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-rw-r--r--target/linux/lantiq/patches-3.18/0033-SPI-MIPS-lantiq-adds-spi-xway.patch1022
1 files changed, 1022 insertions, 0 deletions
diff --git a/target/linux/lantiq/patches-3.18/0033-SPI-MIPS-lantiq-adds-spi-xway.patch b/target/linux/lantiq/patches-3.18/0033-SPI-MIPS-lantiq-adds-spi-xway.patch
new file mode 100644
index 0000000..81e5d39
--- /dev/null
+++ b/target/linux/lantiq/patches-3.18/0033-SPI-MIPS-lantiq-adds-spi-xway.patch
@@ -0,0 +1,1022 @@
+From e75df4f96373e5d16f8ca13aa031e54cdcfeda62 Mon Sep 17 00:00:00 2001
+From: John Crispin <blogic@openwrt.org>
+Date: Wed, 13 Mar 2013 09:29:37 +0100
+Subject: [PATCH 33/36] SPI: MIPS: lantiq: adds spi-xway
+
+This patch adds support for the SPI core found on several Lantiq SoCs.
+The Driver has been runtime tested in combination with m25p80 Flash Devices
+on Amazon_SE and VR9.
+
+Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>
+Signed-off-by: John Crispin <blogic@openwrt.org>
+---
+ drivers/spi/Kconfig | 8 +
+ drivers/spi/Makefile | 1 +
+ drivers/spi/spi-xway.c | 977 ++++++++++++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 986 insertions(+)
+ create mode 100644 drivers/spi/spi-xway.c
+
+--- a/drivers/spi/Kconfig
++++ b/drivers/spi/Kconfig
+@@ -597,6 +597,14 @@ config SPI_NUC900
+ help
+ SPI driver for Nuvoton NUC900 series ARM SoCs
+
++config SPI_XWAY
++ tristate "Lantiq XWAY SPI controller"
++ depends on LANTIQ && SOC_TYPE_XWAY
++ select SPI_BITBANG
++ help
++ This driver supports the Lantiq SoC SPI controller in master
++ mode.
++
+ #
+ # Add new SPI master controllers in alphabetical order above this line
+ #
+--- a/drivers/spi/Makefile
++++ b/drivers/spi/Makefile
+@@ -86,3 +86,4 @@ obj-$(CONFIG_SPI_TXX9) += spi-txx9.o
+ obj-$(CONFIG_SPI_XCOMM) += spi-xcomm.o
+ obj-$(CONFIG_SPI_XILINX) += spi-xilinx.o
+ obj-$(CONFIG_SPI_XTENSA_XTFPGA) += spi-xtensa-xtfpga.o
++obj-$(CONFIG_SPI_XWAY) += spi-xway.o
+--- /dev/null
++++ b/drivers/spi/spi-xway.c
+@@ -0,0 +1,977 @@
++/*
++ * Lantiq SoC SPI controller
++ *
++ * Copyright (C) 2011 Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>
++ * Copyright (C) 2012 John Crispin <blogic@openwrt.org>
++ *
++ * This program is free software; you can distribute 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/workqueue.h>
++#include <linux/platform_device.h>
++#include <linux/io.h>
++#include <linux/sched.h>
++#include <linux/delay.h>
++#include <linux/interrupt.h>
++#include <linux/completion.h>
++#include <linux/spinlock.h>
++#include <linux/err.h>
++#include <linux/clk.h>
++#include <linux/spi/spi.h>
++#include <linux/spi/spi_bitbang.h>
++#include <linux/of_irq.h>
++
++#include <lantiq_soc.h>
++
++#define LTQ_SPI_CLC 0x00 /* Clock control */
++#define LTQ_SPI_PISEL 0x04 /* Port input select */
++#define LTQ_SPI_ID 0x08 /* Identification */
++#define LTQ_SPI_CON 0x10 /* Control */
++#define LTQ_SPI_STAT 0x14 /* Status */
++#define LTQ_SPI_WHBSTATE 0x18 /* Write HW modified state */
++#define LTQ_SPI_TB 0x20 /* Transmit buffer */
++#define LTQ_SPI_RB 0x24 /* Receive buffer */
++#define LTQ_SPI_RXFCON 0x30 /* Receive FIFO control */
++#define LTQ_SPI_TXFCON 0x34 /* Transmit FIFO control */
++#define LTQ_SPI_FSTAT 0x38 /* FIFO status */
++#define LTQ_SPI_BRT 0x40 /* Baudrate timer */
++#define LTQ_SPI_BRSTAT 0x44 /* Baudrate timer status */
++#define LTQ_SPI_SFCON 0x60 /* Serial frame control */
++#define LTQ_SPI_SFSTAT 0x64 /* Serial frame status */
++#define LTQ_SPI_GPOCON 0x70 /* General purpose output control */
