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Date:   Mon, 12 Aug 2019 18:58:26 -0400
From:   "Michael K. Johnson" <johnsonm@danlj.org>
To:     Adrian Hunter <adrian.hunter@intel.com>
Cc:     ulf.hansson@linaro.org, linux-kernel@vger.kernel.org,
        linux-mmc@vger.kernel.org,
        Ben Chuang <ben.chuang@genesyslogic.com.tw>
Subject: Re: [PATCH v3 3/2] mmc: host: sdhci-pci: add Genesys Logic GL975x
 support
Message-ID: <20190812225826.GC30758@people.danlj.org>
References: <20190726020754.GA12078@people.danlj.org>
 <62a756ff-6432-fd43-5e90-038eb28045cd@intel.com>
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In-Reply-To: <62a756ff-6432-fd43-5e90-038eb28045cd@intel.com>
User-Agent: Mutt/1.5.21 (2010-09-15)
Sender: linux-kernel-owner@vger.kernel.org
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Add support for the GL9750 and GL9755 chipsets.

Signed-off-by: Ben Chuang <ben.chuang@genesyslogic.com.tw>
Co-developed-by: Michael K Johnson <johnsonm@danlj.org>
Signed-off-by: Michael K Johnson <johnsonm@danlj.org>

diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index 73578718f119..661445415090 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -13,7 +13,7 @@ obj-$(CONFIG_MMC_MXS)		+= mxs-mmc.o
 obj-$(CONFIG_MMC_SDHCI)		+= sdhci.o
 obj-$(CONFIG_MMC_SDHCI_PCI)	+= sdhci-pci.o
 sdhci-pci-y			+= sdhci-pci-core.o sdhci-pci-o2micro.o sdhci-pci-arasan.o \
-				   sdhci-pci-dwc-mshc.o
+				   sdhci-pci-dwc-mshc.o sdhci-pci-gli.o
 obj-$(subst m,y,$(CONFIG_MMC_SDHCI_PCI))	+= sdhci-pci-data.o
 obj-$(CONFIG_MMC_SDHCI_ACPI)	+= sdhci-acpi.o
 obj-$(CONFIG_MMC_SDHCI_PXAV3)	+= sdhci-pxav3.o
diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
index 4154ee11b47d..e5835fbf73bc 100644
--- a/drivers/mmc/host/sdhci-pci-core.c
+++ b/drivers/mmc/host/sdhci-pci-core.c
@@ -1682,6 +1682,8 @@ static const struct pci_device_id pci_ids[] = {
 	SDHCI_PCI_DEVICE(O2, SEABIRD1, o2),
 	SDHCI_PCI_DEVICE(ARASAN, PHY_EMMC, arasan),
 	SDHCI_PCI_DEVICE(SYNOPSYS, DWC_MSHC, snps),
+	SDHCI_PCI_DEVICE(GLI, 9750, gl9750),
+	SDHCI_PCI_DEVICE(GLI, 9755, gl9755),
 	SDHCI_PCI_DEVICE_CLASS(AMD, SYSTEM_SDHCI, PCI_CLASS_MASK, amd),
 	/* Generic SD host controller */
 	{PCI_DEVICE_CLASS(SYSTEM_SDHCI, PCI_CLASS_MASK)},
diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
new file mode 100644
index 000000000000..3eed4c9eb7ca
--- /dev/null
+++ b/drivers/mmc/host/sdhci-pci-gli.c
@@ -0,0 +1,378 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2019 Genesys Logic, Inc.
