+++ /dev/null
-From 06d1fce502f478f7e554c591a68cd42cc861e976 Mon Sep 17 00:00:00 2001
-From: Luke Wren <wren6991@gmail.com>
-Date: Sat, 5 Sep 2015 01:16:10 +0100
-Subject: [PATCH] Add SMI NAND driver
-
-Signed-off-by: Luke Wren <wren6991@gmail.com>
----
- .../bindings/mtd/brcm,bcm2835-smi-nand.txt | 42 +++
- drivers/mtd/nand/raw/Kconfig | 7 +
- drivers/mtd/nand/raw/Makefile | 1 +
- drivers/mtd/nand/raw/bcm2835_smi_nand.c | 258 ++++++++++++++++++
- 4 files changed, 308 insertions(+)
- create mode 100644 Documentation/devicetree/bindings/mtd/brcm,bcm2835-smi-nand.txt
- create mode 100644 drivers/mtd/nand/raw/bcm2835_smi_nand.c
-
---- /dev/null
-+++ b/Documentation/devicetree/bindings/mtd/brcm,bcm2835-smi-nand.txt
-@@ -0,0 +1,42 @@
-+* BCM2835 SMI NAND flash
-+
-+This driver is a shim between the BCM2835 SMI driver (SMI is a peripheral for
-+talking to parallel register interfaces) and Linux's MTD layer.
-+
-+Required properties:
-+- compatible: "brcm,bcm2835-smi-nand"
-+- status: "okay"
-+
-+Optional properties:
-+- partition@n, where n is an integer from a consecutive sequence starting at 0
-+ - Difficult to store partition table on NAND device - normally put it
-+ in the source code, kernel bootparams, or device tree (the best way!)
-+ - Sub-properties:
-+ - label: the partition name, as shown by mtdinfo /dev/mtd*
-+ - reg: the size and offset of this partition.
-+ - (optional) read-only: an empty property flagging as read only
-+
-+Example:
-+
-+nand: flash@0 {
-+ compatible = "brcm,bcm2835-smi-nand";
-+ status = "okay";
-+
-+ partition@0 {
-+ label = "stage2";
-+ // 128k
-+ reg = <0 0x20000>;
-+ read-only;
-+ };
-+ partition@1 {
-+ label = "firmware";
-+ // 16M
-+ reg = <0x20000 0x1000000>;
-+ read-only;
-+ };
-+ partition@2 {
-+ label = "root";
-+ // 2G
-+ reg = <0x1020000 0x80000000>;
-+ };
-+};
-\ No newline at end of file
---- a/drivers/mtd/nand/raw/Kconfig
-+++ b/drivers/mtd/nand/raw/Kconfig
-@@ -40,6 +40,13 @@ config MTD_SM_COMMON
- tristate
- default n
-
-+config MTD_NAND_BCM2835_SMI
-+ tristate "Use Broadcom's Secondary Memory Interface as a NAND controller (BCM283x)"
-+ depends on BCM2835_SMI
-+ default m
-+ help
-+ Uses the BCM2835's SMI peripheral as a NAND controller.
-+
- config MTD_NAND_DENALI
- tristate
-
---- a/drivers/mtd/nand/raw/Makefile
-+++ b/drivers/mtd/nand/raw/Makefile
-@@ -11,6 +11,7 @@ obj-$(CONFIG_MTD_NAND_DENALI) += denali
- obj-$(CONFIG_MTD_NAND_DENALI_PCI) += denali_pci.o
- obj-$(CONFIG_MTD_NAND_DENALI_DT) += denali_dt.o
- obj-$(CONFIG_MTD_NAND_AU1550) += au1550nd.o
-+obj-$(CONFIG_MTD_NAND_BCM2835_SMI) += bcm2835_smi_nand.o
- obj-$(CONFIG_MTD_NAND_S3C2410) += s3c2410.o
- obj-$(CONFIG_MTD_NAND_TANGO) += tango_nand.o
- obj-$(CONFIG_MTD_NAND_DAVINCI) += davinci_nand.o
---- /dev/null
-+++ b/drivers/mtd/nand/raw/bcm2835_smi_nand.c
-@@ -0,0 +1,258 @@
-+/**
-+ * NAND flash driver for Broadcom Secondary Memory Interface
-+ *
-+ * Written by Luke Wren <luke@raspberrypi.org>
-+ * Copyright (c) 2015, Raspberry Pi (Trading) Ltd.
-+ *
-+ * Redistribution and use in source and binary forms, with or without
-+ * modification, are permitted provided that the following conditions
-+ * are met:
-+ * 1. Redistributions of source code must retain the above copyright
-+ * notice, this list of conditions, and the following disclaimer,
-+ * without modification.
