[PATCH v11 3/6] PCI: designware: Add ARM64 support

From: Zhou Wang
Date: Fri Oct 16 2015 - 06:09:40 EST

This patch tries to unify ARM32 and ARM64 PCIe in designware driver. Delete
function dw_pcie_setup, dw_pcie_scan_bus, dw_pcie_map_irq and struct hw_pci,
move related operations to dw_pcie_host_init.

This patch also try to use of_pci_get_host_bridge_resources for ARM32 and ARM64
according to the suggestion for Gabriele[1]

This patch reverts commit f4c55c5a3f7f ("PCI: designware: Program ATU with
untranslated address") based on 1/6 in this series. we delete *_mod_base in
pcie-designware. This was discussed in [2]

I have compiled the driver with multi_v7_defconfig. However, I don't have
ARM32 PCIe related board to do test. It will be appreciated if someone could
help to test it.

Signed-off-by: Zhou Wang <wangzhou1@xxxxxxxxxxxxx>
Signed-off-by: Gabriele Paoloni <gabriele.paoloni@xxxxxxxxxx>
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
Tested-by: James Morse <james.morse@xxxxxxx>
Tested-by: Gabriel Fernandez <gabriel.fernandez@xxxxxx>
Tested-by: Minghuan Lian <Minghuan.Lian@xxxxxxxxxxxxx>
Acked-by: Pratyush Anand <pratyush.anand@xxxxxxxxx>

[1] http://www.spinics.net/lists/linux-pci/msg42194.html
[2] http://www.spinics.net/lists/arm-kernel/msg436779.html
---
drivers/pci/host/pci-dra7xx.c | 14 +--
drivers/pci/host/pci-keystone-dw.c | 2 +-
drivers/pci/host/pcie-designware.c | 238 ++++++++++++-------------------------
drivers/pci/host/pcie-designware.h | 14 +--
4 files changed, 90 insertions(+), 178 deletions(-)

diff --git a/drivers/pci/host/pci-dra7xx.c b/drivers/pci/host/pci-dra7xx.c
index ebdffa0..b88c248 100644
--- a/drivers/pci/host/pci-dra7xx.c
+++ b/drivers/pci/host/pci-dra7xx.c
@@ -153,15 +153,15 @@ static void dra7xx_pcie_host_init(struct pcie_port *pp)
{
dw_pcie_setup_rc(pp);

- if (pp->io_mod_base)
- pp->io_mod_base &= CPU_TO_BUS_ADDR;
+ if (pp->io_base)
+ pp->io_base &= CPU_TO_BUS_ADDR;

- if (pp->mem_mod_base)
- pp->mem_mod_base &= CPU_TO_BUS_ADDR;
+ if (pp->mem_base)
+ pp->mem_base &= CPU_TO_BUS_ADDR;

- if (pp->cfg0_mod_base) {
- pp->cfg0_mod_base &= CPU_TO_BUS_ADDR;
- pp->cfg1_mod_base &= CPU_TO_BUS_ADDR;
+ if (pp->cfg0_base) {
+ pp->cfg0_base &= CPU_TO_BUS_ADDR;
+ pp->cfg1_base &= CPU_TO_BUS_ADDR;
}

dra7xx_pcie_establish_link(pp);
diff --git a/drivers/pci/host/pci-keystone-dw.c b/drivers/pci/host/pci-keystone-dw.c
index e71da99..8062ddb 100644
--- a/drivers/pci/host/pci-keystone-dw.c
+++ b/drivers/pci/host/pci-keystone-dw.c
@@ -322,7 +322,7 @@ static void ks_dw_pcie_clear_dbi_mode(void __iomem *reg_virt)
void ks_dw_pcie_setup_rc_app_regs(struct keystone_pcie *ks_pcie)
{
struct pcie_port *pp = &ks_pcie->pp;
- u32 start = pp->mem.start, end = pp->mem.end;
+ u32 start = pp->mem->start, end = pp->mem->end;
int i, tr_size;

