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1534 lines
40 KiB
C
1534 lines
40 KiB
C
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
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*
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* Copyright (C) 2006 infineon
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* Copyright (C) 2007 John Crispin <blogic@openwrt.org>
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*
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*/
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// ### TO DO: general issues:
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// - power management
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// - interrupt handling (direct/indirect)
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// - pin/mux-handling (just overall concept due to project dependency)
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// - multiple instances capability
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// - slave functionality
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/timer.h>
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#include <linux/interrupt.h>
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#include <linux/major.h>
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#include <linux/string.h>
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#include <linux/fs.h>
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#include <linux/proc_fs.h>
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#include <linux/fcntl.h>
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#include <linux/ptrace.h>
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#include <linux/mm.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/uaccess.h>
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#include <asm/bitops.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/version.h>
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#include <asm/danube/danube.h>
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#include <asm/danube/danube_irq.h>
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#include <asm/danube/ifx_ssc_defines.h>
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#include <asm/danube/ifx_ssc.h>
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#ifdef SSC_FRAME_INT_ENABLE
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#undef SSC_FRAME_INT_ENABLE
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#endif
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#define not_yet
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#define SPI_VINETIC
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/* allow the user to set the major device number */
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static int maj = 0;
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/*
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* This is the per-channel data structure containing pointers, flags
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* and variables for the port. This driver supports a maximum of PORT_CNT.
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* isp is allocated in ifx_ssc_init() based on the chip version.
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*/
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static struct ifx_ssc_port *isp;
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/* prototypes for fops */
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static ssize_t ifx_ssc_read (struct file *, char *, size_t, loff_t *);
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static ssize_t ifx_ssc_write (struct file *, const char *, size_t, loff_t *);
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//static unsigned int ifx_ssc_poll(struct file *, struct poll_table_struct *);
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int ifx_ssc_ioctl (struct inode *, struct file *, unsigned int,
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unsigned long);
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int ifx_ssc_open (struct inode *, struct file *);
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int ifx_ssc_close (struct inode *, struct file *);
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/* other forward declarations */
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static unsigned int ifx_ssc_get_kernel_clk (struct ifx_ssc_port *info);
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static void tx_int (struct ifx_ssc_port *);
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static int ifx_ssc1_read_proc (char *, char **, off_t, int, int *, void *);
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extern unsigned int danube_get_fpi_hz (void);
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extern void mask_and_ack_danube_irq (unsigned int irq_nr);
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static struct file_operations ifx_ssc_fops = {
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.owner = THIS_MODULE,
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.read = ifx_ssc_read,
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.write = ifx_ssc_write,
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.ioctl = ifx_ssc_ioctl,
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.open = ifx_ssc_open,
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.release = ifx_ssc_close,
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};
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static inline unsigned int
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ifx_ssc_get_kernel_clk (struct ifx_ssc_port *info)
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{
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unsigned int rmc;
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rmc = (READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_CLC) & IFX_CLC_RUN_DIVIDER_MASK) >> IFX_CLC_RUN_DIVIDER_OFFSET;
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if (rmc == 0)
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{
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printk ("ifx_ssc_get_kernel_clk rmc==0 \n");
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return 0;
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}
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return danube_get_fpi_hz () / rmc;
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}
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#ifndef not_yet
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#ifdef IFX_SSC_INT_USE_BH
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/*
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* This routine is used by the interrupt handler to schedule
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* processing in the software interrupt portion of the driver
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* (also known as the "bottom half"). This can be called any
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* number of times for any channel without harm.
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*/
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static inline void
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ifx_ssc_sched_event (struct ifx_ssc_port *info, int event)
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{
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info->event |= 1 << event; /* remember what kind of event and who */
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queue_task (&info->tqueue, &tq_cyclades); /* it belongs to */
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mark_bh (CYCLADES_BH); /* then trigger event */
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}
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static void