+ *
+ * Authors: Ben Chuang <ben.chuang@genesyslogic.com.tw>
+ *
+ * Version: v0.9.0 (2019-08-08)
+ */
+
+#include <linux/pci.h>
+#include <linux/mmc/mmc.h>
+#include <linux/delay.h>
+#include "sdhci.h"
+#include "sdhci-pci.h"
+
+/*  Genesys Logic extra registers */
+#define SDHCI_GLI_9750_WT         0x800
+#define SDHCI_GLI_9750_DRIVING    0x860
+#define SDHCI_GLI_9750_PLL        0x864
+#define SDHCI_GLI_9750_SW_CTRL    0x874
+#define SDHCI_GLI_9750_MISC       0x878
+
+#define SDHCI_GLI_9750_TUNING_CONTROL		0x540
+#define SDHCI_GLI_9750_TUNING_PARAMETERS	0x544
+
+#define GLI_MAX_TUNING_LOOP 40
+
+/* Genesys Logic chipset */
+static void gli_set_9750(struct sdhci_host *host)
+{
+	u32 wt_value = 0;
+	u32 driving_value = 0;
+	u32 pll_value = 0;
+	u32 sw_ctrl_value = 0;
+	u32 misc_value = 0;
+	u32 parameter_value = 0;
+	u32 control_value = 0;
+
+	u16 ctrl2 = 0;
+
+	wt_value = sdhci_readl(host, SDHCI_GLI_9750_WT);
+	if ((wt_value & 0x1) == 0) {
+		wt_value |= 0x1;
+		sdhci_writel(host, wt_value, SDHCI_GLI_9750_WT);
+	}
+
+	driving_value = sdhci_readl(host, SDHCI_GLI_9750_DRIVING);
+	pll_value = sdhci_readl(host, SDHCI_GLI_9750_PLL);
+	sw_ctrl_value = sdhci_readl(host, SDHCI_GLI_9750_SW_CTRL);
+	misc_value = sdhci_readl(host, SDHCI_GLI_9750_MISC);
+	parameter_value = sdhci_readl(host, SDHCI_GLI_9750_TUNING_PARAMETERS);
+	control_value = sdhci_readl(host, SDHCI_GLI_9750_TUNING_CONTROL);
+
+	driving_value &= ~(0x0C000FFF);
+	driving_value |= 0x0C000FFF;
+	sdhci_writel(host, driving_value, SDHCI_GLI_9750_DRIVING);
+
+	sw_ctrl_value |= 0xc0;
+	sdhci_writel(host, sw_ctrl_value, SDHCI_GLI_9750_SW_CTRL);
+
+	// reset the tuning flow after reinit and before starting tuning
+	pll_value |= 0x800000; // bit23-1
+	pll_value &= ~(0x00700000); // bit22:20-0
+
+	misc_value &= ~(0x8); // bit3-0
+	misc_value &= ~(0x4); // bit2-0
+
+	misc_value &= ~(0x70); // bit6:4-0
+	misc_value |= 0x50; // bit6:4-5
+
+	parameter_value &= ~(0x7); // bit2:0-0
+	parameter_value |= 0x1; // bit2:0-1
+
+	control_value &= ~(0x190000); // bit20:19-0, bit16-0
+	control_value |=   0x110000; // bit20:19-b10, bit16-1
+
+	sdhci_writel(host, pll_value, SDHCI_GLI_9750_PLL);
+	sdhci_writel(host, misc_value, SDHCI_GLI_9750_MISC);
+
+	// disable tuned clk
+	ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+	ctrl2 &= ~SDHCI_CTRL_TUNED_CLK;
+	sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);
+
+	// 540 enable tuning parameters control
+	control_value |= 0x10;
+	sdhci_writel(host, control_value, SDHCI_GLI_9750_TUNING_CONTROL);
+
+	// write 544 tuning parameters
+	sdhci_writel(host, parameter_value, SDHCI_GLI_9750_TUNING_PARAMETERS);
+
+	// 540 disable tuning parameters control
+	control_value &= ~0x10;
+	sdhci_writel(host, control_value, SDHCI_GLI_9750_TUNING_CONTROL);
+
+	// clear tuned clk
+	ctrl2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+	ctrl2 &= ~SDHCI_CTRL_TUNED_CLK;
+	sdhci_writew(host, ctrl2, SDHCI_HOST_CONTROL2);
+
+	udelay(1);
+	wt_value = sdhci_readl(host, SDHCI_GLI_9750_WT);
+	wt_value &= ~0x1;
+	sdhci_writel(host, wt_value, SDHCI_GLI_9750_WT);
+}
+
+static void sdhci_gli_do_reset(struct sdhci_host *host, u8 mask)
+{
+	host->ops->reset(host, mask);
