blob: df20c909102f6ec720234e1b476316394a5fd0bb [file] [log] [blame]
/*
* Copyright (C) 2009 - 2013 Broadcom Corporation
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include <linux/init.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/compiler.h>
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/list.h>
#include <linux/printk.h>
#include <linux/syscore_ops.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <linux/module.h>
#include <linux/irqdomain.h>
/* Broadcom PCIE Offsets */
#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
#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_MSI_BAR_CONFIG_LO 0x4044
#define PCIE_MISC_MSI_BAR_CONFIG_HI 0x4048
#define PCIE_MISC_PCIE_CTRL 0x4064
#define PCIE_MISC_PCIE_STATUS 0x4068
#define PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT 0x4070
#define PCIE_MISC_HARD_PCIE_HARD_DEBUG 0x4204
#define PCIE_INTR2_CPU_CLEAR 0x4308
#define PCIE_INTR2_CPU_MASK_SET 0x4310
#define PCIE_INTR2_CPU_MASK_CLEAR 0x4314
#define PCIE_EXT_CFG_PCIE_EXT_CFG_INDEX 0x9000
#define PCIE_EXT_CFG_PCIE_EXT_CFG_DATA 0x9004
#define PCIE_RGR1_SW_INIT_1 0x9210
#define BRCM_NUM_PCI_OUT_WINS 0x4
#define BRCM_MAX_SCB 0x4
#define PCI_BUSNUM_SHIFT 20
#define PCI_SLOT_SHIFT 15
#define PCI_FUNC_SHIFT 12
#define IDX_ADDR(base) ((base) + PCIE_EXT_CFG_PCIE_EXT_CFG_INDEX)
#define DATA_ADDR(base) ((base) + PCIE_EXT_CFG_PCIE_EXT_CFG_DATA)
static int brcm_pci_read_config(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 *data);
static int brcm_pci_write_config(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 data);
static struct pci_ops brcm_pci_ops = {
.read = brcm_pci_read_config,
.write = brcm_pci_write_config,
};
static int brcm_setup_pcie_bridge(int nr, struct pci_sys_data *sys);
static int __init brcm_map_irq(const struct pci_dev *dev, u8 slot, u8 pin);
static struct hw_pci brcm_pcie_hw __initdata = {
.nr_controllers = 0,
.setup = brcm_setup_pcie_bridge,
.map_irq = brcm_map_irq,
.ops = &brcm_pci_ops,
};
struct brcm_window {
u64 pci_addr;
u64 size;
u64 cpu_addr;
u32 info;
struct resource pcie_iomem_res;
};
/* Internal Bus Controller Information.*/
struct brcm_pcie {
struct list_head list;
void __iomem *base;
char name[8];
bool suspended;
struct clk *clk;
struct device_node *dn;
int pcie_irq[4];
int num_out_wins;
bool ssc;
int gen;
int scb_size_vals[BRCM_MAX_SCB];
struct brcm_window out_wins[BRCM_NUM_PCI_OUT_WINS];
struct pci_sys_data *sys;
struct device *dev;
};
static struct list_head brcm_pcie;
static int brcm_num_pci_controllers;
static int num_memc;
static void turn_off(void __iomem *base);
static void enter_l23(struct brcm_pcie *pcie);
/***********************************************************************
* PCIe Bridge setup
***********************************************************************/
#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
static void remove_pcie(struct brcm_pcie *pcie)
{
struct list_head *pos, *q;
struct brcm_pcie *tmp;
list_for_each_safe(pos, q, &brcm_pcie) {
tmp = list_entry(pos, struct brcm_pcie, list);
if (tmp == pcie) {
list_del(pos);
break;
}
}
}
/* negative return value indicates error */
static int mdio_read(void __iomem *base, u8 phyad, u8 regad)
{
u32 data = ((phyad & 0xf) << 16)
| (regad & 0x1f)
| 0x100000;
__raw_writel(data, base + PCIE_RC_DL_MDIO_ADDR);
__raw_readl(base + PCIE_RC_DL_MDIO_ADDR);
data = __raw_readl(base + PCIE_RC_DL_MDIO_RD_DATA);
