aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-pnx4008/dma.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-pnx4008/dma.c')
-rw-r--r--arch/arm/mach-pnx4008/dma.c1105
1 files changed, 0 insertions, 1105 deletions
diff --git a/arch/arm/mach-pnx4008/dma.c b/arch/arm/mach-pnx4008/dma.c
deleted file mode 100644
index a4739e9fb2fb..000000000000
--- a/arch/arm/mach-pnx4008/dma.c
+++ /dev/null
@@ -1,1105 +0,0 @@
-/*
- * linux/arch/arm/mach-pnx4008/dma.c
- *
- * PNX4008 DMA registration and IRQ dispatching
- *
- * Author: Vitaly Wool
- * Copyright: MontaVista Software Inc. (c) 2005
- *
- * Based on the code from Nicolas Pitre
- *
- * 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/kernel.h>
-#include <linux/interrupt.h>
-#include <linux/errno.h>
-#include <linux/err.h>
-#include <linux/dma-mapping.h>
-#include <linux/clk.h>
-#include <linux/io.h>
-#include <linux/gfp.h>
-
-#include <mach/hardware.h>
-#include <mach/dma.h>
-#include <asm/dma-mapping.h>
-#include <mach/clock.h>
-
-static struct dma_channel {
- char *name;
- void (*irq_handler) (int, int, void *);
- void *data;
- struct pnx4008_dma_ll *ll;
- u32 ll_dma;
- void *target_addr;
- int target_id;
-} dma_channels[MAX_DMA_CHANNELS];
-
-static struct ll_pool {
- void *vaddr;
- void *cur;
- dma_addr_t dma_addr;
- int count;
-} ll_pool;
-
-static DEFINE_SPINLOCK(ll_lock);
-
-struct pnx4008_dma_ll *pnx4008_alloc_ll_entry(dma_addr_t * ll_dma)
-{
- struct pnx4008_dma_ll *ll = NULL;
- unsigned long flags;
-
- spin_lock_irqsave(&ll_lock, flags);
- if (ll_pool.count > 4) { /* can give one more */
- ll = *(struct pnx4008_dma_ll **) ll_pool.cur;
- *ll_dma = ll_pool.dma_addr + ((void *)ll - ll_pool.vaddr);
- *(void **)ll_pool.cur = **(void ***)ll_pool.cur;
- memset(ll, 0, sizeof(*ll));
- ll_pool.count--;
- }
- spin_unlock_irqrestore(&ll_lock, flags);
-
- return ll;
-}
-
-EXPORT_SYMBOL_GPL(pnx4008_alloc_ll_entry);
-
-void pnx4008_free_ll_entry(struct pnx4008_dma_ll * ll, dma_addr_t ll_dma)
-{
- unsigned long flags;
-
- if (ll) {
- if ((unsigned long)((long)ll - (long)ll_pool.vaddr) > 0x4000) {
- printk(KERN_ERR "Trying to free entry not allocated by DMA\n");
- BUG();
- }
-
- if (ll->flags & DMA_BUFFER_ALLOCATED)
- ll->free(ll->alloc_data);
-
- spin_lock_irqsave(&ll_lock, flags);
- *(long *)ll = *(long *)ll_pool.cur;
- *(long *)ll_pool.cur = (long)ll;
- ll_pool.count++;
- spin_unlock_irqrestore(&ll_lock, flags);
- }
-}
-
-EXPORT_SYMBOL_GPL(pnx4008_free_ll_entry);
-
-void pnx4008_free_ll(u32 ll_dma, struct pnx4008_dma_ll * ll)
-{
- struct pnx4008_dma_ll *ptr;
- u32 dma;
-
- while (ll) {
- dma = ll->next_dma;
