Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 368 insertions, 0 deletions

diff --git a/drivers/spi/spi-mpc52xx-psc.c b/drivers/spi/spi-mpc52xx-psc.c
new file mode 100644
index 0000000000..795c08594a
--- /dev/null
+++ b/drivers/spi/spi-mpc52xx-psc.c
@@ -0,0 +1,368 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * MPC52xx PSC in SPI mode driver.
+ *
+ * Maintainer: Dragos Carp
+ *
+ * Copyright (C) 2006 TOPTICA Photonics AG.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/workqueue.h>
+#include <linux/completion.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/spi/spi.h>
+#include <linux/slab.h>
+
+#include <asm/mpc52xx.h>
+#include <asm/mpc52xx_psc.h>
+
+#define MCLK 20000000 /* PSC port MClk in hz */
+
+struct mpc52xx_psc_spi {
+	/* driver internal data */
+	struct mpc52xx_psc __iomem *psc;
+	struct mpc52xx_psc_fifo __iomem *fifo;
+	int irq;
+	u8 bits_per_word;
+
+	struct completion done;
+};
+
+/* controller state */
+struct mpc52xx_psc_spi_cs {
+	int bits_per_word;
+	int speed_hz;
+};
+
+/* set clock freq, clock ramp, bits per work
+ * if t is NULL then reset the values to the default values
+ */
+static int mpc52xx_psc_spi_transfer_setup(struct spi_device *spi,
+		struct spi_transfer *t)
+{
+	struct mpc52xx_psc_spi_cs *cs = spi->controller_state;
+
+	cs->speed_hz = (t && t->speed_hz)
+			? t->speed_hz : spi->max_speed_hz;
+	cs->bits_per_word = (t && t->bits_per_word)
+			? t->bits_per_word : spi->bits_per_word;
+	cs->bits_per_word = ((cs->bits_per_word + 7) / 8) * 8;
+	return 0;
+}
+
+static void mpc52xx_psc_spi_activate_cs(struct spi_device *spi)
+{
+	struct mpc52xx_psc_spi_cs *cs = spi->controller_state;
+	struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
+	struct mpc52xx_psc __iomem *psc = mps->psc;
+	u32 sicr;
+	u16 ccr;
+
+	sicr = in_be32(&psc->sicr);
+
+	/* Set clock phase and polarity */
+	if (spi->mode & SPI_CPHA)
+		sicr |= 0x00001000;
+	else
+		sicr &= ~0x00001000;
+	if (spi->mode & SPI_CPOL)
+		sicr |= 0x00002000;
+	else
+		sicr &= ~0x00002000;
+
+	if (spi->mode & SPI_LSB_FIRST)
+		sicr |= 0x10000000;
+	else
+		sicr &= ~0x10000000;
+	out_be32(&psc->sicr, sicr);
+
+	/* Set clock frequency and bits per word
+	 * Because psc->ccr is defined as 16bit register instead of 32bit
+	 * just set the lower byte of BitClkDiv
+	 */
+	ccr = in_be16((u16 __iomem *)&psc->ccr);
+	ccr &= 0xFF00;
+	if (cs->speed_hz)
+		ccr |= (MCLK / cs->speed_hz - 1) & 0xFF;
+	else /* by default SPI Clk 1MHz */
+		ccr |= (MCLK / 1000000 - 1) & 0xFF;
+	out_be16((u16 __iomem *)&psc->ccr, ccr);
+	mps->bits_per_word = cs->bits_per_word;
+}
+
+#define MPC52xx_PSC_BUFSIZE (MPC52xx_PSC_RFNUM_MASK + 1)
+/* wake up when 80% fifo full */
+#define MPC52xx_PSC_RFALARM (MPC52xx_PSC_BUFSIZE * 20 / 100)
+
+static int mpc52xx_psc_spi_transfer_rxtx(struct spi_device *spi,
+						struct spi_transfer *t)
+{
+	struct mpc52xx_psc_spi *mps = spi_master_get_devdata(spi->master);
+	struct mpc52xx_psc __iomem *psc = mps->psc;
+	struct mpc52xx_psc_fifo __iomem *fifo = mps->fifo;
+	unsigned rb = 0;	/* number of bytes receieved */
+	unsigned sb = 0;	/* number of bytes sent */
+	unsigned char *rx_buf = (unsigned char *)t->rx_buf;
+	unsigned char *tx_buf = (unsigned char *)t->tx_buf;
+	unsigned rfalarm;
+	unsigned send_at_once = MPC52xx_PSC_BUFSIZE;
+	unsigned recv_at_once;
+	int last_block = 0;
+
+	if (!t->tx_buf && !t->rx_buf && t->len)
+		return -EINVAL;
+
