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@@ -1,909 +0,0 @@
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-/*
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- * mrst_max3110.c - spi uart protocol driver for Maxim 3110
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- *
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- * Copyright (c) 2008-2010, Intel Corporation.
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms and conditions of the GNU General Public License,
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- * version 2, as published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope it will be useful, but WITHOUT
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- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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- * more details.
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- *
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- * You should have received a copy of the GNU General Public License along with
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- * this program; if not, write to the Free Software Foundation, Inc.,
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- * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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- */
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-
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-/*
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- * Note:
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- * 1. From Max3110 spec, the Rx FIFO has 8 words, while the Tx FIFO only has
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- * 1 word. If SPI master controller doesn't support sclk frequency change,
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- * then the char need be sent out one by one with some delay
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- *
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- * 2. Currently only RX available interrupt is used, no need for waiting TXE
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- * interrupt for a low speed UART device
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- */
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-
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-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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-
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-#ifdef CONFIG_MAGIC_SYSRQ
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-#define SUPPORT_SYSRQ
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-#endif
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-
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-#include <linux/module.h>
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-#include <linux/ioport.h>
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-#include <linux/irq.h>
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-#include <linux/init.h>
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-#include <linux/console.h>
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-#include <linux/tty.h>
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-#include <linux/tty_flip.h>
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-#include <linux/serial_core.h>
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-#include <linux/serial_reg.h>
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-
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-#include <linux/kthread.h>
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-#include <linux/spi/spi.h>
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-#include <linux/pm.h>
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-
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-#include "mrst_max3110.h"
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-
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-#define UART_TX_NEEDED 1
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-#define CON_TX_NEEDED 2
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-#define BIT_IRQ_PENDING 3
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-
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-struct uart_max3110 {
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- struct uart_port port;
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- struct spi_device *spi;
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- char name[SPI_NAME_SIZE];
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-
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- wait_queue_head_t wq;
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- struct task_struct *main_thread;
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- struct task_struct *read_thread;
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- struct mutex thread_mutex;
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- struct mutex io_mutex;
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-
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- u32 baud;
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- u16 cur_conf;
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- u8 clock;
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- u8 parity, word_7bits;
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- u16 irq;
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-
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- unsigned long uart_flags;
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-
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- /* console related */
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- struct circ_buf con_xmit;
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-};
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-
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-/* global data structure, may need be removed */
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-static struct uart_max3110 *pmax;
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-
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-static int receive_chars(struct uart_max3110 *max,
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- unsigned short *str, int len);
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-static int max3110_read_multi(struct uart_max3110 *max);
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-static void max3110_con_receive(struct uart_max3110 *max);
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-
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-static int max3110_write_then_read(struct uart_max3110 *max,
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- const void *txbuf, void *rxbuf, unsigned len, int always_fast)
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-{
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- struct spi_device *spi = max->spi;
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- struct spi_message message;
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- struct spi_transfer x;
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- int ret;
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-
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- mutex_lock(&max->io_mutex);
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- spi_message_init(&message);
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- memset(&x, 0, sizeof x);
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- x.len = len;
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- x.tx_buf = txbuf;
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- x.rx_buf = rxbuf;
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- spi_message_add_tail(&x, &message);
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-
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- if (always_fast)
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- x.speed_hz = spi->max_speed_hz;
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- else if (max->baud)
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- x.speed_hz = max->baud;
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-
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- /* Do the i/o */
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- ret = spi_sync(spi, &message);
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- mutex_unlock(&max->io_mutex);
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- return ret;
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-}
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-
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-/* Write a 16b word to the device */
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-static int max3110_out(struct uart_max3110 *max, const u16 out)
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-{
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- void *buf;
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- u16 *obuf, *ibuf;
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- int ret;
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-
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- buf = kzalloc(8, GFP_KERNEL | GFP_DMA);
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- if (!buf)
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- return -ENOMEM;
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-
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- obuf = buf;
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- ibuf = buf + 4;
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- *obuf = out;
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- ret = max3110_write_then_read(max, obuf, ibuf, 2, 1);
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- if (ret) {
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- pr_warn("%s: get err msg %d when sending 0x%x\n",
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- __func__, ret, out);
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- goto exit;
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- }
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-
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- receive_chars(max, ibuf, 1);
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-
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-exit:
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- kfree(buf);
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- return ret;
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-}
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-
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-/*
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- * This is usually used to read data from SPIC RX FIFO, which doesn't
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- * need any delay like flushing character out.