- ptr = ll->next;
- pnx4008_free_ll_entry(ll, ll_dma);
-
- ll_dma = dma;
- ll = ptr;
- }
-}
-
-EXPORT_SYMBOL_GPL(pnx4008_free_ll);
-
-static int dma_channels_requested = 0;
-
-static inline void dma_increment_usage(void)
-{
- if (!dma_channels_requested++) {
- struct clk *clk = clk_get(0, "dma_ck");
- if (!IS_ERR(clk)) {
- clk_set_rate(clk, 1);
- clk_put(clk);
- }
- pnx4008_config_dma(-1, -1, 1);
- }
-}
-static inline void dma_decrement_usage(void)
-{
- if (!--dma_channels_requested) {
- struct clk *clk = clk_get(0, "dma_ck");
- if (!IS_ERR(clk)) {
- clk_set_rate(clk, 0);
- clk_put(clk);
- }
- pnx4008_config_dma(-1, -1, 0);
-
- }
-}
-
-static DEFINE_SPINLOCK(dma_lock);
-
-static inline void pnx4008_dma_lock(void)
-{
- spin_lock_irq(&dma_lock);
-}
-
-static inline void pnx4008_dma_unlock(void)
-{
- spin_unlock_irq(&dma_lock);
-}
-
-#define VALID_CHANNEL(c) (((c) >= 0) && ((c) < MAX_DMA_CHANNELS))
-
-int pnx4008_request_channel(char *name, int ch,
- void (*irq_handler) (int, int, void *), void *data)
-{
- int i, found = 0;
-
- /* basic sanity checks */
- if (!name || (ch != -1 && !VALID_CHANNEL(ch)))
- return -EINVAL;
-
- pnx4008_dma_lock();
-
- /* try grabbing a DMA channel with the requested priority */
- for (i = MAX_DMA_CHANNELS - 1; i >= 0; i--) {
- if (!dma_channels[i].name && (ch == -1 || ch == i)) {
- found = 1;
- break;
- }
- }
-
- if (found) {
- dma_increment_usage();
- dma_channels[i].name = name;
- dma_channels[i].irq_handler = irq_handler;
- dma_channels[i].data = data;
- dma_channels[i].ll = NULL;
- dma_channels[i].ll_dma = 0;
- } else {
- printk(KERN_WARNING "No more available DMA channels for %s\n",
- name);
- i = -ENODEV;
- }
-
- pnx4008_dma_unlock();
- return i;
-}
-
-EXPORT_SYMBOL_GPL(pnx4008_request_channel);
-
-void pnx4008_free_channel(int ch)
-{
- if (!dma_channels[ch].name) {
- printk(KERN_CRIT
- "%s: trying to free channel %d which is already freed\n",
- __func__, ch);
- return;
- }
-
- pnx4008_dma_lock();
- pnx4008_free_ll(dma_channels[ch].ll_dma, dma_channels[ch].ll);
- dma_channels[ch].ll = NULL;
- dma_decrement_usage();
-
- dma_channels[ch].name = NULL;
- pnx4008_dma_unlock();
-}
-
-EXPORT_SYMBOL_GPL(pnx4008_free_channel);
-
-int pnx4008_config_dma(int ahb_m1_be, int ahb_m2_be, int enable)
-{
- unsigned long dma_cfg = __raw_readl(DMAC_CONFIG);
-
- switch (ahb_m1_be) {
- case 0:
- dma_cfg &= ~(1 << 1);
- break;
- case 1:
- dma_cfg |= (1 << 1);
- break;
- default:
- break;
- }
-
- switch (ahb_m2_be) {
- case 0:
- dma_cfg &= ~(1 << 2);
- break;
- case 1:
- dma_cfg |= (1 << 2);
- break;
- default:
- break;
- }
-
- switch (enable) {
- case 0:
- dma_cfg &= ~(1 << 0);
- break;
- case 1:
- dma_cfg |= (1 << 0);
- break;
- default:
- break;
- }
-
- pnx4008_dma_lock();
- __raw_writel(dma_cfg, DMAC_CONFIG);
- pnx4008_dma_unlock();
-
- return 0;
-}
-
-EXPORT_SYMBOL_GPL(pnx4008_config_dma);
-
-int pnx4008_dma_pack_control(const struct pnx4008_dma_ch_ctrl * ch_ctrl,
- unsigned long *ctrl)
-{
- int i = 0, dbsize, sbsize, err = 0;
-
- if (!ctrl || !ch_ctrl) {
- err = -EINVAL;
- goto out;
- }
-
- *ctrl = 0;
-
- switch (ch_ctrl->tc_mask) {
- case 0:
- break;
- case 1:
- *ctrl |= (1 << 31);
- break;
-
- default:
- err = -EINVAL;
- goto out;
- }
-
- switch (ch_ctrl->cacheable) {
- case 0:
- break;
- case 1:
- *ctrl |= (1 << 30);
- break;
-
- default:
- err = -EINVAL;
- goto out;
- }
- switch (ch_ctrl->bufferable) {
- case 0:
- break;
- case 1:
- *ctrl |= (1 << 29);
- break;
-
- default:
- err = -EINVAL;
- goto out;
- }
- switch (ch_ctrl->priv_mode) {
- case 0:
- break;
- case 1:
- *ctrl |= (1 << 28);
- break;
-
- default:
- err = -EINVAL;
- goto out;
- }
- switch (ch_ctrl->di) {
- case 0:
- break;
- case 1:
- *ctrl |= (1 << 27);
- break;
-
- default:
- err = -EINVAL;
- goto out;
- }
- switch (ch_ctrl->si) {
- case 0:
- break;
- case 1:
- *ctrl |= (1 << 26);
- break;
-
- default:
- err = -EINVAL;
- goto out;
- }
- switch (ch_ctrl->dest_ahb1) {
- case 0:
- break;
- case 1:
- *ctrl |= (1 << 25);
- break;
-
- default:
- err = -EINVAL;
- goto out;
- }
- switch (ch_ctrl->src_ahb1) {
- case 0:
- break;
- case 1:
- *ctrl |= (1 << 24);
- break;
-
- default:
- err = -EINVAL;
- goto out;
- }
- switch (ch_ctrl->dwidth) {
- case WIDTH_BYTE:
- *ctrl &= ~(7 << 21);
- break;
- case WIDTH_HWORD:
- *ctrl &= ~(7 << 21);
- *ctrl |= (1 << 21);
- break;
- case WIDTH_WORD:
- *ctrl &= ~(7 << 21);
- *ctrl |= (2 << 21);
- break;
-
- default:
- err = -EINVAL;
- goto out;
- }
- switch (ch_ctrl->swidth) {
- case WIDTH_BYTE:
- *ctrl &= ~(7 << 18);
- break;
- case WIDTH_HWORD:
- *ctrl &= ~(7 << 18);
- *ctrl |= (1 << 18);
- break;
- case WIDTH_WORD:
- *ctrl &= ~(7 << 18);
- *ctrl |= (2 << 18);
- break;
-
- default:
- err = -EINVAL;
- goto out;
- }
- dbsize = ch_ctrl->dbsize;
- while (!(dbsize & 1)) {
- i++;
- dbsize >>= 1;
- }
- if (ch_ctrl->dbsize != 1 || i > 8 || i == 1) {
- err = -EINVAL;
- goto out;
- } else if (i > 1)
- i--;
- *ctrl &= ~(7 << 15);
- *ctrl |= (i << 15);
-
- sbsize = ch_ctrl->sbsize;
- while (!(sbsize & 1)) {
- i++;
- sbsize >>= 1;
- }
- if (ch_ctrl->sbsize != 1 || i > 8 || i == 1) {
- err = -EINVAL;
- goto out;
- } else if (i > 1)
- i--;
- *ctrl &= ~(7 << 12);
- *ctrl |= (i << 12);
-
- if (ch_ctrl->tr_size > 0x7ff) {
- err = -E2BIG;
