[PATCH v2 1/3] starfive: pci: Add StarFive JH7110 pcie driver
Pali Rohár
pali at kernel.org
Wed Mar 8 08:31:59 CET 2023
Hello! See few comments below.
On Wednesday 08 March 2023 13:48:31 Minda Chen wrote:
> From: Mason Huo <mason.huo at starfivetech.com>
>
> Add pcie driver for StarFive JH7110, the driver depends on
> starfive gpio, pinctrl, clk and reset driver to do init.
>
> Several devices are tested:
> a) M.2 NVMe SSD
> b) Realtek 8169 Ethernet adapter.
>
> Signed-off-by: Mason Huo <mason.huo at starfivetech.com>
> Signed-off-by: Minda Chen <minda.chen at starfivetech.com>
> ---
> drivers/pci/Kconfig | 11 +
> drivers/pci/Makefile | 1 +
> drivers/pci/pcie_starfive_jh7110.c | 478 +++++++++++++++++++++++++++++
> 3 files changed, 490 insertions(+)
> create mode 100644 drivers/pci/pcie_starfive_jh7110.c
>
> diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
> index ef328d2652..e7b0ff5bc3 100644
> --- a/drivers/pci/Kconfig
> +++ b/drivers/pci/Kconfig
> @@ -374,4 +374,15 @@ config PCIE_UNIPHIER
> Say Y here if you want to enable PCIe controller support on
> UniPhier SoCs.
>
> +config PCIE_STARFIVE_JH7110
> + bool "Enable Starfive JH7110 PCIe driver"
> + depends on STARFIVE_JH7110
> + depends on PINCTRL_STARFIVE_JH7110
> + depends on CLK_JH7110
> + depends on RESET_JH7110
> + default y
> + help
> + Say Y here if you want to enable PCIe controller support on
> + StarFive JH7110 SoC.
> +
> endif
> diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
> index 49506e7ba5..bbe3323bb5 100644
> --- a/drivers/pci/Makefile
> +++ b/drivers/pci/Makefile
> @@ -49,3 +49,4 @@ obj-$(CONFIG_PCI_OCTEONTX) += pci_octeontx.o
> obj-$(CONFIG_PCIE_OCTEON) += pcie_octeon.o
> obj-$(CONFIG_PCIE_DW_SIFIVE) += pcie_dw_sifive.o
> obj-$(CONFIG_PCIE_UNIPHIER) += pcie_uniphier.o
> +obj-$(CONFIG_PCIE_STARFIVE_JH7110) += pcie_starfive_jh7110.o
> diff --git a/drivers/pci/pcie_starfive_jh7110.c b/drivers/pci/pcie_starfive_jh7110.c
> new file mode 100644
> index 0000000000..5ccef1ef02
> --- /dev/null
> +++ b/drivers/pci/pcie_starfive_jh7110.c
> @@ -0,0 +1,478 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * StarFive PLDA PCIe host controller driver
> + *
> + * Copyright (c) 2023 Starfive, Inc.
> + * Author: Mason Huo <mason.huo at starfivetech.com>
> + *
> + */
> +
> +#include <common.h>
> +#include <clk.h>
> +#include <dm.h>
> +#include <generic-phy.h>
> +#include <pci.h>
> +#include <power-domain.h>
> +#include <regmap.h>
> +#include <reset.h>
> +#include <syscon.h>
> +#include <asm/global_data.h>
> +#include <asm/io.h>
> +#include <asm-generic/gpio.h>
> +#include <dm/device_compat.h>
> +#include <dm/pinctrl.h>
> +#include <linux/delay.h>
> +#include <linux/iopoll.h>
> +#include <power/regulator.h>
> +
> +DECLARE_GLOBAL_DATA_PTR;
> +
> +#define GEN_SETTINGS 0x80
> +#define PCIE_PCI_IDS 0x9C
> +#define PCIE_WINROM 0xFC
> +#define PMSG_SUPPORT_RX 0x3F0
> +#define PCI_MISC 0xB4
> +
> +#define PLDA_EP_ENABLE 0
> +#define PLDA_RP_ENABLE 1
> +
> +#define IDS_REVISION_ID 0x02
> +#define IDS_PCI_TO_PCI_BRIDGE 0x060400
> +#define IDS_CLASS_CODE_SHIFT 8
Please do not duplicate standard PCI macros and constants. In U-Boot
they are already available in include/pci_ids.h header file.
