Lines Matching full:i2c
2 * i2c-ocores.c: I2C bus driver for OpenCores I2C controller
3 * (http://www.opencores.org/projects.cgi/web/i2c/overview).
16 * - compatible : "opencores,i2c-ocores"
25 * compatible = "opencores,i2c-ocores";
32 * -- Devices connected on this I2C bus get
52 #include <linux/i2c.h>
55 #include <linux/i2c-ocores.h>
102 static inline void oc_setreg(struct ocores_i2c *i2c, int reg, u8 value) in oc_setreg() argument
104 iowrite8(value, i2c->base + reg * i2c->regstep); in oc_setreg()
107 static inline u8 oc_getreg(struct ocores_i2c *i2c, int reg) in oc_getreg() argument
109 return ioread8(i2c->base + reg * i2c->regstep); in oc_getreg()
112 static void ocores_process(struct ocores_i2c *i2c) in ocores_process() argument
114 struct i2c_msg *msg = i2c->msg; in ocores_process()
115 u8 stat = oc_getreg(i2c, OCI2C_STATUS); in ocores_process()
117 if ((i2c->state == STATE_DONE) || (i2c->state == STATE_ERROR)) { in ocores_process()
119 oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_IACK); in ocores_process()
120 wake_up(&i2c->wait); in ocores_process()
126 i2c->state = STATE_ERROR; in ocores_process()
127 oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_STOP); in ocores_process()
131 if ((i2c->state == STATE_START) || (i2c->state == STATE_WRITE)) { in ocores_process()
132 i2c->state = in ocores_process()
136 i2c->state = STATE_ERROR; in ocores_process()
137 oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_STOP); in ocores_process()
141 msg->buf[i2c->pos++] = oc_getreg(i2c, OCI2C_DATA); in ocores_process()
144 if (i2c->pos == msg->len) { in ocores_process()
145 i2c->nmsgs--; in ocores_process()
146 i2c->msg++; in ocores_process()
147 i2c->pos = 0; in ocores_process()
148 msg = i2c->msg; in ocores_process()
150 if (i2c->nmsgs) { /* end? */ in ocores_process()
158 i2c->state = STATE_START; in ocores_process()
160 oc_setreg(i2c, OCI2C_DATA, addr); in ocores_process()
161 oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_START); in ocores_process()
164 i2c->state = (msg->flags & I2C_M_RD) in ocores_process()
167 i2c->state = STATE_DONE; in ocores_process()
168 oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_STOP); in ocores_process()
173 if (i2c->state == STATE_READ) { in ocores_process()
174 oc_setreg(i2c, OCI2C_CMD, i2c->pos == (msg->len-1) ? in ocores_process()
177 oc_setreg(i2c, OCI2C_DATA, msg->buf[i2c->pos++]); in ocores_process()
178 oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_WRITE); in ocores_process()
184 struct ocores_i2c *i2c = dev_id; in ocores_isr() local
186 ocores_process(i2c); in ocores_isr()
193 struct ocores_i2c *i2c = i2c_get_adapdata(adap); in ocores_xfer() local
195 i2c->msg = msgs; in ocores_xfer()
196 i2c->pos = 0; in ocores_xfer()
197 i2c->nmsgs = num; in ocores_xfer()
198 i2c->state = STATE_START; in ocores_xfer()
200 oc_setreg(i2c, OCI2C_DATA, in ocores_xfer()
201 (i2c->msg->addr << 1) | in ocores_xfer()
202 ((i2c->msg->flags & I2C_M_RD) ? 1:0)); in ocores_xfer()
204 oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_START); in ocores_xfer()
