Linux-PCI Archive on lore.kernel.org
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From: "Z.q. Hou" <zhiqiang.hou@nxp.com>
To: "linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"bhelgaas@google.com" <bhelgaas@google.com>,
	"robh+dt@kernel.org" <robh+dt@kernel.org>,
	"mark.rutland@arm.com" <mark.rutland@arm.com>,
	"l.subrahmanya@mobiveil.co.in" <l.subrahmanya@mobiveil.co.in>,
	"shawnguo@kernel.org" <shawnguo@kernel.org>,
	Leo Li <leoyang.li@nxp.com>,
	"lorenzo.pieralisi@arm.com" <lorenzo.pieralisi@arm.com>,
	"catalin.marinas@arm.com" <catalin.marinas@arm.com>,
	"will.deacon@arm.com" <will.deacon@arm.com>
Cc: Mingkai Hu <mingkai.hu@nxp.com>,
	"M.h. Lian" <minghuan.lian@nxp.com>,
	Xiaowei Bao <xiaowei.bao@nxp.com>,
	"Z.q. Hou" <zhiqiang.hou@nxp.com>
Subject: [PATCHv4 24/28] PCI: mobiveil: add PCIe Gen4 RC driver for NXP Layerscape SoCs
Date: Mon, 11 Mar 2019 09:33:16 +0000
Message-ID: <20190311093130.7209-25-Zhiqiang.Hou@nxp.com> (raw)
In-Reply-To: <20190311093130.7209-1-Zhiqiang.Hou@nxp.com>

From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>

This PCIe controller is based on the Mobiveil GPEX IP, which is
compatible with the PCI Express™ Base Specification, Revision 4.0.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Reviewed-by: Minghuan Lian <Minghuan.Lian@nxp.com>
---
V4:
 - no change

 drivers/pci/controller/mobiveil/Kconfig       |  10 +
 drivers/pci/controller/mobiveil/Makefile      |   1 +
 .../controller/mobiveil/pci-layerscape-gen4.c | 254 ++++++++++++++++++
 .../pci/controller/mobiveil/pcie-mobiveil.h   |  16 +-
 4 files changed, 279 insertions(+), 2 deletions(-)
 create mode 100644 drivers/pci/controller/mobiveil/pci-layerscape-gen4.c

diff --git a/drivers/pci/controller/mobiveil/Kconfig b/drivers/pci/controller/mobiveil/Kconfig
index 64343c07bfed..3ddb7d6163a9 100644
--- a/drivers/pci/controller/mobiveil/Kconfig
+++ b/drivers/pci/controller/mobiveil/Kconfig
@@ -21,4 +21,14 @@ config PCIE_MOBIVEIL_PLAT
 	  Soft IP. It has up to 8 outbound and inbound windows
 	  for address translation and it is a PCIe Gen4 IP.
 
