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Date: Wed, 25 Oct 2017 13:42:49 -0400
From: Jim Quinlan <jim2101024@...il.com>
To: Bjorn Helgaas <helgaas@...nel.org>
Cc: linux-kernel@...r.kernel.org,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Rob Herring <robh+dt@...nel.org>,
Brian Norris <computersforpeace@...il.com>,
Russell King <rmk+kernel@...linux.org.uk>,
Robin Murphy <robin.murphy@....com>,
Christoph Hellwig <hch@....de>,
Florian Fainelli <f.fainelli@...il.com>,
Mark Rutland <mark.rutland@....com>,
devicetree@...r.kernel.org, Linux-MIPS <linux-mips@...ux-mips.org>,
linux-pci <linux-pci@...r.kernel.org>,
Kevin Cernekee <cernekee@...il.com>,
Ralf Baechle <ralf@...ux-mips.org>,
bcm-kernel-feedback-list <bcm-kernel-feedback-list@...adcom.com>,
Gregory Fong <gregory.0xf0@...il.com>,
Bjorn Helgaas <bhelgaas@...gle.com>,
linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 3/8] PCI: host: brcmstb: Broadcom PCIe Host Controller
On Tue, Oct 24, 2017 at 5:15 PM, Bjorn Helgaas <helgaas@...nel.org> wrote:
> Run "git log --oneline drivers/pci/host" and make yours match, e.g.,
>
> s/PCI: host: brcmstb: Broadcom PCIe Host Controller/
> PCI: brcmstb: Add Broadcom STB PCIe host controller driver/
>
> On Tue, Oct 24, 2017 at 02:15:44PM -0400, Jim Quinlan wrote:
>> This commit adds the basic Broadcom STB PCIe controller. Missing is
>> the ability to process MSI and also handle dma-ranges for inbound
>> memory accesses. These two functionalities are added in subsequent
>> commits.http://stb-bld-00.broadcom.com/gitweb/ejtag.git/blob/d526f31b497072fc2a311e25700957753479cebc:/app/bbsserver/bbsserver/wf_mem.c
>>http://stb-bld-00.broadcom.com/gitweb/ejtag.git/blob/d526f31b497072fc2a311e25700957753479cebc:/app/bbsserver/bbsserver/wf_mem.c
>> The PCIe block contains an MDIO interface. This is a local interface
>> only accessible by the PCIe controller. It cannot be used or shared
>> by any other HW. As such, the small amount of code for this
>> controller is included in this driver as there is little upside to put
>> it elsewhere.
>>
>> Signed-off-by: Jim Quinlan <jim2101024@...il.com>
>> ---
>> drivers/pci/host/Kconfig | 8 +
>> drivers/pci/host/Makefile | 1 +
>> drivers/pci/host/pci-brcmstb.c | 1195 ++++++++++++++++++++++++++++++++++++++++
>
> Name this pcie-brcmstb.c. I used to have the idea we should name
> things "pci-" unless they explicitly used some PCIe interfaces or
> something, but I think that just made it confusing for PCIe
> controllers like yours.
>
>> drivers/pci/host/pci-brcmstb.h | 33 ++
>
> Unless you need this include file elsewhere, just fold its contents
> into the .c file.
There are three .c files, and one .h file. There should only be
things in the include file that are needed by at least two of the .c
files. I'll check this and move anything that is only used by one
file.
>
>> 4 files changed, 1237 insertions(+)
>> create mode 100644 drivers/pci/host/pci-brcmstb.c
>> create mode 100644 drivers/pci/host/pci-brcmstb.h
>>
>> diff --git a/drivers/pci/host/Kconfig b/drivers/pci/host/Kconfig
>> index b868803..b9b4f11 100644
>> --- a/drivers/pci/host/Kconfig
>> +++ b/drivers/pci/host/Kconfig
>> @@ -220,4 +220,12 @@ config VMD
>> To compile this driver as a module, choose M here: the
>> module will be called vmd.
>>
>> +config PCI_BRCMSTB
>
> PCIE_BRCMSTB
>
>> + tristate "Broadcom Brcmstb PCIe platform host driver"
>> + depends on ARCH_BRCMSTB || BMIPS_GENERIC
>> + depends on OF
>> + depends on SOC_BRCMSTB
>> + default ARCH_BRCMSTB || BMIPS_GENERIC
>> + help
>> + Adds support for Broadcom Settop Box PCIe host controller.
>> endmenu
>> diff --git a/drivers/pci/host/Makefile b/drivers/pci/host/Makefile
>> index 1238278..4398d2c 100644
>> --- a/drivers/pci/host/Makefile
>> +++ b/drivers/pci/host/Makefile
>> @@ -21,6 +21,7 @@ obj-$(CONFIG_PCIE_ROCKCHIP) += pcie-rockchip.o
>> obj-$(CONFIG_PCIE_MEDIATEK) += pcie-mediatek.o
>> obj-$(CONFIG_PCIE_TANGO_SMP8759) += pcie-tango.o
>> obj-$(CONFIG_VMD) += vmd.o
>> +obj-$(CONFIG_PCI_BRCMSTB) += pci-brcmstb.o
>>
>> # The following drivers are for devices that use the generic ACPI
>> # pci_root.c driver but don't support standard ECAM config access.
>> diff --git a/drivers/pci/host/pci-brcmstb.c b/drivers/pci/host/pci-brcmstb.c
>> new file mode 100644
>> index 0000000..883b435
>> --- /dev/null
>> +++ b/drivers/pci/host/pci-brcmstb.c
>> @@ -0,0 +1,1195 @@
>> +/*
>> + * Copyright (C) 2009 - 2017 Broadcom
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License for more details.
>> + */
>> +#include <linux/clk.h>
>> +#include <linux/compiler.h>
>> +#include <linux/delay.h>
>> +#include <linux/init.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/io.h>
>> +#include <linux/ioport.h>
>> +#include <linux/irqdomain.h>
>> +#include <linux/kernel.h>
>> +#include <linux/list.h>
>> +#include <linux/log2.h>
>> +#include <linux/module.h>
>> +#include <linux/of_address.h>
>> +#include <linux/of_irq.h>
>> +#include <linux/of_pci.h>
>> +#include <linux/of_pci.h>
>> +#include <linux/of_platform.h>
>> +#include <linux/pci.h>
>> +#include <linux/printk.h>
>> +#include <linux/regulator/consumer.h>
>> +#include <linux/sizes.h>
>> +#include <linux/slab.h>
>> +#include <soc/brcmstb/memory_api.h>
>> +#include <linux/string.h>
>> +#include <linux/types.h>
>> +#include "pci-brcmstb.h"
>> +
>> +/* Broadcom Settop Box PCIE Register Offsets. */
>
> s/PCIE/PCIe/ in comments and other English text throughout.
>
>> +#define PCIE_RC_CFG_PCIE_LINK_CAPABILITY 0x00b8
>> +#define PCIE_RC_CFG_PCIE_LINK_STATUS_CONTROL 0x00bc
>> +#define PCIE_RC_CFG_PCIE_ROOT_CAP_CONTROL 0x00c8
>> +#define PCIE_RC_CFG_PCIE_LINK_STATUS_CONTROL_2 0x00dc
>
> Many of these look like they are describing the PCIe capability. If
> so, please define a Broadcom-specific base and use the already-defined
> constants from include/uapi/linux/pci_regs.h, e.g., PCI_EXP_LNKCAP,
> etc.
>
>> +#define PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1 0x0188
>> +#define PCIE_RC_CFG_PRIV1_ID_VAL3 0x043c
>> +#define PCIE_RC_DL_MDIO_ADDR 0x1100
>> +#define PCIE_RC_DL_MDIO_WR_DATA 0x1104
>> +#define PCIE_RC_DL_MDIO_RD_DATA 0x1108
>> +#define PCIE_MISC_MISC_CTRL 0x4008
>> +#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO 0x400c
>> +#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_HI 0x4010
>> +#define PCIE_MISC_RC_BAR1_CONFIG_LO 0x402c
>> +#define PCIE_MISC_RC_BAR1_CONFIG_HI 0x4030
>> +#define PCIE_MISC_RC_BAR2_CONFIG_LO 0x4034
>> +#define PCIE_MISC_RC_BAR2_CONFIG_HI 0x4038
>> +#define PCIE_MISC_RC_BAR3_CONFIG_LO 0x403c
>> +#define PCIE_MISC_RC_BAR3_CONFIG_HI 0x4040
>> +#define PCIE_MISC_PCIE_CTRL 0x4064
>> +#define PCIE_MISC_PCIE_STATUS 0x4068
>> +#define PCIE_MISC_REVISION 0x406c
>> +#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT 0x4070
>> +#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI 0x4080
>> +#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI 0x4084
>> +#define PCIE_MISC_HARD_PCIE_HARD_DEBUG 0x4204
>> +
>> +/* Broadcom Settop Box PCIE Register Field Shift, Mask Info. */
>> +#define PCIE_RC_CFG_PCIE_LINK_STATUS_CONTROL_NEG_LINK_WIDTH_MASK 0x3f00000
>
> Looks suspiciously like PCI_EXP_LNKSTA_NLW.
