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Date: Tue, 20 Sep 2011 14:50:00 -0600
From: Grant Likely <grant.likely@...retlab.ca>
To: H Hartley Sweeten <hartleys@...ionengravers.com>
Cc: Linux Kernel <linux-kernel@...r.kernel.org>,
spi-devel-general@...ts.sourceforge.net,
Feng Tang <feng.tang@...el.com>
Subject: Re: [PATCH] spi: spi-dw: fix all sparse warnings
On Tue, Sep 20, 2011 at 11:06:17AM -0700, H Hartley Sweeten wrote:
> The dw_{read,write}[lw] macros produce sparse warnings everytime they
> are used. The "read" ones cause:
>
> warning: cast removes address space of expression
> warning: incorrect type in argument 1 (different address spaces)
> expected void const volatile [noderef] <asn:2>*addr
> got unsigned int *<noident>
>
> And the "write" ones:
>
> warning: cast removes address space of expression
> warning: incorrect type in argument 2 (different address spaces)
> expected void volatile [noderef] <asn:2>*addr
> got unsigned int *<noident>
>
> Fix this by removing struct dw_spi_reg and converting all the register
> offsets to #defines. Then convert the macros into inlined functions so
> that proper type checking can occur.
>
> While here, also fix the three sparse warnings in spi-dw-mid.c due to
> the return value of ioremap_nocache being stored in a u32 * not a
> void __iomem *.
>
> With these changes the spi-dw* files all build with no sparse warnings.
>
> Signed-off-by: H Hartley Sweeten <hsweeten@...ionengravers.com>
> Cc: Grant Likely <grant.likely@...retlab.ca>
Looks good to me. Feng, does this look okay to you?
g.
>
> ---
>
> diff --git a/drivers/spi/spi-dw-mid.c b/drivers/spi/spi-dw-mid.c
> index 130e555..e743a45 100644
> --- a/drivers/spi/spi-dw-mid.c
> +++ b/drivers/spi/spi-dw-mid.c
> @@ -116,13 +116,13 @@ static int mid_spi_dma_transfer(struct dw_spi *dws, int cs_change)
> /* 1. setup DMA related registers */
> if (cs_change) {
> spi_enable_chip(dws, 0);
> - dw_writew(dws, dmardlr, 0xf);
> - dw_writew(dws, dmatdlr, 0x10);
> + dw_writew(dws, DW_SPI_DMARDLR, 0xf);
> + dw_writew(dws, DW_SPI_DMATDLR, 0x10);
> if (dws->tx_dma)
> dma_ctrl |= 0x2;
> if (dws->rx_dma)
> dma_ctrl |= 0x1;
> - dw_writew(dws, dmacr, dma_ctrl);
> + dw_writew(dws, DW_SPI_DMACR, dma_ctrl);
> spi_enable_chip(dws, 1);
> }
>
> @@ -200,7 +200,8 @@ static struct dw_spi_dma_ops mid_dma_ops = {
>
> int dw_spi_mid_init(struct dw_spi *dws)
> {
> - u32 *clk_reg, clk_cdiv;
> + void __iomem *clk_reg;
> + u32 clk_cdiv;
>
> clk_reg = ioremap_nocache(MRST_CLK_SPI0_REG, 16);
> if (!clk_reg)
> diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
> index 0b99320..082458d 100644
> --- a/drivers/spi/spi-dw.c
> +++ b/drivers/spi/spi-dw.c
> @@ -89,35 +89,35 @@ static ssize_t spi_show_regs(struct file *file, char __user *user_buf,
> len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
> "=================================\n");
> len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
> - "CTRL0: \t\t0x%08x\n", dw_readl(dws, ctrl0));
> + "CTRL0: \t\t0x%08x\n", dw_readl(dws, DW_SPI_CTRL0));
> len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
> - "CTRL1: \t\t0x%08x\n", dw_readl(dws, ctrl1));
