Re: [PATCH 17/21] ata: ahci: Add DWC AHCI SATA controller support

From: Damien Le Moal
Date: Wed Mar 23 2022 - 22:21:19 EST

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On 3/24/22 09:16, Serge Semin wrote:
> Synopsys AHCI SATA controller can work pretty under with the generic
> AHCI-platform driver control. But there are vendor-specific peculiarities
> which can tune the device performance up and which may need to be fixed up
> for proper device functioning. In addition some DWC AHCI-based controllers
> may require small platform-specific fixups, so adding them in the generic
> AHCI driver would have ruined the code simplicity. Shortly speaking in
> order to keep the generic AHCI-platform code clean and have DWC AHCI
> SATA-specific features supported we suggest to add a dedicated DWC AHCI
> SATA device driver. Aside with the standard AHCI-platform resources
> getting, enabling/disabling and the controller registration the new driver
> performs the next actions.
>
> First of all there is a way to verify whether the HBA/ports capabilities
> activated in OF are correct. Almost all features availability is reflected
> in the vendor-specific parameters registers. So the DWC AHCI driver does
> the capabilities sanity check based on the corresponding fields state.
>
> Secondly if either the Command Completion Coalescing or the Device Sleep
> feature is enabled the DWC AHCI-specific internal 1ms timer must be fixed
> in accordance with the application clock signal frequency. In particular
> the timer value must be set to be Fapp * 1000. Normally the SoC designers
> pre-configure the TIMER1MS register to contain a correct value by default.
> But the platforms can support the application clock rate change. If that
> happens the 1ms timer value must be accordingly updated otherwise the
> dependent features won't work as expected. In the DWC AHCI driver we
> suggest to rely on the "aclk" reference clock rate to set the timer
> interval up. That clock source is supposed to be the AHCI SATA application
> clock in accordance with the DT bindings.
>
> Finally DWC AHCI SATA controller AXI/AHB bus DMA-engine can be tuned up to
> transfer up to 1024 * FIFO words at a time by setting the Tx/Rx
> transaction size in the DMA control register. The maximum value depends on
> the DMA data bus and AXI/AHB bus maximum burst length. In most of the
> cases it's better to set the maximum possible value to reach the best AHCI
> SATA controller performance. But sometimes in order to improve the system
> interconnect responsiveness, transferring in smaller data chunks may be
> more preferable. For such cases and for the case when the default value
> doesn't provide the best DMA bus performance we suggest to use the new
> HBA-port specific DT-properties "snps,{tx,rx}-ts-max" to tune the DMA
> transactions size up.
>
> After all the settings denoted above are handled the DWC AHCI SATA driver
> proceeds further with the standard AHCI-platform host initializations.
>
> Note since DWC AHCI controller is now have a dedicated driver we can
> discard the corresponding compatible string from the ahci-platform.c
> module. The same concerns "snps,spear-ahci" compatible string, which is
> also based on the DWC AHCI IP-core.
>
> Signed-off-by: Serge Semin <Sergey.Semin@xxxxxxxxxxxxxxxxxxxx>
>
> ---
>
> Note there are three more AHCI SATA drivers which have been created for
> the devices based on the DWC AHCI SATA IP-core. It's AHCI SunXi, St and
> iMX drivers. Mostly they don't support the features implemented in this
> driver. So hopefully sometime in future they can be converted to be based
> on the generic DWC AHCI SATA driver and just perform some
> subvendor-specific setups in their own glue-driver code. But for now
> let's leave the generic DWC AHCI SATA code as is. Hopefully the new DWC
> AHCI-based device drivers will try at least to re-use a part of the DWC
> AHCI driver methods if not being able to be integrated in the generic
> DWC driver code.
> ---
> drivers/ata/Kconfig | 10 +
> drivers/ata/Makefile | 1 +
> drivers/ata/ahci_dwc.c | 395 ++++++++++++++++++++++++++++++++++++
> drivers/ata/ahci_platform.c | 2 -
> 4 files changed, 406 insertions(+), 2 deletions(-)
> create mode 100644 drivers/ata/ahci_dwc.c
>
> diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
> index cb54631fd950..ab11bcf8510c 100644
> --- a/drivers/ata/Kconfig
> +++ b/drivers/ata/Kconfig
> @@ -174,6 +174,16 @@ config AHCI_DM816
>
> If unsure, say N.
