From: Bjorn Helgaas <helgaas@kernel.org>
To: Christoph Fritz <chf.fritz@googlemail.com>
Cc: Richard Zhu <hongxing.zhu@nxp.com>,
Lucas Stach <l.stach@pengutronix.de>,
Shawn Guo <shawnguo@kernel.org>,
Fabio Estevam <fabio.estevam@nxp.com>,
Bjorn Helgaas <bhelgaas@google.com>,
Lee Jones <lee.jones@linaro.org>,
linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v3 2/2] PCI: imx6: add initial imx6sx support
Date: Fri, 11 Mar 2016 11:58:50 -0600 [thread overview]
Message-ID: <20160311175850.GA4725@localhost> (raw)
In-Reply-To: <1456411669-4699-3-git-send-email-chf.fritz@googlemail.com>
Hi Christoph (and Lee; there's a question for you below, too),
On Thu, Feb 25, 2016 at 03:47:49PM +0100, Christoph Fritz wrote:
> This patch adds initial PCIe support for the imx6 SoC derivate imx6sx.
> PCI_MSI support is untested as its necessary suspend/resume quirk is
> left out of this patch.
> This patch is heavily based on patches by Richard Zhu.
>
> Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
> ---
> .../devicetree/bindings/pci/fsl,imx6q-pcie.txt | 6 +-
> drivers/pci/host/pci-imx6.c | 130 ++++++++++++++-------
> 2 files changed, 96 insertions(+), 40 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> index 6fbba53..c4323be 100644
> --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> @@ -4,7 +4,7 @@ This PCIe host controller is based on the Synopsis Designware PCIe IP
> and thus inherits all the common properties defined in designware-pcie.txt.
>
> Required properties:
> -- compatible: "fsl,imx6q-pcie"
> +- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie"
> - reg: base addresse and length of the pcie controller
I folded in a typo fix for "addresse".
> - interrupts: A list of interrupt outputs of the controller. Must contain an
> entry for each entry in the interrupt-names property.
> @@ -13,6 +13,10 @@ Required properties:
> - clock-names: Must include the following additional entries:
> - "pcie_phy"
>
> +Additional required properties for imx6sx-pcie:
> +- clock names: Must include the following additional entries:
> + - "pcie_inbound_axi"
> +
> Example:
>
> pcie@0x01000000 {
> diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
> index fe60096..7e634a6 100644
> --- a/drivers/pci/host/pci-imx6.c
> +++ b/drivers/pci/host/pci-imx6.c
> @@ -35,9 +35,11 @@ struct imx6_pcie {
> struct gpio_desc *reset_gpio;
> struct clk *pcie_bus;
> struct clk *pcie_phy;
> + struct clk *pcie_inbound_axi;
> struct clk *pcie;
> struct pcie_port pp;
> struct regmap *iomuxc_gpr;
> + bool is_imx6sx;
> void __iomem *mem_base;
> };
>
> @@ -214,35 +216,46 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
> struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
> u32 val, gpr1, gpr12;
>
> - /*
> - * If the bootloader already enabled the link we need some special
> - * handling to get the core back into a state where it is safe to
> - * touch it for configuration. As there is no dedicated reset signal
> - * wired up for MX6QDL, we need to manually force LTSSM into "detect"
> - * state before completely disabling LTSSM, which is a prerequisite
> - * for core configuration.
> - *
> - * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have a strong
> - * indication that the bootloader activated the link.
> - */
> - regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, &gpr1);
> - regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, &gpr12);
> -
> - if ((gpr1 & IMX6Q_GPR1_PCIE_REF_CLK_EN) &&
> - (gpr12 & IMX6Q_GPR12_PCIE_CTL_2)) {
> - val = readl(pp->dbi_base + PCIE_PL_PFLR);
> - val &= ~PCIE_PL_PFLR_LINK_STATE_MASK;
> - val |= PCIE_PL_PFLR_FORCE_LINK;
> - writel(val, pp->dbi_base + PCIE_PL_PFLR);
> -
> + if (imx6_pcie->is_imx6sx) {
> regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> - IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
> - }
> + IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
> + IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
> + /* Force PCIe PHY reset */
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
> + IMX6SX_GPR5_PCIE_BTNRST_RESET,
> + IMX6SX_GPR5_PCIE_BTNRST_RESET);
Since there's nothing after the "else" clause, I think it's better to
return immediately here. Then we don't have extra diffs that merely
indent the original function. I did make this change (I'll attach my
resulting patch), and that made some other changes to the indented
code more visible.
> + } else {
> + /*
> + * If the bootloader already enabled the link we need some
> + * special handling to get the core back into a state where
> + * it is safe to touch it for configuration. As there is no
> + * dedicated reset signal to manually force LTSSM into "detect"
> + * state before completely disabling LTSSM, which is a
> + * prerequisite for core configuration.
For example, you changed this comment, and now the last sentence is no
longer a sentence. I don't know if this was an editing mistake or if
this comment really does need to change. If it does need to change,
it needs to stay a sentence.
> + * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have
> + * a strong indication that the bootloader activated the link.
> + */
> + regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, &gpr1);
> + regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, &gpr12);
> +
> + if ((gpr1 & IMX6Q_GPR1_PCIE_REF_CLK_EN) &&
> + (gpr12 & IMX6Q_GPR12_PCIE_CTL_2)) {
> + val = readl(pp->dbi_base + PCIE_PL_PFLR);
> + val &= ~PCIE_PL_PFLR_LINK_STATE_MASK;
> + val |= PCIE_PL_PFLR_FORCE_LINK;
> + writel(val, pp->dbi_base + PCIE_PL_PFLR);
> +
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> + IMX6Q_GPR12_PCIE_CTL_2, 0);
> + }
>
> - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> - IMX6Q_GPR1_PCIE_TEST_PD, 1 << 18);
> - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> - IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16);
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> + IMX6Q_GPR1_PCIE_TEST_PD,
> + IMX6Q_GPR1_PCIE_TEST_PD);
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> + IMX6Q_GPR1_PCIE_REF_CLK_EN, 0);
And there are subtle changes here (changing "1 << 18" to
IMX6Q_GPR1_PCIE_TEST_PD, etc.) These are fine, but should be in a
separate patch because (a) they're not related to imx6sx and (b) it
makes them obvious and easy to review. As it is, they just get snuck
in under the radar.
> + }
>
> return 0;
> }
> @@ -270,18 +283,30 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
> goto err_pcie;
> }
>
> - /* power up core phy and enable ref clock */
> - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> - IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
> - /*
> - * the async reset input need ref clock to sync internally,
> - * when the ref clock comes after reset, internal synced
> - * reset time is too short, cannot meet the requirement.
> - * add one ~10us delay here.
> - */
> - udelay(10);
> - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> - IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
> + if (imx6_pcie->is_imx6sx) {
> + ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
> + if (ret) {
> + dev_err(pp->dev, "unable to enable pcie_axi clock\n");
> + goto err_inbound_axi;
> + }
> +
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> + IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
> + } else {
> + /* power up core phy and enable ref clock */
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> + IMX6Q_GPR1_PCIE_TEST_PD, 0);
> + /*
> + * the async reset input need ref clock to sync internally,
> + * when the ref clock comes after reset, internal synced
> + * reset time is too short , cannot meet the requirement.
> + * add one ~10us delay here.
> + */
> + udelay(10);
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> + IMX6Q_GPR1_PCIE_REF_CLK_EN,
> + IMX6Q_GPR1_PCIE_REF_CLK_EN);
> + }
Here again the diff is bigger than necessary because it re-indents the
original code (and makes another unrelated "1 << 16" to
IMX6Q_GPR1_PCIE_REF_CLK_EN change). I'll show a different proposal in
my patch below.
> /* allow the clocks to stabilize */
> usleep_range(200, 500);
> @@ -292,8 +317,15 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
> msleep(100);
> gpiod_set_value_cansleep(imx6_pcie->reset_gpio, 1);
> }
> +
> + if (imx6_pcie->is_imx6sx)
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
> + IMX6SX_GPR5_PCIE_BTNRST_RESET, 0);
> +
> return 0;
>
> +err_inbound_axi:
> + clk_disable_unprepare(imx6_pcie->pcie);
> err_pcie:
> clk_disable_unprepare(imx6_pcie->pcie_bus);
> err_pcie_bus:
> @@ -307,6 +339,12 @@ static void imx6_pcie_init_phy(struct pcie_port *pp)
> {
> struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
>
> + if (imx6_pcie->is_imx6sx) {
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> + IMX6SX_GPR12_PCIE_RX_EQ_MASK,
> + IMX6SX_GPR12_PCIE_RX_EQ_2);
I see that you added definitions for IMX6SX_GPR12_PCIE_RX_EQ_MASK and
IMX6SX_GPR12_PCIE_RX_EQ_2 in the first patch of this series, but doing
that separately creates a merge problem. I can't put this change in
my tree by itself because it won't build. If Lee applied the first
patch to a git branch, I guess I could pull that into my tree. But it
would be far simpler to just include those new definitions in this
patch.
