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mtd: spi-nor: stm32: remove the driver as it was replaced by spi-stm32-qspi.c

Browse Source 
There's a new driver using the SPI memory interface of the
SPI framework at spi/spi-stm32-qspi.c, which can be used
together with m25p80.c to replace the functionality of
this SPI NOR driver.

The "new" driver uses the same dt properties and not affects
the legacy compatibility.

Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
This commit is contained in:
Ludovic Barre 2019-05-07 11:16:38 +02:00 committed by Tudor Ambarus
parent a188339ca5
commit df6bd6c002
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GPG Key ID: 4B554F47A58D14E9
4 changed files with 0 additions and 771 deletions
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43
Documentation/devicetree/bindings/mtd/stm32-quadspi.txt
View File

@ -1,43 +0,0 @@
* STMicroelectronics Quad Serial Peripheral Interface(QuadSPI)
Required properties:
- compatible: should be "st,stm32f469-qspi"
- reg: the first contains the register location and length.
the second contains the memory mapping address and length
- reg-names: should contain the reg names "qspi" "qspi_mm"
- interrupts: should contain the interrupt for the device
- clocks: the phandle of the clock needed by the QSPI controller
- A pinctrl must be defined to set pins in mode of operation for QSPI transfer
Optional properties:
- resets: must contain the phandle to the reset controller.
A spi flash must be a child of the nor_flash node and could have some
properties. Also see jedec,spi-nor.txt.
Required properties:
- reg: chip-Select number (QSPI controller may connect 2 nor flashes)
- spi-max-frequency: max frequency of spi bus
Optional property:
- spi-rx-bus-width: see ../spi/spi-bus.txt for the description
Example:
qspi: spi@a0001000 {
compatible = "st,stm32f469-qspi";
reg = <0xa0001000 0x1000>, <0x90000000 0x10000000>;
reg-names = "qspi", "qspi_mm";
interrupts = <91>;
resets = <&rcc STM32F4_AHB3_RESET(QSPI)>;
clocks = <&rcc 0 STM32F4_AHB3_CLOCK(QSPI)>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_qspi0>;
flash@0 {
reg = <0>;
spi-rx-bus-width = <4>;
spi-max-frequency = <108000000>;
...
};
};

7
drivers/mtd/spi-nor/Kconfig
View File

@ -104,11 +104,4 @@ config SPI_INTEL_SPI_PLATFORM
To compile this driver as a module, choose M here: the module
will be called intel-spi-platform.
config SPI_STM32_QUADSPI
tristate "STM32 Quad SPI controller"
depends on ARCH_STM32 || COMPILE_TEST
help
This enables support for the STM32 Quad SPI controller.
We only connect the NOR to this controller.
endif # MTD_SPI_NOR

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

@ -8,4 +8,3 @@ obj-$(CONFIG_SPI_NXP_SPIFI) += nxp-spifi.o
obj-$(CONFIG_SPI_INTEL_SPI) += intel-spi.o
obj-$(CONFIG_SPI_INTEL_SPI_PCI) += intel-spi-pci.o
obj-$(CONFIG_SPI_INTEL_SPI_PLATFORM) += intel-spi-platform.o
obj-$(CONFIG_SPI_STM32_QUADSPI) += stm32-quadspi.o

720
drivers/mtd/spi-nor/stm32-quadspi.c
View File

@ -1,720 +0,0 @@
/*
* Driver for stm32 quadspi controller
*
* Copyright (C) 2017, STMicroelectronics - All Rights Reserved
* Author(s): Ludovic Barre author <ludovic.barre@st.com>.
*
* License terms: GPL V2.0.
