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Thu, 18 Nov 2021 21:19:29 -0800 (PST) Received: from scdiu3.sunplus.com ([113.196.136.192]) by smtp.googlemail.com with ESMTPSA id c2sm1332935pfv.112.2021.11.18.21.19.27 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 18 Nov 2021 21:19:29 -0800 (PST) From: Hammer Hsieh X-Google-Original-From: Hammer Hsieh To: gregkh@linuxfoundation.org, robh+dt@kernel.org, linux-serial@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, jirislaby@kernel.org, p.zabel@pengutronix.de Cc: tony.huang@sunplus.com, wells.lu@sunplus.com, Hammer Hsieh Subject: [PATCH v3 1/2] dt-bindings:serial:Add bindings doc for Sunplus SoC UART Driver Date: Fri, 19 Nov 2021 13:19:22 +0800 Message-Id: <1637299163-6460-2-git-send-email-hammer.hsieh@sunplus.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1637299163-6460-1-git-send-email-hammer.hsieh@sunplus.com> References: <1635752903-14968-1-git-send-email-hammer.hsieh@sunplus.com> <1637299163-6460-1-git-send-email-hammer.hsieh@sunplus.com> Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org Add bindings doc for Sunplus SoC UART Driver Signed-off-by: Hammer Hsieh --- Changes in v3: - Modify yaml file based on uart driver (remove dma function). .../bindings/serial/sunplus,sp7021-uart.yaml | 58 ++++++++++++++++++++++ MAINTAINERS | 5 ++ 2 files changed, 63 insertions(+) create mode 100644 Documentation/devicetree/bindings/serial/sunplus,sp7021-uart.yaml diff --git a/Documentation/devicetree/bindings/serial/sunplus,sp7021-uart.yaml b/Documentation/devicetree/bindings/serial/sunplus,sp7021-uart.yaml new file mode 100644 index 0000000..df11074 --- /dev/null +++ b/Documentation/devicetree/bindings/serial/sunplus,sp7021-uart.yaml @@ -0,0 +1,58 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +# Copyright (C) Sunplus Co., Ltd. 2021 +%YAML 1.2 +--- +$id: "http://devicetree.org/schemas/serial/sunplus,sp7021-uart.yaml#" +$schema: "http://devicetree.org/meta-schemas/core.yaml#" + +title: Sunplus SoC SP7021 UART Controller Device Tree Bindings + +maintainers: + - Tony Huang + - Hammer Hsieh + - Wells Lu + +allOf: + - $ref: serial.yaml# + +properties: + compatible: + const: sunplus,sp7021-uart + + reg: + maxItems: 1 + + interrupts: + maxItems: 1 + + clocks: + maxItems: 1 + + resets: + maxItems: 1 + +required: + - compatible + - reg + - interrupts + - clocks + - resets + +additionalProperties: false + +examples: + - | + #include + aliases { + serial0 = &uart0; + }; + + uart0: serial@9c000900 { + compatible = "sunplus,sp7021-uart"; + reg = <0x9c000900 0x80>; + interrupt-parent = <&intc>; + interrupts = <53 IRQ_TYPE_LEVEL_HIGH>; + clocks = <&clkc 0x28>; + resets = <&rstc 0x18>; + }; +... diff --git a/MAINTAINERS b/MAINTAINERS index 3b79fd4..f2ee40c 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -17945,6 +17945,11 @@ L: netdev@vger.kernel.org S: Maintained F: drivers/net/ethernet/dlink/sundance.c +SUNPLUS UART DRIVER +M: Hammer Hsieh +S: Maintained +F: Documentation/devicetree/bindings/serial/sunplus,sp7021-uart.yaml + SUPERH M: Yoshinori Sato M: Rich Felker From patchwork Wed Nov 10 07:51:10 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hammer Hsieh X-Patchwork-Id: 517673 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7801BC43219 for ; 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Tue, 09 Nov 2021 23:51:21 -0800 (PST) Received: from scdiu3.sunplus.com ([113.196.136.192]) by smtp.googlemail.com with ESMTPSA id p20sm9131838pfw.96.2021.11.09.23.51.19 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 09 Nov 2021 23:51:20 -0800 (PST) From: Hammer Hsieh X-Google-Original-From: Hammer Hsieh To: gregkh@linuxfoundation.org, robh+dt@kernel.org, linux-serial@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, jirislaby@kernel.org, p.zabel@pengutronix.de Cc: tony.huang@sunplus.com, wells.lu@sunplus.com, Hammer Hsieh Subject: [PATCH v2 2/2] serial:sunplus-uart:Add Sunplus SoC UART Driver Date: Wed, 10 Nov 2021 15:51:10 +0800 Message-Id: <1636530670-6995-3-git-send-email-hammer.hsieh@sunplus.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1636530670-6995-1-git-send-email-hammer.hsieh@sunplus.com> References: <1635752903-14968-1-git-send-email-hammer.hsieh@sunplus.com> <1636530670-6995-1-git-send-email-hammer.hsieh@sunplus.com> Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org Add Sunplus SoC UART Driver Signed-off-by: Hammer Hsieh --- Changes in v2: - Addressed all comments from Mr. Greg Kroah-Hartman. MAINTAINERS | 2 + drivers/tty/serial/Kconfig | 23 + drivers/tty/serial/Makefile | 1 + drivers/tty/serial/sunplus-uart.c | 1591 +++++++++++++++++++++++++++++++++++++ include/soc/sunplus/sp_uart.h | 147 ++++ 5 files changed, 1764 insertions(+) create mode 100644 drivers/tty/serial/sunplus-uart.c create mode 100644 include/soc/sunplus/sp_uart.h diff --git a/MAINTAINERS b/MAINTAINERS index f2ee40c..14790a4 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -17949,6 +17949,8 @@ SUNPLUS UART DRIVER M: Hammer Hsieh S: Maintained F: Documentation/devicetree/bindings/serial/sunplus,sp7021-uart.yaml +F: drivers/tty/serial/sunplus-uart.c +F: include/soc/sunplus/sp-uart.h SUPERH M: Yoshinori Sato diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index 131a6a5..319f5db 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -1561,6 +1561,29 @@ config SERIAL_LITEUART_CONSOLE and warnings and which allows logins in single user mode). Otherwise, say 'N'. +config SERIAL_SUNPLUS + bool "Sunplus UART support" + depends on OF + select SERIAL_CORE + help + Select this option if you would like to use Sunplus serial port on + Sunplus SoC SP7021. + If you enable this option, Sunplus serial ports in the system will + be registered as ttySx. + +config SERIAL_SUNPLUS_CONSOLE + bool "Console on Sunplus UART" + depends on SERIAL_SUNPLUS + select SERIAL_CORE_CONSOLE + select SERIAL_EARLYCON + help + Select this option if you would like to use a Sunplus UART as the + system console. + Even if you say Y here, the currently visible virtual console + (/dev/tty0) will still be used as the system console by default, but + you can alter that using a kernel command line option such as + "console=ttySx". + endmenu config SERIAL_MCTRL_GPIO diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile index 7da0856..61cc8de 100644 --- a/drivers/tty/serial/Makefile +++ b/drivers/tty/serial/Makefile @@ -87,6 +87,7 @@ obj-$(CONFIG_SERIAL_RDA) += rda-uart.o obj-$(CONFIG_SERIAL_MILBEAUT_USIO) += milbeaut_usio.o obj-$(CONFIG_SERIAL_SIFIVE) += sifive.o obj-$(CONFIG_SERIAL_LITEUART) += liteuart.o +obj-$(CONFIG_SERIAL_SUNPLUS) += sunplus-uart.o # GPIOLIB helpers for modem control lines obj-$(CONFIG_SERIAL_MCTRL_GPIO) += serial_mctrl_gpio.o diff --git a/drivers/tty/serial/sunplus-uart.c b/drivers/tty/serial/sunplus-uart.c new file mode 100644 index 0000000..bfc19e2 --- /dev/null +++ b/drivers/tty/serial/sunplus-uart.c @@ -0,0 +1,1591 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Sunplus SoC UART driver + * + * Author: Hammer Hsieh + * Tony Huang + * Wells Lu + * + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * UART_NR : Nunmer of UART channel, serial0, ... + * UART_DMARX_NR : Nunmer of UART RX DMA, serial10, ... + * UART_DMATX_NR : Nunmer of UART TX DMA, serial20, ... + * + */ +#define UART_NR 5 +#define UART_DMARX_NR 2 +#define UART_DMATX_NR 2 + +/* + * IS_UARTDMARX_ID(X) : if true , do rxdma init in probe + * IS_UARTDMATX_ID(X) : if true , do txdma init in probe + * + */ +#define ID_BASE_DMARX 10 +#define ID_BASE_DMATX 20 + +#define IS_UARTDMARX_ID(X) \ + (((X) >= (ID_BASE_DMARX)) && ((X) < (ID_BASE_DMARX + UART_DMARX_NR))) +#define IS_UARTDMATX_ID(X) \ + (((X) >= (ID_BASE_DMATX)) && ((X) < (ID_BASE_DMATX + UART_DMATX_NR))) + +struct sunplus_uart_port { + char name[16]; + struct uart_port uport; + struct sunplus_dma_info *uartdma_rx; + struct sunplus_dma_info *uartdma_tx; + struct clk *clk; + struct reset_control *rstc; + unsigned int pllsys_rate; + struct gpio_desc *rts_gpio; + struct hrtimer rts_check_tx_empty; + struct hrtimer rts_delay_before_send; + struct hrtimer rts_delay_after_send; +}; +struct sunplus_uart_port sunplus_uart_ports[UART_NR]; +static struct uart_driver sunplus_uart_driver; + +struct sunplus_dma_info { + void __iomem *membase; + void __iomem *gdma_membase; + unsigned long addr_phy; + int irq; + int which_uart; + struct sunplus_uart_port *binding_port; + void *buf_va; + dma_addr_t dma_handle; +}; +static struct sunplus_dma_info + sunplus_uartdma[UART_DMARX_NR + UART_DMATX_NR]; + +static inline struct sunplus_uart_port *to_sunplus_uart(struct uart_port *uport) +{ + return container_of(uport, struct sunplus_uart_port, uport); +} + +static inline void sp_uart_put_char(struct uart_port *port, unsigned int ch) +{ + struct sunplus_uart_port *sp_port = to_sunplus_uart(port); + struct sunplus_dma_info *tx_dma = sp_port->uartdma_tx; + u32 addr_sw, addr_start; + u32 offset_sw; + u8 *byte_ptr; + + if (!tx_dma) { + writel(ch, port->membase + SP_UART_DATA); + } else { + addr_sw = readl(tx_dma->membase + SP_UART_TXDMA_WR_ADR); + addr_start = readl(tx_dma->membase + SP_UART_TXDMA_START_ADDR); + offset_sw = addr_sw - addr_start; + byte_ptr = (u8 *)(tx_dma->buf_va + offset_sw); + *byte_ptr = (u8)(ch); + if (offset_sw == (PAGE_SIZE - 1)) + writel((u32)(tx_dma->dma_handle), + tx_dma->membase + SP_UART_TXDMA_WR_ADR); + else + writel((addr_sw + 1), + tx_dma->membase + SP_UART_TXDMA_WR_ADR); + } +} + +static inline u32 sp_uart_line_status_tx_buf_not_full(struct uart_port *port) +{ + struct sunplus_uart_port *sp_port = to_sunplus_uart(port); + struct sunplus_dma_info *tx_dma = sp_port->uartdma_tx; + u32 addr_sw, addr_hw; + + if (tx_dma) { + if (readl(tx_dma->membase + SP_UART_TXDMA_STATUS) & TXDMA_BUF_FULL) + return 0; + + addr_sw = readl(tx_dma->membase + SP_UART_TXDMA_WR_ADR); + addr_hw = readl(tx_dma->membase + SP_UART_TXDMA_RD_ADR); + if (addr_sw >= addr_hw) + return (PAGE_SIZE - (addr_sw - addr_hw)); + else + return (addr_hw - addr_sw); + + } else { + if (readl(port->membase + SP_UART_LSR) & SP_UART_LSR_TX) + return 1; + else + return 0; + } +} + +/* + * Note: + * When (uart0_as_console == 0), please make sure: + * There is no "console=ttyS0,115200", "earlyprintk", ... in kernel command line. + * In /etc/inittab, there is no something like "ttyS0::respawn:/bin/sh" + */ +unsigned int uart0_as_console = ~0; +unsigned int uart_enable_status = ~0; + +static struct sunplus_dma_info *sunplus_uartdma_rx_binding(int id) +{ + int i; + + for (i = 0; i < UART_DMARX_NR; i++) { + if ((sunplus_uartdma[i].which_uart == id) && (sunplus_uartdma[i].membase)) { + sunplus_uartdma[i].binding_port = &sunplus_uart_ports[id]; + return &sunplus_uartdma[i]; + } + } + return NULL; +} + +static struct sunplus_dma_info *sunplus_uartdma_tx_binding(int id) +{ + int i; + + for (i = UART_DMARX_NR; i < (UART_DMARX_NR + UART_DMATX_NR); i++) { + if ((sunplus_uartdma[i].which_uart == id) && (sunplus_uartdma[i].membase)) { + sunplus_uartdma[i].binding_port = &sunplus_uart_ports[id]; + return &sunplus_uartdma[i]; + } + } + return NULL; +} + +static inline void wait_for_xmitr(struct uart_port *port) +{ + while (1) { + if (sp_uart_line_status_tx_buf_not_full(port)) + break; + } +} + +static unsigned int sunplus_tx_empty(struct uart_port *port) +{ + struct sunplus_uart_port *sp_port = to_sunplus_uart(port); + struct sunplus_dma_info *tx_dma = sp_port->uartdma_tx; + + if (tx_dma) { + if (readl(tx_dma->membase + SP_UART_TXDMA_STATUS) & TXDMA_BUF_EMPTY) + return TIOCSER_TEMT; + else + return 0; + } else { + return ((readl(port->membase + SP_UART_LSR) & SP_UART_LSR_TXE) + ? TIOCSER_TEMT : 0); + } +} + +static void sunplus_set_mctrl(struct uart_port *port, unsigned int mctrl) +{ + struct sunplus_uart_port *sp_port = to_sunplus_uart(port); + unsigned int mcr = readl(port->membase + SP_UART_MCR); + ktime_t ktime; + + if (mctrl & TIOCM_DTR) + mcr |= SP_UART_MCR_DTS; + else + mcr &= ~SP_UART_MCR_DTS; + + if (mctrl & TIOCM_RTS) { + if ((sp_port->uport.rs485.flags & SER_RS485_ENABLED) + && (sp_port->uport.rs485.flags & SER_RS485_RTS_ON_SEND)) + mcr &= ~SP_UART_MCR_RTS; /* RTS invert */ + else + mcr |= SP_UART_MCR_RTS; + } else { + /* data transfer ended */ + if (sp_port->uport.rs485.flags & SER_RS485_ENABLED) + return; + + mcr &= ~SP_UART_MCR_RTS; + } + + if (mctrl & TIOCM_CAR) + mcr |= SP_UART_MCR_DCD; + else + mcr &= ~SP_UART_MCR_DCD; + + if (mctrl & TIOCM_RI) + mcr |= SP_UART_MCR_RI; + else + mcr &= ~SP_UART_MCR_RI; + + if (mctrl & TIOCM_LOOP) + mcr |= SP_UART_MCR_LB; + else + mcr &= ~SP_UART_MCR_LB; + + writel(mcr, port->membase + SP_UART_MCR); + + if (sp_port->uport.rs485.flags & SER_RS485_ENABLED) { + mcr = readl(port->membase + SP_UART_MCR); + if (mctrl & TIOCM_RTS) { + if (((mcr & SP_UART_MCR_RTS) + && (sp_port->uport.rs485.flags & SER_RS485_RTS_AFTER_SEND)) + || (sp_port->uport.rs485.flags & SER_RS485_RTS_ON_SEND)) { + if (!IS_ERR(sp_port->rts_gpio)) + gpiod_set_value(sp_port->rts_gpio, 1); + dev_dbg(port->dev, "%s set rts_gpio=1\n", port->name); + if (sp_port->uport.rs485.delay_rts_before_send == 0) { + ktime = ktime_set(0, 