> + }
> +
> regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
>
> @@ -571,6 +609,9 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
> pp = &imx6_pcie->pp;
> pp->dev = &pdev->dev;
>
> + imx6_pcie->is_imx6sx = of_device_is_compatible(pp->dev->of_node,
> + "fsl,imx6sx-pcie");
> +
> /* Added for PCI abort handling */
> hook_fault_code(16 + 6, imx6q_pcie_abort_handler, SIGBUS, 0,
> "imprecise external abort");
> @@ -606,6 +647,16 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
> return PTR_ERR(imx6_pcie->pcie);
> }
>
> + if (imx6_pcie->is_imx6sx) {
> + imx6_pcie->pcie_inbound_axi = devm_clk_get(&pdev->dev,
> + "pcie_inbound_axi");
> + if (IS_ERR(imx6_pcie->pcie_inbound_axi)) {
> + dev_err(&pdev->dev,
> + "pcie_incbound_axi clock missing or invalid\n");
> + return PTR_ERR(imx6_pcie->pcie_inbound_axi);
> + }
> + }
> +
> /* Grab GPR config register range */
> imx6_pcie->iomuxc_gpr =
> syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
> @@ -632,6 +683,7 @@ static void imx6_pcie_shutdown(struct platform_device *pdev)
>
> static const struct of_device_id imx6_pcie_of_match[] = {
> { .compatible = "fsl,imx6q-pcie", },
> + { .compatible = "fsl,imx6sx-pcie", },
> {},
> };
> MODULE_DEVICE_TABLE(of, imx6_pcie_of_match);
The patches below are what I currently have in my tree, but they're
not ready for v4.6 (yet).
Note that the second one is very clearly imx6sx-only. It's obvious
there are no tweaks to the existing imx6 code, which makes it easier
to review, backport, bisect, revert, etc.
Obviously, I can't apply these directly. First we have to:
- Fix the LTSSM comment
- Figure out how to get the IMX6SX_GPR12_PCIE_RX_EQ_MASK definitions
commit 78abf60b815a8f28207d029d61f7809647faa43a
Author: Bjorn Helgaas <bhelgaas@google.com>
Date: Fri Mar 11 11:15:36 2016 -0600
PCI: imx6: Factor out ref clock enable
Factor out ref clock enable to make it cleaner to add imx6sx support. No
functional change intended.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
index 8c9b389..ecc8537 100644
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -269,6 +269,23 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
return 0;
}
+static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
+{
+ /* power up core phy and enable ref clock */
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
+ IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
+ /*
+ * the async reset input need ref clock to sync internally,
+ * when the ref clock comes after reset, internal synced
+ * reset time is too short, cannot meet the requirement.
+ * add one ~10us delay here.
+ */
+ udelay(10);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
+ IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
+ return 0;
+}
+
static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
{
struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
@@ -292,18 +309,11 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
goto err_pcie;
}
- /* power up core phy and enable ref clock */
- regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
- IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
- /*
- * the async reset input need ref clock to sync internally,
- * when the ref clock comes after reset, internal synced
- * reset time is too short, cannot meet the requirement.
- * add one ~10us delay here.
- */
- udelay(10);
- regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
- IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
+ ret = imx6_pcie_enable_ref_clk(imx6_pcie);
+ if (ret)
+ dev_err(pp->dev, "unable to enable pcie ref clock\n");
+ goto err_ref_clk;
+ }
/* allow the clocks to stabilize */
usleep_range(200, 500);
@@ -316,6 +326,8 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
}
return 0;
+err_ref_clk:
+ clk_disable_unprepare(imx6_pcie->pcie);
err_pcie:
clk_disable_unprepare(imx6_pcie->pcie_bus);
err_pcie_bus:
commit d061033570b7fd22a3ed8c029d4793e5df7324e1
Author: Christoph Fritz <chf.fritz@googlemail.com>
Date: Thu Mar 10 15:04:25 2016 -0600
PCI: imx6: Add initial imx6sx support
Add initial PCIe support for the imx6 SoC derivate imx6sx. PCI MSI support
is untested as the necessary suspend/resume quirk is not included in this
patch.
This patch is heavily based on patches by Richard Zhu.
[bhelgaas: factor out refclk enable, fix adjacent typos in fsl,imx6q-pcie.txt]
Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
Acked-by: Richard Zhu <Richard.Zhu@freescale.com>
Acked-by: Lucas Stach <l.stach@pengutronix.de>
diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
index 3be80c6..0561e88 100644
--- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
@@ -4,8 +4,8 @@ This PCIe host controller is based on the Synopsis Designware PCIe IP
and thus inherits all the common properties defined in designware-pcie.txt.
Required properties:
-- compatible: "fsl,imx6q-pcie"
-- reg: base addresse and length of the pcie controller
+- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie"
+- reg: base address and length of the PCIe controller
- interrupts: A list of interrupt outputs of the controller. Must contain an
entry for each entry in the interrupt-names property.
