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Message-Id: <20210723204958.7186-4-tharvey@gateworks.com>
Date: Fri, 23 Jul 2021 13:49:55 -0700
From: Tim Harvey <tharvey@...eworks.com>
To: Richard Zhu <hongxing.zhu@....com>,
Lucas Stach <l.stach@...gutronix.de>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Rob Herring <robh+dt@...nel.org>,
Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>,
NXP Linux Team <linux-imx@....com>,
linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Krzysztof Wilczyński <kw@...ux.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc: Tim Harvey <tharvey@...eworks.com>
Subject: [PATCH 3/6] PCI: imx6: add IMX8MM support
Add IMX8MM support to the existing driver which shares most
functionality with the IMX8MM.
Signed-off-by: Tim Harvey <tharvey@...eworks.com>
---
drivers/pci/controller/dwc/pci-imx6.c | 103 +++++++++++++++++++++++++-
1 file changed, 102 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 80fc98acf097..8fb36d33a244 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -49,6 +49,7 @@ enum imx6_pcie_variants {
IMX6QP,
IMX7D,
IMX8MQ,
+ IMX8MM,
};
#define IMX6_PCIE_FLAG_IMX6_PHY BIT(0)
@@ -83,6 +84,7 @@ struct imx6_pcie {
struct regulator *vpcie;
struct regulator *vph;
void __iomem *phy_base;
+ bool ext_osc;
/* power domain for pcie */
struct device *pd_pcie;
@@ -139,10 +141,29 @@ struct imx6_pcie {
#define PCIE_PHY_CMN_REG26 0x98
#define PCIE_PHY_CMN_REG26_ATT_MODE 0xBC
+#define PCIE_PHY_CMN_REG62 0x188
+#define PCIE_PHY_CMN_REG62_PLL_CLK_OUT 0x08
+#define PCIE_PHY_CMN_REG64 0x190
+#define PCIE_PHY_CMN_REG64_AUX_RX_TX_TERM 0x8C
+#define PCIE_PHY_CMN_REG75 0x1D4
+#define PCIE_PHY_CMN_REG75_PLL_DONE 0x3
+#define PCIE_PHY_TRSV_REG5 0x414
+#define PCIE_PHY_TRSV_REG5_GEN1_DEEMP 0x2D
+#define PCIE_PHY_TRSV_REG6 0x418
+#define PCIE_PHY_TRSV_REG6_GEN2_DEEMP 0xF
+
#define PHY_RX_OVRD_IN_LO 0x1005
#define PHY_RX_OVRD_IN_LO_RX_DATA_EN BIT(5)
#define PHY_RX_OVRD_IN_LO_RX_PLL_EN BIT(3)
+#define IMX8MM_GPR_PCIE_REF_CLK_SEL (0x3 << 24)
+#define IMX8MM_GPR_PCIE_REF_CLK_PLL (0x3 << 24)
+#define IMX8MM_GPR_PCIE_REF_CLK_EXT (0x2 << 24)
+#define IMX8MM_GPR_PCIE_AUX_EN BIT(19)
+#define IMX8MM_GPR_PCIE_CMN_RST BIT(18)
+#define IMX8MM_GPR_PCIE_POWER_OFF BIT(17)
+#define IMX8MM_GPR_PCIE_SSC_EN BIT(16)
+
static int pcie_phy_poll_ack(struct imx6_pcie *imx6_pcie, bool exp_val)
{
struct dw_pcie *pci = imx6_pcie->pci;
@@ -371,6 +392,7 @@ static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
switch (imx6_pcie->drvdata->variant) {
case IMX7D:
case IMX8MQ:
+ case IMX8MM:
reset_control_assert(imx6_pcie->pciephy_reset);
reset_control_assert(imx6_pcie->apps_reset);
break;
@@ -407,7 +429,6 @@ static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
static unsigned int imx6_pcie_grp_offset(const struct imx6_pcie *imx6_pcie)
{
- WARN_ON(imx6_pcie->drvdata->variant != IMX8MQ);
return imx6_pcie->controller_id == 1 ? IOMUXC_GPR16 : IOMUXC_GPR14;
}
@@ -447,6 +468,7 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
case IMX7D:
break;
case IMX8MQ:
+ case IMX8MM:
ret = clk_prepare_enable(imx6_pcie->pcie_aux);
if (ret) {
dev_err(dev, "unable to enable pcie_aux clock\n");
@@ -536,6 +558,7 @@ static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
switch (imx6_pcie->drvdata->variant) {
case IMX8MQ:
+ case IMX8MM:
reset_control_deassert(imx6_pcie->pciephy_reset);
break;
case IMX7D:
@@ -613,7 +636,74 @@ static void imx6_pcie_configure_type(struct imx6_pcie *imx6_pcie)
static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie)
{
+ unsigned int offset;
+
switch (imx6_pcie->drvdata->variant) {
+ case IMX8MM:
+ offset = imx6_pcie_grp_offset(imx6_pcie);
+
+ dev_info(imx6_pcie->pci->dev, "%s REF_CLK is used!.\n",
+ imx6_pcie->ext_osc ? "EXT" : "PLL");
+ if (imx6_pcie->ext_osc) {
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
+ IMX8MQ_GPR_PCIE_REF_USE_PAD, 0);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
