u-boot/drivers/spi/kirkwood_spi.c

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/*
* (C) Copyright 2009
* Marvell Semiconductor <www.marvell.com>
* Written-by: Prafulla Wadaskar <prafulla@marvell.com>
*
* Derived from drivers/spi/mpc8xxx_spi.c
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <dm.h>
#include <malloc.h>
#include <spi.h>
#include <asm/io.h>
#include <asm/arch/soc.h>
#ifdef CONFIG_KIRKWOOD
#include <asm/arch/mpp.h>
#endif
#include <asm/arch-mvebu/spi.h>
static void _spi_cs_activate(struct kwspi_registers *reg)
{
setbits_le32(&reg->ctrl, KWSPI_CSN_ACT);
}
static void _spi_cs_deactivate(struct kwspi_registers *reg)
{
clrbits_le32(&reg->ctrl, KWSPI_CSN_ACT);
}
static int _spi_xfer(struct kwspi_registers *reg, unsigned int bitlen,
const void *dout, void *din, unsigned long flags)
{
unsigned int tmpdout, tmpdin;
int tm, isread = 0;
debug("spi_xfer: dout %p din %p bitlen %u\n", dout, din, bitlen);
if (flags & SPI_XFER_BEGIN)
_spi_cs_activate(reg);
/*
* handle data in 8-bit chunks
* TBD: 2byte xfer mode to be enabled
*/
clrsetbits_le32(&reg->cfg, KWSPI_XFERLEN_MASK, KWSPI_XFERLEN_1BYTE);
while (bitlen > 4) {
debug("loopstart bitlen %d\n", bitlen);
tmpdout = 0;
/* Shift data so it's msb-justified */
if (dout)
tmpdout = *(u32 *)dout & 0xff;
clrbits_le32(&reg->irq_cause, KWSPI_SMEMRDIRQ);
writel(tmpdout, &reg->dout); /* Write the data out */
debug("*** spi_xfer: ... %08x written, bitlen %d\n",
tmpdout, bitlen);
/*
* Wait for SPI transmit to get out
* or time out (1 second = 1000 ms)
* The NE event must be read and cleared first
*/
for (tm = 0, isread = 0; tm < KWSPI_TIMEOUT; ++tm) {
if (readl(&reg->irq_cause) & KWSPI_SMEMRDIRQ) {
isread = 1;
tmpdin = readl(&reg->din);
debug("spi_xfer: din %p..%08x read\n",
din, tmpdin);
if (din) {
*((u8 *)din) = (u8)tmpdin;
din += 1;
}
if (dout)
dout += 1;
bitlen -= 8;
}
if (isread)
break;
}
if (tm >= KWSPI_TIMEOUT)
printf("*** spi_xfer: Time out during SPI transfer\n");
debug("loopend bitlen %d\n", bitlen);
}
if (flags & SPI_XFER_END)
_spi_cs_deactivate(reg);
return 0;
}
#ifndef CONFIG_DM_SPI
static struct kwspi_registers *spireg =
(struct kwspi_registers *)MVEBU_SPI_BASE;
#ifdef CONFIG_KIRKWOOD
static u32 cs_spi_mpp_back[2];
#endif
struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
unsigned int max_hz, unsigned int mode)
{
struct spi_slave *slave;
u32 data;
#ifdef CONFIG_KIRKWOOD
static const u32 kwspi_mpp_config[2][2] = {
{ MPP0_SPI_SCn, 0 }, /* if cs == 0 */
{ MPP7_SPI_SCn, 0 } /* if cs != 0 */
};
#endif
if (!spi_cs_is_valid(bus, cs))
return NULL;
slave = spi_alloc_slave_base(bus, cs);
if (!slave)
return NULL;
writel(KWSPI_SMEMRDY, &spireg->ctrl);
/* calculate spi clock prescaller using max_hz */
data = ((CONFIG_SYS_TCLK / 2) / max_hz) + 0x10;
data = data < KWSPI_CLKPRESCL_MIN ? KWSPI_CLKPRESCL_MIN : data;
data = data > KWSPI_CLKPRESCL_MASK ? KWSPI_CLKPRESCL_MASK : data;
/* program spi clock prescaller using max_hz */
writel(KWSPI_ADRLEN_3BYTE | data, &spireg->cfg);
debug("data = 0x%08x\n", data);
writel(KWSPI_SMEMRDIRQ, &spireg->irq_cause);
writel(KWSPI_IRQMASK, &spireg->irq_mask);
#ifdef CONFIG_KIRKWOOD
/* program mpp registers to select SPI_CSn */
kirkwood_mpp_conf(kwspi_mpp_config[cs ? 1 : 0], cs_spi_mpp_back);
#endif
return slave;
}
