514 lines
14 KiB
C
514 lines
14 KiB
C
/*
|
|
* DMA support use of SYS DMAC with SDHI SD/SDIO controller
|
|
*
|
|
* Copyright (C) 2016-17 Renesas Electronics Corporation
|
|
* Copyright (C) 2016-17 Sang Engineering, Wolfram Sang
|
|
* Copyright (C) 2017 Horms Solutions, Simon Horman
|
|
* Copyright (C) 2010-2011 Guennadi Liakhovetski
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/dmaengine.h>
|
|
#include <linux/mfd/tmio.h>
|
|
#include <linux/mmc/host.h>
|
|
#include <linux/mod_devicetable.h>
|
|
#include <linux/module.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/sys_soc.h>
|
|
|
|
#include "renesas_sdhi.h"
|
|
#include "tmio_mmc.h"
|
|
|
|
#define TMIO_MMC_MIN_DMA_LEN 8
|
|
|
|
static const struct renesas_sdhi_of_data of_default_cfg = {
|
|
.tmio_flags = TMIO_MMC_HAS_IDLE_WAIT,
|
|
};
|
|
|
|
static const struct renesas_sdhi_of_data of_rz_compatible = {
|
|
.tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_32BIT_DATA_PORT |
|
|
TMIO_MMC_HAVE_CBSY,
|
|
.tmio_ocr_mask = MMC_VDD_32_33,
|
|
.capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
|
|
};
|
|
|
|
static const struct renesas_sdhi_of_data of_rcar_gen1_compatible = {
|
|
.tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE |
|
|
TMIO_MMC_CLK_ACTUAL,
|
|
.capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ,
|
|
};
|
|
|
|
/* Definitions for sampling clocks */
|
|
static struct renesas_sdhi_scc rcar_gen2_scc_taps[] = {
|
|
{
|
|
.clk_rate = 156000000,
|
|
.tap = 0x00000703,
|
|
},
|
|
{
|
|
.clk_rate = 0,
|
|
.tap = 0x00000300,
|
|
},
|
|
};
|
|
|
|
static const struct renesas_sdhi_of_data of_rcar_gen2_compatible = {
|
|
.tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE |
|
|
TMIO_MMC_CLK_ACTUAL | TMIO_MMC_HAVE_CBSY |
|
|
TMIO_MMC_MIN_RCAR2,
|
|
.capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ |
|
|
MMC_CAP_CMD23,
|
|
.dma_buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES,
|
|
.dma_rx_offset = 0x2000,
|
|
.scc_offset = 0x0300,
|
|
.taps = rcar_gen2_scc_taps,
|
|
.taps_num = ARRAY_SIZE(rcar_gen2_scc_taps),
|
|
};
|
|
|
|
/* Definitions for sampling clocks */
|
|
static struct renesas_sdhi_scc rcar_gen3_scc_taps[] = {
|
|
{
|
|
.clk_rate = 0,
|
|
.tap = 0x00000300,
|
|
},
|
|
};
|
|
|
|
static const struct renesas_sdhi_of_data of_rcar_gen3_compatible = {
|
|
.tmio_flags = TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_WRPROTECT_DISABLE |
|
|
TMIO_MMC_CLK_ACTUAL | TMIO_MMC_HAVE_CBSY |
|
|
TMIO_MMC_MIN_RCAR2,
|
|
.capabilities = MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ |
|
|
MMC_CAP_CMD23,
|
|
.bus_shift = 2,
|
|
.scc_offset = 0x1000,
|
|
.taps = rcar_gen3_scc_taps,
|
|
.taps_num = ARRAY_SIZE(rcar_gen3_scc_taps),
|
|
};
|
|
|
|
static const struct of_device_id renesas_sdhi_sys_dmac_of_match[] = {
|
|
{ .compatible = "renesas,sdhi-sh73a0", .data = &of_default_cfg, },
|
|
{ .compatible = "renesas,sdhi-r8a73a4", .data = &of_default_cfg, },
|
|
{ .compatible = "renesas,sdhi-r8a7740", .data = &of_default_cfg, },
|
|
{ .compatible = "renesas,sdhi-r7s72100", .data = &of_rz_compatible, },
