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openwrt/target/linux/bcm27xx/patches-4.19/950-0050-Add-SMI-NAND-driver.patch
Adrian Schmutzler 7d7aa2fd92 brcm2708: rename target to bcm27xx 
This change makes the names of Broadcom targets consistent by using
the common notation based on SoC/CPU ID (which is used internally
anyway), bcmXXXX instead of brcmXXXX.
This is even used for target TITLE in make menuconfig already,
only the short target name used brcm so far.

Despite, since subtargets range from bcm2708 to bcm2711, it seems
appropriate to use bcm27xx instead of bcm2708 (again, as already done
for BOARDNAME).

This also renames the packages brcm2708-userland and brcm2708-gpu-fw.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Acked-by: Álvaro Fernández Rojas <noltari@gmail.com>
2020-02-14 14:10:51 +01:00

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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>");
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