From: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@xxxxxxxxxxxx>
The atmel_spi use only gpio for chip select.
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@xxxxxxxxxxxx>
[wenyou.yang@xxxxxxxxx: Add driver data and compatible "atmel,at91sam9260-spi", "atmel,at91sam9x5-spi"]
Signed-off-by: Wenyou Yang <wenyou.yang@xxxxxxxxx>
Cc: devicetree-discuss@xxxxxxxxxxxxxxxx
Cc: spi-devel-general@xxxxxxxxxxxxxxxxxxxxx
Cc: grant.likely@xxxxxxxxxxxx
Cc: rob.herring@xxxxxxxxxxx
Cc: rob@xxxxxxxxxxx
Cc: linux-doc@xxxxxxxxxxxxxxx
Cc: richard.genoud@xxxxxxxxx
---
Hi, Richard,
This patches is based on the original patch from Jean-Christophe
[PATCH] spi/atmel: add DT support
and merge the patch from Richard Genoud
[PATCH] spi-atmel OF: complete documentation
ane wenyou yang add more compatible "atmel,at91sam9260-spi", "atmel,at91sam9x5-spi",
add driver data to get IP version and dma support.
Could you sign your signature in this patch?
Best Regards,
Wenyou Yang
.../devicetree/bindings/spi/spi_atmel.txt | 23 +++++
drivers/spi/spi-atmel.c | 102 +++++++++++++++++---
2 files changed, 113 insertions(+), 12 deletions(-)
create mode 100644 Documentation/devicetree/bindings/spi/spi_atmel.txt
diff --git a/Documentation/devicetree/bindings/spi/spi_atmel.txt b/Documentation/devicetree/bindings/spi/spi_atmel.txt
new file mode 100644
index 0000000..20cdc91
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/spi_atmel.txt
@@ -0,0 +1,23 @@
+Atmel SPI device
+
+Required properties:
+- compatible : should be "atmel,at91rm9200-spi".
+- reg: Address and length of the register set for the device
+- interrupts: Should contain macb interrupt
+- cs-gpio: Should contain the GPIOs used for chipselect.
+- dma-mask: device coherent dma mask.
+
+spi0: spi@f0000000 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ compatible = "atmel,at91rm9200-spi";
+ reg = <0xf0000000 0x100>;
+ interrupts = <13 4>;
+ cs-gpios = <&pioA 14 0
+ &pioA 7 0 /* conflicts with TXD2 */
+ &pioA 1 0 /* conflicts with RXD0 */
+ &pioB 3 0 /* conflicts with ERXDV */
+ >;
+ dma-mask = <0xffffffff>;
+ status = "disabled";
+};
diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index 37f54c3..e032e3d 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -19,6 +19,7 @@
#include <linux/interrupt.h>
#include <linux/spi/spi.h>
#include <linux/slab.h>
+#include <linux/of.h>
#include <asm/io.h>
#include <mach/board.h>
@@ -185,6 +186,10 @@
* DMA transfers; transfer queue progress is driven by IRQs. The clock
* framework provides the base clock, subdivided for each spi_device.
*/
+struct atmel_spi_pdata {
+ u8 version;
+};
+
struct atmel_spi {
spinlock_t lock;
unsigned long flags;
@@ -203,6 +208,7 @@ struct atmel_spi {
struct spi_transfer *next_transfer;
unsigned long next_remaining_bytes;
int done_status;
+ struct atmel_spi_pdata *pdata;
void *buffer;
dma_addr_t buffer_dma;
@@ -217,6 +223,51 @@ struct atmel_spi_device {
#define BUFFER_SIZE PAGE_SIZE
#define INVALID_DMA_ADDRESS 0xffffffff
+static struct atmel_spi_pdata at91rm9200_config = {
+ .version = 1,
+};
+
+static struct atmel_spi_pdata at91sam9260_config = {
+ .version = 2,
+};
+
+static struct atmel_spi_pdata at91sam9x5_config = {
+ .version = 2,
+};
+
+static const struct platform_device_id atmel_spi_devtypes[] = {
+ {
+ .name = "spi-at91rm9200",
+ .driver_data = (unsigned long) &at91rm9200_config,
+ }, {
+ .name = "spi-at91sam9260",
+ .driver_data = (unsigned long) &at91sam9260_config,
+ }, {
+ .name = "spi-at91sam9x5",
+ .driver_data = (unsigned long) &at91sam9x5_config,
+ }, {
+ /* sentinel */
+ }
+};
+
+#if defined(CONFIG_OF)
+static const struct of_device_id atmel_spi_dt_ids[] = {
+ {
+ .compatible = "atmel,at91rm9200-spi",
+ .data = &at91rm9200_config,
+ } , {
+ .compatible = "atmel,at91sam9260-spi",
+ .data = &at91sam9260_config,
+ } , {
+ .compatible = "atmel,at91sam9x5-spi",
+ .data = &at91sam9x5_config,
+ }, {
+ /* sentinel */
+ }
+};
+MODULE_DEVICE_TABLE(of, atmel_spi_dt_ids);
+#endif
+
/*
* Version 2 of the SPI controller has
* - CR.LASTXFER
@@ -229,11 +280,15 @@ struct atmel_spi_device {
* register, but I haven't checked that it exists on all chips, and
* this is cheaper anyway.
