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540 lines
15 KiB
C
540 lines
15 KiB
C
/*
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* Driver for Broadcom BCM2835 auxiliary SPI Controllers
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*
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* the driver does not rely on the native chipselects at all
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* but only uses the gpio type chipselects
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*
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* Based on: spi-bcm2835.c
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*
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* Copyright (C) 2015 Martin Sperl
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/clk.h>
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#include <linux/completion.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/interrupt.h>
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#include <linux/io.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_address.h>
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#include <linux/of_device.h>
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#include <linux/of_gpio.h>
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#include <linux/of_irq.h>
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#include <linux/regmap.h>
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#include <linux/spi/spi.h>
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#include <linux/spinlock.h>
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/*
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* spi register defines
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*
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* note there is garbage in the "official" documentation,
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* so some data is taken from the file:
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* brcm_usrlib/dag/vmcsx/vcinclude/bcm2708_chip/aux_io.h
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* inside of:
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* http://www.broadcom.com/docs/support/videocore/Brcm_Android_ICS_Graphics_Stack.tar.gz
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*/
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/* SPI register offsets */
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#define BCM2835_AUX_SPI_CNTL0 0x00
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#define BCM2835_AUX_SPI_CNTL1 0x04
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#define BCM2835_AUX_SPI_STAT 0x08
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#define BCM2835_AUX_SPI_PEEK 0x0C
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#define BCM2835_AUX_SPI_IO 0x20
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#define BCM2835_AUX_SPI_TXHOLD 0x30
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/* Bitfields in CNTL0 */
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#define BCM2835_AUX_SPI_CNTL0_SPEED 0xFFF00000
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#define BCM2835_AUX_SPI_CNTL0_SPEED_MAX 0xFFF
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#define BCM2835_AUX_SPI_CNTL0_SPEED_SHIFT 20
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#define BCM2835_AUX_SPI_CNTL0_CS 0x000E0000
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#define BCM2835_AUX_SPI_CNTL0_POSTINPUT 0x00010000
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#define BCM2835_AUX_SPI_CNTL0_VAR_CS 0x00008000
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#define BCM2835_AUX_SPI_CNTL0_VAR_WIDTH 0x00004000
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#define BCM2835_AUX_SPI_CNTL0_DOUTHOLD 0x00003000
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#define BCM2835_AUX_SPI_CNTL0_ENABLE 0x00000800
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#define BCM2835_AUX_SPI_CNTL0_IN_RISING 0x00000400
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#define BCM2835_AUX_SPI_CNTL0_CLEARFIFO 0x00000200
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#define BCM2835_AUX_SPI_CNTL0_OUT_RISING 0x00000100
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#define BCM2835_AUX_SPI_CNTL0_CPOL 0x00000080
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#define BCM2835_AUX_SPI_CNTL0_MSBF_OUT 0x00000040
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#define BCM2835_AUX_SPI_CNTL0_SHIFTLEN 0x0000003F
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/* Bitfields in CNTL1 */
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#define BCM2835_AUX_SPI_CNTL1_CSHIGH 0x00000700
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#define BCM2835_AUX_SPI_CNTL1_TXEMPTY 0x00000080
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#define BCM2835_AUX_SPI_CNTL1_IDLE 0x00000040
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#define BCM2835_AUX_SPI_CNTL1_MSBF_IN 0x00000002
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#define BCM2835_AUX_SPI_CNTL1_KEEP_IN 0x00000001
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/* Bitfields in STAT */
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#define BCM2835_AUX_SPI_STAT_TX_LVL 0xFF000000
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#define BCM2835_AUX_SPI_STAT_RX_LVL 0x00FF0000
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#define BCM2835_AUX_SPI_STAT_TX_FULL 0x00000400
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#define BCM2835_AUX_SPI_STAT_TX_EMPTY 0x00000200
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#define BCM2835_AUX_SPI_STAT_RX_FULL 0x00000100
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#define BCM2835_AUX_SPI_STAT_RX_EMPTY 0x00000080
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#define BCM2835_AUX_SPI_STAT_BUSY 0x00000040
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#define BCM2835_AUX_SPI_STAT_BITCOUNT 0x0000003F
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/* timeout values */
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#define BCM2835_AUX_SPI_POLLING_LIMIT_US 30
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#define BCM2835_AUX_SPI_POLLING_JIFFIES 2
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struct bcm2835aux_spi {
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void __iomem *regs;
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struct clk *clk;
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int irq;
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u32 cntl[2];
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const u8 *tx_buf;
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u8 *rx_buf;