The #define symbols I use are machine generated by the RDB tools.
Everytime a new chip comes out, I run
a script that checks that the register offsets have not changed as
compared to our driver (as sometimes they do).
If I start using other names for constants I will probably lose this ability.
>
>> +#define PCIE_RC_CFG_PCIE_LINK_STATUS_CONTROL_NEG_LINK_WIDTH_SHIFT 0x14
>> +#define PCIE_RC_CFG_PCIE_LINK_STATUS_CONTROL_NEG_LINK_SPEED_MASK 0xf0000
>> +#define PCIE_RC_CFG_PCIE_LINK_STATUS_CONTROL_NEG_LINK_SPEED_SHIFT 0x10
>> +#define PCIE_RC_CFG_PCIE_LINK_CAPABILITY_MAX_LINK_SPEED_MASK 0xf
>> +#define PCIE_RC_CFG_PCIE_LINK_CAPABILITY_MAX_LINK_SPEED_SHIFT 0x0
>> +#define PCIE_RC_CFG_PCIE_ROOT_CAP_CONTROL_RC_CRS_EN_MASK 0x10
>> +#define PCIE_RC_CFG_PCIE_ROOT_CAP_CONTROL_RC_CRS_EN_SHIFT 0x4
>> +#define PCIE_RC_CFG_PCIE_LINK_STATUS_CONTROL_2_TARGET_LINK_SPEED_MASK 0xf
>> +#define PCIE_RC_CFG_PCIE_LINK_STATUS_CONTROL_2_TARGET_LINK_SPEED_SHIFT 0x0
>> +#define PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1_ENDIAN_MODE_BAR1_MASK 0x3
>> +#define PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1_ENDIAN_MODE_BAR1_SHIFT 0x0
>> +#define PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1_ENDIAN_MODE_BAR2_MASK 0xc
>> +#define PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1_ENDIAN_MODE_BAR2_SHIFT 0x2
>> +#define PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1_ENDIAN_MODE_BAR3_MASK 0x30
>> +#define PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1_ENDIAN_MODE_BAR3_SHIFT 0x4
>> +#define PCIE_RC_CFG_PRIV1_ID_VAL3_CLASS_CODE_MASK 0xffffff
>> +#define PCIE_RC_CFG_PRIV1_ID_VAL3_CLASS_CODE_SHIFT 0x0
>> +#define PCIE_MISC_MISC_CTRL_SCB_ACCESS_EN_MASK 0x1000
>> +#define PCIE_MISC_MISC_CTRL_SCB_ACCESS_EN_SHIFT 0xc
>> +#define PCIE_MISC_MISC_CTRL_CFG_READ_UR_MODE_MASK 0x2000
>> +#define PCIE_MISC_MISC_CTRL_CFG_READ_UR_MODE_SHIFT 0xd
>> +#define PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_MASK 0x300000
>> +#define PCIE_MISC_MISC_CTRL_MAX_BURST_SIZE_SHIFT 0x14
>> +#define PCIE_MISC_MISC_CTRL_SCB0_SIZE_MASK 0xf8000000
>> +#define PCIE_MISC_MISC_CTRL_SCB0_SIZE_SHIFT 0x1b
>> +#define PCIE_MISC_MISC_CTRL_SCB1_SIZE_MASK 0x7c00000
>> +#define PCIE_MISC_MISC_CTRL_SCB1_SIZE_SHIFT 0x16
>> +#define PCIE_MISC_MISC_CTRL_SCB2_SIZE_MASK 0x1f
>> +#define PCIE_MISC_MISC_CTRL_SCB2_SIZE_SHIFT 0x0
>> +#define PCIE_MISC_RC_BAR1_CONFIG_LO_MATCH_ADDRESS_MASK 0xfffff000
>> +#define PCIE_MISC_RC_BAR1_CONFIG_LO_MATCH_ADDRESS_SHIFT 0xc
>> +#define PCIE_MISC_RC_BAR1_CONFIG_LO_SIZE_MASK 0x1f
>> +#define PCIE_MISC_RC_BAR1_CONFIG_LO_SIZE_SHIFT 0x0
>> +#define PCIE_MISC_RC_BAR2_CONFIG_LO_MATCH_ADDRESS_MASK 0xfffff000
>> +#define PCIE_MISC_RC_BAR2_CONFIG_LO_MATCH_ADDRESS_SHIFT 0xc
>> +#define PCIE_MISC_RC_BAR2_CONFIG_LO_SIZE_MASK 0x1f
>> +#define PCIE_MISC_RC_BAR2_CONFIG_LO_SIZE_SHIFT 0x0
>> +#define PCIE_MISC_RC_BAR3_CONFIG_LO_MATCH_ADDRESS_MASK 0xfffff000
>> +#define PCIE_MISC_RC_BAR3_CONFIG_LO_MATCH_ADDRESS_SHIFT 0xc
>> +#define PCIE_MISC_RC_BAR3_CONFIG_LO_SIZE_MASK 0x1f
>> +#define PCIE_MISC_RC_BAR3_CONFIG_LO_SIZE_SHIFT 0x0
>> +#define PCIE_MISC_PCIE_CTRL_PCIE_PERSTB_MASK 0x4
>> +#define PCIE_MISC_PCIE_CTRL_PCIE_PERSTB_SHIFT 0x2
>> +#define PCIE_MISC_PCIE_CTRL_PCIE_L23_REQUEST_MASK 0x1
>> +#define PCIE_MISC_PCIE_CTRL_PCIE_L23_REQUEST_SHIFT 0x0
>> +#define PCIE_MISC_PCIE_STATUS_PCIE_PORT_MASK 0x80
>> +#define PCIE_MISC_PCIE_STATUS_PCIE_PORT_SHIFT 0x7
>> +#define PCIE_MISC_PCIE_STATUS_PCIE_DL_ACTIVE_MASK 0x20
>> +#define PCIE_MISC_PCIE_STATUS_PCIE_DL_ACTIVE_SHIFT 0x5
>> +#define PCIE_MISC_PCIE_STATUS_PCIE_PHYLINKUP_MASK 0x10
>> +#define PCIE_MISC_PCIE_STATUS_PCIE_PHYLINKUP_SHIFT 0x4
>> +#define PCIE_MISC_PCIE_STATUS_PCIE_LINK_IN_L23_MASK 0x40
>> +#define PCIE_MISC_PCIE_STATUS_PCIE_LINK_IN_L23_SHIFT 0x6
>> +#define PCIE_MISC_REVISION_MAJMIN_MASK 0xffff
>> +#define PCIE_MISC_REVISION_MAJMIN_SHIFT 0
>> +#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_LIMIT_MASK 0xfff00000
>> +#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_LIMIT_SHIFT 0x14
>> +#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_BASE_MASK 0xfff0
>> +#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_BASE_SHIFT 0x4
>> +#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_NUM_MASK_BITS 0xc
>> +#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI_BASE_MASK 0xff
>> +#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI_BASE_SHIFT 0x0
>> +#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI_LIMIT_MASK 0xff
>> +#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI_LIMIT_SHIFT 0x0
>> +#define PCIE_MISC_HARD_PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_MASK 0x2
>> +#define PCIE_MISC_HARD_PCIE
>> +#define PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK 0x08000000
>> +#define PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_SHIFT 0x1b
>> +#define PCIE_RGR1_SW_INIT_1_PERST_MASK 0x1
>> +#define PCIE_RGR1_SW_INIT_1_PERST_SHIFT 0x0
>
> Many of these definitions aren't used, and I'm dubious about the value
> of including them all
I will remove those that are not being used.