>
> +config AHCI_DWC
> + tristate "Synopsys DWC AHCI SATA support"
> + select SATA_HOST
> + default SATA_AHCI_PLATFORM
> + help
> + This option enables support for the Synopsys DWC AHCI SATA
> + controller implementation.
> +
> + If unsure, say N.
> +
> config AHCI_ST
> tristate "ST AHCI SATA support"
> depends on ARCH_STI
> diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
> index b8aebfb14e82..34623365d9a6 100644
> --- a/drivers/ata/Makefile
> +++ b/drivers/ata/Makefile
> @@ -17,6 +17,7 @@ obj-$(CONFIG_AHCI_BRCM) += ahci_brcm.o libahci.o libahci_platform.o
> obj-$(CONFIG_AHCI_CEVA) += ahci_ceva.o libahci.o libahci_platform.o
> obj-$(CONFIG_AHCI_DA850) += ahci_da850.o libahci.o libahci_platform.o
> obj-$(CONFIG_AHCI_DM816) += ahci_dm816.o libahci.o libahci_platform.o
> +obj-$(CONFIG_AHCI_DWC) += ahci_dwc.o libahci.o libahci_platform.o
> obj-$(CONFIG_AHCI_IMX) += ahci_imx.o libahci.o libahci_platform.o
> obj-$(CONFIG_AHCI_MTK) += ahci_mtk.o libahci.o libahci_platform.o
> obj-$(CONFIG_AHCI_MVEBU) += ahci_mvebu.o libahci.o libahci_platform.o
> diff --git a/drivers/ata/ahci_dwc.c b/drivers/ata/ahci_dwc.c
> new file mode 100644
> index 000000000000..c51e2251994e
> --- /dev/null
> +++ b/drivers/ata/ahci_dwc.c
> @@ -0,0 +1,395 @@
> +// SPDX-License-Identifier: GPL-2.0-or-later
> +/*
> + * DWC AHCI SATA Platform driver
> + *
> + * Copyright (C) 2021 BAIKAL ELECTRONICS, JSC
> + */
> +
> +#include <linux/ahci_platform.h>
> +#include <linux/bitfield.h>
> +#include <linux/bits.h>
> +#include <linux/clk.h>
> +#include <linux/device.h>
> +#include <linux/kernel.h>
> +#include <linux/libata.h>
> +#include <linux/log2.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm.h>
> +
> +#include "ahci.h"
> +
> +#define DRV_NAME "ahci-dwc"
> +
> +#define DWC_AHCI_FBS_PMPN_MAX 15

The convention is to name things starting with AHCI, e.g. AHCI_DWC_xxxx

> +
> +/* DWC AHCI SATA controller specific registers */
> +#define DWC_AHCI_HOST_OOBR 0xbc
> +#define DWC_AHCI_HOST_OOB_WE BIT(31)
> +#define DWC_AHCI_HOST_CWMIN_MASK GENMASK(30, 24)
> +#define DWC_AHCI_HOST_CWMAX_MASK GENMASK(23, 16)
> +#define DWC_AHCI_HOST_CIMIN_MASK GENMASK(15, 8)
> +#define DWC_AHCI_HOST_CIMAX_MASK GENMASK(7, 0)
> +
> +#define DWC_AHCI_HOST_GPCR 0xd0
> +#define DWC_AHCI_HOST_GPSR 0xd4
> +
> +#define DWC_AHCI_HOST_TIMER1MS 0xe0
> +#define DWC_AHCI_HOST_TIMV_MASK GENMASK(19, 0)
> +
