Port of a Linux commit 9b3fe6796d7c0e0c2b87243ce0c7f4744c54efad
Add various bits of code needed to support i.MX7D variant of the IP.
Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Reviewed-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
Acked-by: Lee Jones <lee.jones@xxxxxxxxxx>
Acked-by: Rob Herring <robh@xxxxxxxxxx>
Cc: yurovsky@xxxxxxxxx
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Fabio Estevam <fabio.estevam@xxxxxxx>
Cc: Dong Aisheng <dongas86@xxxxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Cc: devicetree@xxxxxxxxxxxxxxx
Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
---
arch/arm/mach-imx/Kconfig | 1 +
drivers/pci/Kconfig | 4 +-
drivers/pci/pci-imx6.c | 166 ++++++++++++++++++++++++++++----------
3 files changed, 125 insertions(+), 46 deletions(-)
diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index f14c9c3ed..3ad922c50 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -173,6 +173,7 @@ config ARCH_IMX7
select COMMON_CLK_OF_PROVIDER
select ARCH_HAS_FEC_IMX
select ARCH_HAS_IMX_GPT
+ select HW_HAS_PCI
config ARCH_IMX8MQ
bool
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index 1c45a1c22..d81afb3d2 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -41,8 +41,8 @@ config PCI_TEGRA
select PCI
config PCI_IMX6
- bool "Freescale i.MX6 PCIe controller"
- depends on ARCH_IMX6
+ bool "Freescale i.MX6/7 PCIe controller"
+ depends on ARCH_IMX6 || ARCH_IMX7
select PCIE_DW
select OF_PCI
select PCI
diff --git a/drivers/pci/pci-imx6.c b/drivers/pci/pci-imx6.c
index 38e002a1c..6471f95b6 100644
--- a/drivers/pci/pci-imx6.c
+++ b/drivers/pci/pci-imx6.c
@@ -27,8 +27,10 @@
#include <linux/reset.h>
#include <linux/sizes.h>
#include <mfd/imx6q-iomuxc-gpr.h>
+#include <mfd/imx7-iomuxc-gpr.h>
#include <mach/imx6-regs.h>
+#include <mach/imx7-regs.h>
#include "pcie-designware.h"
@@ -37,6 +39,7 @@
enum imx6_pcie_variants {
IMX6Q,
IMX6QP,
+ IMX7D,
};
struct imx6_pcie {
@@ -46,6 +49,8 @@ struct imx6_pcie {
struct clk *pcie_phy;
struct clk *pcie;
void __iomem *iomuxc_gpr;
+ struct reset_control *pciephy_reset;
+ struct reset_control *apps_reset;
enum imx6_pcie_variants variant;
u32 tx_deemph_gen1;
u32 tx_deemph_gen2_3p5db;
@@ -55,6 +60,11 @@ struct imx6_pcie {
int link_gen;
};
+/* Parameters for the waiting for PCIe PHY PLL to lock on i.MX7 */
+#define PHY_PLL_LOCK_WAIT_MAX_RETRIES 2000
+#define PHY_PLL_LOCK_WAIT_USLEEP_MIN 50
+#define PHY_PLL_LOCK_WAIT_USLEEP_MAX 200
+
/* PCIe Root Complex registers (memory-mapped) */
#define PCIE_RC_LCR 0x7c
#define PCIE_RC_LCR_MAX_LINK_SPEEDS_GEN1 0x1
@@ -239,6 +249,10 @@ static void imx6_pcie_assert_core_reset(struct imx6_pcie *imx6_pcie)
u32 gpr1;
switch (imx6_pcie->variant) {
+ case IMX7D:
+ reset_control_assert(imx6_pcie->pciephy_reset);
+ reset_control_assert(imx6_pcie->apps_reset);
+ break;
case IMX6QP:
gpr1 = readl(imx6_pcie->iomuxc_gpr + IOMUXC_GPR1);
gpr1 |= IMX6Q_GPR1_PCIE_SW_RST;
@@ -259,24 +273,49 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
{
u32 gpr1;
- /* power up core phy and enable ref clock */
- gpr1 = readl(imx6_pcie->iomuxc_gpr + IOMUXC_GPR1);
- gpr1 &= ~IMX6Q_GPR1_PCIE_TEST_PD;