|
|
{ .compatible = "renesas,sdhi-r8a7778", .data = &of_rcar_gen1_compatible, },
|
|
{ .compatible = "renesas,sdhi-r8a7779", .data = &of_rcar_gen1_compatible, },
|
|
{ .compatible = "renesas,sdhi-r8a7743", .data = &of_rcar_gen2_compatible, },
|
|
{ .compatible = "renesas,sdhi-r8a7745", .data = &of_rcar_gen2_compatible, },
|
|
{ .compatible = "renesas,sdhi-r8a7790", .data = &of_rcar_gen2_compatible, },
|
|
{ .compatible = "renesas,sdhi-r8a7791", .data = &of_rcar_gen2_compatible, },
|
|
{ .compatible = "renesas,sdhi-r8a7792", .data = &of_rcar_gen2_compatible, },
|
|
{ .compatible = "renesas,sdhi-r8a7793", .data = &of_rcar_gen2_compatible, },
|
|
{ .compatible = "renesas,sdhi-r8a7794", .data = &of_rcar_gen2_compatible, },
|
|
{ .compatible = "renesas,sdhi-r8a7795", .data = &of_rcar_gen3_compatible, },
|
|
{ .compatible = "renesas,sdhi-r8a7796", .data = &of_rcar_gen3_compatible, },
|
|
{ .compatible = "renesas,rcar-gen1-sdhi", .data = &of_rcar_gen1_compatible, },
|
|
{ .compatible = "renesas,rcar-gen2-sdhi", .data = &of_rcar_gen2_compatible, },
|
|
{ .compatible = "renesas,rcar-gen3-sdhi", .data = &of_rcar_gen3_compatible, },
|
|
{ .compatible = "renesas,sdhi-shmobile" },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, renesas_sdhi_sys_dmac_of_match);
|
|
|
|
static void renesas_sdhi_sys_dmac_enable_dma(struct tmio_mmc_host *host,
|
|
bool enable)
|
|
{
|
|
if (!host->chan_tx || !host->chan_rx)
|
|
return;
|
|
|
|
if (host->dma->enable)
|
|
host->dma->enable(host, enable);
|
|
}
|
|
|
|
static void renesas_sdhi_sys_dmac_abort_dma(struct tmio_mmc_host *host)
|
|
{
|
|
renesas_sdhi_sys_dmac_enable_dma(host, false);
|
|
|
|
if (host->chan_rx)
|
|
dmaengine_terminate_all(host->chan_rx);
|
|
if (host->chan_tx)
|
|
dmaengine_terminate_all(host->chan_tx);
|
|
|
|
renesas_sdhi_sys_dmac_enable_dma(host, true);
|
|
}
|
|
|
|
static void renesas_sdhi_sys_dmac_dataend_dma(struct tmio_mmc_host *host)
|
|
{
|
|
complete(&host->dma_dataend);
|
|
}
|
|
|
|
static void renesas_sdhi_sys_dmac_dma_callback(void *arg)
|
|
{
|
|
struct tmio_mmc_host *host = arg;
|
|
|
|
spin_lock_irq(&host->lock);
|
|
|
|
if (!host->data)
|
|
goto out;
|
|
|
|
if (host->data->flags & MMC_DATA_READ)
|
|
dma_unmap_sg(host->chan_rx->device->dev,
|
|
host->sg_ptr, host->sg_len,
|
|
DMA_FROM_DEVICE);
|
|
else
|
|
dma_unmap_sg(host->chan_tx->device->dev,
|
|
host->sg_ptr, host->sg_len,
|
|
DMA_TO_DEVICE);
|
|
|
|
spin_unlock_irq(&host->lock);
|
|
|
|
wait_for_completion(&host->dma_dataend);
|
|
|
|
spin_lock_irq(&host->lock);
|
|
tmio_mmc_do_data_irq(host);
|
|
out:
|
|
spin_unlock_irq(&host->lock);
|
|
}
|
|
|
|
static void renesas_sdhi_sys_dmac_start_dma_rx(struct tmio_mmc_host *host)
|
|
{
|
|
struct scatterlist *sg = host->sg_ptr, *sg_tmp;
|
|
struct dma_async_tx_descriptor *desc = NULL;
|
|
struct dma_chan *chan = host->chan_rx;
|
|
dma_cookie_t cookie;
|
|
int ret, i;
|
|
bool aligned = true, multiple = true;
|
|
unsigned int align = (1 << host->pdata->alignment_shift) - 1;
|
|
|
|
for_each_sg(sg, sg_tmp, host->sg_len, i) {
