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Date: Wed, 12 Apr 2023 17:05:24 +0200
From: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
To: Michael Ellerman <mpe@...erman.id.au>,
Anatolij Gustschin <agust@...x.de>
Cc: Nicholas Piggin <npiggin@...il.com>,
Christophe Leroy <christophe.leroy@...roup.eu>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc/mpc52xx_lpbfifo: Drop unused functions
On Wed, Dec 28, 2022 at 03:51:29PM +0100, Uwe Kleine-König wrote:
> The four exported functions mpc52xx_lpbfifo_submit(),
> mpc52xx_lpbfifo_abort(), mpc52xx_lpbfifo_poll(), and
> mpc52xx_lpbfifo_start_xfer() are not used. So they can be dropped and the
> definitions needed to call them can be moved into the driver file.
>
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
I never got feedback about this driver and it has not appeared in next
up to now. Did it fell through the cracks?
Best regards
Uwe
> ---
> arch/powerpc/include/asm/mpc52xx.h | 41 ------
> arch/powerpc/platforms/52xx/mpc52xx_lpbfifo.c | 134 +++++-------------
> 2 files changed, 33 insertions(+), 142 deletions(-)
>
> diff --git a/arch/powerpc/include/asm/mpc52xx.h b/arch/powerpc/include/asm/mpc52xx.h
> index 5ea16a71c2f0..01ae6c351e50 100644
> --- a/arch/powerpc/include/asm/mpc52xx.h
> +++ b/arch/powerpc/include/asm/mpc52xx.h
> @@ -285,47 +285,6 @@ extern int mpc52xx_gpt_start_timer(struct mpc52xx_gpt_priv *gpt, u64 period,
> extern u64 mpc52xx_gpt_timer_period(struct mpc52xx_gpt_priv *gpt);
> extern int mpc52xx_gpt_stop_timer(struct mpc52xx_gpt_priv *gpt);
>
> -/* mpc52xx_lpbfifo.c */
> -#define MPC52XX_LPBFIFO_FLAG_READ (0)
> -#define MPC52XX_LPBFIFO_FLAG_WRITE (1<<0)
> -#define MPC52XX_LPBFIFO_FLAG_NO_INCREMENT (1<<1)
> -#define MPC52XX_LPBFIFO_FLAG_NO_DMA (1<<2)
> -#define MPC52XX_LPBFIFO_FLAG_POLL_DMA (1<<3)
> -
> -struct mpc52xx_lpbfifo_request {
> - struct list_head list;
> -
> - /* localplus bus address */
> - unsigned int cs;
> - size_t offset;
> -
> - /* Memory address */
> - void *data;
> - phys_addr_t data_phys;
> -
> - /* Details of transfer */
> - size_t size;
> - size_t pos; /* current position of transfer */
> - int flags;
> - int defer_xfer_start;
> -
> - /* What to do when finished */
> - void (*callback)(struct mpc52xx_lpbfifo_request *);
> -
> - void *priv; /* Driver private data */
> -
> - /* statistics */
> - int irq_count;
> - int irq_ticks;
> - u8 last_byte;
> - int buffer_not_done_cnt;
> -};
> -
> -extern int mpc52xx_lpbfifo_submit(struct mpc52xx_lpbfifo_request *req);
> -extern void mpc52xx_lpbfifo_abort(struct mpc52xx_lpbfifo_request *req);
> -extern void mpc52xx_lpbfifo_poll(void);
> -extern int mpc52xx_lpbfifo_start_xfer(struct mpc52xx_lpbfifo_request *req);
> -
> /* mpc52xx_pic.c */
> extern void mpc52xx_init_irq(void);
> extern unsigned int mpc52xx_get_irq(void);
> diff --git a/arch/powerpc/platforms/52xx/mpc52xx_lpbfifo.c b/arch/powerpc/platforms/52xx/mpc52xx_lpbfifo.c
> index 6d1dd6e87478..32fd1345ffeb 100644
> --- a/arch/powerpc/platforms/52xx/mpc52xx_lpbfifo.c
> +++ b/arch/powerpc/platforms/52xx/mpc52xx_lpbfifo.c
> @@ -38,6 +38,39 @@ MODULE_LICENSE("GPL");
> #define LPBFIFO_REG_FIFO_CONTROL (0x48)
> #define LPBFIFO_REG_FIFO_ALARM (0x4C)
>
> +#define MPC52XX_LPBFIFO_FLAG_WRITE (1<<0)
> +#define MPC52XX_LPBFIFO_FLAG_NO_DMA (1<<2)
> +#define MPC52XX_LPBFIFO_FLAG_POLL_DMA (1<<3)
> +
> +struct mpc52xx_lpbfifo_request {
> + struct list_head list;
> +
> + /* localplus bus address */
> + unsigned int cs;
> + size_t offset;
> +
> + /* Memory address */
> + void *data;
> + phys_addr_t data_phys;
