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Merge remote-tracking branches 'spi/topic/fsl-dspi', 'spi/topic/fsl-espi', 'spi/topic/gpio', 'spi/topic/img-spfi' and 'spi/topic/meson' into spi-next

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This commit is contained in:
Mark Brown 2014-12-08 12:17:15 +00:00
parent 3bcfca617a 409851c38c 1a7e06d260 cfb4bbd8fb deba25800a 1327ecd47f
commit dcf695b5f3
13 changed files with 1365 additions and 110 deletions
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6
Documentation/devicetree/bindings/spi/spi-gpio.txt
View file

@ -8,8 +8,10 @@ Required properties:
- gpio-sck: GPIO spec for the SCK line to use
- gpio-miso: GPIO spec for the MISO line to use
- gpio-mosi: GPIO spec for the MOSI line to use
- cs-gpios: GPIOs to use for chipselect lines
- num-chipselects: number of chipselect lines
- cs-gpios: GPIOs to use for chipselect lines.
Not needed if num-chipselects = <0>.
- num-chipselects: Number of chipselect lines. Should be <0> if a single device
with no chip select is connected.
Example:

37
Documentation/devicetree/bindings/spi/spi-img-spfi.txt Normal file
View file

@ -0,0 +1,37 @@
IMG Synchronous Peripheral Flash Interface (SPFI) controller
Required properties:
- compatible: Must be "img,spfi".
- reg: Must contain the base address and length of the SPFI registers.
- interrupts: Must contain the SPFI interrupt.
- clocks: Must contain an entry for each entry in clock-names.
See ../clock/clock-bindings.txt for details.
- clock-names: Must include the following entries:
- spfi: SPI operating clock
- sys: SPI system interface clock
- dmas: Must contain an entry for each entry in dma-names.
See ../dma/dma.txt for details.
- dma-names: Must include the following entries:
- rx
- tx
- #address-cells: Must be 1.
- #size-cells: Must be 0.
Optional properties:
- img,supports-quad-mode: Should be set if the interface supports quad mode
SPI transfers.
Example:
spi@18100f00 {
compatible = "img,spfi";
reg = <0x18100f00 0x100>;
interrupts = <GIC_SHARED 22 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&spi_clk>, <&system_clk>;
clock-names = "spfi", "sys";
dmas = <&mdc 9 0xffffffff 0>, <&mdc 10 0xffffffff 0>;
dma-names = "rx", "tx";
#address-cells = <1>;
#size-cells = <0>;
};

22
Documentation/devicetree/bindings/spi/spi-meson.txt Normal file
View file

@ -0,0 +1,22 @@
Amlogic Meson SPI controllers
* SPIFC (SPI Flash Controller)
The Meson SPIFC is a controller optimized for communication with SPI
NOR memories, without DMA support and a 64-byte unified transmit /
receive buffer.
Required properties:
- compatible: should be "amlogic,meson6-spifc"
- reg: physical base address and length of the controller registers
- clocks: phandle of the input clock for the baud rate generator
- #address-cells: should be 1
- #size-cells: should be 0
spi@c1108c80 {
compatible = "amlogic,meson6-spifc";
reg = <0xc1108c80 0x80>;
clocks = <&clk81>;
#address-cells = <1>;
#size-cells = <0>;
};

15
drivers/spi/Kconfig
View file

@ -225,6 +225,13 @@ config SPI_GPIO
GPIO operations, you should be able to leverage that for better
speed with a custom version of this driver; see the source code.
config SPI_IMG_SPFI
tristate "IMG SPFI controller"
depends on MIPS || COMPILE_TEST
help
This enables support for the SPFI master controller found on
IMG SoCs.
config SPI_IMX
tristate "Freescale i.MX SPI controllers"
depends on ARCH_MXC || COMPILE_TEST
@ -301,6 +308,14 @@ config SPI_FSL_ESPI
From MPC8536, 85xx platform uses the controller, and all P10xx,
P20xx, P30xx,P40xx, P50xx uses this controller.
config SPI_MESON_SPIFC
tristate "Amlogic Meson SPIFC controller"
depends on ARCH_MESON || COMPILE_TEST
select REGMAP_MMIO
help
This enables master mode support for the SPIFC (SPI flash
controller) available in Amlogic Meson SoCs.
config SPI_OC_TINY
tristate "OpenCores tiny SPI"
depends on GPIOLIB

2
drivers/spi/Makefile
View file

@ -40,8 +40,10 @@ obj-$(CONFIG_SPI_FSL_LIB) += spi-fsl-lib.o
obj-$(CONFIG_SPI_FSL_ESPI) += spi-fsl-espi.o
obj-$(CONFIG_SPI_FSL_SPI) += spi-fsl-spi.o
obj-$(CONFIG_SPI_GPIO) += spi-gpio.o
obj-$(CONFIG_SPI_IMG_SPFI) += spi-img-spfi.o
obj-$(CONFIG_SPI_IMX) += spi-imx.o
obj-$(CONFIG_SPI_LM70_LLP) += spi-lm70llp.o
obj-$(CONFIG_SPI_MESON_SPIFC) += spi-meson-spifc.o
obj-$(CONFIG_SPI_MPC512x_PSC) += spi-mpc512x-psc.o
obj-$(CONFIG_SPI_MPC52xx_PSC) += spi-mpc52xx-psc.o
obj-$(CONFIG_SPI_MPC52xx) += spi-mpc52xx.o

3
drivers/spi/spi-fsl-dspi.c
View file

@ -438,7 +438,7 @@ static int dspi_resume(struct device *dev)
static SIMPLE_DEV_PM_OPS(dspi_pm, dspi_suspend, dspi_resume);
static struct regmap_config dspi_regmap_config = {
static const struct regmap_config dspi_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
@ -492,7 +492,6 @@ static int dspi_probe(struct platform_device *pdev)
goto out_master_put;
}
dspi_regmap_config.lock_arg = dspi;
dspi->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "dspi", base,
&dspi_regmap_config);
if (IS_ERR(dspi->regmap)) {

