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SubjectRe: [PATCH V8 5/5] mmc: host: sdhci-pci: Add Genesys Logic GL975x support
On Wed, Sep 11, 2019 at 12:42 PM Guenter Roeck <linux@roeck-us.net> wrote:
>
> On Fri, Sep 06, 2019 at 10:33:26AM +0800, Ben Chuang wrote:
> > From: Ben Chuang <ben.chuang@genesyslogic.com.tw>
> >
> > Add support for the GL9750 and GL9755 chipsets.
> >
> > Enable v4 mode and wait 5ms after set 1.8V signal enable for GL9750/
> > GL9755. Fix the value of SDHCI_MAX_CURRENT register and use the vendor
> > tuning flow for GL9750.
> >
> > Co-developed-by: Michael K Johnson <johnsonm@danlj.org>
> > Signed-off-by: Michael K Johnson <johnsonm@danlj.org>
> > Signed-off-by: Ben Chuang <ben.chuang@genesyslogic.com.tw>
> > ---
> > drivers/mmc/host/Kconfig | 1 +
> > drivers/mmc/host/Makefile | 2 +-
> > drivers/mmc/host/sdhci-pci-core.c | 2 +
> > drivers/mmc/host/sdhci-pci-gli.c | 355 ++++++++++++++++++++++++++++++
> > drivers/mmc/host/sdhci-pci.h | 5 +
> > 5 files changed, 364 insertions(+), 1 deletion(-)
> > create mode 100644 drivers/mmc/host/sdhci-pci-gli.c
> >
> > diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> > index 931770f17087..9fbfff514d6c 100644
> > --- a/drivers/mmc/host/Kconfig
> > +++ b/drivers/mmc/host/Kconfig
> > @@ -94,6 +94,7 @@ config MMC_SDHCI_PCI
> > depends on MMC_SDHCI && PCI
> > select MMC_CQHCI
> > select IOSF_MBI if X86
> > + select MMC_SDHCI_IO_ACCESSORS
> > help
> > This selects the PCI Secure Digital Host Controller Interface.
> > Most controllers found today are PCI devices.
> > 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..94462b94abec
> > --- /dev/null
> > +++ b/drivers/mmc/host/sdhci-pci-gli.c
> > @@ -0,0 +1,355 @@
> > +// 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/bitfield.h>
> > +#include <linux/bits.h>
> > +#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_WT_EN BIT(0)
> > +#define GLI_9750_WT_EN_ON 0x1
> > +#define GLI_9750_WT_EN_OFF 0x0
> > +
> > +#define SDHCI_GLI_9750_DRIVING 0x860
> > +#define SDHCI_GLI_9750_DRIVING_1 GENMASK(11, 0)
> > +#define SDHCI_GLI_9750_DRIVING_2 GENMASK(27, 26)
> > +#define GLI_9750_DRIVING_1_VALUE 0xFFF
> > +#define GLI_9750_DRIVING_2_VALUE 0x3
> > +
> > +#define SDHCI_GLI_9750_PLL 0x864
> > +#define SDHCI_GLI_9750_PLL_TX2_INV BIT(23)
> > +#define SDHCI_GLI_9750_PLL_TX2_DLY GENMASK(22, 20)
> > +#define GLI_9750_PLL_TX2_INV_VALUE 0x1
> > +#define GLI_9750_PLL_TX2_DLY_VALUE 0x0
> > +
> > +#define SDHCI_GLI_9750_SW_CTRL 0x874
> > +#define SDHCI_GLI_9750_SW_CTRL_4 GENMASK(7, 6)
> > +#define GLI_9750_SW_CTRL_4_VALUE 0x3
> > +
> > +#define SDHCI_GLI_9750_MISC 0x878
> > +#define SDHCI_GLI_9750_MISC_TX1_INV BIT(2)
