// SPDX-License-Identifier: GPL-2.0
/*
* Copyright ( C ) 2014 Hauke Mehrtens < hauke @ hauke - m . de >
* Copyright ( C ) 2015 Broadcom Corporation
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/pci-ecam.h>
#include <linux/msi.h>
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/mbus.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/irqchip/arm-gic-v3.h>
#include <linux/platform_device.h>
#include <linux/of_address.h>
#include <linux/of_pci.h>
#include <linux/of_platform.h>
#include <linux/phy/phy.h>
#include "pcie-iproc.h"
#define EP_PERST_SOURCE_SELECT_SHIFT 2
#define EP_PERST_SOURCE_SELECT BIT(EP_PERST_SOURCE_SELECT_SHIFT)
#define EP_MODE_SURVIVE_PERST_SHIFT 1
#define EP_MODE_SURVIVE_PERST BIT(EP_MODE_SURVIVE_PERST_SHIFT)
#define RC_PCIE_RST_OUTPUT_SHIFT 0
#define RC_PCIE_RST_OUTPUT BIT(RC_PCIE_RST_OUTPUT_SHIFT)
#define PAXC_RESET_MASK 0 x7f
#define GIC_V3_CFG_SHIFT 0
#define GIC_V3_CFG BIT(GIC_V3_CFG_SHIFT)
#define MSI_ENABLE_CFG_SHIFT 0
#define MSI_ENABLE_CFG BIT(MSI_ENABLE_CFG_SHIFT)
#define CFG_IND_ADDR_MASK 0 x00001ffc
#define CFG_ADDR_REG_NUM_MASK 0 x00000ffc
#define CFG_ADDR_CFG_TYPE_1 1
#define SYS_RC_INTX_MASK 0 xf
#define PCIE_PHYLINKUP_SHIFT 3
#define PCIE_PHYLINKUP BIT(PCIE_PHYLINKUP_SHIFT)
#define PCIE_DL_ACTIVE_SHIFT 2
#define PCIE_DL_ACTIVE BIT(PCIE_DL_ACTIVE_SHIFT)
#define APB_ERR_EN_SHIFT 0
#define APB_ERR_EN BIT(APB_ERR_EN_SHIFT)
#define CFG_RD_SUCCESS 0
#define CFG_RD_UR 1
#define CFG_RD_RRS 2
#define CFG_RD_CA 3
#define CFG_RETRY_STATUS 0 xffff0001
#define CFG_RETRY_STATUS_TIMEOUT_US 500000 /* 500 milliseconds */
/* derive the enum index of the outbound/inbound mapping registers */
#define MAP_REG(base_reg, index) ((base_reg) + (index) * 2 )
/*
* Maximum number of outbound mapping window sizes that can be supported by any
* OARR / OMAP mapping pair
*/
#define MAX_NUM_OB_WINDOW_SIZES 4
#define OARR_VALID_SHIFT 0
#define OARR_VALID BIT(OARR_VALID_SHIFT)
#define OARR_SIZE_CFG_SHIFT 1
/*
* Maximum number of inbound mapping region sizes that can be supported by an
* IARR
*/
#define MAX_NUM_IB_REGION_SIZES 9
#define IMAP_VALID_SHIFT 0
#define IMAP_VALID BIT(IMAP_VALID_SHIFT)
#define IPROC_PCI_PM_CAP 0 x48
#define IPROC_PCI_PM_CAP_MASK 0 xffff
#define IPROC_PCI_EXP_CAP 0 xac
#define IPROC_PCIE_REG_INVALID 0 xffff
/**
* struct iproc_pcie_ob_map - iProc PCIe outbound mapping controller - specific
* parameters
* @ window_sizes : list of supported outbound mapping window sizes in MB
* @ nr_sizes : number of supported outbound mapping window sizes
*/
struct iproc_pcie_ob_map {
resource_size_t window_sizes[MAX_NUM_OB_WINDOW_SIZES];
unsigned int nr_sizes;
};
static const struct iproc_pcie_ob_map paxb_ob_map[] = {
{
/* OARR0/OMAP0 */
.window_sizes = { 128 , 256 },
.nr_sizes = 2 ,
},
{
/* OARR1/OMAP1 */
.window_sizes = { 128 , 256 },
.nr_sizes = 2 ,
},
};
static const struct iproc_pcie_ob_map paxb_v2_ob_map[] = {
{
/* OARR0/OMAP0 */
.window_sizes = { 128 , 256 },
.nr_sizes = 2 ,
},
{
/* OARR1/OMAP1 */
.window_sizes = { 128 , 256 },
.nr_sizes = 2 ,
},
{
/* OARR2/OMAP2 */
.window_sizes = { 128 , 256 , 512 , 1024 },
.nr_sizes = 4 ,
},
{
/* OARR3/OMAP3 */
.window_sizes = { 128 , 256 , 512 , 1024 },
.nr_sizes = 4 ,
},
};
/**
* enum iproc_pcie_ib_map_type - iProc PCIe inbound mapping type
* @ IPROC_PCIE_IB_MAP_MEM : DDR memory
* @ IPROC_PCIE_IB_MAP_IO : device I / O memory
* @ IPROC_PCIE_IB_MAP_INVALID : invalid or unused
*/
enum iproc_pcie_ib_map_type {
IPROC_PCIE_IB_MAP_MEM = 0 ,
IPROC_PCIE_IB_MAP_IO,
IPROC_PCIE_IB_MAP_INVALID
};
/**
* struct iproc_pcie_ib_map - iProc PCIe inbound mapping controller - specific
* parameters
* @ type : inbound mapping region type
* @ size_unit : inbound mapping region size unit , could be SZ_1K , SZ_1M , or
* SZ_1G
* @ region_sizes : list of supported inbound mapping region sizes in KB , MB , or
* GB , depending on the size unit
* @ nr_sizes : number of supported inbound mapping region sizes
* @ nr_windows : number of supported inbound mapping windows for the region
* @ imap_addr_offset : register offset between the upper and lower 32 - bit
* IMAP address registers
* @ imap_window_offset : register offset between each IMAP window
*/
struct iproc_pcie_ib_map {
enum iproc_pcie_ib_map_type type;
unsigned int size_unit;
resource_size_t region_sizes[MAX_NUM_IB_REGION_SIZES];
unsigned int nr_sizes;
unsigned int nr_windows;
u16 imap_addr_offset;
u16 imap_window_offset;
};
static const struct iproc_pcie_ib_map paxb_v2_ib_map[] = {
{
/* IARR0/IMAP0 */
.type = IPROC_PCIE_IB_MAP_IO,
.size_unit = SZ_1K,
.region_sizes = { 32 },
.nr_sizes = 1 ,
.nr_windows = 8 ,
.imap_addr_offset = 0 x40,
.imap_window_offset = 0 x4,
},
{
/* IARR1/IMAP1 */
.type = IPROC_PCIE_IB_MAP_MEM,
.size_unit = SZ_1M,
.region_sizes = { 8 },
.nr_sizes = 1 ,
.nr_windows = 8 ,
.imap_addr_offset = 0 x4,
.imap_window_offset = 0 x8,
},
{
/* IARR2/IMAP2 */
.type = IPROC_PCIE_IB_MAP_MEM,
.size_unit = SZ_1M,
.region_sizes = { 64 , 128 , 256 , 512 , 1024 , 2048 , 4096 , 8192 ,
16384 },
.nr_sizes = 9 ,
.nr_windows = 1 ,
.imap_addr_offset = 0 x4,
.imap_window_offset = 0 x8,
},
{
/* IARR3/IMAP3 */
.type = IPROC_PCIE_IB_MAP_MEM,
.size_unit = SZ_1G,
.region_sizes = { 1 , 2 , 4 , 8 , 16 , 32 },
.nr_sizes = 6 ,
.nr_windows = 8 ,
.imap_addr_offset = 0 x4,
.imap_window_offset = 0 x8,
},
{
/* IARR4/IMAP4 */
.type = IPROC_PCIE_IB_MAP_MEM,
.size_unit = SZ_1G,
.region_sizes = { 32 , 64 , 128 , 256 , 512 },
.nr_sizes = 5 ,
.nr_windows = 8 ,
.imap_addr_offset = 0 x4,
.imap_window_offset = 0 x8,
},
};
/*
* iProc PCIe host registers
*/
enum iproc_pcie_reg {
/* clock/reset signal control */
IPROC_PCIE_CLK_CTRL = 0 ,
/*
* To allow MSI to be steered to an external MSI controller ( e . g . , ARM
* GICv3 ITS )
*/
IPROC_PCIE_MSI_GIC_MODE,
/*
* IPROC_PCIE_MSI_BASE_ADDR and IPROC_PCIE_MSI_WINDOW_SIZE define the
* window where the MSI posted writes are written , for the writes to be
* interpreted as MSI writes .