59
drivers/spi/spi-fsl-espi.c
View file

@ -411,7 +411,8 @@ static void fsl_espi_rw_trans(struct spi_message *m,
kfree(local_buf);
}
static void fsl_espi_do_one_msg(struct spi_message *m)
static int fsl_espi_do_one_msg(struct spi_master *master,
struct spi_message *m)
{
struct spi_transfer *t;
u8 *rx_buf = NULL;
@ -441,8 +442,8 @@ static void fsl_espi_do_one_msg(struct spi_message *m)
m->actual_length = espi_trans.actual_length;
m->status = espi_trans.status;
if (m->complete)
m->complete(m->context);
spi_finalize_current_message(master);
return 0;
}
static int fsl_espi_setup(struct spi_device *spi)
@ -587,6 +588,38 @@ static void fsl_espi_remove(struct mpc8xxx_spi *mspi)
iounmap(mspi->reg_base);
}
static int fsl_espi_suspend(struct spi_master *master)
{
struct mpc8xxx_spi *mpc8xxx_spi;
struct fsl_espi_reg *reg_base;
u32 regval;
mpc8xxx_spi = spi_master_get_devdata(master);
reg_base = mpc8xxx_spi->reg_base;
regval = mpc8xxx_spi_read_reg(&reg_base->mode);
regval &= ~SPMODE_ENABLE;
mpc8xxx_spi_write_reg(&reg_base->mode, regval);
return 0;
}
static int fsl_espi_resume(struct spi_master *master)
{
struct mpc8xxx_spi *mpc8xxx_spi;
struct fsl_espi_reg *reg_base;
u32 regval;
mpc8xxx_spi = spi_master_get_devdata(master);
reg_base = mpc8xxx_spi->reg_base;
regval = mpc8xxx_spi_read_reg(&reg_base->mode);
regval |= SPMODE_ENABLE;
mpc8xxx_spi_write_reg(&reg_base->mode, regval);
return 0;
}
static struct spi_master * fsl_espi_probe(struct device *dev,
struct resource *mem, unsigned int irq)
{
@ -607,16 +640,16 @@ static struct spi_master * fsl_espi_probe(struct device *dev,
dev_set_drvdata(dev, master);
ret = mpc8xxx_spi_probe(dev, mem, irq);
if (ret)
goto err_probe;
mpc8xxx_spi_probe(dev, mem, irq);
master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16);
master->setup = fsl_espi_setup;
master->cleanup = fsl_espi_cleanup;
master->transfer_one_message = fsl_espi_do_one_msg;
master->prepare_transfer_hardware = fsl_espi_resume;
master->unprepare_transfer_hardware = fsl_espi_suspend;
mpc8xxx_spi = spi_master_get_devdata(master);
mpc8xxx_spi->spi_do_one_msg = fsl_espi_do_one_msg;
mpc8xxx_spi->spi_remove = fsl_espi_remove;
mpc8xxx_spi->reg_base = ioremap(mem->start, resource_size(mem));
@ -762,25 +795,15 @@ static int of_fsl_espi_remove(struct platform_device *dev)
static int of_fsl_espi_suspend(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct mpc8xxx_spi *mpc8xxx_spi;
struct fsl_espi_reg *reg_base;
u32 regval;
int ret;
mpc8xxx_spi = spi_master_get_devdata(master);
reg_base = mpc8xxx_spi->reg_base;
ret = spi_master_suspend(master);
if (ret) {
dev_warn(dev, "cannot suspend master\n");
return ret;
}
regval = mpc8xxx_spi_read_reg(&reg_base->mode);
regval &= ~SPMODE_ENABLE;
mpc8xxx_spi_write_reg(&reg_base->mode, regval);
return 0;
return fsl_espi_suspend(master);
}
static int of_fsl_espi_resume(struct device *dev)

59
drivers/spi/spi-fsl-lib.c
View file

@ -61,44 +61,6 @@ struct mpc8xxx_spi_probe_info *to_of_pinfo(struct fsl_spi_platform_data *pdata)
return container_of(pdata, struct mpc8xxx_spi_probe_info, pdata);
}
static void mpc8xxx_spi_work(struct work_struct *work)
{
struct mpc8xxx_spi *mpc8xxx_spi = container_of(work, struct mpc8xxx_spi,
work);
spin_lock_irq(&mpc8xxx_spi->lock);
while (!list_empty(&mpc8xxx_spi->queue)) {
struct spi_message *m = container_of(mpc8xxx_spi->queue.next,
struct spi_message, queue);
list_del_init(&m->queue);
spin_unlock_irq(&mpc8xxx_spi->lock);
if (mpc8xxx_spi->spi_do_one_msg)
mpc8xxx_spi->spi_do_one_msg(m);
spin_lock_irq(&mpc8xxx_spi->lock);
}
spin_unlock_irq(&mpc8xxx_spi->lock);
}
int mpc8xxx_spi_transfer(struct spi_device *spi,
struct spi_message *m)
{
struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
unsigned long flags;
m->actual_length = 0;
m->status = -EINPROGRESS;
spin_lock_irqsave(&mpc8xxx_spi->lock, flags);
list_add_tail(&m->queue, &mpc8xxx_spi->queue);
queue_work(mpc8xxx_spi->workqueue, &mpc8xxx_spi->work);
spin_unlock_irqrestore(&mpc8xxx_spi->lock, flags);
return 0;
}
const char *mpc8xxx_spi_strmode(unsigned int flags)
{
if (flags & SPI_QE_CPU_MODE) {
@ -114,13 +76,12 @@ const char *mpc8xxx_spi_strmode(unsigned int flags)
return "CPU";
}
int mpc8xxx_spi_probe(struct device *dev, struct resource *mem,
void mpc8xxx_spi_probe(struct device *dev, struct resource *mem,
unsigned int irq)
{
struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
struct spi_master *master;
struct mpc8xxx_spi *mpc8xxx_spi;
int ret = 0;
master = dev_get_drvdata(dev);
@ -128,7 +89,6 @@ int mpc8xxx_spi_probe(struct device *dev, struct resource *mem,
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH
| SPI_LSB_FIRST | SPI_LOOP;
master->transfer = mpc8xxx_spi_transfer;
master->dev.of_node = dev->of_node;
mpc8xxx_spi = spi_master_get_devdata(master);
@ -147,22 +107,7 @@ int mpc8xxx_spi_probe(struct device *dev, struct resource *mem,
master->bus_num = pdata->bus_num;
master->num_chipselect = pdata->max_chipselect;
spin_lock_init(&mpc8xxx_spi->lock);
init_completion(&mpc8xxx_spi->done);
INIT_WORK(&mpc8xxx_spi->work, mpc8xxx_spi_work);
INIT_LIST_HEAD(&mpc8xxx_spi->queue);
mpc8xxx_spi->workqueue = create_singlethread_workqueue(
dev_name(master->dev.parent));
if (mpc8xxx_spi->workqueue == NULL) {
ret = -EBUSY;
goto err;
}
return 0;
err:
return ret;
}
int mpc8xxx_spi_remove(struct device *dev)
@ -173,8 +118,6 @@ int mpc8xxx_spi_remove(struct device *dev)
master = dev_get_drvdata(dev);
mpc8xxx_spi = spi_master_get_devdata(master);
flush_workqueue(mpc8xxx_spi->workqueue);
destroy_workqueue(mpc8xxx_spi->workqueue);
spi_unregister_master(master);
free_irq(mpc8xxx_spi->irq, mpc8xxx_spi);

10
drivers/spi/spi-fsl-lib.h
View file

@ -55,7 +55,6 @@ struct mpc8xxx_spi {
u32(*get_tx) (struct mpc8xxx_spi *);
/* hooks for different controller driver */
void (*spi_do_one_msg) (struct spi_message *m);
void (*spi_remove) (struct mpc8xxx_spi *mspi);
unsigned int count;
@ -78,12 +77,6 @@ struct mpc8xxx_spi {
int bits_per_word, int msb_first);
#endif
struct workqueue_struct *workqueue;
struct work_struct work;
struct list_head queue;
spinlock_t lock;
struct completion done;
};
@ -123,9 +116,8 @@ extern struct mpc8xxx_spi_probe_info *to_of_pinfo(
struct fsl_spi_platform_data *pdata);
extern int mpc8xxx_spi_bufs(struct mpc8xxx_spi *mspi,
struct spi_transfer *t, unsigned int len);
extern int mpc8xxx_spi_transfer(struct spi_device *spi, struct spi_message *m);
extern const char *mpc8xxx_spi_strmode(unsigned int flags);
extern int mpc8xxx_spi_probe(struct device *dev, struct resource *mem,
extern void mpc8xxx_spi_probe(struct device *dev, struct resource *mem,
unsigned int irq);
extern int mpc8xxx_spi_remove(struct device *dev);
extern int of_mpc8xxx_spi_probe(struct platform_device *ofdev);