>
>> +#define BRCM_NUM_PCI_OUT_WINS 0x4
>> +#define BRCM_MAX_SCB 0x4
>> +
>> +#define BRCM_MSI_TARGET_ADDR_LT_4GB 0x0fffffffcULL
>> +#define BRCM_MSI_TARGET_ADDR_GT_4GB 0xffffffffcULL
>> +
>> +#define BURST_SIZE_128 0
>> +#define BURST_SIZE_256 1
>> +#define BURST_SIZE_512 2
>> +
>> +/* Offsets from PCIE_INTR2_CPU_BASE */
>> +#define STATUS 0x0
>> +#define SET 0x4
>> +#define CLR 0x8
>> +#define MASK_STATUS 0xc
>> +#define MASK_SET 0x10
>> +#define MASK_CLR 0x14
>> +
>> +#define PCI_BUSNUM_SHIFT 20
>> +#define PCI_SLOT_SHIFT 15
>> +#define PCI_FUNC_SHIFT 12
>> +
>> +#if defined(__BIG_ENDIAN)
>> +#define DATA_ENDIAN 2 /* PCI->DDR inbound accesses */
>> +#define MMIO_ENDIAN 2 /* CPU->PCI outbound accesses */
>> +#else
>> +#define DATA_ENDIAN 0
>> +#define MMIO_ENDIAN 0
>> +#endif
>> +
>> +#define MDIO_PORT0 0x0
>> +#define MDIO_DATA_MASK 0x7fffffff
>> +#define MDIO_DATA_SHIFT 0x0
>> +#define MDIO_PORT_MASK 0xf0000
>> +#define MDIO_PORT_SHIFT 0x16
>> +#define MDIO_REGAD_MASK 0xffff
>> +#define MDIO_REGAD_SHIFT 0x0
>> +#define MDIO_CMD_MASK 0xfff00000
>> +#define MDIO_CMD_SHIFT 0x14
>> +#define MDIO_CMD_READ 0x1
>> +#define MDIO_CMD_WRITE 0x0
>> +#define MDIO_DATA_DONE_MASK 0x80000000
>> +#define MDIO_RD_DONE(x) (((x) & MDIO_DATA_DONE_MASK) ? 1 : 0)
>> +#define MDIO_WT_DONE(x) (((x) & MDIO_DATA_DONE_MASK) ? 0 : 1)
>> +#define SSC_REGS_ADDR 0x1100
>> +#define SET_ADDR_OFFSET 0x1f
>> +#define SSC_CNTL_OFFSET 0x2
>> +#define SSC_CNTL_OVRD_EN_MASK 0x8000
>> +#define SSC_CNTL_OVRD_EN_SHIFT 0xf
>> +#define SSC_CNTL_OVRD_VAL_MASK 0x4000
>> +#define SSC_CNTL_OVRD_VAL_SHIFT 0xe
>> +#define SSC_STATUS_OFFSET 0x1
>> +#define SSC_STATUS_SSC_MASK 0x400
>> +#define SSC_STATUS_SSC_SHIFT 0xa
>> +#define SSC_STATUS_PLL_LOCK_MASK 0x800
>> +#define SSC_STATUS_PLL_LOCK_SHIFT 0xb
>> +
>> +#define IDX_ADDR(pcie) \
>> + ((pcie)->reg_offsets[EXT_CFG_INDEX])
>> +#define DATA_ADDR(pcie) \
>> + ((pcie)->reg_offsets[EXT_CFG_DATA])
>> +#define PCIE_RGR1_SW_INIT_1(pcie) \
>> + ((pcie)->reg_offsets[RGR1_SW_INIT_1])
>> +
>> +enum {
>> + RGR1_SW_INIT_1,
>> + EXT_CFG_INDEX,
>> + EXT_CFG_DATA,
>> +};
>> +
>> +enum {
>> + RGR1_SW_INIT_1_INIT_MASK,
>> + RGR1_SW_INIT_1_INIT_SHIFT,
>> + RGR1_SW_INIT_1_PERST_MASK,
>> + RGR1_SW_INIT_1_PERST_SHIFT,
>> +};
>> +
>> +enum pcie_type {
>> + BCM7425,
>> + BCM7435,
>> + GENERIC,
>> + BCM7278,
>> +};
>> +
>> +#define RD_FLD(base, reg, field) \
>> + rd_fld(base + reg, reg##_##field##_MASK, reg##_##field##_SHIFT)
>> +#define WR_FLD(base, reg, field, val) \
>> + wr_fld(base + reg, reg##_##field##_MASK, reg##_##field##_SHIFT, val)
>> +#define WR_FLD_RB(base, reg, field, val) \
>> + wr_fld_rb(base + reg, reg##_##field##_MASK, reg##_##field##_SHIFT, val)
>> +#define WR_FLD_WITH_OFFSET(base, off, reg, field, val) \
>> + wr_fld(base + reg + off, reg##_##field##_MASK, \
>> + reg##_##field##_SHIFT, val)
>> +#define EXTRACT_FIELD(val, reg, field) \
>> + ((val & reg##_##field##_MASK) >> reg##_##field##_SHIFT)
>> +#define INSERT_FIELD(val, reg, field, field_val) \
>> + ((val & ~reg##_##field##_MASK) | \
>> + (reg##_##field##_MASK & (field_val << reg##_##field##_SHIFT)))
>> +
>> +struct pcie_cfg_data {
>> + const int *reg_field_info;
>> + const int *offsets;
>> + const enum pcie_type type;
>> +};
>> +
>> +static const int pcie_reg_field_info[] = {
>> + [RGR1_SW_INIT_1_INIT_MASK] = 0x2,
>> + [RGR1_SW_INIT_1_INIT_SHIFT] = 0x1,
>> +};
>> +
>> +static const int pcie_reg_field_info_bcm7278[] = {
>> + [RGR1_SW_INIT_1_INIT_MASK] = 0x1,
>> + [RGR1_SW_INIT_1_INIT_SHIFT] = 0x0,
>> +};
>> +
>> +static const int pcie_offset_bcm7425[] = {
>> + [RGR1_SW_INIT_1] = 0x8010,
>> + [EXT_CFG_INDEX] = 0x8300,
>> + [EXT_CFG_DATA] = 0x8304,
>> +};
>> +
>> +static const struct pcie_cfg_data bcm7425_cfg = {
>> + .reg_field_info = pcie_reg_field_info,
>> + .offsets = pcie_offset_bcm7425,
>> + .type = BCM7425,
>> +};
>> +
>> +static const int pcie_offsets[] = {
>> + [RGR1_SW_INIT_1] = 0x9210,
>> + [EXT_CFG_INDEX] = 0x9000,
>> + [EXT_CFG_DATA] = 0x9004,
>> +};
>> +
>> +static const struct pcie_cfg_data bcm7435_cfg = {
>> + .reg_field_info = pcie_reg_field_info,
>> + .offsets = pcie_offsets,
>> + .type = BCM7435,
>> +};
>> +
>> +static const struct pcie_cfg_data generic_cfg = {
>> + .reg_field_info = pcie_reg_field_info,
>> + .offsets = pcie_offsets,
>> + .type = GENERIC,
>> +};
>> +
>> +static const int pcie_offset_bcm7278[] = {
>> + [RGR1_SW_INIT_1] = 0xc010,
>> + [EXT_CFG_INDEX] = 0x9000,
>> + [EXT_CFG_DATA] = 0x9004,
>> +};
>> +
>> +static const struct pcie_cfg_data bcm7278_cfg = {
>> + .reg_field_info = pcie_reg_field_info_bcm7278,
>> + .offsets = pcie_offset_bcm7278,
>> + .type = BCM7278,
>> +};
>> +
>> +static void __iomem *brcm_pci_map_cfg(struct pci_bus *bus, unsigned int devfn,
>> + int where);
>> +
>> +static struct pci_ops brcm_pci_ops = {
>> + .map_bus = brcm_pci_map_cfg,
>> + .read = pci_generic_config_read32,
>> + .write = pci_generic_config_write32,
>
> Ouch, does your hardware really not support 8- and 16-bit config
> accesses? As you probably know, that can lead to config space
> corruption with devices that have RW1C bits in registers.
>
Our hardware can access 8/16/32 and I was going to modify this at a
later time. As you requested it I will do it with the next patchset
version.
