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Merge branch 'remotes/lorenzo/pci/qcom' 

- Move qcom driver to bulk clock API (Bjorn Andersson)

  - Add Qualcomm QCS404 PCIe controller support (Bjorn Andersson)

  - Ensure Qualcomm PERST is asserted for at least 100ms (Niklas Cassel)

* remotes/lorenzo/pci/qcom:
  PCI: qcom: Ensure that PERST is asserted for at least 100 ms
  PCI: qcom: Add QCS404 PCIe controller support
  dt-bindings: PCI: qcom: Add QCS404 to the binding
  PCI: qcom: Use clk bulk API for 2.4.0 controllers
This commit is contained in:
Bjorn Helgaas 2019-07-12 17:08:35 -05:00
parent 3d663fc0f2 64adde31c8
commit 757410bd97
2 changed files with 73 additions and 59 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
Documentation/devicetree/bindings/pci/qcom,pcie.txt
View File

@ -10,6 +10,7 @@
- "qcom,pcie-msm8996" for msm8996 or apq8096
- "qcom,pcie-ipq4019" for ipq4019
- "qcom,pcie-ipq8074" for ipq8074
- "qcom,pcie-qcs404" for qcs404
- reg:
Usage: required
@ -116,6 +117,15 @@
- "ahb" AHB clock
- "aux" Auxiliary clock
- clock-names:
Usage: required for qcs404
Value type: <stringlist>
Definition: Should contain the following entries
- "iface" AHB clock
- "aux" Auxiliary clock
- "master_bus" AXI Master clock
- "slave_bus" AXI Slave clock
- resets:
Usage: required
Value type: <prop-encoded-array>
@ -167,6 +177,17 @@
- "ahb" AHB Reset
- "axi_m_sticky" AXI Master Sticky reset
- reset-names:
Usage: required for qcs404
Value type: <stringlist>
Definition: Should contain the following entries
- "axi_m" AXI Master reset
- "axi_s" AXI Slave reset
- "axi_m_sticky" AXI Master Sticky reset
- "pipe_sticky" PIPE sticky reset
- "pwr" PWR reset
- "ahb" AHB reset
- power-domains:
Usage: required for apq8084 and msm8996/apq8096
Value type: <prop-encoded-array>
@ -195,12 +216,12 @@
Definition: A phandle to the PCIe endpoint power supply
- phys:
Usage: required for apq8084
Usage: required for apq8084 and qcs404
Value type: <phandle>
Definition: List of phandle(s) as listed in phy-names property
- phy-names:
Usage: required for apq8084
Usage: required for apq8084 and qcs404
Value type: <stringlist>
Definition: Should contain "pciephy"

