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rockbox/firmware/target/arm/as3525/usb-drv-as3525.c

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright © 2010 Tobias Diedrich
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "system.h"
#include "usb.h"
#include "usb_drv.h"
#include "as3525.h"
#include "clock-target.h"
#include "ascodec.h"
#include "as3514.h"
#include <stdbool.h>
#include "panic.h"
/*#define LOGF_ENABLE*/
#include "logf.h"
#include "usb_ch9.h"
#include "usb_core.h"
#include "string.h"
#include "usb-drv-as3525.h"
static struct usb_endpoint endpoints[USB_NUM_EPS][2];
static int got_set_configuration = 0;
static int usb_enum_timeout = -1;
static bool initialized = false;
/*
* dma/setup descriptors and buffers should avoid sharing
* a cacheline with other data.
* dmadescs may share with each other, since we only access them uncached.
*/
static struct usb_dev_dma_desc dmadescs[USB_NUM_EPS][2] __attribute__((aligned(32)));
/* reuse unused EP2 OUT descriptor here */
static struct usb_dev_setup_buf *setup_desc = (void*)&dmadescs[2][1];
#if AS3525_MCLK_SEL != AS3525_CLK_PLLB
static inline void usb_enable_pll(void)
{
CGU_COUNTB = CGU_LOCK_CNT;
CGU_PLLB = AS3525_PLLB_SETTING;
CGU_PLLBSUP = 0; /* enable PLLB */
while(!(CGU_INTCTRL & CGU_PLLB_LOCK)); /* wait until PLLB is locked */
}
static inline void usb_disable_pll(void)
{
CGU_PLLBSUP = CGU_PLL_POWERDOWN;
}
#else
static inline void usb_enable_pll(void)
{
}
static inline void usb_disable_pll(void)
{
}
#endif /* AS3525_MCLK_SEL != AS3525_CLK_PLLB */
void usb_attach(void)
{
logf("usb-drv: attach");
/* Nothing to do */
}
static void usb_tick(void);
static void usb_phy_on(void)
{
/* PHY clock */
CGU_USB = 1<<5 /* enable */
| (CLK_DIV(AS3525_PLLB_FREQ, 48000000) / 2) << 2
| 2; /* source = PLLB */
/* UVDD on */
ascodec_write(AS3515_USB_UTIL, ascodec_read(AS3515_USB_UTIL) | (1<<4));
mdelay(100);
/* reset */
CCU_SRC = CCU_SRC_USB_AHB_EN|CCU_SRC_USB_PHY_EN;
CCU_SRL = CCU_SRL_MAGIC_NUMBER;
mdelay(1);
CCU_SRC = CCU_SRC_USB_AHB_EN;
mdelay(1);
CCU_SRC = CCU_SRL = 0;
USB_GPIO_CSR = USB_GPIO_TX_ENABLE_N
| USB_GPIO_TX_BIT_STUFF_EN
| USB_GPIO_XO_ON
| USB_GPIO_CLK_SEL10; /* 0x06180000; */
}
static void usb_phy_suspend(void)
{
USB_GPIO_CSR |= USB_GPIO_ASESSVLD_EXT |
USB_GPIO_BSESSVLD_EXT |
USB_GPIO_VBUS_VLD_EXT;
mdelay(3);
USB_GPIO_CSR |= USB_GPIO_VBUS_VLD_EXT_SEL;
mdelay(10);
}
static void usb_phy_resume(void)
{
USB_GPIO_CSR &= ~(USB_GPIO_ASESSVLD_EXT |
USB_GPIO_BSESSVLD_EXT |
USB_GPIO_VBUS_VLD_EXT);
mdelay(3);
USB_GPIO_CSR &= ~USB_GPIO_VBUS_VLD_EXT_SEL;
mdelay(10);
}
static void setup_desc_init(struct usb_dev_setup_buf *desc)
{
struct usb_dev_setup_buf *uc_desc = AS3525_UNCACHED_ADDR(desc);
uc_desc->status = USB_DMA_DESC_BS_HST_RDY;
uc_desc->resv = 0xffffffff;
uc_desc->data1 = 0xffffffff;
uc_desc->data2 = 0xffffffff;
}
static void dma_desc_init(int ep, int dir)
{
struct usb_dev_dma_desc *desc = &dmadescs[ep][dir];
struct usb_dev_dma_desc *uc_desc = AS3525_UNCACHED_ADDR(desc);
endpoints[ep][dir].uc_desc = uc_desc;
uc_desc->status = USB_DMA_DESC_BS_DMA_DONE | \
USB_DMA_DESC_LAST | \
USB_DMA_DESC_ZERO_LEN;
uc_desc->resv = 0xffffffff;
uc_desc->data_ptr = 0;
uc_desc->next_desc = 0;
}
static void reset_endpoints(int init)
{
int i;
/*
* OUT EP 2 is an alias for OUT EP 0 on this HW!