> +#define PREF_MEM_WIN_64_SUPPORT BIT(3)
> +#define PMSG_LTR_SUPPORT BIT(2)
> +#define PLDA_FUNCTION_DIS BIT(15)
> +#define PLDA_FUNC_NUM 4
> +#define PLDA_PHY_FUNC_SHIFT 9
> +
> +#define XR3PCI_ATR_AXI4_SLV0 0x800
> +#define XR3PCI_ATR_SRC_ADDR_LOW 0x0
> +#define XR3PCI_ATR_SRC_ADDR_HIGH 0x4
> +#define XR3PCI_ATR_TRSL_ADDR_LOW 0x8
> +#define XR3PCI_ATR_TRSL_ADDR_HIGH 0xc
> +#define XR3PCI_ATR_TRSL_PARAM 0x10
> +#define XR3PCI_ATR_TABLE_OFFSET 0x20
> +#define XR3PCI_ATR_MAX_TABLE_NUM 8
> +
> +#define XR3PCI_ATR_SRC_WIN_SIZE_SHIFT 1
> +#define XR3PCI_ATR_SRC_ADDR_MASK GENMASK(31, 12)
> +#define XR3PCI_ATR_TRSL_ADDR_MASK GENMASK(31, 12)
> +#define XR3_PCI_ECAM_SIZE 28
> +#define XR3PCI_ATR_TRSL_DIR BIT(22)
> +/* IDs used in the XR3PCI_ATR_TRSL_PARAM */
> +#define XR3PCI_ATR_TRSLID_PCIE_MEMORY 0x0
> +#define XR3PCI_ATR_TRSLID_PCIE_CONFIG 0x1
> +
> +#define ECAM_BUS_SHIFT 20
> +#define ECAM_DEV_SHIFT 15
> +#define ECAM_FUNC_SHIFT 12
Please do not implement duplicate PCIe ECAM code. U-Boot and also Linux
kernel already provides PCIE_ECAM_OFFSET() macro.
> +/* Secondary bus number offset in config space */
> +#define PCI_SECONDARY_BUS 0x19
Unused.
> +
> +/* system control */
> +#define STG_SYSCON_K_RP_NEP_MASK BIT(8)
> +#define STG_SYSCON_AXI4_SLVL_ARFUNC_MASK GENMASK(22, 8)
> +#define STG_SYSCON_AXI4_SLVL_ARFUNC_SHIFT 8
> +#define STG_SYSCON_AXI4_SLVL_AWFUNC_MASK GENMASK(14, 0)
> +#define STG_SYSCON_CLKREQ_MASK BIT(22)
> +#define STG_SYSCON_CKREF_SRC_SHIFT 18
> +#define STG_SYSCON_CKREF_SRC_MASK GENMASK(19, 18)
> +
> +struct starfive_pcie {
> + struct udevice *dev;
> +
> + void __iomem *reg_base;
> + void __iomem *cfg_base;
> +
> + struct regmap *regmap;
> + u32 stg_arfun;
> + u32 stg_awfun;
> + u32 stg_rp_nep;
> +
> + struct clk_bulk clks;
> + struct reset_ctl_bulk rsts;
> +
> + int atr_table_num;
> + int first_busno;
> +};
> +
> +static int starfive_pcie_addr_valid(pci_dev_t bdf, int first_busno)
> +{
> + if ((PCI_BUS(bdf) == first_busno) && (PCI_DEV(bdf) > 0))
> + return 0;
> + if ((PCI_BUS(bdf) == first_busno + 1) && (PCI_DEV(bdf) > 0))
> + return 0;
If fisrt_busno is the bus of the root port then first_busno+1 does not
have to bus of the PCIe device on the other end of the link from the
root port. See for example pci_mvebu.c how this logic is handled.
