diff options
Diffstat (limited to 'drivers/tty/serial/mvebu-uart.c')
| -rw-r--r-- | drivers/tty/serial/mvebu-uart.c | 495 |
1 files changed, 389 insertions, 106 deletions
diff --git a/drivers/tty/serial/mvebu-uart.c b/drivers/tty/serial/mvebu-uart.c index 45b57c294d13..a100e98259d7 100644 --- a/drivers/tty/serial/mvebu-uart.c +++ b/drivers/tty/serial/mvebu-uart.c @@ -1,21 +1,10 @@ +// SPDX-License-Identifier: GPL-2.0+ /* * *************************************************************************** * Marvell Armada-3700 Serial Driver * Author: Wilson Ding <dingwei@marvell.com> * Copyright (C) 2015 Marvell International Ltd. * *************************************************************************** -* This program is free software: you can redistribute it and/or modify it -* under the terms of the GNU General Public License as published by the Free -* Software Foundation, either version 2 of the License, or any later version. -* -* This program is distributed in the hope that it will be useful, -* but WITHOUT ANY WARRANTY; without even the implied warranty of -* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -* GNU General Public License for more details. -* -* You should have received a copy of the GNU General Public License -* along with this program. If not, see <http://www.gnu.org/licenses/>. -* *************************************************************************** */ #include <linux/clk.h> @@ -38,46 +27,40 @@ #include <linux/tty_flip.h> /* Register Map */ -#define UART_RBR 0x00 -#define RBR_BRK_DET BIT(15) -#define RBR_FRM_ERR_DET BIT(14) -#define RBR_PAR_ERR_DET BIT(13) -#define RBR_OVR_ERR_DET BIT(12) +#define UART_STD_RBR 0x00 +#define UART_EXT_RBR 0x18 -#define UART_TSH 0x04 +#define UART_STD_TSH 0x04 +#define UART_EXT_TSH 0x1C -#define UART_CTRL 0x08 +#define UART_STD_CTRL1 0x08 +#define UART_EXT_CTRL1 0x04 #define CTRL_SOFT_RST BIT(31) #define CTRL_TXFIFO_RST BIT(15) #define CTRL_RXFIFO_RST BIT(14) -#define CTRL_ST_MIRR_EN BIT(13) -#define CTRL_LPBK_EN BIT(12) #define CTRL_SND_BRK_SEQ BIT(11) -#define CTRL_PAR_EN BIT(10) -#define CTRL_TWO_STOP BIT(9) -#define CTRL_TX_HFL_INT BIT(8) -#define CTRL_RX_HFL_INT BIT(7) -#define CTRL_TX_EMP_INT BIT(6) -#define CTRL_TX_RDY_INT BIT(5) -#define CTRL_RX_RDY_INT BIT(4) #define CTRL_BRK_DET_INT BIT(3) #define CTRL_FRM_ERR_INT BIT(2) #define CTRL_PAR_ERR_INT BIT(1) #define CTRL_OVR_ERR_INT BIT(0) -#define CTRL_RX_INT (CTRL_RX_RDY_INT | CTRL_BRK_DET_INT |\ - CTRL_FRM_ERR_INT | CTRL_PAR_ERR_INT | CTRL_OVR_ERR_INT) +#define CTRL_BRK_INT (CTRL_BRK_DET_INT | CTRL_FRM_ERR_INT | \ + CTRL_PAR_ERR_INT | CTRL_OVR_ERR_INT) + +#define UART_STD_CTRL2 UART_STD_CTRL1 +#define UART_EXT_CTRL2 0x20 +#define CTRL_STD_TX_RDY_INT BIT(5) +#define CTRL_EXT_TX_RDY_INT BIT(6) +#define CTRL_STD_RX_RDY_INT BIT(4) +#define CTRL_EXT_RX_RDY_INT BIT(5) -#define UART_STAT 0x0c +#define UART_STAT 0x0C #define STAT_TX_FIFO_EMP BIT(13) -#define STAT_RX_FIFO_EMP BIT(12) #define STAT_TX_FIFO_FUL BIT(11) -#define STAT_TX_FIFO_HFL BIT(10) -#define STAT_RX_TOGL BIT(9) -#define STAT_RX_FIFO_FUL BIT(8) -#define STAT_RX_FIFO_HFL BIT(7) #define STAT_TX_EMP BIT(6) -#define STAT_TX_RDY BIT(5) -#define STAT_RX_RDY BIT(4) +#define STAT_STD_TX_RDY BIT(5) +#define STAT_EXT_TX_RDY BIT(15) +#define STAT_STD_RX_RDY