/* * linux/arch/arm/plat-omap/dma.c * * Copyright (C) 2003 - 2008 Nokia Corporation * Author: Juha Yrjölä * DMA channel linking for 1610 by Samuel Ortiz * Graphics DMA and LCD DMA graphics tranformations * by Imre Deak * OMAP2/3 support Copyright (C) 2004-2007 Texas Instruments, Inc. * Merged to support both OMAP1 and OMAP2 by Tony Lindgren * Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc. * * Copyright (C) 2009 Texas Instruments * Added OMAP4 support - Santosh Shilimkar * * Support functions for the OMAP internal DMA channels. * * 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 #include #include #include #include #include #include #include #include #include #include #include #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 0xffe #define OMAP_FUNC_MUX_ARM_BASE (0xfffe1000 + 0xec) static int enable_1510_mode; static struct omap_dma_global_context_registers { u32 dma_irqenable_l0; u32 dma_ocp_sysconfig; u32 dma_gcr; } omap_dma_global_context; struct omap_dma_lch { int next_lch; int dev_id; u16 saved_csr; u16 enabled_irqs; 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; }; 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 void __iomem *omap_dma_base; static const u8 omap1_dma_irq[OMAP1_LOGICAL_DMA_CH_COUNT] = { INT_DMA_CH0_6, INT_DMA_CH1_7, INT_DMA_CH2_8, INT_DMA_CH3, INT_DMA_CH4, INT_DMA_CH5, INT_1610_DMA_CH6, INT_1610_DMA_CH7, INT_1610_DMA_CH8, INT_1610_DMA_CH9, INT_1610_DMA_CH10, INT_1610_DMA_CH11, INT_1610_DMA_CH12, INT_1610_DMA_CH13, 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", \ __func__); #define dma_read(reg) \ ({ \ u32 __val; \ if (cpu_class_is_omap1()) \ __val = __raw_readw(omap_dma_base + OMAP1_DMA_##reg); \ else \ __val = __raw_readl(omap_dma_base + OMAP_DMA4_##reg); \ __val; \ }) #define dma_write(val, reg) \ ({ \ if (cpu_class_is_omap1()) \ __raw_writew((u16)(val), omap_dma_base + OMAP1_DMA_##reg); \ else \ __raw_writel((val), omap_dma_base + OMAP_DMA4_##reg); \ }) #ifdef CONFIG_ARCH_OMAP15XX /* Returns 1 if the DMA module is in OMAP1510-compatible mode, 0 otherwise */ 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 int get_gdma_dev(int req) { u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4; int shift = ((req - 1) % 5) * 6; return ((omap_readl(reg) >> shift) & 0x3f) + 1; } 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) #endif /* Omap1 only */ static void clear_lch_regs(int lch) { int i; void __iomem *lch_base = omap_dma_base + OMAP1_DMA_CH_BASE(lch); for (i = 0; i < 0x2c; i += 2) __raw_writew(0, lch_base + i); } void omap_set_dma_priority(int lch, int dst_port, int priority) { unsigned long reg; u32 l; if (cpu_class_is_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); } if (cpu_class_is_omap2()) { u32 ccr; ccr = dma_read(CCR(lch)); if (priority) ccr |= (1 << 6); else ccr &= ~(1 << 6); dma_write(ccr, CCR(lch)); } } 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 = dma_read(CSDP(lch)); l &= ~0x03; l |= data_type; dma_write(l, CSDP(lch)); if (cpu_class_is_omap1()) { u16 ccr; ccr = dma_read(CCR(lch)); ccr &= ~(1 << 5); if (sync_mode == OMAP_DMA_SYNC_FRAME) ccr |= 1 << 5; dma_write(ccr, CCR(lch)); ccr = dma_read(CCR2(lch)); ccr &= ~(1 << 2); if (sync_mode == OMAP_DMA_SYNC_BLOCK) ccr |= 1 << 2; dma_write(ccr, CCR2(lch)); } if (cpu_class_is_omap2() && dma_trigger) { u32 val; val = dma_read(CCR(lch)); /* DMA_SYNCHRO_CONTROL_UPPER depends on the channel number */ val &= ~((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) val |= 1 << 24; /* source synch */ else val &= ~(1 << 24); /* dest synch */ dma_write(val, CCR(lch)); } dma_write(elem_count, CEN(lch)); dma_write(frame_count, CFN(lch)); } EXPORT_SYMBOL(omap_set_dma_transfer_params); void omap_set_dma_color_mode(int lch, enum omap_dma_color_mode mode, u32 color) { BUG_ON(omap_dma_in_1510_mode()); if (cpu_class_is_omap1()) { u16 w; w = dma_read(CCR2(lch)); w &= ~0x03; switch (mode) { case OMAP_DMA_CONSTANT_FILL: w |= 0x01; break; case OMAP_DMA_TRANSPARENT_COPY: w |= 0x02; break; case OMAP_DMA_COLOR_DIS: break; default: BUG(); } dma_write(w, CCR2(lch)); w = dma_read(LCH_CTRL(lch)); w &= ~0x0f; /* Default is channel type 2D */ if (mode) { dma_write((u16)color, COLOR_L(lch)); dma_write((u16)(color >> 16), COLOR_U(lch)); w |= 1; /* Channel type G */ } dma_write(w, LCH_CTRL(lch)); } if (cpu_class_is_omap2()) { u32 val; val = dma_read(CCR(lch)); val &= ~((1 << 17) | (1 << 16)); switch (mode) { case OMAP_DMA_CONSTANT_FILL: val |= 1 << 16; break; case OMAP_DMA_TRANSPARENT_COPY: val |= 1 << 17; break; case OMAP_DMA_COLOR_DIS: break; default: BUG(); } dma_write(val, CCR(lch)); color &= 0xffffff; dma_write(color, COLOR(lch)); } } EXPORT_SYMBOL(omap_set_dma_color_mode); void omap_set_dma_write_mode(int lch, enum omap_dma_write_mode mode) { if (cpu_class_is_omap2()) { u32 csdp; csdp = dma_read(CSDP(lch)); csdp &= ~(0x3 << 16); csdp |= (mode << 16); 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 (cpu_class_is_omap1() && !cpu_is_omap15xx()) { u32 l; l = dma_read(LCH_CTRL(lch)); l &= ~0x7; l |= mode; 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 (cpu_class_is_omap1()) { u16 w; w = dma_read(CSDP(lch)); w &= ~(0x1f << 2); w |= src_port << 2; dma_write(w, CSDP(lch)); } l = dma_read(CCR(lch)); l &= ~(0x03 << 12); l |= src_amode << 12; dma_write(l, CCR(lch)); if (cpu_class_is_omap1()) { dma_write(src_start >> 16, CSSA_U(lch)); dma_write((u16)src_start, CSSA_L(lch)); } if (cpu_class_is_omap2()) dma_write(src_start, CSSA(lch)); dma_write(src_ei, CSEI(lch)); 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_index(int lch, int eidx, int fidx) { if (cpu_class_is_omap2()) return; dma_write(eidx, CSEI(lch)); dma_write(fidx, CSFI(lch)); } EXPORT_SYMBOL(omap_set_dma_src_index); void omap_set_dma_src_data_pack(int lch, int enable) { u32 l; l = dma_read(CSDP(lch)); l &= ~(1 << 6); if (enable) l |= (1 << 6); 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 = dma_read(CSDP(lch)); l &= ~(0x03 << 7); switch (burst_mode) { case OMAP_DMA_DATA_BURST_DIS: break; case OMAP_DMA_DATA_BURST_4: if (cpu_class_is_omap2()) burst = 0x1; else burst = 0x2; break; case OMAP_DMA_DATA_BURST_8: if (cpu_class_is_omap2()) { burst = 0x2; break; } /* not supported by current hardware on OMAP1 * w |= (0x03 << 7); * fall through */ case OMAP_DMA_DATA_BURST_16: if (cpu_class_is_omap2()) { burst = 0x3; break; } /* OMAP1 don't support burst 16 * fall through */ default: BUG(); } l |= (burst << 7); 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 (cpu_class_is_omap1()) { l = dma_read(CSDP(lch)); l &= ~(0x1f << 9); l |= dest_port << 9; dma_write(l, CSDP(lch)); } l = dma_read(CCR(lch)); l &= ~(0x03 << 14); l |= dest_amode << 14; dma_write(l, CCR(lch)); if (cpu_class_is_omap1()) { dma_write(dest_start >> 16, CDSA_U(lch)); dma_write(dest_start, CDSA_L(lch)); } if (cpu_class_is_omap2()) dma_write(dest_start, CDSA(lch)); dma_write(dst_ei, CDEI(lch)); dma_write(dst_fi, CDFI(lch)); } EXPORT_SYMBOL(omap_set_dma_dest_params); void omap_set_dma_dest_index(int lch, int eidx, int fidx) { if (cpu_class_is_omap2()) return; dma_write(eidx, CDEI(lch)); dma_write(fidx, CDFI(lch)); } EXPORT_SYMBOL(omap_set_dma_dest_index); void