[PATCH v7 0/2] spi: loongson: add bus driver for the loongson spi

[PATCH v7 0/2] spi: loongson: add bus driver for the loongson spi

[Yinbo Zhu]

Loongson platform support spi hardware controller and this series patch
was to add spi driver and binding support.

Change in v2:
		1. This [PATCH v2 1/2] dt-bindings patch need depend on clk patch:
	 	   https://
		   lore.kernel.org/all/20230307115022.12846-1-zhuyinbo@loongson.cn/
		2. Remove the clock-names in spi yaml file.
		3. Add "loongson,ls7a-spi" compatible in spi yaml file.
		4. Add an || COMPILE_TEST and drop && PCI then add some CONFIG_PCI
		   macro to limit some pci code.
		5. Make the spi driver top code comment block that use C++ style.
		6. Drop spi->max_speed_hz.
		7. Add a spin_lock for loongson_spi_setup.
		8. Add a timeout and cpu_relax() in loongson_spi_write_read_8bit.
		9. Add spi_transfer_one and drop transfer and rework entire spi
		   driver that include some necessary changes.
		10. Use module_init replace subsys_initcall.
		11. About PM interface that I don't find any issue so I don't add
		    any changes.
Change in v3:
		1. This [PATCH v3 1/2] dt-bindings patch need depend on clk patch:
		   https://
		   lore.kernel.org/all/20230323025229.2971-1-zhuyinbo@loongson.cn/
		2. Drop the unused blank line in loongson,ls-spi.yaml file.
		3. Replace clock minItems with clock maxItems in yaml file.
		4. Separate spi driver into platform module, pci module and core
		   module.
		5. Replace DIV_ROUND_UP with DIV_ROUND_UP_ULL to fix compile error
		   "undefined reference to `__aeabi_uldivmod'" and  "__udivdi3 undefined"
		   that reported by test robot.
		6. Remove the spin lock.
		7. Clear the loongson_spi->hz and loongson_spi->mode in setup to fixup
		   the issue that multiple spi device transfer that maybe cause spi was
		   be misconfigured.
Change in v4:
		1. This [PATCH v4 1/2] dt-bindings patch need depend on clk patch:
		   https://
		   lore.kernel.org/all/20230323025229.2971-1-zhuyinbo@loongson.cn/
		2. Add "#include <linux/io.h>" in spi-loongson-core.c for fix the compile
		   issue which devm_ioremap no declaration.
		3. Add "EXPORT_SYMBOL_GPL(loongson_spi_dev_pm_ops)" in
		   spi-loongson-core.c for fix the compile issue which
		   loongson_spi_dev_pm_ops undefined.
Change in v5:
		1. Get rid of the clock patch's dependency and open-code the clock IDs.
		2. Fixup checkpatch issue that by installed ply and gitpython package
		   locally, but this series of patch's code doesn't have any change.
Change in v6:
		1. Remove the "#include <dt-bindings/clock/loongson,ls2k-clk.h>" in
		   yaml file.
Change in v7:
		1. Remove the "loongson,ls7a-spi" and change yaml file name as
		   "loongson,ls2k-spi.yaml".
		2. Use module_pci_driver and module_platform_driver to replace
		   module_init and module_exit.
		3. Drop ".owner	= THIS_MODULE" in spi platform driver.
		4. Add devm_spi_alloc_master devm_spi_register_master to simplify code.
		5. Add pci_disable_device() in loongson_spi_pci_unregister.

Yinbo Zhu (2):
  dt-bindings: spi: add loongson spi
  spi: loongson: add bus driver for the loongson spi controller

 .../bindings/spi/loongson,ls2k-spi.yaml       |  41 +++
 MAINTAINERS                                   |  10 +
 drivers/spi/Kconfig                           |  31 ++
 drivers/spi/Makefile                          |   3 +
 drivers/spi/spi-loongson-core.c               | 292 ++++++++++++++++++
 drivers/spi/spi-loongson-pci.c                |  72 +++++
 drivers/spi/spi-loongson-plat.c               |  47 +++
 drivers/spi/spi-loongson.h                    |  41 +++
 8 files changed, 537 insertions(+)

-- 
2.20.1

[PATCH v7 1/2] dt-bindings: spi: add loongson spi

[Yinbo Zhu]

Add the Loongson platform spi binding with DT schema format using
json-schema.

