+// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2008, Guennadi Liakhovetski <lg@denx.de>
- *
- * SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <log.h>
#include <malloc.h>
#include <spi.h>
-#include <asm/errno.h>
+#include <asm/global_data.h>
+#include <dm/device_compat.h>
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
#include <asm/io.h>
#include <asm/gpio.h>
#include <asm/arch/imx-regs.h>
#include <asm/arch/clock.h>
-#include <asm/imx-common/spi.h>
+#include <asm/mach-imx/spi.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* MX35 and older is CSPI */
+#if defined(CONFIG_MX25) || defined(CONFIG_MX31) || defined(CONFIG_MX35)
+#define MXC_CSPI
+struct cspi_regs {
+ u32 rxdata;
+ u32 txdata;
+ u32 ctrl;
+ u32 intr;
+ u32 dma;
+ u32 stat;
+ u32 period;
+ u32 test;
+};
+
+#define MXC_CSPICTRL_EN BIT(0)
+#define MXC_CSPICTRL_MODE BIT(1)
+#define MXC_CSPICTRL_XCH BIT(2)
+#define MXC_CSPICTRL_SMC BIT(3)
+#define MXC_CSPICTRL_POL BIT(4)
+#define MXC_CSPICTRL_PHA BIT(5)
+#define MXC_CSPICTRL_SSCTL BIT(6)
+#define MXC_CSPICTRL_SSPOL BIT(7)
+#define MXC_CSPICTRL_DATARATE(x) (((x) & 0x7) << 16)
+#define MXC_CSPICTRL_RXOVF BIT(6)
+#define MXC_CSPIPERIOD_32KHZ BIT(15)
+#define MAX_SPI_BYTES 4
+#if defined(CONFIG_MX25) || defined(CONFIG_MX35)
+#define MXC_CSPICTRL_CHIPSELECT(x) (((x) & 0x3) << 12)
+#define MXC_CSPICTRL_BITCOUNT(x) (((x) & 0xfff) << 20)
+#define MXC_CSPICTRL_TC BIT(7)
+#define MXC_CSPICTRL_MAXBITS 0xfff
+#else /* MX31 */
+#define MXC_CSPICTRL_CHIPSELECT(x) (((x) & 0x3) << 24)
+#define MXC_CSPICTRL_BITCOUNT(x) (((x) & 0x1f) << 8)
+#define MXC_CSPICTRL_TC BIT(8)
+#define MXC_CSPICTRL_MAXBITS 0x1f
+#endif
+
+#else /* MX51 and newer is ECSPI */
+#define MXC_ECSPI
+struct cspi_regs {
+ u32 rxdata;
+ u32 txdata;
+ u32 ctrl;
+ u32 cfg;
+ u32 intr;
+ u32 dma;
+ u32 stat;
+ u32 period;
+};
+
+#define MXC_CSPICTRL_EN BIT(0)
+#define MXC_CSPICTRL_MODE BIT(1)
+#define MXC_CSPICTRL_XCH BIT(2)
+#define MXC_CSPICTRL_MODE_MASK (0xf << 4)
+#define MXC_CSPICTRL_CHIPSELECT(x) (((x) & 0x3) << 12)
+#define MXC_CSPICTRL_BITCOUNT(x) (((x) & 0xfff) << 20)
+#define MXC_CSPICTRL_PREDIV(x) (((x) & 0xF) << 12)
+#define MXC_CSPICTRL_POSTDIV(x) (((x) & 0xF) << 8)
+#define MXC_CSPICTRL_SELCHAN(x) (((x) & 0x3) << 18)
+#define MXC_CSPICTRL_MAXBITS 0xfff
+#define MXC_CSPICTRL_TC BIT(7)
+#define MXC_CSPICTRL_RXOVF BIT(6)
+#define MXC_CSPIPERIOD_32KHZ BIT(15)
+#define MAX_SPI_BYTES 32
+
+/* Bit position inside CTRL register to be associated with SS */
+#define MXC_CSPICTRL_CHAN 18
+
+/* Bit position inside CON register to be associated with SS */
+#define MXC_CSPICON_PHA 0 /* SCLK phase control */
+#define MXC_CSPICON_POL 4 /* SCLK polarity */
+#define MXC_CSPICON_SSPOL 12 /* SS polarity */
+#define MXC_CSPICON_CTL 20 /* inactive state of SCLK */
+#endif
#ifdef CONFIG_MX27
/* i.MX27 has a completely wrong register layout and register definitions in the
"See linux mxc_spi driver from Freescale for details."
