* published by the Free Software Foundation.
*/
+#define DEBUG
+
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/spinlock.h>
* For periodic IN endpoints, we have fifo_size and fifo_load to try
* and keep track of the amount of data in the periodic FIFO for each
* of these as we don't have a status register that tells us how much
- * is in each of them.
+ * is in each of them. (note, this may actually be useless information
+ * as in shared-fifo mode periodic in acts like a single-frame packet
+ * buffer than a fifo)
*/
struct s3c_hsotg_ep {
struct usb_ep ep;
* @regs: The memory area mapped for accessing registers.
* @regs_res: The resource that was allocated when claiming register space.
* @irq: The IRQ number we are using
+ * @dedicated_fifos: Set if the hardware has dedicated IN-EP fifos.
* @debug_root: root directrory for debugfs.
* @debug_file: main status file for debugfs.
* @debug_fifo: FIFO status file for debugfs.
struct resource *regs_res;
int irq;
+ unsigned int dedicated_fifos:1;
+
struct dentry *debug_root;
struct dentry *debug_file;
struct dentry *debug_fifo;
unsigned int ep;
unsigned int addr;
unsigned int size;
+ int timeout;
u32 val;
/* the ryu 2.6.24 release ahs
hsotg->regs + S3C_GNPTXFSIZ);
*/
- /* set FIFO sizes to 2048/0x1C0 */
+ /* set FIFO sizes to 2048/1024 */
writel(2048, hsotg->regs + S3C_GRXFSIZ);
writel(S3C_GNPTXFSIZ_NPTxFStAddr(2048) |
- S3C_GNPTXFSIZ_NPTxFDep(0x1C0),
+ S3C_GNPTXFSIZ_NPTxFDep(1024),
hsotg->regs + S3C_GNPTXFSIZ);
/* arange all the rest of the TX FIFOs, as some versions of this
writel(val, hsotg->regs + S3C_DPTXFSIZn(ep));
}
+
+ /* according to p428 of the design guide, we need to ensure that
+ * all fifos are flushed before continuing */
+
+ writel(S3C_GRSTCTL_TxFNum(0x10) | S3C_GRSTCTL_TxFFlsh |
+ S3C_GRSTCTL_RxFFlsh, hsotg->regs + S3C_GRSTCTL);
+
+ /* wait until the fifos are both flushed */
+ timeout = 100;
+ while (1) {
+ val = readl(hsotg->regs + S3C_GRSTCTL);
+
+ if ((val & (S3C_GRSTCTL_TxFFlsh | S3C_GRSTCTL_RxFFlsh)) == 0)
+ break;
+
+ if (--timeout == 0) {
+ dev_err(hsotg->dev,
+ "%s: timeout flushing fifos (GRSTCTL=%08x)\n",
+ __func__, val);
+ }
+
+ udelay(1);
+ }
+
+ dev_dbg(hsotg->dev, "FIFOs reset, timeout at %d\n", timeout);
}
/**
if (to_write == 0)
return 0;
- if (periodic) {
+ if (periodic && !hsotg->dedicated_fifos) {
u32 epsize = readl(hsotg->regs + S3C_DIEPTSIZ(hs_ep->index));
int size_left;
int size_done;
size_left = S3C_DxEPTSIZ_XferSize_GET(epsize);
+ /* if shared fifo, we cannot write anything until the
+ * previous data has been completely sent.
+ */
+ if (hs_ep->fifo_load != 0) {
+ s3c_hsotg_en_gsint(hsotg, S3C_GINTSTS_PTxFEmp);
+ return -ENOSPC;
+ }
+
dev_dbg(hsotg->dev, "%s: left=%d, load=%d, fifo=%d, size %d\n",
__func__, size_left,
hs_ep->size_loaded, hs_ep->fifo_load, hs_ep->fifo_size);
s3c_hsotg_en_gsint(hsotg, S3C_GINTSTS_PTxFEmp);
return -ENOSPC;
}
+ } else if (hsotg->dedicated_fifos && hs_ep->index != 0) {
+ can_write = readl(hsotg->regs + S3C_DTXFSTS(hs_ep->index));
+
+ can_write &= 0xffff;
+ can_write *= 4;
} else {
if (S3C_GNPTXSTS_NPTxQSpcAvail_GET(gnptxsts) == 0) {
dev_dbg(hsotg->dev,
}
can_write = S3C_GNPTXSTS_NPTxFSpcAvail_GET(gnptxsts);
+ can_write *= 4; /* fifo size is in 32bit quantities. */
}
dev_dbg(hsotg->dev, "%s: GNPTXSTS=%08x, can=%d, to=%d, mps %d\n",
if (can_write > 512)
can_write = 512;