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do_softint (void *private_)
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{
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struct ifx_ssc_port *info = (struct ifx_ssc_port *) private_;
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if (test_and_clear_bit (Cy_EVENT_HANGUP, &info->event))
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{
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wake_up_interruptible (&info->open_wait);
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info->flags &= ~(ASYNC_NORMAL_ACTIVE | ASYNC_CALLOUT_ACTIVE);
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}
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if (test_and_clear_bit (Cy_EVENT_OPEN_WAKEUP, &info->event))
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wake_up_interruptible (&info->open_wait);
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if (test_and_clear_bit (Cy_EVENT_DELTA_WAKEUP, &info->event))
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wake_up_interruptible (&info->delta_msr_wait);
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if (test_and_clear_bit (Cy_EVENT_WRITE_WAKEUP, &info->event))
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wake_up_interruptible (&tty->write_wait);
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#ifdef Z_WAKE
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if (test_and_clear_bit (Cy_EVENT_SHUTDOWN_WAKEUP, &info->event))
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wake_up_interruptible (&info->shutdown_wait);
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#endif
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}
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#endif
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#endif
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inline static void
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rx_int (struct ifx_ssc_port *info)
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{
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int fifo_fill_lev, bytes_in_buf, i;
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unsigned long tmp_val;
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unsigned long *tmp_ptr;
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unsigned int rx_valid_cnt;
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/* number of words waiting in the RX FIFO */
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fifo_fill_lev = (READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_FSTAT) & IFX_SSC_FSTAT_RECEIVED_WORDS_MASK) >> IFX_SSC_FSTAT_RECEIVED_WORDS_OFFSET;
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// Note: There are always 32 bits in a fifo-entry except for the last
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// word of a contigous transfer block and except for not in rx-only
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// mode and CON.ENBV set. But for this case it should be a convention
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// in software which helps:
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// In tx or rx/tx mode all transfers from the buffer to the FIFO are
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// 32-bit wide, except for the last three bytes, which could be a
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// combination of 16- and 8-bit access.
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// => The whole block is received as 32-bit words as a contigous stream,
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// even if there was a gap in tx which has the fifo run out of data!
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// Just the last fifo entry *may* be partially filled (0, 1, 2 or 3 bytes)!
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/* free space in the RX buffer */
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bytes_in_buf = info->rxbuf_end - info->rxbuf_ptr;
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// transfer with 32 bits per entry
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while ((bytes_in_buf >= 4) && (fifo_fill_lev > 0)) {
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tmp_ptr = (unsigned long *) info->rxbuf_ptr;
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*tmp_ptr = READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_RB);
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info->rxbuf_ptr += 4;
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info->stats.rxBytes += 4;
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fifo_fill_lev--;
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bytes_in_buf -= 4;
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}
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// now do the rest as mentioned in STATE.RXBV
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while ((bytes_in_buf > 0) && (fifo_fill_lev > 0)) {
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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;
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if (rx_valid_cnt == 0)
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break;
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if (rx_valid_cnt > bytes_in_buf)
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rx_valid_cnt = bytes_in_buf;
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tmp_val = READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_RB);
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for (i = 0; i < rx_valid_cnt; i++)
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{
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*info->rxbuf_ptr = (tmp_val >> (8 * (rx_valid_cnt - i - 1))) & 0xff;
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bytes_in_buf--;
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info->rxbuf_ptr++;
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}
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info->stats.rxBytes += rx_valid_cnt;
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}
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// check if transfer is complete
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if (info->rxbuf_ptr >= info->rxbuf_end)
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{
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disable_irq(info->rxirq);
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wake_up_interruptible (&info->rwait);
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} else if ((info->opts.modeRxTx == IFX_SSC_MODE_RX) && (READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_RXCNT) == 0))
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{
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if (info->rxbuf_end - info->rxbuf_ptr < IFX_SSC_RXREQ_BLOCK_SIZE)
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WRITE_PERIPHERAL_REGISTER ((info->rxbuf_end - info->rxbuf_ptr) << IFX_SSC_RXREQ_RXCOUNT_OFFSET, info->mapbase + IFX_SSC_RXREQ);
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else
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WRITE_PERIPHERAL_REGISTER (IFX_SSC_RXREQ_BLOCK_SIZE << IFX_SSC_RXREQ_RXCOUNT_OFFSET, info->mapbase + IFX_SSC_RXREQ);
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}
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}
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inline static void
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tx_int (struct ifx_ssc_port *info)
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{
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int fifo_space, fill, i;
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fifo_space = ((READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_ID) & IFX_SSC_PERID_TXFS_MASK) >> IFX_SSC_PERID_TXFS_OFFSET)
