summaryrefslogtreecommitdiffstats
path: root/arch/mips/jazz/jazzdma.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mips/jazz/jazzdma.c')
-rw-r--r--arch/mips/jazz/jazzdma.c623
1 files changed, 623 insertions, 0 deletions
diff --git a/arch/mips/jazz/jazzdma.c b/arch/mips/jazz/jazzdma.c
new file mode 100644
index 0000000000..eabddb89d2
--- /dev/null
+++ b/arch/mips/jazz/jazzdma.c
@@ -0,0 +1,623 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Mips Jazz DMA controller support
+ * Copyright (C) 1995, 1996 by Andreas Busse
+ *
+ * NOTE: Some of the argument checking could be removed when
+ * things have settled down. Also, instead of returning 0xffffffff
+ * on failure of vdma_alloc() one could leave page #0 unused
+ * and return the more usual NULL pointer as logical address.
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/export.h>
+#include <linux/errno.h>
+#include <linux/mm.h>
+#include <linux/memblock.h>
+#include <linux/spinlock.h>
+#include <linux/gfp.h>
+#include <linux/dma-map-ops.h>
+#include <asm/mipsregs.h>
+#include <asm/jazz.h>
+#include <asm/io.h>
+#include <linux/uaccess.h>
+#include <asm/dma.h>
+#include <asm/jazzdma.h>
+
+/*
+ * Set this to one to enable additional vdma debug code.
+ */
+#define CONF_DEBUG_VDMA 0
+
+static VDMA_PGTBL_ENTRY *pgtbl;
+
+static DEFINE_SPINLOCK(vdma_lock);
+
+/*
+ * Debug stuff
+ */
+#define vdma_debug ((CONF_DEBUG_VDMA) ? debuglvl : 0)
+
+static int debuglvl = 3;
+
+/*
+ * Initialize the pagetable with a one-to-one mapping of
+ * the first 16 Mbytes of main memory and declare all
+ * entries to be unused. Using this method will at least
+ * allow some early device driver operations to work.
+ */
+static inline void vdma_pgtbl_init(void)
+{
+ unsigned long paddr = 0;
+ int i;
+
+ for (i = 0; i < VDMA_PGTBL_ENTRIES; i++) {
+ pgtbl[i].frame = paddr;
+ pgtbl[i].owner = VDMA_PAGE_EMPTY;
+ paddr += VDMA_PAGESIZE;
+ }
+}
+
+/*
+ * Initialize the Jazz R4030 dma controller
+ */
+static int __init vdma_init(void)
+{
+ /*
+ * Allocate 32k of memory for DMA page tables. This needs to be page
+ * aligned and should be uncached to avoid cache flushing after every
+ * update.
+ */
+ pgtbl = (VDMA_PGTBL_ENTRY *)__get_free_pages(GFP_KERNEL | GFP_DMA,
+ get_order(VDMA_PGTBL_SIZE));
+ BUG_ON(!pgtbl);
+ dma_cache_wback_inv((unsigned long)pgtbl, VDMA_PGTBL_SIZE);
+ pgtbl = (VDMA_PGTBL_ENTRY *)CKSEG1ADDR((unsigned long)pgtbl);
+
+ /*
+ * Clear the R4030 translation table
+ */
+ vdma_pgtbl_init();
+
+ r4030_write_reg32(JAZZ_R4030_TRSTBL_BASE,
+ CPHYSADDR((unsigned long)pgtbl));
+ r4030_write_reg32(JAZZ_R4030_TRSTBL_LIM, VDMA_PGTBL_SIZE);
+ r4030_write_reg32(JAZZ_R4030_TRSTBL_INV, 0);
+
+ printk(KERN_INFO "VDMA: R4030 DMA pagetables initialized.\n");
+ return 0;
+}
+arch_initcall(vdma_init);
+
+/*
