![Christian Gmeiner](/assets/img/avatar_default.png)
In some rare cases I see the following 'task blocked' information. It looks like the PIO transfer has some problems and never succeeds. Make use of wait_for_completion_timeout(..) to detect this case and return -ETIMEDOUT. [ 240.246067] INFO: task hexdump:1660 blocked for more than 120 seconds. [ 240.246089] Not tainted 4.1.17 0000001 [ 240.246099] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 240.246109] hexdump D c0575548 0 1660 1 0x00000000 [ 240.246132] Backtrace: [ 240.246166] [<c057524c>] (__schedule) from [<c0575a84>] (schedule+0x40/0xa4) [ 240.246176] r10:00000000 r9:c07f1300 r8:c07b8408 r7:c0576518 r6:7fffffff r5:7fffffff [ 240.246210] r4:ee972e7c [ 240.246233] [<c0575a44>] (schedule) from [<c0578544>] (schedule_timeout+0x174/0x274) [ 240.246254] [<c05783d0>] (schedule_timeout) from [<c0576518>] (wait_for_common+0xc0/0x164) [ 240.246263] r10:00000000 r9:c07f1300 r8:00000002 r7:00000000 r6:7fffffff r5:ee972e78 [ 240.246294] r4:ee972e7c [ 240.246314] [<c0576458>] (wait_for_common) from [<c05765dc>] (wait_for_completion+0x20/0x24) [ 240.246324] r10:ee972e50 r8:00000001 r7:c3976200 r6:ee972c00 r5:ee972e50 r4:c2c87d28 [ 240.246367] [<c05765bc>] (wait_for_completion) from [<c03f6b04>] (spi_imx_transfer+0xe8/0x3cc) [ 240.246393] [<c03f6a1c>] (spi_imx_transfer) from [<c03f50e4>] (spi_bitbang_transfer_one+0xb4/0x250) [ 240.246403] r10:ee972e50 r8:00000001 r7:00000000 r6:c2c87da0 r5:00000000 r4:c2c87d28 [ 240.246443] [<c03f5030>] (spi_bitbang_transfer_one) from [<c03f36e8>] (__spi_pump_messages+0x36c/0x6b4) [ 240.246452] r10:ee9e5010 r9:00000001 r8:ee9e5010 r7:00000000 r6:c2c87da0 r5:c2c87d6c [ 240.246483] r4:ee972c00 [ 240.246503] [<c03f337c>] (__spi_pump_messages) from [<c03f3b68>] (__spi_sync+0x138/0x1e4) [ 240.246512] r10:00000000 r9:00000000 r8:c03f25a8 r7:00000000 r6:ee972c00 r5:c3976200 [ 240.246542] r4:c2c87da0 [ 240.246562] [<c03f3a30>] (__spi_sync) from [<c03f3c50>] (spi_sync+0x1c/0x20) [ 240.246571] r10:00040000 r9:00000000 r8:c3976200 r7:00000000 r6:ee973300 r5:c2c87da0 [ 240.246602] r4:ee973014 [ 240.246623] [<c03f3c34>] (spi_sync) from [<c03f0210>] (m25p80_read+0xf8/0x124) [ 240.246641] [<c03f0118>] (m25p80_read) from [<c03f1528>] (spi_nor_read+0x64/0x80) [ 240.246651] r10:00004000 r8:00004000 r7:00000000 r6:00040000 r5:00000000 r4:ee973014 [ 240.246698] [<c03f14c4>] (spi_nor_read) from [<c03cdcb4>] (mtd_read+0x98/0xcc) [ 240.246708] r7:c2c87ea0 r6:ee973098 r5:00000000 r4:001c0000 [ 240.246740] [<c03cdc1c>] (mtd_read) from [<c03d300c>] (mtdchar_read+0xcc/0x204) [ 240.246750] r9:ed424000 r8:00000000 r7:b495d018 r6:c2c87f78 r5:00000000 r4:00040000 [ 240.246793] [<c03d2f40>] (mtdchar_read) from [<c013b1c4>] (__vfs_read+0x3c/0xe0) [ 240.246803] r10:00004000 r9:00000000 r8:c2c87f78 r7:b495d018 r6:c2c87f78 r5:c05c8104 [ 240.246833] r4:c32fe600 [ 240.246852] [<c013b188>] (__vfs_read) from [<c013befc>] (vfs_read+0x98/0x154) [ 240.246861] r10:00000000 r8:00040000 r7:00004000 r6:c2c87f78 r5:b495d018 r4:c32fe600 [ 240.246899] [<c013be64>] (vfs_read) from [<c013c008>] (SyS_read+0x50/0x90) [ 240.246908] r10:00000000 r8:00040000 r7:b495d018 r6:00004000 r5:c32fe601 r4:c32fe600 [ 240.246953] [<c013bfb8>] (SyS_read) from [<c000fa60>] (ret_fast_syscall+0x0/0x3c) [ 240.246962] r9:c2c86000 r8:c000fc04 r7:00000003 r6:00004000 r5:00000000 r4:b495d018 Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
1314 lines
34 KiB
C
1314 lines
34 KiB
C
/*
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* Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved.
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* Copyright (C) 2008 Juergen Beisert
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the
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* Free Software Foundation
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* 51 Franklin Street, Fifth Floor
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* Boston, MA 02110-1301, USA.
