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openwrt/target/linux/leon/patches/015-dma_ops.patch
Imre Kaloz 0f325459ea add preliminary LEON support 
SVN-Revision: 25139
2011-01-27 12:51:25 +00:00

297 lines
8.7 KiB
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From c6d8f92cfd7f4f19eb3b16545b3b68c561978fe8 Mon Sep 17 00:00:00 2001
From: Kristoffer Glembo <kristoffer@gaisler.com>
Date: Mon, 7 Jun 2010 14:00:30 +0200
Subject: [PATCH] sparc32: Added LEON dma_ops.
Added leon3_dma_ops and mmu_inval_dma_area.
---
arch/sparc/kernel/ioport.c | 139 +++++++++++++++++++++++++++++++------------
1 files changed, 100 insertions(+), 39 deletions(-)
--- a/arch/sparc/kernel/ioport.c
+++ b/arch/sparc/kernel/ioport.c
@@ -50,10 +50,15 @@
#include <asm/io-unit.h>
#include <asm/leon.h>
-#ifdef CONFIG_SPARC_LEON
-#define mmu_inval_dma_area(p, l) leon_flush_dcache_all()
-#else
+#ifndef CONFIG_SPARC_LEON
#define mmu_inval_dma_area(p, l) /* Anton pulled it out for 2.4.0-xx */
+#else
+static inline void mmu_inval_dma_area(unsigned long va, unsigned long len)
+{
+ if (!sparc_leon3_snooping_enabled()) {
+ leon_flush_dcache_all();
+ }
+}
#endif
static struct resource *_sparc_find_resource(struct resource *r,
@@ -254,7 +259,7 @@ static void *sbus_alloc_coherent(struct
dma_addr_t *dma_addrp, gfp_t gfp)
{
struct platform_device *op = to_platform_device(dev);
- unsigned long len_total = (len + PAGE_SIZE-1) & PAGE_MASK;
+ unsigned long len_total = PAGE_ALIGN(len);
unsigned long va;
struct resource *res;
int order;
@@ -287,15 +292,19 @@ static void *sbus_alloc_coherent(struct
* XXX That's where sdev would be used. Currently we load
* all iommu tables with the same translations.
*/
- if (mmu_map_dma_area(dev, dma_addrp, va, res->start, len_total) != 0)
- goto err_noiommu;
-
- res->name = op->dev.of_node->name;
+#ifdef CONFIG_SPARC_LEON
+ sparc_mapiorange(0, virt_to_phys(va), res->start, len_total);
+ *dma_addrp = virt_to_phys(va);
+#else
+ if (mmu_map_dma_area(dev, dma_addrp, va, res->start, len_total) != 0) {
+ release_resource(res);
+ goto err_nova;
+ }
+#endif
+ res->name = op->node->name;
return (void *)(unsigned long)res->start;
-err_noiommu:
- release_resource(res);
err_nova:
free_pages(va, order);
err_nomem:
@@ -321,7 +330,7 @@ static void sbus_free_coherent(struct de
return;
}
- n = (n + PAGE_SIZE-1) & PAGE_MASK;
+ n = PAGE_ALIGN(n);
if ((res->end-res->start)+1 != n) {
printk("sbus_free_consistent: region 0x%lx asked 0x%zx\n",
(long)((res->end-res->start)+1), n);
@@ -333,7 +342,12 @@ static void sbus_free_coherent(struct de
/* mmu_inval_dma_area(va, n); */ /* it's consistent, isn't it */
pgv = virt_to_page(p);
- mmu_unmap_dma_area(dev, ba, n);
+
+#ifdef CONFIG_SPARC_LEON
+ sparc_unmapiorange((unsigned long)p, n);
+#else
+ mmu_unmap_dma_area(dev, ba, n);
+#endif
__free_pages(pgv, get_order(n));
}
@@ -408,9 +422,6 @@ struct dma_map_ops sbus_dma_ops = {
.sync_sg_for_device = sbus_sync_sg_for_device,
};
-struct dma_map_ops *dma_ops = &sbus_dma_ops;
-EXPORT_SYMBOL(dma_ops);
-
static int __init sparc_register_ioport(void)
{
register_proc_sparc_ioport();
@@ -422,7 +433,7 @@ arch_initcall(sparc_register_ioport);
#endif /* CONFIG_SBUS */
-#ifdef CONFIG_PCI
+#if defined(CONFIG_PCI) || defined(CONFIG_SPARC_LEON)
/* Allocate and map kernel buffer using consistent mode DMA for a device.
