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u-boot/drivers/spi/davinci_spi.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

578 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
*
* Driver for SPI controller on DaVinci. Based on atmel_spi.c
* by Atmel Corporation
*
* Copyright (C) 2007 Atmel Corporation
*/
#include <common.h>
#include <spi.h>
#include <malloc.h>
#include <asm/io.h>
#include <asm/arch/hardware.h>
#include <dm.h>
/* SPIGCR0 */
#define SPIGCR0_SPIENA_MASK 0x1
#define SPIGCR0_SPIRST_MASK 0x0
/* SPIGCR0 */
#define SPIGCR1_CLKMOD_MASK BIT(1)
#define SPIGCR1_MASTER_MASK BIT(0)
#define SPIGCR1_SPIENA_MASK BIT(24)
/* SPIPC0 */
#define SPIPC0_DIFUN_MASK BIT(11) /* SIMO */
#define SPIPC0_DOFUN_MASK BIT(10) /* SOMI */
#define SPIPC0_CLKFUN_MASK BIT(9) /* CLK */
#define SPIPC0_EN0FUN_MASK BIT(0)
/* SPIFMT0 */
#define SPIFMT_SHIFTDIR_SHIFT 20
#define SPIFMT_POLARITY_SHIFT 17
#define SPIFMT_PHASE_SHIFT 16
#define SPIFMT_PRESCALE_SHIFT 8
/* SPIDAT1 */
#define SPIDAT1_CSHOLD_SHIFT 28
#define SPIDAT1_CSNR_SHIFT 16
/* SPIDELAY */
#define SPI_C2TDELAY_SHIFT 24
#define SPI_T2CDELAY_SHIFT 16
/* SPIBUF */
#define SPIBUF_RXEMPTY_MASK BIT(31)
#define SPIBUF_TXFULL_MASK BIT(29)
/* SPIDEF */
#define SPIDEF_CSDEF0_MASK BIT(0)
#ifndef CONFIG_DM_SPI
#define SPI0_BUS 0
#define SPI0_BASE CONFIG_SYS_SPI_BASE
/*
* Define default SPI0_NUM_CS as 1 for existing platforms that uses this
* driver. Platform can configure number of CS using CONFIG_SYS_SPI0_NUM_CS
* if more than one CS is supported and by defining CONFIG_SYS_SPI0.
*/
#ifndef CONFIG_SYS_SPI0
#define SPI0_NUM_CS 1
#else
#define SPI0_NUM_CS CONFIG_SYS_SPI0_NUM_CS
#endif
/*
* define CONFIG_SYS_SPI1 when platform has spi-1 device (bus #1) and
* CONFIG_SYS_SPI1_NUM_CS defines number of CS on this bus
*/
#ifdef CONFIG_SYS_SPI1
#define SPI1_BUS 1
#define SPI1_NUM_CS CONFIG_SYS_SPI1_NUM_CS
#define SPI1_BASE CONFIG_SYS_SPI1_BASE
#endif
/*
* define CONFIG_SYS_SPI2 when platform has spi-2 device (bus #2) and
* CONFIG_SYS_SPI2_NUM_CS defines number of CS on this bus
*/
#ifdef CONFIG_SYS_SPI2
#define SPI2_BUS 2
#define SPI2_NUM_CS CONFIG_SYS_SPI2_NUM_CS
#define SPI2_BASE CONFIG_SYS_SPI2_BASE
#endif
#endif
DECLARE_GLOBAL_DATA_PTR;
/* davinci spi register set */
struct davinci_spi_regs {
dv_reg gcr0; /* 0x00 */
dv_reg gcr1; /* 0x04 */
dv_reg int0; /* 0x08 */
dv_reg lvl; /* 0x0c */
dv_reg flg; /* 0x10 */
dv_reg pc0; /* 0x14 */
dv_reg pc1; /* 0x18 */
dv_reg pc2; /* 0x1c */
dv_reg pc3; /* 0x20 */
dv_reg pc4; /* 0x24 */
dv_reg pc5; /* 0x28 */
dv_reg rsvd[3];
dv_reg dat0; /* 0x38 */
dv_reg dat1; /* 0x3c */
dv_reg buf; /* 0x40 */
dv_reg emu; /* 0x44 */
dv_reg delay; /* 0x48 */
dv_reg def; /* 0x4c */
dv_reg fmt0; /* 0x50 */
dv_reg fmt1; /* 0x54 */
dv_reg fmt2; /* 0x58 */
dv_reg fmt3; /* 0x5c */
dv_reg intvec0; /* 0x60 */
dv_reg intvec1; /* 0x64 */
};
/* davinci spi slave */
struct davinci_spi_slave {
#ifndef CONFIG_DM_SPI
struct spi_slave slave;
#endif
struct davinci_spi_regs *regs;
unsigned int freq; /* current SPI bus frequency */
unsigned int mode; /* current SPI mode used */
u8 num_cs; /* total no. of CS available */
u8 cur_cs; /* CS of current slave */
bool half_duplex; /* true, if master is half-duplex only */
};
/*
* This functions needs to act like a macro to avoid pipeline reloads in the
* loops below. Use always_inline. This gains us about 160KiB/s and the bloat
* appears to be zero bytes (da830).
