From: Ben Gras Date: Mon, 19 Oct 2009 14:23:04 +0000 (+0000) Subject: - reverse order of transfer command and DMA initiation - fixes DMA problem X-Git-Tag: v3.1.5~12 X-Git-Url: http://zhaoyanbai.com/repos/man.dnssec-coverage.html?a=commitdiff_plain;h=0333f21d8e0a7572251576ed8da524e2fb89612c;p=minix.git - reverse order of transfer command and DMA initiation - fixes DMA problem that some hardware had - clear DMA_ST_INT after DMA - fixes infinite number of interrupts that some hardware had - initial ATAPI DMA implementation, doesn't actually increase performance on my test hardware so possibly not right yet, disabled by default --- diff --git a/drivers/at_wini/at_wini.c b/drivers/at_wini/at_wini.c index cb11f7c38..b9bb397ef 100644 --- a/drivers/at_wini/at_wini.c +++ b/drivers/at_wini/at_wini.c @@ -275,8 +275,8 @@ PRIVATE struct wini { /* main drive struct, one entry per drive */ unsigned base_cmd; /* command base register */ unsigned base_ctl; /* control base register */ unsigned base_dma; /* dma base register */ + int dma_intseen; unsigned irq; /* interrupt request line */ - unsigned irq_mask; /* 1 << irq */ unsigned irq_need_ack; /* irq needs to be acknowledged */ int irq_hook_id; /* id of irq hook at the kernel */ int lba48; /* supports lba48 */ @@ -585,7 +585,6 @@ PRIVATE void init_drive(struct wini *w, int base_cmd, int base_ctl, printf("at_wini%d: drive %d: base_cmd 0x%x, base_ctl 0x%x, base_dma 0x%x\n", w_instance, w-wini, w->base_cmd, w->base_ctl, w->base_dma); w->irq = irq; - w->irq_mask = 1 << irq; w->irq_need_ack = ack; w->irq_hook_id = hook; w->ldhpref = ldh_init(drive); @@ -1299,6 +1298,32 @@ PRIVATE int do_transfer(struct wini *wn, unsigned int precomp, return com_out(&cmd); } + +void stop_dma(struct wini *wn) +{ + int r; + + /* Stop bus master operation */ + r= sys_outb(wn->base_dma + DMA_COMMAND, 0); + if (r != 0) panic("at_wini", "setup_dma: sys_outb failed", r); +} + +void start_dma(struct wini *wn, int do_write) +{ + u32_t v; + int r; + + /* Assume disk reads. Start DMA */ + v= DMA_CMD_START; + if (!do_write) + { + /* Disk reads generate PCI write cycles. */ + v |= DMA_CMD_WRITE; + } + r= sys_outb(wn->base_dma + DMA_COMMAND, v); + if (r != 0) panic("at_wini", "setup_dma: sys_outb failed", r); +} + /*===========================================================================* * w_transfer * *===========================================================================*/ @@ -1353,6 +1378,8 @@ int safe; /* iov contains addresses (0) or grants? */ /* First check to see if a reinitialization is needed. */ if (!(wn->state & INITIALIZED) && w_specify() != OK) return(EIO); + stop_dma(wn); + if (do_dma) { setup_dma(&nbytes, proc_nr, iov, addr_offset, do_write, @@ -1366,6 +1393,8 @@ int safe; /* iov contains addresses (0) or grants? */ r = do_transfer(wn, wn->precomp, (nbytes >> SECTOR_SHIFT), block, opcode, do_dma); + start_dma(wn, do_write); + if (opcode == DEV_SCATTER_S) { /* The specs call for a 400 ns wait after issuing the command. * Reading the alternate status register is the suggested @@ -1381,6 +1410,7 @@ int safe; /* iov contains