17
drivers/spi/spi-fsl-spi.c
View file

@ -353,7 +353,8 @@ static int fsl_spi_bufs(struct spi_device *spi, struct spi_transfer *t,
return mpc8xxx_spi->count;
}
static void fsl_spi_do_one_msg(struct spi_message *m)
static int fsl_spi_do_one_msg(struct spi_master *master,
struct spi_message *m)
{
struct spi_device *spi = m->spi;
struct spi_transfer *t, *first;
@ -367,10 +368,9 @@ static void fsl_spi_do_one_msg(struct spi_message *m)
list_for_each_entry(t, &m->transfers, transfer_list) {
if ((first->bits_per_word != t->bits_per_word) ||
(first->speed_hz != t->speed_hz)) {
status = -EINVAL;
dev_err(&spi->dev,
"bits_per_word/speed_hz should be same for the same SPI transfer\n");
return;
return -EINVAL;
}
}
@ -408,8 +408,7 @@ static void fsl_spi_do_one_msg(struct spi_message *m)
}
m->status = status;
if (m->complete)
m->complete(m->context);
spi_finalize_current_message(master);
if (status || !cs_change) {
ndelay(nsecs);
@ -417,6 +416,7 @@ static void fsl_spi_do_one_msg(struct spi_message *m)
}
fsl_spi_setup_transfer(spi, NULL);
return 0;
}
static int fsl_spi_setup(struct spi_device *spi)
@ -624,15 +624,13 @@ static struct spi_master * fsl_spi_probe(struct device *dev,
dev_set_drvdata(dev, master);
ret = mpc8xxx_spi_probe(dev, mem, irq);
if (ret)
goto err_probe;
mpc8xxx_spi_probe(dev, mem, irq);
master->setup = fsl_spi_setup;
master->cleanup = fsl_spi_cleanup;
master->transfer_one_message = fsl_spi_do_one_msg;
mpc8xxx_spi = spi_master_get_devdata(master);
mpc8xxx_spi->spi_do_one_msg = fsl_spi_do_one_msg;
mpc8xxx_spi->spi_remove = fsl_spi_remove;
mpc8xxx_spi->max_bits_per_word = 32;
mpc8xxx_spi->type = fsl_spi_get_type(dev);
@ -704,7 +702,6 @@ free_irq:
err_ioremap:
fsl_spi_cpm_free(mpc8xxx_spi);
err_cpm_init:
err_probe:
spi_master_put(master);
err:
return ERR_PTR(ret);

37
drivers/spi/spi-gpio.c
View file

@ -48,7 +48,7 @@ struct spi_gpio {
struct spi_bitbang bitbang;
struct spi_gpio_platform_data pdata;
struct platform_device *pdev;
int cs_gpios[0];
unsigned long cs_gpios[0];
};
/*----------------------------------------------------------------------*/
@ -220,7 +220,7 @@ static u32 spi_gpio_spec_txrx_word_mode3(struct spi_device *spi,
static void spi_gpio_chipselect(struct spi_device *spi, int is_active)
{
struct spi_gpio *spi_gpio = spi_to_spi_gpio(spi);
unsigned int cs = spi_gpio->cs_gpios[spi->chip_select];
unsigned long cs = spi_gpio->cs_gpios[spi->chip_select];
/* set initial clock polarity */
if (is_active)
@ -234,7 +234,7 @@ static void spi_gpio_chipselect(struct spi_device *spi, int is_active)
static int spi_gpio_setup(struct spi_device *spi)
{
unsigned int cs;
unsigned long cs;
int status = 0;
struct spi_gpio *spi_gpio = spi_to_spi_gpio(spi);
struct device_node *np = spi->master->dev.of_node;
@ -249,7 +249,7 @@ static int spi_gpio_setup(struct spi_device *spi)
/*
* ... otherwise, take it from spi->controller_data
*/
cs = (unsigned int)(uintptr_t) spi->controller_data;
cs = (uintptr_t) spi->controller_data;
}
if (!spi->controller_state) {
@ -277,7 +277,7 @@ static int spi_gpio_setup(struct spi_device *spi)
static void spi_gpio_cleanup(struct spi_device *spi)
{
struct spi_gpio *spi_gpio = spi_to_spi_gpio(spi);
unsigned int cs = spi_gpio->cs_gpios[spi->chip_select];
unsigned long cs = spi_gpio->cs_gpios[spi->chip_select];
if (cs != SPI_GPIO_NO_CHIPSELECT)
gpio_free(cs);
@ -413,6 +413,7 @@ static int spi_gpio_probe(struct platform_device *pdev)
struct spi_gpio_platform_data *pdata;
u16 master_flags = 0;
bool use_of = 0;
int num_devices;
status = spi_gpio_probe_dt(pdev);
if (status < 0)
@ -422,16 +423,21 @@ static int spi_gpio_probe(struct platform_device *pdev)
pdata = dev_get_platdata(&pdev->dev);
#ifdef GENERIC_BITBANG
if (!pdata || !pdata->num_chipselect)
if (!pdata || (!use_of && !pdata->num_chipselect))
return -ENODEV;
#endif
if (use_of && !SPI_N_CHIPSEL)
num_devices = 1;
else
num_devices = SPI_N_CHIPSEL;
status = spi_gpio_request(pdata, dev_name(&pdev->dev), &master_flags);
if (status < 0)
return status;
master = spi_alloc_master(&pdev->dev, sizeof(*spi_gpio) +
(sizeof(int) * SPI_N_CHIPSEL));
(sizeof(unsigned long) * num_devices));
if (!master) {
status = -ENOMEM;
goto gpio_free;
@ -446,7 +452,7 @@ static int spi_gpio_probe(struct platform_device *pdev)
master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
master->flags = master_flags;
master->bus_num = pdev->id;
master->num_chipselect = SPI_N_CHIPSEL;
master->num_chipselect = num_devices;
master->setup = spi_gpio_setup;
master->cleanup = spi_gpio_cleanup;
#ifdef CONFIG_OF
@ -461,9 +467,18 @@ static int spi_gpio_probe(struct platform_device *pdev)
* property of the node.
*/
for (i = 0; i < SPI_N_CHIPSEL; i++)
spi_gpio->cs_gpios[i] =
of_get_named_gpio(np, "cs-gpios", i);
if (!SPI_N_CHIPSEL)
spi_gpio->cs_gpios[0] = SPI_GPIO_NO_CHIPSELECT;
else
for (i = 0; i < SPI_N_CHIPSEL; i++) {
status = of_get_named_gpio(np, "cs-gpios", i);
if (status < 0) {
dev_err(&pdev->dev,
"invalid cs-gpios property\n");
goto gpio_free;
}
spi_gpio->cs_gpios[i] = status;
}
}
#endif

