[PATCH 3/3] mtd: spi-nor: Altera Quadspi Flash Controller v2 Platform driver

From: matthew.gerlach@linux.intel.com
To: vndao@altera.com, dwmw2@infradead.org,
	computersforpeace@gmail.com, boris.brezillon@free-electrons.com,
	marek.vasut@gmail.com, richard@nod.at,
	cyrille.pitchen@wedev4u.fr, robh+dt@kernel.org,
	mark.rutland@arm.com, linux-mtd@lists.infradead.org,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	gregkh@linuxfoundation.org, davem@davemloft.net,
	mchehab@kernel.org
Cc: Matthew Gerlach <matthew.gerlach@linux.intel.com>
Subject: [PATCH 3/3] mtd: spi-nor: Altera Quadspi Flash Controller v2 Platform driver
Date: Mon, 26 Jun 2017 09:13:39 -0700	[thread overview]
Message-ID: <1498493619-4633-4-git-send-email-matthew.gerlach@linux.intel.com> (raw)
In-Reply-To: <1498493619-4633-1-git-send-email-matthew.gerlach@linux.intel.com>

From: Matthew Gerlach <matthew.gerlach@linux.intel.com>

Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com>
---
 MAINTAINERS                                   |   1 +
 drivers/mtd/spi-nor/Kconfig                   |   5 +
 drivers/mtd/spi-nor/Makefile                  |   1 +
 drivers/mtd/spi-nor/altera-quadspi-platform.c | 137 ++++++++++++++++++++++++++
 4 files changed, 144 insertions(+)
 create mode 100644 drivers/mtd/spi-nor/altera-quadspi-platform.c

diff --git a/MAINTAINERS b/MAINTAINERS
index ae33fa6..c32bb98 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -653,6 +653,7 @@ M:	Matthew Gerlach <matthew.gerlach@linux.intel.com>
 L:	linux-mtd@lists.infradead.org
 S:	Maintained
 F:	drivers/mtd/spi-nor/altera-quadspi.c
+F:	drivers/mtd/spi-nor/altera-quadspi-platform.c
 F:	inclulde/linux/mtd/altera-quadspi.h
 
 ALTERA SYSTEM RESOURCE DRIVER FOR ARRIA10 DEVKIT
diff --git a/drivers/mtd/spi-nor/Kconfig b/drivers/mtd/spi-nor/Kconfig
index 89fe425..f3d5c01 100644
--- a/drivers/mtd/spi-nor/Kconfig
+++ b/drivers/mtd/spi-nor/Kconfig
@@ -118,4 +118,9 @@ config SPI_ALTERA_QUADSPI
         help
           Enable support for version 2 of Altera Quad SPI Flash Controller.
 
+config SPI_ALTERA_QUADSPI_PLATFORM
+	tristate "Platform support for Altera Quad SPI Flash Controller II"
+	help
+	  Platform driver support for  Altera Quad SPI Flash Controller II"
+
 endif # MTD_SPI_NOR
diff --git a/drivers/mtd/spi-nor/Makefile b/drivers/mtd/spi-nor/Makefile
index 024c6ac..042f87e 100644
--- a/drivers/mtd/spi-nor/Makefile
+++ b/drivers/mtd/spi-nor/Makefile
@@ -10,4 +10,5 @@ obj-$(CONFIG_SPI_INTEL_SPI)	+= intel-spi.o
 obj-$(CONFIG_SPI_INTEL_SPI_PLATFORM)	+= intel-spi-platform.o
 obj-$(CONFIG_SPI_STM32_QUADSPI)	+= stm32-quadspi.o
 obj-$(CONFIG_SPI_ALTERA_QUADSPI) += altera-quadspi.o
+obj-$(CONFIG_SPI_ALTERA_QUADSPI_PLATFORM) += altera-quadspi-platform.o
 
