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27fb2313f2
Set use_gpio_descriptors to true and avoid asserting the native chip select if the spi core has done it for us. Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz> Link: https://lore.kernel.org/r/20191107044235.4864-2-chris.packham@alliedtelesis.co.nz Signed-off-by: Mark Brown <broonie@kernel.org>
1443 lines
36 KiB
C
1443 lines
36 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Driver for Broadcom BRCMSTB, NSP, NS2, Cygnus SPI Controllers
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*
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* Copyright 2016 Broadcom
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*/
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/spi/spi.h>
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#include <linux/spi/spi-mem.h>
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#include <linux/sysfs.h>
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#include <linux/types.h>
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#include "spi-bcm-qspi.h"
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#define DRIVER_NAME "bcm_qspi"
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/* BSPI register offsets */
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#define BSPI_REVISION_ID 0x000
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#define BSPI_SCRATCH 0x004
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#define BSPI_MAST_N_BOOT_CTRL 0x008
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#define BSPI_BUSY_STATUS 0x00c
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#define BSPI_INTR_STATUS 0x010
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#define BSPI_B0_STATUS 0x014
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#define BSPI_B0_CTRL 0x018
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#define BSPI_B1_STATUS 0x01c
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#define BSPI_B1_CTRL 0x020
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#define BSPI_STRAP_OVERRIDE_CTRL 0x024
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#define BSPI_FLEX_MODE_ENABLE 0x028
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#define BSPI_BITS_PER_CYCLE 0x02c
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#define BSPI_BITS_PER_PHASE 0x030
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#define BSPI_CMD_AND_MODE_BYTE 0x034
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#define BSPI_BSPI_FLASH_UPPER_ADDR_BYTE 0x038
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#define BSPI_BSPI_XOR_VALUE 0x03c
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#define BSPI_BSPI_XOR_ENABLE 0x040
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#define BSPI_BSPI_PIO_MODE_ENABLE 0x044
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#define BSPI_BSPI_PIO_IODIR 0x048
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#define BSPI_BSPI_PIO_DATA 0x04c
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/* RAF register offsets */
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#define BSPI_RAF_START_ADDR 0x100
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#define BSPI_RAF_NUM_WORDS 0x104
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#define BSPI_RAF_CTRL 0x108
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#define BSPI_RAF_FULLNESS 0x10c
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#define BSPI_RAF_WATERMARK 0x110
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#define BSPI_RAF_STATUS 0x114
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#define BSPI_RAF_READ_DATA 0x118
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#define BSPI_RAF_WORD_CNT 0x11c
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#define BSPI_RAF_CURR_ADDR 0x120
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/* Override mode masks */
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#define BSPI_STRAP_OVERRIDE_CTRL_OVERRIDE BIT(0)
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#define BSPI_STRAP_OVERRIDE_CTRL_DATA_DUAL BIT(1)
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#define BSPI_STRAP_OVERRIDE_CTRL_ADDR_4BYTE BIT(2)
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#define BSPI_STRAP_OVERRIDE_CTRL_DATA_QUAD BIT(3)
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#define BSPI_STRAP_OVERRIDE_CTRL_ENDAIN_MODE BIT(4)
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#define BSPI_ADDRLEN_3BYTES 3
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#define BSPI_ADDRLEN_4BYTES 4
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#define BSPI_RAF_STATUS_FIFO_EMPTY_MASK BIT(1)
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#define BSPI_RAF_CTRL_START_MASK BIT(0)
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#define BSPI_RAF_CTRL_CLEAR_MASK BIT(1)
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#define BSPI_BPP_MODE_SELECT_MASK BIT(8)
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#define BSPI_BPP_ADDR_SELECT_MASK BIT(16)
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#define BSPI_READ_LENGTH 256
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/* MSPI register offsets */
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#define MSPI_SPCR0_LSB 0x000
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#define MSPI_SPCR0_MSB 0x004
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#define MSPI_SPCR1_LSB 0x008
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#define MSPI_SPCR1_MSB 0x00c
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#define MSPI_NEWQP 0x010
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#define MSPI_ENDQP 0x014
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#define MSPI_SPCR2 0x018
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#define MSPI_MSPI_STATUS 0x020
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#define MSPI_CPTQP 0x024
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#define MSPI_SPCR3 0x028
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#define MSPI_TXRAM 0x040
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#define MSPI_RXRAM 0x0c0
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#define MSPI_CDRAM 0x140
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#define MSPI_WRITE_LOCK 0x180
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#define MSPI_MASTER_BIT BIT(7)
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#define MSPI_NUM_CDRAM 16
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#define MSPI_CDRAM_CONT_BIT BIT(7)
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#define MSPI_CDRAM_BITSE_BIT BIT(6)
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#define MSPI_CDRAM_PCS 0xf
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#define MSPI_SPCR2_SPE BIT(6)
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#define MSPI_SPCR2_CONT_AFTER_CMD BIT(7)
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#define MSPI_MSPI_STATUS_SPIF BIT(0)
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#define INTR_BASE_BIT_SHIFT 0x02
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#define INTR_COUNT 0x07
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#define NUM_CHIPSELECT 4
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#define QSPI_SPBR_MIN 8U
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#define QSPI_SPBR_MAX 255U
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#define OPCODE_DIOR 0xBB
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#define OPCODE_QIOR 0xEB
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#define OPCODE_DIOR_4B 0xBC
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#define OPCODE_QIOR_4B 0xEC
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#define MAX_CMD_SIZE 6
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#define ADDR_4MB_MASK GENMASK(22, 0)
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/* stop at end of transfer, no other reason */
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#define TRANS_STATUS_BREAK_NONE 0
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/* stop at end of spi_message */
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#define TRANS_STATUS_BREAK_EOM 1
