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linux-zen-desktop/drivers/spi/spi-npcm-fiu.c

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// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2019 Nuvoton Technology corporation.
#include <linux/bits.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/vmalloc.h>
#include <linux/regmap.h>
#include <linux/of_device.h>
#include <linux/spi/spi-mem.h>
#include <linux/mfd/syscon.h>
/* NPCM7xx GCR module */
#define NPCM7XX_INTCR3_OFFSET 0x9C
#define NPCM7XX_INTCR3_FIU_FIX BIT(6)
/* Flash Interface Unit (FIU) Registers */
#define NPCM_FIU_DRD_CFG 0x00
#define NPCM_FIU_DWR_CFG 0x04
#define NPCM_FIU_UMA_CFG 0x08
#define NPCM_FIU_UMA_CTS 0x0C
#define NPCM_FIU_UMA_CMD 0x10
#define NPCM_FIU_UMA_ADDR 0x14
#define NPCM_FIU_PRT_CFG 0x18
#define NPCM_FIU_UMA_DW0 0x20
#define NPCM_FIU_UMA_DW1 0x24
#define NPCM_FIU_UMA_DW2 0x28
#define NPCM_FIU_UMA_DW3 0x2C
#define NPCM_FIU_UMA_DR0 0x30
#define NPCM_FIU_UMA_DR1 0x34
#define NPCM_FIU_UMA_DR2 0x38
#define NPCM_FIU_UMA_DR3 0x3C
#define NPCM_FIU_CFG 0x78
#define NPCM_FIU_MAX_REG_LIMIT 0x80
/* FIU Direct Read Configuration Register */
#define NPCM_FIU_DRD_CFG_LCK BIT(31)
#define NPCM_FIU_DRD_CFG_R_BURST GENMASK(25, 24)
#define NPCM_FIU_DRD_CFG_ADDSIZ GENMASK(17, 16)
#define NPCM_FIU_DRD_CFG_DBW GENMASK(13, 12)
#define NPCM_FIU_DRD_CFG_ACCTYPE GENMASK(9, 8)
#define NPCM_FIU_DRD_CFG_RDCMD GENMASK(7, 0)
#define NPCM_FIU_DRD_ADDSIZ_SHIFT 16
#define NPCM_FIU_DRD_DBW_SHIFT 12
#define NPCM_FIU_DRD_ACCTYPE_SHIFT 8
/* FIU Direct Write Configuration Register */
#define NPCM_FIU_DWR_CFG_LCK BIT(31)
#define NPCM_FIU_DWR_CFG_W_BURST GENMASK(25, 24)
#define NPCM_FIU_DWR_CFG_ADDSIZ GENMASK(17, 16)
#define NPCM_FIU_DWR_CFG_ABPCK GENMASK(11, 10)
#define NPCM_FIU_DWR_CFG_DBPCK GENMASK(9, 8)
#define NPCM_FIU_DWR_CFG_WRCMD GENMASK(7, 0)
#define NPCM_FIU_DWR_ADDSIZ_SHIFT 16
#define NPCM_FIU_DWR_ABPCK_SHIFT 10
#define NPCM_FIU_DWR_DBPCK_SHIFT 8
/* FIU UMA Configuration Register */
#define NPCM_FIU_UMA_CFG_LCK BIT(31)
#define NPCM_FIU_UMA_CFG_CMMLCK BIT(30)
#define NPCM_FIU_UMA_CFG_RDATSIZ GENMASK(28, 24)
#define NPCM_FIU_UMA_CFG_DBSIZ GENMASK(23, 21)
#define NPCM_FIU_UMA_CFG_WDATSIZ GENMASK(20, 16)
#define NPCM_FIU_UMA_CFG_ADDSIZ GENMASK(13, 11)
#define NPCM_FIU_UMA_CFG_CMDSIZ BIT(10)
#define NPCM_FIU_UMA_CFG_RDBPCK GENMASK(9, 8)
#define NPCM_FIU_UMA_CFG_DBPCK GENMASK(7, 6)
#define NPCM_FIU_UMA_CFG_WDBPCK GENMASK(5, 4)
#define NPCM_FIU_UMA_CFG_ADBPCK GENMASK(3, 2)
#define NPCM_FIU_UMA_CFG_CMBPCK GENMASK(1, 0)
#define NPCM_FIU_UMA_CFG_ADBPCK_SHIFT 2
#define NPCM_FIU_UMA_CFG_WDBPCK_SHIFT 4
#define NPCM_FIU_UMA_CFG_DBPCK_SHIFT 6
#define NPCM_FIU_UMA_CFG_RDBPCK_SHIFT 8
