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1919 lines
49 KiB
1919 lines
49 KiB
/* |
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* Freescale lpuart serial port driver |
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* |
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* Copyright 2012-2014 Freescale Semiconductor, Inc. |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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*/ |
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|
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#if defined(CONFIG_SERIAL_FSL_LPUART_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ) |
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#define SUPPORT_SYSRQ |
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#endif |
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#include <linux/clk.h> |
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#include <linux/console.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/dmaengine.h> |
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#include <linux/dmapool.h> |
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#include <linux/io.h> |
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#include <linux/irq.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/of_device.h> |
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#include <linux/of_dma.h> |
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#include <linux/serial_core.h> |
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#include <linux/slab.h> |
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#include <linux/tty_flip.h> |
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|
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/* All registers are 8-bit width */ |
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#define UARTBDH 0x00 |
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#define UARTBDL 0x01 |
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#define UARTCR1 0x02 |
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#define UARTCR2 0x03 |
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#define UARTSR1 0x04 |
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#define UARTCR3 0x06 |
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#define UARTDR 0x07 |
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#define UARTCR4 0x0a |
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#define UARTCR5 0x0b |
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#define UARTMODEM 0x0d |
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#define UARTPFIFO 0x10 |
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#define UARTCFIFO 0x11 |
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#define UARTSFIFO 0x12 |
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#define UARTTWFIFO 0x13 |
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#define UARTTCFIFO 0x14 |
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#define UARTRWFIFO 0x15 |
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|
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#define UARTBDH_LBKDIE 0x80 |
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#define UARTBDH_RXEDGIE 0x40 |
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#define UARTBDH_SBR_MASK 0x1f |
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#define UARTCR1_LOOPS 0x80 |
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#define UARTCR1_RSRC 0x20 |
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#define UARTCR1_M 0x10 |
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#define UARTCR1_WAKE 0x08 |
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#define UARTCR1_ILT 0x04 |
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#define UARTCR1_PE 0x02 |
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#define UARTCR1_PT 0x01 |
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#define UARTCR2_TIE 0x80 |
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#define UARTCR2_TCIE 0x40 |
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#define UARTCR2_RIE 0x20 |
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#define UARTCR2_ILIE 0x10 |
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#define UARTCR2_TE 0x08 |
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#define UARTCR2_RE 0x04 |
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#define UARTCR2_RWU 0x02 |
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#define UARTCR2_SBK 0x01 |
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#define UARTSR1_TDRE 0x80 |
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#define UARTSR1_TC 0x40 |
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#define UARTSR1_RDRF 0x20 |
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#define UARTSR1_IDLE 0x10 |
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#define UARTSR1_OR 0x08 |
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#define UARTSR1_NF 0x04 |
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#define UARTSR1_FE 0x02 |
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#define UARTSR1_PE 0x01 |
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#define UARTCR3_R8 0x80 |
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#define UARTCR3_T8 0x40 |
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#define UARTCR3_TXDIR 0x20 |
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#define UARTCR3_TXINV 0x10 |
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#define UARTCR3_ORIE 0x08 |
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#define UARTCR3_NEIE 0x04 |
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#define UARTCR3_FEIE 0x02 |
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#define UARTCR3_PEIE 0x01 |
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#define UARTCR4_MAEN1 0x80 |
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#define UARTCR4_MAEN2 0x40 |
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#define UARTCR4_M10 0x20 |
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#define UARTCR4_BRFA_MASK 0x1f |
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#define UARTCR4_BRFA_OFF 0 |
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#define UARTCR5_TDMAS 0x80 |
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#define UARTCR5_RDMAS 0x20 |
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#define UARTMODEM_RXRTSE 0x08 |
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#define UARTMODEM_TXRTSPOL 0x04 |
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#define UARTMODEM_TXRTSE 0x02 |
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#define UARTMODEM_TXCTSE 0x01 |
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#define UARTPFIFO_TXFE 0x80 |
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#define UARTPFIFO_FIFOSIZE_MASK 0x7 |
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#define UARTPFIFO_TXSIZE_OFF 4 |
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#define UARTPFIFO_RXFE 0x08 |
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#define UARTPFIFO_RXSIZE_OFF 0 |
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#define UARTCFIFO_TXFLUSH 0x80 |
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#define UARTCFIFO_RXFLUSH 0x40 |
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#define UARTCFIFO_RXOFE 0x04 |
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#define UARTCFIFO_TXOFE 0x02 |
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#define UARTCFIFO_RXUFE 0x01 |
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#define UARTSFIFO_TXEMPT 0x80 |
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#define UARTSFIFO_RXEMPT 0x40 |
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#define UARTSFIFO_RXOF 0x04 |
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#define UARTSFIFO_TXOF 0x02 |
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#define UARTSFIFO_RXUF 0x01 |
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/* 32-bit register defination */ |
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#define UARTBAUD 0x00 |
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#define UARTSTAT 0x04 |
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#define UARTCTRL 0x08 |
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#define UARTDATA 0x0C |
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#define UARTMATCH 0x10 |
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#define UARTMODIR 0x14 |
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#define UARTFIFO 0x18 |
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#define UARTWATER 0x1c |
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#define UARTBAUD_MAEN1 0x80000000 |
