2009-06-11 07:01:45 -06:00
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/*
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* TTY over Blackfin JTAG Communication
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*
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* Copyright 2008-2009 Analog Devices Inc.
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*
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* Enter bugs at http://blackfin.uclinux.org/
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*
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* Licensed under the GPL-2 or later.
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*/
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2009-06-22 11:31:10 -06:00
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#define DRV_NAME "bfin-jtag-comm"
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#define DEV_NAME "ttyBFJC"
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#define pr_fmt(fmt) DRV_NAME ": " fmt
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2009-06-11 07:01:45 -06:00
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#include <linux/circ_buf.h>
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#include <linux/console.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/kernel.h>
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#include <linux/kthread.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/sched.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 02:04:11 -06:00
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#include <linux/slab.h>
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2009-06-11 07:01:45 -06:00
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#include <linux/tty.h>
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#include <linux/tty_driver.h>
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#include <linux/tty_flip.h>
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2011-07-26 17:09:06 -06:00
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#include <linux/atomic.h>
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2009-06-11 07:01:45 -06:00
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2009-06-22 11:31:10 -06:00
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#define pr_init(fmt, args...) ({ static const __initconst char __fmt[] = fmt; printk(__fmt, ## args); })
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2009-06-11 07:01:45 -06:00
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/* See the Debug/Emulation chapter in the HRM */
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#define EMUDOF 0x00000001 /* EMUDAT_OUT full & valid */
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#define EMUDIF 0x00000002 /* EMUDAT_IN full & valid */
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#define EMUDOOVF 0x00000004 /* EMUDAT_OUT overflow */
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#define EMUDIOVF 0x00000008 /* EMUDAT_IN overflow */
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static inline uint32_t bfin_write_emudat(uint32_t emudat)
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{
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__asm__ __volatile__("emudat = %0;" : : "d"(emudat));
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return emudat;
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}
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static inline uint32_t bfin_read_emudat(void)
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{
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uint32_t emudat;
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__asm__ __volatile__("%0 = emudat;" : "=d"(emudat));
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return emudat;
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}
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static inline uint32_t bfin_write_emudat_chars(char a, char b, char c, char d)
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{
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return bfin_write_emudat((a << 0) | (b << 8) | (c << 16) | (d << 24));
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}
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#define CIRC_SIZE 2048 /* see comment in tty_io.c:do_tty_write() */
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#define CIRC_MASK (CIRC_SIZE - 1)
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#define circ_empty(circ) ((circ)->head == (circ)->tail)
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#define circ_free(circ) CIRC_SPACE((circ)->head, (circ)->tail, CIRC_SIZE)
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#define circ_cnt(circ) CIRC_CNT((circ)->head, (circ)->tail, CIRC_SIZE)
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#define circ_byte(circ, idx) ((circ)->buf[(idx) & CIRC_MASK])
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static struct tty_driver *bfin_jc_driver;
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static struct task_struct *bfin_jc_kthread;
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2012-04-02 05:54:19 -06:00
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static struct tty_port port;
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2009-06-11 07:01:45 -06:00
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static volatile struct circ_buf bfin_jc_write_buf;
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static int
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bfin_jc_emudat_manager(void *arg)
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{
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uint32_t inbound_len = 0, outbound_len = 0;
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while (!kthread_should_stop()) {
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2012-04-02 05:54:20 -06:00
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struct tty_struct *tty = tty_port_tty_get(&port);
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2009-06-11 07:01:45 -06:00
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/* no one left to give data to, so sleep */
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2012-04-02 05:54:20 -06:00
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if (tty == NULL && circ_empty(&bfin_jc_write_buf)) {
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2009-06-22 11:31:10 -06:00
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pr_debug("waiting for readers\n");
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2009-06-11 07:01:45 -06:00
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__set_current_state(TASK_UNINTERRUPTIBLE);
