[v6,2/2] spi: loongson: add bus driver for the loongson spi controller
Commit Message
This bus driver supports the Loongson spi hardware controller in the
Loongson platforms and supports to use DTS and PCI framework to
register spi device resources.
Signed-off-by: Yinbo Zhu <zhuyinbo@loongson.cn>
---
MAINTAINERS | 4 +
drivers/spi/Kconfig | 31 ++++
drivers/spi/Makefile | 3 +
drivers/spi/spi-loongson-core.c | 304 ++++++++++++++++++++++++++++++++
drivers/spi/spi-loongson-pci.c | 89 ++++++++++
drivers/spi/spi-loongson-plat.c | 66 +++++++
drivers/spi/spi-loongson.h | 41 +++++
7 files changed, 538 insertions(+)
create mode 100644 drivers/spi/spi-loongson-core.c
create mode 100644 drivers/spi/spi-loongson-pci.c
create mode 100644 drivers/spi/spi-loongson-plat.c
create mode 100644 drivers/spi/spi-loongson.h
Comments
On 01/04/2023 11:56, Yinbo Zhu wrote:
> This bus driver supports the Loongson spi hardware controller in the
> Loongson platforms and supports to use DTS and PCI framework to
> register spi device resources.
>
> Signed-off-by: Yinbo Zhu <zhuyinbo@loongson.cn>
> ---
...
> +
> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/interrupt.h>
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/spi/spi.h>
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +
> +#include "spi-loongson.h"
> +
> +static inline void loongson_spi_write_reg(struct loongson_spi *spi, unsigned char reg,
> + unsigned char data)
> +{
> + writeb(data, spi->base + reg);
This wrapper does not simplify anything.
> +}
> +
> +static inline char loongson_spi_read_reg(struct loongson_spi *spi, unsigned char reg)
> +{
> + return readb(spi->base + reg);
Neither this one.
> +}
> +
> +static void loongson_spi_set_cs(struct spi_device *spi, bool val)
> +{
> + int cs;
> + struct loongson_spi *loongson_spi = spi_master_get_devdata(spi->master);
> +
(...)
> +
> +static int __init loongson_spi_pci_init(void)
> +{
> + int ret;
> +
> + ret = pci_register_driver(&loongson_spi_pci_driver);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}
> +
> +static void __exit loongson_spi_pci_exit(void)
> +{
> + pci_unregister_driver(&loongson_spi_pci_driver);
> +}
> +
> +module_init(loongson_spi_pci_init);
> +module_exit(loongson_spi_pci_exit);
module_xxx_driver?
> +
> +MODULE_DESCRIPTION("Loongson spi pci driver");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/spi/spi-loongson-plat.c b/drivers/spi/spi-loongson-plat.c
> new file mode 100644
> index 000000000000..8f4aa70168f3
> --- /dev/null
> +++ b/drivers/spi/spi-loongson-plat.c
> @@ -0,0 +1,66 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +// Platform driver for Loongson SPI Support
> +// Copyright (C) 2023 Loongson Technology Corporation Limited
> +
> +#include <linux/platform_device.h>
> +#include <linux/of.h>
> +
> +#include "spi-loongson.h"
> +
> +static int loongson_spi_platform_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + struct resource *res;
> + int ret;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (res == NULL) {
> + dev_err(dev, "cannot get io resource memory\n");
> + return -ENOENT;
> + }
> +
> + ret = loongson_spi_init_master(dev, res);
> + if (ret)
> + dev_err(dev, "failed to initialize master\n");
> +
> + return ret;
> +}
> +
> +static const struct of_device_id loongson_spi_id_table[] = {
> + { .compatible = "loongson,ls2k-spi", },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, loongson_spi_id_table);
> +
> +static struct platform_driver loongson_spi_plat_driver = {
> + .probe = loongson_spi_platform_probe,
> + .driver = {
> + .name = "loongson-spi",
> + .owner = THIS_MODULE,
Really? We get rid of it years ago. I bet you did not run coccicheck,
smatch, sparse...
> + .bus = &platform_bus_type,
> + .pm = &loongson_spi_dev_pm_ops,
> + .of_match_table = loongson_spi_id_table,
> + },
> +};
> +
> +static int __init loongson_spi_plat_init(void)
> +{
> + int ret;
> +
> + ret = platform_driver_register(&loongson_spi_plat_driver);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}
> +
> +static void __exit loongson_spi_plat_exit(void)
> +{
> + platform_driver_unregister(&loongson_spi_plat_driver);
> +}
> +
> +module_init(loongson_spi_plat_init);
> +module_exit(loongson_spi_plat_exit);
module_platform_driver.
> +
> +MODULE_DESCRIPTION("Loongson spi platform driver");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/spi/spi-loongson.h b/drivers/spi/spi-loongson.h
> new file mode 100644
> index 000000000000..44818340188d
> --- /dev/null
> +++ b/drivers/spi/spi-loongson.h
> @@ -0,0 +1,41 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/* Header File for Loongson SPI Driver. */
> +/* Copyright (C) 2023 Loongson Technology Corporation Limited */
> +
> +#ifndef __LINUX_SPI_LOONGSON_H
> +#define __LINUX_SPI_LOONGSON_H
> +
> +#define LOONGSON_SPI_SPCR_REG 0x00
There is just one space after #define.
