Re: [PATCH v1 1/2] usb: host: ehci-sunplus: Add driver for ehci in Sunplus SP7021

From: 施錕鴻
Date: Mon Feb 14 2022 - 04:01:22 EST

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In reply to: Greg KH: "Re: [PATCH v1 1/2] usb: host: ehci-sunplus: Add driver for ehci in Sunplus SP7021"
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Hi, Greg
About this issue, my colleague Hammer Hsieh has explained it to
you recently in the mail of "[PATCH v7 2/2] serial: sunplus-uart: Add
Sunplus
SoC UART Driver". The ehci driver and uart one are in the same Sunplus Soc.
Thanks for your review.

Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> 於 2022年2月14日週一下午4:38寫道：
>
> On Mon, Feb 14, 2022 at 04:32:41PM +0800, Vincent Shih wrote:
> > Add driver for ehci in Sunplus SP7021
> >
> > Signed-off-by: Vincent Shih <vincent.sunplus@xxxxxxxxx>
> > ---
> > MAINTAINERS | 6 +
> > drivers/usb/host/Kconfig | 11 +
> > drivers/usb/host/Makefile | 1 +
> > drivers/usb/host/ehci-sunplus.c | 527 ++++++++++++++++++++++++++++++++++++++++
> > 4 files changed, 545 insertions(+)
> > create mode 100644 drivers/usb/host/ehci-sunplus.c
> >
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index 80eebc1..6c2faf3 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -17947,6 +17947,12 @@ L: netdev@xxxxxxxxxxxxxxx
> > S: Maintained
> > F: drivers/net/ethernet/dlink/sundance.c
> >
> > +SUNPLUS USB EHCI DRIVER
> > +M: Vincent Shih <vincent.sunplus@xxxxxxxxx>
> > +L: linux-usb@xxxxxxxxxxxxxxx
> > +S: Maintained
> > +F: drivers/usb/host/ehci-sunplus.c
> > +
> > SUPERH
> > M: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
> > M: Rich Felker <dalias@xxxxxxxx>
> > diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
> > index c4736d1..9728d3b 100644
> > --- a/drivers/usb/host/Kconfig
> > +++ b/drivers/usb/host/Kconfig
> > @@ -339,6 +339,17 @@ config USB_OCTEON_EHCI
> > USB 2.0 device support. All CN6XXX based chips with USB are
> > supported.
> >
> > +config USB_EHCI_SUNPLUS
> > + tristate "EHCI support for Sunplus USB controller"
> > + depends on SOC_SP7021
> > + select NVMEM_SUNPLUS_OCOTP
> > + help
> > + Enables support for the on-chip EHCI controller in Sunplus
> > + SoCs. It supports 32-bit AHB/AXI config bus and 64-bit AXI
> > + data bus.
> > + This driver can also be built as a module. If so, the module
> > + will be called ehci-sunplus.
> > +
> > endif # USB_EHCI_HCD
> >
> > config USB_OXU210HP_HCD
> > diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
> > index 171de4d..7e9b5f1 100644
> > --- a/drivers/usb/host/Makefile
> > +++ b/drivers/usb/host/Makefile
> > @@ -46,6 +46,7 @@ obj-$(CONFIG_USB_EHCI_HCD_STI) += ehci-st.o
> > obj-$(CONFIG_USB_EHCI_EXYNOS) += ehci-exynos.o
> > obj-$(CONFIG_USB_EHCI_HCD_AT91) += ehci-atmel.o
> > obj-$(CONFIG_USB_EHCI_BRCMSTB) += ehci-brcm.o
> > +obj-$(CONFIG_USB_EHCI_SUNPLUS) += ehci-sunplus.o
> >
> > obj-$(CONFIG_USB_OXU210HP_HCD) += oxu210hp-hcd.o
> > obj-$(CONFIG_USB_ISP116X_HCD) += isp116x-hcd.o
> > diff --git a/drivers/usb/host/ehci-sunplus.c b/drivers/usb/host/ehci-sunplus.c
> > new file mode 100644
> > index 0000000..007923a
> > --- /dev/null
> > +++ b/drivers/usb/host/ehci-sunplus.c
> > @@ -0,0 +1,527 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +
> > +/*
> > + * The EHCI driver for Sunplus SP7021
> > + *
> > + * Copyright (C) 2019 Sunplus Technology Inc., All rights reserved.