*
* 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 published by
* the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* This program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/clk.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/spi-nor.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/reset.h>
#include <linux/sizes.h>
#define QUADSPI_CR 0x00
#define CR_EN BIT(0)
#define CR_ABORT BIT(1)
#define CR_DMAEN BIT(2)
#define CR_TCEN BIT(3)
#define CR_SSHIFT BIT(4)
#define CR_DFM BIT(6)
#define CR_FSEL BIT(7)
#define CR_FTHRES_SHIFT 8
#define CR_FTHRES_MASK GENMASK(12, 8)
#define CR_FTHRES(n) (((n) << CR_FTHRES_SHIFT) & CR_FTHRES_MASK)
#define CR_TEIE BIT(16)
#define CR_TCIE BIT(17)
#define CR_FTIE BIT(18)
#define CR_SMIE BIT(19)
#define CR_TOIE BIT(20)
#define CR_PRESC_SHIFT 24
#define CR_PRESC_MASK GENMASK(31, 24)
#define CR_PRESC(n) (((n) << CR_PRESC_SHIFT) & CR_PRESC_MASK)
#define QUADSPI_DCR 0x04
#define DCR_CSHT_SHIFT 8
#define DCR_CSHT_MASK GENMASK(10, 8)
#define DCR_CSHT(n) (((n) << DCR_CSHT_SHIFT) & DCR_CSHT_MASK)
#define DCR_FSIZE_SHIFT 16
#define DCR_FSIZE_MASK GENMASK(20, 16)
#define DCR_FSIZE(n) (((n) << DCR_FSIZE_SHIFT) & DCR_FSIZE_MASK)
#define QUADSPI_SR 0x08
#define SR_TEF BIT(0)
#define SR_TCF BIT(1)
#define SR_FTF BIT(2)
#define SR_SMF BIT(3)
#define SR_TOF BIT(4)
#define SR_BUSY BIT(5)
#define SR_FLEVEL_SHIFT 8
#define SR_FLEVEL_MASK GENMASK(13, 8)
#define QUADSPI_FCR 0x0c
#define FCR_CTCF BIT(1)
#define QUADSPI_DLR 0x10
#define QUADSPI_CCR 0x14
#define CCR_INST_SHIFT 0
#define CCR_INST_MASK GENMASK(7, 0)
#define CCR_INST(n) (((n) << CCR_INST_SHIFT) & CCR_INST_MASK)
#define CCR_IMODE_NONE (0U << 8)
#define CCR_IMODE_1 (1U << 8)
#define CCR_IMODE_2 (2U << 8)
#define CCR_IMODE_4 (3U << 8)
#define CCR_ADMODE_NONE (0U << 10)
#define CCR_ADMODE_1 (1U << 10)
#define CCR_ADMODE_2 (2U << 10)
#define CCR_ADMODE_4 (3U << 10)
#define CCR_ADSIZE_SHIFT 12
#define CCR_ADSIZE_MASK GENMASK(13, 12)
#define CCR_ADSIZE(n) (((n) << CCR_ADSIZE_SHIFT) & CCR_ADSIZE_MASK)
#define CCR_ABMODE_NONE (0U << 14)
#define CCR_ABMODE_1 (1U << 14)
#define CCR_ABMODE_2 (2U << 14)
#define CCR_ABMODE_4 (3U << 14)
#define CCR_ABSIZE_8 (0U << 16)
#define CCR_ABSIZE_16 (1U << 16)
#define CCR_ABSIZE_24 (2U << 16)
#define CCR_ABSIZE_32 (3U << 16)
#define CCR_DCYC_SHIFT 18
#define CCR_DCYC_MASK GENMASK(22, 18)
#define CCR_DCYC(n) (((n) << CCR_DCYC_SHIFT) & CCR_DCYC_MASK)
#define CCR_DMODE_NONE (0U << 24)
#define CCR_DMODE_1 (1U << 24)
#define CCR_DMODE_2 (2U << 24)
#define CCR_DMODE_4 (3U << 24)
