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linux/drivers/mmc/host/renesas_sdhi_sys_dmac.c
Simon Horman d6dc425ae5 mmc: renesas_sdhi: implement R-Car Gen[123] fallback compatibility strings 
Implement fallback compatibility strings for R-Car Gen 1, 2 and 3.

In the case of Renesas R-Car hardware we know that there are generations of
SoCs, f.e. Gen 1 and 2. But beyond that its not clear what the relationship
between IP blocks might be. For example, I believe that r8a7790 is older
than r8a7791 but that doesn't imply that the latter is a descendant of the
former or vice versa.

We can, however, by examining the documentation and behaviour of the
hardware at run-time observe that the current driver implementation appears
to be compatible with the IP blocks on SoCs within a given generation.

For the above reasons and convenience when enabling new SoCs a
per-generation fallback compatibility string scheme is being adopted for
drivers for Renesas SoCs.

Also, improve readability by listing the shmobile fallback compatibility
string after the more-specific compatibility strings they provide a
fallback for.

Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2017-10-30 11:50:40 +01:00

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/*
* 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");
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