+config PCI_LAYERSCAPE_GEN4
+	bool "Freescale Layerscpe PCIe Gen4 controller"
+	depends on PCI
+	depends on OF && (ARM64 || ARCH_LAYERSCAPE)
+	depends on PCI_MSI_IRQ_DOMAIN
+	select PCIE_MOBIVEIL_HOST
+	help
+	  Say Y here if you want PCIe Gen4 controller support on
+	  Layerscape SoCs. The PCIe controller can work in RC or
+	  EP mode according to RCW[HOST_AGT_PEX] setting.
 endmenu
diff --git a/drivers/pci/controller/mobiveil/Makefile b/drivers/pci/controller/mobiveil/Makefile
index 9fb6d1c6504d..ff66774ccac4 100644
--- a/drivers/pci/controller/mobiveil/Makefile
+++ b/drivers/pci/controller/mobiveil/Makefile
@@ -2,3 +2,4 @@
 obj-$(CONFIG_PCIE_MOBIVEIL) += pcie-mobiveil.o
 obj-$(CONFIG_PCIE_MOBIVEIL_HOST) += pcie-mobiveil-host.o
 obj-$(CONFIG_PCIE_MOBIVEIL_PLAT) += pcie-mobiveil-plat.o
+obj-$(CONFIG_PCI_LAYERSCAPE_GEN4) += pci-layerscape-gen4.o
diff --git a/drivers/pci/controller/mobiveil/pci-layerscape-gen4.c b/drivers/pci/controller/mobiveil/pci-layerscape-gen4.c
new file mode 100644
index 000000000000..174cbcac4059
--- /dev/null
+++ b/drivers/pci/controller/mobiveil/pci-layerscape-gen4.c
@@ -0,0 +1,254 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCIe host controller driver for NXP Layerscape SoCs
+ *
+ * Copyright 2018 NXP
+ *
+ * Author: Zhiqiang Hou <Zhiqiang.Hou@nxp.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/of_pci.h>
+#include <linux/of_platform.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/resource.h>
+#include <linux/mfd/syscon.h>
+#include <linux/regmap.h>
+
+#include "pcie-mobiveil.h"
+
+/* LUT and PF control registers */
+#define PCIE_LUT_OFF			(0x80000)
+#define PCIE_PF_OFF			(0xc0000)
+#define PCIE_PF_INT_STAT		(0x18)
+#define PF_INT_STAT_PABRST		(31)
+
+#define PCIE_PF_DBG			(0x7fc)
+#define PF_DBG_LTSSM_MASK		(0x3f)
+#define PF_DBG_WE			(31)
+#define PF_DBG_PABR			(27)
+
+#define LS_PCIE_G4_LTSSM_L0		0x2d /* L0 state */
+
+#define to_ls_pcie_g4(x)		platform_get_drvdata((x)->pdev)
+
+struct ls_pcie_g4 {
+	struct mobiveil_pcie *pci;
+	struct delayed_work dwork;
+	int irq;
+};
+
+static inline u32 ls_pcie_g4_lut_readl(struct ls_pcie_g4 *pcie, u32 off)
+{
+	return ioread32(pcie->pci->csr_axi_slave_base + PCIE_LUT_OFF + off);
+}
+
+static inline void ls_pcie_g4_lut_writel(struct ls_pcie_g4 *pcie,
+					 u32 off, u32 val)
+{
+	iowrite32(val, pcie->pci->csr_axi_slave_base + PCIE_LUT_OFF + off);
+}
+
+static inline u32 ls_pcie_g4_pf_readl(struct ls_pcie_g4 *pcie, u32 off)
+{
+	return ioread32(pcie->pci->csr_axi_slave_base + PCIE_PF_OFF + off);
+}
+
+static inline void ls_pcie_g4_pf_writel(struct ls_pcie_g4 *pcie,
+					u32 off, u32 val)
+{
+	iowrite32(val, pcie->pci->csr_axi_slave_base + PCIE_PF_OFF + off);
+}
+
+static bool ls_pcie_g4_is_bridge(struct ls_pcie_g4 *pcie)
+{
+	struct mobiveil_pcie *mv_pci = pcie->pci;
+	u32 header_type;
+
+	header_type = csr_readb(mv_pci, PCI_HEADER_TYPE);
+	header_type &= 0x7f;
+
+	return header_type == PCI_HEADER_TYPE_BRIDGE;
+}
+
+static int ls_pcie_g4_link_up(struct mobiveil_pcie *pci)
+{
+	struct ls_pcie_g4 *pcie = to_ls_pcie_g4(pci);
+	u32 state;
+
+	state = ls_pcie_g4_pf_readl(pcie, PCIE_PF_DBG);
+	state =	state & PF_DBG_LTSSM_MASK;
+
+	if (state == LS_PCIE_G4_LTSSM_L0)
+		return 1;
+
+	return 0;
+}
+
+static void ls_pcie_g4_reinit_hw(struct ls_pcie_g4 *pcie)
+{
+	struct mobiveil_pcie *mv_pci = pcie->pci;
+	u32 val, act_stat;
+	int to = 100;
+
+	/* Poll for pab_csb_reset to set and PAB activity to clear */
+	do {
+		usleep_range(10, 15);
+		val = ls_pcie_g4_pf_readl(pcie, PCIE_PF_INT_STAT);
+		act_stat = csr_readl(mv_pci, PAB_ACTIVITY_STAT);
+	} while (((val & 1 << PF_INT_STAT_PABRST) == 0 || act_stat) && to--);
+	if (to < 0) {
+		dev_err(&mv_pci->pdev->dev, "poll PABRST&PABACT timeout\n");
+		return;
+	}
+
+	/* clear PEX_RESET bit in PEX_PF0_DBG register */
+	val = ls_pcie_g4_pf_readl(pcie, PCIE_PF_DBG);
+	val |= 1 << PF_DBG_WE;
+	ls_pcie_g4_pf_writel(pcie, PCIE_PF_DBG, val);
+
