// SPDX-License-Identifier: GPL-2.0-or-later
/*
* ASPEED FMC/SPI Memory Controller Driver
*
* Copyright (c) 2015-2022, IBM Corporation.
* Copyright (c) 2020, ASPEED Corporation.
*/
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/spi/spi.h>
#include <linux/spi/spi-mem.h>
#define DEVICE_NAME "spi-aspeed-smc"
/* Type setting Register */
#define CONFIG_REG 0x0
#define CONFIG_TYPE_SPI 0x2
/* CE Control Register */
#define CE_CTRL_REG 0x4
/* CEx Control Register */
#define CE0_CTRL_REG 0x10
#define CTRL_IO_MODE_MASK GENMASK(30, 28)
#define CTRL_IO_SINGLE_DATA 0x0
#define CTRL_IO_DUAL_DATA BIT(29)
#define CTRL_IO_QUAD_DATA BIT(30)
#define CTRL_COMMAND_SHIFT 16
#define CTRL_IO_ADDRESS_4B BIT(13) /* AST2400 SPI only */
#define CTRL_IO_DUMMY_SET(dummy) \
(((((dummy) >> 2) & 0x1) << 14) | (((dummy) & 0x3) << 6))
#define CTRL_FREQ_SEL_SHIFT 8
#define CTRL_FREQ_SEL_MASK GENMASK(11, CTRL_FREQ_SEL_SHIFT)
#define CTRL_CE_STOP_ACTIVE BIT(2)
#define CTRL_IO_MODE_CMD_MASK GENMASK(1, 0)
#define CTRL_IO_MODE_NORMAL 0x0
#define CTRL_IO_MODE_READ 0x1
#define CTRL_IO_MODE_WRITE 0x2
#define CTRL_IO_MODE_USER 0x3
#define CTRL_IO_CMD_MASK 0xf0ff40c3
/* CEx Address Decoding Range Register */
#define CE0_SEGMENT_ADDR_REG 0x30
#define FULL_DUPLEX_RX_DATA 0x1e4
/* CEx Read timing compensation register */
#define CE0_TIMING_COMPENSATION_REG 0x94
enum aspeed_spi_ctl_reg_value {
ASPEED_SPI_BASE,
ASPEED_SPI_READ,
ASPEED_SPI_WRITE,
ASPEED_SPI_MAX,
};
struct aspeed_spi;
struct aspeed_spi_chip {
struct aspeed_spi *aspi;
u32 cs;
void __iomem *ctl;
void __iomem *ahb_base;
u32 ahb_window_size;
u32 ctl_val[ASPEED_SPI_MAX];
u32 clk_freq;
bool force_user_mode;
};
struct aspeed_spi_data {
u32 ctl0;
u32 max_cs;
bool hastype;
u32 mode_bits;
u32 we0;
u32 timing;
u32 hclk_mask;
u32 hdiv_max;
u32 min_window_size;
bool full_duplex;
phys_addr_t (*segment_start)(struct aspeed_spi *aspi, u32 reg);
phys_addr_t (*segment_end)(struct aspeed_spi *aspi, u32 reg);
u32 (*segment_reg)(struct aspeed_spi *aspi, phys_addr_t start,
phys_addr_t end);
int (*adjust_window)(struct aspeed_spi *aspi);
u32 (*get_clk_div)(struct aspeed_spi_chip *chip, u32 hz);
int (*calibrate)(struct aspeed_spi_chip *chip, u32 hdiv,
const u8 *golden_buf, u8 *test_buf);
};
#define ASPEED_SPI_MAX_NUM_CS 5
struct aspeed_spi {
const struct aspeed_spi_data *data;
void __iomem *regs;
phys_addr_t ahb_base_phy;
u32 ahb_window_size;
u32 num_cs;
struct device *dev;
struct clk *clk;
u32 clk_freq;
u8 cs_change;
struct aspeed_spi_chip chips[ASPEED_SPI_MAX_NUM_CS];
};
static u32 aspeed_spi_get_io_mode(const struct spi_mem_op *op)
{
switch (op->data.buswidth) {
case 1:
return CTRL_IO_SINGLE_DATA;
case 2:
return CTRL_IO_DUAL_DATA;
case 4:
return CTRL_IO_QUAD_DATA;
default:
return CTRL_IO_SINGLE_DATA;
}
}
static void aspeed_spi_set_io_mode(struct aspeed_spi_chip *chip, u32 io_mode)
{
u32 ctl;
if (io_mode > 0) {
ctl = readl(chip->ctl) & ~CTRL_IO_MODE_MASK;
ctl |= io_mode;
writel(ctl, chip->ctl);
}
}
static void aspeed_spi_start_user(struct aspeed_spi_chip *chip)
{
u32 ctl = chip->ctl_val[ASPEED_SPI_BASE];
ctl |= CTRL_IO_MODE_USER | CTRL_CE_STOP_ACTIVE;
writel(ctl, chip->ctl);
ctl &= ~CTRL_CE_STOP_ACTIVE;
writel(ctl, chip->ctl);
}
static void aspeed_spi_stop_user(struct aspeed_spi_chip *chip)
{
u32 ctl = chip->ctl_val[ASPEED_SPI_READ] |
CTRL_IO_MODE_USER | CTRL_CE_STOP_ACTIVE;
writel(ctl, chip->ctl);
/* Restore defaults */
writel(chip->ctl_val[ASPEED_SPI_READ], chip->ctl);
}
static int aspeed_spi_read_from_ahb(void *buf, void __iomem *src, size_t len)
{
size_t offset = 0;
if (IS_ALIGNED((uintptr_t)src, sizeof(uintptr_t)) &&
IS_ALIGNED((uintptr_t)buf, sizeof(uintptr_t))) {
ioread32_rep(src, buf, len >> 2);
offset = len & ~0x3;
len -= offset;
}
ioread8_rep(src, (u8 *)buf + offset, len);
return 0;
}
static int aspeed_spi_write_to_ahb(void __iomem *dst, const void *buf, size_t len)
{
size_t offset = 0;
if (IS_ALIGNED((uintptr_t)dst, sizeof(uintptr_t)) &&
IS_ALIGNED((uintptr_t)buf, sizeof(uintptr_t))) {
iowrite32_rep(dst, buf, len >> 2);
offset = len & ~0x3;
len -= offset;
}
iowrite8_rep(dst, (const u8 *)buf + offset, len);
return 0;
}
static int aspeed_spi_send_cmd_addr(struct aspeed_spi_chip *chip, u8 addr_nbytes,
u64 offset, u32 opcode)
{
__be32 temp;
u32 cmdaddr;
switch (addr_nbytes) {
case 3:
cmdaddr = offset & 0xFFFFFF;
cmdaddr |= opcode << 24;
temp = cpu_to_be32(cmdaddr);
aspeed_spi_write_to_ahb(chip->ahb_base, &temp, 4);
break;
case 4:
temp = cpu_to_be32(offset);
aspeed_spi_write_to_ahb(chip->ahb_base, &opcode, 1);
aspeed_spi_write_to_ahb(chip->ahb_base, &temp, 4);
break;
default:
WARN_ONCE(1, "Unexpected address width %u", addr_nbytes);
return -EOPNOTSUPP;
}
return 0;
}
static int aspeed_spi_read_reg(struct aspeed_spi_chip *chip,
const struct spi_mem_op *op)
{
aspeed_spi_start_user(chip);
aspeed_spi_write_to_ahb(chip->ahb_base, &op->cmd.opcode, 1);
aspeed_spi_read_from_ahb(op->data.buf.in,
chip->ahb_base, op->data.nbytes);
aspeed_spi_stop_user(chip);
