[v3,6/6] PCI: dwc: Add common send PME_Turn_Off message method
Commit Message
Set outbound ATU map memory write to send PCI message. So one MMIO write
can trigger a PCI message, such as PME_Turn_Off.
Add common dwc_pme_turn_off() function.
Call dwc_pme_turn_off() to send out PME_Turn_Off message in general
dw_pcie_suspend_noirq() if there are not platform callback pme_turn_off()
exist.
Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
drivers/pci/controller/dwc/pcie-designware-host.c | 52 +++++++++++++++++++++--
drivers/pci/controller/dwc/pcie-designware.c | 8 ++++
drivers/pci/controller/dwc/pcie-designware.h | 3 ++
3 files changed, 59 insertions(+), 4 deletions(-)
@@ -728,6 +728,8 @@ static int dw_pcie_iatu_setup(struct dw_pcie_rp *pp)
dev_warn(pci->dev, "Ranges exceed outbound iATU size (%d)\n",
pci->num_ob_windows);
+ pci->msg_atu_index = i;
+
i = 0;
resource_list_for_each_entry(entry, &pp->bridge->dma_ranges) {
if (resource_type(entry->res) != IORESOURCE_MEM)
@@ -833,11 +835,50 @@ int dw_pcie_setup_rc(struct dw_pcie_rp *pp)
}
EXPORT_SYMBOL_GPL(dw_pcie_setup_rc);
+/* Using message outbound ATU to send out PME_Turn_Off message for dwc PCIe controller */
+static int dw_pcie_pme_turn_off(struct dw_pcie *pci)
+{
+ struct dw_pcie_ob_atu_cfg atu = { 0 };
+ void __iomem *m;
+ int ret = 0;
+
+ if (pci->num_ob_windows <= pci->msg_atu_index)
+ return -EINVAL;
+
+ atu.code = PCIE_MSG_CODE_PME_TURN_OFF;
+ atu.routing = PCIE_MSG_TYPE_R_BC;
+ atu.type = PCIE_ATU_TYPE_MSG;
+ atu.size = pci->msg_io_size;
+
+ if (!atu.size) {
+ dev_dbg(pci->dev,
+ "atu memory map windows is zero, please check 'msg' reg in dts\n");
+ return -ENOMEM;
+ }
+
+ atu.cpu_addr = pci->msg_io_base;
+
+ ret = dw_pcie_prog_outbound_atu(pci, &atu);
+ if (ret)
+ return ret;
+
+ m = ioremap(atu.cpu_addr, PAGE_SIZE);
+ if (!m)
+ return -ENOMEM;
+
+ /* A dummy write is converted to a Msg TLP */
+ writel(0, m);
+
+ iounmap(m);
+
+ return ret;
+}
+
int dw_pcie_suspend_noirq(struct dw_pcie *pci)
{
u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
u32 val;
- int ret;
+ int ret = 0;
/*
* If L1SS is supported, then do not put the link into L2 as some
@@ -849,10 +890,13 @@ int dw_pcie_suspend_noirq(struct dw_pcie *pci)
if (dw_pcie_get_ltssm(pci) <= DW_PCIE_LTSSM_DETECT_ACT)
return 0;
- if (!pci->pp.ops->pme_turn_off)
- return 0;
+ if (pci->pp.ops->pme_turn_off)
+ pci->pp.ops->pme_turn_off(&pci->pp);
+ else
+ ret = dw_pcie_pme_turn_off(pci);
- pci->pp.ops->pme_turn_off(&pci->pp);
+ if (ret)
+ return ret;
ret = read_poll_timeout(dw_pcie_get_ltssm, val, val == DW_PCIE_LTSSM_L2_IDLE,
PCIE_PME_TO_L2_TIMEOUT_US/10,
@@ -155,6 +155,14 @@ int dw_pcie_get_resources(struct dw_pcie *pci)
}
}
+ if (!pci->msg_io_base) {
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "msg");
+ if (res) {
+ pci->msg_io_base = res->start;
+ pci->msg_io_size = res->end - res->start + 1;
+ }
+ }
+
/* LLDD is supposed to manually switch the clocks and resets state */
if (dw_pcie_cap_is(pci, REQ_RES)) {
ret = dw_pcie_get_clocks(pci);
@@ -424,6 +424,9 @@ struct dw_pcie {
struct reset_control_bulk_data core_rsts[DW_PCIE_NUM_CORE_RSTS];
struct gpio_desc *pe_rst;
bool suspended;
+ int msg_atu_index;
+ phys_addr_t msg_io_base;
+ size_t msg_io_size;
};
#define to_dw_pcie_from_pp(port) container_of((port), struct dw_pcie, pp)