- goto out;
- }
- *ctrl &= ~0x7ff;
- *ctrl |= ch_ctrl->tr_size & 0x7ff;
-
-out:
- return err;
-}
-
-EXPORT_SYMBOL_GPL(pnx4008_dma_pack_control);
-
-int pnx4008_dma_parse_control(unsigned long ctrl,
- struct pnx4008_dma_ch_ctrl * ch_ctrl)
-{
- int err = 0;
-
- if (!ch_ctrl) {
- err = -EINVAL;
- goto out;
- }
-
- ch_ctrl->tr_size = ctrl & 0x7ff;
- ctrl >>= 12;
-
- ch_ctrl->sbsize = 1 << (ctrl & 7);
- if (ch_ctrl->sbsize > 1)
- ch_ctrl->sbsize <<= 1;
- ctrl >>= 3;
-
- ch_ctrl->dbsize = 1 << (ctrl & 7);
- if (ch_ctrl->dbsize > 1)
- ch_ctrl->dbsize <<= 1;
- ctrl >>= 3;
-
- switch (ctrl & 7) {
- case 0:
- ch_ctrl->swidth = WIDTH_BYTE;
- break;
- case 1:
- ch_ctrl->swidth = WIDTH_HWORD;
- break;
- case 2:
- ch_ctrl->swidth = WIDTH_WORD;
- break;
- default:
- err = -EINVAL;
- goto out;
- }
- ctrl >>= 3;
-
- switch (ctrl & 7) {
- case 0:
- ch_ctrl->dwidth = WIDTH_BYTE;
- break;
- case 1:
- ch_ctrl->dwidth = WIDTH_HWORD;
- break;
- case 2:
- ch_ctrl->dwidth = WIDTH_WORD;
- break;
- default:
- err = -EINVAL;
- goto out;
- }
- ctrl >>= 3;
-
- ch_ctrl->src_ahb1 = ctrl & 1;
- ctrl >>= 1;
-
- ch_ctrl->dest_ahb1 = ctrl & 1;
- ctrl >>= 1;
-
- ch_ctrl->si = ctrl & 1;
- ctrl >>= 1;
-
- ch_ctrl->di = ctrl & 1;
- ctrl >>= 1;
-
- ch_ctrl->priv_mode = ctrl & 1;
- ctrl >>= 1;
-
- ch_ctrl->bufferable = ctrl & 1;
- ctrl >>= 1;
-
- ch_ctrl->cacheable = ctrl & 1;
- ctrl >>= 1;
-
- ch_ctrl->tc_mask = ctrl & 1;
-
-out:
- return err;
-}
-
-EXPORT_SYMBOL_GPL(pnx4008_dma_parse_control);
-
-int pnx4008_dma_pack_config(const struct pnx4008_dma_ch_config * ch_cfg,
- unsigned long *cfg)
-{
- int err = 0;
-
- if (!cfg || !ch_cfg) {
- err = -EINVAL;
- goto out;
- }
-
- *cfg = 0;
-
- switch (ch_cfg->halt) {
- case 0:
- break;
- case 1:
- *cfg |= (1 << 18);
- break;
-
- default:
- err = -EINVAL;
- goto out;
- }
- switch (ch_cfg->active) {
- case 0:
- break;
- case 1:
- *cfg |= (1 << 17);
- break;
-
- default:
- err = -EINVAL;
- goto out;
- }
- switch (ch_cfg->lock) {
- case 0:
- break;
- case 1:
- *cfg |= (1 << 16);
- break;
-
- default:
- err = -EINVAL;
- goto out;
- }
- switch (ch_cfg->itc) {
- case 0:
- break;
- case 1:
- *cfg |= (1 << 15);
- break;
-
- default:
- err = -EINVAL;
- goto out;
- }
- switch (ch_cfg->ie) {
- case 0:
- break;
- case 1:
- *cfg |= (1 << 14);
- break;
-
- default:
- err = -EINVAL;
- goto out;
- }
- switch (ch_cfg->flow_cntrl) {
- case FC_MEM2MEM_DMA:
- *cfg &= ~(7 << 11);
- break;
- case FC_MEM2PER_DMA:
- *cfg &= ~(7 << 11);
- *cfg |= (1 << 11);
- break;
- case FC_PER2MEM_DMA:
- *cfg &= ~(7 << 11);
- *cfg |= (2 << 11);
- break;
- case FC_PER2PER_DMA:
- *cfg &= ~(7 << 11);
