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path: root/drivers/pci/controller/dwc/pci-imx6.c
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Diffstat (limited to 'drivers/pci/controller/dwc/pci-imx6.c')
-rw-r--r--drivers/pci/controller/dwc/pci-imx6.c235
1 files changed, 209 insertions, 26 deletions
diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 52e47dac028f..3d627f94a166 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -8,6 +8,7 @@
* Author: Sean Cross <xobs@kosagi.com>
*/
+#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/gpio.h>
@@ -18,6 +19,7 @@
#include <linux/module.h>
#include <linux/of_gpio.h>
#include <linux/of_device.h>
+#include <linux/of_address.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
@@ -32,6 +34,12 @@
#include "pcie-designware.h"
+#define IMX8MQ_GPR_PCIE_REF_USE_PAD BIT(9)
+#define IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN BIT(10)
+#define IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE BIT(11)
+#define IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE GENMASK(11, 8)
+#define IMX8MQ_PCIE2_BASE_ADDR 0x33c00000
+
#define to_imx6_pcie(x) dev_get_drvdata((x)->dev)
enum imx6_pcie_variants {
@@ -39,6 +47,15 @@ enum imx6_pcie_variants {
IMX6SX,
IMX6QP,
IMX7D,
+ IMX8MQ,
+};
+
+#define IMX6_PCIE_FLAG_IMX6_PHY BIT(0)
+#define IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE BIT(1)
+
+struct imx6_pcie_drvdata {
+ enum imx6_pcie_variants variant;
+ u32 flags;
};
struct imx6_pcie {
@@ -49,11 +66,12 @@ struct imx6_pcie {
struct clk *pcie_phy;
struct clk *pcie_inbound_axi;
struct clk *pcie;
+ struct clk *pcie_aux;
struct regmap *iomuxc_gpr;
+ u32 controller_id;
struct reset_control *pciephy_reset;
struct reset_control *apps_reset;
struct reset_control *turnoff_reset;
- enum imx6_pcie_variants variant;
u32 tx_deemph_gen1;
u32 tx_deemph_gen2_3p5db;
u32 tx_deemph_gen2_6db;
@@ -61,11 +79,13 @@ struct imx6_pcie {
u32 tx_swing_low;
int link_gen;
struct regulator *vpcie;
+ void __iomem *phy_base;
/* power domain for pcie */
struct device *pd_pcie;
/* power domain for pcie phy */
struct device *pd_pcie_phy;
+ const struct imx6_pcie_drvdata *drvdata;
};
/* Parameters for the waiting for PCIe PHY PLL to lock on i.MX7 */
@@ -101,7 +121,6 @@ struct imx6_pcie {
#define PCIE_PHY_STAT_ACK_LOC 16
#define PCIE_LINK_WIDTH_SPEED_CONTROL 0x80C
-#define PORT_LOGIC_SPEED_CHANGE (0x1 << 17)
/* PHY registers (not memory-mapped) */
#define PCIE_PHY_ATEOVRD 0x10
@@ -117,6 +136,23 @@ struct imx6_pcie {
#define PCIE_PHY_RX_ASIC_OUT 0x100D
#define PCIE_PHY_RX_ASIC_OUT_VALID (1 << 0)
+/* iMX7 PCIe PHY registers */
+#define PCIE_PHY_CMN_REG4 0x14
+/* These are probably the bits that *aren't* DCC_FB_EN */
+#define PCIE_PHY_CMN_REG4_DCC_FB_EN 0x29
+
+#define PCIE_PHY_CMN_REG15 0x54
+#define PCIE_PHY_CMN_REG15_DLY_4 BIT(2)
+#define PCIE_PHY_CMN_REG15_PLL_PD BIT(5)
+#define PCIE_PHY_CMN_REG15_OVRD_PLL_PD BIT(7)
+
+#define PCIE_PHY_CMN_REG24 0x90
+#define PCIE_PHY_CMN_REG24_RX_EQ BIT(6)
