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Date: Tue, 28 Feb 2012 15:27:36 +0800
From: zhaoy <zhaoy@...vell.com>
To: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
nicolas.pitre@...aro.org, linux@....linux.org.uk,
hzhuang1@...vell.com, cxie4@...vell.com, leoy@...vell.com
Cc: zhaoy <zhaoy@...vell.com>
Subject: [PATCH 04/13] dmaengine:mmp add peripheral dma driver
1,add dmac driver for peripheral device
Change-Id: I65bee3b4b9e8c832f3c9ca607bc91f264fb4ed8e
Signed-off-by: zhaoy <zhaoy@...vell.com>
---
arch/arm/plat-pxa/include/plat/dma.h | 33 +-
drivers/dma/pxa_dmac.c | 1077 ++++++++++++++++++++++++++++++++++
2 files changed, 1109 insertions(+), 1 deletions(-)
create mode 100644 drivers/dma/pxa_dmac.c
diff --git a/arch/arm/plat-pxa/include/plat/dma.h b/arch/arm/plat-pxa/include/plat/dma.h
index fb4c393..e30880e 100644
--- a/arch/arm/plat-pxa/include/plat/dma.h
+++ b/arch/arm/plat-pxa/include/plat/dma.h
@@ -1,6 +1,11 @@
#ifndef __PLAT_DMA_H
#define __PLAT_DMA_H
+#if defined(CONFIG_CPU_MMP2) || defined(CONFIG_CPU_MMP3)
+#include <linux/device.h>
+#include <linux/dmaengine.h>
+#endif
+
#define DMAC_REG(x) (*((volatile u32 *)(DMAC_REGS_VIRT + (x))))
#define DCSR(n) DMAC_REG((n) << 2)
@@ -36,6 +41,7 @@
#define DRCMR_CHLNUM 0x1f /* mask for Channel Number (read / write) */
#define DDADR_DESCADDR 0xfffffff0 /* Address of next descriptor (mask) */
+#define DDADR_BREN (2 << 0) /* Enable Descriptor Branch */
#define DDADR_STOP (1 << 0) /* Stop (read / write) */
#define DCMD_INCSRCADDR (1 << 31) /* Source Address Increment Setting. */
@@ -71,13 +77,38 @@ typedef enum {
DMA_PRIO_LOW = 2
} pxa_dma_prio;
+struct pxa_dmac_data {
+ int priority;
+ int flow_ctrl;
+ int ch_map;
+};
+
+#if defined(CONFIG_CPU_MMP2) || defined(CONFIG_CPU_MMP3)
+static inline int pxa_dmac_is_this_type(struct dma_chan *chan)
+{
+ return !strcmp(dev_name(chan->device->dev), "pxa-dmac");
+}
+
/*
* DMA registration
*/
+struct pxa_dmac_platform_data {
+ unsigned int irq_base;
+ unsigned int nr_ch;
+};
+
+
+int __init pxa_init_dma(int second_irq_start, int num_ch);
+unsigned long pxa_dmac_chan_get_src_ptr(struct dma_chan *chan);
+unsigned long pxa_dmac_chan_get_dst_ptr(struct dma_chan *chan);
+pxa_dma_prio pxa_dmac_chan_get_prio(struct dma_chan *chan);
+#else
int __init pxa_init_dma(int irq, int num_ch);
+#endif
+int __init pxa_init_dma_irq(int mux_irq, int second_irq_start, int num_ch);
-int pxa_request_dma (char *name,
+int pxa_request_dma(char *name,
pxa_dma_prio prio,
void (*irq_handler)(int, void *),
void *data);
diff --git a/drivers/dma/pxa_dmac.c b/drivers/dma/pxa_dmac.c
new file mode 100644
index 0000000..16446d4
--- /dev/null
+++ b/drivers/dma/pxa_dmac.c
@@ -0,0 +1,1077 @@
+/*
+ * drivers/dma/pxa-dmac.c
+ *
+ * Driver for Xscale PXA DMAC engine and MMP peripheral DMA
+ *
+ * Copyright 2011 Leo Yan <leoy@...vell.com>
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ */
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/clk.h>
+#include <linux/wait.h>
+#include <linux/sched.h>
+#include <linux/semaphore.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+#include <linux/dmaengine.h>
+#include <linux/delay.h>
+#include <linux/irq.h>
+
+#include <asm/irq.h>
+#include <mach/dma.h>
+#include <plat/dma.h>
+
+#define DMAC_DESC_SIZE 512
+#define DMAC_DESC_NUM (int)(DMAC_DESC_SIZE / \
+ sizeof(struct pxa_dma_desc))
+
+#define DMAC_ALIGNMENT 3
+#define DMAC_MAX_XFER_BYTES ((SZ_8K - 1) & ~((1 << DMAC_ALIGNMENT) - 1))
+#define DMAC_CYCLIC_LOOP (1 << 0)
+
+u32 dma_irq_base;
+
+struct pxa_dmac_chan {
