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Message-ID: <20191115101915.GO32742@smile.fi.intel.com>
Date: Fri, 15 Nov 2019 12:19:15 +0200
From: Andy Shevchenko <andriy.shevchenko@...el.com>
To: Dilip Kota <eswara.kota@...ux.intel.com>
Cc: gustavo.pimentel@...opsys.com, lorenzo.pieralisi@....com,
andrew.murray@....com, helgaas@...nel.org, jingoohan1@...il.com,
robh@...nel.org, martin.blumenstingl@...glemail.com,
linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, cheol.yong.kim@...el.com,
chuanhua.lei@...ux.intel.com, qi-ming.wu@...el.com
Subject: Re: [PATCH v7 2/3] dwc: PCI: intel: PCIe RC controller driver
On Fri, Nov 15, 2019 at 10:30:43AM +0800, Dilip Kota wrote:
> Add support to PCIe RC controller on Intel Gateway SoCs.
> PCIe controller is based of Synopsys DesignWare PCIe core.
>
> Intel PCIe driver requires Upconfigure support, Fast Training
> Sequence and link speed configurations. So adding the respective
> helper functions in the PCIe DesignWare framework.
> It also programs hardware autonomous speed during speed
> configuration so defining it in pci_regs.h.
FWIW,
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...el.com>
Although few nitpicks below.
> Signed-off-by: Dilip Kota <eswara.kota@...ux.intel.com>
> Reviewed-by: Andrew Murray <andrew.murray@....com>
> Acked-by: Gustavo Pimentel <gustavo.pimentel@...opsys.com>
> ---
> Changes on v7:
> Add Acked-by: Gustavo Pimentel <gustavo.pimentel@...opsys.com>
> Remove unused header files.
> #include <linux/interrupt.h>
> #include <linux/of_irq.h>
> #include <linux/of_pci.h>
> #include <linux/of_platform.h>
>
> Changes on v6:
> Add Reviewed-by: Andrew Murray <andrew.murray@....com>
> Address review comments:
> Remove extra space in Kconfig
> Fix style indents in switch case
> Apply mask for the n_fts argument in dw_pcie_link_set_n_fts()
> to prevent the case of n_fts value having outside the mask bits
> Update PORT_LOGIC_N_FTS to PORT_LOGIC_N_FTS_MASK
> Update BUS_IATU_OFFS to BUS_IATU_OFFSET
> Update RST_INTRVL_DFT_MS to RESET_INTERVAL_MS
> Reduce local variables in pcie_update_bits()
> Remove blank lines
> Remove extra paranthesis during readl_poll_timeout() call
> Add error handling for dw_pcie_find_capability() call
> Add blank line before dev_info() in probe()
>
> Changes on v5:
> Use new, old variables in pcie_update_bits()
> Correct naming:
> s/Designware/DesignWare
> s/pcie/PCIe
> s/pci/PCI
> s/Hw/HW
> Upconfig to Upconfigure
> Remove extra lines after the intel_pcie_max_speed_setup() def.
> Use pcie_link_speed[] and remove enum for pcie gen.
> Remove dw_pcie_link_speed_change() def.
> Remove "linux,pci-domain" parsing.
> Remove 'id' variable in intel_pcie_port structure.
> Remove extra spaces for lpp->link_gen =
> Correct the offset of PCI_EXP_LNKCTL2_HASD to 0x0020.
> Remove programming of RCB and CCC bits in PCI_EXP_LCTL reg.
> Remove programming Slot clock cfg in PCI_EXP_LSTS reg.
> Update the comments at num_viewport setting.
> Update the description in Kconfig.
> Get PCIe cap offset from the registers using dw_pcie_find_capability()
> Define pcie_cap_ofst var in intel_pcie_port struct to store the same.
> Remove the PCIE_CAP_OFST macro.
> Move intel_pcie_max_speed_setup() function to DesignWare framework,
> defined as dw_pcie_link_set_max_speed()
> Set EXPORT_SYMBOL_GPL for the newer functions defined in
> pcie-designware.c
>
> Changes on v4:
> Rename the driver naming and description to
> "PCIe RC controller on Intel Gateway SoCs".
> Use PCIe core register macros defined in pci_regs.h
> and remove respective local definitions.
> Remove PCIe core interrupt handling.
> Move PCIe link control speed change, upconfig and FTS.
> configuration functions to DesignWare framework.
> Use of_pci_get_max_link_speed().
> Mark dependency on X86 and COMPILE_TEST in Kconfig.
> Remove lanes and add n_fts variables in intel_pcie_port structure.
> Rename rst_interval variable to rst_intrvl in intel_pcie_port structure.
> Remove intel_pcie_mem_iatu() as it is already perfomed in dw_setup_rc()
> Move sysfs attributes specific code to separate patch.
