![Govindraj.R](/assets/img/avatar_default.png)
fixes below compilation warning. The variable doesn't actual ever get used uninitialized, but that's no reason to be sloppy. drivers/spi/omap2_mcspi.c: In function 'omap2_mcspi_txrx_dma': drivers/spi/omap2_mcspi.c:301: warning: 'elements' may be used uninitialized in this function Signed-off-by: Govindraj.R <govindraj.raja@ti.com> [grant.likely: amended description] Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
1294 lines
32 KiB
C
1294 lines
32 KiB
C
/*
|
||
* OMAP2 McSPI controller driver
|
||
*
|
||
* Copyright (C) 2005, 2006 Nokia Corporation
|
||
* Author: Samuel Ortiz <samuel.ortiz@nokia.com> and
|
||
* Juha Yrj<72>l<EFBFBD> <juha.yrjola@nokia.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 <linux/kernel.h>
|
||
#include <linux/init.h>
|
||
#include <linux/interrupt.h>
|
||
#include <linux/module.h>
|
||
#include <linux/device.h>
|
||
#include <linux/delay.h>
|
||
#include <linux/dma-mapping.h>
|
||
#include <linux/platform_device.h>
|
||
#include <linux/err.h>
|
||
#include <linux/clk.h>
|
||
#include <linux/io.h>
|
||
#include <linux/slab.h>
|
||
#include <linux/pm_runtime.h>
|
||
|
||
#include <linux/spi/spi.h>
|
||
|
||
#include <plat/dma.h>
|
||
#include <plat/clock.h>
|
||
#include <plat/mcspi.h>
|
||
|
||
#define OMAP2_MCSPI_MAX_FREQ 48000000
|
||
|
||
/* OMAP2 has 3 SPI controllers, while OMAP3 has 4 */
|
||
#define OMAP2_MCSPI_MAX_CTRL 4
|
||
|
||
#define OMAP2_MCSPI_REVISION 0x00
|
||
#define OMAP2_MCSPI_SYSSTATUS 0x14
|
||
#define OMAP2_MCSPI_IRQSTATUS 0x18
|
||
#define OMAP2_MCSPI_IRQENABLE 0x1c
|
||
#define OMAP2_MCSPI_WAKEUPENABLE 0x20
|
||
#define OMAP2_MCSPI_SYST 0x24
|
||
#define OMAP2_MCSPI_MODULCTRL 0x28
|
||
|
||
/* per-channel banks, 0x14 bytes each, first is: */
|
||
#define OMAP2_MCSPI_CHCONF0 0x2c
|
||
#define OMAP2_MCSPI_CHSTAT0 0x30
|
||
#define OMAP2_MCSPI_CHCTRL0 0x34
|
||
#define OMAP2_MCSPI_TX0 0x38
|
||
#define OMAP2_MCSPI_RX0 0x3c
|
||
|
||
/* per-register bitmasks: */
|
||
|
||
#define OMAP2_MCSPI_MODULCTRL_SINGLE BIT(0)
|
||
#define OMAP2_MCSPI_MODULCTRL_MS BIT(2)
|
||
#define OMAP2_MCSPI_MODULCTRL_STEST BIT(3)
|
||
|
||
#define OMAP2_MCSPI_CHCONF_PHA BIT(0)
|
||
#define OMAP2_MCSPI_CHCONF_POL BIT(1)
|
||
#define OMAP2_MCSPI_CHCONF_CLKD_MASK (0x0f << 2)
|
||
#define OMAP2_MCSPI_CHCONF_EPOL BIT(6)
|
||
#define OMAP2_MCSPI_CHCONF_WL_MASK (0x1f << 7)
|
||
#define OMAP2_MCSPI_CHCONF_TRM_RX_ONLY BIT(12)
|
||
#define OMAP2_MCSPI_CHCONF_TRM_TX_ONLY BIT(13)
|
||
#define OMAP2_MCSPI_CHCONF_TRM_MASK (0x03 << 12)
|
||
#define OMAP2_MCSPI_CHCONF_DMAW BIT(14)
|
||
#define OMAP2_MCSPI_CHCONF_DMAR BIT(15)
|
||
#define OMAP2_MCSPI_CHCONF_DPE0 BIT(16)
|
||
#define OMAP2_MCSPI_CHCONF_DPE1 BIT(17)
|
||
#define OMAP2_MCSPI_CHCONF_IS BIT(18)
|
||
#define OMAP2_MCSPI_CHCONF_TURBO BIT(19)
|
||
#define OMAP2_MCSPI_CHCONF_FORCE BIT(20)
|
||
|
||
#define OMAP2_MCSPI_CHSTAT_RXS BIT(0)
|
||
#define OMAP2_MCSPI_CHSTAT_TXS BIT(1)
|
||
#define OMAP2_MCSPI_CHSTAT_EOT BIT(2)
|
||
|
||
#define OMAP2_MCSPI_CHCTRL_EN BIT(0)
|
||
|
||
#define OMAP2_MCSPI_WAKEUPENABLE_WKEN BIT(0)
|
||
|
||
/* We have 2 DMA channels per CS, one for RX and one for TX */
|
||
struct omap2_mcspi_dma {
|
||
int dma_tx_channel;
|
||
int dma_rx_channel;
|
||
|
||
int dma_tx_sync_dev;
|
||
int dma_rx_sync_dev;
|
||
|
||
struct completion dma_tx_completion;
|
||
struct completion dma_rx_completion;
|
||
};
|
||
|
||
/* use PIO for small transfers, avoiding DMA setup/teardown overhead and
|
||
* cache operations; better heuristics consider wordsize and bitrate.
|
||
*/
|
||
#define DMA_MIN_BYTES 160
|
||
|
||
|
||
struct omap2_mcspi {
|
||
struct work_struct work;
|
||
/* lock protects queue and registers */
|
||
spinlock_t lock;
|
||
struct list_head msg_queue;
|
||
struct spi_master *master;
|
||
/* Virtual base address of the controller */
|
||
void __iomem *base;
|
||
unsigned long phys;
|
||
/* SPI1 has 4 channels, while SPI2 has 2 */
|
||
struct omap2_mcspi_dma *dma_channels;
|
||
struct device *dev;
|
||
};
|
||
|
||
struct omap2_mcspi_cs {
|
||
void __iomem *base;
|
||
unsigned long phys;
|
||
int word_len;
|
||
struct list_head node;
|
||
/* Context save and restore shadow register */
|
||
u32 chconf0;
|
||
};
|
||
|
||
/* used for context save and restore, structure members to be updated whenever
|
||
* corresponding registers are modified.
