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PCI: designware: Move Root Complex setup code to dw_pcie_setup_rc()

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dw_pcie_host_init() looks up host bridge resources, ioremaps them, creates
IRQ domains, and enumerates devices below the bridge.  dw_pcie_setup_rc()
programs the Root Complex registers.  The Root Complex may lose power
during suspend-to-RAM, and when we resume, we want to redo the latter but
not the former.

Move some Root Complex programming from dw_pcie_host_init() to
dw_pcie_setup_rc() where it belongs.  DesignWare-based drivers can call
dw_pcie_setup_rc() in their resume paths.

[Niklas Cassel <niklas.cassel@axis.com>:  This change moves outbound ATU
programming, which uses pp->mem_base, to dw_pcie_setup_rc().  Apply the
dra7xx pp->mem_base update before calling dw_pcie_setup_rc().]

[bhelgaas: changelog, fold in dra7xx fix from Niklas]
Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Pratyush Anand <pratyush.anand@gmail.com>
This commit is contained in:
Jisheng Zhang 2016-03-16 19:40:33 +08:00 committed by Bjorn Helgaas
parent 9735a22799
commit 7e57fd1444
2 changed files with 21 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/pci/host/pci-dra7xx.c
View File

@ -142,13 +142,13 @@ static void dra7xx_pcie_enable_interrupts(struct pcie_port *pp)
static void dra7xx_pcie_host_init(struct pcie_port *pp)
{
dw_pcie_setup_rc(pp);
pp->io_base &= DRA7XX_CPU_TO_BUS_ADDR;
pp->mem_base &= DRA7XX_CPU_TO_BUS_ADDR;
pp->cfg0_base &= DRA7XX_CPU_TO_BUS_ADDR;
pp->cfg1_base &= DRA7XX_CPU_TO_BUS_ADDR;
dw_pcie_setup_rc(pp);
dra7xx_pcie_establish_link(pp);
if (IS_ENABLED(CONFIG_PCI_MSI))
dw_pcie_msi_init(pp);

39
drivers/pci/host/pcie-designware.c
View File

@ -434,7 +434,6 @@ int dw_pcie_host_init(struct pcie_port *pp)
struct platform_device *pdev = to_platform_device(pp->dev);
struct pci_bus *bus, *child;
struct resource *cfg_res;
u32 val;
int i, ret;
LIST_HEAD(res);
struct resource_entry *win;
@ -544,25 +543,6 @@ int dw_pcie_host_init(struct pcie_port *pp)
if (pp->ops->host_init)
pp->ops->host_init(pp);
/*
* If the platform provides ->rd_other_conf, it means the platform
* uses its own address translation component rather than ATU, so
* we should not program the ATU here.
*/
if (!pp->ops->rd_other_conf)
dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX1,
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);
/* program correct class for RC */
dw_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
dw_pcie_rd_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, &val);
val |= PORT_LOGIC_SPEED_CHANGE;
dw_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val);
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,
@ -800,6 +780,25 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
dw_pcie_writel_rc(pp, val, PCI_COMMAND);
/*
* If the platform provides ->rd_other_conf, it means the platform
* uses its own address translation component rather than ATU, so
* we should not program the ATU here.
*/
if (!pp->ops->rd_other_conf)
dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX1,
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);
/* program correct class for RC */
dw_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
dw_pcie_rd_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, &val);
val |= PORT_LOGIC_SPEED_CHANGE;
dw_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val);
}
MODULE_AUTHOR("Jingoo Han <jg1.han@samsung.com>");