diff options
Diffstat (limited to 'target/linux/lantiq/patches-4.1/0100-spi-add-support-for-Lantiq-SPI-controller.patch')
-rw-r--r-- | target/linux/lantiq/patches-4.1/0100-spi-add-support-for-Lantiq-SPI-controller.patch | 1133 |
1 files changed, 0 insertions, 1133 deletions
diff --git a/target/linux/lantiq/patches-4.1/0100-spi-add-support-for-Lantiq-SPI-controller.patch b/target/linux/lantiq/patches-4.1/0100-spi-add-support-for-Lantiq-SPI-controller.patch deleted file mode 100644 index 052b232e6b..0000000000 --- a/target/linux/lantiq/patches-4.1/0100-spi-add-support-for-Lantiq-SPI-controller.patch +++ /dev/null @@ -1,1133 +0,0 @@ -From 0175fc559debc22fe8d17e9b8ffd1452e0a4667d Mon Sep 17 00:00:00 2001 -From: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> -Date: Tue, 16 Dec 2014 15:40:32 +0100 -Subject: [PATCH 1/2] spi: add support for Lantiq SPI controller - -Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com> ---- - drivers/spi/Kconfig | 7 + - drivers/spi/Makefile | 1 + - drivers/spi/spi-lantiq.c | 1089 ++++++++++++++++++++++++++++++++++++++++++++++ - 3 files changed, 1097 insertions(+) - create mode 100644 drivers/spi/spi-lantiq.c - ---- a/drivers/spi/Kconfig -+++ b/drivers/spi/Kconfig -@@ -334,6 +334,13 @@ config SPI_MESON_SPIFC - This enables master mode support for the SPIFC (SPI flash - controller) available in Amlogic Meson SoCs. - -+config SPI_LANTIQ -+ tristate "Lantiq SPI controller" -+ depends on LANTIQ && (SOC_TYPE_XWAY || SOC_FALCON) -+ help -+ This driver supports the Lantiq SPI controller in master -+ mode. -+ - config SPI_OC_TINY - tristate "OpenCores tiny SPI" - depends on GPIOLIB ---- a/drivers/spi/Makefile -+++ b/drivers/spi/Makefile -@@ -44,6 +44,7 @@ obj-$(CONFIG_SPI_GPIO) += spi-gpio.o - obj-$(CONFIG_SPI_GPIO_OLD) += spi_gpio_old.o - obj-$(CONFIG_SPI_IMG_SPFI) += spi-img-spfi.o - obj-$(CONFIG_SPI_IMX) += spi-imx.o -+obj-$(CONFIG_SPI_LANTIQ) += spi-lantiq.o - obj-$(CONFIG_SPI_LM70_LLP) += spi-lm70llp.o - obj-$(CONFIG_SPI_MESON_SPIFC) += spi-meson-spifc.o - obj-$(CONFIG_SPI_MPC512x_PSC) += spi-mpc512x-psc.o ---- /dev/null -+++ b/drivers/spi/spi-lantiq.c -@@ -0,0 +1,1091 @@ -+/* -+ * Copyright (C) 2011-2015 Daniel Schwierzeck <daniel.schwierzeck@gmail.com> -+ * -+ * This program is free software; you can distribute it and/or modify it -+ * under the terms of the GNU General Public License (Version 2) as -+ * published by the Free Software Foundation. -+ */ -+ -+#include <linux/kernel.h> -+#include <linux/module.h> -+#include <linux/of_device.h> -+#include <linux/io.h> -+#include <linux/delay.h> -+#include <linux/interrupt.h> -+#include <linux/sched.h> -+#include <linux/completion.h> -+#include <linux/spinlock.h> -+#include <linux/err.h> -+#include <linux/gpio.h> -+#include <linux/pm_runtime.h> -+#include <linux/spi/spi.h> -+ -+#include <lantiq_soc.h> -+ -+#define SPI_RX_IRQ_NAME "spi_rx" -+#define SPI_TX_IRQ_NAME "spi_tx" -+#define SPI_ERR_IRQ_NAME "spi_err" -+#define SPI_FRM_IRQ_NAME "spi_frm" -+ -+#define SPI_CLC 0x00 -+#define SPI_PISEL 0x04 -+#define SPI_ID 0x08 -+#define SPI_CON 0x10 -+#define SPI_STAT 0x14 -+#define SPI_WHBSTATE 0x18 -+#define SPI_TB 0x20 -+#define SPI_RB 0x24 -+#define SPI_RXFCON 0x30 -+#define SPI_TXFCON 0x34 -+#define SPI_FSTAT 0x38 -+#define SPI_BRT 0x40 -+#define SPI_BRSTAT 0x44 -+#define SPI_SFCON 0x60 -+#define SPI_SFSTAT 0x64 -+#define SPI_GPOCON 0x70 -+#define SPI_GPOSTAT 0x74 -+#define SPI_FPGO 0x78 -+#define SPI_RXREQ 0x80 -+#define SPI_RXCNT 0x84 -+#define SPI_DMACON 0xec -+#define SPI_IRNEN 0xf4 -+#define SPI_IRNICR 0xf8 -+#define SPI_IRNCR 0xfc -+ -+#define SPI_CLC_SMC_S 16 /* Clock divider for sleep mode */ -+#define SPI_CLC_SMC_M (0xFF << SPI_CLC_SMC_S) -+#define SPI_CLC_RMC_S 8 /* Clock divider for normal run mode */ -+#define SPI_CLC_RMC_M (0xFF << SPI_CLC_RMC_S) -+#define SPI_CLC_DISS BIT(1) /* Disable status bit */ -+#define SPI_CLC_DISR