|
||
*/
|
||
struct omap2_mcspi_regs {
|
||
u32 modulctrl;
|
||
u32 wakeupenable;
|
||
struct list_head cs;
|
||
};
|
||
|
||
static struct omap2_mcspi_regs omap2_mcspi_ctx[OMAP2_MCSPI_MAX_CTRL];
|
||
|
||
static struct workqueue_struct *omap2_mcspi_wq;
|
||
|
||
#define MOD_REG_BIT(val, mask, set) do { \
|
||
if (set) \
|
||
val |= mask; \
|
||
else \
|
||
val &= ~mask; \
|
||
} while (0)
|
||
|
||
static inline void mcspi_write_reg(struct spi_master *master,
|
||
int idx, u32 val)
|
||
{
|
||
struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
|
||
|
||
__raw_writel(val, mcspi->base + idx);
|
||
}
|
||
|
||
static inline u32 mcspi_read_reg(struct spi_master *master, int idx)
|
||
{
|
||
struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
|
||
|
||
return __raw_readl(mcspi->base + idx);
|
||
}
|
||
|
||
static inline void mcspi_write_cs_reg(const struct spi_device *spi,
|
||
int idx, u32 val)
|
||
{
|
||
struct omap2_mcspi_cs *cs = spi->controller_state;
|
||
|
||
__raw_writel(val, cs->base + idx);
|
||
}
|
||
|
||
static inline u32 mcspi_read_cs_reg(const struct spi_device *spi, int idx)
|
||
{
|
||
struct omap2_mcspi_cs *cs = spi->controller_state;
|
||
|
||
return __raw_readl(cs->base + idx);
|
||
}
|
||
|
||
static inline u32 mcspi_cached_chconf0(const struct spi_device *spi)
|
||
{
|
||
struct omap2_mcspi_cs *cs = spi->controller_state;
|
||
|
||
return cs->chconf0;
|
||
}
|
||
|
||
static inline void mcspi_write_chconf0(const struct spi_device *spi, u32 val)
|
||
{
|
||
struct omap2_mcspi_cs *cs = spi->controller_state;
|
||
|
||
cs->chconf0 = val;
|
||
mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCONF0, val);
|
||
mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCONF0);
|
||
}
|
||
|
||
static void omap2_mcspi_set_dma_req(const struct spi_device *spi,
|
||
int is_read, int enable)
|
||
{
|
||
u32 l, rw;
|
||
|
||
l = mcspi_cached_chconf0(spi);
|
||
|
||
if (is_read) /* 1 is read, 0 write */
|
||
rw = OMAP2_MCSPI_CHCONF_DMAR;
|
||
else
|
||
rw = OMAP2_MCSPI_CHCONF_DMAW;
|
||
|
||
MOD_REG_BIT(l, rw, enable);
|
||
mcspi_write_chconf0(spi, l);
|
||
}
|
||
|
||
static void omap2_mcspi_set_enable(const struct spi_device *spi, int enable)
|
||
{
|
||
u32 l;
|
||
|
||
l = enable ? OMAP2_MCSPI_CHCTRL_EN : 0;
|
||
mcspi_write_cs_reg(spi, OMAP2_MCSPI_CHCTRL0, l);
|
||
/* Flash post-writes */
|
||
mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCTRL0);
|
||
}
|
||
|
||
static void omap2_mcspi_force_cs(struct spi_device *spi, int cs_active)
|
||
{
|
||
u32 l;
|
||
|
||
l = mcspi_cached_chconf0(spi);
|
||
MOD_REG_BIT(l, OMAP2_MCSPI_CHCONF_FORCE, cs_active);
|
||
mcspi_write_chconf0(spi, l);
|
||
}
|
||
|
||
static void omap2_mcspi_set_master_mode(struct spi_master *master)
|
||
{
|
||
u32 l;
|
||
|
||
/* setup when switching from (reset default) slave mode
|
||
* to single-channel master mode
|
||
*/
|
||
l = mcspi_read_reg(master, OMAP2_MCSPI_MODULCTRL);
|
||
MOD_REG_BIT(l, OMAP2_MCSPI_MODULCTRL_STEST, 0);
|
||
MOD_REG_BIT(l, OMAP2_MCSPI_MODULCTRL_MS, 0);
|
||
MOD_REG_BIT(l, OMAP2_MCSPI_MODULCTRL_SINGLE, 1);
|
||
mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, l);
|
||
|
||
omap2_mcspi_ctx[master->bus_num - 1].modulctrl = l;
|
||
}
|
||
|
||
static void omap2_mcspi_restore_ctx(struct omap2_mcspi *mcspi)
|
||
{
|
||
struct spi_master *spi_cntrl;
|
||
struct omap2_mcspi_cs *cs;
|
||
spi_cntrl = mcspi->master;
|
||
|
||
/* McSPI: context restore */
|
||
mcspi_write_reg(spi_cntrl, OMAP2_MCSPI_MODULCTRL,
|
||
omap2_mcspi_ctx[spi_cntrl->bus_num - 1].modulctrl);
|
||
|
||
mcspi_write_reg(spi_cntrl, OMAP2_MCSPI_WAKEUPENABLE,
|
||
omap2_mcspi_ctx[spi_cntrl->bus_num - 1].wakeupenable);
|
||
|
||
list_for_each_entry(cs, &omap2_mcspi_ctx[spi_cntrl->bus_num - 1].cs,
|
||
node)
|
||
__raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0);
|
||
}
|
||
static void omap2_mcspi_disable_clocks(struct omap2_mcspi *mcspi)
|
||
{
|
||
pm_runtime_put_sync(mcspi->dev);
|
||
}
|
||
|
||
static int omap2_mcspi_enable_clocks(struct omap2_mcspi *mcspi)
|
||
{
|
||
return pm_runtime_get_sync(mcspi->dev);
|
||
}
|
||
|
||
static int mcspi_wait_for_reg_bit(void __iomem *reg, unsigned long bit)
|
||
{
|
||
unsigned long timeout;
|
||
|
||
timeout = jiffies + msecs_to_jiffies(1000);
|
||
while (!(__raw_readl(reg) & bit)) {
|
||
if (time_after(jiffies, timeout))
|
||
return -1;
|
||
cpu_relax();
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
static unsigned
|
||
omap2_mcspi_txrx_dma(struct spi_device *spi, struct spi_transfer *xfer)
|
||
{
|
||
struct omap2_mcspi *mcspi;
|
||
