mirror of https://gitee.com/openkylin/linux.git
Merge branch 'pci/host-generic' into next
* pci/host-generic: MAINTAINERS: Add generic PCI host controller driver PCI: generic: Add generic PCI host controller driver Conflicts: drivers/pci/host/Kconfig drivers/pci/host/Makefile
This commit is contained in:
Bjorn Helgaas
commit
d785260e2f
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|
@ -0,0 +1,100 @@
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|||
* Generic PCI host controller
|
||||
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||||
Firmware-initialised PCI host controllers and PCI emulations, such as the
|
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virtio-pci implementations found in kvmtool and other para-virtualised
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systems, do not require driver support for complexities such as regulator
|
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and clock management. In fact, the controller may not even require the
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||||
configuration of a control interface by the operating system, instead
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presenting a set of fixed windows describing a subset of IO, Memory and
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Configuration Spaces.
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Such a controller can be described purely in terms of the standardized device
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tree bindings communicated in pci.txt:
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Properties of the host controller node:
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- compatible : Must be "pci-host-cam-generic" or "pci-host-ecam-generic"
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depending on the layout of configuration space (CAM vs
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ECAM respectively).
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- device_type : Must be "pci".
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- ranges : As described in IEEE Std 1275-1994, but must provide
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at least a definition of non-prefetchable memory. One
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or both of prefetchable Memory and IO Space may also
|
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be provided.
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- bus-range : Optional property (also described in IEEE Std 1275-1994)
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to indicate the range of bus numbers for this controller.
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If absent, defaults to <0 255> (i.e. all buses).
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- #address-cells : Must be 3.
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- #size-cells : Must be 2.
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- reg : The Configuration Space base address and size, as accessed
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from the parent bus.
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Properties of the /chosen node:
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- linux,pci-probe-only
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: Optional property which takes a single-cell argument.
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If '0', then Linux will assign devices in its usual manner,
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otherwise it will not try to assign devices and instead use
|
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them as they are configured already.
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Configuration Space is assumed to be memory-mapped (as opposed to being
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accessed via an ioport) and laid out with a direct correspondence to the
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geography of a PCI bus address by concatenating the various components to
|
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form an offset.
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For CAM, this 24-bit offset is:
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cfg_offset(bus, device, function, register) =
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bus << 16 | device << 11 | function << 8 | register
|
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Whilst ECAM extends this by 4 bits to accomodate 4k of function space:
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cfg_offset(bus, device, function, register) =
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bus << 20 | device << 15 | function << 12 | register
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Interrupt mapping is exactly as described in `Open Firmware Recommended
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Practice: Interrupt Mapping' and requires the following properties:
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|
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- #interrupt-cells : Must be 1
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- interrupt-map : <see aforementioned specification>
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- interrupt-map-mask : <see aforementioned specification>
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Example:
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pci {
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compatible = "pci-host-cam-generic"
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device_type = "pci";
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#address-cells = <3>;
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#size-cells = <2>;
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bus-range = <0x0 0x1>;
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// CPU_PHYSICAL(2) SIZE(2)
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reg = <0x0 0x40000000 0x0 0x1000000>;
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// BUS_ADDRESS(3) CPU_PHYSICAL(2) SIZE(2)
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ranges = <0x01000000 0x0 0x01000000 0x0 0x01000000 0x0 0x00010000>,
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<0x02000000 0x0 0x41000000 0x0 0x41000000 0x0 0x3f000000>;
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#interrupt-cells = <0x1>;
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// PCI_DEVICE(3) INT#(1) CONTROLLER(PHANDLE) CONTROLLER_DATA(3)
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interrupt-map = < 0x0 0x0 0x0 0x1 &gic 0x0 0x4 0x1
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0x800 0x0 0x0 0x1 &gic 0x0 0x5 0x1
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0x1000 0x0 0x0 0x1 &gic 0x0 0x6 0x1
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0x1800 0x0 0x0 0x1 &gic 0x0 0x7 0x1>;
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// PCI_DEVICE(3) INT#(1)
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interrupt-map-mask = <0xf800 0x0 0x0 0x7>;
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}
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|
|
@ -6741,6 +6741,14 @@ L: linux-pci@vger.kernel.org
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S: Maintained
|
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F: drivers/pci/host/*designware*
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PCI DRIVER FOR GENERIC OF HOSTS
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M: Will Deacon <will.deacon@arm.com>
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L: linux-pci@vger.kernel.org
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L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
|
||||
S: Maintained
|
||||
F: Documentation/devicetree/bindings/pci/host-generic-pci.txt
|
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F: drivers/pci/host/pci-host-generic.c
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|
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PCMCIA SUBSYSTEM
|
||||
P: Linux PCMCIA Team
|
||||
L: linux-pcmcia@lists.infradead.org
|
||||
|
|
|
|||
|
|
@ -39,4 +39,11 @@ config PCI_RCAR_GEN2_PCIE
|
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help
|
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Say Y here if you want PCIe controller support on R-Car Gen2 SoCs.
