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Release 4.11 drivers/spi/spi-bcm63xx.c

Directory: drivers/spi
/*
 * Broadcom BCM63xx SPI controller support
 *
 * Copyright (C) 2009-2012 Florian Fainelli <florian@openwrt.org>
 * Copyright (C) 2010 Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/spi/spi.h>
#include <linux/completion.h>
#include <linux/err.h>
#include <linux/pm_runtime.h>

/* BCM 6338/6348 SPI core */

#define SPI_6348_RSET_SIZE		64

#define SPI_6348_CMD			0x00	
/* 16-bits register */

#define SPI_6348_INT_STATUS		0x02

#define SPI_6348_INT_MASK_ST		0x03

#define SPI_6348_INT_MASK		0x04

#define SPI_6348_ST			0x05

#define SPI_6348_CLK_CFG		0x06

#define SPI_6348_FILL_BYTE		0x07

#define SPI_6348_MSG_TAIL		0x09

#define SPI_6348_RX_TAIL		0x0b

#define SPI_6348_MSG_CTL		0x40	
/* 8-bits register */

#define SPI_6348_MSG_CTL_WIDTH		8

#define SPI_6348_MSG_DATA		0x41

#define SPI_6348_MSG_DATA_SIZE		0x3f

#define SPI_6348_RX_DATA		0x80

#define SPI_6348_RX_DATA_SIZE		0x3f

/* BCM 3368/6358/6262/6368 SPI core */

#define SPI_6358_RSET_SIZE		1804

#define SPI_6358_MSG_CTL		0x00	
/* 16-bits register */

#define SPI_6358_MSG_CTL_WIDTH		16

#define SPI_6358_MSG_DATA		0x02

#define SPI_6358_MSG_DATA_SIZE		0x21e

#define SPI_6358_RX_DATA		0x400

#define SPI_6358_RX_DATA_SIZE		0x220

#define SPI_6358_CMD			0x700	
/* 16-bits register */

#define SPI_6358_INT_STATUS		0x702

#define SPI_6358_INT_MASK_ST		0x703

#define SPI_6358_INT_MASK		0x704

#define SPI_6358_ST			0x705

#define SPI_6358_CLK_CFG		0x706

#define SPI_6358_FILL_BYTE		0x707

#define SPI_6358_MSG_TAIL		0x709

#define SPI_6358_RX_TAIL		0x70B

/* Shared SPI definitions */

/* Message configuration */

#define SPI_FD_RW			0x00

#define SPI_HD_W			0x01

#define SPI_HD_R			0x02

#define SPI_BYTE_CNT_SHIFT		0

#define SPI_6348_MSG_TYPE_SHIFT		6

#define SPI_6358_MSG_TYPE_SHIFT		14

/* Command */

#define SPI_CMD_NOOP			0x00

#define SPI_CMD_SOFT_RESET		0x01

#define SPI_CMD_HARD_RESET		0x02

#define SPI_CMD_START_IMMEDIATE		0x03

#define SPI_CMD_COMMAND_SHIFT		0

#define SPI_CMD_COMMAND_MASK		0x000f

#define SPI_CMD_DEVICE_ID_SHIFT		4

#define SPI_CMD_PREPEND_BYTE_CNT_SHIFT	8

#define SPI_CMD_ONE_BYTE_SHIFT		11

#define SPI_CMD_ONE_WIRE_SHIFT		12

#define SPI_DEV_ID_0			0

#define SPI_DEV_ID_1			1

#define SPI_DEV_ID_2			2

#define SPI_DEV_ID_3			3

/* Interrupt mask */

#define SPI_INTR_CMD_DONE		0x01

#define SPI_INTR_RX_OVERFLOW		0x02

#define SPI_INTR_TX_UNDERFLOW		0x04

#define SPI_INTR_TX_OVERFLOW		0x08

#define SPI_INTR_RX_UNDERFLOW		0x10

#define SPI_INTR_CLEAR_ALL		0x1f

/* Status */

#define SPI_RX_EMPTY			0x02

#define SPI_CMD_BUSY			0x04

#define SPI_SERIAL_BUSY			0x08

/* Clock configuration */

#define SPI_CLK_20MHZ			0x00

#define SPI_CLK_0_391MHZ		0x01

#define SPI_CLK_0_781MHZ		0x02	
/* default */

#define SPI_CLK_1_563MHZ		0x03

