ARM: OMAP: Add DMA support for chaining and 3430
Add DMA support for chaining and 3430.
Also remove old DEBUG_PRINTS as noted by Russell King.
Signed-off-by: Anand Gadiyar <gadiyar@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c
index dcbba07..a46676d 100644
--- a/arch/arm/plat-omap/dma.c
+++ b/arch/arm/plat-omap/dma.c
@@ -6,7 +6,7 @@
* DMA channel linking for 1610 by Samuel Ortiz <samuel.ortiz@nokia.com>
* Graphics DMA and LCD DMA graphics tranformations
* by Imre Deak <imre.deak@nokia.com>
- * OMAP2 support Copyright (C) 2004-2005 Texas Instruments, Inc.
+ * OMAP2/3 support Copyright (C) 2004-2007 Texas Instruments, Inc.
* Merged to support both OMAP1 and OMAP2 by Tony Lindgren <tony@atomide.com>
* Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc.
*
@@ -33,12 +33,14 @@
#include <asm/arch/tc.h>
-#define DEBUG_PRINTS
-#undef DEBUG_PRINTS
-#ifdef DEBUG_PRINTS
-#define debug_printk(x) printk x
-#else
-#define debug_printk(x)
+#undef DEBUG
+
+#ifndef CONFIG_ARCH_OMAP1
+enum { DMA_CH_ALLOC_DONE, DMA_CH_PARAMS_SET_DONE, DMA_CH_STARTED,
+ DMA_CH_QUEUED, DMA_CH_NOTSTARTED, DMA_CH_PAUSED, DMA_CH_LINK_ENABLED
+};
+
+enum { DMA_CHAIN_STARTED, DMA_CHAIN_NOTSTARTED };
#endif
#define OMAP_DMA_ACTIVE 0x01
@@ -57,9 +59,66 @@
const char *dev_name;
void (* callback)(int lch, u16 ch_status, void *data);
void *data;
+
+#ifndef CONFIG_ARCH_OMAP1
+ /* required for Dynamic chaining */
+ int prev_linked_ch;
+ int next_linked_ch;
+ int state;
+ int chain_id;
+
+ int status;
+#endif
long flags;
};
+#ifndef CONFIG_ARCH_OMAP1
+struct dma_link_info {
+ int *linked_dmach_q;
+ int no_of_lchs_linked;
+
+ int q_count;
+ int q_tail;
+ int q_head;
+
+ int chain_state;
+ int chain_mode;
+
+};
+
+static struct dma_link_info dma_linked_lch[OMAP_LOGICAL_DMA_CH_COUNT];
+
+/* Chain handling macros */
+#define OMAP_DMA_CHAIN_QINIT(chain_id) \
+ do { \
+ dma_linked_lch[chain_id].q_head = \
+ dma_linked_lch[chain_id].q_tail = \
+ dma_linked_lch[chain_id].q_count = 0; \
+ } while (0)
+#define OMAP_DMA_CHAIN_QFULL(chain_id) \
+ (dma_linked_lch[chain_id].no_of_lchs_linked == \
+ dma_linked_lch[chain_id].q_count)
+#define OMAP_DMA_CHAIN_QLAST(chain_id) \
+ do { \
+ ((dma_linked_lch[chain_id].no_of_lchs_linked-1) == \
+ dma_linked_lch[chain_id].q_count) \
+ } while (0)
+#define OMAP_DMA_CHAIN_QEMPTY(chain_id) \
+ (0 == dma_linked_lch[chain_id].q_count)
+#define __OMAP_DMA_CHAIN_INCQ(end) \
+ ((end) = ((end)+1) % dma_linked_lch[chain_id].no_of_lchs_linked)
+#define OMAP_DMA_CHAIN_INCQHEAD(chain_id) \
+ do { \
+ __OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_head); \
+ dma_linked_lch[chain_id].q_count--; \
+ } while (0)
+
+#define OMAP_DMA_CHAIN_INCQTAIL(chain_id) \
+ do { \
+ __OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_tail); \
+ dma_linked_lch[chain_id].q_count++; \
+ } while (0)
+#endif
static int dma_chan_count;
static spinlock_t dma_chan_lock;
@@ -73,6 +132,10 @@
INT_1610_DMA_CH14, INT_1610_DMA_CH15, INT_DMA_LCD
};
+static inline void disable_lnk(int lch);
+static void omap_disable_channel_irq(int lch);
+static inline void omap_enable_channel_irq(int lch);
+