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#define UARTBAUD_MAEN2 0x40000000 |
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#define UARTBAUD_M10 0x20000000 |
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#define UARTBAUD_TDMAE 0x00800000 |
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#define UARTBAUD_RDMAE 0x00200000 |
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#define UARTBAUD_MATCFG 0x00400000 |
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#define UARTBAUD_BOTHEDGE 0x00020000 |
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#define UARTBAUD_RESYNCDIS 0x00010000 |
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#define UARTBAUD_LBKDIE 0x00008000 |
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#define UARTBAUD_RXEDGIE 0x00004000 |
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#define UARTBAUD_SBNS 0x00002000 |
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#define UARTBAUD_SBR 0x00000000 |
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#define UARTBAUD_SBR_MASK 0x1fff |
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#define UARTSTAT_LBKDIF 0x80000000 |
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#define UARTSTAT_RXEDGIF 0x40000000 |
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#define UARTSTAT_MSBF 0x20000000 |
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#define UARTSTAT_RXINV 0x10000000 |
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#define UARTSTAT_RWUID 0x08000000 |
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#define UARTSTAT_BRK13 0x04000000 |
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#define UARTSTAT_LBKDE 0x02000000 |
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#define UARTSTAT_RAF 0x01000000 |
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#define UARTSTAT_TDRE 0x00800000 |
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#define UARTSTAT_TC 0x00400000 |
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#define UARTSTAT_RDRF 0x00200000 |
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#define UARTSTAT_IDLE 0x00100000 |
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#define UARTSTAT_OR 0x00080000 |
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#define UARTSTAT_NF 0x00040000 |
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#define UARTSTAT_FE 0x00020000 |
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#define UARTSTAT_PE 0x00010000 |
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#define UARTSTAT_MA1F 0x00008000 |
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#define UARTSTAT_M21F 0x00004000 |
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#define UARTCTRL_R8T9 0x80000000 |
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#define UARTCTRL_R9T8 0x40000000 |
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#define UARTCTRL_TXDIR 0x20000000 |
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#define UARTCTRL_TXINV 0x10000000 |
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#define UARTCTRL_ORIE 0x08000000 |
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#define UARTCTRL_NEIE 0x04000000 |
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#define UARTCTRL_FEIE 0x02000000 |
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#define UARTCTRL_PEIE 0x01000000 |
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#define UARTCTRL_TIE 0x00800000 |
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#define UARTCTRL_TCIE 0x00400000 |
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#define UARTCTRL_RIE 0x00200000 |
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#define UARTCTRL_ILIE 0x00100000 |
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#define UARTCTRL_TE 0x00080000 |
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#define UARTCTRL_RE 0x00040000 |
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#define UARTCTRL_RWU 0x00020000 |
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#define UARTCTRL_SBK 0x00010000 |
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#define UARTCTRL_MA1IE 0x00008000 |
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#define UARTCTRL_MA2IE 0x00004000 |
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#define UARTCTRL_IDLECFG 0x00000100 |
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#define UARTCTRL_LOOPS 0x00000080 |
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#define UARTCTRL_DOZEEN 0x00000040 |
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#define UARTCTRL_RSRC 0x00000020 |
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#define UARTCTRL_M 0x00000010 |
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#define UARTCTRL_WAKE 0x00000008 |
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#define UARTCTRL_ILT 0x00000004 |
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#define UARTCTRL_PE 0x00000002 |
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#define UARTCTRL_PT 0x00000001 |
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#define UARTDATA_NOISY 0x00008000 |
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#define UARTDATA_PARITYE 0x00004000 |
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#define UARTDATA_FRETSC 0x00002000 |
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#define UARTDATA_RXEMPT 0x00001000 |
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#define UARTDATA_IDLINE 0x00000800 |
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#define UARTDATA_MASK 0x3ff |
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#define UARTMODIR_IREN 0x00020000 |
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#define UARTMODIR_TXCTSSRC 0x00000020 |
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#define UARTMODIR_TXCTSC 0x00000010 |
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#define UARTMODIR_RXRTSE 0x00000008 |
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#define UARTMODIR_TXRTSPOL 0x00000004 |
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#define UARTMODIR_TXRTSE 0x00000002 |
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#define UARTMODIR_TXCTSE 0x00000001 |
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#define UARTFIFO_TXEMPT 0x00800000 |
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#define UARTFIFO_RXEMPT 0x00400000 |
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#define UARTFIFO_TXOF 0x00020000 |
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#define UARTFIFO_RXUF 0x00010000 |
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#define UARTFIFO_TXFLUSH 0x00008000 |
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#define UARTFIFO_RXFLUSH 0x00004000 |
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#define UARTFIFO_TXOFE 0x00000200 |
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#define UARTFIFO_RXUFE 0x00000100 |
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#define UARTFIFO_TXFE 0x00000080 |
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#define UARTFIFO_FIFOSIZE_MASK 0x7 |
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#define UARTFIFO_TXSIZE_OFF 4 |
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#define UARTFIFO_RXFE 0x00000008 |
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#define UARTFIFO_RXSIZE_OFF 0 |
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#define UARTWATER_COUNT_MASK 0xff |
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#define UARTWATER_TXCNT_OFF 8 |
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#define UARTWATER_RXCNT_OFF 24 |
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#define UARTWATER_WATER_MASK 0xff |
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#define UARTWATER_TXWATER_OFF 0 |
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#define UARTWATER_RXWATER_OFF 16 |
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#define FSL_UART_RX_DMA_BUFFER_SIZE 64 |
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#define DRIVER_NAME "fsl-lpuart" |
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#define DEV_NAME "ttyLP" |
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#define UART_NR 6 |
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struct lpuart_port { |
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struct uart_port port; |
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struct clk *clk; |
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unsigned int txfifo_size; |
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unsigned int rxfifo_size; |
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bool lpuart32; |
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bool lpuart_dma_use; |