#define NPCM_FIU_UMA_CFG_ADDSIZ_SHIFT 11
#define NPCM_FIU_UMA_CFG_WDATSIZ_SHIFT 16
#define NPCM_FIU_UMA_CFG_DBSIZ_SHIFT 21
#define NPCM_FIU_UMA_CFG_RDATSIZ_SHIFT 24
/* FIU UMA Control and Status Register */
#define NPCM_FIU_UMA_CTS_RDYIE BIT(25)
#define NPCM_FIU_UMA_CTS_RDYST BIT(24)
#define NPCM_FIU_UMA_CTS_SW_CS BIT(16)
#define NPCM_FIU_UMA_CTS_DEV_NUM GENMASK(9, 8)
#define NPCM_FIU_UMA_CTS_EXEC_DONE BIT(0)
#define NPCM_FIU_UMA_CTS_DEV_NUM_SHIFT 8
/* FIU UMA Command Register */
#define NPCM_FIU_UMA_CMD_DUM3 GENMASK(31, 24)
#define NPCM_FIU_UMA_CMD_DUM2 GENMASK(23, 16)
#define NPCM_FIU_UMA_CMD_DUM1 GENMASK(15, 8)
#define NPCM_FIU_UMA_CMD_CMD GENMASK(7, 0)
/* FIU UMA Address Register */
#define NPCM_FIU_UMA_ADDR_UMA_ADDR GENMASK(31, 0)
#define NPCM_FIU_UMA_ADDR_AB3 GENMASK(31, 24)
#define NPCM_FIU_UMA_ADDR_AB2 GENMASK(23, 16)
#define NPCM_FIU_UMA_ADDR_AB1 GENMASK(15, 8)
#define NPCM_FIU_UMA_ADDR_AB0 GENMASK(7, 0)
/* FIU UMA Write Data Bytes 0-3 Register */
#define NPCM_FIU_UMA_DW0_WB3 GENMASK(31, 24)
#define NPCM_FIU_UMA_DW0_WB2 GENMASK(23, 16)
#define NPCM_FIU_UMA_DW0_WB1 GENMASK(15, 8)
#define NPCM_FIU_UMA_DW0_WB0 GENMASK(7, 0)
/* FIU UMA Write Data Bytes 4-7 Register */
#define NPCM_FIU_UMA_DW1_WB7 GENMASK(31, 24)
#define NPCM_FIU_UMA_DW1_WB6 GENMASK(23, 16)
#define NPCM_FIU_UMA_DW1_WB5 GENMASK(15, 8)
#define NPCM_FIU_UMA_DW1_WB4 GENMASK(7, 0)
/* FIU UMA Write Data Bytes 8-11 Register */
#define NPCM_FIU_UMA_DW2_WB11 GENMASK(31, 24)
#define NPCM_FIU_UMA_DW2_WB10 GENMASK(23, 16)
#define NPCM_FIU_UMA_DW2_WB9 GENMASK(15, 8)
#define NPCM_FIU_UMA_DW2_WB8 GENMASK(7, 0)
/* FIU UMA Write Data Bytes 12-15 Register */
#define NPCM_FIU_UMA_DW3_WB15 GENMASK(31, 24)
#define NPCM_FIU_UMA_DW3_WB14 GENMASK(23, 16)
#define NPCM_FIU_UMA_DW3_WB13 GENMASK(15, 8)
#define NPCM_FIU_UMA_DW3_WB12 GENMASK(7, 0)
/* FIU UMA Read Data Bytes 0-3 Register */
#define NPCM_FIU_UMA_DR0_RB3 GENMASK(31, 24)
#define NPCM_FIU_UMA_DR0_RB2 GENMASK(23, 16)
#define NPCM_FIU_UMA_DR0_RB1 GENMASK(15, 8)
#define NPCM_FIU_UMA_DR0_RB0 GENMASK(7, 0)
/* FIU UMA Read Data Bytes 4-7 Register */
#define NPCM_FIU_UMA_DR1_RB15 GENMASK(31, 24)
#define NPCM_FIU_UMA_DR1_RB14 GENMASK(23, 16)
#define NPCM_FIU_UMA_DR1_RB13 GENMASK(15, 8)
#define NPCM_FIU_UMA_DR1_RB12 GENMASK(7, 0)
/* FIU UMA Read Data Bytes 8-11 Register */
#define NPCM_FIU_UMA_DR2_RB15 GENMASK(31, 24)
#define NPCM_FIU_UMA_DR2_RB14 GENMASK(23, 16)
#define NPCM_FIU_UMA_DR2_RB13 GENMASK(15, 8)
#define NPCM_FIU_UMA_DR2_RB12 GENMASK(7, 0)
/* FIU UMA Read Data Bytes 12-15 Register */
#define NPCM_FIU_UMA_DR3_RB15 GENMASK(31, 24)
#define NPCM_FIU_UMA_DR3_RB14 GENMASK(23, 16)
#define NPCM_FIU_UMA_DR3_RB13 GENMASK(15, 8)
