summaryrefslogtreecommitdiff
path: root/target/linux/lantiq/patches-3.2/0038-SPI-MIPS-lantiq-add-FALC-ON-spi-driver.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/lantiq/patches-3.2/0038-SPI-MIPS-lantiq-add-FALC-ON-spi-driver.patch')
-rw-r--r--target/linux/lantiq/patches-3.2/0038-SPI-MIPS-lantiq-add-FALC-ON-spi-driver.patch617
1 files changed, 0 insertions, 617 deletions
diff --git a/target/linux/lantiq/patches-3.2/0038-SPI-MIPS-lantiq-add-FALC-ON-spi-driver.patch b/target/linux/lantiq/patches-3.2/0038-SPI-MIPS-lantiq-add-FALC-ON-spi-driver.patch
deleted file mode 100644
index 3b2cc80228..0000000000
--- a/target/linux/lantiq/patches-3.2/0038-SPI-MIPS-lantiq-add-FALC-ON-spi-driver.patch
+++ /dev/null
@@ -1,617 +0,0 @@
-From addbb26930d41b35e329d0ad6413cc8d087aa4cc Mon Sep 17 00:00:00 2001
-From: John Crispin <blogic@openwrt.org>
-Date: Sat, 27 Aug 2011 18:12:26 +0200
-Subject: [PATCH 38/73] 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
-
---- 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(&ltq_spi);
-+}
---- 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
---- 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_
- .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)",
---- a/drivers/spi/Kconfig
-+++ b/drivers/spi/Kconfig
-@@ -189,6 +189,10 @@ 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
---- a/drivers/spi/Makefile
-+++ b/drivers/spi/Makefile
-@@ -25,6 +25,7 @@ obj-$(CONFIG_SPI_DW_MMIO) += spi-dw-mmi
- obj-$(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
---- /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");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 15:37:58 +0000