2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
16 * Copyright (C) 2006 infineon
17 * Copyright (C) 2007 John Crispin <blogic@openwrt.org>
21 // ### TO DO: general issues:
23 // - interrupt handling (direct/indirect)
24 // - pin/mux-handling (just overall concept due to project dependency)
25 // - multiple instances capability
26 // - slave functionality
28 #include <linux/module.h>
29 #include <linux/errno.h>
30 #include <linux/signal.h>
31 #include <linux/sched.h>
32 #include <linux/timer.h>
33 #include <linux/interrupt.h>
34 #include <linux/major.h>
35 #include <linux/string.h>
37 #include <linux/proc_fs.h>
38 #include <linux/fcntl.h>
39 #include <linux/ptrace.h>
41 #include <linux/ioport.h>
42 #include <linux/init.h>
43 #include <linux/delay.h>
44 #include <linux/spinlock.h>
45 #include <linux/slab.h>
47 #include <asm/system.h>
50 #include <asm/uaccess.h>
51 #include <asm/bitops.h>
53 #include <linux/types.h>
54 #include <linux/kernel.h>
55 #include <linux/version.h>
57 #include <asm/ifxmips/ifxmips.h>
58 #include <asm/ifxmips/ifxmips_irq.h>
59 #include <asm/ifxmips/ifx_ssc_defines.h>
60 #include <asm/ifxmips/ifx_ssc.h>
62 #ifdef SSC_FRAME_INT_ENABLE
63 #undef SSC_FRAME_INT_ENABLE
72 /* allow the user to set the major device number */
76 * This is the per-channel data structure containing pointers, flags
77 * and variables for the port. This driver supports a maximum of PORT_CNT.
78 * isp is allocated in ifx_ssc_init() based on the chip version.
80 static struct ifx_ssc_port *isp;
82 /* prototypes for fops */
83 static ssize_t ifx_ssc_read (struct file *, char *, size_t, loff_t *);
84 static ssize_t ifx_ssc_write (struct file *, const char *, size_t, loff_t *);
85 //static unsigned int ifx_ssc_poll(struct file *, struct poll_table_struct *);
86 int ifx_ssc_ioctl (struct inode *, struct file *, unsigned int,
88 int ifx_ssc_open (struct inode *, struct file *);
89 int ifx_ssc_close (struct inode *, struct file *);
91 /* other forward declarations */
92 static unsigned int ifx_ssc_get_kernel_clk (struct ifx_ssc_port *info);
93 static void tx_int (struct ifx_ssc_port *);
94 static int ifx_ssc1_read_proc (char *, char **, off_t, int, int *, void *);
96 extern unsigned int ifxmips_get_fpi_hz (void);
97 extern void mask_and_ack_ifxmips_irq (unsigned int irq_nr);
99 static struct file_operations ifx_ssc_fops = {
100 .owner = THIS_MODULE,
101 .read = ifx_ssc_read,
102 .write = ifx_ssc_write,
103 .ioctl = ifx_ssc_ioctl,
104 .open = ifx_ssc_open,
105 .release = ifx_ssc_close,
108 static inline unsigned int
109 ifx_ssc_get_kernel_clk (struct ifx_ssc_port *info)
113 rmc = (READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_CLC) & IFX_CLC_RUN_DIVIDER_MASK) >> IFX_CLC_RUN_DIVIDER_OFFSET;
116 printk ("ifx_ssc_get_kernel_clk rmc==0 \n");
119 return ifxmips_get_fpi_hz () / rmc;
123 #ifdef IFX_SSC_INT_USE_BH
125 * This routine is used by the interrupt handler to schedule
126 * processing in the software interrupt portion of the driver
127 * (also known as the "bottom half"). This can be called any
128 * number of times for any channel without harm.
131 ifx_ssc_sched_event (struct ifx_ssc_port *info, int event)
133 info->event |= 1 << event; /* remember what kind of event and who */
134 queue_task (&info->tqueue, &tq_cyclades); /* it belongs to */
135 mark_bh (CYCLADES_BH); /* then trigger event */
139 do_softint (void *private_)
141 struct ifx_ssc_port *info = (struct ifx_ssc_port *) private_;
143 if (test_and_clear_bit (Cy_EVENT_HANGUP, &info->event))
145 wake_up_interruptible (&info->open_wait);
146 info->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CALLOUT_ACTIVE);
149 if (test_and_clear_bit (Cy_EVENT_OPEN_WAKEUP, &info->event))
150 wake_up_interruptible (&info->open_wait);
152 if (test_and_clear_bit (Cy_EVENT_DELTA_WAKEUP, &info->event))
153 wake_up_interruptible (&info->delta_msr_wait);
155 if (test_and_clear_bit (Cy_EVENT_WRITE_WAKEUP, &info->event))
156 wake_up_interruptible (&tty->write_wait);
158 if (test_and_clear_bit (Cy_EVENT_SHUTDOWN_WAKEUP, &info->event))
159 wake_up_interruptible (&info->shutdown_wait);
166 rx_int (struct ifx_ssc_port *info)
168 int fifo_fill_lev, bytes_in_buf, i;
169 unsigned long tmp_val;
170 unsigned long *tmp_ptr;
171 unsigned int rx_valid_cnt;
172 /* number of words waiting in the RX FIFO */
173 fifo_fill_lev = (READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_FSTAT) & IFX_SSC_FSTAT_RECEIVED_WORDS_MASK) >> IFX_SSC_FSTAT_RECEIVED_WORDS_OFFSET;
174 // Note: There are always 32 bits in a fifo-entry except for the last
175 // word of a contigous transfer block and except for not in rx-only
176 // mode and CON.ENBV set. But for this case it should be a convention
177 // in software which helps:
178 // In tx or rx/tx mode all transfers from the buffer to the FIFO are
179 // 32-bit wide, except for the last three bytes, which could be a
180 // combination of 16- and 8-bit access.
181 // => The whole block is received as 32-bit words as a contigous stream,
182 // even if there was a gap in tx which has the fifo run out of data!
183 // Just the last fifo entry *may* be partially filled (0, 1, 2 or 3 bytes)!
