irqchip: Add IMX MU MSI controller driver

The MU block found in a number of Freescale/NXP SoCs supports generating
IRQs by writing data to a register.

This enables the MU block to be used as a MSI controller, by leveraging
the platform-MSI API.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
[maz: dropped pointless dma-iommu.h and of_pci.h includes]
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220922161246.20586-4-Frank.Li@nxp.com
This commit is contained in:
Frank Li 2022-09-22 11:12:43 -05:00 committed by Marc Zyngier
parent 334f7d42db
commit 70afdab904
3 changed files with 468 additions and 0 deletions

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@ -481,6 +481,20 @@ config IMX_INTMUX
help
Support for the i.MX INTMUX interrupt multiplexer.
config IMX_MU_MSI
tristate "i.MX MU used as MSI controller"
depends on OF && HAS_IOMEM
default m if ARCH_MXC
select IRQ_DOMAIN
select IRQ_DOMAIN_HIERARCHY
select GENERIC_MSI_IRQ_DOMAIN
help
Provide a driver for the MU block used as a CPU-to-CPU MSI
controller. This requires a specially crafted DT to make use
of this driver.
If unsure, say N
config LS1X_IRQ
bool "Loongson-1 Interrupt Controller"
depends on MACH_LOONGSON32

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@ -99,6 +99,7 @@ obj-$(CONFIG_RISCV_INTC) += irq-riscv-intc.o
obj-$(CONFIG_SIFIVE_PLIC) += irq-sifive-plic.o
obj-$(CONFIG_IMX_IRQSTEER) += irq-imx-irqsteer.o
obj-$(CONFIG_IMX_INTMUX) += irq-imx-intmux.o
obj-$(CONFIG_IMX_MU_MSI) += irq-imx-mu-msi.o
obj-$(CONFIG_MADERA_IRQ) += irq-madera.o
obj-$(CONFIG_LS1X_IRQ) += irq-ls1x.o
obj-$(CONFIG_TI_SCI_INTR_IRQCHIP) += irq-ti-sci-intr.o

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@ -0,0 +1,453 @@
// SPDX-License-Identifier: GPL-2.0-only
/*
* Freescale MU used as MSI controller
*
* Copyright (c) 2018 Pengutronix, Oleksij Rempel <o.rempel@pengutronix.de>
* Copyright 2022 NXP
* Frank Li <Frank.Li@nxp.com>
* Peng Fan <peng.fan@nxp.com>
*
* Based on drivers/mailbox/imx-mailbox.c
*/
#include <linux/clk.h>
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irqdomain.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/msi.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/pm_runtime.h>
#include <linux/pm_domain.h>
#include <linux/spinlock.h>
#define IMX_MU_CHANS 4
enum imx_mu_xcr {
IMX_MU_GIER,
IMX_MU_GCR,
IMX_MU_TCR,
IMX_MU_RCR,
IMX_MU_xCR_MAX,
};
enum imx_mu_xsr {
IMX_MU_SR,
IMX_MU_GSR,
IMX_MU_TSR,
IMX_MU_RSR,
IMX_MU_xSR_MAX
};
enum imx_mu_type {
IMX_MU_V2 = BIT(1),
};
/* Receive Interrupt Enable */
#define IMX_MU_xCR_RIEn(data, x) ((data->cfg->type) & IMX_MU_V2 ? BIT(x) : BIT(24 + (3 - (x))))
#define IMX_MU_xSR_RFn(data, x) ((data->cfg->type) & IMX_MU_V2 ? BIT(x) : BIT(24 + (3 - (x))))
struct imx_mu_dcfg {
enum imx_mu_type type;
u32 xTR; /* Transmit Register0 */
u32 xRR; /* Receive Register0 */
u32 xSR[IMX_MU_xSR_MAX]; /* Status Registers */
u32 xCR[IMX_MU_xCR_MAX]; /* Control Registers */
};
struct imx_mu_msi {
raw_spinlock_t lock;
