449 lines
12 KiB
C
449 lines
12 KiB
C
/*
|
|
* pci-rcar-gen2: internal PCI bus support
|
|
*
|
|
* Copyright (C) 2013 Renesas Solutions Corp.
|
|
* Copyright (C) 2013 Cogent Embedded, Inc.
|
|
*
|
|
* Author: Valentine Barshak <valentine.barshak@cogentembedded.com>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/delay.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/io.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_pci.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/pm_runtime.h>
|
|
#include <linux/sizes.h>
|
|
#include <linux/slab.h>
|
|
|
|
/* AHB-PCI Bridge PCI communication registers */
|
|
#define RCAR_AHBPCI_PCICOM_OFFSET 0x800
|
|
|
|
#define RCAR_PCIAHB_WIN1_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x00)
|
|
#define RCAR_PCIAHB_WIN2_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x04)
|
|
#define RCAR_PCIAHB_PREFETCH0 0x0
|
|
#define RCAR_PCIAHB_PREFETCH4 0x1
|
|
#define RCAR_PCIAHB_PREFETCH8 0x2
|
|
#define RCAR_PCIAHB_PREFETCH16 0x3
|
|
|
|
#define RCAR_AHBPCI_WIN1_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x10)
|
|
#define RCAR_AHBPCI_WIN2_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x14)
|
|
#define RCAR_AHBPCI_WIN_CTR_MEM (3 << 1)
|
|
#define RCAR_AHBPCI_WIN_CTR_CFG (5 << 1)
|
|
#define RCAR_AHBPCI_WIN1_HOST (1 << 30)
|
|
#define RCAR_AHBPCI_WIN1_DEVICE (1 << 31)
|
|
|
|
#define RCAR_PCI_INT_ENABLE_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x20)
|
|
#define RCAR_PCI_INT_STATUS_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x24)
|
|
#define RCAR_PCI_INT_SIGTABORT (1 << 0)
|
|
#define RCAR_PCI_INT_SIGRETABORT (1 << 1)
|
|
#define RCAR_PCI_INT_REMABORT (1 << 2)
|
|
#define RCAR_PCI_INT_PERR (1 << 3)
|
|
#define RCAR_PCI_INT_SIGSERR (1 << 4)
|
|
#define RCAR_PCI_INT_RESERR (1 << 5)
|
|
#define RCAR_PCI_INT_WIN1ERR (1 << 12)
|
|
#define RCAR_PCI_INT_WIN2ERR (1 << 13)
|
|
#define RCAR_PCI_INT_A (1 << 16)
|
|
#define RCAR_PCI_INT_B (1 << 17)
|
|
#define RCAR_PCI_INT_PME (1 << 19)
|
|
#define RCAR_PCI_INT_ALLERRORS (RCAR_PCI_INT_SIGTABORT | \
|
|
RCAR_PCI_INT_SIGRETABORT | \
|
|
RCAR_PCI_INT_SIGRETABORT | \
|
|
RCAR_PCI_INT_REMABORT | \
|
|
RCAR_PCI_INT_PERR | \
|
|
RCAR_PCI_INT_SIGSERR | \
|
|
RCAR_PCI_INT_RESERR | \
|
|
RCAR_PCI_INT_WIN1ERR | \
|
|
RCAR_PCI_INT_WIN2ERR)
|
|
|
|
#define RCAR_AHB_BUS_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x30)
|
|
#define RCAR_AHB_BUS_MMODE_HTRANS (1 << 0)
|
|
#define RCAR_AHB_BUS_MMODE_BYTE_BURST (1 << 1)
|
|
#define RCAR_AHB_BUS_MMODE_WR_INCR (1 << 2)
|
|
#define RCAR_AHB_BUS_MMODE_HBUS_REQ (1 << 7)
|
|
#define RCAR_AHB_BUS_SMODE_READYCTR (1 << 17)
|
|
#define RCAR_AHB_BUS_MODE (RCAR_AHB_BUS_MMODE_HTRANS | \
|
|
RCAR_AHB_BUS_MMODE_BYTE_BURST | \
|
|
RCAR_AHB_BUS_MMODE_WR_INCR | \
