summaryrefslogtreecommitdiffstats
path: root/grub-core/bus/fdt.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:29:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:29:51 +0000
commit6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e (patch)
tree32451fa3cdd9321fb2591fada9891b2cb70a9cd1 /grub-core/bus/fdt.c
parentInitial commit. (diff)
downloadgrub2-6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e.tar.xz
grub2-6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e.zip
Adding upstream version 2.06.upstream/2.06upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'grub-core/bus/fdt.c')
-rw-r--r--grub-core/bus/fdt.c256
1 files changed, 256 insertions, 0 deletions
diff --git a/grub-core/bus/fdt.c b/grub-core/bus/fdt.c
new file mode 100644
index 0000000..135da49
--- /dev/null
+++ b/grub-core/bus/fdt.c
@@ -0,0 +1,256 @@
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2016 Free Software Foundation, Inc.
+ *
+ * GRUB is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/fdtbus.h>
+#include <grub/fdt.h>
+#include <grub/term.h>
+
+static const void *dtb;
+static grub_size_t root_address_cells, root_size_cells;
+/* Pointer to this symbol signals invalid mapping. */
+char grub_fdtbus_invalid_mapping[1];
+
+struct grub_fdtbus_dev *devs;
+struct grub_fdtbus_driver *drivers;
+
+int
+grub_fdtbus_is_compatible (const char *compat_string,
+ const struct grub_fdtbus_dev *dev)
+{
+ grub_size_t compatible_size;
+ const char *compatible = grub_fdt_get_prop (dtb, dev->node, "compatible",
+ &compatible_size);
+ if (!compatible)
+ return 0;
+ const char *compatible_end = compatible + compatible_size;
+ while (compatible < compatible_end)
+ {
+ if (grub_strcmp (compat_string, compatible) == 0)
+ return 1;
+ compatible += grub_strlen (compatible) + 1;
+ }
+ return 0;
+}
+
+static void
+fdtbus_scan (struct grub_fdtbus_dev *parent)
+{
+ int node;
+ for (node = grub_fdt_first_node (dtb, parent ? parent->node : 0); node >= 0;
+ node = grub_fdt_next_node (dtb, node))
+ {
+ struct grub_fdtbus_dev *dev;
+ struct grub_fdtbus_driver *driver;
+ dev = grub_zalloc (sizeof (*dev));
+ if (!dev)
+ {
+ grub_print_error ();
+ return;
+ }
+ dev->node = node;
+ dev->next = devs;
+ dev->parent = parent;
+ devs = dev;
+ FOR_LIST_ELEMENTS(driver, drivers)
+ if (!dev->driver && grub_fdtbus_is_compatible (driver->compatible, dev))
+ {
+ grub_dprintf ("fdtbus", "Attaching %s\n", driver->compatible);
+ if (driver->attach (dev) == GRUB_ERR_NONE)
+ {
+ grub_dprintf ("fdtbus", "Attached %s\n", driver->compatible);
+ dev->driver = driver;
+ break;
+ }
+ grub_print_error ();
+ }
+ fdtbus_scan (dev);
+ }
+}
+
+void
+grub_fdtbus_register (struct grub_fdtbus_driver *driver)
+{
+ struct grub_fdtbus_dev *dev;
+ grub_dprintf ("fdtbus", "Registering %s\n", driver->compatible);
+ grub_list_push (GRUB_AS_LIST_P (&drivers),
+ GRUB_AS_LIST (driver));
+ for (dev = devs; dev; dev = dev->next)
+ if (!dev->driver && grub_fdtbus_is_compatible (driver->compatible, dev))
+ {
+ grub_dprintf ("fdtbus", "Attaching %s (%p)\n", driver->compatible, dev);
+ if (driver->attach (dev) == GRUB_ERR_NONE)
+ {
+ grub_dprintf ("fdtbus", "Attached %s\n", driver->compatible);
+ dev->driver = driver;
+ }
+ grub_print_error ();
+ }
+}
+
+void
+grub_fdtbus_unregister (struct grub_fdtbus_driver *driver)
+{
+ grub_list_remove (GRUB_AS_LIST (driver));
+ struct grub_fdtbus_dev *dev;
+ for (dev = devs; dev; dev = dev->next)
+ if (dev->driver == driver)
+ {
+ if (driver->detach)
+ driver->detach(dev);
+ dev->driver = 0;
+ }
+}
+
+void
+grub_fdtbus_init (const void *dtb_in, grub_size_t size)
+{
+ if (!dtb_in || grub_fdt_check_header (dtb_in, size) < 0)
+ grub_fatal ("invalid FDT");
+ dtb = dtb_in;
+ const grub_uint32_t *prop = grub_fdt_get_prop (dtb, 0, "#address-cells", 0);
