1 // SPDX-License-Identifier: GPL-2.0-only
15 #include <asm/mach-au1x00/au1000.h>
16 #include <asm/mach-au1x00/au1550nd.h>
33  * au_write_buf -  write buffer to chip
34  * @this:	NAND chip object
48 		writeb(p[i], ctx->base + MEM_STNAND_DATA);  in au_write_buf()
54  * au_read_buf -  read chip data into buffer
55  * @this:	NAND chip object
69 		p[i] = readb(ctx->base + MEM_STNAND_DATA);  in au_read_buf()
75  * au_write_buf16 -  write buffer to chip
76  * @this:	NAND chip object
91 		writew(p[i], ctx->base + MEM_STNAND_DATA);  in au_write_buf16()
97  * au_read_buf16 -  read chip data into buffer
98  * @this:	NAND chip object
112 		p[i] = readw(ctx->base + MEM_STNAND_DATA);  in au_read_buf16()
130 		end = (start | (start - 1)) & ~(start ^ mask);  in find_nand_cs()
135 	return -ENODEV;  in find_nand_cs()
150 	return -ETIMEDOUT;  in au1550nd_waitrdy()
160 	switch (instr->type) {  in au1550nd_exec_instr()
162 		writeb(instr->ctx.cmd.opcode,  in au1550nd_exec_instr()
163 		       ctx->base + MEM_STNAND_CMD);  in au1550nd_exec_instr()
169 		for (i = 0; i < instr->ctx.addr.naddrs; i++) {  in au1550nd_exec_instr()
170 			writeb(instr->ctx.addr.addrs[i],  in au1550nd_exec_instr()
171 			       ctx->base + MEM_STNAND_ADDR);  in au1550nd_exec_instr()
178 		if ((this->options & NAND_BUSWIDTH_16) &&  in au1550nd_exec_instr()
179 		    !instr->ctx.data.force_8bit)  in au1550nd_exec_instr()
180 			au_read_buf16(this, instr->ctx.data.buf.in,  in au1550nd_exec_instr()
181 				      instr->ctx.data.len);  in au1550nd_exec_instr()
183 			au_read_buf(this, instr->ctx.data.buf.in,  in au1550nd_exec_instr()
184 				    instr->ctx.data.len);  in au1550nd_exec_instr()
188 		if ((this->options & NAND_BUSWIDTH_16) &&  in au1550nd_exec_instr()
189 		    !instr->ctx.data.force_8bit)  in au1550nd_exec_instr()
190 			au_write_buf16(this, instr->ctx.data.buf.out,  in au1550nd_exec_instr()
191 				       instr->ctx.data.len);  in au1550nd_exec_instr()
193 			au_write_buf(this, instr->ctx.data.buf.out,  in au1550nd_exec_instr()
194 				     instr->ctx.data.len);  in au1550nd_exec_instr()
198 		ret = au1550nd_waitrdy(this, instr->ctx.waitrdy.timeout_ms);  in au1550nd_exec_instr()
201 		return -EINVAL;  in au1550nd_exec_instr()
204 	if (instr->delay_ns)  in au1550nd_exec_instr()
205 		ndelay(instr->delay_ns);  in au1550nd_exec_instr()
222 	alchemy_wrsmem((1 << (4 + ctx->cs)), AU1000_MEM_STNDCTL);  in au1550nd_exec_op()
226 	for (i = 0; i < op->ninstrs; i++) {  in au1550nd_exec_op()
227 		ret = au1550nd_exec_instr(this, &op->instrs[i]);  in au1550nd_exec_op()
242 	if (chip->ecc.engine_type == NAND_ECC_ENGINE_TYPE_SOFT &&  in au1550nd_attach_chip()
243 	    chip->ecc.algo == NAND_ECC_ALGO_UNKNOWN)  in au1550nd_attach_chip()
244 		chip->ecc.algo = NAND_ECC_ALGO_HAMMING;  in au1550nd_attach_chip()
263 	pd = dev_get_platdata(&pdev->dev);  in au1550nd_probe()
265 		dev_err(&pdev->dev, "missing platform data\n");  in au1550nd_probe()
266 		return -ENODEV;  in au1550nd_probe()
271 		return -ENOMEM;  in au1550nd_probe()
275 		dev_err(&pdev->dev, "no NAND memory resource\n");  in au1550nd_probe()
276 		ret = -ENODEV;  in au1550nd_probe()
279 	if (request_mem_region(r->start, resource_size(r), "au1550-nand")) {  in au1550nd_probe()
280 		dev_err(&pdev->dev, "cannot claim NAND memory area\n");  in au1550nd_probe()
281 		ret = -ENOMEM;  in au1550nd_probe()
285 	ctx->base = ioremap(r->start, 0x1000);  in au1550nd_probe()
286 	if (!ctx->base) {  in au1550nd_probe()
287 		dev_err(&pdev->dev, "cannot remap NAND memory area\n");  in au1550nd_probe()
288 		ret = -ENODEV;  in au1550nd_probe()
292 	this = &ctx->chip;  in au1550nd_probe()
294 	mtd->dev.parent = &pdev->dev;  in au1550nd_probe()
296 	/* figure out which CS# r->start belongs to */  in au1550nd_probe()
297 	cs = find_nand_cs(r->start);  in au1550nd_probe()
299 		dev_err(&pdev->dev, "cannot detect NAND chipselect\n");  in au1550nd_probe()
300 		ret = -ENODEV;  in au1550nd_probe()
303 	ctx->cs = cs;  in au1550nd_probe()
305 	nand_controller_init(&ctx->controller);  in au1550nd_probe()
306 	ctx->controller.ops = &au1550nd_ops;  in au1550nd_probe()
307 	this->controller = &ctx->controller;  in au1550nd_probe()
309 	if (pd->devwidth)  in au1550nd_probe()
310 		this->options |= NAND_BUSWIDTH_16;  in au1550nd_probe()
313 	 * This driver assumes that the default ECC engine should be TYPE_SOFT.  in au1550nd_probe()
314 	 * Set ->engine_type before registering the NAND devices in order to  in au1550nd_probe()
317 	this->ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT;  in au1550nd_probe()
321 		dev_err(&pdev->dev, "NAND scan failed with %d\n", ret);  in au1550nd_probe()
325 	mtd_device_register(mtd, pd->parts, pd->num_parts);  in au1550nd_probe()
332 	iounmap(ctx->base);  in au1550nd_probe()
334 	release_mem_region(r->start, resource_size(r));  in au1550nd_probe()
344 	struct nand_chip *chip = &ctx->chip;  in au1550nd_remove()
350 	iounmap(ctx->base);  in au1550nd_remove()
351 	release_mem_region(r->start, 0x1000);  in au1550nd_remove()
358 		.name	= "au1550-nand",
368 MODULE_DESCRIPTION("Board-specific glue layer for NAND flash on Pb1550 board");