2  * MTD SPI driver for ST M25Pxx (and similar) serial flash chips
26 #include <linux/spi/spi.h>
27 #include <linux/spi/spi-mem.h>
28 #include <linux/spi/flash.h>
29 #include <linux/mtd/spi-nor.h>
38 	struct m25p *flash = nor->priv;  in m25p80_read_reg()  local
48 		return -ENOMEM;  in m25p80_read_reg()
51 	ret = spi_mem_exec_op(flash->spimem, &op);  in m25p80_read_reg()
53 		dev_err(&flash->spimem->spi->dev, "error %d reading %x\n", ret,  in m25p80_read_reg()
65 	struct m25p *flash = nor->priv;  in m25p80_write_reg()  local
75 		return -ENOMEM;  in m25p80_write_reg()
78 	ret = spi_mem_exec_op(flash->spimem, &op);  in m25p80_write_reg()
87 	struct m25p *flash = nor->priv;  in m25p80_write()  local
89 			SPI_MEM_OP(SPI_MEM_OP_CMD(nor->program_opcode, 1),  in m25p80_write()
90 				   SPI_MEM_OP_ADDR(nor->addr_width, to, 1),  in m25p80_write()
96 	op.cmd.buswidth = spi_nor_get_protocol_inst_nbits(nor->write_proto);  in m25p80_write()
97 	op.addr.buswidth = spi_nor_get_protocol_addr_nbits(nor->write_proto);  in m25p80_write()
98 	op.data.buswidth = spi_nor_get_protocol_data_nbits(nor->write_proto);  in m25p80_write()
100 	if (nor->program_opcode == SPINOR_OP_AAI_WP && nor->sst_write_second)  in m25p80_write()
103 	ret = spi_mem_adjust_op_size(flash->spimem, &op);  in m25p80_write()
108 	ret = spi_mem_exec_op(flash->spimem, &op);  in m25p80_write()
122 	struct m25p *flash = nor->priv;  in m25p80_read()  local
124 			SPI_MEM_OP(SPI_MEM_OP_CMD(nor->read_opcode, 1),  in m25p80_read()
125 				   SPI_MEM_OP_ADDR(nor->addr_width, from, 1),  in m25p80_read()
126 				   SPI_MEM_OP_DUMMY(nor->read_dummy, 1),  in m25p80_read()
132 	op.cmd.buswidth = spi_nor_get_protocol_inst_nbits(nor->read_proto);  in m25p80_read()
133 	op.addr.buswidth = spi_nor_get_protocol_addr_nbits(nor->read_proto);  in m25p80_read()
135 	op.data.buswidth = spi_nor_get_protocol_data_nbits(nor->read_proto);  in m25p80_read()
138 	op.dummy.nbytes = (nor->read_dummy * op.dummy.buswidth) / 8;  in m25p80_read()
142 		ret = spi_mem_adjust_op_size(flash->spimem, &op);  in m25p80_read()
146 		ret = spi_mem_exec_op(flash->spimem, &op);  in m25p80_read()
151 		remaining -= op.data.nbytes;  in m25p80_read()
159  * board specific setup should have ensured the SPI clock used here
165 	struct spi_device *spi = spimem->spi;  in m25p_probe()  local
167 	struct m25p *flash;  in m25p_probe()  local
177 	data = dev_get_platdata(&spimem->spi->dev);  in m25p_probe()
179 	flash = devm_kzalloc(&spimem->spi->dev, sizeof(*flash), GFP_KERNEL);  in m25p_probe()
180 	if (!flash)  in m25p_probe()
181 		return -ENOMEM;  in m25p_probe()
183 	nor = &flash->spi_nor;  in m25p_probe()
186 	nor->read = m25p80_read;  in m25p_probe()
187 	nor->write = m25p80_write;  in m25p_probe()
188 	nor->write_reg = m25p80_write_reg;  in m25p_probe()
189 	nor->read_reg = m25p80_read_reg;  in m25p_probe()
191 	nor->dev = &spimem->spi->dev;  in m25p_probe()
192 	spi_nor_set_flash_node(nor, spi->dev.of_node);  in m25p_probe()
193 	nor->priv = flash;  in m25p_probe()
195 	spi_mem_set_drvdata(spimem, flash);  in m25p_probe()
196 	flash->spimem = spimem;  in m25p_probe()
198 	if (spi->mode & SPI_RX_QUAD) {  in m25p_probe()
201 		if (spi->mode & SPI_TX_QUAD)  in m25p_probe()
205 	} else if (spi->mode & SPI_RX_DUAL) {  in m25p_probe()
208 		if (spi->mode & SPI_TX_DUAL)  in m25p_probe()
212 	if (data && data->name)  in m25p_probe()
213 		nor->mtd.name = data->name;  in m25p_probe()
215 	if (!nor->mtd.name)  in m25p_probe()
216 		nor->mtd.name = spi_mem_get_name(spimem);  in m25p_probe()
223 	if (data && data->type)  in m25p_probe()
224 		flash_name = data->type;  in m25p_probe()
225 	else if (!strcmp(spi->modalias, "spi-nor"))  in m25p_probe()
226 		flash_name = NULL; /* auto-detect */  in m25p_probe()
228 		flash_name = spi->modalias;  in m25p_probe()
234 	return mtd_device_register(&nor->mtd, data ? data->parts : NULL,  in m25p_probe()
235 				   data ? data->nr_parts : 0);  in m25p_probe()
241 	struct m25p	*flash = spi_mem_get_drvdata(spimem);  in m25p_remove()  local
243 	spi_nor_restore(&flash->spi_nor);  in m25p_remove()
246 	return mtd_device_unregister(&flash->spi_nor.mtd);  in m25p_remove()
251 	struct m25p *flash = spi_mem_get_drvdata(spimem);  in m25p_shutdown()  local
253 	spi_nor_restore(&flash->spi_nor);  in m25p_shutdown()
258  * Historically, many flash devices are bound to this driver by their name. But
259  * since most of these flash are compatible to some extent, and their
260  * differences can often be differentiated by the JEDEC read-ID command, we
261  * encourage new users to add support to the spi-nor library, and simply bind
262  * against a generic string here (e.g., "jedec,spi-nor").
264  * Many flash names are kept here in this list (as well as in spi-nor.c) to
269 	 * Allow non-DT platform devices to bind to the "spi-nor" modalias, and
270 	 * hack around the fact that the SPI core does not provide uevent
273 	{"spi-nor"},
277 	 * them with "spi-nor" in platform data.
282 	 * Entries that were used in DTs without "jedec,spi-nor" fallback and
298 	{"m25p05-nonjedec"},	{"m25p10-nonjedec"},	{"m25p20-nonjedec"},
299 	{"m25p40-nonjedec"},	{"m25p80-nonjedec"},	{"m25p16-nonjedec"},
300 	{"m25p32-nonjedec"},	{"m25p64-nonjedec"},	{"m25p128-nonjedec"},
302 	/* Everspin MRAMs (non-JEDEC) */
310 MODULE_DEVICE_TABLE(spi, m25p_ids);
314 	 * Generic compatibility for SPI NOR that can be identified by the
317 	{ .compatible = "jedec,spi-nor" },
334 	/* REVISIT: many of these chips have deep power-down modes, which
344 MODULE_DESCRIPTION("MTD SPI driver for ST M25Pxx flash chips");