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Message-Id: <20240309-sunset-v2-12-f09912574d2c@ravnborg.org>
Date: Sat, 09 Mar 2024 19:15:33 +0100
From: Sam Ravnborg via B4 Relay <devnull+sam.ravnborg.org@...nel.org>
To: "David S. Miller" <davem@...emloft.net>,
Arnd Bergmann <arnd@...nel.org>, Andreas Larsson <andreas@...sler.com>
Cc: Helge Deller <deller@....de>, Randy Dunlap <rdunlap@...radead.org>,
John Paul Adrian Glaubitz <glaubitz@...sik.fu-berlin.de>,
Mark Cave-Ayland <mark.cave-ayland@...nde.co.uk>,
Kjetil Oftedal <oftedal@...il.com>, Thomas Zimmermann <tzimmermann@...e.de>,
Alexander Viro <viro@...iv.linux.org.uk>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Alan Stern <stern@...land.harvard.edu>, Jaroslav Kysela <perex@...ex.cz>,
Takashi Iwai <tiwai@...e.com>, sparclinux@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
linux-sound@...r.kernel.org, Sam Ravnborg <sam@...nborg.org>
Subject: [PATCH v2 12/28] sparc32: Drop mbus support
From: Sam Ravnborg <sam@...nborg.org>
Only used by older SPARC HW, not used by LEON.
Signed-off-by: Sam Ravnborg <sam@...nborg.org>
Acked-by: Arnd Bergmann <arnd@...nel.org>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Arnd Bergmann <arnd@...nel.org>
Cc: Andreas Larsson <andreas@...sler.com>
---
arch/sparc/include/asm/elf_32.h | 2 -
arch/sparc/include/asm/mbus.h | 97 -----------------------------------------
arch/sparc/kernel/cpu.c | 1 -
arch/sparc/kernel/setup_32.c | 1 -
arch/sparc/mm/iommu.c | 18 ++------
arch/sparc/mm/srmmu.c | 48 --------------------
6 files changed, 3 insertions(+), 164 deletions(-)
diff --git a/arch/sparc/include/asm/elf_32.h b/arch/sparc/include/asm/elf_32.h
index 37a6016c9ccd..b2cca9be55c2 100644
--- a/arch/sparc/include/asm/elf_32.h
+++ b/arch/sparc/include/asm/elf_32.h
@@ -91,8 +91,6 @@ typedef struct {
unsigned int pr_q[64];
} elf_fpregset_t;
-#include <asm/mbus.h>
-
/*
* This is used to ensure we don't load something for the wrong architecture.
*/
diff --git a/arch/sparc/include/asm/mbus.h b/arch/sparc/include/asm/mbus.h
deleted file mode 100644
index 8b6dbe701b9b..000000000000
--- a/arch/sparc/include/asm/mbus.h
+++ /dev/null
@@ -1,97 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * mbus.h: Various defines for MBUS modules.
- *
- * Copyright (C) 1995 David S. Miller (davem@...p.rutgers.edu)
- */
-
-#ifndef _SPARC_MBUS_H
-#define _SPARC_MBUS_H
-
-#include <asm/ross.h> /* HyperSparc stuff */
-#include <asm/viking.h> /* Ugh, bug city... */
-
-enum mbus_module {
- HyperSparc = 0,
- Swift_ok = 4,
- Swift_bad_c = 5,
- Swift_lots_o_bugs = 6,
- Tsunami = 7,
- Viking_12 = 8,
- Viking_2x = 9,
- Viking_30 = 10,
- Viking_35 = 11,
- Viking_new = 12,
- TurboSparc = 13,
- SRMMU_INVAL_MOD = 14,
-};
-
-extern enum mbus_module srmmu_modtype;
-extern unsigned int viking_rev, swift_rev, cypress_rev;
-
-/* HW Mbus module bugs we have to deal with */
-#define HWBUG_COPYBACK_BROKEN 0x00000001
-#define HWBUG_ASIFLUSH_BROKEN 0x00000002
-#define HWBUG_VACFLUSH_BITROT 0x00000004
-#define HWBUG_KERN_ACCBROKEN 0x00000008
-#define HWBUG_KERN_CBITBROKEN 0x00000010
-#define HWBUG_MODIFIED_BITROT 0x00000020
-#define HWBUG_PC_BADFAULT_ADDR 0x00000040
-#define HWBUG_SUPERSCALAR_BAD 0x00000080
-#define HWBUG_PACINIT_BITROT 0x00000100
-
-/* First the module type values. To find out which you have, just load
- * the mmu control register from ASI_M_MMUREG alternate address space and
- * shift the value right 28 bits.
