[PATCH v2 1/5] i2c: Convert i2c-octeon.c to use device tree.

From: David Daney
Date: Thu Apr 26 2012 - 21:20:44 EST

From: David Daney <david.daney@xxxxxxxxxx>

There are three parts to this:

1) Remove the definitions of OCTEON_IRQ_TWSI and OCTEON_IRQ_TWSI2.
The interrupts are specified by the device tree and these hard
coded irq numbers block the used of the irq lines by the irq_domain
code.

2) Remove platform device setup code from octeon-platform.c, it is
now unused.

3) Convert i2c-octeon.c to use device tree. Part of this includes
using the devm_* functions instead of the raw counterparts, thus
simplifying error handling. No functionality is changed.

Signed-off-by: David Daney <david.daney@xxxxxxxxxx>
Acked-by: Rob Herring <rob.herring@xxxxxxxxxxx>
Cc: "Jean Delvare (PC drivers, core)" <khali@xxxxxxxxxxxx>
Cc: "Ben Dooks (embedded platforms)" <ben-linux@xxxxxxxxx>
Cc: "Wolfram Sang (embedded platforms)" <w.sang@xxxxxxxxxxxxxx>
Cc: linux-i2c@xxxxxxxxxxxxxxx
---
arch/mips/cavium-octeon/octeon-irq.c | 2 -
arch/mips/cavium-octeon/octeon-platform.c | 84 --------------------------
arch/mips/include/asm/octeon/octeon.h | 5 --
drivers/i2c/busses/i2c-octeon.c | 92 +++++++++++++++-------------
4 files changed, 49 insertions(+), 134 deletions(-)

diff --git a/arch/mips/cavium-octeon/octeon-irq.c b/arch/mips/cavium-octeon/octeon-irq.c
index fc40d0b..c6b0b41 100644
--- a/arch/mips/cavium-octeon/octeon-irq.c
+++ b/arch/mips/cavium-octeon/octeon-irq.c
@@ -1183,13 +1183,11 @@ static void __init octeon_irq_init_ciu(void)
for (i = 0; i < 4; i++)
octeon_irq_set_ciu_mapping(i + OCTEON_IRQ_PCI_MSI0, 0, i + 40, chip, handle_level_irq);

- octeon_irq_set_ciu_mapping(OCTEON_IRQ_TWSI, 0, 45, chip, handle_level_irq);
octeon_irq_set_ciu_mapping(OCTEON_IRQ_RML, 0, 46, chip, handle_level_irq);
for (i = 0; i < 4; i++)
octeon_irq_set_ciu_mapping(i + OCTEON_IRQ_TIMER0, 0, i + 52, chip, handle_edge_irq);

octeon_irq_set_ciu_mapping(OCTEON_IRQ_USB0, 0, 56, chip, handle_level_irq);
- octeon_irq_set_ciu_mapping(OCTEON_IRQ_TWSI2, 0, 59, chip, handle_level_irq);
octeon_irq_set_ciu_mapping(OCTEON_IRQ_MII0, 0, 62, chip, handle_level_irq);
octeon_irq_set_ciu_mapping(OCTEON_IRQ_BOOTDMA, 0, 63, chip, handle_level_irq);

diff --git a/arch/mips/cavium-octeon/octeon-platform.c b/arch/mips/cavium-octeon/octeon-platform.c
index 2754bc2..f62a40f 100644
--- a/arch/mips/cavium-octeon/octeon-platform.c
+++ b/arch/mips/cavium-octeon/octeon-platform.c
@@ -168,90 +168,6 @@ out:
}
device_initcall(octeon_rng_device_init);

