![Heiner Kallweit](/assets/img/avatar_default.png)
The return value of fsl_espi_probe (currently struct spi_master *) is just used for checking whether an error occurred. Change the return value type to int and simplify the code. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
791 lines
20 KiB
C
791 lines
20 KiB
C
/*
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* Freescale eSPI controller driver.
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*
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* Copyright 2010 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/fsl_devices.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/mm.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_irq.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/spi/spi.h>
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#include <linux/pm_runtime.h>
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#include <sysdev/fsl_soc.h>
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#include "spi-fsl-lib.h"
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/* eSPI Controller registers */
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#define ESPI_SPMODE 0x00 /* eSPI mode register */
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#define ESPI_SPIE 0x04 /* eSPI event register */
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#define ESPI_SPIM 0x08 /* eSPI mask register */
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#define ESPI_SPCOM 0x0c /* eSPI command register */
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#define ESPI_SPITF 0x10 /* eSPI transmit FIFO access register*/
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#define ESPI_SPIRF 0x14 /* eSPI receive FIFO access register*/
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#define ESPI_SPMODE0 0x20 /* eSPI cs0 mode register */
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#define ESPI_SPMODEx(x) (ESPI_SPMODE0 + (x) * 4)
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/* eSPI Controller mode register definitions */
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#define SPMODE_ENABLE BIT(31)
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#define SPMODE_LOOP BIT(30)
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#define SPMODE_TXTHR(x) ((x) << 8)
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#define SPMODE_RXTHR(x) ((x) << 0)
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/* eSPI Controller CS mode register definitions */
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#define CSMODE_CI_INACTIVEHIGH BIT(31)
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#define CSMODE_CP_BEGIN_EDGECLK BIT(30)
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#define CSMODE_REV BIT(29)
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#define CSMODE_DIV16 BIT(28)
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#define CSMODE_PM(x) ((x) << 24)
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#define CSMODE_POL_1 BIT(20)
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#define CSMODE_LEN(x) ((x) << 16)
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#define CSMODE_BEF(x) ((x) << 12)
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#define CSMODE_AFT(x) ((x) << 8)
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#define CSMODE_CG(x) ((x) << 3)
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/* Default mode/csmode for eSPI controller */
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#define SPMODE_INIT_VAL (SPMODE_TXTHR(4) | SPMODE_RXTHR(3))
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#define CSMODE_INIT_VAL (CSMODE_POL_1 | CSMODE_BEF(0) \
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| CSMODE_AFT(0) | CSMODE_CG(1))
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/* SPIE register values */
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#define SPIE_RXCNT(reg) ((reg >> 24) & 0x3F)
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#define SPIE_TXCNT(reg) ((reg >> 16) & 0x3F)
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#define SPIE_TXE BIT(15) /* TX FIFO empty */
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#define SPIE_DON BIT(14) /* TX done */
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#define SPIE_RXT BIT(13) /* RX FIFO threshold */
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#define SPIE_RXF BIT(12) /* RX FIFO full */
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#define SPIE_TXT BIT(11) /* TX FIFO threshold*/
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#define SPIE_RNE BIT(9) /* RX FIFO not empty */
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#define SPIE_TNF BIT(8) /* TX FIFO not full */
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/* SPIM register values */
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#define SPIM_TXE BIT(15) /* TX FIFO empty */
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#define SPIM_DON BIT(14) /* TX done */
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#define SPIM_RXT BIT(13) /* RX FIFO threshold */
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#define SPIM_RXF BIT(12) /* RX FIFO full */
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#define SPIM_TXT BIT(11) /* TX FIFO threshold*/
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#define SPIM_RNE BIT(9) /* RX FIFO not empty */
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#define SPIM_TNF BIT(8) /* TX FIFO not full */
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/* SPCOM register values */
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#define SPCOM_CS(x) ((x) << 30)