- interrupt-names: Must include the following entries:
@@ -20,6 +20,10 @@ Optional properties:
- fsl,tx-swing-full: Gen2 TX SWING FULL value. Default: 127
- fsl,tx-swing-low: TX launch amplitude swing_low value. Default: 127
+Additional required properties for imx6sx-pcie:
+- clock names: Must include the following additional entries:
+ - "pcie_inbound_axi"
+
Example:
pcie@0x01000000 {
diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
index ecc8537..4d6af21 100644
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -35,9 +35,11 @@ struct imx6_pcie {
struct gpio_desc *reset_gpio;
struct clk *pcie_bus;
struct clk *pcie_phy;
+ struct clk *pcie_inbound_axi;
struct clk *pcie;
struct pcie_port pp;
struct regmap *iomuxc_gpr;
+ bool is_imx6sx;
void __iomem *mem_base;
u32 tx_deemph_gen1;
u32 tx_deemph_gen2_3p5db;
@@ -236,13 +238,23 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
u32 val, gpr1, gpr12;
+ if (imx6_pcie->is_imx6sx) {
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+ IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
+ IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
+ /* Force PCIe PHY reset */
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
+ IMX6SX_GPR5_PCIE_BTNRST_RESET,
+ IMX6SX_GPR5_PCIE_BTNRST_RESET);
+ return 0;
+ }
+
/*
* If the bootloader already enabled the link we need some special
* handling to get the core back into a state where it is safe to
* touch it for configuration. As there is no dedicated reset signal
- * wired up for MX6QDL, we need to manually force LTSSM into "detect"
- * state before completely disabling LTSSM, which is a prerequisite
- * for core configuration.
+ * to manually force LTSSM into "detect" state before completely
+ * disabling LTSSM, which is a prerequisite for core configuration.
*
* If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have a strong
* indication that the bootloader activated the link.
@@ -271,6 +283,18 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
{
+ if (imx6_pcie->is_imx6sx) {
+ ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
+ if (ret) {
+ dev_err(pp->dev, "unable to enable pcie_axi clock\n");
+ return ret;
+ }
+
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+ IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
+ return 0;
+ }
+
/* power up core phy and enable ref clock */
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
@@ -324,6 +348,11 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
msleep(100);
gpiod_set_value_cansleep(imx6_pcie->reset_gpio, 1);
}
+
+ if (imx6_pcie->is_imx6sx)
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
+ IMX6SX_GPR5_PCIE_BTNRST_RESET, 0);
+
return 0;
err_ref_clk:
@@ -341,6 +370,12 @@ static void imx6_pcie_init_phy(struct pcie_port *pp)
{
struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
+ if (imx6_pcie->is_imx6sx) {
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+ IMX6SX_GPR12_PCIE_RX_EQ_MASK,
+ IMX6SX_GPR12_PCIE_RX_EQ_2);
+ }
+
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
@@ -565,6 +600,9 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
pp = &imx6_pcie->pp;
pp->dev = &pdev->dev;
+ imx6_pcie->is_imx6sx = of_device_is_compatible(pp->dev->of_node,
+ "fsl,imx6sx-pcie");
+
/* Added for PCI abort handling */
hook_fault_code(16 + 6, imx6q_pcie_abort_handler, SIGBUS, 0,
"imprecise external abort");
@@ -600,6 +638,16 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
return PTR_ERR(imx6_pcie->pcie);
}
+ if (imx6_pcie->is_imx6sx) {
+ imx6_pcie->pcie_inbound_axi = devm_clk_get(&pdev->dev,
+ "pcie_inbound_axi");
+ if (IS_ERR(imx6_pcie->pcie_inbound_axi)) {
+ dev_err(&pdev->dev,
+ "pcie_incbound_axi clock missing or invalid\n");
+ return PTR_ERR(imx6_pcie->pcie_inbound_axi);
+ }
+ }
+
/* Grab GPR config register range */
imx6_pcie->iomuxc_gpr =
syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
@@ -647,6 +695,7 @@ static void imx6_pcie_shutdown(struct platform_device *pdev)
static const struct of_device_id imx6_pcie_of_match[] = {
{ .compatible = "fsl,imx6q-pcie", },
+ { .compatible = "fsl,imx6sx-pcie", },
{},
};
MODULE_DEVICE_TABLE(of, imx6_pcie_of_match);
WARNING: multiple messages have this Message-ID (diff)
From: helgaas@kernel.org (Bjorn Helgaas)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 2/2] PCI: imx6: add initial imx6sx support
Date: Fri, 11 Mar 2016 11:58:50 -0600 [thread overview]
Message-ID: <20160311175850.GA4725@localhost> (raw)
In-Reply-To: <1456411669-4699-3-git-send-email-chf.fritz@googlemail.com>
Hi Christoph (and Lee; there's a question for you below, too),
On Thu, Feb 25, 2016 at 03:47:49PM +0100, Christoph Fritz wrote:
> This patch adds initial PCIe support for the imx6 SoC derivate imx6sx.
> PCI_MSI support is untested as its necessary suspend/resume quirk is
> left out of this patch.
> This patch is heavily based on patches by Richard Zhu.
>
> Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
> ---
> .../devicetree/bindings/pci/fsl,imx6q-pcie.txt | 6 +-
> drivers/pci/host/pci-imx6.c | 130 ++++++++++++++-------
> 2 files changed, 96 insertions(+), 40 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> index 6fbba53..c4323be 100644
> --- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> +++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
> @@ -4,7 +4,7 @@ This PCIe host controller is based on the Synopsis Designware PCIe IP
> and thus inherits all the common properties defined in designware-pcie.txt.
>
> Required properties:
> -- compatible: "fsl,imx6q-pcie"
> +- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie"
> - reg: base addresse and length of the pcie controller
I folded in a typo fix for "addresse".