>> +};
>> +
>> +struct brcm_dev_pwr_supply {
>> + struct list_head node;
>> + char name[32];
>> + struct regulator *regulator;
>> +};
>> +
>> +struct brcm_window {
>> + dma_addr_t pci_addr;
>> + phys_addr_t cpu_addr;
>> + dma_addr_t size;
>> +};
>> +
>> +/* Internal Bus Controller Information.*/
>> +struct brcm_pcie {
>> + struct list_head list;
>> + void __iomem *base;
>> + char name[BRCM_PCIE_NAME_SIZE];
>> + bool suspended;
>> + struct clk *clk;
>> + struct device_node *dn;
>> + int irq;
>> + int num_out_wins;
>> + bool ssc;
>> + int gen;
>> + struct brcm_window out_wins[BRCM_NUM_PCI_OUT_WINS];
>> + struct list_head resources;
>> + struct device *dev;
>> + struct list_head pwr_supplies;
>> + unsigned int rev;
>> + unsigned int num;
>> + bool bridge_setup_done;
>
> Nobody else needs a "bridge_setup_done" variable; I'm skeptical that
> you do. Please use similar style to other drivers whenever possible.
I will investigate and remove if possible.
>
>> + const int *reg_offsets;
>> + const int *reg_field_info;
>> + enum pcie_type type;
>> + struct pci_bus *root_bus;
>> + int id;
>
> Please reorder with more generic info at the top, e.g., "* dev",
> "*base", "resources", etc., should be near the top, as other drivers
> do.
>
>> +};
>> +
>> +static struct list_head brcm_pcie = LIST_HEAD_INIT(brcm_pcie);
>
> Do you really need a list of controllers? It looks like this is only
> used for remove. If you get rid of the list, you probably don't need
> brcm_pcie_lock either.
We've had chips with three RC controllers. There is a structure --
dma_ranges -- which is kzalloc'd and is shared by the controllers.
The first controller born and the last controller removed does the
alloc/free. Similarly, we need to coordinate adding/removing
tContrary urhe pci bus notifier. I'm not sure how this can be done
w/o an array/list.
>
>> +static phys_addr_t scb_size[BRCM_MAX_SCB];
>> +static int num_memc;
>> +static DEFINE_MUTEX(brcm_pcie_lock);
>> +
>> +/*
>> + * The roundup_pow_of_two() from log2.h invokes
>> + * __roundup_pow_of_two(unsigned long), but we really need a
>> + * such a function to take a native u64 since unsigned long
>> + * is 32 bits on some configurations. So we provide this helper
>> + * function below.
>> + */
>> +static u64 roundup_pow_of_two_64(u64 n)
>> +{
>> + return 1ULL << fls64(n - 1);
>> +}
>> +
>> +static int brcm_pcie_add_controller(struct brcm_pcie *pcie)
>> +{
>> + mutex_lock(&brcm_pcie_lock);
>> + snprintf(pcie->name, sizeof(pcie->name) - 1, "PCIe%d", pcie->id);
>> + list_add_tail(&pcie->list, &brcm_pcie);
>> + mutex_unlock(&brcm_pcie_lock);
>> +
>> + return 0;
>> +}
>> +
>> +static void brcm_pcie_remove_controller(struct brcm_pcie *pcie)
>> +{
>> + struct list_head *pos, *q;
>> + struct brcm_pcie *tmp;
>> +
>> + mutex_lock(&brcm_pcie_lock);
>> + list_for_each_safe(pos, q, &brcm_pcie) {
>> + tmp = list_entry(pos, struct brcm_pcie, list);
>> + if (tmp == pcie) {
>> + list_del(pos);
>> + if (list_empty(&brcm_pcie))
>> + num_memc = 0;
>> + break;
>> + }
>> + }
>> + mutex_unlock(&brcm_pcie_lock);
>> +}
>> +
>> +/* This is to convert the size of the inbound bar region to the
>> + * non-liniear values of PCIE_X_MISC_RC_BAR[123]_CONFIG_LO.SIZE
>
> Please use conventional comment style for multi-line comments, i.e.,
>
> /*
> * text ...
> */
>
>> + */
>> +int encode_ibar_size(u64 size)
>> +{
>> + int log2_in = ilog2(size);
>> +
>> + if (log2_in >= 12 && log2_in <= 15)
>> + /* Covers 4KB to 32KB (inclusive) */
>> + return (log2_in - 12) + 0x1c;
>> + else if (log2_in >= 16 && log2_in <= 37)
>> + /* Covers 64KB to 32GB, (inclusive) */
>> + return log2_in - 15;
>> + /* Something is awry so disable */
>> + return 0;
>> +}
>> +
>> +static u32 mdio_form_pkt(int port, int regad, int cmd)
>> +{
>> + u32 pkt = 0;
>> +
>> + pkt |= (port << MDIO_PORT_SHIFT) & MDIO_PORT_MASK;
>> + pkt |= (regad << MDIO_REGAD_SHIFT) & MDIO_REGAD_MASK;
>> + pkt |= (cmd << MDIO_CMD_SHIFT) & MDIO_CMD_MASK;
>> +
>> + return pkt;
>> +}
>> +
>> +/* negative return value indicates error */
>> +static int mdio_read(void __iomem *base, u8 port, u8 regad)
>> +{
>> + int tries;
>> + u32 data;
>> +
>> + bcm_writel(mdio_form_pkt(port, regad, MDIO_CMD_READ),
>> + base + PCIE_RC_DL_MDIO_ADDR);
>> + bcm_readl(base + PCIE_RC_DL_MDIO_ADDR);
>> +
>> + data = bcm_readl(base + PCIE_RC_DL_MDIO_RD_DATA);
>> + for (tries = 0; !MDIO_RD_DONE(data) && tries < 10; tries++) {
>> + udelay(10);
>> + data = bcm_readl(base + PCIE_RC_DL_MDIO_RD_DATA);
>> + }
>> +
>> + return MDIO_RD_DONE(data)
>> + ? (data & MDIO_DATA_MASK) >> MDIO_DATA_SHIFT
>> + : -EIO;
>> +}
>> +
>> +/* negative return value indicates error */
>> +static int mdio_write(void __iomem *base, u8 port, u8 regad, u16 wrdata)
>> +{
>> + int tries;
>> + u32 data;
>> +
>> + bcm_writel(mdio_form_pkt(port, regad, MDIO_CMD_WRITE),
>> + base + PCIE_RC_DL_MDIO_ADDR);
>> + bcm_readl(base + PCIE_RC_DL_MDIO_ADDR);
>> + bcm_writel(MDIO_DATA_DONE_MASK | wrdata,
>> + base + PCIE_RC_DL_MDIO_WR_DATA);
>> +
>> + data = bcm_readl(base + PCIE_RC_DL_MDIO_WR_DATA);
>> + for (tries = 0; !MDIO_WT_DONE(data) && tries < 10; tries++) {
>> + udelay(10);
>> + data = bcm_readl(base + PCIE_RC_DL_MDIO_WR_DATA);
>> + }
>> +
>> + return MDIO_WT_DONE(data) ? 0 : -EIO;
>> +}
>> +
>> +static u32 rd_fld(void __iomem *p, u32 mask, int shift)
>> +{
>> + return (bcm_readl(p) & mask) >> shift;
>> +}
>> +
>> +static void wr_fld(void __iomem *p, u32 mask, int shift, u32 val)
>> +{
>> + u32 reg = bcm_readl(p);
>> +
>> + reg = (reg & ~mask) | ((val << shift) & mask);
>> + bcm_writel(reg, p);
>> +}
>> +
>> +static void wr_fld_rb(void __iomem *p, u32 mask, int shift, u32 val)
>> +{
>> + wr_fld(p, mask, shift, val);
>> + (void)bcm_readl(p);
>> +}
>> +
>> +/* configures device for ssc mode; negative return value indicates error */
>> +static int set_ssc(void __iomem *base)
>> +{
>> + int tmp;
>> + u16 wrdata;
>> + int pll, ssc;
>> +
>> + tmp = mdio_write(base, MDIO_PORT0, SET_ADDR_OFFSET, SSC_REGS_ADDR);
>> + if (tmp < 0)
>> + return tmp;
>> +
>> + tmp = mdio_read(base, MDIO_PORT0, SSC_CNTL_OFFSET);
>> + if (tmp < 0)
>> + return tmp;
>> +
>> + wrdata = INSERT_FIELD(tmp, SSC_CNTL_OVRD, EN, 1);
>> + wrdata = INSERT_FIELD(wrdata, SSC_CNTL_OVRD, VAL, 1);
>> + tmp = mdio_write(base, MDIO_PORT0, SSC_CNTL_OFFSET, wrdata);
>> + if (tmp < 0)
>> + return tmp;
>> +
>> + usleep_range(1000, 2000);
>> + tmp = mdio_read(base, MDIO_PORT0, SSC_STATUS_OFFSET);
>> + if (tmp < 0)
>> + return tmp;
>> +
>> + ssc = EXTRACT_FIELD(tmp, SSC_STATUS, SSC);
>> + pll = EXTRACT_FIELD(tmp, SSC_STATUS, PLL_LOCK);
>> +
>> + return (ssc && pll) ? 0 : -EIO;
>> +}
>> +
>> +/* limits operation to a specific generation (1, 2, or 3) */
>> +static void set_gen(void __iomem *base, int gen)
>> +{
>> + WR_FLD(base, PCIE_RC_CFG_PCIE_LINK_CAPABILITY, MAX_LINK_SPEED, gen);
>> + WR_FLD(base, PCIE_RC_CFG_PCIE_LINK_STATUS_CONTROL_2,
>> + TARGET_LINK_SPEED, gen);
>> +}
>> +