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#define SPCOM_DO BIT(28) /* Dual output */
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#define SPCOM_TO BIT(27) /* TX only */
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#define SPCOM_RXSKIP(x) ((x) << 16)
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#define SPCOM_TRANLEN(x) ((x) << 0)
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#define SPCOM_TRANLEN_MAX 0x10000 /* Max transaction length */
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#define AUTOSUSPEND_TIMEOUT 2000
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static inline u32 fsl_espi_read_reg(struct mpc8xxx_spi *mspi, int offset)
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{
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return ioread32be(mspi->reg_base + offset);
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}
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static inline u8 fsl_espi_read_reg8(struct mpc8xxx_spi *mspi, int offset)
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{
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return ioread8(mspi->reg_base + offset);
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}
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static inline void fsl_espi_write_reg(struct mpc8xxx_spi *mspi, int offset,
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u32 val)
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{
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iowrite32be(val, mspi->reg_base + offset);
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}
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static inline void fsl_espi_write_reg8(struct mpc8xxx_spi *mspi, int offset,
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u8 val)
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{
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iowrite8(val, mspi->reg_base + offset);
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}
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static void fsl_espi_copy_to_buf(struct spi_message *m,
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struct mpc8xxx_spi *mspi)
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{
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struct spi_transfer *t;
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u8 *buf = mspi->local_buf;
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list_for_each_entry(t, &m->transfers, transfer_list) {
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if (t->tx_buf)
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memcpy(buf, t->tx_buf, t->len);
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else
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memset(buf, 0, t->len);
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buf += t->len;
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}
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}
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static void fsl_espi_copy_from_buf(struct spi_message *m,
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struct mpc8xxx_spi *mspi)
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{
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struct spi_transfer *t;
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u8 *buf = mspi->local_buf;
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list_for_each_entry(t, &m->transfers, transfer_list) {
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if (t->rx_buf)
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memcpy(t->rx_buf, buf, t->len);
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buf += t->len;
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}
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}
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static int fsl_espi_check_message(struct spi_message *m)
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{
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struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
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struct spi_transfer *t, *first;
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if (m->frame_length > SPCOM_TRANLEN_MAX) {
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dev_err(mspi->dev, "message too long, size is %u bytes\n",
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m->frame_length);
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return -EMSGSIZE;
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}
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first = list_first_entry(&m->transfers, struct spi_transfer,
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transfer_list);
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list_for_each_entry(t, &m->transfers, transfer_list) {
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if (first->bits_per_word != t->bits_per_word ||
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first->speed_hz != t->speed_hz) {
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dev_err(mspi->dev, "bits_per_word/speed_hz should be the same for all transfers\n");
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return -EINVAL;
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}
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}
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return 0;
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}
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static void fsl_espi_change_mode(struct spi_device *spi)