+ * Allocate DMA pagetables using a simple first-fit algorithm
+ */
+unsigned long vdma_alloc(unsigned long paddr, unsigned long size)
+{
+ int first, last, pages, frame, i;
+ unsigned long laddr, flags;
+
+ /* check arguments */
+
+ if (paddr > 0x1fffffff) {
+ if (vdma_debug)
+ printk("vdma_alloc: Invalid physical address: %08lx\n",
+ paddr);
+ return DMA_MAPPING_ERROR; /* invalid physical address */
+ }
+ if (size > 0x400000 || size == 0) {
+ if (vdma_debug)
+ printk("vdma_alloc: Invalid size: %08lx\n", size);
+ return DMA_MAPPING_ERROR; /* invalid physical address */
+ }
+
+ spin_lock_irqsave(&vdma_lock, flags);
+ /*
+ * Find free chunk
+ */
+ pages = VDMA_PAGE(paddr + size) - VDMA_PAGE(paddr) + 1;
+ first = 0;
+ while (1) {
+ while (pgtbl[first].owner != VDMA_PAGE_EMPTY &&
+ first < VDMA_PGTBL_ENTRIES) first++;
+ if (first + pages > VDMA_PGTBL_ENTRIES) { /* nothing free */
+ spin_unlock_irqrestore(&vdma_lock, flags);
+ return DMA_MAPPING_ERROR;
+ }
+
+ last = first + 1;
+ while (pgtbl[last].owner == VDMA_PAGE_EMPTY
+ && last - first < pages)
+ last++;
+
+ if (last - first == pages)
+ break; /* found */
+ first = last + 1;
+ }
+
+ /*
+ * Mark pages as allocated
+ */
+ laddr = (first << 12) + (paddr & (VDMA_PAGESIZE - 1));
+ frame = paddr & ~(VDMA_PAGESIZE - 1);
+
+ for (i = first; i < last; i++) {
+ pgtbl[i].frame = frame;
+ pgtbl[i].owner = laddr;
+ frame += VDMA_PAGESIZE;
+ }
+
+ /*
+ * Update translation table and return logical start address
+ */
+ r4030_write_reg32(JAZZ_R4030_TRSTBL_INV, 0);
+
+ if (vdma_debug > 1)
+ printk("vdma_alloc: Allocated %d pages starting from %08lx\n",
+ pages, laddr);
+
+ if (vdma_debug > 2) {
+ printk("LADDR: ");
+ for (i = first; i < last; i++)
+ printk("%08x ", i << 12);
+ printk("\nPADDR: ");
+ for (i = first; i < last; i++)
+ printk("%08x ", pgtbl[i].frame);
+ printk("\nOWNER: ");
+ for (i = first; i < last; i++)
+ printk("%08x ", pgtbl[i].owner);
+ printk("\n");
+ }
+
+ spin_unlock_irqrestore(&vdma_lock, flags);
+
+ return laddr;
+}
+
+EXPORT_SYMBOL(vdma_alloc);
+
+/*
+ * Free previously allocated dma translation pages
+ * Note that this does NOT change the translation table,
+ * it just marks the free'd pages as unused!
+ */
+int vdma_free(unsigned long laddr)
+{
+ int i;
+
+ i = laddr >> 12;
+
+ if (pgtbl[i].owner != laddr) {
+ printk
+ ("vdma_free: trying to free other's dma pages, laddr=%8lx\n",
+ laddr);
+ return -1;
+ }
+
+ while (i < VDMA_PGTBL_ENTRIES && pgtbl[i].owner == laddr) {
+ pgtbl[i].owner = VDMA_PAGE_EMPTY;
+ i++;
+ }
+
+ if (vdma_debug > 1)
+ printk("vdma_free: freed %ld pages starting from %08lx\n",
+ i - (laddr >> 12), laddr);
+
+ return 0;
+}
+
+EXPORT_SYMBOL(vdma_free);
+
+/*
+ * Translate a physical address to a logical address.
+ * This will return the logical address of the first
+ * match.
