Re: [PATCH RFC v3 5/6] phy: mvebu-cp110-utmi: add support for armada-380 utmi phys

From: Josua Mayer
Date: Thu Jul 25 2024 - 04:38:35 EST

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In reply to: Vinod Koul: "Re: [PATCH RFC v3 5/6] phy: mvebu-cp110-utmi: add support for armada-380 utmi phys"
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Am 25.07.24 um 08:43 schrieb Vinod Koul:
> On 20-07-24, 16:19, Josua Mayer wrote:
>> Armada 380 has similar USB-2.0 PHYs as CP-110. The differences are:
>> - register base addresses
>> - gap between port registers
>> - number of ports: 388 has three, cp110 two
>> - device-mode mux bit refers to different ports
>> - syscon register's base address (offsets identical)
>> - armada-8k uses syscon for various drivers, a38x not
>>
>> Differentiation uses of_match_data with distinct compatible strings.
>>
>> Add support for Armada 380 PHYs by partially restructuting the driver:
>> - Port register pointers are moved to the per-port private data.
>> - Add armada-38x-specific compatible string and store enum value in
>> of_match_data for differentiation.
>> - Add support for optional regs usb-cfg and utmi-cfg, to be used instead
>> of syscon.
>>
>> Signed-off-by: Josua Mayer <josua@xxxxxxxxxxxxx>
>> ---
>> drivers/phy/marvell/phy-mvebu-cp110-utmi.c | 209 +++++++++++++++++++++++------
>> 1 file changed, 166 insertions(+), 43 deletions(-)
>>
>> diff --git a/drivers/phy/marvell/phy-mvebu-cp110-utmi.c b/drivers/phy/marvell/phy-mvebu-cp110-utmi.c
>> index 4922a5f3327d..4341923e85bc 100644
>> --- a/drivers/phy/marvell/phy-mvebu-cp110-utmi.c
>> +++ b/drivers/phy/marvell/phy-mvebu-cp110-utmi.c
>> @@ -19,7 +19,7 @@
>> #include <linux/usb/of.h>
>> #include <linux/usb/otg.h>
>>
>> -#define UTMI_PHY_PORTS 2
>> +#define UTMI_PHY_PORTS 3
>>
>> /* CP110 UTMI register macro definetions */
>> #define SYSCON_USB_CFG_REG 0x420
>> @@ -76,32 +76,44 @@
>> #define PLL_LOCK_DELAY_US 10000
>> #define PLL_LOCK_TIMEOUT_US 1000000
>>
>> -#define PORT_REGS(p) ((p)->priv->regs + (p)->id * 0x1000)
>> +enum mvebu_cp110_utmi_type {
>> + /* 0 is reserved to avoid clashing with NULL */
>> + A380_UTMI = 1,
>> + CP110_UTMI = 2,
>> +};
>> +
>> +struct mvebu_cp110_utmi_port;
> why forward declare and not move the structs instead?
Seemed like the smaller change / more readable as diff.
I can move the struct instead!
>
>>
>> /**
>> * struct mvebu_cp110_utmi - PHY driver data
>> *
>> - * @regs: PHY registers
>> + * @regs_usb: USB configuration register
>> * @syscon: Regmap with system controller registers
>> * @dev: device driver handle
>> * @ops: phy ops
>> + * @ports: phy object for each port
>> */
>> struct mvebu_cp110_utmi {
>> - void __iomem *regs;
>> + void __iomem *regs_usb;
>> struct regmap *syscon;
>> struct device *dev;
>> const struct phy_ops *ops;
>> + struct mvebu_cp110_utmi_port *ports[UTMI_PHY_PORTS];
>> };
>>
>> /**
>> * struct mvebu_cp110_utmi_port - PHY port data
>> *
>> + * @regs: PHY registers
>> + * @regs_cfg: PHY config register
>> * @priv: PHY driver data
>> * @id: PHY port ID
>> * @dr_mode: PHY connection: USB_DR_MODE_HOST or USB_DR_MODE_PERIPHERAL
>> */
>> struct mvebu_cp110_utmi_port {
>> struct mvebu_cp110_utmi *priv;
>> + void __iomem *regs;
>> + void __iomem *regs_cfg;
>> u32 id;
>> enum usb_dr_mode dr_mode;
>> };
>> @@ -118,47 +130,47 @@ static void mvebu_cp110_utmi_port_setup(struct mvebu_cp110_utmi_port *port)
>> * The crystal used for all platform boards is now 25MHz.