struct omap2_mcspi_cs *cs = spi->controller_state;
|
||
struct omap2_mcspi_dma *mcspi_dma;
|
||
unsigned int count, c;
|
||
unsigned long base, tx_reg, rx_reg;
|
||
int word_len, data_type, element_count;
|
||
int elements = 0;
|
||
u32 l;
|
||
u8 * rx;
|
||
const u8 * tx;
|
||
void __iomem *chstat_reg;
|
||
|
||
mcspi = spi_master_get_devdata(spi->master);
|
||
mcspi_dma = &mcspi->dma_channels[spi->chip_select];
|
||
l = mcspi_cached_chconf0(spi);
|
||
|
||
chstat_reg = cs->base + OMAP2_MCSPI_CHSTAT0;
|
||
|
||
count = xfer->len;
|
||
c = count;
|
||
word_len = cs->word_len;
|
||
|
||
base = cs->phys;
|
||
tx_reg = base + OMAP2_MCSPI_TX0;
|
||
rx_reg = base + OMAP2_MCSPI_RX0;
|
||
rx = xfer->rx_buf;
|
||
tx = xfer->tx_buf;
|
||
|
||
if (word_len <= 8) {
|
||
data_type = OMAP_DMA_DATA_TYPE_S8;
|
||
element_count = count;
|
||
} else if (word_len <= 16) {
|
||
data_type = OMAP_DMA_DATA_TYPE_S16;
|
||
element_count = count >> 1;
|
||
} else /* word_len <= 32 */ {
|
||
data_type = OMAP_DMA_DATA_TYPE_S32;
|
||
element_count = count >> 2;
|
||
}
|
||
|
||
if (tx != NULL) {
|
||
omap_set_dma_transfer_params(mcspi_dma->dma_tx_channel,
|
||
data_type, element_count, 1,
|
||
OMAP_DMA_SYNC_ELEMENT,
|
||
mcspi_dma->dma_tx_sync_dev, 0);
|
||
|
||
omap_set_dma_dest_params(mcspi_dma->dma_tx_channel, 0,
|
||
OMAP_DMA_AMODE_CONSTANT,
|
||
tx_reg, 0, 0);
|
||
|
||
omap_set_dma_src_params(mcspi_dma->dma_tx_channel, 0,
|
||
OMAP_DMA_AMODE_POST_INC,
|
||
xfer->tx_dma, 0, 0);
|
||
}
|
||
|
||
if (rx != NULL) {
|
||
elements = element_count - 1;
|
||
if (l & OMAP2_MCSPI_CHCONF_TURBO)
|
||
elements--;
|
||
|
||
omap_set_dma_transfer_params(mcspi_dma->dma_rx_channel,
|
||
data_type, elements, 1,
|
||
OMAP_DMA_SYNC_ELEMENT,
|
||
mcspi_dma->dma_rx_sync_dev, 1);
|
||
|
||
omap_set_dma_src_params(mcspi_dma->dma_rx_channel, 0,
|
||
OMAP_DMA_AMODE_CONSTANT,
|
||
rx_reg, 0, 0);
|
||
|
||
omap_set_dma_dest_params(mcspi_dma->dma_rx_channel, 0,
|
||
OMAP_DMA_AMODE_POST_INC,
|
||
xfer->rx_dma, 0, 0);
|
||
}
|
||
|
||
if (tx != NULL) {
|
||
omap_start_dma(mcspi_dma->dma_tx_channel);
|
||
omap2_mcspi_set_dma_req(spi, 0, 1);
|
||
}
|
||
|
||
if (rx != NULL) {
|
||
omap_start_dma(mcspi_dma->dma_rx_channel);
|
||
omap2_mcspi_set_dma_req(spi, 1, 1);
|
||
}
|
||
|
||
if (tx != NULL) {
|
||
wait_for_completion(&mcspi_dma->dma_tx_completion);
|
||
dma_unmap_single(&spi->dev, xfer->tx_dma, count, DMA_TO_DEVICE);
|
||
|
||
/* for TX_ONLY mode, be sure all words have shifted out */
|
||
if (rx == NULL) {
|
||
if (mcspi_wait_for_reg_bit(chstat_reg,
|
||
OMAP2_MCSPI_CHSTAT_TXS) < 0)
|
||
dev_err(&spi->dev, "TXS timed out\n");
|
||
else if (mcspi_wait_for_reg_bit(chstat_reg,
|
||
OMAP2_MCSPI_CHSTAT_EOT) < 0)
|
||
dev_err(&spi->dev, "EOT timed out\n");
|
||
}
|
||
}
|
||
|
||
if (rx != NULL) {
|
||
wait_for_completion(&mcspi_dma->dma_rx_completion);
|
||
dma_unmap_single(&spi->dev, xfer->rx_dma, count, DMA_FROM_DEVICE);
|
||
omap2_mcspi_set_enable(spi, 0);
|
||
|
||
if (l & OMAP2_MCSPI_CHCONF_TURBO) {
|
||
|
||
if (likely(mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHSTAT0)
|
||
& OMAP2_MCSPI_CHSTAT_RXS)) {
|
||
u32 w;
|
||
|
||
w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0);
|
||
if (word_len <= 8)
|
||
((u8 *)xfer->rx_buf)[elements++] = w;
|
||
else if (word_len <= 16)
|
||
((u16 *)xfer->rx_buf)[elements++] = w;
|
||
else /* word_len <= 32 */
|
||
((u32 *)xfer->rx_buf)[elements++] = w;
|
||
} else {
|
||
dev_err(&spi->dev,
|
||
"DMA RX penultimate word empty");
|
||
count -= (word_len <= 8) ? 2 :
|
||
(word_len <= 16) ? 4 :
|
||
/* word_len <= 32 */ 8;
|
||
omap2_mcspi_set_enable(spi, 1);
|
||
return count;
|
||
}
|
||
}
|
||
|
||
if (likely(mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHSTAT0)
|
||
& OMAP2_MCSPI_CHSTAT_RXS)) {
|
||
u32 w;
|
||
|
||
w = mcspi_read_cs_reg(spi, OMAP2_MCSPI_RX0);
|
||
if (word_len <= 8)
|
||
((u8 *)xfer->rx_buf)[elements] = w;
|
||
else if (word_len <= 16)
|
||
((u16 *)xfer->rx_buf)[elements] = w;
|
||
else /* word_len <= 32 */
|
||
((u32 *)xfer->rx_buf)[elements] = w;
|
||
} else {
|
||
dev_err(&spi->dev, "DMA RX last word empty");
|
||
count -= (word_len <= 8) ? 1 :
|
||
(word_len <= 16) ? 2 :
|
||
/* word_len <= 32 */ 4;
|
||
}
|
||
omap2_mcspi_set_enable(spi, 1);
|
||
}
|
||
return count;
|
||
}
|
||
|
||
static unsigned
|
||
omap2_mcspi_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer)
|
||
{
|
||
struct omap2_mcspi *mcspi;
|
||
struct omap2_mcspi_cs *cs = spi->controller_state;
|
||
unsigned int count, c;
|
||
u32 l;
|
||
void __iomem *base = cs->base;
|
||
void __iomem *tx_reg;
|
||
void __iomem *rx_reg;
