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Merge remote-tracking branches 'spi/topic/mem' and 'spi/topic/mtd' into spi-next

This commit is contained in:
Mark Brown 2018-12-20 16:01:30 +00:00
parent b3fc4e0e96 aa167f3fed 2a9d92fb3a
commit 74ff666bd7
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
8 changed files with 488 additions and 413 deletions
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0
Documentation/devicetree/bindings/mtd/atmel-quadspi.txt → Documentation/devicetree/bindings/spi/atmel-quadspi.txt
View File

9
drivers/mtd/spi-nor/Kconfig
View File

@ -39,15 +39,6 @@ config SPI_ASPEED_SMC
and support for the SPI flash memory controller (SPI) for
the host firmware. The implementation only supports SPI NOR.
config SPI_ATMEL_QUADSPI
tristate "Atmel Quad SPI Controller"
depends on ARCH_AT91 || (ARM && COMPILE_TEST)
depends on OF && HAS_IOMEM
help
This enables support for the Quad SPI controller in master mode.
This driver does not support generic SPI. The implementation only
supports SPI NOR.
config SPI_CADENCE_QUADSPI
tristate "Cadence Quad SPI controller"
depends on OF && (ARM || ARM64 || COMPILE_TEST)

1
drivers/mtd/spi-nor/Makefile
View File

@ -1,7 +1,6 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_MTD_SPI_NOR) += spi-nor.o
obj-$(CONFIG_SPI_ASPEED_SMC) += aspeed-smc.o
obj-$(CONFIG_SPI_ATMEL_QUADSPI) += atmel-quadspi.o
obj-$(CONFIG_SPI_CADENCE_QUADSPI) += cadence-quadspi.o
obj-$(CONFIG_SPI_FSL_QUADSPI) += fsl-quadspi.o
obj-$(CONFIG_SPI_HISI_SFC) += hisi-sfc.o

9
drivers/spi/Kconfig
View File

@ -91,6 +91,15 @@ config SPI_AT91_USART
This selects a driver for the AT91 USART Controller as SPI Master,
present on AT91 and SAMA5 SoC series.
config SPI_ATMEL_QUADSPI
tristate "Atmel Quad SPI Controller"
depends on ARCH_AT91 || (ARM && COMPILE_TEST && !ARCH_EBSA110)
depends on OF && HAS_IOMEM
help
This enables support for the Quad SPI controller in master mode.
This driver does not support generic SPI. The implementation only
supports spi-mem interface.
config SPI_AU1550
tristate "Au1550/Au1200/Au1300 SPI Controller"
depends on MIPS_ALCHEMY

1
drivers/spi/Makefile
View File

@ -16,6 +16,7 @@ obj-$(CONFIG_SPI_LOOPBACK_TEST) += spi-loopback-test.o
obj-$(CONFIG_SPI_ALTERA) += spi-altera.o
obj-$(CONFIG_SPI_ARMADA_3700) += spi-armada-3700.o
obj-$(CONFIG_SPI_ATMEL) += spi-atmel.o
obj-$(CONFIG_SPI_ATMEL_QUADSPI) += atmel-quadspi.o
obj-$(CONFIG_SPI_AT91_USART) += spi-at91-usart.o
obj-$(CONFIG_SPI_ATH79) += spi-ath79.o
obj-$(CONFIG_SPI_AU1550) += spi-au1550.o

