drivers/soc/atmel/soc.c

   1 /*
   2  * Copyright (C) 2015 Atmel
   3  *
   4  * Alexandre Belloni <alexandre.belloni@free-electrons.com
   5  * Boris Brezillon <boris.brezillon@free-electrons.com
   6  *
   7  * This file is licensed under the terms of the GNU General Public
   8  * License version 2.  This program is licensed "as is" without any
   9  * warranty of any kind, whether express or implied.
  10  *
  11  */
  12
  13 #define pr_fmt(fmt)     "AT91: " fmt
  14
  15 #include <linux/io.h>
  16 #include <linux/of.h>
  17 #include <linux/of_address.h>
  18 #include <linux/of_platform.h>
  19 #include <linux/slab.h>
  20 #include <linux/sys_soc.h>
  21
  22 #include "soc.h"
  23
  24 #define AT91_DBGU_CIDR                  0x40
  25 #define AT91_DBGU_EXID                  0x44
  26 #define AT91_CHIPID_CIDR                0x00
  27 #define AT91_CHIPID_EXID                0x04
  28 #define AT91_CIDR_VERSION(x)            ((x) & 0x1f)
  29 #define AT91_CIDR_EXT                   BIT(31)
  30 #define AT91_CIDR_MATCH_MASK            0x7fffffe0
  31
  32 static const struct at91_soc __initconst socs[] = {
  33 #ifdef CONFIG_SOC_AT91RM9200
  34         AT91_SOC(AT91RM9200_CIDR_MATCH, 0, "at91rm9200 BGA", "at91rm9200"),
  35 #endif
  36 #ifdef CONFIG_SOC_AT91SAM9
  37         AT91_SOC(AT91SAM9260_CIDR_MATCH, 0, "at91sam9260", NULL),
  38         AT91_SOC(AT91SAM9261_CIDR_MATCH, 0, "at91sam9261", NULL),
  39         AT91_SOC(AT91SAM9263_CIDR_MATCH, 0, "at91sam9263", NULL),
  40         AT91_SOC(AT91SAM9G20_CIDR_MATCH, 0, "at91sam9g20", NULL),
  41         AT91_SOC(AT91SAM9RL64_CIDR_MATCH, 0, "at91sam9rl64", NULL),
  42         AT91_SOC(AT91SAM9G45_CIDR_MATCH, AT91SAM9M11_EXID_MATCH,
  43                  "at91sam9m11", "at91sam9g45"),
  44         AT91_SOC(AT91SAM9G45_CIDR_MATCH, AT91SAM9M10_EXID_MATCH,
  45                  "at91sam9m10", "at91sam9g45"),
  46         AT91_SOC(AT91SAM9G45_CIDR_MATCH, AT91SAM9G46_EXID_MATCH,
  47                  "at91sam9g46", "at91sam9g45"),
  48         AT91_SOC(AT91SAM9G45_CIDR_MATCH, AT91SAM9G45_EXID_MATCH,
  49                  "at91sam9g45", "at91sam9g45"),
  50         AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9G15_EXID_MATCH,
  51                  "at91sam9g15", "at91sam9x5"),
  52         AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9G35_EXID_MATCH,
  53                  "at91sam9g35", "at91sam9x5"),
  54         AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9X35_EXID_MATCH,
  55                  "at91sam9x35", "at91sam9x5"),
  56         AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9G25_EXID_MATCH,
  57                  "at91sam9g25", "at91sam9x5"),
  58         AT91_SOC(AT91SAM9X5_CIDR_MATCH, AT91SAM9X25_EXID_MATCH,
  59                  "at91sam9x25", "at91sam9x5"),
  60         AT91_SOC(AT91SAM9N12_CIDR_MATCH, AT91SAM9CN12_EXID_MATCH,
  61                  "at91sam9cn12", "at91sam9n12"),
  62         AT91_SOC(AT91SAM9N12_CIDR_MATCH, AT91SAM9N12_EXID_MATCH,
  63                  "at91sam9n12", "at91sam9n12"),
  64         AT91_SOC(AT91SAM9N12_CIDR_MATCH, AT91SAM9CN11_EXID_MATCH,
  65                  "at91sam9cn11", "at91sam9n12"),
  66         AT91_SOC(AT91SAM9XE128_CIDR_MATCH, 0, "at91sam9xe128", "at91sam9xe128"),
  67         AT91_SOC(AT91SAM9XE256_CIDR_MATCH, 0, "at91sam9xe256", "at91sam9xe256"),
  68         AT91_SOC(AT91SAM9XE512_CIDR_MATCH, 0, "at91sam9xe512", "at91sam9xe512"),
  69 #endif
  70 #ifdef CONFIG_SOC_SAMA5
  71         AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D21CU_EXID_MATCH,
  72                  "sama5d21", "sama5d2"),
  73         AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D22CU_EXID_MATCH,
  74                  "sama5d22", "sama5d2"),
  75         AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D23CU_EXID_MATCH,
  76                  "sama5d23", "sama5d2"),
  77         AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D24CX_EXID_MATCH,
  78                  "sama5d24", "sama5d2"),
  79         AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D24CU_EXID_MATCH,
  80                  "sama5d24", "sama5d2"),
  81         AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D26CU_EXID_MATCH,
  82                  "sama5d26", "sama5d2"),
  83         AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D27CU_EXID_MATCH,
  84                  "sama5d27", "sama5d2"),
  85         AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D27CN_EXID_MATCH,
  86                  "sama5d27", "sama5d2"),
  87         AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D28CU_EXID_MATCH,
  88                  "sama5d28", "sama5d2"),
  89         AT91_SOC(SAMA5D2_CIDR_MATCH, SAMA5D28CN_EXID_MATCH,
  90                  "sama5d28", "sama5d2"),
  91         AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D31_EXID_MATCH,
  92                  "sama5d31", "sama5d3"),
  93         AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D33_EXID_MATCH,
