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linux-zen-server/drivers/mmc/host/renesas_sdhi_core.c

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// SPDX-License-Identifier: GPL-2.0
/*
* Renesas SDHI
*
* Copyright (C) 2015-19 Renesas Electronics Corporation
* Copyright (C) 2016-19 Sang Engineering, Wolfram Sang
* Copyright (C) 2016-17 Horms Solutions, Simon Horman
* Copyright (C) 2009 Magnus Damm
*
* 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/clk.h>
#include <linux/delay.h>
#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/mfd/tmio.h>
#include <linux/mmc/host.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/slot-gpio.h>
#include <linux/module.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/pinctrl-state.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/regulator/consumer.h>
#include <linux/reset.h>
#include <linux/sh_dma.h>
#include <linux/slab.h>
#include "renesas_sdhi.h"
#include "tmio_mmc.h"
#define CTL_HOST_MODE 0xe4
#define HOST_MODE_GEN2_SDR50_WMODE BIT(0)
#define HOST_MODE_GEN2_SDR104_WMODE BIT(0)
#define HOST_MODE_GEN3_WMODE BIT(0)
#define HOST_MODE_GEN3_BUSWIDTH BIT(8)
#define HOST_MODE_GEN3_16BIT HOST_MODE_GEN3_WMODE
#define HOST_MODE_GEN3_32BIT (HOST_MODE_GEN3_WMODE | HOST_MODE_GEN3_BUSWIDTH)
#define HOST_MODE_GEN3_64BIT 0
#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
#define SDHI_GEN3_MMC0_ADDR 0xee140000
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) ? HOST_MODE_GEN2_SDR50_WMODE : 0;
break;
case SDHI_VER_GEN2_SDR104:
val = (width == 32) ? 0 : HOST_MODE_GEN2_SDR104_WMODE;
break;
case SDHI_VER_GEN3_SD:
case SDHI_VER_GEN3_SDMMC:
if (width == 64)
val = HOST_MODE_GEN3_64BIT;
else if (width == 32)
val = HOST_MODE_GEN3_32BIT;
else
val = HOST_MODE_GEN3_16BIT;
break;
default:
/* nothing to do */
return;
}
sd_ctrl_write16(host, CTL_HOST_MODE, 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;
ret = clk_prepare_enable(priv->clk_cd);
if (ret < 0)
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 wanted_clock)
{
struct renesas_sdhi *priv = host_to_priv(host);
struct clk *ref_clk = priv->clk;
unsigned int freq, diff, best_freq = 0, diff_min = ~0;
unsigned int new_clock, clkh_shift = 0;
unsigned int new_upper_limit;
int i;
/*
* We simply return the current rate if a) we are not on a R-Car Gen2+
* SoC (may work for others, but untested) or b) if the SCC needs its
* clock during tuning, so we don't change the external clock setup.
*/
if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2) || mmc_doing_tune(host->mmc))
return clk_get_rate(priv->clk);
if (priv->clkh) {
/* HS400 with 4TAP needs different clock settings */
bool use_4tap = sdhi_has_quirk(priv, hs400_4taps);
bool need_slow_clkh = host->mmc->ios.timing == MMC_TIMING_MMC_HS400;
clkh_shift = use_4tap && need_slow_clkh ? 1 : 2;
ref_clk = priv->clkh;
}
new_clock = wanted_clock << clkh_shift;
/*
* 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.
*
* Add an upper limit of 1/1024 rate higher to the clock rate to fix
* clk rate jumping to lower rate due to rounding error (eg: RZ/G2L has
* 3 clk sources 533.333333 MHz, 400 MHz and 266.666666 MHz. The request
* for 533.333333 MHz will selects a slower 400 MHz due to rounding
* error (533333333 Hz / 4 * 4 = 533333332 Hz < 533333333 Hz)).
