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Date: Thu, 24 May 2018 11:35:07 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Prabu Thangamuthu <Prabu.T@...opsys.com>,
"ulf.hansson@...aro.org" <ulf.hansson@...aro.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>
Cc: Manjunath M Bettegowda <Manjunath.MB@...opsys.com>
Subject: Re: [PATCH 1/1] mmc: sdhci-pci-dwc-mshc: synopsys dwc mshc support
Hi
This patch is mangled.
On 22/05/18 09:42, Prabu Thangamuthu wrote:
> To enable Synopsys DWC MSHC controller on HPAS-DX platform connected using
> PCIe interface. As Clock generation logic is implemented in MMCM module of
> HAPS-DX platform, we have separate functions to control the MMCM to
> generate required clocks with respect to speed mode. Also we have platform
> specific set_power function to support different VDD of eMMC devices.
>
> Signed-off-by: Prabu Thangamuthu <prabu.t@...opsys.com>
> ---
> MAINTAINERS | 7 ++
> drivers/mmc/host/Makefile | 3 +-
> drivers/mmc/host/sdhci-pci-core.c | 1 +
> drivers/mmc/host/sdhci-pci-dwc-mshc.c | 146
> ++++++++++++++++++++++++++++++++++
> drivers/mmc/host/sdhci-pci-dwc-mshc.h | 37 +++++++++
> drivers/mmc/host/sdhci-pci.h | 3 +
> 6 files changed, 196 insertions(+), 1 deletion(-)
> create mode 100644 drivers/mmc/host/sdhci-pci-dwc-mshc.c
> create mode 100644 drivers/mmc/host/sdhci-pci-dwc-mshc.h
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 9051a9c..f1749c4 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -12643,6 +12643,13 @@ S: Maintained
> F: drivers/mmc/host/sdhci*
> F: include/linux/mmc/sdhci*
>
> +SYNOPSYS SDHCI COMPLIANT DWC MSHC DRIVER
> +M: Prabu Thangamuthu <prabu.t@...opsys.com>
> +M: Manjunath M B <manjumb@...opsys.com>
> +L: linux-mmc@...r.kernel.org
> +S: Maintained
> +F: drivers/mmc/host/sdhci-pci-dwc-mshc*
> +
> SECURE DIGITAL HOST CONTROLLER INTERFACE (SDHCI) SAMSUNG DRIVER
> M: Ben Dooks <ben-linux@...ff.org>
> M: Jaehoon Chung <jh80.chung@...sung.com>
> diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
> index 6aead24..6c0d3fb 100644
> --- a/drivers/mmc/host/Makefile
> +++ b/drivers/mmc/host/Makefile
> @@ -11,7 +11,8 @@ 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-arasan.o
> +sdhci-pci-y += sdhci-pci-core.o sdhci-pci-o2micro.o
> sdhci-pci-arasan.o \
> + sdhci-pci-dwc-mshc.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 77dd352..96b6963 100644
> --- a/drivers/mmc/host/sdhci-pci-core.c
> +++ b/drivers/mmc/host/sdhci-pci-core.c
> @@ -1511,6 +1511,7 @@ static int amd_probe(struct sdhci_pci_chip *chip)
> SDHCI_PCI_DEVICE(O2, SEABIRD0, o2),
> SDHCI_PCI_DEVICE(O2, SEABIRD1, o2),
> SDHCI_PCI_DEVICE(ARASAN, PHY_EMMC, arasan),
> + SDHCI_PCI_DEVICE(SYNOPSYS, DWC_MSHC, snps),
> 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-dwc-mshc.c
> b/drivers/mmc/host/sdhci-pci-dwc-mshc.c
> new file mode 100644
> index 0000000..bca3db4
> --- /dev/null
> +++ b/drivers/mmc/host/sdhci-pci-dwc-mshc.c
> @@ -0,0 +1,146 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * SDHCI driver for Synopsys DWC_MSHC controller
> + *
> + * Copyright (C) 2018 Synopsys, Inc. (www.synopsys.com)
> + *
> + * Authors:
> + * Prabu Thangamuthu <prabu.t@...opsys.com>
> + * Manjunath M B <manjumb@...opsys.com>
> + *
> + */
> +
> +#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-mshc.h"
> +
> +/* Default emmc vdd is set to 3.3V */
> +static unsigned int emmc_vdd = SDHC_EMMC_VDD_330V;
> +module_param(emmc_vdd, int, 0444);
Why a module parameter?
> +
> +static 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*/
Space between MMCM and *
> + 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*/
Space between MMCM and *
> + 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);
> + }
> +}
> +
> +static 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);
> + }
> +}
> +
> +static 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);
Why read caps here?
> +
> + 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_set_bus_width,
> + .reset = sdhci_reset,
> + .set_uhs_signaling = sdhci_set_uhs_signaling,
> +};
> +
> +const struct sdhci_pci_fixes sdhci_snps = {
> + .probe_slot = sdhci_snps_pci_probe_slot,
> + .ops = &sdhci_snps_ops,
> +};
> +
> +MODULE_PARM_DESC(emmc_vdd, "VDD to configure eMMC device supply voltage");
> diff --git a/drivers/mmc/host/sdhci-pci-dwc-mshc.h
> b/drivers/mmc/host/sdhci-pci-dwc-mshc.h
> new file mode 100644
> index 0000000..352bbfd
> --- /dev/null
> +++ b/drivers/mmc/host/sdhci-pci-dwc-mshc.h
Please put the definitions into sdhci-pci-dwc-mshc.c and then this file is
not needed.
> @@ -0,0 +1,37 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * SDHCI driver for Synopsys DWC_MSHC controller
> + *
> + * Copyright (C) 2018 Synopsys, Inc. (www.synopsys.com)
> + *
> + * Authors:
> + * Prabu Thangamuthu <prabu.t@...opsys.com>
> + * Manjunath M B <manjumb@...opsys.com>
> + *
> + */
> +
> +#ifndef __SDHCI_PCI_DWC_MSHC_H__
> +#define __SDHCI_PCI_DWC_MSHC_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
> +
> +#endif
> diff --git a/drivers/mmc/host/sdhci-pci.h b/drivers/mmc/host/sdhci-pci.h
> index db9cb54..c91dcec 100644
> --- a/drivers/mmc/host/sdhci-pci.h
> +++ b/drivers/mmc/host/sdhci-pci.h
> @@ -59,6 +59,7 @@
> #define PCI_VENDOR_ID_ARASAN 0x16e6
> #define PCI_DEVICE_ID_ARASAN_PHY_EMMC 0x0670
>
> +#define PCI_DEVICE_ID_SYNOPSYS_DWC_MSHC 0xC202
> /*
> * PCI device class and mask
> */
> @@ -183,4 +184,6 @@ static inline void *sdhci_pci_priv(struct
> sdhci_pci_slot *slot)
>
> extern const struct sdhci_pci_fixes sdhci_arasan;
>
> +extern const struct sdhci_pci_fixes sdhci_snps;
> +
> #endif /* __SDHCI_PCI_H */
>
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