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config PCI_HOST_GENERIC
|
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bool "Generic PCI host controller"
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depends on ARM && OF
|
||||
help
|
||||
Say Y here if you want to support a simple generic PCI host
|
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controller, such as the one emulated by kvmtool.
|
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|
||||
endmenu
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|
|
|
|||
|
|
@ -5,3 +5,4 @@ obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
|
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obj-$(CONFIG_PCI_TEGRA) += pci-tegra.o
|
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obj-$(CONFIG_PCI_RCAR_GEN2) += pci-rcar-gen2.o
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obj-$(CONFIG_PCI_RCAR_GEN2_PCIE) += pcie-rcar.o
|
||||
obj-$(CONFIG_PCI_HOST_GENERIC) += pci-host-generic.o
|
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|
|
|
|||
|
|
@ -0,0 +1,388 @@
|
|||
/*
|
||||
* Simple, generic PCI host controller driver targetting firmware-initialised
|
||||
* systems and virtual machines (e.g. the PCI emulation provided by kvmtool).
|
||||
*
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||||
* This program is free software; you can redistribute it and/or modify
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||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
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*
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||||
* 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 for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
*
|
||||
* Copyright (C) 2014 ARM Limited
|
||||
*
|
||||
* Author: Will Deacon <will.deacon@arm.com>
|
||||
*/
|
||||
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/of_address.h>
|
||||
#include <linux/of_pci.h>
|
||||
#include <linux/platform_device.h>
|
||||
|
||||
struct gen_pci_cfg_bus_ops {
|
||||
u32 bus_shift;
|
||||
void __iomem *(*map_bus)(struct pci_bus *, unsigned int, int);
|
||||
};
|
||||
|
||||
struct gen_pci_cfg_windows {
|
||||
struct resource res;
|
||||
struct resource bus_range;
|
||||
void __iomem **win;
|
||||
|
||||
const struct gen_pci_cfg_bus_ops *ops;
|
||||
};
|
||||
|
||||
struct gen_pci {
|
||||
struct pci_host_bridge host;
|
||||
struct gen_pci_cfg_windows cfg;
|
||||
struct list_head resources;
|
||||
};
|
||||
|
||||
static void __iomem *gen_pci_map_cfg_bus_cam(struct pci_bus *bus,
|
||||
unsigned int devfn,
|
||||
int where)
|
||||
{
|
||||
struct pci_sys_data *sys = bus->sysdata;
|
||||
struct gen_pci *pci = sys->private_data;
|
||||
resource_size_t idx = bus->number - pci->cfg.bus_range.start;
|
||||
|
||||
return pci->cfg.win[idx] + ((devfn << 8) | where);
|
||||
}
|
||||
|
||||
static struct gen_pci_cfg_bus_ops gen_pci_cfg_cam_bus_ops = {
|
||||
.bus_shift = 16,
|
||||
.map_bus = gen_pci_map_cfg_bus_cam,
|
||||
};
|
||||
|
||||
static void __iomem *gen_pci_map_cfg_bus_ecam(struct pci_bus *bus,
|
||||
unsigned int devfn,
|
||||
int where)
|
||||
{
|
||||