746
drivers/spi/spi-img-spfi.c Normal file
View file

@ -0,0 +1,746 @@
/*
* IMG SPFI controller driver
*
* Copyright (C) 2007,2008,2013 Imagination Technologies Ltd.
* Copyright (C) 2014 Google, Inc.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dmaengine.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <linux/spinlock.h>
#define SPFI_DEVICE_PARAMETER(x) (0x00 + 0x4 * (x))
#define SPFI_DEVICE_PARAMETER_BITCLK_SHIFT 24
#define SPFI_DEVICE_PARAMETER_BITCLK_MASK 0xff
#define SPFI_DEVICE_PARAMETER_CSSETUP_SHIFT 16
#define SPFI_DEVICE_PARAMETER_CSSETUP_MASK 0xff
#define SPFI_DEVICE_PARAMETER_CSHOLD_SHIFT 8
#define SPFI_DEVICE_PARAMETER_CSHOLD_MASK 0xff
#define SPFI_DEVICE_PARAMETER_CSDELAY_SHIFT 0
#define SPFI_DEVICE_PARAMETER_CSDELAY_MASK 0xff
#define SPFI_CONTROL 0x14
#define SPFI_CONTROL_CONTINUE BIT(12)
#define SPFI_CONTROL_SOFT_RESET BIT(11)
#define SPFI_CONTROL_SEND_DMA BIT(10)
#define SPFI_CONTROL_GET_DMA BIT(9)
#define SPFI_CONTROL_TMODE_SHIFT 5
#define SPFI_CONTROL_TMODE_MASK 0x7
#define SPFI_CONTROL_TMODE_SINGLE 0
#define SPFI_CONTROL_TMODE_DUAL 1
#define SPFI_CONTROL_TMODE_QUAD 2
#define SPFI_CONTROL_SPFI_EN BIT(0)
#define SPFI_TRANSACTION 0x18
#define SPFI_TRANSACTION_TSIZE_SHIFT 16
#define SPFI_TRANSACTION_TSIZE_MASK 0xffff
#define SPFI_PORT_STATE 0x1c
#define SPFI_PORT_STATE_DEV_SEL_SHIFT 20
#define SPFI_PORT_STATE_DEV_SEL_MASK 0x7
#define SPFI_PORT_STATE_CK_POL(x) BIT(19 - (x))
#define SPFI_PORT_STATE_CK_PHASE(x) BIT(14 - (x))
#define SPFI_TX_32BIT_VALID_DATA 0x20
#define SPFI_TX_8BIT_VALID_DATA 0x24
#define SPFI_RX_32BIT_VALID_DATA 0x28
#define SPFI_RX_8BIT_VALID_DATA 0x2c
#define SPFI_INTERRUPT_STATUS 0x30
#define SPFI_INTERRUPT_ENABLE 0x34
#define SPFI_INTERRUPT_CLEAR 0x38
#define SPFI_INTERRUPT_IACCESS BIT(12)
#define SPFI_INTERRUPT_GDEX8BIT BIT(11)
#define SPFI_INTERRUPT_ALLDONETRIG BIT(9)
#define SPFI_INTERRUPT_GDFUL BIT(8)
#define SPFI_INTERRUPT_GDHF BIT(7)
#define SPFI_INTERRUPT_GDEX32BIT BIT(6)
#define SPFI_INTERRUPT_GDTRIG BIT(5)
#define SPFI_INTERRUPT_SDFUL BIT(3)
#define SPFI_INTERRUPT_SDHF BIT(2)
#define SPFI_INTERRUPT_SDE BIT(1)
#define SPFI_INTERRUPT_SDTRIG BIT(0)
/*
* There are four parallel FIFOs of 16 bytes each. The word buffer
* (*_32BIT_VALID_DATA) accesses all four FIFOs at once, resulting in an
* effective FIFO size of 64 bytes. The byte buffer (*_8BIT_VALID_DATA)
* accesses only a single FIFO, resulting in an effective FIFO size of
* 16 bytes.
*/
#define SPFI_32BIT_FIFO_SIZE 64
#define SPFI_8BIT_FIFO_SIZE 16
struct img_spfi {
struct device *dev;
struct spi_master *master;
spinlock_t lock;
void __iomem *regs;
phys_addr_t phys;
int irq;
struct clk *spfi_clk;
struct clk *sys_clk;
struct dma_chan *rx_ch;
struct dma_chan *tx_ch;
bool tx_dma_busy;
bool rx_dma_busy;
};
static inline u32 spfi_readl(struct img_spfi *spfi, u32 reg)
{
return readl(spfi->regs + reg);
}
static inline void spfi_writel(struct img_spfi *spfi, u32 val, u32 reg)
{
writel(val, spfi->regs + reg);
}
static inline void spfi_start(struct img_spfi *spfi)
{
u32 val;
val = spfi_readl(spfi, SPFI_CONTROL);
val |= SPFI_CONTROL_SPFI_EN;
spfi_writel(spfi, val, SPFI_CONTROL);
}
static inline void spfi_stop(struct img_spfi *spfi)
{
u32 val;
val = spfi_readl(spfi, SPFI_CONTROL);
val &= ~SPFI_CONTROL_SPFI_EN;
spfi_writel(spfi, val, SPFI_CONTROL);
}
static inline void spfi_reset(struct img_spfi *spfi)
{
spfi_writel(spfi, SPFI_CONTROL_SOFT_RESET, SPFI_CONTROL);
udelay(1);
spfi_writel(spfi, 0, SPFI_CONTROL);
}
static void spfi_flush_tx_fifo(struct img_spfi *spfi)
{
unsigned long timeout = jiffies + msecs_to_jiffies(10);
spfi_writel(spfi, SPFI_INTERRUPT_SDE, SPFI_INTERRUPT_CLEAR);
while (time_before(jiffies, timeout)) {
if (spfi_readl(spfi, SPFI_INTERRUPT_STATUS) &
SPFI_INTERRUPT_SDE)
return;
cpu_relax();
}
dev_err(spfi->dev, "Timed out waiting for FIFO to drain\n");
spfi_reset(spfi);
}
static unsigned int spfi_pio_write32(struct img_spfi *spfi, const u32 *buf,
unsigned int max)
{
unsigned int count = 0;
u32 status;
while (count < max) {
spfi_writel(spfi, SPFI_INTERRUPT_SDFUL, SPFI_INTERRUPT_CLEAR);
status = spfi_readl(spfi, SPFI_INTERRUPT_STATUS);
if (status & SPFI_INTERRUPT_SDFUL)
break;
spfi_writel(spfi, buf[count / 4], SPFI_TX_32BIT_VALID_DATA);
count += 4;
}
return count;
}
static unsigned int spfi_pio_write8(struct img_spfi *spfi, const u8 *buf,
unsigned int max)
{
unsigned int count = 0;
u32 status;
while (count < max) {
spfi_writel(spfi, SPFI_INTERRUPT_SDFUL, SPFI_INTERRUPT_CLEAR);
status = spfi_readl(spfi, SPFI_INTERRUPT_STATUS);
if (status & SPFI_INTERRUPT_SDFUL)
break;
spfi_writel(spfi, buf[count], SPFI_TX_8BIT_VALID_DATA);
count++;
}
return count;
}
static unsigned int spfi_pio_read32(struct img_spfi *spfi, u32 *buf,
unsigned int max)
{
unsigned int count = 0;
u32 status;
while (count < max) {
spfi_writel(spfi, SPFI_INTERRUPT_GDEX32BIT,
SPFI_INTERRUPT_CLEAR);
status = spfi_readl(spfi, SPFI_INTERRUPT_STATUS);
if (!(status & SPFI_INTERRUPT_GDEX32BIT))
break;
buf[count / 4] = spfi_readl(spfi, SPFI_RX_32BIT_VALID_DATA);
count += 4;
}
return count;
}
static unsigned int spfi_pio_read8(struct img_spfi *spfi, u8 *buf,
unsigned int max)
{
unsigned int count = 0;
u32 status;
while (count < max) {
spfi_writel(spfi, SPFI_INTERRUPT_GDEX8BIT,
SPFI_INTERRUPT_CLEAR);
status = spfi_readl(spfi, SPFI_INTERRUPT_STATUS);
if (!(status & SPFI_INTERRUPT_GDEX8BIT))
break;
buf[count] = spfi_readl(spfi, SPFI_RX_8BIT_VALID_DATA);
count++;
}
return count;
}
static int img_spfi_start_pio(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *xfer)
{
struct img_spfi *spfi = spi_master_get_devdata(spi->master);
unsigned int tx_bytes = 0, rx_bytes = 0;
const void *tx_buf = xfer->tx_buf;
void *rx_buf = xfer->rx_buf;
unsigned long timeout;
if (tx_buf)
tx_bytes = xfer->len;
if (rx_buf)
rx_bytes = xfer->len;
spfi_start(spfi);
timeout = jiffies +
msecs_to_jiffies(xfer->len * 8 * 1000 / xfer->speed_hz + 100);
while ((tx_bytes > 0 || rx_bytes > 0) &&
