This patch adds support to the Cadence PCIe controller in endpoint mode.
drivers/pci/Makefile was previously patched so
drivers/pci/cadence/pcie-cadence-ep.o is linked after drivers/pci/endpoint
objects, otherwise the built-in pci-cadence-ep driver would be probed
before the PCI endpoint libraries would have been initialized, which would
result in a kernel crash: controllers_group would still be NULL when
devm_pci_epc_create() is called.
Signed-off-by: Cyrille Pitchen <cyrille.pitchen@xxxxxxxxxxxxxxxxxx>
---
drivers/pci/cadence/Kconfig | 9 +
drivers/pci/cadence/Makefile | 1 +
drivers/pci/cadence/pcie-cadence-ep.c | 531 ++++++++++++++++++++++++++++++++++
drivers/pci/cadence/pcie-cadence.c | 27 ++
drivers/pci/cadence/pcie-cadence.h | 114 ++++++++
5 files changed, 682 insertions(+)
create mode 100644 drivers/pci/cadence/pcie-cadence-ep.c
diff --git a/drivers/pci/cadence/Kconfig b/drivers/pci/cadence/Kconfig
index 0d15b40861e9..70aa03b86e0d 100644
--- a/drivers/pci/cadence/Kconfig
+++ b/drivers/pci/cadence/Kconfig
@@ -21,4 +21,13 @@ config PCIE_CADENCE_HOST
mode. This PCIe controller may be embedded into many different vendors
SoCs.
+config PCIE_CADENCE_EP
+ bool "Cadence PCIe endpoint controller"
+ depends on PCI_ENDPOINT
+ select PCIE_CADENCE
+ help
+ Say Y here if you want to support the Cadence PCIe controller in
+ endpoint mode. This PCIe controller may be embedded into many
+ different vendors SoCs.
+
endif # PCI_CADENCE
diff --git a/drivers/pci/cadence/Makefile b/drivers/pci/cadence/Makefile
index 589601a8ff89..719392b97998 100644
--- a/drivers/pci/cadence/Makefile
+++ b/drivers/pci/cadence/Makefile
@@ -1,3 +1,4 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_PCIE_CADENCE) += pcie-cadence.o
obj-$(CONFIG_PCIE_CADENCE_HOST) += pcie-cadence-host.o
+obj-$(CONFIG_PCIE_CADENCE_EP) += pcie-cadence-ep.o
diff --git a/drivers/pci/cadence/pcie-cadence-ep.c b/drivers/pci/cadence/pcie-cadence-ep.c
new file mode 100644
index 000000000000..d940f5fb4ca0
--- /dev/null
+++ b/drivers/pci/cadence/pcie-cadence-ep.c
@@ -0,0 +1,531 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2017 Cadence
+// Cadence PCIe endpoint controller driver.
+// Author: Cyrille Pitchen <cyrille.pitchen@xxxxxxxxxxxxxxxxxx>
+
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/pci-epc.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/sizes.h>
+
+#include "pcie-cadence.h"
+
+#define CDNS_PCIE_EP_MIN_APERTURE 128 /* 128 bytes */
+#define CDNS_PCIE_EP_IRQ_PCI_ADDR_NONE 0x1
+#define CDNS_PCIE_EP_IRQ_PCI_ADDR_LEGACY 0x3
+
+/**
+ * struct cdns_pcie_ep - private data for this PCIe endpoint controller driver
+ * @pcie: Cadence PCIe controller
+ * @max_regions: maximum number of regions supported by hardware
+ * @ob_region_map: bitmask of mapped outbound regions
+ * @ob_addr: base addresses in the AXI bus where the outbound regions start
+ * @irq_phys_addr: base address on the AXI bus where the MSI/legacy IRQ
+ * dedicated outbound regions is mapped.
+ * @irq_cpu_addr: base address in the CPU space where a write access triggers
+ * the sending of a memory write (MSI) / normal message (legacy
+ * IRQ) TLP through the PCIe bus.
+ * @irq_pci_addr: used to save the current mapping of the MSI/legacy IRQ
+ * dedicated outbound region.
+ * @irq_pending: bitmask of asserted legacy IRQs.
