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