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schedule();
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__set_current_state(TASK_RUNNING);
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2012-04-02 05:54:20 -06:00
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continue;
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2009-06-11 07:01:45 -06:00
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}
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/* no data available, so just chill */
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if (!(bfin_read_DBGSTAT() & EMUDIF) && circ_empty(&bfin_jc_write_buf)) {
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2009-06-22 11:31:10 -06:00
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pr_debug("waiting for data (in_len = %i) (circ: %i %i)\n",
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2009-06-11 07:01:45 -06:00
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inbound_len, bfin_jc_write_buf.tail, bfin_jc_write_buf.head);
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2012-04-02 05:54:20 -06:00
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tty_kref_put(tty);
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2009-06-11 07:01:45 -06:00
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if (inbound_len)
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schedule();
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else
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schedule_timeout_interruptible(HZ);
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continue;
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}
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/* if incoming data is ready, eat it */
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if (bfin_read_DBGSTAT() & EMUDIF) {
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2013-01-03 07:53:06 -07:00
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uint32_t emudat = bfin_read_emudat();
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if (inbound_len == 0) {
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pr_debug("incoming length: 0x%08x\n", emudat);
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inbound_len = emudat;
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} else {
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size_t num_chars = (4 <= inbound_len ? 4 : inbound_len);
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pr_debug(" incoming data: 0x%08x (pushing %zu)\n", emudat, num_chars);
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inbound_len -= num_chars;
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tty_insert_flip_string(&port, (unsigned char *)&emudat, num_chars);
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tty_flip_buffer_push(&port);
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2009-06-11 07:01:45 -06:00
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}
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}
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/* if outgoing data is ready, post it */
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if (!(bfin_read_DBGSTAT() & EMUDOF) && !circ_empty(&bfin_jc_write_buf)) {
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if (outbound_len == 0) {
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outbound_len = circ_cnt(&bfin_jc_write_buf);
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bfin_write_emudat(outbound_len);
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2009-06-22 11:31:10 -06:00
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pr_debug("outgoing length: 0x%08x\n", outbound_len);
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2009-06-11 07:01:45 -06:00
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} else {
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int tail = bfin_jc_write_buf.tail;
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size_t ate = (4 <= outbound_len ? 4 : outbound_len);
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uint32_t emudat =
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bfin_write_emudat_chars(
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circ_byte(&bfin_jc_write_buf, tail + 0),
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circ_byte(&bfin_jc_write_buf, tail + 1),
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circ_byte(&bfin_jc_write_buf, tail + 2),
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circ_byte(&bfin_jc_write_buf, tail + 3)
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);
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bfin_jc_write_buf.tail += ate;
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outbound_len -= ate;
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if (tty)
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tty_wakeup(tty);
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2009-06-22 11:31:10 -06:00
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pr_debug(" outgoing data: 0x%08x (pushing %zu)\n", emudat, ate);
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2009-06-11 07:01:45 -06:00
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}
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}
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2012-04-02 05:54:20 -06:00
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tty_kref_put(tty);
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2009-06-11 07:01:45 -06:00
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}
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__set_current_state(TASK_RUNNING);
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return 0;
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}
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static int
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bfin_jc_open(struct tty_struct *tty, struct file *filp)
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{
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2012-04-02 05:54:20 -06:00
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unsigned long flags;
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spin_lock_irqsave(&port.lock, flags);
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2012-04-02 05:54:19 -06:00
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port.count++;
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2012-04-02 05:54:20 -06:00
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spin_unlock_irqrestore(&port.lock, flags);
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tty_port_tty_set(&port, tty);