++#define LTQ_SPI_GPOSTAT 0x74 /* General purpose output status */
++#define LTQ_SPI_FGPO 0x78 /* Forced general purpose output */
++#define LTQ_SPI_RXREQ 0x80 /* Receive request */
++#define LTQ_SPI_RXCNT 0x84 /* Receive count */
++#define LTQ_SPI_DMACON 0xEC /* DMA control */
++#define LTQ_SPI_IRNEN 0xF4 /* Interrupt node enable */
++#define LTQ_SPI_IRNICR 0xF8 /* Interrupt node interrupt capture */
++#define LTQ_SPI_IRNCR 0xFC /* Interrupt node control */
++
++#define LTQ_SPI_CLC_SMC_SHIFT 16 /* Clock divider for sleep mode */
++#define LTQ_SPI_CLC_SMC_MASK 0xFF
++#define LTQ_SPI_CLC_RMC_SHIFT 8 /* Clock divider for normal run mode */
++#define LTQ_SPI_CLC_RMC_MASK 0xFF
++#define LTQ_SPI_CLC_DISS BIT(1) /* Disable status bit */
++#define LTQ_SPI_CLC_DISR BIT(0) /* Disable request bit */
++
++#define LTQ_SPI_ID_TXFS_SHIFT 24 /* Implemented TX FIFO size */
++#define LTQ_SPI_ID_TXFS_MASK 0x3F
++#define LTQ_SPI_ID_RXFS_SHIFT 16 /* Implemented RX FIFO size */
++#define LTQ_SPI_ID_RXFS_MASK 0x3F
++#define LTQ_SPI_ID_REV_MASK 0x1F /* Hardware revision number */
++#define LTQ_SPI_ID_CFG BIT(5) /* DMA interface support */
++
++#define LTQ_SPI_CON_BM_SHIFT 16 /* Data width selection */
++#define LTQ_SPI_CON_BM_MASK 0x1F
++#define LTQ_SPI_CON_EM BIT(24) /* Echo mode */
++#define LTQ_SPI_CON_IDLE BIT(23) /* Idle bit value */
++#define LTQ_SPI_CON_ENBV BIT(22) /* Enable byte valid control */
++#define LTQ_SPI_CON_RUEN BIT(12) /* Receive underflow error enable */
++#define LTQ_SPI_CON_TUEN BIT(11) /* Transmit underflow error enable */
++#define LTQ_SPI_CON_AEN BIT(10) /* Abort error enable */
++#define LTQ_SPI_CON_REN BIT(9) /* Receive overflow error enable */
++#define LTQ_SPI_CON_TEN BIT(8) /* Transmit overflow error enable */
++#define LTQ_SPI_CON_LB BIT(7) /* Loopback control */
++#define LTQ_SPI_CON_PO BIT(6) /* Clock polarity control */
++#define LTQ_SPI_CON_PH BIT(5) /* Clock phase control */
++#define LTQ_SPI_CON_HB BIT(4) /* Heading control */
++#define LTQ_SPI_CON_RXOFF BIT(1) /* Switch receiver off */
++#define LTQ_SPI_CON_TXOFF BIT(0) /* Switch transmitter off */
++
++#define LTQ_SPI_STAT_RXBV_MASK 0x7
++#define LTQ_SPI_STAT_RXBV_SHIFT 28
++#define LTQ_SPI_STAT_BSY BIT(13) /* Busy flag */
++#define LTQ_SPI_STAT_RUE BIT(12) /* Receive underflow error flag */
++#define LTQ_SPI_STAT_TUE BIT(11) /* Transmit underflow error flag */
++#define LTQ_SPI_STAT_AE BIT(10) /* Abort error flag */
++#define LTQ_SPI_STAT_RE BIT(9) /* Receive error flag */
++#define LTQ_SPI_STAT_TE BIT(8) /* Transmit error flag */
++#define LTQ_SPI_STAT_MS BIT(1) /* Master/slave select bit */
++#define LTQ_SPI_STAT_EN BIT(0) /* Enable bit */
++
++#define LTQ_SPI_WHBSTATE_SETTUE BIT(15) /* Set transmit underflow error flag */
++#define LTQ_SPI_WHBSTATE_SETAE BIT(14) /* Set abort error flag */
++#define LTQ_SPI_WHBSTATE_SETRE BIT(13) /* Set receive error flag */
++#define LTQ_SPI_WHBSTATE_SETTE BIT(12) /* Set transmit error flag */
++#define LTQ_SPI_WHBSTATE_CLRTUE BIT(11) /* Clear transmit underflow error
++ flag */
++#define LTQ_SPI_WHBSTATE_CLRAE BIT(10) /* Clear abort error flag */
++#define LTQ_SPI_WHBSTATE_CLRRE BIT(9) /* Clear receive error flag */
++#define LTQ_SPI_WHBSTATE_CLRTE BIT(8) /* Clear transmit error flag */
++#define LTQ_SPI_WHBSTATE_SETME BIT(7) /* Set mode error flag */
++#define LTQ_SPI_WHBSTATE_CLRME BIT(6) /* Clear mode error flag */
++#define LTQ_SPI_WHBSTATE_SETRUE BIT(5) /* Set receive underflow error flag */
++#define LTQ_SPI_WHBSTATE_CLRRUE BIT(4) /* Clear receive underflow error flag */