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int tx_len;
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int rx_len;
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int pending;
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};
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static inline u32 bcm2835aux_rd(struct bcm2835aux_spi *bs, unsigned reg)
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{
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return readl(bs->regs + reg);
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}
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static inline void bcm2835aux_wr(struct bcm2835aux_spi *bs, unsigned reg,
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u32 val)
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{
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writel(val, bs->regs + reg);
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}
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static inline void bcm2835aux_rd_fifo(struct bcm2835aux_spi *bs)
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{
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u32 data;
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int count = min(bs->rx_len, 3);
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data = bcm2835aux_rd(bs, BCM2835_AUX_SPI_IO);
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if (bs->rx_buf) {
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switch (count) {
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case 4:
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*bs->rx_buf++ = (data >> 24) & 0xff;
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/* fallthrough */
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case 3:
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*bs->rx_buf++ = (data >> 16) & 0xff;
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/* fallthrough */
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case 2:
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*bs->rx_buf++ = (data >> 8) & 0xff;
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/* fallthrough */
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case 1:
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*bs->rx_buf++ = (data >> 0) & 0xff;
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/* fallthrough - no default */
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}
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}
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bs->rx_len -= count;
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bs->pending -= count;
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}
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static inline void bcm2835aux_wr_fifo(struct bcm2835aux_spi *bs)
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{
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u32 data;
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u8 byte;
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int count;
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int i;
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/* gather up to 3 bytes to write to the FIFO */
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count = min(bs->tx_len, 3);
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data = 0;
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for (i = 0; i < count; i++) {
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byte = bs->tx_buf ? *bs->tx_buf++ : 0;
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data |= byte << (8 * (2 - i));
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}
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/* and set the variable bit-length */
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data |= (count * 8) << 24;
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/* and decrement length */
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bs->tx_len -= count;
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bs->pending += count;
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/* write to the correct TX-register */
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if (bs->tx_len)
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bcm2835aux_wr(bs, BCM2835_AUX_SPI_TXHOLD, data);
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else
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bcm2835aux_wr(bs, BCM2835_AUX_SPI_IO, data);
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}
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static void bcm2835aux_spi_reset_hw(struct bcm2835aux_spi *bs)
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{
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/* disable spi clearing fifo and interrupts */
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bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL1, 0);
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bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL0,
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BCM2835_AUX_SPI_CNTL0_CLEARFIFO);
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}
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static irqreturn_t bcm2835aux_spi_interrupt(int irq, void *dev_id)
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{
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struct spi_master *master = dev_id;
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struct bcm2835aux_spi *bs = spi_master_get_devdata(master);
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irqreturn_t ret = IRQ_NONE;
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/* check if we have data to read */
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while (bs->rx_len &&
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(!(bcm2835aux_rd(bs, BCM2835_AUX_SPI_STAT) &
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BCM2835_AUX_SPI_STAT_RX_EMPTY))) {
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bcm2835aux_rd_fifo(bs);
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ret = IRQ_HANDLED;
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}
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/* check if we have data to write */
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while (bs->tx_len &&
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(bs->pending < 12) &&
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(!(bcm2835aux_rd(bs, BCM2835_AUX_SPI_STAT) &
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BCM2835_AUX_SPI_STAT_TX_FULL))) {
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bcm2835aux_wr_fifo(bs);
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ret = IRQ_HANDLED;
