mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 03:10:12 +00:00
![Linus Walleij](/assets/img/avatar_default.png)
Switch to allocating LCLA in memory instead of having a fixed address. Signed-off-by: Jonas Aaberg <jonas.aberg@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
454 lines
12 KiB
C
454 lines
12 KiB
C
/*
|
|
* driver/dma/ste_dma40_ll.c
|
|
*
|
|
* Copyright (C) ST-Ericsson 2007-2010
|
|
* License terms: GNU General Public License (GPL) version 2
|
|
* Author: Per Friden <per.friden@stericsson.com>
|
|
* Author: Jonas Aaberg <jonas.aberg@stericsson.com>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <plat/ste_dma40.h>
|
|
|
|
#include "ste_dma40_ll.h"
|
|
|
|
/* Sets up proper LCSP1 and LCSP3 register for a logical channel */
|
|
void d40_log_cfg(struct stedma40_chan_cfg *cfg,
|
|
u32 *lcsp1, u32 *lcsp3)
|
|
{
|
|
u32 l3 = 0; /* dst */
|
|
u32 l1 = 0; /* src */
|
|
|
|
/* src is mem? -> increase address pos */
|
|
if (cfg->dir == STEDMA40_MEM_TO_PERIPH ||
|
|
cfg->dir == STEDMA40_MEM_TO_MEM)
|
|
l1 |= 1 << D40_MEM_LCSP1_SCFG_INCR_POS;
|
|
|
|
/* dst is mem? -> increase address pos */
|
|
if (cfg->dir == STEDMA40_PERIPH_TO_MEM ||
|
|
cfg->dir == STEDMA40_MEM_TO_MEM)
|
|
l3 |= 1 << D40_MEM_LCSP3_DCFG_INCR_POS;
|
|
|
|
/* src is hw? -> master port 1 */
|
|
if (cfg->dir == STEDMA40_PERIPH_TO_MEM ||
|
|
cfg->dir == STEDMA40_PERIPH_TO_PERIPH)
|
|
l1 |= 1 << D40_MEM_LCSP1_SCFG_MST_POS;
|
|
|
|
/* dst is hw? -> master port 1 */
|
|
if (cfg->dir == STEDMA40_MEM_TO_PERIPH ||
|
|
cfg->dir == STEDMA40_PERIPH_TO_PERIPH)
|
|
l3 |= 1 << D40_MEM_LCSP3_DCFG_MST_POS;
|
|
|
|
l3 |= 1 << D40_MEM_LCSP3_DCFG_TIM_POS;
|
|
l3 |= 1 << D40_MEM_LCSP3_DCFG_EIM_POS;
|
|
l3 |= cfg->dst_info.psize << D40_MEM_LCSP3_DCFG_PSIZE_POS;
|
|
l3 |= cfg->dst_info.data_width << D40_MEM_LCSP3_DCFG_ESIZE_POS;
|
|
l3 |= 1 << D40_MEM_LCSP3_DTCP_POS;
|
|
|
|
l1 |= 1 << D40_MEM_LCSP1_SCFG_EIM_POS;
|
|
l1 |= cfg->src_info.psize << D40_MEM_LCSP1_SCFG_PSIZE_POS;
|
|
l1 |= cfg->src_info.data_width << D40_MEM_LCSP1_SCFG_ESIZE_POS;
|
|
l1 |= 1 << D40_MEM_LCSP1_STCP_POS;
|
|
|
|
*lcsp1 = l1;
|
|
*lcsp3 = l3;
|
|
|
|
}
|
|
|
|
/* Sets up SRC and DST CFG register for both logical and physical channels */
|
|
void d40_phy_cfg(struct stedma40_chan_cfg *cfg,
|
|
u32 *src_cfg, u32 *dst_cfg, bool is_log)
|
|
{
|
|
u32 src = 0;
|
|
u32 dst = 0;
|
|
|
|
if (!is_log) {
|
|
/* Physical channel */
|
|
if ((cfg->dir == STEDMA40_PERIPH_TO_MEM) ||
|
|
(cfg->dir == STEDMA40_PERIPH_TO_PERIPH)) {
|
|
/* Set master port to 1 */
|
|
src |= 1 << D40_SREG_CFG_MST_POS;
|
|
src |= D40_TYPE_TO_EVENT(cfg->src_dev_type);
|
|
|
|