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{
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struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
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struct spi_mpc8xxx_cs *cs = spi->controller_state;
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u32 tmp;
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unsigned long flags;
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/* Turn off IRQs locally to minimize time that SPI is disabled. */
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local_irq_save(flags);
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/* Turn off SPI unit prior changing mode */
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tmp = fsl_espi_read_reg(mspi, ESPI_SPMODE);
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fsl_espi_write_reg(mspi, ESPI_SPMODE, tmp & ~SPMODE_ENABLE);
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fsl_espi_write_reg(mspi, ESPI_SPMODEx(spi->chip_select),
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cs->hw_mode);
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fsl_espi_write_reg(mspi, ESPI_SPMODE, tmp);
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local_irq_restore(flags);
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}
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static u32 fsl_espi_tx_buf_lsb(struct mpc8xxx_spi *mpc8xxx_spi)
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{
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u32 data;
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u16 data_h;
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u16 data_l;
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const u32 *tx = mpc8xxx_spi->tx;
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if (!tx)
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return 0;
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data = *tx++ << mpc8xxx_spi->tx_shift;
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data_l = data & 0xffff;
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data_h = (data >> 16) & 0xffff;
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swab16s(&data_l);
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swab16s(&data_h);
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data = data_h | data_l;
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mpc8xxx_spi->tx = tx;
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return data;
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}
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static void fsl_espi_setup_transfer(struct spi_device *spi,
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struct spi_transfer *t)
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{
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struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
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int bits_per_word = t ? t->bits_per_word : spi->bits_per_word;
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u32 hz = t ? t->speed_hz : spi->max_speed_hz;
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u8 pm;
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struct spi_mpc8xxx_cs *cs = spi->controller_state;
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cs->rx_shift = 0;
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cs->tx_shift = 0;
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cs->get_rx = mpc8xxx_spi_rx_buf_u32;
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cs->get_tx = mpc8xxx_spi_tx_buf_u32;
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if (bits_per_word <= 8) {
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cs->rx_shift = 8 - bits_per_word;
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} else {
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cs->rx_shift = 16 - bits_per_word;
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if (spi->mode & SPI_LSB_FIRST)
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cs->get_tx = fsl_espi_tx_buf_lsb;
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}
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mpc8xxx_spi->rx_shift = cs->rx_shift;
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mpc8xxx_spi->tx_shift = cs->tx_shift;
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mpc8xxx_spi->get_rx = cs->get_rx;
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mpc8xxx_spi->get_tx = cs->get_tx;
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/* mask out bits we are going to set */
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cs->hw_mode &= ~(CSMODE_LEN(0xF) | CSMODE_DIV16 | CSMODE_PM(0xF));
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cs->hw_mode |= CSMODE_LEN(bits_per_word - 1);
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if ((mpc8xxx_spi->spibrg / hz) > 64) {
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cs->hw_mode |= CSMODE_DIV16;
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pm = DIV_ROUND_UP(mpc8xxx_spi->spibrg, hz * 16 * 4);
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WARN_ONCE(pm > 33, "%s: Requested speed is too low: %d Hz. "
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"Will use %d Hz instead.\n", dev_name(&spi->dev),
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hz, mpc8xxx_spi->spibrg / (4 * 16 * (32 + 1)));
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if (pm > 33)
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pm = 33;
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} else {