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/* stop at end of spi_transfer if delay */
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#define TRANS_STATUS_BREAK_DELAY 2
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/* stop at end of spi_transfer if cs_change */
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#define TRANS_STATUS_BREAK_CS_CHANGE 4
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/* stop if we run out of bytes */
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#define TRANS_STATUS_BREAK_NO_BYTES 8
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/* events that make us stop filling TX slots */
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#define TRANS_STATUS_BREAK_TX (TRANS_STATUS_BREAK_EOM | \
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TRANS_STATUS_BREAK_DELAY | \
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TRANS_STATUS_BREAK_CS_CHANGE)
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/* events that make us deassert CS */
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#define TRANS_STATUS_BREAK_DESELECT (TRANS_STATUS_BREAK_EOM | \
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TRANS_STATUS_BREAK_CS_CHANGE)
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struct bcm_qspi_parms {
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u32 speed_hz;
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u8 mode;
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u8 bits_per_word;
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};
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struct bcm_xfer_mode {
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bool flex_mode;
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unsigned int width;
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unsigned int addrlen;
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unsigned int hp;
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};
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enum base_type {
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MSPI,
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BSPI,
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CHIP_SELECT,
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BASEMAX,
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};
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enum irq_source {
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SINGLE_L2,
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MUXED_L1,
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};
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struct bcm_qspi_irq {
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const char *irq_name;
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const irq_handler_t irq_handler;
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int irq_source;
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u32 mask;
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};
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struct bcm_qspi_dev_id {
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const struct bcm_qspi_irq *irqp;
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void *dev;
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};
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struct qspi_trans {
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struct spi_transfer *trans;
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int byte;
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bool mspi_last_trans;
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};
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struct bcm_qspi {
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struct platform_device *pdev;
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struct spi_master *master;
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struct clk *clk;
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u32 base_clk;
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u32 max_speed_hz;
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void __iomem *base[BASEMAX];
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/* Some SoCs provide custom interrupt status register(s) */
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struct bcm_qspi_soc_intc *soc_intc;
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struct bcm_qspi_parms last_parms;
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struct qspi_trans trans_pos;
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int curr_cs;
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int bspi_maj_rev;
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int bspi_min_rev;
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int bspi_enabled;
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const struct spi_mem_op *bspi_rf_op;
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u32 bspi_rf_op_idx;
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u32 bspi_rf_op_len;
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u32 bspi_rf_op_status;
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struct bcm_xfer_mode xfer_mode;
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u32 s3_strap_override_ctrl;
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bool bspi_mode;
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bool big_endian;
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int num_irqs;
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struct bcm_qspi_dev_id *dev_ids;
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struct completion mspi_done;
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struct completion bspi_done;
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};
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static inline bool has_bspi(struct bcm_qspi *qspi)
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{
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return qspi->bspi_mode;
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}
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/* Read qspi controller register*/
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static inline u32 bcm_qspi_read(struct bcm_qspi *qspi, enum base_type type,
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unsigned int offset)
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{
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return bcm_qspi_readl(qspi->big_endian, qspi->base[type] + offset);
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}
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/* Write qspi controller register*/
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static inline void bcm_qspi_write(struct bcm_qspi *qspi, enum base_type type,
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unsigned int offset, unsigned int data)
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{
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bcm_qspi_writel(qspi->big_endian, data, qspi->base[type] + offset);
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}
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/* BSPI helpers */
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static int bcm_qspi_bspi_busy_poll(struct bcm_qspi *qspi)
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{
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int i;
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/* this should normally finish within 10us */
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for (i = 0; i < 1000; i++) {
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if (!(bcm_qspi_read(qspi, BSPI, BSPI_BUSY_STATUS) & 1))
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return 0;
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udelay(1);
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}
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dev_warn(&qspi->pdev->dev, "timeout waiting for !busy_status\n");
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return -EIO;
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}
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static inline bool bcm_qspi_bspi_ver_three(struct bcm_qspi *qspi)
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{