if (cfg->src_info.flow_ctrl == STEDMA40_NO_FLOW_CTRL)
|
|
src |= 1 << D40_SREG_CFG_PHY_TM_POS;
|
|
else
|
|
src |= 3 << D40_SREG_CFG_PHY_TM_POS;
|
|
}
|
|
if ((cfg->dir == STEDMA40_MEM_TO_PERIPH) ||
|
|
(cfg->dir == STEDMA40_PERIPH_TO_PERIPH)) {
|
|
/* Set master port to 1 */
|
|
dst |= 1 << D40_SREG_CFG_MST_POS;
|
|
dst |= D40_TYPE_TO_EVENT(cfg->dst_dev_type);
|
|
|
|
if (cfg->dst_info.flow_ctrl == STEDMA40_NO_FLOW_CTRL)
|
|
dst |= 1 << D40_SREG_CFG_PHY_TM_POS;
|
|
else
|
|
dst |= 3 << D40_SREG_CFG_PHY_TM_POS;
|
|
}
|
|
/* Interrupt on end of transfer for destination */
|
|
dst |= 1 << D40_SREG_CFG_TIM_POS;
|
|
|
|
/* Generate interrupt on error */
|
|
src |= 1 << D40_SREG_CFG_EIM_POS;
|
|
dst |= 1 << D40_SREG_CFG_EIM_POS;
|
|
|
|
/* PSIZE */
|
|
if (cfg->src_info.psize != STEDMA40_PSIZE_PHY_1) {
|
|
src |= 1 << D40_SREG_CFG_PHY_PEN_POS;
|
|
src |= cfg->src_info.psize << D40_SREG_CFG_PSIZE_POS;
|
|
}
|
|
if (cfg->dst_info.psize != STEDMA40_PSIZE_PHY_1) {
|
|
dst |= 1 << D40_SREG_CFG_PHY_PEN_POS;
|
|
dst |= cfg->dst_info.psize << D40_SREG_CFG_PSIZE_POS;
|
|
}
|
|
|
|
/* Element size */
|
|
src |= cfg->src_info.data_width << D40_SREG_CFG_ESIZE_POS;
|
|
dst |= cfg->dst_info.data_width << D40_SREG_CFG_ESIZE_POS;
|
|
|
|
} else {
|
|
/* Logical channel */
|
|
dst |= 1 << D40_SREG_CFG_LOG_GIM_POS;
|
|
src |= 1 << D40_SREG_CFG_LOG_GIM_POS;
|
|
}
|
|
|
|
if (cfg->channel_type & STEDMA40_HIGH_PRIORITY_CHANNEL) {
|
|
src |= 1 << D40_SREG_CFG_PRI_POS;
|
|
dst |= 1 << D40_SREG_CFG_PRI_POS;
|
|
}
|
|
|
|
src |= cfg->src_info.endianess << D40_SREG_CFG_LBE_POS;
|
|
dst |= cfg->dst_info.endianess << D40_SREG_CFG_LBE_POS;
|
|
|
|
*src_cfg = src;
|
|
*dst_cfg = dst;
|
|
}
|
|
|
|
int d40_phy_fill_lli(struct d40_phy_lli *lli,
|
|
dma_addr_t data,
|
|
u32 data_size,
|
|
int psize,
|
|
dma_addr_t next_lli,
|
|
u32 reg_cfg,
|
|
bool term_int,
|
|
u32 data_width,
|
|
bool is_device)
|
|
{
|
|
int num_elems;
|
|
|
|
if (psize == STEDMA40_PSIZE_PHY_1)
|
|
num_elems = 1;
|
|
else
|
|
num_elems = 2 << psize;
|
|
|
|
/*
|
|
* Size is 16bit. data_width is 8, 16, 32 or 64 bit
|
|
* Block large than 64 KiB must be split.
|
|
*/
|
|
if (data_size > (0xffff << data_width))
|
|
return -EINVAL;
|
|
|
|
/* Must be aligned */
|
|
if (!IS_ALIGNED(data, 0x1 << data_width))
|
|
return -EINVAL;
|
|
|
|
/* Transfer size can't be smaller than (num_elms * elem_size) */
|
|
if (data_size < num_elems * (0x1 << data_width))
|
|
return -EINVAL;
|
|
|
|
/* The number of elements. IE now many chunks */
|
|
lli->reg_elt = (data_size >> data_width) << D40_SREG_ELEM_PHY_ECNT_POS;
|
|
|
|
/*
|
|
* Distance to next element sized entry.
