Re: [PATCH V5 4/4] mmc: host: sdhci-pci: Add Genesys Logic GL975x support

From: Adrian Hunter
Date: Wed Aug 21 2019 - 08:30:50 EST

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In reply to: Ben Chuang: "[PATCH V5 4/4] mmc: host: sdhci-pci: Add Genesys Logic GL975x support"
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On 20/08/19 5:07 AM, Ben Chuang wrote:
> From: Ben Chuang <ben.chuang@xxxxxxxxxxxxxxxxxxx>
>
> Add support for the GL9750 and GL9755 chipsets.
>
> The patches enable v4 mode and wait 5ms after set 1.8V signal enable for
> GL9750/GL9755. It fixed the value of SDHCI_MAX_CURRENT register and uses
> the vendor tuning flow for GL9750.
>
> Signed-off-by: Ben Chuang <ben.chuang@xxxxxxxxxxxxxxxxxxx>
> Co-developed-by: Michael K Johnson <johnsonm@xxxxxxxxx>
> Signed-off-by: Michael K Johnson <johnsonm@xxxxxxxxx>
> ---
> drivers/mmc/host/Makefile | 2 +-
> drivers/mmc/host/sdhci-pci-core.c | 2 +
> drivers/mmc/host/sdhci-pci-gli.c | 381 ++++++++++++++++++++++++++++++
> drivers/mmc/host/sdhci-pci.h | 5 +
> 4 files changed, 389 insertions(+), 1 deletion(-)
> create mode 100644 drivers/mmc/host/sdhci-pci-gli.c
>
> 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..99abb7830e62
> --- /dev/null
> +++ b/drivers/mmc/host/sdhci-pci-gli.c
> @@ -0,0 +1,381 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2019 Genesys Logic, Inc.
> + *
> + * Authors: Ben Chuang <ben.chuang@xxxxxxxxxxxxxxxxxxx>
> + *
> + * Version: v0.9.0 (2019-08-08)
> + */
> +
> +#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_DRIVING 0x860
> +#define SDHCI_GLI_9750_PLL 0x864
> +#define SDHCI_GLI_9750_SW_CTRL 0x874
> +#define SDHCI_GLI_9750_MISC 0x878
> +
> +#define SDHCI_GLI_9750_TUNING_CONTROL 0x540
> +#define SDHCI_GLI_9750_TUNING_PARAMETERS 0x544
> +
> +#define GLI_MAX_TUNING_LOOP 40
> +
> +/* Genesys Logic chipset */
> +static void gli_set_9750(struct sdhci_host *host)
> +{
> + u32 wt_value = 0;
> + u32 driving_value = 0;
> + u32 pll_value = 0;
> + u32 sw_ctrl_value = 0;
> + u32 misc_value = 0;
> + u32 parameter_value = 0;
> + u32 control_value = 0;
> +
> + u16 ctrl2 = 0;
> +
> + wt_value = sdhci_readl(host, SDHCI_GLI_9750_WT);
> + if ((wt_value & 0x1) == 0) {
> + wt_value |= 0x1;
> + sdhci_writel(host, wt_value, SDHCI_GLI_9750_WT);
> + }
> +
> + 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 &= ~(0x0C000FFF);
> + driving_value |= 0x0C000FFF;
> + sdhci_writel(host, driving_value, SDHCI_GLI_9750_DRIVING);
> +
> + sw_ctrl_value |= 0xc0;
> + sdhci_writel(host, sw_ctrl_value, SDHCI_GLI_9750_SW_CTRL);
> +
> + // reset the tuning flow after reinit and before starting tuning

For consistent style, please use C-style comments /* */ rather than //

> + pll_value |= 0x800000; // bit23-1

Please define bit fields and look at using GENMASK(), BIT(), FIELD_GET(),
FIELD_PREP()

