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-rw-r--r--drivers/spi/Kconfig11
-rw-r--r--drivers/spi/Makefile1
-rw-r--r--drivers/spi/at25.c389
-rw-r--r--drivers/spi/atmel_spi.c3
-rw-r--r--drivers/spi/xilinx_spi.c137
5 files changed, 82 insertions, 459 deletions
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 4a6fe01831a8..83a185d52961 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -230,17 +230,6 @@ config SPI_XILINX
#
comment "SPI Protocol Masters"
-config SPI_AT25
- tristate "SPI EEPROMs from most vendors"
- depends on SYSFS
- help
- Enable this driver to get read/write support to most SPI EEPROMs,
- after you configure the board init code to know about each eeprom
- on your target board.
-
- This driver can also be built as a module. If so, the module
- will be called at25.
-
config SPI_SPIDEV
tristate "User mode SPI device driver support"
depends on EXPERIMENTAL
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 5e9f521b8844..5d0451936d86 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -33,7 +33,6 @@ obj-$(CONFIG_SPI_SH_SCI) += spi_sh_sci.o
# ... add above this line ...
# SPI protocol drivers (device/link on bus)
-obj-$(CONFIG_SPI_AT25) += at25.o
obj-$(CONFIG_SPI_SPIDEV) += spidev.o
obj-$(CONFIG_SPI_TLE62X0) += tle62x0.o
# ... add above this line ...
diff --git a/drivers/spi/at25.c b/drivers/spi/at25.c
deleted file mode 100644
index 290dbe99647a..000000000000
--- a/drivers/spi/at25.c
+++ /dev/null
@@ -1,389 +0,0 @@
-/*
- * at25.c -- support most SPI EEPROMs, such as Atmel AT25 models
- *
- * Copyright (C) 2006 David Brownell
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- */
-
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/delay.h>
-#include <linux/device.h>
-#include <linux/sched.h>
-
-#include <linux/spi/spi.h>
-#include <linux/spi/eeprom.h>
-
-
-/*
- * NOTE: this is an *EEPROM* driver. The vagaries of product naming
- * mean that some AT25 products are EEPROMs, and others are FLASH.
- * Handle FLASH chips with the drivers/mtd/devices/m25p80.c driver,
- * not this one!
- */
-
-struct at25_data {
- struct spi_device *spi;
- struct mutex lock;
- struct spi_eeprom chip;
- struct bin_attribute bin;
- unsigned addrlen;
-};
-
-#define AT25_WREN 0x06 /* latch the write enable */
-#define AT25_WRDI 0x04 /* reset the write enable */
-#define AT25_RDSR 0x05 /* read status register */
-#define AT25_WRSR 0x01 /* write status register */
-#define AT25_READ 0x03 /* read byte(s) */
-#define AT25_WRITE 0x02 /* write byte(s)/sector */
-
-#define AT25_SR_nRDY 0x01 /* nRDY = write-in-progress */
-#define AT25_SR_WEN 0x02 /* write enable (latched) */
-#define AT25_SR_BP0 0x04 /* BP for software writeprotect */
-#define AT25_SR_BP1 0x08
-#define AT25_SR_WPEN 0x80 /* writeprotect enable */
-
-
-#define EE_MAXADDRLEN 3 /* 24 bit addresses, up to 2 MBytes */
-
-/* Specs often allow 5 msec for a page write, sometimes 20 msec;
- * it's important to recover from write timeouts.