#define REVISIT_24XX() printk(KERN_ERR "FIXME: no %s on 24xx\n", \
__FUNCTION__);
@@ -148,7 +211,7 @@
omap_writel(l, reg);
}
- if (cpu_is_omap24xx()) {
+ if (cpu_class_is_omap2()) {
if (priority)
OMAP_DMA_CCR_REG(lch) |= (1 << 6);
else
@@ -173,7 +236,7 @@
OMAP1_DMA_CCR2_REG(lch) |= 1 << 2;
}
- if (cpu_is_omap24xx() && dma_trigger) {
+ if (cpu_class_is_omap2() && dma_trigger) {
u32 val = OMAP_DMA_CCR_REG(lch);
val &= ~(3 << 19);
@@ -213,7 +276,7 @@
BUG_ON(omap_dma_in_1510_mode());
- if (cpu_is_omap24xx()) {
+ if (cpu_class_is_omap2()) {
REVISIT_24XX();
return;
}
@@ -245,7 +308,7 @@
void omap_set_dma_write_mode(int lch, enum omap_dma_write_mode mode)
{
- if (cpu_is_omap24xx()) {
+ if (cpu_class_is_omap2()) {
OMAP_DMA_CSDP_REG(lch) &= ~(0x3 << 16);
OMAP_DMA_CSDP_REG(lch) |= (mode << 16);
}
@@ -269,7 +332,7 @@
OMAP1_DMA_CSSA_L_REG(lch) = src_start;
}
- if (cpu_is_omap24xx())
+ if (cpu_class_is_omap2())
OMAP2_DMA_CSSA_REG(lch) = src_start;
OMAP_DMA_CSEI_REG(lch) = src_ei;
@@ -289,11 +352,14 @@
omap_set_dma_dest_params(lch, params->dst_port,
params->dst_amode, params->dst_start,
params->dst_ei, params->dst_fi);
+ if (params->read_prio || params->write_prio)
+ omap_dma_set_prio_lch(lch, params->read_prio,
+ params->write_prio);
}
void omap_set_dma_src_index(int lch, int eidx, int fidx)
{
- if (cpu_is_omap24xx()) {
+ if (cpu_class_is_omap2()) {
REVISIT_24XX();
return;
}
@@ -317,13 +383,13 @@
case OMAP_DMA_DATA_BURST_DIS:
break;
case OMAP_DMA_DATA_BURST_4:
- if (cpu_is_omap24xx())
+ if (cpu_class_is_omap2())
burst = 0x1;
else
burst = 0x2;
break;
case OMAP_DMA_DATA_BURST_8:
- if (cpu_is_omap24xx()) {
+ if (cpu_class_is_omap2()) {
burst = 0x2;
break;
}
@@ -332,7 +398,7 @@
* fall through
*/
case OMAP_DMA_DATA_BURST_16:
- if (cpu_is_omap24xx()) {
+ if (cpu_class_is_omap2()) {
burst = 0x3;
break;
}
@@ -363,7 +429,7 @@
OMAP1_DMA_CDSA_L_REG(lch) = dest_start;
}
- if (cpu_is_omap24xx())
+ if (cpu_class_is_omap2())
OMAP2_DMA_CDSA_REG(lch) = dest_start;
OMAP_DMA_CDEI_REG(lch) = dst_ei;
@@ -372,7 +438,7 @@
void omap_set_dma_dest_index(int lch, int eidx, int fidx)
{
- if (cpu_is_omap24xx()) {
+ if (cpu_class_is_omap2()) {
REVISIT_24XX();
return;
}
@@ -396,19 +462,19 @@
case OMAP_DMA_DATA_BURST_DIS:
break;
case OMAP_DMA_DATA_BURST_4:
- if (cpu_is_omap24xx())
+ if (cpu_class_is_omap2())
burst = 0x1;
else
burst = 0x2;
break;
case OMAP_DMA_DATA_BURST_8:
- if (cpu_is_omap24xx())
+ if (cpu_class_is_omap2())
burst = 0x2;
else
burst = 0x3;
break;
case OMAP_DMA_DATA_BURST_16:
- if (cpu_is_omap24xx()) {
+ if (cpu_class_is_omap2()) {
burst = 0x3;
break;
}
@@ -430,7 +496,7 @@
/* Clear CSR */
if (cpu_class_is_omap1())
status = OMAP_DMA_CSR_REG(lch);
- else if (cpu_is_omap24xx())
+ else if (cpu_class_is_omap2())
OMAP_DMA_CSR_REG(lch) = OMAP2_DMA_CSR_CLEAR_MASK;
/* Enable some nice interrupts. */
@@ -441,7 +507,7 @@
static void omap_disable_channel_irq(int lch)
{
- if (cpu_is_omap24xx())
+ if (cpu_class_is_omap2())
OMAP_DMA_CICR_REG(lch) = 0;
}
@@ -464,6 +530,12 @@
if (dma_chan[lch].next_lch != -1)
OMAP_DMA_CLNK_CTRL_REG(lch) =
dma_chan[lch].next_lch | (1 << 15);
+
+#ifndef CONFIG_ARCH_OMAP1
+ if (dma_chan[lch].next_linked_ch != -1)
