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![Julia Lawall](/assets/img/avatar_default.png)
Move the kfree after the iounmap that refers to the same structure. A simplified version of the semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression x,e; identifier f; iterator I; statement S; @@ *kfree(x); ... when != &x when != x = e when != I(x,...) S *x->f // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
1325 lines
31 KiB
C
1325 lines
31 KiB
C
/*
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* driver/dma/coh901318.c
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*
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* Copyright (C) 2007-2009 ST-Ericsson
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* License terms: GNU General Public License (GPL) version 2
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* DMA driver for COH 901 318
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* Author: Per Friden <per.friden@stericsson.com>
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h> /* printk() */
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#include <linux/fs.h> /* everything... */
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#include <linux/slab.h> /* kmalloc() */
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#include <linux/dmaengine.h>
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#include <linux/platform_device.h>
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#include <linux/device.h>
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#include <linux/irqreturn.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/uaccess.h>
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#include <linux/debugfs.h>
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#include <mach/coh901318.h>
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#include "coh901318_lli.h"
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#define COHC_2_DEV(cohc) (&cohc->chan.dev->device)
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#ifdef VERBOSE_DEBUG
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#define COH_DBG(x) ({ if (1) x; 0; })
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#else
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#define COH_DBG(x) ({ if (0) x; 0; })
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#endif
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struct coh901318_desc {
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struct dma_async_tx_descriptor desc;
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struct list_head node;
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struct scatterlist *sg;
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unsigned int sg_len;
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struct coh901318_lli *data;
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enum dma_data_direction dir;
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int pending_irqs;
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unsigned long flags;
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};
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struct coh901318_base {
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struct device *dev;
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void __iomem *virtbase;
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struct coh901318_pool pool;
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struct powersave pm;
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struct dma_device dma_slave;
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struct dma_device dma_memcpy;
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struct coh901318_chan *chans;
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struct coh901318_platform *platform;
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};
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struct coh901318_chan {
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spinlock_t lock;
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int allocated;
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int completed;
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int id;
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int stopped;
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struct work_struct free_work;
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struct dma_chan chan;
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struct tasklet_struct tasklet;
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struct list_head active;
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struct list_head queue;
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struct list_head free;
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unsigned long nbr_active_done;
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unsigned long busy;
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int pending_irqs;
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struct coh901318_base *base;
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};
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static void coh901318_list_print(struct coh901318_chan *cohc,
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struct coh901318_lli *lli)
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{
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struct coh901318_lli *l;
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dma_addr_t addr = virt_to_phys(lli);
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int i = 0;
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while (addr) {
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l = phys_to_virt(addr);
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dev_vdbg(COHC_2_DEV(cohc), "i %d, lli %p, ctrl 0x%x, src 0x%x"
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", dst 0x%x, link 0x%x link_virt 0x%p\n",
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i, l, l->control, l->src_addr, l->dst_addr,
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l->link_addr, phys_to_virt(l->link_addr));
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i++;
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addr = l->link_addr;
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}
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}
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#ifdef CONFIG_DEBUG_FS
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#define COH901318_DEBUGFS_ASSIGN(x, y) (x = y)
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static struct coh901318_base *debugfs_dma_base;
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static struct dentry *dma_dentry;
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static int coh901318_debugfs_open(struct inode *inode, struct file *file)
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{
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file->private_data = inode->i_private;
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return 0;
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}
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static int coh901318_debugfs_read(struct file *file, char __user *buf,
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size_t count, loff_t *f_pos)
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{
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u64 started_channels = debugfs_dma_base->pm.started_channels;
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int pool_count = debugfs_dma_base->pool.debugfs_pool_counter;
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int i;
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int ret = 0;
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char *dev_buf;
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char *tmp;
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int dev_size;
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dev_buf = kmalloc(4*1024, GFP_KERNEL);
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if (dev_buf == NULL)
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goto err_kmalloc;
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tmp = dev_buf;
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tmp += sprintf(tmp, "DMA -- enable dma channels\n");
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for (i = 0; i < debugfs_dma_base->platform->max_channels; i++)
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if (started_channels & (1 << i))
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tmp += sprintf(tmp, "channel %d\n", i);
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tmp += sprintf(tmp, "Pool alloc nbr %d\n", pool_count);
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dev_size = tmp - dev_buf;
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/* No more to read if offset != 0 */
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if (*f_pos > dev_size)
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goto out;
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if (count > dev_size - *f_pos)
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count = dev_size - *f_pos;
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if (copy_to_user(buf, dev_buf + *f_pos, count))
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ret = -EINVAL;
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ret = count;
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*f_pos += count;
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out:
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kfree(dev_buf);
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return ret;
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err_kmalloc:
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return 0;
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}
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static const struct file_operations coh901318_debugfs_status_operations = {
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.owner = THIS_MODULE,
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.open = coh901318_debugfs_open,
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.read = coh901318_debugfs_read,
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};
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static int __init init_coh901318_debugfs(void)
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{
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dma_dentry = debugfs_create_dir("dma", NULL);
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(void) debugfs_create_file("status",
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S_IFREG | S_IRUGO,
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dma_dentry, NULL,
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&coh901318_debugfs_status_operations);
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return 0;
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}
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static void __exit exit_coh901318_debugfs(void)
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{
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debugfs_remove_recursive(dma_dentry);
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}
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module_init(init_coh901318_debugfs);
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module_exit(exit_coh901318_debugfs);
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#else
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#define COH901318_DEBUGFS_ASSIGN(x, y)
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#endif /* CONFIG_DEBUG_FS */
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static inline struct coh901318_chan *to_coh901318_chan(struct dma_chan *chan)
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{
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return container_of(chan, struct coh901318_chan, chan);
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}
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static inline dma_addr_t
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cohc_dev_addr(struct coh901318_chan *cohc)
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{
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return cohc->base->platform->chan_conf[cohc->id].dev_addr;
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}
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static inline const struct coh901318_params *
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cohc_chan_param(struct coh901318_chan *cohc)
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{
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return &cohc->base->platform->chan_conf[cohc->id].param;
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}
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static inline const struct coh_dma_channel *
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cohc_chan_conf(struct coh901318_chan *cohc)
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{
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return &cohc->base->platform->chan_conf[cohc->id];
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}
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static void enable_powersave(struct coh901318_chan *cohc)
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{
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unsigned long flags;
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struct powersave *pm = &cohc->base->pm;
