[PATCH v3] mmc: sdhci-pci: add Support of Synopsys DWC_MSHC IP

From: Prabu Thangamuthu
Date: Wed Apr 20 2016 - 08:23:15 EST

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Patch for Standard SD Host Controller Interface compliant Synopsys
sdhci-dwc controller driver. This code supports PCI based interface.

Signed-off-by: Prabu Thangamuthu <prabu.t@xxxxxxxxxxxx>
---
Change log v3:
-Removed unused code.
-Updated review comments.

Change log v2:
-Removed Synopsys specific PCI device ID's from pci_ids.h.
-Updated the PCI device ID's in sdhci-pci-core.c.

MAINTAINERS | 7 +
drivers/mmc/host/Makefile | 3 +-
drivers/mmc/host/sdhci-pci-core.c | 14 ++
drivers/mmc/host/sdhci-pci-dwc.c | 260 ++++++++++++++++++++++++++++++++++++++
drivers/mmc/host/sdhci-pci-dwc.h | 55 ++++++++
5 files changed, 338 insertions(+), 1 deletion(-)
create mode 100644 drivers/mmc/host/sdhci-pci-dwc.c
create mode 100644 drivers/mmc/host/sdhci-pci-dwc.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 1d5b4be..01b40da 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9751,6 +9751,13 @@ S: Maintained
F: include/linux/mmc/dw_mmc.h
F: drivers/mmc/host/dw_mmc*

+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-pci-dwc*
+
SYSTEM TRACE MODULE CLASS
M: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
S: Maintained
diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
index af918d2..092a746 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-pci-dwc.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 79e1901..4a7769c 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-pci-dwc.h"

/*****************************************************************************\
* *
@@ -70,6 +71,11 @@ static int ricoh_mmc_resume(struct sdhci_pci_chip *chip)
msleep(500);
return 0;
}
+/* Synopsys SDHCI compliant Controller */
+static const struct sdhci_pci_fixes sdhci_snps = {
+ .probe_slot = sdhci_pci_probe_slot_snps,
+ .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
+};

static const struct sdhci_pci_fixes sdhci_ricoh = {
.probe = ricoh_probe,
@@ -797,6 +803,14 @@ static const struct sdhci_pci_fixes sdhci_amd = {