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pm = DIV_ROUND_UP(mpc8xxx_spi->spibrg, hz * 4);
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}
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if (pm)
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pm--;
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if (pm < 2)
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pm = 2;
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cs->hw_mode |= CSMODE_PM(pm);
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fsl_espi_change_mode(spi);
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}
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static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
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{
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struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
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u32 word;
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int ret;
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mpc8xxx_spi->len = t->len;
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mpc8xxx_spi->count = roundup(t->len, 4) / 4;
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mpc8xxx_spi->tx = t->tx_buf;
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mpc8xxx_spi->rx = t->rx_buf;
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reinit_completion(&mpc8xxx_spi->done);
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/* Set SPCOM[CS] and SPCOM[TRANLEN] field */
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fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPCOM,
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(SPCOM_CS(spi->chip_select) | SPCOM_TRANLEN(t->len - 1)));
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/* enable rx ints */
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fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPIM, SPIM_RNE);
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/* transmit word */
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word = mpc8xxx_spi->get_tx(mpc8xxx_spi);
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fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPITF, word);
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/* Won't hang up forever, SPI bus sometimes got lost interrupts... */
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ret = wait_for_completion_timeout(&mpc8xxx_spi->done, 2 * HZ);
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if (ret == 0)
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dev_err(mpc8xxx_spi->dev,
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"Transaction hanging up (left %d bytes)\n",
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mpc8xxx_spi->count);
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/* disable rx ints */
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fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPIM, 0);
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return mpc8xxx_spi->count > 0 ? -EMSGSIZE : 0;
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}
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static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans)
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{
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struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
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struct spi_device *spi = m->spi;
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int ret;
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fsl_espi_copy_to_buf(m, mspi);
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fsl_espi_setup_transfer(spi, trans);
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ret = fsl_espi_bufs(spi, trans);
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if (trans->delay_usecs)
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udelay(trans->delay_usecs);
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fsl_espi_setup_transfer(spi, NULL);
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if (!ret)
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fsl_espi_copy_from_buf(m, mspi);
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return ret;
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}
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static int fsl_espi_do_one_msg(struct spi_master *master,
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struct spi_message *m)
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{
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struct mpc8xxx_spi *mspi = spi_master_get_devdata(m->spi->master);
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unsigned int delay_usecs = 0;
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struct spi_transfer *t, trans = {};
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int ret;
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ret = fsl_espi_check_message(m);
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if (ret)
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goto out;
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list_for_each_entry(t, &m->transfers, transfer_list) {
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if (t->delay_usecs > delay_usecs)
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delay_usecs = t->delay_usecs;
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}
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t = list_first_entry(&m->transfers, struct spi_transfer,
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transfer_list);