528
drivers/mtd/spi-nor/atmel-quadspi.c → drivers/spi/atmel-quadspi.c
View File

@ -2,8 +2,10 @@
* Driver for Atmel QSPI Controller
*
* Copyright (C) 2015 Atmel Corporation
* Copyright (C) 2018 Cryptera A/S
*
* Author: Cyrille Pitchen <cyrille.pitchen@atmel.com>
* Author: Piotr Bugalski <bugalski.piotr@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@ -27,14 +29,10 @@
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/spi-nor.h>
#include <linux/platform_data/atmel.h>
#include <linux/of.h>
#include <linux/io.h>
#include <linux/gpio/consumer.h>
#include <linux/spi/spi-mem.h>
/* QSPI register offsets */
#define QSPI_CR 0x0000 /* Control Register */
@ -67,7 +65,7 @@
#define QSPI_CR_LASTXFER BIT(24)
/* Bitfields in QSPI_MR (Mode Register) */
#define QSPI_MR_SSM BIT(0)
#define QSPI_MR_SMM BIT(0)
#define QSPI_MR_LLB BIT(1)
#define QSPI_MR_WDRBT BIT(2)
#define QSPI_MR_SMRM BIT(3)
@ -157,33 +155,24 @@ struct atmel_qspi {
struct clk *clk;
struct platform_device *pdev;
u32 pending;
struct spi_nor nor;
u32 clk_rate;
struct completion cmd_completion;
};
struct atmel_qspi_command {
union {
struct {
u32 instruction:1;
u32 address:3;
u32 mode:1;
u32 dummy:1;
u32 data:1;
u32 reserved:25;
} bits;
u32 word;
} enable;
u8 instruction;
u8 mode;
u8 num_mode_cycles;
u8 num_dummy_cycles;
u32 address;
struct qspi_mode {
u8 cmd_buswidth;
u8 addr_buswidth;
u8 data_buswidth;
u32 config;
};
size_t buf_len;
const void *tx_buf;
void *rx_buf;
static const struct qspi_mode sama5d2_qspi_modes[] = {
{ 1, 1, 1, QSPI_IFR_WIDTH_SINGLE_BIT_SPI },
{ 1, 1, 2, QSPI_IFR_WIDTH_DUAL_OUTPUT },
{ 1, 1, 4, QSPI_IFR_WIDTH_QUAD_OUTPUT },
{ 1, 2, 2, QSPI_IFR_WIDTH_DUAL_IO },
{ 1, 4, 4, QSPI_IFR_WIDTH_QUAD_IO },
{ 2, 2, 2, QSPI_IFR_WIDTH_DUAL_CMD },
{ 4, 4, 4, QSPI_IFR_WIDTH_QUAD_CMD },
};
/* Register access functions */
@ -197,246 +186,140 @@ static inline void qspi_writel(struct atmel_qspi *aq, u32 reg, u32 value)
writel_relaxed(value, aq->regs + reg);
}
static int atmel_qspi_run_transfer(struct atmel_qspi *aq,
const struct atmel_qspi_command *cmd)
static inline bool is_compatible(const struct spi_mem_op *op,
const struct qspi_mode *mode)
{
void __iomem *ahb_mem;
if (op->cmd.buswidth != mode->cmd_buswidth)
return false;
/* Then fallback to a PIO transfer (memcpy() DOES NOT work!) */
ahb_mem = aq->mem;
if (cmd->enable.bits.address)
ahb_mem += cmd->address;
if (cmd->tx_buf)
_memcpy_toio(ahb_mem, cmd->tx_buf, cmd->buf_len);
else
_memcpy_fromio(cmd->rx_buf, ahb_mem, cmd->buf_len);
if (op->addr.nbytes && op->addr.buswidth != mode->addr_buswidth)
return false;
return 0;
if (op->data.nbytes && op->data.buswidth != mode->data_buswidth)
return false;
return true;
}
#ifdef DEBUG
static void atmel_qspi_debug_command(struct atmel_qspi *aq,
const struct atmel_qspi_command *cmd,
u32 ifr)
static int find_mode(const struct spi_mem_op *op)
{
u8 cmd_buf[SPI_NOR_MAX_CMD_SIZE];
size_t len = 0;
int i;
u32 i;
if (cmd->enable.bits.instruction)
cmd_buf[len++] = cmd->instruction;
for (i = 0; i < ARRAY_SIZE(sama5d2_qspi_modes); i++)
if (is_compatible(op, &sama5d2_qspi_modes[i]))
return i;
for (i = cmd->enable.bits.address-1; i >= 0; --i)
cmd_buf[len++] = (cmd->address >> (i << 3)) & 0xff;
if (cmd->enable.bits.mode)
cmd_buf[len++] = cmd->mode;
if (cmd->enable.bits.dummy) {
int num = cmd->num_dummy_cycles;
switch (ifr & QSPI_IFR_WIDTH_MASK) {
case QSPI_IFR_WIDTH_SINGLE_BIT_SPI:
case QSPI_IFR_WIDTH_DUAL_OUTPUT:
case QSPI_IFR_WIDTH_QUAD_OUTPUT:
num >>= 3;
break;
case QSPI_IFR_WIDTH_DUAL_IO:
case QSPI_IFR_WIDTH_DUAL_CMD:
num >>= 2;
break;
case QSPI_IFR_WIDTH_QUAD_IO:
case QSPI_IFR_WIDTH_QUAD_CMD:
num >>= 1;
break;
default:
return;
}
for (i = 0; i < num; ++i)
cmd_buf[len++] = 0;
}
/* Dump the SPI command */
print_hex_dump(KERN_DEBUG, "qspi cmd: ", DUMP_PREFIX_NONE,
32, 1, cmd_buf, len, false);
#ifdef VERBOSE_DEBUG
/* If verbose debug is enabled, also dump the TX data */
if (cmd->enable.bits.data && cmd->tx_buf)
print_hex_dump(KERN_DEBUG, "qspi tx : ", DUMP_PREFIX_NONE,
32, 1, cmd->tx_buf, cmd->buf_len, false);
#endif
return -1;
}
#else
#define atmel_qspi_debug_command(aq, cmd, ifr)
#endif