>
> You have not touched this file since 2019?
>
>
> > + */
> > +
> > +#include <linux/bitfield.h>
> > +#include <linux/clk.h>
> > +#include <linux/delay.h>
> > +#include <linux/io.h>
> > +#include <linux/module.h>
> > +#include <linux/nvmem-consumer.h>
> > +#include <linux/of.h>
> > +#include <linux/of_platform.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/usb.h>
> > +#include <linux/usb/ehci_pdriver.h>
> > +#include <linux/usb/hcd.h>
> > +
> > +#include "ehci.h"
> > +
> > +#define RF_MASK_V(mask, val) (((mask) << 16) | (val))
> > +#define RF_MASK_V_CLR(mask) (((mask) << 16) | 0)
> > +
> > +#define USB_PORT0_ID 0
> > +#define USB_PORT1_ID 1
> > +#define USB_PORT_NUM 2
> > +
> > +#define MASK_BITS 0xffff
> > +
> > +#define OTP_DISC_LEVEL_DEFAULT 0xd
> > +#define OTP_DISC_LEVEL_BITS 0x5
> > +
> > +// GROUP 140/150 UPHY0/UPHY1
> > +#define CONFIG1 0x4
> > +#define J_HS_TX_PWRSAV BIT(5)
> > +#define CONFIG3 0xc
> > +#define J_FORCE_DISC_ON BIT(5)
> > +#define J_DEBUG_CTRL_ADDR_MACRO BIT(0)
> > +#define CONFIG7 0x1c
> > +#define J_DISC 0X1f
> > +#define CONFIG9 0x24
> > +#define J_ECO_PATH BIT(6)
> > +#define CONFIG16 0x40
> > +#define J_TBCWAIT_MASK GENMASK(6, 5)
> > +#define J_TBCWAIT_1P1_MS FIELD_PREP(J_TBCWAIT_MASK, 0)
> > +#define J_TVDM_SRC_DIS_MASK GENMASK(4, 3)
> > +#define J_TVDM_SRC_DIS_8P2_MS FIELD_PREP(J_TVDM_SRC_DIS_MASK, 3)
> > +#define J_TVDM_SRC_EN_MASK GENMASK(2, 1)
> > +#define J_TVDM_SRC_EN_1P6_MS FIELD_PREP(J_TVDM_SRC_EN_MASK, 0)
> > +#define J_BC_EN BIT(0)
> > +#define CONFIG17 0x44
> > +#define IBG_TRIM0_MASK GENMASK(7, 5)
> > +#define IBG_TRIM0_SSLVHT FIELD_PREP(IBG_TRIM0_MASK, 4)
> > +#define J_VDATREE_TRIM_MASK GENMASK(4, 1)
> > +#define J_VDATREE_TRIM_DEFAULT FIELD_PREP(J_VDATREE_TRIM_MASK, 9)
> > +#define CONFIG23 0x5c
> > +#define PROB_MASK GENMASK(5, 3)
> > +#define PROB FIELD_PREP(PROB_MASK, 7)
> > +
> > +// GROUP 0 MOON 0
> > +#define HARDWARE_RESET_CONTROL2 0x5c
> > +#define UPHY1_RESET BIT(14)
> > +#define UPHY0_RESET BIT(13)
> > +#define USBC1_RESET BIT(11)
> > +#define USBC0_RESET BIT(10)
> > +
> > +// GROUP 4 MOON 4
> > +#define USBC_CONTROL 0x44
> > +#define MO1_USBC1_USB0_SEL BIT(13)
> > +#define MO1_USBC1_USB0_CTRL BIT(12)
> > +#define MO1_USBC0_USB0_SEL BIT(5)
> > +#define MO1_USBC0_USB0_CTRL BIT(4)
> > +#define UPHY0_CONTROL0 0x48
> > +#define UPHY0_CONTROL1 0x4c
> > +#define UPHY0_CONTROL2 0x50
> > +#define MO1_UPHY0_RX_CLK_SEL BIT(6)
> > +#define UPHY0_CONTROL3 0x54
> > +#define MO1_UPHY0_PLL_POWER_OFF_SEL BIT(7)
> > +#define MO1_UPHY0_PLL_POWER_OFF BIT(3)
> > +#define UPHY1_CONTROL0 0x58
> > +#define UPHY1_CONTROL1 0x5c
> > +#define UPHY1_CONTROL2 0x60
> > +#define MO1_UPHY1_RX_CLK_SEL BIT(6)
> > +#define UPHY1_CONTROL3 0x64
> > +#define MO1_UPHY1_PLL_POWER_OFF_SEL BIT(7)
