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SubjectRe: [PATCH v4 2/7] usb: gadget: aspeed: read vhub properties from device tree
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On Wed, 2020-02-26 at 15:03 -0800, rentao.bupt@gmail.com wrote:
> From: Tao Ren <rentao.bupt@gmail.com>
>
> The patch introduces 2 DT properties ("aspeed,vhub-downstream-ports" and
> "aspeed,vhub-generic-endpoints") which replaces hardcoded port/endpoint
> number. It is to make it more convenient to add support for newer vhub
> revisions with different number of ports and endpoints.
>
> Signed-off-by: Tao Ren <rentao.bupt@gmail.com>
> Reviewed-by: Joel Stanley <joel@jms.id.au>

With one minor nit that can be addressed in a subsequent patch (see
below)

Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

> ---
> Changes in v4:
> - use NUM_PORTS/NUM_GEN_EPs defined in vhub.h instead of introducing
> new constants (in v3).
> Changes in v3:
> - fall back to "default" number of ports and endpoints to avoid
> breaking existing ast2400/ast2500 platforms when according device
> tree properties are not defined.
> Changes in v2:
> - removed ast_vhub_config structure and moved vhub port/endpoint
> number into device tree.
>
> drivers/usb/gadget/udc/aspeed-vhub/core.c | 68 ++++++++++++++---------
> drivers/usb/gadget/udc/aspeed-vhub/dev.c | 30 +++++++---
> drivers/usb/gadget/udc/aspeed-vhub/epn.c | 4 +-
> drivers/usb/gadget/udc/aspeed-vhub/hub.c | 15 ++---
> drivers/usb/gadget/udc/aspeed-vhub/vhub.h | 28 +++++-----
> 5 files changed, 88 insertions(+), 57 deletions(-)
>
> diff --git a/drivers/usb/gadget/udc/aspeed-vhub/core.c b/drivers/usb/gadget/udc/aspeed-vhub/core.c
> index 90b134d5dca9..f8ab8e012f34 100644
> --- a/drivers/usb/gadget/udc/aspeed-vhub/core.c
> +++ b/drivers/usb/gadget/udc/aspeed-vhub/core.c
> @@ -99,7 +99,7 @@ static irqreturn_t ast_vhub_irq(int irq, void *data)
> {
> struct ast_vhub *vhub = data;
> irqreturn_t iret = IRQ_NONE;
> - u32 istat;
> + u32 i, istat;
>
> /* Stale interrupt while tearing down */
> if (!vhub->ep0_bufs)
> @@ -121,10 +121,10 @@ static irqreturn_t ast_vhub_irq(int irq, void *data)
>
> /* Handle generic EPs first */
> if (istat & VHUB_IRQ_EP_POOL_ACK_STALL) {
> - u32 i, ep_acks = readl(vhub->regs + AST_VHUB_EP_ACK_ISR);
> + u32 ep_acks = readl(vhub->regs + AST_VHUB_EP_ACK_ISR);
> writel(ep_acks, vhub->regs + AST_VHUB_EP_ACK_ISR);
>
> - for (i = 0; ep_acks && i < AST_VHUB_NUM_GEN_EPs; i++) {
> + for (i = 0; ep_acks && i < vhub->max_epns; i++) {
> u32 mask = VHUB_EP_IRQ(i);
> if (ep_acks & mask) {
> ast_vhub_epn_ack_irq(&vhub->epns[i]);
> @@ -134,21 +134,11 @@ static irqreturn_t ast_vhub_irq(int irq, void *data)
> }
>
> /* Handle device interrupts */
> - if (istat & (VHUB_IRQ_DEVICE1 |
> - VHUB_IRQ_DEVICE2 |
> - VHUB_IRQ_DEVICE3 |
> - VHUB_IRQ_DEVICE4 |
> - VHUB_IRQ_DEVICE5)) {
> - if (istat & VHUB_IRQ_DEVICE1)
> - ast_vhub_dev_irq(&vhub->ports[0].dev);
> - if (istat & VHUB_IRQ_DEVICE2)
> - ast_vhub_dev_irq(&vhub->ports[1].dev);On Wed,
> 2020-02-26 at 15:03 -0800, rentao.bupt@gmail.com wrote:> From: Tao
> Ren <rentao.bupt@gmail.com>>
> > The patch introduces 2 DT properties ("aspeed,vhub-downstream-
> ports" and> "aspeed,vhub-generic-endpoints") which replaces hardcoded
> port/endpoint> number. It is to make it more convenient to add
> support for newer vhub> revisions with different number of ports and
> endpoints.>
> > Signed-off-by: Tao Ren <rentao.bupt@gmail.com>> Reviewed-by: Joel
> Stanley <joel@jms.id.au>> ---> Changes in v4:> - use
> NUM_PORTS/NUM_GEN_EPs defined in vhub.h instead of introducing>
> new constants (in v3).> Changes in v3:> - fall back to
> "default" number of ports and endpoints to avoid> breaking
> existing ast2400/ast2500 platforms when according device> tree
> properties are not defined.> Changes in v2:> - removed
> ast_vhub_config structure and moved vhub port/endpoint> number
> into device tree.>
