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linux/drivers/pci/controller/dwc/pci-exynos.c
Bjorn Helgaas 49e427e6bd Merge branch 'pci/host-probe-refactor' 
- Use pci_host_bridge.windows list directly instead of splicing in a
  temporary list for cadence, mvebu, host-common (Rob Herring)

- Use pci_host_probe() instead of open-coding all the pieces for altera,
  brcmstb, iproc, mobiveil, rcar, rockchip, tegra, v3, versatile, xgene,
  xilinx, xilinx-nwl (Rob Herring)

- Convert to devm_platform_ioremap_resource_byname() instead of open-coding
  platform_get_resource_byname() and devm_ioremap_resource() for altera,
  cadence, mediatek, rockchip, tegra, xgene (Dejin Zheng)

- Convert to devm_platform_ioremap_resource() instead of open-coding
  platform_get_resource() and devm_ioremap_resource() for aardvark,
  brcmstb, exynos, ftpci100, versatile (Dejin Zheng)

- Remove redundant error messages from devm_pci_remap_cfg_resource()
  callers (Dejin Zheng)

- Drop useless PCI_ENABLE_PROC_DOMAINS from versatile driver (Rob Herring)

- Default host bridge parent device to the platform device (Rob Herring)

- Drop unnecessary zeroing of host bridge fields (Rob Herring)

- Use pci_is_root_bus() instead of tracking root bus number separately in
  aardvark, designware (imx6, keystone, designware-host), mobiveil,
  xilinx-nwl, xilinx, rockchip, rcar (Rob Herring)

- Set host bridge bus number in pci_scan_root_bus_bridge() instead of each
  driver for aardvark, designware-host, host-common, mediatek, rcar, tegra,
  v3-semi (Rob Herring)

- Use bridge resources instead of parsing DT 'ranges' again for cadence
  (Rob Herring)

- Remove private bus number and range from cadence (Rob Herring)

- Use devm_pci_alloc_host_bridge() to simplify rcar (Rob Herring)

- Use struct pci_host_bridge.windows list directly rather than a temporary
  (Rob Herring)

- Reduce OF "missing non-prefetchable window" from error to warning message
  (Rob Herring)

- Convert rcar-gen2 from old Arm-specific pci_common_init_dev() to new
  arch-independent interfaces (Rob Herring)

- Move DT resource setup into devm_pci_alloc_host_bridge() (Rob Herring)

- Set bridge map_irq and swizzle_irq to default functions; drivers that
  don't support legacy IRQs (iproc) need to undo this (Rob Herring)

* pci/host-probe-refactor:
  PCI: Set bridge map_irq and swizzle_irq to default functions
  PCI: Move DT resource setup into devm_pci_alloc_host_bridge()
  PCI: rcar-gen2: Convert to use modern host bridge probe functions
  PCI: of: Reduce missing non-prefetchable memory region to a warning
  PCI: rcar: Use struct pci_host_bridge.windows list directly
  PCI: rcar: Use devm_pci_alloc_host_bridge()
  PCI: cadence: Remove private bus number and range storage
  PCI: cadence: Use bridge resources for outbound window setup
  PCI: Move setting pci_host_bridge.busnr out of host drivers
  PCI: rcar: Use pci_is_root_bus() to check if bus is root bus
  PCI: rockchip: Use pci_is_root_bus() to check if bus is root bus
  PCI: xilinx: Use pci_is_root_bus() to check if bus is root bus
  PCI: xilinx-nwl: Use pci_is_root_bus() to check if bus is root bus
  PCI: mobiveil: Use pci_is_root_bus() to check if bus is root bus
  PCI: designware: Use pci_is_root_bus() to check if bus is root bus
  PCI: aardvark: Use pci_is_root_bus() to check if bus is root bus
  PCI: Drop unnecessary zeroing of bridge fields
  PCI: Set default bridge parent device
  PCI: versatile: Drop flag PCI_ENABLE_PROC_DOMAINS
  PCI: controller: Remove duplicate error message
  PCI: controller: Convert to devm_platform_ioremap_resource()
  PCI: controller: Convert to devm_platform_ioremap_resource_byname()
  PCI: xilinx: Use pci_host_probe() to register host
  PCI: xilinx-nwl: Use pci_host_probe() to register host
  PCI: rockchip: Use pci_host_probe() to register host
  PCI: rcar: Use pci_host_probe() to register host
  PCI: iproc: Use pci_host_probe() to register host
  PCI: altera: Use pci_host_probe() to register host
  PCI: xgene: Use pci_host_probe() to register host
  PCI: versatile: Use pci_host_probe() to register host
  PCI: v3: Use pci_host_probe() to register host
  PCI: tegra: Use pci_host_probe() to register host
  PCI: mobiveil: Use pci_host_probe() to register host
  PCI: brcmstb: Use pci_host_probe() to register host
  PCI: host-common: Use struct pci_host_bridge.windows list directly
  PCI: mvebu: Use struct pci_host_bridge.windows list directly
  PCI: cadence: Use struct pci_host_bridge.windows list directly

