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u-boot/drivers/spi/spi-aspeed-smc.c
Chin-Ting Kuo 9a16372023 spi: aspeed: Clock frequency adjustment support 
Driver can configure the SPI clock frequnecy to the
target value of "spi-max-frequency" property in
the device tree. The frequency is divided from HCLK,
200MHz. Usually, the ASPEED SPI clock frequency range
is between 12.5MHz and 100MHz. On AST2600, the lowest
SPI clock frequency can be about 780kHz.

Signed-off-by: Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>
2022-09-13 12:08:41 -04:00

1218 lines
32 KiB
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// SPDX-License-Identifier: GPL-2.0+
/*
* ASPEED FMC/SPI Controller driver
*
* Copyright (c) 2022 ASPEED Corporation.
* Copyright (c) 2022 IBM Corporation.
*
* Author:
* Chin-Ting Kuo <chin-ting_kuo@aspeedtech.com>
* Cedric Le Goater <clg@kaod.org>
*/
#include <asm/io.h>
#include <clk.h>
#include <common.h>
#include <dm.h>
#include <dm/device_compat.h>
#include <linux/bitops.h>
#include <linux/bug.h>
#include <linux/err.h>
#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/mtd/spi-nor.h>
#include <linux/sizes.h>
#include <malloc.h>
#include <spi.h>
#include <spi-mem.h>
#define ASPEED_SPI_MAX_CS 5
#define CTRL_IO_SINGLE_DATA 0
#define CTRL_IO_QUAD_DATA BIT(30)
#define CTRL_IO_DUAL_DATA BIT(29)
#define CTRL_IO_MODE_USER GENMASK(1, 0)
#define CTRL_IO_MODE_CMD_READ BIT(0)
#define CTRL_IO_MODE_CMD_WRITE BIT(1)
#define CTRL_STOP_ACTIVE BIT(2)
struct aspeed_spi_regs {
u32 conf; /* 0x00 CE Type Setting */
u32 ctrl; /* 0x04 CE Control */
u32 intr_ctrl; /* 0x08 Interrupt Control and Status */
u32 cmd_ctrl; /* 0x0c Command Control */
u32 ce_ctrl[ASPEED_SPI_MAX_CS]; /* 0x10 .. 0x20 CEx Control */
u32 _reserved0[3]; /* .. */
u32 segment_addr[ASPEED_SPI_MAX_CS]; /* 0x30 .. 0x40 Segment Address */
u32 _reserved1[3]; /* .. */
u32 soft_rst_cmd_ctrl; /* 0x50 Auto Soft-Reset Command Control */
u32 _reserved2[11]; /* .. */
u32 dma_ctrl; /* 0x80 DMA Control/Status */
u32 dma_flash_addr; /* 0x84 DMA Flash Side Address */
u32 dma_dram_addr; /* 0x88 DMA DRAM Side Address */
u32 dma_len; /* 0x8c DMA Length Register */
u32 dma_checksum; /* 0x90 Checksum Calculation Result */
u32 timings[ASPEED_SPI_MAX_CS]; /* 0x94 Read Timing Compensation */
};
struct aspeed_spi_plat {
u8 max_cs;
void __iomem *ahb_base; /* AHB address base for all flash devices. */
fdt_size_t ahb_sz; /* Overall AHB window size for all flash device. */
u32 hclk_rate; /* AHB clock rate */
};
struct aspeed_spi_flash {
void __iomem *ahb_base;
u32 ahb_decoded_sz;
u32 ce_ctrl_user;
u32 ce_ctrl_read;
u32 max_freq;
};
struct aspeed_spi_priv {
u32 num_cs;
struct aspeed_spi_regs *regs;
struct aspeed_spi_info *info;
struct aspeed_spi_flash flashes[ASPEED_SPI_MAX_CS];
bool fixed_decoded_range;
};
struct aspeed_spi_info {
u32 io_mode_mask;
u32 max_bus_width;
u32 min_decoded_sz;
u32 clk_ctrl_mask;
void (*set_4byte)(struct udevice *bus, u32 cs);
u32 (*segment_start)(struct udevice *bus, u32 reg);
u32 (*segment_end)(struct udevice *bus, u32 reg);
u32 (*segment_reg)(u32 start, u32 end);
int (*adjust_decoded_sz)(struct udevice *bus);
u32 (*get_clk_setting)(struct udevice *dev, uint hz);
};
struct aspeed_spi_decoded_range {
u32 cs;
u32 ahb_base;
u32 sz;
};
static const struct aspeed_spi_info ast2400_spi_info;
static const struct aspeed_spi_info ast2500_fmc_info;
static const struct aspeed_spi_info ast2500_spi_info;
static int aspeed_spi_decoded_range_config(struct udevice *bus);
static int aspeed_spi_trim_decoded_size(struct udevice *bus);
static u32 aspeed_spi_get_io_mode(u32 bus_width)
{
switch (bus_width) {
case 1:
return CTRL_IO_SINGLE_DATA;
case 2:
return CTRL_IO_DUAL_DATA;
case 4:
return CTRL_IO_QUAD_DATA;
default:
/* keep in default value */
return CTRL_IO_SINGLE_DATA;
}
}
static u32 ast2400_spi_segment_start(struct udevice *bus, u32 reg)
{
