Fixed MTP to work with TWRP

arch/x86/kernel/tce_64.c

@@ -0,0 +1,190 @@
+/*
+ * This file manages the translation entries for the IBM Calgary IOMMU.
+ *
+ * Derived from arch/powerpc/platforms/pseries/iommu.c
+ *
+ * Copyright (C) IBM Corporation, 2006
+ *
+ * Author: Jon Mason <jdmason@us.ibm.com>
+ * Author: Muli Ben-Yehuda <muli@il.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <linux/spinlock.h>
+#include <linux/string.h>
+#include <linux/pci.h>
+#include <linux/dma-mapping.h>
+#include <linux/bootmem.h>
+#include <asm/tce.h>
+#include <asm/calgary.h>
+#include <asm/proto.h>
+#include <asm/cacheflush.h>
+
+/* flush a tce at 'tceaddr' to main memory */
+static inline void flush_tce(void* tceaddr)
+{
+	/* a single tce can't cross a cache line */
+	if (cpu_has_clflush)
+		clflush(tceaddr);
+	else
+		wbinvd();
+}
+
+void tce_build(struct iommu_table *tbl, unsigned long index,
+	unsigned int npages, unsigned long uaddr, int direction)
+{
+	u64* tp;
+	u64 t;
+	u64 rpn;
+
+	t = (1 << TCE_READ_SHIFT);
+	if (direction != DMA_TO_DEVICE)
+		t |= (1 << TCE_WRITE_SHIFT);
+
+	tp = ((u64*)tbl->it_base) + index;
+
+	while (npages--) {
+		rpn = (virt_to_bus((void*)uaddr)) >> PAGE_SHIFT;
+		t &= ~TCE_RPN_MASK;
+		t |= (rpn << TCE_RPN_SHIFT);
+
+		*tp = cpu_to_be64(t);
+		flush_tce(tp);
+
+		uaddr += PAGE_SIZE;
+		tp++;
+	}
+}
+
+void tce_free(struct iommu_table *tbl, long index, unsigned int npages)
+{
+	u64* tp;
+
+	tp  = ((u64*)tbl->it_base) + index;
+
+	while (npages--) {
+		*tp = cpu_to_be64(0);
+		flush_tce(tp);
+		tp++;
+	}
+}
+
+static inline unsigned int table_size_to_number_of_entries(unsigned char size)
+{
+	/*
+	 * size is the order of the table, 0-7
+	 * smallest table is 8K entries, so shift result by 13 to
+	 * multiply by 8K
+	 */
+	return (1 << size) << 13;
+}
+
+static int tce_table_setparms(struct pci_dev *dev, struct iommu_table *tbl)
+{
+	unsigned int bitmapsz;
+	unsigned long bmppages;
+	int ret;
+
+	tbl->it_busno = dev->bus->number;
+
+	/* set the tce table size - measured in entries */
+	tbl->it_size = table_size_to_number_of_entries(specified_table_size);
+
+	/*
+	 * number of bytes needed for the bitmap size in number of
+	 * entries; we need one bit per entry
+	 */
+	bitmapsz = tbl->it_size / BITS_PER_BYTE;
+	bmppages = __get_free_pages(GFP_KERNEL, get_order(bitmapsz));
+	if (!bmppages) {
+		printk(KERN_ERR "Calgary: cannot allocate bitmap\n");
+		ret = -ENOMEM;
+		goto done;
+	}
+
+	tbl->it_map = (unsigned long*)bmppages;
+
+	memset(tbl->it_map, 0, bitmapsz);
+
+	tbl->it_hint = 0;
+
+	spin_lock_init(&tbl->it_lock);
+
+	return 0;
+
+done:
+	return ret;
+}
+
+int __init build_tce_table(struct pci_dev *dev, void __iomem *bbar)
+{
+	struct iommu_table *tbl;
+	int ret;
+
+	if (pci_iommu(dev->bus)) {
+		printk(KERN_ERR "Calgary: dev %p has sysdata->iommu %p\n",
+		       dev, pci_iommu(dev->bus));
+		BUG();
+	}
+
+	tbl = kzalloc(sizeof(struct iommu_table), GFP_KERNEL);
+	if (!tbl) {
+		printk(KERN_ERR "Calgary: error allocating iommu_table\n");
+		ret = -ENOMEM;
+		goto done;
+	}
+
+	ret = tce_table_setparms(dev, tbl);
+	if (ret)
+		goto free_tbl;
+
+	tbl->bbar = bbar;
+
+	set_pci_iommu(dev->bus, tbl);
+
+	return 0;
+
+free_tbl:
+	kfree(tbl);
+done:
+	return ret;
+}
+
+void * __init alloc_tce_table(void)
+{
+	unsigned int size;
+
+	size = table_size_to_number_of_entries(specified_table_size);
+	size *= TCE_ENTRY_SIZE;
+
+	return __alloc_bootmem_low(size, size, 0);
+}
+
+void __init free_tce_table(void *tbl)
+{
+	unsigned int size;
+
+	if (!tbl)
+		return;
+
+	size = table_size_to_number_of_entries(specified_table_size);
+	size *= TCE_ENTRY_SIZE;
+
+	free_bootmem(__pa(tbl), size);
+}