serial: pic32_uart: Add PIC32 UART driver
This adds UART and a serial console driver for Microchip PIC32 class
devices.
[ralf@linux-mips.org: Resolved merge conflict.]
Signed-off-by: Andrei Pistirica <andrei.pistirica@microchip.com>
Signed-off-by: Joshua Henderson <joshua.henderson@microchip.com>
Reviewed-by: Alan Cox <alan@linux.intel.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: linux-kernel@vger.kernel.org
Cc: linux-mips@linux-mips.org
Cc: linux-serial@vger.kernel.org
Cc: linux-api@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/12101/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/drivers/tty/serial/pic32_uart.h b/drivers/tty/serial/pic32_uart.h
new file mode 100644
index 0000000..ec379da
--- /dev/null
+++ b/drivers/tty/serial/pic32_uart.h
@@ -0,0 +1,126 @@
+/*
+ * PIC32 Integrated Serial Driver.
+ *
+ * Copyright (C) 2015 Microchip Technology, Inc.
+ *
+ * Authors:
+ * Sorin-Andrei Pistirica <andrei.pistirica@microchip.com>
+ *
+ * Licensed under GPLv2 or later.
+ */
+#ifndef __DT_PIC32_UART_H__
+#define __DT_PIC32_UART_H__
+
+#define PIC32_UART_DFLT_BRATE (9600)
+#define PIC32_UART_TX_FIFO_DEPTH (8)
+#define PIC32_UART_RX_FIFO_DEPTH (8)
+
+#define PIC32_UART_MODE 0x00
+#define PIC32_UART_STA 0x10
+#define PIC32_UART_TX 0x20
+#define PIC32_UART_RX 0x30
+#define PIC32_UART_BRG 0x40
+
+struct pic32_console_opt {
+ int baud;
+ int parity;
+ int bits;
+ int flow;
+};
+
+/* struct pic32_sport - pic32 serial port descriptor
+ * @port: uart port descriptor
+ * @idx: port index
+ * @irq_fault: virtual fault interrupt number
+ * @irqflags_fault: flags related to fault irq
+ * @irq_fault_name: irq fault name
+ * @irq_rx: virtual rx interrupt number
+ * @irqflags_rx: flags related to rx irq
+ * @irq_rx_name: irq rx name
+ * @irq_tx: virtual tx interrupt number
+ * @irqflags_tx: : flags related to tx irq
+ * @irq_tx_name: irq tx name
+ * @cts_gpio: clear to send gpio
+ * @dev: device descriptor
+ **/
+struct pic32_sport {
+ struct uart_port port;
+ struct pic32_console_opt opt;
+ int idx;
+
+ int irq_fault;
+ int irqflags_fault;
+ const char *irq_fault_name;
+ int irq_rx;
+ int irqflags_rx;
+ const char *irq_rx_name;
+ int irq_tx;
+ int irqflags_tx;
+ const char *irq_tx_name;
+ u8 enable_tx_irq;
+
+ bool hw_flow_ctrl;
+ int cts_gpio;
+
+ int ref_clk;
+ struct clk *clk;
+
+ struct device *dev;
+};
+#define to_pic32_sport(c) container_of(c, struct pic32_sport, port)
+#define pic32_get_port(sport) (&sport->port)
+#define pic32_get_opt(sport) (&sport->opt)
+#define tx_irq_enabled(sport) (sport->enable_tx_irq)
+
+static inline void pic32_uart_writel(struct pic32_sport *sport,
+ u32 reg, u32 val)
+{
+ struct uart_port *port = pic32_get_port(sport);
+
+ __raw_writel(val, port->membase + reg);
+}
+
+static inline u32 pic32_uart_readl(struct pic32_sport *sport, u32 reg)
+{
+ struct uart_port *port = pic32_get_port(sport);
+
+ return __raw_readl(port->membase + reg);
+}
+
+/* pic32 uart mode register bits */
+#define PIC32_UART_MODE_ON BIT(15)
+#define PIC32_UART_MODE_FRZ BIT(14)
+#define PIC32_UART_MODE_SIDL BIT(13)
+#define PIC32_UART_MODE_IREN BIT(12)
+#define PIC32_UART_MODE_RTSMD BIT(11)
+#define PIC32_UART_MODE_RESV1 BIT(10)
+#define PIC32_UART_MODE_UEN1 BIT(9)
+#define PIC32_UART_MODE_UEN0 BIT(8)
+#define PIC32_UART_MODE_WAKE BIT(7)
+#define PIC32_UART_MODE_LPBK BIT(6)
+#define PIC32_UART_MODE_ABAUD BIT(5)
+#define PIC32_UART_MODE_RXINV BIT(4)
+#define PIC32_UART_MODE_BRGH BIT(3)
+#define PIC32_UART_MODE_PDSEL1 BIT(2)
+#define PIC32_UART_MODE_PDSEL0 BIT(1)
+#define PIC32_UART_MODE_STSEL BIT(0)
+
+/* pic32 uart status register bits */
+#define PIC32_UART_STA_UTXISEL1 BIT(15)
+#define PIC32_UART_STA_UTXISEL0 BIT(14)
+#define PIC32_UART_STA_UTXINV BIT(13)
+#define PIC32_UART_STA_URXEN BIT(12)
+#define PIC32_UART_STA_UTXBRK BIT(11)
+#define PIC32_UART_STA_UTXEN BIT(10)
+#define PIC32_UART_STA_UTXBF BIT(9)
+#define PIC32_UART_STA_TRMT BIT(8)
+#define PIC32_UART_STA_URXISEL1 BIT(7)
+#define PIC32_UART_STA_URXISEL0 BIT(6)
+#define PIC32_UART_STA_ADDEN BIT(5)
+#define PIC32_UART_STA_RIDLE BIT(4)
+#define PIC32_UART_STA_PERR BIT(3)
+#define PIC32_UART_STA_FERR BIT(2)
+#define PIC32_UART_STA_OERR BIT(1)
+#define PIC32_UART_STA_URXDA BIT(0)
+
+#endif /* __DT_PIC32_UART_H__ */