struct aspeed_spi_plat *plat = dev_get_plat(bus);
u32 start_offset = ((reg >> 16) & 0xff) << 23;
if (start_offset == 0)
return (u32)plat->ahb_base;
return (u32)plat->ahb_base + start_offset;
}
static u32 ast2400_spi_segment_end(struct udevice *bus, u32 reg)
{
struct aspeed_spi_plat *plat = dev_get_plat(bus);
u32 end_offset = ((reg >> 24) & 0xff) << 23;
/* Meaningless end_offset, set to physical ahb base. */
if (end_offset == 0)
return (u32)plat->ahb_base;
return (u32)plat->ahb_base + end_offset;
}
static u32 ast2400_spi_segment_reg(u32 start, u32 end)
{
if (start == end)
return 0;
return ((((start) >> 23) & 0xff) << 16) | ((((end) >> 23) & 0xff) << 24);
}
static void ast2400_fmc_chip_set_4byte(struct udevice *bus, u32 cs)
{
struct aspeed_spi_priv *priv = dev_get_priv(bus);
u32 reg_val;
reg_val = readl(&priv->regs->ctrl);
reg_val |= 0x1 << cs;
writel(reg_val, &priv->regs->ctrl);
}
static void ast2400_spi_chip_set_4byte(struct udevice *bus, u32 cs)
{
struct aspeed_spi_priv *priv = dev_get_priv(bus);
struct aspeed_spi_flash *flash = &priv->flashes[cs];
flash->ce_ctrl_read |= BIT(13);
writel(flash->ce_ctrl_read, &priv->regs->ctrl);
}
/* Transfer maximum clock frequency to register setting */
static u32 ast2400_get_clk_setting(struct udevice *dev, uint max_hz)
{
struct aspeed_spi_plat *plat = dev_get_plat(dev->parent);
struct aspeed_spi_priv *priv = dev_get_priv(dev->parent);
struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev);
u32 hclk_clk = plat->hclk_rate;
u32 hclk_div = 0x0000; /* default value */
u32 i;
bool found = false;
/* HCLK/1 .. HCLK/16 */
u32 hclk_masks[] = {15, 7, 14, 6, 13, 5, 12, 4,
11, 3, 10, 2, 9, 1, 8, 0};
/* FMC/SPIR10[11:8] */
for (i = 0; i < ARRAY_SIZE(hclk_masks); i++) {
if (hclk_clk / (i + 1) <= max_hz) {
found = true;
break;
}
}
if (found) {
hclk_div = hclk_masks[i] << 8;
priv->flashes[slave_plat->cs].max_freq = hclk_clk / (i + 1);
}
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: %d (mask %x), speed: %d\n",
i + 1, hclk_masks[i], priv->flashes[slave_plat->cs].max_freq);
}
return hclk_div;
}
static u32 ast2500_spi_segment_start(struct udevice *bus, u32 reg)
{
struct aspeed_spi_plat *plat = dev_get_plat(bus);
u32 start_offset = ((reg >> 16) & 0xff) << 23;
if (start_offset == 0)
return (u32)plat->ahb_base;
return (u32)plat->ahb_base + start_offset;
}
static u32 ast2500_spi_segment_end(struct udevice *bus, u32 reg)
{
struct aspeed_spi_plat *plat = dev_get_plat(bus);
u32 end_offset = ((reg >> 24) & 0xff) << 23;
/* Meaningless end_offset, set to physical ahb base. */
if (end_offset == 0)
return (u32)plat->ahb_base;
return (u32)plat->ahb_base + end_offset;
}
static u32 ast2500_spi_segment_reg(u32 start, u32 end)
{
if (start == end)
return 0;
return ((((start) >> 23) & 0xff) << 16) | ((((end) >> 23) & 0xff) << 24);
}
static void ast2500_spi_chip_set_4byte(struct udevice *bus, u32 cs)
{
struct aspeed_spi_priv *priv = dev_get_priv(bus);
u32 reg_val;
reg_val = readl(&priv->regs->ctrl);
reg_val |= 0x1 << cs;
writel(reg_val, &priv->regs->ctrl);
}
/*
* For AST2500, the minimum address decoded size for each CS
* is 8MB instead of zero. This address decoded size is
* mandatory for each CS no matter whether it will be used.
* This is a HW limitation.
*/
static int ast2500_adjust_decoded_size(struct udevice *bus)
{
struct aspeed_spi_plat *plat = dev_get_plat(bus);
struct aspeed_spi_priv *priv = dev_get_priv(bus);
struct aspeed_spi_flash *flashes = &priv->flashes[0];
int ret;
int i;
int cs;
u32 pre_sz;
u32 lack_sz;
/* Assign min_decoded_sz to unused CS. */
for (cs = priv->num_cs; cs < plat->max_cs; cs++)
flashes[cs].ahb_decoded_sz = priv->info->min_decoded_sz;
/*
* If commnad mode or normal mode is used, the start address of a
* decoded range should be multiple of its related flash size.
* Namely, the total decoded size from flash 0 to flash N should
* be multiple of the size of flash (N + 1).