/* Disable BARs for inbound access */
diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
index 75338a6..8ef74da 100644
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -11,6 +11,7 @@
* published by the Free Software Foundation.
*/

+#include <linux/hardirq.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/kernel.h>
@@ -69,16 +70,7 @@
#define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16)
#define PCIE_ATU_UPPER_TARGET 0x91C

-static struct hw_pci dw_pci;
-
-static unsigned long global_io_offset;
-
-static inline struct pcie_port *sys_to_pcie(struct pci_sys_data *sys)
-{
- BUG_ON(!sys->private_data);
-
- return sys->private_data;
-}
+static struct pci_ops dw_pcie_ops;

int dw_pcie_cfg_read(void __iomem *addr, int where, int size, u32 *val)
{
@@ -255,7 +247,7 @@ static void dw_pcie_msi_set_irq(struct pcie_port *pp, int irq)
static int assign_irq(int no_irqs, struct msi_desc *desc, int *pos)
{
int irq, pos0, i;
- struct pcie_port *pp = sys_to_pcie(msi_desc_to_pci_sysdata(desc));
+ struct pcie_port *pp = (struct pcie_port *) msi_desc_to_pci_sysdata(desc);

pos0 = bitmap_find_free_region(pp->msi_irq_in_use, MAX_MSI_IRQS,
order_base_2(no_irqs));
@@ -298,7 +290,7 @@ static int dw_msi_setup_irq(struct msi_controller *chip, struct pci_dev *pdev,
{
int irq, pos;
struct msi_msg msg;
- struct pcie_port *pp = sys_to_pcie(pdev->bus->sysdata);
+ struct pcie_port *pp = pdev->bus->sysdata;

if (desc->msi_attrib.is_msix)
return -EINVAL;
@@ -327,7 +319,7 @@ static void dw_msi_teardown_irq(struct msi_controller *chip, unsigned int irq)
{
struct irq_data *data = irq_get_irq_data(irq);
struct msi_desc *msi = irq_data_get_msi_desc(data);
- struct pcie_port *pp = sys_to_pcie(msi_desc_to_pci_sysdata(msi));
+ struct pcie_port *pp = (struct pcie_port *) msi_desc_to_pci_sysdata(msi);

clear_irq_range(pp, irq, 1, data->hwirq);
}
@@ -362,14 +354,12 @@ int dw_pcie_host_init(struct pcie_port *pp)
{
struct device_node *np = pp->dev->of_node;
struct platform_device *pdev = to_platform_device(pp->dev);
- struct of_pci_range range;
- struct of_pci_range_parser parser;
+ struct pci_bus *bus;
struct resource *cfg_res;
- u32 val, ns;
- const __be32 *addrp;
- int i, index, ret;
-
- ns = of_n_size_cells(np);
+ LIST_HEAD(res);
+ u32 val;
+ int i, ret;
+ struct resource_entry *win;

cfg_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "config");
if (cfg_res) {
@@ -377,85 +367,60 @@ int dw_pcie_host_init(struct pcie_port *pp)
pp->cfg1_size = resource_size(cfg_res)/2;
pp->cfg0_base = cfg_res->start;
pp->cfg1_base = cfg_res->start + pp->cfg0_size;
-
- /* Find the untranslated configuration space address */
- index = of_property_match_string(np, "reg-names", "config");
- addrp = of_get_address(np, index, NULL, NULL);
- pp->cfg0_mod_base = of_read_number(addrp, ns);
- pp->cfg1_mod_base = pp->cfg0_mod_base + pp->cfg0_size;
} else if (!pp->va_cfg0_base) {
dev_err(pp->dev, "missing *config* reg space\n");
}

- if (of_pci_range_parser_init(&parser, np)) {
- dev_err(pp->dev, "missing ranges property\n");
- return -EINVAL;
- }
+ ret = of_pci_get_host_bridge_resources(np, 0, 0xff, &res, &pp->io_base);
+ if (ret)
+ return ret;