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2009-06-11 07:01:45 -06:00
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wake_up_process(bfin_jc_kthread);
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return 0;
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}
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static void
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bfin_jc_close(struct tty_struct *tty, struct file *filp)
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{
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2012-04-02 05:54:20 -06:00
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unsigned long flags;
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bool last;
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spin_lock_irqsave(&port.lock, flags);
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last = --port.count == 0;
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spin_unlock_irqrestore(&port.lock, flags);
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if (last)
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tty_port_tty_set(&port, NULL);
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2009-06-11 07:01:45 -06:00
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wake_up_process(bfin_jc_kthread);
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}
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/* XXX: we dont handle the put_char() case where we must handle count = 1 */
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static int
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bfin_jc_circ_write(const unsigned char *buf, int count)
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{
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int i;
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count = min(count, circ_free(&bfin_jc_write_buf));
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2009-06-22 11:31:10 -06:00
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pr_debug("going to write chunk of %i bytes\n", count);
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2009-06-11 07:01:45 -06:00
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for (i = 0; i < count; ++i)
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circ_byte(&bfin_jc_write_buf, bfin_jc_write_buf.head + i) = buf[i];
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bfin_jc_write_buf.head += i;
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return i;
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}
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#ifndef CONFIG_BFIN_JTAG_COMM_CONSOLE
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2011-01-25 16:07:35 -07:00
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# define console_lock()
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# define console_unlock()
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2009-06-11 07:01:45 -06:00
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#endif
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static int
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bfin_jc_write(struct tty_struct *tty, const unsigned char *buf, int count)
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{
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int i;
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2011-01-25 16:07:35 -07:00
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console_lock();
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2009-06-11 07:01:45 -06:00
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i = bfin_jc_circ_write(buf, count);
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2011-01-25 16:07:35 -07:00
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console_unlock();
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2009-06-11 07:01:45 -06:00
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wake_up_process(bfin_jc_kthread);
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return i;
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}
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static void
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bfin_jc_flush_chars(struct tty_struct *tty)
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{
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wake_up_process(bfin_jc_kthread);
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}
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static int
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bfin_jc_write_room(struct tty_struct *tty)
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{
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return circ_free(&bfin_jc_write_buf);
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}
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static int
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bfin_jc_chars_in_buffer(struct tty_struct *tty)
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{
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return circ_cnt(&bfin_jc_write_buf);
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}
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static void
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bfin_jc_wait_until_sent(struct tty_struct *tty, int timeout)
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{
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unsigned long expire = jiffies + timeout;
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while (!circ_empty(&bfin_jc_write_buf)) {
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if (signal_pending(current))
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break;
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if (time_after(jiffies, expire))
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break;
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}
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}
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|
2009-10-02 14:12:06 -06:00
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static const struct tty_operations bfin_jc_ops = {
|
2009-06-11 07:01:45 -06:00
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.open = bfin_jc_open,
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.close = bfin_jc_close,
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.write = bfin_jc_write,
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/*.put_char = bfin_jc_put_char,*/
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.flush_chars = bfin_jc_flush_chars,