> > drivers/usb/gadget/udc/aspeed-vhub/core.c | 68 ++++++++++++++-----
> ----> drivers/usb/gadget/udc/aspeed-vhub/dev.c | 30 +++++++--->
> drivers/usb/gadget/udc/aspeed-vhub/epn.c | 4 +->
> drivers/usb/gadget/udc/aspeed-vhub/hub.c | 15 ++--->
> drivers/usb/gadget/udc/aspeed-vhub/vhub.h | 28 +++++-----> 5 files
> changed, 88 insertions(+), 57 deletions(-)>
> > diff --git a/drivers/usb/gadget/udc/aspeed-vhub/core.c
> b/drivers/usb/gadget/udc/aspeed-vhub/core.c> index
> 90b134d5dca9..f8ab8e012f34 100644> ---
> a/drivers/usb/gadget/udc/aspeed-vhub/core.c> +++
> b/drivers/usb/gadget/udc/aspeed-vhub/core.c> @@ -99,7 +99,7 @@ static
> irqreturn_t ast_vhub_irq(int irq, void *data)> {> struct ast_vhub
> *vhub = data;> irqreturn_t iret = IRQ_NONE;> - u32 istat;> +
> u32 i, istat;> > /* Stale interrupt while tearing down
> */> if (!vhub->ep0_bufs)> @@ -121,10 +121,10 @@ static irqreturn_t
> ast_vhub_irq(int irq, void *data)> > /* Handle generic EPs
> first */> if (istat & VHUB_IRQ_EP_POOL_ACK_STALL) {> -
> u32 i, ep_acks = readl(vhub->regs + AST_VHUB_EP_ACK_ISR);> +
> u32 ep_acks = readl(vhub->regs + AST_VHUB_EP_ACK_ISR);>
> writel(ep_acks, vhub->regs + AST_VHUB_EP_ACK_ISR);> > -
> for (i = 0; ep_acks && i < AST_VHUB_NUM_GEN_EPs; i++) {> +
> for (i = 0; ep_acks && i < vhub->max_epns; i++) {>
> u32 mask = VHUB_EP_IRQ(i);> if (ep_acks & mask) {>
> ast_vhub_epn_ack_irq(&vhub->epns[i]);>
> @@ -134,21 +134,11 @@ static irqreturn_t ast_vhub_irq(int irq, void
> *data)> }> > /* Handle device interrupts */> - if
> (istat & (VHUB_IRQ_DEVICE1 |> - VHUB_IRQ_DEVICE2
> |> - VHUB_IRQ_DEVICE3 |> - VHUB_IRQ
> _DEVICE4 |> - VHUB_IRQ_DEVICE5)) {> - if
> (istat & VHUB_IRQ_DEVICE1)> - ast_vhub_dev_irq(&vhub-
> >ports[0].dev);> - if (istat & VHUB_IRQ_DEVICE2)> -
> ast_vhub_dev_irq(&vhub->ports[1].dev);> - if (istat &
> VHUB_IRQ_DEVICE3)> - ast_vhub_dev_irq(&vhub-
> >ports[2].dev);> - if (istat & VHUB_IRQ_DEVICE4)> -
> ast_vhub_dev_irq(&vhub->ports[3].dev);> - if (istat &
> VHUB_IRQ_DEVICE5)> - ast_vhub_dev_irq(&vhub-
> >ports[4].dev);> + for (i = 0; i < vhub->max_ports; i++) {> +
> u32 dev_mask = VHUB_IRQ_DEVICE1 << i;> +> + if
> (istat & dev_mask)> + ast_vhub_dev_irq(&vhub-
> >ports[i].dev);> }> > /* Handle top-level vHub EP0
> interrupts */> @@ -182,7 +172,7 @@ static irqreturn_t
> ast_vhub_irq(int irq, void *data)> > void ast_vhub_init_hw(struct
> ast_vhub *vhub)> {> - u32 ctrl;> + u32 ctrl, port_mask,
> epn_mask;> > UDCDBG(vhub,"(Re)Starting HW ...\n");> > @@
> -222,15 +212,20 @@ void ast_vhub_init_hw(struct ast_vhub *vhub)>
> }> > /* Reset all devices */> - writel(VHUB_SW_RESET_
> ALL, vhub->regs + AST_VHUB_SW_RESET);> + port_mask =
> GENMASK(vhub->max_ports, 1);> + writel(VHUB_SW_RESET_ROOT_HUB
> |> + VHUB_SW_RESET_DMA_CONTROLLER |> + VHUB_SW_RESET_
> EP_POOL |> + port_mask, vhub->regs + AST_VHUB_SW_RESET);>
> udelay(1);> writel(0, vhub->regs + AST_VHUB_SW_RESET);> > /*
> Disable and cleanup EP ACK/NACK interrupts */> + epn_mask =
> GENMASK(vhub->max_epns - 1, 0);> writel(0, vhub->regs +
> AST_VHUB_EP_ACK_IER);> writel(0, vhub->regs +
> AST_VHUB_EP_NACK_IER);> - writel(VHUB_EP_IRQ_ALL, vhub->regs +
> AST_VHUB_EP_ACK_ISR);> - writel(VHUB_EP_IRQ_ALL, vhub->regs +
> AST_VHUB_EP_NACK_ISR);> + writel(epn_mask, vhub->regs +
> AST_VHUB_EP_ACK_ISR);> + writel(epn_mask, vhub->regs +
> AST_VHUB_EP_NACK_ISR);> > /* Default settings for EP0, enable HW
> hub EP1 */> writel(0, vhub->regs + AST_VHUB_EP0_CTRL);> @@ -273,7
> +268,7 @@ static int ast_vhub_remove(struct platform_device *pdev)>
> return 0;> > /* Remove devices */> - for (i = 0; i <
> AST_VHUB_NUM_PORTS; i++)> + for (i = 0; i < vhub->max_ports; i++)>
> ast_vhub_del_dev(&vhub->ports[i].dev);> > spin_
> lock_irqsave(&vhub->lock, flags);> @@ -295,7 +290,7 @@ static int
> ast_vhub_remove(struct platform_device *pdev)> if (vhub-
> >ep0_bufs)> dma_free_coherent(&pdev->dev,>
> AST_VHUB_EP0_MAX_PACKET *> - (AS
> T_VHUB_NUM_PORTS + 1),> + (vhub-
