I attached it as as a standalone file. Does anyone have the new AsiaRF
module with support for the second chip select? Or any other hardware
that supports the second chip select? This code is a mechanical change
that just creates a path through the SPI code for passing the CS
number around.
This is how to use it in a DTS file
spi@b00 {
status = "okay";
m25p80@0 {
compatible = "mx25l6405d";
linux,modalias = "m25p80", "mx25l6405d";
reg = <0>;
spi-max-frequency = <10000000>;
};
codec: le89156@1 {
compatible = "zarlink,le89156";
reg = <1>;
spi-max-frequency = <10000000>;
};
};
That commit on git hub was generated with this procedure.
http://wiki.openwrt.org/doc/devel/patches
--
Jon Smirl
jonsm...@gmail.com
--- a/drivers/spi/spi-rt2880.c
+++ b/drivers/spi/spi-rt2880.c
@@ -27,16 +27,17 @@
#include <ralink_regs.h>
#define DRIVER_NAME "spi-rt2880"
-/* only one slave is supported*/
-#define RALINK_NUM_CHIPSELECTS 1
/* in usec */
#define RALINK_SPI_WAIT_MAX_LOOP 2000
-#define RAMIPS_SPI_STAT 0x00
-#define RAMIPS_SPI_CFG 0x10
-#define RAMIPS_SPI_CTL 0x14
-#define RAMIPS_SPI_DATA 0x20
-#define RAMIPS_SPI_FIFO_STAT 0x38
+#define RAMIPS_SPI_DEV_OFFSET 0x40
+
+#define RAMIPS_SPI_STAT(cs) (0x00 + (cs * RAMIPS_SPI_DEV_OFFSET))
+#define RAMIPS_SPI_CFG(cs) (0x10 + (cs * RAMIPS_SPI_DEV_OFFSET))
+#define RAMIPS_SPI_CTL(cs) (0x14 + (cs * RAMIPS_SPI_DEV_OFFSET))
+#define RAMIPS_SPI_DATA(cs) (0x20 + (cs * RAMIPS_SPI_DEV_OFFSET))
+#define RAMIPS_SPI_FIFO_STAT(cs) (0x38 + (cs * RAMIPS_SPI_DEV_OFFSET))
+#define RAMIPS_SPI_ARBITER 0xF0
/* SPISTAT register bit field */
#define SPISTAT_BUSY BIT(0)
@@ -66,6 +67,10 @@
/* SPIFIFOSTAT register bit field */
#define SPIFIFOSTAT_TXFULL BIT(17)
+#define SPICTL_ARB_EN BIT(31)
+#define SPI1_POR BIT(1)
+#define SPI0_POR BIT(0)
+
#define MT7621_SPI_TRANS 0x00
#define SPITRANS_BUSY BIT(16)
#define MT7621_SPI_OPCODE 0x04
@@ -80,9 +85,10 @@ struct rt2880_spi;
struct rt2880_spi_ops {
void (*init_hw)(struct rt2880_spi *rs);
- void (*set_cs)(struct rt2880_spi *rs, int enable);
+ void (*set_cs)(struct spi_device *spi, int enable);
int (*baudrate_set)(struct spi_device *spi, unsigned int speed);
unsigned int (*write_read)(struct spi_device *spi, struct list_head *list, struct spi_transfer *xfer);
+ int num_cs;
};
struct rt2880_spi {
@@ -139,6 +145,7 @@ static inline void rt2880_spi_clrbits(st
static int rt2880_spi_baudrate_set(struct spi_device *spi, unsigned int speed)
{
+ int cs = spi->chip_select;
struct rt2880_spi *rs = spidev_to_rt2880_spi(spi);
u32 rate;
u32 prescale;
@@ -166,9 +173,9 @@ static int rt2880_spi_baudrate_set(struc
prescale = ilog2(rate / 2);
dev_dbg(&spi->dev, "prescale:%u\n", prescale);
- reg = rt2880_spi_read(rs, RAMIPS_SPI_CFG);
+ reg = rt2880_spi_read(rs, RAMIPS_SPI_CFG(cs));
reg = ((reg & ~SPICFG_SPICLK_PRESCALE_MASK) | prescale);
- rt2880_spi_write(rs, RAMIPS_SPI_CFG, reg);
+ rt2880_spi_write(rs, RAMIPS_SPI_CFG(cs), reg);
rs->speed = speed;
return 0;
}
@@ -207,16 +214,20 @@ rt2880_spi_setup_transfer(struct spi_dev
return 0;
}
-static void rt2880_spi_set_cs(struct rt2880_spi *rs, int enable)
+static void rt2880_spi_set_cs(struct spi_device *spi, int enable)
{
