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Commit 32fee1df authored by Arnd Bergmann's avatar Arnd Bergmann Committed by Greg Kroah-Hartman
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usb: musb: remove unused davinci support 

The musb-davinci driver was only used on dm644x, which got removed
in linux-6.0. The only remaining davinci machines are da8xx
devicetree based and do not use this hardware.
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
Acked-by: default avatarBartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://lore.kernel.org/r/20221019152947.3857217-6-arnd@kernel.orgSigned-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent a84436a9
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drivers/usb/musb/Kconfig
View file @ 32fee1df
......@@ -70,12 +70,6 @@ config USB_MUSB_SUNXI
select GENERIC_PHY
select SUNXI_SRAM
config USB_MUSB_DAVINCI
tristate "DaVinci"
depends on ARCH_DAVINCI_DMx
depends on NOP_USB_XCEIV
depends on BROKEN
config USB_MUSB_DA8XX
tristate "DA8xx/OMAP-L1x"
depends on ARCH_DAVINCI_DA8XX
......@@ -161,12 +155,6 @@ config USB_INVENTRA_DMA
help
Enable DMA transfers using Mentor's engine.
config USB_TI_CPPI_DMA
bool 'TI CPPI (Davinci)'
depends on USB_MUSB_DAVINCI
help
Enable DMA transfers when TI CPPI DMA is available.
config USB_TI_CPPI41_DMA
bool 'TI CPPI 4.1'
depends on (ARCH_OMAP || ARCH_DAVINCI_DA8XX) && DMADEVICES
......
drivers/usb/musb/Makefile
View file @ 32fee1df
......@@ -19,7 +19,6 @@ obj-$(CONFIG_USB_MUSB_OMAP2PLUS) += omap2430.o
obj-$(CONFIG_USB_MUSB_AM35X) += am35x.o
obj-$(CONFIG_USB_MUSB_DSPS) += musb_dsps.o
obj-$(CONFIG_USB_MUSB_TUSB6010) += tusb6010.o
obj-$(CONFIG_USB_MUSB_DAVINCI) += davinci.o
obj-$(CONFIG_USB_MUSB_DA8XX) += da8xx.o
obj-$(CONFIG_USB_MUSB_UX500) += ux500.o
obj-$(CONFIG_USB_MUSB_JZ4740) += jz4740.o
......@@ -33,7 +32,6 @@ obj-$(CONFIG_USB_MUSB_POLARFIRE_SOC) += mpfs.o
# though PIO is always there to back up DMA, and for ep0
musb_hdrc-$(CONFIG_USB_INVENTRA_DMA) += musbhsdma.o
musb_hdrc-$(CONFIG_USB_TI_CPPI_DMA) += cppi_dma.o
musb_hdrc-$(CONFIG_USB_TUSB_OMAP_DMA) += tusb6010_omap.o
musb_hdrc-$(CONFIG_USB_UX500_DMA) += ux500_dma.o
musb_hdrc-$(CONFIG_USB_TI_CPPI41_DMA) += musb_cppi41.o
drivers/usb/musb/cppi_dma.c deleted 100644 → 0
View file @ a84436a9
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2005-2006 by Texas Instruments
*
* This file implements a DMA interface using TI's CPPI DMA.
* For now it's DaVinci-only, but CPPI isn't specific to DaVinci or USB.
* The TUSB6020, using VLYNQ, has CPPI that looks much like DaVinci.
*/
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include "musb_core.h"
#include "musb_debug.h"
#include "cppi_dma.h"
#include "davinci.h"
/* CPPI DMA status 7-mar-2006:
*
* - See musb_{host,gadget}.c for more info
*
* - Correct RX DMA generally forces the engine into irq-per-packet mode,
* which can easily saturate the CPU under non-mass-storage loads.
*
* NOTES 24-aug-2006 (2.6.18-rc4):
*
* - peripheral RXDMA wedged in a test with packets of length 512/512/1.
* evidently after the 1 byte packet was received and acked, the queue
* of BDs got garbaged so it wouldn't empty the fifo. (rxcsr 0x2003,
* and RX DMA0: 4 left, 80000000 8feff880, 8feff860 8feff860; 8f321401
* 004001ff 00000001 .. 8feff860) Host was just getting NAKed on tx
* of its next (512 byte) packet. IRQ issues?
*
* REVISIT: the "transfer DMA" glue between CPPI and USB fifos will
* evidently also directly update the RX and TX CSRs ... so audit all
* host and peripheral side DMA code to avoid CSR access after DMA has
* been started.
*/
/* REVISIT now we can avoid preallocating these descriptors; or
* more simply, switch to a global freelist not per-channel ones.
* Note: at full speed, 64 descriptors == 4K bulk data.
*/
#define NUM_TXCHAN_BD 64
#define NUM_RXCHAN_BD 64
static inline void cpu_drain_writebuffer(void)
{
wmb();
#ifdef CONFIG_CPU_ARM926T
/* REVISIT this "should not be needed",
* but lack of it sure seemed to hurt ...
*/
asm("mcr p15, 0, r0, c7, c10, 4 @ drain write buffer\n");
#endif
}
static inline struct cppi_descriptor *cppi_bd_alloc(struct cppi_channel *c)
{
struct cppi_descriptor *bd = c->freelist;
if (bd)
c->freelist = bd->next;
return bd;
}
static inline void
cppi_bd_free(struct cppi_channel *c, struct cppi_descriptor *bd)
{
if (!bd)
return;
bd->next = c->freelist;
c->freelist = bd;
}
/*
* Start DMA controller
*
* Initialize the DMA controller as necessary.
*/
/* zero out entire rx state RAM entry for the channel */
static void cppi_reset_rx(struct cppi_rx_stateram __iomem *rx)
{
musb_writel(&rx->rx_skipbytes, 0, 0);
musb_writel(&rx->rx_head, 0, 0);
musb_writel(&rx->rx_sop, 0, 0);
musb_writel(&rx->rx_current, 0, 0);
musb_writel(&rx->rx_buf_current, 0, 0);
musb_writel(&rx->rx_len_len, 0, 0);
musb_writel(&rx->rx_cnt_cnt, 0, 0);
}
/* zero out entire tx state RAM entry for the channel */
static void cppi_reset_tx(struct cppi_tx_stateram __iomem *tx, u32 ptr)
{
musb_writel(&tx->tx_head, 0, 0);
musb_writel(&tx->tx_buf, 0, 0);
musb_writel(&tx->tx_current, 0, 0);
musb_writel(&tx->tx_buf_current, 0, 0);
musb_writel(&tx->tx_info, 0, 0);
musb_writel(&tx->tx_rem_len, 0, 0);
/* musb_writel(&tx->tx_dummy, 0, 0); */
musb_writel(&tx->tx_complete, 0, ptr);
}
static void cppi_pool_init(struct cppi *cppi, struct cppi_channel *c)
{
int j;
/* initialize channel fields */
c->head = NULL;
c->tail = NULL;
c->last_processed = NULL;
c->channel.status = MUSB_DMA_STATUS_UNKNOWN;
c->controller = cppi;
c->is_rndis = 0;
c->freelist = NULL;
/* build the BD Free list for the channel */
for (j = 0; j < NUM_TXCHAN_BD + 1; j++) {
struct cppi_descriptor *bd;
dma_addr_t dma;
bd = dma_pool_alloc(cppi->pool, GFP_KERNEL, &dma);
bd->dma = dma;
cppi_bd_free(c, bd);
}
}
static int cppi_channel_abort(struct dma_channel *);
static void cppi_pool_free(struct cppi_channel *c)
{
struct cppi *cppi = c->controller;
struct cppi_descriptor *bd;
(void) cppi_channel_abort(&c->channel);
c->channel.status = MUSB_DMA_STATUS_UNKNOWN;
c->controller = NULL;
/* free all its bds */
bd = c->last_processed;
do {
if (bd)
dma_pool_free(cppi->pool, bd, bd->dma);
bd = cppi_bd_alloc(c);
} while (bd);
c->last_processed = NULL;
}
static void cppi_controller_start(struct cppi *controller)
{
void __iomem *tibase;
int i;
/* do whatever is necessary to start controller */
for (i = 0; i < ARRAY_SIZE(controller->tx); i++) {
controller->tx[i].transmit = true;
controller->tx[i].index = i;
}
for (i = 0; i < ARRAY_SIZE(controller->rx); i++) {
controller->rx[i].transmit = false;
controller->rx[i].index = i;
}
/* setup BD list on a per channel basis */
for (i = 0; i < ARRAY_SIZE(controller->tx); i++)
cppi_pool_init(controller, controller->tx + i);
for (i = 0; i < ARRAY_SIZE(controller->rx); i++)
cppi_pool_init(controller, controller->rx + i);
tibase = controller->tibase;
INIT_LIST_HEAD(&controller->tx_complete);
/* initialise tx/rx channel head pointers to zero */
for (i = 0; i < ARRAY_SIZE(controller->tx); i++) {
struct cppi_channel *tx_ch = controller->tx + i;
struct cppi_tx_stateram __iomem *tx;
INIT_LIST_HEAD(&tx_ch->tx_complete);
tx = tibase + DAVINCI_TXCPPI_STATERAM_OFFSET(i);
tx_ch->state_ram = tx;
cppi_reset_tx(tx, 0);
}
for (i = 0; i < ARRAY_SIZE(controller->rx); i++) {
struct cppi_channel *rx_ch = controller->rx + i;
struct cppi_rx_stateram __iomem *rx;
INIT_LIST_HEAD(&rx_ch->tx_complete);
rx = tibase + DAVINCI_RXCPPI_STATERAM_OFFSET(i);
rx_ch->state_ram = rx;
cppi_reset_rx(rx);
}
/* enable individual cppi channels */
musb_writel(tibase, DAVINCI_TXCPPI_INTENAB_REG,
DAVINCI_DMA_ALL_CHANNELS_ENABLE);
musb_writel(tibase, DAVINCI_RXCPPI_INTENAB_REG,
DAVINCI_DMA_ALL_CHANNELS_ENABLE);
/* enable tx/rx CPPI control */
musb_writel(tibase, DAVINCI_TXCPPI_CTRL_REG, DAVINCI_DMA_CTRL_ENABLE);
musb_writel(tibase, DAVINCI_RXCPPI_CTRL_REG, DAVINCI_DMA_CTRL_ENABLE);
/* disable RNDIS mode, also host rx RNDIS autorequest */
musb_writel(tibase, DAVINCI_RNDIS_REG, 0);
musb_writel(tibase, DAVINCI_AUTOREQ_REG, 0);
}
/*
* Stop DMA controller
*
* De-Init the DMA controller as necessary.
