Lines Matching refs:i2c
126 static inline void i2c_writel(struct rk3x_i2c *i2c, u32 value, in i2c_writel() argument
129 writel(value, i2c->regs + offset); in i2c_writel()
132 static inline u32 i2c_readl(struct rk3x_i2c *i2c, unsigned int offset) in i2c_readl() argument
134 return readl(i2c->regs + offset); in i2c_readl()
138 static inline void rk3x_i2c_clean_ipd(struct rk3x_i2c *i2c) in rk3x_i2c_clean_ipd() argument
140 i2c_writel(i2c, REG_INT_ALL, REG_IPD); in rk3x_i2c_clean_ipd()
146 static void rk3x_i2c_start(struct rk3x_i2c *i2c) in rk3x_i2c_start() argument
150 rk3x_i2c_clean_ipd(i2c); in rk3x_i2c_start()
151 i2c_writel(i2c, REG_INT_START, REG_IEN); in rk3x_i2c_start()
154 val = REG_CON_EN | REG_CON_MOD(i2c->mode) | REG_CON_START; in rk3x_i2c_start()
157 if (!(i2c->msg->flags & I2C_M_IGNORE_NAK)) in rk3x_i2c_start()
160 i2c_writel(i2c, val, REG_CON); in rk3x_i2c_start()
168 static void rk3x_i2c_stop(struct rk3x_i2c *i2c, int error) in rk3x_i2c_stop() argument
172 i2c->processed = 0; in rk3x_i2c_stop()
173 i2c->msg = NULL; in rk3x_i2c_stop()
174 i2c->error = error; in rk3x_i2c_stop()
176 if (i2c->is_last_msg) { in rk3x_i2c_stop()
178 i2c_writel(i2c, REG_INT_STOP, REG_IEN); in rk3x_i2c_stop()
180 i2c->state = STATE_STOP; in rk3x_i2c_stop()
182 ctrl = i2c_readl(i2c, REG_CON); in rk3x_i2c_stop()
184 i2c_writel(i2c, ctrl, REG_CON); in rk3x_i2c_stop()
187 i2c->busy = false; in rk3x_i2c_stop()
188 i2c->state = STATE_IDLE; in rk3x_i2c_stop()
195 i2c_writel(i2c, 0, REG_CON); in rk3x_i2c_stop()
198 wake_up(&i2c->wait); in rk3x_i2c_stop()
205 static void rk3x_i2c_prepare_read(struct rk3x_i2c *i2c) in rk3x_i2c_prepare_read() argument
207 unsigned int len = i2c->msg->len - i2c->processed; in rk3x_i2c_prepare_read()
210 con = i2c_readl(i2c, REG_CON); in rk3x_i2c_prepare_read()
224 if (i2c->processed != 0) { in rk3x_i2c_prepare_read()
229 i2c_writel(i2c, con, REG_CON); in rk3x_i2c_prepare_read()
230 i2c_writel(i2c, len, REG_MRXCNT); in rk3x_i2c_prepare_read()
236 static void rk3x_i2c_fill_transmit_buf(struct rk3x_i2c *i2c) in rk3x_i2c_fill_transmit_buf() argument
246 if ((i2c->processed == i2c->msg->len) && (cnt != 0)) in rk3x_i2c_fill_transmit_buf()
249 if (i2c->processed == 0 && cnt == 0) in rk3x_i2c_fill_transmit_buf()
250 byte = (i2c->addr & 0x7f) << 1; in rk3x_i2c_fill_transmit_buf()
252 byte = i2c->msg->buf[i2c->processed++]; in rk3x_i2c_fill_transmit_buf()
258 i2c_writel(i2c, val, TXBUFFER_BASE + 4 * i); in rk3x_i2c_fill_transmit_buf()
260 if (i2c->processed == i2c->msg->len) in rk3x_i2c_fill_transmit_buf()
