Lines Matching refs:i2c
101 static void meson_i2c_set_mask(struct meson_i2c *i2c, int reg, u32 mask, in meson_i2c_set_mask() argument
106 data = readl(i2c->regs + reg); in meson_i2c_set_mask()
109 writel(data, i2c->regs + reg); in meson_i2c_set_mask()
112 static void meson_i2c_reset_tokens(struct meson_i2c *i2c) in meson_i2c_reset_tokens() argument
114 i2c->tokens[0] = 0; in meson_i2c_reset_tokens()
115 i2c->tokens[1] = 0; in meson_i2c_reset_tokens()
116 i2c->num_tokens = 0; in meson_i2c_reset_tokens()
119 static void meson_i2c_add_token(struct meson_i2c *i2c, int token) in meson_i2c_add_token() argument
121 if (i2c->num_tokens < 8) in meson_i2c_add_token()
122 i2c->tokens[0] |= (token & 0xf) << (i2c->num_tokens * 4); in meson_i2c_add_token()
124 i2c->tokens[1] |= (token & 0xf) << ((i2c->num_tokens % 8) * 4); in meson_i2c_add_token()
126 i2c->num_tokens++; in meson_i2c_add_token()
129 static void meson_i2c_write_tokens(struct meson_i2c *i2c) in meson_i2c_write_tokens() argument
131 writel(i2c->tokens[0], i2c->regs + REG_TOK_LIST0); in meson_i2c_write_tokens()
132 writel(i2c->tokens[1], i2c->regs + REG_TOK_LIST1); in meson_i2c_write_tokens()
135 static void meson_i2c_set_clk_div(struct meson_i2c *i2c) in meson_i2c_set_clk_div() argument
137 unsigned long clk_rate = clk_get_rate(i2c->clk); in meson_i2c_set_clk_div()
140 div = DIV_ROUND_UP(clk_rate, i2c->frequency * 4); in meson_i2c_set_clk_div()
141 meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_CLKDIV_MASK, in meson_i2c_set_clk_div()
144 dev_dbg(i2c->dev, "%s: clk %lu, freq %u, div %u\n", __func__, in meson_i2c_set_clk_div()
145 clk_rate, i2c->frequency, div); in meson_i2c_set_clk_div()
148 static void meson_i2c_get_data(struct meson_i2c *i2c, char *buf, int len) in meson_i2c_get_data() argument
153 rdata0 = readl(i2c->regs + REG_TOK_RDATA0); in meson_i2c_get_data()
154 rdata1 = readl(i2c->regs + REG_TOK_RDATA1); in meson_i2c_get_data()
156 dev_dbg(i2c->dev, "%s: data %08x %08x len %d\n", __func__, in meson_i2c_get_data()
166 static void meson_i2c_put_data(struct meson_i2c *i2c, char *buf, int len) in meson_i2c_put_data() argument
177 writel(wdata0, i2c->regs + REG_TOK_WDATA0); in meson_i2c_put_data()
178 writel(wdata1, i2c->regs + REG_TOK_WDATA1); in meson_i2c_put_data()
180 dev_dbg(i2c->dev, "%s: data %08x %08x len %d\n", __func__, in meson_i2c_put_data()
184 static void meson_i2c_prepare_xfer(struct meson_i2c *i2c) in meson_i2c_prepare_xfer() argument
186 bool write = !(i2c->msg->flags & I2C_M_RD); in meson_i2c_prepare_xfer()
189 i2c->count = min_t(int, i2c->msg->len - i2c->pos, 8); in meson_i2c_prepare_xfer()
191 for (i = 0; i < i2c->count - 1; i++) in meson_i2c_prepare_xfer()
192 meson_i2c_add_token(i2c, TOKEN_DATA); in meson_i2c_prepare_xfer()
194 if (i2c->count) { in meson_i2c_prepare_xfer()
195 if (write || i2c->pos + i2c->count < i2c->msg->len) in meson_i2c_prepare_xfer()
196 meson_i2c_add_token(i2c, TOKEN_DATA); in meson_i2c_prepare_xfer()
198 meson_i2c_add_token(i2c, TOKEN_DATA_LAST); in meson_i2c_prepare_xfer()