*
* Resonates with "3 bidirectional- plus 1 in-endpoints in device mode"
* from the datasheet, but why ep2 and not ep3?
*
* Reserve it here so we will skip over it in request_endpoint().
*/
endpoints[2][1].state |= EP_STATE_ALLOCATED;
for(i = 0; i < USB_NUM_EPS; i++) {
/*
* MPS sizes depending on speed:
* LS: 8 (control), no bulk available
* FS: 64 (control), 64 (bulk)
* HS: 64 (control), 512 (bulk)
*
* We don't need to handle LS since there is no low-speed only
* host AFAIK.
*/
int mps = i == 0 ? 64 : (usb_drv_port_speed() ? 512 : 64);
if (init) {
if (endpoints[i][0].state & EP_STATE_BUSY) {
if (endpoints[i][0].state & EP_STATE_ASYNC) {
endpoints[i][0].rc = -1;
semaphore_release(&endpoints[i][0].complete);
} else {
usb_core_transfer_complete(i, USB_DIR_IN, -1, 0);
}
}
endpoints[i][0].state = 0;
semaphore_wait(&endpoints[i][0].complete, TIMEOUT_NOBLOCK);
if (i != 2) { /* Skip the OUT EP0 alias */
if (endpoints[i][1].state & EP_STATE_BUSY)
usb_core_transfer_complete(i, USB_DIR_OUT, -1, 0);
endpoints[i][1].state = 0;
semaphore_wait(&endpoints[i][1].complete, TIMEOUT_NOBLOCK);
USB_OEP_SUP_PTR(i) = 0;
}
}
dma_desc_init(i, 0);
USB_IEP_CTRL (i) = USB_EP_CTRL_FLUSH|USB_EP_CTRL_SNAK;
USB_IEP_MPS (i) = mps; /* in bytes */
/* We don't care about the 'IN token received' event */
USB_IEP_STS_MASK(i) = USB_EP_STAT_IN; /* OF: 0x840 */
USB_IEP_TXFSIZE (i) = mps/2; /* in dwords => mps*2 bytes */
USB_IEP_STS (i) = 0xffffffff; /* clear status */
USB_IEP_DESC_PTR(i) = 0;
if (i != 2) { /* Skip the OUT EP0 alias */
dma_desc_init(i, 1);
USB_OEP_CTRL (i) = USB_EP_CTRL_FLUSH|USB_EP_CTRL_SNAK;
USB_OEP_MPS (i) = (mps/2 << 16) | mps;
USB_OEP_STS_MASK(i) = USB_EP_STAT_BNA; /* OF: 0x1800 */
USB_OEP_RXFR (i) = 0; /* Always 0 in OF trace? */
USB_OEP_STS (i) = 0xffffffff; /* clear status */
USB_OEP_DESC_PTR(i) = 0;
}
}
setup_desc_init(setup_desc);
USB_OEP_SUP_PTR(0) = AS3525_PHYSICAL_ADDR((int)setup_desc);
}
void usb_drv_init(void)
{
logf("usb_drv_init() !!!!\n");
if (!initialized)
{
int i;
for (i = 0; i < USB_NUM_EPS; i++)
{
semaphore_init(&endpoints[i][0].complete, 1, 0);
semaphore_init(&endpoints[i][1].complete, 1, 0);