++#define LTQ_SPI_WHBSTATE_SETMS BIT(3) /* Set master select bit */
++#define LTQ_SPI_WHBSTATE_CLRMS BIT(2) /* Clear master select bit */
++#define LTQ_SPI_WHBSTATE_SETEN BIT(1) /* Set enable bit (operational mode) */
++#define LTQ_SPI_WHBSTATE_CLREN BIT(0) /* Clear enable bit (config mode */
++#define LTQ_SPI_WHBSTATE_CLR_ERRORS 0x0F50
++
++#define LTQ_SPI_RXFCON_RXFITL_SHIFT 8 /* FIFO interrupt trigger level */
++#define LTQ_SPI_RXFCON_RXFITL_MASK 0x3F
++#define LTQ_SPI_RXFCON_RXFLU BIT(1) /* FIFO flush */
++#define LTQ_SPI_RXFCON_RXFEN BIT(0) /* FIFO enable */
++
++#define LTQ_SPI_TXFCON_TXFITL_SHIFT 8 /* FIFO interrupt trigger level */
++#define LTQ_SPI_TXFCON_TXFITL_MASK 0x3F
++#define LTQ_SPI_TXFCON_TXFLU BIT(1) /* FIFO flush */
++#define LTQ_SPI_TXFCON_TXFEN BIT(0) /* FIFO enable */
++
++#define LTQ_SPI_FSTAT_RXFFL_MASK 0x3f
++#define LTQ_SPI_FSTAT_RXFFL_SHIFT 0
++#define LTQ_SPI_FSTAT_TXFFL_MASK 0x3f
++#define LTQ_SPI_FSTAT_TXFFL_SHIFT 8
++
++#define LTQ_SPI_GPOCON_ISCSBN_SHIFT 8
++#define LTQ_SPI_GPOCON_INVOUTN_SHIFT 0
++
++#define LTQ_SPI_FGPO_SETOUTN_SHIFT 8
++#define LTQ_SPI_FGPO_CLROUTN_SHIFT 0
++
++#define LTQ_SPI_RXREQ_RXCNT_MASK 0xFFFF /* Receive count value */
++#define LTQ_SPI_RXCNT_TODO_MASK 0xFFFF /* Recevie to-do value */
++
++#define LTQ_SPI_IRNEN_F BIT(3) /* Frame end interrupt request */
++#define LTQ_SPI_IRNEN_E BIT(2) /* Error end interrupt request */
++#define LTQ_SPI_IRNEN_T BIT(1) /* Transmit end interrupt request */
++#define LTQ_SPI_IRNEN_R BIT(0) /* Receive end interrupt request */
++#define LTQ_SPI_IRNEN_ALL 0xF
++
++struct ltq_spi {
++ struct spi_bitbang bitbang;
++ struct completion done;
++ spinlock_t lock;
++
++ struct device *dev;
++ void __iomem *base;
++ struct clk *fpiclk;
++ struct clk *spiclk;
++
++ int status;
++ int irq[3];
++
++ const u8 *tx;
++ u8 *rx;
++ u32 tx_cnt;
++ u32 rx_cnt;
++ u32 len;
++ struct spi_transfer *curr_transfer;
++
++ u32 (*get_tx) (struct ltq_spi *);
++
++ u16 txfs;
++ u16 rxfs;
++ unsigned dma_support:1;
++ unsigned cfg_mode:1;
++};
++
++static inline struct ltq_spi *ltq_spi_to_hw(struct spi_device *spi)
++{
++ return spi_master_get_devdata(spi->master);
++}
++
++static inline u32 ltq_spi_reg_read(struct ltq_spi *hw, u32 reg)
++{
++ return ioread32be(hw->base + reg);
++}
++
++static inline void ltq_spi_reg_write(struct ltq_spi *hw, u32 val, u32 reg)
++{
++ iowrite32be(val, hw->base + reg);
++}
++
++static inline void ltq_spi_reg_setbit(struct ltq_spi *hw, u32 bits, u32 reg)
++{
++ u32 val;
++
++ val = ltq_spi_reg_read(hw, reg);
++ val |= bits;
++ ltq_spi_reg_write(hw, val, reg);
++}
++
++static inline void ltq_spi_reg_clearbit(struct ltq_spi *hw, u32 bits, u32 reg)
++{
++ u32 val;
++
++ val = ltq_spi_reg_read(hw, reg);
++ val &= ~bits;
++ ltq_spi_reg_write(hw, val, reg);
++}
++
++static void ltq_spi_hw_enable(struct ltq_spi *hw)
++{
++ u32 clc;
++
++ /* Power-up module */
++ clk_enable(hw->spiclk);
++
++ /*
++ * Set clock divider for run mode to 1 to
++ * run at same frequency as FPI bus
++ */
++ clc = (1 << LTQ_SPI_CLC_RMC_SHIFT);
++ ltq_spi_reg_write(hw, clc, LTQ_SPI_CLC);
++}
++
++static void ltq_spi_hw_disable(struct ltq_spi *hw)
++{
++ /* Set clock divider to 0 and set module disable bit */
++ ltq_spi_reg_write(hw, LTQ_SPI_CLC_DISS, LTQ_SPI_CLC);
++
++ /* Power-down module */
++ clk_disable(hw->spiclk);
++}
++
++static void ltq_spi_reset_fifos(struct ltq_spi *hw)
++{
++ u32 val;
++
++ /*
++ * Enable and flush FIFOs. Set interrupt trigger level to
++ * half of FIFO count implemented in hardware.
