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Diffstat (limited to 'arch/i386/kernel/cpu/cyrix.c')
-rw-r--r--arch/i386/kernel/cpu/cyrix.c463
1 files changed, 0 insertions, 463 deletions
diff --git a/arch/i386/kernel/cpu/cyrix.c b/arch/i386/kernel/cpu/cyrix.c
deleted file mode 100644
index 122d2d75aa9..00000000000
--- a/arch/i386/kernel/cpu/cyrix.c
+++ /dev/null
@@ -1,463 +0,0 @@
-#include <linux/init.h>
-#include <linux/bitops.h>
-#include <linux/delay.h>
-#include <linux/pci.h>
-#include <asm/dma.h>
-#include <asm/io.h>
-#include <asm/processor-cyrix.h>
-#include <asm/timer.h>
-#include <asm/pci-direct.h>
-#include <asm/tsc.h>
-
-#include "cpu.h"
-
-/*
- * Read NSC/Cyrix DEVID registers (DIR) to get more detailed info. about the CPU
- */
-static void __cpuinit do_cyrix_devid(unsigned char *dir0, unsigned char *dir1)
-{
- unsigned char ccr2, ccr3;
- unsigned long flags;
-
- /* we test for DEVID by checking whether CCR3 is writable */
- local_irq_save(flags);
- ccr3 = getCx86(CX86_CCR3);
- setCx86(CX86_CCR3, ccr3 ^ 0x80);
- getCx86(0xc0); /* dummy to change bus */
-
- if (getCx86(CX86_CCR3) == ccr3) { /* no DEVID regs. */
- ccr2 = getCx86(CX86_CCR2);
- setCx86(CX86_CCR2, ccr2 ^ 0x04);
- getCx86(0xc0); /* dummy */
-
- if (getCx86(CX86_CCR2) == ccr2) /* old Cx486SLC/DLC */
- *dir0 = 0xfd;
- else { /* Cx486S A step */
- setCx86(CX86_CCR2, ccr2);
- *dir0 = 0xfe;
- }
- }
- else {
- setCx86(CX86_CCR3, ccr3); /* restore CCR3 */
-
- /* read DIR0 and DIR1 CPU registers */
- *dir0 = getCx86(CX86_DIR0);
- *dir1 = getCx86(CX86_DIR1);
- }
- local_irq_restore(flags);
-}
-
-/*
- * Cx86_dir0_msb is a HACK needed by check_cx686_cpuid/slop in bugs.h in
- * order to identify the Cyrix CPU model after we're out of setup.c
- *
- * Actually since bugs.h doesn't even reference this perhaps someone should
- * fix the documentation ???
- */
-static unsigned char Cx86_dir0_msb __cpuinitdata = 0;
-
-static char Cx86_model[][9] __cpuinitdata = {
- "Cx486", "Cx486", "5x86 ", "6x86", "MediaGX ", "6x86MX ",
- "M II ", "Unknown"
-};
-static char Cx486_name[][5] __cpuinitdata = {
- "SLC", "DLC", "SLC2", "DLC2", "SRx", "DRx",
- "SRx2", "DRx2"
-};
-static char Cx486S_name[][4] __cpuinitdata = {
- "S", "S2", "Se", "S2e"
-};
-static char Cx486D_name[][4] __cpuinitdata = {
- "DX", "DX2", "?", "?", "?", "DX4"
-};
-static char Cx86_cb[] __cpuinitdata = "?.5x Core/Bus Clock";
-static char cyrix_model_mult1[] __cpuinitdata = "12??43";
-static char cyrix_model_mult2[] __cpuinitdata = "12233445";
-
-/*
- * Reset the slow-loop (SLOP) bit on the 686(L) which is set by some old
- * BIOSes for compatibility with DOS games. This makes the udelay loop
- * work correctly, and improves performance.
