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|
// SPDX-License-Identifier: GPL-2.0
//
// Copyright (C) 2017-2018 Socionext Inc.
// Author: Masahiro Yamada <yamada.masahiro@socionext.com>
#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/mfd/tmio.h>
#include <linux/mmc/host.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include "tmio_mmc.h"
#define UNIPHIER_SD_CLK_CTL_DIV1024 BIT(16)
#define UNIPHIER_SD_CLK_CTL_DIV1 BIT(10)
#define UNIPHIER_SD_CLKCTL_OFFEN BIT(9) // auto SDCLK stop
#define UNIPHIER_SD_CC_EXT_MODE 0x1b0
#define UNIPHIER_SD_CC_EXT_MODE_DMA BIT(1)
#define UNIPHIER_SD_HOST_MODE 0x1c8
#define UNIPHIER_SD_VOLT 0x1e4
#define UNIPHIER_SD_VOLT_MASK GENMASK(1, 0)
#define UNIPHIER_SD_VOLT_OFF 0
#define UNIPHIER_SD_VOLT_330 1 // 3.3V signal
#define UNIPHIER_SD_VOLT_180 2 // 1.8V signal
#define UNIPHIER_SD_DMA_MODE 0x410
#define UNIPHIER_SD_DMA_MODE_DIR_MASK GENMASK(17, 16)
#define UNIPHIER_SD_DMA_MODE_DIR_TO_DEV 0
#define UNIPHIER_SD_DMA_MODE_DIR_FROM_DEV 1
#define UNIPHIER_SD_DMA_MODE_WIDTH_MASK GENMASK(5, 4)
#define UNIPHIER_SD_DMA_MODE_WIDTH_8 0
#define UNIPHIER_SD_DMA_MODE_WIDTH_16 1
#define UNIPHIER_SD_DMA_MODE_WIDTH_32 2
#define UNIPHIER_SD_DMA_MODE_WIDTH_64 3
#define UNIPHIER_SD_DMA_MODE_ADDR_INC BIT(0) // 1: inc, 0: fixed
#define UNIPHIER_SD_DMA_CTL 0x414
#define UNIPHIER_SD_DMA_CTL_START BIT(0) // start DMA (auto cleared)
#define UNIPHIER_SD_DMA_RST 0x418
#define UNIPHIER_SD_DMA_RST_CH1 BIT(9)
#define UNIPHIER_SD_DMA_RST_CH0 BIT(8)
#define UNIPHIER_SD_DMA_ADDR_L 0x440
#define UNIPHIER_SD_DMA_ADDR_H 0x444
/*
* IP is extended to support various features: built-in DMA engine,
* 1/1024 divisor, etc.
*/
#define UNIPHIER_SD_CAP_EXTENDED_IP BIT(0)
/* RX channel of the built-in DMA controller is broken (Pro5) */
#define UNIPHIER_SD_CAP_BROKEN_DMA_RX BIT(1)
struct uniphier_sd_priv {
struct tmio_mmc_data tmio_data;
struct pinctrl *pinctrl;
struct pinctrl_state *pinstate_default;
struct pinctrl_state *pinstate_uhs;
struct clk *clk;
struct reset_control *rst;
struct reset_control *rst_br;
struct reset_control *rst_hw;
struct dma_chan *chan;
enum dma_data_direction dma_dir;
unsigned long clk_rate;
unsigned long caps;
};
static void *uniphier_sd_priv(struct tmio_mmc_host *host)
{
return container_of(host->pdata, struct uniphier_sd_priv, tmio_data);
}
static void uniphier_sd_dma_endisable(struct tmio_mmc_host *host, int enable)
{
sd_ctrl_write16(host, CTL_DMA_ENABLE, enable ? DMA_ENABLE_DMASDRW : 0);
}
/* external DMA engine */
static void uniphier_sd_external_dma_issue(unsigned long arg)
{
struct tmio_mmc_host *host = (void *)arg;
struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
uniphier_sd_dma_endisable(host, 1);
dma_async_issue_pending(priv->chan);
}
static void uniphier_sd_external_dma_callback(void *param,
const struct dmaengine_result *result)
{
struct tmio_mmc_host *host = param;
struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
unsigned long flags;
dma_unmap_sg(mmc_dev(host->mmc), host->sg_ptr, host->sg_len,
priv->dma_dir);
spin_lock_irqsave(&host->lock, flags);
if (result->result == DMA_TRANS_NOERROR) {
/*
* When the external DMA engine is enabled, strangely enough,
* the DATAEND flag can be asserted even if the DMA engine has
* not been kicked yet. Enable the TMIO_STAT_DATAEND irq only
* after we make sure the DMA engine finishes the transfer,
* hence, in this callback.