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- *
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- * Return how many valide bytes are read back
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- */
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-static int max3110_read_multi(struct uart_max3110 *max)
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-{
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- void *buf;
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- u16 *obuf, *ibuf;
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- int ret, blen;
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-
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- blen = M3110_RX_FIFO_DEPTH * sizeof(u16);
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- buf = kzalloc(blen * 2, GFP_KERNEL | GFP_DMA);
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- if (!buf)
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- return 0;
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-
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- /* tx/rx always have the same length */
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- obuf = buf;
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- ibuf = buf + blen;
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-
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- if (max3110_write_then_read(max, obuf, ibuf, blen, 1)) {
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- kfree(buf);
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- return 0;
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- }
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-
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- ret = receive_chars(max, ibuf, M3110_RX_FIFO_DEPTH);
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-
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- kfree(buf);
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- return ret;
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-}
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-
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-static void serial_m3110_con_putchar(struct uart_port *port, int ch)
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-{
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- struct uart_max3110 *max =
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- container_of(port, struct uart_max3110, port);
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- struct circ_buf *xmit = &max->con_xmit;
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-
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- if (uart_circ_chars_free(xmit)) {
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- xmit->buf[xmit->head] = (char)ch;
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- xmit->head = (xmit->head + 1) & (PAGE_SIZE - 1);
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- }
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-}
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-
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-/*
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- * Print a string to the serial port trying not to disturb
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- * any possible real use of the port...
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- *
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- * The console_lock must be held when we get here.
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- */
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-static void serial_m3110_con_write(struct console *co,
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- const char *s, unsigned int count)
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-{
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- if (!pmax)
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- return;
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-
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- uart_console_write(&pmax->port, s, count, serial_m3110_con_putchar);
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-
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- if (!test_and_set_bit(CON_TX_NEEDED, &pmax->uart_flags))
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- wake_up(&pmax->wq);
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-}
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-
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-static int __init
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-serial_m3110_con_setup(struct console *co, char *options)
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-{
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- struct uart_max3110 *max = pmax;
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- int baud = 115200;
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- int bits = 8;
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- int parity = 'n';
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- int flow = 'n';
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-
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- pr_info("setting up console\n");
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-
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- if (co->index == -1)
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- co->index = 0;
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-
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- if (!max) {
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- pr_err("pmax is NULL, return\n");
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- return -ENODEV;
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- }
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-
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- if (options)
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- uart_parse_options(options, &baud, &parity, &bits, &flow);
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-
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- return uart_set_options(&max->port, co, baud, parity, bits, flow);
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-}
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-
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-static struct tty_driver *serial_m3110_con_device(struct console *co,
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- int *index)
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-{
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- struct uart_driver *p = co->data;
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- *index = co->index;
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- return p->tty_driver;
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-}
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-
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-static struct uart_driver serial_m3110_reg;
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-static struct console serial_m3110_console = {
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- .name = "ttyS",
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- .write = serial_m3110_con_write,
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- .device = serial_m3110_con_device,
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- .setup = serial_m3110_con_setup,
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- .flags = CON_PRINTBUFFER,
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- .index = -1,
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- .data = &serial_m3110_reg,
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-};
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-
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-static unsigned int serial_m3110_tx_empty(struct uart_port *port)
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-{
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- return 1;
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-}
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-
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-static void serial_m3110_stop_tx(struct uart_port *port)
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-{
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- return;
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-}
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-
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-/* stop_rx will be called in spin_lock env */
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-static void serial_m3110_stop_rx(struct uart_port *port)
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-{
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- return;
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-}
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-
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-#define WORDS_PER_XFER 128
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-static void send_circ_buf(struct uart_max3110 *max,