> - interrupts: A list of interrupt outputs of the controller. Must contain an
> entry for each entry in the interrupt-names property.
> @@ -13,6 +13,10 @@ Required properties:
> - clock-names: Must include the following additional entries:
> - "pcie_phy"
>
> +Additional required properties for imx6sx-pcie:
> +- clock names: Must include the following additional entries:
> + - "pcie_inbound_axi"
> +
> Example:
>
> pcie at 0x01000000 {
> diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
> index fe60096..7e634a6 100644
> --- a/drivers/pci/host/pci-imx6.c
> +++ b/drivers/pci/host/pci-imx6.c
> @@ -35,9 +35,11 @@ struct imx6_pcie {
> struct gpio_desc *reset_gpio;
> struct clk *pcie_bus;
> struct clk *pcie_phy;
> + struct clk *pcie_inbound_axi;
> struct clk *pcie;
> struct pcie_port pp;
> struct regmap *iomuxc_gpr;
> + bool is_imx6sx;
> void __iomem *mem_base;
> };
>
> @@ -214,35 +216,46 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
> struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
> u32 val, gpr1, gpr12;
>
> - /*
> - * If the bootloader already enabled the link we need some special
> - * handling to get the core back into a state where it is safe to
> - * touch it for configuration. As there is no dedicated reset signal
> - * wired up for MX6QDL, we need to manually force LTSSM into "detect"
> - * state before completely disabling LTSSM, which is a prerequisite
> - * for core configuration.
> - *
> - * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have a strong
> - * indication that the bootloader activated the link.
> - */
> - regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, &gpr1);
> - regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, &gpr12);
> -
> - if ((gpr1 & IMX6Q_GPR1_PCIE_REF_CLK_EN) &&
> - (gpr12 & IMX6Q_GPR12_PCIE_CTL_2)) {
> - val = readl(pp->dbi_base + PCIE_PL_PFLR);
> - val &= ~PCIE_PL_PFLR_LINK_STATE_MASK;
> - val |= PCIE_PL_PFLR_FORCE_LINK;
> - writel(val, pp->dbi_base + PCIE_PL_PFLR);
> -
> + if (imx6_pcie->is_imx6sx) {
> regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> - IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
> - }
> + IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
> + IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
> + /* Force PCIe PHY reset */
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
> + IMX6SX_GPR5_PCIE_BTNRST_RESET,
> + IMX6SX_GPR5_PCIE_BTNRST_RESET);
Since there's nothing after the "else" clause, I think it's better to
return immediately here. Then we don't have extra diffs that merely
indent the original function. I did make this change (I'll attach my
resulting patch), and that made some other changes to the indented
code more visible.
> + } else {
> + /*
> + * If the bootloader already enabled the link we need some
> + * special handling to get the core back into a state where
> + * it is safe to touch it for configuration. As there is no
> + * dedicated reset signal to manually force LTSSM into "detect"
> + * state before completely disabling LTSSM, which is a
> + * prerequisite for core configuration.
For example, you changed this comment, and now the last sentence is no
longer a sentence. I don't know if this was an editing mistake or if
this comment really does need to change. If it does need to change,
it needs to stay a sentence.
> + * If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have
> + * a strong indication that the bootloader activated the link.
> + */
> + regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1, &gpr1);
> + regmap_read(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, &gpr12);
> +
> + if ((gpr1 & IMX6Q_GPR1_PCIE_REF_CLK_EN) &&
> + (gpr12 & IMX6Q_GPR12_PCIE_CTL_2)) {
> + val = readl(pp->dbi_base + PCIE_PL_PFLR);
> + val &= ~PCIE_PL_PFLR_LINK_STATE_MASK;
> + val |= PCIE_PL_PFLR_FORCE_LINK;
> + writel(val, pp->dbi_base + PCIE_PL_PFLR);
> +
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> + IMX6Q_GPR12_PCIE_CTL_2, 0);
> + }
>
> - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> - IMX6Q_GPR1_PCIE_TEST_PD, 1 << 18);
> - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> - IMX6Q_GPR1_PCIE_REF_CLK_EN, 0 << 16);
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> + IMX6Q_GPR1_PCIE_TEST_PD,
> + IMX6Q_GPR1_PCIE_TEST_PD);
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> + IMX6Q_GPR1_PCIE_REF_CLK_EN, 0);
And there are subtle changes here (changing "1 << 18" to
IMX6Q_GPR1_PCIE_TEST_PD, etc.) These are fine, but should be in a
separate patch because (a) they're not related to imx6sx and (b) it
makes them obvious and easy to review. As it is, they just get snuck
in under the radar.
> + }
>
> return 0;
> }
> @@ -270,18 +283,30 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
> goto err_pcie;
> }
>
> - /* power up core phy and enable ref clock */
> - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> - IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
> - /*
> - * the async reset input need ref clock to sync internally,
> - * when the ref clock comes after reset, internal synced
> - * reset time is too short, cannot meet the requirement.