|
|
if (sg_tmp->offset & align)
|
|
aligned = false;
|
|
if (sg_tmp->length & align) {
|
|
multiple = false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_SIZE ||
|
|
(align & PAGE_MASK))) || !multiple) {
|
|
ret = -EINVAL;
|
|
goto pio;
|
|
}
|
|
|
|
if (sg->length < TMIO_MMC_MIN_DMA_LEN) {
|
|
host->force_pio = true;
|
|
return;
|
|
}
|
|
|
|
tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_RXRDY);
|
|
|
|
/* The only sg element can be unaligned, use our bounce buffer then */
|
|
if (!aligned) {
|
|
sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length);
|
|
host->sg_ptr = &host->bounce_sg;
|
|
sg = host->sg_ptr;
|
|
}
|
|
|
|
ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_FROM_DEVICE);
|
|
if (ret > 0)
|
|
desc = dmaengine_prep_slave_sg(chan, sg, ret, DMA_DEV_TO_MEM,
|
|
DMA_CTRL_ACK);
|
|
|
|
if (desc) {
|
|
reinit_completion(&host->dma_dataend);
|
|
desc->callback = renesas_sdhi_sys_dmac_dma_callback;
|
|
desc->callback_param = host;
|
|
|
|
cookie = dmaengine_submit(desc);
|
|
if (cookie < 0) {
|
|
desc = NULL;
|
|
ret = cookie;
|
|
}
|
|
}
|
|
pio:
|
|
if (!desc) {
|
|
/* DMA failed, fall back to PIO */
|
|
renesas_sdhi_sys_dmac_enable_dma(host, false);
|
|
if (ret >= 0)
|
|
ret = -EIO;
|
|
host->chan_rx = NULL;
|
|
dma_release_channel(chan);
|
|
/* Free the Tx channel too */
|
|
chan = host->chan_tx;
|
|
if (chan) {
|
|
host->chan_tx = NULL;
|
|
dma_release_channel(chan);
|
|
}
|
|
dev_warn(&host->pdev->dev,
|
|
"DMA failed: %d, falling back to PIO\n", ret);
|
|
}
|
|
}
|
|
|
|
static void renesas_sdhi_sys_dmac_start_dma_tx(struct tmio_mmc_host *host)
|
|
{
|
|
struct scatterlist *sg = host->sg_ptr, *sg_tmp;
|
|
struct dma_async_tx_descriptor *desc = NULL;
|
|
struct dma_chan *chan = host->chan_tx;
|
|
dma_cookie_t cookie;
|
|
int ret, i;
|
|
bool aligned = true, multiple = true;
|
|
unsigned int align = (1 << host->pdata->alignment_shift) - 1;
|
|
|
|
for_each_sg(sg, sg_tmp, host->sg_len, i) {
|
|
if (sg_tmp->offset & align)
|
|
aligned = false;
|
|
if (sg_tmp->length & align) {
|
|
multiple = false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_SIZE ||
|
|
(align & PAGE_MASK))) || !multiple) {
|
|
ret = -EINVAL;
|
|
goto pio;
|
|
}
|
|
|
|
if (sg->length < TMIO_MMC_MIN_DMA_LEN) {
|
|
host->force_pio = true;
|
|
return;
|
|
}
|
|
|
|
tmio_mmc_disable_mmc_irqs(host, TMIO_STAT_TXRQ);
|
|
|
|
/* The only sg element can be unaligned, use our bounce buffer then */
|
|
if (!aligned) {
|
|
unsigned long flags;
|
|
void *sg_vaddr = tmio_mmc_kmap_atomic(sg, &flags);
|
|
|
|
sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length);
|
|
memcpy(host->bounce_buf, sg_vaddr, host->bounce_sg.length);
|
|
tmio_mmc_kunmap_atomic(sg, &flags, sg_vaddr);
|
|
host->sg_ptr = &host->bounce_sg;
|
|
sg = host->sg_ptr;
|
|
}
|
|
|
|
ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_TO_DEVICE);
|
|
if (ret > 0)
|
|
desc = dmaengine_prep_slave_sg(chan, sg, ret, DMA_MEM_TO_DEV,
|
|
DMA_CTRL_ACK);
|
|
|
|
if (desc) {
|
|
reinit_completion(&host->dma_dataend);
|
|