#define CCR_FMODE_INDW (0U << 26)
#define CCR_FMODE_INDR (1U << 26)
#define CCR_FMODE_APM (2U << 26)
#define CCR_FMODE_MM (3U << 26)
#define QUADSPI_AR 0x18
#define QUADSPI_ABR 0x1c
#define QUADSPI_DR 0x20
#define QUADSPI_PSMKR 0x24
#define QUADSPI_PSMAR 0x28
#define QUADSPI_PIR 0x2c
#define QUADSPI_LPTR 0x30
#define LPTR_DFT_TIMEOUT 0x10
#define FSIZE_VAL(size) (__fls(size) - 1)
#define STM32_MAX_MMAP_SZ SZ_256M
#define STM32_MAX_NORCHIP 2
#define STM32_QSPI_FIFO_SZ 32
#define STM32_QSPI_FIFO_TIMEOUT_US 30000
#define STM32_QSPI_BUSY_TIMEOUT_US 100000
struct stm32_qspi_flash {
struct spi_nor nor;
struct stm32_qspi *qspi;
u32 cs;
u32 fsize;
u32 presc;
u32 read_mode;
bool registered;
u32 prefetch_limit;
};
struct stm32_qspi {
struct device *dev;
void __iomem *io_base;
void __iomem *mm_base;
resource_size_t mm_size;
u32 nor_num;
struct clk *clk;
u32 clk_rate;
struct stm32_qspi_flash flash[STM32_MAX_NORCHIP];
struct completion cmd_completion;
/*
* to protect device configuration, could be different between
* 2 flash access (bk1, bk2)
*/
struct mutex lock;
};
struct stm32_qspi_cmd {
u8 addr_width;
u8 dummy;
bool tx_data;
u8 opcode;
u32 framemode;
u32 qspimode;
u32 addr;
size_t len;
void *buf;
};
static int stm32_qspi_wait_cmd(struct stm32_qspi *qspi)
{
u32 cr;
int err = 0;
if (readl_relaxed(qspi->io_base + QUADSPI_SR) & SR_TCF)
return 0;
reinit_completion(&qspi->cmd_completion);
cr = readl_relaxed(qspi->io_base + QUADSPI_CR);
writel_relaxed(cr | CR_TCIE, qspi->io_base + QUADSPI_CR);
if (!wait_for_completion_interruptible_timeout(&qspi->cmd_completion,
msecs_to_jiffies(1000)))
err = -ETIMEDOUT;
writel_relaxed(cr, qspi->io_base + QUADSPI_CR);
return err;
}
static int stm32_qspi_wait_nobusy(struct stm32_qspi *qspi)
{
u32 sr;
return readl_relaxed_poll_timeout(qspi->io_base + QUADSPI_SR, sr,
!(sr & SR_BUSY), 10,
STM32_QSPI_BUSY_TIMEOUT_US);
}
static void stm32_qspi_set_framemode(struct spi_nor *nor,
struct stm32_qspi_cmd *cmd, bool read)
{
u32 dmode = CCR_DMODE_1;
cmd->framemode = CCR_IMODE_1;
if (read) {
switch (nor->read_proto) {
default:
case SNOR_PROTO_1_1_1:
dmode = CCR_DMODE_1;
break;
case SNOR_PROTO_1_1_2:
dmode = CCR_DMODE_2;
break;
case SNOR_PROTO_1_1_4:
dmode = CCR_DMODE_4;
break;
}
}
cmd->framemode |= cmd->tx_data ? dmode : 0;
cmd->framemode |= cmd->addr_width ? CCR_ADMODE_1 : 0;
}
static void stm32_qspi_read_fifo(u8 *val, void __iomem *addr)
{
*val = readb_relaxed(addr);
}
static void stm32_qspi_write_fifo(u8 *val, void __iomem *addr)
{
writeb_relaxed(*val, addr);
}
static int stm32_qspi_tx_poll(struct stm32_qspi *qspi,
