u-boot/drivers/spi/ti_qspi.c
Vignesh R a6f56ad1ee spi: ti_qspi: dra7xx: Add support to use 76.8MHz clock
According to AM572x DM SPRS953A, QSPI bus speed can be 76.8MHz, update
the driver to use the same.

Signed-off-by: Vignesh R <vigneshr@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Jagan Teki <jteki@openedev.com>
Reviewed-by: Mugunthan V N <mugunthanvnm@ti.com>
2016-07-30 00:15:00 +05:30

598 lines
14 KiB
C

/*
* TI QSPI driver
*
* Copyright (C) 2013, Texas Instruments, Incorporated
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <asm/arch/omap.h>
#include <malloc.h>
#include <spi.h>
#include <dm.h>
#include <asm/gpio.h>
#include <asm/omap_gpio.h>
#include <asm/omap_common.h>
#include <asm/ti-common/ti-edma3.h>
DECLARE_GLOBAL_DATA_PTR;
/* ti qpsi register bit masks */
#define QSPI_TIMEOUT 2000000
#define QSPI_FCLK 192000000
#define QSPI_DRA7XX_FCLK 76800000
/* clock control */
#define QSPI_CLK_EN BIT(31)
#define QSPI_CLK_DIV_MAX 0xffff
/* command */
#define QSPI_EN_CS(n) (n << 28)
#define QSPI_WLEN(n) ((n-1) << 19)
#define QSPI_3_PIN BIT(18)
#define QSPI_RD_SNGL BIT(16)
#define QSPI_WR_SNGL (2 << 16)
#define QSPI_INVAL (4 << 16)
#define QSPI_RD_QUAD (7 << 16)
/* device control */
#define QSPI_DD(m, n) (m << (3 + n*8))
#define QSPI_CKPHA(n) (1 << (2 + n*8))
#define QSPI_CSPOL(n) (1 << (1 + n*8))
#define QSPI_CKPOL(n) (1 << (n*8))
/* status */
#define QSPI_WC BIT(1)
#define QSPI_BUSY BIT(0)
#define QSPI_WC_BUSY (QSPI_WC | QSPI_BUSY)
#define QSPI_XFER_DONE QSPI_WC
#define MM_SWITCH 0x01
#define MEM_CS(cs) ((cs + 1) << 8)
#define MEM_CS_UNSELECT 0xfffff8ff
#define MMAP_START_ADDR_DRA 0x5c000000
#define MMAP_START_ADDR_AM43x 0x30000000
#define CORE_CTRL_IO 0x4a002558
#define QSPI_CMD_READ (0x3 << 0)
#define QSPI_CMD_READ_DUAL (0x6b << 0)
#define QSPI_CMD_READ_QUAD (0x6c << 0)
#define QSPI_CMD_READ_FAST (0x0b << 0)
#define QSPI_SETUP0_NUM_A_BYTES (0x3 << 8)
#define QSPI_SETUP0_NUM_D_BYTES_NO_BITS (0x0 << 10)
#define QSPI_SETUP0_NUM_D_BYTES_8_BITS (0x1 << 10)
#define QSPI_SETUP0_READ_NORMAL (0x0 << 12)
#define QSPI_SETUP0_READ_DUAL (0x1 << 12)
#define QSPI_SETUP0_READ_QUAD (0x3 << 12)
#define QSPI_CMD_WRITE (0x12 << 16)
#define QSPI_NUM_DUMMY_BITS (0x0 << 24)
/* ti qspi register set */
struct ti_qspi_regs {
u32 pid;
u32 pad0[3];
u32 sysconfig;
u32 pad1[3];
u32 int_stat_raw;
u32 int_stat_en;
u32 int_en_set;
u32 int_en_ctlr;
u32 intc_eoi;
u32 pad2[3];
u32 clk_ctrl;
u32 dc;
u32 cmd;
u32 status;
u32 data;
u32 setup0;
u32 setup1;
u32 setup2;
u32 setup3;
u32 memswitch;
u32 data1;
u32 data2;
u32 data3;
};
/* ti qspi priv */
struct ti_qspi_priv {
#ifndef CONFIG_DM_SPI
struct spi_slave slave;
#else
void *memory_map;
uint max_hz;
