FreeBSD/Linux Kernel Cross Reference
sys/arm/mv/armadaxp/armadaxp.c

     /*-
      * Copyright (c) 2011 Semihalf.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * From: FreeBSD: src/sys/arm/mv/kirkwood/sheevaplug.c,v 1.2 2010/06/13 13:28:53
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD$");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/bus.h>
    
    #include <machine/bus.h>
    #include <machine/armreg.h>
    
    #include <arm/mv/mvwin.h>
    #include <arm/mv/mvreg.h>
    #include <arm/mv/mvvar.h>
    
    #include <dev/fdt/fdt_common.h>
    #include <dev/ofw/openfirm.h>
    
    #include <machine/fdt.h>
    
    #define CPU_FREQ_FIELD(sar)     (((0x01 & (sar >> 52)) << 3) | \
                                        (0x07 & (sar >> 21)))
    #define FAB_FREQ_FIELD(sar)     (((0x01 & (sar >> 51)) << 4) | \
                                        (0x0F & (sar >> 24)))
    
    static uint32_t count_l2clk(void);
    void armadaxp_l2_init(void);
    void armadaxp_init_coher_fabric(void);
    int platform_get_ncpus(void);
    
    #define ARMADAXP_L2_BASE                (MV_BASE + 0x8000)
    #define ARMADAXP_L2_CTRL                0x100
    #define L2_ENABLE                       (1 << 0)
    #define ARMADAXP_L2_AUX_CTRL            0x104
    #define L2_WBWT_MODE_MASK               (3 << 0)
    #define L2_WBWT_MODE_PAGE               0
    #define L2_WBWT_MODE_WB                 1
    #define L2_WBWT_MODE_WT                 2
    #define L2_REP_STRAT_MASK               (3 << 27)
    #define L2_REP_STRAT_LSFR               (1 << 27)
    #define L2_REP_STRAT_SEMIPLRU           (3 << 27)
    
    #define ARMADAXP_L2_CNTR_CTRL           0x200
    #define ARMADAXP_L2_CNTR_CONF(x)        (0x204 + (x) * 0xc)
    #define ARMADAXP_L2_CNTR2_VAL_LOW       (0x208 + (x) * 0xc)
    #define ARMADAXP_L2_CNTR2_VAL_HI        (0x20c + (x) * 0xc)
    
    #define ARMADAXP_L2_INT_CAUSE           0x220
    
    #define ARMADAXP_L2_SYNC_BARRIER        0x700
    #define ARMADAXP_L2_INV_WAY             0x778
    #define ARMADAXP_L2_CLEAN_WAY           0x7BC
    #define ARMADAXP_L2_FLUSH_PHYS          0x7F0
    #define ARMADAXP_L2_FLUSH_WAY           0x7FC
    
    #define MV_COHERENCY_FABRIC_BASE        (MV_MBUS_BRIDGE_BASE + 0x200)
    #define COHER_FABRIC_CTRL               0x00
    #define COHER_FABRIC_CONF               0x04
    #define COHER_FABRIC_CFU                0x28
    #define COHER_FABRIC_CIB_CTRL           0x80
    
    struct vco_freq_ratio {
            uint8_t vco_cpu;        /* VCO to CLK0(CPU) clock ratio */
            uint8_t vco_l2c;        /* VCO to NB(L2 cache) clock ratio */
            uint8_t vco_hcl;        /* VCO to HCLK(DDR controller) clock ratio */
            uint8_t vco_ddr;        /* VCO to DR(DDR memory) clock ratio */
    };
    
    static struct vco_freq_ratio freq_conf_table[] = {
    /*00*/  { 1, 1,  4,  2 },
    /*01*/  { 1, 2,  2,  2 },
    /*02*/  { 2, 2,  6,  3 },
   /*03*/  { 2, 2,  3,  3 },
   /*04*/  { 1, 2,  3,  3 },
   /*05*/  { 1, 2,  4,  2 },
   /*06*/  { 1, 1,  2,  2 },
   /*07*/  { 2, 3,  6,  6 },
   /*08*/  { 2, 3,  5,  5 },
   /*09*/  { 1, 2,  6,  3 },
   /*10*/  { 2, 4, 10,  5 },
   /*11*/  { 1, 3,  6,  6 },
   /*12*/  { 1, 2,  5,  5 },
   /*13*/  { 1, 3,  6,  3 },
   /*14*/  { 1, 2,  5,  5 },
   /*15*/  { 2, 2,  5,  5 },
   /*16*/  { 1, 1,  3,  3 },
   /*17*/  { 2, 5, 10, 10 },
   /*18*/  { 1, 3,  8,  4 },
   /*19*/  { 1, 1,  2,  1 },
   /*20*/  { 2, 3,  6,  3 },
   /*21*/  { 1, 2,  8,  4 },
   /*22*/  { 2, 5, 10,  5 }
   };
   
   static uint16_t cpu_clock_table[] = {
       1000, 1066, 1200, 1333, 1500, 1666, 1800, 2000, 600,  667,  800,  1600,
       2133, 2200, 2400 };
   
   uint32_t
   get_tclk(void)
   {
           uint32_t cputype;
   
           cputype = cpu_ident();
           cputype &= CPU_ID_CPU_MASK;
   
           if (cputype == CPU_ID_MV88SV584X_V7)
                   return (TCLK_250MHZ);
           else
                   return (TCLK_200MHZ);
   }
   
   static uint32_t
   count_l2clk(void)
   {
           uint64_t sar_reg;
           uint32_t freq_vco, freq_l2clk;
           uint8_t  sar_cpu_freq, sar_fab_freq, array_size;
   
