diff options
Diffstat (limited to 'arch/mips/jazz/jazzdma.c')
| -rw-r--r-- | arch/mips/jazz/jazzdma.c | 623 |
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 000000000..eabddb89d --- /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); |