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}
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/* and check if we have reached "done" */
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while (bs->rx_len &&
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(!(bcm2835aux_rd(bs, BCM2835_AUX_SPI_STAT) &
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BCM2835_AUX_SPI_STAT_BUSY))) {
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bcm2835aux_rd_fifo(bs);
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ret = IRQ_HANDLED;
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}
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if (!bs->tx_len) {
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/* disable tx fifo empty interrupt */
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bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL1, bs->cntl[1] |
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BCM2835_AUX_SPI_CNTL1_IDLE);
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}
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/* and if rx_len is 0 then disable interrupts and wake up completion */
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if (!bs->rx_len) {
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bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL1, bs->cntl[1]);
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complete(&master->xfer_completion);
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}
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/* and return */
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return ret;
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}
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static int __bcm2835aux_spi_transfer_one_irq(struct spi_master *master,
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struct spi_device *spi,
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struct spi_transfer *tfr)
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{
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struct bcm2835aux_spi *bs = spi_master_get_devdata(master);
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/* enable interrupts */
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bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL1, bs->cntl[1] |
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BCM2835_AUX_SPI_CNTL1_TXEMPTY |
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BCM2835_AUX_SPI_CNTL1_IDLE);
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/* and wait for finish... */
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return 1;
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}
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static int bcm2835aux_spi_transfer_one_irq(struct spi_master *master,
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struct spi_device *spi,
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struct spi_transfer *tfr)
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{
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struct bcm2835aux_spi *bs = spi_master_get_devdata(master);
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/* fill in registers and fifos before enabling interrupts */
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bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL1, bs->cntl[1]);
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bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL0, bs->cntl[0]);
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/* fill in tx fifo with data before enabling interrupts */
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while ((bs->tx_len) &&
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(bs->pending < 12) &&
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(!(bcm2835aux_rd(bs, BCM2835_AUX_SPI_STAT) &
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BCM2835_AUX_SPI_STAT_TX_FULL))) {
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bcm2835aux_wr_fifo(bs);
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}
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/* now run the interrupt mode */
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return __bcm2835aux_spi_transfer_one_irq(master, spi, tfr);
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}
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static int bcm2835aux_spi_transfer_one_poll(struct spi_master *master,
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struct spi_device *spi,
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struct spi_transfer *tfr)
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{
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struct bcm2835aux_spi *bs = spi_master_get_devdata(master);
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unsigned long timeout;
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u32 stat;
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/* configure spi */
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bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL1, bs->cntl[1]);
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bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL0, bs->cntl[0]);
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/* set the timeout */
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timeout = jiffies + BCM2835_AUX_SPI_POLLING_JIFFIES;
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/* loop until finished the transfer */
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while (bs->rx_len) {
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/* read status */
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stat = bcm2835aux_rd(bs, BCM2835_AUX_SPI_STAT);
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/* fill in tx fifo with remaining data */
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if ((bs->tx_len) && (!(stat & BCM2835_AUX_SPI_STAT_TX_FULL))) {
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bcm2835aux_wr_fifo(bs);
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continue;
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}
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/* read data from fifo for both cases */
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if (!(stat & BCM2835_AUX_SPI_STAT_RX_EMPTY)) {
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bcm2835aux_rd_fifo(bs);
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continue;
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}
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if (!(stat & BCM2835_AUX_SPI_STAT_BUSY)) {
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bcm2835aux_rd_fifo(bs);