185 /* free space in the RX buffer */
186 bytes_in_buf = info->rxbuf_end - info->rxbuf_ptr;
187 // transfer with 32 bits per entry
188 while ((bytes_in_buf >= 4) && (fifo_fill_lev > 0)) {
189 tmp_ptr = (unsigned long *) info->rxbuf_ptr;
190 *tmp_ptr = READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_RB);
191 info->rxbuf_ptr += 4;
192 info->stats.rxBytes += 4;
197 // now do the rest as mentioned in STATE.RXBV
198 while ((bytes_in_buf > 0) && (fifo_fill_lev > 0)) {
199 rx_valid_cnt = (READ_PERIPHERAL_REGISTER(info->mapbase + IFX_SSC_STATE) & IFX_SSC_STATE_RX_BYTE_VALID_MASK) >> IFX_SSC_STATE_RX_BYTE_VALID_OFFSET;
200 if (rx_valid_cnt == 0)
203 if (rx_valid_cnt > bytes_in_buf)
204 rx_valid_cnt = bytes_in_buf;
206 tmp_val = READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_RB);
208 for (i = 0; i < rx_valid_cnt; i++)
210 *info->rxbuf_ptr = (tmp_val >> (8 * (rx_valid_cnt - i - 1))) & 0xff;
214 info->stats.rxBytes += rx_valid_cnt;
217 // check if transfer is complete
218 if (info->rxbuf_ptr >= info->rxbuf_end)
220 disable_irq(info->rxirq);
221 wake_up_interruptible (&info->rwait);
222 } else if ((info->opts.modeRxTx == IFX_SSC_MODE_RX) && (READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_RXCNT) == 0))
224 if (info->rxbuf_end - info->rxbuf_ptr < IFX_SSC_RXREQ_BLOCK_SIZE)
225 WRITE_PERIPHERAL_REGISTER ((info->rxbuf_end - info->rxbuf_ptr) << IFX_SSC_RXREQ_RXCOUNT_OFFSET, info->mapbase + IFX_SSC_RXREQ);
227 WRITE_PERIPHERAL_REGISTER (IFX_SSC_RXREQ_BLOCK_SIZE << IFX_SSC_RXREQ_RXCOUNT_OFFSET, info->mapbase + IFX_SSC_RXREQ);
232 tx_int (struct ifx_ssc_port *info)
235 int fifo_space, fill, i;
236 fifo_space = ((READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_ID) & IFX_SSC_PERID_TXFS_MASK) >> IFX_SSC_PERID_TXFS_OFFSET)
237 - ((READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_FSTAT) & IFX_SSC_FSTAT_TRANSMIT_WORDS_MASK) >> IFX_SSC_FSTAT_TRANSMIT_WORDS_OFFSET);
242 fill = info->txbuf_end - info->txbuf_ptr;
244 if (fill > fifo_space * 4)
245 fill = fifo_space * 4;
247 for (i = 0; i < fill / 4; i++)
249 // at first 32 bit access
250 WRITE_PERIPHERAL_REGISTER (*(UINT32 *) info->txbuf_ptr, info->mapbase + IFX_SSC_TB);
251 info->txbuf_ptr += 4;
254 fifo_space -= fill / 4;
255 info->stats.txBytes += fill & ~0x3;
257 if ((fifo_space > 0) & (fill > 1))
259 // trailing 16 bit access
260 WRITE_PERIPHERAL_REGISTER_16 (*(UINT16 *) info->txbuf_ptr, info->mapbase + IFX_SSC_TB);
261 info->txbuf_ptr += 2;
262 info->stats.txBytes += 2;
267 if ((fifo_space > 0) & (fill > 0))
269 // trailing 8 bit access
270 WRITE_PERIPHERAL_REGISTER_8 (*(UINT8 *) info->txbuf_ptr, info->mapbase + IFX_SSC_TB);
272 info->stats.txBytes++;
275 // check if transmission complete
276 if (info->txbuf_ptr >= info->txbuf_end)
278 disable_irq(info->txirq);
286 ifx_ssc_rx_int (int irq, void *dev_id)
288 struct ifx_ssc_port *info = (struct ifx_ssc_port *) dev_id;
295 ifx_ssc_tx_int (int irq, void *dev_id)
297 struct ifx_ssc_port *info = (struct ifx_ssc_port *) dev_id;
304 ifx_ssc_err_int (int irq, void *dev_id)
306 struct ifx_ssc_port *info = (struct ifx_ssc_port *) dev_id;
308 unsigned int write_back = 0;
311 local_irq_save (flags);
312 state = READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_STATE);
314 if ((state & IFX_SSC_STATE_RX_UFL) != 0) {
315 info->stats.rxUnErr++;
316 write_back |= IFX_SSC_WHBSTATE_CLR_RX_UFL_ERROR;
319 if ((state & IFX_SSC_STATE_RX_OFL) != 0) {
320 info->stats.rxOvErr++;
321 write_back |= IFX_SSC_WHBSTATE_CLR_RX_OFL_ERROR;
324 if ((state & IFX_SSC_STATE_TX_OFL) != 0) {
325 info->stats.txOvErr++;
326 write_back |= IFX_SSC_WHBSTATE_CLR_TX_OFL_ERROR;
329 if ((state & IFX_SSC_STATE_TX_UFL) != 0) {
330 info->stats.txUnErr++;
331 write_back |= IFX_SSC_WHBSTATE_CLR_TX_UFL_ERROR;
334 if ((state & IFX_SSC_STATE_MODE_ERR) != 0) {
335 info->stats.modeErr++;
336 write_back |= IFX_SSC_WHBSTATE_CLR_MODE_ERROR;
340 WRITE_PERIPHERAL_REGISTER (write_back, info->mapbase + IFX_SSC_WHBSTATE);
342 local_irq_restore (flags);
348 ifx_ssc_abort (struct ifx_ssc_port *info)
353 local_irq_save (flags);
355 disable_irq(info->rxirq);
356 disable_irq(info->txirq);
357 disable_irq(info->errirq);
359 local_irq_restore (flags);
361 // disable SSC (also aborts a receive request!)
362 // ### TO DO: Perhaps it's better to abort after the receiption of a
363 // complete word. The disable cuts the transmission immediatly and
364 // releases the chip selects. This could result in unpredictable
365 // behavior of connected external devices!
