linux/drivers/mfd/ioc3.c

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// SPDX-License-Identifier: GPL-2.0
/*
* SGI IOC3 multifunction device driver
*
* Copyright (C) 2018, 2019 Thomas Bogendoerfer <tbogendoerfer@suse.de>
*
* Based on work by:
* Stanislaw Skowronek <skylark@unaligned.org>
* Joshua Kinard <kumba@gentoo.org>
* Brent Casavant <bcasavan@sgi.com> - IOC4 master driver
* Pat Gefre <pfg@sgi.com> - IOC3 serial port IRQ demuxer
*/
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/platform_data/sgi-w1.h>
#include <linux/rtc/ds1685.h>
#include <asm/pci/bridge.h>
#include <asm/sn/ioc3.h>
#define IOC3_IRQ_SERIAL_A 6
#define IOC3_IRQ_SERIAL_B 15
#define IOC3_IRQ_KBD 22
/* Bitmask for selecting which IRQs are level triggered */
#define IOC3_LVL_MASK (BIT(IOC3_IRQ_SERIAL_A) | BIT(IOC3_IRQ_SERIAL_B))
#define M48T35_REG_SIZE 32768 /* size of m48t35 registers */
/* 1.2 us latency timer (40 cycles at 33 MHz) */
#define IOC3_LATENCY 40
struct ioc3_priv_data {
struct irq_domain *domain;
struct ioc3 __iomem *regs;
struct pci_dev *pdev;
int domain_irq;
};
static void ioc3_irq_ack(struct irq_data *d)
{
struct ioc3_priv_data *ipd = irq_data_get_irq_chip_data(d);
unsigned int hwirq = irqd_to_hwirq(d);
writel(BIT(hwirq), &ipd->regs->sio_ir);
}
static void ioc3_irq_mask(struct irq_data *d)
{
struct ioc3_priv_data *ipd = irq_data_get_irq_chip_data(d);
unsigned int hwirq = irqd_to_hwirq(d);
writel(BIT(hwirq), &ipd->regs->sio_iec);
}
static void ioc3_irq_unmask(struct irq_data *d)
{
struct ioc3_priv_data *ipd = irq_data_get_irq_chip_data(d);
unsigned int hwirq = irqd_to_hwirq(d);
writel(BIT(hwirq), &ipd->regs->sio_ies);
}
static struct irq_chip ioc3_irq_chip = {
.name = "IOC3",
.irq_ack = ioc3_irq_ack,
.irq_mask = ioc3_irq_mask,
.irq_unmask = ioc3_irq_unmask,
};
static int ioc3_irq_domain_map(struct irq_domain *d, unsigned int irq,
irq_hw_number_t hwirq)
{
/* Set level IRQs for every interrupt contained in IOC3_LVL_MASK */
if (BIT(hwirq) & IOC3_LVL_MASK)
irq_set_chip_and_handler(irq, &ioc3_irq_chip, handle_level_irq);
else
irq_set_chip_and_handler(irq, &ioc3_irq_chip, handle_edge_irq);
irq_set_chip_data(irq, d->host_data);
return 0;
}
static void ioc3_irq_domain_unmap(struct irq_domain *d, unsigned int irq)
{
irq_set_chip_and_handler(irq, NULL, NULL);
irq_set_chip_data(irq, NULL);
}
static const struct irq_domain_ops ioc3_irq_domain_ops = {
.map = ioc3_irq_domain_map,
.unmap = ioc3_irq_domain_unmap,
};
static void ioc3_irq_handler(struct irq_desc *desc)
{
struct irq_domain *domain = irq_desc_get_handler_data(desc);
struct ioc3_priv_data *ipd = domain->host_data;
struct ioc3 __iomem *regs = ipd->regs;
u32 pending, mask;
unsigned int irq;
pending = readl(&regs->sio_ir);
mask = readl(&regs->sio_ies);
pending &= mask; /* Mask off not enabled interrupts */
if (pending) {
irq = irq_find_mapping(domain, __ffs(pending));
if (irq)
generic_handle_irq(irq);
} else {
spurious_interrupt();
}
}
/*
* System boards/BaseIOs use more interrupt pins of the bridge ASIC