Best regards,
Krzysztof
Le 01/04/2023 à 11:56, Yinbo Zhu a écrit :
> This bus driver supports the Loongson spi hardware controller in the
> Loongson platforms and supports to use DTS and PCI framework to
> register spi device resources.
>
> Signed-off-by: Yinbo Zhu <zhuyinbo-cXZgJK919ebM1kAEIRd3EQ@public.gmane.org>
> ---
[...]
> +int loongson_spi_init_master(struct device *dev, struct resource *res)
> +{
> + struct spi_master *master;
> + struct loongson_spi *spi;
> + struct clk *clk;
> + int ret;
> +
> + master = spi_alloc_master(dev, sizeof(struct loongson_spi));
devm_spi_alloc_master()?
(to simplify code and be consistent with devm_ function below)
> + if (master == NULL) {
> + dev_dbg(dev, "master allocation failed\n");
> + return -ENOMEM;
> + }
> +
> + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
> + master->setup = loongson_spi_setup;
> + master->prepare_message = loongson_spi_prepare_message;
> + master->transfer_one = loongson_spi_transfer_one;
> + master->unprepare_message = loongson_spi_unprepare_message;
> + master->set_cs = loongson_spi_set_cs;
> + master->num_chipselect = 4;
> + master->dev.of_node = of_node_get(dev->of_node);
> + dev_set_drvdata(dev, master);
> +
> + spi = spi_master_get_devdata(master);
> +
> + spi->master = master;
> +
> + spi->base = devm_ioremap(dev, res->start, resource_size(res));
> + if (spi->base == NULL) {
> + dev_err(dev, "cannot map io\n");
> + ret = -ENXIO;
> + goto free_master;
> + }
> +
> + clk = devm_clk_get(dev, NULL);
> + if (!IS_ERR(clk))
> + spi->clk_rate = clk_get_rate(clk);
> +
> + loongson_spi_reginit(spi);
> +
> + spi->mode = 0;
> + if (of_get_property(dev->of_node, "spi-nocs", NULL))
> + spi->mode |= SPI_NO_CS;
> +
> + ret = spi_register_master(master);
> + if (ret < 0)
> + goto free_master;
> +
> + return ret;
> +
> +free_master:
> + kfree(master);
> + spi_master_put(master);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(loongson_spi_init_master);
[...]
> diff --git a/drivers/spi/spi-loongson-pci.c b/drivers/spi/spi-loongson-pci.c
> new file mode 100644
> index 000000000000..b811de769ecb
> --- /dev/null
> +++ b/drivers/spi/spi-loongson-pci.c
> @@ -0,0 +1,89 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +// PCI interface driver for Loongson SPI Support
> +// Copyright (C) 2023 Loongson Technology Corporation Limited
> +
> +#include <linux/pci.h>
> +
> +#include "spi-loongson.h"
> +
> +static int loongson_spi_pci_register(struct pci_dev *pdev,
> + const struct pci_device_id *ent)
> +{
> + int ret;
> + unsigned char v8;
> + struct resource res[2];
> + struct device *dev = &pdev->dev;
> +
> + ret = pci_enable_device(pdev);
> + if (ret < 0) {
> + dev_err(dev, "cannot enable pci device\n");
> + goto err_out;
> + }
> +
> + ret = pci_request_region(pdev, 0, "loongson-spi io");
> + if (ret < 0) {
> + dev_err(dev, "cannot request region 0.\n");
> + goto err_out;
> + }
> +
> + res[0].start = pci_resource_start(pdev, 0);
> + res[0].end = pci_resource_end(pdev, 0);
> + ret = pci_read_config_byte(pdev, PCI_INTERRUPT_LINE, &v8);
> +
> + if (ret == PCIBIOS_SUCCESSFUL) {
> + res[1].start = v8;
> + res[1].end = v8;
> + }
> +
> + ret = loongson_spi_init_master(dev, res);
> + if (ret)
> + dev_err(dev, "failed to initialize master\n");
> +
> +err_out:
> + return ret;
> +}
> +
> +static void loongson_spi_pci_unregister(struct pci_dev *pdev)
> +{
> + pci_release_region(pdev, 0);
pci_disable_device()?
> +}
CJ
On Sun, Apr 02, 2023 at 12:04:00PM +0200, Krzysztof Kozlowski wrote:
> On 01/04/2023 11:56, Yinbo Zhu wrote:
> > +static inline void loongson_spi_write_reg(struct loongson_spi *spi, unsigned char reg,
> > + unsigned char data)
> > +{
> > + writeb(data, spi->base + reg);
> This wrapper does not simplify anything.
This is an *extremely* standard wrapper which adds the base and
register to work out the address to write to without having to
duplicate it for every caller. There is absolutely nothing wrong
with it, or the read equivalent - they are useful and helpful.
> > +#define LOONGSON_SPI_SPCR_REG 0x00
> There is just one space after #define.
It's using a tab which is again not the end of the world.