- */
-#define EE_TIMEOUT 25
-
-/*-------------------------------------------------------------------------*/
-
-#define io_limit PAGE_SIZE /* bytes */
-
-static ssize_t
-at25_ee_read(
- struct at25_data *at25,
- char *buf,
- unsigned offset,
- size_t count
-)
-{
- u8 command[EE_MAXADDRLEN + 1];
- u8 *cp;
- ssize_t status;
- struct spi_transfer t[2];
- struct spi_message m;
-
- cp = command;
- *cp++ = AT25_READ;
-
- /* 8/16/24-bit address is written MSB first */
- switch (at25->addrlen) {
- default: /* case 3 */
- *cp++ = offset >> 16;
- case 2:
- *cp++ = offset >> 8;
- case 1:
- case 0: /* can't happen: for better codegen */
- *cp++ = offset >> 0;
- }
-
- spi_message_init(&m);
- memset(t, 0, sizeof t);
-
- t[0].tx_buf = command;
- t[0].len = at25->addrlen + 1;
- spi_message_add_tail(&t[0], &m);
-
- t[1].rx_buf = buf;
- t[1].len = count;
- spi_message_add_tail(&t[1], &m);
-
- mutex_lock(&at25->lock);
-
- /* Read it all at once.
- *
- * REVISIT that's potentially a problem with large chips, if
- * other devices on the bus need to be accessed regularly or
- * this chip is clocked very slowly
- */
- status = spi_sync(at25->spi, &m);
- dev_dbg(&at25->spi->dev,
- "read %Zd bytes at %d --> %d\n",
- count, offset, (int) status);
-
- mutex_unlock(&at25->lock);
- return status ? status : count;
-}
-
-static ssize_t
-at25_bin_read(struct kobject *kobj, struct bin_attribute *bin_attr,
- char *buf, loff_t off, size_t count)
-{
- struct device *dev;
- struct at25_data *at25;
-
- dev = container_of(kobj, struct device, kobj);
- at25 = dev_get_drvdata(dev);
-
- if (unlikely(off >= at25->bin.size))
- return 0;
- if ((off + count) > at25->bin.size)
- count = at25->bin.size - off;
- if (unlikely(!count))
- return count;
-
- return at25_ee_read(at25, buf, off, count);
-}
-
-
-static ssize_t
-at25_ee_write(struct at25_data *at25, char *buf, loff_t off, size_t count)
-{
- ssize_t status = 0;
- unsigned written = 0;
- unsigned buf_size;
- u8 *bounce;
-
- /* Temp buffer starts with command and address */
- buf_size = at25->chip.page_size;
- if (buf_size > io_limit)
- buf_size = io_limit;
- bounce = kmalloc(buf_size + at25->addrlen + 1, GFP_KERNEL);
- if (!bounce)
- return -ENOMEM;
-
- /* For write, rollover is within the page ... so we write at
- * most one page, then manually roll over to the next page.
- */
- bounce[0] = AT25_WRITE;
- mutex_lock(&at25->lock);
- do {
- unsigned long timeout, retries;
- unsigned segment;
- unsigned offset = (unsigned) off;
- u8 *cp = bounce + 1;
-
- *cp = AT25_WREN;
- status = spi_write(at25->spi, cp, 1);
- if (status < 0) {
- dev_dbg(&at25->spi->dev, "WREN --> %d\n",
- (int) status);
- break;
- }
-
- /* 8/16/24-bit address is written MSB first */
- switch (at25->addrlen) {
- default: /* case 3 */
- *cp++ = offset >> 16;
- case 2:
- *cp++ = offset >> 8;
- case 1:
- case 0: /* can't happen: for better codegen */
- *cp++ = offset >> 0;
- }
-
- /* Write as much of a page as we can */
- segment = buf_size - (offset % buf_size);
- if (segment > count)
- segment = count;
- memcpy(cp, buf, segment);
- status = spi_write(at25->spi, bounce,
- segment + at25->addrlen + 1);
- dev_dbg(&at25->spi->dev,
- "write %u bytes at %u --> %d\n",
- segment, offset, (int) status);
- if (status < 0)
- break;
-
- /* REVISIT this should detect (or prevent) failed writes
- * to readonly sections of the EEPROM...