*/
IPROC_PCIE_MSI_BASE_ADDR,
IPROC_PCIE_MSI_WINDOW_SIZE,
/*
* To hold the address of the register where the MSI writes are
* programmed . When ARM GICv3 ITS is used , this should be programmed
* with the address of the GITS_TRANSLATER register .
*/
IPROC_PCIE_MSI_ADDR_LO,
IPROC_PCIE_MSI_ADDR_HI,
/* enable MSI */
IPROC_PCIE_MSI_EN_CFG,
/* allow access to root complex configuration space */
IPROC_PCIE_CFG_IND_ADDR,
IPROC_PCIE_CFG_IND_DATA,
/* allow access to device configuration space */
IPROC_PCIE_CFG_ADDR,
IPROC_PCIE_CFG_DATA,
/* enable INTx */
IPROC_PCIE_INTX_EN,
/* outbound address mapping */
IPROC_PCIE_OARR0,
IPROC_PCIE_OMAP0,
IPROC_PCIE_OARR1,
IPROC_PCIE_OMAP1,
IPROC_PCIE_OARR2,
IPROC_PCIE_OMAP2,
IPROC_PCIE_OARR3,
IPROC_PCIE_OMAP3,
/* inbound address mapping */
IPROC_PCIE_IARR0,
IPROC_PCIE_IMAP0,
IPROC_PCIE_IARR1,
IPROC_PCIE_IMAP1,
IPROC_PCIE_IARR2,
IPROC_PCIE_IMAP2,
IPROC_PCIE_IARR3,
IPROC_PCIE_IMAP3,
IPROC_PCIE_IARR4,
IPROC_PCIE_IMAP4,
/* config read status */
IPROC_PCIE_CFG_RD_STATUS,
/* link status */
IPROC_PCIE_LINK_STATUS,
/* enable APB error for unsupported requests */
IPROC_PCIE_APB_ERR_EN,
/* total number of core registers */
IPROC_PCIE_MAX_NUM_REG,
};
/* iProc PCIe PAXB BCMA registers */
static const u16 iproc_pcie_reg_paxb_bcma[IPROC_PCIE_MAX_NUM_REG] = {
[IPROC_PCIE_CLK_CTRL] = 0 x000,
[IPROC_PCIE_CFG_IND_ADDR] = 0 x120,
[IPROC_PCIE_CFG_IND_DATA] = 0 x124,
[IPROC_PCIE_CFG_ADDR] = 0 x1f8,
[IPROC_PCIE_CFG_DATA] = 0 x1fc,
[IPROC_PCIE_INTX_EN] = 0 x330,
[IPROC_PCIE_LINK_STATUS] = 0 xf0c,
};
/* iProc PCIe PAXB registers */
static const u16 iproc_pcie_reg_paxb[IPROC_PCIE_MAX_NUM_REG] = {
[IPROC_PCIE_CLK_CTRL] = 0 x000,
[IPROC_PCIE_CFG_IND_ADDR] = 0 x120,
[IPROC_PCIE_CFG_IND_DATA] = 0 x124,
[IPROC_PCIE_CFG_ADDR] = 0 x1f8,
[IPROC_PCIE_CFG_DATA] = 0 x1fc,
[IPROC_PCIE_INTX_EN] = 0 x330,
[IPROC_PCIE_OARR0] = 0 xd20,
[IPROC_PCIE_OMAP0] = 0 xd40,
[IPROC_PCIE_OARR1] = 0 xd28,
[IPROC_PCIE_OMAP1] = 0 xd48,
[IPROC_PCIE_LINK_STATUS] = 0 xf0c,
[IPROC_PCIE_APB_ERR_EN] = 0 xf40,
};
/* iProc PCIe PAXB v2 registers */
static const u16 iproc_pcie_reg_paxb_v2[IPROC_PCIE_MAX_NUM_REG] = {
[IPROC_PCIE_CLK_CTRL] = 0 x000,
[IPROC_PCIE_CFG_IND_ADDR] = 0 x120,
[IPROC_PCIE_CFG_IND_DATA] = 0 x124,
[IPROC_PCIE_CFG_ADDR] = 0 x1f8,
[IPROC_PCIE_CFG_DATA] = 0 x1fc,
[IPROC_PCIE_INTX_EN] = 0 x330,
[IPROC_PCIE_OARR0] = 0 xd20,
[IPROC_PCIE_OMAP0] = 0 xd40,
[IPROC_PCIE_OARR1] = 0 xd28,
[IPROC_PCIE_OMAP1] = 0 xd48,
[IPROC_PCIE_OARR2] = 0 xd60,
[IPROC_PCIE_OMAP2] = 0 xd68,
[IPROC_PCIE_OARR3] = 0 xdf0,
[IPROC_PCIE_OMAP3] = 0 xdf8,
[IPROC_PCIE_IARR0] = 0 xd00,
[IPROC_PCIE_IMAP0] = 0 xc00,
[IPROC_PCIE_IARR1] = 0 xd08,
[IPROC_PCIE_IMAP1] = 0 xd70,
[IPROC_PCIE_IARR2] = 0 xd10,
[IPROC_PCIE_IMAP2] = 0 xcc0,
[IPROC_PCIE_IARR3] = 0 xe00,
[IPROC_PCIE_IMAP3] = 0 xe08,
[IPROC_PCIE_IARR4] = 0 xe68,
[IPROC_PCIE_IMAP4] = 0 xe70,
[IPROC_PCIE_CFG_RD_STATUS] = 0 xee0,
[IPROC_PCIE_LINK_STATUS] = 0 xf0c,
[IPROC_PCIE_APB_ERR_EN] = 0 xf40,
};
/* iProc PCIe PAXC v1 registers */
static const u16 iproc_pcie_reg_paxc[IPROC_PCIE_MAX_NUM_REG] = {
[IPROC_PCIE_CLK_CTRL] = 0 x000,
[IPROC_PCIE_CFG_IND_ADDR] = 0 x1f0,
[IPROC_PCIE_CFG_IND_DATA] = 0 x1f4,
[IPROC_PCIE_CFG_ADDR] = 0 x1f8,
[IPROC_PCIE_CFG_DATA] = 0 x1fc,
};
/* iProc PCIe PAXC v2 registers */
static const u16 iproc_pcie_reg_paxc_v2[IPROC_PCIE_MAX_NUM_REG] = {
[IPROC_PCIE_MSI_GIC_MODE] = 0 x050,
[IPROC_PCIE_MSI_BASE_ADDR] = 0 x074,
[IPROC_PCIE_MSI_WINDOW_SIZE] = 0 x078,
[IPROC_PCIE_MSI_ADDR_LO] = 0 x07c,
