1 files changed, 344 insertions, 0 deletions
diff --git a/arch/sparc/kernel/ioport.c b/arch/sparc/kernel/ioport.c
new file mode 100644
index 0000000000..5ebca5c7af
--- /dev/null
+++ b/arch/sparc/kernel/ioport.c
@@ -0,0 +1,344 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ioport.c:  Simple io mapping allocator.
+ *
+ * Copyright (C) 1995 David S. Miller (davem@caip.rutgers.edu)
+ * Copyright (C) 1995 Miguel de Icaza (miguel@nuclecu.unam.mx)
+ *
+ * 1996: sparc_free_io, 1999: ioremap()/iounmap() by Pete Zaitcev.
+ *
+ * 2000/01/29
+ * <rth> zait: as long as pci_alloc_consistent produces something addressable, 
+ *	things are ok.
+ * <zaitcev> rth: no, it is relevant, because get_free_pages returns you a
+ *	pointer into the big page mapping
+ * <rth> zait: so what?
+ * <rth> zait: remap_it_my_way(virt_to_phys(get_free_page()))
+ * <zaitcev> Hmm
+ * <zaitcev> Suppose I did this remap_it_my_way(virt_to_phys(get_free_page())).
+ *	So far so good.
+ * <zaitcev> Now, driver calls pci_free_consistent(with result of
+ *	remap_it_my_way()).
+ * <zaitcev> How do you find the address to pass to free_pages()?
+ * <rth> zait: walk the page tables?  It's only two or three level after all.
+ * <rth> zait: you have to walk them anyway to remove the mapping.
+ * <zaitcev> Hmm
+ * <zaitcev> Sounds reasonable
+ */
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/ioport.h>
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/pci.h>		/* struct pci_dev */
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/scatterlist.h>
+#include <linux/dma-map-ops.h>
+#include <linux/of.h>
+
+#include <asm/io.h>
+#include <asm/vaddrs.h>
+#include <asm/oplib.h>
+#include <asm/prom.h>
+#include <asm/page.h>
+#include <asm/pgalloc.h>
+#include <asm/dma.h>
+#include <asm/iommu.h>
+#include <asm/io-unit.h>
+#include <asm/leon.h>
+
+static void __iomem *_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz);
+static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
+    unsigned long size, char *name);
+static void _sparc_free_io(struct resource *res);
+
+static void register_proc_sparc_ioport(void);
+
+/* This points to the next to use virtual memory for DVMA mappings */
+static struct resource _sparc_dvma = {
+	.name = "sparc_dvma", .start = DVMA_VADDR, .end = DVMA_END - 1
+};
+/* This points to the start of I/O mappings, cluable from outside. */
+/*ext*/ struct resource sparc_iomap = {
+	.name = "sparc_iomap", .start = IOBASE_VADDR, .end = IOBASE_END - 1
+};
+
+/*
+ * Our mini-allocator...
+ * Boy this is gross! We need it because we must map I/O for
+ * timers and interrupt controller before the kmalloc is available.
+ */
+
+#define XNMLN  15
+#define XNRES  10	/* SS-10 uses 8 */
+
+struct xresource {
+	struct resource xres;	/* Must be first */
+	int xflag;		/* 1 == used */
+	char xname[XNMLN+1];
+};
+
+static struct xresource xresv[XNRES];
+
+static struct xresource *xres_alloc(void) {
+	struct xresource *xrp;
+	int n;
+
+	xrp = xresv;
+	for (n = 0; n < XNRES; n++) {
+		if (xrp->xflag == 0) {
+			xrp->xflag = 1;
+			return xrp;
+		}
+		xrp++;
+	}
+	return NULL;
+}
+
+static void xres_free(struct xresource *xrp) {
+	xrp->xflag = 0;
+}
+
+/*
+ * These are typically used in PCI drivers
+ * which are trying to be cross-platform.
