diff options
Diffstat (limited to 'target/mips/mikrotik-rb4xx/patches/3.14.13/0006-spi-add-rb4xx-SPI-driver.patch')
-rw-r--r-- | target/mips/mikrotik-rb4xx/patches/3.14.13/0006-spi-add-rb4xx-SPI-driver.patch | 557 |
1 files changed, 557 insertions, 0 deletions
diff --git a/target/mips/mikrotik-rb4xx/patches/3.14.13/0006-spi-add-rb4xx-SPI-driver.patch b/target/mips/mikrotik-rb4xx/patches/3.14.13/0006-spi-add-rb4xx-SPI-driver.patch new file mode 100644 index 000000000..757dc775b --- /dev/null +++ b/target/mips/mikrotik-rb4xx/patches/3.14.13/0006-spi-add-rb4xx-SPI-driver.patch @@ -0,0 +1,557 @@ +From 97ffc04a7528abe1d84c069d99afb19704d50224 Mon Sep 17 00:00:00 2001 +From: Phil Sutter <phil@nwl.cc> +Date: Tue, 13 May 2014 00:18:58 +0200 +Subject: [PATCH] spi: add rb4xx SPI driver + +--- + drivers/spi/Kconfig | 6 + + drivers/spi/Makefile | 1 + + drivers/spi/spi-rb4xx.c | 507 ++++++++++++++++++++++++++++++++++++++++++++++++ + 3 files changed, 514 insertions(+) + create mode 100644 drivers/spi/spi-rb4xx.c + +diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig +index 581ee2a..721f3a7 100644 +--- a/drivers/spi/Kconfig ++++ b/drivers/spi/Kconfig +@@ -381,6 +381,12 @@ config SPI_RSPI + help + SPI driver for Renesas RSPI and QSPI blocks. + ++config SPI_RB4XX ++ tristate "Mikrotik RB4XX SPI master" ++ depends on SPI_MASTER && ATH79_MACH_RB4XX ++ help ++ SPI controller driver for the Mikrotik RB4xx series boards. ++ + config SPI_S3C24XX + tristate "Samsung S3C24XX series SPI" + depends on ARCH_S3C24XX +diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile +index 95af48d..e738c7a 100644 +--- a/drivers/spi/Makefile ++++ b/drivers/spi/Makefile +@@ -59,6 +59,7 @@ spi-pxa2xx-platform-$(CONFIG_SPI_PXA2XX_PXADMA) += spi-pxa2xx-pxadma.o + spi-pxa2xx-platform-$(CONFIG_SPI_PXA2XX_DMA) += spi-pxa2xx-dma.o + obj-$(CONFIG_SPI_PXA2XX) += spi-pxa2xx-platform.o + obj-$(CONFIG_SPI_PXA2XX_PCI) += spi-pxa2xx-pci.o ++obj-$(CONFIG_SPI_RB4XX) += spi-rb4xx.o + obj-$(CONFIG_SPI_RSPI) += spi-rspi.o + obj-$(CONFIG_SPI_S3C24XX) += spi-s3c24xx-hw.o + spi-s3c24xx-hw-y := spi-s3c24xx.o +diff --git a/drivers/spi/spi-rb4xx.c b/drivers/spi/spi-rb4xx.c +new file mode 100644 +index 0000000..56260ff +--- /dev/null ++++ b/drivers/spi/spi-rb4xx.c +@@ -0,0 +1,507 @@ ++/* ++ * SPI controller driver for the Mikrotik RB4xx boards ++ * ++ * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org> ++ * ++ * This file was based on the patches for Linux 2.6.27.39 published by ++ * MikroTik for their RouterBoard 4xx series devices. ++ * ++ * 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/clk.h> ++#include <linux/err.h> ++#include <linux/kernel.h> ++#include <linux/module.h> ++#include <linux/init.h> ++#include <linux/delay.h> ++#include <linux/spinlock.h> ++#include <linux/workqueue.h> ++#include <linux/platform_device.h> ++#include <linux/spi/spi.h> ++ ++#include <asm/mach-ath79/ar71xx_regs.h> ++#include <asm/mach-ath79/ath79.h> ++ ++#define DRV_NAME "rb4xx-spi" ++#define DRV_DESC "Mikrotik RB4xx SPI controller driver" ++#define DRV_VERSION "0.1.0" ++ ++#define SPI_CTRL_FASTEST 0x40 ++#define SPI_FLASH_HZ 33333334 ++#define SPI_CPLD_HZ 33333334 ++ ++#define CPLD_CMD_READ_FAST 0x0b ++ ++#undef RB4XX_SPI_DEBUG ++ ++struct rb4xx_spi { ++ void __iomem *base; ++ struct spi_master *master; ++ ++ unsigned spi_ctrl_flash; ++ unsigned spi_ctrl_fread; ++ ++ struct clk *ahb_clk; ++ unsigned long ahb_freq; ++ ++ spinlock_t lock; ++ struct list_head queue; ++ int busy:1; ++ int cs_wait; ++}; ++ ++static unsigned spi_clk_low = AR71XX_SPI_IOC_CS1; ++ ++#ifdef RB4XX_SPI_DEBUG ++static inline void do_spi_delay(void) ++{ ++ ndelay(20000); ++} ++#else ++static inline void do_spi_delay(void) { } ++#endif ++ ++static inline void do_spi_init(struct spi_device *spi) ++{ ++ unsigned cs = AR71XX_SPI_IOC_CS0 | AR71XX_SPI_IOC_CS1; ++ ++ if (!(spi->mode & SPI_CS_HIGH)) ++ cs ^= (spi->chip_select == 2) ? AR71XX_SPI_IOC_CS1 : ++ AR71XX_SPI_IOC_CS0; ++ ++ spi_clk_low = cs; ++} ++ ++static inline void do_spi_finish(void __iomem *base) ++{ ++ do_spi_delay(); ++ __raw_writel(AR71XX_SPI_IOC_CS0 | AR71XX_SPI_IOC_CS1, ++ base + AR71XX_SPI_REG_IOC); ++} ++ ++static inline void do_spi_clk(void __iomem *base, int bit) ++{ ++ unsigned bval = spi_clk_low | ((bit & 1) ? AR71XX_SPI_IOC_DO : 0); ++ ++ do_spi_delay(); ++ __raw_writel(bval, base + AR71XX_SPI_REG_IOC); ++ do_spi_delay(); ++ __raw_writel(bval | AR71XX_SPI_IOC_CLK, base + AR71XX_SPI_REG_IOC); ++} ++ ++static void do_spi_byte(void __iomem *base, unsigned char byte) ++{ ++ do_spi_clk(base, byte >> 7); ++ do_spi_clk(base, byte >> 6); ++ do_spi_clk(base, byte >> 5); ++ do_spi_clk(base, byte >> 4); ++ do_spi_clk(base, byte >> 3); ++ do_spi_clk(base, byte >> 2); ++ do_spi_clk(base, byte >> 1); ++ do_spi_clk(base, byte); ++ ++ pr_debug("spi_byte sent 0x%02x got 0x%02x\n", ++ (unsigned)byte, ++ (unsigned char)__raw_readl(base + AR71XX_SPI_REG_RDS)); ++} ++ ++static inline void do_spi_clk_fast(void __iomem *base, unsigned bit1, ++ unsigned bit2) ++{ ++ unsigned bval = (spi_clk_low | ++ ((bit1 & 1) ? AR71XX_SPI_IOC_DO : 0) | ++ ((bit2 & 1) ? AR71XX_SPI_IOC_CS2 : 0)); ++ do_spi_delay(); ++ __raw_writel(bval, base + AR71XX_SPI_REG_IOC); ++ do_spi_delay(); ++ __raw_writel(bval | AR71XX_SPI_IOC_CLK, base + AR71XX_SPI_REG_IOC); ++} ++ ++static void do_spi_byte_fast(void __iomem *base, unsigned char byte) ++{ ++ do_spi_clk_fast(base, byte >> 7, byte >> 6); ++ do_spi_clk_fast(base, byte >> 5, byte >> 4); ++ do_spi_clk_fast(base, byte >> 3, byte >> 2); ++ do_spi_clk_fast(base, byte >> 1, byte >> 0); ++ ++ pr_debug("spi_byte_fast sent 0x%02x got 0x%02x\n", ++ (unsigned)byte, ++ (unsigned char) __raw_readl(base + AR71XX_SPI_REG_RDS)); ++} ++ ++static int rb4xx_spi_txrx(void __iomem *base, struct spi_transfer *t) ++{ ++ const unsigned char *rxv_ptr = NULL; ++ const unsigned char *tx_ptr = t->tx_buf; ++ unsigned char *rx_ptr = t->rx_buf; ++ unsigned i; ++ ++ pr_debug("spi_txrx len %u tx %u rx %u\n", ++ t->len, ++ (t->tx_buf ? 