500000); /* 500us */ + hrtimer_start(&sp_port->rts_check_tx_empty, + ktime, HRTIMER_MODE_REL); + } + } + } + } +} + +static unsigned int sunplus_get_mctrl(struct uart_port *port) +{ + unsigned int ret, mcr; + + mcr = readl(port->membase + SP_UART_MCR); + + if (mcr & SP_UART_MCR_DTS) + ret |= TIOCM_DTR; + + if (mcr & SP_UART_MCR_RTS) + ret |= TIOCM_RTS; + + if (mcr & SP_UART_MCR_DCD) + ret |= TIOCM_CAR; + + if (mcr & SP_UART_MCR_RI) + ret |= TIOCM_RI; + + if (mcr & SP_UART_MCR_LB) + ret |= TIOCM_LOOP; + + if (mcr & SP_UART_MCR_AC) + ret |= TIOCM_CTS; + + return ret; +} + +static void sunplus_stop_tx(struct uart_port *port) +{ + unsigned int isc; + + isc = readl(port->membase + SP_UART_ISC); + isc &= ~SP_UART_ISC_TXM; + writel(isc, port->membase + SP_UART_ISC); +} + +static inline void __start_tx(struct uart_port *port) +{ + unsigned int isc; + + isc = readl(port->membase + SP_UART_ISC); + isc |= SP_UART_ISC_TXM; + writel(isc, port->membase + SP_UART_ISC); +} + +static void sunplus_start_tx(struct uart_port *port) +{ + struct sunplus_uart_port *sp_port = to_sunplus_uart(port); + ktime_t ktime; + int val; + + if (sp_port->uport.rs485.flags & SER_RS485_ENABLED) { + val = (sp_port->uport.rs485.flags & SER_RS485_RTS_ON_SEND ? 1 : 0); + if (!IS_ERR(sp_port->rts_gpio)) + gpiod_set_value(sp_port->rts_gpio, val); + + dev_dbg(port->dev, "%s set rts_gpio=%d\n", sp_port->uport.name, val); + if (sp_port->uport.rs485.delay_rts_before_send > 0) { + long nsec = sp_port->uport.rs485.delay_rts_before_send * 1000000; + + ktime = ktime_set(0, nsec); + hrtimer_start(&sp_port->rts_delay_before_send, ktime, HRTIMER_MODE_REL); + return; + } + } + __start_tx(port); +} + +static void sunplus_stop_rx(struct uart_port *port) +{ + unsigned int isc; + + isc = readl(port->membase + SP_UART_ISC); + isc &= ~SP_UART_ISC_RXM; + writel(isc, port->membase + SP_UART_ISC); +} + +static void sunplus_enable_ms(struct uart_port *port) +{ + /* Do nothing */ +} + +static void sunplus_break_ctl(struct uart_port *port, int ctl) +{ + unsigned long flags; + unsigned int lcr; + + spin_lock_irqsave(&port->lock, flags); + + lcr = readl(port->membase + SP_UART_LCR); + + if (ctl != 0) + lcr |= SP_UART_LCR_BC; /* start break */ + else + lcr &= ~SP_UART_LCR_BC; /* stop break */ + + writel(lcr, port->membase + SP_UART_LCR); + + spin_unlock_irqrestore(&port->lock, flags); +} + +static void transmit_chars(struct uart_port *port) +{ + struct sunplus_uart_port *sp_port = to_sunplus_uart(port); + struct sunplus_dma_info *tx_dma = sp_port->uartdma_tx; + u32 tx_buf_available; + u32 addr_sw, addr_start; + u32 offset_sw; + u8 *byte_ptr; + struct circ_buf *xmit = &port->state->xmit; + + if (port->x_char) { + sp_uart_put_char(port, port->x_char); + port->icount.tx++; + port->x_char = 0; + return; + } + + if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { + sunplus_stop_tx(port); + return; + } + + if (tx_dma) { + addr_sw = readl(tx_dma->membase + SP_UART_TXDMA_WR_ADR); + addr_start = readl(tx_dma->membase + SP_UART_TXDMA_START_ADDR); + offset_sw = addr_sw - addr_start; + byte_ptr = (u8 *)(tx_dma->buf_va + offset_sw); + tx_buf_available = sp_uart_line_status_tx_buf_not_full(port); + while (tx_buf_available) { + *byte_ptr = xmit->buf[xmit->tail]; + xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); + port->icount.tx++; + + byte_ptr++; + addr_sw++; + offset_sw++; + tx_buf_available--; + if (offset_sw == PAGE_SIZE) { + offset_sw = 0; + addr_sw = (u32)(tx_dma->dma_handle); + byte_ptr = (u8 *)(tx_dma->buf_va); + } + + if (uart_circ_empty(xmit)) + break; + } + writel(addr_sw, tx_dma->membase + SP_UART_TXDMA_WR_ADR); + } else { + do { + sp_uart_put_char(port, xmit->buf[xmit->tail]); + xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); + port->icount.tx++; + + if (uart_circ_empty(xmit)) + break; + } while (sp_uart_line_status_tx_buf_not_full(port)); + } + + if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) + uart_write_wakeup(port); + + if (uart_circ_empty(xmit)) + sunplus_stop_tx(port); +} + +/* called by ISR */ +static void receive_chars(struct uart_port *port) +{ + struct tty_struct *tty = port->state->port.tty; + unsigned int lsr = readl(port->membase + SP_UART_LSR); + unsigned int ch, flag; + + do { + ch = readl(port->membase + SP_UART_DATA); + + flag = TTY_NORMAL; + port->icount.rx++; + + if (unlikely(lsr & SP_UART_LSR_BRK_ERROR_BITS)) { + if (port->cons == NULL) + dev_err(port->dev, "UART%d, SP_UART_LSR_BRK_ERROR_BITS, lsr = 0x%08X\n", + port->line, lsr); + + if (lsr & SP_UART_LSR_BC) { + lsr &= ~(SP_UART_LSR_FE | SP_UART_LSR_PE); + port->icount.brk++; + if (uart_handle_break(port)) + goto ignore_char; + } else if (lsr & SP_UART_LSR_PE) { + if (port->cons == NULL) + dev_err(port->dev, "UART%d, SP_UART_LSR_PE\n", port->line); + port->icount.parity++; + } else if (lsr & SP_UART_LSR_FE) { + if (port->cons == NULL) + dev_err(port->dev, "UART%d, SP_UART_LSR_FE\n", port->line); + port->icount.frame++; + } + if (lsr & SP_UART_LSR_OE) { + if (port->cons == NULL) + dev_err(port->dev, "UART%d, SP_UART_LSR_OE\n", port->line); + port->icount.overrun++; + } + + /* + * Mask off conditions which should be ignored. + */ + + /* lsr &= port->read_status_mask; */ + + if (lsr & SP_UART_LSR_BC) + flag = TTY_BREAK; + else if (lsr & SP_UART_LSR_PE) + flag = TTY_PARITY; + else if (lsr & SP_UART_LSR_FE) + flag = TTY_FRAME; + } + + if (port->ignore_status_mask & SP_UART_CREAD_DISABLED) + goto ignore_char; + + if (uart_handle_sysrq_char(port, ch)) + goto ignore_char; + + uart_insert_char(port, lsr, SP_UART_LSR_OE, ch, flag); + +ignore_char: + lsr = readl(port->membase + SP_UART_LSR); + } while (lsr & SP_UART_LSR_RX); + + if (tty) { + spin_unlock(&port->lock); + tty_flip_buffer_push(tty->port); + spin_lock(&port->lock); + } +} + +static irqreturn_t sunplus_uart_irq(int irq, void *args) +{ + struct uart_port *port = (struct uart_port *)args; + unsigned long flags; + + spin_lock_irqsave(&port->lock, flags); + + if (readl(port->membase + SP_UART_ISC) & SP_UART_ISC_RX) + receive_chars(port); + + if (readl(port->membase + SP_UART_ISC) & SP_UART_ISC_TX) + transmit_chars(port); + + spin_unlock_irqrestore(&port->lock, flags); + + return IRQ_HANDLED; +} + +/* called by ISR */ +static void receive_chars_rxdma(struct uart_port *port) +{ + struct sunplus_uart_port *sp_port = to_sunplus_uart(port); + struct sunplus_dma_info *rx_dma = sp_port->uartdma_rx; + struct tty_struct *tty = port->state->port.tty; + u32 offset_sw, offset_hw, rx_size, dma_start; + u8 *sw_ptr, *buf_end_ptr, *u8_ptr; + u32 icount_rx; + u32 tmp_u32, value; + u8 tmp_buf[32]; + int i; + + dma_start = readl(rx_dma->membase + SP_UART_RXDMA_START_ADDR); + offset_sw = readl(rx_dma->membase + SP_UART_RXDMA_RD_ADR) - dma_start; + offset_hw = readl(rx_dma->membase + SP_UART_RXDMA_WR_ADR) - dma_start; + + if (offset_hw >= offset_sw) + rx_size = offset_hw - offset_sw; + else + rx_size = offset_hw + PAGE_SIZE - offset_sw; + + sw_ptr = (u8 *)(rx_dma->buf_va + offset_sw); + buf_end_ptr = (u8 *)(rx_dma->buf_va + PAGE_SIZE); + + /* + * Retrieve all data in ISR. + * The max. received size is (buffer_size - threshold_size) + * = (rxdma_length_thr[31:16] - rxdma_length_thr[15:0]) + * In order to limit the execution time in this ISR: + * => Increase rxdma_length_thr[15:0] to shorten each ISR execution time. + * => Don't need to set a small threshold_size, + * and split a long ISR into several shorter ISRs. + */ + icount_rx = 0; + while (rx_size > icount_rx) { + /* 32-byte aligned */ + if (!