Lines Matching full:i2c
13 #include <linux/i2c.h>
56 #define DEV(i2c) ((i2c)->adap.dev.parent) argument
73 static void zx2967_i2c_writel(struct zx2967_i2c *i2c, in zx2967_i2c_writel() argument
76 writel_relaxed(val, i2c->reg_base + reg); in zx2967_i2c_writel()
79 static u32 zx2967_i2c_readl(struct zx2967_i2c *i2c, unsigned long reg) in zx2967_i2c_readl() argument
81 return readl_relaxed(i2c->reg_base + reg); in zx2967_i2c_readl()
84 static void zx2967_i2c_writesb(struct zx2967_i2c *i2c, in zx2967_i2c_writesb() argument
87 writesb(i2c->reg_base + reg, data, len); in zx2967_i2c_writesb()
90 static void zx2967_i2c_readsb(struct zx2967_i2c *i2c, in zx2967_i2c_readsb() argument
93 readsb(i2c->reg_base + reg, data, len); in zx2967_i2c_readsb()
96 static void zx2967_i2c_start_ctrl(struct zx2967_i2c *i2c) in zx2967_i2c_start_ctrl() argument
101 status = zx2967_i2c_readl(i2c, REG_STAT); in zx2967_i2c_start_ctrl()
103 zx2967_i2c_writel(i2c, status, REG_STAT); in zx2967_i2c_start_ctrl()
105 ctl = zx2967_i2c_readl(i2c, REG_CMD); in zx2967_i2c_start_ctrl()
106 if (i2c->msg_rd) in zx2967_i2c_start_ctrl()
112 zx2967_i2c_writel(i2c, ctl, REG_CMD); in zx2967_i2c_start_ctrl()
115 static void zx2967_i2c_flush_fifos(struct zx2967_i2c *i2c) in zx2967_i2c_flush_fifos() argument
120 if (i2c->msg_rd) { in zx2967_i2c_flush_fifos()
128 val |= zx2967_i2c_readl(i2c, offset); in zx2967_i2c_flush_fifos()
129 zx2967_i2c_writel(i2c, val, offset); in zx2967_i2c_flush_fifos()
132 static int zx2967_i2c_empty_rx_fifo(struct zx2967_i2c *i2c, u32 size) in zx2967_i2c_empty_rx_fifo() argument
138 dev_err(DEV(i2c), "fifo size %d over the max value %d\n", in zx2967_i2c_empty_rx_fifo()
143 zx2967_i2c_readsb(i2c, val, REG_DATA, size); in zx2967_i2c_empty_rx_fifo()
145 *i2c->cur_trans++ = val[i]; in zx2967_i2c_empty_rx_fifo()
146 i2c->residue--; in zx2967_i2c_empty_rx_fifo()
154 static int zx2967_i2c_fill_tx_fifo(struct zx2967_i2c *i2c) in zx2967_i2c_fill_tx_fifo() argument
156 size_t residue = i2c->residue; in zx2967_i2c_fill_tx_fifo()
157 u8 *buf = i2c->cur_trans; in zx2967_i2c_fill_tx_fifo()
160 dev_err(DEV(i2c), "residue is %d\n", (int)residue); in zx2967_i2c_fill_tx_fifo()
165 zx2967_i2c_writesb(i2c, buf, REG_DATA, residue); in zx2967_i2c_fill_tx_fifo()
168 i2c->residue = 0; in zx2967_i2c_fill_tx_fifo()
169 i2c->cur_trans = NULL; in zx2967_i2c_fill_tx_fifo()
171 zx2967_i2c_writesb(i2c, buf, REG_DATA, I2C_FIFO_MAX); in zx2967_i2c_fill_tx_fifo()
172 i2c->residue -= I2C_FIFO_MAX; in zx2967_i2c_fill_tx_fifo()
173 i2c->cur_trans += I2C_FIFO_MAX; in zx2967_i2c_fill_tx_fifo()
181 static int zx2967_i2c_reset_hardware(struct zx2967_i2c *i2c) in zx2967_i2c_reset_hardware() argument
187 zx2967_i2c_writel(i2c, val, REG_CMD); in zx2967_i2c_reset_hardware()
