+++ /dev/null
-/*
- * linux/arch/arm/plat-pxa/dma.c
- *
- * PXA DMA registration and IRQ dispatching
- *
- * Author: Nicolas Pitre
- * Created: Nov 15, 2001
- * Copyright: MontaVista Software Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/slab.h>
-#include <linux/kernel.h>
-#include <linux/interrupt.h>
-#include <linux/errno.h>
-#include <linux/dma-mapping.h>
-
-#include <asm/irq.h>
-#include <asm/memory.h>
-#include <mach/hardware.h>
-#include <mach/dma.h>
-
-#define DMA_DEBUG_NAME "pxa_dma"
-#define DMA_MAX_REQUESTERS 64
-
-struct dma_channel {
- char *name;
- pxa_dma_prio prio;
- void (*irq_handler)(int, void *);
- void *data;
- spinlock_t lock;
-};
-
-static struct dma_channel *dma_channels;
-static int num_dma_channels;
-
-/*
- * Debug fs
- */
-#ifdef CONFIG_DEBUG_FS
-#include <linux/debugfs.h>
-#include <linux/uaccess.h>
-#include <linux/seq_file.h>
-
-static struct dentry *dbgfs_root, *dbgfs_state, **dbgfs_chan;
-
-static int dbg_show_requester_chan(struct seq_file *s, void *p)
-{
- int chan = (int)s->private;
- int i;
- u32 drcmr;
-
- seq_printf(s, "DMA channel %d requesters list :\n", chan);
- for (i = 0; i < DMA_MAX_REQUESTERS; i++) {
- drcmr = DRCMR(i);
- if ((drcmr & DRCMR_CHLNUM) == chan)
- seq_printf(s, "\tRequester %d (MAPVLD=%d)\n",
- i, !!(drcmr & DRCMR_MAPVLD));
- }
-
- return 0;
-}
-
-static inline int dbg_burst_from_dcmd(u32 dcmd)
-{
- int burst = (dcmd >> 16) & 0x3;
-
- return burst ? 4 << burst : 0;
-}
-
-static int is_phys_valid(unsigned long addr)
-{
- return pfn_valid(__phys_to_pfn(addr));
-}
-
-#define DCSR_STR(flag) (dcsr & DCSR_##flag ? #flag" " : "")
-#define DCMD_STR(flag) (dcmd & DCMD_##flag ? #flag" " : "")
-
-static int dbg_show_descriptors(struct seq_file *s, void *p)
-{
- int chan = (int)s->private;
- int i, max_show = 20, burst, width;
- u32 dcmd;
- unsigned long phys_desc;
- struct pxa_dma_desc *desc;
- unsigned long flags;
-
- spin_lock_irqsave(&dma_channels[chan].lock, flags);
- phys_desc = DDADR(chan);
-
- seq_printf(s, "DMA channel %d descriptors :\n", chan);
- seq_printf(s, "[%03d] First descriptor unknown\n", 0);
- for (i = 1; i < max_show && is_phys_valid(phys_desc); i++) {
- desc = phys_to_virt(phys_desc);
- dcmd = desc->dcmd;
- burst = dbg_burst_from_dcmd(dcmd);
- width = (1 << ((dcmd >> 14) & 0x3)) >> 1;
-
- seq_printf(s, "[%03d] Desc at %08lx(virt %p)\n",
- i, phys_desc, desc);
- seq_printf(s, "\tDDADR = %08x\n", desc->ddadr);
- seq_printf(s, "\tDSADR = %08x\n", desc->dsadr);
- seq_printf(s, "\tDTADR = %08x\n", desc->dtadr);
- seq_printf(s, "\tDCMD = %08x (%s%s%s%s%s%s%sburst=%d width=%d len=%d)\n",
- dcmd,
- DCMD_STR(INCSRCADDR), DCMD_STR(INCTRGADDR),
- DCMD_STR(FLOWSRC), DCMD_STR(FLOWTRG),
- DCMD_STR(STARTIRQEN), DCMD_STR(ENDIRQEN),
- DCMD_STR(ENDIAN), burst, width,
- dcmd & DCMD_LENGTH);
- phys_desc = desc->ddadr;
- }
- if (i == max_show)
- seq_printf(s, "[%03d] Desc at %08lx ... max display reached\n",
- i, phys_desc);
- else
- seq_printf(s, "[%03d] Desc at %08lx is %s\n",
- i, phys_desc, phys_desc == DDADR_STOP ?