+ struct pxa_dmac_engine *pxa_dmac;
+ struct dma_chan chan;
+ struct dma_async_tx_descriptor desc;
+
+ struct pxa_dma_desc *desc_arr;
+ phys_addr_t desc_arr_phys;
+ enum dma_data_direction dir;
+ dma_addr_t dev_addr;
+ u32 burst_sz;
+ enum dma_slave_buswidth width;
+ u32 dcmd;
+
+ dma_cookie_t last_completed;
+ enum dma_status status;
+ unsigned int flags;
+
+ pxa_dma_prio prio;
+ int irq;
+ int idx;
+ int ch_map;
+};
+
+struct pxa_dmac_engine {
+ struct device *dev;
+ void __iomem *base;
+ struct dma_device dmac_device;
+ unsigned int dmac_nr;
+ struct pxa_dmac_chan dmac[0];
+};
+
+/*
+ * Debug fs
+ */
+#ifdef CONFIG_DEBUG_FS
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+#include <linux/seq_file.h>
+
+#define DMA_DEBUG_NAME "pxa_dmac"
+
+static struct dentry *dbgfs_root, *dbgfs_state, **dbgfs_chan;
+static int num_dma_channels;
+static spinlock_t dbgfs_lock;
+
+static int dbg_show_requester_chan(struct seq_file *s, void *p)
+{
+ int pos = 0;
+ struct pxa_dmac_chan *dmac = (struct pxa_dmac_chan *)s->private;
+ int chan = dmac->idx;
+ int i;
+ u32 drcmr;
+
+ pos += seq_printf(s, "DMA channel %d requesters list :\n", chan);
+ for (i = 0; i < (num_dma_channels << 1); i++) {
+ drcmr = DRCMR(i);
+ if (!(drcmr & DRCMR_MAPVLD))
+ continue;
+ if ((drcmr & DRCMR_CHLNUM) == chan)
+ pos += seq_printf(s, "\tRequester %d (MAPVLD=%d)\n", i,
+ !!(drcmr & DRCMR_MAPVLD));
+ }
+ return pos;
+}
+
+static inline int dbg_burst_from_dcmd(u32 dcmd)
+{
+ int burst = (dcmd >> 16) & 0x3;
+
+ return burst ? 4 << burst : 0;
+}
+
+static int is_phys_valid(unsigned long addr)
+{
+ return pfn_valid(__phys_to_pfn(addr));
+}
+
+#define DCSR_STR(flag) (dcsr & DCSR_##flag ? #flag" " : "")
+#define DCMD_STR(flag) (dcmd & DCMD_##flag ? #flag" " : "")
+
+static int dbg_show_descriptors(struct seq_file *s, void *p)
+{
+ int pos = 0;
+ struct pxa_dmac_chan *dmac = (struct pxa_dmac_chan *)s->private;
+ int chan = dmac->idx;
+ int i, max_show = 20, burst, width;
+ u32 dcsr, dcmd;
+ unsigned long phys_desc;
+ struct pxa_dma_desc *desc;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dbgfs_lock, flags);
+
+ dcsr = DCSR(chan);
+ phys_desc = DDADR(chan);
+ phys_desc &= ~(DDADR_BREN | DDADR_STOP);
+
+ if ((dcsr & DCSR_NODESC) || !phys_desc) {
+ pos += seq_printf(s, "Config to No-Descriptor Fetch\n");
+ goto out;
+ }
+
+ pos += seq_printf(s, "DMA channel %d descriptors :\n", chan);
+ pos += seq_printf(s, "[%03d] First descriptor unknown\n", 0);
+ for (i = 1; i < max_show && is_phys_valid(phys_desc); i++) {
+
+ /* means the last one */
+ if (!phys_desc)
+ break;
+
+ desc = phys_to_virt(phys_desc);
+ dcmd = desc->dcmd;
+ burst = dbg_burst_from_dcmd(dcmd);
+ width = (1 << ((dcmd >> 14) & 0x3)) >> 1;
+
+ pos += seq_printf(s, "[%03d] Desc at %08lx(virt %p)\n",
+ i, phys_desc, desc);
+ pos += seq_printf(s, "\tDDADR = %08x\n", desc->ddadr);
+ pos += seq_printf(s, "\tDSADR = %08x\n", desc->dsadr);
+ pos += seq_printf(s, "\tDTADR = %08x\n", desc->dtadr);
+ pos += seq_printf(s, "\tDCMD = %08x (%s%s%s%s%s%s%sburst=%d"
+ " width=%d len=%d)\n",
+ dcmd,
+ DCMD_STR(INCSRCADDR), DCMD_STR(INCTRGADDR),
+ DCMD_STR(FLOWSRC), DCMD_STR(FLOWTRG),
+ DCMD_STR(STARTIRQEN), DCMD_STR(ENDIRQEN),
+ DCMD_STR(ENDIAN), burst, width,
+ dcmd & DCMD_LENGTH);
+
+ if (phys_desc & DDADR_BREN)
+ phys_desc += 32;
+ else
+ phys_desc = desc->ddadr;
+ }
+ if (i == max_show)
+ pos += seq_printf(s,
+ "[%03d] Desc at %08lx ... max display reached\n",
+ i, phys_desc);
+ else
+ pos += seq_printf(s, "[%03d] Desc at %08lx is %s\n",
+ i, phys_desc, phys_desc == DDADR_STOP ?