BIT(4) +#define STAT_EXT_RX_RDY BIT(14) #define STAT_BRK_DET BIT(3) #define STAT_FRM_ERR BIT(2) #define STAT_PAR_ERR BIT(1) @@ -86,18 +69,73 @@ | STAT_PAR_ERR | STAT_OVR_ERR) #define UART_BRDV 0x10 +#define BRDV_BAUD_MASK 0x3FF -#define MVEBU_NR_UARTS 1 +#define MVEBU_NR_UARTS 2 #define MVEBU_UART_TYPE "mvebu-uart" +#define DRIVER_NAME "mvebu_serial" + +enum { + /* Either there is only one summed IRQ... */ + UART_IRQ_SUM = 0, + /* ...or there are two separate IRQ for RX and TX */ + UART_RX_IRQ = 0, + UART_TX_IRQ, + UART_IRQ_COUNT +}; -static struct uart_port mvebu_uart_ports[MVEBU_NR_UARTS]; +/* Diverging register offsets */ +struct uart_regs_layout { + unsigned int rbr; + unsigned int tsh; + unsigned int ctrl; + unsigned int intr; +}; + +/* Diverging flags */ +struct uart_flags { + unsigned int ctrl_tx_rdy_int; + unsigned int ctrl_rx_rdy_int; + unsigned int stat_tx_rdy; + unsigned int stat_rx_rdy; +}; + +/* Driver data, a structure for each UART port */ +struct mvebu_uart_driver_data { + bool is_ext; + struct uart_regs_layout regs; + struct uart_flags flags; +}; -struct mvebu_uart_data { +/* MVEBU UART driver structure */ +struct mvebu_uart { struct uart_port *port; - struct clk *clk; + struct clk *clk; + int irq[UART_IRQ_COUNT]; + unsigned char __iomem *nb; + struct mvebu_uart_driver_data *data; }; +static struct mvebu_uart *to_mvuart(struct uart_port *port) +{ + return (struct mvebu_uart *)port->private_data; +} + +#define IS_EXTENDED(port) (to_mvuart(port)->data->is_ext) + +#define UART_RBR(port) (to_mvuart(port)->data->regs.rbr) +#define UART_TSH(port) (to_mvuart(port)->data->regs.tsh) +#define UART_CTRL(port) (to_mvuart(port)->data->regs.ctrl) +#define UART_INTR(port) (to_mvuart(port)->data->regs.intr) + +#define CTRL_TX_RDY_INT(port) (to_mvuart(port)->data->flags.ctrl_tx_rdy_int) +#define CTRL_RX_RDY_INT(port) (to_mvuart(port)->data->flags.ctrl_rx_rdy_int) +#define STAT_TX_RDY(port) (to_mvuart(port)->data->flags.stat_tx_rdy) +#define STAT_RX_RDY(port) (to_mvuart(port)->data->flags.stat_rx_rdy) + +static struct uart_port mvebu_uart_ports[MVEBU_NR_UARTS]; + /* Core UART Driver Operations */ static unsigned int mvebu_uart_tx_empty(struct uart_port *port) { @@ -127,26 +165,39 @@ static void mvebu_uart_set_mctrl(struct uart_port *port, static void mvebu_uart_stop_tx(struct uart_port *port) { - unsigned int ctl = readl(port->membase + UART_CTRL); + unsigned int ctl = readl(port->membase + UART_INTR(port)); - ctl &= ~CTRL_TX_RDY_INT; - writel(ctl, port->membase + UART_CTRL); + ctl &= ~CTRL_TX_RDY_INT(port); + writel(ctl, port->membase + UART_INTR(port)); } static void mvebu_uart_start_tx(struct uart_port *port) { - unsigned int ctl = readl(port->membase + UART_CTRL); + unsigned int ctl; + struct circ_buf *xmit = &port->state->xmit; + + if (IS_EXTENDED(port) && !uart_circ_empty(xmit)) { + writel(xmit->buf[xmit->tail], port->membase + UART_TSH(port)); + xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); + port->icount.tx++; + } - ctl |= CTRL_TX_RDY_INT; - writel(ctl, port->membase + UART_CTRL); + ctl = readl(port->membase + UART_INTR(port)); + ctl |= CTRL_TX_RDY_INT(port); + writel(ctl, port->membase + UART_INTR(port)); } static void mvebu_uart_stop_rx(struct uart_port *port) { - unsigned int ctl = readl(port->membase + UART_CTRL); + unsigned int ctl; + + ctl = readl(port->membase + UART_CTRL(port)); + ctl &= ~CTRL_BRK_INT; + writel(ctl, port->membase + UART_CTRL(port)); - ctl &= ~CTRL_RX_INT; - writel(ctl, port->membase + UART_CTRL); + ctl = readl(port->membase + UART_INTR(port)); + ctl &= ~CTRL_RX_RDY_INT(port); + writel(ctl, port->membase + UART_INTR(port)); } static void mvebu_uart_break_ctl(struct uart_port *port, int brk) @@ -155,12 +206,12 @@ static void mvebu_uart_break_ctl(struct uart_port *port, int brk) unsigned long flags; spin_lock_irqsave(&port->lock, flags); - ctl = readl(port->membase + UART_CTRL); + ctl = readl(port->membase + UART_CTRL(port)); if (brk == -1) ctl |= CTRL_SND_BRK_SEQ; else ctl &= ~CTRL_SND_BRK_SEQ; - writel(ctl, port->membase + UART_CTRL); + writel(ctl, port->membase + UART_CTRL(port)); spin_unlock_irqrestore(&port->lock, flags); } @@ -171,8 +222,8 @@ static void mvebu_uart_rx_chars(struct uart_port *port, unsigned int status) char flag = 0; do { - if (status & STAT_RX_RDY) { - ch = readl(port->membase + UART_RBR); + if (status & STAT_RX_RDY(port)) { + ch = readl(port->membase + UART_RBR(port)); ch &= 0xff; flag = TTY_NORMAL; port->icount.rx++; @@ -198,7 +249,7 @@ static void mvebu_uart_rx_chars(struct uart_port *port, unsigned int status) goto ignore_char; if (status & port->ignore_status_mask & STAT_PAR_ERR) - status &= ~STAT_RX_RDY; + status &= ~STAT_RX_RDY(port); status &= port->read_status_mask; @@ -207,7 +258,7 @@ static void mvebu_uart_rx_chars(struct uart_port *port, unsigned int status) status &= ~port->ignore_status_mask; - if (status & STAT_RX_RDY) + if (status & STAT_RX_RDY(port)) tty_insert_flip_char(tport, ch, flag); if (status & STAT_BRK_DET) @@ -221,7 +272,7 @@ static void mvebu_uart_rx_chars(struct uart_port *port, unsigned int status) ignore_char: status = readl(port->membase + UART_STAT); - } while (status & (STAT_RX_RDY | STAT_BRK_DET)); + } while (status & (STAT_RX_RDY(port) | STAT_BRK_DET)); tty_flip_buffer_push(tport); } @@ -233,7 +284,7 @@ static void mvebu_uart_tx_chars(struct uart_port *port, unsigned int status) unsigned int st; if (port->x_char) { - writel(port->x_char, port->membase + UART_TSH); + writel(port->x_char, port->membase + UART_TSH(port)); port->icount.tx++; port->x_char = 0; return; @@ -245,7 +296,7 @@ static void mvebu_uart_tx_chars(struct uart_port *port, unsigned int status) } for (count = 0; count < port->fifosize; count++) { - writel(xmit->buf[xmit->tail], port->membase + UART_TSH); + writel(xmit->buf[xmit->tail], port->membase + UART_TSH(port)); xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); port->icount.tx++; @@ -269,10 +320,34 @@ static irqreturn_t mvebu_uart_isr(int irq, void *dev_id) struct uart_port *port = (struct uart_port *)dev_id; unsigned int st = readl(port->membase + UART_STAT); - if (st & (STAT_RX_RDY | STAT_OVR_ERR | STAT_FRM_ERR | STAT_BRK_DET)) + if (st & (STAT_RX_RDY(port) | STAT_OVR_ERR | STAT_FRM_ERR | + STAT_BRK_DET)) mvebu_uart_rx_chars(port, st); - if (st & STAT_TX_RDY) + if (st & STAT_TX_RDY(port)) + mvebu_uart_tx_chars(port, st); + + return IRQ_HANDLED; +} + +static irqreturn_t mvebu_uart_rx_isr(int irq, void *dev_id) +{ + struct uart_port *port = (struct uart_port *)dev_id; + unsigned int st = readl(port->membase + UART_STAT); + + if (st & (STAT_RX_RDY(port) | STAT_OVR_ERR | STAT_FRM_ERR | + STAT_BRK_DET)) + mvebu_uart_rx_chars(port, st); + + return IRQ_HANDLED; +} + +static irqreturn_t mvebu_uart_tx_isr(int irq, void *dev_id) +{ + struct uart_port *port = (struct uart_port *)dev_id; + unsigned int st = readl(port->membase + UART_STAT); + + if (st & STAT_TX_RDY(port)) mvebu_uart_tx_chars(port, st); return IRQ_HANDLED; @@ -280,18 +355,57 @@ static irqreturn_t mvebu_uart_isr(int irq, void *dev_id) static int mvebu_uart_startup(struct uart_port *port) { + struct mvebu_uart *mvuart = to_mvuart(port); + unsigned int ctl; int ret; writel(CTRL_TXFIFO_RST | CTRL_RXFIFO_RST, - port->membase + UART_CTRL); + port->membase + UART_CTRL(port)); udelay(1); - writel(CTRL_RX_INT, port->membase + UART_CTRL); - ret = request_irq(port->irq, mvebu_uart_isr, port->irqflags, "serial", - port); - if (ret) { - dev_err(port->dev, "failed to request irq\n"); - return ret; + /* Clear the error bits of state register before IRQ request */ + ret = readl(port->membase + UART_STAT); + ret |= STAT_BRK_ERR; + writel(ret, port->membase + UART_STAT); + + writel(CTRL_BRK_INT, port->membase + UART_CTRL(port)); + + ctl = readl(port->membase + UART_INTR(port)); + ctl |= CTRL_RX_RDY_INT(port); + writel(ctl, port->membase + UART_INTR(port)); + + if (!mvuart->irq[UART_TX_IRQ]) { + /* Old bindings with just one interrupt (UART0 only) */ + ret = devm_request_irq(port->dev, mvuart->irq[UART_IRQ_SUM], + mvebu_uart_isr, port->irqflags, + dev_name(port->dev), port); + if (ret) { + dev_err(port->dev, "unable to request IRQ %d\n", + mvuart->irq[UART_IRQ_SUM]); + return ret; + } + } else { + /* New bindings with an IRQ for RX and TX (both UART) */ + ret = devm_request_irq(port->dev, mvuart->irq[UART_RX_IRQ], + mvebu_uart_rx_isr, port->irqflags, + dev_name(port->dev), port); + if (ret) { + dev_err(port->dev, "unable to request IRQ %d\n", + mvuart->irq[UART_RX_IRQ]); + return ret; + } + + ret = devm_request_irq(port->dev, mvuart->irq[UART_TX_IRQ], + mvebu_uart_tx_isr, port->irqflags, + dev_name(port->dev), + port); + if (ret) { + dev_err(port->dev, "unable to request IRQ %d\n", + mvuart->irq[UART_TX_IRQ]); + devm_free_irq(port->dev, mvuart->irq[UART_RX_IRQ], + port); + return ret; + } } return 0; @@ -299,9 +413,41 @@ static int mvebu_uart_startup(struct uart_port *port) static void mvebu_uart_shutdown(struct uart_port *port) { - writel(0, port->membase + UART_CTRL); + struct mvebu_uart *mvuart = to_mvuart(port); + + writel(0, port->membase + UART_INTR(port)); + + if (!mvuart->irq[UART_TX_IRQ]) { + devm_free_irq(port->dev, mvuart->irq[UART_IRQ_SUM], port); + } else { + devm_free_irq(port->dev, mvuart->irq[UART_RX_IRQ], port); + devm_free_irq(port->dev, mvuart->irq[UART_TX_IRQ], port); + } +} + +static int mvebu_uart_baud_rate_set(struct uart_port *port, unsigned int baud) +{ + struct mvebu_uart *mvuart = to_mvuart(port); + unsigned int baud_rate_div; + u32 brdv; + + if (IS_ERR(mvuart->clk)) + return -PTR_ERR(mvuart->clk); + + /* + * The UART clock is divided by the value of the divisor to generate + * UCLK_OUT clock, which is 16 times faster than the baudrate. + * This prescaler can achieve all standard baudrates until 230400. + * Higher baudrates could be achieved for the extended UART by