1/*
  2	Mantis PCI bridge driver
  3
  4	Copyright (C) Manu Abraham (abraham.manu@gmail.com)
  5
  6	This program is free software; you can redistribute it and/or modify
  7	it under the terms of the GNU General Public License as published by
  8	the Free Software Foundation; either version 2 of the License, or
  9	(at your option) any later version.
 10
 11	This program is distributed in the hope that it will be useful,
 12	but WITHOUT ANY WARRANTY; without even the implied warranty of
 13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14	GNU General Public License for more details.
 15
 16	You should have received a copy of the GNU General Public License
 17	along with this program; if not, write to the Free Software
 18	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 19*/
 20
 21#include <linux/kernel.h>
 22#include <linux/spinlock.h>
 23#include <asm/io.h>
 24
 25#include <linux/signal.h>
 26#include <linux/sched.h>
 27#include <linux/interrupt.h>
 28#include <linux/pci.h>
 29
 30#include "dmxdev.h"
 31#include "dvbdev.h"
 32#include "dvb_demux.h"
 33#include "dvb_frontend.h"
 34#include "dvb_net.h"
 35
 36#include "mantis_common.h"
 37#include "mantis_reg.h"
 38#include "mantis_uart.h"
 39#include "mantis_input.h"
 40
 41struct mantis_uart_params {
 42	enum mantis_baud	baud_rate;
 43	enum mantis_parity	parity;
 44};
 45
 46static struct {
 47	char string[7];
 48} rates[5] = {
 49	{ "9600" },
 50	{ "19200" },
 51	{ "38400" },
 52	{ "57600" },
 53	{ "115200" }
 54};
 55
 56static struct {
 57	char string[5];
 58} parity[3] = {
 59	{ "NONE" },
 60	{ "ODD" },
 61	{ "EVEN" }
 62};
 63
 64static void mantis_uart_read(struct mantis_pci *mantis)
 65{
 66	struct mantis_hwconfig *config = mantis->hwconfig;
 67	int i, scancode = 0, err = 0;
 68
 69	/* get data */
 70	dprintk(MANTIS_DEBUG, 1, "UART Reading ...");
 71	for (i = 0; i < (config->bytes + 1); i++) {
 72		int data = mmread(MANTIS_UART_RXD);
 73
 74		dprintk(MANTIS_DEBUG, 0, " <%02x>", data);
 75
 76		scancode = (scancode << 8) | (data & 0x3f);
 77		err |= data;
 78
 79		if (data & (1 << 7))
 80			dprintk(MANTIS_ERROR, 1, "UART framing error");
 81
 82		if (data & (1 << 6))
 83			dprintk(MANTIS_ERROR, 1, "UART parity error");
 84	}
 85	dprintk(MANTIS_DEBUG, 0, "\n");
 86
 87	if ((err & 0xC0) == 0)
 88		mantis_input_process(mantis, scancode);
 89}
 90
 91static void mantis_uart_work(struct work_struct *work)
 92{
 93	struct mantis_pci *mantis = container_of(work, struct mantis_pci, uart_work);
 94	u32 stat;
 95
 96	stat = mmread(MANTIS_UART_STAT);
 97
 98	if (stat & MANTIS_UART_RXFIFO_FULL)
 99		dprintk(MANTIS_ERROR, 1, "RX Fifo FULL");
100
101	/*
102	 * MANTIS_UART_RXFIFO_DATA is only set if at least
103	 * config->bytes + 1 bytes are in the FIFO.
104	 */
105	while (stat & MANTIS_UART_RXFIFO_DATA) {
106		mantis_uart_read(mantis);
107		stat = mmread(MANTIS_UART_STAT);
108	}
109
110	/* re-enable UART (RX) interrupt */
111	mantis_unmask_ints(mantis, MANTIS_INT_IRQ1);
112}
113
114static int mantis_uart_setup(struct mantis_pci *mantis,
115			     struct mantis_uart_params *params)
116{
117	u32 reg;
118
119	mmwrite((mmread(MANTIS_UART_CTL) | (params->parity & 0x3)), MANTIS_UART_CTL);
120
121	reg = mmread(MANTIS_UART_BAUD);
122
123	switch (params->baud_rate) {
124	case MANTIS_BAUD_9600:
125		reg |= 0xd8;
126		break;
127	case MANTIS_BAUD_19200:
128		reg |= 0x6c;
129		break;
130	case MANTIS_BAUD_38400:
131		reg |= 0x36;
132		break;
133	case MANTIS_BAUD_57600:
134		reg |= 0x23;
135		break;
136	case MANTIS_BAUD_115200:
137		reg |= 0x11;
138		break;
139	default:
140		return -EINVAL;
141	}
142
143	mmwrite(reg, MANTIS_UART_BAUD);
144
145	return 0;
146}
147
148int mantis_uart_init(struct mantis_pci *mantis)
149{
150	struct mantis_hwconfig *config = mantis->hwconfig;
151	struct mantis_uart_params params;
152
153	/* default parity: */
154	params.baud_rate = config->baud_rate;
155	params.parity = config->parity;
156	dprintk(MANTIS_INFO, 1, "Initializing UART @ %sbps parity:%s",
157		rates[params.baud_rate].string,
158		parity[params.parity].string);
159
160	INIT_WORK(&mantis->uart_work, mantis_uart_work);
161
162	/* disable interrupt */
163	mmwrite(mmread(MANTIS_UART_CTL) & 0xffef, MANTIS_UART_CTL);
164
165	mantis_uart_setup(mantis, &params);
166
167	/* default 1 byte */
168	mmwrite((mmread(MANTIS_UART_BAUD) | (config->bytes << 8)), MANTIS_UART_BAUD);
169
170	/* flush buffer */
171	mmwrite((mmread(MANTIS_UART_CTL) | MANTIS_UART_RXFLUSH), MANTIS_UART_CTL);
172
173	/* enable interrupt */
174	mmwrite(mmread(MANTIS_UART_CTL) | MANTIS_UART_RXINT, MANTIS_UART_CTL);
175	mantis_unmask_ints(mantis, MANTIS_INT_IRQ1);
176
177	schedule_work(&mantis->uart_work);
178	dprintk(MANTIS_DEBUG, 1, "UART successfully initialized");
179
180	return 0;
181}
182EXPORT_SYMBOL_GPL(mantis_uart_init);
183
184void mantis_uart_exit(struct mantis_pci *mantis)
185{
186	/* disable interrupt */
187	mantis_mask_ints(mantis, MANTIS_INT_IRQ1);
188	mmwrite(mmread(MANTIS_UART_CTL) & 0xffef, MANTIS_UART_CTL);
189	flush_work(&mantis->uart_work);
190}
191EXPORT_SYMBOL_GPL(mantis_uart_exit);