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if (qspi->bspi_maj_rev < 4)
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return true;
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return false;
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}
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static void bcm_qspi_bspi_flush_prefetch_buffers(struct bcm_qspi *qspi)
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{
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bcm_qspi_bspi_busy_poll(qspi);
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/* Force rising edge for the b0/b1 'flush' field */
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bcm_qspi_write(qspi, BSPI, BSPI_B0_CTRL, 1);
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bcm_qspi_write(qspi, BSPI, BSPI_B1_CTRL, 1);
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bcm_qspi_write(qspi, BSPI, BSPI_B0_CTRL, 0);
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bcm_qspi_write(qspi, BSPI, BSPI_B1_CTRL, 0);
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}
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static int bcm_qspi_bspi_lr_is_fifo_empty(struct bcm_qspi *qspi)
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{
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return (bcm_qspi_read(qspi, BSPI, BSPI_RAF_STATUS) &
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BSPI_RAF_STATUS_FIFO_EMPTY_MASK);
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}
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static inline u32 bcm_qspi_bspi_lr_read_fifo(struct bcm_qspi *qspi)
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{
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u32 data = bcm_qspi_read(qspi, BSPI, BSPI_RAF_READ_DATA);
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/* BSPI v3 LR is LE only, convert data to host endianness */
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if (bcm_qspi_bspi_ver_three(qspi))
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data = le32_to_cpu(data);
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return data;
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}
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static inline void bcm_qspi_bspi_lr_start(struct bcm_qspi *qspi)
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{
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bcm_qspi_bspi_busy_poll(qspi);
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bcm_qspi_write(qspi, BSPI, BSPI_RAF_CTRL,
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BSPI_RAF_CTRL_START_MASK);
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}
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static inline void bcm_qspi_bspi_lr_clear(struct bcm_qspi *qspi)
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{
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bcm_qspi_write(qspi, BSPI, BSPI_RAF_CTRL,
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BSPI_RAF_CTRL_CLEAR_MASK);
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bcm_qspi_bspi_flush_prefetch_buffers(qspi);
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}
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static void bcm_qspi_bspi_lr_data_read(struct bcm_qspi *qspi)
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{
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u32 *buf = (u32 *)qspi->bspi_rf_op->data.buf.in;
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u32 data = 0;
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dev_dbg(&qspi->pdev->dev, "xfer %p rx %p rxlen %d\n", qspi->bspi_rf_op,
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qspi->bspi_rf_op->data.buf.in, qspi->bspi_rf_op_len);
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while (!bcm_qspi_bspi_lr_is_fifo_empty(qspi)) {
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data = bcm_qspi_bspi_lr_read_fifo(qspi);
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if (likely(qspi->bspi_rf_op_len >= 4) &&
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IS_ALIGNED((uintptr_t)buf, 4)) {
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buf[qspi->bspi_rf_op_idx++] = data;
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qspi->bspi_rf_op_len -= 4;
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} else {
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/* Read out remaining bytes, make sure*/
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u8 *cbuf = (u8 *)&buf[qspi->bspi_rf_op_idx];
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data = cpu_to_le32(data);
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while (qspi->bspi_rf_op_len) {
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*cbuf++ = (u8)data;
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data >>= 8;
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qspi->bspi_rf_op_len--;
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}
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}
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}
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}
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static void bcm_qspi_bspi_set_xfer_params(struct bcm_qspi *qspi, u8 cmd_byte,
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int bpp, int bpc, int flex_mode)
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{
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bcm_qspi_write(qspi, BSPI, BSPI_FLEX_MODE_ENABLE, 0);
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bcm_qspi_write(qspi, BSPI, BSPI_BITS_PER_CYCLE, bpc);
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bcm_qspi_write(qspi, BSPI, BSPI_BITS_PER_PHASE, bpp);
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bcm_qspi_write(qspi, BSPI, BSPI_CMD_AND_MODE_BYTE, cmd_byte);
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bcm_qspi_write(qspi, BSPI, BSPI_FLEX_MODE_ENABLE, flex_mode);
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}
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static int bcm_qspi_bspi_set_flex_mode(struct bcm_qspi *qspi,
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const struct spi_mem_op *op, int hp)
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{
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int bpc = 0, bpp = 0;
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u8 command = op->cmd.opcode;
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int width = op->data.buswidth ? op->data.buswidth : SPI_NBITS_SINGLE;
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int addrlen = op->addr.nbytes;
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int flex_mode = 1;
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dev_dbg(&qspi->pdev->dev, "set flex mode w %x addrlen %x hp %d\n",
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width, addrlen, hp);
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if (addrlen == BSPI_ADDRLEN_4BYTES)
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bpp = BSPI_BPP_ADDR_SELECT_MASK;
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bpp |= (op->dummy.nbytes * 8) / op->dummy.buswidth;
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switch (width) {
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case SPI_NBITS_SINGLE:
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if (addrlen == BSPI_ADDRLEN_3BYTES)
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/* default mode, does not need flex_cmd */
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flex_mode = 0;
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break;
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case SPI_NBITS_DUAL:
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bpc = 0x00000001;
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if (hp) {
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bpc |= 0x00010100; /* address and mode are 2-bit */
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bpp = BSPI_BPP_MODE_SELECT_MASK;
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}
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break;
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case SPI_NBITS_QUAD:
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bpc = 0x00000002;