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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/dmaengine.h>
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#include <linux/dma-mapping.h>
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#include <linux/err.h>
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#include <linux/gpio.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/spi/spi.h>
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#include <linux/spi/spi_bitbang.h>
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#include <linux/types.h>
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#include <linux/of.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/platform_data/dma-imx.h>
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#include <linux/platform_data/spi-imx.h>
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#define DRIVER_NAME "spi_imx"
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#define MXC_CSPIRXDATA 0x00
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#define MXC_CSPITXDATA 0x04
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#define MXC_CSPICTRL 0x08
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#define MXC_CSPIINT 0x0c
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#define MXC_RESET 0x1c
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/* generic defines to abstract from the different register layouts */
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#define MXC_INT_RR (1 << 0) /* Receive data ready interrupt */
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#define MXC_INT_TE (1 << 1) /* Transmit FIFO empty interrupt */
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/* The maximum bytes that a sdma BD can transfer.*/
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#define MAX_SDMA_BD_BYTES (1 << 15)
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struct spi_imx_config {
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unsigned int speed_hz;
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unsigned int bpw;
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};
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enum spi_imx_devtype {
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IMX1_CSPI,
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IMX21_CSPI,
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IMX27_CSPI,
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IMX31_CSPI,
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IMX35_CSPI, /* CSPI on all i.mx except above */
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IMX51_ECSPI, /* ECSPI on i.mx51 and later */
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};
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struct spi_imx_data;
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struct spi_imx_devtype_data {
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void (*intctrl)(struct spi_imx_data *, int);
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int (*config)(struct spi_device *, struct spi_imx_config *);
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void (*trigger)(struct spi_imx_data *);
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int (*rx_available)(struct spi_imx_data *);
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void (*reset)(struct spi_imx_data *);
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enum spi_imx_devtype devtype;
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};
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struct spi_imx_data {
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struct spi_bitbang bitbang;
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struct device *dev;
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struct completion xfer_done;
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void __iomem *base;
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unsigned long base_phys;
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struct clk *clk_per;
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struct clk *clk_ipg;
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unsigned long spi_clk;
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unsigned int spi_bus_clk;
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unsigned int bytes_per_word;
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unsigned int count;
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void (*tx)(struct spi_imx_data *);
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void (*rx)(struct spi_imx_data *);
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void *rx_buf;
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const void *tx_buf;
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unsigned int txfifo; /* number of words pushed in tx FIFO */
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/* DMA */
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bool usedma;
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u32 wml;
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struct completion dma_rx_completion;
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struct completion dma_tx_completion;
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const struct spi_imx_devtype_data *devtype_data;
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};
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static inline int is_imx27_cspi(struct spi_imx_data *d)
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{
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return d->devtype_data->devtype == IMX27_CSPI;
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}
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static inline int is_imx35_cspi(struct spi_imx_data *d)
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{
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return d->devtype_data->devtype == IMX35_CSPI;
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}
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static inline int is_imx51_ecspi(struct spi_imx_data *d)
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{
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return d->devtype_data->devtype == IMX51_ECSPI;
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}
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static inline unsigned spi_imx_get_fifosize(struct spi_imx_data *d)
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{
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return is_imx51_ecspi(d) ? 64 : 8;
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}
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#define MXC_SPI_BUF_RX(type) \
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static void spi_imx_buf_rx_##type(struct spi_imx_data *spi_imx) \
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{ \
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unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA); \
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\
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if (spi_imx->rx_buf) { \
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*(type *)spi_imx->rx_buf = val; \
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spi_imx->rx_buf += sizeof(type); \
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} \
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}
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#define MXC_SPI_BUF_TX(type) \
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static void spi_imx_buf_tx_##type(struct spi_imx_data *spi_imx) \
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{ \
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type val = 0; \
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\
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if (spi_imx->tx_buf) { \
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val = *(type *)spi_imx->tx_buf; \
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spi_imx->tx_buf += sizeof(type); \
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} \
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\
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spi_imx->count -= sizeof(type); \
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\
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writel(val, spi_imx->base + MXC_CSPITXDATA); \
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}
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MXC_SPI_BUF_RX(u8)
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MXC_SPI_BUF_TX(u8)
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MXC_SPI_BUF_RX(u16)
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MXC_SPI_BUF_TX(u16)
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MXC_SPI_BUF_RX(u32)
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MXC_SPI_BUF_TX(u32)
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/* First entry is reserved, second entry is valid only if SDHC_SPIEN is set
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* (which is currently not the case in this driver)
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*/
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static int mxc_clkdivs[] = {0, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192,
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256, 384, 512, 768, 1024};
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/* MX21, MX27 */
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static unsigned int spi_imx_clkdiv_1(unsigned int fin,
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unsigned int fspi, unsigned int max)
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{
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int i;
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for (i = 2; i < max; i++)
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if (fspi * mxc_clkdivs[i] >= fin)
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return i;
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return max;
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}
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/* MX1, MX31, MX35, MX51 CSPI */
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static unsigned int spi_imx_clkdiv_2(unsigned int fin,
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unsigned int fspi)
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{
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int i, div = 4;
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for (i = 0; i < 7; i++) {
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if (fspi * div >= fin)
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return i;
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div <<= 1;
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}
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return 7;
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}
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static int spi_imx_bytes_per_word(const int bpw)
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{
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return DIV_ROUND_UP(bpw, BITS_PER_BYTE);
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}
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static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi,
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struct spi_transfer *transfer)
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{
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struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
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unsigned int bpw;
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if (!master->dma_rx)
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return false;
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if (!transfer)
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return false;
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bpw = transfer->bits_per_word;
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if (!bpw)
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bpw = spi->bits_per_word;
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bpw = spi_imx_bytes_per_word(bpw);
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if (bpw != 1 && bpw != 2 && bpw != 4)
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return false;
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if (transfer->len < spi_imx->wml * bpw)
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return false;
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if (transfer->len % (spi_imx->wml * bpw))
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return false;
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return true;
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}
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#define MX51_ECSPI_CTRL 0x08