- *
- * FIXME: our newer udelay uses the tsc. We don't need to frob with SLOP
- */
-
-extern void calibrate_delay(void) __init;
-
-static void __cpuinit check_cx686_slop(struct cpuinfo_x86 *c)
-{
- unsigned long flags;
-
- if (Cx86_dir0_msb == 3) {
- unsigned char ccr3, ccr5;
-
- local_irq_save(flags);
- ccr3 = getCx86(CX86_CCR3);
- setCx86(CX86_CCR3, (ccr3 & 0x0f) | 0x10); /* enable MAPEN */
- ccr5 = getCx86(CX86_CCR5);
- if (ccr5 & 2)
- setCx86(CX86_CCR5, ccr5 & 0xfd); /* reset SLOP */
- setCx86(CX86_CCR3, ccr3); /* disable MAPEN */
- local_irq_restore(flags);
-
- if (ccr5 & 2) { /* possible wrong calibration done */
- printk(KERN_INFO "Recalibrating delay loop with SLOP bit reset\n");
- calibrate_delay();
- c->loops_per_jiffy = loops_per_jiffy;
- }
- }
-}
-
-
-static void __cpuinit set_cx86_reorder(void)
-{
- u8 ccr3;
-
- printk(KERN_INFO "Enable Memory access reorder on Cyrix/NSC processor.\n");
- ccr3 = getCx86(CX86_CCR3);
- setCx86(CX86_CCR3, (ccr3 & 0x0f) | 0x10); /* enable MAPEN  */
-
- /* Load/Store Serialize to mem access disable (=reorder it)  */
- setCx86(CX86_PCR0, getCx86(CX86_PCR0) & ~0x80);
- /* set load/store serialize from 1GB to 4GB */
- ccr3 |= 0xe0;
- setCx86(CX86_CCR3, ccr3);
-}
-
-static void __cpuinit set_cx86_memwb(void)
-{
- u32 cr0;
-
- printk(KERN_INFO "Enable Memory-Write-back mode on Cyrix/NSC processor.\n");
-
- /* CCR2 bit 2: unlock NW bit */
- setCx86(CX86_CCR2, getCx86(CX86_CCR2) & ~0x04);
- /* set 'Not Write-through' */
- cr0 = 0x20000000;
- write_cr0(read_cr0() | cr0);
- /* CCR2 bit 2: lock NW bit and set WT1 */
- setCx86(CX86_CCR2, getCx86(CX86_CCR2) | 0x14 );
-}
-
-static void __cpuinit set_cx86_inc(void)
-{
- unsigned char ccr3;
-
- printk(KERN_INFO "Enable Incrementor on Cyrix/NSC processor.\n");
-
- ccr3 = getCx86(CX86_CCR3);
- setCx86(CX86_CCR3, (ccr3 & 0x0f) | 0x10); /* enable MAPEN  */
- /* PCR1 -- Performance Control */
- /* Incrementor on, whatever that is */
- setCx86(CX86_PCR1, getCx86(CX86_PCR1) | 0x02);
- /* PCR0 -- Performance Control */
- /* Incrementor Margin 10 */
- setCx86(CX86_PCR0, getCx86(CX86_PCR0) | 0x04);
- setCx86(CX86_CCR3, ccr3); /* disable MAPEN */
-}
-
-/*
- * Configure later MediaGX and/or Geode processor.
- */
-
-static void __cpuinit geode_configure(void)
-{
- unsigned long flags;
- u8 ccr3;
- local_irq_save(flags);
-
- /* Suspend on halt power saving and enable #SUSP pin */
- setCx86(CX86_CCR2, getCx86(CX86_CCR2) | 0x88);
-
- ccr3 = getCx86(CX86_CCR3);
- setCx86(CX86_CCR3, (ccr3 & 0x0f) | 0x10); /* enable MAPEN */
-
-
- /* FPU fast, DTE cache, Mem bypass */
- setCx86(CX86_CCR4, getCx86(CX86_CCR4) | 0x38);
- setCx86(CX86_CCR3, ccr3); /* disable MAPEN */
-
- set_cx86_memwb();
- set_cx86_reorder();
- set_cx86_inc();
-
- local_irq_restore(flags);
-}
-
-
-static void __cpuinit init_cyrix(struct cpuinfo_x86 *c)
-{
- unsigned char dir0, dir0_msn, dir0_lsn, dir1 = 0;
- char *buf = c->x86_model_id;
- const char *p = NULL;
-
- /* Bit 31 in normal CPUID used for nonstandard 3DNow ID;
- 3DNow is IDd by bit 31 in extended CPUID (1*32+31) anyway */
- clear_bit(0*32+31, c->x86_capability);
-
- /* Cyrix used bit 24 in extended (AMD) CPUID for Cyrix MMX extensions */
- if ( test_bit(1*32+24, c->x86_capability) ) {
- clear_bit(1*32+24, c->x86_capability);
- set_bit(X86_FEATURE_CXMMX, c->x86_capability);
- }
-
- do_cyrix_devid(&dir0, &dir1);
-
- check_cx686_slop(c);
-
- Cx86_dir0_msb = dir0_msn = dir0 >> 4; /* identifies CPU "family" */
- dir0_lsn = dir0 & 0xf; /* model or clock multiplier */
-
- /* common case step number/rev -- exceptions handled below */
- c->x86_model = (dir1 >> 4) + 1;
- c->x86_mask = dir1 & 0xf;
-
- /* Now cook; the original recipe is by Channing Corn, from Cyrix.
