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u-boot/drivers/dma/ti-edma3.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

580 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* Enhanced Direct Memory Access (EDMA3) Controller
*
* (C) Copyright 2014
* Texas Instruments Incorporated, <www.ti.com>
*
* Author: Ivan Khoronzhuk <ivan.khoronzhuk@ti.com>
*/
#include <asm/io.h>
#include <common.h>
#include <dm.h>
#include <dma.h>
#include <asm/omap_common.h>
#include <asm/ti-common/ti-edma3.h>
#define EDMA3_SL_BASE(slot) (0x4000 + ((slot) << 5))
#define EDMA3_SL_MAX_NUM 512
#define EDMA3_SLOPT_FIFO_WIDTH_MASK (0x7 << 8)
#define EDMA3_QCHMAP(ch) 0x0200 + ((ch) << 2)
#define EDMA3_CHMAP_PARSET_MASK 0x1ff
#define EDMA3_CHMAP_PARSET_SHIFT 0x5
#define EDMA3_CHMAP_TRIGWORD_SHIFT 0x2
#define EDMA3_QEMCR 0x314
#define EDMA3_IPR 0x1068
#define EDMA3_IPRH 0x106c
#define EDMA3_ICR 0x1070
#define EDMA3_ICRH 0x1074
#define EDMA3_QEECR 0x1088
#define EDMA3_QEESR 0x108c
#define EDMA3_QSECR 0x1094
#define EDMA_FILL_BUFFER_SIZE 512
struct ti_edma3_priv {
u32 base;
};
static u8 edma_fill_buffer[EDMA_FILL_BUFFER_SIZE] __aligned(ARCH_DMA_MINALIGN);
/**
* qedma3_start - start qdma on a channel
* @base: base address of edma
* @cfg: pinter to struct edma3_channel_config where you can set
* the slot number to associate with, the chnum, which corresponds
* your quick channel number 0-7, complete code - transfer complete code
* and trigger slot word - which has to correspond to the word number in
* edma3_slot_layout struct for generating event.
*
*/
void qedma3_start(u32 base, struct edma3_channel_config *cfg)
{
u32 qchmap;
/* Clear the pending int bit */
if (cfg->complete_code < 32)
__raw_writel(1 << cfg->complete_code, base + EDMA3_ICR);
else
__raw_writel(1 << cfg->complete_code, base + EDMA3_ICRH);
/* Map parameter set and trigger word 7 to quick channel */
qchmap = ((EDMA3_CHMAP_PARSET_MASK & cfg->slot)
<< EDMA3_CHMAP_PARSET_SHIFT) |
(cfg->trigger_slot_word << EDMA3_CHMAP_TRIGWORD_SHIFT);
__raw_writel(qchmap, base + EDMA3_QCHMAP(cfg->chnum));
/* Clear missed event if set*/
__raw_writel(1 << cfg->chnum, base + EDMA3_QSECR);
__raw_writel(1 << cfg->chnum, base + EDMA3_QEMCR);
/* Enable qdma channel event */
__raw_writel(1 << cfg->chnum, base + EDMA3_QEESR);
}
/**
* edma3_set_dest - set initial DMA destination address in parameter RAM slot
* @base: base address of edma
* @slot: parameter RAM slot being configured
* @dst: physical address of destination (memory, controller FIFO, etc)
* @addressMode: INCR, except in very rare cases
* @width: ignored unless @addressMode is FIFO, else specifies the
* width to use when addressing the fifo (e.g. W8BIT, W32BIT)
*
* Note that the destination address is modified during the DMA transfer
* according to edma3_set_dest_index().
*/
void edma3_set_dest(u32 base, int slot, u32 dst, enum edma3_address_mode mode,
enum edma3_fifo_width width)
{
u32 opt;
struct edma3_slot_layout *rg;
rg = (struct edma3_slot_layout *)(base + EDMA3_SL_BASE(slot));
opt = __raw_readl(&rg->opt);
if (mode == FIFO)
opt = (opt & EDMA3_SLOPT_FIFO_WIDTH_MASK) |
(EDMA3_SLOPT_DST_ADDR_CONST_MODE |
EDMA3_SLOPT_FIFO_WIDTH_SET(width));
else
opt &= ~EDMA3_SLOPT_DST_ADDR_CONST_MODE;
__raw_writel(opt, &rg->opt);
__raw_writel(dst, &rg->dst);
}
/**
* edma3_set_dest_index - configure DMA destination address indexing
* @base: base address of edma
* @slot: parameter RAM slot being configured
* @bidx: byte offset between destination arrays in a frame
* @cidx: byte offset between destination frames in a block
*
* Offsets are specified to support either contiguous or discontiguous
* memory transfers, or repeated access to a hardware register, as needed.