> >max_ports + 1),> vhub->ep0_bufs,>
> vhub->ep0_bufs_dma);> vhub->ep0_bufs =
> NULL;> @@ -309,11 +304,32 @@ static int ast_vhub_probe(struct
> platform_device *pdev)> struct ast_vhub *vhub;> struct
> resource *res;> int i, rc = 0;> + const struct device_node *np
> = pdev->dev.of_node;> > vhub = devm_kzalloc(&pdev->dev,
> sizeof(*vhub), GFP_KERNEL);> if (!vhub)> retur
> n -ENOMEM;> > + rc = of_property_read_u32(np, "aspeed,vhub-
> downstream-ports",> + &vhub->max_ports);> +
> if (rc < 0)> + vhub->max_ports =
> AST_VHUB_NUM_PORTS;> +> + vhub->ports = devm_kcalloc(&pdev->dev,
> vhub->max_ports,> + sizeof(*vhub-
> >ports), GFP_KERNEL);> + if (!vhub->ports)> + retur
> n -ENOMEM;> +> + rc = of_property_read_u32(np, "aspeed,vhub-
> generic-endpoints",> + &vhub-
> >max_epns);> + if (rc < 0)> + vhub->max_epns =
> AST_VHUB_NUM_GEN_EPs;> +> + vhub->epns = devm_kcalloc(&pdev->dev,
> vhub->max_epns,> + sizeof(*vhub->epns),
> GFP_KERNEL);> + if (!vhub->epns)> + return
> -ENOMEM;> +> spin_lock_init(&vhub->lock);> vhub->pdev =
> pdev;> > @@ -366,7 +382,7 @@ static int ast_vhub_probe(struct
> platform_device *pdev)> */> vhub->ep0_bufs =
> dma_alloc_coherent(&pdev->dev,>
> AST_VHUB_EP0_MAX_PACKET *> -
> (AST_VHUB_NUM_PORTS + 1),> +
> (vhub->max_ports + 1),> &vh
> ub->ep0_bufs_dma, GFP_KERNEL);> if (!vhub->ep0_bufs) {>
> dev_err(&pdev->dev, "Failed to allocate EP0 DMA buffers\n");> @@
> -380,7 +396,7 @@ static int ast_vhub_probe(struct platform_device
> *pdev)> ast_vhub_init_ep0(vhub, &vhub->ep0, NULL);> > /*
> Init devices */> - for (i = 0; i < AST_VHUB_NUM_PORTS && rc == 0;
> i++)> + for (i = 0; i < vhub->max_ports && rc == 0; i++)>
> rc = ast_vhub_init_dev(vhub, i);> if (rc)>
> goto err;> diff --git a/drivers/usb/gadget/udc/aspeed-vhub/dev.c
> b/drivers/usb/gadget/udc/aspeed-vhub/dev.c> index
> 4008e7a51188..d268306a7bfe 100644> ---
> a/drivers/usb/gadget/udc/aspeed-vhub/dev.c> +++
> b/drivers/usb/gadget/udc/aspeed-vhub/dev.c> @@ -77,7 +77,7 @@ static
> void ast_vhub_dev_enable(struct ast_vhub_dev *d)> writel(d-
> >ep0.buf_dma, d->regs + AST_VHUB_DEV_EP0_DATA);> > /* Clear stall
> on all EPs */> - for (i = 0; i < AST_VHUB_NUM_GEN_EPs; i++) {> +
> for (i = 0; i < d->max_epns; i++) {> struct
> ast_vhub_ep *ep = d->epns[i];> > if (ep && (ep-
> >epn.stalled || ep->epn.wedged)) {> @@ -137,7 +137,7 @@ static int
> ast_vhub_ep_feature(struct ast_vhub_dev *d,> is_set ?
> "SET" : "CLEAR", ep_num, wValue);> if (ep_num == 0)>
> return std_req_complete;> - if (ep_num >= AST_VHUB_NUM_GEN_EPs ||
> !d->epns[ep_num - 1])> + if (ep_num >= d->max_epns || !d-
> >epns[ep_num - 1])> return std_req_stall;> if (wValue !=
> USB_ENDPOINT_HALT)> return std_req_driver;> @@ -181,7
> +181,7 @@ static int ast_vhub_ep_status(struct ast_vhub_dev *d,> >
> DDBG(d, "GET_STATUS(ep%d)\n", ep_num);> > - if (ep_num >=
> AST_VHUB_NUM_GEN_EPs)> + if (ep_num >= d->max_epns)>
> return std_req_stall;> if (ep_num != 0) {> ep =
> d->epns[ep_num - 1];> @@ -299,7 +299,7 @@ static void
> ast_vhub_dev_nuke(struct ast_vhub_dev *d)> {> unsigned int
> i;> > - for (i = 0; i < AST_VHUB_NUM_GEN_EPs; i++) {> + for
> (i = 0; i < d->max_epns; i++) {> if (!d->epns[i])>
> continue;> ast_vhub_nuke(d->epns[i],
> -ESHUTDOWN);> @@ -416,10 +416,10 @@ static struct usb_ep
> *ast_vhub_udc_match_ep(struct usb_gadget *gadget,> * that will
> allow the generic code to use our> * assigned address.> */>
> - for (i = 0; i < AST_VHUB_NUM_GEN_EPs; i++)> + for (i = 0; i
> < d->max_epns; i++)> if (d->epns[i] == NULL)>
> break;> - if (i >= AST_VHUB_NUM_GEN_EPs)> + if (i
> >= d->max_epns)> return NULL;> addr = i + 1;> > @@
> -526,6 +526,7 @@ void ast_vhub_del_dev(struct ast_vhub_dev *d)> >
> usb_del_gadget_udc(&d->gadget);> device_unregister(d-
> >port_dev);> + kfree(d->epns);> }> > static void
> ast_vhub_dev_release(struct device *dev)> @@ -546,14 +547,25 @@ int
> ast_vhub_init_dev(struct ast_vhub *vhub, unsigned int idx)> >