> Remove redundant error handling.
> Reduce LoCs by doing variable initializations while declaration itself.
> Add extra line after closing parenthesis.
> Move intel_pcie_ep_rst_init() out of get_resources()
>
> changes on v3:
> Rename PCIe app logic registers with PCIE_APP prefix.
> PCIE_IOP_CTRL configuration is not required. Remove respective code.
> Remove wrapper functions for clk enable/disable APIs.
> Use platform_get_resource_byname() instead of
> devm_platform_ioremap_resource() to be similar with DWC framework.
> Rename phy name to "pciephy".
> Modify debug message in msi_init() callback to be more specific.
> Remove map_irq() callback.
> Enable the INTx interrupts at the time of PCIe initialization.
> Reduce memory fragmentation by using variable "struct dw_pcie pci"
> instead of allocating memory.
> Reduce the delay to 100us during enpoint initialization
> intel_pcie_ep_rst_init().
> Call dw_pcie_host_deinit() during remove() instead of directly
> calling PCIe core APIs.
> Rename "intel,rst-interval" to "reset-assert-ms".
> Remove unused APP logic Interrupt bit macro definitions.
> Use dwc framework's dw_pcie_setup_rc() for PCIe host specific
> configuration instead of redefining the same functionality in
> the driver.
> Move the whole DT parsing specific code to intel_pcie_get_resources()
>
> drivers/pci/controller/dwc/Kconfig | 10 +
> drivers/pci/controller/dwc/Makefile | 1 +
> drivers/pci/controller/dwc/pcie-designware.c | 57 +++
> drivers/pci/controller/dwc/pcie-designware.h | 12 +
> drivers/pci/controller/dwc/pcie-intel-gw.c | 542 +++++++++++++++++++++++++++
> include/uapi/linux/pci_regs.h | 1 +
> 6 files changed, 623 insertions(+)
> create mode 100644 drivers/pci/controller/dwc/pcie-intel-gw.c
>
> diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig
> index 0ba988b5b5bc..fb6d474477df 100644
> --- a/drivers/pci/controller/dwc/Kconfig
> +++ b/drivers/pci/controller/dwc/Kconfig
> @@ -82,6 +82,16 @@ config PCIE_DW_PLAT_EP
> order to enable device-specific features PCI_DW_PLAT_EP must be
> selected.
>
> +config PCIE_INTEL_GW
> + bool "Intel Gateway PCIe host controller support"
> + depends on OF && (X86 || COMPILE_TEST)
> + select PCIE_DW_HOST
> + help
> + Say 'Y' here to enable PCIe Host controller support on Intel
> + Gateway SoCs.
> + The PCIe controller uses the DesignWare core plus Intel-specific
> + hardware wrappers.
> +
> config PCI_EXYNOS
> bool "Samsung Exynos PCIe controller"
> depends on SOC_EXYNOS5440 || COMPILE_TEST
> diff --git a/drivers/pci/controller/dwc/Makefile b/drivers/pci/controller/dwc/Makefile
> index b30336181d46..99db83cd2f35 100644
> --- a/drivers/pci/controller/dwc/Makefile
> +++ b/drivers/pci/controller/dwc/Makefile
> @@ -3,6 +3,7 @@ obj-$(CONFIG_PCIE_DW) += pcie-designware.o
> obj-$(CONFIG_PCIE_DW_HOST) += pcie-designware-host.o
> obj-$(CONFIG_PCIE_DW_EP) += pcie-designware-ep.o
> obj-$(CONFIG_PCIE_DW_PLAT) += pcie-designware-plat.o
> +obj-$(CONFIG_PCIE_INTEL_GW) += pcie-intel-gw.o
> obj-$(CONFIG_PCI_DRA7XX) += pci-dra7xx.o
> obj-$(CONFIG_PCI_EXYNOS) += pci-exynos.o
> obj-$(CONFIG_PCI_IMX6) += pci-imx6.o
> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> index 820488dfeaed..479e250695a0 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.c
> +++ b/drivers/pci/controller/dwc/pcie-designware.c
> @@ -14,6 +14,8 @@
>
> #include "pcie-designware.h"
>
> +extern const unsigned char pcie_link_speed[];
> +
> /*
> * These interfaces resemble the pci_find_*capability() interfaces, but these
> * are for configuring host controllers, which are bridges *to* PCI devices but
> @@ -474,6 +476,61 @@ int dw_pcie_link_up(struct dw_pcie *pci)
> (!(val & PCIE_PORT_DEBUG1_LINK_IN_TRAINING)));
> }
>
> +void dw_pcie_upconfig_setup(struct dw_pcie *pci)
> +{
> + u32 val;
> +
> + val = dw_pcie_readl_dbi(pci, PCIE_PORT_MULTI_LANE_CTRL);
