1 // SPDX-License-Identifier: GPL-2.0-only
14 MODULE_DESCRIPTION("Serial flash driver for BCMA bus");
26 	b47s->cc_write(b47s, BCMA_CC_FLASHCTL, BCMA_CC_FLASHCTL_START | opcode);  in bcm47xxsflash_cmd()
28 		if (!(b47s->cc_read(b47s, BCMA_CC_FLASHCTL) &  in bcm47xxsflash_cmd()
33 	pr_err("Control command failed (timeout)!\n");  in bcm47xxsflash_cmd()
36 static int bcm47xxsflash_poll(struct bcm47xxsflash *b47s, int timeout)  in bcm47xxsflash_poll()  argument
38 	unsigned long deadline = jiffies + timeout;  in bcm47xxsflash_poll()
41 		switch (b47s->type) {  in bcm47xxsflash_poll()
44 			if (!(b47s->cc_read(b47s, BCMA_CC_FLASHDATA) &  in bcm47xxsflash_poll()
50 			if (b47s->cc_read(b47s, BCMA_CC_FLASHDATA) &  in bcm47xxsflash_poll()
60 	pr_err("Timeout waiting for flash to be ready!\n");  in bcm47xxsflash_poll()
62 	return -EBUSY;  in bcm47xxsflash_poll()
71 	struct bcm47xxsflash *b47s = mtd->priv;  in bcm47xxsflash_erase()
73 	switch (b47s->type) {  in bcm47xxsflash_erase()
76 		b47s->cc_write(b47s, BCMA_CC_FLASHADDR, erase->addr);  in bcm47xxsflash_erase()
77 		/* Newer flashes have "sub-sectors" which can be erased  in bcm47xxsflash_erase()
81 		if (b47s->blocksize < (64 * 1024))  in bcm47xxsflash_erase()
87 		b47s->cc_write(b47s, BCMA_CC_FLASHADDR, erase->addr << 1);  in bcm47xxsflash_erase()
98 	struct bcm47xxsflash *b47s = mtd->priv;  in bcm47xxsflash_read()
102 	if ((from + len) > mtd->size)  in bcm47xxsflash_read()
103 		return -EINVAL;  in bcm47xxsflash_read()
109 		memcpy_len = min(len, (size_t)(BCM47XXSFLASH_WINDOW_SZ - from));  in bcm47xxsflash_read()
110 		memcpy_fromio(buf, b47s->window + from, memcpy_len);  in bcm47xxsflash_read()
112 		len -= memcpy_len;  in bcm47xxsflash_read()
117 	for (; len; len--) {  in bcm47xxsflash_read()
118 		b47s->cc_write(b47s, BCMA_CC_FLASHADDR, from++);  in bcm47xxsflash_read()
120 		*buf++ = b47s->cc_read(b47s, BCMA_CC_FLASHDATA);  in bcm47xxsflash_read()
131 	struct bcm47xxsflash *b47s = mtd->priv;  in bcm47xxsflash_write_st()
138 	b47s->cc_write(b47s, BCMA_CC_FLASHADDR, offset);  in bcm47xxsflash_write_st()
139 	b47s->cc_write(b47s, BCMA_CC_FLASHDATA, *buf++);  in bcm47xxsflash_write_st()
142 	if (b47s->bcma_cc->core->id.rev < 20) {  in bcm47xxsflash_write_st()
150 	len--;  in bcm47xxsflash_write_st()
160 		len--;  in bcm47xxsflash_write_st()
165 	b47s->cc_write(b47s, BCMA_CC_FLASHCTL, 0);  in bcm47xxsflash_write_st()
168 		pr_err("Flash rejected dropping CSA\n");  in bcm47xxsflash_write_st()
176 	struct bcm47xxsflash *b47s = mtd->priv;  in bcm47xxsflash_write_at()
177 	u32 mask = b47s->blocksize - 1;  in bcm47xxsflash_write_at()
183 	if (byte || (len < b47s->blocksize)) {  in bcm47xxsflash_write_at()
186 		b47s->cc_write(b47s, BCMA_CC_FLASHADDR, page);  in bcm47xxsflash_write_at()
188 		/* 250 us for AT45DB321B */  in bcm47xxsflash_write_at()
191 			pr_err("Timeout reading page 0x%X info buffer\n", page);  in bcm47xxsflash_write_at()
199 		if (byte == b47s->blocksize)  in bcm47xxsflash_write_at()
202 		b47s->cc_write(b47s, BCMA_CC_FLASHADDR, byte++);  in bcm47xxsflash_write_at()
203 		b47s->cc_write(b47s, BCMA_CC_FLASHDATA, *buf++);  in bcm47xxsflash_write_at()
205 		len--;  in bcm47xxsflash_write_at()
210 	b47s->cc_write(b47s, BCMA_CC_FLASHADDR, page);  in bcm47xxsflash_write_at()