static int atmel_qspi_run_command(struct atmel_qspi *aq,
const struct atmel_qspi_command *cmd,
u32 ifr_tfrtyp, enum spi_nor_protocol proto)
static bool atmel_qspi_supports_op(struct spi_mem *mem,
const struct spi_mem_op *op)
{
if (find_mode(op) < 0)
return false;
/* special case not supported by hardware */
if (op->addr.nbytes == 2 && op->cmd.buswidth != op->addr.buswidth &&
op->dummy.nbytes == 0)
return false;
return true;
}
static int atmel_qspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
{
struct atmel_qspi *aq = spi_controller_get_devdata(mem->spi->master);
int mode;
u32 dummy_cycles = 0;
u32 iar, icr, ifr, sr;
int err = 0;
iar = 0;
icr = 0;
ifr = ifr_tfrtyp;
icr = QSPI_ICR_INST(op->cmd.opcode);
ifr = QSPI_IFR_INSTEN;
/* Set the SPI protocol */
switch (proto) {
case SNOR_PROTO_1_1_1:
ifr |= QSPI_IFR_WIDTH_SINGLE_BIT_SPI;
break;
qspi_writel(aq, QSPI_MR, QSPI_MR_SMM);
case SNOR_PROTO_1_1_2:
ifr |= QSPI_IFR_WIDTH_DUAL_OUTPUT;
break;
mode = find_mode(op);
if (mode < 0)
return -ENOTSUPP;
case SNOR_PROTO_1_1_4:
ifr |= QSPI_IFR_WIDTH_QUAD_OUTPUT;
break;
ifr |= sama5d2_qspi_modes[mode].config;
case SNOR_PROTO_1_2_2:
ifr |= QSPI_IFR_WIDTH_DUAL_IO;
break;
if (op->dummy.buswidth && op->dummy.nbytes)
dummy_cycles = op->dummy.nbytes * 8 / op->dummy.buswidth;
case SNOR_PROTO_1_4_4:
ifr |= QSPI_IFR_WIDTH_QUAD_IO;
break;
case SNOR_PROTO_2_2_2:
ifr |= QSPI_IFR_WIDTH_DUAL_CMD;
break;
case SNOR_PROTO_4_4_4:
ifr |= QSPI_IFR_WIDTH_QUAD_CMD;
break;
default:
return -EINVAL;
}
/* Compute instruction parameters */
if (cmd->enable.bits.instruction) {
icr |= QSPI_ICR_INST(cmd->instruction);
ifr |= QSPI_IFR_INSTEN;
}
/* Compute address parameters */
switch (cmd->enable.bits.address) {
case 4:
ifr |= QSPI_IFR_ADDRL;
/* fall through to the 24bit (3 byte) address case. */
case 3:
iar = (cmd->enable.bits.data) ? 0 : cmd->address;
ifr |= QSPI_IFR_ADDREN;
break;
case 0:
break;
default:
return -EINVAL;
}
/* Compute option parameters */
if (cmd->enable.bits.mode && cmd->num_mode_cycles) {
u32 mode_cycle_bits, mode_bits;
icr |= QSPI_ICR_OPT(cmd->mode);
ifr |= QSPI_IFR_OPTEN;
switch (ifr & QSPI_IFR_WIDTH_MASK) {
case QSPI_IFR_WIDTH_SINGLE_BIT_SPI:
case QSPI_IFR_WIDTH_DUAL_OUTPUT:
case QSPI_IFR_WIDTH_QUAD_OUTPUT:
mode_cycle_bits = 1;
if (op->addr.buswidth) {
switch (op->addr.nbytes) {
case 0:
break;
case QSPI_IFR_WIDTH_DUAL_IO:
case QSPI_IFR_WIDTH_DUAL_CMD:
mode_cycle_bits = 2;
break;
case QSPI_IFR_WIDTH_QUAD_IO:
case QSPI_IFR_WIDTH_QUAD_CMD:
mode_cycle_bits = 4;
break;
default:
return -EINVAL;
}
mode_bits = cmd->num_mode_cycles * mode_cycle_bits;
switch (mode_bits) {
case 1:
ifr |= QSPI_IFR_OPTL_1BIT;
ifr |= QSPI_IFR_OPTEN | QSPI_IFR_OPTL_8BIT;
icr |= QSPI_ICR_OPT(op->addr.val & 0xff);
break;
case 2:
ifr |= QSPI_IFR_OPTL_2BIT;
if (dummy_cycles < 8 / op->addr.buswidth) {
ifr &= ~QSPI_IFR_INSTEN;
ifr |= QSPI_IFR_ADDREN;
iar = (op->cmd.opcode << 16) |
(op->addr.val & 0xffff);
} else {
ifr |= QSPI_IFR_ADDREN;
iar = (op->addr.val << 8) & 0xffffff;
dummy_cycles -= 8 / op->addr.buswidth;
}
break;
case 3:
ifr |= QSPI_IFR_ADDREN;
iar = op->addr.val & 0xffffff;
break;
case 4:
ifr |= QSPI_IFR_OPTL_4BIT;
ifr |= QSPI_IFR_ADDREN | QSPI_IFR_ADDRL;
iar = op->addr.val & 0x7ffffff;
break;
case 8:
ifr |= QSPI_IFR_OPTL_8BIT;
break;
default:
return -EINVAL;
return -ENOTSUPP;
}
}
/* Set number of dummy cycles */
if (cmd->enable.bits.dummy)
ifr |= QSPI_IFR_NBDUM(cmd->num_dummy_cycles);
if (dummy_cycles)
ifr |= QSPI_IFR_NBDUM(dummy_cycles);
/* Set data enable */
if (cmd->enable.bits.data) {
if (op->data.nbytes)
ifr |= QSPI_IFR_DATAEN;
/* Special case for Continuous Read Mode */
if (!cmd->tx_buf && !cmd->rx_buf)
ifr |= QSPI_IFR_CRM;
}
if (op->data.dir == SPI_MEM_DATA_IN && op->data.nbytes)
ifr |= QSPI_IFR_TFRTYP_TRSFR_READ;
else
ifr |= QSPI_IFR_TFRTYP_TRSFR_WRITE;
/* Clear pending interrupts */
(void)qspi_readl(aq, QSPI_SR);
/* Set QSPI Instruction Frame registers */
atmel_qspi_debug_command(aq, cmd, ifr);
qspi_writel(aq, QSPI_IAR, iar);
qspi_writel(aq, QSPI_ICR, icr);
qspi_writel(aq, QSPI_IFR, ifr);
/* Skip to the final steps if there is no data */
if (!cmd->enable.bits.data)
