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Message-ID: <20230619115120.64474-6-yann.gautier@foss.st.com>
Date: Mon, 19 Jun 2023 13:51:19 +0200
From: Yann Gautier <yann.gautier@...s.st.com>
To: Ulf Hansson <ulf.hansson@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
<linux-mmc@...r.kernel.org>, <devicetree@...r.kernel.org>
CC: Conor Dooley <conor+dt@...nel.org>,
Russell King <linux@...linux.org.uk>,
Philipp Zabel <p.zabel@...gutronix.de>,
Christophe Kerello <christophe.kerello@...s.st.com>,
<linux-kernel@...r.kernel.org>, Marek Vasut <marex@...x.de>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Linus Walleij <linus.walleij@...aro.org>,
Yang Yingliang <yangyingliang@...wei.com>,
Xiang wangx <wangxiang@...rlc.com>,
<linux-stm32@...md-mailman.stormreply.com>,
<linux-arm-kernel@...ts.infradead.org>,
Yann Gautier <yann.gautier@...s.st.com>
Subject: [PATCH v2 5/6] mmc: mmci: stm32: prepare other delay block support
Create an sdmmc_tuning_ops struct to ease support for another
delay block peripheral.
Signed-off-by: Yann Gautier <yann.gautier@...s.st.com>
---
drivers/mmc/host/mmci_stm32_sdmmc.c | 68 +++++++++++++++++++++++------
1 file changed, 55 insertions(+), 13 deletions(-)
diff --git a/drivers/mmc/host/mmci_stm32_sdmmc.c b/drivers/mmc/host/mmci_stm32_sdmmc.c
index 0dc1ae674f44c..c51c85ca24917 100644
--- a/drivers/mmc/host/mmci_stm32_sdmmc.c
+++ b/drivers/mmc/host/mmci_stm32_sdmmc.c
@@ -47,10 +47,21 @@ struct sdmmc_idma {
bool use_bounce_buffer;
};
+struct sdmmc_dlyb;
+
+struct sdmmc_tuning_ops {
+ int (*dlyb_enable)(struct sdmmc_dlyb *dlyb);
+ void (*set_input_ck)(struct sdmmc_dlyb *dlyb);
+ int (*tuning_prepare)(struct mmci_host *host);
+ int (*set_cfg)(struct sdmmc_dlyb *dlyb, int unit __maybe_unused,
+ int phase, bool sampler __maybe_unused);
+};
+
struct sdmmc_dlyb {
void __iomem *base;
u32 unit;
u32 max;
+ struct sdmmc_tuning_ops *ops;
};
static int sdmmc_idma_validate_data(struct mmci_host *host,
@@ -299,7 +310,7 @@ static void mmci_sdmmc_set_clkreg(struct mmci_host *host, unsigned int desired)
mmci_write_clkreg(host, clk);
}
-static void sdmmc_dlyb_input_ck(struct sdmmc_dlyb *dlyb)
+static void sdmmc_dlyb_mp15_input_ck(struct sdmmc_dlyb *dlyb)
{
if (!dlyb || !dlyb->base)
return;
@@ -316,7 +327,8 @@ static void mmci_sdmmc_set_pwrreg(struct mmci_host *host, unsigned int pwr)
/* adds OF options */
pwr = host->pwr_reg_add;
- sdmmc_dlyb_input_ck(dlyb);
+ if (dlyb && dlyb->ops->set_input_ck)
+ dlyb->ops->set_input_ck(dlyb);
if (ios.power_mode == MMC_POWER_OFF) {
/* Only a reset could power-off sdmmc */
@@ -430,8 +442,15 @@ static bool sdmmc_busy_complete(struct mmci_host *host, u32 status, u32 err_msk)
return true;
}
-static void sdmmc_dlyb_set_cfgr(struct sdmmc_dlyb *dlyb,
- int unit, int phase, bool sampler)
+static int sdmmc_dlyb_mp15_enable(struct sdmmc_dlyb *dlyb)
+{
+ writel_relaxed(DLYB_CR_DEN, dlyb->base + DLYB_CR);
+
+ return 0;
+}
+
+static int sdmmc_dlyb_mp15_set_cfg(struct sdmmc_dlyb *dlyb,
+ int unit, int phase, bool sampler)
{
u32 cfgr;
@@ -443,16 +462,18 @@ static void sdmmc_dlyb_set_cfgr(struct sdmmc_dlyb *dlyb,
if (!sampler)
writel_relaxed(DLYB_CR_DEN, dlyb->base + DLYB_CR);
+
+ return 0;
