aboutsummaryrefslogtreecommitdiff
path: root/drivers/spi/spi-sh-hspi.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/spi/spi-sh-hspi.c')
-rw-r--r--drivers/spi/spi-sh-hspi.c139
1 files changed, 69 insertions, 70 deletions
diff --git a/drivers/spi/spi-sh-hspi.c b/drivers/spi/spi-sh-hspi.c
index 796c077ef43..c8e795ef2e1 100644
--- a/drivers/spi/spi-sh-hspi.c
+++ b/drivers/spi/spi-sh-hspi.c
@@ -46,8 +46,6 @@
/* SPSR */
#define RXFL (1 << 2)
-#define hspi2info(h) (h->dev->platform_data)
-
struct hspi_priv {
void __iomem *addr;
struct spi_master *master;
@@ -68,6 +66,16 @@ static u32 hspi_read(struct hspi_priv *hspi, int reg)
return ioread32(hspi->addr + reg);
}
+static void hspi_bit_set(struct hspi_priv *hspi, int reg, u32 mask, u32 set)
+{
+ u32 val = hspi_read(hspi, reg);
+
+ val &= ~mask;
+ val |= set & mask;
+
+ hspi_write(hspi, reg, val);
+}
+
/*
* transfer function
*/
@@ -79,7 +87,7 @@ static int hspi_status_check_timeout(struct hspi_priv *hspi, u32 mask, u32 val)
if ((mask & hspi_read(hspi, SPSR)) == val)
return 0;
- msleep(20);
+ udelay(10);
}
dev_err(hspi->dev, "timeout\n");
@@ -89,20 +97,12 @@ static int hspi_status_check_timeout(struct hspi_priv *hspi, u32 mask, u32 val)
/*
* spi master function
*/
-static int hspi_prepare_transfer(struct spi_master *master)
-{
- struct hspi_priv *hspi = spi_master_get_devdata(master);
-
- pm_runtime_get_sync(hspi->dev);
- return 0;
-}
-static int hspi_unprepare_transfer(struct spi_master *master)
+#define hspi_hw_cs_enable(hspi) hspi_hw_cs_ctrl(hspi, 0)
+#define hspi_hw_cs_disable(hspi) hspi_hw_cs_ctrl(hspi, 1)
+static void hspi_hw_cs_ctrl(struct hspi_priv *hspi, int hi)
{
- struct hspi_priv *hspi = spi_master_get_devdata(master);
-
- pm_runtime_put_sync(hspi->dev);
- return 0;
+ hspi_bit_set(hspi, SPSCR, (1 << 6), (hi) << 6);
}
static void hspi_hw_setup(struct hspi_priv *hspi,
@@ -111,14 +111,9 @@ static void hspi_hw_setup(struct hspi_priv *hspi,
{
struct spi_device *spi = msg->spi;
struct device *dev = hspi->dev;
- u32 target_rate;
u32 spcr, idiv_clk;
u32 rate, best_rate, min, tmp;
- target_rate = t ? t->speed_hz : 0;
- if (!target_rate)
- target_rate = spi->max_speed_hz;
-
/*
* find best IDIV/CLKCx settings
*/
@@ -135,10 +130,10 @@ static void hspi_hw_setup(struct hspi_priv *hspi,
rate /= 16;
/* CLKCx calculation */
- rate /= (((idiv_clk & 0x1F) + 1) * 2) ;
+ rate /= (((idiv_clk & 0x1F) + 1) * 2);
/* save best settings */
- tmp = abs(target_rate - rate);
+ tmp = abs(t->speed_hz - rate);
if (tmp < min) {
min = tmp;
spcr = idiv_clk;
@@ -151,11 +146,11 @@ static void hspi_hw_setup(struct hspi_priv *hspi,
if (spi->mode & SPI_CPOL)
spcr |= 1 << 6;
- dev_dbg(dev, "speed %d/%d\n", target_rate, best_rate);
+ dev_dbg(dev, "speed %d/%d\n", t->speed_hz, best_rate);
hspi_write(hspi, SPCR, spcr);
hspi_write(hspi, SPSR, 0x0);
- hspi_write(hspi, SPSCR, 0x1); /* master mode */
+ hspi_write(hspi, SPSCR, 0x21); /* master mode / CS control */
}
static int hspi_transfer_one_message(struct spi_master *master,
@@ -166,12 +161,21 @@ static int hspi_transfer_one_message(struct spi_master *master,
u32 tx;
u32 rx;
int ret, i;
+ unsigned int cs_change;
+ const int nsecs = 50;
dev_dbg(hspi->dev, "%s\n", __func__);
+ cs_change = 1;
ret = 0;
list_for_each_entry(t, &msg->transfers, transfer_list) {
- hspi_hw_setup(hspi, msg, t);
+
+ if (cs_change) {
+ hspi_hw_setup(hspi, msg, t);
+ hspi_hw_cs_enable(hspi);
+ ndelay(nsecs);
+ }
+ cs_change = t->cs_change;
for (i = 0; i < t->len; i++) {
@@ -186,7 +190,7 @@ static int hspi_transfer_one_message(struct spi_master *master,
hspi_write(hspi, SPTBR, tx);
- /* wait recive */
+ /* wait receive */
ret = hspi_status_check_timeout(hspi, 0x4, 0x4);
if (ret < 0)
