drivers/cache/cache-ncore.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2019 Intel Corporation <www.intel.com>
   4  *
   5  */
   6 #include <dm.h>
   7 #include <wait_bit.h>
   8
   9 #include <asm/io.h>
  10
  11 /* Directory */
  12 #define DIRUSFER                0x80010
  13 #define DIRUCASER0              0x80040
  14 #define DIRUSFMCR               0x80080
  15 #define DIRUSFMAR               0x80084
  16
  17 #define DIRUSFMCR_SFID_SHIFT    16
  18
  19 /* Coherent cache agent interface */
  20 #define CAIUIDR                 0x00ffc
  21
  22 #define CAIUIDR_CA_GET(v)       (((v) & 0x00008000) >> 15)
  23 #define CAIUIDR_TYPE_GET(v)     (((v) & 0x000f0000) >> 16)
  24 #define CAIUIDR_TYPE_ACE_CAI_DVM_SUPPORT        0
  25 #define CAIUIDR_TYPE_ACELITE_CAI_DVM_SUPPORT    1
  26
  27 /* Coherent subsystem */
  28 #define CSADSER0                0xff040
  29 #define CSUIDR                  0xffff8
  30 #define CSIDR                   0xffffc
  31
  32 #define CSUIDR_NUMCAIUS_GET(v)  (((v) & 0x0000007f) >> 0)
  33 #define CSUIDR_NUMDIRUS_GET(v)  (((v) & 0x003f0000) >> 16)
  34 #define CSUIDR_NUMCMIUS_GET(v)  (((v) & 0x3f000000) >> 24)
  35
  36 #define CSIDR_NUMSFS_GET(v)     (((v) & 0x007c0000) >> 18)
  37
  38 #define DIR_REG_SZ              0x1000
  39 #define CAIU_REG_SZ             0x1000
  40
  41 #define CCU_DIR_REG_ADDR(base, reg, dir)        \
  42                 ((base) + (reg) + ((dir) * DIR_REG_SZ))
  43
  44 /* OCRAM firewall register */
  45 #define OCRAM_FW_01                     0x100204
  46 #define OCRAM_SECURE_REGIONS            4
  47
  48 #define OCRAM_PRIVILEGED_MASK           BIT(29)
  49 #define OCRAM_SECURE_MASK               BIT(30)
  50
  51 static void ncore_ccu_init_dirs(void __iomem *base)
  52 {
  53         ulong i, f;
  54         int ret;
  55         u32 num_of_dirs;
  56         u32 num_of_snoop_filters;
  57         u32 reg;
  58
  59         num_of_dirs = CSUIDR_NUMDIRUS_GET(readl(base + CSUIDR));
  60         num_of_snoop_filters =
  61                 CSIDR_NUMSFS_GET(readl(base + CSIDR)) + 1;
  62
  63         /* Initialize each snoop filter in each directory */
  64         for (f = 0; f < num_of_snoop_filters; f++) {
  65                 reg = f << DIRUSFMCR_SFID_SHIFT;
  66                 for (i = 0; i < num_of_dirs; i++) {
  67                         /* Initialize all entries */
  68                         writel(reg, CCU_DIR_REG_ADDR(base, DIRUSFMCR, i));
  69
  70                         /* Poll snoop filter maintenance operation active
  71                          * bit become 0.
  72                          */
  73                         ret = wait_for_bit_le32((const void *)
  74                                                 CCU_DIR_REG_ADDR(base,
  75                                                                  DIRUSFMAR, i),
  76                                                 BIT(0), false, 1000, false);
  77                         if (ret) {
  78                                 puts("CCU: Directory initialization failed!\n");
  79                                 hang();
  80                         }
  81
  82                         /* Enable snoop filter, a bit per snoop filter */
  83                         setbits_le32((ulong)CCU_DIR_REG_ADDR(base, DIRUSFER, i),
  84                                      BIT(f));
  85                 }
  86         }
  87 }
  88
  89 static void ncore_ccu_init_coh_agent(void __iomem *base)
  90 {
  91         u32 num_of_coh_agent_intf;
  92         u32 num_of_dirs;
  93         u32 reg;
  94         u32 type;
  95         u32 i, dir;
  96
  97         num_of_coh_agent_intf =
  98                 CSUIDR_NUMCAIUS_GET(readl(base + CSUIDR));
  99         num_of_dirs = CSUIDR_NUMDIRUS_GET(readl(base + CSUIDR));
 100
 101         for (i = 0; i < num_of_coh_agent_intf; i++) {
 102                 reg = readl(base + CAIUIDR + (i * CAIU_REG_SZ));
 103                 if (CAIUIDR_CA_GET(reg)) {
 104                         /* Caching agent bit is enabled, enable caching agent
 105                          * snoop in each directory
 106                          */
 107                         for (dir = 0; dir < num_of_dirs; dir++) {
 108                                 setbits_le32((ulong)
 109                                              CCU_DIR_REG_ADDR(base, DIRUCASER0,
 110                                                               dir),
 111                                              BIT(i));
 112                         }
 113                 }
 114
 115                 type = CAIUIDR_TYPE_GET(reg);
 116                 if (type == CAIUIDR_TYPE_ACE_CAI_DVM_SUPPORT ||
 117                     type == CAIUIDR_TYPE_ACELITE_CAI_DVM_SUPPORT) {
 118                         /* DVM support is enabled, enable ACE DVM snoop*/
 119                         setbits_le32((ulong)(base + CSADSER0),
 120                                      BIT(i));
 121                 }
 122         }
 123 }
 124
 125 static void ocram_bypass_firewall(void __iomem *base)
 126 {
 127         int i;
 128
 129         for (i = 0; i < OCRAM_SECURE_REGIONS; i++) {
 130                 clrbits_le32(base + OCRAM_FW_01 + (i * sizeof(u32)),
 131                              OCRAM_PRIVILEGED_MASK | OCRAM_SECURE_MASK);
 132         }
 133 }
 134
 135 static int ncore_ccu_probe(struct udevice *dev)
 136 {
 137         void __iomem *base;
 138         fdt_addr_t addr;
 139
 140         addr = dev_read_addr(dev);
 141         if (addr == FDT_ADDR_T_NONE)
 142                 return -EINVAL;
 143
 144         base = (void __iomem *)addr;
 145
 146         ncore_ccu_init_dirs(base);
 147         ncore_ccu_init_coh_agent(base);
 148         ocram_bypass_firewall(base);
 149
 150         return 0;
 151 }
 152
 153 static const struct udevice_id ncore_ccu_ids[] = {
 154         { .compatible = "arteris,ncore-ccu" },
 155         {}
 156 };
 157
 158 U_BOOT_DRIVER(ncore_ccu) = {
 159         .name   = "ncore_ccu",
 160         .id     = UCLASS_CACHE,
 161         .of_match = ncore_ccu_ids,
 162         .probe  = ncore_ccu_probe,
 163         .flags  = DM_FLAG_PRE_RELOC,
 164 };