在 2023/4/2 下午7:44, Christophe JAILLET 写道:
> Le 01/04/2023 à 11:56, Yinbo Zhu a écrit :
>> This bus driver supports the Loongson spi hardware controller in the
>> Loongson platforms and supports to use DTS and PCI framework to
>> register spi device resources.
>>
>> Signed-off-by: Yinbo Zhu
>> <zhuyinbo-cXZgJK919ebM1kAEIRd3EQ@public.gmane.org>
>> ---
>
> [...]
>
>> +int loongson_spi_init_master(struct device *dev, struct resource *res)
>> +{
>> + struct spi_master *master;
>> + struct loongson_spi *spi;
>> + struct clk *clk;
>> + int ret;
>> +
>> + master = spi_alloc_master(dev, sizeof(struct loongson_spi));
>
> devm_spi_alloc_master()?
> (to simplify code and be consistent with devm_ function below)
okay, I got it, I will use it.
>
>> + if (master == NULL) {
>> + dev_dbg(dev, "master allocation failed\n");
>> + return -ENOMEM;
>> + }
>> +
>> + master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
>> + master->setup = loongson_spi_setup;
>> + master->prepare_message = loongson_spi_prepare_message;
>> + master->transfer_one = loongson_spi_transfer_one;
>> + master->unprepare_message = loongson_spi_unprepare_message;
>> + master->set_cs = loongson_spi_set_cs;
>> + master->num_chipselect = 4;
>> + master->dev.of_node = of_node_get(dev->of_node);
>> + dev_set_drvdata(dev, master);
>> +
>> + spi = spi_master_get_devdata(master);
>> +
>> + spi->master = master;
>> +
>> + spi->base = devm_ioremap(dev, res->start, resource_size(res));
>> + if (spi->base == NULL) {
>> + dev_err(dev, "cannot map io\n");
>> + ret = -ENXIO;
>> + goto free_master;
>> + }
>> +
>> + clk = devm_clk_get(dev, NULL);
>> + if (!IS_ERR(clk))
>> + spi->clk_rate = clk_get_rate(clk);
>> +
>> + loongson_spi_reginit(spi);
>> +
>> + spi->mode = 0;
>> + if (of_get_property(dev->of_node, "spi-nocs", NULL))
>> + spi->mode |= SPI_NO_CS;
>> +
>> + ret = spi_register_master(master);
>> + if (ret < 0)
>> + goto free_master;
>> +
>> + return ret;
>> +
>> +free_master:
>> + kfree(master);
>> + spi_master_put(master);
>> +
>> + return ret;
>> +}
>> +EXPORT_SYMBOL_GPL(loongson_spi_init_master);
>
> [...]
>
>> diff --git a/drivers/spi/spi-loongson-pci.c
>> b/drivers/spi/spi-loongson-pci.c
>> new file mode 100644
>> index 000000000000..b811de769ecb
>> --- /dev/null
>> +++ b/drivers/spi/spi-loongson-pci.c
>> @@ -0,0 +1,89 @@
>> +// SPDX-License-Identifier: GPL-2.0+
>> +// PCI interface driver for Loongson SPI Support
>> +// Copyright (C) 2023 Loongson Technology Corporation Limited
>> +
>> +#include <linux/pci.h>
>> +
>> +#include "spi-loongson.h"
>> +
>> +static int loongson_spi_pci_register(struct pci_dev *pdev,
>> + const struct pci_device_id *ent)
>> +{
>> + int ret;
>> + unsigned char v8;
>> + struct resource res[2];
>> + struct device *dev = &pdev->dev;
>> +
>> + ret = pci_enable_device(pdev);
>> + if (ret < 0) {
>> + dev_err(dev, "cannot enable pci device\n");
>> + goto err_out;
>> + }
>> +
>> + ret = pci_request_region(pdev, 0, "loongson-spi io");
>> + if (ret < 0) {
>> + dev_err(dev, "cannot request region 0.\n");
>> + goto err_out;
>> + }
>> +
>> + res[0].start = pci_resource_start(pdev, 0);
>> + res[0].end = pci_resource_end(pdev, 0);
>> + ret = pci_read_config_byte(pdev, PCI_INTERRUPT_LINE, &v8);
>> +
>> + if (ret == PCIBIOS_SUCCESSFUL) {
>> + res[1].start = v8;
>> + res[1].end = v8;
>> + }
>> +
>> + ret = loongson_spi_init_master(dev, res);
>> + if (ret)
>> + dev_err(dev, "failed to initialize master\n");
>> +
>> +err_out:
>> + return ret;
>> +}
>> +
>> +static void loongson_spi_pci_unregister(struct pci_dev *pdev)
>> +{
>> + pci_release_region(pdev, 0);
>
> pci_disable_device()?
okay, I will add pci_disable_device() here.
Thanks.
>
>> +}
>
> CJ
在 2023/4/2 下午6:04, Krzysztof Kozlowski 写道:
> On 01/04/2023 11:56, Yinbo Zhu wrote:
>> This bus driver supports the Loongson spi hardware controller in the
>> Loongson platforms and supports to use DTS and PCI framework to
>> register spi device resources.
