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https://github.com/joel16/android_kernel_sony_msm8994_rework.git
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[PATCH] jsm: update for tty buffering revamp
Signed-off-by: V. Ananda Krishnan <mansarov@us.ibm.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
V. Ananda Krishnan
Linus Torvalds
parent
7d95c8f27d
commit
0a577ce34f
@ -892,20 +892,20 @@ config SERIAL_VR41XX_CONSOLE
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a console on a serial port, say Y. Otherwise, say N.
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config SERIAL_JSM
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tristate "Digi International NEO PCI Support"
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depends on PCI && BROKEN
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select SERIAL_CORE
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help
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This is a driver for Digi International's Neo series
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of cards which provide multiple serial ports. You would need
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something like this to connect more than two modems to your Linux
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box, for instance in order to become a dial-in server. This driver
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supports PCI boards only.
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If you have a card like this, say Y here and read the file
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<file:Documentation/jsm.txt>.
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tristate "Digi International NEO PCI Support"
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depends on PCI
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select SERIAL_CORE
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help
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This is a driver for Digi International's Neo series
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of cards which provide multiple serial ports. You would need
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something like this to connect more than two modems to your Linux
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box, for instance in order to become a dial-in server. This driver
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supports PCI boards only.
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If you have a card like this, say Y here and read the file
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<file:Documentation/jsm.txt>.
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To compile this driver as a module, choose M here: the
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module will be called jsm.
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To compile this driver as a module, choose M here: the
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module will be called jsm.
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config SERIAL_SGI_IOC4
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tristate "SGI IOC4 controller serial support"
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@ -20,8 +20,10 @@
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*
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* Contact Information:
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* Scott H Kilau <Scott_Kilau@digi.com>
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* Wendy Xiong <wendyx@us.ltcfwd.linux.ibm.com>
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*
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* Ananda Venkatarman <mansarov@us.ibm.com>
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* Modifications:
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* 01/19/06: changed jsm_input routine to use the dynamically allocated
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* tty_buffer changes. Contributors: Scott Kilau and Ananda V.
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***********************************************************************/
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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@ -497,16 +499,16 @@ void jsm_input(struct jsm_channel *ch)
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{
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struct jsm_board *bd;
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struct tty_struct *tp;
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struct tty_ldisc *ld;
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u32 rmask;
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u16 head;
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u16 tail;
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int data_len;
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unsigned long lock_flags;
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int flip_len;
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int flip_len = 0;
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int len = 0;
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int n = 0;
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char *buf = NULL;
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char *buf2 = NULL;
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int s = 0;
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int i = 0;
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@ -574,56 +576,50 @@ void jsm_input(struct jsm_channel *ch)
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/*
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* If the rxbuf is empty and we are not throttled, put as much
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* as we can directly into the linux TTY flip buffer.
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* The jsm_rawreadok case takes advantage of carnal knowledge that
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* the char_buf and the flag_buf are next to each other and
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* are each of (2 * TTY_FLIPBUF_SIZE) size.
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* as we can directly into the linux TTY buffer.
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*
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* NOTE: if(!tty->real_raw), the call to ldisc.receive_buf
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*actually still uses the flag buffer, so you can't
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*use it for input data
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*/
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if (jsm_rawreadok) {
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if (tp->real_raw)
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flip_len = MYFLIPLEN;
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else
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flip_len = 2 * TTY_FLIPBUF_SIZE;
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} else
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flip_len = TTY_FLIPBUF_SIZE - tp->flip.count;
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flip_len = TTY_FLIPBUF_SIZE;
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len = min(data_len, flip_len);
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len = min(len, (N_TTY_BUF_SIZE - 1) - tp->read_cnt);
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ld = tty_ldisc_ref(tp);
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/*
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* If the DONT_FLIP flag is on, don't flush our buffer, and act
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* like the ld doesn't have any space to put the data right now.
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*/
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if (test_bit(TTY_DONT_FLIP, &tp->flags))
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len = 0;
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/*
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* If we were unable to get a reference to the ld,
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* don't flush our buffer, and act like the ld doesn't
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* have any space to put the data right now.
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*/
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if (!ld) {
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len = 0;
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} else {
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/*
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* If ld doesn't have a pointer to a receive_buf function,
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* flush the data, then act like the ld doesn't have any
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* space to put the data right now.
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*/
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if (!ld->receive_buf) {
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ch->ch_r_head = ch->ch_r_tail;
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len = 0;
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}
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}
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if (len <= 0) {
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spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
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jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "jsm_input 1\n");
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if (ld)
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tty_ldisc_deref(ld);
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return;
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}
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/*
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* If we're bypassing flip buffers on rx, we can blast it
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* right into the beginning of the buffer.
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*/
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if (jsm_rawreadok) {
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if (tp->real_raw) {
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if (ch->ch_flags & CH_FLIPBUF_IN_USE) {
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jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
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"JSM - FLIPBUF in use. delaying input\n");
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spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
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return;
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}
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ch->ch_flags |= CH_FLIPBUF_IN_USE;
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buf = ch->ch_bd->flipbuf;
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buf2 = NULL;
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} else {
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buf = tp->flip.char_buf;
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buf2 = tp->flip.flag_buf;
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}
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} else {
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buf = tp->flip.char_buf_ptr;
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buf2 = tp->flip.flag_buf_ptr;
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}
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len = tty_buffer_request_room(tp, len);
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n = len;
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/*
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@ -638,121 +634,47 @@ void jsm_input(struct jsm_channel *ch)
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if (s <= 0)
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break;
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memcpy(buf, ch->ch_rqueue + tail, s);
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/* buf2 is only set when port isn't raw */
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if (buf2)
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memcpy(buf2, ch->ch_equeue + tail, s);
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/*
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* If conditions are such that ld needs to see all
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* UART errors, we will have to walk each character
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* and error byte and send them to the buffer one at
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* a time.
