Lines Matching refs:idev
103 altr_i2c_int_enable(struct altr_i2c_dev *idev, u32 mask, bool enable) in altr_i2c_int_enable() argument
108 spin_lock_irqsave(&idev->lock, flags); in altr_i2c_int_enable()
110 int_en = readl(idev->base + ALTR_I2C_ISER); in altr_i2c_int_enable()
112 idev->isr_mask = int_en | mask; in altr_i2c_int_enable()
114 idev->isr_mask = int_en & ~mask; in altr_i2c_int_enable()
116 writel(idev->isr_mask, idev->base + ALTR_I2C_ISER); in altr_i2c_int_enable()
118 spin_unlock_irqrestore(&idev->lock, flags); in altr_i2c_int_enable()
121 static void altr_i2c_int_clear(struct altr_i2c_dev *idev, u32 mask) in altr_i2c_int_clear() argument
123 u32 int_en = readl(idev->base + ALTR_I2C_ISR); in altr_i2c_int_clear()
125 writel(int_en | mask, idev->base + ALTR_I2C_ISR); in altr_i2c_int_clear()
128 static void altr_i2c_core_disable(struct altr_i2c_dev *idev) in altr_i2c_core_disable() argument
130 u32 tmp = readl(idev->base + ALTR_I2C_CTRL); in altr_i2c_core_disable()
132 writel(tmp & ~ALTR_I2C_CTRL_EN, idev->base + ALTR_I2C_CTRL); in altr_i2c_core_disable()
135 static void altr_i2c_core_enable(struct altr_i2c_dev *idev) in altr_i2c_core_enable() argument
137 u32 tmp = readl(idev->base + ALTR_I2C_CTRL); in altr_i2c_core_enable()
139 writel(tmp | ALTR_I2C_CTRL_EN, idev->base + ALTR_I2C_CTRL); in altr_i2c_core_enable()
142 static void altr_i2c_reset(struct altr_i2c_dev *idev) in altr_i2c_reset() argument
144 altr_i2c_core_disable(idev); in altr_i2c_reset()
145 altr_i2c_core_enable(idev); in altr_i2c_reset()
148 static inline void altr_i2c_stop(struct altr_i2c_dev *idev) in altr_i2c_stop() argument
150 writel(ALTR_I2C_TFR_CMD_STO, idev->base + ALTR_I2C_TFR_CMD); in altr_i2c_stop()
153 static void altr_i2c_init(struct altr_i2c_dev *idev) in altr_i2c_init() argument
155 u32 divisor = clk_get_rate(idev->i2c_clk) / idev->bus_clk_rate; in altr_i2c_init()
156 u32 clk_mhz = clk_get_rate(idev->i2c_clk) / 1000000; in altr_i2c_init()
161 if (idev->bus_clk_rate <= 100000) { in altr_i2c_init()
172 writel(tmp, idev->base + ALTR_I2C_CTRL); in altr_i2c_init()
174 dev_dbg(idev->dev, "rate=%uHz per_clk=%uMHz -> ratio=1:%u\n", in altr_i2c_init()
175 idev->bus_clk_rate, clk_mhz, divisor); in altr_i2c_init()
178 altr_i2c_reset(idev); in altr_i2c_init()
181 writel(t_high, idev->base + ALTR_I2C_SCL_HIGH); in altr_i2c_init()
183 writel(t_low, idev->base + ALTR_I2C_SCL_LOW); in altr_i2c_init()
185 writel(div_u64(300 * clk_mhz, 1000), idev->base + ALTR_I2C_SDA_HOLD); in altr_i2c_init()
188 altr_i2c_int_enable(idev, ALTR_I2C_ALL_IRQ, false); in altr_i2c_init()
195 static void altr_i2c_transfer(struct altr_i2c_dev *idev, u32 data) in altr_i2c_transfer() argument
198 if (idev->msg_len == 1) in altr_i2c_transfer()
200 if (idev->msg_len > 0) in altr_i2c_transfer()
201 writel(data, idev->base + ALTR_I2C_TFR_CMD); in altr_i2c_transfer()
208 static void altr_i2c_empty_rx_fifo(struct altr_i2c_dev *idev) in altr_i2c_empty_rx_fifo() argument
210 size_t rx_fifo_avail = readl(idev->base + ALTR_I2C_RX_FIFO_LVL); in altr_i2c_empty_rx_fifo()
211 int bytes_to_transfer = min(rx_fifo_avail, idev->msg_len); in altr_i2c_empty_rx_fifo()
214 *idev->buf++ = readl(idev->base + ALTR_I2C_RX_DATA); in altr_i2c_empty_rx_fifo()