> + val |= PORT_MLTI_UPCFG_SUPPORT;
> + dw_pcie_writel_dbi(pci, PCIE_PORT_MULTI_LANE_CTRL, val);
> +}
> +EXPORT_SYMBOL_GPL(dw_pcie_upconfig_setup);
> +
> +void dw_pcie_link_set_max_speed(struct dw_pcie *pci, u32 link_gen)
> +{
> + u32 reg, val;
> + u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
> +
> + reg = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCTL2);
> + reg &= ~PCI_EXP_LNKCTL2_TLS;
> +
> + switch (pcie_link_speed[link_gen]) {
> + case PCIE_SPEED_2_5GT:
> + reg |= PCI_EXP_LNKCTL2_TLS_2_5GT;
> + break;
> + case PCIE_SPEED_5_0GT:
> + reg |= PCI_EXP_LNKCTL2_TLS_5_0GT;
> + break;
> + case PCIE_SPEED_8_0GT:
> + reg |= PCI_EXP_LNKCTL2_TLS_8_0GT;
> + break;
> + case PCIE_SPEED_16_0GT:
> + reg |= PCI_EXP_LNKCTL2_TLS_16_0GT;
> + break;
> + default:
> + /* Use hardware capability */
> + val = dw_pcie_readl_dbi(pci, offset + PCI_EXP_LNKCAP);
> + val = FIELD_GET(PCI_EXP_LNKCAP_SLS, val);
> + reg &= ~PCI_EXP_LNKCTL2_HASD;
> + reg |= FIELD_PREP(PCI_EXP_LNKCTL2_TLS, val);
> + break;
> + }
> +
> + dw_pcie_writel_dbi(pci, offset + PCI_EXP_LNKCTL2, reg);
> +}
> +EXPORT_SYMBOL_GPL(dw_pcie_link_set_max_speed);
> +
> +void dw_pcie_link_set_n_fts(struct dw_pcie *pci, u32 n_fts)
> +{
> + u32 val;
> +
> + val = dw_pcie_readl_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL);
> + val &= ~PORT_LOGIC_N_FTS_MASK;
> + val |= n_fts & PORT_LOGIC_N_FTS_MASK;
> + dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, val);
> +}
> +EXPORT_SYMBOL_GPL(dw_pcie_link_set_n_fts);
> +
> static u8 dw_pcie_iatu_unroll_enabled(struct dw_pcie *pci)
> {
> u32 val;
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index 5a18e94e52c8..3b0be5cd9235 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -30,7 +30,12 @@
> #define LINK_WAIT_IATU 9
>
> /* Synopsys-specific PCIe configuration registers */
> +#define PCIE_PORT_AFR 0x70C
> +#define PORT_AFR_N_FTS_MASK GENMASK(15, 8)
> +#define PORT_AFR_CC_N_FTS_MASK GENMASK(23, 16)
> +
> #define PCIE_PORT_LINK_CONTROL 0x710
> +#define PORT_LINK_DLL_LINK_EN BIT(5)
> #define PORT_LINK_MODE_MASK GENMASK(21, 16)
> #define PORT_LINK_MODE(n) FIELD_PREP(PORT_LINK_MODE_MASK, n)
> #define PORT_LINK_MODE_1_LANES PORT_LINK_MODE(0x1)
> @@ -46,6 +51,7 @@
> #define PCIE_PORT_DEBUG1_LINK_IN_TRAINING BIT(29)
>
> #define PCIE_LINK_WIDTH_SPEED_CONTROL 0x80C
> +#define PORT_LOGIC_N_FTS_MASK GENMASK(7, 0)
> #define PORT_LOGIC_SPEED_CHANGE BIT(17)
> #define PORT_LOGIC_LINK_WIDTH_MASK GENMASK(12, 8)
> #define PORT_LOGIC_LINK_WIDTH(n) FIELD_PREP(PORT_LOGIC_LINK_WIDTH_MASK, n)
> @@ -60,6 +66,9 @@
> #define PCIE_MSI_INTR0_MASK 0x82C
> #define PCIE_MSI_INTR0_STATUS 0x830
>
> +#define PCIE_PORT_MULTI_LANE_CTRL 0x8C0
> +#define PORT_MLTI_UPCFG_SUPPORT BIT(7)
> +
> #define PCIE_ATU_VIEWPORT 0x900
> #define PCIE_ATU_REGION_INBOUND BIT(31)
> #define PCIE_ATU_REGION_OUTBOUND 0
> @@ -273,6 +282,9 @@ void dw_pcie_write_dbi2(struct dw_pcie *pci, u32 reg, size_t size, u32 val);
> u32 dw_pcie_read_atu(struct dw_pcie *pci, u32 reg, size_t size);
> void dw_pcie_write_atu(struct dw_pcie *pci, u32 reg, size_t size, u32 val);
> int dw_pcie_link_up(struct dw_pcie *pci);
> +void dw_pcie_upconfig_setup(struct dw_pcie *pci);
> +void dw_pcie_link_set_max_speed(struct dw_pcie *pci, u32 link_gen);
> +void dw_pcie_link_set_n_fts(struct dw_pcie *pci, u32 n_fts);
> int dw_pcie_wait_for_link(struct dw_pcie *pci);
> void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index,
> int type, u64 cpu_addr, u64 pci_addr,
> diff --git a/drivers/pci/controller/dwc/pcie-intel-gw.c b/drivers/pci/controller/dwc/pcie-intel-gw.c
> new file mode 100644
> index 000000000000..cd000cd5bed7
> --- /dev/null
> +++ b/drivers/pci/controller/dwc/pcie-intel-gw.c
> @@ -0,0 +1,542 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * PCIe host controller driver for Intel Gateway SoCs
> + *
> + * Copyright (c) 2019 Intel Corporation.
