: drivers/spi/spi_mpc8xxx.c:135: + type * rx = mpc83xx_spi->rx; \ ERROR: "foo * bar" should be "foo *bar" #1135: FILE: drivers/spi/spi_mpc8xxx.c:145: + const type * tx = mpc83xx_spi->tx; \ WARNING: suspect code indent for conditional statements (16, 25) #1504: FILE: drivers/spi/spi_mpc8xxx.c:514: + while (((event = [...] + cpu_relax(); Following warnings were left over, since fixing them will hurt the readability. We'd better fix them by lowering the indentation level by splitting mpc83xx_spi_work function into two parts. WARNING: line over 80 characters #1371: FILE: drivers/spi/spi_mpc8xxx.c:381: + status = mpc83xx_spi_setup_transfer(spi, t); WARNING: line over 80 characters #1392: FILE: drivers/spi/spi_mpc8xxx.c:402: + mpc83xx_spi_chipselect(spi, BITBANG_CS_INACTIVE); Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Cc: Kumar Gala <galak@gate.crashing.org> Cc: David Brownell <david-b@pacbell.net> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-06-18 23:49:05 +00:00
cpu_relax();
/* Clear the events */
mpc8xxx_spi_write_reg(&reg_base->event, events);
mspi->count -= 1;
if (mspi->count) {
u32 word = mspi->get_tx(mspi);
mpc8xxx_spi_write_reg(&reg_base->transmit, word);
} else {
complete(&mspi->done);
}
}
static irqreturn_t fsl_spi_irq(s32 irq, void *context_data)
{
struct mpc8xxx_spi *mspi = context_data;
irqreturn_t ret = IRQ_NONE;
u32 events;
struct fsl_spi_reg *reg_base = mspi->reg_base;
/* Get interrupt events(tx/rx) */
events = mpc8xxx_spi_read_reg(&reg_base->event);
if (events)
ret = IRQ_HANDLED;
dev_dbg(mspi->dev, "%s: events %x\n", __func__, events);
if (mspi->flags & SPI_CPM_MODE)
fsl_spi_cpm_irq(mspi, events);
else
fsl_spi_cpu_irq(mspi, events);
return ret;
}
static void fsl_spi_remove(struct mpc8xxx_spi *mspi)
{
iounmap(mspi->reg_base);
fsl_spi_cpm_free(mspi);
}
static void fsl_spi_grlib_cs_control(struct spi_device *spi, bool on)
{
struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
struct fsl_spi_reg *reg_base = mpc8xxx_spi->reg_base;
u32 slvsel;
u16 cs = spi->chip_select;
if (gpio_is_valid(spi->cs_gpio)) {
gpio_set_value(spi->cs_gpio, on);
} else if (cs < mpc8xxx_spi->native_chipselects) {
slvsel = mpc8xxx_spi_read_reg(&reg_base->slvsel);
slvsel = on ? (slvsel | (1 << cs)) : (slvsel & ~(1 << cs));
mpc8xxx_spi_write_reg(&reg_base->slvsel, slvsel);
}
}
static void fsl_spi_grlib_probe(struct device *dev)
{
struct fsl_spi_platform_data *pdata = dev->platform_data;
struct spi_master *master = dev_get_drvdata(dev);
struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
struct fsl_spi_reg *reg_base = mpc8xxx_spi->reg_base;
int mbits;
u32 capabilities;
capabilities = mpc8xxx_spi_read_reg(&reg_base->cap);
mpc8xxx_spi->set_shifts = fsl_spi_grlib_set_shifts;
mbits = SPCAP_MAXWLEN(capabilities);
if (mbits)
mpc8xxx_spi->max_bits_per_word = mbits + 1;
mpc8xxx_spi->native_chipselects = 0;
if (SPCAP_SSEN(capabilities)) {
mpc8xxx_spi->native_chipselects = SPCAP_SSSZ(capabilities);
mpc8xxx_spi_write_reg(&reg_base->slvsel, 0xffffffff);
}
master->num_chipselect = mpc8xxx_spi->native_chipselects;
pdata->cs_control = fsl_spi_grlib_cs_control;
}
static struct spi_master * fsl_spi_probe(struct device *dev,
struct resource *mem, unsigned int irq)
{
struct fsl_spi_platform_data *pdata = dev->platform_data;
struct spi_master *master;
struct mpc8xxx_spi *mpc8xxx_spi;
struct fsl_spi_reg *reg_base;
u32 regval;
int ret = 0;
master = spi_alloc_master(dev, sizeof(struct mpc8xxx_spi));
if (master == NULL) {
ret = -ENOMEM;
goto err;
}
dev_set_drvdata(dev, master);
ret = mpc8xxx_spi_probe(dev, mem, irq);
if (ret)
goto err_probe;
master->setup = fsl_spi_setup;
master->cleanup = fsl_spi_cleanup;
