kernel: pci: Add command register helpers

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

3 files changed, 57 insertions, 0 deletions

diff --git a/sys/dev/pci/pci.c b/sys/dev/pci/pci.c
index 57133bf..c4383e6 100644
--- a/sys/dev/pci/pci.c
+++ b/sys/dev/pci/pci.c
@@ -212,6 +212,21 @@ pci_writel(struct pci_device *dev, uint32_t offset, uint32_t val)
     __builtin_unreachable();
 }
 
+/*
+ * Set command register bits.
+ *
+ * @dev: Device whose command register to modify.
+ * @bits: Bits to set.
+ */
+void
+pci_set_cmdreg(struct pci_device *dev, uint16_t bits)
+{
+    uint32_t tmp;
+
+    tmp = pci_readl(dev, 0x4) | bits;
+    pci_writel(dev, 0x4, tmp);
+}
+
 struct pci_device *
 pci_get_device(struct pci_lookup lookup, uint16_t lookup_type)
 {
diff --git a/sys/include/dev/pci/pci.h b/sys/include/dev/pci/pci.h
index fbbbeab..66ecb91 100644
--- a/sys/include/dev/pci/pci.h
+++ b/sys/include/dev/pci/pci.h
@@ -33,6 +33,7 @@
 #include <sys/syscall.h>
 #include <sys/queue.h>
 #include <sys/cdefs.h>
+#include <dev/pci/pciregs.h>
 
 /* Lookup bits */
 #define PCI_DEVICE_ID   __BIT(0)
@@ -66,6 +67,7 @@ struct pci_device {
 int pci_init(void);
 uint32_t pci_readl(struct pci_device *dev, uint32_t offset);
 void pci_writel(struct pci_device *dev, uint32_t offset, uint32_t val);
+void pci_set_cmdreg(struct pci_device *dev, uint16_t bits);
 struct pci_device *pci_get_device(struct pci_lookup lookup, uint16_t lookup_type);
 
 #endif  /* !_DEV_PCI_H_ */
diff --git a/sys/include/dev/pci/pciregs.h b/sys/include/dev/pci/pciregs.h
new file mode 100644
index 0000000..732e88c
--- /dev/null
+++ b/sys/include/dev/pci/pciregs.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
+ * 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 Hyra 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.
+ */
+
+#ifndef _PCIREGS_H_
+#define _PCIREGS_H_
+
+#include <sys/cdefs.h>
+
+/* PCI command register bits */
+#define PCI_IO_SPACE        __BIT(0)  /* Respond to I/O space accesses */
+#define PCI_MEM_SPACE       __BIT(1)  /* Respond to mem space accesses */
+#define PCI_BUS_MASTERING   __BIT(2)  /* Enable bus mastering */
+
+#endif  /* !_PCIREGS_H_ */