You probably want to also limit access to non-zero function of root port
unless you have multifunction root-port device.
> +
> + return 1;
> +}
> +
> +static int starfive_pcie_off_conf(pci_dev_t bdf, uint offset)
> +{
> + unsigned int bus = PCI_BUS(bdf);
> + unsigned int dev = PCI_DEV(bdf);
> + unsigned int func = PCI_FUNC(bdf);
> +
> + return (bus << ECAM_BUS_SHIFT) | (dev << ECAM_DEV_SHIFT) |
> + (func << ECAM_FUNC_SHIFT) | offset;
> +}
> +
> +static bool starfive_pcie_hide_rc_bar(pci_dev_t bdf, int offset)
> +{
> + /* Only root port 1 is in use */
> + if ((PCI_BUS(bdf) == 0) &&
This looks like an incorrect check for the bus of he root port.
See for example pci_mvebu.c where logic should be correct.
I guess you wanted to use: PCI_BUS(bdf)-dev_seq(udev)
> + (offset == PCI_BASE_ADDRESS_0 || offset == PCI_BASE_ADDRESS_1))
> + return true;
> +
> + return false;
> +}
> +
> +static int starfive_pcie_conf_address(const struct udevice *udev, pci_dev_t bdf,
> + uint offset, void **paddr)
> +{
> + struct starfive_pcie *priv = dev_get_priv(udev);
> + int where = starfive_pcie_off_conf(bdf, offset);
> +
> + if (!starfive_pcie_addr_valid(bdf, priv->first_busno))
> + return -EINVAL;
Is this check needed? Does it mean that ECAM returns bogus information
for disconnected devices, that it needs to be manually filtered? (Which
is against PCIe spec).
> +
> + *paddr = (void *)(priv->cfg_base + where);
> + return 0;
> +}
> +
> +static int starfive_pcie_config_read(const struct udevice *udev, pci_dev_t bdf,
> + uint offset, ulong *valuep,
> + enum pci_size_t size)
> +{
> + /* Make sure the LAST TLP is finished, before reading vendor ID. */
> + if (offset == PCI_VENDOR_ID)
> + mdelay(20);
This looks strange. There is some bug / errata that reading vendor id
from ECAM does not work correctly?
> +
> + return pci_generic_mmap_read_config(udev, starfive_pcie_conf_address,
> + bdf, offset, valuep, size);
> +}
> +
> +int starfive_pcie_config_write(struct udevice *udev, pci_dev_t bdf,
> + uint offset, ulong value,
> + enum pci_size_t size)
> +{
> + if (starfive_pcie_hide_rc_bar(bdf, offset))
> + return 0;
Why you are ignoring writes to some offset, but not ignoring reads? And
ignoring results in no-error (return value 0)?
