diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2023-02-20 15:28:57 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2023-02-20 15:28:57 -0800 |
commit | ff0c7e18629b8bd64681313a88ce55e182c9fee6 (patch) | |
tree | 70efa650f6458514e1d7e5e3f72cc8f87fc5cf2c /drivers/spi | |
parent | 5b0ed5964928b0aaf0d644c17c886c7f5ea4bb3f (diff) | |
parent | a1f925bc4fa899b3c0f2dcbc432d572c36e74e71 (diff) | |
download | lwn-ff0c7e18629b8bd64681313a88ce55e182c9fee6.tar.gz lwn-ff0c7e18629b8bd64681313a88ce55e182c9fee6.zip |
Merge tag 'arm-boardfile-remove-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
Pull ARM SoC boardfile updates from Arnd Bergmann
"Unused boardfile removal for 6.3
This is a follow-up to the deprecation of most of the old-style board
files that was merged in linux-6.0, removing them for good.
This branch is almost exclusively dead code removal based on those
annotations. Some device driver removals went through separate
subsystem trees, but the majority is in the same branch, in order to
better handle dependencies between the patches and avoid breaking
bisection.
Unfortunately that leads to merge conflicts against other changes in
the subsystem trees, but they should all be trivial to resolve by
removing the files.
See commit 7d0d3fa7339e ("Merge tag 'arm-boardfiles-6.0' of
git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc") for the
description of which machines were marked unused and are now removed.
The only removals that got postponed are Terastation WXL (mv78xx0) and
Jornada720 (StrongARM1100), which turned out to still have potential
users"
* tag 'arm-boardfile-remove-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (91 commits)
mmc: omap: drop TPS65010 dependency
ARM: pxa: restore mfp-pxa320.h
usb: ohci-omap: avoid unused-variable warning
ARM: debug: remove references in DEBUG_UART_8250_SHIFT to removed configs
ARM: s3c: remove obsolete s3c-cpu-freq header
MAINTAINERS: adjust SAMSUNG SOC CLOCK DRIVERS after s3c24xx support removal
MAINTAINERS: update file entries after arm multi-platform rework and mach-pxa removal
ARM: remove CONFIG_UNUSED_BOARD_FILES
mfd: remove htc-pasic3 driver
w1: remove ds1wm driver
usb: remove ohci-tmio driver
fbdev: remove w100fb driver
fbdev: remove tmiofb driver
mmc: remove tmio_mmc driver
mfd: remove ucb1400 support
mfd: remove toshiba tmio drivers
rtc: remove v3020 driver
power: remove pda_power supply driver
ASoC: pxa: remove unused board support
pcmcia: remove unused pxa/sa1100 drivers
...
Diffstat (limited to 'drivers/spi')
-rw-r--r-- | drivers/spi/Kconfig | 24 | ||||
-rw-r--r-- | drivers/spi/Makefile | 3 | ||||
-rw-r--r-- | drivers/spi/spi-omap-100k.c | 490 | ||||
-rw-r--r-- | drivers/spi/spi-omap-uwire.c | 16 | ||||
-rw-r--r-- | drivers/spi/spi-s3c24xx-regs.h | 41 | ||||
-rw-r--r-- | drivers/spi/spi-s3c24xx.c | 596 |
6 files changed, 1 insertions, 1169 deletions
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 3b1c0878bb85..2aba88a57a77 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -708,12 +708,6 @@ config SPI_TI_QSPI This device supports single, dual and quad read support, while it only supports single write mode. -config SPI_OMAP_100K - tristate "OMAP SPI 100K" - depends on ARCH_OMAP850 || ARCH_OMAP730 || COMPILE_TEST - help - OMAP SPI 100K master controller for omap7xx boards. - config SPI_ORION tristate "Orion SPI master" depends on PLAT_ORION || ARCH_MVEBU || COMPILE_TEST @@ -844,24 +838,6 @@ config SPI_QCOM_GENI This driver can also be built as a module. If so, the module will be called spi-geni-qcom. -config SPI_S3C24XX - tristate "Samsung S3C24XX series SPI" - depends on ARCH_S3C24XX - select SPI_BITBANG - help - SPI driver for Samsung S3C24XX series ARM SoCs - -config SPI_S3C24XX_FIQ - bool "S3C24XX driver with FIQ pseudo-DMA" - depends on SPI_S3C24XX - select FIQ - help - Enable FIQ support for the S3C24XX SPI driver to provide pseudo - DMA by using the fast-interrupt request framework, This allows - the driver to get DMA-like performance when there are either - no free DMA channels, or when doing transfers that required both - TX and RX data paths. - config SPI_S3C64XX tristate "Samsung S3C64XX/Exynos SoC series type SPI" depends on (PLAT_SAMSUNG || ARCH_S5PV210 || ARCH_EXYNOS || COMPILE_TEST) diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index