#define SPI_CLK_3_125MHZ		0x04

#define SPI_CLK_6_250MHZ		0x05

#define SPI_CLK_12_50MHZ		0x06

#define SPI_CLK_MASK			0x07

#define SPI_SSOFFTIME_MASK		0x38

#define SPI_SSOFFTIME_SHIFT		3

#define SPI_BYTE_SWAP			0x80


enum bcm63xx_regs_spi {
	
SPI_CMD,
	
SPI_INT_STATUS,
	
SPI_INT_MASK_ST,
	
SPI_INT_MASK,
	
SPI_ST,
	
SPI_CLK_CFG,
	
SPI_FILL_BYTE,
	
SPI_MSG_TAIL,
	
SPI_RX_TAIL,
	
SPI_MSG_CTL,
	
SPI_MSG_DATA,
	
SPI_RX_DATA,
	
SPI_MSG_TYPE_SHIFT,
	
SPI_MSG_CTL_WIDTH,
	
SPI_MSG_DATA_SIZE,
};


#define BCM63XX_SPI_MAX_PREPEND		15


#define BCM63XX_SPI_MAX_CS		8

#define BCM63XX_SPI_BUS_NUM		0


struct bcm63xx_spi {
	
struct completion	done;

	
void __iomem		*regs;
	
int			irq;

	/* Platform data */
	
const unsigned long	*reg_offsets;
	
unsigned		fifo_size;
	
unsigned int		msg_type_shift;
	
unsigned int		msg_ctl_width;

	/* data iomem */
	
u8 __iomem		*tx_io;
	
const u8 __iomem	*rx_io;

	
struct clk		*clk;
	
struct platform_device	*pdev;
};


static inline u8 bcm_spi_readb(struct bcm63xx_spi *bs, unsigned int offset) { return readb(bs->regs + bs->reg_offsets[offset]); }

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static inline u16 bcm_spi_readw(struct bcm63xx_spi *bs, unsigned int offset) { #ifdef CONFIG_CPU_BIG_ENDIAN return ioread16be(bs->regs + bs->reg_offsets[offset]); #else return readw(bs->regs + bs->reg_offsets[offset]); #endif }

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static inline void bcm_spi_writeb(struct bcm63xx_spi *bs, u8 value, unsigned int offset) { writeb(value, bs->regs + bs->reg_offsets[offset]); }

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static inline void bcm_spi_writew(struct bcm63xx_spi *bs, u16 value, unsigned int offset) { #ifdef CONFIG_CPU_BIG_ENDIAN iowrite16be(value, bs->regs + bs->reg_offsets[offset]); #else writew(value, bs->regs + bs->reg_offsets[offset]); #endif }

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static const unsigned bcm63xx_spi_freq_table[SPI_CLK_MASK][2] = { { 20000000, SPI_CLK_20MHZ }, { 12500000, SPI_CLK_12_50MHZ }, { 6250000, SPI_CLK_6_250MHZ }, { 3125000, SPI_CLK_3_125MHZ }, { 1563000, SPI_CLK_1_563MHZ }, { 781000, SPI_CLK_0_781MHZ }, { 391000, SPI_CLK_0_391MHZ } };
static void bcm63xx_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t) { struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); u8 clk_cfg, reg; int i; /* Default to lowest clock configuration */ clk_cfg = SPI_CLK_0_391MHZ; /* Find the closest clock configuration */ for (i = 0; i < SPI_CLK_MASK; i++) { if (t->speed_hz >= bcm63xx_spi_freq_table[i][0]) { clk_cfg = bcm63xx_spi_freq_table[i][1]; break; } } /* clear existing clock configuration bits of the register */ reg = bcm_spi_readb(bs, SPI_CLK_CFG); reg &= ~SPI_CLK_MASK; reg |= clk_cfg; bcm_spi_writeb(bs, reg, SPI_CLK_CFG); dev_dbg(&spi->dev, "Setting clock register to %02x (hz %d)\n", clk_cfg, t->speed_hz); }