+	val = ls_pcie_g4_pf_readl(pcie, PCIE_PF_DBG);
+	val |= 1 << PF_DBG_PABR;
+	ls_pcie_g4_pf_writel(pcie, PCIE_PF_DBG, val);
+
+	val = ls_pcie_g4_pf_readl(pcie, PCIE_PF_DBG);
+	val &= ~(1 << PF_DBG_WE);
+	ls_pcie_g4_pf_writel(pcie, PCIE_PF_DBG, val);
+
+	mobiveil_host_init(mv_pci, true);
+
+	to = 100;
+	while (!ls_pcie_g4_link_up(mv_pci) && to--)
+		usleep_range(200, 250);
+	if (to < 0)
+		dev_err(&mv_pci->pdev->dev, "PCIe link trainning timeout\n");
+}
+
+static irqreturn_t ls_pcie_g4_handler(int irq, void *dev_id)
+{
+	struct ls_pcie_g4 *pcie = (struct ls_pcie_g4 *)dev_id;
+	struct mobiveil_pcie *mv_pci = pcie->pci;
+	u32 val;
+
+	val = csr_readl(mv_pci, PAB_INTP_AMBA_MISC_STAT);
+	if (!val)
+		return IRQ_NONE;
+
+	if (val & PAB_INTP_RESET)
+		schedule_delayed_work(&pcie->dwork, msecs_to_jiffies(1));
+
+	csr_writel(mv_pci, val, PAB_INTP_AMBA_MISC_STAT);
+
+	return IRQ_HANDLED;
+}
+
+static int ls_pcie_g4_interrupt_init(struct mobiveil_pcie *mv_pci)
+{
+	struct ls_pcie_g4 *pcie = to_ls_pcie_g4(mv_pci);
+	u32 val;
+	int ret;
+
+	pcie->irq = platform_get_irq_byname(mv_pci->pdev, "intr");
+	if (pcie->irq < 0) {
+		dev_err(&mv_pci->pdev->dev, "Can't get 'intr' irq.\n");
+		return pcie->irq;
+	}
+	ret = devm_request_irq(&mv_pci->pdev->dev, pcie->irq,
+			       ls_pcie_g4_handler, IRQF_SHARED,
+			       mv_pci->pdev->name, pcie);
+	if (ret) {
+		dev_err(&mv_pci->pdev->dev, "Can't register PCIe IRQ.\n");
+		return  ret;
+	}
+
+	/* Enable interrupts */
+	val = PAB_INTP_INTX_MASK | PAB_INTP_MSI | PAB_INTP_RESET |
+	      PAB_INTP_PCIE_UE | PAB_INTP_IE_PMREDI | PAB_INTP_IE_EC;
+	csr_writel(mv_pci, val, PAB_INTP_AMBA_MISC_ENB);
+
+	return 0;
+}
+
+static void ls_pcie_g4_reset(struct work_struct *work)
+{
+	struct delayed_work *dwork = container_of(work, struct delayed_work,
+						  work);
+	struct ls_pcie_g4 *pcie = container_of(dwork, struct ls_pcie_g4, dwork);
+	struct mobiveil_pcie *mv_pci = pcie->pci;
+	u16 ctrl;
+
+	ctrl = csr_readw(mv_pci, PCI_BRIDGE_CONTROL);
+	ctrl &= ~PCI_BRIDGE_CTL_BUS_RESET;
+	csr_writew(mv_pci, ctrl, PCI_BRIDGE_CONTROL);
+	ls_pcie_g4_reinit_hw(pcie);
+}
+
+static struct mobiveil_rp_ops ls_pcie_g4_rp_ops = {
+	.interrupt_init = ls_pcie_g4_interrupt_init,
+};
+
+static const struct mobiveil_pab_ops ls_pcie_g4_pab_ops = {
+	.link_up = ls_pcie_g4_link_up,
+};
+
+static int __init ls_pcie_g4_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct mobiveil_pcie *mv_pci;
+	struct ls_pcie_g4 *pcie;
+	struct device_node *np = dev->of_node;
+	int ret;
+
+	if (!of_parse_phandle(np, "msi-parent", 0)) {
+		dev_err(dev, "failed to find msi-parent\n");
+		return -EINVAL;
+	}
+
+	pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
+	if (!pcie)
+		return -ENOMEM;
+
+	mv_pci = devm_kzalloc(dev, sizeof(*mv_pci), GFP_KERNEL);
+	if (!mv_pci)
+		return -ENOMEM;
+
+	mv_pci->pdev = pdev;
+	mv_pci->ops = &ls_pcie_g4_pab_ops;
+	mv_pci->rp.ops = &ls_pcie_g4_rp_ops;
+	pcie->pci = mv_pci;
+
+	platform_set_drvdata(pdev, pcie);
+
+	INIT_DELAYED_WORK(&pcie->dwork, ls_pcie_g4_reset);
+
+	ret = mobiveil_pcie_host_probe(mv_pci);
+	if (ret) {
+		dev_err(dev, "fail to probe!\n");
+		return  ret;
+	}
+
+	if (!ls_pcie_g4_is_bridge(pcie))
+		return -ENODEV;
+
+	return 0;
+}
+
+static const struct of_device_id ls_pcie_g4_of_match[] = {
+	{ .compatible = "fsl,lx2160a-pcie", },
+	{ },
+};
+
+static struct platform_driver ls_pcie_g4_driver = {
+	.driver = {
+		.name = "layerscape-pcie-gen4",
+		.of_match_table = ls_pcie_g4_of_match,
+		.suppress_bind_attrs = true,
+	},
+};
+
+builtin_platform_driver_probe(ls_pcie_g4_driver, ls_pcie_g4_probe);
diff --git a/drivers/pci/controller/mobiveil/pcie-mobiveil.h b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
index 0f5303962e88..0ccd6cee5f8f 100644
--- a/drivers/pci/controller/mobiveil/pcie-mobiveil.h
+++ b/drivers/pci/controller/mobiveil/pcie-mobiveil.h
@@ -41,6 +41,8 @@
 #define  PAGE_LO_MASK			0x3ff
 #define  PAGE_SEL_OFFSET_SHIFT		10
 