+ */
+struct cdns_pcie_ep {
+ struct cdns_pcie pcie;
+ u32 max_regions;
+ unsigned long ob_region_map;
+ phys_addr_t *ob_addr;
+ phys_addr_t irq_phys_addr;
+ void __iomem *irq_cpu_addr;
+ u64 irq_pci_addr;
+ u8 irq_pending;
+};
+
+static int cdns_pcie_ep_write_header(struct pci_epc *epc, u8 fn,
+ struct pci_epf_header *hdr)
+{
+ struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
+ struct cdns_pcie *pcie = &ep->pcie;
+
+ cdns_pcie_ep_fn_writew(pcie, fn, PCI_DEVICE_ID, hdr->deviceid);
+ cdns_pcie_ep_fn_writeb(pcie, fn, PCI_REVISION_ID, hdr->revid);
+ cdns_pcie_ep_fn_writeb(pcie, fn, PCI_CLASS_PROG, hdr->progif_code);
+ cdns_pcie_ep_fn_writew(pcie, fn, PCI_CLASS_DEVICE,
+ hdr->subclass_code | hdr->baseclass_code << 8);
+ cdns_pcie_ep_fn_writeb(pcie, fn, PCI_CACHE_LINE_SIZE,
+ hdr->cache_line_size);
+ cdns_pcie_ep_fn_writew(pcie, fn, PCI_SUBSYSTEM_ID, hdr->subsys_id);
+ cdns_pcie_ep_fn_writeb(pcie, fn, PCI_INTERRUPT_PIN, hdr->interrupt_pin);
+
+ /*
+ * Vendor ID can only be modified from function 0, all other functions
+ * use the same vendor ID as function 0.
+ * Besides, function 0 'enabled' bit is hard-wired to 1, only other
+ * functions can be enabled/disabled by software.
+ */
+ if (fn == 0) {
+ /* Update the vendor IDs. */
+ u32 id = CDNS_PCIE_LM_ID_VENDOR(hdr->vendorid) |
+ CDNS_PCIE_LM_ID_SUBSYS(hdr->subsys_vendor_id);
+
+ cdns_pcie_writel(pcie, CDNS_PCIE_LM_ID, id);
+ } else {
+ /* Enable this endpoint function. */
+ u32 cfg = cdns_pcie_readl(pcie, CDNS_PCIE_LM_EP_FUNC_CFG);
+
+ cfg |= BIT(fn);
+ cdns_pcie_writel(pcie, CDNS_PCIE_LM_EP_FUNC_CFG, cfg);
+ }
+
+ return 0;
+}
+
+static int cdns_pcie_ep_set_bar(struct pci_epc *epc, u8 fn, enum pci_barno bar,
+ dma_addr_t bar_phys, size_t size, int flags)
+{
+ struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
+ struct cdns_pcie *pcie = &ep->pcie;
+ u32 addr0, addr1, reg, cfg, b, aperture, ctrl;
+ u64 sz;
+
+ /* BAR size is 2^(aperture + 7) */
+ sz = max_t(size_t, size, CDNS_PCIE_EP_MIN_APERTURE);
+ sz = 1ULL << fls64(sz - 1);
+ aperture = ilog2(sz) - 7; /* 128B -> 0, 256B -> 1, 512B -> 2, ... */
+
+ if ((flags & PCI_BASE_ADDRESS_SPACE) == PCI_BASE_ADDRESS_SPACE_IO) {
+ ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_IO_32BITS;
+ } else {
+ bool is_prefetch = !!(flags & PCI_BASE_ADDRESS_MEM_PREFETCH);
+ bool is_64bits = sz > SZ_2G;
+
+ if (is_64bits && (bar & 1))
+ return -EINVAL;
+
+ if (is_64bits && is_prefetch)
+ ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_PREFETCH_MEM_64BITS;
+ else if (is_prefetch)
+ ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_PREFETCH_MEM_32BITS;
+ else if (is_64bits)
+ ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_MEM_64BITS;
+ else
+ ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_MEM_32BITS;
+ }
+
+ addr0 = lower_32_bits(bar_phys);
+ addr1 = upper_32_bits(bar_phys);
+ cdns_pcie_writel(pcie, CDNS_PCIE_AT_IB_EP_FUNC_BAR_ADDR0(fn, bar),
+ addr0);
+ cdns_pcie_writel(pcie, CDNS_PCIE_AT_IB_EP_FUNC_BAR_ADDR1(fn, bar),
