i2c/busses/i2c-thunderx-pcidrv.c

2  * Cavium ThunderX i2c driver.
16 #include <linux/i2c.h>
17 #include <linux/i2c-smbus.h>
24 #include "i2c-octeon-core.h"
26 #define DRV_NAME "i2c-thunderx"
40 static void thunder_i2c_int_enable(struct octeon_i2c *i2c)
43 				i2c->twsi_base + TWSI_INT_ENA_W1S);
49 static void thunder_i2c_int_disable(struct octeon_i2c *i2c)
52 				i2c->twsi_base + TWSI_INT_ENA_W1C);
55 static void thunder_i2c_hlc_int_enable(struct octeon_i2c *i2c)
58 				i2c->twsi_base + TWSI_INT_ENA_W1S);
61 static void thunder_i2c_hlc_int_disable(struct octeon_i2c *i2c)
64 				i2c->twsi_base + TWSI_INT_ENA_W1C);
84 static void thunder_i2c_clock_enable(struct device *dev, struct octeon_i2c *i2c)
90 		i2c->clk = clk_get(dev, NULL);
91 		if (IS_ERR(i2c->clk)) {
92 			i2c->clk = NULL;
96 		ret = clk_prepare_enable(i2c->clk);
99 		i2c->sys_freq = clk_get_rate(i2c->clk);
102 		device_property_read_u32(dev, "sclk", &i2c->sys_freq);
106 	if (!i2c->sys_freq)
107 		i2c->sys_freq = SYS_FREQ_DEFAULT;
118 static int thunder_i2c_smbus_setup_of(struct octeon_i2c *i2c,
126 	i2c->alert_data.irq = irq_of_parse_and_map(node, 0);
127 	if (!i2c->alert_data.irq)
130 	ara = i2c_new_smbus_alert_device(&i2c->adap, &i2c->alert_data);
134 	i2c->ara = ara;
139 static int thunder_i2c_smbus_setup(struct octeon_i2c *i2c,
146 	return thunder_i2c_smbus_setup_of(i2c, node);
149 static void thunder_i2c_smbus_remove(struct octeon_i2c *i2c)
151 	i2c_unregister_device(i2c->ara);
158 	struct octeon_i2c *i2c;
161 	i2c = devm_kzalloc(dev, sizeof(*i2c), GFP_KERNEL);
162 	if (!i2c)
165 	i2c->roff.sw_twsi = 0x1000;
166 	i2c->roff.twsi_int = 0x1010;
167 	i2c->roff.sw_twsi_ext = 0x1018;
169 	i2c->dev = dev;
170 	pci_set_drvdata(pdev, i2c);
179 	i2c->twsi_base = pcim_iomap(pdev, 0, pci_resource_len(pdev, 0));
180 	if (!i2c->twsi_base)
183 	thunder_i2c_clock_enable(dev, i2c);
184 	ret = device_property_read_u32(dev, "clock-frequency", &i2c->twsi_freq);
186 		i2c->twsi_freq = I2C_MAX_STANDARD_MODE_FREQ;
188 	init_waitqueue_head(&i2c->queue);
190 	i2c->int_enable = thunder_i2c_int_enable;
191 	i2c->int_disable = thunder_i2c_int_disable;
192 	i2c->hlc_int_enable = thunder_i2c_hlc_int_enable;
193 	i2c->hlc_int_disable = thunder_i2c_hlc_int_disable;
200 			       DRV_NAME, i2c);
204 	ret = octeon_i2c_init_lowlevel(i2c);
208 	octeon_i2c_set_clock(i2c);
210 	i2c->adap = thunderx_i2c_ops;
211 	i2c->adap.retries = 5;
212 	i2c->adap.class = I2C_CLASS_HWMON;
213 	i2c->adap.bus_recovery_info = &octeon_i2c_recovery_info;
214 	i2c->adap.dev.parent = dev;
215 	i2c->adap.dev.of_node = pdev->dev.of_node;
216 	i2c->adap.dev.fwnode = dev->fwnode;
217 	snprintf(i2c->adap.name, sizeof(i2c->adap.name),
218 		 "Cavium ThunderX i2c adapter at %s", dev_name(dev));
219 	i2c_set_adapdata(&i2c->adap, i2c);
221 	ret = i2c_add_adapter(&i2c->adap);
225 	dev_info(i2c->dev, "Probed. Set system clock to %u\n", i2c->sys_freq);
227 	ret = thunder_i2c_smbus_setup(i2c, pdev->dev.of_node);
234 	thunder_i2c_clock_disable(dev, i2c->clk);
240 	struct octeon_i2c *i2c = pci_get_drvdata(pdev);
242 	thunder_i2c_smbus_remove(i2c);
243 	thunder_i2c_clock_disable(&pdev->dev, i2c->clk);
244 	i2c_del_adapter(&i2c->adap);