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linux-sg2042/drivers/pci/host/pci-rcar-gen2.c

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/*
* pci-rcar-gen2: internal PCI bus support
*
* Copyright (C) 2013 Renesas Solutions Corp.
* Copyright (C) 2013 Cogent Embedded, Inc.
*
* 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/module.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.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_A (1 << 16)
#define RCAR_PCI_INT_B (1 << 17)
#define RCAR_PCI_INT_PME (1 << 19)
#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)
/* Number of internal PCI controllers */
#define RCAR_PCI_NR_CONTROLLERS 3
struct rcar_pci_priv {
struct device *dev;
void __iomem *reg;
struct resource io_res;
struct resource mem_res;
struct resource *cfg_res;
int irq;
};
/* 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;
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;
}
static int rcar_pci_read_config(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 *val)
{
void __iomem *reg = rcar_pci_cfg_base(bus, devfn, where);
if (!reg)
return PCIBIOS_DEVICE_NOT_FOUND;
switch (size) {
case 1:
*val = ioread8(reg);
break;
case 2:
*val = ioread16(reg);
break;
default:
*val = ioread32(reg);
break;
}
return PCIBIOS_SUCCESSFUL;
}
static int rcar_pci_write_config(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 val)
{
void __iomem *reg = rcar_pci_cfg_base(bus, devfn, where);
if (!reg)
return PCIBIOS_DEVICE_NOT_FOUND;
switch (size) {
case 1:
iowrite8(val, reg);
break;
case 2:
iowrite16(val, reg);
break;
default:
iowrite32(val, reg);
break;
}
return PCIBIOS_SUCCESSFUL;
}
/* PCI interrupt mapping */
static int __init 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;
return priv->irq;
}
/* PCI host controller setup */
static int __init rcar_pci_setup(int nr, struct pci_sys_data *sys)
{
struct rcar_pci_priv *priv = sys->private_data;
void __iomem *reg = priv->reg;
u32 val;
pm_runtime_enable(priv->dev);
pm_runtime_get_sync(priv->dev);
val = ioread32(reg + RCAR_PCI_UNIT_REV_REG);
dev_info(priv->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 set PCIAHB window1 size to 1GB */
val &= ~(RCAR_USBCTR_PCIAHB_WIN1_MASK | RCAR_USBCTR_PCICLK_MASK |
RCAR_USBCTR_USBH_RST | RCAR_USBCTR_PLL_RST);
iowrite32(val | RCAR_USBCTR_PCIAHB_WIN1_1G, 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: 0x40000000-0x80000000 */
iowrite32(0x40000000 | 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(0x40000000 | 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);
/* Add PCI resources */
pci_add_resource(&sys->resources, &priv->io_res);
pci_add_resource(&sys->resources, &priv->mem_res);
return 1;
}
static struct pci_ops rcar_pci_ops = {
.read = rcar_pci_read_config,
.write = rcar_pci_write_config,
};
static struct hw_pci rcar_hw_pci __initdata = {
.map_irq = rcar_pci_map_irq,
.ops = &rcar_pci_ops,
.setup = rcar_pci_setup,
};
static int rcar_pci_count __initdata;
static int __init rcar_pci_add_controller(struct rcar_pci_priv *priv)
{
void **private_data;
int count;
if (rcar_hw_pci.nr_controllers < rcar_pci_count)
goto add_priv;
/* (Re)allocate private data pointer array if needed */
count = rcar_pci_count + RCAR_PCI_NR_CONTROLLERS;
private_data = kzalloc(count * sizeof(void *), GFP_KERNEL);
if (!private_data)
return -ENOMEM;
rcar_pci_count = count;
if (rcar_hw_pci.private_data) {
memcpy(private_data, rcar_hw_pci.private_data,
rcar_hw_pci.nr_controllers * sizeof(void *));
kfree(rcar_hw_pci.private_data);
}
rcar_hw_pci.private_data = private_data;
add_priv:
/* Add private data pointer to the array */
rcar_hw_pci.private_data[rcar_hw_pci.nr_controllers++] = priv;
return 0;
}
static int __init rcar_pci_probe(struct platform_device *pdev)
{
struct resource *cfg_res, *mem_res;
struct rcar_pci_priv *priv;
void __iomem *reg;
cfg_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
reg = devm_ioremap_resource(&pdev->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;
priv = devm_kzalloc(&pdev->dev,
sizeof(struct rcar_pci_priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->mem_res = *mem_res;
/*
* The controller does not support/use port I/O,
* so setup a dummy port I/O region here.
*/
priv->io_res.start = priv->mem_res.start;
priv->io_res.end = priv->mem_res.end;
priv->io_res.flags = IORESOURCE_IO;
priv->cfg_res = cfg_res;
priv->irq = platform_get_irq(pdev, 0);
priv->reg = reg;
priv->dev = &pdev->dev;
return rcar_pci_add_controller(priv);
}
static struct platform_driver rcar_pci_driver = {
.driver = {
.name = "pci-rcar-gen2",
},
};
static int __init rcar_pci_init(void)
{
int retval;
retval = platform_driver_probe(&rcar_pci_driver, rcar_pci_probe);
if (!retval)
pci_common_init(&rcar_hw_pci);
/* Private data pointer array is not needed any more */
kfree(rcar_hw_pci.private_data);
rcar_hw_pci.private_data = NULL;
return retval;
}
subsys_initcall(rcar_pci_init);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Renesas R-Car Gen2 internal PCI");
MODULE_AUTHOR("Valentine Barshak <valentine.barshak@cogentembedded.com>");
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