--- /dev/null
+From 0ebdb2202a06d096114aa7676f02d5f426a20366 Mon Sep 17 00:00:00 2001
+From: John Crispin <blogic@openwrt.org>
+Date: Sat, 27 Aug 2011 18:12:26 +0200
+Subject: [PATCH 39/70] SPI: MIPS: lantiq: add FALC-ON spi driver
+
+The external bus unit (EBU) found on the FALC-ON SoC has spi emulation that is
+designed for serial flash access. This driver has only been tested with m25p80
+type chips. The hardware has no support for other types of spi peripherals.
+
+Signed-off-by: Thomas Langer <thomas.langer@lantiq.com>
+Signed-off-by: John Crispin <blogic@openwrt.org>
+Cc: spi-devel-general@lists.sourceforge.net
+---
+ arch/mips/lantiq/falcon/devices.c | 13 +
+ arch/mips/lantiq/falcon/devices.h | 4 +
+ arch/mips/lantiq/falcon/mach-easy98000.c | 27 ++
+ drivers/spi/Kconfig | 4 +
+ drivers/spi/Makefile | 1 +
+ drivers/spi/spi-falcon.c | 483 ++++++++++++++++++++++++++++++
+ 6 files changed, 532 insertions(+), 0 deletions(-)
+ create mode 100644 drivers/spi/spi-falcon.c
+
+diff --git a/arch/mips/lantiq/falcon/devices.c b/arch/mips/lantiq/falcon/devices.c
+index 6cd7a88..92ec571 100644
+--- a/arch/mips/lantiq/falcon/devices.c
++++ b/arch/mips/lantiq/falcon/devices.c
+@@ -121,3 +121,16 @@ falcon_register_gpio_extra(void)
+ platform_device_register_simple("falcon_gpio", 4,
+ falcon_gpio4_res, ARRAY_SIZE(falcon_gpio4_res));
+ }
++
++/* spi flash */
++static struct platform_device ltq_spi = {
++ .name = "falcon_spi",
++ .num_resources = 0,
++};
++
++void __init
++falcon_register_spi_flash(struct spi_board_info *data)
++{
++ spi_register_board_info(data, 1);
++ platform_device_register(<q_spi);
++}
+diff --git a/arch/mips/lantiq/falcon/devices.h b/arch/mips/lantiq/falcon/devices.h
+index 18be8b6..5e6f720 100644
+--- a/arch/mips/lantiq/falcon/devices.h
++++ b/arch/mips/lantiq/falcon/devices.h
+@@ -11,10 +11,14 @@
+ #ifndef _FALCON_DEVICES_H__
+ #define _FALCON_DEVICES_H__
+
++#include <linux/spi/spi.h>
++#include <linux/spi/flash.h>
++
+ #include "../devices.h"
+
+ extern void falcon_register_nand(void);
+ extern void falcon_register_gpio(void);
+ extern void falcon_register_gpio_extra(void);
++extern void falcon_register_spi_flash(struct spi_board_info *data);
+
+ #endif
+diff --git a/arch/mips/lantiq/falcon/mach-easy98000.c b/arch/mips/lantiq/falcon/mach-easy98000.c
+index 361b8f0..1a7caad 100644
+--- a/arch/mips/lantiq/falcon/mach-easy98000.c
++++ b/arch/mips/lantiq/falcon/mach-easy98000.c
+@@ -40,6 +40,21 @@ struct physmap_flash_data easy98000_nor_flash_data = {
