- There are three PHY lanes on iMX8QM, and can be
used in the following three cases
1. a two lanes PCIE_A, and a single lane SATA.
2. a single lane PCIE_A, a single lane PCIE_B
and a single lane SATA.
3. a two lanes PCIE_A, and a single lane PCIE_B.
The configuration of the iMX8QM AHCI SATA is relied
on the usage of PCIE ports in the case 1 and 2.
Use standalone iMX8 AHCI SATA probe and enable
functions to enable iMX8QM AHCI SATA support.
- To save power consumption, PHY CLKs can be gated
off after the configurations are done.
- The impedance ratio should be configured refer to
differnet REXT values.
0x6c <--> REXT valuse is 85Ohms
0x80 (default value) <--> REXT value is 100Ohms.
Signed-off-by: Richard Zhu <hongxing.zhu@xxxxxxx>
---
drivers/ata/ahci_imx.c | 332 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 332 insertions(+)
diff --git a/drivers/ata/ahci_imx.c b/drivers/ata/ahci_imx.c
index 1c69e88..cc83bea 100644
--- a/drivers/ata/ahci_imx.c
+++ b/drivers/ata/ahci_imx.c
@@ -23,6 +23,7 @@
#include <linux/regmap.h>
#include <linux/ahci_platform.h>
#include <linux/of_device.h>
+#include <linux/of_gpio.h>
#include <linux/mfd/syscon.h>
#include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
#include <linux/libata.h>
@@ -53,12 +54,49 @@ enum {
/* Clock Reset Register */
IMX_CLOCK_RESET = 0x7f3f,
IMX_CLOCK_RESET_RESET = 1 << 0,
+ /* IMX8QM HSIO AHCI definitions */
+ IMX8QM_SATA_PHY_RX_IMPED_RATIO_OFFSET = 0x03,
+ IMX8QM_SATA_PHY_TX_IMPED_RATIO_OFFSET = 0x09,
+ IMX8QM_SATA_PHY_IMPED_RATIO_85OHM = 0x6c,
+ IMX8QM_LPCG_PHYX2_OFFSET = 0x00000,
+ IMX8QM_CSR_PHYX2_OFFSET = 0x90000,
+ IMX8QM_CSR_PHYX1_OFFSET = 0xa0000,
+ IMX8QM_CSR_PHYX_STTS0_OFFSET = 0x4,
+ IMX8QM_CSR_PCIEA_OFFSET = 0xb0000,
+ IMX8QM_CSR_PCIEB_OFFSET = 0xc0000,
+ IMX8QM_CSR_SATA_OFFSET = 0xd0000,
+ IMX8QM_CSR_PCIE_CTRL2_OFFSET = 0x8,
+ IMX8QM_CSR_MISC_OFFSET = 0xe0000,
+
+ IMX8QM_LPCG_PHYX2_PCLK0_MASK = (0x3 << 16),
+ IMX8QM_LPCG_PHYX2_PCLK1_MASK = (0x3 << 20),
+ IMX8QM_PHY_APB_RSTN_0 = BIT(0),
+ IMX8QM_PHY_MODE_SATA = BIT(19),
+ IMX8QM_PHY_MODE_MASK = (0xf << 17),
+ IMX8QM_PHY_PIPE_RSTN_0 = BIT(24),
+ IMX8QM_PHY_PIPE_RSTN_OVERRIDE_0 = BIT(25),
+ IMX8QM_PHY_PIPE_RSTN_1 = BIT(26),
+ IMX8QM_PHY_PIPE_RSTN_OVERRIDE_1 = BIT(27),
+ IMX8QM_STTS0_LANE0_TX_PLL_LOCK = BIT(4),
+ IMX8QM_MISC_IOB_RXENA = BIT(0),
+ IMX8QM_MISC_IOB_TXENA = BIT(1),
+ IMX8QM_MISC_PHYX1_EPCS_SEL = BIT(12),
+ IMX8QM_MISC_CLKREQN_OUT_OVERRIDE_1 = BIT(24),
+ IMX8QM_MISC_CLKREQN_OUT_OVERRIDE_0 = BIT(25),
+ IMX8QM_MISC_CLKREQN_IN_OVERRIDE_1 = BIT(28),
+ IMX8QM_MISC_CLKREQN_IN_OVERRIDE_0 = BIT(29),
+ IMX8QM_SATA_CTRL_RESET_N = BIT(12),