#define NPCM_FIU_UMA_DR3_RB12 GENMASK(7, 0)
/* FIU Configuration Register */
#define NPCM_FIU_CFG_FIU_FIX BIT(31)
/* FIU Read Mode */
enum {
DRD_SINGLE_WIRE_MODE = 0,
DRD_DUAL_IO_MODE = 1,
DRD_QUAD_IO_MODE = 2,
DRD_SPI_X_MODE = 3,
};
enum {
DWR_ABPCK_BIT_PER_CLK = 0,
DWR_ABPCK_2_BIT_PER_CLK = 1,
DWR_ABPCK_4_BIT_PER_CLK = 2,
};
enum {
DWR_DBPCK_BIT_PER_CLK = 0,
DWR_DBPCK_2_BIT_PER_CLK = 1,
DWR_DBPCK_4_BIT_PER_CLK = 2,
};
#define NPCM_FIU_DRD_16_BYTE_BURST 0x3000000
#define NPCM_FIU_DWR_16_BYTE_BURST 0x3000000
#define MAP_SIZE_128MB 0x8000000
#define MAP_SIZE_16MB 0x1000000
#define MAP_SIZE_8MB 0x800000
#define FIU_DRD_MAX_DUMMY_NUMBER 3
#define NPCM_MAX_CHIP_NUM 4
#define CHUNK_SIZE 16
#define UMA_MICRO_SEC_TIMEOUT 150
enum {
FIU0 = 0,
FIU3,
FIUX,
FIU1,
};
struct npcm_fiu_info {
char *name;
u32 fiu_id;
u32 max_map_size;
u32 max_cs;
};
struct fiu_data {
const struct npcm_fiu_info *npcm_fiu_data_info;
int fiu_max;
};
static const struct npcm_fiu_info npcm7xx_fiu_info[] = {
{.name = "FIU0", .fiu_id = FIU0,
.max_map_size = MAP_SIZE_128MB, .max_cs = 2},
{.name = "FIU3", .fiu_id = FIU3,
.max_map_size = MAP_SIZE_128MB, .max_cs = 4},
{.name = "FIUX", .fiu_id = FIUX,
.max_map_size = MAP_SIZE_16MB, .max_cs = 2} };
static const struct fiu_data npcm7xx_fiu_data = {
.npcm_fiu_data_info = npcm7xx_fiu_info,
.fiu_max = 3,
};
static const struct npcm_fiu_info npxm8xx_fiu_info[] = {
{.name = "FIU0", .fiu_id = FIU0,
.max_map_size = MAP_SIZE_128MB, .max_cs = 2},
{.name = "FIU3", .fiu_id = FIU3,
.max_map_size = MAP_SIZE_128MB, .max_cs = 4},
{.name = "FIUX", .fiu_id = FIUX,
.max_map_size = MAP_SIZE_16MB, .max_cs = 2},
{.name = "FIU1", .fiu_id = FIU1,
.max_map_size = MAP_SIZE_16MB, .max_cs = 4} };
static const struct fiu_data npxm8xx_fiu_data = {
.npcm_fiu_data_info = npxm8xx_fiu_info,
.fiu_max = 4,
};
struct npcm_fiu_spi;
struct npcm_fiu_chip {
void __iomem *flash_region_mapped_ptr;
struct npcm_fiu_spi *fiu;
unsigned long clkrate;
u32 chipselect;
};
struct npcm_fiu_spi {
struct npcm_fiu_chip chip[NPCM_MAX_CHIP_NUM];
const struct npcm_fiu_info *info;
struct spi_mem_op drd_op;
struct resource *res_mem;
struct regmap *regmap;
unsigned long clkrate;
struct device *dev;
struct clk *clk;
bool spix_mode;
};
static const struct regmap_config npcm_mtd_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.max_register = NPCM_FIU_MAX_REG_LIMIT,
};
static void npcm_fiu_set_drd(struct npcm_fiu_spi *fiu,
const struct spi_mem_op *op)
{
regmap_update_bits(fiu->regmap, NPCM_FIU_DRD_CFG,
NPCM_FIU_DRD_CFG_ACCTYPE,
ilog2(op->addr.buswidth) <<
NPCM_FIU_DRD_ACCTYPE_SHIFT);
fiu->drd_op.addr.buswidth = op->addr.buswidth;
regmap_update_bits(fiu->regmap, NPCM_FIU_DRD_CFG,