|
|
* Usually the size of the element unless you want gaps.
|
|
*/
|
|
if (!is_device)
|
|
lli->reg_elt |= (0x1 << data_width) <<
|
|
D40_SREG_ELEM_PHY_EIDX_POS;
|
|
|
|
/* Where the data is */
|
|
lli->reg_ptr = data;
|
|
lli->reg_cfg = reg_cfg;
|
|
|
|
/* If this scatter list entry is the last one, no next link */
|
|
if (next_lli == 0)
|
|
lli->reg_lnk = 0x1 << D40_SREG_LNK_PHY_TCP_POS;
|
|
else
|
|
lli->reg_lnk = next_lli;
|
|
|
|
/* Set/clear interrupt generation on this link item.*/
|
|
if (term_int)
|
|
lli->reg_cfg |= 0x1 << D40_SREG_CFG_TIM_POS;
|
|
else
|
|
lli->reg_cfg &= ~(0x1 << D40_SREG_CFG_TIM_POS);
|
|
|
|
/* Post link */
|
|
lli->reg_lnk |= 0 << D40_SREG_LNK_PHY_PRE_POS;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int d40_phy_sg_to_lli(struct scatterlist *sg,
|
|
int sg_len,
|
|
dma_addr_t target,
|
|
struct d40_phy_lli *lli,
|
|
dma_addr_t lli_phys,
|
|
u32 reg_cfg,
|
|
u32 data_width,
|
|
int psize,
|
|
bool term_int)
|
|
{
|
|
int total_size = 0;
|
|
int i;
|
|
struct scatterlist *current_sg = sg;
|
|
dma_addr_t next_lli_phys;
|
|
dma_addr_t dst;
|
|
int err = 0;
|
|
|
|
for_each_sg(sg, current_sg, sg_len, i) {
|
|
|
|
total_size += sg_dma_len(current_sg);
|
|
|
|
/* If this scatter list entry is the last one, no next link */
|
|
if (sg_len - 1 == i)
|
|
next_lli_phys = 0;
|
|
else
|
|
next_lli_phys = ALIGN(lli_phys + (i + 1) *
|
|
sizeof(struct d40_phy_lli),
|
|
D40_LLI_ALIGN);
|
|
|
|
if (target)
|
|
dst = target;
|
|
else
|
|
dst = sg_phys(current_sg);
|
|
|
|
err = d40_phy_fill_lli(&lli[i],
|
|
dst,
|
|
sg_dma_len(current_sg),
|
|
psize,
|
|
next_lli_phys,
|
|
reg_cfg,
|
|
!next_lli_phys,
|
|
data_width,
|
|
target == dst);
|
|
if (err)
|
|
goto err;
|
|
}
|
|
|
|
return total_size;
|
|
err:
|
|
return err;
|
|
}
|
|
|
|
|
|
void d40_phy_lli_write(void __iomem *virtbase,
|
|
u32 phy_chan_num,
|
|
struct d40_phy_lli *lli_dst,
|
|
struct d40_phy_lli *lli_src)
|
|
{
|
|
|
|
writel(lli_src->reg_cfg, virtbase + D40_DREG_PCBASE +
|
|
phy_chan_num * D40_DREG_PCDELTA + D40_CHAN_REG_SSCFG);
|
|
writel(lli_src->reg_elt, virtbase + D40_DREG_PCBASE +
|
|
phy_chan_num * D40_DREG_PCDELTA + D40_CHAN_REG_SSELT);
|
|
writel(lli_src->reg_ptr, virtbase + D40_DREG_PCBASE +
|
|
phy_chan_num * D40_DREG_PCDELTA + D40_CHAN_REG_SSPTR);
