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Diffstat (limited to 'arch/arm/plat-omap/dma.c')
| -rw-r--r-- | arch/arm/plat-omap/dma.c | 1468 |
1 files changed, 1468 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c new file mode 100644 index 000000000..d4012d6c0 --- /dev/null +++ b/arch/arm/plat-omap/dma.c @@ -0,0 +1,1468 @@ +/* + * 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> + +#ifdef CONFIG_ARCH_OMAP1 +#include <mach/soc.h> +#endif + +/* + * 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(*dma_chan), GFP_KERNEL); + if (!dma_chan) + return -ENOMEM; + + if (dma_omap2plus()) { + dma_linked_lch = kcalloc(dma_lch_count, + sizeof(*dma_linked_lch), + 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); + + |