>> +static void set_pcie_outbound_win(struct brcm_pcie *pcie, unsigned int win,
>> + phys_addr_t cpu_addr, dma_addr_t pci_addr,
>> + dma_addr_t size)
>> +{
>> + void __iomem *base = pcie->base;
>> + phys_addr_t cpu_addr_mb, limit_addr_mb;
>> + u32 tmp;
>> +
>> + /* Set the base of the pci_addr window */
>> + bcm_writel(lower_32_bits(pci_addr) + MMIO_ENDIAN,
>> + base + PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO + (win * 8));
>> + bcm_writel(upper_32_bits(pci_addr),
>> + base + PCIE_MISC_CPU_2_PCIE_MEM_WIN0_HI + (win * 8));
>> +
>> + cpu_addr_mb = cpu_addr >> 20;
>> + limit_addr_mb = (cpu_addr + size - 1) >> 20;
>> +
>> + /* Write the addr base low register */
>> + WR_FLD_WITH_OFFSET(base, (win * 4),
>> + PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT,
>> + BASE, cpu_addr_mb);
>> + /* Write the addr limit low register */
>> + WR_FLD_WITH_OFFSET(base, (win * 4),
>> + PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT,
>> + LIMIT, limit_addr_mb);
>> +
>> + if (pcie->type != BCM7435 && pcie->type != BCM7425) {
>> + /* Write the cpu addr high register */
>> + tmp = (u32)(cpu_addr_mb >>
>> + PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_NUM_MASK_BITS);
>> + WR_FLD_WITH_OFFSET(base, (win * 8),
>> + PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_HI,
>> + BASE, tmp);
>> + /* Write the cpu limit high register */
>> + tmp = (u32)(limit_addr_mb >>
>> + PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT_NUM_MASK_BITS);
>> + WR_FLD_WITH_OFFSET(base, (win * 8),
>> + PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LIMIT_HI,
>> + LIMIT, tmp);
>> + }
>> +}
>> +
>> +static int is_pcie_link_up(struct brcm_pcie *pcie, bool silent)
>
> Please use function names similar to other drivers, e.g.,
> brcm_pcie_link_up() in this case.
>
>> +{
>> + void __iomem *base = pcie->base;
>> + u32 val = bcm_readl(base + PCIE_MISC_PCIE_STATUS);
>> + u32 dla = EXTRACT_FIELD(val, PCIE_MISC_PCIE_STATUS, PCIE_DL_ACTIVE);
>> + u32 plu = EXTRACT_FIELD(val, PCIE_MISC_PCIE_STATUS, PCIE_PHYLINKUP);
>> + u32 rc = EXTRACT_FIELD(val, PCIE_MISC_PCIE_STATUS, PCIE_PORT);
>> +
>> + if (!rc && !silent)
>> + dev_err(pcie->dev, "controller configured in EP mode\n");
>> +
>> + return (rc && dla && plu) ? 1 : 0;
>> +}
>> +
>> +static inline void brcm_pcie_bridge_sw_init_set(struct brcm_pcie *pcie,
>> + unsigned int val)
>> +{
>> + unsigned int offset;
>> + unsigned int shift = pcie->reg_field_info[RGR1_SW_INIT_1_INIT_SHIFT];
>> + u32 mask = pcie->reg_field_info[RGR1_SW_INIT_1_INIT_MASK];
>> +
>> + if (pcie->type != BCM7278) {
>> + wr_fld_rb(pcie->base + PCIE_RGR1_SW_INIT_1(pcie), mask, shift,
>> + val);
>> + } else if (of_machine_is_compatible("brcm,bcm7278a0")) {
>> + /* The two PCIE instance on 7278a0 are not even consistent with
>> + * respect to each other for internal offsets, here we offset
>> + * by 0x14000 + RGR1_SW_INIT_1's relative offset to account for
>> + * that.
>> + */
>> + offset = pcie->id ? 0x14010 : pcie->reg_offsets[RGR1_SW_INIT_1];
>> + wr_fld_rb(pcie->base + offset, mask, shift, val);
>> + } else {
>> + wr_fld_rb(pcie->base + PCIE_RGR1_SW_INIT_1(pcie), mask, shift,
>> + val);
>> + }
>> +}
>> +
>> +static inline void brcm_pcie_perst_set(struct brcm_pcie *pcie,
>> + unsigned int val)
>> +{
>> + if (pcie->type != BCM7278)
>> + wr_fld_rb(pcie->base + PCIE_RGR1_SW_INIT_1(pcie),
>> + PCIE_RGR1_SW_INIT_1_PERST_MASK,
>> + PCIE_RGR1_SW_INIT_1_PERST_SHIFT, val);
>> + else
>> + /* Assert = 0, de-assert = 1 on 7278 */
>> + WR_FLD_RB(pcie->base, PCIE_MISC_PCIE_CTRL, PCIE_PERSTB, !val);
>> +}
>> +
>> +static int brcm_parse_ranges(struct brcm_pcie *pcie)
>> +{
>> + struct resource_entry *win;
>> + int ret;
>> +
>> + ret = of_pci_get_host_bridge_resources(pcie->dn, 0, 0xff,
>> + &pcie->resources, NULL);
>> + if (ret) {
>> + dev_err(pcie->dev, "failed to get host resources\n");
>> + return ret;
>> + }
>> +
>> + resource_list_for_each_entry(win, &pcie->resources) {
>> + struct resource *parent, *res = win->res;
>> + dma_addr_t offset = (dma_addr_t)win->offset;
>> +
>> + if (resource_type(res) == IORESOURCE_IO) {
>> + parent = &ioport_resource;
>> + } else if (resource_type(res) == IORESOURCE_MEM) {
>> + if (pcie->num_out_wins >= BRCM_NUM_PCI_OUT_WINS) {
>> + dev_err(pcie->dev, "too many outbound wins\n");
>> + return -EINVAL;
>> + }
>> + pcie->out_wins[pcie->num_out_wins].cpu_addr
>> + = (phys_addr_t)res->start;
>> + pcie->out_wins[pcie->num_out_wins].pci_addr
>> + = (dma_addr_t)(res->start
>> + - (phys_addr_t)offset);
>> + pcie->out_wins[pcie->num_out_wins].size
>> + = (dma_addr_t)(res->end - res->start + 1);
>> + pcie->num_out_wins++;
>> + parent = &iomem_resource;
>> + } else {
>> + continue;
>> + }
>> +
>> + ret = devm_request_resource(pcie->dev, parent, res);
>> + if (ret) {
>> + dev_err(pcie->dev, "failed to get res %pR\n", res);
>> + return ret;
>> + }
>> + }
>> + return 0;
>> +}
>> +
>> +static void set_regulators(struct brcm_pcie *pcie, bool on)
>> +{
>> + struct list_head *pos;
>> +
>> + list_for_each(pos, &pcie->pwr_supplies) {
>> + struct brcm_dev_pwr_supply *supply
>> + = list_entry(pos, struct brcm_dev_pwr_supply, node);
>> +
>> + if (on && regulator_enable(supply->regulator))
>> + pr_debug("Unable to turn on %s supply.\n",
>> + supply->name);
>> + else if (!on && regulator_disable(supply->regulator))
>> + pr_debug("Unable to turn off %s supply.\n",
>> + supply->name);
>> + }
>> +}
>> +
>> +static void brcm_pcie_setup_prep(struct brcm_pcie *pcie)
>> +{
>> + void __iomem *base = pcie->base;
>> + unsigned int scb_size_val;
>> + u64 rc_bar2_size = 0, rc_bar2_offset = 0, total_mem_size = 0;
>> + u32 tmp, burst;
>> + int i;
>> +
>> + /* reset the bridge and the endpoint device */
>> + /* field: PCIE_BRIDGE_SW_INIT = 1 */
>> + brcm_pcie_bridge_sw_init_set(pcie, 1);
>> +
>> + /* field: PCIE_SW_PERST = 1, on 7278, we start de-asserted already */
>> + if (pcie->type != BCM7278)
>> + brcm_pcie_perst_set(pcie, 1);
>> +
>> + usleep_range(100, 200);
>> +
>> + /* take the bridge out of reset */
>> + /* field: PCIE_BRIDGE_SW_INIT = 0 */
>> + brcm_pcie_bridge_sw_init_set(pcie, 0);
>> +
>> + WR_FLD_RB(base, PCIE_MISC_HARD_PCIE_HARD_DEBUG, SERDES_IDDQ, 0);
>> + /* wait for serdes to be stable */
>> + usleep_range(100, 200);
>> +
>> + /* Grab the PCIe hw revision number */
>> + tmp = bcm_readl(base + PCIE_MISC_REVISION);
>> + pcie->rev = EXTRACT_FIELD(tmp, PCIE_MISC_REVISION, MAJMIN);
>> +
>> + /* Set SCB_MAX_BURST_SIZE, CFG_READ_UR_MODE, SCB_ACCESS_EN */
>> + tmp = INSERT_FIELD(0, PCIE_MISC_MISC_CTRL, SCB_ACCESS_EN, 1);
>> + tmp = INSERT_FIELD(tmp, PCIE_MISC_MISC_CTRL, CFG_READ_UR_MODE, 1);
>> + burst = (pcie->type == GENERIC || pcie->type == BCM7278)
>> + ? BURST_SIZE_512 : BURST_SIZE_256;
>> + tmp = INSERT_FIELD(tmp, PCIE_MISC_MISC_CTRL, MAX_BURST_SIZE, burst);
>> + bcm_writel(tmp, base + PCIE_MISC_MISC_CTRL);
>> +
>> + /* Set up inbound memory view for the EP (called RC_BAR2,
>> + * not to be confused with the BARs that are advertised by
>> + * the EP).