> + */
> +
> +#include <linux/bitfield.h>
> +#include <linux/clk.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/iopoll.h>
> +#include <linux/pci_regs.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/reset.h>
> +
> +#include "../../pci.h"
> +#include "pcie-designware.h"
> +
> +#define PORT_AFR_N_FTS_GEN12_DFT (SZ_128 - 1)
> +#define PORT_AFR_N_FTS_GEN3 180
> +#define PORT_AFR_N_FTS_GEN4 196
> +
> +/* PCIe Application logic Registers */
> +#define PCIE_APP_CCR 0x10
> +#define PCIE_APP_CCR_LTSSM_ENABLE BIT(0)
> +
> +#define PCIE_APP_MSG_CR 0x30
> +#define PCIE_APP_MSG_XMT_PM_TURNOFF BIT(0)
> +
> +#define PCIE_APP_PMC 0x44
> +#define PCIE_APP_PMC_IN_L2 BIT(20)
> +
> +#define PCIE_APP_IRNEN 0xF4
> +#define PCIE_APP_IRNCR 0xF8
> +#define PCIE_APP_IRN_AER_REPORT BIT(0)
> +#define PCIE_APP_IRN_PME BIT(2)
> +#define PCIE_APP_IRN_RX_VDM_MSG BIT(4)
> +#define PCIE_APP_IRN_PM_TO_ACK BIT(9)
> +#define PCIE_APP_IRN_LINK_AUTO_BW_STAT BIT(11)
> +#define PCIE_APP_IRN_BW_MGT BIT(12)
> +#define PCIE_APP_IRN_MSG_LTR BIT(18)
> +#define PCIE_APP_IRN_SYS_ERR_RC BIT(29)
> +#define PCIE_APP_INTX_OFST 12
> +
> +#define PCIE_APP_IRN_INT \
> + (PCIE_APP_IRN_AER_REPORT | PCIE_APP_IRN_PME | \
> + PCIE_APP_IRN_RX_VDM_MSG | PCIE_APP_IRN_SYS_ERR_RC | \
> + PCIE_APP_IRN_PM_TO_ACK | PCIE_APP_IRN_MSG_LTR | \
> + PCIE_APP_IRN_BW_MGT | PCIE_APP_IRN_LINK_AUTO_BW_STAT | \
> + (PCIE_APP_INTX_OFST + PCI_INTERRUPT_INTA) | \
> + (PCIE_APP_INTX_OFST + PCI_INTERRUPT_INTB) | \
> + (PCIE_APP_INTX_OFST + PCI_INTERRUPT_INTC) | \
> + (PCIE_APP_INTX_OFST + PCI_INTERRUPT_INTD))
These can be shifted left by two TABs.
> +
> +#define BUS_IATU_OFFSET SZ_256M
> +#define RESET_INTERVAL_MS 100
> +
> +struct intel_pcie_soc {
> + unsigned int pcie_ver;
> + unsigned int pcie_atu_offset;
> + u32 num_viewport;
> +};
> +
> +struct intel_pcie_port {
> + struct dw_pcie pci;
> + void __iomem *app_base;
> + struct gpio_desc *reset_gpio;
> + u32 rst_intrvl;
> + u32 max_speed;
> + u32 link_gen;
> + u32 max_width;
> + u32 n_fts;
> + struct clk *core_clk;
> + struct reset_control *core_rst;
> + struct phy *phy;
> + u8 pcie_cap_ofst;
> +};
> +
> +static void pcie_update_bits(void __iomem *base, u32 mask, u32 val, u32 ofs)
More logical ordering of the parameters will be base, offset, mask, value.