NPCM_FIU_DRD_CFG_DBW,
op->dummy.nbytes << NPCM_FIU_DRD_DBW_SHIFT);
fiu->drd_op.dummy.nbytes = op->dummy.nbytes;
regmap_update_bits(fiu->regmap, NPCM_FIU_DRD_CFG,
NPCM_FIU_DRD_CFG_RDCMD, op->cmd.opcode);
fiu->drd_op.cmd.opcode = op->cmd.opcode;
regmap_update_bits(fiu->regmap, NPCM_FIU_DRD_CFG,
NPCM_FIU_DRD_CFG_ADDSIZ,
(op->addr.nbytes - 3) << NPCM_FIU_DRD_ADDSIZ_SHIFT);
fiu->drd_op.addr.nbytes = op->addr.nbytes;
}
static ssize_t npcm_fiu_direct_read(struct spi_mem_dirmap_desc *desc,
u64 offs, size_t len, void *buf)
{
struct npcm_fiu_spi *fiu =
spi_controller_get_devdata(desc->mem->spi->master);
struct npcm_fiu_chip *chip = &fiu->chip[spi_get_chipselect(desc->mem->spi, 0)];
void __iomem *src = (void __iomem *)(chip->flash_region_mapped_ptr +
offs);
u8 *buf_rx = buf;
u32 i;
if (fiu->spix_mode) {
for (i = 0 ; i < len ; i++)
*(buf_rx + i) = ioread8(src + i);
} else {
if (desc->info.op_tmpl.addr.buswidth != fiu->drd_op.addr.buswidth ||
desc->info.op_tmpl.dummy.nbytes != fiu->drd_op.dummy.nbytes ||
desc->info.op_tmpl.cmd.opcode != fiu->drd_op.cmd.opcode ||
desc->info.op_tmpl.addr.nbytes != fiu->drd_op.addr.nbytes)
npcm_fiu_set_drd(fiu, &desc->info.op_tmpl);
memcpy_fromio(buf_rx, src, len);
}
return len;
}
static ssize_t npcm_fiu_direct_write(struct spi_mem_dirmap_desc *desc,
u64 offs, size_t len, const void *buf)
{
struct npcm_fiu_spi *fiu =
spi_controller_get_devdata(desc->mem->spi->master);
struct npcm_fiu_chip *chip = &fiu->chip[spi_get_chipselect(desc->mem->spi, 0)];
void __iomem *dst = (void __iomem *)(chip->flash_region_mapped_ptr +
offs);
const u8 *buf_tx = buf;
u32 i;
if (fiu->spix_mode)
for (i = 0 ; i < len ; i++)
iowrite8(*(buf_tx + i), dst + i);
else
memcpy_toio(dst, buf_tx, len);
return len;
}
static int npcm_fiu_uma_read(struct spi_mem *mem,
const struct spi_mem_op *op, u32 addr,
bool is_address_size, u8 *data, u32 data_size)
{
struct npcm_fiu_spi *fiu =
spi_controller_get_devdata(mem->spi->master);
u32 uma_cfg = BIT(10);
u32 data_reg[4];
int ret;
u32 val;
u32 i;
regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CTS,
NPCM_FIU_UMA_CTS_DEV_NUM,
(spi_get_chipselect(mem->spi, 0) <<
NPCM_FIU_UMA_CTS_DEV_NUM_SHIFT));
regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CMD,
NPCM_FIU_UMA_CMD_CMD, op->cmd.opcode);
if (is_address_size) {
uma_cfg |= ilog2(op->cmd.buswidth);
uma_cfg |= ilog2(op->addr.buswidth)
<< NPCM_FIU_UMA_CFG_ADBPCK_SHIFT;
uma_cfg |= ilog2(op->dummy.buswidth)
<< NPCM_FIU_UMA_CFG_DBPCK_SHIFT;
uma_cfg |= ilog2(op->data.buswidth)
<< NPCM_FIU_UMA_CFG_RDBPCK_SHIFT;
uma_cfg |= op->dummy.nbytes << NPCM_FIU_UMA_CFG_DBSIZ_SHIFT;
uma_cfg |= op->addr.nbytes << NPCM_FIU_UMA_CFG_ADDSIZ_SHIFT;
regmap_write(fiu->regmap, NPCM_FIU_UMA_ADDR, addr);