>>
>> Signed-off-by: Yinbo Zhu <zhuyinbo@loongson.cn>
>> ---
>
>
> ...
>
>> +
>> +#include <linux/init.h>
>> +#include <linux/module.h>
>> +#include <linux/kernel.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/delay.h>
>> +#include <linux/err.h>
>> +#include <linux/spi/spi.h>
>> +#include <linux/clk.h>
>> +#include <linux/io.h>
>> +
>> +#include "spi-loongson.h"
>> +
>> +static inline void loongson_spi_write_reg(struct loongson_spi *spi, unsigned char reg,
>> + unsigned char data)
>> +{
>> + writeb(data, spi->base + reg);
>
> This wrapper does not simplify anything.
Mark seems to have other viewpoint.
>
>> +}
>> +
>> +static inline char loongson_spi_read_reg(struct loongson_spi *spi, unsigned char reg)
>> +{
>> + return readb(spi->base + reg);
>
> Neither this one.
>
>> +}
>> +
>> +static void loongson_spi_set_cs(struct spi_device *spi, bool val)
>> +{
>> + int cs;
>> + struct loongson_spi *loongson_spi = spi_master_get_devdata(spi->master);
>> +
>
> (...)
>
>> +
>> +static int __init loongson_spi_pci_init(void)
>> +{
>> + int ret;
>> +
>> + ret = pci_register_driver(&loongson_spi_pci_driver);
>> + if (ret)
>> + return ret;
>> +
>> + return 0;
>> +}
>> +
>> +static void __exit loongson_spi_pci_exit(void)
>> +{
>> + pci_unregister_driver(&loongson_spi_pci_driver);
>> +}
>> +
>> +module_init(loongson_spi_pci_init);
>> +module_exit(loongson_spi_pci_exit);
>
> module_xxx_driver?
okay, I got it.
>
>> +
>> +MODULE_DESCRIPTION("Loongson spi pci driver");
>> +MODULE_LICENSE("GPL");
>> diff --git a/drivers/spi/spi-loongson-plat.c b/drivers/spi/spi-loongson-plat.c
>> new file mode 100644
>> index 000000000000..8f4aa70168f3
>> --- /dev/null
>> +++ b/drivers/spi/spi-loongson-plat.c
>> @@ -0,0 +1,66 @@
>> +// SPDX-License-Identifier: GPL-2.0+
>> +// Platform driver for Loongson SPI Support
>> +// Copyright (C) 2023 Loongson Technology Corporation Limited
>> +
>> +#include <linux/platform_device.h>
>> +#include <linux/of.h>
>> +
>> +#include "spi-loongson.h"
>> +
>> +static int loongson_spi_platform_probe(struct platform_device *pdev)
>> +{
>> + struct device *dev = &pdev->dev;
>> + struct resource *res;
>> + int ret;
>> +
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> + if (res == NULL) {
>> + dev_err(dev, "cannot get io resource memory\n");
>> + return -ENOENT;
>> + }
>> +
>> + ret = loongson_spi_init_master(dev, res);
>> + if (ret)
>> + dev_err(dev, "failed to initialize master\n");
>> +
>> + return ret;
>> +}
>> +
>> +static const struct of_device_id loongson_spi_id_table[] = {
>> + { .compatible = "loongson,ls2k-spi", },
>> + { }
>> +};
>> +MODULE_DEVICE_TABLE(of, loongson_spi_id_table);
>> +
>> +static struct platform_driver loongson_spi_plat_driver = {
>> + .probe = loongson_spi_platform_probe,
>> + .driver = {
>> + .name = "loongson-spi",
>> + .owner = THIS_MODULE,
>
> Really? We get rid of it years ago. I bet you did not run coccicheck,
> smatch, sparse...
okay, I got it, I will remove this line.
Thanks.
>
>> + .bus = &platform_bus_type,
>> + .pm = &loongson_spi_dev_pm_ops,
>> + .of_match_table = loongson_spi_id_table,
>> + },
>> +};
>> +
>> +static int __init loongson_spi_plat_init(void)
>> +{
>> + int ret;
>> +
>> + ret = platform_driver_register(&loongson_spi_plat_driver);
>> + if (ret)
>> + return ret;
>> +
>> + return 0;
>> +}
>> +
>> +static void __exit loongson_spi_plat_exit(void)
>> +{
>> + platform_driver_unregister(&loongson_spi_plat_driver);
>> +}
>> +
>> +module_init(loongson_spi_plat_init);
>> +module_exit(loongson_spi_plat_exit);
>
> module_platform_driver.
okay, I will use it.
>
>> +
>> +MODULE_DESCRIPTION("Loongson spi platform driver");
>> +MODULE_LICENSE("GPL");
>> diff --git a/drivers/spi/spi-loongson.h b/drivers/spi/spi-loongson.h
>> new file mode 100644
>> index 000000000000..44818340188d
>> --- /dev/null
>> +++ b/drivers/spi/spi-loongson.h
>> @@ -0,0 +1,41 @@
>> +/* SPDX-License-Identifier: GPL-2.0+ */
>> +/* Header File for Loongson SPI Driver. */
>> +/* Copyright (C) 2023 Loongson Technology Corporation Limited */
>> +
>> +#ifndef __LINUX_SPI_LOONGSON_H
>> +#define __LINUX_SPI_LOONGSON_H
>> +
>> +#define LOONGSON_SPI_SPCR_REG 0x00
>
> There is just one space after #define.