>
> Multi-line comment style here and below.
>
>> + */
>> + for (i = 0; i < num_memc; i++)
>> + total_mem_size += scb_size[i];
>> +
>> + /* The PCI host controller by design must set the inbound
>> + * viewport to be a contiguous arrangement of all of the
>> + * system's memory. In addition, its size mut be a power of
>> + * two. To further complicate matters, the viewport must
>> + * start on a pci-address that is aligned on a multiple of its
>> + * size. If a portion of the viewport does not represent
>> + * system memory -- e.g. 3GB of memory requires a 4GB viewport
>> + * -- we can map the outbound memory in or after 3GB and even
>> + * though the viewport will overlap the outbound memory the
>> + * controller will know to send outbound memory downstream and
>> + * everything else upstream.
>> + */
>> + rc_bar2_size = roundup_pow_of_two_64(total_mem_size);
>> +
>> + /* Set simple configuration based on memory sizes
>> + * only. We always start the viewport at address 0.
>> + */
>> + rc_bar2_offset = 0;
>> +
>> + tmp = lower_32_bits(rc_bar2_offset);
>> + tmp = INSERT_FIELD(tmp, PCIE_MISC_RC_BAR2_CONFIG_LO, SIZE,
>> + encode_ibar_size(rc_bar2_size));
>> + bcm_writel(tmp, base + PCIE_MISC_RC_BAR2_CONFIG_LO);
>> + bcm_writel(upper_32_bits(rc_bar2_offset),
>> + base + PCIE_MISC_RC_BAR2_CONFIG_HI);
>> +
>> + /* field: SCB0_SIZE, default = 0xf (1 GB) */
>> + scb_size_val = scb_size[0]
>> + ? ilog2(scb_size[0]) - 15 : 0xf;
>> + WR_FLD(base, PCIE_MISC_MISC_CTRL, SCB0_SIZE, scb_size_val);
>> +
>> + /* field: SCB1_SIZE, default = 0xf (1 GB) */
>> + if (num_memc > 1) {
>> + scb_size_val = scb_size[1]
>> + ? ilog2(scb_size[1]) - 15 : 0xf;
>> + WR_FLD(base, PCIE_MISC_MISC_CTRL, SCB1_SIZE, scb_size_val);
>> + }
>> +
>> + /* field: SCB2_SIZE, default = 0xf (1 GB) */
>> + if (num_memc > 2) {
>> + scb_size_val = scb_size[2]
>> + ? ilog2(scb_size[2]) - 15 : 0xf;
>> + WR_FLD(base, PCIE_MISC_MISC_CTRL, SCB2_SIZE, scb_size_val);
>> + }
>> +
>> + /* disable the PCIE->GISB memory window (RC_BAR1) */
>> + WR_FLD(base, PCIE_MISC_RC_BAR1_CONFIG_LO, SIZE, 0);
>> +
>> + /* disable the PCIE->SCB memory window (RC_BAR3) */
>> + WR_FLD(base, PCIE_MISC_RC_BAR3_CONFIG_LO, SIZE, 0);
>> +
>> + if (!pcie->suspended) {
>> + /* clear any interrupts we find on boot */
>> + bcm_writel(0xffffffff, base + PCIE_INTR2_CPU_BASE + CLR);
>> + (void)bcm_readl(base + PCIE_INTR2_CPU_BASE + CLR);
>> + }
>> +
>> + /* Mask all interrupts since we are not handling any yet */
>> + bcm_writel(0xffffffff, base + PCIE_INTR2_CPU_BASE + MASK_SET);
>> + (void)bcm_readl(base + PCIE_INTR2_CPU_BASE + MASK_SET);
>> +
>> + if (pcie->gen)
>> + set_gen(base, pcie->gen);
>> +
>> + /* take the EP device out of reset */
>> + /* field: PCIE_SW_PERST = 0 */
>> + brcm_pcie_perst_set(pcie, 0);
>> +}
>> +
>> +static const char *link_speed_to_str(int s)
>> +{
>> + switch (s) {
>> + case 1:
>> + return "2.5";
>> + case 2:
>> + return "5.0";
>> + case 3:
>> + return "8.0";
>> + default:
>> + break;
>> + }
>> + return "???";
>> +}
>> +
>> +static int brcm_pcie_setup_bridge(struct brcm_pcie *pcie)
>> +{
>> + void __iomem *base = pcie->base;
>> + const int limit = pcie->suspended ? 1000 : 100;
>> + unsigned int status;
>> + int i, j, ret;
>> + u32 neg_width, neg_speed;
>> + bool ssc_good = false;
>> +
>> + /* Give the RC/EP time to wake up, before trying to configure RC.
>> + * Intermittently check status for link-up, up to a total of 100ms
>> + * when we don't know if the device is there, and up to 1000ms if
>> + * we do know the device is there.
>> + */
>> + for (i = 1, j = 0; j < limit && !is_pcie_link_up(pcie, true);
>> + j += i, i = i * 2)
>> + msleep(i + j > limit ? limit - j : i);
>> +
>> + if (!is_pcie_link_up(pcie, false)) {
>> + dev_info(pcie->dev, "link down\n");
>> + return -ENODEV;
>> + }
>> +
>> + for (i = 0; i < pcie->num_out_wins; i++)
>> + set_pcie_outbound_win(pcie, i, pcie->out_wins[i].cpu_addr,
>> + pcie->out_wins[i].pci_addr,
>> + pcie->out_wins[i].size);
>> +
>> + /* For config space accesses on the RC, show the right class for
>> + * a PCI-PCI bridge
>> + */
>> + WR_FLD_RB(base, PCIE_RC_CFG_PRIV1_ID_VAL3, CLASS_CODE, 0x060400);
>> +
>> + if (pcie->ssc) {
>> + ret = set_ssc(base);
>> + if (ret == 0)
>> + ssc_good = true;
>> + else
>> + dev_err(pcie->dev,
>> + "failed attempt to enter ssc mode\n");
>> + }
>> +
>> + status = bcm_readl(base + PCIE_RC_CFG_PCIE_LINK_STATUS_CONTROL);
>> + neg_width = EXTRACT_FIELD(status, PCIE_RC_CFG_PCIE_LINK_STATUS_CONTROL,
>> + NEG_LINK_WIDTH);
>> + neg_speed = EXTRACT_FIELD(status, PCIE_RC_CFG_PCIE_LINK_STATUS_CONTROL,
>> + NEG_LINK_SPEED);
>> + dev_info(pcie->dev, "link up, %s Gbps x%u %s\n",
>> + link_speed_to_str(neg_speed), neg_width,
>> + ssc_good ? "(SSC)" : "(!SSC)");
>> +
>> + /* Enable configuration request retry (see pci_scan_device()) */
>> + /* field RC_CRS_EN = 1 */
>> + WR_FLD(base, PCIE_RC_CFG_PCIE_ROOT_CAP_CONTROL, RC_CRS_EN, 1);
>
> As long as you advertise CRS SV support, the PCI core should be
> enabling it automatically; why do you need this here?
