2  * Driver for Amlogic Meson SPI flash controller (SPIFC)
62 #define USER_UC_MASK		((BIT(5) - 1) << 27)
78  * @clk:	input clock of the built-in baud rate generator
96  * meson_spifc_wait_ready() - wait for the current operation to terminate
97  * @spifc:	the Meson SPI device
100 static int meson_spifc_wait_ready(struct meson_spifc *spifc)  in meson_spifc_wait_ready()  argument
106 		regmap_read(spifc->regmap, REG_SLAVE, &data);  in meson_spifc_wait_ready()
112 	return -ETIMEDOUT;  in meson_spifc_wait_ready()
116  * meson_spifc_drain_buffer() - copy data from device buffer to memory
117  * @spifc:	the Meson SPI device
121 static void meson_spifc_drain_buffer(struct meson_spifc *spifc, u8 *buf,  in meson_spifc_drain_buffer()  argument
128 		regmap_read(spifc->regmap, REG_C0 + i, &data);  in meson_spifc_drain_buffer()
130 		if (len - i >= 4) {  in meson_spifc_drain_buffer()
134 			memcpy(buf, &data, len - i);  in meson_spifc_drain_buffer()
142  * meson_spifc_fill_buffer() - copy data from memory to device buffer
143  * @spifc:	the Meson SPI device
147 static void meson_spifc_fill_buffer(struct meson_spifc *spifc, const u8 *buf,  in meson_spifc_fill_buffer()  argument
154 		if (len - i >= 4)  in meson_spifc_fill_buffer()
157 			memcpy(&data, buf, len - i);  in meson_spifc_fill_buffer()
159 		regmap_write(spifc->regmap, REG_C0 + i, data);  in meson_spifc_fill_buffer()
167  * meson_spifc_setup_speed() - program the clock divider
168  * @spifc:	the Meson SPI device
171 static void meson_spifc_setup_speed(struct meson_spifc *spifc, u32 speed)  in meson_spifc_setup_speed()  argument
176 	parent = clk_get_rate(spifc->clk);  in meson_spifc_setup_speed()
177 	n = max_t(int, parent / speed - 1, 1);  in meson_spifc_setup_speed()
179 	dev_dbg(spifc->dev, "parent %lu, speed %u, n %d\n", parent,  in meson_spifc_setup_speed()
184 	value |= (((n + 1) / 2 - 1) << CLOCK_CNT_HIGH_SHIFT) &  in meson_spifc_setup_speed()
187 	regmap_write(spifc->regmap, REG_CLOCK, value);  in meson_spifc_setup_speed()
191  * meson_spifc_txrx() - transfer a chunk of data
192  * @spifc:	the Meson SPI device
200 static int meson_spifc_txrx(struct meson_spifc *spifc,  in meson_spifc_txrx()  argument
208 	if (xfer->tx_buf)  in meson_spifc_txrx()
209 		meson_spifc_fill_buffer(spifc, xfer->tx_buf + offset, len);  in meson_spifc_txrx()
212 	regmap_update_bits(spifc->regmap, REG_USER, USER_UC_MASK,  in meson_spifc_txrx()
214 	regmap_write(spifc->regmap, REG_USER1,  in meson_spifc_txrx()
215 		     (8 * len - 1) << USER1_BN_UC_DOUT_SHIFT);  in meson_spifc_txrx()
218 	regmap_update_bits(spifc->regmap, REG_USER, USER_DIN_EN_MS,  in meson_spifc_txrx()
223 			keep_cs = xfer->cs_change;  in meson_spifc_txrx()
225 			keep_cs = !xfer->cs_change;  in meson_spifc_txrx()
228 	regmap_update_bits(spifc->regmap, REG_USER4, USER4_CS_ACT,  in meson_spifc_txrx()
232 	regmap_update_bits(spifc->regmap, REG_SLAVE, SLAVE_TRST_DONE, 0);  in meson_spifc_txrx()
234 	regmap_update_bits(spifc->regmap, REG_CMD, CMD_USER, CMD_USER);  in meson_spifc_txrx()
236 	ret = meson_spifc_wait_ready(spifc);  in meson_spifc_txrx()
238 	if (!ret && xfer->rx_buf)  in meson_spifc_txrx()
239 		meson_spifc_drain_buffer(spifc, xfer->rx_buf + offset, len);  in meson_spifc_txrx()
245  * meson_spifc_transfer_one() - perform a single transfer
255 	struct meson_spifc *spifc = spi_master_get_devdata(master);  in meson_spifc_transfer_one()  local
258 	meson_spifc_setup_speed(spifc, xfer->speed_hz);  in meson_spifc_transfer_one()
260 	regmap_update_bits(spifc->regmap, REG_CTRL, CTRL_ENABLE_AHB, 0);  in meson_spifc_transfer_one()
262 	while (done < xfer->len && !ret) {  in meson_spifc_transfer_one()
263 		len = min_t(int, xfer->len - done, SPIFC_BUFFER_SIZE);  in meson_spifc_transfer_one()
264 		ret = meson_spifc_txrx(spifc, xfer, done, len,  in meson_spifc_transfer_one()