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trans.len = m->frame_length;
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trans.speed_hz = t->speed_hz;
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trans.bits_per_word = t->bits_per_word;
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trans.delay_usecs = delay_usecs;
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trans.tx_buf = mspi->local_buf;
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trans.rx_buf = mspi->local_buf;
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if (trans.len)
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ret = fsl_espi_trans(m, &trans);
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m->actual_length = ret ? 0 : trans.len;
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out:
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if (m->status == -EINPROGRESS)
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m->status = ret;
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spi_finalize_current_message(master);
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return ret;
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}
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static int fsl_espi_setup(struct spi_device *spi)
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{
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struct mpc8xxx_spi *mpc8xxx_spi;
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u32 loop_mode;
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struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi);
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if (!spi->max_speed_hz)
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return -EINVAL;
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if (!cs) {
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cs = kzalloc(sizeof(*cs), GFP_KERNEL);
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if (!cs)
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return -ENOMEM;
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spi_set_ctldata(spi, cs);
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}
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mpc8xxx_spi = spi_master_get_devdata(spi->master);
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pm_runtime_get_sync(mpc8xxx_spi->dev);
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cs->hw_mode = fsl_espi_read_reg(mpc8xxx_spi,
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ESPI_SPMODEx(spi->chip_select));
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/* mask out bits we are going to set */
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cs->hw_mode &= ~(CSMODE_CP_BEGIN_EDGECLK | CSMODE_CI_INACTIVEHIGH
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| CSMODE_REV);
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if (spi->mode & SPI_CPHA)
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cs->hw_mode |= CSMODE_CP_BEGIN_EDGECLK;
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if (spi->mode & SPI_CPOL)
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cs->hw_mode |= CSMODE_CI_INACTIVEHIGH;
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if (!(spi->mode & SPI_LSB_FIRST))
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cs->hw_mode |= CSMODE_REV;
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/* Handle the loop mode */
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loop_mode = fsl_espi_read_reg(mpc8xxx_spi, ESPI_SPMODE);
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loop_mode &= ~SPMODE_LOOP;
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if (spi->mode & SPI_LOOP)
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loop_mode |= SPMODE_LOOP;
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fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODE, loop_mode);
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fsl_espi_setup_transfer(spi, NULL);
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pm_runtime_mark_last_busy(mpc8xxx_spi->dev);
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pm_runtime_put_autosuspend(mpc8xxx_spi->dev);
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return 0;
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}
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static void fsl_espi_cleanup(struct spi_device *spi)
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{
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struct spi_mpc8xxx_cs *cs = spi_get_ctldata(spi);
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kfree(cs);
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spi_set_ctldata(spi, NULL);
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}
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static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
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{
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/* We need handle RX first */
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if (events & SPIE_RNE) {
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u32 rx_data, tmp;
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u8 rx_data_8;
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int rx_nr_bytes = 4;
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int ret;
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/* Spin until RX is done */
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if (SPIE_RXCNT(events) < min(4, mspi->len)) {
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ret = spin_event_timeout(