# Conflicts:
#	drivers/pci/controller/cadence/pcie-cadence-host.c
2020-08-05 18:24:21 -05:00

537 lines
13 KiB
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// SPDX-License-Identifier: GPL-2.0
/*
* PCIe host controller driver for Samsung Exynos SoCs
*
* Copyright (C) 2013 Samsung Electronics Co., Ltd.
* https://www.samsung.com
*
* Author: Jingoo Han <jg1.han@samsung.com>
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/phy/phy.h>
#include <linux/resource.h>
#include <linux/signal.h>
#include <linux/types.h>
#include "pcie-designware.h"
#define to_exynos_pcie(x) dev_get_drvdata((x)->dev)
/* PCIe ELBI registers */
#define PCIE_IRQ_PULSE 0x000
#define IRQ_INTA_ASSERT BIT(0)
#define IRQ_INTB_ASSERT BIT(2)
#define IRQ_INTC_ASSERT BIT(4)
#define IRQ_INTD_ASSERT BIT(6)
#define PCIE_IRQ_LEVEL 0x004
#define PCIE_IRQ_SPECIAL 0x008
#define PCIE_IRQ_EN_PULSE 0x00c
#define PCIE_IRQ_EN_LEVEL 0x010
#define IRQ_MSI_ENABLE BIT(2)
#define PCIE_IRQ_EN_SPECIAL 0x014
#define PCIE_PWR_RESET 0x018
#define PCIE_CORE_RESET 0x01c
#define PCIE_CORE_RESET_ENABLE BIT(0)
#define PCIE_STICKY_RESET 0x020
#define PCIE_NONSTICKY_RESET 0x024
#define PCIE_APP_INIT_RESET 0x028
#define PCIE_APP_LTSSM_ENABLE 0x02c
#define PCIE_ELBI_RDLH_LINKUP 0x064
#define PCIE_ELBI_LTSSM_ENABLE 0x1
#define PCIE_ELBI_SLV_AWMISC 0x11c
#define PCIE_ELBI_SLV_ARMISC 0x120
#define PCIE_ELBI_SLV_DBI_ENABLE BIT(21)
struct exynos_pcie_mem_res {
void __iomem *elbi_base; /* DT 0th resource: PCIe CTRL */
};
struct exynos_pcie_clk_res {
struct clk *clk;
struct clk *bus_clk;
};
struct exynos_pcie {
struct dw_pcie *pci;
struct exynos_pcie_mem_res *mem_res;
struct exynos_pcie_clk_res *clk_res;
const struct exynos_pcie_ops *ops;
int reset_gpio;
struct phy *phy;
};
struct exynos_pcie_ops {
int (*get_mem_resources)(struct platform_device *pdev,
struct exynos_pcie *ep);
int (*get_clk_resources)(struct exynos_pcie *ep);
int (*init_clk_resources)(struct exynos_pcie *ep);
void (*deinit_clk_resources)(struct exynos_pcie *ep);
};
static int exynos5440_pcie_get_mem_resources(struct platform_device *pdev,
struct exynos_pcie *ep)
{
struct dw_pcie *pci = ep->pci;
struct device *dev = pci->dev;
ep->mem_res = devm_kzalloc(dev, sizeof(*ep->mem_res), GFP_KERNEL);
if (!ep->mem_res)
return -ENOMEM;
ep->mem_res->elbi_base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(ep->mem_res->elbi_base))
return PTR_ERR(ep->mem_res->elbi_base);
return 0;
}
static int exynos5440_pcie_get_clk_resources(struct exynos_pcie *ep)
{
struct dw_pcie *pci = ep->pci;
struct device *dev = pci->dev;
ep->clk_res = devm_kzalloc(dev, sizeof(*ep->clk_res), GFP_KERNEL);
if (!ep->clk_res)
return -ENOMEM;
ep->clk_res->clk = devm_clk_get(dev, "pcie");
if (IS_ERR(ep->clk_res->clk)) {
dev_err(dev, "Failed to get pcie rc clock\n");
return PTR_ERR(ep->clk_res->clk);
}
ep->clk_res->bus_clk = devm_clk_get(dev, "pcie_bus");
if (IS_ERR(ep->clk_res->bus_clk)) {
dev_err(dev, "Failed to get pcie bus clock\n");
return PTR_ERR(ep->clk_res->bus_clk);
}
return 0;
}
static int exynos5440_pcie_init_clk_resources(struct exynos_pcie *ep)
{
struct dw_pcie *pci = ep->pci;
struct device *dev = pci->dev;
int ret;