-+ * 2. Redistributions in binary form must reproduce the above copyright
-+ * notice, this list of conditions and the following disclaimer in the
-+ * documentation and/or other materials provided with the distribution.
-+ * 3. The names of the above-listed copyright holders may not be used
-+ * to endorse or promote products derived from this software without
-+ * specific prior written permission.
-+ *
-+ * ALTERNATIVELY, this software may be distributed under the terms of the
-+ * GNU General Public License ("GPL") version 2, as published by the Free
-+ * Software Foundation.
-+ *
-+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
-+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
-+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
-+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
-+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
-+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-+ */
-+
-+#include <linux/kernel.h>
-+#include <linux/module.h>
-+#include <linux/of.h>
-+#include <linux/platform_device.h>
-+#include <linux/slab.h>
-+#include <linux/mtd/rawnand.h>
-+#include <linux/mtd/partitions.h>
-+
-+#include <linux/broadcom/bcm2835_smi.h>
-+
-+#define DEVICE_NAME "bcm2835-smi-nand"
-+#define DRIVER_NAME "smi-nand-bcm2835"
-+
-+struct bcm2835_smi_nand_host {
-+ struct bcm2835_smi_instance *smi_inst;
-+ struct nand_chip nand_chip;
-+ struct mtd_info mtd;
-+ struct device *dev;
-+};
-+
-+/****************************************************************************
-+*
-+* NAND functionality implementation
-+*
-+****************************************************************************/
-+
-+#define SMI_NAND_CLE_PIN 0x01
-+#define SMI_NAND_ALE_PIN 0x02
-+
-+static inline void bcm2835_smi_nand_cmd_ctrl(struct mtd_info *mtd, int cmd,
-+ unsigned int ctrl)
-+{
-+ uint32_t cmd32 = cmd;
-+ uint32_t addr = ~(SMI_NAND_CLE_PIN | SMI_NAND_ALE_PIN);
-+ struct bcm2835_smi_nand_host *host = dev_get_drvdata(mtd->dev.parent);
-+ struct bcm2835_smi_instance *inst = host->smi_inst;
-+
-+ if (ctrl & NAND_CLE)
-+ addr |= SMI_NAND_CLE_PIN;
-+ if (ctrl & NAND_ALE)
-+ addr |= SMI_NAND_ALE_PIN;
-+ /* Lower ALL the CS pins! */
-+ if (ctrl & NAND_NCE)
-+ addr &= (SMI_NAND_CLE_PIN | SMI_NAND_ALE_PIN);
-+
-+ bcm2835_smi_set_address(inst, addr);
-+
-+ if (cmd != NAND_CMD_NONE)
-+ bcm2835_smi_write_buf(inst, &cmd32, 1);
-+}
-+
-+static inline uint8_t bcm2835_smi_nand_read_byte(struct mtd_info *mtd)
-+{
-+ uint8_t byte;
-+ struct bcm2835_smi_nand_host *host = dev_get_drvdata(mtd->dev.parent);
-+ struct bcm2835_smi_instance *inst = host->smi_inst;
-+
-+ bcm2835_smi_read_buf(inst, &byte, 1);
-+ return byte;
-+}
-+
-+static inline void bcm2835_smi_nand_write_byte(struct mtd_info *mtd,
-+ uint8_t byte)
-+{
-+ struct bcm2835_smi_nand_host *host = dev_get_drvdata(mtd->dev.parent);
-+ struct bcm2835_smi_instance *inst = host->smi_inst;
-+
-+ bcm2835_smi_write_buf(inst, &byte, 1);
-+}
-+
-+static inline void bcm2835_smi_nand_write_buf(struct mtd_info *mtd,
-+ const uint8_t *buf, int len)
-+{
-+ struct bcm2835_smi_nand_host *host = dev_get_drvdata(mtd->dev.parent);
-+ struct bcm2835_smi_instance *inst = host->smi_inst;
-+
-+ bcm2835_smi_write_buf(inst, buf, len);
-+}
-+
-+static inline void bcm2835_smi_nand_read_buf(struct mtd_info *mtd,
-+ uint8_t *buf, int len)
-+{
-+ struct bcm2835_smi_nand_host *host = dev_get_drvdata(mtd->dev.parent);
-+ struct bcm2835_smi_instance *inst = host->smi_inst;
-+
-+ bcm2835_smi_read_buf(inst, buf, len);
-+}
-+
-+/****************************************************************************
-+*
