+++ /dev/null
---- a/drivers/spi/Kconfig
-+++ b/drivers/spi/Kconfig
-@@ -396,6 +396,12 @@ config SPI_RT2880
- help
- This selects a driver for the Ralink RT288x/RT305x SPI Controller.
-
-+config SPI_MT7621
-+ tristate "MediaTek MT7621 SPI Controller"
-+ depends on RALINK
-+ help
-+ This selects a driver for the MediaTek MT7621 SPI Controller.
-+
- config SPI_S3C24XX
- tristate "Samsung S3C24XX series SPI"
- depends on ARCH_S3C24XX
---- a/drivers/spi/Makefile
-+++ b/drivers/spi/Makefile
-@@ -44,6 +44,7 @@ obj-$(CONFIG_SPI_LM70_LLP) += spi-lm70l
- obj-$(CONFIG_SPI_MPC512x_PSC) += spi-mpc512x-psc.o
- obj-$(CONFIG_SPI_MPC52xx_PSC) += spi-mpc52xx-psc.o
- obj-$(CONFIG_SPI_MPC52xx) += spi-mpc52xx.o
-+obj-$(CONFIG_SPI_MT7621) += spi-mt7621.o
- obj-$(CONFIG_SPI_MXS) += spi-mxs.o
- obj-$(CONFIG_SPI_NUC900) += spi-nuc900.o
- obj-$(CONFIG_SPI_OC_TINY) += spi-oc-tiny.o
---- /dev/null
-+++ b/drivers/spi/spi-mt7621.c
-@@ -0,0 +1,315 @@
-+/*
-+ * spi-mt7621.c -- MediaTek MT7621 SPI controller driver
-+ *
-+ * Copyright (C) 2011 Sergiy <piratfm@gmail.com>
-+ * Copyright (C) 2011-2013 Gabor Juhos <juhosg@openwrt.org>
-+ * Copyright (C) 2014-2015 Felix Fietkau <nbd@openwrt.org>
-+ *
-+ * Some parts are based on spi-orion.c:
-+ * Author: Shadi Ammouri <shadi@marvell.com>
-+ * Copyright (C) 2007-2008 Marvell Ltd.
-+ *
-+ * This program is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License version 2 as
-+ * published by the Free Software Foundation.
-+ */
-+
-+#include <linux/init.h>
-+#include <linux/module.h>
-+#include <linux/clk.h>
-+#include <linux/err.h>
-+#include <linux/delay.h>
-+#include <linux/io.h>
-+#include <linux/reset.h>
-+#include <linux/spi/spi.h>
-+#include <linux/of_device.h>
-+#include <linux/platform_device.h>
-+#include <linux/swab.h>
-+
-+#include <ralink_regs.h>
-+
-+#define SPI_BPW_MASK(bits) BIT((bits) - 1)
-+
-+#define DRIVER_NAME "spi-mt7621"
-+/* in usec */
-+#define RALINK_SPI_WAIT_MAX_LOOP 2000
-+
-+/* SPISTAT register bit field */
-+#define SPISTAT_BUSY BIT(0)
-+
-+#define MT7621_SPI_TRANS 0x00
-+#define SPITRANS_BUSY BIT(16)
-+
-+#define MT7621_SPI_OPCODE 0x04
-+#define MT7621_SPI_DATA0 0x08
-+#define SPI_CTL_TX_RX_CNT_MASK 0xff
-+#define SPI_CTL_START BIT(8)
-+
-+#define MT7621_SPI_POLAR 0x38
-+#define MT7621_SPI_MASTER 0x28
-+#define MT7621_SPI_MOREBUF 0x2c
-+#define MT7621_SPI_SPACE 0x3c
-+
-+#define RT2880_SPI_MODE_BITS (SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST | SPI_CS_HIGH)
-+
-+struct mt7621_spi;
-+
-+struct mt7621_spi {
-+ struct spi_master *master;
-+ void __iomem *base;
-+ unsigned int sys_freq;
-+ unsigned int speed;
-+ struct clk *clk;
-+ spinlock_t lock;
-+
-+ struct mt7621_spi_ops *ops;
-+};
-+
-+static inline struct mt7621_spi *spidev_to_mt7621_spi(struct spi_device *spi)
-+{
-+ return spi_master_get_devdata(spi->master);
-+}
-+