|
||
void __iomem *chstat_reg;
|
||
int word_len;
|
||
|
||
mcspi = spi_master_get_devdata(spi->master);
|
||
count = xfer->len;
|
||
c = count;
|
||
word_len = cs->word_len;
|
||
|
||
l = mcspi_cached_chconf0(spi);
|
||
|
||
/* We store the pre-calculated register addresses on stack to speed
|
||
* up the transfer loop. */
|
||
tx_reg = base + OMAP2_MCSPI_TX0;
|
||
rx_reg = base + OMAP2_MCSPI_RX0;
|
||
chstat_reg = base + OMAP2_MCSPI_CHSTAT0;
|
||
|
||
if (c < (word_len>>3))
|
||
return 0;
|
||
|
||
if (word_len <= 8) {
|
||
u8 *rx;
|
||
const u8 *tx;
|
||
|
||
rx = xfer->rx_buf;
|
||
tx = xfer->tx_buf;
|
||
|
||
do {
|
||
c -= 1;
|
||
if (tx != NULL) {
|
||
if (mcspi_wait_for_reg_bit(chstat_reg,
|
||
OMAP2_MCSPI_CHSTAT_TXS) < 0) {
|
||
dev_err(&spi->dev, "TXS timed out\n");
|
||
goto out;
|
||
}
|
||
dev_vdbg(&spi->dev, "write-%d %02x\n",
|
||
word_len, *tx);
|
||
__raw_writel(*tx++, tx_reg);
|
||
}
|
||
if (rx != NULL) {
|
||
if (mcspi_wait_for_reg_bit(chstat_reg,
|
||
OMAP2_MCSPI_CHSTAT_RXS) < 0) {
|
||
dev_err(&spi->dev, "RXS timed out\n");
|
||
goto out;
|
||
}
|
||
|
||
if (c == 1 && tx == NULL &&
|
||
(l & OMAP2_MCSPI_CHCONF_TURBO)) {
|
||
omap2_mcspi_set_enable(spi, 0);
|
||
*rx++ = __raw_readl(rx_reg);
|
||
dev_vdbg(&spi->dev, "read-%d %02x\n",
|
||
word_len, *(rx - 1));
|
||
if (mcspi_wait_for_reg_bit(chstat_reg,
|
||
OMAP2_MCSPI_CHSTAT_RXS) < 0) {
|
||
dev_err(&spi->dev,
|
||
"RXS timed out\n");
|
||
goto out;
|
||
}
|
||
c = 0;
|
||
} else if (c == 0 && tx == NULL) {
|
||
omap2_mcspi_set_enable(spi, 0);
|
||
}
|
||
|
||
*rx++ = __raw_readl(rx_reg);
|
||
dev_vdbg(&spi->dev, "read-%d %02x\n",
|
||
word_len, *(rx - 1));
|
||
}
|
||
} while (c);
|
||
} else if (word_len <= 16) {
|
||
u16 *rx;
|
||
const u16 *tx;
|
||
|
||
rx = xfer->rx_buf;
|
||
tx = xfer->tx_buf;
|
||
do {
|
||
c -= 2;
|
||
if (tx != NULL) {
|
||
if (mcspi_wait_for_reg_bit(chstat_reg,
|
||
OMAP2_MCSPI_CHSTAT_TXS) < 0) {
|
||
dev_err(&spi->dev, "TXS timed out\n");
|
||
goto out;
|
||
}
|
||
dev_vdbg(&spi->dev, "write-%d %04x\n",
|
||
word_len, *tx);
|
||
__raw_writel(*tx++, tx_reg);
|
||
}
|
||
if (rx != NULL) {
|
||
if (mcspi_wait_for_reg_bit(chstat_reg,
|
||
OMAP2_MCSPI_CHSTAT_RXS) < 0) {
|
||
dev_err(&spi->dev, "RXS timed out\n");
|
||
goto out;
|
||
}
|
||
|
||
if (c == 2 && tx == NULL &&
|
||
(l & OMAP2_MCSPI_CHCONF_TURBO)) {
|
||
omap2_mcspi_set_enable(spi, 0);
|
||
*rx++ = __raw_readl(rx_reg);
|
||
dev_vdbg(&spi->dev, "read-%d %04x\n",
|
||
word_len, *(rx - 1));
|
||
if (mcspi_wait_for_reg_bit(chstat_reg,
|
||
OMAP2_MCSPI_CHSTAT_RXS) < 0) {
|
||
dev_err(&spi->dev,
|
||
"RXS timed out\n");
|
||
goto out;
|
||
}
|
||
c = 0;
|
||
} else if (c == 0 && tx == NULL) {
|
||
omap2_mcspi_set_enable(spi, 0);
|
||
}
|
||
|
||
*rx++ = __raw_readl(rx_reg);
|
||
dev_vdbg(&spi->dev, "read-%d %04x\n",
|
||
word_len, *(rx - 1));
|
||
}
|
||
} while (c >= 2);
|
||
} else if (word_len <= 32) {
|
||
u32 *rx;
|
||
const u32 *tx;
|
||
|
||
rx = xfer->rx_buf;
|
||
tx = xfer->tx_buf;
|
||
do {
|
||
c -= 4;
|
||
if (tx != NULL) {
|
||
if (mcspi_wait_for_reg_bit(chstat_reg,
|
||
OMAP2_MCSPI_CHSTAT_TXS) < 0) {
|
||
dev_err(&spi->dev, "TXS timed out\n");
|
||
goto out;
|
||
}
|
||
dev_vdbg(&spi->dev, "write-%d %08x\n",
|
||
word_len, *tx);
|
||
__raw_writel(*tx++, tx_reg);
|
||
}
|
||
if (rx != NULL) {
|
||
if (mcspi_wait_for_reg_bit(chstat_reg,
|
||
OMAP2_MCSPI_CHSTAT_RXS) < 0) {
|
||
dev_err(&spi->dev, "RXS timed out\n");
|
||
goto out;
|
||
}
|
||
|
||
if (c == 4 && tx == NULL &&
|
||
(l & OMAP2_MCSPI_CHCONF_TURBO)) {
|
||
omap2_mcspi_set_enable(spi, 0);
|
||
*rx++ = __raw_readl(rx_reg);
|
||
dev_vdbg(&spi->dev, "read-%d %08x\n",
|
||
word_len, *(rx - 1));
|
||
if (mcspi_wait_for_reg_bit(chstat_reg,
|
||
OMAP2_MCSPI_CHSTAT_RXS) < 0) {
|
||
dev_err(&spi->dev,
|
||
"RXS timed out\n");
|
||
goto out;
|
||
}
|
||
c = 0;
|
||
} else if (c == 0 && tx == NULL) {
|
||
omap2_mcspi_set_enable(spi, 0);
|
||
}
|
||
|
||
*rx++ = __raw_readl(rx_reg);
|
||
dev_vdbg(&spi->dev, "read-%d %08x\n",
|
||
word_len, *(rx - 1));
|
||
}
|
||
} while (c >= 4);
|
||
}
|
||
|
||
/* for TX_ONLY mode, be sure all words have shifted out */
|
||
if (xfer->rx_buf == NULL) {
|
||
if (mcspi_wait_for_reg_bit(chstat_reg,
|
||
OMAP2_MCSPI_CHSTAT_TXS) < 0) {
|
||
dev_err(&spi->dev, "TXS timed out\n");
|
||
} else if (mcspi_wait_for_reg_bit(chstat_reg,
|
||
OMAP2_MCSPI_CHSTAT_EOT) < 0)
|
||
dev_err(&spi->dev, "EOT timed out\n");
|
||
|
||
/* disable chan to purge rx datas received in TX_ONLY transfer,
|
||
* otherwise these rx datas will affect the direct following
|
||
* RX_ONLY transfer.