215 idev->msg_len--; in altr_i2c_empty_rx_fifo()
216 altr_i2c_transfer(idev, 0); in altr_i2c_empty_rx_fifo()
224 static int altr_i2c_fill_tx_fifo(struct altr_i2c_dev *idev) in altr_i2c_fill_tx_fifo() argument
226 size_t tx_fifo_avail = idev->fifo_size - readl(idev->base + in altr_i2c_fill_tx_fifo()
228 int bytes_to_transfer = min(tx_fifo_avail, idev->msg_len); in altr_i2c_fill_tx_fifo()
229 int ret = idev->msg_len - bytes_to_transfer; in altr_i2c_fill_tx_fifo()
232 altr_i2c_transfer(idev, *idev->buf++); in altr_i2c_fill_tx_fifo()
233 idev->msg_len--; in altr_i2c_fill_tx_fifo()
241 struct altr_i2c_dev *idev = _dev; in altr_i2c_isr_quick() local
245 idev->isr_status = readl(idev->base + ALTR_I2C_ISR) & idev->isr_mask; in altr_i2c_isr_quick()
246 if (idev->isr_status) in altr_i2c_isr_quick()
256 struct altr_i2c_dev *idev = _dev; in altr_i2c_isr() local
257 u32 status = idev->isr_status; in altr_i2c_isr()
259 if (!idev->msg) { in altr_i2c_isr()
260 dev_warn(idev->dev, "unexpected interrupt\n"); in altr_i2c_isr()
261 altr_i2c_int_clear(idev, ALTR_I2C_ALL_IRQ); in altr_i2c_isr()
264 read = (idev->msg->flags & I2C_M_RD) != 0; in altr_i2c_isr()
268 altr_i2c_int_clear(idev, ALTR_I2C_ISR_ARB); in altr_i2c_isr()
269 idev->msg_err = -EAGAIN; in altr_i2c_isr()
272 dev_dbg(idev->dev, "Could not get ACK\n"); in altr_i2c_isr()
273 idev->msg_err = -ENXIO; in altr_i2c_isr()
274 altr_i2c_int_clear(idev, ALTR_I2C_ISR_NACK); in altr_i2c_isr()
275 altr_i2c_stop(idev); in altr_i2c_isr()
279 altr_i2c_empty_rx_fifo(idev); in altr_i2c_isr()
280 altr_i2c_int_clear(idev, ALTR_I2C_ISR_RXRDY); in altr_i2c_isr()
281 altr_i2c_stop(idev); in altr_i2c_isr()
282 dev_err(idev->dev, "RX FIFO Overflow\n"); in altr_i2c_isr()
286 altr_i2c_empty_rx_fifo(idev); in altr_i2c_isr()
287 altr_i2c_int_clear(idev, ALTR_I2C_ISR_RXRDY); in altr_i2c_isr()
288 if (!idev->msg_len) in altr_i2c_isr()
292 altr_i2c_int_clear(idev, ALTR_I2C_ISR_TXRDY); in altr_i2c_isr()
293 if (idev->msg_len > 0) in altr_i2c_isr()
294 altr_i2c_fill_tx_fifo(idev); in altr_i2c_isr()
298 dev_warn(idev->dev, "Unexpected interrupt: 0x%x\n", status); in altr_i2c_isr()
299 altr_i2c_int_clear(idev, ALTR_I2C_ALL_IRQ); in altr_i2c_isr()
304 ret = readl_poll_timeout_atomic(idev->base + ALTR_I2C_STATUS, in altr_i2c_isr()
309 dev_err(idev->dev, "message timeout\n"); in altr_i2c_isr()
310 altr_i2c_int_enable(idev, ALTR_I2C_ALL_IRQ, false); in altr_i2c_isr()
311 altr_i2c_int_clear(idev, ALTR_I2C_ALL_IRQ); in altr_i2c_isr()
312 complete(&idev->msg_complete); in altr_i2c_isr()
313 dev_dbg(idev->dev, "Message Complete\n"); in altr_i2c_isr()
319 static int altr_i2c_xfer_msg(struct altr_i2c_dev *idev, struct i2c_msg *msg) in altr_i2c_xfer_msg() argument
326 idev->msg = msg; in altr_i2c_xfer_msg()
327 idev->msg_len = msg->len; in altr_i2c_xfer_msg()
328 idev->buf = msg->buf; in altr_i2c_xfer_msg()
329 idev->msg_err = 0; in altr_i2c_xfer_msg()
330 reinit_completion(&idev->msg_complete); in altr_i2c_xfer_msg()
331 altr_i2c_core_enable(idev); in altr_i2c_xfer_msg()
335 readl(idev->base + ALTR_I2C_RX_DATA); in altr_i2c_xfer_msg()
336 } while (readl(idev->base + ALTR_I2C_RX_FIFO_LVL)); in altr_i2c_xfer_msg()
338 writel(ALTR_I2C_TFR_CMD_STA | addr, idev->base + ALTR_I2C_TFR_CMD); in altr_i2c_xfer_msg()
342 altr_i2c_int_enable(idev, imask, true); in altr_i2c_xfer_msg()
344 altr_i2c_transfer(idev, 0); in altr_i2c_xfer_msg()
347 altr_i2c_int_enable(idev, imask, true); in altr_i2c_xfer_msg()
348 altr_i2c_fill_tx_fifo(idev); in altr_i2c_xfer_msg()
351 time_left = wait_for_completion_timeout(&idev->msg_complete, in altr_i2c_xfer_msg()
353 altr_i2c_int_enable(idev, imask, false); in altr_i2c_xfer_msg()
355 value = readl(idev->base + ALTR_I2C_STATUS) & ALTR_I2C_STAT_CORE; in altr_i2c_xfer_msg()
357 dev_err(idev->dev, "Core Status not IDLE...\n"); in altr_i2c_xfer_msg()
360 idev->msg_err = -ETIMEDOUT; in altr_i2c_xfer_msg()
361 dev_dbg(idev->dev, "Transaction timed out.\n"); in altr_i2c_xfer_msg()
364 altr_i2c_core_disable(idev); in altr_i2c_xfer_msg()
366 return idev->msg_err; in altr_i2c_xfer_msg()
372 struct altr_i2c_dev *idev = i2c_get_adapdata(adap); in altr_i2c_xfer() local
376 ret = altr_i2c_xfer_msg(idev, msgs++); in altr_i2c_xfer()
395 struct altr_i2c_dev *idev = NULL; in altr_i2c_probe() local
400 idev = devm_kzalloc(&pdev->dev, sizeof(*idev), GFP_KERNEL); in altr_i2c_probe()
401 if (!idev) in altr_i2c_probe()
405 idev->base = devm_ioremap_resource(&pdev->dev, res); in altr_i2c_probe()
406 if (IS_ERR(idev->base)) in altr_i2c_probe()
407 return PTR_ERR(idev->base); in altr_i2c_probe()
415 idev->i2c_clk = devm_clk_get(&pdev->dev, NULL); in altr_i2c_probe()
416 if (IS_ERR(idev->i2c_clk)) { in altr_i2c_probe()
418 return PTR_ERR(idev->i2c_clk); in altr_i2c_probe()
421 idev->dev = &pdev->dev; in altr_i2c_probe()
422 init_completion(&idev->msg_complete); in altr_i2c_probe()
423 spin_lock_init(&idev->lock); in altr_i2c_probe()
425 val = device_property_read_u32(idev->dev, "fifo-size", in altr_i2c_probe()
426 &idev->fifo_size); in altr_i2c_probe()
430 idev->fifo_size = ALTR_I2C_DFLT_FIFO_SZ; in altr_i2c_probe()
433 val = device_property_read_u32(idev->dev, "clock-frequency", in altr_i2c_probe()
434 &idev->bus_clk_rate); in altr_i2c_probe()
437 idev->bus_clk_rate = 100000; /* default clock rate */ in altr_i2c_probe()
440 if (idev->bus_clk_rate > 400000) { in altr_i2c_probe()
442 idev->bus_clk_rate); in altr_i2c_probe()
448 pdev->name, idev); in altr_i2c_probe()
454 ret = clk_prepare_enable(idev->i2c_clk); in altr_i2c_probe()
460 altr_i2c_init(idev); in altr_i2c_probe()
462 i2c_set_adapdata(&idev->adapter, idev); in altr_i2c_probe()
463 strlcpy(idev->adapter.name, pdev->name, sizeof(idev->adapter.name)); in altr_i2c_probe()
464 idev->adapter.owner = THIS_MODULE; in altr_i2c_probe()
465 idev->adapter.algo = &altr_i2c_algo; in altr_i2c_probe()
466 idev->adapter.dev.parent = &pdev->dev; in altr_i2c_probe()
467 idev->adapter.dev.of_node = pdev->dev.of_node; in altr_i2c_probe()
469 platform_set_drvdata(pdev, idev); in altr_i2c_probe()
471 ret = i2c_add_adapter(&idev->adapter); in altr_i2c_probe()
473 clk_disable_unprepare(idev->i2c_clk); in altr_i2c_probe()
483 struct altr_i2c_dev *idev = platform_get_drvdata(pdev); in altr_i2c_remove() local
485 clk_disable_unprepare(idev->i2c_clk); in altr_i2c_remove()
486 i2c_del_adapter(&idev->adapter); in altr_i2c_remove()