be9ba40ef8d0..12648f75a919 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -91,7 +91,6 @@ obj-$(CONFIG_SPI_OC_TINY) += spi-oc-tiny.o spi-octeon-objs := spi-cavium.o spi-cavium-octeon.o obj-$(CONFIG_SPI_OCTEON) += spi-octeon.o obj-$(CONFIG_SPI_OMAP_UWIRE) += spi-omap-uwire.o -obj-$(CONFIG_SPI_OMAP_100K) += spi-omap-100k.o obj-$(CONFIG_SPI_OMAP24XX) += spi-omap2-mcspi.o obj-$(CONFIG_SPI_TI_QSPI) += spi-ti-qspi.o obj-$(CONFIG_SPI_ORION) += spi-orion.o @@ -112,8 +111,6 @@ obj-$(CONFIG_SPI_RB4XX) += spi-rb4xx.o obj-$(CONFIG_MACH_REALTEK_RTL) += spi-realtek-rtl.o obj-$(CONFIG_SPI_RPCIF) += spi-rpc-if.o obj-$(CONFIG_SPI_RSPI) += spi-rspi.o -obj-$(CONFIG_SPI_S3C24XX) += spi-s3c24xx-hw.o -spi-s3c24xx-hw-y := spi-s3c24xx.o obj-$(CONFIG_SPI_S3C64XX) += spi-s3c64xx.o obj-$(CONFIG_SPI_SC18IS602) += spi-sc18is602.o obj-$(CONFIG_SPI_SH) += spi-sh.o diff --git a/drivers/spi/spi-omap-100k.c b/drivers/spi/spi-omap-100k.c deleted file mode 100644 index 061f7394e5b9..000000000000 --- a/drivers/spi/spi-omap-100k.c +++ /dev/null @@ -1,490 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * OMAP7xx SPI 100k controller driver - * Author: Fabrice Crohas <fcrohas@gmail.com> - * from original omap1_mcspi driver - * - * Copyright (C) 2005, 2006 Nokia Corporation - * Author: Samuel Ortiz <samuel.ortiz@nokia.com> and - * Juha Yrjola <juha.yrjola@nokia.com> - */ -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/module.h> -#include <linux/device.h> -#include <linux/delay.h> -#include <linux/platform_device.h> -#include <linux/pm_runtime.h> -#include <linux/err.h> -#include <linux/clk.h> -#include <linux/io.h> -#include <linux/slab.h> - -#include <linux/spi/spi.h> - -#define OMAP1_SPI100K_MAX_FREQ 48000000 - -#define ICR_SPITAS (OMAP7XX_ICR_BASE + 0x12) - -#define SPI_SETUP1 0x00 -#define SPI_SETUP2 0x02 -#define SPI_CTRL 0x04 -#define SPI_STATUS 0x06 -#define SPI_TX_LSB 0x08 -#define SPI_TX_MSB 0x0a -#define SPI_RX_LSB 0x0c -#define SPI_RX_MSB 0x0e - -#define SPI_SETUP1_INT_READ_ENABLE (1UL << 5) -#define SPI_SETUP1_INT_WRITE_ENABLE (1UL << 4) -#define SPI_SETUP1_CLOCK_DIVISOR(x) ((x) << 1) -#define SPI_SETUP1_CLOCK_ENABLE (1UL << 0) - -#define SPI_SETUP2_ACTIVE_EDGE_FALLING (0UL << 0) -#define SPI_SETUP2_ACTIVE_EDGE_RISING (1UL << 0) -#define SPI_SETUP2_NEGATIVE_LEVEL (0UL << 5) -#define SPI_SETUP2_POSITIVE_LEVEL (1UL << 5) -#define SPI_SETUP2_LEVEL_TRIGGER (0UL << 10) -#define SPI_SETUP2_EDGE_TRIGGER (1UL << 10) - -#define SPI_CTRL_SEN(x) ((x) << 7) -#define SPI_CTRL_WORD_SIZE(x) (((x) - 1) << 2) -#define SPI_CTRL_WR (1UL << 1) -#define SPI_CTRL_RD (1UL << 0) - -#define SPI_STATUS_WE (1UL << 1) -#define SPI_STATUS_RD (1UL << 0) - -/* use PIO for small transfers, avoiding DMA setup/teardown overhead and - * cache operations; better heuristics consider wordsize and bitrate. - */ -#define DMA_MIN_BYTES 8 - -#define SPI_RUNNING 0 -#define SPI_SHUTDOWN 1 - -struct omap1_spi100k { - struct clk *ick; - struct clk *fck; - - /* Virtual base address of the controller */ - void __iomem *base; -}; - -struct omap1_spi100k_cs { - void __iomem *base; - int word_len; -}; - -static void spi100k_enable_clock(struct spi_master *master) -{ - unsigned int val; - struct omap1_spi100k *spi100k = spi_master_get_devdata(master); - - /* enable SPI */ - val = readw(spi100k->base + SPI_SETUP1); - val |= SPI_SETUP1_CLOCK_ENABLE; - writew(val, spi100k->base + SPI_SETUP1); -} - -static void spi100k_disable_clock(struct spi_master *master) -{ - unsigned int val; - struct omap1_spi100k *spi100k = spi_master_get_devdata(master); - - /* disable SPI */ - val = readw(spi100k->base + SPI_SETUP1); - val &= ~SPI_SETUP1_CLOCK_ENABLE; - writew(val, spi100k->base + SPI_SETUP1); -} - -static void spi100k_write_data(struct spi_master *master, int len, int data) -{ - struct omap1_spi100k *spi100k = spi_master_get_devdata(master); - - /* write 16-bit word, shifting 8-bit data if necessary */ - if (len <= 8) { - data <<= 8; - len = 16; - } - - spi100k_enable_clock(master); - writew(data, spi100k->base + SPI_TX_MSB); - - writew(SPI_CTRL_SEN(0) | - SPI_CTRL_WORD_SIZE(len) | - SPI_CTRL_WR, - spi100k->base + SPI_CTRL); - - /* Wait for bit ack send change */ - while ((readw(spi100k->base + SPI_STATUS) & SPI_STATUS_WE) != SPI_STATUS_WE) - ; - udelay(1000); - - spi100k_disable_clock(master); -} - -static