(((unsigned long)(sw_ptr)) & (32 - 1)) + && ((rx_size - icount_rx) >= 32)) { + /* + * Copy 32 bytes data from non cache area to cache area. + * => It should use less DRAM controller's read command. + */ + memcpy(tmp_buf, sw_ptr, 32); + u8_ptr = (u8 *)(tmp_buf); + for (i = 0; i < 32; i++) { + port->icount.rx++; + uart_insert_char(port, 0, SP_UART_LSR_OE, + (unsigned int)(*u8_ptr), TTY_NORMAL); + u8_ptr++; + } + sw_ptr += 32; + icount_rx += 32; + } else { + port->icount.rx++; + uart_insert_char(port, 0, SP_UART_LSR_OE, + (unsigned int)(*sw_ptr), TTY_NORMAL); + sw_ptr++; + icount_rx++; + } + if (sw_ptr >= buf_end_ptr) + sw_ptr = (u8 *)(rx_dma->buf_va); + } + + tmp_u32 = readl(rx_dma->membase + SP_UART_RXDMA_RD_ADR) + rx_size; + + if (tmp_u32 <= readl(rx_dma->membase + SP_UART_RXDMA_END_ADDR)) + writel(tmp_u32, rx_dma->membase + SP_UART_RXDMA_RD_ADR); + else + writel((tmp_u32 - PAGE_SIZE), rx_dma->membase + SP_UART_RXDMA_RD_ADR); + + spin_unlock(&port->lock); + tty_flip_buffer_push(tty->port); + spin_lock(&port->lock); + + value = readl(rx_dma->membase + SP_UART_RXDMA_ENABLE_SEL); + value |= DMA_INT; + writel(value, rx_dma->membase + SP_UART_RXDMA_ENABLE_SEL); + + value = readl(rx_dma->membase + SP_UART_RXDMA_ENABLE_SEL); + value |= DMA_GO; + writel(value, rx_dma->membase + SP_UART_RXDMA_ENABLE_SEL); + +} + +static irqreturn_t sunplus_uart_rxdma_irq(int irq, void *args) +{ + struct uart_port *port = (struct uart_port *)args; + unsigned long flags; + + spin_lock_irqsave(&port->lock, flags); + + receive_chars_rxdma(port); + + spin_unlock_irqrestore(&port->lock, flags); + + return IRQ_HANDLED; +} + +static int sunplus_startup(struct uart_port *port) +{ + struct sunplus_uart_port *sp_port = to_sunplus_uart(port); + struct sunplus_dma_info *rx_dma, *tx_dma; + u32 timeout, interrupt_en; + unsigned int ch, value; + int ret; + + if (sp_port->uport.rs485.flags & SER_RS485_ENABLED) + hrtimer_cancel(&sp_port->rts_delay_after_send); + +#ifdef CONFIG_PM_RUNTIME_UART + if (port->line > 0) { + ret = pm_runtime_get_sync(port->dev); + if (ret < 0) + goto out; + } +#endif + + ret = request_irq(port->irq, sunplus_uart_irq, 0, sp_port->name, port); + if (ret) + return ret; + + rx_dma = sp_port->uartdma_rx; + + if (rx_dma) { + if (rx_dma->buf_va == NULL) { + /* Drop data in Rx FIFO (PIO mode) */ + while (readl(port->membase + SP_UART_LSR) & SP_UART_LSR_RX) + ch = readl(port->membase + SP_UART_DATA); + + rx_dma->buf_va = + dma_alloc_coherent(port->dev, PAGE_SIZE, + &(rx_dma->dma_handle), GFP_KERNEL); + if (rx_dma->buf_va == NULL) { + dev_err(port->dev, "Can't allocation buffer for %s\n", + sp_port->name); + ret = -ENOMEM; + goto error_01; + } + + writel((u32)(rx_dma->dma_handle), + rx_dma->membase + SP_UART_RXDMA_START_ADDR); + writel((u32)(rx_dma->dma_handle), + rx_dma->membase + SP_UART_RXDMA_RD_ADR); + + /* Switch clock source when setting baud rate */ + timeout = (sp_port->pllsys_rate / 2) / 1000; /* 1 msec */ + writel(timeout, rx_dma->membase + SP_UART_RXDMA_TIMEOUT_SET); + + /* + * When there are only rxdma_length_thr[15:0] bytes + * of free buffer => Trigger interrupt + */ + writel((PAGE_SIZE << 16) | (PAGE_SIZE - (PAGE_SIZE >> 3)), + rx_dma->membase + SP_UART_RXDMA_LENGTH_THR); + + value = readl(rx_dma->membase + SP_UART_RXDMA_ENABLE_SEL); + value &= ~DMA_SEL_UARTX_MASK; + value |= (DMA_INIT | (rx_dma->which_uart << DMA_SEL_UARTX_SHIFT)); + writel(value, rx_dma->membase + SP_UART_RXDMA_ENABLE_SEL); + + value = readl(rx_dma->membase + SP_UART_RXDMA_ENABLE_SEL); + value &= ~DMA_INIT; + writel(value, rx_dma->membase + SP_UART_RXDMA_ENABLE_SEL); + + value = readl(rx_dma->membase + SP_UART_RXDMA_ENABLE_SEL); + value |= (DMA_SW_RST_B | DMA_AUTO_ENABLE | DMA_TIMEOUT_INT_EN | DMA_ENABLE); + writel(value, rx_dma->membase + SP_UART_RXDMA_ENABLE_SEL); + + value = readl(rx_dma->membase + SP_UART_RXDMA_ENABLE_SEL); + value |= DMA_GO; + writel(value, rx_dma->membase + SP_UART_RXDMA_ENABLE_SEL); + } + + ret = request_irq(rx_dma->irq, sunplus_uart_rxdma_irq, 0, "UARTDMA_RX", port); + if (ret) { + dma_free_coherent(port->dev, PAGE_SIZE, + rx_dma->buf_va, rx_dma->dma_handle); + goto error_00; + } + } + + tx_dma = sp_port->uartdma_tx; + if (tx_dma) { + if (tx_dma->buf_va == NULL) { + tx_dma->buf_va = + dma_alloc_coherent(port->dev, PAGE_SIZE, + &(tx_dma->dma_handle), GFP_KERNEL); + if (tx_dma->buf_va == NULL) { + dev_err(port->dev, "Can't allocation buffer for %s\n", + sp_port->name); + ret = -ENOMEM; + goto error_01; + } + + /* + * set 1ms , set wr_adr , set start_addr/end_addr , + * set bind to uart# , set int enable , + * set txdma enable (Use ring buffer for UART's Tx) + */ + writel((sp_port->pllsys_rate / 1000), + tx_dma->membase + SP_UART_TXDMA_TMR_UNIT); + writel((u32)(tx_dma->dma_handle), tx_dma->membase + SP_UART_TXDMA_WR_ADR); + writel((u32)(tx_dma->dma_handle), + tx_dma->membase + SP_UART_TXDMA_START_ADDR); + writel(((u32)(tx_dma->dma_handle) + PAGE_SIZE - 1), + tx_dma->membase + SP_UART_TXDMA_END_ADDR); + writel(tx_dma->which_uart, tx_dma->membase + SP_UART_TXDMA_SEL); + writel(0x41, tx_dma->gdma_membase + SP_UART_TXGDMA_INT_EN); + writel(0x00000005, tx_dma->membase + SP_UART_TXDMA_ENABLE); + } + } + + /* + * don't need to use spin_lock_irqsave() because interrupts + * are globally disabled + */ + spin_lock_irq(&port->lock); + + /* SP_UART_ISC_TXM is enabled in .start_tx() */ + interrupt_en = 0; + if (rx_dma == NULL) + interrupt_en |= SP_UART_ISC_RXM; + + writel(interrupt_en, port->membase + SP_UART_ISC); + + spin_unlock_irq(&port->lock); + +#ifdef CONFIG_PM_RUNTIME_UART + if (port->line > 0) + pm_runtime_put(port->dev); + + return 