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Commit 3c3962f6 authored by Hemant Kumar's avatar Hemant Kumar Committed by Devdutt Patnaik
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usb: dwc3: Add support for GSI event buffer configuration 



Add additional event buffers for GSI based hardware accelerated
endpoints and its related configuration.

Change-Id: Ibedf73690040b8bd872f5621835680a66c22e265
Signed-off-by: default avatarHemant Kumar <hemantk@codeaurora.org>
parent f5d3db32

Documentation/devicetree/bindings/usb/dwc3.txt

+4 −0
Original line number Diff line number Diff line
@@ -25,6 +25,9 @@ Optional properties: 
 - snps,is-utmi-l1-suspend: true when DWC3 asserts output signal

			utmi_l1_suspend_n, false when asserts utmi_sleep_n

 - snps,hird-threshold: HIRD threshold

 - snps,num-normal-evt-buffs: If present, specifies number of normal event buffers. Default is 1.

 - snps,num-gsi-evt-buffs: If present, specifies number of GSI based hardware accelerated event buffers.

	1 event buffer is needed per h/w accelerated endpoint.



This is usually a subnode to DWC3 glue to which it is connected.
@@ -35,4 +38,5 @@ dwc3@4a030000 { 
	usb-phy = <&usb2_phy>, <&usb3,phy>;

	tx-fifo-resize;

	snps,usb3-u1u2-disable;

	snps,num-gsi-evt-buffs = <0x2>;

};

arch/arm/boot/dts/qcom/mdmcalifornium.dtsi

+1 −0
Original line number Diff line number Diff line
@@ -575,6 +575,7 @@ 
			snps,lpm-nyet-thresh = <0x8>;

			snps,bus-suspend-enable;

			snps,usb3-u1u2-disable;

			snps,num-gsi-evt-buffs = <0x3>;

		};

	};

drivers/usb/dwc3/core.c

+54 −13
Original line number Diff line number Diff line
@@ -234,7 +234,7 @@ static void dwc3_free_one_event_buffer(struct dwc3 *dwc, 
 * otherwise ERR_PTR(errno).

 */

static struct dwc3_event_buffer *dwc3_alloc_one_event_buffer(struct dwc3 *dwc,

		unsigned length)

		unsigned length, enum event_buf_type type)

{

	struct dwc3_event_buffer	*evt;
@@ -244,6 +244,7 @@ static struct dwc3_event_buffer *dwc3_alloc_one_event_buffer(struct dwc3 *dwc, 


	evt->dwc	= dwc;

	evt->length	= length;

	evt->type	= type;

	evt->buf	= dma_alloc_coherent(dwc->dev, length,

			&evt->dma, GFP_KERNEL);

	if (!evt->buf)
@@ -278,26 +279,40 @@ static void dwc3_free_event_buffers(struct dwc3 *dwc) 
 */

static int dwc3_alloc_event_buffers(struct dwc3 *dwc, unsigned length)

{

	int			num;

	int	i;

	int	j = 0;



	num = DWC3_NUM_INT(dwc->hwparams.hwparams1);

	dwc->num_event_buffers = num;

	dwc->num_event_buffers = dwc->num_normal_event_buffers +

		dwc->num_gsi_event_buffers;



	dwc->ev_buffs = devm_kzalloc(dwc->dev, sizeof(*dwc->ev_buffs) * num,

	dwc->ev_buffs = devm_kzalloc(dwc->dev,

			sizeof(*dwc->ev_buffs) * dwc->num_event_buffers,

			GFP_KERNEL);

	if (!dwc->ev_buffs)

		return -ENOMEM;



	for (i = 0; i < num; i++) {

	for (i = 0; i < dwc->num_normal_event_buffers; i++) {

		struct dwc3_event_buffer	*evt;



		evt = dwc3_alloc_one_event_buffer(dwc, length);

		evt = dwc3_alloc_one_event_buffer(dwc, length,

				EVT_BUF_TYPE_NORMAL);

		if (IS_ERR(evt)) {

			dev_err(dwc->dev, "can't allocate event buffer\n");

			return PTR_ERR(evt);

		}

		dwc->ev_buffs[i] = evt;

		dwc->ev_buffs[j++] = evt;

	}



	for (i = 0; i < dwc->num_gsi_event_buffers; i++) {

		struct dwc3_event_buffer	*evt;



		evt = dwc3_alloc_one_event_buffer(dwc, length,

				EVT_BUF_TYPE_GSI);

		if (IS_ERR(evt)) {

			dev_err(dwc->dev, "can't allocate event buffer\n");

			return PTR_ERR(evt);

		}

		dwc->ev_buffs[j++] = evt;