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spin_lock_irqsave(&pm->lock, flags);
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pm->started_channels &= ~(1ULL << cohc->id);
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if (!pm->started_channels) {
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/* DMA no longer intends to access memory */
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cohc->base->platform->access_memory_state(cohc->base->dev,
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false);
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}
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spin_unlock_irqrestore(&pm->lock, flags);
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}
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static void disable_powersave(struct coh901318_chan *cohc)
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{
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unsigned long flags;
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struct powersave *pm = &cohc->base->pm;
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spin_lock_irqsave(&pm->lock, flags);
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if (!pm->started_channels) {
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/* DMA intends to access memory */
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cohc->base->platform->access_memory_state(cohc->base->dev,
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true);
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}
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pm->started_channels |= (1ULL << cohc->id);
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spin_unlock_irqrestore(&pm->lock, flags);
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}
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static inline int coh901318_set_ctrl(struct coh901318_chan *cohc, u32 control)
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{
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int channel = cohc->id;
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void __iomem *virtbase = cohc->base->virtbase;
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writel(control,
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virtbase + COH901318_CX_CTRL +
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COH901318_CX_CTRL_SPACING * channel);
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return 0;
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}
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static inline int coh901318_set_conf(struct coh901318_chan *cohc, u32 conf)
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{
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int channel = cohc->id;
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void __iomem *virtbase = cohc->base->virtbase;
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writel(conf,
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virtbase + COH901318_CX_CFG +
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COH901318_CX_CFG_SPACING*channel);
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return 0;
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}
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static int coh901318_start(struct coh901318_chan *cohc)
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{
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u32 val;
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int channel = cohc->id;
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void __iomem *virtbase = cohc->base->virtbase;
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disable_powersave(cohc);
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val = readl(virtbase + COH901318_CX_CFG +
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COH901318_CX_CFG_SPACING * channel);
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/* Enable channel */
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val |= COH901318_CX_CFG_CH_ENABLE;
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writel(val, virtbase + COH901318_CX_CFG +
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COH901318_CX_CFG_SPACING * channel);
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return 0;
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}
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static int coh901318_prep_linked_list(struct coh901318_chan *cohc,
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struct coh901318_lli *data)
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{
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int channel = cohc->id;
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void __iomem *virtbase = cohc->base->virtbase;
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BUG_ON(readl(virtbase + COH901318_CX_STAT +
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COH901318_CX_STAT_SPACING*channel) &
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COH901318_CX_STAT_ACTIVE);
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writel(data->src_addr,
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virtbase + COH901318_CX_SRC_ADDR +
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COH901318_CX_SRC_ADDR_SPACING * channel);
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writel(data->dst_addr, virtbase +
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COH901318_CX_DST_ADDR +
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COH901318_CX_DST_ADDR_SPACING * channel);
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writel(data->link_addr, virtbase + COH901318_CX_LNK_ADDR +
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COH901318_CX_LNK_ADDR_SPACING * channel);
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writel(data->control, virtbase + COH901318_CX_CTRL +
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COH901318_CX_CTRL_SPACING * channel);
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return 0;
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}
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static dma_cookie_t
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coh901318_assign_cookie(struct coh901318_chan *cohc,
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struct coh901318_desc *cohd)
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{
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dma_cookie_t cookie = cohc->chan.cookie;
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if (++cookie < 0)
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cookie = 1;
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cohc->chan.cookie = cookie;
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cohd->desc.cookie = cookie;
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return cookie;
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}
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static struct coh901318_desc *
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coh901318_desc_get(struct coh901318_chan *cohc)
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{
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struct coh901318_desc *desc;
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if (list_empty(&cohc->free)) {
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/* alloc new desc because we're out of used ones
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* TODO: alloc a pile of descs instead of just one,
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* avoid many small allocations.
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*/
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desc = kmalloc(sizeof(struct coh901318_desc), GFP_NOWAIT);
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if (desc == NULL)
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goto out;
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INIT_LIST_HEAD(&desc->node);
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} else {
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/* Reuse an old desc. */
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desc = list_first_entry(&cohc->free,
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struct coh901318_desc,
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node);
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list_del(&desc->node);
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}
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out:
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return desc;
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}
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static void
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coh901318_desc_free(struct coh901318_chan *cohc, struct coh901318_desc *cohd)
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{
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list_add_tail(&cohd->node, &cohc->free);
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}
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/* call with irq lock held */
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static void
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coh901318_desc_submit(struct coh901318_chan *cohc, struct coh901318_desc *desc)
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{
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list_add_tail(&desc->node, &cohc->active);
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BUG_ON(cohc->pending_irqs != 0);
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cohc->pending_irqs = desc->pending_irqs;
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}
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static struct coh901318_desc *
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coh901318_first_active_get(struct coh901318_chan *cohc)
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{
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struct coh901318_desc *d;
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if (list_empty(&cohc->active))
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return NULL;
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d = list_first_entry(&cohc->active,
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struct coh901318_desc,
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node);
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return d;
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}
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static void
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coh901318_desc_remove(struct coh901318_desc *cohd)
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{
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list_del(&cohd->node);
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}
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static void
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coh901318_desc_queue(struct coh901318_chan *cohc, struct coh901318_desc *desc)
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{
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list_add_tail(&desc->node, &cohc->queue);
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}
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static struct coh901318_desc *
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coh901318_first_queued(struct coh901318_chan *cohc)
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{
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struct coh901318_desc *d;
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if (list_empty(&cohc->queue))
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return NULL;
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d = list_first_entry(&cohc->queue,
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struct coh901318_desc,
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node);
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return d;
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}
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/*
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* DMA start/stop controls
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*/
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u32 coh901318_get_bytes_left(struct dma_chan *chan)
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{
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unsigned long flags;
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u32 ret;
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struct coh901318_chan *cohc = to_coh901318_chan(chan);
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spin_lock_irqsave(&cohc->lock, flags);
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/* Read transfer count value */
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ret = readl(cohc->base->virtbase +
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COH901318_CX_CTRL+COH901318_CX_CTRL_SPACING *
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cohc->id) & COH901318_CX_CTRL_TC_VALUE_MASK;
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spin_unlock_irqrestore(&cohc->lock, flags);
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return ret;
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}
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EXPORT_SYMBOL(coh901318_get_bytes_left);
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/* Stops a transfer without losing data. Enables power save.