0; + +out: + if (port->line > 0) { + pm_runtime_mark_last_busy(port->dev); + pm_runtime_put_autosuspend(port->dev); + } +#endif + return 0; + +error_01: + if (rx_dma) { + dma_free_coherent(port->dev, PAGE_SIZE, + rx_dma->buf_va, rx_dma->dma_handle); + free_irq(rx_dma->irq, port); + } +error_00: + free_irq(port->irq, port); + return ret; +} + +static void sunplus_shutdown(struct uart_port *port) +{ + struct sunplus_uart_port *sp_port = to_sunplus_uart(port); + struct sunplus_dma_info *rx_dma; + unsigned int mcr, value; + unsigned long flags; + + spin_lock_irqsave(&port->lock, flags); + writel(0, port->membase + SP_UART_ISC); + spin_unlock_irqrestore(&port->lock, flags); + + free_irq(port->irq, port); + + rx_dma = sp_port->uartdma_rx; + if (rx_dma) { + /* Drop whatever is still in buffer */ + value = readl(rx_dma->membase + SP_UART_RXDMA_WR_ADR); + writel(value, rx_dma->membase + SP_UART_RXDMA_RD_ADR); + + free_irq(rx_dma->irq, port); + } + + /* Disable flow control of Tx, so that queued data can be sent out + * There is no way for s/w to let h/w abort in the middle of + * transaction. + * Don't reset module except it's in idle state. Otherwise, it might + * cause bus to hang. + */ + mcr = readl(port->membase + SP_UART_MCR); + mcr &= ~SP_UART_MCR_AC; + writel(mcr, port->membase + SP_UART_MCR); + +} + +static void sunplus_set_termios(struct uart_port *port, + struct ktermios *termios, struct ktermios *oldtermios) +{ + u32 clk, ext, div, div_l, div_h, baud; + u32 lcr, mcr; + unsigned long flags; + + clk = port->uartclk; + + baud = uart_get_baud_rate(port, termios, oldtermios, 0, port->uartclk / 16); + + /* + * Send all data in Tx FIFO before changing clock source, + * it should be UART0 only + */ + while (!(readl(port->membase + SP_UART_LSR) & SP_UART_LSR_TXE)) + ; + + clk += baud >> 1; + div = clk / baud; + ext = div & 0x0F; + div = (div >> 4) - 1; + div_l = (div & 0xFF) | (ext << 12); + div_h = div >> 8; + + switch (termios->c_cflag & CSIZE) { + case CS5: + lcr = SP_UART_LCR_WL5; + break; + case CS6: + lcr = SP_UART_LCR_WL6; + break; + case CS7: + lcr = SP_UART_LCR_WL7; + break; + default: /* CS8 */ + lcr = SP_UART_LCR_WL8; + break; + } + + if (termios->c_cflag & CSTOPB) + lcr |= SP_UART_LCR_ST; + + if (termios->c_cflag & PARENB) { + lcr |= SP_UART_LCR_PE; + + if (!(termios->c_cflag & PARODD)) + lcr |= SP_UART_LCR_PR; + } + + spin_lock_irqsave(&port->lock, flags); + + uart_update_timeout(port, termios->c_cflag, baud); + + port->read_status_mask = 0; + if (termios->c_iflag & INPCK) + port->read_status_mask |= SP_UART_LSR_PE | SP_UART_LSR_FE; + + if (termios->c_iflag & (BRKINT | PARMRK)) + port->read_status_mask |= SP_UART_LSR_BC; + + /* + * Characters to ignore + */ + port->ignore_status_mask = 0; + if (termios->c_iflag & IGNPAR) + port->ignore_status_mask |= SP_UART_LSR_FE | SP_UART_LSR_PE; + + if (termios->c_iflag & IGNBRK) { + port->ignore_status_mask |= SP_UART_LSR_BC; + + if (termios->c_iflag & IGNPAR) + port->ignore_status_mask |= SP_UART_LSR_OE; + } + + /* + * Ignore all characters if CREAD is not set. + */ + if ((termios->c_cflag & CREAD) == 0) { + port->ignore_status_mask |= SP_UART_CREAD_DISABLED; + /* flush rx data FIFO */ + writel(0, port->membase + SP_UART_RX_RESIDUE); + } + + mcr = readl(port->membase + SP_UART_MCR); + + if (termios->c_cflag & CRTSCTS) + mcr |= (SP_UART_MCR_AC | SP_UART_MCR_AR); + else + mcr &= ~(SP_UART_MCR_AC | SP_UART_MCR_AR); + + writel(mcr, port->membase + SP_UART_MCR); + + /* do not set these in emulation */ + writel(div_h, port->membase + SP_UART_DIV_H); + writel(div_l, port->membase + SP_UART_DIV_L); + writel(lcr, port->membase + SP_UART_LCR); + + spin_unlock_irqrestore(&port->lock, flags); +} + +static void sunplus_set_ldisc(struct uart_port *port, + struct ktermios *termios) +{ + int new = termios->c_line; + + if (new == N_PPS) { + port->flags |= UPF_HARDPPS_CD; + sunplus_enable_ms(port); + } else { + port->flags &= ~UPF_HARDPPS_CD; + } +} + +static const char *sunplus_type(struct uart_port *port) +{ + struct sunplus_uart_port *sp_port = to_sunplus_uart(port); + + return sp_port->name; +} + +static void sunplus_release_port(struct uart_port *port) +{ +} + +static int sunplus_request_port(struct uart_port *port) +{ + return 0; +} + +static void sunplus_config_port(struct uart_port *port, int type) +{ + if (type & UART_CONFIG_TYPE) { + port->type = PORT_SUNPLUS; + sunplus_request_port(port); + } +} + +static int sunplus_verify_port(struct uart_port *port, struct serial_struct *serial) +{ + return -EINVAL; +} + +#ifdef CONFIG_CONSOLE_POLL +static int sunplus_poll_init(struct uart_port *port) +{ + return 0; +} + +static void sunplus_poll_put_char(struct uart_port *port, unsigned char data) +{ + wait_for_xmitr(port); + sp_uart_put_char(port, data); +} + +static int sunplus_poll_get_char(struct uart_port *port) +{ + unsigned int lsr; + + do { + lsr = readl(port->membase + SP_UART_LSR); + } while (!(lsr & SP_UART_LSR_RX)); + + return readl(port->membase + SP_UART_DATA); +} +#endif /* CONFIG_CONSOLE_POLL */ + +static enum hrtimer_restart sp_rts_check_tx_empty(struct hrtimer *t) +{ + struct sunplus_uart_port *sp_port; + unsigned int mcr, lsr; + unsigned char val; + ktime_t ktime; + unsigned long nsec; + + sp_port = container_of(t, struct sunplus_uart_port, rts_check_tx_empty); + mcr = readl(sp_port->uport.membase + SP_UART_MCR); + lsr = readl(sp_port->uport.membase + SP_UART_LSR); + // TX is NOT empty + if (!(lsr & SP_UART_LSR_TXE)) + return HRTIMER_RESTART; + // TX is empty + nsec = sp_port->uport.rs485.delay_rts_after_send * 1000000; + // schedule RTS set + if (nsec > 0) { + ktime = ktime_set(0, nsec); + hrtimer_start(&sp_port->rts_delay_after_send, ktime, HRTIMER_MODE_REL); + return HRTIMER_NORESTART; + } + // immediately set RTS + val = (sp_port->uport.rs485.flags & SER_RS485_RTS_AFTER_SEND ? 1 : 0); + if (sp_port->uport.rs485.flags & SER_RS485_RTS_ON_SEND) + mcr |= SP_UART_MCR_RTS; + else + mcr &= ~SP_UART_MCR_RTS; + if (sp_port->uport.rs485.flags & SER_RS485_ENABLED && !IS_ERR(sp_port->rts_gpio)) { + gpiod_set_value(sp_port->rts_gpio, val); + dev_dbg(sp_port->uport.dev, "%s set rts_gpio=%d\n", + sp_port->uport.name, val); + } else + writel(mcr, sp_port->uport.membase + SP_UART_MCR); + + return HRTIMER_NORESTART; +} + +static enum hrtimer_restart sp_rts_delay_before_send(struct hrtimer *t) +{ + struct sunplus_uart_port *sp_port; + ktime_t ktime; + + sp_port = container_of(t, struct sunplus_uart_port, rts_delay_before_send); + ktime = ktime_set(0, 500000); //500us + hrtimer_start(&sp_port->rts_check_tx_empty, ktime, HRTIMER_MODE_REL); + __start_tx(&sp_port->uport); + return HRTIMER_NORESTART; +} + +static enum hrtimer_restart sp_rts_delay_after_send(struct hrtimer *t) +{ + struct sunplus_uart_port *sp_port; + unsigned char val; + unsigned int mcr; + + sp_port = container_of(t, struct sunplus_uart_port, rts_delay_after_send); + mcr = readl(sp_port->uport.membase + SP_UART_MCR); + + val = (sp_port->uport.rs485.flags & SER_RS485_RTS_AFTER_SEND ? 