> > +#define SDHCI_GLI_9750_MISC_RX_INV BIT(3)
> > +#define SDHCI_GLI_9750_MISC_TX1_DLY GENMASK(6, 4)
> > +#define GLI_9750_MISC_TX1_INV_VALUE 0x0
> > +#define GLI_9750_MISC_RX_INV_ON 0x1
> > +#define GLI_9750_MISC_RX_INV_OFF 0x0
> > +#define GLI_9750_MISC_RX_INV_VALUE GLI_9750_MISC_RX_INV_OFF
> > +#define GLI_9750_MISC_TX1_DLY_VALUE 0x5
> > +
> > +#define SDHCI_GLI_9750_TUNING_CONTROL 0x540
> > +#define SDHCI_GLI_9750_TUNING_CONTROL_EN BIT(4)
> > +#define GLI_9750_TUNING_CONTROL_EN_ON 0x1
> > +#define GLI_9750_TUNING_CONTROL_EN_OFF 0x0
> > +#define SDHCI_GLI_9750_TUNING_CONTROL_GLITCH_1 BIT(16)
> > +#define SDHCI_GLI_9750_TUNING_CONTROL_GLITCH_2 GENMASK(20, 19)
> > +#define GLI_9750_TUNING_CONTROL_GLITCH_1_VALUE 0x1
> > +#define GLI_9750_TUNING_CONTROL_GLITCH_2_VALUE 0x2
> > +
> > +#define SDHCI_GLI_9750_TUNING_PARAMETERS 0x544
> > +#define SDHCI_GLI_9750_TUNING_PARAMETERS_RX_DLY GENMASK(2, 0)
> > +#define GLI_9750_TUNING_PARAMETERS_RX_DLY_VALUE 0x1
> > +
> > +#define GLI_MAX_TUNING_LOOP 40
> > +
> > +/* Genesys Logic chipset */
> > +static inline void gl9750_wt_on(struct sdhci_host *host)
> > +{
> > + u32 wt_value;
> > + u32 wt_enable;
> > +
> > + wt_value = sdhci_readl(host, SDHCI_GLI_9750_WT);
> > + wt_enable = FIELD_GET(SDHCI_GLI_9750_WT_EN, wt_value);
> > +
> > + if (wt_enable == GLI_9750_WT_EN_ON)
> > + return;
> > +
> > + wt_value &= ~SDHCI_GLI_9750_WT_EN;
> > + wt_value |= FIELD_PREP(SDHCI_GLI_9750_WT_EN, GLI_9750_WT_EN_ON);
> > +
> > + sdhci_writel(host, wt_value, SDHCI_GLI_9750_WT);
> > +}
> > +
> > +static inline void gl9750_wt_off(struct sdhci_host *host)
> > +{
> > + u32 wt_value;
> > + u32 wt_enable;
> > +
> > + wt_value = sdhci_readl(host, SDHCI_GLI_9750_WT);
> > + wt_enable = FIELD_GET(SDHCI_GLI_9750_WT_EN, wt_value);
> > +
> > + if (wt_enable == GLI_9750_WT_EN_OFF)
> > + return;
> > +
> > + wt_value &= ~SDHCI_GLI_9750_WT_EN;
> > + wt_value |= FIELD_PREP(SDHCI_GLI_9750_WT_EN, GLI_9750_WT_EN_OFF);
> > +
> > + sdhci_writel(host, wt_value, SDHCI_GLI_9750_WT);
> > +}
> > +
> > +static void gli_set_9750(struct sdhci_host *host)
> > +{
> > + u32 driving_value;
> > + u32 pll_value;
> > + u32 sw_ctrl_value;
> > + u32 misc_value;
> > + u32 parameter_value;
> > + u32 control_value;
> > + u16 ctrl2;
> > +
> > + gl9750_wt_on(host);
> > +
> > + 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 &= ~(SDHCI_GLI_9750_DRIVING_1);
> > + driving_value &= ~(SDHCI_GLI_9750_DRIVING_2);
> > + driving_value |= FIELD_PREP(SDHCI_GLI_9750_DRIVING_1,
> > + GLI_9750_DRIVING_1_VALUE);
> > + driving_value |= FIELD_PREP(SDHCI_GLI_9750_DRIVING_2,
> > + GLI_9750_DRIVING_2_VALUE);
> > + sdhci_writel(host, driving_value, SDHCI_GLI_9750_DRIVING);
> > +