goto no_data;
if (op->data.nbytes) {
/* Dummy read of QSPI_IFR to synchronize APB and AHB accesses */
(void)qspi_readl(aq, QSPI_IFR);
/* Dummy read of QSPI_IFR to synchronize APB and AHB accesses */
(void)qspi_readl(aq, QSPI_IFR);
/* Send/Receive data */
if (op->data.dir == SPI_MEM_DATA_IN)
_memcpy_fromio(op->data.buf.in,
aq->mem + iar, op->data.nbytes);
else
_memcpy_toio(aq->mem + iar,
op->data.buf.out, op->data.nbytes);
/* Stop here for continuous read */
if (!cmd->tx_buf && !cmd->rx_buf)
return 0;
/* Send/Receive data */
err = atmel_qspi_run_transfer(aq, cmd);
/* Release the chip-select */
qspi_writel(aq, QSPI_CR, QSPI_CR_LASTXFER);
}
/* Release the chip-select */
qspi_writel(aq, QSPI_CR, QSPI_CR_LASTXFER);
if (err)
return err;
#if defined(DEBUG) && defined(VERBOSE_DEBUG)
/*
* If verbose debug is enabled, also dump the RX data in addition to
* the SPI command previously dumped by atmel_qspi_debug_command()
*/
if (cmd->rx_buf)
print_hex_dump(KERN_DEBUG, "qspi rx : ", DUMP_PREFIX_NONE,
32, 1, cmd->rx_buf, cmd->buf_len, false);
#endif
no_data:
/* Poll INSTRuction End status */
sr = qspi_readl(aq, QSPI_SR);
if ((sr & QSPI_SR_CMD_COMPLETED) == QSPI_SR_CMD_COMPLETED)
@ -454,129 +337,50 @@ static int atmel_qspi_run_command(struct atmel_qspi *aq,
return err;
}
static int atmel_qspi_read_reg(struct spi_nor *nor, u8 opcode,
u8 *buf, int len)
const char *atmel_qspi_get_name(struct spi_mem *spimem)
{
struct atmel_qspi *aq = nor->priv;
struct atmel_qspi_command cmd;
memset(&cmd, 0, sizeof(cmd));
cmd.enable.bits.instruction = 1;
cmd.enable.bits.data = 1;
cmd.instruction = opcode;
cmd.rx_buf = buf;
cmd.buf_len = len;
return atmel_qspi_run_command(aq, &cmd, QSPI_IFR_TFRTYP_TRSFR_READ,
nor->reg_proto);
return dev_name(spimem->spi->dev.parent);
}
static int atmel_qspi_write_reg(struct spi_nor *nor, u8 opcode,
u8 *buf, int len)
{
struct atmel_qspi *aq = nor->priv;
struct atmel_qspi_command cmd;
memset(&cmd, 0, sizeof(cmd));
cmd.enable.bits.instruction = 1;
cmd.enable.bits.data = (buf != NULL && len > 0);
cmd.instruction = opcode;
cmd.tx_buf = buf;
cmd.buf_len = len;
return atmel_qspi_run_command(aq, &cmd, QSPI_IFR_TFRTYP_TRSFR_WRITE,
nor->reg_proto);
}
static ssize_t atmel_qspi_write(struct spi_nor *nor, loff_t to, size_t len,
const u_char *write_buf)
{
struct atmel_qspi *aq = nor->priv;
struct atmel_qspi_command cmd;
ssize_t ret;
memset(&cmd, 0, sizeof(cmd));
cmd.enable.bits.instruction = 1;
cmd.enable.bits.address = nor->addr_width;
cmd.enable.bits.data = 1;
cmd.instruction = nor->program_opcode;
cmd.address = (u32)to;
cmd.tx_buf = write_buf;
cmd.buf_len = len;
ret = atmel_qspi_run_command(aq, &cmd, QSPI_IFR_TFRTYP_TRSFR_WRITE_MEM,
nor->write_proto);
return (ret < 0) ? ret : len;
}
static int atmel_qspi_erase(struct spi_nor *nor, loff_t offs)
{
struct atmel_qspi *aq = nor->priv;
struct atmel_qspi_command cmd;
memset(&cmd, 0, sizeof(cmd));
cmd.enable.bits.instruction = 1;
cmd.enable.bits.address = nor->addr_width;
cmd.instruction = nor->erase_opcode;
cmd.address = (u32)offs;
return atmel_qspi_run_command(aq, &cmd, QSPI_IFR_TFRTYP_TRSFR_WRITE,
nor->reg_proto);
}
static ssize_t atmel_qspi_read(struct spi_nor *nor, loff_t from, size_t len,
u_char *read_buf)
{
struct atmel_qspi *aq = nor->priv;
struct atmel_qspi_command cmd;
u8 num_mode_cycles, num_dummy_cycles;
ssize_t ret;
if (nor->read_dummy >= 2) {
num_mode_cycles = 2;
num_dummy_cycles = nor->read_dummy - 2;
} else {
num_mode_cycles = nor->read_dummy;
num_dummy_cycles = 0;
}
memset(&cmd, 0, sizeof(cmd));
cmd.enable.bits.instruction = 1;
cmd.enable.bits.address = nor->addr_width;
cmd.enable.bits.mode = (num_mode_cycles > 0);
cmd.enable.bits.dummy = (num_dummy_cycles > 0);
cmd.enable.bits.data = 1;
cmd.instruction = nor->read_opcode;
cmd.address = (u32)from;
cmd.mode = 0xff; /* This value prevents from entering the 0-4-4 mode */
cmd.num_mode_cycles = num_mode_cycles;
cmd.num_dummy_cycles = num_dummy_cycles;
cmd.rx_buf = read_buf;
cmd.buf_len = len;
ret = atmel_qspi_run_command(aq, &cmd, QSPI_IFR_TFRTYP_TRSFR_READ_MEM,
nor->read_proto);
return (ret < 0) ? ret : len;
}