Signed-off-by: Yinbo Zhu <zhuyinbo@loongson.cn>
---
 .../bindings/spi/loongson,ls2k-spi.yaml       | 41 +++++++++++++++++++
 MAINTAINERS                                   |  6 +++
 2 files changed, 47 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/loongson,ls2k-spi.yaml

diff --git a/Documentation/devicetree/bindings/spi/loongson,ls2k-spi.yaml b/Documentation/devicetree/bindings/spi/loongson,ls2k-spi.yaml
new file mode 100644
index 000000000000..d0be6e5378d7
--- /dev/null
+++ b/Documentation/devicetree/bindings/spi/loongson,ls2k-spi.yaml
@@ -0,0 +1,41 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/loongson,ls2k-spi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Loongson SPI controller
+
+maintainers:
+  - Yinbo Zhu <zhuyinbo@loongson.cn>
+
+allOf:
+  - $ref: /schemas/spi/spi-controller.yaml#
+
+properties:
+  compatible:
+    enum:
+      - loongson,ls2k-spi
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    spi0: spi@1fff0220{
+        compatible = "loongson,ls2k-spi";
+        reg = <0x1fff0220 0x10>;
+        clocks = <&clk 17>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 25a0981c74b6..9bc2158c735d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12157,6 +12157,12 @@ S:	Maintained
 F:	Documentation/devicetree/bindings/clock/loongson,ls2k-clk.yaml
 F:	include/dt-bindings/clock/loongson,ls2k-clk.h
 
+LOONGSON SPI DRIVER
+M:	Yinbo Zhu <zhuyinbo@loongson.cn>
+L:	linux-spi@vger.kernel.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/spi/loongson,ls-spi.yaml
+
 LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI)
 M:	Sathya Prakash <sathya.prakash@broadcom.com>
 M:	Sreekanth Reddy <sreekanth.reddy@broadcom.com>
-- 
2.20.1

[PATCH v7 2/2] spi: loongson: add bus driver for the loongson spi controller

[Yinbo Zhu]

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 | 292 ++++++++++++++++++++++++++++++++
 drivers/spi/spi-loongson-pci.c  |  72 ++++++++
 drivers/spi/spi-loongson-plat.c |  47 +++++
 drivers/spi/spi-loongson.h      |  41 +++++
 7 files changed, 490 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

diff --git a/MAINTAINERS b/MAINTAINERS
index 9bc2158c735d..f2b1ad2c785a 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -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>
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index cbf60b6a931c..87f87ee35d27 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -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
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index d87cf75bee6a..a4931aa64476 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -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
diff --git a/drivers/spi/spi-loongson-core.c b/drivers/spi/spi-loongson-core.c
new file mode 100644
index 000000000000..f789ad8d441b
--- /dev/null
+++ b/drivers/spi/spi-loongson-core.c
@@ -0,0 +1,292 @@
+// 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;
+
+	master = devm_spi_alloc_master(dev, sizeof(struct loongson_spi));
+	if (master == NULL) {
+		dev_info(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");
+		return -ENXIO;
+	}
+
+	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;
+
+	return devm_spi_register_master(dev, master);
+}
+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");
diff --git a/drivers/spi/spi-loongson-pci.c b/drivers/spi/spi-loongson-pci.c
new file mode 100644
index 000000000000..f8aaad6577bd
--- /dev/null
+++ b/drivers/spi/spi-loongson-pci.c
@@ -0,0 +1,72 @@
+// 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(pdev);
+}
+
+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,
+	},
+};
+module_pci_driver(loongson_spi_pci_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..acf0fa38ce4b
--- /dev/null
+++ b/drivers/spi/spi-loongson-plat.c
@@ -0,0 +1,47 @@
+// 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",
+		.bus = &platform_bus_type,
+		.pm = &loongson_spi_dev_pm_ops,
+		.of_match_table = loongson_spi_id_table,
+	},
+};
+module_platform_driver(loongson_spi_plat_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
+#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 */
-- 
2.20.1

