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path: root/drivers/spi/spi-ppc4xx.c
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Diffstat (limited to 'drivers/spi/spi-ppc4xx.c')
-rw-r--r--drivers/spi/spi-ppc4xx.c106
1 files changed, 11 insertions, 95 deletions
diff --git a/drivers/spi/spi-ppc4xx.c b/drivers/spi/spi-ppc4xx.c
index 0ea2d9a369d9..d8ee363fb714 100644
--- a/drivers/spi/spi-ppc4xx.c
+++ b/drivers/spi/spi-ppc4xx.c
@@ -28,11 +28,9 @@
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
-#include <linux/of_gpio.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
-#include <linux/gpio.h>
#include <linux/spi/spi.h>
#include <linux/spi/spi_bitbang.h>
@@ -127,8 +125,6 @@ struct ppc4xx_spi {
const unsigned char *tx;
unsigned char *rx;
- int *gpios;
-
struct spi_ppc4xx_regs __iomem *regs; /* pointer to the registers */
struct spi_master *master;
struct device *dev;
@@ -260,27 +256,6 @@ static int spi_ppc4xx_setup(struct spi_device *spi)
return 0;
}
-static void spi_ppc4xx_chipsel(struct spi_device *spi, int value)
-{
- struct ppc4xx_spi *hw = spi_master_get_devdata(spi->master);
- unsigned int cs = spi->chip_select;
- unsigned int cspol;
-
- /*
- * If there are no chip selects at all, or if this is the special
- * case of a non-existent (dummy) chip select, do nothing.
- */
-
- if (!hw->master->num_chipselect || hw->gpios[cs] == -EEXIST)
- return;
-
- cspol = spi->mode & SPI_CS_HIGH ? 1 : 0;
- if (value == BITBANG_CS_INACTIVE)
- cspol = !cspol;
-
- gpio_set_value(hw->gpios[cs], cspol);
-}
-
static irqreturn_t spi_ppc4xx_int(int irq, void *dev_id)
{
struct ppc4xx_spi *hw;
@@ -359,19 +334,6 @@ static void spi_ppc4xx_enable(struct ppc4xx_spi *hw)
dcri_clrset(SDR0, SDR0_PFC1, 0x80000000 >> 14, 0);
}
-static void free_gpios(struct ppc4xx_spi *hw)
-{
- if (hw->master->num_chipselect) {
- int i;
- for (i = 0; i < hw->master->num_chipselect; i++)
- if (gpio_is_valid(hw->gpios[i]))
- gpio_free(hw->gpios[i]);
-
- kfree(hw->gpios);
- hw->gpios = NULL;
- }
-}
-
/*
* platform_device layer stuff...
*/
@@ -385,7 +347,6 @@ static int spi_ppc4xx_of_probe(struct platform_device *op)
struct device *dev = &op->dev;
struct device_node *opbnp;
int ret;
- int num_gpios;
const unsigned int *clk;
master = spi_alloc_master(dev, sizeof *hw);
@@ -399,74 +360,32 @@ static int spi_ppc4xx_of_probe(struct platform_device *op)
init_completion(&hw->done);
- /*
- * A count of zero implies a single SPI device without any chip-select.
- * Note that of_gpio_count counts all gpios assigned to this spi master.
- * This includes both "null" gpio's and real ones.