++ */
++ if (hw->txfs > 1) {
++ val = hw->txfs << (LTQ_SPI_TXFCON_TXFITL_SHIFT - 1);
++ val |= LTQ_SPI_TXFCON_TXFEN | LTQ_SPI_TXFCON_TXFLU;
++ ltq_spi_reg_write(hw, val, LTQ_SPI_TXFCON);
++ }
++
++ if (hw->rxfs > 1) {
++ val = hw->rxfs << (LTQ_SPI_RXFCON_RXFITL_SHIFT - 1);
++ val |= LTQ_SPI_RXFCON_RXFEN | LTQ_SPI_RXFCON_RXFLU;
++ ltq_spi_reg_write(hw, val, LTQ_SPI_RXFCON);
++ }
++}
++
++static inline int ltq_spi_wait_ready(struct ltq_spi *hw)
++{
++ u32 stat;
++ unsigned long timeout;
++
++ timeout = jiffies + msecs_to_jiffies(200);
++
++ do {
++ stat = ltq_spi_reg_read(hw, LTQ_SPI_STAT);
++ if (!(stat & LTQ_SPI_STAT_BSY))
++ return 0;
++
++ cond_resched();
++ } while (!time_after_eq(jiffies, timeout));
++
++ dev_err(hw->dev, "SPI wait ready timed out stat: %x\n", stat);
++
++ return -ETIMEDOUT;
++}
++
++static void ltq_spi_config_mode_set(struct ltq_spi *hw)
++{
++ if (hw->cfg_mode)
++ return;
++
++ /*
++ * Putting the SPI module in config mode is only safe if no
++ * transfer is in progress as indicated by busy flag STATE.BSY.
++ */
++ if (ltq_spi_wait_ready(hw)) {
++ ltq_spi_reset_fifos(hw);
++ hw->status = -ETIMEDOUT;
++ }
++ ltq_spi_reg_write(hw, LTQ_SPI_WHBSTATE_CLREN, LTQ_SPI_WHBSTATE);
++
++ hw->cfg_mode = 1;
++}
++
++static void ltq_spi_run_mode_set(struct ltq_spi *hw)
++{
++ if (!hw->cfg_mode)
++ return;
++
++ ltq_spi_reg_write(hw, LTQ_SPI_WHBSTATE_SETEN, LTQ_SPI_WHBSTATE);
++
++ hw->cfg_mode = 0;
++}
++
++static u32 ltq_spi_tx_word_u8(struct ltq_spi *hw)
++{
++ const u8 *tx = hw->tx;
++ u32 data = *tx++;
++
++ hw->tx_cnt++;
++ hw->tx++;
++
++ return data;
++}
++
++static u32 ltq_spi_tx_word_u16(struct ltq_spi *hw)
++{
++ const u16 *tx = (u16 *) hw->tx;
++ u32 data = *tx++;
++
++ hw->tx_cnt += 2;
++ hw->tx += 2;
++
++ return data;
++}
++
++static u32 ltq_spi_tx_word_u32(struct ltq_spi *hw)
++{
++ const u32 *tx = (u32 *) hw->tx;
++ u32 data = *tx++;
++
++ hw->tx_cnt += 4;
++ hw->tx += 4;
++
++ return data;
++}
++
++static void ltq_spi_bits_per_word_set(struct spi_device *spi)
++{
++ struct ltq_spi *hw = ltq_spi_to_hw(spi);
++ u32 bm;
++ u8 bits_per_word = spi->bits_per_word;
++
++ /*
++ * Use either default value of SPI device or value
++ * from current transfer.
++ */
++ if (hw->curr_transfer && hw->curr_transfer->bits_per_word)
++ bits_per_word = hw->curr_transfer->bits_per_word;
++
++ if (bits_per_word <= 8)
++ hw->get_tx = ltq_spi_tx_word_u8;
++ else if (bits_per_word <= 16)
++ hw->get_tx = ltq_spi_tx_word_u16;
++ else if (bits_per_word <= 32)
++ hw->get_tx = ltq_spi_tx_word_u32;
++
++ /* CON.BM value = bits_per_word - 1 */
++ bm = (bits_per_word - 1) << LTQ_SPI_CON_BM_SHIFT;
++
++ ltq_spi_reg_clearbit(hw, LTQ_SPI_CON_BM_MASK <<
++ LTQ_SPI_CON_BM_SHIFT, LTQ_SPI_CON);
++ ltq_spi_reg_setbit(hw, bm, LTQ_SPI_CON);
++}
++
++static void ltq_spi_speed_set(struct spi_device *spi)
++{
++ struct ltq_spi *hw = ltq_spi_to_hw(spi);
++ u32 br, max_speed_hz, spi_clk;
++ u32 speed_hz = spi->max_speed_hz;
++
++ /*
++ * Use either default value of SPI device or value
++ * from current transfer.
++ */
++ if (hw->curr_transfer && hw->curr_transfer->speed_hz)
++ speed_hz = hw->curr_transfer->speed_hz;
++
++ /*
++ * SPI module clock is derived from FPI bus clock dependent on
++ * divider value in CLC.RMS which is always set to 1.
++ */
++ spi_clk = clk_get_rate(hw->fpiclk);
++
++ /*
++ * Maximum SPI clock frequency in master mode is half of
++ * SPI module clock frequency. Maximum reload value of
++ * baudrate generator BR is 2^16.