}
initialized = true;
}
usb_enable_pll();
/* we have external power, so boost cpu */
cpu_boost(1);
/* length regulator: normal operation */
ascodec_write(AS3514_CVDD_DCDC3, ascodec_read(AS3514_CVDD_DCDC3) | 1<<2);
/* AHB part */
bitset32(&CGU_PERI, CGU_USB_CLOCK_ENABLE);
/* reset AHB */
CCU_SRC = CCU_SRC_USB_AHB_EN;
CCU_SRL = CCU_SRL_MAGIC_NUMBER;
mdelay(1);
CCU_SRC = CCU_SRL = 0;
USB_GPIO_CSR = USB_GPIO_TX_ENABLE_N
| USB_GPIO_TX_BIT_STUFF_EN
| USB_GPIO_XO_ON
| USB_GPIO_CLK_SEL10; /* 0x06180000; */
/* bug workaround according to linux patch */
USB_DEV_CFG = (USB_DEV_CFG & ~3) | 1; /* full speed */
/* enable soft disconnect */
USB_DEV_CTRL |= USB_DEV_CTRL_SOFT_DISCONN;
usb_phy_on();
usb_phy_suspend();
USB_DEV_CTRL |= USB_DEV_CTRL_SOFT_DISCONN;
/* We don't care about SVC or SOF events */
/* Right now we don't handle suspend, so mask those too */
USB_DEV_INTR_MASK = USB_DEV_INTR_SVC |
USB_DEV_INTR_SOF |
USB_DEV_INTR_USB_SUSPEND |
USB_DEV_INTR_EARLY_SUSPEND;
USB_DEV_CFG = USB_DEV_CFG_STAT_ACK |
USB_DEV_CFG_UNI_DIR |
USB_DEV_CFG_PI_16BIT |
USB_DEV_CFG_HS |
USB_DEV_CFG_SELF_POWERED |
USB_DEV_CFG_CSR_PRG |
USB_DEV_CFG_PHY_ERR_DETECT;
USB_DEV_CTRL = USB_DEV_CTRL_DESC_UPDATE |
USB_DEV_CTRL_THRES_ENABLE |
USB_DEV_CTRL_BURST_ENABLE |
USB_DEV_CTRL_BLEN_8DWORDS |
USB_DEV_CTRL_TLEN_8THMAXSIZE;
USB_DEV_EP_INTR_MASK &= ~((1<<0) | (1<<16)); /* ep 0 */
reset_endpoints(1);
/* clear pending interrupts */
USB_DEV_EP_INTR = 0xffffffff;
USB_DEV_INTR = 0xffffffff;
VIC_INT_ENABLE = INTERRUPT_USB;
usb_phy_resume();
USB_DEV_CTRL &= ~USB_DEV_CTRL_SOFT_DISCONN;
USB_GPIO_CSR = USB_GPIO_TX_ENABLE_N
| USB_GPIO_TX_BIT_STUFF_EN
| USB_GPIO_XO_ON
| USB_GPIO_HS_INTR
| USB_GPIO_CLK_SEL10; /* 0x06180000; */
tick_add_task(usb_tick);
usb_enum_timeout = HZ; /* one second timeout for enumeration */
}
void usb_drv_exit(void)
{
tick_remove_task(usb_tick);
USB_DEV_CTRL |= (1<<10); /* soft disconnect */
usb_phy_suspend();
/*
* mask all interrupts _before_ writing to VIC_INT_EN_CLEAR,
* or else the core might latch the interrupt while
* the write ot VIC_INT_EN_CLEAR is in the pipeline and
* so cause a fake spurious interrupt.