/* Get the I/O and memory ranges from DT */
- for_each_of_pci_range(&parser, &range) {
- unsigned long restype = range.flags & IORESOURCE_TYPE_BITS;
-
- if (restype == IORESOURCE_IO) {
- of_pci_range_to_resource(&range, np, &pp->io);
- pp->io.name = "I/O";
- pp->io.start = max_t(resource_size_t,
- PCIBIOS_MIN_IO,
- range.pci_addr + global_io_offset);
- pp->io.end = min_t(resource_size_t,
- IO_SPACE_LIMIT,
- range.pci_addr + range.size
- + global_io_offset - 1);
- pp->io_size = resource_size(&pp->io);
- pp->io_bus_addr = range.pci_addr;
- pp->io_base = range.cpu_addr;
-
- /* Find the untranslated IO space address */
- pp->io_mod_base = range.cpu_addr;
- }
- if (restype == IORESOURCE_MEM) {
- of_pci_range_to_resource(&range, np, &pp->mem);
- pp->mem.name = "MEM";
- pp->mem_size = resource_size(&pp->mem);
- pp->mem_bus_addr = range.pci_addr;
-
- /* Find the untranslated MEM space address */
- pp->mem_mod_base = range.cpu_addr;
- }
- if (restype == 0) {
- of_pci_range_to_resource(&range, np, &pp->cfg);
- pp->cfg0_size = resource_size(&pp->cfg)/2;
- pp->cfg1_size = resource_size(&pp->cfg)/2;
- pp->cfg0_base = pp->cfg.start;
- pp->cfg1_base = pp->cfg.start + pp->cfg0_size;
-
- /* Find the untranslated configuration space address */
- pp->cfg0_mod_base = range.cpu_addr;
- pp->cfg1_mod_base = pp->cfg0_mod_base +
- pp->cfg0_size;
+ resource_list_for_each_entry(win, &res) {
+ switch (resource_type(win->res)) {
+ case IORESOURCE_IO:
+ pp->io = win->res;
+ pp->io->name = "I/O";
+ pp->io_size = resource_size(pp->io);
+ pp->io_bus_addr = pp->io->start - win->offset;
+ ret = pci_remap_iospace(pp->io, pp->io_base);
+ if (ret) {
+ dev_warn(pp->dev, "error %d: failed to map resource %pR\n",
+ ret, pp->io);
+ continue;
+ }
+ break;
+ case IORESOURCE_MEM:
+ pp->mem = win->res;
+ pp->mem->name = "MEM";
+ pp->mem_size = resource_size(pp->mem);
+ pp->mem_bus_addr = pp->mem->start - win->offset;
+ break;
+ case 0:
+ pp->cfg = win->res;
+ pp->cfg0_size = resource_size(pp->cfg)/2;
+ pp->cfg1_size = resource_size(pp->cfg)/2;
+ pp->cfg0_base = pp->cfg->start;
+ pp->cfg1_base = pp->cfg->start + pp->cfg0_size;
+ break;
+ case IORESOURCE_BUS:
+ pp->busn = win->res;
+ break;
+ default:
+ continue;
}
}

- ret = of_pci_parse_bus_range(np, &pp->busn);
- if (ret < 0) {
- pp->busn.name = np->name;
- pp->busn.start = 0;
- pp->busn.end = 0xff;
- pp->busn.flags = IORESOURCE_BUS;
- dev_dbg(pp->dev, "failed to parse bus-range property: %d, using default %pR\n",
- ret, &pp->busn);
- }
-
if (!pp->dbi_base) {
- pp->dbi_base = devm_ioremap(pp->dev, pp->cfg.start,
- resource_size(&pp->cfg));
+ pp->dbi_base = devm_ioremap(pp->dev, pp->cfg->start,
+ resource_size(pp->cfg));
if (!pp->dbi_base) {
dev_err(pp->dev, "error with ioremap\n");
return -ENOMEM;
}
}