[IPROC_PCIE_MSI_ADDR_HI] = 0 x080,
[IPROC_PCIE_MSI_EN_CFG] = 0 x09c,
[IPROC_PCIE_CFG_IND_ADDR] = 0 x1f0,
[IPROC_PCIE_CFG_IND_DATA] = 0 x1f4,
[IPROC_PCIE_CFG_ADDR] = 0 x1f8,
[IPROC_PCIE_CFG_DATA] = 0 x1fc,
};
/*
* List of device IDs of controllers that have corrupted capability list that
* require SW fixup
*/
static const u16 iproc_pcie_corrupt_cap_did[] = {
0 x16cd,
0 x16f0,
0 xd802,
0 xd804
};
static inline struct iproc_pcie *iproc_data(struct pci_bus *bus)
{
struct iproc_pcie *pcie = bus->sysdata;
return pcie;
}
static inline bool iproc_pcie_reg_is_invalid(u16 reg_offset)
{
return !!(reg_offset == IPROC_PCIE_REG_INVALID);
}
static inline u16 iproc_pcie_reg_offset(struct iproc_pcie *pcie,
enum iproc_pcie_reg reg)
{
return pcie->reg_offsets[reg];
}
static inline u32 iproc_pcie_read_reg(struct iproc_pcie *pcie,
enum iproc_pcie_reg reg)
{
u16 offset = iproc_pcie_reg_offset(pcie, reg);
if (iproc_pcie_reg_is_invalid(offset))
return 0 ;
return readl(pcie->base + offset);
}
static inline void iproc_pcie_write_reg(struct iproc_pcie *pcie,
enum iproc_pcie_reg reg, u32 val)
{
u16 offset = iproc_pcie_reg_offset(pcie, reg);
if (iproc_pcie_reg_is_invalid(offset))
return ;
writel(val, pcie->base + offset);
}
/*
* APB error forwarding can be disabled during access of configuration
* registers of the endpoint device , to prevent unsupported requests
* ( typically seen during enumeration with multi - function devices ) from
* triggering a system exception .
*/
static inline void iproc_pcie_apb_err_disable(struct pci_bus *bus,
bool disable)
{
struct iproc_pcie *pcie = iproc_data(bus);
u32 val;
if (bus->number && pcie->has_apb_err_disable) {
val = iproc_pcie_read_reg(pcie, IPROC_PCIE_APB_ERR_EN);
if (disable)
val &= ~APB_ERR_EN;
else
val |= APB_ERR_EN;
iproc_pcie_write_reg(pcie, IPROC_PCIE_APB_ERR_EN, val);
}
}
static void __iomem *iproc_pcie_map_ep_cfg_reg(struct iproc_pcie *pcie,
unsigned int busno,
unsigned int devfn,
int where)
{
u16 offset;
u32 val;
/* EP device access */
val = ALIGN_DOWN(PCIE_ECAM_OFFSET(busno, devfn, where), 4 ) |
CFG_ADDR_CFG_TYPE_1;
iproc_pcie_write_reg(pcie, IPROC_PCIE_CFG_ADDR, val);
offset = iproc_pcie_reg_offset(pcie, IPROC_PCIE_CFG_DATA);
if (iproc_pcie_reg_is_invalid(offset))
return NULL;
return (pcie->base + offset);
}
static unsigned int iproc_pcie_cfg_retry(struct iproc_pcie *pcie,
void __iomem *cfg_data_p)
{
int timeout = CFG_RETRY_STATUS_TIMEOUT_US;
unsigned int data;
u32 status;
/*
* As per PCIe r6 . 0 , sec 2 . 3 . 2 , Config RRS Software Visibility only
* affects config reads of the Vendor ID . For config writes or any
* other config reads , the Root may automatically reissue the
* configuration request again as a new request .
*
* For config reads , this hardware returns CFG_RETRY_STATUS data
* when it receives a RRS completion , regardless of the address of
* the read or the RRS Software Visibility Enable bit . As a
* partial workaround for this , we retry in software any read that
* returns CFG_RETRY_STATUS .
*
* Note that a non - Vendor ID config register may have a value of
* CFG_RETRY_STATUS . If we read that , we can ' t distinguish it from
* a RRS completion , so we will incorrectly retry the read and
* eventually return the wrong data ( 0 xffffffff ) .
*/
data = readl(cfg_data_p);
while (data == CFG_RETRY_STATUS && timeout--) {
/*
* RRS state is set in CFG_RD status register
* This will handle the case where CFG_RETRY_STATUS is
* valid config data .