> +
> + /* Details of transfer */
> + size_t size;
> + size_t pos; /* current position of transfer */
> + int flags;
> + int defer_xfer_start;
> +
> + /* What to do when finished */
> + void (*callback)(struct mpc52xx_lpbfifo_request *);
> +
> + void *priv; /* Driver private data */
> +
> + /* statistics */
> + int irq_count;
> + int irq_ticks;
> + u8 last_byte;
> + int buffer_not_done_cnt;
> +};
> +
> struct mpc52xx_lpbfifo {
> struct device *dev;
> phys_addr_t regs_phys;
> @@ -381,107 +414,6 @@ static irqreturn_t mpc52xx_lpbfifo_bcom_irq(int irq, void *dev_id)
> return IRQ_HANDLED;
> }
>
> -/**
> - * mpc52xx_lpbfifo_poll - Poll for DMA completion
> - */
> -void mpc52xx_lpbfifo_poll(void)
> -{
> - struct mpc52xx_lpbfifo_request *req = lpbfifo.req;
> - int dma = !(req->flags & MPC52XX_LPBFIFO_FLAG_NO_DMA);
> - int write = req->flags & MPC52XX_LPBFIFO_FLAG_WRITE;
> -
> - /*
> - * For more information, see comments on the "Fat Lady"
> - */
> - if (dma && write)
> - mpc52xx_lpbfifo_irq(0, NULL);
> - else
> - mpc52xx_lpbfifo_bcom_irq(0, NULL);
> -}
> -EXPORT_SYMBOL(mpc52xx_lpbfifo_poll);
> -
> -/**
> - * mpc52xx_lpbfifo_submit - Submit an LPB FIFO transfer request.
> - * @req: Pointer to request structure
> - *
> - * Return: %0 on success, -errno code on error
> - */
> -int mpc52xx_lpbfifo_submit(struct mpc52xx_lpbfifo_request *req)
> -{
> - unsigned long flags;
> -
> - if (!lpbfifo.regs)
> - return -ENODEV;
> -
> - spin_lock_irqsave(&lpbfifo.lock, flags);
> -
> - /* If the req pointer is already set, then a transfer is in progress */
> - if (lpbfifo.req) {
> - spin_unlock_irqrestore(&lpbfifo.lock, flags);
> - return -EBUSY;
> - }
> -
> - /* Setup the transfer */
> - lpbfifo.req = req;
> - req->irq_count = 0;
> - req->irq_ticks = 0;
> - req->buffer_not_done_cnt = 0;
> - req->pos = 0;
> -
> - mpc52xx_lpbfifo_kick(req);
> - spin_unlock_irqrestore(&lpbfifo.lock, flags);
> - return 0;
> -}
> -EXPORT_SYMBOL(mpc52xx_lpbfifo_submit);
> -
> -int mpc52xx_lpbfifo_start_xfer(struct mpc52xx_lpbfifo_request *req)
> -{
> - unsigned long flags;
> -
> - if (!lpbfifo.regs)
> - return -ENODEV;
> -
> - spin_lock_irqsave(&lpbfifo.lock, flags);
> -
> - /*
> - * If the req pointer is already set and a transfer was
> - * started on submit, then this transfer is in progress
> - */
> - if (lpbfifo.req && !lpbfifo.req->defer_xfer_start) {
> - spin_unlock_irqrestore(&lpbfifo.lock, flags);
> - return -EBUSY;
> - }
> -
> - /*
> - * If the req was previously submitted but not
> - * started, start it now
> - */
> - if (lpbfifo.req && lpbfifo.req == req &&
> - lpbfifo.req->defer_xfer_start) {
> - out_8(lpbfifo.regs + LPBFIFO_REG_PACKET_SIZE, 0x01);
> - }
> -
> - spin_unlock_irqrestore(&lpbfifo.lock, flags);
> - return 0;
> -}
> -EXPORT_SYMBOL(mpc52xx_lpbfifo_start_xfer);
> -
> -void mpc52xx_lpbfifo_abort(struct mpc52xx_lpbfifo_request *req)
> -{
> - unsigned long flags;
> -
> - spin_lock_irqsave(&lpbfifo.lock, flags);
> - if (lpbfifo.req == req) {
> - /* Put it into reset and clear the state */
> - bcom_gen_bd_rx_reset(lpbfifo.bcom_rx_task);
> - bcom_gen_bd_tx_reset(lpbfifo.bcom_tx_task);
> - out_be32(lpbfifo.regs + LPBFIFO_REG_ENABLE, 0x01010000);
> - lpbfifo.req = NULL;
> - }
> - spin_unlock_irqrestore(&lpbfifo.lock, flags);
> -}
> -EXPORT_SYMBOL(mpc52xx_lpbfifo_abort);
> -
> static int mpc52xx_lpbfifo_probe(struct platform_device *op)
> {
> struct resource res;
> --
> 2.38.1
>
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | https://www.pengutronix.de/ |
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