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"
28 #define PCI_DEVICE_ID_THUNDER_TWSI	0xa012
33 #define TWSI_INT_ENA_W1C		0x1028
34 #define TWSI_INT_ENA_W1S		0x1030
38  * The interrupt will be asserted when there is non-STAT_IDLE state in the
41 static void thunder_i2c_int_enable(struct octeon_i2c *i2c)  in thunder_i2c_int_enable()  argument
44 				i2c->twsi_base + TWSI_INT_ENA_W1S);  in thunder_i2c_int_enable()
50 static void thunder_i2c_int_disable(struct octeon_i2c *i2c)  in thunder_i2c_int_disable()  argument
53 				i2c->twsi_base + TWSI_INT_ENA_W1C);  in thunder_i2c_int_disable()
56 static void thunder_i2c_hlc_int_enable(struct octeon_i2c *i2c)  in thunder_i2c_hlc_int_enable()  argument
59 				i2c->twsi_base + TWSI_INT_ENA_W1S);  in thunder_i2c_hlc_int_enable()
62 static void thunder_i2c_hlc_int_disable(struct octeon_i2c *i2c)  in thunder_i2c_hlc_int_disable()  argument
65 				i2c->twsi_base + TWSI_INT_ENA_W1C);  in thunder_i2c_hlc_int_disable()
85 static void thunder_i2c_clock_enable(struct device *dev, struct octeon_i2c *i2c)  in thunder_i2c_clock_enable()  argument
91 		i2c->clk = clk_get(dev, NULL);  in thunder_i2c_clock_enable()
92 		if (IS_ERR(i2c->clk)) {  in thunder_i2c_clock_enable()
93 			i2c->clk = NULL;  in thunder_i2c_clock_enable()
97 		ret = clk_prepare_enable(i2c->clk);  in thunder_i2c_clock_enable()
100 		i2c->sys_freq = clk_get_rate(i2c->clk);  in thunder_i2c_clock_enable()
103 		if (device_property_read_u32(dev, "sclk", &i2c->sys_freq))  in thunder_i2c_clock_enable()
104 			device_property_read_u32(dev, "ioclk", &i2c->sys_freq);  in thunder_i2c_clock_enable()
108 	if (!i2c->sys_freq)  in thunder_i2c_clock_enable()
109 		i2c->sys_freq = SYS_FREQ_DEFAULT;  in thunder_i2c_clock_enable()
120 static int thunder_i2c_smbus_setup_of(struct octeon_i2c *i2c,  in thunder_i2c_smbus_setup_of()  argument
126 		return -EINVAL;  in thunder_i2c_smbus_setup_of()
128 	i2c->alert_data.irq = irq_of_parse_and_map(node, 0);  in thunder_i2c_smbus_setup_of()
129 	if (!i2c->alert_data.irq)  in thunder_i2c_smbus_setup_of()
130 		return -EINVAL;  in thunder_i2c_smbus_setup_of()
132 	ara = i2c_new_smbus_alert_device(&i2c->adap, &i2c->alert_data);  in thunder_i2c_smbus_setup_of()
136 	i2c->ara = ara;  in thunder_i2c_smbus_setup_of()
138 	return 0;  in thunder_i2c_smbus_setup_of()
141 static int thunder_i2c_smbus_setup(struct octeon_i2c *i2c,  in thunder_i2c_smbus_setup()  argument
146 		return -EOPNOTSUPP;  in thunder_i2c_smbus_setup()
148 	return thunder_i2c_smbus_setup_of(i2c, node);  in thunder_i2c_smbus_setup()
151 static void thunder_i2c_smbus_remove(struct octeon_i2c *i2c)  in thunder_i2c_smbus_remove()  argument
153 	i2c_unregister_device(i2c->ara);  in thunder_i2c_smbus_remove()
159 	struct device *dev = &pdev->dev;  in thunder_i2c_probe_pci()
160 	struct octeon_i2c *i2c;  in thunder_i2c_probe_pci()  local
163 	i2c = devm_kzalloc(dev, sizeof(*i2c), GFP_KERNEL);  in thunder_i2c_probe_pci()
164 	if (!i2c)  in thunder_i2c_probe_pci()
165 		return -ENOMEM;  in thunder_i2c_probe_pci()
167 	i2c->roff.sw_twsi = 0x1000;  in thunder_i2c_probe_pci()
