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linux/drivers/pci/controller/plda/pcie-microchip-host.c
Minda Chen d76ef0531c PCI: plda: Pass pci_host_bridge to plda_pcie_setup_iomems() 
plda_pcie_setup_iomems() needs the bridge->windows list from struct
pci_host_bridge and is currently used only by pcie-microchip-host.c.  This
driver uses pci_host_common_probe(), which sets a pci_host_bridge as the
drvdata, so plda_pcie_setup_iomems() used platform_get_drvdata() to find
the pci_host_bridge.

But we also want to use plda_pcie_setup_iomems() in the new pcie-starfive.c
driver, which does not use pci_host_common_probe() and will have struct
starfive_jh7110_pcie as its drvdata, so pass the pci_host_bridge directly
to plda_pcie_setup_iomems() so it doesn't need platform_get_drvdata() to
find it.

Link: https://lore.kernel.org/linux-pci/20240328091835.14797-9-minda.chen@starfivetech.com
Signed-off-by: Minda Chen <minda.chen@starfivetech.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
[bhelgaas: commit log, reorder to where this is needed]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
2024-05-28 11:15:29 -05:00

730 lines
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// SPDX-License-Identifier: GPL-2.0
/*
* Microchip AXI PCIe Bridge host controller driver
*
* Copyright (c) 2018 - 2020 Microchip Corporation. All rights reserved.
*
* Author: Daire McNamara <daire.mcnamara@microchip.com>
*/
#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irqdomain.h>
#include <linux/module.h>
#include <linux/msi.h>
#include <linux/of_address.h>
#include <linux/of_pci.h>
#include <linux/pci-ecam.h>
#include <linux/platform_device.h>
#include "../../pci.h"
#include "pcie-plda.h"
/* PCIe Bridge Phy and Controller Phy offsets */
#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
#define SEC_ERROR_INT 0x28
#define SEC_ERROR_INT_TX_RAM_SEC_ERR_INT GENMASK(3, 0)
#define SEC_ERROR_INT_RX_RAM_SEC_ERR_INT GENMASK(7, 4)
#define SEC_ERROR_INT_PCIE2AXI_RAM_SEC_ERR_INT GENMASK(11, 8)
#define SEC_ERROR_INT_AXI2PCIE_RAM_SEC_ERR_INT GENMASK(15, 12)
#define SEC_ERROR_INT_ALL_RAM_SEC_ERR_INT GENMASK(15, 0)
#define NUM_SEC_ERROR_INTS (4)
#define SEC_ERROR_INT_MASK 0x2c
#define DED_ERROR_INT 0x30
#define DED_ERROR_INT_TX_RAM_DED_ERR_INT GENMASK(3, 0)
#define DED_ERROR_INT_RX_RAM_DED_ERR_INT GENMASK(7, 4)
#define DED_ERROR_INT_PCIE2AXI_RAM_DED_ERR_INT GENMASK(11, 8)
#define DED_ERROR_INT_AXI2PCIE_RAM_DED_ERR_INT GENMASK(15, 12)
#define DED_ERROR_INT_ALL_RAM_DED_ERR_INT GENMASK(15, 0)
#define NUM_DED_ERROR_INTS (4)
#define DED_ERROR_INT_MASK 0x34
#define ECC_CONTROL 0x38
#define ECC_CONTROL_TX_RAM_INJ_ERROR_0 BIT(0)
#define ECC_CONTROL_TX_RAM_INJ_ERROR_1 BIT(1)
#define ECC_CONTROL_TX_RAM_INJ_ERROR_2 BIT(2)
#define ECC_CONTROL_TX_RAM_INJ_ERROR_3 BIT(3)
