1 files changed, 258 insertions, 0 deletions
diff --git a/drivers/tty/serial/stm32-usart.h b/drivers/tty/serial/stm32-usart.h
new file mode 100644
index 000000000..00daee7f8
--- /dev/null
+++ b/drivers/tty/serial/stm32-usart.h
@@ -0,0 +1,258 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) Maxime Coquelin 2015
+ * Copyright (C) STMicroelectronics SA 2017
+ * Authors:  Maxime Coquelin <mcoquelin.stm32@gmail.com>
+ *	     Gerald Baeza <gerald_baeza@yahoo.fr>
+ */
+
+#define DRIVER_NAME "stm32-usart"
+
+struct stm32_usart_offsets {
+	u8 cr1;
+	u8 cr2;
+	u8 cr3;
+	u8 brr;
+	u8 gtpr;
+	u8 rtor;
+	u8 rqr;
+	u8 isr;
+	u8 icr;
+	u8 rdr;
+	u8 tdr;
+};
+
+struct stm32_usart_config {
+	u8 uart_enable_bit; /* USART_CR1_UE */
+	bool has_7bits_data;
+	bool has_wakeup;
+	bool has_fifo;
+};
+
+struct stm32_usart_info {
+	struct stm32_usart_offsets ofs;
+	struct stm32_usart_config cfg;
+};
+
+#define UNDEF_REG 0xff
+
+/* Register offsets */
+struct stm32_usart_info stm32f4_info = {
+	.ofs = {
+		.isr	= 0x00,
+		.rdr	= 0x04,
+		.tdr	= 0x04,
+		.brr	= 0x08,
+		.cr1	= 0x0c,
+		.cr2	= 0x10,
+		.cr3	= 0x14,
+		.gtpr	= 0x18,
+		.rtor	= UNDEF_REG,
+		.rqr	= UNDEF_REG,
+		.icr	= UNDEF_REG,
+	},
+	.cfg = {
+		.uart_enable_bit = 13,
+		.has_7bits_data = false,
+	}
+};
+
+struct stm32_usart_info stm32f7_info = {
+	.ofs = {
+		.cr1	= 0x00,
+		.cr2	= 0x04,
+		.cr3	= 0x08,
+		.brr	= 0x0c,
+		.gtpr	= 0x10,
+		.rtor	= 0x14,
+		.rqr	= 0x18,
+		.isr	= 0x1c,
+		.icr	= 0x20,
+		.rdr	= 0x24,
+		.tdr	= 0x28,
+	},
+	.cfg = {
+		.uart_enable_bit = 0,
+		.has_7bits_data = true,
+	}
+};
+
+struct stm32_usart_info stm32h7_info = {
+	.ofs = {
+		.cr1	= 0x00,
+		.cr2	= 0x04,
+		.cr3	= 0x08,
+		.brr	= 0x0c,
+		.gtpr	= 0x10,
+		.rtor	= 0x14,
+		.rqr	= 0x18,
+		.isr	= 0x1c,
+		.icr	= 0x20,
+		.rdr	= 0x24,
+		.tdr	= 0x28,
+	},
+	.cfg = {
+		.uart_enable_bit = 0,
+		.has_7bits_data = true,
+		.has_wakeup = true,
+		.has_fifo = true,
+	}
+};
+
+/* USART_SR (F4) / USART_ISR (F7) */
+#define USART_SR_PE		BIT(0)
+#define USART_SR_FE		BIT(1)
+#define USART_SR_NF		BIT(2)
+#define USART_SR_ORE		BIT(3)
+#define USART_SR_IDLE		BIT(4)
+#define USART_SR_RXNE		BIT(5)
+#define USART_SR_TC		BIT(6)
+#define USART_SR_TXE		BIT(7)
+#define USART_SR_CTSIF		BIT(9)
+#define USART_SR_CTS		BIT(10)		/* F7 */
+#define USART_SR_RTOF		BIT(11)		/* F7 */
+#define USART_SR_EOBF		BIT(12)		/* F7 */
+#define USART_SR_ABRE		BIT(14)		/* F7 */
+#define USART_SR_ABRF		BIT(15)		/* F7 */
+#define USART_SR_BUSY		BIT(16)		/* F7 */