struct irq_domain *msi_domain;
void __iomem *regs;
phys_addr_t msiir_addr;
const struct imx_mu_dcfg *cfg;
unsigned long used;
struct clk *clk;
};
static void imx_mu_write(struct imx_mu_msi *msi_data, u32 val, u32 offs)
{
iowrite32(val, msi_data->regs + offs);
}
static u32 imx_mu_read(struct imx_mu_msi *msi_data, u32 offs)
{
return ioread32(msi_data->regs + offs);
}
static u32 imx_mu_xcr_rmw(struct imx_mu_msi *msi_data, enum imx_mu_xcr type, u32 set, u32 clr)
{
unsigned long flags;
u32 val;
raw_spin_lock_irqsave(&msi_data->lock, flags);
val = imx_mu_read(msi_data, msi_data->cfg->xCR[type]);
val &= ~clr;
val |= set;
imx_mu_write(msi_data, val, msi_data->cfg->xCR[type]);
raw_spin_unlock_irqrestore(&msi_data->lock, flags);
return val;
}
static void imx_mu_msi_parent_mask_irq(struct irq_data *data)
{
struct imx_mu_msi *msi_data = irq_data_get_irq_chip_data(data);
imx_mu_xcr_rmw(msi_data, IMX_MU_RCR, 0, IMX_MU_xCR_RIEn(msi_data, data->hwirq));
}
static void imx_mu_msi_parent_unmask_irq(struct irq_data *data)
{
struct imx_mu_msi *msi_data = irq_data_get_irq_chip_data(data);
imx_mu_xcr_rmw(msi_data, IMX_MU_RCR, IMX_MU_xCR_RIEn(msi_data, data->hwirq), 0);
}
static void imx_mu_msi_parent_ack_irq(struct irq_data *data)
{
struct imx_mu_msi *msi_data = irq_data_get_irq_chip_data(data);
imx_mu_read(msi_data, msi_data->cfg->xRR + data->hwirq * 4);
}
static struct irq_chip imx_mu_msi_irq_chip = {
.name = "MU-MSI",
.irq_ack = irq_chip_ack_parent,
};
static struct msi_domain_ops imx_mu_msi_irq_ops = {
};
static struct msi_domain_info imx_mu_msi_domain_info = {
.flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS),
.ops = &imx_mu_msi_irq_ops,
.chip = &imx_mu_msi_irq_chip,
};
static void imx_mu_msi_parent_compose_msg(struct irq_data *data,
struct msi_msg *msg)
{
struct imx_mu_msi *msi_data = irq_data_get_irq_chip_data(data);
u64 addr = msi_data->msiir_addr + 4 * data->hwirq;
msg->address_hi = upper_32_bits(addr);
msg->address_lo = lower_32_bits(addr);
msg->data = data->hwirq;
}
static int imx_mu_msi_parent_set_affinity(struct irq_data *irq_data,
const struct cpumask *mask, bool force)
{
return -EINVAL;
}
static struct irq_chip imx_mu_msi_parent_chip = {
.name = "MU",
.irq_mask = imx_mu_msi_parent_mask_irq,
.irq_unmask = imx_mu_msi_parent_unmask_irq,
.irq_ack = imx_mu_msi_parent_ack_irq,
.irq_compose_msi_msg = imx_mu_msi_parent_compose_msg,
.irq_set_affinity = imx_mu_msi_parent_set_affinity,
};
static int imx_mu_msi_domain_irq_alloc(struct irq_domain *domain,
unsigned int virq,
unsigned int nr_irqs,
void *args)
{
struct imx_mu_msi *msi_data = domain->host_data;
unsigned long flags;
int pos, err = 0;
WARN_ON(nr_irqs != 1);
raw_spin_lock_irqsave(&msi_data->lock, flags);
pos = find_first_zero_bit(&msi_data->used, IMX_MU_CHANS);
if (pos < IMX_MU_CHANS)
__set_bit(pos, &msi_data->used);
else
err = -ENOSPC;
raw_spin_unlock_irqrestore(&msi_data->lock, flags);
if (err)
return err;
irq_domain_set_info(domain, virq, pos,
&imx_mu_msi_parent_chip, msi_data,