*/
__attribute__((always_inline))
static inline u32 davinci_spi_xfer_data(struct davinci_spi_slave *ds, u32 data)
{
u32 buf_reg_val;
/* send out data */
writel(data, &ds->regs->dat1);
/* wait for the data to clock in/out */
while ((buf_reg_val = readl(&ds->regs->buf)) & SPIBUF_RXEMPTY_MASK)
;
return buf_reg_val;
}
static int davinci_spi_read(struct davinci_spi_slave *ds, unsigned int len,
u8 *rxp, unsigned long flags)
{
unsigned int data1_reg_val;
/* enable CS hold, CS[n] and clear the data bits */
data1_reg_val = ((1 << SPIDAT1_CSHOLD_SHIFT) |
(ds->cur_cs << SPIDAT1_CSNR_SHIFT));
/* wait till TXFULL is deasserted */
while (readl(&ds->regs->buf) & SPIBUF_TXFULL_MASK)
;
/* preload the TX buffer to avoid clock starvation */
writel(data1_reg_val, &ds->regs->dat1);
/* keep reading 1 byte until only 1 byte left */
while ((len--) > 1)
*rxp++ = davinci_spi_xfer_data(ds, data1_reg_val);
/* clear CS hold when we reach the end */
if (flags & SPI_XFER_END)
data1_reg_val &= ~(1 << SPIDAT1_CSHOLD_SHIFT);
/* read the last byte */
*rxp = davinci_spi_xfer_data(ds, data1_reg_val);
return 0;
}
static int davinci_spi_write(struct davinci_spi_slave *ds, unsigned int len,
const u8 *txp, unsigned long flags)
{
unsigned int data1_reg_val;
/* enable CS hold and clear the data bits */
data1_reg_val = ((1 << SPIDAT1_CSHOLD_SHIFT) |
(ds->cur_cs << SPIDAT1_CSNR_SHIFT));
/* wait till TXFULL is deasserted */
while (readl(&ds->regs->buf) & SPIBUF_TXFULL_MASK)
;
/* preload the TX buffer to avoid clock starvation */
if (len > 2) {
writel(data1_reg_val | *txp++, &ds->regs->dat1);
len--;
}
/* keep writing 1 byte until only 1 byte left */
while ((len--) > 1)
davinci_spi_xfer_data(ds, data1_reg_val | *txp++);
/* clear CS hold when we reach the end */
if (flags & SPI_XFER_END)
data1_reg_val &= ~(1 << SPIDAT1_CSHOLD_SHIFT);
/* write the last byte */
davinci_spi_xfer_data(ds, data1_reg_val | *txp);
return 0;
}
static int davinci_spi_read_write(struct davinci_spi_slave *ds, unsigned
int len, u8 *rxp, const u8 *txp,
unsigned long flags)
{
unsigned int data1_reg_val;
/* enable CS hold and clear the data bits */
data1_reg_val = ((1 << SPIDAT1_CSHOLD_SHIFT) |
(ds->cur_cs << SPIDAT1_CSNR_SHIFT));
/* wait till TXFULL is deasserted */
while (readl(&ds->regs->buf) & SPIBUF_TXFULL_MASK)
;
/* keep reading and writing 1 byte until only 1 byte left */
while ((len--) > 1)
*rxp++ = davinci_spi_xfer_data(ds, data1_reg_val | *txp++);
/* clear CS hold when we reach the end */
if (flags & SPI_XFER_END)
data1_reg_val &= ~(1 << SPIDAT1_CSHOLD_SHIFT);
/* read and write the last byte */
*rxp = davinci_spi_xfer_data(ds, data1_reg_val | *txp);
return 0;
}
static int __davinci_spi_claim_bus(struct davinci_spi_slave *ds, int cs)
{
unsigned int mode = 0, scalar;
/* Enable the SPI hardware */
writel(SPIGCR0_SPIRST_MASK, &ds->regs->gcr0);
udelay(1000);
writel(SPIGCR0_SPIENA_MASK, &ds->regs->gcr0);
/* Set master mode, powered up and not activated */
writel(SPIGCR1_MASTER_MASK | SPIGCR1_CLKMOD_MASK, &ds->regs->gcr1);
/* CS, CLK, SIMO and SOMI are functional pins */
writel(((1 << cs) | SPIPC0_CLKFUN_MASK |
SPIPC0_DOFUN_MASK | SPIPC0_DIFUN_MASK), &ds->regs->pc0);
/* setup format */
scalar = ((CONFIG_SYS_SPI_CLK / ds->freq) - 1) & 0xFF;
/*
* Use following format:
* character length = 8,
* MSB shifted out first
*/
if (ds->mode & SPI_CPOL)
mode |= SPI_CPOL;
if (!(ds->mode & SPI_CPHA))
mode |= SPI_CPHA;
writel(8 | (scalar << SPIFMT_PRESCALE_SHIFT) |
(mode << SPIFMT_PHASE_SHIFT), &ds->regs->fmt0);
/*
* Including a minor delay. No science here. Should be good even with
* no delay
*/
writel((50 << SPI_C2TDELAY_SHIFT) |
(50 << SPI_T2CDELAY_SHIFT), &ds->regs->delay);
/* default chip select register */
writel(SPIDEF_CSDEF0_MASK, &ds->regs->def);
/* no interrupts */
writel(0, &ds->regs->int0);
writel(0, &ds->regs->lvl);
/* enable SPI */
writel((readl(&ds->regs->gcr1) | SPIGCR1_SPIENA_MASK), &ds->regs->gcr1);
return 0;
}
static int __davinci_spi_release_bus(struct davinci_spi_slave *ds)
{
/* Disable the SPI hardware */
writel(SPIGCR0_SPIRST_MASK, &ds->regs->gcr0);
return 0;
}
static int __davinci_spi_xfer(struct davinci_spi_slave *ds,
unsigned int bitlen, const void *dout, void *din,
unsigned long flags)
{
unsigned int len;
if (bitlen == 0)
/* Finish any previously submitted transfers */
goto out;
/*
* It's not clear how non-8-bit-aligned transfers are supposed to be
* represented as a stream of bytes...this is a limitation of
* the current SPI interface - here we terminate on receiving such a
* transfer request.
*/
if (bitlen % 8) {
/* Errors always terminate an ongoing transfer */
flags |= SPI_XFER_END;
goto out;
}
len = bitlen / 8;
if (!dout)
return davinci_spi_read(ds, len, din, flags);
if (!din)
return davinci_spi_write(ds, len, dout, flags);
if (!ds->half_duplex)
return davinci_spi_read_write(ds, len, din, dout, flags);
printf("SPI full duplex not supported\n");
flags |= SPI_XFER_END;
out:
if (flags & SPI_XFER_END) {
u8 dummy = 0;
davinci_spi_write(ds, 1, &dummy, flags);
}
return 0;
}
#ifndef CONFIG_DM_SPI
static inline struct davinci_spi_slave *to_davinci_spi(struct spi_slave *slave)
{
return container_of(slave, struct davinci_spi_slave, slave);
}
int spi_cs_is_valid(unsigned int bus, unsigned int cs)
{
int ret = 0;
switch (bus) {
case SPI0_BUS:
if (cs < SPI0_NUM_CS)
ret = 1;
break;
#ifdef CONFIG_SYS_SPI1
case SPI1_BUS:
if (cs < SPI1_NUM_CS)
ret = 1;
break;
#endif
#ifdef CONFIG_SYS_SPI2
case SPI2_BUS:
if (cs < SPI2_NUM_CS)
ret = 1;
break;
#endif
default:
/* Invalid bus number. Do nothing */
break;
}
return ret;
}
void spi_cs_activate(struct spi_slave *slave)
{
/* do nothing */
}
void spi_cs_deactivate(struct spi_slave *slave)
{
/* do nothing */
}
void spi_init(void)
{
/* do nothing */
}
struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
unsigned int max_hz, unsigned int mode)
{
struct davinci_spi_slave *ds;
if (!spi_cs_is_valid(bus, cs))
return NULL;
ds = spi_alloc_slave(struct davinci_spi_slave, bus, cs);
if (!ds)
return NULL;
switch (bus) {
case SPI0_BUS:
ds->regs = (struct davinci_spi_regs *)SPI0_BASE;
break;
#ifdef CONFIG_SYS_SPI1
case SPI1_BUS:
ds->regs = (struct davinci_spi_regs *)SPI1_BASE;
break;
#endif
#ifdef CONFIG_SYS_SPI2
case SPI2_BUS:
ds->regs = (struct davinci_spi_regs *)SPI2_BASE;
break;
#endif
default: /* Invalid bus number */
return NULL;
}
ds->freq = max_hz;
ds->mode = mode;
return &ds->slave;
}
void spi_free_slave(struct spi_slave *slave)
{
struct davinci_spi_slave *ds = to_davinci_spi(slave);
free(ds);
}