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/* the spi->mode bits understood by this driver: */ #define MODEBITS (SPI_CPOL | SPI_CPHA)
static int bcm63xx_txrx_bufs(struct spi_device *spi, struct spi_transfer *first, unsigned int num_transfers) { struct bcm63xx_spi *bs = spi_master_get_devdata(spi->master); u16 msg_ctl; u16 cmd; unsigned int i, timeout = 0, prepend_len = 0, len = 0; struct spi_transfer *t = first; bool do_rx = false; bool do_tx = false; /* Disable the CMD_DONE interrupt */ bcm_spi_writeb(bs, 0, SPI_INT_MASK); dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n", t->tx_buf, t->rx_buf, t->len); if (num_transfers > 1 && t->tx_buf && t->len <= BCM63XX_SPI_MAX_PREPEND) prepend_len = t->len; /* prepare the buffer */ for (i = 0; i < num_transfers; i++) { if (t->tx_buf) { do_tx = true; memcpy_toio(bs->tx_io + len, t->tx_buf, t->len); /* don't prepend more than one tx */ if (t != first) prepend_len = 0; } if (t->rx_buf) { do_rx = true; /* prepend is half-duplex write only */ if (t == first) prepend_len = 0; } len += t->len; t = list_entry(t->transfer_list.next, struct spi_transfer, transfer_list); } reinit_completion(&bs->done); /* Fill in the Message control register */ msg_ctl = (len << SPI_BYTE_CNT_SHIFT); if (do_rx && do_tx && prepend_len == 0) msg_ctl |= (SPI_FD_RW << bs->msg_type_shift); else if (do_rx) msg_ctl |= (SPI_HD_R << bs->msg_type_shift); else if (do_tx) msg_ctl |= (SPI_HD_W << bs->msg_type_shift); switch (bs->msg_ctl_width) { case 8: bcm_spi_writeb(bs, msg_ctl, SPI_MSG_CTL); break; case 16: bcm_spi_writew(bs, msg_ctl, SPI_MSG_CTL); break; } /* Issue the transfer */ cmd = SPI_CMD_START_IMMEDIATE; cmd |= (prepend_len << SPI_CMD_PREPEND_BYTE_CNT_SHIFT); cmd |= (spi->chip_select << SPI_CMD_DEVICE_ID_SHIFT); bcm_spi_writew(bs, cmd, SPI_CMD); /* Enable the CMD_DONE interrupt */ bcm_spi_writeb(bs, SPI_INTR_CMD_DONE, SPI_INT_MASK); timeout = wait_for_completion_timeout(&bs->done, HZ); if (!timeout) return -ETIMEDOUT; if (!do_rx) return 0; len = 0; t = first; /* Read out all the data */ for (i = 0; i < num_transfers; i++) { if (t->rx_buf) memcpy_fromio(t->rx_buf, bs->rx_io + len, t->len); if (t != first || prepend_len == 0) len += t->len; t = list_entry(t->transfer_list.next, struct spi_transfer, transfer_list); } return 0; }

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static int bcm63xx_spi_transfer_one(struct spi_master *master, struct spi_message *m) { struct bcm63xx_spi *bs = spi_master_get_devdata(master); struct spi_transfer *t, *first = NULL; struct spi_device *spi = m->spi; int status = 0; unsigned int n_transfers = 0, total_len = 0; bool can_use_prepend = false; /* * This SPI controller does not support keeping CS active after a * transfer. * Work around this by merging as many transfers we can into one big * full-duplex transfers. */ list_for_each_entry(t, &m->transfers, transfer_list) { if (!first) first = t; n_transfers++; total_len += t->len; if (n_transfers == 2 && !first->rx_buf && !t->tx_buf && first->len <= BCM63XX_SPI_MAX_PREPEND) can_use_prepend = true; else if (can_use_prepend && t->tx_buf) can_use_prepend = false; /* we can only transfer one fifo worth of data */ if ((can_use_prepend && total_len > (bs->fifo_size + BCM63XX_SPI_MAX_PREPEND)) || (!can_use_prepend && total_len > bs->fifo_size)) { dev_err(&spi->dev, "unable to do transfers larger than FIFO size (%i > %i)\n", total_len, bs->fifo_size); status = -EINVAL; goto exit; } /* all combined transfers have to have the same speed */ if (t->speed_hz != first->speed_hz) { dev_err(&spi->dev, "unable to change speed between transfers\n"); status = -EINVAL; goto exit; } /* CS will be deasserted directly after transfer */ if (t->delay_usecs) { dev_err(&spi->dev, "unable to keep CS asserted after transfer\n"); status = -EINVAL; goto exit; } if (t->cs_change || list_is_last(&t->transfer_list, &m->transfers)) { /* configure adapter for a new transfer */ bcm63xx_spi_setup_transfer(spi, first); /* send the data */ status = bcm63xx_txrx_bufs(spi, first, n_transfers); if (status) goto exit; m->actual_length += total_len; first = NULL; n_transfers = 0; total_len = 0; can_use_prepend = false; } } exit: m->status = status; spi_finalize_current_message(master); return 0; }