> + pll_value &= ~(0x00700000); // bit22:20-0
> +
> + misc_value &= ~(0x8); // bit3-0
> + misc_value &= ~(0x4); // bit2-0
> +
> + misc_value &= ~(0x70); // bit6:4-0
> + misc_value |= 0x50; // bit6:4-5
> +
> + parameter_value &= ~(0x7); // bit2:0-0
> + parameter_value |= 0x1; // bit2:0-1
> +
> + control_value &= ~(0x190000); // bit20:19-0, bit16-0
> + control_value |= 0x110000; // bit20:19-b10, bit16-1
> +
> + 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);
> +
> + // 540 enable tuning parameters control
> + control_value |= 0x10;
> + sdhci_writel(host, control_value, SDHCI_GLI_9750_TUNING_CONTROL);
> +
> + // write 544 tuning parameters
> + sdhci_writel(host, parameter_value, SDHCI_GLI_9750_TUNING_PARAMETERS);
> +
> + // 540 disable tuning parameters control
> + control_value &= ~0x10;
> + 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);
> +
> + udelay(1);
> + wt_value = sdhci_readl(host, SDHCI_GLI_9750_WT);
> + wt_value &= ~0x1;
> + sdhci_writel(host, wt_value, SDHCI_GLI_9750_WT);
> +}
> +
> +static void sdhci_gli_do_reset(struct sdhci_host *host, u8 mask)
> +{
> + host->ops->reset(host, mask);
> +
> + if (mask & SDHCI_RESET_ALL) {
> + if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
> + if (host->ops->enable_dma)
> + host->ops->enable_dma(host);
> + }
> +
> + /* Resetting the controller clears many */
> + host->preset_enabled = false;
> + }
> +}
> +
> +static void sdhci_gli_abort_tuning(struct sdhci_host *host, u32 opcode)

Pleased export sdhci_abort_tuning() instead.

> +{
> + sdhci_reset_tuning(host);
> +
> + sdhci_gli_do_reset(host, SDHCI_RESET_CMD);
> + sdhci_gli_do_reset(host, SDHCI_RESET_DATA);
> +
> + sdhci_end_tuning(host);
> +
> + mmc_abort_tuning(host->mmc, opcode);
> +}
> +
> +static void gli_set_9750_rx_inv(struct sdhci_host *host, bool b)
> +{
> + u32 wt_value = sdhci_readl(host, SDHCI_GLI_9750_WT);
> + u32 misc_value = sdhci_readl(host, SDHCI_GLI_9750_MISC);
> +
> + if ((wt_value & 0x1) == 0) {
> + wt_value |= 0x1;
> + sdhci_writel(host, wt_value, SDHCI_GLI_9750_WT);
> + }
> +
> + misc_value = sdhci_readl(host, SDHCI_GLI_9750_MISC);
> + if (b) {
> + misc_value |= 0x8;
> + sdhci_writel(host, misc_value, SDHCI_GLI_9750_MISC);
> + } else {
> + misc_value &= ~0x8;
> + sdhci_writel(host, misc_value, SDHCI_GLI_9750_MISC);
> + }
> +
> + wt_value = sdhci_readl(host, SDHCI_GLI_9750_WT);
> + wt_value &= ~0x1;
> + sdhci_writel(host, wt_value, SDHCI_GLI_9750_WT);
> +}
> +
> +static int __sdhci_execute_tuning_9750(struct sdhci_host *host, u32 opcode)
> +{
> + int i;
> + int rx_inv = 0;
> +
> + for (rx_inv = 0; rx_inv < 2; rx_inv++) {
> + if (rx_inv & 0x1)
> + gli_set_9750_rx_inv(host, true);
> + else
> + gli_set_9750_rx_inv(host, false);
> +
> + sdhci_start_tuning(host);
> +
> + for (i = 0; i < GLI_MAX_TUNING_LOOP; i++) {
> + u16 ctrl;
> +
> + sdhci_send_tuning(host, opcode);
> +
> + if (!host->tuning_done) {
> + if (rx_inv == 1) {
> + pr_info("%s: Tuning timeout, falling back to fixed sampling clock\n",
> + mmc_hostname(host->mmc));
> + sdhci_gli_abort_tuning(host, opcode);
> + return -ETIMEDOUT;
> + }
> + pr_info("%s: Tuning timeout, try next tuning\n",
> + mmc_hostname(host->mmc));
> + sdhci_gli_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;
> + }
> + }
> + }
> +
> + 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 mmc_host *mmc, u32 opcode)
> +{
> + struct sdhci_host *host = mmc_priv(mmc);
> + int err = 0;
> + unsigned int tuning_count = 0;
> + bool hs400_tuning;
> +
> + hs400_tuning = host->flags & SDHCI_HS400_TUNING;
> +
> + if (host->tuning_mode == SDHCI_TUNING_MODE_1)
> + tuning_count = host->tuning_count;
> +
> + /*
> + * The Host Controller needs tuning in case of SDR104 and DDR50
> + * mode, and for SDR50 mode when Use Tuning for SDR50 is set in
> + * the Capabilities register.
> + * If the Host Controller supports the HS200 mode then the
> + * tuning function has to be executed.
> + */
> + switch (host->timing) {
> + /* HS400 tuning is done in HS200 mode */
> + case MMC_TIMING_MMC_HS400:
> + err = -EINVAL;
> + goto out;
> +
> + case MMC_TIMING_MMC_HS200:
> + /*
> + * Periodic re-tuning for HS400 is not expected to be needed, so
> + * disable it here.
> + */
> + if (hs400_tuning)
> + tuning_count = 0;
> + break;
> +
> + case MMC_TIMING_UHS_SDR104:
> + case MMC_TIMING_UHS_DDR50:
> + break;
> + case MMC_TIMING_UHS_SDR50:
> + if (host->flags & SDHCI_SDR50_NEEDS_TUNING)
> + break;
> + /* FALLTHROUGH */
> +
> + default:
> + goto out;
> + }
> +
> + if (host->ops->platform_execute_tuning) {
> + err = host->ops->platform_execute_tuning(host, opcode);
> + goto out;
> + }
> +
> + host->mmc->retune_period = tuning_count;
> +
> + if (host->tuning_delay < 0)
> + host->tuning_delay = opcode == MMC_SEND_TUNING_BLOCK;
> +
> + gli_set_9750(host);
> + host->tuning_err = __sdhci_execute_tuning_9750(host, opcode);
> +
> + sdhci_end_tuning(host);
> +out:
> + host->flags &= ~SDHCI_HS400_TUNING;
> +
> + return err;
> +}
> +
> +static int gli_probe_slot_gl9750(struct sdhci_pci_slot *slot)
> +{
> + struct sdhci_host *host = slot->host;
> + struct mmc_host_ops *ops = &host->mmc_host_ops;
> +
> + slot->host->mmc->caps2 |= MMC_CAP2_NO_SDIO;
> + sdhci_enable_v4_mode(host);
> +
> + ops->execute_tuning = gl9750_execute_tuning;

