diff options
Diffstat (limited to 'drivers/mtd/spi-nor/xilinx.c')
| -rw-r--r-- | drivers/mtd/spi-nor/xilinx.c | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/drivers/mtd/spi-nor/xilinx.c b/drivers/mtd/spi-nor/xilinx.c index 07dd11788df5..05c7fe843a7d 100644 --- a/drivers/mtd/spi-nor/xilinx.c +++ b/drivers/mtd/spi-nor/xilinx.c @@ -8,6 +8,27 @@ #include "core.h" +#define SPINOR_OP_XSE 0x50 /* Sector erase */ +#define SPINOR_OP_XPP 0x82 /* Page program */ +#define SPINOR_OP_XRDSR 0xd7 /* Read status register */ + +#define XSR_PAGESIZE BIT(0) /* Page size in Po2 or Linear */ +#define XSR_RDY BIT(7) /* Ready */ + +#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_width = 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) }, @@ -38,6 +59,57 @@ static u32 s3an_nor_convert_addr(struct spi_nor *nor, u32 addr) return page | offset; } +/** + * spi_nor_xread_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 spi_nor_xread_sr(struct spi_nor *nor, u8 *sr) +{ + int ret; + + if (nor->spimem) { + struct spi_mem_op op = + SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_XRDSR, 0), + SPI_MEM_OP_NO_ADDR, + SPI_MEM_OP_NO_DUMMY, + SPI_MEM_OP_DATA_IN(1, sr, 0)); + + 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, SPINOR_OP_XRDSR, sr, + 1); + } + + if (ret) + dev_dbg(nor->dev, "error %d reading XRDSR\n", ret); + + return ret; +} + +/** + * spi_nor_xsr_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 spi_nor_xsr_ready(struct spi_nor *nor) +{ + int ret; + + ret = spi_nor_xread_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) { @@ -83,6 +155,7 @@ static int xilinx_nor_setup(struct spi_nor *nor, static void xilinx_nor_late_init(struct spi_nor *nor) { nor->params->setup = xilinx_nor_setup; + nor->params->ready = spi_nor_xsr_ready; } static const struct spi_nor_fixups xilinx_nor_fixups = { |