189 clk_div = clk_get_rate(i2c->clk) / i2c->clk_freq - 1; in zx2967_i2c_reset_hardware()
190 zx2967_i2c_writel(i2c, clk_div, REG_CLK_DIV_FS); in zx2967_i2c_reset_hardware()
191 zx2967_i2c_writel(i2c, clk_div, REG_CLK_DIV_HS); in zx2967_i2c_reset_hardware()
193 zx2967_i2c_writel(i2c, I2C_FIFO_MAX - 1, REG_WRCONF); in zx2967_i2c_reset_hardware()
194 zx2967_i2c_writel(i2c, I2C_FIFO_MAX - 1, REG_RDCONF); in zx2967_i2c_reset_hardware()
195 zx2967_i2c_writel(i2c, 1, REG_RDCONF); in zx2967_i2c_reset_hardware()
197 zx2967_i2c_flush_fifos(i2c); in zx2967_i2c_reset_hardware()
202 static void zx2967_i2c_isr_clr(struct zx2967_i2c *i2c) in zx2967_i2c_isr_clr() argument
206 status = zx2967_i2c_readl(i2c, REG_STAT); in zx2967_i2c_isr_clr()
208 zx2967_i2c_writel(i2c, status, REG_STAT); in zx2967_i2c_isr_clr()
214 struct zx2967_i2c *i2c = (struct zx2967_i2c *)dev_id; in zx2967_i2c_isr() local
216 status = zx2967_i2c_readl(i2c, REG_STAT) & I2C_INT_MASK; in zx2967_i2c_isr()
217 zx2967_i2c_isr_clr(i2c); in zx2967_i2c_isr()
220 i2c->error = -ENXIO; in zx2967_i2c_isr()
222 i2c->error = -EIO; in zx2967_i2c_isr()
224 i2c->error = 0; in zx2967_i2c_isr()
228 complete(&i2c->complete); in zx2967_i2c_isr()
233 static void zx2967_set_addr(struct zx2967_i2c *i2c, u16 addr) in zx2967_set_addr() argument
238 zx2967_i2c_writel(i2c, val, REG_DEVADDR_L); in zx2967_set_addr()
241 zx2967_i2c_writel(i2c, val, REG_DEVADDR_H); in zx2967_set_addr()
243 val = zx2967_i2c_readl(i2c, REG_CMD) | I2C_ADDR_MODE_TEN; in zx2967_set_addr()
245 val = zx2967_i2c_readl(i2c, REG_CMD) & ~I2C_ADDR_MODE_TEN; in zx2967_set_addr()
246 zx2967_i2c_writel(i2c, val, REG_CMD); in zx2967_set_addr()
249 static int zx2967_i2c_xfer_bytes(struct zx2967_i2c *i2c, u32 bytes) in zx2967_i2c_xfer_bytes() argument
252 int rd = i2c->msg_rd; in zx2967_i2c_xfer_bytes()
255 reinit_completion(&i2c->complete); in zx2967_i2c_xfer_bytes()
258 zx2967_i2c_writel(i2c, bytes - 1, REG_RDCONF); in zx2967_i2c_xfer_bytes()
260 ret = zx2967_i2c_fill_tx_fifo(i2c); in zx2967_i2c_xfer_bytes()
265 zx2967_i2c_start_ctrl(i2c); in zx2967_i2c_xfer_bytes()
267 time_left = wait_for_completion_timeout(&i2c->complete, in zx2967_i2c_xfer_bytes()
272 if (i2c->error) in zx2967_i2c_xfer_bytes()
273 return i2c->error; in zx2967_i2c_xfer_bytes()
275 return rd ? zx2967_i2c_empty_rx_fifo(i2c, bytes) : 0; in zx2967_i2c_xfer_bytes()
278 static int zx2967_i2c_xfer_msg(struct zx2967_i2c *i2c, in zx2967_i2c_xfer_msg() argument
284 zx2967_i2c_flush_fifos(i2c); in zx2967_i2c_xfer_msg()
286 i2c->cur_trans = msg->buf; in zx2967_i2c_xfer_msg()
287 i2c->residue = msg->len; in zx2967_i2c_xfer_msg()
288 i2c->access_cnt = msg->len / I2C_FIFO_MAX; in zx2967_i2c_xfer_msg()
