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Diffstat (limited to 'target/linux/ramips/patches-3.18/0061-SPI-ralink-add-mt7621-SoC-spi-driver.patch')
-rw-r--r--target/linux/ramips/patches-3.18/0061-SPI-ralink-add-mt7621-SoC-spi-driver.patch508
1 files changed, 508 insertions, 0 deletions
diff --git a/target/linux/ramips/patches-3.18/0061-SPI-ralink-add-mt7621-SoC-spi-driver.patch b/target/linux/ramips/patches-3.18/0061-SPI-ralink-add-mt7621-SoC-spi-driver.patch
new file mode 100644
index 0000000..5aa119e
--- /dev/null
+++ b/target/linux/ramips/patches-3.18/0061-SPI-ralink-add-mt7621-SoC-spi-driver.patch
@@ -0,0 +1,508 @@
+--- a/drivers/spi/Kconfig
++++ b/drivers/spi/Kconfig
+@@ -439,6 +439,12 @@ 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
+@@ -46,6 +46,7 @@ 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 +1,480 @@
++/*
++ * 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 MT7621_SPI_DATA4 0x18
++#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 MT7621_CPHA BIT(5)
++#define MT7621_CPOL BIT(4)
++#define MT7621_LSB_FIRST BIT(3)
++
++#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_reset(struct mt7621_spi *rs, int duplex)
++{
++ u32 master = mt7621_spi_read(rs, MT7621_SPI_MASTER);
++
++ master |= 7 << 29;
++ master |= 1 << 2;
++ if (duplex)
++ master |= 1 << 10;
++ else
++ master &= ~(1 << 10);
++
++ mt7621_spi_write(rs, MT7621_SPI_MASTER, master);
++}
++
++static void mt7621_spi_set_cs(struct spi_device *spi, int enable)
++{
++ struct mt7621_spi *rs = spidev_to_mt7621_spi(spi);
++ int cs = spi->chip_select;
++ u32 polar = 0;
++
++ mt7621_spi_reset(rs, cs);
++ if (enable)
++ polar = BIT(cs);
++ mt7621_spi_write(rs, MT7621_SPI_POLAR, polar);
++}
++
++static int mt7621_spi_prepare(struct spi_device *spi, unsigned int speed)
++{
++ struct mt7621_spi *rs = spidev_to_mt7621_spi(spi);
++ u32 rate;
++ u32 reg;
++
++ dev_dbg(&spi->dev, "speed:%u\n", speed);
++
++ rate = DIV_ROUND_UP(rs->sys_freq, speed);
++ dev_dbg(&spi->dev, "rate-1:%u\n", rate);
++
++ if (rate > 4097)
++ return -EINVAL;
++
++ if (rate < 2)
++ rate = 2;
++
++ reg = mt7621_spi_read(rs, MT7621_SPI_MASTER);
++ reg &= ~(0xfff << 16);
++ reg |= (rate - 2) << 16;
++ rs->speed = speed;
++
++ reg &= ~MT7621_LSB_FIRST;
++ if (spi->mode & SPI_LSB_FIRST)
++ reg |= MT7621_LSB_FIRST;
++
++ reg &= ~(MT7621_CPHA | MT7621_CPOL);
++ switch(spi->mode & (SPI_CPOL | SPI_CPHA)) {
++ case SPI_MODE_0:
++ break;
++ case SPI_MODE_1:
++ reg |= MT7621_CPHA;
++ break;
++ case SPI_MODE_2:
++ reg |= MT7621_CPOL;
++ break;
++ case SPI_MODE_3:
++ reg |= MT7621_CPOL | MT7621_CPHA;
++ break;
++ }
++ mt7621_spi_write(rs, MT7621_SPI_MASTER, reg);
++
++ return 0;
++}
++
++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_half_duplex(struct spi_master *master,
++ struct spi_message *m)
++{
++ struct mt7621_spi *rs = spi_master_get_devdata(master);
++ struct spi_device *spi = m->spi;
++ unsigned int speed = spi->max_speed_hz;
++ 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;
++ }
++
++ if (mt7621_spi_prepare(spi, speed)) {
++ 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_transfer_full_duplex(struct spi_master *master,
++ struct spi_message *m)
++{
++ struct mt7621_spi *rs = spi_master_get_devdata(master);
++ struct spi_device *spi = m->spi;
++ unsigned int speed = spi->max_speed_hz;
++ struct spi_transfer *t = NULL;
++ int status = 0;
++ int i, len = 0;
++ int rx_len = 0;
++ u32 data[9] = { 0 };
++ u32 val = 0;
++
++ 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 > 16)) {
++ status = -EIO;
++ goto msg_done;
++ }
++
++ for (i = 0; i < t->len; i++, len++)
++ data[len / 4] |= buf[i] << (8 * (len & 3));
++ if (speed > t->speed_hz)
++ speed = t->speed_hz;
++ }
++
++ if (WARN_ON(rx_len > 16)) {
++ status = -EIO;
++ goto msg_done;
++ }
++
++ if (mt7621_spi_prepare(spi, speed)) {
++ status = -EIO;
++ goto msg_done;
++ }
++
++ for (i = 0; i < len; i += 4)
++ mt7621_spi_write(rs, MT7621_SPI_DATA0 + i, data[i / 4]);
++
++ val |= len * 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_DATA4 + i);
++
++ m->actual_length = 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_transfer_one_message(struct spi_master *master,
++ struct spi_message *m)
++{
++ struct spi_device *spi = m->spi;
++ int cs = spi->chip_select;
++
++ if (cs)
++ return mt7621_spi_transfer_full_duplex(master, m);
++ return mt7621_spi_transfer_half_duplex(master, m);
++}
++
++static int mt7621_spi_setup(struct spi_device *spi)
++{
++ struct mt7621_spi *rs = spidev_to_mt7621_spi(spi);
++
++ if ((spi->max_speed_hz == 0) ||
++ (spi->max_speed_hz > (rs->sys_freq / 2)))
++ spi->max_speed_hz = (rs->sys_freq / 2);
++
++ if (spi->max_speed_hz < (rs->sys_freq / 4097)) {
++ dev_err(&spi->dev, "setup: requested speed is too low %d Hz\n",
++ spi->max_speed_hz);
++ return -EINVAL;
++ }
++
++ return 0;
++}
++
++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_info(&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 = 2;
++
++ 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_info(&pdev->dev, "sys_freq: %u\n", rs->sys_freq);
++ spin_lock_irqsave(&rs->lock, flags);
++
++ device_reset(&pdev->dev);
++
++ mt7621_spi_reset(rs, 0);
++
++ 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");
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