366 enabled = (READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_STATE) & IFX_SSC_STATE_IS_ENABLED) != 0;
367 WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_CLR_ENABLE, info->mapbase + IFX_SSC_WHBSTATE);
370 WRITE_PERIPHERAL_REGISTER (IFX_SSC_XFCON_FIFO_FLUSH, info->mapbase + IFX_SSC_TXFCON);
371 WRITE_PERIPHERAL_REGISTER (IFX_SSC_XFCON_FIFO_FLUSH, info->mapbase + IFX_SSC_RXFCON);
374 if (info->txbuf != NULL)
380 // wakeup read process
381 if (info->rxbuf != NULL)
382 wake_up_interruptible (&info->rwait);
384 // clear pending int's
385 mask_and_ack_ifxmips_irq(info->rxirq);
386 mask_and_ack_ifxmips_irq(info->txirq);
387 mask_and_ack_ifxmips_irq(info->errirq);
390 WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_CLR_ALL_ERROR, info->mapbase + IFX_SSC_WHBSTATE);
393 WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_SET_ENABLE, info->mapbase + IFX_SSC_WHBSTATE);
398 * This routine is called whenever a port is opened. It enforces
399 * exclusive opening of a port and enables interrupts, etc.
402 ifx_ssc_open (struct inode *inode, struct file *filp)
404 struct ifx_ssc_port *info;
408 if ((inode == (struct inode *) 0) || (inode == (struct inode *) 1)) {
412 line = MINOR (filp->f_dentry->d_inode->i_rdev);
413 filp->f_op = &ifx_ssc_fops;
416 /* don't open more minor devices than we can support */
417 if (line < 0 || line >= PORT_CNT)
423 if (info->port_is_open != 0)
425 info->port_is_open++;
427 disable_irq(info->rxirq);
428 disable_irq(info->txirq);
429 disable_irq(info->errirq);
431 /* Flush and enable TX/RX FIFO */
432 WRITE_PERIPHERAL_REGISTER ((IFX_SSC_DEF_TXFIFO_FL << IFX_SSC_XFCON_ITL_OFFSET) | IFX_SSC_XFCON_FIFO_FLUSH | IFX_SSC_XFCON_FIFO_ENABLE, info->mapbase + IFX_SSC_TXFCON);
433 WRITE_PERIPHERAL_REGISTER ((IFX_SSC_DEF_RXFIFO_FL << IFX_SSC_XFCON_ITL_OFFSET) | IFX_SSC_XFCON_FIFO_FLUSH | IFX_SSC_XFCON_FIFO_ENABLE, info->mapbase + IFX_SSC_RXFCON);
435 /* logically flush the software FIFOs */
439 /* clear all error bits */
440 WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_CLR_ALL_ERROR, info->mapbase + IFX_SSC_WHBSTATE);
442 // clear pending interrupts
443 mask_and_ack_ifxmips_irq(info->rxirq);
444 mask_and_ack_ifxmips_irq(info->txirq);
445 mask_and_ack_ifxmips_irq(info->errirq);
447 WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_SET_ENABLE, info->mapbase + IFX_SSC_WHBSTATE);
451 EXPORT_SYMBOL(ifx_ssc_open);
454 ifx_ssc_close (struct inode *inode, struct file *filp)
456 struct ifx_ssc_port *info;
459 if ((inode == (struct inode *) 0) || (inode == (struct inode *) 1))
462 idx = MINOR (filp->f_dentry->d_inode->i_rdev);
464 if (idx < 0 || idx >= PORT_CNT)
471 WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_CLR_ENABLE, info->mapbase + IFX_SSC_WHBSTATE);
475 info->port_is_open--;
479 EXPORT_SYMBOL(ifx_ssc_close);
482 ifx_ssc_read_helper_poll (struct ifx_ssc_port *info, char *buf, size_t len, int from_kernel)
487 if (info->opts.modeRxTx == IFX_SSC_MODE_TX)
489 local_irq_save (flags);
490 info->rxbuf_ptr = info->rxbuf;
491 info->rxbuf_end = info->rxbuf + len;
492 local_irq_restore (flags);
493 /* Vinetic driver always works in IFX_SSC_MODE_RXTX */
494 /* TXRX in poll mode */
495 while (info->rxbuf_ptr < info->rxbuf_end)
497 if (info->txbuf_ptr < info->txbuf_end)
503 ret_val = info->rxbuf_ptr - info->rxbuf;
509 ifx_ssc_read_helper (struct ifx_ssc_port *info, char *buf, size_t len, int from_kernel)
513 DECLARE_WAITQUEUE (wait, current);
515 if (info->opts.modeRxTx == IFX_SSC_MODE_TX)
518 local_irq_save (flags);
519 info->rxbuf_ptr = info->rxbuf;
520 info->rxbuf_end = info->rxbuf + len;
522 if (info->opts.modeRxTx == IFX_SSC_MODE_RXTX)
524 if ((info->txbuf == NULL) || (info->txbuf != info->txbuf_ptr) || (info->txbuf_end != len + info->txbuf))
526 local_irq_restore (flags);
527 printk ("IFX SSC - %s: write must be called before calling " "read in combined RX/TX!\n", __func__);
531 local_irq_restore(flags);
534 if (info->txbuf_ptr < info->txbuf_end)
535 enable_irq(info->txirq);
537 enable_irq(info->rxirq);
539 local_irq_restore(flags);
540 if (READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_RXCNT) & IFX_SSC_RXCNT_TODO_MASK)
542 enable_irq(info->rxirq);
543 if (len < IFX_SSC_RXREQ_BLOCK_SIZE)
544 WRITE_PERIPHERAL_REGISTER (len << IFX_SSC_RXREQ_RXCOUNT_OFFSET, info->mapbase + IFX_SSC_RXREQ);
546 WRITE_PERIPHERAL_REGISTER (IFX_SSC_RXREQ_BLOCK_SIZE << IFX_SSC_RXREQ_RXCOUNT_OFFSET, info->mapbase + IFX_SSC_RXREQ);
549 __add_wait_queue (&info->rwait, &wait);