*/
-static bool atmel_spi_is_v2(void)
+static bool atmel_spi_is_v2(struct atmel_spi *as)
{
- return !cpu_is_at91rm9200();
+ if (as->pdata->version == 2)
+ return true;
+ else
+ return false;
}
+
/*
* Earlier SPI controllers (e.g. on at91rm9200) have a design bug whereby
* they assume that spi slave device state will not change on deselect, so
@@ -265,7 +320,7 @@ static void cs_activate(struct atmel_spi *as, struct spi_device *spi)
unsigned active = spi->mode & SPI_CS_HIGH;
u32 mr;
- if (atmel_spi_is_v2()) {
+ if (atmel_spi_is_v2(as)) {
/*
* Always use CSR0. This ensures that the clock
* switches to the correct idle polarity before we
@@ -320,7 +375,7 @@ static void cs_deactivate(struct atmel_spi *as, struct spi_device *spi)
asd->npcs_pin, active ? " (low)" : "",
mr);
- if (atmel_spi_is_v2() || spi->chip_select != 0)
+ if (atmel_spi_is_v2(as) || spi->chip_select != 0)
gpio_set_value(asd->npcs_pin, !active);
}
@@ -710,7 +765,7 @@ static int atmel_spi_setup(struct spi_device *spi)
u32 scbr, csr;
unsigned int bits = spi->bits_per_word;
unsigned long bus_hz;
- unsigned int npcs_pin;
+ int npcs_pin;
int ret;
as = spi_master_get_devdata(spi->master);
@@ -733,7 +788,7 @@ static int atmel_spi_setup(struct spi_device *spi)
}
/* see notes above re chipselect */
- if (!atmel_spi_is_v2()
+ if (!atmel_spi_is_v2(as)
&& spi->chip_select == 0
&& (spi->mode & SPI_CS_HIGH)) {
dev_dbg(&spi->dev, "setup: can't be active-high\n");
@@ -742,7 +797,7 @@ static int atmel_spi_setup(struct spi_device *spi)
/* v1 chips start out at half the peripheral bus speed. */
bus_hz = clk_get_rate(as->clk);
- if (!atmel_spi_is_v2())
+ if (!atmel_spi_is_v2(as))
bus_hz /= 2;
if (spi->max_speed_hz) {
@@ -782,7 +837,9 @@ static int atmel_spi_setup(struct spi_device *spi)
csr |= SPI_BF(DLYBCT, 0);
/* chipselect must have been muxed as GPIO (e.g. in board setup) */
- npcs_pin = (unsigned int)spi->controller_data;
+ if (!gpio_is_valid(spi->cs_gpio))
+ spi->cs_gpio = (int)spi->controller_data;
+ npcs_pin = spi->cs_gpio;
asd = spi->controller_state;
if (!asd) {
asd = kzalloc(sizeof(struct atmel_spi_device), GFP_KERNEL);
@@ -812,7 +869,7 @@ static int atmel_spi_setup(struct spi_device *spi)
"setup: %lu Hz bpw %u mode 0x%x -> csr%d %08x\n",
bus_hz / scbr, bits, spi->mode, spi->chip_select, csr);
- if (!atmel_spi_is_v2())
+ if (!atmel_spi_is_v2(as))
spi_writel(as, CSR0 + 4 * spi->chip_select, csr);
return 0;
@@ -899,7 +956,7 @@ static void atmel_spi_cleanup(struct spi_device *spi)
{
struct atmel_spi *as = spi_master_get_devdata(spi->master);
struct atmel_spi_device *asd = spi->controller_state;
- unsigned gpio = (unsigned) spi->controller_data;
+ unsigned gpio = spi->cs_gpio;
if (!asd)
return;
@@ -916,6 +973,21 @@ static void atmel_spi_cleanup(struct spi_device *spi)
kfree(asd);
}
+static struct atmel_spi_pdata * __devinit atmel_spi_get_driver_data(
+ struct platform_device *pdev)
+{
+ if (pdev->dev.of_node) {
+ const struct of_device_id *match;
+ match = of_match_node(atmel_spi_dt_ids, pdev->dev.of_node);
+ if (!match)
+ return NULL;
+ return (struct atmel_spi_pdata *) match->data;
+ }
+
+ return (struct atmel_spi_pdata *)
+ platform_get_device_id(pdev)->driver_data;
+}
+
/*-------------------------------------------------------------------------*/
static int __devinit atmel_spi_probe(struct platform_device *pdev)
@@ -949,7 +1021,8 @@ static int __devinit atmel_spi_probe(struct platform_device *pdev)
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
master->bus_num = pdev->id;
- master->num_chipselect = 4;
+ master->dev.of_node = pdev->dev.of_node;
+ master->num_chipselect = master->dev.of_node ? 0 : 4;
master->setup = atmel_spi_setup;
master->transfer = atmel_spi_transfer;
master->cleanup = atmel_spi_cleanup;
@@ -981,6 +1054,10 @@ static int __devinit atmel_spi_probe(struct platform_device *pdev)
if (ret)
goto out_unmap_regs;
+ as->pdata = atmel_spi_get_driver_data(pdev);
+ if (!as->pdata)
+ goto out_unmap_regs;
+
/* Initialize the hardware */
clk_enable(clk);
spi_writel(as, CR, SPI_BIT(SWRST));
@@ -1078,12 +1155,13 @@ static int atmel_spi_resume(struct platform_device *pdev)
#define atmel_spi_resume NULL
#endif
-
static struct platform_driver atmel_spi_driver = {
.driver = {
.name = "atmel_spi",
.owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(atmel_spi_dt_ids),
},
+ .id_table = atmel_spi_devtypes,
.suspend = atmel_spi_suspend,
.resume = atmel_spi_resume,
.probe = atmel_spi_probe,
--
1.7.9.5
--
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