text: /*
  	Mantis PCI bridge driver
  
  	Copyright (C) Manu Abraham (abraham.manu@gmail.com)
  
  	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
  	(at your option) 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, write to the Free Software
  	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
  
  #include <linux/kernel.h>
  #include <linux/spinlock.h>
  #include <asm/io.h>
  
  #include <linux/signal.h>
  #include <linux/sched.h>
  #include <linux/interrupt.h>
  #include <linux/pci.h>
  
  #include <media/dmxdev.h>
  #include <media/dvbdev.h>
  #include <media/dvb_demux.h>
  #include <media/dvb_frontend.h>
  #include <media/dvb_net.h>
  
  #include "mantis_common.h"
  #include "mantis_reg.h"
  #include "mantis_uart.h"
  #include "mantis_input.h"
  
  struct mantis_uart_params {
  	enum mantis_baud	baud_rate;
  	enum mantis_parity	parity;
  };
  
  static struct {
  	char string[7];
  } rates[5] = {
  	{ "9600" },
  	{ "19200" },
  	{ "38400" },
  	{ "57600" },
  	{ "115200" }
  };
  
  static struct {
  	char string[5];
  } parity[3] = {
  	{ "NONE" },
  	{ "ODD" },
  	{ "EVEN" }
  };
  
  static void mantis_uart_read(struct mantis_pci *mantis)
  {
  	struct mantis_hwconfig *config = mantis->hwconfig;
  	int i, scancode = 0, err = 0;
  
  	/* get data */
  	dprintk(MANTIS_DEBUG, 1, "UART Reading ...");
  	for (i = 0; i < (config->bytes + 1); i++) {
  		int data = mmread(MANTIS_UART_RXD);
  
  		dprintk(MANTIS_DEBUG, 0, " <%02x>", data);
  
  		scancode = (scancode << 8) | (data & 0x3f);
  		err |= data;
  
  		if (data & (1 << 7))
  			dprintk(MANTIS_ERROR, 1, "UART framing error");
  
  		if (data & (1 << 6))
  			dprintk(MANTIS_ERROR, 1, "UART parity error");
  	}
  	dprintk(MANTIS_DEBUG, 0, "\n");
  
  	if ((err & 0xC0) == 0)
  		mantis_input_process(mantis, scancode);
  }
  
  static void mantis_uart_work(struct work_struct *work)
  {
  	struct mantis_pci *mantis = container_of(work, struct mantis_pci, uart_work);
  	u32 stat;
  	unsigned long timeout;
  
  	stat = mmread(MANTIS_UART_STAT);
  
  	if (stat & MANTIS_UART_RXFIFO_FULL)
  		dprintk(MANTIS_ERROR, 1, "RX Fifo FULL");
  
  	/*
  	 * MANTIS_UART_RXFIFO_DATA is only set if at least
  	 * config->bytes + 1 bytes are in the FIFO.
  	 */
  
  	/* FIXME: is 10ms good enough ? */
  	timeout = jiffies +  msecs_to_jiffies(10);
  	while (stat & MANTIS_UART_RXFIFO_DATA) {
  		mantis_uart_read(mantis);
  		stat = mmread(MANTIS_UART_STAT);
  
  		if (!time_is_after_jiffies(timeout))
  			break;
  	}
  
  	/* re-enable UART (RX) interrupt */
  	mantis_unmask_ints(mantis, MANTIS_INT_IRQ1);
  }
  
  static int mantis_uart_setup(struct mantis_pci *mantis,
  			     struct mantis_uart_params *params)
  {
  	u32 reg;
  
  	mmwrite((mmread(MANTIS_UART_CTL) | (params->parity & 0x3)), MANTIS_UART_CTL);
  
  	reg = mmread(MANTIS_UART_BAUD);
  
  	switch (params->baud_rate) {
  	case MANTIS_BAUD_9600:
  		reg |= 0xd8;
  		break;
  	case MANTIS_BAUD_19200:
  		reg |= 0x6c;
  		break;
  	case MANTIS_BAUD_38400:
  		reg |= 0x36;
  		break;
  	case MANTIS_BAUD_57600:
  		reg |= 0x23;
  		break;
  	case MANTIS_BAUD_115200:
  		reg |= 0x11;
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	mmwrite(reg, MANTIS_UART_BAUD);
  
  	return 0;
  }
  
  int mantis_uart_init(struct mantis_pci *mantis)
  {
  	struct mantis_hwconfig *config = mantis->hwconfig;
  	struct mantis_uart_params params;
  
  	/* default parity: */
  	params.baud_rate = config->baud_rate;
  	params.parity = config->parity;
  	dprintk(MANTIS_INFO, 1, "Initializing UART @ %sbps parity:%s",
  		rates[params.baud_rate].string,
  		parity[params.parity].string);
  
  	INIT_WORK(&mantis->uart_work, mantis_uart_work);
  
  	/* disable interrupt */
  	mmwrite(mmread(MANTIS_UART_CTL) & 0xffef, MANTIS_UART_CTL);
  
  	mantis_uart_setup(mantis, &params);
  
  	/* default 1 byte */
  	mmwrite((mmread(MANTIS_UART_BAUD) | (config->bytes << 8)), MANTIS_UART_BAUD);
  
  	/* flush buffer */
  	mmwrite((mmread(MANTIS_UART_CTL) | MANTIS_UART_RXFLUSH), MANTIS_UART_CTL);
  
  	/* enable interrupt */
  	mmwrite(mmread(MANTIS_UART_CTL) | MANTIS_UART_RXINT, MANTIS_UART_CTL);
  	mantis_unmask_ints(mantis, MANTIS_INT_IRQ1);
  
  	schedule_work(&mantis->uart_work);
  	dprintk(MANTIS_DEBUG, 1, "UART successfully initialized");
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(mantis_uart_init);
  
  void mantis_uart_exit(struct mantis_pci *mantis)
  {
  	/* disable interrupt */
  	mantis_mask_ints(mantis, MANTIS_INT_IRQ1);
  	mmwrite(mmread(MANTIS_UART_CTL) & 0xffef, MANTIS_UART_CTL);
  	flush_work(&mantis->uart_work);
  }
  EXPORT_SYMBOL_GPL(mantis_uart_exit);
  