BIT(0) /* Disable request bit */ -+ -+#define SPI_ID_TXFS_S 24 /* Implemented TX FIFO size */ -+#define SPI_ID_TXFS_M (0x3F << SPI_ID_TXFS_S) -+#define SPI_ID_RXFS_S 16 /* Implemented RX FIFO size */ -+#define SPI_ID_RXFS_M (0x3F << SPI_ID_RXFS_S) -+#define SPI_ID_REV_M 0x1F /* Hardware revision number */ -+#define SPI_ID_CFG BIT(5) /* DMA interface support */ -+ -+#define SPI_CON_BM_S 16 /* Data width selection */ -+#define SPI_CON_BM_M (0x1F << SPI_CON_BM_S) -+#define SPI_CON_EM BIT(24) /* Echo mode */ -+#define SPI_CON_IDLE BIT(23) /* Idle bit value */ -+#define SPI_CON_ENBV BIT(22) /* Enable byte valid control */ -+#define SPI_CON_RUEN BIT(12) /* Receive underflow error enable */ -+#define SPI_CON_TUEN BIT(11) /* Transmit underflow error enable */ -+#define SPI_CON_AEN BIT(10) /* Abort error enable */ -+#define SPI_CON_REN BIT(9) /* Receive overflow error enable */ -+#define SPI_CON_TEN BIT(8) /* Transmit overflow error enable */ -+#define SPI_CON_LB BIT(7) /* Loopback control */ -+#define SPI_CON_PO BIT(6) /* Clock polarity control */ -+#define SPI_CON_PH BIT(5) /* Clock phase control */ -+#define SPI_CON_HB BIT(4) /* Heading control */ -+#define SPI_CON_RXOFF BIT(1) /* Switch receiver off */ -+#define SPI_CON_TXOFF BIT(0) /* Switch transmitter off */ -+ -+#define SPI_STAT_RXBV_S 28 -+#define SPI_STAT_RXBV_M (0x7 << SPI_STAT_RXBV_S) -+#define SPI_STAT_BSY BIT(13) /* Busy flag */ -+#define SPI_STAT_RUE BIT(12) /* Receive underflow error flag */ -+#define SPI_STAT_TUE BIT(11) /* Transmit underflow error flag */ -+#define SPI_STAT_AE BIT(10) /* Abort error flag */ -+#define SPI_STAT_RE BIT(9) /* Receive error flag */ -+#define SPI_STAT_TE BIT(8) /* Transmit error flag */ -+#define SPI_STAT_ME BIT(7) /* Mode error flag */ -+#define SPI_STAT_MS BIT(1) /* Master/slave select bit */ -+#define SPI_STAT_EN BIT(0) /* Enable bit */ -+ -+#define SPI_WHBSTATE_SETTUE BIT(15) /* Set transmit underflow error flag */ -+#define SPI_WHBSTATE_SETAE BIT(14) /* Set abort error flag */ -+#define SPI_WHBSTATE_SETRE BIT(13) /* Set receive error flag */ -+#define SPI_WHBSTATE_SETTE BIT(12) /* Set transmit error flag */ -+#define SPI_WHBSTATE_CLRTUE BIT(11) /* Clear transmit underflow error flag */ -+#define SPI_WHBSTATE_CLRAE BIT(10) /* Clear abort error flag */ -+#define SPI_WHBSTATE_CLRRE BIT(9) /* Clear receive error flag */ -+#define SPI_WHBSTATE_CLRTE BIT(8) /* Clear transmit error flag */ -+#define SPI_WHBSTATE_SETME BIT(7) /* Set mode error flag */ -+#define SPI_WHBSTATE_CLRME BIT(6) /* Clear mode error flag */ -+#define SPI_WHBSTATE_SETRUE BIT(5) /* Set receive underflow error flag */ -+#define SPI_WHBSTATE_CLRRUE BIT(4) /* Clear receive underflow error flag */ -+#define SPI_WHBSTATE_SETMS BIT(3) /* Set master select bit */ -+#define SPI_WHBSTATE_CLRMS BIT(2) /* Clear master select bit */ -+#define SPI_WHBSTATE_SETEN BIT(1) /* Set enable bit (operational mode) */ -+#define SPI_WHBSTATE_CLREN BIT(0) /* Clear enable bit (config mode */ -+#define SPI_WHBSTATE_CLR_ERRORS 0x0F50 -+ -+#define SPI_RXFCON_RXFITL_S 8 /* FIFO interrupt trigger level */ -+#define SPI_RXFCON_RXFITL_M (0x3F << SPI_RXFCON_RXFITL_S) -+#define SPI_RXFCON_RXFLU BIT(1) /* FIFO flush */ -+#define SPI_RXFCON_RXFEN BIT(0) /* FIFO enable */ -+ -+#define SPI_TXFCON_TXFITL_S 8 /* FIFO interrupt trigger level */ -+#define SPI_TXFCON_TXFITL_M (0x3F << SPI_TXFCON_TXFITL_S) -+#define SPI_TXFCON_TXFLU BIT(1) /* FIFO flush */ -+#define SPI_TXFCON_TXFEN BIT(0) /* FIFO enable */ -+ -+#define SPI_FSTAT_RXFFL_S 0 -+#define SPI_FSTAT_RXFFL_M (0x3f << SPI_FSTAT_RXFFL_S) -+#define SPI_FSTAT_TXFFL_S 8 -+#define SPI_FSTAT_TXFFL_M (0x3f << SPI_FSTAT_TXFFL_S) -+ -+#define SPI_GPOCON_ISCSBN_S 8 -+#define SPI_GPOCON_INVOUTN_S 0 -+ -+#define SPI_FGPO_SETOUTN_S 8 -+#define SPI_FGPO_CLROUTN_S 0 -+ -+#define SPI_RXREQ_RXCNT_M 0xFFFF /* Receive count value */ -+#define SPI_RXCNT_TODO_M 