#define AUTOSUSPEND_TIMEOUT 2000
+struct fsl_espi {
+ struct device *dev;
+ void __iomem *reg_base;
+
+ const void *tx;
+ void *rx;
+
+ unsigned int rx_len;
+ unsigned int tx_len;
+ unsigned int rxskip;
+
+ u8 *local_buf;
+ spinlock_t lock;
+
+ u32 spibrg; /* SPIBRG input clock */
+
+ struct completion done;
+};
+
struct fsl_espi_cs {
u32 hw_mode;
};
-static inline u32 fsl_espi_read_reg(struct mpc8xxx_spi *mspi, int offset)
+static inline u32 fsl_espi_read_reg(struct fsl_espi *espi, int offset)
{
- return ioread32be(mspi->reg_base + offset);
+ return ioread32be(espi->reg_base + offset);
}
-static inline u8 fsl_espi_read_reg8(struct mpc8xxx_spi *mspi, int offset)
+static inline u8 fsl_espi_read_reg8(struct fsl_espi *espi, int offset)
{
- return ioread8(mspi->reg_base + offset);
+ return ioread8(espi->reg_base + offset);
}
-static inline void fsl_espi_write_reg(struct mpc8xxx_spi *mspi, int offset,
+static inline void fsl_espi_write_reg(struct fsl_espi *espi, int offset,
u32 val)
{
- iowrite32be(val, mspi->reg_base + offset);
+ iowrite32be(val, espi->reg_base + offset);
}
-static inline void fsl_espi_write_reg8(struct mpc8xxx_spi *mspi, int offset,
+static inline void fsl_espi_write_reg8(struct fsl_espi *espi, int offset,
u8 val)
{
- iowrite8(val, mspi->reg_base + offset);
+ iowrite8(val, espi->reg_base + offset);
}
static void fsl_espi_memcpy_swab(void *to, const void *from,
}
static void fsl_espi_copy_to_buf(struct spi_message *m,
- struct mpc8xxx_spi *mspi)
+ struct fsl_espi *espi)
{
struct spi_transfer *t;
- u8 *buf = mspi->local_buf;
+ u8 *buf = espi->local_buf;
list_for_each_entry(t, &m->transfers, transfer_list) {
if (t->tx_buf)
fsl_espi_memcpy_swab(buf, t->tx_buf, m, t);
/* In RXSKIP mode controller shifts out zeros internally */
- else if (!mspi->rxskip)
+ else if (!espi->rxskip)
memset(buf, 0, t->len);
buf += t->len;
}
}
static void fsl_espi_copy_from_buf(struct spi_message *m,
- struct mpc8xxx_spi *mspi)
+ struct fsl_espi *espi)
{
struct spi_transfer *t;
- u8 *buf = mspi->local_buf;
+ u8 *buf = espi->local_buf;
list_for_each_entry(t, &m->transfers, transfer_list) {
if (t->rx_buf)
static int fsl_espi_check_message(struct spi_message *m)
{
- struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
+ struct fsl_espi *espi = spi_master_get_devdata(m->spi->master);
struct spi_transfer *t, *first;
if (m->frame_length > SPCOM_TRANLEN_MAX) {
- dev_err(mspi->dev, "message too long, size is %u bytes\n",
+ dev_err(espi->dev, "message too long, size is %u bytes\n",
m->frame_length);
return -EMSGSIZE;
}
list_for_each_entry(t, &m->transfers, transfer_list) {
if (first->bits_per_word != t->bits_per_word ||
first->speed_hz != t->speed_hz) {
- dev_err(mspi->dev, "bits_per_word/speed_hz should be the same for all transfers\n");
+ dev_err(espi->dev, "bits_per_word/speed_hz should be the same for all transfers\n");
