1 files changed, 304 insertions, 0 deletions
diff --git a/drivers/usb/isp1760/isp1760-if.c b/drivers/usb/isp1760/isp1760-if.c
new file mode 100644
index 000000000..65ba5aca2
--- /dev/null
+++ b/drivers/usb/isp1760/isp1760-if.c
@@ -0,0 +1,304 @@
+// 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 int isp1760_plat_remove(struct platform_device *pdev)
+{
+	isp1760_unregister(&pdev->dev);
+
+	return 0;
+}
+
+#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	= 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);