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Subject: Re: [PATCH 05/31] usb: usbssp: Added first part of initialization
 sequence.
To:     Pawel Laszczak <pawell@cadence.com>
CC:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        <linux-usb@vger.kernel.org>, Felipe Balbi <balbi@kernel.org>,
        <linux-kernel@vger.kernel.org>, <ltyrala@cadence.com>,
        <adouglas@cadence.com>
References: <1532023084-28083-1-git-send-email-pawell@cadence.com>
 <1532023084-28083-6-git-send-email-pawell@cadence.com>
From:   Roger Quadros <rogerq@ti.com>
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Message-ID: <45dff595-5363-bbef-1240-6b693b4829b2@ti.com>
Date:   Fri, 3 Aug 2018 13:17:54 +0300
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In-Reply-To: <1532023084-28083-6-git-send-email-pawell@cadence.com>
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Sender: linux-kernel-owner@vger.kernel.org
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Hi,

On 19/07/18 20:57, Pawel Laszczak wrote:
> Patch adds some initialization function. The initialization sequence
> is quite complicated and this patch implements it only partially.
> Initialization will be completed in next few patches.
> 
> Patch introduce three new files:
> 1. gadget-dbg.c - file contains functions used for debugging purpose.
> 2. gadget-ext-caps.h - holds macro definition related to
> 		       Extended Capabilities
> 3. gadget-if - file implements stuff related to upper layer
> 	(e.g usb_ep_ops, usb_gadget_ops interface).
> 
> Signed-off-by: Pawel Laszczak <pawell@cadence.com>
> ---
>  drivers/usb/usbssp/Makefile          |   1 +
>  drivers/usb/usbssp/gadget-dbg.c      |  30 ++++
>  drivers/usb/usbssp/gadget-ext-caps.h |  53 ++++++
>  drivers/usb/usbssp/gadget-if.c       |  24 +++
>  drivers/usb/usbssp/gadget.c          | 242 +++++++++++++++++++++++++++
>  drivers/usb/usbssp/gadget.h          |  15 ++
>  6 files changed, 365 insertions(+)
>  create mode 100644 drivers/usb/usbssp/gadget-dbg.c
>  create mode 100644 drivers/usb/usbssp/gadget-ext-caps.h
>  create mode 100644 drivers/usb/usbssp/gadget-if.c
> 
> diff --git a/drivers/usb/usbssp/Makefile b/drivers/usb/usbssp/Makefile
> index d85f15afb51c..0606f3c63cd0 100644
> --- a/drivers/usb/usbssp/Makefile
> +++ b/drivers/usb/usbssp/Makefile
> @@ -5,6 +5,7 @@ CFLAGS_gadget-trace.o := -I$(src)
>  obj-$(CONFIG_USB_USBSSP_GADGET) += usbssp.o
>  usbssp-y 			:= usbssp-plat.o gadget-ring.o \
>  				   gadget.o
> +				    gadget-dbg.o
>  
>  ifneq ($(CONFIG_TRACING),)
>  	usbssp-y		+= gadget-trace.o
> diff --git a/drivers/usb/usbssp/gadget-dbg.c b/drivers/usb/usbssp/gadget-dbg.c
> new file mode 100644
> index 000000000000..277617d1a996
> --- /dev/null
> +++ b/drivers/usb/usbssp/gadget-dbg.c
> @@ -0,0 +1,30 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * USBSSP device controller driver
> + *
> + * Copyright (C) 2018 Cadence.
> + *
> + * Author: Pawel Laszczak
> + *
> + * A lot of code based on Linux XHCI driver.
> + * Origin: Copyright (C) 2008 Intel Corp
> + */
> +
> +#include "gadget.h"
> +
> +void usbssp_dbg_trace(struct usbssp_udc *usbssp_data,
> +		      void (*trace)(struct va_format *),
> +		      const char *fmt, ...)
> +{
> +	struct va_format vaf;
> +	va_list args;
> +
> +	va_start(args, fmt);
> +	vaf.fmt = fmt;
> +	vaf.va = &args;
> +	dev_dbg(usbssp_data->dev, "%pV\n", &vaf);

dev_dbg will mess up with timings to be useful.
Why not just use one of the trace events you defined in gadget-trace.h?