Mark seems to have other viewpoint.
>
>
> Best regards,
> Krzysztof
>
@@ -12162,6 +12162,10 @@ M: Yinbo Zhu <zhuyinbo@loongson.cn>
L: linux-spi@vger.kernel.org
S: Maintained
F: Documentation/devicetree/bindings/spi/loongson,ls-spi.yaml
+F: drivers/spi/spi-loongson-core.c
+F: drivers/spi/spi-loongson-pci.c
+F: drivers/spi/spi-loongson-plat.c
+F: drivers/spi/spi-loongson.h
LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI)
M: Sathya Prakash <sathya.prakash@broadcom.com>
@@ -509,6 +509,37 @@ config SPI_LM70_LLP
which interfaces to an LM70 temperature sensor using
a parallel port.
+config SPI_LOONGSON_CORE
+ tristate "Loongson SPI Controller Core Driver Support"
+ depends on LOONGARCH || COMPILE_TEST
+ help
+ This core driver supports the Loongson spi hardware controller in
+ the Loongson platforms.
+ Say Y or M here if you want to use the SPI controller on
+ Loongson platform.
+
+config SPI_LOONGSON_PCI
+ tristate "Loongson SPI Controller PCI Driver Support"
+ select SPI_LOONGSON_CORE
+ depends on PCI && (LOONGARCH || COMPILE_TEST)
+ help
+ This bus driver supports the Loongson spi hardware controller in
+ the Loongson platforms and supports to use PCI framework to
+ register spi device resources.
+ Say Y or M here if you want to use the SPI controller on
+ Loongson platform.
+
+config SPI_LOONGSON_PLATFORM
+ tristate "Loongson SPI Controller Platform Driver Support"
+ select SPI_LOONGSON_CORE
+ depends on OF && (LOONGARCH || COMPILE_TEST)
+ help
+ This bus driver supports the Loongson spi hardware controller in
+ the Loongson platforms and supports to use DTS framework to
+ register spi device resources.
+ Say Y or M here if you want to use the SPI controller on
+ Loongson platform.
+
config SPI_LP8841_RTC
tristate "ICP DAS LP-8841 SPI Controller for RTC"
depends on MACH_PXA27X_DT || COMPILE_TEST
@@ -70,6 +70,9 @@ obj-$(CONFIG_SPI_INTEL_PLATFORM) += spi-intel-platform.o
obj-$(CONFIG_SPI_LANTIQ_SSC) += spi-lantiq-ssc.o
obj-$(CONFIG_SPI_JCORE) += spi-jcore.o
obj-$(CONFIG_SPI_LM70_LLP) += spi-lm70llp.o
+obj-$(CONFIG_SPI_LOONGSON_CORE) += spi-loongson-core.o
+obj-$(CONFIG_SPI_LOONGSON_PCI) += spi-loongson-pci.o
+obj-$(CONFIG_SPI_LOONGSON_PLATFORM) += spi-loongson-plat.o
obj-$(CONFIG_SPI_LP8841_RTC) += spi-lp8841-rtc.o
obj-$(CONFIG_SPI_MESON_SPICC) += spi-meson-spicc.o
obj-$(CONFIG_SPI_MESON_SPIFC) += spi-meson-spifc.o
new file mode 100644
@@ -0,0 +1,304 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Loongson SPI Support
+// Copyright (C) 2023 Loongson Technology Corporation Limited
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/spi/spi.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#include "spi-loongson.h"
+
+static inline void loongson_spi_write_reg(struct loongson_spi *spi, unsigned char reg,
+ unsigned char data)
+{
+ writeb(data, spi->base + reg);
+}
+
+static inline char loongson_spi_read_reg(struct loongson_spi *spi, unsigned char reg)
+{
+ return readb(spi->base + reg);
+}
+
+static void loongson_spi_set_cs(struct spi_device *spi, bool val)
+{
+ int cs;
+ struct loongson_spi *loongson_spi = spi_master_get_devdata(spi->master);
+
+ if (loongson_spi->mode & SPI_NO_CS)
+ loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_SFCS_REG, 0);
+ else {
+ cs = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_SFCS_REG)
+ & ~(0x11 << spi->chip_select);
+ loongson_spi_write_reg(loongson_spi,
+ LOONGSON_SPI_SFCS_REG,
+ (val ? (0x11 << spi->chip_select) :
+ (0x1 << spi->chip_select)) | cs);
+ }
+}
+
+static int loongson_spi_update_state(struct loongson_spi *loongson_spi,
+ struct spi_device *spi, struct spi_transfer *t)
+{
+ unsigned int hz;
+ unsigned int div, div_tmp;
+ unsigned int bit;
+ unsigned char val;
+ const char rdiv[12] = {0, 1, 4, 2, 3, 5, 6, 7, 8, 9, 10, 11};
+
+ if (t)
+ hz = t->speed_hz;
+
+ if ((hz && loongson_spi->hz != hz) ||
+ ((spi->mode ^ loongson_spi->mode) & (SPI_CPOL | SPI_CPHA))) {
+ div = DIV_ROUND_UP_ULL(loongson_spi->clk_rate, hz);
+ if (div < 2)
+ div = 2;
+ if (div > 4096)
+ div = 4096;
+
+ bit = fls(div) - 1;
