c6x: remove architecture

The c6x architecture was added to the kernel in 2011 at a time when
running Linux on DSPs was widely seen as the logical evolution.
It appears the trend has gone back to running Linux on Arm based SoCs
with DSP, using a better supported software ecosystem, and having better
real-time behavior for the DSP code. An example of this is TI's own
Keystone2 platform.

The upstream kernel port appears to no longer have any users. Mark
Salter remained avaialable to review patches, but mentioned that
he no longer has access to working hardware himself. Without any
users, it's best to just remove the code completely to reduce the
work for cross-architecture code changes.

Many thanks to Mark for maintaining the code for the past ten years.

Link: https://lore.kernel.org/lkml/41dc7795afda9f776d8cd0d3075f776cf586e97c.camel@redhat.com/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 0 insertions, 84 deletions

diff --git a/arch/c6x/platforms/emif.c b/arch/c6x/platforms/emif.c
deleted file mode 100644
index 6142ecc2cd88..000000000000
--- a/arch/c6x/platforms/emif.c
+++ /dev/null
@@ -1,84 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- *  External Memory Interface
- *
- *  Copyright (C) 2011 Texas Instruments Incorporated
- *  Author: Mark Salter <msalter@redhat.com>
- */
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/io.h>
-#include <asm/soc.h>
-#include <asm/dscr.h>
-
-#define NUM_EMIFA_CHIP_ENABLES 4
-
-struct emifa_regs {
-	u32	midr;
-	u32	stat;
-	u32	reserved1[6];
-	u32	bprio;
-	u32	reserved2[23];
-	u32	cecfg[NUM_EMIFA_CHIP_ENABLES];
-	u32	reserved3[4];
-	u32	awcc;
-	u32	reserved4[7];
-	u32	intraw;
-	u32	intmsk;
-	u32	intmskset;
-	u32	intmskclr;
-};
-
-static struct of_device_id emifa_match[] __initdata = {
-	{ .compatible = "ti,c64x+emifa"	},
-	{}
-};
-
-/*
- * Parse device tree for existence of an EMIF (External Memory Interface)
- * and initialize it if found.
- */
-static int __init c6x_emifa_init(void)
-{
-	struct emifa_regs __iomem *regs;
-	struct device_node *node;
-	const __be32 *p;
-	u32 val;
-	int i, len, err;
-
-	node = of_find_matching_node(NULL, emifa_match);
-	if (!node)
-		return 0;
-
-	regs = of_iomap(node, 0);
-	if (!regs)
-		return 0;
-
-	/* look for a dscr-based enable for emifa pin buffers */
-	err = of_property_read_u32_array(node, "ti,dscr-dev-enable", &val, 1);
-	if (!err)
-		dscr_set_devstate(val, DSCR_DEVSTATE_ENABLED);
-
-	/* set up the chip enables */
-	p = of_get_property(node, "ti,emifa-ce-config", &len);
-	if (p) {
-		len /= sizeof(u32);
-		if (len > NUM_EMIFA_CHIP_ENABLES)
-			len = NUM_EMIFA_CHIP_ENABLES;
-		for (i = 0; i <= len; i++)
-			soc_writel(be32_to_cpup(&p[i]), &regs->cecfg[i]);
-	}
-
-	err = of_property_read_u32_array(node, "ti,emifa-burst-priority", &val, 1);
-	if (!err)
-		soc_writel(val, &regs->bprio);
-
-	err = of_property_read_u32_array(node, "ti,emifa-async-wait-control", &val, 1);
-	if (!err)
-		soc_writel(val, &regs->awcc);
-
-	iounmap(regs);
-	of_node_put(node);
-	return 0;
-}
-pure_initcall(c6x_emifa_init);