*/
for (i = min(9, ilog2(UINT_MAX / new_clock)); i >= 0; i--) {
freq = clk_round_rate(ref_clk, new_clock << i);
new_upper_limit = (new_clock << i) + ((new_clock << i) >> 10);
if (freq > new_upper_limit) {
/* Too fast; look for a slightly slower option */
freq = clk_round_rate(ref_clk, (new_clock << i) / 4 * 3);
if (freq > new_upper_limit)
continue;
}
diff = new_clock - (freq >> i);
if (diff <= diff_min) {
best_freq = freq;
diff_min = diff;
}
}
clk_set_rate(ref_clk, best_freq);
if (priv->clkh)
clk_set_rate(priv->clk, best_freq >> clkh_shift);
return clk_get_rate(priv->clk);
}
static void renesas_sdhi_set_clock(struct tmio_mmc_host *host,
unsigned int new_clock)
{
unsigned int clk_margin;
u32 clk = 0, clock;
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
if (new_clock == 0) {
host->mmc->actual_clock = 0;
goto out;
}
host->mmc->actual_clock = renesas_sdhi_clk_update(host, new_clock);
clock = host->mmc->actual_clock / 512;
/*
* Add a margin of 1/1024 rate higher to the clock rate in order
* to avoid clk variable setting a value of 0 due to the margin
* provided for actual_clock in renesas_sdhi_clk_update().
*/
clk_margin = new_clock >> 10;
for (clk = 0x80000080; new_clock + clk_margin >= (clock << 1); clk >>= 1)
clock <<= 1;
/* 1/1 clock is option */
if ((host->pdata->flags & TMIO_MMC_CLK_ACTUAL) && ((clk >> 22) & 0x1)) {
if (!(host->mmc->ios.timing == MMC_TIMING_MMC_HS400))
clk |= 0xff;
else
clk &= ~0xff;
}
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, clk & CLK_CTL_DIV_MASK);
if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2))
usleep_range(10000, 11000);
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
out:
/* HW engineers overrode docs: no sleep needed on R-Car2+ */
if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2))
usleep_range(10000, 11000);
}
static void renesas_sdhi_clk_disable(struct tmio_mmc_host *host)
{
struct renesas_sdhi *priv = host_to_priv(host);
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 < 0)
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
#define SH_MOBILE_SDHI_SCC_SMPCMP 0x00C
#define SH_MOBILE_SDHI_SCC_TMPPORT2 0x00E
#define SH_MOBILE_SDHI_SCC_TMPPORT3 0x014
#define SH_MOBILE_SDHI_SCC_TMPPORT4 0x016
#define SH_MOBILE_SDHI_SCC_TMPPORT5 0x018
#define SH_MOBILE_SDHI_SCC_TMPPORT6 0x01A
#define SH_MOBILE_SDHI_SCC_TMPPORT7 0x01C
#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
#define SH_MOBILE_SDHI_SCC_CKSEL_DTSEL BIT(0)
#define SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN BIT(0)
#define SH_MOBILE_SDHI_SCC_RVSREQ_REQTAPDOWN BIT(0)
#define SH_MOBILE_SDHI_SCC_RVSREQ_REQTAPUP BIT(1)
#define SH_MOBILE_SDHI_SCC_RVSREQ_RVSERR BIT(2)
#define SH_MOBILE_SDHI_SCC_SMPCMP_CMD_REQDOWN BIT(8)
#define SH_MOBILE_SDHI_SCC_SMPCMP_CMD_REQUP BIT(24)
#define SH_MOBILE_SDHI_SCC_SMPCMP_CMD_ERR (BIT(8) | BIT(24))
#define SH_MOBILE_SDHI_SCC_TMPPORT2_HS400OSEL BIT(4)
#define SH_MOBILE_SDHI_SCC_TMPPORT2_HS400EN BIT(31)
/* Definitions for values the SH_MOBILE_SDHI_SCC_TMPPORT4 register */
#define SH_MOBILE_SDHI_SCC_TMPPORT4_DLL_ACC_START BIT(0)
/* Definitions for values the SH_MOBILE_SDHI_SCC_TMPPORT5 register */
#define SH_MOBILE_SDHI_SCC_TMPPORT5_DLL_RW_SEL_R BIT(8)
#define SH_MOBILE_SDHI_SCC_TMPPORT5_DLL_RW_SEL_W (0 << 8)
#define SH_MOBILE_SDHI_SCC_TMPPORT5_DLL_ADR_MASK 0x3F
/* Definitions for values the SH_MOBILE_SDHI_SCC register */
#define SH_MOBILE_SDHI_SCC_TMPPORT_DISABLE_WP_CODE 0xa5000000
#define SH_MOBILE_SDHI_SCC_TMPPORT_CALIB_CODE_MASK 0x1f
#define SH_MOBILE_SDHI_SCC_TMPPORT_MANUAL_MODE BIT(7)
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);
/* Initialize SCC */