-+* Probe and remove functions
-+*
-+***************************************************************************/
-+
-+static int bcm2835_smi_nand_probe(struct platform_device *pdev)
-+{
-+ struct bcm2835_smi_nand_host *host;
-+ struct nand_chip *this;
-+ struct mtd_info *mtd;
-+ struct device *dev = &pdev->dev;
-+ struct device_node *node = dev->of_node, *smi_node;
-+ struct mtd_part_parser_data ppdata;
-+ struct smi_settings *smi_settings;
-+ struct bcm2835_smi_instance *smi_inst;
-+ int ret = -ENXIO;
-+
-+ if (!node) {
-+ dev_err(dev, "No device tree node supplied!");
-+ return -EINVAL;
-+ }
-+
-+ smi_node = of_parse_phandle(node, "smi_handle", 0);
-+
-+ /* Request use of SMI peripheral: */
-+ smi_inst = bcm2835_smi_get(smi_node);
-+
-+ if (!smi_inst) {
-+ dev_err(dev, "Could not register with SMI.");
-+ return -EPROBE_DEFER;
-+ }
-+
-+ /* Set SMI timing and bus width */
-+
-+ smi_settings = bcm2835_smi_get_settings_from_regs(smi_inst);
-+
-+ smi_settings->data_width = SMI_WIDTH_8BIT;
-+ smi_settings->read_setup_time = 2;
-+ smi_settings->read_hold_time = 1;
-+ smi_settings->read_pace_time = 1;
-+ smi_settings->read_strobe_time = 3;
-+
-+ smi_settings->write_setup_time = 2;
-+ smi_settings->write_hold_time = 1;
-+ smi_settings->write_pace_time = 1;
-+ smi_settings->write_strobe_time = 3;
-+
-+ bcm2835_smi_set_regs_from_settings(smi_inst);
-+
-+ host = devm_kzalloc(dev, sizeof(struct bcm2835_smi_nand_host),
-+ GFP_KERNEL);
-+ if (!host)
-+ return -ENOMEM;
-+
-+ host->dev = dev;
-+ host->smi_inst = smi_inst;
-+
-+ platform_set_drvdata(pdev, host);
-+
-+ /* Link the structures together */
-+
-+ this = &host->nand_chip;
-+ mtd = &host->mtd;
-+ mtd->priv = this;
-+ mtd->owner = THIS_MODULE;
-+ mtd->dev.parent = dev;
-+ mtd->name = DRIVER_NAME;
-+
-+ /* 20 us command delay time... */
-+ this->chip_delay = 20;
-+
-+ this->priv = host;
-+ this->cmd_ctrl = bcm2835_smi_nand_cmd_ctrl;
-+ this->read_byte = bcm2835_smi_nand_read_byte;
-+ this->write_byte = bcm2835_smi_nand_write_byte;
-+ this->write_buf = bcm2835_smi_nand_write_buf;
-+ this->read_buf = bcm2835_smi_nand_read_buf;
-+
-+ this->ecc.mode = NAND_ECC_SOFT;
-+
-+ /* Should never be accessed directly: */
-+
-+ this->IO_ADDR_R = (void *)0xdeadbeef;
-+ this->IO_ADDR_W = (void *)0xdeadbeef;
-+
-+ /* Scan to find the device and get the page size */
-+
-+ if (nand_scan(mtd, 1))
-+ return -ENXIO;
-+
-+ nand_release(mtd);
-+ return -EINVAL;
-+}
-+
-+static int bcm2835_smi_nand_remove(struct platform_device *pdev)
-+{
-+ struct bcm2835_smi_nand_host *host = platform_get_drvdata(pdev);
-+
-+ nand_release(&host->mtd);
-+
-+ return 0;
-+}
-+
-+/****************************************************************************
-+*
-+* Register the driver with device tree
-+*
-+***************************************************************************/
-+
-+static const struct of_device_id bcm2835_smi_nand_of_match[] = {
-+ {.compatible = "brcm,bcm2835-smi-nand",},
-+ { /* sentinel */ }
-+};
-+
-+MODULE_DEVICE_TABLE(of, bcm2835_smi_nand_of_match);
-+
-+static struct platform_driver bcm2835_smi_nand_driver = {
-+ .probe = bcm2835_smi_nand_probe,
-+ .remove = bcm2835_smi_nand_remove,
-+ .driver = {
-+ .name = DRIVER_NAME,
-+ .owner = THIS_MODULE,
-+ .of_match_table = bcm2835_smi_nand_of_match,
-+ },
-+};
-+
-+module_platform_driver(bcm2835_smi_nand_driver);
-+
-+MODULE_ALIAS("platform:smi-nand-bcm2835");
-+MODULE_LICENSE("GPL");
-+MODULE_DESCRIPTION
-+ ("Driver for NAND chips using Broadcom Secondary Memory Interface");
-+MODULE_AUTHOR("Luke Wren <luke@raspberrypi.org>");
projects / openwrt / openwrt.git / blobdiff