kern: io: Add initial PCI CAM driver

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 76 insertions, 0 deletions

diff --git a/src/sys/io/pci/pci.c b/src/sys/io/pci/pci.c
new file mode 100644
index 0000000..864e4c3
--- /dev/null
+++ b/src/sys/io/pci/pci.c
@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2025 Ian Marco Moffett and L5 engineers
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/cdefs.h>
+#include <sys/panic.h>
+#include <sys/syslog.h>
+#include <io/pci/pci.h>
+#include <io/pci/cam.h>
+
+static struct cam_hook cam;
+
+/*
+ * Read from a specific register
+ */
+pcireg_t
+pci_readl(struct pci_device *dp, pcireg_t reg)
+{
+    if (dp == NULL) {
+        return 0;
+    }
+
+    return cam.cam_readl(dp, reg);
+}
+
+/*
+ * Write to a specific register
+ */
+void
+pci_writel(struct pci_device *dp, pcireg_t reg, uint32_t v)
+{
+    if (dp == NULL) {
+        return;
+    }
+
+    return cam.cam_writel(dp, reg, v);
+}
+
+void
+pci_init_bus(void)
+{
+    int error;
+
+    error = pci_cam_init(&cam);
+    if (error < 0) {
+        printf("pci_init_bus: pci_cam_init() returned %d\n", error);
+        panic("pci_init_bus: failed to init CAM\n");
+    }
+}