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OpenCloudOS-Kernel/drivers/mmc/host/renesas_sdhi_core.c

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/*
* Renesas SDHI
*
* Copyright (C) 2015-17 Renesas Electronics Corporation
* Copyright (C) 2016-17 Sang Engineering, Wolfram Sang
* Copyright (C) 2016-17 Horms Solutions, Simon Horman
* Copyright (C) 2009 Magnus Damm
*
* 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.
*
* Based on "Compaq ASIC3 support":
*
* Copyright 2001 Compaq Computer Corporation.
* Copyright 2004-2005 Phil Blundell
* Copyright 2007-2008 OpenedHand Ltd.
*
* Authors: Phil Blundell <pb@handhelds.org>,
* Samuel Ortiz <sameo@openedhand.com>
*
*/
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/mmc/host.h>
#include <linux/mfd/tmio.h>
#include <linux/sh_dma.h>
#include <linux/delay.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/pinctrl-state.h>
#include <linux/regulator/consumer.h>
#include "renesas_sdhi.h"
#include "tmio_mmc.h"
#define EXT_ACC 0xe4
#define SDHI_VER_GEN2_SDR50 0x490c
#define SDHI_VER_RZ_A1 0x820b
/* very old datasheets said 0x490c for SDR104, too. They are wrong! */
#define SDHI_VER_GEN2_SDR104 0xcb0d
#define SDHI_VER_GEN3_SD 0xcc10
#define SDHI_VER_GEN3_SDMMC 0xcd10
static void renesas_sdhi_sdbuf_width(struct tmio_mmc_host *host, int width)
{
u32 val;
/*
* see also
* renesas_sdhi_of_data :: dma_buswidth
*/
switch (sd_ctrl_read16(host, CTL_VERSION)) {
case SDHI_VER_GEN2_SDR50:
val = (width == 32) ? 0x0001 : 0x0000;
break;
case SDHI_VER_GEN2_SDR104:
val = (width == 32) ? 0x0000 : 0x0001;
break;
case SDHI_VER_GEN3_SD:
case SDHI_VER_GEN3_SDMMC:
if (width == 64)
val = 0x0000;
else if (width == 32)
val = 0x0101;
else
val = 0x0001;
break;
default:
/* nothing to do */
return;
}
sd_ctrl_write16(host, EXT_ACC, val);
}
static int renesas_sdhi_clk_enable(struct tmio_mmc_host *host)
{
struct mmc_host *mmc = host->mmc;
struct renesas_sdhi *priv = host_to_priv(host);
int ret = clk_prepare_enable(priv->clk);
if (ret < 0)
return ret;
ret = clk_prepare_enable(priv->clk_cd);
if (ret < 0) {
clk_disable_unprepare(priv->clk);
return ret;
}
/*
* The clock driver may not know what maximum frequency
* actually works, so it should be set with the max-frequency
* property which will already have been read to f_max. If it
* was missing, assume the current frequency is the maximum.
*/
if (!mmc->f_max)
mmc->f_max = clk_get_rate(priv->clk);
/*
* Minimum frequency is the minimum input clock frequency
* divided by our maximum divider.
*/
mmc->f_min = max(clk_round_rate(priv->clk, 1) / 512, 1L);
/* enable 16bit data access on SDBUF as default */
renesas_sdhi_sdbuf_width(host, 16);
return 0;
}
static unsigned int renesas_sdhi_clk_update(struct tmio_mmc_host *host,
unsigned int new_clock)
{
struct renesas_sdhi *priv = host_to_priv(host);
unsigned int freq, diff, best_freq = 0, diff_min = ~0;
int i, ret;
/* tested only on R-Car Gen2+ currently; may work for others */
if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2))
return clk_get_rate(priv->clk);
/*
* We want the bus clock to be as close as possible to, but no
* greater than, new_clock. As we can divide by 1 << i for
* any i in [0, 9] we want the input clock to be as close as
* possible, but no greater than, new_clock << i.