> +#define DWC_AHCI_HOST_GPARAM1R 0xe8
> +#define DWC_AHCI_HOST_ALIGN_M BIT(31)
> +#define DWC_AHCI_HOST_RX_BUFFER BIT(30)
> +#define DWC_AHCI_HOST_PHY_DATA_MASK GENMASK(29, 28)
> +#define DWC_AHCI_HOST_PHY_RST BIT(27)
> +#define DWC_AHCI_HOST_PHY_CTRL_MASK GENMASK(26, 21)
> +#define DWC_AHCI_HOST_PHY_STAT_MASK GENMASK(20, 15)
> +#define DWC_AHCI_HOST_LATCH_M BIT(14)
> +#define DWC_AHCI_HOST_PHY_TYPE_MASK GENMASK(13, 11)
> +#define DWC_AHCI_HOST_RET_ERR BIT(10)
> +#define DWC_AHCI_HOST_AHB_ENDIAN_MASK GENMASK(9, 8)
> +#define DWC_AHCI_HOST_S_HADDR BIT(7)
> +#define DWC_AHCI_HOST_M_HADDR BIT(6)
> +#define DWC_AHCI_HOST_S_HDATA_MASK GENMASK(5, 3)
> +#define DWC_AHCI_HOST_M_HDATA_MASK GENMASK(2, 0)
> +
> +#define DWC_AHCI_HOST_GPARAM2R 0xec
> +#define DWC_AHCI_HOST_FBS_MEM_S BIT(19)
> +#define DWC_AHCI_HOST_FBS_PMPN_MASK GENMASK(17, 16)
> +#define DWC_AHCI_HOST_FBS_SUP BIT(15)
> +#define DWC_AHCI_HOST_DEV_CP BIT(14)
> +#define DWC_AHCI_HOST_DEV_MP BIT(13)
> +#define DWC_AHCI_HOST_ENCODE_M BIT(12)
> +#define DWC_AHCI_HOST_RXOOB_CLK_M BIT(11)
> +#define DWC_AHCI_HOST_RXOOB_M BIT(10)
> +#define DWC_AHCI_HOST_TXOOB_M BIT(9)
> +#define DWC_AHCI_HOST_RXOOB_M BIT(10)
> +#define DWC_AHCI_HOST_RXOOB_CLK_MASK GENMASK(8, 0)
> +
> +#define DWC_AHCI_HOST_PPARAMR 0xf0
> +#define DWC_AHCI_HOST_TX_MEM_M BIT(11)
> +#define DWC_AHCI_HOST_TX_MEM_S BIT(10)
> +#define DWC_AHCI_HOST_RX_MEM_M BIT(9)
> +#define DWC_AHCI_HOST_RX_MEM_S BIT(8)
> +#define DWC_AHCI_HOST_TXFIFO_DEPTH GENMASK(7, 4)
> +#define DWC_AHCI_HOST_RXFIFO_DEPTH GENMASK(3, 0)
> +
> +#define DWC_AHCI_HOST_TESTR 0xf4
> +#define DWC_AHCI_HOST_PSEL_MASK GENMASK(18, 16)
> +#define DWC_AHCI_HOST_TEST_IF BIT(0)
> +
> +#define DWC_AHCI_HOST_VERSIONR 0xf8
> +#define DWC_AHCI_HOST_IDR 0xfc
> +
> +#define DWC_AHCI_PORT_DMACR 0x70
> +#define DWC_AHCI_PORT_RXABL_MASK GENMASK(15, 12)
> +#define DWC_AHCI_PORT_TXABL_MASK GENMASK(11, 8)
> +#define DWC_AHCI_PORT_RXTS_MASK GENMASK(7, 4)
> +#define DWC_AHCI_PORT_TXTS_MASK GENMASK(3, 0)
> +#define DWC_AHCI_PORT_PHYCR 0x74
> +#define DWC_AHCI_PORT_PHYSR 0x78
> +
> +struct dwc_ahci_host_priv {
> + struct platform_device *pdev;
> +
> + u32 timv;
> + u32 dmacr[AHCI_MAX_PORTS];
> +};
> +
> +static struct ahci_host_priv *dwc_ahci_get_resources(struct platform_device *pdev)

Same: dwc_ahci_get_resources() -> ahci_dwc_get_resources()

> +{
> + struct dwc_ahci_host_priv *dpriv;
> + struct ahci_host_priv *hpriv;