+ *
+ * Bus type is always zero on IIep.
+ */
+void __iomem *ioremap(phys_addr_t offset, size_t size)
+{
+	char name[14];
+
+	sprintf(name, "phys_%08x", (u32)offset);
+	return _sparc_alloc_io(0, (unsigned long)offset, size, name);
+}
+EXPORT_SYMBOL(ioremap);
+
+/*
+ * Complementary to ioremap().
+ */
+void iounmap(volatile void __iomem *virtual)
+{
+	unsigned long vaddr = (unsigned long) virtual & PAGE_MASK;
+	struct resource *res;
+
+	/*
+	 * XXX Too slow. Can have 8192 DVMA pages on sun4m in the worst case.
+	 * This probably warrants some sort of hashing.
+	*/
+	if ((res = lookup_resource(&sparc_iomap, vaddr)) == NULL) {
+		printk("free_io/iounmap: cannot free %lx\n", vaddr);
+		return;
+	}
+	_sparc_free_io(res);
+
+	if ((char *)res >= (char*)xresv && (char *)res < (char *)&xresv[XNRES]) {
+		xres_free((struct xresource *)res);
+	} else {
+		kfree(res);
+	}
+}
+EXPORT_SYMBOL(iounmap);
+
+void __iomem *of_ioremap(struct resource *res, unsigned long offset,
+			 unsigned long size, char *name)
+{
+	return _sparc_alloc_io(res->flags & 0xF,
+			       res->start + offset,
+			       size, name);
+}
+EXPORT_SYMBOL(of_ioremap);
+
+void of_iounmap(struct resource *res, void __iomem *base, unsigned long size)
+{
+	iounmap(base);
+}
+EXPORT_SYMBOL(of_iounmap);
+
+/*
+ * Meat of mapping
+ */
+static void __iomem *_sparc_alloc_io(unsigned int busno, unsigned long phys,
+    unsigned long size, char *name)
+{
+	static int printed_full;
+	struct xresource *xres;
+	struct resource *res;
+	char *tack;
+	int tlen;
+	void __iomem *va;	/* P3 diag */
+
+	if (name == NULL) name = "???";
+
+	if ((xres = xres_alloc()) != NULL) {
+		tack = xres->xname;
+		res = &xres->xres;
+	} else {
+		if (!printed_full) {
+			printk("ioremap: done with statics, switching to malloc\n");
+			printed_full = 1;
+		}
+		tlen = strlen(name);
+		tack = kmalloc(sizeof (struct resource) + tlen + 1, GFP_KERNEL);
+		if (tack == NULL) return NULL;
+		memset(tack, 0, sizeof(struct resource));
+		res = (struct resource *) tack;
+		tack += sizeof (struct resource);
+	}
+
+	strscpy(tack, name, XNMLN+1);
+	res->name = tack;
+
+	va = _sparc_ioremap(res, busno, phys, size);
+	/* printk("ioremap(0x%x:%08lx[0x%lx])=%p\n", busno, phys, size, va); */ /* P3 diag */
+	return va;
+}
+
+/*
+ */
+static void __iomem *
+_sparc_ioremap(struct resource *res, u32 bus, u32 pa, int sz)
+{
+	unsigned long offset = ((unsigned long) pa) & (~PAGE_MASK);
+
+	if (allocate_resource(&sparc_iomap, res,
+	    (offset + sz + PAGE_SIZE-1) & PAGE_MASK,
+	    sparc_iomap.start, sparc_iomap.end, PAGE_SIZE, NULL, NULL) != 0) {
+		/* Usually we cannot see printks in this case. */
+		prom_printf("alloc_io_res(%s): cannot occupy\n",
+		    (res->name != NULL)? res->name: "???");
+		prom_halt();
+	}
+
+	pa &= PAGE_MASK;
+	srmmu_mapiorange(bus, pa, res->start, resource_size(res));
+
+	return (void __iomem *)(unsigned long)(res->start + offset);
+}
+
+/*
+ * Complementary to _sparc_ioremap().
