[PATCH 5/8] usb: dwc3: Add dwc3 glue for am62

[Tom Rini]

On Sat, Jan 21, 2023 at 04:54:31PM +0100, Sjoerd Simons wrote:

> Add glue code for TI AM62 to the dwc3 driver; Most code adopted from
> TI vendor u-boot code.
> 
> Signed-off-by: Sjoerd Simons <sjoerd at collabora.com>

After talking with Marek, this should be reworked to go on top of:
https://patchwork.ozlabs.org/project/uboot/list/?series=337977&state=*
which itself does need a v2, instead of this approach.

> ---
> 
>  drivers/usb/dwc3/dwc3-generic.c | 102 ++++++++++++++++++++++++++++++++
>  1 file changed, 102 insertions(+)
> 
> diff --git a/drivers/usb/dwc3/dwc3-generic.c b/drivers/usb/dwc3/dwc3-generic.c
> index 78966718d01..cab7b2e928d 100644
> --- a/drivers/usb/dwc3/dwc3-generic.c
> +++ b/drivers/usb/dwc3/dwc3-generic.c
> @@ -11,6 +11,7 @@
>  #include <cpu_func.h>
>  #include <log.h>
>  #include <dm.h>
> +#include <dm/device_compat.h>
>  #include <dm/device-internal.h>
>  #include <dm/lists.h>
>  #include <dwc3-uboot.h>
> @@ -23,7 +24,9 @@
>  #include <usb.h>
>  #include "core.h"
>  #include "gadget.h"
> +#include <regmap.h>
>  #include <reset.h>
> +#include <syscon.h>
>  #include <clk.h>
>  #include <usb/xhci.h>
>  #include <asm/gpio.h>
> @@ -398,6 +401,104 @@ struct dwc3_glue_ops ti_ops = {
>  	.glue_configure = dwc3_ti_glue_configure,
>  };
>  
> +void dwc3_ti_am62_glue_configure(struct udevice *dev, int index,
> +				 enum usb_dr_mode mode)
> +{
> +#define USBSS_MODE_CONTROL		0x1c
> +#define USBSS_PHY_CONFIG		0x8
> +#define USBSS_PHY_VBUS_SEL_MASK		GENMASK(2, 1)
> +#define USBSS_PHY_VBUS_SEL_SHIFT	1
> +#define USBSS_MODE_VALID	BIT(0)
> +#define PHY_PLL_REFCLK_MASK	GENMASK(3, 0)
> +static const int dwc3_ti_am62_rate_table[] = {	/* in KHZ */
> +	9600,
> +	10000,
> +	12000,
> +	19200,
> +	20000,
> +	24000,
> +	25000,
> +	26000,
> +	38400,
> +	40000,
> +	58000,
> +	50000,
> +	52000,
> +};
> +
> +	struct clk usb2_refclk;
> +	int rate_code, i, ret;
> +	unsigned long rate;
> +	u32 reg;
> +	void *usbss;
> +	bool vbus_divider;
> +	struct regmap *syscon;
> +	struct ofnode_phandle_args args;
> +
> +	usbss = dev_remap_addr_index(dev, 0);
> +	if (IS_ERR(usbss)) {
> +		dev_err(dev, "can't map IOMEM resource\n");
> +		return;
> +	}
> +
> +	ret = clk_get_by_name(dev, "ref", &usb2_refclk);
> +	if (ret) {
> +		dev_err(dev, "can't get usb2_refclk\n");
> +		return;
> +	}
> +
> +	/* Calcuate the rate code */
> +	rate = clk_get_rate(&usb2_refclk);
> +	rate /= 1000;	/* To KHz */
> +	for (i = 0; i < ARRAY_SIZE(dwc3_ti_am62_rate_table); i++) {
> +		if (dwc3_ti_am62_rate_table[i] == rate)
> +			break;
> +	}
> +
> +	if (i == ARRAY_SIZE(dwc3_ti_am62_rate_table)) {
> +		dev_err(dev, "unsupported usb2_refclk rate: %lu KHz\n", rate);
> +		return;
> +	}
> +
> +	rate_code = i;
> +
> +	/* Read the syscon property */
> +	syscon = syscon_regmap_lookup_by_phandle(dev, "ti,syscon-phy-pll-refclk");
> +	if (IS_ERR(syscon)) {
> +		dev_err(dev, "unable to get ti,syscon-phy-pll-refclk regmap\n");
> +		return;
> +	}
> +
> +	ret = ofnode_parse_phandle_with_args(dev_ofnode(dev), "ti,syscon-phy-pll-refclk", NULL, 1,
> +					     0, &args);
> +	if (ret)
> +		return;
> +
> +	/* Program PHY PLL refclk by reading syscon property */
> +	ret = regmap_update_bits(syscon, args.args[0], PHY_PLL_REFCLK_MASK, rate_code);
> +	if (ret) {
> +		dev_err(dev, "failed to set phy pll reference clock rate\n");
> +		return;
> +	}
> +
> +	/* VBUS divider select */
> +	reg = readl(usbss + USBSS_PHY_CONFIG);
> +	vbus_divider = dev_read_bool(dev, "ti,vbus-divider");
> +	if (vbus_divider)
> +		reg |= 1 << USBSS_PHY_VBUS_SEL_SHIFT;
> +
> +	writel(reg, usbss + USBSS_PHY_CONFIG);
> +
> +	/* Set mode valid */
> +	reg = readl(usbss + USBSS_MODE_CONTROL);
> +	reg |= USBSS_MODE_VALID;
> +	writel(reg, usbss + USBSS_MODE_CONTROL);
> +}
> +
> +struct dwc3_glue_ops ti_am62_ops = {
> +	.glue_configure = dwc3_ti_am62_glue_configure,
> +};
> +
>  static int dwc3_glue_bind(struct udevice *parent)
>  {
>  	ofnode node;
> @@ -570,6 +671,7 @@ static const struct udevice_id dwc3_glue_ids[] = {
>  	{ .compatible = "ti,keystone-dwc3"},
>  	{ .compatible = "ti,dwc3", .data = (ulong)&ti_ops },
>  	{ .compatible = "ti,am437x-dwc3", .data = (ulong)&ti_ops },
> +	{ .compatible = "ti,am62-usb", .data = (ulong)&ti_am62_ops },
>  	{ .compatible = "ti,am654-dwc3" },
>  	{ .compatible = "rockchip,rk3328-dwc3" },
>  	{ .compatible = "rockchip,rk3399-dwc3" },

-- 
Tom
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