*/
status = iproc_pcie_read_reg(pcie, IPROC_PCIE_CFG_RD_STATUS);
if (status != CFG_RD_RRS)
return data;
udelay(1 );
data = readl(cfg_data_p);
}
if (data == CFG_RETRY_STATUS)
data = 0 xffffffff;
return data;
}
static void iproc_pcie_fix_cap(struct iproc_pcie *pcie, int where, u32 *val)
{
u32 i, dev_id;
switch (where & ~0 x3) {
case PCI_VENDOR_ID:
dev_id = *val >> 16 ;
/*
* Activate fixup for those controllers that have corrupted
* capability list registers
*/
for (i = 0 ; i < ARRAY_SIZE(iproc_pcie_corrupt_cap_did); i++)
if (dev_id == iproc_pcie_corrupt_cap_did[i])
pcie->fix_paxc_cap = true ;
break ;
case IPROC_PCI_PM_CAP:
if (pcie->fix_paxc_cap) {
/* advertise PM, force next capability to PCIe */
*val &= ~IPROC_PCI_PM_CAP_MASK;
*val |= IPROC_PCI_EXP_CAP << 8 | PCI_CAP_ID_PM;
}
break ;
case IPROC_PCI_EXP_CAP:
if (pcie->fix_paxc_cap) {
/* advertise root port, version 2, terminate here */
*val = (PCI_EXP_TYPE_ROOT_PORT << 4 | 2 ) << 16 |
PCI_CAP_ID_EXP;
}
break ;
case IPROC_PCI_EXP_CAP + PCI_EXP_RTCTL:
/* Don't advertise RRS SV support */
*val &= ~(PCI_EXP_RTCAP_RRS_SV << 16 );
break ;
default :
break ;
}
}
static int iproc_pcie_config_read(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 *val)
{
struct iproc_pcie *pcie = iproc_data(bus);
unsigned int busno = bus->number;
void __iomem *cfg_data_p;
unsigned int data;
int ret;
/* root complex access */
if (busno == 0 ) {
ret = pci_generic_config_read32(bus, devfn, where, size, val);
if (ret == PCIBIOS_SUCCESSFUL)
iproc_pcie_fix_cap(pcie, where, val);
return ret;
}
cfg_data_p = iproc_pcie_map_ep_cfg_reg(pcie, busno, devfn, where);
if (!cfg_data_p)
return PCIBIOS_DEVICE_NOT_FOUND;
data = iproc_pcie_cfg_retry(pcie, cfg_data_p);
*val = data;
if (size <= 2 )
*val = (data >> (8 * (where & 3 ))) & ((1 << (size * 8 )) - 1 );
/*
* For PAXC and PAXCv2 , the total number of PFs that one can enumerate
* depends on the firmware configuration . Unfortunately , due to an ASIC
* bug , unconfigured PFs cannot be properly hidden from the root
* complex . As a result , write access to these PFs will cause bus lock
* up on the embedded processor
*
* Since all unconfigured PFs are left with an incorrect , staled device
* ID of 0 x168e ( PCI_DEVICE_ID_NX2_57810 ) , we try to catch those access
* early here and reject them all
*/
#define DEVICE_ID_MASK 0 xffff0000
#define DEVICE_ID_SHIFT 16
if (pcie->rej_unconfig_pf &&
(where & CFG_ADDR_REG_NUM_MASK) == PCI_VENDOR_ID)
if ((*val & DEVICE_ID_MASK) ==
(PCI_DEVICE_ID_NX2_57810 << DEVICE_ID_SHIFT))
return PCIBIOS_FUNC_NOT_SUPPORTED;
return PCIBIOS_SUCCESSFUL;
}
/*
* Note access to the configuration registers are protected at the higher layer
* by ' pci_lock ' in drivers / pci / access . c
*/
static void __iomem *iproc_pcie_map_cfg_bus(struct iproc_pcie *pcie,
int busno, unsigned int devfn,
int where)
{
u16 offset;
/* root complex access */
if (busno == 0 ) {
if (PCIE_ECAM_DEVFN(devfn) > 0 )
return NULL;
iproc_pcie_write_reg(pcie, IPROC_PCIE_CFG_IND_ADDR,
where & CFG_IND_ADDR_MASK);
offset = iproc_pcie_reg_offset(pcie, IPROC_PCIE_CFG_IND_DATA);
if (iproc_pcie_reg_is_invalid(offset))
return NULL;
else
return (pcie->base + offset);
}
return iproc_pcie_map_ep_cfg_reg(pcie, busno, devfn, where);
}
static void __iomem *iproc_pcie_bus_map_cfg_bus(struct pci_bus *bus,
unsigned int devfn,
int where)
{
return iproc_pcie_map_cfg_bus(iproc_data(bus), bus->number, devfn,
where);
}
static int iproc_pci_raw_config_read32(struct iproc_pcie *pcie,
unsigned int devfn, int where,
int size, u32 *val)
{
void __iomem *addr;
addr = iproc_pcie_map_cfg_bus(pcie, 0 , devfn, where & ~0 x3);
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
*val = readl(addr);
if (size <= 2 )
*val = (*val >> (8 * (where & 3 ))) & ((1 << (size * 8 )) - 1 );
return PCIBIOS_SUCCESSFUL;
}
static int iproc_pci_raw_config_write32(struct iproc_pcie *pcie,
unsigned int devfn, int where,
int size, u32 val)
{
void __iomem *addr;
u32 mask, tmp;
addr = iproc_pcie_map_cfg_bus(pcie, 0 , devfn, where & ~0 x3);
if (!addr)
return PCIBIOS_DEVICE_NOT_FOUND;
if (size == 4 ) {
writel(val, addr);
return PCIBIOS_SUCCESSFUL;
}
mask = ~(((1 << (size * 8 )) - 1 ) << ((where & 0 x3) * 8 ));
tmp = readl(addr) & mask;
tmp |= val << ((where & 0 x3) * 8 );
writel(tmp, addr);
return PCIBIOS_SUCCESSFUL;
}
static int iproc_pcie_config_read32(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 *val)
{
int ret;
struct iproc_pcie *pcie = iproc_data(bus);
iproc_pcie_apb_err_disable(bus, true );
if (pcie->iproc_cfg_read)
ret = iproc_pcie_config_read(bus, devfn, where, size, val);
else
ret = pci_generic_config_read32(bus, devfn, where, size, val);
iproc_pcie_apb_err_disable(bus, false );
return ret;
}
static int iproc_pcie_config_write32(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 val)
{
int ret;
iproc_pcie_apb_err_disable(bus, true );
ret = pci_generic_config_write32(bus, devfn, where, size, val);
iproc_pcie_apb_err_disable(bus, false );
return ret;
}
static struct pci_ops iproc_pcie_ops = {
.map_bus = iproc_pcie_bus_map_cfg_bus,
.read = iproc_pcie_config_read32,
.write = iproc_pcie_config_write32,
};
static void iproc_pcie_perst_ctrl(struct iproc_pcie *pcie, bool assert)
{
u32 val;
/*
* PAXC and the internal emulated endpoint device downstream should not
* be reset . If firmware has been loaded on the endpoint device at an
* earlier boot stage , reset here causes issues .
*/
if (pcie->ep_is_internal)
return ;
if (assert) {
val = iproc_pcie_read_reg(pcie, IPROC_PCIE_CLK_CTRL);
val &= ~EP_PERST_SOURCE_SELECT & ~EP_MODE_SURVIVE_PERST &
~RC_PCIE_RST_OUTPUT;
iproc_pcie_write_reg(pcie, IPROC_PCIE_CLK_CTRL, val);
udelay(250 );
} else {
val = iproc_pcie_read_reg(pcie, IPROC_PCIE_CLK_CTRL);
val |= RC_PCIE_RST_OUTPUT;
iproc_pcie_write_reg(pcie, IPROC_PCIE_CLK_CTRL, val);
msleep(100 );
}
}
int iproc_pcie_shutdown(struct iproc_pcie *pcie)
{
iproc_pcie_perst_ctrl(pcie, true );
msleep(500 );
return 0 ;
}
EXPORT_SYMBOL_GPL(iproc_pcie_shutdown);
static int iproc_pcie_check_link(struct iproc_pcie *pcie)
{
struct device *dev = pcie->dev;
u32 hdr_type, link_ctrl, link_status, class , val;
bool link_is_active = false ;
/*
* PAXC connects to emulated endpoint devices directly and does not
* have a Serdes . Therefore skip the link detection logic here .