550 set_current_state (TASK_INTERRUPTIBLE);
553 local_irq_save (flags);
554 if (info->rxbuf_ptr >= info->rxbuf_end)
557 local_irq_restore (flags);
559 if (signal_pending (current))
561 ret_val = -ERESTARTSYS;
567 ret_val = info->rxbuf_ptr - info->rxbuf;
568 local_irq_restore (flags);
571 current->state = TASK_RUNNING;
572 __remove_wait_queue (&info->rwait, &wait);
578 ifx_ssc_write_helper (struct ifx_ssc_port *info, const char *buf,
579 size_t len, int from_kernel)
581 if (info->opts.modeRxTx == IFX_SSC_MODE_RX)
584 info->txbuf_ptr = info->txbuf;
585 info->txbuf_end = len + info->txbuf;
586 if (info->opts.modeRxTx == IFX_SSC_MODE_TX)
589 if (info->txbuf_ptr < info->txbuf_end)
591 enable_irq(info->txirq);
599 ifx_ssc_kread (int port, char *kbuf, size_t len)
601 struct ifx_ssc_port *info;
604 if (port < 0 || port >= PORT_CNT)
612 if (info->rxbuf != NULL)
614 printk ("SSC device busy\n");
619 if (info->rxbuf == NULL)
621 printk ("SSC device error\n");
625 ret_val = ifx_ssc_read_helper_poll (info, kbuf, len, 1);
628 disable_irq(info->rxirq);
632 EXPORT_SYMBOL(ifx_ssc_kread);
635 ifx_ssc_kwrite (int port, const char *kbuf, size_t len)
637 struct ifx_ssc_port *info;
640 if (port < 0 || port >= PORT_CNT)
648 // check if transmission in progress
649 if (info->txbuf != NULL)
652 info->txbuf = (char *) kbuf;
654 ret_val = ifx_ssc_write_helper (info, info->txbuf, len, 1);
661 EXPORT_SYMBOL(ifx_ssc_kwrite);
664 ifx_ssc_read (struct file *filp, char *ubuf, size_t len, loff_t * off)
668 struct ifx_ssc_port *info;
670 idx = MINOR (filp->f_dentry->d_inode->i_rdev);
673 if (info->rxbuf != NULL)
676 info->rxbuf = kmalloc (len + 3, GFP_KERNEL);
677 if (info->rxbuf == NULL)
680 ret_val = ifx_ssc_read_helper (info, info->rxbuf, len, 0);
681 if (copy_to_user ((void *) ubuf, info->rxbuf, ret_val) != 0)
684 disable_irq(info->rxirq);
693 ifx_ssc_write (struct file *filp, const char *ubuf, size_t len, loff_t * off)
696 struct ifx_ssc_port *info;
702 idx = MINOR (filp->f_dentry->d_inode->i_rdev);
705 if (info->txbuf != NULL)
708 info->txbuf = kmalloc (len + 3, GFP_KERNEL);
709 if (info->txbuf == NULL)
712 ret_val = copy_from_user (info->txbuf, ubuf, len);
714 ret_val = ifx_ssc_write_helper (info, info->txbuf, len, 0);
727 static struct ifx_ssc_frm_status *
728 ifx_ssc_frm_status_get (struct ifx_ssc_port *info)
732 tmp = READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_SFSTAT);
733 info->frm_status.DataBusy = (tmp & IFX_SSC_SFSTAT_IN_DATA) > 0;
734 info->frm_status.PauseBusy = (tmp & IFX_SSC_SFSTAT_IN_PAUSE) > 0;
735 info->frm_status.DataCount = (tmp & IFX_SSC_SFSTAT_DATA_COUNT_MASK) >> IFX_SSC_SFSTAT_DATA_COUNT_OFFSET;
736 info->frm_status.PauseCount = (tmp & IFX_SSC_SFSTAT_PAUSE_COUNT_MASK) >> IFX_SSC_SFSTAT_PAUSE_COUNT_OFFSET;
737 tmp = READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_SFCON);
738 info->frm_status.EnIntAfterData = (tmp & IFX_SSC_SFCON_FIR_ENABLE_BEFORE_PAUSE) > 0;
739 info->frm_status.EnIntAfterPause = (tmp & IFX_SSC_SFCON_FIR_ENABLE_AFTER_PAUSE) > 0;
741 return &info->frm_status;
745 static struct ifx_ssc_frm_opts *
746 ifx_ssc_frm_control_get (struct ifx_ssc_port *info)
750 tmp = READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_SFCON);
751 info->frm_opts.FrameEnable = (tmp & IFX_SSC_SFCON_SF_ENABLE) > 0;
752 info->frm_opts.DataLength = (tmp & IFX_SSC_SFCON_DATA_LENGTH_MASK) >> IFX_SSC_SFCON_DATA_LENGTH_OFFSET;
753 info->frm_opts.PauseLength = (tmp & IFX_SSC_SFCON_PAUSE_LENGTH_MASK) >> IFX_SSC_SFCON_PAUSE_LENGTH_OFFSET;
754 info->frm_opts.IdleData = (tmp & IFX_SSC_SFCON_PAUSE_DATA_MASK) >> IFX_SSC_SFCON_PAUSE_DATA_OFFSET;
755 info->frm_opts.IdleClock = (tmp & IFX_SSC_SFCON_PAUSE_CLOCK_MASK) >> IFX_SSC_SFCON_PAUSE_CLOCK_OFFSET;
756 info->frm_opts.StopAfterPause = (tmp & IFX_SSC_SFCON_STOP_AFTER_PAUSE) > 0;
758 return &info->frm_opts;
762 ifx_ssc_frm_control_set (struct ifx_ssc_port *info)
767 if ((info->frm_opts.DataLength > IFX_SSC_SFCON_DATA_LENGTH_MAX)
768 || (info->frm_opts.DataLength < 1)
769 || (info->frm_opts.PauseLength > IFX_SSC_SFCON_PAUSE_LENGTH_MAX)
770 || (info->frm_opts.PauseLength < 1)
771 || (info->frm_opts.IdleData & ~(IFX_SSC_SFCON_PAUSE_DATA_MASK >> IFX_SSC_SFCON_PAUSE_DATA_OFFSET))
772 || (info->frm_opts.IdleClock & ~(IFX_SSC_SFCON_PAUSE_CLOCK_MASK >> IFX_SSC_SFCON_PAUSE_CLOCK_OFFSET)))
775 // read interrupt bits (they're not changed here)
776 tmp = READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_SFCON) &