int spi100k_read_data(struct spi_master *master, int len) -{ - int dataL; - struct omap1_spi100k *spi100k = spi_master_get_devdata(master); - - /* Always do at least 16 bits */ - if (len <= 8) - len = 16; - - spi100k_enable_clock(master); - writew(SPI_CTRL_SEN(0) | - SPI_CTRL_WORD_SIZE(len) | - SPI_CTRL_RD, - spi100k->base + SPI_CTRL); - - while ((readw(spi100k->base + SPI_STATUS) & SPI_STATUS_RD) != SPI_STATUS_RD) - ; - udelay(1000); - - dataL = readw(spi100k->base + SPI_RX_LSB); - readw(spi100k->base + SPI_RX_MSB); - spi100k_disable_clock(master); - - return dataL; -} - -static void spi100k_open(struct spi_master *master) -{ - /* get control of SPI */ - struct omap1_spi100k *spi100k = spi_master_get_devdata(master); - - writew(SPI_SETUP1_INT_READ_ENABLE | - SPI_SETUP1_INT_WRITE_ENABLE | - SPI_SETUP1_CLOCK_DIVISOR(0), spi100k->base + SPI_SETUP1); - - /* configure clock and interrupts */ - writew(SPI_SETUP2_ACTIVE_EDGE_FALLING | - SPI_SETUP2_NEGATIVE_LEVEL | - SPI_SETUP2_LEVEL_TRIGGER, spi100k->base + SPI_SETUP2); -} - -static void omap1_spi100k_force_cs(struct omap1_spi100k *spi100k, int enable) -{ - if (enable) - writew(0x05fc, spi100k->base + SPI_CTRL); - else - writew(0x05fd, spi100k->base + SPI_CTRL); -} - -static unsigned -omap1_spi100k_txrx_pio(struct spi_device *spi, struct spi_transfer *xfer) -{ - struct omap1_spi100k_cs *cs = spi->controller_state; - unsigned int count, c; - int word_len; - - count = xfer->len; - c = count; - word_len = cs->word_len; - - if (word_len <= 8) { - u8 *rx; - const u8 *tx; - - rx = xfer->rx_buf; - tx = xfer->tx_buf; - do { - c -= 1; - if (xfer->tx_buf != NULL) - spi100k_write_data(spi->master, word_len, *tx++); - if (xfer->rx_buf != NULL) - *rx++ = spi100k_read_data(spi->master, word_len); - } while (c); - } else if (word_len <= 16) { - u16 *rx; - const u16 *tx; - - rx = xfer->rx_buf; - tx = xfer->tx_buf; - do { - c -= 2; - if (xfer->tx_buf != NULL) - spi100k_write_data(spi->master, word_len, *tx++); - if (xfer->rx_buf != NULL) - *rx++ = spi100k_read_data(spi->master, word_len); - } while (c); - } else if (word_len <= 32) { - u32 *rx; - const u32 *tx; - - rx = xfer->rx_buf; - tx = xfer->tx_buf; - do { - c -= 4; - if (xfer->tx_buf != NULL) - spi100k_write_data(spi->master, word_len, *tx); - if (xfer->rx_buf != NULL) - *rx = spi100k_read_data(spi->master, word_len); - } while (c); - } - return count - c; -} - -/* called only when no transfer is active to this device */ -static int omap1_spi100k_setup_transfer(struct spi_device *spi, - struct spi_transfer *t) -{ - struct omap1_spi100k *spi100k = spi_master_get_devdata(spi->master); - struct omap1_spi100k_cs *cs = spi->controller_state; - u8 word_len; - - if (t != NULL) - word_len = t->bits_per_word; - else - word_len = spi->bits_per_word; - - if (word_len > 32) - return -EINVAL; - cs->word_len = word_len; - - /* SPI init before transfer */ - writew(0x3e, spi100k->base + SPI_SETUP1); - writew(0x00, spi100k->base + SPI_STATUS); - writew(0x3e, spi100k->base + SPI_CTRL); - - return 0; -} - -/* the spi->mode bits understood by this driver: */ -#define MODEBITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH) - -static int omap1_spi100k_setup(struct spi_device *spi) -{ - int ret; - struct omap1_spi100k *spi100k; - struct omap1_spi100k_cs *cs = spi->controller_state; - - spi100k = spi_master_get_devdata(spi->master); - - if (!cs) { - cs = devm_kzalloc(&spi->dev, sizeof(*cs), GFP_KERNEL); - if (!cs) - return -ENOMEM; - cs->base = spi100k->base + spi->chip_select * 0x14; - spi->controller_state = cs; - } - - spi100k_open(spi->master); - - clk_prepare_enable(spi100k->ick); - clk_prepare_enable(spi100k->fck); - - ret = omap1_spi100k_setup_transfer(spi, NULL); - - clk_disable_unprepare(spi100k->ick); - clk_disable_unprepare(spi100k->fck); - - return ret; -} - -static int omap1_spi100k_transfer_one_message(struct spi_master *master, - struct spi_message *m) -{ - struct omap1_spi100k *spi100k = spi_master_get_devdata(master); - struct spi_device *spi = m->spi; - struct spi_transfer *t = NULL; - int cs_active = 0; - int status = 0; - - list_for_each_entry(t, &m->transfers, transfer_list) { - if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) { - break; - } - status = omap1_spi100k_setup_transfer(spi, t); - if (status < 0) - break; - - if (!cs_active) { - omap1_spi100k_force_cs(spi100k, 1); - cs_active = 1; - } - - if (t->len) { - unsigned count; - - count = omap1_spi100k_txrx_pio(spi, t); - m->actual_length += count; - - if (count != t->len) { - break; - } - } - - spi_transfer_delay_exec(t); - - /* ignore the "leave it on after last xfer" hint */ - - if (t->cs_change) { - omap1_spi100k_force_cs(spi100k, 0); - cs_active = 0; - } - } - - status = omap1_spi100k_setup_transfer(spi, NULL); - - if (cs_active) - omap1_spi100k_force_cs(spi100k, 0); - - m->status = status; - - spi_finalize_current_message(master); - - return status; -} - -static int omap1_spi100k_probe(struct platform_device *pdev) -{ - struct spi_master *master; - struct omap1_spi100k *spi100k; - int status = 0; - - if (!pdev->id) - return -EINVAL; - - master = spi_alloc_master(&pdev->dev, sizeof(*spi100k)); - if (master == NULL) { - dev_dbg(&pdev->dev, "master allocation failed\n"); - return -ENOMEM; - } - - if (pdev->id != -1) - master->bus_num = pdev->id; - - master->setup = omap1_spi100k_setup; - master->transfer_one_message = omap1_spi100k_transfer_one_message; - master->num_chipselect = 2; - master->mode_bits = MODEBITS; - master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32); - master->min_speed_hz = OMAP1_SPI100K_MAX_FREQ/(1<<16); - master->max_speed_hz = OMAP1_SPI100K_MAX_FREQ; - master->auto_runtime_pm = true; - - spi100k = spi_master_get_devdata(master); - - /* - * The memory region base address is taken as the platform_data. - * You should allocate this with ioremap() before initializing - * the SPI. - */ - spi100k->base = (void __iomem *)dev_get_platdata(&pdev->dev); - - spi100k->ick = devm_clk_get(&pdev->dev, "ick"); - if (IS_ERR(spi100k->ick)) { - dev_dbg(&pdev->dev, "can't get spi100k_ick\n"); - status = PTR_ERR(spi100k->ick); - goto err; - } - - spi100k->fck = devm_clk_get(&pdev->dev, "fck"); - if (IS_ERR(spi100k->fck)) { - dev_dbg(&pdev->dev, "can't get spi100k_fck\n"); - status = PTR_ERR(spi100k->fck); - goto err; - } - - status = clk_prepare_enable(spi100k->ick); - if (status != 0) { - dev_err(&pdev->dev, "failed to enable ick: %d\n", status); - goto err; - } - - status = clk_prepare_enable(spi100k->fck); - if (status != 0) { - dev_err(&pdev->dev, "failed to enable fck: %d\n", status); - goto err_ick; - } - - pm_runtime_enable(&pdev->dev); - pm_runtime_set_active(&pdev->dev); - - status = devm_spi_register_master(&pdev->dev, master); - if (status < 0) - goto err_fck; - - return status; - -err_fck: - pm_runtime_disable(&pdev->dev); - clk_disable_unprepare(spi100k->fck); -err_ick: - clk_disable_unprepare(spi100k->ick); -err: - spi_master_put(master); - return status; -} - -static int omap1_spi100k_remove(struct platform_device *pdev) -{ - struct spi_master *master = platform_get_drvdata(pdev); - struct omap1_spi100k *spi100k = spi_master_get_devdata(master); - - pm_runtime_disable(&pdev->dev); - - clk_disable_unprepare(spi100k->fck); - clk_disable_unprepare(spi100k->ick); - - return 0; -} - -#ifdef CONFIG_PM -static int omap1_spi100k_runtime_suspend(struct device *dev) -{ - struct spi_master *master = dev_get_drvdata(dev); - struct omap1_spi100k *spi100k = spi_master_get_devdata(master); - - clk_disable_unprepare(spi100k->ick); - clk_disable_unprepare(spi100k->fck); - - return 0; -} - -static int omap1_spi100k_runtime_resume(struct device *dev) -{ - struct spi_master *master = dev_get_drvdata(dev); - struct omap1_spi100k *spi100k = spi_master_get_devdata(master); - int ret; - - ret = clk_prepare_enable(spi100k->ick); - if (ret != 0) { - dev_err(dev, "Failed to enable ick: %d\n", ret); - return ret; - } - - ret = clk_prepare_enable(spi100k->fck); - if (ret != 0) { - dev_err(dev, "Failed to enable fck: %d\n", ret); - clk_disable_unprepare(spi100k->ick); - return ret; - } - - return 0; -} -#endif - -static const struct dev_pm_ops omap1_spi100k_pm = { - SET_RUNTIME_PM_OPS(omap1_spi100k_runtime_suspend, - omap1_spi100k_runtime_resume, NULL) -}; - -static struct platform_driver omap1_spi100k_driver = { - .driver = { - .name = "omap1_spi100k", - .pm = &omap1_spi100k_pm, - }, - .probe = omap1_spi100k_probe, - .remove = omap1_spi100k_remove, -}; - -module_platform_driver(omap1_spi100k_driver); - -MODULE_DESCRIPTION("OMAP7xx SPI 100k controller