- "DDADR_STOP" : "invalid");
-
- spin_unlock_irqrestore(&dma_channels[chan].lock, flags);
-
- return 0;
-}
-
-static int dbg_show_chan_state(struct seq_file *s, void *p)
-{
- int chan = (int)s->private;
- u32 dcsr, dcmd;
- int burst, width;
- static char *str_prio[] = { "high", "normal", "low" };
-
- dcsr = DCSR(chan);
- dcmd = DCMD(chan);
- burst = dbg_burst_from_dcmd(dcmd);
- width = (1 << ((dcmd >> 14) & 0x3)) >> 1;
-
- seq_printf(s, "DMA channel %d\n", chan);
- seq_printf(s, "\tPriority : %s\n", str_prio[dma_channels[chan].prio]);
- seq_printf(s, "\tUnaligned transfer bit: %s\n",
- DALGN & (1 << chan) ? "yes" : "no");
- seq_printf(s, "\tDCSR = %08x (%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s)\n",
- dcsr, DCSR_STR(RUN), DCSR_STR(NODESC),
- DCSR_STR(STOPIRQEN), DCSR_STR(EORIRQEN),
- DCSR_STR(EORJMPEN), DCSR_STR(EORSTOPEN),
- DCSR_STR(SETCMPST), DCSR_STR(CLRCMPST),
- DCSR_STR(CMPST), DCSR_STR(EORINTR), DCSR_STR(REQPEND),
- DCSR_STR(STOPSTATE), DCSR_STR(ENDINTR),
- DCSR_STR(STARTINTR), DCSR_STR(BUSERR));
-
- seq_printf(s, "\tDCMD = %08x (%s%s%s%s%s%s%sburst=%d width=%d len=%d)\n",
- dcmd,
- DCMD_STR(INCSRCADDR), DCMD_STR(INCTRGADDR),
- DCMD_STR(FLOWSRC), DCMD_STR(FLOWTRG),
- DCMD_STR(STARTIRQEN), DCMD_STR(ENDIRQEN),
- DCMD_STR(ENDIAN), burst, width, dcmd & DCMD_LENGTH);
- seq_printf(s, "\tDSADR = %08x\n", DSADR(chan));
- seq_printf(s, "\tDTADR = %08x\n", DTADR(chan));
- seq_printf(s, "\tDDADR = %08x\n", DDADR(chan));
-
- return 0;
-}
-
-static int dbg_show_state(struct seq_file *s, void *p)
-{
- /* basic device status */
- seq_puts(s, "DMA engine status\n");
- seq_printf(s, "\tChannel number: %d\n", num_dma_channels);
-
- return 0;
-}
-
-#define DBGFS_FUNC_DECL(name) \
-static int dbg_open_##name(struct inode *inode, struct file *file) \
-{ \
- return single_open(file, dbg_show_##name, inode->i_private); \
-} \
-static const struct file_operations dbg_fops_##name = { \
- .owner = THIS_MODULE, \
- .open = dbg_open_##name, \
- .llseek = seq_lseek, \
- .read = seq_read, \
- .release = single_release, \
-}
-
-DBGFS_FUNC_DECL(state);
-DBGFS_FUNC_DECL(chan_state);
-DBGFS_FUNC_DECL(descriptors);
-DBGFS_FUNC_DECL(requester_chan);
-
-static struct dentry *pxa_dma_dbg_alloc_chan(int ch, struct dentry *chandir)
-{
- char chan_name[11];
- struct dentry *chan, *chan_state = NULL, *chan_descr = NULL;
- struct dentry *chan_reqs = NULL;
- void *dt;
-
- scnprintf(chan_name, sizeof(chan_name), "%d", ch);
- chan = debugfs_create_dir(chan_name, chandir);
- dt = (void *)ch;
-
- if (chan)
- chan_state = debugfs_create_file("state", 0400, chan, dt,
- &dbg_fops_chan_state);
- if (chan_state)