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struct dma_chan *dma_tx_chan; |
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struct dma_chan *dma_rx_chan; |
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struct dma_async_tx_descriptor *dma_tx_desc; |
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struct dma_async_tx_descriptor *dma_rx_desc; |
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dma_addr_t dma_tx_buf_bus; |
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dma_addr_t dma_rx_buf_bus; |
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dma_cookie_t dma_tx_cookie; |
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dma_cookie_t dma_rx_cookie; |
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unsigned char *dma_tx_buf_virt; |
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unsigned char *dma_rx_buf_virt; |
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unsigned int dma_tx_bytes; |
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unsigned int dma_rx_bytes; |
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int dma_tx_in_progress; |
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int dma_rx_in_progress; |
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unsigned int dma_rx_timeout; |
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struct timer_list lpuart_timer; |
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}; |
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static struct of_device_id lpuart_dt_ids[] = { |
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{ |
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.compatible = "fsl,vf610-lpuart", |
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}, |
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{ |
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.compatible = "fsl,ls1021a-lpuart", |
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}, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(of, lpuart_dt_ids); |
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/* Forward declare this for the dma callbacks*/ |
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static void lpuart_dma_tx_complete(void *arg); |
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static void lpuart_dma_rx_complete(void *arg); |
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static u32 lpuart32_read(void __iomem *addr) |
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{ |
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return ioread32be(addr); |
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} |
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static void lpuart32_write(u32 val, void __iomem *addr) |
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{ |
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iowrite32be(val, addr); |
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} |
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static void lpuart_stop_tx(struct uart_port *port) |
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{ |
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unsigned char temp; |
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temp = readb(port->membase + UARTCR2); |
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temp &= ~(UARTCR2_TIE | UARTCR2_TCIE); |
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writeb(temp, port->membase + UARTCR2); |
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} |
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static void lpuart32_stop_tx(struct uart_port *port) |
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{ |
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unsigned long temp; |
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temp = lpuart32_read(port->membase + UARTCTRL); |
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temp &= ~(UARTCTRL_TIE | UARTCTRL_TCIE); |
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lpuart32_write(temp, port->membase + UARTCTRL); |
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} |
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static void lpuart_stop_rx(struct uart_port *port) |
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{ |
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unsigned char temp; |
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temp = readb(port->membase + UARTCR2); |
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writeb(temp & ~UARTCR2_RE, port->membase + UARTCR2); |
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} |
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static void lpuart32_stop_rx(struct uart_port *port) |
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{ |
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unsigned long temp; |
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temp = lpuart32_read(port->membase + UARTCTRL); |
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lpuart32_write(temp & ~UARTCTRL_RE, port->membase + UARTCTRL); |
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} |
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static void lpuart_copy_rx_to_tty(struct lpuart_port *sport, |
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struct tty_port *tty, int count) |
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{ |
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int copied; |
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sport->port.icount.rx += count; |
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if (!tty) { |
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dev_err(sport->port.dev, "No tty port\n"); |
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return; |
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} |
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dma_sync_single_for_cpu(sport->port.dev, sport->dma_rx_buf_bus, |
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FSL_UART_RX_DMA_BUFFER_SIZE, DMA_FROM_DEVICE); |
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copied = tty_insert_flip_string(tty, |
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((unsigned char *)(sport->dma_rx_buf_virt)), count); |
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if (copied != count) { |
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WARN_ON(1); |
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dev_err(sport->port.dev, "RxData copy to tty layer failed\n"); |
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} |
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dma_sync_single_for_device(sport->port.dev, sport->dma_rx_buf_bus, |
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FSL_UART_RX_DMA_BUFFER_SIZE, DMA_TO_DEVICE); |
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} |
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static void lpuart_pio_tx(struct lpuart_port *sport) |
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{ |
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struct circ_buf *xmit = &sport->port.state->xmit; |
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unsigned long flags; |
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spin_lock_irqsave(&sport->port.lock, flags); |
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while (!uart_circ_empty(xmit) && |
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readb(sport->port.membase + UARTTCFIFO) < sport->txfifo_size) { |
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writeb(xmit->buf[xmit->tail], sport->port.membase + UARTDR); |
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xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
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sport->port.icount.tx++; |
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} |
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if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
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uart_write_wakeup(&sport->port); |
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if (uart_circ_empty(xmit)) |
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writeb(readb(sport->port.membase + UARTCR5) | UARTCR5_TDMAS, |
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sport->port.membase + UARTCR5); |
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spin_unlock_irqrestore(&sport->port.lock, flags); |
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} |
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static int lpuart_dma_tx(struct lpuart_port *sport, unsigned long count) |
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{ |
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struct circ_buf *xmit = &sport->port.state->xmit; |
