mirror of
https://github.com/torvalds/linux.git
synced 2024-11-15 00:21:59 +00:00
eb44cef954
Remove unused-but-set devctl variable. Signed-off-by: Paul Cercueil <paul@crapouillou.net> Link: https://lore.kernel.org/r/20210123142502.16980-3-paul@crapouillou.net Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
456 lines
12 KiB
C
456 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* MUSB OTG driver - support for Mentor's DMA controller
|
|
*
|
|
* Copyright 2005 Mentor Graphics Corporation
|
|
* Copyright (C) 2005-2007 by Texas Instruments
|
|
*/
|
|
#include <linux/device.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include "musb_core.h"
|
|
#include "musb_dma.h"
|
|
|
|
#define MUSB_HSDMA_CHANNEL_OFFSET(_bchannel, _offset) \
|
|
(MUSB_HSDMA_BASE + (_bchannel << 4) + _offset)
|
|
|
|
#define musb_read_hsdma_addr(mbase, bchannel) \
|
|
musb_readl(mbase, \
|
|
MUSB_HSDMA_CHANNEL_OFFSET(bchannel, MUSB_HSDMA_ADDRESS))
|
|
|
|
#define musb_write_hsdma_addr(mbase, bchannel, addr) \
|
|
musb_writel(mbase, \
|
|
MUSB_HSDMA_CHANNEL_OFFSET(bchannel, MUSB_HSDMA_ADDRESS), \
|
|
addr)
|
|
|
|
#define musb_read_hsdma_count(mbase, bchannel) \
|
|
musb_readl(mbase, \
|
|
MUSB_HSDMA_CHANNEL_OFFSET(bchannel, MUSB_HSDMA_COUNT))
|
|
|
|
#define musb_write_hsdma_count(mbase, bchannel, len) \
|
|
musb_writel(mbase, \
|
|
MUSB_HSDMA_CHANNEL_OFFSET(bchannel, MUSB_HSDMA_COUNT), \
|
|
len)
|
|
/* control register (16-bit): */
|
|
#define MUSB_HSDMA_ENABLE_SHIFT 0
|
|
#define MUSB_HSDMA_TRANSMIT_SHIFT 1
|
|
#define MUSB_HSDMA_MODE1_SHIFT 2
|
|
#define MUSB_HSDMA_IRQENABLE_SHIFT 3
|
|
#define MUSB_HSDMA_ENDPOINT_SHIFT 4
|
|
#define MUSB_HSDMA_BUSERROR_SHIFT 8
|
|
#define MUSB_HSDMA_BURSTMODE_SHIFT 9
|
|
#define MUSB_HSDMA_BURSTMODE (3 << MUSB_HSDMA_BURSTMODE_SHIFT)
|
|
#define MUSB_HSDMA_BURSTMODE_UNSPEC 0
|
|
#define MUSB_HSDMA_BURSTMODE_INCR4 1
|
|
#define MUSB_HSDMA_BURSTMODE_INCR8 2
|
|
#define MUSB_HSDMA_BURSTMODE_INCR16 3
|
|
|
|
#define MUSB_HSDMA_CHANNELS 8
|
|
|
|
struct musb_dma_controller;
|
|
|
|
struct musb_dma_channel {
|
|
struct dma_channel channel;
|
|
struct musb_dma_controller *controller;
|
|
u32 start_addr;
|
|
u32 len;
|
|
u16 max_packet_sz;
|
|
u8 idx;
|
|
u8 epnum;
|
|
u8 transmit;
|
|
};
|
|
|
|
struct musb_dma_controller {
|
|
struct dma_controller controller;
|
|
struct musb_dma_channel channel[MUSB_HSDMA_CHANNELS];
|
|
void *private_data;
|
|
void __iomem *base;
|
|
u8 channel_count;
|
|
u8 used_channels;
|
|
int irq;
|
|
};
|
|
|
|
static void dma_channel_release(struct dma_channel *channel);
