diff options
author | Martin Fuzzey <mfuzzey@gmail.com> | 2010-09-30 22:21:59 (GMT) |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-10-22 17:22:03 (GMT) |
commit | d0cc3d4100e829d726d7c0fbf5b7b8d2146f60ba (patch) | |
tree | 94e3c28cc1e11448c74ed0f7be0a19af761f3c6d /drivers/usb/host | |
parent | 1dae423dd9b247b048eda00cb598c755e5933213 (diff) | |
download | linux-fsl-qoriq-d0cc3d4100e829d726d7c0fbf5b7b8d2146f60ba.tar.xz |
USB: imx21-hcd accept arbitary transfer buffer alignement.
The hardware can only do DMA to 4 byte aligned addresses.
When this requirement is not met use PIO or a bounce buffer.
PIO is used when the buffer is small enough to directly
use the hardware data memory (2*maxpacket).
A bounce buffer is used for larger transfers.
Signed-off-by: Martin Fuzzey <mfuzzey@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host')
-rw-r--r-- | drivers/usb/host/imx21-hcd.c | 196 | ||||
-rw-r--r-- | drivers/usb/host/imx21-hcd.h | 8 |
2 files changed, 169 insertions, 35 deletions
diff --git a/drivers/usb/host/imx21-hcd.c b/drivers/usb/host/imx21-hcd.c index 890a41c..dd132eb 100644 --- a/drivers/usb/host/imx21-hcd.c +++ b/drivers/usb/host/imx21-hcd.c @@ -57,6 +57,7 @@ #include <linux/slab.h> #include <linux/usb.h> #include <linux/usb/hcd.h> +#include <linux/dma-mapping.h> #include "imx21-hcd.h" @@ -136,9 +137,18 @@ static int imx21_hc_get_frame(struct usb_hcd *hcd) return wrap_frame(readl(imx21->regs + USBH_FRMNUB)); } +static inline bool unsuitable_for_dma(dma_addr_t addr) +{ + return (addr & 3) != 0; +} #include "imx21-dbg.c" +static void nonisoc_urb_completed_for_etd( + struct imx21 *imx21, struct etd_priv *etd, int status); +static void schedule_nonisoc_etd(struct imx21 *imx21, struct urb *urb); +static void free_dmem(struct imx21 *imx21, struct etd_priv *etd); + /* =========================================== */ /* ETD management */ /* =========================================== */ @@ -185,7 +195,8 @@ static void reset_etd(struct imx21 *imx21, int num) etd_writel(imx21, num, i, 0); etd->urb = NULL; etd->ep = NULL; - etd->td = NULL;; + etd->td = NULL; + etd->bounce_buffer = NULL; } static void free_etd(struct imx21 *imx21, int num) @@ -221,26 +232,94 @@ static void setup_etd_dword0(struct imx21 *imx21, ((u32) maxpacket << DW0_MAXPKTSIZ)); } -static void activate_etd(struct imx21 *imx21, - int etd_num, dma_addr_t dma, u8 dir) +/** + * Copy buffer to data controller data memory. + * We cannot use memcpy_toio() because the hardware requires 32bit writes + */ +static void copy_to_dmem( + struct imx21 *imx21, int dmem_offset, void *src, int count) +{ + void __iomem *dmem = imx21->regs + USBOTG_DMEM + dmem_offset; + u32 word = 0; + u8 *p = src; + int byte = 0; + int i; + + for (i = 0; i < count; i++) { + byte = i % 4; + word += (*p++ << (byte * 8)); + if (byte == 3) { + writel(word, dmem); + dmem += 4; + word = 0; + } + } + + if (count && byte != 3) + writel(word, dmem); +} + +static void activate_etd(struct imx21 *imx21, int etd_num, u8 dir) { u32 etd_mask = 1 << etd_num; struct etd_priv *etd = &imx21->etd[etd_num]; + if (etd->dma_handle && unsuitable_for_dma(etd->dma_handle)) { + /* For non aligned isoc the condition below is always true */ + if (etd->len <= etd->dmem_size) { + /* Fits into data memory, use PIO */ + if (dir != TD_DIR_IN) { + copy_to_dmem(imx21, + etd->dmem_offset, + etd->cpu_buffer, etd->len); + } + etd->dma_handle = 0; + + } else { + /* Too big for data memory, use bounce buffer */ + enum dma_data_direction dmadir; + + if (dir == TD_DIR_IN) { + dmadir = DMA_FROM_DEVICE; + etd->bounce_buffer = kmalloc(etd->len, + GFP_ATOMIC); + } else { + dmadir = DMA_TO_DEVICE; + etd->bounce_buffer = kmemdup(etd->cpu_buffer, + etd->len, + GFP_ATOMIC); + } + if (!etd->bounce_buffer) { + dev_err(imx21->dev, "failed bounce alloc\n"); + goto err_bounce_alloc; + } + + etd->dma_handle = + dma_map_single(imx21->dev, + etd->bounce_buffer, + etd->len, + dmadir); + if (dma_mapping_error(imx21->dev, etd->dma_handle)) { + dev_err(imx21->dev, "failed bounce map\n"); + goto err_bounce_map; + } + } + } + clear_toggle_bit(imx21, USBH_ETDDONESTAT, etd_mask); set_register_bits(imx21, USBH_ETDDONEEN, etd_mask); clear_toggle_bit(imx21, USBH_XFILLSTAT, etd_mask); clear_toggle_bit(imx21, USBH_YFILLSTAT, etd_mask); - if (dma) { + if (etd->dma_handle) { set_register_bits(imx21, USB_ETDDMACHANLCLR, etd_mask); clear_toggle_bit(imx21, USBH_XBUFSTAT, etd_mask); clear_toggle_bit(imx21, USBH_YBUFSTAT, etd_mask); - writel(dma, imx21->regs + USB_ETDSMSA(etd_num)); + writel(etd->dma_handle, imx21->regs + USB_ETDSMSA(etd_num)); set_register_bits(imx21, USB_ETDDMAEN, etd_mask); } else { if (dir != TD_DIR_IN) { - /* need to set for ZLP */ + /* need to set for ZLP and PIO */ set_toggle_bit(imx21, USBH_XFILLSTAT, etd_mask); set_toggle_bit(imx21, USBH_YFILLSTAT, etd_mask); } @@ -263,6 +342,14 @@ static void activate_etd(struct imx21 *imx21, etd->active_count = 1; writel(etd_mask, imx21->regs + USBH_ETDENSET); + return; + +err_bounce_map: + kfree(etd->bounce_buffer); + +err_bounce_alloc: + free_dmem(imx21, etd); + nonisoc_urb_completed_for_etd(imx21, etd, -ENOMEM); } /* =========================================== */ @@ -325,7 +412,7 @@ static void activate_queued_etd(struct imx21 *imx21, etd->dmem_offset = dmem_offset; urb_priv->active = 1; - activate_etd(imx21, etd_num, etd->dma_handle, dir); + activate_etd(imx21, etd_num, dir); } static void free_dmem(struct imx21 *imx21, struct etd_priv *etd) @@ -385,7 +472,6 @@ static void free_epdmem(struct imx21 *imx21, struct usb_host_endpoint *ep) /* =========================================== */ /* End handling */ /* =========================================== */ -static void schedule_nonisoc_etd(struct imx21 *imx21, struct urb *urb); /* Endpoint now idle - release it's ETD(s) or asssign to queued request */ static void ep_idle(struct imx21 *imx21, struct ep_priv *ep_priv) @@ -448,6 +534,24 @@ __acquires(imx21->lock) ep_idle(imx21, ep_priv); } +static void nonisoc_urb_completed_for_etd( + struct imx21 *imx21, struct etd_priv *etd, int status) +{ + struct usb_host_endpoint *ep = etd->ep; + + urb_done(imx21->hcd, etd->urb, status); + etd->urb = NULL; + + if (!list_empty(&ep->urb_list)) { + struct urb *urb = list_first_entry( + &ep->urb_list, struct urb, urb_list); + + dev_vdbg(imx21->dev, "next URB %p\n", urb); + schedule_nonisoc_etd(imx21, urb); + } +} + + /* =========================================== */ /* ISOC Handling ... */ /* =========================================== */ @@ -500,6 +604,8 @@ too_late: etd->ep = td->ep; etd->urb = td->urb; etd->len = td->len; + etd->dma_handle = td->dma_handle; + etd->cpu_buffer = td->cpu_buffer; debug_isoc_submitted(imx21, cur_frame, td); @@ -513,16 +619,17 @@ too_late: (TD_NOTACCESSED << DW3_COMPCODE0) | (td->len << DW3_PKTLEN0)); - activate_etd(imx21, etd_num, td->data, dir); + activate_etd(imx21, etd_num, dir); } } -static void isoc_etd_done(struct usb_hcd *hcd, struct urb *urb, int etd_num) +static void isoc_etd_done(struct usb_hcd *hcd, int etd_num) { struct imx21 *imx21 = hcd_to_imx21(hcd); int etd_mask = 1 << etd_num; - struct urb_priv *urb_priv = urb->hcpriv; struct etd_priv *etd = imx21->etd + etd_num; + struct urb *urb = etd->urb; + struct urb_priv *urb_priv = urb->hcpriv; struct td *td = etd->td; struct usb_host_endpoint *ep = etd->ep; int isoc_index = td->isoc_index; @@ -556,8 +663,13 @@ static void isoc_etd_done(struct usb_hcd *hcd, struct urb *urb, int etd_num) bytes_xfrd, td->len, urb, etd_num, isoc_index); } - if (dir_in) + if (dir_in) { clear_toggle_bit(imx21, USBH_XFILLSTAT, etd_mask); + if (!etd->dma_handle) + memcpy_fromio(etd->cpu_buffer, + imx21->regs + USBOTG_DMEM + etd->dmem_offset, + bytes_xfrd); + } urb->actual_length += bytes_xfrd; urb->iso_frame_desc[isoc_index].actual_length = bytes_xfrd; @@ -716,12 +828,14 @@ static int imx21_hc_urb_enqueue_isoc(struct usb_hcd *hcd, /* set up transfers */ td = urb_priv->isoc_td; for (i = 0; i < urb->number_of_packets; i++, td++) { + unsigned int offset = urb->iso_frame_desc[i].offset; td->ep = ep; td->urb = urb; td->len = urb->iso_frame_desc[i].length; td->isoc_index = i; td->frame = wrap_frame(urb->start_frame + urb->interval * i); - td->data = urb->transfer_dma + urb->iso_frame_desc[i].offset; + td->dma_handle = urb->transfer_dma + offset; + td->cpu_buffer = urb->transfer_buffer + offset; list_add_tail(&td->list, &ep_priv->td_list); } @@ -812,13 +926,15 @@ static void schedule_nonisoc_etd(struct imx21 *imx21, struct urb *urb) if (usb_pipecontrol(pipe) && (state != US_CTRL_DATA)) { if (state == US_CTRL_SETUP) { dir = TD_DIR_SETUP; + if (unsuitable_for_dma(urb->setup_dma)) + unmap_urb_setup_for_dma(imx21->hcd, urb); etd->dma_handle = urb->setup_dma; + etd->cpu_buffer = urb->setup_packet; bufround = 0; count = 8; datatoggle = TD_TOGGLE_DATA0; } else { /* US_CTRL_ACK */ dir = usb_pipeout(pipe) ? TD_DIR_IN : TD_DIR_OUT; - etd->dma_handle = urb->transfer_dma; bufround = 0; count = 0; datatoggle = TD_TOGGLE_DATA1; @@ -826,7 +942,11 @@ static void schedule_nonisoc_etd(struct imx21 *imx21, struct urb *urb) } else { dir = usb_pipeout(pipe) ? TD_DIR_OUT : TD_DIR_IN; bufround = (dir == TD_DIR_IN) ? 1 : 0; + if (unsuitable_for_dma(urb->transfer_dma)) + unmap_urb_for_dma(imx21->hcd, urb); + etd->dma_handle = urb->transfer_dma; + etd->cpu_buffer = urb->transfer_buffer; if (usb_pipebulk(pipe) && (state == US_BULK0)) count = 0; else @@ -901,14 +1021,15 @@ static void schedule_nonisoc_etd(struct imx21 *imx21, struct urb *urb) /* enable the ETD to kick off transfer */ dev_vdbg(imx21->dev, "Activating etd %d for %d bytes %s\n", etd_num, count, dir != TD_DIR_IN ? "out" : "in"); - activate_etd(imx21, etd_num, etd->dma_handle, dir); + activate_etd(imx21, etd_num, dir); } -static void nonisoc_etd_done(struct usb_hcd *hcd, struct urb *urb, int etd_num) +static void nonisoc_etd_done(struct usb_hcd *hcd, int etd_num) { struct imx21 *imx21 = hcd_to_imx21(hcd); struct etd_priv *etd = &imx21->etd[etd_num]; + struct urb *urb = etd->urb; u32 etd_mask = 1 << etd_num; struct urb_priv *urb_priv = urb->hcpriv; int dir; @@ -930,7 +1051,20 @@ static void nonisoc_etd_done(struct usb_hcd *hcd, struct urb *urb, int etd_num) if (dir == TD_DIR_IN) { clear_toggle_bit(imx21, USBH_XFILLSTAT, etd_mask); clear_toggle_bit(imx21, USBH_YFILLSTAT, etd_mask); + + if (etd->bounce_buffer) { + memcpy(etd->cpu_buffer, etd->bounce_buffer, bytes_xfrd); + dma_unmap_single(imx21->dev, + etd->dma_handle, etd->len, DMA_FROM_DEVICE); + } else if (!etd->dma_handle && bytes_xfrd) {/* PIO */ + memcpy_fromio(etd->cpu_buffer, + imx21->regs + USBOTG_DMEM + etd->dmem_offset, + bytes_xfrd); + } } + + kfree(etd->bounce_buffer); + etd->bounce_buffer = NULL; free_dmem(imx21, etd); urb->error_count = 0; @@ -988,24 +1122,15 @@ static void nonisoc_etd_done(struct usb_hcd *hcd, struct urb *urb, int etd_num) break; } - if (!etd_done) { + if (etd_done) + nonisoc_urb_completed_for_etd(imx21, etd, cc_to_error[cc]); + else { dev_vdbg(imx21->dev, "next state=%d\n", urb_priv->state); schedule_nonisoc_etd(imx21, urb); - } else { - struct usb_host_endpoint *ep = urb->ep; - - urb_done(hcd, urb, cc_to_error[cc]); - etd->urb = NULL; - - if (!list_empty(&ep->urb_list)) { - urb = list_first_entry(&ep->urb_list, - struct urb, urb_list); - dev_vdbg(imx21->dev, "next URB %p\n", urb); - schedule_nonisoc_etd(imx21, urb); - } } } + static struct ep_priv *alloc_ep(void) { int i; @@ -1146,9 +1271,13 @@ static int imx21_hc_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, } else if (urb_priv->active) { int etd_num = ep_priv->etd[0]; if (etd_num != -1) { + struct etd_priv *etd = &imx21->etd[etd_num]; + disactivate_etd(imx21, etd_num); - free_dmem(imx21, &imx21->etd[etd_num]); - imx21->etd[etd_num].urb = NULL; + free_dmem(imx21, etd); + etd->urb = NULL; + kfree(etd->bounce_buffer); + etd->bounce_buffer = NULL; } } @@ -1248,9 +1377,9 @@ static void process_etds(struct usb_hcd *hcd, struct imx21 *imx21, int sof) } if (usb_pipeisoc(etd->urb->pipe)) - isoc_etd_done(hcd, etd->urb, etd_num); + isoc_etd_done(hcd, etd_num); else - nonisoc_etd_done(hcd, etd->urb, etd_num); + nonisoc_etd_done(hcd, etd_num); } /* only enable SOF interrupt if it may be needed for the kludge */ @@ -1718,6 +1847,7 @@ static int imx21_probe(struct platform_device *pdev) } imx21 = hcd_to_imx21(hcd); + imx21->hcd = hcd; imx21->dev = &pdev->dev; imx21->pdata = pdev->dev.platform_data; if (!imx21->pdata) diff --git a/drivers/usb/host/imx21-hcd.h b/drivers/usb/host/imx21-hcd.h index 1b0d913..87b29fd 100644 --- a/drivers/usb/host/imx21-hcd.h +++ b/drivers/usb/host/imx21-hcd.h @@ -250,6 +250,7 @@ #define USBCTRL_USB_BYP (1 << 2) #define USBCTRL_HOST1_TXEN_OE (1 << 1) +#define USBOTG_DMEM 0x1000 /* Values in TD blocks */ #define TD_DIR_SETUP 0 @@ -346,8 +347,8 @@ struct td { struct list_head list; struct urb *urb; struct usb_host_endpoint *ep; - dma_addr_t data; - unsigned long buf_addr; + dma_addr_t dma_handle; + void *cpu_buffer; int len; int frame; int isoc_index; @@ -360,6 +361,8 @@ struct etd_priv { struct td *td; struct list_head queue; dma_addr_t dma_handle; + void *cpu_buffer; + void *bounce_buffer; int alloc; int len; int dmem_size; @@ -412,6 +415,7 @@ struct debug_isoc_trace { struct imx21 { spinlock_t lock; struct device *dev; + struct usb_hcd *hcd; struct mx21_usbh_platform_data *pdata; struct list_head dmem_list; struct list_head queue_for_etd; /* eps queued due to etd shortage */ |