Add support for triggering legacy IRQs by using outbound ATU.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
---
.../pci/controller/dwc/pcie-designware-ep.c | 66 +++++++++++++++++--
drivers/pci/controller/dwc/pcie-designware.c | 25 ++++---
drivers/pci/controller/dwc/pcie-designware.h | 12 +++-
3 files changed, 87 insertions(+), 16 deletions(-)
diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c
index 95efe14f1036..886483bf378b 100644
--- a/drivers/pci/controller/dwc/pcie-designware-ep.c
+++ b/drivers/pci/controller/dwc/pcie-designware-ep.c
@@ -6,6 +6,7 @@
* Author: Kishon Vijay Abraham I <kishon@xxxxxx>
*/
+#include <linux/delay.h>
#include <linux/of.h>
#include <linux/platform_device.h>
@@ -182,8 +183,8 @@ static int dw_pcie_ep_inbound_atu(struct dw_pcie_ep *ep, u8 func_no, int type,
return 0;
}
-static int dw_pcie_ep_outbound_atu(struct dw_pcie_ep *ep, u8 func_no,
- phys_addr_t phys_addr,
+static int dw_pcie_ep_outbound_atu(struct dw_pcie_ep *ep, u8 func_no, int type,
+ u8 code, u8 routing, phys_addr_t phys_addr,
u64 pci_addr, size_t size)
{
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
@@ -196,8 +197,9 @@ static int dw_pcie_ep_outbound_atu(struct dw_pcie_ep *ep, u8 func_no,
return -EINVAL;
}
- ret = dw_pcie_prog_ep_outbound_atu(pci, func_no, free_win, PCIE_ATU_TYPE_MEM,
- phys_addr, pci_addr, size);
+ ret = dw_pcie_prog_ep_outbound_atu(pci, func_no, free_win, type,
+ code, routing, phys_addr, pci_addr,
+ size);
if (ret)
return ret;
@@ -306,7 +308,8 @@ static int dw_pcie_ep_map_addr(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
struct dw_pcie_ep *ep = epc_get_drvdata(epc);
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
- ret = dw_pcie_ep_outbound_atu(ep, func_no, addr, pci_addr, size);
+ ret = dw_pcie_ep_outbound_atu(ep, func_no, PCIE_ATU_TYPE_MEM, 0, 0,
+ addr, pci_addr, size);
if (ret) {
dev_err(pci->dev, "Failed to enable address\n");
return ret;
@@ -479,11 +482,43 @@ static const struct pci_epc_ops epc_ops = {
.get_features = dw_pcie_ep_get_features,
};
+static int dw_pcie_ep_send_msg(struct dw_pcie_ep *ep, u8 func_no, u8 code,
+ u8 routing)
+{
+ struct pci_epc *epc = ep->epc;
+ int ret;
+
+ ret = dw_pcie_ep_outbound_atu(ep, func_no, PCIE_ATU_TYPE_MSG, code,
+ routing, ep->intx_mem_phys, 0,
+ epc->mem->window.page_size);
+ if (ret)
+ return ret;
+ writel(0, ep->intx_mem);
+ dw_pcie_ep_unmap_addr(epc, func_no, 0, ep->intx_mem_phys);
+
+ return 0;
+}
+
+static int __dw_pcie_ep_raise_legacy_irq(struct dw_pcie_ep *ep, u8 func_no,
+ int intx)
+{
+ int ret;
+
+ ret = dw_pcie_ep_send_msg(ep, func_no, PCIE_MSG_ASSERT_INTA + intx, 0x04);
+ if (ret)
+ return ret;
+ usleep_range(1000, 2000);
+ return dw_pcie_ep_send_msg(ep, func_no, PCIE_MSG_DEASSERT_INTA + intx, 0x04);
+}
+
int dw_pcie_ep_raise_legacy_irq(struct dw_pcie_ep *ep, u8 func_no)
{
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
struct device *dev = pci->dev;
+ if (ep->intx_by_atu)
+ return __dw_pcie_ep_raise_legacy_irq(ep, func_no, 0);
+
dev_err(dev, "EP cannot trigger legacy IRQs\n");
return -EINVAL;
@@ -617,6 +652,10 @@ void dw_pcie_ep_exit(struct dw_pcie_ep *ep)
dw_pcie_edma_remove(pci);
+ if (ep->intx_by_atu)
+ pci_epc_mem_free_addr(epc, ep->intx_mem_phys, ep->intx_mem,
+ epc->mem->window.page_size);
+
pci_epc_mem_free_addr(epc, ep->msi_mem_phys, ep->msi_mem,
epc->mem->window.page_size);
@@ -789,9 +828,19 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
goto err_exit_epc_mem;
}
+ if (ep->intx_by_atu) {
+ ep->intx_mem = pci_epc_mem_alloc_addr(epc, &ep->intx_mem_phys,
+ epc->mem->window.page_size);
+ if (!ep->intx_mem) {
+ ret = -ENOMEM;
+ dev_err(dev, "Failed to reserve memory for INTx\n");
+ goto err_free_epc_mem;
+ }
+ }
+
ret = dw_pcie_edma_detect(pci);
if (ret)
- goto err_free_epc_mem;
+ goto err_free_epc_mem_intx;
if (ep->ops->get_features) {
epc_features = ep->ops->get_features(ep);
@@ -808,6 +857,11 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep)
err_remove_edma:
dw_pcie_edma_remove(pci);
+err_free_epc_mem_intx:
+ if (ep->intx_by_atu)
+ pci_epc_mem_free_addr(epc, ep->intx_mem_phys, ep->intx_mem,
+ epc->mem->window.page_size);
+
err_free_epc_mem:
pci_epc_mem_free_addr(epc, ep->msi_mem_phys, ep->msi_mem,
epc->mem->window.page_size);
diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index 53a16b8b6ac2..b4315cf84340 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -465,8 +465,8 @@ static inline u32 dw_pcie_enable_ecrc(u32 val)
}
static int __dw_pcie_prog_outbound_atu(struct dw_pcie *pci, u8 func_no,
- int index, int type, u64 cpu_addr,
- u64 pci_addr, u64 size)
+ int index, int type, u8 code, u8 routing,
+ u64 cpu_addr, u64 pci_addr, u64 size)
{
u32 retries, val;
u64 limit_addr;
@@ -498,7 +498,7 @@ static int __dw_pcie_prog_outbound_atu(struct dw_pcie *pci, u8 func_no,
dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_UPPER_TARGET,
upper_32_bits(pci_addr));
- val = type | PCIE_ATU_FUNC_NUM(func_no);
+ val = type | routing | PCIE_ATU_FUNC_NUM(func_no);
if (upper_32_bits(limit_addr) > upper_32_bits(cpu_addr) &&
dw_pcie_ver_is_ge(pci, 460A))
val |= PCIE_ATU_INCREASE_REGION_SIZE;
@@ -506,7 +506,14 @@ static int __dw_pcie_prog_outbound_atu(struct dw_pcie *pci, u8 func_no,
val = dw_pcie_enable_ecrc(val);
dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_REGION_CTRL1, val);
- dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_REGION_CTRL2, PCIE_ATU_ENABLE);
+ if (code)
+ dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_REGION_CTRL2,
+ PCIE_ATU_ENABLE |
+ PCIE_ATU_INHIBIT_PAYLOAD |
+ PCIE_ATU_HEADER_SUB_ENABLE | code);
+ else
+ dw_pcie_writel_atu_ob(pci, index, PCIE_ATU_REGION_CTRL2,
+ PCIE_ATU_ENABLE);
/*
* Make sure ATU enable takes effect before any subsequent config
@@ -528,16 +535,16 @@ static int __dw_pcie_prog_outbound_atu(struct dw_pcie *pci, u8 func_no,
int dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
u64 cpu_addr, u64 pci_addr, u64 size)
{
- return __dw_pcie_prog_outbound_atu(pci, 0, index, type,
+ return __dw_pcie_prog_outbound_atu(pci, 0, index, type, 0, 0,
cpu_addr, pci_addr, size);
}
int dw_pcie_prog_ep_outbound_atu(struct dw_pcie *pci, u8 func_no, int index,
- int type, u64 cpu_addr, u64 pci_addr,
- u64 size)
+ int type, u8 code, u8 routing, u64 cpu_addr,
+ u64 pci_addr, u64 size)
{
- return __dw_pcie_prog_outbound_atu(pci, func_no, index, type,
- cpu_addr, pci_addr, size);
+ return __dw_pcie_prog_outbound_atu(pci, func_no, index, type, code,
+ routing, cpu_addr, pci_addr, size);
}
static inline u32 dw_pcie_readl_atu_ib(struct dw_pcie *pci, u32 index, u32 reg)
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index 79713ce075cc..1a6e7e9489ee 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -147,11 +147,14 @@
#define PCIE_ATU_TYPE_IO 0x2
#define PCIE_ATU_TYPE_CFG0 0x4
#define PCIE_ATU_TYPE_CFG1 0x5
+#define PCIE_ATU_TYPE_MSG 0x10
#define PCIE_ATU_TD BIT(8)
#define PCIE_ATU_FUNC_NUM(pf) ((pf) << 20)
#define PCIE_ATU_REGION_CTRL2 0x004
#define PCIE_ATU_ENABLE BIT(31)
#define PCIE_ATU_BAR_MODE_ENABLE BIT(30)
+#define PCIE_ATU_INHIBIT_PAYLOAD BIT(22)
+#define PCIE_ATU_HEADER_SUB_ENABLE BIT(21)
#define PCIE_ATU_FUNC_NUM_MATCH_EN BIT(19)
#define PCIE_ATU_LOWER_BASE 0x008
#define PCIE_ATU_UPPER_BASE 0x00C
@@ -244,6 +247,9 @@
/* Default eDMA LLP memory size */
#define DMA_LLP_MEM_SIZE PAGE_SIZE
+#define PCIE_MSG_ASSERT_INTA 0x20
+#define PCIE_MSG_DEASSERT_INTA 0x24
+
struct dw_pcie;
struct dw_pcie_rp;
struct dw_pcie_ep;
@@ -352,7 +358,10 @@ struct dw_pcie_ep {
unsigned long *ob_window_map;
void __iomem *msi_mem;
phys_addr_t msi_mem_phys;
+ void __iomem *intx_mem;
+ phys_addr_t intx_mem_phys;
struct pci_epf_bar *epf_bar[PCI_STD_NUM_BARS];
+ bool intx_by_atu;
};
struct dw_pcie_ops {
@@ -419,7 +428,8 @@ int dw_pcie_wait_for_link(struct dw_pcie *pci);
int dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index, int type,
u64 cpu_addr, u64 pci_addr, u64 size);
int dw_pcie_prog_ep_outbound_atu(struct dw_pcie *pci, u8 func_no, int index,
- int type, u64 cpu_addr, u64 pci_addr, u64 size);
+ int type, u8 code, u8 routing, u64 cpu_addr,
+ u64 pci_addr, u64 size);
int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, int index, int type,
u64 cpu_addr, u64 pci_addr, u64 size);
int dw_pcie_prog_ep_inbound_atu(struct dw_pcie *pci, u8 func_no, int index,
--
2.25.1