> ast_vhub_init_ep0(vhub, &d->ep0, d);> > + /*> + * A USB
> device can have up to 30 endpoints besides control> + * endpoint 0.>
> + */> + d->max_epns = min_t(u32, vhub->max_epns, 30);> +
> d->epns = kcalloc(d->max_epns, sizeof(*d->epns), GFP_KERNEL);> +
> if (!d->epns)> + return -ENOMEM;> +> /*> *
> The UDC core really needs us to have separate and uniquely> *
> named "parent" devices for each port so we create a sub device>
> * here for that purpose> */> d->port_dev =
> kzalloc(sizeof(struct device), GFP_KERNEL);> - if (!d-
> >port_dev)> - return -ENOMEM;> + if (!d->port_dev) {>
> + rc = -ENOMEM;> + goto fail_alloc;> + }>
> device_initialize(d->port_dev);> d->port_dev->release =
> ast_vhub_dev_release;> d->port_dev->parent = parent;> @@
> -584,6 +596,8 @@ int ast_vhub_init_dev(struct ast_vhub *vhub,
> unsigned int idx)> device_del(d->port_dev);> fail_add:> put_d
> evice(d->port_dev);> + fail_alloc:> + kfree(d->epns);> > retur
> n rc;> }> diff --git a/drivers/usb/gadget/udc/aspeed-vhub/epn.c
> b/drivers/usb/gadget/udc/aspeed-vhub/epn.c> index
> 7475c74aa5c5..0bd6b20435b8 100644> ---
> a/drivers/usb/gadget/udc/aspeed-vhub/epn.c> +++
> b/drivers/usb/gadget/udc/aspeed-vhub/epn.c> @@ -800,10 +800,10 @@
> struct ast_vhub_ep *ast_vhub_alloc_epn(struct ast_vhub_dev *d, u8
> addr)> > /* Find a free one (no device) */> spin_lock_irq
> save(&vhub->lock, flags);> - for (i = 0; i < AST_VHUB_NUM_GEN_EPs;
> i++)> + for (i = 0; i < vhub->max_epns; i++)> if
> (vhub->epns[i].dev == NULL)> break;> - if (i
> >= AST_VHUB_NUM_GEN_EPs) {> + if (i >= vhub->max_epns) {>
> spin_unlock_irqrestore(&vhub->lock, flags);> return
> NULL;> }> diff --git a/drivers/usb/gadget/udc/aspeed-
> vhub/hub.c b/drivers/usb/gadget/udc/aspeed-vhub/hub.c> index
> 9c3027306b15..6e565c3dbb5b 100644> ---
> a/drivers/usb/gadget/udc/aspeed-vhub/hub.c> +++
> b/drivers/usb/gadget/udc/aspeed-vhub/hub.c> @@ -502,7 +502,7 @@
> static void ast_vhub_wake_work(struct work_struct *work)> * we
> let the normal host wake path deal with it later.> */> spin_
> lock_irqsave(&vhub->lock, flags);> - for (i = 0; i <
> AST_VHUB_NUM_PORTS; i++) {> + for (i = 0; i < vhub->max_ports; i++)
> {> struct ast_vhub_port *p = &vhub->ports[i];> >
> if (!(p->status & USB_PORT_STAT_SUSPEND))> @@ -585,7 +585,7 @@ static
> enum std_req_rc ast_vhub_set_port_feature(struct ast_vhub_ep *ep,>
> struct ast_vhub *vhub = ep->vhub;> struct ast_vhub_port *p;> > -
> if (port == 0 || port > AST_VHUB_NUM_PORTS)> + if (port == 0
> || port > vhub->max_ports)> return std_req_stall;> port-
> -;> p = &vhub->ports[port];> @@ -628,7 +628,7 @@ static enum
> std_req_rc ast_vhub_clr_port_feature(struct ast_vhub_ep *ep,>
> struct ast_vhub *vhub = ep->vhub;> struct ast_vhub_port *p;> > -
> if (port == 0 || port > AST_VHUB_NUM_PORTS)> + if (port == 0
> || port > vhub->max_ports)> return std_req_stall;> port-
> -;> p = &vhub->ports[port];> @@ -674,7 +674,7 @@ static enum
> std_req_rc ast_vhub_get_port_stat(struct ast_vhub_ep *ep,> struct
> ast_vhub *vhub = ep->vhub;> u16 stat, chg;> > - if (port == 0
> || port > AST_VHUB_NUM_PORTS)> + if (port == 0 || port > vhub-
> >max_ports)> return std_req_stall;> port--;> >
> @@ -755,7 +755,7 @@ void ast_vhub_hub_suspend(struct ast_vhub *vhub)>
> * Forward to unsuspended ports without changing> *
> their connection status.> */> - for (i = 0; i <
> AST_VHUB_NUM_PORTS; i++) {> + for (i = 0; i < vhub->max_ports; i++)
> {> struct ast_vhub_port *p = &vhub->ports[i];> >
> if (!(p->status & USB_PORT_STAT_SUSPEND))> @@ -778,7 +778,7 @@ void
> ast_vhub_hub_resume(struct ast_vhub *vhub)> * Forward to
> unsuspended ports without changing> * their connection status.>
> */> - for (i = 0; i < AST_VHUB_NUM_PORTS; i++) {> + for
> (i = 0; i < vhub->max_ports; i++) {> struct
> ast_vhub_port *p = &vhub->ports[i];> > if (!(p->status
> & USB_PORT_STAT_SUSPEND))> @@ -812,7 +812,7 @@ void
> ast_vhub_hub_reset(struct ast_vhub *vhub)> * Clear all port
