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272 lines
6.5 KiB
272 lines
6.5 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Freescale UPM NAND driver. |
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* |
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* Copyright © 2007-2008 MontaVista Software, Inc. |
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* |
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* Author: Anton Vorontsov <[email protected]> |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/delay.h> |
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#include <linux/mtd/rawnand.h> |
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#include <linux/mtd/partitions.h> |
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#include <linux/mtd/mtd.h> |
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#include <linux/of_platform.h> |
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#include <linux/io.h> |
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#include <linux/slab.h> |
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#include <asm/fsl_lbc.h> |
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struct fsl_upm_nand { |
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struct nand_controller base; |
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struct device *dev; |
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struct nand_chip chip; |
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struct fsl_upm upm; |
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uint8_t upm_addr_offset; |
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uint8_t upm_cmd_offset; |
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void __iomem *io_base; |
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struct gpio_desc *rnb_gpio[NAND_MAX_CHIPS]; |
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uint32_t mchip_offsets[NAND_MAX_CHIPS]; |
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uint32_t mchip_count; |
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uint32_t mchip_number; |
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}; |
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static inline struct fsl_upm_nand *to_fsl_upm_nand(struct mtd_info *mtdinfo) |
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{ |
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return container_of(mtd_to_nand(mtdinfo), struct fsl_upm_nand, |
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chip); |
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} |
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static int fun_chip_init(struct fsl_upm_nand *fun, |
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const struct device_node *upm_np, |
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const struct resource *io_res) |
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{ |
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struct mtd_info *mtd = nand_to_mtd(&fun->chip); |
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int ret; |
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struct device_node *flash_np; |
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fun->chip.ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT; |
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fun->chip.ecc.algo = NAND_ECC_ALGO_HAMMING; |
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fun->chip.controller = &fun->base; |
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mtd->dev.parent = fun->dev; |
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flash_np = of_get_next_child(upm_np, NULL); |
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if (!flash_np) |
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return -ENODEV; |
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nand_set_flash_node(&fun->chip, flash_np); |
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mtd->name = devm_kasprintf(fun->dev, GFP_KERNEL, "0x%llx.%pOFn", |
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(u64)io_res->start, |
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flash_np); |
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if (!mtd->name) { |
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ret = -ENOMEM; |
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goto err; |
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} |
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ret = nand_scan(&fun->chip, fun->mchip_count); |
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if (ret) |
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goto err; |
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ret = mtd_device_register(mtd, NULL, 0); |
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err: |
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of_node_put(flash_np); |
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return ret; |
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} |
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static int func_exec_instr(struct nand_chip *chip, |
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const struct nand_op_instr *instr) |
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{ |
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struct fsl_upm_nand *fun = to_fsl_upm_nand(nand_to_mtd(chip)); |
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u32 mar, reg_offs = fun->mchip_offsets[fun->mchip_number]; |
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unsigned int i; |
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const u8 *out; |
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u8 *in; |
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switch (instr->type) { |
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case NAND_OP_CMD_INSTR: |
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fsl_upm_start_pattern(&fun->upm, fun->upm_cmd_offset); |
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mar = (instr->ctx.cmd.opcode << (32 - fun->upm.width)) | |
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reg_offs; |
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fsl_upm_run_pattern(&fun->upm, fun->io_base + reg_offs, mar); |
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fsl_upm_end_pattern(&fun->upm); |
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return 0; |
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case NAND_OP_ADDR_INSTR: |
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fsl_upm_start_pattern(&fun->upm, fun->upm_addr_offset); |
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for (i = 0; i < instr->ctx.addr.naddrs; i++) { |
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mar = (instr->ctx.addr.addrs[i] << (32 - fun->upm.width)) | |
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reg_offs; |
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fsl_upm_run_pattern(&fun->upm, fun->io_base + reg_offs, mar); |
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} |
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fsl_upm_end_pattern(&fun->upm); |
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return 0; |
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case NAND_OP_DATA_IN_INSTR: |
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in = instr->ctx.data.buf.in; |
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for (i = 0; i < instr->ctx.data.len; i++) |
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in[i] = in_8(fun->io_base + reg_offs); |
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return 0; |
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case NAND_OP_DATA_OUT_INSTR: |
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out = instr->ctx.data.buf.out; |
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for (i = 0; i < instr->ctx.data.len; i++) |
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out_8(fun->io_base + reg_offs, out[i]); |
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return 0; |
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case NAND_OP_WAITRDY_INSTR: |
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if (!fun->rnb_gpio[fun->mchip_number]) |
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return nand_soft_waitrdy(chip, instr->ctx.waitrdy.timeout_ms); |
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return nand_gpio_waitrdy(chip, fun->rnb_gpio[fun->mchip_number], |
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instr->ctx.waitrdy.timeout_ms); |
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default: |
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return -EINVAL; |
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} |
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return 0; |
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} |
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static int fun_exec_op(struct nand_chip *chip, const struct nand_operation *op, |
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bool check_only) |
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{ |