> + "CTRL1: \t\t0x%08x\n", dw_readl(dws, DW_SPI_CTRL1));
> len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
> - "SSIENR: \t0x%08x\n", dw_readl(dws, ssienr));
> + "SSIENR: \t0x%08x\n", dw_readl(dws, DW_SPI_SSIENR));
> len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
> - "SER: \t\t0x%08x\n", dw_readl(dws, ser));
> + "SER: \t\t0x%08x\n", dw_readl(dws, DW_SPI_SER));
> len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
> - "BAUDR: \t\t0x%08x\n", dw_readl(dws, baudr));
> + "BAUDR: \t\t0x%08x\n", dw_readl(dws, DW_SPI_BAUDR));
> len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
> - "TXFTLR: \t0x%08x\n", dw_readl(dws, txfltr));
> + "TXFTLR: \t0x%08x\n", dw_readl(dws, DW_SPI_TXFLTR));
> len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
> - "RXFTLR: \t0x%08x\n", dw_readl(dws, rxfltr));
> + "RXFTLR: \t0x%08x\n", dw_readl(dws, DW_SPI_RXFLTR));
> len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
> - "TXFLR: \t\t0x%08x\n", dw_readl(dws, txflr));
> + "TXFLR: \t\t0x%08x\n", dw_readl(dws, DW_SPI_TXFLR));
> len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
> - "RXFLR: \t\t0x%08x\n", dw_readl(dws, rxflr));
> + "RXFLR: \t\t0x%08x\n", dw_readl(dws, DW_SPI_RXFLR));
> len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
> - "SR: \t\t0x%08x\n", dw_readl(dws, sr));
> + "SR: \t\t0x%08x\n", dw_readl(dws, DW_SPI_SR));
> len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
> - "IMR: \t\t0x%08x\n", dw_readl(dws, imr));
> + "IMR: \t\t0x%08x\n", dw_readl(dws, DW_SPI_IMR));
> len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
> - "ISR: \t\t0x%08x\n", dw_readl(dws, isr));
> + "ISR: \t\t0x%08x\n", dw_readl(dws, DW_SPI_ISR));
> len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
> - "DMACR: \t\t0x%08x\n", dw_readl(dws, dmacr));
> + "DMACR: \t\t0x%08x\n", dw_readl(dws, DW_SPI_DMACR));
> len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
> - "DMATDLR: \t0x%08x\n", dw_readl(dws, dmatdlr));
> + "DMATDLR: \t0x%08x\n", dw_readl(dws, DW_SPI_DMATDLR));
> len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
> - "DMARDLR: \t0x%08x\n", dw_readl(dws, dmardlr));
> + "DMARDLR: \t0x%08x\n", dw_readl(dws, DW_SPI_DMARDLR));
> len += snprintf(buf + len, SPI_REGS_BUFSIZE - len,
> "=================================\n");
>
> @@ -167,7 +167,7 @@ static inline u32 tx_max(struct dw_spi *dws)
> u32 tx_left, tx_room, rxtx_gap;
>
> tx_left = (dws->tx_end - dws->tx) / dws->n_bytes;
> - tx_room = dws->fifo_len - dw_readw(dws, txflr);
> + tx_room = dws->fifo_len - dw_readw(dws, DW_SPI_TXFLR);
>
> /*
> * Another concern is about the tx/rx mismatch, we
> @@ -188,7 +188,7 @@ static inline u32 rx_max(struct dw_spi *dws)
> {
> u32 rx_left = (dws->rx_end - dws->rx) / dws->n_bytes;
>
> - return min(rx_left, (u32)dw_readw(dws, rxflr));
> + return min(rx_left, (u32)dw_readw(dws, DW_SPI_RXFLR));
> }
>
> static void dw_writer(struct dw_spi *dws)
> @@ -204,7 +204,7 @@ static void dw_writer(struct dw_spi *dws)
> else
> txw = *(u16 *)(dws->tx);
> }
> - dw_writew(dws, dr, txw);
> + dw_writew(dws, DW_SPI_DR, txw);
> dws->tx += dws->n_bytes;
> }
> }
> @@ -215,7 +215,7 @@ static void dw_reader(struct dw_spi *dws)