+ .parts = easy98000_nor_partitions,
+ };
+
++static struct flash_platform_data easy98000_spi_flash_platform_data = {
++ .name = "sflash",
++ .parts = easy98000_nor_partitions,
++ .nr_parts = ARRAY_SIZE(easy98000_nor_partitions)
++};
++
++static struct spi_board_info easy98000_spi_flash_data __initdata = {
++ .modalias = "m25p80",
++ .bus_num = 0,
++ .chip_select = 0,
++ .max_speed_hz = 10 * 1000 * 1000,
++ .mode = SPI_MODE_3,
++ .platform_data = &easy98000_spi_flash_platform_data
++};
++
+ /* setup gpio based spi bus/device for access to the eeprom on the board */
+ #define SPI_GPIO_MRST 102
+ #define SPI_GPIO_MTSR 103
+@@ -93,6 +108,13 @@ easy98000_init(void)
+ }
+
+ static void __init
++easy98000sf_init(void)
++{
++ easy98000_init_common();
++ falcon_register_spi_flash(&easy98000_spi_flash_data);
++}
++
++static void __init
+ easy98000nand_init(void)
+ {
+ easy98000_init_common();
+@@ -104,6 +126,11 @@ MIPS_MACHINE(LANTIQ_MACH_EASY98000,
+ "EASY98000 Eval Board",
+ easy98000_init);
+
++MIPS_MACHINE(LANTIQ_MACH_EASY98000SF,
++ "EASY98000SF",
++ "EASY98000 Eval Board (Serial Flash)",
++ easy98000sf_init);
++
+ MIPS_MACHINE(LANTIQ_MACH_EASY98000NAND,
+ "EASY98000NAND",
+ "EASY98000 Eval Board (NAND Flash)",
+diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
+index 8ba4510..b8424ba 100644
+--- a/drivers/spi/Kconfig
++++ b/drivers/spi/Kconfig
+@@ -180,6 +180,10 @@ config SPI_MPC52xx
+ This drivers supports the MPC52xx SPI controller in master SPI
+ mode.
+
++config SPI_FALCON
++ tristate "Falcon SPI controller support"
++ depends on SOC_FALCON
++
+ config SPI_MPC52xx_PSC
+ tristate "Freescale MPC52xx PSC SPI controller"
+ depends on PPC_MPC52xx && EXPERIMENTAL
+diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
+index 61c3261..570894c 100644
+--- a/drivers/spi/Makefile
++++ b/drivers/spi/Makefile
+@@ -25,6 +25,7 @@ obj-$(CONFIG_SPI_DW_MMIO) += spi-dw-mmio.o
+ obj-$(CONFIG_SPI_DW_PCI) += spi-dw-midpci.o
+ spi-dw-midpci-objs := spi-dw-pci.o spi-dw-mid.o
+ obj-$(CONFIG_SPI_EP93XX) += spi-ep93xx.o
++obj-$(CONFIG_SPI_FALCON) += spi-falcon.o
+ obj-$(CONFIG_SPI_FSL_LIB) += spi-fsl-lib.o
+ obj-$(CONFIG_SPI_FSL_ESPI) += spi-fsl-espi.o
+ obj-$(CONFIG_SPI_FSL_SPI) += spi-fsl-spi.o
+diff --git a/drivers/spi/spi-falcon.c b/drivers/spi/spi-falcon.c
+new file mode 100644
+index 0000000..447bbaa
+--- /dev/null
++++ b/drivers/spi/spi-falcon.c
+@@ -0,0 +1,483 @@
++/*
++ * 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.