+ IMX8MM_GPR_PCIE_REF_CLK_SEL,
+ IMX8MM_GPR_PCIE_REF_CLK_SEL);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
+ IMX8MM_GPR_PCIE_AUX_EN,
+ IMX8MM_GPR_PCIE_AUX_EN);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
+ IMX8MM_GPR_PCIE_POWER_OFF, 0);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
+ IMX8MM_GPR_PCIE_SSC_EN, 0);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
+ IMX8MM_GPR_PCIE_REF_CLK_SEL,
+ IMX8MM_GPR_PCIE_REF_CLK_EXT);
+ udelay(100);
+ /* Do the PHY common block reset */
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
+ IMX8MM_GPR_PCIE_CMN_RST,
+ IMX8MM_GPR_PCIE_CMN_RST);
+ udelay(200);
+ } else {
+ /* Configure the internal PLL as REF clock */
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
+ IMX8MQ_GPR_PCIE_REF_USE_PAD, 0);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
+ IMX8MM_GPR_PCIE_REF_CLK_SEL,
+ IMX8MM_GPR_PCIE_REF_CLK_SEL);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
+ IMX8MM_GPR_PCIE_AUX_EN,
+ IMX8MM_GPR_PCIE_AUX_EN);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
+ IMX8MM_GPR_PCIE_POWER_OFF, 0);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
+ IMX8MM_GPR_PCIE_SSC_EN, 0);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
+ IMX8MM_GPR_PCIE_REF_CLK_SEL,
+ IMX8MM_GPR_PCIE_REF_CLK_PLL);
+ udelay(100);
+ /* Configure the PHY */
+ writel(PCIE_PHY_CMN_REG62_PLL_CLK_OUT,
+ imx6_pcie->phy_base + PCIE_PHY_CMN_REG62);
+ writel(PCIE_PHY_CMN_REG64_AUX_RX_TX_TERM,
+ imx6_pcie->phy_base + PCIE_PHY_CMN_REG64);
+ /* Do the PHY common block reset */
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
+ IMX8MM_GPR_PCIE_CMN_RST,
+ IMX8MM_GPR_PCIE_CMN_RST);
+ udelay(200);
+ }
+ /*
+ * In order to pass the compliance tests.
+ * Configure the TRSV regiser of iMX8MM PCIe PHY.
+ */
+ writel(PCIE_PHY_TRSV_REG5_GEN1_DEEMP,
+ imx6_pcie->phy_base + PCIE_PHY_TRSV_REG5);
+ writel(PCIE_PHY_TRSV_REG6_GEN2_DEEMP,
+ imx6_pcie->phy_base + PCIE_PHY_TRSV_REG6);
+ break;
case IMX8MQ:
/*
* TODO: Currently this code assumes external
@@ -753,6 +843,7 @@ static void imx6_pcie_ltssm_enable(struct device *dev)
break;
case IMX7D:
case IMX8MQ:
+ case IMX8MM:
reset_control_deassert(imx6_pcie->apps_reset);
break;
}
@@ -871,6 +962,7 @@ static void imx6_pcie_ltssm_disable(struct device *dev)
IMX6Q_GPR12_PCIE_CTL_2, 0);
break;
case IMX7D:
+ case IMX8MM:
reset_control_assert(imx6_pcie->apps_reset);
break;
default:
@@ -929,6 +1021,7 @@ static void imx6_pcie_clk_disable(struct imx6_pcie *imx6_pcie)
IMX7D_GPR12_PCIE_PHY_REFCLK_SEL,
IMX7D_GPR12_PCIE_PHY_REFCLK_SEL);
break;
+ case IMX8MM:
case IMX8MQ:
clk_disable_unprepare(imx6_pcie->pcie_aux);
break;
@@ -1024,6 +1117,9 @@ static int imx6_pcie_probe(struct platform_device *pdev)
if (IS_ERR(pci->dbi_base))
return PTR_ERR(pci->dbi_base);
+ /* check for EXT osc */
+ imx6_pcie->ext_osc = of_property_read_bool(node, "fsl,ext-osc");
+
/* Fetch GPIOs */
imx6_pcie->reset_gpio = of_get_named_gpio(node, "reset-gpio", 0);
imx6_pcie->gpio_active_high = of_property_read_bool(node,
@@ -1067,6 +1163,7 @@ static int imx6_pcie_probe(struct platform_device *pdev)
"pcie_inbound_axi clock missing or invalid\n");
break;
case IMX8MQ:
+ case IMX8MM:
imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux");
if (IS_ERR(imx6_pcie->pcie_aux))
return dev_err_probe(dev, PTR_ERR(imx6_pcie->pcie_aux),
@@ -1202,6 +1299,9 @@ static const struct imx6_pcie_drvdata drvdata[] = {
[IMX8MQ] = {
.variant = IMX8MQ,
},
+ [IMX8MM] = {
+ .variant = IMX8MM,
+ },
};
static const struct of_device_id imx6_pcie_of_match[] = {
@@ -1210,6 +1310,7 @@ static const struct of_device_id imx6_pcie_of_match[] = {
{ .compatible = "fsl,imx6qp-pcie", .data = &drvdata[IMX6QP], },
{ .compatible = "fsl,imx7d-pcie", .data = &drvdata[IMX7D], },
{ .compatible = "fsl,imx8mq-pcie", .data = &drvdata[IMX8MQ], } ,
+ { .compatible = "fsl,imx8mm-pcie", .data = &drvdata[IMX8MM], },
{},
};
--
2.17.1
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