mirror of https://gitee.com/openkylin/linux.git
1060 lines
28 KiB
C
1060 lines
28 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2011-2015 Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
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* Copyright (C) 2016 Hauke Mehrtens <hauke@hauke-m.de>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/sched.h>
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#include <linux/completion.h>
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#include <linux/spinlock.h>
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#include <linux/err.h>
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#include <linux/pm_runtime.h>
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#include <linux/spi/spi.h>
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#ifdef CONFIG_LANTIQ
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#include <lantiq_soc.h>
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#endif
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#define LTQ_SPI_RX_IRQ_NAME "spi_rx"
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#define LTQ_SPI_TX_IRQ_NAME "spi_tx"
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#define LTQ_SPI_ERR_IRQ_NAME "spi_err"
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#define LTQ_SPI_FRM_IRQ_NAME "spi_frm"
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#define LTQ_SPI_CLC 0x00
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#define LTQ_SPI_PISEL 0x04
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#define LTQ_SPI_ID 0x08
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#define LTQ_SPI_CON 0x10
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#define LTQ_SPI_STAT 0x14
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#define LTQ_SPI_WHBSTATE 0x18
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#define LTQ_SPI_TB 0x20
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#define LTQ_SPI_RB 0x24
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#define LTQ_SPI_RXFCON 0x30
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#define LTQ_SPI_TXFCON 0x34
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#define LTQ_SPI_FSTAT 0x38
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#define LTQ_SPI_BRT 0x40
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#define LTQ_SPI_BRSTAT 0x44
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#define LTQ_SPI_SFCON 0x60
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#define LTQ_SPI_SFSTAT 0x64
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#define LTQ_SPI_GPOCON 0x70
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#define LTQ_SPI_GPOSTAT 0x74
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#define LTQ_SPI_FPGO 0x78
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#define LTQ_SPI_RXREQ 0x80
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#define LTQ_SPI_RXCNT 0x84
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#define LTQ_SPI_DMACON 0xec
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#define LTQ_SPI_IRNEN 0xf4
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#define LTQ_SPI_CLC_SMC_S 16 /* Clock divider for sleep mode */
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#define LTQ_SPI_CLC_SMC_M (0xFF << LTQ_SPI_CLC_SMC_S)
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#define LTQ_SPI_CLC_RMC_S 8 /* Clock divider for normal run mode */
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#define LTQ_SPI_CLC_RMC_M (0xFF << LTQ_SPI_CLC_RMC_S)
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#define LTQ_SPI_CLC_DISS BIT(1) /* Disable status bit */
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#define LTQ_SPI_CLC_DISR BIT(0) /* Disable request bit */
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#define LTQ_SPI_ID_TXFS_S 24 /* Implemented TX FIFO size */
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#define LTQ_SPI_ID_RXFS_S 16 /* Implemented RX FIFO size */
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#define LTQ_SPI_ID_MOD_S 8 /* Module ID */
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#define LTQ_SPI_ID_MOD_M (0xff << LTQ_SPI_ID_MOD_S)
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#define LTQ_SPI_ID_CFG_S 5 /* DMA interface support */
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#define LTQ_SPI_ID_CFG_M (1 << LTQ_SPI_ID_CFG_S)
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#define LTQ_SPI_ID_REV_M 0x1F /* Hardware revision number */
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#define LTQ_SPI_CON_BM_S 16 /* Data width selection */
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#define LTQ_SPI_CON_BM_M (0x1F << LTQ_SPI_CON_BM_S)
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#define LTQ_SPI_CON_EM BIT(24) /* Echo mode */
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#define LTQ_SPI_CON_IDLE BIT(23) /* Idle bit value */
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#define LTQ_SPI_CON_ENBV BIT(22) /* Enable byte valid control */
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#define LTQ_SPI_CON_RUEN BIT(12) /* Receive underflow error enable */
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#define LTQ_SPI_CON_TUEN BIT(11) /* Transmit underflow error enable */
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#define LTQ_SPI_CON_AEN BIT(10) /* Abort error enable */
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#define LTQ_SPI_CON_REN BIT(9) /* Receive overflow error enable */
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#define LTQ_SPI_CON_TEN BIT(8) /* Transmit overflow error enable */
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#define LTQ_SPI_CON_LB BIT(7) /* Loopback control */
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#define LTQ_SPI_CON_PO BIT(6) /* Clock polarity control */
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#define LTQ_SPI_CON_PH BIT(5) /* Clock phase control */
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#define LTQ_SPI_CON_HB BIT(4) /* Heading control */
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#define LTQ_SPI_CON_RXOFF BIT(1) /* Switch receiver off */
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#define LTQ_SPI_CON_TXOFF BIT(0) /* Switch transmitter off */
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#define LTQ_SPI_STAT_RXBV_S 28
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#define LTQ_SPI_STAT_RXBV_M (0x7 << LTQ_SPI_STAT_RXBV_S)
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#define LTQ_SPI_STAT_BSY BIT(13) /* Busy flag */
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#define LTQ_SPI_STAT_RUE BIT(12) /* Receive underflow error flag */
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#define LTQ_SPI_STAT_TUE BIT(11) /* Transmit underflow error flag */
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#define LTQ_SPI_STAT_AE BIT(10) /* Abort error flag */
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#define LTQ_SPI_STAT_RE BIT(9) /* Receive error flag */
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#define LTQ_SPI_STAT_TE BIT(8) /* Transmit error flag */
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#define LTQ_SPI_STAT_ME BIT(7) /* Mode error flag */
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#define LTQ_SPI_STAT_MS BIT(1) /* Master/slave select bit */
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#define LTQ_SPI_STAT_EN BIT(0) /* Enable bit */
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#define LTQ_SPI_STAT_ERRORS (LTQ_SPI_STAT_ME | LTQ_SPI_STAT_TE | \
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LTQ_SPI_STAT_RE | LTQ_SPI_STAT_AE | \
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LTQ_SPI_STAT_TUE | LTQ_SPI_STAT_RUE)
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#define LTQ_SPI_WHBSTATE_SETTUE BIT(15) /* Set transmit underflow error flag */
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#define LTQ_SPI_WHBSTATE_SETAE BIT(14) /* Set abort error flag */
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#define LTQ_SPI_WHBSTATE_SETRE BIT(13) /* Set receive error flag */
