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

Kumar Gala
2014-05-16T22:15:33Z

On May 15, 2014, at 11:01 AM, Murali Karicheri <m-karicheri2@ti.com> wrote:

> 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.

Can we split this into patches that do these 5 things?

Also, using OLD seems like a bad choice, what happens when we have NEW NEW in the future?

>
> 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
>
>
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> linux-arm-kernel at lists.infradead.org
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