+ if ((1<<bit) == div)
+ bit--;
+ div_tmp = rdiv[bit];
+ dev_dbg(&spi->dev, "clk_rate = %llu hz = %d div_tmp = %d bit = %d\n",
+ loongson_spi->clk_rate, hz, div_tmp, bit);
+
+ loongson_spi->hz = hz;
+ loongson_spi->spcr = div_tmp & 3;
+ loongson_spi->sper = (div_tmp >> 2) & 3;
+ val = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_SPCR_REG);
+ val &= ~0xc;
+ if (spi->mode & SPI_CPOL)
+ val |= 8;
+ if (spi->mode & SPI_CPHA)
+ val |= 4;
+
+ loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_SPCR_REG, (val & ~3) |
+ loongson_spi->spcr);
+ val = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_SPER_REG);
+ loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_SPER_REG, (val & ~3) |
+ loongson_spi->sper);
+ loongson_spi->mode &= SPI_NO_CS;
+ loongson_spi->mode |= spi->mode;
+ }
+
+ return 0;
+}
+
+static int loongson_spi_setup(struct spi_device *spi)
+{
+ struct loongson_spi *loongson_spi;
+
+ loongson_spi = spi_master_get_devdata(spi->master);
+ if (spi->bits_per_word % 8)
+ return -EINVAL;
+
+ if (spi->chip_select >= spi->master->num_chipselect)
+ return -EINVAL;
+
+ loongson_spi->hz = 0;
+ loongson_spi->mode &= SPI_NO_CS;
+ loongson_spi_set_cs(spi, 1);
+
+ return 0;
+}
+
+static int loongson_spi_write_read_8bit(struct spi_device *spi, const u8 **tx_buf,
+ u8 **rx_buf, unsigned int num)
+{
+ struct loongson_spi *loongson_spi = spi_master_get_devdata(spi->master);
+ unsigned long timeout = jiffies + SPI_COMPLETION_TIMEOUT;
+
+ if (tx_buf && *tx_buf) {
+ loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_FIFO_REG, *((*tx_buf)++));
+ while ((loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_SPSR_REG) & 0x1) == 1 &&
+ time_after(timeout, jiffies))
+ cpu_relax();
+ } else {
+ loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_FIFO_REG, 0);
+ while ((loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_SPSR_REG) & 0x1) == 1 &&
+ time_after(timeout, jiffies))
+ cpu_relax();
+ }
+
+ if (rx_buf && *rx_buf)
+ *(*rx_buf)++ = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_FIFO_REG);
+ else
+ loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_FIFO_REG);
+
+ return 0;
+}
+
+static unsigned int loongson_spi_write_read(struct spi_device *spi, struct spi_transfer *xfer)
+{
+ unsigned int count;
+ const u8 *tx = xfer->tx_buf;
+ u8 *rx = xfer->rx_buf;
+
+ count = xfer->len;
+
+ do {
+ if (loongson_spi_write_read_8bit(spi, &tx, &rx, count) < 0)
+ goto out;
+ count--;
+ } while (count);
+
+out:
+ return xfer->len - count;
+}
+
+static int loongson_spi_prepare_message(struct spi_controller *ctlr, struct spi_message *m)
+{
+ struct loongson_spi *loongson_spi = spi_controller_get_devdata(ctlr);
+
+ loongson_spi->para = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_PARA_REG);
+ loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_PARA_REG, loongson_spi->para & ~1);
+
+ return 0;
+}
+
+static int loongson_spi_transfer_one(struct spi_controller *ctrl, struct spi_device *spi,
+ struct spi_transfer *xfer)
+{
+ struct loongson_spi *loongson_spi = spi_master_get_devdata(spi->master);
+
+ loongson_spi_update_state(loongson_spi, spi, xfer);
+ if (xfer->len)
+ xfer->len = loongson_spi_write_read(spi, xfer);
+
+ return 0;
+}
+
+static int loongson_spi_unprepare_message(struct spi_controller *ctrl, struct spi_message *m)
+{
+ struct loongson_spi *loongson_spi = spi_controller_get_devdata(ctrl);
+
+ loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_PARA_REG, loongson_spi->para);
+
+ return 0;
+}
+
+static void loongson_spi_reginit(struct loongson_spi *loongson_spi_dev)
+{
+ unsigned char val;
+
+ val = loongson_spi_read_reg(loongson_spi_dev, LOONGSON_SPI_SPCR_REG);
+ val &= ~LOONGSON_SPI_SPCR_SPE;
+ loongson_spi_write_reg(loongson_spi_dev, LOONGSON_SPI_SPCR_REG, val);
+
+ loongson_spi_write_reg(loongson_spi_dev, LOONGSON_SPI_SPSR_REG,
+ (LOONGSON_SPI_SPSR_SPIF | LOONGSON_SPI_SPSR_WCOL));
+
+ val = loongson_spi_read_reg(loongson_spi_dev, LOONGSON_SPI_SPCR_REG);
+ val |= LOONGSON_SPI_SPCR_SPE;
+ loongson_spi_write_reg(loongson_spi_dev, LOONGSON_SPI_SPCR_REG, val);