107
drivers/pci/controller/dwc/pcie-qcom.c
View File

@ -112,10 +112,10 @@ struct qcom_pcie_resources_2_3_2 {
struct regulator_bulk_data supplies[QCOM_PCIE_2_3_2_MAX_SUPPLY];
};
#define QCOM_PCIE_2_4_0_MAX_CLOCKS 4
struct qcom_pcie_resources_2_4_0 {
struct clk *aux_clk;
struct clk *master_clk;
struct clk *slave_clk;
struct clk_bulk_data clks[QCOM_PCIE_2_4_0_MAX_CLOCKS];
int num_clks;
struct reset_control *axi_m_reset;
struct reset_control *axi_s_reset;
struct reset_control *pipe_reset;
@ -178,6 +178,8 @@ static void qcom_ep_reset_assert(struct qcom_pcie *pcie)
static void qcom_ep_reset_deassert(struct qcom_pcie *pcie)
{
/* Ensure that PERST has been asserted for at least 100 ms */
msleep(100);
gpiod_set_value_cansleep(pcie->reset, 0);
usleep_range(PERST_DELAY_US, PERST_DELAY_US + 500);
}
@ -638,18 +640,20 @@ static int qcom_pcie_get_resources_2_4_0(struct qcom_pcie *pcie)
struct qcom_pcie_resources_2_4_0 *res = &pcie->res.v2_4_0;
struct dw_pcie *pci = pcie->pci;
struct device *dev = pci->dev;
bool is_ipq = of_device_is_compatible(dev->of_node, "qcom,pcie-ipq4019");
int ret;
res->aux_clk = devm_clk_get(dev, "aux");
if (IS_ERR(res->aux_clk))
return PTR_ERR(res->aux_clk);
res->clks[0].id = "aux";
res->clks[1].id = "master_bus";
res->clks[2].id = "slave_bus";
res->clks[3].id = "iface";
res->master_clk = devm_clk_get(dev, "master_bus");
if (IS_ERR(res->master_clk))
return PTR_ERR(res->master_clk);
/* qcom,pcie-ipq4019 is defined without "iface" */
res->num_clks = is_ipq ? 3 : 4;
res->slave_clk = devm_clk_get(dev, "slave_bus");
if (IS_ERR(res->slave_clk))
return PTR_ERR(res->slave_clk);
ret = devm_clk_bulk_get(dev, res->num_clks, res->clks);
if (ret < 0)
return ret;
res->axi_m_reset = devm_reset_control_get_exclusive(dev, "axi_m");
if (IS_ERR(res->axi_m_reset))
@ -659,27 +663,33 @@ static int qcom_pcie_get_resources_2_4_0(struct qcom_pcie *pcie)
if (IS_ERR(res->axi_s_reset))
return PTR_ERR(res->axi_s_reset);
res->pipe_reset = devm_reset_control_get_exclusive(dev, "pipe");
if (IS_ERR(res->pipe_reset))
return PTR_ERR(res->pipe_reset);
if (is_ipq) {
/*
* These resources relates to the PHY or are secure clocks, but
* are controlled here for IPQ4019
*/
res->pipe_reset = devm_reset_control_get_exclusive(dev, "pipe");
if (IS_ERR(res->pipe_reset))
return PTR_ERR(res->pipe_reset);
res->axi_m_vmid_reset = devm_reset_control_get_exclusive(dev,
"axi_m_vmid");
if (IS_ERR(res->axi_m_vmid_reset))
return PTR_ERR(res->axi_m_vmid_reset);
res->axi_m_vmid_reset = devm_reset_control_get_exclusive(dev,
"axi_m_vmid");
if (IS_ERR(res->axi_m_vmid_reset))
return PTR_ERR(res->axi_m_vmid_reset);
res->axi_s_xpu_reset = devm_reset_control_get_exclusive(dev,
"axi_s_xpu");
if (IS_ERR(res->axi_s_xpu_reset))
return PTR_ERR(res->axi_s_xpu_reset);
res->axi_s_xpu_reset = devm_reset_control_get_exclusive(dev,
"axi_s_xpu");
if (IS_ERR(res->axi_s_xpu_reset))
return PTR_ERR(res->axi_s_xpu_reset);
res->parf_reset = devm_reset_control_get_exclusive(dev, "parf");
if (IS_ERR(res->parf_reset))
return PTR_ERR(res->parf_reset);
res->parf_reset = devm_reset_control_get_exclusive(dev, "parf");
if (IS_ERR(res->parf_reset))
return PTR_ERR(res->parf_reset);
res->phy_reset = devm_reset_control_get_exclusive(dev, "phy");
if (IS_ERR(res->phy_reset))
return PTR_ERR(res->phy_reset);
res->phy_reset = devm_reset_control_get_exclusive(dev, "phy");
if (IS_ERR(res->phy_reset))
return PTR_ERR(res->phy_reset);
}
res->axi_m_sticky_reset = devm_reset_control_get_exclusive(dev,
"axi_m_sticky");
@ -699,9 +709,11 @@ static int qcom_pcie_get_resources_2_4_0(struct qcom_pcie *pcie)
if (IS_ERR(res->ahb_reset))
return PTR_ERR(res->ahb_reset);
res->phy_ahb_reset = devm_reset_control_get_exclusive(dev, "phy_ahb");
if (IS_ERR(res->phy_ahb_reset))
return PTR_ERR(res->phy_ahb_reset);
if (is_ipq) {
res->phy_ahb_reset = devm_reset_control_get_exclusive(dev, "phy_ahb");
if (IS_ERR(res->phy_ahb_reset))
return PTR_ERR(res->phy_ahb_reset);
}
return 0;
}
@ -719,9 +731,7 @@ static void qcom_pcie_deinit_2_4_0(struct qcom_pcie *pcie)
reset_control_assert(res->axi_m_sticky_reset);
reset_control_assert(res->pwr_reset);
reset_control_assert(res->ahb_reset);
clk_disable_unprepare(res->aux_clk);
clk_disable_unprepare(res->master_clk);
clk_disable_unprepare(res->slave_clk);
clk_bulk_disable_unprepare(res->num_clks, res->clks);
}
static int qcom_pcie_init_2_4_0(struct qcom_pcie *pcie)
@ -850,23 +860,9 @@ static int qcom_pcie_init_2_4_0(struct qcom_pcie *pcie)
usleep_range(10000, 12000);
ret = clk_prepare_enable(res->aux_clk);
if (ret) {
dev_err(dev, "cannot prepare/enable iface clock\n");
goto err_clk_aux;
}
ret = clk_prepare_enable(res->master_clk);
if (ret) {
dev_err(dev, "cannot prepare/enable core clock\n");
goto err_clk_axi_m;
}
ret = clk_prepare_enable(res->slave_clk);
if (ret) {
dev_err(dev, "cannot prepare/enable phy clock\n");
goto err_clk_axi_s;
}
ret = clk_bulk_prepare_enable(res->num_clks, res->clks);
if (ret)
goto err_clks;
/* enable PCIe clocks and resets */
val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL);
@ -891,11 +887,7 @@ static int qcom_pcie_init_2_4_0(struct qcom_pcie *pcie)
return 0;
err_clk_axi_s:
clk_disable_unprepare(res->master_clk);
err_clk_axi_m:
clk_disable_unprepare(res->aux_clk);
err_clk_aux:
err_clks:
reset_control_assert(res->ahb_reset);
err_rst_ahb:
reset_control_assert(res->pwr_reset);
@ -1289,6 +1281,7 @@ static const struct of_device_id qcom_pcie_match[] = {
{ .compatible = "qcom,pcie-msm8996", .data = &ops_2_3_2 },
{ .compatible = "qcom,pcie-ipq8074", .data = &ops_2_3_3 },
{ .compatible = "qcom,pcie-ipq4019", .data = &ops_2_4_0 },
{ .compatible = "qcom,pcie-qcs404", .data = &ops_2_4_0 },
{ }
};