- */
-/* IMPL field means the company which produced the chip. */
-#define MBUS_VIKING 0x4 /* bleech, Texas Instruments Module */
-#define MBUS_LSI 0x3 /* LSI Logics */
-#define MBUS_ROSS 0x1 /* Ross is nice */
-#define MBUS_FMI 0x0 /* Fujitsu Microelectronics/Swift */
-
-/* Ross Module versions */
-#define ROSS_604_REV_CDE 0x0 /* revisions c, d, and e */
-#define ROSS_604_REV_F 0x1 /* revision f */
-#define ROSS_605 0xf /* revision a, a.1, and a.2 */
-#define ROSS_605_REV_B 0xe /* revision b */
-
-/* TI Viking Module versions */
-#define VIKING_REV_12 0x1 /* Version 1.2 or SPARCclassic's CPU */
-#define VIKING_REV_2 0x2 /* Version 2.1, 2.2, 2.3, and 2.4 */
-#define VIKING_REV_30 0x3 /* Version 3.0 */
-#define VIKING_REV_35 0x4 /* Version 3.5 */
-
-/* LSI Logics. */
-#define LSI_L64815 0x0
-
-/* Fujitsu */
-#define FMI_AURORA 0x4 /* MB8690x, a Swift module... */
-#define FMI_TURBO 0x5 /* MB86907, a TurboSparc module... */
-
-/* For multiprocessor support we need to be able to obtain the CPU id and
- * the MBUS Module id.
- */
-
-/* The CPU ID is encoded in the trap base register, 20 bits to the left of
- * bit zero, with 2 bits being significant.
- */
-#define TBR_ID_SHIFT 20
-
-static inline int get_cpuid(void)
-{
- register int retval;
- __asm__ __volatile__("rd %%tbr, %0\n\t"
- "srl %0, %1, %0\n\t" :
- "=r" (retval) :
- "i" (TBR_ID_SHIFT));
- return (retval & 3);
-}
-
-static inline int get_modid(void)
-{
- return (get_cpuid() | 0x8);
-}
-
-
-#endif /* !(_SPARC_MBUS_H) */
diff --git a/arch/sparc/kernel/cpu.c b/arch/sparc/kernel/cpu.c
index 79cd6ccfeac0..cca7de051593 100644
--- a/arch/sparc/kernel/cpu.c
+++ b/arch/sparc/kernel/cpu.c
@@ -19,7 +19,6 @@
#include <asm/page.h>
#include <asm/head.h>
#include <asm/psr.h>
-#include <asm/mbus.h>
#include <asm/cpudata.h>
#include "kernel.h"
diff --git a/arch/sparc/kernel/setup_32.c b/arch/sparc/kernel/setup_32.c
index 704375c061e7..3c6c16fde8c3 100644
--- a/arch/sparc/kernel/setup_32.c
+++ b/arch/sparc/kernel/setup_32.c
@@ -41,7 +41,6 @@
#include <asm/page.h>
#include <asm/traps.h>
#include <asm/vaddrs.h>
-#include <asm/mbus.h>
#include <asm/idprom.h>
#include <asm/cpudata.h>
#include <asm/setup.h>
diff --git a/arch/sparc/mm/iommu.c b/arch/sparc/mm/iommu.c
index 5a5080db800f..832e5ff8b663 100644
--- a/arch/sparc/mm/iommu.c
+++ b/arch/sparc/mm/iommu.c
@@ -19,7 +19,6 @@
#include <asm/io.h>
#include <asm/mxcc.h>
-#include <asm/mbus.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include <asm/bitext.h>
@@ -117,13 +116,7 @@ static void __init sbus_iommu_init(struct platform_device *op)
prom_halt();
}
bit_map_init(&iommu->usemap, bitmap, IOMMU_NPTES);
- /* To be coherent on HyperSparc, the page color of DVMA
- * and physical addresses must match.
