diff options
Diffstat (limited to 'drivers/mtd/nand/raw/fsl_upm.c')
| -rw-r--r-- | drivers/mtd/nand/raw/fsl_upm.c | 272 |
1 files changed, 272 insertions, 0 deletions
diff --git a/drivers/mtd/nand/raw/fsl_upm.c b/drivers/mtd/nand/raw/fsl_upm.c new file mode 100644 index 000000000..636e65328 --- /dev/null +++ b/drivers/mtd/nand/raw/fsl_upm.c @@ -0,0 +1,272 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Freescale UPM NAND driver. + * + * Copyright © 2007-2008 MontaVista Software, Inc. + * + * Author: Anton Vorontsov <avorontsov@ru.mvista.com> + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/mtd/rawnand.h> +#include <linux/mtd/partitions.h> +#include <linux/mtd/mtd.h> +#include <linux/of_platform.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <asm/fsl_lbc.h> + +struct fsl_upm_nand { + struct nand_controller base; + struct device *dev; + struct nand_chip chip; + struct fsl_upm upm; + uint8_t upm_addr_offset; + uint8_t upm_cmd_offset; + void __iomem *io_base; + struct gpio_desc *rnb_gpio[NAND_MAX_CHIPS]; + uint32_t mchip_offsets[NAND_MAX_CHIPS]; + uint32_t mchip_count; + uint32_t mchip_number; +}; + +static inline struct fsl_upm_nand *to_fsl_upm_nand(struct mtd_info *mtdinfo) +{ + return container_of(mtd_to_nand(mtdinfo), struct fsl_upm_nand, + chip); +} + +static int fun_chip_init(struct fsl_upm_nand *fun, + const struct device_node *upm_np, + const struct resource *io_res) +{ + struct mtd_info *mtd = nand_to_mtd(&fun->chip); + int ret; + struct device_node *flash_np; + + fun->chip.ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT; + fun->chip.ecc.algo = NAND_ECC_ALGO_HAMMING; + fun->chip.controller = &fun->base; + mtd->dev.parent = fun->dev; + + flash_np = of_get_next_child(upm_np, NULL); + if (!flash_np) + return -ENODEV; + + nand_set_flash_node(&fun->chip, flash_np); + mtd->name = devm_kasprintf(fun->dev, GFP_KERNEL, "0x%llx.%pOFn", + (u64)io_res->start, + flash_np); + if (!mtd->name) { + ret = -ENOMEM; + goto err; + } + + ret = nand_scan(&fun->chip, fun->mchip_count); + if (ret) + goto err; + + ret = mtd_device_register(mtd, NULL, 0); +err: + of_node_put(flash_np); + return ret; +} + +static int func_exec_instr(struct nand_chip *chip, + const struct nand_op_instr *instr) +{ + struct fsl_upm_nand *fun = to_fsl_upm_nand(nand_to_mtd(chip)); + u32 mar, reg_offs = fun->mchip_offsets[fun->mchip_number]; + unsigned int i; + const u8 *out; + u8 *in; + + switch (instr->type) { + case NAND_OP_CMD_INSTR: + fsl_upm_start_pattern(&fun->upm, fun->upm_cmd_offset); + mar = (instr->ctx.cmd.opcode << (32 - fun->upm.width)) | + reg_offs; + fsl_upm_run_pattern(&fun->upm, fun->io_base + reg_offs, mar); + fsl_upm_end_pattern(&fun->upm); + return 0; + + case NAND_OP_ADDR_INSTR: + fsl_upm_start_pattern(&fun->upm, fun->upm_addr_offset); + for (i = 0; i < instr->ctx.addr.naddrs; i++) { + mar = (instr->ctx.addr.addrs[i] << (32 - fun->upm.width)) | + reg_offs; + fsl_upm_run_pattern(&fun->upm, fun->io_base + reg_offs, mar); + } + fsl_upm_end_pattern(&fun->upm); + return 0; + + case NAND_OP_DATA_IN_INSTR: + in = instr->ctx.data.buf.in; + for (i = 0; i < instr->ctx.data.len; i++) + in[i] = in_8(fun->io_base + reg_offs); + return 0; + + case NAND_OP_DATA_OUT_INSTR: + out = instr->ctx.data.buf.out; + for (i = 0; i < instr->ctx.data.len; i++) + out_8(fun->io_base + reg_offs, out[i]); + return 0; + + case NAND_OP_WAITRDY_INSTR: + if (!fun->rnb_gpio[fun->mchip_number]) + return nand_soft_waitrdy(chip, instr->ctx.waitrdy.timeout_ms); + + return nand_gpio_waitrdy(chip, fun->rnb_gpio[fun->mchip_number], + instr->ctx.waitrdy.timeout_ms); + + default: + return -EINVAL; + } + + return 0; +} + +static int fun_exec_op(struct nand_chip *chip, const struct nand_operation *op, + bool check_only) +{ + struct fsl_upm_nand *fun = to_fsl_upm_nand(nand_to_mtd(chip)); + unsigned int i; + int ret; + + if (op->cs >= NAND_MAX_CHIPS) + return -EINVAL; + + if (check_only) + return 0; + + fun->mchip_number = op->cs; + + for (i = 0; i < op->ninstrs; i++) { + ret = func_exec_instr(chip, &op->instrs[i]); + if (ret) + return ret; + + if (op->instrs[i].delay_ns) + ndelay(op->instrs[i].delay_ns); + } + + return 0; +} + +static const struct nand_controller_ops fun_ops = { + .exec_op = fun_exec_op, +}; + +static int fun_probe(struct platform_device *ofdev) +{ + struct fsl_upm_nand *fun; + struct resource *io_res; + const __be32 *prop; + int ret; + int size; + int i; + + fun = devm_kzalloc(&ofdev->dev, sizeof(*fun), GFP_KERNEL); + if (!fun) + return -ENOMEM; + + io_res = platform_get_resource(ofdev, IORESOURCE_MEM, 0); + fun->io_base = devm_ioremap_resource(&ofdev->dev, io_res); + if (IS_ERR(fun->io_base)) + return PTR_ERR(fun->io_base); + + ret = fsl_upm_find(io_res->start, &fun->upm); + if (ret) { + dev_err(&ofdev->dev, "can't find UPM\n"); + return ret; + } + + 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"); + return -EINVAL; + } + 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"); + return -EINVAL; + } + 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"); + return -EINVAL; + } + 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] = devm_gpiod_get_index_optional(&ofdev->dev, + NULL, i, + GPIOD_IN); + if (IS_ERR(fun->rnb_gpio[i])) { + dev_err(&ofdev->dev, "RNB gpio #%d is invalid\n", i); + return PTR_ERR(fun->rnb_gpio[i]); + } + } + + nand_controller_init(&fun->base); + fun->base.ops = &fun_ops; + fun->dev = &ofdev->dev; + + ret = fun_chip_init(fun, ofdev->dev.of_node, io_res); + if (ret) + return ret; + + dev_set_drvdata(&ofdev->dev, fun); + + return 0; +} + +static int fun_remove(struct platform_device *ofdev) +{ + struct fsl_upm_nand *fun = dev_get_drvdata(&ofdev->dev); + struct nand_chip *chip = &fun->chip; + struct mtd_info *mtd = nand_to_mtd(chip); + int ret; + + ret = mtd_device_unregister(mtd); + WARN_ON(ret); + nand_cleanup(chip); + + 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"); |