target/linux/brcm63xx/files/arch/mips/bcm63xx/cpu.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
   7  *               2009 Florian Fainelli <florian@openwrt.org>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/cpu.h>
  13 #include <bcm63xx_cpu.h>
  14 #include <bcm63xx_regs.h>
  15 #include <bcm63xx_io.h>
  16 #include <bcm63xx_irq.h>
  17
  18 const unsigned long *bcm63xx_regs_base;
  19 EXPORT_SYMBOL(bcm63xx_regs_base);
  20
  21 const int *bcm63xx_irqs;
  22 EXPORT_SYMBOL(bcm63xx_irqs);
  23
  24 const unsigned long *bcm63xx_regs_spi;
  25 EXPORT_SYMBOL(bcm63xx_regs_spi);
  26
  27 static u16 bcm63xx_cpu_id;
  28 static u16 bcm63xx_cpu_rev;
  29 static unsigned int bcm63xx_cpu_freq;
  30 static unsigned int bcm63xx_memory_size;
  31
  32 /*
  33  * 6338 register sets and irqs
  34  */
  35
  36 static const unsigned long bcm96338_regs_base[] = {
  37         [RSET_PERF]             = BCM_6338_PERF_BASE,
  38         [RSET_TIMER]            = BCM_6338_TIMER_BASE,
  39         [RSET_WDT]              = BCM_6338_WDT_BASE,
  40         [RSET_UDC0]             = BCM_6338_UDC0_BASE,
  41         [RSET_UART0]            = BCM_6338_UART0_BASE,
  42         [RSET_GPIO]             = BCM_6338_GPIO_BASE,
  43         [RSET_SDRAM]            = BCM_6338_SDRAM_BASE,
  44         [RSET_SPI]              = BCM_6338_SPI_BASE,
  45         [RSET_MEMC]             = BCM_6338_MEMC_BASE,
  46 };
  47
  48 static const int bcm96338_irqs[] = {
  49         [IRQ_TIMER]             = BCM_6338_TIMER_IRQ,
  50         [IRQ_SPI]               = BCM_6338_SPI_IRQ,
  51         [IRQ_UART0]             = BCM_6338_UART0_IRQ,
  52         [IRQ_DSL]               = BCM_6338_DSL_IRQ,
  53         [IRQ_UDC0]              = BCM_6338_UDC0_IRQ,
  54         [IRQ_ENET0]             = BCM_6338_ENET0_IRQ,
  55         [IRQ_ENET_PHY]          = BCM_6338_ENET_PHY_IRQ,
  56         [IRQ_ENET0_RXDMA]       = BCM_6338_ENET0_RXDMA_IRQ,
  57         [IRQ_ENET0_TXDMA]       = BCM_6338_ENET0_TXDMA_IRQ,
  58 };
  59
  60 static const unsigned long bcm96338_regs_spi[] = {
  61         [SPI_CMD]               = SPI_BCM_6338_SPI_CMD,
  62         [SPI_INT_STATUS]        = SPI_BCM_6338_SPI_INT_STATUS,
  63         [SPI_INT_MASK_ST]       = SPI_BCM_6338_SPI_MASK_INT_ST,
  64         [SPI_INT_MASK]          = SPI_BCM_6338_SPI_INT_MASK,
  65         [SPI_ST]                = SPI_BCM_6338_SPI_ST,
  66         [SPI_CLK_CFG]           = SPI_BCM_6338_SPI_CLK_CFG,
  67         [SPI_FILL_BYTE]         = SPI_BCM_6338_SPI_FILL_BYTE,
  68         [SPI_MSG_TAIL]          = SPI_BCM_6338_SPI_MSG_TAIL,
  69         [SPI_RX_TAIL]           = SPI_BCM_6338_SPI_RX_TAIL,
  70         [SPI_MSG_CTL]           = SPI_BCM_6338_SPI_MSG_CTL,
  71         [SPI_MSG_DATA]          = SPI_BCM_6338_SPI_MSG_DATA,
  72         [SPI_RX_DATA]           = SPI_BCM_6338_SPI_RX_DATA,
  73 };
  74
  75 /*
  76  * 6345 register sets and irqs
  77  */
  78
  79 static const unsigned long bcm96345_regs_base[] = {
  80         [RSET_PERF]             = BCM_6345_PERF_BASE,
  81         [RSET_TIMER]            = BCM_6345_TIMER_BASE,