777 (IFX_SSC_SFCON_FIR_ENABLE_BEFORE_PAUSE | IFX_SSC_SFCON_FIR_ENABLE_AFTER_PAUSE);
779 // set all values with respect to it's bit position (for data and pause
781 tmp = (info->frm_opts.DataLength - 1) << IFX_SSC_SFCON_DATA_LENGTH_OFFSET;
782 tmp |= (info->frm_opts.PauseLength - 1) << IFX_SSC_SFCON_PAUSE_LENGTH_OFFSET;
783 tmp |= info->frm_opts.IdleData << IFX_SSC_SFCON_PAUSE_DATA_OFFSET;
784 tmp |= info->frm_opts.IdleClock << IFX_SSC_SFCON_PAUSE_CLOCK_OFFSET;
785 tmp |= info->frm_opts.FrameEnable * IFX_SSC_SFCON_SF_ENABLE;
786 tmp |= info->frm_opts.StopAfterPause * IFX_SSC_SFCON_STOP_AFTER_PAUSE;
788 WRITE_PERIPHERAL_REGISTER(tmp, info->mapbase + IFX_SSC_SFCON);
794 ifx_ssc_rxtx_mode_set (struct ifx_ssc_port *info, unsigned int val)
798 if (!(info) || (val & ~(IFX_SSC_MODE_MASK)))
801 if ((READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_STATE) & IFX_SSC_STATE_BUSY)
802 || (READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_RXCNT) & IFX_SSC_RXCNT_TODO_MASK))
805 tmp = (READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_CON) & ~(IFX_SSC_CON_RX_OFF | IFX_SSC_CON_TX_OFF)) | (val);
806 WRITE_PERIPHERAL_REGISTER (tmp, info->mapbase + IFX_SSC_CON);
807 info->opts.modeRxTx = val;
813 ifx_ssc_sethwopts (struct ifx_ssc_port *info)
815 unsigned long flags, bits;
816 struct ifx_ssc_hwopts *opts = &info->opts;
818 if ((opts->dataWidth < IFX_SSC_MIN_DATA_WIDTH)
819 || (opts->dataWidth > IFX_SSC_MAX_DATA_WIDTH))
822 bits = (opts->dataWidth - 1) << IFX_SSC_CON_DATA_WIDTH_OFFSET;
823 bits |= IFX_SSC_CON_ENABLE_BYTE_VALID;
825 if (opts->rxOvErrDetect)
826 bits |= IFX_SSC_CON_RX_OFL_CHECK;
827 if (opts->rxUndErrDetect)
828 bits |= IFX_SSC_CON_RX_UFL_CHECK;
829 if (opts->txOvErrDetect)
830 bits |= IFX_SSC_CON_TX_OFL_CHECK;
831 if (opts->txUndErrDetect)
832 bits |= IFX_SSC_CON_TX_UFL_CHECK;
834 bits |= IFX_SSC_CON_LOOPBACK_MODE;
836 bits |= IFX_SSC_CON_ECHO_MODE_ON;
837 if (opts->headingControl)
838 bits |= IFX_SSC_CON_MSB_FIRST;
839 if (opts->clockPhase)
840 bits |= IFX_SSC_CON_LATCH_THEN_SHIFT;
841 if (opts->clockPolarity)
842 bits |= IFX_SSC_CON_CLOCK_FALL;
844 switch (opts->modeRxTx)
846 case IFX_SSC_MODE_TX:
847 bits |= IFX_SSC_CON_RX_OFF;
849 case IFX_SSC_MODE_RX:
850 bits |= IFX_SSC_CON_TX_OFF;
854 local_irq_save (flags);
856 WRITE_PERIPHERAL_REGISTER (bits, info->mapbase + IFX_SSC_CON);
857 WRITE_PERIPHERAL_REGISTER ((info->opts.gpoCs << IFX_SSC_GPOCON_ISCSB0_POS) |
858 (info->opts.gpoInv << IFX_SSC_GPOCON_INVOUT0_POS), info->mapbase + IFX_SSC_GPOCON);
860 WRITE_PERIPHERAL_REGISTER (info->opts.gpoCs << IFX_SSC_WHBGPOSTAT_SETOUT0_POS, info->mapbase + IFX_SSC_WHBGPOSTAT);
863 if (opts->masterSelect)
864 WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_SET_MASTER_SELECT, info->mapbase + IFX_SSC_WHBSTATE);
866 WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_CLR_MASTER_SELECT, info->mapbase + IFX_SSC_WHBSTATE);
868 // init serial framing
869 WRITE_PERIPHERAL_REGISTER (0, info->mapbase + IFX_SSC_SFCON);
870 /* set up the port pins */
871 //check for general requirements to switch (external) pad/pin characteristics
872 /* TODO: P0.9 SPI_CS4, P0.10 SPI_CS5, P 0.11 SPI_CS6, because of ASC0 */
873 /* p0.15 SPI_CS1(EEPROM), P0.13 SPI_CS3, */
874 /* Set p0.15 to alternative 01, others to 00 (In/OUT) */
875 *(IFXMIPS_GPIO_P0_DIR) = (*IFXMIPS_GPIO_P0_DIR) | (0xA000);
876 *(IFXMIPS_GPIO_P0_ALTSEL0) = (((*IFXMIPS_GPIO_P0_ALTSEL0) | (0x8000)) & (~(0x2000)));
877 *(IFXMIPS_GPIO_P0_ALTSEL1) = (((*IFXMIPS_GPIO_P0_ALTSEL1) & (~0x8000)) & (~(0x2000)));
878 *(IFXMIPS_GPIO_P0_OD) = (*IFXMIPS_GPIO_P0_OD) | 0xA000;
880 /* p1.6 SPI_CS2(SFLASH), p1.0 SPI_DIN, p1.1 SPI_DOUT, p1.2 SPI_CLK */
881 *(IFXMIPS_GPIO_P1_DIR) = ((*IFXMIPS_GPIO_P1_DIR) | (0x46)) & (~1);
882 *(IFXMIPS_GPIO_P1_ALTSEL0) = ((*IFXMIPS_GPIO_P1_ALTSEL0) | (0x47));
883 *(IFXMIPS_GPIO_P1_ALTSEL1) = (*IFXMIPS_GPIO_P1_ALTSEL1) & (~0x47);
884 *(IFXMIPS_GPIO_P1_OD) = (*IFXMIPS_GPIO_P1_OD) | 0x0046;
887 /*TODO: CS4 CS5 CS6 */
888 *IFXMIPS_GPIO_P0_OUT = ((*IFXMIPS_GPIO_P0_OUT) | 0x2000);
890 local_irq_restore (flags);
896 ifx_ssc_set_baud (struct ifx_ssc_port *info, unsigned int baud)
898 unsigned int ifx_ssc_clock;
904 ifx_ssc_clock = ifx_ssc_get_kernel_clk(info);
905 if (ifx_ssc_clock == 0)
911 local_irq_save (flags);
913 enabled = (READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_STATE) & IFX_SSC_STATE_IS_ENABLED);
914 WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_CLR_ENABLE, info->mapbase + IFX_SSC_WHBSTATE);