+#define PCIE_PHY_CMN_REG24_RX_EQ_SEL BIT(3)
+
+#define PCIE_PHY_CMN_REG26 0x98
+#define PCIE_PHY_CMN_REG26_ATT_MODE 0xBC
+
#define PHY_RX_OVRD_IN_LO 0x1005
#define PHY_RX_OVRD_IN_LO_RX_DATA_EN (1 << 5)
#define PHY_RX_OVRD_IN_LO_RX_PLL_EN (1 << 3)
@@ -251,6 +287,9 @@ static void imx6_pcie_reset_phy(struct imx6_pcie *imx6_pcie)
{
u32 tmp;
+ if (!(imx6_pcie->drvdata->flags & IMX6_PCIE_FLAG_IMX6_PHY))
+ return;
+
pcie_phy_read(imx6_pcie, PHY_RX_OVRD_IN_LO, &tmp);
tmp |= (PHY_RX_OVRD_IN_LO_RX_DATA_EN |
PHY_RX_OVRD_IN_LO_RX_PLL_EN);
@@ -264,6 +303,7 @@ static void imx6_pcie_reset_phy(struct imx6_pcie *imx6_pcie)
pcie_phy_write(imx6_pcie, PHY_RX_OVRD_IN_LO, tmp);
}
+#ifdef CONFIG_ARM
/* Added for PCI abort handling */
static int imx6q_pcie_abort_handler(unsigned long addr,
unsigned int fsr, struct pt_regs *regs)
@@ -297,6 +337,7 @@ static int imx6q_pcie_abort_handler(unsigned long addr,
return 1;
}
+#endif
static int imx6_pcie_attach_pd(struct device *dev)
{
@@ -310,6 +351,9 @@ static int imx6_pcie_attach_pd(struct device *dev)
imx6_pcie->pd_pcie = dev_pm_domain_attach_by_name(dev, "pcie");
if (IS_ERR(imx6_pcie->pd_pcie))
return PTR_ERR(imx6_pcie->pd_pcie);
+ /* Do nothing when power domain missing */
+ if (!imx6_pcie->pd_pcie)
+ return 0;
link = device_link_add(dev, imx6_pcie->pd_pcie,
DL_FLAG_STATELESS |
DL_FLAG_PM_RUNTIME |
@@ -323,13 +367,13 @@ static int imx6_pcie_attach_pd(struct device *dev)
if (IS_ERR(imx6_pcie->pd_pcie_phy))
return PTR_ERR(imx6_pcie->pd_pcie_phy);
- device_link_add(dev, imx6_pcie->pd_pcie_phy,
+ link = device_link_add(dev, imx6_pcie->pd_pcie_phy,
DL_FLAG_STATELESS |
DL_FLAG_PM_RUNTIME |
DL_FLAG_RPM_ACTIVE);
- if (IS_ERR(link)) {
- dev_err(dev, "Failed to add device_link to pcie_phy pd: %ld\n", PTR_ERR(link));
- return PTR_ERR(link);
+ if (!link) {
+ dev_err(dev, "Failed to add device_link to pcie_phy pd.\n");
+ return -EINVAL;
}
return 0;
@@ -339,8 +383,9 @@ static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
{
struct device *dev = imx6_pcie->pci->dev;
- switch (imx6_pcie->variant) {
+ switch (imx6_pcie->drvdata->variant) {
case IMX7D:
+ case IMX8MQ:
reset_control_assert(imx6_pcie->pciephy_reset);
reset_control_assert(imx6_pcie->apps_reset);
break;
@@ -375,13 +420,20 @@ 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;
+}
+
static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
{
struct dw_pcie *pci = imx6_pcie->pci;
struct device *dev = pci->dev;
+ unsigned int offset;
int ret = 0;
- switch (imx6_pcie->variant) {
+ switch (imx6_pcie->drvdata->variant) {
case IMX6SX:
ret = clk_prepare_enable(imx6_pcie->pcie_inbound_axi);
if (ret) {
@@ -409,6 +461,25 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
break;
case IMX7D:
break;
+ case IMX8MQ:
+ ret = clk_prepare_enable(imx6_pcie->pcie_aux);
+ if (ret) {
+ dev_err(dev, "unable to enable pcie_aux clock\n");
+ break;
+ }
+
+ offset = imx6_pcie_grp_offset(imx6_pcie);
+ /*
+ * Set the over ride low and enabled
+ * make sure that REF_CLK is turned on.
