/* * drivers/mtd/nand/ams-delta.c * * Copyright (C) 2006 Jonathan McDowell * * Derived from drivers/mtd/toto.c * Converted to platform driver by Janusz Krzysztofik * Partially stolen from drivers/mtd/nand/plat_nand.c * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Overview: * This is a device driver for the NAND flash device found on the * Amstrad E3 (Delta). */ #include #include #include #include #include #include #include #include #include #include #include #include /* * MTD structure for E3 (Delta) */ static struct mtd_info *ams_delta_mtd = NULL; /* * Define partitions for flash devices */ static struct mtd_partition partition_info[] = { { .name = "Kernel", .offset = 0, .size = 3 * SZ_1M + SZ_512K }, { .name = "u-boot", .offset = 3 * SZ_1M + SZ_512K, .size = SZ_256K }, { .name = "u-boot params", .offset = 3 * SZ_1M + SZ_512K + SZ_256K, .size = SZ_256K }, { .name = "Amstrad LDR", .offset = 4 * SZ_1M, .size = SZ_256K }, { .name = "File system", .offset = 4 * SZ_1M + 1 * SZ_256K, .size = 27 * SZ_1M }, { .name = "PBL reserved", .offset = 32 * SZ_1M - 3 * SZ_256K, .size = 3 * SZ_256K }, }; static void ams_delta_write_byte(struct mtd_info *mtd, u_char byte) { struct nand_chip *this = mtd_to_nand(mtd); void __iomem *io_base = this->priv; writew(0, io_base + OMAP_MPUIO_IO_CNTL); writew(byte, this->IO_ADDR_W); gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_NWE, 0); ndelay(40); gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_NWE, 1); } static u_char ams_delta_read_byte(struct mtd_info *mtd) { u_char res; struct nand_chip *this = mtd_to_nand(mtd); void __iomem *io_base = this->priv; gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_NRE, 0); ndelay(40); writew(~0, io_base + OMAP_MPUIO_IO_CNTL); res = readw(this->IO_ADDR_R); gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_NRE, 1); return res; } static void ams_delta_write_buf(struct mtd_info *mtd, const u_char *buf, int len) { int i; for (i=0; i bit 2 * NAND_CLE: bit 1 -> bit 7 * NAND_ALE: bit 2 -> bit 6 */ static void ams_delta_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl) { if (ctrl & NAND_CTRL_CHANGE) { gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_NCE, (ctrl & NAND_NCE) == 0); gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_CLE, (ctrl & NAND_CLE) != 0); gpio_set_value(AMS_DELTA_GPIO_PIN_NAND_ALE, (ctrl & NAND_ALE) != 0); } if (cmd != NAND_CMD_NONE) ams_delta_write_byte(mtd, cmd); } static int ams_delta_nand_ready(struct mtd_info *mtd) { return gpio_get_value(AMS_DELTA_GPIO_PIN_NAND_RB); } static const struct gpio _mandatory_gpio[] = { { .gpio = AMS_DELTA_GPIO_PIN_NAND_NCE, .flags = GPIOF_OUT_INIT_HIGH, .label = "nand_nce", }, { .gpio = AMS_DELTA_GPIO_PIN_NAND_NRE, .flags = GPIOF_OUT_INIT_HIGH, .label = "nand_nre", }, { .gpio = AMS_DELTA_GPIO_PIN_NAND_NWP, .flags = GPIOF_OUT_INIT_HIGH, .label = "nand_nwp", }, { .gpio = AMS_DELTA_GPIO_PIN_NAND_NWE, .flags = GPIOF_OUT_INIT_HIGH, .label = "nand_nwe", }, { .gpio = AMS_DELTA_GPIO_PIN_NAND_ALE, .flags = GPIOF_OUT_INIT_LOW, .label = "nand_ale", }, { .gpio = AMS_DELTA_GPIO_PIN_NAND_CLE, .flags = GPIOF_OUT_INIT_LOW, .label = "nand_cle", }, }; /* * Main initialization routine */ static int ams_delta_init(struct platform_device *pdev) { struct nand_chip *this; struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); void __iomem *io_base; int err = 0; if (!res) return -ENXIO; /* Allocate memory for MTD device structure and private data */ this = kzalloc(sizeof(struct nand_chip), GFP_KERNEL); if (!this) { printk (KERN_WARNING "Unable to allocate E3 NAND MTD device structure.\n"); err = -ENOMEM; goto out; } ams_delta_mtd = nand_to_mtd(this); ams_delta_mtd->owner = THIS_MODULE; /* Link the private data with the MTD structure */ ams_delta_mtd->priv = this; /* * Don't try to request the memory region from here, * it should have been already requested from the * gpio-omap driver and requesting it again would fail. */ io_base = ioremap(res->start, resource_size(res)); if (io_base == NULL) { dev_err(&pdev->dev, "ioremap failed\n"); err = -EIO; goto out_free; } this->priv = io_base; /* Set address of NAND IO lines */ this->IO_ADDR_R = io_base + OMAP_MPUIO_INPUT_LATCH; this->IO_ADDR_W = io_base + OMAP_MPUIO_OUTPUT; this->read_byte = ams_delta_read_byte; this->write_buf = ams_delta_write_buf; this->read_buf = ams_delta_read_buf; this->cmd_ctrl = ams_delta_hwcontrol; if (gpio_request(AMS_DELTA_GPIO_PIN_NAND_RB, "nand_rdy") == 0) { this->dev_ready = ams_delta_nand_ready; } else { this->dev_ready = NULL; printk(KERN_NOTICE "Couldn't request gpio for Delta NAND ready.\n"); } /* 25 us command delay time */ this->chip_delay = 30; this->ecc.mode = NAND_ECC_SOFT; platform_set_drvdata(pdev, io_base); /* Set chip enabled, but */ err = gpio_request_array(_mandatory_gpio, ARRAY_SIZE(_mandatory_gpio)); if (err) goto out_gpio; /* Scan to find existence of the device */ if (nand_scan(ams_delta_mtd, 1)) { err = -ENXIO; goto out_mtd; } /* Register the partitions */ mtd_device_register(ams_delta_mtd, partition_info, ARRAY_SIZE(partition_info)); goto out; out_mtd: gpio_free_array(_mandatory_gpio, ARRAY_SIZE(_mandatory_gpio)); out_gpio: gpio_free(AMS_DELTA_GPIO_PIN_NAND_RB); iounmap(io_base); out_free: kfree(this); out: return err; } /* * Clean up routine */ static int ams_delta_cleanup(struct platform_device *pdev) { void __iomem *io_base = platform_get_drvdata(pdev); /* Release resources, unregister device */ nand_release(ams_delta_mtd); gpio_free_array(_mandatory_gpio, ARRAY_SIZE(_mandatory_gpio)); gpio_free(AMS_DELTA_GPIO_PIN_NAND_RB); iounmap(io_base); /* Free the MTD device structure */ kfree(mtd_to_nand(ams_delta_mtd)); return 0; } static struct platform_driver ams_delta_nand_driver = { .probe = ams_delta_init, .remove = ams_delta_cleanup, .driver = { .name = "ams-delta-nand", }, }; module_platform_driver(ams_delta_nand_driver); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Jonathan McDowell "); MODULE_DESCRIPTION("Glue layer for NAND flash on Amstrad E3 (Delta)");