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From:   <Ajay.Kathat@microchip.com>
To:     <linux-wireless@vger.kernel.org>
CC:     <Claudiu.Beznea@microchip.com>, <Ajay.Kathat@microchip.com>
Subject: [PATCH 05/12] wilc1000: add reset/terminate/repeat command support
 for SPI bus
Thread-Topic: [PATCH 05/12] wilc1000: add reset/terminate/repeat command
 support for SPI bus
Thread-Index: AQHXOG6ijAl2K25sXEivkuk3dLQvdA==
Date:   Fri, 23 Apr 2021 18:29:45 +0000
Message-ID: <20210423182925.5865-6-ajay.kathat@microchip.com>
References: <20210423182925.5865-1-ajay.kathat@microchip.com>
In-Reply-To: <20210423182925.5865-1-ajay.kathat@microchip.com>
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From: Ajay Singh <ajay.kathat@microchip.com>

Added API to send reset/terminate/repeat SPI commands to FW.

Signed-off-by: Ajay Singh <ajay.kathat@microchip.com>
---
 drivers/net/wireless/microchip/wilc1000/spi.c | 61 +++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/drivers/net/wireless/microchip/wilc1000/spi.c b/drivers/net/wi=
reless/microchip/wilc1000/spi.c
index 1472e9843896..607c8b642865 100644
--- a/drivers/net/wireless/microchip/wilc1000/spi.c
+++ b/drivers/net/wireless/microchip/wilc1000/spi.c
@@ -143,6 +143,12 @@ struct wilc_spi_rsp_data {
 	u8 data[];
 } __packed;
=20
+struct wilc_spi_special_cmd_rsp {
+	u8 skip_byte;
+	u8 rsp_cmd_type;
+	u8 status;
+} __packed;
+
 static int wilc_bus_probe(struct spi_device *spi)
 {
 	int ret;
@@ -705,6 +711,61 @@ static int wilc_spi_dma_rw(struct wilc *wilc, u8 cmd, =
u32 adr, u8 *b, u32 sz)
 	return 0;
 }
=20
+static int wilc_spi_special_cmd(struct wilc *wilc, u8 cmd)
+{
+	struct spi_device *spi =3D to_spi_device(wilc->dev);
+	struct wilc_spi *spi_priv =3D wilc->bus_data;
+	u8 wb[32], rb[32];
+	int cmd_len, resp_len =3D 0;
+	struct wilc_spi_cmd *c;
+	struct wilc_spi_special_cmd_rsp *r;
+
+	if (cmd !=3D CMD_TERMINATE && cmd !=3D CMD_REPEAT && cmd !=3D CMD_RESET)
+		return -EINVAL;
+
+	memset(wb, 0x0, sizeof(wb));
+	memset(rb, 0x0, sizeof(rb));
+	c =3D (struct wilc_spi_cmd *)wb;
+	c->cmd_type =3D cmd;
+
+	if (cmd =3D=3D CMD_RESET)
+		memset(c->u.simple_cmd.addr, 0xFF, 3);
+
+	cmd_len =3D offsetof(struct wilc_spi_cmd, u.simple_cmd.crc);
+	resp_len =3D sizeof(*r);
+
+	if (spi_priv->crc7_enabled) {
+		c->u.simple_cmd.crc[0] =3D wilc_get_crc7(wb, cmd_len);
+		cmd_len +=3D 1;
+	}
+	if (cmd_len + resp_len > ARRAY_SIZE(wb)) {
+		dev_err(&spi->dev, "spi buffer size too small (%d) (%d) (%zu)\n",
+			cmd_len, resp_len, ARRAY_SIZE(wb));
+		return -EINVAL;
+	}
+
+	if (wilc_spi_tx_rx(wilc, wb, rb, cmd_len + resp_len)) {
+		dev_err(&spi->dev, "Failed cmd write, bus error...\n");
+		return -EINVAL;
+	}
+
+	r =3D (struct wilc_spi_special_cmd_rsp *)&rb[cmd_len];
+	if (r->rsp_cmd_type !=3D cmd) {
+		if (!spi_priv->probing_crc)
+			dev_err(&spi->dev,
+				"Failed cmd response, cmd (%02x), resp (%02x)\n",
+				cmd, r->rsp_cmd_type);
+		return -EINVAL;
+	}
+
+	if (r->status !=3D WILC_SPI_COMMAND_STAT_SUCCESS) {
+		dev_err(&spi->dev, "Failed cmd state response state (%02x)\n",
+			r->status);
+		return -EINVAL;
+	}
+	return 0;
+}
+
 static int wilc_spi_read_reg(struct wilc *wilc, u32 addr, u32 *data)
 {
 	struct spi_device *spi =3D to_spi_device(wilc->dev);
--=20
2.24.0