From f353a218de6393fb43a5e81c3adbe1aac1a871ab Mon Sep 17 00:00:00 2001 From: David Daney Date: Thu, 5 Jul 2012 18:12:39 +0200 Subject: 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 Acked-by: Rob Herring Acked-by: Wolfram Sang Cc: linux-mips@linux-mips.org Cc: devicetree-discuss@lists.ozlabs.org Cc: Grant Likely Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/3939/ Signed-off-by: Ralf Baechle --- drivers/i2c/busses/i2c-octeon.c | 92 ++++++++++++++++++++++------------------- 1 file changed, 49 insertions(+), 43 deletions(-) (limited to 'drivers/i2c') diff --git a/drivers/i2c/busses/i2c-octeon.c b/drivers/i2c/busses/i2c-octeon.c index ee139a598814..f44c83549fe5 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@nsn.com * - * 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 +#include #include #include +#include +#include #include #include #include - -#include #include -#include -#include -#include +#include +#include #include @@ -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 "); MODULE_DESCRIPTION("I2C-Bus adapter for Cavium OCTEON processors"); MODULE_LICENSE("GPL"); MODULE_VERSION(DRV_VERSION); -MODULE_ALIAS("platform:" DRV_NAME); -- cgit v1.2.3