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Mon, 6 Jun 2022 04:26:23 -0700 Envelope-to: git@xilinx.com, broonie@kernel.org, p.yadav@ti.com, miquel.raynal@bootlin.com, richard@nod.at, vigneshr@ti.com, linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, michael@walle.cc, linux-mtd@lists.infradead.org Received: from [10.140.6.18] (port=43350 helo=xhdlakshmis40.xilinx.com) by smtp.xilinx.com with esmtp (Exim 4.90) (envelope-from ) id 1nyAsI-0000SR-EU; Mon, 06 Jun 2022 04:26:22 -0700 From: Amit Kumar Mahapatra To: , , , , CC: , , , , , , , Amit Kumar Mahapatra Subject: [RFC PATCH 1/2] spi: Add multiple CS support for a single SPI device Date: Mon, 6 Jun 2022 16:56:06 +0530 Message-ID: <20220606112607.20800-2-amit.kumar-mahapatra@xilinx.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220606112607.20800-1-amit.kumar-mahapatra@xilinx.com> References: <20220606112607.20800-1-amit.kumar-mahapatra@xilinx.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 7f4e835a-f573-4bad-36d6-08da47af6422 X-MS-TrafficTypeDiagnostic: MW4PR02MB7282:EE_ X-Microsoft-Antispam-PRVS: X-Auto-Response-Suppress: DR, RN, NRN, OOF, AutoReply X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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DIR:OUT; SFP:1101; X-OriginatorOrg: xilinx.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Jun 2022 11:26:25.0378 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7f4e835a-f573-4bad-36d6-08da47af6422 X-MS-Exchange-CrossTenant-Id: 657af505-d5df-48d0-8300-c31994686c5c X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=657af505-d5df-48d0-8300-c31994686c5c; Ip=[149.199.62.198]; Helo=[xsj-pvapexch01.xlnx.xilinx.com] X-MS-Exchange-CrossTenant-AuthSource: SN1NAM02FT0021.eop-nam02.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR02MB7282 Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org For supporting multiple CS the SPI device need to be aware of all the CS values. So the "chip_select" member in the spi_device structure is now an array that holds all the CS values. spi_device structure now has a "cs_index_mask" member. This acts as an index to the chip_select array. If nth bit of spi->cs_index_mask is set then the driver would assert spi->chip_slect[n]. When flashes are connected in stacked mode SPI-NOR will enable the required chip select by setting the appropriate bit in spi->cs_index_mask. In parallel connection both the flashes need to be asserted simultaneously, this can be achieved by enabling 0th(CS0) & 1st(CS1) bit in spi->cs_index_mask. Signed-off-by: Amit Kumar Mahapatra --- drivers/spi/spi-zynqmp-gqspi.c | 30 ++++++++++++++++++++++++++---- drivers/spi/spi.c | 10 +++++++--- include/linux/spi/spi.h | 10 +++++++++- 3 files changed, 42 insertions(+), 8 deletions(-) diff --git a/drivers/spi/spi-zynqmp-gqspi.c b/drivers/spi/spi-zynqmp-gqspi.c index c760aac070e5..2535a8bca4da 100644 --- a/drivers/spi/spi-zynqmp-gqspi.c +++ b/drivers/spi/spi-zynqmp-gqspi.c @@ -136,6 +136,11 @@ #define GQSPI_MAX_NUM_CS 2 /* Maximum number of chip selects */ +#define GQSPI_SELECT_LOWER_CS BIT(0) +#define GQSPI_SELECT_UPPER_CS BIT(1) +#define GQSPI_SELECT_BOTH_CS (GQSPI_SELECT_LOWER_CS | \ + GQSPI_SELECT_UPPER_CS) + #define SPI_AUTOSUSPEND_TIMEOUT 3000 enum mode_type {GQSPI_MODE_IO, GQSPI_MODE_DMA}; @@ -361,16 +366,33 @@ static void zynqmp_qspi_chipselect(struct spi_device *qspi, bool is_high) struct zynqmp_qspi *xqspi = spi_master_get_devdata(qspi->master); ulong timeout; u32 genfifoentry = 0, statusreg; + u8 cs_index_mask = qspi->cs_index_mask; genfifoentry |= GQSPI_GENFIFO_MODE_SPI; if (!is_high) { - if (!qspi->chip_select) { - xqspi->genfifobus = GQSPI_GENFIFO_BUS_LOWER; - xqspi->genfifocs = GQSPI_GENFIFO_CS_LOWER; - } else { + /* + * GQSPI controller only supports two chip selects, + * CS0 and CS1 + */ + if (cs_index_mask & GQSPI_SELECT_BOTH_CS) { + + xqspi->genfifobus = GQSPI_GENFIFO_BUS_LOWER | + GQSPI_GENFIFO_BUS_UPPER; + xqspi->genfifocs = GQSPI_GENFIFO_CS_LOWER | + GQSPI_GENFIFO_CS_UPPER; + + } else if ((cs_index_mask & GQSPI_SELECT_UPPER_CS) && + (qspi->chip_select[GQSPI_SELECT_UPPER_CS - 1])) { + xqspi->genfifobus = GQSPI_GENFIFO_BUS_UPPER; xqspi->genfifocs = GQSPI_GENFIFO_CS_UPPER; + + } else if ((cs_index_mask & GQSPI_SELECT_LOWER_CS) && + (!qspi->chip_select[GQSPI_SELECT_LOWER_CS - 1])) { + + xqspi->genfifobus = GQSPI_GENFIFO_BUS_LOWER; + xqspi->genfifocs = GQSPI_GENFIFO_CS_LOWER; } genfifoentry |= xqspi->genfifobus; genfifoentry |= xqspi->genfifocs; diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 2e6d6bbeb784..d3077874e6e8 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -2082,6 +2082,8 @@ static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi, { u32 value; int rc; + u32 cs[SPI_CS_CNT_MAX]; + u8 idx; /* Mode (clock phase/polarity/etc.) */ if (of_property_read_bool(nc, "spi-cpha")) @@ -2154,13 +2156,15 @@ static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi, } /* Device address */ - rc = of_property_read_u32(nc, "reg", &value); - if (rc) { + rc = of_property_read_variable_u32_array(nc, "reg", &cs[0], + 1, SPI_CS_CNT_MAX); + if (rc < 0) { dev_err(&ctlr->dev, "%pOF has no valid 'reg' property (%d)\n", nc, rc); return rc; } - spi->chip_select = value; + for(idx = 0; idx < rc; idx++) + spi->chip_select[idx] = cs[idx]; /* Device speed */ if (!of_property_read_u32(nc, "spi-max-frequency", &value)) diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index 5f8c063ddff4..e930d987f3c2 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -18,6 +18,9 @@ #include #include +/* Max no. of CS supported per spi device */ +#define SPI_CS_CNT_MAX 2 + struct dma_chan; struct software_node; struct ptp_system_timestamp; @@ -148,6 +151,7 @@ extern int spi_delay_exec(struct spi_delay *_delay, struct spi_transfer *xfer); * deasserted. If @cs_change_delay is used from @spi_transfer, then the * two delays will be added up. * @statistics: statistics for the spi_device + * @cs_index_mask: Bit mask of the active chipselect(s) in the chipselect array * * A @spi_device is used to interchange data between an SPI slave * (usually a discrete chip) and CPU memory. @@ -163,7 +167,7 @@ struct spi_device { struct spi_controller *controller; struct spi_controller *master; /* compatibility layer */ u32 max_speed_hz; - u8 chip_select; + u8 chip_select[SPI_CS_CNT_MAX]; u8 bits_per_word; bool rt; #define SPI_NO_TX BIT(31) /* no transmit wire */ @@ -194,6 +198,10 @@ struct spi_device { /* the statistics */ struct spi_statistics statistics; + /* Bit mask of the chipselect(s) that the driver + * need to use form the chipselect array. + */ + u8 cs_index_mask : 2; /* * likely need more hooks for more protocol options affecting how * the controller talks to each chip, like: