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Message-Id: <20240205173335.1120469-7-Frank.Li@nxp.com>
Date: Mon, 5 Feb 2024 12:33:27 -0500
From: Frank Li <Frank.Li@....com>
To: lpieralisi@...nel.org
Cc: Frank.li@....com,
bhelgaas@...gle.com,
conor+dt@...nel.org,
devicetree@...r.kernel.org,
festevam@...il.com,
helgaas@...nel.org,
hongxing.zhu@....com,
imx@...ts.linux.dev,
kernel@...gutronix.de,
krzysztof.kozlowski+dt@...aro.org,
krzysztof.kozlowski@...aro.org,
kw@...ux.com,
l.stach@...gutronix.de,
linux-arm-kernel@...ts.infradead.org,
linux-imx@....com,
linux-kernel@...r.kernel.org,
linux-pci@...r.kernel.org,
manivannan.sadhasivam@...aro.org,
robh@...nel.org,
s.hauer@...gutronix.de,
shawnguo@...nel.org
Subject: [PATCH v10 06/14] PCI: imx6: Simplify switch-case logic by involve init_phy callback
Instead of using the switch case statement to initialize the PHY handled by
this driver itself, let's introduce a new callback init_phy() and define it
for platforms that require it. This simplifies the code.
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Signed-off-by: Frank Li <Frank.Li@....com>
---
Notes:
Change from v7 to v8:
- rework commit message
- wrap comments to 100 chars
- return 0 at imx7d_pcie_init_phy()
change from v1 to v4:
- none
drivers/pci/controller/dwc/pci-imx6.c | 134 +++++++++++++-------------
1 file changed, 69 insertions(+), 65 deletions(-)
diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 4eeaf54709afd..c266b9f098a5b 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -69,6 +69,9 @@ enum imx6_pcie_variants {
#define IMX6_PCIE_MAX_CLKS 6
#define IMX6_PCIE_MAX_INSTANCES 2
+
+struct imx6_pcie;
+
struct imx6_pcie_drvdata {
enum imx6_pcie_variants variant;
enum dw_pcie_device_mode mode;
@@ -81,6 +84,7 @@ struct imx6_pcie_drvdata {
const u32 ltssm_mask;
const u32 mode_off[IMX6_PCIE_MAX_INSTANCES];
const u32 mode_mask[IMX6_PCIE_MAX_INSTANCES];
+ int (*init_phy)(struct imx6_pcie *pcie);
};
struct imx6_pcie {
@@ -322,76 +326,66 @@ static int pcie_phy_write(struct imx6_pcie *imx6_pcie, int addr, u16 data)
return 0;
}
-static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie)
+static int imx8mq_pcie_init_phy(struct imx6_pcie *imx6_pcie)
{
- switch (imx6_pcie->drvdata->variant) {
- case IMX8MM:
- case IMX8MM_EP:
- case IMX8MP:
- case IMX8MP_EP:
- /*
- * The PHY initialization had been done in the PHY
- * driver, break here directly.
- */
- break;
- case IMX8MQ:
- case IMX8MQ_EP:
- /*
- * TODO: Currently this code assumes external
- * oscillator is being used
- */
+ /* TODO: Currently this code assumes external oscillator is being used */
+ regmap_update_bits(imx6_pcie->iomuxc_gpr,
+ imx6_pcie_grp_offset(imx6_pcie),
+ IMX8MQ_GPR_PCIE_REF_USE_PAD,
+ IMX8MQ_GPR_PCIE_REF_USE_PAD);
+ /*
+ * Regarding the datasheet, the PCIE_VPH is suggested to be 1.8V. If the PCIE_VPH is
+ * supplied by 3.3V, the VREG_BYPASS should be cleared to zero.
+ */
+ if (imx6_pcie->vph && regulator_get_voltage(imx6_pcie->vph) > 3000000)
regmap_update_bits(imx6_pcie->iomuxc_gpr,
imx6_pcie_grp_offset(imx6_pcie),
- IMX8MQ_GPR_PCIE_REF_USE_PAD,
- IMX8MQ_GPR_PCIE_REF_USE_PAD);
- /*
- * Regarding the datasheet, the PCIE_VPH is suggested
- * to be 1.8V. If the PCIE_VPH is supplied by 3.3V, the
- * VREG_BYPASS should be cleared to zero.
