[RFC 2/2] pci: dwc: pci-exynos: add the codes to support the exynos5433
From: Jaehoon Chung
Date: Thu Dec 21 2017 - 07:15:11 EST
Exynos5433 has the PCIe for WiFi.
Added the codes relevant to PCIe for supporting the exynos5433.
Also changed the binding documentation name to
'samsung,exynos-pcie.txt'.
(It's not only exynos5440 anymore.)
Signed-off-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
---
...exynos5440-pcie.txt => samsung,exynos-pcie.txt} | 2 +-
drivers/pci/dwc/pci-exynos.c | 183 ++++++++++++++++-----
2 files changed, 144 insertions(+), 41 deletions(-)
rename Documentation/devicetree/bindings/pci/{samsung,exynos5440-pcie.txt => samsung,exynos-pcie.txt} (97%)
diff --git a/Documentation/devicetree/bindings/pci/samsung,exynos5440-pcie.txt b/Documentation/devicetree/bindings/pci/samsung,exynos-pcie.txt
similarity index 97%
rename from Documentation/devicetree/bindings/pci/samsung,exynos5440-pcie.txt
rename to Documentation/devicetree/bindings/pci/samsung,exynos-pcie.txt
index 34a11bfbfb60..958dcc150505 100644
--- a/Documentation/devicetree/bindings/pci/samsung,exynos5440-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/samsung,exynos-pcie.txt
@@ -4,7 +4,7 @@ This PCIe host controller is based on the Synopsys DesignWare PCIe IP
and thus inherits all the common properties defined in designware-pcie.txt.
Required properties:
-- compatible: "samsung,exynos5440-pcie"
+- compatible: "samsung,exynos5440-pcie" or "samsung,exynos5433-pcie"
- reg: base addresses and lengths of the PCIe controller,
the PHY controller, additional register for the PHY controller.
(Registers for the PHY controller are DEPRECATED.
diff --git a/drivers/pci/dwc/pci-exynos.c b/drivers/pci/dwc/pci-exynos.c
index 5596fdedbb94..8dee2e90347e 100644
--- a/drivers/pci/dwc/pci-exynos.c
+++ b/drivers/pci/dwc/pci-exynos.c
@@ -40,6 +40,8 @@
#define PCIE_IRQ_SPECIAL 0x008
#define PCIE_IRQ_EN_PULSE 0x00c
#define PCIE_IRQ_EN_LEVEL 0x010
+#define PCIE_SW_WAKE 0x018
+#define PCIE_BUS_EN BIT(1)
#define IRQ_MSI_ENABLE BIT(2)
#define PCIE_IRQ_EN_SPECIAL 0x014
#define PCIE_PWR_RESET 0x018
@@ -49,7 +51,8 @@
#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_RDLH_LINKUP 0x074
+#define PCIE_ELBI_XMLH_LINKUP BIT(4)
#define PCIE_ELBI_LTSSM_ENABLE 0x1
#define PCIE_ELBI_SLV_AWMISC 0x11c
#define PCIE_ELBI_SLV_ARMISC 0x120
@@ -94,6 +97,10 @@
#define PCIE_PHY_TRSV3_PD_TSV BIT(7)
#define PCIE_PHY_TRSV3_LVCC 0x31c
+/* DBI register */
+#define PCIE_MISC_CONTROL_1_OFF 0x8BC
+#define DBI_RO_WR_EN BIT(0)
+
struct exynos_pcie_mem_res {
void __iomem *elbi_base; /* DT 0th resource: PCIe CTRL */
void __iomem *phy_base; /* DT 1st resource: PHY CTRL */
@@ -221,6 +228,96 @@ static const struct exynos_pcie_ops exynos5440_pcie_ops = {
.deinit_clk_resources = exynos5440_pcie_deinit_clk_resources,
};
+static int exynos5433_pcie_get_mem_resources(struct platform_device *pdev,
+ struct exynos_pcie *ep)
+{
+ struct dw_pcie *pci = ep->pci;
+ struct device *dev = pci->dev;
+ struct resource *res;
+
+ ep->mem_res = devm_kzalloc(dev, sizeof(*ep->mem_res), GFP_KERNEL);
+ if (!ep->mem_res)
+ return -ENOMEM;
+
+ /* External Local Bus interface(ELBI) Register */
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "elbi");
+ ep->mem_res->elbi_base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(ep->mem_res->elbi_base))
+ return PTR_ERR(ep->mem_res->elbi_base);
+
+ /* Data Bus Interface(DBI) Register */
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
+ pci->dbi_base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(pci->dbi_base))
+ return PTR_ERR(pci->dbi_base);
+
+ return 0;
+}
+
+static int exynos5433_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 void exynos5433_pcie_deinit_clk_resources(struct exynos_pcie *ep)
+{
+ clk_disable_unprepare(ep->clk_res->bus_clk);
+ clk_disable_unprepare(ep->clk_res->clk);
+}
+
+
+static int exynos5433_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 const struct exynos_pcie_ops exynos5433_pcie_ops = {
+ .get_mem_resources = exynos5433_pcie_get_mem_resources,
+ .get_clk_resources = exynos5433_pcie_get_clk_resources,
+ .init_clk_resources = exynos5433_pcie_init_clk_resources,
+ .deinit_clk_resources = exynos5433_pcie_deinit_clk_resources,
+};
+
static void exynos_pcie_writel(void __iomem *base, u32 val, u32 reg)
{
writel(val, base + reg);
@@ -279,7 +376,9 @@ static void exynos_pcie_deassert_core_reset(struct exynos_pcie *ep)
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);
- exynos_pcie_writel(ep->mem_res->block_base, 1, PCIE_PHY_MAC_RESET);
+ if (ep->mem_res->block_base)
+ exynos_pcie_writel(ep->mem_res->block_base, 1,
+ PCIE_PHY_MAC_RESET);
}
static void exynos_pcie_assert_phy_reset(struct exynos_pcie *ep)
@@ -413,9 +512,6 @@ static int exynos_pcie_establish_link(struct exynos_pcie *ep)
if (ep->using_phy) {
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);
} else {
@@ -430,14 +526,16 @@ static int exynos_pcie_establish_link(struct exynos_pcie *ep)
udelay(500);
exynos_pcie_writel(ep->mem_res->block_base, 0,
PCIE_PHY_COMMON_RESET);
+ exynos_pcie_deassert_core_reset(ep);
}
- /* pulse for common reset */
- exynos_pcie_writel(ep->mem_res->block_base, 1, PCIE_PHY_COMMON_RESET);
- udelay(500);
- exynos_pcie_writel(ep->mem_res->block_base, 0, PCIE_PHY_COMMON_RESET);
+ /*
+ * Enable DBI_RO_WR_EN bit.
