[RESEND PATCH v4.9, 1/1] mmc: sdhci-dwc-mshc-pci: synopsys dwc mshc support

From: Prabu Thangamuthu
Date: Thu Apr 12 2018 - 11:47:23 EST

This patch is intended for linux-4.9.y branch.

Synopsys DWC MSHC IP is complaint to SD Standard Host Controller Interface
specification. This patch is to enable DWC MSHC controller on HPAS-DX
platform connected using PCIe interface.

As clock generation logic is implemented in MMCM block of HAPS-DX platform,
we need separate functions to control the MMCM module to generate required
clocks with respect to mode of operations. Also we have the platform
specific set_power function to support different VDD of eMMC devices.

Signed-off-by: Prabu Thangamuthu <prabu.t@xxxxxxxxxxxx>
---
MAINTAINERS | 7 ++
drivers/mmc/host/Makefile | 3 +-
drivers/mmc/host/sdhci-dwc-mshc-pci.c | 139
++++++++++++++++++++++++++++++++++
drivers/mmc/host/sdhci-dwc-mshc-pci.h | 44 +++++++++++
drivers/mmc/host/sdhci-pci-core.c | 25 ++++++
5 files changed, 217 insertions(+), 1 deletion(-)
create mode 100644 drivers/mmc/host/sdhci-dwc-mshc-pci.c
create mode 100644 drivers/mmc/host/sdhci-dwc-mshc-pci.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 63cefa6..869b92b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -10808,6 +10808,13 @@ S: Maintained
F: drivers/mmc/host/sdhci*
F: include/linux/mmc/sdhci*

