[PATCH] epca iomem annotations + several missing readw()

[originally sent to Alan, he had no problems with it]

 - iomem pointers marked as such
 - several direct dereferencings of such pointers replaced with read[bw]().

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/char/epca.c b/drivers/char/epca.c
index 58d3738..407708a 100644 (file)
--- a/drivers/char/epca.c
+++ b/drivers/char/epca.c
@@ -534,7 +534,7 @@ static void shutdown(struct channel *ch)
 
        unsigned long flags;
        struct tty_struct *tty;
-       struct board_chan *bc;
+       struct board_chan __iomem *bc;
 
        if (!(ch->asyncflags & ASYNC_INITIALIZED)) 
                return;
@@ -618,7 +618,7 @@ static int pc_write(struct tty_struct * tty,
        struct channel *ch;
        unsigned long flags;
        int remain;
-       struct board_chan *bc;
+       struct board_chan __iomem *bc;
 
        /* ----------------------------------------------------------------
                pc_write is primarily called directly by the kernel routine
@@ -685,7 +685,7 @@ static int pc_write(struct tty_struct * tty,
                ------------------------------------------------------------------- */
 
                dataLen = min(bytesAvailable, dataLen);
-               memcpy(ch->txptr + head, buf, dataLen);
+               memcpy_toio(ch->txptr + head, buf, dataLen);
                buf += dataLen;
                head += dataLen;
                amountCopied += dataLen;
@@ -726,7 +726,7 @@ static int pc_write_room(struct tty_struct *tty)
        struct channel *ch;
        unsigned long flags;
        unsigned int head, tail;
-       struct board_chan *bc;
+       struct board_chan __iomem *bc;
 
        remain = 0;
 
@@ -773,7 +773,7 @@ static int pc_chars_in_buffer(struct tty_struct *tty)
        int remain;
        unsigned long flags;
        struct channel *ch;
-       struct board_chan *bc;
+       struct board_chan __iomem *bc;
 
        /* ---------------------------------------------------------
                verifyChannel returns the channel from the tty struct
@@ -830,7 +830,7 @@ static void pc_flush_buffer(struct tty_struct *tty)
        unsigned int tail;
        unsigned long flags;
        struct channel *ch;
-       struct board_chan *bc;
+       struct board_chan __iomem *bc;
        /* ---------------------------------------------------------
                verifyChannel returns the channel from the tty struct
                if it is valid.  This serves as a sanity check.
@@ -976,7 +976,7 @@ static int pc_open(struct tty_struct *tty, struct file * filp)
        struct channel *ch;
        unsigned long flags;
        int line, retval, boardnum;
-       struct board_chan *bc;
+       struct board_chan __iomem *bc;
        unsigned int head;
 
        line = tty->index;
@@ -1041,7 +1041,7 @@ static int pc_open(struct tty_struct *tty, struct file * filp)
        ch->statusflags = 0;
 
        /* Save boards current modem status */
-       ch->imodem = bc->mstat;
+       ch->imodem = readb(&bc->mstat);
 
        /* ----------------------------------------------------------------
           Set receive head and tail ptrs to each other.  This indicates
@@ -1399,10 +1399,10 @@ static void post_fep_init(unsigned int crd)
 { /* Begin post_fep_init */
 
        int i;
-       unsigned char *memaddr;
-       struct global_data *gd;
+       void __iomem *memaddr;
+       struct global_data __iomem *gd;
        struct board_info *bd;
-       struct board_chan *bc;
+       struct board_chan __iomem *bc;
        struct channel *ch; 
        int shrinkmem = 0, lowwater ; 
  
@@ -1461,7 +1461,7 @@ static void post_fep_init(unsigned int crd)
                8 and 64 of these structures.
        -------------------------------------------------------------------- */
 
-       bc = (struct board_chan *)(memaddr + CHANSTRUCT);
+       bc = memaddr + CHANSTRUCT;
 
        /* -------------------------------------------------------------------
                The below assignment will set gd to point at the BEGINING of
@@ -1470,7 +1470,7 @@ static void post_fep_init(unsigned int crd)
                pointer begins at 0xd10.
        ---------------------------------------------------------------------- */
 
-       gd = (struct global_data *)(memaddr + GLOBAL);
+       gd = memaddr + GLOBAL;
 
        /* --------------------------------------------------------------------
                XEPORTS (address 0xc22) points at the number of channels the
@@ -1493,6 +1493,7 @@ static void post_fep_init(unsigned int crd)
 
        for (i = 0; i < bd->numports; i++, ch++, bc++)  { /* Begin for each port */
                unsigned long flags;
+               u16 tseg, rseg;
 
                ch->brdchan        = bc;
                ch->mailbox        = gd; 
@@ -1553,50 +1554,53 @@ static void post_fep_init(unsigned int crd)
                        shrinkmem = 0;
                }
 