> status, disable gadgets and "suspend"> * them. They will be
> woken up by a port reset.> */> - for (i = 0; i <
> AST_VHUB_NUM_PORTS; i++) {> + for (i = 0; i < vhub->max_ports; i++)
> {> struct ast_vhub_port *p = &vhub->ports[i];> >
> /* Only keep the connected flag */> @@ -845,6 +845,7 @@ static void
> ast_vhub_init_desc(struct ast_vhub *vhub)> /* Initialize vhub Hub
> Descriptor. */> memcpy(&vhub->vhub_hub_desc,
> &ast_vhub_hub_desc,> sizeof(vhub->vhub_hub_desc));>
> + vhub->vhub_hub_desc.bNbrPorts = vhub->max_ports;> > /*
> Initialize vhub String Descriptors. */> memcpy(&vhub-
> >vhub_str_desc, &ast_vhub_strings,> diff --git
> a/drivers/usb/gadget/udc/aspeed-vhub/vhub.h
> b/drivers/usb/gadget/udc/aspeed-vhub/vhub.h> index
> 191f9fae7420..fac79ef6d669 100644> ---
> a/drivers/usb/gadget/udc/aspeed-vhub/vhub.h> +++
> b/drivers/usb/gadget/udc/aspeed-vhub/vhub.h> @@ -79,17 +79,9 @@>
> #define VHUB_SW_RESET_DEVICE2 (1 << 2)>
> #define VHUB_SW_RESET_DEVICE1 (1 << 1)>
> #define VHUB_SW_RESET_ROOT_HUB (1 << 0)>
> -#define VHUB_SW_RESET_ALL (VHUB_SW_RESET_EP_POOL
> | \> - VHUB_SW_RESET_
> DMA_CONTROLLER | \> - VHUB_S
> W_RESET_DEVICE5 | \> -
> VHUB_SW_RESET_DEVICE4 | \> -
> VHUB_SW_RESET_DEVICE3 | \> -
> VHUB_SW_RESET_DEVICE2 | \> -
> VHUB_SW_RESET_DEVICE1 | \> -
> VHUB_SW_RESET_ROOT_HUB)> +> /* EP ACK/NACK IRQ masks */> #define
> VHUB_EP_IRQ(n) (1 << (n))> -#define
> VHUB_EP_IRQ_ALL 0x7fff /* 15 EPs */>
> > /* USB status reg */> #define VHUB_USBSTS_HISPEED
> (1 << 27)> @@ -213,6 +205,11 @@>
> * *>
> ****************************************/> > +/*> + *
> AST_VHUB_NUM_GEN_EPs and AST_VHUB_NUM_PORTS are kept to avoid
> breaking> + * existing AST2400/AST2500 platforms. AST2600 and future
> vhub revisions> + * should define number of downstream ports and
> endpoints in device tree.> + */> #define AST_VHUB_NUM_GEN_EPs
> 15 /* Generic non-0 EPs */> #define AST_VHUB_NUM_PORTS 5
> /* vHub ports */> #define AST_VHUB_EP0_MAX_PACKET 64 /*
> EP0's max packet size */> @@ -315,7 +312,7 @@ struct ast_vhub_ep {>
> /* Registers */> void
> __iomem *regs;> > - /* Index in
> global pool (0..14) */> + /* Index in global pool
> (zero-based) */> unsigned int g_idx
> ;> > /* DMA Descriptors */> @@ -345,7 +342,7
> @@ struct ast_vhub_dev {> struct ast_vhub *vhub
> ;> void __iomem *regs;> > - /* Device
> index (0...4) and name string */> + /* Device index (zero-based)
> and name string */> unsigned int index;>
> const char *name;> > @@ -361,7 +358,8 @@ struct
> ast_vhub_dev {> > /* Endpoint structures */> struct
> ast_vhub_ep ep0;> - struct ast_vhub_ep *epns
> [AST_VHUB_NUM_GEN_EPs];> + struct ast_vhub_ep **epn
> s;> + u32 max_epns;> > };> #define
> to_ast_dev(__g) container_of(__g, struct ast_vhub_dev, gadget)> @@
> -402,10 +400,12 @@ struct ast_vhub {> bool
> ep1_stalled : 1;> > /* Per-port info */> - struct
> ast_vhub_port ports[AST_VHUB_NUM_PORTS];> + struct
> ast_vhub_port *ports;> + u32
> max_ports;> > /* Generic EP data structures */> - struc
> t ast_vhub_ep epns[AST_VHUB_NUM_GEN_EPs];> + struct
> ast_vhub_ep *epns;> + u32 max_e
> pns;> > /* Upstream bus is suspended ? */> bool
> suspended : 1;
> - if (istat & VHUB_IRQ_DEVICE3)
> - ast_vhub_dev_irq(&vhub->ports[2].dev);
> - if (istat & VHUB_IRQ_DEVICE4)
> - ast_vhub_dev_irq(&vhub->ports[3].dev);
> - if (istat & VHUB_IRQ_DEVICE5)
> - ast_vhub_dev_irq(&vhub->ports[4].dev);
> + for (i = 0; i < vhub->max_ports; i++) {
> + u32 dev_mask = VHUB_IRQ_DEVICE1 << i;
> +
> + if (istat & dev_mask)
> + ast_vhub_dev_irq(&vhub->ports[i].dev);
> }

The 2400 and 2500 have very slow cores and every cycle counts in that
interrupt handler from my experience. I would sugggest you generate a
"mask" of all the device interrupts for enabled ports in struct vhub
and AND istat with that mask before going through the loop. Either that
or use find_next_zero_bit...

I wouldn't gate merging this patch on this, it can be a subsequent
refinement.