struct pci_sys_data *sys = bus->sysdata;
|
||||
struct gen_pci *pci = sys->private_data;
|
||||
resource_size_t idx = bus->number - pci->cfg.bus_range.start;
|
||||
|
||||
return pci->cfg.win[idx] + ((devfn << 12) | where);
|
||||
}
|
||||
|
||||
static struct gen_pci_cfg_bus_ops gen_pci_cfg_ecam_bus_ops = {
|
||||
.bus_shift = 20,
|
||||
.map_bus = gen_pci_map_cfg_bus_ecam,
|
||||
};
|
||||
|
||||
static int gen_pci_config_read(struct pci_bus *bus, unsigned int devfn,
|
||||
int where, int size, u32 *val)
|
||||
{
|
||||
void __iomem *addr;
|
||||
struct pci_sys_data *sys = bus->sysdata;
|
||||
struct gen_pci *pci = sys->private_data;
|
||||
|
||||
addr = pci->cfg.ops->map_bus(bus, devfn, where);
|
||||
|
||||
switch (size) {
|
||||
case 1:
|
||||
*val = readb(addr);
|
||||
break;
|
||||
case 2:
|
||||
*val = readw(addr);
|
||||
break;
|
||||
default:
|
||||
*val = readl(addr);
|
||||
}
|
||||
|
||||
return PCIBIOS_SUCCESSFUL;
|
||||
}
|
||||
|
||||
static int gen_pci_config_write(struct pci_bus *bus, unsigned int devfn,
|
||||
int where, int size, u32 val)
|
||||
{
|
||||
void __iomem *addr;
|
||||
struct pci_sys_data *sys = bus->sysdata;
|
||||
struct gen_pci *pci = sys->private_data;
|
||||
|
||||
addr = pci->cfg.ops->map_bus(bus, devfn, where);
|
||||
|
||||
switch (size) {
|
||||
case 1:
|
||||
writeb(val, addr);
|
||||
break;
|
||||
case 2:
|
||||
writew(val, addr);
|
||||
break;
|
||||
default:
|
||||
writel(val, addr);
|
||||
}
|
||||
|
||||
return PCIBIOS_SUCCESSFUL;
|
||||
}
|
||||
|
||||
static struct pci_ops gen_pci_ops = {
|
||||
.read = gen_pci_config_read,
|
||||
.write = gen_pci_config_write,
|
||||
};
|
||||
|
||||
static const struct of_device_id gen_pci_of_match[] = {
|
||||
{ .compatible = "pci-host-cam-generic",
|
||||
.data = &gen_pci_cfg_cam_bus_ops },
|
||||
|
||||
{ .compatible = "pci-host-ecam-generic",
|
||||
.data = &gen_pci_cfg_ecam_bus_ops },
|
||||
|
||||
{ },
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, gen_pci_of_match);
|
||||
|
||||
static int gen_pci_calc_io_offset(struct device *dev,
|
||||
struct of_pci_range *range,
|
||||
struct resource *res,
|
||||
resource_size_t *offset)
|
||||
{
|
||||
static atomic_t wins = ATOMIC_INIT(0);
|
||||
int err, idx, max_win;
|
||||
unsigned int window;
|
||||
|
||||
if (!PAGE_ALIGNED(range->cpu_addr))
|
||||
return -EINVAL;
|
||||
|
||||
max_win = (IO_SPACE_LIMIT + 1) / SZ_64K;
|
||||
idx = atomic_inc_return(&wins);
|
||||
if (idx > max_win)
|
||||
return -ENOSPC;
|
||||
|
||||
window = (idx - 1) * SZ_64K;
|
||||
err = pci_ioremap_io(window, range->cpu_addr);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
of_pci_range_to_resource(range, dev->of_node, res);
|
||||
res->start = window;
|
||||
res->end = res->start + range->size - 1;
|
||||
*offset = window - range->pci_addr;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int gen_pci_calc_mem_offset(struct device *dev,
|
||||
struct of_pci_range *range,
|
||||
struct resource *res,
|
||||
resource_size_t *offset)
|
||||
{
|
||||
of_pci_range_to_resource(range, dev->of_node, res);
|
||||
*offset = range->cpu_addr - range->pci_addr;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void gen_pci_release_of_pci_ranges(struct gen_pci *pci)