+ "DDADR_STOP" : "invalid");
+
+out:
+ spin_unlock_irqrestore(&dbgfs_lock, flags);
+ return pos;
+}
+
+static int dbg_show_chan_state(struct seq_file *s, void *p)
+{
+ int pos = 0;
+ struct pxa_dmac_chan *dmac = (struct pxa_dmac_chan *)s->private;
+ int chan = dmac->idx;
+ u32 dcsr, dcmd;
+ int burst, width;
+ static char *str_prio[] = { "high", "normal", "low" };
+
+ dcsr = DCSR(chan);
+ dcmd = DCMD(chan);
+ burst = dbg_burst_from_dcmd(dcmd);
+ width = (1 << ((dcmd >> 14) & 0x3)) >> 1;
+
+ pos += seq_printf(s, "DMA channel %d\n", chan);
+ pos += seq_printf(s, "\tPriority : %s\n",
+ str_prio[dmac->prio]);
+ pos += seq_printf(s, "\tUnaligned transfer bit: %s\n",
+ DALGN & (1 << chan) ? "yes" : "no");
+ pos += seq_printf(s,
+ "\tDCSR = %08x (%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s)\n",
+ dcsr, DCSR_STR(RUN), DCSR_STR(NODESC),
+ DCSR_STR(STOPIRQEN), DCSR_STR(EORIRQEN),
+ DCSR_STR(EORJMPEN), DCSR_STR(EORSTOPEN),
+ DCSR_STR(SETCMPST), DCSR_STR(CLRCMPST),
+ DCSR_STR(CMPST), DCSR_STR(EORINTR), DCSR_STR(REQPEND),
+ DCSR_STR(STOPSTATE), DCSR_STR(ENDINTR),
+ DCSR_STR(STARTINTR), DCSR_STR(BUSERR));
+
+ pos += seq_printf(s, "\tDCMD = %08x (%s%s%s%s%s%s%sburst=%d width=%d"
+ " len=%d)\n",
+ dcmd,
+ DCMD_STR(INCSRCADDR), DCMD_STR(INCTRGADDR),
+ DCMD_STR(FLOWSRC), DCMD_STR(FLOWTRG),
+ DCMD_STR(STARTIRQEN), DCMD_STR(ENDIRQEN),
+ DCMD_STR(ENDIAN), burst, width, dcmd & DCMD_LENGTH);
+ pos += seq_printf(s, "\tDSADR = %08x\n", DSADR(chan));
+ pos += seq_printf(s, "\tDTADR = %08x\n", DTADR(chan));
+ pos += seq_printf(s, "\tDDADR = %08x\n", DDADR(chan));
+ return pos;
+}
+
+static int dbg_show_state(struct seq_file *s, void *p)
+{
+ int pos = 0;
+
+ /* basic device status */
+ pos += seq_printf(s, "DMA engine status\n");
+ pos += seq_printf(s, "\tChannel number: %d\n", num_dma_channels);
+
+ return pos;
+}
+
+#define DBGFS_FUNC_DECL(name) \
+static int dbg_open_##name(struct inode *inode, struct file *file) \
+{ \
+ return single_open(file, dbg_show_##name, inode->i_private); \
+} \
+static const struct file_operations dbg_fops_##name = { \
+ .owner = THIS_MODULE, \
+ .open = dbg_open_##name, \
+ .llseek = seq_lseek, \
+ .read = seq_read, \
+ .release = single_release, \
+}
+
+DBGFS_FUNC_DECL(state);
+DBGFS_FUNC_DECL(chan_state);
+DBGFS_FUNC_DECL(descriptors);
+DBGFS_FUNC_DECL(requester_chan);
+
+static struct dentry *pxa_dmac_dbg_alloc_chan(int ch,
+ struct dentry *chandir, void *dt)
+{
+ char chan_name[11];
+ struct dentry *chan, *chan_state = NULL, *chan_descr = NULL;
+ struct dentry *chan_reqs = NULL;
+
+ scnprintf(chan_name, sizeof(chan_name), "%d", ch);
+ chan = debugfs_create_dir(chan_name, chandir);
+
+ if (chan)
+ chan_state = debugfs_create_file("state", 0400, chan, dt,
+ &dbg_fops_chan_state);
+ if (chan_state)
+ chan_descr = debugfs_create_file("descriptors", 0400, chan, dt,
+ &dbg_fops_descriptors);
+ if (chan_descr)
+ chan_reqs = debugfs_create_file("requesters", 0400, chan, dt,
+ &dbg_fops_requester_chan);
+ if (!chan_reqs)
+ goto err_state;
+
+ return chan;
+
+err_state:
+ debugfs_remove_recursive(chan);
+ return NULL;
+}
+
+static void pxa_dmac_init_debugfs(int nr_ch, struct pxa_dmac_chan *dmac)
+{
+ int i;
+ struct dentry *chandir;
+
+ num_dma_channels = nr_ch;
+
+ dbgfs_root = debugfs_create_dir(DMA_DEBUG_NAME, NULL);
+ if (IS_ERR(dbgfs_root) || !dbgfs_root)
+ goto err_root;
+
+ dbgfs_state = debugfs_create_file("state", 0400, dbgfs_root, NULL,
+ &dbg_fops_state);
+ if (!dbgfs_state)
+ goto err_state;
+
+ dbgfs_chan = kmalloc(sizeof(*dbgfs_state) * num_dma_channels,