++ */
++ max_speed_hz = spi_clk / 2;
++ if (speed_hz >= max_speed_hz)
++ br = 0;
++ else
++ br = (max_speed_hz / speed_hz) - 1;
++
++ if (br > 0xFFFF)
++ br = 0xFFFF;
++
++ ltq_spi_reg_write(hw, br, LTQ_SPI_BRT);
++}
++
++static void ltq_spi_clockmode_set(struct spi_device *spi)
++{
++ struct ltq_spi *hw = ltq_spi_to_hw(spi);
++ u32 con;
++
++ con = ltq_spi_reg_read(hw, LTQ_SPI_CON);
++
++ /*
++ * SPI mode mapping in CON register:
++ * Mode CPOL CPHA CON.PO CON.PH
++ * 0 0 0 0 1
++ * 1 0 1 0 0
++ * 2 1 0 1 1
++ * 3 1 1 1 0
++ */
++ if (spi->mode & SPI_CPHA)
++ con &= ~LTQ_SPI_CON_PH;
++ else
++ con |= LTQ_SPI_CON_PH;
++
++ if (spi->mode & SPI_CPOL)
++ con |= LTQ_SPI_CON_PO;
++ else
++ con &= ~LTQ_SPI_CON_PO;
++
++ /* Set heading control */
++ if (spi->mode & SPI_LSB_FIRST)
++ con &= ~LTQ_SPI_CON_HB;
++ else
++ con |= LTQ_SPI_CON_HB;
++
++ ltq_spi_reg_write(hw, con, LTQ_SPI_CON);
++}
++
++static void ltq_spi_xmit_set(struct ltq_spi *hw, struct spi_transfer *t)
++{
++ u32 con;
++
++ con = ltq_spi_reg_read(hw, LTQ_SPI_CON);
++
++ if (t) {
++ if (t->tx_buf && t->rx_buf) {
++ con &= ~(LTQ_SPI_CON_TXOFF | LTQ_SPI_CON_RXOFF);
++ } else if (t->rx_buf) {
++ con &= ~LTQ_SPI_CON_RXOFF;
++ con |= LTQ_SPI_CON_TXOFF;
++ } else if (t->tx_buf) {
++ con &= ~LTQ_SPI_CON_TXOFF;
++ con |= LTQ_SPI_CON_RXOFF;
++ }
++ } else
++ con |= (LTQ_SPI_CON_TXOFF | LTQ_SPI_CON_RXOFF);
++
++ ltq_spi_reg_write(hw, con, LTQ_SPI_CON);
++}
++
++static void ltq_spi_internal_cs_activate(struct spi_device *spi)
++{
++ struct ltq_spi *hw = ltq_spi_to_hw(spi);
++ u32 fgpo;
++
++ fgpo = (1 << (spi->chip_select + LTQ_SPI_FGPO_CLROUTN_SHIFT));
++ ltq_spi_reg_setbit(hw, fgpo, LTQ_SPI_FGPO);
++}
++
++static void ltq_spi_internal_cs_deactivate(struct spi_device *spi)
++{
++ struct ltq_spi *hw = ltq_spi_to_hw(spi);
++ u32 fgpo;
++
++ fgpo = (1 << (spi->chip_select + LTQ_SPI_FGPO_SETOUTN_SHIFT));
++ ltq_spi_reg_setbit(hw, fgpo, LTQ_SPI_FGPO);
++}
++
++static void ltq_spi_chipselect(struct spi_device *spi, int cs)
++{
++ struct ltq_spi *hw = ltq_spi_to_hw(spi);
++
++ switch (cs) {
++ case BITBANG_CS_ACTIVE:
++ ltq_spi_bits_per_word_set(spi);
++ ltq_spi_speed_set(spi);
++ ltq_spi_clockmode_set(spi);
++ ltq_spi_run_mode_set(hw);
++ ltq_spi_internal_cs_activate(spi);
++ break;
++
++ case BITBANG_CS_INACTIVE:
++ ltq_spi_internal_cs_deactivate(spi);
++ ltq_spi_config_mode_set(hw);
++ break;
++ }
++}
++
++static int ltq_spi_setup_transfer(struct spi_device *spi,
++ struct spi_transfer *t)
++{
++ struct ltq_spi *hw = ltq_spi_to_hw(spi);
++ u8 bits_per_word = spi->bits_per_word;
++
++ hw->curr_transfer = t;
++
++ if (t && t->bits_per_word)
++ bits_per_word = t->bits_per_word;
++
++ if (bits_per_word > 32)
++ return -EINVAL;
++
++ ltq_spi_config_mode_set(hw);
++
++ return 0;
++}
++
++static int ltq_spi_setup(struct spi_device *spi)
++{
++ struct ltq_spi *hw = ltq_spi_to_hw(spi);
++ u32 gpocon, fgpo;
++
++ /* Set default word length to 8 if not set */
++ if (!spi->bits_per_word)
++ spi->bits_per_word = 8;
++
++ if (spi->bits_per_word > 32)
++ return -EINVAL;
++
++ /*
++ * Up to six GPIOs can be connected to the SPI module
++ * via GPIO alternate function to control the chip select lines.