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Use this function in conjunction with coh901318_continue(..)
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*/
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void coh901318_stop(struct dma_chan *chan)
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{
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u32 val;
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unsigned long flags;
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struct coh901318_chan *cohc = to_coh901318_chan(chan);
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int channel = cohc->id;
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void __iomem *virtbase = cohc->base->virtbase;
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spin_lock_irqsave(&cohc->lock, flags);
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/* Disable channel in HW */
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val = readl(virtbase + COH901318_CX_CFG +
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COH901318_CX_CFG_SPACING * channel);
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/* Stopping infinit transfer */
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if ((val & COH901318_CX_CTRL_TC_ENABLE) == 0 &&
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(val & COH901318_CX_CFG_CH_ENABLE))
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cohc->stopped = 1;
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val &= ~COH901318_CX_CFG_CH_ENABLE;
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/* Enable twice, HW bug work around */
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writel(val, virtbase + COH901318_CX_CFG +
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COH901318_CX_CFG_SPACING * channel);
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writel(val, virtbase + COH901318_CX_CFG +
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COH901318_CX_CFG_SPACING * channel);
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/* Spin-wait for it to actually go inactive */
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while (readl(virtbase + COH901318_CX_STAT+COH901318_CX_STAT_SPACING *
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channel) & COH901318_CX_STAT_ACTIVE)
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cpu_relax();
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/* Check if we stopped an active job */
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if ((readl(virtbase + COH901318_CX_CTRL+COH901318_CX_CTRL_SPACING *
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channel) & COH901318_CX_CTRL_TC_VALUE_MASK) > 0)
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cohc->stopped = 1;
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enable_powersave(cohc);
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spin_unlock_irqrestore(&cohc->lock, flags);
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}
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EXPORT_SYMBOL(coh901318_stop);
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/* Continues a transfer that has been stopped via 300_dma_stop(..).
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Power save is handled.
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*/
|
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void coh901318_continue(struct dma_chan *chan)
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{
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u32 val;
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unsigned long flags;
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struct coh901318_chan *cohc = to_coh901318_chan(chan);
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int channel = cohc->id;
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spin_lock_irqsave(&cohc->lock, flags);
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disable_powersave(cohc);
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if (cohc->stopped) {
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/* Enable channel in HW */
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val = readl(cohc->base->virtbase + COH901318_CX_CFG +
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COH901318_CX_CFG_SPACING * channel);
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val |= COH901318_CX_CFG_CH_ENABLE;
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writel(val, cohc->base->virtbase + COH901318_CX_CFG +
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COH901318_CX_CFG_SPACING*channel);
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cohc->stopped = 0;
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}
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spin_unlock_irqrestore(&cohc->lock, flags);
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}
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EXPORT_SYMBOL(coh901318_continue);
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|
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bool coh901318_filter_id(struct dma_chan *chan, void *chan_id)
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{
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unsigned int ch_nr = (unsigned int) chan_id;
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|
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if (ch_nr == to_coh901318_chan(chan)->id)
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return true;
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|
|
return false;
|
|
}
|
|
EXPORT_SYMBOL(coh901318_filter_id);
|
|
|
|
/*
|
|
* DMA channel allocation
|
|
*/
|
|
static int coh901318_config(struct coh901318_chan *cohc,
|
|
struct coh901318_params *param)
|
|
{
|
|
unsigned long flags;
|
|
const struct coh901318_params *p;
|
|
int channel = cohc->id;
|
|
void __iomem *virtbase = cohc->base->virtbase;
|
|
|
|
spin_lock_irqsave(&cohc->lock, flags);
|
|
|
|
if (param)
|
|
p = param;
|
|
else
|
|
p = &cohc->base->platform->chan_conf[channel].param;
|
|
|
|
/* Clear any pending BE or TC interrupt */
|
|
if (channel < 32) {
|
|
writel(1 << channel, virtbase + COH901318_BE_INT_CLEAR1);
|
|
writel(1 << channel, virtbase + COH901318_TC_INT_CLEAR1);
|
|
} else {
|
|
writel(1 << (channel - 32), virtbase +
|
|
COH901318_BE_INT_CLEAR2);
|
|
writel(1 << (channel - 32), virtbase +
|
|
COH901318_TC_INT_CLEAR2);
|
|
}
|
|
|
|
coh901318_set_conf(cohc, p->config);
|
|
coh901318_set_ctrl(cohc, p->ctrl_lli_last);
|
|
|
|
spin_unlock_irqrestore(&cohc->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* must lock when calling this function
|
|
* start queued jobs, if any
|
|
* TODO: start all queued jobs in one go
|
|
*
|
|
* Returns descriptor if queued job is started otherwise NULL.
|
|
* If the queue is empty NULL is returned.
