[PATCH 6/8] PCI: rockchip: Fixed window mapping and address translation for endpoint

From: Rick Wertenbroek
Date: Thu Jan 26 2023 - 08:53:23 EST

Next message: Rick Wertenbroek: "[PATCH 7/8] PCI: rockchip: Fixed legacy IRQ generation for endpoint"
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In reply to: Rob Herring: "Re: [PATCH 5/8] PCI: rockchip: Added dtsi entry for PCIe endpoint controller"
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The RK3399 PCI EP core has 33 windows for PCIe space, here in the driver
up to 32 fixed size (1M) windows are used and pages are allocated /
mapped accordingly. The driver first used a single window and allocated
space inside which caused translation issues (between CPU space and PCI
space) because a window can only have a single translation at a given
time, which if multiple regions are allocated inside will cause conflicts.
Now each window is a single region of 1M which will always guarantee that
the translation is not in conflict.

Signed-off-by: Rick Wertenbroek <rick.wertenbroek@xxxxxxxxx>
---
drivers/pci/controller/pcie-rockchip-ep.c | 62 ++++++++++++-----------
drivers/pci/controller/pcie-rockchip.h | 25 ++++-----
2 files changed, 46 insertions(+), 41 deletions(-)

diff --git a/drivers/pci/controller/pcie-rockchip-ep.c b/drivers/pci/controller/pcie-rockchip-ep.c
index 4c84e403e..a682a941d 100644
--- a/drivers/pci/controller/pcie-rockchip-ep.c
+++ b/drivers/pci/controller/pcie-rockchip-ep.c
@@ -76,11 +76,17 @@ static void rockchip_pcie_prog_ep_ob_atu(struct rockchip_pcie *rockchip, u8 fn,
if (num_pass_bits < 8)
num_pass_bits = 8;

- cpu_addr -= rockchip->mem_res->start;
- addr0 = ((is_nor_msg ? 0x10 : (num_pass_bits - 1)) &
- PCIE_CORE_OB_REGION_ADDR0_NUM_BITS) |
- (lower_32_bits(cpu_addr) & PCIE_CORE_OB_REGION_ADDR0_LO_ADDR);
- addr1 = upper_32_bits(is_nor_msg ? cpu_addr : pci_addr);
+ if (is_nor_msg) {
+ dev_warn(rockchip->dev, "NOR MSG\n");
+ cpu_addr -= rockchip->mem_res->start;
+ addr0 = (0x10 & PCIE_CORE_OB_REGION_ADDR0_NUM_BITS) |
+ (lower_32_bits(cpu_addr) & PCIE_CORE_OB_REGION_ADDR0_LO_ADDR);
+ addr1 = upper_32_bits(cpu_addr);
+ } else {
+ addr0 = (num_pass_bits & PCIE_CORE_OB_REGION_ADDR0_NUM_BITS) |
+ (lower_32_bits(pci_addr) & PCIE_CORE_OB_REGION_ADDR0_LO_ADDR);
+ addr1 = upper_32_bits(pci_addr);
+ }
desc0 = ROCKCHIP_PCIE_AT_OB_REGION_DESC0_DEVFN(fn) | type;
desc1 = 0;

@@ -103,12 +109,6 @@ static void rockchip_pcie_prog_ep_ob_atu(struct rockchip_pcie *rockchip, u8 fn,
ROCKCHIP_PCIE_AT_OB_REGION_DESC0(r));
rockchip_pcie_write(rockchip, desc1,
ROCKCHIP_PCIE_AT_OB_REGION_DESC1(r));
-
- addr0 =
- ((num_pass_bits - 1) & PCIE_CORE_OB_REGION_ADDR0_NUM_BITS) |
- (lower_32_bits(cpu_addr) &
- PCIE_CORE_OB_REGION_ADDR0_LO_ADDR);
- addr1 = upper_32_bits(cpu_addr);
}
}

@@ -256,15 +256,7 @@ static int rockchip_pcie_ep_map_addr(struct pci_epc *epc, u8 fn, u8 vfn,
struct rockchip_pcie *pcie = &ep->rockchip;
u32 r;

- r = find_first_zero_bit(&ep->ob_region_map, BITS_PER_LONG);
- /*
- * Region 0 is reserved for configuration space and shouldn't
- * be used elsewhere per TRM, so leave it out.
- */
- if (r >= ep->max_regions - 1) {
- dev_err(&epc->dev, "no free outbound region\n");
- return -EINVAL;
- }
+ r = (addr >> ilog2(SZ_1M)) & 0x1f;

rockchip_pcie_prog_ep_ob_atu(pcie, fn, r, AXI_WRAPPER_MEM_WRITE, addr,
pci_addr, size);
@@ -282,15 +274,11 @@ static void rockchip_pcie_ep_unmap_addr(struct pci_epc *epc, u8 fn, u8 vfn,
struct rockchip_pcie *rockchip = &ep->rockchip;
u32 r;