*/
for (cs = priv->num_cs - 1; cs >= 0; cs--) {
pre_sz = 0;
for (i = 0; i < cs; i++)
pre_sz += flashes[i].ahb_decoded_sz;
if (flashes[cs].ahb_decoded_sz != 0 &&
(pre_sz % flashes[cs].ahb_decoded_sz) != 0) {
lack_sz = flashes[cs].ahb_decoded_sz -
(pre_sz % flashes[cs].ahb_decoded_sz);
flashes[0].ahb_decoded_sz += lack_sz;
}
}
ret = aspeed_spi_trim_decoded_size(bus);
if (ret != 0)
return ret;
return 0;
}
static u32 ast2500_get_clk_setting(struct udevice *dev, uint max_hz)
{
struct aspeed_spi_plat *plat = dev_get_plat(dev->parent);
struct aspeed_spi_priv *priv = dev_get_priv(dev->parent);
struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev);
u32 hclk_clk = plat->hclk_rate;
u32 hclk_div = 0x0000; /* default value */
u32 i;
bool found = false;
/* HCLK/1 .. HCLK/16 */
u32 hclk_masks[] = {15, 7, 14, 6, 13, 5, 12, 4,
11, 3, 10, 2, 9, 1, 8, 0};
/* FMC/SPIR10[11:8] */
for (i = 0; i < ARRAY_SIZE(hclk_masks); i++) {
if (hclk_clk / (i + 1) <= max_hz) {
found = true;
priv->flashes[slave_plat->cs].max_freq =
hclk_clk / (i + 1);
break;
}
}
if (found) {
hclk_div = hclk_masks[i] << 8;
goto end;
}
for (i = 0; i < ARRAY_SIZE(hclk_masks); i++) {
if (hclk_clk / ((i + 1) * 4) <= max_hz) {
found = true;
priv->flashes[slave_plat->cs].max_freq =
hclk_clk / ((i + 1) * 4);
break;
}
}
if (found)
hclk_div = BIT(13) | (hclk_masks[i] << 8);
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: %d (mask %x), speed: %d\n",
i + 1, hclk_masks[i], priv->flashes[slave_plat->cs].max_freq);
}
return hclk_div;
}
static u32 ast2600_spi_segment_start(struct udevice *bus, u32 reg)
{
struct aspeed_spi_plat *plat = dev_get_plat(bus);
u32 start_offset = (reg << 16) & 0x0ff00000;
if (start_offset == 0)
return (u32)plat->ahb_base;
return (u32)plat->ahb_base + start_offset;
}
static u32 ast2600_spi_segment_end(struct udevice *bus, u32 reg)
{
struct aspeed_spi_plat *plat = dev_get_plat(bus);
u32 end_offset = reg & 0x0ff00000;
/* Meaningless end_offset, set to physical ahb base. */
if (end_offset == 0)
return (u32)plat->ahb_base;
return (u32)plat->ahb_base + end_offset + 0x100000;
}
static u32 ast2600_spi_segment_reg(u32 start, u32 end)
{
if (start == end)
return 0;
return ((start & 0x0ff00000) >> 16) | ((end - 0x100000) & 0x0ff00000);
}
static void ast2600_spi_chip_set_4byte(struct udevice *bus, u32 cs)
{
struct aspeed_spi_priv *priv = dev_get_priv(bus);
u32 reg_val;
reg_val = readl(&priv->regs->ctrl);
reg_val |= 0x11 << cs;
writel(reg_val, &priv->regs->ctrl);
}
static int ast2600_adjust_decoded_size(struct udevice *bus)
{
struct aspeed_spi_plat *plat = dev_get_plat(bus);
struct aspeed_spi_priv *priv = dev_get_priv(bus);
struct aspeed_spi_flash *flashes = &priv->flashes[0];
int ret;
int i;
int cs;
u32 pre_sz;
u32 lack_sz;
/* Close unused CS. */
for (cs = priv->num_cs; cs < plat->max_cs; cs++)
flashes[cs].ahb_decoded_sz = 0;
/*
* If commnad mode or normal mode is used, the start address of a
* decoded range should be multiple of its related flash size.
* Namely, the total decoded size from flash 0 to flash N should
* be multiple of the size of flash (N + 1).
*/
for (cs = priv->num_cs - 1; cs >= 0; cs--) {
pre_sz = 0;
for (i = 0; i < cs; i++)
pre_sz += flashes[i].ahb_decoded_sz;
if (flashes[cs].ahb_decoded_sz != 0 &&
(pre_sz % flashes[cs].ahb_decoded_sz) != 0) {
lack_sz = flashes[cs].ahb_decoded_sz -
(pre_sz % flashes[cs].ahb_decoded_sz);
flashes[0].ahb_decoded_sz += lack_sz;
}
}
ret = aspeed_spi_trim_decoded_size(bus);
if (ret != 0)
return ret;
return 0;
}
static u32 ast2600_get_clk_setting(struct udevice *dev, uint max_hz)
{
struct aspeed_spi_plat *plat = dev_get_plat(dev->parent);
struct aspeed_spi_priv *priv = dev_get_priv(dev->parent);
struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev);
u32 hclk_clk = plat->hclk_rate;
u32 hclk_div = 0x0400; /* default value */
u32 i, j;
bool found = false;
/* HCLK/1 .. HCLK/16 */
u32 hclk_masks[] = {15, 7, 14, 6, 13, 5, 12, 4,
11, 3, 10, 2, 9, 1, 8, 0};
/* FMC/SPIR10[27:24] */
for (j = 0; j < 0xf; j++) {
/* FMC/SPIR10[11:8] */
for (i = 0; i < ARRAY_SIZE(hclk_masks); i++) {
if (i == 0 && j == 0)
continue;
if (hclk_clk / (i + 1 + (j * 16)) <= max_hz) {
found = true;
break;
}
}
if (found) {
hclk_div = ((j << 24) | hclk_masks[i] << 8);
priv->flashes[slave_plat->cs].max_freq =
hclk_clk / (i + 1 + j * 16);
break;
}
}
dev_dbg(dev, "found: %s, hclk: %d, max_clk: %d\n", found ? "yes" : "no",
hclk_clk, max_hz);
if (found) {
dev_dbg(dev, "base_clk: %d, h_div: %d (mask %x), speed: %d\n",
j, i + 1, hclk_masks[i], priv->flashes[slave_plat->cs].max_freq);
}
return hclk_div;
}
/*
* As the flash size grows up, we need to trim some decoded
* size if needed for the sake of conforming the maximum
* decoded size. We trim the decoded size from the largest
* CS in order to avoid affecting the default boot up sequence
* from CS0 where command mode or normal mode is used.
