1 files changed, 291 insertions, 0 deletions

diff --git a/drivers/mtd/nand/fsl_upm.c b/drivers/mtd/nand/fsl_upm.c
new file mode 100644
index 00000000000..1ebfd87f00b
--- /dev/null
+++ b/drivers/mtd/nand/fsl_upm.c
@@ -0,0 +1,291 @@
+/*
+ * 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/mtd/nand.h>
+#include <linux/mtd/nand_ecc.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/mtd.h>
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
+#include <linux/io.h>
+#include <asm/fsl_lbc.h>
+
+struct fsl_upm_nand {
+        struct device *dev;
+        struct mtd_info mtd;
+        struct nand_chip chip;
+        int last_ctrl;
+#ifdef CONFIG_MTD_PARTITIONS
+        struct mtd_partition *parts;
+#endif
+
+        struct fsl_upm upm;
+        uint8_t upm_addr_offset;
+        uint8_t upm_cmd_offset;
+        void __iomem *io_base;
+        int rnb_gpio;
+        const uint32_t *wait_pattern;
+        const uint32_t *wait_write;
+        int chip_delay;
+};
+
+#define to_fsl_upm_nand(mtd) container_of(mtd, 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))
+                return 1;
+
+        dev_vdbg(fun->dev, "busy\n");
+        return 0;
+}
+
+static void fun_wait_rnb(struct fsl_upm_nand *fun)
+{
+        int cnt = 1000000;
+
+        if (fun->rnb_gpio >= 0) {
+                while (--cnt && !fun_chip_ready(&fun->mtd))
+                        cpu_relax();
+        }
+
+        if (!cnt)
+                dev_err(fun->dev, "tired waiting for RNB\n");
+}
+
+static void fun_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
+{
+        struct fsl_upm_nand *fun = to_fsl_upm_nand(mtd);
+
+        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);
+        }
+
+        fsl_upm_run_pattern(&fun->upm, fun->io_base, cmd);
+
+        if (fun->wait_pattern)
+                fun_wait_rnb(fun);
+}
+
+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_write)
+                        fun_wait_rnb(fun);
+        }
+}
+
+static int __devinit fun_chip_init(struct fsl_upm_nand *fun)
+{
+        int ret;
+#ifdef CONFIG_MTD_PARTITIONS
+        static const char *part_types[] = { "cmdlinepart", NULL, };
+#endif
+
+        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->rnb_gpio >= 0)
+                fun->chip.dev_ready = fun_chip_ready;
+
+        fun->mtd.priv = &fun->chip;
+        fun->mtd.owner = THIS_MODULE;
+
+        ret = nand_scan(&fun->mtd, 1);
+        if (ret)
+                return ret;
+
+        fun->mtd.name = fun->dev->bus_id;
+
+#ifdef CONFIG_MTD_PARTITIONS
+        ret = parse_mtd_partitions(&fun->mtd, part_types, &fun->parts, 0);
+        if (ret > 0)
+                return add_mtd_partitions(&fun->mtd, fun->parts, ret);
+#endif
+        return add_mtd_device(&fun->mtd);
+}
+
+static int __devinit fun_probe(struct of_device *ofdev,
+                               const struct of_device_id *ofid)
+{
+        struct fsl_upm_nand *fun;
+        struct resource io_res;
+        const uint32_t *prop;
+        int ret;
+        int size;
+
+        fun = kzalloc(sizeof(*fun), GFP_KERNEL);
+        if (!fun)
+                return -ENOMEM;
+
+        ret = of_address_to_resource(ofdev->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->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 err2;
+        }
+        fun->upm_addr_offset = *prop;
+
+        prop = of_get_property(ofdev->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 err2;
+        }
+        fun->upm_cmd_offset = *prop;
+
+        fun->rnb_gpio = of_get_gpio(ofdev->node, 0);
+        if (fun->rnb_gpio >= 0) {
+                ret = gpio_request(fun->rnb_gpio, ofdev->dev.bus_id);
+                if (ret) {
+                        dev_err(&ofdev->dev, "can't request RNB gpio\n");
+                        goto err2;
+                }
+                gpio_direction_input(fun->rnb_gpio);
+        } else if (fun->rnb_gpio == -EINVAL) {
+                dev_err(&ofdev->dev, "specified RNB gpio is invalid\n");
+                goto err2;
+        }
+
+        fun->io_base = devm_ioremap_nocache(&ofdev->dev, io_res.start,
+                                          io_res.end - io_res.start + 1);
+        if (!fun->io_base) {
+                ret = -ENOMEM;
+                goto err2;
+        }
+
+        fun->dev = &ofdev->dev;
+        fun->last_ctrl = NAND_CLE;
+        fun->wait_pattern = of_get_property(ofdev->node, "fsl,wait-pattern",
+                                            NULL);
+        fun->wait_write = of_get_property(ofdev->node, "fsl,wait-write", NULL);
+
+        prop = of_get_property(ofdev->node, "chip-delay", NULL);
+        if (prop)
+                fun->chip_delay = *prop;
+        else
+                fun->chip_delay = 50;
+
+        ret = fun_chip_init(fun);
+        if (ret)
+                goto err2;
+
+        dev_set_drvdata(&ofdev->dev, fun);
+
+        return 0;
+err2:
+        if (fun->rnb_gpio >= 0)
+                gpio_free(fun->rnb_gpio);
+err1:
+        kfree(fun);
+
+        return ret;
+}
+
+static int __devexit fun_remove(struct of_device *ofdev)
+{
+        struct fsl_upm_nand *fun = dev_get_drvdata(&ofdev->dev);
+
+        nand_release(&fun->mtd);
+
+        if (fun->rnb_gpio >= 0)
+                gpio_free(fun->rnb_gpio);
+
+        kfree(fun);
+
+        return 0;
+}
+
+static struct of_device_id of_fun_match[] = {
+        { .compatible = "fsl,upm-nand" },
+        {},
+};
+MODULE_DEVICE_TABLE(of, of_fun_match);
+
+static struct of_platform_driver of_fun_driver = {
+        .name           = "fsl,upm-nand",
+        .match_table    = of_fun_match,
+        .probe          = fun_probe,
+        .remove         = __devexit_p(fun_remove),
+};
+
+static int __init fun_module_init(void)
+{
+        return of_register_platform_driver(&of_fun_driver);
+}
+module_init(fun_module_init);
+
+static void __exit fun_module_exit(void)
+{
+        of_unregister_platform_driver(&of_fun_driver);
+}
+module_exit(fun_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
+MODULE_DESCRIPTION("Driver for NAND chips working through Freescale "
+                   "LocalBus User-Programmable Machine");