+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/fs.h>
+#include <linux/errno.h>
+#include <linux/stat.h>
+#include <linux/mm.h>
+#include <linux/tty.h>
+#include <linux/selection.h>
+#include <linux/kmod.h>
+#include <linux/vmalloc.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <asm/uaccess.h>
+#include <linux/errno.h>
+#include <asm/io.h>
+
+#include <asm/ifxmips/ifxmips.h>
+#include <asm/ifxmips/ifxmips_irq.h>
+#include <asm/ifxmips/ifxmips_dma.h>
+#include <asm/ifxmips/ifxmips_pmu.h>
+
+/*25 descriptors for each dma channel,4096/8/20=25.xx*/
+#define IFXMIPS_DMA_DESCRIPTOR_OFFSET 25
+
+#define MAX_DMA_DEVICE_NUM 6 /*max ports connecting to dma */
+#define MAX_DMA_CHANNEL_NUM 20 /*max dma channels */
+#define DMA_INT_BUDGET 100 /*budget for interrupt handling */
+#define DMA_POLL_COUNTER 4 /*fix me, set the correct counter value here! */
+
+extern void mask_and_ack_ifxmips_irq (unsigned int irq_nr);
+extern void enable_ifxmips_irq (unsigned int irq_nr);
+extern void disable_ifxmips_irq (unsigned int irq_nr);
+
+u64 *g_desc_list;
+_dma_device_info dma_devs[MAX_DMA_DEVICE_NUM];
+_dma_channel_info dma_chan[MAX_DMA_CHANNEL_NUM];
+
+char global_device_name[MAX_DMA_DEVICE_NUM][20] =
+ { {"PPE"}, {"DEU"}, {"SPI"}, {"SDIO"}, {"MCTRL0"}, {"MCTRL1"} };
+
+_dma_chan_map default_dma_map[MAX_DMA_CHANNEL_NUM] = {
+ {"PPE", IFXMIPS_DMA_RX, 0, IFXMIPS_DMA_CH0_INT, 0},
+ {"PPE", IFXMIPS_DMA_TX, 0, IFXMIPS_DMA_CH1_INT, 0},
+ {"PPE", IFXMIPS_DMA_RX, 1, IFXMIPS_DMA_CH2_INT, 1},
+ {"PPE", IFXMIPS_DMA_TX, 1, IFXMIPS_DMA_CH3_INT, 1},
+ {"PPE", IFXMIPS_DMA_RX, 2, IFXMIPS_DMA_CH4_INT, 2},
+ {"PPE", IFXMIPS_DMA_TX, 2, IFXMIPS_DMA_CH5_INT, 2},
+ {"PPE", IFXMIPS_DMA_RX, 3, IFXMIPS_DMA_CH6_INT, 3},
+ {"PPE", IFXMIPS_DMA_TX, 3, IFXMIPS_DMA_CH7_INT, 3},
+ {"DEU", IFXMIPS_DMA_RX, 0, IFXMIPS_DMA_CH8_INT, 0},
+ {"DEU", IFXMIPS_DMA_TX, 0, IFXMIPS_DMA_CH9_INT, 0},
+ {"DEU", IFXMIPS_DMA_RX, 1, IFXMIPS_DMA_CH10_INT, 1},
+ {"DEU", IFXMIPS_DMA_TX, 1, IFXMIPS_DMA_CH11_INT, 1},
+ {"SPI", IFXMIPS_DMA_RX, 0, IFXMIPS_DMA_CH12_INT, 0},
+ {"SPI", IFXMIPS_DMA_TX, 0, IFXMIPS_DMA_CH13_INT, 0},
+ {"SDIO", IFXMIPS_DMA_RX, 0, IFXMIPS_DMA_CH14_INT, 0},
+ {"SDIO", IFXMIPS_DMA_TX, 0, IFXMIPS_DMA_CH15_INT, 0},
+ {"MCTRL0", IFXMIPS_DMA_RX, 0, IFXMIPS_DMA_CH16_INT, 0},
+ {"MCTRL0", IFXMIPS_DMA_TX, 0, IFXMIPS_DMA_CH17_INT, 0},
+ {"MCTRL1", IFXMIPS_DMA_RX, 1, IFXMIPS_DMA_CH18_INT, 1},
+ {"MCTRL1", IFXMIPS_DMA_TX, 1, IFXMIPS_DMA_CH19_INT, 1}
+};
+
+_dma_chan_map *chan_map = default_dma_map;
+volatile u32 g_ifxmips_dma_int_status = 0;
