[PATCH 3/4] PCI: j721e: Add PCIe support for j7200
Kishon Vijay Abraham I
kishon at ti.com
Thu Mar 25 09:09:35 GMT 2021
J7200 has the same PCIe IP as in J721E with minor changes in the
wrapper. Add PCIe support for j7200 accounting for the wrapper
changes in pci-j721e.c
Changes from J721E:
*) Allows byte access of bridge configuration space registers
*) Changes in legacy interrupt register map
Signed-off-by: Kishon Vijay Abraham I <kishon at ti.com>
---
drivers/pci/controller/cadence/pci-j721e.c | 111 ++++++++++++++++++---
1 file changed, 99 insertions(+), 12 deletions(-)
diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c
index 17db86a51ca8..f175f116abf6 100644
--- a/drivers/pci/controller/cadence/pci-j721e.c
+++ b/drivers/pci/controller/cadence/pci-j721e.c
@@ -27,6 +27,7 @@
#define STATUS_REG_SYS_2 0x508
#define STATUS_CLR_REG_SYS_2 0x708
#define LINK_DOWN BIT(1)
+#define J7200_LINK_DOWN BIT(10)
#define EOI_REG 0x10
@@ -35,6 +36,10 @@
#define STATUS_CLR_REG_SYS_0 0x700
#define INTx_EN(num) (1 << (num))
+#define ENABLE_REG_SYS_1 0x104
+#define STATUS_REG_SYS_1 0x504
+#define SYS1_INTx_EN(num) (1 << (22 + (num)))
+
#define J721E_PCIE_USER_CMD_STATUS 0x4
#define LINK_TRAINING_ENABLE BIT(0)
@@ -48,6 +53,14 @@ enum link_status {
LINK_UP_DL_COMPLETED,
};
+#define USER_EOI_REG 0xC8
+enum eoi_reg {
+ EOI_DOWNSTREAM_INTERRUPT,
+ EOI_FLR_INTERRUPT,
+ EOI_LEGACY_INTERRUPT,
+ EOI_POWER_STATE_INTERRUPT,
+};
+
#define J721E_MODE_RC BIT(7)
#define LANE_COUNT_MASK BIT(8)
#define LANE_COUNT(n) ((n) << 8)
@@ -65,6 +78,8 @@ struct j721e_pcie {
void __iomem *user_cfg_base;
void __iomem *intd_cfg_base;
struct irq_domain *legacy_irq_domain;
+ bool is_intc_v1;
+ u32 link_irq_reg_field;
};
enum j721e_pcie_mode {
@@ -75,6 +90,9 @@ enum j721e_pcie_mode {
struct j721e_pcie_data {
enum j721e_pcie_mode mode;
bool quirk_retrain_flag;
+ bool is_intc_v1;
+ bool byte_access_allowed;
+ const struct cdns_pcie_ops *ops;
};
static inline u32 j721e_pcie_user_readl(struct j721e_pcie *pcie, u32 offset)
@@ -106,12 +124,12 @@ static irqreturn_t j721e_pcie_link_irq_handler(int irq, void *priv)
u32 reg;
reg = j721e_pcie_intd_readl(pcie, STATUS_REG_SYS_2);
- if (!(reg & LINK_DOWN))
+ if (!(reg & pcie->link_irq_reg_field))
return IRQ_NONE;
dev_err(dev, "LINK DOWN!\n");
- j721e_pcie_intd_writel(pcie, STATUS_CLR_REG_SYS_2, LINK_DOWN);
+ j721e_pcie_intd_writel(pcie, STATUS_CLR_REG_SYS_2, pcie->link_irq_reg_field);
return IRQ_HANDLED;
}
@@ -119,12 +137,40 @@ static void j721e_pcie_config_link_irq(struct j721e_pcie *pcie)
{
u32 reg;
+ pcie->link_irq_reg_field = J7200_LINK_DOWN;
+ if (pcie->is_intc_v1)
+ pcie->link_irq_reg_field = LINK_DOWN;
+
reg = j721e_pcie_intd_readl(pcie, ENABLE_REG_SYS_2);
- reg |= LINK_DOWN;
+ reg |= pcie->link_irq_reg_field;
j721e_pcie_intd_writel(pcie, ENABLE_REG_SYS_2, reg);
}
static void j721e_pcie_legacy_irq_handler(struct irq_desc *desc)
+{
+ struct j721e_pcie *pcie = irq_desc_get_handler_data(desc);
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ int virq;
+ u32 reg;
+ int i;
+
+ chained_irq_enter(chip, desc);
+
+ for (i = 0; i < PCI_NUM_INTX; i++) {
+ reg = j721e_pcie_intd_readl(pcie, STATUS_REG_SYS_1);
+ if (!(reg & SYS1_INTx_EN(i)))
+ continue;
+
+ virq = irq_find_mapping(pcie->legacy_irq_domain, i);
+ generic_handle_irq(virq);
+ j721e_pcie_user_writel(pcie, USER_EOI_REG,
+ EOI_LEGACY_INTERRUPT);
+ }
+
+ chained_irq_exit(chip, desc);
+}
+
+static void j721e_pcie_v1_legacy_irq_handler(struct irq_desc *desc)
{
int i;
u32 reg;
@@ -182,8 +228,14 @@ static int j721e_pcie_config_legacy_irq(struct j721e_pcie *pcie)
dev_err(dev, "Failed to parse and map legacy irq\n");
return -EINVAL;
}
- irq_set_chained_handler_and_data(irq, j721e_pcie_legacy_irq_handler,
- pcie);
+
+ if (pcie->is_intc_v1) {
+ irq_set_chained_handler_and_data(irq, j721e_pcie_v1_legacy_irq_handler,