+ GFP_KERNEL);
+ if (!dbgfs_chan)
+ goto err_alloc;
+
+ chandir = debugfs_create_dir("channels", dbgfs_root);
+ if (!chandir)
+ goto err_chandir;
+
+ for (i = 0; i < num_dma_channels; i++) {
+ dbgfs_chan[i] = pxa_dmac_dbg_alloc_chan(i, chandir, &dmac[i]);
+ if (!dbgfs_chan[i])
+ goto err_chans;
+ }
+
+ spin_lock_init(&dbgfs_lock);
+ return;
+err_chans:
+err_chandir:
+ kfree(dbgfs_chan);
+err_alloc:
+err_state:
+ debugfs_remove_recursive(dbgfs_root);
+err_root:
+ dev_dbg(dmac->pxa_dmac->dev, "pxa_dma: debugfs is not available\n");
+}
+
+static void __exit pxa_dmac_cleanup_debugfs(void)
+{
+ debugfs_remove_recursive(dbgfs_root);
+}
+#else
+static inline void pxa_dmac_init_debugfs(nr_ch) {}
+static inline void pxa_dmac_cleanup_debugfs(void) {}
+#endif
+
+#ifdef DEBUG
+static void pxa_dmac_dump_dma_list(struct pxa_dmac_chan *dmac)
+{
+ struct pxa_dma_desc *desc = dmac->desc_arr;
+ unsigned long flags;
+
+ if (!desc) {
+ dev_dbg(dmac->pxa_dmac->dev,
+ "dma description list has no node!\n");
+ return;
+ }
+
+ local_irq_save(flags);
+
+ dev_dbg(dmac->pxa_dmac->dev, "dma description list nodes:\n");
+ do {
+ dev_dbg(dmac->pxa_dmac->dev, ("---------------------\n");
+ dev_dbg(dmac->pxa_dmac->dev, "ddadr = 0x%08x\n", desc->ddadr);
+ dev_dbg(dmac->pxa_dmac->dev, "dsadr = 0x%08x\n", desc->dsadr);
+ dev_dbg(dmac->pxa_dmac->dev, "dtadr = 0x%08x\n", desc->dtadr);
+ dev_dbg(dmac->pxa_dmac->dev, "dcmd = 0x%08x\n", desc->dcmd);
+
+ if (desc->ddadr & DDADR_STOP)
+ break;
+
+ desc = (pxa_dma_desc *)((desc->ddadr & DDADR_DESCADDR) -
+ (int)dmac->desc_arr_phys +
+ (int)dmac->desc_arr);
+
+ } while (desc != dmac->desc_arr);
+
+ local_irq_restore(flags);
+ return;
+}
+#else
+#define pxa_dmac_dump_dma_list(dmac) do { } while (0)
+#endif
+
+static struct pxa_dmac_chan *to_pxa_dmac_chan(struct dma_chan *chan)
+{
+ return container_of(chan, struct pxa_dmac_chan, chan);
+}
+
+static void pxa_dmac_enable_chan(struct pxa_dmac_chan *dmac)
+{
+ DCSR(dmac->idx) = DCSR(dmac->idx) | DCSR_RUN;
+
+ dev_dbg(dmac->pxa_dmac->dev, "%s: [%x] DCSR %x\n",
+ __func__, dmac->idx, DCSR(dmac->idx));
+}
+
+static void pxa_dmac_disable_chan(struct pxa_dmac_chan *dmac)
+{
+ DCSR(dmac->idx) = DCSR(dmac->idx) & ~DCSR_RUN;
+
+ dmac->status = DMA_SUCCESS;
+}
+
+static void pxa_dmac_resume_chan(struct pxa_dmac_chan *dmac)
+{
+ DCSR(dmac->idx) = DCSR(dmac->idx) | DCSR_RUN;
+
+ dmac->status = DMA_IN_PROGRESS;
+}
+
+static void pxa_dmac_pause_chan(struct pxa_dmac_chan *dmac)
+{
+ DCSR(dmac->idx) = DCSR(dmac->idx) & ~DCSR_RUN;
+
+ dmac->status = DMA_PAUSED;
+}
+
+static dma_cookie_t pxa_dmac_assign_cookie(struct pxa_dmac_chan *dmac)
+{
+ dma_cookie_t cookie = dmac->chan.cookie;
+
+ if (++cookie < 0)
+ cookie = 1;
+
+ dmac->chan.cookie = cookie;
+ dmac->desc.cookie = cookie;
+
+ return cookie;
+}
+
+unsigned long pxa_dmac_chan_get_src_ptr(struct dma_chan *chan)
+{
+ struct pxa_dmac_chan *dmac = to_pxa_dmac_chan(chan);
+
+ return DSADR(dmac->idx);
+}
+EXPORT_SYMBOL(pxa_dmac_chan_get_src_ptr);
+
+unsigned long pxa_dmac_chan_get_dst_ptr(struct dma_chan *chan)
+{
+ struct pxa_dmac_chan *dmac = to_pxa_dmac_chan(chan);
+
+ return DTADR(dmac->idx);
+}
+EXPORT_SYMBOL(pxa_dmac_chan_get_dst_ptr);
+
+pxa_dma_prio pxa_dmac_chan_get_prio(struct dma_chan *chan)
+{
+ struct pxa_dmac_chan *dmac = to_pxa_dmac_chan(chan);
+
+ return dmac->prio;
+}
+EXPORT_SYMBOL(pxa_dmac_chan_get_prio);
+
+static dma_cookie_t pxa_dmac_tx_submit(struct dma_async_tx_descriptor *tx)
+{
+ struct pxa_dmac_chan *dmac = to_pxa_dmac_chan(tx->chan);
+