sd_ctrl_write32_as_16_and_16(host, CTL_STATUS, 0x0);
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
/* set sampling clock selection range */
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DTCNTL,
SH_MOBILE_SDHI_SCC_DTCNTL_TAPEN |
0x8 << SH_MOBILE_SDHI_SCC_DTCNTL_TAPNUM_SHIFT);
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_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);
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
/* 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_hs400_complete(struct mmc_host *mmc)
{
struct tmio_mmc_host *host = mmc_priv(mmc);
struct renesas_sdhi *priv = host_to_priv(host);
u32 bad_taps = priv->quirks ? priv->quirks->hs400_bad_taps : 0;
bool use_4tap = sdhi_has_quirk(priv, hs400_4taps);
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
/* Set HS400 mode */
sd_ctrl_write16(host, CTL_SDIF_MODE, SDIF_MODE_HS400 |
sd_ctrl_read16(host, CTL_SDIF_MODE));
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DT2FF,
priv->scc_tappos_hs400);
if (sdhi_has_quirk(priv, manual_tap_correction))
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_TMPPORT2,
(SH_MOBILE_SDHI_SCC_TMPPORT2_HS400EN |
SH_MOBILE_SDHI_SCC_TMPPORT2_HS400OSEL) |
sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2));
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));
/* Avoid bad TAP */
if (bad_taps & BIT(priv->tap_set)) {
u32 new_tap = (priv->tap_set + 1) % priv->tap_num;
if (bad_taps & BIT(new_tap))
new_tap = (priv->tap_set - 1) % priv->tap_num;
if (bad_taps & BIT(new_tap)) {
new_tap = priv->tap_set;
dev_dbg(&host->pdev->dev, "Can't handle three bad tap in a row\n");
}
priv->tap_set = new_tap;
}
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET,
priv->tap_set / (use_4tap ? 2 : 1));
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));
if (priv->adjust_hs400_calib_table)
priv->needs_adjust_hs400 = true;
}
static void renesas_sdhi_disable_scc(struct mmc_host *mmc)
{
struct tmio_mmc_host *host = mmc_priv(mmc);
struct renesas_sdhi *priv = host_to_priv(host);
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_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));
}
static u32 sd_scc_tmpport_read32(struct tmio_mmc_host *host,
struct renesas_sdhi *priv, u32 addr)
{
/* read mode */
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT5,
SH_MOBILE_SDHI_SCC_TMPPORT5_DLL_RW_SEL_R |
(SH_MOBILE_SDHI_SCC_TMPPORT5_DLL_ADR_MASK & addr));
/* access start and stop */
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT4,
SH_MOBILE_SDHI_SCC_TMPPORT4_DLL_ACC_START);
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT4, 0);
return sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT7);
}
static void sd_scc_tmpport_write32(struct tmio_mmc_host *host,
struct renesas_sdhi *priv, u32 addr, u32 val)
{
/* write mode */
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT5,
SH_MOBILE_SDHI_SCC_TMPPORT5_DLL_RW_SEL_W |
(SH_MOBILE_SDHI_SCC_TMPPORT5_DLL_ADR_MASK & addr));
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT6, val);
/* access start and stop */
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT4,
SH_MOBILE_SDHI_SCC_TMPPORT4_DLL_ACC_START);
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT4, 0);
}
static void renesas_sdhi_adjust_hs400_mode_enable(struct tmio_mmc_host *host)
{
struct renesas_sdhi *priv = host_to_priv(host);
u32 calib_code;
/* disable write protect */
sd_scc_tmpport_write32(host, priv, 0x00,
SH_MOBILE_SDHI_SCC_TMPPORT_DISABLE_WP_CODE);
/* read calibration code and adjust */
calib_code = sd_scc_tmpport_read32(host, priv, 0x26);
calib_code &= SH_MOBILE_SDHI_SCC_TMPPORT_CALIB_CODE_MASK;