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if (hp) {
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bpc |= 0x00020200; /* address and mode are 4-bit */
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bpp |= BSPI_BPP_MODE_SELECT_MASK;
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}
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break;
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default:
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return -EINVAL;
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}
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bcm_qspi_bspi_set_xfer_params(qspi, command, bpp, bpc, flex_mode);
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return 0;
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}
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static int bcm_qspi_bspi_set_override(struct bcm_qspi *qspi,
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const struct spi_mem_op *op, int hp)
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{
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int width = op->data.buswidth ? op->data.buswidth : SPI_NBITS_SINGLE;
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int addrlen = op->addr.nbytes;
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u32 data = bcm_qspi_read(qspi, BSPI, BSPI_STRAP_OVERRIDE_CTRL);
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dev_dbg(&qspi->pdev->dev, "set override mode w %x addrlen %x hp %d\n",
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width, addrlen, hp);
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switch (width) {
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case SPI_NBITS_SINGLE:
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/* clear quad/dual mode */
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data &= ~(BSPI_STRAP_OVERRIDE_CTRL_DATA_QUAD |
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BSPI_STRAP_OVERRIDE_CTRL_DATA_DUAL);
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break;
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case SPI_NBITS_QUAD:
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/* clear dual mode and set quad mode */
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data &= ~BSPI_STRAP_OVERRIDE_CTRL_DATA_DUAL;
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data |= BSPI_STRAP_OVERRIDE_CTRL_DATA_QUAD;
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break;
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case SPI_NBITS_DUAL:
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/* clear quad mode set dual mode */
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data &= ~BSPI_STRAP_OVERRIDE_CTRL_DATA_QUAD;
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data |= BSPI_STRAP_OVERRIDE_CTRL_DATA_DUAL;
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break;
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default:
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return -EINVAL;
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}
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if (addrlen == BSPI_ADDRLEN_4BYTES)
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/* set 4byte mode*/
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data |= BSPI_STRAP_OVERRIDE_CTRL_ADDR_4BYTE;
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else
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/* clear 4 byte mode */
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data &= ~BSPI_STRAP_OVERRIDE_CTRL_ADDR_4BYTE;
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/* set the override mode */
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data |= BSPI_STRAP_OVERRIDE_CTRL_OVERRIDE;
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bcm_qspi_write(qspi, BSPI, BSPI_STRAP_OVERRIDE_CTRL, data);
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bcm_qspi_bspi_set_xfer_params(qspi, op->cmd.opcode, 0, 0, 0);
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return 0;
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}
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static int bcm_qspi_bspi_set_mode(struct bcm_qspi *qspi,
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const struct spi_mem_op *op, int hp)
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{
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int error = 0;
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int width = op->data.buswidth ? op->data.buswidth : SPI_NBITS_SINGLE;
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int addrlen = op->addr.nbytes;
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/* default mode */
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qspi->xfer_mode.flex_mode = true;
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if (!bcm_qspi_bspi_ver_three(qspi)) {
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u32 val, mask;
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val = bcm_qspi_read(qspi, BSPI, BSPI_STRAP_OVERRIDE_CTRL);
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mask = BSPI_STRAP_OVERRIDE_CTRL_OVERRIDE;
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if (val & mask || qspi->s3_strap_override_ctrl & mask) {
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qspi->xfer_mode.flex_mode = false;
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bcm_qspi_write(qspi, BSPI, BSPI_FLEX_MODE_ENABLE, 0);
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error = bcm_qspi_bspi_set_override(qspi, op, hp);
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}
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}
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if (qspi->xfer_mode.flex_mode)
|
|
error = bcm_qspi_bspi_set_flex_mode(qspi, op, hp);
|
|
|
|
if (error) {
|
|
dev_warn(&qspi->pdev->dev,
|
|
"INVALID COMBINATION: width=%d addrlen=%d hp=%d\n",
|
|
width, addrlen, hp);
|
|
} else if (qspi->xfer_mode.width != width ||
|
|
qspi->xfer_mode.addrlen != addrlen ||
|
|
qspi->xfer_mode.hp != hp) {
|
|
qspi->xfer_mode.width = width;
|
|
qspi->xfer_mode.addrlen = addrlen;
|
|
qspi->xfer_mode.hp = hp;
|
|
dev_dbg(&qspi->pdev->dev,
|
|
"cs:%d %d-lane output, %d-byte address%s\n",
|
|
qspi->curr_cs,
|
|
qspi->xfer_mode.width,
|
|
qspi->xfer_mode.addrlen,
|
|
qspi->xfer_mode.hp != -1 ? ", hp mode" : "");
|
|
}
|
|
|
|
return error;
|
|
}
|
|
|
|
static void bcm_qspi_enable_bspi(struct bcm_qspi *qspi)
|
|
{
|
|
if (!has_bspi(qspi))
|
|
return;
|
|
|
|
qspi->bspi_enabled = 1;
|
|
if ((bcm_qspi_read(qspi, BSPI, BSPI_MAST_N_BOOT_CTRL) & 1) == 0)
|
|
return;
|
|
|
|
bcm_qspi_bspi_flush_prefetch_buffers(qspi);
|
|
udelay(1);
|
|
bcm_qspi_write(qspi, BSPI, BSPI_MAST_N_BOOT_CTRL, 0);
|
|
udelay(1);
|
|
}
|
|
|
|
static void bcm_qspi_disable_bspi(struct bcm_qspi *qspi)
|
|
{
|
|
if (!has_bspi(qspi))
|
|
return;
|
|
|
|
qspi->bspi_enabled = 0;
|
|
if ((bcm_qspi_read(qspi, BSPI, BSPI_MAST_N_BOOT_CTRL) & 1))
|
|
return;
|
|
|
|
bcm_qspi_bspi_busy_poll(qspi);
|
|
bcm_qspi_write(qspi, BSPI, BSPI_MAST_N_BOOT_CTRL, 1);
|
|
udelay(1);
|
|
}
|
|
|
|
static void bcm_qspi_chip_select(struct bcm_qspi *qspi, int cs)
|
|
{
|
|
u32 rd = 0;
|
|
u32 wr = 0;
|
|
|
|
if (qspi->base[CHIP_SELECT]) {
|
|
rd = bcm_qspi_read(qspi, CHIP_SELECT, 0);
|
|
wr = (rd & ~0xff) | (1 << cs);
|
|
if (rd == wr)
|
|
return;
|
|
bcm_qspi_write(qspi, CHIP_SELECT, 0, wr);
|
|
usleep_range(10, 20);
|
|
}
|
|
|
|
dev_dbg(&qspi->pdev->dev, "using cs:%d\n", cs);
|
|
qspi->curr_cs = cs;
|
|
}
|
|
|
|
/* MSPI helpers */
|
|
static void bcm_qspi_hw_set_parms(struct bcm_qspi *qspi,
|
|
const struct bcm_qspi_parms *xp)
|
|
{
|
|
u32 spcr, spbr = 0;
|
|
|
|
if (xp->speed_hz)
|
|
spbr = qspi->base_clk / (2 * xp->speed_hz);
|
|
|
|
spcr = clamp_val(spbr, QSPI_SPBR_MIN, QSPI_SPBR_MAX);
|
|
bcm_qspi_write(qspi, MSPI, MSPI_SPCR0_LSB, spcr);
|
|
|
|
spcr = MSPI_MASTER_BIT;
|
|
/* for 16 bit the data should be zero */
|
|
if (xp->bits_per_word != 16)
|
|
spcr |= xp->bits_per_word << 2;
|
|
spcr |= xp->mode & 3;
|
|
bcm_qspi_write(qspi, MSPI, MSPI_SPCR0_MSB, spcr);
|
|
|
|
qspi->last_parms = *xp;
|
|
}
|
|
|
|
static void bcm_qspi_update_parms(struct bcm_qspi *qspi,
|
|
struct spi_device *spi,
|
|
struct spi_transfer *trans)
|
|
{
|
|