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- ((READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_FSTAT) & IFX_SSC_FSTAT_TRANSMIT_WORDS_MASK) >> IFX_SSC_FSTAT_TRANSMIT_WORDS_OFFSET);
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if (fifo_space == 0)
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return;
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fill = info->txbuf_end - info->txbuf_ptr;
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if (fill > fifo_space * 4)
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fill = fifo_space * 4;
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for (i = 0; i < fill / 4; i++)
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{
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// at first 32 bit access
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WRITE_PERIPHERAL_REGISTER (*(UINT32 *) info->txbuf_ptr, info->mapbase + IFX_SSC_TB);
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info->txbuf_ptr += 4;
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}
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fifo_space -= fill / 4;
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info->stats.txBytes += fill & ~0x3;
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fill &= 0x3;
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if ((fifo_space > 0) & (fill > 1))
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{
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// trailing 16 bit access
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WRITE_PERIPHERAL_REGISTER_16 (*(UINT16 *) info->txbuf_ptr, info->mapbase + IFX_SSC_TB);
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info->txbuf_ptr += 2;
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info->stats.txBytes += 2;
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fifo_space--;
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fill -= 2;
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}
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if ((fifo_space > 0) & (fill > 0))
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{
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// trailing 8 bit access
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WRITE_PERIPHERAL_REGISTER_8 (*(UINT8 *) info->txbuf_ptr, info->mapbase + IFX_SSC_TB);
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info->txbuf_ptr++;
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info->stats.txBytes++;
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}
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// check if transmission complete
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if (info->txbuf_ptr >= info->txbuf_end)
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{
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disable_irq(info->txirq);
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kfree (info->txbuf);
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info->txbuf = NULL;
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}
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}
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irqreturn_t
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ifx_ssc_rx_int (int irq, void *dev_id)
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{
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struct ifx_ssc_port *info = (struct ifx_ssc_port *) dev_id;
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rx_int (info);
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return IRQ_HANDLED;
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}
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irqreturn_t
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ifx_ssc_tx_int (int irq, void *dev_id)
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{
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struct ifx_ssc_port *info = (struct ifx_ssc_port *) dev_id;
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tx_int (info);
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return IRQ_HANDLED;
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}
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irqreturn_t
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ifx_ssc_err_int (int irq, void *dev_id)
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{
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struct ifx_ssc_port *info = (struct ifx_ssc_port *) dev_id;
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unsigned int state;
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unsigned int write_back = 0;
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unsigned long flags;
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local_irq_save (flags);
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state = READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_STATE);
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if ((state & IFX_SSC_STATE_RX_UFL) != 0) {
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info->stats.rxUnErr++;
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write_back |= IFX_SSC_WHBSTATE_CLR_RX_UFL_ERROR;
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}
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if ((state & IFX_SSC_STATE_RX_OFL) != 0) {
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info->stats.rxOvErr++;
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write_back |= IFX_SSC_WHBSTATE_CLR_RX_OFL_ERROR;
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}
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if ((state & IFX_SSC_STATE_TX_OFL) != 0) {
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info->stats.txOvErr++;
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write_back |= IFX_SSC_WHBSTATE_CLR_TX_OFL_ERROR;
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}
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if ((state & IFX_SSC_STATE_TX_UFL) != 0) {
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info->stats.txUnErr++;
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write_back |= IFX_SSC_WHBSTATE_CLR_TX_UFL_ERROR;
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}
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if ((state & IFX_SSC_STATE_MODE_ERR) != 0) {
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info->stats.modeErr++;
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write_back |= IFX_SSC_WHBSTATE_CLR_MODE_ERROR;
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}
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if (write_back)
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WRITE_PERIPHERAL_REGISTER (write_back, info->mapbase + IFX_SSC_WHBSTATE);
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local_irq_restore (flags);
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return IRQ_HANDLED;
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}
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static void
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ifx_ssc_abort (struct ifx_ssc_port *info)
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{
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unsigned long flags;
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bool enabled;
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local_irq_save (flags);
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disable_irq(info->rxirq);
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disable_irq(info->txirq);
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disable_irq(info->errirq);
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local_irq_restore (flags);
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// disable SSC (also aborts a receive request!)
