1 // SPDX-License-Identifier: GPL-2.0-only
4  * MTD driver for the 28F160F3 Flash Memory (non-CFI) on LART.
13  *           - Order Number: 290644-005
14  *           - January 2000
17  *           - http://www.linux-mtd.infradead.org/ 
70 #define BUSWIDTH			4				/* don't change this - a lot of the code _will_ break if you change this */
71 #define FLASH_OFFSET		0xe8000000		/* see linux/arch/arm/mach-sa1100/lart.c */
117  *   	 -------------------
136 /* Mangle data (x) */
137 #define DATA_TO_FLASH(x)				\  argument
139 		(((x) & 0x08009000) >> 11)	+	\
140 		(((x) & 0x00002000) >> 10)	+	\
141 		(((x) & 0x04004000) >> 8)	+	\
142 		(((x) & 0x00000010) >> 4)	+	\
143 		(((x) & 0x91000820) >> 3)	+	\
144 		(((x) & 0x22080080) >> 2)	+	\
145 		((x) & 0x40000400)			+	\
146 		(((x) & 0x00040040) << 1)	+	\
147 		(((x) & 0x00110000) << 4)	+	\
148 		(((x) & 0x00220100) << 5)	+	\
149 		(((x) & 0x00800208) << 6)	+	\
150 		(((x) & 0x00400004) << 9)	+	\
151 		(((x) & 0x00000001) << 12)	+	\
152 		(((x) & 0x00000002) << 13)		\
155 /* Unmangle data (x) */
156 #define FLASH_TO_DATA(x)				\  argument
158 		(((x) & 0x00010012) << 11)	+	\
159 		(((x) & 0x00000008) << 10)	+	\
160 		(((x) & 0x00040040) << 8)	+	\
161 		(((x) & 0x00000001) << 4)	+	\
162 		(((x) & 0x12200104) << 3)	+	\
163 		(((x) & 0x08820020) << 2)	+	\
164 		((x) & 0x40000400)			+	\
165 		(((x) & 0x00080080) >> 1)	+	\
166 		(((x) & 0x01100000) >> 4)	+	\
167 		(((x) & 0x04402000) >> 5)	+	\
168 		(((x) & 0x20008200) >> 6)	+	\
169 		(((x) & 0x80000800) >> 9)	+	\
170 		(((x) & 0x00001000) >> 12)	+	\
171 		(((x) & 0x00004000) >> 13)		\
178  *   	 -------------------
212 /* Mangle address (x) on chip U2 */
213 #define ADDR_TO_FLASH_U2(x)				\  argument
215 		(((x) & 0x00000f00) >> 4)	+	\
216 		(((x) & 0x00042000) << 1)	+	\
217 		(((x) & 0x0009c003) << 2)	+	\
218 		(((x) & 0x00021080) << 3)	+	\
219 		(((x) & 0x00000010) << 4)	+	\
220 		(((x) & 0x00000040) << 5)	+	\
221 		(((x) & 0x00000024) << 7)	+	\
222 		(((x) & 0x00000008) << 10)		\
225 /* Unmangle address (x) on chip U2 */
226 #define FLASH_U2_TO_ADDR(x)				\  argument
228 		(((x) << 4) & 0x00000f00)	+	\
229 		(((x) >> 1) & 0x00042000)	+	\
230 		(((x) >> 2) & 0x0009c003)	+	\
231 		(((x) >> 3) & 0x00021080)	+	\
232 		(((x) >> 4) & 0x00000010)	+	\
233 		(((x) >> 5) & 0x00000040)	+	\
234 		(((x) >> 7) & 0x00000024)	+	\
235 		(((x) >> 10) & 0x00000008)		\
238 /* Mangle address (x) on chip U3 */
239 #define ADDR_TO_FLASH_U3(x)				\  argument
241 		(((x) & 0x00000080) >> 3)	+	\
242 		(((x) & 0x00000040) >> 1)	+	\
243 		(((x) & 0x00052020) << 1)	+	\
244 		(((x) & 0x00084f03) << 2)	+	\
245 		(((x) & 0x00029010) << 3)	+	\
246 		(((x) & 0x00000008) << 5)	+	\
247 		(((x) & 0x00000004) << 7)		\
250 /* Unmangle address (x) on chip U3 */
251 #define FLASH_U3_TO_ADDR(x)				\  argument
253 		(((x) << 3) & 0x00000080)	+	\