return 0;
}
static int aspeed_spi_write_reg(struct aspeed_spi_chip *chip,
const struct spi_mem_op *op)
{
aspeed_spi_start_user(chip);
aspeed_spi_write_to_ahb(chip->ahb_base, &op->cmd.opcode, 1);
aspeed_spi_write_to_ahb(chip->ahb_base, op->data.buf.out,
op->data.nbytes);
aspeed_spi_stop_user(chip);
return 0;
}
static ssize_t aspeed_spi_read_user(struct aspeed_spi_chip *chip,
const struct spi_mem_op *op,
u64 offset, size_t len, void *buf)
{
int io_mode = aspeed_spi_get_io_mode(op);
u8 dummy = 0xFF;
int i;
int ret;
aspeed_spi_start_user(chip);
ret = aspeed_spi_send_cmd_addr(chip, op->addr.nbytes, offset, op->cmd.opcode);
if (ret < 0)
goto stop_user;
if (op->dummy.buswidth && op->dummy.nbytes) {
for (i = 0; i < op->dummy.nbytes / op->dummy.buswidth; i++)
aspeed_spi_write_to_ahb(chip->ahb_base, &dummy, sizeof(dummy));
}
aspeed_spi_set_io_mode(chip, io_mode);
aspeed_spi_read_from_ahb(buf, chip->ahb_base, len);
stop_user:
aspeed_spi_stop_user(chip);
return ret;
}
static ssize_t aspeed_spi_write_user(struct aspeed_spi_chip *chip,
const struct spi_mem_op *op)
{
int ret;
int io_mode = aspeed_spi_get_io_mode(op);
aspeed_spi_start_user(chip);
ret = aspeed_spi_send_cmd_addr(chip, op->addr.nbytes, op->addr.val, op->cmd.opcode);
if (ret < 0)
goto stop_user;
aspeed_spi_set_io_mode(chip, io_mode);
aspeed_spi_write_to_ahb(chip->ahb_base, op->data.buf.out, op->data.nbytes);
stop_user:
aspeed_spi_stop_user(chip);
return ret;
}
/* support for 1-1-1, 1-1-2 or 1-1-4 */
static bool aspeed_spi_supports_mem_op(struct spi_mem *mem,
const struct spi_mem_op *op)
{
if (op->cmd.buswidth > 1)
return false;
if (op->addr.nbytes != 0) {
if (op->addr.buswidth > 1)
return false;
if (op->addr.nbytes < 3 || op->addr.nbytes > 4)
return false;
}
if (op->dummy.nbytes != 0) {
if (op->dummy.buswidth > 1 || op->dummy.nbytes > 7)
return false;
}
if (op->data.nbytes != 0 && op->data.buswidth > 4)
return false;
return spi_mem_default_supports_op(mem, op);
}
static const struct aspeed_spi_data ast2400_spi_data;
static int do_aspeed_spi_exec_mem_op(struct spi_mem *mem,
const struct spi_mem_op *op)
{
struct aspeed_spi *aspi = spi_controller_get_devdata(mem->spi->controller);
struct aspeed_spi_chip *chip = &aspi->chips[spi_get_chipselect(mem->spi, 0)];
u32 addr_mode, addr_mode_backup;
u32 ctl_val;
int ret = 0;
addr_mode = readl(aspi->regs + CE_CTRL_REG);
addr_mode_backup = addr_mode;
ctl_val = chip->ctl_val[ASPEED_SPI_BASE];
ctl_val &= ~CTRL_IO_CMD_MASK;
ctl_val |= op->cmd.opcode << CTRL_COMMAND_SHIFT;
/* 4BYTE address mode */
if (op->addr.nbytes) {
if (op->addr.nbytes == 4)
addr_mode |= (0x11 << chip->cs);
else
addr_mode &= ~(0x11 << chip->cs);
if (op->addr.nbytes == 4 && chip->aspi->data == &ast2400_spi_data)
ctl_val |= CTRL_IO_ADDRESS_4B;
}
if (op->dummy.nbytes)
ctl_val |= CTRL_IO_DUMMY_SET(op->dummy.nbytes / op->dummy.buswidth);
if (op->data.nbytes)
ctl_val |= aspeed_spi_get_io_mode(op);
if (op->data.dir == SPI_MEM_DATA_OUT)
ctl_val |= CTRL_IO_MODE_WRITE;
else
ctl_val |= CTRL_IO_MODE_READ;
if (addr_mode != addr_mode_backup)
writel(addr_mode, aspi->regs + CE_CTRL_REG);
writel(ctl_val, chip->ctl);
if (op->data.dir == SPI_MEM_DATA_IN) {
if (!op->addr.nbytes)
ret = aspeed_spi_read_reg(chip, op);
else
ret = aspeed_spi_read_user(chip, op, op->addr.val,
op->data.nbytes, op->data.buf.in);
} else {
if (!op->addr.nbytes)
ret = aspeed_spi_write_reg(chip, op);
else
ret = aspeed_spi_write_user(chip, op);
}
/* Restore defaults */
if (addr_mode != addr_mode_backup)
writel(addr_mode_backup, aspi->regs + CE_CTRL_REG);
writel(chip->ctl_val[ASPEED_SPI_READ], chip->ctl);
return ret;
}
static int aspeed_spi_exec_mem_op(struct spi_mem *mem,
const struct spi_mem_op *op)
{
int ret;
ret = do_aspeed_spi_exec_mem_op(mem, op);
if (ret)
dev_err(&mem->spi->dev, "operation failed: %d\n", ret);
return ret;
}
static const char *aspeed_spi_get_name(struct spi_mem *mem)
{
struct aspeed_spi *aspi = spi_controller_get_devdata(mem->spi->controller);
struct device *dev = aspi->dev;
return devm_kasprintf(dev, GFP_KERNEL, "%s.%d", dev_name(dev),
spi_get_chipselect(mem->spi, 0));
}
static int aspeed_spi_set_window(struct aspeed_spi *aspi)
{
struct device *dev = aspi->dev;
off_t offset = 0;
phys_addr_t start;
phys_addr_t end;
void __iomem *seg_reg_base = aspi->regs + CE0_SEGMENT_ADDR_REG;
void __iomem *seg_reg;
u32 seg_val_backup;
u32 seg_val;
u32 cs;
size_t window_size;
for (cs = 0; cs < aspi->data->max_cs; cs++) {
if (aspi->chips[cs].ahb_base) {
devm_iounmap(dev, aspi->chips[cs].ahb_base);
aspi->chips[cs].ahb_base = NULL;
}
}
for (cs = 0; cs < aspi->data->max_cs; cs++) {
seg_reg = seg_reg_base + cs * 4;
seg_val_backup = readl(seg_reg);
start = aspi->ahb_base_phy + offset;
window_size = aspi->chips[cs].ahb_window_size;
end = start + window_size;
seg_val = aspi->data->segment_reg(aspi, start, end);
writel(seg_val, seg_reg);
/*
* Restore initial value if something goes wrong or the segment
* register is written protected.
