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path: root/drivers/spi/spi-pxa2xx.c
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Diffstat (limited to 'drivers/spi/spi-pxa2xx.c')
-rw-r--r--drivers/spi/spi-pxa2xx.c193
1 files changed, 104 insertions, 89 deletions
diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index d84b893a64d7..e59c8b27b155 100644
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -328,7 +328,7 @@ static void lpss_ssp_setup(struct driver_data *drv_data)
__lpss_ssp_write_priv(drv_data, config->reg_cs_ctrl, value);
/* Enable multiblock DMA transfers */
- if (drv_data->master_info->enable_dma) {
+ if (drv_data->controller_info->enable_dma) {
__lpss_ssp_write_priv(drv_data, config->reg_ssp, 1);
if (config->reg_general >= 0) {
@@ -368,7 +368,7 @@ static void lpss_ssp_select_cs(struct spi_device *spi,
__lpss_ssp_write_priv(drv_data,
config->reg_cs_ctrl, value);
ndelay(1000000000 /
- (drv_data->master->max_speed_hz / 2));
+ (drv_data->controller->max_speed_hz / 2));
}
}
@@ -567,7 +567,7 @@ static int u32_reader(struct driver_data *drv_data)
static void reset_sccr1(struct driver_data *drv_data)
{
struct chip_data *chip =
- spi_get_ctldata(drv_data->master->cur_msg->spi);
+ spi_get_ctldata(drv_data->controller->cur_msg->spi);
u32 sccr1_reg;
sccr1_reg = pxa2xx_spi_read(drv_data, SSCR1) & ~drv_data->int_cr1;
@@ -599,8 +599,8 @@ static void int_error_stop(struct driver_data *drv_data, const char* msg)
dev_err(&drv_data->pdev->dev, "%s\n", msg);
- drv_data->master->cur_msg->status = -EIO;
- spi_finalize_current_transfer(drv_data->master);
+ drv_data->controller->cur_msg->status = -EIO;
+ spi_finalize_current_transfer(drv_data->controller);
}
static void int_transfer_complete(struct driver_data *drv_data)
@@ -611,7 +611,7 @@ static void int_transfer_complete(struct driver_data *drv_data)
if (!pxa25x_ssp_comp(drv_data))
pxa2xx_spi_write(drv_data, SSTO, 0);
- spi_finalize_current_transfer(drv_data->master);
+ spi_finalize_current_transfer(drv_data->controller);
}
static irqreturn_t interrupt_transfer(struct driver_data *drv_data)
@@ -747,7 +747,7 @@ static irqreturn_t ssp_int(int irq, void *dev_id)
pxa2xx_spi_write(drv_data, SSCR1, sccr1_reg & ~drv_data->int_cr1);
pxa2xx_spi_write(drv_data, SSCR1, sccr1_reg);
- if (!drv_data->master->cur_msg) {
+ if (!drv_data->controller->cur_msg) {
handle_bad_msg(drv_data);
/* Never fail */
return IRQ_HANDLED;
@@ -879,22 +879,26 @@ static unsigned int quark_x1000_get_clk_div(int rate, u32 *dds)
static unsigned int ssp_get_clk_div(struct driver_data *drv_data, int rate)
{
- unsigned long ssp_clk = drv_data->master->max_speed_hz;
+ unsigned long ssp_clk = drv_data->controller->max_speed_hz;
const struct ssp_device *ssp = drv_data->ssp;
rate = min_t(int, ssp_clk, rate);
+ /*
+ * Calculate the divisor for the SCR (Serial Clock Rate), avoiding
+ * that the SSP transmission rate can be greater than the device rate
+ */
if (ssp->type == PXA25x_SSP || ssp->type == CE4100_SSP)
- return (ssp_clk / (2 * rate) - 1) & 0xff;
+ return (DIV_ROUND_UP(ssp_clk, 2 * rate) - 1) & 0xff;
else
- return (ssp_clk / rate - 1) & 0xfff;