> +	trace(&vaf);
> +	va_end(args);
> +}
> +EXPORT_SYMBOL_GPL(usbssp_dbg_trace);
> +
> diff --git a/drivers/usb/usbssp/gadget-ext-caps.h b/drivers/usb/usbssp/gadget-ext-caps.h
> new file mode 100644
> index 000000000000..2bf327046376
> --- /dev/null
> +++ b/drivers/usb/usbssp/gadget-ext-caps.h
> @@ -0,0 +1,53 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * USBSSP device controller driver
> + *
> + * Copyright (C) 2018 Cadence.
> + *
> + * Author: Pawel Laszczak
> + *
> + * A lot of code based on Linux XHCI driver.
> + * Origin: Copyright (C) 2008 Intel Corp
> + */
> +
> +/* Up to 16 ms to halt an DC */
> +#define USBSSP_MAX_HALT_USEC		(16*1000)
> +
> +/* DC not running - set to 1 when run/stop bit is cleared. */
> +#define USBSSP_STS_HALT			BIT(0)
> +
> +/* HCCPARAMS offset from PCI base address */
> +#define USBSSP_HCC_PARAMS_OFFSET	0x10
> +/* HCCPARAMS contains the first extended capability pointer */
> +#define USBSSP_HCC_EXT_CAPS(p)		(((p)>>16)&0xffff)
> +
> +/* Command and Status registers offset from the Operational Registers address */
> +#define USBSSP_CMD_OFFSET		0x00
> +#define USBSSP_STS_OFFSET		0x04
> +
> +/* Capability Register */
> +/* bits 7:0 - how long is the Capabilities register */
> +#define USBSSP_HC_LENGTH(p)		(((p)>>00)&0x00ff)
> +
> +/* Extended capability register fields */
> +#define USBSSP_EXT_CAPS_ID(p)		(((p)>>0)&0xff)
> +#define USBSSP_EXT_CAPS_NEXT(p)		(((p)>>8)&0xff)
> +#define	v_EXT_CAPS_VAL(p)		((p)>>16)
> +/* Extended capability IDs - ID 0 reserved */
> +#define USBSSP_EXT_CAPS_PROTOCOL	2
> +
> +/* USB 2.0 hardware LMP capability*/
> +#define USBSSP_HLC			BIT(19)
> +#define USBSSP_BLC			BIT(20)
> +
> +/* command register values to disable interrupts and halt the DC */
> +/* start/stop DC execution - do not write unless DC is halted*/
> +#define USBSSP_CMD_RUN			BIT(0)
> +/* Event Interrupt Enable - get irq when EINT bit is set in USBSTS register */
> +#define USBSSP_CMD_EIE			BIT(2)
> +/* Host System Error Interrupt Enable - get irq when HSEIE bit set in USBSTS */
> +#define USBSSP_CMD_HSEIE		BIT(3)
> +/* Enable Wrap Event - '1' means DC generates an event when MFINDEX wraps. */
> +#define USBSSP_CMD_EWE			BIT(10)
> +
> +#define USBSSP_IRQS	(USBSSP_CMD_EIE | USBSSP_CMD_HSEIE | USBSSP_CMD_EWE)
> diff --git a/drivers/usb/usbssp/gadget-if.c b/drivers/usb/usbssp/gadget-if.c
> new file mode 100644
> index 000000000000..d53e0fb65299
> --- /dev/null
> +++ b/drivers/usb/usbssp/gadget-if.c
> @@ -0,0 +1,24 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * USBSSP device controller driver
> + *
> + * Copyright (C) 2018 Cadence.
> + *
> + * Author: Pawel Laszczak
> + *
> + */
> +
> +#include <linux/usb/gadget.h>
> +#include <linux/usb/composite.h>
> +#include "gadget.h"
> +
> +int usbssp_gadget_init_endpoint(struct usbssp_udc *usbssp_data)
> +{
> +	/*TODO: it has to be implemented*/
> +	return 0;
> +}
> +
> +void usbssp_gadget_free_endpoint(struct usbssp_udc *usbssp_data)
> +{
> +	/*TODO: it has to be implemented*/
> +}
> diff --git a/drivers/usb/usbssp/gadget.c b/drivers/usb/usbssp/gadget.c
> index 2f60d7dd1fe4..338ec2ec18b1 100644
> --- a/drivers/usb/usbssp/gadget.c
> +++ b/drivers/usb/usbssp/gadget.c
> @@ -23,6 +23,107 @@
>  #include "gadget-trace.h"
>  #include "gadget.h"
>  
> +
> +/*