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#define LTQ_SPI_WHBSTATE_SETTE BIT(12) /* Set transmit error flag */
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#define LTQ_SPI_WHBSTATE_CLRTUE BIT(11) /* Clear transmit underflow error flag */
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#define LTQ_SPI_WHBSTATE_CLRAE BIT(10) /* Clear abort error flag */
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#define LTQ_SPI_WHBSTATE_CLRRE BIT(9) /* Clear receive error flag */
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#define LTQ_SPI_WHBSTATE_CLRTE BIT(8) /* Clear transmit error flag */
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#define LTQ_SPI_WHBSTATE_SETME BIT(7) /* Set mode error flag */
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#define LTQ_SPI_WHBSTATE_CLRME BIT(6) /* Clear mode error flag */
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#define LTQ_SPI_WHBSTATE_SETRUE BIT(5) /* Set receive underflow error flag */
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#define LTQ_SPI_WHBSTATE_CLRRUE BIT(4) /* Clear receive underflow error flag */
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#define LTQ_SPI_WHBSTATE_SETMS BIT(3) /* Set master select bit */
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#define LTQ_SPI_WHBSTATE_CLRMS BIT(2) /* Clear master select bit */
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#define LTQ_SPI_WHBSTATE_SETEN BIT(1) /* Set enable bit (operational mode) */
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#define LTQ_SPI_WHBSTATE_CLREN BIT(0) /* Clear enable bit (config mode */
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#define LTQ_SPI_WHBSTATE_CLR_ERRORS (LTQ_SPI_WHBSTATE_CLRRUE | \
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LTQ_SPI_WHBSTATE_CLRME | \
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LTQ_SPI_WHBSTATE_CLRTE | \
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LTQ_SPI_WHBSTATE_CLRRE | \
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LTQ_SPI_WHBSTATE_CLRAE | \
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LTQ_SPI_WHBSTATE_CLRTUE)
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#define LTQ_SPI_RXFCON_RXFITL_S 8 /* FIFO interrupt trigger level */
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#define LTQ_SPI_RXFCON_RXFLU BIT(1) /* FIFO flush */
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#define LTQ_SPI_RXFCON_RXFEN BIT(0) /* FIFO enable */
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#define LTQ_SPI_TXFCON_TXFITL_S 8 /* FIFO interrupt trigger level */
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#define LTQ_SPI_TXFCON_TXFLU BIT(1) /* FIFO flush */
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#define LTQ_SPI_TXFCON_TXFEN BIT(0) /* FIFO enable */
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#define LTQ_SPI_FSTAT_RXFFL_S 0
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#define LTQ_SPI_FSTAT_TXFFL_S 8
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#define LTQ_SPI_GPOCON_ISCSBN_S 8
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#define LTQ_SPI_GPOCON_INVOUTN_S 0
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#define LTQ_SPI_FGPO_SETOUTN_S 8
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#define LTQ_SPI_FGPO_CLROUTN_S 0
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#define LTQ_SPI_RXREQ_RXCNT_M 0xFFFF /* Receive count value */
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#define LTQ_SPI_RXCNT_TODO_M 0xFFFF /* Recevie to-do value */
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#define LTQ_SPI_IRNEN_TFI BIT(4) /* TX finished interrupt */
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#define LTQ_SPI_IRNEN_F BIT(3) /* Frame end interrupt request */
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#define LTQ_SPI_IRNEN_E BIT(2) /* Error end interrupt request */
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#define LTQ_SPI_IRNEN_T_XWAY BIT(1) /* Transmit end interrupt request */
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#define LTQ_SPI_IRNEN_R_XWAY BIT(0) /* Receive end interrupt request */
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#define LTQ_SPI_IRNEN_R_XRX BIT(1) /* Transmit end interrupt request */
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#define LTQ_SPI_IRNEN_T_XRX BIT(0) /* Receive end interrupt request */
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#define LTQ_SPI_IRNEN_ALL 0x1F
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struct lantiq_ssc_spi;
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struct lantiq_ssc_hwcfg {
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int (*cfg_irq)(struct platform_device *pdev, struct lantiq_ssc_spi *spi);
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unsigned int irnen_r;
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unsigned int irnen_t;
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unsigned int irncr;
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unsigned int irnicr;
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bool irq_ack;
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u32 fifo_size_mask;
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};
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struct lantiq_ssc_spi {
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struct spi_master *master;
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struct device *dev;
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void __iomem *regbase;
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struct clk *spi_clk;
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struct clk *fpi_clk;
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const struct lantiq_ssc_hwcfg *hwcfg;
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spinlock_t lock;
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struct workqueue_struct *wq;
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struct work_struct work;
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const u8 *tx;
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u8 *rx;
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unsigned int tx_todo;
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unsigned int rx_todo;
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unsigned int bits_per_word;
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unsigned int speed_hz;
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unsigned int tx_fifo_size;
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unsigned int rx_fifo_size;
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unsigned int base_cs;
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unsigned int fdx_tx_level;
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};
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static u32 lantiq_ssc_readl(const struct lantiq_ssc_spi *spi, u32 reg)
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{
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return __raw_readl(spi->regbase + reg);
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}
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static void lantiq_ssc_writel(const struct lantiq_ssc_spi *spi, u32 val,
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u32 reg)
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{
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__raw_writel(val, spi->regbase + reg);
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}
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static void lantiq_ssc_maskl(const struct lantiq_ssc_spi *spi, u32 clr,
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u32 set, u32 reg)
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{
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u32 val = __raw_readl(spi->regbase + reg);
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val &= ~clr;
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val |= set;