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#define MX51_ECSPI_CTRL_ENABLE (1 << 0)
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#define MX51_ECSPI_CTRL_XCH (1 << 2)
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#define MX51_ECSPI_CTRL_SMC (1 << 3)
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#define MX51_ECSPI_CTRL_MODE_MASK (0xf << 4)
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#define MX51_ECSPI_CTRL_POSTDIV_OFFSET 8
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#define MX51_ECSPI_CTRL_PREDIV_OFFSET 12
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#define MX51_ECSPI_CTRL_CS(cs) ((cs) << 18)
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#define MX51_ECSPI_CTRL_BL_OFFSET 20
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#define MX51_ECSPI_CONFIG 0x0c
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#define MX51_ECSPI_CONFIG_SCLKPHA(cs) (1 << ((cs) + 0))
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#define MX51_ECSPI_CONFIG_SCLKPOL(cs) (1 << ((cs) + 4))
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#define MX51_ECSPI_CONFIG_SBBCTRL(cs) (1 << ((cs) + 8))
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#define MX51_ECSPI_CONFIG_SSBPOL(cs) (1 << ((cs) + 12))
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#define MX51_ECSPI_CONFIG_SCLKCTL(cs) (1 << ((cs) + 20))
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#define MX51_ECSPI_INT 0x10
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#define MX51_ECSPI_INT_TEEN (1 << 0)
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#define MX51_ECSPI_INT_RREN (1 << 3)
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#define MX51_ECSPI_DMA 0x14
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#define MX51_ECSPI_DMA_TX_WML(wml) ((wml) & 0x3f)
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#define MX51_ECSPI_DMA_RX_WML(wml) (((wml) & 0x3f) << 16)
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#define MX51_ECSPI_DMA_RXT_WML(wml) (((wml) & 0x3f) << 24)
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#define MX51_ECSPI_DMA_TEDEN (1 << 7)
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#define MX51_ECSPI_DMA_RXDEN (1 << 23)
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#define MX51_ECSPI_DMA_RXTDEN (1 << 31)
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#define MX51_ECSPI_STAT 0x18
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#define MX51_ECSPI_STAT_RR (1 << 3)
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#define MX51_ECSPI_TESTREG 0x20
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#define MX51_ECSPI_TESTREG_LBC BIT(31)
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/* MX51 eCSPI */
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static unsigned int mx51_ecspi_clkdiv(struct spi_imx_data *spi_imx,
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unsigned int fspi, unsigned int *fres)
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{
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/*
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* there are two 4-bit dividers, the pre-divider divides by
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* $pre, the post-divider by 2^$post
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*/
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unsigned int pre, post;
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unsigned int fin = spi_imx->spi_clk;
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if (unlikely(fspi > fin))
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return 0;
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post = fls(fin) - fls(fspi);
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if (fin > fspi << post)
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post++;
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/* now we have: (fin <= fspi << post) with post being minimal */
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post = max(4U, post) - 4;
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if (unlikely(post > 0xf)) {
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dev_err(spi_imx->dev, "cannot set clock freq: %u (base freq: %u)\n",
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fspi, fin);
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return 0xff;
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}
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pre = DIV_ROUND_UP(fin, fspi << post) - 1;
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dev_dbg(spi_imx->dev, "%s: fin: %u, fspi: %u, post: %u, pre: %u\n",
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__func__, fin, fspi, post, pre);
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/* Resulting frequency for the SCLK line. */
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*fres = (fin / (pre + 1)) >> post;
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return (pre << MX51_ECSPI_CTRL_PREDIV_OFFSET) |
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(post << MX51_ECSPI_CTRL_POSTDIV_OFFSET);
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}
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static void mx51_ecspi_intctrl(struct spi_imx_data *spi_imx, int enable)
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{
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unsigned val = 0;
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if (enable & MXC_INT_TE)
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val |= MX51_ECSPI_INT_TEEN;
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if (enable & MXC_INT_RR)
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val |= MX51_ECSPI_INT_RREN;
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writel(val, spi_imx->base + MX51_ECSPI_INT);
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}
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static void mx51_ecspi_trigger(struct spi_imx_data *spi_imx)
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{
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u32 reg;
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reg = readl(spi_imx->base + MX51_ECSPI_CTRL);
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reg |= MX51_ECSPI_CTRL_XCH;
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writel(reg, spi_imx->base + MX51_ECSPI_CTRL);
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}
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static int mx51_ecspi_config(struct spi_device *spi,
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struct spi_imx_config *config)
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{
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struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
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u32 ctrl = MX51_ECSPI_CTRL_ENABLE;
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u32 clk = config->speed_hz, delay, reg;
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u32 cfg = readl(spi_imx->base + MX51_ECSPI_CONFIG);
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/*
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* The hardware seems to have a race condition when changing modes. The
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* current assumption is that the selection of the channel arrives
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* earlier in the hardware than the mode bits when they are written at
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* the same time.
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* So set master mode for all channels as we do not support slave mode.
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*/
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ctrl |= MX51_ECSPI_CTRL_MODE_MASK;
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/* set clock speed */
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ctrl |= mx51_ecspi_clkdiv(spi_imx, config->speed_hz, &clk);
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spi_imx->spi_bus_clk = clk;
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/* set chip select to use */
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ctrl |= MX51_ECSPI_CTRL_CS(spi->chip_select);
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ctrl |= (config->bpw - 1) << MX51_ECSPI_CTRL_BL_OFFSET;
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cfg |= MX51_ECSPI_CONFIG_SBBCTRL(spi->chip_select);
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if (spi->mode & SPI_CPHA)
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cfg |= MX51_ECSPI_CONFIG_SCLKPHA(spi->chip_select);
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else
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cfg &= ~MX51_ECSPI_CONFIG_SCLKPHA(spi->chip_select);
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if (spi->mode & SPI_CPOL) {
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cfg |= MX51_ECSPI_CONFIG_SCLKPOL(spi->chip_select);
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cfg |= MX51_ECSPI_CONFIG_SCLKCTL(spi->chip_select);
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} else {
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cfg &= ~MX51_ECSPI_CONFIG_SCLKPOL(spi->chip_select);
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cfg &= ~MX51_ECSPI_CONFIG_SCLKCTL(spi->chip_select);
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}
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if (spi->mode & SPI_CS_HIGH)
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cfg |= MX51_ECSPI_CONFIG_SSBPOL(spi->chip_select);
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else
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cfg &= ~MX51_ECSPI_CONFIG_SSBPOL(spi->chip_select);
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if (spi_imx->usedma)
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ctrl |= MX51_ECSPI_CTRL_SMC;
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/* CTRL register always go first to bring out controller from reset */
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writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
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|
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reg = readl(spi_imx->base + MX51_ECSPI_TESTREG);
|
|
if (spi->mode & SPI_LOOP)
|
|
reg |= MX51_ECSPI_TESTREG_LBC;
|
|
else
|
|
reg &= ~MX51_ECSPI_TESTREG_LBC;
|
|
writel(reg, spi_imx->base + MX51_ECSPI_TESTREG);
|
|
|
|
writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG);
|
|
|
|
/*
|
|
* Wait until the changes in the configuration register CONFIGREG
|
|
* propagate into the hardware. It takes exactly one tick of the
|
|
* SCLK clock, but we will wait two SCLK clock just to be sure. The
|
|
* effect of the delay it takes for the hardware to apply changes
|
|
* is noticable if the SCLK clock run very slow. In such a case, if
|
|
* the polarity of SCLK should be inverted, the GPIO ChipSelect might
|
|
* be asserted before the SCLK polarity changes, which would disrupt
|
|
* the SPI communication as the device on the other end would consider
|
|
* the change of SCLK polarity as a clock tick already.
|
|
*/
|
|
delay = (2 * 1000000) / clk;
|
|
if (likely(delay < 10)) /* SCLK is faster than 100 kHz */
|
|
udelay(delay);
|
|
else /* SCLK is _very_ slow */
|
|
usleep_range(delay, delay + 10);
|
|
|
|
/*
|
|
* Configure the DMA register: setup the watermark
|
|
* and enable DMA request.
|
|
*/
|
|
|
|
writel(MX51_ECSPI_DMA_RX_WML(spi_imx->wml) |
|
|
MX51_ECSPI_DMA_TX_WML(spi_imx->wml) |
|
|
MX51_ECSPI_DMA_RXT_WML(spi_imx->wml) |
|
|
MX51_ECSPI_DMA_TEDEN | MX51_ECSPI_DMA_RXDEN |
|
|
MX51_ECSPI_DMA_RXTDEN, spi_imx->base + MX51_ECSPI_DMA);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mx51_ecspi_rx_available(struct spi_imx_data *spi_imx)
|
|
{
|
|
return readl(spi_imx->base + MX51_ECSPI_STAT) & MX51_ECSPI_STAT_RR;
|
|
}
|
|
|
|
static void mx51_ecspi_reset(struct spi_imx_data *spi_imx)
|
|
{
|
|
/* drain receive buffer */
|
|
while (mx51_ecspi_rx_available(spi_imx))
|
|
readl(spi_imx->base + MXC_CSPIRXDATA);
|
|
}
|
|
|
|
#define MX31_INTREG_TEEN (1 << 0)
|
|
#define MX31_INTREG_RREN (1 << 3)
|
|
|
|
#define MX31_CSPICTRL_ENABLE (1 << 0)
|
|
#define MX31_CSPICTRL_MASTER (1 << 1)
|
|
#define MX31_CSPICTRL_XCH (1 << 2)
|
|
#define MX31_CSPICTRL_POL (1 << 4)
|
|
#define MX31_CSPICTRL_PHA (1 << 5)
|
|
#define MX31_CSPICTRL_SSCTL (1 << 6)
|
|
#define MX31_CSPICTRL_SSPOL (1 << 7)
|
|
#define MX31_CSPICTRL_BC_SHIFT 8
|
|
#define MX35_CSPICTRL_BL_SHIFT 20
|
|
#define MX31_CSPICTRL_CS_SHIFT 24
|
|
#define MX35_CSPICTRL_CS_SHIFT 12
|
|
#define MX31_CSPICTRL_DR_SHIFT 16
|
|
|
|
#define MX31_CSPISTATUS 0x14
|
|
#define MX31_STATUS_RR (1 << 3)
|
|
|
|
/* These functions also work for the i.MX35, but be aware that
|
|
* the i.MX35 has a slightly different register layout for bits
|
|
* we do not use here.