if (!(data & 0x80000000)) {
mdelay(1);
data = __raw_readl(base + PCIE_RC_DL_MDIO_RD_DATA);
}
return (data & 0x80000000) ? (data & 0xffff) : -EIO;
}
/* negative return value indicates error */
static int mdio_write(void __iomem *base, u8 phyad, u8 regad, u16 wrdata)
{
u32 data = ((phyad & 0xf) << 16) | (regad & 0x1f);
__raw_writel(data, base + PCIE_RC_DL_MDIO_ADDR);
__raw_readl(base + PCIE_RC_DL_MDIO_ADDR);
__raw_writel(0x80000000 | wrdata, base + PCIE_RC_DL_MDIO_WR_DATA);
data = __raw_readl(base + PCIE_RC_DL_MDIO_WR_DATA);
if (!(data & 0x80000000)) {
mdelay(1);
data = __raw_readl(base + PCIE_RC_DL_MDIO_WR_DATA);
}
return (data & 0x80000000) ? 0 : -EIO;
}
static void wr_fld(void __iomem *p, u32 mask, int shift, u32 val)
{
u32 reg = __raw_readl(p);
reg = (reg & ~mask) | (val << shift);
__raw_writel(reg, p);
}
static void wr_fld_rb(void __iomem *p, u32 mask, int shift, u32 val)
{
wr_fld(p, mask, shift, val);
(void) __raw_readl(p);
}
/* configures device for ssc mode; negative return value indicates error */
static int set_ssc(void __iomem *base)
{
int tmp;
u16 wrdata;
tmp = mdio_write(base, 0, 0x1f, 0x1100);
if (tmp < 0)
return tmp;
tmp = mdio_read(base, 0, 2);
if (tmp < 0)
return tmp;
wrdata = ((u16)tmp & 0x3fff) | 0xc000;
tmp = mdio_write(base, 0, 2, wrdata);
if (tmp < 0)
return tmp;
mdelay(1);
tmp = mdio_read(base, 0, 1);
if (tmp < 0)
return tmp;
return 0;
}
/* returns 0 if in ssc mode, 1 if not, <0 on error */
static int is_ssc(void __iomem *base)
{
int tmp = mdio_write(base, 0, 0x1f, 0x1100);
if (tmp < 0)
return tmp;
tmp = mdio_read(base, 0, 1);
if (tmp < 0)
return tmp;
return (tmp & 0xc00) == 0xc00 ? 0 : 1;
}
/* 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, 0xf, 0, gen);
wr_fld(base + PCIE_RC_CFG_PCIE_LINK_STATUS_CONTROL_2, 0xf, 0, gen);
}
static void set_pcie_outbound_win(void __iomem *base, unsigned win, u64 start,
u64 len)
{
u32 tmp;
__raw_writel((u32)(start) + MMIO_ENDIAN,
base + PCIE_MISC_CPU_2_PCIE_MEM_WIN0_LO+(win*8));
__raw_writel((u32)(start >> 32),
base + PCIE_MISC_CPU_2_PCIE_MEM_WIN0_HI+(win*8));
tmp = ((((u32)start) >> 20) << 4)
| (((((u32)start) + ((u32)len) - 1) >> 20) << 20);
__raw_writel(tmp,
base + PCIE_MISC_CPU_2_PCIE_MEM_WIN0_BASE_LIMIT+(win*4));
}
static int is_pcie_link_up(struct brcm_pcie *pcie)
{
void __iomem *base = pcie->base;
u32 val = __raw_readl(base + PCIE_MISC_PCIE_STATUS);
return ((val & 0x30) == 0x30) ? 1 : 0;
}
static void brcm_pcie_setup_early(struct brcm_pcie *pcie)
{
void __iomem *base = pcie->base;
unsigned int scb_size_val;
int i;
/* reset the bridge and the endpoint device */
/* field: PCIE_BRIDGE_SW_INIT = 1 */
wr_fld_rb(base + PCIE_RGR1_SW_INIT_1, 0x00000002, 1, 1);
/* field: PCIE_SW_PERST = 1 */
wr_fld_rb(base + PCIE_RGR1_SW_INIT_1, 0x00000001, 0, 1);
/* delay 100us */
udelay(100);
/* take the bridge out of reset */
/* field: PCIE_BRIDGE_SW_INIT = 0 */
wr_fld_rb(base + PCIE_RGR1_SW_INIT_1, 0x00000002, 1, 0);
/* enable SCB_MAX_BURST_SIZE | CSR_READ_UR_MODE | SCB_ACCESS_EN */
__raw_writel(0x81e03000, base + PCIE_MISC_MISC_CTRL);
for (i = 0; i < pcie->num_out_wins; i++) {
struct brcm_window *w = &pcie->out_wins[i];
set_pcie_outbound_win(base, i, w->cpu_addr, w->size);
}
/* set up 4GB PCIE->SCB memory window on BAR2 */
__raw_writel(0x00000011, base + PCIE_MISC_RC_BAR2_CONFIG_LO);
__raw_writel(0x00000000, base + PCIE_MISC_RC_BAR2_CONFIG_HI);
/* field: SCB0_SIZE, default = 0xf (1 GB) */