|
||
*/
|
||
omap2_mcspi_set_enable(spi, 0);
|
||
}
|
||
out:
|
||
omap2_mcspi_set_enable(spi, 1);
|
||
return count - c;
|
||
}
|
||
|
||
static u32 omap2_mcspi_calc_divisor(u32 speed_hz)
|
||
{
|
||
u32 div;
|
||
|
||
for (div = 0; div < 15; div++)
|
||
if (speed_hz >= (OMAP2_MCSPI_MAX_FREQ >> div))
|
||
return div;
|
||
|
||
return 15;
|
||
}
|
||
|
||
/* called only when no transfer is active to this device */
|
||
static int omap2_mcspi_setup_transfer(struct spi_device *spi,
|
||
struct spi_transfer *t)
|
||
{
|
||
struct omap2_mcspi_cs *cs = spi->controller_state;
|
||
struct omap2_mcspi *mcspi;
|
||
struct spi_master *spi_cntrl;
|
||
u32 l = 0, div = 0;
|
||
u8 word_len = spi->bits_per_word;
|
||
u32 speed_hz = spi->max_speed_hz;
|
||
|
||
mcspi = spi_master_get_devdata(spi->master);
|
||
spi_cntrl = mcspi->master;
|
||
|
||
if (t != NULL && t->bits_per_word)
|
||
word_len = t->bits_per_word;
|
||
|
||
cs->word_len = word_len;
|
||
|
||
if (t && t->speed_hz)
|
||
speed_hz = t->speed_hz;
|
||
|
||
speed_hz = min_t(u32, speed_hz, OMAP2_MCSPI_MAX_FREQ);
|
||
div = omap2_mcspi_calc_divisor(speed_hz);
|
||
|
||
l = mcspi_cached_chconf0(spi);
|
||
|
||
/* standard 4-wire master mode: SCK, MOSI/out, MISO/in, nCS
|
||
* REVISIT: this controller could support SPI_3WIRE mode.
|
||
*/
|
||
l &= ~(OMAP2_MCSPI_CHCONF_IS|OMAP2_MCSPI_CHCONF_DPE1);
|
||
l |= OMAP2_MCSPI_CHCONF_DPE0;
|
||
|
||
/* wordlength */
|
||
l &= ~OMAP2_MCSPI_CHCONF_WL_MASK;
|
||
l |= (word_len - 1) << 7;
|
||
|
||
/* set chipselect polarity; manage with FORCE */
|
||
if (!(spi->mode & SPI_CS_HIGH))
|
||
l |= OMAP2_MCSPI_CHCONF_EPOL; /* active-low; normal */
|
||
else
|
||
l &= ~OMAP2_MCSPI_CHCONF_EPOL;
|
||
|
||
/* set clock divisor */
|
||
l &= ~OMAP2_MCSPI_CHCONF_CLKD_MASK;
|
||
l |= div << 2;
|
||
|
||
/* set SPI mode 0..3 */
|
||
if (spi->mode & SPI_CPOL)
|
||
l |= OMAP2_MCSPI_CHCONF_POL;
|
||
else
|
||
l &= ~OMAP2_MCSPI_CHCONF_POL;
|
||
if (spi->mode & SPI_CPHA)
|
||
l |= OMAP2_MCSPI_CHCONF_PHA;
|
||
else
|
||
l &= ~OMAP2_MCSPI_CHCONF_PHA;
|
||
|
||
mcspi_write_chconf0(spi, l);
|
||
|
||
dev_dbg(&spi->dev, "setup: speed %d, sample %s edge, clk %s\n",
|
||
OMAP2_MCSPI_MAX_FREQ >> div,
|
||
(spi->mode & SPI_CPHA) ? "trailing" : "leading",
|
||
(spi->mode & SPI_CPOL) ? "inverted" : "normal");
|
||
|
||
return 0;
|
||
}
|
||
|
||
static void omap2_mcspi_dma_rx_callback(int lch, u16 ch_status, void *data)
|
||
{
|
||
struct spi_device *spi = data;
|
||
struct omap2_mcspi *mcspi;
|
||
struct omap2_mcspi_dma *mcspi_dma;
|
||
|
||
mcspi = spi_master_get_devdata(spi->master);
|
||
mcspi_dma = &(mcspi->dma_channels[spi->chip_select]);
|
||
|
||
complete(&mcspi_dma->dma_rx_completion);
|
||
|
||
/* We must disable the DMA RX request */
|
||
omap2_mcspi_set_dma_req(spi, 1, 0);
|
||
}
|
||
|
||
static void omap2_mcspi_dma_tx_callback(int lch, u16 ch_status, void *data)
|
||
{
|
||
struct spi_device *spi = data;
|
||
struct omap2_mcspi *mcspi;
|
||
struct omap2_mcspi_dma *mcspi_dma;
|
||
|
||
mcspi = spi_master_get_devdata(spi->master);
|
||
mcspi_dma = &(mcspi->dma_channels[spi->chip_select]);
|
||
|
||
complete(&mcspi_dma->dma_tx_completion);
|
||
|
||
/* We must disable the DMA TX request */
|
||
omap2_mcspi_set_dma_req(spi, 0, 0);
|
||
}
|
||
|
||
static int omap2_mcspi_request_dma(struct spi_device *spi)
|
||
{
|
||
struct spi_master *master = spi->master;
|
||
struct omap2_mcspi *mcspi;
|
||
struct omap2_mcspi_dma *mcspi_dma;
|
||
|
||
mcspi = spi_master_get_devdata(master);
|
||
mcspi_dma = mcspi->dma_channels + spi->chip_select;
|
||
|
||
if (omap_request_dma(mcspi_dma->dma_rx_sync_dev, "McSPI RX",
|
||
omap2_mcspi_dma_rx_callback, spi,
|
||
&mcspi_dma->dma_rx_channel)) {
|
||
dev_err(&spi->dev, "no RX DMA channel for McSPI\n");
|
||
return -EAGAIN;
|
||
}
|
||
|
||
if (omap_request_dma(mcspi_dma->dma_tx_sync_dev, "McSPI TX",
|
||
omap2_mcspi_dma_tx_callback, spi,
|
||
&mcspi_dma->dma_tx_channel)) {
|
||
omap_free_dma(mcspi_dma->dma_rx_channel);
|
||
mcspi_dma->dma_rx_channel = -1;
|
||
dev_err(&spi->dev, "no TX DMA channel for McSPI\n");
|
||
return -EAGAIN;
|
||
}
|
||
|
||
init_completion(&mcspi_dma->dma_rx_completion);
|
||
init_completion(&mcspi_dma->dma_tx_completion);
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int omap2_mcspi_setup(struct spi_device *spi)
|
||
{
|
||
int ret;
|
||
struct omap2_mcspi *mcspi;
|
||
struct omap2_mcspi_dma *mcspi_dma;
|
||
struct omap2_mcspi_cs *cs = spi->controller_state;
|
||
|
||
if (spi->bits_per_word < 4 || spi->bits_per_word > 32) {
|
||
dev_dbg(&spi->dev, "setup: unsupported %d bit words\n",
|
||
spi->bits_per_word);
|
||
return -EINVAL;
|
||
}
|
||
|
||