+SYNOPSYS SDHCI COMPLIANT DWC MSHC DRIVER
+M: Prabu Thangamuthu <prabu.t@xxxxxxxxxxxx>
+M: Manjunath M B <manjumb@xxxxxxxxxxxx>
+L: linux-mmc@xxxxxxxxxxxxxxx
+S: Maintained
+F: drivers/mmc/host/sdhci-dwc*
+
SECURE COMPUTING
M: Kees Cook <keescook@xxxxxxxxxxxx>
R: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index e2bdaaf4..e83355f 100644
--- a/drivers/mmc/host/Makefile
+++ b/drivers/mmc/host/Makefile
@@ -9,7 +9,8 @@ obj-$(CONFIG_MMC_MXC) += mxcmmc.o
obj-$(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-y += sdhci-pci-core.o sdhci-pci-o2micro.o \
+ sdhci-dwc-mshc-pci.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-dwc-mshc-pci.c
b/drivers/mmc/host/sdhci-dwc-mshc-pci.c
new file mode 100644
index 0000000..4721cc7
--- /dev/null
+++ b/drivers/mmc/host/sdhci-dwc-mshc-pci.c
@@ -0,0 +1,139 @@
+/*
+ * SDHCI driver for Synopsys DWC_MSHC controller
+ *
+ * Copyright (C) 2017-2018 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Authors:
+ * Prabu Thangamuthu <prabut@xxxxxxxxxxxx>
+ * Manjunath M B <manjumb@xxxxxxxxxxxx>
+ *
+ * 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.
+ */
+
+#include <linux/pci.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+
+#include "sdhci.h"
+#include "sdhci-pci.h"
+#include "sdhci-dwc-mshc-pci.h"
+
+#define DRIVER_NAME "sdhci_snps"
+
+/* Default emmc vdd is set to 1.8V */
+static unsigned int emmc_vdd = SDHC_EMMC_VDD_180V;
+module_param(emmc_vdd, int, 0444);
+
+void sdhci_snps_set_clock(struct sdhci_host *host, unsigned int clock)
+{
+ u16 clk = 0;
+ u32 reg = 0;
+ u32 vendor_ptr = 0;
+
+ vendor_ptr = sdhci_readw(host, SDHCI_VENDOR_PTR_R);
+
+ /* Disable Software managed rx tuning */
+ reg = sdhci_readl(host, (SDHC_AT_CTRL_R + vendor_ptr));
+ reg &= ~SDHC_SW_TUNE_EN;
+ sdhci_writel(host, reg, (SDHC_AT_CTRL_R + vendor_ptr));
+
+ if (clock <= 52000000) {
+ sdhci_set_clock(host, clock);
+ } else {
+ /* Assert reset to MMCM */
+ reg = sdhci_readl(host, (SDHC_GPIO_OUT + vendor_ptr));
+ reg |= SDHC_CCLK_MMCM_RST;
+ sdhci_writel(host, reg, (SDHC_GPIO_OUT + vendor_ptr));
+
+ /* Configure MMCM*/
+ sdhci_writel(host, DIV_REG_100_MHZ, SDHC_MMCM_DIV_REG);
+ sdhci_writel(host, CLKFBOUT_100_MHZ,
+ SDHC_MMCM_CLKFBOUT);
+
+ /* De-assert reset to MMCM*/
+ reg = sdhci_readl(host, (SDHC_GPIO_OUT + vendor_ptr));
+ reg &= ~SDHC_CCLK_MMCM_RST;
+ sdhci_writel(host, reg, (SDHC_GPIO_OUT + vendor_ptr));
+
+ /* Enable clock */
+ clk = SDHCI_PROG_CLOCK_MODE | SDHCI_CLOCK_INT_EN |
+ SDHCI_CLOCK_CARD_EN;
+ sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
+ }
+}
+EXPORT_SYMBOL_GPL(sdhci_snps_set_clock);
+
+void sdhci_snps_set_power(struct sdhci_host *host, unsigned char mode,
+ unsigned short vdd)
+{
+ u8 pwr = 0;
+ u16 ctrl;
+
+ if (mode != MMC_POWER_OFF) {
+ switch (1 << vdd) {
+ case MMC_VDD_165_195:
+ pwr = SDHCI_POWER_180;
+ break;
+ case MMC_VDD_29_30:
+ case MMC_VDD_30_31:
+ pwr = SDHCI_POWER_300;
+ break;
+ case MMC_VDD_32_33:
+ case MMC_VDD_33_34:
+ pwr = SDHCI_POWER_330;
+ break;
+ default:
+ WARN(1, "%s: Invalid vdd %#x\n",
+ mmc_hostname(host->mmc), vdd);
+ break;
+ }
+ }
+
+ if (host->pwr == pwr)
+ return;
+
+ host->pwr = pwr;
+
+ if (pwr == 0) {
+ sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
+ } else {
+ sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
+
+ /*
+ * Enable it for eMMC phy cfg1 test with 1.8V mode
+ */
+ if (emmc_vdd == SDHC_EMMC_VDD_180V) {
+ pwr = SDHCI_POWER_180;
+ sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
+
+ ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+ /*
+ * Enable 1.8V Signal Enable in the Host Control2
+ * register
+ */
+ ctrl |= SDHCI_CTRL_VDD_180;
+ sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
+ }
+ pwr |= SDHCI_POWER_ON;
+
+ sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
+ }
+}
+EXPORT_SYMBOL_GPL(sdhci_snps_set_power);
+
+int sdhci_snps_pci_probe_slot(struct sdhci_pci_slot *slot)
+{
+ struct sdhci_host *host = slot->host;
+
+ host->caps = sdhci_readl(host, SDHCI_CAPABILITIES);
+ host->caps1 = sdhci_readl(host, SDHCI_CAPABILITIES_1);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(sdhci_snps_pci_probe_slot);
+
+MODULE_PARM_DESC(emmc_vdd, "VDD to configure eMMC device supply voltage");
+
diff --git a/drivers/mmc/host/sdhci-dwc-mshc-pci.h
b/drivers/mmc/host/sdhci-dwc-mshc-pci.h
new file mode 100644
index 0000000..97f5529
--- /dev/null
+++ b/drivers/mmc/host/sdhci-dwc-mshc-pci.h
@@ -0,0 +1,44 @@
+/*
+ * SDHCI driver for Synopsys DWC_MSHC controller
+ *
+ * Copyright (C) 2017-2018 Synopsys, Inc. (www.synopsys.com)
+ *
+ * Authors:
+ * Prabu Thangamuthu <prabut@xxxxxxxxxxxx>
+ * Manjunath M B <manjumb@xxxxxxxxxxxx>
+ *
+ * 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.
+ */
+
+#ifndef __SDHCI_DWC_MSHC_PCI_H__
+#define __SDHCI_DWC_MSHC_PCI_H__
+
+#define SDHCI_VENDOR_PTR_R 0xE8
+
+/* Module Parameters */
+#define SDHC_EMMC_VDD_330V 33
+#define SDHC_EMMC_VDD_180V 18
+
+/* Synopsys Vendor Specific Registers */
+#define SDHC_GPIO_OUT 0x34
+#define SDHC_AT_CTRL_R 0x40
+
+#define SDHC_SW_TUNE_EN 0x00000010
+
+/* MMCM DRP */
+#define SDHC_MMCM_DIV_REG 0x1020
+#define DIV_REG_100_MHZ 0x1145
+
+#define SDHC_MMCM_CLKFBOUT 0x1024
+#define CLKFBOUT_100_MHZ 0x0000
+
+#define SDHC_CCLK_MMCM_RST 0x00000001
+
+int sdhci_snps_pci_probe_slot(struct sdhci_pci_slot *slot);
+void sdhci_snps_set_clock(struct sdhci_host *host, unsigned int clock);
+void sdhci_snps_set_power(struct sdhci_host *host, unsigned char mode,
+ unsigned short vdd);
+
+#endif
diff --git a/drivers/mmc/host/sdhci-pci-core.c
b/drivers/mmc/host/sdhci-pci-core.c
index b0b9ceb..f16ae5b 100644
--- a/drivers/mmc/host/sdhci-pci-core.c
+++ b/drivers/mmc/host/sdhci-pci-core.c
@@ -31,6 +31,7 @@
#include "sdhci.h"
#include "sdhci-pci.h"
#include "sdhci-pci-o2micro.h"
+#include "sdhci-dwc-mshc-pci.h"

