diff options
Diffstat (limited to 'arch/blackfin/include/asm/bfin_serial.h')
| -rw-r--r-- | arch/blackfin/include/asm/bfin_serial.h | 429 |
1 files changed, 429 insertions, 0 deletions
diff --git a/arch/blackfin/include/asm/bfin_serial.h b/arch/blackfin/include/asm/bfin_serial.h new file mode 100644 index 000000000..d00d73278 --- /dev/null +++ b/arch/blackfin/include/asm/bfin_serial.h @@ -0,0 +1,429 @@ +/* + * 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/circ_buf.h> +#include <linux/serial_core.h> +#include <linux/spinlock.h> +#include <linux/timer.h> +#include <linux/workqueue.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) +# if defined(BFIN_UART_BF54X_STYLE) || defined(BFIN_UART_BF60X_STYLE) +# define CONFIG_SERIAL_BFIN_HARD_CTSRTS +# else +# define CONFIG_SERIAL_BFIN_CTSRTS +# endif +#endif + +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 +#if defined(CONFIG_SERIAL_BFIN_CTSRTS) || \ + defined(CONFIG_SERIAL_BFIN_HARD_CTSRTS) + int cts_pin; + int rts_pin; +#endif +}; + +#ifdef BFIN_UART_BF60X_STYLE + +/* UART_CTL Masks */ +#define UCEN 0x1 /* Enable UARTx Clocks */ +#define LOOP_ENA 0x2 /* Loopback Mode Enable */ +#define UMOD_MDB 0x10 /* Enable MDB Mode */ +#define UMOD_IRDA 0x20 /* Enable IrDA Mode */ +#define UMOD_MASK 0x30 /* Uart Mode Mask */ +#define WLS(x) (((x-5) & 0x03) << 8) /* Word Length Select */ +#define WLS_MASK 0x300 /* Word length Select Mask */ +#define WLS_OFFSET 8 /* Word length Select Offset */ +#define STB 0x1000 /* Stop Bits */ +#define STBH 0x2000 /* Half Stop Bits */ +#define PEN 0x4000 /* Parity Enable */ +#define EPS 0x8000 /* Even Parity Select */ +#define STP 0x10000 /* Stick Parity */ +#define FPE 0x20000 /* Force Parity Error On Transmit */ +#define FFE 0x40000 /* Force Framing Error On Transmit */ +#define SB 0x80000 /* Set Break */ +#define LCR_MASK (SB | STP | EPS | PEN | STB | WLS_MASK) +#define FCPOL 0x400000 /* Flow Control Pin Polarity */ +#define RPOLC 0x800000 /* IrDA RX Polarity Change */ +#define TPOLC 0x1000000 /* IrDA TX Polarity Change */ +#define MRTS 0x2000000 /* Manual Request To Send */ +#define XOFF 0x4000000 /* Transmitter Off */ +#define ARTS 0x8000000 /* Automatic Request To Send */ +#define ACTS 0x10000000 /* Automatic Clear To Send */ +#define RFIT 0x20000000 /* Receive FIFO IRQ Threshold */ +#define RFRT 0x40000000 /* Receive FIFO RTS Threshold */ + +/* UART_STAT 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 0x80 /* TSR and UART_THR Empty */ +#define TFI 0x100 /* Transmission Finished Indicator */ + +#define ASTKY 0x200 /* Address Sticky */ +#define ADDR 0x400 /* Address bit status */ +#define RO 0x800 /* Reception Ongoing */ +#define SCTS 0x1000 /* Sticky CTS */ +#define CTS 0x10000 /* Clear To Send */ +#define RFCS 0x20000 /* Receive FIFO Count Status */ + +/* UART_CLOCK Masks */ +#define EDBO 0x80000000 /* Enable Devide by One */ + +#else /* BFIN_UART_BF60X_STYLE */ + +/* UART_LCR Masks */ +#define WLS(x) (((x)-5) & 0x03) /* Word Length Select */ +#define WLS_MASK 0x03 /* Word length Select Mask */ +#define WLS_OFFSET 0 /* Word length Select Offset */ +#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 */ +#define LCR_MASK (SB | STP | EPS | PEN | STB | WLS_MASK) + +/* 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_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 UMOD_IRDA 0x02 /* Enable IrDA Mode */ +#define UMOD_MASK 0x02 /* Uart Mode Mask */ +#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 */ + +#endif /* BFIN_UART_BF60X_STYLE */ + +/* 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 */ + +#if defined(BFIN_UART_BF60X_STYLE) +# define