- writel(gpr1, imx6_pcie->iomuxc_gpr + IOMUXC_GPR1);
- /*
- * 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);
- gpr1 = readl(imx6_pcie->iomuxc_gpr + IOMUXC_GPR1);
- gpr1 |= IMX6Q_GPR1_PCIE_REF_CLK_EN;
- writel(gpr1, imx6_pcie->iomuxc_gpr + IOMUXC_GPR1);
+ switch (imx6_pcie->variant) {
+ case IMX6QP:
+ case IMX6Q: /* FALLTHROUGH */
+ /* power up core phy and enable ref clock */
+ gpr1 = readl(imx6_pcie->iomuxc_gpr + IOMUXC_GPR1);
+ gpr1 &= ~IMX6Q_GPR1_PCIE_TEST_PD;
+ writel(gpr1, imx6_pcie->iomuxc_gpr + IOMUXC_GPR1);
+ /*
+ * 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);
+ gpr1 = readl(imx6_pcie->iomuxc_gpr + IOMUXC_GPR1);
+ gpr1 |= IMX6Q_GPR1_PCIE_REF_CLK_EN;
+ writel(gpr1, imx6_pcie->iomuxc_gpr + IOMUXC_GPR1);
+ break;
+ case IMX7D:
+ break;
+ }
return 0;
}
+static void imx7d_pcie_wait_for_phy_pll_lock(struct imx6_pcie *imx6_pcie)
+{
+ u32 val;
+ unsigned int retries;
+ struct device_d *dev = imx6_pcie->pci->dev;
+
+ for (retries = 0; retries < PHY_PLL_LOCK_WAIT_MAX_RETRIES; retries++) {
+ val = readl(imx6_pcie->iomuxc_gpr + IOMUXC_GPR22);
+
+ if (val & IMX7D_GPR22_PCIE_PHY_PLL_LOCKED)
+ return;
+
+ udelay(PHY_PLL_LOCK_WAIT_USLEEP_MAX);
+ }
+
+ dev_err(dev, "PCIe PLL lock timeout\n");
+}
+
static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
{
struct device_d *dev = imx6_pcie->pci->dev;
@@ -321,6 +360,10 @@ static void imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
* Release the PCIe PHY reset here
*/
switch (imx6_pcie->variant) {
+ case IMX7D:
+ reset_control_deassert(imx6_pcie->pciephy_reset);
+ imx7d_pcie_wait_for_phy_pll_lock(imx6_pcie);
+ break;
case IMX6QP:
gpr1 = readl(imx6_pcie->iomuxc_gpr + IOMUXC_GPR1);
gpr1 &= ~IMX6Q_GPR1_PCIE_SW_RST;
@@ -347,38 +390,48 @@ static void imx6_pcie_init_phy(struct imx6_pcie *imx6_pcie)
u32 gpr12, gpr8;
gpr12 = readl(imx6_pcie->iomuxc_gpr + IOMUXC_GPR12);
- gpr12 &= ~IMX6Q_GPR12_PCIE_CTL_2;
- writel(gpr12, imx6_pcie->iomuxc_gpr + IOMUXC_GPR12);
- /* configure constant input signal to the pcie ctrl and phy */
- gpr12 &= ~IMX6Q_GPR12_DEVICE_TYPE;
- gpr12 |= PCI_EXP_TYPE_ROOT_PORT << 12;
- writel(gpr12, imx6_pcie->iomuxc_gpr + IOMUXC_GPR12);
+ switch (imx6_pcie->variant) {
+ case IMX7D:
+ gpr12 &= ~IMX7D_GPR12_PCIE_PHY_REFCLK_SEL;
+ writel(gpr12, imx6_pcie->iomuxc_gpr + IOMUXC_GPR12);
+ break;
+ case IMX6QP:
+ case IMX6Q: /* FALLTHROUGH */
+ gpr12 &= ~IMX6Q_GPR12_PCIE_CTL_2;
+ writel(gpr12, imx6_pcie->iomuxc_gpr + IOMUXC_GPR12);
- gpr12 &= ~IMX6Q_GPR12_LOS_LEVEL;
- gpr12 |= 9 << 4;
- writel(gpr12, imx6_pcie->iomuxc_gpr + IOMUXC_GPR12);
+ /* configure constant input signal to the pcie ctrl and phy */
+ gpr12 &= ~IMX6Q_GPR12_LOS_LEVEL;
+ gpr12 |= 9 << 4;
+ writel(gpr12, imx6_pcie->iomuxc_gpr + IOMUXC_GPR12);
- gpr8 = readl(imx6_pcie->iomuxc_gpr + IOMUXC_GPR8);
- gpr8 &= ~IMX6Q_GPR8_TX_DEEMPH_GEN1;
- gpr8 |= imx6_pcie->tx_deemph_gen1 << 0;
- writel(gpr8, imx6_pcie->iomuxc_gpr + IOMUXC_GPR8);
+ gpr8 = readl(imx6_pcie->iomuxc_gpr + IOMUXC_GPR8);
+ gpr8 &= ~IMX6Q_GPR8_TX_DEEMPH_GEN1;
+ gpr8 |= imx6_pcie->tx_deemph_gen1 << 0;
+ writel(gpr8, imx6_pcie->iomuxc_gpr + IOMUXC_GPR8);
- gpr8 &= ~IMX6Q_GPR8_TX_DEEMPH_GEN2_3P5DB;
- gpr8 |= imx6_pcie->tx_deemph_gen2_3p5db << 6;