* hwdev should be valid struct pci_dev pointer for PCI devices.
@@ -430,7 +441,7 @@ arch_initcall(sparc_register_ioport);
static void *pci32_alloc_coherent(struct device *dev, size_t len,
dma_addr_t *pba, gfp_t gfp)
{
- unsigned long len_total = (len + PAGE_SIZE-1) & PAGE_MASK;
+ unsigned long len_total = PAGE_ALIGN(len);
unsigned long va;
struct resource *res;
int order;
@@ -463,10 +474,6 @@ static void *pci32_alloc_coherent(struct
return NULL;
}
mmu_inval_dma_area(va, len_total);
-#if 0
-/* P3 */ printk("pci_alloc_consistent: kva %lx uncva %lx phys %lx size %lx\n",
- (long)va, (long)res->start, (long)virt_to_phys(va), len_total);
-#endif
sparc_mapiorange(0, virt_to_phys(va), res->start, len_total);
*pba = virt_to_phys(va); /* equals virt_to_bus (R.I.P.) for us. */
@@ -498,7 +505,7 @@ static void pci32_free_coherent(struct d
return;
}
- n = (n + PAGE_SIZE-1) & PAGE_MASK;
+ n = PAGE_ALIGN(n);
if ((res->end-res->start)+1 != n) {
printk("pci_free_consistent: region 0x%lx asked 0x%lx\n",
(long)((res->end-res->start)+1), (long)n);
@@ -515,6 +522,14 @@ static void pci32_free_coherent(struct d
free_pages(pgp, get_order(n));
}
+static void pci32_unmap_page(struct device *dev, dma_addr_t ba, size_t size,
+ enum dma_data_direction dir, struct dma_attrs *attrs)
+{
+ if (dir != PCI_DMA_TODEVICE) {
+ mmu_inval_dma_area((unsigned long)phys_to_virt(ba), PAGE_ALIGN(size));
+ }
+}
+
/*
* Same as pci_map_single, but with pages.
*/
@@ -551,8 +566,7 @@ static int pci32_map_sg(struct device *d
/* IIep is write-through, not flushing. */
for_each_sg(sgl, sg, nents, n) {
- BUG_ON(page_address(sg_page(sg)) == NULL);
- sg->dma_address = virt_to_phys(sg_virt(sg));
+ sg->dma_address = sg_phys(sg);
sg->dma_length = sg->length;
}
return nents;
@@ -571,10 +585,7 @@ static void pci32_unmap_sg(struct device
if (dir != PCI_DMA_TODEVICE) {
for_each_sg(sgl, sg, nents, n) {
- BUG_ON(page_address(sg_page(sg)) == NULL);
- mmu_inval_dma_area(
- (unsigned long) page_address(sg_page(sg)),
- (sg->length + PAGE_SIZE-1) & PAGE_MASK);
+ mmu_inval_dma_area((unsigned long)sg_virt(sg), PAGE_ALIGN(sg->length));
}
}
}
@@ -594,7 +605,7 @@ static void pci32_sync_single_for_cpu(st
{
if (dir != PCI_DMA_TODEVICE) {
mmu_inval_dma_area((unsigned long)phys_to_virt(ba),
- (size + PAGE_SIZE-1) & PAGE_MASK);
+ PAGE_ALIGN(size));
}
}
@@ -621,10 +632,7 @@ static void pci32_sync_sg_for_cpu(struct
if (dir != PCI_DMA_TODEVICE) {
for_each_sg(sgl, sg, nents, n) {
- BUG_ON(page_address(sg_page(sg)) == NULL);
- mmu_inval_dma_area(
- (unsigned long) page_address(sg_page(sg)),
- (sg->length + PAGE_SIZE-1) & PAGE_MASK);
+ mmu_inval_dma_area((unsigned long)sg_virt(sg), PAGE_ALIGN(sg->length));
}
}
}
@@ -637,18 +645,38 @@ static void pci32_sync_sg_for_device(str