- pp->mem_base = pp->mem.start;
+ pp->mem_base = pp->mem->start;

if (!pp->va_cfg0_base) {
pp->va_cfg0_base = devm_ioremap(pp->dev, pp->cfg0_base,
@@ -504,7 +469,7 @@ int dw_pcie_host_init(struct pcie_port *pp)

if (!pp->ops->rd_other_conf)
dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX1,
- PCIE_ATU_TYPE_MEM, pp->mem_mod_base,
+ PCIE_ATU_TYPE_MEM, pp->mem_base,
pp->mem_bus_addr, pp->mem_size);

dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
@@ -516,14 +481,28 @@ int dw_pcie_host_init(struct pcie_port *pp)
val |= PORT_LOGIC_SPEED_CHANGE;
dw_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val);

-#ifdef CONFIG_PCI_MSI
- dw_pcie_msi_chip.dev = pp->dev;
-#endif
+ pp->root_bus_nr = pp->busn->start;
+ if (IS_ENABLED(CONFIG_PCI_MSI)) {
+ bus = pci_scan_root_bus_msi(pp->dev, pp->root_bus_nr,
+ &dw_pcie_ops, pp, &res,
+ &dw_pcie_msi_chip);
+ dw_pcie_msi_chip.dev = pp->dev;
+ } else
+ bus = pci_scan_root_bus(pp->dev, pp->root_bus_nr, &dw_pcie_ops,
+ pp, &res);
+ if (!bus)
+ return -ENOMEM;

- dw_pci.nr_controllers = 1;
- dw_pci.private_data = (void **)&pp;
+ if (pp->ops->scan_bus)
+ pp->ops->scan_bus(pp);

- pci_common_init_dev(pp->dev, &dw_pci);
+#ifdef CONFIG_ARM
+ /* support old dtbs that incorrectly describe IRQs */
+ pci_fixup_irqs(pci_common_swizzle, of_irq_parse_and_map_pci);
+#endif
+
+ pci_assign_unassigned_bus_resources(bus);
+ pci_bus_add_devices(bus);

return 0;
}
@@ -542,12 +521,12 @@ static int dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,

if (bus->parent->number == pp->root_bus_nr) {
type = PCIE_ATU_TYPE_CFG0;
- cpu_addr = pp->cfg0_mod_base;
+ cpu_addr = pp->cfg0_base;
cfg_size = pp->cfg0_size;
va_cfg_base = pp->va_cfg0_base;
} else {
type = PCIE_ATU_TYPE_CFG1;
- cpu_addr = pp->cfg1_mod_base;
+ cpu_addr = pp->cfg1_base;
cfg_size = pp->cfg1_size;
va_cfg_base = pp->va_cfg1_base;
}
@@ -557,7 +536,7 @@ static int dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
busdev, cfg_size);
ret = dw_pcie_cfg_read(va_cfg_base + address, where, size, val);
dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX0,
- PCIE_ATU_TYPE_IO, pp->io_mod_base,
+ PCIE_ATU_TYPE_IO, pp->io_base,
pp->io_bus_addr, pp->io_size);

return ret;
@@ -577,12 +556,12 @@ static int dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,

if (bus->parent->number == pp->root_bus_nr) {
type = PCIE_ATU_TYPE_CFG0;
- cpu_addr = pp->cfg0_mod_base;
+ cpu_addr = pp->cfg0_base;
cfg_size = pp->cfg0_size;
va_cfg_base = pp->va_cfg0_base;
} else {
type = PCIE_ATU_TYPE_CFG1;
- cpu_addr = pp->cfg1_mod_base;
+ cpu_addr = pp->cfg1_base;
cfg_size = pp->cfg1_size;
va_cfg_base = pp->va_cfg1_base;
}
@@ -592,7 +571,7 @@ static int dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
busdev, cfg_size);
ret = dw_pcie_cfg_write(va_cfg_base + address, where, size, val);
dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX0,
- PCIE_ATU_TYPE_IO, pp->io_mod_base,
+ PCIE_ATU_TYPE_IO, pp->io_base,
pp->io_bus_addr, pp->io_size);

