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Char: moxa, cleanup rx/tx
- cleanup types - use tty_prepare_flip_string and io memcpys Signed-off-by: Jiri Slaby <jirislaby@gmail.com> Tested-by: Oyvind Aabling <Oyvind.Aabling@uni-c.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jiri Slaby
Linus Torvalds
parent
7bcf97d1dd
commit
2108eba5c5
@ -224,7 +224,7 @@ static void MoxaPortLineCtrl(struct moxa_port *, int, int);
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static void MoxaPortFlowCtrl(struct moxa_port *, int, int, int, int, int);
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static int MoxaPortLineStatus(struct moxa_port *);
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static void MoxaPortFlushData(struct moxa_port *, int);
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static int MoxaPortWriteData(struct moxa_port *, unsigned char *, int);
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static int MoxaPortWriteData(struct moxa_port *, const unsigned char *, int);
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static int MoxaPortReadData(struct moxa_port *);
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static int MoxaPortTxQueue(struct moxa_port *);
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static int MoxaPortRxQueue(struct moxa_port *);
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@ -1165,7 +1165,7 @@ static int moxa_write(struct tty_struct *tty,
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return 0;
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spin_lock_bh(&moxa_lock);
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len = MoxaPortWriteData(ch, (unsigned char *) buf, count);
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len = MoxaPortWriteData(ch, buf, count);
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spin_unlock_bh(&moxa_lock);
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/*********************************************
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@ -2030,15 +2030,13 @@ static int MoxaPortLineStatus(struct moxa_port *port)
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return val;
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}
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static int MoxaPortWriteData(struct moxa_port *port, unsigned char *buffer,
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int len)
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static int MoxaPortWriteData(struct moxa_port *port,
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const unsigned char *buffer, int len)
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{
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int c, total, i;
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ushort tail;
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int cnt;
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ushort head, tx_mask, spage, epage;
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ushort pageno, pageofs, bufhead;
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void __iomem *baseAddr, *ofsAddr, *ofs;
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unsigned int c, total;
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u16 head, tail, tx_mask, spage, epage;
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u16 pageno, pageofs, bufhead;
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ofsAddr = port->tableAddr;
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baseAddr = port->board->basemem;
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@ -2047,8 +2045,7 @@ static int MoxaPortWriteData(struct moxa_port *port, unsigned char *buffer,
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epage = readw(ofsAddr + EndPage_txb);
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tail = readw(ofsAddr + TXwptr);
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head = readw(ofsAddr + TXrptr);
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c = (head > tail) ? (head - tail - 1)
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: (head - tail + tx_mask);
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c = (head > tail) ? (head - tail - 1) : (head - tail + tx_mask);
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if (c > len)
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c = len;
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moxaLog.txcnt[port->tty->index] += c;
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@ -2063,46 +2060,42 @@ static int MoxaPortWriteData(struct moxa_port *port, unsigned char *buffer,
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len = tx_mask + 1 - tail;
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len = (c > len) ? len : c;
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ofs = baseAddr + DynPage_addr + bufhead + tail;
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for (i = 0; i < len; i++)
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writeb(*buffer++, ofs + i);
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memcpy_toio(ofs, buffer, len);
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buffer += len;
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tail = (tail + len) & tx_mask;
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c -= len;
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}
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writew(tail, ofsAddr + TXwptr);
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} else {
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len = c;
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pageno = spage + (tail >> 13);
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pageofs = tail & Page_mask;
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do {
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cnt = Page_size - pageofs;
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if (cnt > c)
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cnt = c;
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c -= cnt;
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while (c > 0) {
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len = Page_size - pageofs;
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if (len > c)
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len = c;
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writeb(pageno, baseAddr + Control_reg);
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ofs = baseAddr + DynPage_addr + pageofs;
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for (i = 0; i < cnt; i++)
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writeb(*buffer++, ofs + i);
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if (c == 0) {
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writew((tail + len) & tx_mask, ofsAddr + TXwptr);
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break;
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}
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memcpy_toio(ofs, buffer, len);
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buffer += len;
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if (++pageno == epage)
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pageno = spage;
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pageofs = 0;
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} while (1);
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c -= len;
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}
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tail = (tail + total) & tx_mask;
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}
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writew(tail, ofsAddr + TXwptr);
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writeb(1, ofsAddr + CD180TXirq); /* start to send */
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return (total);
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return total;
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}
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static int MoxaPortReadData(struct moxa_port *port)
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{
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struct tty_struct *tty = port->tty;
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register ushort head, pageofs;
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int i, count, cnt, len, total, remain;
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ushort tail, rx_mask, spage, epage;
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ushort pageno, bufhead;
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unsigned char *dst;
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void __iomem *baseAddr, *ofsAddr, *ofs;
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unsigned int count, len, total;
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u16 tail, rx_mask, spage, epage;
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u16 pageno, pageofs, bufhead, head;
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ofsAddr = port->tableAddr;
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baseAddr = port->board->basemem;
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@ -2111,101 +2104,84 @@ static int MoxaPortReadData(struct moxa_port *port)
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rx_mask = readw(ofsAddr + RX_mask);
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spage = readw(ofsAddr + Page_rxb);
