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linux/drivers/spi/spi-npcm-fiu.c
Chia-Lin Kao (AceLan) cff49d58f5
spi: Unify error codes by replacing -ENOTSUPP with -EOPNOTSUPP 
This commit updates the SPI subsystem, particularly affecting "SPI MEM"
drivers and core parts, by replacing the -ENOTSUPP error code with
-EOPNOTSUPP.

The key motivations for this change are as follows:
1. The spi-nor driver currently uses EOPNOTSUPP, whereas calls to spi-mem
might return ENOTSUPP. This update aims to unify the error reporting
within the SPI subsystem for clarity and consistency.

2. The use of ENOTSUPP has been flagged by checkpatch as inappropriate,
mainly being reserved for NFS-related errors. To align with kernel coding
standards and recommendations, this change is being made.

3. By using EOPNOTSUPP, we provide more specific context to the error,
indicating that a particular operation is not supported. This helps
differentiate from the more generic ENOTSUPP error, allowing drivers to
better handle and respond to different error scenarios.

Risks and Considerations:
While this change is primarily intended as a code cleanup and error code
unification, there is a minor risk of breaking user-space applications
that rely on specific return codes for unsupported operations. However,
this risk is considered low, as such use-cases are unlikely to be common
or critical. Nevertheless, developers and users should be aware of this
change, especially if they have scripts or tools that specifically handle
SPI error codes.

This commit does not introduce any functional changes to the SPI subsystem
or the affected drivers.

Signed-off-by: "Chia-Lin Kao (AceLan)" <acelan.kao@canonical.com>
Acked-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Acked-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Michael Walle <michael@walle.cc>
Link: https://lore.kernel.org/r/20231129064311.272422-1-acelan.kao@canonical.com
Signed-off-by: Mark Brown <broonie@kernel.org>
2023-11-30 12:12:39 +00:00

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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.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->controller);
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->controller);
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->controller);
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;
if (op->dummy.nbytes)
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->controller);
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->controller);
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->controller);
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 -EOPNOTSUPP;
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->controller);
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->controller;
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;
ctrl = devm_spi_alloc_host(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_enabled(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);
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;
return devm_spi_register_controller(dev, ctrl);
}
static void npcm_fiu_remove(struct platform_device *pdev)
{
}
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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