+ if (prop)
+ root_address_cells = grub_be_to_cpu32 (*prop);
+ else
+ root_address_cells = 1;
+
+ prop = grub_fdt_get_prop (dtb, 0, "#size-cells", 0);
+ if (prop)
+ root_size_cells = grub_be_to_cpu32 (*prop);
+ else
+ root_size_cells = 1;
+
+ fdtbus_scan (0);
+}
+
+static int
+get_address_cells (const struct grub_fdtbus_dev *dev)
+{
+ const grub_uint32_t *prop;
+ if (!dev)
+ return root_address_cells;
+ prop = grub_fdt_get_prop (dtb, dev->node, "#address-cells", 0);
+ if (prop)
+ return grub_be_to_cpu32 (*prop);
+ return 1;
+}
+
+static int
+get_size_cells (const struct grub_fdtbus_dev *dev)
+{
+ const grub_uint32_t *prop;
+ if (!dev)
+ return root_size_cells;
+ prop = grub_fdt_get_prop (dtb, dev->node, "#size-cells", 0);
+ if (prop)
+ return grub_be_to_cpu32 (*prop);
+ return 1;
+}
+
+static grub_uint64_t
+get64 (const grub_uint32_t *reg, grub_size_t cells)
+{
+ grub_uint64_t val = 0;
+ if (cells >= 1)
+ val = grub_be_to_cpu32 (reg[cells - 1]);
+ if (cells >= 2)
+ val |= ((grub_uint64_t) grub_be_to_cpu32 (reg[cells - 2])) << 32;
+ return val;
+}
+
+static volatile void *
+translate (const struct grub_fdtbus_dev *dev, const grub_uint32_t *reg)
+{
+ volatile void *ret;
+ const grub_uint32_t *ranges;
+ grub_size_t ranges_size, cells_per_mapping;
+ grub_size_t parent_address_cells, child_address_cells, child_size_cells;
+ grub_size_t nmappings, i;
+ if (dev == 0)
+ {
+ grub_uint64_t val;
+ val = get64 (reg, root_address_cells);
+ if (sizeof (void *) == 4 && (val >> 32))
+ return grub_fdtbus_invalid_mapping;
+ return (void *) (grub_addr_t) val;
+ }
+ ranges = grub_fdt_get_prop (dtb, dev->node, "ranges", &ranges_size);
+ if (!ranges)
+ return grub_fdtbus_invalid_mapping;
+ if (ranges_size == 0)
+ return translate (dev->parent, reg);
+ parent_address_cells = get_address_cells (dev->parent);
+ child_address_cells = get_address_cells (dev);
+ child_size_cells = get_size_cells (dev);
+ cells_per_mapping = parent_address_cells + child_address_cells + child_size_cells;
+ nmappings = ranges_size / 4 / cells_per_mapping;
+ for (i = 0; i < nmappings; i++)
+ {
+ const grub_uint32_t *child_addr = &ranges[i * cells_per_mapping];
+ const grub_uint32_t *parent_addr = child_addr + child_address_cells;
+ grub_uint64_t child_size = get64 (parent_addr + parent_address_cells, child_size_cells);
+
+ if (child_address_cells > 2 && grub_memcmp (reg, child_addr, (child_address_cells - 2) * 4) != 0)
+ continue;
+ if (get64 (reg, child_address_cells) < get64 (child_addr, child_address_cells))
+ continue;
+
+ grub_uint64_t offset = get64 (reg, child_address_cells) - get64 (child_addr, child_address_cells);
+ if (offset >= child_size)
+ continue;
+
+ ret = translate (dev->parent, parent_addr);
+ if (grub_fdtbus_is_mapping_valid (ret))
+ ret = (volatile char *) ret + offset;
+ return ret;
+ }
+ return grub_fdtbus_invalid_mapping;
+}
+
+volatile void *
+grub_fdtbus_map_reg (const struct grub_fdtbus_dev *dev, int regno, grub_size_t *size)
+{
+ grub_size_t address_cells, size_cells;
+ address_cells = get_address_cells (dev->parent);
+ size_cells = get_size_cells (dev->parent);
+ const grub_uint32_t *reg = grub_fdt_get_prop (dtb, dev->node, "reg", 0);
+ if (size && size_cells)
+ *size = reg[(address_cells + size_cells) * regno + address_cells];
+ if (size && !size_cells)
+ *size = 0;
+ return translate (dev->parent, reg + (address_cells + size_cells) * regno);
+}
+
+const char *
+grub_fdtbus_get_name (const struct grub_fdtbus_dev *dev)
+{
+ return grub_fdt_get_nodename (dtb, dev->node);
+}
+
+const void *
+grub_fdtbus_get_prop (const struct grub_fdtbus_dev *dev,
+ const char *name,
+ grub_uint32_t *len)
+{
+ return grub_fdt_get_prop (dtb, dev->node, name, len);
+}
+
+const void *
+grub_fdtbus_get_fdt (void)
+{
+ return dtb;
+}