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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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80776554b6
This patch introduces baudrate setting support via the generic clock API. When present the optional device tree clock property is used instead of fsl-cpm-brg. Platforms can then define complex clock schemes, to output the serial clock on an external pin for instance. Signed-off-by: Laurent Pinchart <laurentp@cse-semaphore.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
154 lines
3.8 KiB
C
154 lines
3.8 KiB
C
/*
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* linux/drivers/serial/cpm_uart.h
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*
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* Driver for CPM (SCC/SMC) serial ports
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*
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* Copyright (C) 2004 Freescale Semiconductor, Inc.
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*
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* 2006 (c) MontaVista Software, Inc.
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* Vitaly Bordug <vbordug@ru.mvista.com>
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*
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*/
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#ifndef CPM_UART_H
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#define CPM_UART_H
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#include <linux/platform_device.h>
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#include <linux/fs_uart_pd.h>
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#if defined(CONFIG_CPM2)
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#include "cpm_uart_cpm2.h"
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#elif defined(CONFIG_8xx)
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#include "cpm_uart_cpm1.h"
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#endif
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#define SERIAL_CPM_MAJOR 204
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#define SERIAL_CPM_MINOR 46
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#define IS_SMC(pinfo) (pinfo->flags & FLAG_SMC)
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#define IS_DISCARDING(pinfo) (pinfo->flags & FLAG_DISCARDING)
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#define FLAG_DISCARDING 0x00000004 /* when set, don't discard */
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#define FLAG_SMC 0x00000002
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#define FLAG_CONSOLE 0x00000001
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#define UART_SMC1 fsid_smc1_uart
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#define UART_SMC2 fsid_smc2_uart
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#define UART_SCC1 fsid_scc1_uart
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#define UART_SCC2 fsid_scc2_uart
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#define UART_SCC3 fsid_scc3_uart
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#define UART_SCC4 fsid_scc4_uart
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#define UART_NR fs_uart_nr
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#define RX_NUM_FIFO 4
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#define RX_BUF_SIZE 32
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#define TX_NUM_FIFO 4
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#define TX_BUF_SIZE 32
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#define SCC_WAIT_CLOSING 100
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#define GPIO_CTS 0
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#define GPIO_RTS 1
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#define GPIO_DCD 2
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#define GPIO_DSR 3
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#define GPIO_DTR 4
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#define GPIO_RI 5
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#define NUM_GPIOS (GPIO_RI+1)
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struct uart_cpm_port {
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struct uart_port port;
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u16 rx_nrfifos;
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u16 rx_fifosize;
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u16 tx_nrfifos;
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u16 tx_fifosize;
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smc_t __iomem *smcp;
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smc_uart_t __iomem *smcup;
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scc_t __iomem *sccp;
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scc_uart_t __iomem *sccup;
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cbd_t __iomem *rx_bd_base;
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cbd_t __iomem *rx_cur;
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cbd_t __iomem *tx_bd_base;
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cbd_t __iomem *tx_cur;
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unsigned char *tx_buf;
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unsigned char *rx_buf;
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u32 flags;
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void (*set_lineif)(struct uart_cpm_port *);
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struct clk *clk;
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u8 brg;
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uint dp_addr;
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void *mem_addr;
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dma_addr_t dma_addr;
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u32 mem_size;
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/* helpers */
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int baud;
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int bits;
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/* Keep track of 'odd' SMC2 wirings */
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int is_portb;
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/* wait on close if needed */
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int wait_closing;
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/* value to combine with opcode to form cpm command */
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u32 command;
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int gpios[NUM_GPIOS];
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};
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extern int cpm_uart_nr;
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extern struct uart_cpm_port cpm_uart_ports[UART_NR];
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/* these are located in their respective files */
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void cpm_line_cr_cmd(struct uart_cpm_port *port, int cmd);
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void __iomem *cpm_uart_map_pram(struct uart_cpm_port *port,
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struct device_node *np);
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void cpm_uart_unmap_pram(struct uart_cpm_port *port, void __iomem *pram);
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int cpm_uart_init_portdesc(void);
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int cpm_uart_allocbuf(struct uart_cpm_port *pinfo, unsigned int is_con);
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void cpm_uart_freebuf(struct uart_cpm_port *pinfo);
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void smc1_lineif(struct uart_cpm_port *pinfo);
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void smc2_lineif(struct uart_cpm_port *pinfo);
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void scc1_lineif(struct uart_cpm_port *pinfo);
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void scc2_lineif(struct uart_cpm_port *pinfo);
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void scc3_lineif(struct uart_cpm_port *pinfo);
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void scc4_lineif(struct uart_cpm_port *pinfo);
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/*
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virtual to phys transtalion
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*/
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static inline unsigned long cpu2cpm_addr(void *addr,
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struct uart_cpm_port *pinfo)
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{
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int offset;
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u32 val = (u32)addr;
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u32 mem = (u32)pinfo->mem_addr;
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/* sane check */
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if (likely(val >= mem && val < mem + pinfo->mem_size)) {
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offset = val - mem;
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return pinfo->dma_addr + offset;
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}
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/* something nasty happened */
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BUG();
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return 0;
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}
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static inline void *cpm2cpu_addr(unsigned long addr,
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struct uart_cpm_port *pinfo)
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{
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int offset;
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u32 val = addr;
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u32 dma = (u32)pinfo->dma_addr;
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/* sane check */
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if (likely(val >= dma && val < dma + pinfo->mem_size)) {
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offset = val - dma;
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return pinfo->mem_addr + offset;
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}
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/* something nasty happened */
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BUG();
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return NULL;
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}
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#endif /* CPM_UART_H */
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