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Date: Tue, 26 Apr 2016 10:58:45 +0200
From: Ludovic Desroches <ludovic.desroches@...el.com>
To: Prabu Thangamuthu <Prabu.T@...opsys.com>
CC: "Ulf Hansson (ulf.hansson@...aro.org)" <ulf.hansson@...aro.org>,
Adrian Hunter <adrian.hunter@...el.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
"David S. Miller" <davem@...emloft.net>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Kalle Valo <kvalo@...eaurora.org>,
Mauro Carvalho Chehab <mchehab@....samsung.com>,
Guenter Roeck <linux@...ck-us.net>,
Jiri Slaby <jslaby@...e.com>,
Chaotian Jing <chaotian.jing@...iatek.com>,
Andrei Pistirica <andrei.pistirica@...rochip.com>,
Ben Hutchings <ben.hutchings@...ethink.co.uk>,
Joshua Henderson <joshua.henderson@...rochip.com>,
Ludovic Desroches <ludovic.desroches@...el.com>,
Manjunath M Bettegowda <Manjunath.MB@...opsys.com>,
"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] mmc: sdhci-pci: add Support of Synopsys DWC_MSHC IP
On Wed, Apr 20, 2016 at 12:22:59PM +0000, Prabu Thangamuthu wrote:
> 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@...opsys.com>
> ---
> 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@...opsys.com>
> +M: Manjunath M B <manjumb@...opsys.com>
> +L: linux-mmc@...r.kernel.org
> +S: Maintained
> +F: drivers/mmc/host/sdhci-pci-dwc*
> +
> SYSTEM TRACE MODULE CLASS
> M: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> 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@...opsys.com>
> + *
> + * 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;
These variables can't be used uninitialized so no need to initialize
them.
> +
> + 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;
> +
Some variables don't need to be initialized here.
> + /*
> + * 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);
I am not sure about this part. You may simply call sdhci_set_clock() instead of
sdhci_ops->set_clock(). See my latest comment, it is not clear what is
behind set_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;
> +
Some variables don't need initialization here or you can directly assign
the right value: int div = 2, mul = 2, etc.
> + /* 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;
I am lost. sdhci_ops is a kind of backup of the original ops from
pci core. Your sdhci_pci_ops_snps is a copy of ops from pci core
excepting set_clock and finally you update pci core ops with
sdhci_pci_ops_snps.
It seems a bit complex. At the end, unless I have missed something, you
have only changed set_clock from pci ops.
Regards
Ludovic
> +
> + /* 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@...opsys.com>
> + *
> + * 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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