--- /dev/null
+/*
+ * linux/arch/arm/plat-omap/dma.c
+ *
+ * Copyright (C) 2003 - 2008 Nokia Corporation
+ * Author: Juha Yrjölä <juha.yrjola@nokia.com>
+ * 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>
+ * OMAP2/3 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.
+ *
+ * Copyright (C) 2009 Texas Instruments
+ * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
+ *
+ * Support functions for the OMAP internal DMA channels.
+ *
+ * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
+ * Converted DMA library into DMA platform driver.
+ * - G, Manjunath Kondaiah <manjugk@ti.com>
+ *
+ * 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/sched.h>
+#include <linux/spinlock.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+
+#include <linux/omap-dma.h>
+
+/*
+ * MAX_LOGICAL_DMA_CH_COUNT: the maximum number of logical DMA
+ * channels that an instance of the SDMA IP block can support. Used
+ * to size arrays. (The actual maximum on a particular SoC may be less
+ * than this -- for example, OMAP1 SDMA instances only support 17 logical
+ * DMA channels.)
+ */
+#define MAX_LOGICAL_DMA_CH_COUNT 32
+
+#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
+#define OMAP2_DMA_CSR_CLEAR_MASK 0xffffffff
+
+#define OMAP_FUNC_MUX_ARM_BASE (0xfffe1000 + 0xec)
+
+static struct omap_system_dma_plat_info *p;
+static struct omap_dma_dev_attr *d;
+static void omap_clear_dma(int lch);
+static int omap_dma_set_prio_lch(int lch, unsigned char read_prio,
+ unsigned char write_prio);
+static int enable_1510_mode;
+static u32 errata;
+
+static struct omap_dma_global_context_registers {
+ u32 dma_irqenable_l0;
+ u32 dma_irqenable_l1;
+ u32 dma_ocp_sysconfig;
+ u32 dma_gcr;
+} omap_dma_global_context;
+
+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;
+
+#ifndef CONFIG_ARCH_OMAP1
+
+/* 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_lch_count;
+static int dma_chan_count;
+static int omap_dma_reserve_channels;
+
+static spinlock_t dma_chan_lock;
+static struct omap_dma_lch *dma_chan;
+
+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", \
+ __func__);
+
+#ifdef CONFIG_ARCH_OMAP15XX
+/* Returns 1 if the DMA module is in OMAP1510-compatible mode, 0 otherwise */
+static int omap_dma_in_1510_mode(void)
+{
+ return enable_1510_mode;
+}
+#else
+#define omap_dma_in_1510_mode() 0
+#endif
+
+#ifdef CONFIG_ARCH_OMAP1
+static inline void set_gdma_dev(int req, int dev)
+{
+ u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
+ int shift = ((req - 1) % 5) * 6;
+ u32 l;
+
+ l = omap_readl(reg);
+ l &= ~(0x3f << shift);
+ l |= (dev - 1) << shift;
+ omap_writel(l, reg);
+}
+#else
+#define set_gdma_dev(req, dev) do {} while (0)
+#define omap_readl(reg) 0
+#define omap_writel(val, reg) do {} while (0)
+#endif
+
+#ifdef CONFIG_ARCH_OMAP1
+void omap_set_dma_priority(int lch, int dst_port, int priority)
+{
+ unsigned long reg;
+ u32 l;
+
+ if (dma_omap1()) {
+ switch (dst_port) {
+ case OMAP_DMA_PORT_OCP_T1: /* FFFECC00 */
+ reg = OMAP_TC_OCPT1_PRIOR;
+ break;
+ case OMAP_DMA_PORT_OCP_T2: /* FFFECCD0 */
+ reg = OMAP_TC_OCPT2_PRIOR;
+ break;
+ case OMAP_DMA_PORT_EMIFF: /* FFFECC08 */
+ reg = OMAP_TC_EMIFF_PRIOR;
+ break;
+ case OMAP_DMA_PORT_EMIFS: /* FFFECC04 */
+ reg = OMAP_TC_EMIFS_PRIOR;
+ break;
+ default:
+ BUG();
+ return;
+ }
+ l = omap_readl(reg);
+ l &= ~(0xf << 8);
+ l |= (priority & 0xf) << 8;
+ omap_writel(l, reg);
+ }
+}
+#endif
+
+#ifdef CONFIG_ARCH_OMAP2PLUS
+void omap_set_dma_priority(int lch, int dst_port, int priority)
+{
+ u32 ccr;
+
+ ccr = p->dma_read(CCR, lch);
+ if (priority)
+ ccr |= (1 << 6);
+ else
+ ccr &= ~(1 << 6);
+ p->dma_write(ccr, CCR, lch);
+}
+#endif
+EXPORT_SYMBOL(omap_set_dma_priority);
+
+void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
+ int frame_count, int sync_mode,
+ int dma_trigger, int src_or_dst_synch)
+{
+ u32 l;
+
+ l = p->dma_read(CSDP, lch);
+ l &= ~0x03;
+ l |= data_type;
+ p->dma_write(l, CSDP, lch);
+
+ if (dma_omap1()) {