+ IMX8QM_SATA_CTRL_EPCS_PHYRESET_N = BIT(7),
+ IMX8QM_CTRL_BUTTON_RST_N = BIT(21),
+ IMX8QM_CTRL_POWER_UP_RST_N = BIT(23),
+ IMX8QM_CTRL_LTSSM_ENABLE = BIT(4),
};
enum ahci_imx_type {
AHCI_IMX53,
AHCI_IMX6Q,
AHCI_IMX6QP,
+ AHCI_IMX8QM,
};
struct imx_ahci_priv {
@@ -67,10 +105,18 @@ struct imx_ahci_priv {
struct clk *sata_clk;
struct clk *sata_ref_clk;
struct clk *ahb_clk;
+ struct clk *epcs_tx_clk;
+ struct clk *epcs_rx_clk;
+ struct clk *phy_apbclk;
+ struct clk *phy_pclk0;
+ struct clk *phy_pclk1;
+ void __iomem *phy_base;
+ int clkreq_gpio;
struct regmap *gpr;
bool no_device;
bool first_time;
u32 phy_params;
+ u32 imped_ratio;
};
static int ahci_imx_hotplug;
@@ -407,6 +453,207 @@ static ssize_t sata_ahci_show_temp(struct device *dev,
};
ATTRIBUTE_GROUPS(fsl_sata_ahci);
+static int imx8_sata_enable(struct ahci_host_priv *hpriv)
+{
+ u32 val, reg;
+ int i, ret;
+ struct imx_ahci_priv *imxpriv = hpriv->plat_data;
+ struct device *dev = &imxpriv->ahci_pdev->dev;
+
+ /* configure the hsio for sata */
+ ret = clk_prepare_enable(imxpriv->phy_pclk0);
+ if (ret < 0) {
+ dev_err(dev, "can't enable phy_pclk0.\n");
+ return ret;
+ }
+ ret = clk_prepare_enable(imxpriv->phy_pclk1);
+ if (ret < 0) {
+ dev_err(dev, "can't enable phy_pclk1.\n");
+ goto disable_phy_pclk0;
+ }
+ ret = clk_prepare_enable(imxpriv->epcs_tx_clk);
+ if (ret < 0) {
+ dev_err(dev, "can't enable epcs_tx_clk.\n");
+ goto disable_phy_pclk1;
+ }
+ ret = clk_prepare_enable(imxpriv->epcs_rx_clk);
+ if (ret < 0) {
+ dev_err(dev, "can't enable epcs_rx_clk.\n");
+ goto disable_epcs_tx_clk;
+ }
+ ret = clk_prepare_enable(imxpriv->phy_apbclk);
+ if (ret < 0) {
+ dev_err(dev, "can't enable phy_apbclk.\n");
+ goto disable_epcs_rx_clk;
+ }
+ /* Configure PHYx2 PIPE_RSTN */
+ regmap_read(imxpriv->gpr, IMX8QM_CSR_PCIEA_OFFSET
+ + IMX8QM_CSR_PCIE_CTRL2_OFFSET, &val);
+ if ((val & IMX8QM_CTRL_LTSSM_ENABLE) == 0) {
+ /* The link of the PCIEA of HSIO is down */
+ regmap_update_bits(imxpriv->gpr,
+ IMX8QM_CSR_PHYX2_OFFSET,
+ IMX8QM_PHY_PIPE_RSTN_0
+ | IMX8QM_PHY_PIPE_RSTN_OVERRIDE_0,
+ IMX8QM_PHY_PIPE_RSTN_0
+ | IMX8QM_PHY_PIPE_RSTN_OVERRIDE_0);
+ }
+ regmap_read(imxpriv->gpr, IMX8QM_CSR_PCIEB_OFFSET
+ + IMX8QM_CSR_PCIE_CTRL2_OFFSET, ®);
+ if ((reg & IMX8QM_CTRL_LTSSM_ENABLE) == 0) {
+ /* The link of the PCIEB of HSIO is down */
+ regmap_update_bits(imxpriv->gpr,
+ IMX8QM_CSR_PHYX2_OFFSET,
+ IMX8QM_PHY_PIPE_RSTN_1
+ | IMX8QM_PHY_PIPE_RSTN_OVERRIDE_1,
+ IMX8QM_PHY_PIPE_RSTN_1
+ | IMX8QM_PHY_PIPE_RSTN_OVERRIDE_1);
+ }
+ if (((reg | val) & IMX8QM_CTRL_LTSSM_ENABLE) == 0) {
+ /* The links of both PCIA and PCIEB of HSIO are down */
+ regmap_update_bits(imxpriv->gpr,