+#define PAB_ACTIVITY_STAT		0x81c
+
 #define PAB_AXI_PIO_CTRL		0x0840
 #define  APIO_EN_MASK			0xf
 
@@ -49,8 +51,18 @@
 
 #define PAB_INTP_AMBA_MISC_ENB		0x0b0c
 #define PAB_INTP_AMBA_MISC_STAT		0x0b1c
-#define  PAB_INTP_INTX_MASK		0x01e0
-#define  PAB_INTP_MSI_MASK		0x8
+#define  PAB_INTP_RESET			(0x1 << 1)
+#define  PAB_INTP_MSI			(0x1 << 3)
+#define  PAB_INTP_INTA			(0x1 << 5)
+#define  PAB_INTP_INTB			(0x1 << 6)
+#define  PAB_INTP_INTC			(0x1 << 7)
+#define  PAB_INTP_INTD			(0x1 << 8)
+#define  PAB_INTP_PCIE_UE		(0x1 << 9)
+#define  PAB_INTP_IE_PMREDI		(0x1 << 29)
+#define  PAB_INTP_IE_EC			(0x1 << 30)
+#define  PAB_INTP_MSI_MASK		PAB_INTP_MSI
+#define  PAB_INTP_INTX_MASK		(PAB_INTP_INTA | PAB_INTP_INTB |\
+					PAB_INTP_INTC | PAB_INTP_INTD)
 
 #define PAB_AXI_AMAP_CTRL(win)		PAB_REG_ADDR(0x0ba0, win)
 #define  WIN_ENABLE_SHIFT		0
-- 
2.17.1