desc->callback = renesas_sdhi_sys_dmac_dma_callback;
|
|
desc->callback_param = host;
|
|
|
|
cookie = dmaengine_submit(desc);
|
|
if (cookie < 0) {
|
|
desc = NULL;
|
|
ret = cookie;
|
|
}
|
|
}
|
|
pio:
|
|
if (!desc) {
|
|
/* DMA failed, fall back to PIO */
|
|
renesas_sdhi_sys_dmac_enable_dma(host, false);
|
|
if (ret >= 0)
|
|
ret = -EIO;
|
|
host->chan_tx = NULL;
|
|
dma_release_channel(chan);
|
|
/* Free the Rx channel too */
|
|
chan = host->chan_rx;
|
|
if (chan) {
|
|
host->chan_rx = NULL;
|
|
dma_release_channel(chan);
|
|
}
|
|
dev_warn(&host->pdev->dev,
|
|
"DMA failed: %d, falling back to PIO\n", ret);
|
|
}
|
|
}
|
|
|
|
static void renesas_sdhi_sys_dmac_start_dma(struct tmio_mmc_host *host,
|
|
struct mmc_data *data)
|
|
{
|
|
if (data->flags & MMC_DATA_READ) {
|
|
if (host->chan_rx)
|
|
renesas_sdhi_sys_dmac_start_dma_rx(host);
|
|
} else {
|
|
if (host->chan_tx)
|
|
renesas_sdhi_sys_dmac_start_dma_tx(host);
|
|
}
|
|
}
|
|
|
|
static void renesas_sdhi_sys_dmac_issue_tasklet_fn(unsigned long priv)
|
|
{
|
|
struct tmio_mmc_host *host = (struct tmio_mmc_host *)priv;
|
|
struct dma_chan *chan = NULL;
|
|
|
|
spin_lock_irq(&host->lock);
|
|
|
|
if (host && host->data) {
|
|
if (host->data->flags & MMC_DATA_READ)
|
|
chan = host->chan_rx;
|
|
else
|
|
chan = host->chan_tx;
|
|
}
|
|
|
|
spin_unlock_irq(&host->lock);
|
|
|
|
tmio_mmc_enable_mmc_irqs(host, TMIO_STAT_DATAEND);
|
|
|
|
if (chan)
|
|
dma_async_issue_pending(chan);
|
|
}
|
|
|
|
static void renesas_sdhi_sys_dmac_request_dma(struct tmio_mmc_host *host,
|
|
struct tmio_mmc_data *pdata)
|
|
{
|
|
/* We can only either use DMA for both Tx and Rx or not use it at all */
|
|
if (!host->dma || (!host->pdev->dev.of_node &&
|
|
(!pdata->chan_priv_tx || !pdata->chan_priv_rx)))
|
|
return;
|
|
|
|
if (!host->chan_tx && !host->chan_rx) {
|
|
struct resource *res = platform_get_resource(host->pdev,
|
|
IORESOURCE_MEM, 0);
|
|
struct dma_slave_config cfg = {};
|
|
dma_cap_mask_t mask;
|
|
int ret;
|
|
|
|
if (!res)
|
|
return;
|
|
|
|
dma_cap_zero(mask);
|
|
dma_cap_set(DMA_SLAVE, mask);
|
|
|
|
host->chan_tx = dma_request_slave_channel_compat(mask,
|
|
host->dma->filter, pdata->chan_priv_tx,
|
|
&host->pdev->dev, "tx");
|
|
dev_dbg(&host->pdev->dev, "%s: TX: got channel %p\n", __func__,
|
|
host->chan_tx);
|
|
|
|
if (!host->chan_tx)
|
|
return;
|
|
|
|
cfg.direction = DMA_MEM_TO_DEV;
|
|
cfg.dst_addr = res->start +
|
|
(CTL_SD_DATA_PORT << host->bus_shift);
|
|
cfg.dst_addr_width = host->dma->dma_buswidth;
|
|
if (!cfg.dst_addr_width)
|
|
cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
|
|
cfg.src_addr = 0;
|
|
ret = dmaengine_slave_config(host->chan_tx, &cfg);
|
|
if (ret < 0)
|
|
goto ecfgtx;
|
|
|
|
host->chan_rx = dma_request_slave_channel_compat(mask,
|
|
host->dma->filter, pdata->chan_priv_rx,
|
|
&host->pdev->dev, "rx");
|
|
dev_dbg(&host->pdev->dev, "%s: RX: got channel %p\n", __func__,
|
|
host->chan_rx);
|
|
|
|
if (!host->chan_rx)
|
|
goto ereqrx;
|
|
|
|
cfg.direction = DMA_DEV_TO_MEM;
|
|
cfg.src_addr = cfg.dst_addr + host->pdata->dma_rx_offset;