+ u16 ccr;
+
+ ccr = p->dma_read(CCR, lch);
+ ccr &= ~(1 << 5);
+ if (sync_mode == OMAP_DMA_SYNC_FRAME)
+ ccr |= 1 << 5;
+ p->dma_write(ccr, CCR, lch);
+
+ ccr = p->dma_read(CCR2, lch);
+ ccr &= ~(1 << 2);
+ if (sync_mode == OMAP_DMA_SYNC_BLOCK)
+ ccr |= 1 << 2;
+ p->dma_write(ccr, CCR2, lch);
+ }
+
+ if (dma_omap2plus() && dma_trigger) {
+ u32 val;
+
+ val = p->dma_read(CCR, lch);
+
+ /* DMA_SYNCHRO_CONTROL_UPPER depends on the channel number */
+ val &= ~((1 << 23) | (3 << 19) | 0x1f);
+ val |= (dma_trigger & ~0x1f) << 14;
+ val |= dma_trigger & 0x1f;
+
+ if (sync_mode & OMAP_DMA_SYNC_FRAME)
+ val |= 1 << 5;
+ else
+ val &= ~(1 << 5);
+
+ if (sync_mode & OMAP_DMA_SYNC_BLOCK)
+ val |= 1 << 18;
+ else
+ val &= ~(1 << 18);
+
+ if (src_or_dst_synch == OMAP_DMA_DST_SYNC_PREFETCH) {
+ val &= ~(1 << 24); /* dest synch */
+ val |= (1 << 23); /* Prefetch */
+ } else if (src_or_dst_synch) {
+ val |= 1 << 24; /* source synch */
+ } else {
+ val &= ~(1 << 24); /* dest synch */
+ }
+ p->dma_write(val, CCR, lch);
+ }
+
+ p->dma_write(elem_count, CEN, lch);
+ p->dma_write(frame_count, CFN, lch);
+}
+EXPORT_SYMBOL(omap_set_dma_transfer_params);
+
+void omap_set_dma_write_mode(int lch, enum omap_dma_write_mode mode)
+{
+ if (dma_omap2plus()) {
+ u32 csdp;
+
+ csdp = p->dma_read(CSDP, lch);
+ csdp &= ~(0x3 << 16);
+ csdp |= (mode << 16);
+ p->dma_write(csdp, CSDP, lch);
+ }
+}
+EXPORT_SYMBOL(omap_set_dma_write_mode);
+
+void omap_set_dma_channel_mode(int lch, enum omap_dma_channel_mode mode)
+{
+ if (dma_omap1() && !dma_omap15xx()) {
+ u32 l;
+
+ l = p->dma_read(LCH_CTRL, lch);
+ l &= ~0x7;
+ l |= mode;
+ p->dma_write(l, LCH_CTRL, lch);
+ }
+}
+EXPORT_SYMBOL(omap_set_dma_channel_mode);
+
+/* Note that src_port is only for omap1 */
+void omap_set_dma_src_params(int lch, int src_port, int src_amode,
+ unsigned long src_start,
+ int src_ei, int src_fi)
+{
+ u32 l;
+
+ if (dma_omap1()) {
+ u16 w;
+
+ w = p->dma_read(CSDP, lch);
+ w &= ~(0x1f << 2);
+ w |= src_port << 2;
+ p->dma_write(w, CSDP, lch);
+ }
+
+ l = p->dma_read(CCR, lch);
+ l &= ~(0x03 << 12);
+ l |= src_amode << 12;
+ p->dma_write(l, CCR, lch);
+
+ p->dma_write(src_start, CSSA, lch);
+
+ p->dma_write(src_ei, CSEI, lch);
+ p->dma_write(src_fi, CSFI, lch);
+}
+EXPORT_SYMBOL(omap_set_dma_src_params);
+
+void omap_set_dma_params(int lch, struct omap_dma_channel_params *params)
+{
+ omap_set_dma_transfer_params(lch, params->data_type,
+ params->elem_count, params->frame_count,
+ params->sync_mode, params->trigger,
+ params->src_or_dst_synch);
+ omap_set_dma_src_params(lch, params->src_port,
+ params->src_amode, params->src_start,
+ params->src_ei, params->src_fi);
+
+ 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);
+}
+EXPORT_SYMBOL(omap_set_dma_params);
+
+void omap_set_dma_src_data_pack(int lch, int enable)
+{
+ u32 l;
+
+ l = p->dma_read(CSDP, lch);
+ l &= ~(1 << 6);
+ if (enable)
+ l |= (1 << 6);
+ p->dma_write(l, CSDP, lch);
+}
+EXPORT_SYMBOL(omap_set_dma_src_data_pack);
+
+void omap_set_dma_src_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
+{
+ unsigned int burst = 0;
+ u32 l;
+
+ l = p->dma_read(CSDP, lch);
+ l &= ~(0x03 << 7);
+
+ switch (burst_mode) {
+ case OMAP_DMA_DATA_BURST_DIS:
+ break;
+ case OMAP_DMA_DATA_BURST_4:
+ if (dma_omap2plus())
+ burst = 0x1;
+ else
+ burst = 0x2;
+ break;
+ case OMAP_DMA_DATA_BURST_8:
+ if (dma_omap2plus()) {
+ burst = 0x2;
+ break;
+ }
+ /*
+ * not supported by current hardware on OMAP1
+ * w |= (0x03 << 7);
+ * fall through
+ */
+ case OMAP_DMA_DATA_BURST_16:
+ if (dma_omap2plus()) {
+ burst = 0x3;
+ break;
+ }
+ /*
+ * OMAP1 don't support burst 16
+ * fall through
+ */
+ default:
+ BUG();
+ }
+
+ l |= (burst << 7);
+ p->dma_write(l, CSDP, lch);
+}
+EXPORT_SYMBOL(omap_set_dma_src_burst_mode);
+
+/* Note that dest_port is only for OMAP1 */
+void omap_set_dma_dest_params(int lch, int dest_port, int dest_amode,
+ unsigned long dest_start,
+ int dst_ei, int dst_fi)
+{
+ u32 l;
+