sd_scc_tmpport_write32(host, priv, 0x22,
SH_MOBILE_SDHI_SCC_TMPPORT_MANUAL_MODE |
priv->adjust_hs400_calib_table[calib_code]);
/* set offset value to TMPPORT3, hardcoded to OFFSET0 (= 0x3) for now */
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT3, 0x3);
/* adjustment done, clear flag */
priv->needs_adjust_hs400 = false;
}
static void renesas_sdhi_adjust_hs400_mode_disable(struct tmio_mmc_host *host)
{
struct renesas_sdhi *priv = host_to_priv(host);
/* disable write protect */
sd_scc_tmpport_write32(host, priv, 0x00,
SH_MOBILE_SDHI_SCC_TMPPORT_DISABLE_WP_CODE);
/* disable manual calibration */
sd_scc_tmpport_write32(host, priv, 0x22, 0);
/* clear offset value of TMPPORT3 */
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT3, 0);
}
static void renesas_sdhi_reset_hs400_mode(struct tmio_mmc_host *host,
struct renesas_sdhi *priv)
{
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
/* Reset HS400 mode */
sd_ctrl_write16(host, CTL_SDIF_MODE, ~SDIF_MODE_HS400 &
sd_ctrl_read16(host, CTL_SDIF_MODE));
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_DT2FF, priv->scc_tappos);
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2,
~(SH_MOBILE_SDHI_SCC_TMPPORT2_HS400EN |
SH_MOBILE_SDHI_SCC_TMPPORT2_HS400OSEL) &
sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_TMPPORT2));
if (sdhi_has_quirk(priv, hs400_calib_table) || sdhi_has_quirk(priv, hs400_bad_taps))
renesas_sdhi_adjust_hs400_mode_disable(host);
sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
}
static int renesas_sdhi_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios)
{
struct tmio_mmc_host *host = mmc_priv(mmc);
renesas_sdhi_reset_hs400_mode(host, host_to_priv(host));
return 0;
}
static void renesas_sdhi_scc_reset(struct tmio_mmc_host *host, struct renesas_sdhi *priv)
{
renesas_sdhi_disable_scc(host->mmc);
renesas_sdhi_reset_hs400_mode(host, priv);
priv->needs_adjust_hs400 = false;
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));
}
/* only populated for TMIO_MMC_MIN_RCAR2 */
static void renesas_sdhi_reset(struct tmio_mmc_host *host, bool preserve)
{
struct renesas_sdhi *priv = host_to_priv(host);
int ret;
u16 val;
if (!preserve) {
if (priv->rstc) {
reset_control_reset(priv->rstc);
/* Unknown why but without polling reset status, it will hang */
read_poll_timeout(reset_control_status, ret, ret == 0, 1, 100,
false, priv->rstc);
/* At least SDHI_VER_GEN2_SDR50 needs manual release of reset */
sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
priv->needs_adjust_hs400 = false;
renesas_sdhi_set_clock(host, host->clk_cache);
} else if (priv->scc_ctl) {
renesas_sdhi_scc_reset(host, priv);
}
}
if (sd_ctrl_read16(host, CTL_VERSION) >= SDHI_VER_GEN3_SD) {
val = sd_ctrl_read16(host, CTL_SD_MEM_CARD_OPT);
val |= CARD_OPT_EXTOP;
sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, val);
}
}
static unsigned int renesas_sdhi_gen3_get_cycles(struct tmio_mmc_host *host)
{
u16 num, val = sd_ctrl_read16(host, CTL_SD_MEM_CARD_OPT);
num = (val & CARD_OPT_TOP_MASK) >> CARD_OPT_TOP_SHIFT;
return 1 << ((val & CARD_OPT_EXTOP ? 14 : 13) + num);
}
#define SH_MOBILE_SDHI_MIN_TAP_ROW 3
static int renesas_sdhi_select_tuning(struct tmio_mmc_host *host)
{
struct renesas_sdhi *priv = host_to_priv(host);
unsigned int tap_start = 0, tap_end = 0, tap_cnt = 0, rs, re, i;
unsigned int taps_size = priv->tap_num * 2, min_tap_row;
unsigned long *bitmap;
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ, 0);
/*
* When tuning CMD19 is issued twice for each tap, merge the
* result requiring the tap to be good in both runs before
* considering it for tuning selection.