0xFFFF /* Recevie to-do value */ -+ -+#define SPI_IRNEN_TFI BIT(4) /* TX finished interrupt */ -+#define SPI_IRNEN_F BIT(3) /* Frame end interrupt request */ -+#define SPI_IRNEN_E BIT(2) /* Error end interrupt request */ -+#define SPI_IRNEN_T_XWAY BIT(1) /* Transmit end interrupt request */ -+#define SPI_IRNEN_R_XWAY BIT(0) /* Receive end interrupt request */ -+#define SPI_IRNEN_R_XRX BIT(1) /* Transmit end interrupt request */ -+#define SPI_IRNEN_T_XRX BIT(0) /* Receive end interrupt request */ -+#define SPI_IRNEN_ALL 0x1F -+ -+struct lantiq_spi_hwcfg { -+ unsigned int num_chipselect; -+ unsigned int irnen_r; -+ unsigned int irnen_t; -+}; -+ -+struct lantiq_spi { -+ struct spi_master *master; -+ struct device *dev; -+ void __iomem *regbase; -+ struct clk *spi_clk; -+ struct clk *fpi_clk; -+ const struct lantiq_spi_hwcfg *hwcfg; -+ -+ spinlock_t lock; -+ struct completion xfer_complete; -+ -+ const u8 *tx; -+ u8 *rx; -+ unsigned int tx_todo; -+ unsigned int rx_todo; -+ unsigned int bits_per_word; -+ unsigned int speed_hz; -+ int status; -+ unsigned long timeout; -+ unsigned int cs_delay; -+}; -+ -+struct lantiq_spi_cstate { -+ int cs_gpio; -+}; -+ -+static u32 lantiq_spi_readl(const struct lantiq_spi *spi, u32 reg) -+{ -+ return readl_be(spi->regbase + reg); -+} -+ -+static void lantiq_spi_writel(const struct lantiq_spi *spi, u32 val, u32 reg) -+{ -+ writel_be(val, spi->regbase + reg); -+} -+ -+static void lantiq_spi_maskl(const struct lantiq_spi *spi, u32 clr, u32 set, -+ u32 reg) -+{ -+ u32 val = readl_be(spi->regbase + reg); -+ val &= ~clr; -+ val |= set; -+ writel_be(val, spi->regbase + reg); -+} -+ -+static int supports_dma(const struct lantiq_spi *spi) -+{ -+ u32 id = lantiq_spi_readl(spi, SPI_ID); -+ return id & SPI_ID_CFG; -+} -+ -+static unsigned int tx_fifo_size(const struct lantiq_spi *spi) -+{ -+ u32 id = lantiq_spi_readl(spi, SPI_ID); -+ return (id & SPI_ID_TXFS_M) >> SPI_ID_TXFS_S; -+} -+ -+static unsigned int rx_fifo_size(const struct lantiq_spi *spi) -+{ -+ u32 id = lantiq_spi_readl(spi, SPI_ID); -+ return (id & SPI_ID_RXFS_M) >> SPI_ID_RXFS_S; -+} -+ -+static unsigned int tx_fifo_level(const struct lantiq_spi *spi) -+{ -+ u32 fstat = lantiq_spi_readl(spi, SPI_FSTAT); -+ return (fstat & SPI_FSTAT_TXFFL_M) >> SPI_FSTAT_TXFFL_S; -+} -+ -+static unsigned int rx_fifo_level(const struct lantiq_spi *spi) -+{ -+ u32 fstat = lantiq_spi_readl(spi, SPI_FSTAT); -+ return fstat & SPI_FSTAT_RXFFL_M; -+} -+ -+static unsigned int tx_fifo_free(const struct lantiq_spi *spi) -+{ -+ return tx_fifo_size(spi) - tx_fifo_level(spi); -+} -+ -+static void rx_fifo_reset(const struct lantiq_spi *spi) -+{ -+ u32 val = rx_fifo_size(spi) << SPI_RXFCON_RXFITL_S; -+ val |= SPI_RXFCON_RXFEN | SPI_RXFCON_RXFLU; -+ lantiq_spi_writel(spi, val, SPI_RXFCON); -+} -+ -+static void tx_fifo_reset(const struct lantiq_spi *spi) -+{ -+ u32 val = 1 << SPI_TXFCON_TXFITL_S; -+ val |= SPI_TXFCON_TXFEN | SPI_TXFCON_TXFLU; -+ lantiq_spi_writel(spi, val, SPI_TXFCON); -+} -+ -+static void rx_fifo_flush(const struct lantiq_spi *spi) -+{ -+ lantiq_spi_maskl(spi, 0, SPI_RXFCON_RXFLU, SPI_RXFCON); -+} -+ -+static void tx_fifo_flush(const struct lantiq_spi *spi) -+{ -+ lantiq_spi_maskl(spi, 0, SPI_TXFCON_TXFLU, SPI_TXFCON); -+} -+ -+static int hw_is_busy(const struct lantiq_spi *spi) -+{ -+ u32 stat = lantiq_spi_readl(spi, SPI_STAT); -+ return stat & SPI_STAT_BSY; -+} -+ -+static void hw_enter_config_mode(const struct lantiq_spi *spi) -+{ -+ lantiq_spi_writel(spi, SPI_WHBSTATE_CLREN, SPI_WHBSTATE); -+} -+ -+static void hw_enter_active_mode(const struct lantiq_spi *spi) -+{ -+ lantiq_spi_writel(spi, SPI_WHBSTATE_SETEN, SPI_WHBSTATE); -+} -+ -+static void hw_setup_speed_hz(const struct lantiq_spi *spi, -+ unsigned int max_speed_hz) -+{ -+ u32 spi_clk, brt; -+ -+ /* -+ * SPI module clock is derived from FPI bus clock dependent on -+ * divider value