- *cfg |= (3 << 11);
- break;
- case FC_PER2PER_DPER:
- *cfg &= ~(7 << 11);
- *cfg |= (4 << 11);
- break;
- case FC_MEM2PER_PER:
- *cfg &= ~(7 << 11);
- *cfg |= (5 << 11);
- break;
- case FC_PER2MEM_PER:
- *cfg &= ~(7 << 11);
- *cfg |= (6 << 11);
- break;
- case FC_PER2PER_SPER:
- *cfg |= (7 << 11);
- break;
-
- default:
- err = -EINVAL;
- goto out;
- }
- *cfg &= ~(0x1f << 6);
- *cfg |= ((ch_cfg->dest_per & 0x1f) << 6);
-
- *cfg &= ~(0x1f << 1);
- *cfg |= ((ch_cfg->src_per & 0x1f) << 1);
-
-out:
- return err;
-}
-
-EXPORT_SYMBOL_GPL(pnx4008_dma_pack_config);
-
-int pnx4008_dma_parse_config(unsigned long cfg,
- struct pnx4008_dma_ch_config * ch_cfg)
-{
- int err = 0;
-
- if (!ch_cfg) {
- err = -EINVAL;
- goto out;
- }
-
- cfg >>= 1;
-
- ch_cfg->src_per = cfg & 0x1f;
- cfg >>= 5;
-
- ch_cfg->dest_per = cfg & 0x1f;
- cfg >>= 5;
-
- switch (cfg & 7) {
- case 0:
- ch_cfg->flow_cntrl = FC_MEM2MEM_DMA;
- break;
- case 1:
- ch_cfg->flow_cntrl = FC_MEM2PER_DMA;
- break;
- case 2:
- ch_cfg->flow_cntrl = FC_PER2MEM_DMA;
- break;
- case 3:
- ch_cfg->flow_cntrl = FC_PER2PER_DMA;
- break;
- case 4:
- ch_cfg->flow_cntrl = FC_PER2PER_DPER;
- break;
- case 5:
- ch_cfg->flow_cntrl = FC_MEM2PER_PER;
- break;
- case 6:
- ch_cfg->flow_cntrl = FC_PER2MEM_PER;
- break;
- case 7:
- ch_cfg->flow_cntrl = FC_PER2PER_SPER;
- }
- cfg >>= 3;
-
- ch_cfg->ie = cfg & 1;
- cfg >>= 1;
-
- ch_cfg->itc = cfg & 1;
- cfg >>= 1;
-
- ch_cfg->lock = cfg & 1;
- cfg >>= 1;
-
- ch_cfg->active = cfg & 1;
- cfg >>= 1;
-
- ch_cfg->halt = cfg & 1;
-
-out:
- return err;
-}
-
-EXPORT_SYMBOL_GPL(pnx4008_dma_parse_config);
-
-void pnx4008_dma_split_head_entry(struct pnx4008_dma_config * config,
- struct pnx4008_dma_ch_ctrl * ctrl)
-{
- int new_len = ctrl->tr_size, num_entries = 0;
- int old_len = new_len;
- int src_width, dest_width, count = 1;
-
- switch (ctrl->swidth) {
- case WIDTH_BYTE:
- src_width = 1;
- break;
- case WIDTH_HWORD:
- src_width = 2;
- break;
- case WIDTH_WORD:
- src_width = 4;
- break;
- default:
- return;
- }
-
- switch (ctrl->dwidth) {
- case WIDTH_BYTE:
- dest_width = 1;
- break;
- case WIDTH_HWORD:
- dest_width = 2;
- break;
- case WIDTH_WORD:
- dest_width = 4;
- break;
- default:
- return;
- }
-
- while (new_len > 0x7FF) {
- num_entries++;
- new_len = (ctrl->tr_size + num_entries) / (num_entries + 1);
- }
- if (num_entries != 0) {
- struct pnx4008_dma_ll *ll = NULL;
- config->ch_ctrl &= ~0x7ff;
- config->ch_ctrl |= new_len;
- if (!config->is_ll) {
- config->is_ll = 1;
- while (num_entries) {
- if (!ll) {
- config->ll =
- pnx4008_alloc_ll_entry(&config->
- ll_dma);
- ll = config->ll;
- } else {