> /* Handle top-level vHub EP0 interrupts */
> @@ -182,7 +172,7 @@ static irqreturn_t ast_vhub_irq(int irq, void *data)
>
> void ast_vhub_init_hw(struct ast_vhub *vhub)
> {
> - u32 ctrl;
> + u32 ctrl, port_mask, epn_mask;
>
> UDCDBG(vhub,"(Re)Starting HW ...\n");
>
> @@ -222,15 +212,20 @@ void ast_vhub_init_hw(struct ast_vhub *vhub)
> }
>
> /* Reset all devices */
> - writel(VHUB_SW_RESET_ALL, vhub->regs + AST_VHUB_SW_RESET);
> + port_mask = GENMASK(vhub->max_ports, 1);
> + writel(VHUB_SW_RESET_ROOT_HUB |
> + VHUB_SW_RESET_DMA_CONTROLLER |
> + VHUB_SW_RESET_EP_POOL |
> + port_mask, vhub->regs + AST_VHUB_SW_RESET);
> udelay(1);
> writel(0, vhub->regs + AST_VHUB_SW_RESET);
>
> /* Disable and cleanup EP ACK/NACK interrupts */
> + epn_mask = GENMASK(vhub->max_epns - 1, 0);
> writel(0, vhub->regs + AST_VHUB_EP_ACK_IER);
> writel(0, vhub->regs + AST_VHUB_EP_NACK_IER);
> - writel(VHUB_EP_IRQ_ALL, vhub->regs + AST_VHUB_EP_ACK_ISR);
> - writel(VHUB_EP_IRQ_ALL, vhub->regs + AST_VHUB_EP_NACK_ISR);
> + writel(epn_mask, vhub->regs + AST_VHUB_EP_ACK_ISR);
> + writel(epn_mask, vhub->regs + AST_VHUB_EP_NACK_ISR);
>
> /* Default settings for EP0, enable HW hub EP1 */
> writel(0, vhub->regs + AST_VHUB_EP0_CTRL);
> @@ -273,7 +268,7 @@ static int ast_vhub_remove(struct platform_device *pdev)
> return 0;
>
> /* Remove devices */
> - for (i = 0; i < AST_VHUB_NUM_PORTS; i++)
> + for (i = 0; i < vhub->max_ports; i++)
> ast_vhub_del_dev(&vhub->ports[i].dev);
>
> spin_lock_irqsave(&vhub->lock, flags);
> @@ -295,7 +290,7 @@ static int ast_vhub_remove(struct platform_device *pdev)
> if (vhub->ep0_bufs)
> dma_free_coherent(&pdev->dev,
> AST_VHUB_EP0_MAX_PACKET *
> - (AST_VHUB_NUM_PORTS + 1),
> + (vhub->max_ports + 1),
> vhub->ep0_bufs,
> vhub->ep0_bufs_dma);
> vhub->ep0_bufs = NULL;
> @@ -309,11 +304,32 @@ static int ast_vhub_probe(struct platform_device *pdev)
> struct ast_vhub *vhub;
> struct resource *res;
> int i, rc = 0;
> + const struct device_node *np = pdev->dev.of_node;
>
> vhub = devm_kzalloc(&pdev->dev, sizeof(*vhub), GFP_KERNEL);
> if (!vhub)
> return -ENOMEM;
>
> + rc = of_property_read_u32(np, "aspeed,vhub-downstream-ports",
> + &vhub->max_ports);
> + if (rc < 0)
> + vhub->max_ports = AST_VHUB_NUM_PORTS;
> +
> + vhub->ports = devm_kcalloc(&pdev->dev, vhub->max_ports,
> + sizeof(*vhub->ports), GFP_KERNEL);
> + if (!vhub->ports)
> + return -ENOMEM;
> +
> + rc = of_property_read_u32(np, "aspeed,vhub-generic-endpoints",
> + &vhub->max_epns);
> + if (rc < 0)
> + vhub->max_epns = AST_VHUB_NUM_GEN_EPs;
> +
> + vhub->epns = devm_kcalloc(&pdev->dev, vhub->max_epns,
> + sizeof(*vhub->epns), GFP_KERNEL);
> + if (!vhub->epns)
> + return -ENOMEM;
> +
> spin_lock_init(&vhub->lock);
> vhub->pdev = pdev;
>
> @@ -366,7 +382,7 @@ static int ast_vhub_probe(struct platform_device *pdev)
> */
> vhub->ep0_bufs = dma_alloc_coherent(&pdev->dev,
> AST_VHUB_EP0_MAX_PACKET *
> - (AST_VHUB_NUM_PORTS + 1),
> + (vhub->max_ports + 1),
> &vhub->ep0_bufs_dma, GFP_KERNEL);
> if (!vhub->ep0_bufs) {
> dev_err(&pdev->dev, "Failed to allocate EP0 DMA buffers\n");
> @@ -380,7 +396,7 @@ static int ast_vhub_probe(struct platform_device *pdev)
> ast_vhub_init_ep0(vhub, &vhub->ep0, NULL);
>
> /* Init devices */
> - for (i = 0; i < AST_VHUB_NUM_PORTS && rc == 0; i++)
> + for (i = 0; i < vhub->max_ports && rc == 0; i++)
> rc = ast_vhub_init_dev(vhub, i);
> if (rc)
> goto err;
> diff --git a/drivers/usb/gadget/udc/aspeed-vhub/dev.c b/drivers/usb/gadget/udc/aspeed-vhub/dev.c
> index 4008e7a51188..d268306a7bfe 100644
> --- a/drivers/usb/gadget/udc/aspeed-vhub/dev.c
> +++ b/drivers/usb/gadget/udc/aspeed-vhub/dev.c
> @@ -77,7 +77,7 @@ static void ast_vhub_dev_enable(struct ast_vhub_dev *d)
> writel(d->ep0.buf_dma, d->regs + AST_VHUB_DEV_EP0_DATA);
>
> /* Clear stall on all EPs */
> - for (i = 0; i < AST_VHUB_NUM_GEN_EPs; i++) {
> + for (i = 0; i < d->max_epns; i++) {
> struct ast_vhub_ep *ep = d->epns[i];
>
> if (ep && (ep->epn.stalled || ep->epn.wedged)) {
> @@ -137,7 +137,7 @@ static int ast_vhub_ep_feature(struct ast_vhub_dev *d,
> is_set ? "SET" : "CLEAR", ep_num, wValue);
> if (ep_num == 0)
> return std_req_complete;
> - if (ep_num >= AST_VHUB_NUM_GEN_EPs || !d->epns[ep_num - 1])
> + if (ep_num >= d->max_epns || !d->epns[ep_num - 1])
> return std_req_stall;
> if (wValue != USB_ENDPOINT_HALT)
> return std_req_driver;
> @@ -181,7 +181,7 @@ static int ast_vhub_ep_status(struct ast_vhub_dev *d,
>
> DDBG(d, "GET_STATUS(ep%d)\n", ep_num);
>
> - if (ep_num >= AST_VHUB_NUM_GEN_EPs)
> + if (ep_num >= d->max_epns)
> return std_req_stall;
> if (ep_num != 0) {
> ep = d->epns[ep_num - 1];
> @@ -299,7 +299,7 @@ static void ast_vhub_dev_nuke(struct ast_vhub_dev *d)
> {
> unsigned int i;
>
> - for (i = 0; i < AST_VHUB_NUM_GEN_EPs; i++) {
> + for (i = 0; i < d->max_epns; i++) {
> if (!d->epns[i])
> continue;
> ast_vhub_nuke(d->epns[i], -ESHUTDOWN);
> @@ -416,10 +416,10 @@ static struct usb_ep *ast_vhub_udc_match_ep(struct usb_gadget *gadget,
> * that will allow the generic code to use our
> * assigned address.