|
|
*/
|
|
static struct coh901318_desc *coh901318_queue_start(struct coh901318_chan *cohc)
|
|
{
|
|
struct coh901318_desc *cohd_que;
|
|
|
|
/* start queued jobs, if any
|
|
* TODO: transmit all queued jobs in one go
|
|
*/
|
|
cohd_que = coh901318_first_queued(cohc);
|
|
|
|
if (cohd_que != NULL) {
|
|
/* Remove from queue */
|
|
coh901318_desc_remove(cohd_que);
|
|
/* initiate DMA job */
|
|
cohc->busy = 1;
|
|
|
|
coh901318_desc_submit(cohc, cohd_que);
|
|
|
|
coh901318_prep_linked_list(cohc, cohd_que->data);
|
|
|
|
/* start dma job */
|
|
coh901318_start(cohc);
|
|
|
|
}
|
|
|
|
return cohd_que;
|
|
}
|
|
|
|
static void dma_tasklet(unsigned long data)
|
|
{
|
|
struct coh901318_chan *cohc = (struct coh901318_chan *) data;
|
|
struct coh901318_desc *cohd_fin;
|
|
unsigned long flags;
|
|
dma_async_tx_callback callback;
|
|
void *callback_param;
|
|
|
|
spin_lock_irqsave(&cohc->lock, flags);
|
|
|
|
/* get first active entry from list */
|
|
cohd_fin = coh901318_first_active_get(cohc);
|
|
|
|
BUG_ON(cohd_fin->pending_irqs == 0);
|
|
|
|
if (cohd_fin == NULL)
|
|
goto err;
|
|
|
|
cohd_fin->pending_irqs--;
|
|
cohc->completed = cohd_fin->desc.cookie;
|
|
|
|
BUG_ON(cohc->nbr_active_done && cohd_fin == NULL);
|
|
|
|
if (cohc->nbr_active_done == 0)
|
|
return;
|
|
|
|
if (!cohd_fin->pending_irqs) {
|
|
/* release the lli allocation*/
|
|
coh901318_lli_free(&cohc->base->pool, &cohd_fin->data);
|
|
}
|
|
|
|
dev_vdbg(COHC_2_DEV(cohc), "[%s] chan_id %d pending_irqs %d"
|
|
" nbr_active_done %ld\n", __func__,
|
|
cohc->id, cohc->pending_irqs, cohc->nbr_active_done);
|
|
|
|
/* callback to client */
|
|
callback = cohd_fin->desc.callback;
|
|
callback_param = cohd_fin->desc.callback_param;
|
|
|
|
if (!cohd_fin->pending_irqs) {
|
|
coh901318_desc_remove(cohd_fin);
|
|
|
|
/* return desc to free-list */
|
|
coh901318_desc_free(cohc, cohd_fin);
|
|
}
|
|
|
|
if (cohc->nbr_active_done)
|
|
cohc->nbr_active_done--;
|
|
|
|
if (cohc->nbr_active_done) {
|
|
if (cohc_chan_conf(cohc)->priority_high)
|
|
tasklet_hi_schedule(&cohc->tasklet);
|
|
else
|
|
tasklet_schedule(&cohc->tasklet);
|
|
}
|
|
spin_unlock_irqrestore(&cohc->lock, flags);
|
|
|
|
if (callback)
|
|
callback(callback_param);
|
|
|
|
return;
|
|
|
|
err:
|
|
spin_unlock_irqrestore(&cohc->lock, flags);
|
|
dev_err(COHC_2_DEV(cohc), "[%s] No active dma desc\n", __func__);
|
|
}
|
|
|
|
|
|
/* called from interrupt context */
|
|
static void dma_tc_handle(struct coh901318_chan *cohc)
|
|
{
|
|
BUG_ON(!cohc->allocated && (list_empty(&cohc->active) ||
|
|
list_empty(&cohc->queue)));
|
|
|
|
if (!cohc->allocated)
|
|
return;
|
|
|
|
BUG_ON(cohc->pending_irqs == 0);
|
|
|
|
cohc->pending_irqs--;
|
|
cohc->nbr_active_done++;
|
|
|
|
if (cohc->pending_irqs == 0 && coh901318_queue_start(cohc) == NULL)
|
|
cohc->busy = 0;
|
|
|
|
BUG_ON(list_empty(&cohc->active));
|
|
|
|
if (cohc_chan_conf(cohc)->priority_high)
|
|
tasklet_hi_schedule(&cohc->tasklet);
|
|
else
|
|
tasklet_schedule(&cohc->tasklet);
|
|
}
|
|
|
|
|
|
static irqreturn_t dma_irq_handler(int irq, void *dev_id)
|
|
{
|
|
u32 status1;
|
|
u32 status2;
|
|
int i;
|
|
int ch;
|
|
struct coh901318_base *base = dev_id;
|
|
struct coh901318_chan *cohc;
|
|
void __iomem *virtbase = base->virtbase;
|
|
|
|
status1 = readl(virtbase + COH901318_INT_STATUS1);
|
|
status2 = readl(virtbase + COH901318_INT_STATUS2);
|
|
|
|
if (unlikely(status1 == 0 && status2 == 0)) {
|
|
dev_warn(base->dev, "spurious DMA IRQ from no channel!\n");
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/* TODO: consider handle IRQ in tasklet here to
|
|
* minimize interrupt latency */
|
|
|
|
/* Check the first 32 DMA channels for IRQ */
|
|
while (status1) {
|
|
/* Find first bit set, return as a number. */
|
|
i = ffs(status1) - 1;
|
|
ch = i;
|
|
|