u32 num_cs;
#endif
struct ti_qspi_regs *base;
void *ctrl_mod_mmap;
ulong fclk;
unsigned int mode;
u32 cmd;
u32 dc;
};
static void ti_spi_set_speed(struct ti_qspi_priv *priv, uint hz)
{
uint clk_div;
if (!hz)
clk_div = 0;
else
clk_div = (priv->fclk / hz) - 1;
debug("ti_spi_set_speed: hz: %d, clock divider %d\n", hz, clk_div);
/* disable SCLK */
writel(readl(&priv->base->clk_ctrl) & ~QSPI_CLK_EN,
&priv->base->clk_ctrl);
/* assign clk_div values */
if (clk_div < 0)
clk_div = 0;
else if (clk_div > QSPI_CLK_DIV_MAX)
clk_div = QSPI_CLK_DIV_MAX;
/* enable SCLK */
writel(QSPI_CLK_EN | clk_div, &priv->base->clk_ctrl);
}
static void ti_qspi_cs_deactivate(struct ti_qspi_priv *priv)
{
writel(priv->cmd | QSPI_INVAL, &priv->base->cmd);
/* dummy readl to ensure bus sync */
readl(&priv->base->cmd);
}
static int __ti_qspi_set_mode(struct ti_qspi_priv *priv, unsigned int mode)
{
priv->dc = 0;
if (mode & SPI_CPHA)
priv->dc |= QSPI_CKPHA(0);
if (mode & SPI_CPOL)
priv->dc |= QSPI_CKPOL(0);
if (mode & SPI_CS_HIGH)
priv->dc |= QSPI_CSPOL(0);
return 0;
}
static int __ti_qspi_claim_bus(struct ti_qspi_priv *priv, int cs)
{
writel(priv->dc, &priv->base->dc);
writel(0, &priv->base->cmd);
writel(0, &priv->base->data);
priv->dc <<= cs * 8;
writel(priv->dc, &priv->base->dc);
return 0;
}
static void __ti_qspi_release_bus(struct ti_qspi_priv *priv)
{
writel(0, &priv->base->dc);
writel(0, &priv->base->cmd);
writel(0, &priv->base->data);
}
static void ti_qspi_ctrl_mode_mmap(void *ctrl_mod_mmap, int cs, bool enable)
{
u32 val;
val = readl(ctrl_mod_mmap);
if (enable)
val |= MEM_CS(cs);
else
val &= MEM_CS_UNSELECT;
writel(val, ctrl_mod_mmap);
}
static int __ti_qspi_xfer(struct ti_qspi_priv *priv, unsigned int bitlen,
const void *dout, void *din, unsigned long flags,
u32 cs)
{
uint words = bitlen >> 3; /* fixed 8-bit word length */
const uchar *txp = dout;
uchar *rxp = din;
uint status;
int timeout;
/* Setup mmap flags */
if (flags & SPI_XFER_MMAP) {
writel(MM_SWITCH, &priv->base->memswitch);
if (priv->ctrl_mod_mmap)
ti_qspi_ctrl_mode_mmap(priv->ctrl_mod_mmap, cs, true);
return 0;
} else if (flags & SPI_XFER_MMAP_END) {
writel(~MM_SWITCH, &priv->base->memswitch);
if (priv->ctrl_mod_mmap)
ti_qspi_ctrl_mode_mmap(priv->ctrl_mod_mmap, cs, false);
return 0;
}
if (bitlen == 0)
return -1;
if (bitlen % 8) {
debug("spi_xfer: Non byte aligned SPI transfer\n");
return -1;
}
/* Setup command reg */
priv->cmd = 0;
priv->cmd |= QSPI_WLEN(8);
priv->cmd |= QSPI_EN_CS(cs);
if (priv->mode & SPI_3WIRE)
priv->cmd |= QSPI_3_PIN;
priv->cmd |= 0xfff;
/* FIXME: This delay is required for successfull
* completion of read/write/erase. Once its root
* caused, it will be remove from the driver.
