This is a note to let you know that I've just added the patch titled
PCI: microchip: Add support for using either Root Port 1 or 2
to the 6.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
pci-microchip-add-support-for-using-either-root-port.patch
and it can be found in the queue-6.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 42c25b386c2403fba121ac844039b35f51c67c1d
Author: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
Date: Thu Nov 7 10:59:35 2024 +0000
PCI: microchip: Add support for using either Root Port 1 or 2
[ Upstream commit ac7f53b7e7283fee35ad12de8359f20989a47eb5 ]
The PCI host controller on PolarFire SoC has multiple Root Port instances,
each with their own bridge and ctrl address spaces. The original binding
has an "apb" register region, and it is expected to be set to the base
address of the Root Complex register space. Some defines in the Linux
driver were used to compute the addresses of the bridge and ctrl address
ranges corresponding to Root Port instance 1. Some customers want to use
Root Port instance 2 however, which requires changing the defines in the
driver, which is clearly not a portable solution.
The binding has been changed from a single register region to a pair,
corresponding to the bridge and ctrl regions respectively, so modify the
driver to read these regions directly from the devicetree rather than
compute them from the base address of the abp region.
To maintain backwards compatibility with the existing binding, the driver
retains code to handle the "abp" reg and computes the base address of the
bridge and ctrl regions using the defines if it is present. reg-names has
always been a required property, so this is safe to do.
Link: https://lore.kernel.org/r/20241107-surrender-brisket-287d563a5de1@spud
Signed-off-by: Conor Dooley <conor.dooley@xxxxxxxxxxxxx>
[bhelgaas: Capitalize PCIe spec terms]
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Stable-dep-of: 1390a33b3d04 ("PCI: microchip: Set inbound address translation for coherent or non-coherent mode")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/pci/controller/plda/pcie-microchip-host.c b/drivers/pci/controller/plda/pcie-microchip-host.c
index 48f60a04b740b..6630cacef3010 100644
--- a/drivers/pci/controller/plda/pcie-microchip-host.c
+++ b/drivers/pci/controller/plda/pcie-microchip-host.c
@@ -25,9 +25,6 @@
#define MC_PCIE1_BRIDGE_ADDR 0x00008000u
#define MC_PCIE1_CTRL_ADDR 0x0000a000u
-#define MC_PCIE_BRIDGE_ADDR (MC_PCIE1_BRIDGE_ADDR)
-#define MC_PCIE_CTRL_ADDR (MC_PCIE1_CTRL_ADDR)
-
/* PCIe Controller Phy Regs */
#define SEC_ERROR_EVENT_CNT 0x20
#define DED_ERROR_EVENT_CNT 0x24
@@ -128,7 +125,6 @@
[EVENT_LOCAL_ ## x] = { __stringify(x), s }
#define PCIE_EVENT(x) \
- .base = MC_PCIE_CTRL_ADDR, \
.offset = PCIE_EVENT_INT, \
.mask_offset = PCIE_EVENT_INT, \
.mask_high = 1, \
@@ -136,7 +132,6 @@
.enb_mask = PCIE_EVENT_INT_ENB_MASK
#define SEC_EVENT(x) \
- .base = MC_PCIE_CTRL_ADDR, \
.offset = SEC_ERROR_INT, \
.mask_offset = SEC_ERROR_INT_MASK, \
.mask = SEC_ERROR_INT_ ## x ## _INT, \
@@ -144,7 +139,6 @@
.enb_mask = 0
#define DED_EVENT(x) \
