#include <malloc.h>
#include <spi.h>
+#ifndef CONFIG_ALTERA_SPI_IDLE_VAL
+#define CONFIG_ALTERA_SPI_IDLE_VAL 0xff
+#endif
+
+#ifndef CONFIG_SYS_ALTERA_SPI_LIST
+#define CONFIG_SYS_ALTERA_SPI_LIST { CONFIG_SYS_SPI_BASE }
+#endif
+
struct altera_spi_regs {
u32 rxdata;
u32 txdata;
u32 slave_sel;
};
-#define ALTERA_SPI_STATUS_ROE_MSK (0x8)
-#define ALTERA_SPI_STATUS_TOE_MSK (0x10)
-#define ALTERA_SPI_STATUS_TMT_MSK (0x20)
-#define ALTERA_SPI_STATUS_TRDY_MSK (0x40)
-#define ALTERA_SPI_STATUS_RRDY_MSK (0x80)
-#define ALTERA_SPI_STATUS_E_MSK (0x100)
+#define ALTERA_SPI_STATUS_ROE_MSK (1 << 3)
+#define ALTERA_SPI_STATUS_TOE_MSK (1 << 4)
+#define ALTERA_SPI_STATUS_TMT_MSK (1 << 5)
+#define ALTERA_SPI_STATUS_TRDY_MSK (1 << 6)
+#define ALTERA_SPI_STATUS_RRDY_MSK (1 << 7)
+#define ALTERA_SPI_STATUS_E_MSK (1 << 8)
-#define ALTERA_SPI_CONTROL_IROE_MSK (0x8)
-#define ALTERA_SPI_CONTROL_ITOE_MSK (0x10)
-#define ALTERA_SPI_CONTROL_ITRDY_MSK (0x40)
-#define ALTERA_SPI_CONTROL_IRRDY_MSK (0x80)
-#define ALTERA_SPI_CONTROL_IE_MSK (0x100)
-#define ALTERA_SPI_CONTROL_SSO_MSK (0x400)
-
-#ifndef CONFIG_SYS_ALTERA_SPI_LIST
-#define CONFIG_SYS_ALTERA_SPI_LIST { CONFIG_SYS_SPI_BASE }
-#endif
+#define ALTERA_SPI_CONTROL_IROE_MSK (1 << 3)
+#define ALTERA_SPI_CONTROL_ITOE_MSK (1 << 4)
+#define ALTERA_SPI_CONTROL_ITRDY_MSK (1 << 6)
+#define ALTERA_SPI_CONTROL_IRRDY_MSK (1 << 7)
+#define ALTERA_SPI_CONTROL_IE_MSK (1 << 8)
+#define ALTERA_SPI_CONTROL_SSO_MSK (1 << 10)
static ulong altera_spi_base_list[] = CONFIG_SYS_ALTERA_SPI_LIST;
};
#define to_altera_spi_slave(s) container_of(s, struct altera_spi_slave, slave)
-__attribute__((weak))
-int spi_cs_is_valid(unsigned int bus, unsigned int cs)
+__weak int spi_cs_is_valid(unsigned int bus, unsigned int cs)
{
return bus < ARRAY_SIZE(altera_spi_base_list) && cs < 32;
}
-__attribute__((weak))
-void spi_cs_activate(struct spi_slave *slave)
+__weak void spi_cs_activate(struct spi_slave *slave)
{
struct altera_spi_slave *altspi = to_altera_spi_slave(slave);
writel(1 << slave->cs, &altspi->regs->slave_sel);
writel(ALTERA_SPI_CONTROL_SSO_MSK, &altspi->regs->control);
}
-__attribute__((weak))
-void spi_cs_deactivate(struct spi_slave *slave)
+__weak void spi_cs_deactivate(struct spi_slave *slave)
{
struct altera_spi_slave *altspi = to_altera_spi_slave(slave);
writel(0, &altspi->regs->control);
return NULL;
altspi->regs = (struct altera_spi_regs *)altera_spi_base_list[bus];
- debug("%s: bus:%i cs:%i base:%p\n", __func__,
- bus, cs, altspi->regs);
+ debug("%s: bus:%i cs:%i base:%p\n", __func__, bus, cs, altspi->regs);
return &altspi->slave;
}
writel(0, &altspi->regs->slave_sel);
}
-#ifndef CONFIG_ALTERA_SPI_IDLE_VAL
-# define CONFIG_ALTERA_SPI_IDLE_VAL 0xff
-#endif
-
int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
void *din, unsigned long flags)
{
struct altera_spi_slave *altspi = to_altera_spi_slave(slave);
/* assume spi core configured to do 8 bit transfers */
- uint bytes = bitlen / 8;
- const uchar *txp = dout;
- uchar *rxp = din;
+ unsigned int bytes = bitlen / 8;
+ const unsigned char *txp = dout;
+ unsigned char *rxp = din;
+ uint32_t reg, data, start;
debug("%s: bus:%i cs:%i bitlen:%i bytes:%i flags:%lx\n", __func__,
- slave->bus, slave->cs, bitlen, bytes, flags);
+ slave->bus, slave->cs, bitlen, bytes, flags);
+
if (bitlen == 0)
goto done;
/* empty read buffer */
if (readl(&altspi->regs->status) & ALTERA_SPI_STATUS_RRDY_MSK)
readl(&altspi->regs->rxdata);
+
if (flags & SPI_XFER_BEGIN)
spi_cs_activate(slave);
while (bytes--) {
- uchar d = txp ? *txp++ : CONFIG_ALTERA_SPI_IDLE_VAL;
- debug("%s: tx:%x ", __func__, d);
- writel(d, &altspi->regs->txdata);
- while (!(readl(&altspi->regs->status) & ALTERA_SPI_STATUS_RRDY_MSK))
- ;
- d = readl(&altspi->regs->rxdata);
+ if (txp)
+ data = *txp++;
+ else
+ data = CONFIG_ALTERA_SPI_IDLE_VAL;
+
+ debug("%s: tx:%x ", __func__, data);
+ writel(data, &altspi->regs->txdata);
+
+ start = get_timer(0);
+ while (1) {
+ reg = readl(&altspi->regs->status);
+ if (reg & ALTERA_SPI_STATUS_RRDY_MSK)
+ break;
+ if (get_timer(start) > (CONFIG_SYS_HZ / 1000)) {
+ printf("%s: Transmission timed out!\n", __func__);
+ goto done;
+ }
+ }
+
+ data = readl(&altspi->regs->rxdata);
if (rxp)
- *rxp++ = d;
- debug("rx:%x\n", d);
+ *rxp++ = data & 0xff;
+
+ debug("rx:%x\n", data);
}
- done:
+
+done:
if (flags & SPI_XFER_END)
spi_cs_deactivate(slave);