+ IMX8QM_LPCG_PHYX2_OFFSET,
+ IMX8QM_LPCG_PHYX2_PCLK0_MASK
+ | IMX8QM_LPCG_PHYX2_PCLK1_MASK,
+ 0);
+ }
+
+ /* set PWR_RST and BT_RST of csr_pciea */
+ val = IMX8QM_CSR_PCIEA_OFFSET + IMX8QM_CSR_PCIE_CTRL2_OFFSET;
+ regmap_update_bits(imxpriv->gpr,
+ val,
+ IMX8QM_CTRL_BUTTON_RST_N,
+ IMX8QM_CTRL_BUTTON_RST_N);
+ regmap_update_bits(imxpriv->gpr,
+ val,
+ IMX8QM_CTRL_POWER_UP_RST_N,
+ IMX8QM_CTRL_POWER_UP_RST_N);
+
+ /* PHYX1_MODE to SATA */
+ regmap_update_bits(imxpriv->gpr,
+ IMX8QM_CSR_PHYX1_OFFSET,
+ IMX8QM_PHY_MODE_MASK,
+ IMX8QM_PHY_MODE_SATA);
+
+ /*
+ * BIT0 RXENA 1, BIT1 TXENA 0
+ * BIT12 PHY_X1_EPCS_SEL 1.
+ */
+ regmap_update_bits(imxpriv->gpr,
+ IMX8QM_CSR_MISC_OFFSET,
+ IMX8QM_MISC_IOB_RXENA,
+ IMX8QM_MISC_IOB_RXENA);
+ regmap_update_bits(imxpriv->gpr,
+ IMX8QM_CSR_MISC_OFFSET,
+ IMX8QM_MISC_IOB_TXENA,
+ 0);
+ regmap_update_bits(imxpriv->gpr,
+ IMX8QM_CSR_MISC_OFFSET,
+ IMX8QM_MISC_PHYX1_EPCS_SEL,
+ IMX8QM_MISC_PHYX1_EPCS_SEL);
+ /*
+ * It is possible, for PCIe and SATA are sharing
+ * the same clock source, HPLL or external oscillator.
+ * When PCIe is in low power modes (L1.X or L2 etc),
+ * the clock source can be turned off. In this case,
+ * if this clock source is required to be toggling by
+ * SATA, then SATA functions will be abnormal.
+ * Set the override here to avoid it.
+ */
+ regmap_update_bits(imxpriv->gpr,
+ IMX8QM_CSR_MISC_OFFSET,
+ IMX8QM_MISC_CLKREQN_OUT_OVERRIDE_1
+ | IMX8QM_MISC_CLKREQN_OUT_OVERRIDE_0
+ | IMX8QM_MISC_CLKREQN_IN_OVERRIDE_1
+ | IMX8QM_MISC_CLKREQN_IN_OVERRIDE_0,
+ IMX8QM_MISC_CLKREQN_OUT_OVERRIDE_1
+ | IMX8QM_MISC_CLKREQN_OUT_OVERRIDE_0
+ | IMX8QM_MISC_CLKREQN_IN_OVERRIDE_1
+ | IMX8QM_MISC_CLKREQN_IN_OVERRIDE_0);
+
+ /* clear PHY RST, then set it */
+ regmap_update_bits(imxpriv->gpr,
+ IMX8QM_CSR_SATA_OFFSET,
+ IMX8QM_SATA_CTRL_EPCS_PHYRESET_N,
+ 0);
+
+ regmap_update_bits(imxpriv->gpr,
+ IMX8QM_CSR_SATA_OFFSET,
+ IMX8QM_SATA_CTRL_EPCS_PHYRESET_N,
+ IMX8QM_SATA_CTRL_EPCS_PHYRESET_N);
+
+ /* CTRL RST: SET -> delay 1 us -> CLEAR -> SET */
+ regmap_update_bits(imxpriv->gpr,
+ IMX8QM_CSR_SATA_OFFSET,
+ IMX8QM_SATA_CTRL_RESET_N,
+ IMX8QM_SATA_CTRL_RESET_N);
+ udelay(1);
+ regmap_update_bits(imxpriv->gpr,
+ IMX8QM_CSR_SATA_OFFSET,
+ IMX8QM_SATA_CTRL_RESET_N,
+ 0);
+ regmap_update_bits(imxpriv->gpr,
+ IMX8QM_CSR_SATA_OFFSET,
+ IMX8QM_SATA_CTRL_RESET_N,
+ IMX8QM_SATA_CTRL_RESET_N);
+
+ /* APB reset */
+ regmap_update_bits(imxpriv->gpr,
+ IMX8QM_CSR_PHYX1_OFFSET,
+ IMX8QM_PHY_APB_RSTN_0,
+ IMX8QM_PHY_APB_RSTN_0);
+
+ for (i = 0; i < 100; i++) {
+ reg = IMX8QM_CSR_PHYX1_OFFSET
+ + IMX8QM_CSR_PHYX_STTS0_OFFSET;
+ regmap_read(imxpriv->gpr, reg, &val);