|
|
writel(lli_src->reg_lnk, virtbase + D40_DREG_PCBASE +
|
|
phy_chan_num * D40_DREG_PCDELTA + D40_CHAN_REG_SSLNK);
|
|
|
|
writel(lli_dst->reg_cfg, virtbase + D40_DREG_PCBASE +
|
|
phy_chan_num * D40_DREG_PCDELTA + D40_CHAN_REG_SDCFG);
|
|
writel(lli_dst->reg_elt, virtbase + D40_DREG_PCBASE +
|
|
phy_chan_num * D40_DREG_PCDELTA + D40_CHAN_REG_SDELT);
|
|
writel(lli_dst->reg_ptr, virtbase + D40_DREG_PCBASE +
|
|
phy_chan_num * D40_DREG_PCDELTA + D40_CHAN_REG_SDPTR);
|
|
writel(lli_dst->reg_lnk, virtbase + D40_DREG_PCBASE +
|
|
phy_chan_num * D40_DREG_PCDELTA + D40_CHAN_REG_SDLNK);
|
|
|
|
}
|
|
|
|
/* DMA logical lli operations */
|
|
|
|
void d40_log_fill_lli(struct d40_log_lli *lli,
|
|
dma_addr_t data, u32 data_size,
|
|
u32 lli_next_off, u32 reg_cfg,
|
|
u32 data_width,
|
|
bool term_int, bool addr_inc)
|
|
{
|
|
lli->lcsp13 = reg_cfg;
|
|
|
|
/* The number of elements to transfer */
|
|
lli->lcsp02 = ((data_size >> data_width) <<
|
|
D40_MEM_LCSP0_ECNT_POS) & D40_MEM_LCSP0_ECNT_MASK;
|
|
/* 16 LSBs address of the current element */
|
|
lli->lcsp02 |= data & D40_MEM_LCSP0_SPTR_MASK;
|
|
/* 16 MSBs address of the current element */
|
|
lli->lcsp13 |= data & D40_MEM_LCSP1_SPTR_MASK;
|
|
|
|
if (addr_inc)
|
|
lli->lcsp13 |= D40_MEM_LCSP1_SCFG_INCR_MASK;
|
|
|
|
lli->lcsp13 |= D40_MEM_LCSP3_DTCP_MASK;
|
|
/* If this scatter list entry is the last one, no next link */
|
|
lli->lcsp13 |= (lli_next_off << D40_MEM_LCSP1_SLOS_POS) &
|
|
D40_MEM_LCSP1_SLOS_MASK;
|
|
|
|
if (term_int)
|
|
lli->lcsp13 |= D40_MEM_LCSP1_SCFG_TIM_MASK;
|
|
else
|
|
lli->lcsp13 &= ~D40_MEM_LCSP1_SCFG_TIM_MASK;
|
|
}
|
|
|
|
int d40_log_sg_to_dev(struct d40_lcla_elem *lcla,
|
|
struct scatterlist *sg,
|
|
int sg_len,
|
|
struct d40_log_lli_bidir *lli,
|
|
struct d40_def_lcsp *lcsp,
|
|
u32 src_data_width,
|
|
u32 dst_data_width,
|
|
enum dma_data_direction direction,
|
|
bool term_int, dma_addr_t dev_addr, int max_len,
|
|
int llis_per_log)
|
|
{
|
|
int total_size = 0;
|
|
struct scatterlist *current_sg = sg;
|
|
int i;
|
|
u32 next_lli_off_dst = 0;
|
|
u32 next_lli_off_src = 0;
|
|
|
|
for_each_sg(sg, current_sg, sg_len, i) {
|
|
total_size += sg_dma_len(current_sg);
|
|
|
|
/*
|
|
* If this scatter list entry is the last one or
|
|
* max length, terminate link.
