From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sourav Poddar Subject: [PATCH 07/17] spi/qspi: configure set up register for memory map.. Date: Tue, 26 Nov 2013 13:05:03 +0530 Message-ID: <1385451313-1875-8-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@ti.com> Sender: linux-omap-owner@vger.kernel.org To: computersforpeace@gmail.com, broonie@kernel.org, linux-mtd@lists.infradead.org, linux-spi@vger.kernel.org Cc: balbi@ti.com, linux-omap@vger.kernel.org, devicetree@vger.kernel.org, bcousson@baylibre.com, Sourav Poddar List-Id: devicetree@vger.kernel.org These add api to configure set up registers which will be used for memory mapped operations. These was provided as a pointer in the earlier patch and can be used by the slave devices to configure the master controller as an when required according to the usecases. 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 40f1c35..2323572 100644 --- a/drivers/spi/spi-ti-qspi.c +++ b/drivers/spi/spi-ti-qspi.c @@ -117,6 +117,10 @@ struct ti_qspi { #define MEM_CS (1 << 8) #define MEM_CS_DIS (0 << 8) +#define QSPI_SETUP0_RD_NORMAL (0x0 << 12) +#define QSPI_SETUP0_RD_DUAL (0x1 << 12) +#define QSPI_SETUP0_RD_QUAD (0x3 << 12) + #define QSPI_FRAME 4096 #define QSPI_AUTOSUSPEND_TIMEOUT 2000 @@ -220,6 +224,29 @@ static int ti_qspi_setup(struct spi_device *spi) return 0; } +static void ti_qspi_configure_from_slave(struct spi_device *spi, u8 *val) +{ + struct ti_qspi *qspi = spi_master_get_devdata(spi->master); + u32 memval, mode; + + mode = spi->mode & (SPI_RX_DUAL | SPI_RX_QUAD); + memval = (val[0] << 0) | (val[1] << 16) | + ((val[2] - 1) << 8) | (val[3] << 10); + + switch (mode) { + case SPI_RX_DUAL: + memval |= QSPI_SETUP0_RD_DUAL; + break; + case SPI_RX_QUAD: + memval |= QSPI_SETUP0_RD_QUAD; + break; + default: + memval |= QSPI_SETUP0_RD_NORMAL; + break; + } + ti_qspi_write(qspi, memval, QSPI_SPI_SETUP0_REG); +} + static void ti_qspi_restore_ctx(struct ti_qspi *qspi) { struct ti_qspi_regs *ctx_reg = &qspi->ctx_reg; @@ -487,6 +514,7 @@ static int ti_qspi_probe(struct platform_device *pdev) master->transfer_one_message = ti_qspi_start_transfer_one; master->dev.of_node = pdev->dev.of_node; master->bits_per_word_mask = BIT(32 - 1) | BIT(16 - 1) | BIT(8 - 1); + master->configure_from_slave = ti_qspi_configure_from_slave; if (!of_property_read_u32(np, "num-cs", &num_cs)) master->num_chipselect = num_cs; -- 1.7.1