|
cohc = &base->chans[ch];
|
|
spin_lock(&cohc->lock);
|
|
|
|
/* Mask off this bit */
|
|
status1 &= ~(1 << i);
|
|
/* Check the individual channel bits */
|
|
if (test_bit(i, virtbase + COH901318_BE_INT_STATUS1)) {
|
|
dev_crit(COHC_2_DEV(cohc),
|
|
"DMA bus error on channel %d!\n", ch);
|
|
BUG_ON(1);
|
|
/* Clear BE interrupt */
|
|
__set_bit(i, virtbase + COH901318_BE_INT_CLEAR1);
|
|
} else {
|
|
/* Caused by TC, really? */
|
|
if (unlikely(!test_bit(i, virtbase +
|
|
COH901318_TC_INT_STATUS1))) {
|
|
dev_warn(COHC_2_DEV(cohc),
|
|
"ignoring interrupt not caused by terminal count on channel %d\n", ch);
|
|
/* Clear TC interrupt */
|
|
BUG_ON(1);
|
|
__set_bit(i, virtbase + COH901318_TC_INT_CLEAR1);
|
|
} else {
|
|
/* Enable powersave if transfer has finished */
|
|
if (!(readl(virtbase + COH901318_CX_STAT +
|
|
COH901318_CX_STAT_SPACING*ch) &
|
|
COH901318_CX_STAT_ENABLED)) {
|
|
enable_powersave(cohc);
|
|
}
|
|
|
|
/* Must clear TC interrupt before calling
|
|
* dma_tc_handle
|
|
* in case tc_handle initate a new dma job
|
|
*/
|
|
__set_bit(i, virtbase + COH901318_TC_INT_CLEAR1);
|
|
|
|
dma_tc_handle(cohc);
|
|
}
|
|
}
|
|
spin_unlock(&cohc->lock);
|
|
}
|
|
|
|
/* Check the remaining 32 DMA channels for IRQ */
|
|
while (status2) {
|
|
/* Find first bit set, return as a number. */
|
|
i = ffs(status2) - 1;
|
|
ch = i + 32;
|
|
cohc = &base->chans[ch];
|
|
spin_lock(&cohc->lock);
|
|
|
|
/* Mask off this bit */
|
|
status2 &= ~(1 << i);
|
|
/* Check the individual channel bits */
|
|
if (test_bit(i, virtbase + COH901318_BE_INT_STATUS2)) {
|
|
dev_crit(COHC_2_DEV(cohc),
|
|
"DMA bus error on channel %d!\n", ch);
|
|
/* Clear BE interrupt */
|
|
BUG_ON(1);
|
|
__set_bit(i, virtbase + COH901318_BE_INT_CLEAR2);
|
|
} else {
|
|
/* Caused by TC, really? */
|
|
if (unlikely(!test_bit(i, virtbase +
|
|
COH901318_TC_INT_STATUS2))) {
|
|
dev_warn(COHC_2_DEV(cohc),
|
|
"ignoring interrupt not caused by terminal count on channel %d\n", ch);
|
|
/* Clear TC interrupt */
|
|
__set_bit(i, virtbase + COH901318_TC_INT_CLEAR2);
|
|
BUG_ON(1);
|
|
} else {
|
|
/* Enable powersave if transfer has finished */
|
|
if (!(readl(virtbase + COH901318_CX_STAT +
|
|
COH901318_CX_STAT_SPACING*ch) &
|
|
COH901318_CX_STAT_ENABLED)) {
|
|
enable_powersave(cohc);
|
|
}
|
|
/* Must clear TC interrupt before calling
|
|
* dma_tc_handle
|
|
* in case tc_handle initate a new dma job
|
|
*/
|
|
__set_bit(i, virtbase + COH901318_TC_INT_CLEAR2);
|
|
|
|
dma_tc_handle(cohc);
|
|
}
|
|
}
|
|
spin_unlock(&cohc->lock);
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int coh901318_alloc_chan_resources(struct dma_chan *chan)
|
|
{
|
|
struct coh901318_chan *cohc = to_coh901318_chan(chan);
|
|
|
|
dev_vdbg(COHC_2_DEV(cohc), "[%s] DMA channel %d\n",
|
|
__func__, cohc->id);
|
|
|
|
if (chan->client_count > 1)
|
|
return -EBUSY;
|
|
|
|
coh901318_config(cohc, NULL);
|
|
|
|
cohc->allocated = 1;
|
|
cohc->completed = chan->cookie = 1;
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
coh901318_free_chan_resources(struct dma_chan *chan)
|
|
{
|
|
struct coh901318_chan *cohc = to_coh901318_chan(chan);
|
|
int channel = cohc->id;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&cohc->lock, flags);
|
|
|
|
/* Disable HW */
|
|
writel(0x00000000U, cohc->base->virtbase + COH901318_CX_CFG +
|
|
COH901318_CX_CFG_SPACING*channel);
|
|
writel(0x00000000U, cohc->base->virtbase + COH901318_CX_CTRL +
|
|
COH901318_CX_CTRL_SPACING*channel);
|
|
|
|
cohc->allocated = 0;
|
|
|
|
spin_unlock_irqrestore(&cohc->lock, flags);
|
|
|
|
chan->device->device_terminate_all(chan);
|
|
}
|
|
|
|
|
|
static dma_cookie_t
|
|
coh901318_tx_submit(struct dma_async_tx_descriptor *tx)
|
|
{
|
|
struct coh901318_desc *cohd = container_of(tx, struct coh901318_desc,
|
|
desc);
|
|