* to which the IOC3 is connected. Since the IOC3 MFD driver
* knows wiring of these extra pins, we use the map_irq function
* to get interrupts activated
*/
static int ioc3_map_irq(struct pci_dev *pdev, int slot, int pin)
{
struct pci_host_bridge *hbrg = pci_find_host_bridge(pdev->bus);
return hbrg->map_irq(pdev, slot, pin);
}
static int ioc3_irq_domain_setup(struct ioc3_priv_data *ipd, int irq)
{
struct irq_domain *domain;
struct fwnode_handle *fn;
fn = irq_domain_alloc_named_fwnode("IOC3");
if (!fn)
goto err;
domain = irq_domain_create_linear(fn, 24, &ioc3_irq_domain_ops, ipd);
if (!domain)
goto err;
irq_domain_free_fwnode(fn);
ipd->domain = domain;
irq_set_chained_handler_and_data(irq, ioc3_irq_handler, domain);
ipd->domain_irq = irq;
return 0;
err:
dev_err(&ipd->pdev->dev, "irq domain setup failed\n");
return -ENOMEM;
}
static struct resource ioc3_uarta_resources[] = {
DEFINE_RES_MEM(offsetof(struct ioc3, sregs.uarta),
sizeof_field(struct ioc3, sregs.uarta)),
DEFINE_RES_IRQ(IOC3_IRQ_SERIAL_A)
};
static struct resource ioc3_uartb_resources[] = {
DEFINE_RES_MEM(offsetof(struct ioc3, sregs.uartb),
sizeof_field(struct ioc3, sregs.uartb)),
DEFINE_RES_IRQ(IOC3_IRQ_SERIAL_B)
};
static struct mfd_cell ioc3_serial_cells[] = {
{
.name = "ioc3-serial8250",
.resources = ioc3_uarta_resources,
.num_resources = ARRAY_SIZE(ioc3_uarta_resources),
},
{
.name = "ioc3-serial8250",
.resources = ioc3_uartb_resources,
.num_resources = ARRAY_SIZE(ioc3_uartb_resources),
}
};
static int ioc3_serial_setup(struct ioc3_priv_data *ipd)
{
int ret;
/* Set gpio pins for RS232/RS422 mode selection */
writel(GPCR_UARTA_MODESEL | GPCR_UARTB_MODESEL,
&ipd->regs->gpcr_s);
/* Select RS232 mode for uart a */
writel(0, &ipd->regs->gppr[6]);
/* Select RS232 mode for uart b */
writel(0, &ipd->regs->gppr[7]);
/* Switch both ports to 16650 mode */
writel(readl(&ipd->regs->port_a.sscr) & ~SSCR_DMA_EN,
&ipd->regs->port_a.sscr);
writel(readl(&ipd->regs->port_b.sscr) & ~SSCR_DMA_EN,
&ipd->regs->port_b.sscr);
udelay(1000); /* Wait until mode switch is done */
ret = mfd_add_devices(&ipd->pdev->dev, PLATFORM_DEVID_AUTO,
ioc3_serial_cells, ARRAY_SIZE(ioc3_serial_cells),
&ipd->pdev->resource[0], 0, ipd->domain);
if (ret) {
dev_err(&ipd->pdev->dev, "Failed to add 16550 subdevs\n");
return ret;
}
return 0;
}
static struct resource ioc3_kbd_resources[] = {
DEFINE_RES_MEM(offsetof(struct ioc3, serio),
sizeof_field(struct ioc3, serio)),
DEFINE_RES_IRQ(IOC3_IRQ_KBD)
};
static struct mfd_cell ioc3_kbd_cells[] = {
{
.name = "ioc3-kbd",
.resources = ioc3_kbd_resources,
.num_resources = ARRAY_SIZE(ioc3_kbd_resources),
}
};
static int ioc3_kbd_setup(struct ioc3_priv_data *ipd)
{
int ret;
ret = mfd_add_devices(&ipd->pdev->dev, PLATFORM_DEVID_AUTO,
ioc3_kbd_cells, ARRAY_SIZE(ioc3_kbd_cells),
&ipd->pdev->resource[0], 0, ipd->domain);
if (ret) {
dev_err(&ipd->pdev->dev, "Failed to add 16550 subdevs\n");
return ret;
}
return 0;
}
static struct resource ioc3_eth_resources[] = {
DEFINE_RES_MEM(offsetof(struct ioc3, eth),