+ if (dma_omap1()) {
+ l = p->dma_read(CSDP, lch);
+ l &= ~(0x1f << 9);
+ l |= dest_port << 9;
+ p->dma_write(l, CSDP, lch);
+ }
+
+ l = p->dma_read(CCR, lch);
+ l &= ~(0x03 << 14);
+ l |= dest_amode << 14;
+ p->dma_write(l, CCR, lch);
+
+ p->dma_write(dest_start, CDSA, lch);
+
+ p->dma_write(dst_ei, CDEI, lch);
+ p->dma_write(dst_fi, CDFI, lch);
+}
+EXPORT_SYMBOL(omap_set_dma_dest_params);
+
+void omap_set_dma_dest_data_pack(int lch, int enable)
+{
+ u32 l;
+
+ l = p->dma_read(CSDP, lch);
+ l &= ~(1 << 13);
+ if (enable)
+ l |= 1 << 13;
+ p->dma_write(l, CSDP, lch);
+}
+EXPORT_SYMBOL(omap_set_dma_dest_data_pack);
+
+void omap_set_dma_dest_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
+{
+ unsigned int burst = 0;
+ u32 l;
+
+ l = p->dma_read(CSDP, lch);
+ l &= ~(0x03 << 14);
+
+ switch (burst_mode) {
+ case OMAP_DMA_DATA_BURST_DIS:
+ break;
+ case OMAP_DMA_DATA_BURST_4:
+ if (dma_omap2plus())
+ burst = 0x1;
+ else
+ burst = 0x2;
+ break;
+ case OMAP_DMA_DATA_BURST_8:
+ if (dma_omap2plus())
+ burst = 0x2;
+ else
+ burst = 0x3;
+ break;
+ case OMAP_DMA_DATA_BURST_16:
+ if (dma_omap2plus()) {
+ burst = 0x3;
+ break;
+ }
+ /*
+ * OMAP1 don't support burst 16
+ * fall through
+ */
+ default:
+ printk(KERN_ERR "Invalid DMA burst mode\n");
+ BUG();
+ return;
+ }
+ l |= (burst << 14);
+ p->dma_write(l, CSDP, lch);
+}
+EXPORT_SYMBOL(omap_set_dma_dest_burst_mode);
+
+static inline void omap_enable_channel_irq(int lch)
+{
+ /* Clear CSR */
+ if (dma_omap1())
+ p->dma_read(CSR, lch);
+ else
+ p->dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR, lch);
+
+ /* Enable some nice interrupts. */
+ p->dma_write(dma_chan[lch].enabled_irqs, CICR, lch);
+}
+
+static inline void omap_disable_channel_irq(int lch)
+{
+ /* disable channel interrupts */
+ p->dma_write(0, CICR, lch);
+ /* Clear CSR */
+ if (dma_omap1())
+ p->dma_read(CSR, lch);
+ else
+ p->dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR, lch);
+}
+
+void omap_enable_dma_irq(int lch, u16 bits)
+{
+ dma_chan[lch].enabled_irqs |= bits;
+}
+EXPORT_SYMBOL(omap_enable_dma_irq);
+
+void omap_disable_dma_irq(int lch, u16 bits)
+{
+ dma_chan[lch].enabled_irqs &= ~bits;
+}
+EXPORT_SYMBOL(omap_disable_dma_irq);
+
+static inline void enable_lnk(int lch)
+{
+ u32 l;
+
+ l = p->dma_read(CLNK_CTRL, lch);
+
+ if (dma_omap1())
+ l &= ~(1 << 14);
+
+ /* Set the ENABLE_LNK bits */
+ if (dma_chan[lch].next_lch != -1)
+ l = dma_chan[lch].next_lch | (1 << 15);
+
+#ifndef CONFIG_ARCH_OMAP1
+ if (dma_omap2plus())
+ if (dma_chan[lch].next_linked_ch != -1)
+ l = dma_chan[lch].next_linked_ch | (1 << 15);
+#endif
+
+ p->dma_write(l, CLNK_CTRL, lch);
+}
+
+static inline void disable_lnk(int lch)
+{
+ u32 l;
+
+ l = p->dma_read(CLNK_CTRL, lch);
+
+ /* Disable interrupts */
+ omap_disable_channel_irq(lch);
+
+ if (dma_omap1()) {
+ /* Set the STOP_LNK bit */
+ l |= 1 << 14;
+ }
+
+ if (dma_omap2plus()) {
+ /* Clear the ENABLE_LNK bit */
+ l &= ~(1 << 15);
+ }
+
+ p->dma_write(l, CLNK_CTRL, lch);
+ dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
+}
+
+static inline void omap2_enable_irq_lch(int lch)
+{
+ u32 val;
+ unsigned long flags;
+
+ if (dma_omap1())
+ return;
+
+ spin_lock_irqsave(&dma_chan_lock, flags);
+ /* clear IRQ STATUS */
+ p->dma_write(1 << lch, IRQSTATUS_L0, lch);
+ /* Enable interrupt */
+ val = p->dma_read(IRQENABLE_L0, lch);
+ val |= 1 << lch;
+ p->dma_write(val, IRQENABLE_L0, lch);
+ spin_unlock_irqrestore(&dma_chan_lock, flags);
+}
+
+static inline void omap2_disable_irq_lch(int lch)
+{
+ u32 val;
+ unsigned long flags;
+
+ if (dma_omap1())
+ return;
+
+ spin_lock_irqsave(&dma_chan_lock, flags);
+ /* Disable interrupt */
+ val = p->dma_read(IRQENABLE_L0, lch);
+ val &= ~(1 << lch);
+ p->dma_write(val, IRQENABLE_L0, lch);
+ /* clear IRQ STATUS */
+ p->dma_write(1 << lch, IRQSTATUS_L0, lch);
+ spin_unlock_irqrestore(&dma_chan_lock, flags);
+}
+
+int omap_request_dma(int dev_id, const char *dev_name,
+ void (*callback)(int lch, u16 ch_status, void *data),