- ll->next =
- pnx4008_alloc_ll_entry(&ll->
- next_dma);
- ll = ll->next;
- }
-
- if (ctrl->si)
- ll->src_addr =
- config->src_addr +
- src_width * new_len * count;
- else
- ll->src_addr = config->src_addr;
- if (ctrl->di)
- ll->dest_addr =
- config->dest_addr +
- dest_width * new_len * count;
- else
- ll->dest_addr = config->dest_addr;
- ll->ch_ctrl = config->ch_ctrl & 0x7fffffff;
- ll->next_dma = 0;
- ll->next = NULL;
- num_entries--;
- count++;
- }
- } else {
- struct pnx4008_dma_ll *ll_old = config->ll;
- unsigned long ll_dma_old = config->ll_dma;
- while (num_entries) {
- if (!ll) {
- config->ll =
- pnx4008_alloc_ll_entry(&config->
- ll_dma);
- ll = config->ll;
- } else {
- ll->next =
- pnx4008_alloc_ll_entry(&ll->
- next_dma);
- ll = ll->next;
- }
-
- if (ctrl->si)
- ll->src_addr =
- config->src_addr +
- src_width * new_len * count;
- else
- ll->src_addr = config->src_addr;
- if (ctrl->di)
- ll->dest_addr =
- config->dest_addr +
- dest_width * new_len * count;
- else
- ll->dest_addr = config->dest_addr;
- ll->ch_ctrl = config->ch_ctrl & 0x7fffffff;
- ll->next_dma = 0;
- ll->next = NULL;
- num_entries--;
- count++;
- }
- ll->next_dma = ll_dma_old;
- ll->next = ll_old;
- }
- /* adjust last length/tc */
- ll->ch_ctrl = config->ch_ctrl & (~0x7ff);
- ll->ch_ctrl |= old_len - new_len * (count - 1);
- config->ch_ctrl &= 0x7fffffff;
- }
-}
-
-EXPORT_SYMBOL_GPL(pnx4008_dma_split_head_entry);
-
-void pnx4008_dma_split_ll_entry(struct pnx4008_dma_ll * cur_ll,
- struct pnx4008_dma_ch_ctrl * ctrl)
-{
- int new_len = ctrl->tr_size, num_entries = 0;
- int old_len = new_len;
- int src_width, dest_width, count = 1;
-
- switch (ctrl->swidth) {
- case WIDTH_BYTE:
- src_width = 1;
- break;
- case WIDTH_HWORD:
- src_width = 2;
- break;
- case WIDTH_WORD:
- src_width = 4;
- break;
- default:
- return;
- }
-
- switch (ctrl->dwidth) {
- case WIDTH_BYTE:
- dest_width = 1;
- break;
- case WIDTH_HWORD:
- dest_width = 2;
- break;
- case WIDTH_WORD:
- dest_width = 4;
- break;
- default:
- return;
- }
-
- while (new_len > 0x7FF) {
- num_entries++;
- new_len = (ctrl->tr_size + num_entries) / (num_entries + 1);
- }
- if (num_entries != 0) {
- struct pnx4008_dma_ll *ll = NULL;
- cur_ll->ch_ctrl &= ~0x7ff;
- cur_ll->ch_ctrl |= new_len;
- if (!cur_ll->next) {
- while (num_entries) {
- if (!ll) {
- cur_ll->next =
- pnx4008_alloc_ll_entry(&cur_ll->
- next_dma);
- ll = cur_ll->next;
- } else {
- ll->next =
- pnx4008_alloc_ll_entry(&ll->
- next_dma);
- ll = ll->next;
- }
-
- if (ctrl->si)
- ll->src_addr =
- cur_ll->src_addr +
- src_width * new_len * count;
- else
- ll->src_addr = cur_ll->src_addr;