254 		(((x) << 1) & 0x00000040)	+	\
255 		(((x) >> 1) & 0x00052020)	+	\
256 		(((x) >> 2) & 0x00084f03)	+	\
257 		(((x) >> 3) & 0x00029010)	+	\
258 		(((x) >> 5) & 0x00000008)	+	\
259 		(((x) >> 7) & 0x00000004)		\
264 static __u8 read8 (__u32 offset)  in read8()  argument
266    volatile __u8 *data = (__u8 *) (FLASH_OFFSET + offset);  in read8()
268    printk (KERN_DEBUG "%s(): 0x%.8x -> 0x%.2x\n", __func__, offset, *data);  in read8()
273 static __u32 read32 (__u32 offset)  in read32()  argument
275    volatile __u32 *data = (__u32 *) (FLASH_OFFSET + offset);  in read32()
277    printk (KERN_DEBUG "%s(): 0x%.8x -> 0x%.8x\n", __func__, offset, *data);  in read32()
282 static void write32 (__u32 x,__u32 offset)  in write32()  argument
284    volatile __u32 *data = (__u32 *) (FLASH_OFFSET + offset);  in write32()
285    *data = x;  in write32()
287    printk (KERN_DEBUG "%s(): 0x%.8x <- 0x%.8x\n", __func__, offset, *data);  in write32()
320  * Erase one block of flash memory at offset ``offset'' which is any
325 static inline int erase_block (__u32 offset)  in erase_block()  argument
330    printk (KERN_DEBUG "%s(): 0x%.8x\n", __func__, offset);  in erase_block()
334    write32 (DATA_TO_FLASH (ERASE_SETUP),offset);  in erase_block()
335    write32 (DATA_TO_FLASH (ERASE_CONFIRM),offset);  in erase_block()
340 		write32 (DATA_TO_FLASH (STATUS_READ),offset);  in erase_block()
341 		status = FLASH_TO_DATA (read32 (offset));  in erase_block()
346    write32 (DATA_TO_FLASH (READ_ARRAY),offset);  in erase_block()
351 		printk (KERN_WARNING "%s: erase error at address 0x%.8x.\n",module_name,offset);  in erase_block()
364    printk (KERN_DEBUG "%s(addr = 0x%.8x, len = %d)\n", __func__, instr->addr, instr->len);  in flash_erase()
376    for (i = 0; i < mtd->numeraseregions && instr->addr >= mtd->eraseregions[i].offset; i++) ;  in flash_erase()
377    i--;  in flash_erase()
385    if (i < 0 || (instr->addr & (mtd->eraseregions[i].erasesize - 1)))  in flash_erase()
386       return -EINVAL;  in flash_erase()
398 … for (; i < mtd->numeraseregions && instr->addr + instr->len >= mtd->eraseregions[i].offset; i++) ;  in flash_erase()
399    i--;  in flash_erase()
402    if (i < 0 || ((instr->addr + instr->len) & (mtd->eraseregions[i].erasesize - 1)))  in flash_erase()
403       return -EINVAL;  in flash_erase()
405    addr = instr->addr;  in flash_erase()
406    len = instr->len;  in flash_erase()
414 			 return (-EIO);  in flash_erase()
416 		addr += mtd->eraseregions[i].erasesize;  in flash_erase()
417 		len -= mtd->eraseregions[i].erasesize;  in flash_erase()
419 …if (addr == mtd->eraseregions[i].offset + (mtd->eraseregions[i].erasesize * mtd->eraseregions[i].n…  in flash_erase()
428    printk (KERN_DEBUG "%s(from = 0x%.8x, len = %d)\n", __func__, (__u32)from, len);  in flash_read()
435    if (from & (BUSWIDTH - 1))  in flash_read()