1 : 0); + if (sp_port->uport.rs485.flags & SER_RS485_RTS_ON_SEND) + mcr |= SP_UART_MCR_RTS; + else + mcr &= ~SP_UART_MCR_RTS; + if (sp_port->uport.rs485.flags & SER_RS485_ENABLED && !IS_ERR(sp_port->rts_gpio)) { + gpiod_set_value(sp_port->rts_gpio, val); + dev_dbg(sp_port->uport.dev, "%s set rts_gpio=%d\n", + sp_port->uport.name, val); + } else + writel(mcr, sp_port->uport.membase + SP_UART_MCR); + + return HRTIMER_NORESTART; +} + +static int sunplus_uart_rs485_on(struct uart_port *port) +{ + struct sunplus_uart_port *sp_port = to_sunplus_uart(port); + + if (IS_ERR(sp_port->rts_gpio)) { + dev_err(port->dev, "%s No valid rts_gpio, disabling 485\n", + port->name); + port->rs485.flags &= ~SER_RS485_ENABLED; + return (-EINVAL); + } + + if (!sp_port->rts_check_tx_empty.function) { + hrtimer_init(&(sp_port->rts_check_tx_empty), CLOCK_MONOTONIC, HRTIMER_MODE_REL); + sp_port->rts_check_tx_empty.function = sp_rts_check_tx_empty; + } + if (!sp_port->rts_delay_before_send.function) { + hrtimer_init(&(sp_port->rts_delay_before_send), CLOCK_MONOTONIC, HRTIMER_MODE_REL); + sp_port->rts_delay_before_send.function = sp_rts_delay_before_send; + } + if (!sp_port->rts_delay_after_send.function) { + hrtimer_init(&(sp_port->rts_delay_after_send), CLOCK_MONOTONIC, HRTIMER_MODE_REL); + sp_port->rts_delay_after_send.function = sp_rts_delay_after_send; + } + return (0); +} + +static int sunplus_uart_rs485_off(struct uart_port *port) +{ + struct sunplus_uart_port *sp_port = to_sunplus_uart(port); + + port->rs485.flags &= ~SER_RS485_ENABLED; + if (sp_port->rts_check_tx_empty.function) { + hrtimer_cancel(&sp_port->rts_check_tx_empty); + sp_port->rts_check_tx_empty.function = NULL; + } + if (sp_port->rts_delay_before_send.function) { + hrtimer_cancel(&sp_port->rts_delay_before_send); + sp_port->rts_delay_before_send.function = NULL; + } + if (sp_port->rts_delay_after_send.function) { + hrtimer_cancel(&sp_port->rts_delay_after_send); + sp_port->rts_delay_after_send.function = NULL; + } + return (0); +} + +static int sunplus_uart_config_rs485(struct uart_port *port, + struct serial_rs485 *rs485) +{ + struct sunplus_uart_port *sp_port = to_sunplus_uart(port); + int val; + + if (IS_ERR(sp_port->rts_gpio)) { + dev_err(port->dev, "%s No valid rts_gpio - skipping rs485\n", + port->name); + port->rs485.flags &= ~SER_RS485_ENABLED; + return (-EINVAL); + } + +#ifdef CONFIG_PM_RUNTIME_UART + pm_runtime_get_sync(sp_port->dev); +#endif + + rs485->delay_rts_before_send = + min(rs485->delay_rts_before_send, 10000U); + rs485->delay_rts_after_send = + min(rs485->delay_rts_after_send, 10000U); + + if (rs485->flags & SER_RS485_ENABLED) { + sunplus_uart_rs485_on(port); + val = (rs485->flags & SER_RS485_RTS_AFTER_SEND ? 1 : 0); + gpiod_set_value(sp_port->rts_gpio, val); + } else + sunplus_uart_rs485_off(port); + + port->rs485 = *rs485; + +#ifdef CONFIG_PM_RUNTIME_UART + pm_runtime_mark_last_busy(sp_port->dev); + pm_runtime_put_autosuspend(sp_port->dev); +#endif + return (0); +} + +static const struct uart_ops sunplus_uart_ops = { + .tx_empty = sunplus_tx_empty, + .set_mctrl = sunplus_set_mctrl, + .get_mctrl = sunplus_get_mctrl, + .stop_tx = sunplus_stop_tx, + .start_tx = sunplus_start_tx, + .stop_rx = sunplus_stop_rx, + .enable_ms = sunplus_enable_ms, + .break_ctl = sunplus_break_ctl, + .startup = sunplus_startup, + .shutdown = sunplus_shutdown, + .set_termios = sunplus_set_termios, + .set_ldisc = sunplus_set_ldisc, + .type = sunplus_type, + .release_port = sunplus_release_port, + .request_port = sunplus_request_port, + .config_port = sunplus_config_port, + .verify_port = sunplus_verify_port, +#ifdef CONFIG_CONSOLE_POLL + .poll_init = sunplus_poll_init, + .poll_put_char = sunplus_poll_put_char, + .poll_get_char = sunplus_poll_get_char, +#endif /* CONFIG_CONSOLE_POLL */ +}; + +#ifdef CONFIG_SERIAL_SUNPLUS_CONSOLE +static void sunplus_uart_console_putchar(struct uart_port *port, int ch) +{ + wait_for_xmitr(port); + sp_uart_put_char(port, ch); +} + +static void sunplus_console_write(struct console *co, + const char *s, unsigned int count) +{ + unsigned long flags; + int locked = 1; + + local_irq_save(flags); + + if (sunplus_uart_ports[co->index].uport.sysrq) + locked = 0; + else if (oops_in_progress) + locked = spin_trylock(&sunplus_uart_ports[co->index].uport.lock); + else + spin_lock(&sunplus_uart_ports[co->index].uport.lock); + + uart_console_write(&sunplus_uart_ports[co->index].uport, + s, count, sunplus_uart_console_putchar); + + if (locked) + spin_unlock(&sunplus_uart_ports[co->index].uport.lock); + + local_irq_restore(flags); +} + +static int __init sunplus_console_setup(struct console *co, char *options) +{ + struct uart_port *port; + int baud = 115200; + int bits = 8; + int parity = 'n'; + int flow = 'n'; + + if ((co->index >= UART_NR) || (co->index < 0)) + return -EINVAL; + + port = &sunplus_uart_ports[co->index].uport; + + if (options) + uart_parse_options(options, &baud, &parity, &bits, &flow); + + return uart_set_options(port, co, baud, parity, bits, flow); +} + +static struct console sunplus_console = { + .name = "ttyS", + .write = sunplus_console_write, + .device = uart_console_device, + .setup = sunplus_console_setup, + .flags = CON_PRINTBUFFER, + .index = -1, + .data = &sunplus_uart_driver +}; +#endif + +static struct uart_driver sunplus_uart_driver = { + .owner = THIS_MODULE, + .driver_name = "Sunplus_UART", + .dev_name = "ttyS", + .major = TTY_MAJOR, + .minor = 64, + .nr = UART_NR, +#ifdef CONFIG_SERIAL_SUNPLUS_CONSOLE + .cons = &sunplus_console +#endif +}; + +static int sunplus_uart_probe(struct platform_device *pdev) +{ + struct resource *res_mem; + struct uart_port *port; + struct clk *clk, *pllsys; + unsigned int pllsys_rate; + int ret, irq; + int idx_offset, idx; + int idx_which_uart; + char peri_name[16]; + + if (pdev->dev.of_node) { + pdev->id = of_alias_get_id(pdev->dev.of_node, "serial"); + if (pdev->id < 0) + pdev->id = of_alias_get_id(pdev->dev.of_node, "uart"); + } + + idx_offset = -1; + + if (IS_UARTDMARX_ID(pdev->id)) + idx_offset = 0; + else if (IS_UARTDMATX_ID(pdev->id)) + idx_offset = UART_DMARX_NR; + + /* init txdma or rxdma */ + if (idx_offset >= 0) { + clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + ret = clk_prepare_enable(clk); + if (ret) + return ret; + + if (idx_offset == 0) + idx = idx_offset + pdev->id - ID_BASE_DMARX; + else + idx = idx_offset + pdev->id - ID_BASE_DMATX; + + res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res_mem) + return -ENODEV; + + sprintf(peri_name, "PERI%d", (idx & 0x01)); + + clk = devm_clk_get(&pdev->dev, peri_name); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + ret = clk_prepare_enable(clk); + if (ret) + return ret; + + sunplus_uartdma[idx].addr_phy = + (unsigned long)(res_mem->start); + sunplus_uartdma[idx].membase = + devm_ioremap_resource(&pdev->dev, res_mem); + + if (IS_ERR(sunplus_uartdma[idx].membase)) + return PTR_ERR(sunplus_uartdma[idx].membase); + + if (IS_UARTDMARX_ID(pdev->id)) { + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return -ENODEV; + + sunplus_uartdma[idx].irq = irq; + } else { + res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1); + if (!res_mem) + return -ENODEV; + + sunplus_uartdma[idx].gdma_membase = + devm_ioremap_resource(&pdev->dev, res_mem); + + if (IS_ERR(sunplus_uartdma[idx].gdma_membase)) + return -EINVAL; + } + + if (of_property_read_u32(pdev->dev.of_node, "which-uart", &idx_which_uart) != 0) { + dev_err(&pdev->dev, "\"which-uart\" is not assigned."); + return -EINVAL; + } + + if (idx_which_uart >= UART_NR) { + dev_err(&pdev->dev, "\"which-uart\" is not valid."); + return -EINVAL; + } + + sunplus_uartdma[idx].which_uart = idx_which_uart; + + return 0; + } else if (pdev->id < 0 || pdev->id >= UART_NR) + return -EINVAL; + + /* init uart */ + port = &sunplus_uart_ports[pdev->id].uport; + if (port->membase) + return -EBUSY; + + memset(port, 0, sizeof(*port)); + + res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res_mem) + return -ENODEV; + + port->dev = &pdev->dev; + port->mapbase = res_mem->start; + + port->membase = devm_ioremap_resource(&pdev->dev, res_mem); + if (IS_ERR(port->membase)) + return PTR_ERR(port->membase); + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return -ENODEV; + + uart_get_rs485_mode(port); + sunplus_uart_ports[pdev->id].rts_gpio = + devm_gpiod_get(&pdev->dev, "rts", GPIOD_OUT_LOW); + port->rs485_config = sunplus_uart_config_rs485; + sunplus_uart_ports[pdev->id].rts_check_tx_empty.function = NULL; + sunplus_uart_ports[pdev->id].rts_delay_before_send.function = NULL; + sunplus_uart_ports[pdev->id].rts_delay_after_send.function = NULL; + if (port->rs485.flags & SER_RS485_ENABLED) + sunplus_uart_rs485_on(port); + + sunplus_uart_ports[pdev->id].clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(sunplus_uart_ports[pdev->id].clk)) + return PTR_ERR(sunplus_uart_ports[pdev->id].clk); + + ret = clk_prepare_enable(sunplus_uart_ports[pdev->id].clk); + if (ret) + return ret; + + sunplus_uart_ports[pdev->id].rstc = + devm_reset_control_get(&pdev->dev, NULL); + + if (IS_ERR(sunplus_uart_ports[pdev->id].rstc)) + return PTR_ERR(sunplus_uart_ports[pdev->id].rstc); + + ret = reset_control_deassert(sunplus_uart_ports[pdev->id].rstc); + if (ret) + return ret; + + clk = sunplus_uart_ports[pdev->id].clk; + if (IS_ERR(clk)) + port->uartclk = XTAL; + else + port->uartclk = clk_get_rate(clk); + + pllsys = clk_get_sys("pllsys", NULL); + pllsys_rate = clk_get_rate(pllsys); + + sunplus_uart_ports[pdev->id].pllsys_rate = pllsys_rate; + + port->iotype = UPIO_MEM; + port->irq = irq; + port->ops = &sunplus_uart_ops; + port->flags = UPF_BOOT_AUTOCONF; + port->fifosize = 128; + port->line = pdev->id; + +#ifdef CONFIG_SERIAL_SUNPLUS_CONSOLE + if (pdev->id == 0) + port->cons = &sunplus_console; +#endif + + port->private_data = container_of(&sunplus_uart_ports[pdev->id].uport, + struct sunplus_uart_port, uport); + + sprintf(sunplus_uart_ports[pdev->id].name, "sp_uart%d", pdev->id); + + sunplus_uart_ports[pdev->id].uartdma_rx = + sunplus_uartdma_rx_binding(pdev->id); + + if (sunplus_uart_ports[pdev->id].uartdma_rx) + dev_info(port->dev, "%s's Rx is in DMA mode.\n", + sunplus_uart_ports[pdev->id].name); + else + dev_info(port->dev, "%s's Rx is in PIO mode.\n", + sunplus_uart_ports[pdev->id].name); + + sunplus_uart_ports[pdev->id].uartdma_tx = + sunplus_uartdma_tx_binding(pdev->id); + + if (sunplus_uart_ports[pdev->id].uartdma_tx) + dev_info(port->dev, "%s's Tx is in DMA mode.\n", + sunplus_uart_ports[pdev->id].name); + else + dev_info(port->dev, "%s's Tx is in PIO mode.\n", + sunplus_uart_ports[pdev->id].name); + + ret = uart_add_one_port(&sunplus_uart_driver, port); + if (ret) { + port->membase = NULL; + return ret; + } + platform_set_drvdata(pdev, port); + +#ifdef CONFIG_PM_RUNTIME_UART + if (pdev->id != 0) { + pm_runtime_set_autosuspend_delay(&pdev->dev, 5000); + pm_runtime_use_autosuspend(&pdev->dev); + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + } +#endif + return 0; +} + +static int sunplus_uart_remove(struct platform_device *pdev) +{ +#ifdef CONFIG_PM_RUNTIME_UART + if (pdev->id != 0) { + pm_runtime_disable(&pdev->dev); + pm_runtime_set_suspended(&pdev->dev); + } +#endif + uart_remove_one_port(&sunplus_uart_driver, + &sunplus_uart_ports[pdev->id].uport); + + if (pdev->id < UART_NR) { + clk_disable_unprepare(sunplus_uart_ports[pdev->id].clk); + reset_control_assert(sunplus_uart_ports[pdev->id].rstc); + } + + return 0; +} + +static int sunplus_uart_suspend(struct platform_device *pdev, + pm_message_t state) +{ + /* Don't suspend uart0 for cmd line usage */ + if ((pdev->id < UART_NR) && (pdev->id > 0)) + reset_control_assert(sunplus_uart_ports[pdev->id].rstc); + + return 0; +} + +static int sunplus_uart_resume(struct platform_device *pdev) +{ + if (pdev->id < UART_NR) { + clk_prepare_enable(sunplus_uart_ports[pdev->id].clk); + reset_control_deassert(sunplus_uart_ports[pdev->id].rstc); + } + return 0; +} + +static const struct of_device_id sp_uart_of_match[] = { + { .compatible = "sunplus,sp7021-uart" }, + { .compatible = "sunplus,sp7021-uart-rxdma" }, + { .compatible = "sunplus,sp7021-uart-txdma" }, + {} +}; +MODULE_DEVICE_TABLE(of, sp_uart_of_match); + +#ifdef CONFIG_PM_RUNTIME_UART +static int sunplus_uart_runtime_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + + /* Don't suspend uart0 for cmd line usage */ + if ((pdev->id < UART_NR) && (pdev->id > 0)) + reset_control_assert(sunplus_uart_ports[pdev->id].rstc); + + return 0; +} + +static int sunplus_uart_runtime_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + + if (pdev->id < UART_NR) { + clk_prepare_enable(sunplus_uart_ports[pdev->id].clk); + reset_control_deassert(sunplus_uart_ports[pdev->id].rstc); + } + + return 0; +} +static const struct dev_pm_ops sp7021_uart_pm_ops = { + .runtime_suspend = sunplus_uart_runtime_suspend, + .runtime_resume = sunplus_uart_runtime_resume, +}; +#define sunplus_uart_pm_ops (&sp7021_uart_pm_ops) +#endif + +static struct platform_driver sunplus_uart_platform_driver = { + .probe = sunplus_uart_probe, + .remove = sunplus_uart_remove, + .suspend = sunplus_uart_suspend, + .resume = sunplus_uart_resume, + .driver = { + .name = "sunplus-uart", + .owner = THIS_MODULE, + .of_match_table = of_match_ptr(sp_uart_of_match), +#ifdef CONFIG_PM_RUNTIME_UART + .pm = sunplus_uart_pm_ops, +#endif + } +}; + +static int __init sunplus_uart_init(void) +{ + int ret; + + memset(sunplus_uart_ports, 0, sizeof(sunplus_uart_ports)); + memset(sunplus_uartdma, 0, sizeof(sunplus_uartdma)); + + if (!uart0_as_console || !