ret = clk_prepare_enable(ep->clk_res->clk);
if (ret) {
dev_err(dev, "cannot enable pcie rc clock");
return ret;
}
ret = clk_prepare_enable(ep->clk_res->bus_clk);
if (ret) {
dev_err(dev, "cannot enable pcie bus clock");
goto err_bus_clk;
}
return 0;
err_bus_clk:
clk_disable_unprepare(ep->clk_res->clk);
return ret;
}
static void exynos5440_pcie_deinit_clk_resources(struct exynos_pcie *ep)
{
clk_disable_unprepare(ep->clk_res->bus_clk);
clk_disable_unprepare(ep->clk_res->clk);
}
static const struct exynos_pcie_ops exynos5440_pcie_ops = {
.get_mem_resources = exynos5440_pcie_get_mem_resources,
.get_clk_resources = exynos5440_pcie_get_clk_resources,
.init_clk_resources = exynos5440_pcie_init_clk_resources,
.deinit_clk_resources = exynos5440_pcie_deinit_clk_resources,
};
static void exynos_pcie_writel(void __iomem *base, u32 val, u32 reg)
{
writel(val, base + reg);
}
static u32 exynos_pcie_readl(void __iomem *base, u32 reg)
{
return readl(base + reg);
}
static void exynos_pcie_sideband_dbi_w_mode(struct exynos_pcie *ep, bool on)
{
u32 val;
val = exynos_pcie_readl(ep->mem_res->elbi_base, PCIE_ELBI_SLV_AWMISC);
if (on)
val |= PCIE_ELBI_SLV_DBI_ENABLE;
else
val &= ~PCIE_ELBI_SLV_DBI_ENABLE;
exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_ELBI_SLV_AWMISC);
}
static void exynos_pcie_sideband_dbi_r_mode(struct exynos_pcie *ep, bool on)
{
u32 val;
val = exynos_pcie_readl(ep->mem_res->elbi_base, PCIE_ELBI_SLV_ARMISC);
if (on)
val |= PCIE_ELBI_SLV_DBI_ENABLE;
else
val &= ~PCIE_ELBI_SLV_DBI_ENABLE;
exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_ELBI_SLV_ARMISC);
}
static void exynos_pcie_assert_core_reset(struct exynos_pcie *ep)
{
u32 val;
val = exynos_pcie_readl(ep->mem_res->elbi_base, PCIE_CORE_RESET);
val &= ~PCIE_CORE_RESET_ENABLE;
exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_CORE_RESET);
exynos_pcie_writel(ep->mem_res->elbi_base, 0, PCIE_PWR_RESET);
exynos_pcie_writel(ep->mem_res->elbi_base, 0, PCIE_STICKY_RESET);
exynos_pcie_writel(ep->mem_res->elbi_base, 0, PCIE_NONSTICKY_RESET);
}
static void exynos_pcie_deassert_core_reset(struct exynos_pcie *ep)
{
u32 val;
val = exynos_pcie_readl(ep->mem_res->elbi_base, PCIE_CORE_RESET);
val |= PCIE_CORE_RESET_ENABLE;
exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_CORE_RESET);
exynos_pcie_writel(ep->mem_res->elbi_base, 1, PCIE_STICKY_RESET);
exynos_pcie_writel(ep->mem_res->elbi_base, 1, PCIE_NONSTICKY_RESET);
exynos_pcie_writel(ep->mem_res->elbi_base, 1, PCIE_APP_INIT_RESET);
exynos_pcie_writel(ep->mem_res->elbi_base, 0, PCIE_APP_INIT_RESET);
}
static void exynos_pcie_assert_reset(struct exynos_pcie *ep)
{
struct dw_pcie *pci = ep->pci;
struct device *dev = pci->dev;
if (ep->reset_gpio >= 0)
devm_gpio_request_one(dev, ep->reset_gpio,
GPIOF_OUT_INIT_HIGH, "RESET");
}
static int exynos_pcie_establish_link(struct exynos_pcie *ep)
{
struct dw_pcie *pci = ep->pci;
struct pcie_port *pp = &pci->pp;
struct device *dev = pci->dev;
if (dw_pcie_link_up(pci)) {
dev_err(dev, "Link already up\n");
return 0;
}
exynos_pcie_assert_core_reset(ep);
phy_reset(ep->phy);
exynos_pcie_writel(ep->mem_res->elbi_base, 1,
PCIE_PWR_RESET);
phy_power_on(ep->phy);