-+static inline u32 mt7621_spi_read(struct mt7621_spi *rs, u32 reg)
-+{
-+ return ioread32(rs->base + reg);
-+}
-+
-+static inline void mt7621_spi_write(struct mt7621_spi *rs, u32 reg, u32 val)
-+{
-+ iowrite32(val, rs->base + reg);
-+}
-+
-+static void mt7621_spi_set_cs(struct spi_device *spi, int enable)
-+{
-+ struct mt7621_spi *rs = spidev_to_mt7621_spi(spi);
-+ u32 polar = mt7621_spi_read(rs, MT7621_SPI_POLAR);
-+
-+ if (enable)
-+ polar |= 1;
-+ else
-+ polar &= ~1;
-+ mt7621_spi_write(rs, MT7621_SPI_POLAR, polar);
-+}
-+
-+static inline int mt7621_spi_wait_till_ready(struct spi_device *spi)
-+{
-+ struct mt7621_spi *rs = spidev_to_mt7621_spi(spi);
-+ int i;
-+
-+ for (i = 0; i < RALINK_SPI_WAIT_MAX_LOOP; i++) {
-+ u32 status;
-+
-+ status = mt7621_spi_read(rs, MT7621_SPI_TRANS);
-+ if ((status & SPITRANS_BUSY) == 0) {
-+ return 0;
-+ }
-+ cpu_relax();
-+ udelay(1);
-+ }
-+
-+ return -ETIMEDOUT;
-+}
-+
-+static int mt7621_spi_transfer_one_message(struct spi_master *master,
-+ struct spi_message *m)
-+{
-+ struct mt7621_spi *rs = spi_master_get_devdata(master);
-+ struct spi_device *spi = m->spi;
-+ struct spi_transfer *t = NULL;
-+ int status = 0;
-+ int i, len = 0;
-+ int rx_len = 0;
-+ u32 data[9] = { 0 };
-+ u32 val;
-+
-+ mt7621_spi_wait_till_ready(spi);
-+
-+ list_for_each_entry(t, &m->transfers, transfer_list) {
-+ const u8 *buf = t->tx_buf;
-+
-+ if (t->rx_buf)
-+ rx_len += t->len;
-+
-+ if (!buf)
-+ continue;
-+
-+ if (WARN_ON(len + t->len > 36)) {
-+ status = -EIO;
-+ goto msg_done;
-+ }
-+
-+ for (i = 0; i < t->len; i++, len++)
-+ data[len / 4] |= buf[i] << (8 * (len & 3));
-+ }
-+
-+ if (WARN_ON(rx_len > 32)) {
-+ status = -EIO;
-+ goto msg_done;
-+ }
-+
-+ data[0] = swab32(data[0]);
-+ if (len < 4)
-+ data[0] >>= (4 - len) * 8;
-+
-+ for (i = 0; i < len; i += 4)
-+ mt7621_spi_write(rs, MT7621_SPI_OPCODE + i, data[i / 4]);
-+
-+ val = (min_t(int, len, 4) * 8) << 24;
-+ if (len > 4)
-+ val |= (len - 4) * 8;
-+ val |= (rx_len * 8) << 12;
-+ mt7621_spi_write(rs, MT7621_SPI_MOREBUF, val);
-+
-+ mt7621_spi_set_cs(spi, 1);
-+
-+ val = mt7621_spi_read(rs, MT7621_SPI_TRANS);
-+ val |= SPI_CTL_START;
-+ mt7621_spi_write(rs, MT7621_SPI_TRANS, val);
-+
-+ mt7621_spi_wait_till_ready(spi);
-+
-+ mt7621_spi_set_cs(spi, 0);
-+
-+ for (i = 0; i < rx_len; i += 4)
-+ data[i / 4] = mt7621_spi_read(rs, MT7621_SPI_DATA0 + i);
-+
-+ m->actual_length = len + rx_len;
-+
-+ len = 0;
-+ list_for_each_entry(t, &m->transfers, transfer_list) {
-+ u8 *buf = t->rx_buf;
-+
-+ if (!buf)
-+ continue;
-+
-+ for (i = 0; i < t->len; i++, len++)
-+ buf[i] = data[len / 4] >> (8 * (len & 3));
-+ }
-+
-+msg_done:
-+ m->status = status;
-+ spi_finalize_current_message(master);
-+
-+ return 0;
-+}
-+
-+static int mt7621_spi_setup(struct spi_device *spi)
-+{
-+ return 0;
-+}
-+
-+static void mt7621_spi_reset(struct mt7621_spi *rs)
-+{