* Notice, if a CS decoded size is trimmed, command mode may
* not work perfectly on that CS.
*/
static int aspeed_spi_trim_decoded_size(struct udevice *bus)
{
struct aspeed_spi_plat *plat = dev_get_plat(bus);
struct aspeed_spi_priv *priv = dev_get_priv(bus);
struct aspeed_spi_flash *flashes = &priv->flashes[0];
u32 total_sz;
int cs = plat->max_cs - 1;
u32 i;
do {
total_sz = 0;
for (i = 0; i < plat->max_cs; i++)
total_sz += flashes[i].ahb_decoded_sz;
if (flashes[cs].ahb_decoded_sz <= priv->info->min_decoded_sz)
cs--;
if (cs < 0)
return -ENOMEM;
if (total_sz > plat->ahb_sz) {
flashes[cs].ahb_decoded_sz -=
priv->info->min_decoded_sz;
total_sz -= priv->info->min_decoded_sz;
}
} while (total_sz > plat->ahb_sz);
return 0;
}
static int aspeed_spi_read_from_ahb(void __iomem *ahb_base, void *buf,
size_t len)
{
size_t offset = 0;
if (IS_ALIGNED((uintptr_t)ahb_base, sizeof(uintptr_t)) &&
IS_ALIGNED((uintptr_t)buf, sizeof(uintptr_t))) {
readsl(ahb_base, buf, len >> 2);
offset = len & ~0x3;
len -= offset;
}
readsb(ahb_base, (u8 *)buf + offset, len);
return 0;
}
static int aspeed_spi_write_to_ahb(void __iomem *ahb_base, const void *buf,
size_t len)
{
size_t offset = 0;
if (IS_ALIGNED((uintptr_t)ahb_base, sizeof(uintptr_t)) &&
IS_ALIGNED((uintptr_t)buf, sizeof(uintptr_t))) {
writesl(ahb_base, buf, len >> 2);
offset = len & ~0x3;
len -= offset;
}
writesb(ahb_base, (u8 *)buf + offset, len);
return 0;
}
/*
* Currently, only support 1-1-1, 1-1-2 or 1-1-4
* SPI NOR flash operation format.
*/
static bool aspeed_spi_supports_op(struct spi_slave *slave,
const struct spi_mem_op *op)
{
struct udevice *bus = slave->dev->parent;
struct aspeed_spi_priv *priv = dev_get_priv(bus);
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 > priv->info->max_bus_width)
return false;
if (!spi_mem_default_supports_op(slave, op))
return false;
return true;
}
static int aspeed_spi_exec_op_user_mode(struct spi_slave *slave,
const struct spi_mem_op *op)
{
struct udevice *dev = slave->dev;
struct udevice *bus = dev->parent;
struct aspeed_spi_priv *priv = dev_get_priv(bus);
struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(slave->dev);
u32 cs = slave_plat->cs;
u32 ce_ctrl_reg = (u32)&priv->regs->ce_ctrl[cs];
u32 ce_ctrl_val;
struct aspeed_spi_flash *flash = &priv->flashes[cs];
u8 dummy_data[16] = {0};
u8 addr[4] = {0};
int i;
dev_dbg(dev, "cmd:%x(%d),addr:%llx(%d),dummy:%d(%d),data_len:0x%x(%d)\n",
op->cmd.opcode, op->cmd.buswidth, op->addr.val,
op->addr.buswidth, op->dummy.nbytes, op->dummy.buswidth,
op->data.nbytes, op->data.buswidth);
if (priv->info == &ast2400_spi_info)
ce_ctrl_reg = (u32)&priv->regs->ctrl;
/*
* Set controller to 4-byte address mode
* if flash is in 4-byte address mode.