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/* This driver supports single master mode only. Hence * CMD_DONE is the only interrupt we care about */
static irqreturn_t bcm63xx_spi_interrupt(int irq, void *dev_id) { struct spi_master *master = (struct spi_master *)dev_id; struct bcm63xx_spi *bs = spi_master_get_devdata(master); u8 intr; /* Read interupts and clear them immediately */ intr = bcm_spi_readb(bs, SPI_INT_STATUS); bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS); bcm_spi_writeb(bs, 0, SPI_INT_MASK); /* A transfer completed */ if (intr & SPI_INTR_CMD_DONE) complete(&bs->done); return IRQ_HANDLED; }

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static const unsigned long bcm6348_spi_reg_offsets[] = { [SPI_CMD] = SPI_6348_CMD, [SPI_INT_STATUS] = SPI_6348_INT_STATUS, [SPI_INT_MASK_ST] = SPI_6348_INT_MASK_ST, [SPI_INT_MASK] = SPI_6348_INT_MASK, [SPI_ST] = SPI_6348_ST, [SPI_CLK_CFG] = SPI_6348_CLK_CFG, [SPI_FILL_BYTE] = SPI_6348_FILL_BYTE, [SPI_MSG_TAIL] = SPI_6348_MSG_TAIL, [SPI_RX_TAIL] = SPI_6348_RX_TAIL, [SPI_MSG_CTL] = SPI_6348_MSG_CTL, [SPI_MSG_DATA] = SPI_6348_MSG_DATA, [SPI_RX_DATA] = SPI_6348_RX_DATA, [SPI_MSG_TYPE_SHIFT] = SPI_6348_MSG_TYPE_SHIFT, [SPI_MSG_CTL_WIDTH] = SPI_6348_MSG_CTL_WIDTH, [SPI_MSG_DATA_SIZE] = SPI_6348_MSG_DATA_SIZE, }; static const unsigned long bcm6358_spi_reg_offsets[] = { [SPI_CMD] = SPI_6358_CMD, [SPI_INT_STATUS] = SPI_6358_INT_STATUS, [SPI_INT_MASK_ST] = SPI_6358_INT_MASK_ST, [SPI_INT_MASK] = SPI_6358_INT_MASK, [SPI_ST] = SPI_6358_ST, [SPI_CLK_CFG] = SPI_6358_CLK_CFG, [SPI_FILL_BYTE] = SPI_6358_FILL_BYTE, [SPI_MSG_TAIL] = SPI_6358_MSG_TAIL, [SPI_RX_TAIL] = SPI_6358_RX_TAIL, [SPI_MSG_CTL] = SPI_6358_MSG_CTL, [SPI_MSG_DATA] = SPI_6358_MSG_DATA, [SPI_RX_DATA] = SPI_6358_RX_DATA, [SPI_MSG_TYPE_SHIFT] = SPI_6358_MSG_TYPE_SHIFT, [SPI_MSG_CTL_WIDTH] = SPI_6358_MSG_CTL_WIDTH, [SPI_MSG_DATA_SIZE] = SPI_6358_MSG_DATA_SIZE, }; static const struct platform_device_id bcm63xx_spi_dev_match[] = { { .name = "bcm6348-spi", .driver_data = (unsigned long)bcm6348_spi_reg_offsets, }, { .name = "bcm6358-spi", .driver_data = (unsigned long)bcm6358_spi_reg_offsets, }, { }, };
static int bcm63xx_spi_probe(struct platform_device *pdev) { struct resource *r; const unsigned long *bcm63xx_spireg; struct device *dev = &pdev->dev; int irq; struct spi_master *master; struct clk *clk; struct bcm63xx_spi *bs; int ret; if (!pdev->id_entry->driver_data) return -EINVAL; bcm63xx_spireg = (const unsigned long *)pdev->id_entry->driver_data; irq = platform_get_irq(pdev, 0); if (irq < 0) { dev_err(dev, "no irq\n"); return -ENXIO; } clk = devm_clk_get(dev, "spi"); if (IS_ERR(clk)) { dev_err(dev, "no clock for device\n"); return PTR_ERR(clk); } master = spi_alloc_master(dev, sizeof(*bs)); if (!master) { dev_err(dev, "out of memory\n"); return -ENOMEM; } bs = spi_master_get_devdata(master); init_completion(&bs->done); platform_set_drvdata(pdev, master); bs->pdev = pdev; r = platform_get_resource(pdev, IORESOURCE_MEM, 0); bs->regs = devm_ioremap_resource(&pdev->dev, r); if (IS_ERR(bs->regs)) { ret = PTR_ERR(bs->regs); goto out_err; } bs->irq = irq; bs->clk = clk; bs->reg_offsets = bcm63xx_spireg; bs->fifo_size = bs->reg_offsets[SPI_MSG_DATA_SIZE]; ret = devm_request_irq(&pdev->dev, irq, bcm63xx_spi_interrupt, 0, pdev->name, master); if (ret) { dev_err(dev, "unable to request irq\n"); goto out_err; } master->bus_num = BCM63XX_SPI_BUS_NUM; master->num_chipselect = BCM63XX_SPI_MAX_CS; master->transfer_one_message = bcm63xx_spi_transfer_one; master->mode_bits = MODEBITS; master->bits_per_word_mask = SPI_BPW_MASK(8); master->auto_runtime_pm = true; bs->msg_type_shift = bs->reg_offsets[SPI_MSG_TYPE_SHIFT]; bs->msg_ctl_width = bs->reg_offsets[SPI_MSG_CTL_WIDTH]; bs->tx_io = (u8 *)(bs->regs + bs->reg_offsets[SPI_MSG_DATA]); bs->rx_io = (const u8 *)(bs->regs + bs->reg_offsets[SPI_RX_DATA]); /* Initialize hardware */ ret = clk_prepare_enable(bs->clk); if (ret) goto out_err; bcm_spi_writeb(bs, SPI_INTR_CLEAR_ALL, SPI_INT_STATUS); /* register and we are done */ ret = devm_spi_register_master(dev, master); if (ret) { dev_err(dev, "spi register failed\n"); goto out_clk_disable; } dev_info(dev, "at %pr (irq %d, FIFOs size %d)\n", r, irq, bs->fifo_size); return 0; out_clk_disable: clk_disable_unprepare(clk); out_err: spi_master_put(master); return ret; }

