[RFC 3/7] phy: freescale: imx8m-pcie: Add iMX8MP PCIe PHY support
From: Richard Zhu
Date: Mon Mar 07 2022 - 01:23:59 EST
Add the i.MX8MP PCIe PHY support
Signed-off-by: Richard Zhu <hongxing.zhu@xxxxxxx>
---
drivers/phy/freescale/phy-fsl-imx8m-pcie.c | 249 +++++++++++++++++----
1 file changed, 205 insertions(+), 44 deletions(-)
diff --git a/drivers/phy/freescale/phy-fsl-imx8m-pcie.c b/drivers/phy/freescale/phy-fsl-imx8m-pcie.c
index 04b1aafb29f4..ffe3b30bff48 100644
--- a/drivers/phy/freescale/phy-fsl-imx8m-pcie.c
+++ b/drivers/phy/freescale/phy-fsl-imx8m-pcie.c
@@ -11,12 +11,16 @@
#include <linux/mfd/syscon.h>
#include <linux/mfd/syscon/imx7-iomuxc-gpr.h>
#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include <dt-bindings/phy/phy-imx8-pcie.h>
+#define IMX8MM_PCIE_PHY_CMN_REG020 0x80
+#define PLL_ANA_LPF_R_SEL_FINE_0_4 0x04
#define IMX8MM_PCIE_PHY_CMN_REG061 0x184
#define ANA_PLL_CLK_OUT_TO_EXT_IO_EN BIT(0)
#define IMX8MM_PCIE_PHY_CMN_REG062 0x188
@@ -30,12 +34,47 @@
#define IMX8MM_PCIE_PHY_CMN_REG065 0x194
#define ANA_AUX_RX_TERM (BIT(7) | BIT(4))
#define ANA_AUX_TX_LVL GENMASK(3, 0)
-#define IMX8MM_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 IMX8MM_PCIE_PHY_CMN_REG075 0x1D4
+#define ANA_PLL_DONE 0x3
+#define IMX8MM_PCIE_PHY_CMN_REG076 0x200
+#define LANE_RESET_MUX_SEL 0x00
+#define IMX8MM_PCIE_PHY_CMN_REG078 0x208
+#define LANE_TX_DATA_CLK_MUX_SEL 0x00
+
+#define PCIE_PHY_TRSV_REG001 0x404
+#define LN0_OVRD_TX_DRV_LVL_G1 0x3F
+#define PCIE_PHY_TRSV_REG002 0x408
+#define LN0_OVRD_TX_DRV_LVL_G2 0x1F
+#define PCIE_PHY_TRSV_REG003 0x40C
+#define LN0_OVRD_TX_DRV_LVL_G3 0x1F
+#define PCIE_PHY_TRSV_REG005 0x414
+#define LN0_OVRD_TX_DRV_PST_LVL_G1 0x2B
+#define PCIE_PHY_TRSV_REG006 0x418
+#define LN0_OVRD_TX_DRV_PST_LVL_G2 0xB
+#define PCIE_PHY_TRSV_REG007 0x41C
+#define LN0_OVRD_TX_DRV_PST_LVL_G3 0xB
+#define PCIE_PHY_TRSV_REG009 0x424
+#define LN0_OVRD_TX_DRV_PRE_LVL_G1 0x15
+#define PCIE_PHY_TRSV_REG00A 0x428
+#define LN0_OVRD_TX_DRV_PRE_LVL_G23 0x55
+#define PCIE_PHY_TRSV_REG059 0x4EC
+#define LN0_OVRD_RX_CTLE_RS1_G1 0x13
+#define PCIE_PHY_TRSV_REG060 0x4F0
+#define LN0_OVRD_RX_CTLE_RS1_G2_G3 0x25
+#define PCIE_PHY_TRSV_REG069 0x514
+#define LN0_ANA_RX_CTLE_IBLEED 0x7
+#define PCIE_PHY_TRSV_REG107 0x5AC
+#define LN0_OVRD_RX_RTERM_VCM_EN 0xB8
+#define PCIE_PHY_TRSV_REG109 0x5B4
+#define LN0_ANA_OVRD_RX_SQHS_DIFN_OC 0xD4
+#define PCIE_PHY_TRSV_REG110 0x5B8
+#define LN0_ANA_OVRD_RX_SQHS_DIFP_OC 0x6A
+#define PCIE_PHY_TRSV_REG158 0x678
+#define LN0_RX_CDR_FBB_FINE_G1_G2 0x55
+#define PCIE_PHY_TRSV_REG159 0x67C
+#define LN0_RX_CDR_FBB_FINE_G3_G4 0x53
+#define PCIE_PHY_TRSV_REG206 0x738
+#define LN0_TG_RX_SIGVAL_LBF_DELAY 0x4
#define IMX8MM_GPR_PCIE_REF_CLK_SEL GENMASK(25, 24)
#define IMX8MM_GPR_PCIE_REF_CLK_PLL FIELD_PREP(IMX8MM_GPR_PCIE_REF_CLK_SEL, 0x3)
@@ -46,16 +85,43 @@
#define IMX8MM_GPR_PCIE_SSC_EN BIT(16)
#define IMX8MM_GPR_PCIE_AUX_EN_OVERRIDE BIT(9)
+#define IMX8MP_GPR_REG0 0x0
+#define IMX8MP_GPR_CLK_MOD_EN BIT(0)
+#define IMX8MP_GPR_PHY_APB_RST BIT(4)
+#define IMX8MP_GPR_PHY_INIT_RST BIT(5)
+#define IMX8MP_GPR_REG1 0x4
+#define IMX8MP_GPR_PM_EN_CORE_CLK BIT(0)
+#define IMX8MP_GPR_PLL_LOCK BIT(13)
+#define IMX8MP_GPR_REG2 0x8
+#define IMX8MP_GPR_P_PLL_MASK GENMASK(5, 0)
+#define IMX8MP_GPR_M_PLL_MASK GENMASK(15, 6)
+#define IMX8MP_GPR_S_PLL_MASK GENMASK(18, 16)
+#define IMX8MP_GPR_P_PLL (0xc << 0)
+#define IMX8MP_GPR_M_PLL (0x320 << 6)
+#define IMX8MP_GPR_S_PLL (0x4 << 16)
+#define IMX8MP_GPR_REG3 0xc
+#define IMX8MP_GPR_PLL_CKE BIT(17)
+#define IMX8MP_GPR_PLL_RST BIT(31)
+
+enum imx8_pcie_phy_type {
+ IMX8MM,
+ IMX8MP,
+};
+
struct imx8_pcie_phy {
void __iomem *base;
+ struct device *dev;
struct clk *clk;
struct phy *phy;
+ struct regmap *hsio_blk_ctrl;
struct regmap *iomuxc_gpr;
struct reset_control *reset;
+ struct reset_control *perst;
u32 refclk_pad_mode;
u32 tx_deemph_gen1;
u32 tx_deemph_gen2;
bool clkreq_unused;
+ enum imx8_pcie_phy_type variant;
};
static int imx8_pcie_phy_init(struct phy *phy)
@@ -67,6 +133,88 @@ static int imx8_pcie_phy_init(struct phy *phy)
reset_control_assert(imx8_phy->reset);
pad_mode = imx8_phy->refclk_pad_mode;
+ switch (imx8_phy->variant) {
+ case IMX8MM:
+ /* Tune PHY de-emphasis setting to pass PCIe compliance. */
+ if (imx8_phy->tx_deemph_gen1)
+ writel(imx8_phy->tx_deemph_gen1,
+ imx8_phy->base + PCIE_PHY_TRSV_REG005);
+ if (imx8_phy->tx_deemph_gen2)
+ writel(imx8_phy->tx_deemph_gen2,
+ imx8_phy->base + PCIE_PHY_TRSV_REG006);
+ break;
+ case IMX8MP:
+ reset_control_assert(imx8_phy->perst);
+ /* Set P=12,M=800,S=4 and must set ICP=2'b01. */
+ regmap_update_bits(imx8_phy->hsio_blk_ctrl, IMX8MP_GPR_REG2,
+ IMX8MP_GPR_P_PLL_MASK |
+ IMX8MP_GPR_M_PLL_MASK |
+ IMX8MP_GPR_S_PLL_MASK,
+ IMX8MP_GPR_P_PLL |
+ IMX8MP_GPR_M_PLL |
+ IMX8MP_GPR_S_PLL);
+ /* wait greater than 1/F_FREF =1/2MHZ=0.5us */
+ udelay(1);
+
+ regmap_update_bits(imx8_phy->hsio_blk_ctrl, IMX8MP_GPR_REG3,
+ IMX8MP_GPR_PLL_RST,
+ IMX8MP_GPR_PLL_RST);
+ udelay(10);
+
+ /* Set 1 to pll_cke of GPR_REG3 */
+ regmap_update_bits(imx8_phy->hsio_blk_ctrl, IMX8MP_GPR_REG3,
+ IMX8MP_GPR_PLL_CKE,
+ IMX8MP_GPR_PLL_CKE);
+
+ /* Lock time should be greater than 300cycle=300*0.5us=150us */
+ ret = regmap_read_poll_timeout(imx8_phy->hsio_blk_ctrl,
+ IMX8MP_GPR_REG1, val,
+ val & IMX8MP_GPR_PLL_LOCK,
+ 10, 1000);
+ if (ret) {
+ dev_err(imx8_phy->dev, "PCIe PLL lock timeout\n");
+ return ret;
+ }
+ return -ENODEV;
+
+ /* pcie_clock_module_en */
+ regmap_update_bits(imx8_phy->hsio_blk_ctrl, IMX8MP_GPR_REG0,
+ IMX8MP_GPR_CLK_MOD_EN,
+ IMX8MP_GPR_CLK_MOD_EN);
+ udelay(10);
+
+ reset_control_deassert(imx8_phy->reset);
+ reset_control_deassert(imx8_phy->perst);
+
+ /* release pcie_phy_apb_reset and pcie_phy_init_resetn */
+ regmap_update_bits(imx8_phy->hsio_blk_ctrl, IMX8MP_GPR_REG0,
+ IMX8MP_GPR_PHY_APB_RST |
+ IMX8MP_GPR_PHY_INIT_RST,
+ IMX8MP_GPR_PHY_APB_RST |
+ IMX8MP_GPR_PHY_INIT_RST);
+ break;
+ }
+
+ if (pad_mode == IMX8_PCIE_REFCLK_PAD_INPUT) {
+ /* Configure the pad as input */
+ val = readl(imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG061);
+ writel(val & ~ANA_PLL_CLK_OUT_TO_EXT_IO_EN,
+ imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG061);
+ } else if (pad_mode == IMX8_PCIE_REFCLK_PAD_OUTPUT) {
+ /* Configure the PHY to output the refclock via pad */
+ writel(ANA_PLL_CLK_OUT_TO_EXT_IO_EN,
+ imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG061);
+ writel(ANA_PLL_CLK_OUT_TO_EXT_IO_SEL,
+ imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG062);
+ writel(AUX_PLL_REFCLK_SEL_SYS_PLL,
+ imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG063);
+ val = ANA_AUX_RX_TX_SEL_TX | ANA_AUX_TX_TERM;
+ writel(val | ANA_AUX_RX_TERM_GND_EN,
+ imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG064);
+ writel(ANA_AUX_RX_TERM | ANA_AUX_TX_LVL,
+ imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG065);
+ }
+
/* Set AUX_EN_OVERRIDE 1'b0, when the CLKREQ# isn't hooked */
regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14,
IMX8MM_GPR_PCIE_AUX_EN_OVERRIDE,
@@ -91,42 +239,30 @@ static int imx8_pcie_phy_init(struct phy *phy)
regmap_update_bits(imx8_phy->iomuxc_gpr, IOMUXC_GPR14,
IMX8MM_GPR_PCIE_CMN_RST,
IMX8MM_GPR_PCIE_CMN_RST);
- usleep_range(200, 500);
- if (pad_mode == IMX8_PCIE_REFCLK_PAD_INPUT) {
- /* Configure the pad as input */
- val = readl(imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG061);
- writel(val & ~ANA_PLL_CLK_OUT_TO_EXT_IO_EN,
- imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG061);
- } else if (pad_mode == IMX8_PCIE_REFCLK_PAD_OUTPUT) {
- /* Configure the PHY to output the refclock via pad */
- writel(ANA_PLL_CLK_OUT_TO_EXT_IO_EN,
- imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG061);
- writel(ANA_PLL_CLK_OUT_TO_EXT_IO_SEL,
- imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG062);
- writel(AUX_PLL_REFCLK_SEL_SYS_PLL,
- imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG063);
- val = ANA_AUX_RX_TX_SEL_TX | ANA_AUX_TX_TERM;
- writel(val | ANA_AUX_RX_TERM_GND_EN,
- imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG064);
- writel(ANA_AUX_RX_TERM | ANA_AUX_TX_LVL,
- imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG065);
+ switch (imx8_phy->variant) {
+ case IMX8MM:
+ reset_control_deassert(imx8_phy->reset);
+ usleep_range(200, 500);
+ break;
+
+ case IMX8MP:
+ /* wait for core_clk enabled */
+ ret = regmap_read_poll_timeout(imx8_phy->hsio_blk_ctrl,
+ IMX8MP_GPR_REG1, val,
+ val & IMX8MP_GPR_PM_EN_CORE_CLK,
+ 10, 20000);
+ if (ret) {
+ dev_err(imx8_phy->dev, "PCIe CORE CLK enable failed\n");