*/
#ifdef CONFIG_AM43XX
udelay(100);
#endif
while (words--) {
if (txp) {
debug("tx cmd %08x dc %08x data %02x\n",
priv->cmd | QSPI_WR_SNGL, priv->dc, *txp);
writel(*txp++, &priv->base->data);
writel(priv->cmd | QSPI_WR_SNGL,
&priv->base->cmd);
status = readl(&priv->base->status);
timeout = QSPI_TIMEOUT;
while ((status & QSPI_WC_BUSY) != QSPI_XFER_DONE) {
if (--timeout < 0) {
printf("spi_xfer: TX timeout!\n");
return -1;
}
status = readl(&priv->base->status);
}
debug("tx done, status %08x\n", status);
}
if (rxp) {
debug("rx cmd %08x dc %08x\n",
((u32)(priv->cmd | QSPI_RD_SNGL)), priv->dc);
writel(priv->cmd | QSPI_RD_SNGL, &priv->base->cmd);
status = readl(&priv->base->status);
timeout = QSPI_TIMEOUT;
while ((status & QSPI_WC_BUSY) != QSPI_XFER_DONE) {
if (--timeout < 0) {
printf("spi_xfer: RX timeout!\n");
return -1;
}
status = readl(&priv->base->status);
}
*rxp++ = readl(&priv->base->data);
debug("rx done, status %08x, read %02x\n",
status, *(rxp-1));
}
}
/* Terminate frame */
if (flags & SPI_XFER_END)
ti_qspi_cs_deactivate(priv);
return 0;
}
/* TODO: control from sf layer to here through dm-spi */
#if defined(CONFIG_TI_EDMA3) && !defined(CONFIG_DMA)
void spi_flash_copy_mmap(void *data, void *offset, size_t len)
{
unsigned int addr = (unsigned int) (data);
unsigned int edma_slot_num = 1;
/* Invalidate the area, so no writeback into the RAM races with DMA */
invalidate_dcache_range(addr, addr + roundup(len, ARCH_DMA_MINALIGN));
/* enable edma3 clocks */
enable_edma3_clocks();
/* Call edma3 api to do actual DMA transfer */
edma3_transfer(EDMA3_BASE, edma_slot_num, data, offset, len);
/* disable edma3 clocks */
disable_edma3_clocks();
*((unsigned int *)offset) += len;
}
#endif
#ifndef CONFIG_DM_SPI
static inline struct ti_qspi_priv *to_ti_qspi_priv(struct spi_slave *slave)
{
return container_of(slave, struct ti_qspi_priv, slave);
}
int spi_cs_is_valid(unsigned int bus, unsigned int cs)
{
return 1;
}
void spi_cs_activate(struct spi_slave *slave)
{
/* CS handled in xfer */
return;
}
void spi_cs_deactivate(struct spi_slave *slave)
{
struct ti_qspi_priv *priv = to_ti_qspi_priv(slave);
ti_qspi_cs_deactivate(priv);
}
void spi_init(void)
{
/* nothing to do */
}
static void ti_spi_setup_spi_register(struct ti_qspi_priv *priv)
{
u32 memval = 0;
#ifdef CONFIG_QSPI_QUAD_SUPPORT
struct spi_slave *slave = &priv->slave;
memval |= (QSPI_CMD_READ_QUAD | QSPI_SETUP0_NUM_A_BYTES |
QSPI_SETUP0_NUM_D_BYTES_8_BITS |
QSPI_SETUP0_READ_QUAD | QSPI_CMD_WRITE |
QSPI_NUM_DUMMY_BITS);
slave->mode_rx = SPI_RX_QUAD;
#else
memval |= QSPI_CMD_READ | QSPI_SETUP0_NUM_A_BYTES |
QSPI_SETUP0_NUM_D_BYTES_NO_BITS |
QSPI_SETUP0_READ_NORMAL | QSPI_CMD_WRITE |
QSPI_NUM_DUMMY_BITS;
#endif
writel(memval, &priv->base->setup0);
}
struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
unsigned int max_hz, unsigned int mode)
{