*/
static void cppi_controller_stop(struct cppi *controller)
{
void __iomem *tibase;
int i;
struct musb *musb;
musb = controller->controller.musb;
tibase = controller->tibase;
/* DISABLE INDIVIDUAL CHANNEL Interrupts */
musb_writel(tibase, DAVINCI_TXCPPI_INTCLR_REG,
DAVINCI_DMA_ALL_CHANNELS_ENABLE);
musb_writel(tibase, DAVINCI_RXCPPI_INTCLR_REG,
DAVINCI_DMA_ALL_CHANNELS_ENABLE);
musb_dbg(musb, "Tearing down RX and TX Channels");
for (i = 0; i < ARRAY_SIZE(controller->tx); i++) {
/* FIXME restructure of txdma to use bds like rxdma */
controller->tx[i].last_processed = NULL;
cppi_pool_free(controller->tx + i);
}
for (i = 0; i < ARRAY_SIZE(controller->rx); i++)
cppi_pool_free(controller->rx + i);
/* in Tx Case proper teardown is supported. We resort to disabling
* Tx/Rx CPPI after cleanup of Tx channels. Before TX teardown is
* complete TX CPPI cannot be disabled.
*/
/*disable tx/rx cppi */
musb_writel(tibase, DAVINCI_TXCPPI_CTRL_REG, DAVINCI_DMA_CTRL_DISABLE);
musb_writel(tibase, DAVINCI_RXCPPI_CTRL_REG, DAVINCI_DMA_CTRL_DISABLE);
}
/* While dma channel is allocated, we only want the core irqs active
* for fault reports, otherwise we'd get irqs that we don't care about.
* Except for TX irqs, where dma done != fifo empty and reusable ...
*
* NOTE: docs don't say either way, but irq masking **enables** irqs.
*
* REVISIT same issue applies to pure PIO usage too, and non-cppi dma...
*/
static inline void core_rxirq_disable(void __iomem *tibase, unsigned epnum)
{
musb_writel(tibase, DAVINCI_USB_INT_MASK_CLR_REG, 1 << (epnum + 8));
}
static inline void core_rxirq_enable(void __iomem *tibase, unsigned epnum)
{
musb_writel(tibase, DAVINCI_USB_INT_MASK_SET_REG, 1 << (epnum + 8));
}
/*
* Allocate a CPPI Channel for DMA. With CPPI, channels are bound to
* each transfer direction of a non-control endpoint, so allocating
* (and deallocating) is mostly a way to notice bad housekeeping on
* the software side. We assume the irqs are always active.
*/
static struct dma_channel *
cppi_channel_allocate(struct dma_controller *c,
struct musb_hw_ep *ep, u8 transmit)
{
struct cppi *controller;
u8 index;
struct cppi_channel *cppi_ch;
void __iomem *tibase;
struct musb *musb;
controller = container_of(c, struct cppi, controller);
tibase = controller->tibase;
musb = c->musb;
/* ep0 doesn't use DMA; remember cppi indices are 0..N-1 */
index = ep->epnum - 1;
/* return the corresponding CPPI Channel Handle, and
* probably disable the non-CPPI irq until we need it.
*/
if (transmit) {
if (index >= ARRAY_SIZE(controller->tx)) {
musb_dbg(musb, "no %cX%d CPPI channel", 'T', index);
return NULL;
}
cppi_ch = controller->tx + index;
} else {
if (index >= ARRAY_SIZE(controller->rx)) {
musb_dbg(musb, "no %cX%d CPPI channel", 'R', index);
return NULL;
}
cppi_ch = controller->rx + index;
core_rxirq_disable(tibase, ep->epnum);
}
/* REVISIT make this an error later once the same driver code works
* with the other DMA engine too
*/
if (cppi_ch->hw_ep)
musb_dbg(musb, "re-allocating DMA%d %cX channel %p",
index, transmit ? 'T' : 'R', cppi_ch);
cppi_ch->hw_ep = ep;
cppi_ch->channel.status = MUSB_DMA_STATUS_FREE;
cppi_ch->channel.max_len = 0x7fffffff;
musb_dbg(musb, "Allocate CPPI%d %cX", index, transmit ? 'T' : 'R');
return &cppi_ch->channel;
}
/* Release a CPPI Channel. */
static void cppi_channel_release(struct dma_channel *channel)
{
struct cppi_channel *c;
void __iomem *tibase;
/* REVISIT: for paranoia, check state and abort if needed... */
c = container_of(channel, struct cppi_channel, channel);
tibase = c->controller->tibase;
if (!c->hw_ep)
musb_dbg(c->controller->controller.musb,
"releasing idle DMA channel %p", c);
else if (!c->transmit)
core_rxirq_enable(tibase, c->index + 1);
/* for now, leave its cppi IRQ enabled (we won't trigger it) */
c->hw_ep = NULL;
channel->status = MUSB_DMA_STATUS_UNKNOWN;
}
/* Context: controller irqlocked */
static void
cppi_dump_rx(int level, struct cppi_channel *c, const char *tag)
{
void __iomem *base = c->controller->mregs;
struct cppi_rx_stateram __iomem *rx = c->state_ram;
musb_ep_select(base, c->index + 1);
musb_dbg(c->controller->controller.musb,
"RX DMA%d%s: %d left, csr %04x, "
"%08x H%08x S%08x C%08x, "
"B%08x L%08x %08x .. %08x",
c->index, tag,
musb_readl(c->controller->tibase,
DAVINCI_RXCPPI_BUFCNT0_REG + 4 * c->index),
musb_readw(c->hw_ep->regs, MUSB_RXCSR),
musb_readl(&rx->rx_skipbytes, 0),
musb_readl(&rx->rx_head, 0),
musb_readl(&rx->rx_sop, 0),
musb_readl(&rx->rx_current, 0),
musb_readl(&rx->rx_buf_current, 0),
musb_readl(&rx->rx_len_len, 0),
musb_readl(&rx->rx_cnt_cnt, 0),
musb_readl(&rx->rx_complete, 0)
);
}
/* Context: controller irqlocked */
static void
cppi_dump_tx(int level, struct cppi_channel *c, const char *tag)
{
void __iomem *base = c->controller->mregs;
struct cppi_tx_stateram __iomem *tx = c->state_ram;
musb_ep_select(base, c->index + 1);
musb_dbg(c->controller->controller.musb,
"TX DMA%d%s: csr %04x, "
"H%08x S%08x C%08x %08x, "
"F%08x L%08x .. %08x",
c->index, tag,
musb_readw(c->hw_ep->regs, MUSB_TXCSR),
musb_readl(&tx->tx_head, 0),
musb_readl(&tx->tx_buf, 0),
musb_readl(&tx->tx_current, 0),
musb_readl(&tx->tx_buf_current, 0),
musb_readl(&tx->tx_info, 0),
musb_readl(&tx->tx_rem_len, 0),
/* dummy/unused word 6 */
musb_readl(&tx->tx_complete, 0)
);
}
/* Context: controller irqlocked */
static inline void
cppi_rndis_update(struct cppi_channel *c, int is_rx,
void __iomem *tibase, int is_rndis)
{
/* we may need to change the rndis flag for this cppi channel */
if (c->is_rndis != is_rndis) {
u32 value = musb_readl(tibase, DAVINCI_RNDIS_REG);
u32 temp = 1 << (c->index);
if (is_rx)
temp <<= 16;
if (is_rndis)
value |= temp;
else
value &= ~temp;
musb_writel(tibase, DAVINCI_RNDIS_REG, value);
c->is_rndis = is_rndis;
}
}
static void cppi_dump_rxbd(const char *tag, struct cppi_descriptor *bd)
{
pr_debug("RXBD/%s %08x: "
"nxt %08x buf %08x off.blen %08x opt.plen %08x\n",
tag, bd->dma,
bd->hw_next, bd->hw_bufp, bd->hw_off_len,
bd->hw_options);
}
static void cppi_dump_rxq(int level, const char *tag, struct cppi_channel *rx)
{
struct cppi_descriptor *bd;
cppi_dump_rx(level, rx, tag);
if (rx->last_processed)
cppi_dump_rxbd("last", rx->last_processed);
for (bd = rx->head; bd; bd = bd->next)
cppi_dump_rxbd("active", bd);
}
/* NOTE: DaVinci autoreq is ignored except for host side "RNDIS" mode RX;
* so we won't ever use it (see "CPPI RX Woes" below).
*/
static inline int cppi_autoreq_update(struct cppi_channel *rx,
void __iomem *tibase, int onepacket, unsigned n_bds)
{
u32 val;
#ifdef RNDIS_RX_IS_USABLE
u32 tmp;
/* assert(is_host_active(musb)) */
/* start from "AutoReq never" */
tmp = musb_readl(tibase, DAVINCI_AUTOREQ_REG);
val = tmp & ~((0x3) << (rx->index * 2));
/* HCD arranged reqpkt for packet #1. we arrange int
* for all but the last one, maybe in two segments.
*/
if (!onepacket) {
#if 0
/* use two segments, autoreq "all" then the last "never" */
val |= ((0x3) << (rx->index * 2));
n_bds--;
#else
/* one segment, autoreq "all-but-last" */
val |= ((0x1) << (rx->index * 2));
#endif
}
if (val != tmp) {
int n = 100;
/* make sure that autoreq is updated before continuing */
musb_writel(tibase, DAVINCI_AUTOREQ_REG, val);
do {
tmp = musb_readl(tibase, DAVINCI_AUTOREQ_REG);
if (tmp == val)
break;
cpu_relax();
} while (n-- > 0);
}
#endif
/* REQPKT is turned off after each segment */
if (n_bds && rx->channel.actual_len) {
void __iomem *regs = rx->hw_ep->regs;
val = musb_readw(regs, MUSB_RXCSR);
if (!(val & MUSB_RXCSR_H_REQPKT)) {
val |= MUSB_RXCSR_H_REQPKT | MUSB_RXCSR_H_WZC_BITS;
musb_writew(regs, MUSB_RXCSR, val);
/* flush writebuffer */
val = musb_readw(regs, MUSB_RXCSR);
}
}
return n_bds;
}
/* Buffer enqueuing Logic:
*
* - RX builds new queues each time, to help handle routine "early
* termination" cases (faults, including errors and short reads)
* more correctly.
