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[src/trunk]: src/sys/arch/arm/pci arm: PCI: Add support for Arm PCI Config Sp...
details: https://anonhg.NetBSD.org/src/rev/ba6f0f661052
branches: trunk
changeset: 1022796:ba6f0f661052
user: jmcneill <jmcneill%NetBSD.org@localhost>
date: Sat Aug 07 21:23:37 2021 +0000
description:
arm: PCI: Add support for Arm PCI Config Space Access Firmware Interface
This adds basic support for the PCI Config Access interface defined in
Arm DEN0115.
diffstat:
sys/arch/arm/pci/files.pci | 6 +-
sys/arch/arm/pci/pci_smccc.c | 122 +++++++++++++++++++++++++++++++++++++++++++
sys/arch/arm/pci/pci_smccc.h | 45 +++++++++++++++
3 files changed, 172 insertions(+), 1 deletions(-)
diffs (188 lines):
diff -r c28538fa5ccc -r ba6f0f661052 sys/arch/arm/pci/files.pci
--- a/sys/arch/arm/pci/files.pci Sat Aug 07 21:21:49 2021 +0000
+++ b/sys/arch/arm/pci/files.pci Sat Aug 07 21:23:37 2021 +0000
@@ -1,4 +1,8 @@
-# $NetBSD: files.pci,v 1.1 2018/10/21 00:42:06 jmcneill Exp $
+# $NetBSD: files.pci,v 1.2 2021/08/07 21:23:37 jmcneill Exp $
# PCI MSI/MSI-X support
file arch/arm/pci/pci_msi_machdep.c pci & __have_pci_msi_msix
+
+# Arm PCI Configuration Space Access Firmware Interface (DEN0115)
+defflag opt_pci.h PCI_SMCCC
+file arch/arm/pci/pci_smccc.c pci_smccc
diff -r c28538fa5ccc -r ba6f0f661052 sys/arch/arm/pci/pci_smccc.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/arm/pci/pci_smccc.c Sat Aug 07 21:23:37 2021 +0000
@@ -0,0 +1,122 @@
+/* $NetBSD: pci_smccc.c,v 1.1 2021/08/07 21:23:37 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2021 Jared McNeill <jmcneill%invisible.ca@localhost>
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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/cdefs.h>
+__KERNEL_RCSID(0, "$NetBSD: pci_smccc.c,v 1.1 2021/08/07 21:23:37 jmcneill Exp $");
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+
+#include <arm/arm/smccc.h>
+#include <arm/pci/pci_smccc.h>
+
+/* Minimum SMCCC version required for PCI_VERSION call. */
+#define SMCCC_VERSION_1_1 0x10001
+
+/* PCI Configuration Space Access ABI functions */
+#define PCI_VERSION 0x84000130
+#define PCI_FEATURES 0x84000131
+#define PCI_READ 0x84000132
+#define PCI_WRITE 0x84000133
+#define PCI_GET_SEG_INFO 0x84000134
+#define GET_SEG_INFO_BUS_START __BITS(7,0)
+#define GET_SEG_INFO_BUS_END __BITS(15,8)
+
+static int
+pci_smccc_call(uint32_t fid,
+ register_t arg1, register_t arg2, register_t arg3, register_t arg4,
+ register_t *res0, register_t *res1, register_t *res2, register_t *res3)
+{
+ static int smccc_ver;
+
+ if (smccc_ver == 0) {
+ smccc_ver = smccc_version();
+ }
+ if (smccc_ver < SMCCC_VERSION_1_1) {
+ return SMCCC_NOT_SUPPORTED;
+ }
+
+ return smccc_call(fid, arg1, arg2, arg3, arg4,
+ res0, res1, res2, res3);
+}
+
+int
+pci_smccc_version(void)
+{
+ return pci_smccc_call(PCI_VERSION, 0, 0, 0, 0,
+ NULL, NULL, NULL, NULL);
+}
+
+int
+pci_smccc_features(uint32_t fid)
+{
+ return pci_smccc_call(PCI_FEATURES, fid, 0, 0, 0,
+ NULL, NULL, NULL, NULL);
+}
+
+int
+pci_smccc_read(uint32_t sbdf, uint32_t offset, uint32_t access_size,
+ uint32_t *data)
+{
+ register_t value;
+ int status;
+
+ status = pci_smccc_call(PCI_READ, sbdf, offset, access_size, 0,
+ NULL, &value, NULL, NULL);
+ if (status == SMCCC_SUCCESS) {
+ *data = value;
+ }
+
+ return status;
+}
+
+int
+pci_smccc_write(uint32_t sbdf, uint32_t offset, uint32_t access_size,
+ uint32_t data)
+{
+ return pci_smccc_call(PCI_WRITE, sbdf, offset, access_size, data,
+ NULL, NULL, NULL, NULL);
+}
+
+int
+pci_smccc_get_seg_info(uint16_t seg, uint8_t *bus_start, uint8_t *bus_end,
+ uint16_t *next_seg)
+{
+ register_t res1, res2;
+ int status;
+
+ status = pci_smccc_call(PCI_GET_SEG_INFO, seg, 0, 0, 0,
+ NULL, &res1, &res2, NULL);
+ if (status == SMCCC_SUCCESS) {
+ *bus_start = __SHIFTOUT(res1, GET_SEG_INFO_BUS_START);
+ *bus_end = __SHIFTOUT(res1, GET_SEG_INFO_BUS_END);
+ *next_seg = (uint16_t)res2;
+ }
+
+ return status;
+}
diff -r c28538fa5ccc -r ba6f0f661052 sys/arch/arm/pci/pci_smccc.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/arm/pci/pci_smccc.h Sat Aug 07 21:23:37 2021 +0000
@@ -0,0 +1,45 @@
+/* $NetBSD: pci_smccc.h,v 1.1 2021/08/07 21:23:37 jmcneill Exp $ */
+
+/*-
+ * Copyright (c) 2021 Jared McNeill <jmcneill%invisible.ca@localhost>
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 _PCI_SMCCC_H
+#define _PCI_SMCCC_H
+
+#define PCI_SMCCC_SUCCESS(_r) (((_r) & 0x80000000) == 0)
+
+#define PCI_SMCCC_SBDF(s, b, d, f) \
+ (((unsigned)(s) << 16) | ((b) << 8) | ((d) << 3) | (f))
+
+#define PCI_SMCCC_ACCESS_32BIT 4
+
+int pci_smccc_version(void);
+int pci_smccc_features(uint32_t);
+int pci_smccc_read(uint32_t, uint32_t, uint32_t, uint32_t *);
+int pci_smccc_write(uint32_t, uint32_t, uint32_t, uint32_t);
+int pci_smccc_get_seg_info(uint16_t, uint8_t *, uint8_t *, uint16_t *);
+
+#endif /* !_PCI_SMCCC_H */
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