Commit 1958e717 authored by Jayachandran C's avatar Jayachandran C Committed by Bjorn Helgaas
Browse files

PCI: generic, thunder: Use generic ECAM API 



Use functions provided by drivers/pci/ecam.h for mapping the config space
in drivers/pci/host/pci-host-common.c, and update its users to use 'struct
pci_config_window' and 'struct pci_ecam_ops'.

The changes are mostly to use 'struct pci_config_window' in place of
'struct gen_pci'.  Some of the fields of gen_pci were only used temporarily
and can be eliminated by using local variables or function arguments, these
are not carried over to struct pci_config_window.

pci-thunder-ecam.c and pci-thunder-pem.c are the only users of the
pci_host_common_probe function and the gen_pci structure; these have been
updated to use the new API as well.

The patch does not introduce any functional changes other than a very minor
one: with the new code, on 64-bit platforms, we do just a single ioremap
for the whole config space.

Signed-off-by: default avatarJayachandran C <jchandra@broadcom.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
parent 35ff9477

drivers/pci/ecam.h

+5 −0
Original line number Diff line number Diff line
@@ -59,4 +59,9 @@ void __iomem *pci_ecam_map_bus(struct pci_bus *bus, unsigned int devfn, 
/* default ECAM ops */

extern struct pci_ecam_ops pci_generic_ecam_ops;



#ifdef CONFIG_PCI_HOST_GENERIC

/* for DT-based PCI controllers that support ECAM */

int pci_host_common_probe(struct platform_device *pdev,

			  struct pci_ecam_ops *ops);

#endif

#endif

drivers/pci/host/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -77,6 +77,7 @@ config PCI_RCAR_GEN2_PCIE 


config PCI_HOST_COMMON

	bool

	select PCI_ECAM



config PCI_HOST_GENERIC

	bool "Generic PCI host controller"

drivers/pci/host/pci-host-common.c

+46 −68
Original line number Diff line number Diff line
@@ -22,27 +22,21 @@ 
#include <linux/of_pci.h>

#include <linux/platform_device.h>



#include "pci-host-common.h"

#include "../ecam.h"



static void gen_pci_release_of_pci_ranges(struct gen_pci *pci)

{

	pci_free_resource_list(&pci->resources);

}



static int gen_pci_parse_request_of_pci_ranges(struct gen_pci *pci)

static int gen_pci_parse_request_of_pci_ranges(struct device *dev,

		       struct list_head *resources, struct resource **bus_range)

{

	int err, res_valid = 0;

	struct device *dev = pci->host.dev.parent;

	struct device_node *np = dev->of_node;

	resource_size_t iobase;

	struct resource_entry *win;



	err = of_pci_get_host_bridge_resources(np, 0, 0xff, &pci->resources,

					       &iobase);

	err = of_pci_get_host_bridge_resources(np, 0, 0xff, resources, &iobase);

	if (err)

		return err;



	resource_list_for_each_entry(win, &pci->resources) {

	resource_list_for_each_entry(win, resources) {

		struct resource *parent, *res = win->res;



		switch (resource_type(res)) {
@@ -60,7 +54,7 @@ static int gen_pci_parse_request_of_pci_ranges(struct gen_pci *pci) 
			res_valid |= !(res->flags & IORESOURCE_PREFETCH);

			break;

		case IORESOURCE_BUS:

			pci->cfg.bus_range = res;

			*bus_range = res;

		default:

			continue;

		}
@@ -79,65 +73,60 @@ static int gen_pci_parse_request_of_pci_ranges(struct gen_pci *pci) 
	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)

static void gen_pci_unmap_cfg(void *ptr)

{

	pci_ecam_free((struct pci_config_window *)ptr);

}



static struct pci_config_window *gen_pci_init(struct device *dev,

		struct list_head *resources, struct pci_ecam_ops *ops)

{

	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;

	u32 sz = 1 << pci->cfg.ops->bus_shift;

	struct resource cfgres;

	struct resource *bus_range = NULL;

	struct pci_config_window *cfg;



	err = of_address_to_resource(np, 0, &pci->cfg.res);

	/* Parse our PCI ranges and request their resources */

	err = gen_pci_parse_request_of_pci_ranges(dev, resources, &bus_range);

	if (err)

		goto err_out;



	err = of_address_to_resource(dev->of_node, 0, &cfgres);

	if (err) {

		dev_err(dev, "missing \"reg\" property\n");

		return err;

		goto err_out;

	}



	/* 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);



	pci->cfg.win = devm_kcalloc(dev, resource_size(pci->cfg.bus_range),

				    sizeof(*pci->cfg.win), GFP_KERNEL);

	if (!pci->cfg.win)

		return -ENOMEM;



	/* 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;



		pci->cfg.win[idx] = devm_ioremap(dev,

						 pci->cfg.res.start + idx * sz,

						 sz);

		if (!pci->cfg.win[idx])

			return -ENOMEM;

	cfg = pci_ecam_create(dev, &cfgres, bus_range, ops);

	if (IS_ERR(cfg)) {

		err = PTR_ERR(cfg);

		goto err_out;