struct ti_qspi_priv *priv;
#ifdef CONFIG_AM43XX
gpio_request(CONFIG_QSPI_SEL_GPIO, "qspi_gpio");
gpio_direction_output(CONFIG_QSPI_SEL_GPIO, 1);
#endif
priv = spi_alloc_slave(struct ti_qspi_priv, bus, cs);
if (!priv) {
printf("SPI_error: Fail to allocate ti_qspi_priv\n");
return NULL;
}
priv->base = (struct ti_qspi_regs *)QSPI_BASE;
priv->mode = mode;
#if defined(CONFIG_DRA7XX) || defined(CONFIG_AM57XX)
priv->ctrl_mod_mmap = (void *)CORE_CTRL_IO;
priv->slave.memory_map = (void *)MMAP_START_ADDR_DRA;
priv->fclk = QSPI_DRA7XX_FCLK;
#else
priv->slave.memory_map = (void *)MMAP_START_ADDR_AM43x;
priv->fclk = QSPI_FCLK;
#endif
ti_spi_set_speed(priv, max_hz);
#ifdef CONFIG_TI_SPI_MMAP
ti_spi_setup_spi_register(priv);
#endif
return &priv->slave;
}
void spi_free_slave(struct spi_slave *slave)
{
struct ti_qspi_priv *priv = to_ti_qspi_priv(slave);
free(priv);
}
int spi_claim_bus(struct spi_slave *slave)
{
struct ti_qspi_priv *priv = to_ti_qspi_priv(slave);
debug("%s: bus:%i cs:%i\n", __func__, priv->slave.bus, priv->slave.cs);
__ti_qspi_set_mode(priv, priv->mode);
return __ti_qspi_claim_bus(priv, priv->slave.cs);
}
void spi_release_bus(struct spi_slave *slave)
{
struct ti_qspi_priv *priv = to_ti_qspi_priv(slave);
debug("%s: bus:%i cs:%i\n", __func__, priv->slave.bus, priv->slave.cs);
__ti_qspi_release_bus(priv);
}
int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
void *din, unsigned long flags)
{
struct ti_qspi_priv *priv = to_ti_qspi_priv(slave);
debug("spi_xfer: bus:%i cs:%i bitlen:%i flags:%lx\n",
priv->slave.bus, priv->slave.cs, bitlen, flags);
return __ti_qspi_xfer(priv, bitlen, dout, din, flags, priv->slave.cs);
}
#else /* CONFIG_DM_SPI */
static void __ti_qspi_setup_memorymap(struct ti_qspi_priv *priv,
struct spi_slave *slave,
bool enable)
{
u32 memval;
u32 mode = slave->mode_rx & (SPI_RX_QUAD | SPI_RX_DUAL);
if (!enable) {
writel(0, &priv->base->setup0);
return;
}
memval = QSPI_SETUP0_NUM_A_BYTES | QSPI_CMD_WRITE | QSPI_NUM_DUMMY_BITS;
switch (mode) {
case SPI_RX_QUAD:
memval |= QSPI_CMD_READ_QUAD;
memval |= QSPI_SETUP0_NUM_D_BYTES_8_BITS;
memval |= QSPI_SETUP0_READ_QUAD;
slave->mode_rx = SPI_RX_QUAD;
break;
case SPI_RX_DUAL:
memval |= QSPI_CMD_READ_DUAL;
memval |= QSPI_SETUP0_NUM_D_BYTES_8_BITS;
memval |= QSPI_SETUP0_READ_DUAL;
break;
default:
memval |= QSPI_CMD_READ;
memval |= QSPI_SETUP0_NUM_D_BYTES_NO_BITS;
memval |= QSPI_SETUP0_READ_NORMAL;
break;
}
writel(memval, &priv->base->setup0);
}
static int ti_qspi_set_speed(struct udevice *bus, uint max_hz)
{
struct ti_qspi_priv *priv = dev_get_priv(bus);
ti_spi_set_speed(priv, max_hz);
return 0;
}
static int ti_qspi_set_mode(struct udevice *bus, uint mode)
{
struct ti_qspi_priv *priv = dev_get_priv(bus);
return __ti_qspi_set_mode(priv, mode);
}
static int ti_qspi_claim_bus(struct udevice *dev)
{
struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