phy_init(ep->phy);
exynos_pcie_deassert_core_reset(ep);
dw_pcie_setup_rc(pp);
exynos_pcie_assert_reset(ep);
/* assert LTSSM enable */
exynos_pcie_writel(ep->mem_res->elbi_base, PCIE_ELBI_LTSSM_ENABLE,
PCIE_APP_LTSSM_ENABLE);
/* check if the link is up or not */
if (!dw_pcie_wait_for_link(pci))
return 0;
phy_power_off(ep->phy);
return -ETIMEDOUT;
}
static void exynos_pcie_clear_irq_pulse(struct exynos_pcie *ep)
{
u32 val;
val = exynos_pcie_readl(ep->mem_res->elbi_base, PCIE_IRQ_PULSE);
exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_IRQ_PULSE);
}
static void exynos_pcie_enable_irq_pulse(struct exynos_pcie *ep)
{
u32 val;
/* enable INTX interrupt */
val = IRQ_INTA_ASSERT | IRQ_INTB_ASSERT |
IRQ_INTC_ASSERT | IRQ_INTD_ASSERT;
exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_IRQ_EN_PULSE);
}
static irqreturn_t exynos_pcie_irq_handler(int irq, void *arg)
{
struct exynos_pcie *ep = arg;
exynos_pcie_clear_irq_pulse(ep);
return IRQ_HANDLED;
}
static void exynos_pcie_msi_init(struct exynos_pcie *ep)
{
struct dw_pcie *pci = ep->pci;
struct pcie_port *pp = &pci->pp;
u32 val;
dw_pcie_msi_init(pp);
/* enable MSI interrupt */
val = exynos_pcie_readl(ep->mem_res->elbi_base, PCIE_IRQ_EN_LEVEL);
val |= IRQ_MSI_ENABLE;
exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_IRQ_EN_LEVEL);
}
static void exynos_pcie_enable_interrupts(struct exynos_pcie *ep)
{
exynos_pcie_enable_irq_pulse(ep);
if (IS_ENABLED(CONFIG_PCI_MSI))
exynos_pcie_msi_init(ep);
}
static u32 exynos_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base,
u32 reg, size_t size)
{
struct exynos_pcie *ep = to_exynos_pcie(pci);
u32 val;
exynos_pcie_sideband_dbi_r_mode(ep, true);
dw_pcie_read(base + reg, size, &val);
exynos_pcie_sideband_dbi_r_mode(ep, false);
return val;
}
static void exynos_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base,
u32 reg, size_t size, u32 val)
{
struct exynos_pcie *ep = to_exynos_pcie(pci);
exynos_pcie_sideband_dbi_w_mode(ep, true);
dw_pcie_write(base + reg, size, val);
exynos_pcie_sideband_dbi_w_mode(ep, false);
}
static int exynos_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
u32 *val)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct exynos_pcie *ep = to_exynos_pcie(pci);
int ret;
exynos_pcie_sideband_dbi_r_mode(ep, true);
ret = dw_pcie_read(pci->dbi_base + where, size, val);
exynos_pcie_sideband_dbi_r_mode(ep, false);
return ret;
}
static int exynos_pcie_wr_own_conf(struct pcie_port *pp, int where, int size,
u32 val)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct exynos_pcie *ep = to_exynos_pcie(pci);
int ret;
exynos_pcie_sideband_dbi_w_mode(ep, true);
ret = dw_pcie_write(pci->dbi_base + where, size, val);
exynos_pcie_sideband_dbi_w_mode(ep, false);
return ret;
}
static int exynos_pcie_link_up(struct dw_pcie *pci)
{
struct exynos_pcie *ep = to_exynos_pcie(pci);
u32 val;
val = exynos_pcie_readl(ep->mem_res->elbi_base, PCIE_ELBI_RDLH_LINKUP);
if (val == PCIE_ELBI_LTSSM_ENABLE)
return 1;
return 0;
}
static int exynos_pcie_host_init(struct pcie_port *pp)
{
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
struct exynos_pcie *ep = to_exynos_pcie(pci);
exynos_pcie_establish_link(ep);