+volatile int g_ifxmips_dma_in_process = 0;/*0=not in process,1=in process*/
+
+void do_dma_tasklet (unsigned long);
+DECLARE_TASKLET (dma_tasklet, do_dma_tasklet, 0);
+
+u8*
+common_buffer_alloc (int len, int *byte_offset, void **opt)
+{
+ u8 *buffer = (u8 *) kmalloc (len * sizeof (u8), GFP_KERNEL);
+
+ *byte_offset = 0;
+
+ return buffer;
+}
+
+void
+common_buffer_free (u8 *dataptr, void *opt)
+{
+ if (dataptr)
+ kfree(dataptr);
+}
+
+void
+enable_ch_irq (_dma_channel_info *pCh)
+{
+ int chan_no = (int)(pCh - dma_chan);
+ int flag;
+
+ local_irq_save(flag);
+ writel(chan_no, IFXMIPS_DMA_CS);
+ writel(0x4a, IFXMIPS_DMA_CIE);
+ writel(readl(IFXMIPS_DMA_IRNEN) | (1 << chan_no), IFXMIPS_DMA_IRNEN);
+ local_irq_restore(flag);
+ enable_ifxmips_irq(pCh->irq);
+}
+
+void
+disable_ch_irq (_dma_channel_info *pCh)
+{
+ int flag;
+ int chan_no = (int) (pCh - dma_chan);
+
+ local_irq_save(flag);
+ g_ifxmips_dma_int_status &= ~(1 << chan_no);
+ writel(chan_no, IFXMIPS_DMA_CS);
+ writel(0, IFXMIPS_DMA_CIE);
+ writel(readl(IFXMIPS_DMA_IRNEN) & ~(1 << chan_no), IFXMIPS_DMA_IRNEN);
+ local_irq_restore(flag);
+ mask_and_ack_ifxmips_irq(pCh->irq);
+}
+
+void
+open_chan (_dma_channel_info *pCh)
+{
+ int flag;
+ int chan_no = (int)(pCh - dma_chan);
+
+ local_irq_save(flag);
+ writel(chan_no, IFXMIPS_DMA_CS);
+ writel(readl(IFXMIPS_DMA_CCTRL) | 1, IFXMIPS_DMA_CCTRL);
+ if(pCh->dir == IFXMIPS_DMA_RX)
+ enable_ch_irq(pCh);
+ local_irq_restore(flag);
+}
+
+void
+close_chan(_dma_channel_info *pCh)
+{
+ int flag;
+ int chan_no = (int) (pCh - dma_chan);
+
+ local_irq_save(flag);
+ writel(chan_no, IFXMIPS_DMA_CS);
+ writel(readl(IFXMIPS_DMA_CCTRL) & ~1, IFXMIPS_DMA_CCTRL);
+ disable_ch_irq(pCh);
+ local_irq_restore(flag);
+}
+
+void
+reset_chan (_dma_channel_info *pCh)
+{
+ int chan_no = (int) (pCh - dma_chan);
+
+ writel(chan_no, IFXMIPS_DMA_CS);
+ writel(readl(IFXMIPS_DMA_CCTRL) | 2, IFXMIPS_DMA_CCTRL);
+}
+
+void
+rx_chan_intr_handler (int chan_no)
+{
+ _dma_device_info *pDev = (_dma_device_info *)dma_chan[chan_no].dma_dev;
+ _dma_channel_info *pCh = &dma_chan[chan_no];
+ struct rx_desc *rx_desc_p;
+ int tmp;
+ int flag;
+
+ /*handle command complete interrupt */
+ rx_desc_p = (struct rx_desc*)pCh->desc_base + pCh->curr_desc;
+ if (rx_desc_p->status.field.OWN == CPU_OWN
+ && rx_desc_p->status.field.C
+ && rx_desc_p->status.field.data_length < 1536){
+ /*Every thing is correct, then we inform the upper layer */
+ pDev->current_rx_chan = pCh->rel_chan_no;
+ if(pDev->intr_handler)
+ pDev->intr_handler(pDev, RCV_INT);
+ pCh->weight--;
+ } else {