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struct fsl_upm_nand *fun = to_fsl_upm_nand(nand_to_mtd(chip)); |
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unsigned int i; |
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int ret; |
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if (op->cs > NAND_MAX_CHIPS) |
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return -EINVAL; |
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if (check_only) |
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return 0; |
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fun->mchip_number = op->cs; |
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for (i = 0; i < op->ninstrs; i++) { |
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ret = func_exec_instr(chip, &op->instrs[i]); |
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if (ret) |
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return ret; |
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if (op->instrs[i].delay_ns) |
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ndelay(op->instrs[i].delay_ns); |
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} |
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return 0; |
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} |
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static const struct nand_controller_ops fun_ops = { |
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.exec_op = fun_exec_op, |
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}; |
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static int fun_probe(struct platform_device *ofdev) |
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{ |
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struct fsl_upm_nand *fun; |
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struct resource *io_res; |
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const __be32 *prop; |
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int ret; |
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int size; |
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int i; |
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fun = devm_kzalloc(&ofdev->dev, sizeof(*fun), GFP_KERNEL); |
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if (!fun) |
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return -ENOMEM; |
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io_res = platform_get_resource(ofdev, IORESOURCE_MEM, 0); |
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fun->io_base = devm_ioremap_resource(&ofdev->dev, io_res); |
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if (IS_ERR(fun->io_base)) |
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return PTR_ERR(fun->io_base); |
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ret = fsl_upm_find(io_res->start, &fun->upm); |
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if (ret) { |
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dev_err(&ofdev->dev, "can't find UPM\n"); |
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return ret; |
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} |
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prop = of_get_property(ofdev->dev.of_node, "fsl,upm-addr-offset", |
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&size); |
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if (!prop || size != sizeof(uint32_t)) { |
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dev_err(&ofdev->dev, "can't get UPM address offset\n"); |
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return -EINVAL; |
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} |
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fun->upm_addr_offset = *prop; |
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prop = of_get_property(ofdev->dev.of_node, "fsl,upm-cmd-offset", &size); |
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if (!prop || size != sizeof(uint32_t)) { |
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dev_err(&ofdev->dev, "can't get UPM command offset\n"); |
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return -EINVAL; |
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} |
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fun->upm_cmd_offset = *prop; |
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prop = of_get_property(ofdev->dev.of_node, |
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"fsl,upm-addr-line-cs-offsets", &size); |
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if (prop && (size / sizeof(uint32_t)) > 0) { |
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fun->mchip_count = size / sizeof(uint32_t); |
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if (fun->mchip_count >= NAND_MAX_CHIPS) { |
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dev_err(&ofdev->dev, "too much multiple chips\n"); |
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return -EINVAL; |
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} |
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for (i = 0; i < fun->mchip_count; i++) |
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fun->mchip_offsets[i] = be32_to_cpu(prop[i]); |
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} else { |
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fun->mchip_count = 1; |
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} |
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for (i = 0; i < fun->mchip_count; i++) { |
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fun->rnb_gpio[i] = devm_gpiod_get_index_optional(&ofdev->dev, |
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NULL, i, |
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GPIOD_IN); |
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if (IS_ERR(fun->rnb_gpio[i])) { |
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dev_err(&ofdev->dev, "RNB gpio #%d is invalid\n", i); |
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return PTR_ERR(fun->rnb_gpio[i]); |
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} |
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} |
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nand_controller_init(&fun->base); |
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fun->base.ops = &fun_ops; |
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fun->dev = &ofdev->dev; |
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ret = fun_chip_init(fun, ofdev->dev.of_node, io_res); |
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if (ret) |
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return ret; |
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dev_set_drvdata(&ofdev->dev, fun); |
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return 0; |
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} |
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static int fun_remove(struct platform_device *ofdev) |
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{ |
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struct fsl_upm_nand *fun = dev_get_drvdata(&ofdev->dev); |
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struct nand_chip *chip = &fun->chip; |
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struct mtd_info *mtd = nand_to_mtd(chip); |
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int ret; |
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ret = mtd_device_unregister(mtd); |
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WARN_ON(ret); |
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nand_cleanup(chip); |
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return 0; |
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} |
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static const struct of_device_id of_fun_match[] = { |
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{ .compatible = "fsl,upm-nand" }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, of_fun_match); |
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static struct platform_driver of_fun_driver = { |
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.driver = { |
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.name = "fsl,upm-nand", |
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.of_match_table = of_fun_match, |
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}, |
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.probe = fun_probe, |
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.remove = fun_remove, |
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}; |
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module_platform_driver(of_fun_driver); |
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MODULE_LICENSE("GPL"); |
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MODULE_AUTHOR("Anton Vorontsov <[email protected]>"); |
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MODULE_DESCRIPTION("Driver for NAND chips working through Freescale " |
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"LocalBus User-Programmable Machine");
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