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dma_addr_t tx_bus_addr; |
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dma_sync_single_for_device(sport->port.dev, sport->dma_tx_buf_bus, |
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UART_XMIT_SIZE, DMA_TO_DEVICE); |
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sport->dma_tx_bytes = count & ~(sport->txfifo_size - 1); |
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tx_bus_addr = sport->dma_tx_buf_bus + xmit->tail; |
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sport->dma_tx_desc = dmaengine_prep_slave_single(sport->dma_tx_chan, |
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tx_bus_addr, sport->dma_tx_bytes, |
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DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT); |
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if (!sport->dma_tx_desc) { |
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dev_err(sport->port.dev, "Not able to get desc for tx\n"); |
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return -EIO; |
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} |
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sport->dma_tx_desc->callback = lpuart_dma_tx_complete; |
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sport->dma_tx_desc->callback_param = sport; |
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sport->dma_tx_in_progress = 1; |
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sport->dma_tx_cookie = dmaengine_submit(sport->dma_tx_desc); |
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dma_async_issue_pending(sport->dma_tx_chan); |
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return 0; |
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} |
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static void lpuart_prepare_tx(struct lpuart_port *sport) |
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{ |
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struct circ_buf *xmit = &sport->port.state->xmit; |
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unsigned long count = CIRC_CNT_TO_END(xmit->head, |
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xmit->tail, UART_XMIT_SIZE); |
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if (!count) |
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return; |
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if (count < sport->txfifo_size) |
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writeb(readb(sport->port.membase + UARTCR5) & ~UARTCR5_TDMAS, |
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sport->port.membase + UARTCR5); |
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else { |
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writeb(readb(sport->port.membase + UARTCR5) | UARTCR5_TDMAS, |
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sport->port.membase + UARTCR5); |
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lpuart_dma_tx(sport, count); |
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} |
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} |
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static void lpuart_dma_tx_complete(void *arg) |
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{ |
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struct lpuart_port *sport = arg; |
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struct circ_buf *xmit = &sport->port.state->xmit; |
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unsigned long flags; |
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async_tx_ack(sport->dma_tx_desc); |
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spin_lock_irqsave(&sport->port.lock, flags); |
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xmit->tail = (xmit->tail + sport->dma_tx_bytes) & (UART_XMIT_SIZE - 1); |
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sport->dma_tx_in_progress = 0; |
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if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
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uart_write_wakeup(&sport->port); |
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lpuart_prepare_tx(sport); |
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spin_unlock_irqrestore(&sport->port.lock, flags); |
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} |
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static int lpuart_dma_rx(struct lpuart_port *sport) |
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{ |
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dma_sync_single_for_device(sport->port.dev, sport->dma_rx_buf_bus, |
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FSL_UART_RX_DMA_BUFFER_SIZE, DMA_TO_DEVICE); |
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sport->dma_rx_desc = dmaengine_prep_slave_single(sport->dma_rx_chan, |
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sport->dma_rx_buf_bus, FSL_UART_RX_DMA_BUFFER_SIZE, |
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DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT); |
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if (!sport->dma_rx_desc) { |
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dev_err(sport->port.dev, "Not able to get desc for rx\n"); |
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return -EIO; |
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} |
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sport->dma_rx_desc->callback = lpuart_dma_rx_complete; |
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sport->dma_rx_desc->callback_param = sport; |
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sport->dma_rx_in_progress = 1; |
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sport->dma_rx_cookie = dmaengine_submit(sport->dma_rx_desc); |
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dma_async_issue_pending(sport->dma_rx_chan); |
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return 0; |
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} |
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static void lpuart_dma_rx_complete(void *arg) |
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{ |
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struct lpuart_port *sport = arg; |
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struct tty_port *port = &sport->port.state->port; |
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unsigned long flags; |
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async_tx_ack(sport->dma_rx_desc); |
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spin_lock_irqsave(&sport->port.lock, flags); |
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sport->dma_rx_in_progress = 0; |
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lpuart_copy_rx_to_tty(sport, port, FSL_UART_RX_DMA_BUFFER_SIZE); |
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tty_flip_buffer_push(port); |
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lpuart_dma_rx(sport); |
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spin_unlock_irqrestore(&sport->port.lock, flags); |
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} |
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|
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static void lpuart_timer_func(unsigned long data) |
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{ |
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struct lpuart_port *sport = (struct lpuart_port *)data; |
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struct tty_port *port = &sport->port.state->port; |
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struct dma_tx_state state; |
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unsigned long flags; |
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unsigned char temp; |
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int count; |
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del_timer(&sport->lpuart_timer); |
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dmaengine_pause(sport->dma_rx_chan); |
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dmaengine_tx_status(sport->dma_rx_chan, sport->dma_rx_cookie, &state); |
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dmaengine_terminate_all(sport->dma_rx_chan); |
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count = FSL_UART_RX_DMA_BUFFER_SIZE - state.residue; |
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async_tx_ack(sport->dma_rx_desc); |
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spin_lock_irqsave(&sport->port.lock, flags); |
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sport->dma_rx_in_progress = 0; |
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lpuart_copy_rx_to_tty(sport, port, count); |