#endif
-static unsigned long spi_bases[] = {
- MXC_SPI_BASE_ADDRESSES
-};
-
__weak int board_spi_cs_gpio(unsigned bus, unsigned cs)
{
return -1;
#define CONFIG_SYS_SPI_MXC_WAIT (CONFIG_SYS_HZ/100) /* 10 ms */
#endif
+#define MAX_CS_COUNT 4
+
struct mxc_spi_slave {
struct spi_slave slave;
unsigned long base;
int ss_pol;
unsigned int max_hz;
unsigned int mode;
+ struct gpio_desc ss;
+ struct gpio_desc cs_gpios[MAX_CS_COUNT];
+ struct udevice *dev;
};
static inline struct mxc_spi_slave *to_mxc_spi_slave(struct spi_slave *slave)
return container_of(slave, struct mxc_spi_slave, slave);
}
-void spi_cs_activate(struct spi_slave *slave)
+static void mxc_spi_cs_activate(struct mxc_spi_slave *mxcs)
{
- struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave);
+#if CONFIG_IS_ENABLED(DM_SPI)
+ struct udevice *dev = mxcs->dev;
+ struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev);
+
+ u32 cs = slave_plat->cs;
+
+ if (!dm_gpio_is_valid(&mxcs->cs_gpios[cs]))
+ return;
+
+ dm_gpio_set_value(&mxcs->cs_gpios[cs], 1);
+#else
if (mxcs->gpio > 0)
gpio_set_value(mxcs->gpio, mxcs->ss_pol);
+#endif
}
-void spi_cs_deactivate(struct spi_slave *slave)
+static void mxc_spi_cs_deactivate(struct mxc_spi_slave *mxcs)
{
- struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave);
+#if CONFIG_IS_ENABLED(DM_SPI)
+ struct udevice *dev = mxcs->dev;
+ struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev);
+
+ u32 cs = slave_plat->cs;
+
+ if (!dm_gpio_is_valid(&mxcs->cs_gpios[cs]))
+ return;
+
+ dm_gpio_set_value(&mxcs->cs_gpios[cs], 0);
+#else
if (mxcs->gpio > 0)
- gpio_set_value(mxcs->gpio,
- !(mxcs->ss_pol));
+ gpio_set_value(mxcs->gpio, !(mxcs->ss_pol));
+#endif
}
u32 get_cspi_div(u32 div)
}
#endif
-int spi_xchg_single(struct spi_slave *slave, unsigned int bitlen,
+int spi_xchg_single(struct mxc_spi_slave *mxcs, unsigned int bitlen,
const u8 *dout, u8 *din, unsigned long flags)
{
- struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave);
int nbytes = DIV_ROUND_UP(bitlen, 8);
u32 data, cnt, i;
struct cspi_regs *regs = (struct cspi_regs *)mxcs->base;
u32 ts;
int status;
- debug("%s: bitlen %d dout 0x%x din 0x%x\n",
- __func__, bitlen, (u32)dout, (u32)din);
+ debug("%s: bitlen %d dout 0x%lx din 0x%lx\n",
+ __func__, bitlen, (ulong)dout, (ulong)din);
mxcs->ctrl_reg = (mxcs->ctrl_reg &
~MXC_CSPICTRL_BITCOUNT(MXC_CSPICTRL_MAXBITS)) |
tmp = reg_read(®s->rxdata);
data = cpu_to_be32(tmp);
debug("SPI Rx: 0x%x 0x%x\n", tmp, data);
- cnt = min(nbytes, sizeof(data));
+ cnt = min_t(u32, nbytes, sizeof(data));