+ OMAP_DMA_CLNK_CTRL_REG(lch) =
+ dma_chan[lch].next_linked_ch | (1 << 15);
+#endif
}
static inline void disable_lnk(int lch)
@@ -475,7 +547,7 @@
OMAP_DMA_CLNK_CTRL_REG(lch) |= 1 << 14;
}
- if (cpu_is_omap24xx()) {
+ if (cpu_class_is_omap2()) {
omap_disable_channel_irq(lch);
/* Clear the ENABLE_LNK bit */
OMAP_DMA_CLNK_CTRL_REG(lch) &= ~(1 << 15);
@@ -488,7 +560,7 @@
{
u32 val;
- if (!cpu_is_omap24xx())
+ if (!cpu_class_is_omap2())
return;
val = omap_readl(OMAP_DMA4_IRQENABLE_L0);
@@ -522,7 +594,7 @@
if (cpu_class_is_omap1())
clear_lch_regs(free_ch);
- if (cpu_is_omap24xx())
+ if (cpu_class_is_omap2())
omap_clear_dma(free_ch);
spin_unlock_irqrestore(&dma_chan_lock, flags);
@@ -530,11 +602,14 @@
chan->dev_name = dev_name;
chan->callback = callback;
chan->data = data;
+#ifndef CONFIG_ARCH_OMAP1
+ chan->chain_id = -1;
+#endif
chan->enabled_irqs = OMAP_DMA_DROP_IRQ | OMAP_DMA_BLOCK_IRQ;
if (cpu_class_is_omap1())
chan->enabled_irqs |= OMAP1_DMA_TOUT_IRQ;
- else if (cpu_is_omap24xx())
+ else if (cpu_class_is_omap2())
chan->enabled_irqs |= OMAP2_DMA_MISALIGNED_ERR_IRQ |
OMAP2_DMA_TRANS_ERR_IRQ;
@@ -551,7 +626,7 @@
OMAP_DMA_CCR_REG(free_ch) = dev_id;
}
- if (cpu_is_omap24xx()) {
+ if (cpu_class_is_omap2()) {
omap2_enable_irq_lch(free_ch);
omap_enable_channel_irq(free_ch);
@@ -588,7 +663,7 @@
OMAP_DMA_CCR_REG(lch) = 0;
}
- if (cpu_is_omap24xx()) {
+ if (cpu_class_is_omap2()) {
u32 val;
/* Disable interrupts */
val = omap_readl(OMAP_DMA4_IRQENABLE_L0);
@@ -608,6 +683,67 @@
}
}
+/**
+ * @brief omap_dma_set_global_params : Set global priority settings for dma
+ *
+ * @param arb_rate
+ * @param max_fifo_depth
+ * @param tparams - Number of thereads to reserve : DMA_THREAD_RESERVE_NORM
+ * DMA_THREAD_RESERVE_ONET
+ * DMA_THREAD_RESERVE_TWOT
+ * DMA_THREAD_RESERVE_THREET
+ */
+void
+omap_dma_set_global_params(int arb_rate, int max_fifo_depth, int tparams)
+{
+ u32 reg;
+
+ if (!cpu_class_is_omap2()) {
+ printk(KERN_ERR "FIXME: no %s on 15xx/16xx\n", __FUNCTION__);
+ return;
+ }
+
+ if (arb_rate == 0)
+ arb_rate = 1;
+
+ reg = (arb_rate & 0xff) << 16;
+ reg |= (0xff & max_fifo_depth);
+
+ omap_writel(reg, OMAP_DMA4_GCR_REG);
+}
+EXPORT_SYMBOL(omap_dma_set_global_params);
+
+/**
+ * @brief omap_dma_set_prio_lch : Set channel wise priority settings
+ *
+ * @param lch
+ * @param read_prio - Read priority
+ * @param write_prio - Write priority
+ * Both of the above can be set with one of the following values :
+ * DMA_CH_PRIO_HIGH/DMA_CH_PRIO_LOW
+ */
+int
+omap_dma_set_prio_lch(int lch, unsigned char read_prio,
+ unsigned char write_prio)
+{
+ u32 w;
+
+ if (unlikely((lch < 0 || lch >= OMAP_LOGICAL_DMA_CH_COUNT))) {
+ printk(KERN_ERR "Invalid channel id\n");
+ return -EINVAL;
+ }
+ w = OMAP_DMA_CCR_REG(lch);
+ w &= ~((1 << 6) | (1 << 26));
+ if (cpu_is_omap2430() || cpu_is_omap34xx())
+ w |= ((read_prio & 0x1) << 6) | ((write_prio & 0x1) << 26);
+ else
+ w |= ((read_prio & 0x1) << 6);
+
+ OMAP_DMA_CCR_REG(lch) = w;
+ return 0;
+}
+EXPORT_SYMBOL(omap_dma_set_prio_lch);
+
/*
* Clears any DMA state so the DMA engine is ready to restart with new buffers
* through omap_start_dma(). Any buffers in flight are discarded.