+ */
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
+ IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE,
+ 0);
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, offset,
+ IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN,
+ IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN);
+ break;
}
return ret;
@@ -484,9 +555,32 @@ static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
!imx6_pcie->gpio_active_high);
}
- switch (imx6_pcie->variant) {
+ switch (imx6_pcie->drvdata->variant) {
+ case IMX8MQ:
+ reset_control_deassert(imx6_pcie->pciephy_reset);
+ break;
case IMX7D:
reset_control_deassert(imx6_pcie->pciephy_reset);
+
+ /* Workaround for ERR010728, failure of PCI-e PLL VCO to
+ * oscillate, especially when cold. This turns off "Duty-cycle
+ * Corrector" and other mysterious undocumented things.
+ */
+ if (likely(imx6_pcie->phy_base)) {
+ /* De-assert DCC_FB_EN */
+ writel(PCIE_PHY_CMN_REG4_DCC_FB_EN,
+ imx6_pcie->phy_base + PCIE_PHY_CMN_REG4);
+ /* Assert RX_EQS and RX_EQS_SEL */
+ writel(PCIE_PHY_CMN_REG24_RX_EQ_SEL
+ | PCIE_PHY_CMN_REG24_RX_EQ,
+ imx6_pcie->phy_base + PCIE_PHY_CMN_REG24);
+ /* Assert ATT_MODE */
+ writel(PCIE_PHY_CMN_REG26_ATT_MODE,
+ imx6_pcie->phy_base + PCIE_PHY_CMN_REG26);
+ } else {
+ dev_warn(dev, "Unable to apply ERR010728 workaround. DT missing fsl,imx7d-pcie-phy phandle ?\n");
+ }
+
imx7d_pcie_wait_for_phy_pll_lock(imx6_pcie);
break;
case IMX6SX:
@@ -520,9 +614,37 @@ err_pcie_phy:
}
}
+static void imx6_pcie_configure_type(struct imx6_pcie *imx6_pcie)
+{
+ unsigned int mask, val;
+
+ if (imx6_pcie->drvdata->variant == IMX8MQ &&
+ imx6_pcie->controller_id == 1) {
+ mask = IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE;
+ val = FIELD_PREP(IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE,
+ PCI_EXP_TYPE_ROOT_PORT);
+ } else {
+ mask = IMX6Q_GPR12_DEVICE_TYPE;
+ val = FIELD_PREP(IMX6Q_GPR12_DEVICE_TYPE,
+ PCI_EXP_TYPE_ROOT_PORT);
+ }
+
+ regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12, mask, val);
+}
+
static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie)
{
- switch (imx6_pcie->variant) {
+ switch (imx6_pcie->drvdata->variant) {
+ case IMX8MQ:
+ /*
+ * 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);
+ break;
case IMX7D:
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
IMX7D_GPR12_PCIE_PHY_REFCLK_SEL, 0);
@@ -558,8 +680,7 @@ static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie)
break;
}
- regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
- IMX6Q_GPR12_DEVICE_TYPE, PCI_EXP_TYPE_ROOT_PORT << 12);
+ imx6_pcie_configure_type(imx6_pcie);
}
static int imx6_setup_phy_mpll(struct imx6_pcie *imx6_pcie)
@@ -568,6 +689,9 @@ static int imx6_setup_phy_mpll(struct imx6_pcie *imx6_pcie)
int mult, div;
u32 val;
+ if (!(imx6_pcie->drvdata->flags & IMX6_PCIE_FLAG_IMX6_PHY))
+ return 0;
+
switch (phy_rate) {
case 125000000:
/*
@@ -644,7 +768,7 @@ static void imx6_pcie_ltssm_enable(struct device *dev)
{
struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
- switch (imx6_pcie->variant) {
+ switch (imx6_pcie->drvdata->variant) {
case IMX6Q:
case IMX6SX:
case IMX6QP:
@@ -653,6 +777,7 @@ static void imx6_pcie_ltssm_enable(struct device *dev)
IMX6Q_GPR12_PCIE_CTL_2);
break;
case IMX7D:
+ case IMX8MQ:
reset_control_deassert(imx6_pcie->apps_reset);
break;
}
@@ -697,7 +822,8 @@ static int imx6_pcie_establish_link(struct imx6_pcie *imx6_pcie)
tmp |= PORT_LOGIC_SPEED_CHANGE;
dw_pcie_writel_dbi(pci, PCIE_LINK_WIDTH_SPEED_CONTROL, tmp);
- if (imx6_pcie->variant != IMX7D) {
+ if (imx6_pcie->drvdata->flags &
+ IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE) {
/*
* On i.MX7, DIRECT_SPEED_CHANGE behaves differently
* from i.MX6 family when no link speed transition
@@ -794,7 +920,7 @@ static void imx6_pcie_ltssm_disable(struct device *dev)
{
struct imx6_pcie *imx6_pcie = dev_get_drvdata(dev);
- switch (imx6_pcie->variant) {
+ switch (imx6_pcie->drvdata->variant) {
case IMX6SX:
case IMX6QP:
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
@@ -820,7 +946,7 @@ static void imx6_pcie_pm_turnoff(struct imx6_pcie *imx6_pcie)
}
/* Others poke directly at IOMUXC registers */
- switch (imx6_pcie->variant) {
+ switch (imx6_pcie->drvdata->variant) {
case IMX6SX:
regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
IMX6SX_GPR12_PCIE_PM_TURN_OFF,
@@ -850,7 +976,7 @@ static void imx6_pcie_clk_disable(struct imx6_pcie *imx6_pcie)
clk_disable_unprepare(imx6_pcie->pcie_phy);
clk_disable_unprepare(imx6_pcie->pcie_bus);
- switch (imx6_pcie->variant) {
+ switch (imx6_pcie->drvdata->variant) {
case IMX6SX:
clk_disable_unprepare(imx6_pcie->pcie_inbound_axi);
break;
@@ -859,6 +985,9 @@ 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 IMX8MQ:
+ clk_disable_unprepare(imx6_pcie->pcie_aux);
+ break;
default:
break;
}
@@ -866,8 +995,8 @@ static void imx6_pcie_clk_disable(struct imx6_pcie *imx6_pcie)
static inline bool imx6_pcie_supports_suspend(struct imx6_pcie *imx6_pcie)
{
- return (imx6_pcie->variant == IMX7D ||
- imx6_pcie->variant == IMX6SX);
+ return (imx6_pcie->drvdata->variant == IMX7D ||
+ imx6_pcie->drvdata->variant == IMX6SX);
}
static int imx6_pcie_suspend_noirq(struct device *dev)
@@ -916,6 +1045,7 @@ static int imx6_pcie_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct dw_pcie *pci;
struct imx6_pcie *imx6_pcie;
+ struct device_node *np;
struct resource *dbi_base;
struct device_node *node = dev->of_node;
int ret;
@@ -933,8 +1063,24 @@ static int imx6_pcie_probe(struct platform_device *pdev)
pci->ops = &dw_pcie_ops;
imx6_pcie->pci = pci;
- imx6_pcie->variant =
- (enum imx6_pcie_variants)of_device_get_match_data(dev);
+ imx6_pcie->drvdata = of_device_get_match_data(dev);
+
+ /* Find the PHY if one is defined, only imx7d uses it */
+ np = of_parse_phandle(node, "fsl,imx7d-pcie-phy", 0);
+ if (np) {
+ struct resource res;
+
+ ret = of_address_to_resource(np, 0, &res);
+ if (ret) {
+ dev_err(dev, "Unable to map PCIe PHY\n");
+ return ret;
+ }