> > +#define MO1_UPHY1_PLL_POWER_OFF BIT(3)
> > +
> > +#define hcd_to_sp_ehci_priv(h) \
> > + ((struct sp_ehci_priv *)hcd_to_ehci(h)->priv)
> > +
> > +struct sp_ehci_priv {
> > + struct resource *uphy_res_mem[USB_PORT_NUM];
> > + struct resource *moon0_res_mem;
> > + struct resource *moon4_res_mem;
> > + struct clk *uphy_clk[USB_PORT_NUM];
> > + struct clk *ehci_clk[USB_PORT_NUM];
> > + void __iomem *uphy_regs[USB_PORT_NUM];
> > + void __iomem *moon0_regs;
> > + void __iomem *moon4_regs;
> > +};
> > +
> > +static int ehci_sunplus_reset(struct usb_hcd *hcd)
> > +{
> > + struct platform_device *pdev = to_platform_device(hcd->self.controller);
> > + struct usb_ehci_pdata *pdata = pdev->dev.platform_data;
> > + struct ehci_hcd *ehci = hcd_to_ehci(hcd);
> > + int retval;
> > +
> > + hcd->has_tt = pdata->has_tt;
> > + ehci->has_synopsys_hc_bug = pdata->has_synopsys_hc_bug;
> > + ehci->big_endian_desc = pdata->big_endian_desc;
> > + ehci->big_endian_mmio = pdata->big_endian_mmio;
> > +
> > + ehci->caps = hcd->regs + pdata->caps_offset;
> > + retval = ehci_setup(hcd);
> > +
> > + return retval;
> > +}
> > +
> > +static struct hc_driver __read_mostly ehci_sunplus_driver;
> > +
> > +static const struct ehci_driver_overrides ehci_sunplus_overrides __initconst = {
> > + .reset = ehci_sunplus_reset,
> > + .extra_priv_size = sizeof(struct sp_ehci_priv),
> > +};
> > +
> > +static int uphy0_init(struct platform_device *pdev, struct sp_ehci_priv *sp_priv)
> > +{
> > + struct nvmem_cell *cell;
> > + char *disc_name = "disc_vol";
> > + ssize_t otp_l = 0;
> > + char *otp_v;
> > + int port = pdev->id - 1;
> > + u32 val, set, pll_pwr_on, pll_pwr_off;
> > +
> > + /* Default value modification */
> > + writel(RF_MASK_V(MASK_BITS, 0x4002), sp_priv->moon4_regs + UPHY0_CONTROL0);
> > + writel(RF_MASK_V(MASK_BITS, 0x8747), sp_priv->moon4_regs + UPHY0_CONTROL1);
> > +
> > + /* PLL power off/on twice */
> > + pll_pwr_off = (readl(sp_priv->moon4_regs + UPHY0_CONTROL3) & ~MASK_BITS)
> > + | MO1_UPHY0_PLL_POWER_OFF_SEL | MO1_UPHY0_PLL_POWER_OFF;
> > + pll_pwr_on = (readl(sp_priv->moon4_regs + UPHY0_CONTROL3) & ~MASK_BITS)
> > + | MO1_UPHY0_PLL_POWER_OFF_SEL;
> > +
> > + writel(RF_MASK_V(MASK_BITS, pll_pwr_off), sp_priv->moon4_regs + UPHY0_CONTROL3);
> > + mdelay(1);
> > + writel(RF_MASK_V(MASK_BITS, pll_pwr_on), sp_priv->moon4_regs + UPHY0_CONTROL3);
> > + mdelay(1);
> > + writel(RF_MASK_V(MASK_BITS, pll_pwr_off), sp_priv->moon4_regs + UPHY0_CONTROL3);
> > + mdelay(1);
> > + writel(RF_MASK_V(MASK_BITS, pll_pwr_on), sp_priv->moon4_regs + UPHY0_CONTROL3);
> > + mdelay(1);
> > + writel(RF_MASK_V(MASK_BITS, 0x0), sp_priv->moon4_regs + UPHY0_CONTROL3);
> > +
>
> Why not just do a read after a write so that you know that is the
> correct delay? Doing a sleep like this seems slow and possibly wrong.