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.write_room = bfin_jc_write_room,
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|
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.chars_in_buffer = bfin_jc_chars_in_buffer,
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|
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.wait_until_sent = bfin_jc_wait_until_sent,
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};
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static int __init bfin_jc_init(void)
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|
|
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{
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int ret;
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bfin_jc_kthread = kthread_create(bfin_jc_emudat_manager, NULL, DRV_NAME);
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if (IS_ERR(bfin_jc_kthread))
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|
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return PTR_ERR(bfin_jc_kthread);
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|
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|
|
ret = -ENOMEM;
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|
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bfin_jc_write_buf.head = bfin_jc_write_buf.tail = 0;
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|
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bfin_jc_write_buf.buf = kmalloc(CIRC_SIZE, GFP_KERNEL);
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if (!bfin_jc_write_buf.buf)
|
2011-03-23 17:42:56 -06:00
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goto err_buf;
|
2009-06-11 07:01:45 -06:00
|
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bfin_jc_driver = alloc_tty_driver(1);
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if (!bfin_jc_driver)
|
2011-03-23 17:42:56 -06:00
|
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goto err_driver;
|
2009-06-11 07:01:45 -06:00
|
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|
2012-11-15 01:49:56 -07:00
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|
tty_port_init(&port);
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|
2009-06-11 07:01:45 -06:00
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|
bfin_jc_driver->driver_name = DRV_NAME;
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|
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bfin_jc_driver->name = DEV_NAME;
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|
|
bfin_jc_driver->type = TTY_DRIVER_TYPE_SERIAL;
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bfin_jc_driver->subtype = SERIAL_TYPE_NORMAL;
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|
|
bfin_jc_driver->init_termios = tty_std_termios;
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|
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tty_set_operations(bfin_jc_driver, &bfin_jc_ops);
|
2012-08-07 13:47:51 -06:00
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|
tty_port_link_device(&port, bfin_jc_driver, 0);
|
2009-06-11 07:01:45 -06:00
|
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ret = tty_register_driver(bfin_jc_driver);
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|
|
if (ret)
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|
goto err;
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|
|
|
|
|
|
pr_init(KERN_INFO DRV_NAME ": initialized\n");
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
err:
|
2012-11-15 01:49:56 -07:00
|
|
|
tty_port_destroy(&port);
|
2009-06-11 07:01:45 -06:00
|
|
|
put_tty_driver(bfin_jc_driver);
|
2011-03-23 17:42:56 -06:00
|
|
|
err_driver:
|
2009-06-11 07:01:45 -06:00
|
|
|
kfree(bfin_jc_write_buf.buf);
|
2011-03-23 17:42:56 -06:00
|
|
|
err_buf:
|
2009-06-11 07:01:45 -06:00
|
|
|
kthread_stop(bfin_jc_kthread);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
module_init(bfin_jc_init);
|
|
|
|
|
|
|
|
static void __exit bfin_jc_exit(void)
|
|
|
|
{
|
|
|
|
kthread_stop(bfin_jc_kthread);
|
|
|
|
kfree(bfin_jc_write_buf.buf);
|
|
|
|
tty_unregister_driver(bfin_jc_driver);
|
|
|
|
put_tty_driver(bfin_jc_driver);
|
2012-11-15 01:49:56 -07:00
|
|
|
tty_port_destroy(&port);
|
2009-06-11 07:01:45 -06:00
|
|
|
}
|
|
|
|
module_exit(bfin_jc_exit);
|
|
|
|
|
|
|
|
#if defined(CONFIG_BFIN_JTAG_COMM_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
|
|
|
|
static void
|
|
|
|
bfin_jc_straight_buffer_write(const char *buf, unsigned count)
|
|
|
|
{
|
|
|
|
unsigned ate = 0;
|
|
|
|
while (bfin_read_DBGSTAT() & EMUDOF)
|
|
|
|
continue;
|
|
|
|
bfin_write_emudat(count);
|
|
|
|
while (ate < count) {
|
|
|
|
while (bfin_read_DBGSTAT() & EMUDOF)
|
|
|
|
continue;
|
|
|
|
bfin_write_emudat_chars(buf[ate], buf[ate+1], buf[ate+2], buf[ate+3]);
|
|
|
|
ate += 4;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#ifdef CONFIG_BFIN_JTAG_COMM_CONSOLE
|
|
|
|
static void
|
|
|
|
bfin_jc_console_write(struct console *co, const char *buf, unsigned count)
|
|
|
|
{
|
|
|
|
if (bfin_jc_kthread == NULL)
|
|
|
|
bfin_jc_straight_buffer_write(buf, count);
|
|
|
|
else
|
|
|
|
bfin_jc_circ_write(buf, count);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct tty_driver *
|
|
|
|
bfin_jc_console_device(struct console *co, int *index)
|
|
|
|
{
|
|
|
|
*index = co->index;
|
|
|
|
return bfin_jc_driver;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct console bfin_jc_console = {
|
|
|
|
.name = DEV_NAME,
|
|
|
|
.write = bfin_jc_console_write,
|
|
|
|
.device = bfin_jc_console_device,
|
|
|
|
.flags = CON_ANYTIME | CON_PRINTBUFFER,
|
|
|
|
.index = -1,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init bfin_jc_console_init(void)
|
|
|
|
{
|
|
|
|
register_console(&bfin_jc_console);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
console_initcall(bfin_jc_console_init);
|
|
|
|
#endif
|
|
|
|
|
|
|
|
#ifdef CONFIG_EARLY_PRINTK
|
|
|
|
static void __init
|
|
|
|
bfin_jc_early_write(struct console *co, const char *buf, unsigned int count)
|
|
|
|
{
|
|
|
|
bfin_jc_straight_buffer_write(buf, count);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct __initdata console bfin_jc_early_console = {
|
|
|
|
.name = "early_BFJC",
|
|
|
|
.write = bfin_jc_early_write,
|
|
|
|
.flags = CON_ANYTIME | CON_PRINTBUFFER,
|
|
|
|
.index = -1,
|
|
|
|
};
|
|
|
|
|
|
|
|
struct console * __init
|
|
|
|
bfin_jc_early_init(unsigned int port, unsigned int cflag)
|
|
|
|
{
|
|
|
|
return &bfin_jc_early_console;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
|
|
|
MODULE_AUTHOR("Mike Frysinger <vapier@gentoo.org>");
|
|
|
|
MODULE_DESCRIPTION("TTY over Blackfin JTAG Communication");
|
|
|
|
MODULE_LICENSE("GPL");
|