+ local_irq_save(flag);
+ tmp = readl(IFXMIPS_DMA_CS);
+ writel(chan_no, IFXMIPS_DMA_CS);
+ writel(readl(IFXMIPS_DMA_CIS) | 0x7e, IFXMIPS_DMA_CIS);
+ writel(tmp, IFXMIPS_DMA_CS);
+ g_ifxmips_dma_int_status &= ~(1 << chan_no);
+ local_irq_restore(flag);
+ enable_ifxmips_irq(dma_chan[chan_no].irq);
+ }
+}
+
+inline void
+tx_chan_intr_handler (int chan_no)
+{
+ _dma_device_info *pDev = (_dma_device_info*)dma_chan[chan_no].dma_dev;
+ _dma_channel_info *pCh = &dma_chan[chan_no];
+ int tmp;
+ int flag;
+
+ local_irq_save(flag);
+ tmp = readl(IFXMIPS_DMA_CS);
+ writel(chan_no, IFXMIPS_DMA_CS);
+ writel(readl(IFXMIPS_DMA_CIS) | 0x7e, IFXMIPS_DMA_CIS);
+ writel(tmp, IFXMIPS_DMA_CS);
+ g_ifxmips_dma_int_status &= ~(1 << chan_no);
+ local_irq_restore(flag);
+ pDev->current_tx_chan = pCh->rel_chan_no;
+ if (pDev->intr_handler)
+ pDev->intr_handler(pDev, TRANSMIT_CPT_INT);
+}
+
+void
+do_dma_tasklet (unsigned long unused)
+{
+ int i;
+ int chan_no = 0;
+ int budget = DMA_INT_BUDGET;
+ int weight = 0;
+ int flag;
+
+ while (g_ifxmips_dma_int_status)
+ {
+ if (budget-- < 0)
+ {
+ tasklet_schedule(&dma_tasklet);
+ return;
+ }
+ chan_no = -1;
+ weight = 0;
+ for (i = 0; i < MAX_DMA_CHANNEL_NUM; i++)
+ {
+ if ((g_ifxmips_dma_int_status & (1 << i)) && dma_chan[i].weight > 0)
+ {
+ if (dma_chan[i].weight > weight)
+ {
+ chan_no = i;
+ weight = dma_chan[chan_no].weight;
+ }
+ }
+ }
+
+ if (chan_no >= 0)
+ {
+ if (chan_map[chan_no].dir == IFXMIPS_DMA_RX)
+ rx_chan_intr_handler(chan_no);
+ else
+ tx_chan_intr_handler(chan_no);
+ } else {
+ for (i = 0; i < MAX_DMA_CHANNEL_NUM; i++)
+ {
+ dma_chan[i].weight = dma_chan[i].default_weight;
+ }
+ }
+ }
+
+ local_irq_save(flag);
+ g_ifxmips_dma_in_process = 0;
+ if (g_ifxmips_dma_int_status)
+ {
+ g_ifxmips_dma_in_process = 1;
+ tasklet_schedule(&dma_tasklet);
+ }
+ local_irq_restore(flag);
+}
+
+irqreturn_t
+dma_interrupt (int irq, void *dev_id)
+{
+ _dma_channel_info *pCh;
+ int chan_no = 0;
+ int tmp;
+
+ pCh = (_dma_channel_info*)dev_id;
+ chan_no = (int)(pCh - dma_chan);
+ if (chan_no < 0 || chan_no > 19)
+ BUG();
+
+ tmp = readl(IFXMIPS_DMA_IRNEN);
+ writel(0, IFXMIPS_DMA_IRNEN);
+ g_ifxmips_dma_int_status |= 1 << chan_no;
+ writel(tmp, IFXMIPS_DMA_IRNEN);
+ mask_and_ack_ifxmips_irq(irq);
+
+ if (!g_ifxmips_dma_in_process)
+ {
+ g_ifxmips_dma_in_process = 1;
+ tasklet_schedule(&dma_tasklet);
+ }
+
+ return IRQ_HANDLED;
+}
+
+_dma_device_info*
+dma_device_reserve (char *dev_name)
+{
+ int i;
+
+ for (i = 0; i < MAX_DMA_DEVICE_NUM; i++)
+ {
+ if (strcmp(dev_name, dma_devs[i].device_name) == 0)
