[PATCH v1 2/5] pci: designware: enhancements to support keystone pcie

Murali Karicheri
2014-05-15T16:01:29Z

keystone pcie hardware is based on designware hw version 3.65.
There is no support for ATU port and has registers in
application space to configure inbound/outbound access. Also
doesn't support PCI PVM option. The MSI IRQ registers available
in application space is used to mask/unmask/enable the MSI IRQs.

DW core driver is a set of common functions that are abstracted
to support DW pci drivers. To allow re-use of these functions for
keystone pci driver, core driver is to be enhanced.

Following are done to allow re-use of the functions on keystone pci
driver.

1. Some of the variables in pcie_port struct is folded inside
a union that now contains both new DW hw related variables as well
as old hardware related variables such as application reg base.
2. Added a dw_pcie_common_host_init() function that holds common
host initialization code for old and new hw.
3. dw_pcie_parse_resource() is used for parsing resource related
information from DT bindings.
4. dw_pcie_host_init() is called by new DW hw drivers as before.
Added dw_old_pcie_host_init() is it's counter part on old dw hw.
Both these functions now call dw_pcie_common_host_init().
5. Some of the static functions are made global to allow use from
dw old pci drivers such as pci-keystone.

CC: Mohit Kumar <mohit.kumar@st.com>
CC: Jingoo Han <jg1.han@samsung.com>
CC: Bjorn Helgaas <bhelgaas@google.com>
CC: Santosh Shilimkar <santosh.shilimkar@ti.com>

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
---
drivers/pci/host/pcie-designware.c | 101 ++++++++++++++++++++++++------------
drivers/pci/host/pcie-designware.h | 42 ++++++++++++---
2 files changed, 103 insertions(+), 40 deletions(-)

diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
index c4e3732..9ea8e79 100644
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -277,11 +277,15 @@ static int assign_irq(int no_irqs, struct msi_desc *desc, int *pos)
}
set_bit(pos0 + i, pp->msi_irq_in_use);
/*Enable corresponding interrupt in MSI interrupt controller */
- res = ((pos0 + i) / 32) * 12;
- bit = (pos0 + i) % 32;
- dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, &val);
- val |= 1 << bit;
- dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res, 4, val);
+ if (!(pp->version & DW_VERSION_OLD)) {
+ res = ((pos0 + i) / 32) * 12;
+ bit = (pos0 + i) % 32;
+ dw_pcie_rd_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res,
+ 4, &val);
+ val |= 1 << bit;
+ dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_ENABLE + res,
+ 4, val);
+ }
}

*pos = pos0;
@@ -349,7 +353,10 @@ static int dw_msi_setup_irq(struct msi_chip *chip, struct pci_dev *pdev,
*/
desc->msi_attrib.multiple = msgvec;

- msg.address_lo = virt_to_phys((void *)pp->msi_data);
+ if (pp->ops->get_msi_data)
+ msg.address_lo = pp->ops->get_msi_data(pp);
+ else
+ msg.address_lo = virt_to_phys((void *)pp->msi_data);
msg.address_hi = 0x0;
msg.data = pos;
write_msi_msg(irq, &msg);
@@ -389,13 +396,11 @@ static const struct irq_domain_ops msi_domain_ops = {
.map = dw_pcie_msi_map,
};

-int __init dw_pcie_host_init(struct pcie_port *pp)
+int __init dw_pcie_parse_resource(struct pcie_port *pp)
{
struct device_node *np = pp->dev->of_node;
- struct of_pci_range range;
struct of_pci_range_parser parser;
- u32 val;
- int i;
+ struct of_pci_range range;

if (of_pci_range_parser_init(&parser, np)) {
dev_err(pp->dev, "missing ranges property\n");
@@ -440,23 +445,17 @@ int __init dw_pcie_host_init(struct pcie_port *pp)
return -ENOMEM;
}
}
-
- pp->cfg0_base = pp->cfg.start;
- pp->cfg1_base = pp->cfg.start + pp->config.cfg0_size;
pp->mem_base = pp->mem.start;