- if (ctrl->di)
- ll->dest_addr =
- cur_ll->dest_addr +
- dest_width * new_len * count;
- else
- ll->dest_addr = cur_ll->dest_addr;
- ll->ch_ctrl = cur_ll->ch_ctrl & 0x7fffffff;
- ll->next_dma = 0;
- ll->next = NULL;
- num_entries--;
- count++;
- }
- } else {
- struct pnx4008_dma_ll *ll_old = cur_ll->next;
- unsigned long ll_dma_old = cur_ll->next_dma;
- while (num_entries) {
- if (!ll) {
- cur_ll->next =
- pnx4008_alloc_ll_entry(&cur_ll->
- next_dma);
- ll = cur_ll->next;
- } else {
- ll->next =
- pnx4008_alloc_ll_entry(&ll->
- next_dma);
- ll = ll->next;
- }
-
- if (ctrl->si)
- ll->src_addr =
- cur_ll->src_addr +
- src_width * new_len * count;
- else
- ll->src_addr = cur_ll->src_addr;
- if (ctrl->di)
- ll->dest_addr =
- cur_ll->dest_addr +
- dest_width * new_len * count;
- else
- ll->dest_addr = cur_ll->dest_addr;
- ll->ch_ctrl = cur_ll->ch_ctrl & 0x7fffffff;
- ll->next_dma = 0;
- ll->next = NULL;
- num_entries--;
- count++;
- }
-
- ll->next_dma = ll_dma_old;
- ll->next = ll_old;
- }
- /* adjust last length/tc */
- ll->ch_ctrl = cur_ll->ch_ctrl & (~0x7ff);
- ll->ch_ctrl |= old_len - new_len * (count - 1);
- cur_ll->ch_ctrl &= 0x7fffffff;
- }
-}
-
-EXPORT_SYMBOL_GPL(pnx4008_dma_split_ll_entry);
-
-int pnx4008_config_channel(int ch, struct pnx4008_dma_config * config)
-{
- if (!VALID_CHANNEL(ch) || !dma_channels[ch].name)
- return -EINVAL;
-
- pnx4008_dma_lock();
- __raw_writel(config->src_addr, DMAC_Cx_SRC_ADDR(ch));
- __raw_writel(config->dest_addr, DMAC_Cx_DEST_ADDR(ch));
-
- if (config->is_ll)
- __raw_writel(config->ll_dma, DMAC_Cx_LLI(ch));
- else
- __raw_writel(0, DMAC_Cx_LLI(ch));
-
- __raw_writel(config->ch_ctrl, DMAC_Cx_CONTROL(ch));
- __raw_writel(config->ch_cfg, DMAC_Cx_CONFIG(ch));
- pnx4008_dma_unlock();
-
- return 0;
-
-}
-
-EXPORT_SYMBOL_GPL(pnx4008_config_channel);
-
-int pnx4008_channel_get_config(int ch, struct pnx4008_dma_config * config)
-{
- if (!VALID_CHANNEL(ch) || !dma_channels[ch].name || !config)
- return -EINVAL;
-
- pnx4008_dma_lock();
- config->ch_cfg = __raw_readl(DMAC_Cx_CONFIG(ch));
- config->ch_ctrl = __raw_readl(DMAC_Cx_CONTROL(ch));
-
- config->ll_dma = __raw_readl(DMAC_Cx_LLI(ch));
- config->is_ll = config->ll_dma ? 1 : 0;
-
- config->src_addr = __raw_readl(DMAC_Cx_SRC_ADDR(ch));
- config->dest_addr = __raw_readl(DMAC_Cx_DEST_ADDR(ch));
- pnx4008_dma_unlock();
-
- return 0;
-}
-
-EXPORT_SYMBOL_GPL(pnx4008_channel_get_config);
-
-int pnx4008_dma_ch_enable(int ch)
-{
- unsigned long ch_cfg;
-
- if (!VALID_CHANNEL(ch) || !dma_channels[ch].name)
- return -EINVAL;
-
- pnx4008_dma_lock();
- ch_cfg = __raw_readl(DMAC_Cx_CONFIG(ch));
