Lines Matching refs:i2c
10 #include <linux/i2c.h>
53 #define DEV(i2c) ((i2c)->adap.dev.parent)
69 static void zx2967_i2c_writel(struct zx2967_i2c *i2c,
72 writel_relaxed(val, i2c->reg_base + reg);
75 static u32 zx2967_i2c_readl(struct zx2967_i2c *i2c, unsigned long reg)
77 return readl_relaxed(i2c->reg_base + reg);
80 static void zx2967_i2c_writesb(struct zx2967_i2c *i2c,
83 writesb(i2c->reg_base + reg, data, len);
86 static void zx2967_i2c_readsb(struct zx2967_i2c *i2c,
89 readsb(i2c->reg_base + reg, data, len);
92 static void zx2967_i2c_start_ctrl(struct zx2967_i2c *i2c)
97 status = zx2967_i2c_readl(i2c, REG_STAT);
99 zx2967_i2c_writel(i2c, status, REG_STAT);
101 ctl = zx2967_i2c_readl(i2c, REG_CMD);
102 if (i2c->msg_rd)
108 zx2967_i2c_writel(i2c, ctl, REG_CMD);
111 static void zx2967_i2c_flush_fifos(struct zx2967_i2c *i2c)
116 if (i2c->msg_rd) {
124 val |= zx2967_i2c_readl(i2c, offset);
125 zx2967_i2c_writel(i2c, val, offset);
128 static int zx2967_i2c_empty_rx_fifo(struct zx2967_i2c *i2c, u32 size)
134 dev_err(DEV(i2c), "fifo size %d over the max value %d\n",
139 zx2967_i2c_readsb(i2c, val, REG_DATA, size);
141 *i2c->cur_trans++ = val[i];
142 i2c->residue--;
150 static int zx2967_i2c_fill_tx_fifo(struct zx2967_i2c *i2c)
152 size_t residue = i2c->residue;
153 u8 *buf = i2c->cur_trans;
156 dev_err(DEV(i2c), "residue is %d\n", (int)residue);
161 zx2967_i2c_writesb(i2c, buf, REG_DATA, residue);
164 i2c->residue = 0;
165 i2c->cur_trans = NULL;
167 zx2967_i2c_writesb(i2c, buf, REG_DATA, I2C_FIFO_MAX);
168 i2c->residue -= I2C_FIFO_MAX;
169 i2c->cur_trans += I2C_FIFO_MAX;
177 static int zx2967_i2c_reset_hardware(struct zx2967_i2c *i2c)
183 zx2967_i2c_writel(i2c, val, REG_CMD);
185 clk_div = clk_get_rate(i2c->clk) / i2c->clk_freq - 1;
186 zx2967_i2c_writel(i2c, clk_div, REG_CLK_DIV_FS);
187 zx2967_i2c_writel(i2c, clk_div, REG_CLK_DIV_HS);
189 zx2967_i2c_writel(i2c, I2C_FIFO_MAX - 1, REG_WRCONF);
190 zx2967_i2c_writel(i2c, I2C_FIFO_MAX - 1, REG_RDCONF);
191 zx2967_i2c_writel(i2c, 1, REG_RDCONF);
193 zx2967_i2c_flush_fifos(i2c);
198 static void zx2967_i2c_isr_clr(struct zx2967_i2c *i2c)
202 status = zx2967_i2c_readl(i2c, REG_STAT);
204 zx2967_i2c_writel(i2c, status, REG_STAT);
210 struct zx2967_i2c *i2c = (struct zx2967_i2c *)dev_id;
212 status = zx2967_i2c_readl(i2c, REG_STAT) & I2C_INT_MASK;
213 zx2967_i2c_isr_clr(i2c);
216 i2c->error = -ENXIO;
218 i2c->error = -EIO;
220 i2c->error = 0;
224 complete(&i2c->complete);
229 static void zx2967_set_addr(struct zx2967_i2c *i2c, u16 addr)
234 zx2967_i2c_writel(i2c, val, REG_DEVADDR_L);
237 zx2967_i2c_writel(i2c, val, REG_DEVADDR_H);
239 val = zx2967_i2c_readl(i2c, REG_CMD) | I2C_ADDR_MODE_TEN;
241 val = zx2967_i2c_readl(i2c, REG_CMD) & ~I2C_ADDR_MODE_TEN;
242 zx2967_i2c_writel(i2c, val, REG_CMD);
245 static int zx2967_i2c_xfer_bytes(struct zx2967_i2c *i2c, u32 bytes)
248 int rd = i2c->msg_rd;
251 reinit_completion(&i2c->complete);
254 zx2967_i2c_writel(i2c, bytes - 1, REG_RDCONF);
256 ret = zx2967_i2c_fill_tx_fifo(i2c);
261 zx2967_i2c_start_ctrl(i2c);
263 time_left = wait_for_completion_timeout(&i2c->complete,
268 if (i2c->error)
269 return i2c->error;
271 return rd ? zx2967_i2c_empty_rx_fifo(i2c, bytes) : 0;
274 static int zx2967_i2c_xfer_msg(struct zx2967_i2c *i2c,
280 zx2967_i2c_flush_fifos(i2c);
282 i2c->cur_trans = msg->buf;
283 i2c->residue = msg->len;