*/
if (seg_val != readl(seg_reg)) {
dev_warn(dev, "CE%d expected window [ 0x%.9llx - 0x%.9llx ] %zdMB\n",
cs, (u64)start, (u64)end - 1, window_size >> 20);
writel(seg_val_backup, seg_reg);
window_size = aspi->data->segment_end(aspi, seg_val_backup) -
aspi->data->segment_start(aspi, seg_val_backup);
aspi->chips[cs].ahb_window_size = window_size;
end = start + window_size;
}
if (window_size != 0)
dev_dbg(dev, "CE%d window [ 0x%.9llx - 0x%.9llx ] %zdMB\n",
cs, (u64)start, (u64)end - 1, window_size >> 20);
else
dev_dbg(dev, "CE%d window closed\n", cs);
offset += window_size;
if (offset > aspi->ahb_window_size) {
dev_err(dev, "CE%d offset value 0x%llx is too large.\n",
cs, (u64)offset);
return -ENOSPC;
}
/*
* No need to map the address deocding range when
* - window size is 0.
* - the CS is unused.
*/
if (window_size == 0 || cs >= aspi->num_cs)
continue;
aspi->chips[cs].ahb_base =
devm_ioremap(aspi->dev, start, window_size);
if (!aspi->chips[cs].ahb_base) {
dev_err(aspi->dev,
"Fail to remap window [0x%.9llx - 0x%.9llx]\n",
(u64)start, (u64)end - 1);
return -ENOMEM;
}
}
return 0;
}
static const struct aspeed_spi_data ast2500_spi_data;
static const struct aspeed_spi_data ast2600_spi_data;
static const struct aspeed_spi_data ast2600_fmc_data;
static int aspeed_spi_chip_set_default_window(struct aspeed_spi *aspi)
{
u32 cs;
/* No segment registers for the AST2400 SPI controller */
if (aspi->data == &ast2400_spi_data) {
aspi->chips[0].ahb_base = devm_ioremap(aspi->dev,
aspi->ahb_base_phy,
aspi->ahb_window_size);
aspi->chips[0].ahb_window_size = aspi->ahb_window_size;
return 0;
}
/* Assign the minimum window size to each CS */
for (cs = 0; cs < aspi->num_cs; cs++) {
aspi->chips[cs].ahb_window_size = aspi->data->min_window_size;
dev_dbg(aspi->dev, "CE%d default window [ 0x%.9llx - 0x%.9llx ]",
cs, (u64)(aspi->ahb_base_phy + aspi->data->min_window_size * cs),
(u64)(aspi->ahb_base_phy + aspi->data->min_window_size * cs - 1));
}
/* Close unused CS */
for (cs = aspi->num_cs; cs < aspi->data->max_cs; cs++)
aspi->chips[cs].ahb_window_size = 0;
if (aspi->data->adjust_window)
aspi->data->adjust_window(aspi);
return aspeed_spi_set_window(aspi);
}
/*
* As the flash size grows up, we need to trim some decoding
* size if needed for the sake of conforming the maximum
* decoding size. We trim the decoding size from the rear CS
* to avoid affecting the default boot up sequence, usually,
* from CS0. Notice, if a CS decoding size is trimmed,
* command mode may not work perfectly on that CS, but it only
* affect performance and the debug function.
*/
static int aspeed_spi_trim_window_size(struct aspeed_spi *aspi)
{
struct aspeed_spi_chip *chips = aspi->chips;
size_t total_sz;
int cs = aspi->data->max_cs - 1;
u32 i;
bool trimmed = false;
do {
total_sz = 0;
for (i = 0; i < aspi->data->max_cs; i++)
total_sz += chips[i].ahb_window_size;
if (cs < 0)
return -ENOMEM;
if (chips[cs].ahb_window_size <= aspi->data->min_window_size) {
cs--;
continue;
}
if (total_sz > aspi->ahb_window_size) {
chips[cs].ahb_window_size -=
aspi->data->min_window_size;
total_sz -= aspi->data->min_window_size;
/*
* If the ahb window size is ever trimmed, only user
* mode can be adopted to access the whole flash.
*/
chips[cs].force_user_mode = true;
trimmed = true;
}
} while (total_sz > aspi->ahb_window_size);
if (trimmed) {
dev_warn(aspi->dev, "Window size after trimming:\n");
for (cs = 0; cs < aspi->data->max_cs; cs++) {
dev_warn(aspi->dev, "CE%d: 0x%08x\n",
cs, chips[cs].ahb_window_size);
}
}
return 0;
}
static int aspeed_adjust_window_ast2400(struct aspeed_spi *aspi)
{
int ret;
int cs;
struct aspeed_spi_chip *chips = aspi->chips;
/* Close unused CS. */
for (cs = aspi->num_cs; cs < aspi->data->max_cs; cs++)
chips[cs].ahb_window_size = 0;
ret = aspeed_spi_trim_window_size(aspi);
if (ret != 0)
return ret;
return 0;
}
/*
* For AST2500, the minimum address decoding size for each CS
* is 8MB. This address decoding size is mandatory for each
* CS no matter whether it will be used. This is a HW limitation.
*/
static int aspeed_adjust_window_ast2500(struct aspeed_spi *aspi)
{
int ret;
int cs, i;
u32 cum_size, rem_size;
struct aspeed_spi_chip *chips = aspi->chips;
/* Assign min_window_sz to unused CS. */
for (cs = aspi->num_cs; cs < aspi->data->max_cs; cs++) {
if (chips[cs].ahb_window_size < aspi->data->min_window_size)
chips[cs].ahb_window_size =
aspi->data->min_window_size;
}
/*
* If command mode or normal mode is used by dirmap read, the start
* address of a window should be multiple of its related flash size.
* Namely, the total windows size from flash 0 to flash N should
* be multiple of the size of flash (N + 1).
*/
for (cs = aspi->num_cs - 1; cs >= 0; cs--) {
cum_size = 0;
for (i = 0; i < cs; i++)
cum_size += chips[i].ahb_window_size;
rem_size = cum_size % chips[cs].ahb_window_size;
if (chips[cs].ahb_window_size != 0 && rem_size != 0)
chips[0].ahb_window_size +=
chips[cs].ahb_window_size - rem_size;
}
ret = aspeed_spi_trim_window_size(aspi);
if (ret != 0)
return ret;
/* The total window size of AST2500 SPI1 CS0 and CS1 must be 128MB */
if (aspi->data == &ast2500_spi_data)
chips[1].ahb_window_size =
0x08000000 - chips[0].ahb_window_size;
return 0;
}
static int aspeed_adjust_window_ast2600(struct aspeed_spi *aspi)
{
int ret;
int cs, i;
u32 cum_size, rem_size;
struct aspeed_spi_chip *chips = aspi->chips;
/* Close unused CS. */
for (cs = aspi->num_cs; cs < aspi->data->max_cs; cs++)
chips[cs].ahb_window_size = 0;
/*
* If command mode or normal mode is used by dirmap read, the start
* address of a window should be multiple of its related flash size.
* Namely, the total windows size from flash 0 to flash N should
* be multiple of the size of flash (N + 1).
*/
for (cs = aspi->num_cs - 1; cs >= 0; cs--) {
cum_size = 0;
for (i = 0; i < cs; i++)
cum_size += chips[i].ahb_window_size;
rem_size = cum_size % chips[cs].ahb_window_size;
if (chips[cs].ahb_window_size != 0 && rem_size != 0)
chips[0].ahb_window_size +=
chips[cs].ahb_window_size - rem_size;
}
ret = aspeed_spi_trim_window_size(aspi);
if (ret != 0)
return ret;
return 0;
}
/*
* Yet to be done when possible :
* - Align mappings on flash size (we don't have the info)
* - ioremap each window, not strictly necessary since the overall window
* is correct.