|
|
*/
|
|
static void mx31_intctrl(struct spi_imx_data *spi_imx, int enable)
|
|
{
|
|
unsigned int val = 0;
|
|
|
|
if (enable & MXC_INT_TE)
|
|
val |= MX31_INTREG_TEEN;
|
|
if (enable & MXC_INT_RR)
|
|
val |= MX31_INTREG_RREN;
|
|
|
|
writel(val, spi_imx->base + MXC_CSPIINT);
|
|
}
|
|
|
|
static void mx31_trigger(struct spi_imx_data *spi_imx)
|
|
{
|
|
unsigned int reg;
|
|
|
|
reg = readl(spi_imx->base + MXC_CSPICTRL);
|
|
reg |= MX31_CSPICTRL_XCH;
|
|
writel(reg, spi_imx->base + MXC_CSPICTRL);
|
|
}
|
|
|
|
static int mx31_config(struct spi_device *spi, struct spi_imx_config *config)
|
|
{
|
|
struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
|
|
unsigned int reg = MX31_CSPICTRL_ENABLE | MX31_CSPICTRL_MASTER;
|
|
|
|
reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz) <<
|
|
MX31_CSPICTRL_DR_SHIFT;
|
|
|
|
if (is_imx35_cspi(spi_imx)) {
|
|
reg |= (config->bpw - 1) << MX35_CSPICTRL_BL_SHIFT;
|
|
reg |= MX31_CSPICTRL_SSCTL;
|
|
} else {
|
|
reg |= (config->bpw - 1) << MX31_CSPICTRL_BC_SHIFT;
|
|
}
|
|
|
|
if (spi->mode & SPI_CPHA)
|
|
reg |= MX31_CSPICTRL_PHA;
|
|
if (spi->mode & SPI_CPOL)
|
|
reg |= MX31_CSPICTRL_POL;
|
|
if (spi->mode & SPI_CS_HIGH)
|
|
reg |= MX31_CSPICTRL_SSPOL;
|
|
if (spi->cs_gpio < 0)
|
|
reg |= (spi->cs_gpio + 32) <<
|
|
(is_imx35_cspi(spi_imx) ? MX35_CSPICTRL_CS_SHIFT :
|
|
MX31_CSPICTRL_CS_SHIFT);
|
|
|
|
writel(reg, spi_imx->base + MXC_CSPICTRL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mx31_rx_available(struct spi_imx_data *spi_imx)
|
|
{
|
|
return readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR;
|
|
}
|
|
|
|
static void mx31_reset(struct spi_imx_data *spi_imx)
|
|
{
|
|
/* drain receive buffer */
|
|
while (readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR)
|
|
readl(spi_imx->base + MXC_CSPIRXDATA);
|
|
}
|
|
|
|
#define MX21_INTREG_RR (1 << 4)
|
|
#define MX21_INTREG_TEEN (1 << 9)
|
|
#define MX21_INTREG_RREN (1 << 13)
|
|
|
|
#define MX21_CSPICTRL_POL (1 << 5)
|
|
#define MX21_CSPICTRL_PHA (1 << 6)
|
|
#define MX21_CSPICTRL_SSPOL (1 << 8)
|
|
#define MX21_CSPICTRL_XCH (1 << 9)
|
|
#define MX21_CSPICTRL_ENABLE (1 << 10)
|
|
#define MX21_CSPICTRL_MASTER (1 << 11)
|
|
#define MX21_CSPICTRL_DR_SHIFT 14
|
|
#define MX21_CSPICTRL_CS_SHIFT 19
|
|
|
|
static void mx21_intctrl(struct spi_imx_data *spi_imx, int enable)
|
|
{
|
|
unsigned int val = 0;
|
|
|
|
if (enable & MXC_INT_TE)
|
|
val |= MX21_INTREG_TEEN;
|
|
if (enable & MXC_INT_RR)
|
|
val |= MX21_INTREG_RREN;
|
|
|
|
writel(val, spi_imx->base + MXC_CSPIINT);
|
|
}
|
|
|
|
static void mx21_trigger(struct spi_imx_data *spi_imx)
|
|
{
|
|
unsigned int reg;
|
|
|
|
reg = readl(spi_imx->base + MXC_CSPICTRL);
|
|
reg |= MX21_CSPICTRL_XCH;
|
|
writel(reg, spi_imx->base + MXC_CSPICTRL);
|
|
}
|
|
|
|
static int mx21_config(struct spi_device *spi, struct spi_imx_config *config)
|
|
{
|
|
struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
|
|
unsigned int reg = MX21_CSPICTRL_ENABLE | MX21_CSPICTRL_MASTER;
|
|
unsigned int max = is_imx27_cspi(spi_imx) ? 16 : 18;
|
|
|
|
reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, config->speed_hz, max) <<
|
|
MX21_CSPICTRL_DR_SHIFT;
|
|
reg |= config->bpw - 1;
|
|
|
|
if (spi->mode & SPI_CPHA)
|
|
reg |= MX21_CSPICTRL_PHA;
|
|
if (spi->mode & SPI_CPOL)
|
|
reg |= MX21_CSPICTRL_POL;
|
|
if (spi->mode & SPI_CS_HIGH)
|
|
reg |= MX21_CSPICTRL_SSPOL;
|
|
if (spi->cs_gpio < 0)
|
|
reg |= (spi->cs_gpio + 32) << MX21_CSPICTRL_CS_SHIFT;
|
|
|
|
writel(reg, spi_imx->base + MXC_CSPICTRL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mx21_rx_available(struct spi_imx_data *spi_imx)
|
|
{
|
|
return readl(spi_imx->base + MXC_CSPIINT) & MX21_INTREG_RR;
|
|
}
|
|
|
|
static void mx21_reset(struct spi_imx_data *spi_imx)
|
|
{
|
|
writel(1, spi_imx->base + MXC_RESET);
|
|
}
|
|
|
|
#define MX1_INTREG_RR (1 << 3)
|
|
#define MX1_INTREG_TEEN (1 << 8)
|
|
#define MX1_INTREG_RREN (1 << 11)
|
|
|
|
#define MX1_CSPICTRL_POL (1 << 4)
|
|
#define MX1_CSPICTRL_PHA (1 << 5)
|
|
#define MX1_CSPICTRL_XCH (1 << 8)
|
|
#define MX1_CSPICTRL_ENABLE (1 << 9)
|
|
#define MX1_CSPICTRL_MASTER (1 << 10)
|
|
#define MX1_CSPICTRL_DR_SHIFT 13
|
|
|
|
static void mx1_intctrl(struct spi_imx_data *spi_imx, int enable)
|
|
{
|
|
unsigned int val = 0;
|
|
|
|
if (enable & MXC_INT_TE)
|
|
val |= MX1_INTREG_TEEN;
|
|
if (enable & MXC_INT_RR)
|
|
val |= MX1_INTREG_RREN;
|
|
|
|
writel(val, spi_imx->base + MXC_CSPIINT);
|
|
}
|
|
|
|
static void mx1_trigger(struct spi_imx_data *spi_imx)
|
|
{
|
|
unsigned int reg;
|
|
|
|
reg = readl(spi_imx->base + MXC_CSPICTRL);
|
|
reg |= MX1_CSPICTRL_XCH;
|
|
writel(reg, spi_imx->base + MXC_CSPICTRL);
|
|
}
|
|
|
|
static int mx1_config(struct spi_device *spi, struct spi_imx_config *config)
