Merge tag 'arch-removal' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic

Pul removal of obsolete architecture ports from Arnd Bergmann:
 "This removes the entire architecture code for blackfin, cris, frv,
  m32r, metag, mn10300, score, and tile, including the associated device
  drivers.

  I have been working with the (former) maintainers for each one to
  ensure that my interpretation was right and the code is definitely
  unused in mainline kernels. Many had fond memories of working on the
  respective ports to start with and getting them included in upstream,
  but also saw no point in keeping the port alive without any users.

  In the end, it seems that while the eight architectures are extremely
  different, they all suffered the same fate: There was one company in
  charge of an SoC line, a CPU microarchitecture and a software
  ecosystem, which was more costly than licensing newer off-the-shelf
  CPU cores from a third party (typically ARM, MIPS, or RISC-V). It
  seems that all the SoC product lines are still around, but have not
  used the custom CPU architectures for several years at this point. In
  contrast, CPU instruction sets that remain popular and have actively
  maintained kernel ports tend to all be used across multiple licensees.

  [ See the new nds32 port merged in the previous commit for the next
    generation of "one company in charge of an SoC line, a CPU
    microarchitecture and a software ecosystem"   - Linus ]

  The removal came out of a discussion that is now documented at
  https://lwn.net/Articles/748074/. Unlike the original plans, I'm not
  marking any ports as deprecated but remove them all at once after I
  made sure that they are all unused. Some architectures (notably tile,
  mn10300, and blackfin) are still being shipped in products with old
  kernels, but those products will never be updated to newer kernel
  releases.

  After this series, we still have a few architectures without mainline
  gcc support:

   - unicore32 and hexagon both have very outdated gcc releases, but the
     maintainers promised to work on providing something newer. At least
     in case of hexagon, this will only be llvm, not gcc.

   - openrisc, risc-v and nds32 are still in the process of finishing
     their support or getting it added to mainline gcc in the first
     place. They all have patched gcc-7.3 ports that work to some
     degree, but complete upstream support won't happen before gcc-8.1.
     Csky posted their first kernel patch set last week, their situation
     will be similar

  [ Palmer Dabbelt points out that RISC-V support is in mainline gcc
    since gcc-7, although gcc-7.3.0 is the recommended minimum  - Linus ]"

This really says it all:

 2498 files changed, 95 insertions(+), 467668 deletions(-)

* tag 'arch-removal' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic: (74 commits)
  MAINTAINERS: UNICORE32: Change email account
  staging: iio: remove iio-trig-bfin-timer driver
  tty: hvc: remove tile driver
  tty: remove bfin_jtag_comm and hvc_bfin_jtag drivers
  serial: remove tile uart driver
  serial: remove m32r_sio driver
  serial: remove blackfin drivers
  serial: remove cris/etrax uart drivers
  usb: Remove Blackfin references in USB support
  usb: isp1362: remove blackfin arch glue
  usb: musb: remove blackfin port
  usb: host: remove tilegx platform glue
  pwm: remove pwm-bfin driver
  i2c: remove bfin-twi driver
  spi: remove blackfin related host drivers
  watchdog: remove bfin_wdt driver
  can: remove bfin_can driver
  mmc: remove bfin_sdh driver
  input: misc: remove blackfin rotary driver
  input: keyboard: remove bf54x driver
  ...