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epage = readw(ofsAddr + EndPage_rxb);
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count = (tail >= head) ? (tail - head)
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: (tail - head + rx_mask + 1);
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count = (tail >= head) ? (tail - head) : (tail - head + rx_mask + 1);
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if (count == 0)
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return 0;
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total = count;
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remain = count - total;
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moxaLog.rxcnt[tty->index] += total;
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count = total;
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if (spage == epage) {
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bufhead = readw(ofsAddr + Ofs_rxb);
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writew(spage, baseAddr + Control_reg);
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while (count > 0) {
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if (tail >= head)
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len = tail - head;
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else
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len = rx_mask + 1 - head;
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len = (count > len) ? len : count;
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ofs = baseAddr + DynPage_addr + bufhead + head;
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for (i = 0; i < len; i++)
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tty_insert_flip_char(tty, readb(ofs + i), TTY_NORMAL);
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len = (tail >= head) ? (tail - head) :
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(rx_mask + 1 - head);
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len = tty_prepare_flip_string(tty, &dst,
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min(len, count));
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memcpy_fromio(dst, ofs, len);
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head = (head + len) & rx_mask;
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count -= len;
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}
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writew(head, ofsAddr + RXrptr);
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} else {
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len = count;
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pageno = spage + (head >> 13);
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pageofs = head & Page_mask;
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do {
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cnt = Page_size - pageofs;
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if (cnt > count)
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cnt = count;
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count -= cnt;
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while (count > 0) {
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writew(pageno, baseAddr + Control_reg);
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ofs = baseAddr + DynPage_addr + pageofs;
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for (i = 0; i < cnt; i++)
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tty_insert_flip_char(tty, readb(ofs + i), TTY_NORMAL);
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if (count == 0) {
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writew((head + len) & rx_mask, ofsAddr + RXrptr);
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break;
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}
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if (++pageno == epage)
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len = tty_prepare_flip_string(tty, &dst,
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min(Page_size - pageofs, count));
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memcpy_fromio(dst, ofs, len);
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count -= len;
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pageofs = (pageofs + len) & Page_mask;
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if (pageofs == 0 && ++pageno == epage)
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pageno = spage;
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pageofs = 0;
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} while (1);
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}
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head = (head + total) & rx_mask;
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}
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if ((readb(ofsAddr + FlagStat) & Xoff_state) && (remain < LowWater)) {
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writew(head, ofsAddr + RXrptr);
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if (readb(ofsAddr + FlagStat) & Xoff_state) {
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moxaLowWaterChk = 1;
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port->lowChkFlag = 1;
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}
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return (total);
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return total;
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}
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static int MoxaPortTxQueue(struct moxa_port *port)
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{
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void __iomem *ofsAddr = port->tableAddr;
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ushort rptr, wptr, mask;
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int len;
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u16 rptr, wptr, mask;
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rptr = readw(ofsAddr + TXrptr);
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wptr = readw(ofsAddr + TXwptr);
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mask = readw(ofsAddr + TX_mask);
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len = (wptr - rptr) & mask;
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return (len);
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return (wptr - rptr) & mask;
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}
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static int MoxaPortTxFree(struct moxa_port *port)
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{
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void __iomem *ofsAddr = port->tableAddr;
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ushort rptr, wptr, mask;
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int len;
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u16 rptr, wptr, mask;
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rptr = readw(ofsAddr + TXrptr);
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wptr = readw(ofsAddr + TXwptr);
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mask = readw(ofsAddr + TX_mask);
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len = mask - ((wptr - rptr) & mask);
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return (len);
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return mask - ((wptr - rptr) & mask);
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}
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static int MoxaPortRxQueue(struct moxa_port *port)
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{
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void __iomem *ofsAddr = port->tableAddr;
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ushort rptr, wptr, mask;
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int len;
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u16 rptr, wptr, mask;
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rptr = readw(ofsAddr + RXrptr);
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wptr = readw(ofsAddr + RXwptr);
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mask = readw(ofsAddr + RX_mask);
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len = (wptr - rptr) & mask;
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return (len);
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return (wptr - rptr) & mask;
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}
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static void MoxaPortTxDisable(struct moxa_port *port)
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{
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moxafunc(port->tableAddr, FC_SetXoffState, Magic_code);
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@ -217,7 +217,7 @@
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#define C320p32rx_mask (C320p32rx_size - 1)
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#define C320p32tx_mask (C320p32tx_size - 1)
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#define Page_size 0x2000
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#define Page_size 0x2000U
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#define Page_mask (Page_size - 1)
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#define C218rx_spage 3
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#define C218tx_spage 4
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