From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sourav Poddar Subject: [PATCHv2 07/10] drivers: mtd: m25p80: Adapt driver to support memory mapped read. Date: Fri, 6 Dec 2013 19:54:48 +0530 Message-ID: <1386339891-32717-8-git-send-email-sourav.poddar@ti.com> References: <1386339891-32717-1-git-send-email-sourav.poddar@ti.com> Mime-Version: 1.0 Content-Type: text/plain Cc: , , , , , , Sourav Poddar To: , , , Return-path: In-Reply-To: <1386339891-32717-1-git-send-email-sourav.poddar-l0cyMroinI0@public.gmane.org> Sender: linux-spi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: Adapt driver to do a memory mapped read. Signed-off-by: Sourav Poddar --- v1->v2: - Add a check to Wait for the previous erase/write to finish. - Ensure proper locking drivers/mtd/devices/m25p80.c | 20 ++++++++++++++++++++ 1 files changed, 20 insertions(+), 0 deletions(-) diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c index b90c7e5..eb75d84 100644 --- a/drivers/mtd/devices/m25p80.c +++ b/drivers/mtd/devices/m25p80.c @@ -109,6 +109,7 @@ struct m25p { u8 program_opcode; u8 *command; enum read_type flash_read; + void __iomem *mem_addr; }; static inline struct m25p *mtd_to_m25p(struct mtd_info *mtd) @@ -515,6 +516,7 @@ static int m25p80_read(struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf) { struct m25p *flash = mtd_to_m25p(mtd); + struct spi_master *master = flash->spi->master; struct spi_transfer t[2]; struct spi_message m; uint8_t opcode; @@ -523,6 +525,20 @@ static int m25p80_read(struct mtd_info *mtd, loff_t from, size_t len, pr_debug("%s: %s from 0x%08x, len %zd\n", dev_name(&flash->spi->dev), __func__, (u32)from, len); + if (master->mmap) { + mutex_lock(&flash->lock); + /* Wait till previous write/erase is done. */ + if (wait_till_ready(flash)) { + mutex_unlock(&flash->lock); + return 1; + } + flash->mem_addr = master->get_buf(master); + memcpy(buf, flash->mem_addr + from, len); + master->put_buf(master); + *retlen = len; + goto out; + } + spi_message_init(&m); memset(t, 0, (sizeof t)); @@ -558,6 +574,7 @@ static int m25p80_read(struct mtd_info *mtd, loff_t from, size_t len, *retlen = m.actual_length - m25p_cmdsz(flash) - dummy; +out: mutex_unlock(&flash->lock); return 0; @@ -1286,6 +1303,9 @@ static int m25p_probe(struct spi_device *spi) flash->addr_width = 3; } + if (spi->master->configure_from_slave) + m25p80_fill_flash_information(flash); + dev_info(&spi->dev, "%s (%lld Kbytes)\n", id->name, (long long)flash->mtd.size >> 10); -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html