static const struct pci_device_id pci_ids[] = {
{
+ .vendor = PCI_VENDOR_ID_SYNOPSYS,
+ .device = 0xc201, /* Device ID of sdhci-dwc on Haps51 */
+ .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,
diff --git a/drivers/mmc/host/sdhci-pci-dwc.c b/drivers/mmc/host/sdhci-pci-dwc.c
new file mode 100644
index 0000000..3490af8
--- /dev/null
+++ b/drivers/mmc/host/sdhci-pci-dwc.c
@@ -0,0 +1,260 @@
+/*
+ * Copyright (C) 2016 Synopsys, Inc.
+ *
+ * Author: Manjunath M B <manjumb@xxxxxxxxxxxx>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#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-pci-dwc.h"
+
+/*****************************************************************************\
+ * *
+ * Hardware specific clock handling *
+ * *
+\*****************************************************************************/
+static const struct sdhci_ops *sdhci_ops; /* Low level hw interface */
+
+static void snps_reset_dcm(struct sdhci_host *host,
+ unsigned int mask, unsigned char reset)
+{
+ u32 reg = 0;
+ u16 vendor_ptr = 0;
+
+ vendor_ptr = sdhci_readw(host, SDHCI_UHS2_VENDOR);
+
+ reg = sdhci_readl(host, (SDHC_GPIO_OUT + vendor_ptr));
+
+ if (reset == 1)
+ reg |= mask;
+ else
+ reg &= ~mask;
+
+ sdhci_writel(host, reg, (SDHC_GPIO_OUT + vendor_ptr));
+}
+
+static void sdhci_set_clock_snps(struct sdhci_host *host,
+ unsigned int clock)
+{
+ int div = 0;
+ int mul = 0;
+ int div_val = 0;
+ int mul_val = 0;
+ int mul_div_val = 0;
+ u32 reg = 0;
+ u16 clk = 0;
+ u16 vendor_ptr = 0;
+ u32 mask = 0;
+ unsigned long timeout;
+ u32 tx_clk_phase_val = SDHC_DEF_TX_CLK_PH_VAL;
+ u32 rx_clk_phase_val = SDHC_DEF_RX_CLK_PH_VAL;
+
+ /*
+ * if clock is less than 25MHz, divided clock is used.
+ * For divided clock, we can use the standard sdhci_set_clock().
+ * For clock above 25MHz, DRP clock is used
+ * Here, we cannot use sdhci_set_clock(), we need to program
+ * TX RX CLOCK DCM DRP for appropriate clock
+ */
+
+ if (clock <= 25000000) {
+ /* Then call generic set_clock */
+ if (sdhci_ops->set_clock)
+ sdhci_ops->set_clock(host, clock);
+ } else {
+
+ host->mmc->actual_clock = 0;
+ vendor_ptr = sdhci_readw(host, SDHCI_UHS2_VENDOR);
+
+ /* Select un-phase shifted clock before reset Tx Tuning DCM*/
+ reg = sdhci_readl(host, (SDHC_GPIO_OUT + vendor_ptr));
+ reg &= ~SDHC_TX_CLK_SEL_TUNED;
+ sdhci_writel(host, reg, (SDHC_GPIO_OUT + vendor_ptr));
+ mdelay(10);
+
+ sdhci_writew(host, 0, SDHCI_CLOCK_CONTROL);
+
+ /* Lets chose the Mulitplier value to be 0x2 */
+ mul = 0x2;
+ for (div = 1; div <= 32; div++) {
+ if (((host->max_clk * mul) / div)
+ <= clock)
+ break;
+ }
+ /*
+ * Set Programmable Clock Mode in the Clock
+ * Control register.
+ */
+ div_val = div - 1;
+ mul_val = mul - 1;
+
+ host->mmc->actual_clock = (host->max_clk * mul) / div;
+ /*
+ * Program the DCM DRP
+ * Step 1: Assert DCM Reset
+ * Step 2: Program the mul and div values in DRP
+ * Step 3: Read from DRP base 0x00 to restore DCM output as per
+ * www.xilinx.com/support/documentation/user_guides/ug191.pdf
+ * Step 4: De-Assert reset to DCM
+ */
+
+ mask = SDHC_CARD_TX_CLK_DCM_RST;
+ snps_reset_dcm(host, mask, 1);
+
+ mul_div_val = (mul_val << 8) | div_val;
+ sdhci_writew(host, mul_div_val, TXRX_CLK_DCM_MUL_DIV_DRP);
+
+ reg = sdhci_readl(host, TXRX_CLK_DCM_DRP_BASE_51);
+
+ snps_reset_dcm(host, mask, 0);
+
+ clk |= SDHCI_PROG_CLOCK_MODE | SDHCI_CLOCK_INT_EN;
+ sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
+
+ /* Wait max 20 ms */
+ timeout = 20;
+ while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
+ & SDHCI_CLOCK_INT_STABLE)) {
+ if (timeout == 0) {
+ pr_err("%s: Internal clock never stabilised\n",
+ mmc_hostname(host->mmc));
+ return;
+ }
+ timeout--;
+ mdelay(1);
+ }
+
+ clk |= SDHCI_CLOCK_CARD_EN;
+ sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
+
+ /*
+ * This Clock might have affected the TX CLOCK DCM and RX CLOCK
+ * DCM which are used for Phase control; Reset these DCM's
+ * for proper clock output
+ *
+ * Step 1: Reset the DCM
+ * Step 2: De-Assert reset to DCM
+ */
+
+ mask = SDHC_TUNING_TX_CLK_DCM_RST | SDHC_TUNING_RX_CLK_DCM_RST;
+ snps_reset_dcm(host, mask, 1);
+ mdelay(10);
+ snps_reset_dcm(host, mask, 0);
+
+ /* Select working phase value if clock is <= 50MHz */