scb_size_val = pcie->scb_size_vals[0] ? pcie->scb_size_vals[0] : 0xf;
wr_fld(base + PCIE_MISC_MISC_CTRL, 0xf8000000, 27, scb_size_val);
/* field: SCB1_SIZE, default = 0xf (1 GB) */
if (num_memc > 1) {
scb_size_val = pcie->scb_size_vals[1]
? pcie->scb_size_vals[1] : 0xf;
wr_fld(base + PCIE_MISC_MISC_CTRL, 0x07c00000,
22, scb_size_val);
}
/* field: SCB2_SIZE, default = 0xf (1 GB) */
if (num_memc > 2) {
scb_size_val = pcie->scb_size_vals[2]
? pcie->scb_size_vals[2] : 0xf;
wr_fld(base + PCIE_MISC_MISC_CTRL, 0x0000001f,
0, scb_size_val);
}
/* disable the PCIE->GISB memory window */
__raw_writel(0x00000000, base + PCIE_MISC_RC_BAR1_CONFIG_LO);
/* disable the PCIE->SCB memory window */
__raw_writel(0x00000000, base + PCIE_MISC_RC_BAR3_CONFIG_LO);
/* disable MSI (for now...) */
__raw_writel(0x00000000, base + PCIE_MISC_MSI_BAR_CONFIG_LO);
/* set up L2 interrupt masks */
__raw_writel(0x00000000, base + PCIE_INTR2_CPU_CLEAR);
(void) __raw_readl(base + PCIE_INTR2_CPU_CLEAR);
__raw_writel(0x00000000, base + PCIE_INTR2_CPU_MASK_CLEAR);
(void) __raw_readl(base + PCIE_INTR2_CPU_MASK_CLEAR);
__raw_writel(0xffffffff, base + PCIE_INTR2_CPU_MASK_SET);
(void) __raw_readl(base + PCIE_INTR2_CPU_MASK_SET);
if (pcie->ssc)
if (set_ssc(base))
dev_err(pcie->dev, "error while configuring ssc mode\n");
if (pcie->gen)
set_gen(base, pcie->gen);
/* take the EP device out of reset */
/* field: PCIE_SW_PERST = 0 */
wr_fld_rb(base + PCIE_RGR1_SW_INIT_1, 0x00000001, 0, 0);
}
static int brcm_setup_pcie_bridge(int nr, struct pci_sys_data *sys)
{
struct brcm_pcie *pcie = sys->private_data;
void __iomem *base = pcie->base;
const int limit = pcie->suspended ? 1000 : 100;
struct clk *clk;
unsigned status;
static const char *link_speed[4] = { "???", "2.5", "5.0", "8.0" };
int i, j;
pcie->sys = sys;
/* 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); j += i, i = i*2)
mdelay(i + j > limit ? limit - j : i);
if (!is_pcie_link_up(pcie)) {
dev_info(pcie->dev, "link down\n");
goto FAIL;
}
/* 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, 0x00ffffff, 0, 0x060400);
if (!pcie->suspended)
for (i = 0; i < pcie->num_out_wins; i++)
pci_add_resource_offset(&sys->resources,
&pcie->out_wins[i].pcie_iomem_res,
sys->mem_offset);
status = __raw_readl(base + PCIE_RC_CFG_PCIE_LINK_STATUS_CONTROL);
dev_info(pcie->dev, "link up, %s Gbps x%u\n",
link_speed[((status & 0x000f0000) >> 16) & 0x3],
(status & 0x03f00000) >> 20);
if (pcie->ssc && is_ssc(base) != 0)
dev_err(pcie->dev, "failed to enter ssc mode\n");
/* Enable configuration request retry (see pci_scan_device()) */
/* field RC_CRS_EN = 1 */
wr_fld(base + PCIE_RC_CFG_PCIE_ROOT_CAP_CONTROL, 0x00000010, 4, 1);
/* PCIE->SCB endian mode for BAR */
/* field ENDIAN_MODE_BAR2 = DATA_ENDIAN */
wr_fld_rb(base + PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1, 0x0000000c, 2,
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, 0x00000002, 1, 1);
return 1;
FAIL:
if (IS_ENABLED(CONFIG_PM))
turn_off(base);
clk = pcie->clk;
if (pcie->suspended)
clk_disable(clk);
else {
clk_disable_unprepare(clk);
clk_put(clk);
remove_pcie(pcie);
}
return 0;
}
/*
* syscore device to handle PCIe bus suspend and resume
*/
static void turn_off(void __iomem *base)
{
/* Reset endpoint device */
wr_fld_rb(base + PCIE_RGR1_SW_INIT_1, 0x00000001, 0, 1);
/* deassert request for L23 in case it was asserted */
wr_fld_rb(base + PCIE_MISC_PCIE_CTRL, 0x1, 0, 0);