*/
USB_DEV_EP_INTR_MASK = 0xffffffff;
USB_DEV_INTR_MASK = 0xffffffff;
VIC_INT_EN_CLEAR = INTERRUPT_USB;
CGU_USB &= ~(1<<5);
bitclr32(&CGU_PERI, CGU_USB_CLOCK_ENABLE);
/* Disable UVDD generating LDO */
ascodec_write(AS3515_USB_UTIL, ascodec_read(AS3515_USB_UTIL) & ~(1<<4));
usb_disable_pll();
cpu_boost(0);
initialized = false;
logf("usb_drv_exit() !!!!\n");
}
int usb_drv_port_speed(void)
{
return (USB_DEV_STS & USB_DEV_STS_MASK_SPD) ? 0 : 1;
}
int usb_drv_request_endpoint(int type, int dir)
{
int d = dir == USB_DIR_IN ? 0 : 1;
int i = 1; /* skip the control EP */
for(; i < USB_NUM_EPS; i++) {
if (endpoints[i][d].state & EP_STATE_ALLOCATED)
continue;
endpoints[i][d].state |= EP_STATE_ALLOCATED;
if (dir == USB_DIR_IN) {
USB_IEP_CTRL(i) = USB_EP_CTRL_FLUSH |
USB_EP_CTRL_SNAK |
USB_EP_CTRL_ACT |
(type << 4);
USB_DEV_EP_INTR_MASK &= ~(1<<i);
} else {
USB_OEP_CTRL(i) = USB_EP_CTRL_FLUSH |
USB_EP_CTRL_SNAK |
USB_EP_CTRL_ACT |
(type << 4);
USB_DEV_EP_INTR_MASK &= ~(1<<(16+i));
}
/* logf("usb_drv_request_endpoint(%d, %d): returning %02x\n", type, dir, i | dir); */
return i | dir;
}
logf("usb_drv_request_endpoint(%d, %d): no free endpoint found\n", type, dir);
return -1;
}
void usb_drv_release_endpoint(int ep)
{
int i = ep & 0x7f;
int d = ep & USB_DIR_IN ? 0 : 1;
if (i >= USB_NUM_EPS)
return;
/*
* Check for control EP and ignore it.
* Unfortunately the usb core calls
* usb_drv_release_endpoint() for ep=0..(USB_NUM_ENDPOINTS-1),
* but doesn't request a new control EP after that...
*/
if (i == 0 || /* Don't mask control EP */
(i == 2 && d == 1)) /* See reset_endpoints(), EP2_OUT == EP0_OUT */
return;
if (!(endpoints[i][d].state & EP_STATE_ALLOCATED))
return;
/* logf("usb_drv_release_endpoint(%d, %d)\n", i, d); */
endpoints[i][d].state = 0;
USB_DEV_EP_INTR_MASK |= (1<<(16*d+i));
USB_EP_CTRL(i, !d) = USB_EP_CTRL_FLUSH | USB_EP_CTRL_SNAK;
}
void usb_drv_cancel_all_transfers(void)
{
logf("usb_drv_cancel_all_transfers()\n");
return;
int flags = disable_irq_save();
reset_endpoints(0);
restore_irq(flags);
}
int usb_drv_recv_nonblocking(int ep, void *ptr, int len)
{
struct usb_dev_dma_desc *uc_desc = endpoints[ep][1].uc_desc;