- .base = MC_PCIE_CTRL_ADDR, \
.offset = DED_ERROR_INT, \
.mask_offset = DED_ERROR_INT_MASK, \
.mask_high = 1, \
@@ -152,7 +146,6 @@
.enb_mask = 0
#define LOCAL_EVENT(x) \
- .base = MC_PCIE_BRIDGE_ADDR, \
.offset = ISTATUS_LOCAL, \
.mask_offset = IMASK_LOCAL, \
.mask_high = 0, \
@@ -179,7 +172,8 @@ struct event_map {
struct mc_pcie {
struct plda_pcie_rp plda;
- void __iomem *axi_base_addr;
+ void __iomem *bridge_base_addr;
+ void __iomem *ctrl_base_addr;
};
struct cause {
@@ -253,7 +247,6 @@ static struct event_map local_status_to_event[] = {
};
static struct {
- u32 base;
u32 offset;
u32 mask;
u32 shift;
@@ -325,8 +318,7 @@ static inline u32 reg_to_event(u32 reg, struct event_map field)
static u32 pcie_events(struct mc_pcie *port)
{
- void __iomem *ctrl_base_addr = port->axi_base_addr + MC_PCIE_CTRL_ADDR;
- u32 reg = readl_relaxed(ctrl_base_addr + PCIE_EVENT_INT);
+ u32 reg = readl_relaxed(port->ctrl_base_addr + PCIE_EVENT_INT);
u32 val = 0;
int i;
@@ -338,8 +330,7 @@ static u32 pcie_events(struct mc_pcie *port)
static u32 sec_errors(struct mc_pcie *port)
{
- void __iomem *ctrl_base_addr = port->axi_base_addr + MC_PCIE_CTRL_ADDR;
- u32 reg = readl_relaxed(ctrl_base_addr + SEC_ERROR_INT);
+ u32 reg = readl_relaxed(port->ctrl_base_addr + SEC_ERROR_INT);
u32 val = 0;
int i;
@@ -351,8 +342,7 @@ static u32 sec_errors(struct mc_pcie *port)
static u32 ded_errors(struct mc_pcie *port)
{
- void __iomem *ctrl_base_addr = port->axi_base_addr + MC_PCIE_CTRL_ADDR;
- u32 reg = readl_relaxed(ctrl_base_addr + DED_ERROR_INT);
+ u32 reg = readl_relaxed(port->ctrl_base_addr + DED_ERROR_INT);
u32 val = 0;
int i;
@@ -364,8 +354,7 @@ static u32 ded_errors(struct mc_pcie *port)
static u32 local_events(struct mc_pcie *port)
{
- void __iomem *bridge_base_addr = port->axi_base_addr + MC_PCIE_BRIDGE_ADDR;
- u32 reg = readl_relaxed(bridge_base_addr + ISTATUS_LOCAL);
+ u32 reg = readl_relaxed(port->bridge_base_addr + ISTATUS_LOCAL);
u32 val = 0;
int i;
@@ -412,8 +401,12 @@ static void mc_ack_event_irq(struct irq_data *data)
void __iomem *addr;
u32 mask;
- addr = mc_port->axi_base_addr + event_descs[event].base +
- event_descs[event].offset;
+ if (event_descs[event].offset == ISTATUS_LOCAL)
+ addr = mc_port->bridge_base_addr;
+ else
+ addr = mc_port->ctrl_base_addr;
+
+ addr += event_descs[event].offset;
mask = event_descs[event].mask;
mask |= event_descs[event].enb_mask;
@@ -429,8 +422,12 @@ static void mc_mask_event_irq(struct irq_data *data)
u32 mask;
u32 val;
- addr = mc_port->axi_base_addr + event_descs[event].base +
- event_descs[event].mask_offset;
+ if (event_descs[event].offset == ISTATUS_LOCAL)
+ addr = mc_port->bridge_base_addr;
+ else
+ addr = mc_port->ctrl_base_addr;
+
+ addr += event_descs[event].mask_offset;
mask = event_descs[event].mask;
if (event_descs[event].enb_mask) {
mask <<= PCIE_EVENT_INT_ENB_SHIFT;
@@ -460,8 +457,12 @@ static void mc_unmask_event_irq(struct irq_data *data)
u32 mask;
u32 val;
- addr = mc_port->axi_base_addr + event_descs[event].base +
- event_descs[event].mask_offset;
+ if (event_descs[event].offset == ISTATUS_LOCAL)