>
Will investigate.
>> +
>> + /* PCIE->SCB endian mode for BAR */
>> + /* field ENDIAN_MODE_BAR2 = DATA_ENDIAN */
>> + WR_FLD_RB(base, PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1,
>> + ENDIAN_MODE_BAR2, DATA_ENDIAN);
>> +
>> + /* Refclk from RC should be gated with CLKREQ# input when ASPM L0s,L1
>> + * is enabled => setting the CLKREQ_DEBUG_ENABLE field to 1.
>> + */
>> + WR_FLD_RB(base, PCIE_MISC_HARD_PCIE_HARD_DEBUG, CLKREQ_DEBUG_ENABLE, 1);
>> +
>> + pcie->bridge_setup_done = true;
>> +
>> + return 0;
>> +}
>> +
>> +static void enter_l23(struct brcm_pcie *pcie)
>> +{
>> + void __iomem *base = pcie->base;
>> + int tries, l23;
>> +
>> + /* assert request for L23 */
>> + WR_FLD_RB(base, PCIE_MISC_PCIE_CTRL, PCIE_L23_REQUEST, 1);
>> + /* poll L23 status */
>> + for (tries = 0, l23 = 0; tries < 1000 && !l23; tries++)
>> + l23 = RD_FLD(base, PCIE_MISC_PCIE_STATUS, PCIE_LINK_IN_L23);
>> + if (!l23)
>> + dev_err(pcie->dev, "failed to enter L23\n");
>> +}
>> +
>> +static void turn_off(struct brcm_pcie *pcie)
>> +{
>> + void __iomem *base = pcie->base;
>> +
>> + if (is_pcie_link_up(pcie, true))
>> + enter_l23(pcie);
>> + /* Reset endpoint device */
>> + brcm_pcie_perst_set(pcie, 1);
>> + /* deassert request for L23 in case it was asserted */
>> + WR_FLD_RB(base, PCIE_MISC_PCIE_CTRL, PCIE_L23_REQUEST, 0);
>> + /* SERDES_IDDQ = 1 */
>> + WR_FLD_RB(base, PCIE_MISC_HARD_PCIE_HARD_DEBUG, SERDES_IDDQ, 1);
>> + /* Shutdown PCIe bridge */
>> + brcm_pcie_bridge_sw_init_set(pcie, 1);
>> +}
>> +
>> +static int brcm_pcie_suspend(struct device *dev)
>> +{
>> + struct brcm_pcie *pcie = dev_get_drvdata(dev);
>> +
>> + if (!pcie->bridge_setup_done)
>> + return 0;
>> +
>> + turn_off(pcie);
>> + clk_disable_unprepare(pcie->clk);
>> + set_regulators(pcie, false);
>> + pcie->suspended = true;
>> +
>> + return 0;
>> +}
>> +
>> +static int brcm_pcie_resume(struct device *dev)
>> +{
>> + struct brcm_pcie *pcie = dev_get_drvdata(dev);
>> + void __iomem *base;
>> + int ret;
>> +
>> + if (!pcie->bridge_setup_done)
>> + return 0;
>> +
>> + base = pcie->base;
>> + set_regulators(pcie, true);
>> + clk_prepare_enable(pcie->clk);
>> +
>> + /* Take bridge out of reset so we can access the SERDES reg */
>> + brcm_pcie_bridge_sw_init_set(pcie, 0);
>> +
>> + /* SERDES_IDDQ = 0 */
>> + WR_FLD_RB(base, PCIE_MISC_HARD_PCIE_HARD_DEBUG, SERDES_IDDQ, 0);
>> + /* wait for serdes to be stable */
>> + usleep_range(100, 200);
>> +
>> + brcm_pcie_setup_prep(pcie);
>> +
>> + ret = brcm_pcie_setup_bridge(pcie);
>> + if (ret)
>> + return ret;
>> +
>> + pcie->suspended = false;
>> +
>> + return 0;
>> +}
>> +
>> +/* Configuration space read/write support */
>> +static int cfg_index(int busnr, int devfn, int reg)
>> +{
>> + return ((PCI_SLOT(devfn) & 0x1f) << PCI_SLOT_SHIFT)
>> + | ((PCI_FUNC(devfn) & 0x07) << PCI_FUNC_SHIFT)
>> + | (busnr << PCI_BUSNUM_SHIFT)
>> + | (reg & ~3);
>> +}
>> +
>> +static void __iomem *brcm_pci_map_cfg(struct pci_bus *bus, unsigned int devfn,
>> + int where)
>> +{
>> + struct brcm_pcie *pcie = bus->sysdata;
>> + void __iomem *base = pcie->base;
>> + bool rc_access = pci_is_root_bus(bus);
>> + int idx;
>> +
>> + if (!is_pcie_link_up(pcie, true))
>> + return NULL;
>
> Why do you need this test? It makes this racy because the link could
> go down after you call is_pcie_link_up() but before you perform the
> config access.
We've had a scenario where the EP resets itself and the link is down.
This code recognizes that situation and errors out
instead of making a call that effects an imprecise abort.
>
>> + base = pcie->base;
>> + idx = cfg_index(bus->number, devfn, where);
>> +
>> + bcm_writel(idx, pcie->base + IDX_ADDR(pcie));
>> +
>> + if (rc_access) {
>> + if (PCI_SLOT(devfn))
>> + return NULL;
>> + return base + (where & ~3);
>> + }
>
> Many drivers have a similar pattern. Please implement this in a
> similar way, e.g., see dw_pcie_valid_device(),
> altera_pcie_valid_device(), rockchip_pcie_valid_device(), etc.
>
>> + return pcie->base + DATA_ADDR(pcie);
>> +}
>> +
>> +static void __attribute__((__section__("pci_fixup_early")))
>> +brcm_pcibios_fixup(struct pci_dev *dev)
>> +{
>> + struct brcm_pcie *pcie = dev->bus->sysdata;
>> + u8 slot = PCI_SLOT(dev->devfn);
>> +
>> + dev_info(pcie->dev,
>> + "found device %04x:%04x on bus %d (%s), slot %d (irq %d)\n",
>> + dev->vendor, dev->device, dev->bus->number, pcie->name,
>> + slot, of_irq_parse_and_map_pci(dev, slot, 1));
>> +}
>> +DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, brcm_pcibios_fixup);
>
> This looks like debug code that should be removed.
>
>> +
>> +static const struct of_device_id brcm_pci_match[] = {
>> + { .compatible = "brcm,bcm7425-pcie", .data = &bcm7425_cfg },
>> + { .compatible = "brcm,bcm7435-pcie", .data = &bcm7435_cfg },
>> + { .compatible = "brcm,bcm7278-pcie", .data = &bcm7278_cfg },
>> + { .compatible = "brcm,bcm7445-pcie", .data = &generic_cfg },
>> + {},
>> +};
>> +MODULE_DEVICE_TABLE(of, brcm_pci_match);
>> +
>> +static void _brcm_pcie_remove(struct brcm_pcie *pcie)
>> +{
>> + turn_off(pcie);
>> + clk_disable_unprepare(pcie->clk);
>> + clk_put(pcie->clk);
>> + set_regulators(pcie, false);
>> + brcm_pcie_remove_controller(pcie);
>> +}
>> +
>> +static int brcm_pcie_probe(struct platform_device *pdev)
>> +{
>> + struct device_node *dn = pdev->dev.of_node;
>> + struct property *pp;
>> + const struct of_device_id *of_id;
>> + const struct pcie_cfg_data *data;
>> + int ret;
>> + struct brcm_pcie *pcie;
>> + struct resource *res;
>> + void __iomem *base;
>> + u32 tmp;
>> + struct brcm_dev_pwr_supply *supply;
>> + struct pci_host_bridge *bridge;
>> + struct pci_bus *child;
>> + u32 domain;
>> +
>> + bridge = devm_pci_alloc_host_bridge(&pdev->dev, sizeof(*pcie));
>> + if (!bridge)
>> + return -ENOMEM;
>> +
>> + pcie = pci_host_bridge_priv(bridge);
>> + INIT_LIST_HEAD(&pcie->resources);
>> +
>> + of_id = of_match_node(brcm_pci_match, dn);
>> + if (!of_id) {
>> + pr_err("failed to look up compatible string\n");
>
> Please use dev_err(), etc. for every single log message so we can
> associate log messages with a device.