/* SERDES_IDDQ = 1 */
wr_fld_rb(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG, 0x08000000,
27, 1);
/* Shutdown PCIe bridge */
wr_fld_rb(base + PCIE_RGR1_SW_INIT_1, 0x00000002, 1, 1);
}
static void enter_l23(struct brcm_pcie *pcie)
{
void __iomem *base = pcie->base;
int timeout = 1000;
int l23;
/* assert request for L23 */
wr_fld_rb(base + PCIE_MISC_PCIE_CTRL, 0x1, 0, 1);
do {
/* poll L23 status */
l23 = __raw_readl(base + PCIE_MISC_PCIE_STATUS) & (1 << 6);
} while (--timeout && !l23);
if (!timeout)
dev_err(pcie->dev, "failed to enter L23\n");
}
static int pcie_suspend(void)
{
struct brcm_pcie *pcie;
list_for_each_entry(pcie, &brcm_pcie, list) {
enter_l23(pcie);
turn_off(pcie->base);
clk_disable(pcie->clk);
pcie->suspended = true;
}
return 0;
}
static void pcie_resume(void)
{
int i = 0;
struct brcm_pcie *pcie;
list_for_each_entry(pcie, &brcm_pcie, list) {
void __iomem *base;
base = pcie->base;
clk_enable(pcie->clk);
/* Take bridge out of reset so we can access the SERDES reg */
wr_fld_rb(base + PCIE_RGR1_SW_INIT_1, 0x00000002, 1, 0);
/* SERDES_IDDQ = 0 */
wr_fld_rb(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG, 0x08000000,
27, 0);
/* wait for serdes to be stable */
udelay(100);
brcm_pcie_setup_early(pcie);
}
list_for_each_entry(pcie, &brcm_pcie, list) {
brcm_setup_pcie_bridge(i++, pcie->sys);
pcie->suspended = false;
}
}
static struct syscore_ops pcie_pm_ops = {
.suspend = pcie_suspend,
.resume = pcie_resume,
};
/***********************************************************************
* Read/write PCI configuration registers
***********************************************************************/
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 u32 read_config(void __iomem *base, int cfg_idx)
{
__raw_writel(cfg_idx, IDX_ADDR(base));
__raw_readl(IDX_ADDR(base));
return __raw_readl(DATA_ADDR(base));
}
static void write_config(void __iomem *base, int cfg_idx, u32 val)
{
__raw_writel(cfg_idx, IDX_ADDR(base));
__raw_readl(IDX_ADDR(base));
__raw_writel(val, DATA_ADDR(base));
__raw_readl(DATA_ADDR(base));
}
static int brcm_pci_write_config(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 data)
{
u32 val = 0, mask, shift;
struct pci_sys_data *sys = bus->sysdata;
struct brcm_pcie *pcie = sys->private_data;
void __iomem *base;
bool rc_access;
int idx;
if (!is_pcie_link_up(pcie))
return PCIBIOS_DEVICE_NOT_FOUND;
base = pcie->base;
rc_access = sys->busnr == bus->number;
idx = cfg_index(bus->number, devfn, where);
BUG_ON(((where & 3) + size) > 4);
if (rc_access && PCI_SLOT(devfn))
return PCIBIOS_DEVICE_NOT_FOUND;
if (size < 4) {
/* partial word - read, modify, write */
if (rc_access)
val = __raw_readl(base + (where & ~3));
else
val = read_config(base, idx);
}
shift = (where & 3) << 3;
mask = (0xffffffff >> ((4 - size) << 3)) << shift;
val = (val & ~mask) | ((data << shift) & mask);
if (rc_access) {
__raw_writel(val, base + (where & ~3));
__raw_readl(base + (where & ~3));
} else {
write_config(base, idx, val);
}
return PCIBIOS_SUCCESSFUL;
}
static int brcm_pci_read_config(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 *data)
{
struct pci_sys_data *sys = bus->sysdata;
struct brcm_pcie *pcie = sys->private_data;
u32 val, mask, shift;
void __iomem *base;
bool rc_access;
int idx;
if (!is_pcie_link_up(pcie))
return PCIBIOS_DEVICE_NOT_FOUND;
base = pcie->base;
rc_access = sys->busnr == bus->number;
idx = cfg_index(bus->number, devfn, where);