Re: [PATCH v7 1/2] dt-bindings: spi: add loongson spi

[Krzysztof Kozlowski]

On 12/04/2023 06:51, Yinbo Zhu wrote:
> Add the Loongson platform spi binding with DT schema format using
> json-schema.
> 
> Signed-off-by: Yinbo Zhu <zhuyinbo@loongson.cn>


Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>


This is an automated instruction, just in case, because many review tags
are being ignored. If you do not know the process, here is a short
explanation:

Please add Acked-by/Reviewed-by/Tested-by tags when posting new
versions, under or above your Signed-off-by tag. Tools like b4 can help
here. However, there's no need to repost patches *only* to add the tags.
The upstream maintainer will do that for acks received on the version
they apply.

https://elixir.bootlin.com/linux/v5.17/source/Documentation/process/submitting-patches.rst#L540

Best regards,
Krzysztof

Re: [PATCH v7 1/2] dt-bindings: spi: add loongson spi

[kernel test robot]

Hi Yinbo,

kernel test robot noticed the following build warnings:

[auto build test WARNING on broonie-spi/for-next]
[also build test WARNING on robh/for-next krzk-dt/for-next linus/master v6.3-rc6 next-20230413]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Yinbo-Zhu/dt-bindings-spi-add-loongson-spi/20230412-125222
base:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next
patch link:    https://lore.kernel.org/r/20230412045152.4694-2-zhuyinbo%40loongson.cn
patch subject: [PATCH v7 1/2] dt-bindings: spi: add loongson spi
reproduce:
        # https://github.com/intel-lab-lkp/linux/commit/e230989729f1d1e10c49d1903a5c76a5b8b81f95
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Yinbo-Zhu/dt-bindings-spi-add-loongson-spi/20230412-125222
        git checkout e230989729f1d1e10c49d1903a5c76a5b8b81f95
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        make htmldocs

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304141851.mUss7Eyn-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> Warning: MAINTAINERS references a file that doesn't exist: Documentation/devicetree/bindings/spi/loongson,ls-spi.yaml

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests

Re: [PATCH v7 1/2] dt-bindings: spi: add loongson spi

[Krzysztof Kozlowski]

On 12/04/2023 06:51, Yinbo Zhu wrote:
> +LOONGSON SPI DRIVER
> +M:	Yinbo Zhu <zhuyinbo@loongson.cn>
> +L:	linux-spi@vger.kernel.org
> +S:	Maintained
> +F:	Documentation/devicetree/bindings/spi/loongson,ls-spi.yaml

The path is not correct.

Best regards,
Krzysztof

Re: [PATCH v7 2/2] spi: loongson: add bus driver for the loongson spi controller

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 532 bytes --]

On Wed, Apr 12, 2023 at 12:51:52PM +0800, Yinbo Zhu wrote:

> +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);

This is missing a call to spi_controller_suspend(), and similarly resume
is missing a call to spi_controller_resume().  Otherwise this looks
good.

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

Re: [PATCH v7 0/2] spi: loongson: add bus driver for the loongson spi

[Krzysztof Kozlowski]

On 12/04/2023 06:51, Yinbo Zhu wrote:
> Loongson platform support spi hardware controller and this series patch
> was to add spi driver and binding support.
> 
> Change in v2:
> 		1. This [PATCH v2 1/2] dt-bindings patch need depend on clk patch:
> 	 	   https://

Can you stop Ccing fake address "loongson-kernel@lists.loongnix.cn"? It
does not exist. Remove it from all submissions.