- for (r = 0; r < ep->max_regions - 1; r++)
+ for (r = 0; r < ep->max_regions; r++)
if (ep->ob_addr[r] == addr)
break;

- /*
- * Region 0 is reserved for configuration space and shouldn't
- * be used elsewhere per TRM, so leave it out.
- */
- if (r == ep->max_regions - 1)
+ if (r == ep->max_regions)
return;

rockchip_pcie_clear_ep_ob_atu(rockchip, r);
@@ -539,6 +527,8 @@ static int rockchip_pcie_parse_ep_dt(struct rockchip_pcie *rockchip,
if (err < 0 || ep->max_regions > MAX_REGION_LIMIT)
ep->max_regions = MAX_REGION_LIMIT;

+ ep->ob_region_map = 0;
+
err = of_property_read_u8(dev->of_node, "max-functions",
&ep->epc->max_functions);
if (err < 0)
@@ -559,7 +549,10 @@ static int rockchip_pcie_ep_probe(struct platform_device *pdev)
struct rockchip_pcie *rockchip;
struct pci_epc *epc;
size_t max_regions;
+ struct pci_epc_mem_window *windows = NULL;
int err;
+ u32 cfg;
+ int i;

ep = devm_kzalloc(dev, sizeof(*ep), GFP_KERNEL);
if (!ep)
@@ -606,15 +599,26 @@ static int rockchip_pcie_ep_probe(struct platform_device *pdev)
/* Only enable function 0 by default */
rockchip_pcie_write(rockchip, BIT(0), PCIE_CORE_PHY_FUNC_CFG);

- err = pci_epc_mem_init(epc, rockchip->mem_res->start,
- resource_size(rockchip->mem_res), PAGE_SIZE);
+ windows = devm_kcalloc(dev, ep->max_regions, sizeof(struct pci_epc_mem_window), GFP_KERNEL);
+ if (!windows) {
+ err = -ENOMEM;
+ goto err_uninit_port;
+ }
+ for (i = 0; i < ep->max_regions; i++) {
+ windows[i].phys_base = rockchip->mem_res->start + (SZ_1M * i);
+ windows[i].size = SZ_1M;
+ windows[i].page_size = SZ_1M;
+ }
+ err = pci_epc_multi_mem_init(epc, windows, ep->max_regions);
+ devm_kfree(dev, windows);
+
if (err < 0) {
dev_err(dev, "failed to initialize the memory space\n");
goto err_uninit_port;
}

ep->irq_cpu_addr = pci_epc_mem_alloc_addr(epc, &ep->irq_phys_addr,
- SZ_128K);
+ SZ_1M);
if (!ep->irq_cpu_addr) {
dev_err(dev, "failed to reserve memory space for MSI\n");
err = -ENOMEM;
diff --git a/drivers/pci/controller/pcie-rockchip.h b/drivers/pci/controller/pcie-rockchip.h
index f3a5ff1cf..72e427a0f 100644
--- a/drivers/pci/controller/pcie-rockchip.h
+++ b/drivers/pci/controller/pcie-rockchip.h
@@ -134,6 +134,7 @@