driver"); -MODULE_AUTHOR("Fabrice Crohas <fcrohas@gmail.com>"); -MODULE_LICENSE("GPL"); diff --git a/drivers/spi/spi-omap-uwire.c b/drivers/spi/spi-omap-uwire.c index 29198e6815b2..20c87163d612 100644 --- a/drivers/spi/spi-omap-uwire.c +++ b/drivers/spi/spi-omap-uwire.c @@ -99,7 +99,7 @@ struct uwire_state { * Or, put it in a structure which is used throughout the driver; * that avoids having to issue two loads for each bit of static data. */ -static unsigned int uwire_idx_shift; +static unsigned int uwire_idx_shift = 2; static void __iomem *uwire_base; static inline void uwire_write_reg(int idx, u16 val) @@ -481,11 +481,6 @@ static int uwire_probe(struct platform_device *pdev) } clk_prepare_enable(uwire->ck); - if (cpu_is_omap7xx()) - uwire_idx_shift = 1; - else - uwire_idx_shift = 2; - uwire_write_reg(UWIRE_SR3, 1); /* the spi->mode bits understood by this driver: */ @@ -536,15 +531,6 @@ static struct platform_driver uwire_driver = { static int __init omap_uwire_init(void) { - /* FIXME move these into the relevant board init code. also, include - * H3 support; it uses tsc2101 like H2 (on a different chipselect). - */ - - if (machine_is_omap_h2()) { - /* defaults: W21 SDO, U18 SDI, V19 SCL */ - omap_cfg_reg(N14_1610_UWIRE_CS0); - omap_cfg_reg(N15_1610_UWIRE_CS1); - } return platform_driver_register(&uwire_driver); } diff --git a/drivers/spi/spi-s3c24xx-regs.h b/drivers/spi/spi-s3c24xx-regs.h deleted file mode 100644 index f51464ab5677..000000000000 --- a/drivers/spi/spi-s3c24xx-regs.h +++ /dev/null @@ -1,41 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -/* - * Copyright (c) 2004 Fetron GmbH - * - * S3C2410 SPI register definition - */ - -#ifndef __SPI_S3C2410_H -#define __SPI_S3C2410_H - -#define S3C2410_SPCON (0x00) - -#define S3C2410_SPCON_SMOD_DMA (2 << 5) /* DMA mode */ -#define S3C2410_SPCON_SMOD_INT (1 << 5) /* interrupt mode */ -#define S3C2410_SPCON_SMOD_POLL (0 << 5) /* polling mode */ -#define S3C2410_SPCON_ENSCK (1 << 4) /* Enable SCK */ -#define S3C2410_SPCON_MSTR (1 << 3) /* Master:1, Slave:0 select */ -#define S3C2410_SPCON_CPOL_HIGH (1 << 2) /* Clock polarity select */ -#define S3C2410_SPCON_CPOL_LOW (0 << 2) /* Clock polarity select */ - -#define S3C2410_SPCON_CPHA_FMTB (1 << 1) /* Clock Phase Select */ -#define S3C2410_SPCON_CPHA_FMTA (0 << 1) /* Clock Phase Select */ - -#define S3C2410_SPSTA (0x04) - -#define S3C2410_SPSTA_DCOL (1 << 2) /* Data Collision Error */ -#define S3C2410_SPSTA_MULD (1 << 1) /* Multi Master Error */ -#define S3C2410_SPSTA_READY (1 << 0) /* Data Tx/Rx ready */ -#define S3C2412_SPSTA_READY_ORG (1 << 3) - -#define S3C2410_SPPIN (0x08) - -#define S3C2410_SPPIN_ENMUL (1 << 2) /* Multi Master Error detect */ -#define S3C2410_SPPIN_RESERVED (1 << 1) -#define S3C2410_SPPIN_KEEP (1 << 0) /* Master Out keep */ - -#define S3C2410_SPPRE (0x0C) -#define S3C2410_SPTDAT (0x10) -#define S3C2410_SPRDAT (0x14) - -#endif /* __SPI_S3C2410_H */ diff --git a/drivers/spi/spi-s3c24xx.c b/drivers/spi/spi-s3c24xx.c deleted file mode 100644 index ef25b5e93900..000000000000 --- a/drivers/spi/spi-s3c24xx.c +++ /dev/null @@ -1,596 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * Copyright (c) 2006 Ben Dooks - * Copyright 2006-2009 Simtec Electronics - * Ben Dooks <ben@simtec.co.uk> -*/ - -#include <linux/spinlock.h> -#include <linux/interrupt.h> -#include <linux/delay.h> -#include <linux/errno.h> -#include <linux/err.h> -#include <linux/clk.h> -#include <linux/platform_device.h> -#include <linux/io.h> -#include <linux/slab.h> - -#include <linux/spi/spi.h> -#include <linux/spi/spi_bitbang.h> -#include <linux/spi/s3c24xx.h> -#include <linux/spi/s3c24xx-fiq.h> -#include <linux/module.h> - -#include <asm/fiq.h> - -#include "spi-s3c24xx-regs.h" - -/** - * struct s3c24xx_spi_devstate - per device data - * @hz: Last frequency calculated for @sppre field. - * @mode: Last mode setting for the @spcon field. - * @spcon: Value to write to the SPCON register. - * @sppre: Value to write to the SPPRE register. - */ -struct s3c24xx_spi_devstate { - unsigned int hz; - unsigned int mode; - u8 spcon; - u8 sppre; -}; - -enum spi_fiq_mode { - FIQ_MODE_NONE = 0, - FIQ_MODE_TX = 1, - FIQ_MODE_RX = 2, - FIQ_MODE_TXRX = 3, -}; - -struct s3c24xx_spi { - /* bitbang has to be first */ - struct spi_bitbang bitbang; - struct