ARM: 9352/1: iwmmxt: Remove support for PJ4/PJ4B cores

[linux-2.6-microblaze.git] / arch / arm / kernel / pj4-cp0.c

diff --git a/arch/arm/kernel/pj4-cp0.c b/arch/arm/kernel/pj4-cp0.c
deleted file mode 100644 (file)
index 4bca809..0000000
--- a/arch/arm/kernel/pj4-cp0.c
+++ /dev/null
@@ -1,135 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * linux/arch/arm/kernel/pj4-cp0.c
- *
- * PJ4 iWMMXt coprocessor context switching and handling
- *
- * Copyright (c) 2010 Marvell International Inc.
- */
-
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/signal.h>
-#include <linux/sched.h>
-#include <linux/init.h>
-#include <linux/io.h>
-#include <asm/thread_notify.h>
-#include <asm/cputype.h>
-
-static int iwmmxt_do(struct notifier_block *self, unsigned long cmd, void *t)
-{
-       struct thread_info *thread = t;
-
-       switch (cmd) {
-       case THREAD_NOTIFY_FLUSH:
-               /*
-                * flush_thread() zeroes thread->fpstate, so no need
-                * to do anything here.
-                *
-                * FALLTHROUGH: Ensure we don't try to overwrite our newly
-                * initialised state information on the first fault.
-                */
-
-       case THREAD_NOTIFY_EXIT:
-               iwmmxt_task_release(thread);
-               break;
-
-       case THREAD_NOTIFY_SWITCH:
-               iwmmxt_task_switch(thread);
-               break;
-       }
-
-       return NOTIFY_DONE;
-}
-
-static struct notifier_block __maybe_unused iwmmxt_notifier_block = {
-       .notifier_call  = iwmmxt_do,
-};
-
-
-static u32 __init pj4_cp_access_read(void)
-{
-       u32 value;
-
-       __asm__ __volatile__ (
-               "mrc    p15, 0, %0, c1, c0, 2\n\t"
-               : "=r" (value));
-       return value;
-}
-
-static void __init pj4_cp_access_write(u32 value)
-{
-       u32 temp;
-
-       __asm__ __volatile__ (
-               "mcr    p15, 0, %1, c1, c0, 2\n\t"
-#ifdef CONFIG_THUMB2_KERNEL
-               "isb\n\t"
-#else
-               "mrc    p15, 0, %0, c1, c0, 2\n\t"
-               "mov    %0, %0\n\t"
-               "sub    pc, pc, #4\n\t"
-#endif
-               : "=r" (temp) : "r" (value));
-}
-
-static int __init pj4_get_iwmmxt_version(void)
-{
-       u32 cp_access, wcid;
-
-       cp_access = pj4_cp_access_read();
-       pj4_cp_access_write(cp_access | 0xf);
-
-       /* check if coprocessor 0 and 1 are available */
-       if ((pj4_cp_access_read() & 0xf) != 0xf) {
-               pj4_cp_access_write(cp_access);
-               return -ENODEV;
-       }
-
-       /* read iWMMXt coprocessor id register p1, c0 */
-       __asm__ __volatile__ ("mrc    p1, 0, %0, c0, c0, 0\n" : "=r" (wcid));
-
-       pj4_cp_access_write(cp_access);
-
-       /* iWMMXt v1 */
-       if ((wcid & 0xffffff00) == 0x56051000)
-               return 1;
-       /* iWMMXt v2 */
-       if ((wcid & 0xffffff00) == 0x56052000)
-               return 2;
-
-       return -EINVAL;
-}
-
-/*
- * Disable CP0/CP1 on boot, and let call_fpe() and the iWMMXt lazy
- * switch code handle iWMMXt context switching.
- */
-static int __init pj4_cp0_init(void)
-{
-       u32 __maybe_unused cp_access;
-       int vers;
-
-       if (!cpu_is_pj4())
-               return 0;
-
-       vers = pj4_get_iwmmxt_version();
-       if (vers < 0)
-               return 0;
-
-#ifndef CONFIG_IWMMXT
-       pr_info("PJ4 iWMMXt coprocessor detected, but kernel support is missing.\n");
-#else
-       cp_access = pj4_cp_access_read() & ~0xf;
-       pj4_cp_access_write(cp_access);
-
-       pr_info("PJ4 iWMMXt v%d coprocessor enabled.\n", vers);
-       elf_hwcap |= HWCAP_IWMMXT;
-       thread_register_notifier(&iwmmxt_notifier_block);
-       register_iwmmxt_undef_handler();
-#endif
-
-       return 0;
-}
-
-late_initcall(pj4_cp0_init);