202 meson_i2c_put_data(i2c, i2c->msg->buf + i2c->pos, i2c->count); in meson_i2c_prepare_xfer()
205 static void meson_i2c_stop(struct meson_i2c *i2c) in meson_i2c_stop() argument
207 dev_dbg(i2c->dev, "%s: last %d\n", __func__, i2c->last); in meson_i2c_stop()
209 if (i2c->last) { in meson_i2c_stop()
210 i2c->state = STATE_STOP; in meson_i2c_stop()
211 meson_i2c_add_token(i2c, TOKEN_STOP); in meson_i2c_stop()
213 i2c->state = STATE_IDLE; in meson_i2c_stop()
214 complete(&i2c->done); in meson_i2c_stop()
220 struct meson_i2c *i2c = dev_id; in meson_i2c_irq() local
223 spin_lock(&i2c->lock); in meson_i2c_irq()
225 meson_i2c_reset_tokens(i2c); in meson_i2c_irq()
226 ctrl = readl(i2c->regs + REG_CTRL); in meson_i2c_irq()
228 dev_dbg(i2c->dev, "irq: state %d, pos %d, count %d, ctrl %08x\n", in meson_i2c_irq()
229 i2c->state, i2c->pos, i2c->count, ctrl); in meson_i2c_irq()
231 if (ctrl & REG_CTRL_ERROR && i2c->state != STATE_IDLE) { in meson_i2c_irq()
238 dev_dbg(i2c->dev, "error bit set\n"); in meson_i2c_irq()
239 i2c->error = -ENXIO; in meson_i2c_irq()
240 i2c->state = STATE_IDLE; in meson_i2c_irq()
241 complete(&i2c->done); in meson_i2c_irq()
245 switch (i2c->state) { in meson_i2c_irq()
247 if (i2c->count > 0) { in meson_i2c_irq()
248 meson_i2c_get_data(i2c, i2c->msg->buf + i2c->pos, in meson_i2c_irq()
249 i2c->count); in meson_i2c_irq()
250 i2c->pos += i2c->count; in meson_i2c_irq()
253 if (i2c->pos >= i2c->msg->len) { in meson_i2c_irq()
254 meson_i2c_stop(i2c); in meson_i2c_irq()
258 meson_i2c_prepare_xfer(i2c); in meson_i2c_irq()
261 i2c->pos += i2c->count; in meson_i2c_irq()
263 if (i2c->pos >= i2c->msg->len) { in meson_i2c_irq()
264 meson_i2c_stop(i2c); in meson_i2c_irq()
268 meson_i2c_prepare_xfer(i2c); in meson_i2c_irq()
271 i2c->state = STATE_IDLE; in meson_i2c_irq()
272 complete(&i2c->done); in meson_i2c_irq()
279 if (i2c->state != STATE_IDLE) { in meson_i2c_irq()
281 meson_i2c_write_tokens(i2c); in meson_i2c_irq()
282 meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_START, 0); in meson_i2c_irq()
283 meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_START, in meson_i2c_irq()
287 spin_unlock(&i2c->lock); in meson_i2c_irq()
292 static void meson_i2c_do_start(struct meson_i2c *i2c, struct i2c_msg *msg) in meson_i2c_do_start() argument
299 writel(msg->addr << 1, i2c->regs + REG_SLAVE_ADDR); in meson_i2c_do_start()
300 meson_i2c_add_token(i2c, TOKEN_START); in meson_i2c_do_start()
301 meson_i2c_add_token(i2c, token); in meson_i2c_do_start()
304 static int meson_i2c_xfer_msg(struct meson_i2c *i2c, struct i2c_msg *msg, in meson_i2c_xfer_msg() argument
310 i2c->msg = msg; in meson_i2c_xfer_msg()
311 i2c->last = last; in meson_i2c_xfer_msg()
312 i2c->pos = 0; in meson_i2c_xfer_msg()
313 i2c->count = 0; in meson_i2c_xfer_msg()
314 i2c->error = 0; in meson_i2c_xfer_msg()
316 meson_i2c_reset_tokens(i2c); in meson_i2c_xfer_msg()
319 meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_ACK_IGNORE, flags); in meson_i2c_xfer_msg()
322 meson_i2c_do_start(i2c, msg); in meson_i2c_xfer_msg()