> u16 rxw;
>
> while (max--) {
> - rxw = dw_readw(dws, dr);
> + rxw = dw_readw(dws, DW_SPI_DR);
> /* Care rx only if the transfer's original "rx" is not null */
> if (dws->rx_end - dws->len) {
> if (dws->n_bytes == 1)
> @@ -323,13 +323,13 @@ EXPORT_SYMBOL_GPL(dw_spi_xfer_done);
>
> static irqreturn_t interrupt_transfer(struct dw_spi *dws)
> {
> - u16 irq_status = dw_readw(dws, isr);
> + u16 irq_status = dw_readw(dws, DW_SPI_ISR);
>
> /* Error handling */
> if (irq_status & (SPI_INT_TXOI | SPI_INT_RXOI | SPI_INT_RXUI)) {
> - dw_readw(dws, txoicr);
> - dw_readw(dws, rxoicr);
> - dw_readw(dws, rxuicr);
> + dw_readw(dws, DW_SPI_TXOICR);
> + dw_readw(dws, DW_SPI_RXOICR);
> + dw_readw(dws, DW_SPI_RXUICR);
> int_error_stop(dws, "interrupt_transfer: fifo overrun/underrun");
> return IRQ_HANDLED;
> }
> @@ -353,7 +353,7 @@ static irqreturn_t interrupt_transfer(struct dw_spi *dws)
> static irqreturn_t dw_spi_irq(int irq, void *dev_id)
> {
> struct dw_spi *dws = dev_id;
> - u16 irq_status = dw_readw(dws, isr) & 0x3f;
> + u16 irq_status = dw_readw(dws, DW_SPI_ISR) & 0x3f;
>
> if (!irq_status)
> return IRQ_NONE;
> @@ -521,11 +521,11 @@ static void pump_transfers(unsigned long data)
> * 2. clk_div is changed
> * 3. control value changes
> */
> - if (dw_readw(dws, ctrl0) != cr0 || cs_change || clk_div || imask) {
> + if (dw_readw(dws, DW_SPI_CTRL0) != cr0 || cs_change || clk_div || imask) {
> spi_enable_chip(dws, 0);
>
> - if (dw_readw(dws, ctrl0) != cr0)
> - dw_writew(dws, ctrl0, cr0);
> + if (dw_readw(dws, DW_SPI_CTRL0) != cr0)
> + dw_writew(dws, DW_SPI_CTRL0, cr0);
>
> spi_set_clk(dws, clk_div ? clk_div : chip->clk_div);
> spi_chip_sel(dws, spi->chip_select);
> @@ -535,7 +535,7 @@ static void pump_transfers(unsigned long data)
> if (imask)
> spi_umask_intr(dws, imask);
> if (txint_level)
> - dw_writew(dws, txfltr, txint_level);
> + dw_writew(dws, DW_SPI_TXFLTR, txint_level);
>
> spi_enable_chip(dws, 1);
> if (cs_change)
> @@ -791,13 +791,13 @@ static void spi_hw_init(struct dw_spi *dws)
> if (!dws->fifo_len) {
> u32 fifo;
> for (fifo = 2; fifo <= 257; fifo++) {
> - dw_writew(dws, txfltr, fifo);
> - if (fifo != dw_readw(dws, txfltr))
> + dw_writew(dws, DW_SPI_TXFLTR, fifo);
> + if (fifo != dw_readw(dws, DW_SPI_TXFLTR))
> break;
> }
>
> dws->fifo_len = (fifo == 257) ? 0 : fifo;
> - dw_writew(dws, txfltr, 0);
> + dw_writew(dws, DW_SPI_TXFLTR, 0);
> }
> }
>
> diff --git a/drivers/spi/spi-dw.h b/drivers/spi/spi-dw.h
> index 8b7b07b..9c57c07 100644
> --- a/drivers/spi/spi-dw.h
> +++ b/drivers/spi/spi-dw.h
> @@ -4,6 +4,33 @@
> #include <linux/io.h>
> #include <linux/scatterlist.h>
>
> +/* Register offsets */
> +#define DW_SPI_CTRL0 0x00
> +#define DW_SPI_CTRL1 0x04
> +#define DW_SPI_SSIENR 0x08
> +#define DW_SPI_MWCR 0x0c
> +#define DW_SPI_SER 0x10
> +#define DW_SPI_BAUDR 0x14
> +#define DW_SPI_TXFLTR 0x18
> +#define DW_SPI_RXFLTR 0x1c
> +#define DW_SPI_TXFLR 0x20
> +#define DW_SPI_RXFLR 0x24
> +#define DW_SPI_SR 0x28
> +#define DW_SPI_IMR 0x2c
> +#define DW_SPI_ISR 0x30
> +#define DW_SPI_RISR 0x34
> +#define DW_SPI_TXOICR 0x38
> +#define DW_SPI_RXOICR 0x3c
> +#define DW_SPI_RXUICR 0x40