+}
+
+int loongson_spi_init_master(struct device *dev, struct resource *res)
+{
+ struct spi_master *master;
+ struct loongson_spi *spi;
+ struct clk *clk;
+ int ret;
+
+ master = spi_alloc_master(dev, sizeof(struct loongson_spi));
+ if (master == NULL) {
+ dev_dbg(dev, "master allocation failed\n");
+ return -ENOMEM;
+ }
+
+ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
+ master->setup = loongson_spi_setup;
+ master->prepare_message = loongson_spi_prepare_message;
+ master->transfer_one = loongson_spi_transfer_one;
+ master->unprepare_message = loongson_spi_unprepare_message;
+ master->set_cs = loongson_spi_set_cs;
+ master->num_chipselect = 4;
+ master->dev.of_node = of_node_get(dev->of_node);
+ dev_set_drvdata(dev, master);
+
+ spi = spi_master_get_devdata(master);
+
+ spi->master = master;
+
+ spi->base = devm_ioremap(dev, res->start, resource_size(res));
+ if (spi->base == NULL) {
+ dev_err(dev, "cannot map io\n");
+ ret = -ENXIO;
+ goto free_master;
+ }
+
+ clk = devm_clk_get(dev, NULL);
+ if (!IS_ERR(clk))
+ spi->clk_rate = clk_get_rate(clk);
+
+ loongson_spi_reginit(spi);
+
+ spi->mode = 0;
+ if (of_get_property(dev->of_node, "spi-nocs", NULL))
+ spi->mode |= SPI_NO_CS;
+
+ ret = spi_register_master(master);
+ if (ret < 0)
+ goto free_master;
+
+ return ret;
+
+free_master:
+ kfree(master);
+ spi_master_put(master);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(loongson_spi_init_master);
+
+static int __maybe_unused loongson_spi_suspend(struct device *dev)
+{
+ struct loongson_spi *loongson_spi;
+ struct spi_master *master;
+
+ master = dev_get_drvdata(dev);
+ loongson_spi = spi_master_get_devdata(master);
+
+ loongson_spi->spcr = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_SPCR_REG);
+ loongson_spi->sper = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_SPER_REG);
+ loongson_spi->spsr = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_SPSR_REG);
+ loongson_spi->para = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_PARA_REG);
+ loongson_spi->sfcs = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_SFCS_REG);
+ loongson_spi->timi = loongson_spi_read_reg(loongson_spi, LOONGSON_SPI_TIMI_REG);
+
+ return 0;
+}
+
+static int __maybe_unused loongson_spi_resume(struct device *dev)
+{
+ struct loongson_spi *loongson_spi;
+ struct spi_master *master;
+
+ master = dev_get_drvdata(dev);
+ loongson_spi = spi_master_get_devdata(master);
+
+ loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_SPCR_REG, loongson_spi->spcr);
+ loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_SPER_REG, loongson_spi->sper);
+ loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_SPSR_REG, loongson_spi->spsr);
+ loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_PARA_REG, loongson_spi->para);
+ loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_SFCS_REG, loongson_spi->sfcs);
+ loongson_spi_write_reg(loongson_spi, LOONGSON_SPI_TIMI_REG, loongson_spi->timi);
+
+ return 0;
+}
+
+const struct dev_pm_ops loongson_spi_dev_pm_ops = {
+ .suspend = loongson_spi_suspend,
+ .resume = loongson_spi_resume,
+};
+EXPORT_SYMBOL_GPL(loongson_spi_dev_pm_ops);
+
+MODULE_DESCRIPTION("Loongson spi core driver");
+MODULE_LICENSE("GPL");
new file mode 100644
@@ -0,0 +1,89 @@
+// SPDX-License-Identifier: GPL-2.0+
+// PCI interface driver for Loongson SPI Support
+// Copyright (C) 2023 Loongson Technology Corporation Limited
+
+#include <linux/pci.h>
+
+#include "spi-loongson.h"
+
+static int loongson_spi_pci_register(struct pci_dev *pdev,
+ const struct pci_device_id *ent)
+{
+ int ret;
+ unsigned char v8;
+ struct resource res[2];
+ struct device *dev = &pdev->dev;
+
+ ret = pci_enable_device(pdev);
+ if (ret < 0) {
+ dev_err(dev, "cannot enable pci device\n");
+ goto err_out;
+ }
+
+ ret = pci_request_region(pdev, 0, "loongson-spi io");
+ if (ret < 0) {
+ dev_err(dev, "cannot request region 0.\n");
+ goto err_out;
+ }
+
+ res[0].start = pci_resource_start(pdev, 0);
+ res[0].end = pci_resource_end(pdev, 0);
