7  * This is a driver for the i2c adapter in Cavium Networks' OCTEON processors.
16 #include <linux/i2c.h>
27 #include "i2c-octeon-core.h"
29 #define DRV_NAME "i2c-octeon"
33  * @i2c: The struct octeon_i2c
38 static void octeon_i2c_int_enable(struct octeon_i2c *i2c)  in octeon_i2c_int_enable()  argument
40 	octeon_i2c_write_int(i2c, TWSI_INT_CORE_EN);  in octeon_i2c_int_enable()
44 static void octeon_i2c_int_disable(struct octeon_i2c *i2c)  in octeon_i2c_int_disable()  argument
47 	octeon_i2c_write_int(i2c, 0);  in octeon_i2c_int_disable()
52  * @i2c: The struct octeon_i2c
57 static void octeon_i2c_int_enable78(struct octeon_i2c *i2c)  in octeon_i2c_int_enable78()  argument
59 	atomic_inc_return(&i2c->int_enable_cnt);  in octeon_i2c_int_enable78()
60 	enable_irq(i2c->irq);  in octeon_i2c_int_enable78()
78 static void octeon_i2c_int_disable78(struct octeon_i2c *i2c)  in octeon_i2c_int_disable78()  argument
80 	__octeon_i2c_irq_disable(&i2c->int_enable_cnt, i2c->irq);  in octeon_i2c_int_disable78()
85  * @i2c: The struct octeon_i2c
90 static void octeon_i2c_hlc_int_enable78(struct octeon_i2c *i2c)  in octeon_i2c_hlc_int_enable78()  argument
92 	atomic_inc_return(&i2c->hlc_int_enable_cnt);  in octeon_i2c_hlc_int_enable78()
93 	enable_irq(i2c->hlc_irq);  in octeon_i2c_hlc_int_enable78()
97 static void octeon_i2c_hlc_int_disable78(struct octeon_i2c *i2c)  in octeon_i2c_hlc_int_disable78()  argument
99 	__octeon_i2c_irq_disable(&i2c->hlc_int_enable_cnt, i2c->hlc_irq);  in octeon_i2c_hlc_int_disable78()
105 	struct octeon_i2c *i2c = dev_id;  in octeon_i2c_hlc_isr78()  local
107 	i2c->hlc_int_disable(i2c);  in octeon_i2c_hlc_isr78()
108 	wake_up(&i2c->queue);  in octeon_i2c_hlc_isr78()
113 static void octeon_i2c_hlc_int_enable(struct octeon_i2c *i2c)  in octeon_i2c_hlc_int_enable()  argument
115 	octeon_i2c_write_int(i2c, TWSI_INT_ST_EN);  in octeon_i2c_hlc_int_enable()
139 	struct octeon_i2c *i2c;  in octeon_i2c_probe()  local
158 	i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);  in octeon_i2c_probe()
159 	if (!i2c) {  in octeon_i2c_probe()
163 	i2c->dev = &pdev->dev;  in octeon_i2c_probe()
165 	i2c->roff.sw_twsi = 0x00;  in octeon_i2c_probe()
166 	i2c->roff.twsi_int = 0x10;  in octeon_i2c_probe()
167 	i2c->roff.sw_twsi_ext = 0x18;  in octeon_i2c_probe()
169 	i2c->twsi_base = devm_platform_ioremap_resource(pdev, 0);  in octeon_i2c_probe()
170 	if (IS_ERR(i2c->twsi_base)) {  in octeon_i2c_probe()
171 		result = PTR_ERR(i2c->twsi_base);  in octeon_i2c_probe()
180 	if (of_property_read_u32(node, "clock-frequency", &i2c->twsi_freq) &&  in octeon_i2c_probe()
181 	    of_property_read_u32(node, "clock-rate", &i2c->twsi_freq)) {  in octeon_i2c_probe()
182 		dev_err(i2c->dev,  in octeon_i2c_probe()
183 			"no I2C 'clock-rate' or 'clock-frequency' property\n");  in octeon_i2c_probe()
188 	i2c->sys_freq = octeon_get_io_clock_rate();  in octeon_i2c_probe()
190 	init_waitqueue_head(&i2c->queue);  in octeon_i2c_probe()
192 	i2c->irq = irq;  in octeon_i2c_probe()
195 		i2c->hlc_irq = hlc_irq;  in octeon_i2c_probe()
197 		i2c->int_enable = octeon_i2c_int_enable78;  in octeon_i2c_probe()
198 		i2c->int_disable = octeon_i2c_int_disable78;  in octeon_i2c_probe()
199 		i2c->hlc_int_enable = octeon_i2c_hlc_int_enable78;  in octeon_i2c_probe()
200 		i2c->hlc_int_disable = octeon_i2c_hlc_int_disable78;  in octeon_i2c_probe()
202 		irq_set_status_flags(i2c->irq, IRQ_NOAUTOEN);  in octeon_i2c_probe()
203 		irq_set_status_flags(i2c->hlc_irq, IRQ_NOAUTOEN);  in octeon_i2c_probe()
205 		result = devm_request_irq(&pdev->dev, i2c->hlc_irq,  in octeon_i2c_probe()
207 					  DRV_NAME, i2c);  in octeon_i2c_probe()
209 			dev_err(i2c->dev, "failed to attach interrupt\n");  in octeon_i2c_probe()
213 		i2c->int_enable = octeon_i2c_int_enable;  in octeon_i2c_probe()
214 		i2c->int_disable = octeon_i2c_int_disable;  in octeon_i2c_probe()
215 		i2c->hlc_int_enable = octeon_i2c_hlc_int_enable;  in octeon_i2c_probe()
216 		i2c->hlc_int_disable = octeon_i2c_int_disable;  in octeon_i2c_probe()
219 	result = devm_request_irq(&pdev->dev, i2c->irq,  in octeon_i2c_probe()
220 				  octeon_i2c_isr, 0, DRV_NAME, i2c);  in octeon_i2c_probe()
222 		dev_err(i2c->dev, "failed to attach interrupt\n");  in octeon_i2c_probe()
227 		i2c->broken_irq_check = true;  in octeon_i2c_probe()
229 	result = octeon_i2c_init_lowlevel(i2c);  in octeon_i2c_probe()
231 		dev_err(i2c->dev, "init low level failed\n");  in octeon_i2c_probe()
235 	octeon_i2c_set_clock(i2c);  in octeon_i2c_probe()
237 	i2c->adap = octeon_i2c_ops;  in octeon_i2c_probe()
238 	i2c->adap.timeout = msecs_to_jiffies(2);  in octeon_i2c_probe()
239 	i2c->adap.retries = 5;  in octeon_i2c_probe()
240 	i2c->adap.bus_recovery_info = &octeon_i2c_recovery_info;  in octeon_i2c_probe()
241 	i2c->adap.dev.parent = &pdev->dev;  in octeon_i2c_probe()
242 	i2c->adap.dev.of_node = node;  in octeon_i2c_probe()
243 	i2c_set_adapdata(&i2c->adap, i2c);  in octeon_i2c_probe()
244 	platform_set_drvdata(pdev, i2c);  in octeon_i2c_probe()
246 	result = i2c_add_adapter(&i2c->adap);  in octeon_i2c_probe()
249 	dev_info(i2c->dev, "probed\n");  in octeon_i2c_probe()
258 	struct octeon_i2c *i2c = platform_get_drvdata(pdev);  in octeon_i2c_remove()  local
260 	i2c_del_adapter(&i2c->adap);  in octeon_i2c_remove()
283 MODULE_DESCRIPTION("I2C-Bus adapter for Cavium OCTEON processors");