ep &= 0x7f;
logf("usb_drv_recv_nonblocking(%d,%x,%d)\n", ep, (int)ptr, len);
if (len > USB_DMA_DESC_RXTX_BYTES)
panicf("usb_recv: len=%d > %d", len, USB_DMA_DESC_RXTX_BYTES);
if ((int)ptr & 31) {
logf("addr %08x not aligned!\n", (int)ptr);
}
endpoints[ep][1].state |= EP_STATE_BUSY;
endpoints[ep][1].len = len;
endpoints[ep][1].rc = -1;
/* remove data buffer from cache */
discard_dcache_range(ptr, len);
/* DMA setup */
uc_desc->status = USB_DMA_DESC_BS_HST_RDY |
USB_DMA_DESC_LAST |
len;
if (len == 0) {
uc_desc->status |= USB_DMA_DESC_ZERO_LEN;
uc_desc->data_ptr = 0;
} else {
uc_desc->data_ptr = AS3525_PHYSICAL_ADDR(ptr);
}
USB_OEP_DESC_PTR(ep) = AS3525_PHYSICAL_ADDR((int)&dmadescs[ep][1]);
USB_OEP_STS(ep) = USB_EP_STAT_OUT_RCVD; /* clear status */
/* Make sure receive DMA is on */
if (!(USB_DEV_CTRL & USB_DEV_CTRL_RDE)){
USB_DEV_CTRL |= USB_DEV_CTRL_RDE;
if (!(USB_DEV_CTRL & USB_DEV_CTRL_RDE))
logf("failed to enable RDE!\n");
}
USB_OEP_CTRL(ep) |= USB_EP_CTRL_CNAK; /* Go! */
if (USB_OEP_CTRL(ep) & USB_EP_CTRL_NAK) {
int i = 0;
while (USB_OEP_CTRL(ep) & USB_EP_CTRL_NAK) {
USB_OEP_CTRL(ep) |= USB_EP_CTRL_CNAK; /* Go! */
i++;
}
logf("ep%d CNAK needed %d retries CTRL=%x\n", ep, i, (int)USB_OEP_CTRL(ep));
}
return 0;
}
#if defined(LOGF_ENABLE)
static char hexbuf[1025];
static char hextab[16] = "0123456789abcdef";
char *make_hex(char *data, int len)
{
int i;
if (!((int)data & 0x40000000))
data = AS3525_UNCACHED_ADDR(data); /* don't pollute the cache */
if (len > 512)
len = 512;
for (i=0; i<len; i++) {
hexbuf[2*i ] = hextab[(unsigned char)data[i] >> 4 ];
hexbuf[2*i+1] = hextab[(unsigned char)data[i] & 0xf];
}
hexbuf[2*i] = 0;
return hexbuf;
}
#endif
static void ep_send(int ep, void *ptr, int len)
{
struct usb_dev_dma_desc *uc_desc = endpoints[ep][0].uc_desc;
endpoints[ep][0].state |= EP_STATE_BUSY;
endpoints[ep][0].len = len;
endpoints[ep][0].rc = -1;
/*
* I'm seeing a problem where Linux sends two SETUP requests,
* but fails to read the response from the first one.
* We then have the response we wanted to send still in our fifo,
* so flush the fifo before sending on the control endpoint.