> > + sw_ctrl_value &= ~SDHCI_GLI_9750_SW_CTRL_4;
> > + sw_ctrl_value |= FIELD_PREP(SDHCI_GLI_9750_SW_CTRL_4,
> > + GLI_9750_SW_CTRL_4_VALUE);
> > + sdhci_writel(host, sw_ctrl_value, SDHCI_GLI_9750_SW_CTRL);
> > +
> > + /* reset the tuning flow after reinit and before starting tuning */
> > + pll_value &= ~SDHCI_GLI_9750_PLL_TX2_INV;
> > + pll_value &= ~SDHCI_GLI_9750_PLL_TX2_DLY;
> > + pll_value |= FIELD_PREP(SDHCI_GLI_9750_PLL_TX2_INV,
> > + GLI_9750_PLL_TX2_INV_VALUE);
> > + pll_value |= FIELD_PREP(SDHCI_GLI_9750_PLL_TX2_DLY,
> > + GLI_9750_PLL_TX2_DLY_VALUE);
> > +
> > + misc_value &= ~SDHCI_GLI_9750_MISC_TX1_INV;
> > + misc_value &= ~SDHCI_GLI_9750_MISC_RX_INV;
> > + misc_value &= ~SDHCI_GLI_9750_MISC_TX1_DLY;
> > + misc_value |= FIELD_PREP(SDHCI_GLI_9750_MISC_TX1_INV,
> > + GLI_9750_MISC_TX1_INV_VALUE);
> > + misc_value |= FIELD_PREP(SDHCI_GLI_9750_MISC_RX_INV,
> > + GLI_9750_MISC_RX_INV_VALUE);
> > + misc_value |= FIELD_PREP(SDHCI_GLI_9750_MISC_TX1_DLY,
> > + GLI_9750_MISC_TX1_DLY_VALUE);
> > +
> > + parameter_value &= ~SDHCI_GLI_9750_TUNING_PARAMETERS_RX_DLY;
> > + parameter_value |= FIELD_PREP(SDHCI_GLI_9750_TUNING_PARAMETERS_RX_DLY,
> > + GLI_9750_TUNING_PARAMETERS_RX_DLY_VALUE);
> > +
> > + control_value &= ~SDHCI_GLI_9750_TUNING_CONTROL_GLITCH_1;
> > + control_value &= ~SDHCI_GLI_9750_TUNING_CONTROL_GLITCH_2;
> > + control_value |= FIELD_PREP(SDHCI_GLI_9750_TUNING_CONTROL_GLITCH_1,
> > + GLI_9750_TUNING_CONTROL_GLITCH_1_VALUE);
> > + control_value |= FIELD_PREP(SDHCI_GLI_9750_TUNING_CONTROL_GLITCH_2,
> > + GLI_9750_TUNING_CONTROL_GLITCH_2_VALUE);
> > +
> > + 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);
> > +
> > + /* enable tuning parameters control */
> > + control_value &= ~SDHCI_GLI_9750_TUNING_CONTROL_EN;
> > + control_value |= FIELD_PREP(SDHCI_GLI_9750_TUNING_CONTROL_EN,
> > + GLI_9750_TUNING_CONTROL_EN_ON);
> > + sdhci_writel(host, control_value, SDHCI_GLI_9750_TUNING_CONTROL);
> > +
> > + /* write tuning parameters */
> > + sdhci_writel(host, parameter_value, SDHCI_GLI_9750_TUNING_PARAMETERS);
> > +
> > + /* disable tuning parameters control */
> > + control_value &= ~SDHCI_GLI_9750_TUNING_CONTROL_EN;
> > + control_value |= FIELD_PREP(SDHCI_GLI_9750_TUNING_CONTROL_EN,
> > + GLI_9750_TUNING_CONTROL_EN_OFF);
> > + 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);
> > +
> > + gl9750_wt_off(host);
> > +}
> > +
> > +static void gli_set_9750_rx_inv(struct sdhci_host *host, bool b)
> > +{
> > + u32 misc_value;
> > +
> > + gl9750_wt_on(host);
> > +
> > + misc_value = sdhci_readl(host, SDHCI_GLI_9750_MISC);
> > + if (b) {
> > + misc_value &= ~SDHCI_GLI_9750_MISC_RX_INV;
>
> The above statement can be moved outside the if.