+#define USART_SR_CMF		BIT(17)		/* F7 */
+#define USART_SR_SBKF		BIT(18)		/* F7 */
+#define USART_SR_WUF		BIT(20)		/* H7 */
+#define USART_SR_TEACK		BIT(21)		/* F7 */
+#define USART_SR_ERR_MASK	(USART_SR_ORE | USART_SR_FE | USART_SR_PE)
+/* Dummy bits */
+#define USART_SR_DUMMY_RX	BIT(16)
+
+/* USART_DR */
+#define USART_DR_MASK		GENMASK(8, 0)
+
+/* USART_BRR */
+#define USART_BRR_DIV_F_MASK	GENMASK(3, 0)
+#define USART_BRR_DIV_M_MASK	GENMASK(15, 4)
+#define USART_BRR_DIV_M_SHIFT	4
+#define USART_BRR_04_R_SHIFT	1
+
+/* USART_CR1 */
+#define USART_CR1_SBK		BIT(0)
+#define USART_CR1_RWU		BIT(1)		/* F4 */
+#define USART_CR1_UESM		BIT(1)		/* H7 */
+#define USART_CR1_RE		BIT(2)
+#define USART_CR1_TE		BIT(3)
+#define USART_CR1_IDLEIE	BIT(4)
+#define USART_CR1_RXNEIE	BIT(5)
+#define USART_CR1_TCIE		BIT(6)
+#define USART_CR1_TXEIE		BIT(7)
+#define USART_CR1_PEIE		BIT(8)
+#define USART_CR1_PS		BIT(9)
+#define USART_CR1_PCE		BIT(10)
+#define USART_CR1_WAKE		BIT(11)
+#define USART_CR1_M0		BIT(12)		/* F7 (CR1_M for F4) */
+#define USART_CR1_MME		BIT(13)		/* F7 */
+#define USART_CR1_CMIE		BIT(14)		/* F7 */
+#define USART_CR1_OVER8		BIT(15)
+#define USART_CR1_DEDT_MASK	GENMASK(20, 16)	/* F7 */
+#define USART_CR1_DEAT_MASK	GENMASK(25, 21)	/* F7 */
+#define USART_CR1_RTOIE		BIT(26)		/* F7 */
+#define USART_CR1_EOBIE		BIT(27)		/* F7 */
+#define USART_CR1_M1		BIT(28)		/* F7 */
+#define USART_CR1_IE_MASK	(GENMASK(8, 4) | BIT(14) | BIT(26) | BIT(27))
+#define USART_CR1_FIFOEN	BIT(29)		/* H7 */
+#define USART_CR1_DEAT_SHIFT 21
+#define USART_CR1_DEDT_SHIFT 16
+
+/* USART_CR2 */
+#define USART_CR2_ADD_MASK	GENMASK(3, 0)	/* F4 */
+#define USART_CR2_ADDM7		BIT(4)		/* F7 */
+#define USART_CR2_LBCL		BIT(8)
+#define USART_CR2_CPHA		BIT(9)
+#define USART_CR2_CPOL		BIT(10)
+#define USART_CR2_CLKEN		BIT(11)
+#define USART_CR2_STOP_2B	BIT(13)
+#define USART_CR2_STOP_MASK	GENMASK(13, 12)
+#define USART_CR2_LINEN		BIT(14)
+#define USART_CR2_SWAP		BIT(15)		/* F7 */
+#define USART_CR2_RXINV		BIT(16)		/* F7 */
+#define USART_CR2_TXINV		BIT(17)		/* F7 */
+#define USART_CR2_DATAINV	BIT(18)		/* F7 */
+#define USART_CR2_MSBFIRST	BIT(19)		/* F7 */
+#define USART_CR2_ABREN		BIT(20)		/* F7 */
+#define USART_CR2_ABRMOD_MASK	GENMASK(22, 21)	/* F7 */
+#define USART_CR2_RTOEN		BIT(23)		/* F7 */
+#define USART_CR2_ADD_F7_MASK	GENMASK(31, 24)	/* F7 */
+
+/* USART_CR3 */
+#define USART_CR3_EIE		BIT(0)
+#define USART_CR3_IREN		BIT(1)
+#define USART_CR3_IRLP		BIT(2)
+#define USART_CR3_HDSEL		BIT(3)
+#define USART_CR3_NACK		BIT(4)