206 if (wait_event_timeout(i2c->wait, (i2c->state == STATE_ERROR) || in ocores_xfer()
207 (i2c->state == STATE_DONE), HZ)) in ocores_xfer()
208 return (i2c->state == STATE_DONE) ? num : -EIO; in ocores_xfer()
213 static void ocores_init(struct ocores_i2c *i2c) in ocores_init() argument
216 u8 ctrl = oc_getreg(i2c, OCI2C_CONTROL); in ocores_init()
219 oc_setreg(i2c, OCI2C_CONTROL, ctrl & ~(OCI2C_CTRL_EN|OCI2C_CTRL_IEN)); in ocores_init()
221 prescale = (i2c->clock_khz / (5*100)) - 1; in ocores_init()
222 oc_setreg(i2c, OCI2C_PRELOW, prescale & 0xff); in ocores_init()
223 oc_setreg(i2c, OCI2C_PREHIGH, prescale >> 8); in ocores_init()
226 oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_IACK); in ocores_init()
227 oc_setreg(i2c, OCI2C_CONTROL, ctrl | OCI2C_CTRL_IEN | OCI2C_CTRL_EN); in ocores_init()
243 .name = "i2c-ocores",
250 struct ocores_i2c* i2c) in ocores_i2c_of_probe() argument
259 i2c->regstep = be32_to_cpup(val); in ocores_i2c_of_probe()
267 i2c->clock_khz = be32_to_cpup(val) / 1000; in ocores_i2c_of_probe()
272 #define ocores_i2c_of_probe(pdev,i2c) -ENODEV argument
277 struct ocores_i2c *i2c; in ocores_i2c_probe() local
291 i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL); in ocores_i2c_probe()
292 if (!i2c) in ocores_i2c_probe()
301 i2c->base = devm_ioremap_nocache(&pdev->dev, res->start, in ocores_i2c_probe()
303 if (!i2c->base) { in ocores_i2c_probe()
310 i2c->regstep = pdata->regstep; in ocores_i2c_probe()
311 i2c->clock_khz = pdata->clock_khz; in ocores_i2c_probe()
313 ret = ocores_i2c_of_probe(pdev, i2c); in ocores_i2c_probe()
318 ocores_init(i2c); in ocores_i2c_probe()
320 init_waitqueue_head(&i2c->wait); in ocores_i2c_probe()
322 pdev->name, i2c); in ocores_i2c_probe()
329 platform_set_drvdata(pdev, i2c); in ocores_i2c_probe()
330 i2c->adap = ocores_adapter; in ocores_i2c_probe()
331 i2c_set_adapdata(&i2c->adap, i2c); in ocores_i2c_probe()
332 i2c->adap.dev.parent = &pdev->dev; in ocores_i2c_probe()
333 i2c->adap.dev.of_node = pdev->dev.of_node; in ocores_i2c_probe()
335 /* add i2c adapter to i2c tree */ in ocores_i2c_probe()
336 ret = i2c_add_adapter(&i2c->adap); in ocores_i2c_probe()
345 i2c_new_device(&i2c->adap, pdata->devices + i); in ocores_i2c_probe()
353 struct ocores_i2c *i2c = platform_get_drvdata(pdev); in ocores_i2c_remove() local
355 /* disable i2c logic */ in ocores_i2c_remove()
356 oc_setreg(i2c, OCI2C_CONTROL, oc_getreg(i2c, OCI2C_CONTROL) in ocores_i2c_remove()
360 i2c_del_adapter(&i2c->adap); in ocores_i2c_remove()
369 struct ocores_i2c *i2c = platform_get_drvdata(pdev); in ocores_i2c_suspend() local
370 u8 ctrl = oc_getreg(i2c, OCI2C_CONTROL); in ocores_i2c_suspend()
373 oc_setreg(i2c, OCI2C_CONTROL, ctrl & ~(OCI2C_CTRL_EN|OCI2C_CTRL_IEN)); in ocores_i2c_suspend()
380 struct ocores_i2c *i2c = platform_get_drvdata(pdev); in ocores_i2c_resume() local
382 ocores_init(i2c); in ocores_i2c_resume()
392 { .compatible = "opencores,i2c-ocores", },
404 .name = "ocores-i2c",
412 MODULE_DESCRIPTION("OpenCores I2C bus driver");
414 MODULE_ALIAS("platform:ocores-i2c");