@@ -626,9 +762,9 @@
status = OMAP_DMA_CSR_REG(lch);
}
- if (cpu_is_omap24xx()) {
+ if (cpu_class_is_omap2()) {
int i;
- u32 lch_base = OMAP24XX_DMA_BASE + lch * 0x60 + 0x80;
+ u32 lch_base = OMAP_DMA4_BASE + lch * 0x60 + 0x80;
for (i = 0; i < 0x44; i += 4)
omap_writel(0, lch_base + i);
}
@@ -662,7 +798,7 @@
cur_lch = next_lch;
} while (next_lch != -1);
- } else if (cpu_is_omap24xx()) {
+ } else if (cpu_class_is_omap2()) {
/* Errata: Need to write lch even if not using chaining */
OMAP_DMA_CLNK_CTRL_REG(lch) = lch;
}
@@ -753,7 +889,7 @@
offset = (dma_addr_t) (OMAP1_DMA_CSSA_L_REG(lch) |
(OMAP1_DMA_CSSA_U_REG(lch) << 16));
- if (cpu_is_omap24xx())
+ if (cpu_class_is_omap2())
offset = OMAP_DMA_CSAC_REG(lch);
return offset;
@@ -775,8 +911,8 @@
offset = (dma_addr_t) (OMAP1_DMA_CDSA_L_REG(lch) |
(OMAP1_DMA_CDSA_U_REG(lch) << 16));
- if (cpu_is_omap24xx())
- offset = OMAP2_DMA_CDSA_REG(lch);
+ if (cpu_class_is_omap2())
+ offset = OMAP_DMA_CDAC_REG(lch);
return offset;
}
@@ -859,6 +995,605 @@
dma_chan[lch_head].next_lch = -1;
}
+#ifndef CONFIG_ARCH_OMAP1
+/* Create chain of DMA channesls */
+static void create_dma_lch_chain(int lch_head, int lch_queue)
+{
+ u32 w;
+
+ /* Check if this is the first link in chain */
+ if (dma_chan[lch_head].next_linked_ch == -1) {
+ dma_chan[lch_head].next_linked_ch = lch_queue;
+ dma_chan[lch_head].prev_linked_ch = lch_queue;
+ dma_chan[lch_queue].next_linked_ch = lch_head;
+ dma_chan[lch_queue].prev_linked_ch = lch_head;
+ }
+
+ /* a link exists, link the new channel in circular chain */
+ else {
+ dma_chan[lch_queue].next_linked_ch =
+ dma_chan[lch_head].next_linked_ch;
+ dma_chan[lch_queue].prev_linked_ch = lch_head;
+ dma_chan[lch_head].next_linked_ch = lch_queue;
+ dma_chan[dma_chan[lch_queue].next_linked_ch].prev_linked_ch =
+ lch_queue;
+ }
+
+ w = OMAP_DMA_CLNK_CTRL_REG(lch_head);
+ w &= ~(0x0f);
+ w |= lch_queue;
+ OMAP_DMA_CLNK_CTRL_REG(lch_head) = w;
+
+ w = OMAP_DMA_CLNK_CTRL_REG(lch_queue);
+ w &= ~(0x0f);
+ w |= (dma_chan[lch_queue].next_linked_ch);
+ OMAP_DMA_CLNK_CTRL_REG(lch_queue) = w;
+}
+
+/**
+ * @brief omap_request_dma_chain : Request a chain of DMA channels
+ *
+ * @param dev_id - Device id using the dma channel
+ * @param dev_name - Device name
+ * @param callback - Call back function
+ * @chain_id -
+ * @no_of_chans - Number of channels requested
+ * @chain_mode - Dynamic or static chaining : OMAP_DMA_STATIC_CHAIN
+ * OMAP_DMA_DYNAMIC_CHAIN
+ * @params - Channel parameters
+ *
+ * @return - Succes : 0
+ * Failure: -EINVAL/-ENOMEM
+ */
+int omap_request_dma_chain(int dev_id, const char *dev_name,
+ void (*callback) (int chain_id, u16 ch_status,
+ void *data),
+ int *chain_id, int no_of_chans, int chain_mode,
+ struct omap_dma_channel_params params)
+{
+ int *channels;
+ int i, err;
+
+ /* Is the chain mode valid ? */
+ if (chain_mode != OMAP_DMA_STATIC_CHAIN
+ && chain_mode != OMAP_DMA_DYNAMIC_CHAIN) {
+ printk(KERN_ERR "Invalid chain mode requested\n");
+ return -EINVAL;
+ }
+
+ if (unlikely((no_of_chans < 1
+ || no_of_chans > OMAP_LOGICAL_DMA_CH_COUNT))) {
+ printk(KERN_ERR "Invalid Number of channels requested\n");
+ return -EINVAL;
+ }
+
+ /* Allocate a queue to maintain the status of the channels
+ * in the chain */
+ channels = kmalloc(sizeof(*channels) * no_of_chans, GFP_KERNEL);
+ if (channels == NULL) {
+ printk(KERN_ERR "omap_dma: No memory for channel queue\n");
+ return -ENOMEM;
+ }
+
+ /* request and reserve DMA channels for the chain */
+ for (i = 0; i < no_of_chans; i++) {
+ err = omap_request_dma(dev_id, dev_name,
+ callback, 0, &channels[i]);
+ if (err < 0) {
+ int j;
+ for (j = 0; j < i; j++)
+ omap_free_dma(channels[j]);
+ kfree(channels);
+ printk(KERN_ERR "omap_dma: Request failed %d\n", err);
+ return err;
+ }
+ dma_chan[channels[i]].next_linked_ch = -1;
+ dma_chan[channels[i]].prev_linked_ch = -1;
+ dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
+
+ /*
+ * Allowing client drivers to set common parameters now,
+ * so that later only relevant (src_start, dest_start
+ * and element count) can be set
+ */
+ omap_set_dma_params(channels[i], ¶ms);
+ }
+
+ *chain_id = channels[0];
+ dma_linked_lch[*chain_id].linked_dmach_q = channels;
+ dma_linked_lch[*chain_id].chain_mode = chain_mode;
+ dma_linked_lch[*chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
+ dma_linked_lch[*chain_id].no_of_lchs_linked = no_of_chans;
+
+ for (i = 0; i < no_of_chans; i++)
+ dma_chan[channels[i]].chain_id = *chain_id;
+
+ /* Reset the Queue pointers */
+ OMAP_DMA_CHAIN_QINIT(*chain_id);
+
+ /* Set up the chain */
+ if (no_of_chans == 1)
+ create_dma_lch_chain(channels[0], channels[0]);
+ else {
+ for (i = 0; i < (no_of_chans - 1); i++)
+ create_dma_lch_chain(channels[i], channels[i + 1]);
+ }
+ return 0;
+}
+EXPORT_SYMBOL(omap_request_dma_chain);
+
+/**
+ * @brief omap_modify_dma_chain_param : Modify the chain's params - Modify the
+ * params after setting it. Dont do this while dma is running!!
