Lines Matching refs:i2c
42 void (*setreg)(struct ocores_i2c *i2c, int reg, u8 value);
43 u8 (*getreg)(struct ocores_i2c *i2c, int reg);
80 static void oc_setreg_8(struct ocores_i2c *i2c, int reg, u8 value) in oc_setreg_8() argument
82 iowrite8(value, i2c->base + (reg << i2c->reg_shift)); in oc_setreg_8()
85 static void oc_setreg_16(struct ocores_i2c *i2c, int reg, u8 value) in oc_setreg_16() argument
87 iowrite16(value, i2c->base + (reg << i2c->reg_shift)); in oc_setreg_16()
90 static void oc_setreg_32(struct ocores_i2c *i2c, int reg, u8 value) in oc_setreg_32() argument
92 iowrite32(value, i2c->base + (reg << i2c->reg_shift)); in oc_setreg_32()
95 static inline u8 oc_getreg_8(struct ocores_i2c *i2c, int reg) in oc_getreg_8() argument
97 return ioread8(i2c->base + (reg << i2c->reg_shift)); in oc_getreg_8()
100 static inline u8 oc_getreg_16(struct ocores_i2c *i2c, int reg) in oc_getreg_16() argument
102 return ioread16(i2c->base + (reg << i2c->reg_shift)); in oc_getreg_16()
105 static inline u8 oc_getreg_32(struct ocores_i2c *i2c, int reg) in oc_getreg_32() argument
107 return ioread32(i2c->base + (reg << i2c->reg_shift)); in oc_getreg_32()
110 static inline void oc_setreg(struct ocores_i2c *i2c, int reg, u8 value) in oc_setreg() argument
112 i2c->setreg(i2c, reg, value); in oc_setreg()
115 static inline u8 oc_getreg(struct ocores_i2c *i2c, int reg) in oc_getreg() argument
117 return i2c->getreg(i2c, reg); in oc_getreg()
120 static void ocores_process(struct ocores_i2c *i2c) in ocores_process() argument
122 struct i2c_msg *msg = i2c->msg; in ocores_process()
123 u8 stat = oc_getreg(i2c, OCI2C_STATUS); in ocores_process()
125 if ((i2c->state == STATE_DONE) || (i2c->state == STATE_ERROR)) { in ocores_process()
127 oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_IACK); in ocores_process()
128 wake_up(&i2c->wait); in ocores_process()
134 i2c->state = STATE_ERROR; in ocores_process()
135 oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_STOP); in ocores_process()
139 if ((i2c->state == STATE_START) || (i2c->state == STATE_WRITE)) { in ocores_process()
140 i2c->state = in ocores_process()
144 i2c->state = STATE_ERROR; in ocores_process()
145 oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_STOP); in ocores_process()
149 msg->buf[i2c->pos++] = oc_getreg(i2c, OCI2C_DATA); in ocores_process()
152 if (i2c->pos == msg->len) { in ocores_process()
153 i2c->nmsgs--; in ocores_process()
154 i2c->msg++; in ocores_process()
155 i2c->pos = 0; in ocores_process()
156 msg = i2c->msg; in ocores_process()
158 if (i2c->nmsgs) { /* end? */ in ocores_process()
166 i2c->state = STATE_START; in ocores_process()
168 oc_setreg(i2c, OCI2C_DATA, addr); in ocores_process()
169 oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_START); in ocores_process()
172 i2c->state = (msg->flags & I2C_M_RD) in ocores_process()
175 i2c->state = STATE_DONE; in ocores_process()
176 oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_STOP); in ocores_process()
181 if (i2c->state == STATE_READ) { in ocores_process()
182 oc_setreg(i2c, OCI2C_CMD, i2c->pos == (msg->len-1) ? in ocores_process()