916 br = (((ifx_ssc_clock >> 1) + baud / 2) / baud) - 1;
919 if (br > 0xffff || ((br == 0) &&
920 ((READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_STATE) & IFX_SSC_STATE_IS_MASTER) == 0))) {
921 local_irq_restore (flags);
922 printk ("%s: invalid baudrate %u\n", __func__, baud);
926 WRITE_PERIPHERAL_REGISTER (br, info->mapbase + IFX_SSC_BR);
929 WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_SET_ENABLE, info->mapbase + IFX_SSC_WHBSTATE);
931 local_irq_restore(flags);
938 ifx_ssc_hwinit (struct ifx_ssc_port *info)
943 enabled = (READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_STATE) & IFX_SSC_STATE_IS_ENABLED);
944 WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_CLR_ENABLE, info->mapbase + IFX_SSC_WHBSTATE);
946 if (ifx_ssc_sethwopts (info) < 0)
948 printk ("%s: setting the hardware options failed\n", __func__);
952 if (ifx_ssc_set_baud (info, info->baud) < 0)
954 printk ("%s: setting the baud rate failed\n", __func__);
958 local_irq_save (flags);
961 WRITE_PERIPHERAL_REGISTER ((IFX_SSC_DEF_TXFIFO_FL << IFX_SSC_XFCON_ITL_OFFSET) | IFX_SSC_XFCON_FIFO_ENABLE,
962 info->mapbase + IFX_SSC_TXFCON);
964 WRITE_PERIPHERAL_REGISTER ((IFX_SSC_DEF_RXFIFO_FL << IFX_SSC_XFCON_ITL_OFFSET) | IFX_SSC_XFCON_FIFO_ENABLE,
965 info->mapbase + IFX_SSC_RXFCON);
967 local_irq_restore (flags);
970 WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_SET_ENABLE, info->mapbase + IFX_SSC_WHBSTATE);
976 ifx_ssc_ioctl (struct inode *inode, struct file *filp, unsigned int cmd, unsigned long data)
978 struct ifx_ssc_port *info;
979 int line, ret_val = 0;
984 if ((inode == (struct inode *) 0) || (inode == (struct inode *) 1))
989 line = MINOR (filp->f_dentry->d_inode->i_rdev);
992 if (line < 0 || line >= PORT_CNT)
999 case IFX_SSC_STATS_READ:
1000 /* data must be a pointer to a struct ifx_ssc_statistics */
1002 memcpy ((void *) data, (void *) &info->stats,
1003 sizeof (struct ifx_ssc_statistics));
1004 else if (copy_to_user ((void *) data,
1005 (void *) &info->stats,
1006 sizeof (struct ifx_ssc_statistics)))
1009 case IFX_SSC_STATS_RESET:
1010 /* just resets the statistics counters */
1011 memset ((void *) &info->stats, 0,
1012 sizeof (struct ifx_ssc_statistics));
1014 case IFX_SSC_BAUD_SET:
1015 /* if the buffers are not empty then the port is */
1016 /* busy and we shouldn't change things on-the-fly! */
1017 if (!info->txbuf || !info->rxbuf ||
1018 (READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_STATE)
1019 & IFX_SSC_STATE_BUSY)) {
1025 flags = *((unsigned long *) data);
1026 else if (copy_from_user ((void *) &flags,
1027 (void *) data, sizeof (flags))) {
1035 if (ifx_ssc_set_baud (info, flags) < 0) {
1041 case IFX_SSC_BAUD_GET:
1043 *((unsigned int *) data) = info->baud;
1044 else if (copy_to_user ((void *) data,
1045 (void *) &info->baud,
1046 sizeof (unsigned long)))
1049 case IFX_SSC_RXTX_MODE_SET:
1051 tmp = *((unsigned long *) data);
1052 else if (copy_from_user ((void *) &tmp,
1053 (void *) data, sizeof (tmp))) {
1057 ret_val = ifx_ssc_rxtx_mode_set (info, tmp);
1059 case IFX_SSC_RXTX_MODE_GET:
1060 tmp = READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_CON) &
1061 (~(IFX_SSC_CON_RX_OFF | IFX_SSC_CON_TX_OFF));
1063 *((unsigned int *) data) = tmp;
1064 else if (copy_to_user ((void *) data,
1065 (void *) &tmp, sizeof (tmp)))
1070 ifx_ssc_abort (info);
1073 case IFX_SSC_GPO_OUT_SET:
1075 tmp = *((unsigned long *) data);
1076 else if (copy_from_user ((void *) &tmp,
1077 (void *) data, sizeof (tmp))) {
1081 if (tmp > IFX_SSC_MAX_GPO_OUT)
1084 WRITE_PERIPHERAL_REGISTER
1085 (1 << (tmp + IFX_SSC_WHBGPOSTAT_SETOUT0_POS),
1086 info->mapbase + IFX_SSC_WHBGPOSTAT);
1088 case IFX_SSC_GPO_OUT_CLR:
1090 tmp = *((unsigned long *) data);
1091 else if (copy_from_user ((void *) &tmp,
1092 (void *) data, sizeof (tmp))) {
1096 if (tmp > IFX_SSC_MAX_GPO_OUT)
1099 WRITE_PERIPHERAL_REGISTER
1100 (1 << (tmp + IFX_SSC_WHBGPOSTAT_CLROUT0_POS),
1101 info->mapbase + IFX_SSC_WHBGPOSTAT);
1104 case IFX_SSC_GPO_OUT_GET:
1105 tmp = READ_PERIPHERAL_REGISTER
1106 (info->mapbase + IFX_SSC_GPOSTAT);
1108 *((unsigned int *) data) = tmp;
1109 else if (copy_to_user ((void *) data,
1110 (void *) &tmp, sizeof (tmp)))
1113 case IFX_SSC_FRM_STATUS_GET:
1114 ifx_ssc_frm_status_get (info);
1116 memcpy ((void *) data, (void *) &info->frm_status,
1117 sizeof (struct ifx_ssc_frm_status));
1118 else if (copy_to_user ((void *) data,
1119 (void *) &info->frm_status,
1120 sizeof (struct ifx_ssc_frm_status)))
