arch/ppc/syslib/ibm440gx_common.c

   1 /*
   2  * PPC440GX system library
   3  *
   4  * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
   5  * Copyright (c) 2003, 2004 Zultys Technologies
   6  *
   7  * This program is free software; you can redistribute  it and/or modify it
   8  * under  the terms of  the GNU General  Public License as published by the
   9  * Free Software Foundation;  either version 2 of the  License, or (at your
  10  * option) any later version.
  11  *
  12  */
  13 #include <linux/config.h>
  14 #include <linux/kernel.h>
  15 #include <linux/interrupt.h>
  16 #include <asm/ibm44x.h>
  17 #include <asm/mmu.h>
  18 #include <asm/processor.h>
  19 #include <syslib/ibm440gx_common.h>
  20
  21 /*
  22  * Calculate 440GX clocks
  23  */
  24 static inline u32 __fix_zero(u32 v, u32 def){
  25         return v ? v : def;
  26 }
  27
  28 void __init ibm440gx_get_clocks(struct ibm44x_clocks* p, unsigned int sys_clk,
  29         unsigned int ser_clk)
  30 {
  31         u32 pllc  = CPR_READ(DCRN_CPR_PLLC);
  32         u32 plld  = CPR_READ(DCRN_CPR_PLLD);
  33         u32 uart0 = SDR_READ(DCRN_SDR_UART0);
  34         u32 uart1 = SDR_READ(DCRN_SDR_UART1);
  35 #ifdef CONFIG_440EP
  36         u32 uart2 = SDR_READ(DCRN_SDR_UART2);
  37         u32 uart3 = SDR_READ(DCRN_SDR_UART3);
  38 #endif
  39
  40         /* Dividers */
  41         u32 fbdv   = __fix_zero((plld >> 24) & 0x1f, 32);
  42         u32 fwdva  = __fix_zero((plld >> 16) & 0xf, 16);
  43         u32 fwdvb  = __fix_zero((plld >> 8) & 7, 8);
  44         u32 lfbdv  = __fix_zero(plld & 0x3f, 64);
  45         u32 pradv0 = __fix_zero((CPR_READ(DCRN_CPR_PRIMAD) >> 24) & 7, 8);
  46         u32 prbdv0 = __fix_zero((CPR_READ(DCRN_CPR_PRIMBD) >> 24) & 7, 8);
  47         u32 opbdv0 = __fix_zero((CPR_READ(DCRN_CPR_OPBD) >> 24) & 3, 4);
  48         u32 perdv0 = __fix_zero((CPR_READ(DCRN_CPR_PERD) >> 24) & 3, 4);
  49
  50         /* Input clocks for primary dividers */
  51         u32 clk_a, clk_b;
  52
  53         if (pllc & 0x40000000){
  54                 u32 m;
  55
  56                 /* Feedback path */
  57                 switch ((pllc >> 24) & 7){
  58                 case 0:
  59                         /* PLLOUTx */
  60                         m = ((pllc & 0x20000000) ? fwdvb : fwdva) * lfbdv;
  61                         break;
  62                 case 1:
  63                         /* CPU */
  64                         m = fwdva * pradv0;
  65                         break;
  66                 case 5:
  67                         /* PERClk */
  68                         m = fwdvb * prbdv0 * opbdv0 * perdv0;
  69                         break;
  70                 default:
  71                         printk(KERN_EMERG "invalid PLL feedback source\n");
  72                         goto bypass;
  73                 }
  74                 m *= fbdv;
  75                 p->vco = sys_clk * m;
  76                 clk_a = p->vco / fwdva;
  77                 clk_b = p->vco / fwdvb;
  78         }
  79         else {
  80 bypass:
  81                 /* Bypass system PLL */
  82                 p->vco = 0;
  83                 clk_a = clk_b = sys_clk;
  84         }
  85
  86         p->cpu = clk_a / pradv0;
  87         p->plb = clk_b / prbdv0;
  88         p->opb = p->plb / opbdv0;
  89         p->ebc = p->opb / perdv0;
  90
  91         /* UARTs clock */
  92         if (uart0 & 0x00800000)
  93                 p->uart0 = ser_clk;
  94         else
  95                 p->uart0 = p->plb / __fix_zero(uart0 & 0xff, 256);
  96
  97         if (uart1 & 0x00800000)
  98                 p->uart1 = ser_clk;