*/
if (pcie->ep_is_internal)
return 0 ;
val = iproc_pcie_read_reg(pcie, IPROC_PCIE_LINK_STATUS);
if (!(val & PCIE_PHYLINKUP) || !(val & PCIE_DL_ACTIVE)) {
dev_err(dev, "PHY or data link is INACTIVE!\n" );
return -ENODEV;
}
/* make sure we are not in EP mode */
iproc_pci_raw_config_read32(pcie, 0 , PCI_HEADER_TYPE, 1 , &hdr_type);
if ((hdr_type & PCI_HEADER_TYPE_MASK) != PCI_HEADER_TYPE_BRIDGE) {
dev_err(dev, "in EP mode, hdr=%#02x\n" , hdr_type);
return -EFAULT;
}
/* force class to PCI_CLASS_BRIDGE_PCI_NORMAL (0x060400) */
#define PCI_BRIDGE_CTRL_REG_OFFSET 0 x43c
#define PCI_BRIDGE_CTRL_REG_CLASS_MASK 0 xffffff
iproc_pci_raw_config_read32(pcie, 0 , PCI_BRIDGE_CTRL_REG_OFFSET,
4 , &class );
class &= ~PCI_BRIDGE_CTRL_REG_CLASS_MASK;
class |= PCI_CLASS_BRIDGE_PCI_NORMAL;
iproc_pci_raw_config_write32(pcie, 0 , PCI_BRIDGE_CTRL_REG_OFFSET,
4 , class );
/* check link status to see if link is active */
iproc_pci_raw_config_read32(pcie, 0 , IPROC_PCI_EXP_CAP + PCI_EXP_LNKSTA,
2 , &link_status);
if (link_status & PCI_EXP_LNKSTA_NLW)
link_is_active = true ;
if (!link_is_active) {
/* try GEN 1 link speed */
#define PCI_TARGET_LINK_SPEED_MASK 0 xf
#define PCI_TARGET_LINK_SPEED_GEN2 0 x2
#define PCI_TARGET_LINK_SPEED_GEN1 0 x1
iproc_pci_raw_config_read32(pcie, 0 ,
IPROC_PCI_EXP_CAP + PCI_EXP_LNKCTL2,
4 , &link_ctrl);
if ((link_ctrl & PCI_TARGET_LINK_SPEED_MASK) ==
PCI_TARGET_LINK_SPEED_GEN2) {
link_ctrl &= ~PCI_TARGET_LINK_SPEED_MASK;
link_ctrl |= PCI_TARGET_LINK_SPEED_GEN1;
iproc_pci_raw_config_write32(pcie, 0 ,
IPROC_PCI_EXP_CAP + PCI_EXP_LNKCTL2,
4 , link_ctrl);
msleep(100 );
iproc_pci_raw_config_read32(pcie, 0 ,
IPROC_PCI_EXP_CAP + PCI_EXP_LNKSTA,
2 , &link_status);
if (link_status & PCI_EXP_LNKSTA_NLW)
link_is_active = true ;
}
}
dev_info(dev, "link: %s\n" , link_is_active ? "UP" : "DOWN" );
return link_is_active ? 0 : -ENODEV;
}
static void iproc_pcie_enable(struct iproc_pcie *pcie)
{
iproc_pcie_write_reg(pcie, IPROC_PCIE_INTX_EN, SYS_RC_INTX_MASK);
}
static inline bool iproc_pcie_ob_is_valid(struct iproc_pcie *pcie,
int window_idx)
{
u32 val;
val = iproc_pcie_read_reg(pcie, MAP_REG(IPROC_PCIE_OARR0, window_idx));
return !!(val & OARR_VALID);
}
static inline int iproc_pcie_ob_write(struct iproc_pcie *pcie, int window_idx,
int size_idx, u64 axi_addr, u64 pci_addr)
{
struct device *dev = pcie->dev;
u16 oarr_offset, omap_offset;
/*
* Derive the OARR / OMAP offset from the first pair ( OARR0 / OMAP0 ) based
* on window index .
*/
oarr_offset = iproc_pcie_reg_offset(pcie, MAP_REG(IPROC_PCIE_OARR0,
window_idx));
omap_offset = iproc_pcie_reg_offset(pcie, MAP_REG(IPROC_PCIE_OMAP0,
window_idx));
if (iproc_pcie_reg_is_invalid(oarr_offset) ||
iproc_pcie_reg_is_invalid(omap_offset))
return -EINVAL;
/*
* Program the OARR registers . The upper 32 - bit OARR register is
* always right after the lower 32 - bit OARR register .
*/
writel(lower_32_bits(axi_addr) | (size_idx << OARR_SIZE_CFG_SHIFT) |
OARR_VALID, pcie->base + oarr_offset);
writel(upper_32_bits(axi_addr), pcie->base + oarr_offset + 4 );
/* now program the OMAP registers */
writel(lower_32_bits(pci_addr), pcie->base + omap_offset);
writel(upper_32_bits(pci_addr), pcie->base + omap_offset + 4 );
dev_dbg(dev, "ob window [%d]: offset 0x%x axi %pap pci %pap\n" ,
window_idx, oarr_offset, &axi_addr, &pci_addr);
dev_dbg(dev, "oarr lo 0x%x oarr hi 0x%x\n" ,
readl(pcie->base + oarr_offset),
readl(pcie->base + oarr_offset + 4 ));
dev_dbg(dev, "omap lo 0x%x omap hi 0x%x\n" ,
readl(pcie->base + omap_offset),
readl(pcie->base + omap_offset + 4 ));
return 0 ;
}
/*
* Some iProc SoCs require the SW to configure the outbound address mapping
*
* Outbound address translation :
*
* iproc_pcie_address = axi_address - axi_offset
* OARR = iproc_pcie_address
* OMAP = pci_addr
*
* axi_addr - > iproc_pcie_address - > OARR - > OMAP - > pci_address
*/
static int iproc_pcie_setup_ob(struct iproc_pcie *pcie, u64 axi_addr,
u64 pci_addr, resource_size_t size)
{
struct iproc_pcie_ob *ob = &pcie->ob;
struct device *dev = pcie->dev;
int ret = -EINVAL, window_idx, size_idx;
if (axi_addr < ob->axi_offset) {
dev_err(dev, "axi address %pap less than offset %pap\n" ,
&axi_addr, &ob->axi_offset);
return -EINVAL;
}
/*
* Translate the AXI address to the internal address used by the iProc
* PCIe core before programming the OARR
*/
axi_addr -= ob->axi_offset;
/* iterate through all OARR/OMAP mapping windows */
for (window_idx = ob->nr_windows - 1 ; window_idx >= 0 ; window_idx--) {
const struct iproc_pcie_ob_map *ob_map =
&pcie->ob_map[window_idx];
/*
* If current outbound window is already in use , move on to the
* next one .
*/
if (iproc_pcie_ob_is_valid(pcie, window_idx))
continue ;
/*
* Iterate through all supported window sizes within the
* OARR / OMAP pair to find a match . Go through the window sizes
* in a descending order .