264 i2c_writel(i2c, cnt, REG_MTXCNT); in rk3x_i2c_fill_transmit_buf()
270 static void rk3x_i2c_handle_start(struct rk3x_i2c *i2c, unsigned int ipd) in rk3x_i2c_handle_start() argument
273 rk3x_i2c_stop(i2c, -EIO); in rk3x_i2c_handle_start()
274 dev_warn(i2c->dev, "unexpected irq in START: 0x%x\n", ipd); in rk3x_i2c_handle_start()
275 rk3x_i2c_clean_ipd(i2c); in rk3x_i2c_handle_start()
280 i2c_writel(i2c, REG_INT_START, REG_IPD); in rk3x_i2c_handle_start()
283 i2c_writel(i2c, i2c_readl(i2c, REG_CON) & ~REG_CON_START, REG_CON); in rk3x_i2c_handle_start()
286 if (i2c->mode == REG_CON_MOD_TX) { in rk3x_i2c_handle_start()
287 i2c_writel(i2c, REG_INT_MBTF | REG_INT_NAKRCV, REG_IEN); in rk3x_i2c_handle_start()
288 i2c->state = STATE_WRITE; in rk3x_i2c_handle_start()
289 rk3x_i2c_fill_transmit_buf(i2c); in rk3x_i2c_handle_start()
292 i2c_writel(i2c, REG_INT_MBRF | REG_INT_NAKRCV, REG_IEN); in rk3x_i2c_handle_start()
293 i2c->state = STATE_READ; in rk3x_i2c_handle_start()
294 rk3x_i2c_prepare_read(i2c); in rk3x_i2c_handle_start()
298 static void rk3x_i2c_handle_write(struct rk3x_i2c *i2c, unsigned int ipd) in rk3x_i2c_handle_write() argument
301 rk3x_i2c_stop(i2c, -EIO); in rk3x_i2c_handle_write()
302 dev_err(i2c->dev, "unexpected irq in WRITE: 0x%x\n", ipd); in rk3x_i2c_handle_write()
303 rk3x_i2c_clean_ipd(i2c); in rk3x_i2c_handle_write()
308 i2c_writel(i2c, REG_INT_MBTF, REG_IPD); in rk3x_i2c_handle_write()
311 if (i2c->processed == i2c->msg->len) in rk3x_i2c_handle_write()
312 rk3x_i2c_stop(i2c, i2c->error); in rk3x_i2c_handle_write()
314 rk3x_i2c_fill_transmit_buf(i2c); in rk3x_i2c_handle_write()
317 static void rk3x_i2c_handle_read(struct rk3x_i2c *i2c, unsigned int ipd) in rk3x_i2c_handle_read() argument
320 unsigned int len = i2c->msg->len - i2c->processed; in rk3x_i2c_handle_read()
329 i2c_writel(i2c, REG_INT_MBRF, REG_IPD); in rk3x_i2c_handle_read()
338 val = i2c_readl(i2c, RXBUFFER_BASE + (i / 4) * 4); in rk3x_i2c_handle_read()
341 i2c->msg->buf[i2c->processed++] = byte; in rk3x_i2c_handle_read()
345 if (i2c->processed == i2c->msg->len) in rk3x_i2c_handle_read()
346 rk3x_i2c_stop(i2c, i2c->error); in rk3x_i2c_handle_read()
348 rk3x_i2c_prepare_read(i2c); in rk3x_i2c_handle_read()
351 static void rk3x_i2c_handle_stop(struct rk3x_i2c *i2c, unsigned int ipd) in rk3x_i2c_handle_stop() argument
356 rk3x_i2c_stop(i2c, -EIO); in rk3x_i2c_handle_stop()
357 dev_err(i2c->dev, "unexpected irq in STOP: 0x%x\n", ipd); in rk3x_i2c_handle_stop()
358 rk3x_i2c_clean_ipd(i2c); in rk3x_i2c_handle_stop()
363 i2c_writel(i2c, REG_INT_STOP, REG_IPD); in rk3x_i2c_handle_stop()