+ pxa_dmac_enable_chan(dmac);
+
+ return pxa_dmac_assign_cookie(dmac);
+}
+
+static irqreturn_t pxa_dmac_int_handler(int irq, void *dev_id)
+{
+ struct pxa_dmac_chan *dmac = dev_id;
+
+ if (DCSR(dmac->idx) & DCSR_BUSERR) {
+ dev_err(dmac->pxa_dmac->dev, "%s: error in channel %d\n",
+ __func__, dmac->idx);
+
+ dmac->status = DMA_ERROR;
+ } else {
+ if (dmac->flags & DMAC_CYCLIC_LOOP)
+ dmac->status = DMA_IN_PROGRESS;
+ else
+ dmac->status = DMA_SUCCESS;
+ }
+
+ if (dmac->status == DMA_SUCCESS)
+ dmac->last_completed = dmac->desc.cookie;
+
+ /* clear irq */
+ DCSR(dmac->idx) = DCSR(dmac->idx) | DCSR_STARTINTR |
+ DCSR_ENDINTR | DCSR_BUSERR;
+
+ if (dmac->desc.callback)
+ dmac->desc.callback(dmac->desc.callback_param);
+
+ return IRQ_HANDLED;
+}
+
+static int pxa_dmac_alloc_descriptor(struct pxa_dmac_chan *dmac)
+{
+ struct pxa_dmac_engine *pxa_dmac = dmac->pxa_dmac;
+
+ dev_dbg(dmac->pxa_dmac->dev, "%s: enter\n", __func__);
+
+ dmac->desc_arr = dma_alloc_coherent(pxa_dmac->dev,
+ DMAC_DESC_SIZE, &dmac->desc_arr_phys, GFP_KERNEL);
+ if (!dmac->desc_arr)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void pxa_dmac_free_descriptor(struct pxa_dmac_chan *dmac)
+{
+ struct pxa_dmac_engine *pxa_dmac = dmac->pxa_dmac;
+
+ dma_free_coherent(pxa_dmac->dev, DMAC_DESC_SIZE,
+ dmac->desc_arr, dmac->desc_arr_phys);
+}
+
+static int pxa_dmac_alloc_chan_resources(struct dma_chan *chan)
+{
+ struct pxa_dmac_chan *dmac = to_pxa_dmac_chan(chan);
+ int ret;
+
+ dev_dbg(dmac->pxa_dmac->dev, "%s: enter\n", __func__);
+
+ ret = pxa_dmac_alloc_descriptor(dmac);
+ if (ret < 0)
+ return ret;
+
+ dma_async_tx_descriptor_init(&dmac->desc, chan);
+ dmac->desc.tx_submit = pxa_dmac_tx_submit;
+
+ /* the descriptor is ready */
+ async_tx_ack(&dmac->desc);
+
+ ret = request_irq(dmac->irq, pxa_dmac_int_handler, IRQF_DISABLED,
+ "dmac", dmac);
+ if (ret)
+ goto err_request_irq;
+
+ /*
+ * init command register for default config,
+ * later user can call dmaengine_slave_config
+ * to config more settings.
+ */
+ dmac->dcmd = DCMD_ENDIRQEN | DCMD_BURST8;
+ return 0;
+
+err_request_irq:
+ pxa_dmac_free_descriptor(dmac);
+ return ret;
+}
+
+static void pxa_dmac_free_chan_resources(struct dma_chan *chan)
+{
+ struct pxa_dmac_chan *dmac = to_pxa_dmac_chan(chan);
+
+ dev_dbg(dmac->pxa_dmac->dev, "%s: enter\n", __func__);
+
+ free_irq(dmac->irq, dmac);
+ pxa_dmac_disable_chan(dmac);
+ pxa_dmac_free_descriptor(dmac);
+}
+
+static int pxa_dmac_config_chan(struct pxa_dmac_chan *dmac)
+{
+ struct pxa_dmac_engine *pxa_dmac = dmac->pxa_dmac;
+ struct pxa_dmac_data *dmac_data = dmac->chan.private;
+
+ pxa_dmac_disable_chan(dmac);
+
+ if (dmac->dir == DMA_TO_DEVICE) {
+ dmac->dcmd |= DCMD_INCSRCADDR;
+ if (dmac_data->flow_ctrl)
+ dmac->dcmd |= DCMD_FLOWTRG;
+ } else if (dmac->dir == DMA_FROM_DEVICE) {
+ dmac->dcmd |= DCMD_INCTRGADDR;
+ if (dmac_data->flow_ctrl)
+ dmac->dcmd |= DCMD_FLOWSRC;
+ } else
+ dmac->dcmd |= DCMD_INCSRCADDR | DCMD_INCTRGADDR;
+
+ switch (dmac->burst_sz) {
+ case 8: /* 8 bytes */
+ dmac->dcmd |= DCMD_BURST8;
+ break;
+ case 16: /* 16 bytes */
+ dmac->dcmd |= DCMD_BURST16;
+ break;
+ case 32: /* 32 bytes */
+ dmac->dcmd |= DCMD_BURST32;
+ break;
+ default:
+ dev_err(pxa_dmac->dmac_device.dev, "invalid burst size\n");
+ return -EINVAL;
+ }
+
+ switch (dmac->width) {
+ case DMA_SLAVE_BUSWIDTH_UNDEFINED:
+ break;
+ case DMA_SLAVE_BUSWIDTH_1_BYTE:
+ dmac->dcmd |= DCMD_WIDTH1;
+ break;
+ case DMA_SLAVE_BUSWIDTH_2_BYTES:
+ dmac->dcmd |= DCMD_WIDTH2;
+ break;
+ case DMA_SLAVE_BUSWIDTH_4_BYTES:
+ dmac->dcmd |= DCMD_WIDTH4;
+ break;
+ default:
+ dev_err(pxa_dmac->dmac_device.dev, "invalid width size\n");
+ return -EINVAL;
+ }
+
+ dmac->ch_map = dmac_data->ch_map;
+ if (dmac->ch_map != -1)
+ DRCMR(dmac->ch_map) = dmac->idx | DRCMR_MAPVLD;
+
+ return 0;
+}
+
+static struct dma_async_tx_descriptor *pxa_dmac_prep_memcpy(
+ struct dma_chan *chan,
+ dma_addr_t dma_dst, dma_addr_t dma_src,
+ size_t len, unsigned long flags)
+{
+ struct pxa_dmac_chan *dmac;
+ struct pxa_dma_desc *desc;
+ size_t copy;
+ int i = 0;
+
+ if (!chan || !len)
+ return NULL;
+
+ dmac = to_pxa_dmac_chan(chan);
+ dmac->status = DMA_IN_PROGRESS;
+
+ dmac->dcmd |= DCMD_INCSRCADDR | DCMD_INCTRGADDR;
+
+ dev_dbg(dmac->pxa_dmac->dev, "%s: desc_arr %p desc_arr_phys %x\n",
+ __func__, dmac->desc_arr, dmac->desc_arr_phys);
+
+ do {
+ dev_dbg(dmac->pxa_dmac->dev, "%s: dst %x src %x len %d\n",
+ __func__, dma_dst, dma_src, len);
+
+ desc = &dmac->desc_arr[i];
+ copy = min(len, (size_t)DMAC_MAX_XFER_BYTES);
+
+ desc->ddadr = dmac->desc_arr_phys + sizeof(*desc) * (i + 1);
+ desc->dsadr = dma_src;
+ desc->dtadr = dma_dst;
+ desc->dcmd = dmac->dcmd | copy;
+
+ len -= copy;
+ dma_src += copy;
+ dma_dst += copy;
+
+ if (!len)
+ desc->ddadr |= DDADR_STOP;
+
+ i++;
+ } while (len);
+
+ DDADR(dmac->idx) = dmac->desc_arr_phys;
+
+ pxa_dmac_dump_dma_list(dmac);
+ return &dmac->desc;
+}
+
+static struct dma_async_tx_descriptor *pxa_dmac_prep_sg(struct dma_chan *chan,
+ struct scatterlist *dst_sg, unsigned int dst_nents,
+ struct scatterlist *src_sg, unsigned int src_nents,
+ unsigned long flags)
+{
+ struct pxa_dmac_chan *dmac;
+ struct pxa_dma_desc *desc = NULL;
+ size_t dst_avail, src_avail;
+ dma_addr_t dst, src;
+ size_t len;
+ int i = 0;
+
+ /* basic sanity checks */
+ if (dst_nents == 0 || src_nents == 0)
+ return NULL;
+
+ if (dst_sg == NULL || src_sg == NULL)
+ return NULL;
+
+ dmac = to_pxa_dmac_chan(chan);
+ dmac->status = DMA_IN_PROGRESS;
+
+ dmac->dcmd |= DCMD_INCSRCADDR | DCMD_INCTRGADDR;
+
+ /* get prepared for the loop */
+ dst_avail = sg_dma_len(dst_sg);
+ src_avail = sg_dma_len(src_sg);
+
+ /* run until we are out of scatterlist entries */
+ while (true) {
+
+ dev_dbg(dmac->pxa_dmac->dev, "%s: dst_avail %x src_avail %x\n",
+ __func__, dst_avail, src_avail);
+
+ /* create the largest transaction possible */
+ len = min_t(size_t, src_avail, dst_avail);
+ len = min_t(size_t, len, DMAC_MAX_XFER_BYTES);
+ if (len == 0)
+ goto fetch;
+
+ dst = sg_dma_address(dst_sg) + sg_dma_len(dst_sg) - dst_avail;
+ src = sg_dma_address(src_sg) + sg_dma_len(src_sg) - src_avail;
+
+ dev_dbg(dmac->pxa_dmac->dev, "%s: dst %x src %x len %x\n",
+ __func__, dst, src, len);
+
+ if (i >= DMAC_DESC_NUM)
+ goto fail;
+
+ desc = &dmac->desc_arr[i];
+ desc->ddadr = dmac->desc_arr_phys + sizeof(*desc) * (i + 1);
+ desc->dsadr = src;
+ desc->dtadr = dst;
+ desc->dcmd = dmac->dcmd | len;
+
+ /* update metadata */
+ dst_avail -= len;
+ src_avail -= len;
+ i++;
+
+fetch:
+ /* fetch the next dst scatterlist entry */
+ if (dst_avail == 0) {
+
+ /* no more entries: we're done */
+ if (dst_nents == 0)
+ break;
+
+ /* fetch the next entry: if there are no more: done */
+ dst_sg = sg_next(dst_sg);
+ if (dst_sg == NULL)
+ break;
+
+ dst_nents--;
+ dst_avail = sg_dma_len(dst_sg);
+ }
+
+ /* fetch the next src scatterlist entry */
+ if (src_avail == 0) {
+
+ /* no more entries: we're done */
+ if (src_nents == 0)
+ break;
+
+ /* fetch the next entry: if there are no more: done */
+ src_sg = sg_next(src_sg);
+ if (src_sg == NULL)
+ break;
+
+ src_nents--;