> +
> + dpriv = devm_kzalloc(&pdev->dev, sizeof(*dpriv), GFP_KERNEL);
> + if (!dpriv)
> + return ERR_PTR(-ENOMEM);
> +
> + dpriv->pdev = pdev;
> +
> + hpriv = ahci_platform_get_resources(pdev, AHCI_PLATFORM_GET_RESETS);
> + if (IS_ERR(hpriv))
> + return hpriv;
> +
> + hpriv->plat_data = (void *)dpriv;
> +
> + return hpriv;
> +}
> +
> +static void dwc_ahci_check_cap(struct ahci_host_priv *hpriv)
> +{
> + unsigned long port_map = hpriv->saved_port_map | hpriv->mask_port_map;
> + struct dwc_ahci_host_priv *dpriv = hpriv->plat_data;
> + bool dev_mp, dev_cp, fbs_sup;
> + unsigned int fbs_pmp;
> + u32 param;
> + int i;
> +
> + param = readl(hpriv->mmio + DWC_AHCI_HOST_GPARAM2R);
> + dev_mp = !!(param & DWC_AHCI_HOST_DEV_MP);
> + dev_cp = !!(param & DWC_AHCI_HOST_DEV_CP);
> + fbs_sup = !!(param & DWC_AHCI_HOST_FBS_SUP);
> + fbs_pmp = 5 * FIELD_GET(DWC_AHCI_HOST_FBS_PMPN_MASK, param);
> +
> + if (!dev_mp && hpriv->saved_cap & HOST_CAP_MPS) {
> + dev_warn(&dpriv->pdev->dev, "MPS is unsupported\n");
> + hpriv->saved_cap &= ~HOST_CAP_MPS;
> + }
> +
> +
> + if (fbs_sup && fbs_pmp < DWC_AHCI_FBS_PMPN_MAX) {
> + dev_warn(&dpriv->pdev->dev, "PMPn is limited up to %u ports\n",
> + fbs_pmp);
> + }
> +
> + for_each_set_bit(i, &port_map, AHCI_MAX_PORTS) {
> + if (!dev_mp && hpriv->saved_port_cap[i] & PORT_CMD_MPSP) {
> + dev_warn(&dpriv->pdev->dev, "MPS incapable port %d\n", i);
> + hpriv->saved_port_cap[i] &= ~PORT_CMD_MPSP;
> + }
> +
> + if (!dev_cp && hpriv->saved_port_cap[i] & PORT_CMD_CPD) {
> + dev_warn(&dpriv->pdev->dev, "CPD incapable port %d\n", i);
> + hpriv->saved_port_cap[i] &= ~PORT_CMD_CPD;
> + }
> +
> + if (!fbs_sup && hpriv->saved_port_cap[i] & PORT_CMD_FBSCP) {
> + dev_warn(&dpriv->pdev->dev, "FBS incapable port %d\n", i);
> + hpriv->saved_port_cap[i] &= ~PORT_CMD_FBSCP;
> + }
> + }
> +}
> +
> +static void dwc_ahci_init_timer(struct ahci_host_priv *hpriv)
> +{
> + struct dwc_ahci_host_priv *dpriv = hpriv->plat_data;
> + unsigned long rate;
> + struct clk *aclk;
> + u32 cap, cap2;
> +
> + /* 1ms tick is generated only for the CCC or DevSleep features */
> + cap = readl(hpriv->mmio + HOST_CAP);
> + cap2 = readl(hpriv->mmio + HOST_CAP2);
> + if (!(cap & HOST_CAP_CCC) && !(cap2 & HOST_CAP2_SDS))
> + return;
> +
> + /*
> + * Tick is generated based on the AXI/AHB application clocks signal
> + * so we need to be sure in the clock we are going to use.