- chan_descr = debugfs_create_file("descriptors", 0400, chan, dt,
- &dbg_fops_descriptors);
- if (chan_descr)
- chan_reqs = debugfs_create_file("requesters", 0400, chan, dt,
- &dbg_fops_requester_chan);
- if (!chan_reqs)
- goto err_state;
-
- return chan;
-
-err_state:
- debugfs_remove_recursive(chan);
- return NULL;
-}
-
-static void pxa_dma_init_debugfs(void)
-{
- int i;
- struct dentry *chandir;
-
- dbgfs_root = debugfs_create_dir(DMA_DEBUG_NAME, NULL);
- if (IS_ERR(dbgfs_root) || !dbgfs_root)
- goto err_root;
-
- dbgfs_state = debugfs_create_file("state", 0400, dbgfs_root, NULL,
- &dbg_fops_state);
- if (!dbgfs_state)
- goto err_state;
-
- dbgfs_chan = kmalloc(sizeof(*dbgfs_state) * num_dma_channels,
- GFP_KERNEL);
- if (!dbgfs_chan)
- goto err_alloc;
-
- chandir = debugfs_create_dir("channels", dbgfs_root);
- if (!chandir)
- goto err_chandir;
-
- for (i = 0; i < num_dma_channels; i++) {
- dbgfs_chan[i] = pxa_dma_dbg_alloc_chan(i, chandir);
- if (!dbgfs_chan[i])
- goto err_chans;
- }
-
- return;
-err_chans:
-err_chandir:
- kfree(dbgfs_chan);
-err_alloc:
-err_state:
- debugfs_remove_recursive(dbgfs_root);
-err_root:
- pr_err("pxa_dma: debugfs is not available\n");
-}
-
-static void __exit pxa_dma_cleanup_debugfs(void)
-{
- debugfs_remove_recursive(dbgfs_root);
-}
-#else
-static inline void pxa_dma_init_debugfs(void) {}
-static inline void pxa_dma_cleanup_debugfs(void) {}
-#endif
-
-int pxa_request_dma (char *name, pxa_dma_prio prio,
- void (*irq_handler)(int, void *),
- void *data)
-{
- unsigned long flags;
- int i, found = 0;
-
- /* basic sanity checks */
- if (!name || !irq_handler)
- return -EINVAL;
-
- local_irq_save(flags);
-
- do {
- /* try grabbing a DMA channel with the requested priority */
- for (i = 0; i < num_dma_channels; i++) {
- if ((dma_channels[i].prio == prio) &&
- !dma_channels[i].name &&
- !pxad_toggle_reserved_channel(i)) {
- found = 1;
- break;
- }
- }
- /* if requested prio group is full, try a hier priority */
- } while (!found && prio--);
-
- if (found) {
- DCSR(i) = DCSR_STARTINTR|DCSR_ENDINTR|DCSR_BUSERR;
- dma_channels[i].name = name;
- dma_channels[i].irq_handler = irq_handler;
- dma_channels[i].data = data;
- } else {
- printk (KERN_WARNING "No more available DMA channels for %s\n", name);
- i = -ENODEV;
- }
-
- local_irq_restore(flags);
- return i;
-}
-EXPORT_SYMBOL(pxa_request_dma);
-
-void pxa_free_dma (int dma_ch)
-{
- unsigned long flags;
-
- if (!dma_channels[dma_ch].name) {
- printk (KERN_CRIT
- "%s: trying to free channel %d which is already freed\n",
- __func__, dma_ch);
- return;
- }
-
- local_irq_save(flags);
- DCSR(dma_ch) = DCSR_STARTINTR|DCSR_ENDINTR|DCSR_BUSERR;
