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 #include <linux/irqflags.h> 18 19 /* 20 * Until we get an assembler that knows about the pvr registers, 21 * this horrible cruft will have to do. 22 * That hardcoded opcode is mfs r3, rpvrNN 23 */ 24 25 #define get_single_pvr(pvrid, val) \ 26 { \ 27 register unsigned tmp __asm__("r3"); \ 28 tmp = 0x0; /* Prevent warning about unused */ \ 29 __asm__ __volatile__ ( \ 30 "mfs %0, rpvr" #pvrid ";" \ 31 : "=r" (tmp) : : "memory"); \ 32 val = tmp; \ 33 } 34 35 /* 36 * Does the CPU support the PVR register? 37 * return value: 38 * 0: no PVR 39 * 1: simple PVR 40 * 2: full PVR 41 * 42 * This must work on all CPU versions, including those before the 43 * PVR was even an option. 44 */ 45 46 int cpu_has_pvr(void) 47 { 48 unsigned long flags; 49 unsigned pvr0; 50 51 local_save_flags(flags); 52 53 /* PVR bit in MSR tells us if there is any support */ 54 if (!(flags & PVR_MSR_BIT)) 55 return 0; 56 57 get_single_pvr(0, pvr0); 58 pr_debug("%s: pvr0 is 0x%08x\n", __func__, pvr0); 59 60 if (pvr0 & PVR0_PVR_FULL_MASK) 61 return 1; 62 63 /* for partial PVR use static cpuinfo */ 64 return 2; 65 } 66 67 void get_pvr(struct pvr_s *p) 68 { 69 get_single_pvr(0, p->pvr[0]); 70 get_single_pvr(1, p->pvr[1]); 71 get_single_pvr(2, p->pvr[2]); 72 get_single_pvr(3, p->pvr[3]); 73 get_single_pvr(4, p->pvr[4]); 74 get_single_pvr(5, p->pvr[5]); 75 get_single_pvr(6, p->pvr[6]); 76 get_single_pvr(7, p->pvr[7]); 77 get_single_pvr(8, p->pvr[8]); 78 get_single_pvr(9, p->pvr[9]); 79 get_single_pvr(10, p->pvr[10]); 80 get_single_pvr(11, p->pvr[11]); 81 } 82