- * We do the same thing for each generation: we work out
- * the model, multiplier and stepping. Black magic included,
- * to make the silicon step/rev numbers match the printed ones.
- */
-
- switch (dir0_msn) {
- unsigned char tmp;
-
- case 0: /* Cx486SLC/DLC/SRx/DRx */
- p = Cx486_name[dir0_lsn & 7];
- break;
-
- case 1: /* Cx486S/DX/DX2/DX4 */
- p = (dir0_lsn & 8) ? Cx486D_name[dir0_lsn & 5]
- : Cx486S_name[dir0_lsn & 3];
- break;
-
- case 2: /* 5x86 */
- Cx86_cb[2] = cyrix_model_mult1[dir0_lsn & 5];
- p = Cx86_cb+2;
- break;
-
- case 3: /* 6x86/6x86L */
- Cx86_cb[1] = ' ';
- Cx86_cb[2] = cyrix_model_mult1[dir0_lsn & 5];
- if (dir1 > 0x21) { /* 686L */
- Cx86_cb[0] = 'L';
- p = Cx86_cb;
- (c->x86_model)++;
- } else /* 686 */
- p = Cx86_cb+1;
- /* Emulate MTRRs using Cyrix's ARRs. */
- set_bit(X86_FEATURE_CYRIX_ARR, c->x86_capability);
- /* 6x86's contain this bug */
- c->coma_bug = 1;
- break;
-
- case 4: /* MediaGX/GXm or Geode GXM/GXLV/GX1 */
-#ifdef CONFIG_PCI
- {
- u32 vendor, device;
- /* It isn't really a PCI quirk directly, but the cure is the
- same. The MediaGX has deep magic SMM stuff that handles the
- SB emulation. It thows away the fifo on disable_dma() which
- is wrong and ruins the audio.
-
- Bug2: VSA1 has a wrap bug so that using maximum sized DMA
- causes bad things. According to NatSemi VSA2 has another
- bug to do with 'hlt'. I've not seen any boards using VSA2
- and X doesn't seem to support it either so who cares 8).
- VSA1 we work around however.
- */
-
- printk(KERN_INFO "Working around Cyrix MediaGX virtual DMA bugs.\n");
- isa_dma_bridge_buggy = 2;
-
- /* We do this before the PCI layer is running. However we
- are safe here as we know the bridge must be a Cyrix
- companion and must be present */
- vendor = read_pci_config_16(0, 0, 0x12, PCI_VENDOR_ID);
- device = read_pci_config_16(0, 0, 0x12, PCI_DEVICE_ID);
-
- /*
- * The 5510/5520 companion chips have a funky PIT.
- */
- if (vendor == PCI_VENDOR_ID_CYRIX &&
- (device == PCI_DEVICE_ID_CYRIX_5510 || device == PCI_DEVICE_ID_CYRIX_5520))
- mark_tsc_unstable("cyrix 5510/5520 detected");
- }
-#endif
- c->x86_cache_size=16; /* Yep 16K integrated cache thats it */
-
- /* GXm supports extended cpuid levels 'ala' AMD */
- if (c->cpuid_level == 2) {
- /* Enable cxMMX extensions (GX1 Datasheet 54) */
- setCx86(CX86_CCR7, getCx86(CX86_CCR7) | 1);
-
- /*
- * GXm : 0x30 ... 0x5f GXm datasheet 51
- * GXlv: 0x6x GXlv datasheet 54
- * ? : 0x7x
- * GX1 : 0x8x GX1 datasheet 56
- */
- if((0x30 <= dir1 && dir1 <= 0x6f) || (0x80 <=dir1 && dir1 <= 0x8f))
- geode_configure();
- get_model_name(c); /* get CPU marketing name */
- return;
- }
- else { /* MediaGX */
- Cx86_cb[2] = (dir0_lsn & 1) ? '3' : '4';
- p = Cx86_cb+2;
- c->x86_model = (dir1 & 0x20) ? 1 : 2;
- }
- break;
-
- case 5: /* 6x86MX/M II */
- if (dir1 > 7)
- {
- dir0_msn++; /* M II */
- /* Enable MMX extensions (App note 108) */
- setCx86(CX86_CCR7, getCx86(CX86_CCR7)|1);
- }
- else
- {
- c->coma_bug = 1; /* 6x86MX, it has the bug. */
- }
- tmp = (!(dir0_lsn & 7) || dir0_lsn & 1) ? 2 : 0;
- Cx86_cb[tmp] = cyrix_model_mult2[dir0_lsn & 7];
- p = Cx86_cb+tmp;
- if (((dir1 & 0x0f) > 4) || ((dir1 & 0xf0) == 0x20))
- (c->x86_model)++;
- /* Emulate MTRRs using Cyrix's ARRs. */
- set_bit(X86_FEATURE_CYRIX_ARR, c->x86_capability);
- break;
-
- case 0xf: /* Cyrix 486 without DEVID registers */
- switch (dir0_lsn) {
- case 0xd: /* either a 486SLC or DLC w/o DEVID */
- dir0_msn = 0;
- p = Cx486_name[(c->hard_math) ? 1 : 0];
- break;
-
- case 0xe: /* a 486S A step */
- dir0_msn = 0;
- p = Cx486S_name[0];
- break;
- }
- break;
-
- default: /* unknown (shouldn't happen, we know everyone ;-) */
- dir0_msn = 7;
- break;
- }
- strcpy(buf, Cx86_model[dir0_msn & 7]);
- if (p) strcat(buf, p);
- return;
-}
-
-/*
- * Handle National Semiconductor branded processors
- */
-static void __cpuinit init_nsc(struct cpuinfo_x86 *c)
-{
- /* There may be GX1 processors in the wild that are branded
- * NSC and not Cyrix.