> + */
> + aclk = ahci_platform_find_clk(hpriv, "aclk");
> + if (!aclk)
> + return;
> +
> + /* 1ms timer interval is set as TIMV = AMBA_FREQ[MHZ] * 1000 */
> + dpriv->timv = readl(hpriv->mmio + DWC_AHCI_HOST_TIMER1MS);
> + dpriv->timv = FIELD_GET(DWC_AHCI_HOST_TIMV_MASK, dpriv->timv);
> + rate = clk_get_rate(aclk) / 1000UL;
> + if (rate == dpriv->timv)
> + return;
> +
> + dev_info(&dpriv->pdev->dev, "Update CCC/DevSlp timer for Fapp %lu MHz\n",
> + rate / 1000UL);
> + dpriv->timv = FIELD_PREP(DWC_AHCI_HOST_TIMV_MASK, rate);
> + writel(dpriv->timv, hpriv->mmio + DWC_AHCI_HOST_TIMER1MS);
> +}
> +
> +static int dwc_ahci_init_dmacr(struct ahci_host_priv *hpriv)
> +{
> + struct dwc_ahci_host_priv *dpriv = hpriv->plat_data;
> + struct device_node *child;
> + void __iomem *port_mmio;
> + u32 port, dmacr, ts;
> +
> + /*
> + * Update the DMA Tx/Rx transaction sizes in accordance with the
> + * platform setup. Note values exceeding maximal or minimal limits will
> + * be automatically clamped. Also note the register isn't affected by
> + * the HBA global reset so we can freely initialize it once until the
> + * next system reset.
> + */
> + for_each_child_of_node(dpriv->pdev->dev.of_node, child) {
> + if (!of_device_is_available(child))
> + continue;
> +
> + if (of_property_read_u32(child, "reg", &port)) {
> + of_node_put(child);
> + return -EINVAL;
> + }
> +
> + port_mmio = __ahci_port_base(hpriv, port);
> + dmacr = readl(port_mmio + DWC_AHCI_PORT_DMACR);
> +
> + if (!of_property_read_u32(child, "snps,tx-ts-max", &ts)) {
> + ts = ilog2(ts);
> + dmacr &= ~DWC_AHCI_PORT_TXTS_MASK;
> + dmacr |= FIELD_PREP(DWC_AHCI_PORT_TXTS_MASK, ts);
> + }
> +
> + if (!of_property_read_u32(child, "snps,rx-ts-max", &ts)) {
> + ts = ilog2(ts);
> + dmacr &= ~DWC_AHCI_PORT_RXTS_MASK;
> + dmacr |= FIELD_PREP(DWC_AHCI_PORT_RXTS_MASK, ts);
> + }
> +
> + writel(dmacr, port_mmio + DWC_AHCI_PORT_DMACR);
> + dpriv->dmacr[port] = dmacr;
> + }
> +
> + return 0;
> +}
> +
> +static int dwc_ahci_init_host(struct ahci_host_priv *hpriv)
> +{
> + int rc;
> +
> + rc = ahci_platform_enable_resources(hpriv);
> + if (rc)
> + return rc;
> +
> + dwc_ahci_check_cap(hpriv);
> +
> + dwc_ahci_init_timer(hpriv);
> +
> + rc = dwc_ahci_init_dmacr(hpriv);
> + if (rc)
> + goto err_disable_resources;
> +
> + return 0;
> +
> +err_disable_resources:
> + ahci_platform_disable_resources(hpriv);
> +
> + return rc;
> +}
> +
> +static int dwc_ahci_reinit_host(struct ahci_host_priv *hpriv)
> +{
> + struct dwc_ahci_host_priv *dpriv = hpriv->plat_data;
> + unsigned long port_map = hpriv->port_map;
> + void __iomem *port_mmio;
> + int i, rc;
> +
> + rc = ahci_platform_enable_resources(hpriv);
> + if (rc)
> + return rc;
> +
> + writel(dpriv->timv, hpriv->mmio + DWC_AHCI_HOST_TIMER1MS);
> +
> + for_each_set_bit(i, &port_map, AHCI_MAX_PORTS) {
> + port_mmio = __ahci_port_base(hpriv, i);
> + writel(dpriv->dmacr[i], port_mmio + DWC_AHCI_PORT_DMACR);
> + }
> +
> + return 0;
> +}
> +
> +static void dwc_ahci_clear_host(struct ahci_host_priv *hpriv)
> +{
> + ahci_platform_disable_resources(hpriv);
> +}
> +
> +static void dwc_ahci_stop_host(struct ata_host *host)
> +{