++ *
++ * Copyright (C) 2010 Thomas Langer <thomas.langer@lantiq.com>
++ */
++
++#include <linux/module.h>
++#include <linux/device.h>
++#include <linux/platform_device.h>
++#include <linux/spi/spi.h>
++#include <linux/delay.h>
++#include <linux/workqueue.h>
++
++#include <lantiq_soc.h>
++
++#define DRV_NAME "falcon_spi"
++
++#define FALCON_SPI_XFER_BEGIN (1 << 0)
++#define FALCON_SPI_XFER_END (1 << 1)
++
++/* Bus Read Configuration Register0 */
++#define LTQ_BUSRCON0 0x00000010
++/* Bus Write Configuration Register0 */
++#define LTQ_BUSWCON0 0x00000018
++/* Serial Flash Configuration Register */
++#define LTQ_SFCON 0x00000080
++/* Serial Flash Time Register */
++#define LTQ_SFTIME 0x00000084
++/* Serial Flash Status Register */
++#define LTQ_SFSTAT 0x00000088
++/* Serial Flash Command Register */
++#define LTQ_SFCMD 0x0000008C
++/* Serial Flash Address Register */
++#define LTQ_SFADDR 0x00000090
++/* Serial Flash Data Register */
++#define LTQ_SFDATA 0x00000094
++/* Serial Flash I/O Control Register */
++#define LTQ_SFIO 0x00000098
++/* EBU Clock Control Register */
++#define LTQ_EBUCC 0x000000C4
++
++/* Dummy Phase Length */
++#define SFCMD_DUMLEN_OFFSET 16
++#define SFCMD_DUMLEN_MASK 0x000F0000
++/* Chip Select */
++#define SFCMD_CS_OFFSET 24
++#define SFCMD_CS_MASK 0x07000000
++/* field offset */
++#define SFCMD_ALEN_OFFSET 20
++#define SFCMD_ALEN_MASK 0x00700000
++/* SCK Rise-edge Position */
++#define SFTIME_SCKR_POS_OFFSET 8
++#define SFTIME_SCKR_POS_MASK 0x00000F00
++/* SCK Period */
++#define SFTIME_SCK_PER_OFFSET 0
++#define SFTIME_SCK_PER_MASK 0x0000000F
++/* SCK Fall-edge Position */
++#define SFTIME_SCKF_POS_OFFSET 12
++#define SFTIME_SCKF_POS_MASK 0x0000F000
++/* Device Size */
++#define SFCON_DEV_SIZE_A23_0 0x03000000
++#define SFCON_DEV_SIZE_MASK 0x0F000000
++/* Read Data Position */
++#define SFTIME_RD_POS_MASK 0x000F0000
++/* Data Output */
++#define SFIO_UNUSED_WD_MASK 0x0000000F
++/* Command Opcode mask */
++#define SFCMD_OPC_MASK 0x000000FF
++/* dlen bytes of data to write */
++#define SFCMD_DIR_WRITE 0x00000100
++/* Data Length offset */
++#define SFCMD_DLEN_OFFSET 9
++/* Command Error */
++#define SFSTAT_CMD_ERR 0x20000000
++/* Access Command Pending */
++#define SFSTAT_CMD_PEND 0x00400000
++/* Frequency set to 100MHz. */
++#define EBUCC_EBUDIV_SELF100 0x00000001
++/* Serial Flash */
++#define BUSRCON0_AGEN_SERIAL_FLASH 0xF0000000
++/* 8-bit multiplexed */
++#define BUSRCON0_PORTW_8_BIT_MUX 0x00000000
++/* Serial Flash */
++#define BUSWCON0_AGEN_SERIAL_FLASH 0xF0000000
++/* Chip Select after opcode */
++#define SFCMD_KEEP_CS_KEEP_SELECTED 0x00008000
++
++struct falcon_spi {
++ u32 sfcmd; /* for caching of opcode, direction, ... */
++ struct spi_master *master;
++};
++
++int
++falcon_spi_xfer(struct spi_device *spi,
++ struct spi_transfer *t,
++ unsigned long flags)
++{
++ struct device *dev = &spi->dev;
++ struct falcon_spi *priv = spi_master_get_devdata(spi->master);
++ const u8 *txp = t->tx_buf;
++ u8 *rxp = t->rx_buf;
++ unsigned int bytelen = ((8 * t->len + 7) / 8);
++ unsigned int len, alen, dumlen;
++ u32 val;
++ enum {
++ state_init,
++ state_command_prepare,
++ state_write,
++ state_read,
++ state_disable_cs,
++ state_end
++ } state = state_init;
++
++ do {
++ switch (state) {
++ case state_init: /* detect phase of upper layer sequence */
++ {
++ /* initial write ? */
++ if (flags & FALCON_SPI_XFER_BEGIN) {
++ if (!txp) {
++ dev_err(dev,
++ "BEGIN without tx data!\n");
++ return -1;
++ }
++ /*
++ * Prepare the parts of the sfcmd register,
++ * which should not
++ * change during a sequence!