addresses (0) or grants? */ * copy out. */ + wn->dma_intseen = 0; if ((r = at_intr_wait()) != OK) { /* Don't retry if sector marked bad or too many @@ -1394,10 +1424,18 @@ int safe; /* iov contains addresses (0) or grants? */ } /* Wait for DMA_ST_INT to get set */ - w_waitfor_dma(DMA_ST_INT, DMA_ST_INT); + if(!wn->dma_intseen) { + if(w_waitfor_dma(DMA_ST_INT, DMA_ST_INT)) + wn->dma_intseen = 1; + } r= sys_inb(wn->base_dma + DMA_STATUS, &v); if (r != 0) panic("at_wini", "w_transfer: sys_inb failed", r); +#if 0 + if (sys_outb(wn->base_dma + DMA_STATUS, v) != OK) { + panic(w_name(), "couldn't ack irq on (out dma)\n", NO_NUM); + } +#endif #define BAD_DMA_CONTINUE(msg) { \ printf("at_wini%d: bad DMA: %s. Disabling DMA for drive %d.\n", \ @@ -1412,8 +1450,7 @@ int safe; /* iov contains addresses (0) or grants? */ #if 0 printf("dma_status: 0x%x\n", v); #endif - if (!(v & DMA_ST_INT)) - { + if (!wn->dma_intseen) { /* DMA did not complete successfully */ if (v & DMA_ST_BM_ACTIVE) { BAD_DMA_CONTINUE("DMA did not complete"); @@ -1427,6 +1464,8 @@ int safe; /* iov contains addresses (0) or grants? */ BAD_DMA_CONTINUE("DMA buffer too large"); } + stop_dma(wn); + dma_buf_offset= 0; while (r == OK && nbytes > 0) { @@ -1870,10 +1909,6 @@ int safe; #endif } - /* Stop bus master operation */ - r= sys_outb(wn->base_dma + DMA_COMMAND, 0); - if (r != 0) panic("at_wini", "setup_dma: sys_outb failed", r); - /* Verify that the bus master is not active */ r= sys_inb(wn->base_dma + DMA_STATUS, &v); if (r != 0) panic("at_wini", "setup_dma: sys_inb failed", r); @@ -1888,22 +1923,6 @@ int safe; /* Clear interrupt and error flags */ r= sys_outb(wn->base_dma + DMA_STATUS, DMA_ST_INT | DMA_ST_ERROR); if (r != 0) panic("at_wini", "setup_dma: sys_outb failed", r); - - /* Assume disk reads. Start DMA */ - v= DMA_CMD_START; - if (!do_write) - { - /* Disk reads generate PCI write cycles. */ - v |= DMA_CMD_WRITE; - } - r= sys_outb(wn->base_dma + DMA_COMMAND, v); - if (r != 0) panic("at_wini", "setup_dma: sys_outb failed", r); - -#if 0 - r= sys_inb(wn->base_dma + DMA_STATUS, &v); - if (r != 0) panic("at_wini", "setup_dma: sys_inb failed", r); - printf("dma status: 0x%x\n", v); -#endif } @@ -2575,9 +2594,9 @@ PRIVATE void ack_irqs(unsigned int irqs) unsigned int drive; unsigned long w_status; - for (drive = 0; drive < MAX_DRIVES && irqs; drive++) { + for (drive = 0; drive < MAX_DRIVES; drive++) { if (!(wini[drive].state & IGNORING) && wini[drive].irq_need_ack && - (wini[drive].irq_mask & irqs)) { + ((1L << wini[drive].irq) & irqs)) { if (sys_inb((wini[drive].base_cmd + REG_STATUS), &w_status) != OK) { @@ -2585,9 +2604,16 @@ PRIVATE void ack_irqs(unsigned int irqs) drive); } wini[drive].w_status= w_status; + sys_inb(wini[drive].base_dma + DMA_STATUS, &w_status); + if(w_status & DMA_ST_INT) { + sys_outb(wini[drive].base_dma + DMA_STATUS, DMA_ST_INT); + wini[drive].dma_intseen = 1; + } + if(w_status & DMA_ST_ERROR) { + printf("at_wini: DMA error\n"); + } if (sys_irqenable(&wini[drive].irq_hook_id) != OK) printf("couldn't re-enable drive %d\n", drive); - irqs &= ~wini[drive].irq_mask; } } }