Best regards,
Krzysztof

Re: [PATCH v7 1/2] dt-bindings: spi: add loongson spi

[zhuyinbo]

在 2023/4/14 下午7:13, Krzysztof Kozlowski 写道:
> On 12/04/2023 06:51, Yinbo Zhu wrote:
>> +LOONGSON SPI DRIVER
>> +M:	Yinbo Zhu <zhuyinbo@loongson.cn>
>> +L:	linux-spi@vger.kernel.org
>> +S:	Maintained
>> +F:	Documentation/devicetree/bindings/spi/loongson,ls-spi.yaml
> 
> The path is not correct.
okay, I will fix it.

Thanks.
> 
> Best regards,
> Krzysztof
> 

Re: [PATCH v7 1/2] dt-bindings: spi: add loongson spi

[zhuyinbo]

在 2023/4/14 下午6:57, kernel test robot 写道:
> Hi Yinbo,
> 
> kernel test robot noticed the following build warnings:
> 
> [auto build test WARNING on broonie-spi/for-next]
> [also build test WARNING on robh/for-next krzk-dt/for-next linus/master v6.3-rc6 next-20230413]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Yinbo-Zhu/dt-bindings-spi-add-loongson-spi/20230412-125222
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next
> patch link:    https://lore.kernel.org/r/20230412045152.4694-2-zhuyinbo%40loongson.cn
> patch subject: [PATCH v7 1/2] dt-bindings: spi: add loongson spi
> reproduce:
>          # https://github.com/intel-lab-lkp/linux/commit/e230989729f1d1e10c49d1903a5c76a5b8b81f95
>          git remote add linux-review https://github.com/intel-lab-lkp/linux
>          git fetch --no-tags linux-review Yinbo-Zhu/dt-bindings-spi-add-loongson-spi/20230412-125222
>          git checkout e230989729f1d1e10c49d1903a5c76a5b8b81f95
>          make menuconfig
>          # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
>          make htmldocs
> 
> If you fix the issue, kindly add following tag where applicable
> | Reported-by: kernel test robot <lkp@intel.com>
> | Link: https://lore.kernel.org/oe-kbuild-all/202304141851.mUss7Eyn-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>):
> 
>>> Warning: MAINTAINERS references a file that doesn't exist: Documentation/devicetree/bindings/spi/loongson,ls-spi.yaml
I will rename this path to fixup this warning.
> 

Re: [PATCH v7 2/2] spi: loongson: add bus driver for the loongson spi controller

[zhuyinbo]

在 2023/4/15 上午2:32, Mark Brown 写道:
> On Wed, Apr 12, 2023 at 12:51:52PM +0800, Yinbo Zhu wrote:
> 
>> +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);
> 
> This is missing a call to spi_controller_suspend(), and similarly resume
> is missing a call to spi_controller_resume().  Otherwise this looks
> good.
okay, I will add it.

Thanks.
> 

Re: [PATCH v7 0/2] spi: loongson: add bus driver for the loongson spi

[zhuyinbo]

在 2023/4/15 上午4:43, Krzysztof Kozlowski 写道:
> On 12/04/2023 06:51, Yinbo Zhu wrote:
>> Loongson platform support spi hardware controller and this series patch
>> was to add spi driver and binding support.
>>
>> Change in v2:
>> 		1. This [PATCH v2 1/2] dt-bindings patch need depend on clk patch:
>> 	 	   https://
> 
> Can you stop Ccing fake address "loongson-kernel@lists.loongnix.cn"? It
> does not exist. Remove it from all submissions.Recently, There was some issue with the company's email server, causing
this mail list "loongson-kernel@lists.loongnix.cn" to only accept
internal emails and not accpet external emails. The company's IT is
working to fix this issue. and Ccing this mail list is an internal
requirement.  I will not send emails to this mail list until this email
sever issue is resolved.