*/
for (size_idx = ob_map->nr_sizes - 1 ; size_idx >= 0 ;
size_idx--) {
resource_size_t window_size =
ob_map->window_sizes[size_idx] * SZ_1M;
/*
* Keep iterating until we reach the last window and
* with the minimal window size at index zero . In this
* case , we take a compromise by mapping it using the
* minimum window size that can be supported
*/
if (size < window_size) {
if (size_idx > 0 || window_idx > 0 )
continue ;
/*
* For the corner case of reaching the minimal
* window size that can be supported on the
* last window
*/
axi_addr = ALIGN_DOWN(axi_addr, window_size);
pci_addr = ALIGN_DOWN(pci_addr, window_size);
size = window_size;
}
if (!IS_ALIGNED(axi_addr, window_size) ||
!IS_ALIGNED(pci_addr, window_size)) {
dev_err(dev,
"axi %pap or pci %pap not aligned\n" ,
&axi_addr, &pci_addr);
return -EINVAL;
}
/*
* Match found ! Program both OARR and OMAP and mark
* them as a valid entry .
*/
ret = iproc_pcie_ob_write(pcie, window_idx, size_idx,
axi_addr, pci_addr);
if (ret)
goto err_ob;
size -= window_size;
if (size == 0 )
return 0 ;
/*
* If we are here , we are done with the current window ,
* but not yet finished all mappings . Need to move on
* to the next window .
*/
axi_addr += window_size;
pci_addr += window_size;
break ;
}
}
err_ob:
dev_err(dev, "unable to configure outbound mapping\n" );
dev_err(dev,
"axi %pap, axi offset %pap, pci %pap, res size %pap\n" ,
&axi_addr, &ob->axi_offset, &pci_addr, &size);
return ret;
}
static int iproc_pcie_map_ranges(struct iproc_pcie *pcie,
struct list_head *resources)
{
struct device *dev = pcie->dev;
struct resource_entry *window;
int ret;
resource_list_for_each_entry(window, resources) {
struct resource *res = window->res;
u64 res_type = resource_type(res);
switch (res_type) {
case IORESOURCE_IO:
case IORESOURCE_BUS:
break ;
case IORESOURCE_MEM:
ret = iproc_pcie_setup_ob(pcie, res->start,
res->start - window->offset,
resource_size(res));
if (ret)
return ret;
break ;
default :
dev_err(dev, "invalid resource %pR\n" , res);
return -EINVAL;
}
}
return 0 ;
}
static inline bool iproc_pcie_ib_is_in_use(struct iproc_pcie *pcie,
int region_idx)
{
const struct iproc_pcie_ib_map *ib_map = &pcie->ib_map[region_idx];
u32 val;
val = iproc_pcie_read_reg(pcie, MAP_REG(IPROC_PCIE_IARR0, region_idx));
return !!(val & (BIT(ib_map->nr_sizes) - 1 ));
}
static inline bool iproc_pcie_ib_check_type(const struct iproc_pcie_ib_map *ib_map,
enum iproc_pcie_ib_map_type type)
{
return !!(ib_map->type == type);
}
static int iproc_pcie_ib_write(struct iproc_pcie *pcie, int region_idx,
int size_idx, int nr_windows, u64 axi_addr,
u64 pci_addr, resource_size_t size)
{
struct device *dev = pcie->dev;
const struct iproc_pcie_ib_map *ib_map = &pcie->ib_map[region_idx];
u16 iarr_offset, imap_offset;
u32 val;
int window_idx;
iarr_offset = iproc_pcie_reg_offset(pcie,
MAP_REG(IPROC_PCIE_IARR0, region_idx));
imap_offset = iproc_pcie_reg_offset(pcie,
MAP_REG(IPROC_PCIE_IMAP0, region_idx));
if (iproc_pcie_reg_is_invalid(iarr_offset) ||
iproc_pcie_reg_is_invalid(imap_offset))
return -EINVAL;
dev_dbg(dev, "ib region [%d]: offset 0x%x axi %pap pci %pap\n" ,
region_idx, iarr_offset, &axi_addr, &pci_addr);
/*
* Program the IARR registers . The upper 32 - bit IARR register is
* always right after the lower 32 - bit IARR register .
*/
writel(lower_32_bits(pci_addr) | BIT(size_idx),
pcie->base + iarr_offset);
writel(upper_32_bits(pci_addr), pcie->base + iarr_offset + 4 );
dev_dbg(dev, "iarr lo 0x%x iarr hi 0x%x\n" ,
readl(pcie->base + iarr_offset),
readl(pcie->base + iarr_offset + 4 ));
/*
* Now program the IMAP registers . Each IARR region may have one or
* more IMAP windows .
*/
size >>= ilog2(nr_windows);
for (window_idx = 0 ; window_idx < nr_windows; window_idx++) {
val = readl(pcie->base + imap_offset);
val |= lower_32_bits(axi_addr) | IMAP_VALID;
writel(val, pcie->base + imap_offset);
writel(upper_32_bits(axi_addr),
pcie->base + imap_offset + ib_map->imap_addr_offset);
dev_dbg(dev, "imap window [%d] lo 0x%x hi 0x%x\n" ,
window_idx, readl(pcie->base + imap_offset),
readl(pcie->base + imap_offset +
ib_map->imap_addr_offset));
imap_offset += ib_map->imap_window_offset;
axi_addr += size;
}
return 0 ;
}
static int iproc_pcie_setup_ib(struct iproc_pcie *pcie,
struct resource_entry *entry,
enum iproc_pcie_ib_map_type type)
{
struct device *dev = pcie->dev;
struct iproc_pcie_ib *ib = &pcie->ib;
int ret;
unsigned int region_idx, size_idx;
u64 axi_addr = entry->res->start;
u64 pci_addr = entry->res->start - entry->offset;
resource_size_t size = resource_size(entry->res);
/* iterate through all IARR mapping regions */
for (region_idx = 0 ; region_idx < ib->nr_regions; region_idx++) {
const struct iproc_pcie_ib_map *ib_map =
&pcie->ib_map[region_idx];
/*
* If current inbound region is already in use or not a
* compatible type , move on to the next .