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tty_flip_buffer_push(port); |
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temp = readb(sport->port.membase + UARTCR5); |
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writeb(temp & ~UARTCR5_RDMAS, sport->port.membase + UARTCR5); |
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|
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spin_unlock_irqrestore(&sport->port.lock, flags); |
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} |
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|
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static inline void lpuart_prepare_rx(struct lpuart_port *sport) |
|
{ |
|
unsigned long flags; |
|
unsigned char temp; |
|
|
|
spin_lock_irqsave(&sport->port.lock, flags); |
|
|
|
sport->lpuart_timer.expires = jiffies + sport->dma_rx_timeout; |
|
add_timer(&sport->lpuart_timer); |
|
|
|
lpuart_dma_rx(sport); |
|
temp = readb(sport->port.membase + UARTCR5); |
|
writeb(temp | UARTCR5_RDMAS, sport->port.membase + UARTCR5); |
|
|
|
spin_unlock_irqrestore(&sport->port.lock, flags); |
|
} |
|
|
|
static inline void lpuart_transmit_buffer(struct lpuart_port *sport) |
|
{ |
|
struct circ_buf *xmit = &sport->port.state->xmit; |
|
|
|
while (!uart_circ_empty(xmit) && |
|
(readb(sport->port.membase + UARTTCFIFO) < sport->txfifo_size)) { |
|
writeb(xmit->buf[xmit->tail], sport->port.membase + UARTDR); |
|
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
|
sport->port.icount.tx++; |
|
} |
|
|
|
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
|
uart_write_wakeup(&sport->port); |
|
|
|
if (uart_circ_empty(xmit)) |
|
lpuart_stop_tx(&sport->port); |
|
} |
|
|
|
static inline void lpuart32_transmit_buffer(struct lpuart_port *sport) |
|
{ |
|
struct circ_buf *xmit = &sport->port.state->xmit; |
|
unsigned long txcnt; |
|
|
|
txcnt = lpuart32_read(sport->port.membase + UARTWATER); |
|
txcnt = txcnt >> UARTWATER_TXCNT_OFF; |
|
txcnt &= UARTWATER_COUNT_MASK; |
|
while (!uart_circ_empty(xmit) && (txcnt < sport->txfifo_size)) { |
|
lpuart32_write(xmit->buf[xmit->tail], sport->port.membase + UARTDATA); |
|
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
|
sport->port.icount.tx++; |
|
txcnt = lpuart32_read(sport->port.membase + UARTWATER); |
|
txcnt = txcnt >> UARTWATER_TXCNT_OFF; |
|
txcnt &= UARTWATER_COUNT_MASK; |
|
} |
|
|
|
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
|
uart_write_wakeup(&sport->port); |
|
|
|
if (uart_circ_empty(xmit)) |
|
lpuart32_stop_tx(&sport->port); |
|
} |
|
|
|
static void lpuart_start_tx(struct uart_port *port) |
|
{ |
|
struct lpuart_port *sport = container_of(port, |
|
struct lpuart_port, port); |
|
struct circ_buf *xmit = &sport->port.state->xmit; |
|
unsigned char temp; |
|
|
|
temp = readb(port->membase + UARTCR2); |
|
writeb(temp | UARTCR2_TIE, port->membase + UARTCR2); |
|
|
|
if (sport->lpuart_dma_use) { |
|
if (!uart_circ_empty(xmit) && !sport->dma_tx_in_progress) |
|
lpuart_prepare_tx(sport); |
|
} else { |
|
if (readb(port->membase + UARTSR1) & UARTSR1_TDRE) |
|
lpuart_transmit_buffer(sport); |
|
} |
|
} |
|
|
|
static void lpuart32_start_tx(struct uart_port *port) |
|
{ |
|
struct lpuart_port *sport = container_of(port, struct lpuart_port, port); |
|
unsigned long temp; |
|
|
|
temp = lpuart32_read(port->membase + UARTCTRL); |
|
lpuart32_write(temp | UARTCTRL_TIE, port->membase + UARTCTRL); |
|
|
|
if (lpuart32_read(port->membase + UARTSTAT) & UARTSTAT_TDRE) |
|
lpuart32_transmit_buffer(sport); |
|
} |
|
|
|
static irqreturn_t lpuart_txint(int irq, void *dev_id) |
|
{ |
|
struct lpuart_port *sport = dev_id; |
|
struct circ_buf *xmit = &sport->port.state->xmit; |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&sport->port.lock, flags); |
|
if (sport->port.x_char) { |
|
if (sport->lpuart32) |
|
lpuart32_write(sport->port.x_char, sport->port.membase + UARTDATA); |
|
else |
|
writeb(sport->port.x_char, sport->port.membase + UARTDR); |
|
goto out; |
|
} |
|
|
|
if (uart_circ_empty(xmit) || uart_tx_stopped(&sport->port)) { |
|
if (sport->lpuart32) |
|
lpuart32_stop_tx(&sport->port); |
|
else |
|
lpuart_stop_tx(&sport->port); |
|
goto out; |
|
} |
|
|
|
if (sport->lpuart32) |
|
lpuart32_transmit_buffer(sport); |
|
else |
|
lpuart_transmit_buffer(sport); |
|
|
|
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
|
uart_write_wakeup(&sport->port); |
|
|
|
out: |
|
spin_unlock_irqrestore(&sport->port.lock, flags); |
|
return IRQ_HANDLED; |
|
} |
|
|
|
static irqreturn_t lpuart_rxint(int irq, void *dev_id) |
|
{ |
|
struct lpuart_port *sport = dev_id; |
|
unsigned int flg, ignored = 0; |
|
struct tty_port *port = &sport->port.state->port; |
|
unsigned long flags; |
|
unsigned char rx, sr; |
|
|
|
spin_lock_irqsave(&sport->port.lock, flags); |
|
|
|
while (!(readb(sport->port.membase + UARTSFIFO) & UARTSFIFO_RXEMPT)) { |
|
flg = TTY_NORMAL; |
|
sport->port.icount.rx++; |
|
/* |
|
* to clear the FE, OR, NF, FE, PE flags, |
|
* read SR1 then read DR |
|
*/ |
|
sr = readb(sport->port.membase + UARTSR1); |
|
rx = readb(sport->port.membase + UARTDR); |
|
|
|
if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx)) |
|
continue; |
|
|
|
if (sr & (UARTSR1_PE | UARTSR1_OR | UARTSR1_FE)) { |
|
if (sr & UARTSR1_PE) |
|
sport->port.icount.parity++; |
|
else if (sr & UARTSR1_FE) |
|
sport->port.icount.frame++; |
|
|
|
if (sr & UARTSR1_OR) |
|
sport->port.icount.overrun++; |
|
|
|
if (sr & sport->port.ignore_status_mask) { |
|
if (++ignored > 100) |
|
goto out; |
|
continue; |
|
} |
|
|
|
sr &= sport->port.read_status_mask; |
|
|
|
if (sr & UARTSR1_PE) |
|
flg = TTY_PARITY; |
|
else if (sr & UARTSR1_FE) |
|
flg = TTY_FRAME; |
|
|
|
if (sr & UARTSR1_OR) |
|
flg = TTY_OVERRUN; |
|
|
|
#ifdef SUPPORT_SYSRQ |
|
sport->port.sysrq = 0; |
|
#endif |
|
} |
|
|
|
tty_insert_flip_char(port, rx, flg); |
|
} |
|
|
|
out: |
|
spin_unlock_irqrestore(&sport->port.lock, flags); |
|
|
|
tty_flip_buffer_push(port); |
|
return IRQ_HANDLED; |
|
} |
|
|
|
static irqreturn_t lpuart32_rxint(int irq, void *dev_id) |
|
{ |
|
struct lpuart_port *sport = dev_id; |
|
unsigned int flg, ignored = 0; |
|
struct tty_port *port = &sport->port.state->port; |
|
unsigned long flags; |
|
unsigned long rx, sr; |
|
|
|
spin_lock_irqsave(&sport->port.lock, flags); |
|
|
|
while (!(lpuart32_read(sport->port.membase + UARTFIFO) & UARTFIFO_RXEMPT)) { |
|
flg = TTY_NORMAL; |
|
sport->port.icount.rx++; |
|
/* |
|
* to clear the FE, OR, NF, FE, PE flags, |
|
* read STAT then read DATA reg |
|
*/ |
|
sr = lpuart32_read(sport->port.membase + UARTSTAT); |
|
rx = lpuart32_read(sport->port.membase + UARTDATA); |
|
rx &= 0x3ff; |
|
|
|
if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx)) |
|
continue; |
|
|
|
if (sr & (UARTSTAT_PE | UARTSTAT_OR | UARTSTAT_FE)) { |
|
if (sr & UARTSTAT_PE) |
|
sport->port.icount.parity++; |
|
else if (sr & UARTSTAT_FE) |
|
sport->port.icount.frame++; |
|
|
|
if (sr & UARTSTAT_OR) |
|
sport->port.icount.overrun++; |
|
|
|
if (sr & sport->port.ignore_status_mask) { |
|
if (++ignored > 100) |
|
goto out; |
|
continue; |
|
} |
|
|
|
sr &= sport->port.read_status_mask; |
|
|
|
if (sr & UARTSTAT_PE) |
|
flg = TTY_PARITY; |
|
else if (sr & UARTSTAT_FE) |
|
flg = TTY_FRAME; |
|
|
|
if (sr & UARTSTAT_OR) |
|
flg = TTY_OVERRUN; |
|
|
|
#ifdef SUPPORT_SYSRQ |
|
sport->port.sysrq = 0; |
|
#endif |
|
} |
|
|
|
tty_insert_flip_char(port, rx, flg); |
|
} |
|
|
|
out: |
|
spin_unlock_irqrestore(&sport->port.lock, flags); |
|
|
|
tty_flip_buffer_push(port); |
|
return IRQ_HANDLED; |
|
} |
|
|
|
static irqreturn_t lpuart_int(int irq, void *dev_id) |
|
{ |
|
struct lpuart_port *sport = dev_id; |
|
unsigned char sts, crdma; |
|
|
|
sts = readb(sport->port.membase + UARTSR1); |
|
crdma = readb(sport->port.membase + UARTCR5); |
|
|
|
if (sts & UARTSR1_RDRF && !(crdma & UARTCR5_RDMAS)) { |
|
if (sport->lpuart_dma_use) |
|
lpuart_prepare_rx(sport); |
|
else |
|
lpuart_rxint(irq, dev_id); |
|
} |
|
if (sts & UARTSR1_TDRE && !(crdma & UARTCR5_TDMAS)) { |
|
if (sport->lpuart_dma_use) |
|
lpuart_pio_tx(sport); |
|
else |
|
lpuart_txint(irq, dev_id); |
|
} |
|
|
|
return IRQ_HANDLED; |
|
} |
|
|
|
static irqreturn_t lpuart32_int(int irq, void *dev_id) |
|
{ |
|
struct lpuart_port *sport = dev_id; |
|
unsigned long sts, rxcount; |
|
|
|
sts = lpuart32_read(sport->port.membase + UARTSTAT); |
|
rxcount = lpuart32_read(sport->port.membase + UARTWATER); |
|
rxcount = rxcount >> UARTWATER_RXCNT_OFF; |
|
|
|
if (sts & UARTSTAT_RDRF || rxcount > 0) |
|
lpuart32_rxint(irq, dev_id); |
|
|
|
if ((sts & UARTSTAT_TDRE) && |
|
!(lpuart32_read(sport->port.membase + UARTBAUD) & UARTBAUD_TDMAE)) |
|
lpuart_txint(irq, dev_id); |
|
|
|
lpuart32_write(sts, sport->port.membase + UARTSTAT); |
|
return IRQ_HANDLED; |