+               tseg = readw(&bc->tseg);
+               rseg = readw(&bc->rseg);
+
                switch (bd->type) {
 
                        case PCIXEM:
                        case PCIXRJ:
                        case PCIXR:
                                /* Cover all the 2MEG cards */
-                               ch->txptr = memaddr + (((bc->tseg) << 4) & 0x1fffff);
-                               ch->rxptr = memaddr + (((bc->rseg) << 4) & 0x1fffff);
-                               ch->txwin = FEPWIN | ((bc->tseg) >> 11);
-                               ch->rxwin = FEPWIN | ((bc->rseg) >> 11);
+                               ch->txptr = memaddr + ((tseg << 4) & 0x1fffff);
+                               ch->rxptr = memaddr + ((rseg << 4) & 0x1fffff);
+                               ch->txwin = FEPWIN | (tseg >> 11);
+                               ch->rxwin = FEPWIN | (rseg >> 11);
                                break;
 
                        case PCXEM:
                        case EISAXEM:
                                /* Cover all the 32K windowed cards */
                                /* Mask equal to window size - 1 */
-                               ch->txptr = memaddr + (((bc->tseg) << 4) & 0x7fff);
-                               ch->rxptr = memaddr + (((bc->rseg) << 4) & 0x7fff);
-                               ch->txwin = FEPWIN | ((bc->tseg) >> 11);
-                               ch->rxwin = FEPWIN | ((bc->rseg) >> 11);
+                               ch->txptr = memaddr + ((tseg << 4) & 0x7fff);
+                               ch->rxptr = memaddr + ((rseg << 4) & 0x7fff);
+                               ch->txwin = FEPWIN | (tseg >> 11);
+                               ch->rxwin = FEPWIN | (rseg >> 11);
                                break;
 
                        case PCXEVE:
                        case PCXE:
-                               ch->txptr = memaddr + (((bc->tseg - bd->memory_seg) << 4) & 0x1fff);
-                               ch->txwin = FEPWIN | ((bc->tseg - bd->memory_seg) >> 9);
-                               ch->rxptr = memaddr + (((bc->rseg - bd->memory_seg) << 4) & 0x1fff);
-                               ch->rxwin = FEPWIN | ((bc->rseg - bd->memory_seg) >>9 );
+                               ch->txptr = memaddr + (((tseg - bd->memory_seg) << 4) & 0x1fff);
+                               ch->txwin = FEPWIN | ((tseg - bd->memory_seg) >> 9);
+                               ch->rxptr = memaddr + (((rseg - bd->memory_seg) << 4) & 0x1fff);
+                               ch->rxwin = FEPWIN | ((rseg - bd->memory_seg) >>9 );
                                break;
 
                        case PCXI:
                        case PC64XE:
-                               ch->txptr = memaddr + ((bc->tseg - bd->memory_seg) << 4);
-                               ch->rxptr = memaddr + ((bc->rseg - bd->memory_seg) << 4);
+                               ch->txptr = memaddr + ((tseg - bd->memory_seg) << 4);
+                               ch->rxptr = memaddr + ((rseg - bd->memory_seg) << 4);
                                ch->txwin = ch->rxwin = 0;
                                break;
 
                } /* End switch bd->type */
 
                ch->txbufhead = 0;
-               ch->txbufsize = bc->tmax + 1;
+               ch->txbufsize = readw(&bc->tmax) + 1;
        
                ch->rxbufhead = 0;
-               ch->rxbufsize = bc->rmax + 1;
+               ch->rxbufsize = readw(&bc->rmax) + 1;
        
                lowwater = ch->txbufsize >= 2000 ? 1024 : (ch->txbufsize / 2);
 
@@ -1718,11 +1722,11 @@ static void epcapoll(unsigned long ignored)
 static void doevent(int crd)
 { /* Begin doevent */
 
-       void *eventbuf;
+       void __iomem *eventbuf;
        struct channel *ch, *chan0;
        static struct tty_struct *tty;
        struct board_info *bd;
-       struct board_chan *bc;
+       struct board_chan __iomem *bc;
        unsigned int tail, head;
        int event, channel;
        int mstat, lstat;
@@ -1817,7 +1821,7 @@ static void doevent(int crd)
 static void fepcmd(struct channel *ch, int cmd, int word_or_byte,
                    int byte2, int ncmds, int bytecmd)
 { /* Begin fepcmd */
-       unchar *memaddr;
+       unchar __iomem *memaddr;
        unsigned int head, cmdTail, cmdStart, cmdMax;
        long count;
        int n;
@@ -2000,7 +2004,7 @@ static void epcaparam(struct tty_struct *tty, struct channel *ch)
 