*
* - for now, TX reuses the same queue of BDs every time
*
* REVISIT long term, we want a normal dynamic model.
* ... the goal will be to append to the
* existing queue, processing completed "dma buffers" (segments) on the fly.
*
* Otherwise we force an IRQ latency between requests, which slows us a lot
* (especially in "transparent" dma). Unfortunately that model seems to be
* inherent in the DMA model from the Mentor code, except in the rare case
* of transfers big enough (~128+ KB) that we could append "middle" segments
* in the TX paths. (RX can't do this, see below.)
*
* That's true even in the CPPI- friendly iso case, where most urbs have
* several small segments provided in a group and where the "packet at a time"
* "transparent" DMA model is always correct, even on the RX side.
*/
/*
* CPPI TX:
* ========
* TX is a lot more reasonable than RX; it doesn't need to run in
* irq-per-packet mode very often. RNDIS mode seems to behave too
* (except how it handles the exactly-N-packets case). Building a
* txdma queue with multiple requests (urb or usb_request) looks
* like it would work ... but fault handling would need much testing.
*
* The main issue with TX mode RNDIS relates to transfer lengths that
* are an exact multiple of the packet length. It appears that there's
* a hiccup in that case (maybe the DMA completes before the ZLP gets
* written?) boiling down to not being able to rely on CPPI writing any
* terminating zero length packet before the next transfer is written.
* So that's punted to PIO; better yet, gadget drivers can avoid it.
*
* Plus, there's allegedly an undocumented constraint that rndis transfer
* length be a multiple of 64 bytes ... but the chip doesn't act that
* way, and we really don't _want_ that behavior anyway.
*
* On TX, "transparent" mode works ... although experiments have shown
* problems trying to use the SOP/EOP bits in different USB packets.
*
* REVISIT try to handle terminating zero length packets using CPPI
* instead of doing it by PIO after an IRQ. (Meanwhile, make Ethernet
* links avoid that issue by forcing them to avoid zlps.)
*/
static void
cppi_next_tx_segment(struct musb *musb, struct cppi_channel *tx)
{
unsigned maxpacket = tx->maxpacket;
dma_addr_t addr = tx->buf_dma + tx->offset;
size_t length = tx->buf_len - tx->offset;
struct cppi_descriptor *bd;
unsigned n_bds;
unsigned i;
struct cppi_tx_stateram __iomem *tx_ram = tx->state_ram;
int rndis;
/* TX can use the CPPI "rndis" mode, where we can probably fit this
* transfer in one BD and one IRQ. The only time we would NOT want
* to use it is when hardware constraints prevent it, or if we'd
* trigger the "send a ZLP?" confusion.
*/
rndis = (maxpacket & 0x3f) == 0
&& length > maxpacket
&& length < 0xffff
&& (length % maxpacket) != 0;
if (rndis) {
maxpacket = length;
n_bds = 1;
} else {
if (length)
n_bds = DIV_ROUND_UP(length, maxpacket);
else
n_bds = 1;
n_bds = min(n_bds, (unsigned) NUM_TXCHAN_BD);
length = min(n_bds * maxpacket, length);
}
musb_dbg(musb, "TX DMA%d, pktSz %d %s bds %d dma 0x%llx len %u",
tx->index,
maxpacket,
rndis ? "rndis" : "transparent",
n_bds,
(unsigned long long)addr, length);
cppi_rndis_update(tx, 0, musb->ctrl_base, rndis);
/* assuming here that channel_program is called during
* transfer initiation ... current code maintains state
* for one outstanding request only (no queues, not even
* the implicit ones of an iso urb).
*/
bd = tx->freelist;
tx->head = bd;
tx->last_processed = NULL;
/* FIXME use BD pool like RX side does, and just queue
* the minimum number for this request.
*/
/* Prepare queue of BDs first, then hand it to hardware.
* All BDs except maybe the last should be of full packet
* size; for RNDIS there _is_ only that last packet.
*/
for (i = 0; i < n_bds; ) {
if (++i < n_bds && bd->next)
bd->hw_next = bd->next->dma;
else
bd->hw_next = 0;
bd->hw_bufp = tx->buf_dma + tx->offset;
/* FIXME set EOP only on the last packet,
* SOP only on the first ... avoid IRQs
*/
if ((tx->offset + maxpacket) <= tx->buf_len) {
tx->offset += maxpacket;
bd->hw_off_len = maxpacket;
bd->hw_options = CPPI_SOP_SET | CPPI_EOP_SET
| CPPI_OWN_SET | maxpacket;
} else {
/* only this one may be a partial USB Packet */
u32 partial_len;
partial_len = tx->buf_len - tx->offset;
tx->offset = tx->buf_len;
bd->hw_off_len = partial_len;
bd->hw_options = CPPI_SOP_SET | CPPI_EOP_SET
| CPPI_OWN_SET | partial_len;
if (partial_len == 0)
bd->hw_options |= CPPI_ZERO_SET;
}
musb_dbg(musb, "TXBD %p: nxt %08x buf %08x len %04x opt %08x",
bd, bd->hw_next, bd->hw_bufp,
bd->hw_off_len, bd->hw_options);
/* update the last BD enqueued to the list */
tx->tail = bd;
bd = bd->next;
}
/* BDs live in DMA-coherent memory, but writes might be pending */
cpu_drain_writebuffer();
/* Write to the HeadPtr in state RAM to trigger */
musb_writel(&tx_ram->tx_head, 0, (u32)tx->freelist->dma);
cppi_dump_tx(5, tx, "/S");
}
/*
* CPPI RX Woes:
* =============
* Consider a 1KB bulk RX buffer in two scenarios: (a) it's fed two 300 byte
* packets back-to-back, and (b) it's fed two 512 byte packets back-to-back.
* (Full speed transfers have similar scenarios.)
*
* The correct behavior for Linux is that (a) fills the buffer with 300 bytes,
* and the next packet goes into a buffer that's queued later; while (b) fills
* the buffer with 1024 bytes. How to do that with CPPI?
*
* - RX queues in "rndis" mode -- one single BD -- handle (a) correctly, but
* (b) loses **BADLY** because nothing (!) happens when that second packet
* fills the buffer, much less when a third one arrives. (Which makes this
* not a "true" RNDIS mode. In the RNDIS protocol short-packet termination
* is optional, and it's fine if peripherals -- not hosts! -- pad messages
* out to end-of-buffer. Standard PCI host controller DMA descriptors
* implement that mode by default ... which is no accident.)
*
* - RX queues in "transparent" mode -- two BDs with 512 bytes each -- have
* converse problems: (b) is handled right, but (a) loses badly. CPPI RX
* ignores SOP/EOP markings and processes both of those BDs; so both packets
* are loaded into the buffer (with a 212 byte gap between them), and the next
* buffer queued will NOT get its 300 bytes of data. (It seems like SOP/EOP
* are intended as outputs for RX queues, not inputs...)
*
* - A variant of "transparent" mode -- one BD at a time -- is the only way to
* reliably make both cases work, with software handling both cases correctly
* and at the significant penalty of needing an IRQ per packet. (The lack of
* I/O overlap can be slightly ameliorated by enabling double buffering.)
*
* So how to get rid of IRQ-per-packet? The transparent multi-BD case could
* be used in special cases like mass storage, which sets URB_SHORT_NOT_OK
* (or maybe its peripheral side counterpart) to flag (a) scenarios as errors
* with guaranteed driver level fault recovery and scrubbing out what's left
* of that garbaged datastream.
*
* But there seems to be no way to identify the cases where CPPI RNDIS mode
* is appropriate -- which do NOT include RNDIS host drivers, but do include
* the CDC Ethernet driver! -- and the documentation is incomplete/wrong.
* So we can't _ever_ use RX RNDIS mode ... except by using a heuristic
* that applies best on the peripheral side (and which could fail rudely).
*
* Leaving only "transparent" mode; we avoid multi-bd modes in almost all
* cases other than mass storage class. Otherwise we're correct but slow,
* since CPPI penalizes our need for a "true RNDIS" default mode.
*/
/* Heuristic, intended to kick in for ethernet/rndis peripheral ONLY
*
* IFF
* (a) peripheral mode ... since rndis peripherals could pad their
* writes to hosts, causing i/o failure; or we'd have to cope with
* a largely unknowable variety of host side protocol variants
* (b) and short reads are NOT errors ... since full reads would
* cause those same i/o failures
* (c) and read length is
* - less than 64KB (max per cppi descriptor)
* - not a multiple of 4096 (g_zero default, full reads typical)
* - N (>1) packets long, ditto (full reads not EXPECTED)
* THEN
* try rx rndis mode
*
* Cost of heuristic failing: RXDMA wedges at the end of transfers that
* fill out the whole buffer. Buggy host side usb network drivers could
* trigger that, but "in the field" such bugs seem to be all but unknown.
*
* So this module parameter lets the heuristic be disabled. When using
* gadgetfs, the heuristic will probably need to be disabled.
*/
static bool cppi_rx_rndis = 1;
module_param(cppi_rx_rndis, bool, 0);
MODULE_PARM_DESC(cppi_rx_rndis, "enable/disable RX RNDIS heuristic");
/**
* cppi_next_rx_segment - dma read for the next chunk of a buffer
* @musb: the controller
* @rx: dma channel
* @onepacket: true unless caller treats short reads as errors, and
* performs fault recovery above usbcore.
* Context: controller irqlocked
*
* See above notes about why we can't use multi-BD RX queues except in
* rare cases (mass storage class), and can never use the hardware "rndis"
* mode (since it's not a "true" RNDIS mode) with complete safety..
*
* It's ESSENTIAL that callers specify "onepacket" mode unless they kick in
* code to recover from corrupted datastreams after each short transfer.