+	/* enable transmiter/receiver */
+	out_8(&psc->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
+	while (rb < t->len) {
+		if (t->len - rb > MPC52xx_PSC_BUFSIZE) {
+			rfalarm = MPC52xx_PSC_RFALARM;
+			last_block = 0;
+		} else {
+			send_at_once = t->len - sb;
+			rfalarm = MPC52xx_PSC_BUFSIZE - (t->len - rb);
+			last_block = 1;
+		}
+
+		dev_dbg(&spi->dev, "send %d bytes...\n", send_at_once);
+		for (; send_at_once; sb++, send_at_once--) {
+			/* set EOF flag before the last word is sent */
+			if (send_at_once == 1 && last_block)
+				out_8(&psc->ircr2, 0x01);
+
+			if (tx_buf)
+				out_8(&psc->mpc52xx_psc_buffer_8, tx_buf[sb]);
+			else
+				out_8(&psc->mpc52xx_psc_buffer_8, 0);
+		}
+
+
+		/* enable interrupts and wait for wake up
+		 * if just one byte is expected the Rx FIFO genererates no
+		 * FFULL interrupt, so activate the RxRDY interrupt
+		 */
+		out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
+		if (t->len - rb == 1) {
+			out_8(&psc->mode, 0);
+		} else {
+			out_8(&psc->mode, MPC52xx_PSC_MODE_FFULL);
+			out_be16(&fifo->rfalarm, rfalarm);
+		}
+		out_be16(&psc->mpc52xx_psc_imr, MPC52xx_PSC_IMR_RXRDY);
+		wait_for_completion(&mps->done);
+		recv_at_once = in_be16(&fifo->rfnum);
+		dev_dbg(&spi->dev, "%d bytes received\n", recv_at_once);
+
+		send_at_once = recv_at_once;
+		if (rx_buf) {
+			for (; recv_at_once; rb++, recv_at_once--)
+				rx_buf[rb] = in_8(&psc->mpc52xx_psc_buffer_8);
+		} else {
+			for (; recv_at_once; rb++, recv_at_once--)
+				in_8(&psc->mpc52xx_psc_buffer_8);
+		}
+	}
+	/* disable transmiter/receiver */
+	out_8(&psc->command, MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE);
+
+	return 0;
+}
+
+int mpc52xx_psc_spi_transfer_one_message(struct spi_controller *ctlr,
+					 struct spi_message *m)
+{
+	struct spi_device *spi;
+	struct spi_transfer *t = NULL;
+	unsigned cs_change;
+	int status;
+
+	spi = m->spi;
+	cs_change = 1;
+	status = 0;
+	list_for_each_entry (t, &m->transfers, transfer_list) {
+		if (t->bits_per_word || t->speed_hz) {
+			status = mpc52xx_psc_spi_transfer_setup(spi, t);
+			if (status < 0)
+				break;
+		}
+
+		if (cs_change)
+			mpc52xx_psc_spi_activate_cs(spi);
+		cs_change = t->cs_change;
+
+		status = mpc52xx_psc_spi_transfer_rxtx(spi, t);
+		if (status)
+			break;
+		m->actual_length += t->len;
+
+		spi_transfer_delay_exec(t);
+	}
+
+	m->status = status;
+
+	mpc52xx_psc_spi_transfer_setup(spi, NULL);
+
+	spi_finalize_current_message(ctlr);
+
+	return 0;
+}
+
+static int mpc52xx_psc_spi_setup(struct spi_device *spi)
+{
+	struct mpc52xx_psc_spi_cs *cs = spi->controller_state;
+
+	if (spi->bits_per_word%8)
+		return -EINVAL;
+
+	if (!cs) {
+		cs = kzalloc(sizeof(*cs), GFP_KERNEL);
+		if (!cs)
+			return -ENOMEM;
+		spi->controller_state = cs;
+	}
+
+	cs->bits_per_word = spi->bits_per_word;
+	cs->speed_hz = spi->max_speed_hz;
+
+	return 0;
+}
+
+static void mpc52xx_psc_spi_cleanup(struct spi_device *spi)
+{
+	kfree(spi->controller_state);
+}
+
+static int mpc52xx_psc_spi_port_config(int psc_id, struct mpc52xx_psc_spi *mps)
+{
+	struct mpc52xx_psc __iomem *psc = mps->psc;
+	struct mpc52xx_psc_fifo __iomem *fifo = mps->fifo;
+	u32 mclken_div;
+	int ret;
+
+	/* default sysclk is 512MHz */
+	mclken_div = 512000000 / MCLK;
+	ret = mpc52xx_set_psc_clkdiv(psc_id, mclken_div);
+	if (ret)
+		return ret;
+
+	/* Reset the PSC into a known state */
+	out_8(&psc->command, MPC52xx_PSC_RST_RX);