- */
-
- /* Wait for non-busy status */
- timeout = jiffies + msecs_to_jiffies(EE_TIMEOUT);
- retries = 0;
- do {
- int sr;
-
- sr = spi_w8r8(at25->spi, AT25_RDSR);
- if (sr < 0 || (sr & AT25_SR_nRDY)) {
- dev_dbg(&at25->spi->dev,
- "rdsr --> %d (%02x)\n", sr, sr);
- /* at HZ=100, this is sloooow */
- msleep(1);
- continue;
- }
- if (!(sr & AT25_SR_nRDY))
- break;
- } while (retries++ < 3 || time_before_eq(jiffies, timeout));
-
- if (time_after(jiffies, timeout)) {
- dev_err(&at25->spi->dev,
- "write %d bytes offset %d, "
- "timeout after %u msecs\n",
- segment, offset,
- jiffies_to_msecs(jiffies -
- (timeout - EE_TIMEOUT)));
- status = -ETIMEDOUT;
- break;
- }
-
- off += segment;
- buf += segment;
- count -= segment;
- written += segment;
-
- } while (count > 0);
-
- mutex_unlock(&at25->lock);
-
- kfree(bounce);
- return written ? written : status;
-}
-
-static ssize_t
-at25_bin_write(struct kobject *kobj, struct bin_attribute *bin_attr,
- char *buf, loff_t off, size_t count)
-{
- struct device *dev;
- struct at25_data *at25;
-
- dev = container_of(kobj, struct device, kobj);
- at25 = dev_get_drvdata(dev);
-
- if (unlikely(off >= at25->bin.size))
- return -EFBIG;
- if ((off + count) > at25->bin.size)
- count = at25->bin.size - off;
- if (unlikely(!count))
- return count;
-
- return at25_ee_write(at25, buf, off, count);
-}
-
-/*-------------------------------------------------------------------------*/
-
-static int at25_probe(struct spi_device *spi)
-{
- struct at25_data *at25 = NULL;
- const struct spi_eeprom *chip;
- int err;
- int sr;
- int addrlen;
-
- /* Chip description */
- chip = spi->dev.platform_data;
- if (!chip) {
- dev_dbg(&spi->dev, "no chip description\n");
- err = -ENODEV;
- goto fail;
- }
-
- /* For now we only support 8/16/24 bit addressing */
- if (chip->flags & EE_ADDR1)
- addrlen = 1;
- else if (chip->flags & EE_ADDR2)
- addrlen = 2;
- else if (chip->flags & EE_ADDR3)
- addrlen = 3;
- else {
- dev_dbg(&spi->dev, "unsupported address type\n");
- err = -EINVAL;
- goto fail;
- }
-
- /* Ping the chip ... the status register is pretty portable,
- * unlike probing manufacturer IDs. We do expect that system
- * firmware didn't write it in the past few milliseconds!
- */
- sr = spi_w8r8(spi, AT25_RDSR);
- if (sr < 0 || sr & AT25_SR_nRDY) {
- dev_dbg(&spi->dev, "rdsr --> %d (%02x)\n", sr, sr);
- err = -ENXIO;
- goto fail;
- }
-
- if (!(at25 = kzalloc(sizeof *at25, GFP_KERNEL))) {
- err = -ENOMEM;
- goto fail;
- }
-
- mutex_init(&at25->lock);
- at25->chip = *chip;
- at25->spi = spi_dev_get(spi);
- dev_set_drvdata(&spi->dev, at25);
- at25->addrlen = addrlen;
-
- /* Export the EEPROM bytes through sysfs, since that's convenient.
- * Default to root-only access to the data; EEPROMs often hold data
- * that's sensitive for read and/or write, like ethernet addresses,
- * security codes, board-specific manufacturing calibrations, etc.