|
|
RCAR_AHB_BUS_MMODE_HBUS_REQ | \
|
|
RCAR_AHB_BUS_SMODE_READYCTR)
|
|
|
|
#define RCAR_USBCTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x34)
|
|
#define RCAR_USBCTR_USBH_RST (1 << 0)
|
|
#define RCAR_USBCTR_PCICLK_MASK (1 << 1)
|
|
#define RCAR_USBCTR_PLL_RST (1 << 2)
|
|
#define RCAR_USBCTR_DIRPD (1 << 8)
|
|
#define RCAR_USBCTR_PCIAHB_WIN2_EN (1 << 9)
|
|
#define RCAR_USBCTR_PCIAHB_WIN1_256M (0 << 10)
|
|
#define RCAR_USBCTR_PCIAHB_WIN1_512M (1 << 10)
|
|
#define RCAR_USBCTR_PCIAHB_WIN1_1G (2 << 10)
|
|
#define RCAR_USBCTR_PCIAHB_WIN1_2G (3 << 10)
|
|
#define RCAR_USBCTR_PCIAHB_WIN1_MASK (3 << 10)
|
|
|
|
#define RCAR_PCI_ARBITER_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x40)
|
|
#define RCAR_PCI_ARBITER_PCIREQ0 (1 << 0)
|
|
#define RCAR_PCI_ARBITER_PCIREQ1 (1 << 1)
|
|
#define RCAR_PCI_ARBITER_PCIBP_MODE (1 << 12)
|
|
|
|
#define RCAR_PCI_UNIT_REV_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x48)
|
|
|
|
struct rcar_pci_priv {
|
|
struct device *dev;
|
|
void __iomem *reg;
|
|
struct resource mem_res;
|
|
struct resource *cfg_res;
|
|
unsigned busnr;
|
|
int irq;
|
|
unsigned long window_size;
|
|
unsigned long window_addr;
|
|
unsigned long window_pci;
|
|
};
|
|
|
|
/* PCI configuration space operations */
|
|
static void __iomem *rcar_pci_cfg_base(struct pci_bus *bus, unsigned int devfn,
|
|
int where)
|
|
{
|
|
struct pci_sys_data *sys = bus->sysdata;
|
|
struct rcar_pci_priv *priv = sys->private_data;
|
|
int slot, val;
|
|
|
|
if (sys->busnr != bus->number || PCI_FUNC(devfn))
|
|
return NULL;
|
|
|
|
/* Only one EHCI/OHCI device built-in */
|
|
slot = PCI_SLOT(devfn);
|
|
if (slot > 2)
|
|
return NULL;
|
|
|
|
/* bridge logic only has registers to 0x40 */
|
|
if (slot == 0x0 && where >= 0x40)
|
|
return NULL;
|
|
|
|
val = slot ? RCAR_AHBPCI_WIN1_DEVICE | RCAR_AHBPCI_WIN_CTR_CFG :
|
|
RCAR_AHBPCI_WIN1_HOST | RCAR_AHBPCI_WIN_CTR_CFG;
|
|
|
|
iowrite32(val, priv->reg + RCAR_AHBPCI_WIN1_CTR_REG);
|
|
return priv->reg + (slot >> 1) * 0x100 + where;
|
|
}
|
|
|
|
/* PCI interrupt mapping */
|
|
static int rcar_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
|
|
{
|
|
struct pci_sys_data *sys = dev->bus->sysdata;
|
|
struct rcar_pci_priv *priv = sys->private_data;
|
|
int irq;
|
|
|
|
irq = of_irq_parse_and_map_pci(dev, slot, pin);
|
|
if (!irq)
|
|
irq = priv->irq;
|
|
|
|
return irq;
|
|
}
|
|
|
|
#ifdef CONFIG_PCI_DEBUG
|
|
/* if debug enabled, then attach an error handler irq to the bridge */
|
|
|
|
static irqreturn_t rcar_pci_err_irq(int irq, void *pw)
|
|
{
|
|
struct rcar_pci_priv *priv = pw;
|
|
struct device *dev = priv->dev;
|
|
u32 status = ioread32(priv->reg + RCAR_PCI_INT_STATUS_REG);
|
|
|
|
if (status & RCAR_PCI_INT_ALLERRORS) {