omap_set_dma_dest_data_pack(int lch, int enable) { u32 l; l = dma_read(CSDP(lch)); l &= ~(1 << 13); if (enable) l |= 1 << 13; 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 = dma_read(CSDP(lch)); l &= ~(0x03 << 14); switch (burst_mode) { case OMAP_DMA_DATA_BURST_DIS: break; case OMAP_DMA_DATA_BURST_4: if (cpu_class_is_omap2()) burst = 0x1; else burst = 0x2; break; case OMAP_DMA_DATA_BURST_8: if (cpu_class_is_omap2()) burst = 0x2; else burst = 0x3; break; case OMAP_DMA_DATA_BURST_16: if (cpu_class_is_omap2()) { 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); dma_write(l, CSDP(lch)); } EXPORT_SYMBOL(omap_set_dma_dest_burst_mode); static inline void omap_enable_channel_irq(int lch) { u32 status; /* Clear CSR */ if (cpu_class_is_omap1()) status = dma_read(CSR(lch)); else if (cpu_class_is_omap2()) dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(lch)); /* Enable some nice interrupts. */ dma_write(dma_chan[lch].enabled_irqs, CICR(lch)); } static void omap_disable_channel_irq(int lch) { if (cpu_class_is_omap2()) dma_write(0, CICR(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 = dma_read(CLNK_CTRL(lch)); if (cpu_class_is_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 (cpu_class_is_omap2()) if (dma_chan[lch].next_linked_ch != -1) l = dma_chan[lch].next_linked_ch | (1 << 15); #endif dma_write(l, CLNK_CTRL(lch)); } static inline void disable_lnk(int lch) { u32 l; l = dma_read(CLNK_CTRL(lch)); /* Disable interrupts */ if (cpu_class_is_omap1()) { dma_write(0, CICR(lch)); /* Set the STOP_LNK bit */ l |= 1 << 14; } if (cpu_class_is_omap2()) { omap_disable_channel_irq(lch); /* Clear the ENABLE_LNK bit */ l &= ~(1 << 15); } 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 (!cpu_class_is_omap2()) return; spin_lock_irqsave(&dma_chan_lock, flags); val = dma_read(IRQENABLE_L0); val |= 1 << lch; dma_write(val, IRQENABLE_L0); 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; 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; if (dev_id == 0) 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 (cpu_class_is_omap1()) clear_lch_regs(free_ch); if (cpu_class_is_omap2()) 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 (cpu_class_is_omap2()) { chan->chain_id = -1; chan->next_linked_ch = -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_class_is_omap2()) chan->enabled_irqs |= OMAP2_DMA_MISALIGNED_ERR_IRQ | OMAP2_DMA_TRANS_ERR_IRQ; if (cpu_is_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. */ dma_write(dev_id | (1 << 10), CCR(free_ch)); } else if (cpu_is_omap7xx() || cpu_is_omap15xx()) { dma_write(dev_id, CCR(free_ch)); } if (cpu_class_is_omap2()) { omap2_enable_irq_lch(free_ch); omap_enable_channel_irq(free_ch); /* Clear the CSR register and IRQ status register */ dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(free_ch)); dma_write(1 << free_ch, IRQSTATUS_L0); } *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; } if (cpu_class_is_omap1()) { /* Disable all DMA interrupts for the channel. */ dma_write(0, CICR(lch)); /* Make sure the DMA transfer is stopped. */ dma_write(0, CCR(lch)); } if (cpu_class_is_omap2()) { u32 val; spin_lock_irqsave(&dma_chan_lock, flags); /* Disable interrupts */ val = dma_read(IRQENABLE_L0); val &= ~(1 << lch); dma_write(val, IRQENABLE_L0); spin_unlock_irqrestore(&dma_chan_lock, flags); /* Clear the CSR register and IRQ status register */ dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(lch)); dma_write(1 << lch, IRQSTATUS_L0); /* Disable all DMA interrupts for the channel. */ dma_write(0, CICR(lch)); /* Make sure the DMA transfer is stopped. */ dma_write(0, CCR(lch)); 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 (!cpu_class_is_omap2()) { 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; dma_write(reg, GCR); } 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 l; if (unlikely((lch < 0 || lch >= dma_lch_count))) { printk(KERN_ERR "Invalid channel id\n"); return -EINVAL; } l = dma_read(CCR(lch)); l &= ~((1 << 6) | (1 << 26)); if (cpu_is_omap2430() || cpu_is_omap34xx() || cpu_is_omap44xx()) l |= ((read_prio & 0x1) << 6) | ((write_prio & 0x1) << 26); else l |= ((read_prio & 0x1) << 6); dma_write(l, CCR(lch)); 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. */ void omap_clear_dma(int lch) { unsigned long flags; local_irq_save(flags); if (cpu_class_is_omap1()) { u32 l; l = dma_read(CCR(lch)); l &= ~OMAP_DMA_CCR_EN; dma_write(l, CCR(lch)); /* Clear pending interrupts */ l = dma_read(CSR(lch)); } if (cpu_class_is_omap2()) { int i; void __iomem *lch_base = omap_dma_base + OMAP_DMA4_CH_BASE(lch); for (i = 0; i < 0x44; i += 4) __raw_writel(0, lch_base + i); } local_irq_restore(flags); } EXPORT_SYMBOL(omap_clear_dma); void omap_start_dma(int lch) { u32 l; if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) { int next_lch, cur_lch; char dma_chan_link_map[OMAP_DMA4_LOGICAL_DMA_CH_COUNT]; dma_chan_link_map[lch] = 1; /* Set the link register of the first channel */ enable_lnk(lch); memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map)); 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 (cpu_is_omap242x() || (cpu_is_omap243x() && omap_type() <= OMAP2430_REV_ES1_0)) { /* Errata: Need to write lch even if not using chaining */ dma_write(lch, CLNK_CTRL(lch)); } omap_enable_channel_irq(lch); l = dma_read(CCR(lch)); /* * Errata: On ES2.0 BUFFERING disable must be set. * This will always fail on ES1.0 */ if (cpu_is_omap24xx()) l |= OMAP_DMA_CCR_EN; l |= OMAP_DMA_CCR_EN; 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 */ if (cpu_class_is_omap1()) dma_write(0, CICR(lch)); l = dma_read(CCR(lch)); l &= ~OMAP_DMA_CCR_EN; dma_write(l, CCR(lch)); if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) { int next_lch, cur_lch = lch; char dma_chan_link_map[OMAP_DMA4_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 inbetween the two reads resulting * in incorrect return value. */ dma_addr_t omap_get_dma_src_pos(int lch) { dma_addr_t offset = 0; if (cpu_is_omap15xx()) offset = dma_read(CPC(lch)); else offset = dma_read(CSAC(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 (!cpu_is_omap15xx() && offset == 0) offset = dma_read(CSAC(lch)); if (cpu_class_is_omap1()) offset |= (dma_read(CSSA_U(lch)) << 16); 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 inbetween the two reads resulting * in incorrect return value. */ dma_addr_t omap_get_dma_dst_pos(int lch) { dma_addr_t offset = 0; if (cpu_is_omap15xx()) offset = dma_read(CPC(lch)); else offset = 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 (!cpu_is_omap15xx() && offset == 0) offset = dma_read(CDAC(lch)); if (cpu_class_is_omap1()) offset |= (dma_read(CDSA_U(lch)) << 16); return offset; } EXPORT_SYMBOL(omap_get_dma_dst_pos); int omap_get_dma_active_status(int lch) { return (dma_read(CCR(lch)) & OMAP_DMA_CCR_EN) != 0; } EXPORT_SYMBOL(omap_get_dma_active_status); int omap_dma_running(void) { int lch; if (cpu_class_is_omap1()) if (omap_lcd_dma_running()) return 1; for (lch = 0; lch < dma_chan_count; lch++) if (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) { dma_write(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)) { printk(KERN_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); /* * Once