           /* Get value of the SAR register and process it */
           sar_reg = get_sar_value();
           sar_cpu_freq = CPU_FREQ_FIELD(sar_reg);
           sar_fab_freq = FAB_FREQ_FIELD(sar_reg);
   
           /* Check if CPU frequency field has correct value */
           array_size = nitems(cpu_clock_table);
           if (sar_cpu_freq >= array_size)
                   panic("Reserved value in cpu frequency configuration field: "
                       "%d", sar_cpu_freq);
   
           /* Check if fabric frequency field has correct value */
           array_size = nitems(freq_conf_table);
           if (sar_fab_freq >= array_size)
                   panic("Reserved value in fabric frequency configuration field: "
                       "%d", sar_fab_freq);
   
           /* Get CPU clock frequency */
           freq_vco = cpu_clock_table[sar_cpu_freq] *
               freq_conf_table[sar_fab_freq].vco_cpu;
   
           /* Get L2CLK clock frequency */
           freq_l2clk = freq_vco / freq_conf_table[sar_fab_freq].vco_l2c;
   
           /* Round L2CLK value to integer MHz */
           if (((freq_vco % freq_conf_table[sar_fab_freq].vco_l2c) * 10 /
               freq_conf_table[sar_fab_freq].vco_l2c) >= 5)
                   freq_l2clk++;
   
           return (freq_l2clk * 1000000);
   }
   
   uint32_t
   get_l2clk(void)
   {
           static uint32_t l2clk_freq = 0;
   
           /* If get_l2clk is called first time get L2CLK value from register */
           if (l2clk_freq == 0)
                   l2clk_freq = count_l2clk();
   
           return (l2clk_freq);
   }
   
   static uint32_t
   read_coher_fabric(uint32_t reg)
   {
   
           return (bus_space_read_4(fdtbus_bs_tag, MV_COHERENCY_FABRIC_BASE, reg));
   }
   
   static void
   write_coher_fabric(uint32_t reg, uint32_t val)
   {
   
           bus_space_write_4(fdtbus_bs_tag, MV_COHERENCY_FABRIC_BASE, reg, val);
   }
   
   int
   platform_get_ncpus(void)
   {
   #if !defined(SMP)
           return (1);
   #else
           return ((read_coher_fabric(COHER_FABRIC_CONF) & 0xf) + 1);
   #endif
   }
   
   void
   armadaxp_init_coher_fabric(void)
   {
           uint32_t val, cpus, mask;
   
           cpus = platform_get_ncpus();
           mask = (1 << cpus) - 1;
           val = read_coher_fabric(COHER_FABRIC_CTRL);
           val |= (mask << 24);
           write_coher_fabric(COHER_FABRIC_CTRL, val);
   
           val = read_coher_fabric(COHER_FABRIC_CONF);
           val |= (mask << 24);
           val |= (1 << 15);
           write_coher_fabric(COHER_FABRIC_CONF, val);
   }
   
   #define ALL_WAYS        0xffffffff
   
   /* L2 cache configuration registers */
   static uint32_t
   read_l2_cache(uint32_t reg)
   {
   
           return (bus_space_read_4(fdtbus_bs_tag, ARMADAXP_L2_BASE, reg));
   }
   
   static void
   write_l2_cache(uint32_t reg, uint32_t val)
   {
   
           bus_space_write_4(fdtbus_bs_tag, ARMADAXP_L2_BASE, reg, val);
   }
   
   static void
   armadaxp_l2_idcache_inv_all(void)
   {
           write_l2_cache(ARMADAXP_L2_INV_WAY, ALL_WAYS);
   }
   
   void
   armadaxp_l2_init(void)
   {
           u_int32_t reg;
   
           /* Set L2 policy */
           reg = read_l2_cache(ARMADAXP_L2_AUX_CTRL);
           reg &= ~(L2_WBWT_MODE_MASK);
           reg &= ~(L2_REP_STRAT_MASK);
           reg |= L2_REP_STRAT_SEMIPLRU;
           reg |= L2_WBWT_MODE_WT;
           write_l2_cache(ARMADAXP_L2_AUX_CTRL, reg);
   
           /* Invalidate l2 cache */
           armadaxp_l2_idcache_inv_all();
   
           /* Clear pending L2 interrupts */
           write_l2_cache(ARMADAXP_L2_INT_CAUSE, 0x1ff);
   
           /* Enable l2 cache */
           reg = read_l2_cache(ARMADAXP_L2_CTRL);
           write_l2_cache(ARMADAXP_L2_CTRL, reg | L2_ENABLE);
   
           /*
            * For debug purposes
            * Configure and enable counter
            */
           write_l2_cache(ARMADAXP_L2_CNTR_CONF(0), 0xf0000 | (4 << 2));
           write_l2_cache(ARMADAXP_L2_CNTR_CONF(1), 0xf0000 | (2 << 2));
           write_l2_cache(ARMADAXP_L2_CNTR_CTRL, 0x303);
   
           /*
            * Enable Cache maintenance operation propagation in coherency fabric
            * Change point of coherency and point of unification to DRAM.
            */
           reg = read_coher_fabric(COHER_FABRIC_CFU);
           reg |= (1 << 17) | (1 << 18);
           write_coher_fabric(COHER_FABRIC_CFU, reg);
   
           /* Coherent IO Bridge initialization */
           reg = read_coher_fabric(COHER_FABRIC_CIB_CTRL);
           reg &= ~(7 << 16);
           reg |= (7 << 16);
           write_coher_fabric(COHER_FABRIC_CIB_CTRL, reg);
   }
   

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