+ src_avail = sg_dma_len(src_sg);
+ }
+ }
+
+ if (desc)
+ desc->ddadr |= DDADR_STOP;
+
+ DDADR(dmac->idx) = dmac->desc_arr_phys;
+
+ pxa_dmac_dump_dma_list(dmac);
+ return &dmac->desc;
+
+fail:
+ return NULL;
+}
+
+static struct dma_async_tx_descriptor *pxa_dmac_prep_slave_sg(
+ struct dma_chan *chan, struct scatterlist *sgl,
+ unsigned int sg_len, enum dma_data_direction direction,
+ unsigned long append)
+{
+ struct pxa_dmac_chan *dmac;
+ struct pxa_dma_desc *desc = NULL;
+ struct scatterlist *sg;
+ size_t avail, len;
+ dma_addr_t slave_addr;
+ unsigned int i;
+
+ if (!sgl || !sg_len)
+ return NULL;
+
+ dmac = to_pxa_dmac_chan(chan);
+ dmac->status = DMA_IN_PROGRESS;
+
+ slave_addr = dmac->dev_addr;
+ for_each_sg(sgl, sg, sg_len, i) {
+ dma_addr_t sg_addr = sg_dma_address(sg);
+ avail = sg_dma_len(sg);
+ do {
+ len = min_t(size_t, avail, DMAC_MAX_XFER_BYTES);
+
+ dev_dbg(dmac->pxa_dmac->dev,
+ "Add SG #%d@%p[%d], dma %llx\n",
+ i, sg, len, (unsigned long long)sg_addr);
+
+ if (i >= DMAC_DESC_NUM)
+ goto fail;
+
+ desc = &dmac->desc_arr[i];
+ desc->ddadr = dmac->desc_arr_phys +
+ sizeof(*desc) * (i + 1);
+ if (direction == DMA_FROM_DEVICE) {
+ desc->dtadr = sg_addr;
+ desc->dsadr = slave_addr;
+ desc->dcmd = dmac->dcmd | len;
+ } else {
+ desc->dtadr = slave_addr;
+ desc->dsadr = sg_addr;
+ desc->dcmd = dmac->dcmd | len;
+ }
+
+ avail -= len;
+ sg_addr += len;
+ i++;
+
+ } while (avail);
+ }
+
+ if (desc)
+ desc->ddadr |= DDADR_STOP;
+
+ DDADR(dmac->idx) = dmac->desc_arr_phys;
+
+ pxa_dmac_dump_dma_list(dmac);
+ return &dmac->desc;
+
+fail:
+ return NULL;
+}
+
+static int pxa_dmac_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
+ unsigned long arg)
+{
+ struct pxa_dmac_chan *dmac = to_pxa_dmac_chan(chan);
+ struct dma_slave_config *dmaengine_cfg = (void *)arg;
+ int ret = 0;
+
+ switch (cmd) {
+ case DMA_TERMINATE_ALL:
+ pxa_dmac_disable_chan(dmac);
+ break;
+ case DMA_PAUSE:
+ pxa_dmac_pause_chan(dmac);
+ break;
+ case DMA_RESUME:
+ pxa_dmac_resume_chan(dmac);
+ break;
+ case DMA_SLAVE_CONFIG:
+ if (dmaengine_cfg->direction == DMA_FROM_DEVICE) {
+ dmac->dev_addr = dmaengine_cfg->src_addr;
+ dmac->burst_sz = dmaengine_cfg->src_maxburst;
+ dmac->width = dmaengine_cfg->src_addr_width;
+ } else {
+ dmac->dev_addr = dmaengine_cfg->dst_addr;
+ dmac->burst_sz = dmaengine_cfg->dst_maxburst;
+ dmac->width = dmaengine_cfg->dst_addr_width;
+ }
+ dmac->dir = dmaengine_cfg->direction;
+ return pxa_dmac_config_chan(dmac);
+ default:
+ ret = -ENOSYS;
+ }
+
+ return ret;
+}
+
+static enum dma_status pxa_dmac_tx_status(struct dma_chan *chan,
+ dma_cookie_t cookie, struct dma_tx_state *txstate)
+{
+ struct pxa_dmac_chan *dmac = to_pxa_dmac_chan(chan);
+ dma_cookie_t last_used;
+
+ last_used = chan->cookie;
+ dma_set_tx_state(txstate, dmac->last_completed, last_used, 0);
+
+ return dmac->status;
+}
+
+static void pxa_dmac_issue_pending(struct dma_chan *chan)
+{
+ /*
+ * Nothing to do. We only have a single descriptor.
+ */
+}
+
+static void pxa_dmac_irq_ack(struct irq_data *d)
+{
+ DCSR(d->irq - dma_irq_base) = DCSR(d->irq - dma_irq_base) |
+ DCSR_STARTINTR | DCSR_ENDINTR | DCSR_BUSERR;
+}
+
+static void pxa_dmac_irq_mask(struct irq_data *d)
+{
+ DCSR(d->irq - dma_irq_base) = DCSR(d->irq - dma_irq_base) &
+ ~DCSR_STOPIRQEN;
+}
+
+static void pxa_dmac_irq_unmask(struct irq_data *d)
+{
+ /*
+ * As manual say, if the STOPIRQEN bit is set
+ * before the channel is started, an interrupt
+ * will be generated. So let driver set this bit
+ * after the channel has began to run.