*/
static void
cppi_next_rx_segment(struct musb *musb, struct cppi_channel *rx, int onepacket)
{
unsigned maxpacket = rx->maxpacket;
dma_addr_t addr = rx->buf_dma + rx->offset;
size_t length = rx->buf_len - rx->offset;
struct cppi_descriptor *bd, *tail;
unsigned n_bds;
unsigned i;
void __iomem *tibase = musb->ctrl_base;
int is_rndis = 0;
struct cppi_rx_stateram __iomem *rx_ram = rx->state_ram;
struct cppi_descriptor *d;
if (onepacket) {
/* almost every USB driver, host or peripheral side */
n_bds = 1;
/* maybe apply the heuristic above */
if (cppi_rx_rndis
&& is_peripheral_active(musb)
&& length > maxpacket
&& (length & ~0xffff) == 0
&& (length & 0x0fff) != 0
&& (length & (maxpacket - 1)) == 0) {
maxpacket = length;
is_rndis = 1;
}
} else {
/* virtually nothing except mass storage class */
if (length > 0xffff) {
n_bds = 0xffff / maxpacket;
length = n_bds * maxpacket;
} else {
n_bds = DIV_ROUND_UP(length, maxpacket);
}
if (n_bds == 1)
onepacket = 1;
else
n_bds = min(n_bds, (unsigned) NUM_RXCHAN_BD);
}
/* In host mode, autorequest logic can generate some IN tokens; it's
* tricky since we can't leave REQPKT set in RXCSR after the transfer
* finishes. So: multipacket transfers involve two or more segments.
* And always at least two IRQs ... RNDIS mode is not an option.
*/
if (is_host_active(musb))
n_bds = cppi_autoreq_update(rx, tibase, onepacket, n_bds);
cppi_rndis_update(rx, 1, musb->ctrl_base, is_rndis);
length = min(n_bds * maxpacket, length);
musb_dbg(musb, "RX DMA%d seg, maxp %d %s bds %d (cnt %d) "
"dma 0x%llx len %u %u/%u",
rx->index, maxpacket,
onepacket
? (is_rndis ? "rndis" : "onepacket")
: "multipacket",
n_bds,
musb_readl(tibase,
DAVINCI_RXCPPI_BUFCNT0_REG + (rx->index * 4))
& 0xffff,
(unsigned long long)addr, length,
rx->channel.actual_len, rx->buf_len);
/* only queue one segment at a time, since the hardware prevents
* correct queue shutdown after unexpected short packets
*/
bd = cppi_bd_alloc(rx);
rx->head = bd;
/* Build BDs for all packets in this segment */
for (i = 0, tail = NULL; bd && i < n_bds; i++, tail = bd) {
u32 bd_len;
if (i) {
bd = cppi_bd_alloc(rx);
if (!bd)
break;
tail->next = bd;
tail->hw_next = bd->dma;
}
bd->hw_next = 0;
/* all but the last packet will be maxpacket size */
if (maxpacket < length)
bd_len = maxpacket;
else
bd_len = length;
bd->hw_bufp = addr;
addr += bd_len;
rx->offset += bd_len;
bd->hw_off_len = (0 /*offset*/ << 16) + bd_len;
bd->buflen = bd_len;
bd->hw_options = CPPI_OWN_SET | (i == 0 ? length : 0);
length -= bd_len;
}
/* we always expect at least one reusable BD! */
if (!tail) {
WARNING("rx dma%d -- no BDs? need %d\n", rx->index, n_bds);
return;
} else if (i < n_bds)
WARNING("rx dma%d -- only %d of %d BDs\n", rx->index, i, n_bds);
tail->next = NULL;
tail->hw_next = 0;
bd = rx->head;
rx->tail = tail;
/* short reads and other faults should terminate this entire
* dma segment. we want one "dma packet" per dma segment, not
* one per USB packet, terminating the whole queue at once...
* NOTE that current hardware seems to ignore SOP and EOP.
*/
bd->hw_options |= CPPI_SOP_SET;
tail->hw_options |= CPPI_EOP_SET;
for (d = rx->head; d; d = d->next)
cppi_dump_rxbd("S", d);
/* in case the preceding transfer left some state... */
tail = rx->last_processed;
if (tail) {
tail->next = bd;
tail->hw_next = bd->dma;
}
core_rxirq_enable(tibase, rx->index + 1);
/* BDs live in DMA-coherent memory, but writes might be pending */
cpu_drain_writebuffer();
/* REVISIT specs say to write this AFTER the BUFCNT register
* below ... but that loses badly.
*/
musb_writel(&rx_ram->rx_head, 0, bd->dma);
/* bufferCount must be at least 3, and zeroes on completion
* unless it underflows below zero, or stops at two, or keeps
* growing ... grr.
*/
i = musb_readl(tibase,
DAVINCI_RXCPPI_BUFCNT0_REG + (rx->index * 4))
& 0xffff;
if (!i)
musb_writel(tibase,
DAVINCI_RXCPPI_BUFCNT0_REG + (rx->index * 4),
n_bds + 2);
else if (n_bds > (i - 3))
musb_writel(tibase,
DAVINCI_RXCPPI_BUFCNT0_REG + (rx->index * 4),
n_bds - (i - 3));
i = musb_readl(tibase,
DAVINCI_RXCPPI_BUFCNT0_REG + (rx->index * 4))
& 0xffff;
if (i < (2 + n_bds)) {
musb_dbg(musb, "bufcnt%d underrun - %d (for %d)",
rx->index, i, n_bds);
musb_writel(tibase,
DAVINCI_RXCPPI_BUFCNT0_REG + (rx->index * 4),
n_bds + 2);
}
cppi_dump_rx(4, rx, "/S");
}
/**
* cppi_channel_program - program channel for data transfer
* @ch: the channel
* @maxpacket: max packet size
* @mode: For RX, 1 unless the usb protocol driver promised to treat
* all short reads as errors and kick in high level fault recovery.
* For TX, ignored because of RNDIS mode races/glitches.
* @dma_addr: dma address of buffer
* @len: length of buffer
* Context: controller irqlocked
*/
static int cppi_channel_program(struct dma_channel *ch,
u16 maxpacket, u8 mode,
dma_addr_t dma_addr, u32 len)
{
struct cppi_channel *cppi_ch;
struct cppi *controller;
struct musb *musb;
cppi_ch = container_of(ch, struct cppi_channel, channel);
controller = cppi_ch->controller;
musb = controller->controller.musb;
switch (ch->status) {
case MUSB_DMA_STATUS_BUS_ABORT:
case MUSB_DMA_STATUS_CORE_ABORT:
/* fault irq handler should have handled cleanup */
WARNING("%cX DMA%d not cleaned up after abort!\n",
cppi_ch->transmit ? 'T' : 'R',
cppi_ch->index);
/* WARN_ON(1); */
break;
case MUSB_DMA_STATUS_BUSY:
WARNING("program active channel? %cX DMA%d\n",
cppi_ch->transmit ? 'T' : 'R',
cppi_ch->index);
/* WARN_ON(1); */
break;
case MUSB_DMA_STATUS_UNKNOWN:
musb_dbg(musb, "%cX DMA%d not allocated!",
cppi_ch->transmit ? 'T' : 'R',
cppi_ch->index);
fallthrough;
case MUSB_DMA_STATUS_FREE:
break;
}
ch->status = MUSB_DMA_STATUS_BUSY;
/* set transfer parameters, then queue up its first segment */
cppi_ch->buf_dma = dma_addr;
cppi_ch->offset = 0;
cppi_ch->maxpacket = maxpacket;
cppi_ch->buf_len = len;
cppi_ch->channel.actual_len = 0;
/* TX channel? or RX? */
if (cppi_ch->transmit)
cppi_next_tx_segment(musb, cppi_ch);
else
cppi_next_rx_segment(musb, cppi_ch, mode);
return true;
}
static bool cppi_rx_scan(struct cppi *cppi, unsigned ch)
{
struct cppi_channel *rx = &cppi->rx[ch];
struct cppi_rx_stateram __iomem *state = rx->state_ram;
struct cppi_descriptor *bd;
struct cppi_descriptor *last = rx->last_processed;
bool completed = false;
bool acked = false;
int i;
dma_addr_t safe2ack;
void __iomem *regs = rx->hw_ep->regs;
struct musb *musb = cppi->controller.musb;
cppi_dump_rx(6, rx, "/K");
bd = last ? last->next : rx->head;
if (!bd)
return false;
/* run through all completed BDs */
for (i = 0, safe2ack = musb_readl(&state->rx_complete, 0);
(safe2ack || completed) && bd && i < NUM_RXCHAN_BD;
i++, bd = bd->next) {
u16 len;
/* catch latest BD writes from CPPI */
rmb();
if (!completed && (bd->hw_options & CPPI_OWN_SET))
break;
musb_dbg(musb, "C/RXBD %llx: nxt %08x buf %08x "
"off.len %08x opt.len %08x (%d)",
(unsigned long long)bd->dma, bd->hw_next, bd->hw_bufp,
bd->hw_off_len, bd->hw_options,
rx->channel.actual_len);
/* actual packet received length */
if ((bd->hw_options & CPPI_SOP_SET) && !completed)
len = bd->hw_off_len & CPPI_RECV_PKTLEN_MASK;
else
len = 0;
if (bd->hw_options & CPPI_EOQ_MASK)
completed = true;
if (!completed && len < bd->buflen) {
/* NOTE: when we get a short packet, RXCSR_H_REQPKT
* must have been cleared, and no more DMA packets may
* active be in the queue... TI docs didn't say, but
* CPPI ignores those BDs even though OWN is still set.
*/
completed = true;
musb_dbg(musb, "rx short %d/%d (%d)",
len, bd->buflen,
rx->channel.actual_len);
}
/* If we got here, we expect to ack at least one BD; meanwhile
* CPPI may completing other BDs while we scan this list...
*
* RACE: we can notice OWN cleared before CPPI raises the
* matching irq by writing that BD as the completion pointer.
* In such cases, stop scanning and wait for the irq, avoiding
* lost acks and states where BD ownership is unclear.
