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Date: Fri, 18 Mar 2016 01:48:30 +0530
From: Jayachandran C <jchandra@...adcom.com>
To: Bjorn Helgaas <helgaas@...nel.org>,
Tomasz Nowicki <tn@...ihalf.com>, rafael@...nel.org
Cc: Jayachandran C <jchandra@...adcom.com>,
Arnd Bergmann <arnd@...db.de>,
Will Deacon <will.deacon@....com>,
Catalin Marinas <catalin.marinas@....com>,
Hanjun Guo <hanjun.guo@...aro.org>,
Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
okaya@...eaurora.org, jiang.liu@...ux.intel.com,
Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
robert.richter@...iumnetworks.com, Marcin Wojtas <mw@...ihalf.com>,
Liviu.Dudau@....com, David Daney <ddaney@...iumnetworks.com>,
wangyijing@...wei.com, Suravee.Suthikulpanit@....com,
msalter@...hat.com, linux-pci@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-acpi@...r.kernel.org,
linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org,
Jon Masters <jcm@...hat.com>
Subject: [RFC PATCH 1/4] PCI: Provide generic ECAM mapping functions
Add config option PCI_GENERIC_ECAM and file drivers/pci/ecam.c to
provide generic functions to access memory mapped PCI config space.
The API defines 'struct pci_config_window' to hold the mappings.
The function pci_generic_map_config() is provided to allocate the
struct, request the memory region, and do the ioremap() calls
needed to setup the mapping. pci_generic_unmap_config() is provided
to delete a mapping.
A helper function pci_generic_map_bus() is also provided to be used
to implement pci_ops map_bus method.
Signed-off-by: Jayachandran C <jchandra@...adcom.com>
---
drivers/pci/Kconfig | 3 ++
drivers/pci/Makefile | 2 +
drivers/pci/ecam.c | 127 +++++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/pci.h | 10 ++++
4 files changed, 142 insertions(+)
create mode 100644 drivers/pci/ecam.c
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index 209292e..e930d62 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -83,6 +83,9 @@ config HT_IRQ
config PCI_ATS
bool
+config PCI_GENERIC_ECAM
+ bool
+
config PCI_IOV
bool "PCI IOV support"
depends on PCI
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index 2154092..810aec8 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -55,6 +55,8 @@ obj-$(CONFIG_PCI_SYSCALL) += syscall.o
obj-$(CONFIG_PCI_STUB) += pci-stub.o
+obj-$(CONFIG_PCI_GENERIC_ECAM) += ecam.o
+
obj-$(CONFIG_XEN_PCIDEV_FRONTEND) += xen-pcifront.o
obj-$(CONFIG_OF) += of.o
diff --git a/drivers/pci/ecam.c b/drivers/pci/ecam.c
new file mode 100644
index 0000000..6a63901
--- /dev/null
+++ b/drivers/pci/ecam.c
@@ -0,0 +1,127 @@
+/*
+ * Copyright 2016 Broadcom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation (the "GPL").
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License version 2 (GPLv2) for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 (GPLv2) along with this source code.
+ */
+
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+
+/*
+ * On 64 bit systems, we do a single ioremap for the whole config space
+ * since we have enough virtual address range available. On 32 bit, do an
+ * ioremap per bus.
+ */
+static const bool per_bus_mapping = !config_enabled(CONFIG_64BIT);
+
+/*
+ * struct to hold the mappings of a config space window. This
+ * will be allocated with enough entries in win[] to hold all
+ * the mappings for the bus range.
+ */
+struct pci_config_window {
+ phys_addr_t cfgaddr;
+ u8 bus_start;
+ u8 bus_end;
+ u8 bus_shift;
+ u8 devfn_shift;
+ void __iomem *win[0];
+};
+
+/*
+ * helper function provided to implement the pci_ops ->map_bus method
+ */
+void __iomem *pci_generic_map_bus(struct pci_config_window *cfg,
+ unsigned int busn, unsigned int devfn, int where)
+{
+ void __iomem *base;
+
+ if (busn < cfg->bus_start || busn > cfg->bus_end)
+ return NULL;
+
+ busn -= cfg->bus_start;
+ if (per_bus_mapping)
+ base = cfg->win[busn];
+ else
+ base = cfg->win[0] + (busn << cfg->bus_shift);
+ return base + (devfn << cfg->devfn_shift) + where;
+}
+
+/*
+ * Create a PCI config space window
+ * - reserve mem region
+ * - alloc struct pci_config_window with space for all mappings
+ * - ioremap the config space
+ */
+struct pci_config_window *pci_generic_map_config(phys_addr_t addr,
+ u8 bus_start, u8 bus_end, u8 bus_shift, u8 devfn_shift)
+{
+ struct pci_config_window *cfg;
+ unsigned int bus_range, bsz, mapsz;
+ int i, nidx;
+
+ if (bus_end < bus_start)
+ return ERR_PTR(-EINVAL);
+
+ bus_range = bus_end - bus_start + 1;
+ bsz = 1 << bus_shift;
+ nidx = per_bus_mapping ? bus_range : 1;
+ mapsz = per_bus_mapping ? bsz : bus_range * bsz;
+ cfg = kzalloc(sizeof(*cfg) + nidx * sizeof(cfg->win[0]), GFP_KERNEL);
+ if (!cfg)
+ return ERR_PTR(-ENOMEM);
+
+ cfg->bus_start = bus_start;
+ cfg->bus_end = bus_end;
+ cfg->bus_shift = bus_shift;
+ cfg->devfn_shift = devfn_shift;
+
+ if (!request_mem_region(addr, bus_range * bsz, "Configuration Space"))
+ goto err_exit;
+
+ /* cfgaddr has to be set after request_mem_region */
+ cfg->cfgaddr = addr;
+
+ for (i = 0; i < nidx; i++) {
+ cfg->win[i] = ioremap(addr + i * mapsz, mapsz);
+ if (!cfg->win[i])
+ goto err_exit;
+ }
+ return cfg;
+
+err_exit:
+ pci_generic_unmap_config(cfg);
+ return ERR_PTR(-ENOMEM);
+}
+
+/*
+ * Free a config space mapping
+ */
+void pci_generic_unmap_config(struct pci_config_window *cfg)
+{
+ unsigned int bus_range;
+ int i, nidx;
+
+ bus_range = cfg->bus_end - cfg->bus_start + 1;
+ nidx = per_bus_mapping ? bus_range : 1;
+ for (i = 0; i < nidx; i++)
+ if (cfg->win[i])
+ iounmap(cfg->win[i]);
+ if (cfg->cfgaddr)
+ release_mem_region(cfg->cfgaddr, bus_range << cfg->bus_shift);
+ kfree(cfg);
+}
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 3df9e37..33c46bc 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -2013,6 +2013,16 @@ static inline bool pci_ari_enabled(struct pci_bus *bus)
return bus->self && bus->self->ari_enabled;
}
+/* Generic ECAM mapping API */
+#ifdef CONFIG_PCI_GENERIC_ECAM
+struct pci_config_window;
+void __iomem *pci_generic_map_bus(struct pci_config_window *cfg,
+ unsigned int busn, unsigned int devfn, int where);
+struct pci_config_window *pci_generic_map_config(phys_addr_t addr,
+ u8 bus_start, u8 bus_end, u8 bus_shift, u8 devfn_shift);
+void pci_generic_unmap_config(struct pci_config_window *cfg);
+#endif
+
/* provide the legacy pci_dma_* API */
#include <linux/pci-dma-compat.h>
--
1.9.1
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