BUG_ON(((where & 3) + size) > 4);
if (rc_access && PCI_SLOT(devfn)) {
*data = 0xffffffff;
return PCIBIOS_FUNC_NOT_SUPPORTED;
}
if (rc_access)
val = __raw_readl(base + (where & ~3));
else
val = read_config(base, idx);
shift = (where & 3) << 3;
mask = (0xffffffff >> ((4 - size) << 3)) << shift;
*data = (val & mask) >> shift;
return PCIBIOS_SUCCESSFUL;
}
/***********************************************************************
* PCI slot to IRQ mappings (aka "fixup")
***********************************************************************/
static int __init brcm_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
struct pci_sys_data *sys = dev->bus->sysdata;
struct brcm_pcie *pcie = sys->private_data;
if (pcie) {
if ((pin - 1) > 3)
return 0;
return pcie->pcie_irq[pin - 1];
}
return 0;
}
/***********************************************************************
* Per-device initialization
***********************************************************************/
static void __attribute__((__section__("pci_fixup_early")))
brcm_pcibios_fixup(struct pci_dev *dev)
{
struct pci_sys_data *sys = dev->bus->sysdata;
struct brcm_pcie *pcie = sys->private_data;
int 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, brcm_map_irq(dev, slot, 1));
}
DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, brcm_pcibios_fixup);
/***********************************************************************
* PCI Platform Driver
***********************************************************************/
static int __init brcm_pci_probe(struct platform_device *pdev)
{
struct device_node *dn = pdev->dev.of_node, *mdn;
const u32 *imap_prop;
int len, i, irq_offset, rlen, pna, np, ret;
struct brcm_pcie *pcie;
struct resource *r;
const u32 *ranges, *log2_scb_sizes, *dma_ranges;
void __iomem *base;
u32 tmp;
pcie = devm_kzalloc(&pdev->dev, sizeof(struct brcm_pcie), GFP_KERNEL);
if (!pcie)
return -ENOMEM;
/* 'num_memc' will be set only by the first controller, and all
* other controllers will use the value set by the first. */
if (num_memc == 0)
for_each_compatible_node(mdn, NULL, "brcm,brcmstb-memc")
if (of_device_is_available(mdn))
num_memc++;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!r)
return -EINVAL;
base = devm_ioremap_resource(&pdev->dev, r);
if (!base)
return -ENOMEM;
imap_prop = of_get_property(dn, "interrupt-map", &len);
if (imap_prop == NULL) {
dev_err(&pdev->dev, "missing interrupt-map\n");
return -EINVAL;
}
irq_offset = irq_of_parse_and_map(dn, 0);
for (i = 0; i < 4 && i*4 < len; i++)
pcie->pcie_irq[i] = irq_offset
+ of_read_number(imap_prop + (i * 7 + 5), 1);
snprintf(pcie->name,
sizeof(pcie->name)-1, "PCIe%d", brcm_num_pci_controllers);
pcie->suspended = false;
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;
}
ret = clk_prepare_enable(pcie->clk);
if (ret) {
dev_err(&pdev->dev, "could not enable clock\n");
return ret;
}
pcie->dn = dn;
pcie->base = base;
pcie->dev = &pdev->dev;
pcie->gen = 0;
ret = of_property_read_u32(dn, "brcm,gen", &tmp);
if (ret == 0) {
if (tmp > 0 && tmp < 3)
pcie->gen = (int) tmp;
else
dev_warn(pcie->dev, "bad DT value for prop 'brcm,gen");
} else if (ret != -EINVAL) {
dev_warn(pcie->dev, "error reading DT prop 'brcm,gen");
}
pcie->ssc = of_property_read_bool(dn, "brcm,ssc");
/* Get the value for the log2 of the scb sizes. Subtract 15 from
* each because the target register field has 0==disabled and 1==64KB.