>
You are right. I will do it.

> > + misc_value |= FIELD_PREP(SDHCI_GLI_9750_MISC_RX_INV,
> > + GLI_9750_MISC_RX_INV_ON);
> > + sdhci_writel(host, misc_value, SDHCI_GLI_9750_MISC);
>
> Can be moved outside the if.
>
> [ maybe that was discussed; if so please ignore ]
>

I will do it, it make code short.

> > + } else {
> > + misc_value &= ~SDHCI_GLI_9750_MISC_RX_INV;
> > + misc_value |= FIELD_PREP(SDHCI_GLI_9750_MISC_RX_INV,
> > + GLI_9750_MISC_RX_INV_OFF);
> > + sdhci_writel(host, misc_value, SDHCI_GLI_9750_MISC);
> > + }
> > +
> > + gl9750_wt_off(host);
> > +}
> > +
> > +static int __sdhci_execute_tuning_9750(struct sdhci_host *host, u32 opcode)
> > +{
> > + int i;
> > + int rx_inv;
> > +
> > + for (rx_inv = 0; rx_inv < 2; rx_inv++) {
> > + gli_set_9750_rx_inv(host, !!rx_inv);
> > + sdhci_start_tuning(host);
> > +
> > + for (i = 0; i < GLI_MAX_TUNING_LOOP; i++) {
> > + u16 ctrl;
> > +
> > + sdhci_send_tuning(host, opcode);
> > +
> > + if (!host->tuning_done) {
> > + sdhci_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;
> > + }
> > + }
> > + }
> > + if (!host->tuning_done) {
> > + pr_info("%s: Tuning timeout, falling back to fixed sampling clock\n",
> > + mmc_hostname(host->mmc));
> > + return -ETIMEDOUT;
> > + }
> > +
> > + 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 sdhci_host *host, u32 opcode)
> > +{
> > + host->mmc->retune_period = 0;
> > + if (host->tuning_mode == SDHCI_TUNING_MODE_1)
> > + host->mmc->retune_period = host->tuning_count;
> > +
> > + gli_set_9750(host);
> > + host->tuning_err = __sdhci_execute_tuning_9750(host, opcode);
> > + sdhci_end_tuning(host);
> > +
> > + return 0;
> > +}
> > +
> > +static int gli_probe_slot_gl9750(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 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)
> > +{
> > + /*
> > + * Accroding to Section 3.6.1 signal voltage switch procedure in
>
> According
>
> > + * SD Host Controller Simplified Spec. 4.20, the step 6~8 are the
>
> s/the step/steps/
>
> "as follows", maybe, instead of "the following" ?

I will modify it. Thank you for your comments.

>
> > + * following:
> > + * (6) Set 1.8V Signal Enable in the Host Control 2 register.
> > + * (7) Wait 5ms. 1.8V voltage regulator shall be stable within this
> > + * period.
> > + * (8) If 1.8V Signal Enable is cleared by Host Controller, go to
> > + * step (12).
> > + *
> > + * Wait 5ms after set 1.8V signal enable in Host Control 2 register
> > + * to ensure 1.8V signal enable bit is set by GL9750/GL9755.
> > + */
> > + usleep_range(5000, 5500);
> > +}
> > +
> > +static void sdhci_gl9750_reset(struct sdhci_host *host, u8 mask)
> > +{
> > + sdhci_reset(host, mask);
> > + 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 && !(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_reset,
> > + .set_uhs_signaling = sdhci_set_uhs_signaling,
> > + .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_gl9750_reset,
> > + .set_uhs_signaling = sdhci_set_uhs_signaling,
> > + .voltage_switch = sdhci_gli_voltage_switch,
> > + .platform_execute_tuning = gl9750_execute_tuning,
> > +};
> > +
> > +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 */

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