break;
@@ -198,38 +202,28 @@ static int hspi_transfer_one_message(struct spi_master *master,
}
msg->actual_length += t->len;
+
+ if (t->delay_usecs)
+ udelay(t->delay_usecs);
+
+ if (cs_change) {
+ ndelay(nsecs);
+ hspi_hw_cs_disable(hspi);
+ ndelay(nsecs);
+ }
}
msg->status = ret;
+ if (!cs_change) {
+ ndelay(nsecs);
+ hspi_hw_cs_disable(hspi);
+ }
spi_finalize_current_message(master);
return ret;
}
-static int hspi_setup(struct spi_device *spi)
-{
- struct hspi_priv *hspi = spi_master_get_devdata(spi->master);
- struct device *dev = hspi->dev;
-
- if (8 != spi->bits_per_word) {
- dev_err(dev, "bits_per_word should be 8\n");
- return -EIO;
- }
-
- dev_dbg(dev, "%s setup\n", spi->modalias);
-
- return 0;
-}
-
-static void hspi_cleanup(struct spi_device *spi)
-{
- struct hspi_priv *hspi = spi_master_get_devdata(spi->master);
- struct device *dev = hspi->dev;
-
- dev_dbg(dev, "%s cleanup\n", spi->modalias);
-}
-
-static int __devinit hspi_probe(struct platform_device *pdev)
+static int hspi_probe(struct platform_device *pdev)
{
struct resource *res;
struct spi_master *master;
@@ -250,15 +244,15 @@ static int __devinit hspi_probe(struct platform_device *pdev)
return -ENOMEM;
}
- clk = clk_get(NULL, "shyway_clk");
- if (!clk) {
- dev_err(&pdev->dev, "shyway_clk is required\n");
+ clk = clk_get(&pdev->dev, NULL);
+ if (IS_ERR(clk)) {
+ dev_err(&pdev->dev, "couldn't get clock\n");
ret = -EINVAL;
goto error0;
}
hspi = spi_master_get_devdata(master);
- dev_set_drvdata(&pdev->dev, hspi);
+ platform_set_drvdata(pdev, hspi);
/* init hspi */
hspi->master = master;
@@ -272,26 +266,25 @@ static int __devinit hspi_probe(struct platform_device *pdev)
goto error1;
}
- master->num_chipselect = 1;
+ pm_runtime_enable(&pdev->dev);
+
master->bus_num = pdev->id;
- master->setup = hspi_setup;
- master->cleanup = hspi_cleanup;
master->mode_bits = SPI_CPOL | SPI_CPHA;
- master->prepare_transfer_hardware = hspi_prepare_transfer;
+ master->dev.of_node = pdev->dev.of_node;
+ master->auto_runtime_pm = true;
master->transfer_one_message = hspi_transfer_one_message;
- master->unprepare_transfer_hardware = hspi_unprepare_transfer;
- ret = spi_register_master(master);
+ master->bits_per_word_mask = SPI_BPW_MASK(8);
+
+ ret = devm_spi_register_master(&pdev->dev, master);
if (ret < 0) {
dev_err(&pdev->dev, "spi_register_master error.\n");
- goto error1;
+ goto error2;
}
- pm_runtime_enable(&pdev->dev);
-
- dev_info(&pdev->dev, "probed\n");
-
return 0;
+ error2:
+ pm_runtime_disable(&pdev->dev);
error1:
clk_put(clk);
error0:
@@ -300,24 +293,30 @@ static int __devinit hspi_probe(struct platform_device *pdev)
return ret;
}
-static int __devexit hspi_remove(struct platform_device *pdev)
+static int hspi_remove(struct platform_device *pdev)
{
- struct hspi_priv *hspi = dev_get_drvdata(&pdev->dev);
+ struct hspi_priv *hspi = platform_get_drvdata(pdev);
pm_runtime_disable(&pdev->dev);
clk_put(hspi->clk);
- spi_unregister_master(hspi->master);
return 0;
}
+static struct of_device_id hspi_of_match[] = {
+ { .compatible = "renesas,hspi", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, hspi_of_match);
+
static struct platform_driver hspi_driver = {
.probe = hspi_probe,
- .remove = __devexit_p(hspi_remove),
+ .remove = hspi_remove,
.driver = {
.name = "sh-hspi",
.owner = THIS_MODULE,
+ .of_match_table = hspi_of_match,
},
};
module_platform_driver(hspi_driver);
@@ -325,4 +324,4 @@ module_platform_driver(hspi_driver);
MODULE_DESCRIPTION("SuperH HSPI bus driver");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
-MODULE_ALIAS("platform:sh_spi");
+MODULE_ALIAS("platform:sh-hspi");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 23:07:36 +0000