+ return (DIV_ROUND_UP(ssp_clk, rate) - 1) & 0xfff;
}
static unsigned int pxa2xx_ssp_get_clk_div(struct driver_data *drv_data,
int rate)
{
struct chip_data *chip =
- spi_get_ctldata(drv_data->master->cur_msg->spi);
+ spi_get_ctldata(drv_data->controller->cur_msg->spi);
unsigned int clk_div;
switch (drv_data->ssp_type) {
@@ -908,7 +912,7 @@ static unsigned int pxa2xx_ssp_get_clk_div(struct driver_data *drv_data,
return clk_div << 8;
}
-static bool pxa2xx_spi_can_dma(struct spi_controller *master,
+static bool pxa2xx_spi_can_dma(struct spi_controller *controller,
struct spi_device *spi,
struct spi_transfer *xfer)
{
@@ -919,13 +923,13 @@ static bool pxa2xx_spi_can_dma(struct spi_controller *master,
xfer->len >= chip->dma_burst_size;
}
-static int pxa2xx_spi_transfer_one(struct spi_controller *master,
+static int pxa2xx_spi_transfer_one(struct spi_controller *controller,
struct spi_device *spi,
struct spi_transfer *transfer)
{
- struct driver_data *drv_data = spi_controller_get_devdata(master);
- struct spi_message *message = master->cur_msg;
- struct chip_data *chip = spi_get_ctldata(message->spi);
+ struct driver_data *drv_data = spi_controller_get_devdata(controller);
+ struct spi_message *message = controller->cur_msg;
+ struct chip_data *chip = spi_get_ctldata(spi);
u32 dma_thresh = chip->dma_threshold;
u32 dma_burst = chip->dma_burst_size;
u32 change_mask = pxa2xx_spi_get_ssrc1_change_mask(drv_data);
@@ -943,21 +947,21 @@ static int pxa2xx_spi_transfer_one(struct spi_controller *master,
/* reject already-mapped transfers; PIO won't always work */
if (message->is_dma_mapped
|| transfer->rx_dma || transfer->tx_dma) {
- dev_err(&drv_data->pdev->dev,
+ dev_err(&spi->dev,
"Mapped transfer length of %u is greater than %d\n",
transfer->len, MAX_DMA_LEN);
return -EINVAL;
}
/* warn ... we force this to PIO mode */
- dev_warn_ratelimited(&message->spi->dev,
+ dev_warn_ratelimited(&spi->dev,
"DMA disabled for transfer length %ld greater than %d\n",
(long)transfer->len, MAX_DMA_LEN);
}
/* Setup the transfer state based on the type of transfer */
if (pxa2xx_spi_flush(drv_data) == 0) {
- dev_err(&drv_data->pdev->dev, "Flush failed\n");
+ dev_err(&spi->dev, "Flush failed\n");
return -EIO;
}
drv_data->n_bytes = chip->n_bytes;
@@ -999,16 +1003,16 @@ static int pxa2xx_spi_transfer_one(struct spi_controller *master,
*/
if (chip->enable_dma) {
if (pxa2xx_spi_set_dma_burst_and_threshold(chip,
- message->spi,
+ spi,
bits, &dma_burst,
&dma_thresh))
- dev_warn_ratelimited(&message->spi->dev,
+ dev_warn_ratelimited(&spi->dev,
"DMA burst size reduced to match bits_per_word\n");
}
- dma_mapped = master->can_dma &&
- master->can_dma(master, message->spi, transfer) &&
- master->cur_msg_mapped;
+ dma_mapped = controller->can_dma &&
+ controller->can_dma(controller, spi, transfer) &&
+ controller->cur_msg_mapped;
if (dma_mapped) {
/* Ensure we have the correct interrupt handler */
@@ -1035,13 +1039,13 @@ static int pxa2xx_spi_transfer_one(struct spi_controller *master,
/* NOTE: PXA25x_SSP _could_ use external clocking ... */
cr0 = pxa2xx_configure_sscr0(drv_data, clk_div, bits);
if (!pxa25x_ssp_comp(drv_data))