return -EINVAL;
}
}
/* ESPI supports MSB-first transfers for word size 8 / 16 only */
if (!(m->spi->mode & SPI_LSB_FIRST) && first->bits_per_word != 8 &&
first->bits_per_word != 16) {
- dev_err(mspi->dev,
+ dev_err(espi->dev,
"MSB-first transfer not supported for wordsize %u\n",
first->bits_per_word);
return -EINVAL;
return i == 2 ? rxskip : 0;
}
-static void fsl_espi_fill_tx_fifo(struct mpc8xxx_spi *mspi, u32 events)
+static void fsl_espi_fill_tx_fifo(struct fsl_espi *espi, u32 events)
{
u32 tx_fifo_avail;
/* if events is zero transfer has not started and tx fifo is empty */
tx_fifo_avail = events ? SPIE_TXCNT(events) : FSL_ESPI_FIFO_SIZE;
- while (tx_fifo_avail >= min(4U, mspi->tx_len) && mspi->tx_len)
- if (mspi->tx_len >= 4) {
- fsl_espi_write_reg(mspi, ESPI_SPITF, *(u32 *)mspi->tx);
- mspi->tx += 4;
- mspi->tx_len -= 4;
+ while (tx_fifo_avail >= min(4U, espi->tx_len) && espi->tx_len)
+ if (espi->tx_len >= 4) {
+ fsl_espi_write_reg(espi, ESPI_SPITF, *(u32 *)espi->tx);
+ espi->tx += 4;
+ espi->tx_len -= 4;
tx_fifo_avail -= 4;
} else {
- fsl_espi_write_reg8(mspi, ESPI_SPITF, *(u8 *)mspi->tx);
- mspi->tx += 1;
- mspi->tx_len -= 1;
+ fsl_espi_write_reg8(espi, ESPI_SPITF, *(u8 *)espi->tx);
+ espi->tx += 1;
+ espi->tx_len -= 1;
tx_fifo_avail -= 1;
}
}
-static void fsl_espi_read_rx_fifo(struct mpc8xxx_spi *mspi, u32 events)
+static void fsl_espi_read_rx_fifo(struct fsl_espi *espi, u32 events)
{
u32 rx_fifo_avail = SPIE_RXCNT(events);
- while (rx_fifo_avail >= min(4U, mspi->rx_len) && mspi->rx_len)
- if (mspi->rx_len >= 4) {
- *(u32 *)mspi->rx = fsl_espi_read_reg(mspi, ESPI_SPIRF);
- mspi->rx += 4;
- mspi->rx_len -= 4;
+ while (rx_fifo_avail >= min(4U, espi->rx_len) && espi->rx_len)
+ if (espi->rx_len >= 4) {
+ *(u32 *)espi->rx = fsl_espi_read_reg(espi, ESPI_SPIRF);
+ espi->rx += 4;
+ espi->rx_len -= 4;
rx_fifo_avail -= 4;
} else {
- *(u8 *)mspi->rx = fsl_espi_read_reg8(mspi, ESPI_SPIRF);
- mspi->rx += 1;
- mspi->rx_len -= 1;
+ *(u8 *)espi->rx = fsl_espi_read_reg8(espi, ESPI_SPIRF);
+ espi->rx += 1;
+ espi->rx_len -= 1;
rx_fifo_avail -= 1;
}
}
static void fsl_espi_setup_transfer(struct spi_device *spi,
struct spi_transfer *t)
{
- struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
+ struct fsl_espi *espi = spi_master_get_devdata(spi->master);
int bits_per_word = t ? t->bits_per_word : spi->bits_per_word;
u32 pm, hz = t ? t->speed_hz : spi->max_speed_hz;
struct fsl_espi_cs *cs = spi_get_ctldata(spi);
cs->hw_mode |= CSMODE_LEN(bits_per_word - 1);
- pm = DIV_ROUND_UP(mpc8xxx_spi->spibrg, hz * 4) - 1;
+ pm = DIV_ROUND_UP(espi->spibrg, hz * 4) - 1;
if (pm > 15) {
cs->hw_mode |= CSMODE_DIV16;
- pm = DIV_ROUND_UP(mpc8xxx_spi->spibrg, hz * 16 * 4) - 1;
+ pm = DIV_ROUND_UP(espi->spibrg, hz * 16 * 4) - 1;
WARN_ONCE(pm > 15,
