From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sourav Poddar Subject: [PATCH 06/17] spi/qspi: Add support to switc to memory mapped operation. Date: Tue, 26 Nov 2013 13:05:02 +0530 Message-ID: <1385451313-1875-7-git-send-email-sourav.poddar@ti.com> References: <1385451313-1875-1-git-send-email-sourav.poddar@ti.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1385451313-1875-1-git-send-email-sourav.poddar-l0cyMroinI0@public.gmane.org> Sender: linux-spi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: computersforpeace-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, linux-mtd-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Cc: balbi-l0cyMroinI0@public.gmane.org, linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, bcousson-rdvid1DuHRBWk0Htik3J/w@public.gmane.org, Sourav Poddar List-Id: devicetree@vger.kernel.org These add apis that can be used to switch to memory mapped operatons by configuring control module and qspi registers. Signed-off-by: Sourav Poddar --- drivers/spi/spi-ti-qspi.c | 28 ++++++++++++++++++++++++++++ 1 files changed, 28 insertions(+), 0 deletions(-) diff --git a/drivers/spi/spi-ti-qspi.c b/drivers/spi/spi-ti-qspi.c index 39aefd7..40f1c35 100644 --- a/drivers/spi/spi-ti-qspi.c +++ b/drivers/spi/spi-ti-qspi.c @@ -113,6 +113,10 @@ struct ti_qspi { #define QSPI_CSPOL(n) (1 << (1 + n * 8)) #define QSPI_CKPOL(n) (1 << (n * 8)) +#define MM_SWITCH (1 << 0) +#define MEM_CS (1 << 8) +#define MEM_CS_DIS (0 << 8) + #define QSPI_FRAME 4096 #define QSPI_AUTOSUSPEND_TIMEOUT 2000 @@ -129,6 +133,30 @@ static inline void ti_qspi_write(struct ti_qspi *qspi, writel(val, qspi->base + reg); } +void enable_qspi_memory_mapped(struct ti_qspi *qspi) +{ + u32 val; + + ti_qspi_write(qspi, MM_SWITCH, QSPI_SPI_SWITCH_REG); + if (qspi->ctrl_mod) { + val = readl(qspi->ctrl_base); + val |= MEM_CS; + writel(val, qspi->ctrl_base); + } +} + +void disable_qspi_memory_mapped(struct ti_qspi *qspi) +{ + u32 val; + + ti_qspi_write(qspi, ~MM_SWITCH, QSPI_SPI_SWITCH_REG); + if (qspi->ctrl_mod) { + val = readl(qspi->ctrl_base); + val &= MEM_CS_DIS; + writel(val, qspi->ctrl_base); + } +} + static int ti_qspi_setup(struct spi_device *spi) { struct ti_qspi *qspi = spi_master_get_devdata(spi->master); -- 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