- dev_dbg(&message->spi->dev, "%u Hz actual, %s\n",
- master->max_speed_hz
+ dev_dbg(&spi->dev, "%u Hz actual, %s\n",
+ controller->max_speed_hz
/ (1 + ((cr0 & SSCR0_SCR(0xfff)) >> 8)),
dma_mapped ? "DMA" : "PIO");
else
- dev_dbg(&message->spi->dev, "%u Hz actual, %s\n",
- master->max_speed_hz / 2
+ dev_dbg(&spi->dev, "%u Hz actual, %s\n",
+ controller->max_speed_hz / 2
/ (1 + ((cr0 & SSCR0_SCR(0x0ff)) >> 8)),
dma_mapped ? "DMA" : "PIO");
@@ -1092,7 +1096,7 @@ static int pxa2xx_spi_transfer_one(struct spi_controller *master,
}
}
- if (spi_controller_is_slave(master)) {
+ if (spi_controller_is_slave(controller)) {
while (drv_data->write(drv_data))
;
if (drv_data->gpiod_ready) {
@@ -1111,9 +1115,9 @@ static int pxa2xx_spi_transfer_one(struct spi_controller *master,
return 1;
}
-static int pxa2xx_spi_slave_abort(struct spi_master *master)
+static int pxa2xx_spi_slave_abort(struct spi_controller *controller)
{
- struct driver_data *drv_data = spi_controller_get_devdata(master);
+ struct driver_data *drv_data = spi_controller_get_devdata(controller);
/* Stop and reset SSP */
write_SSSR_CS(drv_data, drv_data->clear_sr);
@@ -1126,16 +1130,16 @@ static int pxa2xx_spi_slave_abort(struct spi_master *master)
dev_dbg(&drv_data->pdev->dev, "transfer aborted\n");
- drv_data->master->cur_msg->status = -EINTR;
- spi_finalize_current_transfer(drv_data->master);
+ drv_data->controller->cur_msg->status = -EINTR;
+ spi_finalize_current_transfer(drv_data->controller);
return 0;
}
-static void pxa2xx_spi_handle_err(struct spi_controller *master,
+static void pxa2xx_spi_handle_err(struct spi_controller *controller,
struct spi_message *msg)
{
- struct driver_data *drv_data = spi_controller_get_devdata(master);
+ struct driver_data *drv_data = spi_controller_get_devdata(controller);
/* Disable the SSP */
pxa2xx_spi_write(drv_data, SSCR0,
@@ -1159,9 +1163,9 @@ static void pxa2xx_spi_handle_err(struct spi_controller *master,
pxa2xx_spi_dma_stop(drv_data);
}
-static int pxa2xx_spi_unprepare_transfer(struct spi_controller *master)
+static int pxa2xx_spi_unprepare_transfer(struct spi_controller *controller)
{
- struct driver_data *drv_data = spi_controller_get_devdata(master);
+ struct driver_data *drv_data = spi_controller_get_devdata(controller);
/* Disable the SSP now */
pxa2xx_spi_write(drv_data, SSCR0,
@@ -1260,7 +1264,7 @@ static int setup(struct spi_device *spi)
break;
default:
tx_hi_thres = 0;
- if (spi_controller_is_slave(drv_data->master)) {
+ if (spi_controller_is_slave(drv_data->controller)) {
tx_thres = 1;
rx_thres = 2;
} else {
@@ -1287,7 +1291,7 @@ static int setup(struct spi_device *spi)
chip->frm = spi->chip_select;
}
- chip->enable_dma = drv_data->master_info->enable_dma;
+ chip->enable_dma = drv_data->controller_info->enable_dma;
chip->timeout = TIMOUT_DFLT;
}
@@ -1310,7 +1314,7 @@ static int setup(struct spi_device *spi)
if (chip_info->enable_loopback)
chip->cr1 = SSCR1_LBM;
}
- if (spi_controller_is_slave(drv_data->master)) {
+ if (spi_controller_is_slave(drv_data->controller)) {
chip->cr1 |= SSCR1_SCFR;
chip->cr1 |= SSCR1_SCLKDIR;
chip->cr1 |= SSCR1_SFRMDIR;