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||
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// ### TO DO: Perhaps it's better to abort after the receiption of a
|
||
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// complete word. The disable cuts the transmission immediatly and
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||
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// releases the chip selects. This could result in unpredictable
|
||
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// behavior of connected external devices!
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||
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enabled = (READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_STATE) & IFX_SSC_STATE_IS_ENABLED) != 0;
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WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_CLR_ENABLE, info->mapbase + IFX_SSC_WHBSTATE);
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// flush fifos
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WRITE_PERIPHERAL_REGISTER (IFX_SSC_XFCON_FIFO_FLUSH, info->mapbase + IFX_SSC_TXFCON);
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WRITE_PERIPHERAL_REGISTER (IFX_SSC_XFCON_FIFO_FLUSH, info->mapbase + IFX_SSC_RXFCON);
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||
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// free txbuf
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||
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if (info->txbuf != NULL)
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{
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kfree (info->txbuf);
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||
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info->txbuf = NULL;
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||
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}
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||
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||
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// wakeup read process
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||
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if (info->rxbuf != NULL)
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||
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wake_up_interruptible (&info->rwait);
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||
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|
||
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// clear pending int's
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||
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mask_and_ack_danube_irq(info->rxirq);
|
||
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mask_and_ack_danube_irq(info->txirq);
|
||
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mask_and_ack_danube_irq(info->errirq);
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||
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||
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// clear error flags
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||
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WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_CLR_ALL_ERROR, info->mapbase + IFX_SSC_WHBSTATE);
|
||
|
|
||
|
if (enabled)
|
||
|
WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_SET_ENABLE, info->mapbase + IFX_SSC_WHBSTATE);
|
||
|
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* This routine is called whenever a port is opened. It enforces
|
||
|
* exclusive opening of a port and enables interrupts, etc.
|
||
|
*/
|
||
|
int
|
||
|
ifx_ssc_open (struct inode *inode, struct file *filp)
|
||
|
{
|
||
|
struct ifx_ssc_port *info;
|
||
|
int line;
|
||
|
int from_kernel = 0;
|
||
|
|
||
|
if ((inode == (struct inode *) 0) || (inode == (struct inode *) 1)) {
|
||
|
from_kernel = 1;
|
||
|
line = (int) inode;
|
||
|
} else {
|
||
|
line = MINOR (filp->f_dentry->d_inode->i_rdev);
|
||
|
filp->f_op = &ifx_ssc_fops;
|
||
|
}
|
||
|
|
||
|
/* don't open more minor devices than we can support */
|
||
|
if (line < 0 || line >= PORT_CNT)
|
||
|
return -ENXIO;
|
||
|
|
||
|
info = &isp[line];
|
||
|
|
||
|
/* exclusive open */
|
||
|
if (info->port_is_open != 0)
|
||
|
return -EBUSY;
|
||
|
info->port_is_open++;
|
||
|
|
||
|
disable_irq(info->rxirq);
|
||
|
disable_irq(info->txirq);
|
||
|
disable_irq(info->errirq);
|
||
|
|
||
|
/* Flush and enable TX/RX FIFO */
|
||
|
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);
|
||
|
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);
|
||
|
|
||
|
/* logically flush the software FIFOs */
|
||
|
info->rxbuf_ptr = 0;
|
||
|
info->txbuf_ptr = 0;
|
||
|
|
||
|
/* clear all error bits */
|
||
|
WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_CLR_ALL_ERROR, info->mapbase + IFX_SSC_WHBSTATE);
|
||
|
|
||
|
// clear pending interrupts
|
||
|
mask_and_ack_danube_irq(info->rxirq);
|
||
|
mask_and_ack_danube_irq(info->txirq);
|
||
|
mask_and_ack_danube_irq(info->errirq);
|
||
|
|
||
|
WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_SET_ENABLE, info->mapbase + IFX_SSC_WHBSTATE);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
EXPORT_SYMBOL(ifx_ssc_open);
|
||
|
|
||
|
int
|
||
|
ifx_ssc_close (struct inode *inode, struct file *filp)
|
||
|
{
|
||
|
struct ifx_ssc_port *info;
|
||
|
int idx;
|
||
|
|
||
|
if ((inode == (struct inode *) 0) || (inode == (struct inode *) 1))
|
||
|
idx = (int) inode;
|
||
|
else
|
||
|
idx = MINOR (filp->f_dentry->d_inode->i_rdev);
|
||
|
|
||
|
if (idx < 0 || idx >= PORT_CNT)
|
||
|
return -ENXIO;
|
||
|
|
||
|
info = &isp[idx];
|
||
|
if (!info)
|
||
|
return -ENXIO;
|
||
|
|
||
|
WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_CLR_ENABLE, info->mapbase + IFX_SSC_WHBSTATE);
|
||
|
|
||
|
ifx_ssc_abort(info);
|
||
|
|
||
|
info->port_is_open--;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
EXPORT_SYMBOL(ifx_ssc_close);
|
||
|
|
||
|
static ssize_t
|
||
|
ifx_ssc_read_helper_poll (struct ifx_ssc_port *info, char *buf, size_t len, int from_kernel)
|
||
|
{
|
||
|
ssize_t ret_val;
|
||
|
unsigned long flags;
|
||
|
|
||
|
if (info->opts.modeRxTx == IFX_SSC_MODE_TX)
|
||
|
return -EFAULT;
|
||
|
local_irq_save (flags);
|
||
|
info->rxbuf_ptr = info->rxbuf;
|
||
|
info->rxbuf_end = info->rxbuf + len;
|
||
|
local_irq_restore (flags);
|
||
|
/* Vinetic driver always works in IFX_SSC_MODE_RXTX */
|
||
|
/* TXRX in poll mode */
|
||
|
while (info->rxbuf_ptr < info->rxbuf_end)
|
||
|
{
|
||
|
if (info->txbuf_ptr < info->txbuf_end)
|
||
|
tx_int (info);
|
||
|
|
||
|
rx_int (info);
|
||
|
};
|
||
|
|
||
|
ret_val = info->rxbuf_ptr - info->rxbuf;
|
||
|
|
||
|
return ret_val;
|
||
|
}
|
||
|
|
||
|
static ssize_t
|
||
|
ifx_ssc_read_helper (struct ifx_ssc_port *info, char *buf, size_t len, int from_kernel)
|
||
|
{
|
||
|
ssize_t ret_val;
|
||
|
unsigned long flags;
|
||
|
DECLARE_WAITQUEUE (wait, current);
|
||
|
|
||
|
if (info->opts.modeRxTx == IFX_SSC_MODE_TX)
|
||
|
return -EFAULT;
|
||
|
|
||
|
local_irq_save (flags);
|
||
|
info->rxbuf_ptr = info->rxbuf;
|
||
|
info->rxbuf_end = info->rxbuf + len;
|
||
|
|
||
|
if (info->opts.modeRxTx == IFX_SSC_MODE_RXTX)
|
||
|
{
|
||
|
if ((info->txbuf == NULL) || (info->txbuf != info->txbuf_ptr) || (info->txbuf_end != len + info->txbuf))
|
||
|
{
|
||
|
local_irq_restore (flags);
|
||
|
printk ("IFX SSC - %s: write must be called before calling " "read in combined RX/TX!\n", __func__);
|
||
|
return -EFAULT;
|
||
|
}
|
||
|
|
||
|
local_irq_restore(flags);
|
||
|
tx_int (info);
|
||
|
|
||
|
if (info->txbuf_ptr < info->txbuf_end)
|
||
|
enable_irq(info->txirq);
|
||
|
|
||
|
enable_irq(info->rxirq);
|
||
|
} else {
|
||
|
local_irq_restore(flags);
|
||
|
if (READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_RXCNT) & IFX_SSC_RXCNT_TODO_MASK)