"%s: Requested speed is too low: %u Hz. Will use %u Hz instead.\n",
dev_name(&spi->dev), hz,
- mpc8xxx_spi->spibrg / (4 * 16 * (15 + 1)));
+ espi->spibrg / (4 * 16 * (15 + 1)));
if (pm > 15)
pm = 15;
}
/* don't write the mode register if the mode doesn't change */
if (cs->hw_mode != hw_mode_old)
- fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODEx(spi->chip_select),
+ fsl_espi_write_reg(espi, ESPI_SPMODEx(spi->chip_select),
cs->hw_mode);
}
static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
{
- struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
+ struct fsl_espi *espi = spi_master_get_devdata(spi->master);
u32 mask, spcom;
int ret;
- mpc8xxx_spi->rx_len = t->len;
- mpc8xxx_spi->tx_len = t->len;
+ espi->rx_len = t->len;
+ espi->tx_len = t->len;
- mpc8xxx_spi->tx = t->tx_buf;
- mpc8xxx_spi->rx = t->rx_buf;
+ espi->tx = t->tx_buf;
+ espi->rx = t->rx_buf;
- reinit_completion(&mpc8xxx_spi->done);
+ reinit_completion(&espi->done);
/* Set SPCOM[CS] and SPCOM[TRANLEN] field */
spcom = SPCOM_CS(spi->chip_select);
spcom |= SPCOM_TRANLEN(t->len - 1);
/* configure RXSKIP mode */
- if (mpc8xxx_spi->rxskip) {
- spcom |= SPCOM_RXSKIP(mpc8xxx_spi->rxskip);
- mpc8xxx_spi->tx_len = mpc8xxx_spi->rxskip;
- mpc8xxx_spi->rx_len = t->len - mpc8xxx_spi->rxskip;
- mpc8xxx_spi->rx = t->rx_buf + mpc8xxx_spi->rxskip;
+ if (espi->rxskip) {
+ spcom |= SPCOM_RXSKIP(espi->rxskip);
+ espi->tx_len = espi->rxskip;
+ espi->rx_len = t->len - espi->rxskip;
+ espi->rx = t->rx_buf + espi->rxskip;
if (t->rx_nbits == SPI_NBITS_DUAL)
spcom |= SPCOM_DO;
}
- fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPCOM, spcom);
+ fsl_espi_write_reg(espi, ESPI_SPCOM, spcom);
/* enable interrupts */
mask = SPIM_DON;
- if (mpc8xxx_spi->rx_len > FSL_ESPI_FIFO_SIZE)
+ if (espi->rx_len > FSL_ESPI_FIFO_SIZE)
mask |= SPIM_RXT;
- fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPIM, mask);
+ fsl_espi_write_reg(espi, ESPI_SPIM, mask);
/* Prevent filling the fifo from getting interrupted */
- spin_lock_irq(&mpc8xxx_spi->lock);
- fsl_espi_fill_tx_fifo(mpc8xxx_spi, 0);
- spin_unlock_irq(&mpc8xxx_spi->lock);
+ spin_lock_irq(&espi->lock);
+ fsl_espi_fill_tx_fifo(espi, 0);
+ spin_unlock_irq(&espi->lock);
/* Won't hang up forever, SPI bus sometimes got lost interrupts... */
- ret = wait_for_completion_timeout(&mpc8xxx_spi->done, 2 * HZ);
+ ret = wait_for_completion_timeout(&espi->done, 2 * HZ);
if (ret == 0)
- dev_err(mpc8xxx_spi->dev,
+ dev_err(espi->dev,
"Transaction hanging up (left %u tx bytes, %u rx bytes)\n",
- mpc8xxx_spi->tx_len, mpc8xxx_spi->rx_len);
+ espi->tx_len, espi->rx_len);
/* disable rx ints */
- fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPIM, 0);
+ fsl_espi_write_reg(espi, ESPI_SPIM, 0);
return ret == 0 ? -ETIMEDOUT : 0;
}
static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans)
{
- struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
+ struct fsl_espi *espi = spi_master_get_devdata(m->spi->master);
struct spi_device *spi = m->spi;
int ret;
- mspi->rxskip = fsl_espi_check_rxskip_mode(m);
- if (trans->rx_nbits == SPI_NBITS_DUAL && !mspi->rxskip) {
- dev_err(mspi->dev, "Dual output mode requires RXSKIP mode!\n");
+ espi->rxskip = fsl_espi_check_rxskip_mode(m);
+ if (trans->rx_nbits == SPI_NBITS_DUAL && !espi->rxskip) {
+ dev_err(espi->dev, "Dual output mode requires RXSKIP mode!\n");
return -EINVAL;
}
- fsl_espi_copy_to_buf(m, mspi);
+ fsl_espi_copy_to_buf(m, espi);
fsl_espi_setup_transfer(spi, trans);
ret = fsl_espi_bufs(spi, trans);
udelay(trans->delay_usecs);
if (!ret)
- fsl_espi_copy_from_buf(m, mspi);
+ fsl_espi_copy_from_buf(m, espi);
return ret;
}
static int fsl_espi_do_one_msg(struct spi_master *master,
struct spi_message *m)
{
- struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
+ struct fsl_espi *espi = spi_master_get_devdata(m->spi->master);
unsigned int delay_usecs = 0, rx_nbits = 0;
struct spi_transfer *t, trans = {};
int ret;
trans.speed_hz = t->speed_hz;
trans.bits_per_word = t->bits_per_word;
trans.delay_usecs = delay_usecs;
- trans.tx_buf = mspi->local_buf;
- trans.rx_buf = mspi->local_buf;
+ trans.tx_buf = espi->local_buf;
+ trans.rx_buf = espi->local_buf;
trans.rx_nbits = rx_nbits;
if (trans.len)
static int fsl_espi_setup(struct spi_device *spi)
{
- struct mpc8xxx_spi *mpc8xxx_spi;
+ struct fsl_espi *espi;
u32 loop_mode;
struct fsl_espi_cs *cs = spi_get_ctldata(spi);
spi_set_ctldata(spi, cs);
}
- mpc8xxx_spi = spi_master_get_devdata(spi->master);
+ espi = spi_master_get_devdata(spi->master);
- pm_runtime_get_sync(mpc8xxx_spi->dev);
+ pm_runtime_get_sync(espi->dev);
- cs->hw_mode = fsl_espi_read_reg(mpc8xxx_spi,
- ESPI_SPMODEx(spi->chip_select));
+ cs->hw_mode = fsl_espi_read_reg(espi, ESPI_SPMODEx(spi->chip_select));
/* mask out bits we are going to set */
cs->hw_mode &= ~(CSMODE_CP_BEGIN_EDGECLK | CSMODE_CI_INACTIVEHIGH
| CSMODE_REV);
cs->hw_mode |= CSMODE_REV;
/* Handle the loop mode */
- loop_mode = fsl_espi_read_reg(mpc8xxx_spi, ESPI_SPMODE);
+ loop_mode = fsl_espi_read_reg(espi, ESPI_SPMODE);
loop_mode &= ~SPMODE_LOOP;
if (spi->mode & SPI_LOOP)
loop_mode |= SPMODE_LOOP;
- fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODE, loop_mode);
+ fsl_espi_write_reg(espi, ESPI_SPMODE, loop_mode);
fsl_espi_setup_transfer(spi, NULL);
- pm_runtime_mark_last_busy(mpc8xxx_spi->dev);
- pm_runtime_put_autosuspend(mpc8xxx_spi->dev);
+ pm_runtime_mark_last_busy(espi->dev);
+ pm_runtime_put_autosuspend(espi->dev);
return 0;
}
spi_set_ctldata(spi, NULL);
}
-static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
+static void fsl_espi_cpu_irq(struct fsl_espi *espi, u32 events)
{
- if (mspi->rx_len)
- fsl_espi_read_rx_fifo(mspi, events);
