+// SPDX-License-Identifier: GPL-2.0+
/*
* Altera SPI driver
*
* based on bfin_spi.c
* Copyright (c) 2005-2008 Analog Devices Inc.
- *
- * Licensed under the GPL-2 or later.
*/
#include <common.h>
-#include <asm/io.h>
+#include <dm.h>
+#include <errno.h>
+#include <log.h>
#include <malloc.h>
+#include <fdtdec.h>
#include <spi.h>
+#include <asm/io.h>
+#include <linux/bitops.h>
+
+#define ALTERA_SPI_STATUS_RRDY_MSK BIT(7)
+#define ALTERA_SPI_CONTROL_SSO_MSK BIT(10)
-#define ALTERA_SPI_RXDATA 0
-#define ALTERA_SPI_TXDATA 4
-#define ALTERA_SPI_STATUS 8
-#define ALTERA_SPI_CONTROL 12
-#define ALTERA_SPI_SLAVE_SEL 20
-
-#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_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 }
+#ifndef CONFIG_ALTERA_SPI_IDLE_VAL
+#define CONFIG_ALTERA_SPI_IDLE_VAL 0xff
#endif
-static ulong altera_spi_base_list[] = CONFIG_SYS_ALTERA_SPI_LIST;
+struct altera_spi_regs {
+ u32 rxdata;
+ u32 txdata;
+ u32 status;
+ u32 control;
+ u32 _reserved;
+ u32 slave_sel;
+};
-struct altera_spi_slave {
- struct spi_slave slave;
- ulong base;
+struct altera_spi_platdata {
+ struct altera_spi_regs *regs;
};
-#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)
-{
- return bus < ARRAY_SIZE(altera_spi_base_list) && cs < 32;
-}
+struct altera_spi_priv {
+ struct altera_spi_regs *regs;
+};
-__attribute__((weak))
-void spi_cs_activate(struct spi_slave *slave)
+static void spi_cs_activate(struct udevice *dev, uint cs)
{
- struct altera_spi_slave *altspi = to_altera_spi_slave(slave);
- writel(1 << slave->cs, altspi->base + ALTERA_SPI_SLAVE_SEL);
- writel(ALTERA_SPI_CONTROL_SSO_MSK, altspi->base + ALTERA_SPI_CONTROL);
-}
+ struct udevice *bus = dev->parent;
+ struct altera_spi_priv *priv = dev_get_priv(bus);
+ struct altera_spi_regs *const regs = priv->regs;
-__attribute__((weak))
-void spi_cs_deactivate(struct spi_slave *slave)
-{
- struct altera_spi_slave *altspi = to_altera_spi_slave(slave);
- writel(0, altspi->base + ALTERA_SPI_CONTROL);
- writel(0, altspi->base + ALTERA_SPI_SLAVE_SEL);
+ writel(1 << cs, ®s->slave_sel);
+ writel(ALTERA_SPI_CONTROL_SSO_MSK, ®s->control);
}
-void spi_init(void)
+static void spi_cs_deactivate(struct udevice *dev)
{
+ struct udevice *bus = dev->parent;
+ struct altera_spi_priv *priv = dev_get_priv(bus);
+ struct altera_spi_regs *const regs = priv->regs;
+
+ writel(0, ®s->control);
+ writel(0, ®s->slave_sel);
}
-struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
- unsigned int max_hz, unsigned int mode)
+static int altera_spi_claim_bus(struct udevice *dev)
{
- struct altera_spi_slave *altspi;
-
- if (!spi_cs_is_valid(bus, cs))
- return NULL;
-
- altspi = malloc(sizeof(*altspi));
- if (!altspi)
- return NULL;
+ struct udevice *bus = dev->parent;
+ struct altera_spi_priv *priv = dev_get_priv(bus);
+ struct altera_spi_regs *const regs = priv->regs;
- altspi->slave.bus = bus;
- altspi->slave.cs = cs;
- altspi->base = altera_spi_base_list[bus];
- debug("%s: bus:%i cs:%i base:%lx\n", __func__,
- bus, cs, altspi->base);
+ writel(0, ®s->control);
+ writel(0, ®s->slave_sel);
- return &altspi->slave;
+ return 0;
}
-void spi_free_slave(struct spi_slave *slave)
+static int altera_spi_release_bus(struct udevice *dev)
{
- struct altera_spi_slave *altspi = to_altera_spi_slave(slave);
- free(altspi);
-}
+ struct udevice *bus = dev->parent;
+ struct altera_spi_priv *priv = dev_get_priv(bus);
+ struct altera_spi_regs *const regs = priv->regs;
-int spi_claim_bus(struct spi_slave *slave)