static int sdhci_pci_enable_dma(struct sdhci_host *host);
static void sdhci_pci_set_bus_width(struct sdhci_host *host, int width);
@@ -79,6 +80,23 @@ static int ricoh_mmc_resume(struct sdhci_pci_chip *chip)
return 0;
}

+/* Synopsys DWC MSHC Controller based on SDHCI-PCI */
+static const struct sdhci_ops sdhci_snps_ops = {
+ .set_clock = sdhci_snps_set_clock,
+ .set_power = sdhci_snps_set_power,
+ .enable_dma = sdhci_pci_enable_dma,
+ .set_bus_width = sdhci_pci_set_bus_width,
+ .reset = sdhci_reset,
+ .set_uhs_signaling = sdhci_set_uhs_signaling,
+ .hw_reset = sdhci_pci_hw_reset,
+ .select_drive_strength = sdhci_pci_select_drive_strength,
+};
+
+static const struct sdhci_pci_fixes sdhci_snps = {
+ .probe_slot = sdhci_snps_pci_probe_slot,
+ .ops = &sdhci_snps_ops,
+};
+
static const struct sdhci_pci_fixes sdhci_ricoh = {
.probe = ricoh_probe,
.quirks = SDHCI_QUIRK_32BIT_DMA_ADDR |
@@ -857,6 +875,13 @@ static int amd_probe(struct sdhci_pci_chip *chip)

static const struct pci_device_id pci_ids[] = {
{
+ .vendor = 0x16c3, /* Synopsys Vendor ID */
+ .device = 0xc202, /* IPK HAPS_Dx */
+ .subvendor = PCI_ANY_ID,
+ .subdevice = PCI_ANY_ID,
+ .driver_data = (kernel_ulong_t)&sdhci_snps,
+ },
+ {
.vendor = PCI_VENDOR_ID_RICOH,
.device = PCI_DEVICE_ID_RICOH_R5C822,
.subvendor = PCI_ANY_ID,
--
1.9.1