} else {
regmap_write(fiu->regmap, NPCM_FIU_UMA_ADDR, 0x0);
}
uma_cfg |= data_size << NPCM_FIU_UMA_CFG_RDATSIZ_SHIFT;
regmap_write(fiu->regmap, NPCM_FIU_UMA_CFG, uma_cfg);
regmap_write_bits(fiu->regmap, NPCM_FIU_UMA_CTS,
NPCM_FIU_UMA_CTS_EXEC_DONE,
NPCM_FIU_UMA_CTS_EXEC_DONE);
ret = regmap_read_poll_timeout(fiu->regmap, NPCM_FIU_UMA_CTS, val,
(!(val & NPCM_FIU_UMA_CTS_EXEC_DONE)), 0,
UMA_MICRO_SEC_TIMEOUT);
if (ret)
return ret;
if (data_size) {
for (i = 0; i < DIV_ROUND_UP(data_size, 4); i++)
regmap_read(fiu->regmap, NPCM_FIU_UMA_DR0 + (i * 4),
&data_reg[i]);
memcpy(data, data_reg, data_size);
}
return 0;
}
static int npcm_fiu_uma_write(struct spi_mem *mem,
const struct spi_mem_op *op, u8 cmd,
bool is_address_size, u8 *data, u32 data_size)
{
struct npcm_fiu_spi *fiu =
spi_controller_get_devdata(mem->spi->master);
u32 uma_cfg = BIT(10);
u32 data_reg[4] = {0};
u32 val;
u32 i;
regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CTS,
NPCM_FIU_UMA_CTS_DEV_NUM,
(spi_get_chipselect(mem->spi, 0) <<
NPCM_FIU_UMA_CTS_DEV_NUM_SHIFT));
regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CMD,
NPCM_FIU_UMA_CMD_CMD, cmd);
if (data_size) {
memcpy(data_reg, data, data_size);
for (i = 0; i < DIV_ROUND_UP(data_size, 4); i++)
regmap_write(fiu->regmap, NPCM_FIU_UMA_DW0 + (i * 4),
data_reg[i]);
}
if (is_address_size) {
uma_cfg |= ilog2(op->cmd.buswidth);
uma_cfg |= ilog2(op->addr.buswidth) <<
NPCM_FIU_UMA_CFG_ADBPCK_SHIFT;
uma_cfg |= ilog2(op->data.buswidth) <<
NPCM_FIU_UMA_CFG_WDBPCK_SHIFT;
uma_cfg |= op->addr.nbytes << NPCM_FIU_UMA_CFG_ADDSIZ_SHIFT;
regmap_write(fiu->regmap, NPCM_FIU_UMA_ADDR, op->addr.val);
} else {
regmap_write(fiu->regmap, NPCM_FIU_UMA_ADDR, 0x0);
}
uma_cfg |= (data_size << NPCM_FIU_UMA_CFG_WDATSIZ_SHIFT);
regmap_write(fiu->regmap, NPCM_FIU_UMA_CFG, uma_cfg);
regmap_write_bits(fiu->regmap, NPCM_FIU_UMA_CTS,
NPCM_FIU_UMA_CTS_EXEC_DONE,
NPCM_FIU_UMA_CTS_EXEC_DONE);
return regmap_read_poll_timeout(fiu->regmap, NPCM_FIU_UMA_CTS, val,
(!(val & NPCM_FIU_UMA_CTS_EXEC_DONE)), 0,
UMA_MICRO_SEC_TIMEOUT);
}
static int npcm_fiu_manualwrite(struct spi_mem *mem,
const struct spi_mem_op *op)
{
struct npcm_fiu_spi *fiu =
spi_controller_get_devdata(mem->spi->master);
u8 *data = (u8 *)op->data.buf.out;
u32 num_data_chunks;
u32 remain_data;
u32 idx = 0;
int ret;
num_data_chunks = op->data.nbytes / CHUNK_SIZE;
remain_data = op->data.nbytes % CHUNK_SIZE;
regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CTS,
NPCM_FIU_UMA_CTS_DEV_NUM,
(spi_get_chipselect(mem->spi, 0) <<
NPCM_FIU_UMA_CTS_DEV_NUM_SHIFT));
regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CTS,
NPCM_FIU_UMA_CTS_SW_CS, 0);
