1 /* 2 * (C) Copyright 2000-2002 3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 /* 9 * m8xx.c 10 * 11 * CPU specific code 12 * 13 * written or collected and sometimes rewritten by 14 * Magnus Damm <damm@bitsmart.com> 15 * 16 * minor modifications by 17 * Wolfgang Denk <wd@denx.de> 18 */ 19 20 #include <common.h> 21 #include <watchdog.h> 22 #include <command.h> 23 #include <mpc8xx.h> 24 #include <netdev.h> 25 #include <asm/cache.h> 26 #include <asm/cpm_8xx.h> 27 #include <linux/compiler.h> 28 #include <asm/io.h> 29 30 #if defined(CONFIG_OF_LIBFDT) 31 #include <linux/libfdt.h> 32 #include <fdt_support.h> 33 #endif 34 35 DECLARE_GLOBAL_DATA_PTR; 36 37 static int check_CPU(long clock, uint pvr, uint immr) 38 { 39 immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR; 40 uint k; 41 char buf[32]; 42 43 /* the highest 16 bits should be 0x0050 for a 860 */ 44 45 if (PVR_VER(pvr) != PVR_VER(PVR_8xx)) 46 return -1; 47 48 k = (immr << 16) | 49 in_be16(&immap->im_cpm.cp_dparam16[PROFF_REVNUM / sizeof(u16)]); 50 51 /* 52 * Some boards use sockets so different CPUs can be used. 53 * We have to check chip version in run time. 54 */ 55 switch (k) { 56 /* MPC866P/MPC866T/MPC859T/MPC859DSL/MPC852T */ 57 case 0x08010004: /* Rev. A.0 */ 58 printf("MPC866xxxZPnnA"); 59 break; 60 case 0x08000003: /* Rev. 0.3 */ 61 printf("MPC866xxxZPnn"); 62 break; 63 case 0x09000000: /* 870/875/880/885 */ 64 puts("MPC885ZPnn"); 65 break; 66 67 default: 68 printf("unknown MPC86x (0x%08x)", k); 69 break; 70 } 71 72 printf(" at %s MHz: ", strmhz(buf, clock)); 73 74 print_size(checkicache(), " I-Cache "); 75 print_size(checkdcache(), " D-Cache"); 76 77 /* do we have a FEC (860T/P or 852/859/866/885)? */ 78 79 out_be32(&immap->im_cpm.cp_fec.fec_addr_low, 0x12345678); 80 if (in_be32(&immap->im_cpm.cp_fec.fec_addr_low) == 0x12345678) 81 printf(" FEC present"); 82 83 putc('\n'); 84 85 return 0; 86 } 87 88 /* ------------------------------------------------------------------------- */ 89 90 int checkcpu(void) 91 { 92 ulong clock = gd->cpu_clk; 93 uint immr = get_immr(); /* Return full IMMR contents */ 94 uint pvr = get_pvr(); 95 96 puts("CPU: "); 97 98 return check_CPU(clock, pvr, immr); 99 } 100 101 /* ------------------------------------------------------------------------- */ 102 /* L1 i-cache */ 103 104 int checkicache(void) 105 { 106 immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR; 107 memctl8xx_t __iomem *memctl = &immap->im_memctl; 108 u32 cacheon = rd_ic_cst() & IDC_ENABLED; 109 /* probe in flash memoryarea */ 110 u32 k = in_be32(&memctl->memc_br0) & ~0x00007fff; 111 u32 m; 112 u32 lines = -1; 113 114 wr_ic_cst(IDC_UNALL); 115 wr_ic_cst(IDC_INVALL); 116 wr_ic_cst(IDC_DISABLE); 117 __asm__ volatile ("isync"); 118 119 while (!((m = rd_ic_cst()) & IDC_CERR2)) { 120 wr_ic_adr(k); 121 wr_ic_cst(IDC_LDLCK); 122 __asm__ volatile ("isync"); 123 124 lines++; 125 k += 0x10; /* the number of bytes in a cacheline */ 126 } 127 128 wr_ic_cst(IDC_UNALL); 129 wr_ic_cst(IDC_INVALL); 130 131 if (cacheon) 132 wr_ic_cst(IDC_ENABLE); 133 else 134 wr_ic_cst(IDC_DISABLE); 135 136 __asm__ volatile ("isync"); 137 138 return lines << 4; 139 }; 140 141 /* ------------------------------------------------------------------------- */ 142 /* L1 d-cache */ 143 /* call with cache disabled */ 144 145 int checkdcache(void) 146 { 147 immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR; 148 memctl8xx_t __iomem *memctl = &immap->im_memctl; 149 u32 cacheon = rd_dc_cst() & IDC_ENABLED; 150 /* probe in flash memoryarea */ 151 u32 k = in_be32(&memctl->memc_br0) & ~0x00007fff; 152 u32 m; 153 u32 lines = -1; 154 155 wr_dc_cst(IDC_UNALL); 156 wr_dc_cst(IDC_INVALL); 157 wr_dc_cst(IDC_DISABLE); 158 159 while (!