+ pcie);
+ } else {
+ irq_set_chained_handler_and_data(irq, j721e_pcie_legacy_irq_handler,
+ pcie);
+ }
legacy_irq_domain = irq_domain_add_linear(intc_node, PCI_NUM_INTX,
&j721e_pcie_intx_domain_ops,
@@ -194,10 +246,18 @@ static int j721e_pcie_config_legacy_irq(struct j721e_pcie *pcie)
}
pcie->legacy_irq_domain = legacy_irq_domain;
- for (i = 0; i < PCI_NUM_INTX; i++) {
- reg = j721e_pcie_intd_readl(pcie, ENABLE_REG_SYS_0);
- reg |= INTx_EN(i);
- j721e_pcie_intd_writel(pcie, ENABLE_REG_SYS_0, reg);
+ if (pcie->is_intc_v1) {
+ for (i = 0; i < PCI_NUM_INTX; i++) {
+ reg = j721e_pcie_intd_readl(pcie, ENABLE_REG_SYS_0);
+ reg |= INTx_EN(i);
+ j721e_pcie_intd_writel(pcie, ENABLE_REG_SYS_0, reg);
+ }
+ } else {
+ for (i = 0; i < PCI_NUM_INTX; i++) {
+ reg = j721e_pcie_intd_readl(pcie, ENABLE_REG_SYS_1);
+ reg |= SYS1_INTx_EN(i);
+ j721e_pcie_intd_writel(pcie, ENABLE_REG_SYS_1, reg);
+ }
}
return 0;
@@ -244,6 +304,12 @@ static const struct cdns_pcie_ops j721e_pcie_ops = {
.link_up = j721e_pcie_link_up,
};
+static const struct cdns_pcie_ops j7200_pcie_ops = {
+ .start_link = j721e_pcie_start_link,
+ .stop_link = j721e_pcie_stop_link,
+ .link_up = j721e_pcie_link_up,
+};
+
static int j721e_pcie_set_mode(struct j721e_pcie *pcie, struct regmap *syscon,
unsigned int offset)
{
@@ -371,10 +437,21 @@ static struct pci_ops cdns_ti_pcie_host_ops = {
static const struct j721e_pcie_data j721e_pcie_rc_data = {
.mode = PCI_MODE_RC,
.quirk_retrain_flag = true,
+ .is_intc_v1 = true,
+ .byte_access_allowed = false,
+ .ops = &j721e_pcie_ops,
};
static const struct j721e_pcie_data j721e_pcie_ep_data = {
.mode = PCI_MODE_EP,
+ .ops = &j721e_pcie_ops,
+};
+
+static const struct j721e_pcie_data j7200_pcie_rc_data = {
+ .mode = PCI_MODE_RC,
+ .is_intc_v1 = false,
+ .byte_access_allowed = true,
+ .ops = &j7200_pcie_ops,
};
static const struct of_device_id of_j721e_pcie_match[] = {
@@ -386,6 +463,10 @@ static const struct of_device_id of_j721e_pcie_match[] = {
.compatible = "ti,j721e-pcie-ep",
.data = &j721e_pcie_ep_data,
},
+ {
+ .compatible = "ti,j7200-pcie-host",
+ .data = &j7200_pcie_rc_data,
+ },
{},
};
@@ -393,9 +474,11 @@ static int j721e_pcie_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *node = dev->of_node;
+ const struct cdns_pcie_ops *ops;
struct pci_host_bridge *bridge;
struct j721e_pcie_data *data;
struct cdns_pcie *cdns_pcie;
+ bool byte_access_allowed;
struct j721e_pcie *pcie;
struct cdns_pcie_rc *rc;
struct cdns_pcie_ep *ep;
@@ -412,6 +495,8 @@ static int j721e_pcie_probe(struct platform_device *pdev)
return -EINVAL;
mode = (u32)data->mode;
+ byte_access_allowed = data->byte_access_allowed;
+ ops = data->ops;
pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
if (!pcie)
@@ -419,6 +504,7 @@ static int j721e_pcie_probe(struct platform_device *pdev)
pcie->dev = dev;
pcie->mode = mode;
+ pcie->is_intc_v1 = data->is_intc_v1;
base = devm_platform_ioremap_resource_byname(pdev, "intd_cfg");
if (IS_ERR(base))
@@ -482,13 +568,14 @@ static int j721e_pcie_probe(struct platform_device *pdev)
goto err_get_sync;
}
- bridge->ops = &cdns_ti_pcie_host_ops;
+ if (!byte_access_allowed)
+ bridge->ops = &cdns_ti_pcie_host_ops;
rc = pci_host_bridge_priv(bridge);
rc->quirk_retrain_flag = data->quirk_retrain_flag;
cdns_pcie = &rc->pcie;
cdns_pcie->dev = dev;
- cdns_pcie->ops = &j721e_pcie_ops;
+ cdns_pcie->ops = ops;
pcie->cdns_pcie = cdns_pcie;
gpiod = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
@@ -552,7 +639,7 @@ static int j721e_pcie_probe(struct platform_device *pdev)
cdns_pcie = &ep->pcie;
cdns_pcie->dev = dev;
- cdns_pcie->ops = &j721e_pcie_ops;
+ cdns_pcie->ops = ops;
pcie->cdns_pcie = cdns_pcie;
ret = cdns_pcie_init_phy(dev, cdns_pcie);
--
2.17.1
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