+ * - When set to 1, some RO and HWinit bits are wriatble from
+ * the local application through the DBI.
+ */
+ dw_pcie_writel_dbi(pci, PCIE_MISC_CONTROL_1_OFF, DBI_RO_WR_EN);
- exynos_pcie_deassert_core_reset(ep);
dw_pcie_setup_rc(pp);
exynos_pcie_assert_reset(ep);
@@ -472,16 +570,6 @@ static void exynos_pcie_clear_irq_pulse(struct exynos_pcie *ep)
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;
@@ -513,9 +601,16 @@ static void exynos_pcie_msi_init(struct exynos_pcie *ep)
exynos_pcie_writel(ep->mem_res->elbi_base, val, PCIE_IRQ_EN_LEVEL);
}
-static void exynos_pcie_enable_interrupts(struct exynos_pcie *ep)
+static void exynos_pcie_enable_irq_pulse(struct exynos_pcie *ep)
{
- exynos_pcie_enable_irq_pulse(ep);
+ u32 val;
+
+ 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);
+
+ exynos_pcie_writel(ep->mem_res->elbi_base, 0, PCIE_IRQ_EN_LEVEL);
+ exynos_pcie_writel(ep->mem_res->elbi_base, 0, PCIE_IRQ_EN_SPECIAL);
if (IS_ENABLED(CONFIG_PCI_MSI))
exynos_pcie_msi_init(ep);
@@ -575,10 +670,8 @@ static int exynos_pcie_link_up(struct dw_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;
+ return (val & PCIE_ELBI_XMLH_LINKUP);
}
static int exynos_pcie_host_init(struct pcie_port *pp)
@@ -587,7 +680,7 @@ static int exynos_pcie_host_init(struct pcie_port *pp)
struct exynos_pcie *ep = to_exynos_pcie(pci);
exynos_pcie_establish_link(ep);
- exynos_pcie_enable_interrupts(ep);
+ exynos_pcie_enable_irq_pulse(ep);
return 0;
}
@@ -608,8 +701,11 @@ static int __init exynos_add_pcie_port(struct exynos_pcie *ep,
pp->irq = platform_get_irq(pdev, 1);
if (pp->irq < 0) {
- dev_err(dev, "failed to get irq\n");
- return pp->irq;
+ pp->irq = platform_get_irq_byname(pdev, "intr");
+ 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);
@@ -678,13 +774,23 @@ static int __init exynos_pcie_probe(struct platform_device *pdev)
ep->reset_gpio = of_get_named_gpio(np, "reset-gpio", 0);
- /* Assume that controller doesn't use the PHY framework */
- ep->using_phy = false;
+ /*
+ * In case of Exynos5440,
+ * Assume that controller doesn't use the PHY frameork.
+ * Other SoCs might be used the PHY framework.
+ */
+
+ if (of_device_is_compatible(np, "samsung,exynos5440-pcie"))
+ ep->using_phy = false;
- ep->phy = devm_of_phy_get(dev, np, NULL);
+ ep->phy = devm_of_phy_get(dev, np, "pcie-phy");
if (IS_ERR(ep->phy)) {
if (PTR_ERR(ep->phy) == -EPROBE_DEFER)
return PTR_ERR(ep->phy);
+ if (!of_device_is_compatible(np, "samsung,exynos5440-pcie")) {
+ dev_err(dev, "Can't find the pcie-phy\n");
+ return PTR_ERR(ep->phy);
+ }
dev_warn(dev, "Use the 'phy' property. Current DT of pci-exynos was deprecated!!\n");
} else
ep->using_phy = true;
@@ -734,23 +840,20 @@ static int __exit exynos_pcie_remove(struct platform_device *pdev)
static const struct of_device_id exynos_pcie_of_match[] = {
{
.compatible = "samsung,exynos5440-pcie",
- .data = &exynos5440_pcie_ops
+ .data = &exynos5440_pcie_ops,
+ }, {
+ .compatible = "samsung,exynos5433-pcie",
+ .data = &exynos5433_pcie_ops,
},
{},
};
static struct platform_driver exynos_pcie_driver = {
+ .probe = exynos_pcie_probe,
.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);
+builtin_platform_driver(exynos_pcie_driver);
--
2.15.1