229 lines
5.6 KiB
C
229 lines
5.6 KiB
C
/*
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* drivers/char/stasc.h
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*
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* ST40 Asynchronous serial controller (ASC) driver
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* Derived from sh-sci.h
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* Copyright (c) STMicroelectronics Limited
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* Author: Andrea Cisternino (March 2003)
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*
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* Documentation for the Asynchronous Serial Controller in the STm8000 SoC
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* can be found in the following documents:
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*
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* 1) DVD Platform Architecture Volume 4: I/O Devices (ADCS: 7402381)
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* 2) STm8000 Datasheet (ADCS: 7323276)
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*/
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#ifndef _STASC_H
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#define _STASC_H
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#include <linux/serial_core.h>
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#include <linux/clk.h>
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#include <linux/stm/pad.h>
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#include <linux/stm/stm-dma.h>
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struct asc_port_fdma {
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int ready;
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int enabled;
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struct asc_port_fdma_rx_channel *rx;
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unsigned int rx_req_id;
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struct asc_port_fdma_tx_channel *tx;
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unsigned int tx_req_id;
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};
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struct asc_port {
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struct uart_port port;
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struct stm_pad_config *pad_config;
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struct stm_pad_state *pad_state;
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struct clk *clk;
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int hw_flow_control:1;
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int txfifo_bug:1;
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int suspended:1;
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int check_parity:1;
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#ifdef CONFIG_SERIAL_STM_ASC_FDMA
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struct asc_port_fdma fdma;
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#endif
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#ifdef CONFIG_PM
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unsigned long pm_ctrl;
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unsigned long pm_baud;
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unsigned long pm_irq;
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#endif
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};
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#define ASC_MAJOR 204
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#define ASC_MINOR_START 40
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#define FIFO_SIZE 16
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#define ASC_MAX_PORTS 4
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/*---- Global variables ---------------------------------------*/
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extern struct asc_port asc_ports[ASC_MAX_PORTS];
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/*---- UART Register definitions ------------------------------*/
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/* Register offsets */
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#define ASC_BAUDRATE 0x00
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#define ASC_TXBUF 0x04
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#define ASC_RXBUF 0x08
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#define ASC_CTL 0x0C
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#define ASC_INTEN 0x10
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#define ASC_STA 0x14
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#define ASC_GUARDTIME 0x18
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#define ASC_TIMEOUT 0x1C
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#define ASC_TXRESET 0x20
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#define ASC_RXRESET 0x24
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#define ASC_RETRIES 0x28
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/* ASC_RXBUF */
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#define ASC_RXBUF_PE 0x100
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#define ASC_RXBUF_FE 0x200
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/* ASC_CTL */
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#define ASC_CTL_MODE_MSK 0x0007
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#define ASC_CTL_MODE_8BIT 0x0001
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#define ASC_CTL_MODE_7BIT_PAR 0x0003
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#define ASC_CTL_MODE_9BIT 0x0004
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#define ASC_CTL_MODE_8BIT_WKUP 0x0005
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#define ASC_CTL_MODE_8BIT_PAR 0x0007
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#define ASC_CTL_STOP_MSK 0x0018
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#define ASC_CTL_STOP_HALFBIT 0x0000
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#define ASC_CTL_STOP_1BIT 0x0008
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#define ASC_CTL_STOP_1_HALFBIT 0x0010
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#define ASC_CTL_STOP_2BIT 0x0018
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#define ASC_CTL_PARITYODD 0x0020
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#define ASC_CTL_LOOPBACK 0x0040
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#define ASC_CTL_RUN 0x0080
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#define ASC_CTL_RXENABLE 0x0100
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#define ASC_CTL_SCENABLE 0x0200
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#define ASC_CTL_FIFOENABLE 0x0400
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#define ASC_CTL_CTSENABLE 0x0800
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#define ASC_CTL_BAUDMODE 0x1000
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/* ASC_GUARDTIME */
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#define ASC_GUARDTIME_MSK 0x00FF
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/* ASC_INTEN */
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#define ASC_INTEN_RBE 0x0001
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#define ASC_INTEN_TE 0x0002
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#define ASC_INTEN_THE 0x0004
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#define ASC_INTEN_PE 0x0008
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#define ASC_INTEN_FE 0x0010
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#define ASC_INTEN_OE 0x0020