- */
- at25->bin.attr.name = "eeprom";
- at25->bin.attr.mode = S_IRUSR;
- at25->bin.read = at25_bin_read;
-
- at25->bin.size = at25->chip.byte_len;
- if (!(chip->flags & EE_READONLY)) {
- at25->bin.write = at25_bin_write;
- at25->bin.attr.mode |= S_IWUSR;
- }
-
- err = sysfs_create_bin_file(&spi->dev.kobj, &at25->bin);
- if (err)
- goto fail;
-
- dev_info(&spi->dev, "%Zd %s %s eeprom%s, pagesize %u\n",
- (at25->bin.size < 1024)
- ? at25->bin.size
- : (at25->bin.size / 1024),
- (at25->bin.size < 1024) ? "Byte" : "KByte",
- at25->chip.name,
- (chip->flags & EE_READONLY) ? " (readonly)" : "",
- at25->chip.page_size);
- return 0;
-fail:
- dev_dbg(&spi->dev, "probe err %d\n", err);
- kfree(at25);
- return err;
-}
-
-static int __devexit at25_remove(struct spi_device *spi)
-{
- struct at25_data *at25;
-
- at25 = dev_get_drvdata(&spi->dev);
- sysfs_remove_bin_file(&spi->dev.kobj, &at25->bin);
- kfree(at25);
- return 0;
-}
-
-/*-------------------------------------------------------------------------*/
-
-static struct spi_driver at25_driver = {
- .driver = {
- .name = "at25",
- .owner = THIS_MODULE,
- },
- .probe = at25_probe,
- .remove = __devexit_p(at25_remove),
-};
-
-static int __init at25_init(void)
-{
- return spi_register_driver(&at25_driver);
-}
-module_init(at25_init);
-
-static void __exit at25_exit(void)
-{
- spi_unregister_driver(&at25_driver);
-}
-module_exit(at25_exit);
-
-MODULE_DESCRIPTION("Driver for most SPI EEPROMs");
-MODULE_AUTHOR("David Brownell");
-MODULE_LICENSE("GPL");
-
diff --git a/drivers/spi/atmel_spi.c b/drivers/spi/atmel_spi.c
index 5e39bac9c51b..56ff3e6864ea 100644
--- a/drivers/spi/atmel_spi.c
+++ b/drivers/spi/atmel_spi.c
@@ -670,8 +670,7 @@ static int atmel_spi_transfer(struct spi_device *spi, struct spi_message *msg)
dev_dbg(controller, "new message %p submitted for %s\n",
msg, spi->dev.bus_id);
- if (unlikely(list_empty(&msg->transfers)
- || !spi->max_speed_hz))
+ if (unlikely(list_empty(&msg->transfers)))
return -EINVAL;
if (as->stopping)
diff --git a/drivers/spi/xilinx_spi.c b/drivers/spi/xilinx_spi.c
index 68d6f4988fb5..fe7e5f35e5d0 100644
--- a/drivers/spi/xilinx_spi.c
+++ b/drivers/spi/xilinx_spi.c
@@ -15,12 +15,15 @@
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
+
+#include <linux/of_platform.h>
+#include <linux/of_device.h>
+#include <linux/of_spi.h>
+
#include <linux/spi/spi.h>
#include <linux/spi/spi_bitbang.h>
#include <linux/io.h>
-#include <syslib/virtex_devices.h>
-
#define XILINX_SPI_NAME "xilinx_spi"
/* Register definitions as per "OPB Serial Peripheral Interface (SPI) (v1.00e)
@@ -144,23 +147,14 @@ static int xilinx_spi_setup_transfer(struct spi_device *spi,
struct spi_transfer *t)
{
u8 bits_per_word;
- u32 hz;
- struct xilinx_spi *xspi = spi_master_get_devdata(spi->master);
bits_per_word = (t) ? t->bits_per_word : spi->bits_per_word;
- hz = (t) ? t->speed_hz : spi->max_speed_hz;
if (bits_per_word != 8) {
dev_err(&spi->dev, "%s, unsupported bits_per_word=%d\n",