1123 case IFX_SSC_FRM_CONTROL_GET:
1124 ifx_ssc_frm_control_get (info);
1126 memcpy ((void *) data, (void *) &info->frm_opts,
1127 sizeof (struct ifx_ssc_frm_opts));
1128 else if (copy_to_user ((void *) data,
1129 (void *) &info->frm_opts,
1130 sizeof (struct ifx_ssc_frm_opts)))
1133 case IFX_SSC_FRM_CONTROL_SET:
1135 memcpy ((void *) &info->frm_opts, (void *) data,
1136 sizeof (struct ifx_ssc_frm_opts));
1137 else if (copy_to_user ((void *) &info->frm_opts,
1139 sizeof (struct ifx_ssc_frm_opts))) {
1143 ret_val = ifx_ssc_frm_control_set (info);
1145 case IFX_SSC_HWOPTS_SET:
1146 /* data must be a pointer to a struct ifx_ssc_hwopts */
1147 /* if the buffers are not empty then the port is */
1148 /* busy and we shouldn't change things on-the-fly! */
1149 if (!info->txbuf || !info->rxbuf ||
1150 (READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_STATE)
1151 & IFX_SSC_STATE_BUSY)) {
1156 memcpy ((void *) &info->opts, (void *) data,
1157 sizeof (struct ifx_ssc_hwopts));
1158 else if (copy_from_user ((void *) &info->opts,
1160 sizeof (struct ifx_ssc_hwopts))) {
1164 if (ifx_ssc_hwinit (info) < 0) {
1168 case IFX_SSC_HWOPTS_GET:
1169 /* data must be a pointer to a struct ifx_ssc_hwopts */
1171 memcpy ((void *) data, (void *) &info->opts,
1172 sizeof (struct ifx_ssc_hwopts));
1173 else if (copy_to_user ((void *) data,
1174 (void *) &info->opts,
1175 sizeof (struct ifx_ssc_hwopts)))
1179 ret_val = -ENOIOCTLCMD;
1184 EXPORT_SYMBOL(ifx_ssc_ioctl);
1187 ifx_ssc1_read_proc (char *page, char **start, off_t offset, int count, int *eof, void *data)
1190 unsigned long flags;
1192 local_save_flags(flags);
1193 local_irq_disable();
1195 off += sprintf (page + off, "Statistics for Infineon Synchronous Serial Controller SSC1\n");
1196 off += sprintf (page + off, "RX overflow errors %d\n", isp[0].stats.rxOvErr);
1197 off += sprintf (page + off, "RX underflow errors %d\n", isp[0].stats.rxUnErr);
1198 off += sprintf (page + off, "TX overflow errors %d\n", isp[0].stats.txOvErr);
1199 off += sprintf (page + off, "TX underflow errors %d\n", isp[0].stats.txUnErr);
1200 off += sprintf (page + off, "Abort errors %d\n", isp[0].stats.abortErr);
1201 off += sprintf (page + off, "Mode errors %d\n", isp[0].stats.modeErr);
1202 off += sprintf (page + off, "RX Bytes %d\n", isp[0].stats.rxBytes);
1203 off += sprintf (page + off, "TX Bytes %d\n", isp[0].stats.txBytes);
1205 local_irq_restore(flags);
1214 struct ifx_ssc_port *info;
1216 unsigned long flags;
1220 nbytes = PORT_CNT * sizeof(struct ifx_ssc_port);
1221 isp = (struct ifx_ssc_port*)kmalloc(nbytes, GFP_KERNEL);
1225 printk("%s: no memory for isp\n", __func__);
1228 memset(isp, 0, nbytes);
1231 if ((i = register_chrdev (maj, "ssc", &ifx_ssc_fops)) < 0)
1233 printk ("Unable to register major %d for the Infineon SSC\n", maj);
1239 if ((i = register_chrdev (maj, "ssc", &ifx_ssc_fops)) < 0)
1241 printk ("Unable to register major %d for the Infineon SSC\n", maj);
1250 /* set default values in ifx_ssc_port */
1251 for (i = 0; i < PORT_CNT; i++) {
1254 /* default values for the HwOpts */
1255 info->opts.AbortErrDetect = IFX_SSC_DEF_ABRT_ERR_DETECT;
1256 info->opts.rxOvErrDetect = IFX_SSC_DEF_RO_ERR_DETECT;
1257 info->opts.rxUndErrDetect = IFX_SSC_DEF_RU_ERR_DETECT;
1258 info->opts.txOvErrDetect = IFX_SSC_DEF_TO_ERR_DETECT;
1259 info->opts.txUndErrDetect = IFX_SSC_DEF_TU_ERR_DETECT;
1260 info->opts.loopBack = IFX_SSC_DEF_LOOP_BACK;
1261 info->opts.echoMode = IFX_SSC_DEF_ECHO_MODE;
1262 info->opts.idleValue = IFX_SSC_DEF_IDLE_DATA;
1263 info->opts.clockPolarity = IFX_SSC_DEF_CLOCK_POLARITY;
1264 info->opts.clockPhase = IFX_SSC_DEF_CLOCK_PHASE;
1265 info->opts.headingControl = IFX_SSC_DEF_HEADING_CONTROL;
1266 info->opts.dataWidth = IFX_SSC_DEF_DATA_WIDTH;
1267 info->opts.modeRxTx = IFX_SSC_DEF_MODE_RXTX;
1268 info->opts.gpoCs = IFX_SSC_DEF_GPO_CS;
1269 info->opts.gpoInv = IFX_SSC_DEF_GPO_INV;
1270 info->opts.masterSelect = IFX_SSC_DEF_MASTERSLAVE;
1271 info->baud = IFX_SSC_DEF_BAUDRATE;
1274 /* values specific to SSC1 */
1276 info->mapbase = IFXMIPS_SSC1_BASE_ADDR;
1277 info->txirq = IFXMIPS_SSC_TIR;
1278 info->rxirq = IFXMIPS_SSC_RIR;
1279 info->errirq = IFXMIPS_SSC_EIR;
1282 WRITE_PERIPHERAL_REGISTER (IFX_SSC_DEF_RMC << IFX_CLC_RUN_DIVIDER_OFFSET, info->mapbase + IFX_SSC_CLC);
1284 init_waitqueue_head (&info->rwait);
1286 local_irq_save (flags);
1288 // init serial framing register
1289 WRITE_PERIPHERAL_REGISTER (IFX_SSC_DEF_SFCON, info->mapbase + IFX_SSC_SFCON);