int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
const void *dout, void *din, unsigned long flags)
{
struct davinci_spi_slave *ds = to_davinci_spi(slave);
ds->cur_cs = slave->cs;
return __davinci_spi_xfer(ds, bitlen, dout, din, flags);
}
int spi_claim_bus(struct spi_slave *slave)
{
struct davinci_spi_slave *ds = to_davinci_spi(slave);
#ifdef CONFIG_SPI_HALF_DUPLEX
ds->half_duplex = true;
#else
ds->half_duplex = false;
#endif
return __davinci_spi_claim_bus(ds, ds->slave.cs);
}
void spi_release_bus(struct spi_slave *slave)
{
struct davinci_spi_slave *ds = to_davinci_spi(slave);
__davinci_spi_release_bus(ds);
}
#else
static int davinci_spi_set_speed(struct udevice *bus, uint max_hz)
{
struct davinci_spi_slave *ds = dev_get_priv(bus);
debug("%s speed %u\n", __func__, max_hz);
if (max_hz > CONFIG_SYS_SPI_CLK / 2)
return -EINVAL;
ds->freq = max_hz;
return 0;
}
static int davinci_spi_set_mode(struct udevice *bus, uint mode)
{
struct davinci_spi_slave *ds = dev_get_priv(bus);
debug("%s mode %u\n", __func__, mode);
ds->mode = mode;
return 0;
}
static int davinci_spi_claim_bus(struct udevice *dev)
{
struct dm_spi_slave_platdata *slave_plat =
dev_get_parent_platdata(dev);
struct udevice *bus = dev->parent;
struct davinci_spi_slave *ds = dev_get_priv(bus);
if (slave_plat->cs >= ds->num_cs) {
printf("Invalid SPI chipselect\n");
return -EINVAL;
}
ds->half_duplex = slave_plat->mode & SPI_PREAMBLE;
return __davinci_spi_claim_bus(ds, slave_plat->cs);
}
static int davinci_spi_release_bus(struct udevice *dev)
{
struct davinci_spi_slave *ds = dev_get_priv(dev->parent);
return __davinci_spi_release_bus(ds);
}
static int davinci_spi_xfer(struct udevice *dev, unsigned int bitlen,
const void *dout, void *din,
unsigned long flags)
{
struct dm_spi_slave_platdata *slave =
dev_get_parent_platdata(dev);
struct udevice *bus = dev->parent;
struct davinci_spi_slave *ds = dev_get_priv(bus);
if (slave->cs >= ds->num_cs) {
printf("Invalid SPI chipselect\n");
return -EINVAL;
}
ds->cur_cs = slave->cs;
return __davinci_spi_xfer(ds, bitlen, dout, din, flags);
}
static int davinci_spi_probe(struct udevice *bus)
{
/* Nothing to do */
return 0;
}
static int davinci_ofdata_to_platadata(struct udevice *bus)
{
struct davinci_spi_slave *ds = dev_get_priv(bus);
const void *blob = gd->fdt_blob;
int node = dev_of_offset(bus);
ds->regs = devfdt_map_physmem(bus, sizeof(struct davinci_spi_regs));
if (!ds->regs) {
printf("%s: could not map device address\n", __func__);
return -EINVAL;
}
ds->num_cs = fdtdec_get_int(blob, node, "num-cs", 4);
return 0;
}
static const struct dm_spi_ops davinci_spi_ops = {
.claim_bus = davinci_spi_claim_bus,
.release_bus = davinci_spi_release_bus,
.xfer = davinci_spi_xfer,
.set_speed = davinci_spi_set_speed,
.set_mode = davinci_spi_set_mode,
};
static const struct udevice_id davinci_spi_ids[] = {
{ .compatible = "ti,keystone-spi" },
{ .compatible = "ti,dm6441-spi" },
{ .compatible = "ti,da830-spi" },
{ }
};
U_BOOT_DRIVER(davinci_spi) = {
.name = "davinci_spi",
.id = UCLASS_SPI,
.of_match = davinci_spi_ids,
.ops = &davinci_spi_ops,
.ofdata_to_platdata = davinci_ofdata_to_platadata,
.priv_auto_alloc_size = sizeof(struct davinci_spi_slave),
.probe = davinci_spi_probe,
};
#endif
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