struct coh901318_chan *cohc = to_coh901318_chan(tx->chan);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&cohc->lock, flags);
|
|
|
|
tx->cookie = coh901318_assign_cookie(cohc, cohd);
|
|
|
|
coh901318_desc_queue(cohc, cohd);
|
|
|
|
spin_unlock_irqrestore(&cohc->lock, flags);
|
|
|
|
return tx->cookie;
|
|
}
|
|
|
|
static struct dma_async_tx_descriptor *
|
|
coh901318_prep_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
|
|
size_t size, unsigned long flags)
|
|
{
|
|
struct coh901318_lli *data;
|
|
struct coh901318_desc *cohd;
|
|
unsigned long flg;
|
|
struct coh901318_chan *cohc = to_coh901318_chan(chan);
|
|
int lli_len;
|
|
u32 ctrl_last = cohc_chan_param(cohc)->ctrl_lli_last;
|
|
|
|
spin_lock_irqsave(&cohc->lock, flg);
|
|
|
|
dev_vdbg(COHC_2_DEV(cohc),
|
|
"[%s] channel %d src 0x%x dest 0x%x size %d\n",
|
|
__func__, cohc->id, src, dest, size);
|
|
|
|
if (flags & DMA_PREP_INTERRUPT)
|
|
/* Trigger interrupt after last lli */
|
|
ctrl_last |= COH901318_CX_CTRL_TC_IRQ_ENABLE;
|
|
|
|
lli_len = size >> MAX_DMA_PACKET_SIZE_SHIFT;
|
|
if ((lli_len << MAX_DMA_PACKET_SIZE_SHIFT) < size)
|
|
lli_len++;
|
|
|
|
data = coh901318_lli_alloc(&cohc->base->pool, lli_len);
|
|
|
|
if (data == NULL)
|
|
goto err;
|
|
|
|
cohd = coh901318_desc_get(cohc);
|
|
cohd->sg = NULL;
|
|
cohd->sg_len = 0;
|
|
cohd->data = data;
|
|
|
|
cohd->pending_irqs =
|
|
coh901318_lli_fill_memcpy(
|
|
&cohc->base->pool, data, src, size, dest,
|
|
cohc_chan_param(cohc)->ctrl_lli_chained,
|
|
ctrl_last);
|
|
cohd->flags = flags;
|
|
|
|
COH_DBG(coh901318_list_print(cohc, data));
|
|
|
|
dma_async_tx_descriptor_init(&cohd->desc, chan);
|
|
|
|
cohd->desc.tx_submit = coh901318_tx_submit;
|
|
|
|
spin_unlock_irqrestore(&cohc->lock, flg);
|
|
|
|
return &cohd->desc;
|
|
err:
|
|
spin_unlock_irqrestore(&cohc->lock, flg);
|
|
return NULL;
|
|
}
|
|
|
|
static struct dma_async_tx_descriptor *
|
|
coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
|
|
unsigned int sg_len, enum dma_data_direction direction,
|
|
unsigned long flags)
|
|
{
|
|
struct coh901318_chan *cohc = to_coh901318_chan(chan);
|
|
struct coh901318_lli *data;
|
|
struct coh901318_desc *cohd;
|
|
struct scatterlist *sg;
|
|
int len = 0;
|
|
int size;
|
|
int i;
|
|
u32 ctrl_chained = cohc_chan_param(cohc)->ctrl_lli_chained;
|
|
u32 ctrl = cohc_chan_param(cohc)->ctrl_lli;
|
|
u32 ctrl_last = cohc_chan_param(cohc)->ctrl_lli_last;
|
|
unsigned long flg;
|
|
|
|
if (!sgl)
|
|
goto out;
|
|
if (sgl->length == 0)
|
|
goto out;
|
|
|
|
spin_lock_irqsave(&cohc->lock, flg);
|
|
|
|
dev_vdbg(COHC_2_DEV(cohc), "[%s] sg_len %d dir %d\n",
|
|
__func__, sg_len, direction);
|
|
|
|
if (flags & DMA_PREP_INTERRUPT)
|
|
/* Trigger interrupt after last lli */
|
|
ctrl_last |= COH901318_CX_CTRL_TC_IRQ_ENABLE;
|
|
|
|
cohd = coh901318_desc_get(cohc);
|
|
cohd->sg = NULL;
|
|
cohd->sg_len = 0;
|
|
cohd->dir = direction;
|
|
|
|
if (direction == DMA_TO_DEVICE) {
|
|
u32 tx_flags = COH901318_CX_CTRL_PRDD_SOURCE |
|
|
COH901318_CX_CTRL_SRC_ADDR_INC_ENABLE;
|
|
|
|
ctrl_chained |= tx_flags;
|
|
ctrl_last |= tx_flags;
|
|
ctrl |= tx_flags;
|
|
} else if (direction == DMA_FROM_DEVICE) {
|
|
u32 rx_flags = COH901318_CX_CTRL_PRDD_DEST |
|
|
COH901318_CX_CTRL_DST_ADDR_INC_ENABLE;
|
|
|
|
ctrl_chained |= rx_flags;
|
|
ctrl_last |= rx_flags;
|
|
ctrl |= rx_flags;
|
|
} else
|
|
goto err_direction;
|
|
|
|
dma_async_tx_descriptor_init(&cohd->desc, chan);
|
|
|
|
cohd->desc.tx_submit = coh901318_tx_submit;
|
|
|
|
|
|
/* The dma only supports transmitting packages up to
|
|
* MAX_DMA_PACKET_SIZE. Calculate to total number of
|
|
* dma elemts required to send the entire sg list
|
|
*/
|
|
for_each_sg(sgl, sg, sg_len, i) {
|
|
unsigned int factor;
|
|
size = sg_dma_len(sg);
|
|
|
|
if (size <= MAX_DMA_PACKET_SIZE) {
|
|
len++;
