1 files changed, 309 insertions, 0 deletions
diff --git a/drivers/pci/hotplug/cpcihp_zt5550.c b/drivers/pci/hotplug/cpcihp_zt5550.c
new file mode 100644
index 000000000..ae63e5a39
--- /dev/null
+++ b/drivers/pci/hotplug/cpcihp_zt5550.c
@@ -0,0 +1,309 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * cpcihp_zt5550.c
+ *
+ * Intel/Ziatech ZT5550 CompactPCI Host Controller driver
+ *
+ * Copyright 2002 SOMA Networks, Inc.
+ * Copyright 2001 Intel San Luis Obispo
+ * Copyright 2000,2001 MontaVista Software Inc.
+ *
+ * Send feedback to <scottm@somanetworks.com>
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/signal.h>	/* IRQF_SHARED */
+#include "cpci_hotplug.h"
+#include "cpcihp_zt5550.h"
+
+#define DRIVER_VERSION	"0.2"
+#define DRIVER_AUTHOR	"Scott Murray <scottm@somanetworks.com>"
+#define DRIVER_DESC	"ZT5550 CompactPCI Hot Plug Driver"
+
+#define MY_NAME	"cpcihp_zt5550"
+
+#define dbg(format, arg...)					\
+	do {							\
+		if (debug)					\
+			printk(KERN_DEBUG "%s: " format "\n",	\
+				MY_NAME, ## arg);		\
+	} while (0)
+#define err(format, arg...) printk(KERN_ERR "%s: " format "\n", MY_NAME, ## arg)
+#define info(format, arg...) printk(KERN_INFO "%s: " format "\n", MY_NAME, ## arg)
+#define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n", MY_NAME, ## arg)
+
+/* local variables */
+static bool debug;
+static bool poll;
+static struct cpci_hp_controller_ops zt5550_hpc_ops;
+static struct cpci_hp_controller zt5550_hpc;
+
+/* Primary cPCI bus bridge device */
+static struct pci_dev *bus0_dev;
+static struct pci_bus *bus0;
+
+/* Host controller device */
+static struct pci_dev *hc_dev;
+
+/* Host controller register addresses */
+static void __iomem *hc_registers;
+static void __iomem *csr_hc_index;
+static void __iomem *csr_hc_data;
+static void __iomem *csr_int_status;
+static void __iomem *csr_int_mask;
+
+
+static int zt5550_hc_config(struct pci_dev *pdev)
+{
+	int ret;
+
+	/* Since we know that no boards exist with two HC chips, treat it as an error */
+	if (hc_dev) {
+		err("too many host controller devices?");
+		return -EBUSY;
+	}
+
+	ret = pci_enable_device(pdev);
+	if (ret) {
+		err("cannot enable %s\n", pci_name(pdev));
+		return ret;
+	}
+
+	hc_dev = pdev;
+	dbg("hc_dev = %p", hc_dev);
+	dbg("pci resource start %llx", (unsigned long long)pci_resource_start(hc_dev, 1));
+	dbg("pci resource len %llx", (unsigned long long)pci_resource_len(hc_dev, 1));
+
+	if (!request_mem_region(pci_resource_start(hc_dev, 1),
+				pci_resource_len(hc_dev, 1), MY_NAME)) {
+		err("cannot reserve MMIO region");
+		ret = -ENOMEM;
+		goto exit_disable_device;
+	}
+
+	hc_registers =
+	    ioremap(pci_resource_start(hc_dev, 1), pci_resource_len(hc_dev, 1));
+	if (!hc_registers) {
+		err("cannot remap MMIO region %llx @ %llx",
+			(unsigned long long)pci_resource_len(hc_dev, 1),
+			(unsigned long long)pci_resource_start(hc_dev, 1));
+		ret = -ENODEV;
+		goto exit_release_region;
+	}
+
+	csr_hc_index = hc_registers + CSR_HCINDEX;
+	csr_hc_data = hc_registers + CSR_HCDATA;
+	csr_int_status = hc_registers + CSR_INTSTAT;
+	csr_int_mask = hc_registers + CSR_INTMASK;
+
+	/*
+	 * Disable host control, fault and serial interrupts
+	 */
+	dbg("disabling host control, fault and serial interrupts");
+	writeb((u8) HC_INT_MASK_REG, csr_hc_index);
+	writeb((u8) ALL_INDEXED_INTS_MASK, csr_hc_data);
+	dbg("disabled host control, fault and serial interrupts");
+
+	/*
+	 * Disable timer0, timer1 and ENUM interrupts
+	 */
+	dbg("disabling timer0, timer1 and ENUM interrupts");
+	writeb((u8) ALL_DIRECT_INTS_MASK, csr_int_mask);
+	dbg("disabled timer0, timer1 and ENUM interrupts");
+	return 0;
+
+exit_release_region:
+	release_mem_region(pci_resource_start(hc_dev, 1),
+			   pci_resource_len(hc_dev, 1));
+exit_disable_device:
+	pci_disable_device(hc_dev);
+	return ret;
+}
+
+static int zt5550_hc_cleanup(void)
+{
+	if (!hc_dev)
+		return -ENODEV;
+
+	iounmap(hc_registers);