- ch_cfg |= 1;
- __raw_writel(ch_cfg, DMAC_Cx_CONFIG(ch));
- pnx4008_dma_unlock();
-
- return 0;
-}
-
-EXPORT_SYMBOL_GPL(pnx4008_dma_ch_enable);
-
-int pnx4008_dma_ch_disable(int ch)
-{
- unsigned long ch_cfg;
-
- if (!VALID_CHANNEL(ch) || !dma_channels[ch].name)
- return -EINVAL;
-
- pnx4008_dma_lock();
- ch_cfg = __raw_readl(DMAC_Cx_CONFIG(ch));
- ch_cfg &= ~1;
- __raw_writel(ch_cfg, DMAC_Cx_CONFIG(ch));
- pnx4008_dma_unlock();
-
- return 0;
-}
-
-EXPORT_SYMBOL_GPL(pnx4008_dma_ch_disable);
-
-int pnx4008_dma_ch_enabled(int ch)
-{
- unsigned long ch_cfg;
-
- if (!VALID_CHANNEL(ch) || !dma_channels[ch].name)
- return -EINVAL;
-
- pnx4008_dma_lock();
- ch_cfg = __raw_readl(DMAC_Cx_CONFIG(ch));
- pnx4008_dma_unlock();
-
- return ch_cfg & 1;
-}
-
-EXPORT_SYMBOL_GPL(pnx4008_dma_ch_enabled);
-
-static irqreturn_t dma_irq_handler(int irq, void *dev_id)
-{
- int i;
- unsigned long dint = __raw_readl(DMAC_INT_STAT);
- unsigned long tcint = __raw_readl(DMAC_INT_TC_STAT);
- unsigned long eint = __raw_readl(DMAC_INT_ERR_STAT);
- unsigned long i_bit;
-
- for (i = MAX_DMA_CHANNELS - 1; i >= 0; i--) {
- i_bit = 1 << i;
- if (dint & i_bit) {
- struct dma_channel *channel = &dma_channels[i];
-
- if (channel->name && channel->irq_handler) {
- int cause = 0;
-
- if (eint & i_bit)
- cause |= DMA_ERR_INT;
- if (tcint & i_bit)
- cause |= DMA_TC_INT;
- channel->irq_handler(i, cause, channel->data);
- } else {
- /*
- * IRQ for an unregistered DMA channel
- */
- printk(KERN_WARNING
- "spurious IRQ for DMA channel %d\n", i);
- }
- if (tcint & i_bit)
- __raw_writel(i_bit, DMAC_INT_TC_CLEAR);
- if (eint & i_bit)
- __raw_writel(i_bit, DMAC_INT_ERR_CLEAR);
- }
- }
- return IRQ_HANDLED;
-}
-
-static int __init pnx4008_dma_init(void)
-{
- int ret, i;
-
- ret = request_irq(DMA_INT, dma_irq_handler, 0, "DMA", NULL);
- if (ret) {
- printk(KERN_CRIT "Wow! Can't register IRQ for DMA\n");
- goto out;
- }
-
- ll_pool.count = 0x4000 / sizeof(struct pnx4008_dma_ll);
- ll_pool.cur = ll_pool.vaddr =
- dma_alloc_coherent(NULL, ll_pool.count * sizeof(struct pnx4008_dma_ll),
- &ll_pool.dma_addr, GFP_KERNEL);
-
- if (!ll_pool.vaddr) {
- ret = -ENOMEM;
- free_irq(DMA_INT, NULL);
- goto out;
- }
-
- for (i = 0; i < ll_pool.count - 1; i++) {
- void **addr = ll_pool.vaddr + i * sizeof(struct pnx4008_dma_ll);
- *addr = (void *)addr + sizeof(struct pnx4008_dma_ll);
- }
- *(long *)(ll_pool.vaddr +
- (ll_pool.count - 1) * sizeof(struct pnx4008_dma_ll)) =
- (long)ll_pool.vaddr;
-
- __raw_writel(1, DMAC_CONFIG);
-
-out:
- return ret;
-}
-arch_initcall(pnx4008_dma_init);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.