// SPDX-License-Identifier: GPL-2.0+ /* * Synopsys DesignWare 8250 driver. * * Copyright 2011 Picochip, Jamie Iles. * Copyright 2013 Intel Corporation * * The Synopsys DesignWare 8250 has an extra feature whereby it detects if the * LCR is written whilst busy. If it is, then a busy detect interrupt is * raised, the LCR needs to be rewritten and the uart status register read. */ #include <linux/clk.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/io.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/notifier.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/property.h> #include <linux/reset.h> #include <linux/slab.h> #include <linux/workqueue.h> #include <asm/byteorder.h> #include <linux/serial_8250.h> #include <linux/serial_reg.h> #include "8250_dwlib.h" /* Offsets for the DesignWare specific registers */ #define DW_UART_USR … #define DW_UART_DMASA … #define OCTEON_UART_USR … #define RZN1_UART_TDMACR … #define RZN1_UART_RDMACR … /* DesignWare specific register fields */ #define DW_UART_MCR_SIRE … /* Renesas specific register fields */ #define RZN1_UART_xDMACR_DMA_EN … #define RZN1_UART_xDMACR_1_WORD_BURST … #define RZN1_UART_xDMACR_4_WORD_BURST … #define RZN1_UART_xDMACR_8_WORD_BURST … #define RZN1_UART_xDMACR_BLK_SZ(x) … /* Quirks */ #define DW_UART_QUIRK_OCTEON … #define DW_UART_QUIRK_ARMADA_38X … #define DW_UART_QUIRK_SKIP_SET_RATE … #define DW_UART_QUIRK_IS_DMA_FC … #define DW_UART_QUIRK_APMC0D08 … #define DW_UART_QUIRK_CPR_VALUE … struct dw8250_platform_data { … }; struct dw8250_data { … }; static inline struct dw8250_data *to_dw8250_data(struct dw8250_port_data *data) { … } static inline struct dw8250_data *clk_to_dw8250_data(struct notifier_block *nb) { … } static inline struct dw8250_data *work_to_dw8250_data(struct work_struct *work) { … } static inline int dw8250_modify_msr(struct uart_port *p, int offset, int value) { … } static void dw8250_force_idle(struct uart_port *p) { … } static void dw8250_check_lcr(struct uart_port *p, int offset, int value) { … } /* Returns once the transmitter is empty or we run out of retries */ static void dw8250_tx_wait_empty(struct uart_port *p) { … } static void dw8250_serial_out(struct uart_port *p, int offset, int value) { … } static void dw8250_serial_out38x(struct uart_port *p, int offset, int value) { … } static unsigned int dw8250_serial_in(struct uart_port *p, int offset) { … } #ifdef CONFIG_64BIT static unsigned int dw8250_serial_inq(struct uart_port *p, int offset) { … } static void dw8250_serial_outq(struct uart_port *p, int offset, int value) { … } #endif /* CONFIG_64BIT */ static void dw8250_serial_out32(struct uart_port *p, int offset, int value) { … } static unsigned int dw8250_serial_in32(struct uart_port *p, int offset) { … } static void dw8250_serial_out32be(struct uart_port *p, int offset, int value) { … } static unsigned int dw8250_serial_in32be(struct uart_port *p, int offset) { … } static int dw8250_handle_irq(struct uart_port *p) { … } static void dw8250_clk_work_cb(struct work_struct *work) { … } static int dw8250_clk_notifier_cb(struct notifier_block *nb, unsigned long event, void *data) { … } static void dw8250_do_pm(struct uart_port *port, unsigned int state, unsigned int old) { … } static void dw8250_set_termios(struct uart_port *p, struct ktermios *termios, const struct ktermios *old) { … } static void dw8250_set_ldisc(struct uart_port *p, struct ktermios *termios) { … } /* * dw8250_fallback_dma_filter will prevent the UART from getting just any free * channel on platforms that have DMA engines, but don't have any channels * assigned to the UART. * * REVISIT: This is a work around for limitation in the DMA Engine API. Once the * core problem is fixed, this function is no longer needed. */ static bool dw8250_fallback_dma_filter(struct dma_chan *chan, void *param) { … } static bool dw8250_idma_filter(struct dma_chan *chan, void *param) { … } static u32 dw8250_rzn1_get_dmacr_burst(int max_burst) { … } static void dw8250_prepare_tx_dma(struct uart_8250_port *p) { … } static void dw8250_prepare_rx_dma(struct uart_8250_port *p) { … } static void dw8250_quirks(struct uart_port *p, struct dw8250_data *data) { … } static void dw8250_reset_control_assert(void *data) { … } static int dw8250_probe(struct platform_device *pdev) { … } static void dw8250_remove(struct platform_device *pdev) { … } static int dw8250_suspend(struct device *dev) { … } static int dw8250_resume(struct device *dev) { … } static int dw8250_runtime_suspend(struct device *dev) { … } static int dw8250_runtime_resume(struct device *dev) { … } static const struct dev_pm_ops dw8250_pm_ops = …; static const struct dw8250_platform_data dw8250_dw_apb = …; static const struct dw8250_platform_data dw8250_octeon_3860_data = …; static const struct dw8250_platform_data dw8250_armada_38x_data = …; static const struct dw8250_platform_data dw8250_renesas_rzn1_data = …; static const struct dw8250_platform_data dw8250_starfive_jh7100_data = …; static const struct of_device_id dw8250_of_match[] = …; MODULE_DEVICE_TABLE(of, dw8250_of_match); static const struct dw8250_platform_data dw8250_apmc0d08 = …; static const struct acpi_device_id dw8250_acpi_match[] = …; MODULE_DEVICE_TABLE(acpi, dw8250_acpi_match); static struct platform_driver dw8250_platform_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …; MODULE_DESCRIPTION(…) …; MODULE_ALIAS(…) …;
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