> - * add one ~10us delay here.
> - */
> - udelay(10);
> - regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> - IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
> + if (imx6_pcie->is_imx6sx) {
> + ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
> + if (ret) {
> + dev_err(pp->dev, "unable to enable pcie_axi clock\n");
> + goto err_inbound_axi;
> + }
> +
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> + IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
> + } else {
> + /* power up core phy and enable ref clock */
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> + IMX6Q_GPR1_PCIE_TEST_PD, 0);
> + /*
> + * the async reset input need ref clock to sync internally,
> + * when the ref clock comes after reset, internal synced
> + * reset time is too short , cannot meet the requirement.
> + * add one ~10us delay here.
> + */
> + udelay(10);
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
> + IMX6Q_GPR1_PCIE_REF_CLK_EN,
> + IMX6Q_GPR1_PCIE_REF_CLK_EN);
> + }
Here again the diff is bigger than necessary because it re-indents the
original code (and makes another unrelated "1 << 16" to
IMX6Q_GPR1_PCIE_REF_CLK_EN change). I'll show a different proposal in
my patch below.
> /* allow the clocks to stabilize */
> usleep_range(200, 500);
> @@ -292,8 +317,15 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
> msleep(100);
> gpiod_set_value_cansleep(imx6_pcie->reset_gpio, 1);
> }
> +
> + if (imx6_pcie->is_imx6sx)
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
> + IMX6SX_GPR5_PCIE_BTNRST_RESET, 0);
> +
> return 0;
>
> +err_inbound_axi:
> + clk_disable_unprepare(imx6_pcie->pcie);
> err_pcie:
> clk_disable_unprepare(imx6_pcie->pcie_bus);
> err_pcie_bus:
> @@ -307,6 +339,12 @@ static void imx6_pcie_init_phy(struct pcie_port *pp)
> {
> struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
>
> + if (imx6_pcie->is_imx6sx) {
> + regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> + IMX6SX_GPR12_PCIE_RX_EQ_MASK,
> + IMX6SX_GPR12_PCIE_RX_EQ_2);
I see that you added definitions for IMX6SX_GPR12_PCIE_RX_EQ_MASK and
IMX6SX_GPR12_PCIE_RX_EQ_2 in the first patch of this series, but doing
that separately creates a merge problem. I can't put this change in
my tree by itself because it won't build. If Lee applied the first
patch to a git branch, I guess I could pull that into my tree. But it
would be far simpler to just include those new definitions in this
patch.
> + }
> +
> regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
>
> @@ -571,6 +609,9 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
> pp = &imx6_pcie->pp;
> pp->dev = &pdev->dev;
>
> + imx6_pcie->is_imx6sx = of_device_is_compatible(pp->dev->of_node,
> + "fsl,imx6sx-pcie");
> +
> /* Added for PCI abort handling */
> hook_fault_code(16 + 6, imx6q_pcie_abort_handler, SIGBUS, 0,
> "imprecise external abort");
> @@ -606,6 +647,16 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
> return PTR_ERR(imx6_pcie->pcie);
> }
>
> + if (imx6_pcie->is_imx6sx) {
> + imx6_pcie->pcie_inbound_axi = devm_clk_get(&pdev->dev,
> + "pcie_inbound_axi");
> + if (IS_ERR(imx6_pcie->pcie_inbound_axi)) {
> + dev_err(&pdev->dev,
> + "pcie_incbound_axi clock missing or invalid\n");
> + return PTR_ERR(imx6_pcie->pcie_inbound_axi);
> + }
> + }
> +
> /* Grab GPR config register range */
> imx6_pcie->iomuxc_gpr =
> syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
> @@ -632,6 +683,7 @@ static void imx6_pcie_shutdown(struct platform_device *pdev)
>
> static const struct of_device_id imx6_pcie_of_match[] = {
> { .compatible = "fsl,imx6q-pcie", },
> + { .compatible = "fsl,imx6sx-pcie", },
> {},
> };
> MODULE_DEVICE_TABLE(of, imx6_pcie_of_match);
The patches below are what I currently have in my tree, but they're
not ready for v4.6 (yet).
Note that the second one is very clearly imx6sx-only. It's obvious
there are no tweaks to the existing imx6 code, which makes it easier
to review, backport, bisect, revert, etc.
Obviously, I can't apply these directly. First we have to:
- Fix the LTSSM comment
- Figure out how to get the IMX6SX_GPR12_PCIE_RX_EQ_MASK definitions
commit 78abf60b815a8f28207d029d61f7809647faa43a
Author: Bjorn Helgaas <bhelgaas@google.com>
Date: Fri Mar 11 11:15:36 2016 -0600
PCI: imx6: Factor out ref clock enable
Factor out ref clock enable to make it cleaner to add imx6sx support. No
functional change intended.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
index 8c9b389..ecc8537 100644
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -269,6 +269,23 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
return 0;
}
+static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
+{
+ /* power up core phy and enable ref clock */
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
+ IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
+ /*
+ * the async reset input need ref clock to sync internally,
+ * when the ref clock comes after reset, internal synced
+ * reset time is too short, cannot meet the requirement.