+ struct rt2880_spi *rs = spidev_to_rt2880_spi(spi);
+ int cs = spi->chip_select;
+
if (enable)
- rt2880_spi_clrbits(rs, RAMIPS_SPI_CTL, SPICTL_SPIENA);
+ rt2880_spi_clrbits(rs, RAMIPS_SPI_CTL(cs), SPICTL_SPIENA);
else
- rt2880_spi_setbits(rs, RAMIPS_SPI_CTL, SPICTL_SPIENA);
+ rt2880_spi_setbits(rs, RAMIPS_SPI_CTL(cs), SPICTL_SPIENA);
}
-static void mt7621_spi_set_cs(struct rt2880_spi *rs, int enable)
+static void mt7621_spi_set_cs(struct spi_device *spi, int enable)
{
+ struct rt2880_spi *rs = spidev_to_rt2880_spi(spi);
u32 polar = rt2880_spi_read(rs, MT7621_SPI_POLAR);
if (enable)
@@ -226,14 +237,16 @@ static void mt7621_spi_set_cs(struct rt2
rt2880_spi_write(rs, MT7621_SPI_POLAR, polar);
}
-static inline int rt2880_spi_wait_till_ready(struct rt2880_spi *rs)
+static inline int rt2880_spi_wait_till_ready(struct spi_device *spi)
{
+ struct rt2880_spi *rs = spidev_to_rt2880_spi(spi);
+ int cs = spi->chip_select;
int i;
for (i = 0; i < RALINK_SPI_WAIT_MAX_LOOP; i++) {
u32 status;
- status = rt2880_spi_read(rs, RAMIPS_SPI_STAT);
+ status = rt2880_spi_read(rs, RAMIPS_SPI_STAT(cs));
if ((status & SPISTAT_BUSY) == 0)
return 0;
@@ -244,8 +257,9 @@ static inline int rt2880_spi_wait_till_r
return -ETIMEDOUT;
}
-static inline int mt7621_spi_wait_till_ready(struct rt2880_spi *rs)
+static inline int mt7621_spi_wait_till_ready(struct spi_device *spi)
{
+ struct rt2880_spi *rs = spidev_to_rt2880_spi(spi);
int i;
for (i = 0; i < RALINK_SPI_WAIT_MAX_LOOP; i++) {
@@ -266,6 +280,7 @@ static unsigned int
rt2880_spi_write_read(struct spi_device *spi, struct list_head *list, struct spi_transfer *xfer)
{
struct rt2880_spi *rs = spidev_to_rt2880_spi(spi);
+ int cs = spi->chip_select;
unsigned count = 0;
u8 *rx = xfer->rx_buf;
const u8 *tx = xfer->tx_buf;
@@ -277,9 +292,9 @@ rt2880_spi_write_read(struct spi_device
if (tx) {
for (count = 0; count < xfer->len; count++) {
- rt2880_spi_write(rs, RAMIPS_SPI_DATA, tx[count]);
- rt2880_spi_setbits(rs, RAMIPS_SPI_CTL, SPICTL_STARTWR);
- err = rt2880_spi_wait_till_ready(rs);
+ rt2880_spi_write(rs, RAMIPS_SPI_DATA(cs), tx[count]);
+ rt2880_spi_setbits(rs, RAMIPS_SPI_CTL(cs), SPICTL_STARTWR);
+ err = rt2880_spi_wait_till_ready(spi);
if (err) {
dev_err(&spi->dev, "TX failed, err=%d\n", err);
goto out;
@@ -289,13 +304,13 @@ rt2880_spi_write_read(struct spi_device
if (rx) {
for (count = 0; count < xfer->len; count++) {
- rt2880_spi_setbits(rs, RAMIPS_SPI_CTL, SPICTL_STARTRD);
- err = rt2880_spi_wait_till_ready(rs);
+ rt2880_spi_setbits(rs, RAMIPS_SPI_CTL(cs), SPICTL_STARTRD);
+ err = rt2880_spi_wait_till_ready(spi);
if (err) {
dev_err(&spi->dev, "RX failed, err=%d\n", err);
goto out;
}
- rx[count] = (u8) rt2880_spi_read(rs, RAMIPS_SPI_DATA);
+ rx[count] = (u8) rt2880_spi_read(rs, RAMIPS_SPI_DATA(cs));
}
}
@@ -362,7 +377,7 @@ mt7621_spi_write_read(struct spi_device
trans |= SPI_CTL_START;
rt2880_spi_write(rs, MT7621_SPI_TRANS, trans);
- mt7621_spi_wait_till_ready(rs);
+ mt7621_spi_wait_till_ready(spi);
if (rx) {
u32 data0 = rt2880_spi_read(rs, MT7621_SPI_DATA0);
@@ -438,7 +453,7 @@ static int rt2880_spi_transfer_one_messa
}
if (!cs_active) {
- rs->ops->set_cs(rs, 1);
+ rs->ops->set_cs(spi, 1);