*/
if (bd->dma == safe2ack) {
musb_writel(&state->rx_complete, 0, safe2ack);
safe2ack = musb_readl(&state->rx_complete, 0);
acked = true;
if (bd->dma == safe2ack)
safe2ack = 0;
}
rx->channel.actual_len += len;
cppi_bd_free(rx, last);
last = bd;
/* stop scanning on end-of-segment */
if (bd->hw_next == 0)
completed = true;
}
rx->last_processed = last;
/* dma abort, lost ack, or ... */
if (!acked && last) {
int csr;
if (safe2ack == 0 || safe2ack == rx->last_processed->dma)
musb_writel(&state->rx_complete, 0, safe2ack);
if (safe2ack == 0) {
cppi_bd_free(rx, last);
rx->last_processed = NULL;
/* if we land here on the host side, H_REQPKT will
* be clear and we need to restart the queue...
*/
WARN_ON(rx->head);
}
musb_ep_select(cppi->mregs, rx->index + 1);
csr = musb_readw(regs, MUSB_RXCSR);
if (csr & MUSB_RXCSR_DMAENAB) {
musb_dbg(musb, "list%d %p/%p, last %llx%s, csr %04x",
rx->index,
rx->head, rx->tail,
rx->last_processed
? (unsigned long long)
rx->last_processed->dma
: 0,
completed ? ", completed" : "",
csr);
cppi_dump_rxq(4, "/what?", rx);
}
}
if (!completed) {
int csr;
rx->head = bd;
/* REVISIT seems like "autoreq all but EOP" doesn't...
* setting it here "should" be racey, but seems to work
*/
csr = musb_readw(rx->hw_ep->regs, MUSB_RXCSR);
if (is_host_active(cppi->controller.musb)
&& bd
&& !(csr & MUSB_RXCSR_H_REQPKT)) {
csr |= MUSB_RXCSR_H_REQPKT;
musb_writew(regs, MUSB_RXCSR,
MUSB_RXCSR_H_WZC_BITS | csr);
csr = musb_readw(rx->hw_ep->regs, MUSB_RXCSR);
}
} else {
rx->head = NULL;
rx->tail = NULL;
}
cppi_dump_rx(6, rx, completed ? "/completed" : "/cleaned");
return completed;
}
irqreturn_t cppi_interrupt(int irq, void *dev_id)
{
struct musb *musb = dev_id;
struct cppi *cppi;
void __iomem *tibase;
struct musb_hw_ep *hw_ep = NULL;
u32 rx, tx;
int i, index;
unsigned long flags;
cppi = container_of(musb->dma_controller, struct cppi, controller);
if (cppi->irq)
spin_lock_irqsave(&musb->lock, flags);
tibase = musb->ctrl_base;
tx = musb_readl(tibase, DAVINCI_TXCPPI_MASKED_REG);
rx = musb_readl(tibase, DAVINCI_RXCPPI_MASKED_REG);
if (!tx && !rx) {
if (cppi->irq)
spin_unlock_irqrestore(&musb->lock, flags);
return IRQ_NONE;
}
musb_dbg(musb, "CPPI IRQ Tx%x Rx%x", tx, rx);
/* process TX channels */
for (index = 0; tx; tx = tx >> 1, index++) {
struct cppi_channel *tx_ch;
struct cppi_tx_stateram __iomem *tx_ram;
bool completed = false;
struct cppi_descriptor *bd;
if (!(tx & 1))
continue;
tx_ch = cppi->tx + index;
tx_ram = tx_ch->state_ram;
/* FIXME need a cppi_tx_scan() routine, which
* can also be called from abort code
*/
cppi_dump_tx(5, tx_ch, "/E");
bd = tx_ch->head;
/*
* If Head is null then this could mean that a abort interrupt
* that needs to be acknowledged.
*/
if (NULL == bd) {
musb_dbg(musb, "null BD");
musb_writel(&tx_ram->tx_complete, 0, 0);
continue;
}
/* run through all completed BDs */
for (i = 0; !completed && bd && i < NUM_TXCHAN_BD;
i++, bd = bd->next) {
u16 len;
/* catch latest BD writes from CPPI */
rmb();
if (bd->hw_options & CPPI_OWN_SET)
break;
musb_dbg(musb, "C/TXBD %p n %x b %x off %x opt %x",
bd, bd->hw_next, bd->hw_bufp,
bd->hw_off_len, bd->hw_options);
len = bd->hw_off_len & CPPI_BUFFER_LEN_MASK;
tx_ch->channel.actual_len += len;
tx_ch->last_processed = bd;
/* write completion register to acknowledge
* processing of completed BDs, and possibly
* release the IRQ; EOQ might not be set ...
*
* REVISIT use the same ack strategy as rx
*
* REVISIT have observed bit 18 set; huh??
*/
/* if ((bd->hw_options & CPPI_EOQ_MASK)) */
musb_writel(&tx_ram->tx_complete, 0, bd->dma);
/* stop scanning on end-of-segment */
if (bd->hw_next == 0)
completed = true;
}
/* on end of segment, maybe go to next one */
if (completed) {
/* cppi_dump_tx(4, tx_ch, "/complete"); */
/* transfer more, or report completion */
if (tx_ch->offset >= tx_ch->buf_len) {
tx_ch->head = NULL;
tx_ch->tail = NULL;
tx_ch->channel.status = MUSB_DMA_STATUS_FREE;
hw_ep = tx_ch->hw_ep;
musb_dma_completion(musb, index + 1, 1);
} else {
/* Bigger transfer than we could fit in
* that first batch of descriptors...
*/
cppi_next_tx_segment(musb, tx_ch);
}
} else
tx_ch->head = bd;
}
/* Start processing the RX block */
for (index = 0; rx; rx = rx >> 1, index++) {
if (rx & 1) {
struct cppi_channel *rx_ch;
rx_ch = cppi->rx + index;
/* let incomplete dma segments finish */
if (!cppi_rx_scan(cppi, index))
continue;
/* start another dma segment if needed */
if (rx_ch->channel.actual_len != rx_ch->buf_len
&& rx_ch->channel.actual_len
== rx_ch->offset) {
cppi_next_rx_segment(musb, rx_ch, 1);
continue;
}
/* all segments completed! */
rx_ch->channel.status = MUSB_DMA_STATUS_FREE;
hw_ep = rx_ch->hw_ep;
core_rxirq_disable(tibase, index + 1);
musb_dma_completion(musb, index + 1, 0);
}
}
/* write to CPPI EOI register to re-enable interrupts */
musb_writel(tibase, DAVINCI_CPPI_EOI_REG, 0);
if (cppi->irq)
spin_unlock_irqrestore(&musb->lock, flags);
return IRQ_HANDLED;
}
EXPORT_SYMBOL_GPL(cppi_interrupt);
/* Instantiate a software object representing a DMA controller. */
struct dma_controller *
cppi_dma_controller_create(struct musb *musb, void __iomem *mregs)
{
struct cppi *controller;
struct device *dev = musb->controller;
struct platform_device *pdev = to_platform_device(dev);
int irq = platform_get_irq_byname(pdev, "dma");
controller = kzalloc(sizeof *controller, GFP_KERNEL);
if (!controller)
return NULL;
controller->mregs = mregs;
controller->tibase = mregs - DAVINCI_BASE_OFFSET;
controller->controller.musb = musb;
controller->controller.channel_alloc = cppi_channel_allocate;
controller->controller.channel_release = cppi_channel_release;
controller->controller.channel_program = cppi_channel_program;
controller->controller.channel_abort = cppi_channel_abort;
/* NOTE: allocating from on-chip SRAM would give the least
* contention for memory access, if that ever matters here.
*/
/* setup BufferPool */
controller->pool = dma_pool_create("cppi",
controller->controller.musb->controller,
sizeof(struct cppi_descriptor),
CPPI_DESCRIPTOR_ALIGN, 0);
if (!controller->pool) {
kfree(controller);
return NULL;
}
if (irq > 0) {
if (request_irq(irq, cppi_interrupt, 0, "cppi-dma", musb)) {
dev_err(dev, "request_irq %d failed!\n", irq);
musb_dma_controller_destroy(&controller->controller);
return NULL;
}
controller->irq = irq;
}
cppi_controller_start(controller);
return &controller->controller;
}
EXPORT_SYMBOL_GPL(cppi_dma_controller_create);
/*
* Destroy a previously-instantiated DMA controller.
*/
void cppi_dma_controller_destroy(struct dma_controller *c)
{
struct cppi *cppi;
cppi = container_of(c, struct cppi, controller);
cppi_controller_stop(cppi);
if (cppi->irq)
free_irq(cppi->irq, cppi->controller.musb);
/* assert: caller stopped the controller first */
dma_pool_destroy(cppi->pool);
kfree(cppi);
}
EXPORT_SYMBOL_GPL(cppi_dma_controller_destroy);
/*
* Context: controller irqlocked, endpoint selected
*/
static int cppi_channel_abort(struct dma_channel *channel)
{
struct cppi_channel *cppi_ch;
struct cppi *controller;
void __iomem *mbase;
void __iomem *tibase;
void __iomem *regs;
u32 value;
struct cppi_descriptor *queue;
cppi_ch = container_of(channel, struct cppi_channel, channel);
controller = cppi_ch->controller;
switch (channel->status) {
case MUSB_DMA_STATUS_BUS_ABORT:
case MUSB_DMA_STATUS_CORE_ABORT:
/* from RX or TX fault irq handler */
case MUSB_DMA_STATUS_BUSY:
/* the hardware needs shutting down */
regs = cppi_ch->hw_ep->regs;
break;
case MUSB_DMA_STATUS_UNKNOWN:
case MUSB_DMA_STATUS_FREE:
return 0;
default:
return -EINVAL;
}
if (!cppi_ch->transmit && cppi_ch->head)
cppi_dump_rxq(3, "/abort", cppi_ch);
mbase = controller->mregs;
tibase = controller->tibase;
queue = cppi_ch->head;
cppi_ch->head = NULL;
cppi_ch->tail = NULL;
/* REVISIT should rely on caller having done this,
* and caller should rely on us not changing it.
* peripheral code is safe ... check host too.