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!(SPIE_RXCNT(events =
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fsl_espi_read_reg(mspi, ESPI_SPIE)) <
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min(4, mspi->len)),
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10000, 0); /* 10 msec */
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if (!ret)
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dev_err(mspi->dev,
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"tired waiting for SPIE_RXCNT\n");
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}
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if (mspi->len >= 4) {
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rx_data = fsl_espi_read_reg(mspi, ESPI_SPIRF);
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} else if (mspi->len <= 0) {
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dev_err(mspi->dev,
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"unexpected RX(SPIE_RNE) interrupt occurred,\n"
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"(local rxlen %d bytes, reg rxlen %d bytes)\n",
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min(4, mspi->len), SPIE_RXCNT(events));
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rx_nr_bytes = 0;
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} else {
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rx_nr_bytes = mspi->len;
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tmp = mspi->len;
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rx_data = 0;
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while (tmp--) {
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rx_data_8 = fsl_espi_read_reg8(mspi,
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ESPI_SPIRF);
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rx_data |= (rx_data_8 << (tmp * 8));
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}
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rx_data <<= (4 - mspi->len) * 8;
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}
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mspi->len -= rx_nr_bytes;
|
|
|
|
if (mspi->rx)
|
|
mspi->get_rx(rx_data, mspi);
|
|
}
|
|
|
|
if (!(events & SPIE_TNF)) {
|
|
int ret;
|
|
|
|
/* spin until TX is done */
|
|
ret = spin_event_timeout(((events = fsl_espi_read_reg(
|
|
mspi, ESPI_SPIE)) & SPIE_TNF), 1000, 0);
|
|
if (!ret) {
|
|
dev_err(mspi->dev, "tired waiting for SPIE_TNF\n");
|
|
complete(&mspi->done);
|
|
return;
|
|
}
|
|
}
|
|
|
|
mspi->count -= 1;
|
|
if (mspi->count) {
|
|
u32 word = mspi->get_tx(mspi);
|
|
|
|
fsl_espi_write_reg(mspi, ESPI_SPITF, word);
|
|
} else {
|
|
complete(&mspi->done);
|
|
}
|
|
}
|
|
|
|
static irqreturn_t fsl_espi_irq(s32 irq, void *context_data)
|
|
{
|
|
struct mpc8xxx_spi *mspi = context_data;
|
|
u32 events;
|
|
|
|
/* Get interrupt events(tx/rx) */
|
|
events = fsl_espi_read_reg(mspi, ESPI_SPIE);
|
|
if (!events)
|
|
return IRQ_NONE;
|
|
|
|
dev_vdbg(mspi->dev, "%s: events %x\n", __func__, events);
|
|
|
|
fsl_espi_cpu_irq(mspi, events);
|
|
|
|
/* Clear the events */
|
|
fsl_espi_write_reg(mspi, ESPI_SPIE, events);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
static int fsl_espi_runtime_suspend(struct device *dev)
|
|
{
|
|
struct spi_master *master = dev_get_drvdata(dev);
|
|
struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
|
|
u32 regval;
|
|
|
|
regval = fsl_espi_read_reg(mpc8xxx_spi, ESPI_SPMODE);
|
|
regval &= ~SPMODE_ENABLE;
|
|
fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODE, regval);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int fsl_espi_runtime_resume(struct device *dev)
|
|
{
|
|
struct spi_master *master = dev_get_drvdata(dev);
|
|
struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
|
|
u32 regval;
|
|
|
|
regval = fsl_espi_read_reg(mpc8xxx_spi, ESPI_SPMODE);
|
|
regval |= SPMODE_ENABLE;
|
|
fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODE, regval);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static size_t fsl_espi_max_message_size(struct spi_device *spi)
|
|
{
|
|
return SPCOM_TRANLEN_MAX;
|
|
}
|
|
|
|
static int fsl_espi_probe(struct device *dev, struct resource *mem,
|
|
unsigned int irq)
|
|
{
|
|
struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
|
|
struct spi_master *master;
|
|
struct mpc8xxx_spi *mpc8xxx_spi;
|
|
struct device_node *nc;
|
|
const __be32 *prop;
|
|
u32 regval, csmode;
|
|
int i, len, ret;
|
|
|
|
master = spi_alloc_master(dev, sizeof(struct mpc8xxx_spi));
|
|
if (!master)
|
|
return -ENOMEM;
|
|
|
|
dev_set_drvdata(dev, master);
|
|
|
|
mpc8xxx_spi_probe(dev, mem, irq);
|
|
|
|
master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16);
|
|
master->setup = fsl_espi_setup;
|
|
master->cleanup = fsl_espi_cleanup;
|
|
master->transfer_one_message = fsl_espi_do_one_msg;
|
|
master->auto_runtime_pm = true;
|
|
master->max_message_size = fsl_espi_max_message_size;
|
|
|
|
mpc8xxx_spi = spi_master_get_devdata(master);
|
|
|
|
mpc8xxx_spi->local_buf =
|
|
devm_kmalloc(dev, SPCOM_TRANLEN_MAX, GFP_KERNEL);
|
|
if (!mpc8xxx_spi->local_buf) {
|
|
ret = -ENOMEM;
|
|
goto err_probe;
|
|
}
|
|
|
|
mpc8xxx_spi->reg_base = devm_ioremap_resource(dev, mem);
|
|
if (IS_ERR(mpc8xxx_spi->reg_base)) {
|
|
ret = PTR_ERR(mpc8xxx_spi->reg_base);
|
|
goto err_probe;
|
|
}
|
|
|
|
/* Register for SPI Interrupt */
|
|
ret = devm_request_irq(dev, mpc8xxx_spi->irq, fsl_espi_irq,
|
|
0, "fsl_espi", mpc8xxx_spi);
|
|
if (ret)
|
|
goto err_probe;
|
|
|
|
if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) {
|
|
mpc8xxx_spi->rx_shift = 16;
|
|
mpc8xxx_spi->tx_shift = 24;