++ * Only exception are the length fields,
++ * especially alen and dumlen.
++ */
++
++ priv->sfcmd = ((spi->chip_select
++ << SFCMD_CS_OFFSET)
++ & SFCMD_CS_MASK);
++ priv->sfcmd |= SFCMD_KEEP_CS_KEEP_SELECTED;
++ priv->sfcmd |= *txp;
++ txp++;
++ bytelen--;
++ if (bytelen) {
++ /*
++ * more data:
++ * maybe address and/or dummy
++ */
++ state = state_command_prepare;
++ break;
++ } else {
++ dev_dbg(dev, "write cmd %02X\n",
++ priv->sfcmd & SFCMD_OPC_MASK);
++ }
++ }
++ /* continued write ? */
++ if (txp && bytelen) {
++ state = state_write;
++ break;
++ }
++ /* read data? */
++ if (rxp && bytelen) {
++ state = state_read;
++ break;
++ }
++ /* end of sequence? */
++ if (flags & FALCON_SPI_XFER_END)
++ state = state_disable_cs;
++ else
++ state = state_end;
++ break;
++ }
++ /* collect tx data for address and dummy phase */
++ case state_command_prepare:
++ {
++ /* txp is valid, already checked */
++ val = 0;
++ alen = 0;
++ dumlen = 0;
++ while (bytelen > 0) {
++ if (alen < 3) {
++ val = (val<<8)|(*txp++);
++ alen++;
++ } else if ((dumlen < 15) && (*txp == 0)) {
++ /*
++ * assume dummy bytes are set to 0
++ * from upper layer
++ */
++ dumlen++;
++ txp++;
++ } else
++ break;
++ bytelen--;
++ }
++ priv->sfcmd &= ~(SFCMD_ALEN_MASK | SFCMD_DUMLEN_MASK);
++ priv->sfcmd |= (alen << SFCMD_ALEN_OFFSET) |
++ (dumlen << SFCMD_DUMLEN_OFFSET);
++ if (alen > 0)
++ ltq_ebu_w32(val, LTQ_SFADDR);
++
++ dev_dbg(dev, "write cmd %02X, alen=%d "
++ "(addr=%06X) dumlen=%d\n",
++ priv->sfcmd & SFCMD_OPC_MASK,
++ alen, val, dumlen);
++
++ if (bytelen > 0) {
++ /* continue with write */
++ state = state_write;
++ } else if (flags & FALCON_SPI_XFER_END) {
++ /* end of sequence? */
++ state = state_disable_cs;
++ } else {
++ /*
++ * go to end and expect another
++ * call (read or write)
++ */
++ state = state_end;
++ }
++ break;
++ }
++ case state_write:
++ {
++ /* txp still valid */
++ priv->sfcmd |= SFCMD_DIR_WRITE;
++ len = 0;
++ val = 0;
++ do {
++ if (bytelen--)
++ val |= (*txp++) << (8 * len++);
++ if ((flags & FALCON_SPI_XFER_END)
++ && (bytelen == 0)) {
++ priv->sfcmd &=
++ ~SFCMD_KEEP_CS_KEEP_SELECTED;
++ }
++ if ((len == 4) || (bytelen == 0)) {
++ ltq_ebu_w32(val, LTQ_SFDATA);
++ ltq_ebu_w32(priv->sfcmd
++ | (len<<SFCMD_DLEN_OFFSET),
++ LTQ_SFCMD);
++ len = 0;
++ val = 0;
++ priv->sfcmd &= ~(SFCMD_ALEN_MASK
++ | SFCMD_DUMLEN_MASK);
++ }
++ } while (bytelen);
++ state = state_end;
++ break;
++ }
++ case state_read:
++ {
++ /* read data */
++ priv->sfcmd &= ~SFCMD_DIR_WRITE;
++ do {
++ if ((flags & FALCON_SPI_XFER_END)
++ && (bytelen <= 4)) {
++ priv->sfcmd &=
++ ~SFCMD_KEEP_CS_KEEP_SELECTED;