> +{
> + u32 old;
> +
> + old = readl(base + ofs);
> + val = (old & ~mask) | (val & mask);
> +
> + if (val != old)
> + writel(val, base + ofs);
> +}
> +
> +static inline u32 pcie_app_rd(struct intel_pcie_port *lpp, u32 ofs)
> +{
> + return readl(lpp->app_base + ofs);
> +}
> +
> +static inline void pcie_app_wr(struct intel_pcie_port *lpp, u32 val, u32 ofs)
Ditto.
> +{
> + writel(val, lpp->app_base + ofs);
> +}
> +
> +static void pcie_app_wr_mask(struct intel_pcie_port *lpp,
> + u32 mask, u32 val, u32 ofs)
Ditto.
> +{
> + pcie_update_bits(lpp->app_base, mask, val, ofs);
> +}
> +
> +static inline u32 pcie_rc_cfg_rd(struct intel_pcie_port *lpp, u32 ofs)
> +{
> + return dw_pcie_readl_dbi(&lpp->pci, ofs);
> +}
> +
> +static inline void pcie_rc_cfg_wr(struct intel_pcie_port *lpp, u32 val, u32 ofs)
Ditto.
> +{
> + dw_pcie_writel_dbi(&lpp->pci, ofs, val);
> +}
> +
> +static void pcie_rc_cfg_wr_mask(struct intel_pcie_port *lpp,
> + u32 mask, u32 val, u32 ofs)
Ditto.
> +{
> + pcie_update_bits(lpp->pci.dbi_base, mask, val, ofs);
> +}
> +
> +static void intel_pcie_ltssm_enable(struct intel_pcie_port *lpp)
> +{
> + pcie_app_wr_mask(lpp, PCIE_APP_CCR_LTSSM_ENABLE,
> + PCIE_APP_CCR_LTSSM_ENABLE, PCIE_APP_CCR);
> +}
> +
> +static void intel_pcie_ltssm_disable(struct intel_pcie_port *lpp)
> +{
> + pcie_app_wr_mask(lpp, PCIE_APP_CCR_LTSSM_ENABLE, 0, PCIE_APP_CCR);
> +}
> +
> +static void intel_pcie_link_setup(struct intel_pcie_port *lpp)
> +{
> + u32 val;
> + u8 offset = lpp->pcie_cap_ofst;
> +
> + val = pcie_rc_cfg_rd(lpp, offset + PCI_EXP_LNKCAP);
> + lpp->max_speed = FIELD_GET(PCI_EXP_LNKCAP_SLS, val);
> + lpp->max_width = FIELD_GET(PCI_EXP_LNKCAP_MLW, val);
> +
> + val = pcie_rc_cfg_rd(lpp, offset + PCI_EXP_LNKCTL);
> +
> + val &= ~(PCI_EXP_LNKCTL_LD | PCI_EXP_LNKCTL_ASPMC);
> + pcie_rc_cfg_wr(lpp, val, offset + PCI_EXP_LNKCTL);
> +}
> +
> +static void intel_pcie_port_logic_setup(struct intel_pcie_port *lpp)
> +{
> + u32 val, mask;
> +
> + switch (pcie_link_speed[lpp->max_speed]) {
> + case PCIE_SPEED_8_0GT:
> + lpp->n_fts = PORT_AFR_N_FTS_GEN3;
> + break;
> + case PCIE_SPEED_16_0GT:
> + lpp->n_fts = PORT_AFR_N_FTS_GEN4;
> + break;
> + default:
> + lpp->n_fts = PORT_AFR_N_FTS_GEN12_DFT;
> + break;
> + }
> +
> + mask = PORT_AFR_N_FTS_MASK | PORT_AFR_CC_N_FTS_MASK;
> + val = FIELD_PREP(PORT_AFR_N_FTS_MASK, lpp->n_fts) |
> + FIELD_PREP(PORT_AFR_CC_N_FTS_MASK, lpp->n_fts);
> + pcie_rc_cfg_wr_mask(lpp, mask, val, PCIE_PORT_AFR);
> +
> + /* Port Link Control Register */
> + pcie_rc_cfg_wr_mask(lpp, PORT_LINK_DLL_LINK_EN,
> + PORT_LINK_DLL_LINK_EN, PCIE_PORT_LINK_CONTROL);
> +}
> +
> +static void intel_pcie_rc_setup(struct intel_pcie_port *lpp)
> +{
> + intel_pcie_ltssm_disable(lpp);
> + intel_pcie_link_setup(lpp);
> + dw_pcie_setup_rc(&lpp->pci.pp);
> + dw_pcie_upconfig_setup(&lpp->pci);
> + intel_pcie_port_logic_setup(lpp);
> + dw_pcie_link_set_max_speed(&lpp->pci, lpp->link_gen);
> + dw_pcie_link_set_n_fts(&lpp->pci, lpp->n_fts);
> +}
> +
> +static int intel_pcie_ep_rst_init(struct intel_pcie_port *lpp)
> +{
> + struct device *dev = lpp->pci.dev;
> + int ret;
> +
> + lpp->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
> + if (IS_ERR(lpp->reset_gpio)) {
> + ret = PTR_ERR(lpp->reset_gpio);
> + if (ret != -EPROBE_DEFER)
> + dev_err(dev, "failed to request PCIe GPIO: %d\n", ret);
> + return ret;
> + }
> +
> + /* Make initial reset last for 100us */
> + usleep_range(100, 200);
> +
> + return 0;
> +}
> +
> +static void intel_pcie_core_rst_assert(struct intel_pcie_port *lpp)
> +{
> + reset_control_assert(lpp->core_rst);
> +}
> +
> +static void intel_pcie_core_rst_deassert(struct intel_pcie_port *lpp)
> +{
> + /*
> + * One micro-second delay to make sure the reset pulse
> + * wide enough so that core reset is clean.