using the + * programmable oversampling stack (also called fractional divisor). + */ + baud_rate_div = DIV_ROUND_UP(port->uartclk, baud * 16); + brdv = readl(port->membase + UART_BRDV); + brdv &= ~BRDV_BAUD_MASK; + brdv |= baud_rate_div; + writel(brdv, port->membase + UART_BRDV); - free_irq(port->irq, port); + return 0; } static void mvebu_uart_set_termios(struct uart_port *port, @@ -313,8 +459,8 @@ static void mvebu_uart_set_termios(struct uart_port *port, spin_lock_irqsave(&port->lock, flags); - port->read_status_mask = STAT_RX_RDY | STAT_OVR_ERR | - STAT_TX_RDY | STAT_TX_FIFO_FUL; + port->read_status_mask = STAT_RX_RDY(port) | STAT_OVR_ERR | + STAT_TX_RDY(port) | STAT_TX_FIFO_FUL; if (termios->c_iflag & INPCK) port->read_status_mask |= STAT_FRM_ERR | STAT_PAR_ERR; @@ -325,13 +471,32 @@ static void mvebu_uart_set_termios(struct uart_port *port, STAT_FRM_ERR | STAT_PAR_ERR | STAT_OVR_ERR; if ((termios->c_cflag & CREAD) == 0) - port->ignore_status_mask |= STAT_RX_RDY | STAT_BRK_ERR; - - if (old) - tty_termios_copy_hw(termios, old); + port->ignore_status_mask |= STAT_RX_RDY(port) | STAT_BRK_ERR; + + /* + * Maximum achievable frequency with simple baudrate divisor is 230400. + * Since the error per bit frame would be of more than 15%, achieving + * higher frequencies would require to implement the fractional divisor + * feature. + */ + baud = uart_get_baud_rate(port, termios, old, 0, 230400); + if (mvebu_uart_baud_rate_set(port, baud)) { + /* No clock available, baudrate cannot be changed */ + if (old) + baud = uart_get_baud_rate(port, old, NULL, 0, 230400); + } else { + tty_termios_encode_baud_rate(termios, baud, baud); + uart_update_timeout(port, termios->c_cflag, baud); + } - baud = uart_get_baud_rate(port, termios, old, 0, 460800); - uart_update_timeout(port, termios->c_cflag, baud); + /* Only the following flag changes are supported */ + if (old) { + termios->c_iflag &= INPCK | IGNPAR; + termios->c_iflag |= old->c_iflag & ~(INPCK | IGNPAR); + termios->c_cflag &= CREAD | CBAUD; + termios->c_cflag |= old->c_cflag & ~(CREAD | CBAUD); + termios->c_lflag = old->c_lflag; + } spin_unlock_irqrestore(&port->lock, flags); } @@ -356,10 +521,10 @@ static int mvebu_uart_get_poll_char(struct uart_port *port) { unsigned int st = readl(port->membase + UART_STAT); - if (!(st & STAT_RX_RDY)) + if (!(st & STAT_RX_RDY(port))) return NO_POLL_CHAR; - return readl(port->membase + UART_RBR); + return readl(port->membase + UART_RBR(port)); } static void mvebu_uart_put_poll_char(struct uart_port *port, unsigned char c) @@ -375,7 +540,7 @@ static void mvebu_uart_put_poll_char(struct uart_port *port, unsigned char c) udelay(1); } - writel(c, port->membase + UART_TSH); + writel(c, port->membase + UART_TSH(port)); } #endif @@ -413,7 +578,8 @@ static void mvebu_uart_putc(struct uart_port *port, int c) break; } - writel(c, port->membase + UART_TSH); + /* At early stage, DT is not parsed yet, only use UART0 */ + writel(c, port->membase + UART_STD_TSH); for (;;) { st = readl(port->membase + UART_STAT); @@ -458,7 +624,7 @@ static void wait_for_xmitr(struct uart_port *port) static void mvebu_uart_console_putchar(struct uart_port *port, int ch) { wait_for_xmitr(port); - writel(ch, port->membase + UART_TSH); + writel(ch, port->membase + UART_TSH(port)); } static