+ *
+ * @param chain_id - Chained logical channel id.
+ * @param params
+ *
+ * @return - Success : 0
+ * Failure : -EINVAL
+ */
+int omap_modify_dma_chain_params(int chain_id,
+ struct omap_dma_channel_params params)
+{
+ int *channels;
+ u32 i;
+
+ /* Check for input params */
+ if (unlikely((chain_id < 0
+ || chain_id >= OMAP_LOGICAL_DMA_CH_COUNT))) {
+ printk(KERN_ERR "Invalid chain id\n");
+ return -EINVAL;
+ }
+
+ /* Check if the chain exists */
+ if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
+ printk(KERN_ERR "Chain doesn't exists\n");
+ return -EINVAL;
+ }
+ channels = dma_linked_lch[chain_id].linked_dmach_q;
+
+ for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
+ /*
+ * Allowing client drivers to set common parameters now,
+ * so that later only relevant (src_start, dest_start
+ * and element count) can be set
+ */
+ omap_set_dma_params(channels[i], ¶ms);
+ }
+ return 0;
+}
+EXPORT_SYMBOL(omap_modify_dma_chain_params);
+
+/**
+ * @brief omap_free_dma_chain - Free all the logical channels in a chain.
+ *
+ * @param chain_id
+ *
+ * @return - Success : 0
+ * Failure : -EINVAL
+ */
+int omap_free_dma_chain(int chain_id)
+{
+ int *channels;
+ u32 i;
+
+ /* Check for input params */
+ if (unlikely((chain_id < 0 || chain_id >= OMAP_LOGICAL_DMA_CH_COUNT))) {
+ printk(KERN_ERR "Invalid chain id\n");
+ return -EINVAL;
+ }
+
+ /* Check if the chain exists */
+ if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
+ printk(KERN_ERR "Chain doesn't exists\n");
+ return -EINVAL;
+ }
+
+ channels = dma_linked_lch[chain_id].linked_dmach_q;
+ for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
+ dma_chan[channels[i]].next_linked_ch = -1;
+ dma_chan[channels[i]].prev_linked_ch = -1;
+ dma_chan[channels[i]].chain_id = -1;
+ dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
+ omap_free_dma(channels[i]);
+ }
+
+ kfree(channels);
+
+ dma_linked_lch[chain_id].linked_dmach_q = NULL;
+ dma_linked_lch[chain_id].chain_mode = -1;
+ dma_linked_lch[chain_id].chain_state = -1;
+ return (0);
+}
+EXPORT_SYMBOL(omap_free_dma_chain);
+
+/**
+ * @brief omap_dma_chain_status - Check if the chain is in
+ * active / inactive state.
+ * @param chain_id
+ *
+ * @return - Success : OMAP_DMA_CHAIN_ACTIVE/OMAP_DMA_CHAIN_INACTIVE
+ * Failure : -EINVAL
+ */
+int omap_dma_chain_status(int chain_id)
+{
+ /* Check for input params */
+ if (unlikely((chain_id < 0 || chain_id >= OMAP_LOGICAL_DMA_CH_COUNT))) {
+ printk(KERN_ERR "Invalid chain id\n");
+ return -EINVAL;
+ }
+
+ /* Check if the chain exists */
+ if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
+ printk(KERN_ERR "Chain doesn't exists\n");
+ return -EINVAL;
+ }
+ pr_debug("CHAINID=%d, qcnt=%d\n", chain_id,
+ dma_linked_lch[chain_id].q_count);
+
+ if (OMAP_DMA_CHAIN_QEMPTY(chain_id))
+ return OMAP_DMA_CHAIN_INACTIVE;
+ return OMAP_DMA_CHAIN_ACTIVE;
+}
+EXPORT_SYMBOL(omap_dma_chain_status);
+
+/**
+ * @brief omap_dma_chain_a_transfer - Get a free channel from a chain,
+ * set the params and start the transfer.