+	release_mem_region(pci_resource_start(hc_dev, 1),
+			   pci_resource_len(hc_dev, 1));
+	pci_disable_device(hc_dev);
+	return 0;
+}
+
+static int zt5550_hc_query_enum(void)
+{
+	u8 value;
+
+	value = inb_p(ENUM_PORT);
+	return ((value & ENUM_MASK) == ENUM_MASK);
+}
+
+static int zt5550_hc_check_irq(void *dev_id)
+{
+	int ret;
+	u8 reg;
+
+	ret = 0;
+	if (dev_id == zt5550_hpc.dev_id) {
+		reg = readb(csr_int_status);
+		if (reg)
+			ret = 1;
+	}
+	return ret;
+}
+
+static int zt5550_hc_enable_irq(void)
+{
+	u8 reg;
+
+	if (hc_dev == NULL)
+		return -ENODEV;
+
+	reg = readb(csr_int_mask);
+	reg = reg & ~ENUM_INT_MASK;
+	writeb(reg, csr_int_mask);
+	return 0;
+}
+
+static int zt5550_hc_disable_irq(void)
+{
+	u8 reg;
+
+	if (hc_dev == NULL)
+		return -ENODEV;
+
+	reg = readb(csr_int_mask);
+	reg = reg | ENUM_INT_MASK;
+	writeb(reg, csr_int_mask);
+	return 0;
+}
+
+static int zt5550_hc_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	int status;
+
+	status = zt5550_hc_config(pdev);
+	if (status != 0)
+		return status;
+
+	dbg("returned from zt5550_hc_config");
+
+	memset(&zt5550_hpc, 0, sizeof(struct cpci_hp_controller));
+	zt5550_hpc_ops.query_enum = zt5550_hc_query_enum;
+	zt5550_hpc.ops = &zt5550_hpc_ops;
+	if (!poll) {
+		zt5550_hpc.irq = hc_dev->irq;
+		zt5550_hpc.irq_flags = IRQF_SHARED;
+		zt5550_hpc.dev_id = hc_dev;
+
+		zt5550_hpc_ops.enable_irq = zt5550_hc_enable_irq;
+		zt5550_hpc_ops.disable_irq = zt5550_hc_disable_irq;
+		zt5550_hpc_ops.check_irq = zt5550_hc_check_irq;
+	} else {
+		info("using ENUM# polling mode");
+	}
+
+	status = cpci_hp_register_controller(&zt5550_hpc);
+	if (status != 0) {
+		err("could not register cPCI hotplug controller");
+		goto init_hc_error;
+	}
+	dbg("registered controller");
+
+	/* Look for first device matching cPCI bus's bridge vendor and device IDs */
+	bus0_dev = pci_get_device(PCI_VENDOR_ID_DEC,
+				  PCI_DEVICE_ID_DEC_21154, NULL);
+	if (!bus0_dev) {
+		status = -ENODEV;
+		goto init_register_error;
+	}
+	bus0 = bus0_dev->subordinate;
+	pci_dev_put(bus0_dev);
+
+	status = cpci_hp_register_bus(bus0, 0x0a, 0x0f);
+	if (status != 0) {
+		err("could not register cPCI hotplug bus");
+		goto init_register_error;
+	}
+	dbg("registered bus");
+
+	status = cpci_hp_start();
+	if (status != 0) {
+		err("could not started cPCI hotplug system");
+		cpci_hp_unregister_bus(bus0);
+		goto init_register_error;
+	}
+	dbg("started cpci hp system");
+
+	return 0;
+init_register_error:
+	cpci_hp_unregister_controller(&zt5550_hpc);
+init_hc_error:
+	err("status = %d", status);
+	zt5550_hc_cleanup();
+	return status;
+
+}
+
+static void zt5550_hc_remove_one(struct pci_dev *pdev)
+{
+	cpci_hp_stop();
+	cpci_hp_unregister_bus(bus0);
+	cpci_hp_unregister_controller(&zt5550_hpc);
+	zt5550_hc_cleanup();
+}
+
+
+static const struct pci_device_id zt5550_hc_pci_tbl[] = {
+	{ PCI_VENDOR_ID_ZIATECH, PCI_DEVICE_ID_ZIATECH_5550_HC, PCI_ANY_ID, PCI_ANY_ID, },
+	{ 0, }
+};
+MODULE_DEVICE_TABLE(pci, zt5550_hc_pci_tbl);
+
+static struct pci_driver zt5550_hc_driver = {
+	.name		= "zt5550_hc",
+	.id_table	= zt5550_hc_pci_tbl,
+	.probe		= zt5550_hc_init_one,
+	.remove		= zt5550_hc_remove_one,
+};
+
+static int __init zt5550_init(void)
+{
+	struct resource *r;
+	int rc;
+
+	info(DRIVER_DESC " version: " DRIVER_VERSION);
+	r = request_region(ENUM_PORT, 1, "#ENUM hotswap signal register");
+	if (!r)
+		return -EBUSY;
+
+	rc = pci_register_driver(&zt5550_hc_driver);
+	if (rc < 0)
+		release_region(ENUM_PORT, 1);
+	return rc;
+}
+
+static void __exit
+zt5550_exit(void)
+{
+	pci_unregister_driver(&zt5550_hc_driver);
+	release_region(ENUM_PORT, 1);
+}
+
+module_init(zt5550_init);
+module_exit(zt5550_exit);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
+module_param(debug, bool, 0644);
+MODULE_PARM_DESC(debug, "Debugging mode enabled or not");
+module_param(poll, bool, 0644);
+MODULE_PARM_DESC(poll, "#ENUM polling mode enabled or not");