+ addr = mc_port->bridge_base_addr;
+ else
+ addr = mc_port->ctrl_base_addr;
+
+ addr += event_descs[event].mask_offset;
mask = event_descs[event].mask;
if (event_descs[event].enb_mask)
@@ -554,26 +555,20 @@ static const struct plda_event mc_event = {
static inline void mc_clear_secs(struct mc_pcie *port)
{
- void __iomem *ctrl_base_addr = port->axi_base_addr + MC_PCIE_CTRL_ADDR;
-
- writel_relaxed(SEC_ERROR_INT_ALL_RAM_SEC_ERR_INT, ctrl_base_addr +
- SEC_ERROR_INT);
- writel_relaxed(0, ctrl_base_addr + SEC_ERROR_EVENT_CNT);
+ writel_relaxed(SEC_ERROR_INT_ALL_RAM_SEC_ERR_INT,
+ port->ctrl_base_addr + SEC_ERROR_INT);
+ writel_relaxed(0, port->ctrl_base_addr + SEC_ERROR_EVENT_CNT);
}
static inline void mc_clear_deds(struct mc_pcie *port)
{
- void __iomem *ctrl_base_addr = port->axi_base_addr + MC_PCIE_CTRL_ADDR;
-
- writel_relaxed(DED_ERROR_INT_ALL_RAM_DED_ERR_INT, ctrl_base_addr +
- DED_ERROR_INT);
- writel_relaxed(0, ctrl_base_addr + DED_ERROR_EVENT_CNT);
+ writel_relaxed(DED_ERROR_INT_ALL_RAM_DED_ERR_INT,
+ port->ctrl_base_addr + DED_ERROR_INT);
+ writel_relaxed(0, port->ctrl_base_addr + DED_ERROR_EVENT_CNT);
}
static void mc_disable_interrupts(struct mc_pcie *port)
{
- void __iomem *bridge_base_addr = port->axi_base_addr + MC_PCIE_BRIDGE_ADDR;
- void __iomem *ctrl_base_addr = port->axi_base_addr + MC_PCIE_CTRL_ADDR;
u32 val;
/* Ensure ECC bypass is enabled */
@@ -581,22 +576,22 @@ static void mc_disable_interrupts(struct mc_pcie *port)
ECC_CONTROL_RX_RAM_ECC_BYPASS |
ECC_CONTROL_PCIE2AXI_RAM_ECC_BYPASS |
ECC_CONTROL_AXI2PCIE_RAM_ECC_BYPASS;
- writel_relaxed(val, ctrl_base_addr + ECC_CONTROL);
+ writel_relaxed(val, port->ctrl_base_addr + ECC_CONTROL);
/* Disable SEC errors and clear any outstanding */
- writel_relaxed(SEC_ERROR_INT_ALL_RAM_SEC_ERR_INT, ctrl_base_addr +
- SEC_ERROR_INT_MASK);
+ writel_relaxed(SEC_ERROR_INT_ALL_RAM_SEC_ERR_INT,
+ port->ctrl_base_addr + SEC_ERROR_INT_MASK);
mc_clear_secs(port);
/* Disable DED errors and clear any outstanding */
- writel_relaxed(DED_ERROR_INT_ALL_RAM_DED_ERR_INT, ctrl_base_addr +
- DED_ERROR_INT_MASK);
+ writel_relaxed(DED_ERROR_INT_ALL_RAM_DED_ERR_INT,
+ port->ctrl_base_addr + DED_ERROR_INT_MASK);
mc_clear_deds(port);
/* Disable local interrupts and clear any outstanding */
- writel_relaxed(0, bridge_base_addr + IMASK_LOCAL);
- writel_relaxed(GENMASK(31, 0), bridge_base_addr + ISTATUS_LOCAL);
- writel_relaxed(GENMASK(31, 0), bridge_base_addr + ISTATUS_MSI);
+ writel_relaxed(0, port->bridge_base_addr + IMASK_LOCAL);
+ writel_relaxed(GENMASK(31, 0), port->bridge_base_addr + ISTATUS_LOCAL);
+ writel_relaxed(GENMASK(31, 0), port->bridge_base_addr + ISTATUS_MSI);
/* Disable PCIe events and clear any outstanding */
val = PCIE_EVENT_INT_L2_EXIT_INT |
@@ -605,11 +600,11 @@ static void mc_disable_interrupts(struct mc_pcie *port)
PCIE_EVENT_INT_L2_EXIT_INT_MASK |
PCIE_EVENT_INT_HOTRST_EXIT_INT_MASK |
PCIE_EVENT_INT_DLUP_EXIT_INT_MASK;
- writel_relaxed(val, ctrl_base_addr + PCIE_EVENT_INT);
+ writel_relaxed(val, port->ctrl_base_addr + PCIE_EVENT_INT);
/* Disable host interrupts and clear any outstanding */