#define ECC_CONTROL_RX_RAM_INJ_ERROR_0 BIT(4)
#define ECC_CONTROL_RX_RAM_INJ_ERROR_1 BIT(5)
#define ECC_CONTROL_RX_RAM_INJ_ERROR_2 BIT(6)
#define ECC_CONTROL_RX_RAM_INJ_ERROR_3 BIT(7)
#define ECC_CONTROL_PCIE2AXI_RAM_INJ_ERROR_0 BIT(8)
#define ECC_CONTROL_PCIE2AXI_RAM_INJ_ERROR_1 BIT(9)
#define ECC_CONTROL_PCIE2AXI_RAM_INJ_ERROR_2 BIT(10)
#define ECC_CONTROL_PCIE2AXI_RAM_INJ_ERROR_3 BIT(11)
#define ECC_CONTROL_AXI2PCIE_RAM_INJ_ERROR_0 BIT(12)
#define ECC_CONTROL_AXI2PCIE_RAM_INJ_ERROR_1 BIT(13)
#define ECC_CONTROL_AXI2PCIE_RAM_INJ_ERROR_2 BIT(14)
#define ECC_CONTROL_AXI2PCIE_RAM_INJ_ERROR_3 BIT(15)
#define ECC_CONTROL_TX_RAM_ECC_BYPASS BIT(24)
#define ECC_CONTROL_RX_RAM_ECC_BYPASS BIT(25)
#define ECC_CONTROL_PCIE2AXI_RAM_ECC_BYPASS BIT(26)
#define ECC_CONTROL_AXI2PCIE_RAM_ECC_BYPASS BIT(27)
#define PCIE_EVENT_INT 0x14c
#define PCIE_EVENT_INT_L2_EXIT_INT BIT(0)
#define PCIE_EVENT_INT_HOTRST_EXIT_INT BIT(1)
#define PCIE_EVENT_INT_DLUP_EXIT_INT BIT(2)
#define PCIE_EVENT_INT_MASK GENMASK(2, 0)
#define PCIE_EVENT_INT_L2_EXIT_INT_MASK BIT(16)
#define PCIE_EVENT_INT_HOTRST_EXIT_INT_MASK BIT(17)
#define PCIE_EVENT_INT_DLUP_EXIT_INT_MASK BIT(18)
#define PCIE_EVENT_INT_ENB_MASK GENMASK(18, 16)
#define PCIE_EVENT_INT_ENB_SHIFT 16
#define NUM_PCIE_EVENTS (3)
/* PCIe Config space MSI capability structure */
#define MC_MSI_CAP_CTRL_OFFSET 0xe0u
/* Events */
#define EVENT_PCIE_L2_EXIT 0
#define EVENT_PCIE_HOTRST_EXIT 1
#define EVENT_PCIE_DLUP_EXIT 2
#define EVENT_SEC_TX_RAM_SEC_ERR 3
#define EVENT_SEC_RX_RAM_SEC_ERR 4
#define EVENT_SEC_PCIE2AXI_RAM_SEC_ERR 5
#define EVENT_SEC_AXI2PCIE_RAM_SEC_ERR 6
#define EVENT_DED_TX_RAM_DED_ERR 7
#define EVENT_DED_RX_RAM_DED_ERR 8
#define EVENT_DED_PCIE2AXI_RAM_DED_ERR 9
#define EVENT_DED_AXI2PCIE_RAM_DED_ERR 10
#define EVENT_LOCAL_DMA_END_ENGINE_0 11
#define EVENT_LOCAL_DMA_END_ENGINE_1 12
#define EVENT_LOCAL_DMA_ERROR_ENGINE_0 13
#define EVENT_LOCAL_DMA_ERROR_ENGINE_1 14
#define NUM_MC_EVENTS 15
#define EVENT_LOCAL_A_ATR_EVT_POST_ERR (NUM_MC_EVENTS + PLDA_AXI_POST_ERR)
#define EVENT_LOCAL_A_ATR_EVT_FETCH_ERR (NUM_MC_EVENTS + PLDA_AXI_FETCH_ERR)
#define EVENT_LOCAL_A_ATR_EVT_DISCARD_ERR (NUM_MC_EVENTS + PLDA_AXI_DISCARD_ERR)
#define EVENT_LOCAL_A_ATR_EVT_DOORBELL (NUM_MC_EVENTS + PLDA_AXI_DOORBELL)
#define EVENT_LOCAL_P_ATR_EVT_POST_ERR (NUM_MC_EVENTS + PLDA_PCIE_POST_ERR)
#define EVENT_LOCAL_P_ATR_EVT_FETCH_ERR (NUM_MC_EVENTS + PLDA_PCIE_FETCH_ERR)
#define EVENT_LOCAL_P_ATR_EVT_DISCARD_ERR (NUM_MC_EVENTS + PLDA_PCIE_DISCARD_ERR)
#define EVENT_LOCAL_P_ATR_EVT_DOORBELL (NUM_MC_EVENTS + PLDA_PCIE_DOORBELL)
#define EVENT_LOCAL_PM_MSI_INT_INTX (NUM_MC_EVENTS + PLDA_INTX)
#define EVENT_LOCAL_PM_MSI_INT_MSI (NUM_MC_EVENTS + PLDA_MSI)
#define EVENT_LOCAL_PM_MSI_INT_AER_EVT (NUM_MC_EVENTS + PLDA_AER_EVENT)