/**

> + * usbssp_handshake - spin reading dc until handshake completes or fails
> + * @ptr: address of dc register to be read
> + * @mask: bits to look at in result of read
> + * @done: value of those bits when handshake succeeds
> + * @usec: timeout in microseconds
> + *
> + * Returns negative errno, or zero on success
> + *
> + * Success happens when the "mask" bits have the specified value (hardware
> + * handshake done). There are two failure modes: "usec" have passed (major
> + * hardware flakeout), or the register reads as all-ones (hardware removed).
> + */
> +int usbssp_handshake(void __iomem *ptr, u32 mask, u32 done, int usec)
> +{
> +	u32	result;
> +
> +	do {
> +		result = readl(ptr);
> +		if (result == ~(u32)0)	/* card removed */
> +			return -ENODEV;
> +		result &= mask;
> +		if (result == done)
> +			return 0;
> +		udelay(1);
> +		usec--;
> +	} while (usec > 0);
> +	return -ETIMEDOUT;
> +}
> +
> +/*
> + * Disable interrupts and begin the DC halting process.
> + */
> +void usbssp_quiesce(struct usbssp_udc *usbssp_data)
> +{
> +	u32 halted;
> +	u32 cmd;
> +	u32 mask;
> +
> +	mask = ~(u32)(USBSSP_IRQS);
> +
> +	halted = readl(&usbssp_data->op_regs->status) & STS_HALT;
> +	if (!halted)
> +		mask &= ~CMD_RUN;
> +
> +	cmd = readl(&usbssp_data->op_regs->command);
> +	cmd &= mask;
> +	writel(cmd, &usbssp_data->op_regs->command);
> +}
> +
> +/*
> + * Force DC into halt state.
> + *
> + * Disable any IRQs and clear the run/stop bit.
> + * USBSSP will complete any current and actively pipelined transactions, and
> + * should halt within 16 ms of the run/stop bit being cleared.
> + * Read DC Halted bit in the status register to see when the DC is finished.
> + */
> +int usbssp_halt(struct usbssp_udc *usbssp_data)
> +{
> +	int ret;
> +
> +	usbssp_dbg_trace(usbssp_data, trace_usbssp_dbg_init,
> +			"// Halt the USBSSP");
> +	usbssp_quiesce(usbssp_data);
> +
> +	ret = usbssp_handshake(&usbssp_data->op_regs->status,
> +		STS_HALT, STS_HALT, USBSSP_MAX_HALT_USEC);
> +
> +	if (!ret) {
> +		dev_warn(usbssp_data->dev, "Device halt failed, %d\n", ret);
> +		return ret;
> +	}
> +
> +	usbssp_data->usbssp_state |= USBSSP_STATE_HALTED;
> +	usbssp_data->cmd_ring_state = CMD_RING_STATE_STOPPED;
> +	return ret;
> +}
> +
> +
> +/*
> + * Initialize memory for gadget driver and USBSSP (one-time init).
> + *
> + * Program the PAGESIZE register, initialize the device context array, create
> + * device contexts, set up a command ring segment (or two?), create event
> + * ring (one for now).
> + */
> +int usbssp_init(struct usbssp_udc *usbssp_data)
> +{
> +	int retval = 0;
> +
> +	spin_lock_init(&usbssp_data->lock);
> +	spin_lock_init(&usbssp_data->irq_thread_lock);
> +
> +	/*TODO: memory initialization*/
> +	//retval = usbssp_mem_init(usbssp_data, GFP_KERNEL);
> +
> +	return retval;
> +}
> +
>  #ifdef CONFIG_PM
>  /*
>   * Stop DC (not bus-specific)
> @@ -50,9 +151,146 @@ int usbssp_resume(struct usbssp_udc *usbssp_data, bool hibernated)
>  
>  #endif	/* CONFIG_PM */
>  
> +int usbssp_gen_setup(struct usbssp_udc *usbssp_data)
> +{
> +	int retval;
> +
> +	mutex_init(&usbssp_data->mutex);
> +
> +	usbssp_data->cap_regs = usbssp_data->regs;
> +	usbssp_data->op_regs = usbssp_data->regs +
> +		HC_LENGTH(readl(&usbssp_data->cap_regs->hc_capbase));
> +
> +	usbssp_data->run_regs = usbssp_data->regs +
> +		(readl(&usbssp_data->cap_regs->run_regs_off) & RTSOFF_MASK);
> +	/* Cache read-only capability registers */
> +	usbssp_data->hcs_params1 = readl(&usbssp_data->cap_regs->hcs_params1);
> +	usbssp_data->hcs_params2 = readl(&usbssp_data->cap_regs->hcs_params2);
> +	usbssp_data->hcs_params3 = readl(&usbssp_data->cap_regs->hcs_params3);
> +	usbssp_data->hcc_params = readl(&usbssp_data->cap_regs->hc_capbase);
> +	usbssp_data->hci_version = HC_VERSION(usbssp_data->hcc_params);
> +	usbssp_data->hcc_params = readl(&usbssp_data->cap_regs->hcc_params);
> +	usbssp_data->hcc_params2 = readl(&usbssp_data->cap_regs->hcc_params2);
> +
> +	/* Make sure the Device Controller is halted. */
> +	retval = usbssp_halt(usbssp_data);
> +	if (retval)
> +		return retval;
> +
> +	dev_dbg(usbssp_data->dev, "Resetting Device Controller\n");

do you really need all these dev_dbg prints? You should just fit them to one
of the trace event classes that you already have or add a new one if needed.

