[PATCH v2 2/3] PCI: uniphier-ep: Add support for non-legacy SoC
Kunihiko Hayashi
hayashi.kunihiko at socionext.com
Thu Feb 3 20:25:38 PST 2022
Define SoC data that includes pci_epc_features and boolean 'is_legacy'
to distinguish between legacy SoC (ex. Pro5) and non-legacy SoC.
Rename uniphier_pcie_init_ep() to uniphier_pcie_init_ep_legacy() for
initializing PCIe controller implemented in legacy SoC, add new
uniphier_pcie_init_ep() and uniphier_pcie_wait_ep() for non-legacy SoC
in the same method as pcie-uniphier driver.
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko at socionext.com>
---
drivers/pci/controller/dwc/pcie-uniphier-ep.c | 124 ++++++++++++++++++++++----
1 file changed, 106 insertions(+), 18 deletions(-)
diff --git a/drivers/pci/controller/dwc/pcie-uniphier-ep.c b/drivers/pci/controller/dwc/pcie-uniphier-ep.c
index 69810c6b0d58..073bdf7fcee3 100644
--- a/drivers/pci/controller/dwc/pcie-uniphier-ep.c
+++ b/drivers/pci/controller/dwc/pcie-uniphier-ep.c
@@ -10,6 +10,7 @@
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/init.h>
+#include <linux/iopoll.h>
#include <linux/of_device.h>
#include <linux/pci.h>
#include <linux/phy/phy.h>
@@ -31,6 +32,17 @@
#define PCL_RSTCTRL2 0x0024
#define PCL_RSTCTRL_PHY_RESET BIT(0)
+#define PCL_PINCTRL0 0x002c
+#define PCL_PERST_PLDN_REGEN BIT(12)
+#define PCL_PERST_NOE_REGEN BIT(11)
+#define PCL_PERST_OUT_REGEN BIT(8)
+#define PCL_PERST_PLDN_REGVAL BIT(4)
+#define PCL_PERST_NOE_REGVAL BIT(3)
+#define PCL_PERST_OUT_REGVAL BIT(0)
+
+#define PCL_PIPEMON 0x0044
+#define PCL_PCLK_ALIVE BIT(15)
+
#define PCL_MODE 0x8000
#define PCL_MODE_REGEN BIT(8)
#define PCL_MODE_REGVAL BIT(0)
@@ -51,6 +63,9 @@
#define PCL_APP_INTX 0x8074
#define PCL_APP_INTX_SYS_INT BIT(0)
+#define PCL_APP_PM0 0x8078
+#define PCL_SYS_AUX_PWR_DET BIT(8)
+
/* assertion time of INTx in usec */
#define PCL_INTX_WIDTH_USEC 30
@@ -60,7 +75,12 @@ struct uniphier_pcie_ep_priv {
struct clk *clk, *clk_gio;
struct reset_control *rst, *rst_gio;
struct phy *phy;
- const struct pci_epc_features *features;
+ const struct uniphier_pcie_ep_soc_data *data;
+};
+
+struct uniphier_pcie_ep_soc_data {
+ bool is_legacy;
+ const struct pci_epc_features features;
};
#define to_uniphier_pcie(x) dev_get_drvdata((x)->dev)
@@ -91,7 +111,7 @@ static void uniphier_pcie_phy_reset(struct uniphier_pcie_ep_priv *priv,
writel(val, priv->base + PCL_RSTCTRL2);
}
-static void uniphier_pcie_init_ep(struct uniphier_pcie_ep_priv *priv)
+static void uniphier_pcie_init_ep_legacy(struct uniphier_pcie_ep_priv *priv)
{
u32 val;
@@ -116,6 +136,63 @@ static void uniphier_pcie_init_ep(struct uniphier_pcie_ep_priv *priv)
msleep(100);
}
+static void uniphier_pcie_init_ep(struct uniphier_pcie_ep_priv *priv)
+{
+ u32 val;
+
+ if (priv->data->is_legacy) {
+ uniphier_pcie_init_ep_legacy(priv);
+ return;
+ }
+
+ /* set EP mode */
+ val = readl(priv->base + PCL_MODE);
+ val |= PCL_MODE_REGEN | PCL_MODE_REGVAL;
+ writel(val, priv->base + PCL_MODE);
+
+ /* use auxiliary power detection */
+ val = readl(priv->base + PCL_APP_PM0);
+ val |= PCL_SYS_AUX_PWR_DET;
+ writel(val, priv->base + PCL_APP_PM0);
+
+ /* assert PERST# */
+ val = readl(priv->base + PCL_PINCTRL0);
+ val &= ~(PCL_PERST_NOE_REGVAL | PCL_PERST_OUT_REGVAL
+ | PCL_PERST_PLDN_REGVAL);
