--- /dev/null
+/*
+ * Freescale UPM NAND driver.
+ *
+ * Copyright © 2007-2008 MontaVista Software, Inc.
+ *
+ * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/nand_ecc.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/mtd.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <asm/fsl_lbc.h>
+
+#define FSL_UPM_WAIT_RUN_PATTERN 0x1
+#define FSL_UPM_WAIT_WRITE_BYTE 0x2
+#define FSL_UPM_WAIT_WRITE_BUFFER 0x4
+
+struct fsl_upm_nand {
+ struct device *dev;
+ struct mtd_info mtd;
+ struct nand_chip chip;
+ int last_ctrl;
+ struct mtd_partition *parts;
+ struct fsl_upm upm;
+ uint8_t upm_addr_offset;
+ uint8_t upm_cmd_offset;
+ void __iomem *io_base;
+ int rnb_gpio[NAND_MAX_CHIPS];
+ uint32_t mchip_offsets[NAND_MAX_CHIPS];
+ uint32_t mchip_count;
+ uint32_t mchip_number;
+ int chip_delay;
+ uint32_t wait_flags;
+};
+
+static inline struct fsl_upm_nand *to_fsl_upm_nand(struct mtd_info *mtdinfo)
+{
+ return container_of(mtdinfo, struct fsl_upm_nand, mtd);
+}
+
+static int fun_chip_ready(struct mtd_info *mtd)
+{
+ struct fsl_upm_nand *fun = to_fsl_upm_nand(mtd);
+
+ if (gpio_get_value(fun->rnb_gpio[fun->mchip_number]))
+ return 1;
+
+ dev_vdbg(fun->dev, "busy\n");
+ return 0;
+}
+
+static void fun_wait_rnb(struct fsl_upm_nand *fun)
+{
+ if (fun->rnb_gpio[fun->mchip_number] >= 0) {
+ int cnt = 1000000;
+
+ while (--cnt && !fun_chip_ready(&fun->mtd))
+ cpu_relax();
+ if (!cnt)
+ dev_err(fun->dev, "tired waiting for RNB\n");
+ } else {
+ ndelay(100);
+ }
+}
+
+static void fun_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
+{
+ struct nand_chip *chip = mtd->priv;
+ struct fsl_upm_nand *fun = to_fsl_upm_nand(mtd);
+ u32 mar;
+
+ if (!(ctrl & fun->last_ctrl)) {
+ fsl_upm_end_pattern(&fun->upm);
+
+ if (cmd == NAND_CMD_NONE)
+ return;
+
+ fun->last_ctrl = ctrl & (NAND_ALE | NAND_CLE);
+ }
+
+ if (ctrl & NAND_CTRL_CHANGE) {
+ if (ctrl & NAND_ALE)
+ fsl_upm_start_pattern(&fun->upm, fun->upm_addr_offset);
+ else if (ctrl & NAND_CLE)
+ fsl_upm_start_pattern(&fun->upm, fun->upm_cmd_offset);
+ }
+
+ mar = (cmd << (32 - fun->upm.width)) |
+ fun->mchip_offsets[fun->mchip_number];
+ fsl_upm_run_pattern(&fun->upm, chip->IO_ADDR_R, mar);
+
+ if (fun->wait_flags & FSL_UPM_WAIT_RUN_PATTERN)
+ fun_wait_rnb(fun);
+}
+
+static void fun_select_chip(struct mtd_info *mtd, int mchip_nr)
+{
+ struct nand_chip *chip = mtd->priv;
+ struct fsl_upm_nand *fun = to_fsl_upm_nand(mtd);
+
+ if (mchip_nr == -1) {
+ chip->cmd_ctrl(mtd, NAND_CMD_NONE, 0 | NAND_CTRL_CHANGE);
+ } else if (mchip_nr >= 0 && mchip_nr < NAND_MAX_CHIPS) {
+ fun->mchip_number = mchip_nr;
+ chip->IO_ADDR_R = fun->io_base + fun->mchip_offsets[mchip_nr];
+ chip->IO_ADDR_W = chip->IO_ADDR_R;
+ } else {
+ BUG();
+ }
+}
+
+static uint8_t fun_read_byte(struct mtd_info *mtd)
+{