|
|
}
|
|
|
|
/* SPI controller initializations */
|
|
fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODE, 0);
|
|
fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPIM, 0);
|
|
fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPCOM, 0);
|
|
fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPIE, 0xffffffff);
|
|
|
|
/* Init eSPI CS mode register */
|
|
for_each_available_child_of_node(master->dev.of_node, nc) {
|
|
/* get chip select */
|
|
prop = of_get_property(nc, "reg", &len);
|
|
if (!prop || len < sizeof(*prop))
|
|
continue;
|
|
i = be32_to_cpup(prop);
|
|
if (i < 0 || i >= pdata->max_chipselect)
|
|
continue;
|
|
|
|
csmode = CSMODE_INIT_VAL;
|
|
/* check if CSBEF is set in device tree */
|
|
prop = of_get_property(nc, "fsl,csbef", &len);
|
|
if (prop && len >= sizeof(*prop)) {
|
|
csmode &= ~(CSMODE_BEF(0xf));
|
|
csmode |= CSMODE_BEF(be32_to_cpup(prop));
|
|
}
|
|
/* check if CSAFT is set in device tree */
|
|
prop = of_get_property(nc, "fsl,csaft", &len);
|
|
if (prop && len >= sizeof(*prop)) {
|
|
csmode &= ~(CSMODE_AFT(0xf));
|
|
csmode |= CSMODE_AFT(be32_to_cpup(prop));
|
|
}
|
|
fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODEx(i), csmode);
|
|
|
|
dev_info(dev, "cs=%d, init_csmode=0x%x\n", i, csmode);
|
|
}
|
|
|
|
/* Enable SPI interface */
|
|
regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE;
|
|
|
|
fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODE, regval);
|
|
|
|
pm_runtime_set_autosuspend_delay(dev, AUTOSUSPEND_TIMEOUT);
|
|
pm_runtime_use_autosuspend(dev);
|
|
pm_runtime_set_active(dev);
|
|
pm_runtime_enable(dev);
|
|
pm_runtime_get_sync(dev);
|
|
|
|
ret = devm_spi_register_master(dev, master);
|
|
if (ret < 0)
|
|
goto err_pm;
|
|
|
|
dev_info(dev, "at 0x%p (irq = %d)\n", mpc8xxx_spi->reg_base,
|
|
mpc8xxx_spi->irq);
|
|
|
|
pm_runtime_mark_last_busy(dev);
|
|
pm_runtime_put_autosuspend(dev);
|
|
|
|
return 0;
|
|
|
|
err_pm:
|
|
pm_runtime_put_noidle(dev);
|
|
pm_runtime_disable(dev);
|
|
pm_runtime_set_suspended(dev);
|
|
err_probe:
|
|
spi_master_put(master);
|
|
return ret;
|
|
}
|
|
|
|
static int of_fsl_espi_get_chipselects(struct device *dev)
|
|
{
|
|
struct device_node *np = dev->of_node;
|
|
struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
|
|
const u32 *prop;
|
|
int len;
|
|
|
|
prop = of_get_property(np, "fsl,espi-num-chipselects", &len);
|
|
if (!prop || len < sizeof(*prop)) {
|
|
dev_err(dev, "No 'fsl,espi-num-chipselects' property\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
pdata->max_chipselect = *prop;
|
|
pdata->cs_control = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int of_fsl_espi_probe(struct platform_device *ofdev)
|
|
{
|
|
struct device *dev = &ofdev->dev;
|
|
struct device_node *np = ofdev->dev.of_node;
|
|
struct resource mem;
|
|
unsigned int irq;
|
|
int ret;
|
|
|
|
ret = of_mpc8xxx_spi_probe(ofdev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = of_fsl_espi_get_chipselects(dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = of_address_to_resource(np, 0, &mem);
|
|
if (ret)
|
|
return ret;
|
|
|
|
irq = irq_of_parse_and_map(np, 0);
|
|
if (!irq)
|
|
return -EINVAL;
|
|
|
|
return fsl_espi_probe(dev, &mem, irq);
|
|
}
|
|
|
|
static int of_fsl_espi_remove(struct platform_device *dev)
|
|
{
|
|
pm_runtime_disable(&dev->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int of_fsl_espi_suspend(struct device *dev)
|
|
{
|
|
struct spi_master *master = dev_get_drvdata(dev);
|
|
int ret;
|
|
|
|
ret = spi_master_suspend(master);
|
|
if (ret) {
|
|
dev_warn(dev, "cannot suspend master\n");
|
|
return ret;
|
|
}
|
|
|
|
ret = pm_runtime_force_suspend(dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int of_fsl_espi_resume(struct device *dev)
|
|
{
|
|
struct fsl_spi_platform_data *pdata = dev_get_platdata(dev);
|
|
struct spi_master *master = dev_get_drvdata(dev);
|
|
struct mpc8xxx_spi *mpc8xxx_spi;
|
|
u32 regval;
|
|
int i, ret;
|
|
|
|
mpc8xxx_spi = spi_master_get_devdata(master);
|
|
|
|
/* SPI controller initializations */
|
|
fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODE, 0);
|
|
fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPIM, 0);
|
|
fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPCOM, 0);
|
|
fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPIE, 0xffffffff);
|
|
|
|
/* Init eSPI CS mode register */
|
|
for (i = 0; i < pdata->max_chipselect; i++)
|
|
fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODEx(i),
|
|
CSMODE_INIT_VAL);
|
|
|
|
/* Enable SPI interface */
|
|
regval = pdata->initial_spmode | SPMODE_INIT_VAL | SPMODE_ENABLE;
|
|
|
|
fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPMODE, regval);
|
|
|
|
ret = pm_runtime_force_resume(dev);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return spi_master_resume(master);
|
|
}
|
|
#endif /* CONFIG_PM_SLEEP */
|
|
|
|
static const struct dev_pm_ops espi_pm = {
|
|
SET_RUNTIME_PM_OPS(fsl_espi_runtime_suspend,
|
|
fsl_espi_runtime_resume, NULL)
|
|
SET_SYSTEM_SLEEP_PM_OPS(of_fsl_espi_suspend, of_fsl_espi_resume)
|
|
};
|
|
|
|
static const struct of_device_id of_fsl_espi_match[] = {
|
|
{ .compatible = "fsl,mpc8536-espi" },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, of_fsl_espi_match);
|
|
|
|
static struct platform_driver fsl_espi_driver = {
|
|
.driver = {
|
|
.name = "fsl_espi",
|
|
.of_match_table = of_fsl_espi_match,
|
|
.pm = &espi_pm,
|
|
},
|
|
.probe = of_fsl_espi_probe,
|
|
.remove = of_fsl_espi_remove,
|
|
};
|
|
module_platform_driver(fsl_espi_driver);
|
|
|
|
MODULE_AUTHOR("Mingkai Hu");
|
|
MODULE_DESCRIPTION("Enhanced Freescale SPI Driver");
|
|
MODULE_LICENSE("GPL");
|