+ /* limit the write to one max-packet size worth of data, but allow
+ * the transfer to return that it did not run out of fifo space
+ * doing it. */
+ if (to_write > hs_ep->ep.maxpacket) {
+ to_write = hs_ep->ep.maxpacket;
+
+ s3c_hsotg_en_gsint(hsotg,
+ periodic ? S3C_GINTSTS_PTxFEmp :
+ S3C_GINTSTS_NPTxFEmp);
+ }
+
/* see if we can write data */
if (to_write > can_write) {
maxsize = S3C_DxEPTSIZ_XferSize_LIMIT + 1;
maxpkt = S3C_DxEPTSIZ_PktCnt_LIMIT + 1;
} else {
+ maxsize = 64+64;
if (hs_ep->dir_in) {
- /* maxsize = S3C_DIEPTSIZ0_XferSize_LIMIT + 1; */
- maxsize = 64+64+1;
maxpkt = S3C_DIEPTSIZ0_PktCnt_LIMIT + 1;
} else {
- maxsize = 0x3f;
maxpkt = 2;
}
}
if (dir_in) {
s3c_hsotg_complete_in(hsotg, hs_ep);
- if (idx == 0)
+ if (idx == 0 && !hs_ep->req)
s3c_hsotg_enqueue_setup(hsotg);
} else if (using_dma(hsotg)) {
/* We're using DMA, we need to fire an OutDone here
__func__, idx);
clear |= S3C_DIEPMSK_INTknEPMisMsk;
}
+
+ /* FIFO has space or is empty (see GAHBCFG) */
+ if (hsotg->dedicated_fifos &&
+ ints & S3C_DIEPMSK_TxFIFOEmpty) {
+ dev_dbg(hsotg->dev, "%s: ep%d: TxFIFOEmpty\n",
+ __func__, idx);
+ s3c_hsotg_trytx(hsotg, hs_ep);
+ clear |= S3C_DIEPMSK_TxFIFOEmpty;
+ }
}
writel(clear, hsotg->regs + epint_reg);
kill_all_requests(hsotg, &hsotg->eps[0], -ECONNRESET, true);
/* it seems after a reset we can end up with a situation
- * where the TXFIFO still has data in it... try flushing
- * it to remove anything that may still be in it.
+ * where the TXFIFO still has data in it... the docs
+ * suggest resetting all the fifos, so use the init_fifo
+ * code to relayout and flush the fifos.
*/
- if (1) {
- writel(S3C_GRSTCTL_TxFNum(0) | S3C_GRSTCTL_TxFFlsh,
- hsotg->regs + S3C_GRSTCTL);
-
- dev_info(hsotg->dev, "GNPTXSTS=%08x\n",
- readl(hsotg->regs + S3C_GNPTXSTS));
- }
+ s3c_hsotg_init_fifo(hsotg);
s3c_hsotg_enqueue_setup(hsotg);
break;
}
+ /* if the hardware has dedicated fifos, we must give each IN EP
+ * a unique tx-fifo even if it is non-periodic.
+ */
+ if (dir_in && hsotg->dedicated_fifos)
+ epctrl |= S3C_DxEPCTL_TxFNum(index);
+
/* for non control endpoints, set PID to D0 */
if (index)
epctrl |= S3C_DxEPCTL_SetD0PID;
writel(S3C_DIEPMSK_TimeOUTMsk | S3C_DIEPMSK_AHBErrMsk |
S3C_DIEPMSK_INTknEPMisMsk |
- S3C_DIEPMSK_EPDisbldMsk | S3C_DIEPMSK_XferComplMsk,
+ S3C_DIEPMSK_EPDisbldMsk | S3C_DIEPMSK_XferComplMsk |
+ ((hsotg->dedicated_fifos) ? S3C_DIEPMSK_TxFIFOEmpty : 0),
hsotg->regs + S3C_DIEPMSK);
/* don't need XferCompl, we get that from RXFIFO in slave mode. In
*/
ptxfifo = readl(hsotg->regs + S3C_DPTXFSIZn(epnum));
- hs_ep->fifo_size = S3C_DPTXFSIZn_DPTxFSize_GET(ptxfifo);
+ hs_ep->fifo_size = S3C_DPTXFSIZn_DPTxFSize_GET(ptxfifo) * 4;
/* if we're using dma, we need to set the next-endpoint pointer
* to be something valid.
static void s3c_hsotg_init(struct s3c_hsotg *hsotg)
{
+ u32 cfg4;
+
/* unmask subset of endpoint interrupts */
writel(S3C_DIEPMSK_TimeOUTMsk | S3C_DIEPMSK_AHBErrMsk |
writel(using_dma(hsotg) ? S3C_GAHBCFG_DMAEn : 0x0,
hsotg->regs + S3C_GAHBCFG);
+
+ /* check hardware configuration */
+
+ cfg4 = readl(hsotg->regs + 0x50);
+ hsotg->dedicated_fifos = (cfg4 >> 25) & 1;
+
+ dev_info(hsotg->dev, "%s fifos\n",
+ hsotg->dedicated_fifos ? "dedicated" : "shared");
}
static void s3c_hsotg_dump(struct s3c_hsotg *hsotg)
git://bbs.cooldavid.org / net-next-2.6.git / blobdiff