+
+	if (mask & SDHCI_RESET_ALL) {
+		if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
+			if (host->ops->enable_dma)
+				host->ops->enable_dma(host);
+		}
+
+		/* Resetting the controller clears many */
+		host->preset_enabled = false;
+	}
+}
+
+static void sdhci_gli_abort_tuning(struct sdhci_host *host, u32 opcode)
+{
+	sdhci_reset_tuning(host);
+
+	sdhci_gli_do_reset(host, SDHCI_RESET_CMD);
+	sdhci_gli_do_reset(host, SDHCI_RESET_DATA);
+
+	sdhci_end_tuning(host);
+
+	mmc_abort_tuning(host->mmc, opcode);
+}
+
+static void gli_set_9750_rx_inv(struct sdhci_host *host, bool b)
+{
+	u32 wt_value = sdhci_readl(host, SDHCI_GLI_9750_WT);
+	u32 misc_value = sdhci_readl(host, SDHCI_GLI_9750_MISC);
+
+	if ((wt_value & 0x1) == 0) {
+		wt_value |= 0x1;
+		sdhci_writel(host, wt_value, SDHCI_GLI_9750_WT);
+	}
+
+	misc_value = sdhci_readl(host, SDHCI_GLI_9750_MISC);
+	if (b) {
+		misc_value |= 0x8;
+		sdhci_writel(host, misc_value, SDHCI_GLI_9750_MISC);
+	} else {
+		misc_value &= ~0x8;
+		sdhci_writel(host, misc_value, SDHCI_GLI_9750_MISC);
+	}
+
+	wt_value = sdhci_readl(host, SDHCI_GLI_9750_WT);
+	wt_value &= ~0x1;
+	sdhci_writel(host, wt_value, SDHCI_GLI_9750_WT);
+}
+
+static int __sdhci_execute_tuning_9750(struct sdhci_host *host, u32 opcode)
+{
+	int i;
+	int rx_inv = 0;
+
+	for (rx_inv = 0; rx_inv < 2; rx_inv++) {
+		if (rx_inv & 0x1)
+			gli_set_9750_rx_inv(host, true);
+		else
+			gli_set_9750_rx_inv(host, false);
+
+		sdhci_start_tuning(host);
+
+		for (i = 0; i < GLI_MAX_TUNING_LOOP; i++) {
+			u16 ctrl;
+
+			sdhci_send_tuning(host, opcode);
+
+			if (!host->tuning_done) {
+				if (rx_inv == 1) {
+					pr_info("%s: Tuning timeout, falling back to fixed sampling clock\n",
+						mmc_hostname(host->mmc));
+					sdhci_gli_abort_tuning(host, opcode);
+					return -ETIMEDOUT;
+				}
+				pr_info("%s: Tuning timeout, try next tuning\n",
+					mmc_hostname(host->mmc));
+				sdhci_gli_abort_tuning(host, opcode);
+				break;
+			}
+
+			ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+			if (!(ctrl & SDHCI_CTRL_EXEC_TUNING)) {
+				if (ctrl & SDHCI_CTRL_TUNED_CLK)
+					return 0; /* Success! */
+				break;
+			}
+		}
+	}
+
+	pr_info("%s: Tuning failed, falling back to fixed sampling clock\n",
+		mmc_hostname(host->mmc));
+	sdhci_reset_tuning(host);
+	return -EAGAIN;
+}
+
+static int gl9750_execute_tuning(struct mmc_host *mmc, u32 opcode)
+{
+	struct sdhci_host *host = mmc_priv(mmc);
+	int err = 0;
+	unsigned int tuning_count = 0;
+	bool hs400_tuning;
+
+	hs400_tuning = host->flags & SDHCI_HS400_TUNING;
+
+	if (host->tuning_mode == SDHCI_TUNING_MODE_1)
+		tuning_count = host->tuning_count;
+
+	/*
+	 * The Host Controller needs tuning in case of SDR104 and DDR50
+	 * mode, and for SDR50 mode when Use Tuning for SDR50 is set in
+	 * the Capabilities register.
+	 * If the Host Controller supports the HS200 mode then the
+	 * tuning function has to be executed.
+	 */
+	switch (host->timing) {
+	/* HS400 tuning is done in HS200 mode */
+	case MMC_TIMING_MMC_HS400:
+		err = -EINVAL;
+		goto out;
+
+	case MMC_TIMING_MMC_HS200:
+		/*
+		 * Periodic re-tuning for HS400 is not expected to be needed, so
+		 * disable it here.