*/
for (i = min(9, ilog2(UINT_MAX / new_clock)); i >= 0; i--) {
freq = clk_round_rate(priv->clk, new_clock << i);
if (freq > (new_clock << i)) {
/* Too fast; look for a slightly slower option */
freq = clk_round_rate(priv->clk,
(new_clock << i) / 4 * 3);
if (freq > (new_clock << i))
continue;
}
diff = new_clock - (freq >> i);
if (diff <= diff_min) {
best_freq = freq;
diff_min = diff;
}
}
ret = clk_set_rate(priv->clk, best_freq);
return ret == 0 ? best_freq : clk_get_rate(priv->clk);
}
static void renesas_sdhi_clk_disable(struct tmio_mmc_host *host)
{
struct renesas_sdhi *priv = host_to_priv(host);
clk_disable_unprepare(priv->clk);
clk_disable_unprepare(priv->clk_cd);
}
static int renesas_sdhi_card_busy(struct mmc_host *mmc)
{
struct tmio_mmc_host *host = mmc_priv(mmc);
return !(sd_ctrl_read16_and_16_as_32(host, CTL_STATUS) &
TMIO_STAT_DAT0);
}
static int renesas_sdhi_start_signal_voltage_switch(struct mmc_host *mmc,
struct mmc_ios *ios)
{
struct tmio_mmc_host *host = mmc_priv(mmc);
struct renesas_sdhi *priv = host_to_priv(host);
struct pinctrl_state *pin_state;
int ret;
switch (ios->signal_voltage) {
case MMC_SIGNAL_VOLTAGE_330:
pin_state = priv->pins_default;
break;
case MMC_SIGNAL_VOLTAGE_180:
pin_state = priv->pins_uhs;
break;
default:
return -EINVAL;
}
/*
* If anything is missing, assume signal voltage is fixed at
* 3.3V and succeed/fail accordingly.
*/
if (IS_ERR(priv->pinctrl) || IS_ERR(pin_state))
return ios->signal_voltage ==
MMC_SIGNAL_VOLTAGE_330 ? 0 : -EINVAL;
ret = mmc_regulator_set_vqmmc(host->mmc, ios);
if (ret)
return ret;
return pinctrl_select_state(priv->pinctrl, pin_state);
}
/* SCC registers */
#define SH_MOBILE_SDHI_SCC_DTCNTL 0x000
#define SH_MOBILE_SDHI_SCC_TAPSET 0x002
#define SH_MOBILE_SDHI_SCC_DT2FF 0x004
#define SH_MOBILE_SDHI_SCC_CKSEL 0x006
#define SH_MOBILE_SDHI_SCC_RVSCNTL 0x008
#define SH_MOBILE_SDHI_SCC_RVSREQ 0x00A
/* Definitions for values the SH_MOBILE_SDHI_SCC_DTCNTL register */
#define SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN BIT(0)
#define SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_SHIFT 16
#define SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_MASK 0xff
/* Definitions for values the SH_MOBILE_SDHI_SCC_CKSEL register */
#define SH_MOBILE_SDHI_SCC_CKSEL_DTSEL BIT(0)
/* Definitions for values the SH_MOBILE_SDHI_SCC_RVSCNTL register */
#define SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN BIT(0)
/* Definitions for values the SH_MOBILE_SDHI_SCC_RVSREQ register */
#define SH_MOBILE_SDHI_SCC_RVSREQ_RVSERR BIT(2)
static inline u32 sd_scc_read32(struct tmio_mmc_host *host,
struct renesas_sdhi *priv, int addr)
{
return readl(priv->scc_ctl + (addr << host->bus_shift));
}
static inline void sd_scc_write32(struct tmio_mmc_host *host,
struct renesas_sdhi *priv,
int addr, u32 val)
{
writel(val, priv->scc_ctl + (addr << host->bus_shift));
}
static unsigned int renesas_sdhi_init_tuning(struct tmio_mmc_host *host)
{
struct renesas_sdhi *priv;
priv = host_to_priv(host);
/* set sampling clock selection range */
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL,
0x8 << SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_SHIFT);
/* Initialize SCC */
sd_ctrl_write32_as_16_and_16(host, CTL_STATUS, 0x0);
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL,
SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN |
sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL));
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL,
SH_MOBILE_SDHI_SCC_CKSEL_DTSEL |
sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL));
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL,
~SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN &
sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL));
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DT2FF, priv->scc_tappos);
/* Read TAPNUM */
return (sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL) >>
SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_SHIFT) &
SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_MASK;
}
static void renesas_sdhi_prepare_tuning(struct tmio_mmc_host *host,
unsigned long tap)
{
struct renesas_sdhi *priv = host_to_priv(host);
/* Set sampling clock position */
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET, tap);
}
#define SH_MOBILE_SDHI_MAX_TAP 3
static int renesas_sdhi_select_tuning(struct tmio_mmc_host *host)
{
struct renesas_sdhi *priv = host_to_priv(host);
unsigned long tap_cnt; /* counter of tuning success */
unsigned long tap_set; /* tap position */
unsigned long tap_start;/* start position of tuning success */
unsigned long tap_end; /* end position of tuning success */
unsigned long ntap; /* temporary counter of tuning success */
unsigned long i;
/* Clear SCC_RVSREQ */
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ, 0);
/*
* Find the longest consecutive run of successful probes. If that
* is more than SH_MOBILE_SDHI_MAX_TAP probes long then use the
* center index as the tap.