mcspi = spi_master_get_devdata(spi->master);
|
||
mcspi_dma = &mcspi->dma_channels[spi->chip_select];
|
||
|
||
if (!cs) {
|
||
cs = kzalloc(sizeof *cs, GFP_KERNEL);
|
||
if (!cs)
|
||
return -ENOMEM;
|
||
cs->base = mcspi->base + spi->chip_select * 0x14;
|
||
cs->phys = mcspi->phys + spi->chip_select * 0x14;
|
||
cs->chconf0 = 0;
|
||
spi->controller_state = cs;
|
||
/* Link this to context save list */
|
||
list_add_tail(&cs->node,
|
||
&omap2_mcspi_ctx[mcspi->master->bus_num - 1].cs);
|
||
}
|
||
|
||
if (mcspi_dma->dma_rx_channel == -1
|
||
|| mcspi_dma->dma_tx_channel == -1) {
|
||
ret = omap2_mcspi_request_dma(spi);
|
||
if (ret < 0)
|
||
return ret;
|
||
}
|
||
|
||
ret = omap2_mcspi_enable_clocks(mcspi);
|
||
if (ret < 0)
|
||
return ret;
|
||
|
||
ret = omap2_mcspi_setup_transfer(spi, NULL);
|
||
omap2_mcspi_disable_clocks(mcspi);
|
||
|
||
return ret;
|
||
}
|
||
|
||
static void omap2_mcspi_cleanup(struct spi_device *spi)
|
||
{
|
||
struct omap2_mcspi *mcspi;
|
||
struct omap2_mcspi_dma *mcspi_dma;
|
||
struct omap2_mcspi_cs *cs;
|
||
|
||
mcspi = spi_master_get_devdata(spi->master);
|
||
|
||
if (spi->controller_state) {
|
||
/* Unlink controller state from context save list */
|
||
cs = spi->controller_state;
|
||
list_del(&cs->node);
|
||
|
||
kfree(spi->controller_state);
|
||
}
|
||
|
||
if (spi->chip_select < spi->master->num_chipselect) {
|
||
mcspi_dma = &mcspi->dma_channels[spi->chip_select];
|
||
|
||
if (mcspi_dma->dma_rx_channel != -1) {
|
||
omap_free_dma(mcspi_dma->dma_rx_channel);
|
||
mcspi_dma->dma_rx_channel = -1;
|
||
}
|
||
if (mcspi_dma->dma_tx_channel != -1) {
|
||
omap_free_dma(mcspi_dma->dma_tx_channel);
|
||
mcspi_dma->dma_tx_channel = -1;
|
||
}
|
||
}
|
||
}
|
||
|
||
static void omap2_mcspi_work(struct work_struct *work)
|
||
{
|
||
struct omap2_mcspi *mcspi;
|
||
|
||
mcspi = container_of(work, struct omap2_mcspi, work);
|
||
|
||
if (omap2_mcspi_enable_clocks(mcspi) < 0)
|
||
return;
|
||
|
||
spin_lock_irq(&mcspi->lock);
|
||
|
||
/* We only enable one channel at a time -- the one whose message is
|
||
* at the head of the queue -- although this controller would gladly
|
||
* arbitrate among multiple channels. This corresponds to "single
|
||
* channel" master mode. As a side effect, we need to manage the
|
||
* chipselect with the FORCE bit ... CS != channel enable.
|
||
*/
|
||
while (!list_empty(&mcspi->msg_queue)) {
|
||
struct spi_message *m;
|
||
struct spi_device *spi;
|
||
struct spi_transfer *t = NULL;
|
||
int cs_active = 0;
|
||
struct omap2_mcspi_cs *cs;
|
||
struct omap2_mcspi_device_config *cd;
|
||
int par_override = 0;
|
||
int status = 0;
|
||
u32 chconf;
|
||
|
||
m = container_of(mcspi->msg_queue.next, struct spi_message,
|
||
queue);
|
||
|
||
list_del_init(&m->queue);
|
||
spin_unlock_irq(&mcspi->lock);
|
||
|
||
spi = m->spi;
|
||
cs = spi->controller_state;
|
||
cd = spi->controller_data;
|
||
|
||
omap2_mcspi_set_enable(spi, 1);
|
||
list_for_each_entry(t, &m->transfers, transfer_list) {
|
||
if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) {
|
||
status = -EINVAL;
|
||
break;
|
||
}
|
||
if (par_override || t->speed_hz || t->bits_per_word) {
|
||
par_override = 1;
|
||
status = omap2_mcspi_setup_transfer(spi, t);
|
||
if (status < 0)
|
||
break;
|
||
if (!t->speed_hz && !t->bits_per_word)
|
||
par_override = 0;
|
||
}
|
||
|
||
if (!cs_active) {
|
||
omap2_mcspi_force_cs(spi, 1);
|
||
cs_active = 1;
|
||
}
|
||
|
||
chconf = mcspi_cached_chconf0(spi);
|
||
chconf &= ~OMAP2_MCSPI_CHCONF_TRM_MASK;
|
||
chconf &= ~OMAP2_MCSPI_CHCONF_TURBO;
|
||
|
||
if (t->tx_buf == NULL)
|
||
chconf |= OMAP2_MCSPI_CHCONF_TRM_RX_ONLY;
|
||
else if (t->rx_buf == NULL)
|
||
chconf |= OMAP2_MCSPI_CHCONF_TRM_TX_ONLY;
|
||
|
||
if (cd && cd->turbo_mode && t->tx_buf == NULL) {
|
||
/* Turbo mode is for more than one word */
|
||
if (t->len > ((cs->word_len + 7) >> 3))
|
||
chconf |= OMAP2_MCSPI_CHCONF_TURBO;
|
||
}
|
||
|
||
mcspi_write_chconf0(spi, chconf);
|
||
|
||
if (t->len) {
|
||
unsigned count;
|
||
|
||
/* RX_ONLY mode needs dummy data in TX reg */
|
||
if (t->tx_buf == NULL)
|
||
__raw_writel(0, cs->base
|
||
+ OMAP2_MCSPI_TX0);
|
||
|
||
if (m->is_dma_mapped || t->len >= DMA_MIN_BYTES)
|
||
count = omap2_mcspi_txrx_dma(spi, t);
|
||
else
|
||
count = omap2_mcspi_txrx_pio(spi, t);
|
||
m->actual_length += count;
|
||
|
||
if (count != t->len) {
|
||
status = -EIO;
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (t->delay_usecs)
|
||
udelay(t->delay_usecs);
|
||
|
||
/* ignore the "leave it on after last xfer" hint */
|
||
if (t->cs_change) {
|
||
omap2_mcspi_force_cs(spi, 0);
|
||
cs_active = 0;
|
||
}
|
||
}
|
||
|
||
/* Restore defaults if they were overriden */