> +	/* Reset the internal DC memory state and registers. */
> +	/*TODO: add implementation of usbssp_reset function*/
> +	//retval = usbssp_reset(usbssp_data);
> +	if (retval)
> +		return retval;
> +	dev_dbg(usbssp_data->dev, "Reset complete\n");
> +
> +	/* Set dma_mask and coherent_dma_mask to 64-bits,
> +	 * if USBSSP supports 64-bit addressing
> +	 */
> +	if (HCC_64BIT_ADDR(usbssp_data->hcc_params) &&
> +	    !dma_set_mask(usbssp_data->dev, DMA_BIT_MASK(64))) {
> +		dev_dbg(usbssp_data->dev, "Enabling 64-bit DMA addresses.\n");
> +		dma_set_coherent_mask(usbssp_data->dev, DMA_BIT_MASK(64));
> +	} else {
> +		/*
> +		 * This is to avoid error in cases where a 32-bit USB
> +		 * controller is used on a 64-bit capable system.
> +		 */
> +		retval = dma_set_mask(usbssp_data->dev, DMA_BIT_MASK(32));
> +		if (retval)
> +			return retval;
> +		dev_dbg(usbssp_data->dev, "Enabling 32-bit DMA addresses.\n");
> +		dma_set_coherent_mask(usbssp_data->dev, DMA_BIT_MASK(32));
> +	}
> +
> +	/* Initialize USBSSP controller data structures. */
> +	retval = usbssp_init(usbssp_data);
> +	if (retval)
> +		return retval;
> +
> +	dev_info(usbssp_data->dev, "USBSSP params 0x%08x USBSSP version 0x%x\n",
> +		usbssp_data->hcc_params, usbssp_data->hci_version);
> +
> +	return 0;
> +}
> +
> +/*
> + * gadget-if.c file is part of gadget.c file and implements interface
> + * for gadget driver
> + */
> +#include "gadget-if.c"
> +

All includes should be together at the beginning of the file.

>  int usbssp_gadget_init(struct usbssp_udc *usbssp_data)
>  {
>  	int ret;
> +
> +	/*
> +	 * Check the compiler generated sizes of structures that must be laid
> +	 * out in specific ways for hardware access.
> +	 */
> +	BUILD_BUG_ON(sizeof(struct usbssp_doorbell_array) != 2*32/8);
> +	BUILD_BUG_ON(sizeof(struct usbssp_slot_ctx) != 8*32/8);
> +	BUILD_BUG_ON(sizeof(struct usbssp_ep_ctx) != 8*32/8);
> +	/* usbssp_device has eight fields, and also
> +	 * embeds one usbssp_slot_ctx and 31 usbssp_ep_ctx
> +	 */
> +	BUILD_BUG_ON(sizeof(struct usbssp_stream_ctx) != 4*32/8);
> +	BUILD_BUG_ON(sizeof(union usbssp_trb) != 4*32/8);
> +	BUILD_BUG_ON(sizeof(struct usbssp_erst_entry) != 4*32/8);
> +	BUILD_BUG_ON(sizeof(struct usbssp_cap_regs) != 8*32/8);
> +	BUILD_BUG_ON(sizeof(struct usbssp_intr_reg) != 8*32/8);
> +	/* usbssp_run_regs has eight fields and embeds 128 usbssp_intr_regs */
> +	BUILD_BUG_ON(sizeof(struct usbssp_run_regs) != (8+8*128)*32/8);
> +
> +	/* fill gadget fields */
> +	/*TODO: implements usbssp_gadget_ops object*/
> +	//usbssp_data->gadget.ops = &usbssp_gadget_ops;
> +	usbssp_data->gadget.name = "usbssp-gadget";
> +	usbssp_data->gadget.max_speed = USB_SPEED_SUPER_PLUS;
> +	usbssp_data->gadget.speed = USB_SPEED_UNKNOWN;
> +	usbssp_data->gadget.sg_supported = true;
> +	usbssp_data->gadget.lpm_capable = 1;
> +
> +	usbssp_data->setup_buf = kzalloc(USBSSP_EP0_SETUP_SIZE, GFP_KERNEL);
> +	if (!usbssp_data->setup_buf)
> +		return -ENOMEM;
> +
> +	/*USBSSP support not aligned buffer but this option
> +	 * improve performance of this controller.
> +	 */

Multi-line comment formatting. Checkpach should complain.