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__raw_writel(val, spi->regbase + reg);
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}
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static unsigned int tx_fifo_level(const struct lantiq_ssc_spi *spi)
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{
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const struct lantiq_ssc_hwcfg *hwcfg = spi->hwcfg;
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u32 fstat = lantiq_ssc_readl(spi, LTQ_SPI_FSTAT);
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return (fstat >> LTQ_SPI_FSTAT_TXFFL_S) & hwcfg->fifo_size_mask;
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}
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static unsigned int rx_fifo_level(const struct lantiq_ssc_spi *spi)
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{
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const struct lantiq_ssc_hwcfg *hwcfg = spi->hwcfg;
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u32 fstat = lantiq_ssc_readl(spi, LTQ_SPI_FSTAT);
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return (fstat >> LTQ_SPI_FSTAT_RXFFL_S) & hwcfg->fifo_size_mask;
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}
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static unsigned int tx_fifo_free(const struct lantiq_ssc_spi *spi)
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{
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return spi->tx_fifo_size - tx_fifo_level(spi);
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}
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static void rx_fifo_reset(const struct lantiq_ssc_spi *spi)
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{
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u32 val = spi->rx_fifo_size << LTQ_SPI_RXFCON_RXFITL_S;
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val |= LTQ_SPI_RXFCON_RXFEN | LTQ_SPI_RXFCON_RXFLU;
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lantiq_ssc_writel(spi, val, LTQ_SPI_RXFCON);
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}
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static void tx_fifo_reset(const struct lantiq_ssc_spi *spi)
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{
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u32 val = 1 << LTQ_SPI_TXFCON_TXFITL_S;
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val |= LTQ_SPI_TXFCON_TXFEN | LTQ_SPI_TXFCON_TXFLU;
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lantiq_ssc_writel(spi, val, LTQ_SPI_TXFCON);
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}
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static void rx_fifo_flush(const struct lantiq_ssc_spi *spi)
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{
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lantiq_ssc_maskl(spi, 0, LTQ_SPI_RXFCON_RXFLU, LTQ_SPI_RXFCON);
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}
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static void tx_fifo_flush(const struct lantiq_ssc_spi *spi)
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{
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lantiq_ssc_maskl(spi, 0, LTQ_SPI_TXFCON_TXFLU, LTQ_SPI_TXFCON);
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}
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static void hw_enter_config_mode(const struct lantiq_ssc_spi *spi)
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{
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lantiq_ssc_writel(spi, LTQ_SPI_WHBSTATE_CLREN, LTQ_SPI_WHBSTATE);
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}
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static void hw_enter_active_mode(const struct lantiq_ssc_spi *spi)
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{
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lantiq_ssc_writel(spi, LTQ_SPI_WHBSTATE_SETEN, LTQ_SPI_WHBSTATE);
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}
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static void hw_setup_speed_hz(const struct lantiq_ssc_spi *spi,
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unsigned int max_speed_hz)
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{
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u32 spi_clk, brt;
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/*
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* SPI module clock is derived from FPI bus clock dependent on
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* divider value in CLC.RMS which is always set to 1.
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*
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* f_SPI
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* baudrate = --------------
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* 2 * (BR + 1)
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*/
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spi_clk = clk_get_rate(spi->fpi_clk) / 2;
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if (max_speed_hz > spi_clk)
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brt = 0;
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else
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brt = spi_clk / max_speed_hz - 1;
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if (brt > 0xFFFF)
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brt = 0xFFFF;
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dev_dbg(spi->dev, "spi_clk %u, max_speed_hz %u, brt %u\n",
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spi_clk, max_speed_hz, brt);
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lantiq_ssc_writel(spi, brt, LTQ_SPI_BRT);
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}
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static void hw_setup_bits_per_word(const struct lantiq_ssc_spi *spi,
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unsigned int bits_per_word)
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{
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u32 bm;
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/* CON.BM value = bits_per_word - 1 */
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bm = (bits_per_word - 1) << LTQ_SPI_CON_BM_S;
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lantiq_ssc_maskl(spi, LTQ_SPI_CON_BM_M, bm, LTQ_SPI_CON);
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}
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static void hw_setup_clock_mode(const struct lantiq_ssc_spi *spi,
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unsigned int mode)
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{
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u32 con_set = 0, con_clr = 0;
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/*
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* SPI mode mapping in CON register:
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* Mode CPOL CPHA CON.PO CON.PH
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* 0 0 0 0 1
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* 1 0 1 0 0
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* 2 1 0 1 1
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* 3 1 1 1 0
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*/
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if (mode & SPI_CPHA)
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con_clr |= LTQ_SPI_CON_PH;
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else
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con_set |= LTQ_SPI_CON_PH;
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if (mode & SPI_CPOL)
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con_set |= LTQ_SPI_CON_PO | LTQ_SPI_CON_IDLE;
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else
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con_clr |= LTQ_SPI_CON_PO | LTQ_SPI_CON_IDLE;
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/* Set heading control */
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if (mode & SPI_LSB_FIRST)