*/
musb_ep_select(mbase, cppi_ch->index + 1);
if (cppi_ch->transmit) {
struct cppi_tx_stateram __iomem *tx_ram;
/* REVISIT put timeouts on these controller handshakes */
cppi_dump_tx(6, cppi_ch, " (teardown)");
/* teardown DMA engine then usb core */
do {
value = musb_readl(tibase, DAVINCI_TXCPPI_TEAR_REG);
} while (!(value & CPPI_TEAR_READY));
musb_writel(tibase, DAVINCI_TXCPPI_TEAR_REG, cppi_ch->index);
tx_ram = cppi_ch->state_ram;
do {
value = musb_readl(&tx_ram->tx_complete, 0);
} while (0xFFFFFFFC != value);
/* FIXME clean up the transfer state ... here?
* the completion routine should get called with
* an appropriate status code.
*/
value = musb_readw(regs, MUSB_TXCSR);
value &= ~MUSB_TXCSR_DMAENAB;
value |= MUSB_TXCSR_FLUSHFIFO;
musb_writew(regs, MUSB_TXCSR, value);
musb_writew(regs, MUSB_TXCSR, value);
/*
* 1. Write to completion Ptr value 0x1(bit 0 set)
* (write back mode)
* 2. Wait for abort interrupt and then put the channel in
* compare mode by writing 1 to the tx_complete register.
*/
cppi_reset_tx(tx_ram, 1);
cppi_ch->head = NULL;
musb_writel(&tx_ram->tx_complete, 0, 1);
cppi_dump_tx(5, cppi_ch, " (done teardown)");
/* REVISIT tx side _should_ clean up the same way
* as the RX side ... this does no cleanup at all!
*/
} else /* RX */ {
u16 csr;
/* NOTE: docs don't guarantee any of this works ... we
* expect that if the usb core stops telling the cppi core
* to pull more data from it, then it'll be safe to flush
* current RX DMA state iff any pending fifo transfer is done.
*/
core_rxirq_disable(tibase, cppi_ch->index + 1);
/* for host, ensure ReqPkt is never set again */
if (is_host_active(cppi_ch->controller->controller.musb)) {
value = musb_readl(tibase, DAVINCI_AUTOREQ_REG);
value &= ~((0x3) << (cppi_ch->index * 2));
musb_writel(tibase, DAVINCI_AUTOREQ_REG, value);
}
csr = musb_readw(regs, MUSB_RXCSR);
/* for host, clear (just) ReqPkt at end of current packet(s) */
if (is_host_active(cppi_ch->controller->controller.musb)) {
csr |= MUSB_RXCSR_H_WZC_BITS;
csr &= ~MUSB_RXCSR_H_REQPKT;
} else
csr |= MUSB_RXCSR_P_WZC_BITS;
/* clear dma enable */
csr &= ~(MUSB_RXCSR_DMAENAB);
musb_writew(regs, MUSB_RXCSR, csr);
csr = musb_readw(regs, MUSB_RXCSR);
/* Quiesce: wait for current dma to finish (if not cleanup).
* We can't use bit zero of stateram->rx_sop, since that
* refers to an entire "DMA packet" not just emptying the
* current fifo. Most segments need multiple usb packets.
*/
if (channel->status == MUSB_DMA_STATUS_BUSY)
udelay(50);
/* scan the current list, reporting any data that was
* transferred and acking any IRQ
*/
cppi_rx_scan(controller, cppi_ch->index);
/* clobber the existing state once it's idle
*
* NOTE: arguably, we should also wait for all the other
* RX channels to quiesce (how??) and then temporarily
* disable RXCPPI_CTRL_REG ... but it seems that we can
* rely on the controller restarting from state ram, with
* only RXCPPI_BUFCNT state being bogus. BUFCNT will
* correct itself after the next DMA transfer though.
*
* REVISIT does using rndis mode change that?
*/
cppi_reset_rx(cppi_ch->state_ram);
/* next DMA request _should_ load cppi head ptr */
/* ... we don't "free" that list, only mutate it in place. */
cppi_dump_rx(5, cppi_ch, " (done abort)");
/* clean up previously pending bds */
cppi_bd_free(cppi_ch, cppi_ch->last_processed);
cppi_ch->last_processed = NULL;
while (queue) {
struct cppi_descriptor *tmp = queue->next;
cppi_bd_free(cppi_ch, queue);
queue = tmp;
}
}
channel->status = MUSB_DMA_STATUS_FREE;
cppi_ch->buf_dma = 0;
cppi_ch->offset = 0;
cppi_ch->buf_len = 0;
cppi_ch->maxpacket = 0;
return 0;
}
/* TBD Queries:
*
* Power Management ... probably turn off cppi during suspend, restart;
* check state ram? Clocking is presumably shared with usb core.
*/
drivers/usb/musb/davinci.c deleted 100644 → 0
View file @ a84436a9
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2005-2006 by Texas Instruments
*
* This file is part of the Inventra Controller Driver for Linux.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/list.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/gpio/consumer.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/usb/usb_phy_generic.h>
#include <mach/cputype.h>
#include <mach/hardware.h>
#include <asm/mach-types.h>
#include "musb_core.h"
#include "davinci.h"
#include "cppi_dma.h"
#define USB_PHY_CTRL IO_ADDRESS(USBPHY_CTL_PADDR)
#define DM355_DEEPSLEEP IO_ADDRESS(DM355_DEEPSLEEP_PADDR)
struct davinci_glue {
struct device *dev;
struct platform_device *musb;
struct clk *clk;
bool vbus_state;
struct gpio_desc *vbus;
struct work_struct vbus_work;
};
/* REVISIT (PM) we should be able to keep the PHY in low power mode most
* of the time (24 MHZ oscillator and PLL off, etc) by setting POWER.D0
* and, when in host mode, autosuspending idle root ports... PHYPLLON
* (overriding SUSPENDM?) then likely needs to stay off.
*/
static inline void phy_on(void)
{
u32 phy_ctrl = __raw_readl(USB_PHY_CTRL);
/* power everything up; start the on-chip PHY and its PLL */
phy_ctrl &= ~(USBPHY_OSCPDWN | USBPHY_OTGPDWN | USBPHY_PHYPDWN);
phy_ctrl |= USBPHY_SESNDEN | USBPHY_VBDTCTEN | USBPHY_PHYPLLON;
__raw_writel(phy_ctrl, USB_PHY_CTRL);
/* wait for PLL to lock before proceeding */
while ((__raw_readl(USB_PHY_CTRL) & USBPHY_PHYCLKGD) == 0)
cpu_relax();
}
static inline void phy_off(void)
{
u32 phy_ctrl = __raw_readl(USB_PHY_CTRL);
/* powerdown the on-chip PHY, its PLL, and the OTG block */
phy_ctrl &= ~(USBPHY_SESNDEN | USBPHY_VBDTCTEN | USBPHY_PHYPLLON);
phy_ctrl |= USBPHY_OSCPDWN | USBPHY_OTGPDWN | USBPHY_PHYPDWN;
__raw_writel(phy_ctrl, USB_PHY_CTRL);
}
static int dma_off = 1;
static void davinci_musb_enable(struct musb *musb)
{
u32 tmp, old, val;
/* workaround: setup irqs through both register sets */
tmp = (musb->epmask & DAVINCI_USB_TX_ENDPTS_MASK)
<< DAVINCI_USB_TXINT_SHIFT;
musb_writel(musb->ctrl_base, DAVINCI_USB_INT_MASK_SET_REG, tmp);
old = tmp;
tmp = (musb->epmask & (0xfffe & DAVINCI_USB_RX_ENDPTS_MASK))
<< DAVINCI_USB_RXINT_SHIFT;
musb_writel(musb->ctrl_base, DAVINCI_USB_INT_MASK_SET_REG, tmp);
tmp |= old;
val = ~MUSB_INTR_SOF;
tmp |= ((val & 0x01ff) << DAVINCI_USB_USBINT_SHIFT);
musb_writel(musb->ctrl_base, DAVINCI_USB_INT_MASK_SET_REG, tmp);
if (is_dma_capable() && !dma_off)
printk(KERN_WARNING "%s %s: dma not reactivated\n",
__FILE__, __func__);
else
dma_off = 0;
/* force a DRVVBUS irq so we can start polling for ID change */
musb_writel(musb->ctrl_base, DAVINCI_USB_INT_SET_REG,
DAVINCI_INTR_DRVVBUS << DAVINCI_USB_USBINT_SHIFT);
}
/*
* Disable the HDRC and flush interrupts
*/
static void davinci_musb_disable(struct musb *musb)
{
/* because we don't set CTRLR.UINT, "important" to:
* - not read/write INTRUSB/INTRUSBE
* - (except during initial setup, as workaround)
* - use INTSETR/INTCLRR instead
*/
musb_writel(musb->ctrl_base, DAVINCI_USB_INT_MASK_CLR_REG,
DAVINCI_USB_USBINT_MASK
| DAVINCI_USB_TXINT_MASK
| DAVINCI_USB_RXINT_MASK);
musb_writel(musb->ctrl_base, DAVINCI_USB_EOI_REG, 0);
if (is_dma_capable() && !dma_off)
WARNING("dma still active\n");
}
#define portstate(stmt) stmt
/*
* VBUS SWITCHING IS BOARD-SPECIFIC ... at least for the DM6446 EVM,
* which doesn't wire DRVVBUS to the FET that switches it. Unclear
* if that's a problem with the DM6446 chip or just with that board.
*
* In either case, the DM355 EVM automates DRVVBUS the normal way,
* when J10 is out, and TI documents it as handling OTG.
*/
/* I2C operations are always synchronous, and require a task context.
* With unloaded systems, using the shared workqueue seems to suffice
* to satisfy the 100msec A_WAIT_VRISE timeout...
*/
static void evm_deferred_drvvbus(struct work_struct *work)
{
struct davinci_glue *glue = container_of(work, struct davinci_glue,
vbus_work);
gpiod_set_value_cansleep(glue->vbus, glue->vbus_state);
glue->vbus_state = !glue->vbus_state;
}
static void davinci_musb_source_power(struct musb *musb, int is_on,
int immediate)
{
struct davinci_glue *glue = dev_get_drvdata(musb->controller->parent);
/* This GPIO handling is entirely optional */
if (!glue->vbus)
return;
if (is_on)
is_on = 1;
if (glue->vbus_state == is_on)
return;
/* 0/1 vs "-1 == unknown/init" */
glue->vbus_state = !is_on;
if (machine_is_davinci_evm()) {
if (immediate)
gpiod_set_value_cansleep(glue->vbus, glue->vbus_state);
else
schedule_work(&glue->vbus_work);
}
if (immediate)
glue->vbus_state = is_on;
}
static void davinci_musb_set_vbus(struct musb *musb, int is_on)
{
WARN_ON(is_on && is_peripheral_active(musb));
davinci_musb_source_power(musb, is_on, 0);
}
#define POLL_SECONDS 2
static void otg_timer(struct timer_list *t)
{
struct musb *musb = from_timer(musb, t, dev_timer);
void __iomem *mregs = musb->mregs;
u8 devctl;
unsigned long flags;
/* We poll because DaVinci's won't expose several OTG-critical
* status change events (from the transceiver) otherwise.