((m = rd_dc_cst()) & IDC_CERR2)) { 160 wr_dc_adr(k); 161 wr_dc_cst(IDC_LDLCK); 162 lines++; 163 k += 0x10; /* the number of bytes in a cacheline */ 164 } 165 166 wr_dc_cst(IDC_UNALL); 167 wr_dc_cst(IDC_INVALL); 168 169 if (cacheon) 170 wr_dc_cst(IDC_ENABLE); 171 else 172 wr_dc_cst(IDC_DISABLE); 173 174 return lines << 4; 175 }; 176 177 /* ------------------------------------------------------------------------- */ 178 179 void upmconfig(uint upm, uint *table, uint size) 180 { 181 uint i; 182 uint addr = 0; 183 immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR; 184 memctl8xx_t __iomem *memctl = &immap->im_memctl; 185 186 for (i = 0; i < size; i++) { 187 out_be32(&memctl->memc_mdr, table[i]); /* (16-15) */ 188 out_be32(&memctl->memc_mcr, addr | upm); /* (16-16) */ 189 addr++; 190 } 191 } 192 193 /* ------------------------------------------------------------------------- */ 194 195 int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 196 { 197 ulong msr, addr; 198 199 immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR; 200 201 /* Checkstop Reset enable */ 202 setbits_be32(&immap->im_clkrst.car_plprcr, PLPRCR_CSR); 203 204 /* Interrupts and MMU off */ 205 __asm__ volatile ("mtspr 81, 0"); 206 __asm__ volatile ("mfmsr %0" : "=r" (msr)); 207 208 msr &= ~0x1030; 209 __asm__ volatile ("mtmsr %0" : : "r" (msr)); 210 211 /* 212 * Trying to execute the next instruction at a non-existing address 213 * should cause a machine check, resulting in reset 214 */ 215 #ifdef CONFIG_SYS_RESET_ADDRESS 216 addr = CONFIG_SYS_RESET_ADDRESS; 217 #else 218 /* 219 * note: when CONFIG_SYS_MONITOR_BASE points to a RAM address, 220 * CONFIG_SYS_MONITOR_BASE - sizeof (ulong) is usually a valid address. 221 * Better pick an address known to be invalid on your system and assign 222 * it to CONFIG_SYS_RESET_ADDRESS. 223 * "(ulong)-1" used to be a good choice for many systems... 224 */ 225 addr = CONFIG_SYS_MONITOR_BASE - sizeof(ulong); 226 #endif 227 ((void (*)(void)) addr)(); 228 return 1; 229 } 230 231 /* ------------------------------------------------------------------------- */ 232 233 /* 234 * Get timebase clock frequency (like cpu_clk in Hz) 235 * 236 * See sections 14.2 and 14.6 of the User's Manual 237 */ 238 unsigned long get_tbclk(void) 239 { 240 immap_t __iomem *immap = (immap_t __iomem *)CONFIG_SYS_IMMR; 241 ulong oscclk, factor, pll; 242 243 if (in_be32(&immap->im_clkrst.car_sccr) & SCCR_TBS) 244 return gd->cpu_clk / 16; 245 246 pll = in_be32(&immap->im_clkrst.car_plprcr); 247 248 #define PLPRCR_val(a) ((pll & PLPRCR_ ## a ## _MSK) >> PLPRCR_ ## a ## _SHIFT) 249 250 /* 251 * For newer PQ1 chips (MPC866/87x/88x families), PLL multiplication 252 * factor is calculated as follows: 253 * 254 * MFN 255 * MFI + ------- 256 * MFD + 1 257 * factor = ----------------- 258 * (PDF + 1) * 2^S 259 * 260 */ 261 factor = (PLPRCR_val(MFI) + PLPRCR_val(MFN) / (PLPRCR_val(MFD) + 1)) / 262 (PLPRCR_val(PDF) + 1) / (1 << PLPRCR_val(S)); 263 264 oscclk = gd->cpu_clk / factor; 265 266 if ((in_be32(&immap->im_clkrst.car_sccr) & SCCR_RTSEL) == 0 || 267 factor > 2) 268 return oscclk / 4; 269 270 return oscclk / 16; 271 } 272 273 /* 274 * Initializes on-chip ethernet controllers. 275 * to override, implement board_eth_init() 276 */ 277 int cpu_eth_init(bd_t *bis) 278 { 279 #if defined(CONFIG_MPC8XX_FEC) 280 fec_initialize(bis); 281 #endif 282 return 0; 283 } 284