- */
- if (imx6_pcie->vph &&
- regulator_get_voltage(imx6_pcie->vph) > 3000000)
- regmap_update_bits(imx6_pcie->iomuxc_gpr,
- imx6_pcie_grp_offset(imx6_pcie),
- IMX8MQ_GPR_PCIE_VREG_BYPASS,
- 0);
- break;
- case IMX7D:
- regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
- IMX7D_GPR12_PCIE_PHY_REFCLK_SEL, 0);
- break;
- case IMX6SX:
- regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
- IMX6SX_GPR12_PCIE_RX_EQ_MASK,
- IMX6SX_GPR12_PCIE_RX_EQ_2);
- fallthrough;
- default:
- regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+ IMX8MQ_GPR_PCIE_VREG_BYPASS,
+ 0);
+
+ return 0;
+}
+
+static int imx7d_pcie_init_phy(struct imx6_pcie *imx6_pcie)
+{
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, IMX7D_GPR12_PCIE_PHY_REFCLK_SEL, 0);
+
+ return 0;
+}
+
+static int imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie)
+{
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
IMX6Q_GPR12_PCIE_CTL_2, 0 << 10);
- /* configure constant input signal to the pcie ctrl and phy */
- regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
- IMX6Q_GPR12_LOS_LEVEL, 9 << 4);
-
- regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
- IMX6Q_GPR8_TX_DEEMPH_GEN1,
- imx6_pcie->tx_deemph_gen1 << 0);
- regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
- IMX6Q_GPR8_TX_DEEMPH_GEN2_3P5DB,
- imx6_pcie->tx_deemph_gen2_3p5db << 6);
- regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
- IMX6Q_GPR8_TX_DEEMPH_GEN2_6DB,
- imx6_pcie->tx_deemph_gen2_6db << 12);
- regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
- IMX6Q_GPR8_TX_SWING_FULL,
- imx6_pcie->tx_swing_full << 18);
- regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
- IMX6Q_GPR8_TX_SWING_LOW,
- imx6_pcie->tx_swing_low << 25);
- break;
- }
+ /* configure constant input signal to the pcie ctrl and phy */
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+ IMX6Q_GPR12_LOS_LEVEL, 9 << 4);
+
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
+ IMX6Q_GPR8_TX_DEEMPH_GEN1,
+ imx6_pcie->tx_deemph_gen1 << 0);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
+ IMX6Q_GPR8_TX_DEEMPH_GEN2_3P5DB,
+ imx6_pcie->tx_deemph_gen2_3p5db << 6);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
+ IMX6Q_GPR8_TX_DEEMPH_GEN2_6DB,
+ imx6_pcie->tx_deemph_gen2_6db << 12);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
+ IMX6Q_GPR8_TX_SWING_FULL,
+ imx6_pcie->tx_swing_full << 18);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR8,
+ IMX6Q_GPR8_TX_SWING_LOW,
+ imx6_pcie->tx_swing_low << 25);
+ return 0;
+}
- imx6_pcie_configure_type(imx6_pcie);
+static int imx6sx_pcie_init_phy(struct imx6_pcie *imx6_pcie)
+{
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+ IMX6SX_GPR12_PCIE_RX_EQ_MASK, IMX6SX_GPR12_PCIE_RX_EQ_2);
+
+ return imx6_pcie_init_phy(imx6_pcie);
}
static void imx7d_pcie_wait_for_phy_pll_lock(struct imx6_pcie *imx6_pcie)
@@ -902,7 +896,11 @@ static int imx6_pcie_host_init(struct dw_pcie_rp *pp)
}
imx6_pcie_assert_core_reset(imx6_pcie);
- imx6_pcie_init_phy(imx6_pcie);
+
+ if (imx6_pcie->drvdata->init_phy)
+ imx6_pcie->drvdata->init_phy(imx6_pcie);
+
+ imx6_pcie_configure_type(imx6_pcie);
ret = imx6_pcie_clk_enable(imx6_pcie);
if (ret) {
@@ -1380,6 +1378,7 @@ static const struct imx6_pcie_drvdata drvdata[] = {
.ltssm_mask = IMX6Q_GPR12_PCIE_CTL_2,
.mode_off[0] = IOMUXC_GPR12,
.mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
+ .init_phy = imx6_pcie_init_phy,
},
[IMX6SX] = {
.variant = IMX6SX,
@@ -1393,6 +1392,7 @@ static const struct imx6_pcie_drvdata drvdata[] = {
.ltssm_mask = IMX6Q_GPR12_PCIE_CTL_2,
.mode_off[0] = IOMUXC_GPR12,
.mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
+ .init_phy = imx6sx_pcie_init_phy,
},
[IMX6QP] = {
.variant = IMX6QP,
@@ -1407,6 +1407,7 @@ static const struct imx6_pcie_drvdata drvdata[] = {
.ltssm_mask = IMX6Q_GPR12_PCIE_CTL_2,
.mode_off[0] = IOMUXC_GPR12,
.mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
+ .init_phy = imx6_pcie_init_phy,
},
[IMX7D] = {
.variant = IMX7D,
@@ -1418,6 +1419,7 @@ static const struct imx6_pcie_drvdata drvdata[] = {
.clks_cnt = ARRAY_SIZE(imx6q_clks),
.mode_off[0] = IOMUXC_GPR12,
.mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
+ .init_phy = imx7d_pcie_init_phy,
},
[IMX8MQ] = {
.variant = IMX8MQ,
@@ -1430,6 +1432,7 @@ static const struct imx6_pcie_drvdata drvdata[] = {
.mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
.mode_off[1] = IOMUXC_GPR12,
.mode_mask[1] = IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE,
+ .init_phy = imx8mq_pcie_init_phy,
},
[IMX8MM] = {
.variant = IMX8MM,
@@ -1465,6 +1468,7 @@ static const struct imx6_pcie_drvdata drvdata[] = {
.mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
.mode_off[1] = IOMUXC_GPR12,
.mode_mask[1] = IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE,
+ .init_phy = imx8mq_pcie_init_phy,
},
[IMX8MM_EP] = {
.variant = IMX8MM_EP,
--
2.34.1
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