|
|
cfg.src_addr_width = host->dma->dma_buswidth;
|
|
if (!cfg.src_addr_width)
|
|
cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
|
|
cfg.dst_addr = 0;
|
|
ret = dmaengine_slave_config(host->chan_rx, &cfg);
|
|
if (ret < 0)
|
|
goto ecfgrx;
|
|
|
|
host->bounce_buf = (u8 *)__get_free_page(GFP_KERNEL | GFP_DMA);
|
|
if (!host->bounce_buf)
|
|
goto ebouncebuf;
|
|
|
|
init_completion(&host->dma_dataend);
|
|
tasklet_init(&host->dma_issue,
|
|
renesas_sdhi_sys_dmac_issue_tasklet_fn,
|
|
(unsigned long)host);
|
|
}
|
|
|
|
renesas_sdhi_sys_dmac_enable_dma(host, true);
|
|
|
|
return;
|
|
|
|
ebouncebuf:
|
|
ecfgrx:
|
|
dma_release_channel(host->chan_rx);
|
|
host->chan_rx = NULL;
|
|
ereqrx:
|
|
ecfgtx:
|
|
dma_release_channel(host->chan_tx);
|
|
host->chan_tx = NULL;
|
|
}
|
|
|
|
static void renesas_sdhi_sys_dmac_release_dma(struct tmio_mmc_host *host)
|
|
{
|
|
if (host->chan_tx) {
|
|
struct dma_chan *chan = host->chan_tx;
|
|
|
|
host->chan_tx = NULL;
|
|
dma_release_channel(chan);
|
|
}
|
|
if (host->chan_rx) {
|
|
struct dma_chan *chan = host->chan_rx;
|
|
|
|
host->chan_rx = NULL;
|
|
dma_release_channel(chan);
|
|
}
|
|
if (host->bounce_buf) {
|
|
free_pages((unsigned long)host->bounce_buf, 0);
|
|
host->bounce_buf = NULL;
|
|
}
|
|
}
|
|
|
|
static const struct tmio_mmc_dma_ops renesas_sdhi_sys_dmac_dma_ops = {
|
|
.start = renesas_sdhi_sys_dmac_start_dma,
|
|
.enable = renesas_sdhi_sys_dmac_enable_dma,
|
|
.request = renesas_sdhi_sys_dmac_request_dma,
|
|
.release = renesas_sdhi_sys_dmac_release_dma,
|
|
.abort = renesas_sdhi_sys_dmac_abort_dma,
|
|
.dataend = renesas_sdhi_sys_dmac_dataend_dma,
|
|
};
|
|
|
|
/*
|
|
* Whitelist of specific R-Car Gen3 SoC ES versions to use this DMAC
|
|
* implementation. Currently empty as all supported ES versions use
|
|
* the internal DMAC.
|
|
*/
|
|
static const struct soc_device_attribute gen3_soc_whitelist[] = {
|
|
{ /* sentinel */ }
|
|
};
|
|
|
|
static int renesas_sdhi_sys_dmac_probe(struct platform_device *pdev)
|
|
{
|
|
if (of_device_get_match_data(&pdev->dev) == &of_rcar_gen3_compatible &&
|
|
!soc_device_match(gen3_soc_whitelist))
|
|
return -ENODEV;
|
|
|
|
return renesas_sdhi_probe(pdev, &renesas_sdhi_sys_dmac_dma_ops);
|
|
}
|
|
|
|
static const struct dev_pm_ops renesas_sdhi_sys_dmac_dev_pm_ops = {
|
|
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
|
|
pm_runtime_force_resume)
|
|
SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
|
|
tmio_mmc_host_runtime_resume,
|
|
NULL)
|
|
};
|
|
|
|
static struct platform_driver renesas_sys_dmac_sdhi_driver = {
|
|
.driver = {
|
|
.name = "sh_mobile_sdhi",
|
|
.pm = &renesas_sdhi_sys_dmac_dev_pm_ops,
|
|
.of_match_table = renesas_sdhi_sys_dmac_of_match,
|
|
},
|
|
.probe = renesas_sdhi_sys_dmac_probe,
|
|
.remove = renesas_sdhi_remove,
|
|
};
|
|
|
|
module_platform_driver(renesas_sys_dmac_sdhi_driver);
|
|
|
|
MODULE_DESCRIPTION("Renesas SDHI driver");
|
|
MODULE_AUTHOR("Magnus Damm");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:sh_mobile_sdhi");
|