* When accessing hardware registers, both offsets are normally zero.
*/
void edma3_set_dest_index(u32 base, unsigned slot, int bidx, int cidx)
{
u32 src_dst_bidx;
u32 src_dst_cidx;
struct edma3_slot_layout *rg;
rg = (struct edma3_slot_layout *)(base + EDMA3_SL_BASE(slot));
src_dst_bidx = __raw_readl(&rg->src_dst_bidx);
src_dst_cidx = __raw_readl(&rg->src_dst_cidx);
__raw_writel((src_dst_bidx & 0x0000ffff) | (bidx << 16),
&rg->src_dst_bidx);
__raw_writel((src_dst_cidx & 0x0000ffff) | (cidx << 16),
&rg->src_dst_cidx);
}
/**
* edma3_set_dest_addr - set destination address for slot only
*/
void edma3_set_dest_addr(u32 base, int slot, u32 dst)
{
struct edma3_slot_layout *rg;
rg = (struct edma3_slot_layout *)(base + EDMA3_SL_BASE(slot));
__raw_writel(dst, &rg->dst);
}
/**
* edma3_set_src - set initial DMA source address in parameter RAM slot
* @base: base address of edma
* @slot: parameter RAM slot being configured
* @src_port: physical address of source (memory, controller FIFO, etc)
* @mode: INCR, except in very rare cases
* @width: ignored unless @addressMode is FIFO, else specifies the
* width to use when addressing the fifo (e.g. W8BIT, W32BIT)
*
* Note that the source address is modified during the DMA transfer
* according to edma3_set_src_index().
*/
void edma3_set_src(u32 base, int slot, u32 src, enum edma3_address_mode mode,
enum edma3_fifo_width width)
{
u32 opt;
struct edma3_slot_layout *rg;
rg = (struct edma3_slot_layout *)(base + EDMA3_SL_BASE(slot));
opt = __raw_readl(&rg->opt);
if (mode == FIFO)
opt = (opt & EDMA3_SLOPT_FIFO_WIDTH_MASK) |
(EDMA3_SLOPT_DST_ADDR_CONST_MODE |
EDMA3_SLOPT_FIFO_WIDTH_SET(width));
else
opt &= ~EDMA3_SLOPT_DST_ADDR_CONST_MODE;
__raw_writel(opt, &rg->opt);
__raw_writel(src, &rg->src);
}
/**
* edma3_set_src_index - configure DMA source address indexing
* @base: base address of edma
* @slot: parameter RAM slot being configured
* @bidx: byte offset between source arrays in a frame
* @cidx: byte offset between source frames in a block
*
* Offsets are specified to support either contiguous or discontiguous
* memory transfers, or repeated access to a hardware register, as needed.
* When accessing hardware registers, both offsets are normally zero.
*/
void edma3_set_src_index(u32 base, unsigned slot, int bidx, int cidx)
{
u32 src_dst_bidx;
u32 src_dst_cidx;
struct edma3_slot_layout *rg;
rg = (struct edma3_slot_layout *)(base + EDMA3_SL_BASE(slot));
src_dst_bidx = __raw_readl(&rg->src_dst_bidx);
src_dst_cidx = __raw_readl(&rg->src_dst_cidx);
__raw_writel((src_dst_bidx & 0xffff0000) | bidx,
&rg->src_dst_bidx);
__raw_writel((src_dst_cidx & 0xffff0000) | cidx,
&rg->src_dst_cidx);
}
/**
* edma3_set_src_addr - set source address for slot only
*/
void edma3_set_src_addr(u32 base, int slot, u32 src)
{
struct edma3_slot_layout *rg;
rg = (struct edma3_slot_layout *)(base + EDMA3_SL_BASE(slot));
__raw_writel(src, &rg->src);
}
/**
* edma3_set_transfer_params - configure DMA transfer parameters
* @base: base address of edma
* @slot: parameter RAM slot being configured
* @acnt: how many bytes per array (at least one)
* @bcnt: how many arrays per frame (at least one)
* @ccnt: how many frames per block (at least one)
* @bcnt_rld: used only for A-Synchronized transfers; this specifies
* the value to reload into bcnt when it decrements to zero
* @sync_mode: ASYNC or ABSYNC
*
* See the EDMA3 documentation to understand how to configure and link
* transfers using the fields in PaRAM slots. If you are not doing it
* all at once with edma3_write_slot(), you will use this routine
* plus two calls each for source and destination, setting the initial
* address and saying how to index that address.