*/
tmio_mmc_enable_mmc_irqs(host, TMIO_STAT_DATAEND);
} else {
host->data->error = -ETIMEDOUT;
tmio_mmc_do_data_irq(host);
}
spin_unlock_irqrestore(&host->lock, flags);
}
static void uniphier_sd_external_dma_start(struct tmio_mmc_host *host,
struct mmc_data *data)
{
struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
enum dma_transfer_direction dma_tx_dir;
struct dma_async_tx_descriptor *desc;
dma_cookie_t cookie;
int sg_len;
if (!priv->chan)
goto force_pio;
if (data->flags & MMC_DATA_READ) {
priv->dma_dir = DMA_FROM_DEVICE;
dma_tx_dir = DMA_DEV_TO_MEM;
} else {
priv->dma_dir = DMA_TO_DEVICE;
dma_tx_dir = DMA_MEM_TO_DEV;
}
sg_len = dma_map_sg(mmc_dev(host->mmc), host->sg_ptr, host->sg_len,
priv->dma_dir);
if (sg_len == 0)
goto force_pio;
desc = dmaengine_prep_slave_sg(priv->chan, host->sg_ptr, sg_len,
dma_tx_dir, DMA_CTRL_ACK);
if (!desc)
goto unmap_sg;
desc->callback_result = uniphier_sd_external_dma_callback;
desc->callback_param = host;
cookie = dmaengine_submit(desc);
if (cookie < 0)
goto unmap_sg;
host->dma_on = true;
return;
unmap_sg:
dma_unmap_sg(mmc_dev(host->mmc), host->sg_ptr, host->sg_len,
priv->dma_dir);
force_pio:
uniphier_sd_dma_endisable(host, 0);
}
static void uniphier_sd_external_dma_enable(struct tmio_mmc_host *host,
bool enable)
{
}
static void uniphier_sd_external_dma_request(struct tmio_mmc_host *host,
struct tmio_mmc_data *pdata)
{
struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
struct dma_chan *chan;
chan = dma_request_chan(mmc_dev(host->mmc), "rx-tx");
if (IS_ERR(chan)) {
dev_warn(mmc_dev(host->mmc),
"failed to request DMA channel. falling back to PIO\n");
return; /* just use PIO even for -EPROBE_DEFER */
}
/* this driver uses a single channel for both RX an TX */
priv->chan = chan;
host->chan_rx = chan;
host->chan_tx = chan;
tasklet_init(&host->dma_issue, uniphier_sd_external_dma_issue,
(unsigned long)host);
}
static void uniphier_sd_external_dma_release(struct tmio_mmc_host *host)
{
struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
if (priv->chan)
dma_release_channel(priv->chan);
}
static void uniphier_sd_external_dma_abort(struct tmio_mmc_host *host)
{
struct uniphier_sd_priv *priv = uniphier_sd_priv(host);
uniphier_sd_dma_endisable(host, 0);
if (priv->chan)
dmaengine_terminate_sync(priv->chan);
}
static void uniphier_sd_external_dma_dataend(struct tmio_mmc_host *host)
{
uniphier_sd_dma_endisable(host, 0);
tmio_mmc_do_data_irq(host);
}
static const struct tmio_mmc_dma_ops uniphier_sd_external_dma_ops = {
.start = uniphier_sd_external_dma_start,
.enable = uniphier_sd_external_dma_enable,
.request = uniphier_sd_external_dma_request,
.release = uniphier_sd_external_dma_release,
.abort = uniphier_sd_external_dma_abort,
.dataend = uniphier_sd_external_dma_dataend,
};
static void uniphier_sd_internal_dma_issue(unsigned long arg)
{
struct tmio_mmc_host
|