--- /dev/null
+/*
+ * bfin_serial.h - Blackfin UART/Serial definitions
+ *
+ * Copyright 2006-2010 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#ifndef __BFIN_ASM_SERIAL_H__
+#define __BFIN_ASM_SERIAL_H__
+
+#include <linux/serial_core.h>
+#include <linux/spinlock.h>
+#include <mach/anomaly.h>
+#include <mach/bfin_serial.h>
+
+#if defined(CONFIG_BFIN_UART0_CTSRTS) || \
+ defined(CONFIG_BFIN_UART1_CTSRTS) || \
+ defined(CONFIG_BFIN_UART2_CTSRTS) || \
+ defined(CONFIG_BFIN_UART3_CTSRTS)
+# ifdef BFIN_UART_BF54X_STYLE
+# define CONFIG_SERIAL_BFIN_HARD_CTSRTS
+# else
+# define CONFIG_SERIAL_BFIN_CTSRTS
+# endif
+#endif
+
+struct circ_buf;
+struct timer_list;
+struct work_struct;
+
+struct bfin_serial_port {
+ struct uart_port port;
+ unsigned int old_status;
+ int status_irq;
+#ifndef BFIN_UART_BF54X_STYLE
+ unsigned int lsr;
+#endif
+#ifdef CONFIG_SERIAL_BFIN_DMA
+ int tx_done;
+ int tx_count;
+ struct circ_buf rx_dma_buf;
+ struct timer_list rx_dma_timer;
+ int rx_dma_nrows;
+ spinlock_t rx_lock;
+ unsigned int tx_dma_channel;
+ unsigned int rx_dma_channel;
+ struct work_struct tx_dma_workqueue;
+#elif ANOMALY_05000363
+ unsigned int anomaly_threshold;
+#endif
+#ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
+ int scts;
+#endif
+#if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \
+ defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS)
+ int cts_pin;
+ int rts_pin;
+#endif
+};
+
+/* UART_LCR Masks */
+#define WLS(x) (((x)-5) & 0x03) /* Word Length Select */
+#define STB 0x04 /* Stop Bits */
+#define PEN 0x08 /* Parity Enable */
+#define EPS 0x10 /* Even Parity Select */
+#define STP 0x20 /* Stick Parity */
+#define SB 0x40 /* Set Break */
+#define DLAB 0x80 /* Divisor Latch Access */
+
+/* UART_LSR Masks */
+#define DR 0x01 /* Data Ready */
+#define OE 0x02 /* Overrun Error */
+#define PE 0x04 /* Parity Error */
+#define FE 0x08 /* Framing Error */
+#define BI 0x10 /* Break Interrupt */
+#define THRE 0x20 /* THR Empty */
+#define TEMT 0x40 /* TSR and UART_THR Empty */
+#define TFI 0x80 /* Transmission Finished Indicator */
+
+/* UART_IER Masks */
+#define ERBFI 0x01 /* Enable Receive Buffer Full Interrupt */
+#define ETBEI 0x02 /* Enable Transmit Buffer Empty Interrupt */
+#define ELSI 0x04 /* Enable RX Status Interrupt */
+#define EDSSI 0x08 /* Enable Modem Status Interrupt */
+#define EDTPTI 0x10 /* Enable DMA Transmit PIRQ Interrupt */
+#define ETFI 0x20 /* Enable Transmission Finished Interrupt */
+#define ERFCI 0x40 /* Enable Receive FIFO Count Interrupt */
+
+/* UART_MCR Masks */
+#define XOFF 0x01 /* Transmitter Off */
+#define MRTS 0x02 /* Manual Request To Send */
+#define RFIT 0x04 /* Receive FIFO IRQ Threshold */
+#define RFRT 0x08 /* Receive FIFO RTS Threshold */
+#define LOOP_ENA 0x10 /* Loopback Mode Enable */
+#define FCPOL 0x20 /* Flow Control Pin Polarity */
+#define ARTS 0x40 /* Automatic Request To Send */
+#define ACTS 0x80 /* Automatic Clear To Send */
+
+/* UART_MSR Masks */
+#define SCTS 0x01 /* Sticky CTS */
+#define CTS 0x10 /* Clear To Send */
+#define RFCS 0x20 /* Receive FIFO Count Status */
+
+/* UART_GCTL Masks */
+#define UCEN 0x01 /* Enable UARTx Clocks */
+#define IREN 0x02 /* Enable IrDA Mode */