exynos_pcie_enable_interrupts(ep);
return 0;
}
static const struct dw_pcie_host_ops exynos_pcie_host_ops = {
.rd_own_conf = exynos_pcie_rd_own_conf,
.wr_own_conf = exynos_pcie_wr_own_conf,
.host_init = exynos_pcie_host_init,
};
static int __init exynos_add_pcie_port(struct exynos_pcie *ep,
struct platform_device *pdev)
{
struct dw_pcie *pci = ep->pci;
struct pcie_port *pp = &pci->pp;
struct device *dev = &pdev->dev;
int ret;
pp->irq = platform_get_irq(pdev, 1);
if (pp->irq < 0) {
dev_err(dev, "failed to get irq\n");
return pp->irq;
}
ret = devm_request_irq(dev, pp->irq, exynos_pcie_irq_handler,
IRQF_SHARED, "exynos-pcie", ep);
if (ret) {
dev_err(dev, "failed to request irq\n");
return ret;
}
if (IS_ENABLED(CONFIG_PCI_MSI)) {
pp->msi_irq = platform_get_irq(pdev, 0);
if (pp->msi_irq < 0) {
dev_err(dev, "failed to get msi irq\n");
return pp->msi_irq;
}
}
pp->ops = &exynos_pcie_host_ops;
ret = dw_pcie_host_init(pp);
if (ret) {
dev_err(dev, "failed to initialize host\n");
return ret;
}
return 0;
}
static const struct dw_pcie_ops dw_pcie_ops = {
.read_dbi = exynos_pcie_read_dbi,
.write_dbi = exynos_pcie_write_dbi,
.link_up = exynos_pcie_link_up,
};
static int __init exynos_pcie_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct dw_pcie *pci;
struct exynos_pcie *ep;
struct device_node *np = dev->of_node;
int ret;
ep = devm_kzalloc(dev, sizeof(*ep), GFP_KERNEL);
if (!ep)
return -ENOMEM;
pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
if (!pci)
return -ENOMEM;
pci->dev = dev;
pci->ops = &dw_pcie_ops;
ep->pci = pci;
ep->ops = (const struct exynos_pcie_ops *)
of_device_get_match_data(dev);
ep->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0);
ep->phy = devm_of_phy_get(dev, np, NULL);
if (IS_ERR(ep->phy)) {
if (PTR_ERR(ep->phy) != -ENODEV)
return PTR_ERR(ep->phy);
ep->phy = NULL;
}
if (ep->ops && ep->ops->get_mem_resources) {
ret = ep->ops->get_mem_resources(pdev, ep);
if (ret)
return ret;
}
if (ep->ops && ep->ops->get_clk_resources &&
ep->ops->init_clk_resources) {
ret = ep->ops->get_clk_resources(ep);
if (ret)
return ret;
ret = ep->ops->init_clk_resources(ep);
if (ret)
return ret;
}
platform_set_drvdata(pdev, ep);
ret = exynos_add_pcie_port(ep, pdev);
if (ret < 0)
goto fail_probe;
return 0;
fail_probe:
phy_exit(ep->phy);
if (ep->ops && ep->ops->deinit_clk_resources)
ep->ops->deinit_clk_resources(ep);
return ret;
}
static int __exit exynos_pcie_remove(struct platform_device *pdev)
{
struct exynos_pcie *ep = platform_get_drvdata(pdev);
if (ep->ops && ep->ops->deinit_clk_resources)
ep->ops->deinit_clk_resources(ep);
return 0;
}
static const struct of_device_id exynos_pcie_of_match[] = {
{
.compatible = "samsung,exynos5440-pcie",
.data = &exynos5440_pcie_ops
},
{},
};
static struct platform_driver exynos_pcie_driver = {
.remove = __exit_p(exynos_pcie_remove),
.driver = {
.name = "exynos-pcie",
.of_match_table = exynos_pcie_of_match,
},
};
/* Exynos PCIe driver does not allow module unload */
static int __init exynos_pcie_init(void)
{
return platform_driver_probe(&exynos_pcie_driver, exynos_pcie_probe);
}
subsys_initcall(exynos_pcie_init);
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