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- struct circ_buf *xmit)
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-{
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- void *buf;
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- u16 *obuf, *ibuf;
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- int i, len, blen, dma_size, left, ret = 0;
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-
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-
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- dma_size = WORDS_PER_XFER * sizeof(u16) * 2;
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- buf = kzalloc(dma_size, GFP_KERNEL | GFP_DMA);
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- if (!buf)
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- return;
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- obuf = buf;
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- ibuf = buf + dma_size/2;
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-
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- while (!uart_circ_empty(xmit)) {
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- left = uart_circ_chars_pending(xmit);
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- while (left) {
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- len = min(left, WORDS_PER_XFER);
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- blen = len * sizeof(u16);
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- memset(ibuf, 0, blen);
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-
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- for (i = 0; i < len; i++) {
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- obuf[i] = (u8)xmit->buf[xmit->tail] | WD_TAG;
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- xmit->tail = (xmit->tail + 1) &
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- (UART_XMIT_SIZE - 1);
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- }
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-
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- /* Fail to send msg to console is not very critical */
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-
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- ret = max3110_write_then_read(max, obuf, ibuf, blen, 0);
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- if (ret)
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- pr_warn("%s: get err msg %d\n", __func__, ret);
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-
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- receive_chars(max, ibuf, len);
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-
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- max->port.icount.tx += len;
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- left -= len;
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- }
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- }
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-
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- kfree(buf);
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-}
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-
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-static void transmit_char(struct uart_max3110 *max)
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-{
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- struct uart_port *port = &max->port;
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- struct circ_buf *xmit = &port->state->xmit;
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-
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- if (uart_circ_empty(xmit) || uart_tx_stopped(port))
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- return;
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-
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- send_circ_buf(max, xmit);
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-
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- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
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- uart_write_wakeup(port);
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-
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- if (uart_circ_empty(xmit))
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- serial_m3110_stop_tx(port);
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-}
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-
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-/*
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- * This will be called by uart_write() and tty_write, can't
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- * go to sleep
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- */
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-static void serial_m3110_start_tx(struct uart_port *port)
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-{
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- struct uart_max3110 *max =
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- container_of(port, struct uart_max3110, port);
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-
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- if (!test_and_set_bit(UART_TX_NEEDED, &max->uart_flags))
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- wake_up(&max->wq);
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-}
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-
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-static int
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-receive_chars(struct uart_max3110 *max, unsigned short *str, int len)
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-{
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- struct uart_port *port = &max->port;
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- struct tty_port *tport;
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- char buf[M3110_RX_FIFO_DEPTH];
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- int r, w, usable;
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-
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- /* If uart is not opened, just return */
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- if (!port->state)
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- return 0;
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-
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- tport = &port->state->port;
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-
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- for (r = 0, w = 0; r < len; r++) {
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- if (str[r] & MAX3110_BREAK &&
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- uart_handle_break(port))
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- continue;
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-
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- if (str[r] & MAX3110_READ_DATA_AVAILABLE) {
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- if (uart_handle_sysrq_char(port, str[r] & 0xff))
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- continue;
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-
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- buf[w++] = str[r] & 0xff;
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- }
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- }
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-
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- if (!w)
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- return 0;
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-
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- for (r = 0; w; r += usable, w -= usable) {
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- usable = tty_buffer_request_room(tport, w);
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- if (usable) {
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- tty_insert_flip_string(tport, buf + r, usable);
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- port->icount.rx += usable;
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- }
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- }
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- tty_flip_buffer_push(tport);
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-
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- return r;
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-}
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-
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-/*
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- * This routine will be used in read_thread or RX IRQ handling,
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- * it will first do one round buffer read(8 words), if there is some
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- * valid RX data, will try to read 5 more rounds till all data
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- * is read out.