const struct stm32_qspi_cmd *cmd)
{
void (*tx_fifo)(u8 *, void __iomem *);
u32 len = cmd->len, sr;
u8 *buf = cmd->buf;
int ret;
if (cmd->qspimode == CCR_FMODE_INDW)
tx_fifo = stm32_qspi_write_fifo;
else
tx_fifo = stm32_qspi_read_fifo;
while (len--) {
ret = readl_relaxed_poll_timeout(qspi->io_base + QUADSPI_SR,
sr, (sr & SR_FTF), 10,
STM32_QSPI_FIFO_TIMEOUT_US);
if (ret) {
dev_err(qspi->dev, "fifo timeout (stat:%#x)\n", sr);
return ret;
}
tx_fifo(buf++, qspi->io_base + QUADSPI_DR);
}
return 0;
}
static int stm32_qspi_tx_mm(struct stm32_qspi *qspi,
const struct stm32_qspi_cmd *cmd)
{
memcpy_fromio(cmd->buf, qspi->mm_base + cmd->addr, cmd->len);
return 0;
}
static int stm32_qspi_tx(struct stm32_qspi *qspi,
const struct stm32_qspi_cmd *cmd)
{
if (!cmd->tx_data)
return 0;
if (cmd->qspimode == CCR_FMODE_MM)
return stm32_qspi_tx_mm(qspi, cmd);
return stm32_qspi_tx_poll(qspi, cmd);
}
static int stm32_qspi_send(struct stm32_qspi_flash *flash,
const struct stm32_qspi_cmd *cmd)
{
struct stm32_qspi *qspi = flash->qspi;
u32 ccr, dcr, cr;
u32 last_byte;
int err;
err = stm32_qspi_wait_nobusy(qspi);
if (err)
goto abort;
dcr = readl_relaxed(qspi->io_base + QUADSPI_DCR) & ~DCR_FSIZE_MASK;
dcr |= DCR_FSIZE(flash->fsize);
writel_relaxed(dcr, qspi->io_base + QUADSPI_DCR);
cr = readl_relaxed(qspi->io_base + QUADSPI_CR);
cr &= ~CR_PRESC_MASK & ~CR_FSEL;
cr |= CR_PRESC(flash->presc);
cr |= flash->cs ? CR_FSEL : 0;
writel_relaxed(cr, qspi->io_base + QUADSPI_CR);
if (cmd->tx_data)
writel_relaxed(cmd->len - 1, qspi->io_base + QUADSPI_DLR);
ccr = cmd->framemode | cmd->qspimode;
if (cmd->dummy)
ccr |= CCR_DCYC(cmd->dummy);
if (cmd->addr_width)
ccr |= CCR_ADSIZE(cmd->addr_width - 1);
ccr |= CCR_INST(cmd->opcode);
writel_relaxed(ccr, qspi->io_base + QUADSPI_CCR);
if (cmd->addr_width && cmd->qspimode != CCR_FMODE_MM)
writel_relaxed(cmd->addr, qspi->io_base + QUADSPI_AR);
err = stm32_qspi_tx(qspi, cmd);
if (err)
goto abort;
if (cmd->qspimode != CCR_FMODE_MM) {
err = stm32_qspi_wait_cmd(qspi);
if (err)
goto abort;
writel_relaxed(FCR_CTCF, qspi->io_base + QUADSPI_FCR);
} else {
last_byte = cmd->addr + cmd->len;
if (last_byte > flash->prefetch_limit)
goto abort;
}
return err;
abort:
cr = readl_relaxed(qspi->io_base + QUADSPI_CR) | CR_ABORT;
writel_relaxed(cr, qspi->io_base + QUADSPI_CR);
if (err)
dev_err(qspi->dev, "%s abort err:%d\n", __func__, err);
return err;
}
static int stm32_qspi_read_reg(struct spi_nor *nor,
u8 opcode, u8 *buf, int len)
{
struct stm32_qspi_flash *flash = nor->priv;
struct device *dev = flash->qspi->dev;