@@ -1333,6 +1337,9 @@ static int setup(struct spi_device *spi)
dev_warn(&spi->dev,
"in setup: DMA burst size reduced to match bits_per_word\n");
}
+ dev_dbg(&spi->dev,
+ "in setup: DMA burst size set to %u\n",
+ chip->dma_burst_size);
}
switch (drv_data->ssp_type) {
@@ -1451,6 +1458,10 @@ static const struct pci_device_id pxa2xx_spi_pci_compound_match[] = {
{ PCI_VDEVICE(INTEL, 0xa32a), LPSS_CNL_SSP },
{ PCI_VDEVICE(INTEL, 0xa32b), LPSS_CNL_SSP },
{ PCI_VDEVICE(INTEL, 0xa37b), LPSS_CNL_SSP },
+ /* CML-LP */
+ { PCI_VDEVICE(INTEL, 0x02aa), LPSS_CNL_SSP },
+ { PCI_VDEVICE(INTEL, 0x02ab), LPSS_CNL_SSP },
+ { PCI_VDEVICE(INTEL, 0x02fb), LPSS_CNL_SSP },
{ },
};
@@ -1497,10 +1508,10 @@ static bool pxa2xx_spi_idma_filter(struct dma_chan *chan, void *param)
#endif /* CONFIG_PCI */
-static struct pxa2xx_spi_master *
+static struct pxa2xx_spi_controller *
pxa2xx_spi_init_pdata(struct platform_device *pdev)
{
- struct pxa2xx_spi_master *pdata;
+ struct pxa2xx_spi_controller *pdata;
struct acpi_device *adev;
struct ssp_device *ssp;
struct resource *res;
@@ -1564,14 +1575,15 @@ pxa2xx_spi_init_pdata(struct platform_device *pdev)
pdata->is_slave = of_property_read_bool(pdev->dev.of_node, "spi-slave");
pdata->num_chipselect = 1;
pdata->enable_dma = true;
+ pdata->dma_burst_size = 1;
return pdata;
}
-static int pxa2xx_spi_fw_translate_cs(struct spi_controller *master,
+static int pxa2xx_spi_fw_translate_cs(struct spi_controller *controller,
unsigned int cs)
{
- struct driver_data *drv_data = spi_controller_get_devdata(master);
+ struct driver_data *drv_data = spi_controller_get_devdata(controller);
if (has_acpi_companion(&drv_data->pdev->dev)) {
switch (drv_data->ssp_type) {
@@ -1595,8 +1607,8 @@ static int pxa2xx_spi_fw_translate_cs(struct spi_controller *master,
static int pxa2xx_spi_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
- struct pxa2xx_spi_master *platform_info;
- struct spi_controller *master;
+ struct pxa2xx_spi_controller *platform_info;
+ struct spi_controller *controller;
struct driver_data *drv_data;
struct ssp_device *ssp;
const struct lpss_config *config;
@@ -1622,37 +1634,37 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
}
if (platform_info->is_slave)
- master = spi_alloc_slave(dev, sizeof(struct driver_data));
+ controller = spi_alloc_slave(dev, sizeof(struct driver_data));
else
- master = spi_alloc_master(dev, sizeof(struct driver_data));
+ controller = spi_alloc_master(dev, sizeof(struct driver_data));
- if (!master) {
- dev_err(&pdev->dev, "cannot alloc spi_master\n");
+ if (!controller) {
+ dev_err(&pdev->dev, "cannot alloc spi_controller\n");
pxa_ssp_free(ssp);
return -ENOMEM;
}
- drv_data = spi_controller_get_devdata(master);
- drv_data->master = master;
- drv_data->master_info = platform_info;
+ drv_data = spi_controller_get_devdata(controller);
+ drv_data->controller = controller;
+ drv_data->controller_info = platform_info;
drv_data->pdev = pdev;
drv_data->ssp = ssp;
- master->dev.of_node = pdev->dev.of_node;
+ controller->dev.of_node = pdev->dev.of_node;
/* the spi->mode bits understood by this driver: */
- master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP;