|
||
if (par_override) {
|
||
par_override = 0;
|
||
status = omap2_mcspi_setup_transfer(spi, NULL);
|
||
}
|
||
|
||
if (cs_active)
|
||
omap2_mcspi_force_cs(spi, 0);
|
||
|
||
omap2_mcspi_set_enable(spi, 0);
|
||
|
||
m->status = status;
|
||
m->complete(m->context);
|
||
|
||
spin_lock_irq(&mcspi->lock);
|
||
}
|
||
|
||
spin_unlock_irq(&mcspi->lock);
|
||
|
||
omap2_mcspi_disable_clocks(mcspi);
|
||
}
|
||
|
||
static int omap2_mcspi_transfer(struct spi_device *spi, struct spi_message *m)
|
||
{
|
||
struct omap2_mcspi *mcspi;
|
||
unsigned long flags;
|
||
struct spi_transfer *t;
|
||
|
||
m->actual_length = 0;
|
||
m->status = 0;
|
||
|
||
/* reject invalid messages and transfers */
|
||
if (list_empty(&m->transfers) || !m->complete)
|
||
return -EINVAL;
|
||
list_for_each_entry(t, &m->transfers, transfer_list) {
|
||
const void *tx_buf = t->tx_buf;
|
||
void *rx_buf = t->rx_buf;
|
||
unsigned len = t->len;
|
||
|
||
if (t->speed_hz > OMAP2_MCSPI_MAX_FREQ
|
||
|| (len && !(rx_buf || tx_buf))
|
||
|| (t->bits_per_word &&
|
||
( t->bits_per_word < 4
|
||
|| t->bits_per_word > 32))) {
|
||
dev_dbg(&spi->dev, "transfer: %d Hz, %d %s%s, %d bpw\n",
|
||
t->speed_hz,
|
||
len,
|
||
tx_buf ? "tx" : "",
|
||
rx_buf ? "rx" : "",
|
||
t->bits_per_word);
|
||
return -EINVAL;
|
||
}
|
||
if (t->speed_hz && t->speed_hz < (OMAP2_MCSPI_MAX_FREQ >> 15)) {
|
||
dev_dbg(&spi->dev, "speed_hz %d below minimum %d Hz\n",
|
||
t->speed_hz,
|
||
OMAP2_MCSPI_MAX_FREQ >> 15);
|
||
return -EINVAL;
|
||
}
|
||
|
||
if (m->is_dma_mapped || len < DMA_MIN_BYTES)
|
||
continue;
|
||
|
||
if (tx_buf != NULL) {
|
||
t->tx_dma = dma_map_single(&spi->dev, (void *) tx_buf,
|
||
len, DMA_TO_DEVICE);
|
||
if (dma_mapping_error(&spi->dev, t->tx_dma)) {
|
||
dev_dbg(&spi->dev, "dma %cX %d bytes error\n",
|
||
'T', len);
|
||
return -EINVAL;
|
||
}
|
||
}
|
||
if (rx_buf != NULL) {
|
||
t->rx_dma = dma_map_single(&spi->dev, rx_buf, t->len,
|
||
DMA_FROM_DEVICE);
|
||
if (dma_mapping_error(&spi->dev, t->rx_dma)) {
|
||
dev_dbg(&spi->dev, "dma %cX %d bytes error\n",
|
||
'R', len);
|
||
if (tx_buf != NULL)
|
||
dma_unmap_single(&spi->dev, t->tx_dma,
|
||
len, DMA_TO_DEVICE);
|
||
return -EINVAL;
|
||
}
|
||
}
|
||
}
|
||
|
||
mcspi = spi_master_get_devdata(spi->master);
|
||
|
||
spin_lock_irqsave(&mcspi->lock, flags);
|
||
list_add_tail(&m->queue, &mcspi->msg_queue);
|
||
queue_work(omap2_mcspi_wq, &mcspi->work);
|
||
spin_unlock_irqrestore(&mcspi->lock, flags);
|
||
|
||
return 0;
|
||
}
|
||
|
||
static int __init omap2_mcspi_master_setup(struct omap2_mcspi *mcspi)
|
||
{
|
||
struct spi_master *master = mcspi->master;
|
||
u32 tmp;
|
||
int ret = 0;
|
||
|
||
ret = omap2_mcspi_enable_clocks(mcspi);
|
||
if (ret < 0)
|
||
return ret;
|
||
|
||
tmp = OMAP2_MCSPI_WAKEUPENABLE_WKEN;
|
||
mcspi_write_reg(master, OMAP2_MCSPI_WAKEUPENABLE, tmp);
|
||
omap2_mcspi_ctx[master->bus_num - 1].wakeupenable = tmp;
|
||
|
||
omap2_mcspi_set_master_mode(master);
|
||
omap2_mcspi_disable_clocks(mcspi);
|
||
return 0;
|
||
}
|
||
|
||
static int omap_mcspi_runtime_resume(struct device *dev)
|
||
{
|
||
struct omap2_mcspi *mcspi;
|
||
struct spi_master *master;
|
||
|
||
master = dev_get_drvdata(dev);
|
||
mcspi = spi_master_get_devdata(master);
|
||
omap2_mcspi_restore_ctx(mcspi);
|
||
|
||
return 0;
|
||
}
|
||
|
||
|
||
static int __init omap2_mcspi_probe(struct platform_device *pdev)
|
||
{
|
||
struct spi_master *master;
|
||
struct omap2_mcspi_platform_config *pdata = pdev->dev.platform_data;
|
||
struct omap2_mcspi *mcspi;
|
||
struct resource *r;
|
||
int status = 0, i;
|
||
|
||
master = spi_alloc_master(&pdev->dev, sizeof *mcspi);
|
||
if (master == NULL) {
|
||
dev_dbg(&pdev->dev, "master allocation failed\n");
|
||
return -ENOMEM;
|
||
}
|
||
|
||
/* the spi->mode bits understood by this driver: */
|
||
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
|
||
|
||
if (pdev->id != -1)
|
||
master->bus_num = pdev->id;
|
||
|
||
master->setup = omap2_mcspi_setup;
|
||
master->transfer = omap2_mcspi_transfer;
|
||
master->cleanup = omap2_mcspi_cleanup;
|
||
master->num_chipselect = pdata->num_cs;
|
||
|
||
dev_set_drvdata(&pdev->dev, master);
|
||
|
||
mcspi = spi_master_get_devdata(master);
|
||
mcspi->master = master;
|
||
|
||
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||
if (r == NULL) {
|
||
status = -ENODEV;
|
||
goto err1;
|
||
}
|
||
if (!request_mem_region(r->start, (r->end - r->start) + 1,
|
||
dev_name(&pdev->dev))) {
|
||
status = -EBUSY;
|
||
goto err1;
|
||
}
|
||
|
||
r->start += pdata->regs_offset;
|
||
r->end += pdata->regs_offset;
|
||
mcspi->phys = r->start;
|
||
mcspi->base = ioremap(r->start, r->end - r->start + 1);