*/
static int aspeed_spi_chip_adjust_window(struct aspeed_spi_chip *chip,
u32 local_offset, u32 size)
{
struct aspeed_spi *aspi = chip->aspi;
int ret;
/* No segment registers for the AST2400 SPI controller */
if (aspi->data == &ast2400_spi_data)
return 0;
/* Adjust this chip window */
aspi->chips[chip->cs].ahb_window_size = size;
/* Adjust the overall windows size regarding each platform */
if (aspi->data->adjust_window)
aspi->data->adjust_window(aspi);
ret = aspeed_spi_set_window(aspi);
if (ret)
return ret;
return 0;
}
static int aspeed_spi_do_calibration(struct aspeed_spi_chip *chip);
static int aspeed_spi_dirmap_create(struct spi_mem_dirmap_desc *desc)
{
struct aspeed_spi *aspi = spi_controller_get_devdata(desc->mem->spi->controller);
struct aspeed_spi_chip *chip = &aspi->chips[spi_get_chipselect(desc->mem->spi, 0)];
struct spi_mem_op *op = desc->info.op_tmpl;
u32 ctl_val;
int ret = 0;
dev_dbg(aspi->dev,
"CE%d %s dirmap [ 0x%.8llx - 0x%.8llx ] OP %#x mode:%d.%d.%d.%d naddr:%#x ndummies:%#x\n",
chip->cs, op->data.dir == SPI_MEM_DATA_IN ? "read" : "write",
desc->info.offset, desc->info.offset + desc->info.length,
op->cmd.opcode, op->cmd.buswidth, op->addr.buswidth,
op->dummy.buswidth, op->data.buswidth,
op->addr.nbytes, op->dummy.nbytes);
chip->clk_freq = desc->mem->spi->max_speed_hz;
/* Only for reads */
if (op->data.dir != SPI_MEM_DATA_IN)
return -EOPNOTSUPP;
aspeed_spi_chip_adjust_window(chip, desc->info.offset, desc->info.length);
if (desc->info.length > chip->ahb_window_size)
dev_warn(aspi->dev, "CE%d window (%dMB) too small for mapping",
chip->cs, chip->ahb_window_size >> 20);
/* Define the default IO read settings */
ctl_val = readl(chip->ctl) & ~CTRL_IO_CMD_MASK;
ctl_val |= aspeed_spi_get_io_mode(op) |
op->cmd.opcode << CTRL_COMMAND_SHIFT |
CTRL_IO_MODE_READ;
if (op->dummy.nbytes)
ctl_val |= CTRL_IO_DUMMY_SET(op->dummy.nbytes / op->dummy.buswidth);
/* Tune 4BYTE address mode */
if (op->addr.nbytes) {
u32 addr_mode = readl(aspi->regs + CE_CTRL_REG);
if (op->addr.nbytes == 4)
addr_mode |= (0x11 << chip->cs);
else
addr_mode &= ~(0x11 << chip->cs);
writel(addr_mode, aspi->regs + CE_CTRL_REG);
/* AST2400 SPI controller sets 4BYTE address mode in
* CE0 Control Register
*/
if (op->addr.nbytes == 4 && chip->aspi->data == &ast2400_spi_data)
ctl_val |= CTRL_IO_ADDRESS_4B;
}
/* READ mode is the controller default setting */
chip->ctl_val[ASPEED_SPI_READ] = ctl_val;
writel(chip->ctl_val[ASPEED_SPI_READ], chip->ctl);
ret = aspeed_spi_do_calibration(chip);
dev_info(aspi->dev, "CE%d read buswidth:%d [0x%08x]\n",
chip->cs, op->data.buswidth, chip->ctl_val[ASPEED_SPI_READ]);
return ret;
}
static ssize_t aspeed_spi_dirmap_read(struct spi_mem_dirmap_desc *desc,
u64 offset, size_t len, void *buf)
{
struct aspeed_spi *aspi = spi_controller_get_devdata(desc->mem->spi->controller);
struct aspeed_spi_chip *chip = &aspi->chips[spi_get_chipselect(desc->mem->spi, 0)];
/* Switch to USER command mode if mapping window is too small */
if (chip->ahb_window_size < offset + len || chip->force_user_mode) {
int ret;
ret = aspeed_spi_read_user(chip, desc->info.op_tmpl, offset, len, buf);
if (ret < 0)
return ret;
} else {
memcpy_fromio(buf, chip->ahb_base + offset, len);
}
return len;
}
static const struct spi_controller_mem_ops aspeed_spi_mem_ops = {
.supports_op = aspeed_spi_supports_mem_op,
.exec_op = aspeed_spi_exec_mem_op,
.get_name = aspeed_spi_get_name,
.dirmap_create = aspeed_spi_dirmap_create,
.dirmap_read = aspeed_spi_dirmap_read,
};
static void aspeed_spi_chip_set_type(struct aspeed_spi *aspi, unsigned int cs, int type)
{
u32 reg;
reg = readl(aspi->regs + CONFIG_REG);
reg &= ~(0x3 << (cs * 2));
reg |= type << (cs * 2);
writel(reg, aspi->regs + CONFIG_REG);
}
static void aspeed_spi_chip_enable(struct aspeed_spi *aspi, unsigned int cs, bool enable)
{
u32 we_bit = BIT(aspi->data->we0 + cs);
u32 reg = readl(aspi->regs + CONFIG_REG);
if (enable)
reg |= we_bit;
else
reg &= ~we_bit;
writel(reg, aspi->regs + CONFIG_REG);
}
static int aspeed_spi_setup(struct spi_device *spi)
{
struct aspeed_spi *aspi = spi_controller_get_devdata(spi->controller);
const struct aspeed_spi_data *data = aspi->data;
unsigned int cs = spi_get_chipselect(spi, 0);
struct aspeed_spi_chip *chip = &aspi->chips[cs];
chip->aspi = aspi;
chip->cs = cs;
chip->ctl = aspi->regs + data->ctl0 + cs * 4;
/* The driver only supports SPI type flash */
if (data->hastype)
aspeed_spi_chip_set_type(aspi, cs, CONFIG_TYPE_SPI);
aspeed_spi_chip_enable(aspi, cs, true);
chip->ctl_val[ASPEED_SPI_BASE] = CTRL_CE_STOP_ACTIVE | CTRL_IO_MODE_USER;
dev_dbg(aspi->dev, "CE%d setup done\n", cs);
return 0;
}
static void aspeed_spi_cleanup(struct spi_device *spi)
{
struct aspeed_spi *aspi = spi_controller_get_devdata(spi->controller);
unsigned int cs = spi_get_chipselect(spi, 0);
aspeed_spi_chip_enable(aspi, cs, false);
dev_dbg(aspi->dev, "CE%d cleanup done\n", cs);
}
static void aspeed_spi_enable(struct aspeed_spi *aspi, bool enable)
{
int cs;
for (cs = 0; cs < aspi->data->max_cs; cs++)
aspeed_spi_chip_enable(aspi, cs, enable);
}
static int aspeed_spi_user_prepare_msg(struct spi_controller *ctlr,
struct spi_message *msg)
{
struct aspeed_spi *aspi =
(struct aspeed_spi *)spi_controller_get_devdata(ctlr);