> +	usbssp_data->gadget.quirk_ep_out_aligned_size = true;
> +	ret = usbssp_gen_setup(usbssp_data);
> +	if (ret < 0) {
> +		dev_err(usbssp_data->dev,
> +				"Generic initialization failed with error code%d\n",
> +				ret);
> +		goto err3;
> +	}
> +
> +	ret = usbssp_gadget_init_endpoint(usbssp_data);
> +	if (ret < 0) {
> +		dev_err(usbssp_data->dev, "failed to initialize endpoints\n");
> +		goto err1;
> +	}
> +
> +	ret = usb_add_gadget_udc(usbssp_data->dev, &usbssp_data->gadget);
> +
> +	if (ret) {
> +		dev_err(usbssp_data->dev, "failed to register udc\n");
> +		goto err2;
> +	}
> +
> +	return ret;
> +err2:
> +	usbssp_gadget_free_endpoint(usbssp_data);
> +err1:
> +	usbssp_halt(usbssp_data);
> +	/*TODO add implementation of usbssp_reset function*/
> +	//usbssp_reset(usbssp_data);
> +	/*TODO add implementation of freeing memory*/
> +	//usbssp_mem_cleanup(usbssp_data);
> +err3:
>  	return ret;
>  }
>  
> @@ -60,5 +298,9 @@ int usbssp_gadget_exit(struct usbssp_udc *usbssp_data)
>  {
>  	int ret = 0;
>  
> +	usb_del_gadget_udc(&usbssp_data->gadget);
> +	usbssp_gadget_free_endpoint(usbssp_data);
> +	/*TODO: add usbssp_stop implementation*/
> +	//usbssp_stop(usbssp_data);
>  	return ret;
>  }
> diff --git a/drivers/usb/usbssp/gadget.h b/drivers/usb/usbssp/gadget.h
> index 55e20795d900..5d8918f8da84 100644
> --- a/drivers/usb/usbssp/gadget.h
> +++ b/drivers/usb/usbssp/gadget.h
> @@ -12,8 +12,10 @@
>  #ifndef __LINUX_USBSSP_GADGET_H
>  #define __LINUX_USBSSP_GADGET_H
>  
> +#include <linux/irq.h>
>  #include <linux/io-64-nonatomic-lo-hi.h>
>  #include <linux/usb/gadget.h>
> +#include "gadget-ext-caps.h"
>  
>  /* Max number slots - only 1 is allowed */
>  #define DEV_MAX_SLOTS		1
> @@ -1676,7 +1678,18 @@ static inline void usbssp_write_64(struct usbssp_udc *usbssp_data,
>  	lo_hi_writeq(val, regs);
>  }
>  
> +/* USBSSP memory management */
> +void usbssp_dbg_trace(struct usbssp_udc *usbssp_data,
> +		void (*trace)(struct va_format *),
> +		const char *fmt, ...);

what has this function to do with memory management?

>  /* USBSSP Device controller glue */
> +void usbssp_bottom_irq(struct work_struct *work);

usbssp_bottom_irq() wasn't defined in this patch.

> +int usbssp_init(struct usbssp_udc *usbssp_data);
> +void usbssp_stop(struct usbssp_udc *usbssp_data);
> +int usbssp_handshake(void __iomem *ptr, u32 mask, u32 done, int usec);
> +void usbssp_quiesce(struct usbssp_udc *usbssp_data);
> +extern int usbssp_reset(struct usbssp_udc *usbssp_data);
> +
>  int usbssp_suspend(struct usbssp_udc *usbssp_data, bool do_wakeup);
>  int usbssp_resume(struct usbssp_udc *usbssp_data, bool hibernated);
>  
> @@ -1689,6 +1702,8 @@ dma_addr_t usbssp_trb_virt_to_dma(struct usbssp_segment *seg,
>  /* USBSSP gadget interface*/
>  int usbssp_gadget_init(struct usbssp_udc *usbssp_data);
>  int usbssp_gadget_exit(struct usbssp_udc *usbssp_data);
> +void usbssp_gadget_free_endpoint(struct usbssp_udc *usbssp_data);
> +int usbssp_gadget_init_endpoint(struct usbssp_udc *usbssp_data);
>  
>  static inline char *usbssp_slot_state_string(u32 state)
>  {
> 

-- 
cheers,
-roger

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