+ if (clock <= 50000000) {
+ /*Change the Tx Phase value here */
+ reg = sdhci_readl(host, (SDHC_GPIO_OUT + vendor_ptr));
+ reg |= (SDHC_TUNING_TX_CLK_SEL_MASK &
+ (tx_clk_phase_val << SDHC_TUNING_TX_CLK_SEL_SHIFT));
+
+ sdhci_writel(host, reg, (SDHC_GPIO_OUT + vendor_ptr));
+ mdelay(10);
+
+ /* Program to select phase shifted clock */
+ reg |= SDHC_TX_CLK_SEL_TUNED;
+ sdhci_writel(host, reg, (SDHC_GPIO_OUT + vendor_ptr));
+
+ /*
+ * For 50Mhz, tuning is not possible.
+ * Lets fix the sampling Phase of Rx Clock here.
+ */
+ reg = sdhci_readl(host, (SDHC_DBOUNCE + vendor_ptr));
+ reg &= ~SDHC_TUNING_RX_CLK_SEL_MASK;
+ reg |= (SDHC_TUNING_RX_CLK_SEL_MASK &
+ rx_clk_phase_val);
+ sdhci_writel(host, reg, (SDHC_DBOUNCE + vendor_ptr));
+ }
+ mdelay(10);
+ }
+}
+
+static int snps_init_clock(struct sdhci_host *host)
+{
+ int div = 0;
+ int mul = 0;
+ int div_val = 0;
+ int mul_val = 0;
+ int mul_div_val = 0;
+ int reg = 0;
+ u32 mask = 0;
+
+ /* Configure the BCLK DRP to get 100 MHZ Clock */
+
+ /*
+ * To get 100MHz from 100MHz input freq,
+ * mul=2 and div=2
+ * Formula: output_clock = (input clock * mul) / div
+ */
+ mul = 2;
+ div = 2;
+ mul_val = mul - 1;
+ div_val = div - 1;
+ /*
+ * Program the DCM DRP
+ * Step 1: Assert DCM Reset
+ * Step 2: Program the mul and div values in DRP
+ * Step 3: Read from DRP base 0x00 to restore DCM output as per
+ * www.xilinx.com/support/documentation/user_guides/ug191.pdf
+ * Step 4: De-Assert reset to DCM
+ */
+ mask = SDHC_BCLK_DCM_RST;
+ snps_reset_dcm(host, mask, 1);
+
+ mul_div_val = (mul_val << 8) | div_val;
+ sdhci_writew(host, mul_div_val, BCLK_DCM_MUL_DIV_DRP);
+
+ reg = sdhci_readl(host, BCLK_DCM_DRP_BASE_51);
+
+ snps_reset_dcm(host, mask, 0);
+
+ /*
+ * By Default Clocks to Controller are OFF.
+ * Before stack applies reset; we need to turn on the clock
+ */
+ sdhci_writew(host, SDHCI_CLOCK_INT_EN, SDHCI_CLOCK_CONTROL);
+
+ return 0;
+
+}
+static struct sdhci_ops sdhci_pci_ops_snps = {
+ .set_clock = sdhci_set_clock_snps,
+};
+
+int sdhci_pci_probe_slot_snps(struct sdhci_pci_slot *slot)
+{
+ int ret = 0;
+ struct sdhci_host *host;
+
+ host = slot->host;
+ sdhci_ops = host->ops;
+
+ sdhci_pci_ops_snps.enable_dma = sdhci_ops->enable_dma;
+ sdhci_pci_ops_snps.set_bus_width = sdhci_ops->set_bus_width;
+ sdhci_pci_ops_snps.reset = sdhci_ops->reset;
+ sdhci_pci_ops_snps.set_uhs_signaling = sdhci_ops->set_uhs_signaling;
+ sdhci_pci_ops_snps.hw_reset = sdhci_ops->hw_reset;
+
+ host->ops = &sdhci_pci_ops_snps;
+
+ /* Board specific clock initialization */
+ ret = snps_init_clock(host);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(sdhci_pci_probe_slot_snps);
diff --git a/drivers/mmc/host/sdhci-pci-dwc.h b/drivers/mmc/host/sdhci-pci-dwc.h
new file mode 100644
index 0000000..02e2213
--- /dev/null
+++ b/drivers/mmc/host/sdhci-pci-dwc.h
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2016 Synopsys, Inc.
+ *
+ * Author: Manjunath M B <manjumb@xxxxxxxxxxxx>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef __SDHCI_DWC_MSHC_PCI_H__
+#define __SDHCI_DWC_MSHC_PCI_H__
+
+#include "sdhci-pci.h"
+
+#define SDHCI_UHS2_VENDOR 0xE8
+
+#define DRIVER_NAME "sdhci-pci-dwc"
+#define SDHC_DEF_TX_CLK_PH_VAL 4
+#define SDHC_DEF_RX_CLK_PH_VAL 4
+
+/* Synopsys Vendor Specific Registers */
+#define SDHC_DBOUNCE 0x08
+#define SDHC_TUNING_RX_CLK_SEL_MASK 0x000000FF
+#define SDHC_GPIO_OUT 0x34
+/* HAPS 51 Based implementation */
+#define SDHC_BCLK_DCM_RST 0x00000001
+#define SDHC_CARD_TX_CLK_DCM_RST 0x00000002
+#define SDHC_TUNING_RX_CLK_DCM_RST 0x00000004
+#define SDHC_TUNING_TX_CLK_DCM_RST 0x00000008
+#define SDHC_TUNING_TX_CLK_SEL_MASK 0x00000070
+#define SDHC_TUNING_TX_CLK_SEL_SHIFT 4
+#define SDHC_TX_CLK_SEL_TUNED 0x00000080
+
+/* Offset of BCLK DCM DRP Attributes */
+/* Every attribute is of 16 bit wide */
+#define BCLK_DCM_DRP_BASE_51 0x1000
+
+#define BCLK_DCM_MUL_DIV_DRP 0x1050
+#define MUL_MASK_DRP 0xFF00
+#define DIV_MASK_DRP 0x00FF
+
+/* Offset of TX and RX CLK DCM DRP */
+#define TXRX_CLK_DCM_DRP_BASE_51 0x2000
+#define TXRX_CLK_DCM_MUL_DIV_DRP 0x2050
+
+int sdhci_pci_probe_slot_snps(struct sdhci_pci_slot *slot);
+
+#endif
--
1.9.1

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