  99         else
 100                 p->uart1 = p->plb / __fix_zero(uart1 & 0xff, 256);
 101 #ifdef CONFIG_440EP
 102         if (uart2 & 0x00800000)
 103                 p->uart2 = ser_clk;
 104         else
 105                 p->uart2 = p->plb / __fix_zero(uart2 & 0xff, 256);
 106
 107         if (uart3 & 0x00800000)
 108                 p->uart3 = ser_clk;
 109         else
 110                 p->uart3 = p->plb / __fix_zero(uart3 & 0xff, 256);
 111 #endif
 112 }
 113
 114 /* Issue L2C diagnostic command */
 115 static inline u32 l2c_diag(u32 addr)
 116 {
 117         mtdcr(DCRN_L2C0_ADDR, addr);
 118         mtdcr(DCRN_L2C0_CMD, L2C_CMD_DIAG);
 119         while (!(mfdcr(DCRN_L2C0_SR) & L2C_SR_CC)) ;
 120         return mfdcr(DCRN_L2C0_DATA);
 121 }
 122
 123 static irqreturn_t l2c_error_handler(int irq, void* dev, struct pt_regs* regs)
 124 {
 125         u32 sr = mfdcr(DCRN_L2C0_SR);
 126         if (sr & L2C_SR_CPE){
 127                 /* Read cache trapped address */
 128                 u32 addr = l2c_diag(0x42000000);
 129                 printk(KERN_EMERG "L2C: Cache Parity Error, addr[16:26] = 0x%08x\n", addr);
 130         }
 131         if (sr & L2C_SR_TPE){
 132                 /* Read tag trapped address */
 133                 u32 addr = l2c_diag(0x82000000) >> 16;
 134                 printk(KERN_EMERG "L2C: Tag Parity Error, addr[16:26] = 0x%08x\n", addr);
 135         }
 136
 137         /* Clear parity errors */
 138         if (sr & (L2C_SR_CPE | L2C_SR_TPE)){
 139                 mtdcr(DCRN_L2C0_ADDR, 0);
 140                 mtdcr(DCRN_L2C0_CMD, L2C_CMD_CCP | L2C_CMD_CTE);
 141         } else
 142                 printk(KERN_EMERG "L2C: LRU error\n");
 143
 144         return IRQ_HANDLED;
 145 }
 146
 147 /* Enable L2 cache */
 148 void __init ibm440gx_l2c_enable(void){
 149         u32 r;
 150         unsigned long flags;
 151
 152         /* Install error handler */
 153         if (request_irq(87, l2c_error_handler, SA_INTERRUPT, "L2C", 0) < 0){
 154                 printk(KERN_ERR "Cannot install L2C error handler, cache is not enabled\n");
 155                 return;
 156         }
 157
 158         local_irq_save(flags);
 159         asm volatile ("sync" ::: "memory");
 160
 161         /* Disable SRAM */
 162         mtdcr(DCRN_SRAM0_DPC,   mfdcr(DCRN_SRAM0_DPC)   & ~SRAM_DPC_ENABLE);
 163         mtdcr(DCRN_SRAM0_SB0CR, mfdcr(DCRN_SRAM0_SB0CR) & ~SRAM_SBCR_BU_MASK);
 164         mtdcr(DCRN_SRAM0_SB1CR, mfdcr(DCRN_SRAM0_SB1CR) & ~SRAM_SBCR_BU_MASK);
 165         mtdcr(DCRN_SRAM0_SB2CR, mfdcr(DCRN_SRAM0_SB2CR) & ~SRAM_SBCR_BU_MASK);
 166         mtdcr(DCRN_SRAM0_SB3CR, mfdcr(DCRN_SRAM0_SB3CR) & ~SRAM_SBCR_BU_MASK);
 167
 168         /* Enable L2_MODE without ICU/DCU */
 169         r = mfdcr(DCRN_L2C0_CFG) & ~(L2C_CFG_ICU | L2C_CFG_DCU | L2C_CFG_SS_MASK);
 170         r |= L2C_CFG_L2M | L2C_CFG_SS_256;
 171         mtdcr(DCRN_L2C0_CFG, r);
 172
 173         mtdcr(DCRN_L2C0_ADDR, 0);
 174
 175         /* Hardware Clear Command */
 176         mtdcr(DCRN_L2C0_CMD, L2C_CMD_HCC);
 177         while (!(mfdcr(DCRN_L2C0_SR) & L2C_SR_CC)) ;
 178
 179         /* Clear Cache Parity and Tag Errors */
 180         mtdcr(DCRN_L2C0_CMD, L2C_CMD_CCP | L2C_CMD_CTE);
 181
 182         /* Enable 64G snoop region starting at 0 */
 183         r = mfdcr(DCRN_L2C0_SNP0) & ~(L2C_SNP_BA_MASK | L2C_SNP_SSR_MASK);
 184         r |= L2C_SNP_SSR_32G | L2C_SNP_ESR;
 185         mtdcr(DCRN_L2C0_SNP0, r);
 186
 187         r = mfdcr(DCRN_L2C0_SNP1) & ~(L2C_SNP_BA_MASK | L2C_SNP_SSR_MASK);
 188         r |= 0x80000000 | L2C_SNP_SSR_32G | L2C_SNP_ESR;
 189         mtdcr(DCRN_L2C0_SNP1, r);