266 				       done + len >= xfer->len);  in meson_spifc_transfer_one()
270 	regmap_update_bits(spifc->regmap, REG_CTRL, CTRL_ENABLE_AHB,  in meson_spifc_transfer_one()
277  * meson_spifc_hw_init() - reset and initialize the SPI controller
278  * @spifc:	the Meson SPI device
280 static void meson_spifc_hw_init(struct meson_spifc *spifc)  in meson_spifc_hw_init()  argument
283 	regmap_update_bits(spifc->regmap, REG_SLAVE, SLAVE_SW_RST,  in meson_spifc_hw_init()
286 	regmap_update_bits(spifc->regmap, REG_USER, USER_CMP_MODE, 0);  in meson_spifc_hw_init()
288 	regmap_update_bits(spifc->regmap, REG_SLAVE, SLAVE_OP_MODE, 0);  in meson_spifc_hw_init()
294 	struct meson_spifc *spifc;  in meson_spifc_probe()  local
300 	master = spi_alloc_master(&pdev->dev, sizeof(struct meson_spifc));  in meson_spifc_probe()
302 		return -ENOMEM;  in meson_spifc_probe()
306 	spifc = spi_master_get_devdata(master);  in meson_spifc_probe()
307 	spifc->dev = &pdev->dev;  in meson_spifc_probe()
310 	base = devm_ioremap_resource(spifc->dev, res);  in meson_spifc_probe()
316 	spifc->regmap = devm_regmap_init_mmio(spifc->dev, base,  in meson_spifc_probe()
318 	if (IS_ERR(spifc->regmap)) {  in meson_spifc_probe()
319 		ret = PTR_ERR(spifc->regmap);  in meson_spifc_probe()
323 	spifc->clk = devm_clk_get(spifc->dev, NULL);  in meson_spifc_probe()
324 	if (IS_ERR(spifc->clk)) {  in meson_spifc_probe()
325 		dev_err(spifc->dev, "missing clock\n");  in meson_spifc_probe()
326 		ret = PTR_ERR(spifc->clk);  in meson_spifc_probe()
330 	ret = clk_prepare_enable(spifc->clk);  in meson_spifc_probe()
332 		dev_err(spifc->dev, "can't prepare clock\n");  in meson_spifc_probe()
336 	rate = clk_get_rate(spifc->clk);  in meson_spifc_probe()
338 	master->num_chipselect = 1;  in meson_spifc_probe()
339 	master->dev.of_node = pdev->dev.of_node;  in meson_spifc_probe()
340 	master->bits_per_word_mask = SPI_BPW_MASK(8);  in meson_spifc_probe()
341 	master->auto_runtime_pm = true;  in meson_spifc_probe()
342 	master->transfer_one = meson_spifc_transfer_one;  in meson_spifc_probe()
343 	master->min_speed_hz = rate >> 6;  in meson_spifc_probe()
344 	master->max_speed_hz = rate >> 1;  in meson_spifc_probe()
346 	meson_spifc_hw_init(spifc);  in meson_spifc_probe()
348 	pm_runtime_set_active(spifc->dev);  in meson_spifc_probe()
349 	pm_runtime_enable(spifc->dev);  in meson_spifc_probe()
351 	ret = devm_spi_register_master(spifc->dev, master);  in meson_spifc_probe()
353 		dev_err(spifc->dev, "failed to register spi master\n");  in meson_spifc_probe()
359 	clk_disable_unprepare(spifc->clk);  in meson_spifc_probe()
368 	struct meson_spifc *spifc = spi_master_get_devdata(master);  in meson_spifc_remove()  local
370 	pm_runtime_get_sync(&pdev->dev);  in meson_spifc_remove()
371 	clk_disable_unprepare(spifc->clk);  in meson_spifc_remove()
372 	pm_runtime_disable(&pdev->dev);  in meson_spifc_remove()
381 	struct meson_spifc *spifc = spi_master_get_devdata(master);  in meson_spifc_suspend()  local
389 		clk_disable_unprepare(spifc->clk);  in meson_spifc_suspend()
397 	struct meson_spifc *spifc = spi_master_get_devdata(master);  in meson_spifc_resume()  local
401 		ret = clk_prepare_enable(spifc->clk);  in meson_spifc_resume()
406 	meson_spifc_hw_init(spifc);  in meson_spifc_resume()
410 		clk_disable_unprepare(spifc->clk);  in meson_spifc_resume()
420 	struct meson_spifc *spifc = spi_master_get_devdata(master);  in meson_spifc_runtime_suspend()  local
422 	clk_disable_unprepare(spifc->clk);  in meson_spifc_runtime_suspend()
430 	struct meson_spifc *spifc = spi_master_get_devdata(master);  in meson_spifc_runtime_resume()  local
432 	return clk_prepare_enable(spifc->clk);  in meson_spifc_runtime_resume()
444 	{ .compatible = "amlogic,meson6-spifc", },
445 	{ .compatible = "amlogic,meson-gxbb-spifc", },
454 		.name		= "meson-spifc",
463 MODULE_DESCRIPTION("Amlogic Meson SPIFC driver");