+		 */
+		if (hs400_tuning)
+			tuning_count = 0;
+		break;
+
+	case MMC_TIMING_UHS_SDR104:
+	case MMC_TIMING_UHS_DDR50:
+	case MMC_TIMING_UHS_SDR50:
+		break;
+
+	default:
+		goto out;
+	}
+
+	if (host->ops->platform_execute_tuning) {
+		err = host->ops->platform_execute_tuning(host, opcode);
+		goto out;
+	}
+
+	host->mmc->retune_period = tuning_count;
+
+	if (host->tuning_delay < 0)
+		host->tuning_delay = opcode == MMC_SEND_TUNING_BLOCK;
+
+	gli_set_9750(host);
+	host->tuning_err = __sdhci_execute_tuning_9750(host, opcode);
+
+	sdhci_end_tuning(host);
+out:
+	host->flags &= ~SDHCI_HS400_TUNING;
+
+	return err;
+}
+
+static int gli_probe_slot_gl9750(struct sdhci_pci_slot *slot)
+{
+	struct sdhci_host *host = slot->host;
+	struct mmc_host_ops *ops = &host->mmc_host_ops;
+
+	slot->host->mmc->caps2 |= MMC_CAP2_NO_SDIO;
+	sdhci_enable_v4_mode(host);
+
+	ops->execute_tuning = gl9750_execute_tuning;
+
+	return 0;
+}
+
+static int gli_probe_slot_gl9755(struct sdhci_pci_slot *slot)
+{
+	struct sdhci_host *host = slot->host;
+
+	slot->host->mmc->caps2 |= MMC_CAP2_NO_SDIO;
+	sdhci_enable_v4_mode(host);
+
+	return 0;
+}
+
+static void sdhci_gli_voltage_switch(struct sdhci_host *host)
+{
+	usleep_range(5000, 5500);
+}
+
+static void sdhci_gli_pci_hw_reset(struct sdhci_host *host)
+{
+	struct sdhci_pci_slot *slot = sdhci_priv(host);
+
+	if (slot->hw_reset)
+		slot->hw_reset(host);
+}
+
+static void sdhci_gli_reset(struct sdhci_host *host, u8 mask)
+{
+	ktime_t timeout;
+
+	sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
+
+	if (mask & SDHCI_RESET_ALL)
+		host->clock = 0;
+
+	/* Wait max 100 ms */
+	timeout = ktime_add_ms(ktime_get(), 100);
+
+	/* hw clears the bit when it's done */
+	while (1) {
+		bool timedout = ktime_after(ktime_get(), timeout);
+
+		if (!(sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask))
+			break;
+		if (timedout) {
+			pr_err("%s: Reset 0x%x never completed.\n",
+				mmc_hostname(host->mmc), (int)mask);
+			sdhci_dumpregs(host);
+			return;
+		}
+		udelay(10);
+	}
+	gli_set_9750(host);
+}
+
+static u32 sdhci_gl9750_readl(struct sdhci_host *host, int reg)
+{
+	u32 value;
+
+	value = readl(host->ioaddr + reg);
+	if (unlikely(reg == SDHCI_MAX_CURRENT)) {
+		if (!(value & 0xff))
+			value |= 0xc8;
+	}
+	return value;
+}
+
+static const struct sdhci_ops sdhci_gl9755_ops = {
+	.set_clock		= sdhci_set_clock,
+	.enable_dma		= sdhci_pci_enable_dma,
+	.set_bus_width		= sdhci_set_bus_width,
+	.reset			= sdhci_gli_reset,
+	.set_uhs_signaling	= sdhci_set_uhs_signaling,
+	.hw_reset		= sdhci_gli_pci_hw_reset,
+	.voltage_switch		= sdhci_gli_voltage_switch,
+};
+
+const struct sdhci_pci_fixes sdhci_gl9755 = {
+	.quirks		= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
+	.quirks2	= SDHCI_QUIRK2_BROKEN_DDR50,
+	.probe_slot	= gli_probe_slot_gl9755,
+	.ops            = &sdhci_gl9755_ops,
+};
+
+static const struct sdhci_ops sdhci_gl9750_ops = {
+	.read_l                 = sdhci_gl9750_readl,
+	.set_clock		= sdhci_set_clock,
+	.enable_dma		= sdhci_pci_enable_dma,
+	.set_bus_width		= sdhci_set_bus_width,
+	.reset			= sdhci_reset,
+	.set_uhs_signaling	= sdhci_set_uhs_signaling,
+	.hw_reset		= sdhci_gli_pci_hw_reset,
+	.voltage_switch		= sdhci_gli_voltage_switch,
+};
+
+const struct sdhci_pci_fixes sdhci_gl9750 = {
+	.quirks		= SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
+	.quirks2	= SDHCI_QUIRK2_BROKEN_DDR50,
+	.probe_slot	= gli_probe_slot_gl9750,
+	.ops            = &sdhci_gl9750_ops,
+};
+
diff --git a/drivers/mmc/host/sdhci-pci.h b/drivers/mmc/host/sdhci-pci.h
index e5dc6e44c7a4..738ba5afcc20 100644
--- a/drivers/mmc/host/sdhci-pci.h
+++ b/drivers/mmc/host/sdhci-pci.h
@@ -65,6 +65,9 @@
 
 #define PCI_DEVICE_ID_SYNOPSYS_DWC_MSHC 0xc202
 
+#define PCI_DEVICE_ID_GLI_9755		0x9755
+#define PCI_DEVICE_ID_GLI_9750		0x9750
+
 /*
  * PCI device class and mask
  */
@@ -185,5 +188,7 @@ int sdhci_pci_enable_dma(struct sdhci_host *host);
 extern const struct sdhci_pci_fixes sdhci_arasan;
 extern const struct sdhci_pci_fixes sdhci_snps;
 extern const struct sdhci_pci_fixes sdhci_o2;
+extern const struct sdhci_pci_fixes sdhci_gl9750;
+extern const struct sdhci_pci_fixes sdhci_gl9755;
 
 #endif /* __SDHCI_PCI_H */