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*/
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if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) {
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for (i = 0; i < s; i++) {
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/*
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* Give the Linux ld the flags in the
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* format it likes.
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*/
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if (*(ch->ch_equeue +tail +i) & UART_LSR_BI)
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tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_BREAK);
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else if (*(ch->ch_equeue +tail +i) & UART_LSR_PE)
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tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_PARITY);
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else if (*(ch->ch_equeue +tail +i) & UART_LSR_FE)
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tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_FRAME);
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else
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tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_NORMAL);
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}
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} else {
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tty_insert_flip_string(tp, ch->ch_rqueue + tail, s) ;
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}
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tail += s;
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buf += s;
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if (buf2)
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buf2 += s;
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n -= s;
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/* Flip queue if needed */
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tail &= rmask;
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}
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/*
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* In high performance mode, we don't have to update
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* flag_buf or any of the counts or pointers into flip buf.
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*/
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if (!jsm_rawreadok) {
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if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) {
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for (i = 0; i < len; i++) {
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/*
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* Give the Linux ld the flags in the
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* format it likes.
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*/
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if (tp->flip.flag_buf_ptr[i] & UART_LSR_BI)
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tp->flip.flag_buf_ptr[i] = TTY_BREAK;
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else if (tp->flip.flag_buf_ptr[i] & UART_LSR_PE)
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tp->flip.flag_buf_ptr[i] = TTY_PARITY;
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else if (tp->flip.flag_buf_ptr[i] & UART_LSR_FE)
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tp->flip.flag_buf_ptr[i] = TTY_FRAME;
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else
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tp->flip.flag_buf_ptr[i] = TTY_NORMAL;
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}
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} else {
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memset(tp->flip.flag_buf_ptr, 0, len);
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}
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ch->ch_r_tail = tail & rmask;
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ch->ch_e_tail = tail & rmask;
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jsm_check_queue_flow_control(ch);
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spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
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tp->flip.char_buf_ptr += len;
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tp->flip.flag_buf_ptr += len;
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tp->flip.count += len;
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}
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else if (!tp->real_raw) {
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if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) {
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for (i = 0; i < len; i++) {
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/*
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* Give the Linux ld the flags in the
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* format it likes.
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*/
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if (tp->flip.flag_buf_ptr[i] & UART_LSR_BI)
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tp->flip.flag_buf_ptr[i] = TTY_BREAK;
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else if (tp->flip.flag_buf_ptr[i] & UART_LSR_PE)
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tp->flip.flag_buf_ptr[i] = TTY_PARITY;
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else if (tp->flip.flag_buf_ptr[i] & UART_LSR_FE)
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tp->flip.flag_buf_ptr[i] = TTY_FRAME;
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else
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tp->flip.flag_buf_ptr[i] = TTY_NORMAL;
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}
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} else
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memset(tp->flip.flag_buf, 0, len);
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}
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/* Tell the tty layer its okay to "eat" the data now */
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tty_flip_buffer_push(tp);
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/*
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* If we're doing raw reads, jam it right into the
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* line disc bypassing the flip buffers.
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*/
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if (jsm_rawreadok) {
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if (tp->real_raw) {
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ch->ch_r_tail = tail & rmask;
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ch->ch_e_tail = tail & rmask;
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jsm_check_queue_flow_control(ch);
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/* !!! WE *MUST* LET GO OF ALL LOCKS BEFORE CALLING RECEIVE BUF !!! */
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spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
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jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
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"jsm_input. %d real_raw len:%d calling receive_buf for board %d\n",
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__LINE__, len, ch->ch_bd->boardnum);
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tp->ldisc.receive_buf(tp, ch->ch_bd->flipbuf, NULL, len);
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/* Allow use of channel flip buffer again */
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spin_lock_irqsave(&ch->ch_lock, lock_flags);
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ch->ch_flags &= ~CH_FLIPBUF_IN_USE;
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spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
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} else {
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ch->ch_r_tail = tail & rmask;
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ch->ch_e_tail = tail & rmask;
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jsm_check_queue_flow_control(ch);
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/* !!! WE *MUST* LET GO OF ALL LOCKS BEFORE CALLING RECEIVE BUF !!! */
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spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
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jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
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"jsm_input. %d not real_raw len:%d calling receive_buf for board %d\n",
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__LINE__, len, ch->ch_bd->boardnum);
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tp->ldisc.receive_buf(tp, tp->flip.char_buf, tp->flip.flag_buf, len);
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}
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} else {
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ch->ch_r_tail = tail & rmask;
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ch->ch_e_tail = tail & rmask;
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jsm_check_queue_flow_control(ch);
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spin_unlock_irqrestore(&ch->ch_lock, lock_flags);
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jsm_printk(READ, INFO, &ch->ch_bd->pci_dev,
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"jsm_input. %d not jsm_read raw okay scheduling flip\n", __LINE__);
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tty_schedule_flip(tp);
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}
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if (ld)
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tty_ldisc_deref(ld);
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jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n");
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}
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