+ addr1);
+
+ if (bar < BAR_4) {
+ reg = CDNS_PCIE_LM_EP_FUNC_BAR_CFG0(fn);
+ b = bar;
+ } else {
+ reg = CDNS_PCIE_LM_EP_FUNC_BAR_CFG1(fn);
+ b = bar - BAR_4;
+ }
+
+ cfg = cdns_pcie_readl(pcie, reg);
+ cfg &= ~(CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_APERTURE_MASK(b) |
+ CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL_MASK(b));
+ cfg |= (CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_APERTURE(b, aperture) |
+ CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL(b, ctrl));
+ cdns_pcie_writel(pcie, reg, cfg);
+
+ return 0;
+}
+
+static void cdns_pcie_ep_clear_bar(struct pci_epc *epc, u8 fn,
+ enum pci_barno bar)
+{
+ struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
+ struct cdns_pcie *pcie = &ep->pcie;
+ u32 reg, cfg, b, ctrl;
+
+ if (bar < BAR_4) {
+ reg = CDNS_PCIE_LM_EP_FUNC_BAR_CFG0(fn);
+ b = bar;
+ } else {
+ reg = CDNS_PCIE_LM_EP_FUNC_BAR_CFG1(fn);
+ b = bar - BAR_4;
+ }
+
+ ctrl = CDNS_PCIE_LM_BAR_CFG_CTRL_DISABLED;
+ cfg = cdns_pcie_readl(pcie, reg);
+ cfg &= ~(CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_APERTURE_MASK(b) |
+ CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL_MASK(b));
+ cfg |= CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL_MASK(ctrl);
+ cdns_pcie_writel(pcie, reg, cfg);
+
+ cdns_pcie_writel(pcie, CDNS_PCIE_AT_IB_EP_FUNC_BAR_ADDR0(fn, bar), 0);
+ cdns_pcie_writel(pcie, CDNS_PCIE_AT_IB_EP_FUNC_BAR_ADDR1(fn, bar), 0);
+}
+
+static int cdns_pcie_ep_map_addr(struct pci_epc *epc, u8 fn, phys_addr_t addr,
+ u64 pci_addr, size_t size)
+{
+ struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
+ struct cdns_pcie *pcie = &ep->pcie;
+ u32 r;
+
+ r = find_first_zero_bit(&ep->ob_region_map,
+ sizeof(ep->ob_region_map) * BITS_PER_LONG);
+ if (r >= ep->max_regions - 1) {
+ dev_err(&epc->dev, "no free outbound region\n");
+ return -EINVAL;
+ }
+
+ cdns_pcie_set_outbound_region(pcie, r, false, addr, pci_addr, size);
+
+ set_bit(r, &ep->ob_region_map);
+ ep->ob_addr[r] = addr;
+
+ return 0;
+}
+
+static void cdns_pcie_ep_unmap_addr(struct pci_epc *epc, u8 fn,
+ phys_addr_t addr)
+{
+ struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
+ struct cdns_pcie *pcie = &ep->pcie;
+ u32 r;
+
+ for (r = 0; r < ep->max_regions - 1; r++)
+ if (ep->ob_addr[r] == addr)
+ break;
+
+ if (r == ep->max_regions - 1)
+ return;
+
+ cdns_pcie_reset_outbound_region(pcie, r);
+
+ ep->ob_addr[r] = 0;
+ clear_bit(r, &ep->ob_region_map);
+}
+
+static int cdns_pcie_ep_set_msi(struct pci_epc *epc, u8 fn, u8 mmc)
+{
+ struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
+ struct cdns_pcie *pcie = &ep->pcie;
+ u32 cap = CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET;
+ u16 flags;
+
+ /* Validate the ID of the MSI Capability structure. */
+ if (cdns_pcie_ep_fn_readb(pcie, fn, cap) != PCI_CAP_ID_MSI)
+ return -EINVAL;
+
+ /*
+ * Set the Multiple Message Capable bitfield into the Message Control
+ * register.