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- *
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- * Use stack space as data buffer to save some system load, and chose
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- * 504 Btyes as a threadhold to do a bulk push to upper tty layer when
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- * receiving bulk data, a much bigger buffer may cause stack overflow
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- */
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-static void max3110_con_receive(struct uart_max3110 *max)
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-{
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- int loop = 1, num;
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-
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- do {
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- num = max3110_read_multi(max);
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-
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- if (num) {
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- loop = 5;
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- }
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- } while (--loop);
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-}
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-
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-static int max3110_main_thread(void *_max)
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-{
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- struct uart_max3110 *max = _max;
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- wait_queue_head_t *wq = &max->wq;
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- int ret = 0;
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- struct circ_buf *xmit = &max->con_xmit;
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-
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- pr_info("start main thread\n");
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-
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- do {
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- wait_event_interruptible(*wq,
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- max->uart_flags || kthread_should_stop());
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-
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- mutex_lock(&max->thread_mutex);
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-
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- if (test_and_clear_bit(BIT_IRQ_PENDING, &max->uart_flags))
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- max3110_con_receive(max);
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-
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|
|
- /* first handle console output */
|
|
|
- if (test_and_clear_bit(CON_TX_NEEDED, &max->uart_flags))
|
|
|
- send_circ_buf(max, xmit);
|
|
|
-
|
|
|
- /* handle uart output */
|
|
|
- if (test_and_clear_bit(UART_TX_NEEDED, &max->uart_flags))
|
|
|
- transmit_char(max);
|
|
|
-
|
|
|
- mutex_unlock(&max->thread_mutex);
|
|
|
-
|
|
|
- } while (!kthread_should_stop());
|
|
|
-
|
|
|
- return ret;
|
|
|
-}
|
|
|
-
|
|
|
-static irqreturn_t serial_m3110_irq(int irq, void *dev_id)
|
|
|
-{
|
|
|
- struct uart_max3110 *max = dev_id;
|
|
|
-
|
|
|
