| /* |
| * 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 tx_irq; |
| int rx_irq; |
| 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) 0 |
| #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) |
| #endif |
| #ifndef get_lsr_cache |
| # define get_lsr_cache(p) 0 |
| #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__ */ |