+ * add one ~10us delay here.
+ */
+ udelay(10);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
+ IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
+ return 0;
+}
+
static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
{
struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
@@ -292,18 +309,11 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
goto err_pcie;
}
- /* power up core phy and enable ref clock */
- regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
- IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
- /*
- * the async reset input need ref clock to sync internally,
- * when the ref clock comes after reset, internal synced
- * reset time is too short, cannot meet the requirement.
- * add one ~10us delay here.
- */
- udelay(10);
- regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
- IMX6Q_GPR1_PCIE_REF_CLK_EN, 1 << 16);
+ ret = imx6_pcie_enable_ref_clk(imx6_pcie);
+ if (ret)
+ dev_err(pp->dev, "unable to enable pcie ref clock\n");
+ goto err_ref_clk;
+ }
/* allow the clocks to stabilize */
usleep_range(200, 500);
@@ -316,6 +326,8 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
}
return 0;
+err_ref_clk:
+ clk_disable_unprepare(imx6_pcie->pcie);
err_pcie:
clk_disable_unprepare(imx6_pcie->pcie_bus);
err_pcie_bus:
commit d061033570b7fd22a3ed8c029d4793e5df7324e1
Author: Christoph Fritz <chf.fritz@googlemail.com>
Date: Thu Mar 10 15:04:25 2016 -0600
PCI: imx6: Add initial imx6sx support
Add initial PCIe support for the imx6 SoC derivate imx6sx. PCI MSI support
is untested as the necessary suspend/resume quirk is not included in this
patch.
This patch is heavily based on patches by Richard Zhu.
[bhelgaas: factor out refclk enable, fix adjacent typos in fsl,imx6q-pcie.txt]
Signed-off-by: Christoph Fritz <chf.fritz@googlemail.com>
Acked-by: Richard Zhu <Richard.Zhu@freescale.com>
Acked-by: Lucas Stach <l.stach@pengutronix.de>
diff --git a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
index 3be80c6..0561e88 100644
--- a/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
+++ b/Documentation/devicetree/bindings/pci/fsl,imx6q-pcie.txt
@@ -4,8 +4,8 @@ This PCIe host controller is based on the Synopsis Designware PCIe IP
and thus inherits all the common properties defined in designware-pcie.txt.
Required properties:
-- compatible: "fsl,imx6q-pcie"
-- reg: base addresse and length of the pcie controller
+- compatible: "fsl,imx6q-pcie", "fsl,imx6sx-pcie"
+- reg: base address and length of the PCIe controller
- interrupts: A list of interrupt outputs of the controller. Must contain an
entry for each entry in the interrupt-names property.
- interrupt-names: Must include the following entries:
@@ -20,6 +20,10 @@ Optional properties:
- fsl,tx-swing-full: Gen2 TX SWING FULL value. Default: 127
- fsl,tx-swing-low: TX launch amplitude swing_low value. Default: 127
+Additional required properties for imx6sx-pcie:
+- clock names: Must include the following additional entries:
+ - "pcie_inbound_axi"
+
Example:
pcie at 0x01000000 {
diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
index ecc8537..4d6af21 100644
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -35,9 +35,11 @@ struct imx6_pcie {
struct gpio_desc *reset_gpio;
struct clk *pcie_bus;
struct clk *pcie_phy;
+ struct clk *pcie_inbound_axi;
struct clk *pcie;
struct pcie_port pp;
struct regmap *iomuxc_gpr;
+ bool is_imx6sx;
void __iomem *mem_base;
u32 tx_deemph_gen1;
u32 tx_deemph_gen2_3p5db;
@@ -236,13 +238,23 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
u32 val, gpr1, gpr12;
+ if (imx6_pcie->is_imx6sx) {
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+ IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
+ IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
+ /* Force PCIe PHY reset */
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
+ IMX6SX_GPR5_PCIE_BTNRST_RESET,
+ IMX6SX_GPR5_PCIE_BTNRST_RESET);
+ return 0;
+ }
+
/*
* If the bootloader already enabled the link we need some special
* handling to get the core back into a state where it is safe to
* touch it for configuration. As there is no dedicated reset signal
- * wired up for MX6QDL, we need to manually force LTSSM into "detect"
- * state before completely disabling LTSSM, which is a prerequisite
- * for core configuration.
+ * to manually force LTSSM into "detect" state before completely
+ * disabling LTSSM, which is a prerequisite for core configuration.
*
* If both LTSSM_ENABLE and REF_SSP_ENABLE are active we have a strong
* indication that the bootloader activated the link.