> + */
> + udelay(1);
> + reset_control_deassert(lpp->core_rst);
> +
> + /*
> + * Some SoC core reset also reset PHY, more delay needed
> + * to make sure the reset process is done.
> + */
> + usleep_range(1000, 2000);
> +}
> +
> +static void intel_pcie_device_rst_assert(struct intel_pcie_port *lpp)
> +{
> + gpiod_set_value_cansleep(lpp->reset_gpio, 1);
> +}
> +
> +static void intel_pcie_device_rst_deassert(struct intel_pcie_port *lpp)
> +{
> + msleep(lpp->rst_intrvl);
> + gpiod_set_value_cansleep(lpp->reset_gpio, 0);
> +}
> +
> +static int intel_pcie_app_logic_setup(struct intel_pcie_port *lpp)
> +{
> + intel_pcie_device_rst_deassert(lpp);
> + intel_pcie_ltssm_enable(lpp);
> +
> + return dw_pcie_wait_for_link(&lpp->pci);
> +}
> +
> +static void intel_pcie_core_irq_disable(struct intel_pcie_port *lpp)
> +{
> + pcie_app_wr(lpp, 0, PCIE_APP_IRNEN);
> + pcie_app_wr(lpp, PCIE_APP_IRN_INT, PCIE_APP_IRNCR);
> +}
> +
> +static int intel_pcie_get_resources(struct platform_device *pdev)
> +{
> + struct intel_pcie_port *lpp = platform_get_drvdata(pdev);
> + struct dw_pcie *pci = &lpp->pci;
> + struct device *dev = pci->dev;
> + struct resource *res;
> + int ret;
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
> + pci->dbi_base = devm_ioremap_resource(dev, res);
> + if (IS_ERR(pci->dbi_base))
> + return PTR_ERR(pci->dbi_base);
> +
> + lpp->core_clk = devm_clk_get(dev, NULL);
> + if (IS_ERR(lpp->core_clk)) {
> + ret = PTR_ERR(lpp->core_clk);
> + if (ret != -EPROBE_DEFER)
> + dev_err(dev, "failed to get clks: %d\n", ret);
> + return ret;
> + }
> +
> + lpp->core_rst = devm_reset_control_get(dev, NULL);
> + if (IS_ERR(lpp->core_rst)) {
> + ret = PTR_ERR(lpp->core_rst);
> + if (ret != -EPROBE_DEFER)
> + dev_err(dev, "failed to get resets: %d\n", ret);
> + return ret;
> + }
> +
> + ret = device_property_match_string(dev, "device_type", "pci");
> + if (ret) {
> + dev_err(dev, "failed to find pci device type: %d\n", ret);
> + return ret;
> + }
> +
> + if (device_property_read_u32(dev, "reset-assert-ms", &lpp->rst_intrvl))
I would rather use above pattern, i.e.
ret = device_property_read_u32(...);
if (ret)
...
> + lpp->rst_intrvl = RESET_INTERVAL_MS;
> +
> + ret = of_pci_get_max_link_speed(dev->of_node);
> + lpp->link_gen = ret < 0 ? 0 : ret;
> +
> + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "app");
> + lpp->app_base = devm_ioremap_resource(dev, res);
This can use newly introduced (c9c8641d3ebd)
devm_platform_ioremap_resource_byname() API, however it will require PCI
to merge an immutable branch (if any) from driver core.