diff --git a/drivers/mtd/spi-nor/altera-quadspi-platform.c b/drivers/mtd/spi-nor/altera-quadspi-platform.c
new file mode 100644
index 0000000..c8d2a47
--- /dev/null
+++ b/drivers/mtd/spi-nor/altera-quadspi-platform.c
@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2014 Altera Corporation. All rights reserved.
+ * Copyright (C) 2017 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/module.h>
+#include <linux/mtd/altera-quadspi.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+
+static int altera_quadspi_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	void __iomem *csr_base;
+	void __iomem *data_base;
+	void __iomem *window_base = NULL;
+	u32 window_size = 0;
+	u32 flags = 0;
+	u32 bank;
+	int ret;
+	struct device_node *pp;
+
+	if (!np) {
+		dev_err(dev, "no device found\n");
+		return -ENODEV;
+	}
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "avl_csr");
+	csr_base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(csr_base)) {
+		dev_err(dev, "%s: ERROR: failed to map csr base\n", __func__);
+		return PTR_ERR(csr_base);
+	}
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "avl_mem");
+	data_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(data_base)) {
+		dev_err(dev, "%s: ERROR: failed to map data base\n", __func__);
+		return PTR_ERR(data_base);
+	}
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "avl_window");
+	if (res) {
+		window_base = NULL;
+		window_base = devm_ioremap_resource(dev, res);
+		if (IS_ERR(window_base)) {
+			dev_err(dev, "%s: ERROR: failed to map window base\n",
+				__func__);
+			return PTR_ERR(data_base);
+		}
+
+		of_property_read_u32(dev->of_node, "window-size", &window_size);
+
+		if (!window_size) {
+			dev_err(dev,
+				"alv_window defined, %s",
+				"but no window-size defined\n");
+			return -EINVAL;
+		}
+	}
+
+	if (of_property_read_bool(np, "read-bit-reverse"))
+		flags |= ALTERA_QUADSPI_FL_BITREV_READ;
+
+	if (of_property_read_bool(np, "write-bit-reverse"))
+		flags |= ALTERA_QUADSPI_FL_BITREV_WRITE;
+
+	ret = altera_quadspi_create(dev, csr_base, data_base,
+				    window_base, (size_t)window_size, flags);
+
+	if (ret) {
+		dev_err(dev, "failed to create qspi device\n");
+		return ret;
+	}
+
+	for_each_available_child_of_node(np, pp) {
+		of_property_read_u32(pp, "reg", &bank);
+		if (bank >= ALTERA_QUADSPI_MAX_NUM_FLASH_CHIP) {
+			dev_err(dev, "bad reg value %u >= %u\n", bank,
+				ALTERA_QUADSPI_MAX_NUM_FLASH_CHIP);
+			goto error;
+		}
+
+		if (altera_qspi_add_bank(dev, bank, pp)) {
+			dev_err(dev, "failed to add bank %u\n", bank);
+			goto error;
+		}
+	}
+
+	return 0;
+error:
+	altera_quadspi_remove_banks(dev);
+	return -EIO;
+}
+
+static int altera_quadspi_remove(struct platform_device *pdev)
+{
+	return altera_quadspi_remove_banks(&pdev->dev);
+}
+
+static const struct of_device_id altera_quadspi_id_table[] = {
+
+	{ .compatible = "altr,quadspi-v2",},
+	{}
+};
+MODULE_DEVICE_TABLE(of, altera_quadspi_id_table);
+
+static struct platform_driver altera_quadspi_driver = {
+	.driver = {
+		.name = "altera_quadspi_platform",
+		.of_match_table = altera_quadspi_id_table,
+	},
+	.probe = altera_quadspi_probe,
+	.remove = altera_quadspi_remove,
+};
+module_platform_driver(altera_quadspi_driver);
+
+MODULE_AUTHOR("Viet Nga Dao <vndao@altera.com>");
+MODULE_AUTHOR("Yong Sern Lau <lau.yong.sern@intel.com>");
+MODULE_AUTHOR("Matthew Gerlach <matthew.gerlach@linux.intel.com>");
+MODULE_DESCRIPTION("Altera QuadSPI Version 2 Platform Driver");
+MODULE_LICENSE("GPL v2");
-- 
2.7.4