*/
devctl = musb_readb(mregs, MUSB_DEVCTL);
dev_dbg(musb->controller, "poll devctl %02x (%s)\n", devctl,
usb_otg_state_string(musb->xceiv->otg->state));
spin_lock_irqsave(&musb->lock, flags);
switch (musb->xceiv->otg->state) {
case OTG_STATE_A_WAIT_VFALL:
/* Wait till VBUS falls below SessionEnd (~0.2V); the 1.3 RTL
* seems to mis-handle session "start" otherwise (or in our
* case "recover"), in routine "VBUS was valid by the time
* VBUSERR got reported during enumeration" cases.
*/
if (devctl & MUSB_DEVCTL_VBUS) {
mod_timer(&musb->dev_timer, jiffies + POLL_SECONDS * HZ);
break;
}
musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
musb_writel(musb->ctrl_base, DAVINCI_USB_INT_SET_REG,
MUSB_INTR_VBUSERROR << DAVINCI_USB_USBINT_SHIFT);
break;
case OTG_STATE_B_IDLE:
/*
* There's no ID-changed IRQ, so we have no good way to tell
* when to switch to the A-Default state machine (by setting
* the DEVCTL.SESSION flag).
*
* Workaround: whenever we're in B_IDLE, try setting the
* session flag every few seconds. If it works, ID was
* grounded and we're now in the A-Default state machine.
*
* NOTE setting the session flag is _supposed_ to trigger
* SRP, but clearly it doesn't.
*/
musb_writeb(mregs, MUSB_DEVCTL,
devctl | MUSB_DEVCTL_SESSION);
devctl = musb_readb(mregs, MUSB_DEVCTL);
if (devctl & MUSB_DEVCTL_BDEVICE)
mod_timer(&musb->dev_timer, jiffies + POLL_SECONDS * HZ);
else
musb->xceiv->otg->state = OTG_STATE_A_IDLE;
break;
default:
break;
}
spin_unlock_irqrestore(&musb->lock, flags);
}
static irqreturn_t davinci_musb_interrupt(int irq, void *__hci)
{
unsigned long flags;
irqreturn_t retval = IRQ_NONE;
struct musb *musb = __hci;
struct usb_otg *otg = musb->xceiv->otg;
void __iomem *tibase = musb->ctrl_base;
struct cppi *cppi;
u32 tmp;
spin_lock_irqsave(&musb->lock, flags);
/* NOTE: DaVinci shadows the Mentor IRQs. Don't manage them through
* the Mentor registers (except for setup), use the TI ones and EOI.
*
* Docs describe irq "vector" registers associated with the CPPI and
* USB EOI registers. These hold a bitmask corresponding to the
* current IRQ, not an irq handler address. Would using those bits
* resolve some of the races observed in this dispatch code??
*/
/* CPPI interrupts share the same IRQ line, but have their own
* mask, state, "vector", and EOI registers.
*/
cppi = container_of(musb->dma_controller, struct cppi, controller);
if (is_cppi_enabled(musb) && musb->dma_controller && !cppi->irq)
retval = cppi_interrupt(irq, __hci);
/* ack and handle non-CPPI interrupts */
tmp = musb_readl(tibase, DAVINCI_USB_INT_SRC_MASKED_REG);
musb_writel(tibase, DAVINCI_USB_INT_SRC_CLR_REG, tmp);
dev_dbg(musb->controller, "IRQ %08x\n", tmp);
musb->int_rx = (tmp & DAVINCI_USB_RXINT_MASK)
>> DAVINCI_USB_RXINT_SHIFT;
musb->int_tx = (tmp & DAVINCI_USB_TXINT_MASK)
>> DAVINCI_USB_TXINT_SHIFT;
musb->int_usb = (tmp & DAVINCI_USB_USBINT_MASK)
>> DAVINCI_USB_USBINT_SHIFT;
/* DRVVBUS irqs are the only proxy we have (a very poor one!) for
* DaVinci's missing ID change IRQ. We need an ID change IRQ to
* switch appropriately between halves of the OTG state machine.
* Managing DEVCTL.SESSION per Mentor docs requires we know its
* value, but DEVCTL.BDEVICE is invalid without DEVCTL.SESSION set.
* Also, DRVVBUS pulses for SRP (but not at 5V) ...
*/
if (tmp & (DAVINCI_INTR_DRVVBUS << DAVINCI_USB_USBINT_SHIFT)) {
int drvvbus = musb_readl(tibase, DAVINCI_USB_STAT_REG);
void __iomem *mregs = musb->mregs;
u8 devctl = musb_readb(mregs, MUSB_DEVCTL);
int err = musb->int_usb & MUSB_INTR_VBUSERROR;
err = musb->int_usb & MUSB_INTR_VBUSERROR;
if (err) {
/* The Mentor core doesn't debounce VBUS as needed
* to cope with device connect current spikes. This
* means it's not uncommon for bus-powered devices
* to get VBUS errors during enumeration.
*
* This is a workaround, but newer RTL from Mentor
* seems to allow a better one: "re"starting sessions
* without waiting (on EVM, a **long** time) for VBUS
* to stop registering in devctl.
*/
musb->int_usb &= ~MUSB_INTR_VBUSERROR;
musb->xceiv->otg->state = OTG_STATE_A_WAIT_VFALL;
mod_timer(&musb->dev_timer, jiffies + POLL_SECONDS * HZ);
WARNING("VBUS error workaround (delay coming)\n");
} else if (drvvbus) {
MUSB_HST_MODE(musb);
musb->xceiv->otg->state = OTG_STATE_A_WAIT_VRISE;
portstate(musb->port1_status |= USB_PORT_STAT_POWER);
del_timer(&musb->dev_timer);
} else {
musb->is_active = 0;
MUSB_DEV_MODE(musb);
musb->xceiv->otg->state = OTG_STATE_B_IDLE;
portstate(musb->port1_status &= ~USB_PORT_STAT_POWER);
}
/* NOTE: this must complete poweron within 100 msec
* (OTG_TIME_A_WAIT_VRISE) but we don't check for that.
*/
davinci_musb_source_power(musb, drvvbus, 0);
dev_dbg(musb->controller, "VBUS %s (%s)%s, devctl %02x\n",
drvvbus ? "on" : "off",
usb_otg_state_string(musb->xceiv->otg->state),
err ? " ERROR" : "",
devctl);
retval = IRQ_HANDLED;
}
if (musb->int_tx || musb->int_rx || musb->int_usb)
retval |= musb_interrupt(musb);
/* irq stays asserted until EOI is written */
musb_writel(tibase, DAVINCI_USB_EOI_REG, 0);
/* poll for ID change */
if (musb->xceiv->otg->state == OTG_STATE_B_IDLE)
mod_timer(&musb->dev_timer, jiffies + POLL_SECONDS * HZ);
spin_unlock_irqrestore(&musb->lock, flags);
return retval;
}
static int davinci_musb_set_mode(struct musb *musb, u8 mode)
{
/* EVM can't do this (right?) */
return -EIO;
}
static int davinci_musb_init(struct musb *musb)
{
void __iomem *tibase = musb->ctrl_base;
u32 revision;
int ret = -ENODEV;
musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
if (IS_ERR_OR_NULL(musb->xceiv)) {
ret = -EPROBE_DEFER;
goto unregister;
}
musb->mregs += DAVINCI_BASE_OFFSET;
/* returns zero if e.g. not clocked */
revision = musb_readl(tibase, DAVINCI_USB_VERSION_REG);
if (revision == 0)
goto fail;
timer_setup(&musb->dev_timer, otg_timer, 0);
davinci_musb_source_power(musb, 0, 1);
/* dm355 EVM swaps D+/D- for signal integrity, and
* is clocked from the main 24 MHz crystal.
*/
if (machine_is_davinci_dm355_evm()) {
u32 phy_ctrl = __raw_readl(USB_PHY_CTRL);
phy_ctrl &= ~(3 << 9);
phy_ctrl |= USBPHY_DATAPOL;
__raw_writel(phy_ctrl, USB_PHY_CTRL);
}
/* On dm355, the default-A state machine needs DRVVBUS control.
* If we won't be a host, there's no need to turn it on.
*/
if (cpu_is_davinci_dm355()) {
u32 deepsleep = __raw_readl(DM355_DEEPSLEEP);
deepsleep &= ~DRVVBUS_FORCE;
__raw_writel(deepsleep, DM355_DEEPSLEEP);
}
/* reset the controller */
musb_writel(tibase, DAVINCI_USB_CTRL_REG, 0x1);
/* start the on-chip PHY and its PLL */
phy_on();
msleep(5);
/* NOTE: irqs are in mixed mode, not bypass to pure-musb */
pr_debug("DaVinci OTG revision %08x phy %03x control %02x\n",
revision, __raw_readl(USB_PHY_CTRL),
musb_readb(tibase, DAVINCI_USB_CTRL_REG));
musb->isr = davinci_musb_interrupt;
return 0;
fail:
usb_put_phy(musb->xceiv);
unregister:
usb_phy_generic_unregister();
return ret;
}
static int davinci_musb_exit(struct musb *musb)
{
int maxdelay = 30;
u8 devctl, warn = 0;
del_timer_sync(&musb->dev_timer);
/* force VBUS off */
if (cpu_is_davinci_dm355()) {
u32 deepsleep = __raw_readl(DM355_DEEPSLEEP);
deepsleep &= ~DRVVBUS_FORCE;
deepsleep |= DRVVBUS_OVERRIDE;
__raw_writel(deepsleep, DM355_DEEPSLEEP);
}
davinci_musb_source_power(musb, 0 /*off*/, 1);
/*
* delay, to avoid problems with module reload.
