[PATCH v5 5/5] PCI: dwc: Add common send PME_Turn_Off message method

Frank Li
2024-03-19T16:07:38Z

Reserve space at end of first IORESOURCE_MEM window as message TLP MMIO
window. This space's size is 'region_align'.

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 | 94 ++++++++++++++++++++++-
drivers/pci/controller/dwc/pcie-designware.h | 3 +
2 files changed, 93 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 267687ab33cbc..d5723fce7a894 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -393,6 +393,31 @@ static int dw_pcie_msi_host_init(struct dw_pcie_rp *pp)
return 0;
}

+static void dw_pcie_host_request_msg_tlp_res(struct dw_pcie_rp *pp)
+{
+ struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+ struct resource_entry *win;
+ struct resource *res;
+
+ win = resource_list_first_type(&pp->bridge->windows, IORESOURCE_MEM);
+ if (win) {
+ res = devm_kzalloc(pci->dev, sizeof(*res), GFP_KERNEL);
+ if (!res)
+ return;
+
+ /* Reserve last region_align block as message TLP space */
+ res->start = win->res->end - pci->region_align + 1;
+ res->end = win->res->end;
+ res->name = "msg";
+ res->flags = win->res->flags | IORESOURCE_BUSY;
+
+ if (!request_resource(win->res, res))
+ pp->msg_res = res;
+ else
+ devm_kfree(pci->dev, res);
+ }
+}
+
int dw_pcie_host_init(struct dw_pcie_rp *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
@@ -479,6 +504,10 @@ int dw_pcie_host_init(struct dw_pcie_rp *pp)

dw_pcie_iatu_detect(pci);

+ /* Need call after dw_pcie_iatu_detect() before dw_pcie_setup_rc() */
+ if (pp->use_atu_msg)
+ dw_pcie_host_request_msg_tlp_res(pp);
+
ret = dw_pcie_edma_detect(pci);
if (ret)
goto err_free_msi;
@@ -536,6 +565,11 @@ void dw_pcie_host_deinit(struct dw_pcie_rp *pp)

dw_pcie_edma_remove(pci);

+ if (pp->msg_res) {
+ release_resource(pp->msg_res);
+ devm_kfree(pci->dev, pp->msg_res);
+ }
+
if (pp->has_msi_ctrl)
dw_pcie_free_msi(pp);

@@ -697,6 +731,10 @@ static int dw_pcie_iatu_setup(struct dw_pcie_rp *pp)
atu.pci_addr = entry->res->start - entry->offset;
atu.size = resource_size(entry->res);

+ /* MSG TLB window resource reserve at one of end of IORESOURCE_MEM resource */
+ if (pp->msg_res && pp->msg_res->parent == entry->res)
+ atu.size -= resource_size(pp->msg_res);
+
ret = dw_pcie_prog_outbound_atu(pci, &atu);
if (ret) {
dev_err(pci->dev, "Failed to set MEM range %pr\n",
@@ -728,6 +766,8 @@ 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);

+ pp->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 +873,54 @@ 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;
+
+ if (pci->num_ob_windows <= pci->pp.msg_atu_index)
+ return -EINVAL;
+
+ if (!pci->pp.msg_res)
+ 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 = resource_size(pci->pp.msg_res);
+ atu.index = pci->pp.msg_atu_index;
+
+ 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->pp.msg_res->start;
+
+ ret = dw_pcie_prog_outbound_atu(pci, &atu);
+ if (ret)
+ return ret;
+
+ m = ioremap(atu.cpu_addr, pci->region_align);
+ if (!m)
+ return -ENOMEM;
+
+ /* A dummy write is converted to a Msg TLP */
+ writel(0, m);
+
+ iounmap(m);
+
+ return 0;
+}
+
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 +932,13 @@ 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,
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 703b50bc5e0f1..dca5de4c6e877 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -341,6 +341,9 @@ struct dw_pcie_rp {
struct pci_host_bridge *bridge;
raw_spinlock_t lock;
DECLARE_BITMAP(msi_irq_in_use, MAX_MSI_IRQS);
+ bool use_atu_msg;
+ int msg_atu_index;
+ struct resource *msg_res;
};

struct dw_pcie_ep_ops {

--
2.34.1