1 : 0), ++ (t->rx_buf ? 1 : 0)); ++ ++ if (t->verify) { ++ rxv_ptr = tx_ptr; ++ tx_ptr = NULL; ++ } ++ ++ for (i = 0; i < t->len; ++i) { ++ unsigned char sdata = tx_ptr ? tx_ptr[i] : 0; ++ ++ if (t->fast_write) ++ do_spi_byte_fast(base, sdata); ++ else ++ do_spi_byte(base, sdata); ++ ++ if (rx_ptr) { ++ rx_ptr[i] = __raw_readl(base + AR71XX_SPI_REG_RDS) & 0xff; ++ } else if (rxv_ptr) { ++ unsigned char c = __raw_readl(base + AR71XX_SPI_REG_RDS); ++ if (rxv_ptr[i] != c) ++ return i; ++ } ++ } ++ ++ return i; ++} ++ ++static int rb4xx_spi_read_fast(struct rb4xx_spi *rbspi, ++ struct spi_message *m) ++{ ++ struct spi_transfer *t; ++ const unsigned char *tx_ptr; ++ unsigned addr; ++ void __iomem *base = rbspi->base; ++ ++ /* check for exactly two transfers */ ++ if (list_empty(&m->transfers) || ++ list_is_last(m->transfers.next, &m->transfers) || ++ !list_is_last(m->transfers.next->next, &m->transfers)) { ++ return -1; ++ } ++ ++ /* first transfer contains command and address */ ++ t = list_entry(m->transfers.next, ++ struct spi_transfer, transfer_list); ++ ++ if (t->len != 5 || t->tx_buf == NULL) ++ return -1; ++ ++ tx_ptr = t->tx_buf; ++ if (tx_ptr[0] != CPLD_CMD_READ_FAST) ++ return -1; ++ ++ addr = tx_ptr[1]; ++ addr = tx_ptr[2] | (addr << 8); ++ addr = tx_ptr[3] | (addr << 8); ++ addr += (unsigned) base; ++ ++ m->actual_length += t->len; ++ ++ /* second transfer contains data itself */ ++ t = list_entry(m->transfers.next->next, ++ struct spi_transfer, transfer_list); ++ ++ if (t->tx_buf && !t->verify) ++ return -1; ++ ++ __raw_writel(AR71XX_SPI_FS_GPIO, base + AR71XX_SPI_REG_FS); ++ __raw_writel(rbspi->spi_ctrl_fread, base + AR71XX_SPI_REG_CTRL); ++ __raw_writel(0, base + AR71XX_SPI_REG_FS); ++ ++ if (t->rx_buf) { ++ memcpy(t->rx_buf, (const void *)addr, t->len); ++ } else if (t->tx_buf) { ++ unsigned char buf[t->len]; ++ memcpy(buf, (const void *)addr, t->len); ++ if (memcmp(t->tx_buf, buf, t->len) != 0) ++ m->status = -EMSGSIZE; ++ } ++ m->actual_length += t->len; ++ ++ if (rbspi->spi_ctrl_flash != rbspi->spi_ctrl_fread) { ++ __raw_writel(AR71XX_SPI_FS_GPIO, base + AR71XX_SPI_REG_FS); ++ __raw_writel(rbspi->spi_ctrl_flash, base + AR71XX_SPI_REG_CTRL); ++ __raw_writel(0, base + AR71XX_SPI_REG_FS); ++ } ++ ++ return 0; ++} ++ ++static int rb4xx_spi_msg(struct rb4xx_spi *rbspi, struct spi_message *m) ++{ ++ struct spi_transfer *t = NULL; ++ void __iomem *base = rbspi->base; ++ ++ m->status = 0; ++ if (list_empty(&m->transfers)) ++ return -1; ++ ++ if (m->fast_read) ++ if (rb4xx_spi_read_fast(rbspi, m) == 0) ++ return -1; ++ ++ __raw_writel(AR71XX_SPI_FS_GPIO, base + AR71XX_SPI_REG_FS); ++ __raw_writel(SPI_CTRL_FASTEST, base + AR71XX_SPI_REG_CTRL); ++ do_spi_init(m->spi); ++ ++ list_for_each_entry(t, &m->transfers, transfer_list) { ++ int len; ++ ++ len = rb4xx_spi_txrx(base, t); ++ if (len != t->len) { ++ m->status = -EMSGSIZE; ++ break; ++ } ++ m->actual_length += len; ++ ++ if (t->cs_change) { ++ if (list_is_last(&t->transfer_list, &m->transfers)) { ++ /* wait for continuation */ ++ return m->spi->chip_select; ++ } ++ do_spi_finish(base); ++ ndelay(100); ++ } ++ } ++ ++ do_spi_finish(base); ++ __raw_writel(rbspi->spi_ctrl_flash, base + AR71XX_SPI_REG_CTRL); ++ __raw_writel(0, base + AR71XX_SPI_REG_FS); ++ return -1; ++} ++ ++static void rb4xx_spi_process_queue_locked(struct rb4xx_spi *rbspi, ++ unsigned long *flags) ++{ ++ int cs = rbspi->cs_wait; ++ ++ rbspi->busy = 1; ++ while (!list_empty(&rbspi->queue)) { ++ struct spi_message *m; ++ ++ list_for_each_entry(m, &rbspi->queue, queue) ++ if (cs < 0 || cs == m->spi->chip_select) ++ break; ++ ++ if (&m->queue == &rbspi->queue) ++ break; ++ ++ list_del_init(&m->queue); ++ spin_unlock_irqrestore(&rbspi->lock, *flags); ++ ++ cs = rb4xx_spi_msg(rbspi, m); ++ m->complete(m->context); ++ ++ spin_lock_irqsave(&rbspi->lock, *flags); ++ } ++ ++ rbspi->cs_wait = cs; ++ rbspi->busy = 0; ++ ++ if (cs >= 0) { ++ /* TODO: add timer to unlock cs after 1s inactivity */ ++ } ++} ++ ++static int rb4xx_spi_transfer(struct spi_device *spi, ++ struct spi_message *m) ++{ ++ struct rb4xx_spi *rbspi = spi_master_get_devdata(spi->master); ++ unsigned long flags; ++ ++ m->actual_length = 0; ++ m->status = -EINPROGRESS; ++ ++ spin_lock_irqsave(&rbspi->lock, flags); ++ list_add_tail(&m->queue, &rbspi->queue); ++ if (rbspi->busy || ++ (rbspi->cs_wait >= 0 && rbspi->cs_wait != m->spi->chip_select)) { ++ /* job will be done later */ ++ spin_unlock_irqrestore(&rbspi->lock, flags); ++ return 0; ++ } ++ ++ /* process job in current context */ ++ rb4xx_spi_process_queue_locked(rbspi, &flags); ++ spin_unlock_irqrestore(&rbspi->lock, flags); ++ ++ return 0; ++} ++ ++static int rb4xx_spi_setup(struct spi_device *spi) ++{ ++ struct rb4xx_spi *rbspi = spi_master_get_devdata(spi->master); ++ unsigned long flags; ++ ++ if (spi->mode & ~(SPI_CS_HIGH)) { ++ dev_err(&spi->dev, "mode %x not supported\n", ++ (unsigned) spi->mode); ++ return -EINVAL; ++ } ++ ++ if (spi->bits_per_word != 8 && spi->bits_per_word != 0) { ++ dev_err(&spi->dev, "bits_per_word %u not supported\n", ++ (unsigned) spi->bits_per_word); ++ return -EINVAL; ++ } ++ ++ spin_lock_irqsave(&rbspi->lock, flags); ++ if (rbspi->cs_wait == spi->chip_select && !rbspi->busy) { ++ rbspi->cs_wait = -1; ++ rb4xx_spi_process_queue_locked(rbspi, &flags); ++ } ++ spin_unlock_irqrestore(&rbspi->lock, flags); ++ ++ return 0; ++} ++ ++static unsigned get_spi_ctrl(struct rb4xx_spi *rbspi, unsigned hz_max, ++ const char *name) ++{ ++ unsigned div; ++ ++ div = (rbspi->ahb_freq - 1) / (2 * hz_max); ++ ++ /* ++ * CPU has a bug at (div == 0) - first bit read is random ++ */ ++ if (div == 0) ++ ++div; ++ ++ if (name) { ++ unsigned ahb_khz = (rbspi->ahb_freq + 500) / 1000; ++ unsigned div_real = 2 * (div + 