*/
tap_cnt = 0;
ntap = 0;
tap_start = 0;
tap_end = 0;
for (i = 0; i < host->tap_num * 2; i++) {
if (test_bit(i, host->taps)) {
ntap++;
} else {
if (ntap > tap_cnt) {
tap_start = i - ntap;
tap_end = i - 1;
tap_cnt = ntap;
}
ntap = 0;
}
}
if (ntap > tap_cnt) {
tap_start = i - ntap;
tap_end = i - 1;
tap_cnt = ntap;
}
if (tap_cnt >= SH_MOBILE_SDHI_MAX_TAP)
tap_set = (tap_start + tap_end) / 2 % host->tap_num;
else
return -EIO;
/* Set SCC */
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET, tap_set);
/* Enable auto re-tuning */
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL,
SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN |
sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL));
return 0;
}
static bool renesas_sdhi_check_scc_error(struct tmio_mmc_host *host)
{
struct renesas_sdhi *priv = host_to_priv(host);
/* Check SCC error */
if (sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL) &
SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN &&
sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ) &
SH_MOBILE_SDHI_SCC_RVSREQ_RVSERR) {
/* Clear SCC error */
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ, 0);
return true;
}
return false;
}
static void renesas_sdhi_hw_reset(struct tmio_mmc_host *host)
{
struct renesas_sdhi *priv;
priv = host_to_priv(host);
/* Reset SCC */
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL,
~SH_MOBILE_SDHI_SCC_CKSEL_DTSEL &
sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_CKSEL));
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL,
~SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN &
sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL));
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL,
~SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN &
sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL));
}
static int renesas_sdhi_wait_idle(struct tmio_mmc_host *host, u32 bit)
{
int timeout = 1000;
/* CBSY is set when busy, SCLKDIVEN is cleared when busy */
u32 wait_state = (bit == TMIO_STAT_CMD_BUSY ? TMIO_STAT_CMD_BUSY : 0);
while (--timeout && (sd_ctrl_read16_and_16_as_32(host, CTL_STATUS)
& bit) == wait_state)
udelay(1);
if (!timeout) {
dev_warn(&host->pdev->dev, "timeout waiting for SD bus idle\n");
return -EBUSY;
}
return 0;
}
static int renesas_sdhi_write16_hook(struct tmio_mmc_host *host, int addr)
{
u32 bit = TMIO_STAT_SCLKDIVEN;
switch (addr) {
case CTL_SD_CMD:
case CTL_STOP_INTERNAL_ACTION:
case CTL_XFER_BLK_COUNT:
case CTL_SD_XFER_LEN:
case CTL_SD_MEM_CARD_OPT:
case CTL_TRANSACTION_CTL:
case CTL_DMA_ENABLE:
case EXT_ACC:
if (host->pdata->flags & TMIO_MMC_HAVE_CBSY)
bit = TMIO_STAT_CMD_BUSY;
/* fallthrough */
case CTL_SD_CARD_CLK_CTL:
return renesas_sdhi_wait_idle(host, bit);
}
return 0;
}
static int renesas_sdhi_multi_io_quirk(struct mmc_card *card,
unsigned int direction, int blk_size)
{
/*
* In Renesas controllers, when performing a
* multiple block read of one or two blocks,
* depending on the timing with which the
* response register is read, the response
* value may not be read properly.