+ */
+ flags = cdns_pcie_ep_fn_readw(pcie, fn, cap + PCI_MSI_FLAGS);
+ flags = (flags & ~PCI_MSI_FLAGS_QMASK) | (mmc << 1);
+ flags |= PCI_MSI_FLAGS_64BIT;
+ flags &= ~PCI_MSI_FLAGS_MASKBIT;
+ cdns_pcie_ep_fn_writew(pcie, fn, cap + PCI_MSI_FLAGS, flags);
+
+ return 0;
+}
+
+static int cdns_pcie_ep_get_msi(struct pci_epc *epc, u8 fn)
+{
+ struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
+ struct cdns_pcie *pcie = &ep->pcie;
+ u32 cap = CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET;
+ u16 flags, mmc, mme;
+
+ /* Validate the ID of the MSI Capability structure. */
+ if (cdns_pcie_ep_fn_readb(pcie, fn, cap) != PCI_CAP_ID_MSI)
+ return -EINVAL;
+
+ /* Validate that the MSI feature is actually enabled. */
+ flags = cdns_pcie_ep_fn_readw(pcie, fn, cap + PCI_MSI_FLAGS);
+ if (!(flags & PCI_MSI_FLAGS_ENABLE))
+ return -EINVAL;
+
+ /*
+ * Get the Multiple Message Enable bitfield from the Message Control
+ * register.
+ */
+ mmc = (flags & PCI_MSI_FLAGS_QMASK) >> 1;
+ mme = (flags & PCI_MSI_FLAGS_QSIZE) >> 4;
+
+ /*
+ * The Multiple Message Enable value should always be equal to or less
+ * than The Multiple Message Capable value.
+ */
+ if (mme > mmc)
+ mme = mmc;
+
+ /*
+ * There are up to 32 MSI: mme stores the number of enabled MSI as a
+ * power of two. Hence mme can't be geater than 5 (2^5 == 32).
+ */
+ if (mme > 5)
+ mme = 5;
+
+ return mme;
+}
+
+static void cdns_pcie_ep_assert_intx(struct cdns_pcie_ep *ep, u8 fn,
+ u8 intx, bool is_asserted)
+{
+ struct cdns_pcie *pcie = &ep->pcie;
+ u32 r = ep->max_regions - 1;
+ u32 offset;
+ u16 status;
+ u8 msg_code;
+
+ intx &= 3;
+
+ /* Set the outbound region if needed. */
+ if (unlikely(ep->irq_pci_addr != CDNS_PCIE_EP_IRQ_PCI_ADDR_LEGACY)) {
+ /* Last region was reserved for IRQ writes. */
+ cdns_pcie_set_outbound_region_for_normal_msg(pcie, r,
+ ep->irq_phys_addr);
+ ep->irq_pci_addr = CDNS_PCIE_EP_IRQ_PCI_ADDR_LEGACY;
+ }
+
+ if (is_asserted) {
+ ep->irq_pending |= BIT(intx);
+ msg_code = MSG_CODE_ASSERT_INTA + intx;
+ } else {
+ ep->irq_pending &= ~BIT(intx);
+ msg_code = MSG_CODE_DEASSERT_INTA + intx;
+ }
+
+ status = cdns_pcie_ep_fn_readw(pcie, fn, PCI_STATUS);
+ if (((status & PCI_STATUS_INTERRUPT) != 0) ^ (ep->irq_pending != 0)) {
+ status ^= PCI_STATUS_INTERRUPT;
+ cdns_pcie_ep_fn_writew(pcie, fn, PCI_STATUS, status);
+ }
+
+ offset = CDNS_PCIE_NORMAL_MSG_ROUTING(MSG_ROUTING_LOCAL) |
+ CDNS_PCIE_NORMAL_MSG_CODE(msg_code) |
+ CDNS_PCIE_MSG_NO_DATA;
+ writel(0, ep->irq_cpu_addr + offset);
+}
+
+static int cdns_pcie_ep_send_legacy_irq(struct cdns_pcie_ep *ep, u8 fn, u8 intx)
+{
+ u16 cmd;
+
+ cmd = cdns_pcie_ep_fn_readw(&ep->pcie, fn, PCI_COMMAND);
