| /* |
| 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 <linux/signal.h> |
| #include <linux/sched.h> |
| #include <linux/interrupt.h> |
| |
| #include "dmxdev.h" |
| #include "dvbdev.h" |
| #include "dvb_demux.h" |
| #include "dvb_frontend.h" |
| #include "dvb_net.h" |
| |
| #include "mantis_common.h" |
| #include "mantis_reg.h" |
| #include "mantis_uart.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" } |
| }; |
| |
| #define UART_MAX_BUF 16 |
| |
| int mantis_uart_read(struct mantis_pci *mantis, u8 *data) |
| { |
| struct mantis_hwconfig *config = mantis->hwconfig; |
| u32 stat = 0, i; |
| |
| /* get data */ |
| for (i = 0; i < (config->bytes + 1); i++) { |
| |
| stat = mmread(MANTIS_UART_STAT); |
| |
| if (stat & MANTIS_UART_RXFIFO_FULL) { |
| dprintk(MANTIS_ERROR, 1, "RX Fifo FULL"); |
| } |
| data[i] = mmread(MANTIS_UART_RXD) & 0x3f; |
| |
| dprintk(MANTIS_DEBUG, 1, "Reading ... <%02x>", data[i] & 0x3f); |
| |
| if (data[i] & (1 << 7)) { |
| dprintk(MANTIS_ERROR, 1, "UART framing error"); |
| return -EINVAL; |
| } |
| if (data[i] & (1 << 6)) { |
| dprintk(MANTIS_ERROR, 1, "UART parity error"); |
| return -EINVAL; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static void mantis_uart_work(struct work_struct *work) |
| { |
| struct mantis_pci *mantis = container_of(work, struct mantis_pci, uart_work); |
| struct mantis_hwconfig *config = mantis->hwconfig; |
| u8 buf[16]; |
| int i; |
| |
| mantis_uart_read(mantis, buf); |
| |
| for (i = 0; i < (config->bytes + 1); i++) |
| dprintk(MANTIS_INFO, 1, "UART BUF:%d <%02x> ", i, buf[i]); |
| |
| dprintk(MANTIS_DEBUG, 0, "\n"); |
| } |
| |
| 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_waitqueue_head(&mantis->uart_wq); |
| spin_lock_init(&mantis->uart_lock); |
| |
| INIT_WORK(&mantis->uart_work, mantis_uart_work); |
| |
| /* disable interrupt */ |
| mmwrite(mmread(MANTIS_UART_CTL) & 0xffef, MANTIS_UART_CTL); |
| |
| mantis_uart_setup(mantis, ¶ms); |
| |
| /* 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_INT_MASK) | 0x800, MANTIS_INT_MASK); |
| mmwrite(mmread(MANTIS_UART_CTL) | MANTIS_UART_RXINT, MANTIS_UART_CTL); |
| |
| schedule_work(&mantis->uart_work); |
| dprintk(MANTIS_DEBUG, 1, "UART succesfully initialized"); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL_GPL(mantis_uart_init); |
| |
| void mantis_uart_exit(struct mantis_pci *mantis) |
| { |
| /* disable interrupt */ |
| mmwrite(mmread(MANTIS_UART_CTL) & 0xffef, MANTIS_UART_CTL); |
| } |
| EXPORT_SYMBOL_GPL(mantis_uart_exit); |