* Use single block read for this HW bug
*/
if ((direction == MMC_DATA_READ) &&
blk_size == 2)
return 1;
return blk_size;
}
static void renesas_sdhi_enable_dma(struct tmio_mmc_host *host, bool enable)
{
/* Iff regs are 8 byte apart, sdbuf is 64 bit. Otherwise always 32. */
int width = (host->bus_shift == 2) ? 64 : 32;
sd_ctrl_write16(host, CTL_DMA_ENABLE, enable ? DMA_ENABLE_DMASDRW : 0);
renesas_sdhi_sdbuf_width(host, enable ? width : 16);
}
int renesas_sdhi_probe(struct platform_device *pdev,
const struct tmio_mmc_dma_ops *dma_ops)
{
struct tmio_mmc_data *mmd = pdev->dev.platform_data;
const struct renesas_sdhi_of_data *of_data;
struct tmio_mmc_data *mmc_data;
struct tmio_mmc_dma *dma_priv;
struct tmio_mmc_host *host;
struct renesas_sdhi *priv;
struct resource *res;
int irq, ret, i;
of_data = of_device_get_match_data(&pdev->dev);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -EINVAL;
priv = devm_kzalloc(&pdev->dev, sizeof(struct renesas_sdhi),
GFP_KERNEL);
if (!priv)
return -ENOMEM;
mmc_data = &priv->mmc_data;
dma_priv = &priv->dma_priv;
priv->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(priv->clk)) {
ret = PTR_ERR(priv->clk);
dev_err(&pdev->dev, "cannot get clock: %d\n", ret);
return ret;
}
/*
* Some controllers provide a 2nd clock just to run the internal card
* detection logic. Unfortunately, the existing driver architecture does
* not support a separation of clocks for runtime PM usage. When
* native hotplug is used, the tmio driver assumes that the core
* must continue to run for card detect to stay active, so we cannot
* disable it.
* Additionally, it is prohibited to supply a clock to the core but not
* to the card detect circuit. That leaves us with if separate clocks
* are presented, we must treat them both as virtually 1 clock.
*/
priv->clk_cd = devm_clk_get(&pdev->dev, "cd");
if (IS_ERR(priv->clk_cd))
priv->clk_cd = NULL;
priv->pinctrl = devm_pinctrl_get(&pdev->dev);
if (!IS_ERR(priv->pinctrl)) {
priv->pins_default = pinctrl_lookup_state(priv->pinctrl,
PINCTRL_STATE_DEFAULT);
priv->pins_uhs = pinctrl_lookup_state(priv->pinctrl,
"state_uhs");
}
host = tmio_mmc_host_alloc(pdev, mmc_data);
if (IS_ERR(host))
return PTR_ERR(host);
if (of_data) {
mmc_data->flags |= of_data->tmio_flags;
mmc_data->ocr_mask = of_data->tmio_ocr_mask;
mmc_data->capabilities |= of_data->capabilities;
mmc_data->capabilities2 |= of_data->capabilities2;
mmc_data->dma_rx_offset = of_data->dma_rx_offset;
mmc_data->max_blk_count = of_data->max_blk_count;
mmc_data->max_segs = of_data->max_segs;
dma_priv->dma_buswidth = of_data->dma_buswidth;
host->bus_shift = of_data->bus_shift;
}
host->write16_hook = renesas_sdhi_write16_hook;
host->clk_enable = renesas_sdhi_clk_enable;
host->clk_update = renesas_sdhi_clk_update;
host->clk_disable = renesas_sdhi_clk_disable;
host->multi_io_quirk = renesas_sdhi_multi_io_quirk;
host->dma_ops = dma_ops;
/* SDR speeds are only available on Gen2+ */
if (mmc_data->flags & TMIO_MMC_MIN_RCAR2) {
/* card_busy caused issues on r8a73a4 (pre-Gen2) CD-less SDHI */
host->ops.card_busy = renesas_sdhi_card_busy;
host->ops.start_signal_voltage_switch =
renesas_sdhi_start_signal_voltage_switch;
}
/* Orginally registers were 16 bit apart, could be 32 or 64 nowadays */
if (!host->bus_shift && resource_size(res) > 0x100) /* old way to determine the shift */
host->bus_shift = 1;
if (mmd)
*mmc_data = *mmd;
dma_priv->filter = shdma_chan_filter;
dma_priv->enable = renesas_sdhi_enable_dma;
mmc_data->alignment_shift = 1; /* 2-byte alignment */
mmc_data->capabilities |= MMC_CAP_MMC_HIGHSPEED;
/*
* All SDHI blocks support 2-byte and larger block sizes in 4-bit
* bus width mode.