> + struct ahci_host_priv *hpriv = host->private_data;
> +
> + dwc_ahci_clear_host(hpriv);
> +}
> +
> +static struct ata_port_operations dwc_ahci_port_ops = {
> + .inherits = &ahci_platform_ops,
> + .host_stop = dwc_ahci_stop_host,
> +};
> +
> +static const struct ata_port_info dwc_ahci_port_info = {
> + .flags = AHCI_FLAG_COMMON,
> + .pio_mask = ATA_PIO4,
> + .udma_mask = ATA_UDMA6,
> + .port_ops = &dwc_ahci_port_ops,
> +};
> +
> +static struct scsi_host_template dwc_ahci_scsi_info = {
> + AHCI_SHT(DRV_NAME),
> +};
> +
> +static int dwc_ahci_probe(struct platform_device *pdev)
> +{
> + struct ahci_host_priv *hpriv;
> + int rc;
> +
> + hpriv = dwc_ahci_get_resources(pdev);
> + if (IS_ERR(hpriv))
> + return PTR_ERR(hpriv);
> +
> + rc = dwc_ahci_init_host(hpriv);
> + if (rc)
> + return rc;
> +
> + rc = ahci_platform_init_host(pdev, hpriv, &dwc_ahci_port_info,
> + &dwc_ahci_scsi_info);
> + if (rc)
> + goto err_clear_host;
> +
> + return 0;
> +
> +err_clear_host:
> + dwc_ahci_clear_host(hpriv);
> +
> + return rc;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int dwc_ahci_suspend(struct device *dev)
> +{
> + struct ata_host *host = dev_get_drvdata(dev);
> + struct ahci_host_priv *hpriv = host->private_data;
> + int rc;
> +
> + rc = ahci_platform_suspend_host(dev);
> + if (rc)
> + return rc;
> +
> + dwc_ahci_clear_host(hpriv);
> +
> + return 0;
> +}
> +
> +static int dwc_ahci_resume(struct device *dev)
> +{
> + struct ata_host *host = dev_get_drvdata(dev);
> + struct ahci_host_priv *hpriv = host->private_data;
> + int rc;
> +
> + rc = dwc_ahci_reinit_host(hpriv);
> + if (rc)
> + return rc;
> +
> + return ahci_platform_resume_host(dev);
> +}
> +#endif
> +
> +static SIMPLE_DEV_PM_OPS(dwc_ahci_pm_ops, dwc_ahci_suspend, dwc_ahci_resume);
> +
> +static const struct of_device_id dwc_ahci_of_match[] = {
> + { .compatible = "snps,dwc-ahci", },
> + { .compatible = "snps,spear-ahci", },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, dwc_ahci_of_match);
> +
> +static struct platform_driver dwc_ahci_driver = {
> + .probe = dwc_ahci_probe,
> + .remove = ata_platform_remove_one,
> + .shutdown = ahci_platform_shutdown,
> + .driver = {
> + .name = DRV_NAME,
> + .of_match_table = dwc_ahci_of_match,
> + .pm = &dwc_ahci_pm_ops,
> + },
> +};
> +module_platform_driver(dwc_ahci_driver);
> +
> +MODULE_DESCRIPTION("DWC AHCI SATA platform driver");
> +MODULE_AUTHOR("Serge Semin <Sergey.Semin@xxxxxxxxxxxxxxxxxxxx>");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
> index 24c25f076f37..052eaa30d262 100644
> --- a/drivers/ata/ahci_platform.c
> +++ b/drivers/ata/ahci_platform.c
> @@ -80,9 +80,7 @@ static SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_platform_suspend,
> static const struct of_device_id ahci_of_match[] = {
> { .compatible = "generic-ahci", },
> /* Keep the following compatibles for device tree compatibility */
> - { .compatible = "snps,spear-ahci", },
> { .compatible = "ibm,476gtr-ahci", },
> - { .compatible = "snps,dwc-ahci", },
> { .compatible = "hisilicon,hisi-ahci", },
> { .compatible = "cavium,octeon-7130-ahci", },
> {},

--
Damien Le Moal
Western Digital Research

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