- pp->va_cfg0_base = devm_ioremap(pp->dev, pp->cfg0_base,
- pp->config.cfg0_size);
- if (!pp->va_cfg0_base) {
- dev_err(pp->dev, "error with ioremap in function\n");
- return -ENOMEM;
- }
- pp->va_cfg1_base = devm_ioremap(pp->dev, pp->cfg1_base,
- pp->config.cfg1_size);
- if (!pp->va_cfg1_base) {
- dev_err(pp->dev, "error with ioremap\n");
- return -ENOMEM;
- }
+ return 0;
+}
+
+int __init dw_pcie_common_host_init(struct pcie_port *pp, struct hw_pci *hw,
+ const struct irq_domain_ops *irq_msi_ops)
+{
+ struct device_node *np = pp->dev->of_node;
+ u32 val;
+ int i;

if (of_property_read_u32(np, "num-lanes", &pp->lanes)) {
dev_err(pp->dev, "Failed to parse the number of lanes\n");
@@ -465,7 +464,7 @@ int __init dw_pcie_host_init(struct pcie_port *pp)

if (IS_ENABLED(CONFIG_PCI_MSI)) {
pp->irq_domain = irq_domain_add_linear(pp->dev->of_node,
- MAX_MSI_IRQS, &msi_domain_ops,
+ MAX_MSI_IRQS, irq_msi_ops,
&dw_pcie_msi_chip);
if (!pp->irq_domain) {
dev_err(pp->dev, "irq domain init failed\n");
@@ -488,10 +487,10 @@ int __init 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);

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

- pci_common_init_dev(pp->dev, &dw_pci);
+ pci_common_init_dev(pp->dev, hw);
pci_assign_unassigned_resources();
#ifdef CONFIG_PCI_DOMAINS
dw_pci.domain++;
@@ -500,6 +499,32 @@ int __init dw_pcie_host_init(struct pcie_port *pp)
return 0;
}

+int __init dw_pcie_host_init(struct pcie_port *pp)
+{
+ int ret;
+
+ ret = dw_pcie_parse_resource(pp);
+ if (ret)
+ return ret;
+
+ pp->cfg0_base = pp->cfg.start;
+ pp->cfg1_base = pp->cfg.start + pp->config.cfg0_size;
+ pp->va_cfg0_base = devm_ioremap(pp->dev, pp->cfg0_base,
+ pp->config.cfg0_size);
+ if (!pp->va_cfg0_base) {
+ dev_err(pp->dev, "error with ioremap in function\n");
+ return -ENOMEM;
+ }
+ pp->va_cfg1_base = devm_ioremap(pp->dev, pp->cfg1_base,
+ pp->config.cfg1_size);
+ if (!pp->va_cfg1_base) {
+ dev_err(pp->dev, "error with ioremap\n");
+ return -ENOMEM;
+ }
+
+ return dw_pcie_common_host_init(pp, &dw_pci, &msi_domain_ops);
+}
+
static void dw_pcie_prog_viewport_cfg0(struct pcie_port *pp, u32 busdev)
{
/* Program viewport 0 : OUTBOUND : CFG0 */
@@ -654,7 +679,11 @@ static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,

spin_lock_irqsave(&pp->conf_lock, flags);
if (bus->number != pp->root_bus_nr)
- ret = dw_pcie_rd_other_conf(pp, bus, devfn,
+ if (pp->ops->rd_other_conf)
+ ret = pp->ops->rd_other_conf(pp, bus, devfn,
+ where, size, val);
+ else
+ ret = dw_pcie_rd_other_conf(pp, bus, devfn,
where, size, val);
else
ret = dw_pcie_rd_own_conf(pp, where, size, val);
@@ -680,7 +709,11 @@ static int dw_pcie_wr_conf(struct pci_bus *bus, u32 devfn,

spin_lock_irqsave(&pp->conf_lock, flags);
if (bus->number != pp->root_bus_nr)
- ret = dw_pcie_wr_other_conf(pp, bus, devfn,
+ if (pp->ops->wr_other_conf)
+ ret = pp->ops->wr_other_conf(pp, bus, devfn,
+ where, size, val);
+ else
+ ret = dw_pcie_wr_other_conf(pp, bus, devfn,
where, size, val);
else
ret = dw_pcie_wr_own_conf(pp, where, size, val);
@@ -694,7 +727,7 @@ static struct pci_ops dw_pcie_ops = {
.write = dw_pcie_wr_conf,
};