if (din) {
memcpy(din, &data, cnt);
din += cnt;
}
-int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
- void *din, unsigned long flags)
+static int mxc_spi_xfer_internal(struct mxc_spi_slave *mxcs,
+ unsigned int bitlen, const void *dout,
+ void *din, unsigned long flags)
{
int n_bytes = DIV_ROUND_UP(bitlen, 8);
int n_bits;
u8 *p_outbuf = (u8 *)dout;
u8 *p_inbuf = (u8 *)din;
- if (!slave)
- return -1;
+ if (!mxcs)
+ return -EINVAL;
if (flags & SPI_XFER_BEGIN)
- spi_cs_activate(slave);
+ mxc_spi_cs_activate(mxcs);
while (n_bytes > 0) {
if (n_bytes < MAX_SPI_BYTES)
n_bits = blk_size * 8;
- ret = spi_xchg_single(slave, n_bits, p_outbuf, p_inbuf, 0);
+ ret = spi_xchg_single(mxcs, n_bits, p_outbuf, p_inbuf, 0);
if (ret)
return ret;
}
if (flags & SPI_XFER_END) {
- spi_cs_deactivate(slave);
+ mxc_spi_cs_deactivate(mxcs);
+ }
+
+ return 0;
+}
+
+static int mxc_spi_claim_bus_internal(struct mxc_spi_slave *mxcs, int cs)
+{
+ struct cspi_regs *regs = (struct cspi_regs *)mxcs->base;
+ int ret;
+
+ reg_write(®s->rxdata, 1);
+ udelay(1);
+ ret = spi_cfg_mxc(mxcs, cs);
+ if (ret) {
+ printf("mxc_spi: cannot setup SPI controller\n");
+ return ret;
}
+ reg_write(®s->period, MXC_CSPIPERIOD_32KHZ);
+ reg_write(®s->intr, 0);
return 0;
}
-void spi_init(void)
+#if !CONFIG_IS_ENABLED(DM_SPI)
+int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
+ void *din, unsigned long flags)
{
+ struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave);
+
+ return mxc_spi_xfer_internal(mxcs, bitlen, dout, din, flags);
}
/*
if (mxcs->gpio == -1)
return 0;
+ gpio_request(mxcs->gpio, "spi-cs");
ret = gpio_direction_output(mxcs->gpio, !(mxcs->ss_pol));
if (ret) {
printf("mxc_spi: cannot setup gpio %d\n", mxcs->gpio);
return 0;
}
+static unsigned long spi_bases[] = {
+ MXC_SPI_BASE_ADDRESSES
+};
+
struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
unsigned int max_hz, unsigned int mode)
{
int spi_claim_bus(struct spi_slave *slave)
{
- int ret;
struct mxc_spi_slave *mxcs = to_mxc_spi_slave(slave);
- struct cspi_regs *regs = (struct cspi_regs *)mxcs->base;
- reg_write(®s->rxdata, 1);
- udelay(1);
- ret = spi_cfg_mxc(mxcs, slave->cs);
- if (ret) {
- printf("mxc_spi: cannot setup SPI controller\n");
+ return mxc_spi_claim_bus_internal(mxcs, slave->cs);
+}
+
+void spi_release_bus(struct spi_slave *slave)
+{
+ /* TODO: Shut the controller down */
+}
+#else
+
+static int mxc_spi_probe(struct udevice *bus)
+{
+ struct mxc_spi_slave *mxcs = dev_get_plat(bus);
+ int node = dev_of_offset(bus);
+ const void *blob = gd->fdt_blob;
