From 96027ac290d0fcc0dbf5c5aa5030b2db843d99f7 Mon Sep 17 00:00:00 2001 From: Felix Fietkau Date: Fri, 2 Jan 2015 21:52:53 +0000 Subject: ramips: split mt7621 spi into a separate driver, increase maximum transfer size Signed-off-by: Felix Fietkau git-svn-id: svn://svn.openwrt.org/openwrt/trunk@43807 3c298f89-4303-0410-b956-a3cf2f4a3e73 --- ...0061-SPI-ralink-add-mt7621-SoC-spi-driver.patch | 343 +++++++++++++++++++++ 1 file changed, 343 insertions(+) create mode 100644 target/linux/ramips/patches-3.14/0061-SPI-ralink-add-mt7621-SoC-spi-driver.patch (limited to 'target/linux/ramips/patches-3.14/0061-SPI-ralink-add-mt7621-SoC-spi-driver.patch') diff --git a/target/linux/ramips/patches-3.14/0061-SPI-ralink-add-mt7621-SoC-spi-driver.patch b/target/linux/ramips/patches-3.14/0061-SPI-ralink-add-mt7621-SoC-spi-driver.patch new file mode 100644 index 0000000000..4b46603bf2 --- /dev/null +++ b/target/linux/ramips/patches-3.14/0061-SPI-ralink-add-mt7621-SoC-spi-driver.patch @@ -0,0 +1,343 @@ +--- 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 ++ * Copyright (C) 2011-2013 Gabor Juhos ++ * Copyright (C) 2014-2015 Felix Fietkau ++ * ++ * Some parts are based on spi-orion.c: ++ * Author: Shadi Ammouri ++ * 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 ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++ ++#include ++ ++#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 "); ++MODULE_LICENSE("GPL"); -- cgit v1.2.3