- */
- if (srmmu_modtype == HyperSparc)
- iommu->usemap.num_colors = vac_cache_size >> PAGE_SHIFT;
- else
- iommu->usemap.num_colors = 1;
+ iommu->usemap.num_colors = 1;
printk(KERN_INFO "IOMMU: impl %d vers %d table 0x%p[%d B] map [%d b]\n",
impl, vers, iommu->page_table,
@@ -445,11 +438,6 @@ static const struct dma_map_ops sbus_iommu_dma_pflush_ops = {
void __init ld_mmu_iommu(void)
{
- if (viking_mxcc_present || srmmu_modtype == HyperSparc) {
- dvma_prot = __pgprot(SRMMU_CACHE | SRMMU_ET_PTE | SRMMU_PRIV);
- ioperm_noc = IOPTE_CACHE | IOPTE_WRITE | IOPTE_VALID;
- } else {
- dvma_prot = __pgprot(SRMMU_ET_PTE | SRMMU_PRIV);
- ioperm_noc = IOPTE_WRITE | IOPTE_VALID;
- }
+ dvma_prot = __pgprot(SRMMU_CACHE | SRMMU_ET_PTE | SRMMU_PRIV);
+ ioperm_noc = IOPTE_CACHE | IOPTE_WRITE | IOPTE_VALID;
}
diff --git a/arch/sparc/mm/srmmu.c b/arch/sparc/mm/srmmu.c
index 04d9653890c5..3a7e10729a02 100644
--- a/arch/sparc/mm/srmmu.c
+++ b/arch/sparc/mm/srmmu.c
@@ -34,7 +34,6 @@
#include <asm/cache.h>
#include <asm/traps.h>
#include <asm/oplib.h>
-#include <asm/mbus.h>
#include <asm/page.h>
#include <asm/asi.h>
#include <asm/smp.h>
@@ -51,8 +50,6 @@
#include "mm_32.h"
-enum mbus_module srmmu_modtype;
-static unsigned int hwbug_bitmask;
int vac_cache_size;
EXPORT_SYMBOL(vac_cache_size);
int vac_line_size;
@@ -1117,7 +1114,6 @@ static const struct sparc32_cachetlb_ops hypersparc_ops = {
static void __init init_hypersparc(void)
{
srmmu_name = "ROSS HyperSparc";
- srmmu_modtype = HyperSparc;
init_vac_layout();
@@ -1176,45 +1172,6 @@ static void __init init_swift(void)
"=r" (swift_rev) :
"r" (SWIFT_MASKID_ADDR), "i" (ASI_M_BYPASS));
srmmu_name = "Fujitsu Swift";
- switch (swift_rev) {
- case 0x11:
- case 0x20:
- case 0x23:
- case 0x30:
- srmmu_modtype = Swift_lots_o_bugs;
- hwbug_bitmask |= (HWBUG_KERN_ACCBROKEN | HWBUG_KERN_CBITBROKEN);
- /*
- * Gee george, I wonder why Sun is so hush hush about
- * this hardware bug... really braindamage stuff going
- * on here. However I think we can find a way to avoid
- * all of the workaround overhead under Linux. Basically,
- * any page fault can cause kernel pages to become user
- * accessible (the mmu gets confused and clears some of
- * the ACC bits in kernel ptes). Aha, sounds pretty
- * horrible eh? But wait, after extensive testing it appears
- * that if you use pgd_t level large kernel pte's (like the
- * 4MB pages on the Pentium) the bug does not get tripped
- * at all. This avoids almost all of the major overhead.
- * Welcome to a world where your vendor tells you to,
- * "apply this kernel patch" instead of "sorry for the
- * broken hardware, send it back and we'll give you
- * properly functioning parts"
- */
- break;
- case 0x25:
- case 0x31:
- srmmu_modtype = Swift_bad_c;
- hwbug_bitmask |= HWBUG_KERN_CBITBROKEN;
- /*
- * You see Sun allude to this hardware bug but never
- * admit things directly, they'll say things like,
- * "the Swift chip cache problems" or similar.
- */
- break;
- default:
- srmmu_modtype = Swift_ok;
- break;
- }
sparc32_cachetlb_ops = &swift_ops;
flush_page_for_dma_global = 0;
@@ -1367,7 +1324,6 @@ static const struct sparc32_cachetlb_ops turbosparc_ops = {
static void __init init_turbosparc(void)
{
srmmu_name = "Fujitsu TurboSparc";
- srmmu_modtype = TurboSparc;
sparc32_cachetlb_ops = &turbosparc_ops;
poke_srmmu = poke_turbosparc;
}
@@ -1406,7 +1362,6 @@ static void __init init_tsunami(void)
*/
srmmu_name = "TI Tsunami";
- srmmu_modtype = Tsunami;
sparc32_cachetlb_ops = &tsunami_ops;
poke_srmmu = poke_tsunami;
@@ -1546,9 +1501,6 @@ static void __init get_srmmu_type(void)
unsigned long mreg, psr;
unsigned long mod_typ, mod_rev, psr_typ, psr_vers;
- srmmu_modtype = SRMMU_INVAL_MOD;
- hwbug_bitmask = 0;
-
mreg = srmmu_get_mmureg(); psr = get_psr();
mod_typ = (mreg & 0xf0000000) >> 28;
mod_rev = (mreg & 0x0f000000) >> 24;
--
2.34.1
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