sizeof_field(struct ioc3, eth)),
DEFINE_RES_MEM(offsetof(struct ioc3, ssram),
sizeof_field(struct ioc3, ssram)),
DEFINE_RES_IRQ(0)
};
static struct resource ioc3_w1_resources[] = {
DEFINE_RES_MEM(offsetof(struct ioc3, mcr),
sizeof_field(struct ioc3, mcr)),
};
static struct sgi_w1_platform_data ioc3_w1_platform_data;
static struct mfd_cell ioc3_eth_cells[] = {
{
.name = "ioc3-eth",
.resources = ioc3_eth_resources,
.num_resources = ARRAY_SIZE(ioc3_eth_resources),
},
{
.name = "sgi_w1",
.resources = ioc3_w1_resources,
.num_resources = ARRAY_SIZE(ioc3_w1_resources),
.platform_data = &ioc3_w1_platform_data,
.pdata_size = sizeof(ioc3_w1_platform_data),
}
};
static int ioc3_eth_setup(struct ioc3_priv_data *ipd)
{
int ret;
/* Enable One-Wire bus */
writel(GPCR_MLAN_EN, &ipd->regs->gpcr_s);
/* Generate unique identifier */
snprintf(ioc3_w1_platform_data.dev_id,
sizeof(ioc3_w1_platform_data.dev_id), "ioc3-%012llx",
ipd->pdev->resource->start);
ret = mfd_add_devices(&ipd->pdev->dev, PLATFORM_DEVID_AUTO,
ioc3_eth_cells, ARRAY_SIZE(ioc3_eth_cells),
&ipd->pdev->resource[0], ipd->pdev->irq, NULL);
if (ret) {
dev_err(&ipd->pdev->dev, "Failed to add ETH/W1 subdev\n");
return ret;
}
return 0;
}
static struct resource ioc3_m48t35_resources[] = {
DEFINE_RES_MEM(IOC3_BYTEBUS_DEV0, M48T35_REG_SIZE)
};
static struct mfd_cell ioc3_m48t35_cells[] = {
{
.name = "rtc-m48t35",
.resources = ioc3_m48t35_resources,
.num_resources = ARRAY_SIZE(ioc3_m48t35_resources),
}
};
static int ioc3_m48t35_setup(struct ioc3_priv_data *ipd)
{
int ret;
ret = mfd_add_devices(&ipd->pdev->dev, PLATFORM_DEVID_AUTO,
ioc3_m48t35_cells, ARRAY_SIZE(ioc3_m48t35_cells),
&ipd->pdev->resource[0], 0, ipd->domain);
if (ret)
dev_err(&ipd->pdev->dev, "Failed to add M48T35 subdev\n");
return ret;
}
static struct ds1685_rtc_platform_data ip30_rtc_platform_data = {
.bcd_mode = false,
.no_irq = false,
.uie_unsupported = true,
.access_type = ds1685_reg_indirect,
};
static struct resource ioc3_rtc_ds1685_resources[] = {
DEFINE_RES_MEM(IOC3_BYTEBUS_DEV1, 1),
DEFINE_RES_MEM(IOC3_BYTEBUS_DEV2, 1),
DEFINE_RES_IRQ(0)
};
static struct mfd_cell ioc3_ds1685_cells[] = {
{
.name = "rtc-ds1685",
.resources = ioc3_rtc_ds1685_resources,
.num_resources = ARRAY_SIZE(ioc3_rtc_ds1685_resources),
.platform_data = &ip30_rtc_platform_data,
.pdata_size = sizeof(ip30_rtc_platform_data),
.id = PLATFORM_DEVID_NONE,
}
};
static int ioc3_ds1685_setup(struct ioc3_priv_data *ipd)
{
int ret, irq;
irq = ioc3_map_irq(ipd->pdev, 6, 0);
ret = mfd_add_devices(&ipd->pdev->dev, 0, ioc3_ds1685_cells,
ARRAY_SIZE(ioc3_ds1685_cells),
&ipd->pdev->resource[0], irq, NULL);
if (ret)
dev_err(&ipd->pdev->dev, "Failed to add DS1685 subdev\n");
return ret;
};
static struct resource ioc3_leds_resources[] = {
DEFINE_RES_MEM(offsetof(struct ioc3, gppr[0]),
sizeof_field(struct ioc3, gppr[0])),
DEFINE_RES_MEM(offsetof(struct ioc3, gppr[1]),
sizeof_field(struct ioc3, gppr[1])),
};
static struct mfd_cell ioc3_led_cells[] = {
{
.name = "ip30-leds",
.resources = ioc3_leds_resources,