- /* max3110's irq is a falling edge, not level triggered,
|
|
|
- * so no need to disable the irq */
|
|
|
-
|
|
|
- if (!test_and_set_bit(BIT_IRQ_PENDING, &max->uart_flags))
|
|
|
- wake_up(&max->wq);
|
|
|
-
|
|
|
- return IRQ_HANDLED;
|
|
|
-}
|
|
|
-
|
|
|
-/* if don't use RX IRQ, then need a thread to polling read */
|
|
|
-static int max3110_read_thread(void *_max)
|
|
|
-{
|
|
|
- struct uart_max3110 *max = _max;
|
|
|
-
|
|
|
- pr_info("start read thread\n");
|
|
|
- do {
|
|
|
- /*
|
|
|
- * If can't acquire the mutex, it means the main thread
|
|
|
- * is running which will also perform the rx job
|
|
|
- */
|
|
|
- if (mutex_trylock(&max->thread_mutex)) {
|
|
|
- max3110_con_receive(max);
|
|
|
- mutex_unlock(&max->thread_mutex);
|
|
|
- }
|
|
|
-
|
|
|
- set_current_state(TASK_INTERRUPTIBLE);
|
|
|
- schedule_timeout(HZ / 20);
|
|
|
- } while (!kthread_should_stop());
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-static int serial_m3110_startup(struct uart_port *port)
|
|
|
-{
|
|
|
- struct uart_max3110 *max =
|
|
|
- container_of(port, struct uart_max3110, port);
|
|
|
- u16 config = 0;
|
|
|
- int ret = 0;
|
|
|
-
|
|
|
- if (port->line != 0) {
|
|
|
- pr_err("uart port startup failed\n");
|
|
|
- return -1;
|
|
|
- }
|
|
|
-
|
|
|
- /* Disable all IRQ and config it to 115200, 8n1 */
|
|
|
- config = WC_TAG | WC_FIFO_ENABLE
|
|
|
- | WC_1_STOPBITS
|
|
|
- | WC_8BIT_WORD
|
|
|
- | WC_BAUD_DR2;
|
|
|
-
|
|
|
- /* as we use thread to handle tx/rx, need set low latency */
|
|
|
- port->state->port.low_latency = 1;
|
|
|
-
|
|
|
- if (max->irq) {
|
|
|
- /* Enable RX IRQ only */
|
|
|
- config |= WC_RXA_IRQ_ENABLE;
|
|
|
- } else {
|
|
|
- /* If IRQ is disabled, start a read thread for input data */
|
|
|
- max->read_thread =
|
|
|
- kthread_run(max3110_read_thread, max, "max3110_read");
|
|
|
- if (IS_ERR(max->read_thread)) {
|
|
|
- ret = PTR_ERR(max->read_thread);
|
|
|
- max->read_thread = NULL;
|
|
|
- pr_err("Can't create read thread!\n");
|
|
|
- return ret;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- ret = max3110_out(max, config);
|
|
|
- if (ret) {
|
|
|
- if (max->read_thread)
|
|
|
- kthread_stop(max->read_thread);
|
|
|
- max->read_thread = NULL;
|
|
|
- return ret;
|
|
|
- }
|
|
|
-
|
|
|
- max->cur_conf = config;
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-static void serial_m3110_shutdown(struct uart_port *port)
|
|
|
-{
|
|
|
- struct uart_max3110 *max =
|
|
|
- container_of(port, struct uart_max3110, port);
|
|
|
- u16 config;
|
|
|
-
|
|
|
- if (max->read_thread) {
|
|
|
- kthread_stop(max->read_thread);
|
|
|
- max->read_thread = NULL;
|
|
|
- }
|
|
|
-
|
|
|
- /* Disable interrupts from this port */
|
|
|
- config = WC_TAG | WC_SW_SHDI;
|
|
|
- max3110_out(max, config);
|
|
|
-}
|
|
|
-
|
|
|
-static void serial_m3110_release_port(struct uart_port *port)
|
|
|
-{
|
|
|
-}
|
|
|
-
|
|
|
-static int serial_m3110_request_port(struct uart_port *port)
|
|
|
-{
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-static void serial_m3110_config_port(struct uart_port *port, int flags)
|
|
|
-{
|
|
|
- port->type = PORT_MAX3100;
|
|
|
-}
|
|
|
-
|
|
|
-static int
|
|
|
-serial_m3110_verify_port(struct uart_port *port, struct serial_struct *ser)
|
|
|
-{
|
|
|
- /* we don't want the core code to modify any port params */
|
|
|
- return -EINVAL;