static int atmel_qspi_init(struct atmel_qspi *aq)
static const struct spi_controller_mem_ops atmel_qspi_mem_ops = {
.supports_op = atmel_qspi_supports_op,
.exec_op = atmel_qspi_exec_op,
.get_name = atmel_qspi_get_name
};
static int atmel_qspi_setup(struct spi_device *spi)
{
struct spi_controller *ctrl = spi->master;
struct atmel_qspi *aq = spi_controller_get_devdata(ctrl);
unsigned long src_rate;
u32 mr, scr, scbr;
u32 scr, scbr;
/* Reset the QSPI controller */
qspi_writel(aq, QSPI_CR, QSPI_CR_SWRST);
if (ctrl->busy)
return -EBUSY;
/* Set the QSPI controller in Serial Memory Mode */
mr = QSPI_MR_NBBITS(8) | QSPI_MR_SSM;
qspi_writel(aq, QSPI_MR, mr);
if (!spi->max_speed_hz)
return -EINVAL;
src_rate = clk_get_rate(aq->clk);
if (!src_rate)
return -EINVAL;
/* Compute the QSPI baudrate */
scbr = DIV_ROUND_UP(src_rate, aq->clk_rate);
scbr = DIV_ROUND_UP(src_rate, spi->max_speed_hz);
if (scbr > 0)
scbr--;
scr = QSPI_SCR_SCBR(scbr);
qspi_writel(aq, QSPI_SCR, scr);
return 0;
}
static int atmel_qspi_init(struct atmel_qspi *aq)
{
/* Reset the QSPI controller */
qspi_writel(aq, QSPI_CR, QSPI_CR_SWRST);
/* Enable the QSPI controller */
qspi_writel(aq, QSPI_CR, QSPI_CR_QSPIEN);
@ -604,38 +408,25 @@ static irqreturn_t atmel_qspi_interrupt(int irq, void *dev_id)
static int atmel_qspi_probe(struct platform_device *pdev)
{
const struct spi_nor_hwcaps hwcaps = {
.mask = SNOR_HWCAPS_READ |
SNOR_HWCAPS_READ_FAST |
SNOR_HWCAPS_READ_1_1_2 |
SNOR_HWCAPS_READ_1_2_2 |
SNOR_HWCAPS_READ_2_2_2 |
SNOR_HWCAPS_READ_1_1_4 |
SNOR_HWCAPS_READ_1_4_4 |
SNOR_HWCAPS_READ_4_4_4 |
SNOR_HWCAPS_PP |
SNOR_HWCAPS_PP_1_1_4 |
SNOR_HWCAPS_PP_1_4_4 |
SNOR_HWCAPS_PP_4_4_4,
};
struct device_node *child, *np = pdev->dev.of_node;
struct spi_controller *ctrl;
struct atmel_qspi *aq;
struct resource *res;
struct spi_nor *nor;
struct mtd_info *mtd;
int irq, err = 0;
if (of_get_child_count(np) != 1)
return -ENODEV;
child = of_get_next_child(np, NULL);
ctrl = spi_alloc_master(&pdev->dev, sizeof(*aq));
if (!ctrl)
return -ENOMEM;
aq = devm_kzalloc(&pdev->dev, sizeof(*aq), GFP_KERNEL);
if (!aq) {
err = -ENOMEM;
goto exit;
}
ctrl->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD | SPI_TX_DUAL | SPI_TX_QUAD;
ctrl->setup = atmel_qspi_setup;
ctrl->bus_num = -1;
ctrl->mem_ops = &atmel_qspi_mem_ops;
ctrl->num_chipselect = 1;
ctrl->dev.of_node = pdev->dev.of_node;
platform_set_drvdata(pdev, ctrl);
aq = spi_controller_get_devdata(ctrl);
platform_set_drvdata(pdev, aq);
init_completion(&aq->cmd_completion);
aq->pdev = pdev;
@ -684,54 +475,30 @@ static int atmel_qspi_probe(struct platform_device *pdev)
if (err)
goto disable_clk;
/* Setup the spi-nor */
nor = &aq->nor;
mtd = &nor->mtd;
nor->dev = &pdev->dev;
spi_nor_set_flash_node(nor, child);
nor->priv = aq;
mtd->priv = nor;
nor->read_reg = atmel_qspi_read_reg;
nor->write_reg = atmel_qspi_write_reg;
nor->read = atmel_qspi_read;
nor->write = atmel_qspi_write;
nor->erase = atmel_qspi_erase;
err = of_property_read_u32(child, "spi-max-frequency", &aq->clk_rate);
if (err < 0)
goto disable_clk;
err = atmel_qspi_init(aq);
if (err)
goto disable_clk;
err = spi_nor_scan(nor, NULL, &hwcaps);
err = spi_register_controller(ctrl);
if (err)
goto disable_clk;
err = mtd_device_register(mtd, NULL, 0);
if (err)
goto disable_clk;
of_node_put(child);
return 0;
disable_clk:
clk_disable_unprepare(aq->clk);
exit:
of_node_put(child);
spi_controller_put(ctrl);
return err;
}
static int atmel_qspi_remove(struct platform_device *pdev)
{
struct atmel_qspi *aq = platform_get_drvdata(pdev);
struct spi_controller *ctrl = platform_get_drvdata(pdev);
struct atmel_qspi *aq = spi_controller_get_devdata(ctrl);
mtd_device_unregister(&aq->nor.mtd);
spi_unregister_controller(ctrl);
qspi_writel(aq, QSPI_CR, QSPI_CR_QSPIDIS);
clk_disable_unprepare(aq->clk);
return 0;
@ -777,5 +544,6 @@ static struct platform_driver atmel_qspi_driver = {
module_platform_driver(atmel_qspi_driver);
MODULE_AUTHOR("Cyrille Pitchen <cyrille.pitchen@atmel.com>");
MODULE_AUTHOR("Piotr Bugalski <bugalski.piotr@gmail.com");
MODULE_DESCRIPTION("Atmel QSPI Controller driver");
MODULE_LICENSE("GPL v2");