  94                  "sama5d33", "sama5d3"),
  95         AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D34_EXID_MATCH,
  96                  "sama5d34", "sama5d3"),
  97         AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D35_EXID_MATCH,
  98                  "sama5d35", "sama5d3"),
  99         AT91_SOC(SAMA5D3_CIDR_MATCH, SAMA5D36_EXID_MATCH,
 100                  "sama5d36", "sama5d3"),
 101         AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D41_EXID_MATCH,
 102                  "sama5d41", "sama5d4"),
 103         AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D42_EXID_MATCH,
 104                  "sama5d42", "sama5d4"),
 105         AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D43_EXID_MATCH,
 106                  "sama5d43", "sama5d4"),
 107         AT91_SOC(SAMA5D4_CIDR_MATCH, SAMA5D44_EXID_MATCH,
 108                  "sama5d44", "sama5d4"),
 109 #endif
 110         { /* sentinel */ },
 111 };
 112
 113 static int __init at91_get_cidr_exid_from_dbgu(u32 *cidr, u32 *exid)
 114 {
 115         struct device_node *np;
 116         void __iomem *regs;
 117
 118         np = of_find_compatible_node(NULL, NULL, "atmel,at91rm9200-dbgu");
 119         if (!np)
 120                 np = of_find_compatible_node(NULL, NULL,
 121                                              "atmel,at91sam9260-dbgu");
 122         if (!np)
 123                 return -ENODEV;
 124
 125         regs = of_iomap(np, 0);
 126         of_node_put(np);
 127
 128         if (!regs) {
 129                 pr_warn("Could not map DBGU iomem range");
 130                 return -ENXIO;
 131         }
 132
 133         *cidr = readl(regs + AT91_DBGU_CIDR);
 134         *exid = readl(regs + AT91_DBGU_EXID);
 135
 136         iounmap(regs);
 137
 138         return 0;
 139 }
 140
 141 static int __init at91_get_cidr_exid_from_chipid(u32 *cidr, u32 *exid)
 142 {
 143         struct device_node *np;
 144         void __iomem *regs;
 145
 146         np = of_find_compatible_node(NULL, NULL, "atmel,sama5d2-chipid");
 147         if (!np)
 148                 return -ENODEV;
 149
 150         regs = of_iomap(np, 0);
 151         of_node_put(np);
 152
 153         if (!regs) {
 154                 pr_warn("Could not map DBGU iomem range");
 155                 return -ENXIO;
 156         }
 157
 158         *cidr = readl(regs + AT91_CHIPID_CIDR);
 159         *exid = readl(regs + AT91_CHIPID_EXID);
 160
 161         iounmap(regs);
 162
 163         return 0;
 164 }
 165
 166 struct soc_device * __init at91_soc_init(const struct at91_soc *socs)
 167 {
 168         struct soc_device_attribute *soc_dev_attr;
 169         const struct at91_soc *soc;
 170         struct soc_device *soc_dev;
 171         u32 cidr, exid;
 172         int ret;
 173
 174         /*
 175          * With SAMA5D2 and later SoCs, CIDR and EXID registers are no more
 176          * in the dbgu device but in the chipid device whose purpose is only
 177          * to expose these two registers.
 178          */
 179         ret = at91_get_cidr_exid_from_dbgu(&cidr, &exid);
 180         if (ret)
 181                 ret = at91_get_cidr_exid_from_chipid(&cidr, &exid);
 182         if (ret) {
 183                 if (ret == -ENODEV)
 184                         pr_warn("Could not find identification node");
 185                 return NULL;
 186         }
 187
 188         for (soc = socs; soc->name; soc++) {
 189                 if (soc->cidr_match != (cidr & AT91_CIDR_MATCH_MASK))
 190                         continue;
 191
 192                 if (!(cidr & AT91_CIDR_EXT) || soc->exid_match == exid)
 193                         break;
 194         }
 195
 196         if (!soc->name) {
 197                 pr_warn("Could not find matching SoC description\n");
 198                 return NULL;
 199         }
 200
 201         soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
 202         if (!soc_dev_attr)
 203                 return NULL;
 204
 205         soc_dev_attr->family = soc->family;
 206         soc_dev_attr->soc_id = soc->name;
 207         soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%X",
 208                                            AT91_CIDR_VERSION(cidr));
 209         soc_dev = soc_device_register(soc_dev_attr);
 210         if (IS_ERR(soc_dev)) {
 211                 kfree(soc_dev_attr->revision);
 212                 kfree(soc_dev_attr);
 213                 pr_warn("Could not register SoC device\n");
 214                 return NULL;
 215         }
 216
 217         if (soc->family)
 218                 pr_info("Detected SoC family: %s\n", soc->family);
 219         pr_info("Detected SoC: %s, revision %X\n", soc->name,
 220                 AT91_CIDR_VERSION(cidr));
 221
 222         return soc_dev;
 223 }
 224
 225 static int __init atmel_soc_device_init(void)
 226 {
 227         at91_soc_init(socs);
 228
 229         return 0;
 230 }
 231 subsys_initcall(atmel_soc_device_init);