*
* An example of an A-Synchronized transfer is a serial link using a
* single word shift register. In that case, @acnt would be equal to
* that word size; the serial controller issues a DMA synchronization
* event to transfer each word, and memory access by the DMA transfer
* controller will be word-at-a-time.
*
* An example of an AB-Synchronized transfer is a device using a FIFO.
* In that case, @acnt equals the FIFO width and @bcnt equals its depth.
* The controller with the FIFO issues DMA synchronization events when
* the FIFO threshold is reached, and the DMA transfer controller will
* transfer one frame to (or from) the FIFO. It will probably use
* efficient burst modes to access memory.
*/
void edma3_set_transfer_params(u32 base, int slot, int acnt,
int bcnt, int ccnt, u16 bcnt_rld,
enum edma3_sync_dimension sync_mode)
{
u32 opt;
u32 link_bcntrld;
struct edma3_slot_layout *rg;
rg = (struct edma3_slot_layout *)(base + EDMA3_SL_BASE(slot));
link_bcntrld = __raw_readl(&rg->link_bcntrld);
__raw_writel((bcnt_rld << 16) | (0x0000ffff & link_bcntrld),
&rg->link_bcntrld);
opt = __raw_readl(&rg->opt);
if (sync_mode == ASYNC)
__raw_writel(opt & ~EDMA3_SLOPT_AB_SYNC, &rg->opt);
else
__raw_writel(opt | EDMA3_SLOPT_AB_SYNC, &rg->opt);
/* Set the acount, bcount, ccount registers */
__raw_writel((bcnt << 16) | (acnt & 0xffff), &rg->a_b_cnt);
__raw_writel(0xffff & ccnt, &rg->ccnt);
}
/**
* edma3_write_slot - write parameter RAM data for slot
* @base: base address of edma
* @slot: number of parameter RAM slot being modified
* @param: data to be written into parameter RAM slot
*
* Use this to assign all parameters of a transfer at once. This
* allows more efficient setup of transfers than issuing multiple
* calls to set up those parameters in small pieces, and provides
* complete control over all transfer options.
*/
void edma3_write_slot(u32 base, int slot, struct edma3_slot_layout *param)
{
int i;
u32 *p = (u32 *)param;
u32 *addr = (u32 *)(base + EDMA3_SL_BASE(slot));
for (i = 0; i < sizeof(struct edma3_slot_layout)/4; i += 4)
__raw_writel(*p++, addr++);
}
/**
* edma3_read_slot - read parameter RAM data from slot
* @base: base address of edma
* @slot: number of parameter RAM slot being copied
* @param: where to store copy of parameter RAM data
*
* Use this to read data from a parameter RAM slot, perhaps to
* save them as a template for later reuse.
*/
void edma3_read_slot(u32 base, int slot, struct edma3_slot_layout *param)
{
int i;
u32 *p = (u32 *)param;
u32 *addr = (u32 *)(base + EDMA3_SL_BASE(slot));
for (i = 0; i < sizeof(struct edma3_slot_layout)/4; i += 4)
*p++ = __raw_readl(addr++);
}
void edma3_slot_configure(u32 base, int slot, struct edma3_slot_config *cfg)
{
struct edma3_slot_layout *rg;
rg = (struct edma3_slot_layout *)(base + EDMA3_SL_BASE(slot));
__raw_writel(cfg->opt, &rg->opt);
__raw_writel(cfg->src, &rg->src);
__raw_writel((cfg->bcnt << 16) | (cfg->acnt & 0xffff), &rg->a_b_cnt);
__raw_writel(cfg->dst, &rg->dst);
__raw_writel((cfg->dst_bidx << 16) |
(cfg->src_bidx & 0xffff), &rg->src_dst_bidx);
__raw_writel((cfg->bcntrld << 16) |
(cfg->link & 0xffff), &rg->link_bcntrld);
__raw_writel((cfg->dst_cidx << 16) |
(cfg->src_cidx & 0xffff), &rg->src_dst_cidx);
__raw_writel(0xffff & cfg->ccnt, &rg->ccnt);
}
/**
* edma3_check_for_transfer - check if transfer coplete by checking
* interrupt pending bit. Clear interrupt pending bit if complete.