const struct aspeed_spi_data *data = aspi->data;
struct spi_device *spi = msg->spi;
u32 cs = spi_get_chipselect(spi, 0);
struct aspeed_spi_chip *chip = &aspi->chips[cs];
u32 ctrl_val;
u32 clk_div = data->get_clk_div(chip, spi->max_speed_hz);
ctrl_val = chip->ctl_val[ASPEED_SPI_BASE];
ctrl_val &= ~CTRL_IO_MODE_MASK & data->hclk_mask;
ctrl_val |= clk_div;
chip->ctl_val[ASPEED_SPI_BASE] = ctrl_val;
if (aspi->cs_change == 0)
aspeed_spi_start_user(chip);
return 0;
}
static int aspeed_spi_user_unprepare_msg(struct spi_controller *ctlr,
struct spi_message *msg)
{
struct aspeed_spi *aspi =
(struct aspeed_spi *)spi_controller_get_devdata(ctlr);
struct spi_device *spi = msg->spi;
u32 cs = spi_get_chipselect(spi, 0);
struct aspeed_spi_chip *chip = &aspi->chips[cs];
if (aspi->cs_change == 0)
aspeed_spi_stop_user(chip);
return 0;
}
static void aspeed_spi_user_transfer_tx(struct aspeed_spi *aspi,
struct spi_device *spi,
const u8 *tx_buf, u8 *rx_buf,
void __iomem *dst, u32 len)
{
const struct aspeed_spi_data *data = aspi->data;
bool full_duplex_transfer = data->full_duplex && tx_buf == rx_buf;
u32 i;
if (full_duplex_transfer &&
!!(spi->mode & (SPI_TX_DUAL | SPI_TX_QUAD |
SPI_RX_DUAL | SPI_RX_QUAD))) {
dev_err(aspi->dev,
"full duplex is only supported for single IO mode\n");
return;
}
for (i = 0; i < len; i++) {
writeb(tx_buf[i], dst);
if (full_duplex_transfer)
rx_buf[i] = readb(aspi->regs + FULL_DUPLEX_RX_DATA);
}
}
static int aspeed_spi_user_transfer(struct spi_controller *ctlr,
struct spi_device *spi,
struct spi_transfer *xfer)
{
struct aspeed_spi *aspi =
(struct aspeed_spi *)spi_controller_get_devdata(ctlr);
u32 cs = spi_get_chipselect(spi, 0);
struct aspeed_spi_chip *chip = &aspi->chips[cs];
void __iomem *ahb_base = aspi->chips[cs].ahb_base;
const u8 *tx_buf = xfer->tx_buf;
u8 *rx_buf = xfer->rx_buf;
dev_dbg(aspi->dev,
"[cs%d] xfer: width %d, len %u, tx %p, rx %p\n",
cs, xfer->bits_per_word, xfer->len,
tx_buf, rx_buf);
if (tx_buf) {
if (spi->mode & SPI_TX_DUAL)
aspeed_spi_set_io_mode(chip, CTRL_IO_DUAL_DATA);
else if (spi->mode & SPI_TX_QUAD)
aspeed_spi_set_io_mode(chip, CTRL_IO_QUAD_DATA);
aspeed_spi_user_transfer_tx(aspi, spi, tx_buf, rx_buf,
ahb_base, xfer->len);
}
if (rx_buf && rx_buf != tx_buf) {
if (spi->mode & SPI_RX_DUAL)
aspeed_spi_set_io_mode(chip, CTRL_IO_DUAL_DATA);
else if (spi->mode & SPI_RX_QUAD)
aspeed_spi_set_io_mode(chip, CTRL_IO_QUAD_DATA);
ioread8_rep(ahb_base, rx_buf, xfer->len);
}
xfer->error = 0;
aspi->cs_change = xfer->cs_change;
return 0;
}
static int aspeed_spi_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
const struct aspeed_spi_data *data;
struct spi_controller *ctlr;
struct aspeed_spi *aspi;
struct resource *res;
int ret;
data = of_device_get_match_data(&pdev->dev);
if (!data)
return -ENODEV;
ctlr = devm_spi_alloc_host(dev, sizeof(*aspi));
if (!ctlr)
return -ENOMEM;
aspi = spi_controller_get_devdata(ctlr);
platform_set_drvdata(pdev, ctlr);
aspi->data = data;
aspi->dev = dev;
aspi->regs = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(aspi->regs))
return PTR_ERR(aspi->regs);
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!res) {
dev_err(dev, "missing AHB memory\n");
return -EINVAL;
}
aspi->ahb_window_size = resource_size(res);
aspi->ahb_base_phy = res->start;
aspi->clk = devm_clk_get_enabled(&pdev->dev, NULL);
if (IS_ERR(aspi->clk)) {
dev_err(dev, "missing clock\n");
return PTR_ERR(aspi->clk);
}
aspi->clk_freq = clk_get_rate(aspi->clk);
if (!aspi->clk_freq) {
dev_err(dev, "invalid clock\n");
return -EINVAL;
}
/* IRQ is for DMA, which the driver doesn't support yet */
ctlr->mode_bits = SPI_RX_DUAL | SPI_TX_DUAL | data->mode_bits;
ctlr->bus_num = pdev->id;
ctlr->mem_ops = &aspeed_spi_mem_ops;
ctlr->setup = aspeed_spi_setup;
ctlr->cleanup = aspeed_spi_cleanup;
ctlr->num_chipselect = of_get_available_child_count(dev->of_node);
ctlr->prepare_message = aspeed_spi_user_prepare_msg;
ctlr->unprepare_message = aspeed_spi_user_unprepare_msg;
ctlr->transfer_one = aspeed_spi_user_transfer;
aspi->num_cs = ctlr->num_chipselect;
ret = aspeed_spi_chip_set_default_window(aspi);
if (ret) {
dev_err(&pdev->dev, "fail to set default window\n");
return ret;
}
ret = spi_register_controller(ctlr);
if (ret)
dev_err(&pdev->dev, "spi_register_controller failed\n");
return ret;
}
static void aspeed_spi_remove(struct platform_device *pdev)
{
struct spi_controller *ctlr = platform_get_drvdata(pdev);
struct aspeed_spi *aspi = spi_controller_get_devdata(ctlr);
spi_unregister_controller(ctlr);
aspeed_spi_enable(aspi, false);
}
/*
* AHB mappings
*/
/*
* The Segment Registers of the AST2400 and AST2500 use a 8MB unit.
* The address range is encoded with absolute addresses in the overall
* mapping window.
*/
static phys_addr_t aspeed_spi_segment_start(struct aspeed_spi *aspi, u32 reg)
{
return ((reg >> 16) & 0xFF) << 23;
}
static phys_addr_t aspeed_spi_segment_end(struct aspeed_spi *aspi, u32 reg)
{
return ((reg >> 24) & 0xFF) << 23;
}
static u32 aspeed_spi_segment_reg(struct aspeed_spi *aspi,
phys_addr_t start, phys_addr_t end)
{
return (((start >> 23) & 0xFF) << 16) | (((end >> 23) & 0xFF) << 24);
}
/*
* The Segment Registers of the AST2600 use a 1MB unit. The address
* range is encoded with offsets in the overall mapping window.
