Fixed MTP to work with TWRP

arch/ia64/hp/common/Makefile

@@ -0,0 +1,11 @@
+#
+# ia64/platform/hp/common/Makefile
+#
+# Copyright (C) 2002 Hewlett Packard
+# Copyright (C) Alex Williamson (alex_williamson@hp.com)
+#
+
+obj-y := sba_iommu.o
+obj-$(CONFIG_IA64_HP_ZX1_SWIOTLB) += hwsw_iommu.o
+obj-$(CONFIG_IA64_GENERIC) += hwsw_iommu.o
+obj-$(CONFIG_IA64_HP_AML_NFW) += aml_nfw.o

arch/ia64/hp/common/aml_nfw.c

@@ -0,0 +1,235 @@
+/*
+ * OpRegion handler to allow AML to call native firmware
+ *
+ * (c) Copyright 2007 Hewlett-Packard Development Company, L.P.
+ *	Bjorn Helgaas <bjorn.helgaas@hp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This driver implements HP Open Source Review Board proposal 1842,
+ * which was approved on 9/20/2006.
+ *
+ * For technical documentation, see the HP SPPA Firmware EAS, Appendix F.
+ *
+ * ACPI does not define a mechanism for AML methods to call native firmware
+ * interfaces such as PAL or SAL.  This OpRegion handler adds such a mechanism.
+ * After the handler is installed, an AML method can call native firmware by
+ * storing the arguments and firmware entry point to specific offsets in the
+ * OpRegion.  When AML reads the "return value" offset from the OpRegion, this
+ * handler loads up the arguments, makes the firmware call, and returns the
+ * result.
+ */
+
+#include <linux/module.h>
+#include <linux/acpi.h>
+#include <asm/sal.h>
+
+MODULE_AUTHOR("Bjorn Helgaas <bjorn.helgaas@hp.com>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("ACPI opregion handler for native firmware calls");
+
+static bool force_register;
+module_param_named(force, force_register, bool, 0);
+MODULE_PARM_DESC(force, "Install opregion handler even without HPQ5001 device");
+
+#define AML_NFW_SPACE		0xA1
+
+struct ia64_pdesc {
+	void *ip;
+	void *gp;
+};
+
+/*
+ * N.B.  The layout of this structure is defined in the HP SPPA FW EAS, and
+ *	 the member offsets are embedded in AML methods.
+ */
+struct ia64_nfw_context {
+	u64 arg[8];
+	struct ia64_sal_retval ret;
+	u64 ip;
+	u64 gp;
+	u64 pad[2];
+};
+
+static void *virt_map(u64 address)
+{
+	if (address & (1UL << 63))
+		return (void *) (__IA64_UNCACHED_OFFSET | address);
+
+	return __va(address);
+}
+
+static void aml_nfw_execute(struct ia64_nfw_context *c)
+{
+	struct ia64_pdesc virt_entry;
+	ia64_sal_handler entry;
+
+	virt_entry.ip = virt_map(c->ip);
+	virt_entry.gp = virt_map(c->gp);
+
+	entry = (ia64_sal_handler) &virt_entry;
+
+	IA64_FW_CALL(entry, c->ret,
+		     c->arg[0], c->arg[1], c->arg[2], c->arg[3],
+		     c->arg[4], c->arg[5], c->arg[6], c->arg[7]);
+}
+
+static void aml_nfw_read_arg(u8 *offset, u32 bit_width, u64 *value)
+{
+	switch (bit_width) {
+	case 8:
+		*value = *(u8 *)offset;
+		break;
+	case 16:
+		*value = *(u16 *)offset;
+		break;
+	case 32:
+		*value = *(u32 *)offset;
+		break;
+	case 64:
+		*value = *(u64 *)offset;
+		break;
+	}
+}
+
+static void aml_nfw_write_arg(u8 *offset, u32 bit_width, u64 *value)
+{
+	switch (bit_width) {
+	case 8:
+		*(u8 *) offset = *value;
+		break;
+	case 16:
+		*(u16 *) offset = *value;
+		break;
+	case 32:
+		*(u32 *) offset = *value;
+		break;
+	case 64:
+		*(u64 *) offset = *value;
+		break;
+	}
+}
+
+static acpi_status aml_nfw_handler(u32 function, acpi_physical_address address,
+	u32 bit_width, u64 *value, void *handler_context,
+	void *region_context)
+{
+	struct ia64_nfw_context *context = handler_context;
+	u8 *offset = (u8 *) context + address;
+
+	if (bit_width !=  8 && bit_width != 16 &&
+	    bit_width != 32 && bit_width != 64)
+		return AE_BAD_PARAMETER;
+
+	if (address + (bit_width >> 3) > sizeof(struct ia64_nfw_context))
+		return AE_BAD_PARAMETER;
+
+	switch (function) {
+	case ACPI_READ:
+		if (address == offsetof(struct ia64_nfw_context, ret))
+			aml_nfw_execute(context);
+		aml_nfw_read_arg(offset, bit_width, value);
+		break;
+	case ACPI_WRITE:
+		aml_nfw_write_arg(offset, bit_width, value);
+		break;
+	}
+
+	return AE_OK;
+}
+
+static struct ia64_nfw_context global_context;
+static int global_handler_registered;
+
+static int aml_nfw_add_global_handler(void)
+{
+	acpi_status status;
+
+	if (global_handler_registered)
+		return 0;
+
+	status = acpi_install_address_space_handler(ACPI_ROOT_OBJECT,
+		AML_NFW_SPACE, aml_nfw_handler, NULL, &global_context);
+	if (ACPI_FAILURE(status))
+		return -ENODEV;
+
+	global_handler_registered = 1;
+	printk(KERN_INFO "Global 0x%02X opregion handler registered\n",
+		AML_NFW_SPACE);
+	return 0;
+}
+
+static int aml_nfw_remove_global_handler(void)
+{
+	acpi_status status;
+
+	if (!global_handler_registered)
+		return 0;
+
+	status = acpi_remove_address_space_handler(ACPI_ROOT_OBJECT,
+		AML_NFW_SPACE, aml_nfw_handler);
+	if (ACPI_FAILURE(status))
+		return -ENODEV;
+
+	global_handler_registered = 0;
+	printk(KERN_INFO "Global 0x%02X opregion handler removed\n",
+		AML_NFW_SPACE);
+	return 0;
+}
+
+static int aml_nfw_add(struct acpi_device *device)
+{
+	/*
+	 * We would normally allocate a new context structure and install
+	 * the address space handler for the specific device we found.
+	 * But the HP-UX implementation shares a single global context
+	 * and always puts the handler at the root, so we'll do the same.
+	 */
+	return aml_nfw_add_global_handler();
+}
+
+static int aml_nfw_remove(struct acpi_device *device)
+{
+	return aml_nfw_remove_global_handler();
+}
+
+static const struct acpi_device_id aml_nfw_ids[] = {
+	{"HPQ5001", 0},
+	{"", 0}
+};
+
+static struct acpi_driver acpi_aml_nfw_driver = {
+	.name = "native firmware",
+	.ids = aml_nfw_ids,
+	.ops = {
+		.add = aml_nfw_add,
+		.remove = aml_nfw_remove,
+		},
+};
+
+static int __init aml_nfw_init(void)
+{
+	int result;
+
+	if (force_register)
+		aml_nfw_add_global_handler();
+
+	result = acpi_bus_register_driver(&acpi_aml_nfw_driver);
+	if (result < 0) {
+		aml_nfw_remove_global_handler();
+		return result;
+	}
+
+	return 0;
+}
+
+static void __exit aml_nfw_exit(void)
+{
+	acpi_bus_unregister_driver(&acpi_aml_nfw_driver);
+	aml_nfw_remove_global_handler();
+}
+
+module_init(aml_nfw_init);
+module_exit(aml_nfw_exit);