+ if (cmd & PCI_COMMAND_INTX_DISABLE)
+ return -EINVAL;
+
+ cdns_pcie_ep_assert_intx(ep, fn, intx, true);
+ /*
+ * The mdelay() value was taken from dra7xx_pcie_raise_legacy_irq()
+ * from drivers/pci/dwc/pci-dra7xx.c
+ */
+ mdelay(1);
+ cdns_pcie_ep_assert_intx(ep, fn, intx, false);
+ return 0;
+}
+
+static int cdns_pcie_ep_raise_irq(struct pci_epc *epc, u8 fn,
+ enum pci_epc_irq_type type, u8 interrupt_num)
+{
+ struct cdns_pcie_ep *ep = epc_get_drvdata(epc);
+ struct cdns_pcie *pcie = &ep->pcie;
+ u32 cap = CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET;
+ u16 flags, mmc, mme, data, data_mask;
+ u8 msi_count;
+ u64 pci_addr, pci_addr_mask = 0xff;
+
+ /* Handle legacy IRQ. */
+ if (type == PCI_EPC_IRQ_LEGACY)
+ return cdns_pcie_ep_send_legacy_irq(ep, fn, 0);
+
+ /* Otherwise MSI. */
+ if (type != PCI_EPC_IRQ_MSI)
+ return -EINVAL;
+
+ /* Check whether the MSI feature has been enabled by the PCI host. */
+ flags = cdns_pcie_ep_fn_readw(pcie, fn, cap + PCI_MSI_FLAGS);
+ if (!(flags & PCI_MSI_FLAGS_ENABLE))
+ return -EINVAL;
+
+ /* Get the number of enabled MSIs */
+ mmc = (flags & PCI_MSI_FLAGS_QMASK) >> 1;
+ mme = (flags & PCI_MSI_FLAGS_QSIZE) >> 4;
+
+ /*
+ * The Multiple Message Enable value should always be equal to or less
+ * than The Multiple Message Capable value.
+ */
+ if (mme > mmc)
+ mme = mmc;
+
+ /*
+ * There are up to 32 MSI: mme stores the number of enabled MSI as a
+ * power of two. Hence mme can't be geater than 5 (2^5 == 32).
+ */
+ if (mme > 5)
+ mme = 5;
+
+ msi_count = 1 << mme;
+ if (!interrupt_num || interrupt_num > msi_count)
+ return -EINVAL;
+
+ /* Compute the data value to be written. */
+ data_mask = msi_count - 1;
+ data = cdns_pcie_ep_fn_readw(pcie, fn, cap + PCI_MSI_DATA_64);
+ data = (data & ~data_mask) | ((interrupt_num - 1) & data_mask);
+
+ /* Get the PCI address where to write the data into. */
+ pci_addr = cdns_pcie_ep_fn_readl(pcie, fn, cap + PCI_MSI_ADDRESS_HI);
+ pci_addr <<= 32;
+ pci_addr |= cdns_pcie_ep_fn_readl(pcie, fn, cap + PCI_MSI_ADDRESS_LO);
+ pci_addr &= GENMASK_ULL(63, 2);
+
+ /* Set the outbound region if needed. */
+ if (unlikely(ep->irq_pci_addr != pci_addr)) {
+ /* Last region was reserved for IRQ writes. */
+ cdns_pcie_set_outbound_region(pcie, ep->max_regions - 1,
+ false,
+ ep->irq_phys_addr,
+ pci_addr & ~pci_addr_mask,
+ pci_addr_mask + 1);
+ ep->irq_pci_addr = pci_addr;
+ }
+ writew(data, ep->irq_cpu_addr + (pci_addr & pci_addr_mask));
+
+ return 0;
+}
+
+static int cdns_pcie_ep_start(struct pci_epc *epc)
+{
+ struct pci_epf *epf;
+
+ /*
+ * Already linked-up: don't call directly pci_epc_linkup() because we've
+ * already locked the epc->lock.