+ */
+unsigned long vdma_phys2log(unsigned long paddr)
+{
+ int i;
+ int frame;
+
+ frame = paddr & ~(VDMA_PAGESIZE - 1);
+
+ for (i = 0; i < VDMA_PGTBL_ENTRIES; i++) {
+ if (pgtbl[i].frame == frame)
+ break;
+ }
+
+ if (i == VDMA_PGTBL_ENTRIES)
+ return ~0UL;
+
+ return (i << 12) + (paddr & (VDMA_PAGESIZE - 1));
+}
+
+EXPORT_SYMBOL(vdma_phys2log);
+
+/*
+ * Translate a logical DMA address to a physical address
+ */
+unsigned long vdma_log2phys(unsigned long laddr)
+{
+ return pgtbl[laddr >> 12].frame + (laddr & (VDMA_PAGESIZE - 1));
+}
+
+EXPORT_SYMBOL(vdma_log2phys);
+
+/*
+ * Print DMA statistics
+ */
+void vdma_stats(void)
+{
+ int i;
+
+ printk("vdma_stats: CONFIG: %08x\n",
+ r4030_read_reg32(JAZZ_R4030_CONFIG));
+ printk("R4030 translation table base: %08x\n",
+ r4030_read_reg32(JAZZ_R4030_TRSTBL_BASE));
+ printk("R4030 translation table limit: %08x\n",
+ r4030_read_reg32(JAZZ_R4030_TRSTBL_LIM));
+ printk("vdma_stats: INV_ADDR: %08x\n",
+ r4030_read_reg32(JAZZ_R4030_INV_ADDR));
+ printk("vdma_stats: R_FAIL_ADDR: %08x\n",
+ r4030_read_reg32(JAZZ_R4030_R_FAIL_ADDR));
+ printk("vdma_stats: M_FAIL_ADDR: %08x\n",
+ r4030_read_reg32(JAZZ_R4030_M_FAIL_ADDR));
+ printk("vdma_stats: IRQ_SOURCE: %08x\n",
+ r4030_read_reg32(JAZZ_R4030_IRQ_SOURCE));
+ printk("vdma_stats: I386_ERROR: %08x\n",
+ r4030_read_reg32(JAZZ_R4030_I386_ERROR));
+ printk("vdma_chnl_modes: ");
+ for (i = 0; i < 8; i++)
+ printk("%04x ",
+ (unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_MODE +
+ (i << 5)));
+ printk("\n");
+ printk("vdma_chnl_enables: ");
+ for (i = 0; i < 8; i++)
+ printk("%04x ",
+ (unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
+ (i << 5)));
+ printk("\n");
+}
+
+/*
+ * DMA transfer functions
+ */
+
+/*
+ * Enable a DMA channel. Also clear any error conditions.
+ */
+void vdma_enable(int channel)
+{
+ int status;
+
+ if (vdma_debug)
+ printk("vdma_enable: channel %d\n", channel);
+
+ /*
+ * Check error conditions first
+ */
+ status = r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5));
+ if (status & 0x400)
+ printk("VDMA: Channel %d: Address error!\n", channel);
+ if (status & 0x200)
+ printk("VDMA: Channel %d: Memory error!\n", channel);
+
+ /*
+ * Clear all interrupt flags
+ */
+ r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
+ r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
+ (channel << 5)) | R4030_TC_INTR
+ | R4030_MEM_INTR | R4030_ADDR_INTR);
+
+ /*
+ * Enable the desired channel
+ */
+ r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
+ r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
+ (channel << 5)) |
+ R4030_CHNL_ENABLE);
+}
+
+EXPORT_SYMBOL(vdma_enable);
+
+/*
+ * Disable a DMA channel
+ */
+void vdma_disable(int channel)
+{
+ if (vdma_debug) {
+ int status =
+ r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
+ (channel << 5));
+
+ printk("vdma_disable: channel %d\n", channel);
+ printk("VDMA: channel %d status: %04x (%s) mode: "
+ "%02x addr: %06x count: %06x\n",
+ channel, status,
+ ((status & 0x600) ? "ERROR" : "OK"),
+ (unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_MODE +
+ (channel << 5)),
+ (unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_ADDR +
+ (channel << 5)),
+ (unsigned) r4030_read_reg32(JAZZ_R4030_CHNL_COUNT +
+ (channel << 5)));
+ }
+
+ r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
+ r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
+ (channel << 5)) &
+ ~R4030_CHNL_ENABLE);
+
+ /*
+ * After disabling a DMA channel a remote bus register should be
+ * read to ensure that the current DMA acknowledge cycle is completed.
+ */
+ *((volatile unsigned int *) JAZZ_DUMMY_DEVICE);
+}
+
+EXPORT_SYMBOL(vdma_disable);
+
+/*
+ * Set DMA mode. This function accepts the mode values used
+ * to set a PC-style DMA controller. For the SCSI and FDC
+ * channels, we also set the default modes each time we're
+ * called.
+ * NOTE: The FAST and BURST dma modes are supported by the
+ * R4030 Rev. 2 and PICA chipsets only. I leave them disabled
+ * for now.