struct bcm_qspi_parms xp;
|
|
|
|
xp.speed_hz = trans->speed_hz;
|
|
xp.bits_per_word = trans->bits_per_word;
|
|
xp.mode = spi->mode;
|
|
|
|
bcm_qspi_hw_set_parms(qspi, &xp);
|
|
}
|
|
|
|
static int bcm_qspi_setup(struct spi_device *spi)
|
|
{
|
|
struct bcm_qspi_parms *xp;
|
|
|
|
if (spi->bits_per_word > 16)
|
|
return -EINVAL;
|
|
|
|
xp = spi_get_ctldata(spi);
|
|
if (!xp) {
|
|
xp = kzalloc(sizeof(*xp), GFP_KERNEL);
|
|
if (!xp)
|
|
return -ENOMEM;
|
|
spi_set_ctldata(spi, xp);
|
|
}
|
|
xp->speed_hz = spi->max_speed_hz;
|
|
xp->mode = spi->mode;
|
|
|
|
if (spi->bits_per_word)
|
|
xp->bits_per_word = spi->bits_per_word;
|
|
else
|
|
xp->bits_per_word = 8;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool bcm_qspi_mspi_transfer_is_last(struct bcm_qspi *qspi,
|
|
struct qspi_trans *qt)
|
|
{
|
|
if (qt->mspi_last_trans &&
|
|
spi_transfer_is_last(qspi->master, qt->trans))
|
|
return true;
|
|
else
|
|
return false;
|
|
}
|
|
|
|
static int update_qspi_trans_byte_count(struct bcm_qspi *qspi,
|
|
struct qspi_trans *qt, int flags)
|
|
{
|
|
int ret = TRANS_STATUS_BREAK_NONE;
|
|
|
|
/* count the last transferred bytes */
|
|
if (qt->trans->bits_per_word <= 8)
|
|
qt->byte++;
|
|
else
|
|
qt->byte += 2;
|
|
|
|
if (qt->byte >= qt->trans->len) {
|
|
/* we're at the end of the spi_transfer */
|
|
/* in TX mode, need to pause for a delay or CS change */
|
|
if (qt->trans->delay_usecs &&
|
|
(flags & TRANS_STATUS_BREAK_DELAY))
|
|
ret |= TRANS_STATUS_BREAK_DELAY;
|
|
if (qt->trans->cs_change &&
|
|
(flags & TRANS_STATUS_BREAK_CS_CHANGE))
|
|
ret |= TRANS_STATUS_BREAK_CS_CHANGE;
|
|
if (ret)
|
|
goto done;
|
|
|
|
dev_dbg(&qspi->pdev->dev, "advance msg exit\n");
|
|
if (bcm_qspi_mspi_transfer_is_last(qspi, qt))
|
|
ret = TRANS_STATUS_BREAK_EOM;
|
|
else
|
|
ret = TRANS_STATUS_BREAK_NO_BYTES;
|
|
|
|
qt->trans = NULL;
|
|
}
|
|
|
|
done:
|
|
dev_dbg(&qspi->pdev->dev, "trans %p len %d byte %d ret %x\n",
|
|
qt->trans, qt->trans ? qt->trans->len : 0, qt->byte, ret);
|
|
return ret;
|
|
}
|
|
|
|
static inline u8 read_rxram_slot_u8(struct bcm_qspi *qspi, int slot)
|
|
{
|
|
u32 slot_offset = MSPI_RXRAM + (slot << 3) + 0x4;
|
|
|
|
/* mask out reserved bits */
|
|
return bcm_qspi_read(qspi, MSPI, slot_offset) & 0xff;
|
|
}
|
|
|
|
static inline u16 read_rxram_slot_u16(struct bcm_qspi *qspi, int slot)
|
|
{
|
|
u32 reg_offset = MSPI_RXRAM;
|
|
u32 lsb_offset = reg_offset + (slot << 3) + 0x4;
|
|
u32 msb_offset = reg_offset + (slot << 3);
|
|
|
|
return (bcm_qspi_read(qspi, MSPI, lsb_offset) & 0xff) |
|
|
((bcm_qspi_read(qspi, MSPI, msb_offset) & 0xff) << 8);
|
|
}
|
|
|
|
static void read_from_hw(struct bcm_qspi *qspi, int slots)
|
|
{
|
|
struct qspi_trans tp;
|
|
int slot;
|
|
|
|
bcm_qspi_disable_bspi(qspi);
|
|
|
|
if (slots > MSPI_NUM_CDRAM) {
|
|
/* should never happen */
|
|
dev_err(&qspi->pdev->dev, "%s: too many slots!\n", __func__);
|
|
return;
|
|
}
|
|
|
|
tp = qspi->trans_pos;
|
|
|
|
for (slot = 0; slot < slots; slot++) {
|
|
if (tp.trans->bits_per_word <= 8) {
|
|
u8 *buf = tp.trans->rx_buf;
|
|
|
|
if (buf)
|
|
buf[tp.byte] = read_rxram_slot_u8(qspi, slot);
|
|
dev_dbg(&qspi->pdev->dev, "RD %02x\n",
|
|
buf ? buf[tp.byte] : 0xff);
|
|
} else {
|
|
u16 *buf = tp.trans->rx_buf;
|
|
|
|
if (buf)
|
|
buf[tp.byte / 2] = read_rxram_slot_u16(qspi,
|
|
slot);
|
|
dev_dbg(&qspi->pdev->dev, "RD %04x\n",
|
|
buf ? buf[tp.byte] : 0xffff);
|
|
}
|
|
|
|
update_qspi_trans_byte_count(qspi, &tp,
|
|
TRANS_STATUS_BREAK_NONE);
|
|
}
|
|
|
|
qspi->trans_pos = tp;
|
|
}
|
|
|
|
static inline void write_txram_slot_u8(struct bcm_qspi *qspi, int slot,
|
|
u8 val)
|
|
{
|
|
u32 reg_offset = MSPI_TXRAM + (slot << 3);
|
|
|
|
/* mask out reserved bits */
|
|
bcm_qspi_write(qspi, MSPI, reg_offset, val);
|
|
}
|
|
|
|
static inline void write_txram_slot_u16(struct bcm_qspi *qspi, int slot,
|
|
u16 val)
|
|
{
|
|
u32 reg_offset = MSPI_TXRAM;
|
|
u32 msb_offset = reg_offset + (slot << 3);
|
|
u32 lsb_offset = reg_offset + (slot << 3) + 0x4;
|
|
|
|
bcm_qspi_write(qspi, MSPI, msb_offset, (val >> 8));
|
|
bcm_qspi_write(qspi, MSPI, lsb_offset, (val & 0xff));
|
|
}
|
|
|
|
static inline u32 read_cdram_slot(struct bcm_qspi *qspi, int slot)
|
|
{
|
|
return bcm_qspi_read(qspi, MSPI, MSPI_CDRAM + (slot << 2));
|
|
}
|
|
|
|
static inline void write_cdram_slot(struct bcm_qspi *qspi, int slot, u32 val)
|
|
{
|
|
bcm_qspi_write(qspi, MSPI, (MSPI_CDRAM + (slot << 2)), val);
|
|
}
|
|
|
|
/* Return number of slots written */
|
|
static int write_to_hw(struct bcm_qspi *qspi, struct spi_device *spi)
|
|
{
|
|
struct qspi_trans tp;
|
|
int slot = 0, tstatus = 0;
|
|
u32 mspi_cdram = 0;
|
|
|
|
bcm_qspi_disable_bspi(qspi);
|
|
tp = qspi->trans_pos;
|
|
bcm_qspi_update_parms(qspi, spi, tp.trans);
|
|
|
|
/* Run until end of transfer or reached the max data */
|
|
while (!tstatus && slot < MSPI_NUM_CDRAM) {
|
|
if (tp.trans->bits_per_word <= 8) {
|
|
const u8 *buf = tp.trans->tx_buf;
|
|
u8 val = buf ? buf[tp.byte] : 0xff;
|
|
|
|
write_txram_slot_u8(qspi, slot, val);
|
|
dev_dbg(&qspi->pdev->dev, "WR %02x\n", val);
|
|
} else {
|
|
const u16 *buf = tp.trans->tx_buf;
|
|
u16 val = buf ? buf[tp.byte / 2] : 0xffff;
|
|
|
|
write_txram_slot_u16(qspi, slot, val);
|
|
dev_dbg(&qspi->pdev->dev, "WR %04x\n", val);
|
|
}
|
|
mspi_cdram = MSPI_CDRAM_CONT_BIT;
|
|
|
|
if (has_bspi(qspi))
|
|
mspi_cdram &= ~1;
|
|
else
|
|
mspi_cdram |= (~(1 << spi->chip_select) &
|
|
MSPI_CDRAM_PCS);
|
|
|
|
mspi_cdram |= ((tp.trans->bits_per_word <= 8) ? 0 :
|
|
MSPI_CDRAM_BITSE_BIT);
|
|
|
|
write_cdram_slot(qspi, slot, mspi_cdram);
|
|
|
|
tstatus = update_qspi_trans_byte_count(qspi, &tp,
|
|
TRANS_STATUS_BREAK_TX);
|
|
slot++;
|
|
}
|
|
|
|
if (!slot) {
|
|
dev_err(&qspi->pdev->dev, "%s: no data to send?", __func__);
|
|
goto done;
|
|
}
|
|
|
|
dev_dbg(&qspi->pdev->dev, "submitting %d slots\n", slot);
|
|
bcm_qspi_write(qspi, MSPI, MSPI_NEWQP, 0);
|
|
bcm_qspi_write(qspi, MSPI, MSPI_ENDQP, slot - 1);
|
|
|
|
if (tstatus & TRANS_STATUS_BREAK_DESELECT) {
|
|
mspi_cdram = read_cdram_slot(qspi, slot - 1) &
|
|
~MSPI_CDRAM_CONT_BIT;
|
|
write_cdram_slot(qspi, slot - 1, mspi_cdram);
|
|
}
|
|
|
|
if (has_bspi(qspi))
|
|
bcm_qspi_write(qspi, MSPI, MSPI_WRITE_LOCK, 1);
|
|
|
|
/* Must flush previous writes before starting MSPI operation */
|
|
mb();
|
|
/* Set cont | spe | spifie */
|
|
bcm_qspi_write(qspi, MSPI, MSPI_SPCR2, 0xe0);
|
|
|
|
done:
|
|
return slot;
|
|
}
|
|
|
|
static int bcm_qspi_bspi_exec_mem_op(struct spi_device *spi,
|
|
const struct spi_mem_op *op)
|
|
{
|
|
struct bcm_qspi *qspi = spi_master_get_devdata(spi->master);
|
|
u32 addr = 0, len, rdlen, len_words, from = 0;
|
|
int ret = 0;
|
|
unsigned long timeo = msecs_to_jiffies(100);
|
|
struct bcm_qspi_soc_intc *soc_intc = qspi->soc_intc;
|
|
|
|
if (bcm_qspi_bspi_ver_three(qspi))
|
|
if (op->addr.nbytes == BSPI_ADDRLEN_4BYTES)
|
|
return -EIO;
|
|
|
|
from = op->addr.val;
|
|
if (!spi->cs_gpiod)
|
|
bcm_qspi_chip_select(qspi, spi->chip_select);
|
|
bcm_qspi_write(qspi, MSPI, MSPI_WRITE_LOCK, 0);
|
|
|
|
/*
|
|
* when using flex mode we need to send
|
|
* the upper address byte to bspi
|
|
*/
|
|
if (bcm_qspi_bspi_ver_three(qspi) == false) {
|
|
addr = from & 0xff000000;
|
|
bcm_qspi_write(qspi, BSPI,
|
|
BSPI_BSPI_FLASH_UPPER_ADDR_BYTE, addr);
|
|
}
|
|
|
|
if (!qspi->xfer_mode.flex_mode)
|
|
addr = from;
|
|
else
|
|
addr = from & 0x00ffffff;
|
|
|
|
if (bcm_qspi_bspi_ver_three(qspi) == true)
|
|
addr = (addr + 0xc00000) & 0xffffff;
|
|
|
|
/*
|
|
* read into the entire buffer by breaking the reads
|
|
* into RAF buffer read lengths
|
|
*/
|
|
len = op->data.nbytes;
|
|
qspi->bspi_rf_op_idx = 0;
|
|
|
|
do {
|
|
if (len > BSPI_READ_LENGTH)
|
|
rdlen = BSPI_READ_LENGTH;
|
|
else
|
|
rdlen = len;
|
|
|
|
reinit_completion(&qspi->bspi_done);
|
|
bcm_qspi_enable_bspi(qspi);
|
|
len_words = (rdlen + 3) >> 2;
|
|
qspi->bspi_rf_op = op;
|
|
qspi->bspi_rf_op_status = 0;
|
|
qspi->bspi_rf_op_len = rdlen;
|
|
dev_dbg(&qspi->pdev->dev,
|
|
"bspi xfr addr 0x%x len 0x%x", addr, rdlen);
|
|
bcm_qspi_write(qspi, BSPI, BSPI_RAF_START_ADDR, addr);
|
|
bcm_qspi_write(qspi, BSPI, BSPI_RAF_NUM_WORDS, len_words);
|
|
bcm_qspi_write(qspi, BSPI, BSPI_RAF_WATERMARK, 0);
|
|
if (qspi->soc_intc) {
|
|
/*
|
|
* clear soc MSPI and BSPI interrupts and enable
|
|
* BSPI interrupts.