++ }
++ len = (bytelen > 4) ? 4 : bytelen;
++ bytelen -= len;
++ ltq_ebu_w32(priv->sfcmd
++ |(len<<SFCMD_DLEN_OFFSET), LTQ_SFCMD);
++ priv->sfcmd &= ~(SFCMD_ALEN_MASK
++ | SFCMD_DUMLEN_MASK);
++ do {
++ val = ltq_ebu_r32(LTQ_SFSTAT);
++ if (val & SFSTAT_CMD_ERR) {
++ /* reset error status */
++ dev_err(dev, "SFSTAT: CMD_ERR "
++ "(%x)\n", val);
++ ltq_ebu_w32(SFSTAT_CMD_ERR,
++ LTQ_SFSTAT);
++ return -1;
++ }
++ } while (val & SFSTAT_CMD_PEND);
++ val = ltq_ebu_r32(LTQ_SFDATA);
++ do {
++ *rxp = (val & 0xFF);
++ rxp++;
++ val >>= 8;
++ len--;
++ } while (len);
++ } while (bytelen);
++ state = state_end;
++ break;
++ }
++ case state_disable_cs:
++ {
++ priv->sfcmd &= ~SFCMD_KEEP_CS_KEEP_SELECTED;
++ ltq_ebu_w32(priv->sfcmd | (0 << SFCMD_DLEN_OFFSET),
++ LTQ_SFCMD);
++ val = ltq_ebu_r32(LTQ_SFSTAT);
++ if (val & SFSTAT_CMD_ERR) {
++ /* reset error status */
++ dev_err(dev, "SFSTAT: CMD_ERR (%x)\n", val);
++ ltq_ebu_w32(SFSTAT_CMD_ERR, LTQ_SFSTAT);
++ return -1;
++ }
++ state = state_end;
++ break;
++ }
++ case state_end:
++ break;
++ }
++ } while (state != state_end);
++
++ return 0;
++}
++
++static int
++falcon_spi_setup(struct spi_device *spi)
++{
++ struct device *dev = &spi->dev;
++ const u32 ebuclk = 100000000;
++ unsigned int i;
++ unsigned long flags;
++
++ dev_dbg(dev, "setup\n");
++
++ if (spi->master->bus_num > 0 || spi->chip_select > 0)
++ return -ENODEV;
++
++ spin_lock_irqsave(&ebu_lock, flags);
++
++ if (ebuclk < spi->max_speed_hz) {
++ /* set EBU clock to 100 MHz */
++ ltq_sys1_w32_mask(0, EBUCC_EBUDIV_SELF100, LTQ_EBUCC);
++ i = 1; /* divider */
++ } else {
++ /* set EBU clock to 50 MHz */
++ ltq_sys1_w32_mask(EBUCC_EBUDIV_SELF100, 0, LTQ_EBUCC);
++
++ /* search for suitable divider */
++ for (i = 1; i < 7; i++) {
++ if (ebuclk / i <= spi->max_speed_hz)
++ break;
++ }
++ }
++
++ /* setup period of serial clock */
++ ltq_ebu_w32_mask(SFTIME_SCKF_POS_MASK
++ | SFTIME_SCKR_POS_MASK
++ | SFTIME_SCK_PER_MASK,
++ (i << SFTIME_SCKR_POS_OFFSET)
++ | (i << (SFTIME_SCK_PER_OFFSET + 1)),
++ LTQ_SFTIME);
++
++ /*
++ * set some bits of unused_wd, to not trigger HOLD/WP
++ * signals on non QUAD flashes
++ */
++ ltq_ebu_w32((SFIO_UNUSED_WD_MASK & (0x8 | 0x4)), LTQ_SFIO);
++
++ ltq_ebu_w32(BUSRCON0_AGEN_SERIAL_FLASH | BUSRCON0_PORTW_8_BIT_MUX,
++ LTQ_BUSRCON0);
++ ltq_ebu_w32(BUSWCON0_AGEN_SERIAL_FLASH, LTQ_BUSWCON0);
++ /* set address wrap around to maximum for 24-bit addresses */
++ ltq_ebu_w32_mask(SFCON_DEV_SIZE_MASK, SFCON_DEV_SIZE_A23_0, LTQ_SFCON);
++
++ spin_unlock_irqrestore(&ebu_lock, flags);
++
++ return 0;
++}
++
++static int