return ret;
@@ -624,7 +603,7 @@ static int dw_pcie_valid_config(struct pcie_port *pp,
static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
int size, u32 *val)
{
- struct pcie_port *pp = sys_to_pcie(bus->sysdata);
+ struct pcie_port *pp = bus->sysdata;
int ret;

if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0) {
@@ -648,7 +627,7 @@ static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
static int dw_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
int where, int size, u32 val)
{
- struct pcie_port *pp = sys_to_pcie(bus->sysdata);
+ struct pcie_port *pp = bus->sysdata;
int ret;

if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0)
@@ -672,69 +651,6 @@ static struct pci_ops dw_pcie_ops = {
.write = dw_pcie_wr_conf,
};

-static int dw_pcie_setup(int nr, struct pci_sys_data *sys)
-{
- struct pcie_port *pp;
-
- pp = sys_to_pcie(sys);
-
- if (global_io_offset < SZ_1M && pp->io_size > 0) {
- sys->io_offset = global_io_offset - pp->io_bus_addr;
- pci_ioremap_io(global_io_offset, pp->io_base);
- global_io_offset += SZ_64K;
- pci_add_resource_offset(&sys->resources, &pp->io,
- sys->io_offset);
- }
-
- sys->mem_offset = pp->mem.start - pp->mem_bus_addr;
- pci_add_resource_offset(&sys->resources, &pp->mem, sys->mem_offset);
- pci_add_resource(&sys->resources, &pp->busn);
-
- return 1;
-}
-
-static struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys)
-{
- struct pci_bus *bus;
- struct pcie_port *pp = sys_to_pcie(sys);
-
- pp->root_bus_nr = sys->busnr;
-
- if (IS_ENABLED(CONFIG_PCI_MSI))
- bus = pci_scan_root_bus_msi(pp->dev, sys->busnr, &dw_pcie_ops,
- sys, &sys->resources,
- &dw_pcie_msi_chip);
- else
- bus = pci_scan_root_bus(pp->dev, sys->busnr, &dw_pcie_ops,
- sys, &sys->resources);
-
- if (!bus)
- return NULL;
-
- if (bus && pp->ops->scan_bus)
- pp->ops->scan_bus(pp);
-
- return bus;
-}
-
-static int dw_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
-{
- struct pcie_port *pp = sys_to_pcie(dev->bus->sysdata);
- int irq;
-
- irq = of_irq_parse_and_map_pci(dev, slot, pin);
- if (!irq)
- irq = pp->irq;
-
- return irq;
-}
-
-static struct hw_pci dw_pci = {
- .setup = dw_pcie_setup,
- .scan = dw_pcie_scan_bus,
- .map_irq = dw_pcie_map_irq,
-};
-
void dw_pcie_setup_rc(struct pcie_port *pp)
{
u32 val;
diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h
index d0bbd27..264c969 100644
--- a/drivers/pci/host/pcie-designware.h
+++ b/drivers/pci/host/pcie-designware.h
@@ -27,25 +27,21 @@ struct pcie_port {
u8 root_bus_nr;
void __iomem *dbi_base;
u64 cfg0_base;
- u64 cfg0_mod_base;
void __iomem *va_cfg0_base;
u32 cfg0_size;
u64 cfg1_base;
- u64 cfg1_mod_base;
void __iomem *va_cfg1_base;
u32 cfg1_size;
- u64 io_base;
- u64 io_mod_base;
+ resource_size_t io_base;
phys_addr_t io_bus_addr;
u32 io_size;
u64 mem_base;
- u64 mem_mod_base;
phys_addr_t mem_bus_addr;
u32 mem_size;
- struct resource cfg;
- struct resource io;
- struct resource mem;
- struct resource busn;
+ struct resource *cfg;
+ struct resource *io;
+ struct resource *mem;
+ struct resource *busn;
int irq;
u32 lanes;
struct pcie_host_ops *ops;
--
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/