// SPDX-License-Identifier: GPL-2.0
/*
* Glue code for the ISP1760 driver and bus
* Currently there is support for
* - OpenFirmware
* - PCI
* - PDEV (generic platform device centralized driver model)
*
* (c) 2007 Sebastian Siewior <bigeasy@linutronix.de>
* Copyright 2021 Linaro, Rui Miguel Silva <rui.silva@linaro.org>
*
*/
#include <linux/usb.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/usb/hcd.h>
#include <linux/usb/otg.h>
#include "isp1760-core.h"
#include "isp1760-regs.h"
#ifdef CONFIG_USB_PCI
#include <linux/pci.h>
#endif
#ifdef CONFIG_USB_PCI
static int isp1761_pci_init(struct pci_dev *dev)
{
resource_size_t mem_start;
resource_size_t mem_length;
u8 __iomem *iobase;
u8 latency, limit;
int retry_count;
u32 reg_data;
/* Grab the PLX PCI shared memory of the ISP 1761 we need */
mem_start = pci_resource_start(dev, 3);
mem_length = pci_resource_len(dev, 3);
if (mem_length < 0xffff) {
printk(KERN_ERR "memory length for this resource is wrong\n");
return -ENOMEM;
}
if (!request_mem_region(mem_start, mem_length, "ISP-PCI")) {
printk(KERN_ERR "host controller already in use\n");
return -EBUSY;
}
/* map available memory */
iobase = ioremap(mem_start, mem_length);
if (!iobase) {
printk(KERN_ERR "Error ioremap failed\n");
release_mem_region(mem_start, mem_length);
return -ENOMEM;
}
/* bad pci latencies can contribute to overruns */
pci_read_config_byte(dev, PCI_LATENCY_TIMER, &latency);
if (latency) {
pci_read_config_byte(dev, PCI_MAX_LAT, &limit);
if (limit && limit < latency)
pci_write_config_byte(dev, PCI_LATENCY_TIMER, limit);
}
/* Try to check whether we can access Scratch Register of
* Host Controller or not. The initial PCI access is retried until
* local init for the PCI bridge is completed
*/
retry_count = 20;
reg_data = 0;
while ((reg_data != 0xFACE) && retry_count) {
/*by default host is in 16bit mode, so
* io operations at this stage must be 16 bit
* */
writel(0xface, iobase + ISP176x_HC_SCRATCH);
udelay(100);
reg_data = readl(iobase + ISP176x_HC_SCRATCH) & 0x0000ffff;
retry_count--;
}
iounmap(iobase);
release_mem_region(mem_start, mem_length);
/* Host Controller presence is detected by writing to scratch register
* and reading back and checking the contents are same or not
*/
if (reg_data != 0xFACE) {
dev_err(&dev->dev, "scratch register mismatch %x\n", reg_data);
return -ENOMEM;
}
/* Grab the PLX PCI mem maped port start address we need */
mem_start = pci_resource_start(dev, 0);
mem_length = pci_resource_len(dev, 0);
if (!request_mem_region(mem_start, mem_length, "ISP1761 IO MEM")) {
printk(KERN_ERR "request region #1\n");
return -EBUSY;
}
iobase = ioremap(mem_start, mem_length);
if (!iobase) {
printk(KERN_ERR "ioremap #1\n");
release_mem_region(mem_start, mem_length);
return -ENOMEM;
}
/* configure PLX PCI chip to pass interrupts */
#define PLX_INT_CSR_REG 0x68
reg_data = readl(iobase + PLX_INT_CSR_REG);
reg_data |= 0x900;
writel(reg_data, iobase + PLX_INT_CSR_REG);
/* done with PLX IO access */
iounmap(iobase);
release_mem_region(mem_start, mem_length);
return 0;
}
static int isp1761_pci_probe(struct pci_dev *dev,
const struct pci_device_id *id)
{
unsigned int devflags = 0;
int ret;
if (!dev->irq)
return -ENODEV;
if (pci_enable_device(dev) < 0)
return -ENODEV;
ret = isp1761_pci_init(dev);
if (ret < 0)
goto error;
pci_set_master(dev);