+ int ret;
+ int i;
+
+ ret = gpio_request_list_by_name(bus, "cs-gpios", mxcs->cs_gpios,
+ ARRAY_SIZE(mxcs->cs_gpios), 0);
+ if (ret < 0) {
+ pr_err("Can't get %s gpios! Error: %d", bus->name, ret);
return ret;
}
- reg_write(®s->period, MXC_CSPIPERIOD_32KHZ);
- reg_write(®s->intr, 0);
+
+ for (i = 0; i < ARRAY_SIZE(mxcs->cs_gpios); i++) {
+ if (!dm_gpio_is_valid(&mxcs->cs_gpios[i]))
+ continue;
+
+ ret = dm_gpio_set_dir_flags(&mxcs->cs_gpios[i],
+ GPIOD_IS_OUT | GPIOD_ACTIVE_LOW);
+ if (ret) {
+ dev_err(bus, "Setting cs %d error\n", i);
+ return ret;
+ }
+ }
+
+ mxcs->base = dev_read_addr(bus);
+ if (mxcs->base == FDT_ADDR_T_NONE)
+ return -ENODEV;
+
+#if CONFIG_IS_ENABLED(CLK)
+ struct clk clk;
+ ret = clk_get_by_index(bus, 0, &clk);
+ if (ret)
+ return ret;
+
+ clk_enable(&clk);
+
+ mxcs->max_hz = clk_get_rate(&clk);
+#else
+ mxcs->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency",
+ 20000000);
+#endif
return 0;
}
-void spi_release_bus(struct spi_slave *slave)
+static int mxc_spi_xfer(struct udevice *dev, unsigned int bitlen,
+ const void *dout, void *din, unsigned long flags)
{
- /* TODO: Shut the controller down */
+ struct mxc_spi_slave *mxcs = dev_get_plat(dev->parent);
+
+
+ return mxc_spi_xfer_internal(mxcs, bitlen, dout, din, flags);
}
+
+static int mxc_spi_claim_bus(struct udevice *dev)
+{
+ struct mxc_spi_slave *mxcs = dev_get_plat(dev->parent);
+ struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev);
+
+ mxcs->dev = dev;
+
+ return mxc_spi_claim_bus_internal(mxcs, slave_plat->cs);
+}
+
+static int mxc_spi_release_bus(struct udevice *dev)
+{
+ return 0;
+}
+
+static int mxc_spi_set_speed(struct udevice *bus, uint speed)
+{
+ struct mxc_spi_slave *mxcs = dev_get_plat(bus);
+
+ mxcs->max_hz = speed;
+
+ return 0;
+}
+
+static int mxc_spi_set_mode(struct udevice *bus, uint mode)
+{
+ struct mxc_spi_slave *mxcs = dev_get_plat(bus);
+
+ mxcs->mode = mode;
+ mxcs->ss_pol = (mode & SPI_CS_HIGH) ? 1 : 0;
+
+ return 0;
+}
+
+static const struct dm_spi_ops mxc_spi_ops = {
+ .claim_bus = mxc_spi_claim_bus,
+ .release_bus = mxc_spi_release_bus,
+ .xfer = mxc_spi_xfer,
+ .set_speed = mxc_spi_set_speed,
+ .set_mode = mxc_spi_set_mode,
+};
+
+static const struct udevice_id mxc_spi_ids[] = {
+ { .compatible = "fsl,imx51-ecspi" },
+ { }
+};
+
+U_BOOT_DRIVER(mxc_spi) = {
+ .name = "mxc_spi",
+ .id = UCLASS_SPI,
+ .of_match = mxc_spi_ids,
+ .ops = &mxc_spi_ops,
+ .plat_auto = sizeof(struct mxc_spi_slave),
+ .probe = mxc_spi_probe,
+};
+#endif
git.openpandora.org / pandora-u-boot.git / blobdiff