#define EVENT_LOCAL_PM_MSI_INT_EVENTS (NUM_MC_EVENTS + PLDA_MISC_EVENTS)
#define EVENT_LOCAL_PM_MSI_INT_SYS_ERR (NUM_MC_EVENTS + PLDA_SYS_ERR)
#define NUM_EVENTS (NUM_MC_EVENTS + PLDA_INT_EVENT_NUM)
#define PCIE_EVENT_CAUSE(x, s) \
[EVENT_PCIE_ ## x] = { __stringify(x), s }
#define SEC_ERROR_CAUSE(x, s) \
[EVENT_SEC_ ## x] = { __stringify(x), s }
#define DED_ERROR_CAUSE(x, s) \
[EVENT_DED_ ## x] = { __stringify(x), s }
#define LOCAL_EVENT_CAUSE(x, s) \
[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, \
.mask = PCIE_EVENT_INT_ ## x ## _INT, \
.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, \
.mask_high = 1, \
.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, \
.mask = DED_ERROR_INT_ ## x ## _INT, \
.enb_mask = 0
#define LOCAL_EVENT(x) \
.base = MC_PCIE_BRIDGE_ADDR, \
.offset = ISTATUS_LOCAL, \
.mask_offset = IMASK_LOCAL, \
.mask_high = 0, \
.mask = x ## _MASK, \
.enb_mask = 0
#define PCIE_EVENT_TO_EVENT_MAP(x) \
{ PCIE_EVENT_INT_ ## x ## _INT, EVENT_PCIE_ ## x }
#define SEC_ERROR_TO_EVENT_MAP(x) \
{ SEC_ERROR_INT_ ## x ## _INT, EVENT_SEC_ ## x }
#define DED_ERROR_TO_EVENT_MAP(x) \
{ DED_ERROR_INT_ ## x ## _INT, EVENT_DED_ ## x }
#define LOCAL_STATUS_TO_EVENT_MAP(x) \
{ x ## _MASK, EVENT_LOCAL_ ## x }
struct event_map {
u32 reg_mask;
u32 event_bit;
};
struct mc_pcie {
struct plda_pcie_rp plda;
void __iomem *axi_base_addr;
};
struct cause {
const char *sym;
const char *str;
};
static const struct cause event_cause[NUM_EVENTS] = {
PCIE_EVENT_CAUSE(L2_EXIT, "L2 exit event"),
PCIE_EVENT_CAUSE(HOTRST_EXIT, "Hot reset exit event"),
PCIE_EVENT_CAUSE(DLUP_EXIT, "DLUP exit event"),
SEC_ERROR_CAUSE(TX_RAM_SEC_ERR, "sec error in tx buffer"),
SEC_ERROR_CAUSE(RX_RAM_SEC_ERR, "sec error in rx buffer"),
SEC_ERROR_CAUSE(PCIE2AXI_RAM_SEC_ERR, "sec error in pcie2axi buffer"),
SEC_ERROR_CAUSE(AXI2PCIE_RAM_SEC_ERR, "sec error in axi2pcie buffer"),
DED_ERROR_CAUSE(TX_RAM_DED_ERR, "ded error in tx buffer"),
DED_ERROR_CAUSE(RX_RAM_DED_ERR, "ded error in rx buffer"),
DED_ERROR_CAUSE(PCIE2AXI_RAM_DED_ERR, "ded error in pcie2axi buffer"),
DED_ERROR_CAUSE(AXI2PCIE_RAM_DED_ERR, "ded error in axi2pcie buffer"),
LOCAL_EVENT_CAUSE(DMA_ERROR_ENGINE_0, "dma engine 0 error"),
LOCAL_EVENT_CAUSE(DMA_ERROR_ENGINE_1, "dma engine 1 error"),
LOCAL_EVENT_CAUSE(A_ATR_EVT_POST_ERR, "axi write request error"),
LOCAL_EVENT_CAUSE(A_ATR_EVT_FETCH_ERR, "axi read request error"),
LOCAL_EVENT_CAUSE(A_ATR_EVT_DISCARD_ERR, "axi read timeout"),
LOCAL_EVENT_CAUSE(P_ATR_EVT_POST_ERR, "pcie write request error"),
LOCAL_EVENT_CAUSE(P_ATR_EVT_FETCH_ERR, "pcie read request error"),
LOCAL_EVENT_CAUSE(P_ATR_EVT_DISCARD_ERR, "pcie read timeout"),
LOCAL_EVENT_CAUSE(PM_MSI_INT_AER_EVT, "aer event"),
LOCAL_EVENT_CAUSE(PM_MSI_INT_EVENTS, "pm/ltr/hotplug event"),
LOCAL_EVENT_CAUSE(PM_MSI_INT_SYS_ERR, "system error"),