|
|
dev_err(dev, "error irq: status %08x\n", status);
|
|
|
|
/* clear the error(s) */
|
|
iowrite32(status & RCAR_PCI_INT_ALLERRORS,
|
|
priv->reg + RCAR_PCI_INT_STATUS_REG);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
static void rcar_pci_setup_errirq(struct rcar_pci_priv *priv)
|
|
{
|
|
struct device *dev = priv->dev;
|
|
int ret;
|
|
u32 val;
|
|
|
|
ret = devm_request_irq(dev, priv->irq, rcar_pci_err_irq,
|
|
IRQF_SHARED, "error irq", priv);
|
|
if (ret) {
|
|
dev_err(dev, "cannot claim IRQ for error handling\n");
|
|
return;
|
|
}
|
|
|
|
val = ioread32(priv->reg + RCAR_PCI_INT_ENABLE_REG);
|
|
val |= RCAR_PCI_INT_ALLERRORS;
|
|
iowrite32(val, priv->reg + RCAR_PCI_INT_ENABLE_REG);
|
|
}
|
|
#else
|
|
static inline void rcar_pci_setup_errirq(struct rcar_pci_priv *priv) { }
|
|
#endif
|
|
|
|
/* PCI host controller setup */
|
|
static int rcar_pci_setup(int nr, struct pci_sys_data *sys)
|
|
{
|
|
struct rcar_pci_priv *priv = sys->private_data;
|
|
struct device *dev = priv->dev;
|
|
void __iomem *reg = priv->reg;
|
|
u32 val;
|
|
int ret;
|
|
|
|
pm_runtime_enable(dev);
|
|
pm_runtime_get_sync(dev);
|
|
|
|
val = ioread32(reg + RCAR_PCI_UNIT_REV_REG);
|
|
dev_info(dev, "PCI: bus%u revision %x\n", sys->busnr, val);
|
|
|
|
/* Disable Direct Power Down State and assert reset */
|
|
val = ioread32(reg + RCAR_USBCTR_REG) & ~RCAR_USBCTR_DIRPD;
|
|
val |= RCAR_USBCTR_USBH_RST | RCAR_USBCTR_PLL_RST;
|
|
iowrite32(val, reg + RCAR_USBCTR_REG);
|
|
udelay(4);
|
|
|
|
/* De-assert reset and reset PCIAHB window1 size */
|
|
val &= ~(RCAR_USBCTR_PCIAHB_WIN1_MASK | RCAR_USBCTR_PCICLK_MASK |
|
|
RCAR_USBCTR_USBH_RST | RCAR_USBCTR_PLL_RST);
|
|
|
|
/* Setup PCIAHB window1 size */
|
|
switch (priv->window_size) {
|
|
case SZ_2G:
|
|
val |= RCAR_USBCTR_PCIAHB_WIN1_2G;
|
|
break;
|
|
case SZ_1G:
|
|
val |= RCAR_USBCTR_PCIAHB_WIN1_1G;
|
|
break;
|
|
case SZ_512M:
|
|
val |= RCAR_USBCTR_PCIAHB_WIN1_512M;
|
|
break;
|
|
default:
|
|
pr_warn("unknown window size %ld - defaulting to 256M\n",
|
|
priv->window_size);
|
|
priv->window_size = SZ_256M;
|
|
/* fall-through */
|
|
case SZ_256M:
|
|
val |= RCAR_USBCTR_PCIAHB_WIN1_256M;
|
|
break;
|
|
}
|
|
iowrite32(val, reg + RCAR_USBCTR_REG);
|
|
|
|
/* Configure AHB master and slave modes */
|
|
iowrite32(RCAR_AHB_BUS_MODE, reg + RCAR_AHB_BUS_CTR_REG);
|
|
|
|
/* Configure PCI arbiter */
|
|
val = ioread32(reg + RCAR_PCI_ARBITER_CTR_REG);
|
|
val |= RCAR_PCI_ARBITER_PCIREQ0 | RCAR_PCI_ARBITER_PCIREQ1 |
|
|
RCAR_PCI_ARBITER_PCIBP_MODE;
|
|
iowrite32(val, reg + RCAR_PCI_ARBITER_CTR_REG);
|
|
|
|
/* PCI-AHB mapping */
|
|
iowrite32(priv->window_addr | RCAR_PCIAHB_PREFETCH16,
|
|
reg + RCAR_PCIAHB_WIN1_CTR_REG);
|
|
|
|
/* AHB-PCI mapping: OHCI/EHCI registers */