*/
if (op->cmd.opcode == SPINOR_OP_EN4B)
priv->info->set_4byte(bus, cs);
/* Start user mode */
ce_ctrl_val = flash->ce_ctrl_user;
writel(ce_ctrl_val, ce_ctrl_reg);
ce_ctrl_val &= (~CTRL_STOP_ACTIVE);
writel(ce_ctrl_val, ce_ctrl_reg);
/* Send command */
aspeed_spi_write_to_ahb(flash->ahb_base, &op->cmd.opcode, 1);
/* Send address */
for (i = op->addr.nbytes; i > 0; i--) {
addr[op->addr.nbytes - i] =
((u32)op->addr.val >> ((i - 1) * 8)) & 0xff;
}
/* Change io_mode */
ce_ctrl_val &= ~priv->info->io_mode_mask;
ce_ctrl_val |= aspeed_spi_get_io_mode(op->addr.buswidth);
writel(ce_ctrl_val, ce_ctrl_reg);
aspeed_spi_write_to_ahb(flash->ahb_base, addr, op->addr.nbytes);
/* Send dummy cycles */
aspeed_spi_write_to_ahb(flash->ahb_base, dummy_data, op->dummy.nbytes);
/* Change io_mode */
ce_ctrl_val &= ~priv->info->io_mode_mask;
ce_ctrl_val |= aspeed_spi_get_io_mode(op->data.buswidth);
writel(ce_ctrl_val, ce_ctrl_reg);
/* Send data */
if (op->data.dir == SPI_MEM_DATA_OUT) {
aspeed_spi_write_to_ahb(flash->ahb_base, op->data.buf.out,
op->data.nbytes);
} else {
aspeed_spi_read_from_ahb(flash->ahb_base, op->data.buf.in,
op->data.nbytes);
}
ce_ctrl_val |= CTRL_STOP_ACTIVE;
writel(ce_ctrl_val, ce_ctrl_reg);
/* Restore controller setting. */
writel(flash->ce_ctrl_read, ce_ctrl_reg);
return 0;
}
static int aspeed_spi_dirmap_create(struct spi_mem_dirmap_desc *desc)
{
int ret = 0;
struct udevice *dev = desc->slave->dev;
struct udevice *bus = dev->parent;
struct aspeed_spi_priv *priv = dev_get_priv(bus);
struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev);
const struct aspeed_spi_info *info = priv->info;
struct spi_mem_op op_tmpl = desc->info.op_tmpl;
u32 i;
u32 cs = slave_plat->cs;
u32 cmd_io_conf;
u32 ce_ctrl_reg;
if (desc->info.op_tmpl.data.dir == SPI_MEM_DATA_OUT) {
/*
* dirmap_write is not supported currently due to a HW
* limitation for command write mode: The written data
* length should be multiple of 4-byte.
*/
return -EOPNOTSUPP;
}
ce_ctrl_reg = (u32)&priv->regs->ce_ctrl[cs];
if (info == &ast2400_spi_info)
ce_ctrl_reg = (u32)&priv->regs->ctrl;
if (desc->info.length > 0x1000000)
priv->info->set_4byte(bus, cs);
/* AST2400 SPI1 doesn't have decoded address segment register. */
if (info != &ast2400_spi_info) {
priv->flashes[cs].ahb_decoded_sz = desc->info.length;
for (i = 0; i < priv->num_cs; i++) {
dev_dbg(dev, "cs: %d, sz: 0x%x\n", i,
priv->flashes[cs].ahb_decoded_sz);
}
ret = aspeed_spi_decoded_range_config(bus);
if (ret)
return ret;
}
cmd_io_conf = aspeed_spi_get_io_mode(op_tmpl.data.buswidth) |
op_tmpl.cmd.opcode << 16 |
((op_tmpl.dummy.nbytes) & 0x3) << 6 |
((op_tmpl.dummy.nbytes) & 0x4) << 14 |
CTRL_IO_MODE_CMD_READ;
priv->flashes[cs].ce_ctrl_read &= priv->info->clk_ctrl_mask;
priv->flashes[cs].ce_ctrl_read |= cmd_io_conf;
writel(priv->flashes[cs].ce_ctrl_read, ce_ctrl_reg);
dev_dbg(dev, "read bus width: %d ce_ctrl_val: 0x%08x\n",
op_tmpl.data.buswidth, priv->flashes[cs].ce_ctrl_read);
return ret;
}
static ssize_t aspeed_spi_dirmap_read(struct spi_mem_dirmap_desc *desc,
u64 offs, size_t len, void *buf)
{
struct udevice *dev = desc->slave->dev;
struct aspeed_spi_priv *priv = dev_get_priv(dev->parent);
struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev);
u32 cs = slave_plat->cs;
int ret;
dev_dbg(dev, "read op:0x%x, addr:0x%llx, len:0x%x\n",
desc->info.op_tmpl.cmd.opcode, offs, len);
if (priv->flashes[cs].ahb_decoded_sz < offs + len ||
(offs % 4) != 0) {
ret = aspeed_spi_exec_op_user_mode(desc->slave,
&desc->info.op_tmpl);
if (ret != 0)
return 0;
} else {
memcpy_fromio(buf, priv->flashes[cs].ahb_base + offs, len);
}
return len;
}
static struct aspeed_spi_flash *aspeed_spi_get_flash(struct udevice *dev)
{
struct udevice *bus = dev->parent;
struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev);
struct aspeed_spi_plat *plat = dev_get_plat(bus);
struct aspeed_spi_priv *priv = dev_get_priv(bus);
u32 cs = slave_plat->cs;
if (cs >= plat->max_cs) {
dev_err(dev, "invalid CS %u\n", cs);