in CLC.RMS which is always set to 1. -+ * -+ * f_SPI -+ * baudrate = -------------- -+ * 2 * (BR + 1) -+ */ -+ spi_clk = clk_get_rate(spi->fpi_clk) / 2; -+ -+ if (max_speed_hz > spi_clk) -+ brt = 0; -+ else -+ brt = spi_clk / max_speed_hz - 1; -+ -+ if (brt > 0xFFFF) -+ brt = 0xFFFF; -+ -+ dev_dbg(spi->dev, "spi_clk %u, max_speed_hz %u, brt %u\n", -+ spi_clk, max_speed_hz, brt); -+ -+ lantiq_spi_writel(spi, brt, SPI_BRT); -+} -+ -+static void hw_setup_bits_per_word(const struct lantiq_spi *spi, -+ unsigned int bits_per_word) -+{ -+ u32 bm; -+ -+ /* CON.BM value = bits_per_word - 1 */ -+ bm = (bits_per_word - 1) << SPI_CON_BM_S; -+ -+ lantiq_spi_maskl(spi, SPI_CON_BM_M, bm, SPI_CON); -+} -+ -+static void hw_setup_clock_mode(const struct lantiq_spi *spi, -+ unsigned int mode) -+{ -+ u32 con_set = 0, con_clr = 0; -+ -+ /* -+ * SPI mode mapping in CON register: -+ * Mode CPOL CPHA CON.PO CON.PH -+ * 0 0 0 0 1 -+ * 1 0 1 0 0 -+ * 2 1 0 1 1 -+ * 3 1 1 1 0 -+ */ -+ if (mode & SPI_CPHA) -+ con_clr |= SPI_CON_PH; -+ else -+ con_set |= SPI_CON_PH; -+ -+ if (mode & SPI_CPOL) -+ con_set |= SPI_CON_PO | SPI_CON_IDLE; -+ else -+ con_clr |= SPI_CON_PO | SPI_CON_IDLE; -+ -+ /* Set heading control */ -+ if (mode & SPI_LSB_FIRST) -+ con_clr |= SPI_CON_HB; -+ else -+ con_set |= SPI_CON_HB; -+ -+ /* Set loopback mode */ -+ if (mode & SPI_LOOP) -+ con_set |= SPI_CON_LB; -+ else -+ con_clr |= SPI_CON_LB; -+ -+ lantiq_spi_maskl(spi, con_clr, con_set, SPI_CON); -+} -+ -+static void lantiq_spi_hw_init(const struct lantiq_spi *spi) -+{ -+ /* -+ * Set clock divider for run mode to 1 to -+ * run at same frequency as FPI bus -+ */ -+ lantiq_spi_writel(spi, 1 << SPI_CLC_RMC_S, SPI_CLC); -+ -+ /* Put controller into config mode */ -+ hw_enter_config_mode(spi); -+ -+ /* Disable all interrupts */ -+ lantiq_spi_writel(spi, 0, SPI_IRNEN); -+ -+ /* Clear error flags */ -+ lantiq_spi_maskl(spi, 0, SPI_WHBSTATE_CLR_ERRORS, SPI_WHBSTATE); -+ -+ /* Enable error checking, disable TX/RX */ -+ lantiq_spi_writel(spi, SPI_CON_RUEN | SPI_CON_AEN | SPI_CON_TEN | -+ SPI_CON_REN | SPI_CON_TXOFF | SPI_CON_RXOFF, SPI_CON); -+ -+ /* Setup default SPI mode */ -+ hw_setup_bits_per_word(spi, spi->bits_per_word); -+ hw_setup_clock_mode(spi, SPI_MODE_0); -+ -+ /* Enable master mode and clear error flags */ -+ lantiq_spi_writel(spi, SPI_WHBSTATE_SETMS | SPI_WHBSTATE_CLR_ERRORS, -+ SPI_WHBSTATE); -+ -+ /* Reset GPIO/CS registers */ -+ lantiq_spi_writel(spi, 0, SPI_GPOCON); -+ lantiq_spi_writel(spi, 0xFF00, SPI_FPGO); -+ -+ /* Enable and flush FIFOs */ -+ rx_fifo_reset(spi); -+ tx_fifo_reset(spi); -+} -+ -+static void hw_chipselect_set(struct lantiq_spi *spi, unsigned int cs) -+{ -+ u32 fgpo = (1 << (cs - 1 + SPI_FGPO_SETOUTN_S)); -+ lantiq_spi_writel(spi, fgpo, SPI_FPGO); -+} -+ -+static void hw_chipselect_clear(struct lantiq_spi *spi, unsigned int cs) -+{ -+ u32 fgpo = (1 << (cs - 1)); -+ lantiq_spi_writel(spi, fgpo, SPI_FPGO); -+} -+ -+static void hw_chipselect_init(struct lantiq_spi *spi, unsigned int cs, -+ unsigned int cs_high) -+{ -+ u32 gpocon; -+ -+ /* set GPO pin to CS mode */ -+ gpocon = 1 << ((cs - 1) + SPI_GPOCON_ISCSBN_S); -+ -+ /* invert GPO pin */ -+ if (cs_high) -+ gpocon |= 1 << (cs - 1); -+ -+ lantiq_spi_maskl(spi, 0, gpocon, SPI_GPOCON); -+} -+ -+static void chipselect_enable(struct spi_device *spidev) -+{ -+ struct lantiq_spi *spi = spi_master_get_devdata(spidev->master); -+ struct lantiq_spi_cstate *cstate = spi_get_ctldata(spidev); -+ -+ if (cstate->cs_gpio >= 0) -+ gpio_set_value(cstate->cs_gpio, spidev->mode & SPI_CS_HIGH); -+ else -+ hw_chipselect_clear(spi, spidev->chip_select); -+ -+ /* CS setup/recovery time */ -+ if (spi->cs_delay) -+ ndelay(spi->cs_delay); -+} -+ -+static void chipselect_disable(struct spi_device *spidev) -+{ -+ struct lantiq_spi *spi = spi_master_get_devdata(spidev->master); -+ struct lantiq_spi_cstate *cstate = spi_get_ctldata(spidev); -+ -+ /* CS hold time */ -+ if (spi->cs_delay) -+ ndelay(spi->cs_delay); -+ -+ if (cstate->cs_gpio >= 0) -+ gpio_set_value(cstate->cs_gpio, !