OFFSET_REDIV 0x00 /* Version ID Register */ +# define OFFSET_CTL 0x04 /* Control Register */ +# define OFFSET_STAT 0x08 /* Status Register */ +# define OFFSET_SCR 0x0C /* SCR Scratch Register */ +# define OFFSET_CLK 0x10 /* Clock Rate Register */ +# define OFFSET_IER 0x14 /* Interrupt Enable Register */ +# define OFFSET_IER_SET 0x18 /* Set Interrupt Enable Register */ +# define OFFSET_IER_CLEAR 0x1C /* Clear Interrupt Enable Register */ +# define OFFSET_RBR 0x20 /* Receive Buffer register */ +# define OFFSET_THR 0x24 /* Transmit Holding register */ +#elif defined(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 { +#if defined(BFIN_UART_BF60X_STYLE) + u32 revid; + u32 ctl; + u32 stat; + u32 scr; + u32 clk; + u32 ier; + u32 ier_set; + u32 ier_clear; + u32 rbr; + u32 thr; + u32 taip; + u32 tsr; + u32 rsr; + u32 txdiv; + u32 rxdiv; +#elif defined(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 + +#define port_membase(uart) (((struct bfin_serial_port *)(uart))->port.membase) + +/* +#ifndef port_membase +# define port_membase(p) 0 +#endif +*/ +#ifdef BFIN_UART_BF60X_STYLE + +#define UART_GET_CHAR(p) bfin_read32(port_membase(p) + OFFSET_RBR) +#define UART_GET_CLK(p) bfin_read32(port_membase(p) + OFFSET_CLK) +#define UART_GET_CTL(p) bfin_read32(port_membase(p) + OFFSET_CTL) +#define UART_GET_GCTL(p) UART_GET_CTL(p) +#define UART_GET_LCR(p) UART_GET_CTL(p) +#define UART_GET_MCR(p) UART_GET_CTL(p) +#if ANOMALY_16000030 +#define UART_GET_STAT(p) \ +({ \ + u32 __ret; \ + unsigned long flags; \ + flags = hard_local_irq_save(); \ + __ret = bfin_read32(port_membase(p) + OFFSET_STAT); \ + hard_local_irq_restore(flags); \ + __ret; \ +}) +#else +#define UART_GET_STAT(p) bfin_read32(port_membase(p) + OFFSET_STAT) +#endif +#define UART_GET_MSR(p) UART_GET_STAT(p) + +#define UART_PUT_CHAR(p, v) bfin_write32(port_membase(p) + OFFSET_THR, v) +#define UART_PUT_CLK(p, v) bfin_write32(port_membase(p) + OFFSET_CLK, v) +#define UART_PUT_CTL(p, v) bfin_write32(port_membase(p) + OFFSET_CTL, v) +#define UART_PUT_GCTL(p, v) UART_PUT_CTL(p, v) +#define UART_PUT_LCR(p, v) UART_PUT_CTL(p, v) +#define UART_PUT_MCR(p, v) UART_PUT_CTL(p, v) +#define UART_PUT_STAT(p, v) bfin_write32(port_membase(p) + OFFSET_STAT, v) + +#define UART_CLEAR_IER(p, v) bfin_write32(port_membase(p) + OFFSET_IER_CLEAR, v) +#define UART_GET_IER(p) bfin_read32(port_membase(p) + OFFSET_IER) +#define UART_SET_IER(p, v) bfin_write32(port_membase(p) + OFFSET_IER_SET, v) + +#define UART_CLEAR_DLAB(p) /* MMRs not muxed on BF60x */ +#define UART_SET_DLAB(p) /* MMRs not muxed on BF60x */ + +#define UART_CLEAR_LSR(p) UART_PUT_STAT(p, -1) +#define UART_GET_LSR(p) UART_GET_STAT(p) +#define UART_PUT_LSR(p, v) UART_PUT_STAT(p, v) + +/* This handles hard CTS/RTS */ +#define BFIN_UART_CTSRTS_HARD +#define UART_CLEAR_SCTS(p) UART_PUT_STAT(p, 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 /* BFIN_UART_BF60X_STYLE */ + +#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_CLK(p) ((UART_GET_DLH(p) << 8) | UART_GET_DLL(p)) +#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_CLK(p, v) do \ +{\ +UART_PUT_DLL(p, v & 0xFF); \ +UART_PUT_DLH(p, (v >> 8) & 0xFF); } while (0); + +#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) + +#define get_lsr_cache(uart) (((struct bfin_serial_port *)(uart))->lsr) +#define put_lsr_cache(uart, v) (((struct bfin_serial_port *)(uart))->lsr = (v)) + +/* +#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 /* BFIN_UART_BF54X_STYLE */ + +#endif /* BFIN_UART_BF60X_STYLE */ + +#ifndef BFIN_UART_TX_FIFO_SIZE +# define BFIN_UART_TX_FIFO_SIZE 2 +#endif + +#endif /* __BFIN_ASM_SERIAL_H__ */ |