1); ++ pr_debug("rb4xx: %s SPI clock %u kHz (AHB %u kHz / %u)\n", ++ name, ++ ahb_khz / div_real, ++ ahb_khz, div_real); ++ } ++ ++ return SPI_CTRL_FASTEST + div; ++} ++ ++static int rb4xx_spi_probe(struct platform_device *pdev) ++{ ++ struct spi_master *master; ++ struct rb4xx_spi *rbspi; ++ struct resource *r; ++ int err = 0; ++ ++ master = spi_alloc_master(&pdev->dev, sizeof(*rbspi)); ++ if (master == NULL) { ++ dev_err(&pdev->dev, "no memory for spi_master\n"); ++ err = -ENOMEM; ++ goto err_out; ++ } ++ ++ master->bus_num = 0; ++ master->num_chipselect = 3; ++ master->setup = rb4xx_spi_setup; ++ master->transfer = rb4xx_spi_transfer; ++ ++ rbspi = spi_master_get_devdata(master); ++ ++ rbspi->ahb_clk = clk_get(&pdev->dev, "ahb"); ++ if (IS_ERR(rbspi->ahb_clk)) { ++ err = PTR_ERR(rbspi->ahb_clk); ++ goto err_put_master; ++ } ++ ++ err = clk_enable(rbspi->ahb_clk); ++ if (err) ++ goto err_clk_put; ++ ++ rbspi->ahb_freq = clk_get_rate(rbspi->ahb_clk); ++ if (!rbspi->ahb_freq) { ++ err = -EINVAL; ++ goto err_clk_disable; ++ } ++ ++ platform_set_drvdata(pdev, rbspi); ++ ++ r = platform_get_resource(pdev, IORESOURCE_MEM, 0); ++ if (r == NULL) { ++ err = -ENOENT; ++ goto err_clk_disable; ++ } ++ ++ rbspi->base = ioremap(r->start, r->end - r->start + 1); ++ if (!rbspi->base) { ++ err = -ENXIO; ++ goto err_clk_disable; ++ } ++ ++ rbspi->master = master; ++ rbspi->spi_ctrl_flash = get_spi_ctrl(rbspi, SPI_FLASH_HZ, "FLASH"); ++ rbspi->spi_ctrl_fread = get_spi_ctrl(rbspi, SPI_CPLD_HZ, "CPLD"); ++ rbspi->cs_wait = -1; ++ ++ spin_lock_init(&rbspi->lock); ++ INIT_LIST_HEAD(&rbspi->queue); ++ ++ err = spi_register_master(master); ++ if (err) { ++ dev_err(&pdev->dev, "failed to register SPI master\n"); ++ goto err_iounmap; ++ } ++ ++ return 0; ++ ++err_iounmap: ++ iounmap(rbspi->base); ++err_clk_disable: ++ clk_disable(rbspi->ahb_clk); ++err_clk_put: ++ clk_put(rbspi->ahb_clk); ++err_put_master: ++ platform_set_drvdata(pdev, NULL); ++ spi_master_put(master); ++err_out: ++ return err; ++} ++ ++static int rb4xx_spi_remove(struct platform_device *pdev) ++{ ++ struct rb4xx_spi *rbspi = platform_get_drvdata(pdev); ++ ++ iounmap(rbspi->base); ++ clk_disable(rbspi->ahb_clk); ++ clk_put(rbspi->ahb_clk); ++ platform_set_drvdata(pdev, NULL); ++ spi_master_put(rbspi->master); ++ ++ return 0; ++} ++ ++static struct platform_driver rb4xx_spi_drv = { ++ .probe = rb4xx_spi_probe, ++ .remove = rb4xx_spi_remove, ++ .driver = { ++ .name = DRV_NAME, ++ .owner = THIS_MODULE, ++ }, ++}; ++ ++static int __init rb4xx_spi_init(void) ++{ ++ return platform_driver_register(&rb4xx_spi_drv); ++} ++subsys_initcall(rb4xx_spi_init); ++ ++static void __exit rb4xx_spi_exit(void) ++{ ++ platform_driver_unregister(&rb4xx_spi_drv); ++} ++ ++module_exit(rb4xx_spi_exit); ++ ++MODULE_DESCRIPTION(DRV_DESC); ++MODULE_VERSION(DRV_VERSION); ++MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>"); ++MODULE_LICENSE("GPL v2"); +-- +1.8.5.3 + |