*/
for (i = 0; i < taps_size; i++) {
int offset = priv->tap_num * (i < priv->tap_num ? 1 : -1);
if (!test_bit(i, priv->taps))
clear_bit(i + offset, priv->taps);
if (!test_bit(i, priv->smpcmp))
clear_bit(i + offset, priv->smpcmp);
}
/*
* If all TAP are OK, the sampling clock position is selected by
* identifying the change point of data.
*/
if (bitmap_full(priv->taps, taps_size)) {
bitmap = priv->smpcmp;
min_tap_row = 1;
} else {
bitmap = priv->taps;
min_tap_row = SH_MOBILE_SDHI_MIN_TAP_ROW;
}
/*
* Find the longest consecutive run of successful probes. If that
* is at least SH_MOBILE_SDHI_MIN_TAP_ROW probes long then use the
* center index as the tap, otherwise bail out.
*/
for_each_set_bitrange(rs, re, bitmap, taps_size) {
if (re - rs > tap_cnt) {
tap_end = re;
tap_start = rs;
tap_cnt = tap_end - tap_start;
}
}
if (tap_cnt >= min_tap_row)
priv->tap_set = (tap_start + tap_end) / 2 % priv->tap_num;
else
return -EIO;
/* Set SCC */
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET, priv->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 int renesas_sdhi_execute_tuning(struct mmc_host *mmc, u32 opcode)
{
struct tmio_mmc_host *host = mmc_priv(mmc);
struct renesas_sdhi *priv = host_to_priv(host);
int i, ret;
priv->tap_num = renesas_sdhi_init_tuning(host);
if (!priv->tap_num)
return 0; /* Tuning is not supported */
if (priv->tap_num * 2 >= sizeof(priv->taps) * BITS_PER_BYTE) {
dev_err(&host->pdev->dev,
"Too many taps, please update 'taps' in tmio_mmc_host!\n");
return -EINVAL;
}
bitmap_zero(priv->taps, priv->tap_num * 2);
bitmap_zero(priv->smpcmp, priv->tap_num * 2);
/* Issue CMD19 twice for each tap */
for (i = 0; i < 2 * priv->tap_num; i++) {
int cmd_error = 0;
/* Set sampling clock position */
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET, i % priv->tap_num);
if (mmc_send_tuning(mmc, opcode, &cmd_error) == 0)
set_bit(i, priv->taps);
if (sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_SMPCMP) == 0)
set_bit(i, priv->smpcmp);
if (cmd_error)
mmc_send_abort_tuning(mmc, opcode);
}
ret = renesas_sdhi_select_tuning(host);
if (ret < 0)
renesas_sdhi_scc_reset(host, priv);
return ret;
}
static bool renesas_sdhi_manual_correction(struct tmio_mmc_host *host, bool use_4tap)
{
struct renesas_sdhi *priv = host_to_priv(host);
unsigned int new_tap = priv->tap_set, error_tap = priv->tap_set;
u32 val;
val = sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ);
if (!val)
return false;
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ, 0);
/* Change TAP position according to correction status */
if (sdhi_has_quirk(priv, manual_tap_correction) &&
host->mmc->ios.timing == MMC_TIMING_MMC_HS400) {
u32 bad_taps = priv->quirks ? priv->quirks->hs400_bad_taps : 0;
/*
* With HS400, the DAT signal is based on DS, not CLK.
* Therefore, use only CMD status.
*/
u32 smpcmp = sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_SMPCMP) &
SH_MOBILE_SDHI_SCC_SMPCMP_CMD_ERR;
if (!smpcmp) {
return false; /* no error in CMD signal */
} else if (smpcmp == SH_MOBILE_SDHI_SCC_SMPCMP_CMD_REQUP) {
new_tap++;
error_tap--;
} else if (smpcmp == SH_MOBILE_SDHI_SCC_SMPCMP_CMD_REQDOWN) {
new_tap--;
error_tap++;
} else {
return true; /* need retune */
}
/*
* When new_tap is a bad tap, we cannot change. Then, we compare
* with the HS200 tuning result. When smpcmp[error_tap] is OK,
* we can at least retune.
