bus: mvebu-mbus: Add static window allocation to the DT binding

This patch adds static window allocation to the device tree binding.
Each first-child of the mbus-compatible node, with a suitable 'ranges'
property, declaring an address translation, will trigger an address
decoding window allocation.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Tested-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

1 files changed, 126 insertions, 1 deletions

diff --git a/drivers/bus/mvebu-mbus.c b/drivers/bus/mvebu-mbus.c
index 44a07c4ee4ea..78b8c0436f0b 100644
--- a/drivers/bus/mvebu-mbus.c
+++ b/drivers/bus/mvebu-mbus.c
@@ -902,6 +902,127 @@ int __init mvebu_mbus_init(const char *soc, phys_addr_t mbuswins_phys_base,
 }
 
 #ifdef CONFIG_OF
+/*
+ * The window IDs in the ranges DT property have the following format:
+ *  - bits 28 to 31: MBus custom field
+ *  - bits 24 to 27: window target ID
+ *  - bits 16 to 23: window attribute ID
+ *  - bits  0 to 15: unused
+ */
+#define CUSTOM(id) (((id) & 0xF0000000) >> 24)
+#define TARGET(id) (((id) & 0x0F000000) >> 24)
+#define ATTR(id)   (((id) & 0x00FF0000) >> 16)
+
+static int __init mbus_dt_setup_win(struct mvebu_mbus_state *mbus,
+                                    u32 base, u32 size,
+                                    u8 target, u8 attr)
+{
+        const struct mvebu_mbus_mapping *map = mbus->soc->map;
+        const char *name;
+        int i;
+
+        /* Search for a suitable window in the existing mappings */
+        for (i = 0; map[i].name; i++)
+                if (map[i].target == target &&
+                    map[i].attr == (attr & map[i].attrmask))
+                        break;
+
+        name = map[i].name;
+        if (!name) {
+                pr_err("window 0x%x:0x%x is unknown, skipping\n",
+                       target, attr);
+                return -EINVAL;
+        }
+
+        if (!mvebu_mbus_window_conflicts(mbus, base, size, target, attr)) {
+                pr_err("cannot add window '%s', conflicts with another window\n",
+                       name);
+                return -EBUSY;
+        }
+
+        if (mvebu_mbus_alloc_window(mbus, base, size, MVEBU_MBUS_NO_REMAP,
+                                    target, attr)) {
+                pr_err("cannot add window '%s', too many windows\n",
+                       name);
+                return -ENOMEM;
+        }
+        return 0;
+}
+
+static int __init
+mbus_parse_ranges(struct device_node *node,
+                  int *addr_cells, int *c_addr_cells, int *c_size_cells,
+                  int *cell_count, const __be32 **ranges_start,
+                  const __be32 **ranges_end)
+{
+        const __be32 *prop;
+        int ranges_len, tuple_len;
+
+        /* Allow a node with no 'ranges' property */
+        *ranges_start = of_get_property(node, "ranges", &ranges_len);
+        if (*ranges_start == NULL) {
+                *addr_cells = *c_addr_cells = *c_size_cells = *cell_count = 0;
+                *ranges_start = *ranges_end = NULL;
+                return 0;
+        }
+        *ranges_end = *ranges_start + ranges_len / sizeof(__be32);
+
+        *addr_cells = of_n_addr_cells(node);
+
+        prop = of_get_property(node, "#address-cells", NULL);
+        *c_addr_cells = be32_to_cpup(prop);
+
+        prop = of_get_property(node, "#size-cells", NULL);
+        *c_size_cells = be32_to_cpup(prop);
+
+        *cell_count = *addr_cells + *c_addr_cells + *c_size_cells;
+        tuple_len = (*cell_count) * sizeof(__be32);
+
+        if (ranges_len % tuple_len) {
+                pr_warn("malformed ranges entry '%s'\n", node->name);
+                return -EINVAL;
+        }
+        return 0;
+}
+
+static int __init mbus_dt_setup(struct mvebu_mbus_state *mbus,
+                                struct device_node *np)
+{
+        int addr_cells, c_addr_cells, c_size_cells;
+        int i, ret, cell_count;
+        const __be32 *r, *ranges_start, *ranges_end;
+
+        ret = mbus_parse_ranges(np, &addr_cells, &c_addr_cells,
+                                &c_size_cells, &cell_count,
+                                &ranges_start, &ranges_end);
+        if (ret < 0)
+                return ret;
+
+        for (i = 0, r = ranges_start; r < ranges_end; r += cell_count, i++) {
+                u32 windowid, base, size;
+                u8 target, attr;
+
+                /*
+                 * An entry with a non-zero custom field do not
+                 * correspond to a static window, so skip it.
+                 */
+                windowid = of_read_number(r, 1);
+                if (CUSTOM(windowid))
+                        continue;
+
+                target = TARGET(windowid);
+                attr = ATTR(windowid);
+
+                base = of_read_number(r + c_addr_cells, addr_cells);
+                size = of_read_number(r + c_addr_cells + addr_cells,
+                                      c_size_cells);
+                ret = mbus_dt_setup_win(mbus, base, size, target, attr);
+                if (ret < 0)
+                        return ret;
+        }
+        return 0;
+}
+
 int __init mvebu_mbus_dt_init(void)
 {
         struct resource mbuswins_res, sdramwins_res;
@@ -946,6 +1067,10 @@ int __init mvebu_mbus_dt_init(void)
                                      resource_size(&mbuswins_res),
                                      sdramwins_res.start,
                                      resource_size(&sdramwins_res));
-        return ret;
+        if (ret)
+                return ret;
+
+        /* Setup statically declared windows in the DT */
+        return mbus_dt_setup(&mbus_state, np);
 }
 #endif