-{
- struct altera_spi_slave *altspi = to_altera_spi_slave(slave);
+ writel(0, ®s->slave_sel);
- debug("%s: bus:%i cs:%i\n", __func__, slave->bus, slave->cs);
- writel(0, altspi->base + ALTERA_SPI_CONTROL);
- writel(0, altspi->base + ALTERA_SPI_SLAVE_SEL);
return 0;
}
-void spi_release_bus(struct spi_slave *slave)
+static int altera_spi_xfer(struct udevice *dev, unsigned int bitlen,
+ const void *dout, void *din, unsigned long flags)
{
- struct altera_spi_slave *altspi = to_altera_spi_slave(slave);
+ struct udevice *bus = dev->parent;
+ struct altera_spi_priv *priv = dev_get_priv(bus);
+ struct altera_spi_regs *const regs = priv->regs;
+ struct dm_spi_slave_platdata *slave_plat = dev_get_parent_plat(dev);
- debug("%s: bus:%i cs:%i\n", __func__, slave->bus, slave->cs);
- writel(0, altspi->base + ALTERA_SPI_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);
+ bus->seq, slave_plat->cs, bitlen, bytes, flags);
+
if (bitlen == 0)
goto done;
}
/* empty read buffer */
- if (readl(altspi->base + ALTERA_SPI_STATUS) &
- ALTERA_SPI_STATUS_RRDY_MSK)
- readl(altspi->base + ALTERA_SPI_RXDATA);
+ if (readl(®s->status) & ALTERA_SPI_STATUS_RRDY_MSK)
+ readl(®s->rxdata);
+
if (flags & SPI_XFER_BEGIN)
- spi_cs_activate(slave);
+ spi_cs_activate(dev, slave_plat->cs);
while (bytes--) {
- uchar d = txp ? *txp++ : CONFIG_ALTERA_SPI_IDLE_VAL;
- debug("%s: tx:%x ", __func__, d);
- writel(d, altspi->base + ALTERA_SPI_TXDATA);
- while (!(readl(altspi->base + ALTERA_SPI_STATUS) &
- ALTERA_SPI_STATUS_RRDY_MSK))
- ;
- d = readl(altspi->base + ALTERA_SPI_RXDATA);
+ if (txp)
+ data = *txp++;
+ else
+ data = CONFIG_ALTERA_SPI_IDLE_VAL;
+
+ debug("%s: tx:%x ", __func__, data);
+ writel(data, ®s->txdata);
+
+ start = get_timer(0);
+ while (1) {
+ reg = readl(®s->status);
+ if (reg & ALTERA_SPI_STATUS_RRDY_MSK)
+ break;
+ if (get_timer(start) > (CONFIG_SYS_HZ / 1000)) {
+ debug("%s: Transmission timed out!\n", __func__);
+ return -1;
+ }
+ }
+
+ data = readl(®s->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);
+ spi_cs_deactivate(dev);
return 0;
}
+
+static int altera_spi_set_speed(struct udevice *bus, uint speed)
+{
+ return 0;
+}
+
+static int altera_spi_set_mode(struct udevice *bus, uint mode)
+{
+ return 0;
+}
+
+static int altera_spi_probe(struct udevice *bus)
+{
+ struct altera_spi_platdata *plat = dev_get_plat(bus);
+ struct altera_spi_priv *priv = dev_get_priv(bus);
+
+ priv->regs = plat->regs;
+
+ return 0;
+}
+
+static int altera_spi_of_to_plat(struct udevice *bus)
+{
+ struct altera_spi_platdata *plat = dev_get_plat(bus);
+
+ plat->regs = map_physmem(dev_read_addr(bus),
+ sizeof(struct altera_spi_regs),
+ MAP_NOCACHE);
+
+ return 0;
+}
+
+static const struct dm_spi_ops altera_spi_ops = {
+ .claim_bus = altera_spi_claim_bus,
+ .release_bus = altera_spi_release_bus,
+ .xfer = altera_spi_xfer,
+ .set_speed = altera_spi_set_speed,
+ .set_mode = altera_spi_set_mode,
+ /*
+ * cs_info is not needed, since we require all chip selects to be
+ * in the device tree explicitly
+ */
+};
+
+static const struct udevice_id altera_spi_ids[] = {
+ { .compatible = "altr,spi-1.0" },
+ {}
+};
+
+U_BOOT_DRIVER(altera_spi) = {
+ .name = "altera_spi",
+ .id = UCLASS_SPI,
+ .of_match = altera_spi_ids,
+ .ops = &altera_spi_ops,
+ .of_to_plat = altera_spi_of_to_plat,
+ .plat_auto = sizeof(struct altera_spi_platdata),
+ .priv_auto = sizeof(struct altera_spi_priv),
+ .probe = altera_spi_probe,
+};
projects / J-u-boot.git / blobdiff