+ */
+void vdma_set_mode(int channel, int mode)
+{
+ if (vdma_debug)
+ printk("vdma_set_mode: channel %d, mode 0x%x\n", channel,
+ mode);
+
+ switch (channel) {
+ case JAZZ_SCSI_DMA: /* scsi */
+ r4030_write_reg32(JAZZ_R4030_CHNL_MODE + (channel << 5),
+/* R4030_MODE_FAST | */
+/* R4030_MODE_BURST | */
+ R4030_MODE_INTR_EN |
+ R4030_MODE_WIDTH_16 |
+ R4030_MODE_ATIME_80);
+ break;
+
+ case JAZZ_FLOPPY_DMA: /* floppy */
+ r4030_write_reg32(JAZZ_R4030_CHNL_MODE + (channel << 5),
+/* R4030_MODE_FAST | */
+/* R4030_MODE_BURST | */
+ R4030_MODE_INTR_EN |
+ R4030_MODE_WIDTH_8 |
+ R4030_MODE_ATIME_120);
+ break;
+
+ case JAZZ_AUDIOL_DMA:
+ case JAZZ_AUDIOR_DMA:
+ printk("VDMA: Audio DMA not supported yet.\n");
+ break;
+
+ default:
+ printk
+ ("VDMA: vdma_set_mode() called with unsupported channel %d!\n",
+ channel);
+ }
+
+ switch (mode) {
+ case DMA_MODE_READ:
+ r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
+ r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
+ (channel << 5)) &
+ ~R4030_CHNL_WRITE);
+ break;
+
+ case DMA_MODE_WRITE:
+ r4030_write_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5),
+ r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE +
+ (channel << 5)) |
+ R4030_CHNL_WRITE);
+ break;
+
+ default:
+ printk
+ ("VDMA: vdma_set_mode() called with unknown dma mode 0x%x\n",
+ mode);
+ }
+}
+
+EXPORT_SYMBOL(vdma_set_mode);
+
+/*
+ * Set Transfer Address
+ */
+void vdma_set_addr(int channel, long addr)
+{
+ if (vdma_debug)
+ printk("vdma_set_addr: channel %d, addr %lx\n", channel,
+ addr);
+
+ r4030_write_reg32(JAZZ_R4030_CHNL_ADDR + (channel << 5), addr);
+}
+
+EXPORT_SYMBOL(vdma_set_addr);
+
+/*
+ * Set Transfer Count
+ */
+void vdma_set_count(int channel, int count)
+{
+ if (vdma_debug)
+ printk("vdma_set_count: channel %d, count %08x\n", channel,
+ (unsigned) count);
+
+ r4030_write_reg32(JAZZ_R4030_CHNL_COUNT + (channel << 5), count);
+}
+
+EXPORT_SYMBOL(vdma_set_count);
+
+/*
+ * Get Residual
+ */
+int vdma_get_residue(int channel)
+{
+ int residual;
+
+ residual = r4030_read_reg32(JAZZ_R4030_CHNL_COUNT + (channel << 5));
+
+ if (vdma_debug)
+ printk("vdma_get_residual: channel %d: residual=%d\n",
+ channel, residual);
+
+ return residual;
+}
+
+/*
+ * Get DMA channel enable register
+ */
+int vdma_get_enable(int channel)
+{
+ int enable;
+
+ enable = r4030_read_reg32(JAZZ_R4030_CHNL_ENABLE + (channel << 5));
+
+ if (vdma_debug)
+ printk("vdma_get_enable: channel %d: enable=%d\n", channel,
+ enable);
+
+ return enable;
+}
+
+static void *jazz_dma_alloc(struct device *dev, size_t size,
+ dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
+{
+ struct page *page;
+ void *ret;
+
+ if (attrs & DMA_ATTR_NO_WARN)
+ gfp |= __GFP_NOWARN;
+
+ size = PAGE_ALIGN(size);
+ page = alloc_pages(gfp, get_order(size));
+ if (!page)
+ return NULL;
+ ret = page_address(page);
+ memset(ret, 0, size);
+ *dma_handle = vdma_alloc(virt_to_phys(ret), size);
+ if (*dma_handle == DMA_MAPPING_ERROR)
+ goto out_free_pages;
+ arch_dma_prep_coherent(page, size);
+ return (void *)(UNCAC_BASE + __pa(ret));
+
+out_free_pages:
+ __free_pages(page, get_order(size));
+ return NULL;
+}
+
+static void jazz_dma_free(struct device *dev, size_t size, void *vaddr,
