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Message-Id: <20170804000023.15624-3-chris.packham@alliedtelesis.co.nz>
Date: Fri, 4 Aug 2017 12:00:18 +1200
From: Chris Packham <chris.packham@...iedtelesis.co.nz>
To: broonie@...nel.org, linux-spi@...r.kernel.org,
linux-kernel@...r.kernel.org, andy.shevchenko@...il.com,
hsweeten@...ionengravers.com
Cc: Chris Packham <chris.packham@...iedtelesis.co.nz>
Subject: [PATCH v2 2/7] spi: spi-ep93xx: use 32-bit read/write for all registers
From: H Hartley Sweeten <hsweeten@...ionengravers.com>
All the EP93xx SSP registers are 32-bit. Since most of the upper bits
are unused, this driver tries to be tricky and uses 8 or 16-bit I/O to
access the registers. This really just adds a bit of confusion.
Simplify the I/O by using 32-bit read/write's for all of the registers.
Signed-off-by: H Hartley Sweeten <hsweeten@...ionengravers.com>
[chris: use u32 instead of unsigned int]
Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
---
drivers/spi/spi-ep93xx.c | 83 ++++++++++++++++++++++--------------------------
1 file changed, 38 insertions(+), 45 deletions(-)
diff --git a/drivers/spi/spi-ep93xx.c b/drivers/spi/spi-ep93xx.c
index 49c42a6c2be1..0bd792020471 100644
--- a/drivers/spi/spi-ep93xx.c
+++ b/drivers/spi/spi-ep93xx.c
@@ -113,47 +113,47 @@ struct ep93xx_spi {
static int ep93xx_spi_enable(const struct ep93xx_spi *espi)
{
- u8 regval;
+ u32 val;
int err;
err = clk_enable(espi->clk);
if (err)
return err;
- regval = readb(espi->mmio + SSPCR1);
- regval |= SSPCR1_SSE;
- writeb(regval, espi->mmio + SSPCR1);
+ val = readl(espi->mmio + SSPCR1);
+ val |= SSPCR1_SSE;
+ writel(val, espi->mmio + SSPCR1);
return 0;
}
static void ep93xx_spi_disable(const struct ep93xx_spi *espi)
{
- u8 regval;
+ u32 val;
- regval = readb(espi->mmio + SSPCR1);
- regval &= ~SSPCR1_SSE;
- writeb(regval, espi->mmio + SSPCR1);
+ val = readl(espi->mmio + SSPCR1);
+ val &= ~SSPCR1_SSE;
+ writel(val, espi->mmio + SSPCR1);
clk_disable(espi->clk);
}
static void ep93xx_spi_enable_interrupts(const struct ep93xx_spi *espi)
{
- u8 regval;
+ u32 val;
- regval = readb(espi->mmio + SSPCR1);
- regval |= (SSPCR1_RORIE | SSPCR1_TIE | SSPCR1_RIE);
- writeb(regval, espi->mmio + SSPCR1);
+ val = readl(espi->mmio + SSPCR1);
+ val |= (SSPCR1_RORIE | SSPCR1_TIE | SSPCR1_RIE);
+ writel(val, espi->mmio + SSPCR1);
}
static void ep93xx_spi_disable_interrupts(const struct ep93xx_spi *espi)
{
- u8 regval;
+ u32 val;
- regval = readb(espi->mmio + SSPCR1);
- regval &= ~(SSPCR1_RORIE | SSPCR1_TIE | SSPCR1_RIE);
- writeb(regval, espi->mmio + SSPCR1);
+ val = readl(espi->mmio + SSPCR1);
+ val &= ~(SSPCR1_RORIE | SSPCR1_TIE | SSPCR1_RIE);
+ writel(val, espi->mmio + SSPCR1);
}
/**
@@ -230,47 +230,41 @@ static int ep93xx_spi_chip_setup(const struct ep93xx_spi *espi,
spi->mode, div_cpsr, div_scr, dss);
dev_dbg(&espi->pdev->dev, "setup: cr0 %#x\n", cr0);
- writeb(div_cpsr, espi->mmio + SSPCPSR);
- writew(cr0, espi->mmio + SSPCR0);
+ writel(div_cpsr, espi->mmio + SSPCPSR);
+ writel(cr0, espi->mmio + SSPCR0);