  82         [RSET_WDT]              = BCM_6345_WDT_BASE,
  83         [RSET_UART0]            = BCM_6345_UART0_BASE,
  84         [RSET_GPIO]             = BCM_6345_GPIO_BASE,
  85 };
  86
  87 static const int bcm96345_irqs[] = {
  88         [IRQ_TIMER]             = BCM_6345_TIMER_IRQ,
  89         [IRQ_UART0]             = BCM_6345_UART0_IRQ,
  90         [IRQ_DSL]               = BCM_6345_DSL_IRQ,
  91         [IRQ_ENET0]             = BCM_6345_ENET0_IRQ,
  92         [IRQ_ENET_PHY]          = BCM_6345_ENET_PHY_IRQ,
  93 };
  94
  95 /*
  96  * 6348 register sets and irqs
  97  */
  98 static const unsigned long bcm96348_regs_base[] = {
  99         [RSET_DSL_LMEM]         = BCM_6348_DSL_LMEM_BASE,
 100         [RSET_PERF]             = BCM_6348_PERF_BASE,
 101         [RSET_TIMER]            = BCM_6348_TIMER_BASE,
 102         [RSET_WDT]              = BCM_6348_WDT_BASE,
 103         [RSET_UART0]            = BCM_6348_UART0_BASE,
 104         [RSET_GPIO]             = BCM_6348_GPIO_BASE,
 105         [RSET_SPI]              = BCM_6348_SPI_BASE,
 106         [RSET_OHCI0]            = BCM_6348_OHCI0_BASE,
 107         [RSET_OHCI_PRIV]        = BCM_6348_OHCI_PRIV_BASE,
 108         [RSET_USBH_PRIV]        = BCM_6348_USBH_PRIV_BASE,
 109         [RSET_UDC0]             = BCM_6348_UDC0_BASE,
 110         [RSET_MPI]              = BCM_6348_MPI_BASE,
 111         [RSET_PCMCIA]           = BCM_6348_PCMCIA_BASE,
 112         [RSET_SDRAM]            = BCM_6348_SDRAM_BASE,
 113         [RSET_DSL]              = BCM_6348_DSL_BASE,
 114         [RSET_ENET0]            = BCM_6348_ENET0_BASE,
 115         [RSET_ENET1]            = BCM_6348_ENET1_BASE,
 116         [RSET_ENETDMA]          = BCM_6348_ENETDMA_BASE,
 117         [RSET_MEMC]             = BCM_6348_MEMC_BASE,
 118         [RSET_DDR]              = BCM_6348_DDR_BASE,
 119 };
 120
 121 static const int bcm96348_irqs[] = {
 122         [IRQ_TIMER]             = BCM_6348_TIMER_IRQ,
 123         [IRQ_SPI]               = BCM_6348_SPI_IRQ,
 124         [IRQ_UART0]             = BCM_6348_UART0_IRQ,
 125         [IRQ_DSL]               = BCM_6348_DSL_IRQ,
 126         [IRQ_UDC0]              = BCM_6348_UDC0_IRQ,
 127         [IRQ_ENET0]             = BCM_6348_ENET0_IRQ,
 128         [IRQ_ENET1]             = BCM_6348_ENET1_IRQ,
 129         [IRQ_ENET_PHY]          = BCM_6348_ENET_PHY_IRQ,
 130         [IRQ_OHCI0]             = BCM_6348_OHCI0_IRQ,
 131         [IRQ_PCMCIA]            = BCM_6348_PCMCIA_IRQ,
 132         [IRQ_ENET0_RXDMA]       = BCM_6348_ENET0_RXDMA_IRQ,
 133         [IRQ_ENET0_TXDMA]       = BCM_6348_ENET0_TXDMA_IRQ,
 134         [IRQ_ENET1_RXDMA]       = BCM_6348_ENET1_RXDMA_IRQ,
 135         [IRQ_ENET1_TXDMA]       = BCM_6348_ENET1_TXDMA_IRQ,
 136         [IRQ_PCI]               = BCM_6348_PCI_IRQ,
 137 };
 138
 139 static const unsigned long bcm96348_regs_spi[] = {
 140         [SPI_CMD]               = SPI_BCM_6348_SPI_CMD,
 141         [SPI_INT_STATUS]        = SPI_BCM_6348_SPI_INT_STATUS,
 142         [SPI_INT_MASK_ST]       = SPI_BCM_6348_SPI_MASK_INT_ST,
 143         [SPI_INT_MASK]          = SPI_BCM_6348_SPI_INT_MASK,