269
drivers/spi/spi-mem.c
View File

@ -149,7 +149,7 @@ static bool spi_mem_default_supports_op(struct spi_mem *mem,
spi_check_buswidth_req(mem, op->dummy.buswidth, true))
return false;
if (op->data.nbytes &&
if (op->data.dir != SPI_MEM_NO_DATA &&
spi_check_buswidth_req(mem, op->data.buswidth,
op->data.dir == SPI_MEM_DATA_OUT))
return false;
@ -220,6 +220,44 @@ bool spi_mem_supports_op(struct spi_mem *mem, const struct spi_mem_op *op)
}
EXPORT_SYMBOL_GPL(spi_mem_supports_op);
static int spi_mem_access_start(struct spi_mem *mem)
{
struct spi_controller *ctlr = mem->spi->controller;
/*
* Flush the message queue before executing our SPI memory
* operation to prevent preemption of regular SPI transfers.
*/
spi_flush_queue(ctlr);
if (ctlr->auto_runtime_pm) {
int ret;
ret = pm_runtime_get_sync(ctlr->dev.parent);
if (ret < 0) {
dev_err(&ctlr->dev, "Failed to power device: %d\n",
ret);
return ret;
}
}
mutex_lock(&ctlr->bus_lock_mutex);
mutex_lock(&ctlr->io_mutex);
return 0;
}
static void spi_mem_access_end(struct spi_mem *mem)
{
struct spi_controller *ctlr = mem->spi->controller;
mutex_unlock(&ctlr->io_mutex);
mutex_unlock(&ctlr->bus_lock_mutex);
if (ctlr->auto_runtime_pm)
pm_runtime_put(ctlr->dev.parent);
}
/**
* spi_mem_exec_op() - Execute a memory operation
* @mem: the SPI memory
@ -249,30 +287,13 @@ int spi_mem_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
return -ENOTSUPP;
if (ctlr->mem_ops) {
/*
* Flush the message queue before executing our SPI memory
* operation to prevent preemption of regular SPI transfers.
*/
spi_flush_queue(ctlr);
ret = spi_mem_access_start(mem);
if (ret)
return ret;
if (ctlr->auto_runtime_pm) {
ret = pm_runtime_get_sync(ctlr->dev.parent);
if (ret < 0) {
dev_err(&ctlr->dev,
"Failed to power device: %d\n",
ret);
return ret;
}
}
mutex_lock(&ctlr->bus_lock_mutex);
mutex_lock(&ctlr->io_mutex);
ret = ctlr->mem_ops->exec_op(mem, op);
mutex_unlock(&ctlr->io_mutex);
mutex_unlock(&ctlr->bus_lock_mutex);
if (ctlr->auto_runtime_pm)
pm_runtime_put(ctlr->dev.parent);
spi_mem_access_end(mem);
/*
* Some controllers only optimize specific paths (typically the
@ -418,6 +439,210 @@ int spi_mem_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op)
}
EXPORT_SYMBOL_GPL(spi_mem_adjust_op_size);
static ssize_t spi_mem_no_dirmap_read(struct spi_mem_dirmap_desc *desc,
u64 offs, size_t len, void *buf)
{
struct spi_mem_op op = desc->info.op_tmpl;
int ret;
op.addr.val = desc->info.offset + offs;
op.data.buf.in = buf;
op.data.nbytes = len;
ret = spi_mem_adjust_op_size(desc->mem, &op);
if (ret)
return ret;
ret = spi_mem_exec_op(desc->mem, &op);
if (ret)
return ret;
return op.data.nbytes;
}
static ssize_t spi_mem_no_dirmap_write(struct spi_mem_dirmap_desc *desc,
u64 offs, size_t len, const void *buf)
{
struct spi_mem_op op = desc->info.op_tmpl;
int ret;
op.addr.val = desc->info.offset + offs;
op.data.buf.out = buf;
op.data.nbytes = len;
ret = spi_mem_adjust_op_size(desc->mem, &op);
if (ret)
return ret;
ret = spi_mem_exec_op(desc->mem, &op);
if (ret)
return ret;
return op.data.nbytes;
}
/**
* spi_mem_dirmap_create() - Create a direct mapping descriptor
* @mem: SPI mem device this direct mapping should be created for
* @info: direct mapping information
*
* This function is creating a direct mapping descriptor which can then be used
* to access the memory using spi_mem_dirmap_read() or spi_mem_dirmap_write().
* If the SPI controller driver does not support direct mapping, this function
* fallback to an implementation using spi_mem_exec_op(), so that the caller
* doesn't have to bother implementing a fallback on his own.
*
* Return: a valid pointer in case of success, and ERR_PTR() otherwise.
*/
struct spi_mem_dirmap_desc *
spi_mem_dirmap_create(struct spi_mem *mem,
const struct spi_mem_dirmap_info *info)
{
struct spi_controller *ctlr = mem->spi->controller;
struct spi_mem_dirmap_desc *desc;
int ret = -ENOTSUPP;
/* Make sure the number of address cycles is between 1 and 8 bytes. */
if (!info->op_tmpl.addr.nbytes || info->op_tmpl.addr.nbytes > 8)
