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/*
* PCIe host controller driver for HiSilicon SoCs
*
* Copyright (C) 2015 HiSilicon Co., Ltd. http://www.hisilicon.com
*
* Authors: Zhou Wang <wangzhou1@hisilicon.com>
* Dacai Zhu <zhudacai@hisilicon.com>
* Gabriele Paoloni <gabriele.paoloni@huawei.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/interrupt.h>
#include <linux/init.h>
#include <linux/mfd/syscon.h>
#include <linux/of_address.h>
#include <linux/of_pci.h>
#include <linux/platform_device.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
#include "pcie-designware.h"
#define PCIE_SUBCTRL_SYS_STATE4_REG 0x6818
#define PCIE_HIP06_CTRL_OFF 0x1000
#define PCIE_SYS_STATE4 (PCIE_HIP06_CTRL_OFF + 0x31c)
#define PCIE_LTSSM_LINKUP_STATE 0x11
#define PCIE_LTSSM_STATE_MASK 0x3F
#define to_hisi_pcie(x) container_of(x, struct hisi_pcie, pp)
struct hisi_pcie;
struct pcie_soc_ops {
int (*hisi_pcie_link_up)(struct hisi_pcie *hisi_pcie);
};
struct hisi_pcie {
struct pcie_port pp; /* pp.dbi_base is DT rc_dbi */
struct regmap *subctrl;
u32 port_id;
struct pcie_soc_ops *soc_ops;
};
/* HipXX PCIe host only supports 32-bit config access */
static int hisi_pcie_cfg_read(struct pcie_port *pp, int where, int size,
u32 *val)
{
u32 reg;
u32 reg_val;
void *walker = ®_val;
walker += (where & 0x3);
reg = where & ~0x3;
reg_val = dw_pcie_readl_rc(pp, reg);
if (size == 1)
*val = *(u8 __force *) walker;
else if (size == 2)
*val = *(u16 __force *) walker;
else if (size == 4)
*val = reg_val;
else
return PCIBIOS_BAD_REGISTER_NUMBER;
return PCIBIOS_SUCCESSFUL;
}
/* HipXX PCIe host only supports 32-bit config access */
static int hisi_pcie_cfg_write(struct pcie_port *pp, int where, int size,
u32 val)
{
u32 reg_val;
u32 reg;
void *walker = ®_val;
walker += (where & 0x3);
reg = where & ~0x3;
if (size == 4)
dw_pcie_writel_rc(pp, reg, val);
else if (size == 2) {
reg_val = dw_pcie_readl_rc(pp, reg);
*(u16 __force *) walker = val;
dw_pcie_writel_rc(pp, reg, reg_val);
} else if (size == 1) {
reg_val = dw_pcie_readl_rc(pp, reg);
*(u8 __force *) walker = val;
dw_pcie_writel_rc(pp, reg, reg_val);
} else
return PCIBIOS_BAD_REGISTER_NUMBER;
return PCIBIOS_SUCCESSFUL;
}
static int hisi_pcie_link_up_hip05(struct hisi_pcie *hisi_pcie)
{
u32 val;
regmap_read(hisi_pcie->subctrl, PCIE_SUBCTRL_SYS_STATE4_REG +
0x100 * hisi_pcie->port_id, &val);
return ((val & PCIE_LTSSM_STATE_MASK) == PCIE_LTSSM_LINKUP_STATE);
}
static int hisi_pcie_link_up_hip06(struct hisi_pcie *hisi_pcie)
{
struct pcie_port *pp = &hisi_pcie->pp;
u32 val;
val = dw_pcie_readl_rc(pp, PCIE_SYS_STATE4);
return ((val & PCIE_LTSSM_STATE_MASK) == PCIE_LTSSM_LINKUP_STATE);
}
static int hisi_pcie_link_up(struct pcie_port *pp)
{
struct hisi_pcie *hisi_pcie = to_hisi_pcie(pp);
return hisi_pcie->soc_ops->hisi_pcie_link_up(hisi_pcie);
}
static struct pcie_host_ops hisi_pcie_host_ops = {
.rd_own_conf = hisi_pcie_cfg_read,
.wr_own_conf = hisi_pcie_cfg_write,
.link_up = hisi_pcie_link_up,
};
static int hisi_add_pcie_port(struct hisi_pcie *hisi_pcie,
struct platform_device *pdev)
{
struct pcie_port *pp = &hisi_pcie->pp;
struct device *dev = pp->dev;
int ret;
u32 port_id;
if (of_property_read_u32(dev->of_node, "port-id", &port_id)) {
dev_err(dev, "failed to read port-id\n");
return -EINVAL;
}
if (port_id > 3) {
dev_err(dev, "Invalid port-id: %d\n", port_id);
return -EINVAL;
}
hisi_pcie->port_id = port_id;
pp->ops = &hisi_pcie_host_ops;
ret = dw_pcie_host_init(pp);
if (ret) {
dev_err(dev, "failed to initialize host\n");
return ret;
}
return 0;
}
static int hisi_pcie_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct hisi_pcie *hisi_pcie;
struct pcie_port *pp;
const struct of_device_id *match;
struct resource *reg;
struct device_driver *driver;
int ret;
hisi_pcie = devm_kzalloc(dev, sizeof(*hisi_pcie), GFP_KERNEL);
if (!hisi_pcie)
return -ENOMEM;
pp = &hisi_pcie->pp;
pp->dev = dev;
driver = dev->driver;
match = of_match_device(driver->of_match_table, dev);
hisi_pcie->soc_ops = (struct pcie_soc_ops *) match->data;
hisi_pcie->subctrl =
syscon_regmap_lookup_by_compatible("hisilicon,pcie-sas-subctrl");
if (IS_ERR(hisi_pcie->subctrl)) {
dev_err(dev, "cannot get subctrl base\n");
return PTR_ERR(hisi_pcie->subctrl);
}
reg = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rc_dbi");
pp->dbi_base = devm_ioremap_resource(dev, reg);
if (IS_ERR(pp->dbi_base)) {
dev_err(dev, "cannot get rc_dbi base\n");
return PTR_ERR(pp->dbi_base);
}
ret = hisi_add_pcie_port(hisi_pcie, pdev);
if (ret)
return ret;
dev_warn(dev, "only 32-bit config accesses supported; smaller writes may corrupt adjacent RW1C fields\n");
return 0;
}
static struct pcie_soc_ops hip05_ops = {
&hisi_pcie_link_up_hip05
};
static struct pcie_soc_ops hip06_ops = {
&hisi_pcie_link_up_hip06
};
static const struct of_device_id hisi_pcie_of_match[] = {
{
.compatible = "hisilicon,hip05-pcie",
.data = (void *) &hip05_ops,
},
{
.compatible = "hisilicon,hip06-pcie",
.data = (void *) &hip06_ops,
},
{},
};
static struct platform_driver hisi_pcie_driver = {
.probe = hisi_pcie_probe,
.driver = {
.name = "hisi-pcie",
.of_match_table = hisi_pcie_of_match,
},
};
builtin_platform_driver(hisi_pcie_driver);
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