|
|
continue;
|
|
}
|
|
|
|
factor = size >> MAX_DMA_PACKET_SIZE_SHIFT;
|
|
if ((factor << MAX_DMA_PACKET_SIZE_SHIFT) < size)
|
|
factor++;
|
|
|
|
len += factor;
|
|
}
|
|
|
|
data = coh901318_lli_alloc(&cohc->base->pool, len);
|
|
|
|
if (data == NULL)
|
|
goto err_dma_alloc;
|
|
|
|
/* initiate allocated data list */
|
|
cohd->pending_irqs =
|
|
coh901318_lli_fill_sg(&cohc->base->pool, data, sgl, sg_len,
|
|
cohc_dev_addr(cohc),
|
|
ctrl_chained,
|
|
ctrl,
|
|
ctrl_last,
|
|
direction, COH901318_CX_CTRL_TC_IRQ_ENABLE);
|
|
cohd->data = data;
|
|
|
|
cohd->flags = flags;
|
|
|
|
COH_DBG(coh901318_list_print(cohc, data));
|
|
|
|
spin_unlock_irqrestore(&cohc->lock, flg);
|
|
|
|
return &cohd->desc;
|
|
err_dma_alloc:
|
|
err_direction:
|
|
coh901318_desc_remove(cohd);
|
|
coh901318_desc_free(cohc, cohd);
|
|
spin_unlock_irqrestore(&cohc->lock, flg);
|
|
out:
|
|
return NULL;
|
|
}
|
|
|
|
static enum dma_status
|
|
coh901318_is_tx_complete(struct dma_chan *chan,
|
|
dma_cookie_t cookie, dma_cookie_t *done,
|
|
dma_cookie_t *used)
|
|
{
|
|
struct coh901318_chan *cohc = to_coh901318_chan(chan);
|
|
dma_cookie_t last_used;
|
|
dma_cookie_t last_complete;
|
|
int ret;
|
|
|
|
last_complete = cohc->completed;
|
|
last_used = chan->cookie;
|
|
|
|
ret = dma_async_is_complete(cookie, last_complete, last_used);
|
|
|
|
if (done)
|
|
*done = last_complete;
|
|
if (used)
|
|
*used = last_used;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
coh901318_issue_pending(struct dma_chan *chan)
|
|
{
|
|
struct coh901318_chan *cohc = to_coh901318_chan(chan);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&cohc->lock, flags);
|
|
|
|
/* Busy means that pending jobs are already being processed */
|
|
if (!cohc->busy)
|
|
coh901318_queue_start(cohc);
|
|
|
|
spin_unlock_irqrestore(&cohc->lock, flags);
|
|
}
|
|
|
|
static void
|
|
coh901318_terminate_all(struct dma_chan *chan)
|
|
{
|
|
unsigned long flags;
|
|
struct coh901318_chan *cohc = to_coh901318_chan(chan);
|
|
struct coh901318_desc *cohd;
|
|
void __iomem *virtbase = cohc->base->virtbase;
|
|
|
|
coh901318_stop(chan);
|
|
|
|
spin_lock_irqsave(&cohc->lock, flags);
|
|
|
|
/* Clear any pending BE or TC interrupt */
|
|
if (cohc->id < 32) {
|
|
writel(1 << cohc->id, virtbase + COH901318_BE_INT_CLEAR1);
|
|
writel(1 << cohc->id, virtbase + COH901318_TC_INT_CLEAR1);
|
|
} else {
|
|
writel(1 << (cohc->id - 32), virtbase +
|
|
COH901318_BE_INT_CLEAR2);
|
|
writel(1 << (cohc->id - 32), virtbase +
|
|
COH901318_TC_INT_CLEAR2);
|
|
}
|
|
|
|
enable_powersave(cohc);
|
|
|
|
while ((cohd = coh901318_first_active_get(cohc))) {
|
|
/* release the lli allocation*/
|
|
coh901318_lli_free(&cohc->base->pool, &cohd->data);
|
|
|
|
coh901318_desc_remove(cohd);
|
|
|
|
/* return desc to free-list */
|
|
coh901318_desc_free(cohc, cohd);
|
|
}
|
|
|
|
while ((cohd = coh901318_first_queued(cohc))) {
|
|
/* release the lli allocation*/
|
|
coh901318_lli_free(&cohc->base->pool, &cohd->data);
|
|
|
|
coh901318_desc_remove(cohd);
|
|
|
|
/* return desc to free-list */
|
|
coh901318_desc_free(cohc, cohd);
|
|
}
|
|
|
|
|
|
cohc->nbr_active_done = 0;
|
|
cohc->busy = 0;
|
|
cohc->pending_irqs = 0;
|
|
|
|
spin_unlock_irqrestore(&cohc->lock, flags);
|
|
}
|
|
void coh901318_base_init(struct dma_device *dma, const int *pick_chans,
|
|
struct coh901318_base *base)
|
|
{
|
|
int chans_i;
|
|
int i = 0;
|
|
struct coh901318_chan *cohc;
|
|
|
|
INIT_LIST_HEAD(&dma->channels);
|
|
|
|
for (chans_i = 0; pick_chans[chans_i] != -1; chans_i += 2) {
|
|
for (i = pick_chans[chans_i]; i <= pick_chans[chans_i+1]; i++) {
|
|
cohc = &base->chans[i];
|
|
|
|
cohc->base = base;
|
|
cohc->chan.device = dma;
|
|
cohc->id = i;
|
|
|
|
/* TODO: do we really need this lock if only one
|
|
* client is connected to each channel?
