+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * Copyright (C) 2006 Compulab, Ltd.
- * Mike Rapoport <mike@compulab.co.il>
- *
- * Derived from drivers/mtd/nand/h1910.c (removed in v3.10)
- * Copyright (C) 2002 Marius Gröger (mag@sysgo.de)
- * Copyright (c) 2001 Thomas Gleixner (gleixner@autronix.de)
- *
- * Overview:
- * This is a device driver for the NAND flash device found on the
- * CM-X270 board.
- */
-
-#include <linux/mtd/rawnand.h>
-#include <linux/mtd/partitions.h>
-#include <linux/slab.h>
-#include <linux/gpio.h>
-#include <linux/module.h>
-
-#include <asm/io.h>
-#include <asm/irq.h>
-#include <asm/mach-types.h>
-
-#include <mach/pxa2xx-regs.h>
-
-#define GPIO_NAND_CS (11)
-#define GPIO_NAND_RB (89)
-
-/* MTD structure for CM-X270 board */
-static struct mtd_info *cmx270_nand_mtd;
-
-/* remaped IO address of the device */
-static void __iomem *cmx270_nand_io;
-
-/*
- * Define static partitions for flash device
- */
-static const struct mtd_partition partition_info[] = {
- [0] = {
- .name = "cmx270-0",
- .offset = 0,
- .size = MTDPART_SIZ_FULL
- }
-};
-#define NUM_PARTITIONS (ARRAY_SIZE(partition_info))
-
-static u_char cmx270_read_byte(struct nand_chip *this)
-{
- return (readl(this->legacy.IO_ADDR_R) >> 16);
-}
-
-static void cmx270_write_buf(struct nand_chip *this, const u_char *buf,
- int len)
-{
- int i;
-
- for (i=0; i<len; i++)
- writel((*buf++ << 16), this->legacy.IO_ADDR_W);
-}
-
-static void cmx270_read_buf(struct nand_chip *this, u_char *buf, int len)
-{
- int i;
-
- for (i=0; i<len; i++)
- *buf++ = readl(this->legacy.IO_ADDR_R) >> 16;
-}
-
-static inline void nand_cs_on(void)
-{
- gpio_set_value(GPIO_NAND_CS, 0);
-}
-
-static void nand_cs_off(void)
-{
- dsb();
-
- gpio_set_value(GPIO_NAND_CS, 1);
-}
-
-/*
- * hardware specific access to control-lines
- */
-static void cmx270_hwcontrol(struct nand_chip *this, int dat,
- unsigned int ctrl)
-{
- unsigned int nandaddr = (unsigned int)this->legacy.IO_ADDR_W;
-
- dsb();
-
- if (ctrl & NAND_CTRL_CHANGE) {
- if ( ctrl & NAND_ALE )
- nandaddr |= (1 << 3);
- else
- nandaddr &= ~(1 << 3);
- if ( ctrl & NAND_CLE )
- nandaddr |= (1 << 2);
- else
- nandaddr &= ~(1 << 2);
- if ( ctrl & NAND_NCE )
- nand_cs_on();
- else
- nand_cs_off();
- }
-
- dsb();
- this->legacy.IO_ADDR_W = (void __iomem*)nandaddr;
- if (dat != NAND_CMD_NONE)
- writel((dat << 16), this->legacy.IO_ADDR_W);
-
- dsb();
-}
-
-/*
- * read device ready pin
- */
-static int cmx270_device_ready(struct nand_chip *this)
-{
- dsb();
-
- return (gpio_get_value(GPIO_NAND_RB));
-}
-
-/*
- * Main initialization routine
- */
-static int __init cmx270_init(void)
-{
- struct nand_chip *this;
- int ret;
-
- if (!(machine_is_armcore() && cpu_is_pxa27x()))
- return -ENODEV;
-
- ret = gpio_request(GPIO_NAND_CS, "NAND CS");
- if (ret) {
- pr_warn("CM-X270: failed to request NAND CS gpio\n");
- return ret;
- }
-
- gpio_direction_output(GPIO_NAND_CS, 1);
-
- ret = gpio_request(GPIO_NAND_RB, "NAND R/B");
- if (ret) {
- pr_warn("CM-X270: failed to request NAND R/B gpio\n");
- goto err_gpio_request;
- }
-
- gpio_direction_input(GPIO_NAND_RB);
-
- /* Allocate memory for MTD device structure and private data */
- this = kzalloc(sizeof(struct nand_chip), GFP_KERNEL);
- if (!this) {
- ret = -ENOMEM;
- goto err_kzalloc;
- }
-
- cmx270_nand_io = ioremap(PXA_CS1_PHYS, 12);
- if (!cmx270_nand_io) {
- pr_debug("Unable to ioremap NAND device\n");
- ret = -EINVAL;
- goto err_ioremap;
- }
-
- cmx270_nand_mtd = nand_to_mtd(this);
-
- /* Link the private data with the MTD structure */
- cmx270_nand_mtd->owner = THIS_MODULE;
-
- /* insert callbacks */
- this->legacy.IO_ADDR_R = cmx270_nand_io;
- this->legacy.IO_ADDR_W = cmx270_nand_io;
- this->legacy.cmd_ctrl = cmx270_hwcontrol;
- this->legacy.dev_ready = cmx270_device_ready;
-
- /* 15 us command delay time */
- this->legacy.chip_delay = 20;
- this->ecc.mode = NAND_ECC_SOFT;
- this->ecc.algo = NAND_ECC_HAMMING;
-
- /* read/write functions */
- this->legacy.read_byte = cmx270_read_byte;
- this->legacy.read_buf = cmx270_read_buf;
- this->legacy.write_buf = cmx270_write_buf;
-
- /* Scan to find existence of the device */
- ret = nand_scan(this, 1);
- if (ret) {
- pr_notice("No NAND device\n");
- goto err_scan;
- }
-
- /* Register the partitions */
- ret = mtd_device_register(cmx270_nand_mtd, partition_info,
- NUM_PARTITIONS);
- if (ret)
- goto err_scan;
-
- /* Return happy */
- return 0;
-
-err_scan:
- iounmap(cmx270_nand_io);
-err_ioremap:
- kfree(this);
-err_kzalloc:
- gpio_free(GPIO_NAND_RB);
-err_gpio_request:
- gpio_free(GPIO_NAND_CS);
-
- return ret;
-
-}
-module_init(cmx270_init);
-
-/*
- * Clean up routine
- */
-static void __exit cmx270_cleanup(void)
-{
- /* Release resources, unregister device */
- nand_release(mtd_to_nand(cmx270_nand_mtd));
-
- gpio_free(GPIO_NAND_RB);
- gpio_free(GPIO_NAND_CS);
-
- iounmap(cmx270_nand_io);
-
- kfree(mtd_to_nand(cmx270_nand_mtd));
-}
-module_exit(cmx270_cleanup);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
-MODULE_DESCRIPTION("NAND flash driver for Compulab CM-X270 Module");
projects / linux-block.git / commitdiff