1291 ret_val = request_irq(info->txirq, ifx_ssc_tx_int, SA_INTERRUPT, "ifx_ssc_tx", info);
1294 printk("%s: unable to get irq %d\n", __func__, info->txirq);
1295 local_irq_restore(flags);
1299 ret_val = request_irq(info->rxirq, ifx_ssc_rx_int, SA_INTERRUPT, "ifx_ssc_rx", info);
1302 printk ("%s: unable to get irq %d\n", __func__, info->rxirq);
1303 local_irq_restore (flags);
1307 ret_val = request_irq(info->errirq, ifx_ssc_err_int, SA_INTERRUPT,"ifx_ssc_err", info);
1310 printk ("%s: unable to get irq %d\n", __func__, info->errirq);
1311 local_irq_restore (flags);
1314 WRITE_PERIPHERAL_REGISTER (IFX_SSC_DEF_IRNEN, info->mapbase + IFX_SSC_IRN_EN);
1316 enable_irq(info->txirq);
1317 enable_irq(info->rxirq);
1318 enable_irq(info->errirq);
1320 local_irq_restore (flags);
1323 for (i = 0; i < PORT_CNT; i++) {
1325 if (ifx_ssc_hwinit (info) < 0)
1327 printk ("%s: hardware init failed for port %d\n", __func__, i);
1332 create_proc_read_entry ("driver/ssc1", 0, NULL, ifx_ssc1_read_proc, NULL);
1337 free_irq(isp[0].txirq, &isp[0]);
1338 free_irq(isp[0].rxirq, &isp[0]);
1339 free_irq(isp[0].errirq, &isp[0]);
1346 ifx_ssc_cleanup_module (void)
1350 for (i = 0; i < PORT_CNT; i++) {
1351 WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_CLR_ENABLE, isp[i].mapbase + IFX_SSC_WHBSTATE);
1352 free_irq(isp[i].txirq, &isp[i]);
1353 free_irq(isp[i].rxirq, &isp[i]);
1354 free_irq(isp[i].errirq, &isp[i]);
1357 remove_proc_entry ("driver/ssc1", NULL);
1360 module_init(ifx_ssc_init);
1361 module_exit(ifx_ssc_cleanup_module);
1365 ifx_ssc_cs_low (u32 pin)
1368 if ((ret = ifx_ssc_ioctl ((struct inode *) 0, NULL, IFX_SSC_GPO_OUT_CLR, (unsigned long) &pin)))
1369 printk ("clear CS %d fails\n", pin);
1374 EXPORT_SYMBOL(ifx_ssc_cs_low);
1377 ifx_ssc_cs_high (u32 pin)
1380 if ((ret = ifx_ssc_ioctl((struct inode *) 0, NULL, IFX_SSC_GPO_OUT_SET, (unsigned long) &pin)))
1381 printk ("set CS %d fails\n", pin);
1386 EXPORT_SYMBOL(ifx_ssc_cs_high);
1389 ssc_session (char *tx_buf, u32 tx_len, char *rx_buf, u32 rx_len)
1393 char *ssc_tx_buf = NULL;
1394 char *ssc_rx_buf = NULL;
1398 if (tx_buf == NULL && tx_len == 0 && rx_buf == NULL && rx_len == 0) {
1399 printk ("invalid parameters\n");
1401 goto ssc_session_exit;
1403 else if (tx_buf == NULL || tx_len == 0) {
1404 if (rx_buf != NULL && rx_len != 0) {
1405 mode = IFX_SSC_MODE_RX;
1408 printk ("invalid parameters\n");
1410 goto ssc_session_exit;
1413 else if (rx_buf == NULL || rx_len == 0) {
1414 if (tx_buf != NULL && tx_len != 0) {
1415 mode = IFX_SSC_MODE_TX;
1418 printk ("invalid parameters\n");
1420 goto ssc_session_exit;
1424 mode = IFX_SSC_MODE_RXTX;
1427 if (mode == IFX_SSC_MODE_RXTX) {
1428 eff_size = tx_len + rx_len;
1430 else if (mode == IFX_SSC_MODE_RX) {
1437 //4 bytes alignment, required by driver
1438 /* change by TaiCheng */
1442 (char *) kmalloc (sizeof (char) *
1443 ((eff_size + 3) & (~3)),
1446 (char *) kmalloc (sizeof (char) *
1447 ((eff_size + 3) & (~3)),
1452 (char *) kmalloc (sizeof (char) *
1453 ((eff_size + 3) & (~3)),
1456 (char *) kmalloc (sizeof (char) *
1457 ((eff_size + 3) & (~3)),
1460 if (ssc_tx_buf == NULL || ssc_rx_buf == NULL) {
1461 printk ("no memory for size of %d\n", eff_size);
1463 goto ssc_session_exit;
1465 memset ((void *) ssc_tx_buf, 0, eff_size);
1466 memset ((void *) ssc_rx_buf, 0, eff_size);
1469 memcpy (ssc_tx_buf, tx_buf, tx_len);
1472 ret = ifx_ssc_kwrite (0, ssc_tx_buf, eff_size);
1475 ssc_tx_buf = NULL; //should be freed by ifx_ssc_kwrite
1478 if (ret != eff_size) {
1479 printk ("ifx_ssc_write return %d\n", ret);
1480 goto ssc_session_exit;
1482 ret = ifx_ssc_kread (0, ssc_rx_buf, eff_size);
1483 if (ret != eff_size) {
1484 printk ("ifx_ssc_read return %d\n", ret);
1485 goto ssc_session_exit;
1488 memcpy (rx_buf, ssc_rx_buf + tx_len, rx_len);
1490 if (mode == IFX_SSC_MODE_TX) {
1498 if (ssc_tx_buf != NULL)
1500 if (ssc_rx_buf != NULL)
1504 printk ("ssc session fails\n");
1510 ifx_ssc_txrx (char *tx_buf, u32 tx_len, char *rx_buf, u32 rx_len)
1512 return ssc_session(tx_buf, tx_len, rx_buf, rx_len);
1514 EXPORT_SYMBOL(ifx_ssc_txrx);
1517 ifx_ssc_tx (char *tx_buf, u32 tx_len)
1519 return ssc_session(tx_buf, tx_len, NULL, 0);
1521 EXPORT_SYMBOL(ifx_ssc_tx);
1524 ifx_ssc_rx (char *rx_buf, u32 rx_len)
1526 return ssc_session(NULL, 0, rx_buf, rx_len);
1528 EXPORT_SYMBOL(ifx_ssc_rx);
1530 MODULE_LICENSE("GPL");
1531 MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
1532 MODULE_DESCRIPTION("ifxmips ssc driver");