 144         [SPI_ST]                = SPI_BCM_6348_SPI_ST,
 145         [SPI_CLK_CFG]           = SPI_BCM_6348_SPI_CLK_CFG,
 146         [SPI_FILL_BYTE]         = SPI_BCM_6348_SPI_FILL_BYTE,
 147         [SPI_MSG_TAIL]          = SPI_BCM_6348_SPI_MSG_TAIL,
 148         [SPI_RX_TAIL]           = SPI_BCM_6348_SPI_RX_TAIL,
 149         [SPI_MSG_CTL]           = SPI_BCM_6348_SPI_MSG_CTL,
 150         [SPI_MSG_DATA]          = SPI_BCM_6348_SPI_MSG_DATA,
 151         [SPI_RX_DATA]           = SPI_BCM_6348_SPI_RX_DATA,
 152 };
 153
 154 /*
 155  * 6358 register sets and irqs
 156  */
 157 static const unsigned long bcm96358_regs_base[] = {
 158         [RSET_DSL_LMEM]         = BCM_6358_DSL_LMEM_BASE,
 159         [RSET_PERF]             = BCM_6358_PERF_BASE,
 160         [RSET_TIMER]            = BCM_6358_TIMER_BASE,
 161         [RSET_WDT]              = BCM_6358_WDT_BASE,
 162         [RSET_UART0]            = BCM_6358_UART0_BASE,
 163         [RSET_GPIO]             = BCM_6358_GPIO_BASE,
 164         [RSET_SPI]              = BCM_6358_SPI_BASE,
 165         [RSET_OHCI0]            = BCM_6358_OHCI0_BASE,
 166         [RSET_EHCI0]            = BCM_6358_EHCI0_BASE,
 167         [RSET_OHCI_PRIV]        = BCM_6358_OHCI_PRIV_BASE,
 168         [RSET_USBH_PRIV]        = BCM_6358_USBH_PRIV_BASE,
 169         [RSET_MPI]              = BCM_6358_MPI_BASE,
 170         [RSET_PCMCIA]           = BCM_6358_PCMCIA_BASE,
 171         [RSET_SDRAM]            = BCM_6358_SDRAM_BASE,
 172         [RSET_DSL]              = BCM_6358_DSL_BASE,
 173         [RSET_ENET0]            = BCM_6358_ENET0_BASE,
 174         [RSET_ENET1]            = BCM_6358_ENET1_BASE,
 175         [RSET_ENETDMA]          = BCM_6358_ENETDMA_BASE,
 176         [RSET_MEMC]             = BCM_6358_MEMC_BASE,
 177         [RSET_DDR]              = BCM_6358_DDR_BASE,
 178 };
 179
 180 static const int bcm96358_irqs[] = {
 181         [IRQ_TIMER]             = BCM_6358_TIMER_IRQ,
 182         [IRQ_SPI]               = BCM_6358_SPI_IRQ,
 183         [IRQ_UART0]             = BCM_6358_UART0_IRQ,
 184         [IRQ_DSL]               = BCM_6358_DSL_IRQ,
 185         [IRQ_ENET0]             = BCM_6358_ENET0_IRQ,
 186         [IRQ_ENET1]             = BCM_6358_ENET1_IRQ,
 187         [IRQ_ENET_PHY]          = BCM_6358_ENET_PHY_IRQ,
 188         [IRQ_OHCI0]             = BCM_6358_OHCI0_IRQ,
 189         [IRQ_EHCI0]             = BCM_6358_EHCI0_IRQ,
 190         [IRQ_PCMCIA]            = BCM_6358_PCMCIA_IRQ,
 191         [IRQ_ENET0_RXDMA]       = BCM_6358_ENET0_RXDMA_IRQ,
 192         [IRQ_ENET0_TXDMA]       = BCM_6358_ENET0_TXDMA_IRQ,
 193         [IRQ_ENET1_RXDMA]       = BCM_6358_ENET1_RXDMA_IRQ,
 194         [IRQ_ENET1_TXDMA]       = BCM_6358_ENET1_TXDMA_IRQ,
 195         [IRQ_PCI]               = BCM_6358_PCI_IRQ,
 196 };
 197
 198 static const unsigned long bcm96358_regs_spi[] = {
 199         [SPI_CMD]               = SPI_BCM_6358_SPI_CMD,
 200         [SPI_INT_STATUS]        = SPI_BCM_6358_SPI_INT_STATUS,
 201         [SPI_INT_MASK_ST]       = SPI_BCM_6358_SPI_MASK_INT_ST,
 202         [SPI_INT_MASK]          = SPI_BCM_6358_SPI_INT_MASK,