completion done; - - void __iomem *regs; - int irq; - int len; - int count; - - struct fiq_handler fiq_handler; - enum spi_fiq_mode fiq_mode; - unsigned char fiq_inuse; - unsigned char fiq_claimed; - - /* data buffers */ - const unsigned char *tx; - unsigned char *rx; - - struct clk *clk; - struct spi_master *master; - struct spi_device *curdev; - struct device *dev; - struct s3c2410_spi_info *pdata; -}; - -#define SPCON_DEFAULT (S3C2410_SPCON_MSTR | S3C2410_SPCON_SMOD_INT) -#define SPPIN_DEFAULT (S3C2410_SPPIN_KEEP) - -static inline struct s3c24xx_spi *to_hw(struct spi_device *sdev) -{ - return spi_master_get_devdata(sdev->master); -} - -static void s3c24xx_spi_chipsel(struct spi_device *spi, int value) -{ - struct s3c24xx_spi_devstate *cs = spi->controller_state; - struct s3c24xx_spi *hw = to_hw(spi); - - /* change the chipselect state and the state of the spi engine clock */ - - switch (value) { - case BITBANG_CS_INACTIVE: - writeb(cs->spcon, hw->regs + S3C2410_SPCON); - break; - - case BITBANG_CS_ACTIVE: - writeb(cs->spcon | S3C2410_SPCON_ENSCK, - hw->regs + S3C2410_SPCON); - break; - } -} - -static int s3c24xx_spi_update_state(struct spi_device *spi, - struct spi_transfer *t) -{ - struct s3c24xx_spi *hw = to_hw(spi); - struct s3c24xx_spi_devstate *cs = spi->controller_state; - unsigned int hz; - unsigned int div; - unsigned long clk; - - hz = t ? t->speed_hz : spi->max_speed_hz; - - if (!hz) - hz = spi->max_speed_hz; - - if (spi->mode != cs->mode) { - u8 spcon = SPCON_DEFAULT | S3C2410_SPCON_ENSCK; - - if (spi->mode & SPI_CPHA) - spcon |= S3C2410_SPCON_CPHA_FMTB; - - if (spi->mode & SPI_CPOL) - spcon |= S3C2410_SPCON_CPOL_HIGH; - - cs->mode = spi->mode; - cs->spcon = spcon; - } - - if (cs->hz != hz) { - clk = clk_get_rate(hw->clk); - div = DIV_ROUND_UP(clk, hz * 2) - 1; - - if (div > 255) - div = 255; - - dev_dbg(&spi->dev, "pre-scaler=%d (wanted %d, got %ld)\n", - div, hz, clk / (2 * (div + 1))); - - cs->hz = hz; - cs->sppre = div; - } - - return 0; -} - -static int s3c24xx_spi_setupxfer(struct spi_device *spi, - struct spi_transfer *t) -{ - struct s3c24xx_spi_devstate *cs = spi->controller_state; - struct s3c24xx_spi *hw = to_hw(spi); - int ret; - - ret = s3c24xx_spi_update_state(spi, t); - if (!ret) - writeb(cs->sppre, hw->regs + S3C2410_SPPRE); - - return ret; -} - -static int s3c24xx_spi_setup(struct spi_device *spi) -{ - struct s3c24xx_spi_devstate *cs = spi->controller_state; - struct s3c24xx_spi *hw = to_hw(spi); - int ret; - - /* allocate settings on the first call */ - if (!cs) { - cs = devm_kzalloc(&spi->dev, - sizeof(struct s3c24xx_spi_devstate), - GFP_KERNEL); - if (!cs) - return -ENOMEM; - - cs->spcon = SPCON_DEFAULT; - cs->hz = -1; - spi->controller_state = cs; - } - - /* initialise the state from the device */ - ret = s3c24xx_spi_update_state(spi, NULL); - if (ret) - return ret; - - mutex_lock(&hw->bitbang.lock); - if (!hw->bitbang.busy) { - hw->bitbang.chipselect(spi, BITBANG_CS_INACTIVE); - /* need to ndelay for 0.5 clocktick ? */ - } - mutex_unlock(&hw->bitbang.lock); - - return 0; -} - -static inline unsigned int hw_txbyte(struct s3c24xx_spi *hw, int count) -{ - return hw->tx ? hw->tx[count] : 0; -} - -#ifdef CONFIG_SPI_S3C24XX_FIQ -/* Support for FIQ based pseudo-DMA to improve the transfer speed. - * - * This code uses the assembly helper in spi_s3c24xx_spi.S which is - * used by the FIQ core to move data between main memory and the peripheral - * block. Since this is code running on the processor, there is no problem - * with cache coherency of the buffers, so we can use any buffer we like. - */ - -/** - * struct spi_fiq_code - FIQ code and header - * @length: The length of the code fragment, excluding this header. - * @ack_offset: The offset from @data to the word to place the IRQ ACK bit at. - * @data: The code itself to install as a FIQ handler. - */ -struct spi_fiq_code { - u32 length; - u32 ack_offset; - u8 data[]; -}; - -/** - * s3c24xx_spi_tryfiq - attempt to claim and setup FIQ for transfer - * @hw: The hardware state. - * - * Claim the FIQ handler (only one can be active at any one time) and - * then setup the correct transfer code for this transfer. - * - * This call updates all the necessary state information if successful, - * so the caller does not need to do anything more