-
- master->bus_num = ssp->port_id;
- master->dma_alignment = DMA_ALIGNMENT;
- master->cleanup = cleanup;
- master->setup = setup;
- master->set_cs = pxa2xx_spi_set_cs;
- master->transfer_one = pxa2xx_spi_transfer_one;
- master->slave_abort = pxa2xx_spi_slave_abort;
- master->handle_err = pxa2xx_spi_handle_err;
- master->unprepare_transfer_hardware = pxa2xx_spi_unprepare_transfer;
- master->fw_translate_cs = pxa2xx_spi_fw_translate_cs;
- master->auto_runtime_pm = true;
- master->flags = SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX;
+ controller->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP;
+
+ controller->bus_num = ssp->port_id;
+ controller->dma_alignment = DMA_ALIGNMENT;
+ controller->cleanup = cleanup;
+ controller->setup = setup;
+ controller->set_cs = pxa2xx_spi_set_cs;
+ controller->transfer_one = pxa2xx_spi_transfer_one;
+ controller->slave_abort = pxa2xx_spi_slave_abort;
+ controller->handle_err = pxa2xx_spi_handle_err;
+ controller->unprepare_transfer_hardware = pxa2xx_spi_unprepare_transfer;
+ controller->fw_translate_cs = pxa2xx_spi_fw_translate_cs;
+ controller->auto_runtime_pm = true;
+ controller->flags = SPI_CONTROLLER_MUST_RX | SPI_CONTROLLER_MUST_TX;
drv_data->ssp_type = ssp->type;
@@ -1661,10 +1673,10 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
if (pxa25x_ssp_comp(drv_data)) {
switch (drv_data->ssp_type) {
case QUARK_X1000_SSP:
- master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
+ controller->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
break;
default:
- master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16);
+ controller->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16);
break;
}
@@ -1673,7 +1685,7 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
drv_data->clear_sr = SSSR_ROR;
drv_data->mask_sr = SSSR_RFS | SSSR_TFS | SSSR_ROR;
} else {
- master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
+ controller->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
drv_data->int_cr1 = SSCR1_TIE | SSCR1_RIE | SSCR1_TINTE;
drv_data->dma_cr1 = DEFAULT_DMA_CR1;
drv_data->clear_sr = SSSR_ROR | SSSR_TINT;
@@ -1685,17 +1697,18 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
drv_data);
if (status < 0) {
dev_err(&pdev->dev, "cannot get IRQ %d\n", ssp->irq);
- goto out_error_master_alloc;
+ goto out_error_controller_alloc;
}
/* Setup DMA if requested */
if (platform_info->enable_dma) {
status = pxa2xx_spi_dma_setup(drv_data);
if (status) {
- dev_dbg(dev, "no DMA channels available, using PIO\n");
+ dev_warn(dev, "no DMA channels available, using PIO\n");
platform_info->enable_dma = false;
} else {
- master->can_dma = pxa2xx_spi_can_dma;
+ controller->can_dma = pxa2xx_spi_can_dma;
+ controller->max_dma_len = MAX_DMA_LEN;
}
}
@@ -1704,7 +1717,7 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
if (status)
goto out_error_dma_irq_alloc;
- master->max_speed_hz = clk_get_rate(ssp->clk);
+ controller->max_speed_hz = clk_get_rate(ssp->clk);
/* Load default SSP configuration */
pxa2xx_spi_write(drv_data, SSCR0, 0);
@@ -1727,7 +1740,7 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