|
||
if (!mcspi->base) {
|
||
dev_dbg(&pdev->dev, "can't ioremap MCSPI\n");
|
||
status = -ENOMEM;
|
||
goto err2;
|
||
}
|
||
|
||
mcspi->dev = &pdev->dev;
|
||
INIT_WORK(&mcspi->work, omap2_mcspi_work);
|
||
|
||
spin_lock_init(&mcspi->lock);
|
||
INIT_LIST_HEAD(&mcspi->msg_queue);
|
||
INIT_LIST_HEAD(&omap2_mcspi_ctx[master->bus_num - 1].cs);
|
||
|
||
mcspi->dma_channels = kcalloc(master->num_chipselect,
|
||
sizeof(struct omap2_mcspi_dma),
|
||
GFP_KERNEL);
|
||
|
||
if (mcspi->dma_channels == NULL)
|
||
goto err2;
|
||
|
||
for (i = 0; i < master->num_chipselect; i++) {
|
||
char dma_ch_name[14];
|
||
struct resource *dma_res;
|
||
|
||
sprintf(dma_ch_name, "rx%d", i);
|
||
dma_res = platform_get_resource_byname(pdev, IORESOURCE_DMA,
|
||
dma_ch_name);
|
||
if (!dma_res) {
|
||
dev_dbg(&pdev->dev, "cannot get DMA RX channel\n");
|
||
status = -ENODEV;
|
||
break;
|
||
}
|
||
|
||
mcspi->dma_channels[i].dma_rx_channel = -1;
|
||
mcspi->dma_channels[i].dma_rx_sync_dev = dma_res->start;
|
||
sprintf(dma_ch_name, "tx%d", i);
|
||
dma_res = platform_get_resource_byname(pdev, IORESOURCE_DMA,
|
||
dma_ch_name);
|
||
if (!dma_res) {
|
||
dev_dbg(&pdev->dev, "cannot get DMA TX channel\n");
|
||
status = -ENODEV;
|
||
break;
|
||
}
|
||
|
||
mcspi->dma_channels[i].dma_tx_channel = -1;
|
||
mcspi->dma_channels[i].dma_tx_sync_dev = dma_res->start;
|
||
}
|
||
|
||
pm_runtime_enable(&pdev->dev);
|
||
|
||
if (status || omap2_mcspi_master_setup(mcspi) < 0)
|
||
goto err3;
|
||
|
||
status = spi_register_master(master);
|
||
if (status < 0)
|
||
goto err4;
|
||
|
||
return status;
|
||
|
||
err4:
|
||
spi_master_put(master);
|
||
err3:
|
||
kfree(mcspi->dma_channels);
|
||
err2:
|
||
release_mem_region(r->start, (r->end - r->start) + 1);
|
||
iounmap(mcspi->base);
|
||
err1:
|
||
return status;
|
||
}
|
||
|
||
static int __exit omap2_mcspi_remove(struct platform_device *pdev)
|
||
{
|
||
struct spi_master *master;
|
||
struct omap2_mcspi *mcspi;
|
||
struct omap2_mcspi_dma *dma_channels;
|
||
struct resource *r;
|
||
void __iomem *base;
|
||
|
||
master = dev_get_drvdata(&pdev->dev);
|
||
mcspi = spi_master_get_devdata(master);
|
||
dma_channels = mcspi->dma_channels;
|
||
|
||
omap2_mcspi_disable_clocks(mcspi);
|
||
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||
release_mem_region(r->start, (r->end - r->start) + 1);
|
||
|
||
base = mcspi->base;
|
||
spi_unregister_master(master);
|
||
iounmap(base);
|
||
kfree(dma_channels);
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* work with hotplug and coldplug */
|
||
MODULE_ALIAS("platform:omap2_mcspi");
|
||
|
||
#ifdef CONFIG_SUSPEND
|
||
/*
|
||
* When SPI wake up from off-mode, CS is in activate state. If it was in
|
||
* unactive state when driver was suspend, then force it to unactive state at
|
||
* wake up.
|
||
*/
|
||
static int omap2_mcspi_resume(struct device *dev)
|
||
{
|
||
struct spi_master *master = dev_get_drvdata(dev);
|
||
struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
|
||
struct omap2_mcspi_cs *cs;
|
||
|
||
omap2_mcspi_enable_clocks(mcspi);
|
||
list_for_each_entry(cs, &omap2_mcspi_ctx[master->bus_num - 1].cs,
|
||
node) {
|
||
if ((cs->chconf0 & OMAP2_MCSPI_CHCONF_FORCE) == 0) {
|
||
|
||
/*
|
||
* We need to toggle CS state for OMAP take this
|
||
* change in account.
|
||
*/
|
||
MOD_REG_BIT(cs->chconf0, OMAP2_MCSPI_CHCONF_FORCE, 1);
|
||
__raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0);
|
||
MOD_REG_BIT(cs->chconf0, OMAP2_MCSPI_CHCONF_FORCE, 0);
|
||
__raw_writel(cs->chconf0, cs->base + OMAP2_MCSPI_CHCONF0);
|
||
}
|
||
}
|
||
omap2_mcspi_disable_clocks(mcspi);
|
||
return 0;
|
||
}
|
||
#else
|
||
#define omap2_mcspi_resume NULL
|
||
#endif
|
||
|
||
static const struct dev_pm_ops omap2_mcspi_pm_ops = {
|
||
.resume = omap2_mcspi_resume,
|
||
.runtime_resume = omap_mcspi_runtime_resume,
|
||
};
|
||
|
||
static struct platform_driver omap2_mcspi_driver = {
|
||
.driver = {
|
||
.name = "omap2_mcspi",
|
||
.owner = THIS_MODULE,
|
||
.pm = &omap2_mcspi_pm_ops
|
||
},
|
||
.remove = __exit_p(omap2_mcspi_remove),
|
||
};
|
||
|
||
|
||
static int __init omap2_mcspi_init(void)
|
||
{
|
||
omap2_mcspi_wq = create_singlethread_workqueue(
|
||
omap2_mcspi_driver.driver.name);
|
||
if (omap2_mcspi_wq == NULL)
|
||
return -1;
|
||
return platform_driver_probe(&omap2_mcspi_driver, omap2_mcspi_probe);
|
||
}
|
||
subsys_initcall(omap2_mcspi_init);
|
||
|
||
static void __exit omap2_mcspi_exit(void)
|
||
{
|
||
platform_driver_unregister(&omap2_mcspi_driver);
|
||
|
||
destroy_workqueue(omap2_mcspi_wq);
|
||
}
|
||
module_exit(omap2_mcspi_exit);
|
||
|
||
MODULE_LICENSE("GPL");
|