+ void *data, int *dma_ch_out)
+{
+ int ch, free_ch = -1;
+ unsigned long flags;
+ struct omap_dma_lch *chan;
+
+ WARN(strcmp(dev_name, "DMA engine"), "Using deprecated platform DMA API - please update to DMA engine");
+
+ spin_lock_irqsave(&dma_chan_lock, flags);
+ for (ch = 0; ch < dma_chan_count; ch++) {
+ if (free_ch == -1 && dma_chan[ch].dev_id == -1) {
+ free_ch = ch;
+ /* Exit after first free channel found */
+ break;
+ }
+ }
+ if (free_ch == -1) {
+ spin_unlock_irqrestore(&dma_chan_lock, flags);
+ return -EBUSY;
+ }
+ chan = dma_chan + free_ch;
+ chan->dev_id = dev_id;
+
+ if (p->clear_lch_regs)
+ p->clear_lch_regs(free_ch);
+
+ if (dma_omap2plus())
+ omap_clear_dma(free_ch);
+
+ spin_unlock_irqrestore(&dma_chan_lock, flags);
+
+ chan->dev_name = dev_name;
+ chan->callback = callback;
+ chan->data = data;
+ chan->flags = 0;
+
+#ifndef CONFIG_ARCH_OMAP1
+ if (dma_omap2plus()) {
+ chan->chain_id = -1;
+ chan->next_linked_ch = -1;
+ }
+#endif
+
+ chan->enabled_irqs = OMAP_DMA_DROP_IRQ | OMAP_DMA_BLOCK_IRQ;
+
+ if (dma_omap1())
+ chan->enabled_irqs |= OMAP1_DMA_TOUT_IRQ;
+ else if (dma_omap2plus())
+ chan->enabled_irqs |= OMAP2_DMA_MISALIGNED_ERR_IRQ |
+ OMAP2_DMA_TRANS_ERR_IRQ;
+
+ if (dma_omap16xx()) {
+ /* If the sync device is set, configure it dynamically. */
+ if (dev_id != 0) {
+ set_gdma_dev(free_ch + 1, dev_id);
+ dev_id = free_ch + 1;
+ }
+ /*
+ * Disable the 1510 compatibility mode and set the sync device
+ * id.
+ */
+ p->dma_write(dev_id | (1 << 10), CCR, free_ch);
+ } else if (dma_omap1()) {
+ p->dma_write(dev_id, CCR, free_ch);
+ }
+
+ if (dma_omap2plus()) {
+ omap_enable_channel_irq(free_ch);
+ omap2_enable_irq_lch(free_ch);
+ }
+
+ *dma_ch_out = free_ch;
+
+ return 0;
+}
+EXPORT_SYMBOL(omap_request_dma);
+
+void omap_free_dma(int lch)
+{
+ unsigned long flags;
+
+ if (dma_chan[lch].dev_id == -1) {
+ pr_err("omap_dma: trying to free unallocated DMA channel %d\n",
+ lch);
+ return;
+ }
+
+ /* Disable interrupt for logical channel */
+ if (dma_omap2plus())
+ omap2_disable_irq_lch(lch);
+
+ /* Disable all DMA interrupts for the channel. */
+ omap_disable_channel_irq(lch);
+
+ /* Make sure the DMA transfer is stopped. */
+ p->dma_write(0, CCR, lch);
+
+ /* Clear registers */
+ if (dma_omap2plus())
+ omap_clear_dma(lch);
+
+ spin_lock_irqsave(&dma_chan_lock, flags);
+ dma_chan[lch].dev_id = -1;
+ dma_chan[lch].next_lch = -1;
+ dma_chan[lch].callback = NULL;
+ spin_unlock_irqrestore(&dma_chan_lock, flags);
+}
+EXPORT_SYMBOL(omap_free_dma);
+
+/**
+ * @brief omap_dma_set_global_params : Set global priority settings for dma
+ *
+ * @param arb_rate
+ * @param max_fifo_depth
+ * @param tparams - Number of threads 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 (dma_omap1()) {
+ printk(KERN_ERR "FIXME: no %s on 15xx/16xx\n", __func__);
+ return;
+ }
+
+ if (max_fifo_depth == 0)
+ max_fifo_depth = 1;
+ if (arb_rate == 0)
+ arb_rate = 1;
+
+ reg = 0xff & max_fifo_depth;
+ reg |= (0x3 & tparams) << 12;
+ reg |= (arb_rate & 0xff) << 16;
+
+ p->dma_write(reg, GCR, 0);
+}
+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
+ */
+static int
+omap_dma_set_prio_lch(int lch, unsigned char read_prio,
+ unsigned char write_prio)
+{
+ u32 l;
+
+ if (unlikely((lch < 0 || lch >= dma_lch_count))) {
+ printk(KERN_ERR "Invalid channel id\n");
+ return -EINVAL;
+ }
+ l = p->dma_read(CCR, lch);
+ l &= ~((1 << 6) | (1 << 26));
+ if (d->dev_caps & IS_RW_PRIORITY)
+ l |= ((read_prio & 0x1) << 6) | ((write_prio & 0x1) << 26);
+ else
+ l |= ((read_prio & 0x1) << 6);
+
+ p->dma_write(l, CCR, lch);
+
+ return 0;
+}
+
+
+/*
+ * 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.
+ */
+static void omap_clear_dma(int lch)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+ p->clear_dma(lch);
+ local_irq_restore(flags);
+}
+
+void omap_start_dma(int lch)
+{
+ u32 l;
+
+ /*
+ * The CPC/CDAC register needs to be initialized to zero
+ * before starting dma transfer.