>> * See the functional specification for details.
>> */
>> - reg = readl(PORT_REGS(port) + UTMI_PLL_CTRL_REG);
>> + reg = readl(port->regs + UTMI_PLL_CTRL_REG);
> why not handle this as a preparatory patch for this? Helps in review

Will do!

>
>> reg &= ~(PLL_REFDIV_MASK | PLL_FBDIV_MASK | PLL_SEL_LPFR_MASK);
>> reg |= (PLL_REFDIV_VAL << PLL_REFDIV_OFFSET) |
>> (PLL_FBDIV_VAL << PLL_FBDIV_OFFSET);
>> - writel(reg, PORT_REGS(port) + UTMI_PLL_CTRL_REG);
>> + writel(reg, port->regs + UTMI_PLL_CTRL_REG);
>>
>> /* Impedance Calibration Threshold Setting */
>> - reg = readl(PORT_REGS(port) + UTMI_CAL_CTRL_REG);
>> + reg = readl(port->regs + UTMI_CAL_CTRL_REG);
>> reg &= ~IMPCAL_VTH_MASK;
>> reg |= IMPCAL_VTH_VAL << IMPCAL_VTH_OFFSET;
>> - writel(reg, PORT_REGS(port) + UTMI_CAL_CTRL_REG);
>> + writel(reg, port->regs + UTMI_CAL_CTRL_REG);
>>
>> /* Set LS TX driver strength coarse control */
>> - reg = readl(PORT_REGS(port) + UTMI_TX_CH_CTRL_REG);
>> + reg = readl(port->regs + UTMI_TX_CH_CTRL_REG);
>> reg &= ~TX_AMP_MASK;
>> reg |= TX_AMP_VAL << TX_AMP_OFFSET;
>> - writel(reg, PORT_REGS(port) + UTMI_TX_CH_CTRL_REG);
>> + writel(reg, port->regs + UTMI_TX_CH_CTRL_REG);
>>
>> /* Disable SQ and enable analog squelch detect */
>> - reg = readl(PORT_REGS(port) + UTMI_RX_CH_CTRL0_REG);
>> + reg = readl(port->regs + UTMI_RX_CH_CTRL0_REG);
>> reg &= ~SQ_DET_EN;
>> reg |= SQ_ANA_DTC_SEL;
>> - writel(reg, PORT_REGS(port) + UTMI_RX_CH_CTRL0_REG);
>> + writel(reg, port->regs + UTMI_RX_CH_CTRL0_REG);
>>
>> /*
>> * Set External squelch calibration number and
>> * enable the External squelch calibration
>> */
>> - reg = readl(PORT_REGS(port) + UTMI_RX_CH_CTRL1_REG);
>> + reg = readl(port->regs + UTMI_RX_CH_CTRL1_REG);
>> reg &= ~SQ_AMP_CAL_MASK;
>> reg |= (SQ_AMP_CAL_VAL << SQ_AMP_CAL_OFFSET) | SQ_AMP_CAL_EN;
>> - writel(reg, PORT_REGS(port) + UTMI_RX_CH_CTRL1_REG);
>> + writel(reg, port->regs + UTMI_RX_CH_CTRL1_REG);
>>
>> /*
>> * Set Control VDAT Reference Voltage - 0.325V and
>> * Control VSRC Reference Voltage - 0.6V
>> */
>> - reg = readl(PORT_REGS(port) + UTMI_CHGDTC_CTRL_REG);
>> + reg = readl(port->regs + UTMI_CHGDTC_CTRL_REG);
>> reg &= ~(VDAT_MASK | VSRC_MASK);
>> reg |= (VDAT_VAL << VDAT_OFFSET) | (VSRC_VAL << VSRC_OFFSET);
>> - writel(reg, PORT_REGS(port) + UTMI_CHGDTC_CTRL_REG);
>> + writel(reg, port->regs + UTMI_CHGDTC_CTRL_REG);
>> }
>>
>> static int mvebu_cp110_utmi_phy_power_off(struct phy *phy)
>> @@ -166,22 +178,38 @@ static int mvebu_cp110_utmi_phy_power_off(struct phy *phy)
>> struct mvebu_cp110_utmi_port *port = phy_get_drvdata(phy);