|
||||
{
|
||||
struct pci_host_bridge_window *win;
|
||||
|
||||
list_for_each_entry(win, &pci->resources, list)
|
||||
release_resource(win->res);
|
||||
|
||||
pci_free_resource_list(&pci->resources);
|
||||
}
|
||||
|
||||
static int gen_pci_parse_request_of_pci_ranges(struct gen_pci *pci)
|
||||
{
|
||||
struct of_pci_range range;
|
||||
struct of_pci_range_parser parser;
|
||||
int err, res_valid = 0;
|
||||
struct device *dev = pci->host.dev.parent;
|
||||
struct device_node *np = dev->of_node;
|
||||
|
||||
if (of_pci_range_parser_init(&parser, np)) {
|
||||
dev_err(dev, "missing \"ranges\" property\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
for_each_of_pci_range(&parser, &range) {
|
||||
struct resource *parent, *res;
|
||||
resource_size_t offset;
|
||||
u32 restype = range.flags & IORESOURCE_TYPE_BITS;
|
||||
|
||||
res = devm_kmalloc(dev, sizeof(*res), GFP_KERNEL);
|
||||
if (!res) {
|
||||
err = -ENOMEM;
|
||||
goto out_release_res;
|
||||
}
|
||||
|
||||
switch (restype) {
|
||||
case IORESOURCE_IO:
|
||||
parent = &ioport_resource;
|
||||
err = gen_pci_calc_io_offset(dev, &range, res, &offset);
|
||||
break;
|
||||
case IORESOURCE_MEM:
|
||||
parent = &iomem_resource;
|
||||
err = gen_pci_calc_mem_offset(dev, &range, res, &offset);
|
||||
res_valid |= !(res->flags & IORESOURCE_PREFETCH || err);
|
||||
break;
|
||||
default:
|
||||
err = -EINVAL;
|
||||
continue;
|
||||
}
|
||||
|
||||
if (err) {
|
||||
dev_warn(dev,
|
||||
"error %d: failed to add resource [type 0x%x, %lld bytes]\n",
|
||||
err, restype, range.size);
|
||||
continue;
|
||||
}
|
||||
|
||||
err = request_resource(parent, res);
|
||||
if (err)
|
||||
goto out_release_res;
|
||||
|
||||
pci_add_resource_offset(&pci->resources, res, offset);
|
||||
}
|
||||
|
||||
if (!res_valid) {
|
||||
dev_err(dev, "non-prefetchable memory resource required\n");
|
||||
err = -EINVAL;
|
||||
goto out_release_res;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
out_release_res:
|
||||
gen_pci_release_of_pci_ranges(pci);
|
||||
return err;
|
||||
}
|
||||
|
||||
static int gen_pci_parse_map_cfg_windows(struct gen_pci *pci)
|
||||
{
|
||||
int err;
|
||||
u8 bus_max;
|
||||
resource_size_t busn;
|
||||
struct resource *bus_range;
|
||||
struct device *dev = pci->host.dev.parent;
|
||||
struct device_node *np = dev->of_node;
|
||||
|
||||
if (of_pci_parse_bus_range(np, &pci->cfg.bus_range))
|
||||
pci->cfg.bus_range = (struct resource) {
|
||||
.name = np->name,
|
||||
.start = 0,
|
||||
.end = 0xff,
|
||||
.flags = IORESOURCE_BUS,
|
||||
};
|
||||
|
||||
err = of_address_to_resource(np, 0, &pci->cfg.res);
|
||||
if (err) {
|
||||
dev_err(dev, "missing \"reg\" property\n");
|
||||
return err;
|
||||
}
|
||||
|
||||
pci->cfg.win = devm_kcalloc(dev, resource_size(&pci->cfg.bus_range),
|
||||
sizeof(*pci->cfg.win), GFP_KERNEL);
|
||||
if (!pci->cfg.win)
|
||||
return -ENOMEM;
|
||||
|
||||
/* Limit the bus-range to fit within reg */
|
||||
bus_max = pci->cfg.bus_range.start +
|
||||
(resource_size(&pci->cfg.res) >> pci->cfg.ops->bus_shift) - 1;
|
||||