	}



	return 0;
@@ -324,10 +339,23 @@ int dwc3_event_buffers_setup(struct dwc3 *dwc) 


		dwc3_writel(dwc->regs, DWC3_GEVNTADRLO(n),

				lower_32_bits(evt->dma));



		if (evt->type == EVT_BUF_TYPE_NORMAL) {

			dwc3_writel(dwc->regs, DWC3_GEVNTADRHI(n),

					upper_32_bits(evt->dma));

			dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(n),

					DWC3_GEVNTSIZ_SIZE(evt->length));

		} else {

			dwc3_writel(dwc->regs, DWC3_GEVNTADRHI(n),

				DWC3_GEVNTADRHI_EVNTADRHI_GSI_EN(

					DWC3_GEVENT_TYPE_GSI) |

				DWC3_GEVNTADRHI_EVNTADRHI_GSI_IDX(n));



			dwc3_writel(dwc->regs, DWC3_GEVNTSIZ(n),

				DWC3_GEVNTCOUNT_EVNTINTRPTMASK |

				((evt->length) & 0xffff));

		}



		dwc3_writel(dwc->regs, DWC3_GEVNTCOUNT(n), 0);

	}
@@ -803,6 +831,7 @@ static int dwc3_probe(struct platform_device *pdev) 
	struct dwc3		*dwc;

	u8			lpm_nyet_threshold;

	u8			hird_threshold;

	u32			num_evt_buffs;



	int			ret;
@@ -891,6 +920,18 @@ static int dwc3_probe(struct platform_device *pdev) 


		dwc->disable_clk_gating = of_property_read_bool(node,

					"snps,disable-clk-gating");



		dwc->num_normal_event_buffers = 1;

		ret = of_property_read_u32(node,

			"snps,num-normal-evt-buffs", &num_evt_buffs);

		if (!ret)

			dwc->num_normal_event_buffers = num_evt_buffs;



		ret = of_property_read_u32(node,

			"snps,num-gsi-evt-buffs", &num_evt_buffs);

		if (!ret)

			dwc->num_gsi_event_buffers = num_evt_buffs;



		if (dwc->enable_bus_suspend) {

			pm_runtime_set_autosuspend_delay(dev, 500);

			pm_runtime_use_autosuspend(dev);

drivers/usb/dwc3/core.h

+13 −0
Original line number Diff line number Diff line
@@ -124,6 +124,11 @@ 
#define DWC3_GEVNTSIZ(n)	(0xc408 + (n * 0x10))

#define DWC3_GEVNTCOUNT(n)	(0xc40c + (n * 0x10))



#define DWC3_GEVNTCOUNT_EVNTINTRPTMASK		(1 << 31)

#define DWC3_GEVNTADRHI_EVNTADRHI_GSI_EN(n)	(n << 22)

#define DWC3_GEVNTADRHI_EVNTADRHI_GSI_IDX(n)	(n << 16)

#define DWC3_GEVENT_TYPE_GSI			0x3



#define DWC3_GHWPARAMS8		0xc600

#define DWC3_GFLADJ		0xc630
@@ -439,6 +444,11 @@ 


struct dwc3_trb;



enum event_buf_type {

	EVT_BUF_TYPE_NORMAL,

	EVT_BUF_TYPE_GSI

};



/**

 * struct dwc3_event_buffer - Software event buffer representation

 * @buf: _THE_ buffer
@@ -452,6 +462,7 @@ struct dwc3_trb; 
struct dwc3_event_buffer {

	void			*buf;

	unsigned		length;

	enum event_buf_type	type;

	unsigned int		lpos;

	unsigned int		count;

	unsigned int		flags;
@@ -855,6 +866,8 @@ struct dwc3 { 


	u32			nr_scratch;

	u32			num_event_buffers;

	u32			num_normal_event_buffers;

	u32			num_gsi_event_buffers;



	u32			u1;

	u32			u1u2;

drivers/usb/dwc3/gadget.c

+2 −2
Original line number Diff line number Diff line
@@ -3443,7 +3443,7 @@ static irqreturn_t dwc3_thread_interrupt(int irq, void *_dwc) 
	spin_lock_irqsave(&dwc->lock, flags);

	dwc->bh_handled_evt_cnt[dwc->bh_dbg_index] = 0;



	for (i = 0; i < dwc->num_event_buffers; i++)

	for (i = 0; i < dwc->num_normal_event_buffers; i++)

		ret |= dwc3_process_event_buf(dwc, i);



	spin_unlock_irqrestore(&dwc->lock, flags);
@@ -3499,7 +3499,7 @@ static irqreturn_t dwc3_interrupt(int irq, void *_dwc) 
		return IRQ_HANDLED;

	}



	for (i = 0; i < dwc->num_event_buffers; i++) {

	for (i = 0; i < dwc->num_normal_event_buffers; i++) {

		irqreturn_t status;



		status = dwc3_check_event_buf(dwc, i);