> + if (IS_ERR(lpp->app_base))
> + return PTR_ERR(lpp->app_base);
> +
> + lpp->phy = devm_phy_get(dev, "pcie");
> + if (IS_ERR(lpp->phy)) {
> + ret = PTR_ERR(lpp->phy);
> + if (ret != -EPROBE_DEFER)
> + dev_err(dev, "couldn't get pcie-phy: %d\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static void intel_pcie_deinit_phy(struct intel_pcie_port *lpp)
> +{
> + phy_exit(lpp->phy);
> +}
> +
> +static int intel_pcie_wait_l2(struct intel_pcie_port *lpp)
> +{
> + u32 value;
> + int ret;
> +
> + if (pcie_link_speed[lpp->max_speed] < PCIE_SPEED_8_0GT)
> + return 0;
> +
> + /* Send PME_TURN_OFF message */
> + pcie_app_wr_mask(lpp, PCIE_APP_MSG_XMT_PM_TURNOFF,
> + PCIE_APP_MSG_XMT_PM_TURNOFF, PCIE_APP_MSG_CR);
> +
> + /* Read PMC status and wait for falling into L2 link state */
> + ret = readl_poll_timeout(lpp->app_base + PCIE_APP_PMC, value,
> + value & PCIE_APP_PMC_IN_L2, 20,
> + jiffies_to_usecs(5 * HZ));
> + if (ret)
> + dev_err(lpp->pci.dev, "PCIe link enter L2 timeout!\n");
> +
> + return ret;
> +}
> +
> +static void intel_pcie_turn_off(struct intel_pcie_port *lpp)
> +{
> + if (dw_pcie_link_up(&lpp->pci))
> + intel_pcie_wait_l2(lpp);
> +
> + /* Put endpoint device in reset state */
> + intel_pcie_device_rst_assert(lpp);
> + pcie_rc_cfg_wr_mask(lpp, PCI_COMMAND_MEMORY, 0, PCI_COMMAND);
> +}
> +
> +static int intel_pcie_host_setup(struct intel_pcie_port *lpp)
> +{
> + struct device *dev = lpp->pci.dev;
> + int ret;
> +
> + intel_pcie_core_rst_assert(lpp);
> + intel_pcie_device_rst_assert(lpp);
> +
> + ret = phy_init(lpp->phy);
> + if (ret)
> + return ret;
> +
> + intel_pcie_core_rst_deassert(lpp);
> +
> + ret = clk_prepare_enable(lpp->core_clk);
> + if (ret) {
> + dev_err(lpp->pci.dev, "Core clock enable failed: %d\n", ret);
> + goto clk_err;
> + }
> +
> + if (!lpp->pcie_cap_ofst) {
> + ret = dw_pcie_find_capability(&lpp->pci, PCI_CAP_ID_EXP);
> + if (!ret) {
> + ret = -ENXIO;
> + dev_err(dev, "Invalid PCIe capability offset\n");
> + goto app_init_err;
> + }
> +
> + lpp->pcie_cap_ofst = ret;
> + }
> +
> + intel_pcie_rc_setup(lpp);
> + ret = intel_pcie_app_logic_setup(lpp);
> + if (ret)
> + goto app_init_err;
> +
> + /* Enable integrated interrupts */
> + pcie_app_wr_mask(lpp, PCIE_APP_IRN_INT, PCIE_APP_IRN_INT,
> + PCIE_APP_IRNEN);
> + return 0;
> +
> +app_init_err:
> + clk_disable_unprepare(lpp->core_clk);
> +clk_err:
> + intel_pcie_core_rst_assert(lpp);
> + intel_pcie_deinit_phy(lpp);
> +
> + return ret;
> +}
> +
> +static void __intel_pcie_remove(struct intel_pcie_port *lpp)
> +{
> + intel_pcie_core_irq_disable(lpp);
> + intel_pcie_turn_off(lpp);
> + clk_disable_unprepare(lpp->core_clk);
> + intel_pcie_core_rst_assert(lpp);
> + intel_pcie_deinit_phy(lpp);
> +}
> +
> +static int intel_pcie_remove(struct platform_device *pdev)
> +{
> + struct intel_pcie_port *lpp = platform_get_drvdata(pdev);
> + struct pcie_port *pp = &lpp->pci.pp;
> +
> + dw_pcie_host_deinit(pp);
> + __intel_pcie_remove(lpp);
> +
> + return 0;
> +}
> +
> +static int __maybe_unused intel_pcie_suspend_noirq(struct device *dev)
> +{
> + struct intel_pcie_port *lpp = dev_get_drvdata(dev);
> + int ret;
> +
> + intel_pcie_core_irq_disable(lpp);
> + ret = intel_pcie_wait_l2(lpp);
> + if (ret)
> + return ret;
> +
> + intel_pcie_deinit_phy(lpp);
> + clk_disable_unprepare(lpp->core_clk);
> + return ret;
> +}
> +
> +static int __maybe_unused intel_pcie_resume_noirq(struct device *dev)
> +{
> + struct intel_pcie_port *lpp = dev_get_drvdata(dev);
> +
> + return intel_pcie_host_setup(lpp);