+ */
+ if (dma_omap15xx())
+ p->dma_write(0, CPC, lch);
+ else
+ p->dma_write(0, CDAC, lch);
+
+ if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
+ int next_lch, cur_lch;
+ char dma_chan_link_map[MAX_LOGICAL_DMA_CH_COUNT];
+
+ /* Set the link register of the first channel */
+ enable_lnk(lch);
+
+ memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
+ dma_chan_link_map[lch] = 1;
+
+ cur_lch = dma_chan[lch].next_lch;
+ do {
+ next_lch = dma_chan[cur_lch].next_lch;
+
+ /* The loop case: we've been here already */
+ if (dma_chan_link_map[cur_lch])
+ break;
+ /* Mark the current channel */
+ dma_chan_link_map[cur_lch] = 1;
+
+ enable_lnk(cur_lch);
+ omap_enable_channel_irq(cur_lch);
+
+ cur_lch = next_lch;
+ } while (next_lch != -1);
+ } else if (IS_DMA_ERRATA(DMA_ERRATA_PARALLEL_CHANNELS))
+ p->dma_write(lch, CLNK_CTRL, lch);
+
+ omap_enable_channel_irq(lch);
+
+ l = p->dma_read(CCR, lch);
+
+ if (IS_DMA_ERRATA(DMA_ERRATA_IFRAME_BUFFERING))
+ l |= OMAP_DMA_CCR_BUFFERING_DISABLE;
+ l |= OMAP_DMA_CCR_EN;
+
+ /*
+ * As dma_write() uses IO accessors which are weakly ordered, there
+ * is no guarantee that data in coherent DMA memory will be visible
+ * to the DMA device. Add a memory barrier here to ensure that any
+ * such data is visible prior to enabling DMA.
+ */
+ mb();
+ p->dma_write(l, CCR, lch);
+
+ dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
+}
+EXPORT_SYMBOL(omap_start_dma);
+
+void omap_stop_dma(int lch)
+{
+ u32 l;
+
+ /* Disable all interrupts on the channel */
+ omap_disable_channel_irq(lch);
+
+ l = p->dma_read(CCR, lch);
+ if (IS_DMA_ERRATA(DMA_ERRATA_i541) &&
+ (l & OMAP_DMA_CCR_SEL_SRC_DST_SYNC)) {
+ int i = 0;
+ u32 sys_cf;
+
+ /* Configure No-Standby */
+ l = p->dma_read(OCP_SYSCONFIG, lch);
+ sys_cf = l;
+ l &= ~DMA_SYSCONFIG_MIDLEMODE_MASK;
+ l |= DMA_SYSCONFIG_MIDLEMODE(DMA_IDLEMODE_NO_IDLE);
+ p->dma_write(l , OCP_SYSCONFIG, 0);
+
+ l = p->dma_read(CCR, lch);
+ l &= ~OMAP_DMA_CCR_EN;
+ p->dma_write(l, CCR, lch);
+
+ /* Wait for sDMA FIFO drain */
+ l = p->dma_read(CCR, lch);
+ while (i < 100 && (l & (OMAP_DMA_CCR_RD_ACTIVE |
+ OMAP_DMA_CCR_WR_ACTIVE))) {
+ udelay(5);
+ i++;
+ l = p->dma_read(CCR, lch);
+ }
+ if (i >= 100)
+ pr_err("DMA drain did not complete on lch %d\n", lch);
+ /* Restore OCP_SYSCONFIG */
+ p->dma_write(sys_cf, OCP_SYSCONFIG, lch);
+ } else {
+ l &= ~OMAP_DMA_CCR_EN;
+ p->dma_write(l, CCR, lch);
+ }
+
+ /*
+ * Ensure that data transferred by DMA is visible to any access
+ * after DMA has been disabled. This is important for coherent
+ * DMA regions.
+ */
+ mb();
+
+ if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
+ int next_lch, cur_lch = lch;
+ char dma_chan_link_map[MAX_LOGICAL_DMA_CH_COUNT];
+
+ memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
+ do {
+ /* The loop case: we've been here already */
+ if (dma_chan_link_map[cur_lch])
+ break;
+ /* Mark the current channel */
+ dma_chan_link_map[cur_lch] = 1;
+
+ disable_lnk(cur_lch);
+
+ next_lch = dma_chan[cur_lch].next_lch;
+ cur_lch = next_lch;
+ } while (next_lch != -1);
+ }
+
+ dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
+}
+EXPORT_SYMBOL(omap_stop_dma);
+
+/*
+ * Allows changing the DMA callback function or data. This may be needed if
+ * the driver shares a single DMA channel for multiple dma triggers.
+ */
+int omap_set_dma_callback(int lch,
+ void (*callback)(int lch, u16 ch_status, void *data),
+ void *data)
+{
+ unsigned long flags;
+
+ if (lch < 0)
+ return -ENODEV;
+
+ spin_lock_irqsave(&dma_chan_lock, flags);
+ if (dma_chan[lch].dev_id == -1) {
+ printk(KERN_ERR "DMA callback for not set for free channel\n");
+ spin_unlock_irqrestore(&dma_chan_lock, flags);
+ return -EINVAL;
+ }
+ dma_chan[lch].callback = callback;
+ dma_chan[lch].data = data;
+ spin_unlock_irqrestore(&dma_chan_lock, flags);
+
+ return 0;
+}
+EXPORT_SYMBOL(omap_set_dma_callback);
+
+/*
+ * Returns current physical source address for the given DMA channel.
+ * If the channel is running the caller must disable interrupts prior calling
+ * this function and process the returned value before re-enabling interrupt to
+ * prevent races with the interrupt handler. Note that in continuous mode there
+ * is a chance for CSSA_L register overflow between the two reads resulting
+ * in incorrect return value.
+ */
+dma_addr_t omap_get_dma_src_pos(int lch)
+{
+ dma_addr_t offset = 0;
+
+ if (dma_omap15xx())
+ offset = p->dma_read(CPC, lch);
+ else
+ offset = p->dma_read(CSAC, lch);
+
+ if (IS_DMA_ERRATA(DMA_ERRATA_3_3) && offset == 0)
+ offset = p->dma_read(CSAC, lch);
+
+ if (!dma_omap15xx()) {
+ /*
+ * CDAC == 0 indicates that the DMA transfer on the channel has
+ * not been started (no data has been transferred so far).