-static struct i2c_board_info __initdata octeon_i2c_devices[] = {
- {
- I2C_BOARD_INFO("ds1337", 0x68),
- },
-};
-
-static int __init octeon_i2c_devices_init(void)
-{
- return i2c_register_board_info(0, octeon_i2c_devices,
- ARRAY_SIZE(octeon_i2c_devices));
-}
-arch_initcall(octeon_i2c_devices_init);
-
-#define OCTEON_I2C_IO_BASE 0x1180000001000ull
-#define OCTEON_I2C_IO_UNIT_OFFSET 0x200
-
-static struct octeon_i2c_data octeon_i2c_data[2];
-
-static int __init octeon_i2c_device_init(void)
-{
- struct platform_device *pd;
- int ret = 0;
- int port, num_ports;
-
- struct resource i2c_resources[] = {
- {
- .flags = IORESOURCE_MEM,
- }, {
- .flags = IORESOURCE_IRQ,
- }
- };
-
- if (OCTEON_IS_MODEL(OCTEON_CN56XX) || OCTEON_IS_MODEL(OCTEON_CN52XX))
- num_ports = 2;
- else
- num_ports = 1;
-
- for (port = 0; port < num_ports; port++) {
- octeon_i2c_data[port].sys_freq = octeon_get_io_clock_rate();
- /*FIXME: should be examined. At the moment is set for 100Khz */
- octeon_i2c_data[port].i2c_freq = 100000;
-
- pd = platform_device_alloc("i2c-octeon", port);
- if (!pd) {
- ret = -ENOMEM;
- goto out;
- }
-
- pd->dev.platform_data = octeon_i2c_data + port;
-
- i2c_resources[0].start =
- OCTEON_I2C_IO_BASE + (port * OCTEON_I2C_IO_UNIT_OFFSET);
- i2c_resources[0].end = i2c_resources[0].start + 0x1f;
- switch (port) {
- case 0:
- i2c_resources[1].start = OCTEON_IRQ_TWSI;
- i2c_resources[1].end = OCTEON_IRQ_TWSI;
- break;
- case 1:
- i2c_resources[1].start = OCTEON_IRQ_TWSI2;
- i2c_resources[1].end = OCTEON_IRQ_TWSI2;
- break;
- default:
- BUG();
- }
-
- ret = platform_device_add_resources(pd,
- i2c_resources,
- ARRAY_SIZE(i2c_resources));
- if (ret)
- goto fail;
-
- ret = platform_device_add(pd);
- if (ret)
- goto fail;
- }
- return ret;
-fail:
- platform_device_put(pd);
-out:
- return ret;
-}
-device_initcall(octeon_i2c_device_init);
-
/* Octeon SMI/MDIO interface. */
static int __init octeon_mdiobus_device_init(void)
{
diff --git a/arch/mips/include/asm/octeon/octeon.h b/arch/mips/include/asm/octeon/octeon.h
index f72f768..1e2486e 100644
--- a/arch/mips/include/asm/octeon/octeon.h
+++ b/arch/mips/include/asm/octeon/octeon.h
@@ -215,11 +215,6 @@ struct octeon_cf_data {
int dma_engine; /* -1 for no DMA */
};

-struct octeon_i2c_data {
- unsigned int sys_freq;
- unsigned int i2c_freq;
-};
-
extern void octeon_write_lcd(const char *s);
extern void octeon_check_cpu_bist(void);
extern int octeon_get_boot_debug_flag(void);
diff --git a/drivers/i2c/busses/i2c-octeon.c b/drivers/i2c/busses/i2c-octeon.c
index ee139a5..f44c835 100644
--- a/drivers/i2c/busses/i2c-octeon.c
+++ b/drivers/i2c/busses/i2c-octeon.c
@@ -2,7 +2,7 @@
* (C) Copyright 2009-2010
* Nokia Siemens Networks, michael.lawnick.ext@xxxxxxx
*
- * Portions Copyright (C) 2010 Cavium Networks, Inc.
+ * Portions Copyright (C) 2010, 2011 Cavium Networks, Inc.
*
* This is a driver for the i2c adapter in Cavium Networks' OCTEON processors.
*
@@ -11,17 +11,18 @@
* warranty of any kind, whether express or implied.
*/

+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
+#include <linux/of_i2c.h>
+#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/init.h>
-
-#include <linux/io.h>
#include <linux/i2c.h>
-#include <linux/interrupt.h>
-#include <linux/delay.h>
-#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/of.h>

#include <asm/octeon/octeon.h>

@@ -65,7 +66,7 @@ struct octeon_i2c {
wait_queue_head_t queue;
struct i2c_adapter adap;
int irq;
- int twsi_freq;
+ u32 twsi_freq;
int sys_freq;
resource_size_t twsi_phys;
void __iomem *twsi_base;
@@ -121,10 +122,8 @@ static u8 octeon_i2c_read_sw(struct octeon_i2c *i2c, u64 eop_reg)
*/
static void octeon_i2c_write_int(struct octeon_i2c *i2c, u64 data)
{
- u64 tmp;
-
__raw_writeq(data, i2c->twsi_base + TWSI_INT);
- tmp = __raw_readq(i2c->twsi_base + TWSI_INT);
+ __raw_readq(i2c->twsi_base + TWSI_INT);
}

/**
@@ -515,7 +514,6 @@ static int __devinit octeon_i2c_probe(struct platform_device *pdev)
{
int irq, result = 0;
struct octeon_i2c *i2c;
- struct octeon_i2c_data *i2c_data;
struct resource *res_mem;

/* All adaptors have an irq. */
@@ -523,86 +521,90 @@ static int __devinit octeon_i2c_probe(struct platform_device *pdev)
if (irq < 0)
return irq;

- i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
+ i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);
if (!i2c) {
dev_err(&pdev->dev, "kzalloc failed\n");
result = -ENOMEM;
goto out;
}
i2c->dev = &pdev->dev;
- i2c_data = pdev->dev.platform_data;

res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);

if (res_mem == NULL) {
dev_err(i2c->dev, "found no memory resource\n");
result = -ENXIO;
- goto fail_region;
+ goto out;
}
+ i2c->twsi_phys = res_mem->start;
+ i2c->regsize = resource_size(res_mem);