mpc8xxx_spi = spi_master_get_devdata(master);
mpc8xxx_spi->spi_do_one_msg = fsl_spi_do_one_msg;
mpc8xxx_spi->spi_remove = fsl_spi_remove;
mpc8xxx_spi->max_bits_per_word = 32;
mpc8xxx_spi->type = fsl_spi_get_type(dev);
ret = fsl_spi_cpm_init(mpc8xxx_spi);
if (ret)
goto err_cpm_init;
mpc8xxx_spi->reg_base = ioremap(mem->start, resource_size(mem));
if (mpc8xxx_spi->reg_base == NULL) {
ret = -ENOMEM;
goto err_ioremap;
}
if (mpc8xxx_spi->type == TYPE_GRLIB)
fsl_spi_grlib_probe(dev);
if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE)
mpc8xxx_spi->set_shifts = fsl_spi_qe_cpu_set_shifts;
if (mpc8xxx_spi->set_shifts)
/* 8 bits per word and MSB first */
mpc8xxx_spi->set_shifts(&mpc8xxx_spi->rx_shift,
&mpc8xxx_spi->tx_shift, 8, 1);
/* Register for SPI Interrupt */
ret = request_irq(mpc8xxx_spi->irq, fsl_spi_irq,
0, "fsl_spi", mpc8xxx_spi);
if (ret != 0)
goto free_irq;
reg_base = mpc8xxx_spi->reg_base;
/* SPI controller initializations */
mpc8xxx_spi_write_reg(&reg_base->mode, 0);
mpc8xxx_spi_write_reg(&reg_base->mask, 0);
mpc8xxx_spi_write_reg(&reg_base->command, 0);
mpc8xxx_spi_write_reg(&reg_base->event, 0xffffffff);
/* Enable SPI interface */
regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE;
if (mpc8xxx_spi->max_bits_per_word < 8) {
regval &= ~SPMODE_LEN(0xF);
regval |= SPMODE_LEN(mpc8xxx_spi->max_bits_per_word - 1);
}
if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE)
regval |= SPMODE_OP;
mpc8xxx_spi_write_reg(&reg_base->mode, regval);
ret = spi_register_master(master);
if (ret < 0)
goto unreg_master;
dev_info(dev, "at 0x%p (irq = %d), %s mode\n", reg_base,
mpc8xxx_spi->irq, mpc8xxx_spi_strmode(mpc8xxx_spi->flags));
return master;
unreg_master:
free_irq(mpc8xxx_spi->irq, mpc8xxx_spi);
free_irq:
iounmap(mpc8xxx_spi->reg_base);
err_ioremap:
fsl_spi_cpm_free(mpc8xxx_spi);
err_cpm_init:
err_probe:
spi_master_put(master);
err:
return ERR_PTR(ret);
}
static void fsl_spi_cs_control(struct spi_device *spi, bool on)
{
struct device *dev = spi->dev.parent->parent;
struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(dev->platform_data);
u16 cs = spi->chip_select;
int gpio = pinfo->gpios[cs];
bool alow = pinfo->alow_flags[cs];
gpio_set_value(gpio, on ^ alow);
}
static int of_fsl_spi_get_chipselects(struct device *dev)
{
struct device_node *np = dev->of_node;
struct fsl_spi_platform_data *pdata = dev->platform_data;
struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata);
int ngpios;
int i = 0;
int ret;
ngpios = of_gpio_count(np);
if (ngpios <= 0) {
/*
* SPI w/o chip-select line. One SPI device is still permitted
* though.
*/
pdata->max_chipselect = 1;
return 0;
}
pinfo->gpios = kmalloc(ngpios * sizeof(*pinfo->gpios), GFP_KERNEL);
if (!pinfo->gpios)
return -ENOMEM;
memset(pinfo->gpios, -1, ngpios * sizeof(*pinfo->gpios));
pinfo->alow_flags = kzalloc(ngpios * sizeof(*pinfo->alow_flags),
GFP_KERNEL);
if (!pinfo->alow_flags) {
ret = -ENOMEM;
goto err_alloc_flags;
}
for (; i < ngpios; i++) {
int gpio;
enum of_gpio_flags flags;
gpio = of_get_gpio_flags(np, i, &flags);
if (!gpio_is_valid(gpio)) {
dev_err(dev, "invalid gpio #%d: %d\n", i, gpio);
ret = gpio;
goto err_loop;
}
ret = gpio_request(gpio, dev_name(dev));
if (ret) {
dev_err(dev, "can't request gpio #%d: %d\n", i, ret);
goto err_loop;
}
pinfo->gpios[i] = gpio;
pinfo->alow_flags[i] = flags & OF_GPIO_ACTIVE_LOW;
ret = gpio_direction_output(pinfo->gpios[i],
pinfo->alow_flags[i]);
if (ret) {
dev_err(dev, "can't set output direction for gpio "
"#%d: %d\n", i, ret);
goto err_loop;
}
}
pdata->max_chipselect = ngpios;
pdata->cs_control = fsl_spi_cs_control;
return 0;
err_loop:
while (i >= 0) {