-static int dw_pcie_setup(int nr, struct pci_sys_data *sys)
+int dw_pcie_setup(int nr, struct pci_sys_data *sys)
{
struct pcie_port *pp;

@@ -717,7 +750,7 @@ static int dw_pcie_setup(int nr, struct pci_sys_data *sys)
return 1;
}

-static struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys)
+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);
@@ -746,7 +779,7 @@ static int dw_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
return irq;
}

-static void dw_pcie_add_bus(struct pci_bus *bus)
+void dw_pcie_add_bus(struct pci_bus *bus)
{
if (IS_ENABLED(CONFIG_PCI_MSI)) {
struct pcie_port *pp = sys_to_pcie(bus->sysdata);
diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h
index 3063b35..e97f4d7 100644
--- a/drivers/pci/host/pcie-designware.h
+++ b/drivers/pci/host/pcie-designware.h
@@ -35,21 +35,39 @@ struct pcie_port {
struct device *dev;
u8 root_bus_nr;
void __iomem *dbi_base;
- u64 cfg0_base;
- void __iomem *va_cfg0_base;
- u64 cfg1_base;
- void __iomem *va_cfg1_base;
+ /*
+ * Old DW version implement application register space for
+ * MSI and has no ATU view port
+ */
+#define DW_VERSION_OLD BIT(0)
+ u32 version;
+ union {
+ /* new dw core specific */
+ struct {
+ u64 cfg0_base;
+ void __iomem *va_cfg0_base;
+ u64 cfg1_base;
+ void __iomem *va_cfg1_base;
+ int msi_irq;
+ };
+
+ /* old dw core specific */
+ struct {
+ struct irq_domain *legacy_irq_domain;
+ void __iomem *va_app_base;
+ u64 app_base;
+ };
+ };
u64 io_base;
u64 mem_base;
spinlock_t conf_lock;
- struct resource cfg;
struct resource io;
struct resource mem;
+ struct resource cfg;
struct pcie_port_info config;
int irq;
u32 lanes;
struct pcie_host_ops *ops;
- int msi_irq;
struct irq_domain *irq_domain;
unsigned long msi_data;
DECLARE_BITMAP(msi_irq_in_use, MAX_MSI_IRQS);
@@ -62,8 +80,13 @@ struct pcie_host_ops {
u32 val, void __iomem *dbi_base);
int (*rd_own_conf)(struct pcie_port *pp, int where, int size, u32 *val);
int (*wr_own_conf)(struct pcie_port *pp, int where, int size, u32 val);
+ int (*rd_other_conf)(struct pcie_port *pp, struct pci_bus *bus,
+ unsigned int devfn, int where, int size, u32 *val);
+ int (*wr_other_conf)(struct pcie_port *pp, struct pci_bus *bus,
+ unsigned int devfn, int where, int size, u32 val);
int (*link_up)(struct pcie_port *pp);
void (*host_init)(struct pcie_port *pp);
+ u32 (*get_msi_data)(struct pcie_port *pp);
};

int dw_pcie_cfg_read(void __iomem *addr, int where, int size, u32 *val);
@@ -73,5 +96,12 @@ void dw_pcie_msi_init(struct pcie_port *pp);
int dw_pcie_link_up(struct pcie_port *pp);
void dw_pcie_setup_rc(struct pcie_port *pp);
int dw_pcie_host_init(struct pcie_port *pp);
+int dw_pcie_setup(int nr, struct pci_sys_data *sys);
+struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys);
+void dw_pcie_add_bus(struct pci_bus *bus);
+int dw_pcie_parse_resource(struct pcie_port *pp);

+/* internal to dw core */
+int dw_pcie_common_host_init(struct pcie_port *pp, struct hw_pci *hw,
+ const struct irq_domain_ops *irq_ops);
#endif /* _PCIE_DESIGNWARE_H */
--
1.7.9.5