};
static struct event_map pcie_event_to_event[] = {
PCIE_EVENT_TO_EVENT_MAP(L2_EXIT),
PCIE_EVENT_TO_EVENT_MAP(HOTRST_EXIT),
PCIE_EVENT_TO_EVENT_MAP(DLUP_EXIT),
};
static struct event_map sec_error_to_event[] = {
SEC_ERROR_TO_EVENT_MAP(TX_RAM_SEC_ERR),
SEC_ERROR_TO_EVENT_MAP(RX_RAM_SEC_ERR),
SEC_ERROR_TO_EVENT_MAP(PCIE2AXI_RAM_SEC_ERR),
SEC_ERROR_TO_EVENT_MAP(AXI2PCIE_RAM_SEC_ERR),
};
static struct event_map ded_error_to_event[] = {
DED_ERROR_TO_EVENT_MAP(TX_RAM_DED_ERR),
DED_ERROR_TO_EVENT_MAP(RX_RAM_DED_ERR),
DED_ERROR_TO_EVENT_MAP(PCIE2AXI_RAM_DED_ERR),
DED_ERROR_TO_EVENT_MAP(AXI2PCIE_RAM_DED_ERR),
};
static struct event_map local_status_to_event[] = {
LOCAL_STATUS_TO_EVENT_MAP(DMA_END_ENGINE_0),
LOCAL_STATUS_TO_EVENT_MAP(DMA_END_ENGINE_1),
LOCAL_STATUS_TO_EVENT_MAP(DMA_ERROR_ENGINE_0),
LOCAL_STATUS_TO_EVENT_MAP(DMA_ERROR_ENGINE_1),
LOCAL_STATUS_TO_EVENT_MAP(A_ATR_EVT_POST_ERR),
LOCAL_STATUS_TO_EVENT_MAP(A_ATR_EVT_FETCH_ERR),
LOCAL_STATUS_TO_EVENT_MAP(A_ATR_EVT_DISCARD_ERR),
LOCAL_STATUS_TO_EVENT_MAP(A_ATR_EVT_DOORBELL),
LOCAL_STATUS_TO_EVENT_MAP(P_ATR_EVT_POST_ERR),
LOCAL_STATUS_TO_EVENT_MAP(P_ATR_EVT_FETCH_ERR),
LOCAL_STATUS_TO_EVENT_MAP(P_ATR_EVT_DISCARD_ERR),
LOCAL_STATUS_TO_EVENT_MAP(P_ATR_EVT_DOORBELL),
LOCAL_STATUS_TO_EVENT_MAP(PM_MSI_INT_INTX),
LOCAL_STATUS_TO_EVENT_MAP(PM_MSI_INT_MSI),
LOCAL_STATUS_TO_EVENT_MAP(PM_MSI_INT_AER_EVT),
LOCAL_STATUS_TO_EVENT_MAP(PM_MSI_INT_EVENTS),
LOCAL_STATUS_TO_EVENT_MAP(PM_MSI_INT_SYS_ERR),
};
static struct {
u32 base;
u32 offset;
u32 mask;
u32 shift;
u32 enb_mask;
u32 mask_high;
u32 mask_offset;
} event_descs[] = {
{ PCIE_EVENT(L2_EXIT) },
{ PCIE_EVENT(HOTRST_EXIT) },
{ PCIE_EVENT(DLUP_EXIT) },
{ SEC_EVENT(TX_RAM_SEC_ERR) },
{ SEC_EVENT(RX_RAM_SEC_ERR) },
{ SEC_EVENT(PCIE2AXI_RAM_SEC_ERR) },
{ SEC_EVENT(AXI2PCIE_RAM_SEC_ERR) },
{ DED_EVENT(TX_RAM_DED_ERR) },
{ DED_EVENT(RX_RAM_DED_ERR) },
{ DED_EVENT(PCIE2AXI_RAM_DED_ERR) },
{ DED_EVENT(AXI2PCIE_RAM_DED_ERR) },
{ LOCAL_EVENT(DMA_END_ENGINE_0) },
{ LOCAL_EVENT(DMA_END_ENGINE_1) },
{ LOCAL_EVENT(DMA_ERROR_ENGINE_0) },
{ LOCAL_EVENT(DMA_ERROR_ENGINE_1) },
{ LOCAL_EVENT(A_ATR_EVT_POST_ERR) },
{ LOCAL_EVENT(A_ATR_EVT_FETCH_ERR) },
{ LOCAL_EVENT(A_ATR_EVT_DISCARD_ERR) },
{ LOCAL_EVENT(A_ATR_EVT_DOORBELL) },
{ LOCAL_EVENT(P_ATR_EVT_POST_ERR) },
{ LOCAL_EVENT(P_ATR_EVT_FETCH_ERR) },
{ LOCAL_EVENT(P_ATR_EVT_DISCARD_ERR) },
{ LOCAL_EVENT(P_ATR_EVT_DOORBELL) },
{ LOCAL_EVENT(PM_MSI_INT_INTX) },
{ LOCAL_EVENT(PM_MSI_INT_MSI) },
{ LOCAL_EVENT(PM_MSI_INT_AER_EVT) },
{ LOCAL_EVENT(PM_MSI_INT_EVENTS) },
{ LOCAL_EVENT(PM_MSI_INT_SYS_ERR) },
};
static char poss_clks[][5] = { "fic0", "fic1", "fic2", "fic3" };
static struct mc_pcie *port;
static void mc_pcie_enable_msi(struct mc_pcie *port, void __iomem *ecam)
{
struct plda_msi *msi = &port->plda.msi;