|
||
|
return -EBUSY;
|
||
|
enable_irq(info->rxirq);
|
||
|
if (len < IFX_SSC_RXREQ_BLOCK_SIZE)
|
||
|
WRITE_PERIPHERAL_REGISTER (len << IFX_SSC_RXREQ_RXCOUNT_OFFSET, info->mapbase + IFX_SSC_RXREQ);
|
||
|
else
|
||
|
WRITE_PERIPHERAL_REGISTER (IFX_SSC_RXREQ_BLOCK_SIZE << IFX_SSC_RXREQ_RXCOUNT_OFFSET, info->mapbase + IFX_SSC_RXREQ);
|
||
|
}
|
||
|
|
||
|
__add_wait_queue (&info->rwait, &wait);
|
||
|
set_current_state (TASK_INTERRUPTIBLE);
|
||
|
|
||
|
do {
|
||
|
local_irq_save (flags);
|
||
|
if (info->rxbuf_ptr >= info->rxbuf_end)
|
||
|
break;
|
||
|
|
||
|
local_irq_restore (flags);
|
||
|
|
||
|
if (signal_pending (current))
|
||
|
{
|
||
|
ret_val = -ERESTARTSYS;
|
||
|
goto out;
|
||
|
}
|
||
|
schedule();
|
||
|
} while (1);
|
||
|
|
||
|
ret_val = info->rxbuf_ptr - info->rxbuf;
|
||
|
local_irq_restore (flags);
|
||
|
|
||
|
out:
|
||
|
current->state = TASK_RUNNING;
|
||
|
__remove_wait_queue (&info->rwait, &wait);
|
||
|
|
||
|
return (ret_val);
|
||
|
}
|
||
|
|
||
|
static ssize_t
|
||
|
ifx_ssc_write_helper (struct ifx_ssc_port *info, const char *buf,
|
||
|
size_t len, int from_kernel)
|
||
|
{
|
||
|
if (info->opts.modeRxTx == IFX_SSC_MODE_RX)
|
||
|
return -EFAULT;
|
||
|
|
||
|
info->txbuf_ptr = info->txbuf;
|
||
|
info->txbuf_end = len + info->txbuf;
|
||
|
if (info->opts.modeRxTx == IFX_SSC_MODE_TX)
|
||
|
{
|
||
|
tx_int (info);
|
||
|
if (info->txbuf_ptr < info->txbuf_end)
|
||
|
{
|
||
|
enable_irq(info->txirq);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return len;
|
||
|
}
|
||
|
|
||
|
ssize_t
|
||
|
ifx_ssc_kread (int port, char *kbuf, size_t len)
|
||
|
{
|
||
|
struct ifx_ssc_port *info;
|
||
|
ssize_t ret_val;
|
||
|
|
||
|
if (port < 0 || port >= PORT_CNT)
|
||
|
return -ENXIO;
|
||
|
|
||
|
if (len == 0)
|
||
|
return 0;
|
||
|
|
||
|
info = &isp[port];
|
||
|
|
||
|
if (info->rxbuf != NULL)
|
||
|
{
|
||
|
printk ("SSC device busy\n");
|
||
|
return -EBUSY;
|
||
|
}
|
||
|
|
||
|
info->rxbuf = kbuf;
|
||
|
if (info->rxbuf == NULL)
|
||
|
{
|
||
|
printk ("SSC device error\n");
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
ret_val = ifx_ssc_read_helper_poll (info, kbuf, len, 1);
|
||
|
info->rxbuf = NULL;
|
||
|
|
||
|
disable_irq(info->rxirq);
|
||
|
|
||
|
return ret_val;
|
||
|
}
|
||
|
EXPORT_SYMBOL(ifx_ssc_kread);
|
||
|
|
||
|
ssize_t
|
||
|
ifx_ssc_kwrite (int port, const char *kbuf, size_t len)
|
||
|
{
|
||
|
struct ifx_ssc_port *info;
|
||
|
ssize_t ret_val;
|
||
|
|
||
|
if (port < 0 || port >= PORT_CNT)
|
||
|
return -ENXIO;
|
||
|
|
||
|
if (len == 0)
|
||
|
return 0;
|
||
|
|
||
|
info = &isp[port];
|
||
|
|
||
|
// check if transmission in progress
|
||
|
if (info->txbuf != NULL)
|
||
|
return -EBUSY;
|
||
|
|
||
|
info->txbuf = (char *) kbuf;
|
||
|
|
||
|
ret_val = ifx_ssc_write_helper (info, info->txbuf, len, 1);
|
||
|
|
||
|
if (ret_val < 0)
|
||
|
info->txbuf = NULL;
|
||
|
|
||
|
return ret_val;
|
||
|
}
|
||
|
EXPORT_SYMBOL(ifx_ssc_kwrite);
|
||
|
|
||
|
static ssize_t
|
||
|
ifx_ssc_read (struct file *filp, char *ubuf, size_t len, loff_t * off)
|
||
|
{
|
||
|
ssize_t ret_val;
|
||
|
int idx;
|
||
|
struct ifx_ssc_port *info;
|
||
|
|
||
|
idx = MINOR (filp->f_dentry->d_inode->i_rdev);
|
||
|
info = &isp[idx];
|
||
|
|
||
|
if (info->rxbuf != NULL)
|
||
|
return -EBUSY;
|
||
|
|
||
|
info->rxbuf = kmalloc (len + 3, GFP_KERNEL);
|
||
|
if (info->rxbuf == NULL)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
ret_val = ifx_ssc_read_helper (info, info->rxbuf, len, 0);
|
||
|
if (copy_to_user ((void *) ubuf, info->rxbuf, ret_val) != 0)
|
||
|
ret_val = -EFAULT;
|
||
|
|
||
|
disable_irq(info->rxirq);
|
||
|
|
||
|
kfree (info->rxbuf);
|
||
|
info->rxbuf = NULL;
|
||
|
|
||
|
return (ret_val);
|
||
|
}
|
||
|
|
||
|
static ssize_t
|
||
|
ifx_ssc_write (struct file *filp, const char *ubuf, size_t len, loff_t * off)
|
||
|
{
|
||
|
int idx;
|
||
|
struct ifx_ssc_port *info;
|
||
|
int ret_val;
|
||
|
|
||
|
if (len == 0)
|
||
|
return (0);
|
||
|
|
||
|
idx = MINOR (filp->f_dentry->d_inode->i_rdev);
|
||
|
info = &isp[idx];
|
||
|
|
||
|
if (info->txbuf != NULL)
|
||
|
return -EBUSY;
|
||
|
|
||
|
info->txbuf = kmalloc (len + 3, GFP_KERNEL);
|
||
|
if (info->txbuf == NULL)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
ret_val = copy_from_user (info->txbuf, ubuf, len);
|
||
|
if (ret_val == 0)
|
||
|
ret_val = ifx_ssc_write_helper (info, info->txbuf, len, 0);
|
||
|
else
|
||
|
ret_val = -EFAULT;
|
||
|
|
||
|
if (ret_val < 0)
|
||
|
{
|
||
|
kfree (info->txbuf);
|
||
|
info->txbuf = NULL;
|
||
|
}
|
||
|
|
||
|
return (ret_val);
|
||
|
}
|
||
|
|
||
|
static struct ifx_ssc_frm_status *
|
||
|
ifx_ssc_frm_status_get (struct ifx_ssc_port *info)
|
||
|
{
|
||
|
unsigned long tmp;
|
||
|
|
||
|
tmp = READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_SFSTAT);
|
||
|
info->frm_status.DataBusy = (tmp & IFX_SSC_SFSTAT_IN_DATA) > 0;
|
||
|
info->frm_status.PauseBusy = (tmp & IFX_SSC_SFSTAT_IN_PAUSE) > 0;
|
||
|
info->frm_status.DataCount = (tmp & IFX_SSC_SFSTAT_DATA_COUNT_MASK) >> IFX_SSC_SFSTAT_DATA_COUNT_OFFSET;
|
||
|
info->frm_status.PauseCount = (tmp & IFX_SSC_SFSTAT_PAUSE_COUNT_MASK) >> IFX_SSC_SFSTAT_PAUSE_COUNT_OFFSET;
|
||
|
tmp = READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_SFCON);
|
||
|
info->frm_status.EnIntAfterData = (tmp & IFX_SSC_SFCON_FIR_ENABLE_BEFORE_PAUSE) > 0;
|
||
|
info->frm_status.EnIntAfterPause = (tmp & IFX_SSC_SFCON_FIR_ENABLE_AFTER_PAUSE) > 0;
|
||
|
|
||
|
return &info->frm_status;
|
||
|
}
|
||
|
|
||
|
|
||
|
static struct ifx_ssc_frm_opts *
|
||
|
ifx_ssc_frm_control_get (struct ifx_ssc_port *info)
|
||
|
{
|
||
|
unsigned long tmp;
|
||
|
|
||
|
tmp = READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_SFCON);
|
||
|
info->frm_opts.FrameEnable = (tmp & IFX_SSC_SFCON_SF_ENABLE) > 0;
|
||
|
info->frm_opts.DataLength = (tmp & IFX_SSC_SFCON_DATA_LENGTH_MASK) >> IFX_SSC_SFCON_DATA_LENGTH_OFFSET;
|
||
|
info->frm_opts.PauseLength = (tmp & IFX_SSC_SFCON_PAUSE_LENGTH_MASK) >> IFX_SSC_SFCON_PAUSE_LENGTH_OFFSET;
|
||
|
info->frm_opts.IdleData = (tmp & IFX_SSC_SFCON_PAUSE_DATA_MASK) >> IFX_SSC_SFCON_PAUSE_DATA_OFFSET;
|
||
|
info->frm_opts.IdleClock = (tmp & IFX_SSC_SFCON_PAUSE_CLOCK_MASK) >> IFX_SSC_SFCON_PAUSE_CLOCK_OFFSET;
|
||
|
info->frm_opts.StopAfterPause = (tmp & IFX_SSC_SFCON_STOP_AFTER_PAUSE) > 0;
|
||
|
|
||
|
return &info->frm_opts;
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ifx_ssc_frm_control_set (struct ifx_ssc_port *info)
|
||
|
{
|
||
|
unsigned long tmp;
|
||
|
|
||
|
// check parameters
|
||
|
if ((info->frm_opts.DataLength > IFX_SSC_SFCON_DATA_LENGTH_MAX)
|
||
|
|| (info->frm_opts.DataLength < 1)
|
||
|
|| (info->frm_opts.PauseLength > IFX_SSC_SFCON_PAUSE_LENGTH_MAX)
|
||
|
|| (info->frm_opts.PauseLength < 1)
|
||
|
|| (info->frm_opts.IdleData & ~(IFX_SSC_SFCON_PAUSE_DATA_MASK >> IFX_SSC_SFCON_PAUSE_DATA_OFFSET))
|
||
|
|| (info->frm_opts.IdleClock & ~(IFX_SSC_SFCON_PAUSE_CLOCK_MASK >> IFX_SSC_SFCON_PAUSE_CLOCK_OFFSET)))
|
||
|
return -EINVAL;
|
||
|
|
||
|
// read interrupt bits (they're not changed here)
|
||
|
tmp = READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_SFCON) &
|
||
|
(IFX_SSC_SFCON_FIR_ENABLE_BEFORE_PAUSE | IFX_SSC_SFCON_FIR_ENABLE_AFTER_PAUSE);
|
||
|
|
||
|
// set all values with respect to it's bit position (for data and pause
|
||
|
// length set N-1)
|
||
|
tmp = (info->frm_opts.DataLength - 1) << IFX_SSC_SFCON_DATA_LENGTH_OFFSET;
|
||
|
tmp |= (info->frm_opts.PauseLength - 1) << IFX_SSC_SFCON_PAUSE_LENGTH_OFFSET;
|
||
|
tmp |= info->frm_opts.IdleData << IFX_SSC_SFCON_PAUSE_DATA_OFFSET;
|
||
|
tmp |= info->frm_opts.IdleClock << IFX_SSC_SFCON_PAUSE_CLOCK_OFFSET;
|
||
|
tmp |= info->frm_opts.FrameEnable * IFX_SSC_SFCON_SF_ENABLE;
|
||
|
tmp |= info->frm_opts.StopAfterPause * IFX_SSC_SFCON_STOP_AFTER_PAUSE;
|
||
|
|
||
|