*/
#define AST2600_SEG_ADDR_MASK 0x0ff00000
static phys_addr_t aspeed_spi_segment_ast2600_start(struct aspeed_spi *aspi,
u32 reg)
{
u32 start_offset = (reg << 16) & AST2600_SEG_ADDR_MASK;
return aspi->ahb_base_phy + start_offset;
}
static phys_addr_t aspeed_spi_segment_ast2600_end(struct aspeed_spi *aspi,
u32 reg)
{
u32 end_offset = reg & AST2600_SEG_ADDR_MASK;
/* segment is disabled */
if (!end_offset)
return aspi->ahb_base_phy;
return aspi->ahb_base_phy + end_offset + 0x100000;
}
static u32 aspeed_spi_segment_ast2600_reg(struct aspeed_spi *aspi,
phys_addr_t start, phys_addr_t end)
{
/* disable zero size segments */
if (start == end)
return 0;
return ((start & AST2600_SEG_ADDR_MASK) >> 16) |
((end - 1) & AST2600_SEG_ADDR_MASK);
}
/* The Segment Registers of the AST2700 use a 64KB unit. */
#define AST2700_SEG_ADDR_MASK 0x7fff0000
static phys_addr_t aspeed_spi_segment_ast2700_start(struct aspeed_spi *aspi,
u32 reg)
{
u64 start_offset = (reg << 16) & AST2700_SEG_ADDR_MASK;
if (!start_offset)
return aspi->ahb_base_phy;
return aspi->ahb_base_phy + start_offset;
}
static phys_addr_t aspeed_spi_segment_ast2700_end(struct aspeed_spi *aspi,
u32 reg)
{
u64 end_offset = reg & AST2700_SEG_ADDR_MASK;
if (!end_offset)
return aspi->ahb_base_phy;
return aspi->ahb_base_phy + end_offset;
}
static u32 aspeed_spi_segment_ast2700_reg(struct aspeed_spi *aspi,
phys_addr_t start, phys_addr_t end)
{
if (start == end)
return 0;
return (u32)(((start & AST2700_SEG_ADDR_MASK) >> 16) |
(end & AST2700_SEG_ADDR_MASK));
}
/*
* Read timing compensation sequences
*/
#define CALIBRATE_BUF_SIZE SZ_16K
static bool aspeed_spi_check_reads(struct aspeed_spi_chip *chip,
const u8 *golden_buf, u8 *test_buf)
{
int i;
for (i = 0; i < 10; i++) {
memcpy_fromio(test_buf, chip->ahb_base, CALIBRATE_BUF_SIZE);
if (memcmp(test_buf, golden_buf, CALIBRATE_BUF_SIZE) != 0) {
#if defined(VERBOSE_DEBUG)
print_hex_dump_bytes(DEVICE_NAME " fail: ", DUMP_PREFIX_NONE,
test_buf, 0x100);
#endif
return false;
}
}
return true;
}
#define FREAD_TPASS(i) (((i) / 2) | (((i) & 1) ? 0 : 8))
/*
* The timing register is shared by all devices. Only update for CE0.
*/
static int aspeed_spi_calibrate(struct aspeed_spi_chip *chip, u32 hdiv,
const u8 *golden_buf, u8 *test_buf)
{
struct aspeed_spi *aspi = chip->aspi;
const struct aspeed_spi_data *data = aspi->data;
int i;
int good_pass = -1, pass_count = 0;
u32 shift = (hdiv - 1) << 2;
u32 mask = ~(0xfu << shift);
u32 fread_timing_val = 0;
/* Try HCLK delay 0..5, each one with/without delay and look for a
* good pair.
*/
for (i = 0; i < 12; i++) {
bool pass;
if (chip->cs == 0) {
fread_timing_val &= mask;
fread_timing_val |= FREAD_TPASS(i) << shift;
writel(fread_timing_val, aspi->regs + data->timing);
}
pass = aspeed_spi_check_reads(chip, golden_buf, test_buf);
dev_dbg(aspi->dev,
" * [%08x] %d HCLK delay, %dns DI delay : %s",
fread_timing_val, i / 2, (i & 1) ? 0 : 4,
pass ? "PASS" : "FAIL");
if (pass) {
pass_count++;
if (pass_count == 3) {
good_pass = i - 1;
break;
}
} else {
pass_count = 0;
}
}
/* No good setting for this frequency */
if (good_pass < 0)
return -1;
/* We have at least one pass of margin, let's use first pass */
if (chip->cs == 0) {
fread_timing_val &= mask;
fread_timing_val |= FREAD_TPASS(good_pass) << shift;
writel(fread_timing_val, aspi->regs + data->timing);
}
dev_dbg(aspi->dev, " * -> good is pass %d [0x%08x]",
good_pass, fread_timing_val);
return 0;
}
static bool aspeed_spi_check_calib_data(const u8 *test_buf, u32 size)
{
const u32 *tb32 = (const u32 *)test_buf;
u32 i, cnt = 0;
/* We check if we have enough words that are neither all 0
* nor all 1's so the calibration can be considered valid.
*
* I use an arbitrary threshold for now of 64
*/
size >>= 2;
for (i = 0; i < size; i++) {
if (tb32[i] != 0 && tb32[i] != 0xffffffff)
cnt++;
}
return cnt >= 64;
}
static const u32 aspeed_spi_hclk_divs[] = {
/* HCLK, HCLK/2, HCLK/3, HCLK/4, HCLK/5, ..., HCLK/16 */
0xf, 0x7, 0xe, 0x6, 0xd,
0x5, 0xc, 0x4, 0xb, 0x3,
0xa, 0x2, 0x9, 0x1, 0x8,
0x0
};
#define ASPEED_SPI_HCLK_DIV(i) \
(aspeed_spi_hclk_divs[(i) - 1] << CTRL_FREQ_SEL_SHIFT)
/* Transfer maximum clock frequency to register setting */
static u32 aspeed_get_clk_div_ast2400(struct aspeed_spi_chip *chip,
u32 max_hz)
{
struct device *dev = chip->aspi->dev;
u32 hclk_clk = chip->aspi->clk_freq;
u32 div_ctl = 0;
u32 i;
bool found = false;
/* FMC/SPIR10[11:8] */
for (i = 1; i <= ARRAY_SIZE(aspeed_spi_hclk_divs); i++) {
if (hclk_clk / i <= max_hz) {
found = true;
break;
}
}
if (found) {
div_ctl = ASPEED_SPI_HCLK_DIV(i);
chip->clk_freq = hclk_clk / i;
}
dev_dbg(dev, "found: %s, hclk: %d, max_clk: %d\n",
found ? "yes" : "no", hclk_clk, max_hz);
if (found) {
dev_dbg(dev, "h_div: 0x%08x, speed: %d\n",
div_ctl, chip->clk_freq);
}
return div_ctl;
}
static u32 aspeed_get_clk_div_ast2500(struct aspeed_spi_chip *chip,
u32 max_hz)
{
struct device *dev = chip->aspi->dev;
u32 hclk_clk = chip->aspi->clk_freq;
u32 div_ctl = 0;
u32 i;
bool found = false;
/* FMC/SPIR10[11:8] */
for (i = 1; i <= ARRAY_SIZE(aspeed_spi_hclk_divs); i++) {
if (hclk_clk / i <= max_hz) {
found = true;
chip->clk_freq = hclk_clk / i;
break;
}
}
if (found) {
div_ctl = ASPEED_SPI_HCLK_DIV(i);
goto end;
}
for (i = 1; i <= ARRAY_SIZE(aspeed_spi_hclk_divs); i++) {
if (hclk_clk / (i * 4) <= max_hz) {
found = true;
chip->clk_freq = hclk_clk / (i * 4);
break;
}
}
if (found)
div_ctl = BIT(13) | ASPEED_SPI_HCLK_DIV(i);
end:
dev_dbg(dev, "found: %s, hclk: %d, max_clk: %d\n",
found ? "yes" : "no", hclk_clk, max_hz);
if (found) {
dev_dbg(dev, "h_div: 0x%08x, speed: %d\n",
div_ctl, chip->clk_freq);
}
return div_ctl;
}
static u32 aspeed_get_clk_div_ast2600(struct aspeed_spi_chip *chip,
u32 max_hz)
{
struct device *dev = chip->aspi->dev;
u32 hclk_clk = chip->aspi->clk_freq;
u32 div_ctl = 0;
u32 i, j;
bool found = false;
/* FMC/SPIR10[27:24] */
for (j = 0; j < 16; j++) {
/* FMC/SPIR10[11:8] */
for (i = 1; i <= ARRAY_SIZE(aspeed_spi_hclk_divs); i++) {
if (j == 0 && i == 1)
continue;
if (hclk_clk / (j * 16 + i) <= max_hz) {
found = true;
break;
}
}
if (found) {
div_ctl = ((j << 24) | ASPEED_SPI_HCLK_DIV(i));
chip->clk_freq = hclk_clk / (j * 16 + i);
break;
}
}
dev_dbg(dev, "found: %s, hclk: %d, max_clk: %d\n",
found ? "yes" : "no", hclk_clk, max_hz);
if (found) {
dev_dbg(dev, "h_div: 0x%08x, speed: %d\n",
div_ctl, chip->clk_freq);
}
return div_ctl;
}
static int aspeed_spi_do_calibration(struct aspeed_spi_chip *chip)
{
struct aspeed_spi *aspi = chip->aspi;
const struct aspeed_spi_data *data = aspi->data;
u32 ahb_freq = aspi->clk_freq;
u32 max_freq = chip->clk_freq;
bool exec_calib = false;
u32 best_freq = 0;
u32 ctl_val;
u8 *golden_buf = NULL;
u8 *test_buf = NULL;
int i, rc;
u32 div_ctl;
dev_dbg(aspi->dev, "calculate timing compensation - AHB freq: %d MHz",
ahb_freq / 1000000);
/*
* use the related low frequency to get check calibration data
* and get golden data.