time_before(jiffies, timeout)) {
unsigned int tx_count, rx_count;
switch (xfer->bits_per_word) {
case 32:
tx_count = spfi_pio_write32(spfi, tx_buf, tx_bytes);
rx_count = spfi_pio_read32(spfi, rx_buf, rx_bytes);
break;
case 8:
default:
tx_count = spfi_pio_write8(spfi, tx_buf, tx_bytes);
rx_count = spfi_pio_read8(spfi, rx_buf, rx_bytes);
break;
}
tx_buf += tx_count;
rx_buf += rx_count;
tx_bytes -= tx_count;
rx_bytes -= rx_count;
cpu_relax();
}
if (rx_bytes > 0 || tx_bytes > 0) {
dev_err(spfi->dev, "PIO transfer timed out\n");
spfi_reset(spfi);
return -ETIMEDOUT;
}
if (tx_buf)
spfi_flush_tx_fifo(spfi);
spfi_stop(spfi);
return 0;
}
static void img_spfi_dma_rx_cb(void *data)
{
struct img_spfi *spfi = data;
unsigned long flags;
spin_lock_irqsave(&spfi->lock, flags);
spfi->rx_dma_busy = false;
if (!spfi->tx_dma_busy) {
spfi_stop(spfi);
spi_finalize_current_transfer(spfi->master);
}
spin_unlock_irqrestore(&spfi->lock, flags);
}
static void img_spfi_dma_tx_cb(void *data)
{
struct img_spfi *spfi = data;
unsigned long flags;
spfi_flush_tx_fifo(spfi);
spin_lock_irqsave(&spfi->lock, flags);
spfi->tx_dma_busy = false;
if (!spfi->rx_dma_busy) {
spfi_stop(spfi);
spi_finalize_current_transfer(spfi->master);
}
spin_unlock_irqrestore(&spfi->lock, flags);
}
static int img_spfi_start_dma(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *xfer)
{
struct img_spfi *spfi = spi_master_get_devdata(spi->master);
struct dma_async_tx_descriptor *rxdesc = NULL, *txdesc = NULL;
struct dma_slave_config rxconf, txconf;
spfi->rx_dma_busy = false;
spfi->tx_dma_busy = false;
if (xfer->rx_buf) {
rxconf.direction = DMA_DEV_TO_MEM;
switch (xfer->bits_per_word) {
case 32:
rxconf.src_addr = spfi->phys + SPFI_RX_32BIT_VALID_DATA;
rxconf.src_addr_width = 4;
rxconf.src_maxburst = 4;
break;
case 8:
default:
rxconf.src_addr = spfi->phys + SPFI_RX_8BIT_VALID_DATA;
rxconf.src_addr_width = 1;
rxconf.src_maxburst = 1;
}
dmaengine_slave_config(spfi->rx_ch, &rxconf);
rxdesc = dmaengine_prep_slave_sg(spfi->rx_ch, xfer->rx_sg.sgl,
xfer->rx_sg.nents,
DMA_DEV_TO_MEM,
DMA_PREP_INTERRUPT);
if (!rxdesc)
goto stop_dma;
rxdesc->callback = img_spfi_dma_rx_cb;
rxdesc->callback_param = spfi;
}
if (xfer->tx_buf) {
txconf.direction = DMA_MEM_TO_DEV;
switch (xfer->bits_per_word) {
case 32:
txconf.dst_addr = spfi->phys + SPFI_TX_32BIT_VALID_DATA;
txconf.dst_addr_width = 4;
txconf.dst_maxburst = 4;
break;
case 8:
default:
txconf.dst_addr = spfi->phys + SPFI_TX_8BIT_VALID_DATA;
txconf.dst_addr_width = 1;
txconf.dst_maxburst = 1;
break;
}
dmaengine_slave_config(spfi->tx_ch, &txconf);
txdesc = dmaengine_prep_slave_sg(spfi->tx_ch, xfer->tx_sg.sgl,
xfer->tx_sg.nents,
DMA_MEM_TO_DEV,
DMA_PREP_INTERRUPT);
if (!txdesc)
goto stop_dma;
txdesc->callback = img_spfi_dma_tx_cb;
txdesc->callback_param = spfi;
}
if (xfer->rx_buf) {
spfi->rx_dma_busy = true;
dmaengine_submit(rxdesc);
dma_async_issue_pending(spfi->rx_ch);
}
if (xfer->tx_buf) {
spfi->tx_dma_busy = true;
dmaengine_submit(txdesc);
dma_async_issue_pending(spfi->tx_ch);
}
spfi_start(spfi);
return 1;
stop_dma:
dmaengine_terminate_all(spfi->rx_ch);
dmaengine_terminate_all(spfi->tx_ch);
return -EIO;
}
static void img_spfi_config(struct spi_master *master, struct spi_device *spi,
struct spi_transfer *xfer)
{
struct img_spfi *spfi = spi_master_get_devdata(spi->master);
u32 val, div;
/*
* output = spfi_clk * (BITCLK / 512), where BITCLK must be a
* power of 2 up to 256 (where 255 == 256 since BITCLK is 8 bits)
*/
div = DIV_ROUND_UP(master->max_speed_hz, xfer->speed_hz);
div = clamp(512 / (1 << get_count_order(div)), 1, 255);
val = spfi_readl(spfi, SPFI_DEVICE_PARAMETER(spi->chip_select));
val &= ~(SPFI_DEVICE_PARAMETER_BITCLK_MASK <<
SPFI_DEVICE_PARAMETER_BITCLK_SHIFT);
val |= div << SPFI_DEVICE_PARAMETER_BITCLK_SHIFT;
spfi_writel(spfi, val, SPFI_DEVICE_PARAMETER(spi->chip_select));
val = spfi_readl(spfi, SPFI_CONTROL);
val &= ~(SPFI_CONTROL_SEND_DMA | SPFI_CONTROL_GET_DMA);
if (xfer->tx_buf)
val |= SPFI_CONTROL_SEND_DMA;
if (xfer->rx_buf)
val |= SPFI_CONTROL_GET_DMA;
val &= ~(SPFI_CONTROL_TMODE_MASK << SPFI_CONTROL_TMODE_SHIFT);
if (xfer->tx_nbits == SPI_NBITS_DUAL &&
xfer->rx_nbits == SPI_NBITS_DUAL)
val |= SPFI_CONTROL_TMODE_DUAL << SPFI_CONTROL_TMODE_SHIFT;
else if (xfer->tx_nbits == SPI_NBITS_QUAD &&
xfer->rx_nbits == SPI_NBITS_QUAD)
val |= SPFI_CONTROL_TMODE_QUAD << SPFI_CONTROL_TMODE_SHIFT;
val &= ~SPFI_CONTROL_CONTINUE;
if (!xfer->cs_change && !list_is_last(&xfer->transfer_list,
&master->cur_msg->transfers))
val |= SPFI_CONTROL_CONTINUE;
spfi_writel(spfi, val, SPFI_CONTROL);
val = spfi_readl(spfi, SPFI_PORT_STATE);
if (spi->mode & SPI_CPHA)
val |= SPFI_PORT_STATE_CK_PHASE(spi->chip_select);
else
val &= ~SPFI_PORT_STATE_CK_PHASE(spi->chip_select);
if (spi->mode & SPI_CPOL)
val |= SPFI_PORT_STATE_CK_POL(spi->chip_select);
else
val &= ~SPFI_PORT_STATE_CK_POL(spi->chip_select);
spfi_writel(spfi, val, SPFI_PORT_STATE);
spfi_writel(spfi, xfer->len << SPFI_TRANSACTION_TSIZE_SHIFT,
SPFI_TRANSACTION);
}
static int img_spfi_transfer_one(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *xfer)
{
struct img_spfi *spfi = spi_master_get_devdata(spi->master);
bool dma_reset = false;
unsigned long flags;
int ret;
/*
* Stop all DMA and reset the controller if the previous transaction
* timed-out and never completed it's DMA.
*/
spin_lock_irqsave(&spfi->lock, flags);
if (spfi->tx_dma_busy || spfi->rx_dma_busy) {
dev_err(spfi->dev, "SPI DMA still busy\n");
dma_reset = true;
}
spin_unlock_irqrestore(&spfi->lock, flags);
if (dma_reset) {
dmaengine_terminate_all(spfi->tx_ch);
dmaengine_terminate_all(spfi->rx_ch);
spfi_reset(spfi);
}
img_spfi_config(master, spi, xfer);
if (master->can_dma && master->can_dma(master, spi, xfer))
ret = img_spfi_start_dma(master, spi, xfer);
else
ret = img_spfi_start_pio(master, spi, xfer);
return ret;
}
static void img_spfi_set_cs(struct spi_device *spi, bool enable)
{
struct img_spfi *spfi = spi_master_get_devdata(spi->master);