__func__, bits_per_word);
return -EINVAL;
}
- if (hz && xspi->speed_hz > hz) {
- dev_err(&spi->dev, "%s, unsupported clock rate %uHz\n",
- __func__, hz);
- return -EINVAL;
- }
-
return 0;
}
@@ -304,32 +298,38 @@ static irqreturn_t xilinx_spi_irq(int irq, void *dev_id)
return IRQ_HANDLED;
}
-static int __init xilinx_spi_probe(struct platform_device *dev)
+static int __init xilinx_spi_of_probe(struct of_device *ofdev,
+ const struct of_device_id *match)
{
- int ret = 0;
struct spi_master *master;
struct xilinx_spi *xspi;
- struct xspi_platform_data *pdata;
- struct resource *r;
+ struct resource r_irq_struct;
+ struct resource r_mem_struct;
+
+ struct resource *r_irq = &r_irq_struct;
+ struct resource *r_mem = &r_mem_struct;
+ int rc = 0;
+ const u32 *prop;
+ int len;
/* Get resources(memory, IRQ) associated with the device */
- master = spi_alloc_master(&dev->dev, sizeof(struct xilinx_spi));
+ master = spi_alloc_master(&ofdev->dev, sizeof(struct xilinx_spi));
if (master == NULL) {
return -ENOMEM;
}
- platform_set_drvdata(dev, master);
- pdata = dev->dev.platform_data;
+ dev_set_drvdata(&ofdev->dev, master);
- if (pdata == NULL) {
- ret = -ENODEV;
+ rc = of_address_to_resource(ofdev->node, 0, r_mem);
+ if (rc) {
+ dev_warn(&ofdev->dev, "invalid address\n");
goto put_master;
}
- r = platform_get_resource(dev, IORESOURCE_MEM, 0);
- if (r == NULL) {
- ret = -ENODEV;
+ rc = of_irq_to_resource(ofdev->node, 0, r_irq);
+ if (rc == NO_IRQ) {
+ dev_warn(&ofdev->dev, "no IRQ found\n");
goto put_master;
}
@@ -341,47 +341,57 @@ static int __init xilinx_spi_probe(struct platform_device *dev)
xspi->bitbang.master->setup = xilinx_spi_setup;
init_completion(&xspi->done);
- if (!request_mem_region(r->start,
- r->end - r->start + 1, XILINX_SPI_NAME)) {
- ret = -ENXIO;
+ xspi->irq = r_irq->start;
+
+ if (!request_mem_region(r_mem->start,
+ r_mem->end - r_mem->start + 1, XILINX_SPI_NAME)) {
+ rc = -ENXIO;
+ dev_warn(&ofdev->dev, "memory request failure\n");
goto put_master;
}
- xspi->regs = ioremap(r->start, r->end - r->start + 1);
+ xspi->regs = ioremap(r_mem->start, r_mem->end - r_mem->start + 1);
if (xspi->regs == NULL) {
- ret = -ENOMEM;
+ rc = -ENOMEM;
+ dev_warn(&ofdev->dev, "ioremap failure\n");
goto put_master;
}
+ xspi->irq = r_irq->start;
- ret = platform_get_irq(dev, 0);
- if (ret < 0) {
- ret = -ENXIO;
- goto unmap_io;
- }
- xspi->irq = ret;
+ /* dynamic bus assignment */
+ master->bus_num = -1;
- master->bus_num = pdata->bus_num;
- master->num_chipselect = pdata->num_chipselect;
- xspi->speed_hz = pdata->speed_hz;
+ /* number of slave select bits is required */
+ prop = of_get_property(ofdev->node, "xlnx,num-ss-bits", &len);
+ if (!prop || len < sizeof(*prop)) {
+ dev_warn(&ofdev->dev, "no 'xlnx,num-ss-bits' property\n");
+ goto put_master;
+ }
+ master->num_chipselect = *prop;
/* SPI controller initializations */
xspi_init_hw(xspi->regs);
/* Register for SPI Interrupt */
