| 1 | |
| 2 | * Support for MicroBlaze PVR (processor version register)
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| 3 | *
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| 4 | * Copyright (C) 2007-2009 Michal Simek <[email protected]>
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| 5 | * Copyright (C) 2007-2009 PetaLogix
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| 6 | * Copyright (C) 2007 John Williams <[email protected]>
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| 7 | *
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| 8 | * This file is subject to the terms and conditions of the GNU General Public
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| 9 | * License. See the file "COPYING" in the main directory of this archive
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| 10 | * for more details.
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| 11 |
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| 12 |
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| 13 | #include <linux/kernel.h>
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| 14 | #include <linux/compiler.h>
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| 15 | #include <asm/exceptions.h>
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| 16 | #include <asm/pvr.h>
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| 17 | #include <linux/irqflags.h>
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| 18 |
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| 19 | |
| 20 | * Until we get an assembler that knows about the pvr registers,
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| 21 | * this horrible cruft will have to do.
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| 22 | * That hardcoded opcode is mfs r3, rpvrNN
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| 23 |
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| 24 |
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| 25 | #define get_single_pvr(pvrid, val) \
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| 26 | { \
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| 27 | register unsigned tmp __asm__("r3"); \
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| 28 | tmp = 0x0; \
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| 29 | __asm__ __volatile__ ( \
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| 30 | "mfs %0, rpvr" #pvrid ";" \
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| 31 | : "=r" (tmp) : : "memory"); \
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| 32 | val = tmp; \
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| 33 | }
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| 34 |
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| 35 | |
| 36 | * Does the CPU support the PVR register?
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| 37 | * return value:
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| 38 | * 0: no PVR
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| 39 | * 1: simple PVR
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| 40 | * 2: full PVR
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| 41 | *
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| 42 | * This must work on all CPU versions, including those before the
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| 43 | * PVR was even an option.
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| 44 |
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| 45 |
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| 46 | int cpu_has_pvr(void)
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| 47 | {
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| 48 | unsigned long flags;
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| 49 | unsigned pvr0;
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| 50 |
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| 51 | local_save_flags(flags);
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| 52 |
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| 53 |
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| 54 | if (!(flags & PVR_MSR_BIT))
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| 55 | return 0;
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| 56 |
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| 57 | get_single_pvr(0, pvr0);
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| 58 | pr_debug("%s: pvr0 is 0x%08x\n", __func__, pvr0);
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| 59 |
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| 60 | if (pvr0 & PVR0_PVR_FULL_MASK)
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| 61 | return 1;
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| 62 |
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| 63 |
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| 64 | return 2;
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| 65 | }
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| 66 |
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| 67 | void get_pvr(struct pvr_s *p)
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| 68 | {
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| 69 | get_single_pvr(0, p->pvr[0]);
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| 70 | get_single_pvr(1, p->pvr[1]);
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| 71 | get_single_pvr(2, p->pvr[2]);
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| 72 | get_single_pvr(3, p->pvr[3]);
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| 73 | get_single_pvr(4, p->pvr[4]);
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| 74 | get_single_pvr(5, p->pvr[5]);
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| 75 | get_single_pvr(6, p->pvr[6]);
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| 76 | get_single_pvr(7, p->pvr[7]);
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| 77 | get_single_pvr(8, p->pvr[8]);
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| 78 | get_single_pvr(9, p->pvr[9]);
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| 79 | get_single_pvr(10, p->pvr[10]);
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| 80 | get_single_pvr(11, p->pvr[11]);
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| 81 | }
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