* if there's no peripheral connected, this can take a
* long time to fall, especially on EVM with huge C133.
*/
do {
devctl = musb_readb(musb->mregs, MUSB_DEVCTL);
if (!(devctl & MUSB_DEVCTL_VBUS))
break;
if ((devctl & MUSB_DEVCTL_VBUS) != warn) {
warn = devctl & MUSB_DEVCTL_VBUS;
dev_dbg(musb->controller, "VBUS %d\n",
warn >> MUSB_DEVCTL_VBUS_SHIFT);
}
msleep(1000);
maxdelay--;
} while (maxdelay > 0);
/* in OTG mode, another host might be connected */
if (devctl & MUSB_DEVCTL_VBUS)
dev_dbg(musb->controller, "VBUS off timeout (devctl %02x)\n", devctl);
phy_off();
usb_put_phy(musb->xceiv);
return 0;
}
static const struct musb_platform_ops davinci_ops = {
.quirks = MUSB_DMA_CPPI,
.init = davinci_musb_init,
.exit = davinci_musb_exit,
#ifdef CONFIG_USB_TI_CPPI_DMA
.dma_init = cppi_dma_controller_create,
.dma_exit = cppi_dma_controller_destroy,
#endif
.enable = davinci_musb_enable,
.disable = davinci_musb_disable,
.set_mode = davinci_musb_set_mode,
.set_vbus = davinci_musb_set_vbus,
};
static const struct platform_device_info davinci_dev_info = {
.name = "musb-hdrc",
.id = PLATFORM_DEVID_AUTO,
.dma_mask = DMA_BIT_MASK(32),
};
static int davinci_probe(struct platform_device *pdev)
{
struct resource musb_resources[3];
struct musb_hdrc_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct platform_device *musb;
struct davinci_glue *glue;
struct platform_device_info pinfo;
struct clk *clk;
int ret = -ENOMEM;
glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
if (!glue)
goto err0;
clk = devm_clk_get(&pdev->dev, "usb");
if (IS_ERR(clk)) {
dev_err(&pdev->dev, "failed to get clock\n");
ret = PTR_ERR(clk);
goto err0;
}
ret = clk_enable(clk);
if (ret) {
dev_err(&pdev->dev, "failed to enable clock\n");
goto err0;
}
glue->dev = &pdev->dev;
glue->clk = clk;
pdata->platform_ops = &davinci_ops;
glue->vbus = devm_gpiod_get_optional(&pdev->dev, NULL, GPIOD_OUT_LOW);
if (IS_ERR(glue->vbus)) {
ret = PTR_ERR(glue->vbus);
goto err0;
} else {
glue->vbus_state = -1;
INIT_WORK(&glue->vbus_work, evm_deferred_drvvbus);
}
usb_phy_generic_register();
platform_set_drvdata(pdev, glue);
memset(musb_resources, 0x00, sizeof(*musb_resources) *
ARRAY_SIZE(musb_resources));
musb_resources[0].name = pdev->resource[0].name;
musb_resources[0].start = pdev->resource[0].start;
musb_resources[0].end = pdev->resource[0].end;
musb_resources[0].flags = pdev->resource[0].flags;
musb_resources[1].name = pdev->resource[1].name;
musb_resources[1].start = pdev->resource[1].start;
musb_resources[1].end = pdev->resource[1].end;
musb_resources[1].flags = pdev->resource[1].flags;
/*
* For DM6467 3 resources are passed. A placeholder for the 3rd
* resource is always there, so it's safe to always copy it...
*/
musb_resources[2].name = pdev->resource[2].name;
musb_resources[2].start = pdev->resource[2].start;
musb_resources[2].end = pdev->resource[2].end;
musb_resources[2].flags = pdev->resource[2].flags;
pinfo = davinci_dev_info;
pinfo.parent = &pdev->dev;
pinfo.res = musb_resources;
pinfo.num_res = ARRAY_SIZE(musb_resources);
pinfo.data = pdata;
pinfo.size_data = sizeof(*pdata);
glue->musb = musb = platform_device_register_full(&pinfo);
if (IS_ERR(musb)) {
ret = PTR_ERR(musb);
dev_err(&pdev->dev, "failed to register musb device: %d\n", ret);
goto err1;
}
return 0;
err1:
clk_disable(clk);
err0:
return ret;
}
static int davinci_remove(struct platform_device *pdev)
{
struct davinci_glue *glue = platform_get_drvdata(pdev);
platform_device_unregister(glue->musb);
usb_phy_generic_unregister();
clk_disable(glue->clk);
return 0;
}
static struct platform_driver davinci_driver = {
.probe = davinci_probe,
.remove = davinci_remove,
.driver = {
.name = "musb-davinci",
},
};
MODULE_DESCRIPTION("DaVinci MUSB Glue Layer");
MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
MODULE_LICENSE("GPL v2");
module_platform_driver(davinci_driver);
drivers/usb/musb/davinci.h deleted 100644 → 0
View file @ a84436a9
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2005-2006 by Texas Instruments
*/
#ifndef __MUSB_HDRDF_H__
#define __MUSB_HDRDF_H__
/*
* DaVinci-specific definitions
*/
/* Integrated highspeed/otg PHY */
#define USBPHY_CTL_PADDR 0x01c40034
#define USBPHY_DATAPOL BIT(11) /* (dm355) switch D+/D- */
#define USBPHY_PHYCLKGD BIT(8)
#define USBPHY_SESNDEN BIT(7) /* v(sess_end) comparator */
#define USBPHY_VBDTCTEN BIT(6) /* v(bus) comparator */
#define USBPHY_VBUSSENS BIT(5) /* (dm355,ro) is vbus > 0.5V */
#define USBPHY_PHYPLLON BIT(4) /* override pll suspend */
#define USBPHY_CLKO1SEL BIT(3)
#define USBPHY_OSCPDWN BIT(2)
#define USBPHY_OTGPDWN BIT(1)
#define USBPHY_PHYPDWN BIT(0)
#define DM355_DEEPSLEEP_PADDR 0x01c40048
#define DRVVBUS_FORCE BIT(2)
#define DRVVBUS_OVERRIDE BIT(1)
/* For now include usb OTG module registers here */
#define DAVINCI_USB_VERSION_REG 0x00
#define DAVINCI_USB_CTRL_REG 0x04
#define DAVINCI_USB_STAT_REG 0x08
#define DAVINCI_RNDIS_REG 0x10
#define DAVINCI_AUTOREQ_REG 0x14
#define DAVINCI_USB_INT_SOURCE_REG 0x20
#define DAVINCI_USB_INT_SET_REG 0x24
#define DAVINCI_USB_INT_SRC_CLR_REG 0x28
#define DAVINCI_USB_INT_MASK_REG 0x2c
#define DAVINCI_USB_INT_MASK_SET_REG 0x30
#define DAVINCI_USB_INT_MASK_CLR_REG 0x34
#define DAVINCI_USB_INT_SRC_MASKED_REG 0x38
#define DAVINCI_USB_EOI_REG 0x3c
#define DAVINCI_USB_EOI_INTVEC 0x40
/* BEGIN CPPI-generic (?) */
/* CPPI related registers */
#define DAVINCI_TXCPPI_CTRL_REG 0x80
#define DAVINCI_TXCPPI_TEAR_REG 0x84
#define DAVINCI_CPPI_EOI_REG 0x88
#define DAVINCI_CPPI_INTVEC_REG 0x8c
#define DAVINCI_TXCPPI_MASKED_REG 0x90
#define DAVINCI_TXCPPI_RAW_REG 0x94
#define DAVINCI_TXCPPI_INTENAB_REG 0x98
#define DAVINCI_TXCPPI_INTCLR_REG 0x9c
#define DAVINCI_RXCPPI_CTRL_REG 0xC0
#define DAVINCI_RXCPPI_MASKED_REG 0xD0
#define DAVINCI_RXCPPI_RAW_REG 0xD4
#define DAVINCI_RXCPPI_INTENAB_REG 0xD8
#define DAVINCI_RXCPPI_INTCLR_REG 0xDC
#define DAVINCI_RXCPPI_BUFCNT0_REG 0xE0
#define DAVINCI_RXCPPI_BUFCNT1_REG 0xE4
#define DAVINCI_RXCPPI_BUFCNT2_REG 0xE8
#define DAVINCI_RXCPPI_BUFCNT3_REG 0xEC
/* CPPI state RAM entries */
#define DAVINCI_CPPI_STATERAM_BASE_OFFSET 0x100
#define DAVINCI_TXCPPI_STATERAM_OFFSET(chnum) \
(DAVINCI_CPPI_STATERAM_BASE_OFFSET + ((chnum) * 0x40))
#define DAVINCI_RXCPPI_STATERAM_OFFSET(chnum) \
(DAVINCI_CPPI_STATERAM_BASE_OFFSET + 0x20 + ((chnum) * 0x40))
/* CPPI masks */
#define DAVINCI_DMA_CTRL_ENABLE 1
#define DAVINCI_DMA_CTRL_DISABLE 0
#define DAVINCI_DMA_ALL_CHANNELS_ENABLE 0xF
#define DAVINCI_DMA_ALL_CHANNELS_DISABLE 0xF
/* END CPPI-generic (?) */
#define DAVINCI_USB_TX_ENDPTS_MASK 0x1f /* ep0 + 4 tx */
#define DAVINCI_USB_RX_ENDPTS_MASK 0x1e /* 4 rx */
#define DAVINCI_USB_USBINT_SHIFT 16
#define DAVINCI_USB_TXINT_SHIFT 0
#define DAVINCI_USB_RXINT_SHIFT 8
#define DAVINCI_INTR_DRVVBUS 0x0100
#define DAVINCI_USB_USBINT_MASK 0x01ff0000 /* 8 Mentor, DRVVBUS */
#define DAVINCI_USB_TXINT_MASK \
(DAVINCI_USB_TX_ENDPTS_MASK << DAVINCI_USB_TXINT_SHIFT)
#define DAVINCI_USB_RXINT_MASK \
(DAVINCI_USB_RX_ENDPTS_MASK << DAVINCI_USB_RXINT_SHIFT)
#define DAVINCI_BASE_OFFSET 0x400
#endif /* __MUSB_HDRDF_H__ */
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