> +#define DW_SPI_MSTICR 0x44
> +#define DW_SPI_ICR 0x48
> +#define DW_SPI_DMACR 0x4c
> +#define DW_SPI_DMATDLR 0x50
> +#define DW_SPI_DMARDLR 0x54
> +#define DW_SPI_IDR 0x58
> +#define DW_SPI_VERSION 0x5c
> +#define DW_SPI_DR 0x60
> +
> /* Bit fields in CTRLR0 */
> #define SPI_DFS_OFFSET 0
>
> @@ -55,35 +82,6 @@ enum dw_ssi_type {
> SSI_NS_MICROWIRE,
> };
>
> -struct dw_spi_reg {
> - u32 ctrl0;
> - u32 ctrl1;
> - u32 ssienr;
> - u32 mwcr;
> - u32 ser;
> - u32 baudr;
> - u32 txfltr;
> - u32 rxfltr;
> - u32 txflr;
> - u32 rxflr;
> - u32 sr;
> - u32 imr;
> - u32 isr;
> - u32 risr;
> - u32 txoicr;
> - u32 rxoicr;
> - u32 rxuicr;
> - u32 msticr;
> - u32 icr;
> - u32 dmacr;
> - u32 dmatdlr;
> - u32 dmardlr;
> - u32 idr;
> - u32 version;
> - u32 dr; /* Currently oper as 32 bits,
> - though only low 16 bits matters */
> -} __packed;
> -
> struct dw_spi;
> struct dw_spi_dma_ops {
> int (*dma_init)(struct dw_spi *dws);
> @@ -161,23 +159,34 @@ struct dw_spi {
> #endif
> };
>
> -#define dw_readl(dw, name) \
> - __raw_readl(&(((struct dw_spi_reg *)dw->regs)->name))
> -#define dw_writel(dw, name, val) \
> - __raw_writel((val), &(((struct dw_spi_reg *)dw->regs)->name))
> -#define dw_readw(dw, name) \
> - __raw_readw(&(((struct dw_spi_reg *)dw->regs)->name))
> -#define dw_writew(dw, name, val) \
> - __raw_writew((val), &(((struct dw_spi_reg *)dw->regs)->name))
> +static inline u32 dw_readl(struct dw_spi *dws, u32 offset)
> +{
> + return __raw_readl(dws->regs + offset);
> +}
> +
> +static inline void dw_writel(struct dw_spi *dws, u32 offset, u32 val)
> +{
> + __raw_writel(val, dws->regs + offset);
> +}
> +
> +static inline u16 dw_readw(struct dw_spi *dws, u32 offset)
> +{
> + return __raw_readw(dws->regs + offset);
> +}
> +
> +static inline void dw_writew(struct dw_spi *dws, u32 offset, u16 val)
> +{
> + __raw_writew(val, dws->regs + offset);
> +}
>
> static inline void spi_enable_chip(struct dw_spi *dws, int enable)
> {
> - dw_writel(dws, ssienr, (enable ? 1 : 0));
> + dw_writel(dws, DW_SPI_SSIENR, (enable ? 1 : 0));
> }
>
> static inline void spi_set_clk(struct dw_spi *dws, u16 div)
> {
> - dw_writel(dws, baudr, div);
> + dw_writel(dws, DW_SPI_BAUDR, div);
> }
>
> static inline void spi_chip_sel(struct dw_spi *dws, u16 cs)
> @@ -188,7 +197,7 @@ static inline void spi_chip_sel(struct dw_spi *dws, u16 cs)
> if (dws->cs_control)
> dws->cs_control(1);
>
> - dw_writel(dws, ser, 1 << cs);
> + dw_writel(dws, DW_SPI_SER, 1 << cs);
> }
>
> /* Disable IRQ bits */
> @@ -196,8 +205,8 @@ static inline void spi_mask_intr(struct dw_spi *dws, u32 mask)
> {
> u32 new_mask;
>
> - new_mask = dw_readl(dws, imr) & ~mask;
> - dw_writel(dws, imr, new_mask);
> + new_mask = dw_readl(dws, DW_SPI_IMR) & ~mask;
> + dw_writel(dws, DW_SPI_IMR, new_mask);
> }
>
> /* Enable IRQ bits */
> @@ -205,8 +214,8 @@ static inline void spi_umask_intr(struct dw_spi *dws, u32 mask)
> {
> u32 new_mask;
>
> - new_mask = dw_readl(dws, imr) | mask;
> - dw_writel(dws, imr, new_mask);
> + new_mask = dw_readl(dws, DW_SPI_IMR) | mask;
> + dw_writel(dws, DW_SPI_IMR, new_mask);
> }
>
> /*
--
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