+ struct fsl_upm_nand *fun = to_fsl_upm_nand(mtd);
+
+ return in_8(fun->chip.IO_ADDR_R);
+}
+
+static void fun_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
+{
+ struct fsl_upm_nand *fun = to_fsl_upm_nand(mtd);
+ int i;
+
+ for (i = 0; i < len; i++)
+ buf[i] = in_8(fun->chip.IO_ADDR_R);
+}
+
+static void fun_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
+{
+ struct fsl_upm_nand *fun = to_fsl_upm_nand(mtd);
+ int i;
+
+ for (i = 0; i < len; i++) {
+ out_8(fun->chip.IO_ADDR_W, buf[i]);
+ if (fun->wait_flags & FSL_UPM_WAIT_WRITE_BYTE)
+ fun_wait_rnb(fun);
+ }
+ if (fun->wait_flags & FSL_UPM_WAIT_WRITE_BUFFER)
+ fun_wait_rnb(fun);
+}
+
+static int fun_chip_init(struct fsl_upm_nand *fun,
+ const struct device_node *upm_np,
+ const struct resource *io_res)
+{
+ int ret;
+ struct device_node *flash_np;
+ struct mtd_part_parser_data ppdata;
+
+ fun->chip.IO_ADDR_R = fun->io_base;
+ fun->chip.IO_ADDR_W = fun->io_base;
+ fun->chip.cmd_ctrl = fun_cmd_ctrl;
+ fun->chip.chip_delay = fun->chip_delay;
+ fun->chip.read_byte = fun_read_byte;
+ fun->chip.read_buf = fun_read_buf;
+ fun->chip.write_buf = fun_write_buf;
+ fun->chip.ecc.mode = NAND_ECC_SOFT;
+ if (fun->mchip_count > 1)
+ fun->chip.select_chip = fun_select_chip;
+
+ if (fun->rnb_gpio[0] >= 0)
+ fun->chip.dev_ready = fun_chip_ready;
+
+ fun->mtd.priv = &fun->chip;
+ fun->mtd.owner = THIS_MODULE;
+
+ flash_np = of_get_next_child(upm_np, NULL);
+ if (!flash_np)
+ return -ENODEV;
+
+ fun->mtd.name = kasprintf(GFP_KERNEL, "0x%llx.%s", (u64)io_res->start,
+ flash_np->name);
+ if (!fun->mtd.name) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ ret = nand_scan(&fun->mtd, fun->mchip_count);
+ if (ret)
+ goto err;
+
+ ppdata.of_node = flash_np;
+ ret = mtd_device_parse_register(&fun->mtd, NULL, &ppdata, NULL, 0);
+err:
+ of_node_put(flash_np);
+ if (ret)
+ kfree(fun->mtd.name);
+ return ret;
+}
+
+static int fun_probe(struct platform_device *ofdev)
+{
+ struct fsl_upm_nand *fun;
+ struct resource io_res;
+ const __be32 *prop;
+ int rnb_gpio;
+ int ret;
+ int size;
+ int i;
+
+ fun = kzalloc(sizeof(*fun), GFP_KERNEL);
+ if (!fun)
+ return -ENOMEM;
+
+ ret = of_address_to_resource(ofdev->dev.of_node, 0, &io_res);
+ if (ret) {
+ dev_err(&ofdev->dev, "can't get IO base\n");
+ goto err1;
+ }
+
+ ret = fsl_upm_find(io_res.start, &fun->upm);
+ if (ret) {
+ dev_err(&ofdev->dev, "can't find UPM\n");
+ goto err1;
+ }
+
+ prop = of_get_property(ofdev->dev.of_node, "fsl,upm-addr-offset",
+ &size);
+ if (!prop || size != sizeof(uint32_t)) {
+ dev_err(&ofdev->dev, "can't get UPM address offset\n");
+ ret = -EINVAL;
+ goto err1;
+ }
+ fun->upm_addr_offset = *prop;
+
+ prop = of_get_property(ofdev->dev.of_node, "fsl,upm-cmd-offset", &size);
+ if (!prop || size != sizeof(uint32_t)) {
+ dev_err(&ofdev->dev, "can't get UPM command offset\n");