284 i2c->access_cnt = msg->len / I2C_FIFO_MAX;
285 i2c->msg_rd = msg->flags & I2C_M_RD;
287 for (i = 0; i < i2c->access_cnt; i++) {
288 ret = zx2967_i2c_xfer_bytes(i2c, I2C_FIFO_MAX);
293 if (i2c->residue > 0) {
294 ret = zx2967_i2c_xfer_bytes(i2c, i2c->residue);
299 i2c->residue = 0;
300 i2c->access_cnt = 0;
308 struct zx2967_i2c *i2c = i2c_get_adapdata(adap);
312 zx2967_set_addr(i2c, msgs->addr);
315 ret = zx2967_i2c_xfer_msg(i2c, &msgs[i]);
324 zx2967_smbus_xfer_prepare(struct zx2967_i2c *i2c, u16 addr,
330 val = zx2967_i2c_readl(i2c, REG_RDCONF);
332 zx2967_i2c_writel(i2c, val, REG_RDCONF);
333 zx2967_set_addr(i2c, addr);
334 val = zx2967_i2c_readl(i2c, REG_CMD);
336 zx2967_i2c_writel(i2c, val, REG_CMD);
340 zx2967_i2c_writel(i2c, command, REG_DATA);
343 zx2967_i2c_writel(i2c, command, REG_DATA);
345 zx2967_i2c_writel(i2c, data->byte, REG_DATA);
348 zx2967_i2c_writel(i2c, command, REG_DATA);
350 zx2967_i2c_writel(i2c, (data->word >> 8), REG_DATA);
351 zx2967_i2c_writel(i2c, (data->word & 0xff),
358 static int zx2967_smbus_xfer_read(struct zx2967_i2c *i2c, int size,
365 reinit_completion(&i2c->complete);
367 val = zx2967_i2c_readl(i2c, REG_CMD);
369 zx2967_i2c_writel(i2c, val, REG_CMD);
371 val = zx2967_i2c_readl(i2c, REG_CMD);
373 zx2967_i2c_writel(i2c, val, REG_CMD);
375 time_left = wait_for_completion_timeout(&i2c->complete,
380 if (i2c->error)
381 return i2c->error;
386 val = zx2967_i2c_readl(i2c, REG_DATA);
391 buf[0] = zx2967_i2c_readl(i2c, REG_DATA);
392 buf[1] = zx2967_i2c_readl(i2c, REG_DATA);
402 static int zx2967_smbus_xfer_write(struct zx2967_i2c *i2c)
407 reinit_completion(&i2c->complete);
408 val = zx2967_i2c_readl(i2c, REG_CMD);
410 zx2967_i2c_writel(i2c, val, REG_CMD);
412 time_left = wait_for_completion_timeout(&i2c->complete,
417 if (i2c->error)
418 return i2c->error;
427 struct zx2967_i2c *i2c = i2c_get_adapdata(adap);
437 zx2967_smbus_xfer_prepare(i2c, addr, read_write,
445 return zx2967_smbus_xfer_read(i2c, size, data);
447 return zx2967_smbus_xfer_write(i2c);
464 struct zx2967_i2c *i2c = dev_get_drvdata(dev);
466 i2c_mark_adapter_suspended(&i2c->adap);
467 clk_disable_unprepare(i2c->clk);
474 struct zx2967_i2c *i2c = dev_get_drvdata(dev);
476 clk_prepare_enable(i2c->clk);
477 i2c_mark_adapter_resumed(&i2c->adap);
496 { .compatible = "zte,zx296718-i2c", },
503 struct zx2967_i2c *i2c;
508 i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL);
509 if (!i2c)
529 &i2c->clk_freq);
539 i2c->irq = ret;
540 i2c->reg_base = reg_base;
541 i2c->clk = clk;
543 init_completion(&i2c->complete);
544 platform_set_drvdata(pdev, i2c);
546 ret = zx2967_i2c_reset_hardware(i2c);
548 dev_err(&pdev->dev, "failed to initialize i2c controller\n");
552 ret = devm_request_irq(&pdev->dev, i2c->irq,
553 zx2967_i2c_isr, 0, dev_name(&pdev->dev), i2c);
555 dev_err(&pdev->dev, "failed to request irq %i\n", i2c->irq);
559 i2c_set_adapdata(&i2c->adap, i2c);
560 strlcpy(i2c->adap.name, "zx2967 i2c adapter",
561 sizeof(i2c->adap.name));
562 i2c->adap.algo = &zx2967_i2c_algo;
563 i2c->adap.quirks = &zx2967_i2c_quirks;
564 i2c->adap.nr = pdev->id;
565 i2c->adap.dev.parent = &pdev->dev;
566 i2c->adap.dev.of_node = pdev->dev.of_node;
568 ret = i2c_add_numbered_adapter(&i2c->adap);
575 clk_disable_unprepare(i2c->clk);
581 struct zx2967_i2c *i2c = platform_get_drvdata(pdev);
583 i2c_del_adapter(&i2c->adap);
584 clk_disable_unprepare(i2c->clk);