>> struct mvebu_cp110_utmi *utmi = port->priv;
>> int i;
>> + int reg;
>>
>> /* Power down UTMI PHY port */
>> - regmap_clear_bits(utmi->syscon, SYSCON_UTMI_CFG_REG(port->id),
>> - UTMI_PHY_CFG_PU_MASK);
>> + if (!IS_ERR(port->regs_cfg)) {
>> + reg = readl(port->regs_cfg);
>> + reg &= ~(UTMI_PHY_CFG_PU_MASK);
>> + writel(reg, port->regs_cfg);
>> + } else
>> + regmap_clear_bits(utmi->syscon, SYSCON_UTMI_CFG_REG(port->id),
>> + UTMI_PHY_CFG_PU_MASK);
> why are we doing both raw register read/write and regmap ops... that
> does not sound correct to me
Indeed.

The next question would be why for Armada 8K / CP110 syscon was chosen.
From what I could find the registers accessed by utmi driver
are not accessed by other drivers.

I am adding raw register access as an alternative,

to keep supporting old device-tree specifying syscon handle.

I considered writing helper functions for the if-not-error-syscon-else-raw,
but between set_bits, clear_bits, global and per-port regs
would have ended up with too many.

>
>>
>> for (i = 0; i < UTMI_PHY_PORTS; i++) {
>> - int test = regmap_test_bits(utmi->syscon,
>> - SYSCON_UTMI_CFG_REG(i),
>> - UTMI_PHY_CFG_PU_MASK);
>> + if (!utmi->ports[i])
>> + continue;
>> +
>> + if (!IS_ERR(utmi->ports[i]->regs_cfg))
>> + reg = readl(utmi->ports[i]->regs_cfg);
>> + else
>> + regmap_read(utmi->syscon, SYSCON_UTMI_CFG_REG(i), &reg);
>> + int test = reg & UTMI_PHY_CFG_PU_MASK;
>> /* skip PLL shutdown if there are active UTMI PHY ports */
>> if (test != 0)
>> return 0;
>> }
>>
>> /* PLL Power down if all UTMI PHYs are down */
>> - regmap_clear_bits(utmi->syscon, SYSCON_USB_CFG_REG, USB_CFG_PLL_MASK);
>> + if (!IS_ERR(utmi->regs_usb)) {
>> + reg = readl(utmi->regs_usb);
>> + reg &= ~(USB_CFG_PLL_MASK);
>> + writel(reg, utmi->regs_usb);
>> + } else
>> + regmap_clear_bits(utmi->syscon, SYSCON_USB_CFG_REG, USB_CFG_PLL_MASK);
>>
>> return 0;
>> }
>> @@ -191,8 +219,15 @@ static int mvebu_cp110_utmi_phy_power_on(struct phy *phy)
>> struct mvebu_cp110_utmi_port *port = phy_get_drvdata(phy);
>> struct mvebu_cp110_utmi *utmi = port->priv;
>> struct device *dev = &phy->dev;
>> + const void *match;
>> + enum mvebu_cp110_utmi_type type;
>> int ret;
>> u32 reg;
>> + u32 sel;
>> +
>> + match = device_get_match_data(utmi->dev);
>> + if (match)
>> + type = (enum mvebu_cp110_utmi_type)(uintptr_t)match;
>>
>> /* It is necessary to power off UTMI before configuration */
>> ret = mvebu_cp110_utmi_phy_power_off(phy);
>> @@ -208,16 +243,45 @@ static int mvebu_cp110_utmi_phy_power_on(struct phy *phy)
>> * to UTMI0 or to UTMI1 PHY port, but not to both.