}
-static int sdmmc_dlyb_lng_tuning(struct mmci_host *host)
+static int sdmmc_dlyb_mp15_prepare(struct mmci_host *host)
{
struct sdmmc_dlyb *dlyb = host->variant_priv;
u32 cfgr;
int i, lng, ret;
for (i = 0; i <= DLYB_CFGR_UNIT_MAX; i++) {
- sdmmc_dlyb_set_cfgr(dlyb, i, DLYB_CFGR_SEL_MAX, true);
+ dlyb->ops->set_cfg(dlyb, i, DLYB_CFGR_SEL_MAX, true);
ret = readl_relaxed_poll_timeout(dlyb->base + DLYB_CFGR, cfgr,
(cfgr & DLYB_CFGR_LNGF),
@@ -482,10 +503,14 @@ static int sdmmc_dlyb_phase_tuning(struct mmci_host *host, u32 opcode)
{
struct sdmmc_dlyb *dlyb = host->variant_priv;
int cur_len = 0, max_len = 0, end_of_len = 0;
- int phase;
+ int phase, ret;
for (phase = 0; phase <= dlyb->max; phase++) {
- sdmmc_dlyb_set_cfgr(dlyb, dlyb->unit, phase, false);
+ ret = dlyb->ops->set_cfg(dlyb, dlyb->unit, phase, false);
+ if (ret) {
+ dev_err(mmc_dev(host->mmc), "tuning config failed\n");
+ return ret;
+ }
if (mmc_send_tuning(host->mmc, opcode, NULL)) {
cur_len = 0;
@@ -503,10 +528,15 @@ static int sdmmc_dlyb_phase_tuning(struct mmci_host *host, u32 opcode)
return -EINVAL;
}
- writel_relaxed(0, dlyb->base + DLYB_CR);
+ if (dlyb->ops->set_input_ck)
+ dlyb->ops->set_input_ck(dlyb);
phase = end_of_len - max_len / 2;
- sdmmc_dlyb_set_cfgr(dlyb, dlyb->unit, phase, false);
+ ret = dlyb->ops->set_cfg(dlyb, dlyb->unit, phase, false);
+ if (ret) {
+ dev_err(mmc_dev(host->mmc), "tuning reconfig failed\n");
+ return ret;
+ }
dev_dbg(mmc_dev(host->mmc), "unit:%d max_dly:%d phase:%d\n",
dlyb->unit, dlyb->max, phase);
@@ -519,6 +549,7 @@ static int sdmmc_execute_tuning(struct mmc_host *mmc, u32 opcode)
struct mmci_host *host = mmc_priv(mmc);
struct sdmmc_dlyb *dlyb = host->variant_priv;
u32 clk;
+ int ret;
if ((host->mmc->ios.timing != MMC_TIMING_UHS_SDR104 &&
host->mmc->ios.timing != MMC_TIMING_MMC_HS200) ||
@@ -528,7 +559,9 @@ static int sdmmc_execute_tuning(struct mmc_host *mmc, u32 opcode)
if (!dlyb || !dlyb->base)
return -EINVAL;
- writel_relaxed(DLYB_CR_DEN, dlyb->base + DLYB_CR);
+ ret = dlyb->ops->dlyb_enable(dlyb);
+ if (ret)
+ return ret;
/*
* SDMMC_FBCK is selected when an external Delay Block is needed
@@ -539,8 +572,9 @@ static int sdmmc_execute_tuning(struct mmc_host *mmc, u32 opcode)
clk |= MCI_STM32_CLK_SELFBCK;
mmci_write_clkreg(host, clk);
- if (sdmmc_dlyb_lng_tuning(host))
- return -EINVAL;
+ ret = dlyb->ops->tuning_prepare(host);
+ if (ret)
+ return ret;
return sdmmc_dlyb_phase_tuning(host, opcode);
}
@@ -598,6 +632,13 @@ static struct mmci_host_ops sdmmc_variant_ops = {
.post_sig_volt_switch = sdmmc_post_sig_volt_switch,
};
+static struct sdmmc_tuning_ops dlyb_tuning_mp15_ops = {
+ .dlyb_enable = sdmmc_dlyb_mp15_enable,
+ .set_input_ck = sdmmc_dlyb_mp15_input_ck,
+ .tuning_prepare = sdmmc_dlyb_mp15_prepare,
+ .set_cfg = sdmmc_dlyb_mp15_set_cfg,
+};
+
void sdmmc_variant_init(struct mmci_host *host)
{
struct device_node *np = host->mmc->parent->of_node;
@@ -616,6 +657,7 @@ void sdmmc_variant_init(struct mmci_host *host)
return;
dlyb->base = base_dlyb;
+ dlyb->ops = &dlyb_tuning_mp15_ops;
host->variant_priv = dlyb;
host->mmc_ops->execute_tuning = sdmmc_execute_tuning;
}
--
2.25.1
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