437 		int gap = BUSWIDTH - (from & (BUSWIDTH - 1));  in flash_read()
439 		while (len && gap--) {  in flash_read()
441 			len--;  in flash_read()
445    /* now we read dwords until we reach a non-dword boundary */  in flash_read()
452 		len -= BUSWIDTH;  in flash_read()
456    if (len & (BUSWIDTH - 1))  in flash_read()
457 	 while (len--) *buf++ = read8 (from++);  in flash_read()
463  * Write one dword ``x'' to flash memory at offset ``offset''. ``offset''
468 static inline int write_dword (__u32 offset,__u32 x)  in write_dword()  argument
473    printk (KERN_DEBUG "%s(): 0x%.8x <- 0x%.8x\n", __func__, offset, x);  in write_dword()
477    write32 (DATA_TO_FLASH (PGM_SETUP),offset);  in write_dword()
480    write32 (x,offset);  in write_dword()
485 		write32 (DATA_TO_FLASH (STATUS_READ),offset);  in write_dword()
486 		status = FLASH_TO_DATA (read32 (offset));  in write_dword()
491    write32 (DATA_TO_FLASH (READ_ARRAY),offset);  in write_dword()
494    if ((status & STATUS_PGM_ERR) || read32 (offset) != x)  in write_dword()
496 		printk (KERN_WARNING "%s: write error at address 0x%.8x.\n",module_name,offset);  in write_dword()
509    printk (KERN_DEBUG "%s(to = 0x%.8x, len = %d)\n", __func__, (__u32)to, len);  in flash_write()
516    if (to & (BUSWIDTH - 1))  in flash_write()
518 		__u32 aligned = to & ~(BUSWIDTH - 1);  in flash_write()
519 		int gap = to - aligned;  in flash_write()
523 		while (gap--) tmp[i++] = 0xFF;  in flash_write()
526 			len--;  in flash_write()
530 		if (!write_dword (aligned,*((__u32 *) tmp))) return (-EIO);  in flash_write()
537    /* now we write dwords until we reach a non-dword boundary */  in flash_write()
540 		if (!write_dword (to,*((__u32 *) buf))) return (-EIO);  in flash_write()
545 		len -= BUSWIDTH;  in flash_write()
549    if (len & (BUSWIDTH - 1))  in flash_write()
553 		while (len--) tmp[i++] = buf[n++];  in flash_write()
556 		if (!write_dword (to,*((__u32 *) tmp))) return (-EIO);  in flash_write()
571 		.offset		= 0x00000000,
577 		.offset	 = FLASH_BLOCKSIZE_PARAM * FLASH_NUMBLOCKS_16m_PARAM,
587 		.offset	= PART_BLOB_START,
593 		.offset	= PART_KERNEL_START,	/* MTDPART_OFS_APPEND */
599 		.offset	= PART_INITRD_START,	/* MTDPART_OFS_APPEND */
614 		return (-ENXIO);  in lart_flash_init()
634 		   "mtd.size = 0x%.8x (%uM)\n"  in lart_flash_init()
635 		   "mtd.erasesize = 0x%.8x (%uK)\n"  in lart_flash_init()
646 			   "mtd.eraseregions[%d].offset = 0x%.8x\n"  in lart_flash_init()
647 			   "mtd.eraseregions[%d].erasesize = 0x%.8x (%uK)\n"  in lart_flash_init()
649 			   result,mtd.eraseregions[result].offset,  in lart_flash_init()
659 			 "lart_partitions[%d].offset = 0x%.8x\n"  in lart_flash_init()
660 			 "lart_partitions[%d].size = 0x%.8x (%uK)\n",  in lart_flash_init()
662 			 result,lart_partitions[result].offset,  in lart_flash_init()