From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from beotel.net (mail.beotel.net [194.106.162.23]) by ozlabs.org (Postfix) with ESMTP id BA5F3DDDE1 for ; Thu, 14 Aug 2008 19:41:31 +1000 (EST) Received: from abs-beograd.co.yu (unverified [80.93.243.15]) by beotel.net (SurgeMail 3.7b6) with ESMTP id 1951755 for ; Thu, 14 Aug 2008 11:26:14 +0200 Received: from WorldClient by abs-beograd.co.yu (MDaemon PRO v9.6.6) with ESMTP id md50000141882.msg for ; Thu, 14 Aug 2008 11:23:52 +0200 Date: Thu, 14 Aug 2008 11:23:49 +0200 From: "Sinisa Denic" To: Subject: mpc52xx_uart and rs485 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Message-ID: List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , >>From bf050adbc092043c1ba6e43373563bb761bb2e40 Mon Sep 17 00:00:00 2001 From: Sinisa Denic Date: Wed, 13 Aug 2008 15:57:52 +0200 Subject: [PATCH] mpc52xx_uart RS485 support added Hi Wolfgang and others, below is patch for mpc52xx_usrt.c which add software rs485 support to this driver. It has worked for me and if you think it is good enough it might be useful for someone else. Regards, Sinisa Denic System and software  engineer tel: +381(0)112016142 ABS Control Systems bul.Zorana Djindjica 8a Belgrade,Serbia --- drivers/serial/mpc52xx_uart.c | 47 +++++++++++++++++++++++++++++++++ +------- 1 files changed, 39 insertions(+), 8 deletions(-) diff --git a/drivers/serial/mpc52xx_uart.c b/drivers/serial/mpc52xx_uart.c index 7a3625f..38b2751 100644 --- a/drivers/serial/mpc52xx_uart.c +++ b/drivers/serial/mpc52xx_uart.c @@ -62,7 +62,7 @@ * by the bootloader or in the platform init code. */ -#undef DEBUG +//#undef DEBUG #include #include @@ -142,11 +142,13 @@ struct psc_ops { int (*rx_rdy)(struct uart_port *port); int (*tx_rdy)(struct uart_port *port); int (*tx_empty)(struct uart_port *port); + int (*tx_empty_enabled)(struct uart_port *port); void (*stop_rx)(struct uart_port *port); void (*start_tx)(struct uart_port *port); void (*stop_tx)(struct uart_port *port); void (*rx_clr_irq)(struct uart_port *port); void (*tx_clr_irq)(struct uart_port *port); + void (*tx_empty_clr_irq)(struct uart_port *port); void (*write_char)(struct uart_port *port, unsigned char c); unsigned char (*read_char)(struct uart_port *port); void (*cw_disable_ints)(struct uart_port *port); @@ -169,7 +171,7 @@ static void mpc52xx_psc_fifo_init(struct uart_port *port) out_8(&fifo->tfcntl, 0x07); out_be16(&fifo->tfalarm, 0x80); - port->read_status_mask |= MPC52xx_PSC_IMR_RXRDY | MPC52xx_PSC_IMR_TXRDY; + port->read_status_mask |= MPC52xx_PSC_IMR_RXRDY | MPC52xx_PSC_IMR_TXRDY | MPC52xx_PSC_IMR_TXEMP; out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask); } @@ -200,6 +202,13 @@ static int mpc52xx_psc_tx_rdy(struct uart_port *port) & MPC52xx_PSC_IMR_TXRDY; } +static int mpc52xx_psc_tx_empty_enabled(struct uart_port *port) +{ + return in_be16(&PSC(port)->mpc52xx_psc_isr) + & port->read_status_mask + & MPC52xx_PSC_IMR_TXEMP; +} + static int mpc52xx_psc_tx_empty(struct uart_port *port) { return in_be16(&PSC(port)->mpc52xx_psc_status) @@ -209,6 +218,7 @@ static int mpc52xx_psc_tx_empty(struct uart_port *port) static void mpc52xx_psc_start_tx(struct uart_port *port) { port->read_status_mask |= MPC52xx_PSC_IMR_TXRDY; + port->read_status_mask |= MPC52xx_PSC_IMR_TXEMP; out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask); } @@ -232,6 +242,11 @@ static void mpc52xx_psc_tx_clr_irq(struct uart_port *port) { } +static void mpc52xx_psc_tx_empty_clr_irq(struct uart_port *port) +{ + port->read_status_mask &= ~MPC52xx_PSC_IMR_TXEMP; + out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask); +} static void mpc52xx_psc_write_char(struct uart_port *port, unsigned char c) { out_8(&PSC(port)->mpc52xx_psc_buffer_8, c); @@ -275,11 +290,13 @@ static struct psc_ops mpc52xx_psc_ops = { .rx_rdy = mpc52xx_psc_rx_rdy, .tx_rdy = mpc52xx_psc_tx_rdy, .tx_empty = mpc52xx_psc_tx_empty, + .tx_empty_enabled = mpc52xx_psc_tx_empty_enabled, .stop_rx = mpc52xx_psc_stop_rx, .start_tx = mpc52xx_psc_start_tx, .stop_tx = mpc52xx_psc_stop_tx, .rx_clr_irq = mpc52xx_psc_rx_clr_irq, .tx_clr_irq = mpc52xx_psc_tx_clr_irq, + .tx_empty_clr_irq = mpc52xx_psc_tx_empty_clr_irq, .write_char = mpc52xx_psc_write_char, .read_char = mpc52xx_psc_read_char, .cw_disable_ints = mpc52xx_psc_cw_disable_ints, @@ -583,7 +600,7 @@ mpc52xx_uart_set_termios(struct uart_port *port, struct ktermios *new, mr2 = 0; - + if (new->c_cflag & CSTOPB) mr2 |= MPC52xx_PSC_MODE_TWO_STOP; else @@ -591,7 +608,6 @@ mpc52xx_uart_set_termios(struct uart_port *port, struct ktermios *new, MPC52xx_PSC_MODE_ONE_STOP_5_BITS : MPC52xx_PSC_MODE_ONE_STOP; - baud = uart_get_baud_rate(port, new, old, 0, port->uartclk/16); quot = uart_get_divisor(port, baud); ctr = quot & 0xffff; @@ -735,7 +751,7 @@ mpc52xx_uart_int_rx_chars(struct uart_port *port) struct tty_struct *tty = port->info->tty; unsigned char ch, flag; unsigned short status; - + //printk("Int. citanje...\n"); /* While we can read, do so ! */ while (psc_ops->raw_rx_rdy(port)) { /* Get the char */ @@ -792,7 +808,9 @@ static inline int mpc52xx_uart_int_tx_chars(struct uart_port *port) { struct circ_buf *xmit = &port->info->xmit; + out_8(&PSC(port)->op1,1); +// printk("Int. slanje...\n"); /* Process out of band chars */ if (port->x_char) { psc_ops->write_char(port, port->x_char); @@ -812,8 +830,10 @@ mpc52xx_uart_int_tx_chars(struct uart_port *port) psc_ops->write_char(port, xmit->buf[xmit->tail]); xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); port->icount.tx++; - if (uart_circ_empty(xmit)) + if (uart_circ_empty(xmit)){ +// printk("Uart circular buffer is empty!!\n"); break; + } } /* Wake up */ @@ -828,7 +848,15 @@ mpc52xx_uart_int_tx_chars(struct uart_port *port) return 1; } - +static inline int +mpc52xx_uart_int_tx_empty(struct uart_port *port) +{ + out_8(&PSC(port)->op0,1); + port->read_status_mask &= ~MPC52xx_PSC_IMR_TXEMP; + out_be16(&PSC(port)->mpc52xx_psc_imr, port->read_status_mask); +//printk("tx_empty_interrupt!\n"); + return 0; +} static irqreturn_t mpc52xx_uart_int(int irq, void *dev_id) { @@ -850,7 +878,10 @@ mpc52xx_uart_int(int irq, void *dev_id) psc_ops->tx_clr_irq(port); if (psc_ops->tx_rdy(port)) keepgoing |= mpc52xx_uart_int_tx_chars(port); - + if (psc_ops->tx_empty_enabled(port)){ + keepgoing |= mpc52xx_uart_int_tx_empty(port); +// psc_ops->tx_empty_clr_irq(port); + } /* Limit number of iteration */ if (!(--pass)) keepgoing = 0; -- 1.5.4.5