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continue;
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}
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/* there is still data pending to read check the timeout */
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if (bs->rx_len && time_after(jiffies, timeout)) {
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dev_dbg_ratelimited(&spi->dev,
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"timeout period reached: jiffies: %lu remaining tx/rx: %d/%d - falling back to interrupt mode\n",
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jiffies - timeout,
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bs->tx_len, bs->rx_len);
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/* forward to interrupt handler */
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return __bcm2835aux_spi_transfer_one_irq(master,
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spi, tfr);
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}
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}
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/* and return without waiting for completion */
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return 0;
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}
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static int bcm2835aux_spi_transfer_one(struct spi_master *master,
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struct spi_device *spi,
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struct spi_transfer *tfr)
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{
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struct bcm2835aux_spi *bs = spi_master_get_devdata(master);
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unsigned long spi_hz, clk_hz, speed;
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unsigned long spi_used_hz;
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unsigned long long xfer_time_us;
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/* calculate the registers to handle
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*
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* note that we use the variable data mode, which
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* is not optimal for longer transfers as we waste registers
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* resulting (potentially) in more interrupts when transferring
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* more than 12 bytes
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*/
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/* set clock */
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spi_hz = tfr->speed_hz;
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clk_hz = clk_get_rate(bs->clk);
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if (spi_hz >= clk_hz / 2) {
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speed = 0;
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} else if (spi_hz) {
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speed = DIV_ROUND_UP(clk_hz, 2 * spi_hz) - 1;
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if (speed > BCM2835_AUX_SPI_CNTL0_SPEED_MAX)
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speed = BCM2835_AUX_SPI_CNTL0_SPEED_MAX;
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} else { /* the slowest we can go */
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speed = BCM2835_AUX_SPI_CNTL0_SPEED_MAX;
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}
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/* mask out old speed from previous spi_transfer */
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bs->cntl[0] &= ~(BCM2835_AUX_SPI_CNTL0_SPEED);
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/* set the new speed */
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bs->cntl[0] |= speed << BCM2835_AUX_SPI_CNTL0_SPEED_SHIFT;
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spi_used_hz = clk_hz / (2 * (speed + 1));
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/* set transmit buffers and length */
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bs->tx_buf = tfr->tx_buf;
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bs->rx_buf = tfr->rx_buf;
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bs->tx_len = tfr->len;
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bs->rx_len = tfr->len;
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bs->pending = 0;
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/* calculate the estimated time in us the transfer runs
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* note that there are are 2 idle clocks after each
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* chunk getting transferred - in our case the chunk size
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* is 3 bytes, so we approximate this by 9 bits/byte
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*/
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xfer_time_us = tfr->len * 9 * 1000000;
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do_div(xfer_time_us, spi_used_hz);
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/* run in polling mode for short transfers */
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if (xfer_time_us < BCM2835_AUX_SPI_POLLING_LIMIT_US)
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return bcm2835aux_spi_transfer_one_poll(master, spi, tfr);
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/* run in interrupt mode for all others */
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return bcm2835aux_spi_transfer_one_irq(master, spi, tfr);
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}
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static int bcm2835aux_spi_prepare_message(struct spi_master *master,
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struct spi_message *msg)
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{
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struct spi_device *spi = msg->spi;
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struct bcm2835aux_spi *bs = spi_master_get_devdata(master);
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bs->cntl[0] = BCM2835_AUX_SPI_CNTL0_ENABLE |
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BCM2835_AUX_SPI_CNTL0_VAR_WIDTH |
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BCM2835_AUX_SPI_CNTL0_MSBF_OUT;
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bs->cntl[1] = BCM2835_AUX_SPI_CNTL1_MSBF_IN;
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/* handle all the modes */
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if (spi->mode & SPI_CPOL) {
