Re: [PATCH v7 3/5] PCI: designware: enhance dw_pcie_host_init() to support v3.65 DW hardware

Jingoo Han
2014-07-23T01:27:34Z

On Tuesday, July 22, 2014 1:59 AM, Murali Karicheri wrote:
>
> keystone PCI controller is based on v3.65 designware hardware. This
> version differs from newer versions of the hardware in few functional
> areas discussed below that makes it necessary to change dw_pcie_host_init()
> to support v3.65 based PCI controller.
>
> 1. No support for ATU port. So any ATU specific resource handling code
> is to be bypassed for v3.65 h/w.
> 2. MSI controller uses Application space to implement MSI and 32 MSI
> interrupts are multiplexed over 8 IRQs to the host. Hence the code
> to process MSI IRQ needs to be different. This patch allows platform
> driver to provide its own irq_domain_ops ptr to irq_domain_add_linear()
> through an API callback from the designware core driver.
> 3. MSI interrupt generation requires EP to write to the RC's application
> register. So enhance the driver to allow setup of inbound access to
> MSI irq register as a post scan bus API callback.
>
> Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
> Reviewed-by: Pratyush Anand <pratyush.anand@st.com>
> Acked-by: Mohit KUMAR <mohit.kumar@st.com>
>
> CC: Santosh Shilimkar <santosh.shilimkar@ti.com>
> CC: Russell King <linux@arm.linux.org.uk>
> CC: Grant Likely <grant.likely@linaro.org>
> CC: Rob Herring <robh+dt@kernel.org>
> CC: Jingoo Han <jg1.han@samsung.com>

Acked-by: Jingoo Han <jg1.han@samsung.com>

Best regards,
Jingoo Han

> CC: Bjorn Helgaas <bhelgaas@google.com>
> CC: Richard Zhu <r65037@freescale.com>
> CC: Kishon Vijay Abraham I <kishon@ti.com>
> CC: Marek Vasut <marex@denx.de>
> CC: Arnd Bergmann <arnd@arndb.de>
> CC: Pawel Moll <pawel.moll@arm.com>
> CC: Mark Rutland <mark.rutland@arm.com>
> CC: Ian Campbell <ijc+devicetree@hellion.org.uk>
> CC: Kumar Gala <galak@codeaurora.org>
> CC: Randy Dunlap <rdunlap@infradead.org>
> CC: Grant Likely <grant.likely@linaro.org>
> ---
> drivers/pci/host/pcie-designware.c | 54 +++++++++++++++++++++++-------------
> drivers/pci/host/pcie-designware.h | 2 ++
> 2 files changed, 36 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
> index 905941c..35bb4af 100644
> --- a/drivers/pci/host/pcie-designware.c
> +++ b/drivers/pci/host/pcie-designware.c
> @@ -420,8 +420,8 @@ int __init dw_pcie_host_init(struct pcie_port *pp)
> struct device_node *np = pp->dev->of_node;
> struct of_pci_range range;
> struct of_pci_range_parser parser;
> + int i, ret;
> u32 val;
> - int i;
>
> if (of_pci_range_parser_init(&parser, np)) {
> dev_err(pp->dev, "missing ranges property\n");
> @@ -467,21 +467,26 @@ int __init dw_pcie_host_init(struct pcie_port *pp)
> }
> }
>
> - 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->cfg0_base = pp->cfg.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;
> + pp->cfg1_base = pp->cfg.start + pp->config.cfg0_size;
> + 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;
> + }
> }
>
> if (of_property_read_u32(np, "num-lanes", &pp->lanes)) {
> @@ -490,16 +495,22 @@ 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,
> - &dw_pcie_msi_chip);
> - if (!pp->irq_domain) {
> - dev_err(pp->dev, "irq domain init failed\n");
> - return -ENXIO;
> - }
> + if (!pp->ops->msi_host_init) {
> + pp->irq_domain = irq_domain_add_linear(pp->dev->of_node,
> + MAX_MSI_IRQS, &msi_domain_ops,
> + &dw_pcie_msi_chip);
> + if (!pp->irq_domain) {
> + dev_err(pp->dev, "irq domain init failed\n");
> + return -ENXIO;
> + }
>
> - for (i = 0; i < MAX_MSI_IRQS; i++)
> - irq_create_mapping(pp->irq_domain, i);
> + for (i = 0; i < MAX_MSI_IRQS; i++)
> + irq_create_mapping(pp->irq_domain, i);
> + } else {
> + ret = pp->ops->msi_host_init(pp, &dw_pcie_msi_chip);
> + if (ret < 0)
> + return ret;
> + }
> }
>
> if (pp->ops->host_init)
> @@ -759,6 +770,9 @@ static struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys)
> BUG();
> }
>
> + if (bus && pp->ops->scan_bus)
> + pp->ops->scan_bus(pp);
> +
> return bus;
> }
>
> diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h
> index 387f69e..080c649 100644
> --- a/drivers/pci/host/pcie-designware.h
> +++ b/drivers/pci/host/pcie-designware.h
> @@ -70,6 +70,8 @@ struct pcie_host_ops {
> void (*msi_set_irq)(struct pcie_port *pp, int irq);
> void (*msi_clear_irq)(struct pcie_port *pp, int irq);
> u32 (*get_msi_data)(struct pcie_port *pp);
> + void (*scan_bus)(struct pcie_port *pp);
> + int (*msi_host_init)(struct pcie_port *pp, struct msi_chip *chip);
> };
>
> int dw_pcie_cfg_read(void __iomem *addr, int where, int size, u32 *val);
> --
> 1.7.9.5