void mvebu_uart_console_write(struct console *co, const char *s, @@ -466,7 +632,7 @@ static void mvebu_uart_console_write(struct console *co, const char *s, { struct uart_port *port = &mvebu_uart_ports[co->index]; unsigned long flags; - unsigned int ier; + unsigned int ier, intr, ctl; int locked = 1; if (oops_in_progress) @@ -474,16 +640,23 @@ static void mvebu_uart_console_write(struct console *co, const char *s, else spin_lock_irqsave(&port->lock, flags); - ier = readl(port->membase + UART_CTRL) & - (CTRL_RX_INT | CTRL_TX_RDY_INT); - writel(0, port->membase + UART_CTRL); + ier = readl(port->membase + UART_CTRL(port)) & CTRL_BRK_INT; + intr = readl(port->membase + UART_INTR(port)) & + (CTRL_RX_RDY_INT(port) | CTRL_TX_RDY_INT(port)); + writel(0, port->membase + UART_CTRL(port)); + writel(0, port->membase + UART_INTR(port)); uart_console_write(port, s, count, mvebu_uart_console_putchar); wait_for_xmitr(port); if (ier) - writel(ier, port->membase + UART_CTRL); + writel(ier, port->membase + UART_CTRL(port)); + + if (intr) { + ctl = intr | readl(port->membase + UART_INTR(port)); + writel(ctl, port->membase + UART_INTR(port)); + } if (locked) spin_unlock_irqrestore(&port->lock, flags); @@ -538,7 +711,7 @@ console_initcall(mvebu_uart_console_init); static struct uart_driver mvebu_uart_driver = { .owner = THIS_MODULE, - .driver_name = "mvebu_serial", + .driver_name = DRIVER_NAME, .dev_name = "ttyMV", .nr = MVEBU_NR_UARTS, #ifdef CONFIG_SERIAL_MVEBU_CONSOLE @@ -546,20 +719,39 @@ static struct uart_driver mvebu_uart_driver = { #endif }; +static const struct of_device_id mvebu_uart_of_match[]; + +/* Counter to keep track of each UART port id when not using CONFIG_OF */ +static int uart_num_counter; + static int mvebu_uart_probe(struct platform_device *pdev) { struct resource *reg = platform_get_resource(pdev, IORESOURCE_MEM, 0); - struct resource *irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); + const struct of_device_id *match = of_match_device(mvebu_uart_of_match, + &pdev->dev); struct uart_port *port; - struct mvebu_uart_data *data; - int ret; + struct mvebu_uart *mvuart; + int ret, id, irq; + + if (!reg) { + dev_err(&pdev->dev, "no registers defined\n"); + return -EINVAL; + } + + /* Assume that all UART ports have a DT alias or none has */ + id = of_alias_get_id(pdev->dev.of_node, "serial"); + if (!pdev->dev.of_node || id < 0) + pdev->id = uart_num_counter++; + else + pdev->id = id; - if (!reg || !irq) { - dev_err(&pdev->dev, "no registers/irq defined\n"); + if (pdev->id >= MVEBU_NR_UARTS) { + dev_err(&pdev->dev, "cannot have more than %d UART ports\n", + MVEBU_NR_UARTS); return -EINVAL; } - port = &mvebu_uart_ports[0]; + port = &mvebu_uart_ports[pdev->id]; spin_lock_init(&port->lock); @@ -571,9 +763,14 @@ static int mvebu_uart_probe(struct platform_device *pdev) port->fifosize = 32; port->iotype = UPIO_MEM32; port->flags = UPF_FIXED_PORT; - port->line = 0; /* single port: force line number to 0 */ - - port->irq = irq->start; + port->line = pdev->id; + + /* + * IRQ number is not stored in this structure because we may have two of + * them per port (RX and TX). Instead, use the driver UART structure + * array so called ->irq[]. + */ + port->irq = 0; port->irqflags = 0; port->mapbase = reg->start; @@ -581,15 +778,70 @@ static int mvebu_uart_probe(struct platform_device *pdev) if (IS_ERR(port->membase)) return -PTR_ERR(port->membase); - data = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_uart_data), - GFP_KERNEL); - if (!data) + mvuart = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_uart), + GFP_KERNEL); + if (!mvuart) return -ENOMEM; - data->port = port; + /* Get controller data depending on the compatible string */ + mvuart->data = (struct mvebu_uart_driver_data *)match->data; + mvuart->port = port; + + port->private_data = mvuart; + platform_set_drvdata(pdev, mvuart); + + /* Get fixed clock frequency */ + mvuart->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(mvuart->clk)) { + if (PTR_ERR(mvuart->clk) == -EPROBE_DEFER) + return PTR_ERR(mvuart->clk); + + if (IS_EXTENDED(port)) { + dev_err(&pdev->dev, "unable to get UART clock\n"); + return PTR_ERR(mvuart->clk); + } + } else { + if (!clk_prepare_enable(mvuart->clk)) + port->uartclk = clk_get_rate(mvuart->clk); + } + + /* Manage interrupts */ + if (platform_irq_count(pdev) == 1) { + /* Old bindings: no name on the single unamed UART0 IRQ */ + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + dev_err(&pdev->dev, "unable to get UART IRQ\n"); + return irq; + } + + mvuart->irq[UART_IRQ_SUM] = irq; + } else { + /* + * New bindings: named interrupts (RX, TX) for both UARTS, + * only make use of uart-rx and uart-tx interrupts, do not use + * uart-sum of UART0 port. + */ + irq = platform_get_irq_byname(pdev, "uart-rx"); + if (irq < 0) { + dev_err(&pdev->dev, "unable to get 'uart-rx' IRQ\n"); + return irq; + } + + mvuart->irq[UART_RX_IRQ] = irq; - port->private_data = data; - platform_set_drvdata(pdev, data); + irq = platform_get_irq_byname(pdev, "uart-tx"); + if (irq < 0) { + dev_err(&pdev->dev, "unable to get 'uart-tx' IRQ\n"); + return irq; + } + + mvuart->irq[UART_TX_IRQ] = irq; + } + + /* UART Soft Reset*/ + writel(CTRL_SOFT_RST, port->membase + UART_CTRL(port)); + udelay(1); + writel(0, port->membase + UART_CTRL(port)); ret = uart_add_one_port(&mvebu_uart_driver, port); if (ret) @@ -597,9 +849,40 @@ static int mvebu_uart_probe(struct platform_device *pdev) return 0; } +static struct mvebu_uart_driver_data uart_std_driver_data = { + .is_ext = false, + .regs.rbr = UART_STD_RBR, + .regs.tsh = UART_STD_TSH, + .regs.ctrl = UART_STD_CTRL1, + .regs.intr = UART_STD_CTRL2, + .flags.ctrl_tx_rdy_int = CTRL_STD_TX_RDY_INT, + .flags.ctrl_rx_rdy_int = CTRL_STD_RX_RDY_INT, + .flags.stat_tx_rdy = STAT_STD_TX_RDY, + .flags.stat_rx_rdy = STAT_STD_RX_RDY, +}; + +static struct mvebu_uart_driver_data uart_ext_driver_data = { + .is_ext = true, + .regs.rbr = UART_EXT_RBR, + .regs.tsh = UART_EXT_TSH, + .regs.ctrl = UART_EXT_CTRL1, + .regs.intr = UART_EXT_CTRL2, + .flags.ctrl_tx_rdy_int = CTRL_EXT_TX_RDY_INT, + .flags.ctrl_rx_rdy_int = CTRL_EXT_RX_RDY_INT, + .flags.stat_tx_rdy = STAT_EXT_TX_RDY, + .flags.stat_rx_rdy = STAT_EXT_RX_RDY, +}; + /* Match table for of_platform binding */ static const struct of_device_id mvebu_uart_of_match[] = { - { .compatible = "marvell,armada-3700-uart", }, + { + .compatible = "marvell,armada-3700-uart", + .data = (void *)&uart_std_driver_data, + }, + { + .compatible = "marvell,armada-3700-uart-ext", + .data = (void *)&uart_ext_driver_data, + }, {} }; |