+ {
+ if (dma_devs[i].reserved)
+ return NULL;
+ dma_devs[i].reserved = 1;
+ break;
+ }
+ }
+
+ return &dma_devs[i];
+}
+
+void
+dma_device_release (_dma_device_info *dev)
+{
+ dev->reserved = 0;
+}
+
+void
+dma_device_register(_dma_device_info *dev)
+{
+ int i, j;
+ int chan_no = 0;
+ u8 *buffer;
+ int byte_offset;
+ int flag;
+ _dma_device_info *pDev;
+ _dma_channel_info *pCh;
+ struct rx_desc *rx_desc_p;
+ struct tx_desc *tx_desc_p;
+
+ for (i = 0; i < dev->max_tx_chan_num; i++)
+ {
+ pCh = dev->tx_chan[i];
+ if (pCh->control == IFXMIPS_DMA_CH_ON)
+ {
+ chan_no = (int)(pCh - dma_chan);
+ for (j = 0; j < pCh->desc_len; j++)
+ {
+ tx_desc_p = (struct tx_desc*)pCh->desc_base + j;
+ memset(tx_desc_p, 0, sizeof(struct tx_desc));
+ }
+ local_irq_save(flag);
+ writel(chan_no, IFXMIPS_DMA_CS);
+ /*check if the descriptor length is changed */
+ if (readl(IFXMIPS_DMA_CDLEN) != pCh->desc_len)
+ writel(pCh->desc_len, IFXMIPS_DMA_CDLEN);
+
+ writel(readl(IFXMIPS_DMA_CCTRL) & ~1, IFXMIPS_DMA_CCTRL);
+ writel(readl(IFXMIPS_DMA_CCTRL) | 2, IFXMIPS_DMA_CCTRL);
+ while (readl(IFXMIPS_DMA_CCTRL) & 2){};
+ writel(readl(IFXMIPS_DMA_IRNEN) | (1 << chan_no), IFXMIPS_DMA_IRNEN);
+ writel(0x30100, IFXMIPS_DMA_CCTRL); /*reset and enable channel,enable channel later */
+ local_irq_restore(flag);
+ }
+ }
+
+ for (i = 0; i < dev->max_rx_chan_num; i++)
+ {
+ pCh = dev->rx_chan[i];
+ if (pCh->control == IFXMIPS_DMA_CH_ON)
+ {
+ chan_no = (int)(pCh - dma_chan);
+
+ for (j = 0; j < pCh->desc_len; j++)
+ {
+ rx_desc_p = (struct rx_desc*)pCh->desc_base + j;
+ pDev = (_dma_device_info*)(pCh->dma_dev);
+ buffer = pDev->buffer_alloc(pCh->packet_size, &byte_offset, (void*)&(pCh->opt[j]));
+ if (!buffer)
+ break;
+
+ dma_cache_inv((unsigned long) buffer, pCh->packet_size);
+
+ rx_desc_p->Data_Pointer = (u32)CPHYSADDR((u32)buffer);
+ rx_desc_p->status.word = 0;
+ rx_desc_p->status.field.byte_offset = byte_offset;
+ rx_desc_p->status.field.OWN = DMA_OWN;
+ rx_desc_p->status.field.data_length = pCh->packet_size;
+ }
+
+ local_irq_save(flag);
+ writel(chan_no, IFXMIPS_DMA_CS);
+ /*check if the descriptor length is changed */
+ if (readl(IFXMIPS_DMA_CDLEN) != pCh->desc_len)
+ writel(pCh->desc_len, IFXMIPS_DMA_CDLEN);
+ writel(readl(IFXMIPS_DMA_CCTRL) & ~1, IFXMIPS_DMA_CCTRL);
+ writel(readl(IFXMIPS_DMA_CCTRL) | 2, IFXMIPS_DMA_CCTRL);
+ while (readl(IFXMIPS_DMA_CCTRL) & 2){};
+ writel(0x0a, IFXMIPS_DMA_CIE); /*fix me, should enable all the interrupts here? */
+ writel(readl(IFXMIPS_DMA_IRNEN) | (1 << chan_no), IFXMIPS_DMA_IRNEN);