+ *
+ * @param chain_id
+ * @param src_start - buffer start address
+ * @param dest_start - Dest address
+ * @param elem_count
+ * @param frame_count
+ * @param callbk_data - channel callback parameter data.
+ *
+ * @return - Success : start_dma status
+ * Failure: -EINVAL/-EBUSY
+ */
+int omap_dma_chain_a_transfer(int chain_id, int src_start, int dest_start,
+ int elem_count, int frame_count, void *callbk_data)
+{
+ int *channels;
+ u32 w, lch;
+ int start_dma = 0;
+
+ /* if buffer size is less than 1 then there is
+ * no use of starting the chain */
+ if (elem_count < 1) {
+ printk(KERN_ERR "Invalid buffer size\n");
+ return -EINVAL;
+ }
+
+ /* Check for input params */
+ if (unlikely((chain_id < 0
+ || chain_id >= OMAP_LOGICAL_DMA_CH_COUNT))) {
+ printk(KERN_ERR "Invalid chain id\n");
+ return -EINVAL;
+ }
+
+ /* Check if the chain exists */
+ if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
+ printk(KERN_ERR "Chain doesn't exist\n");
+ return -EINVAL;
+ }
+
+ /* Check if all the channels in chain are in use */
+ if (OMAP_DMA_CHAIN_QFULL(chain_id))
+ return -EBUSY;
+
+ /* Frame count may be negative in case of indexed transfers */
+ channels = dma_linked_lch[chain_id].linked_dmach_q;
+
+ /* Get a free channel */
+ lch = channels[dma_linked_lch[chain_id].q_tail];
+
+ /* Store the callback data */
+ dma_chan[lch].data = callbk_data;
+
+ /* Increment the q_tail */
+ OMAP_DMA_CHAIN_INCQTAIL(chain_id);
+
+ /* Set the params to the free channel */
+ if (src_start != 0)
+ OMAP2_DMA_CSSA_REG(lch) = src_start;
+ if (dest_start != 0)
+ OMAP2_DMA_CDSA_REG(lch) = dest_start;
+
+ /* Write the buffer size */
+ OMAP_DMA_CEN_REG(lch) = elem_count;
+ OMAP_DMA_CFN_REG(lch) = frame_count;
+
+ /* If the chain is dynamically linked,
+ * then we may have to start the chain if its not active */
+ if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_DYNAMIC_CHAIN) {
+
+ /* In Dynamic chain, if the chain is not started,
+ * queue the channel */
+ if (dma_linked_lch[chain_id].chain_state ==
+ DMA_CHAIN_NOTSTARTED) {
+ /* Enable the link in previous channel */
+ if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
+ DMA_CH_QUEUED)
+ enable_lnk(dma_chan[lch].prev_linked_ch);
+ dma_chan[lch].state = DMA_CH_QUEUED;
+ }
+
+ /* Chain is already started, make sure its active,
+ * if not then start the chain */
+ else {
+ start_dma = 1;
+
+ if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
+ DMA_CH_STARTED) {
+ enable_lnk(dma_chan[lch].prev_linked_ch);
+ dma_chan[lch].state = DMA_CH_QUEUED;
+ start_dma = 0;
+ if (0 == ((1 << 7) & (OMAP_DMA_CCR_REG
+ (dma_chan[lch].prev_linked_ch)))) {
+ disable_lnk(dma_chan[lch].
+ prev_linked_ch);
+ pr_debug("\n prev ch is stopped\n");
+ start_dma = 1;
+ }
+ }
+
+ else if (dma_chan[dma_chan[lch].prev_linked_ch].state
+ == DMA_CH_QUEUED) {
+ enable_lnk(dma_chan[lch].prev_linked_ch);
+ dma_chan[lch].state = DMA_CH_QUEUED;
+ start_dma = 0;
+ }
+ omap_enable_channel_irq(lch);
+
+ w = OMAP_DMA_CCR_REG(lch);
+
+ if ((0 == (w & (1 << 24))))
+ w &= ~(1 << 25);
+ else
+ w |= (1 << 25);
+ if (start_dma == 1) {
+ if (0 == (w & (1 << 7))) {
+ w |= (1 << 7);
+ dma_chan[lch].state = DMA_CH_STARTED;
+ pr_debug("starting %d\n", lch);
+ OMAP_DMA_CCR_REG(lch) = w;
+ } else
+ start_dma = 0;
+ } else {
+ if (0 == (w & (1 << 7)))
+ OMAP_DMA_CCR_REG(lch) = w;
+ }
+ dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
+ }
+ }
+ return start_dma;
+}
+EXPORT_SYMBOL(omap_dma_chain_a_transfer);
+
+/**
+ * @brief omap_start_dma_chain_transfers - Start the chain
+ *
+ * @param chain_id
+ *
+ * @return - Success : 0
+ * Failure : -EINVAL/-EBUSY