WRITE_PERIPHERAL_REGISTER(tmp, info->mapbase + IFX_SSC_SFCON);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ifx_ssc_rxtx_mode_set (struct ifx_ssc_port *info, unsigned int val)
|
||
|
{
|
||
|
unsigned long tmp;
|
||
|
|
||
|
if (!(info) || (val & ~(IFX_SSC_MODE_MASK)))
|
||
|
return -EINVAL;
|
||
|
|
||
|
if ((READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_STATE) & IFX_SSC_STATE_BUSY)
|
||
|
|| (READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_RXCNT) & IFX_SSC_RXCNT_TODO_MASK))
|
||
|
return -EBUSY;
|
||
|
|
||
|
tmp = (READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_CON) & ~(IFX_SSC_CON_RX_OFF | IFX_SSC_CON_TX_OFF)) | (val);
|
||
|
WRITE_PERIPHERAL_REGISTER (tmp, info->mapbase + IFX_SSC_CON);
|
||
|
info->opts.modeRxTx = val;
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ifx_ssc_sethwopts (struct ifx_ssc_port *info)
|
||
|
{
|
||
|
unsigned long flags, bits;
|
||
|
struct ifx_ssc_hwopts *opts = &info->opts;
|
||
|
|
||
|
if ((opts->dataWidth < IFX_SSC_MIN_DATA_WIDTH)
|
||
|
|| (opts->dataWidth > IFX_SSC_MAX_DATA_WIDTH))
|
||
|
return -EINVAL;
|
||
|
|
||
|
bits = (opts->dataWidth - 1) << IFX_SSC_CON_DATA_WIDTH_OFFSET;
|
||
|
bits |= IFX_SSC_CON_ENABLE_BYTE_VALID;
|
||
|
|
||
|
if (opts->rxOvErrDetect)
|
||
|
bits |= IFX_SSC_CON_RX_OFL_CHECK;
|
||
|
if (opts->rxUndErrDetect)
|
||
|
bits |= IFX_SSC_CON_RX_UFL_CHECK;
|
||
|
if (opts->txOvErrDetect)
|
||
|
bits |= IFX_SSC_CON_TX_OFL_CHECK;
|
||
|
if (opts->txUndErrDetect)
|
||
|
bits |= IFX_SSC_CON_TX_UFL_CHECK;
|
||
|
if (opts->loopBack)
|
||
|
bits |= IFX_SSC_CON_LOOPBACK_MODE;
|
||
|
if (opts->echoMode)
|
||
|
bits |= IFX_SSC_CON_ECHO_MODE_ON;
|
||
|
if (opts->headingControl)
|
||
|
bits |= IFX_SSC_CON_MSB_FIRST;
|
||
|
if (opts->clockPhase)
|
||
|
bits |= IFX_SSC_CON_LATCH_THEN_SHIFT;
|
||
|
if (opts->clockPolarity)
|
||
|
bits |= IFX_SSC_CON_CLOCK_FALL;
|
||
|
|
||
|
switch (opts->modeRxTx)
|
||
|
{
|
||
|
case IFX_SSC_MODE_TX:
|
||
|
bits |= IFX_SSC_CON_RX_OFF;
|
||
|
break;
|
||
|
case IFX_SSC_MODE_RX:
|
||
|
bits |= IFX_SSC_CON_TX_OFF;
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
local_irq_save (flags);
|
||
|
|
||
|
WRITE_PERIPHERAL_REGISTER (bits, info->mapbase + IFX_SSC_CON);
|
||
|
WRITE_PERIPHERAL_REGISTER ((info->opts.gpoCs << IFX_SSC_GPOCON_ISCSB0_POS) |
|
||
|
(info->opts.gpoInv << IFX_SSC_GPOCON_INVOUT0_POS), info->mapbase + IFX_SSC_GPOCON);
|
||
|
|
||
|
WRITE_PERIPHERAL_REGISTER (info->opts.gpoCs << IFX_SSC_WHBGPOSTAT_SETOUT0_POS, info->mapbase + IFX_SSC_WHBGPOSTAT);
|
||
|
|
||
|
//master mode
|
||
|
if (opts->masterSelect)
|
||
|
WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_SET_MASTER_SELECT, info->mapbase + IFX_SSC_WHBSTATE);
|
||
|
else
|
||
|
WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_CLR_MASTER_SELECT, info->mapbase + IFX_SSC_WHBSTATE);
|
||
|
|
||
|
// init serial framing
|
||
|
WRITE_PERIPHERAL_REGISTER (0, info->mapbase + IFX_SSC_SFCON);
|
||
|
/* set up the port pins */
|
||
|
//check for general requirements to switch (external) pad/pin characteristics
|
||
|
/* TODO: P0.9 SPI_CS4, P0.10 SPI_CS5, P 0.11 SPI_CS6, because of ASC0 */
|
||
|
/* p0.15 SPI_CS1(EEPROM), P0.13 SPI_CS3, */
|
||
|
/* Set p0.15 to alternative 01, others to 00 (In/OUT) */
|
||
|
*(DANUBE_GPIO_P0_DIR) = (*DANUBE_GPIO_P0_DIR) | (0xA000);
|
||
|
*(DANUBE_GPIO_P0_ALTSEL0) = (((*DANUBE_GPIO_P0_ALTSEL0) | (0x8000)) & (~(0x2000)));
|
||
|
*(DANUBE_GPIO_P0_ALTSEL1) = (((*DANUBE_GPIO_P0_ALTSEL1) & (~0x8000)) & (~(0x2000)));
|
||
|
*(DANUBE_GPIO_P0_OD) = (*DANUBE_GPIO_P0_OD) | 0xA000;
|
||
|
|
||
|
/* p1.6 SPI_CS2(SFLASH), p1.0 SPI_DIN, p1.1 SPI_DOUT, p1.2 SPI_CLK */
|
||
|
*(DANUBE_GPIO_P1_DIR) = ((*DANUBE_GPIO_P1_DIR) | (0x46)) & (~1);
|
||
|
*(DANUBE_GPIO_P1_ALTSEL0) = ((*DANUBE_GPIO_P1_ALTSEL0) | (0x47));
|
||
|
*(DANUBE_GPIO_P1_ALTSEL1) = (*DANUBE_GPIO_P1_ALTSEL1) & (~0x47);
|
||
|
*(DANUBE_GPIO_P1_OD) = (*DANUBE_GPIO_P1_OD) | 0x0046;
|
||
|
|
||
|
/*CS3 */
|
||
|
/*TODO: CS4 CS5 CS6 */
|
||
|
*DANUBE_GPIO_P0_OUT = ((*DANUBE_GPIO_P0_OUT) | 0x2000);
|
||
|
|
||
|
local_irq_restore (flags);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ifx_ssc_set_baud (struct ifx_ssc_port *info, unsigned int baud)
|
||
|
{
|
||
|
unsigned int ifx_ssc_clock;
|
||
|
unsigned int br;
|
||
|
unsigned long flags;
|
||
|
bool enabled;
|
||
|
int retval = 0;
|
||
|
|
||
|
ifx_ssc_clock = ifx_ssc_get_kernel_clk(info);
|
||
|
if (ifx_ssc_clock == 0)
|
||
|
{
|
||
|
retval = -EINVAL;
|
||
|
goto out;
|
||
|
}
|
||
|
|
||
|
local_irq_save (flags);
|
||
|
|
||
|
enabled = (READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_STATE) & IFX_SSC_STATE_IS_ENABLED);
|
||
|
WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_CLR_ENABLE, info->mapbase + IFX_SSC_WHBSTATE);
|
||
|
|
||
|
br = (((ifx_ssc_clock >> 1) + baud / 2) / baud) - 1;
|
||
|
wmb();
|
||
|
|
||
|
if (br > 0xffff || ((br == 0) &&
|
||
|
((READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_STATE) & IFX_SSC_STATE_IS_MASTER) == 0))) {
|
||
|
local_irq_restore (flags);
|
||
|
printk ("%s: invalid baudrate %u\n", __func__, baud);
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
WRITE_PERIPHERAL_REGISTER (br, info->mapbase + IFX_SSC_BR);
|
||
|
|
||
|
if (enabled)
|
||
|
WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_SET_ENABLE, info->mapbase + IFX_SSC_WHBSTATE);
|
||
|
|
||
|
local_irq_restore(flags);
|
||
|
|
||
|
out:
|
||
|
return retval;
|
||
|
}
|
||
|
|
||
|
static int
|
||
|
ifx_ssc_hwinit (struct ifx_ssc_port *info)
|
||
|
{
|
||
|
unsigned long flags;
|
||
|
bool enabled;
|
||
|
|
||
|
enabled = (READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_STATE) & IFX_SSC_STATE_IS_ENABLED);
|
||
|
WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_CLR_ENABLE, info->mapbase + IFX_SSC_WHBSTATE);
|
||
|
|
||
|
if (ifx_ssc_sethwopts (info) < 0)
|
||
|
{
|
||
|
printk ("%s: setting the hardware options failed\n", __func__);
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
if (ifx_ssc_set_baud (info, info->baud) < 0)
|
||
|
{
|
||
|
printk ("%s: setting the baud rate failed\n", __func__);
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
local_irq_save (flags);
|
||
|
|
||
|
/* TX FIFO */
|
||
|
WRITE_PERIPHERAL_REGISTER ((IFX_SSC_DEF_TXFIFO_FL << IFX_SSC_XFCON_ITL_OFFSET) | IFX_SSC_XFCON_FIFO_ENABLE,
|
||
|
info->mapbase + IFX_SSC_TXFCON);
|
||
|
/* RX FIFO */
|
||
|
WRITE_PERIPHERAL_REGISTER ((IFX_SSC_DEF_RXFIFO_FL << IFX_SSC_XFCON_ITL_OFFSET) | IFX_SSC_XFCON_FIFO_ENABLE,
|
||
|
info->mapbase + IFX_SSC_RXFCON);
|
||
|
|
||
|
local_irq_restore (flags);
|
||
|
|
||
|
if (enabled)
|
||
|
WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_SET_ENABLE, info->mapbase + IFX_SSC_WHBSTATE);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
int
|
||
|
ifx_ssc_ioctl (struct inode *inode, struct file *filp, unsigned int cmd, unsigned long data)
|
||
|
{
|
||
|
struct ifx_ssc_port *info;
|
||
|
int line, ret_val = 0;
|
||
|
unsigned long flags;
|
||
|
unsigned long tmp;
|
||
|
int from_kernel = 0;
|
||
|
|
||
|
if ((inode == (struct inode *) 0) || (inode == (struct inode *) 1))
|
||
|
{
|
||
|
from_kernel = 1;
|
||
|
line = (int) inode;
|
||
|
} else {
|
||
|
line = MINOR (filp->f_dentry->d_inode->i_rdev);
|
||
|
}
|
||
|
|
||
|
if (line < 0 || line >= PORT_CNT)
|
||
|
return -ENXIO;
|
||
|
|
||
|
info = &isp[line];
|
||
|
|
||
|
switch (cmd)
|
||
|
{
|
||
|
case IFX_SSC_STATS_READ:
|
||
|
/* data must be a pointer to a struct ifx_ssc_statistics */
|
||
|
if (from_kernel)
|
||
|
memcpy ((void *) data, (void *) &info->stats,
|
||
|
sizeof (struct ifx_ssc_statistics));
|
||
|
else if (copy_to_user ((void *) data,
|
||
|
(void *) &info->stats,
|
||
|
sizeof (struct ifx_ssc_statistics)))
|
||
|
ret_val = -EFAULT;
|
||
|
break;
|
||
|
case IFX_SSC_STATS_RESET:
|
||
|
/* just resets the statistics counters */
|
||
|
memset ((void *) &info->stats, 0,
|
||
|
sizeof (struct ifx_ssc_statistics));