*/
if (iproc_pcie_ib_is_in_use(pcie, region_idx) ||
!iproc_pcie_ib_check_type(ib_map, type))
continue ;
/* iterate through all supported region sizes to find a match */
for (size_idx = 0 ; size_idx < ib_map->nr_sizes; size_idx++) {
resource_size_t region_size =
ib_map->region_sizes[size_idx] * ib_map->size_unit;
if (size != region_size)
continue ;
if (!IS_ALIGNED(axi_addr, region_size) ||
!IS_ALIGNED(pci_addr, region_size)) {
dev_err(dev,
"axi %pap or pci %pap not aligned\n" ,
&axi_addr, &pci_addr);
return -EINVAL;
}
/* Match found! Program IARR and all IMAP windows. */
ret = iproc_pcie_ib_write(pcie, region_idx, size_idx,
ib_map->nr_windows, axi_addr,
pci_addr, size);
if (ret)
goto err_ib;
else
return 0 ;
}
}
ret = -EINVAL;
err_ib:
dev_err(dev, "unable to configure inbound mapping\n" );
dev_err(dev, "axi %pap, pci %pap, res size %pap\n" ,
&axi_addr, &pci_addr, &size);
return ret;
}
static int iproc_pcie_map_dma_ranges(struct iproc_pcie *pcie)
{
struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
struct resource_entry *entry;
int ret = 0 ;
resource_list_for_each_entry(entry, &host->dma_ranges) {
/* Each range entry corresponds to an inbound mapping region */
ret = iproc_pcie_setup_ib(pcie, entry, IPROC_PCIE_IB_MAP_MEM);
if (ret)
break ;
}
return ret;
}
static void iproc_pcie_invalidate_mapping(struct iproc_pcie *pcie)
{
struct iproc_pcie_ib *ib = &pcie->ib;
struct iproc_pcie_ob *ob = &pcie->ob;
int idx;
if (pcie->ep_is_internal)
return ;
if (pcie->need_ob_cfg) {
/* iterate through all OARR mapping regions */
for (idx = ob->nr_windows - 1 ; idx >= 0 ; idx--) {
iproc_pcie_write_reg(pcie,
MAP_REG(IPROC_PCIE_OARR0, idx), 0 );
}
}
if (pcie->need_ib_cfg) {
/* iterate through all IARR mapping regions */
for (idx = 0 ; idx < ib->nr_regions; idx++) {
iproc_pcie_write_reg(pcie,
MAP_REG(IPROC_PCIE_IARR0, idx), 0 );
}
}
}
static int iproce_pcie_get_msi(struct iproc_pcie *pcie,
struct device_node *msi_node,
u64 *msi_addr)
{
struct device *dev = pcie->dev;
int ret;
struct resource res;
/*
* Check if ' msi - map ' points to ARM GICv3 ITS , which is the only
* supported external MSI controller that requires steering .
*/
if (!of_device_is_compatible(msi_node, "arm,gic-v3-its" )) {
dev_err(dev, "unable to find compatible MSI controller\n" );
return -ENODEV;
}
/* derive GITS_TRANSLATER address from GICv3 */
ret = of_address_to_resource(msi_node, 0 , &res);
if (ret < 0 ) {
dev_err(dev, "unable to obtain MSI controller resources\n" );
return ret;
}
*msi_addr = res.start + GITS_TRANSLATER;
return 0 ;
}
static int iproc_pcie_paxb_v2_msi_steer(struct iproc_pcie *pcie, u64 msi_addr)
{
int ret;
struct resource_entry entry;
memset(&entry, 0 , sizeof (entry));
entry.res = &entry.__res;
msi_addr &= ~(SZ_32K - 1 );
entry.res->start = msi_addr;
entry.res->end = msi_addr + SZ_32K - 1 ;
ret = iproc_pcie_setup_ib(pcie, &entry, IPROC_PCIE_IB_MAP_IO);
return ret;
}
static void iproc_pcie_paxc_v2_msi_steer(struct iproc_pcie *pcie, u64 msi_addr,
bool enable)
{
u32 val;
if (!enable) {
/*
* Disable PAXC MSI steering . All write transfers will be
* treated as non - MSI transfers
*/
val = iproc_pcie_read_reg(pcie, IPROC_PCIE_MSI_EN_CFG);
val &= ~MSI_ENABLE_CFG;
iproc_pcie_write_reg(pcie, IPROC_PCIE_MSI_EN_CFG, val);
return ;
}
/*
* Program bits [ 43 : 13 ] of address of GITS_TRANSLATER register into
* bits [ 30 : 0 ] of the MSI base address register . In fact , in all iProc
* based SoCs , all I / O register bases are well below the 32 - bit
* boundary , so we can safely assume bits [ 43 : 32 ] are always zeros .
*/
iproc_pcie_write_reg(pcie, IPROC_PCIE_MSI_BASE_ADDR,
(u32)(msi_addr >> 13 ));
/* use a default 8K window size */
iproc_pcie_write_reg(pcie, IPROC_PCIE_MSI_WINDOW_SIZE, 0 );
/* steering MSI to GICv3 ITS */
val = iproc_pcie_read_reg(pcie, IPROC_PCIE_MSI_GIC_MODE);
val |= GIC_V3_CFG;
iproc_pcie_write_reg(pcie, IPROC_PCIE_MSI_GIC_MODE, val);
/*
* Program bits [ 43 : 2 ] of address of GITS_TRANSLATER register into the
* iProc MSI address registers .
*/
msi_addr >>= 2 ;
iproc_pcie_write_reg(pcie, IPROC_PCIE_MSI_ADDR_HI,
upper_32_bits(msi_addr));
iproc_pcie_write_reg(pcie, IPROC_PCIE_MSI_ADDR_LO,
lower_32_bits(msi_addr));
/* enable MSI */
val = iproc_pcie_read_reg(pcie, IPROC_PCIE_MSI_EN_CFG);
val |= MSI_ENABLE_CFG;
iproc_pcie_write_reg(pcie, IPROC_PCIE_MSI_EN_CFG, val);
}
static int iproc_pcie_msi_steer(struct iproc_pcie *pcie,
struct device_node *msi_node)
{
struct device *dev = pcie->dev;
int ret;
u64 msi_addr;
ret = iproce_pcie_get_msi(pcie, msi_node, &msi_addr);
if (ret < 0 ) {
dev_err(dev, "msi steering failed\n" );
return ret;
}
switch (pcie->type) {
case IPROC_PCIE_PAXB_V2:
ret = iproc_pcie_paxb_v2_msi_steer(pcie, msi_addr);
if (ret)
return ret;
break ;
case IPROC_PCIE_PAXC_V2:
iproc_pcie_paxc_v2_msi_steer(pcie, msi_addr, true );
break ;
default :
return -EINVAL;
}
return 0 ;
}
static int iproc_pcie_msi_enable(struct iproc_pcie *pcie)
{
struct device_node *msi_node;
int ret;
/*
* Either the " msi - parent " or the " msi - map " phandle needs to exist
* for us to obtain the MSI node .
*/
msi_node = of_parse_phandle(pcie->dev->of_node, "msi-parent" , 0 );
if (!msi_node) {
const __be32 *msi_map = NULL;
int len;
u32 phandle;
msi_map = of_get_property(pcie->dev->of_node, "msi-map" , &len);
if (!msi_map)
return -ENODEV;
phandle = be32_to_cpup(msi_map + 1 );
msi_node = of_find_node_by_phandle(phandle);
if (!msi_node)
return -ENODEV;
}
/*
* Certain revisions of the iProc PCIe controller require additional
* configurations to steer the MSI writes towards an external MSI
* controller .
