#include <linux/spi/spi.h>
#include <linux/err.h>
#include <linux/clk.h>
+#include <linux/io.h>
#include <asm/gpio.h>
#define SPI_FIFO_SIZE 4
+#define SPI_MAX_DIVIDER 0xff /* Max. value for SPCR1.SER */
+#define SPI_MIN_DIVIDER 1 /* Min. value for SPCR1.SER */
#define TXx9_SPMCR 0x00
#define TXx9_SPCR0 0x04
struct list_head queue;
wait_queue_head_t waitq;
void __iomem *membase;
- int irq;
int baseclk;
struct clk *clk;
u32 max_speed_hz, min_speed_hz;
ndelay(cs_delay); /* CS Setup Time / CS Recovery Time */
}
-/* the spi->mode bits understood by this driver: */
-#define MODEBITS (SPI_CS_HIGH|SPI_CPOL|SPI_CPHA)
-
static int txx9spi_setup(struct spi_device *spi)
{
struct txx9spi *c = spi_master_get_devdata(spi->master);
u8 bits_per_word;
- if (spi->mode & ~MODEBITS)
- return -EINVAL;
-
if (!spi->max_speed_hz
|| spi->max_speed_hz > c->max_speed_hz
|| spi->max_speed_hz < c->min_speed_hz)
return -EINVAL;
- bits_per_word = spi->bits_per_word ? : 8;
+ bits_per_word = spi->bits_per_word;
if (bits_per_word != 8 && bits_per_word != 16)
return -EINVAL;
if (prev_speed_hz != speed_hz
|| prev_bits_per_word != bits_per_word) {
- u32 n = (c->baseclk + speed_hz - 1) / speed_hz;
- if (n < 1)
- n = 1;
- else if (n > 0xff)
- n = 0xff;
+ int n = DIV_ROUND_UP(c->baseclk, speed_hz) - 1;
+ n = clamp(n, SPI_MIN_DIVIDER, SPI_MAX_DIVIDER);
/* enter config mode */
txx9spi_wr(c, mcr | TXx9_SPMCR_CONFIG | TXx9_SPMCR_BCLR,
TXx9_SPMCR);
struct resource *res;
int ret = -ENODEV;
u32 mcr;
+ int irq;
master = spi_alloc_master(&dev->dev, sizeof(*c));
if (!master)
return ret;
c = spi_master_get_devdata(master);
- c->irq = -1;
platform_set_drvdata(dev, master);
INIT_WORK(&c->work, txx9spi_work);
goto exit;
}
c->baseclk = clk_get_rate(c->clk);
- c->min_speed_hz = (c->baseclk + 0xff - 1) / 0xff;
- c->max_speed_hz = c->baseclk;
+ c->min_speed_hz = DIV_ROUND_UP(c->baseclk, SPI_MAX_DIVIDER + 1);
+ c->max_speed_hz = c->baseclk / (SPI_MIN_DIVIDER + 1);
res = platform_get_resource(dev, IORESOURCE_MEM, 0);
if (!res)
- goto exit;
- c->membase = ioremap(res->start, res->end - res->start + 1);
+ goto exit_busy;
+ if (!devm_request_mem_region(&dev->dev, res->start, resource_size(res),
+ "spi_txx9"))
+ goto exit_busy;
+ c->membase = devm_ioremap(&dev->dev, res->start, resource_size(res));
if (!c->membase)
- goto exit;
+ goto exit_busy;
/* enter config mode */
mcr = txx9spi_rd(c, TXx9_SPMCR);
mcr &= ~(TXx9_SPMCR_OPMODE | TXx9_SPMCR_SPSTP | TXx9_SPMCR_BCLR);
txx9spi_wr(c, mcr | TXx9_SPMCR_CONFIG | TXx9_SPMCR_BCLR, TXx9_SPMCR);
- c->irq = platform_get_irq(dev, 0);
- if (c->irq < 0)
- goto exit;
- ret = request_irq(c->irq, txx9spi_interrupt, 0, dev->name, c);
- if (ret) {
- c->irq = -1;
+ irq = platform_get_irq(dev, 0);
+ if (irq < 0)
+ goto exit_busy;
+ ret = devm_request_irq(&dev->dev, irq, txx9spi_interrupt, 0,
+ "spi_txx9", c);
+ if (ret)
goto exit;
- }
- c->workqueue = create_singlethread_workqueue(master->cdev.dev->bus_id);
+ c->workqueue = create_singlethread_workqueue(
+ dev_name(master->dev.parent));
if (!c->workqueue)
- goto exit;
+ goto exit_busy;
c->last_chipselect = -1;
dev_info(&dev->dev, "at %#llx, irq %d, %dMHz\n",
- (unsigned long long)res->start, c->irq,
+ (unsigned long long)res->start, irq,
(c->baseclk + 500000) / 1000000);
+ /* the spi->mode bits understood by this driver: */
+ master->mode_bits = SPI_CS_HIGH | SPI_CPOL | SPI_CPHA;
+
master->bus_num = dev->id;
master->setup = txx9spi_setup;
master->transfer = txx9spi_transfer;
if (ret)
goto exit;
return 0;
+exit_busy:
+ ret = -EBUSY;
exit:
if (c->workqueue)
destroy_workqueue(c->workqueue);
- if (c->irq >= 0)
- free_irq(c->irq, c);
- if (c->membase)
- iounmap(c->membase);
if (c->clk) {
clk_disable(c->clk);
clk_put(c->clk);
spi_unregister_master(master);
platform_set_drvdata(dev, NULL);
destroy_workqueue(c->workqueue);
- free_irq(c->irq, c);
- iounmap(c->membase);
clk_disable(c->clk);
clk_put(c->clk);
spi_master_put(master);
return 0;
}
+/* work with hotplug and coldplug */
+MODULE_ALIAS("platform:spi_txx9");
+
static struct platform_driver txx9spi_driver = {
.remove = __exit_p(txx9spi_remove),
.driver = {