+ writel(0x30000, IFXMIPS_DMA_CCTRL);
+ local_irq_restore(flag);
+ enable_ifxmips_irq(dma_chan[chan_no].irq);
+ }
+ }
+}
+
+void
+dma_device_unregister (_dma_device_info *dev)
+{
+ int i, j;
+ int chan_no;
+ _dma_channel_info *pCh;
+ struct rx_desc *rx_desc_p;
+ struct tx_desc *tx_desc_p;
+ int flag;
+
+ for (i = 0; i < dev->max_tx_chan_num; i++)
+ {
+ pCh = dev->tx_chan[i];
+ if (pCh->control == IFXMIPS_DMA_CH_ON)
+ {
+ chan_no = (int)(dev->tx_chan[i] - dma_chan);
+ local_irq_save (flag);
+ writel(chan_no, IFXMIPS_DMA_CS);
+ pCh->curr_desc = 0;
+ pCh->prev_desc = 0;
+ pCh->control = IFXMIPS_DMA_CH_OFF;
+ writel(0, IFXMIPS_DMA_CIE); /*fix me, should disable all the interrupts here? */
+ writel(readl(IFXMIPS_DMA_IRNEN) & ~(1 << chan_no), IFXMIPS_DMA_IRNEN); /*disable interrupts */
+ writel(readl(IFXMIPS_DMA_CCTRL) & ~1, IFXMIPS_DMA_CCTRL);
+ while (readl(IFXMIPS_DMA_CCTRL) & 1) {};
+ local_irq_restore (flag);
+
+ for (j = 0; j < pCh->desc_len; j++)
+ {
+ tx_desc_p = (struct tx_desc*)pCh->desc_base + j;
+ if ((tx_desc_p->status.field.OWN == CPU_OWN && tx_desc_p->status.field.C)
+ || (tx_desc_p->status.field.OWN == DMA_OWN && tx_desc_p->status.field.data_length > 0))
+ {
+ dev->buffer_free ((u8 *) __va (tx_desc_p->Data_Pointer), (void*)pCh->opt[j]);
+ }
+ tx_desc_p->status.field.OWN = CPU_OWN;
+ memset (tx_desc_p, 0, sizeof (struct tx_desc));
+ }
+ //TODO should free buffer that is not transferred by dma
+ }
+ }
+
+ for (i = 0; i < dev->max_rx_chan_num; i++)
+ {
+ pCh = dev->rx_chan[i];
+ chan_no = (int)(dev->rx_chan[i] - dma_chan);
+ disable_ifxmips_irq(pCh->irq);
+
+ local_irq_save(flag);
+ g_ifxmips_dma_int_status &= ~(1 << chan_no);
+ pCh->curr_desc = 0;
+ pCh->prev_desc = 0;
+ pCh->control = IFXMIPS_DMA_CH_OFF;
+
+ writel(chan_no, IFXMIPS_DMA_CS);
+ writel(0, IFXMIPS_DMA_CIE); /*fix me, should disable all the interrupts here? */
+ writel(readl(IFXMIPS_DMA_IRNEN) & ~(1 << chan_no), IFXMIPS_DMA_IRNEN); /*disable interrupts */
+ writel(readl(IFXMIPS_DMA_CCTRL) & ~1, IFXMIPS_DMA_CCTRL);
+ while (readl(IFXMIPS_DMA_CCTRL) & 1) {};
+
+ local_irq_restore (flag);
+ for (j = 0; j < pCh->desc_len; j++)
+ {
+ rx_desc_p = (struct rx_desc *) pCh->desc_base + j;
+ if ((rx_desc_p->status.field.OWN == CPU_OWN
+ && rx_desc_p->status.field.C)
+ || (rx_desc_p->status.field.OWN == DMA_OWN
+ && rx_desc_p->status.field.data_length > 0)) {
+ dev->buffer_free ((u8 *)
+ __va (rx_desc_p->
+ Data_Pointer),
+ (void *) pCh->opt[j]);
+ }
+ }
+ }
+}
+
+int
+dma_device_read (struct dma_device_info *dma_dev, u8 ** dataptr, void **opt)