void spi_free_slave(struct spi_slave *slave)
{
#ifdef CONFIG_KIRKWOOD
kirkwood_mpp_conf(cs_spi_mpp_back, NULL);
#endif
free(slave);
}
#if defined(CONFIG_SYS_KW_SPI_MPP)
u32 spi_mpp_backup[4];
#endif
__attribute__((weak)) int board_spi_claim_bus(struct spi_slave *slave)
{
return 0;
}
int spi_claim_bus(struct spi_slave *slave)
{
#if defined(CONFIG_SYS_KW_SPI_MPP)
u32 config;
u32 spi_mpp_config[4];
config = CONFIG_SYS_KW_SPI_MPP;
if (config & MOSI_MPP6)
spi_mpp_config[0] = MPP6_SPI_MOSI;
else
spi_mpp_config[0] = MPP1_SPI_MOSI;
if (config & SCK_MPP10)
spi_mpp_config[1] = MPP10_SPI_SCK;
else
spi_mpp_config[1] = MPP2_SPI_SCK;
if (config & MISO_MPP11)
spi_mpp_config[2] = MPP11_SPI_MISO;
else
spi_mpp_config[2] = MPP3_SPI_MISO;
spi_mpp_config[3] = 0;
spi_mpp_backup[3] = 0;
/* set new spi mpp and save current mpp config */
kirkwood_mpp_conf(spi_mpp_config, spi_mpp_backup);
#endif
return board_spi_claim_bus(slave);
}
__attribute__((weak)) void board_spi_release_bus(struct spi_slave *slave)
{
}
void spi_release_bus(struct spi_slave *slave)
{
#if defined(CONFIG_SYS_KW_SPI_MPP)
kirkwood_mpp_conf(spi_mpp_backup, NULL);
#endif
board_spi_release_bus(slave);
}
#ifndef CONFIG_SPI_CS_IS_VALID
/*
* you can define this function board specific
* define above CONFIG in board specific config file and
* provide the function in board specific src file
*/
int spi_cs_is_valid(unsigned int bus, unsigned int cs)
{
return bus == 0 && (cs == 0 || cs == 1);
}
#endif
void spi_init(void)
{
}
void spi_cs_activate(struct spi_slave *slave)
{
_spi_cs_activate(spireg);
}
void spi_cs_deactivate(struct spi_slave *slave)
{
_spi_cs_deactivate(spireg);
}
int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
const void *dout, void *din, unsigned long flags)
{
return _spi_xfer(spireg, bitlen, dout, din, flags);
}
#else
/* Here now the DM part */
struct mvebu_spi_dev {
bool is_errata_50mhz_ac;
};
struct mvebu_spi_platdata {
struct kwspi_registers *spireg;
};
struct mvebu_spi_priv {
struct kwspi_registers *spireg;
};
static int mvebu_spi_set_speed(struct udevice *bus, uint hz)
{
struct mvebu_spi_platdata *plat = dev_get_platdata(bus);
struct kwspi_registers *reg = plat->spireg;
u32 data;
/* calculate spi clock prescaller using max_hz */
data = ((CONFIG_SYS_TCLK / 2) / hz) + 0x10;
data = data < KWSPI_CLKPRESCL_MIN ? KWSPI_CLKPRESCL_MIN : data;
data = data > KWSPI_CLKPRESCL_MASK ? KWSPI_CLKPRESCL_MASK : data;
/* program spi clock prescaler using max_hz */
writel(KWSPI_ADRLEN_3BYTE | data, &reg->cfg);
debug("data = 0x%08x\n", data);
return 0;
}
static void mvebu_spi_50mhz_ac_timing_erratum(struct udevice *bus, uint mode)
{
struct mvebu_spi_platdata *plat = dev_get_platdata(bus);
struct kwspi_registers *reg = plat->spireg;
u32 data;
/*
* Erratum description: (Erratum NO. FE-9144572) The device
* SPI interface supports frequencies of up to 50 MHz.
* However, due to this erratum, when the device core clock is
* 250 MHz and the SPI interfaces is configured for 50MHz SPI
* clock and CPOL=CPHA=1 there might occur data corruption on
* reads from the SPI device.
* Erratum Workaround:
* Work in one of the following configurations:
* 1. Set CPOL=CPHA=0 in "SPI Interface Configuration
* Register".
* 2. Set TMISO_SAMPLE value to 0x2 in "SPI Timing Parameters 1
* Register" before setting the interface.
