diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.9/950-0044-Add-SMI-NAND-driver.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.9/950-0044-Add-SMI-NAND-driver.patch | 357 |
1 files changed, 357 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.9/950-0044-Add-SMI-NAND-driver.patch b/target/linux/brcm2708/patches-4.9/950-0044-Add-SMI-NAND-driver.patch new file mode 100644 index 0000000..ec6010a --- /dev/null +++ b/target/linux/brcm2708/patches-4.9/950-0044-Add-SMI-NAND-driver.patch @@ -0,0 +1,357 @@ +From be64c4dbf6be17ce20ee214478509a3738256d46 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/Kconfig | 7 + + drivers/mtd/nand/Makefile | 1 + + drivers/mtd/nand/bcm2835_smi_nand.c | 267 +++++++++++++++++++++ + 4 files changed, 317 insertions(+) + create mode 100644 Documentation/devicetree/bindings/mtd/brcm,bcm2835-smi-nand.txt + create mode 100644 drivers/mtd/nand/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/Kconfig ++++ b/drivers/mtd/nand/Kconfig +@@ -41,6 +41,13 @@ 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/Makefile ++++ b/drivers/mtd/nand/Makefile +@@ -14,6 +14,7 @@ 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_BF5XX) += bf5xx_nand.o + obj-$(CONFIG_MTD_NAND_S3C2410) += s3c2410.o + obj-$(CONFIG_MTD_NAND_DAVINCI) += davinci_nand.o +--- /dev/null ++++ b/drivers/mtd/nand/bcm2835_smi_nand.c +@@ -0,0 +1,267 @@ ++/** ++ * 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/nand.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; ++ ++ /* First scan to find the device and get the page size */ ++ ++ if (nand_scan_ident(mtd, 1, NULL)) ++ return -ENXIO; ++ ++ /* Second phase scan */ ++ ++ if (nand_scan_tail(mtd)) ++ return -ENXIO; ++ ++ ret = mtd_device_parse_register(mtd, NULL, &ppdata, NULL, 0); ++ if (!ret) ++ return 0; ++ ++ 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>"); |