+{
+ u8 *buf;
+ int len;
+ int byte_offset = 0;
+ void *p = NULL;
+ _dma_channel_info *pCh = dma_dev->rx_chan[dma_dev->current_rx_chan];
+ struct rx_desc *rx_desc_p;
+
+ /*get the rx data first */
+ rx_desc_p = (struct rx_desc *) pCh->desc_base + pCh->curr_desc;
+ if (!(rx_desc_p->status.field.OWN == CPU_OWN && rx_desc_p->status.field.C))
+ {
+ return 0;
+ }
+
+ buf = (u8 *) __va (rx_desc_p->Data_Pointer);
+ *(u32*)dataptr = (u32)buf;
+ len = rx_desc_p->status.field.data_length;
+
+ if (opt)
+ {
+ *(int*)opt = (int)pCh->opt[pCh->curr_desc];
+ }
+
+ /*replace with a new allocated buffer */
+ buf = dma_dev->buffer_alloc(pCh->packet_size, &byte_offset, &p);
+
+ if (buf)
+ {
+ dma_cache_inv ((unsigned long) buf,
+ pCh->packet_size);
+ pCh->opt[pCh->curr_desc] = p;
+ wmb ();
+
+ rx_desc_p->Data_Pointer = (u32) CPHYSADDR ((u32) buf);
+ rx_desc_p->status.word = (DMA_OWN << 31) | ((byte_offset) << 23) | pCh->packet_size;
+ wmb ();
+ } else {
+ *(u32 *) dataptr = 0;
+ if (opt)
+ *(int *) opt = 0;
+ len = 0;
+ }
+
+ /*increase the curr_desc pointer */
+ pCh->curr_desc++;
+ if (pCh->curr_desc == pCh->desc_len)
+ pCh->curr_desc = 0;
+
+ return len;
+}
+
+int
+dma_device_write (struct dma_device_info *dma_dev, u8 * dataptr, int len, void *opt)
+{
+ int flag;
+ u32 tmp, byte_offset;
+ _dma_channel_info *pCh;
+ int chan_no;
+ struct tx_desc *tx_desc_p;
+ local_irq_save (flag);
+
+ pCh = dma_dev->tx_chan[dma_dev->current_tx_chan];
+ chan_no = (int)(pCh - (_dma_channel_info *) dma_chan);
+
+ tx_desc_p = (struct tx_desc*)pCh->desc_base + pCh->prev_desc;
+ while (tx_desc_p->status.field.OWN == CPU_OWN && tx_desc_p->status.field.C)
+ {
+ dma_dev->buffer_free((u8 *) __va (tx_desc_p->Data_Pointer), pCh->opt[pCh->prev_desc]);
+ memset(tx_desc_p, 0, sizeof (struct tx_desc));
+ pCh->prev_desc = (pCh->prev_desc + 1) % (pCh->desc_len);
+ tx_desc_p = (struct tx_desc*)pCh->desc_base + pCh->prev_desc;
+ }
+ tx_desc_p = (struct tx_desc*)pCh->desc_base + pCh->curr_desc;
+ /*Check whether this descriptor is available */
+ if (tx_desc_p->status.field.OWN == DMA_OWN || tx_desc_p->status.field.C)
+ {
+ /*if not , the tell the upper layer device */
+ dma_dev->intr_handler (dma_dev, TX_BUF_FULL_INT);
+ local_irq_restore(flag);
+ printk (KERN_INFO "%s %d: failed to write!\n", __func__, __LINE__);
+
+ return 0;
+ }
+ pCh->opt[pCh->curr_desc] = opt;
+ /*byte offset----to adjust the starting address of the data buffer, should be multiple of the burst length. */
+ byte_offset = ((u32) CPHYSADDR ((u32) dataptr)) % ((dma_dev->tx_burst_len) * 4);