if (gpio_is_valid(pinfo->gpios[i]))
gpio_free(pinfo->gpios[i]);
i--;
}
kfree(pinfo->alow_flags);
pinfo->alow_flags = NULL;
err_alloc_flags:
kfree(pinfo->gpios);
pinfo->gpios = NULL;
return ret;
}
static int of_fsl_spi_free_chipselects(struct device *dev)
{
struct fsl_spi_platform_data *pdata = dev->platform_data;
struct mpc8xxx_spi_probe_info *pinfo = to_of_pinfo(pdata);
int i;
if (!pinfo->gpios)
return 0;
for (i = 0; i < pdata->max_chipselect; i++) {
if (gpio_is_valid(pinfo->gpios[i]))
gpio_free(pinfo->gpios[i]);
}
kfree(pinfo->gpios);
kfree(pinfo->alow_flags);
return 0;
}
static int of_fsl_spi_probe(struct platform_device *ofdev)
{
struct device *dev = &ofdev->dev;
struct device_node *np = ofdev->dev.of_node;
struct spi_master *master;
struct resource mem;
int irq, type;
int ret = -ENOMEM;
ret = of_mpc8xxx_spi_probe(ofdev);
if (ret)
return ret;
type = fsl_spi_get_type(&ofdev->dev);
if (type == TYPE_FSL) {
ret = of_fsl_spi_get_chipselects(dev);
if (ret)
goto err;
}
ret = of_address_to_resource(np, 0, &mem);
if (ret)
goto err;
irq = irq_of_parse_and_map(np, 0);
if (!irq) {
ret = -EINVAL;
goto err;
}
master = fsl_spi_probe(dev, &mem, irq);
if (IS_ERR(master)) {
ret = PTR_ERR(master);
goto err;
}
return 0;
err:
if (type == TYPE_FSL)
of_fsl_spi_free_chipselects(dev);
return ret;
}
static int of_fsl_spi_remove(struct platform_device *ofdev)
{
struct spi_master *master = dev_get_drvdata(&ofdev->dev);
struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
int ret;
ret = mpc8xxx_spi_remove(&ofdev->dev);
if (ret)
return ret;
if (mpc8xxx_spi->type == TYPE_FSL)
of_fsl_spi_free_chipselects(&ofdev->dev);
return 0;
}
static struct platform_driver of_fsl_spi_driver = {
.driver = {
.name = "fsl_spi",
.owner = THIS_MODULE,
.of_match_table = of_fsl_spi_match,
},
.probe = of_fsl_spi_probe,
.remove = of_fsl_spi_remove,
};
#ifdef CONFIG_MPC832x_RDB
/*
* XXX XXX XXX
* This is "legacy" platform driver, was used by the MPC8323E-RDB boards
* only. The driver should go away soon, since newer MPC8323E-RDB's device
* tree can work with OpenFirmware driver. But for now we support old trees
* as well.
*/
static int plat_mpc8xxx_spi_probe(struct platform_device *pdev)
{
struct resource *mem;
int irq;
struct spi_master *master;
if (!pdev->dev.platform_data)
return -EINVAL;
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!mem)
return -EINVAL;
irq = platform_get_irq(pdev, 0);
if (irq <= 0)
return -EINVAL;
master = fsl_spi_probe(&pdev->dev, mem, irq);
return PTR_RET(master);
}
static int plat_mpc8xxx_spi_remove(struct platform_device *pdev)
{
return mpc8xxx_spi_remove(&pdev->dev);
}
MODULE_ALIAS("platform:mpc8xxx_spi");
static struct platform_driver mpc8xxx_spi_driver = {
.probe = plat_mpc8xxx_spi_probe,
.remove = plat_mpc8xxx_spi_remove,
.driver = {
.name = "mpc8xxx_spi",
.owner = THIS_MODULE,
},
};
static bool legacy_driver_failed;
static void __init legacy_driver_register(void)
{
legacy_driver_failed = platform_driver_register(&mpc8xxx_spi_driver);
}
static void __exit legacy_driver_unregister(void)
{
if (legacy_driver_failed)
return;
platform_driver_unregister(&mpc8xxx_spi_driver);
}
#else
static void __init legacy_driver_register(void) {}
static void __exit legacy_driver_unregister(void) {}
#endif /* CONFIG_MPC832x_RDB */
static int __init fsl_spi_init(void)
{
legacy_driver_register();
return platform_driver_register(&of_fsl_spi_driver);
}
module_init(fsl_spi_init);
static void __exit fsl_spi_exit(void)
{
platform_driver_unregister(&of_fsl_spi_driver);
legacy_driver_unregister();
}
module_exit(fsl_spi_exit);
MODULE_AUTHOR("Kumar Gala");
MODULE_DESCRIPTION("Simple Freescale SPI Driver");
MODULE_LICENSE("GPL");