.num_resources = ARRAY_SIZE(ioc3_leds_resources),
.id = PLATFORM_DEVID_NONE,
}
};
static int ioc3_led_setup(struct ioc3_priv_data *ipd)
{
int ret;
ret = mfd_add_devices(&ipd->pdev->dev, 0, ioc3_led_cells,
ARRAY_SIZE(ioc3_led_cells),
&ipd->pdev->resource[0], 0, ipd->domain);
if (ret)
dev_err(&ipd->pdev->dev, "Failed to add LED subdev\n");
return ret;
}
static int ip27_baseio_setup(struct ioc3_priv_data *ipd)
{
int ret, io_irq;
io_irq = ioc3_map_irq(ipd->pdev, PCI_SLOT(ipd->pdev->devfn),
PCI_INTERRUPT_INTB);
ret = ioc3_irq_domain_setup(ipd, io_irq);
if (ret)
return ret;
ret = ioc3_eth_setup(ipd);
if (ret)
return ret;
ret = ioc3_serial_setup(ipd);
if (ret)
return ret;
return ioc3_m48t35_setup(ipd);
}
static int ip27_baseio6g_setup(struct ioc3_priv_data *ipd)
{
int ret, io_irq;
io_irq = ioc3_map_irq(ipd->pdev, PCI_SLOT(ipd->pdev->devfn),
PCI_INTERRUPT_INTB);
ret = ioc3_irq_domain_setup(ipd, io_irq);
if (ret)
return ret;
ret = ioc3_eth_setup(ipd);
if (ret)
return ret;
ret = ioc3_serial_setup(ipd);
if (ret)
return ret;
ret = ioc3_m48t35_setup(ipd);
if (ret)
return ret;
return ioc3_kbd_setup(ipd);
}
static int ip27_mio_setup(struct ioc3_priv_data *ipd)
{
int ret;
ret = ioc3_irq_domain_setup(ipd, ipd->pdev->irq);
if (ret)
return ret;
ret = ioc3_serial_setup(ipd);
if (ret)
return ret;
return ioc3_kbd_setup(ipd);
}
static int ip30_sysboard_setup(struct ioc3_priv_data *ipd)
{
int ret, io_irq;
io_irq = ioc3_map_irq(ipd->pdev, PCI_SLOT(ipd->pdev->devfn),
PCI_INTERRUPT_INTB);
ret = ioc3_irq_domain_setup(ipd, io_irq);
if (ret)
return ret;
ret = ioc3_eth_setup(ipd);
if (ret)
return ret;
ret = ioc3_serial_setup(ipd);
if (ret)
return ret;
ret = ioc3_kbd_setup(ipd);
if (ret)
return ret;
ret = ioc3_ds1685_setup(ipd);
if (ret)
return ret;
return ioc3_led_setup(ipd);
}
static int ioc3_menet_setup(struct ioc3_priv_data *ipd)
{
int ret, io_irq;
io_irq = ioc3_map_irq(ipd->pdev, PCI_SLOT(ipd->pdev->devfn),
PCI_INTERRUPT_INTB);
ret = ioc3_irq_domain_setup(ipd, io_irq);
if (ret)
return ret;
ret = ioc3_eth_setup(ipd);
if (ret)
return ret;
return ioc3_serial_setup(ipd);
}
static int ioc3_menet4_setup(struct ioc3_priv_data *ipd)
{
return ioc3_eth_setup(ipd);
}
static int ioc3_cad_duo_setup(struct ioc3_priv_data *ipd)
{
int ret, io_irq;
io_irq = ioc3_map_irq(ipd->pdev, PCI_SLOT(ipd->pdev->devfn),
PCI_INTERRUPT_INTB);
ret = ioc3_irq_domain_setup(ipd, io_irq);
if (ret)
return ret;
ret = ioc3_eth_setup(ipd);
if (ret)
return ret;
return ioc3_kbd_setup(ipd);
}
/* Helper macro for filling ioc3_info array */
#define IOC3_SID(_name, _sid, _setup) \
{ \
.name = _name, \
.sid = PCI_VENDOR_ID_SGI | (IOC3_SUBSYS_ ## _sid << 16), \
.setup = _setup, \
}
static struct {
const char *name;
u32 sid;
int (*setup)(struct ioc3_priv_data *ipd);
} ioc3_infos[] = {
IOC3_SID("IP27 BaseIO6G", IP27_BASEIO6G, &ip27_baseio6g_setup),
IOC3_SID("IP27 MIO", IP27_MIO, &ip27_mio_setup),
IOC3_SID("IP27 BaseIO", IP27_BASEIO, &ip27_baseio_setup),
IOC3_SID("IP29 System Board", IP29_SYSBOARD, &ip27_baseio6g_setup),