  parent reply index

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-11  9:29 [PATCHv4 00/28] PCI: refactor Mobiveil driver and add PCIe Gen4 " Z.q. Hou
2019-03-11  9:30 ` [PATCHv4 01/28] PCI: mobiveil: uniform the register accessors Z.q. Hou
2019-03-11  9:30 ` [PATCHv4 02/28] PCI: mobiveil: format the code without function change Z.q. Hou
2019-03-11  9:30 ` [PATCHv4 03/28] PCI: mobiveil: correct the returned error number Z.q. Hou
2019-03-11  9:30 ` [PATCHv4 04/28] PCI: mobiveil: remove flag MSI_FLAG_MULTI_PCI_MSI Z.q. Hou
2019-03-11  9:30 ` [PATCHv4 05/28] PCI: mobiveil: correct PCI base address in MEM/IO outbound windows Z.q. Hou
2019-03-11  9:30 ` [PATCHv4 06/28] PCI: mobiveil: replace the resource list iteration function Z.q. Hou
2019-03-11  9:30 ` [PATCHv4 07/28] PCI: mobiveil: use WIN_NUM_0 explicitly for CFG outbound window Z.q. Hou
2019-03-11  9:31 ` [PATCHv4 08/28] PCI: mobiveil: use the 1st inbound window for MEM inbound transactions Z.q. Hou
2019-03-11  9:31 ` [PATCHv4 09/28] PCI: mobiveil: correct inbound/outbound window setup routines Z.q. Hou
2019-03-11  9:31 ` [PATCHv4 10/28] PCI: mobiveil: fix the INTx process error Z.q. Hou
2019-03-11 14:08   ` Bjorn Helgaas
2019-03-12  4:42     ` Z.q. Hou
2019-03-11  9:31 ` [PATCHv4 11/28] PCI: mobiveil: only fix up the Class Code field Z.q. Hou
2019-03-11 14:14   ` Bjorn Helgaas
2019-03-12  9:17     ` Z.q. Hou
2019-03-13 10:59       ` Subrahmanya Lingappa
2019-03-11  9:31 ` [PATCHv4 12/28] PCI: mobiveil: move out the link up waiting from mobiveil_host_init Z.q. Hou
2019-03-11  9:31 ` [PATCHv4 13/28] PCI: mobiveil: move irq chained handler setup out of DT parse Z.q. Hou
2019-03-11  9:31 ` [PATCHv4 14/28] PCI: mobiveil: initialize Primary/Secondary/Subordinate bus number Z.q. Hou
2019-03-11  9:31 ` [PATCHv4 15/28] dt-bindings: pci: mobiveil: change gpio_slave and apb_csr to optional Z.q. Hou
2019-03-11  9:32 ` [PATCHv4 16/28] PCI: mobiveil: refactor Mobiveil PCIe Host Bridge IP driver Z.q. Hou
2019-03-26 17:34   ` Lorenzo Pieralisi
2019-03-27  2:04     ` Z.q. Hou
2019-03-27 17:39       ` Lorenzo Pieralisi
2019-03-28  2:09         ` Z.q. Hou
2019-03-28 16:09           ` Lorenzo Pieralisi
2019-03-29  6:07             ` Z.q. Hou
2019-03-11  9:32 ` [PATCHv4 17/28] PCI: mobiveil: fix the checking of valid device Z.q. Hou
2019-03-11  9:32 ` [PATCHv4 18/28] PCI: mobiveil: add link up condition check Z.q. Hou
2019-03-11  9:32 ` [PATCHv4 19/28] PCI: mobiveil: continue to initialize the host upon no PCIe link Z.q. Hou
2019-03-11  9:32 ` [PATCHv4 20/28] PCI: mobiveil: disabled IB and OB windows set by bootloader Z.q. Hou
2019-03-11  9:32 ` [PATCHv4 21/28] PCI: mobiveil: add Byte and Half-Word width register accessors Z.q. Hou
2019-03-11  9:32 ` [PATCHv4 22/28] PCI: mobiveil: make mobiveil_host_init can be used to re-init host Z.q. Hou
2019-03-11  9:33 ` [PATCHv4 23/28] dt-bindings: pci: Add NXP Layerscape SoCs PCIe Gen4 controller Z.q. Hou
2019-03-11 22:11   ` Rob Herring
2019-03-12  3:17     ` Z.q. Hou
2019-03-12  9:42   ` Z.q. Hou
2019-03-11  9:33 ` Z.q. Hou [this message]
2019-03-11 14:01   ` [PATCHv4 24/28] PCI: mobiveil: add PCIe Gen4 RC driver for NXP Layerscape SoCs Bjorn Helgaas
2019-03-12  4:40     ` Z.q. Hou
2019-03-11  9:33 ` [PATCHv4 25/28] PCI: mobiveil: ls_pcie_g4: add Workaround for A-011577 Z.q. Hou
2019-03-13 14:51   ` Z.q. Hou
2019-03-11  9:33 ` [PATCHv4 26/28] PCI: mobiveil: ls_pcie_g4: add Workaround for A-011451 Z.q. Hou
2019-03-11 17:34   ` Bjorn Helgaas
2019-03-12  9:34     ` Z.q. Hou
2019-03-12 13:34       ` Bjorn Helgaas
2019-03-13 14:49         ` Z.q. Hou
2019-03-13 14:51   ` Z.q. Hou
2019-03-11  9:33 ` [PATCHv4 27/28] arm64: dts: freescale: lx2160a: add pcie DT nodes Z.q. Hou
2019-03-11  9:33 ` [PATCHv4 28/28] arm64: defconfig: Enable CONFIG_PCI_LAYERSCAPE_GEN4 Z.q. Hou
2019-03-11 13:33 ` [PATCHv4 00/28] PCI: refactor Mobiveil driver and add PCIe Gen4 driver for NXP Layerscape SoCs Bjorn Helgaas
2019-03-12  4:18   ` Z.q. Hou
2019-03-26 17:37 ` Lorenzo Pieralisi
2019-03-27  2:11   ` Z.q. Hou

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	public-inbox-index linux-pci

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-pci


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git