> */
> - for (i = 0; i < AST_VHUB_NUM_GEN_EPs; i++)
> + for (i = 0; i < d->max_epns; i++)
> if (d->epns[i] == NULL)
> break;
> - if (i >= AST_VHUB_NUM_GEN_EPs)
> + if (i >= d->max_epns)
> return NULL;
> addr = i + 1;
>
> @@ -526,6 +526,7 @@ void ast_vhub_del_dev(struct ast_vhub_dev *d)
>
> usb_del_gadget_udc(&d->gadget);
> device_unregister(d->port_dev);
> + kfree(d->epns);
> }
>
> static void ast_vhub_dev_release(struct device *dev)
> @@ -546,14 +547,25 @@ int ast_vhub_init_dev(struct ast_vhub *vhub, unsigned int idx)
>
> ast_vhub_init_ep0(vhub, &d->ep0, d);
>
> + /*
> + * A USB device can have up to 30 endpoints besides control
> + * endpoint 0.
> + */
> + d->max_epns = min_t(u32, vhub->max_epns, 30);
> + d->epns = kcalloc(d->max_epns, sizeof(*d->epns), GFP_KERNEL);
> + if (!d->epns)
> + return -ENOMEM;
> +
> /*
> * The UDC core really needs us to have separate and uniquely
> * named "parent" devices for each port so we create a sub device
> * here for that purpose
> */
> d->port_dev = kzalloc(sizeof(struct device), GFP_KERNEL);
> - if (!d->port_dev)
> - return -ENOMEM;
> + if (!d->port_dev) {
> + rc = -ENOMEM;
> + goto fail_alloc;
> + }
> device_initialize(d->port_dev);
> d->port_dev->release = ast_vhub_dev_release;
> d->port_dev->parent = parent;
> @@ -584,6 +596,8 @@ int ast_vhub_init_dev(struct ast_vhub *vhub, unsigned int idx)
> device_del(d->port_dev);
> fail_add:
> put_device(d->port_dev);
> + fail_alloc:
> + kfree(d->epns);
>
> return rc;
> }
> diff --git a/drivers/usb/gadget/udc/aspeed-vhub/epn.c b/drivers/usb/gadget/udc/aspeed-vhub/epn.c
> index 7475c74aa5c5..0bd6b20435b8 100644
> --- a/drivers/usb/gadget/udc/aspeed-vhub/epn.c
> +++ b/drivers/usb/gadget/udc/aspeed-vhub/epn.c
> @@ -800,10 +800,10 @@ struct ast_vhub_ep *ast_vhub_alloc_epn(struct ast_vhub_dev *d, u8 addr)
>
> /* Find a free one (no device) */
> spin_lock_irqsave(&vhub->lock, flags);
> - for (i = 0; i < AST_VHUB_NUM_GEN_EPs; i++)
> + for (i = 0; i < vhub->max_epns; i++)
> if (vhub->epns[i].dev == NULL)
> break;
> - if (i >= AST_VHUB_NUM_GEN_EPs) {
> + if (i >= vhub->max_epns) {
> spin_unlock_irqrestore(&vhub->lock, flags);
> return NULL;
> }
> diff --git a/drivers/usb/gadget/udc/aspeed-vhub/hub.c b/drivers/usb/gadget/udc/aspeed-vhub/hub.c
> index 9c3027306b15..6e565c3dbb5b 100644
> --- a/drivers/usb/gadget/udc/aspeed-vhub/hub.c
> +++ b/drivers/usb/gadget/udc/aspeed-vhub/hub.c
> @@ -502,7 +502,7 @@ static void ast_vhub_wake_work(struct work_struct *work)
> * we let the normal host wake path deal with it later.
> */
> spin_lock_irqsave(&vhub->lock, flags);
> - for (i = 0; i < AST_VHUB_NUM_PORTS; i++) {
> + for (i = 0; i < vhub->max_ports; i++) {
> struct ast_vhub_port *p = &vhub->ports[i];
>
> if (!(p->status & USB_PORT_STAT_SUSPEND))
> @@ -585,7 +585,7 @@ static enum std_req_rc ast_vhub_set_port_feature(struct ast_vhub_ep *ep,
> struct ast_vhub *vhub = ep->vhub;
> struct ast_vhub_port *p;
>
> - if (port == 0 || port > AST_VHUB_NUM_PORTS)
> + if (port == 0 || port > vhub->max_ports)
> return std_req_stall;
> port--;
> p = &vhub->ports[port];
> @@ -628,7 +628,7 @@ static enum std_req_rc ast_vhub_clr_port_feature(struct ast_vhub_ep *ep,
> struct ast_vhub *vhub = ep->vhub;
> struct ast_vhub_port *p;
>
> - if (port == 0 || port > AST_VHUB_NUM_PORTS)
> + if (port == 0 || port > vhub->max_ports)
> return std_req_stall;
> port--;
> p = &vhub->ports[port];
> @@ -674,7 +674,7 @@ static enum std_req_rc ast_vhub_get_port_stat(struct ast_vhub_ep *ep,
> struct ast_vhub *vhub = ep->vhub;
> u16 stat, chg;
>
> - if (port == 0 || port > AST_VHUB_NUM_PORTS)
> + if (port == 0 || port > vhub->max_ports)
> return std_req_stall;
> port--;
>
> @@ -755,7 +755,7 @@ void ast_vhub_hub_suspend(struct ast_vhub *vhub)
> * Forward to unsuspended ports without changing
> * their connection status.