- writel(gpr8, imx6_pcie->iomuxc_gpr + IOMUXC_GPR8);
+ gpr8 &= ~IMX6Q_GPR8_TX_DEEMPH_GEN2_3P5DB;
+ gpr8 |= imx6_pcie->tx_deemph_gen2_3p5db << 6;
+ writel(gpr8, imx6_pcie->iomuxc_gpr + IOMUXC_GPR8);
- gpr8 &= ~IMX6Q_GPR8_TX_DEEMPH_GEN2_6DB;
- gpr8 |= imx6_pcie->tx_deemph_gen2_6db << 12;
- writel(gpr8, imx6_pcie->iomuxc_gpr + IOMUXC_GPR8);
+ gpr8 &= ~IMX6Q_GPR8_TX_DEEMPH_GEN2_6DB;
+ gpr8 |= imx6_pcie->tx_deemph_gen2_6db << 12;
+ writel(gpr8, imx6_pcie->iomuxc_gpr + IOMUXC_GPR8);
- gpr8 &= ~IMX6Q_GPR8_TX_SWING_FULL;
- gpr8 |= imx6_pcie->tx_swing_full << 18;
- writel(gpr8, imx6_pcie->iomuxc_gpr + IOMUXC_GPR8);
+ gpr8 &= ~IMX6Q_GPR8_TX_SWING_FULL;
+ gpr8 |= imx6_pcie->tx_swing_full << 18;
+ writel(gpr8, imx6_pcie->iomuxc_gpr + IOMUXC_GPR8);
- gpr8 &= ~IMX6Q_GPR8_TX_SWING_LOW;
- gpr8 |= imx6_pcie->tx_swing_low << 25;
- writel(gpr8, imx6_pcie->iomuxc_gpr + IOMUXC_GPR8);
+ gpr8 &= ~IMX6Q_GPR8_TX_SWING_LOW;
+ gpr8 |= imx6_pcie->tx_swing_low << 25;
+ writel(gpr8, imx6_pcie->iomuxc_gpr + IOMUXC_GPR8);
+ break;
+ }
+
+ gpr12 &= ~IMX6Q_GPR12_DEVICE_TYPE;
+ gpr12 |= PCI_EXP_TYPE_ROOT_PORT << 12;
+ writel(gpr12, imx6_pcie->iomuxc_gpr + IOMUXC_GPR12);
}
static int imx6_pcie_wait_for_link(struct imx6_pcie *imx6_pcie)
@@ -424,9 +477,13 @@ static int imx6_pcie_establish_link(struct imx6_pcie *imx6_pcie)
dw_pcie_writel_dbi(pci, PCIE_RC_LCR, tmp);
/* Start LTSSM. */
- gpr12 = readl(imx6_pcie->iomuxc_gpr + IOMUXC_GPR12);
- gpr12 |= IMX6Q_GPR12_PCIE_CTL_2;
- writel(gpr12, imx6_pcie->iomuxc_gpr + IOMUXC_GPR12);
+ if (imx6_pcie->variant == IMX7D) {
+ reset_control_deassert(imx6_pcie->apps_reset);
+ } else {
+ gpr12 = readl(imx6_pcie->iomuxc_gpr + IOMUXC_GPR12);
+ gpr12 |= IMX6Q_GPR12_PCIE_CTL_2;
+ writel(gpr12, imx6_pcie->iomuxc_gpr + IOMUXC_GPR12);
+ }
ret = imx6_pcie_wait_for_link(imx6_pcie);
if (ret)
@@ -577,8 +634,28 @@ static int __init imx6_pcie_probe(struct device_d *dev)
return PTR_ERR(imx6_pcie->pcie);
}
- /* Grab GPR config register range */
- imx6_pcie->iomuxc_gpr = IOMEM(MX6_IOMUXC_BASE_ADDR);
+ switch (imx6_pcie->variant) {
+ case IMX7D:
+ imx6_pcie->iomuxc_gpr = IOMEM(MX7_IOMUXC_GPR_BASE_ADDR);
+
+ imx6_pcie->pciephy_reset = reset_control_get(dev, "pciephy");
+ if (IS_ERR(imx6_pcie->pciephy_reset)) {
+ dev_err(dev, "Failed to get PCIEPHY reset contol\n");
+ return PTR_ERR(imx6_pcie->pciephy_reset);
+ }
+
+ imx6_pcie->apps_reset = reset_control_get(dev, "apps");
+ if (IS_ERR(imx6_pcie->apps_reset)) {
+ dev_err(dev, "Failed to get PCIE APPS reset contol\n");
+ return PTR_ERR(imx6_pcie->apps_reset);
+ }
+ break;
+ default:
+ /* Grab GPR config register range */
+ imx6_pcie->iomuxc_gpr = IOMEM(MX6_IOMUXC_BASE_ADDR);
+ break;
+ }
+
/* Grab PCIe PHY Tx Settings */
if (of_property_read_u32(np, "fsl,tx-deemph-gen1",
@@ -653,6 +730,7 @@ static void imx6_pcie_remove(struct device_d *dev)
static struct of_device_id imx6_pcie_of_match[] = {
{ .compatible = "fsl,imx6q-pcie", .data = (void *)IMX6Q, },
{ .compatible = "fsl,imx6qp-pcie", .data = (void *)IMX6QP, },
+ { .compatible = "fsl,imx7d-pcie", .data = (void *)IMX7D, },
{},
};
--
2.20.1
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