than start the transfer - * as normal, since the IRQ will have been re-routed to the FIQ handler. -*/ -static void s3c24xx_spi_tryfiq(struct s3c24xx_spi *hw) -{ - struct pt_regs regs; - enum spi_fiq_mode mode; - struct spi_fiq_code *code; - u32 *ack_ptr = NULL; - int ret; - - if (!hw->fiq_claimed) { - /* try and claim fiq if we haven't got it, and if not - * then return and simply use another transfer method */ - - ret = claim_fiq(&hw->fiq_handler); - if (ret) - return; - } - - if (hw->tx && !hw->rx) - mode = FIQ_MODE_TX; - else if (hw->rx && !hw->tx) - mode = FIQ_MODE_RX; - else - mode = FIQ_MODE_TXRX; - - regs.uregs[fiq_rspi] = (long)hw->regs; - regs.uregs[fiq_rrx] = (long)hw->rx; - regs.uregs[fiq_rtx] = (long)hw->tx + 1; - regs.uregs[fiq_rcount] = hw->len - 1; - - set_fiq_regs(®s); - - if (hw->fiq_mode != mode) { - hw->fiq_mode = mode; - - switch (mode) { - case FIQ_MODE_TX: - code = &s3c24xx_spi_fiq_tx; - break; - case FIQ_MODE_RX: - code = &s3c24xx_spi_fiq_rx; - break; - case FIQ_MODE_TXRX: - code = &s3c24xx_spi_fiq_txrx; - break; - default: - code = NULL; - } - - BUG_ON(!code); - - ack_ptr = (u32 *)&code->data[code->ack_offset]; - set_fiq_handler(&code->data, code->length); - } - - s3c24xx_set_fiq(hw->irq, ack_ptr, true); - - hw->fiq_mode = mode; - hw->fiq_inuse = 1; -} - -/** - * s3c24xx_spi_fiqop - FIQ core code callback - * @pw: Data registered with the handler - * @release: Whether this is a release or a return. - * - * Called by the FIQ code when another module wants to use the FIQ, so - * return whether we are currently using this or not and then update our - * internal state. - */ -static int s3c24xx_spi_fiqop(void *pw, int release) -{ - struct s3c24xx_spi *hw = pw; - int ret = 0; - - if (release) { - if (hw->fiq_inuse) - ret = -EBUSY; - - /* note, we do not need to unroute the FIQ, as the FIQ - * vector code de-routes it to signal the end of transfer */ - - hw->fiq_mode = FIQ_MODE_NONE; - hw->fiq_claimed = 0; - } else { - hw->fiq_claimed = 1; - } - - return ret; -} - -/** - * s3c24xx_spi_initfiq - setup the information for the FIQ core - * @hw: The hardware state. - * - * Setup the fiq_handler block to pass to the FIQ core. - */ -static inline void s3c24xx_spi_initfiq(struct s3c24xx_spi *hw) -{ - hw->fiq_handler.dev_id = hw; - hw->fiq_handler.name = dev_name(hw->dev); - hw->fiq_handler.fiq_op = s3c24xx_spi_fiqop; -} - -/** - * s3c24xx_spi_usefiq - return if we should be using FIQ. - * @hw: The hardware state. - * - * Return true if the platform data specifies whether this channel is - * allowed to use the FIQ. - */ -static inline bool s3c24xx_spi_usefiq(struct s3c24xx_spi *hw) -{ - return hw->pdata->use_fiq; -} - -/** - * s3c24xx_spi_usingfiq - return if channel is using FIQ - * @spi: The hardware state. - * - * Return whether the channel is currently using the FIQ (separate from - * whether the FIQ is claimed). - */ -static inline bool s3c24xx_spi_usingfiq(struct s3c24xx_spi *spi) -{ - return spi->fiq_inuse; -} -#else - -static inline void s3c24xx_spi_initfiq(struct s3c24xx_spi *s) { } -static inline void s3c24xx_spi_tryfiq(struct s3c24xx_spi *s) { } -static inline bool s3c24xx_spi_usefiq(struct s3c24xx_spi *s) { return false; } -static inline bool s3c24xx_spi_usingfiq(struct s3c24xx_spi *s) { return false; } - -#endif /* CONFIG_SPI_S3C24XX_FIQ */ - -static int s3c24xx_spi_txrx(struct spi_device *spi, struct spi_transfer *t) -{ - struct s3c24xx_spi *hw = to_hw(spi); - - hw->tx = t->tx_buf; - hw->rx = t->rx_buf; - hw->len = t->len; - hw->count = 0; - - init_completion(&hw->done); - - hw->fiq_inuse = 0; - if (s3c24xx_spi_usefiq(hw) && t->len >= 3) - s3c24xx_spi_tryfiq(hw); - - /* send the first byte */ - writeb(hw_txbyte(hw, 0), hw->regs + S3C2410_SPTDAT); - - wait_for_completion(&hw->done); - return hw->count; -} - -static irqreturn_t s3c24xx_spi_irq(int irq, void *dev) -{ - struct s3c24xx_spi *hw = dev; - unsigned int spsta = readb(hw->regs + S3C2410_SPSTA); - unsigned int count = hw->count; - - if (spsta & S3C2410_SPSTA_DCOL) { - dev_dbg(hw->dev, "data-collision\n"); - complete(&hw->done); - goto irq_done; - } - - if (!(spsta & S3C2410_SPSTA_READY)) { - dev_dbg(hw->dev, "spi not ready for tx?