185 oc_setreg(i2c, OCI2C_DATA, msg->buf[i2c->pos++]); in ocores_process()
186 oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_WRITE); in ocores_process()
192 struct ocores_i2c *i2c = dev_id; in ocores_isr() local
194 ocores_process(i2c); in ocores_isr()
201 struct ocores_i2c *i2c = i2c_get_adapdata(adap); in ocores_xfer() local
203 i2c->msg = msgs; in ocores_xfer()
204 i2c->pos = 0; in ocores_xfer()
205 i2c->nmsgs = num; in ocores_xfer()
206 i2c->state = STATE_START; in ocores_xfer()
208 oc_setreg(i2c, OCI2C_DATA, in ocores_xfer()
209 (i2c->msg->addr << 1) | in ocores_xfer()
210 ((i2c->msg->flags & I2C_M_RD) ? 1:0)); in ocores_xfer()
212 oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_START); in ocores_xfer()
214 if (wait_event_timeout(i2c->wait, (i2c->state == STATE_ERROR) || in ocores_xfer()
215 (i2c->state == STATE_DONE), HZ)) in ocores_xfer()
216 return (i2c->state == STATE_DONE) ? num : -EIO; in ocores_xfer()
221 static int ocores_init(struct device *dev, struct ocores_i2c *i2c) in ocores_init() argument
225 u8 ctrl = oc_getreg(i2c, OCI2C_CONTROL); in ocores_init()
228 oc_setreg(i2c, OCI2C_CONTROL, ctrl & ~(OCI2C_CTRL_EN|OCI2C_CTRL_IEN)); in ocores_init()
230 prescale = (i2c->ip_clock_khz / (5 * i2c->bus_clock_khz)) - 1; in ocores_init()
233 diff = i2c->ip_clock_khz / (5 * (prescale + 1)) - i2c->bus_clock_khz; in ocores_init()
234 if (abs(diff) > i2c->bus_clock_khz / 10) { in ocores_init()
237 i2c->ip_clock_khz, i2c->bus_clock_khz); in ocores_init()
241 oc_setreg(i2c, OCI2C_PRELOW, prescale & 0xff); in ocores_init()
242 oc_setreg(i2c, OCI2C_PREHIGH, prescale >> 8); in ocores_init()
245 oc_setreg(i2c, OCI2C_CMD, OCI2C_CMD_IACK); in ocores_init()
246 oc_setreg(i2c, OCI2C_CONTROL, ctrl | OCI2C_CTRL_IEN | OCI2C_CTRL_EN); in ocores_init()
286 static u8 oc_getreg_grlib(struct ocores_i2c *i2c, int reg) in oc_getreg_grlib() argument
292 rd = ioread32be(i2c->base + (rreg << i2c->reg_shift)); in oc_getreg_grlib()
299 static void oc_setreg_grlib(struct ocores_i2c *i2c, int reg, u8 value) in oc_setreg_grlib() argument
306 curr = ioread32be(i2c->base + (rreg << i2c->reg_shift)); in oc_setreg_grlib()
314 iowrite32be(wr, i2c->base + (rreg << i2c->reg_shift)); in oc_setreg_grlib()
318 struct ocores_i2c *i2c) in ocores_i2c_of_probe() argument
326 if (of_property_read_u32(np, "reg-shift", &i2c->reg_shift)) { in ocores_i2c_of_probe()
334 i2c->reg_shift = ilog2(val); in ocores_i2c_of_probe()
342 i2c->bus_clock_khz = 100; in ocores_i2c_of_probe()
344 i2c->clk = devm_clk_get(&pdev->dev, NULL); in ocores_i2c_of_probe()
346 if (!IS_ERR(i2c->clk)) { in ocores_i2c_of_probe()
347 int ret = clk_prepare_enable(i2c->clk); in ocores_i2c_of_probe()
354 i2c->ip_clock_khz = clk_get_rate(i2c->clk) / 1000; in ocores_i2c_of_probe()
356 i2c->bus_clock_khz = clock_frequency / 1000; in ocores_i2c_of_probe()
359 if (i2c->ip_clock_khz == 0) { in ocores_i2c_of_probe()
367 i2c->ip_clock_khz = clock_frequency / 1000; in ocores_i2c_of_probe()
371 i2c->ip_clock_khz = val / 1000; in ocores_i2c_of_probe()
373 i2c->bus_clock_khz = clock_frequency / 1000; in ocores_i2c_of_probe()
378 &i2c->reg_io_width); in ocores_i2c_of_probe()