|
||
|
break;
|
||
|
case IFX_SSC_BAUD_SET:
|
||
|
/* if the buffers are not empty then the port is */
|
||
|
/* busy and we shouldn't change things on-the-fly! */
|
||
|
if (!info->txbuf || !info->rxbuf ||
|
||
|
(READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_STATE)
|
||
|
& IFX_SSC_STATE_BUSY)) {
|
||
|
ret_val = -EBUSY;
|
||
|
break;
|
||
|
}
|
||
|
/* misuse flags */
|
||
|
if (from_kernel)
|
||
|
flags = *((unsigned long *) data);
|
||
|
else if (copy_from_user ((void *) &flags,
|
||
|
(void *) data, sizeof (flags))) {
|
||
|
ret_val = -EFAULT;
|
||
|
break;
|
||
|
}
|
||
|
if (flags == 0) {
|
||
|
ret_val = -EINVAL;
|
||
|
break;
|
||
|
}
|
||
|
if (ifx_ssc_set_baud (info, flags) < 0) {
|
||
|
ret_val = -EINVAL;
|
||
|
break;
|
||
|
}
|
||
|
info->baud = flags;
|
||
|
break;
|
||
|
case IFX_SSC_BAUD_GET:
|
||
|
if (from_kernel)
|
||
|
*((unsigned int *) data) = info->baud;
|
||
|
else if (copy_to_user ((void *) data,
|
||
|
(void *) &info->baud,
|
||
|
sizeof (unsigned long)))
|
||
|
ret_val = -EFAULT;
|
||
|
break;
|
||
|
case IFX_SSC_RXTX_MODE_SET:
|
||
|
if (from_kernel)
|
||
|
tmp = *((unsigned long *) data);
|
||
|
else if (copy_from_user ((void *) &tmp,
|
||
|
(void *) data, sizeof (tmp))) {
|
||
|
ret_val = -EFAULT;
|
||
|
break;
|
||
|
}
|
||
|
ret_val = ifx_ssc_rxtx_mode_set (info, tmp);
|
||
|
break;
|
||
|
case IFX_SSC_RXTX_MODE_GET:
|
||
|
tmp = READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_CON) &
|
||
|
(~(IFX_SSC_CON_RX_OFF | IFX_SSC_CON_TX_OFF));
|
||
|
if (from_kernel)
|
||
|
*((unsigned int *) data) = tmp;
|
||
|
else if (copy_to_user ((void *) data,
|
||
|
(void *) &tmp, sizeof (tmp)))
|
||
|
ret_val = -EFAULT;
|
||
|
break;
|
||
|
|
||
|
case IFX_SSC_ABORT:
|
||
|
ifx_ssc_abort (info);
|
||
|
break;
|
||
|
|
||
|
case IFX_SSC_GPO_OUT_SET:
|
||
|
if (from_kernel)
|
||
|
tmp = *((unsigned long *) data);
|
||
|
else if (copy_from_user ((void *) &tmp,
|
||
|
(void *) data, sizeof (tmp))) {
|
||
|
ret_val = -EFAULT;
|
||
|
break;
|
||
|
}
|
||
|
if (tmp > IFX_SSC_MAX_GPO_OUT)
|
||
|
ret_val = -EINVAL;
|
||
|
else
|
||
|
WRITE_PERIPHERAL_REGISTER
|
||
|
(1 << (tmp + IFX_SSC_WHBGPOSTAT_SETOUT0_POS),
|
||
|
info->mapbase + IFX_SSC_WHBGPOSTAT);
|
||
|
break;
|
||
|
case IFX_SSC_GPO_OUT_CLR:
|
||
|
if (from_kernel)
|
||
|
tmp = *((unsigned long *) data);
|
||
|
else if (copy_from_user ((void *) &tmp,
|
||
|
(void *) data, sizeof (tmp))) {
|
||
|
ret_val = -EFAULT;
|
||
|
break;
|
||
|
}
|
||
|
if (tmp > IFX_SSC_MAX_GPO_OUT)
|
||
|
ret_val = -EINVAL;
|
||
|
else {
|
||
|
WRITE_PERIPHERAL_REGISTER
|
||
|
(1 << (tmp + IFX_SSC_WHBGPOSTAT_CLROUT0_POS),
|
||
|
info->mapbase + IFX_SSC_WHBGPOSTAT);
|
||
|
}
|
||
|
break;
|
||
|
case IFX_SSC_GPO_OUT_GET:
|
||
|
tmp = READ_PERIPHERAL_REGISTER
|
||
|
(info->mapbase + IFX_SSC_GPOSTAT);
|
||
|
if (from_kernel)
|
||
|
*((unsigned int *) data) = tmp;
|
||
|
else if (copy_to_user ((void *) data,
|
||
|
(void *) &tmp, sizeof (tmp)))
|
||
|
ret_val = -EFAULT;
|
||
|
break;
|
||
|
case IFX_SSC_FRM_STATUS_GET:
|
||
|
ifx_ssc_frm_status_get (info);
|
||
|
if (from_kernel)
|
||
|
memcpy ((void *) data, (void *) &info->frm_status,
|
||
|
sizeof (struct ifx_ssc_frm_status));
|
||
|
else if (copy_to_user ((void *) data,
|
||
|
(void *) &info->frm_status,
|
||
|
sizeof (struct ifx_ssc_frm_status)))
|
||
|
ret_val = -EFAULT;
|
||
|
break;
|
||
|
case IFX_SSC_FRM_CONTROL_GET:
|
||
|
ifx_ssc_frm_control_get (info);
|
||
|
if (from_kernel)
|
||
|
memcpy ((void *) data, (void *) &info->frm_opts,
|
||
|
sizeof (struct ifx_ssc_frm_opts));
|
||
|
else if (copy_to_user ((void *) data,
|
||
|
(void *) &info->frm_opts,
|
||
|
sizeof (struct ifx_ssc_frm_opts)))
|
||
|
ret_val = -EFAULT;
|
||
|
break;
|
||
|
case IFX_SSC_FRM_CONTROL_SET:
|
||
|
if (from_kernel)
|
||
|
memcpy ((void *) &info->frm_opts, (void *) data,
|
||
|
sizeof (struct ifx_ssc_frm_opts));
|
||
|
else if (copy_to_user ((void *) &info->frm_opts,
|
||
|
(void *) data,
|
||
|
sizeof (struct ifx_ssc_frm_opts))) {
|
||
|
ret_val = -EFAULT;
|
||
|
break;
|
||
|
}
|
||
|
ret_val = ifx_ssc_frm_control_set (info);
|
||
|
break;
|
||
|
case IFX_SSC_HWOPTS_SET:
|
||
|
/* data must be a pointer to a struct ifx_ssc_hwopts */
|
||
|
/* if the buffers are not empty then the port is */
|
||
|
/* busy and we shouldn't change things on-the-fly! */
|
||
|
if (!info->txbuf || !info->rxbuf ||
|
||
|
(READ_PERIPHERAL_REGISTER (info->mapbase + IFX_SSC_STATE)
|
||
|
& IFX_SSC_STATE_BUSY)) {
|
||
|
ret_val = -EBUSY;
|
||
|
break;
|
||
|
}
|
||
|
if (from_kernel)
|
||
|
memcpy ((void *) &info->opts, (void *) data,
|
||
|
sizeof (struct ifx_ssc_hwopts));
|
||
|
else if (copy_from_user ((void *) &info->opts,
|
||
|
(void *) data,
|
||
|
sizeof (struct ifx_ssc_hwopts))) {
|
||
|
ret_val = -EFAULT;
|
||
|
break;
|
||
|
}
|
||
|
if (ifx_ssc_hwinit (info) < 0) {
|
||
|
ret_val = -EIO;
|
||
|
}
|
||
|
break;
|
||
|
case IFX_SSC_HWOPTS_GET:
|
||
|
/* data must be a pointer to a struct ifx_ssc_hwopts */
|
||
|
if (from_kernel)
|
||
|
memcpy ((void *) data, (void *) &info->opts,
|
||
|
sizeof (struct ifx_ssc_hwopts));
|
||
|
else if (copy_to_user ((void *) data,
|
||
|
(void *) &info->opts,
|
||
|
sizeof (struct ifx_ssc_hwopts)))
|
||
|
ret_val = -EFAULT;
|
||
|
break;
|
||
|
default:
|
||
|
ret_val = -ENOIOCTLCMD;
|
||
|
}
|
||
|
|
||
|
return ret_val;
|
||
|
}
|
||
|
EXPORT_SYMBOL(ifx_ssc_ioctl);
|
||
|
|
||
|
static int
|
||
|
ifx_ssc1_read_proc (char *page, char **start, off_t offset, int count, int *eof, void *data)
|
||
|
{
|
||
|
int off = 0;
|
||
|
unsigned long flags;
|
||
|
|
||
|
local_save_flags(flags);
|
||
|
local_irq_disable();
|
||
|
|
||
|
off += sprintf (page + off, "Statistics for Infineon Synchronous Serial Controller SSC1\n");
|
||
|
off += sprintf (page + off, "RX overflow errors %d\n", isp[0].stats.rxOvErr);
|
||
|
off += sprintf (page + off, "RX underflow errors %d\n", isp[0].stats.rxUnErr);
|
||
|
off += sprintf (page + off, "TX overflow errors %d\n", isp[0].stats.txOvErr);
|
||
|
off += sprintf (page + off, "TX underflow errors %d\n", isp[0].stats.txUnErr);
|
||
|
off += sprintf (page + off, "Abort errors %d\n", isp[0].stats.abortErr);
|
||
|
off += sprintf (page + off, "Mode errors %d\n", isp[0].stats.modeErr);
|
||
|
off += sprintf (page + off, "RX Bytes %d\n", isp[0].stats.rxBytes);
|
||
|
off += sprintf (page + off, "TX Bytes %d\n", isp[0].stats.txBytes);
|
||
|
|
||
|
local_irq_restore(flags);
|
||
|
*eof = 1;
|
||
|
|
||
|
return off;
|
||
|
}
|
||
|
|
||
|
int __init
|
||
|
ifx_ssc_init (void)
|
||
|
{
|
||
|
struct ifx_ssc_port *info;
|
||
|
int i, nbytes;
|
||
|
unsigned long flags;
|
||
|
int ret_val;
|
||
|
|
||
|
ret_val = -ENOMEM;
|
||
|
nbytes = PORT_CNT * sizeof(struct ifx_ssc_port);
|
||
|
isp = (struct ifx_ssc_port*)kmalloc(nbytes, GFP_KERNEL);
|
||
|
|
||
|
if (isp == NULL)
|
||
|
{
|
||
|
printk("%s: no memory for isp\n", __func__);
|
||
|
return (ret_val);
|
||
|
}
|
||
|
memset(isp, 0, nbytes);
|
||
|
|
||
|
ret_val = -ENXIO;
|
||
|
if ((i = register_chrdev (maj, "ssc", &ifx_ssc_fops)) < 0)
|
||
|
{
|
||
|
printk ("Unable to register major %d for the Infineon SSC\n", maj);
|
||
|
if (maj == 0)
|
||
|
{
|
||
|
goto errout;
|
||
|
} else {
|
||
|
maj = 0;
|
||
|
if ((i = register_chrdev (maj, "ssc", &ifx_ssc_fops)) < 0)
|
||
|
{
|
||
|
printk ("Unable to register major %d for the Infineon SSC\n", maj);
|
||
|
goto errout;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (maj == 0)
|
||
|
maj = i;
|
||
|
|
||
|
/* set default values in ifx_ssc_port */
|
||
|
for (i = 0; i < PORT_CNT; i++) {
|
||
|
info = &isp[i];
|
||
|
info->port_nr = i;
|
||
|
/* default values for the HwOpts */
|
||
|
info->opts.AbortErrDetect = IFX_SSC_DEF_ABRT_ERR_DETECT;
|
||
|
info->opts.rxOvErrDetect = IFX_SSC_DEF_RO_ERR_DETECT;
|
||
|
info->opts.rxUndErrDetect = IFX_SSC_DEF_RU_ERR_DETECT;
|
||
|
info->opts.txOvErrDetect = IFX_SSC_DEF_TO_ERR_DETECT;