>> */
>> if (port->dr_mode == USB_DR_MODE_PERIPHERAL) {
>> - regmap_update_bits(utmi->syscon, SYSCON_USB_CFG_REG,
>> - USB_CFG_DEVICE_EN_MASK | USB_CFG_DEVICE_MUX_MASK,
>> - USB_CFG_DEVICE_EN_MASK |
>> - (port->id << USB_CFG_DEVICE_MUX_OFFSET));
>> + switch (type) {
>> + case A380_UTMI:
>> + /*
>> + * A380 muxes between ports 0/2:
>> + * - 0: Device mode on Port 2
>> + * - 1: Device mode on Port 0
>> + */
>> + if (port->id == 1)
>> + return -EINVAL;
>> + sel = !!(port->id == 0);
>> + break;
>> + case CP110_UTMI:
>> + /*
>> + * CP110 muxes between ports 0/1:
>> + * - 0: Device mode on Port 0
>> + * - 1: Device mode on Port 1
>> + */
>> + sel = port->id;
>> + break;
>> + default:
>> + return -EINVAL;
>> + }
>> + if (!IS_ERR(utmi->regs_usb)) {
>> + reg = readl(utmi->regs_usb);
>> + reg &= ~(USB_CFG_DEVICE_EN_MASK | USB_CFG_DEVICE_MUX_MASK);
>> + reg |= USB_CFG_DEVICE_EN_MASK;
>> + reg |= (sel << USB_CFG_DEVICE_MUX_OFFSET);
>> + writel(reg, utmi->regs_usb);
>> + } else
>> + regmap_update_bits(utmi->syscon, SYSCON_USB_CFG_REG,
>> + USB_CFG_DEVICE_EN_MASK | USB_CFG_DEVICE_MUX_MASK,
>> + USB_CFG_DEVICE_EN_MASK |
>> + (sel << USB_CFG_DEVICE_MUX_OFFSET));
>> }
>>
>> /* Set Test suspendm mode and enable Test UTMI select */
>> - reg = readl(PORT_REGS(port) + UTMI_CTRL_STATUS0_REG);
>> + reg = readl(port->regs + UTMI_CTRL_STATUS0_REG);
>> reg |= SUSPENDM | TEST_SEL;
>> - writel(reg, PORT_REGS(port) + UTMI_CTRL_STATUS0_REG);
>> + writel(reg, port->regs + UTMI_CTRL_STATUS0_REG);
>>
>> /* Wait for UTMI power down */
>> mdelay(1);
>> @@ -226,16 +290,21 @@ static int mvebu_cp110_utmi_phy_power_on(struct phy *phy)
>> mvebu_cp110_utmi_port_setup(port);
>>
>> /* Power UP UTMI PHY */
>> - regmap_set_bits(utmi->syscon, SYSCON_UTMI_CFG_REG(port->id),
>> - UTMI_PHY_CFG_PU_MASK);
>> + if (!IS_ERR(port->regs_cfg)) {
>> + reg = readl(port->regs_cfg);
>> + reg |= UTMI_PHY_CFG_PU_MASK;
>> + writel(reg, port->regs_cfg);
>> + } else
>> + regmap_set_bits(utmi->syscon, SYSCON_UTMI_CFG_REG(port->id),
>> + UTMI_PHY_CFG_PU_MASK);
>>