struct stm32_qspi_cmd cmd;
dev_dbg(dev, "read_reg: cmd:%#.2x buf:%pK len:%#x\n", opcode, buf, len);
memset(&cmd, 0, sizeof(cmd));
cmd.opcode = opcode;
cmd.tx_data = true;
cmd.len = len;
cmd.buf = buf;
cmd.qspimode = CCR_FMODE_INDR;
stm32_qspi_set_framemode(nor, &cmd, false);
return stm32_qspi_send(flash, &cmd);
}
static int stm32_qspi_write_reg(struct spi_nor *nor, u8 opcode,
u8 *buf, int len)
{
struct stm32_qspi_flash *flash = nor->priv;
struct device *dev = flash->qspi->dev;
struct stm32_qspi_cmd cmd;
dev_dbg(dev, "write_reg: cmd:%#.2x buf:%pK len:%#x\n", opcode, buf, len);
memset(&cmd, 0, sizeof(cmd));
cmd.opcode = opcode;
cmd.tx_data = !!(buf && len > 0);
cmd.len = len;
cmd.buf = buf;
cmd.qspimode = CCR_FMODE_INDW;
stm32_qspi_set_framemode(nor, &cmd, false);
return stm32_qspi_send(flash, &cmd);
}
static ssize_t stm32_qspi_read(struct spi_nor *nor, loff_t from, size_t len,
u_char *buf)
{
struct stm32_qspi_flash *flash = nor->priv;
struct stm32_qspi *qspi = flash->qspi;
struct stm32_qspi_cmd cmd;
int err;
dev_dbg(qspi->dev, "read(%#.2x): buf:%pK from:%#.8x len:%#zx\n",
nor->read_opcode, buf, (u32)from, len);
memset(&cmd, 0, sizeof(cmd));
cmd.opcode = nor->read_opcode;
cmd.addr_width = nor->addr_width;
cmd.addr = (u32)from;
cmd.tx_data = true;
cmd.dummy = nor->read_dummy;
cmd.len = len;
cmd.buf = buf;
cmd.qspimode = flash->read_mode;
stm32_qspi_set_framemode(nor, &cmd, true);
err = stm32_qspi_send(flash, &cmd);
return err ? err : len;
}
static ssize_t stm32_qspi_write(struct spi_nor *nor, loff_t to, size_t len,
const u_char *buf)
{
struct stm32_qspi_flash *flash = nor->priv;
struct device *dev = flash->qspi->dev;
struct stm32_qspi_cmd cmd;
int err;
dev_dbg(dev, "write(%#.2x): buf:%p to:%#.8x len:%#zx\n",
nor->program_opcode, buf, (u32)to, len);
memset(&cmd, 0, sizeof(cmd));
cmd.opcode = nor->program_opcode;
cmd.addr_width = nor->addr_width;
cmd.addr = (u32)to;
cmd.tx_data = true;
cmd.len = len;
cmd.buf = (void *)buf;
cmd.qspimode = CCR_FMODE_INDW;
stm32_qspi_set_framemode(nor, &cmd, false);
err = stm32_qspi_send(flash, &cmd);
return err ? err : len;
}
static int stm32_qspi_erase(struct spi_nor *nor, loff_t offs)
{
struct stm32_qspi_flash *flash = nor->priv;
struct device *dev = flash->qspi->dev;
struct stm32_qspi_cmd cmd;
dev_dbg(dev, "erase(%#.2x):offs:%#x\n", nor->erase_opcode, (u32)offs);
memset(&cmd, 0, sizeof(cmd));
cmd.opcode = nor->erase_opcode;
cmd.addr_width = nor->addr_width;
cmd.addr = (u32)offs;
cmd.qspimode = CCR_FMODE_INDW;
stm32_qspi_set_framemode(nor, &cmd, false);
return stm32_qspi_send(flash, &cmd);
}