*/
if (ep == 0)
USB_IEP_CTRL(ep) |= USB_EP_CTRL_FLUSH;
/* Make sure data is committed to memory */
commit_dcache_range(ptr, len);
logf("xx%s\n", make_hex(ptr, len));
uc_desc->status = USB_DMA_DESC_BS_HST_RDY |
USB_DMA_DESC_LAST |
len;
if (len == 0)
uc_desc->status |= USB_DMA_DESC_ZERO_LEN;
uc_desc->data_ptr = AS3525_PHYSICAL_ADDR(ptr);
USB_IEP_DESC_PTR(ep) = AS3525_PHYSICAL_ADDR((int)&dmadescs[ep][0]);
USB_IEP_STS(ep) = 0xffffffff; /* clear status */
/* start transfer */
USB_IEP_CTRL(ep) |= USB_EP_CTRL_CNAK | USB_EP_CTRL_PD;
/* HW automatically sets NAK bit later */
}
int usb_drv_send(int ep, void *ptr, int len)
{
logf("usb_drv_send(%d,%x,%d): ", ep, (int)ptr, len);
ep &= 0x7f;
if (ep == 0 && got_set_configuration) {
got_set_configuration = 0;
if (len != 0)
panicf("usb_drv_send: GSC, but len!=0");
/* Tell the HW we handled the request */
USB_DEV_CTRL |= USB_DEV_CTRL_APCSR_DONE;
return 0;
}
ep_send(ep, ptr, len);
if (semaphore_wait(&endpoints[ep][0].complete, HZ) == OBJ_WAIT_TIMEDOUT)
logf("send timed out!\n");
return endpoints[ep][0].rc;
}
int usb_drv_send_nonblocking(int ep, void *ptr, int len)
{
logf("usb_drv_send_nonblocking(%d,%x,%d): ", ep, (int)ptr, len);
ep &= 0x7f;
endpoints[ep][0].state |= EP_STATE_ASYNC;
ep_send(ep, ptr, len);
return 0;
}
static void handle_in_ep(int ep)
{
int ep_sts = USB_IEP_STS(ep) & ~USB_IEP_STS_MASK(ep);
if (ep > 3)
panicf("in_ep > 3?!");
USB_IEP_STS(ep) = ep_sts; /* ack */
if (ep_sts & USB_EP_STAT_BNA) { /* Buffer was not set up */
int ctrl = USB_IEP_CTRL(ep);
logf("ep%d IN, status %x ctrl %x (BNA)\n", ep, ep_sts, ctrl);
panicf("ep%d IN 0x%x 0x%x (BNA)", ep, ep_sts, ctrl);
}
if (ep_sts & USB_EP_STAT_TDC) {
endpoints[ep][0].state &= ~EP_STATE_BUSY;
endpoints[ep][0].rc = 0;
logf("EP%d %x %stx done len %x stat %08x\n",
ep, ep_sts, endpoints[ep][0].state & EP_STATE_ASYNC ? "async " :"",
endpoints[ep][0].len,
endpoints[ep][0].uc_desc->status);
if (endpoints[ep][0].state & EP_STATE_ASYNC) {
endpoints[ep][0].state &= ~EP_STATE_ASYNC;
usb_core_transfer_complete(ep, USB_DIR_IN, 0, endpoints[ep][0].len);
} else {
semaphore_release(&endpoints[ep][0].complete);
}
ep_sts &= ~USB_EP_STAT_TDC;
}
if (ep_sts) {
logf("ep%d IN, hwstat %lx, epstat %x\n", ep, USB_IEP_STS(ep), endpoints[ep][0].state);
panicf("ep%d IN 0x%x", ep, ep_sts);
}
}
static void handle_out_ep(int ep)
{
struct usb_ctrlrequest *req = (void*)AS3525_UNCACHED_ADDR(&setup_desc->data1);
int ep_sts = USB_OEP_STS(ep) & ~USB_OEP_STS_MASK(ep);
if (ep > 3)
panicf("out_ep > 3!?");
USB_OEP_STS(ep) = ep_sts; /* ACK */
if (ep_sts & USB_EP_STAT_BNA) { /* Buffer was not set up */
int ctrl = USB_OEP_CTRL(ep);
logf("ep%d OUT, status %x ctrl %x (BNA)\n", ep, ep_sts, ctrl);
panicf("ep%d OUT 0x%x 0x%x (BNA)", ep, ep_sts, ctrl);
ep_sts &= ~USB_EP_STAT_BNA;
}
if (ep_sts & USB_EP_STAT_OUT_RCVD) {
struct usb_dev_dma_desc *uc_desc = endpoints[ep][1].uc_desc;
int dma_sts = uc_desc->status;
int dma_len = dma_sts & 0xffff;
if (!(dma_sts & USB_DMA_DESC_ZERO_LEN)) {
logf("EP%d OUT token, st:%08x len:%d frm:%x data=%s epstate=%d\n",
ep, dma_sts & 0xf8000000, dma_len, (dma_sts >> 16) & 0x7ff,
make_hex(uc_desc->data_ptr, dma_len), endpoints[ep][1].state);
/*
* If parts of the just dmaed range are in cache, dump them now.