|
|
{
|
|
struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
|
|
unsigned int reg = MX1_CSPICTRL_ENABLE | MX1_CSPICTRL_MASTER;
|
|
|
|
reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz) <<
|
|
MX1_CSPICTRL_DR_SHIFT;
|
|
reg |= config->bpw - 1;
|
|
|
|
if (spi->mode & SPI_CPHA)
|
|
reg |= MX1_CSPICTRL_PHA;
|
|
if (spi->mode & SPI_CPOL)
|
|
reg |= MX1_CSPICTRL_POL;
|
|
|
|
writel(reg, spi_imx->base + MXC_CSPICTRL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mx1_rx_available(struct spi_imx_data *spi_imx)
|
|
{
|
|
return readl(spi_imx->base + MXC_CSPIINT) & MX1_INTREG_RR;
|
|
}
|
|
|
|
static void mx1_reset(struct spi_imx_data *spi_imx)
|
|
{
|
|
writel(1, spi_imx->base + MXC_RESET);
|
|
}
|
|
|
|
static struct spi_imx_devtype_data imx1_cspi_devtype_data = {
|
|
.intctrl = mx1_intctrl,
|
|
.config = mx1_config,
|
|
.trigger = mx1_trigger,
|
|
.rx_available = mx1_rx_available,
|
|
.reset = mx1_reset,
|
|
.devtype = IMX1_CSPI,
|
|
};
|
|
|
|
static struct spi_imx_devtype_data imx21_cspi_devtype_data = {
|
|
.intctrl = mx21_intctrl,
|
|
.config = mx21_config,
|
|
.trigger = mx21_trigger,
|
|
.rx_available = mx21_rx_available,
|
|
.reset = mx21_reset,
|
|
.devtype = IMX21_CSPI,
|
|
};
|
|
|
|
static struct spi_imx_devtype_data imx27_cspi_devtype_data = {
|
|
/* i.mx27 cspi shares the functions with i.mx21 one */
|
|
.intctrl = mx21_intctrl,
|
|
.config = mx21_config,
|
|
.trigger = mx21_trigger,
|
|
.rx_available = mx21_rx_available,
|
|
.reset = mx21_reset,
|
|
.devtype = IMX27_CSPI,
|
|
};
|
|
|
|
static struct spi_imx_devtype_data imx31_cspi_devtype_data = {
|
|
.intctrl = mx31_intctrl,
|
|
.config = mx31_config,
|
|
.trigger = mx31_trigger,
|
|
.rx_available = mx31_rx_available,
|
|
.reset = mx31_reset,
|
|
.devtype = IMX31_CSPI,
|
|
};
|
|
|
|
static struct spi_imx_devtype_data imx35_cspi_devtype_data = {
|
|
/* i.mx35 and later cspi shares the functions with i.mx31 one */
|
|
.intctrl = mx31_intctrl,
|
|
.config = mx31_config,
|
|
.trigger = mx31_trigger,
|
|
.rx_available = mx31_rx_available,
|
|
.reset = mx31_reset,
|
|
.devtype = IMX35_CSPI,
|
|
};
|
|
|
|
static struct spi_imx_devtype_data imx51_ecspi_devtype_data = {
|
|
.intctrl = mx51_ecspi_intctrl,
|
|
.config = mx51_ecspi_config,
|
|
.trigger = mx51_ecspi_trigger,
|
|
.rx_available = mx51_ecspi_rx_available,
|
|
.reset = mx51_ecspi_reset,
|
|
.devtype = IMX51_ECSPI,
|
|
};
|
|
|
|
static const struct platform_device_id spi_imx_devtype[] = {
|
|
{
|
|
.name = "imx1-cspi",
|
|
.driver_data = (kernel_ulong_t) &imx1_cspi_devtype_data,
|
|
}, {
|
|
.name = "imx21-cspi",
|
|
.driver_data = (kernel_ulong_t) &imx21_cspi_devtype_data,
|
|
}, {
|
|
.name = "imx27-cspi",
|
|
.driver_data = (kernel_ulong_t) &imx27_cspi_devtype_data,
|
|
}, {
|
|
.name = "imx31-cspi",
|
|
.driver_data = (kernel_ulong_t) &imx31_cspi_devtype_data,
|
|
}, {
|
|
.name = "imx35-cspi",
|
|
.driver_data = (kernel_ulong_t) &imx35_cspi_devtype_data,
|
|
}, {
|
|
.name = "imx51-ecspi",
|
|
.driver_data = (kernel_ulong_t) &imx51_ecspi_devtype_data,
|
|
}, {
|
|
/* sentinel */
|
|
}
|
|
};
|
|
|
|
static const struct of_device_id spi_imx_dt_ids[] = {
|
|
{ .compatible = "fsl,imx1-cspi", .data = &imx1_cspi_devtype_data, },
|
|
{ .compatible = "fsl,imx21-cspi", .data = &imx21_cspi_devtype_data, },
|
|
{ .compatible = "fsl,imx27-cspi", .data = &imx27_cspi_devtype_data, },
|
|
{ .compatible = "fsl,imx31-cspi", .data = &imx31_cspi_devtype_data, },
|
|
{ .compatible = "fsl,imx35-cspi", .data = &imx35_cspi_devtype_data, },
|
|
{ .compatible = "fsl,imx51-ecspi", .data = &imx51_ecspi_devtype_data, },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, spi_imx_dt_ids);
|
|
|
|
static void spi_imx_chipselect(struct spi_device *spi, int is_active)
|
|
{
|
|
int active = is_active != BITBANG_CS_INACTIVE;
|
|
int dev_is_lowactive = !(spi->mode & SPI_CS_HIGH);
|
|
|
|
if (!gpio_is_valid(spi->cs_gpio))
|
|
return;
|
|
|
|
gpio_set_value(spi->cs_gpio, dev_is_lowactive ^ active);
|
|
}
|
|
|
|
static void spi_imx_push(struct spi_imx_data *spi_imx)
|
|
{
|
|
while (spi_imx->txfifo < spi_imx_get_fifosize(spi_imx)) {
|
|
if (!spi_imx->count)
|
|
break;
|
|
spi_imx->tx(spi_imx);
|
|
spi_imx->txfifo++;
|
|
}
|
|
|
|
spi_imx->devtype_data->trigger(spi_imx);
|
|
}
|
|
|
|
static irqreturn_t spi_imx_isr(int irq, void *dev_id)
|
|
{
|
|
struct spi_imx_data *spi_imx = dev_id;
|
|
|
|
while (spi_imx->devtype_data->rx_available(spi_imx)) {
|
|
spi_imx->rx(spi_imx);
|
|
spi_imx->txfifo--;
|
|
}
|
|
|
|
if (spi_imx->count) {
|
|
spi_imx_push(spi_imx);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
if (spi_imx->txfifo) {
|
|
/* No data left to push, but still waiting for rx data,
|
|
* enable receive data available interrupt.