return 0;
}
static void ep93xx_do_write(struct ep93xx_spi *espi, struct spi_transfer *t)
{
- if (t->bits_per_word > 8) {
- u16 tx_val = 0;
+ u32 val = 0;
+ if (t->bits_per_word > 8) {
if (t->tx_buf)
- tx_val = ((u16 *)t->tx_buf)[espi->tx];
- writew(tx_val, espi->mmio + SSPDR);
- espi->tx += sizeof(tx_val);
+ val = ((u16 *)t->tx_buf)[espi->tx];
+ espi->tx += 2;
} else {
- u8 tx_val = 0;
-
if (t->tx_buf)
- tx_val = ((u8 *)t->tx_buf)[espi->tx];
- writeb(tx_val, espi->mmio + SSPDR);
- espi->tx += sizeof(tx_val);
+ val = ((u8 *)t->tx_buf)[espi->tx];
+ espi->tx += 1;
}
+ writel(val, espi->mmio + SSPDR);
}
static void ep93xx_do_read(struct ep93xx_spi *espi, struct spi_transfer *t)
{
- if (t->bits_per_word > 8) {
- u16 rx_val;
+ u32 val;
- rx_val = readw(espi->mmio + SSPDR);
+ val = readl(espi->mmio + SSPDR);
+ if (t->bits_per_word > 8) {
if (t->rx_buf)
- ((u16 *)t->rx_buf)[espi->rx] = rx_val;
- espi->rx += sizeof(rx_val);
+ ((u16 *)t->rx_buf)[espi->rx] = val;
+ espi->rx += 2;
} else {
- u8 rx_val;
-
- rx_val = readb(espi->mmio + SSPDR);
if (t->rx_buf)
- ((u8 *)t->rx_buf)[espi->rx] = rx_val;
- espi->rx += sizeof(rx_val);
+ ((u8 *)t->rx_buf)[espi->rx] = val;
+ espi->rx += 1;
}
}
@@ -291,7 +285,7 @@ static int ep93xx_spi_read_write(struct ep93xx_spi *espi)
struct spi_transfer *t = msg->state;
/* read as long as RX FIFO has frames in it */
- while ((readb(espi->mmio + SSPSR) & SSPSR_RNE)) {
+ while ((readl(espi->mmio + SSPSR) & SSPSR_RNE)) {
ep93xx_do_read(espi, t);
espi->fifo_level--;
}
@@ -593,14 +587,14 @@ static void ep93xx_spi_process_message(struct ep93xx_spi *espi,
* Just to be sure: flush any data from RX FIFO.
*/
timeout = jiffies + msecs_to_jiffies(SPI_TIMEOUT);
- while (readw(espi->mmio + SSPSR) & SSPSR_RNE) {
+ while (readl(espi->mmio + SSPSR) & SSPSR_RNE) {
if (time_after(jiffies, timeout)) {
dev_warn(&espi->pdev->dev,
"timeout while flushing RX FIFO\n");
msg->status = -ETIMEDOUT;
return;
}
- readw(espi->mmio + SSPDR);
+ readl(espi->mmio + SSPDR);
}
/*
@@ -649,15 +643,14 @@ static int ep93xx_spi_transfer_one_message(struct spi_master *master,
static irqreturn_t ep93xx_spi_interrupt(int irq, void *dev_id)
{
struct ep93xx_spi *espi = dev_id;
- u8 irq_status = readb(espi->mmio + SSPIIR);
/*
* If we got ROR (receive overrun) interrupt we know that something is
* wrong. Just abort the message.
*/
- if (unlikely(irq_status & SSPIIR_RORIS)) {
+ if (readl(espi->mmio + SSPIIR) & SSPIIR_RORIS) {
/* clear the overrun interrupt */
- writeb(0, espi->mmio + SSPICR);
+ writel(0, espi->mmio + SSPICR);
dev_warn(&espi->pdev->dev,
"receive overrun, aborting the message\n");
espi->current_msg->status = -EIO;
@@ -857,7 +850,7 @@ static int ep93xx_spi_probe(struct platform_device *pdev)
dev_warn(&pdev->dev, "DMA setup failed. Falling back to PIO\n");
/* make sure that the hardware is disabled */
- writeb(0, espi->mmio + SSPCR1);
+ writel(0, espi->mmio + SSPCR1);
error = devm_spi_register_master(&pdev->dev, master);
if (error) {
--
2.13.0
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