|
|
val = priv->mem_res.start | RCAR_AHBPCI_WIN_CTR_MEM;
|
|
iowrite32(val, reg + RCAR_AHBPCI_WIN2_CTR_REG);
|
|
|
|
/* Enable AHB-PCI bridge PCI configuration access */
|
|
iowrite32(RCAR_AHBPCI_WIN1_HOST | RCAR_AHBPCI_WIN_CTR_CFG,
|
|
reg + RCAR_AHBPCI_WIN1_CTR_REG);
|
|
/* Set PCI-AHB Window1 address */
|
|
iowrite32(priv->window_pci | PCI_BASE_ADDRESS_MEM_PREFETCH,
|
|
reg + PCI_BASE_ADDRESS_1);
|
|
/* Set AHB-PCI bridge PCI communication area address */
|
|
val = priv->cfg_res->start + RCAR_AHBPCI_PCICOM_OFFSET;
|
|
iowrite32(val, reg + PCI_BASE_ADDRESS_0);
|
|
|
|
val = ioread32(reg + PCI_COMMAND);
|
|
val |= PCI_COMMAND_SERR | PCI_COMMAND_PARITY |
|
|
PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
|
|
iowrite32(val, reg + PCI_COMMAND);
|
|
|
|
/* Enable PCI interrupts */
|
|
iowrite32(RCAR_PCI_INT_A | RCAR_PCI_INT_B | RCAR_PCI_INT_PME,
|
|
reg + RCAR_PCI_INT_ENABLE_REG);
|
|
|
|
if (priv->irq > 0)
|
|
rcar_pci_setup_errirq(priv);
|
|
|
|
/* Add PCI resources */
|
|
pci_add_resource(&sys->resources, &priv->mem_res);
|
|
ret = devm_request_pci_bus_resources(dev, &sys->resources);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* Setup bus number based on platform device id / of bus-range */
|
|
sys->busnr = priv->busnr;
|
|
return 1;
|
|
}
|
|
|
|
static struct pci_ops rcar_pci_ops = {
|
|
.map_bus = rcar_pci_cfg_base,
|
|
.read = pci_generic_config_read,
|
|
.write = pci_generic_config_write,
|
|
};
|
|
|
|
static int pci_dma_range_parser_init(struct of_pci_range_parser *parser,
|
|
struct device_node *node)
|
|
{
|
|
const int na = 3, ns = 2;
|
|
int rlen;
|
|
|
|
parser->node = node;
|
|
parser->pna = of_n_addr_cells(node);
|
|
parser->np = parser->pna + na + ns;
|
|
|
|
parser->range = of_get_property(node, "dma-ranges", &rlen);
|
|
if (!parser->range)
|
|
return -ENOENT;
|
|
|
|
parser->end = parser->range + rlen / sizeof(__be32);
|
|
return 0;
|
|
}
|
|
|
|
static int rcar_pci_parse_map_dma_ranges(struct rcar_pci_priv *pci,
|
|
struct device_node *np)
|
|
{
|
|
struct device *dev = pci->dev;
|
|
struct of_pci_range range;
|
|
struct of_pci_range_parser parser;
|
|
int index = 0;
|
|
|
|
/* Failure to parse is ok as we fall back to defaults */
|
|
if (pci_dma_range_parser_init(&parser, np))
|
|
return 0;
|
|
|
|
/* Get the dma-ranges from DT */
|
|
for_each_of_pci_range(&parser, &range) {
|
|
/* Hardware only allows one inbound 32-bit range */
|
|
if (index)
|
|
return -EINVAL;
|
|
|
|
pci->window_addr = (unsigned long)range.cpu_addr;
|
|
pci->window_pci = (unsigned long)range.pci_addr;
|
|
pci->window_size = (unsigned long)range.size;
|
|
|
|
/* Catch HW limitations */
|
|
if (!(range.flags & IORESOURCE_PREFETCH)) {
|
|
dev_err(dev, "window must be prefetchable\n");
|
|