366 con = i2c_readl(i2c, REG_CON); in rk3x_i2c_handle_stop()
368 i2c_writel(i2c, con, REG_CON); in rk3x_i2c_handle_stop()
370 i2c->busy = false; in rk3x_i2c_handle_stop()
371 i2c->state = STATE_IDLE; in rk3x_i2c_handle_stop()
374 wake_up(&i2c->wait); in rk3x_i2c_handle_stop()
379 struct rk3x_i2c *i2c = dev_id; in rk3x_i2c_irq() local
382 spin_lock(&i2c->lock); in rk3x_i2c_irq()
384 ipd = i2c_readl(i2c, REG_IPD); in rk3x_i2c_irq()
385 if (i2c->state == STATE_IDLE) { in rk3x_i2c_irq()
386 dev_warn(i2c->dev, "irq in STATE_IDLE, ipd = 0x%x\n", ipd); in rk3x_i2c_irq()
387 rk3x_i2c_clean_ipd(i2c); in rk3x_i2c_irq()
391 dev_dbg(i2c->dev, "IRQ: state %d, ipd: %x\n", i2c->state, ipd); in rk3x_i2c_irq()
402 i2c_writel(i2c, REG_INT_NAKRCV, REG_IPD); in rk3x_i2c_irq()
406 if (!(i2c->msg->flags & I2C_M_IGNORE_NAK)) in rk3x_i2c_irq()
407 rk3x_i2c_stop(i2c, -ENXIO); in rk3x_i2c_irq()
414 switch (i2c->state) { in rk3x_i2c_irq()
416 rk3x_i2c_handle_start(i2c, ipd); in rk3x_i2c_irq()
419 rk3x_i2c_handle_write(i2c, ipd); in rk3x_i2c_irq()
422 rk3x_i2c_handle_read(i2c, ipd); in rk3x_i2c_irq()
425 rk3x_i2c_handle_stop(i2c, ipd); in rk3x_i2c_irq()
432 spin_unlock(&i2c->lock); in rk3x_i2c_irq()
617 static void rk3x_i2c_adapt_div(struct rk3x_i2c *i2c, unsigned long clk_rate) in rk3x_i2c_adapt_div() argument
623 ret = rk3x_i2c_calc_divs(clk_rate, i2c->scl_frequency, i2c->scl_rise_ns, in rk3x_i2c_adapt_div()
624 i2c->scl_fall_ns, i2c->sda_fall_ns, in rk3x_i2c_adapt_div()
626 WARN_ONCE(ret != 0, "Could not reach SCL freq %u", i2c->scl_frequency); in rk3x_i2c_adapt_div()
628 clk_enable(i2c->clk); in rk3x_i2c_adapt_div()
629 i2c_writel(i2c, (div_high << 16) | (div_low & 0xffff), REG_CLKDIV); in rk3x_i2c_adapt_div()
630 clk_disable(i2c->clk); in rk3x_i2c_adapt_div()
634 dev_dbg(i2c->dev, in rk3x_i2c_adapt_div()
637 1000000000 / i2c->scl_frequency, in rk3x_i2c_adapt_div()
662 struct rk3x_i2c *i2c = container_of(nb, struct rk3x_i2c, clk_rate_nb); in rk3x_i2c_clk_notifier_cb() local
667 if (rk3x_i2c_calc_divs(ndata->new_rate, i2c->scl_frequency, in rk3x_i2c_clk_notifier_cb()
668 i2c->scl_rise_ns, i2c->scl_fall_ns, in rk3x_i2c_clk_notifier_cb()
669 i2c->sda_fall_ns, in rk3x_i2c_clk_notifier_cb()
675 rk3x_i2c_adapt_div(i2c, ndata->new_rate); in rk3x_i2c_clk_notifier_cb()
681 rk3x_i2c_adapt_div(i2c, ndata->new_rate); in rk3x_i2c_clk_notifier_cb()
686 rk3x_i2c_adapt_div(i2c, ndata->old_rate); in rk3x_i2c_clk_notifier_cb()
703 static int rk3x_i2c_setup(struct rk3x_i2c *i2c, struct i2c_msg *msgs, int num) in rk3x_i2c_setup() argument