+ if (espi->rx_len)
+ fsl_espi_read_rx_fifo(espi, events);
- if (mspi->tx_len)
- fsl_espi_fill_tx_fifo(mspi, events);
+ if (espi->tx_len)
+ fsl_espi_fill_tx_fifo(espi, events);
- if (mspi->tx_len || mspi->rx_len)
+ if (espi->tx_len || espi->rx_len)
return;
/* we're done, but check for errors before returning */
- events = fsl_espi_read_reg(mspi, ESPI_SPIE);
+ events = fsl_espi_read_reg(espi, ESPI_SPIE);
if (!(events & SPIE_DON))
- dev_err(mspi->dev,
+ dev_err(espi->dev,
"Transfer done but SPIE_DON isn't set!\n");
if (SPIE_RXCNT(events) || SPIE_TXCNT(events) != FSL_ESPI_FIFO_SIZE)
- dev_err(mspi->dev, "Transfer done but rx/tx fifo's aren't empty!\n");
+ dev_err(espi->dev, "Transfer done but rx/tx fifo's aren't empty!\n");
- complete(&mspi->done);
+ complete(&espi->done);
}
static irqreturn_t fsl_espi_irq(s32 irq, void *context_data)
{
- struct mpc8xxx_spi *mspi = context_data;
+ struct fsl_espi *espi = context_data;
u32 events;
- spin_lock(&mspi->lock);
+ spin_lock(&espi->lock);
/* Get interrupt events(tx/rx) */
- events = fsl_espi_read_reg(mspi, ESPI_SPIE);
+ events = fsl_espi_read_reg(espi, ESPI_SPIE);
if (!events) {
- spin_unlock(&mspi->lock);
+ spin_unlock(&espi->lock);
return IRQ_NONE;
}
- dev_vdbg(mspi->dev, "%s: events %x\n", __func__, events);
+ dev_vdbg(espi->dev, "%s: events %x\n", __func__, events);
- fsl_espi_cpu_irq(mspi, events);
+ fsl_espi_cpu_irq(espi, events);
/* Clear the events */
- fsl_espi_write_reg(mspi, ESPI_SPIE, events);
+ fsl_espi_write_reg(espi, ESPI_SPIE, events);
- spin_unlock(&mspi->lock);
+ spin_unlock(&espi->lock);
return IRQ_HANDLED;
}
static int fsl_espi_runtime_suspend(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
- struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
+ struct fsl_espi *espi = spi_master_get_devdata(master);
u32 regval;
- regval = fsl_espi_read_reg(mpc8xxx_spi, ESPI_SPMODE);
+ regval = fsl_espi_read_reg(espi, ESPI_SPMODE);
regval &= ~SPMODE_ENABLE;
- fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODE, regval);
+ fsl_espi_write_reg(espi, ESPI_SPMODE, regval);
return 0;
}
static int fsl_espi_runtime_resume(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
- struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
+ struct fsl_espi *espi = spi_master_get_devdata(master);
u32 regval;
- regval = fsl_espi_read_reg(mpc8xxx_spi, ESPI_SPMODE);
+ regval = fsl_espi_read_reg(espi, ESPI_SPMODE);
regval |= SPMODE_ENABLE;
- fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODE, regval);
+ fsl_espi_write_reg(espi, ESPI_SPMODE, regval);
return 0;
}
static void fsl_espi_init_regs(struct device *dev, bool initial)
{
struct spi_master *master = dev_get_drvdata(dev);
- struct mpc8xxx_spi *mspi = spi_master_get_devdata(master);
+ struct fsl_espi *espi = spi_master_get_devdata(master);
struct device_node *nc;