 203         [SPI_ST]                = SPI_BCM_6358_SPI_STATUS,
 204         [SPI_CLK_CFG]           = SPI_BCM_6358_SPI_CLK_CFG,
 205         [SPI_FILL_BYTE]         = SPI_BCM_6358_SPI_FILL_BYTE,
 206         [SPI_MSG_TAIL]          = SPI_BCM_6358_SPI_MSG_TAIL,
 207         [SPI_RX_TAIL]           = SPI_BCM_6358_SPI_RX_TAIL,
 208         [SPI_MSG_CTL]           = SPI_BCM_6358_MSG_CTL,
 209         [SPI_MSG_DATA]          = SPI_BCM_6358_SPI_MSG_DATA,
 210         [SPI_RX_DATA]           = SPI_BCM_6358_SPI_RX_DATA,
 211 };
 212
 213 u16 __bcm63xx_get_cpu_id(void)
 214 {
 215         return bcm63xx_cpu_id;
 216 }
 217
 218 EXPORT_SYMBOL(__bcm63xx_get_cpu_id);
 219
 220 u16 bcm63xx_get_cpu_rev(void)
 221 {
 222         return bcm63xx_cpu_rev;
 223 }
 224
 225 EXPORT_SYMBOL(bcm63xx_get_cpu_rev);
 226
 227 unsigned int bcm63xx_get_cpu_freq(void)
 228 {
 229         return bcm63xx_cpu_freq;
 230 }
 231
 232 unsigned int bcm63xx_get_memory_size(void)
 233 {
 234         return bcm63xx_memory_size;
 235 }
 236
 237 static unsigned int detect_cpu_clock(void)
 238 {
 239         unsigned int tmp, n1 = 0, n2 = 0, m1 = 0;
 240
 241         if (BCMCPU_IS_6338())
 242                 return 240000000;
 243
 244         if (BCMCPU_IS_6345())
 245                 return 140000000;
 246
 247         /*
 248          * frequency depends on PLL configuration:
 249          */
 250         if (BCMCPU_IS_6348()) {
 251                 /* 16MHz * (N1 + 1) * (N2 + 2) / (M1_CPU + 1) */
 252                 tmp = bcm_perf_readl(PERF_MIPSPLLCTL_REG);
 253                 n1 = (tmp & MIPSPLLCTL_N1_MASK) >> MIPSPLLCTL_N1_SHIFT;
 254                 n2 = (tmp & MIPSPLLCTL_N2_MASK) >> MIPSPLLCTL_N2_SHIFT;
 255                 m1 = (tmp & MIPSPLLCTL_M1CPU_MASK) >> MIPSPLLCTL_M1CPU_SHIFT;
 256                 n1 += 1;
 257                 n2 += 2;
 258                 m1 += 1;
 259         }
 260
 261         if (BCMCPU_IS_6358()) {
 262                 /* 16MHz * N1 * N2 / M1_CPU */
 263                 tmp = bcm_ddr_readl(DDR_DMIPSPLLCFG_REG);
 264                 n1 = (tmp & DMIPSPLLCFG_N1_MASK) >> DMIPSPLLCFG_N1_SHIFT;
 265                 n2 = (tmp & DMIPSPLLCFG_N2_MASK) >> DMIPSPLLCFG_N2_SHIFT;
 266                 m1 = (tmp & DMIPSPLLCFG_M1_MASK) >> DMIPSPLLCFG_M1_SHIFT;
 267         }
 268
 269         return (16 * 1000000 * n1 * n2) / m1;
 270 }
 271
 272 /*
 273  * attempt to detect the amount of memory installed
 274  */
 275 static unsigned int detect_memory_size(void)
 276 {
 277         unsigned int cols = 0, rows = 0, is_32bits = 0, banks = 0;
 278         u32 val;
 279
 280         if (BCMCPU_IS_6338() || BCMCPU_IS_6348()) {
 281                 val = bcm_sdram_readl(SDRAM_CFG_REG);
 282                 rows = (val & SDRAM_CFG_ROW_MASK) >> SDRAM_CFG_ROW_SHIFT;
 283                 cols = (val & SDRAM_CFG_COL_MASK) >> SDRAM_CFG_COL_SHIFT;
 284                 is_32bits = (val & SDRAM_CFG_32B_MASK) ? 1 : 0;
 285                 banks = (val & SDRAM_CFG_BANK_MASK) ? 2 : 1;
 286         }
 287
 288         if (BCMCPU_IS_6358()) {