|
||
|
info->opts.txUndErrDetect = IFX_SSC_DEF_TU_ERR_DETECT;
|
||
|
info->opts.loopBack = IFX_SSC_DEF_LOOP_BACK;
|
||
|
info->opts.echoMode = IFX_SSC_DEF_ECHO_MODE;
|
||
|
info->opts.idleValue = IFX_SSC_DEF_IDLE_DATA;
|
||
|
info->opts.clockPolarity = IFX_SSC_DEF_CLOCK_POLARITY;
|
||
|
info->opts.clockPhase = IFX_SSC_DEF_CLOCK_PHASE;
|
||
|
info->opts.headingControl = IFX_SSC_DEF_HEADING_CONTROL;
|
||
|
info->opts.dataWidth = IFX_SSC_DEF_DATA_WIDTH;
|
||
|
info->opts.modeRxTx = IFX_SSC_DEF_MODE_RXTX;
|
||
|
info->opts.gpoCs = IFX_SSC_DEF_GPO_CS;
|
||
|
info->opts.gpoInv = IFX_SSC_DEF_GPO_INV;
|
||
|
info->opts.masterSelect = IFX_SSC_DEF_MASTERSLAVE;
|
||
|
info->baud = IFX_SSC_DEF_BAUDRATE;
|
||
|
info->rxbuf = NULL;
|
||
|
info->txbuf = NULL;
|
||
|
/* values specific to SSC1 */
|
||
|
if (i == 0) {
|
||
|
info->mapbase = DANUBE_SSC1_BASE_ADDR;
|
||
|
info->txirq = DANUBE_SSC_TIR;
|
||
|
info->rxirq = DANUBE_SSC_RIR;
|
||
|
info->errirq = DANUBE_SSC_EIR;
|
||
|
}
|
||
|
|
||
|
WRITE_PERIPHERAL_REGISTER (IFX_SSC_DEF_RMC << IFX_CLC_RUN_DIVIDER_OFFSET, info->mapbase + IFX_SSC_CLC);
|
||
|
|
||
|
init_waitqueue_head (&info->rwait);
|
||
|
|
||
|
local_irq_save (flags);
|
||
|
|
||
|
// init serial framing register
|
||
|
WRITE_PERIPHERAL_REGISTER (IFX_SSC_DEF_SFCON, info->mapbase + IFX_SSC_SFCON);
|
||
|
|
||
|
ret_val = request_irq(info->txirq, ifx_ssc_tx_int, SA_INTERRUPT, "ifx_ssc_tx", info);
|
||
|
if (ret_val)
|
||
|
{
|
||
|
printk("%s: unable to get irq %d\n", __func__, info->txirq);
|
||
|
local_irq_restore(flags);
|
||
|
goto errout;
|
||
|
}
|
||
|
|
||
|
ret_val = request_irq(info->rxirq, ifx_ssc_rx_int, SA_INTERRUPT, "ifx_ssc_rx", info);
|
||
|
if (ret_val)
|
||
|
{
|
||
|
printk ("%s: unable to get irq %d\n", __func__, info->rxirq);
|
||
|
local_irq_restore (flags);
|
||
|
goto irqerr;
|
||
|
}
|
||
|
|
||
|
ret_val = request_irq(info->errirq, ifx_ssc_err_int, SA_INTERRUPT,"ifx_ssc_err", info);
|
||
|
if (ret_val)
|
||
|
{
|
||
|
printk ("%s: unable to get irq %d\n", __func__, info->errirq);
|
||
|
local_irq_restore (flags);
|
||
|
goto irqerr;
|
||
|
}
|
||
|
WRITE_PERIPHERAL_REGISTER (IFX_SSC_DEF_IRNEN, info->mapbase + IFX_SSC_IRN_EN);
|
||
|
|
||
|
enable_irq(info->txirq);
|
||
|
enable_irq(info->rxirq);
|
||
|
enable_irq(info->errirq);
|
||
|
|
||
|
local_irq_restore (flags);
|
||
|
}
|
||
|
|
||
|
for (i = 0; i < PORT_CNT; i++) {
|
||
|
info = &isp[i];
|
||
|
if (ifx_ssc_hwinit (info) < 0)
|
||
|
{
|
||
|
printk ("%s: hardware init failed for port %d\n", __func__, i);
|
||
|
goto irqerr;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
create_proc_read_entry ("driver/ssc1", 0, NULL, ifx_ssc1_read_proc, NULL);
|
||
|
|
||
|
return 0;
|
||
|
|
||
|
irqerr:
|
||
|
free_irq(isp[0].txirq, &isp[0]);
|
||
|
free_irq(isp[0].rxirq, &isp[0]);
|
||
|
free_irq(isp[0].errirq, &isp[0]);
|
||
|
errout:
|
||
|
kfree (isp);
|
||
|
return (ret_val);
|
||
|
}
|
||
|
|
||
|
void
|
||
|
ifx_ssc_cleanup_module (void)
|
||
|
{
|
||
|
int i;
|
||
|
|
||
|
for (i = 0; i < PORT_CNT; i++) {
|
||
|
WRITE_PERIPHERAL_REGISTER (IFX_SSC_WHBSTATE_CLR_ENABLE, isp[i].mapbase + IFX_SSC_WHBSTATE);
|
||
|
free_irq(isp[i].txirq, &isp[i]);
|
||
|
free_irq(isp[i].rxirq, &isp[i]);
|
||
|
free_irq(isp[i].errirq, &isp[i]);
|
||
|
}
|
||
|
kfree (isp);
|
||
|
remove_proc_entry ("driver/ssc1", NULL);
|
||
|
}
|
||
|
|
||
|
module_init(ifx_ssc_init);
|
||
|
module_exit(ifx_ssc_cleanup_module);
|
||
|
|
||
|
|
||
|
inline int
|
||
|
ifx_ssc_cs_low (u32 pin)
|
||
|
{
|
||
|
int ret = 0;
|
||
|
if ((ret = ifx_ssc_ioctl ((struct inode *) 0, NULL, IFX_SSC_GPO_OUT_CLR, (unsigned long) &pin)))
|
||
|
printk ("clear CS %d fails\n", pin);
|
||
|
wmb ();
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
EXPORT_SYMBOL(ifx_ssc_cs_low);
|
||
|
|
||
|
inline int
|
||
|
ifx_ssc_cs_high (u32 pin)
|
||
|
{
|
||
|
int ret = 0;
|
||
|
if ((ret = ifx_ssc_ioctl((struct inode *) 0, NULL, IFX_SSC_GPO_OUT_SET, (unsigned long) &pin)))
|
||
|
printk ("set CS %d fails\n", pin);
|
||
|
wmb ();
|
||
|
|
||
|
return ret;
|
||
|
}
|
||
|
EXPORT_SYMBOL(ifx_ssc_cs_high);
|
||
|
|
||
|
static int
|
||
|
ssc_session (char *tx_buf, u32 tx_len, char *rx_buf, u32 rx_len)
|
||
|
{
|
||
|
int ret = 0;
|
||
|
|
||
|
char *ssc_tx_buf = NULL;
|
||
|
char *ssc_rx_buf = NULL;
|
||
|
int eff_size = 0;
|
||
|
u8 mode = 0;
|
||
|
|
||
|
if (tx_buf == NULL && tx_len == 0 && rx_buf == NULL && rx_len == 0) {
|
||
|
printk ("invalid parameters\n");
|
||
|
ret = -EINVAL;
|
||
|
goto ssc_session_exit;
|
||
|
}
|
||
|
else if (tx_buf == NULL || tx_len == 0) {
|
||
|
if (rx_buf != NULL && rx_len != 0) {
|
||
|
mode = IFX_SSC_MODE_RX;
|
||
|
}
|
||
|
else {
|
||
|
printk ("invalid parameters\n");
|
||
|
ret = -EINVAL;
|
||
|
goto ssc_session_exit;
|
||
|
}
|
||
|
}
|
||
|
else if (rx_buf == NULL || rx_len == 0) {
|
||
|
if (tx_buf != NULL && tx_len != 0) {
|
||
|
mode = IFX_SSC_MODE_TX;
|
||
|
}
|
||
|
else {
|
||
|
printk ("invalid parameters\n");
|
||
|
ret = -EINVAL;
|
||
|
goto ssc_session_exit;
|
||
|
}
|
||
|
}
|
||
|
else {
|
||
|
mode = IFX_SSC_MODE_RXTX;
|
||
|
}
|
||
|
|
||
|
if (mode == IFX_SSC_MODE_RXTX) {
|
||
|
eff_size = tx_len + rx_len;
|
||
|
}
|
||
|
else if (mode == IFX_SSC_MODE_RX) {
|
||
|
eff_size = rx_len;
|
||
|
}
|
||
|
else {
|
||
|
eff_size = tx_len;
|
||
|
}
|
||
|
|
||
|
//4 bytes alignment, required by driver
|
||
|
/* change by TaiCheng */
|
||
|
//if (in_irq()){
|
||
|
if (1) {
|
||
|
ssc_tx_buf =
|
||
|
(char *) kmalloc (sizeof (char) *
|
||
|
((eff_size + 3) & (~3)),
|
||
|
GFP_ATOMIC);
|
||
|
ssc_rx_buf =
|
||
|
(char *) kmalloc (sizeof (char) *
|
||
|
((eff_size + 3) & (~3)),
|
||
|
GFP_ATOMIC);
|
||
|
}
|
||
|
else {
|
||
|
ssc_tx_buf =
|
||
|
(char *) kmalloc (sizeof (char) *
|
||
|
((eff_size + 3) & (~3)),
|
||
|
GFP_KERNEL);
|
||
|
ssc_rx_buf =
|
||
|
(char *) kmalloc (sizeof (char) *
|
||
|
((eff_size + 3) & (~3)),
|
||
|
GFP_KERNEL);
|
||
|
}
|
||
|
if (ssc_tx_buf == NULL || ssc_rx_buf == NULL) {
|
||
|
printk ("no memory for size of %d\n", eff_size);
|
||
|
ret = -ENOMEM;
|
||
|
goto ssc_session_exit;
|
||
|
}
|
||
|
memset ((void *) ssc_tx_buf, 0, eff_size);
|
||
|
memset ((void *) ssc_rx_buf, 0, eff_size);
|
||
|
|
||
|
if (tx_len > 0) {
|
||
|
memcpy (ssc_tx_buf, tx_buf, tx_len);
|
||
|
}
|
||
|
|
||
|
ret = ifx_ssc_kwrite (0, ssc_tx_buf, eff_size);
|
||
|
|
||
|
if (ret > 0) {
|
||
|
ssc_tx_buf = NULL; //should be freed by ifx_ssc_kwrite
|
||
|
}
|
||
|
|
||
|
if (ret != eff_size) {
|
||
|
printk ("ifx_ssc_write return %d\n", ret);
|
||
|
goto ssc_session_exit;
|
||
|
}
|
||
|
ret = ifx_ssc_kread (0, ssc_rx_buf, eff_size);
|
||
|
if (ret != eff_size) {
|
||
|
printk ("ifx_ssc_read return %d\n", ret);
|
||
|
goto ssc_session_exit;
|
||
|
}
|
||
|
|
||
|
memcpy (rx_buf, ssc_rx_buf + tx_len, rx_len);
|
||
|
|
||
|
if (mode == IFX_SSC_MODE_TX) {
|
||
|
ret = tx_len;
|
||
|
}
|
||
|
else {
|
||
|
ret = rx_len;
|
||
|
}
|
||
|
ssc_session_exit:
|
||
|
|
||
|
if (ssc_tx_buf != NULL)
|
||
|
kfree (ssc_tx_buf);
|
||
|
if (ssc_rx_buf != NULL)
|
||
|
kfree (ssc_rx_buf);
|
||
|
|
||
|
if (ret < 0) {
|
||
|
printk ("ssc session fails\n");
|
||
|
}
|
||
|
return ret;
|
||
|
}
|
||
|
|
||
|
int
|
||
|
ifx_ssc_txrx (char *tx_buf, u32 tx_len, char *rx_buf, u32 rx_len)
|
||
|
{
|
||
|
return ssc_session(tx_buf, tx_len, rx_buf, rx_len);
|
||
|
}
|
||
|
EXPORT_SYMBOL(ifx_ssc_txrx);
|
||
|
|
||
|
int
|
||
|
ifx_ssc_tx (char *tx_buf, u32 tx_len)
|
||
|
{
|
||
|
return ssc_session(tx_buf, tx_len, NULL, 0);
|
||
|
}
|
||
|
EXPORT_SYMBOL(ifx_ssc_tx);
|
||
|
|
||
|
int
|
||
|
ifx_ssc_rx (char *rx_buf, u32 rx_len)
|
||
|
{
|
||
|
return ssc_session(NULL, 0, rx_buf, rx_len);
|
||
|
}
|
||
|
EXPORT_SYMBOL(ifx_ssc_rx);
|
||
|
|
||
|
MODULE_LICENSE("GPL");
|
||
|
MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
|
||
|
MODULE_DESCRIPTION("danube ssc driver");
|
||
|
|