-+ u32 master = mt7621_spi_read(rs, MT7621_SPI_MASTER);
-+
-+ master &= ~(0xfff << 16);
-+ master |= 13 << 16;
-+ master |= 7 << 29;
-+ master |= 1 << 2;
-+
-+ mt7621_spi_write(rs, MT7621_SPI_MASTER, master);
-+}
-+
-+static const struct of_device_id mt7621_spi_match[] = {
-+ { .compatible = "ralink,mt7621-spi" },
-+ {},
-+};
-+MODULE_DEVICE_TABLE(of, mt7621_spi_match);
-+
-+static int mt7621_spi_probe(struct platform_device *pdev)
-+{
-+ const struct of_device_id *match;
-+ struct spi_master *master;
-+ struct mt7621_spi *rs;
-+ unsigned long flags;
-+ void __iomem *base;
-+ struct resource *r;
-+ int status = 0;
-+ struct clk *clk;
-+ struct mt7621_spi_ops *ops;
-+
-+ match = of_match_device(mt7621_spi_match, &pdev->dev);
-+ if (!match)
-+ return -EINVAL;
-+ ops = (struct mt7621_spi_ops *)match->data;
-+
-+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-+ base = devm_ioremap_resource(&pdev->dev, r);
-+ if (IS_ERR(base))
-+ return PTR_ERR(base);
-+
-+ clk = devm_clk_get(&pdev->dev, NULL);
-+ if (IS_ERR(clk)) {
-+ dev_err(&pdev->dev, "unable to get SYS clock, err=%d\n",
-+ status);
-+ return PTR_ERR(clk);
-+ }
-+
-+ status = clk_prepare_enable(clk);
-+ if (status)
-+ return status;
-+
-+ master = spi_alloc_master(&pdev->dev, sizeof(*rs));
-+ if (master == NULL) {
-+ dev_dbg(&pdev->dev, "master allocation failed\n");
-+ return -ENOMEM;
-+ }
-+
-+ master->mode_bits = RT2880_SPI_MODE_BITS;
-+
-+ master->setup = mt7621_spi_setup;
-+ master->transfer_one_message = mt7621_spi_transfer_one_message;
-+ master->bits_per_word_mask = SPI_BPW_MASK(8);
-+ master->dev.of_node = pdev->dev.of_node;
-+ master->num_chipselect = 1;
-+
-+ dev_set_drvdata(&pdev->dev, master);
-+
-+ rs = spi_master_get_devdata(master);
-+ rs->base = base;
-+ rs->clk = clk;
-+ rs->master = master;
-+ rs->sys_freq = clk_get_rate(rs->clk);
-+ rs->ops = ops;
-+ dev_dbg(&pdev->dev, "sys_freq: %u\n", rs->sys_freq);
-+ spin_lock_irqsave(&rs->lock, flags);
-+
-+ device_reset(&pdev->dev);
-+
-+ mt7621_spi_reset(rs);
-+
-+ return spi_register_master(master);
-+}
-+
-+static int mt7621_spi_remove(struct platform_device *pdev)
-+{
-+ struct spi_master *master;
-+ struct mt7621_spi *rs;
-+
-+ master = dev_get_drvdata(&pdev->dev);
-+ rs = spi_master_get_devdata(master);
-+
-+ clk_disable(rs->clk);
-+ spi_unregister_master(master);
-+
-+ return 0;
-+}
-+
-+MODULE_ALIAS("platform:" DRIVER_NAME);
-+
-+static struct platform_driver mt7621_spi_driver = {
-+ .driver = {
-+ .name = DRIVER_NAME,
-+ .owner = THIS_MODULE,
-+ .of_match_table = mt7621_spi_match,
-+ },
-+ .probe = mt7621_spi_probe,
-+ .remove = mt7621_spi_remove,
-+};
-+
-+module_platform_driver(mt7621_spi_driver);
-+
-+MODULE_DESCRIPTION("MT7621 SPI driver");
-+MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
-+MODULE_LICENSE("GPL");
projects / openwrt / svn-archive / archive.git / blobdiff