*/
if (bad_taps & BIT(new_tap % priv->tap_num))
return test_bit(error_tap % priv->tap_num, priv->smpcmp);
} else {
if (val & SH_MOBILE_SDHI_SCC_RVSREQ_RVSERR)
return true; /* need retune */
else if (val & SH_MOBILE_SDHI_SCC_RVSREQ_REQTAPUP)
new_tap++;
else if (val & SH_MOBILE_SDHI_SCC_RVSREQ_REQTAPDOWN)
new_tap--;
else
return false;
}
priv->tap_set = (new_tap % priv->tap_num);
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_TAPSET,
priv->tap_set / (use_4tap ? 2 : 1));
return false;
}
static bool renesas_sdhi_auto_correction(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_RVSREQ) &
SH_MOBILE_SDHI_SCC_RVSREQ_RVSERR) {
sd_scc_write32(host, priv, SH_MOBILE_SDHI_SCC_RVSREQ, 0);
return true;
}
return false;
}
static bool renesas_sdhi_check_scc_error(struct tmio_mmc_host *host,
struct mmc_request *mrq)
{
struct renesas_sdhi *priv = host_to_priv(host);
bool use_4tap = sdhi_has_quirk(priv, hs400_4taps);
bool ret = false;
/*
* Skip checking SCC errors when running on 4 taps in HS400 mode as
* any retuning would still result in the same 4 taps being used.
*/
if (!(host->mmc->ios.timing == MMC_TIMING_UHS_SDR104) &&
!(host->mmc->ios.timing == MMC_TIMING_MMC_HS200) &&
!(host->mmc->ios.timing == MMC_TIMING_MMC_HS400 && !use_4tap))
return false;
if (mmc_doing_tune(host->mmc))
return false;
if (((mrq->cmd->error == -ETIMEDOUT) ||
(mrq->data && mrq->data->error == -ETIMEDOUT)) &&
((host->mmc->caps & MMC_CAP_NONREMOVABLE) ||
(host->ops.get_cd && host->ops.get_cd(host->mmc))))
ret |= true;
if (sd_scc_read32(host, priv, SH_MOBILE_SDHI_SCC_RVSCNTL) &
SH_MOBILE_SDHI_SCC_RVSCNTL_RVSEN)
ret |= renesas_sdhi_auto_correction(host);
else
ret |= renesas_sdhi_manual_correction(host, use_4tap);
return ret;
}
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 CTL_HOST_MODE:
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_fixup_request(struct tmio_mmc_host *host, struct mmc_request *mrq)
{
struct renesas_sdhi *priv = host_to_priv(host);
if (priv->needs_adjust_hs400 && mrq->cmd->opcode == MMC_SEND_STATUS)
renesas_sdhi_adjust_hs400_mode_enable(host);
}
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,
const struct renesas_sdhi_of_data *of_data,
const struct renesas_sdhi_quirks *quirks)
{
struct tmio_mmc_data *mmd = pdev->dev.platform_data;
struct tmio_mmc_data *mmc_data;
struct renesas_sdhi_dma *dma_priv;
struct tmio_mmc_host *host;
struct renesas_sdhi *priv;
int num_irqs, irq, ret, i;
struct resource *res;
u16 ver;
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;
priv->quirks = quirks;
mmc_data = &priv->mmc_data;
dma_priv = &priv->dma_priv;
priv->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(priv->clk))
return dev_err_probe(&pdev->dev, PTR_ERR(priv->clk), "cannot get clock");
priv->clkh = devm_clk_get_optional(&pdev->dev, "clkh");
if (IS_ERR(priv->clkh))
return dev_err_probe(&pdev->dev, PTR_ERR(priv->clkh), "cannot get clkh");
/*
* 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_optional(&pdev->dev, "cd");
if (IS_ERR(priv->clk_cd))
return dev_err_probe(&pdev->dev, PTR_ERR(priv->clk_cd), "cannot get cd clock");
priv->rstc = devm_reset_control_get_optional_exclusive(&pdev->dev, NULL);
if (IS_ERR(priv->rstc))
return PTR_ERR(priv->rstc);
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;
/* Fallback for old DTs */
if (!priv->clkh && of_data->sdhi_flags & SDHI_FLAG_NEED_CLKH_FALLBACK)
priv->clkh = clk_get_parent(clk_get_parent(priv->clk));
}