*/
if (pcie->need_msi_steer) {
ret = iproc_pcie_msi_steer(pcie, msi_node);
if (ret)
goto out_put_node;
}
/*
* If another MSI controller is being used , the call below should fail
* but that is okay
*/
ret = iproc_msi_init(pcie, msi_node);
out_put_node:
of_node_put(msi_node);
return ret;
}
static void iproc_pcie_msi_disable(struct iproc_pcie *pcie)
{
iproc_msi_exit(pcie);
}
static int iproc_pcie_rev_init(struct iproc_pcie *pcie)
{
struct device *dev = pcie->dev;
unsigned int reg_idx;
const u16 *regs;
switch (pcie->type) {
case IPROC_PCIE_PAXB_BCMA:
regs = iproc_pcie_reg_paxb_bcma;
break ;
case IPROC_PCIE_PAXB:
regs = iproc_pcie_reg_paxb;
pcie->has_apb_err_disable = true ;
if (pcie->need_ob_cfg) {
pcie->ob_map = paxb_ob_map;
pcie->ob.nr_windows = ARRAY_SIZE(paxb_ob_map);
}
break ;
case IPROC_PCIE_PAXB_V2:
regs = iproc_pcie_reg_paxb_v2;
pcie->iproc_cfg_read = true ;
pcie->has_apb_err_disable = true ;
if (pcie->need_ob_cfg) {
pcie->ob_map = paxb_v2_ob_map;
pcie->ob.nr_windows = ARRAY_SIZE(paxb_v2_ob_map);
}
pcie->ib.nr_regions = ARRAY_SIZE(paxb_v2_ib_map);
pcie->ib_map = paxb_v2_ib_map;
pcie->need_msi_steer = true ;
dev_warn(dev, "reads of config registers that contain %#x return incorrect data\n" ,
CFG_RETRY_STATUS);
break ;
case IPROC_PCIE_PAXC:
regs = iproc_pcie_reg_paxc;
pcie->ep_is_internal = true ;
pcie->iproc_cfg_read = true ;
pcie->rej_unconfig_pf = true ;
break ;
case IPROC_PCIE_PAXC_V2:
regs = iproc_pcie_reg_paxc_v2;
pcie->ep_is_internal = true ;
pcie->iproc_cfg_read = true ;
pcie->rej_unconfig_pf = true ;
pcie->need_msi_steer = true ;
break ;
default :
dev_err(dev, "incompatible iProc PCIe interface\n" );
return -EINVAL;
}
pcie->reg_offsets = devm_kcalloc(dev, IPROC_PCIE_MAX_NUM_REG,
sizeof (*pcie->reg_offsets),
GFP_KERNEL);
if (!pcie->reg_offsets)
return -ENOMEM;
/* go through the register table and populate all valid registers */
pcie->reg_offsets[0 ] = (pcie->type == IPROC_PCIE_PAXC_V2) ?
IPROC_PCIE_REG_INVALID : regs[0 ];
for (reg_idx = 1 ; reg_idx < IPROC_PCIE_MAX_NUM_REG; reg_idx++)
pcie->reg_offsets[reg_idx] = regs[reg_idx] ?
regs[reg_idx] : IPROC_PCIE_REG_INVALID;
return 0 ;
}
int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
{
struct device *dev;
int ret;
struct pci_dev *pdev;
struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
dev = pcie->dev;
ret = iproc_pcie_rev_init(pcie);
if (ret) {
dev_err(dev, "unable to initialize controller parameters\n" );
return ret;
}
ret = phy_init(pcie->phy);
if (ret) {
dev_err(dev, "unable to initialize PCIe PHY\n" );
return ret;
}
ret = phy_power_on(pcie->phy);
if (ret) {
dev_err(dev, "unable to power on PCIe PHY\n" );
goto err_exit_phy;
}
iproc_pcie_perst_ctrl(pcie, true );
iproc_pcie_perst_ctrl(pcie, false );
iproc_pcie_invalidate_mapping(pcie);
if (pcie->need_ob_cfg) {
ret = iproc_pcie_map_ranges(pcie, res);
if (ret) {
dev_err(dev, "map failed\n" );
goto err_power_off_phy;
}
}
if (pcie->need_ib_cfg) {
ret = iproc_pcie_map_dma_ranges(pcie);
if (ret && ret != -ENOENT)
goto err_power_off_phy;
}
ret = iproc_pcie_check_link(pcie);
if (ret) {
dev_err(dev, "no PCIe EP device detected\n" );
goto err_power_off_phy;
}
iproc_pcie_enable(pcie);
if (IS_ENABLED(CONFIG_PCI_MSI))
if (iproc_pcie_msi_enable(pcie))
dev_info(dev, "not using iProc MSI\n" );
host->ops = &iproc_pcie_ops;
host->sysdata = pcie;
host->map_irq = pcie->map_irq;
ret = pci_host_probe(host);
if (ret < 0 ) {
dev_err(dev, "failed to scan host: %d\n" , ret);
goto err_power_off_phy;
}
for_each_pci_bridge(pdev, host->bus) {
if (pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT)
pcie_print_link_status(pdev);
}
return 0 ;
err_power_off_phy:
phy_power_off(pcie->phy);
err_exit_phy:
phy_exit(pcie->phy);
return ret;
}
EXPORT_SYMBOL(iproc_pcie_setup);
void iproc_pcie_remove(struct iproc_pcie *pcie)
{
struct pci_host_bridge *host = pci_host_bridge_from_priv(pcie);
pci_stop_root_bus(host->bus);
pci_remove_root_bus(host->bus);
iproc_pcie_msi_disable(pcie);
phy_power_off(pcie->phy);
phy_exit(pcie->phy);
}
EXPORT_SYMBOL(iproc_pcie_remove);
/*
* The MSI parsing logic in certain revisions of Broadcom PAXC based root
* complex does not work and needs to be disabled
*/
static void quirk_paxc_disable_msi_parsing(struct pci_dev *pdev)
{
struct iproc_pcie *pcie = iproc_data(pdev->bus);
if (pdev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
iproc_pcie_paxc_v2_msi_steer(pcie, 0 , false );
}
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0 x16f0,
quirk_paxc_disable_msi_parsing);
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0 xd802,
quirk_paxc_disable_msi_parsing);
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0 xd804,
quirk_paxc_disable_msi_parsing);
static void quirk_paxc_bridge(struct pci_dev *pdev)
{
/*
* The PCI config space is shared with the PAXC root port and the first
* Ethernet device . So , we need to workaround this by telling the PCI
* code that the bridge is not an Ethernet device .
*/
if (pdev->hdr_type == PCI_HEADER_TYPE_BRIDGE)
pdev->class = PCI_CLASS_BRIDGE_PCI_NORMAL;
/*
* MPSS is not being set properly ( as it is currently 0 ) . This is
* because that area of the PCI config space is hard coded to zero , and
* is not modifiable by firmware . Set this to 2 ( e . g . , 512 byte MPS )
* so that the MPS can be set to the real max value .
*/
pdev->pcie_mpss = 2 ;
}
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0 x16cd, quirk_paxc_bridge);
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0 x16f0, quirk_paxc_bridge);
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0 xd750, quirk_paxc_bridge);
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0 xd802, quirk_paxc_bridge);
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_BROADCOM, 0 xd804, quirk_paxc_bridge);
MODULE_AUTHOR("Ray Jui <rjui@broadcom.com>" );
MODULE_DESCRIPTION("Broadcom iPROC PCIe common driver" );
MODULE_LICENSE("GPL v2" );
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