324 i2c->state = (msg->flags & I2C_M_RD) ? STATE_READ : STATE_WRITE; in meson_i2c_xfer_msg()
325 meson_i2c_prepare_xfer(i2c); in meson_i2c_xfer_msg()
326 meson_i2c_write_tokens(i2c); in meson_i2c_xfer_msg()
327 reinit_completion(&i2c->done); in meson_i2c_xfer_msg()
330 meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_START, REG_CTRL_START); in meson_i2c_xfer_msg()
333 time_left = wait_for_completion_timeout(&i2c->done, time_left); in meson_i2c_xfer_msg()
340 spin_lock_irqsave(&i2c->lock, flags); in meson_i2c_xfer_msg()
343 meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_START, 0); in meson_i2c_xfer_msg()
346 i2c->state = STATE_IDLE; in meson_i2c_xfer_msg()
350 if (i2c->error) in meson_i2c_xfer_msg()
351 ret = i2c->error; in meson_i2c_xfer_msg()
353 spin_unlock_irqrestore(&i2c->lock, flags); in meson_i2c_xfer_msg()
361 struct meson_i2c *i2c = adap->algo_data; in meson_i2c_xfer() local
364 clk_enable(i2c->clk); in meson_i2c_xfer()
365 meson_i2c_set_clk_div(i2c); in meson_i2c_xfer()
368 ret = meson_i2c_xfer_msg(i2c, msgs + i, i == num - 1); in meson_i2c_xfer()
374 clk_disable(i2c->clk); in meson_i2c_xfer()
392 struct meson_i2c *i2c; in meson_i2c_probe() local
396 i2c = devm_kzalloc(&pdev->dev, sizeof(struct meson_i2c), GFP_KERNEL); in meson_i2c_probe()
397 if (!i2c) in meson_i2c_probe()
401 &i2c->frequency)) in meson_i2c_probe()
402 i2c->frequency = DEFAULT_FREQ; in meson_i2c_probe()
404 i2c->dev = &pdev->dev; in meson_i2c_probe()
405 platform_set_drvdata(pdev, i2c); in meson_i2c_probe()
407 spin_lock_init(&i2c->lock); in meson_i2c_probe()
408 init_completion(&i2c->done); in meson_i2c_probe()
410 i2c->clk = devm_clk_get(&pdev->dev, NULL); in meson_i2c_probe()
411 if (IS_ERR(i2c->clk)) { in meson_i2c_probe()
413 return PTR_ERR(i2c->clk); in meson_i2c_probe()
417 i2c->regs = devm_ioremap_resource(&pdev->dev, mem); in meson_i2c_probe()
418 if (IS_ERR(i2c->regs)) in meson_i2c_probe()
419 return PTR_ERR(i2c->regs); in meson_i2c_probe()
421 i2c->irq = platform_get_irq(pdev, 0); in meson_i2c_probe()
422 if (i2c->irq < 0) { in meson_i2c_probe()
424 return i2c->irq; in meson_i2c_probe()
427 ret = devm_request_irq(&pdev->dev, i2c->irq, meson_i2c_irq, in meson_i2c_probe()
428 0, dev_name(&pdev->dev), i2c); in meson_i2c_probe()
434 ret = clk_prepare(i2c->clk); in meson_i2c_probe()
440 strlcpy(i2c->adap.name, "Meson I2C adapter", in meson_i2c_probe()
441 sizeof(i2c->adap.name)); in meson_i2c_probe()
442 i2c->adap.owner = THIS_MODULE; in meson_i2c_probe()
443 i2c->adap.algo = &meson_i2c_algorithm; in meson_i2c_probe()
444 i2c->adap.dev.parent = &pdev->dev; in meson_i2c_probe()
445 i2c->adap.dev.of_node = np; in meson_i2c_probe()
446 i2c->adap.algo_data = i2c; in meson_i2c_probe()
452 meson_i2c_set_mask(i2c, REG_CTRL, REG_CTRL_START, 0); in meson_i2c_probe()
454 ret = i2c_add_adapter(&i2c->adap); in meson_i2c_probe()
456 clk_unprepare(i2c->clk); in meson_i2c_probe()
465 struct meson_i2c *i2c = platform_get_drvdata(pdev); in meson_i2c_remove() local
467 i2c_del_adapter(&i2c->adap); in meson_i2c_remove()
468 clk_unprepare(i2c->clk); in meson_i2c_remove()