*/
discard_dcache_range(uc_desc->data_ptr, dma_len);
} else{
logf("EP%d OUT token, st:%08x frm:%x (no data)\n", ep,
dma_sts & 0xf8000000, (dma_sts >> 16) & 0x7ff);
}
if (endpoints[ep][1].state & EP_STATE_BUSY) {
endpoints[ep][1].state &= ~EP_STATE_BUSY;
endpoints[ep][1].rc = 0;
usb_core_transfer_complete(ep, USB_DIR_OUT, 0, dma_len);
} else {
logf("EP%d OUT, but no one was listening?\n", ep);
}
USB_OEP_CTRL(ep) |= USB_EP_CTRL_SNAK; /* make sure NAK is set */
ep_sts &= ~USB_EP_STAT_OUT_RCVD;
}
if (ep_sts & USB_EP_STAT_SETUP_RCVD) {
static struct usb_ctrlrequest req_copy;
req_copy = *req;
logf("t%ld:got SETUP packet: %s type=%d req=%d val=%d ind=%d len=%d\n",
current_tick,
make_hex((void*)req, 8),
req->bRequestType,
req->bRequest,
req->wValue,
req->wIndex,
req->wLength);
usb_core_legacy_control_request(&req_copy);
setup_desc_init(setup_desc);
ep_sts &= ~USB_EP_STAT_SETUP_RCVD;
}
if (ep_sts) {
logf("ep%d OUT, status %x\n", ep, ep_sts);
panicf("ep%d OUT 0x%x", ep, ep_sts);
}
}
/*
* This is a simplified version of the timer based RDE enable from
* the Linux amd5536udc.c driver.
* We need this because of the following hw issue:
* The usb_storage buffer is 63KB, but Linux sends 120KB.
* We get the first part, but upon re-enabling receive dma we
* get a 'buffer not available' error from the hardware, since
* we haven't gotten the next usb_drv_recv_nonblocking() from
* the stack yet.
* It seems the NAK bit is ignored here and the HW tries to dma
* the incoming data anyway.
* In theory I think the BNA error should be recoverable, but
* I haven't figured out how to do that yet and this approach seems
* to work for now.
*/
static void usb_tick(void)
{
static int rde_timer = 0;
static int rde_fails = 0;
if (usb_enum_timeout != -1) {
/*
* If the enum times out it's a charger, drop out of usb mode.
*/
if (usb_enum_timeout-- <= 0)
usb_remove_int();
}
if (USB_DEV_CTRL & USB_DEV_CTRL_RDE)
return;
if (!(USB_DEV_STS & USB_DEV_STS_RXF_EMPTY))
rde_timer++;
if (rde_timer < 2)
return;
logf("usb_tick: re-enabling RDE\n");
USB_DEV_CTRL |= USB_DEV_CTRL_RDE;
rde_timer = 0;
if (USB_DEV_CTRL & USB_DEV_CTRL_RDE) {
rde_fails = 0;
} else {
rde_fails++;
if (rde_fails > 3)
panicf("usb_tick: failed to set RDE");
}
}
/* interrupt service routine */
void INT_USB_FUNC(void)
{
int ep = USB_DEV_EP_INTR & ~USB_DEV_EP_INTR_MASK;
int intr = USB_DEV_INTR & ~USB_DEV_INTR_MASK;
/* ACK interrupt sources */
USB_DEV_EP_INTR = ep;
USB_DEV_INTR = intr;
/* Handle endpoint interrupts */
while (ep) {
int onebit = 31-__builtin_clz(ep);
if (onebit < 16) handle_in_ep(onebit);
else handle_out_ep(onebit-16);
ep &= ~(1 << onebit);
}
/* Handle general device interrupts */
if (intr) {
if (intr & USB_DEV_INTR_SET_INTERFACE) {/* SET_INTERFACE received */
logf("set interface\n");
panicf("set interface");
intr &= ~USB_DEV_INTR_SET_INTERFACE;
}
if (intr & USB_DEV_INTR_SET_CONFIG) {/* SET_CONFIGURATION received */
/*
* This is handled in HW, we have to fake a request here
* for usb_core.