> +
> + return pci_generic_mmap_write_config(udev, starfive_pcie_conf_address,
> + bdf, offset, value, size);
> +}
> +
> +static int starfive_pcie_set_atr_entry(struct starfive_pcie *priv, phys_addr_t src_addr,
> + phys_addr_t trsl_addr, size_t window_size,
> + int trsl_param)
> +{
> + void __iomem *base =
> + priv->reg_base + XR3PCI_ATR_AXI4_SLV0;
> +
> + /* Support AXI4 Slave 0 Address Translation Tables 0-7. */
> + if (priv->atr_table_num >= XR3PCI_ATR_MAX_TABLE_NUM) {
> + dev_err(priv->dev, "ATR table number %d exceeds max num\n",
> + priv->atr_table_num);
> + return -EINVAL;
> + }
> + base += XR3PCI_ATR_TABLE_OFFSET * priv->atr_table_num;
> + priv->atr_table_num++;
> +
> + /* X3PCI_ATR_SRC_ADDR_LOW:
> + * - bit 0: enable entry,
> + * - bits 1-6: ATR window size: total size in bytes: 2^(ATR_WSIZE + 1)
> + * - bits 7-11: reserved
> + * - bits 12-31: start of source address
> + */
> + writel((lower_32_bits(src_addr) & XR3PCI_ATR_SRC_ADDR_MASK) |
> + (fls(window_size) - 1) << XR3PCI_ATR_SRC_WIN_SIZE_SHIFT | 1,
> + base + XR3PCI_ATR_SRC_ADDR_LOW);
> + writel(upper_32_bits(src_addr), base + XR3PCI_ATR_SRC_ADDR_HIGH);
> + writel((lower_32_bits(trsl_addr) & XR3PCI_ATR_TRSL_ADDR_MASK),
> + base + XR3PCI_ATR_TRSL_ADDR_LOW);
> + writel(upper_32_bits(trsl_addr), base + XR3PCI_ATR_TRSL_ADDR_HIGH);
> + writel(trsl_param, base + XR3PCI_ATR_TRSL_PARAM);
> +
> + dev_dbg(priv->dev, "ATR entry: 0x%010llx %s 0x%010llx [0x%010llx] (param: 0x%06x)\n",
> + src_addr, (trsl_param & XR3PCI_ATR_TRSL_DIR) ? "<-" : "->",
> + trsl_addr, (u64)window_size, trsl_param);
> + return 0;
> +}
> +
> +static int starfive_pcie_atr_init(struct starfive_pcie *priv)
> +{
> + struct udevice *ctlr = pci_get_controller(priv->dev);
> + struct pci_controller *hose = dev_get_uclass_priv(ctlr);
> + int i, ret;
> +
> + /* As the two host bridges in JH7110 soc have the same default
> + * address translation table, this cause the second root port can't
> + * access it's host bridge config space correctly.
> + * To workaround, config the ATR of host bridge config space by SW.
> + */
> +
> + ret = starfive_pcie_set_atr_entry(priv,
> + (phys_addr_t)priv->cfg_base,
> + 0,
> + 1 << XR3_PCI_ECAM_SIZE,
> + XR3PCI_ATR_TRSLID_PCIE_CONFIG);
> + if (ret)
> + return ret;
> +
> + for (i = 0; i < hose->region_count; i++) {
> + if (hose->regions[i].flags == PCI_REGION_SYS_MEMORY)
> + continue;
> +
> + /* Only support identity mappings. */
> + if (hose->regions[i].bus_start !=
> + hose->regions[i].phys_start)
> + return -EINVAL;
> +
> + ret = starfive_pcie_set_atr_entry(priv,
> + hose->regions[i].phys_start,
> + hose->regions[i].bus_start,
> + hose->regions[i].size,
> + XR3PCI_ATR_TRSLID_PCIE_MEMORY);
> + if (ret)
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int starfive_pcie_get_syscon(struct udevice *dev)
> +{
> + struct starfive_pcie *priv = dev_get_priv(dev);
> + struct udevice *syscon;
> + struct ofnode_phandle_args syscfg_phandle;
> + u32 cells[4];
> + int ret;
> +
> + /* get corresponding syscon phandle */
> + ret = dev_read_phandle_with_args(dev, "starfive,stg-syscon", NULL, 0, 0,
> + &syscfg_phandle);
> +
> + if (ret < 0) {
> + dev_err(dev, "Can't get syscfg phandle: %d\n", ret);
> + return ret;
> + }
> +
> + ret = uclass_get_device_by_ofnode(UCLASS_SYSCON, syscfg_phandle.node,
> + &syscon);
> + if (ret) {
> + dev_err(dev, "Unable to find syscon device (%d)\n", ret);
> + return ret;
> + }
> +