+ */
+ list_for_each_entry(epf, &epc->pci_epf, list)
+ pci_epf_linkup(epf);
+
+ return 0;
+}
+
+static const struct pci_epc_ops cdns_pcie_epc_ops = {
+ .write_header = cdns_pcie_ep_write_header,
+ .set_bar = cdns_pcie_ep_set_bar,
+ .clear_bar = cdns_pcie_ep_clear_bar,
+ .map_addr = cdns_pcie_ep_map_addr,
+ .unmap_addr = cdns_pcie_ep_unmap_addr,
+ .set_msi = cdns_pcie_ep_set_msi,
+ .get_msi = cdns_pcie_ep_get_msi,
+ .raise_irq = cdns_pcie_ep_raise_irq,
+ .start = cdns_pcie_ep_start,
+};
+
+static const struct of_device_id cdns_pcie_ep_of_match[] = {
+ { .compatible = "cdns,cdns-pcie-ep" },
+
+ { },
+};
+
+static int cdns_pcie_ep_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct cdns_pcie_ep *ep;
+ struct cdns_pcie *pcie;
+ struct pci_epc *epc;
+ struct resource *res;
+ int ret;
+
+ ep = devm_kzalloc(dev, sizeof(*ep), GFP_KERNEL);
+ if (!ep)
+ return -ENOMEM;
+
+ pcie = &ep->pcie;
+ pcie->is_rc = false;
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "reg");
+ pcie->reg_base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(pcie->reg_base)) {
+ dev_err(dev, "missing \"reg\"\n");
+ return PTR_ERR(pcie->reg_base);
+ }
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem");
+ if (!res) {
+ dev_err(dev, "missing \"mem\"\n");
+ return -EINVAL;
+ }
+ pcie->mem_res = res;
+
+ ep->max_regions = 32;
+ of_property_read_u32(np, "cdns,max-outbound-regions", &ep->max_regions);
+ ep->ob_addr = devm_kzalloc(dev, ep->max_regions * sizeof(*ep->ob_addr),
+ GFP_KERNEL);
+ if (!ep->ob_addr)
+ return -ENOMEM;
+
+ pm_runtime_enable(dev);
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0) {
+ dev_err(dev, "pm_runtime_get_sync() failed\n");
+ goto err_get_sync;
+ }
+
+ /* Disable all but function 0 (anyway BIT(0) is hardwired to 1). */
+ cdns_pcie_writel(pcie, CDNS_PCIE_LM_EP_FUNC_CFG, BIT(0));
+
+ epc = devm_pci_epc_create(dev, &cdns_pcie_epc_ops);
+ if (IS_ERR(epc)) {
+ dev_err(dev, "failed to create epc device\n");
+ ret = PTR_ERR(epc);
+ goto err_init;
+ }
+
+ epc_set_drvdata(epc, ep);
+
+ epc->max_functions = 1;
+ of_property_read_u8(np, "max-functions", &epc->max_functions);
+
+ ret = pci_epc_mem_init(epc, pcie->mem_res->start,
+ resource_size(pcie->mem_res));
+ if (ret < 0) {
+ dev_err(dev, "failed to initialize the memory space\n");
+ goto err_init;
+ }
+
+ ep->irq_cpu_addr = pci_epc_mem_alloc_addr(epc, &ep->irq_phys_addr,
+ SZ_128K);
+ if (!ep->irq_cpu_addr) {
+ dev_err(dev, "failed to reserve memory space for MSI\n");
+ ret = -ENOMEM;
+ goto free_epc_mem;
+ }
+ ep->irq_pci_addr = CDNS_PCIE_EP_IRQ_PCI_ADDR_NONE;
+
+ return 0;
+
+ free_epc_mem:
+ pci_epc_mem_exit(epc);
+
+ err_init:
+ pm_runtime_put_sync(dev);
+
+ err_get_sync:
+ pm_runtime_disable(dev);
+
+ return ret;
+}
+
+static struct platform_driver cdns_pcie_ep_driver = {
+ .driver = {
+ .name = "cdns-pcie-ep",
+ .of_match_table = cdns_pcie_ep_of_match,
+ },
+ .probe = cdns_pcie_ep_probe,
+};
+builtin_platform_driver(cdns_pcie_ep_driver);
diff --git a/drivers/pci/cadence/pcie-cadence.c b/drivers/pci/cadence/pcie-cadence.c
index 5c76e7f4c5f9..7b91147ce68e 100644
--- a/drivers/pci/cadence/pcie-cadence.c
+++ b/drivers/pci/cadence/pcie-cadence.c
@@ -55,6 +55,33 @@ void cdns_pcie_set_outbound_region(struct cdns_pcie *pcie, u32 r, bool is_io,
cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR1(r), addr1);
}
+void cdns_pcie_set_outbound_region_for_normal_msg(struct cdns_pcie *pcie, u32 r,
+ u64 cpu_addr)
+{
+ u32 addr0, addr1, desc0, desc1;
+
+ desc0 = CDNS_PCIE_AT_OB_REGION_DESC0_TYPE_NORMAL_MSG;
+ desc1 = 0;
+ if (pcie->is_rc) {
+ desc0 |= CDNS_PCIE_AT_OB_REGION_DESC0_HARDCODED_RID |
+ CDNS_PCIE_AT_OB_REGION_DESC0_DEVFN(0);
+ desc1 |= CDNS_PCIE_AT_OB_REGION_DESC1_BUS(pcie->bus);
+ }
+
+ /* Set the CPU address */
+ cpu_addr -= pcie->mem_res->start;
+ addr0 = CDNS_PCIE_AT_OB_REGION_CPU_ADDR0_NBITS(17) |
+ (lower_32_bits(cpu_addr) & GENMASK(31, 8));
+ addr1 = upper_32_bits(cpu_addr);
+
+ cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_PCI_ADDR0(r), 0);
+ cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_PCI_ADDR1(r), 0);
+ cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_DESC0(r), desc0);
+ cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_DESC1(r), desc1);
+ cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR0(r), addr0);
+ cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_CPU_ADDR1(r), addr1);
+}
+
void cdns_pcie_reset_outbound_region(struct cdns_pcie *pcie, u32 r)
{
cdns_pcie_writel(pcie, CDNS_PCIE_AT_OB_REGION_PCI_ADDR0(r), 0);
diff --git a/drivers/pci/cadence/pcie-cadence.h b/drivers/pci/cadence/pcie-cadence.h
index 3a15b4016352..7e36c81f783d 100644
--- a/drivers/pci/cadence/pcie-cadence.h
+++ b/drivers/pci/cadence/pcie-cadence.h
@@ -32,6 +32,30 @@
#define CDNS_PCIE_LM_RP_RID_(rid) \
(((rid) << CDNS_PCIE_LM_RP_RID_SHIFT) & CDNS_PCIE_LM_RP_RID_MASK)
+/* Endpoint Bus and Device Number Register */
+#define CDNS_PCIE_LM_EP_ID (CDNS_PCIE_LM_BASE + 0x022c)
+#define CDNS_PCIE_LM_EP_ID_DEV_MASK GENMASK(4, 0)
+#define CDNS_PCIE_LM_EP_ID_DEV_SHIFT 0
+#define CDNS_PCIE_LM_EP_ID_BUS_MASK GENMASK(15, 8)
+#define CDNS_PCIE_LM_EP_ID_BUS_SHIFT 8
+
+/* Endpoint Function f BAR b Configuration Registers */
+#define CDNS_PCIE_LM_EP_FUNC_BAR_CFG0(fn) \
+ (CDNS_PCIE_LM_BASE + 0x0240 + (fn) * 0x0008)
+#define CDNS_PCIE_LM_EP_FUNC_BAR_CFG1(fn) \
+ (CDNS_PCIE_LM_BASE + 0x0244 + (fn) * 0x0008)
+#define CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_APERTURE_MASK(b) \
+ (GENMASK(4, 0) << ((b) * 8))
+#define CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_APERTURE(b, a) \
+ (((a) << ((b) * 8)) & CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_APERTURE_MASK(b))
+#define CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL_MASK(b) \
+ (GENMASK(7, 5) << ((b) * 8))
+#define CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL(b, c) \
+ (((c) << ((b) * 8 + 5)) & CDNS_PCIE_LM_EP_FUNC_BAR_CFG_BAR_CTRL_MASK(b))
+
+/* Endpoint Function Configuration Register */
+#define CDNS_PCIE_LM_EP_FUNC_CFG (CDNS_PCIE_LM_BASE + 0x02c0)
+
/* Root Complex BAR Configuration Register */
#define CDNS_PCIE_LM_RC_BAR_CFG (CDNS_PCIE_LM_BASE + 0x0300)
#define CDNS_PCIE_LM_RC_BAR_CFG_BAR0_APERTURE_MASK GENMASK(5, 0)
@@ -64,6 +88,13 @@
/*
+ * Endpoint Function Registers (PCI configuration space for endpoint functions)
+ */
+#define CDNS_PCIE_EP_FUNC_BASE(fn) (((fn) << 12) & GENMASK(19, 12))
+
+#define CDNS_PCIE_EP_FUNC_MSI_CAP_OFFSET 0x90
+
+/*
* Root Port Registers (PCI configuration space for the root port function)
*/