+ dma_cache_wback ((unsigned long) dataptr, len);
+ wmb ();
+ tx_desc_p->Data_Pointer = (u32) CPHYSADDR ((u32) dataptr) - byte_offset;
+ wmb ();
+ tx_desc_p->status.word = (DMA_OWN << 31) | DMA_DESC_SOP_SET | DMA_DESC_EOP_SET | ((byte_offset) << 23) | len;
+ wmb ();
+
+ pCh->curr_desc++;
+ if (pCh->curr_desc == pCh->desc_len)
+ pCh->curr_desc = 0;
+
+ /*Check whether this descriptor is available */
+ tx_desc_p = (struct tx_desc *) pCh->desc_base + pCh->curr_desc;
+ if (tx_desc_p->status.field.OWN == DMA_OWN)
+ {
+ /*if not , the tell the upper layer device */
+ dma_dev->intr_handler (dma_dev, TX_BUF_FULL_INT);
+ }
+
+ writel(chan_no, IFXMIPS_DMA_CS);
+ tmp = readl(IFXMIPS_DMA_CCTRL);
+
+ if (!(tmp & 1))
+ pCh->open (pCh);
+
+ local_irq_restore (flag);
+
+ return len;
+}
+
+int
+map_dma_chan(_dma_chan_map *map)
+{
+ int i, j;
+ int result;
+
+ for (i = 0; i < MAX_DMA_DEVICE_NUM; i++)
+ {
+ strcpy(dma_devs[i].device_name, global_device_name[i]);
+ }
+
+ for (i = 0; i < MAX_DMA_CHANNEL_NUM; i++)
+ {
+ dma_chan[i].irq = map[i].irq;
+ result = request_irq(dma_chan[i].irq, dma_interrupt, SA_INTERRUPT, "dma-core", (void*)&dma_chan[i]);
+ if (result)
+ {
+ printk("error, cannot get dma_irq!\n");
+ free_irq(dma_chan[i].irq, (void *) &dma_interrupt);
+
+ return -EFAULT;
+ }
+ }
+
+ for (i = 0; i < MAX_DMA_DEVICE_NUM; i++)
+ {
+ dma_devs[i].num_tx_chan = 0; /*set default tx channel number to be one */
+ dma_devs[i].num_rx_chan = 0; /*set default rx channel number to be one */
+ dma_devs[i].max_rx_chan_num = 0;
+ dma_devs[i].max_tx_chan_num = 0;
+ dma_devs[i].buffer_alloc = &common_buffer_alloc;
+ dma_devs[i].buffer_free = &common_buffer_free;
+ dma_devs[i].intr_handler = NULL;
+ dma_devs[i].tx_burst_len = 4;
+ dma_devs[i].rx_burst_len = 4;
+ if (i == 0)
+ {
+ writel(0, IFXMIPS_DMA_PS);
+ writel(readl(IFXMIPS_DMA_PCTRL) | ((0xf << 8) | (1 << 6)), IFXMIPS_DMA_PCTRL); /*enable dma drop */
+ }
+
+ if (i == 1)
+ {
+ writel(1, IFXMIPS_DMA_PS);
+ writel(0x14, IFXMIPS_DMA_PCTRL); /*deu port setting */
+ }
+
+ for (j = 0; j < MAX_DMA_CHANNEL_NUM; j++)
+ {
+ dma_chan[j].byte_offset = 0;
+ dma_chan[j].open = &open_chan;
+ dma_chan[j].close = &close_chan;
+ dma_chan[j].reset = &reset_chan;
+ dma_chan[j].enable_irq = &enable_ch_irq;
+ dma_chan[j].disable_irq = &disable_ch_irq;
+ dma_chan[j].rel_chan_no = map[j].rel_chan_no;
+ dma_chan[j].control = IFXMIPS_DMA_CH_OFF;
+ dma_chan[j].default_weight = IFXMIPS_DMA_CH_DEFAULT_WEIGHT;
+ dma_chan[j].weight = dma_chan[j].default_weight;
+ dma_chan[j].curr_desc = 0;