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con_clr |= LTQ_SPI_CON_HB;
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else
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con_set |= LTQ_SPI_CON_HB;
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/* Set loopback mode */
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if (mode & SPI_LOOP)
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con_set |= LTQ_SPI_CON_LB;
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else
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con_clr |= LTQ_SPI_CON_LB;
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lantiq_ssc_maskl(spi, con_clr, con_set, LTQ_SPI_CON);
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}
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static void lantiq_ssc_hw_init(const struct lantiq_ssc_spi *spi)
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{
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const struct lantiq_ssc_hwcfg *hwcfg = spi->hwcfg;
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/*
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* Set clock divider for run mode to 1 to
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* run at same frequency as FPI bus
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*/
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lantiq_ssc_writel(spi, 1 << LTQ_SPI_CLC_RMC_S, LTQ_SPI_CLC);
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/* Put controller into config mode */
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hw_enter_config_mode(spi);
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/* Clear error flags */
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lantiq_ssc_maskl(spi, 0, LTQ_SPI_WHBSTATE_CLR_ERRORS, LTQ_SPI_WHBSTATE);
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/* Enable error checking, disable TX/RX */
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lantiq_ssc_writel(spi, LTQ_SPI_CON_RUEN | LTQ_SPI_CON_AEN |
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LTQ_SPI_CON_TEN | LTQ_SPI_CON_REN | LTQ_SPI_CON_TXOFF |
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LTQ_SPI_CON_RXOFF, LTQ_SPI_CON);
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/* Setup default SPI mode */
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hw_setup_bits_per_word(spi, spi->bits_per_word);
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hw_setup_clock_mode(spi, SPI_MODE_0);
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/* Enable master mode and clear error flags */
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lantiq_ssc_writel(spi, LTQ_SPI_WHBSTATE_SETMS |
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LTQ_SPI_WHBSTATE_CLR_ERRORS,
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LTQ_SPI_WHBSTATE);
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/* Reset GPIO/CS registers */
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lantiq_ssc_writel(spi, 0, LTQ_SPI_GPOCON);
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lantiq_ssc_writel(spi, 0xFF00, LTQ_SPI_FPGO);
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/* Enable and flush FIFOs */
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rx_fifo_reset(spi);
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tx_fifo_reset(spi);
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/* Enable interrupts */
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lantiq_ssc_writel(spi, hwcfg->irnen_t | hwcfg->irnen_r |
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LTQ_SPI_IRNEN_E, LTQ_SPI_IRNEN);
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}
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static int lantiq_ssc_setup(struct spi_device *spidev)
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{
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struct spi_master *master = spidev->master;
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struct lantiq_ssc_spi *spi = spi_master_get_devdata(master);
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unsigned int cs = spidev->chip_select;
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u32 gpocon;
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/* GPIOs are used for CS */
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if (spidev->cs_gpiod)
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return 0;
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dev_dbg(spi->dev, "using internal chipselect %u\n", cs);
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if (cs < spi->base_cs) {
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dev_err(spi->dev,
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"chipselect %i too small (min %i)\n", cs, spi->base_cs);
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return -EINVAL;
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}
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/* set GPO pin to CS mode */
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gpocon = 1 << ((cs - spi->base_cs) + LTQ_SPI_GPOCON_ISCSBN_S);
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/* invert GPO pin */
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if (spidev->mode & SPI_CS_HIGH)
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gpocon |= 1 << (cs - spi->base_cs);
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lantiq_ssc_maskl(spi, 0, gpocon, LTQ_SPI_GPOCON);
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return 0;
|
|
}
|
|
|
|
static int lantiq_ssc_prepare_message(struct spi_master *master,
|
|
struct spi_message *message)
|
|
{
|
|
struct lantiq_ssc_spi *spi = spi_master_get_devdata(master);
|
|
|
|
hw_enter_config_mode(spi);
|
|
hw_setup_clock_mode(spi, message->spi->mode);
|
|
hw_enter_active_mode(spi);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void hw_setup_transfer(struct lantiq_ssc_spi *spi,
|
|
struct spi_device *spidev, struct spi_transfer *t)
|
|
{
|
|
unsigned int speed_hz = t->speed_hz;
|
|
unsigned int bits_per_word = t->bits_per_word;
|
|
u32 con;
|
|
|
|
if (bits_per_word != spi->bits_per_word ||
|
|
speed_hz != spi->speed_hz) {
|
|
hw_enter_config_mode(spi);
|
|
hw_setup_speed_hz(spi, speed_hz);
|
|
hw_setup_bits_per_word(spi, bits_per_word);
|
|
hw_enter_active_mode(spi);
|
|
|
|
spi->speed_hz = speed_hz;
|
|
spi->bits_per_word = bits_per_word;
|
|
}
|
|
|
|
/* Configure transmitter and receiver */
|
|
con = lantiq_ssc_readl(spi, LTQ_SPI_CON);
|
|
if (t->tx_buf)
|
|
con &= ~LTQ_SPI_CON_TXOFF;
|
|
else
|
|
con |= LTQ_SPI_CON_TXOFF;
|
|
|
|
if (t->rx_buf)
|
|
con &= ~LTQ_SPI_CON_RXOFF;
|
|
else
|
|
con |= LTQ_SPI_CON_RXOFF;
|
|
|
|
lantiq_ssc_writel(spi, con, LTQ_SPI_CON);
|
|
}
|
|
|
|
static int lantiq_ssc_unprepare_message(struct spi_master *master,
|
|
struct spi_message *message)
|
|
{
|
|
struct lantiq_ssc_spi *spi = spi_master_get_devdata(master);
|
|
|
|
flush_workqueue(spi->wq);
|
|
|
|
/* Disable transmitter and receiver while idle */
|
|
lantiq_ssc_maskl(spi, 0, LTQ_SPI_CON_TXOFF | LTQ_SPI_CON_RXOFF,
|
|
LTQ_SPI_CON);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void tx_fifo_write(struct lantiq_ssc_spi *spi)
|
|
{
|
|
const u8 *tx8;
|
|
const u16 *tx16;
|
|
const u32 *tx32;
|
|
u32 data;
|
|
unsigned int tx_free = tx_fifo_free(spi);
|
|
|
|
spi->fdx_tx_level = 0;
|
|
while (spi->tx_todo && tx_free) {
|
|
switch (spi->bits_per_word) {
|
|
case 2 ... 8:
|
|
tx8 = spi->tx;
|
|
data = *tx8;
|
|
spi->tx_todo--;
|
|
spi->tx++;
|
|
break;
|
|
case 16:
|
|
tx16 = (u16 *) spi->tx;
|
|
data = *tx16;
|
|
spi->tx_todo -= 2;
|
|
spi->tx += 2;
|
|
break;
|
|
case 32:
|
|
tx32 = (u32 *) spi->tx;
|
|
data = *tx32;
|
|
spi->tx_todo -= 4;
|
|
spi->tx += 4;
|
|
break;
|
|
default:
|
|
WARN_ON(1);
|
|
data = 0;
|
|
break;
|
|
}
|
|
|
|
lantiq_ssc_writel(spi, data, LTQ_SPI_TB);
|
|
tx_free--;
|
|
spi->fdx_tx_level++;
|
|
}
|
|
}
|
|
|
|
static void rx_fifo_read_full_duplex(struct lantiq_ssc_spi *spi)
|
|
{
|
|
u8 *rx8;
|
|
u16 *rx16;
|
|
u32 *rx32;
|
|
u32 data;
|
|
unsigned int rx_fill = rx_fifo_level(spi);
|
|
|
|
/*
|
|
* Wait until all expected data to be shifted in.