ret = npcm_fiu_uma_write(mem, op, op->cmd.opcode, true, NULL, 0);
if (ret)
return ret;
/* Starting the data writing loop in multiples of 8 */
for (idx = 0; idx < num_data_chunks; ++idx) {
ret = npcm_fiu_uma_write(mem, op, data[0], false,
&data[1], CHUNK_SIZE - 1);
if (ret)
return ret;
data += CHUNK_SIZE;
}
/* Handling chunk remains */
if (remain_data > 0) {
ret = npcm_fiu_uma_write(mem, op, data[0], false,
&data[1], remain_data - 1);
if (ret)
return ret;
}
regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CTS,
NPCM_FIU_UMA_CTS_SW_CS, NPCM_FIU_UMA_CTS_SW_CS);
return 0;
}
static int npcm_fiu_read(struct spi_mem *mem, const struct spi_mem_op *op)
{
u8 *data = op->data.buf.in;
int i, readlen, currlen;
u8 *buf_ptr;
u32 addr;
int ret;
i = 0;
currlen = op->data.nbytes;
do {
addr = ((u32)op->addr.val + i);
if (currlen < 16)
readlen = currlen;
else
readlen = 16;
buf_ptr = data + i;
ret = npcm_fiu_uma_read(mem, op, addr, true, buf_ptr,
readlen);
if (ret)
return ret;
i += readlen;
currlen -= 16;
} while (currlen > 0);
return 0;
}
static void npcm_fiux_set_direct_wr(struct npcm_fiu_spi *fiu)
{
regmap_write(fiu->regmap, NPCM_FIU_DWR_CFG,
NPCM_FIU_DWR_16_BYTE_BURST);
regmap_update_bits(fiu->regmap, NPCM_FIU_DWR_CFG,
NPCM_FIU_DWR_CFG_ABPCK,
DWR_ABPCK_4_BIT_PER_CLK << NPCM_FIU_DWR_ABPCK_SHIFT);
regmap_update_bits(fiu->regmap, NPCM_FIU_DWR_CFG,
NPCM_FIU_DWR_CFG_DBPCK,
DWR_DBPCK_4_BIT_PER_CLK << NPCM_FIU_DWR_DBPCK_SHIFT);
}
static void npcm_fiux_set_direct_rd(struct npcm_fiu_spi *fiu)
{
u32 rx_dummy = 0;
regmap_write(fiu->regmap, NPCM_FIU_DRD_CFG,
NPCM_FIU_DRD_16_BYTE_BURST);
regmap_update_bits(fiu->regmap, NPCM_FIU_DRD_CFG,
NPCM_FIU_DRD_CFG_ACCTYPE,
DRD_SPI_X_MODE << NPCM_FIU_DRD_ACCTYPE_SHIFT);
regmap_update_bits(fiu->regmap, NPCM_FIU_DRD_CFG,
NPCM_FIU_DRD_CFG_DBW,
rx_dummy << NPCM_FIU_DRD_DBW_SHIFT);
}
static int npcm_fiu_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
{
struct npcm_fiu_spi *fiu =
spi_controller_get_devdata(mem->spi->master);
struct npcm_fiu_chip *chip = &fiu->chip[spi_get_chipselect(mem->spi, 0)];
int ret = 0;
u8 *buf;
dev_dbg(fiu->dev, "cmd:%#x mode:%d.%d.%d.%d addr:%#llx len:%#x\n",
op->cmd.opcode, op->cmd.buswidth, op->addr.buswidth,
op->dummy.buswidth, op->data.buswidth, op->addr.val,
op->data.nbytes);
if (fiu->spix_mode || op->addr.nbytes > 4)
return -ENOTSUPP;
if (fiu->clkrate != chip->clkrate) {
ret = clk_set_rate(fiu->clk, chip->clkrate);
if (ret < 0)
dev_warn(fiu->dev, "Failed setting %lu frequency, stay at %lu frequency\n",
chip->clkrate, fiu->clkrate);
else
fiu->clkrate = chip->clkrate;
}
if (op->data.dir == SPI_MEM_DATA_IN) {
if (!op->addr.nbytes) {
buf = op->data.buf.in;
ret = npcm_fiu_uma_read(mem, op, op->addr.val, false,