+	out_8(&psc->command, MPC52xx_PSC_RST_TX);
+	out_8(&psc->command, MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE);
+
+	/* Disable interrupts, interrupts are based on alarm level */
+	out_be16(&psc->mpc52xx_psc_imr, 0);
+	out_8(&psc->command, MPC52xx_PSC_SEL_MODE_REG_1);
+	out_8(&fifo->rfcntl, 0);
+	out_8(&psc->mode, MPC52xx_PSC_MODE_FFULL);
+
+	/* Configure 8bit codec mode as a SPI master and use EOF flags */
+	/* SICR_SIM_CODEC8|SICR_GENCLK|SICR_SPI|SICR_MSTR|SICR_USEEOF */
+	out_be32(&psc->sicr, 0x0180C800);
+	out_be16((u16 __iomem *)&psc->ccr, 0x070F); /* default SPI Clk 1MHz */
+
+	/* Set 2ms DTL delay */
+	out_8(&psc->ctur, 0x00);
+	out_8(&psc->ctlr, 0x84);
+
+	mps->bits_per_word = 8;
+
+	return 0;
+}
+
+static irqreturn_t mpc52xx_psc_spi_isr(int irq, void *dev_id)
+{
+	struct mpc52xx_psc_spi *mps = (struct mpc52xx_psc_spi *)dev_id;
+	struct mpc52xx_psc __iomem *psc = mps->psc;
+
+	/* disable interrupt and wake up the work queue */
+	if (in_be16(&psc->mpc52xx_psc_isr) & MPC52xx_PSC_IMR_RXRDY) {
+		out_be16(&psc->mpc52xx_psc_imr, 0);
+		complete(&mps->done);
+		return IRQ_HANDLED;
+	}
+	return IRQ_NONE;
+}
+
+static int mpc52xx_psc_spi_of_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct mpc52xx_psc_spi *mps;
+	struct spi_master *master;
+	u32 bus_num;
+	int ret;
+
+	master = devm_spi_alloc_master(dev, sizeof(*mps));
+	if (master == NULL)
+		return -ENOMEM;
+
+	dev_set_drvdata(dev, master);
+	mps = spi_master_get_devdata(master);
+
+	/* the spi->mode bits understood by this driver: */
+	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LSB_FIRST;
+
+	ret = device_property_read_u32(dev, "cell-index", &bus_num);
+	if (ret || bus_num > 5)
+		return dev_err_probe(dev, ret ? : -EINVAL, "Invalid cell-index property\n");
+	master->bus_num = bus_num + 1;
+
+	master->num_chipselect = 255;
+	master->setup = mpc52xx_psc_spi_setup;
+	master->transfer_one_message = mpc52xx_psc_spi_transfer_one_message;
+	master->cleanup = mpc52xx_psc_spi_cleanup;
+
+	device_set_node(&master->dev, dev_fwnode(dev));
+
+	mps->psc = devm_platform_get_and_ioremap_resource(pdev, 0, NULL);
+	if (IS_ERR(mps->psc))
+		return dev_err_probe(dev, PTR_ERR(mps->psc), "could not ioremap I/O port range\n");
+
+	/* On the 5200, fifo regs are immediately ajacent to the psc regs */
+	mps->fifo = ((void __iomem *)mps->psc) + sizeof(struct mpc52xx_psc);
+
+	mps->irq = platform_get_irq(pdev, 0);
+	if (mps->irq < 0)
+		return mps->irq;
+
+	ret = devm_request_irq(dev, mps->irq, mpc52xx_psc_spi_isr, 0,
+			       "mpc52xx-psc-spi", mps);
+	if (ret)
+		return ret;
+
+	ret = mpc52xx_psc_spi_port_config(master->bus_num, mps);
+	if (ret < 0)
+		return dev_err_probe(dev, ret, "can't configure PSC! Is it capable of SPI?\n");
+
+	init_completion(&mps->done);
+
+	return devm_spi_register_master(dev, master);
+}
+
+static const struct of_device_id mpc52xx_psc_spi_of_match[] = {
+	{ .compatible = "fsl,mpc5200-psc-spi", },
+	{ .compatible = "mpc5200-psc-spi", }, /* old */
+	{}
+};
+
+MODULE_DEVICE_TABLE(of, mpc52xx_psc_spi_of_match);
+
+static struct platform_driver mpc52xx_psc_spi_of_driver = {
+	.probe = mpc52xx_psc_spi_of_probe,
+	.driver = {
+		.name = "mpc52xx-psc-spi",
+		.of_match_table = mpc52xx_psc_spi_of_match,
+	},
+};
+module_platform_driver(mpc52xx_psc_spi_of_driver);
+
+MODULE_AUTHOR("Dragos Carp");
+MODULE_DESCRIPTION("MPC52xx PSC SPI Driver");
+MODULE_LICENSE("GPL");