u16 reg;
u8 queue_size;
/* Fixup MSI enable flag */
reg = readw_relaxed(ecam + MC_MSI_CAP_CTRL_OFFSET + PCI_MSI_FLAGS);
reg |= PCI_MSI_FLAGS_ENABLE;
writew_relaxed(reg, ecam + MC_MSI_CAP_CTRL_OFFSET + PCI_MSI_FLAGS);
/* Fixup PCI MSI queue flags */
queue_size = FIELD_GET(PCI_MSI_FLAGS_QMASK, reg);
reg |= FIELD_PREP(PCI_MSI_FLAGS_QSIZE, queue_size);
writew_relaxed(reg, ecam + MC_MSI_CAP_CTRL_OFFSET + PCI_MSI_FLAGS);
/* Fixup MSI addr fields */
writel_relaxed(lower_32_bits(msi->vector_phy),
ecam + MC_MSI_CAP_CTRL_OFFSET + PCI_MSI_ADDRESS_LO);
writel_relaxed(upper_32_bits(msi->vector_phy),
ecam + MC_MSI_CAP_CTRL_OFFSET + PCI_MSI_ADDRESS_HI);
}
static inline u32 reg_to_event(u32 reg, struct event_map field)
{
return (reg & field.reg_mask) ? BIT(field.event_bit) : 0;
}
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 val = 0;
int i;
for (i = 0; i < ARRAY_SIZE(pcie_event_to_event); i++)
val |= reg_to_event(reg, pcie_event_to_event[i]);
return val;
}
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 val = 0;
int i;
for (i = 0; i < ARRAY_SIZE(sec_error_to_event); i++)
val |= reg_to_event(reg, sec_error_to_event[i]);
return val;
}
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 val = 0;
int i;
for (i = 0; i < ARRAY_SIZE(ded_error_to_event); i++)
val |= reg_to_event(reg, ded_error_to_event[i]);
return val;
}
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 val = 0;
int i;
for (i = 0; i < ARRAY_SIZE(local_status_to_event); i++)
val |= reg_to_event(reg, local_status_to_event[i]);
return val;
}
static u32 mc_get_events(struct plda_pcie_rp *port)
{
struct mc_pcie *mc_port = container_of(port, struct mc_pcie, plda);
u32 events = 0;
events |= pcie_events(mc_port);
events |= sec_errors(mc_port);
events |= ded_errors(mc_port);
events |= local_events(mc_port);
return events;
}
static irqreturn_t mc_event_handler(int irq, void *dev_id)
{
struct plda_pcie_rp *port = dev_id;
struct device *dev = port->dev;
struct irq_data *data;
data = irq_domain_get_irq_data(port->event_domain, irq);
if (event_cause[data->hwirq].str)
dev_err_ratelimited(dev, "%s\n", event_cause[data->hwirq].str);
else
dev_err_ratelimited(dev, "bad event IRQ %ld\n", data->hwirq);
return IRQ_HANDLED;
}
static void mc_ack_event_irq(struct irq_data *data)
{
struct plda_pcie_rp *port = irq_data_get_irq_chip_data(data);
struct mc_pcie *mc_port = container_of(port, struct mc_pcie, plda);
u32 event = data->hwirq;
void __iomem *addr;
u32 mask;
addr = mc_port->axi_base_addr + event_descs[event].base +
event_descs[event].offset;
mask = event_descs[event].mask;
mask |= event_descs[event].enb_mask;
writel_relaxed(mask, addr);
}
static void mc_mask_event_irq(struct irq_data *data)
{
struct plda_pcie_rp *port = irq_data_get_irq_chip_data(data);