+ * Return the programmed source start address in this case.
+ */
+ if (likely(p->dma_read(CDAC, lch)))
+ offset = p->dma_read(CSAC, lch);
+ else
+ offset = p->dma_read(CSSA, lch);
+ }
+
+ if (dma_omap1())
+ offset |= (p->dma_read(CSSA, lch) & 0xFFFF0000);
+
+ return offset;
+}
+EXPORT_SYMBOL(omap_get_dma_src_pos);
+
+/*
+ * Returns current physical destination address for the given DMA channel.
+ * If the channel is running the caller must disable interrupts prior calling
+ * this function and process the returned value before re-enabling interrupt to
+ * prevent races with the interrupt handler. Note that in continuous mode there
+ * is a chance for CDSA_L register overflow between the two reads resulting
+ * in incorrect return value.
+ */
+dma_addr_t omap_get_dma_dst_pos(int lch)
+{
+ dma_addr_t offset = 0;
+
+ if (dma_omap15xx())
+ offset = p->dma_read(CPC, lch);
+ else
+ offset = p->dma_read(CDAC, lch);
+
+ /*
+ * omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
+ * read before the DMA controller finished disabling the channel.
+ */
+ if (!dma_omap15xx() && offset == 0) {
+ offset = p->dma_read(CDAC, lch);
+ /*
+ * CDAC == 0 indicates that the DMA transfer on the channel has
+ * not been started (no data has been transferred so far).
+ * Return the programmed destination start address in this case.
+ */
+ if (unlikely(!offset))
+ offset = p->dma_read(CDSA, lch);
+ }
+
+ if (dma_omap1())
+ offset |= (p->dma_read(CDSA, lch) & 0xFFFF0000);
+
+ return offset;
+}
+EXPORT_SYMBOL(omap_get_dma_dst_pos);
+
+int omap_get_dma_active_status(int lch)
+{
+ return (p->dma_read(CCR, lch) & OMAP_DMA_CCR_EN) != 0;
+}
+EXPORT_SYMBOL(omap_get_dma_active_status);
+
+int omap_dma_running(void)
+{
+ int lch;
+
+ if (dma_omap1())
+ if (omap_lcd_dma_running())
+ return 1;
+
+ for (lch = 0; lch < dma_chan_count; lch++)
+ if (p->dma_read(CCR, lch) & OMAP_DMA_CCR_EN)
+ return 1;
+
+ return 0;
+}
+
+/*
+ * lch_queue DMA will start right after lch_head one is finished.
+ * For this DMA link to start, you still need to start (see omap_start_dma)
+ * the first one. That will fire up the entire queue.
+ */
+void omap_dma_link_lch(int lch_head, int lch_queue)
+{
+ if (omap_dma_in_1510_mode()) {
+ if (lch_head == lch_queue) {
+ p->dma_write(p->dma_read(CCR, lch_head) | (3 << 8),
+ CCR, lch_head);
+ return;
+ }
+ printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
+ BUG();
+ return;
+ }
+
+ if ((dma_chan[lch_head].dev_id == -1) ||
+ (dma_chan[lch_queue].dev_id == -1)) {
+ pr_err("omap_dma: trying to link non requested channels\n");
+ dump_stack();
+ }
+
+ dma_chan[lch_head].next_lch = lch_queue;
+}
+EXPORT_SYMBOL(omap_dma_link_lch);
+
+/*----------------------------------------------------------------------------*/
+
+#ifdef CONFIG_ARCH_OMAP1
+
+static int omap1_dma_handle_ch(int ch)
+{
+ u32 csr;
+
+ if (enable_1510_mode && ch >= 6) {
+ csr = dma_chan[ch].saved_csr;
+ dma_chan[ch].saved_csr = 0;
+ } else
+ csr = p->dma_read(CSR, ch);
+ if (enable_1510_mode && ch <= 2 && (csr >> 7) != 0) {
+ dma_chan[ch + 6].saved_csr = csr >> 7;
+ csr &= 0x7f;
+ }
+ if ((csr & 0x3f) == 0)
+ return 0;
+ if (unlikely(dma_chan[ch].dev_id == -1)) {
+ pr_warn("Spurious interrupt from DMA channel %d (CSR %04x)\n",
+ ch, csr);
+ return 0;
+ }
+ if (unlikely(csr & OMAP1_DMA_TOUT_IRQ))
+ pr_warn("DMA timeout with device %d\n", dma_chan[ch].dev_id);
+ if (unlikely(csr & OMAP_DMA_DROP_IRQ))
+ pr_warn("DMA synchronization event drop occurred with device %d\n",
+ dma_chan[ch].dev_id);
+ if (likely(csr & OMAP_DMA_BLOCK_IRQ))
+ dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
+ if (likely(dma_chan[ch].callback != NULL))
+ dma_chan[ch].callback(ch, csr, dma_chan[ch].data);
+
+ return 1;
+}
+
+static irqreturn_t omap1_dma_irq_handler(int irq, void *dev_id)
+{
+ int ch = ((int) dev_id) - 1;
+ int handled = 0;
+
+ for (;;) {
+ int handled_now = 0;
+
+ handled_now += omap1_dma_handle_ch(ch);
+ if (enable_1510_mode && dma_chan[ch + 6].saved_csr)
+ handled_now += omap1_dma_handle_ch(ch + 6);
+ if (!handled_now)
+ break;
+ handled += handled_now;
+ }
+
+ return handled ? IRQ_HANDLED : IRQ_NONE;
+}
+
+#else
+#define omap1_dma_irq_handler NULL
+#endif
+
+#ifdef CONFIG_ARCH_OMAP2PLUS
+
+static int omap2_dma_handle_ch(int ch)
+{
+ u32 status = p->dma_read(CSR, ch);
+
+ if (!status) {
+ if (printk_ratelimit())
+ pr_warn("Spurious DMA IRQ for lch %d\n", ch);
+ p->dma_write(1 << ch, IRQSTATUS_L0, ch);
+ return 0;
+ }
+ if (unlikely(dma_chan[ch].dev_id == -1)) {
+ if (printk_ratelimit())
+ pr_warn("IRQ %04x for non-allocated DMA channel %d\n",
+ status, ch);
+ return 0;