the DMA queue is stopped, we can destroy it. */ void omap_dma_unlink_lch(int lch_head, int lch_queue) { if (omap_dma_in_1510_mode()) { if (lch_head == lch_queue) { dma_write(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].next_lch != lch_queue || dma_chan[lch_head].next_lch == -1) { printk(KERN_ERR "omap_dma: trying to unlink " "non linked channels\n"); dump_stack(); } if ((dma_chan[lch_head].flags & OMAP_DMA_ACTIVE) || (dma_chan[lch_queue].flags & OMAP_DMA_ACTIVE)) { printk(KERN_ERR "omap_dma: You need to stop the DMA channels " "before unlinking\n"); dump_stack(); } dma_chan[lch_head].next_lch = -1; } EXPORT_SYMBOL(omap_dma_unlink_lch); /*----------------------------------------------------------------------------*/ #ifndef CONFIG_ARCH_OMAP1 /* Create chain of DMA channesls */ static void create_dma_lch_chain(int lch_head, int lch_queue) { u32 l; /* 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; } l = dma_read(CLNK_CTRL(lch_head)); l &= ~(0x1f); l |= lch_queue; dma_write(l, CLNK_CTRL(lch_head)); l = dma_read(CLNK_CTRL(lch_queue)); l &= ~(0x1f); l |= (dma_chan[lch_queue].next_linked_ch); dma_write(l, CLNK_CTRL(lch_queue)); } /** * @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 - Success : 0 * Failure: -EINVAL/-ENOMEM */ int omap_request_dma_chain(int dev_id, const char *dev_name, void (*callback) (int lch, 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 > dma_lch_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, NULL, &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]].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 >= dma_lch_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 >= dma_lch_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 >= dma_lch_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 : 0 * 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 l, 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 >= dma_lch_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) dma_write(src_start, CSSA(lch)); if (dest_start != 0) dma_write(dest_start, CDSA(lch)); /* Write the buffer size */ dma_write(elem_count, CEN(lch)); dma_write(frame_count, CFN(lch)); /* * 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) & dma_read( CCR(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); l = dma_read(CCR(lch)); if ((0 == (l & (1 << 24)))) l &= ~(1 << 25); else l |= (1 << 25); if (start_dma == 1) { if (0 == (l & (1 << 7))) { l |= (1 << 7); dma_chan[lch].state = DMA_CH_STARTED; pr_debug("starting %d\n", lch); dma_write(l, CCR(lch)); } else start_dma = 0; } else { if (0 == (l & (1 << 7))) dma_write(l, CCR(lch)); } dma_chan[lch].flags |= OMAP_DMA_ACTIVE; } } return 0; } 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 l, i; if (unlikely((chain_id < 0 || chain_id >= dma_lch_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]); } l = dma_read(CCR(channels[0])); l |= (1 << 7); dma_linked_lch[chain_id].chain_state = DMA_CHAIN_STARTED; dma_chan[channels[0]].state = DMA_CH_STARTED; if ((0 == (l & (1 << 24)))) l &= ~(1 << 25); else l |= (1 << 25); dma_write(l, CCR(channels[0])); 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 l, i; u32 sys_cf; /* Check for input params */ if (unlikely((chain_id < 0 || chain_id >= dma_lch_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 = dma_read(OCP_SYSCONFIG); l = sys_cf; /* Middle mode reg set no Standby */ l &= ~((1 << 12)|(1 << 13)); dma_write(l, OCP_SYSCONFIG); for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) { /* Stop the Channel transmission */ l = dma_read(CCR(channels[i])); l &= ~(1 << 7); dma_write(l, CCR(channels[i])); /* 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 */ dma_write(sys_cf, 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 >= dma_lch_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 = dma_read(CCEN(lch)); *fi = dma_read(CCFN(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 >= dma_lch_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 dma_read(CDAC(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 >= dma_lch_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 dma_read(CSAC(lch)); } EXPORT_SYMBOL(omap_get_dma_chain_src_pos); #endif /* ifndef CONFIG_ARCH_OMAP1 */ /*----------------------------------------------------------------------------*/ #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 = 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)) { printk(KERN_WARNING "Spurious interrupt from DMA channel " "%d (CSR %04x)\n", ch, csr); return 0; } if (unlikely(csr & OMAP1_DMA_TOUT_IRQ)) printk(KERN_WARNING "DMA timeout with device %d\n", dma_chan[ch].dev_id); if (unlikely(csr & OMAP_DMA_DROP_IRQ)) printk(KERN_WARNING "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 = dma_read(CSR(ch)); if (!status) { if (printk_ratelimit()) printk(KERN_WARNING "Spurious DMA IRQ for lch %d\n", ch); dma_write(1 << ch, IRQSTATUS_L0); return 0; } if (unlikely(dma_chan[ch].dev_id == -1)) { if (printk_ratelimit()) printk(KERN_WARNING "IRQ %04x for non-allocated DMA" "channel %d\n", status, ch); return 0; } if (unlikely(status & OMAP_DMA_DROP_IRQ)) printk(KERN_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 (cpu_class_is_omap2()) { /* Errata: sDMA Channel is not disabled * after a transaction error. So we explicitely * disable the channel */ u32 ccr; ccr = dma_read(CCR(ch)); ccr &= ~OMAP_DMA_CCR_EN; 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); dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(ch)); dma_write(1 << ch, IRQSTATUS_L0); /* 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 (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 = dma_read(CSR(ch)); } 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 = dma_read(IRQSTATUS_L0); if (val == 0) { if (printk_ratelimit()) printk(KERN_WARNING "Spurious DMA IRQ\n"); return IRQ_HANDLED; } enable_reg = dma_read(IRQENABLE_L0); 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, .flags = IRQF_DISABLED }; #else static struct irqaction omap24xx_dma_irq; #endif /*----------------------------------------------------------------------------*/ void omap_dma_global_context_save(void) { omap_dma_global_context.dma_irqenable_l0 = dma_read(IRQENABLE_L0); omap_dma_global_context.dma_ocp_sysconfig = dma_read(OCP_SYSCONFIG); omap_dma_global_context.dma_gcr = dma_read(GCR); } void omap_dma_global_context_restore(void) { int ch; dma_write(omap_dma_global_context.dma_gcr, GCR); dma_write(omap_dma_global_context.dma_ocp_sysconfig, OCP_SYSCONFIG); dma_write(omap_dma_global_context.dma_irqenable_l0, IRQENABLE_L0); /* * A bug in ROM code leaves IRQ status for channels 0 and 1 uncleared * after secure sram context save and restore. Hence we need to * manually clear those IRQs to avoid spurious interrupts. This * affects only secure devices. */ if (cpu_is_omap34xx() && (omap_type() != OMAP2_DEVICE_TYPE_GP)) dma_write(0x3 , IRQSTATUS_L0); for (ch = 0; ch < dma_chan_count; ch++) if (dma_chan[ch].dev_id != -1) omap_clear_dma(ch); } /*----------------------------------------------------------------------------*/ static int __init omap_init_dma(void) { unsigned long base; int ch, r; if (cpu_class_is_omap1()) { base = OMAP1_DMA_BASE; dma_lch_count = OMAP1_LOGICAL_DMA_CH_COUNT; } else if (cpu_is_omap24xx()) { base = OMAP24XX_DMA4_BASE; dma_lch_count = OMAP_DMA4_LOGICAL_DMA_CH_COUNT; } else if (cpu_is_omap34xx()) { base = OMAP34XX_DMA4_BASE; dma_lch_count = OMAP_DMA4_LOGICAL_DMA_CH_COUNT; } else if (cpu_is_omap44xx()) { base = OMAP44XX_DMA4_BASE; dma_lch_count = OMAP_DMA4_LOGICAL_DMA_CH_COUNT; } else { pr_err("DMA init failed for unsupported omap\n"); return -ENODEV; } omap_dma_base = ioremap(base, SZ_4K); BUG_ON(!omap_dma_base); if (cpu_class_is_omap2() && omap_dma_reserve_channels && (omap_dma_reserve_channels <= dma_lch_count)) dma_lch_count = omap_dma_reserve_channels; dma_chan = kzalloc(sizeof(struct omap_dma_lch) * dma_lch_count, GFP_KERNEL); if (!dma_chan) { r = -ENOMEM; goto out_unmap; } if (cpu_class_is_omap2()) { dma_linked_lch = kzalloc(sizeof(struct dma_link_info) * dma_lch_count, GFP_KERNEL); if (!dma_linked_lch) { r = -ENOMEM; goto out_free; } } if (cpu_is_omap15xx()) { printk(KERN_INFO "DMA support for OMAP15xx initialized\n"); dma_chan_count = 9; enable_1510_mode = 1; } else if (cpu_is_omap16xx() || cpu_is_omap7xx()) { printk(KERN_INFO "OMAP DMA hardware version %d\n", dma_read(HW_ID)); printk(KERN_INFO "DMA capabilities: %08x:%08x:%04x:%04x:%04x\n", (dma_read(CAPS_0_U) << 16) | dma_read(CAPS_0_L), (dma_read(CAPS_1_U) << 16) | dma_read(CAPS_1_L), dma_read(CAPS_2), dma_read(CAPS_3), dma_read(CAPS_4)); if (!enable_1510_mode) { u16 w; /* Disable OMAP 3.0/3.1 compatibility mode. */ w = dma_read(GSCR); w |= 1 << 3; dma_write(w, GSCR); dma_chan_count = 16; } else dma_chan_count = 9; } else if (cpu_class_is_omap2()) { u8 revision = dma_read(REVISION) & 0xff; printk(KERN_INFO "OMAP DMA hardware revision %d.%d\n", revision >> 4, revision & 0xf); dma_chan_count = dma_lch_count; } else { dma_chan_count = 0; return 0; } spin_lock_init(&dma_chan_lock); for (ch = 0; ch < dma_chan_count; ch++) { omap_clear_dma(ch); dma_chan[ch].dev_id = -1; dma_chan[ch].next_lch = -1; if (ch >= 6 && enable_1510_mode) continue; if (cpu_class_is_omap1()) { /* * request_irq() doesn't like dev_id (ie. ch) being * zero, so we have to kludge around this. */ r = request_irq(omap1_dma_irq[ch], omap1_dma_irq_handler, 0, "DMA", (void *) (ch + 1)); if (r != 0) { int i; printk(KERN_ERR "unable to request IRQ %d " "for DMA (error %d)\n", omap1_dma_irq[ch], r); for (i = 0; i < ch; i++) free_irq(omap1_dma_irq[i], (void *) (i + 1)); goto out_free; } } } if (cpu_is_omap2430() || cpu_is_omap34xx() || cpu_is_omap44xx()) omap_dma_set_global_params(DMA_DEFAULT_ARB_RATE, DMA_DEFAULT_FIFO_DEPTH, 0); if (cpu_class_is_omap2()) { int irq; if (cpu_is_omap44xx()) irq = INT_44XX_SDMA_IRQ0; else irq = INT_24XX_SDMA_IRQ0; setup_irq(irq, &omap24xx_dma_irq); } if (cpu_is_omap34xx() || cpu_is_omap44xx()) { /* Enable smartidle idlemodes and autoidle */ u32 v = dma_read(OCP_SYSCONFIG); v &= ~(DMA_SYSCONFIG_MIDLEMODE_MASK | DMA_SYSCONFIG_SIDLEMODE_MASK | DMA_SYSCONFIG_AUTOIDLE); v |= (DMA_SYSCONFIG_MIDLEMODE(DMA_IDLEMODE_SMARTIDLE) | DMA_SYSCONFIG_SIDLEMODE(DMA_IDLEMODE_SMARTIDLE) | DMA_SYSCONFIG_AUTOIDLE); dma_write(v , OCP_SYSCONFIG); /* reserve dma channels 0 and 1 in high security devices */ if (cpu_is_omap34xx() && (omap_type() != OMAP2_DEVICE_TYPE_GP)) { printk(KERN_INFO "Reserving DMA channels 0 and 1 for " "HS ROM code\n"); dma_chan[0].dev_id = 0; dma_chan[1].dev_id = 1; } } return 0; out_free: kfree(dma_chan); out_unmap: iounmap(omap_dma_base); return r; } arch_initcall(omap_init_dma); /* * 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);