|
|
* Otherwise, rx overrun may occur.
|
|
*/
|
|
while (rx_fill != spi->fdx_tx_level)
|
|
rx_fill = rx_fifo_level(spi);
|
|
|
|
while (rx_fill) {
|
|
data = lantiq_ssc_readl(spi, LTQ_SPI_RB);
|
|
|
|
switch (spi->bits_per_word) {
|
|
case 2 ... 8:
|
|
rx8 = spi->rx;
|
|
*rx8 = data;
|
|
spi->rx_todo--;
|
|
spi->rx++;
|
|
break;
|
|
case 16:
|
|
rx16 = (u16 *) spi->rx;
|
|
*rx16 = data;
|
|
spi->rx_todo -= 2;
|
|
spi->rx += 2;
|
|
break;
|
|
case 32:
|
|
rx32 = (u32 *) spi->rx;
|
|
*rx32 = data;
|
|
spi->rx_todo -= 4;
|
|
spi->rx += 4;
|
|
break;
|
|
default:
|
|
WARN_ON(1);
|
|
break;
|
|
}
|
|
|
|
rx_fill--;
|
|
}
|
|
}
|
|
|
|
static void rx_fifo_read_half_duplex(struct lantiq_ssc_spi *spi)
|
|
{
|
|
u32 data, *rx32;
|
|
u8 *rx8;
|
|
unsigned int rxbv, shift;
|
|
unsigned int rx_fill = rx_fifo_level(spi);
|
|
|
|
/*
|
|
* In RX-only mode the bits per word value is ignored by HW. A value
|
|
* of 32 is used instead. Thus all 4 bytes per FIFO must be read.
|
|
* If remaining RX bytes are less than 4, the FIFO must be read
|
|
* differently. The amount of received and valid bytes is indicated
|
|
* by STAT.RXBV register value.
|
|
*/
|
|
while (rx_fill) {
|
|
if (spi->rx_todo < 4) {
|
|
rxbv = (lantiq_ssc_readl(spi, LTQ_SPI_STAT) &
|
|
LTQ_SPI_STAT_RXBV_M) >> LTQ_SPI_STAT_RXBV_S;
|
|
data = lantiq_ssc_readl(spi, LTQ_SPI_RB);
|
|
|
|
shift = (rxbv - 1) * 8;
|
|
rx8 = spi->rx;
|
|
|
|
while (rxbv) {
|
|
*rx8++ = (data >> shift) & 0xFF;
|
|
rxbv--;
|
|
shift -= 8;
|
|
spi->rx_todo--;
|
|
spi->rx++;
|
|
}
|
|
} else {
|
|
data = lantiq_ssc_readl(spi, LTQ_SPI_RB);
|
|
rx32 = (u32 *) spi->rx;
|
|
|
|
*rx32++ = data;
|
|
spi->rx_todo -= 4;
|
|
spi->rx += 4;
|
|
}
|
|
rx_fill--;
|
|
}
|
|
}
|
|
|
|
static void rx_request(struct lantiq_ssc_spi *spi)
|
|
{
|
|
unsigned int rxreq, rxreq_max;
|
|
|
|
/*
|
|
* 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 = spi->rx_todo;
|
|
rxreq_max = spi->rx_fifo_size * 4;
|
|
if (rxreq > rxreq_max)
|
|
rxreq = rxreq_max;
|
|
|
|
lantiq_ssc_writel(spi, rxreq, LTQ_SPI_RXREQ);
|
|
}
|
|
|
|
static irqreturn_t lantiq_ssc_xmit_interrupt(int irq, void *data)
|
|
{
|
|
struct lantiq_ssc_spi *spi = data;
|
|
const struct lantiq_ssc_hwcfg *hwcfg = spi->hwcfg;
|
|
u32 val = lantiq_ssc_readl(spi, hwcfg->irncr);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&spi->lock, flags);
|
|
if (hwcfg->irq_ack)
|
|
lantiq_ssc_writel(spi, val, hwcfg->irncr);
|
|
|
|
if (spi->tx) {
|
|
if (spi->rx && spi->rx_todo)
|
|
rx_fifo_read_full_duplex(spi);
|
|
|
|
if (spi->tx_todo)
|
|
tx_fifo_write(spi);
|
|
else if (!tx_fifo_level(spi))
|
|
goto completed;
|
|
} else if (spi->rx) {
|
|
if (spi->rx_todo) {
|
|
rx_fifo_read_half_duplex(spi);
|
|
|
|
if (spi->rx_todo)
|
|
rx_request(spi);
|
|
else
|
|
goto completed;
|
|
} else {
|
|
goto completed;
|
|
}
|
|
}
|
|
|
|
spin_unlock_irqrestore(&spi->lock, flags);
|
|
return IRQ_HANDLED;
|