+ imx6_pcie->phy_base = devm_ioremap_resource(dev, &res);
+ if (IS_ERR(imx6_pcie->phy_base)) {
+ dev_err(dev, "Unable to map PCIe PHY\n");
+ return PTR_ERR(imx6_pcie->phy_base);
+ }
+ }
dbi_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
pci->dbi_base = devm_ioremap_resource(dev, dbi_base);
@@ -978,7 +1124,7 @@ static int imx6_pcie_probe(struct platform_device *pdev)
return PTR_ERR(imx6_pcie->pcie);
}
- switch (imx6_pcie->variant) {
+ switch (imx6_pcie->drvdata->variant) {
case IMX6SX:
imx6_pcie->pcie_inbound_axi = devm_clk_get(dev,
"pcie_inbound_axi");
@@ -987,7 +1133,17 @@ static int imx6_pcie_probe(struct platform_device *pdev)
return PTR_ERR(imx6_pcie->pcie_inbound_axi);
}
break;
+ case IMX8MQ:
+ imx6_pcie->pcie_aux = devm_clk_get(dev, "pcie_aux");
+ if (IS_ERR(imx6_pcie->pcie_aux)) {
+ dev_err(dev, "pcie_aux clock source missing or invalid\n");
+ return PTR_ERR(imx6_pcie->pcie_aux);
+ }
+ /* fall through */
case IMX7D:
+ if (dbi_base->start == IMX8MQ_PCIE2_BASE_ADDR)
+ imx6_pcie->controller_id = 1;
+
imx6_pcie->pciephy_reset = devm_reset_control_get_exclusive(dev,
"pciephy");
if (IS_ERR(imx6_pcie->pciephy_reset)) {
@@ -1084,11 +1240,36 @@ static void imx6_pcie_shutdown(struct platform_device *pdev)
imx6_pcie_assert_core_reset(imx6_pcie);
}
+static const struct imx6_pcie_drvdata drvdata[] = {
+ [IMX6Q] = {
+ .variant = IMX6Q,
+ .flags = IMX6_PCIE_FLAG_IMX6_PHY |
+ IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE,
+ },
+ [IMX6SX] = {
+ .variant = IMX6SX,
+ .flags = IMX6_PCIE_FLAG_IMX6_PHY |
+ IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE,
+ },
+ [IMX6QP] = {
+ .variant = IMX6QP,
+ .flags = IMX6_PCIE_FLAG_IMX6_PHY |
+ IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE,
+ },
+ [IMX7D] = {
+ .variant = IMX7D,
+ },
+ [IMX8MQ] = {
+ .variant = IMX8MQ,
+ },
+};
+
static const struct of_device_id imx6_pcie_of_match[] = {
- { .compatible = "fsl,imx6q-pcie", .data = (void *)IMX6Q, },
- { .compatible = "fsl,imx6sx-pcie", .data = (void *)IMX6SX, },
- { .compatible = "fsl,imx6qp-pcie", .data = (void *)IMX6QP, },
- { .compatible = "fsl,imx7d-pcie", .data = (void *)IMX7D, },
+ { .compatible = "fsl,imx6q-pcie", .data = &drvdata[IMX6Q], },
+ { .compatible = "fsl,imx6sx-pcie", .data = &drvdata[IMX6SX], },
+ { .compatible = "fsl,imx6qp-pcie", .data = &drvdata[IMX6QP], },
+ { .compatible = "fsl,imx7d-pcie", .data = &drvdata[IMX7D], },
+ { .compatible = "fsl,imx8mq-pcie", .data = &drvdata[IMX8MQ], } ,
{},
};
@@ -1105,6 +1286,7 @@ static struct platform_driver imx6_pcie_driver = {
static int __init imx6_pcie_init(void)
{
+#ifdef CONFIG_ARM
/*
* Since probe() can be deferred we need to make sure that
* hook_fault_code is not called after __init memory is freed
@@ -1114,6 +1296,7 @@ static int __init imx6_pcie_init(void)
*/
hook_fault_code(8, imx6q_pcie_abort_handler, SIGBUS, 0,
"external abort on non-linefetch");
+#endif
return platform_driver_register(&imx6_pcie_driver);
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.