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-static const char *serial_m3110_type(struct uart_port *port)
|
|
|
-{
|
|
|
- struct uart_max3110 *max =
|
|
|
- container_of(port, struct uart_max3110, port);
|
|
|
- return max->name;
|
|
|
-}
|
|
|
-
|
|
|
-static void
|
|
|
-serial_m3110_set_termios(struct uart_port *port, struct ktermios *termios,
|
|
|
- struct ktermios *old)
|
|
|
-{
|
|
|
- struct uart_max3110 *max =
|
|
|
- container_of(port, struct uart_max3110, port);
|
|
|
- unsigned char cval;
|
|
|
- unsigned int baud, parity = 0;
|
|
|
- int clk_div = -1;
|
|
|
- u16 new_conf = max->cur_conf;
|
|
|
-
|
|
|
- switch (termios->c_cflag & CSIZE) {
|
|
|
- case CS7:
|
|
|
- cval = UART_LCR_WLEN7;
|
|
|
- new_conf |= WC_7BIT_WORD;
|
|
|
- break;
|
|
|
- default:
|
|
|
- /* We only support CS7 & CS8 */
|
|
|
- termios->c_cflag &= ~CSIZE;
|
|
|
- termios->c_cflag |= CS8;
|
|
|
- case CS8:
|
|
|
- cval = UART_LCR_WLEN8;
|
|
|
- new_conf |= WC_8BIT_WORD;
|
|
|
- break;
|
|
|
- }
|
|
|
-
|
|
|
- baud = uart_get_baud_rate(port, termios, old, 0, 230400);
|
|
|
-
|
|
|
- /* First calc the div for 1.8MHZ clock case */
|
|
|
- switch (baud) {
|
|
|
- case 300:
|
|
|
- clk_div = WC_BAUD_DR384;
|
|
|
- break;
|
|
|
- case 600:
|
|
|
- clk_div = WC_BAUD_DR192;
|
|
|
- break;
|
|
|
- case 1200:
|
|
|
- clk_div = WC_BAUD_DR96;
|
|
|
- break;
|
|
|
- case 2400:
|
|
|
- clk_div = WC_BAUD_DR48;
|
|
|
- break;
|
|
|
- case 4800:
|
|
|
- clk_div = WC_BAUD_DR24;
|
|
|
- break;
|
|
|
- case 9600:
|
|
|
- clk_div = WC_BAUD_DR12;
|
|
|
- break;
|
|
|
- case 19200:
|
|
|
- clk_div = WC_BAUD_DR6;
|
|
|
- break;
|
|
|
- case 38400:
|
|
|
- clk_div = WC_BAUD_DR3;
|
|
|
- break;
|
|
|
- case 57600:
|
|
|
- clk_div = WC_BAUD_DR2;
|
|
|
- break;
|
|
|
- case 115200:
|
|
|
- clk_div = WC_BAUD_DR1;
|
|
|
- break;
|
|
|
- case 230400:
|
|
|
- if (max->clock & MAX3110_HIGH_CLK)
|
|
|
- break;
|
|
|
- default:
|
|
|
- /* Pick the previous baud rate */
|
|
|
- baud = max->baud;
|
|
|
- clk_div = max->cur_conf & WC_BAUD_DIV_MASK;
|
|
|
- tty_termios_encode_baud_rate(termios, baud, baud);
|
|
|
- }
|
|
|
-
|
|
|
- if (max->clock & MAX3110_HIGH_CLK) {
|
|
|
- clk_div += 1;
|
|
|
- /* High clk version max3110 doesn't support B300 */
|
|
|
- if (baud == 300) {
|
|
|
- baud = 600;
|
|
|
- clk_div = WC_BAUD_DR384;
|
|
|
- }
|
|
|
- if (baud == 230400)
|
|
|
- clk_div = WC_BAUD_DR1;
|
|
|
- tty_termios_encode_baud_rate(termios, baud, baud);
|
|
|
- }
|
|
|
-
|
|
|
- new_conf = (new_conf & ~WC_BAUD_DIV_MASK) | clk_div;
|
|
|
-
|
|
|
- if (unlikely(termios->c_cflag & CMSPAR))
|
|
|
- termios->c_cflag &= ~CMSPAR;
|
|
|
-
|
|
|
- if (termios->c_cflag & CSTOPB)
|
|
|
- new_conf |= WC_2_STOPBITS;
|
|
|
- else
|
|
|
- new_conf &= ~WC_2_STOPBITS;
|
|
|
-
|
|
|
- if (termios->c_cflag & PARENB) {
|
|
|
- new_conf |= WC_PARITY_ENABLE;
|
|
|
- parity |= UART_LCR_PARITY;
|
|
|
- } else
|
|
|
- new_conf &= ~WC_PARITY_ENABLE;
|
|
|
-
|
|
|
- if (!(termios->c_cflag & PARODD))
|
|
|
- parity |= UART_LCR_EPAR;
|
|
|
- max->parity = parity;
|
|
|
-
|
|
|
- uart_update_timeout(port, termios->c_cflag, baud);
|
|
|
-
|
|
|
- new_conf |= WC_TAG;
|
|
|
- if (new_conf != max->cur_conf) {
|
|
|
- if (!max3110_out(max, new_conf)) {
|
|
|
- max->cur_conf = new_conf;
|
|
|
- max->baud = baud;
|
|
|
- }
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-/* Don't handle hw handshaking */
|
|
|