handle_edge_irq, NULL, NULL);
return 0;
}
static void imx_mu_msi_domain_irq_free(struct irq_domain *domain,
unsigned int virq, unsigned int nr_irqs)
{
struct irq_data *d = irq_domain_get_irq_data(domain, virq);
struct imx_mu_msi *msi_data = irq_data_get_irq_chip_data(d);
unsigned long flags;
raw_spin_lock_irqsave(&msi_data->lock, flags);
__clear_bit(d->hwirq, &msi_data->used);
raw_spin_unlock_irqrestore(&msi_data->lock, flags);
}
static const struct irq_domain_ops imx_mu_msi_domain_ops = {
.alloc = imx_mu_msi_domain_irq_alloc,
.free = imx_mu_msi_domain_irq_free,
};
static void imx_mu_msi_irq_handler(struct irq_desc *desc)
{
struct imx_mu_msi *msi_data = irq_desc_get_handler_data(desc);
struct irq_chip *chip = irq_desc_get_chip(desc);
u32 status;
int i;
status = imx_mu_read(msi_data, msi_data->cfg->xSR[IMX_MU_RSR]);
chained_irq_enter(chip, desc);
for (i = 0; i < IMX_MU_CHANS; i++) {
if (status & IMX_MU_xSR_RFn(msi_data, i))
generic_handle_domain_irq(msi_data->msi_domain, i);
}
chained_irq_exit(chip, desc);
}
static int imx_mu_msi_domains_init(struct imx_mu_msi *msi_data, struct device *dev)
{
struct fwnode_handle *fwnodes = dev_fwnode(dev);
struct irq_domain *parent;
/* Initialize MSI domain parent */
parent = irq_domain_create_linear(fwnodes,
IMX_MU_CHANS,
&imx_mu_msi_domain_ops,
msi_data);
if (!parent) {
dev_err(dev, "failed to create IRQ domain\n");
return -ENOMEM;
}
irq_domain_update_bus_token(parent, DOMAIN_BUS_NEXUS);
msi_data->msi_domain = platform_msi_create_irq_domain(fwnodes,
&imx_mu_msi_domain_info,
parent);
if (!msi_data->msi_domain) {
dev_err(dev, "failed to create MSI domain\n");
irq_domain_remove(parent);
return -ENOMEM;
}
irq_domain_set_pm_device(msi_data->msi_domain, dev);
return 0;
}
/* Register offset of different version MU IP */
static const struct imx_mu_dcfg imx_mu_cfg_imx6sx = {
.type = 0,
.xTR = 0x0,
.xRR = 0x10,
.xSR = {
[IMX_MU_SR] = 0x20,
[IMX_MU_GSR] = 0x20,
[IMX_MU_TSR] = 0x20,
[IMX_MU_RSR] = 0x20,
},
.xCR = {
[IMX_MU_GIER] = 0x24,
[IMX_MU_GCR] = 0x24,
[IMX_MU_TCR] = 0x24,
[IMX_MU_RCR] = 0x24,
},
};
static const struct imx_mu_dcfg imx_mu_cfg_imx7ulp = {
.type = 0,
.xTR = 0x20,
.xRR = 0x40,
.xSR = {
[IMX_MU_SR] = 0x60,
[IMX_MU_GSR] = 0x60,
[IMX_MU_TSR] = 0x60,
[IMX_MU_RSR] = 0x60,
},
.xCR = {
[IMX_MU_GIER] = 0x64,
[IMX_MU_GCR] = 0x64,
[IMX_MU_TCR] = 0x64,
[IMX_MU_RCR] = 0x64,
},
};
static const struct imx_mu_dcfg imx_mu_cfg_imx8ulp = {
.type = IMX_MU_V2,
.xTR = 0x200,
.xRR = 0x280,
.xSR = {
[IMX_MU_SR] = 0xC,
[IMX_MU_GSR] = 0x118,
[IMX_MU_GSR] = 0x124,
[IMX_MU_RSR] = 0x12C,
},
.xCR = {
[IMX_MU_GIER] = 0x110,
[IMX_MU_GCR] = 0x114,
[IMX_MU_TCR] = 0x120,
[IMX_MU_RCR] = 0x128
},
};
static int __init imx_mu_of_init(struct device_node *dn,
struct device_node *parent,
const struct imx_mu_dcfg *cfg)
{
struct platform_device *pdev = of_find_device_by_node(dn);
struct device_link *pd_link_a;
struct device_link *pd_link_b;
struct imx_mu_msi *msi_data;
struct resource *res;
struct device *pd_a;
struct device *pd_b;