return -EINVAL;
|
|
}
|
|
if (pci->window_addr) {
|
|
u32 lowaddr = 1 << (ffs(pci->window_addr) - 1);
|
|
|
|
if (lowaddr < pci->window_size) {
|
|
dev_err(dev, "invalid window size/addr\n");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
index++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rcar_pci_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct resource *cfg_res, *mem_res;
|
|
struct rcar_pci_priv *priv;
|
|
void __iomem *reg;
|
|
struct hw_pci hw;
|
|
void *hw_private[1];
|
|
|
|
cfg_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
reg = devm_ioremap_resource(dev, cfg_res);
|
|
if (IS_ERR(reg))
|
|
return PTR_ERR(reg);
|
|
|
|
mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
|
if (!mem_res || !mem_res->start)
|
|
return -ENODEV;
|
|
|
|
if (mem_res->start & 0xFFFF)
|
|
return -EINVAL;
|
|
|
|
priv = devm_kzalloc(dev, sizeof(struct rcar_pci_priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
priv->mem_res = *mem_res;
|
|
priv->cfg_res = cfg_res;
|
|
|
|
priv->irq = platform_get_irq(pdev, 0);
|
|
priv->reg = reg;
|
|
priv->dev = dev;
|
|
|
|
if (priv->irq < 0) {
|
|
dev_err(dev, "no valid irq found\n");
|
|
return priv->irq;
|
|
}
|
|
|
|
/* default window addr and size if not specified in DT */
|
|
priv->window_addr = 0x40000000;
|
|
priv->window_pci = 0x40000000;
|
|
priv->window_size = SZ_1G;
|
|
|
|
if (dev->of_node) {
|
|
struct resource busnr;
|
|
int ret;
|
|
|
|
ret = of_pci_parse_bus_range(dev->of_node, &busnr);
|
|
if (ret < 0) {
|
|
dev_err(dev, "failed to parse bus-range\n");
|
|
return ret;
|
|
}
|
|
|
|
priv->busnr = busnr.start;
|
|
if (busnr.end != busnr.start)
|
|
dev_warn(dev, "only one bus number supported\n");
|
|
|
|
ret = rcar_pci_parse_map_dma_ranges(priv, dev->of_node);
|
|
if (ret < 0) {
|
|
dev_err(dev, "failed to parse dma-range\n");
|
|
return ret;
|
|
}
|
|
} else {
|
|
priv->busnr = pdev->id;
|
|
}
|
|
|
|
hw_private[0] = priv;
|
|
memset(&hw, 0, sizeof(hw));
|
|
hw.nr_controllers = ARRAY_SIZE(hw_private);
|
|
hw.io_optional = 1;
|
|
hw.private_data = hw_private;
|
|
hw.map_irq = rcar_pci_map_irq;
|
|
hw.ops = &rcar_pci_ops;
|
|
hw.setup = rcar_pci_setup;
|
|
pci_common_init_dev(dev, &hw);
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id rcar_pci_of_match[] = {
|
|
{ .compatible = "renesas,pci-r8a7790", },
|
|
{ .compatible = "renesas,pci-r8a7791", },
|
|
{ .compatible = "renesas,pci-r8a7794", },
|
|
{ .compatible = "renesas,pci-rcar-gen2", },
|
|
{ },
|
|
};
|
|
|
|
static struct platform_driver rcar_pci_driver = {
|
|
.driver = {
|
|
.name = "pci-rcar-gen2",
|
|
.suppress_bind_attrs = true,
|
|
.of_match_table = rcar_pci_of_match,
|
|
},
|
|
.probe = rcar_pci_probe,
|
|
};
|
|
builtin_platform_driver(rcar_pci_driver);
|