+#define TPOLC 0x04 /* IrDA TX Polarity Change */
+#define RPOLC 0x08 /* IrDA RX Polarity Change */
+#define FPE 0x10 /* Force Parity Error On Transmit */
+#define FFE 0x20 /* Force Framing Error On Transmit */
+
+#ifdef BFIN_UART_BF54X_STYLE
+# define OFFSET_DLL 0x00 /* Divisor Latch (Low-Byte) */
+# define OFFSET_DLH 0x04 /* Divisor Latch (High-Byte) */
+# define OFFSET_GCTL 0x08 /* Global Control Register */
+# define OFFSET_LCR 0x0C /* Line Control Register */
+# define OFFSET_MCR 0x10 /* Modem Control Register */
+# define OFFSET_LSR 0x14 /* Line Status Register */
+# define OFFSET_MSR 0x18 /* Modem Status Register */
+# define OFFSET_SCR 0x1C /* SCR Scratch Register */
+# define OFFSET_IER_SET 0x20 /* Set Interrupt Enable Register */
+# define OFFSET_IER_CLEAR 0x24 /* Clear Interrupt Enable Register */
+# define OFFSET_THR 0x28 /* Transmit Holding register */
+# define OFFSET_RBR 0x2C /* Receive Buffer register */
+#else /* BF533 style */
+# define OFFSET_THR 0x00 /* Transmit Holding register */
+# define OFFSET_RBR 0x00 /* Receive Buffer register */
+# define OFFSET_DLL 0x00 /* Divisor Latch (Low-Byte) */
+# define OFFSET_DLH 0x04 /* Divisor Latch (High-Byte) */
+# define OFFSET_IER 0x04 /* Interrupt Enable Register */
+# define OFFSET_IIR 0x08 /* Interrupt Identification Register */
+# define OFFSET_LCR 0x0C /* Line Control Register */
+# define OFFSET_MCR 0x10 /* Modem Control Register */
+# define OFFSET_LSR 0x14 /* Line Status Register */
+# define OFFSET_MSR 0x18 /* Modem Status Register */
+# define OFFSET_SCR 0x1C /* SCR Scratch Register */
+# define OFFSET_GCTL 0x24 /* Global Control Register */
+/* code should not need IIR, so force build error if they use it */
+# undef OFFSET_IIR
+#endif
+
+/*
+ * All Blackfin system MMRs are padded to 32bits even if the register
+ * itself is only 16bits. So use a helper macro to streamline this.
+ */
+#define __BFP(m) u16 m; u16 __pad_##m
+struct bfin_uart_regs {
+#ifdef BFIN_UART_BF54X_STYLE
+ __BFP(dll);
+ __BFP(dlh);
+ __BFP(gctl);
+ __BFP(lcr);
+ __BFP(mcr);
+ __BFP(lsr);
+ __BFP(msr);
+ __BFP(scr);
+ __BFP(ier_set);
+ __BFP(ier_clear);
+ __BFP(thr);
+ __BFP(rbr);
+#else
+ union {
+ u16 dll;
+ u16 thr;
+ const u16 rbr;
+ };
+ const u16 __pad0;
+ union {
+ u16 dlh;
+ u16 ier;
+ };
+ const u16 __pad1;
+ const __BFP(iir);
+ __BFP(lcr);
+ __BFP(mcr);
+ __BFP(lsr);
+ __BFP(msr);
+ __BFP(scr);
+ const u32 __pad2;
+ __BFP(gctl);
+#endif
+};
+#undef __BFP
+
+#ifndef port_membase
+# define port_membase(p) (((struct bfin_serial_port *)(p))->port.membase)
+#endif
+
+#define UART_GET_CHAR(p) bfin_read16(port_membase(p) + OFFSET_RBR)
+#define UART_GET_DLL(p) bfin_read16(port_membase(p) + OFFSET_DLL)
+#define UART_GET_DLH(p) bfin_read16(port_membase(p) + OFFSET_DLH)
+#define UART_GET_GCTL(p) bfin_read16(port_membase(p) + OFFSET_GCTL)
+#define UART_GET_LCR(p) bfin_read16(port_membase(p) + OFFSET_LCR)
+#define UART_GET_MCR(p) bfin_read16(port_membase(p) + OFFSET_MCR)
+#define UART_GET_MSR(p) bfin_read16(port_membase(p) + OFFSET_MSR)
+
+#define UART_PUT_CHAR(p, v) bfin_write16(port_membase(p) + OFFSET_THR, v)
+#define UART_PUT_DLL(p, v) bfin_write16(port_membase(p) + OFFSET_DLL, v)