*/
mmc_data->flags |= TMIO_MMC_BLKSZ_2BYTES;
/*
* All SDHI blocks support SDIO IRQ signalling.
*/
mmc_data->flags |= TMIO_MMC_SDIO_IRQ;
/* All SDHI have CMD12 control bit */
mmc_data->flags |= TMIO_MMC_HAVE_CMD12_CTRL;
/* All SDHI have SDIO status bits which must be 1 */
mmc_data->flags |= TMIO_MMC_SDIO_STATUS_SETBITS;
ret = renesas_sdhi_clk_enable(host);
if (ret)
goto efree;
ret = tmio_mmc_host_probe(host);
if (ret < 0)
goto edisclk;
/* One Gen2 SDHI incarnation does NOT have a CBSY bit */
if (sd_ctrl_read16(host, CTL_VERSION) == SDHI_VER_GEN2_SDR50)
mmc_data->flags &= ~TMIO_MMC_HAVE_CBSY;
/* Enable tuning iff we have an SCC and a supported mode */
if (of_data && of_data->scc_offset &&
(host->mmc->caps & MMC_CAP_UHS_SDR104 ||
host->mmc->caps2 & MMC_CAP2_HS200_1_8V_SDR)) {
const struct renesas_sdhi_scc *taps = of_data->taps;
bool hit = false;
host->mmc->caps |= MMC_CAP_HW_RESET;
for (i = 0; i < of_data->taps_num; i++) {
if (taps[i].clk_rate == 0 ||
taps[i].clk_rate == host->mmc->f_max) {
priv->scc_tappos = taps->tap;
hit = true;
break;
}
}
if (!hit)
dev_warn(&host->pdev->dev, "Unknown clock rate for SDR104\n");
priv->scc_ctl = host->ctl + of_data->scc_offset;
host->init_tuning = renesas_sdhi_init_tuning;
host->prepare_tuning = renesas_sdhi_prepare_tuning;
host->select_tuning = renesas_sdhi_select_tuning;
host->check_scc_error = renesas_sdhi_check_scc_error;
host->hw_reset = renesas_sdhi_hw_reset;
}
i = 0;
while (1) {
irq = platform_get_irq(pdev, i);
if (irq < 0)
break;
i++;
ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq, 0,
dev_name(&pdev->dev), host);
if (ret)
goto eirq;
}
/* There must be at least one IRQ source */
if (!i) {
ret = irq;
goto eirq;
}
dev_info(&pdev->dev, "%s base at 0x%08lx max clock rate %u MHz\n",
mmc_hostname(host->mmc), (unsigned long)
(platform_get_resource(pdev, IORESOURCE_MEM, 0)->start),
host->mmc->f_max / 1000000);
return ret;
eirq:
tmio_mmc_host_remove(host);
edisclk:
renesas_sdhi_clk_disable(host);
efree:
tmio_mmc_host_free(host);
return ret;
}
EXPORT_SYMBOL_GPL(renesas_sdhi_probe);
int renesas_sdhi_remove(struct platform_device *pdev)
{
struct tmio_mmc_host *host = platform_get_drvdata(pdev);
tmio_mmc_host_remove(host);
renesas_sdhi_clk_disable(host);
return 0;
}
EXPORT_SYMBOL_GPL(renesas_sdhi_remove);
MODULE_LICENSE("GPL v2");
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