if (dir != PCI_DMA_TODEVICE) {
for_each_sg(sgl, sg, nents, n) {
- BUG_ON(page_address(sg_page(sg)) == NULL);
- mmu_inval_dma_area(
- (unsigned long) page_address(sg_page(sg)),
- (sg->length + PAGE_SIZE-1) & PAGE_MASK);
+ mmu_inval_dma_area((unsigned long)sg_virt(sg), PAGE_ALIGN(sg->length));
}
}
}
+/* LEON3 unmapping functions
+ *
+ * We can only invalidate the whole cache so unmap_page and unmap_sg do the same thing
+ */
+static void leon3_unmap_page(struct device *dev, dma_addr_t ba, size_t size,
+ enum dma_data_direction dir, struct dma_attrs *attrs)
+{
+ if (dir != PCI_DMA_TODEVICE) {
+ mmu_inval_dma_area(0, 0);
+ }
+}
+
+static void leon3_unmap_sg(struct device *dev, struct scatterlist *sgl,
+ int nents, enum dma_data_direction dir,
+ struct dma_attrs *attrs)
+{
+
+ if (dir != PCI_DMA_TODEVICE) {
+ mmu_inval_dma_area(0, 0);
+ }
+}
+
struct dma_map_ops pci32_dma_ops = {
.alloc_coherent = pci32_alloc_coherent,
.free_coherent = pci32_free_coherent,
.map_page = pci32_map_page,
+ .unmap_page = pci32_unmap_page,
.map_sg = pci32_map_sg,
.unmap_sg = pci32_unmap_sg,
.sync_single_for_cpu = pci32_sync_single_for_cpu,
@@ -658,7 +686,30 @@ struct dma_map_ops pci32_dma_ops = {
};
EXPORT_SYMBOL(pci32_dma_ops);
-#endif /* CONFIG_PCI */
+struct dma_map_ops leon3_dma_ops = {
+ .alloc_coherent = sbus_alloc_coherent,
+ .free_coherent = sbus_free_coherent,
+ .map_page = pci32_map_page,
+ .unmap_page = leon3_unmap_page,
+ .map_sg = pci32_map_sg,
+ .unmap_sg = leon3_unmap_sg,
+ .sync_single_for_cpu = pci32_sync_single_for_cpu,
+ .sync_single_for_device = pci32_sync_single_for_device,
+ .sync_sg_for_cpu = pci32_sync_sg_for_cpu,
+ .sync_sg_for_device = pci32_sync_sg_for_device,
+};
+
+#endif /* CONFIG_PCI || CONFIG_SPARC_LEON */
+
+#ifdef CONFIG_SPARC_LEON
+struct dma_map_ops *dma_ops = &leon3_dma_ops;
+#else
+struct dma_map_ops *dma_ops = &sbus_dma_ops;
+#endif
+
+#ifdef CONFIG_SBUS
+EXPORT_SYMBOL(dma_ops);
+#endif
/*
* Return whether the given PCI device DMA address mask can be
@@ -676,6 +727,16 @@ int dma_supported(struct device *dev, u6
}
EXPORT_SYMBOL(dma_supported);
+int dma_set_mask(struct device *dev, u64 dma_mask)
+{
+#ifdef CONFIG_PCI
+ if (dev->bus == &pci_bus_type)
+ return pci_set_dma_mask(to_pci_dev(dev), dma_mask);
+#endif
+ return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL(dma_set_mask);
+
#ifdef CONFIG_PROC_FS
static int sparc_io_proc_show(struct seq_file *m, void *v)
@@ -717,7 +778,7 @@ static const struct file_operations spar
static struct resource *_sparc_find_resource(struct resource *root,
unsigned long hit)
{
- struct resource *tmp;
+ struct resource *tmp;
for (tmp = root->child; tmp != 0; tmp = tmp->sibling) {
if (tmp->start <= hit && tmp->end >= hit)
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