buf, op->data.nbytes);
} else {
ret = npcm_fiu_read(mem, op);
}
} else {
if (!op->addr.nbytes && !op->data.nbytes)
ret = npcm_fiu_uma_write(mem, op, op->cmd.opcode, false,
NULL, 0);
if (op->addr.nbytes && !op->data.nbytes) {
int i;
u8 buf_addr[4];
u32 addr = op->addr.val;
for (i = op->addr.nbytes - 1; i >= 0; i--) {
buf_addr[i] = addr & 0xff;
addr >>= 8;
}
ret = npcm_fiu_uma_write(mem, op, op->cmd.opcode, false,
buf_addr, op->addr.nbytes);
}
if (!op->addr.nbytes && op->data.nbytes)
ret = npcm_fiu_uma_write(mem, op, op->cmd.opcode, false,
(u8 *)op->data.buf.out,
op->data.nbytes);
if (op->addr.nbytes && op->data.nbytes)
ret = npcm_fiu_manualwrite(mem, op);
}
return ret;
}
static int npcm_fiu_dirmap_create(struct spi_mem_dirmap_desc *desc)
{
struct npcm_fiu_spi *fiu =
spi_controller_get_devdata(desc->mem->spi->master);
struct npcm_fiu_chip *chip = &fiu->chip[spi_get_chipselect(desc->mem->spi, 0)];
struct regmap *gcr_regmap;
if (!fiu->res_mem) {
dev_warn(fiu->dev, "Reserved memory not defined, direct read disabled\n");
desc->nodirmap = true;
return 0;
}
if (!fiu->spix_mode &&
desc->info.op_tmpl.data.dir == SPI_MEM_DATA_OUT) {
desc->nodirmap = true;
return 0;
}
if (!chip->flash_region_mapped_ptr) {
chip->flash_region_mapped_ptr =
devm_ioremap(fiu->dev, (fiu->res_mem->start +
(fiu->info->max_map_size *
spi_get_chipselect(desc->mem->spi, 0))),
(u32)desc->info.length);
if (!chip->flash_region_mapped_ptr) {
dev_warn(fiu->dev, "Error mapping memory region, direct read disabled\n");
desc->nodirmap = true;
return 0;
}
}
if (of_device_is_compatible(fiu->dev->of_node, "nuvoton,npcm750-fiu")) {
gcr_regmap =
syscon_regmap_lookup_by_compatible("nuvoton,npcm750-gcr");
if (IS_ERR(gcr_regmap)) {
dev_warn(fiu->dev, "Didn't find nuvoton,npcm750-gcr, direct read disabled\n");
desc->nodirmap = true;
return 0;
}
regmap_update_bits(gcr_regmap, NPCM7XX_INTCR3_OFFSET,
NPCM7XX_INTCR3_FIU_FIX,
NPCM7XX_INTCR3_FIU_FIX);
} else {
regmap_update_bits(fiu->regmap, NPCM_FIU_CFG,
NPCM_FIU_CFG_FIU_FIX,
NPCM_FIU_CFG_FIU_FIX);
}
if (desc->info.op_tmpl.data.dir == SPI_MEM_DATA_IN) {
if (!fiu->spix_mode)
npcm_fiu_set_drd(fiu, &desc->info.op_tmpl);
else
npcm_fiux_set_direct_rd(fiu);
} else {
npcm_fiux_set_direct_wr(fiu);
}
return 0;
}
static int npcm_fiu_setup(struct spi_device *spi)
{
struct spi_controller *ctrl = spi->master;
struct npcm_fiu_spi *fiu = spi_controller_get_devdata(ctrl);
struct npcm_fiu_chip *chip;
chip = &fiu->chip[spi_get_chipselect(spi, 0)];
chip->fiu = fiu;
chip->chipselect = spi_get_chipselect(spi, 0);
chip->clkrate = spi->max_speed_hz;
fiu->clkrate = clk_get_rate(fiu->clk);
return 0;
}
static const struct spi_controller_mem_ops npcm_fiu_mem_ops = {