cs_active = 1;
}
@@ -449,14 +464,14 @@ static int rt2880_spi_transfer_one_messa
udelay(t->delay_usecs);
if (t->cs_change) {
- rs->ops->set_cs(rs, 0);
+ rs->ops->set_cs(spi, 0);
cs_active = 0;
}
}
msg_done:
if (cs_active)
- rs->ops->set_cs(rs, 0);
+ rs->ops->set_cs(spi, 0);
m->status = status;
spi_finalize_current_message(master);
@@ -486,10 +501,25 @@ static int rt2880_spi_setup(struct spi_d
static void rt2880_spi_reset(struct rt2880_spi *rs)
{
- rt2880_spi_write(rs, RAMIPS_SPI_CFG,
+ rt2880_spi_write(rs, RAMIPS_SPI_CFG(0),
SPICFG_MSBFIRST | SPICFG_TXCLKEDGE_FALLING |
SPICFG_SPICLK_DIV16 | SPICFG_SPICLKPOL);
- rt2880_spi_write(rs, RAMIPS_SPI_CTL, SPICTL_HIZSDO | SPICTL_SPIENA);
+ rt2880_spi_write(rs, RAMIPS_SPI_CTL(0), SPICTL_HIZSDO | SPICTL_SPIENA);
+}
+
+static void rt5350_spi_reset(struct rt2880_spi *rs)
+{
+ int cs;
+
+ rt2880_spi_write(rs, RAMIPS_SPI_ARBITER,
+ SPICTL_ARB_EN | SPI1_POR | SPI0_POR);
+
+ for (cs = 0; cs < rs->ops->num_cs; cs++) {
+ rt2880_spi_write(rs, RAMIPS_SPI_CFG(cs),
+ SPICFG_MSBFIRST | SPICFG_TXCLKEDGE_FALLING |
+ SPICFG_SPICLK_DIV16 | SPICFG_SPICLKPOL);
+ rt2880_spi_write(rs, RAMIPS_SPI_CTL(cs), SPICTL_HIZSDO | SPICTL_SPIENA);
+ }
}
static void mt7621_spi_reset(struct rt2880_spi *rs)
@@ -509,17 +539,26 @@ static struct rt2880_spi_ops spi_ops[] =
.set_cs = rt2880_spi_set_cs,
.baudrate_set = rt2880_spi_baudrate_set,
.write_read = rt2880_spi_write_read,
+ .num_cs = 1,
+ }, {
+ .init_hw = rt5350_spi_reset,
+ .set_cs = rt2880_spi_set_cs,
+ .baudrate_set = rt2880_spi_baudrate_set,
+ .write_read = rt2880_spi_write_read,
+ .num_cs = 2,
}, {
.init_hw = mt7621_spi_reset,
.set_cs = mt7621_spi_set_cs,
.baudrate_set = mt7621_spi_baudrate_set,
.write_read = mt7621_spi_write_read,
+ .num_cs = 1,
},
};
static const struct of_device_id rt2880_spi_match[] = {
{ .compatible = "ralink,rt2880-spi", .data = &spi_ops[0]},
- { .compatible = "ralink,mt7621-spi", .data = &spi_ops[1] },
+ { .compatible = "ralink,rt5350-spi", .data = &spi_ops[1]},
+ { .compatible = "ralink,mt7621-spi", .data = &spi_ops[2] },
{},
};
MODULE_DEVICE_TABLE(of, rt2880_spi_match);
@@ -534,10 +573,12 @@ static int rt2880_spi_probe(struct platf
struct resource *r;
int status = 0;
struct clk *clk;
+ struct rt2880_spi_ops *ops;
match = of_match_device(rt2880_spi_match, &pdev->dev);
if (!match)
return -EINVAL;
+ ops = (struct rt2880_spi_ops *)match->data;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, r);
@@ -566,9 +607,9 @@ static int rt2880_spi_probe(struct platf
master->setup = rt2880_spi_setup;
master->transfer_one_message = rt2880_spi_transfer_one_message;
- master->num_chipselect = RALINK_NUM_CHIPSELECTS;
master->bits_per_word_mask = SPI_BPW_MASK(8);
master->dev.of_node = pdev->dev.of_node;
+ master->num_chipselect = ops->num_cs;
dev_set_drvdata(&pdev->dev, master);
@@ -577,7 +618,7 @@ static int rt2880_spi_probe(struct platf
rs->clk = clk;
rs->master = master;
rs->sys_freq = clk_get_rate(rs->clk);
- rs->ops = (struct rt2880_spi_ops *) match->data;
+ rs->ops = ops;
dev_dbg(&pdev->dev, "sys_freq: %u\n", rs->sys_freq);
spin_lock_irqsave(&rs->lock, flags);
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