>
> > + /* reset UPHY0 */
> > + writel(RF_MASK_V(UPHY0_RESET, UPHY0_RESET), sp_priv->moon0_regs + HARDWARE_RESET_CONTROL2);
> > + writel(RF_MASK_V_CLR(UPHY0_RESET), sp_priv->moon0_regs + HARDWARE_RESET_CONTROL2);
> > + mdelay(1);
>
> Again, read()?
>
> > +
> > + /* board uphy 0 internal register modification for tid certification */
> > + cell = nvmem_cell_get(&pdev->dev, disc_name);
> > + if (IS_ERR_OR_NULL(cell)) {
> > + if (PTR_ERR(cell) == -EPROBE_DEFER)
> > + return -EPROBE_DEFER;
> > + }
> > +
> > + otp_v = nvmem_cell_read(cell, &otp_l);
> > + nvmem_cell_put(cell);
> > +
> > + if (otp_v)
> > + set = ((*otp_v >> OTP_DISC_LEVEL_BITS) |
> > + (*(otp_v + 1) << (sizeof(char) * 8 - OTP_DISC_LEVEL_BITS))) & J_DISC;
> > +
> > + if (!otp_v || set == 0)
> > + set = OTP_DISC_LEVEL_DEFAULT;
> > +
> > + val = readl(sp_priv->uphy_regs[port] + CONFIG7);
> > + val = (val & ~J_DISC) | set;
> > + writel(val, sp_priv->uphy_regs[port] + CONFIG7);
> > +
> > + val = readl(sp_priv->uphy_regs[port] + CONFIG9);
> > + val &= ~(J_ECO_PATH);
> > + writel(val, sp_priv->uphy_regs[port] + CONFIG9);
> > +
> > + val = readl(sp_priv->uphy_regs[port] + CONFIG1);
> > + val &= ~(J_HS_TX_PWRSAV);
> > + writel(val, sp_priv->uphy_regs[port] + CONFIG1);
> > +
> > + val = readl(sp_priv->uphy_regs[port] + CONFIG23);
> > + val = (val & ~PROB) | PROB;
> > + writel(val, sp_priv->uphy_regs[port] + CONFIG23);
> > +
> > + /* USBC 0 reset */
> > + writel(RF_MASK_V(USBC0_RESET, USBC0_RESET), sp_priv->moon0_regs + HARDWARE_RESET_CONTROL2);
> > + writel(RF_MASK_V_CLR(USBC0_RESET), sp_priv->moon0_regs + HARDWARE_RESET_CONTROL2);
> > +
> > + /* port 0 uphy clk fix */
> > + writel(RF_MASK_V(MO1_UPHY0_RX_CLK_SEL, MO1_UPHY0_RX_CLK_SEL),
> > + sp_priv->moon4_regs + UPHY0_CONTROL2);
> > +
> > + /* switch to host */
> > + writel(RF_MASK_V(MO1_USBC0_USB0_SEL | MO1_USBC0_USB0_CTRL,
> > + MO1_USBC0_USB0_SEL | MO1_USBC0_USB0_CTRL),
> > + sp_priv->moon4_regs + USBC_CONTROL);
> > +
> > + /* battery charger */
> > + writel(J_TBCWAIT_1P1_MS | J_TVDM_SRC_DIS_8P2_MS | J_TVDM_SRC_EN_1P6_MS | J_BC_EN,
> > + sp_priv->uphy_regs[port] + CONFIG16);
> > + writel(IBG_TRIM0_SSLVHT | J_VDATREE_TRIM_DEFAULT, sp_priv->uphy_regs[port] + CONFIG17);
> > + writel(J_FORCE_DISC_ON | J_DEBUG_CTRL_ADDR_MACRO, sp_priv->uphy_regs[port] + CONFIG3);
>
> What about all of these writes, are you sure they made it to the
> hardware ok? No need to read?
>
> Same for elsewhere in the file.
>
> thanks,
>
> greg k-h

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Previous message: Lennart Poettering: "Re: [PATCH RFC v0] random: block in /dev/urandom"
In reply to: Greg KH: "Re: [PATCH v1 1/2] usb: host: ehci-sunplus: Add driver for ehci in Sunplus SP7021"
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