|
|
*/
|
|
soc_intc->bcm_qspi_int_ack(soc_intc, MSPI_BSPI_DONE);
|
|
soc_intc->bcm_qspi_int_set(soc_intc, BSPI_DONE, true);
|
|
}
|
|
|
|
/* Must flush previous writes before starting BSPI operation */
|
|
mb();
|
|
bcm_qspi_bspi_lr_start(qspi);
|
|
if (!wait_for_completion_timeout(&qspi->bspi_done, timeo)) {
|
|
dev_err(&qspi->pdev->dev, "timeout waiting for BSPI\n");
|
|
ret = -ETIMEDOUT;
|
|
break;
|
|
}
|
|
|
|
/* set msg return length */
|
|
addr += rdlen;
|
|
len -= rdlen;
|
|
} while (len);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int bcm_qspi_transfer_one(struct spi_master *master,
|
|
struct spi_device *spi,
|
|
struct spi_transfer *trans)
|
|
{
|
|
struct bcm_qspi *qspi = spi_master_get_devdata(master);
|
|
int slots;
|
|
unsigned long timeo = msecs_to_jiffies(100);
|
|
|
|
if (!spi->cs_gpiod)
|
|
bcm_qspi_chip_select(qspi, spi->chip_select);
|
|
qspi->trans_pos.trans = trans;
|
|
qspi->trans_pos.byte = 0;
|
|
|
|
while (qspi->trans_pos.byte < trans->len) {
|
|
reinit_completion(&qspi->mspi_done);
|
|
|
|
slots = write_to_hw(qspi, spi);
|
|
if (!wait_for_completion_timeout(&qspi->mspi_done, timeo)) {
|
|
dev_err(&qspi->pdev->dev, "timeout waiting for MSPI\n");
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
read_from_hw(qspi, slots);
|
|
}
|
|
bcm_qspi_enable_bspi(qspi);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bcm_qspi_mspi_exec_mem_op(struct spi_device *spi,
|
|
const struct spi_mem_op *op)
|
|
{
|
|
struct spi_master *master = spi->master;
|
|
struct bcm_qspi *qspi = spi_master_get_devdata(master);
|
|
struct spi_transfer t[2];
|
|
u8 cmd[6] = { };
|
|
int ret, i;
|
|
|
|
memset(cmd, 0, sizeof(cmd));
|
|
memset(t, 0, sizeof(t));
|
|
|
|
/* tx */
|
|
/* opcode is in cmd[0] */
|
|
cmd[0] = op->cmd.opcode;
|
|
for (i = 0; i < op->addr.nbytes; i++)
|
|
cmd[1 + i] = op->addr.val >> (8 * (op->addr.nbytes - i - 1));
|
|
|
|
t[0].tx_buf = cmd;
|
|
t[0].len = op->addr.nbytes + op->dummy.nbytes + 1;
|
|
t[0].bits_per_word = spi->bits_per_word;
|
|
t[0].tx_nbits = op->cmd.buswidth;
|
|
/* lets mspi know that this is not last transfer */
|
|
qspi->trans_pos.mspi_last_trans = false;
|
|
ret = bcm_qspi_transfer_one(master, spi, &t[0]);
|
|
|
|
/* rx */
|
|
qspi->trans_pos.mspi_last_trans = true;
|
|
if (!ret) {
|
|
/* rx */
|
|
t[1].rx_buf = op->data.buf.in;
|
|
t[1].len = op->data.nbytes;
|
|
t[1].rx_nbits = op->data.buswidth;
|
|
t[1].bits_per_word = spi->bits_per_word;
|
|
ret = bcm_qspi_transfer_one(master, spi, &t[1]);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int bcm_qspi_exec_mem_op(struct spi_mem *mem,
|
|
const struct spi_mem_op *op)
|
|
{
|
|
struct spi_device *spi = mem->spi;
|
|
struct bcm_qspi *qspi = spi_master_get_devdata(spi->master);
|
|
int ret = 0;
|
|
bool mspi_read = false;
|
|
u32 addr = 0, len;
|
|
u_char *buf;
|
|
|
|
if (!op->data.nbytes || !op->addr.nbytes || op->addr.nbytes > 4 ||
|
|
op->data.dir != SPI_MEM_DATA_IN)
|
|
return -ENOTSUPP;
|
|
|
|
buf = op->data.buf.in;
|
|
addr = op->addr.val;
|
|
len = op->data.nbytes;
|
|
|
|
if (bcm_qspi_bspi_ver_three(qspi) == true) {
|
|
/*
|
|
* The address coming into this function is a raw flash offset.
|
|
* But for BSPI <= V3, we need to convert it to a remapped BSPI
|
|
* address. If it crosses a 4MB boundary, just revert back to
|
|
* using MSPI.
|
|
*/
|
|
addr = (addr + 0xc00000) & 0xffffff;
|
|
|
|
if ((~ADDR_4MB_MASK & addr) ^
|
|
(~ADDR_4MB_MASK & (addr + len - 1)))
|
|
mspi_read = true;
|
|
}
|
|
|
|
/* non-aligned and very short transfers are handled by MSPI */
|
|
if (!IS_ALIGNED((uintptr_t)addr, 4) || !IS_ALIGNED((uintptr_t)buf, 4) ||
|
|
len < 4)
|
|
mspi_read = true;
|
|
|
|
if (mspi_read)
|
|
return bcm_qspi_mspi_exec_mem_op(spi, op);
|
|
|
|
ret = bcm_qspi_bspi_set_mode(qspi, op, 0);
|
|
|
|
if (!ret)
|
|
ret = bcm_qspi_bspi_exec_mem_op(spi, op);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void bcm_qspi_cleanup(struct spi_device *spi)
|
|
{
|
|
struct bcm_qspi_parms *xp = spi_get_ctldata(spi);
|
|
|
|
kfree(xp);
|
|
}
|
|
|
|
static irqreturn_t bcm_qspi_mspi_l2_isr(int irq, void *dev_id)
|
|
{
|
|
struct bcm_qspi_dev_id *qspi_dev_id = dev_id;
|
|
struct bcm_qspi *qspi = qspi_dev_id->dev;
|
|
u32 status = bcm_qspi_read(qspi, MSPI, MSPI_MSPI_STATUS);
|
|
|
|
if (status & MSPI_MSPI_STATUS_SPIF) {
|
|
struct bcm_qspi_soc_intc *soc_intc = qspi->soc_intc;
|
|
/* clear interrupt */
|
|
status &= ~MSPI_MSPI_STATUS_SPIF;
|
|
bcm_qspi_write(qspi, MSPI, MSPI_MSPI_STATUS, status);
|
|
if (qspi->soc_intc)
|
|
soc_intc->bcm_qspi_int_ack(soc_intc, MSPI_DONE);
|
|
complete(&qspi->mspi_done);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
return IRQ_NONE;
|
|
}
|
|
|
|
static irqreturn_t bcm_qspi_bspi_lr_l2_isr(int irq, void *dev_id)
|
|
{
|
|
struct bcm_qspi_dev_id *qspi_dev_id = dev_id;
|
|
struct bcm_qspi *qspi = qspi_dev_id->dev;
|
|
struct bcm_qspi_soc_intc *soc_intc = qspi->soc_intc;
|
|
u32 status = qspi_dev_id->irqp->mask;
|
|
|
|
if (qspi->bspi_enabled && qspi->bspi_rf_op) {
|
|
bcm_qspi_bspi_lr_data_read(qspi);
|
|
if (qspi->bspi_rf_op_len == 0) {
|
|
qspi->bspi_rf_op = NULL;
|
|
if (qspi->soc_intc) {
|
|
/* disable soc BSPI interrupt */
|
|
soc_intc->bcm_qspi_int_set(soc_intc, BSPI_DONE,
|
|
false);
|
|
/* indicate done */
|
|
status = INTR_BSPI_LR_SESSION_DONE_MASK;
|
|
}
|
|
|
|
if (qspi->bspi_rf_op_status)
|
|
bcm_qspi_bspi_lr_clear(qspi);
|
|
else
|
|
bcm_qspi_bspi_flush_prefetch_buffers(qspi);
|
|
}
|
|
|
|
if (qspi->soc_intc)
|
|
/* clear soc BSPI interrupt */
|
|
soc_intc->bcm_qspi_int_ack(soc_intc, BSPI_DONE);