u32 val;
val = spfi_readl(spfi, SPFI_PORT_STATE);
val &= ~(SPFI_PORT_STATE_DEV_SEL_MASK << SPFI_PORT_STATE_DEV_SEL_SHIFT);
val |= spi->chip_select << SPFI_PORT_STATE_DEV_SEL_SHIFT;
spfi_writel(spfi, val, SPFI_PORT_STATE);
}
static bool img_spfi_can_dma(struct spi_master *master, struct spi_device *spi,
struct spi_transfer *xfer)
{
if (xfer->bits_per_word == 8 && xfer->len > SPFI_8BIT_FIFO_SIZE)
return true;
if (xfer->bits_per_word == 32 && xfer->len > SPFI_32BIT_FIFO_SIZE)
return true;
return false;
}
static irqreturn_t img_spfi_irq(int irq, void *dev_id)
{
struct img_spfi *spfi = (struct img_spfi *)dev_id;
u32 status;
status = spfi_readl(spfi, SPFI_INTERRUPT_STATUS);
if (status & SPFI_INTERRUPT_IACCESS) {
spfi_writel(spfi, SPFI_INTERRUPT_IACCESS, SPFI_INTERRUPT_CLEAR);
dev_err(spfi->dev, "Illegal access interrupt");
return IRQ_HANDLED;
}
return IRQ_NONE;
}
static int img_spfi_probe(struct platform_device *pdev)
{
struct spi_master *master;
struct img_spfi *spfi;
struct resource *res;
int ret;
master = spi_alloc_master(&pdev->dev, sizeof(*spfi));
if (!master)
return -ENOMEM;
platform_set_drvdata(pdev, master);
spfi = spi_master_get_devdata(master);
spfi->dev = &pdev->dev;
spfi->master = master;
spin_lock_init(&spfi->lock);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
spfi->regs = devm_ioremap_resource(spfi->dev, res);
if (IS_ERR(spfi->regs)) {
ret = PTR_ERR(spfi->regs);
goto put_spi;
}
spfi->phys = res->start;
spfi->irq = platform_get_irq(pdev, 0);
if (spfi->irq < 0) {
ret = spfi->irq;
goto put_spi;
}
ret = devm_request_irq(spfi->dev, spfi->irq, img_spfi_irq,
IRQ_TYPE_LEVEL_HIGH, dev_name(spfi->dev), spfi);
if (ret)
goto put_spi;
spfi->sys_clk = devm_clk_get(spfi->dev, "sys");
if (IS_ERR(spfi->sys_clk)) {
ret = PTR_ERR(spfi->sys_clk);
goto put_spi;
}
spfi->spfi_clk = devm_clk_get(spfi->dev, "spfi");
if (IS_ERR(spfi->spfi_clk)) {
ret = PTR_ERR(spfi->spfi_clk);
goto put_spi;
}
ret = clk_prepare_enable(spfi->sys_clk);
if (ret)
goto put_spi;
ret = clk_prepare_enable(spfi->spfi_clk);
if (ret)
goto disable_pclk;
spfi_reset(spfi);
/*
* Only enable the error (IACCESS) interrupt. In PIO mode we'll
* poll the status of the FIFOs.
*/
spfi_writel(spfi, SPFI_INTERRUPT_IACCESS, SPFI_INTERRUPT_ENABLE);
master->auto_runtime_pm = true;
master->bus_num = pdev->id;
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_TX_DUAL | SPI_RX_DUAL;
if (of_property_read_bool(spfi->dev->of_node, "img,supports-quad-mode"))
master->mode_bits |= SPI_TX_QUAD | SPI_RX_QUAD;
master->num_chipselect = 5;
master->dev.of_node = pdev->dev.of_node;
master->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(8);
master->max_speed_hz = clk_get_rate(spfi->spfi_clk);
master->min_speed_hz = master->max_speed_hz / 512;
master->set_cs = img_spfi_set_cs;
master->transfer_one = img_spfi_transfer_one;
spfi->tx_ch = dma_request_slave_channel(spfi->dev, "tx");
spfi->rx_ch = dma_request_slave_channel(spfi->dev, "rx");
if (!spfi->tx_ch || !spfi->rx_ch) {
if (spfi->tx_ch)
dma_release_channel(spfi->tx_ch);
if (spfi->rx_ch)
dma_release_channel(spfi->rx_ch);
dev_warn(spfi->dev, "Failed to get DMA channels, falling back to PIO mode\n");
} else {
master->dma_tx = spfi->tx_ch;
master->dma_rx = spfi->rx_ch;
master->can_dma = img_spfi_can_dma;
}
pm_runtime_set_active(spfi->dev);
pm_runtime_enable(spfi->dev);
ret = devm_spi_register_master(spfi->dev, master);
if (ret)
goto disable_pm;
return 0;
disable_pm:
pm_runtime_disable(spfi->dev);
if (spfi->rx_ch)
dma_release_channel(spfi->rx_ch);
if (spfi->tx_ch)
dma_release_channel(spfi->tx_ch);
clk_disable_unprepare(spfi->spfi_clk);
disable_pclk:
clk_disable_unprepare(spfi->sys_clk);
put_spi:
spi_master_put(master);
return ret;
}
static int img_spfi_remove(struct platform_device *pdev)
{
struct spi_master *master = platform_get_drvdata(pdev);
struct img_spfi *spfi = spi_master_get_devdata(master);
if (spfi->tx_ch)
dma_release_channel(spfi->tx_ch);
if (spfi->rx_ch)
dma_release_channel(spfi->rx_ch);
pm_runtime_disable(spfi->dev);
if (!pm_runtime_status_suspended(spfi->dev)) {
clk_disable_unprepare(spfi->spfi_clk);
clk_disable_unprepare(spfi->sys_clk);
}
spi_master_put(master);
return 0;
}
#ifdef CONFIG_PM_RUNTIME
static int img_spfi_runtime_suspend(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct img_spfi *spfi = spi_master_get_devdata(master);
clk_disable_unprepare(spfi->spfi_clk);
clk_disable_unprepare(spfi->sys_clk);
return 0;
}
static int img_spfi_runtime_resume(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct img_spfi *spfi = spi_master_get_devdata(master);
int ret;
ret = clk_prepare_enable(spfi->sys_clk);
if (ret)
return ret;
ret = clk_prepare_enable(spfi->spfi_clk);
if (ret) {
clk_disable_unprepare(spfi->sys_clk);
return ret;
}
return 0;
}
#endif /* CONFIG_PM_RUNTIME */
#ifdef CONFIG_PM_SLEEP
static int img_spfi_suspend(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
return spi_master_suspend(master);
}
static int img_spfi_resume(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct img_spfi *spfi = spi_master_get_devdata(master);
int ret;
ret = pm_runtime_get_sync(dev);
if (ret)
return ret;
spfi_reset(spfi);
pm_runtime_put(dev);
return spi_master_resume(master);
}
#endif /* CONFIG_PM_SLEEP */
static const struct dev_pm_ops img_spfi_pm_ops = {
SET_RUNTIME_PM_OPS(img_spfi_runtime_suspend, img_spfi_runtime_resume,
NULL)
SET_SYSTEM_SLEEP_PM_OPS(img_spfi_suspend, img_spfi_resume)
};
static const struct of_device_id img_spfi_of_match[] = {
{ .compatible = "img,spfi", },
{ },
};
MODULE_DEVICE_TABLE(of, img_spfi_of_match);
static struct platform_driver img_spfi_driver = {
.driver = {
.name = "img-spfi",
.pm = &img_spfi_pm_ops,
.of_match_table = of_match_ptr(img_spfi_of_match),
},
.probe = img_spfi_probe,
.remove = img_spfi_remove,
};
module_platform_driver(img_spfi_driver);
MODULE_DESCRIPTION("IMG SPFI controller driver");
MODULE_AUTHOR("Andrew Bresticker <abrestic@chromium.org>");
MODULE_LICENSE("GPL v2");