720 dev_dbg(i2c->dev, "Combined write/read from addr 0x%x\n", in rk3x_i2c_setup()
730 i2c->msg = &msgs[1]; in rk3x_i2c_setup()
732 i2c->mode = REG_CON_MOD_REGISTER_TX; in rk3x_i2c_setup()
734 i2c_writel(i2c, addr | REG_MRXADDR_VALID(0), REG_MRXADDR); in rk3x_i2c_setup()
735 i2c_writel(i2c, reg_addr, REG_MRXRADDR); in rk3x_i2c_setup()
751 i2c->mode = REG_CON_MOD_REGISTER_TX; in rk3x_i2c_setup()
752 i2c_writel(i2c, addr | REG_MRXADDR_VALID(0), in rk3x_i2c_setup()
754 i2c_writel(i2c, 0, REG_MRXRADDR); in rk3x_i2c_setup()
756 i2c->mode = REG_CON_MOD_TX; in rk3x_i2c_setup()
759 i2c->msg = &msgs[0]; in rk3x_i2c_setup()
764 i2c->addr = msgs[0].addr; in rk3x_i2c_setup()
765 i2c->busy = true; in rk3x_i2c_setup()
766 i2c->state = STATE_START; in rk3x_i2c_setup()
767 i2c->processed = 0; in rk3x_i2c_setup()
768 i2c->error = 0; in rk3x_i2c_setup()
770 rk3x_i2c_clean_ipd(i2c); in rk3x_i2c_setup()
778 struct rk3x_i2c *i2c = (struct rk3x_i2c *)adap->algo_data; in rk3x_i2c_xfer() local
783 spin_lock_irqsave(&i2c->lock, flags); in rk3x_i2c_xfer()
785 clk_enable(i2c->clk); in rk3x_i2c_xfer()
787 i2c->is_last_msg = false; in rk3x_i2c_xfer()
794 ret = rk3x_i2c_setup(i2c, msgs + i, num - i); in rk3x_i2c_xfer()
797 dev_err(i2c->dev, "rk3x_i2c_setup() failed\n"); in rk3x_i2c_xfer()
802 i2c->is_last_msg = true; in rk3x_i2c_xfer()
804 spin_unlock_irqrestore(&i2c->lock, flags); in rk3x_i2c_xfer()
806 rk3x_i2c_start(i2c); in rk3x_i2c_xfer()
808 timeout = wait_event_timeout(i2c->wait, !i2c->busy, in rk3x_i2c_xfer()
811 spin_lock_irqsave(&i2c->lock, flags); in rk3x_i2c_xfer()
814 dev_err(i2c->dev, "timeout, ipd: 0x%02x, state: %d\n", in rk3x_i2c_xfer()
815 i2c_readl(i2c, REG_IPD), i2c->state); in rk3x_i2c_xfer()
818 i2c_writel(i2c, 0, REG_IEN); in rk3x_i2c_xfer()
819 i2c_writel(i2c, REG_CON_EN | REG_CON_STOP, REG_CON); in rk3x_i2c_xfer()
821 i2c->state = STATE_IDLE; in rk3x_i2c_xfer()
827 if (i2c->error) { in rk3x_i2c_xfer()
828 ret = i2c->error; in rk3x_i2c_xfer()
833 clk_disable(i2c->clk); in rk3x_i2c_xfer()
834 spin_unlock_irqrestore(&i2c->lock, flags); in rk3x_i2c_xfer()
867 struct rk3x_i2c *i2c; in rk3x_i2c_probe() local
875 i2c = devm_kzalloc(&pdev->dev, sizeof(struct rk3x_i2c), GFP_KERNEL); in rk3x_i2c_probe()
876 if (!i2c) in rk3x_i2c_probe()
880 i2c->soc_data = (struct rk3x_i2c_soc_data *)match->data; in rk3x_i2c_probe()
883 &i2c->scl_frequency)) { in rk3x_i2c_probe()
886 i2c->scl_frequency = DEFAULT_SCL_RATE; in rk3x_i2c_probe()
889 if (i2c->scl_frequency == 0 || i2c->scl_frequency > 400 * 1000) { in rk3x_i2c_probe()