*/
data = readl(&reg->timing1);
data &= ~KW_SPI_TMISO_SAMPLE_MASK;
if (CONFIG_SYS_TCLK == 250000000 &&
mode & SPI_CPOL &&
mode & SPI_CPHA)
data |= KW_SPI_TMISO_SAMPLE_2;
else
data |= KW_SPI_TMISO_SAMPLE_1;
writel(data, &reg->timing1);
}
static int mvebu_spi_set_mode(struct udevice *bus, uint mode)
{
struct mvebu_spi_platdata *plat = dev_get_platdata(bus);
struct kwspi_registers *reg = plat->spireg;
const struct mvebu_spi_dev *drvdata;
u32 data = readl(&reg->cfg);
data &= ~(KWSPI_CPHA | KWSPI_CPOL | KWSPI_RXLSBF | KWSPI_TXLSBF);
if (mode & SPI_CPHA)
data |= KWSPI_CPHA;
if (mode & SPI_CPOL)
data |= KWSPI_CPOL;
if (mode & SPI_LSB_FIRST)
data |= (KWSPI_RXLSBF | KWSPI_TXLSBF);
writel(data, &reg->cfg);
drvdata = (struct mvebu_spi_dev *)dev_get_driver_data(bus);
if (drvdata->is_errata_50mhz_ac)
mvebu_spi_50mhz_ac_timing_erratum(bus, mode);
return 0;
}
static int mvebu_spi_xfer(struct udevice *dev, unsigned int bitlen,
const void *dout, void *din, unsigned long flags)
{
struct udevice *bus = dev->parent;
struct mvebu_spi_platdata *plat = dev_get_platdata(bus);
return _spi_xfer(plat->spireg, bitlen, dout, din, flags);
}
static int mvebu_spi_claim_bus(struct udevice *dev)
{
struct udevice *bus = dev->parent;
struct mvebu_spi_platdata *plat = dev_get_platdata(bus);
/* Configure the chip-select in the CTRL register */
clrsetbits_le32(&plat->spireg->ctrl,
KWSPI_CS_MASK << KWSPI_CS_SHIFT,
spi_chip_select(dev) << KWSPI_CS_SHIFT);
return 0;
}
static int mvebu_spi_probe(struct udevice *bus)
{
struct mvebu_spi_platdata *plat = dev_get_platdata(bus);
struct kwspi_registers *reg = plat->spireg;
writel(KWSPI_SMEMRDY, &reg->ctrl);
writel(KWSPI_SMEMRDIRQ, &reg->irq_cause);
writel(KWSPI_IRQMASK, &reg->irq_mask);
return 0;
}
static int mvebu_spi_ofdata_to_platdata(struct udevice *bus)
{
struct mvebu_spi_platdata *plat = dev_get_platdata(bus);
plat->spireg = (struct kwspi_registers *)devfdt_get_addr(bus);
return 0;
}
static const struct dm_spi_ops mvebu_spi_ops = {
.claim_bus = mvebu_spi_claim_bus,
.xfer = mvebu_spi_xfer,
.set_speed = mvebu_spi_set_speed,
.set_mode = mvebu_spi_set_mode,
/*
* cs_info is not needed, since we require all chip selects to be
* in the device tree explicitly
*/
};
static const struct mvebu_spi_dev armada_xp_spi_dev_data = {
.is_errata_50mhz_ac = false,
};
static const struct mvebu_spi_dev armada_375_spi_dev_data = {
.is_errata_50mhz_ac = false,
};
static const struct mvebu_spi_dev armada_380_spi_dev_data = {
.is_errata_50mhz_ac = true,
};
static const struct udevice_id mvebu_spi_ids[] = {
{
.compatible = "marvell,armada-375-spi",
.data = (ulong)&armada_375_spi_dev_data
},
{
.compatible = "marvell,armada-380-spi",
.data = (ulong)&armada_380_spi_dev_data
},
{
.compatible = "marvell,armada-xp-spi",
.data = (ulong)&armada_xp_spi_dev_data
},
{ }
};
U_BOOT_DRIVER(mvebu_spi) = {
.name = "mvebu_spi",
.id = UCLASS_SPI,
.of_match = mvebu_spi_ids,
.ops = &mvebu_spi_ops,
.ofdata_to_platdata = mvebu_spi_ofdata_to_platdata,
.platdata_auto_alloc_size = sizeof(struct mvebu_spi_platdata),
.priv_auto_alloc_size = sizeof(struct mvebu_spi_priv),
.probe = mvebu_spi_probe,
};
#endif