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// 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_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) },
{ "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,
};
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