++ */
++ gpocon = (1 << (spi->chip_select +
++ LTQ_SPI_GPOCON_ISCSBN_SHIFT));
++
++ if (spi->mode & SPI_CS_HIGH)
++ gpocon |= (1 << spi->chip_select);
++
++ fgpo = (1 << (spi->chip_select + LTQ_SPI_FGPO_SETOUTN_SHIFT));
++
++ ltq_spi_reg_setbit(hw, gpocon, LTQ_SPI_GPOCON);
++ ltq_spi_reg_setbit(hw, fgpo, LTQ_SPI_FGPO);
++
++ return 0;
++}
++
++static void ltq_spi_cleanup(struct spi_device *spi)
++{
++
++}
++
++static void ltq_spi_txfifo_write(struct ltq_spi *hw)
++{
++ u32 fstat, data;
++ u16 fifo_space;
++
++ /* Determine how much FIFOs are free for TX data */
++ fstat = ltq_spi_reg_read(hw, LTQ_SPI_FSTAT);
++ fifo_space = hw->txfs - ((fstat >> LTQ_SPI_FSTAT_TXFFL_SHIFT) &
++ LTQ_SPI_FSTAT_TXFFL_MASK);
++
++ if (!fifo_space)
++ return;
++
++ while (hw->tx_cnt < hw->len && fifo_space) {
++ data = hw->get_tx(hw);
++ ltq_spi_reg_write(hw, data, LTQ_SPI_TB);
++ fifo_space--;
++ }
++}
++
++static void ltq_spi_rxfifo_read(struct ltq_spi *hw)
++{
++ u32 fstat, data, *rx32;
++ u16 fifo_fill;
++ u8 rxbv, shift, *rx8;
++
++ /* Determine how much FIFOs are filled with RX data */
++ fstat = ltq_spi_reg_read(hw, LTQ_SPI_FSTAT);
++ fifo_fill = ((fstat >> LTQ_SPI_FSTAT_RXFFL_SHIFT)
++ & LTQ_SPI_FSTAT_RXFFL_MASK);
++
++ if (!fifo_fill)
++ return;
++
++ /*
++ * The 32 bit FIFO is always used completely independent from the
++ * bits_per_word value. Thus four bytes have to be read at once
++ * per FIFO.
++ */
++ rx32 = (u32 *) hw->rx;
++ while (hw->len - hw->rx_cnt >= 4 && fifo_fill) {
++ *rx32++ = ltq_spi_reg_read(hw, LTQ_SPI_RB);
++ hw->rx_cnt += 4;
++ hw->rx += 4;
++ fifo_fill--;
++ }
++
++ /*
++ * If there are remaining bytes, read byte count from STAT.RXBV
++ * register and read the data byte-wise.
++ */
++ while (fifo_fill && hw->rx_cnt < hw->len) {
++ rxbv = (ltq_spi_reg_read(hw, LTQ_SPI_STAT) >>
++ LTQ_SPI_STAT_RXBV_SHIFT) & LTQ_SPI_STAT_RXBV_MASK;
++ data = ltq_spi_reg_read(hw, LTQ_SPI_RB);
++
++ shift = (rxbv - 1) * 8;
++ rx8 = hw->rx;
++
++ while (rxbv) {
++ *rx8++ = (data >> shift) & 0xFF;
++ rxbv--;
++ shift -= 8;
++ hw->rx_cnt++;
++ hw->rx++;
++ }
++
++ fifo_fill--;
++ }
++}
++
++static void ltq_spi_rxreq_set(struct ltq_spi *hw)
++{
++ u32 rxreq, rxreq_max, rxtodo;
++
++ rxtodo = ltq_spi_reg_read(hw, LTQ_SPI_RXCNT) & LTQ_SPI_RXCNT_TODO_MASK;
++
++ /*
++ * In RX-only mode the serial clock is activated only after writing
++ * the expected amount of RX bytes into RXREQ register.
++ * To avoid receive overflows at high clocks it is better to request
++ * only the amount of bytes that fits into all FIFOs. This value
++ * depends on the FIFO size implemented in hardware.
++ */
++ rxreq = hw->len - hw->rx_cnt;
++ rxreq_max = hw->rxfs << 2;
++ rxreq = min(rxreq_max, rxreq);
++
++ if (!rxtodo && rxreq)
++ ltq_spi_reg_write(hw, rxreq, LTQ_SPI_RXREQ);
++}
++
++static inline void ltq_spi_complete(struct ltq_spi *hw)
++{
++ complete(&hw->done);
++}
++
++irqreturn_t ltq_spi_tx_irq(int irq, void *data)
++{
++ struct ltq_spi *hw = data;
++ unsigned long flags;
++ int completed = 0;
++
++ spin_lock_irqsave(&hw->lock, flags);
++
++ if (hw->tx_cnt < hw->len)
++ ltq_spi_txfifo_write(hw);
++
++ if (hw->tx_cnt == hw->len)
++ completed = 1;
++
++ spin_unlock_irqrestore(&hw->lock, flags);
++
++ if (completed)
++ ltq_spi_complete(hw);
++
++ return IRQ_HANDLED;
++}
++
++irqreturn_t ltq_spi_rx_irq(int irq, void *data)
++{
++ struct ltq_spi *hw = data;
++ unsigned long flags;
++ int completed = 0;
++
++ spin_lock_irqsave(&hw->lock, flags);
++
++ if (hw->rx_cnt < hw->len) {
++ ltq_spi_rxfifo_read(hw);
++
++ if (hw->tx && hw->tx_cnt < hw->len)
++ ltq_spi_txfifo_write(hw);
++ }
++
++ if (hw->rx_cnt == hw->len)
++ completed = 1;
++ else if (!hw->tx)
++ ltq_spi_rxreq_set(hw);
++
++ spin_unlock_irqrestore(&hw->lock, flags);