|
|
|
|
static void dma_controller_stop(struct musb_dma_controller *controller)
|
|
{
|
|
struct musb *musb = controller->private_data;
|
|
struct dma_channel *channel;
|
|
u8 bit;
|
|
|
|
if (controller->used_channels != 0) {
|
|
dev_err(musb->controller,
|
|
"Stopping DMA controller while channel active\n");
|
|
|
|
for (bit = 0; bit < MUSB_HSDMA_CHANNELS; bit++) {
|
|
if (controller->used_channels & (1 << bit)) {
|
|
channel = &controller->channel[bit].channel;
|
|
dma_channel_release(channel);
|
|
|
|
if (!controller->used_channels)
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static struct dma_channel *dma_channel_allocate(struct dma_controller *c,
|
|
struct musb_hw_ep *hw_ep, u8 transmit)
|
|
{
|
|
struct musb_dma_controller *controller = container_of(c,
|
|
struct musb_dma_controller, controller);
|
|
struct musb_dma_channel *musb_channel = NULL;
|
|
struct dma_channel *channel = NULL;
|
|
u8 bit;
|
|
|
|
for (bit = 0; bit < MUSB_HSDMA_CHANNELS; bit++) {
|
|
if (!(controller->used_channels & (1 << bit))) {
|
|
controller->used_channels |= (1 << bit);
|
|
musb_channel = &(controller->channel[bit]);
|
|
musb_channel->controller = controller;
|
|
musb_channel->idx = bit;
|
|
musb_channel->epnum = hw_ep->epnum;
|
|
musb_channel->transmit = transmit;
|
|
channel = &(musb_channel->channel);
|
|
channel->private_data = musb_channel;
|
|
channel->status = MUSB_DMA_STATUS_FREE;
|
|
channel->max_len = 0x100000;
|
|
/* Tx => mode 1; Rx => mode 0 */
|
|
channel->desired_mode = transmit;
|
|
channel->actual_len = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return channel;
|
|
}
|
|
|
|
static void dma_channel_release(struct dma_channel *channel)
|
|
{
|
|
struct musb_dma_channel *musb_channel = channel->private_data;
|
|
|
|
channel->actual_len = 0;
|
|
musb_channel->start_addr = 0;
|
|
musb_channel->len = 0;
|
|
|
|
musb_channel->controller->used_channels &=
|
|
~(1 << musb_channel->idx);
|
|
|
|
channel->status = MUSB_DMA_STATUS_UNKNOWN;
|
|
}
|
|
|
|
static void configure_channel(struct dma_channel *channel,
|
|
u16 packet_sz, u8 mode,
|
|
dma_addr_t dma_addr, u32 len)
|
|
{
|
|
struct musb_dma_channel *musb_channel = channel->private_data;
|
|
struct musb_dma_controller *controller = musb_channel->controller;
|
|
struct musb *musb = controller->private_data;
|
|
void __iomem *mbase = controller->base;
|
|
u8 bchannel = musb_channel->idx;
|
|
u16 csr = 0;
|
|
|
|
musb_dbg(musb, "%p, pkt_sz %d, addr %pad, len %d, mode %d",
|
|
channel, packet_sz, &dma_addr, len, mode);
|
|
|
|
if (mode) {
|
|