 190
 191         asm volatile ("sync" ::: "memory");
 192
 193         /* Enable ICU/DCU ports */
 194         r = mfdcr(DCRN_L2C0_CFG);
 195         r &= ~(L2C_CFG_DCW_MASK | L2C_CFG_PMUX_MASK | L2C_CFG_PMIM | L2C_CFG_TPEI
 196                 | L2C_CFG_CPEI | L2C_CFG_NAM | L2C_CFG_NBRM);
 197         r |= L2C_CFG_ICU | L2C_CFG_DCU | L2C_CFG_TPC | L2C_CFG_CPC | L2C_CFG_FRAN
 198                 | L2C_CFG_CPIM | L2C_CFG_TPIM | L2C_CFG_LIM | L2C_CFG_SMCM;
 199         mtdcr(DCRN_L2C0_CFG, r);
 200
 201         asm volatile ("sync; isync" ::: "memory");
 202         local_irq_restore(flags);
 203 }
 204
 205 /* Disable L2 cache */
 206 void __init ibm440gx_l2c_disable(void){
 207         u32 r;
 208         unsigned long flags;
 209
 210         local_irq_save(flags);
 211         asm volatile ("sync" ::: "memory");
 212
 213         /* Disable L2C mode */
 214         r = mfdcr(DCRN_L2C0_CFG) & ~(L2C_CFG_L2M | L2C_CFG_ICU | L2C_CFG_DCU);
 215         mtdcr(DCRN_L2C0_CFG, r);
 216
 217         /* Enable SRAM */
 218         mtdcr(DCRN_SRAM0_DPC, mfdcr(DCRN_SRAM0_DPC) | SRAM_DPC_ENABLE);
 219         mtdcr(DCRN_SRAM0_SB0CR,
 220               SRAM_SBCR_BAS0 | SRAM_SBCR_BS_64KB | SRAM_SBCR_BU_RW);
 221         mtdcr(DCRN_SRAM0_SB1CR,
 222               SRAM_SBCR_BAS1 | SRAM_SBCR_BS_64KB | SRAM_SBCR_BU_RW);
 223         mtdcr(DCRN_SRAM0_SB2CR,
 224               SRAM_SBCR_BAS2 | SRAM_SBCR_BS_64KB | SRAM_SBCR_BU_RW);
 225         mtdcr(DCRN_SRAM0_SB3CR,
 226               SRAM_SBCR_BAS3 | SRAM_SBCR_BS_64KB | SRAM_SBCR_BU_RW);
 227
 228         asm volatile ("sync; isync" ::: "memory");
 229         local_irq_restore(flags);
 230 }
 231
 232 void __init ibm440gx_l2c_setup(struct ibm44x_clocks* p)
 233 {
 234         /* Disable L2C on rev.A, rev.B and 800MHz version of rev.C,
 235            enable it on all other revisions
 236          */
 237         if (strcmp(cur_cpu_spec->cpu_name, "440GX Rev. A") == 0 ||
 238                         strcmp(cur_cpu_spec->cpu_name, "440GX Rev. B") == 0
 239                         || (strcmp(cur_cpu_spec->cpu_name, "440GX Rev. C")
 240                                 == 0 && p->cpu > 667000000))
 241                 ibm440gx_l2c_disable();
 242         else
 243                 ibm440gx_l2c_enable();
 244 }
 245
 246 int __init ibm440gx_get_eth_grp(void)
 247 {
 248         return (SDR_READ(DCRN_SDR_PFC1) & DCRN_SDR_PFC1_EPS) >> DCRN_SDR_PFC1_EPS_SHIFT;
 249 }
 250
 251 void __init ibm440gx_set_eth_grp(int group)
 252 {
 253         SDR_WRITE(DCRN_SDR_PFC1, (SDR_READ(DCRN_SDR_PFC1) & ~DCRN_SDR_PFC1_EPS) | (group << DCRN_SDR_PFC1_EPS_SHIFT));
 254 }
 255
 256 void __init ibm440gx_tah_enable(void)
 257 {
 258         /* Enable TAH0 and TAH1 */
 259         SDR_WRITE(DCRN_SDR_MFR,SDR_READ(DCRN_SDR_MFR) &
 260                         ~DCRN_SDR_MFR_TAH0);
 261         SDR_WRITE(DCRN_SDR_MFR,SDR_READ(DCRN_SDR_MFR) &
 262                         ~DCRN_SDR_MFR_TAH1);
 263 }
 264
 265 int ibm440gx_show_cpuinfo(struct seq_file *m){
 266
 267         u32 l2c_cfg = mfdcr(DCRN_L2C0_CFG);
 268         const char* s;
 269         if (l2c_cfg & L2C_CFG_L2M){
 270             switch (l2c_cfg & (L2C_CFG_ICU | L2C_CFG_DCU)){
 271                 case L2C_CFG_ICU: s = "I-Cache only";    break;
 272                 case L2C_CFG_DCU: s = "D-Cache only";    break;
 273                 default:          s = "I-Cache/D-Cache"; break;
 274             }
 275         }
 276         else
 277             s = "disabled";
 278
 279         seq_printf(m, "L2-Cache\t: %s (0x%08x 0x%08x)\n", s,
 280             l2c_cfg, mfdcr(DCRN_L2C0_SR));
 281
 282         return 0;
 283 }
 284