|
|
*/
|
|
|
|
spin_lock_init(&cohc->lock);
|
|
|
|
cohc->pending_irqs = 0;
|
|
cohc->nbr_active_done = 0;
|
|
cohc->busy = 0;
|
|
INIT_LIST_HEAD(&cohc->free);
|
|
INIT_LIST_HEAD(&cohc->active);
|
|
INIT_LIST_HEAD(&cohc->queue);
|
|
|
|
tasklet_init(&cohc->tasklet, dma_tasklet,
|
|
(unsigned long) cohc);
|
|
|
|
list_add_tail(&cohc->chan.device_node,
|
|
&dma->channels);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int __init coh901318_probe(struct platform_device *pdev)
|
|
{
|
|
int err = 0;
|
|
struct coh901318_platform *pdata;
|
|
struct coh901318_base *base;
|
|
int irq;
|
|
struct resource *io;
|
|
|
|
io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!io)
|
|
goto err_get_resource;
|
|
|
|
/* Map DMA controller registers to virtual memory */
|
|
if (request_mem_region(io->start,
|
|
resource_size(io),
|
|
pdev->dev.driver->name) == NULL) {
|
|
err = -EBUSY;
|
|
goto err_request_mem;
|
|
}
|
|
|
|
pdata = pdev->dev.platform_data;
|
|
if (!pdata)
|
|
goto err_no_platformdata;
|
|
|
|
base = kmalloc(ALIGN(sizeof(struct coh901318_base), 4) +
|
|
pdata->max_channels *
|
|
sizeof(struct coh901318_chan),
|
|
GFP_KERNEL);
|
|
if (!base)
|
|
goto err_alloc_coh_dma_channels;
|
|
|
|
base->chans = ((void *)base) + ALIGN(sizeof(struct coh901318_base), 4);
|
|
|
|
base->virtbase = ioremap(io->start, resource_size(io));
|
|
if (!base->virtbase) {
|
|
err = -ENOMEM;
|
|
goto err_no_ioremap;
|
|
}
|
|
|
|
base->dev = &pdev->dev;
|
|
base->platform = pdata;
|
|
spin_lock_init(&base->pm.lock);
|
|
base->pm.started_channels = 0;
|
|
|
|
COH901318_DEBUGFS_ASSIGN(debugfs_dma_base, base);
|
|
|
|
platform_set_drvdata(pdev, base);
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq < 0)
|
|
goto err_no_irq;
|
|
|
|
err = request_irq(irq, dma_irq_handler, IRQF_DISABLED,
|
|
"coh901318", base);
|
|
if (err) {
|
|
dev_crit(&pdev->dev,
|
|
"Cannot allocate IRQ for DMA controller!\n");
|
|
goto err_request_irq;
|
|
}
|
|
|
|
err = coh901318_pool_create(&base->pool, &pdev->dev,
|
|
sizeof(struct coh901318_lli),
|
|
32);
|
|
if (err)
|
|
goto err_pool_create;
|
|
|
|
/* init channels for device transfers */
|
|
coh901318_base_init(&base->dma_slave, base->platform->chans_slave,
|
|
base);
|
|
|
|
dma_cap_zero(base->dma_slave.cap_mask);
|
|
dma_cap_set(DMA_SLAVE, base->dma_slave.cap_mask);
|
|
|
|
base->dma_slave.device_alloc_chan_resources = coh901318_alloc_chan_resources;
|
|
base->dma_slave.device_free_chan_resources = coh901318_free_chan_resources;
|
|
base->dma_slave.device_prep_slave_sg = coh901318_prep_slave_sg;
|
|
base->dma_slave.device_is_tx_complete = coh901318_is_tx_complete;
|
|
base->dma_slave.device_issue_pending = coh901318_issue_pending;
|
|
base->dma_slave.device_terminate_all = coh901318_terminate_all;
|
|
base->dma_slave.dev = &pdev->dev;
|
|
|
|
err = dma_async_device_register(&base->dma_slave);
|
|
|
|
if (err)
|
|
goto err_register_slave;
|
|
|
|
/* init channels for memcpy */
|
|
coh901318_base_init(&base->dma_memcpy, base->platform->chans_memcpy,
|
|
base);
|
|
|
|
dma_cap_zero(base->dma_memcpy.cap_mask);
|
|
dma_cap_set(DMA_MEMCPY, base->dma_memcpy.cap_mask);
|
|
|
|
base->dma_memcpy.device_alloc_chan_resources = coh901318_alloc_chan_resources;
|
|
base->dma_memcpy.device_free_chan_resources = coh901318_free_chan_resources;
|
|
base->dma_memcpy.device_prep_dma_memcpy = coh901318_prep_memcpy;
|
|
base->dma_memcpy.device_is_tx_complete = coh901318_is_tx_complete;
|
|
base->dma_memcpy.device_issue_pending = coh901318_issue_pending;
|
|
base->dma_memcpy.device_terminate_all = coh901318_terminate_all;
|
|
base->dma_memcpy.dev = &pdev->dev;
|
|
err = dma_async_device_register(&base->dma_memcpy);
|
|
|
|
if (err)
|
|
goto err_register_memcpy;
|
|
|
|
dev_dbg(&pdev->dev, "Initialized COH901318 DMA on virtual base 0x%08x\n",
|
|
(u32) base->virtbase);
|
|
|
|
return err;
|
|
|
|
err_register_memcpy:
|
|
dma_async_device_unregister(&base->dma_slave);
|
|
err_register_slave:
|
|
coh901318_pool_destroy(&base->pool);
|
|
err_pool_create:
|
|
free_irq(platform_get_irq(pdev, 0), base);
|
|
err_request_irq:
|
|
err_no_irq:
|
|
iounmap(base->virtbase);
|
|
err_no_ioremap:
|
|
kfree(base);
|
|
err_alloc_coh_dma_channels:
|
|
err_no_platformdata:
|
|
release_mem_region(pdev->resource->start,
|
|
resource_size(pdev->resource));
|
|
err_request_mem:
|
|
err_get_resource:
|
|
return err;
|
|
}
|
|
|
|
static int __exit coh901318_remove(struct platform_device *pdev)
|
|
{
|
|
struct coh901318_base *base = platform_get_drvdata(pdev);
|
|
|
|
dma_async_device_unregister(&base->dma_memcpy);
|
|
dma_async_device_unregister(&base->dma_slave);
|
|
coh901318_pool_destroy(&base->pool);
|
|
free_irq(platform_get_irq(pdev, 0), base);
|
|
iounmap(base->virtbase);
|
|
kfree(base);
|
|
release_mem_region(pdev->resource->start,
|
|
resource_size(pdev->resource));
|
|
return 0;
|
|
}
|
|
|
|
|
|
static struct platform_driver coh901318_driver = {
|
|
.remove = __exit_p(coh901318_remove),
|
|
.driver = {
|
|
.name = "coh901318",
|
|
},
|
|
};
|
|
|
|
int __init coh901318_init(void)
|
|
{
|
|
return platform_driver_probe(&coh901318_driver, coh901318_probe);
|
|
}
|
|
subsys_initcall(coh901318_init);
|
|
|
|
void __exit coh901318_exit(void)
|
|
{
|
|
platform_driver_unregister(&coh901318_driver);
|
|
}
|
|
module_exit(coh901318_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Per Friden");
|