fmc: Delete the FMC subsystem

The FMC subsystem was created in 2012 with the ambition to
drive development of drivers for this hardware upstream.

The current implementation has architectural flaws and would
need to be revamped using real hardware to something that can
reuse existing kernel abstractions in the subsystems for e.g.
I2C, FPGA and GPIO.

We have concluded that for the mainline kernel it will be
better to delete the subsystem and start over with a clean
slate when/if an active maintainer steps up.

For details see:
https://lkml.org/lkml/2018/10/29/534

Suggested-by: Federico Vaga <federico.vaga@cern.ch>
Cc: Pat Riehecky <riehecky@fnal.gov>
Acked-by: Alessandro Rubini <rubini@gnudd.com>
Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 0 insertions, 172 deletions

diff --git a/drivers/fmc/fmc-debug.c b/drivers/fmc/fmc-debug.c
deleted file mode 100644
index 1734c7cf0e76..000000000000
--- a/drivers/fmc/fmc-debug.c
+++ /dev/null
@@ -1,172 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * Copyright (C) 2015 CERN (www.cern.ch)
- * Author: Federico Vaga <federico.vaga@cern.ch>
- */
-
-#include <linux/module.h>
-#include <linux/device.h>
-#include <linux/init.h>
-#include <linux/fs.h>
-#include <linux/debugfs.h>
-#include <linux/seq_file.h>
-#include <asm/byteorder.h>
-
-#include <linux/fmc.h>
-#include <linux/sdb.h>
-#include <linux/fmc-sdb.h>
-
-#define FMC_DBG_SDB_DUMP "dump_sdb"
-
-static char *__strip_trailing_space(char *buf, char *str, int len)
-{
-	int i = len - 1;
-
-	memcpy(buf, str, len);
-	buf[len] = '\0';
-	while (i >= 0 && buf[i] == ' ')
-		buf[i--] = '\0';
-	return buf;
-}
-
-#define __sdb_string(buf, field) ({			\
-	BUILD_BUG_ON(sizeof(buf) < sizeof(field));	\
-	__strip_trailing_space(buf, (void *)(field), sizeof(field));	\
-		})
-
-/**
- * We do not check seq_printf() errors because we want to see things in any case
- */
-static void fmc_sdb_dump_recursive(struct fmc_device *fmc, struct seq_file *s,
-				   const struct sdb_array *arr)
-{
-	unsigned long base = arr->baseaddr;
-	int i, j, n = arr->len, level = arr->level;
-	char tmp[64];
-
-	for (i = 0; i < n; i++) {
-		union  sdb_record *r;
-		struct sdb_product *p;
-		struct sdb_component *c;
-
-		r = &arr->record[i];
-		c = &r->dev.sdb_component;
-		p = &c->product;
-
-		for (j = 0; j < level; j++)
-			seq_printf(s, "   ");
-		switch (r->empty.record_type) {
-		case sdb_type_interconnect:
-			seq_printf(s, "%08llx:%08x %.19s\n",
-				   __be64_to_cpu(p->vendor_id),
-				   __be32_to_cpu(p->device_id),
-				   p->name);
-			break;
-		case sdb_type_device:
-			seq_printf(s, "%08llx:%08x %.19s (%08llx-%08llx)\n",
-				   __be64_to_cpu(p->vendor_id),
-				   __be32_to_cpu(p->device_id),
-				   p->name,
-				   __be64_to_cpu(c->addr_first) + base,
-				   __be64_to_cpu(c->addr_last) + base);
-			break;
-		case sdb_type_bridge:
-			seq_printf(s, "%08llx:%08x %.19s (bridge: %08llx)\n",
-				   __be64_to_cpu(p->vendor_id),
-				   __be32_to_cpu(p->device_id),
-				   p->name,
-				   __be64_to_cpu(c->addr_first) + base);
-			if (IS_ERR(arr->subtree[i])) {
-				seq_printf(s, "SDB: (bridge error %li)\n",
-					 PTR_ERR(arr->subtree[i]));
-				break;
-			}
-			fmc_sdb_dump_recursive(fmc, s, arr->subtree[i]);
-			break;
-		case sdb_type_integration:
-			seq_printf(s, "integration\n");
-			break;
-		case sdb_type_repo_url:
-			seq_printf(s, "Synthesis repository: %s\n",
-					  __sdb_string(tmp, r->repo_url.repo_url));
-			break;
-		case sdb_type_synthesis:
-			seq_printf(s, "Bitstream '%s' ",
-					  __sdb_string(tmp, r->synthesis.syn_name));
-			seq_printf(s, "synthesized %08x by %s ",
-					  __be32_to_cpu(r->synthesis.date),
-					  __sdb_string(tmp, r->synthesis.user_name));
-			seq_printf(s, "(%s version %x), ",
-					  __sdb_string(tmp, r->synthesis.tool_name),
-					  __be32_to_cpu(r->synthesis.tool_version));
-			seq_printf(s, "commit %pm\n",
-					  r->synthesis.commit_id);
-			break;
-		case sdb_type_empty:
-			seq_printf(s, "empty\n");
-			break;
-		default:
-			seq_printf(s, "UNKNOWN TYPE 0x%02x\n",
-				   r->empty.record_type);
-			break;
-		}
-	}
-}
-
-static int fmc_sdb_dump(struct seq_file *s, void *offset)
-{
-	struct fmc_device *fmc = s->private;
-
-	if (!fmc->sdb) {
-		seq_printf(s, "no SDB information\n");
-		return 0;
-	}
-
-	seq_printf(s, "FMC: %s (%s), slot %i, device %s\n", dev_name(fmc->hwdev),
-	fmc->carrier_name, fmc->slot_id, dev_name(&fmc->dev));
-	/* Dump SDB information */
-	fmc_sdb_dump_recursive(fmc, s, fmc->sdb);
-
-	return 0;
-}
-
-
-static int fmc_sdb_dump_open(struct inode *inode, struct file *file)
-{
-	struct fmc_device *fmc = inode->i_private;
-
-	return single_open(file, fmc_sdb_dump, fmc);
-}
-
-
-const struct file_operations fmc_dbgfs_sdb_dump = {
-	.owner = THIS_MODULE,
-	.open  = fmc_sdb_dump_open,
-	.read = seq_read,
-	.llseek = seq_lseek,
-	.release = single_release,
-};
-
-int fmc_debug_init(struct fmc_device *fmc)
-{
-	fmc->dbg_dir = debugfs_create_dir(dev_name(&fmc->dev), NULL);
-	if (IS_ERR_OR_NULL(fmc->dbg_dir)) {
-		pr_err("FMC: Cannot create debugfs\n");
-		return PTR_ERR(fmc->dbg_dir);
-	}
-
-	fmc->dbg_sdb_dump = debugfs_create_file(FMC_DBG_SDB_DUMP, 0444,
-						fmc->dbg_dir, fmc,
-						&fmc_dbgfs_sdb_dump);
-	if (IS_ERR_OR_NULL(fmc->dbg_sdb_dump))
-		pr_err("FMC: Cannot create debugfs file %s\n",
-		       FMC_DBG_SDB_DUMP);
-
-	return 0;
-}
-
-void fmc_debug_exit(struct fmc_device *fmc)
-{
-	if (fmc->dbg_dir)
-		debugfs_remove_recursive(fmc->dbg_dir);
-}