- ret = request_irq(xspi->irq, xilinx_spi_irq, 0, XILINX_SPI_NAME, xspi);
- if (ret != 0)
+ rc = request_irq(xspi->irq, xilinx_spi_irq, 0, XILINX_SPI_NAME, xspi);
+ if (rc != 0) {
+ dev_warn(&ofdev->dev, "irq request failure: %d\n", xspi->irq);
goto unmap_io;
+ }
- ret = spi_bitbang_start(&xspi->bitbang);
- if (ret != 0) {
- dev_err(&dev->dev, "spi_bitbang_start FAILED\n");
+ rc = spi_bitbang_start(&xspi->bitbang);
+ if (rc != 0) {
+ dev_err(&ofdev->dev, "spi_bitbang_start FAILED\n");
goto free_irq;
}
- dev_info(&dev->dev, "at 0x%08X mapped to 0x%08X, irq=%d\n",
- r->start, (u32)xspi->regs, xspi->irq);
+ dev_info(&ofdev->dev, "at 0x%08X mapped to 0x%08X, irq=%d\n",
+ (unsigned int)r_mem->start, (u32)xspi->regs, xspi->irq);
- return ret;
+ /* Add any subnodes on the SPI bus */
+ of_register_spi_devices(master, ofdev->node);
+
+ return rc;
free_irq:
free_irq(xspi->irq, xspi);
@@ -389,21 +399,21 @@ unmap_io:
iounmap(xspi->regs);
put_master:
spi_master_put(master);
- return ret;
+ return rc;
}
-static int __devexit xilinx_spi_remove(struct platform_device *dev)
+static int __devexit xilinx_spi_remove(struct of_device *ofdev)
{
struct xilinx_spi *xspi;
struct spi_master *master;
- master = platform_get_drvdata(dev);
+ master = platform_get_drvdata(ofdev);
xspi = spi_master_get_devdata(master);
spi_bitbang_stop(&xspi->bitbang);
free_irq(xspi->irq, xspi);
iounmap(xspi->regs);
- platform_set_drvdata(dev, 0);
+ dev_set_drvdata(&ofdev->dev, 0);
spi_master_put(xspi->bitbang.master);
return 0;
@@ -412,27 +422,42 @@ static int __devexit xilinx_spi_remove(struct platform_device *dev)
/* work with hotplug and coldplug */
MODULE_ALIAS("platform:" XILINX_SPI_NAME);
-static struct platform_driver xilinx_spi_driver = {
- .probe = xilinx_spi_probe,
- .remove = __devexit_p(xilinx_spi_remove),
+static int __exit xilinx_spi_of_remove(struct of_device *op)
+{
+ return xilinx_spi_remove(op);
+}
+
+static struct of_device_id xilinx_spi_of_match[] = {
+ { .compatible = "xlnx,xps-spi-2.00.a", },
+ { .compatible = "xlnx,xps-spi-2.00.b", },
+ {}
+};
+
+MODULE_DEVICE_TABLE(of, xilinx_spi_of_match);
+
+static struct of_platform_driver xilinx_spi_of_driver = {
+ .owner = THIS_MODULE,
+ .name = "xilinx-xps-spi",
+ .match_table = xilinx_spi_of_match,
+ .probe = xilinx_spi_of_probe,
+ .remove = __exit_p(xilinx_spi_of_remove),
.driver = {
- .name = XILINX_SPI_NAME,
+ .name = "xilinx-xps-spi",
.owner = THIS_MODULE,
},
};
static int __init xilinx_spi_init(void)
{
- return platform_driver_register(&xilinx_spi_driver);
+ return of_register_platform_driver(&xilinx_spi_of_driver);
}
module_init(xilinx_spi_init);
static void __exit xilinx_spi_exit(void)
{
- platform_driver_unregister(&xilinx_spi_driver);
+ of_unregister_platform_driver(&xilinx_spi_of_driver);
}
module_exit(xilinx_spi_exit);
-
MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>");
MODULE_DESCRIPTION("Xilinx SPI driver");
MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-28 12:46:05 +0300