++
++ if (completed)
++ ltq_spi_complete(hw);
++
++ return IRQ_HANDLED;
++}
++
++irqreturn_t ltq_spi_err_irq(int irq, void *data)
++{
++ struct ltq_spi *hw = data;
++ unsigned long flags;
++
++ spin_lock_irqsave(&hw->lock, flags);
++
++ /* Disable all interrupts */
++ ltq_spi_reg_clearbit(hw, LTQ_SPI_IRNEN_ALL, LTQ_SPI_IRNEN);
++
++ dev_err(hw->dev, "error %x\n", ltq_spi_reg_read(hw, LTQ_SPI_STAT));
++
++ /* Clear all error flags */
++ ltq_spi_reg_write(hw, LTQ_SPI_WHBSTATE_CLR_ERRORS, LTQ_SPI_WHBSTATE);
++
++ /* Flush FIFOs */
++ ltq_spi_reg_setbit(hw, LTQ_SPI_RXFCON_RXFLU, LTQ_SPI_RXFCON);
++ ltq_spi_reg_setbit(hw, LTQ_SPI_TXFCON_TXFLU, LTQ_SPI_TXFCON);
++
++ hw->status = -EIO;
++ spin_unlock_irqrestore(&hw->lock, flags);
++
++ ltq_spi_complete(hw);
++
++ return IRQ_HANDLED;
++}
++
++static int ltq_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t)
++{
++ struct ltq_spi *hw = ltq_spi_to_hw(spi);
++ u32 irq_flags = 0;
++
++ hw->tx = t->tx_buf;
++ hw->rx = t->rx_buf;
++ hw->len = t->len;
++ hw->tx_cnt = 0;
++ hw->rx_cnt = 0;
++ hw->status = 0;
++ init_completion(&hw->done);
++
++ ltq_spi_xmit_set(hw, t);
++
++ /* Enable error interrupts */
++ ltq_spi_reg_setbit(hw, LTQ_SPI_IRNEN_E, LTQ_SPI_IRNEN);
++
++ if (hw->tx) {
++ /* Initially fill TX FIFO with as much data as possible */
++ ltq_spi_txfifo_write(hw);
++ irq_flags |= LTQ_SPI_IRNEN_T;
++
++ /* Always enable RX interrupt in Full Duplex mode */
++ if (hw->rx)
++ irq_flags |= LTQ_SPI_IRNEN_R;
++ } else if (hw->rx) {
++ /* Start RX clock */
++ ltq_spi_rxreq_set(hw);
++
++ /* Enable RX interrupt to receive data from RX FIFOs */
++ irq_flags |= LTQ_SPI_IRNEN_R;
++ }
++
++ /* Enable TX or RX interrupts */
++ ltq_spi_reg_setbit(hw, irq_flags, LTQ_SPI_IRNEN);
++ wait_for_completion_interruptible(&hw->done);
++
++ /* Disable all interrupts */
++ ltq_spi_reg_clearbit(hw, LTQ_SPI_IRNEN_ALL, LTQ_SPI_IRNEN);
++
++ /*
++ * Return length of current transfer for bitbang utility code if
++ * no errors occured during transmission.
++ */
++ if (!hw->status)
++ hw->status = hw->len;
++
++ return hw->status;
++}
++
++static const struct ltq_spi_irq_map {
++ char *name;
++ irq_handler_t handler;
++} ltq_spi_irqs[] = {
++ { "spi_rx", ltq_spi_rx_irq },
++ { "spi_tx", ltq_spi_tx_irq },
++ { "spi_err", ltq_spi_err_irq },
++};
++
++static int ltq_spi_probe(struct platform_device *pdev)
++{
++ struct resource irqres[3];
++ struct spi_master *master;
++ struct resource *r;
++ struct ltq_spi *hw;
++ int ret, i;
++ u32 data, id;
++
++ if (of_irq_to_resource_table(pdev->dev.of_node, irqres, 3) != 3) {
++ dev_err(&pdev->dev, "IRQ settings missing in device tree\n");
++ return -EINVAL;
++ }
++
++ master = spi_alloc_master(&pdev->dev, sizeof(struct ltq_spi));
++ if (!master) {
++ dev_err(&pdev->dev, "spi_alloc_master\n");
++ ret = -ENOMEM;
++ goto err;
++ }
++
++ hw = spi_master_get_devdata(master);
++
++ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++ if (r == NULL) {
++ dev_err(&pdev->dev, "platform_get_resource\n");
++ ret = -ENOENT;
++ goto err_master;
++ }
++
++ r = devm_request_mem_region(&pdev->dev, r->start, resource_size(r),
++ pdev->name);
++ if (!r) {
++ dev_err(&pdev->dev, "failed to request memory region\n");
++ ret = -ENXIO;
++ goto err_master;
++ }
++
++ hw->base = devm_ioremap_nocache(&pdev->dev, r->start, resource_size(r));
++ if (!hw->base) {
++ dev_err(&pdev->dev, "failed to remap memory region\n");
++ ret = -ENXIO;
++ goto err_master;
++ }
++
++ memset(hw->irq, 0, sizeof(hw->irq));
++ for (i = 0; i < ARRAY_SIZE(ltq_spi_irqs); i++) {
++ hw->irq[i] = irqres[i].start;
++ ret = request_irq(hw->irq[i], ltq_spi_irqs[i].handler,
++ 0, ltq_spi_irqs[i].name, hw);
++ if (ret) {
++ dev_err(&pdev->dev, "failed to request %s irq (%d)\n",