-static unsigned int serial_m3110_get_mctrl(struct uart_port *port)
|
|
|
-{
|
|
|
- return TIOCM_DSR | TIOCM_CAR | TIOCM_DSR;
|
|
|
-}
|
|
|
-
|
|
|
-static void serial_m3110_set_mctrl(struct uart_port *port, unsigned int mctrl)
|
|
|
-{
|
|
|
-}
|
|
|
-
|
|
|
-static void serial_m3110_break_ctl(struct uart_port *port, int break_state)
|
|
|
-{
|
|
|
-}
|
|
|
-
|
|
|
-static void serial_m3110_pm(struct uart_port *port, unsigned int state,
|
|
|
- unsigned int oldstate)
|
|
|
-{
|
|
|
-}
|
|
|
-
|
|
|
-static struct uart_ops serial_m3110_ops = {
|
|
|
- .tx_empty = serial_m3110_tx_empty,
|
|
|
- .set_mctrl = serial_m3110_set_mctrl,
|
|
|
- .get_mctrl = serial_m3110_get_mctrl,
|
|
|
- .stop_tx = serial_m3110_stop_tx,
|
|
|
- .start_tx = serial_m3110_start_tx,
|
|
|
- .stop_rx = serial_m3110_stop_rx,
|
|
|
- .break_ctl = serial_m3110_break_ctl,
|
|
|
- .startup = serial_m3110_startup,
|
|
|
- .shutdown = serial_m3110_shutdown,
|
|
|
- .set_termios = serial_m3110_set_termios,
|
|
|
- .pm = serial_m3110_pm,
|
|
|
- .type = serial_m3110_type,
|
|
|
- .release_port = serial_m3110_release_port,
|
|
|
- .request_port = serial_m3110_request_port,
|
|
|
- .config_port = serial_m3110_config_port,
|
|
|
- .verify_port = serial_m3110_verify_port,
|
|
|
-};
|
|
|
-
|
|
|
-static struct uart_driver serial_m3110_reg = {
|
|
|
- .owner = THIS_MODULE,
|
|
|
- .driver_name = "MRST serial",
|
|
|
- .dev_name = "ttyS",
|
|
|
- .major = TTY_MAJOR,
|
|
|
- .minor = 64,
|
|
|
- .nr = 1,
|
|
|
- .cons = &serial_m3110_console,
|
|
|
-};
|
|
|
-
|
|
|
-#ifdef CONFIG_PM_SLEEP
|
|
|
-static int serial_m3110_suspend(struct device *dev)
|
|
|
-{
|
|
|
- struct spi_device *spi = to_spi_device(dev);
|
|
|
- struct uart_max3110 *max = spi_get_drvdata(spi);
|
|
|
-
|
|
|
- if (max->irq > 0)
|
|
|
- disable_irq(max->irq);
|
|
|
- uart_suspend_port(&serial_m3110_reg, &max->port);
|
|
|
- max3110_out(max, max->cur_conf | WC_SW_SHDI);
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-static int serial_m3110_resume(struct device *dev)
|
|
|
-{
|
|
|
- struct spi_device *spi = to_spi_device(dev);
|
|
|
- struct uart_max3110 *max = spi_get_drvdata(spi);
|
|
|
-
|
|
|
- max3110_out(max, max->cur_conf);
|
|
|
- uart_resume_port(&serial_m3110_reg, &max->port);
|
|
|
- if (max->irq > 0)
|
|
|
- enable_irq(max->irq);
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-static SIMPLE_DEV_PM_OPS(serial_m3110_pm_ops, serial_m3110_suspend,
|
|
|
- serial_m3110_resume);
|
|
|
-#define SERIAL_M3110_PM_OPS (&serial_m3110_pm_ops)
|
|
|
-
|
|
|
-#else
|
|
|
-#define SERIAL_M3110_PM_OPS NULL
|
|
|
-#endif
|
|
|
-
|
|
|
-static int serial_m3110_probe(struct spi_device *spi)
|
|
|
-{
|
|
|
- struct uart_max3110 *max;
|
|
|
- void *buffer;
|
|
|
- u16 res;
|
|
|
- int ret = 0;
|
|
|
-
|
|
|
- max = kzalloc(sizeof(*max), GFP_KERNEL);
|
|
|
- if (!max)
|
|
|
- return -ENOMEM;
|
|
|
-
|
|
|
- /* Set spi info */
|
|
|
- spi->bits_per_word = 16;
|
|
|
- max->clock = MAX3110_HIGH_CLK;
|
|
|
-
|
|
|
- spi_setup(spi);
|
|
|
-
|
|
|
- max->port.type = PORT_MAX3100;
|
|
|
- max->port.fifosize = 2; /* Only have 16b buffer */
|
|
|
- max->port.ops = &serial_m3110_ops;
|
|
|
- max->port.line = 0;
|
|
|
- max->port.dev = &spi->dev;
|
|
|
- max->port.uartclk = 115200;
|
|
|
-
|
|
|
- max->spi = spi;
|
|
|
- strcpy(max->name, spi->modalias);
|
|
|
- max->irq = (u16)spi->irq;
|
|
|
-
|