|
} |
|
|
|
/* return TIOCSER_TEMT when transmitter is not busy */ |
|
static unsigned int lpuart_tx_empty(struct uart_port *port) |
|
{ |
|
return (readb(port->membase + UARTSR1) & UARTSR1_TC) ? |
|
TIOCSER_TEMT : 0; |
|
} |
|
|
|
static unsigned int lpuart32_tx_empty(struct uart_port *port) |
|
{ |
|
return (lpuart32_read(port->membase + UARTSTAT) & UARTSTAT_TC) ? |
|
TIOCSER_TEMT : 0; |
|
} |
|
|
|
static unsigned int lpuart_get_mctrl(struct uart_port *port) |
|
{ |
|
unsigned int temp = 0; |
|
unsigned char reg; |
|
|
|
reg = readb(port->membase + UARTMODEM); |
|
if (reg & UARTMODEM_TXCTSE) |
|
temp |= TIOCM_CTS; |
|
|
|
if (reg & UARTMODEM_RXRTSE) |
|
temp |= TIOCM_RTS; |
|
|
|
return temp; |
|
} |
|
|
|
static unsigned int lpuart32_get_mctrl(struct uart_port *port) |
|
{ |
|
unsigned int temp = 0; |
|
unsigned long reg; |
|
|
|
reg = lpuart32_read(port->membase + UARTMODIR); |
|
if (reg & UARTMODIR_TXCTSE) |
|
temp |= TIOCM_CTS; |
|
|
|
if (reg & UARTMODIR_RXRTSE) |
|
temp |= TIOCM_RTS; |
|
|
|
return temp; |
|
} |
|
|
|
static void lpuart_set_mctrl(struct uart_port *port, unsigned int mctrl) |
|
{ |
|
unsigned char temp; |
|
|
|
temp = readb(port->membase + UARTMODEM) & |
|
~(UARTMODEM_RXRTSE | UARTMODEM_TXCTSE); |
|
|
|
if (mctrl & TIOCM_RTS) |
|
temp |= UARTMODEM_RXRTSE; |
|
|
|
if (mctrl & TIOCM_CTS) |
|
temp |= UARTMODEM_TXCTSE; |
|
|
|
writeb(temp, port->membase + UARTMODEM); |
|
} |
|
|
|
static void lpuart32_set_mctrl(struct uart_port *port, unsigned int mctrl) |
|
{ |
|
unsigned long temp; |
|
|
|
temp = lpuart32_read(port->membase + UARTMODIR) & |
|
~(UARTMODIR_RXRTSE | UARTMODIR_TXCTSE); |
|
|
|
if (mctrl & TIOCM_RTS) |
|
temp |= UARTMODIR_RXRTSE; |
|
|
|
if (mctrl & TIOCM_CTS) |
|
temp |= UARTMODIR_TXCTSE; |
|
|
|
lpuart32_write(temp, port->membase + UARTMODIR); |
|
} |
|
|
|
static void lpuart_break_ctl(struct uart_port *port, int break_state) |
|
{ |
|
unsigned char temp; |
|
|
|
temp = readb(port->membase + UARTCR2) & ~UARTCR2_SBK; |
|
|
|
if (break_state != 0) |
|
temp |= UARTCR2_SBK; |
|
|
|
writeb(temp, port->membase + UARTCR2); |
|
} |
|
|
|
static void lpuart32_break_ctl(struct uart_port *port, int break_state) |
|
{ |
|
unsigned long temp; |
|
|
|
temp = lpuart32_read(port->membase + UARTCTRL) & ~UARTCTRL_SBK; |
|
|
|
if (break_state != 0) |
|
temp |= UARTCTRL_SBK; |
|
|
|
lpuart32_write(temp, port->membase + UARTCTRL); |
|
} |
|
|
|
static void lpuart_setup_watermark(struct lpuart_port *sport) |
|
{ |
|
unsigned char val, cr2; |
|
unsigned char cr2_saved; |
|
|
|
cr2 = readb(sport->port.membase + UARTCR2); |
|
cr2_saved = cr2; |
|
cr2 &= ~(UARTCR2_TIE | UARTCR2_TCIE | UARTCR2_TE | |
|
UARTCR2_RIE | UARTCR2_RE); |
|
writeb(cr2, sport->port.membase + UARTCR2); |
|
|
|
val = readb(sport->port.membase + UARTPFIFO); |
|
writeb(val | UARTPFIFO_TXFE | UARTPFIFO_RXFE, |
|
sport->port.membase + UARTPFIFO); |
|
|
|
/* explicitly clear RDRF */ |
|
readb(sport->port.membase + UARTSR1); |
|
|
|
/* flush Tx and Rx FIFO */ |
|
writeb(UARTCFIFO_TXFLUSH | UARTCFIFO_RXFLUSH, |
|
sport->port.membase + UARTCFIFO); |
|
|
|
writeb(0, sport->port.membase + UARTTWFIFO); |
|
writeb(1, sport->port.membase + UARTRWFIFO); |
|
|
|
/* Restore cr2 */ |
|
writeb(cr2_saved, sport->port.membase + UARTCR2); |
|
} |
|
|
|
static void lpuart32_setup_watermark(struct lpuart_port *sport) |
|
{ |
|
unsigned long val, ctrl; |
|
unsigned long ctrl_saved; |
|
|
|
ctrl = lpuart32_read(sport->port.membase + UARTCTRL); |
|
ctrl_saved = ctrl; |
|
ctrl &= ~(UARTCTRL_TIE | UARTCTRL_TCIE | UARTCTRL_TE | |
|
UARTCTRL_RIE | UARTCTRL_RE); |
|
lpuart32_write(ctrl, sport->port.membase + UARTCTRL); |
|
|
|
/* enable FIFO mode */ |
|
val = lpuart32_read(sport->port.membase + UARTFIFO); |
|
val |= UARTFIFO_TXFE | UARTFIFO_RXFE; |
|
val |= UARTFIFO_TXFLUSH | UARTFIFO_RXFLUSH; |
|
lpuart32_write(val, sport->port.membase + UARTFIFO); |
|
|
|
/* set the watermark */ |
|
val = (0x1 << UARTWATER_RXWATER_OFF) | (0x0 << UARTWATER_TXWATER_OFF); |
|
lpuart32_write(val, sport->port.membase + UARTWATER); |
|
|
|
/* Restore cr2 */ |
|
lpuart32_write(ctrl_saved, sport->port.membase + UARTCTRL); |
|
} |
|
|
|
static int lpuart_dma_tx_request(struct uart_port *port) |
|
{ |
|
struct lpuart_port *sport = container_of(port, |
|
struct lpuart_port, port); |
|
struct dma_chan *tx_chan; |
|
struct dma_slave_config dma_tx_sconfig; |
|
dma_addr_t dma_bus; |
|
unsigned char *dma_buf; |
|
int ret; |
|
|
|
tx_chan = dma_request_slave_channel(sport->port.dev, "tx"); |
|
|
|
if (!tx_chan) { |
|
dev_err(sport->port.dev, "Dma tx channel request failed!\n"); |
|
return -ENODEV; |
|
} |
|
|
|
dma_bus = dma_map_single(tx_chan->device->dev, |
|
sport->port.state->xmit.buf, |
|
UART_XMIT_SIZE, DMA_TO_DEVICE); |
|
|
|
if (dma_mapping_error(tx_chan->device->dev, dma_bus)) { |
|
dev_err(sport->port.dev, "dma_map_single tx failed\n"); |
|
dma_release_channel(tx_chan); |
|
return -ENOMEM; |
|
} |
|
|
|
dma_buf = sport->port.state->xmit.buf; |
|
dma_tx_sconfig.dst_addr = sport->port.mapbase + UARTDR; |
|
dma_tx_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; |
|
dma_tx_sconfig.dst_maxburst = sport->txfifo_size; |
|
dma_tx_sconfig.direction = DMA_MEM_TO_DEV; |
|
ret = dmaengine_slave_config(tx_chan, &dma_tx_sconfig); |
|
|
|
if (ret < 0) { |
|
dev_err(sport->port.dev, |
|
"Dma slave config failed, err = %d\n", ret); |
|
dma_release_channel(tx_chan); |
|
return ret; |
|
} |
|
|
|
sport->dma_tx_chan = tx_chan; |
|
sport->dma_tx_buf_virt = dma_buf; |
|
sport->dma_tx_buf_bus = dma_bus; |
|
sport->dma_tx_in_progress = 0; |
|
|
|
return 0; |
|
} |
|
|
|
static int lpuart_dma_rx_request(struct uart_port *port) |
|
{ |
|
struct lpuart_port *sport = container_of(port, |
|
struct lpuart_port, port); |
|
struct dma_chan *rx_chan; |
|
struct dma_slave_config dma_rx_sconfig; |
|
dma_addr_t dma_bus; |
|
unsigned char *dma_buf; |
|
int ret; |
|
|
|
rx_chan = dma_request_slave_channel(sport->port.dev, "rx"); |
|
|
|
if (!rx_chan) { |
|
dev_err(sport->port.dev, "Dma rx channel request failed!\n"); |
|
return -ENODEV; |
|
} |
|
|
|
dma_buf = devm_kzalloc(sport->port.dev, |
|
FSL_UART_RX_DMA_BUFFER_SIZE, GFP_KERNEL); |
|
|
|
if (!dma_buf) { |
|
dev_err(sport->port.dev, "Dma rx alloc failed\n"); |
|
dma_release_channel(rx_chan); |
|
return -ENOMEM; |
|
} |
|
|
|
dma_bus = dma_map_single(rx_chan->device->dev, dma_buf, |
|
FSL_UART_RX_DMA_BUFFER_SIZE, DMA_FROM_DEVICE); |
|
|
|
if (dma_mapping_error(rx_chan->device->dev, dma_bus)) { |
|
dev_err(sport->port.dev, "dma_map_single rx failed\n"); |
|
dma_release_channel(rx_chan); |
|
return -ENOMEM; |
|
} |
|
|
|
dma_rx_sconfig.src_addr = sport->port.mapbase + UARTDR; |
|
dma_rx_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; |
|
dma_rx_sconfig.src_maxburst = 1; |
|
dma_rx_sconfig.direction = DMA_DEV_TO_MEM; |
|
ret = dmaengine_slave_config(rx_chan, &dma_rx_sconfig); |
|
|
|
if (ret < 0) { |
|
dev_err(sport->port.dev, |
|
"Dma slave config failed, err = %d\n", ret); |
|
dma_release_channel(rx_chan); |
|
return ret; |
|
} |
|
|
|
sport->dma_rx_chan = rx_chan; |
|
sport->dma_rx_buf_virt = dma_buf; |
|
sport->dma_rx_buf_bus = dma_bus; |
|
sport->dma_rx_in_progress = 0; |
|
|
|
return 0; |
|
} |
|
|
|
static void lpuart_dma_tx_free(struct uart_port *port) |
|
{ |
|
struct lpuart_port *sport = container_of(port, |
|
struct lpuart_port, port); |
|
struct dma_chan *dma_chan; |
|
|
|
dma_unmap_single(sport->port.dev, sport->dma_tx_buf_bus, |
|
UART_XMIT_SIZE, DMA_TO_DEVICE); |
|
dma_chan = sport->dma_tx_chan; |
|
sport->dma_tx_chan = NULL; |
|
sport->dma_tx_buf_bus = 0; |
|
sport->dma_tx_buf_virt = NULL; |
|
dma_release_channel(dma_chan); |
|
} |
|
|
|
static void lpuart_dma_rx_free(struct uart_port *port) |
|
{ |
|
struct lpuart_port *sport = container_of(port, |
|
struct lpuart_port, port); |
|
struct dma_chan *dma_chan; |
|
|
|
dma_unmap_single(sport->port.dev, sport->dma_rx_buf_bus, |
|
FSL_UART_RX_DMA_BUFFER_SIZE, DMA_FROM_DEVICE); |
|
|
|
dma_chan = sport->dma_rx_chan; |
|
sport->dma_rx_chan = NULL; |
|
sport->dma_rx_buf_bus = 0; |
|
sport->dma_rx_buf_virt = NULL; |
|
dma_release_channel(dma_chan); |
|
} |
|
|
|
static int lpuart_startup(struct uart_port *port) |
|
{ |
|
struct lpuart_port *sport = container_of(port, struct lpuart_port, port); |
|
int ret; |
|
unsigned long flags; |
|
unsigned char temp; |
|
|
|
/* determine FIFO size and enable FIFO mode */ |
|
temp = readb(sport->port.membase + UARTPFIFO); |
|
|
|
sport->txfifo_size = 0x1 << (((temp >> UARTPFIFO_TXSIZE_OFF) & |
|
UARTPFIFO_FIFOSIZE_MASK) + 1); |
|
|
|
sport->port.fifosize = sport->txfifo_size; |
|
|
|
sport->rxfifo_size = 0x1 << (((temp >> UARTPFIFO_RXSIZE_OFF) & |
|
UARTPFIFO_FIFOSIZE_MASK) + 1); |
|
|
|
/* Whether use dma support by dma request results */ |
|