- */
- num_gpios = of_gpio_count(np);
- if (num_gpios > 0) {
- int i;
-
- hw->gpios = kcalloc(num_gpios, sizeof(*hw->gpios), GFP_KERNEL);
- if (!hw->gpios) {
- ret = -ENOMEM;
- goto free_master;
- }
-
- for (i = 0; i < num_gpios; i++) {
- int gpio;
- enum of_gpio_flags flags;
-
- gpio = of_get_gpio_flags(np, i, &flags);
- hw->gpios[i] = gpio;
-
- if (gpio_is_valid(gpio)) {
- /* Real CS - set the initial state. */
- ret = gpio_request(gpio, np->name);
- if (ret < 0) {
- dev_err(dev,
- "can't request gpio #%d: %d\n",
- i, ret);
- goto free_gpios;
- }
-
- gpio_direction_output(gpio,
- !!(flags & OF_GPIO_ACTIVE_LOW));
- } else if (gpio == -EEXIST) {
- ; /* No CS, but that's OK. */
- } else {
- dev_err(dev, "invalid gpio #%d: %d\n", i, gpio);
- ret = -EINVAL;
- goto free_gpios;
- }
- }
- }
-
/* Setup the state for the bitbang driver */
bbp = &hw->bitbang;
bbp->master = hw->master;
bbp->setup_transfer = spi_ppc4xx_setupxfer;
- bbp->chipselect = spi_ppc4xx_chipsel;
bbp->txrx_bufs = spi_ppc4xx_txrx;
bbp->use_dma = 0;
bbp->master->setup = spi_ppc4xx_setup;
bbp->master->cleanup = spi_ppc4xx_cleanup;
bbp->master->bits_per_word_mask = SPI_BPW_MASK(8);
+ bbp->master->use_gpio_descriptors = true;
+ /*
+ * The SPI core will count the number of GPIO descriptors to figure
+ * out the number of chip selects available on the platform.
+ */
+ bbp->master->num_chipselect = 0;
/* the spi->mode bits understood by this driver: */
bbp->master->mode_bits =
SPI_CPHA | SPI_CPOL | SPI_CS_HIGH | SPI_LSB_FIRST;
- /* this many pins in all GPIO controllers */
- bbp->master->num_chipselect = num_gpios > 0 ? num_gpios : 0;
-
/* Get the clock for the OPB */
opbnp = of_find_compatible_node(NULL, NULL, "ibm,opb");
if (opbnp == NULL) {
dev_err(dev, "OPB: cannot find node\n");
ret = -ENODEV;
- goto free_gpios;
+ goto free_master;
}
/* Get the clock (Hz) for the OPB */
clk = of_get_property(opbnp, "clock-frequency", NULL);
@@ -474,7 +393,7 @@ static int spi_ppc4xx_of_probe(struct platform_device *op)
dev_err(dev, "OPB: no clock-frequency property set\n");
of_node_put(opbnp);
ret = -ENODEV;
- goto free_gpios;
+ goto free_master;
}
hw->opb_freq = *clk;
hw->opb_freq >>= 2;
@@ -483,7 +402,7 @@ static int spi_ppc4xx_of_probe(struct platform_device *op)
ret = of_address_to_resource(np, 0, &resource);
if (ret) {
dev_err(dev, "error while parsing device node resource\n");
- goto free_gpios;
+ goto free_master;
}
hw->mapbase = resource.start;
hw->mapsize = resource_size(&resource);
@@ -492,7 +411,7 @@ static int spi_ppc4xx_of_probe(struct platform_device *op)
if (hw->mapsize < sizeof(struct spi_ppc4xx_regs)) {
dev_err(dev, "too small to map registers\n");
ret = -EINVAL;
- goto free_gpios;
+ goto free_master;
}
/* Request IRQ */
@@ -501,7 +420,7 @@ static int spi_ppc4xx_of_probe(struct platform_device *op)
0, "spi_ppc4xx_of", (void *)hw);
if (ret) {
dev_err(dev, "unable to allocate interrupt\n");
- goto free_gpios;
+ goto free_master;
}
if (!request_mem_region(hw->mapbase, hw->mapsize, DRIVER_NAME)) {
@@ -538,8 +457,6 @@ map_io_error:
release_mem_region(hw->mapbase, hw->mapsize);
request_mem_error:
free_irq(hw->irqnum, hw);
-free_gpios:
- free_gpios(hw);
free_master:
spi_master_put(master);
@@ -556,7 +473,6 @@ static int spi_ppc4xx_of_remove(struct platform_device *op)
release_mem_region(hw->mapbase, hw->mapsize);
free_irq(hw->irqnum, hw);
iounmap(hw->regs);
- free_gpios(hw);
spi_master_put(master);
return 0;
}
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-11-23 00:34:04 +0000