+ */
+int omap_start_dma_chain_transfers(int chain_id)
+{
+ int *channels;
+ u32 w, i;
+
+ if (unlikely((chain_id < 0 || chain_id >= OMAP_LOGICAL_DMA_CH_COUNT))) {
+ printk(KERN_ERR "Invalid chain id\n");
+ return -EINVAL;
+ }
+
+ channels = dma_linked_lch[chain_id].linked_dmach_q;
+
+ if (dma_linked_lch[channels[0]].chain_state == DMA_CHAIN_STARTED) {
+ printk(KERN_ERR "Chain is already started\n");
+ return -EBUSY;
+ }
+
+ if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_STATIC_CHAIN) {
+ for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked;
+ i++) {
+ enable_lnk(channels[i]);
+ omap_enable_channel_irq(channels[i]);
+ }
+ } else {
+ omap_enable_channel_irq(channels[0]);
+ }
+
+ w = OMAP_DMA_CCR_REG(channels[0]);
+ w |= (1 << 7);
+ dma_linked_lch[chain_id].chain_state = DMA_CHAIN_STARTED;
+ dma_chan[channels[0]].state = DMA_CH_STARTED;
+
+ if ((0 == (w & (1 << 24))))
+ w &= ~(1 << 25);
+ else
+ w |= (1 << 25);
+ OMAP_DMA_CCR_REG(channels[0]) = w;
+
+ dma_chan[channels[0]].flags |= OMAP_DMA_ACTIVE;
+ return 0;
+}
+EXPORT_SYMBOL(omap_start_dma_chain_transfers);
+
+/**
+ * @brief omap_stop_dma_chain_transfers - Stop the dma transfer of a chain.
+ *
+ * @param chain_id
+ *
+ * @return - Success : 0
+ * Failure : EINVAL
+ */
+int omap_stop_dma_chain_transfers(int chain_id)
+{
+ int *channels;
+ u32 w, i;
+ u32 sys_cf;
+
+ /* Check for input params */
+ if (unlikely((chain_id < 0 || chain_id >= OMAP_LOGICAL_DMA_CH_COUNT))) {
+ printk(KERN_ERR "Invalid chain id\n");
+ return -EINVAL;
+ }
+
+ /* Check if the chain exists */
+ if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
+ printk(KERN_ERR "Chain doesn't exists\n");
+ return -EINVAL;
+ }
+ channels = dma_linked_lch[chain_id].linked_dmach_q;
+
+ /* DMA Errata:
+ * Special programming model needed to disable DMA before end of block
+ */
+ sys_cf = omap_readl(OMAP_DMA4_OCP_SYSCONFIG);
+ w = sys_cf;
+ /* Middle mode reg set no Standby */
+ w &= ~((1 << 12)|(1 << 13));
+ omap_writel(w, OMAP_DMA4_OCP_SYSCONFIG);
+
+ for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
+
+ /* Stop the Channel transmission */
+ w = OMAP_DMA_CCR_REG(channels[i]);
+ w &= ~(1 << 7);
+ OMAP_DMA_CCR_REG(channels[i]) = w;
+
+ /* Disable the link in all the channels */
+ disable_lnk(channels[i]);
+ dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
+
+ }
+ dma_linked_lch[chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
+
+ /* Reset the Queue pointers */
+ OMAP_DMA_CHAIN_QINIT(chain_id);
+
+ /* Errata - put in the old value */
+ omap_writel(sys_cf, OMAP_DMA4_OCP_SYSCONFIG);
+ return 0;
+}
+EXPORT_SYMBOL(omap_stop_dma_chain_transfers);
+
+/* Get the index of the ongoing DMA in chain */
+/**
+ * @brief omap_get_dma_chain_index - Get the element and frame index
+ * of the ongoing DMA in chain
+ *
+ * @param chain_id
+ * @param ei - Element index
+ * @param fi - Frame index
+ *
+ * @return - Success : 0
+ * Failure : -EINVAL
+ */
+int omap_get_dma_chain_index(int chain_id, int *ei, int *fi)
+{
+ int lch;
+ int *channels;
+
+ /* Check for input params */
+ if (unlikely((chain_id < 0 || chain_id >= OMAP_LOGICAL_DMA_CH_COUNT))) {
+ printk(KERN_ERR "Invalid chain id\n");
+ return -EINVAL;
+ }
+
+ /* Check if the chain exists */
+ if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
+ printk(KERN_ERR "Chain doesn't exists\n");
+ return -EINVAL;
+ }
+ if ((!ei) || (!fi))
+ return -EINVAL;
+
+ channels = dma_linked_lch[chain_id].linked_dmach_q;
+
+ /* Get the current channel */
+ lch = channels[dma_linked_lch[chain_id].q_head];
+
+ *ei = OMAP2_DMA_CCEN_REG(lch);
+ *fi = OMAP2_DMA_CCFN_REG(lch);
+