- dma_channels[dma_ch].name = NULL;
- pxad_toggle_reserved_channel(dma_ch);
- local_irq_restore(flags);
-}
-EXPORT_SYMBOL(pxa_free_dma);
-
-static irqreturn_t dma_irq_handler(int irq, void *dev_id)
-{
- int i, dint = DINT, done = 0;
- struct dma_channel *channel;
-
- while (dint) {
- i = __ffs(dint);
- dint &= (dint - 1);
- channel = &dma_channels[i];
- if (channel->name && channel->irq_handler) {
- channel->irq_handler(i, channel->data);
- done++;
- }
- }
- if (done)
- return IRQ_HANDLED;
- else
- return IRQ_NONE;
-}
-
-int __init pxa_init_dma(int irq, int num_ch)
-{
- int i, ret;
-
- dma_channels = kzalloc(sizeof(struct dma_channel) * num_ch, GFP_KERNEL);
- if (dma_channels == NULL)
- return -ENOMEM;
-
- /* dma channel priorities on pxa2xx processors:
- * ch 0 - 3, 16 - 19 <--> (0) DMA_PRIO_HIGH
- * ch 4 - 7, 20 - 23 <--> (1) DMA_PRIO_MEDIUM
- * ch 8 - 15, 24 - 31 <--> (2) DMA_PRIO_LOW
- */
- for (i = 0; i < num_ch; i++) {
- DCSR(i) = 0;
- dma_channels[i].prio = min((i & 0xf) >> 2, DMA_PRIO_LOW);
- spin_lock_init(&dma_channels[i].lock);
- }
-
- ret = request_irq(irq, dma_irq_handler, IRQF_SHARED, "DMA",
- dma_channels);
- if (ret) {
- printk (KERN_CRIT "Wow! Can't register IRQ for DMA\n");
- kfree(dma_channels);
- return ret;
- }
- num_dma_channels = num_ch;
-
- pxa_dma_init_debugfs();
-
- return 0;
-}
+++ /dev/null
-#ifndef __PLAT_DMA_H
-#define __PLAT_DMA_H
-
-#define DMAC_REG(x) (*((volatile u32 *)(DMAC_REGS_VIRT + (x))))
-
-#define DCSR(n) DMAC_REG((n) << 2)
-#define DALGN DMAC_REG(0x00a0) /* DMA Alignment Register */
-#define DINT DMAC_REG(0x00f0) /* DMA Interrupt Register */
-#define DDADR(n) DMAC_REG(0x0200 + ((n) << 4))
-#define DSADR(n) DMAC_REG(0x0204 + ((n) << 4))
-#define DTADR(n) DMAC_REG(0x0208 + ((n) << 4))
-#define DCMD(n) DMAC_REG(0x020c + ((n) << 4))
-#define DRCMR(n) DMAC_REG((((n) < 64) ? 0x0100 : 0x1100) + \
- (((n) & 0x3f) << 2))
-
-#define DCSR_RUN (1 << 31) /* Run Bit (read / write) */
-#define DCSR_NODESC (1 << 30) /* No-Descriptor Fetch (read / write) */
-#define DCSR_STOPIRQEN (1 << 29) /* Stop Interrupt Enable (read / write) */
-#define DCSR_REQPEND (1 << 8) /* Request Pending (read-only) */
-#define DCSR_STOPSTATE (1 << 3) /* Stop State (read-only) */
-#define DCSR_ENDINTR (1 << 2) /* End Interrupt (read / write) */
-#define DCSR_STARTINTR (1 << 1) /* Start Interrupt (read / write) */
-#define DCSR_BUSERR (1 << 0) /* Bus Error Interrupt (read / write) */
-
-#define DCSR_EORIRQEN (1 << 28) /* End of Receive Interrupt Enable (R/W) */
-#define DCSR_EORJMPEN (1 << 27) /* Jump to next descriptor on EOR */
-#define DCSR_EORSTOPEN (1 << 26) /* STOP on an EOR */