462
drivers/spi/spi-meson-spifc.c Normal file
View file

@ -0,0 +1,462 @@
/*
* Driver for Amlogic Meson SPI flash controller (SPIFC)
*
* Copyright (C) 2014 Beniamino Galvani <b.galvani@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 published by the Free Software Foundation.
*
* 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/delay.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/spi/spi.h>
#include <linux/types.h>
/* register map */
#define REG_CMD 0x00
#define REG_ADDR 0x04
#define REG_CTRL 0x08
#define REG_CTRL1 0x0c
#define REG_STATUS 0x10
#define REG_CTRL2 0x14
#define REG_CLOCK 0x18
#define REG_USER 0x1c
#define REG_USER1 0x20
#define REG_USER2 0x24
#define REG_USER3 0x28
#define REG_USER4 0x2c
#define REG_SLAVE 0x30
#define REG_SLAVE1 0x34
#define REG_SLAVE2 0x38
#define REG_SLAVE3 0x3c
#define REG_C0 0x40
#define REG_B8 0x60
#define REG_MAX 0x7c
/* register fields */
#define CMD_USER BIT(18)
#define CTRL_ENABLE_AHB BIT(17)
#define CLOCK_SOURCE BIT(31)
#define CLOCK_DIV_SHIFT 12
#define CLOCK_DIV_MASK (0x3f << CLOCK_DIV_SHIFT)
#define CLOCK_CNT_HIGH_SHIFT 6
#define CLOCK_CNT_HIGH_MASK (0x3f << CLOCK_CNT_HIGH_SHIFT)
#define CLOCK_CNT_LOW_SHIFT 0
#define CLOCK_CNT_LOW_MASK (0x3f << CLOCK_CNT_LOW_SHIFT)
#define USER_DIN_EN_MS BIT(0)
#define USER_CMP_MODE BIT(2)
#define USER_UC_DOUT_SEL BIT(27)
#define USER_UC_DIN_SEL BIT(28)
#define USER_UC_MASK ((BIT(5) - 1) << 27)
#define USER1_BN_UC_DOUT_SHIFT 17
#define USER1_BN_UC_DOUT_MASK (0xff << 16)
#define USER1_BN_UC_DIN_SHIFT 8
#define USER1_BN_UC_DIN_MASK (0xff << 8)
#define USER4_CS_ACT BIT(30)
#define SLAVE_TRST_DONE BIT(4)
#define SLAVE_OP_MODE BIT(30)
#define SLAVE_SW_RST BIT(31)
#define SPIFC_BUFFER_SIZE 64
/**
* struct meson_spifc
* @master: the SPI master
* @regmap: regmap for device registers
* @clk: input clock of the built-in baud rate generator
* @device: the device structure
*/
struct meson_spifc {
struct spi_master *master;
struct regmap *regmap;
struct clk *clk;
struct device *dev;
};
static struct regmap_config spifc_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.max_register = REG_MAX,
};
/**
* meson_spifc_wait_ready() - wait for the current operation to terminate
* @spifc: the Meson SPI device
* Return: 0 on success, a negative value on error
*/
static int meson_spifc_wait_ready(struct meson_spifc *spifc)
{
unsigned long deadline = jiffies + msecs_to_jiffies(5);
u32 data;
do {
regmap_read(spifc->regmap, REG_SLAVE, &data);
if (data & SLAVE_TRST_DONE)
return 0;
cond_resched();
} while (!time_after(jiffies, deadline));
return -ETIMEDOUT;
}
/**
* meson_spifc_drain_buffer() - copy data from device buffer to memory
* @spifc: the Meson SPI device
* @buf: the destination buffer
* @len: number of bytes to copy
*/
static void meson_spifc_drain_buffer(struct meson_spifc *spifc, u8 *buf,
int len)
{
u32 data;
int i = 0;
while (i < len) {
regmap_read(spifc->regmap, REG_C0 + i, &data);
if (len - i >= 4) {
*((u32 *)buf) = data;
buf += 4;
} else {
memcpy(buf, &data, len - i);
break;
}
i += 4;
}
}
/**
* meson_spifc_fill_buffer() - copy data from memory to device buffer
* @spifc: the Meson SPI device
* @buf: the source buffer
* @len: number of bytes to copy
*/
static void meson_spifc_fill_buffer(struct meson_spifc *spifc, const u8 *buf,
int len)
{
u32 data;
int i = 0;
while (i < len) {
if (len - i >= 4)
data = *(u32 *)buf;
else
memcpy(&data, buf, len - i);
regmap_write(spifc->regmap, REG_C0 + i, data);
buf += 4;
i += 4;
}
}
/**
* meson_spifc_setup_speed() - program the clock divider
* @spifc: the Meson SPI device
* @speed: desired speed in Hz
*/
static void meson_spifc_setup_speed(struct meson_spifc *spifc, u32 speed)
{
unsigned long parent, value;
int n;
parent = clk_get_rate(spifc->clk);
n = max_t(int, parent / speed - 1, 1);
dev_dbg(spifc->dev, "parent %lu, speed %u, n %d\n", parent,
speed, n);
value = (n << CLOCK_DIV_SHIFT) & CLOCK_DIV_MASK;
value |= (n << CLOCK_CNT_LOW_SHIFT) & CLOCK_CNT_LOW_MASK;
value |= (((n + 1) / 2 - 1) << CLOCK_CNT_HIGH_SHIFT) &
CLOCK_CNT_HIGH_MASK;
regmap_write(spifc->regmap, REG_CLOCK, value);
}
/**
* meson_spifc_txrx() - transfer a chunk of data
* @spifc: the Meson SPI device
* @xfer: the current SPI transfer
* @offset: offset of the data to transfer
* @len: length of the data to transfer
* @last_xfer: whether this is the last transfer of the message
* @last_chunk: whether this is the last chunk of the transfer
* Return: 0 on success, a negative value on error
*/
static int meson_spifc_txrx(struct meson_spifc *spifc,
struct spi_transfer *xfer,
int offset, int len, bool last_xfer,
bool last_chunk)
{
bool keep_cs = true;
int ret;
if (xfer->tx_buf)
meson_spifc_fill_buffer(spifc, xfer->tx_buf + offset, len);
/* enable DOUT stage */
regmap_update_bits(spifc->regmap, REG_USER, USER_UC_MASK,
USER_UC_DOUT_SEL);
regmap_write(spifc->regmap, REG_USER1,
(8 * len - 1) << USER1_BN_UC_DOUT_SHIFT);
/* enable data input during DOUT */
regmap_update_bits(spifc->regmap, REG_USER, USER_DIN_EN_MS,
USER_DIN_EN_MS);
if (last_chunk) {
if (last_xfer)
keep_cs = xfer->cs_change;
else
keep_cs = !xfer->cs_change;
}
regmap_update_bits(spifc->regmap, REG_USER4, USER4_CS_ACT,
keep_cs ? USER4_CS_ACT : 0);
/* clear transition done bit */