+ return ret;
+ }
+
+ break;
}
- /* Tune PHY de-emphasis setting to pass PCIe compliance. */
- if (imx8_phy->tx_deemph_gen1)
- writel(imx8_phy->tx_deemph_gen1,
- imx8_phy->base + PCIE_PHY_TRSV_REG5);
- if (imx8_phy->tx_deemph_gen2)
- writel(imx8_phy->tx_deemph_gen2,
- imx8_phy->base + PCIE_PHY_TRSV_REG6);
-
- reset_control_deassert(imx8_phy->reset);
-
/* Polling to check the phy is ready or not. */
- ret = readl_poll_timeout(imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG75,
- val, val == PCIE_PHY_CMN_REG75_PLL_DONE,
- 10, 20000);
+ ret = readl_poll_timeout(imx8_phy->base + IMX8MM_PCIE_PHY_CMN_REG075,
+ val, val == ANA_PLL_DONE, 10, 20000);
return ret;
}
@@ -153,18 +289,33 @@ static const struct phy_ops imx8_pcie_phy_ops = {
.owner = THIS_MODULE,
};
+static const struct of_device_id imx8_pcie_phy_of_match[] = {
+ {.compatible = "fsl,imx8mm-pcie-phy", .data = (void *)IMX8MM},
+ {.compatible = "fsl,imx8mp-pcie-phy", .data = (void *)IMX8MP},
+ { },
+};
+MODULE_DEVICE_TABLE(of, imx8_pcie_phy_of_match);
+
static int imx8_pcie_phy_probe(struct platform_device *pdev)
{
struct phy_provider *phy_provider;
struct device *dev = &pdev->dev;
+ const struct of_device_id *of_id;
struct device_node *np = dev->of_node;
struct imx8_pcie_phy *imx8_phy;
struct resource *res;
+ of_id = of_match_device(imx8_pcie_phy_of_match, dev);
+ if (!of_id)
+ return -EINVAL;
+
imx8_phy = devm_kzalloc(dev, sizeof(*imx8_phy), GFP_KERNEL);
if (!imx8_phy)
return -ENOMEM;
+ imx8_phy->dev = dev;
+ imx8_phy->variant = (enum imx8_pcie_phy_type)of_id->data;
+
/* get PHY refclk pad mode */
of_property_read_u32(np, "fsl,refclk-pad-mode",
&imx8_phy->refclk_pad_mode);
@@ -201,6 +352,22 @@ static int imx8_pcie_phy_probe(struct platform_device *pdev)
dev_err(dev, "Failed to get PCIEPHY reset control\n");
return PTR_ERR(imx8_phy->reset);
}
+ if (imx8_phy->variant == IMX8MP) {
+ /* Grab HSIO MIX config register range */
+ imx8_phy->hsio_blk_ctrl =
+ syscon_regmap_lookup_by_compatible("fsl,imx8mp-hsio-blk-ctrl");
+ if (IS_ERR(imx8_phy->hsio_blk_ctrl)) {
+ dev_err(dev, "unable to find hsio mix registers\n");
+ return PTR_ERR(imx8_phy->hsio_blk_ctrl);
+ }
+
+ imx8_phy->perst =
+ devm_reset_control_get_exclusive(dev, "perst");
+ if (IS_ERR(imx8_phy->perst)) {
+ dev_err(dev, "Failed to get PCIEPHY perst control\n");
+ return PTR_ERR(imx8_phy->perst);
+ }
+ }
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
imx8_phy->base = devm_ioremap_resource(dev, res);
@@ -218,12 +385,6 @@ static int imx8_pcie_phy_probe(struct platform_device *pdev)
return PTR_ERR_OR_ZERO(phy_provider);
}
-static const struct of_device_id imx8_pcie_phy_of_match[] = {
- {.compatible = "fsl,imx8mm-pcie-phy",},
- { },
-};
-MODULE_DEVICE_TABLE(of, imx8_pcie_phy_of_match);
-
static struct platform_driver imx8_pcie_phy_driver = {
.probe = imx8_pcie_phy_probe,
.driver = {
--
2.25.1