return NULL;
}
return &priv->flashes[cs];
}
static void aspeed_spi_decoded_base_calculate(struct udevice *bus)
{
struct aspeed_spi_plat *plat = dev_get_plat(bus);
struct aspeed_spi_priv *priv = dev_get_priv(bus);
u32 cs;
if (priv->fixed_decoded_range)
return;
priv->flashes[0].ahb_base = plat->ahb_base;
for (cs = 1; cs < plat->max_cs; cs++) {
priv->flashes[cs].ahb_base =
priv->flashes[cs - 1].ahb_base +
priv->flashes[cs - 1].ahb_decoded_sz;
}
}
static void aspeed_spi_decoded_range_set(struct udevice *bus)
{
struct aspeed_spi_plat *plat = dev_get_plat(bus);
struct aspeed_spi_priv *priv = dev_get_priv(bus);
u32 decoded_reg_val;
u32 start_addr, end_addr;
u32 cs;
for (cs = 0; cs < plat->max_cs; cs++) {
start_addr = (u32)priv->flashes[cs].ahb_base;
end_addr = (u32)priv->flashes[cs].ahb_base +
priv->flashes[cs].ahb_decoded_sz;
decoded_reg_val = priv->info->segment_reg(start_addr, end_addr);
writel(decoded_reg_val, &priv->regs->segment_addr[cs]);
dev_dbg(bus, "cs: %d, decoded_reg: 0x%x, start: 0x%x, end: 0x%x\n",
cs, decoded_reg_val, start_addr, end_addr);
}
}
static int aspeed_spi_decoded_range_config(struct udevice *bus)
{
int ret = 0;
struct aspeed_spi_priv *priv = dev_get_priv(bus);
if (priv->info->adjust_decoded_sz &&
!priv->fixed_decoded_range) {
ret = priv->info->adjust_decoded_sz(bus);
if (ret != 0)
return ret;
}
aspeed_spi_decoded_base_calculate(bus);
aspeed_spi_decoded_range_set(bus);
return ret;
}
static int aspeed_spi_decoded_ranges_sanity(struct udevice *bus)
{
struct aspeed_spi_plat *plat = dev_get_plat(bus);
struct aspeed_spi_priv *priv = dev_get_priv(bus);
u32 cs;
u32 total_sz = 0;
/* Check overall size. */
for (cs = 0; cs < plat->max_cs; cs++)
total_sz += priv->flashes[cs].ahb_decoded_sz;
if (total_sz > plat->ahb_sz) {
dev_err(bus, "invalid total size 0x%08x\n", total_sz);
return -EINVAL;
}
/* Check each decoded range size for AST2500. */
if (priv->info == &ast2500_fmc_info ||
priv->info == &ast2500_spi_info) {
for (cs = 0; cs < plat->max_cs; cs++) {
if (priv->flashes[cs].ahb_decoded_sz <
priv->info->min_decoded_sz) {
dev_err(bus, "insufficient decoded range.\n");
return -EINVAL;
}
}
}
/*
* Check overlay. Here, we assume the deccded ranges and
* address base are monotonic increasing with CE#.
*/
for (cs = plat->max_cs - 1; cs > 0; cs--) {
if ((u32)priv->flashes[cs].ahb_base != 0 &&
(u32)priv->flashes[cs].ahb_base <
(u32)priv->flashes[cs - 1].ahb_base +
priv->flashes[cs - 1].ahb_decoded_sz) {
dev_err(bus, "decoded range overlay 0x%08x 0x%08x\n",
(u32)priv->flashes[cs].ahb_base,
(u32)priv->flashes[cs - 1].ahb_base);
return -EINVAL;
}
}
return 0;
}
static int aspeed_spi_read_fixed_decoded_ranges(struct udevice *bus)
{
int ret = 0;
struct aspeed_spi_plat *plat = dev_get_plat(bus);
struct aspeed_spi_priv *priv = dev_get_priv(bus);
const char *range_prop = "decoded-ranges";
struct aspeed_spi_decoded_range ranges[ASPEED_SPI_MAX_CS];
const struct property *prop;
u32 prop_sz;
u32 count;
u32 i;
priv->fixed_decoded_range = false;
prop = dev_read_prop(bus, range_prop, &prop_sz);
if (!prop)
return 0;
count = prop_sz / sizeof(struct aspeed_spi_decoded_range);
if (count > plat->max_cs || count < priv->num_cs) {
dev_err(bus, "invalid '%s' property %d %d\n",
range_prop, count, priv->num_cs);
return -EINVAL;
}
ret = dev_read_u32_array(bus, range_prop, (u32 *)ranges, count * 3);
if (ret)
return ret;
for (i = 0; i < count; i++) {
priv->flashes[ranges[i].cs].ahb_base =
(void __iomem *)ranges[i].ahb_base;
priv->flashes[ranges[i].cs].ahb_decoded_sz =
ranges[i].sz;
}
for (i = 0; i < plat->max_cs; i++) {
dev_dbg(bus, "ahb_base: 0x%p, size: 0x%08x\n",
priv->flashes[i].ahb_base,
priv->flashes[i].ahb_decoded_sz);
}
ret = aspeed_spi_decoded_ranges_sanity(bus);
if (ret != 0)
return ret;
priv->fixed_decoded_range = true;
return 0;
}
/*
* Initialize SPI controller for each chip select.
* Here, only the minimum decode range is configured
* in order to get device (SPI NOR flash) information
* at the early stage.