++falcon_spi_transfer(struct spi_device *spi, struct spi_message *m)
++{
++ struct falcon_spi *priv = spi_master_get_devdata(spi->master);
++ struct spi_transfer *t;
++ unsigned long spi_flags;
++ unsigned long flags;
++ int ret = 0;
++
++ priv->sfcmd = 0;
++ m->actual_length = 0;
++
++ spi_flags = FALCON_SPI_XFER_BEGIN;
++ list_for_each_entry(t, &m->transfers, transfer_list) {
++ if (list_is_last(&t->transfer_list, &m->transfers))
++ spi_flags |= FALCON_SPI_XFER_END;
++
++ spin_lock_irqsave(&ebu_lock, flags);
++ ret = falcon_spi_xfer(spi, t, spi_flags);
++ spin_unlock_irqrestore(&ebu_lock, flags);
++
++ if (ret)
++ break;
++
++ m->actual_length += t->len;
++
++ if (t->delay_usecs || t->cs_change)
++ BUG();
++
++ spi_flags = 0;
++ }
++
++ m->status = ret;
++ m->complete(m->context);
++
++ return 0;
++}
++
++static void
++falcon_spi_cleanup(struct spi_device *spi)
++{
++ struct device *dev = &spi->dev;
++
++ dev_dbg(dev, "cleanup\n");
++}
++
++static int __devinit
++falcon_spi_probe(struct platform_device *pdev)
++{
++ struct device *dev = &pdev->dev;
++ struct falcon_spi *priv;
++ struct spi_master *master;
++ int ret;
++
++ dev_dbg(dev, "probing\n");
++
++ master = spi_alloc_master(&pdev->dev, sizeof(*priv));
++ if (!master) {
++ dev_err(dev, "no memory for spi_master\n");
++ return -ENOMEM;
++ }
++
++ priv = spi_master_get_devdata(master);
++ priv->master = master;
++
++ master->mode_bits = SPI_MODE_3;
++ master->num_chipselect = 1;
++ master->bus_num = 0;
++
++ master->setup = falcon_spi_setup;
++ master->transfer = falcon_spi_transfer;
++ master->cleanup = falcon_spi_cleanup;
++
++ platform_set_drvdata(pdev, priv);
++
++ ret = spi_register_master(master);
++ if (ret)
++ spi_master_put(master);
++
++ return ret;
++}
++
++static int __devexit
++falcon_spi_remove(struct platform_device *pdev)
++{
++ struct device *dev = &pdev->dev;
++ struct falcon_spi *priv = platform_get_drvdata(pdev);
++
++ dev_dbg(dev, "removed\n");
++
++ spi_unregister_master(priv->master);
++
++ return 0;
++}
++
++static struct platform_driver falcon_spi_driver = {
++ .probe = falcon_spi_probe,
++ .remove = __devexit_p(falcon_spi_remove),
++ .driver = {
++ .name = DRV_NAME,
++ .owner = THIS_MODULE
++ }
++};
++
++static int __init
++falcon_spi_init(void)
++{
++ return platform_driver_register(&falcon_spi_driver);
++}
++
++static void __exit
++falcon_spi_exit(void)
++{
++ platform_driver_unregister(&falcon_spi_driver);
++}
++
++module_init(falcon_spi_init);
++module_exit(falcon_spi_exit);
++
++MODULE_LICENSE("GPL");
++MODULE_DESCRIPTION("Lantiq Falcon SPI controller driver");
+--
+1.7.7.1
+
projects / openwrt.git / blobdiff