*/
static struct usb_ctrlrequest set_config = {
bRequestType: USB_TYPE_STANDARD | USB_RECIP_DEVICE,
bRequest: USB_REQ_SET_CONFIGURATION,
wValue: 0,
wIndex: 0,
wLength: 0,
};
logf("set config\n");
got_set_configuration = 1;
set_config.wValue = USB_DEV_STS & USB_DEV_STS_MASK_CFG;
usb_core_legacy_control_request(&set_config);
intr &= ~USB_DEV_INTR_SET_CONFIG;
}
if (intr & USB_DEV_INTR_EARLY_SUSPEND) {/* idle >3ms detected */
logf("usb idle\n");
intr &= ~USB_DEV_INTR_EARLY_SUSPEND;
}
if (intr & USB_DEV_INTR_USB_RESET) {/* usb reset from host? */
logf("usb reset\n");
reset_endpoints(1);
usb_core_bus_reset();
intr &= ~USB_DEV_INTR_USB_RESET;
}
if (intr & USB_DEV_INTR_USB_SUSPEND) {/* suspend req from host? */
logf("usb suspend\n");
intr &= ~USB_DEV_INTR_USB_SUSPEND;
}
if (intr & USB_DEV_INTR_SOF) {/* sof received */
logf("sof\n");
intr &= ~USB_DEV_INTR_SOF;
}
if (intr & USB_DEV_INTR_SVC) {/* device status changed */
logf("svc: %08x otg: %08x\n", (int)USB_DEV_STS, (int)USB_OTG_CSR);
intr &= ~USB_DEV_INTR_SVC;
}
if (intr & USB_DEV_INTR_ENUM_DONE) {/* speed enumeration complete */
int spd = USB_DEV_STS & USB_DEV_STS_MASK_SPD; /* Enumerated Speed */
usb_enum_timeout = -1;
logf("speed enum complete: ");
if (spd == USB_DEV_STS_SPD_HS) logf("hs\n");
if (spd == USB_DEV_STS_SPD_FS) logf("fs\n");
if (spd == USB_DEV_STS_SPD_LS) logf("ls\n");
USB_DEV_CTRL |= USB_DEV_CTRL_APCSR_DONE;
USB_IEP_CTRL(0) |= USB_EP_CTRL_ACT;
USB_OEP_CTRL(0) |= USB_EP_CTRL_ACT;
intr &= ~USB_DEV_INTR_ENUM_DONE;
}
if (intr & USB_DEV_INTR_MYSTERY) {
logf("got mystery dev intr\n");
USB_DEV_INTR_MASK |= USB_DEV_INTR_MYSTERY;
intr &= ~USB_DEV_INTR_MYSTERY;
}
if (intr) {
logf("usb devirq 0x%x", intr);
panicf("usb devirq 0x%x", intr);
}
}
}
/* (not essential? , not implemented in usb-tcc.c) */
void usb_drv_set_test_mode(int mode)
{
(void)mode;
}
/* handled internally by controller */
void usb_drv_set_address(int address)
{
(void)address;
}
void usb_drv_stall(int ep, bool stall, bool in)
{
if (stall) USB_EP_CTRL(ep, in) |= USB_EP_CTRL_STALL;
else USB_EP_CTRL(ep, in) &= ~USB_EP_CTRL_STALL;
}
bool usb_drv_stalled(int ep, bool in)
{
return USB_EP_CTRL(ep, in) & USB_EP_CTRL_STALL;
}
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