csr |= 1 << MUSB_HSDMA_MODE1_SHIFT;
|
|
BUG_ON(len < packet_sz);
|
|
}
|
|
csr |= MUSB_HSDMA_BURSTMODE_INCR16
|
|
<< MUSB_HSDMA_BURSTMODE_SHIFT;
|
|
|
|
csr |= (musb_channel->epnum << MUSB_HSDMA_ENDPOINT_SHIFT)
|
|
| (1 << MUSB_HSDMA_ENABLE_SHIFT)
|
|
| (1 << MUSB_HSDMA_IRQENABLE_SHIFT)
|
|
| (musb_channel->transmit
|
|
? (1 << MUSB_HSDMA_TRANSMIT_SHIFT)
|
|
: 0);
|
|
|
|
/* address/count */
|
|
musb_write_hsdma_addr(mbase, bchannel, dma_addr);
|
|
musb_write_hsdma_count(mbase, bchannel, len);
|
|
|
|
/* control (this should start things) */
|
|
musb_writew(mbase,
|
|
MUSB_HSDMA_CHANNEL_OFFSET(bchannel, MUSB_HSDMA_CONTROL),
|
|
csr);
|
|
}
|
|
|
|
static int dma_channel_program(struct dma_channel *channel,
|
|
u16 packet_sz, u8 mode,
|
|
dma_addr_t dma_addr, u32 len)
|
|
{
|
|
struct musb_dma_channel *musb_channel = channel->private_data;
|
|
struct musb_dma_controller *controller = musb_channel->controller;
|
|
struct musb *musb = controller->private_data;
|
|
|
|
musb_dbg(musb, "ep%d-%s pkt_sz %d, dma_addr %pad length %d, mode %d",
|
|
musb_channel->epnum,
|
|
musb_channel->transmit ? "Tx" : "Rx",
|
|
packet_sz, &dma_addr, len, mode);
|
|
|
|
BUG_ON(channel->status == MUSB_DMA_STATUS_UNKNOWN ||
|
|
channel->status == MUSB_DMA_STATUS_BUSY);
|
|
|
|
/*
|
|
* The DMA engine in RTL1.8 and above cannot handle
|
|
* DMA addresses that are not aligned to a 4 byte boundary.
|
|
* It ends up masking the last two bits of the address
|
|
* programmed in DMA_ADDR.
|
|
*
|
|
* Fail such DMA transfers, so that the backup PIO mode
|
|
* can carry out the transfer
|
|
*/
|
|
if ((musb->hwvers >= MUSB_HWVERS_1800) && (dma_addr % 4))
|
|
return false;
|
|
|
|
channel->actual_len = 0;
|
|
musb_channel->start_addr = dma_addr;
|
|
musb_channel->len = len;
|
|
musb_channel->max_packet_sz = packet_sz;
|
|
channel->status = MUSB_DMA_STATUS_BUSY;
|
|
|
|
configure_channel(channel, packet_sz, mode, dma_addr, len);
|
|
|
|
return true;
|
|
}
|
|
|
|
static int dma_channel_abort(struct dma_channel *channel)
|
|
{
|
|
struct musb_dma_channel *musb_channel = channel->private_data;
|
|
void __iomem *mbase = musb_channel->controller->base;
|
|
struct musb *musb = musb_channel->controller->private_data;
|
|
|
|
u8 bchannel = musb_channel->idx;
|
|
int offset;
|
|
u16 csr;
|
|
|
|
if (channel->status == MUSB_DMA_STATUS_BUSY) {
|
|
if (musb_channel->transmit) {
|
|
offset = musb->io.ep_offset(musb_channel->epnum,
|
|
MUSB_TXCSR);
|
|
|
|
/*
|
|
* The programming guide says that we must clear
|
|
* the DMAENAB bit before the DMAMODE bit...