+ val &= IMX8QM_STTS0_LANE0_TX_PLL_LOCK;
+ if (val == IMX8QM_STTS0_LANE0_TX_PLL_LOCK)
+ break;
+ udelay(1);
+ }
+
+ if (val != IMX8QM_STTS0_LANE0_TX_PLL_LOCK) {
+ dev_err(dev, "TX PLL of the PHY is not locked\n");
+ ret = -ENODEV;
+ } else {
+ writeb(imxpriv->imped_ratio, imxpriv->phy_base
+ + IMX8QM_SATA_PHY_RX_IMPED_RATIO_OFFSET);
+ writeb(imxpriv->imped_ratio, imxpriv->phy_base
+ + IMX8QM_SATA_PHY_TX_IMPED_RATIO_OFFSET);
+ reg = readb(imxpriv->phy_base
+ + IMX8QM_SATA_PHY_RX_IMPED_RATIO_OFFSET);
+ if (unlikely(reg != imxpriv->imped_ratio))
+ dev_info(dev, "Can't set PHY RX impedance ratio.\n");
+ reg = readb(imxpriv->phy_base
+ + IMX8QM_SATA_PHY_TX_IMPED_RATIO_OFFSET);
+ if (unlikely(reg != imxpriv->imped_ratio))
+ dev_info(dev, "Can't set PHY TX impedance ratio.\n");
+ usleep_range(50, 100);
+
+ /*
+ * To reduce the power consumption, gate off
+ * the PHY clks
+ */
+ clk_disable_unprepare(imxpriv->phy_apbclk);
+ clk_disable_unprepare(imxpriv->phy_pclk1);
+ clk_disable_unprepare(imxpriv->phy_pclk0);
+ return ret;
+ }
+
+ clk_disable_unprepare(imxpriv->phy_apbclk);
+disable_epcs_rx_clk:
+ clk_disable_unprepare(imxpriv->epcs_rx_clk);
+disable_epcs_tx_clk:
+ clk_disable_unprepare(imxpriv->epcs_tx_clk);
+disable_phy_pclk1:
+ clk_disable_unprepare(imxpriv->phy_pclk1);
+disable_phy_pclk0:
+ clk_disable_unprepare(imxpriv->phy_pclk0);
+
+ return ret;
+}
+
static int imx_sata_enable(struct ahci_host_priv *hpriv)
{
struct imx_ahci_priv *imxpriv = hpriv->plat_data;
@@ -454,6 +701,8 @@ static int imx_sata_enable(struct ahci_host_priv *hpriv)
dev_err(dev, "failed to reset phy: %d\n", ret);
goto disable_clk;
}
+ } else if (imxpriv->type == AHCI_IMX8QM) {
+ ret = imx8_sata_enable(hpriv);
}
usleep_range(1000, 2000);
@@ -491,6 +740,11 @@ static void imx_sata_disable(struct ahci_host_priv *hpriv)
!IMX6Q_GPR13_SATA_MPLL_CLK_EN);
break;
+ case AHCI_IMX8QM:
+ clk_disable_unprepare(imxpriv->epcs_rx_clk);
+ clk_disable_unprepare(imxpriv->epcs_tx_clk);
+ break;
+
default:
break;
}
@@ -567,6 +821,7 @@ static int ahci_imx_softreset(struct ata_link *link, unsigned int *class,
{ .compatible = "fsl,imx53-ahci", .data = (void *)AHCI_IMX53 },
{ .compatible = "fsl,imx6q-ahci", .data = (void *)AHCI_IMX6Q },
{ .compatible = "fsl,imx6qp-ahci", .data = (void *)AHCI_IMX6QP },
+ { .compatible = "fsl,imx8qm-ahci", .data = (void *)AHCI_IMX8QM },
{},
};
MODULE_DEVICE_TABLE(of, imx_ahci_of_match);
@@ -734,6 +989,79 @@ static u32 imx_ahci_parse_props(struct device *dev,
AHCI_SHT(DRV_NAME),
};
+static int imx8_sata_probe(struct device *dev, struct imx_ahci_priv *imxpriv)
+{
+ int ret;
+ struct resource *phy_res;