.exec_op = npcm_fiu_exec_op,
.dirmap_create = npcm_fiu_dirmap_create,
.dirmap_read = npcm_fiu_direct_read,
.dirmap_write = npcm_fiu_direct_write,
};
static const struct of_device_id npcm_fiu_dt_ids[] = {
{ .compatible = "nuvoton,npcm750-fiu", .data = &npcm7xx_fiu_data },
{ .compatible = "nuvoton,npcm845-fiu", .data = &npxm8xx_fiu_data },
{ /* sentinel */ }
};
static int npcm_fiu_probe(struct platform_device *pdev)
{
const struct fiu_data *fiu_data_match;
struct device *dev = &pdev->dev;
struct spi_controller *ctrl;
struct npcm_fiu_spi *fiu;
void __iomem *regbase;
int id, ret;
ctrl = devm_spi_alloc_master(dev, sizeof(*fiu));
if (!ctrl)
return -ENOMEM;
fiu = spi_controller_get_devdata(ctrl);
fiu_data_match = of_device_get_match_data(dev);
if (!fiu_data_match) {
dev_err(dev, "No compatible OF match\n");
return -ENODEV;
}
id = of_alias_get_id(dev->of_node, "fiu");
if (id < 0 || id >= fiu_data_match->fiu_max) {
dev_err(dev, "Invalid platform device id: %d\n", id);
return -EINVAL;
}
fiu->info = &fiu_data_match->npcm_fiu_data_info[id];
platform_set_drvdata(pdev, fiu);
fiu->dev = dev;
regbase = devm_platform_ioremap_resource_byname(pdev, "control");
if (IS_ERR(regbase))
return PTR_ERR(regbase);
fiu->regmap = devm_regmap_init_mmio(dev, regbase,
&npcm_mtd_regmap_config);
if (IS_ERR(fiu->regmap)) {
dev_err(dev, "Failed to create regmap\n");
return PTR_ERR(fiu->regmap);
}
fiu->res_mem = platform_get_resource_byname(pdev, IORESOURCE_MEM,
"memory");
fiu->clk = devm_clk_get(dev, NULL);
if (IS_ERR(fiu->clk))
return PTR_ERR(fiu->clk);
fiu->spix_mode = of_property_read_bool(dev->of_node,
"nuvoton,spix-mode");
platform_set_drvdata(pdev, fiu);
clk_prepare_enable(fiu->clk);
ctrl->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD
| SPI_TX_DUAL | SPI_TX_QUAD;
ctrl->setup = npcm_fiu_setup;
ctrl->bus_num = -1;
ctrl->mem_ops = &npcm_fiu_mem_ops;
ctrl->num_chipselect = fiu->info->max_cs;
ctrl->dev.of_node = dev->of_node;
ret = devm_spi_register_master(dev, ctrl);
if (ret)
clk_disable_unprepare(fiu->clk);
return ret;
}
static void npcm_fiu_remove(struct platform_device *pdev)
{
struct npcm_fiu_spi *fiu = platform_get_drvdata(pdev);
clk_disable_unprepare(fiu->clk);
}
MODULE_DEVICE_TABLE(of, npcm_fiu_dt_ids);
static struct platform_driver npcm_fiu_driver = {
.driver = {
.name = "NPCM-FIU",
.bus = &platform_bus_type,
.of_match_table = npcm_fiu_dt_ids,
},
.probe = npcm_fiu_probe,
.remove_new = npcm_fiu_remove,
};
module_platform_driver(npcm_fiu_driver);
MODULE_DESCRIPTION("Nuvoton FLASH Interface Unit SPI Controller Driver");
MODULE_AUTHOR("Tomer Maimon <tomer.maimon@nuvoton.com>");
MODULE_LICENSE("GPL v2");
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