return ERR_PTR(-EINVAL);
/* data.dir should either be SPI_MEM_DATA_IN or SPI_MEM_DATA_OUT. */
if (info->op_tmpl.data.dir == SPI_MEM_NO_DATA)
return ERR_PTR(-EINVAL);
desc = kzalloc(sizeof(*desc), GFP_KERNEL);
if (!desc)
return ERR_PTR(-ENOMEM);
desc->mem = mem;
desc->info = *info;
if (ctlr->mem_ops && ctlr->mem_ops->dirmap_create)
ret = ctlr->mem_ops->dirmap_create(desc);
if (ret) {
desc->nodirmap = true;
if (!spi_mem_supports_op(desc->mem, &desc->info.op_tmpl))
ret = -ENOTSUPP;
else
ret = 0;
}
if (ret) {
kfree(desc);
return ERR_PTR(ret);
}
return desc;
}
EXPORT_SYMBOL_GPL(spi_mem_dirmap_create);
/**
* spi_mem_dirmap_destroy() - Destroy a direct mapping descriptor
* @desc: the direct mapping descriptor to destroy
* @info: direct mapping information
*
* This function destroys a direct mapping descriptor previously created by
* spi_mem_dirmap_create().
*/
void spi_mem_dirmap_destroy(struct spi_mem_dirmap_desc *desc)
{
struct spi_controller *ctlr = desc->mem->spi->controller;
if (!desc->nodirmap && ctlr->mem_ops && ctlr->mem_ops->dirmap_destroy)
ctlr->mem_ops->dirmap_destroy(desc);
}
EXPORT_SYMBOL_GPL(spi_mem_dirmap_destroy);
/**
* spi_mem_dirmap_dirmap_read() - Read data through a direct mapping
* @desc: direct mapping descriptor
* @offs: offset to start reading from. Note that this is not an absolute
* offset, but the offset within the direct mapping which already has
* its own offset
* @len: length in bytes
* @buf: destination buffer. This buffer must be DMA-able
*
* This function reads data from a memory device using a direct mapping
* previously instantiated with spi_mem_dirmap_create().
*
* Return: the amount of data read from the memory device or a negative error
* code. Note that the returned size might be smaller than @len, and the caller
* is responsible for calling spi_mem_dirmap_read() again when that happens.
*/
ssize_t spi_mem_dirmap_read(struct spi_mem_dirmap_desc *desc,
u64 offs, size_t len, void *buf)
{
struct spi_controller *ctlr = desc->mem->spi->controller;
ssize_t ret;
if (desc->info.op_tmpl.data.dir != SPI_MEM_DATA_IN)
return -EINVAL;
if (!len)
return 0;
if (desc->nodirmap) {
ret = spi_mem_no_dirmap_read(desc, offs, len, buf);
} else if (ctlr->mem_ops && ctlr->mem_ops->dirmap_read) {
ret = spi_mem_access_start(desc->mem);
if (ret)
return ret;
ret = ctlr->mem_ops->dirmap_read(desc, offs, len, buf);
spi_mem_access_end(desc->mem);
} else {
ret = -ENOTSUPP;
}
return ret;
}
EXPORT_SYMBOL_GPL(spi_mem_dirmap_read);
/**
* spi_mem_dirmap_dirmap_write() - Write data through a direct mapping
* @desc: direct mapping descriptor
* @offs: offset to start writing from. Note that this is not an absolute
* offset, but the offset within the direct mapping which already has
* its own offset
* @len: length in bytes
* @buf: source buffer. This buffer must be DMA-able
*
* This function writes data to a memory device using a direct mapping
* previously instantiated with spi_mem_dirmap_create().
*
* Return: the amount of data written to the memory device or a negative error
* code. Note that the returned size might be smaller than @len, and the caller
* is responsible for calling spi_mem_dirmap_write() again when that happens.
*/
ssize_t spi_mem_dirmap_write(struct spi_mem_dirmap_desc *desc,
u64 offs, size_t len, const void *buf)
{
struct spi_controller *ctlr = desc->mem->spi->controller;
ssize_t ret;
if (desc->info.op_tmpl.data.dir != SPI_MEM_DATA_OUT)
return -EINVAL;
if (!len)
return 0;
if (desc->nodirmap) {
ret = spi_mem_no_dirmap_write(desc, offs, len, buf);
} else if (ctlr->mem_ops && ctlr->mem_ops->dirmap_write) {
ret = spi_mem_access_start(desc->mem);
if (ret)
return ret;
ret = ctlr->mem_ops->dirmap_write(desc, offs, len, buf);
spi_mem_access_end(desc->mem);
} else {
ret = -ENOTSUPP;
}
return ret;
}
EXPORT_SYMBOL_GPL(spi_mem_dirmap_write);
static inline struct spi_mem_driver *to_spi_mem_drv(struct device_driver *drv)
{
return container_of(drv, struct spi_mem_driver, spidrv.driver);