static irqreturn_t stm32_qspi_irq(int irq, void *dev_id)
{
struct stm32_qspi *qspi = (struct stm32_qspi *)dev_id;
u32 cr, sr, fcr = 0;
cr = readl_relaxed(qspi->io_base + QUADSPI_CR);
sr = readl_relaxed(qspi->io_base + QUADSPI_SR);
if ((cr & CR_TCIE) && (sr & SR_TCF)) {
/* tx complete */
fcr |= FCR_CTCF;
complete(&qspi->cmd_completion);
} else {
dev_info_ratelimited(qspi->dev, "spurious interrupt\n");
}
writel_relaxed(fcr, qspi->io_base + QUADSPI_FCR);
return IRQ_HANDLED;
}
static int stm32_qspi_prep(struct spi_nor *nor, enum spi_nor_ops ops)
{
struct stm32_qspi_flash *flash = nor->priv;
struct stm32_qspi *qspi = flash->qspi;
mutex_lock(&qspi->lock);
return 0;
}
static void stm32_qspi_unprep(struct spi_nor *nor, enum spi_nor_ops ops)
{
struct stm32_qspi_flash *flash = nor->priv;
struct stm32_qspi *qspi = flash->qspi;
mutex_unlock(&qspi->lock);
}
static int stm32_qspi_flash_setup(struct stm32_qspi *qspi,
struct device_node *np)
{
struct spi_nor_hwcaps hwcaps = {
.mask = SNOR_HWCAPS_READ |
SNOR_HWCAPS_READ_FAST |
SNOR_HWCAPS_PP,
};
u32 width, presc, cs_num, max_rate = 0;
struct stm32_qspi_flash *flash;
struct mtd_info *mtd;
int ret;
of_property_read_u32(np, "reg", &cs_num);
if (cs_num >= STM32_MAX_NORCHIP)
return -EINVAL;
of_property_read_u32(np, "spi-max-frequency", &max_rate);
if (!max_rate)
return -EINVAL;
presc = DIV_ROUND_UP(qspi->clk_rate, max_rate) - 1;
if (of_property_read_u32(np, "spi-rx-bus-width", &width))
width = 1;
if (width == 4)
hwcaps.mask |= SNOR_HWCAPS_READ_1_1_4;
else if (width == 2)
hwcaps.mask |= SNOR_HWCAPS_READ_1_1_2;
else if (width != 1)
return -EINVAL;
flash = &qspi->flash[cs_num];
flash->qspi = qspi;
flash->cs = cs_num;
flash->presc = presc;
flash->nor.dev = qspi->dev;
spi_nor_set_flash_node(&flash->nor, np);
flash->nor.priv = flash;
mtd = &flash->nor.mtd;
flash->nor.read = stm32_qspi_read;
flash->nor.write = stm32_qspi_write;
flash->nor.erase = stm32_qspi_erase;
flash->nor.read_reg = stm32_qspi_read_reg;
flash->nor.write_reg = stm32_qspi_write_reg;
flash->nor.prepare = stm32_qspi_prep;
flash->nor.unprepare = stm32_qspi_unprep;
writel_relaxed(LPTR_DFT_TIMEOUT, qspi->io_base + QUADSPI_LPTR);
writel_relaxed(CR_PRESC(presc) | CR_FTHRES(3) | CR_TCEN | CR_SSHIFT
| CR_EN, qspi->io_base + QUADSPI_CR);
/*
* in stm32 qspi controller, QUADSPI_DCR register has a fsize field
* which define the size of nor flash.
* if fsize is NULL, the controller can't sent spi-nor command.
* set a temporary value just to discover the nor flash with
* "spi_nor_scan". After, the right value (mtd->size) can be set.