u32 csmode, cs, prop;
int ret;
/* SPI controller initializations */
- fsl_espi_write_reg(mspi, ESPI_SPMODE, 0);
- fsl_espi_write_reg(mspi, ESPI_SPIM, 0);
- fsl_espi_write_reg(mspi, ESPI_SPCOM, 0);
- fsl_espi_write_reg(mspi, ESPI_SPIE, 0xffffffff);
+ fsl_espi_write_reg(espi, ESPI_SPMODE, 0);
+ fsl_espi_write_reg(espi, ESPI_SPIM, 0);
+ fsl_espi_write_reg(espi, ESPI_SPCOM, 0);
+ fsl_espi_write_reg(espi, ESPI_SPIE, 0xffffffff);
/* Init eSPI CS mode register */
for_each_available_child_of_node(master->dev.of_node, nc) {
csmode |= CSMODE_AFT(prop);
}
- fsl_espi_write_reg(mspi, ESPI_SPMODEx(cs), csmode);
+ fsl_espi_write_reg(espi, ESPI_SPMODEx(cs), csmode);
if (initial)
dev_info(dev, "cs=%u, init_csmode=0x%x\n", cs, csmode);
}
/* Enable SPI interface */
- fsl_espi_write_reg(mspi, ESPI_SPMODE, SPMODE_INIT_VAL | SPMODE_ENABLE);
+ fsl_espi_write_reg(espi, ESPI_SPMODE, SPMODE_INIT_VAL | SPMODE_ENABLE);
}
static int fsl_espi_probe(struct device *dev, struct resource *mem,
unsigned int irq, unsigned int num_cs)
{
struct spi_master *master;
- struct mpc8xxx_spi *mpc8xxx_spi;
+ struct fsl_espi *espi;
int ret;
- master = spi_alloc_master(dev, sizeof(struct mpc8xxx_spi));
+ master = spi_alloc_master(dev, sizeof(struct fsl_espi));
if (!master)
return -ENOMEM;
master->max_message_size = fsl_espi_max_message_size;
master->num_chipselect = num_cs;
- mpc8xxx_spi = spi_master_get_devdata(master);
- spin_lock_init(&mpc8xxx_spi->lock);
+ espi = spi_master_get_devdata(master);
+ spin_lock_init(&espi->lock);
- mpc8xxx_spi->dev = dev;
- mpc8xxx_spi->spibrg = fsl_get_sys_freq();
- if (mpc8xxx_spi->spibrg == -1) {
+ espi->dev = dev;
+ espi->spibrg = fsl_get_sys_freq();
+ if (espi->spibrg == -1) {
dev_err(dev, "Can't get sys frequency!\n");
ret = -EINVAL;
goto err_probe;
}
- init_completion(&mpc8xxx_spi->done);
+ init_completion(&espi->done);
- mpc8xxx_spi->local_buf =
- devm_kmalloc(dev, SPCOM_TRANLEN_MAX, GFP_KERNEL);
- if (!mpc8xxx_spi->local_buf) {
+ espi->local_buf = devm_kmalloc(dev, SPCOM_TRANLEN_MAX, GFP_KERNEL);
+ if (!espi->local_buf) {
ret = -ENOMEM;
goto err_probe;
}
- mpc8xxx_spi->reg_base = devm_ioremap_resource(dev, mem);
- if (IS_ERR(mpc8xxx_spi->reg_base)) {
- ret = PTR_ERR(mpc8xxx_spi->reg_base);
+ espi->reg_base = devm_ioremap_resource(dev, mem);
+ if (IS_ERR(espi->reg_base)) {
+ ret = PTR_ERR(espi->reg_base);
goto err_probe;
}
/* Register for SPI Interrupt */
- ret = devm_request_irq(dev, irq, fsl_espi_irq, 0, "fsl_espi",
- mpc8xxx_spi);
+ ret = devm_request_irq(dev, irq, fsl_espi_irq, 0, "fsl_espi", espi);
if (ret)
goto err_probe;
if (ret < 0)
goto err_pm;
- dev_info(dev, "at 0x%p (irq = %u)\n", mpc8xxx_spi->reg_base, irq);
+ dev_info(dev, "at 0x%p (irq = %u)\n", espi->reg_base, irq);
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
projects / linux-beck.git / commitdiff