linux-kernel - [RFC PATCH 1/3] PCI: Add standard PCI Config Address macros

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Message-Id: <20220911112024.14304-2-pali@kernel.org>
Date:   Sun, 11 Sep 2022 13:20:22 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Sergio Paracuellos <sergio.paracuellos@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: [RFC PATCH 1/3] PCI: Add standard PCI Config Address macros

Lot of PCI and PCIe controllers are using standard Config Address for PCI
Configuration Mechanism #1 (as defined inPCI Local Bus Specification) or
its extended version.

So introduce new macros PCI_CONF1_ADDRESS() and PCI_CONF1_EXT_ADDRESS() in
new include file linux/pci-conf1.h which can be suitable for PCI and PCIe
controllers which uses this type of access to PCI config space.

Signed-off-by: Pali Rohár <pali@...nel.org>
---
 include/linux/pci-conf1.h | 51 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 include/linux/pci-conf1.h

diff --git a/include/linux/pci-conf1.h b/include/linux/pci-conf1.h
new file mode 100644
index 000000000000..12d2c581a67f
--- /dev/null
+++ b/include/linux/pci-conf1.h
@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/* Copyright 2022 Pali Rohár <pali@...nel.org> */
+#ifndef PCI_CONF1_H
+#define PCI_CONF1_H
+
+/*
+ * Config Address for PCI Configuration Mechanism #1
+ *
+ * See PCI Local Bus Specification, Revision 3.0,
+ * Section 3.2.2.3.2, Figure 3-2, p. 50.
+ */
+
+#define PCI_CONF1_BUS_SHIFT	16 /* Bus number */
+#define PCI_CONF1_DEV_SHIFT	11 /* Device number */
+#define PCI_CONF1_FUNC_SHIFT	8  /* Function number */
+
+#define PCI_CONF1_BUS_MASK	0xff
+#define PCI_CONF1_DEV_MASK	0x1f
+#define PCI_CONF1_FUNC_MASK	0x7
+#define PCI_CONF1_REG_MASK	0xfc /* Limit aligned offset to a maximum of 256B */
+
+#define PCI_CONF1_ENABLE	BIT(31)
+#define PCI_CONF1_BUS(x)	(((x) & PCI_CONF1_BUS_MASK) << PCI_CONF1_BUS_SHIFT)
+#define PCI_CONF1_DEV(x)	(((x) & PCI_CONF1_DEV_MASK) << PCI_CONF1_DEV_SHIFT)
+#define PCI_CONF1_FUNC(x)	(((x) & PCI_CONF1_FUNC_MASK) << PCI_CONF1_FUNC_SHIFT)
+#define PCI_CONF1_REG(x)	((x) & PCI_CONF1_REG_MASK)
+
+#define PCI_CONF1_ADDRESS(bus, dev, func, reg) \
+	(PCI_CONF1_ENABLE | \
+	 PCI_CONF1_BUS(bus) | \
+	 PCI_CONF1_DEV(dev) | \
+	 PCI_CONF1_FUNC(func) | \
+	 PCI_CONF1_REG(reg))
+
+/*
+ * Extension of PCI Config Address for accessing extended PCIe registers
+ *
+ * No standardized specification, but used on lot of non-ECAM-compliant ARM SoCs
+ * or on AMD Barcelona and new CPUs. Reserved bits [27:24] of PCI Config Address
+ * are used for specifying additional 4 high bits of PCI Express register.
+ */
+
+#define PCI_CONF1_EXT_REG_SHIFT	16
+#define PCI_CONF1_EXT_REG_MASK	0xf00
+#define PCI_CONF1_EXT_REG(x)	(((x) & PCI_CONF1_EXT_REG_MASK) << PCI_CONF1_EXT_REG_SHIFT)
+
+#define PCI_CONF1_EXT_ADDRESS(bus, dev, func, reg) \
+	(PCI_CONF1_ADDRESS(bus, dev, func, reg) | \
+	 PCI_CONF1_EXT_REG(reg))
+
+#endif
-- 
2.20.1