+ return 0;
+}
+EXPORT_SYMBOL(omap_get_dma_chain_index);
+
+/**
+ * @brief omap_get_dma_chain_dst_pos - Get the destination position of the
+ * ongoing DMA in chain
+ *
+ * @param chain_id
+ *
+ * @return - Success : Destination position
+ * Failure : -EINVAL
+ */
+int omap_get_dma_chain_dst_pos(int chain_id)
+{
+ int lch;
+ int *channels;
+
+ /* Check for input params */
+ if (unlikely((chain_id < 0 || chain_id >= OMAP_LOGICAL_DMA_CH_COUNT))) {
+ printk(KERN_ERR "Invalid chain id\n");
+ return -EINVAL;
+ }
+
+ /* Check if the chain exists */
+ if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
+ printk(KERN_ERR "Chain doesn't exists\n");
+ return -EINVAL;
+ }
+
+ channels = dma_linked_lch[chain_id].linked_dmach_q;
+
+ /* Get the current channel */
+ lch = channels[dma_linked_lch[chain_id].q_head];
+
+ return (OMAP_DMA_CDAC_REG(lch));
+}
+EXPORT_SYMBOL(omap_get_dma_chain_dst_pos);
+
+/**
+ * @brief omap_get_dma_chain_src_pos - Get the source position
+ * of the ongoing DMA in chain
+ * @param chain_id
+ *
+ * @return - Success : Destination position
+ * Failure : -EINVAL
+ */
+int omap_get_dma_chain_src_pos(int chain_id)
+{
+ int lch;
+ int *channels;
+
+ /* Check for input params */
+ if (unlikely((chain_id < 0 || chain_id >= OMAP_LOGICAL_DMA_CH_COUNT))) {
+ printk(KERN_ERR "Invalid chain id\n");
+ return -EINVAL;
+ }
+
+ /* Check if the chain exists */
+ if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
+ printk(KERN_ERR "Chain doesn't exists\n");
+ return -EINVAL;
+ }
+
+ channels = dma_linked_lch[chain_id].linked_dmach_q;
+
+ /* Get the current channel */
+ lch = channels[dma_linked_lch[chain_id].q_head];
+
+ return (OMAP_DMA_CSAC_REG(lch));
+}
+EXPORT_SYMBOL(omap_get_dma_chain_src_pos);
+#endif
+
/*----------------------------------------------------------------------------*/
#ifdef CONFIG_ARCH_OMAP1
@@ -919,7 +1654,7 @@
#define omap1_dma_irq_handler NULL
#endif
-#ifdef CONFIG_ARCH_OMAP2
+#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
static int omap2_dma_handle_ch(int ch)
{
@@ -953,8 +1688,33 @@
OMAP_DMA_CSR_REG(ch) = OMAP2_DMA_CSR_CLEAR_MASK;
omap_writel(1 << ch, OMAP_DMA4_IRQSTATUS_L0);
- if (likely(dma_chan[ch].callback != NULL))
- dma_chan[ch].callback(ch, status, dma_chan[ch].data);
+ /* If the ch is not chained then chain_id will be -1 */
+ if (dma_chan[ch].chain_id != -1) {
+ int chain_id = dma_chan[ch].chain_id;
+ dma_chan[ch].state = DMA_CH_NOTSTARTED;
+ if (OMAP_DMA_CLNK_CTRL_REG(ch) & (1 << 15))
+ dma_chan[dma_chan[ch].next_linked_ch].state =
+ DMA_CH_STARTED;
+ if (dma_linked_lch[chain_id].chain_mode ==
+ OMAP_DMA_DYNAMIC_CHAIN)
+ disable_lnk(ch);
+
+ if (!OMAP_DMA_CHAIN_QEMPTY(chain_id))
+ OMAP_DMA_CHAIN_INCQHEAD(chain_id);
+
+ status = OMAP_DMA_CSR_REG(ch);
+ }
+
+ if (likely(dma_chan[ch].callback != NULL)) {
+ if (dma_chan[ch].chain_id != -1)
+ dma_chan[ch].callback(dma_chan[ch].chain_id, status,
+ dma_chan[ch].data);
+ else
+ dma_chan[ch].callback(ch, status, dma_chan[ch].data);
+
+ }
+
+ OMAP_DMA_CSR_REG(ch) = status;
return 0;
}
@@ -1385,7 +2145,7 @@
w &= ~(1 << 8);
omap_writew(w, OMAP1610_DMA_LCD_CTRL);
}
- } else if (cpu_is_omap24xx()) {
+ } else if (cpu_class_is_omap2()) {
u8 revision = omap_readb(OMAP_DMA4_REVISION);
printk(KERN_INFO "OMAP DMA hardware revision %d.%d\n",
revision >> 4, revision & 0xf);
@@ -1428,7 +2188,11 @@
}
}
- if (cpu_is_omap24xx())
+ if (cpu_is_omap2430() || cpu_is_omap34xx())
+ omap_dma_set_global_params(DMA_DEFAULT_ARB_RATE,
+ DMA_DEFAULT_FIFO_DEPTH, 0);
+
+ if (cpu_class_is_omap2())
setup_irq(INT_24XX_SDMA_IRQ0, &omap24xx_dma_irq);
/* FIXME: Update LCD DMA to work on 24xx */