\n"); - complete(&hw->done); - goto irq_done; - } - - if (!s3c24xx_spi_usingfiq(hw)) { - hw->count++; - - if (hw->rx) - hw->rx[count] = readb(hw->regs + S3C2410_SPRDAT); - - count++; - - if (count < hw->len) - writeb(hw_txbyte(hw, count), hw->regs + S3C2410_SPTDAT); - else - complete(&hw->done); - } else { - hw->count = hw->len; - hw->fiq_inuse = 0; - - if (hw->rx) - hw->rx[hw->len-1] = readb(hw->regs + S3C2410_SPRDAT); - - complete(&hw->done); - } - - irq_done: - return IRQ_HANDLED; -} - -static void s3c24xx_spi_initialsetup(struct s3c24xx_spi *hw) -{ - /* for the moment, permanently enable the clock */ - - clk_enable(hw->clk); - - /* program defaults into the registers */ - - writeb(0xff, hw->regs + S3C2410_SPPRE); - writeb(SPPIN_DEFAULT, hw->regs + S3C2410_SPPIN); - writeb(SPCON_DEFAULT, hw->regs + S3C2410_SPCON); -} - -static int s3c24xx_spi_probe(struct platform_device *pdev) -{ - struct s3c2410_spi_info *pdata; - struct s3c24xx_spi *hw; - struct spi_master *master; - int err = 0; - - master = devm_spi_alloc_master(&pdev->dev, sizeof(struct s3c24xx_spi)); - if (master == NULL) { - dev_err(&pdev->dev, "No memory for spi_master\n"); - return -ENOMEM; - } - - hw = spi_master_get_devdata(master); - - hw->master = master; - hw->pdata = pdata = dev_get_platdata(&pdev->dev); - hw->dev = &pdev->dev; - - if (pdata == NULL) { - dev_err(&pdev->dev, "No platform data supplied\n"); - return -ENOENT; - } - - platform_set_drvdata(pdev, hw); - init_completion(&hw->done); - - /* initialise fiq handler */ - - s3c24xx_spi_initfiq(hw); - - /* setup the master state. */ - - /* the spi->mode bits understood by this driver: */ - master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; - - master->num_chipselect = hw->pdata->num_cs; - master->bus_num = pdata->bus_num; - master->bits_per_word_mask = SPI_BPW_MASK(8); - /* we need to call the local chipselect callback */ - master->flags = SPI_MASTER_GPIO_SS; - master->use_gpio_descriptors = true; - - /* setup the state for the bitbang driver */ - - hw->bitbang.master = hw->master; - hw->bitbang.setup_transfer = s3c24xx_spi_setupxfer; - hw->bitbang.chipselect = s3c24xx_spi_chipsel; - hw->bitbang.txrx_bufs = s3c24xx_spi_txrx; - - hw->master->setup = s3c24xx_spi_setup; - - dev_dbg(hw->dev, "bitbang at %p\n", &hw->bitbang); - - /* find and map our resources */ - hw->regs = devm_platform_ioremap_resource(pdev, 0); - if (IS_ERR(hw->regs)) - return PTR_ERR(hw->regs); - - hw->irq = platform_get_irq(pdev, 0); - if (hw->irq < 0) - return -ENOENT; - - err = devm_request_irq(&pdev->dev, hw->irq, s3c24xx_spi_irq, 0, - pdev->name, hw); - if (err) { - dev_err(&pdev->dev, "Cannot claim IRQ\n"); - return err; - } - - hw->clk = devm_clk_get(&pdev->dev, "spi"); - if (IS_ERR(hw->clk)) { - dev_err(&pdev->dev, "No clock for device\n"); - return PTR_ERR(hw->clk); - } - - s3c24xx_spi_initialsetup(hw); - - /* register our spi controller */ - - err = spi_bitbang_start(&hw->bitbang); - if (err) { - dev_err(&pdev->dev, "Failed to register SPI master\n"); - goto err_register; - } - - return 0; - - err_register: - clk_disable(hw->clk); - - return err; -} - -static int s3c24xx_spi_remove(struct platform_device *dev) -{ - struct s3c24xx_spi *hw = platform_get_drvdata(dev); - - spi_bitbang_stop(&hw->bitbang); - clk_disable(hw->clk); - spi_master_put(hw->master); - return 0; -} - - -#ifdef CONFIG_PM - -static int s3c24xx_spi_suspend(struct device *dev) -{ - struct s3c24xx_spi *hw = dev_get_drvdata(dev); - int ret; - - ret = spi_master_suspend(hw->master); - if (ret) - return ret; - - clk_disable(hw->clk); - return 0; -} - -static int s3c24xx_spi_resume(struct device *dev) -{ - struct s3c24xx_spi *hw = dev_get_drvdata(dev); - - s3c24xx_spi_initialsetup(hw); - return spi_master_resume(hw->master); -} - -static const struct dev_pm_ops s3c24xx_spi_pmops = { - .suspend = s3c24xx_spi_suspend, - .resume = s3c24xx_spi_resume, -}; - -#define S3C24XX_SPI_PMOPS &s3c24xx_spi_pmops -#else -#define S3C24XX_SPI_PMOPS NULL -#endif /* CONFIG_PM */ - -MODULE_ALIAS("platform:s3c2410-spi"); -static struct platform_driver s3c24xx_spi_driver = { - .probe = s3c24xx_spi_probe, - .remove = s3c24xx_spi_remove, - .driver = { - .name = "s3c2410-spi", - .pm = S3C24XX_SPI_PMOPS, - }, -}; -module_platform_driver(s3c24xx_spi_driver); - -MODULE_DESCRIPTION("S3C24XX SPI Driver"); -MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>"); -MODULE_LICENSE("GPL"); |