1 files changed, 0 insertions, 176 deletions

diff --git a/arch/tile/gxio/dma_queue.c b/arch/tile/gxio/dma_queue.c
deleted file mode 100644
index b7ba577d82ca..000000000000
--- a/arch/tile/gxio/dma_queue.c
+++ /dev/null
@@ -1,176 +0,0 @@
-/*
- * Copyright 2012 Tilera Corporation. All Rights Reserved.
- *
- *   This program is free software; you can redistribute it and/or
- *   modify it under the terms of the GNU General Public License
- *   as published by the Free Software Foundation, version 2.
- *
- *   This program is distributed in the hope that it will be useful, but
- *   WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- *   NON INFRINGEMENT.  See the GNU General Public License for
- *   more details.
- */
-
-#include <linux/io.h>
-#include <linux/atomic.h>
-#include <linux/module.h>
-#include <gxio/dma_queue.h>
-
-/* Wait for a memory read to complete. */
-#define wait_for_value(val)                             \
-  __asm__ __volatile__("move %0, %0" :: "r"(val))
-
-/* The index is in the low 16. */
-#define DMA_QUEUE_INDEX_MASK ((1 << 16) - 1)
-
-/*
- * The hardware descriptor-ring type.
- * This matches the types used by mpipe (MPIPE_EDMA_POST_REGION_VAL_t)
- * and trio (TRIO_PUSH_DMA_REGION_VAL_t or TRIO_PULL_DMA_REGION_VAL_t).
- * See those types for more documentation on the individual fields.
- */
-typedef union {
-	struct {
-#ifndef __BIG_ENDIAN__
-		uint64_t ring_idx:16;
-		uint64_t count:16;
-		uint64_t gen:1;
-		uint64_t __reserved:31;
-#else
-		uint64_t __reserved:31;
-		uint64_t gen:1;
-		uint64_t count:16;
-		uint64_t ring_idx:16;
-#endif
-	};
-	uint64_t word;
-} __gxio_ring_t;
-
-void __gxio_dma_queue_init(__gxio_dma_queue_t *dma_queue,
-			   void *post_region_addr, unsigned int num_entries)
-{
-	/*
-	 * Limit 65536 entry rings to 65535 credits because we only have a
-	 * 16 bit completion counter.
-	 */
-	int64_t credits = (num_entries < 65536) ? num_entries : 65535;
-
-	memset(dma_queue, 0, sizeof(*dma_queue));
-
-	dma_queue->post_region_addr = post_region_addr;
-	dma_queue->hw_complete_count = 0;
-	dma_queue->credits_and_next_index = credits << DMA_QUEUE_CREDIT_SHIFT;
-}
-
-EXPORT_SYMBOL_GPL(__gxio_dma_queue_init);
-
-void __gxio_dma_queue_update_credits(__gxio_dma_queue_t *dma_queue)
-{
-	__gxio_ring_t val;
-	uint64_t count;
-	uint64_t delta;
-	uint64_t new_count;
-
-	/*
-	 * Read the 64-bit completion count without touching the cache, so
-	 * we later avoid having to evict any sharers of this cache line
-	 * when we update it below.
-	 */
-	uint64_t orig_hw_complete_count =
-		cmpxchg(&dma_queue->hw_complete_count,
-			-1, -1);
-
-	/* Make sure the load completes before we access the hardware. */
-	wait_for_value(orig_hw_complete_count);
-
-	/* Read the 16-bit count of how many packets it has completed. */
-	val.word = __gxio_mmio_read(dma_queue->post_region_addr);
-	count = val.count;
-
-	/*
-	 * Calculate the number of completions since we last updated the
-	 * 64-bit counter.  It's safe to ignore the high bits because the
-	 * maximum credit value is 65535.
-	 */
-	delta = (count - orig_hw_complete_count) & 0xffff;
-	if (delta == 0)
-		return;
-
-	/*
-	 * Try to write back the count, advanced by delta.  If we race with
-	 * another thread, this might fail, in which case we return
-	 * immediately on the assumption that some credits are (or at least
-	 * were) available.
-	 */
-	new_count = orig_hw_complete_count + delta;
-	if (cmpxchg(&dma_queue->hw_complete_count,
-		    orig_hw_complete_count,
-		    new_count) != orig_hw_complete_count)
-		return;
-
-	/*
-	 * We succeeded in advancing the completion count; add back the
-	 * corresponding number of egress credits.
-	 */
-	__insn_fetchadd(&dma_queue->credits_and_next_index,
-			(delta << DMA_QUEUE_CREDIT_SHIFT));
-}
-
-EXPORT_SYMBOL_GPL(__gxio_dma_queue_update_credits);
-
-/*
- * A separate 'blocked' method for put() so that backtraces and
- * profiles will clearly indicate that we're wasting time spinning on
- * egress availability rather than actually posting commands.
- */
-int64_t __gxio_dma_queue_wait_for_credits(__gxio_dma_queue_t *dma_queue,
-					  int64_t modifier)
-{
-	int backoff = 16;
-	int64_t old;
-
-	do {
-		int i;
-		/* Back off to avoid spamming memory networks. */
-		for (i = backoff; i > 0; i--)
-			__insn_mfspr(SPR_PASS);
-
-		/* Check credits again. */
-		__gxio_dma_queue_update_credits(dma_queue);
-		old = __insn_fetchaddgez(&dma_queue->credits_and_next_index,
-					 modifier);
-
-		/* Calculate bounded exponential backoff for next iteration. */
-		if (backoff < 256)
-			backoff *= 2;
-	} while (old + modifier < 0);
-
-	return old;
-}
-
-EXPORT_SYMBOL_GPL(__gxio_dma_queue_wait_for_credits);
-
-int64_t __gxio_dma_queue_reserve_aux(__gxio_dma_queue_t *dma_queue,
-				     unsigned int num, int wait)
-{
-	return __gxio_dma_queue_reserve(dma_queue, num, wait != 0, true);
-}
-
-EXPORT_SYMBOL_GPL(__gxio_dma_queue_reserve_aux);
-
-int __gxio_dma_queue_is_complete(__gxio_dma_queue_t *dma_queue,
-				 int64_t completion_slot, int update)
-{
-	if (update) {
-		if (READ_ONCE(dma_queue->hw_complete_count) >
-		    completion_slot)
-			return 1;
-
-		__gxio_dma_queue_update_credits(dma_queue);
-	}
-
-	return READ_ONCE(dma_queue->hw_complete_count) > completion_slot;
-}
-
-EXPORT_SYMBOL_GPL(__gxio_dma_queue_is_complete);