host->write16_hook = renesas_sdhi_write16_hook;
host->clk_enable = renesas_sdhi_clk_enable;
host->clk_disable = renesas_sdhi_clk_disable;
host->set_clock = renesas_sdhi_set_clock;
host->multi_io_quirk = renesas_sdhi_multi_io_quirk;
host->dma_ops = dma_ops;
if (sdhi_has_quirk(priv, hs400_disabled))
host->mmc->caps2 &= ~(MMC_CAP2_HS400 | MMC_CAP2_HS400_ES);
/* For some SoC, we disable internal WP. GPIO may override this */
if (mmc_can_gpio_ro(host->mmc))
mmc_data->capabilities2 &= ~MMC_CAP2_NO_WRITE_PROTECT;
/* 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;
host->sdcard_irq_setbit_mask = TMIO_STAT_ALWAYS_SET_27;
host->sdcard_irq_mask_all = TMIO_MASK_ALL_RCAR2;
host->reset = renesas_sdhi_reset;
}
/* 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->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;
/* All SDHI support HW busy detection */
mmc_data->flags |= TMIO_MMC_USE_BUSY_TIMEOUT;
dev_pm_domain_start(&pdev->dev);
ret = renesas_sdhi_clk_enable(host);
if (ret)
goto efree;
ver = sd_ctrl_read16(host, CTL_VERSION);
/* GEN2_SDR104 is first known SDHI to use 32bit block count */
if (ver < SDHI_VER_GEN2_SDR104 && mmc_data->max_blk_count > U16_MAX)
mmc_data->max_blk_count = U16_MAX;
/* One Gen2 SDHI incarnation does NOT have a CBSY bit */
if (ver == SDHI_VER_GEN2_SDR50)
mmc_data->flags &= ~TMIO_MMC_HAVE_CBSY;
if (ver == SDHI_VER_GEN3_SDMMC && sdhi_has_quirk(priv, hs400_calib_table)) {
host->fixup_request = renesas_sdhi_fixup_request;
priv->adjust_hs400_calib_table = *(
res->start == SDHI_GEN3_MMC0_ADDR ?
quirks->hs400_calib_table :
quirks->hs400_calib_table + 1);
}
/* these have an EXTOP bit */
if (ver >= SDHI_VER_GEN3_SD)
host->get_timeout_cycles = renesas_sdhi_gen3_get_cycles;
/* Check for SCC so we can reset it if needed */
if (of_data && of_data->scc_offset && ver >= SDHI_VER_GEN2_SDR104)
priv->scc_ctl = host->ctl + of_data->scc_offset;
/* Enable tuning iff we have an SCC and a supported mode */
if (priv->scc_ctl && (host->mmc->caps & MMC_CAP_UHS_SDR104 ||
host->mmc->caps2 & MMC_CAP2_HSX00_1_8V)) {
const struct renesas_sdhi_scc *taps = of_data->taps;
bool use_4tap = sdhi_has_quirk(priv, hs400_4taps);
bool hit = false;
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;
priv->scc_tappos_hs400 = use_4tap ?
taps->tap_hs400_4tap :
taps->tap;
hit = true;
break;
}
}
if (!hit)
dev_warn(&host->pdev->dev, "Unknown clock rate for tuning\n");
host->check_retune = renesas_sdhi_check_scc_error;
host->ops.execute_tuning = renesas_sdhi_execute_tuning;
host->ops.prepare_hs400_tuning = renesas_sdhi_prepare_hs400_tuning;
host->ops.hs400_downgrade = renesas_sdhi_disable_scc;
host->ops.hs400_complete = renesas_sdhi_hs400_complete;
}
ret = tmio_mmc_host_probe(host);
if (ret < 0)
goto edisclk;
num_irqs = platform_irq_count(pdev);
if (num_irqs < 0) {
ret = num_irqs;
goto eirq;
}
/* There must be at least one IRQ source */
if (!num_irqs) {
ret = -ENXIO;
goto eirq;
}
for (i = 0; i < num_irqs; i++) {
irq = platform_get_irq(pdev, i);
if (irq < 0) {
ret = irq;
goto eirq;
}
ret = devm_request_irq(&pdev->dev, irq, tmio_mmc_irq, 0,
dev_name(&pdev->dev), host);
if (ret)
goto eirq;
}
dev_info(&pdev->dev, "%s base at %pa, max clock rate %u MHz\n",
mmc_hostname(host->mmc), &res->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);
tmio_mmc_host_free(host);
return 0;
}
EXPORT_SYMBOL_GPL(renesas_sdhi_remove);
MODULE_LICENSE("GPL v2");
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