|
|
|
completed:
|
|
queue_work(spi->wq, &spi->work);
|
|
spin_unlock_irqrestore(&spi->lock, flags);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t lantiq_ssc_err_interrupt(int irq, void *data)
|
|
{
|
|
struct lantiq_ssc_spi *spi = data;
|
|
const struct lantiq_ssc_hwcfg *hwcfg = spi->hwcfg;
|
|
u32 stat = lantiq_ssc_readl(spi, LTQ_SPI_STAT);
|
|
u32 val = lantiq_ssc_readl(spi, hwcfg->irncr);
|
|
unsigned long flags;
|
|
|
|
if (!(stat & LTQ_SPI_STAT_ERRORS))
|
|
return IRQ_NONE;
|
|
|
|
spin_lock_irqsave(&spi->lock, flags);
|
|
if (hwcfg->irq_ack)
|
|
lantiq_ssc_writel(spi, val, hwcfg->irncr);
|
|
|
|
if (stat & LTQ_SPI_STAT_RUE)
|
|
dev_err(spi->dev, "receive underflow error\n");
|
|
if (stat & LTQ_SPI_STAT_TUE)
|
|
dev_err(spi->dev, "transmit underflow error\n");
|
|
if (stat & LTQ_SPI_STAT_AE)
|
|
dev_err(spi->dev, "abort error\n");
|
|
if (stat & LTQ_SPI_STAT_RE)
|
|
dev_err(spi->dev, "receive overflow error\n");
|
|
if (stat & LTQ_SPI_STAT_TE)
|
|
dev_err(spi->dev, "transmit overflow error\n");
|
|
if (stat & LTQ_SPI_STAT_ME)
|
|
dev_err(spi->dev, "mode error\n");
|
|
|
|
/* Clear error flags */
|
|
lantiq_ssc_maskl(spi, 0, LTQ_SPI_WHBSTATE_CLR_ERRORS, LTQ_SPI_WHBSTATE);
|
|
|
|
/* set bad status so it can be retried */
|
|
if (spi->master->cur_msg)
|
|
spi->master->cur_msg->status = -EIO;
|
|
queue_work(spi->wq, &spi->work);
|
|
spin_unlock_irqrestore(&spi->lock, flags);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static irqreturn_t intel_lgm_ssc_isr(int irq, void *data)
|
|
{
|
|
struct lantiq_ssc_spi *spi = data;
|
|
const struct lantiq_ssc_hwcfg *hwcfg = spi->hwcfg;
|
|
u32 val = lantiq_ssc_readl(spi, hwcfg->irncr);
|
|
|
|
if (!(val & LTQ_SPI_IRNEN_ALL))
|
|
return IRQ_NONE;
|
|
|
|
if (val & LTQ_SPI_IRNEN_E)
|
|
return lantiq_ssc_err_interrupt(irq, data);
|
|
|
|
if ((val & hwcfg->irnen_t) || (val & hwcfg->irnen_r))
|
|
return lantiq_ssc_xmit_interrupt(irq, data);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int transfer_start(struct lantiq_ssc_spi *spi, struct spi_device *spidev,
|
|
struct spi_transfer *t)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&spi->lock, flags);
|
|
|
|
spi->tx = t->tx_buf;
|
|
spi->rx = t->rx_buf;
|
|
|
|
if (t->tx_buf) {
|
|
spi->tx_todo = t->len;
|
|
|
|
/* initially fill TX FIFO */
|
|
tx_fifo_write(spi);
|
|
}
|
|
|
|
if (spi->rx) {
|
|
spi->rx_todo = t->len;
|
|
|
|
/* start shift clock in RX-only mode */
|
|
if (!spi->tx)
|
|
rx_request(spi);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&spi->lock, flags);
|
|
|
|
return t->len;
|
|
}
|
|
|
|
/*
|
|
* The driver only gets an interrupt when the FIFO is empty, but there
|
|
* is an additional shift register from which the data is written to
|
|
* the wire. We get the last interrupt when the controller starts to
|
|
* write the last word to the wire, not when it is finished. Do busy
|
|
* waiting till it finishes.