(spidev->mode & SPI_CS_HIGH)); -+ else -+ hw_chipselect_set(spi, spidev->chip_select); -+ -+ /* CS setup/recovery time */ -+ if (spi->cs_delay) -+ ndelay(spi->cs_delay); -+} -+ -+static int lantiq_spi_setup(struct spi_device *spidev) -+{ -+ struct lantiq_spi *spi = spi_master_get_devdata(spidev->master); -+ struct lantiq_spi_cstate *cstate = spi_get_ctldata(spidev); -+ int err; -+ -+ if (!cstate) { -+ cstate = kzalloc(sizeof(*cstate), GFP_KERNEL); -+ if (!cstate) -+ return -ENOMEM; -+ -+ spi_set_ctldata(spidev, cstate); -+ cstate->cs_gpio = -ENOENT; -+ -+ if (spidev->cs_gpio >= 0) { -+ dev_dbg(spi->dev, "using chipselect %u on GPIO %d\n", -+ spidev->chip_select, spidev->cs_gpio); -+ -+ err = gpio_request(spidev->cs_gpio, dev_name(spi->dev)); -+ if (err) -+ return err; -+ -+ gpio_direction_output(spidev->cs_gpio, -+ !(spidev->mode & SPI_CS_HIGH)); -+ -+ cstate->cs_gpio = spidev->cs_gpio; -+ } else { -+ dev_dbg(spi->dev, "using internal chipselect %u\n", -+ spidev->chip_select); -+ -+ hw_chipselect_init(spi, spidev->chip_select, -+ spidev->mode & SPI_CS_HIGH); -+ hw_chipselect_set(spi, spidev->chip_select); -+ } -+ } -+ -+ return 0; -+} -+ -+static void lantiq_spi_cleanup(struct spi_device *spidev) -+{ -+ struct lantiq_spi_cstate *cstate = spi_get_ctldata(spidev); -+ -+ if (cstate->cs_gpio >= 0) -+ gpio_free(cstate->cs_gpio); -+ -+ kfree(cstate); -+ spi_set_ctldata(spidev, NULL); -+} -+ -+static void hw_setup_message(const struct lantiq_spi *spi, -+ struct spi_device *spidev) -+{ -+ const struct lantiq_spi_hwcfg *hwcfg = spi->hwcfg; -+ -+ hw_enter_config_mode(spi); -+ hw_setup_clock_mode(spi, spidev->mode); -+ hw_enter_active_mode(spi); -+ -+ /* Enable interrupts */ -+ lantiq_spi_writel(spi, hwcfg->irnen_t | hwcfg->irnen_r | SPI_IRNEN_E, -+ SPI_IRNEN); -+} -+ -+static void hw_setup_transfer(struct lantiq_spi *spi, struct spi_device *spidev, -+ struct spi_transfer *t) -+{ -+ unsigned int speed_hz, bits_per_word; -+ u32 con; -+ -+ if (t->speed_hz) -+ speed_hz = t->speed_hz; -+ else -+ speed_hz = spidev->max_speed_hz; -+ -+ if (t->bits_per_word) -+ bits_per_word = t->bits_per_word; -+ else -+ bits_per_word = spidev->bits_per_word; -+ -+ if (bits_per_word != spi->bits_per_word || -+ speed_hz != spi->speed_hz) { -+ hw_enter_config_mode(spi); -+ hw_setup_speed_hz(spi, speed_hz); -+ hw_setup_bits_per_word(spi, bits_per_word); -+ hw_enter_active_mode(spi); -+ -+ spi->speed_hz = speed_hz; -+ spi->bits_per_word = bits_per_word; -+ } -+ -+ /* Configure transmitter and receiver */ -+ con = lantiq_spi_readl(spi, SPI_CON); -+ if (t->tx_buf) -+ con &= ~SPI_CON_TXOFF; -+ else -+ con |= SPI_CON_TXOFF; -+ -+ if (t->rx_buf) -+ con &= ~SPI_CON_RXOFF; -+ else -+ con |= SPI_CON_RXOFF; -+ -+ lantiq_spi_writel(spi, con, SPI_CON); -+} -+ -+static void hw_finish_message(const struct lantiq_spi *spi) -+{ -+ /* Disable interrupts */ -+ lantiq_spi_writel(spi, 0, SPI_IRNEN); -+ -+ /* Disable transmitter and receiver */ -+ lantiq_spi_maskl(spi, 0, SPI_CON_TXOFF | SPI_CON_RXOFF, SPI_CON); -+} -+ -+static void tx_fifo_write(struct lantiq_spi *spi) -+{ -+ const u8 *tx8; -+ const u16 *tx16; -+ const u32 *tx32; -+ u32 data; -+ unsigned int tx_free = tx_fifo_free(spi); -+ -+ while (spi->tx_todo && tx_free) { -+ switch (spi->bits_per_word) { -+ case 8: -+ tx8 = spi->tx; -+ data = *tx8; -+ spi->tx_todo--; -+ spi->tx++; -+ break; -+ case 16: -+ tx16 = (u16 *) spi->tx; -+ data = *tx16; -+ spi->tx_todo -= 2; -+ spi->tx += 2; -+ break; -+ case 32: -+ tx32 = (u32 *) spi->tx; -+ data = *tx32; -+ spi->tx_todo -= 4; -+ spi->tx += 4; -+ break; -+ default: -+ BUG(); -+ } -+ -+ lantiq_spi_writel(spi, data, SPI_TB); -+ tx_free--; -+ } -+} -+ -+static void rx_fifo_read_full_duplex(struct lantiq_spi *spi) -+{ -+ u8 *rx8; -+ u16 *rx16; -+ u32 *rx32; -+ u32 data; -+ unsigned int rx_fill = rx_fifo_level(spi); -+ -+ while (rx_fill) { -+ data = lantiq_spi_readl(spi, SPI_RB); -+ -+ switch (spi->bits_per_word) { -+ case 8: -+ rx8 = spi->rx; -+ *rx8 = data; -+ spi->rx_todo--; -+ spi->rx++; -+ break; -+ case 16: -+ rx16 = (u16 *) spi->rx; -+ *rx16 = data; -+ spi->rx_todo -= 2; -+ spi->rx += 2; -+ break; -+ case 32: -+ rx32 = (u32 *) spi->rx; -+ *rx32 = data; -+ spi->rx_todo -= 4; -+ spi->rx += 4; -+ break; -+ default: -+ BUG(); -+ } -+ -+ rx_fill--; -+ } -+} -+ -+static void rx_fifo_read_half_duplex(struct lantiq_spi *spi) -+{ -+ u32 data, *rx32; -+ u8 *rx8; -+ unsigned int rxbv, shift; -+ unsigned int rx_fill = rx_fifo_level(spi); -+ -+ /* -+ * In RX-only mode the bits per word value is ignored by HW. A value -+ * of 32 is used instead. Thus all 4 bytes per FIFO must be read. -+ * If remaining RX bytes are less than 4, the FIFO must be read -+ * differently. The amount of received and valid bytes is indicated -+ * by STAT.RXBV register value. -+ */ -+ while (rx_fill) { -+ if (spi->rx_todo < 4) { -+ rxbv = (lantiq_spi_readl(spi, SPI_STAT) & -+ SPI_STAT_RXBV_M) >> SPI_STAT_RXBV_S; -+ data = lantiq_spi_readl(spi, SPI_RB); -+ -+ shift = (rxbv - 1) * 8; -+ rx8 = spi->rx; -+ -+ while (rxbv) { -+ *rx8++ = (data >> shift) & 0xFF; -+ rxbv--; -+ shift -= 8; -+ spi->rx_todo--; -+ spi->rx++; -+ } -+ } else { -+ data = lantiq_spi_readl(spi, SPI_RB); -+ rx32 = (u32 *) spi->rx; -+ -+ *rx32++ = data; -+ spi->rx_todo -= 4; -+ spi->rx += 4; -+ } -+ rx_fill--; -+ } -+} -+ -+static void rx_request(struct lantiq_spi *spi) -+{ -+ unsigned int rxreq, rxreq_max; -+ -+ /* -+ * To avoid receive overflows at high clocks it is better to request -+ * only the amount of bytes that fits into all FIFOs. This value -+ * depends on the FIFO size implemented in hardware. -+ */ -+ rxreq = spi->rx_todo; -+ rxreq_max = rx_fifo_size(spi) * 4; -+ if (rxreq > rxreq_max) -+ rxreq = rxreq_max; -+ -+ lantiq_spi_writel(spi, rxreq, SPI_RXREQ); -+} -+ -+static irqreturn_t lantiq_spi_xmit_interrupt(int irq, void *data) -+{ -+ struct lantiq_spi *spi = data; -+ -+ /* handle possible interrupts after device initialization */ -+ if (!spi->rx && !spi->tx) -+ return IRQ_HANDLED; -+ -+ if (spi->tx) { -+ if (spi->rx && spi->rx_todo) -+ rx_fifo_read_full_duplex(spi); -+ -+ if (spi->tx_todo) -+ tx_fifo_write(spi); -+ else -+ goto completed; -+ } else if (spi->rx) { -+ if (spi->rx_todo) { -+ rx_fifo_read_half_duplex(spi); -+ -+ if (spi->rx_todo) -+ rx_request(spi); -+ else -+ goto completed; -+ } else -+ goto completed; -+ } -+ -+ return IRQ_HANDLED; -+ -+completed: -+ spi->status = 0; -+ complete(&spi->xfer_complete); -+ -+ return IRQ_HANDLED; -+} -+ -+static irqreturn_t lantiq_spi_err_interrupt(int irq, void *data) -+{ -+ struct lantiq_spi *spi = data; -+ u32 stat = lantiq_spi_readl(spi, SPI_STAT); -+ -+ if (stat & SPI_STAT_RUE) -+ dev_err(spi->dev, "receive underflow error\n"); -+ if (stat & SPI_STAT_TUE) -+ dev_err(spi->dev, "transmit underflow error\n"); -+ if (stat & SPI_STAT_RE) -+ dev_err(spi->dev, "receive overflow error\n"); -+ if (stat & SPI_STAT_TE) -+ dev_err(spi->dev, "transmit overflow error\n"); -+ if (stat & SPI_STAT_ME) -+ dev_err(spi->dev, "mode error\n"); -+ -+ /* Disable all interrupts */ -+ lantiq_spi_writel(spi, 0, SPI_IRNEN); -+ -+ /* Clear error flags */ -+ lantiq_spi_maskl(spi, 0, SPI_WHBSTATE_CLR_ERRORS, SPI_WHBSTATE); -+ -+ /* flush FIFOs */ -+ rx_fifo_flush(spi); -+ tx_fifo_flush(spi); -+ -+ /* set bad status so it can be retried */ -+ spi->status = -EIO; -+ complete(&spi->xfer_complete); -+ -+ return IRQ_HANDLED; -+} -+ -+static int transfer_start(struct lantiq_spi *spi, struct spi_device *spidev, -+ struct spi_transfer *t) -+{ -+ unsigned long flags; -+ -+ spin_lock_irqsave(&spi->lock, flags); -+ -+ spi->tx = t->tx_buf; -+ spi->rx = t->rx_buf; -+ spi->status = -EINPROGRESS; -+ -+ if (t->tx_buf) { -+ spi->tx_todo = t->len; -+ -+ /* initially fill TX FIFO */ -+ tx_fifo_write(spi); -+ } -+ -+ if (spi->rx) { -+ spi->rx_todo = t->len; -+ -+ /* start shift clock in RX-only mode */ -+ if (!spi->tx) -+ rx_request(spi); -+ } -+ -+ spin_unlock_irqrestore(&spi->lock, flags); -+ -+ return 0; -+} -+ -+static int transfer_wait_finished(struct lantiq_spi *spi) -+{ -+ unsigned long timeout; -+ -+ /* wait for completion by interrupt */ -+ timeout = wait_for_completion_timeout(&spi->xfer_complete, -+ msecs_to_jiffies(spi->timeout)); -+ if (!timeout) -+ return -EIO; -+ -+ /* make sure that HW is idle */ -+ timeout = jiffies + msecs_to_jiffies(spi->timeout); -+ do { -+ if (!hw_is_busy(spi)) -+ return 0; -+ -+ cond_resched(); -+ } while (!time_after_eq(jiffies, timeout)); -+ -+ /* flush FIFOs on timeout */ -+ rx_fifo_flush(spi); -+ tx_fifo_flush(spi); -+ -+ return -EIO; -+} -+ -+static int lantiq_spi_transfer_one_message(struct spi_master *master, -+ struct spi_message *msg) -+{ -+ struct lantiq_spi *spi = spi_master_get_devdata(master); -+ struct spi_device *spidev = msg->spi; -+ struct spi_transfer *t; -+ int status; -+ unsigned int cs_change = 1; -+ -+ hw_setup_message(spi, spidev); -+ -+ list_for_each_entry(t, &msg->transfers, transfer_list) { -+ reinit_completion(&spi->xfer_complete); -+ -+ hw_setup_transfer(spi, spidev, t); -+ -+ if (cs_change) -+ chipselect_enable(spidev); -+ cs_change = t->cs_change; -+ -+ status = transfer_start(spi, spidev, t); -+ if (status) { -+ dev_err(spi->dev, "failed to start transfer\n"); -+ goto done; -+ } -+ -+ status = transfer_wait_finished(spi); -+ if (status) { -+ dev_err(spi->dev, "transfer timeout\n"); -+ goto done; -+ } -+ -+ status = spi->status; -+ if (status) { -+ dev_err(spi->dev, "transfer failed\n"); -+ goto done; -+ } -+ -+ msg->actual_length += t->len; -+ -+ if (t->delay_usecs) -+ udelay(t->delay_usecs); -+ -+ if (cs_change) -+ chipselect_disable(spidev); -+ } -+ -+done: -+ msg->status = status; -+ -+ if (!(status == 0 && cs_change)) -+ chipselect_disable(spidev); -+ -+ spi_finalize_current_message(master); -+ hw_finish_message(spi); -+ -+ return status; -+} -+ -+static int lantiq_spi_prepare_transfer(struct spi_master *master) -+{ -+ struct lantiq_spi *spi = spi_master_get_devdata(master); -+ -+ pm_runtime_get_sync(spi->dev); -+ -+ return 0; -+} -+ -+static int lantiq_spi_unprepare_transfer(struct spi_master *master) -+{ -+ struct lantiq_spi *spi = spi_master_get_devdata(master); -+ -+ pm_runtime_put(spi->dev); -+ -+ return 0; -+} -+ -+static const struct lantiq_spi_hwcfg spi_xway = { -+ .num_chipselect = 3, -+ .irnen_r = SPI_IRNEN_R_XWAY, -+ .irnen_t = SPI_IRNEN_T_XWAY, -+}; -+ -+static const struct lantiq_spi_hwcfg spi_xrx = { -+ .num_chipselect = 6, -+ .irnen_r = SPI_IRNEN_R_XRX, -+ .irnen_t = SPI_IRNEN_T_XRX, -+}; -+ -+static const struct of_device_id lantiq_spi_match[] = { -+ { .compatible = "lantiq,spi-xway", .data = &spi_xway, }, /* DEPRECATED */ -+ { .compatible = "lantiq,ase-spi", .data = &spi_xway, }, -+ { .compatible = "lantiq,xrx100-spi", .data = &spi_xrx, }, -+ { .compatible = "lantiq,xrx200-spi", .data = &spi_xrx, }, -+ { .compatible = "lantiq,xrx330-spi", .data = &spi_xrx, }, -+ {}, -+}; -+MODULE_DEVICE_TABLE(of, lantiq_spi_match); -+ -+static int lantiq_spi_probe(struct platform_device *pdev) -+{ -+ struct spi_master *master; -+ struct resource *res; -+ struct lantiq_spi *spi; -+ const struct lantiq_spi_hwcfg *hwcfg; -+ const struct of_device_id *match; -+ int err, rx_irq, tx_irq, err_irq; -+ -+ match = of_match_device(lantiq_spi_match, &pdev->dev); -+ if (!match) { -+ dev_err(&pdev->dev, "no device match\n"); -+ return -EINVAL; -+ } -+ hwcfg = match->data; -+ -+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); -+ if (!res) { -+ dev_err(&pdev->dev, "failed to get resources\n"); -+ return -ENXIO; -+ } -+ -+ rx_irq = platform_get_irq_byname(pdev, SPI_RX_IRQ_NAME); -+ if (rx_irq < 0) { -+ dev_err(&pdev->dev, "failed to get %s\n", SPI_RX_IRQ_NAME); -+ return -ENXIO; -+ } -+ -+ tx_irq = platform_get_irq_byname(pdev, SPI_TX_IRQ_NAME); -+ if (tx_irq < 0) { -+ dev_err(&pdev->dev, "failed to get %s\n", SPI_TX_IRQ_NAME); -+ return -ENXIO; -+ } -+ -+ err_irq = platform_get_irq_byname(pdev, SPI_ERR_IRQ_NAME); -+ if (err_irq < 0) { -+ dev_err(&pdev->dev, "failed to get %s\n", SPI_ERR_IRQ_NAME); -+ return -ENXIO; -+ } -+ -+ master = spi_alloc_master(&pdev->dev, sizeof(struct lantiq_spi)); -+ if (!master) -+ return -ENOMEM; -+ -+ spi = spi_master_get_devdata(master); -+ spi->master = master; -+ spi->dev = &pdev->dev; -+ spi->hwcfg = hwcfg; -+ platform_set_drvdata(pdev, spi); -+ -+ spi->regbase = devm_ioremap_resource(&pdev->dev, res); -+ if (IS_ERR(spi->regbase)) { -+ err = PTR_ERR(spi->regbase); -+ goto err_master_put; -+ } -+ -+ err = devm_request_irq(&pdev->dev, rx_irq, lantiq_spi_xmit_interrupt, 0, -+ SPI_RX_IRQ_NAME, spi); -+ if (err) -+ goto err_master_put; -+ -+ err = devm_request_irq(&pdev->dev, tx_irq, lantiq_spi_xmit_interrupt, 0, -+ SPI_TX_IRQ_NAME, spi); -+ if (err) -+ goto err_master_put; -+ -+ err = devm_request_irq(&pdev->dev, err_irq, lantiq_spi_err_interrupt, 0, -+ SPI_ERR_IRQ_NAME, spi); -+ if (err) -+ goto err_master_put; -+ -+ spi->spi_clk = clk_get(&pdev->dev, NULL); -+ if (IS_ERR(spi->spi_clk)) { -+ err = PTR_ERR(spi->spi_clk); -+ goto err_master_put; -+ } -+ clk_prepare_enable(spi->spi_clk); -+ -+ spi->fpi_clk = clk_get_fpi(); -+ if (IS_ERR(spi->fpi_clk)) { -+ err = PTR_ERR(spi->fpi_clk); -+ goto err_clk_disable; -+ } -+ -+ init_completion(&spi->xfer_complete); -+ spin_lock_init(&spi->lock); -+ spi->timeout = 2000; -+ spi->cs_delay = 100; -+ spi->bits_per_word = 8; -+ spi->speed_hz = 0; -+ -+ master->dev.of_node = pdev->dev.of_node; -+ master->bus_num = 0; -+ master->num_chipselect = hwcfg->num_chipselect; -+ master->setup = lantiq_spi_setup; -+ master->cleanup = lantiq_spi_cleanup; -+ master->prepare_transfer_hardware = lantiq_spi_prepare_transfer; -+ master->transfer_one_message = lantiq_spi_transfer_one_message; -+ master->unprepare_transfer_hardware = lantiq_spi_unprepare_transfer; -+ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST | SPI_CS_HIGH | -+ SPI_LOOP; -+ -+ lantiq_spi_hw_init(spi); -+ -+ err = spi_register_master(master); -+ if (err) { -+ dev_err(&pdev->dev, "failed to register spi_master\n"); -+ goto err_clk_put; -+ } -+ -+ dev_info(&pdev->dev, -+ "Lantiq SPI controller (TXFS %u, RXFS %u, DMA %u)\n", -+ tx_fifo_size(spi), rx_fifo_size(spi), supports_dma(spi)); -+ -+ return 0; -+ -+err_clk_put: -+ clk_put(spi->fpi_clk); -+err_clk_disable: -+ clk_disable_unprepare(spi->spi_clk); -+ clk_put(spi->spi_clk); -+err_master_put: -+ platform_set_drvdata(pdev, NULL); -+ spi_master_put(master); -+ -+ return err; -+} -+ -+static int lantiq_spi_remove(struct platform_device *pdev) -+{ -+ struct lantiq_spi *spi = platform_get_drvdata(pdev); -+ struct spi_master *master = spi->master; -+ -+ spi_unregister_master(master); -+ -+ lantiq_spi_writel(spi, 0, SPI_IRNEN); -+ rx_fifo_flush(spi); -+ tx_fifo_flush(spi); -+ hw_enter_config_mode(spi); -+ -+ clk_disable_unprepare(spi->spi_clk); -+ clk_put(spi->spi_clk); -+ clk_put(spi->fpi_clk); -+ -+ platform_set_drvdata(pdev, NULL); -+ spi_master_put(master); -+ -+ return 0; -+} -+ -+static struct platform_driver lantiq_spi_driver = { -+ .probe = lantiq_spi_probe, -+ .remove = lantiq_spi_remove, -+ .driver = { -+ .name = "spi-lantiq", -+ .owner = THIS_MODULE, -+ .of_match_table = lantiq_spi_match, -+ }, -+}; -+module_platform_driver(lantiq_spi_driver); -+ -+MODULE_DESCRIPTION("Lantiq SPI controller driver"); -+MODULE_AUTHOR("Daniel Schwierzeck <daniel.schwierzeck@gmail.com>"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("platform:spi-lantiq"); |