+#define UART_PUT_DLH(p, v) bfin_write16(port_membase(p) + OFFSET_DLH, v)
+#define UART_PUT_GCTL(p, v) bfin_write16(port_membase(p) + OFFSET_GCTL, v)
+#define UART_PUT_LCR(p, v) bfin_write16(port_membase(p) + OFFSET_LCR, v)
+#define UART_PUT_MCR(p, v) bfin_write16(port_membase(p) + OFFSET_MCR, v)
+
+#ifdef BFIN_UART_BF54X_STYLE
+
+#define UART_CLEAR_IER(p, v) bfin_write16(port_membase(p) + OFFSET_IER_CLEAR, v)
+#define UART_GET_IER(p) bfin_read16(port_membase(p) + OFFSET_IER_SET)
+#define UART_SET_IER(p, v) bfin_write16(port_membase(p) + OFFSET_IER_SET, v)
+
+#define UART_CLEAR_DLAB(p) /* MMRs not muxed on BF54x */
+#define UART_SET_DLAB(p) /* MMRs not muxed on BF54x */
+
+#define UART_CLEAR_LSR(p) bfin_write16(port_membase(p) + OFFSET_LSR, -1)
+#define UART_GET_LSR(p) bfin_read16(port_membase(p) + OFFSET_LSR)
+#define UART_PUT_LSR(p, v) bfin_write16(port_membase(p) + OFFSET_LSR, v)
+
+/* This handles hard CTS/RTS */
+#define BFIN_UART_CTSRTS_HARD
+#define UART_CLEAR_SCTS(p) bfin_write16((port_membase(p) + OFFSET_MSR), SCTS)
+#define UART_GET_CTS(x) (UART_GET_MSR(x) & CTS)
+#define UART_DISABLE_RTS(x) UART_PUT_MCR(x, UART_GET_MCR(x) & ~(ARTS | MRTS))
+#define UART_ENABLE_RTS(x) UART_PUT_MCR(x, UART_GET_MCR(x) | MRTS | ARTS)
+#define UART_ENABLE_INTS(x, v) UART_SET_IER(x, v)
+#define UART_DISABLE_INTS(x) UART_CLEAR_IER(x, 0xF)
+
+#else /* BF533 style */
+
+#define UART_CLEAR_IER(p, v) UART_PUT_IER(p, UART_GET_IER(p) & ~(v))
+#define UART_GET_IER(p) bfin_read16(port_membase(p) + OFFSET_IER)
+#define UART_PUT_IER(p, v) bfin_write16(port_membase(p) + OFFSET_IER, v)
+#define UART_SET_IER(p, v) UART_PUT_IER(p, UART_GET_IER(p) | (v))
+
+#define UART_CLEAR_DLAB(p) do { UART_PUT_LCR(p, UART_GET_LCR(p) & ~DLAB); SSYNC(); } while (0)
+#define UART_SET_DLAB(p) do { UART_PUT_LCR(p, UART_GET_LCR(p) | DLAB); SSYNC(); } while (0)
+
+#ifndef put_lsr_cache
+# define put_lsr_cache(p, v) (((struct bfin_serial_port *)(p))->lsr = (v))
+#endif
+#ifndef get_lsr_cache
+# define get_lsr_cache(p) (((struct bfin_serial_port *)(p))->lsr)
+#endif
+
+/* The hardware clears the LSR bits upon read, so we need to cache
+ * some of the more fun bits in software so they don't get lost
+ * when checking the LSR in other code paths (TX).
+ */
+static inline void UART_CLEAR_LSR(void *p)
+{
+ put_lsr_cache(p, 0);
+ bfin_write16(port_membase(p) + OFFSET_LSR, -1);
+}
+static inline unsigned int UART_GET_LSR(void *p)
+{
+ unsigned int lsr = bfin_read16(port_membase(p) + OFFSET_LSR);
+ put_lsr_cache(p, get_lsr_cache(p) | (lsr & (BI|FE|PE|OE)));
+ return lsr | get_lsr_cache(p);
+}
+static inline void UART_PUT_LSR(void *p, uint16_t val)
+{
+ put_lsr_cache(p, get_lsr_cache(p) & ~val);
+}
+
+/* This handles soft CTS/RTS */
+#define UART_GET_CTS(x) gpio_get_value((x)->cts_pin)
+#define UART_DISABLE_RTS(x) gpio_set_value((x)->rts_pin, 1)
+#define UART_ENABLE_RTS(x) gpio_set_value((x)->rts_pin, 0)
+#define UART_ENABLE_INTS(x, v) UART_PUT_IER(x, v)
+#define UART_DISABLE_INTS(x) UART_PUT_IER(x, 0)
+
+#endif
+
+#ifndef BFIN_UART_TX_FIFO_SIZE
+# define BFIN_UART_TX_FIFO_SIZE 2
+#endif
+
+#endif /* __BFIN_ASM_SERIAL_H__ */
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