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Date: Fri, 16 May 2014 20:46:55 +0000
From: "Karicheri, Muralidharan" <m-karicheri2@...com>
To: "Karicheri, Muralidharan" <m-karicheri2@...com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"pratyush.anand@...com" <pratyush.anand@...com>,
"r65037@...escale.com" <r65037@...escale.com>,
"ABRAHAM, KISHON VIJAY" <kishon@...com>,
"marex@...x.de" <marex@...x.de>
CC: Mohit Kumar <mohit.kumar@...com>, Jingoo Han <jg1.han@...sung.com>,
"Bjorn Helgaas" <bhelgaas@...gle.com>,
"Shilimkar, Santosh" <santosh.shilimkar@...com>
Subject: RE: [PATCH v1 2/5] pci: designware: enhancements to support
keystone pcie
Adding more to list.
>-----Original Message-----
>From: Karicheri, Muralidharan
>Sent: Thursday, May 15, 2014 12:01 PM
>To: linux-kernel@...r.kernel.org; linux-pci@...r.kernel.org; linux-arm-
>kernel@...ts.infradead.org
>Cc: Karicheri, Muralidharan; Mohit Kumar; Jingoo Han; Bjorn Helgaas; Shilimkar, Santosh
>Subject: [PATCH v1 2/5] pci: designware: enhancements to support keystone pcie
>
>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@...com>
>CC: Jingoo Han <jg1.han@...sung.com>
>CC: Bjorn Helgaas <bhelgaas@...gle.com>
>CC: Santosh Shilimkar <santosh.shilimkar@...com>
>
>Signed-off-by: Murali Karicheri <m-karicheri2@...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
--
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