if (lpuart_dma_tx_request(port) || lpuart_dma_rx_request(port)) { |
|
sport->lpuart_dma_use = false; |
|
} else { |
|
sport->lpuart_dma_use = true; |
|
setup_timer(&sport->lpuart_timer, lpuart_timer_func, |
|
(unsigned long)sport); |
|
temp = readb(port->membase + UARTCR5); |
|
temp &= ~UARTCR5_RDMAS; |
|
writeb(temp | UARTCR5_TDMAS, port->membase + UARTCR5); |
|
} |
|
|
|
ret = devm_request_irq(port->dev, port->irq, lpuart_int, 0, |
|
DRIVER_NAME, sport); |
|
if (ret) |
|
return ret; |
|
|
|
spin_lock_irqsave(&sport->port.lock, flags); |
|
|
|
lpuart_setup_watermark(sport); |
|
|
|
temp = readb(sport->port.membase + UARTCR2); |
|
temp |= (UARTCR2_RIE | UARTCR2_TIE | UARTCR2_RE | UARTCR2_TE); |
|
writeb(temp, sport->port.membase + UARTCR2); |
|
|
|
spin_unlock_irqrestore(&sport->port.lock, flags); |
|
return 0; |
|
} |
|
|
|
static int lpuart32_startup(struct uart_port *port) |
|
{ |
|
struct lpuart_port *sport = container_of(port, struct lpuart_port, port); |
|
int ret; |
|
unsigned long flags; |
|
unsigned long temp; |
|
|
|
/* determine FIFO size */ |
|
temp = lpuart32_read(sport->port.membase + UARTFIFO); |
|
|
|
sport->txfifo_size = 0x1 << (((temp >> UARTFIFO_TXSIZE_OFF) & |
|
UARTFIFO_FIFOSIZE_MASK) - 1); |
|
|
|
sport->rxfifo_size = 0x1 << (((temp >> UARTFIFO_RXSIZE_OFF) & |
|
UARTFIFO_FIFOSIZE_MASK) - 1); |
|
|
|
ret = devm_request_irq(port->dev, port->irq, lpuart32_int, 0, |
|
DRIVER_NAME, sport); |
|
if (ret) |
|
return ret; |
|
|
|
spin_lock_irqsave(&sport->port.lock, flags); |
|
|
|
lpuart32_setup_watermark(sport); |
|
|
|
temp = lpuart32_read(sport->port.membase + UARTCTRL); |
|
temp |= (UARTCTRL_RIE | UARTCTRL_TIE | UARTCTRL_RE | UARTCTRL_TE); |
|
temp |= UARTCTRL_ILIE; |
|
lpuart32_write(temp, sport->port.membase + UARTCTRL); |
|
|
|
spin_unlock_irqrestore(&sport->port.lock, flags); |
|
return 0; |
|
} |
|
|
|
static void lpuart_shutdown(struct uart_port *port) |
|
{ |
|
struct lpuart_port *sport = container_of(port, struct lpuart_port, port); |
|
unsigned char temp; |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&port->lock, flags); |
|
|
|
/* disable Rx/Tx and interrupts */ |
|
temp = readb(port->membase + UARTCR2); |
|
temp &= ~(UARTCR2_TE | UARTCR2_RE | |
|
UARTCR2_TIE | UARTCR2_TCIE | UARTCR2_RIE); |
|
writeb(temp, port->membase + UARTCR2); |
|
|
|
spin_unlock_irqrestore(&port->lock, flags); |
|
|
|
devm_free_irq(port->dev, port->irq, sport); |
|
|
|
if (sport->lpuart_dma_use) { |
|
del_timer_sync(&sport->lpuart_timer); |
|
|
|
lpuart_dma_tx_free(port); |
|
lpuart_dma_rx_free(port); |
|
} |
|
} |
|
|
|
static void lpuart32_shutdown(struct uart_port *port) |
|
{ |
|
struct lpuart_port *sport = container_of(port, struct lpuart_port, port); |
|
unsigned long temp; |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&port->lock, flags); |
|
|
|
/* disable Rx/Tx and interrupts */ |
|
temp = lpuart32_read(port->membase + UARTCTRL); |
|
temp &= ~(UARTCTRL_TE | UARTCTRL_RE | |
|
UARTCTRL_TIE | UARTCTRL_TCIE | UARTCTRL_RIE); |
|
lpuart32_write(temp, port->membase + UARTCTRL); |
|
|
|
spin_unlock_irqrestore(&port->lock, flags); |
|
|
|
devm_free_irq(port->dev, port->irq, sport); |
|
} |
|
|
|
static void |
|
lpuart_set_termios(struct uart_port *port, struct ktermios *termios, |
|
struct ktermios *old) |
|
{ |
|
struct lpuart_port *sport = container_of(port, struct lpuart_port, port); |
|
unsigned long flags; |
|
unsigned char cr1, old_cr1, old_cr2, cr4, bdh, modem; |
|
unsigned int baud; |
|
unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8; |
|
unsigned int sbr, brfa; |
|
|
|
cr1 = old_cr1 = readb(sport->port.membase + UARTCR1); |
|
old_cr2 = readb(sport->port.membase + UARTCR2); |
|
cr4 = readb(sport->port.membase + UARTCR4); |
|
bdh = readb(sport->port.membase + UARTBDH); |
|
modem = readb(sport->port.membase + UARTMODEM); |
|
/* |
|
* only support CS8 and CS7, and for CS7 must enable PE. |
|
* supported mode: |
|
* - (7,e/o,1) |
|
* - (8,n,1) |
|
* - (8,m/s,1) |
|
* - (8,e/o,1) |
|
*/ |
|
while ((termios->c_cflag & CSIZE) != CS8 && |
|
(termios->c_cflag & CSIZE) != CS7) { |
|
termios->c_cflag &= ~CSIZE; |
|
termios->c_cflag |= old_csize; |
|
old_csize = CS8; |
|
} |
|
|
|
if ((termios->c_cflag & CSIZE) == CS8 || |
|
(termios->c_cflag & CSIZE) == CS7) |
|
cr1 = old_cr1 & ~UARTCR1_M; |
|
|
|
if (termios->c_cflag & CMSPAR) { |
|
if ((termios->c_cflag & CSIZE) != CS8) { |
|
termios->c_cflag &= ~CSIZE; |
|
termios->c_cflag |= CS8; |
|
} |
|
cr1 |= UARTCR1_M; |
|
} |
|
|
|
if (termios->c_cflag & CRTSCTS) { |
|
modem |= (UARTMODEM_RXRTSE | UARTMODEM_TXCTSE); |
|
} else { |
|
termios->c_cflag &= ~CRTSCTS; |
|
modem &= ~(UARTMODEM_RXRTSE | UARTMODEM_TXCTSE); |
|
} |
|
|
|
if (termios->c_cflag & CSTOPB) |
|
termios->c_cflag &= ~CSTOPB; |
|
|
|
/* parity must be enabled when CS7 to match 8-bits format */ |
|
if ((termios->c_cflag & CSIZE) == CS7) |
|
termios->c_cflag |= PARENB; |
|
|
|
if ((termios->c_cflag & PARENB)) { |
|
if (termios->c_cflag & CMSPAR) { |
|
cr1 &= ~UARTCR1_PE; |
|
cr1 |= UARTCR1_M; |
|
} else { |
|
cr1 |= UARTCR1_PE; |
|
if ((termios->c_cflag & CSIZE) == CS8) |
|
cr1 |= UARTCR1_M; |
|
if (termios->c_cflag & PARODD) |
|
cr1 |= UARTCR1_PT; |
|
else |
|
cr1 &= ~UARTCR1_PT; |
|
} |
|
} |
|
|
|
/* ask the core to calculate the divisor */ |
|
baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 16); |
|
|
|
spin_lock_irqsave(&sport->port.lock, flags); |
|
|
|
sport->port.read_status_mask = 0; |
|
if (termios->c_iflag & INPCK) |
|
sport->port.read_status_mask |= (UARTSR1_FE | UARTSR1_PE); |
|
if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK)) |
|
sport->port.read_status_mask |= UARTSR1_FE; |
|
|
|
/* characters to ignore */ |
|
sport->port.ignore_status_mask = 0; |
|
if (termios->c_iflag & IGNPAR) |
|
sport->port.ignore_status_mask |= UARTSR1_PE; |
|
if (termios->c_iflag & IGNBRK) { |
|
sport->port.ignore_status_mask |= UARTSR1_FE; |
|
/* |
|
* if we're ignoring parity and break indicators, |
|
* ignore overruns too (for real raw support). |
|
*/ |
|
if (termios->c_iflag & IGNPAR) |
|
sport->port.ignore_status_mask |= UARTSR1_OR; |
|
} |
|
|
|
/* update the per-port timeout */ |
|
uart_update_timeout(port, termios->c_cflag, baud); |
|
|
|
if (sport->lpuart_dma_use) { |
|
/* Calculate delay for 1.5 DMA buffers */ |
|
sport->dma_rx_timeout = (sport->port.timeout - HZ / 50) * |
|
FSL_UART_RX_DMA_BUFFER_SIZE * 3 / |
|
sport->rxfifo_size / 2; |
|
dev_dbg(port->dev, "DMA Rx t-out %ums, tty t-out %u jiffies\n", |
|
sport->dma_rx_timeout * 1000 / HZ, sport->port.timeout); |
|
if (sport->dma_rx_timeout < msecs_to_jiffies(20)) |
|
sport->dma_rx_timeout = msecs_to_jiffies(20); |
|
} |
|
|
|
/* wait transmit engin complete */ |
|
while (!(readb(sport->port.membase + UARTSR1) & UARTSR1_TC)) |
|
barrier(); |
|
|
|
/* disable transmit and receive */ |
|
writeb(old_cr2 & ~(UARTCR2_TE | UARTCR2_RE), |
|
sport->port.membase + UARTCR2); |
|
|
|
sbr = sport->port.uartclk / (16 * baud); |
|
brfa = ((sport->port.uartclk - (16 * sbr * baud)) * 2) / baud; |
|
bdh &= ~UARTBDH_SBR_MASK; |
|
bdh |= (sbr >> 8) & 0x1F; |
|
cr4 &= ~UARTCR4_BRFA_MASK; |
|
brfa &= UARTCR4_BRFA_MASK; |
|
writeb(cr4 | brfa, sport->port.membase + UARTCR4); |
|
writeb(bdh, sport->port.membase + UARTBDH); |
|
writeb(sbr & 0xFF, sport->port.membase + UARTBDL); |
|
writeb(cr1, sport->port.membase + UARTCR1); |
|
writeb(modem, sport->port.membase + UARTMODEM); |
|
|
|
/* restore control register */ |
|
writeb(old_cr2, sport->port.membase + UARTCR2); |
|
|
|
spin_unlock_irqrestore(&sport->port.lock, flags); |
|
} |
|
|
|
static void |
|
lpuart32_set_termios(struct uart_port *port, struct ktermios *termios, |
|
struct ktermios *old) |
|
{ |
|
struct lpuart_port *sport = container_of(port, struct lpuart_port, port); |
|
unsigned long flags; |
|
unsigned long ctrl, old_ctrl, bd, modem; |
|
unsigned int baud; |
|
unsigned int old_csize = old ? old->c_cflag & CSIZE : CS8; |
|
unsigned int sbr; |
|
|
|
ctrl = old_ctrl = lpuart32_read(sport->port.membase + UARTCTRL); |
|
bd = lpuart32_read(sport->port.membase + UARTBAUD); |
|
modem = lpuart32_read(sport->port.membase + UARTMODIR); |
|
/* |
|
* only support CS8 and CS7, and for CS7 must enable PE. |
|
* supported mode: |
|
* - (7,e/o,1) |
|
* - (8,n,1) |
|
* - (8,m/s,1) |
|
* - (8,e/o,1) |
|
*/ |
|
while ((termios->c_cflag & CSIZE) != CS8 && |
|
(termios->c_cflag & CSIZE) != CS7) { |
|
termios->c_cflag &= ~CSIZE; |
|
termios->c_cflag |= old_csize; |
|
old_csize = CS8; |
|
} |
|
|
|
if ((termios->c_cflag & CSIZE) == CS8 || |
|
(termios->c_cflag & CSIZE) == CS7) |
|
ctrl = old_ctrl & ~UARTCTRL_M; |
|
|
|
if (termios->c_cflag & CMSPAR) { |
|
if ((termios->c_cflag & CSIZE) != CS8) { |
|
termios->c_cflag &= ~CSIZE; |
|
termios->c_cflag |= CS8; |
|
} |
|
ctrl |= UARTCTRL_M; |
|
} |
|
|
|
if (termios->c_cflag & CRTSCTS) { |