+#define USART_CR3_SCEN		BIT(5)
+#define USART_CR3_DMAR		BIT(6)
+#define USART_CR3_DMAT		BIT(7)
+#define USART_CR3_RTSE		BIT(8)
+#define USART_CR3_CTSE		BIT(9)
+#define USART_CR3_CTSIE		BIT(10)
+#define USART_CR3_ONEBIT	BIT(11)
+#define USART_CR3_OVRDIS	BIT(12)		/* F7 */
+#define USART_CR3_DDRE		BIT(13)		/* F7 */
+#define USART_CR3_DEM		BIT(14)		/* F7 */
+#define USART_CR3_DEP		BIT(15)		/* F7 */
+#define USART_CR3_SCARCNT_MASK	GENMASK(19, 17)	/* F7 */
+#define USART_CR3_WUS_MASK	GENMASK(21, 20)	/* H7 */
+#define USART_CR3_WUS_START_BIT	BIT(21)		/* H7 */
+#define USART_CR3_WUFIE		BIT(22)		/* H7 */
+
+/* USART_GTPR */
+#define USART_GTPR_PSC_MASK	GENMASK(7, 0)
+#define USART_GTPR_GT_MASK	GENMASK(15, 8)
+
+/* USART_RTOR */
+#define USART_RTOR_RTO_MASK	GENMASK(23, 0)	/* F7 */
+#define USART_RTOR_BLEN_MASK	GENMASK(31, 24)	/* F7 */
+
+/* USART_RQR */
+#define USART_RQR_ABRRQ		BIT(0)		/* F7 */
+#define USART_RQR_SBKRQ		BIT(1)		/* F7 */
+#define USART_RQR_MMRQ		BIT(2)		/* F7 */
+#define USART_RQR_RXFRQ		BIT(3)		/* F7 */
+#define USART_RQR_TXFRQ		BIT(4)		/* F7 */
+
+/* USART_ICR */
+#define USART_ICR_PECF		BIT(0)		/* F7 */
+#define USART_ICR_FECF		BIT(1)		/* F7 */
+#define USART_ICR_ORECF		BIT(3)		/* F7 */
+#define USART_ICR_IDLECF	BIT(4)		/* F7 */
+#define USART_ICR_TCCF		BIT(6)		/* F7 */
+#define USART_ICR_CTSCF		BIT(9)		/* F7 */
+#define USART_ICR_RTOCF		BIT(11)		/* F7 */
+#define USART_ICR_EOBCF		BIT(12)		/* F7 */
+#define USART_ICR_CMCF		BIT(17)		/* F7 */
+#define USART_ICR_WUCF		BIT(20)		/* H7 */
+
+#define STM32_SERIAL_NAME "ttySTM"
+#define STM32_MAX_PORTS 8
+
+#define RX_BUF_L 200		 /* dma rx buffer length     */
+#define RX_BUF_P RX_BUF_L	 /* dma rx buffer period     */
+#define TX_BUF_L 200		 /* dma tx buffer length     */
+
+struct stm32_port {
+	struct uart_port port;
+	struct clk *clk;
+	struct stm32_usart_info *info;
+	struct dma_chan *rx_ch;  /* dma rx channel            */
+	dma_addr_t rx_dma_buf;   /* dma rx buffer bus address */
+	unsigned char *rx_buf;   /* dma rx buffer cpu address */
+	struct dma_chan *tx_ch;  /* dma tx channel            */
+	dma_addr_t tx_dma_buf;   /* dma tx buffer bus address */
+	unsigned char *tx_buf;   /* dma tx buffer cpu address */
+	int last_res;
+	bool tx_dma_busy;	 /* dma tx busy               */
+	bool hw_flow_control;
+	bool fifoen;
+	int wakeirq;
+	int rdr_mask;		/* receive data register mask */
+};
+
+static struct stm32_port stm32_ports[STM32_MAX_PORTS];
+static struct uart_driver stm32_usart_driver;