893 i2c->scl_frequency = DEFAULT_SCL_RATE; in rk3x_i2c_probe()
901 &i2c->scl_rise_ns)) { in rk3x_i2c_probe()
902 if (i2c->scl_frequency <= 100000) in rk3x_i2c_probe()
903 i2c->scl_rise_ns = 1000; in rk3x_i2c_probe()
905 i2c->scl_rise_ns = 300; in rk3x_i2c_probe()
908 &i2c->scl_fall_ns)) in rk3x_i2c_probe()
909 i2c->scl_fall_ns = 300; in rk3x_i2c_probe()
911 &i2c->sda_fall_ns)) in rk3x_i2c_probe()
912 i2c->sda_fall_ns = i2c->scl_fall_ns; in rk3x_i2c_probe()
914 strlcpy(i2c->adap.name, "rk3x-i2c", sizeof(i2c->adap.name)); in rk3x_i2c_probe()
915 i2c->adap.owner = THIS_MODULE; in rk3x_i2c_probe()
916 i2c->adap.algo = &rk3x_i2c_algorithm; in rk3x_i2c_probe()
917 i2c->adap.retries = 3; in rk3x_i2c_probe()
918 i2c->adap.dev.of_node = np; in rk3x_i2c_probe()
919 i2c->adap.algo_data = i2c; in rk3x_i2c_probe()
920 i2c->adap.dev.parent = &pdev->dev; in rk3x_i2c_probe()
922 i2c->dev = &pdev->dev; in rk3x_i2c_probe()
924 spin_lock_init(&i2c->lock); in rk3x_i2c_probe()
925 init_waitqueue_head(&i2c->wait); in rk3x_i2c_probe()
927 i2c->clk = devm_clk_get(&pdev->dev, NULL); in rk3x_i2c_probe()
928 if (IS_ERR(i2c->clk)) { in rk3x_i2c_probe()
930 return PTR_ERR(i2c->clk); in rk3x_i2c_probe()
934 i2c->regs = devm_ioremap_resource(&pdev->dev, mem); in rk3x_i2c_probe()
935 if (IS_ERR(i2c->regs)) in rk3x_i2c_probe()
936 return PTR_ERR(i2c->regs); in rk3x_i2c_probe()
945 if (i2c->soc_data->grf_offset >= 0) { in rk3x_i2c_probe()
963 ret = regmap_write(grf, i2c->soc_data->grf_offset, value); in rk3x_i2c_probe()
965 dev_err(i2c->dev, "Could not write to GRF: %d\n", ret); in rk3x_i2c_probe()
978 0, dev_name(&pdev->dev), i2c); in rk3x_i2c_probe()
984 platform_set_drvdata(pdev, i2c); in rk3x_i2c_probe()
986 ret = clk_prepare(i2c->clk); in rk3x_i2c_probe()
992 i2c->clk_rate_nb.notifier_call = rk3x_i2c_clk_notifier_cb; in rk3x_i2c_probe()
993 ret = clk_notifier_register(i2c->clk, &i2c->clk_rate_nb); in rk3x_i2c_probe()
999 clk_rate = clk_get_rate(i2c->clk); in rk3x_i2c_probe()
1000 rk3x_i2c_adapt_div(i2c, clk_rate); in rk3x_i2c_probe()
1002 ret = i2c_add_adapter(&i2c->adap); in rk3x_i2c_probe()
1008 dev_info(&pdev->dev, "Initialized RK3xxx I2C bus at %p\n", i2c->regs); in rk3x_i2c_probe()
1013 clk_notifier_unregister(i2c->clk, &i2c->clk_rate_nb); in rk3x_i2c_probe()
1015 clk_unprepare(i2c->clk); in rk3x_i2c_probe()
1021 struct rk3x_i2c *i2c = platform_get_drvdata(pdev); in rk3x_i2c_remove() local
1023 i2c_del_adapter(&i2c->adap); in rk3x_i2c_remove()
1025 clk_notifier_unregister(i2c->clk, &i2c->clk_rate_nb); in rk3x_i2c_remove()
1026 clk_unprepare(i2c->clk); in rk3x_i2c_remove()