mirror of
https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git
synced 2026-10-30 03:27:44 -04:00
i2c: Convert i2c-octeon.c to use device tree.
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 <[email protected]> Acked-by: Rob Herring <[email protected]> Acked-by: Wolfram Sang <[email protected]> Cc: [email protected] Cc: [email protected] Cc: Grant Likely <[email protected]> Cc: [email protected] Patchwork: https://patchwork.linux-mips.org/patch/3939/ Signed-off-by: Ralf Baechle <[email protected]>
This commit is contained in:
David Daney
Ralf Baechle
parent
a0c16582b5
commit
f353a218de
4 changed files with 49 additions and 134 deletions
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@ -2,7 +2,7 @@
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* (C) Copyright 2009-2010
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* Nokia Siemens Networks, michael.lawnick.ext@nsn.com
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*
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* Portions Copyright (C) 2010 Cavium Networks, Inc.
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* Portions Copyright (C) 2010, 2011 Cavium Networks, Inc.
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*
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* This is a driver for the i2c adapter in Cavium Networks' OCTEON processors.
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*
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@ -11,17 +11,18 @@
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of_i2c.h>
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/i2c.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <asm/octeon/octeon.h>
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@ -65,7 +66,7 @@ struct octeon_i2c {
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wait_queue_head_t queue;
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struct i2c_adapter adap;
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int irq;
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int twsi_freq;
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u32 twsi_freq;
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int sys_freq;
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resource_size_t twsi_phys;
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void __iomem *twsi_base;
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@ -121,10 +122,8 @@ static u8 octeon_i2c_read_sw(struct octeon_i2c *i2c, u64 eop_reg)
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*/
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static void octeon_i2c_write_int(struct octeon_i2c *i2c, u64 data)
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{
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u64 tmp;
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__raw_writeq(data, i2c->twsi_base + TWSI_INT);
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tmp = __raw_readq(i2c->twsi_base + TWSI_INT);
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__raw_readq(i2c->twsi_base + TWSI_INT);
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}
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/**
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@ -515,7 +514,6 @@ static int __devinit octeon_i2c_probe(struct platform_device *pdev)
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{
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int irq, result = 0;
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struct octeon_i2c *i2c;
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struct octeon_i2c_data *i2c_data;
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struct resource *res_mem;
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/* All adaptors have an irq. */
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@ -523,86 +521,90 @@ static int __devinit octeon_i2c_probe(struct platform_device *pdev)
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if (irq < 0)
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return irq;
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i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
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i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);
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if (!i2c) {
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dev_err(&pdev->dev, "kzalloc failed\n");
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result = -ENOMEM;
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goto out;
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}
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i2c->dev = &pdev->dev;
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i2c_data = pdev->dev.platform_data;
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res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (res_mem == NULL) {
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dev_err(i2c->dev, "found no memory resource\n");
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result = -ENXIO;
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goto fail_region;
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goto out;
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}
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if (i2c_data == NULL) {
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dev_err(i2c->dev, "no I2C frequency data\n");
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result = -ENXIO;
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goto fail_region;
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}
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i2c->twsi_phys = res_mem->start;
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i2c->regsize = resource_size(res_mem);
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i2c->twsi_freq = i2c_data->i2c_freq;
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i2c->sys_freq = i2c_data->sys_freq;
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if (!request_mem_region(i2c->twsi_phys, i2c->regsize, res_mem->name)) {
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dev_err(i2c->dev, "request_mem_region failed\n");
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goto fail_region;
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/*
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* "clock-rate" is a legacy binding, the official binding is
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* "clock-frequency". Try the official one first and then
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* fall back if it doesn't exist.
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*/
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if (of_property_read_u32(pdev->dev.of_node,
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"clock-frequency", &i2c->twsi_freq) &&
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of_property_read_u32(pdev->dev.of_node,
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"clock-rate", &i2c->twsi_freq)) {
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dev_err(i2c->dev,
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"no I2C 'clock-rate' or 'clock-frequency' property\n");
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result = -ENXIO;
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goto out;
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}
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i2c->twsi_base = ioremap(i2c->twsi_phys, i2c->regsize);
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i2c->sys_freq = octeon_get_io_clock_rate();
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if (!devm_request_mem_region(&pdev->dev, i2c->twsi_phys, i2c->regsize,
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res_mem->name)) {
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dev_err(i2c->dev, "request_mem_region failed\n");
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goto out;
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}
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i2c->twsi_base = devm_ioremap(&pdev->dev, i2c->twsi_phys, i2c->regsize);
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init_waitqueue_head(&i2c->queue);
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i2c->irq = irq;
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result = request_irq(i2c->irq, octeon_i2c_isr, 0, DRV_NAME, i2c);
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result = devm_request_irq(&pdev->dev, i2c->irq,
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octeon_i2c_isr, 0, DRV_NAME, i2c);
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if (result < 0) {
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dev_err(i2c->dev, "failed to attach interrupt\n");
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goto fail_irq;
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goto out;
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}
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result = octeon_i2c_initlowlevel(i2c);
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if (result) {
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dev_err(i2c->dev, "init low level failed\n");
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goto fail_add;
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goto out;
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}
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result = octeon_i2c_setclock(i2c);
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if (result) {
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dev_err(i2c->dev, "clock init failed\n");
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goto fail_add;
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goto out;
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}
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i2c->adap = octeon_i2c_ops;
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i2c->adap.dev.parent = &pdev->dev;
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i2c->adap.nr = pdev->id >= 0 ? pdev->id : 0;
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i2c->adap.dev.of_node = pdev->dev.of_node;
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i2c_set_adapdata(&i2c->adap, i2c);
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platform_set_drvdata(pdev, i2c);
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result = i2c_add_numbered_adapter(&i2c->adap);
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result = i2c_add_adapter(&i2c->adap);
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if (result < 0) {
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dev_err(i2c->dev, "failed to add adapter\n");
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goto fail_add;
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}
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dev_info(i2c->dev, "version %s\n", DRV_VERSION);
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return result;
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of_i2c_register_devices(&i2c->adap);
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return 0;
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fail_add:
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platform_set_drvdata(pdev, NULL);
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free_irq(i2c->irq, i2c);
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fail_irq:
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iounmap(i2c->twsi_base);
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release_mem_region(i2c->twsi_phys, i2c->regsize);
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fail_region:
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kfree(i2c);
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out:
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return result;
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};
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@ -613,19 +615,24 @@ static int __devexit octeon_i2c_remove(struct platform_device *pdev)
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i2c_del_adapter(&i2c->adap);
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platform_set_drvdata(pdev, NULL);
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free_irq(i2c->irq, i2c);
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iounmap(i2c->twsi_base);
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release_mem_region(i2c->twsi_phys, i2c->regsize);
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kfree(i2c);
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return 0;
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};
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static struct of_device_id octeon_i2c_match[] = {
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{
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.compatible = "cavium,octeon-3860-twsi",
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},
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{},
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};
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MODULE_DEVICE_TABLE(of, octeon_i2c_match);
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static struct platform_driver octeon_i2c_driver = {
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.probe = octeon_i2c_probe,
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.remove = __devexit_p(octeon_i2c_remove),
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.driver = {
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.owner = THIS_MODULE,
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.name = DRV_NAME,
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.of_match_table = octeon_i2c_match,
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},
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};
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@ -635,4 +642,3 @@ MODULE_AUTHOR("Michael Lawnick <[email protected]>");
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MODULE_DESCRIPTION("I2C-Bus adapter for Cavium OCTEON processors");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(DRV_VERSION);
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MODULE_ALIAS("platform:" DRV_NAME);
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