* @base: base address of edma
* @cfg: pinter to struct edma3_channel_config which was passed
* to qedma3_start when you started qdma channel
*
* Return 0 if complete, 1 if not.
*/
int edma3_check_for_transfer(u32 base, struct edma3_channel_config *cfg)
{
u32 inum;
u32 ipr_base;
u32 icr_base;
if (cfg->complete_code < 32) {
ipr_base = base + EDMA3_IPR;
icr_base = base + EDMA3_ICR;
inum = 1 << cfg->complete_code;
} else {
ipr_base = base + EDMA3_IPRH;
icr_base = base + EDMA3_ICRH;
inum = 1 << (cfg->complete_code - 32);
}
/* check complete interrupt */
if (!(__raw_readl(ipr_base) & inum))
return 1;
/* clean up the pending int bit */
__raw_writel(inum, icr_base);
return 0;
}
/**
* qedma3_stop - stops dma on the channel passed
* @base: base address of edma
* @cfg: pinter to struct edma3_channel_config which was passed
* to qedma3_start when you started qdma channel
*/
void qedma3_stop(u32 base, struct edma3_channel_config *cfg)
{
/* Disable qdma channel event */
__raw_writel(1 << cfg->chnum, base + EDMA3_QEECR);
/* clean up the interrupt indication */
if (cfg->complete_code < 32)
__raw_writel(1 << cfg->complete_code, base + EDMA3_ICR);
else
__raw_writel(1 << cfg->complete_code, base + EDMA3_ICRH);
/* Clear missed event if set*/
__raw_writel(1 << cfg->chnum, base + EDMA3_QSECR);
__raw_writel(1 << cfg->chnum, base + EDMA3_QEMCR);
/* Clear the channel map */
__raw_writel(0, base + EDMA3_QCHMAP(cfg->chnum));
}
void __edma3_transfer(unsigned long edma3_base_addr, unsigned int edma_slot_num,
void *dst, void *src, size_t len, size_t s_len)
{
struct edma3_slot_config slot;
struct edma3_channel_config edma_channel;
int b_cnt_value = 1;
int rem_bytes = 0;
int a_cnt_value = len;
unsigned int addr = (unsigned int) (dst);
unsigned int max_acnt = 0x7FFFU;
if (len > s_len) {
b_cnt_value = (len / s_len);
rem_bytes = (len % s_len);
a_cnt_value = s_len;
} else if (len > max_acnt) {
b_cnt_value = (len / max_acnt);
rem_bytes = (len % max_acnt);
a_cnt_value = max_acnt;
}
slot.opt = 0;
slot.src = ((unsigned int) src);
slot.acnt = a_cnt_value;
slot.bcnt = b_cnt_value;
slot.ccnt = 1;
if (len == s_len)
slot.src_bidx = a_cnt_value;
else
slot.src_bidx = 0;
slot.dst_bidx = a_cnt_value;
slot.src_cidx = 0;
slot.dst_cidx = 0;
slot.link = EDMA3_PARSET_NULL_LINK;
slot.bcntrld = 0;
slot.opt = EDMA3_SLOPT_TRANS_COMP_INT_ENB |
EDMA3_SLOPT_COMP_CODE(0) |
EDMA3_SLOPT_STATIC | EDMA3_SLOPT_AB_SYNC;
edma3_slot_configure(edma3_base_addr, edma_slot_num, &slot);
edma_channel.slot = edma_slot_num;
edma_channel.chnum = 0;
edma_channel.complete_code = 0;
/* set event trigger to dst update */
edma_channel.trigger_slot_word = EDMA3_TWORD(dst);
qedma3_start(edma3_base_addr, &edma_channel);
edma3_set_dest_addr(edma3_base_addr, edma_channel.slot, addr);
while (edma3_check_for_transfer(edma3_base_addr, &edma_channel))
;
qedma3_stop(edma3_base_addr, &edma_channel);
if (rem_bytes != 0) {
slot.opt = 0;
if (len == s_len)
slot.src =
(b_cnt_value * max_acnt) + ((unsigned int) src);