84
include/linux/spi/spi-mem.h
View File

@ -57,10 +57,12 @@
/**
* enum spi_mem_data_dir - describes the direction of a SPI memory data
* transfer from the controller perspective
* @SPI_MEM_NO_DATA: no data transferred
* @SPI_MEM_DATA_IN: data coming from the SPI memory
* @SPI_MEM_DATA_OUT: data sent the SPI memory
* @SPI_MEM_DATA_OUT: data sent to the SPI memory
*/
enum spi_mem_data_dir {
SPI_MEM_NO_DATA,
SPI_MEM_DATA_IN,
SPI_MEM_DATA_OUT,
};
@ -122,6 +124,49 @@ struct spi_mem_op {
.data = __data, \
}
/**
* struct spi_mem_dirmap_info - Direct mapping information
* @op_tmpl: operation template that should be used by the direct mapping when
* the memory device is accessed
* @offset: absolute offset this direct mapping is pointing to
* @length: length in byte of this direct mapping
*
* These information are used by the controller specific implementation to know
* the portion of memory that is directly mapped and the spi_mem_op that should
* be used to access the device.
* A direct mapping is only valid for one direction (read or write) and this
* direction is directly encoded in the ->op_tmpl.data.dir field.
*/
struct spi_mem_dirmap_info {
struct spi_mem_op op_tmpl;
u64 offset;
u64 length;
};
/**
* struct spi_mem_dirmap_desc - Direct mapping descriptor
* @mem: the SPI memory device this direct mapping is attached to
* @info: information passed at direct mapping creation time
* @nodirmap: set to 1 if the SPI controller does not implement
* ->mem_ops->dirmap_create() or when this function returned an
* error. If @nodirmap is true, all spi_mem_dirmap_{read,write}()
* calls will use spi_mem_exec_op() to access the memory. This is a
* degraded mode that allows spi_mem drivers to use the same code
* no matter whether the controller supports direct mapping or not
* @priv: field pointing to controller specific data
*
* Common part of a direct mapping descriptor. This object is created by
* spi_mem_dirmap_create() and controller implementation of ->create_dirmap()
* can create/attach direct mapping resources to the descriptor in the ->priv
* field.
*/
struct spi_mem_dirmap_desc {
struct spi_mem *mem;
struct spi_mem_dirmap_info info;
unsigned int nodirmap;
void *priv;
};
/**
* struct spi_mem - describes a SPI memory device
* @spi: the underlying SPI device
@ -177,10 +222,32 @@ static inline void *spi_mem_get_drvdata(struct spi_mem *mem)
* Note that if the implementation of this function allocates memory
* dynamically, then it should do so with devm_xxx(), as we don't
* have a ->free_name() function.
* @dirmap_create: create a direct mapping descriptor that can later be used to
* access the memory device. This method is optional
* @dirmap_destroy: destroy a memory descriptor previous created by
* ->dirmap_create()
* @dirmap_read: read data from the memory device using the direct mapping
* created by ->dirmap_create(). The function can return less
* data than requested (for example when the request is crossing
* the currently mapped area), and the caller of
* spi_mem_dirmap_read() is responsible for calling it again in
* this case.
* @dirmap_write: write data to the memory device using the direct mapping
* created by ->dirmap_create(). The function can return less
* data than requested (for example when the request is crossing
* the currently mapped area), and the caller of
* spi_mem_dirmap_write() is responsible for calling it again in
* this case.
*
* This interface should be implemented by SPI controllers providing an
* high-level interface to execute SPI memory operation, which is usually the
* case for QSPI controllers.
*
* Note on ->dirmap_{read,write}(): drivers should avoid accessing the direct
* mapping from the CPU because doing that can stall the CPU waiting for the
* SPI mem transaction to finish, and this will make real-time maintainers
* unhappy and might make your system less reactive. Instead, drivers should
* use DMA to access this direct mapping.
*/
struct spi_controller_mem_ops {
int (*adjust_op_size)(struct spi_mem *mem, struct spi_mem_op *op);
@ -189,6 +256,12 @@ struct spi_controller_mem_ops {
int (*exec_op)(struct spi_mem *mem,
const struct spi_mem_op *op);
const char *(*get_name)(struct spi_mem *mem);
int (*dirmap_create)(struct spi_mem_dirmap_desc *desc);
void (*dirmap_destroy)(struct spi_mem_dirmap_desc *desc);
ssize_t (*dirmap_read)(struct spi_mem_dirmap_desc *desc,
u64 offs, size_t len, void *buf);
ssize_t (*dirmap_write)(struct spi_mem_dirmap_desc *desc,
u64 offs, size_t len, const void *buf);
};
/**
@ -249,6 +322,15 @@ int spi_mem_exec_op(struct spi_mem *mem,
const char *spi_mem_get_name(struct spi_mem *mem);
struct spi_mem_dirmap_desc *
spi_mem_dirmap_create(struct spi_mem *mem,
const struct spi_mem_dirmap_info *info);
void spi_mem_dirmap_destroy(struct spi_mem_dirmap_desc *desc);
ssize_t spi_mem_dirmap_read(struct spi_mem_dirmap_desc *desc,
u64 offs, size_t len, void *buf);
ssize_t spi_mem_dirmap_write(struct spi_mem_dirmap_desc *desc,
u64 offs, size_t len, const void *buf);
int spi_mem_driver_register_with_owner(struct spi_mem_driver *drv,
struct module *owner);