168 	i2c->roff.twsi_int = 0x1010;  in thunder_i2c_probe_pci()
169 	i2c->roff.sw_twsi_ext = 0x1018;  in thunder_i2c_probe_pci()
170 	i2c->roff.mode = 0x1038;  in thunder_i2c_probe_pci()
172 	i2c->dev = dev;  in thunder_i2c_probe_pci()
173 	pci_set_drvdata(pdev, i2c);  in thunder_i2c_probe_pci()
182 	i2c->twsi_base = pcim_iomap(pdev, 0, pci_resource_len(pdev, 0));  in thunder_i2c_probe_pci()
183 	if (!i2c->twsi_base)  in thunder_i2c_probe_pci()
184 		return -EINVAL;  in thunder_i2c_probe_pci()
186 	thunder_i2c_clock_enable(dev, i2c);  in thunder_i2c_probe_pci()
187 	ret = device_property_read_u32(dev, "clock-frequency", &i2c->twsi_freq);  in thunder_i2c_probe_pci()
189 		i2c->twsi_freq = I2C_MAX_STANDARD_MODE_FREQ;  in thunder_i2c_probe_pci()
191 	init_waitqueue_head(&i2c->queue);  in thunder_i2c_probe_pci()
193 	i2c->int_enable = thunder_i2c_int_enable;  in thunder_i2c_probe_pci()
194 	i2c->int_disable = thunder_i2c_int_disable;  in thunder_i2c_probe_pci()
195 	i2c->hlc_int_enable = thunder_i2c_hlc_int_enable;  in thunder_i2c_probe_pci()
196 	i2c->hlc_int_disable = thunder_i2c_hlc_int_disable;  in thunder_i2c_probe_pci()
199 	if (ret < 0)  in thunder_i2c_probe_pci()
202 	ret = devm_request_irq(dev, pci_irq_vector(pdev, 0), octeon_i2c_isr, 0,  in thunder_i2c_probe_pci()
203 			       DRV_NAME, i2c);  in thunder_i2c_probe_pci()
207 	ret = octeon_i2c_init_lowlevel(i2c);  in thunder_i2c_probe_pci()
215 	if (octeon_i2c_is_otx2(pdev) && IS_LS_FREQ(i2c->twsi_freq))  in thunder_i2c_probe_pci()
216 		i2c->sys_freq = OTX2_REF_FREQ_DEFAULT;  in thunder_i2c_probe_pci()
217 	octeon_i2c_set_clock(i2c);  in thunder_i2c_probe_pci()
219 	i2c->adap = thunderx_i2c_ops;  in thunder_i2c_probe_pci()
220 	i2c->adap.retries = 5;  in thunder_i2c_probe_pci()
221 	i2c->adap.class = I2C_CLASS_HWMON;  in thunder_i2c_probe_pci()
222 	i2c->adap.bus_recovery_info = &octeon_i2c_recovery_info;  in thunder_i2c_probe_pci()
223 	i2c->adap.dev.parent = dev;  in thunder_i2c_probe_pci()
224 	i2c->adap.dev.of_node = pdev->dev.of_node;  in thunder_i2c_probe_pci()
225 	i2c->adap.dev.fwnode = dev->fwnode;  in thunder_i2c_probe_pci()
226 	snprintf(i2c->adap.name, sizeof(i2c->adap.name),  in thunder_i2c_probe_pci()
227 		 "Cavium ThunderX i2c adapter at %s", dev_name(dev));  in thunder_i2c_probe_pci()
228 	i2c_set_adapdata(&i2c->adap, i2c);  in thunder_i2c_probe_pci()
230 	ret = i2c_add_adapter(&i2c->adap);  in thunder_i2c_probe_pci()
234 	dev_info(i2c->dev, "Probed. Set system clock to %u\n", i2c->sys_freq);  in thunder_i2c_probe_pci()
236 	ret = thunder_i2c_smbus_setup(i2c, pdev->dev.of_node);  in thunder_i2c_probe_pci()
240 	return 0;  in thunder_i2c_probe_pci()
243 	thunder_i2c_clock_disable(dev, i2c->clk);  in thunder_i2c_probe_pci()
249 	struct octeon_i2c *i2c = pci_get_drvdata(pdev);  in thunder_i2c_remove_pci()  local
251 	thunder_i2c_smbus_remove(i2c);  in thunder_i2c_remove_pci()
252 	thunder_i2c_clock_disable(&pdev->dev, i2c->clk);  in thunder_i2c_remove_pci()
253 	i2c_del_adapter(&i2c->adap);  in thunder_i2c_remove_pci()
258 	{ 0, }
274 MODULE_DESCRIPTION("I2C-Bus adapter for Cavium ThunderX SOC");