- if (i2c_data == NULL) {
- dev_err(i2c->dev, "no I2C frequency data\n");
+ /*
+ * "clock-rate" is a legacy binding, the official binding is
+ * "clock-frequency". Try the official one first and then
+ * fall back if it doesn't exist.
+ */
+ if (of_property_read_u32(pdev->dev.of_node,
+ "clock-frequency", &i2c->twsi_freq) &&
+ of_property_read_u32(pdev->dev.of_node,
+ "clock-rate", &i2c->twsi_freq)) {
+ dev_err(i2c->dev,
+ "no I2C 'clock-rate' or 'clock-frequency' property\n");
result = -ENXIO;
- goto fail_region;
+ goto out;
}

- i2c->twsi_phys = res_mem->start;
- i2c->regsize = resource_size(res_mem);
- i2c->twsi_freq = i2c_data->i2c_freq;
- i2c->sys_freq = i2c_data->sys_freq;
+ i2c->sys_freq = octeon_get_io_clock_rate();

- if (!request_mem_region(i2c->twsi_phys, i2c->regsize, res_mem->name)) {
+ if (!devm_request_mem_region(&pdev->dev, i2c->twsi_phys, i2c->regsize,
+ res_mem->name)) {
dev_err(i2c->dev, "request_mem_region failed\n");
- goto fail_region;
+ goto out;
}
- i2c->twsi_base = ioremap(i2c->twsi_phys, i2c->regsize);
+ i2c->twsi_base = devm_ioremap(&pdev->dev, i2c->twsi_phys, i2c->regsize);

init_waitqueue_head(&i2c->queue);

i2c->irq = irq;

- result = request_irq(i2c->irq, octeon_i2c_isr, 0, DRV_NAME, i2c);
+ result = devm_request_irq(&pdev->dev, i2c->irq,
+ octeon_i2c_isr, 0, DRV_NAME, i2c);
if (result < 0) {
dev_err(i2c->dev, "failed to attach interrupt\n");
- goto fail_irq;
+ goto out;
}

result = octeon_i2c_initlowlevel(i2c);
if (result) {
dev_err(i2c->dev, "init low level failed\n");
- goto fail_add;
+ goto out;
}

result = octeon_i2c_setclock(i2c);
if (result) {
dev_err(i2c->dev, "clock init failed\n");
- goto fail_add;
+ goto out;
}

i2c->adap = octeon_i2c_ops;
i2c->adap.dev.parent = &pdev->dev;
- i2c->adap.nr = pdev->id >= 0 ? pdev->id : 0;
+ i2c->adap.dev.of_node = pdev->dev.of_node;
i2c_set_adapdata(&i2c->adap, i2c);
platform_set_drvdata(pdev, i2c);

- result = i2c_add_numbered_adapter(&i2c->adap);
+ result = i2c_add_adapter(&i2c->adap);
if (result < 0) {
dev_err(i2c->dev, "failed to add adapter\n");
goto fail_add;
}
-
dev_info(i2c->dev, "version %s\n", DRV_VERSION);

- return result;
+ of_i2c_register_devices(&i2c->adap);
+
+ return 0;

fail_add:
platform_set_drvdata(pdev, NULL);
- free_irq(i2c->irq, i2c);
-fail_irq:
- iounmap(i2c->twsi_base);
- release_mem_region(i2c->twsi_phys, i2c->regsize);
-fail_region:
- kfree(i2c);
out:
return result;
};
@@ -613,19 +615,24 @@ static int __devexit octeon_i2c_remove(struct platform_device *pdev)

i2c_del_adapter(&i2c->adap);
platform_set_drvdata(pdev, NULL);
- free_irq(i2c->irq, i2c);
- iounmap(i2c->twsi_base);
- release_mem_region(i2c->twsi_phys, i2c->regsize);
- kfree(i2c);
return 0;
};

+static struct of_device_id octeon_i2c_match[] = {
+ {
+ .compatible = "cavium,octeon-3860-twsi",
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(of, octeon_i2c_match);
+
static struct platform_driver octeon_i2c_driver = {
.probe = octeon_i2c_probe,
.remove = __devexit_p(octeon_i2c_remove),
.driver = {
.owner = THIS_MODULE,
.name = DRV_NAME,
+ .of_match_table = octeon_i2c_match,
},
};

@@ -635,4 +642,3 @@ MODULE_AUTHOR("Michael Lawnick <michael.lawnick.ext@xxxxxxx>");
MODULE_DESCRIPTION("I2C-Bus adapter for Cavium OCTEON processors");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
-MODULE_ALIAS("platform:" DRV_NAME);
--
1.7.2.3

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