else
slot.src = (unsigned int) src;
slot.acnt = rem_bytes;
slot.bcnt = 1;
slot.ccnt = 1;
slot.src_bidx = rem_bytes;
slot.dst_bidx = rem_bytes;
slot.src_cidx = 0;
slot.dst_cidx = 0;
slot.link = EDMA3_PARSET_NULL_LINK;
slot.bcntrld = 0;
slot.opt = EDMA3_SLOPT_TRANS_COMP_INT_ENB |
EDMA3_SLOPT_COMP_CODE(0) |
EDMA3_SLOPT_STATIC | EDMA3_SLOPT_AB_SYNC;
edma3_slot_configure(edma3_base_addr, edma_slot_num, &slot);
edma_channel.slot = edma_slot_num;
edma_channel.chnum = 0;
edma_channel.complete_code = 0;
/* set event trigger to dst update */
edma_channel.trigger_slot_word = EDMA3_TWORD(dst);
qedma3_start(edma3_base_addr, &edma_channel);
edma3_set_dest_addr(edma3_base_addr, edma_channel.slot, addr +
(max_acnt * b_cnt_value));
while (edma3_check_for_transfer(edma3_base_addr, &edma_channel))
;
qedma3_stop(edma3_base_addr, &edma_channel);
}
}
void __edma3_fill(unsigned long edma3_base_addr, unsigned int edma_slot_num,
void *dst, u8 val, size_t len)
{
int xfer_len;
int max_xfer = EDMA_FILL_BUFFER_SIZE * 65535;
memset((void *)edma_fill_buffer, val, sizeof(edma_fill_buffer));
while (len) {
xfer_len = len;
if (xfer_len > max_xfer)
xfer_len = max_xfer;
__edma3_transfer(edma3_base_addr, edma_slot_num, dst,
edma_fill_buffer, xfer_len,
EDMA_FILL_BUFFER_SIZE);
len -= xfer_len;
dst += xfer_len;
}
}
#ifndef CONFIG_DMA
void edma3_transfer(unsigned long edma3_base_addr, unsigned int edma_slot_num,
void *dst, void *src, size_t len)
{
__edma3_transfer(edma3_base_addr, edma_slot_num, dst, src, len, len);
}
void edma3_fill(unsigned long edma3_base_addr, unsigned int edma_slot_num,
void *dst, u8 val, size_t len)
{
__edma3_fill(edma3_base_addr, edma_slot_num, dst, val, len);
}
#else
static int ti_edma3_transfer(struct udevice *dev, int direction, void *dst,
void *src, size_t len)
{
struct ti_edma3_priv *priv = dev_get_priv(dev);
/* enable edma3 clocks */
enable_edma3_clocks();
switch (direction) {
case DMA_MEM_TO_MEM:
__edma3_transfer(priv->base, 1, dst, src, len, len);
break;
default:
pr_err("Transfer type not implemented in DMA driver\n");
break;
}
/* disable edma3 clocks */
disable_edma3_clocks();
return 0;
}
static int ti_edma3_ofdata_to_platdata(struct udevice *dev)
{
struct ti_edma3_priv *priv = dev_get_priv(dev);
priv->base = devfdt_get_addr(dev);
return 0;
}
static int ti_edma3_probe(struct udevice *dev)
{
struct dma_dev_priv *uc_priv = dev_get_uclass_priv(dev);
uc_priv->supported = DMA_SUPPORTS_MEM_TO_MEM;
return 0;
}
static const struct dma_ops ti_edma3_ops = {
.transfer = ti_edma3_transfer,
};
static const struct udevice_id ti_edma3_ids[] = {
{ .compatible = "ti,edma3" },
{ }
};
U_BOOT_DRIVER(ti_edma3) = {
.name = "ti_edma3",
.id = UCLASS_DMA,
.of_match = ti_edma3_ids,
.ops = &ti_edma3_ops,
.ofdata_to_platdata = ti_edma3_ofdata_to_platdata,
.probe = ti_edma3_probe,
.priv_auto_alloc_size = sizeof(struct ti_edma3_priv),
};
#endif /* CONFIG_DMA */
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