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path: root/drivers/spi/spi-tegra20-slink.c
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Diffstat (limited to 'drivers/spi/spi-tegra20-slink.c')
-rw-r--r--drivers/spi/spi-tegra20-slink.c84
1 files changed, 14 insertions, 70 deletions
diff --git a/drivers/spi/spi-tegra20-slink.c b/drivers/spi/spi-tegra20-slink.c
index a829563f471..3faf88d003d 100644
--- a/drivers/spi/spi-tegra20-slink.c
+++ b/drivers/spi/spi-tegra20-slink.c
@@ -34,7 +34,6 @@
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/spi/spi.h>
-#include <linux/spi/spi-tegra.h>
#include <linux/clk/tegra.h>
#define SLINK_COMMAND 0x000
@@ -189,7 +188,6 @@ struct tegra_slink_data {
unsigned dma_buf_size;
unsigned max_buf_size;
bool is_curr_dma_xfer;
- bool is_hw_based_cs;
struct completion rx_dma_complete;
struct completion tx_dma_complete;
@@ -375,9 +373,6 @@ static unsigned int tegra_slink_read_rx_fifo_to_client_rxbuf(
tspi->cur_rx_pos += tspi->curr_dma_words * tspi->bytes_per_word;
read_words += tspi->curr_dma_words;
} else {
- unsigned int bits_per_word;
-
- bits_per_word = t->bits_per_word;
for (count = 0; count < rx_full_count; count++) {
x = tegra_slink_readl(tspi, SLINK_RX_FIFO);
for (i = 0; (i < tspi->bytes_per_word); i++)
@@ -720,7 +715,6 @@ static int tegra_slink_start_transfer_one(struct spi_device *spi,
u8 bits_per_word;
unsigned total_fifo_words;
int ret;
- struct tegra_spi_device_controller_data *cdata = spi->controller_data;
unsigned long command;
unsigned long command2;
@@ -743,39 +737,11 @@ static int tegra_slink_start_transfer_one(struct spi_device *spi,
command = tspi->def_command_reg;
command |= SLINK_BIT_LENGTH(bits_per_word - 1);
+ command |= SLINK_CS_SW | SLINK_CS_VALUE;
command2 = tspi->def_command2_reg;
command2 |= SLINK_SS_EN_CS(spi->chip_select);
- /* possibly use the hw based chip select */
- tspi->is_hw_based_cs = false;
- if (cdata && cdata->is_hw_based_cs && is_single_xfer &&
- ((tspi->curr_dma_words * tspi->bytes_per_word) ==
- (t->len - tspi->cur_pos))) {
- int setup_count;
- int sts2;
-
- setup_count = cdata->cs_setup_clk_count >> 1;
- setup_count = max(setup_count, 3);
- command2 |= SLINK_SS_SETUP(setup_count);
- if (tspi->chip_data->cs_hold_time) {
- int hold_count;
-
- hold_count = cdata->cs_hold_clk_count;
- hold_count = max(hold_count, 0xF);
- sts2 = tegra_slink_readl(tspi, SLINK_STATUS2);
- sts2 &= ~SLINK_SS_HOLD_TIME(0xF);
- sts2 |= SLINK_SS_HOLD_TIME(hold_count);
- tegra_slink_writel(tspi, sts2, SLINK_STATUS2);
- }
- tspi->is_hw_based_cs = true;
- }
-
- if (tspi->is_hw_based_cs)
- command &= ~SLINK_CS_SW;
- else
- command |= SLINK_CS_SW | SLINK_CS_VALUE;
-
command &= ~SLINK_MODES;
if (spi->mode & SPI_CPHA)
command |= SLINK_CK_SDA;
@@ -1065,36 +1031,25 @@ static irqreturn_t tegra_slink_isr(int irq, void *context_data)
return IRQ_WAKE_THREAD;
}
-static struct tegra_spi_platform_data *tegra_slink_parse_dt(
- struct platform_device *pdev)
+static void tegra_slink_parse_dt(struct tegra_slink_data *tspi)
{
- struct tegra_spi_platform_data *pdata;
- const unsigned int *prop;
