linux-kernel - [PATCHv2] PCI: QDF2432 32 bit config space accessors

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Date:   Wed, 21 Sep 2016 18:38:05 -0400
From:   Christopher Covington <cov@...eaurora.org>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Sinan Kaya <okaya@...eaurora.org>,
        Tomasz Nowicki <tn@...ihalf.com>, will.deacon@....com,
        catalin.marinas@....com, rafael@...nel.org,
        Lorenzo.Pieralisi@....com, arnd@...db.de, hanjun.guo@...aro.org,
        jchandra@...adcom.com, dhdang@....com, ard.biesheuvel@...aro.org,
        robert.richter@...iumnetworks.com, mw@...ihalf.com,
        Liviu.Dudau@....com, ddaney@...iumnetworks.com,
        wangyijing@...wei.com, msalter@...hat.com,
        linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linaro-acpi@...ts.linaro.org, jcm@...hat.com,
        andrea.gallo@...aro.org, jeremy.linton@....com,
        liudongdong3@...wei.com, gabriele.paoloni@...wei.com,
        jhugo@...eaurora.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Christopher Covington <cov@...eaurora.org>
Subject: [PATCHv2] PCI: QDF2432 32 bit config space accessors

The Qualcomm Technologies QDF2432 SoC does not support accesses smaller
than 32 bits to the PCI configuration space. Register the appropriate
quirk.

Signed-off-by: Christopher Covington <cov@...eaurora.org>
---
 drivers/acpi/pci_mcfg.c  |  8 ++++++++
 drivers/pci/ecam.c       | 10 ++++++++++
 include/linux/pci-ecam.h |  1 +
 3 files changed, 19 insertions(+)

diff --git a/drivers/acpi/pci_mcfg.c b/drivers/acpi/pci_mcfg.c
index 245b79f..212334f 100644
--- a/drivers/acpi/pci_mcfg.c
+++ b/drivers/acpi/pci_mcfg.c
@@ -96,6 +96,14 @@ static struct mcfg_fixup mcfg_quirks[] = {
 	THUNDER_ECAM_MCFG(2, 12),
 	THUNDER_ECAM_MCFG(2, 13),
 #endif
+	{ "QCOM  ", "QDF2432 ", 1, 0, MCFG_BUS_ANY, &pci_32b_ops },
+	{ "QCOM  ", "QDF2432 ", 1, 1, MCFG_BUS_ANY, &pci_32b_ops },
+	{ "QCOM  ", "QDF2432 ", 1, 2, MCFG_BUS_ANY, &pci_32b_ops },
+	{ "QCOM  ", "QDF2432 ", 1, 3, MCFG_BUS_ANY, &pci_32b_ops },
+	{ "QCOM  ", "QDF2432 ", 1, 4, MCFG_BUS_ANY, &pci_32b_ops },
+	{ "QCOM  ", "QDF2432 ", 1, 5, MCFG_BUS_ANY, &pci_32b_ops },
+	{ "QCOM  ", "QDF2432 ", 1, 6, MCFG_BUS_ANY, &pci_32b_ops },
+	{ "QCOM  ", "QDF2432 ", 1, 7, MCFG_BUS_ANY, &pci_32b_ops },
 };
 
 static char mcfg_oem_id[ACPI_OEM_ID_SIZE];
diff --git a/drivers/pci/ecam.c b/drivers/pci/ecam.c
index 43ed08d..c3b3063 100644
--- a/drivers/pci/ecam.c
+++ b/drivers/pci/ecam.c
@@ -162,3 +162,13 @@ struct pci_ecam_ops pci_generic_ecam_ops = {
 		.write		= pci_generic_config_write,
 	}
 };
+
+/* ops for 32 bit config space access quirk */
+struct pci_ecam_ops pci_32b_ops = {
+	.bus_shift	= 20,
+	.pci_ops	= {
+		.map_bus	= pci_ecam_map_bus,
+		.read		= pci_generic_config_read32,
+		.write		= pci_generic_config_write32,
+	}
+};
diff --git a/include/linux/pci-ecam.h b/include/linux/pci-ecam.h
index 35f0e81..a6cffb8 100644
--- a/include/linux/pci-ecam.h
+++ b/include/linux/pci-ecam.h
@@ -65,6 +65,7 @@ extern struct pci_ecam_ops pci_thunder_pem_ops;
 #ifdef CONFIG_PCI_HOST_THUNDER_ECAM
 extern struct pci_ecam_ops pci_thunder_ecam_ops;
 #endif
+extern struct pci_ecam_ops pci_32b_ops;
 
 #ifdef CONFIG_PCI_HOST_GENERIC
 /* for DT-based PCI controllers that support ECAM */
-- 
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm
Technologies, Inc. Qualcomm Technologies, Inc. is a member of the Code Aurora
Forum, a Linux Foundation Collaborative Project.