289 i2c->msg_rd = msg->flags & I2C_M_RD; in zx2967_i2c_xfer_msg()
291 for (i = 0; i < i2c->access_cnt; i++) { in zx2967_i2c_xfer_msg()
292 ret = zx2967_i2c_xfer_bytes(i2c, I2C_FIFO_MAX); in zx2967_i2c_xfer_msg()
297 if (i2c->residue > 0) { in zx2967_i2c_xfer_msg()
298 ret = zx2967_i2c_xfer_bytes(i2c, i2c->residue); in zx2967_i2c_xfer_msg()
303 i2c->residue = 0; in zx2967_i2c_xfer_msg()
304 i2c->access_cnt = 0; in zx2967_i2c_xfer_msg()
312 struct zx2967_i2c *i2c = i2c_get_adapdata(adap); in zx2967_i2c_xfer() local
316 if (i2c->is_suspended) in zx2967_i2c_xfer()
319 zx2967_set_addr(i2c, msgs->addr); in zx2967_i2c_xfer()
322 ret = zx2967_i2c_xfer_msg(i2c, &msgs[i]); in zx2967_i2c_xfer()
331 zx2967_smbus_xfer_prepare(struct zx2967_i2c *i2c, u16 addr, in zx2967_smbus_xfer_prepare() argument
337 val = zx2967_i2c_readl(i2c, REG_RDCONF); in zx2967_smbus_xfer_prepare()
339 zx2967_i2c_writel(i2c, val, REG_RDCONF); in zx2967_smbus_xfer_prepare()
340 zx2967_set_addr(i2c, addr); in zx2967_smbus_xfer_prepare()
341 val = zx2967_i2c_readl(i2c, REG_CMD); in zx2967_smbus_xfer_prepare()
343 zx2967_i2c_writel(i2c, val, REG_CMD); in zx2967_smbus_xfer_prepare()
347 zx2967_i2c_writel(i2c, command, REG_DATA); in zx2967_smbus_xfer_prepare()
350 zx2967_i2c_writel(i2c, command, REG_DATA); in zx2967_smbus_xfer_prepare()
352 zx2967_i2c_writel(i2c, data->byte, REG_DATA); in zx2967_smbus_xfer_prepare()
355 zx2967_i2c_writel(i2c, command, REG_DATA); in zx2967_smbus_xfer_prepare()
357 zx2967_i2c_writel(i2c, (data->word >> 8), REG_DATA); in zx2967_smbus_xfer_prepare()
358 zx2967_i2c_writel(i2c, (data->word & 0xff), in zx2967_smbus_xfer_prepare()
365 static int zx2967_smbus_xfer_read(struct zx2967_i2c *i2c, int size, in zx2967_smbus_xfer_read() argument
372 reinit_completion(&i2c->complete); in zx2967_smbus_xfer_read()
374 val = zx2967_i2c_readl(i2c, REG_CMD); in zx2967_smbus_xfer_read()
376 zx2967_i2c_writel(i2c, val, REG_CMD); in zx2967_smbus_xfer_read()
378 val = zx2967_i2c_readl(i2c, REG_CMD); in zx2967_smbus_xfer_read()
380 zx2967_i2c_writel(i2c, val, REG_CMD); in zx2967_smbus_xfer_read()
382 time_left = wait_for_completion_timeout(&i2c->complete, in zx2967_smbus_xfer_read()
387 if (i2c->error) in zx2967_smbus_xfer_read()
388 return i2c->error; in zx2967_smbus_xfer_read()
393 val = zx2967_i2c_readl(i2c, REG_DATA); in zx2967_smbus_xfer_read()
398 buf[0] = zx2967_i2c_readl(i2c, REG_DATA); in zx2967_smbus_xfer_read()
399 buf[1] = zx2967_i2c_readl(i2c, REG_DATA); in zx2967_smbus_xfer_read()
409 static int zx2967_smbus_xfer_write(struct zx2967_i2c *i2c) in zx2967_smbus_xfer_write() argument
414 reinit_completion(&i2c->complete); in zx2967_smbus_xfer_write()
415 val = zx2967_i2c_readl(i2c, REG_CMD); in zx2967_smbus_xfer_write()