+ val |= PCL_PERST_NOE_REGEN | PCL_PERST_OUT_REGEN
+ | PCL_PERST_PLDN_REGEN;
+ writel(val, priv->base + PCL_PINCTRL0);
+
+ uniphier_pcie_ltssm_enable(priv, false);
+
+ usleep_range(100000, 200000);
+
+ /* deassert PERST# */
+ val = readl(priv->base + PCL_PINCTRL0);
+ val |= PCL_PERST_OUT_REGVAL | PCL_PERST_OUT_REGEN;
+ writel(val, priv->base + PCL_PINCTRL0);
+}
+
+static int uniphier_pcie_wait_ep(struct uniphier_pcie_ep_priv *priv)
+{
+ u32 status;
+ int ret;
+
+ if (priv->data->is_legacy)
+ return 0;
+
+ /* wait PIPE clock */
+ ret = readl_poll_timeout(priv->base + PCL_PIPEMON, status,
+ status & PCL_PCLK_ALIVE, 100000, 1000000);
+ if (ret) {
+ dev_err(priv->pci.dev,
+ "Failed to initialize controller in EP mode\n");
+ return ret;
+ }
+
+ return 0;
+}
+
static int uniphier_pcie_start_link(struct dw_pcie *pci)
{
struct uniphier_pcie_ep_priv *priv = to_uniphier_pcie(pci);
@@ -209,7 +286,7 @@ uniphier_pcie_get_features(struct dw_pcie_ep *ep)
struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
struct uniphier_pcie_ep_priv *priv = to_uniphier_pcie(pci);
- return priv->features;
+ return &priv->data->features;
}
static const struct dw_pcie_ep_ops uniphier_pcie_ep_ops = {
@@ -248,8 +325,14 @@ static int uniphier_pcie_ep_enable(struct uniphier_pcie_ep_priv *priv)
uniphier_pcie_phy_reset(priv, false);
+ ret = uniphier_pcie_wait_ep(priv);
+ if (ret)
+ goto out_phy_exit;
+
return 0;
+out_phy_exit:
+ phy_exit(priv->phy);
out_rst_gio_assert:
reset_control_assert(priv->rst_gio);
out_rst_assert:
@@ -277,8 +360,8 @@ static int uniphier_pcie_ep_probe(struct platform_device *pdev)
if (!priv)
return -ENOMEM;
- priv->features = of_device_get_match_data(dev);
- if (WARN_ON(!priv->features))
+ priv->data = of_device_get_match_data(dev);
+ if (WARN_ON(!priv->data))
return -EINVAL;
priv->pci.dev = dev;
@@ -288,13 +371,15 @@ static int uniphier_pcie_ep_probe(struct platform_device *pdev)
if (IS_ERR(priv->base))
return PTR_ERR(priv->base);
- priv->clk_gio = devm_clk_get(dev, "gio");
- if (IS_ERR(priv->clk_gio))
- return PTR_ERR(priv->clk_gio);
+ if (priv->data->is_legacy) {
+ priv->clk_gio = devm_clk_get(dev, "gio");
+ if (IS_ERR(priv->clk_gio))
+ return PTR_ERR(priv->clk_gio);
- priv->rst_gio = devm_reset_control_get_shared(dev, "gio");
- if (IS_ERR(priv->rst_gio))
- return PTR_ERR(priv->rst_gio);
+ priv->rst_gio = devm_reset_control_get_shared(dev, "gio");
+ if (IS_ERR(priv->rst_gio))
+ return PTR_ERR(priv->rst_gio);
+ }
priv->clk = devm_clk_get(dev, "link");
if (IS_ERR(priv->clk))
@@ -321,13 +406,16 @@ static int uniphier_pcie_ep_probe(struct platform_device *pdev)
return dw_pcie_ep_init(&priv->pci.ep);
}
-static const struct pci_epc_features uniphier_pro5_data = {
- .linkup_notifier = false,
- .msi_capable = true,
- .msix_capable = false,
- .align = 1 << 16,
- .bar_fixed_64bit = BIT(BAR_0) | BIT(BAR_2) | BIT(BAR_4),
- .reserved_bar = BIT(BAR_4),
+static const struct uniphier_pcie_ep_soc_data uniphier_pro5_data = {
+ .is_legacy = true,
+ .features = {
+ .linkup_notifier = false,
+ .msi_capable = true,
+ .msix_capable = false,
+ .align = 1 << 16,
+ .bar_fixed_64bit = BIT(BAR_0) | BIT(BAR_2) | BIT(BAR_4),
+ .reserved_bar = BIT(BAR_4),
+ },
};
static const struct of_device_id uniphier_pcie_ep_match[] = {
--
2.7.4
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