arch/ia64/hp/common/hwsw_iommu.c

@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2004 Hewlett-Packard Development Company, L.P.
+ *   Contributed by David Mosberger-Tang <davidm@hpl.hp.com>
+ *
+ * This is a pseudo I/O MMU which dispatches to the hardware I/O MMU
+ * whenever possible.  We assume that the hardware I/O MMU requires
+ * full 32-bit addressability, as is the case, e.g., for HP zx1-based
+ * systems (there, the I/O MMU window is mapped at 3-4GB).  If a
+ * device doesn't provide full 32-bit addressability, we fall back on
+ * the sw I/O TLB.  This is good enough to let us support broken
+ * hardware such as soundcards which have a DMA engine that can
+ * address only 28 bits.
+ */
+
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/swiotlb.h>
+#include <linux/export.h>
+#include <asm/machvec.h>
+
+extern struct dma_map_ops sba_dma_ops, swiotlb_dma_ops;
+
+/* swiotlb declarations & definitions: */
+extern int swiotlb_late_init_with_default_size (size_t size);
+
+/*
+ * Note: we need to make the determination of whether or not to use
+ * the sw I/O TLB based purely on the device structure.  Anything else
+ * would be unreliable or would be too intrusive.
+ */
+static inline int use_swiotlb(struct device *dev)
+{
+	return dev && dev->dma_mask &&
+		!sba_dma_ops.dma_supported(dev, *dev->dma_mask);
+}
+
+struct dma_map_ops *hwsw_dma_get_ops(struct device *dev)
+{
+	if (use_swiotlb(dev))
+		return &swiotlb_dma_ops;
+	return &sba_dma_ops;
+}
+EXPORT_SYMBOL(hwsw_dma_get_ops);
+
+void __init
+hwsw_init (void)
+{
+	/* default to a smallish 2MB sw I/O TLB */
+	if (swiotlb_late_init_with_default_size (2 * (1<<20)) != 0) {
+#ifdef CONFIG_IA64_GENERIC
+		/* Better to have normal DMA than panic */
+		printk(KERN_WARNING "%s: Failed to initialize software I/O TLB,"
+		       " reverting to hpzx1 platform vector\n", __func__);
+		machvec_init("hpzx1");
+#else
+		panic("Unable to initialize software I/O TLB services");
+#endif
+	}
+}