>> /* Disable Test UTMI select */
>> - reg = readl(PORT_REGS(port) + UTMI_CTRL_STATUS0_REG);
>> + reg = readl(port->regs + UTMI_CTRL_STATUS0_REG);
>> reg &= ~TEST_SEL;
>> - writel(reg, PORT_REGS(port) + UTMI_CTRL_STATUS0_REG);
>> + writel(reg, port->regs + UTMI_CTRL_STATUS0_REG);
>>
>> /* Wait for impedance calibration */
>> - ret = readl_poll_timeout(PORT_REGS(port) + UTMI_CAL_CTRL_REG, reg,
>> + ret = readl_poll_timeout(port->regs + UTMI_CAL_CTRL_REG, reg,
>> reg & IMPCAL_DONE,
>> PLL_LOCK_DELAY_US, PLL_LOCK_TIMEOUT_US);
>> if (ret) {
>> @@ -244,7 +313,7 @@ static int mvebu_cp110_utmi_phy_power_on(struct phy *phy)
>> }
>>
>> /* Wait for PLL calibration */
>> - ret = readl_poll_timeout(PORT_REGS(port) + UTMI_CAL_CTRL_REG, reg,
>> + ret = readl_poll_timeout(port->regs + UTMI_CAL_CTRL_REG, reg,
>> reg & PLLCAL_DONE,
>> PLL_LOCK_DELAY_US, PLL_LOCK_TIMEOUT_US);
>> if (ret) {
>> @@ -253,7 +322,7 @@ static int mvebu_cp110_utmi_phy_power_on(struct phy *phy)
>> }
>>
>> /* Wait for PLL ready */
>> - ret = readl_poll_timeout(PORT_REGS(port) + UTMI_PLL_CTRL_REG, reg,
>> + ret = readl_poll_timeout(port->regs + UTMI_PLL_CTRL_REG, reg,
>> reg & PLL_RDY,
>> PLL_LOCK_DELAY_US, PLL_LOCK_TIMEOUT_US);
>> if (ret) {
>> @@ -262,7 +331,12 @@ static int mvebu_cp110_utmi_phy_power_on(struct phy *phy)
>> }
>>
>> /* PLL Power up */
>> - regmap_set_bits(utmi->syscon, SYSCON_USB_CFG_REG, USB_CFG_PLL_MASK);
>> + if (!IS_ERR(utmi->regs_usb)) {
>> + reg = readl(utmi->regs_usb);
>> + reg |= USB_CFG_PLL_MASK;
>> + writel(reg, utmi->regs_usb);
>> + } else
>> + regmap_set_bits(utmi->syscon, SYSCON_USB_CFG_REG, USB_CFG_PLL_MASK);
>>
>> return 0;
>> }
>> @@ -274,7 +348,8 @@ static const struct phy_ops mvebu_cp110_utmi_phy_ops = {
>> };
>>
>> static const struct of_device_id mvebu_cp110_utmi_of_match[] = {
>> - { .compatible = "marvell,cp110-utmi-phy" },
>> + { .compatible = "marvell,a38x-utmi-phy", .data = (void *)A380_UTMI },
>> + { .compatible = "marvell,cp110-utmi-phy", .data = (void *)CP110_UTMI },
> Cast to void * are not required to be done
Ack.