- writel_relaxed(0, bridge_base_addr + IMASK_HOST);
- writel_relaxed(GENMASK(31, 0), bridge_base_addr + ISTATUS_HOST);
+ writel_relaxed(0, port->bridge_base_addr + IMASK_HOST);
+ writel_relaxed(GENMASK(31, 0), port->bridge_base_addr + ISTATUS_HOST);
}
static int mc_platform_init(struct pci_config_window *cfg)
@@ -617,12 +612,10 @@ static int mc_platform_init(struct pci_config_window *cfg)
struct device *dev = cfg->parent;
struct platform_device *pdev = to_platform_device(dev);
struct pci_host_bridge *bridge = platform_get_drvdata(pdev);
- void __iomem *bridge_base_addr =
- port->axi_base_addr + MC_PCIE_BRIDGE_ADDR;
int ret;
/* Configure address translation table 0 for PCIe config space */
- plda_pcie_setup_window(bridge_base_addr, 0, cfg->res.start,
+ plda_pcie_setup_window(port->bridge_base_addr, 0, cfg->res.start,
cfg->res.start,
resource_size(&cfg->res));
@@ -649,7 +642,7 @@ static int mc_platform_init(struct pci_config_window *cfg)
static int mc_host_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
- void __iomem *bridge_base_addr;
+ void __iomem *apb_base_addr;
struct plda_pcie_rp *plda;
int ret;
u32 val;
@@ -661,30 +654,45 @@ static int mc_host_probe(struct platform_device *pdev)
plda = &port->plda;
plda->dev = dev;
- port->axi_base_addr = devm_platform_ioremap_resource(pdev, 1);
- if (IS_ERR(port->axi_base_addr))
- return PTR_ERR(port->axi_base_addr);
+ port->bridge_base_addr = devm_platform_ioremap_resource_byname(pdev,
+ "bridge");
+ port->ctrl_base_addr = devm_platform_ioremap_resource_byname(pdev,
+ "ctrl");
+ if (!IS_ERR(port->bridge_base_addr) && !IS_ERR(port->ctrl_base_addr))
+ goto addrs_set;
+
+ /*
+ * The original, incorrect, binding that lumped the control and
+ * bridge addresses together still needs to be handled by the driver.
+ */
+ apb_base_addr = devm_platform_ioremap_resource_byname(pdev, "apb");
+ if (IS_ERR(apb_base_addr))
+ return dev_err_probe(dev, PTR_ERR(apb_base_addr),
+ "both legacy apb register and ctrl/bridge regions missing");
+
+ port->bridge_base_addr = apb_base_addr + MC_PCIE1_BRIDGE_ADDR;
+ port->ctrl_base_addr = apb_base_addr + MC_PCIE1_CTRL_ADDR;
+addrs_set:
mc_disable_interrupts(port);
- bridge_base_addr = port->axi_base_addr + MC_PCIE_BRIDGE_ADDR;
- plda->bridge_addr = bridge_base_addr;
+ plda->bridge_addr = port->bridge_base_addr;
plda->num_events = NUM_EVENTS;
/* Allow enabling MSI by disabling MSI-X */
- val = readl(bridge_base_addr + PCIE_PCI_IRQ_DW0);
+ val = readl(port->bridge_base_addr + PCIE_PCI_IRQ_DW0);
val &= ~MSIX_CAP_MASK;
- writel(val, bridge_base_addr + PCIE_PCI_IRQ_DW0);
+ writel(val, port->bridge_base_addr + PCIE_PCI_IRQ_DW0);
/* Pick num vectors from bitfile programmed onto FPGA fabric */
- val = readl(bridge_base_addr + PCIE_PCI_IRQ_DW0);
+ val = readl(port->bridge_base_addr + PCIE_PCI_IRQ_DW0);
val &= NUM_MSI_MSGS_MASK;
val >>= NUM_MSI_MSGS_SHIFT;
plda->msi.num_vectors = 1 << val;
/* Pick vector address from design */
- plda->msi.vector_phy = readl_relaxed(bridge_base_addr + IMSI_ADDR);
+ plda->msi.vector_phy = readl_relaxed(port->bridge_base_addr + IMSI_ADDR);
ret = mc_pcie_init_clks(dev);
if (ret) {