pci->cfg.bus_range.end = min_t(resource_size_t, pci->cfg.bus_range.end,
|
||||
bus_max);
|
||||
|
||||
/* Map our Configuration Space windows */
|
||||
if (!devm_request_mem_region(dev, pci->cfg.res.start,
|
||||
resource_size(&pci->cfg.res),
|
||||
"Configuration Space"))
|
||||
return -ENOMEM;
|
||||
|
||||
bus_range = &pci->cfg.bus_range;
|
||||
for (busn = bus_range->start; busn <= bus_range->end; ++busn) {
|
||||
u32 idx = busn - bus_range->start;
|
||||
u32 sz = 1 << pci->cfg.ops->bus_shift;
|
||||
|
||||
pci->cfg.win[idx] = devm_ioremap(dev,
|
||||
pci->cfg.res.start + busn * sz,
|
||||
sz);
|
||||
if (!pci->cfg.win[idx])
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
/* Register bus resource */
|
||||
pci_add_resource(&pci->resources, bus_range);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int gen_pci_setup(int nr, struct pci_sys_data *sys)
|
||||
{
|
||||
struct gen_pci *pci = sys->private_data;
|
||||
list_splice_init(&pci->resources, &sys->resources);
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int gen_pci_probe(struct platform_device *pdev)
|
||||
{
|
||||
int err;
|
||||
const char *type;
|
||||
const struct of_device_id *of_id;
|
||||
const int *prop;
|
||||
struct device *dev = &pdev->dev;
|
||||
struct device_node *np = dev->of_node;
|
||||
struct gen_pci *pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
|
||||
struct hw_pci hw = {
|
||||
.nr_controllers = 1,
|
||||
.private_data = (void **)&pci,
|
||||
.setup = gen_pci_setup,
|
||||
.map_irq = of_irq_parse_and_map_pci,
|
||||
.ops = &gen_pci_ops,
|
||||
};
|
||||
|
||||
if (!pci)
|
||||
return -ENOMEM;
|
||||
|
||||
type = of_get_property(np, "device_type", NULL);
|
||||
if (!type || strcmp(type, "pci")) {
|
||||
dev_err(dev, "invalid \"device_type\" %s\n", type);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
prop = of_get_property(of_chosen, "linux,pci-probe-only", NULL);
|
||||
if (prop) {
|
||||
if (*prop)
|
||||
pci_add_flags(PCI_PROBE_ONLY);
|
||||
else
|
||||
pci_clear_flags(PCI_PROBE_ONLY);
|
||||
}
|
||||
|
||||
of_id = of_match_node(gen_pci_of_match, np);
|
||||
pci->cfg.ops = of_id->data;
|
||||
pci->host.dev.parent = dev;
|
||||
INIT_LIST_HEAD(&pci->host.windows);
|
||||
INIT_LIST_HEAD(&pci->resources);
|
||||
|
||||
/* Parse our PCI ranges and request their resources */
|
||||
err = gen_pci_parse_request_of_pci_ranges(pci);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
/* Parse and map our Configuration Space windows */
|
||||
err = gen_pci_parse_map_cfg_windows(pci);
|
||||
if (err) {
|
||||
gen_pci_release_of_pci_ranges(pci);
|
||||
return err;
|
||||
}
|
||||
|
||||
pci_common_init_dev(dev, &hw);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver gen_pci_driver = {
|
||||
.driver = {
|
||||
.name = "pci-host-generic",
|
||||
.owner = THIS_MODULE,
|
||||
.of_match_table = gen_pci_of_match,
|
||||
},
|
||||
.probe = gen_pci_probe,
|
||||
};
|
||||
module_platform_driver(gen_pci_driver);
|
||||
|
||||
MODULE_DESCRIPTION("Generic PCI host driver");
|
||||
MODULE_AUTHOR("Will Deacon <will.deacon@arm.com>");
|
||||
MODULE_LICENSE("GPLv2");
|
||||
Loading…
Reference in New Issue