diff options
Diffstat (limited to 'arch/arm/plat-pxa/dma.c')
| -rw-r--r-- | arch/arm/plat-pxa/dma.c | 386 |
1 files changed, 0 insertions, 386 deletions
diff --git a/arch/arm/plat-pxa/dma.c b/arch/arm/plat-pxa/dma.c deleted file mode 100644 index de2b061889ec..000000000000 --- a/arch/arm/plat-pxa/dma.c +++ /dev/null @@ -1,386 +0,0 @@ -/* - * 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; -} |