 289                 val = bcm_memc_readl(MEMC_CFG_REG);
 290                 rows = (val & MEMC_CFG_ROW_MASK) >> MEMC_CFG_ROW_SHIFT;
 291                 cols = (val & MEMC_CFG_COL_MASK) >> MEMC_CFG_COL_SHIFT;
 292                 is_32bits = (val & MEMC_CFG_32B_MASK) ? 0 : 1;
 293                 banks = 2;
 294         }
 295
 296         /* 0 => 11 address bits ... 2 => 13 address bits */
 297         rows += 11;
 298
 299         /* 0 => 8 address bits ... 2 => 10 address bits */
 300         cols += 8;
 301
 302         return 1 << (cols + rows + (is_32bits + 1) + banks);
 303 }
 304
 305 void __init bcm63xx_cpu_init(void)
 306 {
 307         unsigned int tmp, expected_cpu_id;
 308         struct cpuinfo_mips *c = &current_cpu_data;
 309
 310         /* soc registers location depends on cpu type */
 311         expected_cpu_id = 0;
 312
 313         switch (c->cputype) {
 314         case CPU_BCM3302:
 315                 expected_cpu_id = BCM6338_CPU_ID;
 316                 bcm63xx_regs_base = bcm96338_regs_base;
 317                 bcm63xx_irqs = bcm96338_irqs;
 318                 bcm63xx_regs_spi = bcm96338_regs_spi;
 319                 break;
 320         case CPU_BCM6345:
 321                 expected_cpu_id = BCM6345_CPU_ID;
 322                 bcm63xx_regs_base = bcm96345_regs_base;
 323                 bcm63xx_irqs = bcm96345_irqs;
 324                 break;
 325         case CPU_BCM6348:
 326                 expected_cpu_id = BCM6348_CPU_ID;
 327                 bcm63xx_regs_base = bcm96348_regs_base;
 328                 bcm63xx_irqs = bcm96348_irqs;
 329                 bcm63xx_regs_spi = bcm96348_regs_spi;
 330                 break;
 331         case CPU_BCM6358:
 332                 expected_cpu_id = BCM6358_CPU_ID;
 333                 bcm63xx_regs_base = bcm96358_regs_base;
 334                 bcm63xx_irqs = bcm96358_irqs;
 335                 bcm63xx_regs_spi = bcm96358_regs_spi;
 336                 break;
 337         }
 338
 339         /* really early to panic, but delaying panic would not help
 340          * since we will never get any working console */
 341         if (!expected_cpu_id)
 342                 panic("unsupported Broadcom CPU");
 343
 344         /*
 345          * bcm63xx_regs_base is set, we can access soc registers
 346          */
 347
 348         /* double check CPU type */
 349         tmp = bcm_perf_readl(PERF_REV_REG);
 350         bcm63xx_cpu_id = (tmp & REV_CHIPID_MASK) >> REV_CHIPID_SHIFT;
 351         bcm63xx_cpu_rev = (tmp & REV_REVID_MASK) >> REV_REVID_SHIFT;
 352
 353         if (bcm63xx_cpu_id != expected_cpu_id)
 354                 panic("bcm63xx CPU id mismatch");
 355
 356         bcm63xx_cpu_freq = detect_cpu_clock();
 357         bcm63xx_memory_size = detect_memory_size();
 358
 359         printk(KERN_INFO "Detected Broadcom 0x%04x CPU revision %02x\n",
 360                bcm63xx_cpu_id, bcm63xx_cpu_rev);
 361         printk(KERN_INFO "CPU frequency is %u Hz\n",
 362                bcm63xx_cpu_freq);
 363         printk(KERN_INFO "%uMB of RAM installed\n",
 364                bcm63xx_memory_size >> 20);
 365 }