> +}
> +
> +static int intel_pcie_rc_init(struct pcie_port *pp)
> +{
> + struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> + struct intel_pcie_port *lpp = dev_get_drvdata(pci->dev);
> +
> + return intel_pcie_host_setup(lpp);
> +}
> +
> +int intel_pcie_msi_init(struct pcie_port *pp)
> +{
> + /* PCIe MSI/MSIx is handled by MSI in x86 processor */
> + return 0;
> +}
> +
> +u64 intel_pcie_cpu_addr(struct dw_pcie *pcie, u64 cpu_addr)
> +{
> + return cpu_addr + BUS_IATU_OFFSET;
> +}
> +
> +static const struct dw_pcie_ops intel_pcie_ops = {
> + .cpu_addr_fixup = intel_pcie_cpu_addr,
> +};
> +
> +static const struct dw_pcie_host_ops intel_pcie_dw_ops = {
> + .host_init = intel_pcie_rc_init,
> + .msi_host_init = intel_pcie_msi_init,
> +};
> +
> +static const struct intel_pcie_soc pcie_data = {
> + .pcie_ver = 0x520A,
> + .pcie_atu_offset = 0xC0000,
> + .num_viewport = 3,
> +};
> +
> +static int intel_pcie_probe(struct platform_device *pdev)
> +{
> + const struct intel_pcie_soc *data;
> + struct device *dev = &pdev->dev;
> + struct intel_pcie_port *lpp;
> + struct pcie_port *pp;
> + struct dw_pcie *pci;
> + int ret;
> +
> + lpp = devm_kzalloc(dev, sizeof(*lpp), GFP_KERNEL);
> + if (!lpp)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, lpp);
> + pci = &lpp->pci;
> + pci->dev = dev;
> + pp = &pci->pp;
> +
> + ret = intel_pcie_get_resources(pdev);
> + if (ret)
> + return ret;
> +
> + ret = intel_pcie_ep_rst_init(lpp);
> + if (ret)
> + return ret;
> +
> + data = device_get_match_data(dev);
> + if (!data)
> + return -ENODEV;
> +
> + pci->ops = &intel_pcie_ops;
> + pci->version = data->pcie_ver;
> + pci->atu_base = pci->dbi_base + data->pcie_atu_offset;
> + pp->ops = &intel_pcie_dw_ops;
> +
> + ret = dw_pcie_host_init(pp);
> + if (ret) {
> + dev_err(dev, "cannot initialize host\n");
> + return ret;
> + }
> +
> + /*
> + * Intel PCIe doesn't configure IO region, so set viewport
> + * to not to perform IO region access.
> + */
> + pci->num_viewport = data->num_viewport;
> +
> + dev_info(dev, "Intel PCIe Root Complex Port init done\n");
> +
> + return ret;
> +}
> +
> +static const struct dev_pm_ops intel_pcie_pm_ops = {
> + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(intel_pcie_suspend_noirq,
> + intel_pcie_resume_noirq)
> +};
> +
> +static const struct of_device_id of_intel_pcie_match[] = {
> + { .compatible = "intel,lgm-pcie", .data = &pcie_data },
> + {}
> +};
> +
> +static struct platform_driver intel_pcie_driver = {
> + .probe = intel_pcie_probe,
> + .remove = intel_pcie_remove,
> + .driver = {
> + .name = "intel-gw-pcie",
> + .of_match_table = of_intel_pcie_match,
> + .pm = &intel_pcie_pm_ops,
> + },
> +};
> +builtin_platform_driver(intel_pcie_driver);
> diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
> index 29d6e93fd15e..548e22e07a52 100644
> --- a/include/uapi/linux/pci_regs.h
> +++ b/include/uapi/linux/pci_regs.h
> @@ -673,6 +673,7 @@
> #define PCI_EXP_LNKCTL2_TLS_8_0GT 0x0003 /* Supported Speed 8GT/s */
> #define PCI_EXP_LNKCTL2_TLS_16_0GT 0x0004 /* Supported Speed 16GT/s */
> #define PCI_EXP_LNKCTL2_TLS_32_0GT 0x0005 /* Supported Speed 32GT/s */
> +#define PCI_EXP_LNKCTL2_HASD 0x0020 /* HW Autonomous Speed Disable */
> #define PCI_EXP_LNKSTA2 50 /* Link Status 2 */
> #define PCI_CAP_EXP_ENDPOINT_SIZEOF_V2 52 /* v2 endpoints with link end here */
> #define PCI_EXP_SLTCAP2 52 /* Slot Capabilities 2 */
> --
> 2.11.0
>
--
With Best Regards,
Andy Shevchenko
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