        unsigned int cmdHead;
        struct termios *ts;
-       struct board_chan *bc;
+       struct board_chan __iomem *bc;
        unsigned mval, hflow, cflag, iflag;
 
        bc = ch->brdchan;
@@ -2010,7 +2014,7 @@ static void epcaparam(struct tty_struct *tty, struct channel *ch)
        ts = tty->termios;
        if ((ts->c_cflag & CBAUD) == 0)  { /* Begin CBAUD detected */
                cmdHead = readw(&bc->rin);
-               bc->rout = cmdHead;
+               writew(cmdHead, &bc->rout);
                cmdHead = readw(&bc->tin);
                /* Changing baud in mid-stream transmission can be wonderful */
                /* ---------------------------------------------------------------
@@ -2116,7 +2120,7 @@ static void receive_data(struct channel *ch)
        unchar *rptr;
        struct termios *ts = NULL;
        struct tty_struct *tty;
-       struct board_chan *bc;
+       struct board_chan __iomem *bc;
        int dataToRead, wrapgap, bytesAvailable;
        unsigned int tail, head;
        unsigned int wrapmask;
@@ -2154,7 +2158,7 @@ static void receive_data(struct channel *ch)
        --------------------------------------------------------------------- */
 
        if (!tty || !ts || !(ts->c_cflag & CREAD))  {
-               bc->rout = head;
+               writew(head, &bc->rout);
                return;
        }
 
@@ -2270,7 +2274,7 @@ static int info_ioctl(struct tty_struct *tty, struct file * file,
 static int pc_tiocmget(struct tty_struct *tty, struct file *file)
 {
        struct channel *ch = (struct channel *) tty->driver_data;
-       struct board_chan *bc;
+       struct board_chan __iomem *bc;
        unsigned int mstat, mflag = 0;
        unsigned long flags;
 
@@ -2351,7 +2355,7 @@ static int pc_ioctl(struct tty_struct *tty, struct file * file,
        unsigned long flags;
        unsigned int mflag, mstat;
        unsigned char startc, stopc;
-       struct board_chan *bc;
+       struct board_chan __iomem *bc;
        struct channel *ch = (struct channel *) tty->driver_data;
        void __user *argp = (void __user *)arg;
        
@@ -2633,7 +2637,7 @@ static void pc_start(struct tty_struct *tty)
                spin_lock_irqsave(&epca_lock, flags);
                /* Just in case output was resumed because of a change in Digi-flow */
                if (ch->statusflags & TXSTOPPED)  { /* Begin transmit resume requested */
-                       struct board_chan *bc;
+                       struct board_chan __iomem *bc;
                        globalwinon(ch);
                        bc = ch->brdchan;
                        if (ch->statusflags & LOWWAIT)
@@ -2727,7 +2731,7 @@ void digi_send_break(struct channel *ch, int msec)
 static void setup_empty_event(struct tty_struct *tty, struct channel *ch)
 { /* Begin setup_empty_event */
 
-       struct board_chan *bc = ch->brdchan;
+       struct board_chan __iomem *bc = ch->brdchan;
 
        globalwinon(ch);
        ch->statusflags |= EMPTYWAIT;

diff --git a/drivers/char/epca.h b/drivers/char/epca.h
index 20eeb5a..456d6c8 100644 (file)
--- a/drivers/char/epca.h
+++ b/drivers/char/epca.h
@@ -128,17 +128,17 @@ struct channel
        unsigned long  c_cflag;
        unsigned long  c_lflag;
        unsigned long  c_oflag;
-       unsigned char *txptr;
-       unsigned char *rxptr;
+       unsigned char __iomem *txptr;
+       unsigned char __iomem *rxptr;
        unsigned char *tmp_buf;
        struct board_info           *board;
-       struct board_chan           *brdchan;
+       struct board_chan           __iomem *brdchan;
        struct digi_struct          digiext;
        struct tty_struct           *tty;
        wait_queue_head_t           open_wait;
        wait_queue_head_t           close_wait;
        struct work_struct          tqueue;
-       struct global_data          *mailbox;
+       struct global_data          __iomem *mailbox;
 };
 
 struct board_info      
@@ -149,8 +149,8 @@ struct board_info
        unsigned short numports;
        unsigned long port;
        unsigned long membase;
-       unsigned char __iomem *re_map_port;
-       unsigned char *re_map_membase;
+       void __iomem *re_map_port;
+       void __iomem *re_map_membase;
        unsigned long  memory_seg;
        void ( * memwinon )     (struct board_info *, unsigned int) ;
        void ( * memwinoff )    (struct board_info *, unsigned int) ;