	}



	return 0;

	err = devm_add_action(dev, gen_pci_unmap_cfg, cfg);

	if (err) {

		gen_pci_unmap_cfg(cfg);

		goto err_out;

	}

	return cfg;



err_out:

	pci_free_resource_list(resources);

	return ERR_PTR(err);

}



int pci_host_common_probe(struct platform_device *pdev,

			  struct gen_pci *pci)

			  struct pci_ecam_ops *ops)

{

	int err;

	const char *type;

	struct device *dev = &pdev->dev;

	struct device_node *np = dev->of_node;

	struct pci_bus *bus, *child;

	struct pci_config_window *cfg;

	struct list_head resources;



	type = of_get_property(np, "device_type", NULL);

	if (!type || strcmp(type, "pci")) {
@@ -147,29 +136,18 @@ int pci_host_common_probe(struct platform_device *pdev, 


	of_pci_check_probe_only();



	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;

	}

	INIT_LIST_HEAD(&resources);

	cfg = gen_pci_init(dev, &resources, ops);

	if (IS_ERR(cfg))

		return PTR_ERR(cfg);



	/* Do not reassign resources if probe only */

	if (!pci_has_flag(PCI_PROBE_ONLY))

		pci_add_flags(PCI_REASSIGN_ALL_RSRC | PCI_REASSIGN_ALL_BUS);





	bus = pci_scan_root_bus(dev, pci->cfg.bus_range->start,

				&pci->cfg.ops->ops, pci, &pci->resources);

	bus = pci_scan_root_bus(dev, cfg->busr.start, &ops->pci_ops, cfg,

				&resources);

	if (!bus) {

		dev_err(dev, "Scanning rootbus failed");

		return -ENODEV;

drivers/pci/host/pci-host-common.h

deleted100644 → 0
+0 −47
Original line number Diff line number Diff line 
/*

 * 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.

 *

 * 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>

 */



#ifndef _PCI_HOST_COMMON_H

#define _PCI_HOST_COMMON_H



#include <linux/kernel.h>

#include <linux/platform_device.h>



struct gen_pci_cfg_bus_ops {

	u32 bus_shift;

	struct pci_ops ops;

};



struct gen_pci_cfg_windows {

	struct resource				res;

	struct resource				*bus_range;

	void __iomem				**win;



	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;

};



int pci_host_common_probe(struct platform_device *pdev,

			  struct gen_pci *pci);



#endif /* _PCI_HOST_COMMON_H */

drivers/pci/host/pci-host-generic.c

+10 −42
Original line number Diff line number Diff line
@@ -25,41 +25,12 @@ 
#include <linux/of_pci.h>

#include <linux/platform_device.h>



#include "pci-host-common.h"

#include "../ecam.h"



static void __iomem *gen_pci_map_cfg_bus_cam(struct pci_bus *bus,

					     unsigned int devfn,

					     int where)

{

	struct gen_pci *pci = bus->sysdata;

	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 = {

static struct pci_ecam_ops gen_pci_cfg_cam_bus_ops = {

	.bus_shift	= 16,

	.ops		= {

		.map_bus	= gen_pci_map_cfg_bus_cam,

		.read		= pci_generic_config_read,

		.write		= pci_generic_config_write,

	}

};



static void __iomem *gen_pci_map_cfg_bus_ecam(struct pci_bus *bus,

					      unsigned int devfn,

					      int where)

{

	struct gen_pci *pci = bus->sysdata;

	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,

	.ops		= {

		.map_bus	= gen_pci_map_cfg_bus_ecam,

	.pci_ops	= {

		.map_bus	= pci_ecam_map_bus,

		.read		= pci_generic_config_read,

		.write		= pci_generic_config_write,

	}
@@ -70,25 +41,22 @@ static const struct of_device_id gen_pci_of_match[] = { 
	  .data = &gen_pci_cfg_cam_bus_ops },



	{ .compatible = "pci-host-ecam-generic",

	  .data = &gen_pci_cfg_ecam_bus_ops },

	  .data = &pci_generic_ecam_ops },



	{ },

};



MODULE_DEVICE_TABLE(of, gen_pci_of_match);



static int gen_pci_probe(struct platform_device *pdev)

{

	struct device *dev = &pdev->dev;

	const struct of_device_id *of_id;

	struct gen_pci *pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);



	if (!pci)

		return -ENOMEM;

	struct pci_ecam_ops *ops;



	of_id = of_match_node(gen_pci_of_match, dev->of_node);

	pci->cfg.ops = (struct gen_pci_cfg_bus_ops *)of_id->data;

	of_id = of_match_node(gen_pci_of_match, pdev->dev.of_node);

	ops = (struct pci_ecam_ops *)of_id->data;



	return pci_host_common_probe(pdev, pci);

	return pci_host_common_probe(pdev, ops);

}



static struct platform_driver gen_pci_driver = {

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