- *
- * This function only handles the GX processor, and kicks every
- * thing else to the Cyrix init function above - that should
- * cover any processors that might have been branded differently
- * after NSC acquired Cyrix.
- *
- * If this breaks your GX1 horribly, please e-mail
- * info-linux@ldcmail.amd.com to tell us.
- */
-
- /* Handle the GX (Formally known as the GX2) */
-
- if (c->x86 == 5 && c->x86_model == 5)
- display_cacheinfo(c);
- else
- init_cyrix(c);
-}
-
-/*
- * Cyrix CPUs without cpuid or with cpuid not yet enabled can be detected
- * by the fact that they preserve the flags across the division of 5/2.
- * PII and PPro exhibit this behavior too, but they have cpuid available.
- */
-
-/*
- * Perform the Cyrix 5/2 test. A Cyrix won't change
- * the flags, while other 486 chips will.
- */
-static inline int test_cyrix_52div(void)
-{
- unsigned int test;
-
- __asm__ __volatile__(
- "sahf\n\t" /* clear flags (%eax = 0x0005) */
- "div %b2\n\t" /* divide 5 by 2 */
- "lahf" /* store flags into %ah */
- : "=a" (test)
- : "0" (5), "q" (2)
- : "cc");
-
- /* AH is 0x02 on Cyrix after the divide.. */
- return (unsigned char) (test >> 8) == 0x02;
-}
-
-static void __cpuinit cyrix_identify(struct cpuinfo_x86 * c)
-{
- /* Detect Cyrix with disabled CPUID */
- if ( c->x86 == 4 && test_cyrix_52div() ) {
- unsigned char dir0, dir1;
-
- strcpy(c->x86_vendor_id, "CyrixInstead");
- c->x86_vendor = X86_VENDOR_CYRIX;
-
- /* Actually enable cpuid on the older cyrix */
-
- /* Retrieve CPU revisions */
-
- do_cyrix_devid(&dir0, &dir1);
-
- dir0>>=4;
-
- /* Check it is an affected model */
-
- if (dir0 == 5 || dir0 == 3)
- {
- unsigned char ccr3;
- unsigned long flags;
- printk(KERN_INFO "Enabling CPUID on Cyrix processor.\n");
- local_irq_save(flags);
- ccr3 = getCx86(CX86_CCR3);
- setCx86(CX86_CCR3, (ccr3 & 0x0f) | 0x10); /* enable MAPEN */
- setCx86(CX86_CCR4, getCx86(CX86_CCR4) | 0x80); /* enable cpuid */
- setCx86(CX86_CCR3, ccr3); /* disable MAPEN */
- local_irq_restore(flags);
- }
- }
-}
-
-static struct cpu_dev cyrix_cpu_dev __cpuinitdata = {
- .c_vendor = "Cyrix",
- .c_ident = { "CyrixInstead" },
- .c_init = init_cyrix,
- .c_identify = cyrix_identify,
-};
-
-int __init cyrix_init_cpu(void)
-{
- cpu_devs[X86_VENDOR_CYRIX] = &cyrix_cpu_dev;
- return 0;
-}
-
-static struct cpu_dev nsc_cpu_dev __cpuinitdata = {
- .c_vendor = "NSC",
- .c_ident = { "Geode by NSC" },
- .c_init = init_nsc,
-};
-
-int __init nsc_init_cpu(void)
-{
- cpu_devs[X86_VENDOR_NSC] = &nsc_cpu_dev;
- return 0;
-}
-
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