+ }
+ if (unlikely(status & OMAP_DMA_DROP_IRQ))
+ pr_info("DMA synchronization event drop occurred with device %d\n",
+ dma_chan[ch].dev_id);
+ if (unlikely(status & OMAP2_DMA_TRANS_ERR_IRQ)) {
+ printk(KERN_INFO "DMA transaction error with device %d\n",
+ dma_chan[ch].dev_id);
+ if (IS_DMA_ERRATA(DMA_ERRATA_i378)) {
+ u32 ccr;
+
+ ccr = p->dma_read(CCR, ch);
+ ccr &= ~OMAP_DMA_CCR_EN;
+ p->dma_write(ccr, CCR, ch);
+ dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
+ }
+ }
+ if (unlikely(status & OMAP2_DMA_SECURE_ERR_IRQ))
+ printk(KERN_INFO "DMA secure error with device %d\n",
+ dma_chan[ch].dev_id);
+ if (unlikely(status & OMAP2_DMA_MISALIGNED_ERR_IRQ))
+ printk(KERN_INFO "DMA misaligned error with device %d\n",
+ dma_chan[ch].dev_id);
+
+ p->dma_write(status, CSR, ch);
+ p->dma_write(1 << ch, IRQSTATUS_L0, ch);
+ /* read back the register to flush the write */
+ p->dma_read(IRQSTATUS_L0, ch);
+
+ /* 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 (p->dma_read(CLNK_CTRL, 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 = p->dma_read(CSR, ch);
+ p->dma_write(status, CSR, ch);
+ }
+
+ if (likely(dma_chan[ch].callback != NULL))
+ dma_chan[ch].callback(ch, status, dma_chan[ch].data);
+
+ return 0;
+}
+
+/* STATUS register count is from 1-32 while our is 0-31 */
+static irqreturn_t omap2_dma_irq_handler(int irq, void *dev_id)
+{
+ u32 val, enable_reg;
+ int i;
+
+ val = p->dma_read(IRQSTATUS_L0, 0);
+ if (val == 0) {
+ if (printk_ratelimit())
+ printk(KERN_WARNING "Spurious DMA IRQ\n");
+ return IRQ_HANDLED;
+ }
+ enable_reg = p->dma_read(IRQENABLE_L0, 0);
+ val &= enable_reg; /* Dispatch only relevant interrupts */
+ for (i = 0; i < dma_lch_count && val != 0; i++) {
+ if (val & 1)
+ omap2_dma_handle_ch(i);
+ val >>= 1;
+ }
+
+ return IRQ_HANDLED;
+}
+
+static struct irqaction omap24xx_dma_irq = {
+ .name = "DMA",
+ .handler = omap2_dma_irq_handler,
+};
+
+#else
+static struct irqaction omap24xx_dma_irq;
+#endif
+
+/*----------------------------------------------------------------------------*/
+
+/*
+ * Note that we are currently using only IRQENABLE_L0 and L1.
+ * As the DSP may be using IRQENABLE_L2 and L3, let's not
+ * touch those for now.
+ */
+void omap_dma_global_context_save(void)
+{
+ omap_dma_global_context.dma_irqenable_l0 =
+ p->dma_read(IRQENABLE_L0, 0);
+ omap_dma_global_context.dma_irqenable_l1 =
+ p->dma_read(IRQENABLE_L1, 0);
+ omap_dma_global_context.dma_ocp_sysconfig =
+ p->dma_read(OCP_SYSCONFIG, 0);
+ omap_dma_global_context.dma_gcr = p->dma_read(GCR, 0);
+}
+
+void omap_dma_global_context_restore(void)
+{
+ int ch;
+
+ p->dma_write(omap_dma_global_context.dma_gcr, GCR, 0);
+ p->dma_write(omap_dma_global_context.dma_ocp_sysconfig,
+ OCP_SYSCONFIG, 0);
+ p->dma_write(omap_dma_global_context.dma_irqenable_l0,
+ IRQENABLE_L0, 0);
+ p->dma_write(omap_dma_global_context.dma_irqenable_l1,
+ IRQENABLE_L1, 0);
+
+ if (IS_DMA_ERRATA(DMA_ROMCODE_BUG))
+ p->dma_write(0x3 , IRQSTATUS_L0, 0);
+
+ for (ch = 0; ch < dma_chan_count; ch++)
+ if (dma_chan[ch].dev_id != -1)
+ omap_clear_dma(ch);
+}
+
+struct omap_system_dma_plat_info *omap_get_plat_info(void)
+{
+ return p;
+}
+EXPORT_SYMBOL_GPL(omap_get_plat_info);
+
+static int omap_system_dma_probe(struct platform_device *pdev)
+{
+ int ch, ret = 0;
+ int dma_irq;
+ char irq_name[4];
+ int irq_rel;
+
+ p = pdev->dev.platform_data;
+ if (!p) {
+ dev_err(&pdev->dev,
+ "%s: System DMA initialized without platform data\n",
+ __func__);
+ return -EINVAL;
+ }
+
+ d = p->dma_attr;
+ errata = p->errata;
+
+ if ((d->dev_caps & RESERVE_CHANNEL) && omap_dma_reserve_channels
+ && (omap_dma_reserve_channels < d->lch_count))
+ d->lch_count = omap_dma_reserve_channels;
+
+ dma_lch_count = d->lch_count;
+ dma_chan_count = dma_lch_count;
+ enable_1510_mode = d->dev_caps & ENABLE_1510_MODE;
+
+ dma_chan = devm_kcalloc(&pdev->dev, dma_lch_count,
+ sizeof(struct omap_dma_lch), GFP_KERNEL);
+ if (!dma_chan) {
+ dev_err(&pdev->dev, "%s: kzalloc fail\n", __func__);
+ return -ENOMEM;
+ }
+
+
+ if (dma_omap2plus()) {
+ dma_linked_lch = kzalloc(sizeof(struct dma_link_info) *
+ dma_lch_count, GFP_KERNEL);
+ if (!dma_linked_lch) {
+ ret = -ENOMEM;
+ goto exit_dma_lch_fail;
+ }
+ }
+
+ spin_lock_init(&dma_chan_lock);
+ for (ch = 0; ch < dma_chan_count; ch++) {
+ omap_clear_dma(ch);
+ if (dma_omap2plus())
+ omap2_disable_irq_lch(ch);
+
+ dma_chan[ch].dev_id = -1;
+ dma_chan[ch].next_lch = -1;
+
+ if (ch >= 6 && enable_1510_mode)
+ continue;
+
+ if (dma_omap1()) {
+ /*
+ * request_irq() doesn't like dev_id (ie. ch) being
+ * zero, so we have to kludge around this.