+ dma_addr_t dma_handle, unsigned long attrs)
+{
+ vdma_free(dma_handle);
+ __free_pages(virt_to_page(vaddr), get_order(size));
+}
+
+static dma_addr_t jazz_dma_map_page(struct device *dev, struct page *page,
+ unsigned long offset, size_t size, enum dma_data_direction dir,
+ unsigned long attrs)
+{
+ phys_addr_t phys = page_to_phys(page) + offset;
+
+ if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+ arch_sync_dma_for_device(phys, size, dir);
+ return vdma_alloc(phys, size);
+}
+
+static void jazz_dma_unmap_page(struct device *dev, dma_addr_t dma_addr,
+ size_t size, enum dma_data_direction dir, unsigned long attrs)
+{
+ if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+ arch_sync_dma_for_cpu(vdma_log2phys(dma_addr), size, dir);
+ vdma_free(dma_addr);
+}
+
+static int jazz_dma_map_sg(struct device *dev, struct scatterlist *sglist,
+ int nents, enum dma_data_direction dir, unsigned long attrs)
+{
+ int i;
+ struct scatterlist *sg;
+
+ for_each_sg(sglist, sg, nents, i) {
+ if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+ arch_sync_dma_for_device(sg_phys(sg), sg->length,
+ dir);
+ sg->dma_address = vdma_alloc(sg_phys(sg), sg->length);
+ if (sg->dma_address == DMA_MAPPING_ERROR)
+ return -EIO;
+ sg_dma_len(sg) = sg->length;
+ }
+
+ return nents;
+}
+
+static void jazz_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
+ int nents, enum dma_data_direction dir, unsigned long attrs)
+{
+ int i;
+ struct scatterlist *sg;
+
+ for_each_sg(sglist, sg, nents, i) {
+ if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
+ arch_sync_dma_for_cpu(sg_phys(sg), sg->length, dir);
+ vdma_free(sg->dma_address);
+ }
+}
+
+static void jazz_dma_sync_single_for_device(struct device *dev,
+ dma_addr_t addr, size_t size, enum dma_data_direction dir)
+{
+ arch_sync_dma_for_device(vdma_log2phys(addr), size, dir);
+}
+
+static void jazz_dma_sync_single_for_cpu(struct device *dev,
+ dma_addr_t addr, size_t size, enum dma_data_direction dir)
+{
+ arch_sync_dma_for_cpu(vdma_log2phys(addr), size, dir);
+}
+
+static void jazz_dma_sync_sg_for_device(struct device *dev,
+ struct scatterlist *sgl, int nents, enum dma_data_direction dir)
+{
+ struct scatterlist *sg;
+ int i;
+
+ for_each_sg(sgl, sg, nents, i)
+ arch_sync_dma_for_device(sg_phys(sg), sg->length, dir);
+}
+
+static void jazz_dma_sync_sg_for_cpu(struct device *dev,
+ struct scatterlist *sgl, int nents, enum dma_data_direction dir)
+{
+ struct scatterlist *sg;
+ int i;
+
+ for_each_sg(sgl, sg, nents, i)
+ arch_sync_dma_for_cpu(sg_phys(sg), sg->length, dir);
+}
+
+const struct dma_map_ops jazz_dma_ops = {
+ .alloc = jazz_dma_alloc,
+ .free = jazz_dma_free,
+ .map_page = jazz_dma_map_page,
+ .unmap_page = jazz_dma_unmap_page,
+ .map_sg = jazz_dma_map_sg,
+ .unmap_sg = jazz_dma_unmap_sg,
+ .sync_single_for_cpu = jazz_dma_sync_single_for_cpu,
+ .sync_single_for_device = jazz_dma_sync_single_for_device,
+ .sync_sg_for_cpu = jazz_dma_sync_sg_for_cpu,
+ .sync_sg_for_device = jazz_dma_sync_sg_for_device,
+ .mmap = dma_common_mmap,
+ .get_sgtable = dma_common_get_sgtable,
+ .alloc_pages = dma_common_alloc_pages,
+ .free_pages = dma_common_free_pages,
+};
+EXPORT_SYMBOL(jazz_dma_ops);