- struct device_node *np = pdev->dev.of_node;
+ struct device_node *np = tspi->dev->of_node;
u32 of_dma[2];
- pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
- if (!pdata) {
- dev_err(&pdev->dev, "Memory alloc for pdata failed\n");
- return NULL;
- }
-
if (of_property_read_u32_array(np, "nvidia,dma-request-selector",
of_dma, 2) >= 0)
- pdata->dma_req_sel = of_dma[1];
-
- prop = of_get_property(np, "spi-max-frequency", NULL);
- if (prop)
- pdata->spi_max_frequency = be32_to_cpup(prop);
+ tspi->dma_req_sel = of_dma[1];
- return pdata;
+ if (of_property_read_u32(np, "spi-max-frequency",
+ &tspi->spi_max_frequency))
+ tspi->spi_max_frequency = 25000000; /* 25MHz */
}
-const struct tegra_slink_chip_data tegra30_spi_cdata = {
+static const struct tegra_slink_chip_data tegra30_spi_cdata = {
.cs_hold_time = true,
};
-const struct tegra_slink_chip_data tegra20_spi_cdata = {
+static const struct tegra_slink_chip_data tegra20_spi_cdata = {
.cs_hold_time = false,
};
@@ -1110,27 +1065,16 @@ static int tegra_slink_probe(struct platform_device *pdev)
struct spi_master *master;
struct tegra_slink_data *tspi;
struct resource *r;
- struct tegra_spi_platform_data *pdata = pdev->dev.platform_data;
int ret, spi_irq;
const struct tegra_slink_chip_data *cdata = NULL;
const struct of_device_id *match;
- match = of_match_device(of_match_ptr(tegra_slink_of_match), &pdev->dev);
+ match = of_match_device(tegra_slink_of_match, &pdev->dev);
if (!match) {
dev_err(&pdev->dev, "Error: No device match found\n");
return -ENODEV;
}
cdata = match->data;
- if (!pdata && pdev->dev.of_node)
- pdata = tegra_slink_parse_dt(pdev);
-
- if (!pdata) {
- dev_err(&pdev->dev, "No platform data, exiting\n");
- return -ENODEV;
- }
-
- if (!pdata->spi_max_frequency)
- pdata->spi_max_frequency = 25000000; /* 25MHz */
master = spi_alloc_master(&pdev->dev, sizeof(*tspi));
if (!master) {
@@ -1148,11 +1092,12 @@ static int tegra_slink_probe(struct platform_device *pdev)
dev_set_drvdata(&pdev->dev, master);
tspi = spi_master_get_devdata(master);
tspi->master = master;
- tspi->dma_req_sel = pdata->dma_req_sel;
tspi->dev = &pdev->dev;
tspi->chip_data = cdata;
spin_lock_init(&tspi->lock);
+ tegra_slink_parse_dt(tspi);
+
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r) {
dev_err(&pdev->dev, "No IO memory resource\n");
@@ -1186,9 +1131,8 @@ static int tegra_slink_probe(struct platform_device *pdev)
tspi->max_buf_size = SLINK_FIFO_DEPTH << 2;
tspi->dma_buf_size = DEFAULT_SPI_DMA_BUF_LEN;
- tspi->spi_max_frequency = pdata->spi_max_frequency;
- if (pdata->dma_req_sel) {
+ if (tspi->dma_req_sel) {
ret = tegra_slink_init_dma_param(tspi, true);
if (ret < 0) {
dev_err(&pdev->dev, "RxDma Init failed, err %d\n", ret);
@@ -1331,7 +1275,7 @@ static struct platform_driver tegra_slink_driver = {
.name = "spi-tegra-slink",
.owner = THIS_MODULE,
.pm = &slink_pm_ops,
- .of_match_table = of_match_ptr(tegra_slink_of_match),
+ .of_match_table = tegra_slink_of_match,
},
.probe = tegra_slink_probe,
.remove = tegra_slink_remove,
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-15 18:09:15 +0000