@@ -271,6 +283,18 @@ static int imx6_pcie_assert_core_reset(struct pcie_port *pp)
static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
{
+ if (imx6_pcie->is_imx6sx) {
+ ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
+ if (ret) {
+ dev_err(pp->dev, "unable to enable pcie_axi clock\n");
+ return ret;
+ }
+
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+ IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
+ return 0;
+ }
+
/* power up core phy and enable ref clock */
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR1,
IMX6Q_GPR1_PCIE_TEST_PD, 0 << 18);
@@ -324,6 +348,11 @@ static int imx6_pcie_deassert_core_reset(struct pcie_port *pp)
msleep(100);
gpiod_set_value_cansleep(imx6_pcie->reset_gpio, 1);
}
+
+ if (imx6_pcie->is_imx6sx)
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
+ IMX6SX_GPR5_PCIE_BTNRST_RESET, 0);
+
return 0;
err_ref_clk:
@@ -341,6 +370,12 @@ static void imx6_pcie_init_phy(struct pcie_port *pp)
{
struct imx6_pcie *imx6_pcie = to_imx6_pcie(pp);
+ if (imx6_pcie->is_imx6sx) {
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+ IMX6SX_GPR12_PCIE_RX_EQ_MASK,
+ IMX6SX_GPR12_PCIE_RX_EQ_2);
+ }
+
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
@@ -565,6 +600,9 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
pp = &imx6_pcie->pp;
pp->dev = &pdev->dev;
+ imx6_pcie->is_imx6sx = of_device_is_compatible(pp->dev->of_node,
+ "fsl,imx6sx-pcie");
+
/* Added for PCI abort handling */
hook_fault_code(16 + 6, imx6q_pcie_abort_handler, SIGBUS, 0,
"imprecise external abort");
@@ -600,6 +638,16 @@ static int __init imx6_pcie_probe(struct platform_device *pdev)
return PTR_ERR(imx6_pcie->pcie);
}
+ if (imx6_pcie->is_imx6sx) {
+ imx6_pcie->pcie_inbound_axi = devm_clk_get(&pdev->dev,
+ "pcie_inbound_axi");
+ if (IS_ERR(imx6_pcie->pcie_inbound_axi)) {
+ dev_err(&pdev->dev,
+ "pcie_incbound_axi clock missing or invalid\n");
+ return PTR_ERR(imx6_pcie->pcie_inbound_axi);
+ }
+ }
+
/* Grab GPR config register range */
imx6_pcie->iomuxc_gpr =
syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
@@ -647,6 +695,7 @@ static void imx6_pcie_shutdown(struct platform_device *pdev)
static const struct of_device_id imx6_pcie_of_match[] = {
{ .compatible = "fsl,imx6q-pcie", },
+ { .compatible = "fsl,imx6sx-pcie", },
{},
};
MODULE_DEVICE_TABLE(of, imx6_pcie_of_match);
next prev parent reply other threads:[~2016-03-11 17:59 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-25 14:47 [PATCH v3 0/2] Add PCIe driver support for imx6sx Christoph Fritz
2016-02-25 14:47 ` Christoph Fritz
2016-02-25 14:47 ` [PATCH v3 1/2] MFD: imx6sx: Add PCIe register definitions for iomuxc gpr Christoph Fritz
2016-02-25 14:47 ` Christoph Fritz
2016-03-08 4:32 ` Lee Jones
2016-03-08 4:32 ` Lee Jones
2016-02-25 14:47 ` [PATCH v3 2/2] PCI: imx6: add initial imx6sx support Christoph Fritz
2016-02-25 14:47 ` Christoph Fritz
2016-03-11 17:58 ` Bjorn Helgaas [this message]
2016-03-11 17:58 ` Bjorn Helgaas
2016-03-13 23:26 ` Christoph Fritz
2016-03-13 23:26 ` Christoph Fritz
2016-03-13 23:30 ` PCI: imx6: Factor out ref clock enable Christoph Fritz
2016-03-20 7:29 ` Christoph Fritz
2016-03-20 7:29 ` Christoph Fritz
2016-04-05 21:56 ` Bjorn Helgaas
2016-04-05 21:56 ` Bjorn Helgaas
2016-03-13 23:31 ` [PATCH v4] PCI: imx6: Add initial imx6sx support Christoph Fritz
2016-03-13 23:31 ` Christoph Fritz
2016-03-20 7:30 ` Christoph Fritz
2016-03-20 7:30 ` Christoph Fritz
2016-04-05 21:56 ` Bjorn Helgaas
2016-04-05 21:56 ` Bjorn Helgaas
2016-03-03 1:41 ` [PATCH v3 0/2] Add PCIe driver support for imx6sx Christoph Fritz
2016-03-03 1:41 ` Christoph Fritz
2016-03-03 1:46 ` Richard Zhu
2016-03-03 1:46 ` Richard Zhu
2016-03-03 1:48 ` Richard Zhu
2016-03-03 1:48 ` Richard Zhu
2016-03-07 8:20 ` Christoph Fritz
2016-03-07 8:20 ` Christoph Fritz
2016-03-09 15:39 ` Christoph Fritz
2016-03-09 15:39 ` Christoph Fritz
2016-03-09 15:53 ` Lucas Stach
2016-03-09 15:53 ` Lucas Stach
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