*/
log2_scb_sizes = of_get_property(dn, "brcm,log2-scb-sizes", &rlen);
if (log2_scb_sizes != NULL)
for (i = 0; i < rlen/4; i++)
pcie->scb_size_vals[i]
= (int) of_read_number(log2_scb_sizes + i, 1)
- 15;
/* Look for the dma-ranges property. If it exists, issue a warning
* as PCIe drivers may not work. This is because the identity
* mapping between system memory and PCIe space is not preserved,
* and we need Linux to massage the dma_addr_t values it gets
* from dma memory allocation. This functionality will be added
* in the near future.
*/
dma_ranges = of_get_property(dn, "dma-ranges", &rlen);
if (dma_ranges != NULL)
dev_warn(pcie->dev, "no identity map; PCI drivers may fail");
ranges = of_get_property(dn, "ranges", &rlen);
if (ranges == NULL) {
dev_err(pcie->dev, "no ranges property in dev tree.\n");
return -EINVAL;
}
/* set up CPU->PCIE memory windows (max of four) */
pna = of_n_addr_cells(dn);
np = pna + 5;
pcie->num_out_wins = rlen / (np * 4);
for (i = 0; i < pcie->num_out_wins; i++) {
struct brcm_window *w = &pcie->out_wins[i];
w->info = (u32) of_read_ulong(ranges + 0, 1);
w->pci_addr = of_read_number(ranges + 1, 2);
w->cpu_addr = of_translate_address(dn, ranges + 3);
w->size = of_read_number(ranges + pna + 3, 2);
ranges += np;
w->pcie_iomem_res.name = "External PCIe MEM";
w->pcie_iomem_res.flags = IORESOURCE_MEM;
w->pcie_iomem_res.start = w->cpu_addr;
w->pcie_iomem_res.end = w->cpu_addr + w->size - 1;
/* Request memory region resources. */
if (request_resource(&iomem_resource, &w->pcie_iomem_res)) {
dev_err(&pdev->dev,
"request PCIe memory resource failed\n");
return -EIO;
}
}
/*
* Starts PCIe link negotiation immediately at kernel boot time. The
* RC is supposed to give the endpoint device 100ms to settle down
* before attempting configuration accesses. So we let the link
* negotiation happen in the background instead of busy-waiting.
*/
brcm_pcie_setup_early(pcie);
list_add_tail(&pcie->list, &brcm_pcie);
brcm_num_pci_controllers++;
return 0;
}
static const struct of_device_id brcm_pci_match[] = {
{ .compatible = "brcm,pci-plat-dev" },
{},
};
MODULE_DEVICE_TABLE(of, brcm_pci_match);
static struct platform_driver __refdata brcm_pci_driver = {
.probe = brcm_pci_probe,
.driver = {
.name = "brcm-pci",
.owner = THIS_MODULE,
.of_match_table = brcm_pci_match,
},
};
int __init brcm_pcibios_init(void)
{
int ret;
INIT_LIST_HEAD(&brcm_pcie);
ret = platform_driver_probe(&brcm_pci_driver, brcm_pci_probe);
if (!ret && brcm_num_pci_controllers > 0) {
void **private_data;
struct brcm_pcie *pcie;
int i = 0;
brcm_pcie_hw.nr_controllers = brcm_num_pci_controllers;
if (IS_ENABLED(CONFIG_PM))
register_syscore_ops(&pcie_pm_ops);
private_data = kzalloc(brcm_num_pci_controllers
* sizeof(void *), GFP_KERNEL);
if (!private_data)
return -ENOMEM;
list_for_each_entry(pcie, &brcm_pcie, list)
private_data[i++] = pcie;
BUG_ON(i != brcm_num_pci_controllers);
brcm_pcie_hw.private_data = private_data;
pci_common_init(&brcm_pcie_hw);
kfree(brcm_pcie_hw.private_data);
brcm_pcie_hw.private_data = NULL;
}
return ret;
}
arch_initcall(brcm_pcibios_init);