|
|
*/
|
|
spi_imx->devtype_data->intctrl(
|
|
spi_imx, MXC_INT_RR);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
spi_imx->devtype_data->intctrl(spi_imx, 0);
|
|
complete(&spi_imx->xfer_done);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int spi_imx_dma_configure(struct spi_master *master,
|
|
int bytes_per_word)
|
|
{
|
|
int ret;
|
|
enum dma_slave_buswidth buswidth;
|
|
struct dma_slave_config rx = {}, tx = {};
|
|
struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
|
|
|
|
if (bytes_per_word == spi_imx->bytes_per_word)
|
|
/* Same as last time */
|
|
return 0;
|
|
|
|
switch (bytes_per_word) {
|
|
case 4:
|
|
buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES;
|
|
break;
|
|
case 2:
|
|
buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES;
|
|
break;
|
|
case 1:
|
|
buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
tx.direction = DMA_MEM_TO_DEV;
|
|
tx.dst_addr = spi_imx->base_phys + MXC_CSPITXDATA;
|
|
tx.dst_addr_width = buswidth;
|
|
tx.dst_maxburst = spi_imx->wml;
|
|
ret = dmaengine_slave_config(master->dma_tx, &tx);
|
|
if (ret) {
|
|
dev_err(spi_imx->dev, "TX dma configuration failed with %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
rx.direction = DMA_DEV_TO_MEM;
|
|
rx.src_addr = spi_imx->base_phys + MXC_CSPIRXDATA;
|
|
rx.src_addr_width = buswidth;
|
|
rx.src_maxburst = spi_imx->wml;
|
|
ret = dmaengine_slave_config(master->dma_rx, &rx);
|
|
if (ret) {
|
|
dev_err(spi_imx->dev, "RX dma configuration failed with %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
spi_imx->bytes_per_word = bytes_per_word;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int spi_imx_setupxfer(struct spi_device *spi,
|
|
struct spi_transfer *t)
|
|
{
|
|
struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
|
|
struct spi_imx_config config;
|
|
int ret;
|
|
|
|
config.bpw = t ? t->bits_per_word : spi->bits_per_word;
|
|
config.speed_hz = t ? t->speed_hz : spi->max_speed_hz;
|
|
|
|
if (!config.speed_hz)
|
|
config.speed_hz = spi->max_speed_hz;
|
|
if (!config.bpw)
|
|
config.bpw = spi->bits_per_word;
|
|
|
|
/* Initialize the functions for transfer */
|
|
if (config.bpw <= 8) {
|
|
spi_imx->rx = spi_imx_buf_rx_u8;
|
|
spi_imx->tx = spi_imx_buf_tx_u8;
|
|
} else if (config.bpw <= 16) {
|
|
spi_imx->rx = spi_imx_buf_rx_u16;
|
|
spi_imx->tx = spi_imx_buf_tx_u16;
|
|
} else {
|
|
spi_imx->rx = spi_imx_buf_rx_u32;
|
|
spi_imx->tx = spi_imx_buf_tx_u32;
|
|
}
|
|
|
|
if (spi_imx_can_dma(spi_imx->bitbang.master, spi, t))
|
|
spi_imx->usedma = 1;
|
|
else
|
|
spi_imx->usedma = 0;
|
|
|
|
if (spi_imx->usedma) {
|
|
ret = spi_imx_dma_configure(spi->master,
|
|
spi_imx_bytes_per_word(config.bpw));
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
spi_imx->devtype_data->config(spi, &config);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void spi_imx_sdma_exit(struct spi_imx_data *spi_imx)
|
|
{
|
|
struct spi_master *master = spi_imx->bitbang.master;
|
|
|
|
if (master->dma_rx) {
|
|
dma_release_channel(master->dma_rx);
|
|
master->dma_rx = NULL;
|
|
}
|
|
|
|
if (master->dma_tx) {
|
|
dma_release_channel(master->dma_tx);
|
|
master->dma_tx = NULL;
|
|
}
|
|
}
|
|
|
|
static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx,
|
|
struct spi_master *master)
|
|
{
|
|
int ret;
|
|
|
|
/* use pio mode for i.mx6dl chip TKT238285 */
|
|
if (of_machine_is_compatible("fsl,imx6dl"))
|
|
return 0;
|
|
|
|
spi_imx->wml = spi_imx_get_fifosize(spi_imx) / 2;
|
|
|
|
/* Prepare for TX DMA: */
|
|
master->dma_tx = dma_request_slave_channel_reason(dev, "tx");
|
|
if (IS_ERR(master->dma_tx)) {
|
|
ret = PTR_ERR(master->dma_tx);
|
|
dev_dbg(dev, "can't get the TX DMA channel, error %d!\n", ret);
|
|
master->dma_tx = NULL;
|
|
goto err;
|
|
}
|
|
|
|
/* Prepare for RX : */
|
|
master->dma_rx = dma_request_slave_channel_reason(dev, "rx");
|
|
if (IS_ERR(master->dma_rx)) {
|
|
ret = PTR_ERR(master->dma_rx);
|
|
dev_dbg(dev, "can't get the RX DMA channel, error %d\n", ret);
|
|
master->dma_rx = NULL;
|
|
goto err;
|
|
}
|
|
|
|
spi_imx_dma_configure(master, 1);
|
|
|
|
init_completion(&spi_imx->dma_rx_completion);
|
|
init_completion(&spi_imx->dma_tx_completion);
|
|
master->can_dma = spi_imx_can_dma;
|
|
master->max_dma_len = MAX_SDMA_BD_BYTES;
|
|
spi_imx->bitbang.master->flags = SPI_MASTER_MUST_RX |
|
|
SPI_MASTER_MUST_TX;
|
|
|
|
return 0;
|
|
err:
|
|
spi_imx_sdma_exit(spi_imx);
|
|
return ret;
|
|
}
|
|
|
|
static void spi_imx_dma_rx_callback(void *cookie)
|
|
{
|
|
struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie;
|
|
|
|
complete(&spi_imx->dma_rx_completion);
|
|
}
|
|
|
|
static void spi_imx_dma_tx_callback(void *cookie)
|
|
{
|
|
struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie;
|
|
|
|
complete(&spi_imx->dma_tx_completion);
|
|
}
|
|
|
|
static int spi_imx_calculate_timeout(struct spi_imx_data *spi_imx, int size)
|
|
{
|
|
unsigned long timeout = 0;
|
|
|
|
/* Time with actual data transfer and CS change delay related to HW */
|
|
timeout = (8 + 4) * size / spi_imx->spi_bus_clk;
|
|
|
|
/* Add extra second for scheduler related activities */
|
|
timeout += 1;
|
|
|
|
/* Double calculated timeout */
|
|
return msecs_to_jiffies(2 * timeout * MSEC_PER_SEC);
|
|
}
|
|
|
|
static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx,
|
|
struct spi_transfer *transfer)
|
|
{
|
|
struct dma_async_tx_descriptor *desc_tx, *desc_rx;
|
|
unsigned long transfer_timeout;
|
|
unsigned long timeout;
|
|
struct spi_master *master = spi_imx->bitbang.master;
|
|
struct sg_table *tx = &transfer->tx_sg, *rx = &transfer->rx_sg;
|
|
|
|
/*
|
|
* The TX DMA setup starts the transfer, so make sure RX is configured
|
|
* before TX.