>
>> + return -EINVAL;
>> + }
>> +
>> + if (of_property_read_u32(dn, "dma-ranges", &tmp) == 0) {
>> + pr_err("cannot yet handle dma-ranges\n");
>> + return -EINVAL;
>> + }
>> +
>> + data = of_id->data;
>> + pcie->reg_offsets = data->offsets;
>> + pcie->reg_field_info = data->reg_field_info;
>> + pcie->type = data->type;
>> + pcie->dn = dn;
>> + pcie->dev = &pdev->dev;
>> +
>> + if (of_property_read_u32(dn, "linux,pci-domain", &domain) == 0) {
>> + pcie->id = (int)domain;
>> + } else {
>> + dev_err(pcie->dev, "linux,pci-domain prop missing\n");
>> + return -EINVAL;
>> + }
>
> You should not need this. This should happen automatically via
> of_get_pci_domain_nr() if you have things set up correctly.
>
>> +
>> + INIT_LIST_HEAD(&pcie->pwr_supplies);
>> + for_each_property_of_node(dn, pp) {
>> + const int n = strlen(pp->name);
>> +
>> + if (n < 7)
>> + continue;
>> + if (strncmp(pp->name + n - 7, "-supply", 7))
>> + continue;
>> + if (n > sizeof(supply->name) - 1) {
>> + dev_err(&pdev->dev, "prop supply name %s too long\n",
>> + pp->name);
>> + continue;
>> + }
>> + supply = devm_kzalloc(&pdev->dev, sizeof(*supply), GFP_KERNEL);
>> + if (!supply)
>> + return -ENOMEM;
>> + strcpy(supply->name, pp->name);
>> + supply->name[n - 7] = 0; /* remove "-supply" */
>> + supply->regulator = devm_regulator_get(&pdev->dev, supply->name);
>> +
>> + if (IS_ERR(supply->regulator)) {
>> + dev_err(&pdev->dev, "Unable to get %s, err=%d\n",
>> + pp->name, (int)PTR_ERR(supply->regulator));
>> + continue;
>> + }
>> + list_add_tail(&supply->node, &pcie->pwr_supplies);
>> + }
>> +
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> + if (!res)
>> + return -EINVAL;
>> +
>> + base = devm_ioremap_resource(&pdev->dev, res);
>> + if (IS_ERR(base))
>> + return PTR_ERR(base);
>> +
>> + pcie->clk = of_clk_get_by_name(dn, "sw_pcie");
>> + if (IS_ERR(pcie->clk)) {
>> + dev_err(&pdev->dev, "could not get clock\n");
>> + pcie->clk = NULL;
>> + }
>> + pcie->base = base;
>> +
>> + ret = of_pci_get_max_link_speed(dn);
>> + pcie->gen = (ret < 0) ? 0 : ret;
>> +
>> + pcie->ssc = of_property_read_bool(dn, "brcm,ssc");
>> +
>> + ret = irq_of_parse_and_map(pdev->dev.of_node, 0);
>> + if (ret == 0)
>> + /* keep going, as we don't use this intr yet */
>> + dev_warn(pcie->dev, "cannot get pcie interrupt\n");
>> + else
>> + pcie->irq = ret;
>> +
>> + ret = brcm_parse_ranges(pcie);
>> + if (ret)
>> + return ret;
>> +
>> + ret = clk_prepare_enable(pcie->clk);
>> + if (ret) {
>> + dev_err(&pdev->dev, "could not enable clock\n");
>> + return ret;
>> + }
>> +
>> + ret = brcm_pcie_add_controller(pcie);
>> + if (ret)
>> + return ret;
>> +
>> + set_regulators(pcie, true);
>> + brcm_pcie_setup_prep(pcie);
>> + ret = brcm_pcie_setup_bridge(pcie);
>> + if (ret)
>> + goto fail;
>> +
>> + list_splice_init(&pcie->resources, &bridge->windows);
>> + bridge->dev.parent = &pdev->dev;
>> + bridge->busnr = 0;
>> + bridge->ops = &brcm_pci_ops;
>> + bridge->sysdata = pcie;
>> + bridge->map_irq = of_irq_parse_and_map_pci;
>> + bridge->swizzle_irq = pci_common_swizzle;
>> +
>> + ret = pci_scan_root_bus_bridge(bridge);
>> + if (ret < 0) {
>> + dev_err(pcie->dev, "Scanning root bridge failed");
>> + goto fail;
>> + }
>> +
>> + pci_assign_unassigned_bus_resources(bridge->bus);
>> + list_for_each_entry(child, &bridge->bus->children, node)
>> + pcie_bus_configure_settings(child);
>> + pci_bus_add_devices(bridge->bus);
>> + platform_set_drvdata(pdev, pcie);
>> + pcie->root_bus = bridge->bus;
>
> General comment, can you scan some of the other drivers in
> drivers/pci/host/ and follow a similar style? Similar structure,
> similar function names, similar variable names, etc. It makes it much
> easier to maintain this whole collection.
>
>> + return 0;
>> +
>> +fail:
>> + _brcm_pcie_remove(pcie);
>> + return ret;
>> +}
>> +
>> +static int brcm_pcie_remove(struct platform_device *pdev)
>> +{
>> + struct brcm_pcie *pcie = platform_get_drvdata(pdev);
>> +
>> + pci_stop_root_bus(pcie->root_bus);
>> + pci_remove_root_bus(pcie->root_bus);
>> + _brcm_pcie_remove(pcie);
>> +
>> + return 0;
>> +}
>> +
>> +static const struct dev_pm_ops brcm_pcie_pm_ops = {
>> + .suspend_noirq = brcm_pcie_suspend,
>> + .resume_noirq = brcm_pcie_resume,
>> +};
>> +
>> +static struct platform_driver __refdata brcm_pci_driver = {
>> + .probe = brcm_pcie_probe,
>> + .remove = brcm_pcie_remove,
>> + .driver = {
>> + .name = "brcm-pci",
>> + .owner = THIS_MODULE,
>> + .of_match_table = brcm_pci_match,
>> + .pm = &brcm_pcie_pm_ops,
>> + },
>> +};
>> +
>> +module_platform_driver(brcm_pci_driver);
>> +
>> +MODULE_LICENSE("GPL");
>> +MODULE_DESCRIPTION("Broadcom STB PCIE RC driver");
>> +MODULE_AUTHOR("Broadcom");
>> diff --git a/drivers/pci/host/pci-brcmstb.h b/drivers/pci/host/pci-brcmstb.h
>> new file mode 100644
>> index 0000000..86f9cd1
>> --- /dev/null
>> +++ b/drivers/pci/host/pci-brcmstb.h
>> @@ -0,0 +1,33 @@
>> +#ifndef __BRCMSTB_PCI_H
>> +#define __BRCMSTB_PCI_H
>> +
>> +/*
>> + * Copyright (C) 2015 - 2017 Broadcom
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License version 2 as
>> + * published by the Free Software Foundation.
>> + *
>> + * This program is distributed in the hope that it will be useful,
>> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
>> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
>> + * GNU General Public License for more details.
>> + */
>> +
>> +#define BRCM_PCIE_NAME_SIZE 8
>> +#define BRCM_INT_PCI_MSI_NR 32
>> +#define BRCM_PCIE_HW_REV_33 0x0303
>> +
>> +/* Broadcom PCIE Offsets */
>> +#define PCIE_INTR2_CPU_BASE 0x4300
>> +
>> +#if defined(CONFIG_MIPS)
>> +/* Broadcom MIPs HW implicitly does the swapping if necessary */
>> +#define bcm_readl(a) __raw_readl(a)
>> +#define bcm_writel(d, a) __raw_writel(d, a)
>> +#else
>> +#define bcm_readl(a) readl(a)
>> +#define bcm_writel(d, a) writel(d, a)
>> +#endif
>> +
>> +#endif /* __BRCMSTB_PCI_H */
>> --
>> 1.9.0.138.g2de3478
>>
>>
>> _______________________________________________
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>> linux-arm-kernel@...ts.infradead.org
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