+ */
+static void _sparc_free_io(struct resource *res)
+{
+	unsigned long plen;
+
+	plen = resource_size(res);
+	BUG_ON((plen & (PAGE_SIZE-1)) != 0);
+	srmmu_unmapiorange(res->start, plen);
+	release_resource(res);
+}
+
+unsigned long sparc_dma_alloc_resource(struct device *dev, size_t len)
+{
+	struct resource *res;
+
+	res = kzalloc(sizeof(*res), GFP_KERNEL);
+	if (!res)
+		return 0;
+	res->name = dev->of_node->full_name;
+
+	if (allocate_resource(&_sparc_dvma, res, len, _sparc_dvma.start,
+			      _sparc_dvma.end, PAGE_SIZE, NULL, NULL) != 0) {
+		printk("%s: cannot occupy 0x%zx", __func__, len);
+		kfree(res);
+		return 0;
+	}
+
+	return res->start;
+}
+
+bool sparc_dma_free_resource(void *cpu_addr, size_t size)
+{
+	unsigned long addr = (unsigned long)cpu_addr;
+	struct resource *res;
+
+	res = lookup_resource(&_sparc_dvma, addr);
+	if (!res) {
+		printk("%s: cannot free %p\n", __func__, cpu_addr);
+		return false;
+	}
+
+	if ((addr & (PAGE_SIZE - 1)) != 0) {
+		printk("%s: unaligned va %p\n", __func__, cpu_addr);
+		return false;
+	}
+
+	size = PAGE_ALIGN(size);
+	if (resource_size(res) != size) {
+		printk("%s: region 0x%lx asked 0x%zx\n",
+			__func__, (long)resource_size(res), size);
+		return false;
+	}
+
+	release_resource(res);
+	kfree(res);
+	return true;
+}
+
+#ifdef CONFIG_SBUS
+
+void sbus_set_sbus64(struct device *dev, int x)
+{
+	printk("sbus_set_sbus64: unsupported\n");
+}
+EXPORT_SYMBOL(sbus_set_sbus64);
+
+static int __init sparc_register_ioport(void)
+{
+	register_proc_sparc_ioport();
+
+	return 0;
+}
+
+arch_initcall(sparc_register_ioport);
+
+#endif /* CONFIG_SBUS */
+
+/*
+ * IIep is write-through, not flushing on cpu to device transfer.
+ *
+ * On LEON systems without cache snooping, the entire D-CACHE must be flushed to
+ * make DMA to cacheable memory coherent.
+ */
+void arch_sync_dma_for_cpu(phys_addr_t paddr, size_t size,
+		enum dma_data_direction dir)
+{
+	if (dir != DMA_TO_DEVICE &&
+	    sparc_cpu_model == sparc_leon &&
+	    !sparc_leon3_snooping_enabled())
+		leon_flush_dcache_all();
+}
+
+#ifdef CONFIG_PROC_FS
+
+static int sparc_io_proc_show(struct seq_file *m, void *v)
+{
+	struct resource *root = m->private, *r;
+	const char *nm;
+
+	for (r = root->child; r != NULL; r = r->sibling) {
+		if ((nm = r->name) == NULL) nm = "???";
+		seq_printf(m, "%016llx-%016llx: %s\n",
+				(unsigned long long)r->start,
+				(unsigned long long)r->end, nm);
+	}
+
+	return 0;
+}
+#endif /* CONFIG_PROC_FS */
+
+static void register_proc_sparc_ioport(void)
+{
+#ifdef CONFIG_PROC_FS
+	proc_create_single_data("io_map", 0, NULL, sparc_io_proc_show,
+			&sparc_iomap);
+	proc_create_single_data("dvma_map", 0, NULL, sparc_io_proc_show,
+			&_sparc_dvma);
+#endif
+}