|
|
*/
|
|
static void lantiq_ssc_bussy_work(struct work_struct *work)
|
|
{
|
|
struct lantiq_ssc_spi *spi;
|
|
unsigned long long timeout = 8LL * 1000LL;
|
|
unsigned long end;
|
|
|
|
spi = container_of(work, typeof(*spi), work);
|
|
|
|
do_div(timeout, spi->speed_hz);
|
|
timeout += timeout + 100; /* some tolerance */
|
|
|
|
end = jiffies + msecs_to_jiffies(timeout);
|
|
do {
|
|
u32 stat = lantiq_ssc_readl(spi, LTQ_SPI_STAT);
|
|
|
|
if (!(stat & LTQ_SPI_STAT_BSY)) {
|
|
spi_finalize_current_transfer(spi->master);
|
|
return;
|
|
}
|
|
|
|
cond_resched();
|
|
} while (!time_after_eq(jiffies, end));
|
|
|
|
if (spi->master->cur_msg)
|
|
spi->master->cur_msg->status = -EIO;
|
|
spi_finalize_current_transfer(spi->master);
|
|
}
|
|
|
|
static void lantiq_ssc_handle_err(struct spi_master *master,
|
|
struct spi_message *message)
|
|
{
|
|
struct lantiq_ssc_spi *spi = spi_master_get_devdata(master);
|
|
|
|
/* flush FIFOs on timeout */
|
|
rx_fifo_flush(spi);
|
|
tx_fifo_flush(spi);
|
|
}
|
|
|
|
static void lantiq_ssc_set_cs(struct spi_device *spidev, bool enable)
|
|
{
|
|
struct lantiq_ssc_spi *spi = spi_master_get_devdata(spidev->master);
|
|
unsigned int cs = spidev->chip_select;
|
|
u32 fgpo;
|
|
|
|
if (!!(spidev->mode & SPI_CS_HIGH) == enable)
|
|
fgpo = (1 << (cs - spi->base_cs));
|
|
else
|
|
fgpo = (1 << (cs - spi->base_cs + LTQ_SPI_FGPO_SETOUTN_S));
|
|
|
|
lantiq_ssc_writel(spi, fgpo, LTQ_SPI_FPGO);
|
|
}
|
|
|
|
static int lantiq_ssc_transfer_one(struct spi_master *master,
|
|
struct spi_device *spidev,
|
|
struct spi_transfer *t)
|
|
{
|
|
struct lantiq_ssc_spi *spi = spi_master_get_devdata(master);
|
|
|
|
hw_setup_transfer(spi, spidev, t);
|
|
|
|
return transfer_start(spi, spidev, t);
|
|
}
|
|
|
|
static int intel_lgm_cfg_irq(struct platform_device *pdev, struct lantiq_ssc_spi *spi)
|
|
{
|
|
int irq;
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq < 0)
|
|
return irq;
|
|
|
|
return devm_request_irq(&pdev->dev, irq, intel_lgm_ssc_isr, 0, "spi", spi);
|
|
}
|
|
|
|
static int lantiq_cfg_irq(struct platform_device *pdev, struct lantiq_ssc_spi *spi)
|
|
{
|
|
int irq, err;
|
|
|
|
irq = platform_get_irq_byname(pdev, LTQ_SPI_RX_IRQ_NAME);
|
|
if (irq < 0)
|
|
return irq;
|
|
|
|
err = devm_request_irq(&pdev->dev, irq, lantiq_ssc_xmit_interrupt,
|
|
0, LTQ_SPI_RX_IRQ_NAME, spi);
|
|
if (err)
|
|
return err;
|
|
|
|
irq = platform_get_irq_byname(pdev, LTQ_SPI_TX_IRQ_NAME);
|
|
if (irq < 0)
|
|
return irq;
|
|
|
|
err = devm_request_irq(&pdev->dev, irq, lantiq_ssc_xmit_interrupt,
|
|
0, LTQ_SPI_TX_IRQ_NAME, spi);
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
irq = platform_get_irq_byname(pdev, LTQ_SPI_ERR_IRQ_NAME);
|
|
if (irq < 0)
|
|
return irq;
|
|
|
|
err = devm_request_irq(&pdev->dev, irq, lantiq_ssc_err_interrupt,
|
|
0, LTQ_SPI_ERR_IRQ_NAME, spi);
|
|
return err;
|
|
}
|
|
|
|
static const struct lantiq_ssc_hwcfg lantiq_ssc_xway = {
|
|
.cfg_irq = lantiq_cfg_irq,
|
|
.irnen_r = LTQ_SPI_IRNEN_R_XWAY,
|
|
.irnen_t = LTQ_SPI_IRNEN_T_XWAY,
|
|
.irnicr = 0xF8,
|
|
.irncr = 0xFC,
|
|
.fifo_size_mask = GENMASK(5, 0),
|
|
.irq_ack = false,
|
|
};
|
|
|
|
static const struct lantiq_ssc_hwcfg lantiq_ssc_xrx = {
|
|
.cfg_irq = lantiq_cfg_irq,
|
|
.irnen_r = LTQ_SPI_IRNEN_R_XRX,
|
|
.irnen_t = LTQ_SPI_IRNEN_T_XRX,
|
|
.irnicr = 0xF8,
|
|
.irncr = 0xFC,
|
|
.fifo_size_mask = GENMASK(5, 0),
|
|
.irq_ack = false,
|
|
};
|
|
|
|
static const struct lantiq_ssc_hwcfg intel_ssc_lgm = {
|
|
.cfg_irq = intel_lgm_cfg_irq,
|
|
.irnen_r = LTQ_SPI_IRNEN_R_XRX,
|
|
.irnen_t = LTQ_SPI_IRNEN_T_XRX,
|
|
.irnicr = 0xFC,
|
|
.irncr = 0xF8,
|
|
.fifo_size_mask = GENMASK(7, 0),
|
|
.irq_ack = true,
|
|
};
|
|
|
|
static const struct of_device_id lantiq_ssc_match[] = {
|
|
{ .compatible = "lantiq,ase-spi", .data = &lantiq_ssc_xway, },
|
|
{ .compatible = "lantiq,falcon-spi", .data = &lantiq_ssc_xrx, },
|
|
{ .compatible = "lantiq,xrx100-spi", .data = &lantiq_ssc_xrx, },
|
|
{ .compatible = "intel,lgm-spi", .data = &intel_ssc_lgm, },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, lantiq_ssc_match);
|
|
|
|
static int lantiq_ssc_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct spi_master *master;
|
|
struct lantiq_ssc_spi *spi;
|
|
const struct lantiq_ssc_hwcfg *hwcfg;
|
|
const struct of_device_id *match;
|
|
u32 id, supports_dma, revision;
|
|
unsigned int num_cs;
|
|
int err;
|
|
|
|
match = of_match_device(lantiq_ssc_match, dev);
|
|
if (!match) {
|
|
dev_err(dev, "no device match\n");
|
|
return -EINVAL;
|
|
}
|
|
hwcfg = match->data;
|
|
|
|
master = spi_alloc_master(dev, sizeof(struct lantiq_ssc_spi));
|
|
if (!master)
|
|
return -ENOMEM;
|
|
|
|
spi = spi_master_get_devdata(master);
|
|
spi->master = master;
|
|
spi->dev = dev;
|
|
spi->hwcfg = hwcfg;
|
|
platform_set_drvdata(pdev, spi);
|
|
spi->regbase = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(spi->regbase)) {
|
|
err = PTR_ERR(spi->regbase);
|
|
goto err_master_put;
|
|
}
|
|
|
|
err = hwcfg->cfg_irq(pdev, spi);
|
|
if (err)
|
|
goto err_master_put;
|
|
|
|
spi->spi_clk = devm_clk_get(dev, "gate");
|
|
if (IS_ERR(spi->spi_clk)) {
|
|
err = PTR_ERR(spi->spi_clk);
|
|
goto err_master_put;
|
|
}
|
|
err = clk_prepare_enable(spi->spi_clk);
|
|
if (err)
|
|
goto err_master_put;
|
|
|
|
/*
|
|
* Use the old clk_get_fpi() function on Lantiq platform, till it
|
|
* supports common clk.