>
>> {},
>> };
>> MODULE_DEVICE_TABLE(of, mvebu_cp110_utmi_of_match);
>> @@ -285,6 +360,10 @@ static int mvebu_cp110_utmi_phy_probe(struct platform_device *pdev)
>> struct mvebu_cp110_utmi *utmi;
>> struct phy_provider *provider;
>> struct device_node *child;
>> + void __iomem *regs_utmi;
>> + void __iomem *regs_utmi_cfg;
>> + const void *match;
>> + enum mvebu_cp110_utmi_type type;
>> u32 usb_devices = 0;
>>
>> utmi = devm_kzalloc(dev, sizeof(*utmi), GFP_KERNEL);
>> @@ -293,18 +372,44 @@ static int mvebu_cp110_utmi_phy_probe(struct platform_device *pdev)
>>
>> utmi->dev = dev;
>>
>> + match = device_get_match_data(dev);
>> + if (match)
>> + type = (enum mvebu_cp110_utmi_type)(uintptr_t)match;
>> +
>> + /* Get UTMI memory region */
>> + regs_utmi = devm_platform_ioremap_resource(pdev, 0);
>> + if (IS_ERR(regs_utmi)) {
>> + dev_err(dev, "Failed to map utmi regs\n");
>> + return PTR_ERR(regs_utmi);
>> + }
>> +
>> + /* Get usb config region */
>> + utmi->regs_usb = devm_platform_ioremap_resource_byname(pdev, "usb-cfg");
>> + if (IS_ERR(utmi->regs_usb) && PTR_ERR(utmi->regs_usb) != -EINVAL) {
>> + dev_err(dev, "Failed to map usb config regs\n");
>> + return PTR_ERR(utmi->regs_usb);
>> + }
>> +
>> + /* Get utmi config region */
>> + regs_utmi_cfg = devm_platform_ioremap_resource_byname(pdev, "utmi-cfg");
>> + if (IS_ERR(regs_utmi_cfg) && PTR_ERR(regs_utmi_cfg) != -EINVAL) {
>> + dev_err(dev, "Failed to map usb config regs\n");
>> + return PTR_ERR(regs_utmi_cfg);
>> + }
>> +
>> /* Get system controller region */
>> utmi->syscon = syscon_regmap_lookup_by_phandle(dev->of_node,
>> "marvell,system-controller");
>> - if (IS_ERR(utmi->syscon)) {
>> - dev_err(dev, "Missing UTMI system controller\n");
>> + if (IS_ERR(utmi->syscon) && PTR_ERR(utmi->syscon) != -ENODEV) {
>> + dev_err(dev, "Failed to get system controller\n");
>> return PTR_ERR(utmi->syscon);
>> }
>>
>> - /* Get UTMI memory region */
>> - utmi->regs = devm_platform_ioremap_resource(pdev, 0);
>> - if (IS_ERR(utmi->regs))
>> - return PTR_ERR(utmi->regs);
>> + if (IS_ERR(utmi->syscon) &&
>> + (IS_ERR(utmi->regs_usb) || IS_ERR(regs_utmi_cfg))) {
>> + dev_err(dev, "Missing utmi system controller or config regs");
>> + return -EINVAL;
>> + }
>>
>> for_each_available_child_of_node(dev->of_node, child) {
>> struct mvebu_cp110_utmi_port *port;
>> @@ -326,6 +431,24 @@ static int mvebu_cp110_utmi_phy_probe(struct platform_device *pdev)
>> return -ENOMEM;
>> }
>>
>> + utmi->ports[port_id] = port;
>> +
>> + /* Get port memory region */
>> + switch (type) {
>> + case A380_UTMI:
>> + port->regs = regs_utmi + port_id * 0x1000;
>> + break;
>> + case CP110_UTMI:
>> + port->regs = regs_utmi + port_id * 0x2000;
>> + break;
>> + default:
>> + return -EINVAL;
>> + }
>> +
>> + /* assign utmi cfg reg */
>> + if (!IS_ERR(regs_utmi_cfg))
>> + port->regs_cfg = regs_utmi_cfg + port_id * 4;
>> +
>> port->dr_mode = of_usb_get_dr_mode_by_phy(child, -1);
>> if ((port->dr_mode != USB_DR_MODE_HOST) &&
>> (port->dr_mode != USB_DR_MODE_PERIPHERAL)) {
>>
>> --
>> 2.43.0

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In reply to: Vinod Koul: "Re: [PATCH RFC v3 5/6] phy: mvebu-cp110-utmi: add support for armada-380 utmi phys"
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