regmap_update_bits(spifc->regmap, REG_SLAVE, SLAVE_TRST_DONE, 0);
/* start transfer */
regmap_update_bits(spifc->regmap, REG_CMD, CMD_USER, CMD_USER);
ret = meson_spifc_wait_ready(spifc);
if (!ret && xfer->rx_buf)
meson_spifc_drain_buffer(spifc, xfer->rx_buf + offset, len);
return ret;
}
/**
* meson_spifc_transfer_one() - perform a single transfer
* @master: the SPI master
* @spi: the SPI device
* @xfer: the current SPI transfer
* Return: 0 on success, a negative value on error
*/
static int meson_spifc_transfer_one(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *xfer)
{
struct meson_spifc *spifc = spi_master_get_devdata(master);
int len, done = 0, ret = 0;
meson_spifc_setup_speed(spifc, xfer->speed_hz);
regmap_update_bits(spifc->regmap, REG_CTRL, CTRL_ENABLE_AHB, 0);
while (done < xfer->len && !ret) {
len = min_t(int, xfer->len - done, SPIFC_BUFFER_SIZE);
ret = meson_spifc_txrx(spifc, xfer, done, len,
spi_transfer_is_last(master, xfer),
done + len >= xfer->len);
done += len;
}
regmap_update_bits(spifc->regmap, REG_CTRL, CTRL_ENABLE_AHB,
CTRL_ENABLE_AHB);
return ret;
}
/**
* meson_spifc_hw_init() - reset and initialize the SPI controller
* @spifc: the Meson SPI device
*/
static void meson_spifc_hw_init(struct meson_spifc *spifc)
{
/* reset device */
regmap_update_bits(spifc->regmap, REG_SLAVE, SLAVE_SW_RST,
SLAVE_SW_RST);
/* disable compatible mode */
regmap_update_bits(spifc->regmap, REG_USER, USER_CMP_MODE, 0);
/* set master mode */
regmap_update_bits(spifc->regmap, REG_SLAVE, SLAVE_OP_MODE, 0);
}
static int meson_spifc_probe(struct platform_device *pdev)
{
struct spi_master *master;
struct meson_spifc *spifc;
struct resource *res;
void __iomem *base;
unsigned int rate;
int ret = 0;
master = spi_alloc_master(&pdev->dev, sizeof(struct meson_spifc));
if (!master)
return -ENOMEM;
platform_set_drvdata(pdev, master);
spifc = spi_master_get_devdata(master);
spifc->dev = &pdev->dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(spifc->dev, res);
if (IS_ERR(base)) {
ret = PTR_ERR(base);
goto out_err;
}
spifc->regmap = devm_regmap_init_mmio(spifc->dev, base,
&spifc_regmap_config);
if (IS_ERR(spifc->regmap)) {
ret = PTR_ERR(spifc->regmap);
goto out_err;
}
spifc->clk = devm_clk_get(spifc->dev, NULL);
if (IS_ERR(spifc->clk)) {
dev_err(spifc->dev, "missing clock\n");
ret = PTR_ERR(spifc->clk);
goto out_err;
}
ret = clk_prepare_enable(spifc->clk);
if (ret) {
dev_err(spifc->dev, "can't prepare clock\n");
goto out_err;
}
rate = clk_get_rate(spifc->clk);
master->num_chipselect = 1;
master->dev.of_node = pdev->dev.of_node;
master->bits_per_word_mask = SPI_BPW_MASK(8);
master->auto_runtime_pm = true;
master->transfer_one = meson_spifc_transfer_one;
master->min_speed_hz = rate >> 6;
master->max_speed_hz = rate >> 1;
meson_spifc_hw_init(spifc);
pm_runtime_set_active(spifc->dev);
pm_runtime_enable(spifc->dev);
ret = devm_spi_register_master(spifc->dev, master);
if (ret) {
dev_err(spifc->dev, "failed to register spi master\n");
goto out_clk;
}
return 0;
out_clk:
clk_disable_unprepare(spifc->clk);
out_err:
spi_master_put(master);
return ret;
}
static int meson_spifc_remove(struct platform_device *pdev)
{
struct spi_master *master = platform_get_drvdata(pdev);
struct meson_spifc *spifc = spi_master_get_devdata(master);
pm_runtime_get_sync(&pdev->dev);
clk_disable_unprepare(spifc->clk);
pm_runtime_disable(&pdev->dev);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int meson_spifc_suspend(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct meson_spifc *spifc = spi_master_get_devdata(master);
int ret;
ret = spi_master_suspend(master);
if (ret)
return ret;
if (!pm_runtime_suspended(dev))
clk_disable_unprepare(spifc->clk);
return 0;
}
static int meson_spifc_resume(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct meson_spifc *spifc = spi_master_get_devdata(master);
int ret;
if (!pm_runtime_suspended(dev)) {
ret = clk_prepare_enable(spifc->clk);
if (ret)
return ret;
}
meson_spifc_hw_init(spifc);
ret = spi_master_resume(master);
if (ret)
clk_disable_unprepare(spifc->clk);
return ret;
}
#endif /* CONFIG_PM_SLEEP */
#ifdef CONFIG_PM_RUNTIME
static int meson_spifc_runtime_suspend(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct meson_spifc *spifc = spi_master_get_devdata(master);
clk_disable_unprepare(spifc->clk);
return 0;
}
static int meson_spifc_runtime_resume(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct meson_spifc *spifc = spi_master_get_devdata(master);
return clk_prepare_enable(spifc->clk);
}
#endif /* CONFIG_PM_RUNTIME */
static const struct dev_pm_ops meson_spifc_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(meson_spifc_suspend, meson_spifc_resume)
SET_RUNTIME_PM_OPS(meson_spifc_runtime_suspend,
meson_spifc_runtime_resume,
NULL)
};
static const struct of_device_id meson_spifc_dt_match[] = {
{ .compatible = "amlogic,meson6-spifc", },
{ },
};
static struct platform_driver meson_spifc_driver = {
.probe = meson_spifc_probe,
.remove = meson_spifc_remove,
.driver = {
.name = "meson-spifc",
.of_match_table = of_match_ptr(meson_spifc_dt_match),
.pm = &meson_spifc_pm_ops,
},
};
module_platform_driver(meson_spifc_driver);
MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
MODULE_DESCRIPTION("Amlogic Meson SPIFC driver");
MODULE_LICENSE("GPL v2");