struct mc_pcie *mc_port = container_of(port, struct mc_pcie, plda);
u32 event = data->hwirq;
void __iomem *addr;
u32 mask;
u32 val;
addr = mc_port->axi_base_addr + event_descs[event].base +
event_descs[event].mask_offset;
mask = event_descs[event].mask;
if (event_descs[event].enb_mask) {
mask <<= PCIE_EVENT_INT_ENB_SHIFT;
mask &= PCIE_EVENT_INT_ENB_MASK;
}
if (!event_descs[event].mask_high)
mask = ~mask;
raw_spin_lock(&port->lock);
val = readl_relaxed(addr);
if (event_descs[event].mask_high)
val |= mask;
else
val &= mask;
writel_relaxed(val, addr);
raw_spin_unlock(&port->lock);
}
static void mc_unmask_event_irq(struct irq_data *data)
{
struct plda_pcie_rp *port = irq_data_get_irq_chip_data(data);
struct mc_pcie *mc_port = container_of(port, struct mc_pcie, plda);
u32 event = data->hwirq;
void __iomem *addr;
u32 mask;
u32 val;
addr = mc_port->axi_base_addr + event_descs[event].base +
event_descs[event].mask_offset;
mask = event_descs[event].mask;
if (event_descs[event].enb_mask)
mask <<= PCIE_EVENT_INT_ENB_SHIFT;
if (event_descs[event].mask_high)
mask = ~mask;
if (event_descs[event].enb_mask)
mask &= PCIE_EVENT_INT_ENB_MASK;
raw_spin_lock(&port->lock);
val = readl_relaxed(addr);
if (event_descs[event].mask_high)
val &= mask;
else
val |= mask;
writel_relaxed(val, addr);
raw_spin_unlock(&port->lock);
}
static struct irq_chip mc_event_irq_chip = {
.name = "Microchip PCIe EVENT",
.irq_ack = mc_ack_event_irq,
.irq_mask = mc_mask_event_irq,
.irq_unmask = mc_unmask_event_irq,
};
static inline void mc_pcie_deinit_clk(void *data)
{
struct clk *clk = data;
clk_disable_unprepare(clk);
}
static inline struct clk *mc_pcie_init_clk(struct device *dev, const char *id)
{
struct clk *clk;
int ret;
clk = devm_clk_get_optional(dev, id);
if (IS_ERR(clk))
return clk;
if (!clk)
return clk;
ret = clk_prepare_enable(clk);
if (ret)
return ERR_PTR(ret);
devm_add_action_or_reset(dev, mc_pcie_deinit_clk, clk);
return clk;
}
static int mc_pcie_init_clks(struct device *dev)
{
int i;
struct clk *fic;
/*
* PCIe may be clocked via Fabric Interface using between 1 and 4
* clocks. Scan DT for clocks and enable them if present
*/
for (i = 0; i < ARRAY_SIZE(poss_clks); i++) {
fic = mc_pcie_init_clk(dev, poss_clks[i]);
if (IS_ERR(fic))
return PTR_ERR(fic);
}
return 0;
}
static int mc_request_event_irq(struct plda_pcie_rp *plda, int event_irq,
int event)
{
return devm_request_irq(plda->dev, event_irq, mc_event_handler,
0, event_cause[event].sym, plda);
}
static const struct plda_event_ops mc_event_ops = {
.get_events = mc_get_events,
};
static const struct plda_event mc_event = {
.request_event_irq = mc_request_event_irq,
.intx_event = EVENT_LOCAL_PM_MSI_INT_INTX,
.msi_event = EVENT_LOCAL_PM_MSI_INT_MSI,
};
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);
}
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);