It looks like there would be less duplicated code if you implemented
host->ops->platform_execute_tuning instead of mmc->ops->execute_tuning

> +
> + 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)
> +{
> + usleep_range(5000, 5500);
> +}
> +
> +static void sdhci_gli_pci_hw_reset(struct sdhci_host *host)
> +{
> + struct sdhci_pci_slot *slot = sdhci_priv(host);
> +
> + if (slot->hw_reset)
> + slot->hw_reset(host);
> +}
> +
> +static void sdhci_gl9750_reset(struct sdhci_host *host, u8 mask)
> +{
> + ktime_t timeout;
> +
> + sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
> +
> + if (mask & SDHCI_RESET_ALL)
> + host->clock = 0;
> +
> + /* Wait max 100 ms */
> + timeout = ktime_add_ms(ktime_get(), 100);
> +
> + /* hw clears the bit when it's done */
> + while (1) {
> + bool timedout = ktime_after(ktime_get(), timeout);
> +
> + if (!(sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask))
> + break;
> + if (timedout) {
> + pr_err("%s: Reset 0x%x never completed.\n",
> + mmc_hostname(host->mmc), (int)mask);
> + sdhci_dumpregs(host);
> + return;
> + }
> + udelay(10);
> + }

Please call sdhci_reset() instead of duplicating the code above.

> + 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)) {
> + if (!(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,
> + .hw_reset = sdhci_gli_pci_hw_reset,

You never set slot->hw_reset so it doesn't look like .hw_reset is needed

> + .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,

You need CONFIG_MMC_SDHCI_IO_ACCESSORS for read_l i.e.

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index 14d89a108edd..c3bd967d8a1a 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.

> + .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,
> + .hw_reset = sdhci_gli_pci_hw_reset,
> + .voltage_switch = sdhci_gli_voltage_switch,
> +};
> +
> +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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