+ */
+ sprintf(&irq_name[0], "%d", ch);
+ dma_irq = platform_get_irq_byname(pdev, irq_name);
+
+ if (dma_irq < 0) {
+ ret = dma_irq;
+ goto exit_dma_irq_fail;
+ }
+
+ /* INT_DMA_LCD is handled in lcd_dma.c */
+ if (dma_irq == INT_DMA_LCD)
+ continue;
+
+ ret = request_irq(dma_irq,
+ omap1_dma_irq_handler, 0, "DMA",
+ (void *) (ch + 1));
+ if (ret != 0)
+ goto exit_dma_irq_fail;
+ }
+ }
+
+ if (d->dev_caps & IS_RW_PRIORITY)
+ omap_dma_set_global_params(DMA_DEFAULT_ARB_RATE,
+ DMA_DEFAULT_FIFO_DEPTH, 0);
+
+ if (dma_omap2plus() && !(d->dev_caps & DMA_ENGINE_HANDLE_IRQ)) {
+ strcpy(irq_name, "0");
+ dma_irq = platform_get_irq_byname(pdev, irq_name);
+ if (dma_irq < 0) {
+ dev_err(&pdev->dev, "failed: request IRQ %d", dma_irq);
+ ret = dma_irq;
+ goto exit_dma_lch_fail;
+ }
+ ret = setup_irq(dma_irq, &omap24xx_dma_irq);
+ if (ret) {
+ dev_err(&pdev->dev, "set_up failed for IRQ %d for DMA (error %d)\n",
+ dma_irq, ret);
+ goto exit_dma_lch_fail;
+ }
+ }
+
+ /* reserve dma channels 0 and 1 in high security devices on 34xx */
+ if (d->dev_caps & HS_CHANNELS_RESERVED) {
+ pr_info("Reserving DMA channels 0 and 1 for HS ROM code\n");
+ dma_chan[0].dev_id = 0;
+ dma_chan[1].dev_id = 1;
+ }
+ p->show_dma_caps();
+ return 0;
+
+exit_dma_irq_fail:
+ dev_err(&pdev->dev, "unable to request IRQ %d for DMA (error %d)\n",
+ dma_irq, ret);
+ for (irq_rel = 0; irq_rel < ch; irq_rel++) {
+ dma_irq = platform_get_irq(pdev, irq_rel);
+ free_irq(dma_irq, (void *)(irq_rel + 1));
+ }
+
+exit_dma_lch_fail:
+ return ret;
+}
+
+static int omap_system_dma_remove(struct platform_device *pdev)
+{
+ int dma_irq;
+
+ if (dma_omap2plus()) {
+ char irq_name[4];
+ strcpy(irq_name, "0");
+ dma_irq = platform_get_irq_byname(pdev, irq_name);
+ if (dma_irq >= 0)
+ remove_irq(dma_irq, &omap24xx_dma_irq);
+ } else {
+ int irq_rel = 0;
+ for ( ; irq_rel < dma_chan_count; irq_rel++) {
+ dma_irq = platform_get_irq(pdev, irq_rel);
+ free_irq(dma_irq, (void *)(irq_rel + 1));
+ }
+ }
+ return 0;
+}
+
+static struct platform_driver omap_system_dma_driver = {
+ .probe = omap_system_dma_probe,
+ .remove = omap_system_dma_remove,
+ .driver = {
+ .name = "omap_dma_system"
+ },
+};
+
+static int __init omap_system_dma_init(void)
+{
+ return platform_driver_register(&omap_system_dma_driver);
+}
+arch_initcall(omap_system_dma_init);
+
+static void __exit omap_system_dma_exit(void)
+{
+ platform_driver_unregister(&omap_system_dma_driver);
+}
+
+MODULE_DESCRIPTION("OMAP SYSTEM DMA DRIVER");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRIVER_NAME);
+MODULE_AUTHOR("Texas Instruments Inc");
+
+/*
+ * Reserve the omap SDMA channels using cmdline bootarg
+ * "omap_dma_reserve_ch=". The valid range is 1 to 32
+ */
+static int __init omap_dma_cmdline_reserve_ch(char *str)
+{
+ if (get_option(&str, &omap_dma_reserve_channels) != 1)
+ omap_dma_reserve_channels = 0;
+ return 1;
+}
+
+__setup("omap_dma_reserve_ch=", omap_dma_cmdline_reserve_ch);
+
+
Code Review / kvmfornfv.git / blobdiff