+ dma_chan[j].prev_desc = 0;
+ }
+
+ for (j = 0; j < MAX_DMA_CHANNEL_NUM; j++)
+ {
+ if (strcmp(dma_devs[i].device_name, map[j].dev_name) == 0)
+ {
+ if (map[j].dir == IFXMIPS_DMA_RX)
+ {
+ dma_chan[j].dir = IFXMIPS_DMA_RX;
+ dma_devs[i].max_rx_chan_num++;
+ dma_devs[i].rx_chan[dma_devs[i].max_rx_chan_num - 1] = &dma_chan[j];
+ dma_devs[i].rx_chan[dma_devs[i].max_rx_chan_num - 1]->pri = map[j].pri;
+ dma_chan[j].dma_dev = (void*)&dma_devs[i];
+ } else if(map[j].dir == IFXMIPS_DMA_TX)
+ { /*TX direction */
+ dma_chan[j].dir = IFXMIPS_DMA_TX;
+ dma_devs[i].max_tx_chan_num++;
+ dma_devs[i].tx_chan[dma_devs[i].max_tx_chan_num - 1] = &dma_chan[j];
+ dma_devs[i].tx_chan[dma_devs[i].max_tx_chan_num - 1]->pri = map[j].pri;
+ dma_chan[j].dma_dev = (void*)&dma_devs[i];
+ } else {
+ printk ("WRONG DMA MAP!\n");
+ }
+ }
+ }
+ }
+
+ return 0;
+}
+
+void
+dma_chip_init(void)
+{
+ int i;
+
+ // enable DMA from PMU
+ ifxmips_pmu_enable(IFXMIPS_PMU_PWDCR_DMA);
+
+ // reset DMA
+ writel(readl(IFXMIPS_DMA_CTRL) | 1, IFXMIPS_DMA_CTRL);
+
+ // diable all interrupts
+ writel(0, IFXMIPS_DMA_IRNEN);
+
+ for (i = 0; i < MAX_DMA_CHANNEL_NUM; i++)
+ {
+ writel(i, IFXMIPS_DMA_CS);
+ writel(0x2, IFXMIPS_DMA_CCTRL);
+ writel(0x80000040, IFXMIPS_DMA_CPOLL);
+ writel(readl(IFXMIPS_DMA_CCTRL) & ~0x1, IFXMIPS_DMA_CCTRL);
+
+ }
+}
+
+int
+ifxmips_dma_init (void)
+{
+ int i;
+
+ dma_chip_init();
+ if (map_dma_chan(default_dma_map))
+ BUG();
+
+ g_desc_list = (u64*)KSEG1ADDR(__get_free_page(GFP_DMA));
+
+ if (g_desc_list == NULL)
+ {
+ printk("no memory for desriptor\n");
+ return -ENOMEM;
+ }
+
+ memset(g_desc_list, 0, PAGE_SIZE);
+
+ for (i = 0; i < MAX_DMA_CHANNEL_NUM; i++)
+ {
+ dma_chan[i].desc_base = (u32)g_desc_list + i * IFXMIPS_DMA_DESCRIPTOR_OFFSET * 8;
+ dma_chan[i].curr_desc = 0;
+ dma_chan[i].desc_len = IFXMIPS_DMA_DESCRIPTOR_OFFSET;
+
+ writel(i, IFXMIPS_DMA_CS);
+ writel((u32)CPHYSADDR(dma_chan[i].desc_base), IFXMIPS_DMA_CDBA);
+ writel(dma_chan[i].desc_len, IFXMIPS_DMA_CDLEN);
+ }
+
+ return 0;
+}
+
+arch_initcall(ifxmips_dma_init);
+
+void
+dma_cleanup(void)
+{
+ int i;
+
+ free_page(KSEG0ADDR((unsigned long) g_desc_list));
+ for (i = 0; i < MAX_DMA_CHANNEL_NUM; i++)
+ free_irq(dma_chan[i].irq, (void*)&dma_interrupt);
+}
+
+EXPORT_SYMBOL (dma_device_reserve);
+EXPORT_SYMBOL (dma_device_release);
+EXPORT_SYMBOL (dma_device_register);
+EXPORT_SYMBOL (dma_device_unregister);
+EXPORT_SYMBOL (dma_device_read);
+EXPORT_SYMBOL (dma_device_write);
+
+MODULE_LICENSE ("GPL");
projects / openwrt / svn-archive / archive.git / commitdiff