|
|
*/
|
|
desc_rx = dmaengine_prep_slave_sg(master->dma_rx,
|
|
rx->sgl, rx->nents, DMA_DEV_TO_MEM,
|
|
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
|
|
if (!desc_rx)
|
|
return -EINVAL;
|
|
|
|
desc_rx->callback = spi_imx_dma_rx_callback;
|
|
desc_rx->callback_param = (void *)spi_imx;
|
|
dmaengine_submit(desc_rx);
|
|
reinit_completion(&spi_imx->dma_rx_completion);
|
|
dma_async_issue_pending(master->dma_rx);
|
|
|
|
desc_tx = dmaengine_prep_slave_sg(master->dma_tx,
|
|
tx->sgl, tx->nents, DMA_MEM_TO_DEV,
|
|
DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
|
|
if (!desc_tx) {
|
|
dmaengine_terminate_all(master->dma_tx);
|
|
return -EINVAL;
|
|
}
|
|
|
|
desc_tx->callback = spi_imx_dma_tx_callback;
|
|
desc_tx->callback_param = (void *)spi_imx;
|
|
dmaengine_submit(desc_tx);
|
|
reinit_completion(&spi_imx->dma_tx_completion);
|
|
dma_async_issue_pending(master->dma_tx);
|
|
|
|
transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len);
|
|
|
|
/* Wait SDMA to finish the data transfer.*/
|
|
timeout = wait_for_completion_timeout(&spi_imx->dma_tx_completion,
|
|
transfer_timeout);
|
|
if (!timeout) {
|
|
dev_err(spi_imx->dev, "I/O Error in DMA TX\n");
|
|
dmaengine_terminate_all(master->dma_tx);
|
|
dmaengine_terminate_all(master->dma_rx);
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
timeout = wait_for_completion_timeout(&spi_imx->dma_rx_completion,
|
|
transfer_timeout);
|
|
if (!timeout) {
|
|
dev_err(&master->dev, "I/O Error in DMA RX\n");
|
|
spi_imx->devtype_data->reset(spi_imx);
|
|
dmaengine_terminate_all(master->dma_rx);
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
return transfer->len;
|
|
}
|
|
|
|
static int spi_imx_pio_transfer(struct spi_device *spi,
|
|
struct spi_transfer *transfer)
|
|
{
|
|
struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
|
|
unsigned long transfer_timeout;
|
|
unsigned long timeout;
|
|
|
|
spi_imx->tx_buf = transfer->tx_buf;
|
|
spi_imx->rx_buf = transfer->rx_buf;
|
|
spi_imx->count = transfer->len;
|
|
spi_imx->txfifo = 0;
|
|
|
|
reinit_completion(&spi_imx->xfer_done);
|
|
|
|
spi_imx_push(spi_imx);
|
|
|
|
spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE);
|
|
|
|
transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len);
|
|
|
|
timeout = wait_for_completion_timeout(&spi_imx->xfer_done,
|
|
transfer_timeout);
|
|
if (!timeout) {
|
|
dev_err(&spi->dev, "I/O Error in PIO\n");
|
|
spi_imx->devtype_data->reset(spi_imx);
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
return transfer->len;
|
|
}
|
|
|
|
static int spi_imx_transfer(struct spi_device *spi,
|
|
struct spi_transfer *transfer)
|
|
{
|
|
struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
|
|
|
|
if (spi_imx->usedma)
|
|
return spi_imx_dma_transfer(spi_imx, transfer);
|
|
else
|
|
return spi_imx_pio_transfer(spi, transfer);
|
|
}
|
|
|
|
static int spi_imx_setup(struct spi_device *spi)
|
|
{
|
|
dev_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n", __func__,
|
|
spi->mode, spi->bits_per_word, spi->max_speed_hz);
|
|
|
|
if (gpio_is_valid(spi->cs_gpio))
|
|
gpio_direction_output(spi->cs_gpio,
|
|
spi->mode & SPI_CS_HIGH ? 0 : 1);
|
|
|
|
spi_imx_chipselect(spi, BITBANG_CS_INACTIVE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void spi_imx_cleanup(struct spi_device *spi)
|
|
{
|
|
}
|
|
|
|
static int
|
|
spi_imx_prepare_message(struct spi_master *master, struct spi_message *msg)
|
|
{
|
|
struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
|
|
int ret;
|
|
|
|
ret = clk_enable(spi_imx->clk_per);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = clk_enable(spi_imx->clk_ipg);
|
|
if (ret) {
|
|
clk_disable(spi_imx->clk_per);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
spi_imx_unprepare_message(struct spi_master *master, struct spi_message *msg)
|
|
{
|
|
struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
|
|
|
|
clk_disable(spi_imx->clk_ipg);
|
|
clk_disable(spi_imx->clk_per);
|
|
return 0;
|
|
}
|
|
|
|
static int spi_imx_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *np = pdev->dev.of_node;
|
|
const struct of_device_id *of_id =
|
|
of_match_device(spi_imx_dt_ids, &pdev->dev);
|
|
struct spi_imx_master *mxc_platform_info =
|
|
dev_get_platdata(&pdev->dev);
|
|
struct spi_master *master;
|
|
struct spi_imx_data *spi_imx;
|
|
struct resource *res;
|
|
int i, ret, irq;
|
|
|
|
if (!np && !mxc_platform_info) {
|
|
dev_err(&pdev->dev, "can't get the platform data\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
master = spi_alloc_master(&pdev->dev, sizeof(struct spi_imx_data));
|
|
if (!master)
|
|
return -ENOMEM;
|
|
|
|
platform_set_drvdata(pdev, master);
|
|
|
|
master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32);