417 zx2967_i2c_writel(i2c, val, REG_CMD); in zx2967_smbus_xfer_write()
419 time_left = wait_for_completion_timeout(&i2c->complete, in zx2967_smbus_xfer_write()
424 if (i2c->error) in zx2967_smbus_xfer_write()
425 return i2c->error; in zx2967_smbus_xfer_write()
434 struct zx2967_i2c *i2c = i2c_get_adapdata(adap); in zx2967_smbus_xfer() local
444 zx2967_smbus_xfer_prepare(i2c, addr, read_write, in zx2967_smbus_xfer()
452 return zx2967_smbus_xfer_read(i2c, size, data); in zx2967_smbus_xfer()
454 return zx2967_smbus_xfer_write(i2c); in zx2967_smbus_xfer()
471 struct zx2967_i2c *i2c = dev_get_drvdata(dev); in zx2967_i2c_suspend() local
473 i2c->is_suspended = true; in zx2967_i2c_suspend()
474 clk_disable_unprepare(i2c->clk); in zx2967_i2c_suspend()
481 struct zx2967_i2c *i2c = dev_get_drvdata(dev); in zx2967_i2c_resume() local
483 i2c->is_suspended = false; in zx2967_i2c_resume()
484 clk_prepare_enable(i2c->clk); in zx2967_i2c_resume()
503 { .compatible = "zte,zx296718-i2c", },
510 struct zx2967_i2c *i2c; in zx2967_i2c_probe() local
516 i2c = devm_kzalloc(&pdev->dev, sizeof(*i2c), GFP_KERNEL); in zx2967_i2c_probe()
517 if (!i2c) in zx2967_i2c_probe()
538 &i2c->clk_freq); in zx2967_i2c_probe()
548 i2c->irq = ret; in zx2967_i2c_probe()
549 i2c->reg_base = reg_base; in zx2967_i2c_probe()
550 i2c->clk = clk; in zx2967_i2c_probe()
552 init_completion(&i2c->complete); in zx2967_i2c_probe()
553 platform_set_drvdata(pdev, i2c); in zx2967_i2c_probe()
555 ret = zx2967_i2c_reset_hardware(i2c); in zx2967_i2c_probe()
557 dev_err(&pdev->dev, "failed to initialize i2c controller\n"); in zx2967_i2c_probe()
561 ret = devm_request_irq(&pdev->dev, i2c->irq, in zx2967_i2c_probe()
562 zx2967_i2c_isr, 0, dev_name(&pdev->dev), i2c); in zx2967_i2c_probe()
564 dev_err(&pdev->dev, "failed to request irq %i\n", i2c->irq); in zx2967_i2c_probe()
568 i2c_set_adapdata(&i2c->adap, i2c); in zx2967_i2c_probe()
569 strlcpy(i2c->adap.name, "zx2967 i2c adapter", in zx2967_i2c_probe()
570 sizeof(i2c->adap.name)); in zx2967_i2c_probe()
571 i2c->adap.algo = &zx2967_i2c_algo; in zx2967_i2c_probe()
572 i2c->adap.quirks = &zx2967_i2c_quirks; in zx2967_i2c_probe()
573 i2c->adap.nr = pdev->id; in zx2967_i2c_probe()
574 i2c->adap.dev.parent = &pdev->dev; in zx2967_i2c_probe()
575 i2c->adap.dev.of_node = pdev->dev.of_node; in zx2967_i2c_probe()
577 ret = i2c_add_numbered_adapter(&i2c->adap); in zx2967_i2c_probe()
584 clk_disable_unprepare(i2c->clk); in zx2967_i2c_probe()
590 struct zx2967_i2c *i2c = platform_get_drvdata(pdev); in zx2967_i2c_remove() local
592 i2c_del_adapter(&i2c->adap); in zx2967_i2c_remove()
593 clk_disable_unprepare(i2c->clk); in zx2967_i2c_remove()
610 MODULE_DESCRIPTION("ZTE ZX2967 I2C Bus Controller driver");