219 	struct bcm47xxsflash *b47s = mtd->priv;  in bcm47xxsflash_write()
226 		switch (b47s->type) {  in bcm47xxsflash_write()
241 		len -= written;  in bcm47xxsflash_write()
252 	struct mtd_info *mtd = &b47s->mtd;  in bcm47xxsflash_fill_mtd()
254 	mtd->priv = b47s;  in bcm47xxsflash_fill_mtd()
255 	mtd->dev.parent = dev;  in bcm47xxsflash_fill_mtd()
256 	mtd->name = "bcm47xxsflash";  in bcm47xxsflash_fill_mtd()
258 	mtd->type = MTD_NORFLASH;  in bcm47xxsflash_fill_mtd()
259 	mtd->flags = MTD_CAP_NORFLASH;  in bcm47xxsflash_fill_mtd()
260 	mtd->size = b47s->size;  in bcm47xxsflash_fill_mtd()
261 	mtd->erasesize = b47s->blocksize;  in bcm47xxsflash_fill_mtd()
262 	mtd->writesize = 1;  in bcm47xxsflash_fill_mtd()
263 	mtd->writebufsize = 1;  in bcm47xxsflash_fill_mtd()
265 	mtd->_erase = bcm47xxsflash_erase;  in bcm47xxsflash_fill_mtd()
266 	mtd->_read = bcm47xxsflash_read;  in bcm47xxsflash_fill_mtd()
267 	mtd->_write = bcm47xxsflash_write;  in bcm47xxsflash_fill_mtd()
276 	return bcma_cc_read32(b47s->bcma_cc, offset);  in bcm47xxsflash_bcma_cc_read()
282 	bcma_cc_write32(b47s->bcma_cc, offset, value);  in bcm47xxsflash_bcma_cc_write()
287 	struct device *dev = &pdev->dev;  in bcm47xxsflash_bcma_probe()
295 		return -ENOMEM;  in bcm47xxsflash_bcma_probe()
300 		return -EINVAL;  in bcm47xxsflash_bcma_probe()
302 	if (!devm_request_mem_region(dev, res->start, resource_size(res),  in bcm47xxsflash_bcma_probe()
303 				     res->name)) {  in bcm47xxsflash_bcma_probe()
305 		return -EBUSY;  in bcm47xxsflash_bcma_probe()
308 	b47s->bcma_cc = container_of(sflash, struct bcma_drv_cc, sflash);  in bcm47xxsflash_bcma_probe()
309 	b47s->cc_read = bcm47xxsflash_bcma_cc_read;  in bcm47xxsflash_bcma_probe()
310 	b47s->cc_write = bcm47xxsflash_bcma_cc_write;  in bcm47xxsflash_bcma_probe()
314 	 * allowing us to use cached access and gain some performance. Trying  in bcm47xxsflash_bcma_probe()
315 	 * the same on ARM based BCM53573 results in flash corruptions, we need  in bcm47xxsflash_bcma_probe()
322 	if (b47s->bcma_cc->core->id.rev == 54)  in bcm47xxsflash_bcma_probe()
323 		b47s->window = ioremap(res->start, resource_size(res));  in bcm47xxsflash_bcma_probe()
325 		b47s->window = ioremap_cache(res->start, resource_size(res));  in bcm47xxsflash_bcma_probe()
326 	if (!b47s->window) {  in bcm47xxsflash_bcma_probe()
328 		return -ENOMEM;  in bcm47xxsflash_bcma_probe()
331 	switch (b47s->bcma_cc->capabilities & BCMA_CC_CAP_FLASHT) {  in bcm47xxsflash_bcma_probe()
333 		b47s->type = BCM47XXSFLASH_TYPE_ST;  in bcm47xxsflash_bcma_probe()
336 		b47s->type = BCM47XXSFLASH_TYPE_ATMEL;  in bcm47xxsflash_bcma_probe()
340 	b47s->blocksize = sflash->blocksize;  in bcm47xxsflash_bcma_probe()
341 	b47s->numblocks = sflash->numblocks;  in bcm47xxsflash_bcma_probe()
342 	b47s->size = sflash->size;  in bcm47xxsflash_bcma_probe()
343 	bcm47xxsflash_fill_mtd(b47s, &pdev->dev);  in bcm47xxsflash_bcma_probe()
347 	err = mtd_device_parse_register(&b47s->mtd, probes, NULL, NULL, 0);  in bcm47xxsflash_bcma_probe()
350 		iounmap(b47s->window);  in bcm47xxsflash_bcma_probe()
355 		pr_warn("Serial flash busy\n");  in bcm47xxsflash_bcma_probe()
364 	mtd_device_unregister(&b47s->mtd);  in bcm47xxsflash_bcma_remove()
365 	iounmap(b47s->window);  in bcm47xxsflash_bcma_remove()