Changes in uspace/drv/bus/isa/isa.c [3d0fd0d:832cbe7] in mainline

File:

• uspace/drv/bus/isa/isa.c (modified) (7 diffs)

uspace/drv/bus/isa/isa.c

@@ -1 +1 @@
 /*
- * Copyright (c) 2018 Jiri Svoboda
+ * Copyright (c) 2025 Jiri Svoboda
  * Copyright (c) 2010 Lenka Trochtova
  * Copyright (c) 2011 Jan Vesely
@@ -72 +72 @@
 #define EBUS_CHILD_FUN_CONF_PATH "/drv/isa/ebus.dev"
 
-#define ISA_MAX_HW_RES 5
+#define ISA_MAX_HW_RES 6
 
 typedef struct {
         fibril_mutex_t mutex;
+        bool pci_isa_bridge;
         uint16_t pci_vendor_id;
         uint16_t pci_device_id;
@@ -92 +93 @@
         hw_resource_list_t hw_resources;
         link_t bus_link;
+        isa_bus_t *bus;
 } isa_fun_t;
 
@@ -204 +206 @@
 }
 
+/** Handle legacy IO availability query from function.
+ *
+ * @param fnode Function performing the query
+ * @param rclaims Place to store the legacy IO claims bitmask
+ * @return EOK on success or an error code
+ */
+static errno_t isa_fun_query_legacy_io(ddf_fun_t *fnode,
+    hw_res_claims_t *rclaims)
+{
+        isa_fun_t *fun = isa_fun(fnode);
+        hw_res_claims_t claims;
+        async_sess_t *sess;
+        errno_t rc;
+
+        ddf_msg(LVL_DEBUG, "isa_fun_query_legacy_io()");
+
+        sess = ddf_dev_parent_sess_get(fun->bus->dev);
+        if (sess == NULL) {
+                ddf_msg(LVL_ERROR, "isa_dev_add failed to connect to the "
+                    "parent driver.");
+                return ENOENT;
+        }
+
+        if (!fun->bus->pci_isa_bridge) {
+                ddf_msg(LVL_NOTE, "isa_fun_query_legacy_io: classic ISA - "
+                    "legacy IDE range is available");
+                /* Classic ISA, we can be sure IDE is unclaimed by PCI */
+                claims = 0;
+        } else {
+                ddf_msg(LVL_NOTE, "isa_fun_query_legacy_io: ISA bridge - "
+                    "determine legacy IDE availability from PCI bus driver");
+                rc = hw_res_query_legacy_io(sess, &claims);
+                if (rc != EOK) {
+                        ddf_msg(LVL_NOTE, "Error querying legacy IO claims.");
+                        return rc;
+                }
+        }
+
+        ddf_msg(LVL_DEBUG, "isa_fun_query_legacy_io: returning 0x%x", claims);
+        *rclaims = claims;
+        return EOK;
+}
+
 static hw_res_ops_t isa_fun_hw_res_ops = {
         .get_resource_list = isa_fun_get_resources,
@@ -211 +256 @@
         .dma_channel_setup = isa_fun_setup_dma,
         .dma_channel_remain = isa_fun_remain_dma,
+        .query_legacy_io = isa_fun_query_legacy_io
 };
 
@@ -264 +310 @@
         fibril_mutex_initialize(&fun->mutex);
         fun->hw_resources.resources = fun->resources;
+        fun->bus = isa;
 
         fun->fnode = fnode;
@@ -743 +790 @@
         if (rc != EOK) {
                 ddf_msg(LVL_NOTE, "Cannot read PCI config. Assuming ISA classic.");
+                isa->pci_isa_bridge = false;
                 isa->pci_vendor_id = 0;
                 isa->pci_device_id = 0;
                 isa->pci_class = BASE_CLASS_BRIDGE;
                 isa->pci_subclass = SUB_CLASS_BRIDGE_ISA;
+        } else {
+                ddf_msg(LVL_NOTE, "ISA Bridge");
+                isa->pci_isa_bridge = true;
         }