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