#define PCIE_RC_RP_ATS_BASE 0x400000
#define PCIE_RC_CONFIG_NORMAL_BASE 0x800000
+#define PCIE_EP_PF_CONFIG_REGS_BASE 0x800000
#define PCIE_RC_CONFIG_BASE 0xa00000
#define PCIE_EP_CONFIG_BASE 0xa00000
#define PCIE_EP_CONFIG_DID_VID (PCIE_EP_CONFIG_BASE + 0x00)
@@ -228,13 +229,14 @@
#define ROCKCHIP_PCIE_EP_MSI_CTRL_MASK_MSI_CAP BIT(24)
#define ROCKCHIP_PCIE_EP_DUMMY_IRQ_ADDR 0x1
#define ROCKCHIP_PCIE_EP_PCI_LEGACY_IRQ_ADDR 0x3
-#define ROCKCHIP_PCIE_EP_FUNC_BASE(fn) (((fn) << 12) & GENMASK(19, 12))
+#define ROCKCHIP_PCIE_EP_FUNC_BASE(fn) \
+ (PCIE_EP_PF_CONFIG_REGS_BASE + (((fn) << 12) & GENMASK(19, 12)))
+#define ROCKCHIP_PCIE_EP_VIRT_FUNC_BASE(fn) \
+ (PCIE_EP_PF_CONFIG_REGS_BASE + 0x10000 + (((fn) << 12) & GENMASK(19, 12)))
#define ROCKCHIP_PCIE_AT_IB_EP_FUNC_BAR_ADDR0(fn, bar) \
- (PCIE_RC_RP_ATS_BASE + 0x0840 + (fn) * 0x0040 + (bar) * 0x0008)
+ (PCIE_CORE_AXI_CONF_BASE + 0x0828 + (fn) * 0x0040 + (bar) * 0x0008)
#define ROCKCHIP_PCIE_AT_IB_EP_FUNC_BAR_ADDR1(fn, bar) \
- (PCIE_RC_RP_ATS_BASE + 0x0844 + (fn) * 0x0040 + (bar) * 0x0008)
-#define ROCKCHIP_PCIE_AT_OB_REGION_PCI_ADDR0(r) \
- (PCIE_RC_RP_ATS_BASE + 0x0000 + ((r) & 0x1f) * 0x0020)
+ (PCIE_CORE_AXI_CONF_BASE + 0x082c + (fn) * 0x0040 + (bar) * 0x0008)
#define ROCKCHIP_PCIE_AT_OB_REGION_PCI_ADDR0_DEVFN_MASK GENMASK(19, 12)
#define ROCKCHIP_PCIE_AT_OB_REGION_PCI_ADDR0_DEVFN(devfn) \
(((devfn) << 12) & \
@@ -242,20 +244,19 @@
#define ROCKCHIP_PCIE_AT_OB_REGION_PCI_ADDR0_BUS_MASK GENMASK(27, 20)
#define ROCKCHIP_PCIE_AT_OB_REGION_PCI_ADDR0_BUS(bus) \
(((bus) << 20) & ROCKCHIP_PCIE_AT_OB_REGION_PCI_ADDR0_BUS_MASK)
+#define PCIE_RC_EP_ATR_OB_REGIONS_1_32 (PCIE_CORE_AXI_CONF_BASE + 0x0020)
+#define ROCKCHIP_PCIE_AT_OB_REGION_PCI_ADDR0(r) \
+ (PCIE_RC_EP_ATR_OB_REGIONS_1_32 + 0x0000 + ((r) & 0x1f) * 0x0020)
#define ROCKCHIP_PCIE_AT_OB_REGION_PCI_ADDR1(r) \
- (PCIE_RC_RP_ATS_BASE + 0x0004 + ((r) & 0x1f) * 0x0020)
+ (PCIE_RC_EP_ATR_OB_REGIONS_1_32 + 0x0004 + ((r) & 0x1f) * 0x0020)
#define ROCKCHIP_PCIE_AT_OB_REGION_DESC0_HARDCODED_RID BIT(23)
#define ROCKCHIP_PCIE_AT_OB_REGION_DESC0_DEVFN_MASK GENMASK(31, 24)
#define ROCKCHIP_PCIE_AT_OB_REGION_DESC0_DEVFN(devfn) \
(((devfn) << 24) & ROCKCHIP_PCIE_AT_OB_REGION_DESC0_DEVFN_MASK)
#define ROCKCHIP_PCIE_AT_OB_REGION_DESC0(r) \
- (PCIE_RC_RP_ATS_BASE + 0x0008 + ((r) & 0x1f) * 0x0020)
+ (PCIE_RC_EP_ATR_OB_REGIONS_1_32 + 0x0008 + ((r) & 0x1f) * 0x0020)
#define ROCKCHIP_PCIE_AT_OB_REGION_DESC1(r) \
- (PCIE_RC_RP_ATS_BASE + 0x000c + ((r) & 0x1f) * 0x0020)
-#define ROCKCHIP_PCIE_AT_OB_REGION_CPU_ADDR0(r) \
- (PCIE_RC_RP_ATS_BASE + 0x0018 + ((r) & 0x1f) * 0x0020)
-#define ROCKCHIP_PCIE_AT_OB_REGION_CPU_ADDR1(r) \
- (PCIE_RC_RP_ATS_BASE + 0x001c + ((r) & 0x1f) * 0x0020)
+ (PCIE_RC_EP_ATR_OB_REGIONS_1_32 + 0x000c + ((r) & 0x1f) * 0x0020)

#define ROCKCHIP_PCIE_CORE_EP_FUNC_BAR_CFG0(fn) \
(PCIE_CORE_CTRL_MGMT_BASE + 0x0240 + (fn) * 0x0008)
--
2.25.1

Next message: Rick Wertenbroek: "[PATCH 7/8] PCI: rockchip: Fixed legacy IRQ generation for endpoint"
Previous message: Rick Wertenbroek: "[PATCH 5/8] PCI: rockchip: Added dtsi entry for PCIe endpoint controller"
In reply to: Rob Herring: "Re: [PATCH 5/8] PCI: rockchip: Added dtsi entry for PCIe endpoint controller"
Next in thread: Rick Wertenbroek: "[PATCH 7/8] PCI: rockchip: Fixed legacy IRQ generation for endpoint"
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