-#define DCSR_SETCMPST (1 << 25) /* Set Descriptor Compare Status */
-#define DCSR_CLRCMPST (1 << 24) /* Clear Descriptor Compare Status */
-#define DCSR_CMPST (1 << 10) /* The Descriptor Compare Status */
-#define DCSR_EORINTR (1 << 9) /* The end of Receive */
-
-#define DRCMR_MAPVLD (1 << 7) /* Map Valid (read / write) */
-#define DRCMR_CHLNUM 0x1f /* mask for Channel Number (read / write) */
-
-#define DDADR_DESCADDR 0xfffffff0 /* Address of next descriptor (mask) */
-#define DDADR_STOP (1 << 0) /* Stop (read / write) */
-
-#define DCMD_INCSRCADDR (1 << 31) /* Source Address Increment Setting. */
-#define DCMD_INCTRGADDR (1 << 30) /* Target Address Increment Setting. */
-#define DCMD_FLOWSRC (1 << 29) /* Flow Control by the source. */
-#define DCMD_FLOWTRG (1 << 28) /* Flow Control by the target. */
-#define DCMD_STARTIRQEN (1 << 22) /* Start Interrupt Enable */
-#define DCMD_ENDIRQEN (1 << 21) /* End Interrupt Enable */
-#define DCMD_ENDIAN (1 << 18) /* Device Endian-ness. */
-#define DCMD_BURST8 (1 << 16) /* 8 byte burst */
-#define DCMD_BURST16 (2 << 16) /* 16 byte burst */
-#define DCMD_BURST32 (3 << 16) /* 32 byte burst */
-#define DCMD_WIDTH1 (1 << 14) /* 1 byte width */
-#define DCMD_WIDTH2 (2 << 14) /* 2 byte width (HalfWord) */
-#define DCMD_WIDTH4 (3 << 14) /* 4 byte width (Word) */
-#define DCMD_LENGTH 0x01fff /* length mask (max = 8K - 1) */
-
-/*
- * Descriptor structure for PXA's DMA engine
- * Note: this structure must always be aligned to a 16-byte boundary.
- */
-
-typedef struct pxa_dma_desc {
- volatile u32 ddadr; /* Points to the next descriptor + flags */
- volatile u32 dsadr; /* DSADR value for the current transfer */
- volatile u32 dtadr; /* DTADR value for the current transfer */
- volatile u32 dcmd; /* DCMD value for the current transfer */
-} pxa_dma_desc;
-
-typedef enum {
- DMA_PRIO_HIGH = 0,
- DMA_PRIO_MEDIUM = 1,
- DMA_PRIO_LOW = 2
-} pxa_dma_prio;
-
-/*
- * DMA registration
- */
-
-int __init pxa_init_dma(int irq, int num_ch);
-
-int pxa_request_dma (char *name,
- pxa_dma_prio prio,
- void (*irq_handler)(int, void *),
- void *data);
-
-void pxa_free_dma (int dma_ch);
-
-/*
- * Cooperation with pxa_dma + dmaengine while there remains at least one pxa
- * driver not converted to dmaengine.
- */
-#if defined(CONFIG_PXA_DMA)
-extern int pxad_toggle_reserved_channel(int legacy_channel);
-#else
-static inline int pxad_toggle_reserved_channel(int legacy_channel)
-{
- return 0;
-}
-#endif
-
-extern void __init pxa2xx_set_dmac_info(int nb_channels, int nb_requestors);
-
-#endif /* __PLAT_DMA_H */
projects / cascardo / linux.git / commitdiff