+ ret = pci_read_config_byte(pdev, PCI_INTERRUPT_LINE, &v8);
+
+ if (ret == PCIBIOS_SUCCESSFUL) {
+ res[1].start = v8;
+ res[1].end = v8;
+ }
+
+ ret = loongson_spi_init_master(dev, res);
+ if (ret)
+ dev_err(dev, "failed to initialize master\n");
+
+err_out:
+ return ret;
+}
+
+static void loongson_spi_pci_unregister(struct pci_dev *pdev)
+{
+ pci_release_region(pdev, 0);
+}
+
+static struct pci_device_id loongson_spi_devices[] = {
+ {PCI_DEVICE(0x14, 0x7a0b)},
+ {PCI_DEVICE(0x14, 0x7a1b)},
+ {0, 0, 0, 0, 0, 0, 0}
+};
+MODULE_DEVICE_TABLE(pci, loongson_spi_devices);
+
+static struct pci_driver loongson_spi_pci_driver = {
+ .name = "loongson-spi-pci",
+ .id_table = loongson_spi_devices,
+ .probe = loongson_spi_pci_register,
+ .remove = loongson_spi_pci_unregister,
+ .driver = {
+ .bus = &pci_bus_type,
+ .pm = &loongson_spi_dev_pm_ops,
+ },
+};
+
+static int __init loongson_spi_pci_init(void)
+{
+ int ret;
+
+ ret = pci_register_driver(&loongson_spi_pci_driver);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static void __exit loongson_spi_pci_exit(void)
+{
+ pci_unregister_driver(&loongson_spi_pci_driver);
+}
+
+module_init(loongson_spi_pci_init);
+module_exit(loongson_spi_pci_exit);
+
+MODULE_DESCRIPTION("Loongson spi pci driver");
+MODULE_LICENSE("GPL");
new file mode 100644
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Platform driver for Loongson SPI Support
+// Copyright (C) 2023 Loongson Technology Corporation Limited
+
+#include <linux/platform_device.h>
+#include <linux/of.h>
+
+#include "spi-loongson.h"
+
+static int loongson_spi_platform_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ int ret;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res == NULL) {
+ dev_err(dev, "cannot get io resource memory\n");
+ return -ENOENT;
+ }
+
+ ret = loongson_spi_init_master(dev, res);
+ if (ret)
+ dev_err(dev, "failed to initialize master\n");
+
+ return ret;
+}
+
+static const struct of_device_id loongson_spi_id_table[] = {
+ { .compatible = "loongson,ls2k-spi", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, loongson_spi_id_table);
+
+static struct platform_driver loongson_spi_plat_driver = {
+ .probe = loongson_spi_platform_probe,
+ .driver = {
+ .name = "loongson-spi",
+ .owner = THIS_MODULE,
+ .bus = &platform_bus_type,
+ .pm = &loongson_spi_dev_pm_ops,
+ .of_match_table = loongson_spi_id_table,
+ },
+};
+
+static int __init loongson_spi_plat_init(void)
+{
+ int ret;
+
+ ret = platform_driver_register(&loongson_spi_plat_driver);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static void __exit loongson_spi_plat_exit(void)
+{
+ platform_driver_unregister(&loongson_spi_plat_driver);
+}
+
+module_init(loongson_spi_plat_init);
+module_exit(loongson_spi_plat_exit);
+
+MODULE_DESCRIPTION("Loongson spi platform driver");
+MODULE_LICENSE("GPL");
new file mode 100644
@@ -0,0 +1,41 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/* Header File for Loongson SPI Driver. */
+/* Copyright (C) 2023 Loongson Technology Corporation Limited */
+
+#ifndef __LINUX_SPI_LOONGSON_H
+#define __LINUX_SPI_LOONGSON_H
+
+#define LOONGSON_SPI_SPCR_REG 0x00
+#define LOONGSON_SPI_SPSR_REG 0x01
+#define LOONGSON_SPI_FIFO_REG 0x02
+#define LOONGSON_SPI_SPER_REG 0x03
+#define LOONGSON_SPI_PARA_REG 0x04
+#define LOONGSON_SPI_SFCS_REG 0x05
+#define LOONGSON_SPI_TIMI_REG 0x06
+
+/* Bits definition for Loongson SPI register */
+#define LOONGSON_SPI_PARA_MEM_EN BIT(0)
+#define LOONGSON_SPI_SPSR_SPIF BIT(7)
+#define LOONGSON_SPI_SPSR_WCOL BIT(6)
+#define LOONGSON_SPI_SPCR_SPE BIT(6)
+
+#define SPI_COMPLETION_TIMEOUT msecs_to_jiffies(2000)
+
+struct loongson_spi {
+ struct spi_master *master;
+ void __iomem *base;
+ int cs_active;
+ unsigned int hz;
+ unsigned char spcr;
+ unsigned char sper;
+ unsigned char spsr;
+ unsigned char para;
+ unsigned char sfcs;
+ unsigned char timi;
+ unsigned int mode;
+ u64 clk_rate;
+};
+
+extern int loongson_spi_init_master(struct device *dev, struct resource *res);
+extern const struct dev_pm_ops loongson_spi_dev_pm_ops;
+#endif /* __LINUX_SPI_LOONGSON_H */