+ ret = -EINVAL;
+ goto err1;
+ }
+ fun->upm_cmd_offset = *prop;
+
+ prop = of_get_property(ofdev->dev.of_node,
+ "fsl,upm-addr-line-cs-offsets", &size);
+ if (prop && (size / sizeof(uint32_t)) > 0) {
+ fun->mchip_count = size / sizeof(uint32_t);
+ if (fun->mchip_count >= NAND_MAX_CHIPS) {
+ dev_err(&ofdev->dev, "too much multiple chips\n");
+ goto err1;
+ }
+ for (i = 0; i < fun->mchip_count; i++)
+ fun->mchip_offsets[i] = be32_to_cpu(prop[i]);
+ } else {
+ fun->mchip_count = 1;
+ }
+
+ for (i = 0; i < fun->mchip_count; i++) {
+ fun->rnb_gpio[i] = -1;
+ rnb_gpio = of_get_gpio(ofdev->dev.of_node, i);
+ if (rnb_gpio >= 0) {
+ ret = gpio_request(rnb_gpio, dev_name(&ofdev->dev));
+ if (ret) {
+ dev_err(&ofdev->dev,
+ "can't request RNB gpio #%d\n", i);
+ goto err2;
+ }
+ gpio_direction_input(rnb_gpio);
+ fun->rnb_gpio[i] = rnb_gpio;
+ } else if (rnb_gpio == -EINVAL) {
+ dev_err(&ofdev->dev, "RNB gpio #%d is invalid\n", i);
+ goto err2;
+ }
+ }
+
+ prop = of_get_property(ofdev->dev.of_node, "chip-delay", NULL);
+ if (prop)
+ fun->chip_delay = be32_to_cpup(prop);
+ else
+ fun->chip_delay = 50;
+
+ prop = of_get_property(ofdev->dev.of_node, "fsl,upm-wait-flags", &size);
+ if (prop && size == sizeof(uint32_t))
+ fun->wait_flags = be32_to_cpup(prop);
+ else
+ fun->wait_flags = FSL_UPM_WAIT_RUN_PATTERN |
+ FSL_UPM_WAIT_WRITE_BYTE;
+
+ fun->io_base = devm_ioremap_nocache(&ofdev->dev, io_res.start,
+ resource_size(&io_res));
+ if (!fun->io_base) {
+ ret = -ENOMEM;
+ goto err2;
+ }
+
+ fun->dev = &ofdev->dev;
+ fun->last_ctrl = NAND_CLE;
+
+ ret = fun_chip_init(fun, ofdev->dev.of_node, &io_res);
+ if (ret)
+ goto err2;
+
+ dev_set_drvdata(&ofdev->dev, fun);
+
+ return 0;
+err2:
+ for (i = 0; i < fun->mchip_count; i++) {
+ if (fun->rnb_gpio[i] < 0)
+ break;
+ gpio_free(fun->rnb_gpio[i]);
+ }
+err1:
+ kfree(fun);
+
+ return ret;
+}
+
+static int fun_remove(struct platform_device *ofdev)
+{
+ struct fsl_upm_nand *fun = dev_get_drvdata(&ofdev->dev);
+ int i;
+
+ nand_release(&fun->mtd);
+ kfree(fun->mtd.name);
+
+ for (i = 0; i < fun->mchip_count; i++) {
+ if (fun->rnb_gpio[i] < 0)
+ break;
+ gpio_free(fun->rnb_gpio[i]);
+ }
+
+ kfree(fun);
+
+ return 0;
+}
+
+static const struct of_device_id of_fun_match[] = {
+ { .compatible = "fsl,upm-nand" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, of_fun_match);
+
+static struct platform_driver of_fun_driver = {
+ .driver = {
+ .name = "fsl,upm-nand",
+ .of_match_table = of_fun_match,
+ },
+ .probe = fun_probe,
+ .remove = fun_remove,
+};
+
+module_platform_driver(of_fun_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
+MODULE_DESCRIPTION("Driver for NAND chips working through Freescale "
+ "LocalBus User-Programmable Machine");
Code Review / kvmfornfv.git / blobdiff