From mboxrd@z Thu Jan 1 00:00:00 1970 From: Boris Brezillon Subject: [PATCH RFC 03/18] spi: spi-mem: Prepare things for DTR mode support Date: Fri, 12 Oct 2018 10:48:10 +0200 Message-ID: <20181012084825.23697-4-boris.brezillon@bootlin.com> References: <20181012084825.23697-1-boris.brezillon@bootlin.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: Julien Su , Mark Brown , Mason Yang , linux-spi@vger.kernel.org, zhengxunli@mxic.com.tw To: David Woodhouse , Brian Norris , Boris Brezillon , Marek Vasut , Richard Weinberger , linux-mtd@lists.infradead.org, Yogesh Gaur , Vignesh R , Cyrille Pitchen Return-path: In-Reply-To: <20181012084825.23697-1-boris.brezillon@bootlin.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-mtd" Errors-To: linux-mtd-bounces+gldm-linux-mtd-36=gmane.org@lists.infradead.org List-Id: linux-spi.vger.kernel.org Add dtr fields to the spi_mem_op struct and make sure all DTR operations are rejected for now. We intentionally do not expose a new flag at the spi_device level, since spi memories seem to be the only users of this feature. Signed-off-by: Boris Brezillon --- drivers/spi/spi-mem.c | 3 +++ include/linux/spi/spi-mem.h | 48 +++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 51 insertions(+) diff --git a/drivers/spi/spi-mem.c b/drivers/spi/spi-mem.c index 2379efcaf1c6..3da57219b539 100644 --- a/drivers/spi/spi-mem.c +++ b/drivers/spi/spi-mem.c @@ -154,6 +154,9 @@ static bool spi_mem_default_supports_op(struct spi_mem *mem, op->data.dir == SPI_MEM_DATA_OUT)) return false; + if (op->cmd.dtr || op->addr.dtr || op->dummy.dtr || op->data.dtr) + return false; + return true; } EXPORT_SYMBOL_GPL(spi_mem_default_supports_op); diff --git a/include/linux/spi/spi-mem.h b/include/linux/spi/spi-mem.h index 69ee30456864..cad116005034 100644 --- a/include/linux/spi/spi-mem.h +++ b/include/linux/spi/spi-mem.h @@ -19,6 +19,13 @@ .opcode = __opcode, \ } +#define SPI_MEM_OP_DTR_CMD(__opcode, __buswidth) \ + { \ + .buswidth = __buswidth, \ + .opcode = __opcode, \ + .dtr = true, \ + } + #define SPI_MEM_OP_ADDR(__nbytes, __val, __buswidth) \ { \ .nbytes = __nbytes, \ @@ -26,6 +33,14 @@ .buswidth = __buswidth, \ } +#define SPI_MEM_OP_DTR_ADDR(__nbytes, __val, __buswidth) \ + { \ + .nbytes = __nbytes, \ + .val = __val, \ + .buswidth = __buswidth, \ + .dtr = true, \ + } + #define SPI_MEM_OP_NO_ADDR { } #define SPI_MEM_OP_DUMMY(__nbytes, __buswidth) \ @@ -34,6 +49,13 @@ .buswidth = __buswidth, \ } +#define SPI_MEM_OP_DTR_DUMMY(__nbytes, __buswidth) \ + { \ + .nbytes = __nbytes, \ + .buswidth = __buswidth, \ + .dtr = true, \ + } + #define SPI_MEM_OP_NO_DUMMY { } #define SPI_MEM_OP_DATA_IN(__nbytes, __buf, __buswidth) \ @@ -44,6 +66,15 @@ .buswidth = __buswidth, \ } +#define SPI_MEM_OP_DTR_DATA_IN(__nbytes, __buf, __buswidth) \ + { \ + .dir = SPI_MEM_DATA_IN, \ + .nbytes = __nbytes, \ + .buf.in = __buf, \ + .buswidth = __buswidth, \ + .dtr = true, \ + } + #define SPI_MEM_OP_DATA_OUT(__nbytes, __buf, __buswidth) \ { \ .dir = SPI_MEM_DATA_OUT, \ @@ -52,6 +83,15 @@ .buswidth = __buswidth, \ } +#define SPI_MEM_OP_DTR_DATA_OUT(__nbytes, __buf, __buswidth) \ + { \ + .dir = SPI_MEM_DATA_OUT, \ + .nbytes = __nbytes, \ + .buf.out = __buf, \ + .buswidth = __buswidth, \ + .dtr = true, \ + } + #define SPI_MEM_OP_NO_DATA { } /** @@ -68,10 +108,12 @@ enum spi_mem_data_dir { /** * struct spi_mem_op - describes a SPI memory operation * @cmd.buswidth: number of IO lines used to transmit the command + * @cmd.dtr: set true to transfer opcode in double transfer rate mode * @cmd.opcode: operation opcode * @addr.nbytes: number of address bytes to send. Can be zero if the operation * does not need to send an address * @addr.buswidth: number of IO lines used to transmit the address cycles + * @addr.dtr: set true to transfer address bytes in double transfer rate mode * @addr.val: address value. This value is always sent MSB first on the bus. * Note that only @addr.nbytes are taken into account in this * address value, so users should make sure the value fits in the @@ -79,34 +121,40 @@ enum spi_mem_data_dir { * @dummy.nbytes: number of dummy bytes to send after an opcode or address. Can * be zero if the operation does not require dummy bytes * @dummy.buswidth: number of IO lanes used to transmit the dummy bytes + * @dummy.dtr: set true to transfer dummy bytes in double transfer rate mode * @data.buswidth: number of IO lanes used to send/receive the data * @data.dir: direction of the transfer * @data.nbytes: number of data bytes to send/receive. Can be zero if the * operation does not involve transferring data + * @data.dtr: set true to transfer data bytes in double transfer rate mode * @data.buf.in: input buffer (must be DMA-able) * @data.buf.out: output buffer (must be DMA-able) */ struct spi_mem_op { struct { u8 buswidth; + bool dtr; u8 opcode; } cmd; struct { u8 nbytes; u8 buswidth; + bool dtr; u64 val; } addr; struct { u8 nbytes; u8 buswidth; + bool dtr; } dummy; struct { u8 buswidth; enum spi_mem_data_dir dir; unsigned int nbytes; + bool dtr; union { void *in; const void *out; -- 2.14.1 ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/