break;
default:
- if (spi_controller_is_slave(master)) {
+ if (spi_controller_is_slave(controller)) {
tmp = SSCR1_SCFR |
SSCR1_SCLKDIR |
SSCR1_SFRMDIR |
@@ -1740,7 +1753,7 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
}
pxa2xx_spi_write(drv_data, SSCR1, tmp);
tmp = SSCR0_Motorola | SSCR0_DataSize(8);
- if (!spi_controller_is_slave(master))
+ if (!spi_controller_is_slave(controller))
tmp |= SSCR0_SCR(2);
pxa2xx_spi_write(drv_data, SSCR0, tmp);
break;
@@ -1765,24 +1778,24 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
platform_info->num_chipselect = config->cs_num;
}
}
- master->num_chipselect = platform_info->num_chipselect;
+ controller->num_chipselect = platform_info->num_chipselect;
count = gpiod_count(&pdev->dev, "cs");
if (count > 0) {
int i;
- master->num_chipselect = max_t(int, count,
- master->num_chipselect);
+ controller->num_chipselect = max_t(int, count,
+ controller->num_chipselect);
drv_data->cs_gpiods = devm_kcalloc(&pdev->dev,
- master->num_chipselect, sizeof(struct gpio_desc *),
+ controller->num_chipselect, sizeof(struct gpio_desc *),
GFP_KERNEL);
if (!drv_data->cs_gpiods) {
status = -ENOMEM;
goto out_error_clock_enabled;
}
- for (i = 0; i < master->num_chipselect; i++) {
+ for (i = 0; i < controller->num_chipselect; i++) {
struct gpio_desc *gpiod;
gpiod = devm_gpiod_get_index(dev, "cs", i, GPIOD_ASIS);
@@ -1815,9 +1828,9 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
/* Register with the SPI framework */
platform_set_drvdata(pdev, drv_data);
- status = devm_spi_register_controller(&pdev->dev, master);
+ status = devm_spi_register_controller(&pdev->dev, controller);
if (status != 0) {
- dev_err(&pdev->dev, "problem registering spi master\n");
+ dev_err(&pdev->dev, "problem registering spi controller\n");
goto out_error_clock_enabled;
}
@@ -1832,8 +1845,8 @@ out_error_dma_irq_alloc:
pxa2xx_spi_dma_release(drv_data);
free_irq(ssp->irq, drv_data);
-out_error_master_alloc:
- spi_controller_put(master);
+out_error_controller_alloc:
+ spi_controller_put(controller);
pxa_ssp_free(ssp);
return status;
}
@@ -1854,7 +1867,7 @@ static int pxa2xx_spi_remove(struct platform_device *pdev)
clk_disable_unprepare(ssp->clk);
/* Release DMA */
- if (drv_data->master_info->enable_dma)
+ if (drv_data->controller_info->enable_dma)
pxa2xx_spi_dma_release(drv_data);
pm_runtime_put_noidle(&pdev->dev);
@@ -1876,7 +1889,7 @@ static int pxa2xx_spi_suspend(struct device *dev)
struct ssp_device *ssp = drv_data->ssp;
int status;
- status = spi_controller_suspend(drv_data->master);
+ status = spi_controller_suspend(drv_data->controller);
if (status != 0)
return status;
pxa2xx_spi_write(drv_data, SSCR0, 0);
@@ -1901,7 +1914,7 @@ static int pxa2xx_spi_resume(struct device *dev)
}
/* Start the queue running */
- return spi_controller_resume(drv_data->master);
+ return spi_controller_resume(drv_data->controller);
}
#endif
@@ -1952,3 +1965,5 @@ static void __exit pxa2xx_spi_exit(void)
platform_driver_unregister(&driver);
}
module_exit(pxa2xx_spi_exit);
+
+MODULE_SOFTDEP("pre: dw_dmac");
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