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-rw-r--r--drivers/mtd/spi-nor/xilinx.c172
1 files changed, 172 insertions, 0 deletions
diff --git a/drivers/mtd/spi-nor/xilinx.c b/drivers/mtd/spi-nor/xilinx.c
new file mode 100644
index 000000000..572315773
--- /dev/null
+++ b/drivers/mtd/spi-nor/xilinx.c
@@ -0,0 +1,172 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2005, Intec Automation Inc.
+ * Copyright (C) 2014, Freescale Semiconductor, Inc.
+ */
+
+#include <linux/mtd/spi-nor.h>
+
+#include "core.h"
+
+#define XILINX_OP_SE 0x50 /* Sector erase */
+#define XILINX_OP_PP 0x82 /* Page program */
+#define XILINX_OP_RDSR 0xd7 /* Read status register */
+
+#define XSR_PAGESIZE BIT(0) /* Page size in Po2 or Linear */
+#define XSR_RDY BIT(7) /* Ready */
+
+#define XILINX_RDSR_OP(buf) \
+ SPI_MEM_OP(SPI_MEM_OP_CMD(XILINX_OP_RDSR, 0), \
+ SPI_MEM_OP_NO_ADDR, \
+ SPI_MEM_OP_NO_DUMMY, \
+ SPI_MEM_OP_DATA_IN(1, buf, 0))
+
+#define S3AN_INFO(_jedec_id, _n_sectors, _page_size) \
+ .id = { \
+ ((_jedec_id) >> 16) & 0xff, \
+ ((_jedec_id) >> 8) & 0xff, \
+ (_jedec_id) & 0xff \
+ }, \
+ .id_len = 3, \
+ .sector_size = (8 * (_page_size)), \
+ .n_sectors = (_n_sectors), \
+ .page_size = (_page_size), \
+ .addr_nbytes = 3, \
+ .flags = SPI_NOR_NO_FR
+
+/* Xilinx S3AN share MFR with Atmel SPI NOR */
+static const struct flash_info xilinx_nor_parts[] = {
+ /* Xilinx S3AN Internal Flash */
+ { "3S50AN", S3AN_INFO(0x1f2200, 64, 264) },
+ { "3S200AN", S3AN_INFO(0x1f2400, 256, 264) },
+ { "3S400AN", S3AN_INFO(0x1f2400, 256, 264) },
+ { "3S700AN", S3AN_INFO(0x1f2500, 512, 264) },
+ { "3S1400AN", S3AN_INFO(0x1f2600, 512, 528) },
+};
+
+/*
+ * This code converts an address to the Default Address Mode, that has non
+ * power of two page sizes. We must support this mode because it is the default
+ * mode supported by Xilinx tools, it can access the whole flash area and
+ * changing over to the Power-of-two mode is irreversible and corrupts the
+ * original data.
+ * Addr can safely be unsigned int, the biggest S3AN device is smaller than
+ * 4 MiB.
+ */
+static u32 s3an_nor_convert_addr(struct spi_nor *nor, u32 addr)
+{
+ u32 page_size = nor->params->page_size;
+ u32 offset, page;
+
+ offset = addr % page_size;
+ page = addr / page_size;
+ page <<= (page_size > 512) ? 10 : 9;
+
+ return page | offset;
+}
+
+/**
+ * xilinx_nor_read_sr() - Read the Status Register on S3AN flashes.
+ * @nor: pointer to 'struct spi_nor'.
+ * @sr: pointer to a DMA-able buffer where the value of the
+ * Status Register will be written.
+ *
+ * Return: 0 on success, -errno otherwise.
+ */
+static int xilinx_nor_read_sr(struct spi_nor *nor, u8 *sr)
+{
+ int ret;
+
+ if (nor->spimem) {
+ struct spi_mem_op op = XILINX_RDSR_OP(sr);
+
+ spi_nor_spimem_setup_op(nor, &op, nor->reg_proto);
+
+ ret = spi_mem_exec_op(nor->spimem, &op);
+ } else {
+ ret = spi_nor_controller_ops_read_reg(nor, XILINX_OP_RDSR, sr,
+ 1);
+ }
+
+ if (ret)
+ dev_dbg(nor->dev, "error %d reading SR\n", ret);
+
+ return ret;
+}
+
+/**
+ * xilinx_nor_sr_ready() - Query the Status Register of the S3AN flash to see
+ * if the flash is ready for new commands.
+ * @nor: pointer to 'struct spi_nor'.
+ *
+ * Return: 1 if ready, 0 if not ready, -errno on errors.
+ */
+static int xilinx_nor_sr_ready(struct spi_nor *nor)
+{
+ int ret;
+
+ ret = xilinx_nor_read_sr(nor, nor->bouncebuf);
+ if (ret)
+ return ret;
+
+ return !!(nor->bouncebuf[0] & XSR_RDY);
+}
+
+static int xilinx_nor_setup(struct spi_nor *nor,
+ const struct spi_nor_hwcaps *hwcaps)
+{
+ u32 page_size;
+ int ret;
+
+ ret = xilinx_nor_read_sr(nor, nor->bouncebuf);
+ if (ret)
+ return ret;
+
+ nor->erase_opcode = XILINX_OP_SE;
+ nor->program_opcode = XILINX_OP_PP;
+ nor->read_opcode = SPINOR_OP_READ;
+ nor->flags |= SNOR_F_NO_OP_CHIP_ERASE;
+
+ /*
+ * This flashes have a page size of 264 or 528 bytes (known as
+ * Default addressing mode). It can be changed to a more standard
+ * Power of two mode where the page size is 256/512. This comes
+ * with a price: there is 3% less of space, the data is corrupted
+ * and the page size cannot be changed back to default addressing
+ * mode.
+ *
+ * The current addressing mode can be read from the XRDSR register
+ * and should not be changed, because is a destructive operation.
+ */
+ if (nor->bouncebuf[0] & XSR_PAGESIZE) {
+ /* Flash in Power of 2 mode */
+ page_size = (nor->params->page_size == 264) ? 256 : 512;
+ nor->params->page_size = page_size;
+ nor->mtd.writebufsize = page_size;
+ nor->params->size = 8 * page_size * nor->info->n_sectors;
+ nor->mtd.erasesize = 8 * page_size;
+ } else {
+ /* Flash in Default addressing mode */
+ nor->params->convert_addr = s3an_nor_convert_addr;
+ nor->mtd.erasesize = nor->info->sector_size;
+ }
+
+ return 0;
+}
+
+static void xilinx_nor_late_init(struct spi_nor *nor)
+{
+ nor->params->setup = xilinx_nor_setup;
+ nor->params->ready = xilinx_nor_sr_ready;
+}
+
+static const struct spi_nor_fixups xilinx_nor_fixups = {
+ .late_init = xilinx_nor_late_init,
+};
+
+const struct spi_nor_manufacturer spi_nor_xilinx = {
+ .name = "xilinx",
+ .parts = xilinx_nor_parts,
+ .nparts = ARRAY_SIZE(xilinx_nor_parts),
+ .fixups = &xilinx_nor_fixups,
+};