*/
ctl_val = chip->ctl_val[ASPEED_SPI_READ] & data->hclk_mask;
writel(ctl_val, chip->ctl);
test_buf = kzalloc(CALIBRATE_BUF_SIZE * 2, GFP_KERNEL);
if (!test_buf)
return -ENOMEM;
golden_buf = test_buf + CALIBRATE_BUF_SIZE;
memcpy_fromio(golden_buf, chip->ahb_base, CALIBRATE_BUF_SIZE);
if (!aspeed_spi_check_calib_data(golden_buf, CALIBRATE_BUF_SIZE)) {
dev_info(aspi->dev, "Calibration area too uniform, using low speed");
goto end_calib;
}
#if defined(VERBOSE_DEBUG)
print_hex_dump_bytes(DEVICE_NAME " good: ", DUMP_PREFIX_NONE,
golden_buf, 0x100);
#endif
/* Now we iterate the HCLK dividers until we find our breaking point */
for (i = 5; i > data->hdiv_max - 1; i--) {
u32 tv, freq;
freq = ahb_freq / i;
if (freq > max_freq)
continue;
/* Set the timing */
tv = chip->ctl_val[ASPEED_SPI_READ] | ASPEED_SPI_HCLK_DIV(i);
writel(tv, chip->ctl);
dev_dbg(aspi->dev, "Trying HCLK/%d [%08x] ...", i, tv);
rc = data->calibrate(chip, i, golden_buf, test_buf);
if (rc == 0)
best_freq = freq;
exec_calib = true;
}
end_calib:
if (!exec_calib) {
/* calibration process is not executed */
dev_warn(aspi->dev, "Force to dts configuration %dkHz.\n",
max_freq / 1000);
div_ctl = data->get_clk_div(chip, max_freq);
} else if (best_freq == 0) {
/* calibration process is executed, but no good frequency */
dev_warn(aspi->dev, "No good frequency, using dumb slow\n");
div_ctl = 0;
} else {
dev_dbg(aspi->dev, "Found good read timings at %dMHz.\n",
best_freq / 1000000);
div_ctl = data->get_clk_div(chip, best_freq);
}
/* Record the freq */
for (i = 0; i < ASPEED_SPI_MAX; i++) {
chip->ctl_val[i] = (chip->ctl_val[i] & data->hclk_mask) |
div_ctl;
}
writel(chip->ctl_val[ASPEED_SPI_READ], chip->ctl);
kfree(test_buf);
return 0;
}
#define TIMING_DELAY_DI BIT(3)
#define TIMING_DELAY_HCYCLE_MAX 5
#define TIMING_DELAY_INPUT_MAX 16
#define TIMING_REG_AST2600(chip) \
((chip)->aspi->regs + (chip)->aspi->data->timing + \
(chip)->cs * 4)
/*
* This function returns the center point of the longest
* continuous "pass" interval within the buffer. The interval
* must contains the highest number of consecutive "pass"
* results and not span across multiple rows.
*/
static u32 aspeed_spi_ast2600_optimized_timing(u32 rows, u32 cols, u8 *buf)
{
int r = 0, c = 0;
int max = 0;
int i, j;
for (i = 0; i < rows; i++) {
for (j = 0; j < cols;) {
int k = j;
while (k < cols && buf[(i * cols) + k])
k++;
if (k - j > max) {
max = k - j;
r = i;
c = j + (k - j) / 2;
}
j = k + 1;
}
}
return max > 4 ? r * cols + c : 0;
}
static int aspeed_spi_ast2600_calibrate(struct aspeed_spi_chip *chip, u32 hdiv,
const u8 *golden_buf, u8 *test_buf)
{
struct aspeed_spi *aspi = chip->aspi;
int hcycle;
int delay_ns;
u32 shift = (hdiv - 2) << 3;
u32 mask = ~(0xffu << shift);
u32 fread_timing_val = 0;
u8 calib_res[6][17] = {0};
u32 calib_point;
for (hcycle = 0; hcycle <= TIMING_DELAY_HCYCLE_MAX; hcycle++) {
bool pass = false;
fread_timing_val &= mask;
fread_timing_val |= hcycle << shift;
/* no DI input delay first */
writel(fread_timing_val, TIMING_REG_AST2600(chip));
pass = aspeed_spi_check_reads(chip, golden_buf, test_buf);
dev_dbg(aspi->dev,
" * [%08x] %d HCLK delay, DI delay none : %s",
fread_timing_val, hcycle, pass ? "PASS" : "FAIL");
if (pass)
calib_res[hcycle][0] = 1;
/* Add DI input delays */
fread_timing_val &= mask;
fread_timing_val |= (TIMING_DELAY_DI | hcycle) << shift;
for (delay_ns = 0; delay_ns < TIMING_DELAY_INPUT_MAX; delay_ns++) {
fread_timing_val &= ~(0xfu << (4 + shift));
fread_timing_val |= delay_ns << (4 + shift);
writel(fread_timing_val, TIMING_REG_AST2600(chip));
pass = aspeed_spi_check_reads(chip, golden_buf, test_buf);
dev_dbg(aspi->dev,
" * [%08x] %d HCLK delay, DI delay %d.%dns : %s",
fread_timing_val, hcycle, (delay_ns + 1) / 2,
(delay_ns + 1) & 1 ? 5 : 5, pass ? "PASS" : "FAIL");
if (pass)
calib_res[hcycle][delay_ns + 1] = 1;
}
}
calib_point = aspeed_spi_ast2600_optimized_timing(6, 17, &calib_res[0][0]);
/* No good setting for this frequency */
if (calib_point == 0)
return -1;
hcycle = calib_point / 17;
delay_ns = calib_point % 17;
fread_timing_val = (TIMING_DELAY_DI | hcycle | (delay_ns << 4)) << shift;
dev_dbg(aspi->dev, "timing val: %08x, final hcycle: %d, delay_ns: %d\n",
fread_timing_val, hcycle, delay_ns);
writel(fread_timing_val, TIMING_REG_AST2600(chip));
return 0;
}
/*
* Platform definitions
*/
static const struct aspeed_spi_data ast2400_fmc_data = {
.max_cs = 5,
.hastype = true,
.we0 = 16,
.ctl0 = CE0_CTRL_REG,
.timing = CE0_TIMING_COMPENSATION_REG,
.hclk_mask = 0xfffff0ff,
.hdiv_max = 1,
.min_window_size = 0x800000,
.full_duplex = false,
.calibrate = aspeed_spi_calibrate,
.get_clk_div = aspeed_get_clk_div_ast2400,
.segment_start = aspeed_spi_segment_start,