*/
static int aspeed_spi_ctrl_init(struct udevice *bus)
{
int ret;
struct aspeed_spi_plat *plat = dev_get_plat(bus);
struct aspeed_spi_priv *priv = dev_get_priv(bus);
u32 cs;
u32 reg_val;
u32 decoded_sz;
/* Enable write capability for all CS. */
reg_val = readl(&priv->regs->conf);
if (priv->info == &ast2400_spi_info) {
writel(reg_val | BIT(0), &priv->regs->conf);
} else {
writel(reg_val | (GENMASK(plat->max_cs - 1, 0) << 16),
&priv->regs->conf);
}
memset(priv->flashes, 0x0,
sizeof(struct aspeed_spi_flash) * ASPEED_SPI_MAX_CS);
/* Initial user mode. */
for (cs = 0; cs < priv->num_cs; cs++) {
priv->flashes[cs].ce_ctrl_user &= priv->info->clk_ctrl_mask;
priv->flashes[cs].ce_ctrl_user |=
(CTRL_STOP_ACTIVE | CTRL_IO_MODE_USER);
}
/*
* SPI1 on AST2400 only supports CS0.
* It is unnecessary to configure segment address register.
*/
if (priv->info == &ast2400_spi_info) {
priv->flashes[cs].ahb_base = plat->ahb_base;
priv->flashes[cs].ahb_decoded_sz = 0x10000000;
return 0;
}
ret = aspeed_spi_read_fixed_decoded_ranges(bus);
if (ret != 0)
return ret;
if (!priv->fixed_decoded_range) {
/* Assign basic AHB decoded size for each CS. */
for (cs = 0; cs < plat->max_cs; cs++) {
reg_val = readl(&priv->regs->segment_addr[cs]);
decoded_sz = priv->info->segment_end(bus, reg_val) -
priv->info->segment_start(bus, reg_val);
if (decoded_sz < priv->info->min_decoded_sz)
decoded_sz = priv->info->min_decoded_sz;
priv->flashes[cs].ahb_decoded_sz = decoded_sz;
}
}
ret = aspeed_spi_decoded_range_config(bus);
return ret;
}
static const struct aspeed_spi_info ast2400_fmc_info = {
.io_mode_mask = 0x70000000,
.max_bus_width = 2,
.min_decoded_sz = 0x800000,
.clk_ctrl_mask = 0x00002f00,
.set_4byte = ast2400_fmc_chip_set_4byte,
.segment_start = ast2400_spi_segment_start,
.segment_end = ast2400_spi_segment_end,
.segment_reg = ast2400_spi_segment_reg,
.get_clk_setting = ast2400_get_clk_setting,
};
static const struct aspeed_spi_info ast2400_spi_info = {
.io_mode_mask = 0x70000000,
.max_bus_width = 2,
.min_decoded_sz = 0x800000,
.clk_ctrl_mask = 0x00000f00,
.set_4byte = ast2400_spi_chip_set_4byte,
.segment_start = ast2400_spi_segment_start,
.segment_end = ast2400_spi_segment_end,
.segment_reg = ast2400_spi_segment_reg,
.get_clk_setting = ast2400_get_clk_setting,
};
static const struct aspeed_spi_info ast2500_fmc_info = {
.io_mode_mask = 0x70000000,
.max_bus_width = 2,
.min_decoded_sz = 0x800000,
.clk_ctrl_mask = 0x00002f00,
.set_4byte = ast2500_spi_chip_set_4byte,
.segment_start = ast2500_spi_segment_start,
.segment_end = ast2500_spi_segment_end,
.segment_reg = ast2500_spi_segment_reg,
.adjust_decoded_sz = ast2500_adjust_decoded_size,
.get_clk_setting = ast2500_get_clk_setting,
};
/*
* There are some different between FMC and SPI controllers.
* For example, DMA operation, but this isn't implemented currently.
*/
static const struct aspeed_spi_info ast2500_spi_info = {
.io_mode_mask = 0x70000000,
.max_bus_width = 2,
.min_decoded_sz = 0x800000,
.clk_ctrl_mask = 0x00002f00,
.set_4byte = ast2500_spi_chip_set_4byte,
.segment_start = ast2500_spi_segment_start,
.segment_end = ast2500_spi_segment_end,
.segment_reg = ast2500_spi_segment_reg,
.adjust_decoded_sz = ast2500_adjust_decoded_size,
.get_clk_setting = ast2500_get_clk_setting,
};
static const struct aspeed_spi_info ast2600_fmc_info = {
.io_mode_mask = 0xf0000000,
.max_bus_width = 4,
.min_decoded_sz = 0x200000,
.clk_ctrl_mask = 0x0f000f00,
.set_4byte = ast2600_spi_chip_set_4byte,
.segment_start = ast2600_spi_segment_start,
.segment_end = ast2600_spi_segment_end,
.segment_reg = ast2600_spi_segment_reg,
.adjust_decoded_sz = ast2600_adjust_decoded_size,
.get_clk_setting = ast2600_get_clk_setting,
};
static const struct aspeed_spi_info ast2600_spi_info = {
.io_mode_mask = 0xf0000000,
.max_bus_width = 4,
.min_decoded_sz = 0x200000,
.clk_ctrl_mask = 0x0f000f00,
.set_4byte = ast2600_spi_chip_set_4byte,
.segment_start = ast2600_spi_segment_start,
.segment_end = ast2600_spi_segment_end,
.segment_reg = ast2600_spi_segment_reg,
.adjust_decoded_sz = ast2600_adjust_decoded_size,
.get_clk_setting = ast2600_get_clk_setting,
};
static int aspeed_spi_claim_bus(struct udevice *dev)
{
struct udevice *bus = dev->parent;
struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev);
struct aspeed_spi_priv *priv = dev_get_priv(dev->parent);
struct aspeed_spi_flash *flash = &priv->flashes[slave_plat->cs];
u32 clk_setting;
dev_dbg(bus, "%s: claim bus CS%u\n", bus->name, slave_plat->cs);
if (flash->max_freq == 0) {
clk_setting = priv->info->get_clk_setting(dev, slave_plat->max_hz);
flash->ce_ctrl_user &= ~(priv->info->clk_ctrl_mask);
flash->ce_ctrl_user |= clk_setting;
flash->ce_ctrl_read &= ~(priv->info->clk_ctrl_mask);
flash->ce_ctrl_read |= clk_setting;
}
return 0;
}
static int aspeed_spi_release_bus(struct udevice *dev)
{
struct udevice *bus = dev->parent;
struct dm_spi_slave_plat *slave_plat = dev_get_parent_plat(dev);
dev_dbg(bus, "%s: release bus CS%u\n", bus->name, slave_plat->cs);
if (!aspeed_spi_get_flash(dev))
return -ENODEV;
return 0;
}
static int aspeed_spi_set_mode(struct udevice *bus, uint mode)
{
dev_dbg(bus, "%s: setting mode to %x\n", bus->name, mode);
return 0;
}
static int aspeed_spi_set_speed(struct udevice *bus, uint hz)
{
dev_dbg(bus, "%s: setting speed to %u\n", bus->name, hz);
/*
* ASPEED SPI controller supports multiple CS with different
* clock frequency. We cannot distinguish which CS here.