|
|
- mutex_init(&max->thread_mutex);
|
|
|
- mutex_init(&max->io_mutex);
|
|
|
-
|
|
|
- max->word_7bits = 0;
|
|
|
- max->parity = 0;
|
|
|
- max->baud = 0;
|
|
|
-
|
|
|
- max->cur_conf = 0;
|
|
|
- max->uart_flags = 0;
|
|
|
-
|
|
|
- /* Check if reading configuration register returns something sane */
|
|
|
-
|
|
|
- res = RC_TAG;
|
|
|
- ret = max3110_write_then_read(max, (u8 *)&res, (u8 *)&res, 2, 0);
|
|
|
- if (ret < 0 || res == 0 || res == 0xffff) {
|
|
|
- dev_dbg(&spi->dev, "MAX3111 deemed not present (conf reg %04x)",
|
|
|
- res);
|
|
|
- ret = -ENODEV;
|
|
|
- goto err_get_page;
|
|
|
- }
|
|
|
-
|
|
|
- buffer = (void *)__get_free_page(GFP_KERNEL);
|
|
|
- if (!buffer) {
|
|
|
- ret = -ENOMEM;
|
|
|
- goto err_get_page;
|
|
|
- }
|
|
|
- max->con_xmit.buf = buffer;
|
|
|
- max->con_xmit.head = 0;
|
|
|
- max->con_xmit.tail = 0;
|
|
|
-
|
|
|
- init_waitqueue_head(&max->wq);
|
|
|
-
|
|
|
- max->main_thread = kthread_run(max3110_main_thread,
|
|
|
- max, "max3110_main");
|
|
|
- if (IS_ERR(max->main_thread)) {
|
|
|
- ret = PTR_ERR(max->main_thread);
|
|
|
- goto err_kthread;
|
|
|
- }
|
|
|
-
|
|
|
- if (max->irq) {
|
|
|
- ret = request_irq(max->irq, serial_m3110_irq,
|
|
|
- IRQ_TYPE_EDGE_FALLING, "max3110", max);
|
|
|
- if (ret) {
|
|
|
- max->irq = 0;
|
|
|
- dev_warn(&spi->dev,
|
|
|
- "unable to allocate IRQ, will use polling method\n");
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- spi_set_drvdata(spi, max);
|
|
|
- pmax = max;
|
|
|
-
|
|
|
- /* Give membase a psudo value to pass serial_core's check */
|
|
|
- max->port.membase = (unsigned char __iomem *)0xff110000;
|
|
|
- uart_add_one_port(&serial_m3110_reg, &max->port);
|
|
|
-
|
|
|
- return 0;
|
|
|
-
|
|
|
-err_kthread:
|
|
|
- free_page((unsigned long)buffer);
|
|
|
-err_get_page:
|
|
|
- kfree(max);
|
|
|
- return ret;
|
|
|
-}
|
|
|
-
|
|
|
-static int serial_m3110_remove(struct spi_device *dev)
|
|
|
-{
|
|
|
- struct uart_max3110 *max = spi_get_drvdata(dev);
|
|
|
-
|
|
|
- if (!max)
|
|
|
- return 0;
|
|
|
-
|
|
|
- uart_remove_one_port(&serial_m3110_reg, &max->port);
|
|
|
-
|
|
|
- free_page((unsigned long)max->con_xmit.buf);
|
|
|
-
|
|
|
- if (max->irq)
|
|
|
- free_irq(max->irq, max);
|
|
|
-
|
|
|
- if (max->main_thread)
|
|
|
- kthread_stop(max->main_thread);
|
|
|
-
|
|
|
- kfree(max);
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-static struct spi_driver uart_max3110_driver = {
|
|
|
- .driver = {
|
|
|
- .name = "spi_max3111",
|
|
|
- .owner = THIS_MODULE,
|
|
|
- .pm = SERIAL_M3110_PM_OPS,
|
|
|
- },
|
|
|
- .probe = serial_m3110_probe,
|
|
|
- .remove = serial_m3110_remove,
|
|
|
-};
|
|
|
-
|
|
|
-static int __init serial_m3110_init(void)
|
|
|
-{
|
|
|
- int ret = 0;
|
|
|
-
|
|
|
- ret = uart_register_driver(&serial_m3110_reg);
|
|
|
- if (ret)
|
|
|
- return ret;
|
|
|
-
|
|
|
- ret = spi_register_driver(&uart_max3110_driver);
|
|
|
- if (ret)
|
|
|
- uart_unregister_driver(&serial_m3110_reg);
|
|
|
-
|
|
|
- return ret;
|
|
|
-}
|
|
|
-
|
|
|
-static void __exit serial_m3110_exit(void)
|
|
|
-{
|
|
|
- spi_unregister_driver(&uart_max3110_driver);
|
|
|
- uart_unregister_driver(&serial_m3110_reg);
|
|
|
-}
|
|
|
-
|
|
|
-module_init(serial_m3110_init);
|
|
|
-module_exit(serial_m3110_exit);
|
|
|
-
|
|
|
-MODULE_LICENSE("GPL v2");
|
|
|
-MODULE_ALIAS("spi:max3110-uart");
|
Andy Shevchenko