> + priv->regmap = syscon_get_regmap(syscon);
> + if (!priv->regmap) {
> + dev_err(dev, "Unable to find regmap\n");
> + return -ENODEV;
> + }
> +
> + /* get syscon register offset */
> + ret = dev_read_u32_array(dev, "starfive,stg-syscon",
> + cells, ARRAY_SIZE(cells));
> + if (ret) {
> + dev_err(dev, "Get syscon register err %d\n", ret);
> + return -EINVAL;
> + }
> +
> + dev_dbg(dev, "Get syscon values: %x, %x, %x\n",
> + cells[1], cells[2], cells[3]);
> + priv->stg_arfun = cells[1];
> + priv->stg_awfun = cells[2];
> + priv->stg_rp_nep = cells[3];
> +
> + return 0;
> +}
> +
> +static int starfive_pcie_parse_dt(struct udevice *dev)
> +{
> + struct starfive_pcie *priv = dev_get_priv(dev);
> + int ret;
> +
> + priv->reg_base = (void *)dev_read_addr_name(dev, "reg");
> + if (priv->reg_base == (void __iomem *)FDT_ADDR_T_NONE) {
> + dev_err(dev, "Missing required reg address range\n");
> + return -EINVAL;
> + }
> +
> + priv->cfg_base = (void *)dev_read_addr_name(dev, "config");
> + if (priv->cfg_base == (void __iomem *)FDT_ADDR_T_NONE) {
> + dev_err(dev, "Missing required config address range");
> + return -EINVAL;
> + }
> +
> + ret = starfive_pcie_get_syscon(dev);
> + if (ret) {
> + dev_err(dev, "Can't get syscon: %d\n", ret);
> + return ret;
> + }
> +
> + ret = reset_get_bulk(dev, &priv->rsts);
> + if (ret) {
> + dev_err(dev, "Can't get reset: %d\n", ret);
> + return ret;
> + }
> +
> + ret = clk_get_bulk(dev, &priv->clks);
> + if (ret) {
> + dev_err(dev, "Can't get clock: %d\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int starfive_pcie_init_port(struct udevice *dev)
> +{
> + int ret, i;
> + unsigned int value;
> + struct starfive_pcie *priv = dev_get_priv(dev);
> +
> + ret = clk_enable_bulk(&priv->clks);
> + if (ret) {
> + dev_err(dev, "Failed to enable clks (ret=%d)\n", ret);
> + return ret;
> + }
> +
> + ret = reset_deassert_bulk(&priv->rsts);
> + if (ret) {
> + dev_err(dev, "Failed to deassert resets (ret=%d)\n", ret);
> + goto err_deassert_clk;
> + }
> +
> + ret = pinctrl_select_state(dev, "perst-active");
> + if (ret) {
> + dev_err(dev, "Set perst-active pinctrl failed: %d\n", ret);
> + goto err_deassert_reset;
> + }
> +
> + /* Disable physical functions except #0 */
> + for (i = 1; i < PLDA_FUNC_NUM; i++) {
> + regmap_update_bits(priv->regmap,
> + priv->stg_arfun,
> + STG_SYSCON_AXI4_SLVL_ARFUNC_MASK,
> + (i << PLDA_PHY_FUNC_SHIFT) <<
> + STG_SYSCON_AXI4_SLVL_ARFUNC_SHIFT);
> + regmap_update_bits(priv->regmap,
> + priv->stg_awfun,
> + STG_SYSCON_AXI4_SLVL_AWFUNC_MASK,
> + i << PLDA_PHY_FUNC_SHIFT);
> +
> + value = readl(priv->reg_base + PCI_MISC);
> + value |= PLDA_FUNCTION_DIS;
> + writel(value, priv->reg_base + PCI_MISC);
> + }
> +
> + /* Disable physical functions */
> + regmap_update_bits(priv->regmap,
> + priv->stg_arfun,
> + STG_SYSCON_AXI4_SLVL_ARFUNC_MASK,
> + 0);
> + regmap_update_bits(priv->regmap,
> + priv->stg_awfun,
> + STG_SYSCON_AXI4_SLVL_AWFUNC_MASK,
> + 0);
> +
> + /* Enable root port */
> + value = readl(priv->reg_base + GEN_SETTINGS);
> + value |= PLDA_RP_ENABLE;
> + writel(value, priv->reg_base + GEN_SETTINGS);
> +
> + /* PCIe PCI Standard Configuration Identification Settings. */
> + value = (IDS_PCI_TO_PCI_BRIDGE << IDS_CLASS_CODE_SHIFT) | IDS_REVISION_ID;
> + writel(value, priv->reg_base + PCIE_PCI_IDS);
> +
> + /* The LTR message forwarding of PCIe Message Reception was set by core
> + * as default, but the forward id & addr are also need to be reset.