|
|
*/
|
|
#if defined(CONFIG_LANTIQ) && !defined(CONFIG_COMMON_CLK)
|
|
spi->fpi_clk = clk_get_fpi();
|
|
#else
|
|
spi->fpi_clk = clk_get(dev, "freq");
|
|
#endif
|
|
if (IS_ERR(spi->fpi_clk)) {
|
|
err = PTR_ERR(spi->fpi_clk);
|
|
goto err_clk_disable;
|
|
}
|
|
|
|
num_cs = 8;
|
|
of_property_read_u32(pdev->dev.of_node, "num-cs", &num_cs);
|
|
|
|
spi->base_cs = 1;
|
|
of_property_read_u32(pdev->dev.of_node, "base-cs", &spi->base_cs);
|
|
|
|
spin_lock_init(&spi->lock);
|
|
spi->bits_per_word = 8;
|
|
spi->speed_hz = 0;
|
|
|
|
master->dev.of_node = pdev->dev.of_node;
|
|
master->num_chipselect = num_cs;
|
|
master->use_gpio_descriptors = true;
|
|
master->setup = lantiq_ssc_setup;
|
|
master->set_cs = lantiq_ssc_set_cs;
|
|
master->handle_err = lantiq_ssc_handle_err;
|
|
master->prepare_message = lantiq_ssc_prepare_message;
|
|
master->unprepare_message = lantiq_ssc_unprepare_message;
|
|
master->transfer_one = lantiq_ssc_transfer_one;
|
|
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST | SPI_CS_HIGH |
|
|
SPI_LOOP;
|
|
master->bits_per_word_mask = SPI_BPW_RANGE_MASK(2, 8) |
|
|
SPI_BPW_MASK(16) | SPI_BPW_MASK(32);
|
|
|
|
spi->wq = alloc_ordered_workqueue(dev_name(dev), WQ_MEM_RECLAIM);
|
|
if (!spi->wq) {
|
|
err = -ENOMEM;
|
|
goto err_clk_put;
|
|
}
|
|
INIT_WORK(&spi->work, lantiq_ssc_bussy_work);
|
|
|
|
id = lantiq_ssc_readl(spi, LTQ_SPI_ID);
|
|
spi->tx_fifo_size = (id >> LTQ_SPI_ID_TXFS_S) & hwcfg->fifo_size_mask;
|
|
spi->rx_fifo_size = (id >> LTQ_SPI_ID_RXFS_S) & hwcfg->fifo_size_mask;
|
|
supports_dma = (id & LTQ_SPI_ID_CFG_M) >> LTQ_SPI_ID_CFG_S;
|
|
revision = id & LTQ_SPI_ID_REV_M;
|
|
|
|
lantiq_ssc_hw_init(spi);
|
|
|
|
dev_info(dev,
|
|
"Lantiq SSC SPI controller (Rev %i, TXFS %u, RXFS %u, DMA %u)\n",
|
|
revision, spi->tx_fifo_size, spi->rx_fifo_size, supports_dma);
|
|
|
|
err = devm_spi_register_master(dev, master);
|
|
if (err) {
|
|
dev_err(dev, "failed to register spi_master\n");
|
|
goto err_wq_destroy;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_wq_destroy:
|
|
destroy_workqueue(spi->wq);
|
|
err_clk_put:
|
|
clk_put(spi->fpi_clk);
|
|
err_clk_disable:
|
|
clk_disable_unprepare(spi->spi_clk);
|
|
err_master_put:
|
|
spi_master_put(master);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int lantiq_ssc_remove(struct platform_device *pdev)
|
|
{
|
|
struct lantiq_ssc_spi *spi = platform_get_drvdata(pdev);
|
|
|
|
lantiq_ssc_writel(spi, 0, LTQ_SPI_IRNEN);
|
|
lantiq_ssc_writel(spi, 0, LTQ_SPI_CLC);
|
|
rx_fifo_flush(spi);
|
|
tx_fifo_flush(spi);
|
|
hw_enter_config_mode(spi);
|
|
|
|
destroy_workqueue(spi->wq);
|
|
clk_disable_unprepare(spi->spi_clk);
|
|
clk_put(spi->fpi_clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver lantiq_ssc_driver = {
|
|
.probe = lantiq_ssc_probe,
|
|
.remove = lantiq_ssc_remove,
|
|
.driver = {
|
|
.name = "spi-lantiq-ssc",
|
|
.of_match_table = lantiq_ssc_match,
|
|
},
|
|
};
|
|
module_platform_driver(lantiq_ssc_driver);
|
|
|
|
MODULE_DESCRIPTION("Lantiq SSC SPI controller driver");
|
|
MODULE_AUTHOR("Daniel Schwierzeck <daniel.schwierzeck@gmail.com>");
|
|
MODULE_AUTHOR("Hauke Mehrtens <hauke@hauke-m.de>");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:spi-lantiq-ssc");
|