struct device *dev;
int ret;
int irq;
dev = &pdev->dev;
msi_data = devm_kzalloc(&pdev->dev, sizeof(*msi_data), GFP_KERNEL);
if (!msi_data)
return -ENOMEM;
msi_data->cfg = cfg;
msi_data->regs = devm_platform_ioremap_resource_byname(pdev, "processor-a-side");
if (IS_ERR(msi_data->regs)) {
dev_err(&pdev->dev, "failed to initialize 'regs'\n");
return PTR_ERR(msi_data->regs);
}
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "processor-b-side");
if (!res)
return -EIO;
msi_data->msiir_addr = res->start + msi_data->cfg->xTR;
irq = platform_get_irq(pdev, 0);
if (irq <= 0)
return -ENODEV;
platform_set_drvdata(pdev, msi_data);
msi_data->clk = devm_clk_get(dev, NULL);
if (IS_ERR(msi_data->clk))
return PTR_ERR(msi_data->clk);
pd_a = dev_pm_domain_attach_by_name(dev, "processor-a-side");
if (IS_ERR(pd_a))
return PTR_ERR(pd_a);
pd_b = dev_pm_domain_attach_by_name(dev, "processor-b-side");
if (IS_ERR(pd_b))
return PTR_ERR(pd_b);
pd_link_a = device_link_add(dev, pd_a,
DL_FLAG_STATELESS |
DL_FLAG_PM_RUNTIME |
DL_FLAG_RPM_ACTIVE);
if (!pd_link_a) {
dev_err(dev, "Failed to add device_link to mu a.\n");
goto err_pd_a;
}
pd_link_b = device_link_add(dev, pd_b,
DL_FLAG_STATELESS |
DL_FLAG_PM_RUNTIME |
DL_FLAG_RPM_ACTIVE);
if (!pd_link_b) {
dev_err(dev, "Failed to add device_link to mu a.\n");
goto err_pd_b;
}
ret = imx_mu_msi_domains_init(msi_data, dev);
if (ret)
goto err_dm_init;
pm_runtime_enable(dev);
irq_set_chained_handler_and_data(irq,
imx_mu_msi_irq_handler,
msi_data);
return 0;
err_dm_init:
device_link_remove(dev, pd_b);
err_pd_b:
device_link_remove(dev, pd_a);
err_pd_a:
return -EINVAL;
}
static int __maybe_unused imx_mu_runtime_suspend(struct device *dev)
{
struct imx_mu_msi *priv = dev_get_drvdata(dev);
clk_disable_unprepare(priv->clk);
return 0;
}
static int __maybe_unused imx_mu_runtime_resume(struct device *dev)
{
struct imx_mu_msi *priv = dev_get_drvdata(dev);
int ret;
ret = clk_prepare_enable(priv->clk);
if (ret)
dev_err(dev, "failed to enable clock\n");
return ret;
}
static const struct dev_pm_ops imx_mu_pm_ops = {
SET_RUNTIME_PM_OPS(imx_mu_runtime_suspend,
imx_mu_runtime_resume, NULL)
};
static int __init imx_mu_imx7ulp_of_init(struct device_node *dn,
struct device_node *parent)
{
return imx_mu_of_init(dn, parent, &imx_mu_cfg_imx7ulp);
}
static int __init imx_mu_imx6sx_of_init(struct device_node *dn,
struct device_node *parent)
{
return imx_mu_of_init(dn, parent, &imx_mu_cfg_imx6sx);
}
static int __init imx_mu_imx8ulp_of_init(struct device_node *dn,
struct device_node *parent)
{
return imx_mu_of_init(dn, parent, &imx_mu_cfg_imx8ulp);
}
IRQCHIP_PLATFORM_DRIVER_BEGIN(imx_mu_msi)
IRQCHIP_MATCH("fsl,imx7ulp-mu-msi", imx_mu_imx7ulp_of_init)
IRQCHIP_MATCH("fsl,imx6sx-mu-msi", imx_mu_imx6sx_of_init)
IRQCHIP_MATCH("fsl,imx8ulp-mu-msi", imx_mu_imx8ulp_of_init)
IRQCHIP_PLATFORM_DRIVER_END(imx_mu_msi, .pm = &imx_mu_pm_ops)
MODULE_AUTHOR("Frank Li <Frank.Li@nxp.com>");
MODULE_DESCRIPTION("Freescale MU MSI controller driver");
MODULE_LICENSE("GPL");