|
|
}
|
|
|
|
status &= INTR_BSPI_LR_SESSION_DONE_MASK;
|
|
if (qspi->bspi_enabled && status && qspi->bspi_rf_op_len == 0)
|
|
complete(&qspi->bspi_done);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t bcm_qspi_bspi_lr_err_l2_isr(int irq, void *dev_id)
|
|
{
|
|
struct bcm_qspi_dev_id *qspi_dev_id = dev_id;
|
|
struct bcm_qspi *qspi = qspi_dev_id->dev;
|
|
struct bcm_qspi_soc_intc *soc_intc = qspi->soc_intc;
|
|
|
|
dev_err(&qspi->pdev->dev, "BSPI INT error\n");
|
|
qspi->bspi_rf_op_status = -EIO;
|
|
if (qspi->soc_intc)
|
|
/* clear soc interrupt */
|
|
soc_intc->bcm_qspi_int_ack(soc_intc, BSPI_ERR);
|
|
|
|
complete(&qspi->bspi_done);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t bcm_qspi_l1_isr(int irq, void *dev_id)
|
|
{
|
|
struct bcm_qspi_dev_id *qspi_dev_id = dev_id;
|
|
struct bcm_qspi *qspi = qspi_dev_id->dev;
|
|
struct bcm_qspi_soc_intc *soc_intc = qspi->soc_intc;
|
|
irqreturn_t ret = IRQ_NONE;
|
|
|
|
if (soc_intc) {
|
|
u32 status = soc_intc->bcm_qspi_get_int_status(soc_intc);
|
|
|
|
if (status & MSPI_DONE)
|
|
ret = bcm_qspi_mspi_l2_isr(irq, dev_id);
|
|
else if (status & BSPI_DONE)
|
|
ret = bcm_qspi_bspi_lr_l2_isr(irq, dev_id);
|
|
else if (status & BSPI_ERR)
|
|
ret = bcm_qspi_bspi_lr_err_l2_isr(irq, dev_id);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct bcm_qspi_irq qspi_irq_tab[] = {
|
|
{
|
|
.irq_name = "spi_lr_fullness_reached",
|
|
.irq_handler = bcm_qspi_bspi_lr_l2_isr,
|
|
.mask = INTR_BSPI_LR_FULLNESS_REACHED_MASK,
|
|
},
|
|
{
|
|
.irq_name = "spi_lr_session_aborted",
|
|
.irq_handler = bcm_qspi_bspi_lr_err_l2_isr,
|
|
.mask = INTR_BSPI_LR_SESSION_ABORTED_MASK,
|
|
},
|
|
{
|
|
.irq_name = "spi_lr_impatient",
|
|
.irq_handler = bcm_qspi_bspi_lr_err_l2_isr,
|
|
.mask = INTR_BSPI_LR_IMPATIENT_MASK,
|
|
},
|
|
{
|
|
.irq_name = "spi_lr_session_done",
|
|
.irq_handler = bcm_qspi_bspi_lr_l2_isr,
|
|
.mask = INTR_BSPI_LR_SESSION_DONE_MASK,
|
|
},
|
|
#ifdef QSPI_INT_DEBUG
|
|
/* this interrupt is for debug purposes only, dont request irq */
|
|
{
|
|
.irq_name = "spi_lr_overread",
|
|
.irq_handler = bcm_qspi_bspi_lr_err_l2_isr,
|
|
.mask = INTR_BSPI_LR_OVERREAD_MASK,
|
|
},
|
|
#endif
|
|
{
|
|
.irq_name = "mspi_done",
|
|
.irq_handler = bcm_qspi_mspi_l2_isr,
|
|
.mask = INTR_MSPI_DONE_MASK,
|
|
},
|
|
{
|
|
.irq_name = "mspi_halted",
|
|
.irq_handler = bcm_qspi_mspi_l2_isr,
|
|
.mask = INTR_MSPI_HALTED_MASK,
|
|
},
|
|
{
|
|
/* single muxed L1 interrupt source */
|
|
.irq_name = "spi_l1_intr",
|
|
.irq_handler = bcm_qspi_l1_isr,
|
|
.irq_source = MUXED_L1,
|
|
.mask = QSPI_INTERRUPTS_ALL,
|
|
},
|
|
};
|
|
|
|
static void bcm_qspi_bspi_init(struct bcm_qspi *qspi)
|
|
{
|
|
u32 val = 0;
|
|
|
|
val = bcm_qspi_read(qspi, BSPI, BSPI_REVISION_ID);
|
|
qspi->bspi_maj_rev = (val >> 8) & 0xff;
|
|
qspi->bspi_min_rev = val & 0xff;
|
|
if (!(bcm_qspi_bspi_ver_three(qspi))) {
|
|
/* Force mapping of BSPI address -> flash offset */
|
|
bcm_qspi_write(qspi, BSPI, BSPI_BSPI_XOR_VALUE, 0);
|
|
bcm_qspi_write(qspi, BSPI, BSPI_BSPI_XOR_ENABLE, 1);
|
|
}
|
|
qspi->bspi_enabled = 1;
|
|
bcm_qspi_disable_bspi(qspi);
|
|
bcm_qspi_write(qspi, BSPI, BSPI_B0_CTRL, 0);
|
|
bcm_qspi_write(qspi, BSPI, BSPI_B1_CTRL, 0);
|
|
}
|
|
|
|
static void bcm_qspi_hw_init(struct bcm_qspi *qspi)
|
|
{
|
|
struct bcm_qspi_parms parms;
|
|
|
|
bcm_qspi_write(qspi, MSPI, MSPI_SPCR1_LSB, 0);
|
|
bcm_qspi_write(qspi, MSPI, MSPI_SPCR1_MSB, 0);
|
|
bcm_qspi_write(qspi, MSPI, MSPI_NEWQP, 0);
|
|
bcm_qspi_write(qspi, MSPI, MSPI_ENDQP, 0);
|
|
bcm_qspi_write(qspi, MSPI, MSPI_SPCR2, 0x20);
|
|
|
|
parms.mode = SPI_MODE_3;
|
|
parms.bits_per_word = 8;
|
|
parms.speed_hz = qspi->max_speed_hz;
|
|
bcm_qspi_hw_set_parms(qspi, &parms);
|
|
|
|
if (has_bspi(qspi))
|
|
bcm_qspi_bspi_init(qspi);
|
|
}
|
|
|
|
static void bcm_qspi_hw_uninit(struct bcm_qspi *qspi)
|
|
{
|
|
bcm_qspi_write(qspi, MSPI, MSPI_SPCR2, 0);
|
|
if (has_bspi(qspi))
|
|
bcm_qspi_write(qspi, MSPI, MSPI_WRITE_LOCK, 0);
|
|
|
|
}
|
|
|
|
static const struct spi_controller_mem_ops bcm_qspi_mem_ops = {
|
|
.exec_op = bcm_qspi_exec_mem_op,
|
|
};
|
|
|
|
static const struct of_device_id bcm_qspi_of_match[] = {
|
|
{ .compatible = "brcm,spi-bcm-qspi" },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, bcm_qspi_of_match);
|
|
|
|
int bcm_qspi_probe(struct platform_device *pdev,
|
|
struct bcm_qspi_soc_intc *soc_intc)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct bcm_qspi *qspi;
|
|
struct spi_master *master;
|
|
struct resource *res;
|
|
int irq, ret = 0, num_ints = 0;
|
|
u32 val;
|
|
const char *name = NULL;
|
|
int num_irqs = ARRAY_SIZE(qspi_irq_tab);
|
|
|
|
/* We only support device-tree instantiation */
|
|
if (!dev->of_node)
|
|
return -ENODEV;
|
|
|
|
if (!of_match_node(bcm_qspi_of_match, dev->of_node))
|
|
return -ENODEV;
|
|
|
|
master = spi_alloc_master(dev, sizeof(struct bcm_qspi));
|
|
if (!master) {
|
|
dev_err(dev, "error allocating spi_master\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
qspi = spi_master_get_devdata(master);
|
|
qspi->pdev = pdev;
|
|
qspi->trans_pos.trans = NULL;
|
|
qspi->trans_pos.byte = 0;
|
|
qspi->trans_pos.mspi_last_trans = true;
|
|
qspi->master = master;
|
|
|
|
master->bus_num = -1;
|
|
master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_RX_DUAL | SPI_RX_QUAD;
|
|
master->setup = bcm_qspi_setup;
|
|
master->transfer_one = bcm_qspi_transfer_one;
|
|
master->mem_ops = &bcm_qspi_mem_ops;
|
|
master->cleanup = bcm_qspi_cleanup;
|
|
master->dev.of_node = dev->of_node;
|
|
master->num_chipselect = NUM_CHIPSELECT;
|
|