|
|
master->bus_num = np ? -1 : pdev->id;
|
|
|
|
spi_imx = spi_master_get_devdata(master);
|
|
spi_imx->bitbang.master = master;
|
|
spi_imx->dev = &pdev->dev;
|
|
|
|
spi_imx->devtype_data = of_id ? of_id->data :
|
|
(struct spi_imx_devtype_data *)pdev->id_entry->driver_data;
|
|
|
|
if (mxc_platform_info) {
|
|
master->num_chipselect = mxc_platform_info->num_chipselect;
|
|
master->cs_gpios = devm_kzalloc(&master->dev,
|
|
sizeof(int) * master->num_chipselect, GFP_KERNEL);
|
|
if (!master->cs_gpios)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < master->num_chipselect; i++)
|
|
master->cs_gpios[i] = mxc_platform_info->chipselect[i];
|
|
}
|
|
|
|
spi_imx->bitbang.chipselect = spi_imx_chipselect;
|
|
spi_imx->bitbang.setup_transfer = spi_imx_setupxfer;
|
|
spi_imx->bitbang.txrx_bufs = spi_imx_transfer;
|
|
spi_imx->bitbang.master->setup = spi_imx_setup;
|
|
spi_imx->bitbang.master->cleanup = spi_imx_cleanup;
|
|
spi_imx->bitbang.master->prepare_message = spi_imx_prepare_message;
|
|
spi_imx->bitbang.master->unprepare_message = spi_imx_unprepare_message;
|
|
spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
|
|
if (is_imx51_ecspi(spi_imx))
|
|
spi_imx->bitbang.master->mode_bits |= SPI_LOOP;
|
|
|
|
init_completion(&spi_imx->xfer_done);
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
spi_imx->base = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(spi_imx->base)) {
|
|
ret = PTR_ERR(spi_imx->base);
|
|
goto out_master_put;
|
|
}
|
|
spi_imx->base_phys = res->start;
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (irq < 0) {
|
|
ret = irq;
|
|
goto out_master_put;
|
|
}
|
|
|
|
ret = devm_request_irq(&pdev->dev, irq, spi_imx_isr, 0,
|
|
dev_name(&pdev->dev), spi_imx);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "can't get irq%d: %d\n", irq, ret);
|
|
goto out_master_put;
|
|
}
|
|
|
|
spi_imx->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
|
|
if (IS_ERR(spi_imx->clk_ipg)) {
|
|
ret = PTR_ERR(spi_imx->clk_ipg);
|
|
goto out_master_put;
|
|
}
|
|
|
|
spi_imx->clk_per = devm_clk_get(&pdev->dev, "per");
|
|
if (IS_ERR(spi_imx->clk_per)) {
|
|
ret = PTR_ERR(spi_imx->clk_per);
|
|
goto out_master_put;
|
|
}
|
|
|
|
ret = clk_prepare_enable(spi_imx->clk_per);
|
|
if (ret)
|
|
goto out_master_put;
|
|
|
|
ret = clk_prepare_enable(spi_imx->clk_ipg);
|
|
if (ret)
|
|
goto out_put_per;
|
|
|
|
spi_imx->spi_clk = clk_get_rate(spi_imx->clk_per);
|
|
/*
|
|
* Only validated on i.mx6 now, can remove the constrain if validated on
|
|
* other chips.
|
|
*/
|
|
if (is_imx51_ecspi(spi_imx)) {
|
|
ret = spi_imx_sdma_init(&pdev->dev, spi_imx, master);
|
|
if (ret == -EPROBE_DEFER)
|
|
goto out_clk_put;
|
|
|
|
if (ret < 0)
|
|
dev_err(&pdev->dev, "dma setup error %d, use pio\n",
|
|
ret);
|
|
}
|
|
|
|
spi_imx->devtype_data->reset(spi_imx);
|
|
|
|
spi_imx->devtype_data->intctrl(spi_imx, 0);
|
|
|
|
master->dev.of_node = pdev->dev.of_node;
|
|
ret = spi_bitbang_start(&spi_imx->bitbang);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "bitbang start failed with %d\n", ret);
|
|
goto out_clk_put;
|
|
}
|
|
|
|
for (i = 0; i < master->num_chipselect; i++) {
|
|
if (!gpio_is_valid(master->cs_gpios[i]))
|
|
continue;
|
|
|
|
ret = devm_gpio_request(&pdev->dev, master->cs_gpios[i],
|
|
DRIVER_NAME);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "Can't get CS GPIO %i\n",
|
|
master->cs_gpios[i]);
|
|
goto out_clk_put;
|
|
}
|
|
}
|
|
|
|
dev_info(&pdev->dev, "probed\n");
|
|
|
|
clk_disable(spi_imx->clk_ipg);
|
|
clk_disable(spi_imx->clk_per);
|
|
return ret;
|
|
|
|
out_clk_put:
|
|
clk_disable_unprepare(spi_imx->clk_ipg);
|
|
out_put_per:
|
|
clk_disable_unprepare(spi_imx->clk_per);
|
|
out_master_put:
|
|
spi_master_put(master);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int spi_imx_remove(struct platform_device *pdev)
|
|
{
|
|
struct spi_master *master = platform_get_drvdata(pdev);
|
|
struct spi_imx_data *spi_imx = spi_master_get_devdata(master);
|
|
|
|
spi_bitbang_stop(&spi_imx->bitbang);
|
|
|
|
writel(0, spi_imx->base + MXC_CSPICTRL);
|
|
clk_unprepare(spi_imx->clk_ipg);
|
|
clk_unprepare(spi_imx->clk_per);
|
|
spi_imx_sdma_exit(spi_imx);
|
|
spi_master_put(master);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver spi_imx_driver = {
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
.of_match_table = spi_imx_dt_ids,
|
|
},
|
|
.id_table = spi_imx_devtype,
|
|
.probe = spi_imx_probe,
|
|
.remove = spi_imx_remove,
|
|
};
|
|
module_platform_driver(spi_imx_driver);
|
|
|
|
MODULE_DESCRIPTION("SPI Master Controller driver");
|
|
MODULE_AUTHOR("Sascha Hauer, Pengutronix");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:" DRIVER_NAME);
|