|
|
*/
|
|
if (sg_len - 1 == i || ((i+1) % max_len == 0)) {
|
|
next_lli_off_src = 0;
|
|
next_lli_off_dst = 0;
|
|
} else {
|
|
if (next_lli_off_dst == 0 &&
|
|
next_lli_off_src == 0) {
|
|
/* The first lli will be at next_lli_off */
|
|
next_lli_off_dst = (lcla->dst_id *
|
|
llis_per_log + 1);
|
|
next_lli_off_src = (lcla->src_id *
|
|
llis_per_log + 1);
|
|
} else {
|
|
next_lli_off_dst++;
|
|
next_lli_off_src++;
|
|
}
|
|
}
|
|
|
|
if (direction == DMA_TO_DEVICE) {
|
|
d40_log_fill_lli(&lli->src[i],
|
|
sg_phys(current_sg),
|
|
sg_dma_len(current_sg),
|
|
next_lli_off_src,
|
|
lcsp->lcsp1, src_data_width,
|
|
false,
|
|
true);
|
|
d40_log_fill_lli(&lli->dst[i],
|
|
dev_addr,
|
|
sg_dma_len(current_sg),
|
|
next_lli_off_dst,
|
|
lcsp->lcsp3, dst_data_width,
|
|
/* No next == terminal interrupt */
|
|
term_int && !next_lli_off_dst,
|
|
false);
|
|
} else {
|
|
d40_log_fill_lli(&lli->dst[i],
|
|
sg_phys(current_sg),
|
|
sg_dma_len(current_sg),
|
|
next_lli_off_dst,
|
|
lcsp->lcsp3, dst_data_width,
|
|
/* No next == terminal interrupt */
|
|
term_int && !next_lli_off_dst,
|
|
true);
|
|
d40_log_fill_lli(&lli->src[i],
|
|
dev_addr,
|
|
sg_dma_len(current_sg),
|
|
next_lli_off_src,
|
|
lcsp->lcsp1, src_data_width,
|
|
false,
|
|
false);
|
|
}
|
|
}
|
|
return total_size;
|
|
}
|
|
|
|
int d40_log_sg_to_lli(int lcla_id,
|
|
struct scatterlist *sg,
|
|
int sg_len,
|
|
struct d40_log_lli *lli_sg,
|
|
u32 lcsp13, /* src or dst*/
|
|
u32 data_width,
|
|
bool term_int, int max_len, int llis_per_log)
|
|
{
|
|
int total_size = 0;
|
|
struct scatterlist *current_sg = sg;
|
|
int i;
|
|
u32 next_lli_off = 0;
|
|
|
|
for_each_sg(sg, current_sg, sg_len, i) {
|
|
total_size += sg_dma_len(current_sg);
|
|
|
|
/*
|
|
* If this scatter list entry is the last one or
|
|
* max length, terminate link.
|
|
*/
|
|
if (sg_len - 1 == i || ((i+1) % max_len == 0))
|
|
next_lli_off = 0;
|
|
else {
|
|
if (next_lli_off == 0)
|
|
/* The first lli will be at next_lli_off */
|
|
next_lli_off = lcla_id * llis_per_log + 1;
|
|
else
|
|
next_lli_off++;
|
|
}
|
|
|
|
d40_log_fill_lli(&lli_sg[i],
|
|
sg_phys(current_sg),
|
|
sg_dma_len(current_sg),
|
|
next_lli_off,
|
|
lcsp13, data_width,
|
|
term_int && !next_lli_off,
|
|
true);
|
|
}
|
|
return total_size;
|
|
}
|
|
|
|
int d40_log_lli_write(struct d40_log_lli_full *lcpa,
|
|
struct d40_log_lli *lcla_src,
|
|
struct d40_log_lli *lcla_dst,
|
|
struct d40_log_lli *lli_dst,
|
|
struct d40_log_lli *lli_src,
|
|
int llis_per_log)
|
|
{
|
|
u32 slos;
|
|
u32 dlos;
|
|
int i;
|
|
|
|
writel(lli_src->lcsp02, &lcpa->lcsp0);
|
|
writel(lli_src->lcsp13, &lcpa->lcsp1);
|
|
writel(lli_dst->lcsp02, &lcpa->lcsp2);
|
|
writel(lli_dst->lcsp13, &lcpa->lcsp3);
|
|
|
|
slos = lli_src->lcsp13 & D40_MEM_LCSP1_SLOS_MASK;
|
|
dlos = lli_dst->lcsp13 & D40_MEM_LCSP3_DLOS_MASK;
|
|
|
|
for (i = 0; (i < llis_per_log) && slos && dlos; i++) {
|
|
writel(lli_src[i + 1].lcsp02, &lcla_src[i].lcsp02);
|
|
writel(lli_src[i + 1].lcsp13, &lcla_src[i].lcsp13);
|
|
writel(lli_dst[i + 1].lcsp02, &lcla_dst[i].lcsp02);
|
|
writel(lli_dst[i + 1].lcsp13, &lcla_dst[i].lcsp13);
|
|
|
|
slos = lli_src[i + 1].lcsp13 & D40_MEM_LCSP1_SLOS_MASK;
|
|
dlos = lli_dst[i + 1].lcsp13 & D40_MEM_LCSP3_DLOS_MASK;
|
|
}
|
|
|
|
return i;
|
|
|
|
}
|