* Thus, the related implementation is postponed to claim_bus.
*/
return 0;
}
static int apseed_spi_of_to_plat(struct udevice *bus)
{
struct aspeed_spi_plat *plat = dev_get_plat(bus);
struct aspeed_spi_priv *priv = dev_get_priv(bus);
int ret;
struct clk hclk;
priv->regs = (void __iomem *)devfdt_get_addr_index(bus, 0);
if ((u32)priv->regs == FDT_ADDR_T_NONE) {
dev_err(bus, "wrong ctrl base\n");
return -ENODEV;
}
plat->ahb_base =
(void __iomem *)devfdt_get_addr_size_index(bus, 1, &plat->ahb_sz);
if ((u32)plat->ahb_base == FDT_ADDR_T_NONE) {
dev_err(bus, "wrong AHB base\n");
return -ENODEV;
}
plat->max_cs = dev_read_u32_default(bus, "num-cs", ASPEED_SPI_MAX_CS);
if (plat->max_cs > ASPEED_SPI_MAX_CS)
return -EINVAL;
ret = clk_get_by_index(bus, 0, &hclk);
if (ret < 0) {
dev_err(bus, "%s could not get clock: %d\n", bus->name, ret);
return ret;
}
plat->hclk_rate = clk_get_rate(&hclk);
clk_free(&hclk);
dev_dbg(bus, "ctrl_base = 0x%x, ahb_base = 0x%p, size = 0x%lx\n",
(u32)priv->regs, plat->ahb_base, plat->ahb_sz);
dev_dbg(bus, "hclk = %dMHz, max_cs = %d\n",
plat->hclk_rate / 1000000, plat->max_cs);
return 0;
}
static int aspeed_spi_probe(struct udevice *bus)
{
int ret;
struct aspeed_spi_priv *priv = dev_get_priv(bus);
struct udevice *dev;
priv->info = (struct aspeed_spi_info *)dev_get_driver_data(bus);
priv->num_cs = 0;
for (device_find_first_child(bus, &dev); dev;
device_find_next_child(&dev)) {
priv->num_cs++;
}
if (priv->num_cs > ASPEED_SPI_MAX_CS)
return -EINVAL;
ret = aspeed_spi_ctrl_init(bus);
return ret;
}
static const struct spi_controller_mem_ops aspeed_spi_mem_ops = {
.supports_op = aspeed_spi_supports_op,
.exec_op = aspeed_spi_exec_op_user_mode,
.dirmap_create = aspeed_spi_dirmap_create,
.dirmap_read = aspeed_spi_dirmap_read,
};
static const struct dm_spi_ops aspeed_spi_ops = {
.claim_bus = aspeed_spi_claim_bus,
.release_bus = aspeed_spi_release_bus,
.set_speed = aspeed_spi_set_speed,
.set_mode = aspeed_spi_set_mode,
.mem_ops = &aspeed_spi_mem_ops,
};
static const struct udevice_id aspeed_spi_ids[] = {
{ .compatible = "aspeed,ast2400-fmc", .data = (ulong)&ast2400_fmc_info, },
{ .compatible = "aspeed,ast2400-spi", .data = (ulong)&ast2400_spi_info, },
{ .compatible = "aspeed,ast2500-fmc", .data = (ulong)&ast2500_fmc_info, },
{ .compatible = "aspeed,ast2500-spi", .data = (ulong)&ast2500_spi_info, },
{ .compatible = "aspeed,ast2600-fmc", .data = (ulong)&ast2600_fmc_info, },
{ .compatible = "aspeed,ast2600-spi", .data = (ulong)&ast2600_spi_info, },
{ }
};
U_BOOT_DRIVER(aspeed_spi) = {
.name = "aspeed_spi_smc",
.id = UCLASS_SPI,
.of_match = aspeed_spi_ids,
.ops = &aspeed_spi_ops,
.of_to_plat = apseed_spi_of_to_plat,
.plat_auto = sizeof(struct aspeed_spi_plat),
.priv_auto = sizeof(struct aspeed_spi_priv),
.probe = aspeed_spi_probe,
};
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