Thanks.
> 
> Best regards,
> Krzysztof
> 

Re: [PATCH v7 0/2] spi: loongson: add bus driver for the loongson spi

[Krzysztof Kozlowski]

On 18/04/2023 04:53, zhuyinbo wrote:
> 
> 
> 在 2023/4/15 上午4:43, Krzysztof Kozlowski 写道:
>> On 12/04/2023 06:51, Yinbo Zhu wrote:
>>> Loongson platform support spi hardware controller and this series patch
>>> was to add spi driver and binding support.
>>>
>>> Change in v2:
>>> 		1. This [PATCH v2 1/2] dt-bindings patch need depend on clk patch:
>>> 	 	   https://
>>
>> Can you stop Ccing fake address "loongson-kernel@lists.loongnix.cn"? It
>> does not exist. Remove it from all submissions.Recently, There was some issue with the company's email server, causing
> this mail list "loongson-kernel@lists.loongnix.cn" to only accept
> internal emails and not accpet external emails. The company's IT is
> working to fix this issue. and Ccing this mail list is an internal
> requirement.  I will not send emails to this mail list until this email
> sever issue is resolved.

You can always Bcc it, if you have such requirement. However your
internal requirements should not cause my removing all the time multiple
bounces...

Best regards,
Krzysztof

Re: [PATCH v7 0/2] spi: loongson: add bus driver for the loongson spi

[zhuyinbo]

在 2023/4/18 下午3:06, Krzysztof Kozlowski 写道:
> On 18/04/2023 04:53, zhuyinbo wrote:
>>
>>
>> 在 2023/4/15 上午4:43, Krzysztof Kozlowski 写道:
>>> On 12/04/2023 06:51, Yinbo Zhu wrote:
>>>> Loongson platform support spi hardware controller and this series patch
>>>> was to add spi driver and binding support.
>>>>
>>>> Change in v2:
>>>> 		1. This [PATCH v2 1/2] dt-bindings patch need depend on clk patch:
>>>> 	 	   https://
>>>
>>> Can you stop Ccing fake address "loongson-kernel@lists.loongnix.cn"? It
>>> does not exist. Remove it from all submissions.Recently, There was some issue with the company's email server, causing
>> this mail list "loongson-kernel@lists.loongnix.cn" to only accept
>> internal emails and not accpet external emails. The company's IT is
>> working to fix this issue. and Ccing this mail list is an internal
>> requirement.  I will not send emails to this mail list until this email
>> sever issue is resolved.
> 
> You can always Bcc it, if you have such requirement. However your
> internal requirements should not cause my removing all the time multiple
> bounces...
> 

okay, I got it.

Thanks.
> Best regards,
> Krzysztof
> 

Re: [PATCH v7 0/2] spi: loongson: add bus driver for the loongson spi

[zhuyinbo]

在 2023/4/18 下午3:06, Krzysztof Kozlowski 写道:
> On 18/04/2023 04:53, zhuyinbo wrote:
>>
>>
>> 在 2023/4/15 上午4:43, Krzysztof Kozlowski 写道:
>>> On 12/04/2023 06:51, Yinbo Zhu wrote:
>>>> Loongson platform support spi hardware controller and this series patch
>>>> was to add spi driver and binding support.
>>>>
>>>> Change in v2:
>>>> 		1. This [PATCH v2 1/2] dt-bindings patch need depend on clk patch:
>>>> 	 	   https://
>>>
>>> Can you stop Ccing fake address "loongson-kernel@lists.loongnix.cn"? It
>>> does not exist. Remove it from all submissions.Recently, There was some issue with the company's email server, causing
>> this mail list "loongson-kernel@lists.loongnix.cn" to only accept
>> internal emails and not accpet external emails. The company's IT is
>> working to fix this issue. and Ccing this mail list is an internal
>> requirement.  I will not send emails to this mail list until this email
>> sever issue is resolved.
> 
> You can always Bcc it, if you have such requirement. However your
> internal requirements should not cause my removing all the time multiple
> bounces...

The company' IT had fix that mail list server issue and ccing that mail
list "loongson-kernel@lists.loongnix.cn" that will not cause your
removing all the time multiple bounces.

Thanks.
> 
> Best regards,
> Krzysztof
>