+ struct platform_device *pdev = imxpriv->ahci_pdev;
+ struct device_node *np = dev->of_node;
+
+ if (of_property_read_u32(np, "fsl,phy-imp", &imxpriv->imped_ratio))
+ imxpriv->imped_ratio = IMX8QM_SATA_PHY_IMPED_RATIO_85OHM;
+ phy_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy");
+ if (phy_res) {
+ imxpriv->phy_base = devm_ioremap(dev, phy_res->start,
+ resource_size(phy_res));
+ if (!imxpriv->phy_base) {
+ dev_err(dev, "error with ioremap\n");
+ return -ENOMEM;
+ }
+ } else {
+ dev_err(dev, "missing *phy* reg region.\n");
+ return -ENOMEM;
+ }
+ imxpriv->gpr =
+ syscon_regmap_lookup_by_phandle(np, "hsio");
+ if (IS_ERR(imxpriv->gpr)) {
+ dev_err(dev, "unable to find gpr registers\n");
+ return PTR_ERR(imxpriv->gpr);
+ }
+
+ imxpriv->epcs_tx_clk = devm_clk_get(dev, "epcs_tx");
+ if (IS_ERR(imxpriv->epcs_tx_clk)) {
+ dev_err(dev, "can't get epcs_tx_clk clock.\n");
+ return PTR_ERR(imxpriv->epcs_tx_clk);
+ }
+ imxpriv->epcs_rx_clk = devm_clk_get(dev, "epcs_rx");
+ if (IS_ERR(imxpriv->epcs_rx_clk)) {
+ dev_err(dev, "can't get epcs_rx_clk clock.\n");
+ return PTR_ERR(imxpriv->epcs_rx_clk);
+ }
+ imxpriv->phy_pclk0 = devm_clk_get(dev, "phy_pclk0");
+ if (IS_ERR(imxpriv->phy_pclk0)) {
+ dev_err(dev, "can't get phy_pclk0 clock.\n");
+ return PTR_ERR(imxpriv->phy_pclk0);
+ }
+ imxpriv->phy_pclk1 = devm_clk_get(dev, "phy_pclk1");
+ if (IS_ERR(imxpriv->phy_pclk1)) {
+ dev_err(dev, "can't get phy_pclk1 clock.\n");
+ return PTR_ERR(imxpriv->phy_pclk1);
+ }
+ imxpriv->phy_apbclk = devm_clk_get(dev, "phy_apbclk");
+ if (IS_ERR(imxpriv->phy_apbclk)) {
+ dev_err(dev, "can't get phy_apbclk clock.\n");
+ return PTR_ERR(imxpriv->phy_apbclk);
+ }
+
+ /* Fetch GPIO, then enable the external OSC */
+ imxpriv->clkreq_gpio = of_get_named_gpio(np, "clkreq-gpio", 0);
+ if (gpio_is_valid(imxpriv->clkreq_gpio)) {
+ ret = devm_gpio_request_one(dev, imxpriv->clkreq_gpio,
+ GPIOF_OUT_INIT_LOW,
+ "SATA CLKREQ");
+ if (ret == -EBUSY) {
+ dev_info(dev, "clkreq had been initialized.\n");
+ } else if (ret) {
+ dev_err(dev, "%d unable to get clkreq.\n", ret);
+ return ret;
+ }
+ } else if (imxpriv->clkreq_gpio == -EPROBE_DEFER) {
+ return imxpriv->clkreq_gpio;
+ }
+
+ return 0;
+}
+
static int imx_ahci_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -793,6 +1121,10 @@ static int imx_ahci_probe(struct platform_device *pdev)
IMX6Q_GPR13_SATA_RX_DPLL_MODE_2P_4F |
IMX6Q_GPR13_SATA_SPD_MODE_3P0G |
reg_value;
+ } else if (imxpriv->type == AHCI_IMX8QM) {
+ ret = imx8_sata_probe(dev, imxpriv);
+ if (ret)
+ return ret;
}
hpriv = ahci_platform_get_resources(pdev);
--
1.9.1
--
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