.segment_end = aspeed_spi_segment_end,
.segment_reg = aspeed_spi_segment_reg,
.adjust_window = aspeed_adjust_window_ast2400,
};
static const struct aspeed_spi_data ast2400_spi_data = {
.max_cs = 1,
.hastype = false,
.we0 = 0,
.ctl0 = 0x04,
.timing = 0x14,
.hclk_mask = 0xfffff0ff,
.hdiv_max = 1,
.full_duplex = false,
.get_clk_div = aspeed_get_clk_div_ast2400,
.calibrate = aspeed_spi_calibrate,
/* No segment registers */
};
static const struct aspeed_spi_data ast2500_fmc_data = {
.max_cs = 3,
.hastype = true,
.we0 = 16,
.ctl0 = CE0_CTRL_REG,
.timing = CE0_TIMING_COMPENSATION_REG,
.hclk_mask = 0xffffd0ff,
.hdiv_max = 1,
.min_window_size = 0x800000,
.full_duplex = false,
.get_clk_div = aspeed_get_clk_div_ast2500,
.calibrate = aspeed_spi_calibrate,
.segment_start = aspeed_spi_segment_start,
.segment_end = aspeed_spi_segment_end,
.segment_reg = aspeed_spi_segment_reg,
.adjust_window = aspeed_adjust_window_ast2500,
};
static const struct aspeed_spi_data ast2500_spi_data = {
.max_cs = 2,
.hastype = false,
.we0 = 16,
.ctl0 = CE0_CTRL_REG,
.timing = CE0_TIMING_COMPENSATION_REG,
.hclk_mask = 0xffffd0ff,
.hdiv_max = 1,
.min_window_size = 0x800000,
.full_duplex = false,
.get_clk_div = aspeed_get_clk_div_ast2500,
.calibrate = aspeed_spi_calibrate,
.segment_start = aspeed_spi_segment_start,
.segment_end = aspeed_spi_segment_end,
.segment_reg = aspeed_spi_segment_reg,
.adjust_window = aspeed_adjust_window_ast2500,
};
static const struct aspeed_spi_data ast2600_fmc_data = {
.max_cs = 3,
.hastype = false,
.mode_bits = SPI_RX_QUAD | SPI_TX_QUAD,
.we0 = 16,
.ctl0 = CE0_CTRL_REG,
.timing = CE0_TIMING_COMPENSATION_REG,
.hclk_mask = 0xf0fff0ff,
.hdiv_max = 2,
.min_window_size = 0x200000,
.full_duplex = false,
.get_clk_div = aspeed_get_clk_div_ast2600,
.calibrate = aspeed_spi_ast2600_calibrate,
.segment_start = aspeed_spi_segment_ast2600_start,
.segment_end = aspeed_spi_segment_ast2600_end,
.segment_reg = aspeed_spi_segment_ast2600_reg,
.adjust_window = aspeed_adjust_window_ast2600,
};
static const struct aspeed_spi_data ast2600_spi_data = {
.max_cs = 2,
.hastype = false,
.mode_bits = SPI_RX_QUAD | SPI_TX_QUAD,
.we0 = 16,
.ctl0 = CE0_CTRL_REG,
.timing = CE0_TIMING_COMPENSATION_REG,
.hclk_mask = 0xf0fff0ff,
.hdiv_max = 2,
.min_window_size = 0x200000,
.full_duplex = false,
.get_clk_div = aspeed_get_clk_div_ast2600,
.calibrate = aspeed_spi_ast2600_calibrate,
.segment_start = aspeed_spi_segment_ast2600_start,
.segment_end = aspeed_spi_segment_ast2600_end,
.segment_reg = aspeed_spi_segment_ast2600_reg,
.adjust_window = aspeed_adjust_window_ast2600,
};
static const struct aspeed_spi_data ast2700_fmc_data = {
.max_cs = 3,
.hastype = false,
.mode_bits = SPI_RX_QUAD | SPI_TX_QUAD,
.we0 = 16,
.ctl0 = CE0_CTRL_REG,
.timing = CE0_TIMING_COMPENSATION_REG,
.hclk_mask = 0xf0fff0ff,
.hdiv_max = 2,
.min_window_size = 0x10000,
.full_duplex = true,
.get_clk_div = aspeed_get_clk_div_ast2600,
.calibrate = aspeed_spi_ast2600_calibrate,
.segment_start = aspeed_spi_segment_ast2700_start,
.segment_end = aspeed_spi_segment_ast2700_end,
.segment_reg = aspeed_spi_segment_ast2700_reg,
};
static const struct aspeed_spi_data ast2700_spi_data = {
.max_cs = 2,
.hastype = false,
.mode_bits = SPI_RX_QUAD | SPI_TX_QUAD,
.we0 = 16,
.ctl0 = CE0_CTRL_REG,
.timing = CE0_TIMING_COMPENSATION_REG,
.hclk_mask = 0xf0fff0ff,
.hdiv_max = 2,
.min_window_size = 0x10000,
.full_duplex = true,
.get_clk_div = aspeed_get_clk_div_ast2600,
.calibrate = aspeed_spi_ast2600_calibrate,
.segment_start = aspeed_spi_segment_ast2700_start,
.segment_end = aspeed_spi_segment_ast2700_end,
.segment_reg = aspeed_spi_segment_ast2700_reg,
};
static const struct of_device_id aspeed_spi_matches[] = {
{ .compatible = "aspeed,ast2400-fmc", .data = &ast2400_fmc_data },
{ .compatible = "aspeed,ast2400-spi", .data = &ast2400_spi_data },
{ .compatible = "aspeed,ast2500-fmc", .data = &ast2500_fmc_data },
{ .compatible = "aspeed,ast2500-spi", .data = &ast2500_spi_data },
{ .compatible = "aspeed,ast2600-fmc", .data = &ast2600_fmc_data },
{ .compatible = "aspeed,ast2600-spi", .data = &ast2600_spi_data },
{ .compatible = "aspeed,ast2700-fmc", .data = &ast2700_fmc_data },
{ .compatible = "aspeed,ast2700-spi", .data = &ast2700_spi_data },
{ }
};
MODULE_DEVICE_TABLE(of, aspeed_spi_matches);
static struct platform_driver aspeed_spi_driver = {
.probe = aspeed_spi_probe,
.remove = aspeed_spi_remove,
.driver = {
.name = DEVICE_NAME,
.of_match_table = aspeed_spi_matches,
}
};
module_platform_driver(aspeed_spi_driver);
MODULE_DESCRIPTION("ASPEED Static Memory Controller Driver");
MODULE_AUTHOR("Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>");
MODULE_AUTHOR("Cedric Le Goater <clg@kaod.org>");
MODULE_LICENSE("GPL v2");