struct spi_slave *slave = dev_get_parent_priv(dev);
struct ti_qspi_priv *priv;
struct udevice *bus;
bus = dev->parent;
priv = dev_get_priv(bus);
if (slave_plat->cs > priv->num_cs) {
debug("invalid qspi chip select\n");
return -EINVAL;
}
__ti_qspi_setup_memorymap(priv, slave, true);
return __ti_qspi_claim_bus(priv, slave_plat->cs);
}
static int ti_qspi_release_bus(struct udevice *dev)
{
struct spi_slave *slave = dev_get_parent_priv(dev);
struct ti_qspi_priv *priv;
struct udevice *bus;
bus = dev->parent;
priv = dev_get_priv(bus);
__ti_qspi_setup_memorymap(priv, slave, false);
__ti_qspi_release_bus(priv);
return 0;
}
static int ti_qspi_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 ti_qspi_priv *priv;
struct udevice *bus;
bus = dev->parent;
priv = dev_get_priv(bus);
if (slave->cs > priv->num_cs) {
debug("invalid qspi chip select\n");
return -EINVAL;
}
return __ti_qspi_xfer(priv, bitlen, dout, din, flags, slave->cs);
}
static int ti_qspi_probe(struct udevice *bus)
{
struct ti_qspi_priv *priv = dev_get_priv(bus);
priv->fclk = dev_get_driver_data(bus);
return 0;
}
static int ti_qspi_ofdata_to_platdata(struct udevice *bus)
{
struct ti_qspi_priv *priv = dev_get_priv(bus);
const void *blob = gd->fdt_blob;
int node = bus->of_offset;
fdt_addr_t addr;
void *mmap;
priv->base = map_physmem(dev_get_addr(bus), sizeof(struct ti_qspi_regs),
MAP_NOCACHE);
priv->memory_map = map_physmem(dev_get_addr_index(bus, 1), 0,
MAP_NOCACHE);
addr = dev_get_addr_index(bus, 2);
mmap = map_physmem(dev_get_addr_index(bus, 2), 0, MAP_NOCACHE);
priv->ctrl_mod_mmap = (addr == FDT_ADDR_T_NONE) ? NULL : mmap;
priv->max_hz = fdtdec_get_int(blob, node, "spi-max-frequency", -1);
if (priv->max_hz < 0) {
debug("Error: Max frequency missing\n");
return -ENODEV;
}
priv->num_cs = fdtdec_get_int(blob, node, "num-cs", 4);
debug("%s: regs=<0x%x>, max-frequency=%d\n", __func__,
(int)priv->base, priv->max_hz);
return 0;
}
static int ti_qspi_child_pre_probe(struct udevice *dev)
{
struct spi_slave *slave = dev_get_parent_priv(dev);
struct udevice *bus = dev_get_parent(dev);
struct ti_qspi_priv *priv = dev_get_priv(bus);
slave->memory_map = priv->memory_map;
return 0;
}
static const struct dm_spi_ops ti_qspi_ops = {
.claim_bus = ti_qspi_claim_bus,
.release_bus = ti_qspi_release_bus,
.xfer = ti_qspi_xfer,
.set_speed = ti_qspi_set_speed,
.set_mode = ti_qspi_set_mode,
};
static const struct udevice_id ti_qspi_ids[] = {
{ .compatible = "ti,dra7xxx-qspi", .data = QSPI_DRA7XX_FCLK},
{ .compatible = "ti,am4372-qspi", .data = QSPI_FCLK},
{ }
};
U_BOOT_DRIVER(ti_qspi) = {
.name = "ti_qspi",
.id = UCLASS_SPI,
.of_match = ti_qspi_ids,
.ops = &ti_qspi_ops,
.ofdata_to_platdata = ti_qspi_ofdata_to_platdata,
.priv_auto_alloc_size = sizeof(struct ti_qspi_priv),
.probe = ti_qspi_probe,
.child_pre_probe = ti_qspi_child_pre_probe,
};
#endif /* CONFIG_DM_SPI */