> */
> - for (i = 0; i < AST_VHUB_NUM_PORTS; i++) {
> + for (i = 0; i < vhub->max_ports; i++) {
> struct ast_vhub_port *p = &vhub->ports[i];
>
> if (!(p->status & USB_PORT_STAT_SUSPEND))
> @@ -778,7 +778,7 @@ void ast_vhub_hub_resume(struct ast_vhub *vhub)
> * Forward to unsuspended ports without changing
> * their connection status.
> */
> - for (i = 0; i < AST_VHUB_NUM_PORTS; i++) {
> + for (i = 0; i < vhub->max_ports; i++) {
> struct ast_vhub_port *p = &vhub->ports[i];
>
> if (!(p->status & USB_PORT_STAT_SUSPEND))
> @@ -812,7 +812,7 @@ void ast_vhub_hub_reset(struct ast_vhub *vhub)
> * Clear all port status, disable gadgets and "suspend"
> * them. They will be woken up by a port reset.
> */
> - for (i = 0; i < AST_VHUB_NUM_PORTS; i++) {
> + for (i = 0; i < vhub->max_ports; i++) {
> struct ast_vhub_port *p = &vhub->ports[i];
>
> /* Only keep the connected flag */
> @@ -845,6 +845,7 @@ static void ast_vhub_init_desc(struct ast_vhub *vhub)
> /* Initialize vhub Hub Descriptor. */
> memcpy(&vhub->vhub_hub_desc, &ast_vhub_hub_desc,
> sizeof(vhub->vhub_hub_desc));
> + vhub->vhub_hub_desc.bNbrPorts = vhub->max_ports;
>
> /* Initialize vhub String Descriptors. */
> memcpy(&vhub->vhub_str_desc, &ast_vhub_strings,
> diff --git a/drivers/usb/gadget/udc/aspeed-vhub/vhub.h b/drivers/usb/gadget/udc/aspeed-vhub/vhub.h
> index 191f9fae7420..fac79ef6d669 100644
> --- a/drivers/usb/gadget/udc/aspeed-vhub/vhub.h
> +++ b/drivers/usb/gadget/udc/aspeed-vhub/vhub.h
> @@ -79,17 +79,9 @@
> #define VHUB_SW_RESET_DEVICE2 (1 << 2)
> #define VHUB_SW_RESET_DEVICE1 (1 << 1)
> #define VHUB_SW_RESET_ROOT_HUB (1 << 0)
> -#define VHUB_SW_RESET_ALL (VHUB_SW_RESET_EP_POOL | \
> - VHUB_SW_RESET_DMA_CONTROLLER | \
> - VHUB_SW_RESET_DEVICE5 | \
> - VHUB_SW_RESET_DEVICE4 | \
> - VHUB_SW_RESET_DEVICE3 | \
> - VHUB_SW_RESET_DEVICE2 | \
> - VHUB_SW_RESET_DEVICE1 | \
> - VHUB_SW_RESET_ROOT_HUB)
> +
> /* EP ACK/NACK IRQ masks */
> #define VHUB_EP_IRQ(n) (1 << (n))
> -#define VHUB_EP_IRQ_ALL 0x7fff /* 15 EPs */
>
> /* USB status reg */
> #define VHUB_USBSTS_HISPEED (1 << 27)
> @@ -213,6 +205,11 @@
> * *
> ****************************************/
>
> +/*
> + * AST_VHUB_NUM_GEN_EPs and AST_VHUB_NUM_PORTS are kept to avoid breaking
> + * existing AST2400/AST2500 platforms. AST2600 and future vhub revisions
> + * should define number of downstream ports and endpoints in device tree.
> + */
> #define AST_VHUB_NUM_GEN_EPs 15 /* Generic non-0 EPs */
> #define AST_VHUB_NUM_PORTS 5 /* vHub ports */
> #define AST_VHUB_EP0_MAX_PACKET 64 /* EP0's max packet size */
> @@ -315,7 +312,7 @@ struct ast_vhub_ep {
> /* Registers */
> void __iomem *regs;
>
> - /* Index in global pool (0..14) */
> + /* Index in global pool (zero-based) */
> unsigned int g_idx;
>
> /* DMA Descriptors */
> @@ -345,7 +342,7 @@ struct ast_vhub_dev {
> struct ast_vhub *vhub;
> void __iomem *regs;
>
> - /* Device index (0...4) and name string */
> + /* Device index (zero-based) and name string */
> unsigned int index;
> const char *name;
>
> @@ -361,7 +358,8 @@ struct ast_vhub_dev {
>
> /* Endpoint structures */
> struct ast_vhub_ep ep0;
> - struct ast_vhub_ep *epns[AST_VHUB_NUM_GEN_EPs];
> + struct ast_vhub_ep **epns;
> + u32 max_epns;
>
> };
> #define to_ast_dev(__g) container_of(__g, struct ast_vhub_dev, gadget)
> @@ -402,10 +400,12 @@ struct ast_vhub {
> bool ep1_stalled : 1;
>
> /* Per-port info */
> - struct ast_vhub_port ports[AST_VHUB_NUM_PORTS];
> + struct ast_vhub_port *ports;
> + u32 max_ports;
>
> /* Generic EP data structures */
> - struct ast_vhub_ep epns[AST_VHUB_NUM_GEN_EPs];
> + struct ast_vhub_ep *epns;
> + u32 max_epns;
>
> /* Upstream bus is suspended ? */
> bool suspended : 1;

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