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bs->cntl[0] |= BCM2835_AUX_SPI_CNTL0_CPOL;
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bs->cntl[0] |= BCM2835_AUX_SPI_CNTL0_OUT_RISING;
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} else {
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bs->cntl[0] |= BCM2835_AUX_SPI_CNTL0_IN_RISING;
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}
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bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL1, bs->cntl[1]);
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bcm2835aux_wr(bs, BCM2835_AUX_SPI_CNTL0, bs->cntl[0]);
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return 0;
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}
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static int bcm2835aux_spi_unprepare_message(struct spi_master *master,
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struct spi_message *msg)
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{
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struct bcm2835aux_spi *bs = spi_master_get_devdata(master);
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bcm2835aux_spi_reset_hw(bs);
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return 0;
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}
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static void bcm2835aux_spi_handle_err(struct spi_master *master,
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struct spi_message *msg)
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{
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struct bcm2835aux_spi *bs = spi_master_get_devdata(master);
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bcm2835aux_spi_reset_hw(bs);
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}
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static int bcm2835aux_spi_probe(struct platform_device *pdev)
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{
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struct spi_master *master;
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struct bcm2835aux_spi *bs;
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struct resource *res;
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unsigned long clk_hz;
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int err;
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master = spi_alloc_master(&pdev->dev, sizeof(*bs));
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if (!master) {
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dev_err(&pdev->dev, "spi_alloc_master() failed\n");
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return -ENOMEM;
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}
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platform_set_drvdata(pdev, master);
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master->mode_bits = (SPI_CPOL | SPI_CS_HIGH | SPI_NO_CS);
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master->bits_per_word_mask = SPI_BPW_MASK(8);
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master->num_chipselect = -1;
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master->transfer_one = bcm2835aux_spi_transfer_one;
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master->handle_err = bcm2835aux_spi_handle_err;
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master->prepare_message = bcm2835aux_spi_prepare_message;
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master->unprepare_message = bcm2835aux_spi_unprepare_message;
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master->dev.of_node = pdev->dev.of_node;
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bs = spi_master_get_devdata(master);
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/* the main area */
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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bs->regs = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(bs->regs)) {
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err = PTR_ERR(bs->regs);
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goto out_master_put;
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}
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bs->clk = devm_clk_get(&pdev->dev, NULL);
|
|
if ((!bs->clk) || (IS_ERR(bs->clk))) {
|
|
err = PTR_ERR(bs->clk);
|
|
dev_err(&pdev->dev, "could not get clk: %d\n", err);
|
|
goto out_master_put;
|
|
}
|
|
|
|
bs->irq = platform_get_irq(pdev, 0);
|
|
if (bs->irq <= 0) {
|
|
dev_err(&pdev->dev, "could not get IRQ: %d\n", bs->irq);
|
|
err = bs->irq ? bs->irq : -ENODEV;
|
|
goto out_master_put;
|
|
}
|
|
|
|
/* this also enables the HW block */
|
|
err = clk_prepare_enable(bs->clk);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "could not prepare clock: %d\n", err);
|
|
goto out_master_put;
|
|
}
|
|
|
|
/* just checking if the clock returns a sane value */
|
|
clk_hz = clk_get_rate(bs->clk);
|
|
if (!clk_hz) {
|
|
dev_err(&pdev->dev, "clock returns 0 Hz\n");
|
|
err = -ENODEV;
|
|
goto out_clk_disable;
|
|
}
|
|
|
|
/* reset SPI-HW block */
|
|
bcm2835aux_spi_reset_hw(bs);
|
|
|
|
err = devm_request_irq(&pdev->dev, bs->irq,
|
|
bcm2835aux_spi_interrupt,
|
|
IRQF_SHARED,
|
|
dev_name(&pdev->dev), master);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "could not request IRQ: %d\n", err);
|
|
goto out_clk_disable;
|
|
}
|
|
|
|
err = devm_spi_register_master(&pdev->dev, master);
|
|
if (err) {
|
|
dev_err(&pdev->dev, "could not register SPI master: %d\n", err);
|
|
goto out_clk_disable;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_clk_disable:
|
|
clk_disable_unprepare(bs->clk);
|
|
out_master_put:
|
|
spi_master_put(master);
|
|
return err;
|
|
}
|
|
|
|
static int bcm2835aux_spi_remove(struct platform_device *pdev)
|
|
{
|
|
struct spi_master *master = platform_get_drvdata(pdev);
|
|
struct bcm2835aux_spi *bs = spi_master_get_devdata(master);
|
|
|
|
bcm2835aux_spi_reset_hw(bs);
|
|
|
|
/* disable the HW block by releasing the clock */
|
|
clk_disable_unprepare(bs->clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id bcm2835aux_spi_match[] = {
|
|
{ .compatible = "brcm,bcm2835-aux-spi", },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, bcm2835aux_spi_match);
|
|
|
|
static struct platform_driver bcm2835aux_spi_driver = {
|
|
.driver = {
|
|
.name = "spi-bcm2835aux",
|
|
.of_match_table = bcm2835aux_spi_match,
|
|
},
|
|
.probe = bcm2835aux_spi_probe,
|
|
.remove = bcm2835aux_spi_remove,
|
|
};
|
|
module_platform_driver(bcm2835aux_spi_driver);
|
|
|
|
MODULE_DESCRIPTION("SPI controller driver for Broadcom BCM2835 aux");
|
|
MODULE_AUTHOR("Martin Sperl <kernel@martin.sperl.org>");
|
|
MODULE_LICENSE("GPL v2");
|