|
|
*/
|
|
csr = musb_readw(mbase, offset);
|
|
csr &= ~(MUSB_TXCSR_AUTOSET | MUSB_TXCSR_DMAENAB);
|
|
musb_writew(mbase, offset, csr);
|
|
csr &= ~MUSB_TXCSR_DMAMODE;
|
|
musb_writew(mbase, offset, csr);
|
|
} else {
|
|
offset = musb->io.ep_offset(musb_channel->epnum,
|
|
MUSB_RXCSR);
|
|
|
|
csr = musb_readw(mbase, offset);
|
|
csr &= ~(MUSB_RXCSR_AUTOCLEAR |
|
|
MUSB_RXCSR_DMAENAB |
|
|
MUSB_RXCSR_DMAMODE);
|
|
musb_writew(mbase, offset, csr);
|
|
}
|
|
|
|
musb_writew(mbase,
|
|
MUSB_HSDMA_CHANNEL_OFFSET(bchannel, MUSB_HSDMA_CONTROL),
|
|
0);
|
|
musb_write_hsdma_addr(mbase, bchannel, 0);
|
|
musb_write_hsdma_count(mbase, bchannel, 0);
|
|
channel->status = MUSB_DMA_STATUS_FREE;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
irqreturn_t dma_controller_irq(int irq, void *private_data)
|
|
{
|
|
struct musb_dma_controller *controller = private_data;
|
|
struct musb *musb = controller->private_data;
|
|
struct musb_dma_channel *musb_channel;
|
|
struct dma_channel *channel;
|
|
|
|
void __iomem *mbase = controller->base;
|
|
|
|
irqreturn_t retval = IRQ_NONE;
|
|
|
|
unsigned long flags;
|
|
|
|
u8 bchannel;
|
|
u8 int_hsdma;
|
|
|
|
u32 addr, count;
|
|
u16 csr;
|
|
|
|
spin_lock_irqsave(&musb->lock, flags);
|
|
|
|
int_hsdma = musb_clearb(mbase, MUSB_HSDMA_INTR);
|
|
|
|
if (!int_hsdma) {
|
|
musb_dbg(musb, "spurious DMA irq");
|
|
|
|
for (bchannel = 0; bchannel < MUSB_HSDMA_CHANNELS; bchannel++) {
|
|
musb_channel = (struct musb_dma_channel *)
|
|
&(controller->channel[bchannel]);
|
|
channel = &musb_channel->channel;
|
|
if (channel->status == MUSB_DMA_STATUS_BUSY) {
|
|
count = musb_read_hsdma_count(mbase, bchannel);
|
|
|
|
if (count == 0)
|
|
int_hsdma |= (1 << bchannel);
|
|
}
|
|
}
|
|
|
|
musb_dbg(musb, "int_hsdma = 0x%x", int_hsdma);
|
|
|
|
if (!int_hsdma)
|
|
goto done;
|
|
}
|
|
|
|
for (bchannel = 0; bchannel < MUSB_HSDMA_CHANNELS; bchannel++) {
|
|
if (int_hsdma & (1 << bchannel)) {
|
|
musb_channel = (struct musb_dma_channel *)
|
|
&(controller->channel[bchannel]);
|
|
channel = &musb_channel->channel;
|
|
|
|
csr = musb_readw(mbase,
|
|
MUSB_HSDMA_CHANNEL_OFFSET(bchannel,
|
|
MUSB_HSDMA_CONTROL));
|
|
|
|
if (csr & (1 << MUSB_HSDMA_BUSERROR_SHIFT)) {
|
|
musb_channel->channel.status =
|
|
MUSB_DMA_STATUS_BUS_ABORT;
|
|
} else {
|
|
addr = musb_read_hsdma_addr(mbase,
|
|
bchannel);
|
|
channel->actual_len = addr
|
|
- musb_channel->start_addr;
|
|
|
|
musb_dbg(musb, "ch %p, 0x%x -> 0x%x (%zu / %d) %s",
|
|
channel, musb_channel->start_addr,
|
|
addr, channel->actual_len,
|
|
musb_channel->len,
|
|
(channel->actual_len
|
|
< musb_channel->len) ?
|
|
"=> reconfig 0" : "=> complete");
|
|
|
|
channel->status = MUSB_DMA_STATUS_FREE;
|
|
|
|
/* completed */
|
|
if (musb_channel->transmit &&
|
|
(!channel->desired_mode ||
|
|
(channel->actual_len %
|
|
musb_channel->max_packet_sz))) {
|
|
u8 epnum = musb_channel->epnum;
|
|
int offset = musb->io.ep_offset(epnum,
|
|
MUSB_TXCSR);
|
|
u16 txcsr;
|
|
|
|
/*
|
|
* The programming guide says that we
|
|
* must clear DMAENAB before DMAMODE.