ret = isp1760_register(&dev->resource[3], dev->irq, 0, &dev->dev,
devflags);
if (ret < 0)
goto error;
return 0;
error:
pci_disable_device(dev);
return ret;
}
static void isp1761_pci_remove(struct pci_dev *dev)
{
isp1760_unregister(&dev->dev);
pci_disable_device(dev);
}
static void isp1761_pci_shutdown(struct pci_dev *dev)
{
printk(KERN_ERR "ips1761_pci_shutdown\n");
}
static const struct pci_device_id isp1760_plx[] = {
{
.class = PCI_CLASS_BRIDGE_OTHER << 8,
.class_mask = ~0,
.vendor = PCI_VENDOR_ID_PLX,
.device = 0x5406,
.subvendor = PCI_VENDOR_ID_PLX,
.subdevice = 0x9054,
},
{ }
};
MODULE_DEVICE_TABLE(pci, isp1760_plx);
static struct pci_driver isp1761_pci_driver = {
.name = "isp1760",
.id_table = isp1760_plx,
.probe = isp1761_pci_probe,
.remove = isp1761_pci_remove,
.shutdown = isp1761_pci_shutdown,
};
#endif
static int isp1760_plat_probe(struct platform_device *pdev)
{
unsigned long irqflags;
unsigned int devflags = 0;
struct resource *mem_res;
int irq;
int ret;
mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
irqflags = irq_get_trigger_type(irq);
if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) {
struct device_node *dp = pdev->dev.of_node;
u32 bus_width = 0;
if (of_device_is_compatible(dp, "nxp,usb-isp1761"))
devflags |= ISP1760_FLAG_ISP1761;
if (of_device_is_compatible(dp, "nxp,usb-isp1763"))
devflags |= ISP1760_FLAG_ISP1763;
/*
* Some systems wire up only 8 of 16 data lines or
* 16 of the 32 data lines
*/
of_property_read_u32(dp, "bus-width", &bus_width);
if (bus_width == 16)
devflags |= ISP1760_FLAG_BUS_WIDTH_16;
else if (bus_width == 8)
devflags |= ISP1760_FLAG_BUS_WIDTH_8;
if (usb_get_dr_mode(&pdev->dev) == USB_DR_MODE_PERIPHERAL)
devflags |= ISP1760_FLAG_PERIPHERAL_EN;
if (of_property_read_bool(dp, "analog-oc"))
devflags |= ISP1760_FLAG_ANALOG_OC;
if (of_property_read_bool(dp, "dack-polarity"))
devflags |= ISP1760_FLAG_DACK_POL_HIGH;
if (of_property_read_bool(dp, "dreq-polarity"))
devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
} else {
pr_err("isp1760: no platform data\n");
return -ENXIO;
}
ret = isp1760_register(mem_res, irq, irqflags, &pdev->dev, devflags);
if (ret < 0)
return ret;
pr_info("ISP1760 USB device initialised\n");
return 0;
}
static void isp1760_plat_remove(struct platform_device *pdev)
{
isp1760_unregister(&pdev->dev);
}
#ifdef CONFIG_OF
static const struct of_device_id isp1760_of_match[] = {
{ .compatible = "nxp,usb-isp1760", },
{ .compatible = "nxp,usb-isp1761", },
{ .compatible = "nxp,usb-isp1763", },
{ },
};
MODULE_DEVICE_TABLE(of, isp1760_of_match);
#endif
static struct platform_driver isp1760_plat_driver = {
.probe = isp1760_plat_probe,
.remove_new = isp1760_plat_remove,
.driver = {
.name = "isp1760",
.of_match_table = of_match_ptr(isp1760_of_match),
},
};
static int __init isp1760_init(void)
{
int ret, any_ret = -ENODEV;
isp1760_init_kmem_once();
ret = platform_driver_register(&isp1760_plat_driver);
if (!ret)
any_ret = 0;
#ifdef CONFIG_USB_PCI
ret = pci_register_driver(&isp1761_pci_driver);
if (!ret)
any_ret = 0;
#endif
if (any_ret)
isp1760_deinit_kmem_cache();
return any_ret;
}
module_init(isp1760_init);
static void __exit isp1760_exit(void)
{
platform_driver_unregister(&isp1760_plat_driver);
#ifdef CONFIG_USB_PCI
pci_unregister_driver(&isp1761_pci_driver);
#endif
isp1760_deinit_kmem_cache();
}
module_exit(isp1760_exit);