(uart_enable_status & 0x01)) + sunplus_uart_driver.cons = NULL; + + /* /proc/tty/driver/(sunplus_uart_driver->driver_name) */ + ret = uart_register_driver(&sunplus_uart_driver); + if (ret < 0) + return ret; + + ret = platform_driver_register(&sunplus_uart_platform_driver); + if (ret != 0) { + uart_unregister_driver(&sunplus_uart_driver); + return ret; + } + + return 0; +} +module_init(sunplus_uart_init); + +module_param(uart0_as_console, uint, 0444); + +#ifdef CONFIG_SERIAL_EARLYCON +static void sunplus_uart_putc(struct uart_port *port, int c) +{ + unsigned int status; + + for (;;) { + status = readl(port->membase + SP_UART_LSR); + if ((status & SP_UART_LSR_TXE) == SP_UART_LSR_TXE) + break; + cpu_relax(); + } + writel(c, port->membase + SP_UART_DATA); +} + +static void sunplus_uart_early_write(struct console *con, + const char *s, unsigned int n) +{ + struct earlycon_device *dev = con->data; + + uart_console_write(&dev->port, s, n, sunplus_uart_putc); +} + +int __init sunplus_uart_early_setup(struct earlycon_device *device, + const char *opt) +{ + if (!(device->port.membase || device->port.iobase)) + return -ENODEV; + + device->con->write = sunplus_uart_early_write; + return 0; +} +OF_EARLYCON_DECLARE(sunplus_uart, "sunplus,sp7021-uart", sunplus_uart_early_setup); +#endif + +MODULE_DESCRIPTION("Sunplus UART driver"); +MODULE_AUTHOR("Hammer Hsieh "); +MODULE_LICENSE("GPL v2"); diff --git a/include/soc/sunplus/sp_uart.h b/include/soc/sunplus/sp_uart.h new file mode 100644 index 0000000..44bc1fb --- /dev/null +++ b/include/soc/sunplus/sp_uart.h @@ -0,0 +1,147 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Sunplus SoC UART driver header file + */ + +#ifndef __SP_UART_H__ +#define __SP_UART_H__ + +#ifdef CONFIG_DEBUG_SP_UART +#include + +#define LL_UART_PADDR PA_IOB_ADDR(18 * 32 * 4) +#define LL_UART_VADDR VA_IOB_ADDR(18 * 32 * 4) +#define LOGI_ADDR_UART0_REG VA_IOB_ADDR(18 * 32 * 4) +#endif + +/* + * UART REG + * + */ +#define SP_UART_DATA 0x00 +#define SP_UART_LSR 0x04 +#define SP_UART_MSR 0x08 +#define SP_UART_LCR 0x0C +#define SP_UART_MCR 0x10 +#define SP_UART_DIV_L 0x14 +#define SP_UART_DIV_H 0x18 +#define SP_UART_ISC 0x1C +#define SP_UART_TX_RESIDUE 0x20 +#define SP_UART_RX_RESIDUE 0x24 + +/* lsr + * 1: trasmit fifo is empty + */ +#define SP_UART_LSR_TXE (1 << 6) + +/* interrupt + * SP_UART_LSR_BC : break condition + * SP_UART_LSR_FE : frame error + * SP_UART_LSR_OE : overrun error + * SP_UART_LSR_PE : parity error + * SP_UART_LSR_RX : 1: receive fifo not empty + * SP_UART_LSR_TX : 1: transmit fifo is not full + */ +#define SP_UART_CREAD_DISABLED (1 << 16) +#define SP_UART_LSR_BC (1 << 5) +#define SP_UART_LSR_FE (1 << 4) +#define SP_UART_LSR_OE (1 << 3) +#define SP_UART_LSR_PE (1 << 2) +#define SP_UART_LSR_RX (1 << 1) +#define SP_UART_LSR_TX (1 << 0) + +#define SP_UART_LSR_BRK_ERROR_BITS \ + (SP_UART_LSR_PE | SP_UART_LSR_OE | SP_UART_LSR_FE | SP_UART_LSR_BC) + +/* lcr */ +#define SP_UART_LCR_WL5 (0 << 0) +#define SP_UART_LCR_WL6 (1 << 0) +#define SP_UART_LCR_WL7 (2 << 0) +#define SP_UART_LCR_WL8 (3 << 0) +#define SP_UART_LCR_ST (1 << 2) +#define SP_UART_LCR_PE (1 << 3) +#define SP_UART_LCR_PR (1 << 4) +#define SP_UART_LCR_BC (1 << 5) + +/* isc + * SP_UART_ISC_MSM : Modem status ctrl + * SP_UART_ISC_LSM : Line status interrupt + * SP_UART_ISC_RXM : RX interrupt, when got some input data + * SP_UART_ISC_TXM : TX interrupt, when trans start + */ +#define SP_UART_ISC_MSM (1 << 7) +#define SP_UART_ISC_LSM (1 << 6) +#define SP_UART_ISC_RXM (1 << 5) +#define SP_UART_ISC_TXM (1 << 4) +#define HAS_UART_ISC_FLAGMASK 0x0F +#define SP_UART_ISC_MS (1 << 3) +#define SP_UART_ISC_LS (1 << 2) +#define SP_UART_ISC_RX (1 << 1) +#define SP_UART_ISC_TX (1 << 0) + +/* modem control register */ +#define SP_UART_MCR_AT (1 << 7) +#define SP_UART_MCR_AC (1 << 6) +#define SP_UART_MCR_AR (1 << 5) +#define SP_UART_MCR_LB (1 << 4) +#define SP_UART_MCR_RI (1 << 3) +#define SP_UART_MCR_DCD (1 << 2) +#define SP_UART_MCR_RTS (1 << 1) +#define SP_UART_MCR_DTS (1 << 0) + +/* + * RX DMA REG + * + */ +#define SP_UART_RXDMA_ENABLE_SEL 0x00 +#define DMA_INT (1 << 31) +#define DMA_MSI_ID_SHIFT 12 +#define DMA_MSI_ID_MASK (0x7F << DMA_MSI_ID_SHIFT) +#define DMA_SEL_UARTX_SHIFT 8 +#define DMA_SEL_UARTX_MASK (0x07 << DMA_SEL_UARTX_SHIFT) +#define DMA_SW_RST_B (1 << 7) +#define DMA_INIT (1 << 6) +#define DMA_GO (1 << 5) +#define DMA_AUTO_ENABLE (1 << 4) +#define DMA_TIMEOUT_INT_EN (1 << 3) +#define DMA_P_SAFE_DISABLE (1 << 2) +#define DMA_PBUS_DATA_SWAP (1 << 1) +#define DMA_ENABLE (1 << 0) +#define SP_UART_RXDMA_START_ADDR 0x04 +#define SP_UART_RXDMA_TIMEOUT_SET 0x08 +#define SP_UART_RXDMA_WR_ADR 0x10 +#define SP_UART_RXDMA_RD_ADR 0x14 +#define SP_UART_RXDMA_LENGTH_THR 0x18 +#define SP_UART_RXDMA_END_ADDR 0x1C +#define SP_UART_RXDMA_DATABYTES 0x20 +#define SP_UART_RXDMA_DEBUG_INFO 0x24 +/* + * TX DMA REG + * + */ +#define SP_UART_TXDMA_ENABLE 0x00 +#define SP_UART_TXDMA_SEL 0x04 +#define SP_UART_TXDMA_START_ADDR 0x08 +#define SP_UART_TXDMA_END_ADDR 0x0C +#define SP_UART_TXDMA_WR_ADR 0x10 +#define SP_UART_TXDMA_RD_ADR 0x14 +#define SP_UART_TXDMA_STATUS 0x18 +#define TXDMA_BUF_FULL 0x01 +#define TXDMA_BUF_EMPTY 0x02 +#define SP_UART_TXDMA_TMR_UNIT 0x1C +#define SP_UART_TXDMA_TMR_CNT 0x20 +#define SP_UART_TXDMA_RST_DONE 0x24 +/* + * TX GDMA REG + * + */ +#define SP_UART_TXGDMA_HW_VER 0x00 +#define SP_UART_TXGDMA_CONFIG 0x04 +#define SP_UART_TXGDMA_LENGTH 0x08 +#define SP_UART_TXGDMA_ADDR 0x0C +#define SP_UART_TXGDMA_PORT_MUX 0x10 +#define SP_UART_TXGDMA_INT_FLAG 0x14 +#define SP_UART_TXGDMA_INT_EN 0x18 +#define SP_UART_TXGDMA_SOFT_RESET_STATUS 0x1C + +#endif /* __SP_UART_H__ */