IOC3_SID("IP30 System Board", IP30_SYSBOARD, &ip30_sysboard_setup),
IOC3_SID("MENET", MENET, &ioc3_menet_setup),
IOC3_SID("MENET4", MENET4, &ioc3_menet4_setup)
};
#undef IOC3_SID
static int ioc3_setup(struct ioc3_priv_data *ipd)
{
u32 sid;
int i;
/* Clear IRQs */
writel(~0, &ipd->regs->sio_iec);
writel(~0, &ipd->regs->sio_ir);
writel(0, &ipd->regs->eth.eier);
writel(~0, &ipd->regs->eth.eisr);
/* Read subsystem vendor id and subsystem id */
pci_read_config_dword(ipd->pdev, PCI_SUBSYSTEM_VENDOR_ID, &sid);
for (i = 0; i < ARRAY_SIZE(ioc3_infos); i++)
if (sid == ioc3_infos[i].sid) {
pr_info("ioc3: %s\n", ioc3_infos[i].name);
return ioc3_infos[i].setup(ipd);
}
/* Treat everything not identified by PCI subid as CAD DUO */
pr_info("ioc3: CAD DUO\n");
return ioc3_cad_duo_setup(ipd);
}
static int ioc3_mfd_probe(struct pci_dev *pdev,
const struct pci_device_id *pci_id)
{
struct ioc3_priv_data *ipd;
struct ioc3 __iomem *regs;
int ret;
ret = pci_enable_device(pdev);
if (ret)
return ret;
pci_write_config_byte(pdev, PCI_LATENCY_TIMER, IOC3_LATENCY);
pci_set_master(pdev);
ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
if (ret) {
pr_err("%s: No usable DMA configuration, aborting.\n",
pci_name(pdev));
goto out_disable_device;
}
/* Set up per-IOC3 data */
ipd = devm_kzalloc(&pdev->dev, sizeof(struct ioc3_priv_data),
GFP_KERNEL);
if (!ipd) {
ret = -ENOMEM;
goto out_disable_device;
}
ipd->pdev = pdev;
/*
* Map all IOC3 registers. These are shared between subdevices
* so the main IOC3 module manages them.
*/
regs = pci_ioremap_bar(pdev, 0);
if (!regs) {
dev_warn(&pdev->dev, "ioc3: Unable to remap PCI BAR for %s.\n",
pci_name(pdev));
ret = -ENOMEM;
goto out_disable_device;
}
ipd->regs = regs;
/* Track PCI-device specific data */
pci_set_drvdata(pdev, ipd);
ret = ioc3_setup(ipd);
if (ret) {
/* Remove all already added MFD devices */
mfd_remove_devices(&ipd->pdev->dev);
if (ipd->domain) {
irq_domain_remove(ipd->domain);
free_irq(ipd->domain_irq, (void *)ipd);
}
pci_iounmap(pdev, regs);
goto out_disable_device;
}
return 0;
out_disable_device:
pci_disable_device(pdev);
return ret;
}
static void ioc3_mfd_remove(struct pci_dev *pdev)
{
struct ioc3_priv_data *ipd;
ipd = pci_get_drvdata(pdev);
/* Clear and disable all IRQs */
writel(~0, &ipd->regs->sio_iec);
writel(~0, &ipd->regs->sio_ir);
/* Release resources */
mfd_remove_devices(&ipd->pdev->dev);
if (ipd->domain) {
irq_domain_remove(ipd->domain);
free_irq(ipd->domain_irq, (void *)ipd);
}
pci_iounmap(pdev, ipd->regs);
pci_disable_device(pdev);
}
static struct pci_device_id ioc3_mfd_id_table[] = {
{ PCI_VENDOR_ID_SGI, PCI_DEVICE_ID_SGI_IOC3, PCI_ANY_ID, PCI_ANY_ID },
{ 0, },
};
MODULE_DEVICE_TABLE(pci, ioc3_mfd_id_table);
static struct pci_driver ioc3_mfd_driver = {
.name = "IOC3",
.id_table = ioc3_mfd_id_table,
.probe = ioc3_mfd_probe,
.remove = ioc3_mfd_remove,
};
module_pci_driver(ioc3_mfd_driver);
MODULE_AUTHOR("Thomas Bogendoerfer <tbogendoerfer@suse.de>");
MODULE_DESCRIPTION("SGI IOC3 MFD driver");
MODULE_LICENSE("GPL v2");