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#define ASC_INTEN_TNE 0x0040
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#define ASC_INTEN_TOI 0x0080
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#define ASC_INTEN_RHF 0x0100
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/* ASC_RETRIES */
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#define ASC_RETRIES_MSK 0x00FF
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/* ASC_RXBUF */
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#define ASC_RXBUF_MSK 0x03FF
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/* ASC_STA */
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#define ASC_STA_RBF 0x0001
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#define ASC_STA_TE 0x0002
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#define ASC_STA_THE 0x0004
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#define ASC_STA_PE 0x0008
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#define ASC_STA_FE 0x0010
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#define ASC_STA_OE 0x0020
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#define ASC_STA_TNE 0x0040
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#define ASC_STA_TOI 0x0080
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#define ASC_STA_RHF 0x0100
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#define ASC_STA_TF 0x0200
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#define ASC_STA_NKD 0x0400
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/* ASC_TIMEOUT */
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#define ASC_TIMEOUT_MSK 0x00FF
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/* ASC_TXBUF */
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#define ASC_TXBUF_MSK 0x01FF
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/*---- Values for the BAUDRATE Register -----------------------*/
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/*
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* MODE 0
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* recommended for low bit rates (below 19.2K)
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*
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* ICCLK
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* ASCBaudRate = ----------------
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* baudrate * 16
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*
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* MODE 1
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* recommended for high bit rates (above 19.2K)
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*
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* baudrate * 16 * 2^16
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* ASCBaudRate = ------------------------
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* ICCLK
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*/
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#define ADJ 1
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#define BAUDRATE_VAL_M0(bps, clk) \
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((clk) / (16 * (bps)))
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#define BAUDRATE_VAL_M1(bps, clk) \
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(((bps * (1 << 14)) / ((clk) / (1 << 6))) + ADJ)
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/*---- Access macros ------------------------------------------*/
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#define ASC_FUNC(name, offset) \
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static inline unsigned int asc_##name##_in(struct uart_port *port) \
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{ \
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return (readl(port->membase + (offset))); \
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} \
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\
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static inline void asc_##name##_out(struct uart_port *port, \
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unsigned int value) \
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{ \
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writel(value, port->membase + (offset)); \
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}
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ASC_FUNC(BAUDRATE, ASC_BAUDRATE)
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ASC_FUNC(TXBUF, ASC_TXBUF)
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ASC_FUNC(RXBUF, ASC_RXBUF)
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ASC_FUNC(CTL, ASC_CTL)
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ASC_FUNC(INTEN, ASC_INTEN)
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ASC_FUNC(STA, ASC_STA)
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ASC_FUNC(GUARDTIME, ASC_GUARDTIME)
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ASC_FUNC(TIMEOUT, ASC_TIMEOUT)
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ASC_FUNC(TXRESET, ASC_TXRESET)
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ASC_FUNC(RXRESET, ASC_RXRESET)
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ASC_FUNC(RETRIES, ASC_RETRIES)
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#define asc_in(port, reg) asc_ ## reg ## _in (port)
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#define asc_out(port, reg, value) asc_ ## reg ## _out ((port), (value))
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/*---- FDMA interface ------------------------------------------*/
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#ifdef CONFIG_SERIAL_STM_ASC_FDMA
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int asc_fdma_startup(struct uart_port *port);
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void asc_fdma_shutdown(struct uart_port *port);
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int asc_fdma_enable(struct uart_port *port);
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void asc_fdma_disable(struct uart_port *port);
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static inline int asc_fdma_enabled(struct uart_port *port)
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{
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return asc_ports[port->line].fdma.enabled;
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}
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#else
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int asc_fdma_startup(struct uart_port *port) { return -ENOSYS; }
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void asc_fdma_shutdown(struct uart_port *port) {}
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static inline int asc_fdma_enable(struct uart_port *port) { return -ENOSYS; }
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static inline void asc_fdma_disable(struct uart_port *port) {}
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static inline int asc_fdma_enabled(struct uart_port *port) { return 0; }
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#endif
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int asc_fdma_tx_start(struct uart_port *port);
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void asc_fdma_tx_stop(struct uart_port *port);
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void asc_fdma_rx_stop(struct uart_port *port);
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void asc_fdma_rx_timeout(struct uart_port *port);
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#endif /* _STASC_H */
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