*/
flash->fsize = FSIZE_VAL(SZ_1K);
ret = spi_nor_scan(&flash->nor, NULL, &hwcaps);
if (ret) {
dev_err(qspi->dev, "device scan failed\n");
return ret;
}
flash->fsize = FSIZE_VAL(mtd->size);
flash->prefetch_limit = mtd->size - STM32_QSPI_FIFO_SZ;
flash->read_mode = CCR_FMODE_MM;
if (mtd->size > qspi->mm_size)
flash->read_mode = CCR_FMODE_INDR;
writel_relaxed(DCR_CSHT(1), qspi->io_base + QUADSPI_DCR);
ret = mtd_device_register(mtd, NULL, 0);
if (ret) {
dev_err(qspi->dev, "mtd device parse failed\n");
return ret;
}
flash->registered = true;
dev_dbg(qspi->dev, "read mm:%s cs:%d bus:%d\n",
flash->read_mode == CCR_FMODE_MM ? "yes" : "no", cs_num, width);
return 0;
}
static void stm32_qspi_mtd_free(struct stm32_qspi *qspi)
{
int i;
for (i = 0; i < STM32_MAX_NORCHIP; i++)
if (qspi->flash[i].registered)
mtd_device_unregister(&qspi->flash[i].nor.mtd);
}
static int stm32_qspi_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *flash_np;
struct reset_control *rstc;
struct stm32_qspi *qspi;
struct resource *res;
int ret, irq;
qspi = devm_kzalloc(dev, sizeof(*qspi), GFP_KERNEL);
if (!qspi)
return -ENOMEM;
qspi->nor_num = of_get_child_count(dev->of_node);
if (!qspi->nor_num || qspi->nor_num > STM32_MAX_NORCHIP)
return -ENODEV;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qspi");
qspi->io_base = devm_ioremap_resource(dev, res);
if (IS_ERR(qspi->io_base))
return PTR_ERR(qspi->io_base);
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "qspi_mm");
qspi->mm_base = devm_ioremap_resource(dev, res);
if (IS_ERR(qspi->mm_base))
return PTR_ERR(qspi->mm_base);
qspi->mm_size = resource_size(res);
irq = platform_get_irq(pdev, 0);
ret = devm_request_irq(dev, irq, stm32_qspi_irq, 0,
dev_name(dev), qspi);
if (ret) {
dev_err(dev, "failed to request irq\n");
return ret;
}
init_completion(&qspi->cmd_completion);
qspi->clk = devm_clk_get(dev, NULL);
if (IS_ERR(qspi->clk))
return PTR_ERR(qspi->clk);
qspi->clk_rate = clk_get_rate(qspi->clk);
if (!qspi->clk_rate)
return -EINVAL;
ret = clk_prepare_enable(qspi->clk);
if (ret) {
dev_err(dev, "can not enable the clock\n");
return ret;
}
rstc = devm_reset_control_get_exclusive(dev, NULL);
if (!IS_ERR(rstc)) {
reset_control_assert(rstc);
udelay(2);
reset_control_deassert(rstc);
}
qspi->dev = dev;
platform_set_drvdata(pdev, qspi);
mutex_init(&qspi->lock);
for_each_available_child_of_node(dev->of_node, flash_np) {
ret = stm32_qspi_flash_setup(qspi, flash_np);
if (ret) {
dev_err(dev, "unable to setup flash chip\n");
goto err_flash;
}
}
return 0;
err_flash:
mutex_destroy(&qspi->lock);
stm32_qspi_mtd_free(qspi);
clk_disable_unprepare(qspi->clk);
return ret;
}
static int stm32_qspi_remove(struct platform_device *pdev)
{
struct stm32_qspi *qspi = platform_get_drvdata(pdev);
/* disable qspi */
writel_relaxed(0, qspi->io_base + QUADSPI_CR);
stm32_qspi_mtd_free(qspi);
mutex_destroy(&qspi->lock);
clk_disable_unprepare(qspi->clk);
return 0;
}
static const struct of_device_id stm32_qspi_match[] = {
{.compatible = "st,stm32f469-qspi"},
{}
};
MODULE_DEVICE_TABLE(of, stm32_qspi_match);
static struct platform_driver stm32_qspi_driver = {
.probe = stm32_qspi_probe,
.remove = stm32_qspi_remove,
.driver = {
.name = "stm32-quadspi",
.of_match_table = stm32_qspi_match,
},
};
module_platform_driver(stm32_qspi_driver);
MODULE_AUTHOR("Ludovic Barre <ludovic.barre@st.com>");
MODULE_DESCRIPTION("STMicroelectronics STM32 quad spi driver");
MODULE_LICENSE("GPL v2");