master->use_gpio_descriptors = true;
|
|
|
|
qspi->big_endian = of_device_is_big_endian(dev->of_node);
|
|
|
|
if (!of_property_read_u32(dev->of_node, "num-cs", &val))
|
|
master->num_chipselect = val;
|
|
|
|
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "hif_mspi");
|
|
if (!res)
|
|
res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
|
|
"mspi");
|
|
|
|
if (res) {
|
|
qspi->base[MSPI] = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(qspi->base[MSPI])) {
|
|
ret = PTR_ERR(qspi->base[MSPI]);
|
|
goto qspi_resource_err;
|
|
}
|
|
} else {
|
|
goto qspi_resource_err;
|
|
}
|
|
|
|
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "bspi");
|
|
if (res) {
|
|
qspi->base[BSPI] = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(qspi->base[BSPI])) {
|
|
ret = PTR_ERR(qspi->base[BSPI]);
|
|
goto qspi_resource_err;
|
|
}
|
|
qspi->bspi_mode = true;
|
|
} else {
|
|
qspi->bspi_mode = false;
|
|
}
|
|
|
|
dev_info(dev, "using %smspi mode\n", qspi->bspi_mode ? "bspi-" : "");
|
|
|
|
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cs_reg");
|
|
if (res) {
|
|
qspi->base[CHIP_SELECT] = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(qspi->base[CHIP_SELECT])) {
|
|
ret = PTR_ERR(qspi->base[CHIP_SELECT]);
|
|
goto qspi_resource_err;
|
|
}
|
|
}
|
|
|
|
qspi->dev_ids = kcalloc(num_irqs, sizeof(struct bcm_qspi_dev_id),
|
|
GFP_KERNEL);
|
|
if (!qspi->dev_ids) {
|
|
ret = -ENOMEM;
|
|
goto qspi_resource_err;
|
|
}
|
|
|
|
for (val = 0; val < num_irqs; val++) {
|
|
irq = -1;
|
|
name = qspi_irq_tab[val].irq_name;
|
|
if (qspi_irq_tab[val].irq_source == SINGLE_L2) {
|
|
/* get the l2 interrupts */
|
|
irq = platform_get_irq_byname(pdev, name);
|
|
} else if (!num_ints && soc_intc) {
|
|
/* all mspi, bspi intrs muxed to one L1 intr */
|
|
irq = platform_get_irq(pdev, 0);
|
|
}
|
|
|
|
if (irq >= 0) {
|
|
ret = devm_request_irq(&pdev->dev, irq,
|
|
qspi_irq_tab[val].irq_handler, 0,
|
|
name,
|
|
&qspi->dev_ids[val]);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "IRQ %s not found\n", name);
|
|
goto qspi_probe_err;
|
|
}
|
|
|
|
qspi->dev_ids[val].dev = qspi;
|
|
qspi->dev_ids[val].irqp = &qspi_irq_tab[val];
|
|
num_ints++;
|
|
dev_dbg(&pdev->dev, "registered IRQ %s %d\n",
|
|
qspi_irq_tab[val].irq_name,
|
|
irq);
|
|
}
|
|
}
|
|
|
|
if (!num_ints) {
|
|
dev_err(&pdev->dev, "no IRQs registered, cannot init driver\n");
|
|
ret = -EINVAL;
|
|
goto qspi_probe_err;
|
|
}
|
|
|
|
/*
|
|
* Some SoCs integrate spi controller (e.g., its interrupt bits)
|
|
* in specific ways
|
|
*/
|
|
if (soc_intc) {
|
|
qspi->soc_intc = soc_intc;
|
|
soc_intc->bcm_qspi_int_set(soc_intc, MSPI_DONE, true);
|
|
} else {
|
|
qspi->soc_intc = NULL;
|
|
}
|
|
|
|
qspi->clk = devm_clk_get(&pdev->dev, NULL);
|
|
if (IS_ERR(qspi->clk)) {
|
|
dev_warn(dev, "unable to get clock\n");
|
|
ret = PTR_ERR(qspi->clk);
|
|
goto qspi_probe_err;
|
|
}
|
|
|
|
ret = clk_prepare_enable(qspi->clk);
|
|
if (ret) {
|
|
dev_err(dev, "failed to prepare clock\n");
|
|
goto qspi_probe_err;
|
|
}
|
|
|
|
qspi->base_clk = clk_get_rate(qspi->clk);
|
|
qspi->max_speed_hz = qspi->base_clk / (QSPI_SPBR_MIN * 2);
|
|
|
|
bcm_qspi_hw_init(qspi);
|
|
init_completion(&qspi->mspi_done);
|
|
init_completion(&qspi->bspi_done);
|
|
qspi->curr_cs = -1;
|
|
|
|
platform_set_drvdata(pdev, qspi);
|
|
|
|
qspi->xfer_mode.width = -1;
|
|
qspi->xfer_mode.addrlen = -1;
|
|
qspi->xfer_mode.hp = -1;
|
|
|
|
ret = devm_spi_register_master(&pdev->dev, master);
|
|
if (ret < 0) {
|
|
dev_err(dev, "can't register master\n");
|
|
goto qspi_reg_err;
|
|
}
|
|
|
|
return 0;
|
|
|
|
qspi_reg_err:
|
|
bcm_qspi_hw_uninit(qspi);
|
|
clk_disable_unprepare(qspi->clk);
|
|
qspi_probe_err:
|
|
kfree(qspi->dev_ids);
|
|
qspi_resource_err:
|
|
spi_master_put(master);
|
|
return ret;
|
|
}
|
|
/* probe function to be called by SoC specific platform driver probe */
|
|
EXPORT_SYMBOL_GPL(bcm_qspi_probe);
|
|
|
|
int bcm_qspi_remove(struct platform_device *pdev)
|
|
{
|
|
struct bcm_qspi *qspi = platform_get_drvdata(pdev);
|
|
|
|
bcm_qspi_hw_uninit(qspi);
|
|
clk_disable_unprepare(qspi->clk);
|
|
kfree(qspi->dev_ids);
|
|
spi_unregister_master(qspi->master);
|
|
|
|
return 0;
|
|
}
|
|
/* function to be called by SoC specific platform driver remove() */
|
|
EXPORT_SYMBOL_GPL(bcm_qspi_remove);
|
|
|
|
static int __maybe_unused bcm_qspi_suspend(struct device *dev)
|
|
{
|
|
struct bcm_qspi *qspi = dev_get_drvdata(dev);
|
|
|
|
/* store the override strap value */
|
|
if (!bcm_qspi_bspi_ver_three(qspi))
|
|
qspi->s3_strap_override_ctrl =
|
|
bcm_qspi_read(qspi, BSPI, BSPI_STRAP_OVERRIDE_CTRL);
|
|
|
|
spi_master_suspend(qspi->master);
|
|
clk_disable(qspi->clk);
|
|
bcm_qspi_hw_uninit(qspi);
|
|
|
|
return 0;
|
|
};
|
|
|
|
static int __maybe_unused bcm_qspi_resume(struct device *dev)
|
|
{
|
|
struct bcm_qspi *qspi = dev_get_drvdata(dev);
|
|
int ret = 0;
|
|
|
|
bcm_qspi_hw_init(qspi);
|
|
bcm_qspi_chip_select(qspi, qspi->curr_cs);
|
|
if (qspi->soc_intc)
|
|
/* enable MSPI interrupt */
|
|
qspi->soc_intc->bcm_qspi_int_set(qspi->soc_intc, MSPI_DONE,
|
|
true);
|
|
|
|
ret = clk_enable(qspi->clk);
|
|
if (!ret)
|
|
spi_master_resume(qspi->master);
|
|
|
|
return ret;
|
|
}
|
|
|
|
SIMPLE_DEV_PM_OPS(bcm_qspi_pm_ops, bcm_qspi_suspend, bcm_qspi_resume);
|
|
|
|
/* pm_ops to be called by SoC specific platform driver */
|
|
EXPORT_SYMBOL_GPL(bcm_qspi_pm_ops);
|
|
|
|
MODULE_AUTHOR("Kamal Dasu");
|
|
MODULE_DESCRIPTION("Broadcom QSPI driver");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_ALIAS("platform:" DRIVER_NAME);
|