}
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 */
val = ECC_CONTROL_TX_RAM_ECC_BYPASS |
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);
/* Disable SEC errors and clear any outstanding */
writel_relaxed(SEC_ERROR_INT_ALL_RAM_SEC_ERR_INT, 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);
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);
/* Disable PCIe events and clear any outstanding */
val = PCIE_EVENT_INT_L2_EXIT_INT |
PCIE_EVENT_INT_HOTRST_EXIT_INT |
PCIE_EVENT_INT_DLUP_EXIT_INT |
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);
/* 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);
}
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,
cfg->res.start,
resource_size(&cfg->res));
/* Need some fixups in config space */
mc_pcie_enable_msi(port, cfg->win);
/* Configure non-config space outbound ranges */
ret = plda_pcie_setup_iomems(bridge, &port->plda);
if (ret)
return ret;
port->plda.event_ops = &mc_event_ops;
port->plda.event_irq_chip = &mc_event_irq_chip;
port->plda.events_bitmap = GENMASK(NUM_EVENTS - 1, 0);
/* Address translation is up; safe to enable interrupts */
ret = plda_init_interrupts(pdev, &port->plda, &mc_event);
if (ret)
return ret;
return 0;
}
static int mc_host_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
void __iomem *bridge_base_addr;
struct plda_pcie_rp *plda;
int ret;
u32 val;
port = devm_kzalloc(dev, sizeof(*port), GFP_KERNEL);
if (!port)
return -ENOMEM;
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);
mc_disable_interrupts(port);
bridge_base_addr = port->axi_base_addr + MC_PCIE_BRIDGE_ADDR;
plda->bridge_addr = 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 &= ~MSIX_CAP_MASK;
writel(val, 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 &= 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);
ret = mc_pcie_init_clks(dev);
if (ret) {
dev_err(dev, "failed to get clock resources, error %d\n", ret);
return -ENODEV;
}
return pci_host_common_probe(pdev);
}
static const struct pci_ecam_ops mc_ecam_ops = {
.init = mc_platform_init,
.pci_ops = {
.map_bus = pci_ecam_map_bus,
.read = pci_generic_config_read,
.write = pci_generic_config_write,
}
};
static const struct of_device_id mc_pcie_of_match[] = {
{
.compatible = "microchip,pcie-host-1.0",
.data = &mc_ecam_ops,
},
{},
};
MODULE_DEVICE_TABLE(of, mc_pcie_of_match);
static struct platform_driver mc_pcie_driver = {
.probe = mc_host_probe,
.driver = {
.name = "microchip-pcie",
.of_match_table = mc_pcie_of_match,
.suppress_bind_attrs = true,
},
};
builtin_platform_driver(mc_pcie_driver);
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Microchip PCIe host controller driver");
MODULE_AUTHOR("Daire McNamara <daire.mcnamara@microchip.com>");
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