|
|
*/
|
|
musb_ep_select(mbase, epnum);
|
|
txcsr = musb_readw(mbase, offset);
|
|
if (channel->desired_mode == 1) {
|
|
txcsr &= ~(MUSB_TXCSR_DMAENAB
|
|
| MUSB_TXCSR_AUTOSET);
|
|
musb_writew(mbase, offset, txcsr);
|
|
/* Send out the packet */
|
|
txcsr &= ~MUSB_TXCSR_DMAMODE;
|
|
txcsr |= MUSB_TXCSR_DMAENAB;
|
|
}
|
|
txcsr |= MUSB_TXCSR_TXPKTRDY;
|
|
musb_writew(mbase, offset, txcsr);
|
|
}
|
|
musb_dma_completion(musb, musb_channel->epnum,
|
|
musb_channel->transmit);
|
|
}
|
|
}
|
|
}
|
|
|
|
retval = IRQ_HANDLED;
|
|
done:
|
|
spin_unlock_irqrestore(&musb->lock, flags);
|
|
return retval;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dma_controller_irq);
|
|
|
|
void musbhs_dma_controller_destroy(struct dma_controller *c)
|
|
{
|
|
struct musb_dma_controller *controller = container_of(c,
|
|
struct musb_dma_controller, controller);
|
|
|
|
dma_controller_stop(controller);
|
|
|
|
if (controller->irq)
|
|
free_irq(controller->irq, c);
|
|
|
|
kfree(controller);
|
|
}
|
|
EXPORT_SYMBOL_GPL(musbhs_dma_controller_destroy);
|
|
|
|
static struct musb_dma_controller *
|
|
dma_controller_alloc(struct musb *musb, void __iomem *base)
|
|
{
|
|
struct musb_dma_controller *controller;
|
|
|
|
controller = kzalloc(sizeof(*controller), GFP_KERNEL);
|
|
if (!controller)
|
|
return NULL;
|
|
|
|
controller->channel_count = MUSB_HSDMA_CHANNELS;
|
|
controller->private_data = musb;
|
|
controller->base = base;
|
|
|
|
controller->controller.channel_alloc = dma_channel_allocate;
|
|
controller->controller.channel_release = dma_channel_release;
|
|
controller->controller.channel_program = dma_channel_program;
|
|
controller->controller.channel_abort = dma_channel_abort;
|
|
return controller;
|
|
}
|
|
|
|
struct dma_controller *
|
|
musbhs_dma_controller_create(struct musb *musb, void __iomem *base)
|
|
{
|
|
struct musb_dma_controller *controller;
|
|
struct device *dev = musb->controller;
|
|
struct platform_device *pdev = to_platform_device(dev);
|
|
int irq = platform_get_irq_byname(pdev, "dma");
|
|
|
|
if (irq <= 0) {
|
|
dev_err(dev, "No DMA interrupt line!\n");
|
|
return NULL;
|
|
}
|
|
|
|
controller = dma_controller_alloc(musb, base);
|
|
if (!controller)
|
|
return NULL;
|
|
|
|
if (request_irq(irq, dma_controller_irq, 0,
|
|
dev_name(musb->controller), controller)) {
|
|
dev_err(dev, "request_irq %d failed!\n", irq);
|
|
musb_dma_controller_destroy(&controller->controller);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
controller->irq = irq;
|
|
|
|
return &controller->controller;
|
|
}
|
|
EXPORT_SYMBOL_GPL(musbhs_dma_controller_create);
|
|
|
|
struct dma_controller *
|
|
musbhs_dma_controller_create_noirq(struct musb *musb, void __iomem *base)
|
|
{
|
|
struct musb_dma_controller *controller;
|
|
|
|
controller = dma_controller_alloc(musb, base);
|
|
if (!controller)
|
|
return NULL;
|
|
|
|
return &controller->controller;
|
|
}
|
|
EXPORT_SYMBOL_GPL(musbhs_dma_controller_create_noirq);
|