+ */
+}
+
+static void pxa_dma_demux_handler(unsigned int irq, struct irq_desc *desc)
+{
+ int i, dint = DINT;
+
+ while (dint) {
+ i = __ffs(dint);
+ dint &= (dint - 1);
+ generic_handle_irq(dma_irq_base + i);
+ }
+}
+
+static struct irq_chip pxa_muxed_dma_chip = {
+ .name = "DMAC",
+ .irq_ack = pxa_dmac_irq_ack,
+ .irq_mask = pxa_dmac_irq_mask,
+ .irq_unmask = pxa_dmac_irq_unmask,
+};
+
+static int __init pxa_dmac_init_irq(int mux_irq, int second_irq_start,
+ int num_ch)
+{
+ int i = 0, irq;
+ struct irq_data *d;
+ struct irq_chip *chip = &pxa_muxed_dma_chip;
+
+ /* init dma irq */
+ for (irq = second_irq_start; i < num_ch; irq++, i++) {
+ d = irq_get_irq_data(irq);
+
+ /* mask and clear the IRQ */
+ chip->irq_mask(d);
+ if (chip->irq_ack)
+ chip->irq_ack(d);
+
+ irq_set_chip(irq, chip);
+ set_irq_flags(irq, IRQF_VALID);
+ irq_set_handler(irq, handle_level_irq);
+ }
+ irq_set_chained_handler(mux_irq, pxa_dma_demux_handler);
+
+ return 0;
+}
+
+static int __init pxa_dmac_probe(struct platform_device *pdev)
+{
+ struct pxa_dmac_engine *pxa_dmac;
+ struct pxa_dmac_chan *dmac;
+ struct resource *iores;
+ struct pxa_dmac_platform_data *pdata = pdev->dev.platform_data;
+ int i, irq;
+ int ret;
+
+ if (!pdata)
+ return -ENODEV;
+
+ dma_irq_base = pdata->irq_base;
+
+ pxa_dmac = kzalloc(pdata->nr_ch * (sizeof(*dmac)) +
+ sizeof(*pxa_dmac), GFP_KERNEL);
+ if (!pxa_dmac)
+ return -ENOMEM;
+
+ iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!iores) {
+ ret = -EINVAL;
+ goto err_irq;
+ }
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ dev_info(&pdev->dev, "No interrupt specified\n");
+ else
+ pxa_dmac_init_irq(irq, pdata->irq_base, pdata->nr_ch);
+
+ if (!request_mem_region(iores->start, resource_size(iores),
+ pdev->name)) {
+ ret = -EBUSY;
+ goto err_request_region;
+ }
+
+ pxa_dmac->base = ioremap(iores->start, resource_size(iores));
+ if (!pxa_dmac->base) {
+ ret = -ENOMEM;
+ goto err_ioremap;
+ }
+
+ dma_cap_set(DMA_MEMCPY, pxa_dmac->dmac_device.cap_mask);
+ dma_cap_set(DMA_SLAVE, pxa_dmac->dmac_device.cap_mask);
+ dma_cap_set(DMA_SG, pxa_dmac->dmac_device.cap_mask);
+
+ INIT_LIST_HEAD(&pxa_dmac->dmac_device.channels);
+
+ /* initialize channel parameters */
+ for (i = 0; i < pdata->nr_ch; i++) {
+
+ dmac = &pxa_dmac->dmac[i];
+
+ /*
+ * dma channel priorities on pxa2xx processors:
+ * ch 0 - 3, 16 - 19 <--> (0) DMA_PRIO_HIGH
+ * ch 4 - 7, 20 - 23 <--> (1) DMA_PRIO_MEDIUM
+ * ch 8 - 15, 24 - 31 <--> (2) DMA_PRIO_LOW
+ */
+ dmac->pxa_dmac = pxa_dmac;
+ dmac->chan.device = &pxa_dmac->dmac_device;
+ dmac->prio = min((i & 0xf) >> 2, DMA_PRIO_LOW);
+ dmac->irq = pdata->irq_base + i;
+ dmac->idx = i;
+
+ /* add the channel to tdma_chan list */
+ list_add_tail(&dmac->chan.device_node,
+ &pxa_dmac->dmac_device.channels);
+ }
+
+ pxa_dmac->dev = &pdev->dev;
+ pxa_dmac->dmac_nr = pdata->nr_ch;
+ pxa_dmac->dmac_device.dev = &pdev->dev;
+ pxa_dmac->dmac_device.device_alloc_chan_resources =
+ pxa_dmac_alloc_chan_resources;
+ pxa_dmac->dmac_device.device_free_chan_resources =
+ pxa_dmac_free_chan_resources;
+ pxa_dmac->dmac_device.device_prep_dma_memcpy = pxa_dmac_prep_memcpy;
+ pxa_dmac->dmac_device.device_prep_slave_sg = pxa_dmac_prep_slave_sg;
+ pxa_dmac->dmac_device.device_prep_dma_sg = pxa_dmac_prep_sg;
+ pxa_dmac->dmac_device.device_tx_status = pxa_dmac_tx_status;
+ pxa_dmac->dmac_device.device_issue_pending = pxa_dmac_issue_pending;
+ pxa_dmac->dmac_device.device_control = pxa_dmac_control;
+ pxa_dmac->dmac_device.copy_align = DMAC_ALIGNMENT;
+
+ dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
+
+ ret = dma_async_device_register(&pxa_dmac->dmac_device);
+ if (ret) {
+ dev_err(pxa_dmac->dmac_device.dev, "unable to register\n");
+ goto err_init;
+ }
+
+ pxa_dmac_init_debugfs(pdata->nr_ch, pxa_dmac->dmac);
+
+ dev_info(pxa_dmac->dmac_device.dev, "initialized\n");
+ return 0;
+
+err_init:
+ iounmap(pxa_dmac->base);
+err_ioremap:
+ release_mem_region(iores->start, resource_size(iores));
+err_request_region:
+err_irq:
+ kfree(pxa_dmac);
+ return ret;
+}
+
+static struct platform_driver pxa_dmac_driver = {
+ .driver = {
+ .name = "pxa-dmac",
+ },
+};
+
+static int __init pxa_dmac_module_init(void)
+{
+ return platform_driver_probe(&pxa_dmac_driver, pxa_dmac_probe);
+}
+subsys_initcall(pxa_dmac_module_init);
+
+MODULE_AUTHOR("Leo Yan <leoy@...vell.com>");
+MODULE_DESCRIPTION("PXA DMAC driver");
+MODULE_LICENSE("GPL");
--
1.7.0.4
--
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