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Jingoo Han101.98%211.11%
Stephen Warren91.79%15.56%
Axel Lin81.59%15.56%
Mark Brown61.19%15.56%
Arnd Bergmann10.20%15.56%
Total504100.00%18100.00%


static int bcm63xx_spi_remove(struct platform_device *pdev) { struct spi_master *master = platform_get_drvdata(pdev); struct bcm63xx_spi *bs = spi_master_get_devdata(master); /* reset spi block */ bcm_spi_writeb(bs, 0, SPI_INT_MASK); /* HW shutdown */ clk_disable_unprepare(bs->clk); return 0; }

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#ifdef CONFIG_PM_SLEEP
static int bcm63xx_spi_suspend(struct device *dev) { struct spi_master *master = dev_get_drvdata(dev); struct bcm63xx_spi *bs = spi_master_get_devdata(master); spi_master_suspend(master); clk_disable_unprepare(bs->clk); return 0; }

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static int bcm63xx_spi_resume(struct device *dev) { struct spi_master *master = dev_get_drvdata(dev); struct bcm63xx_spi *bs = spi_master_get_devdata(master); int ret; ret = clk_prepare_enable(bs->clk); if (ret) return ret; spi_master_resume(master); return 0; }

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#endif static const struct dev_pm_ops bcm63xx_spi_pm_ops = { SET_SYSTEM_SLEEP_PM_OPS(bcm63xx_spi_suspend, bcm63xx_spi_resume) }; static struct platform_driver bcm63xx_spi_driver = { .driver = { .name = "bcm63xx-spi", .pm = &bcm63xx_spi_pm_ops, }, .id_table = bcm63xx_spi_dev_match, .probe = bcm63xx_spi_probe, .remove = bcm63xx_spi_remove, }; module_platform_driver(bcm63xx_spi_driver); MODULE_ALIAS("platform:bcm63xx_spi"); MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>"); MODULE_AUTHOR("Tanguy Bouzeloc <tanguy.bouzeloc@efixo.com>"); MODULE_DESCRIPTION("Broadcom BCM63xx SPI Controller driver"); MODULE_LICENSE("GPL");

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Axel Lin110.41%26.45%
Jingoo Han100.37%26.45%
Stephen Warren90.33%13.23%
Mark Brown60.22%13.23%
Geert Uytterhoeven50.19%13.23%
Jarkko Nikula10.04%13.23%
Arnd Bergmann10.04%13.23%
Total2688100.00%31100.00%
Directory: drivers/spi
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