383 i2c->setreg = oc_setreg_grlib; in ocores_i2c_of_probe()
384 i2c->getreg = oc_getreg_grlib; in ocores_i2c_of_probe()
390 #define ocores_i2c_of_probe(pdev,i2c) -ENODEV argument
395 struct ocores_i2c *i2c; in ocores_i2c_probe() local
406 i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL); in ocores_i2c_probe()
407 if (!i2c) in ocores_i2c_probe()
411 i2c->base = devm_ioremap_resource(&pdev->dev, res); in ocores_i2c_probe()
412 if (IS_ERR(i2c->base)) in ocores_i2c_probe()
413 return PTR_ERR(i2c->base); in ocores_i2c_probe()
417 i2c->reg_shift = pdata->reg_shift; in ocores_i2c_probe()
418 i2c->reg_io_width = pdata->reg_io_width; in ocores_i2c_probe()
419 i2c->ip_clock_khz = pdata->clock_khz; in ocores_i2c_probe()
420 i2c->bus_clock_khz = 100; in ocores_i2c_probe()
422 ret = ocores_i2c_of_probe(pdev, i2c); in ocores_i2c_probe()
427 if (i2c->reg_io_width == 0) in ocores_i2c_probe()
428 i2c->reg_io_width = 1; /* Set to default value */ in ocores_i2c_probe()
430 if (!i2c->setreg || !i2c->getreg) { in ocores_i2c_probe()
431 switch (i2c->reg_io_width) { in ocores_i2c_probe()
433 i2c->setreg = oc_setreg_8; in ocores_i2c_probe()
434 i2c->getreg = oc_getreg_8; in ocores_i2c_probe()
438 i2c->setreg = oc_setreg_16; in ocores_i2c_probe()
439 i2c->getreg = oc_getreg_16; in ocores_i2c_probe()
443 i2c->setreg = oc_setreg_32; in ocores_i2c_probe()
444 i2c->getreg = oc_getreg_32; in ocores_i2c_probe()
449 i2c->reg_io_width); in ocores_i2c_probe()
454 ret = ocores_init(&pdev->dev, i2c); in ocores_i2c_probe()
458 init_waitqueue_head(&i2c->wait); in ocores_i2c_probe()
460 pdev->name, i2c); in ocores_i2c_probe()
467 platform_set_drvdata(pdev, i2c); in ocores_i2c_probe()
468 i2c->adap = ocores_adapter; in ocores_i2c_probe()
469 i2c_set_adapdata(&i2c->adap, i2c); in ocores_i2c_probe()
470 i2c->adap.dev.parent = &pdev->dev; in ocores_i2c_probe()
471 i2c->adap.dev.of_node = pdev->dev.of_node; in ocores_i2c_probe()
474 ret = i2c_add_adapter(&i2c->adap); in ocores_i2c_probe()
483 i2c_new_device(&i2c->adap, pdata->devices + i); in ocores_i2c_probe()
491 struct ocores_i2c *i2c = platform_get_drvdata(pdev); in ocores_i2c_remove() local
494 oc_setreg(i2c, OCI2C_CONTROL, oc_getreg(i2c, OCI2C_CONTROL) in ocores_i2c_remove()
498 i2c_del_adapter(&i2c->adap); in ocores_i2c_remove()
500 if (!IS_ERR(i2c->clk)) in ocores_i2c_remove()
501 clk_disable_unprepare(i2c->clk); in ocores_i2c_remove()
509 struct ocores_i2c *i2c = dev_get_drvdata(dev); in ocores_i2c_suspend() local
510 u8 ctrl = oc_getreg(i2c, OCI2C_CONTROL); in ocores_i2c_suspend()
513 oc_setreg(i2c, OCI2C_CONTROL, ctrl & ~(OCI2C_CTRL_EN|OCI2C_CTRL_IEN)); in ocores_i2c_suspend()
515 if (!IS_ERR(i2c->clk)) in ocores_i2c_suspend()
516 clk_disable_unprepare(i2c->clk); in ocores_i2c_suspend()
522 struct ocores_i2c *i2c = dev_get_drvdata(dev); in ocores_i2c_resume() local
524 if (!IS_ERR(i2c->clk)) { in ocores_i2c_resume()
526 int ret = clk_prepare_enable(i2c->clk); in ocores_i2c_resume()
533 rate = clk_get_rate(i2c->clk) / 1000; in ocores_i2c_resume()
535 i2c->ip_clock_khz = rate; in ocores_i2c_resume()
537 return ocores_init(dev, i2c); in ocores_i2c_resume()