#define CDNS_PCIE_RP_BASE 0x00200000
@@ -140,6 +171,52 @@ enum cdns_pcie_rp_bar {
RP_NO_BAR
};
+/* Endpoint Function BAR Inbound PCIe to AXI Address Translation Register */
+#define CDNS_PCIE_AT_IB_EP_FUNC_BAR_ADDR0(fn, bar) \
+ (CDNS_PCIE_AT_BASE + 0x0840 + (fn) * 0x0040 + (bar) * 0x0008)
+#define CDNS_PCIE_AT_IB_EP_FUNC_BAR_ADDR1(fn, bar) \
+ (CDNS_PCIE_AT_BASE + 0x0844 + (fn) * 0x0040 + (bar) * 0x0008)
+
+/* Normal/Vendor specific message access: offset inside some outbound region */
+#define CDNS_PCIE_NORMAL_MSG_ROUTING_MASK GENMASK(7, 5)
+#define CDNS_PCIE_NORMAL_MSG_ROUTING(route) \
+ (((route) << 5) & CDNS_PCIE_NORMAL_MSG_ROUTING_MASK)
+#define CDNS_PCIE_NORMAL_MSG_CODE_MASK GENMASK(15, 8)
+#define CDNS_PCIE_NORMAL_MSG_CODE(code) \
+ (((code) << 8) & CDNS_PCIE_NORMAL_MSG_CODE_MASK)
+#define CDNS_PCIE_MSG_NO_DATA BIT(16)
+
+enum cdns_pcie_msg_code {
+ MSG_CODE_ASSERT_INTA = 0x20,
+ MSG_CODE_ASSERT_INTB = 0x21,
+ MSG_CODE_ASSERT_INTC = 0x22,
+ MSG_CODE_ASSERT_INTD = 0x23,
+ MSG_CODE_DEASSERT_INTA = 0x24,
+ MSG_CODE_DEASSERT_INTB = 0x25,
+ MSG_CODE_DEASSERT_INTC = 0x26,
+ MSG_CODE_DEASSERT_INTD = 0x27,
+};
+
+enum cdns_pcie_msg_routing {
+ /* Route to Root Complex */
+ MSG_ROUTING_TO_RC,
+
+ /* Use Address Routing */
+ MSG_ROUTING_BY_ADDR,
+
+ /* Use ID Routing */
+ MSG_ROUTING_BY_ID,
+
+ /* Route as Broadcast Message from Root Complex */
+ MSG_ROUTING_BCAST,
+
+ /* Local message; terminate at receiver (INTx messages) */
+ MSG_ROUTING_LOCAL,
+
+ /* Gather & route to Root Complex (PME_TO_Ack message) */
+ MSG_ROUTING_GATHER,
+};
+
/**
* struct cdns_pcie - private data for Cadence PCIe controller drivers
* @reg_base: IO mapped register base
@@ -188,9 +265,46 @@ static inline void cdns_pcie_rp_writew(struct cdns_pcie *pcie,
writew(value, pcie->reg_base + CDNS_PCIE_RP_BASE + reg);
}
+/* Endpoint Function register access */
+static inline void cdns_pcie_ep_fn_writeb(struct cdns_pcie *pcie, u8 fn,
+ u32 reg, u8 value)
+{
+ writeb(value, pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg);
+}
+
+static inline void cdns_pcie_ep_fn_writew(struct cdns_pcie *pcie, u8 fn,
+ u32 reg, u16 value)
+{
+ writew(value, pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg);
+}
+
+static inline void cdns_pcie_ep_fn_writel(struct cdns_pcie *pcie, u8 fn,
+ u32 reg, u16 value)
+{
+ writel(value, pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg);
+}
+
+static inline u8 cdns_pcie_ep_fn_readb(struct cdns_pcie *pcie, u8 fn, u32 reg)
+{
+ return readb(pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg);
+}
+
+static inline u16 cdns_pcie_ep_fn_readw(struct cdns_pcie *pcie, u8 fn, u32 reg)
+{
+ return readw(pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg);
+}
+
+static inline u32 cdns_pcie_ep_fn_readl(struct cdns_pcie *pcie, u8 fn, u32 reg)
+{
+ return readl(pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg);
+}
+
void cdns_pcie_set_outbound_region(struct cdns_pcie *pcie, u32 r, bool is_io,
u64 cpu_addr, u64 pci_addr, size_t size);
+void cdns_pcie_set_outbound_region_for_normal_msg(struct cdns_pcie *pcie, u32 r,
+ u64 cpu_addr);
+
void cdns_pcie_reset_outbound_region(struct cdns_pcie *pcie, u32 r);
#endif /* _PCIE_CADENCE_H */
--
2.11.0
--
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