++ ltq_spi_irqs[i].name, hw->irq[i]);
++ goto err_irq;
++ }
++ }
++
++ hw->fpiclk = clk_get_fpi();
++ if (IS_ERR(hw->fpiclk)) {
++ dev_err(&pdev->dev, "failed to get fpi clock\n");
++ ret = PTR_ERR(hw->fpiclk);
++ goto err_clk;
++ }
++
++ hw->spiclk = clk_get(&pdev->dev, NULL);
++ if (IS_ERR(hw->spiclk)) {
++ dev_err(&pdev->dev, "failed to get spi clock gate\n");
++ ret = PTR_ERR(hw->spiclk);
++ goto err_clk;
++ }
++
++ hw->bitbang.master = spi_master_get(master);
++ hw->bitbang.chipselect = ltq_spi_chipselect;
++ hw->bitbang.setup_transfer = ltq_spi_setup_transfer;
++ hw->bitbang.txrx_bufs = ltq_spi_txrx_bufs;
++
++ if (of_machine_is_compatible("lantiq,ase"))
++ master->num_chipselect = 3;
++ else
++ master->num_chipselect = 6;
++ master->bus_num = pdev->id;
++ master->setup = ltq_spi_setup;
++ master->cleanup = ltq_spi_cleanup;
++ master->dev.of_node = pdev->dev.of_node;
++
++ hw->dev = &pdev->dev;
++ init_completion(&hw->done);
++ spin_lock_init(&hw->lock);
++
++ ltq_spi_hw_enable(hw);
++
++ /* Read module capabilities */
++ id = ltq_spi_reg_read(hw, LTQ_SPI_ID);
++ hw->txfs = (id >> LTQ_SPI_ID_TXFS_SHIFT) & LTQ_SPI_ID_TXFS_MASK;
++ hw->rxfs = (id >> LTQ_SPI_ID_RXFS_SHIFT) & LTQ_SPI_ID_RXFS_MASK;
++ hw->dma_support = (id & LTQ_SPI_ID_CFG) ? 1 : 0;
++
++ ltq_spi_config_mode_set(hw);
++
++ /* Enable error checking, disable TX/RX, set idle value high */
++ data = LTQ_SPI_CON_RUEN | LTQ_SPI_CON_AEN |
++ LTQ_SPI_CON_TEN | LTQ_SPI_CON_REN |
++ LTQ_SPI_CON_TXOFF | LTQ_SPI_CON_RXOFF | LTQ_SPI_CON_IDLE;
++ ltq_spi_reg_write(hw, data, LTQ_SPI_CON);
++
++ /* Enable master mode and clear error flags */
++ ltq_spi_reg_write(hw, LTQ_SPI_WHBSTATE_SETMS |
++ LTQ_SPI_WHBSTATE_CLR_ERRORS, LTQ_SPI_WHBSTATE);
++
++ /* Reset GPIO/CS registers */
++ ltq_spi_reg_write(hw, 0x0, LTQ_SPI_GPOCON);
++ ltq_spi_reg_write(hw, 0xFF00, LTQ_SPI_FGPO);
++
++ /* Enable and flush FIFOs */
++ ltq_spi_reset_fifos(hw);
++
++ ret = spi_bitbang_start(&hw->bitbang);
++ if (ret) {
++ dev_err(&pdev->dev, "spi_bitbang_start failed\n");
++ goto err_bitbang;
++ }
++
++ platform_set_drvdata(pdev, hw);
++
++ pr_info("Lantiq SoC SPI controller rev %u (TXFS %u, RXFS %u, DMA %u)\n",
++ id & LTQ_SPI_ID_REV_MASK, hw->txfs, hw->rxfs, hw->dma_support);
++
++ return 0;
++
++err_bitbang:
++ ltq_spi_hw_disable(hw);
++
++err_clk:
++ if (hw->fpiclk)
++ clk_put(hw->fpiclk);
++ if (hw->spiclk)
++ clk_put(hw->spiclk);
++
++err_irq:
++ clk_put(hw->fpiclk);
++
++ for (; i > 0; i--)
++ free_irq(hw->irq[i], hw);
++
++err_master:
++ spi_master_put(master);
++
++err:
++ return ret;
++}
++
++static int ltq_spi_remove(struct platform_device *pdev)
++{
++ struct ltq_spi *hw = platform_get_drvdata(pdev);
++ int i;
++
++ spi_bitbang_stop(&hw->bitbang);
++
++ platform_set_drvdata(pdev, NULL);
++
++ ltq_spi_config_mode_set(hw);
++ ltq_spi_hw_disable(hw);
++
++ for (i = 0; i < ARRAY_SIZE(hw->irq); i++)
++ if (0 < hw->irq[i])
++ free_irq(hw->irq[i], hw);
++
++ if (hw->fpiclk)
++ clk_put(hw->fpiclk);
++ if (hw->spiclk)
++ clk_put(hw->spiclk);
++
++ spi_master_put(hw->bitbang.master);
++
++ return 0;
++}
++
++static const struct of_device_id ltq_spi_match[] = {
++ { .compatible = "lantiq,spi-xway" },
++ {},
++};
++MODULE_DEVICE_TABLE(of, ltq_spi_match);
++
++static struct platform_driver ltq_spi_driver = {
++ .probe = ltq_spi_probe,
++ .remove = ltq_spi_remove,
++ .driver = {
++ .name = "spi-xway",
++ .owner = THIS_MODULE,
++ .of_match_table = ltq_spi_match,
++ },
++};
++
++module_platform_driver(ltq_spi_driver);
++
++MODULE_DESCRIPTION("Lantiq SoC SPI controller driver");
++MODULE_AUTHOR("Daniel Schwierzeck <daniel.schwierzeck@googlemail.com>");
++MODULE_LICENSE("GPL");
++MODULE_ALIAS("platform:spi-xway");
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-09 03:00:23 +0000