> + * If we do not disable LTR message forwarding here, or set a legal
> + * forwarding address, the kernel will get stuck after this driver probe.
> + * To workaround, disable the LTR message forwarding support on
> + * PCIe Message Reception.
> + */
> + value = readl(priv->reg_base + PMSG_SUPPORT_RX);
> + value &= ~PMSG_LTR_SUPPORT;
> + writel(value, priv->reg_base + PMSG_SUPPORT_RX);
> +
> + /* Prefetchable memory window 64-bit addressing support */
> + value = readl(priv->reg_base + PCIE_WINROM);
> + value |= PREF_MEM_WIN_64_SUPPORT;
> + writel(value, priv->reg_base + PCIE_WINROM);
> +
> + starfive_pcie_atr_init(priv);
> +
> + /* Ensure that PERST has been asserted for at least 300 ms */
> + mdelay(300);
> + ret = pinctrl_select_state(dev, "perst-default");
> + if (ret) {
> + dev_err(dev, "Set perst-default pinctrl failed: %d\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +
> +err_deassert_clk:
> + clk_disable_bulk(&priv->clks);
> +err_deassert_reset:
> + reset_assert_bulk(&priv->rsts);
> + return ret;
> +}
> +
> +static int starfive_pcie_probe(struct udevice *dev)
> +{
> + struct starfive_pcie *priv = dev_get_priv(dev);
> + int ret;
> +
> + priv->atr_table_num = 0;
> + priv->dev = dev;
> + priv->first_busno = dev_seq(dev);
> +
> + ret = starfive_pcie_parse_dt(dev);
> + if (ret)
> + return ret;
> +
> + regmap_update_bits(priv->regmap,
> + priv->stg_rp_nep,
> + STG_SYSCON_K_RP_NEP_MASK,
> + STG_SYSCON_K_RP_NEP_MASK);
> +
> + regmap_update_bits(priv->regmap,
> + priv->stg_awfun,
> + STG_SYSCON_CKREF_SRC_MASK,
> + 2 << STG_SYSCON_CKREF_SRC_SHIFT);
> +
> + regmap_update_bits(priv->regmap,
> + priv->stg_awfun,
> + STG_SYSCON_CLKREQ_MASK,
> + STG_SYSCON_CLKREQ_MASK);
> +
> + ret = starfive_pcie_init_port(dev);
> + if (ret)
> + return ret;
> +
> + dev_err(dev, "Starfive PCIe bus probed.\n");
> +
> + return 0;
> +}
> +
> +static const struct dm_pci_ops starfive_pcie_ops = {
> + .read_config = starfive_pcie_config_read,
> + .write_config = starfive_pcie_config_write,
> +};
> +
> +static const struct udevice_id starfive_pcie_ids[] = {
> + { .compatible = "starfive,jh7110-pcie" },
> + { }
> +};
> +
> +U_BOOT_DRIVER(starfive_pcie_drv) = {
> + .name = "starfive_7110_pcie",
> + .id = UCLASS_PCI,
> + .of_match = starfive_pcie_ids,
> + .ops = &starfive_pcie_ops,
> + .probe = starfive_pcie_probe,
> + .priv_auto = sizeof(struct starfive_pcie),
> +};
> --
> 2.17.1
>
More information about the U-Boot
mailing list