|
modem |= (UARTMODEM_RXRTSE | UARTMODEM_TXCTSE); |
|
} else { |
|
termios->c_cflag &= ~CRTSCTS; |
|
modem &= ~(UARTMODEM_RXRTSE | UARTMODEM_TXCTSE); |
|
} |
|
|
|
if (termios->c_cflag & CSTOPB) |
|
termios->c_cflag &= ~CSTOPB; |
|
|
|
/* parity must be enabled when CS7 to match 8-bits format */ |
|
if ((termios->c_cflag & CSIZE) == CS7) |
|
termios->c_cflag |= PARENB; |
|
|
|
if ((termios->c_cflag & PARENB)) { |
|
if (termios->c_cflag & CMSPAR) { |
|
ctrl &= ~UARTCTRL_PE; |
|
ctrl |= UARTCTRL_M; |
|
} else { |
|
ctrl |= UARTCR1_PE; |
|
if ((termios->c_cflag & CSIZE) == CS8) |
|
ctrl |= UARTCTRL_M; |
|
if (termios->c_cflag & PARODD) |
|
ctrl |= UARTCTRL_PT; |
|
else |
|
ctrl &= ~UARTCTRL_PT; |
|
} |
|
} |
|
|
|
/* ask the core to calculate the divisor */ |
|
baud = uart_get_baud_rate(port, termios, old, 50, port->uartclk / 16); |
|
|
|
spin_lock_irqsave(&sport->port.lock, flags); |
|
|
|
sport->port.read_status_mask = 0; |
|
if (termios->c_iflag & INPCK) |
|
sport->port.read_status_mask |= (UARTSTAT_FE | UARTSTAT_PE); |
|
if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK)) |
|
sport->port.read_status_mask |= UARTSTAT_FE; |
|
|
|
/* characters to ignore */ |
|
sport->port.ignore_status_mask = 0; |
|
if (termios->c_iflag & IGNPAR) |
|
sport->port.ignore_status_mask |= UARTSTAT_PE; |
|
if (termios->c_iflag & IGNBRK) { |
|
sport->port.ignore_status_mask |= UARTSTAT_FE; |
|
/* |
|
* if we're ignoring parity and break indicators, |
|
* ignore overruns too (for real raw support). |
|
*/ |
|
if (termios->c_iflag & IGNPAR) |
|
sport->port.ignore_status_mask |= UARTSTAT_OR; |
|
} |
|
|
|
/* update the per-port timeout */ |
|
uart_update_timeout(port, termios->c_cflag, baud); |
|
|
|
/* wait transmit engin complete */ |
|
while (!(lpuart32_read(sport->port.membase + UARTSTAT) & UARTSTAT_TC)) |
|
barrier(); |
|
|
|
/* disable transmit and receive */ |
|
lpuart32_write(old_ctrl & ~(UARTCTRL_TE | UARTCTRL_RE), |
|
sport->port.membase + UARTCTRL); |
|
|
|
sbr = sport->port.uartclk / (16 * baud); |
|
bd &= ~UARTBAUD_SBR_MASK; |
|
bd |= sbr & UARTBAUD_SBR_MASK; |
|
bd |= UARTBAUD_BOTHEDGE; |
|
bd &= ~(UARTBAUD_TDMAE | UARTBAUD_RDMAE); |
|
lpuart32_write(bd, sport->port.membase + UARTBAUD); |
|
lpuart32_write(modem, sport->port.membase + UARTMODIR); |
|
lpuart32_write(ctrl, sport->port.membase + UARTCTRL); |
|
/* restore control register */ |
|
|
|
spin_unlock_irqrestore(&sport->port.lock, flags); |
|
} |
|
|
|
static const char *lpuart_type(struct uart_port *port) |
|
{ |
|
return "FSL_LPUART"; |
|
} |
|
|
|
static void lpuart_release_port(struct uart_port *port) |
|
{ |
|
/* nothing to do */ |
|
} |
|
|
|
static int lpuart_request_port(struct uart_port *port) |
|
{ |
|
return 0; |
|
} |
|
|
|
/* configure/autoconfigure the port */ |
|
static void lpuart_config_port(struct uart_port *port, int flags) |
|
{ |
|
if (flags & UART_CONFIG_TYPE) |
|
port->type = PORT_LPUART; |
|
} |
|
|
|
static int lpuart_verify_port(struct uart_port *port, struct serial_struct *ser) |
|
{ |
|
int ret = 0; |
|
|
|
if (ser->type != PORT_UNKNOWN && ser->type != PORT_LPUART) |
|
ret = -EINVAL; |
|
if (port->irq != ser->irq) |
|
ret = -EINVAL; |
|
if (ser->io_type != UPIO_MEM) |
|
ret = -EINVAL; |
|
if (port->uartclk / 16 != ser->baud_base) |
|
ret = -EINVAL; |
|
if (port->iobase != ser->port) |
|
ret = -EINVAL; |
|
if (ser->hub6 != 0) |
|
ret = -EINVAL; |
|
return ret; |
|
} |
|
|
|
static struct uart_ops lpuart_pops = { |
|
.tx_empty = lpuart_tx_empty, |
|
.set_mctrl = lpuart_set_mctrl, |
|
.get_mctrl = lpuart_get_mctrl, |
|
.stop_tx = lpuart_stop_tx, |
|
.start_tx = lpuart_start_tx, |
|
.stop_rx = lpuart_stop_rx, |
|
.break_ctl = lpuart_break_ctl, |
|
.startup = lpuart_startup, |
|
.shutdown = lpuart_shutdown, |
|
.set_termios = lpuart_set_termios, |
|
.type = lpuart_type, |
|
.request_port = lpuart_request_port, |
|
.release_port = lpuart_release_port, |
|
.config_port = lpuart_config_port, |
|
.verify_port = lpuart_verify_port, |
|
}; |
|
|
|
static struct uart_ops lpuart32_pops = { |
|
.tx_empty = lpuart32_tx_empty, |
|
.set_mctrl = lpuart32_set_mctrl, |
|
.get_mctrl = lpuart32_get_mctrl, |
|
.stop_tx = lpuart32_stop_tx, |
|
.start_tx = lpuart32_start_tx, |
|
.stop_rx = lpuart32_stop_rx, |
|
.break_ctl = lpuart32_break_ctl, |
|
.startup = lpuart32_startup, |
|
.shutdown = lpuart32_shutdown, |
|
.set_termios = lpuart32_set_termios, |
|
.type = lpuart_type, |
|
.request_port = lpuart_request_port, |
|
.release_port = lpuart_release_port, |
|
.config_port = lpuart_config_port, |
|
.verify_port = lpuart_verify_port, |
|
}; |
|
|
|
static struct lpuart_port *lpuart_ports[UART_NR]; |
|
|
|
#ifdef CONFIG_SERIAL_FSL_LPUART_CONSOLE |
|
static void lpuart_console_putchar(struct uart_port *port, int ch) |
|
{ |
|
while (!(readb(port->membase + UARTSR1) & UARTSR1_TDRE)) |
|
barrier(); |
|
|
|
writeb(ch, port->membase + UARTDR); |
|
} |
|
|
|
static void lpuart32_console_putchar(struct uart_port *port, int ch) |
|
{ |
|
while (!(lpuart32_read(port->membase + UARTSTAT) & UARTSTAT_TDRE)) |
|
barrier(); |
|
|
|
lpuart32_write(ch, port->membase + UARTDATA); |
|
} |
|
|
|
static void |
|
lpuart_console_write(struct console *co, const char *s, unsigned int count) |
|
{ |
|
struct lpuart_port *sport = lpuart_ports[co->index]; |
|
unsigned char old_cr2, cr2; |
|
|
|
/* first save CR2 and then disable interrupts */ |
|
cr2 = old_cr2 = readb(sport->port.membase + UARTCR2); |
|
cr2 |= (UARTCR2_TE | UARTCR2_RE); |
|
cr2 &= ~(UARTCR2_TIE | UARTCR2_TCIE | UARTCR2_RIE); |
|
writeb(cr2, sport->port.membase + UARTCR2); |
|
|
|
uart_console_write(&sport->port, s, count, lpuart_console_putchar); |
|
|
|
/* wait for transmitter finish complete and restore CR2 */ |
|
while (!(readb(sport->port.membase + UARTSR1) & UARTSR1_TC)) |
|
barrier(); |
|
|
|
writeb(old_cr2, sport->port.membase + UARTCR2); |
|
} |
|
|
|
static void |
|
lpuart32_console_write(struct console *co, const char *s, unsigned int count) |
|
{ |
|
struct lpuart_port *sport = lpuart_ports[co->index]; |
|
unsigned long old_cr, cr; |
|
|
|
/* first save CR2 and then disable interrupts */ |
|
cr = old_cr = lpuart32_read(sport->port.membase + UARTCTRL); |
|
cr |= (UARTCTRL_TE | UARTCTRL_RE); |
|
cr &= ~(UARTCTRL_TIE | UARTCTRL_TCIE | UARTCTRL_RIE); |
|
lpuart32_write(cr, sport->port.membase + UARTCTRL); |
|
|
|
uart_console_write(&sport->port, s, count, lpuart32_console_putchar); |
|
|
|
/* wait for transmitter finish complete and restore CR2 */ |
|
while (!(lpuart32_read(sport->port.membase + UARTSTAT) & UARTSTAT_TC)) |
|
barrier(); |
|
|
|
lpuart32_write(old_cr, sport->port.membase + UARTCTRL); |
|
} |
|
|
|
/* |
|
* if the port was already initialised (eg, by a boot loader), |
|
* try to determine the current setup. |
|
*/ |
|
static void __init |
|
lpuart_console_get_options(struct lpuart_port *sport, int *baud, |
|
int *parity, int *bits) |
|
{ |
|
unsigned char cr, bdh, bdl, brfa; |
|
unsigned int sbr, uartclk, baud_raw; |
|
|
|
cr = readb(sport->port.membase + UARTCR2); |
|
cr &= UARTCR2_TE | UARTCR2_RE; |
|
if (!cr) |
|
return; |
|
|
|
/* ok, the port was enabled */ |
|
|
|
cr = readb(sport->port.membase + UARTCR1); |
|
|
|
*parity = 'n'; |
|
if (cr & UARTCR1_PE) { |
|
if (cr & UARTCR1_PT) |
|
*parity = 'o'; |
|
else |
|
*parity = 'e'; |
|
} |
|
|
|
if (cr & UARTCR1_M) |
|
*bits = 9; |
|
else |
|
*bits = 8; |
|
|
|
bdh = readb(sport->port.membase + UARTBDH); |
|
bdh &= UARTBDH_SBR_MASK; |
|
bdl = readb(sport->port.membase + UARTBDL); |
|
sbr = bdh; |
|
sbr <<= 8; |
|
sbr |= bdl; |
|
brfa = readb(sport->port.membase + UARTCR4); |
|
brfa &= UARTCR4_BRFA_MASK; |
|
|
|
uartclk = clk_get_rate(sport->clk); |
|
/* |
|
* baud = mod_clk/(16*(sbr[13]+(brfa)/32) |
|
*/ |
|
baud_raw = uartclk / (16 * (sbr + brfa / 32)); |
|
|
|
if (*baud != baud_raw) |
|
printk(KERN_INFO "Serial: Console lpuart rounded baud rate" |
|
"from %d to %d\n", baud_raw, *baud); |
|
} |
|
|
|
static void __init |
|
lpuart32_console_get_options(struct lpuart_port *sport, int *baud, |
|
int *parity, int *bits) |
|
{ |
|
unsigned long cr, bd; |
|
unsigned int sbr, uartclk, baud_raw; |
|
|
|
cr = lpuart32_read(sport->port.membase + UARTCTRL); |
|
cr &= UARTCTRL_TE | UARTCTRL_RE; |
|
if (!cr) |
|
return; |
|
|
|
/* ok, the port was enabled */ |
|
|
|
cr = lpuart32_read(sport->port.membase + UARTCTRL); |
|
|
|
*parity = 'n'; |
|
if (cr & UARTCTRL_PE) { |
|
if (cr & UARTCTRL_PT) |
|
*parity = 'o'; |
|
else |
|
*parity = 'e'; |
|
} |
|
|
|
if (cr & UARTCTRL_M) |
|
*bits = 9; |
|
else |
|
*bits = 8; |
|
|
|
bd = lpuart32_read(sport->port.membase + UARTBAUD); |
|
bd &= UARTBAUD_SBR_MASK; |
|
sbr = bd; |
|
uartclk = clk_get_rate(sport->clk); |
|
/* |
|
* baud = mod_clk/(16*(sbr[13]+(brfa)/32) |
|
*/ |
|
baud_raw = uartclk / (16 * sbr); |
|
|
|
if (*baud != baud_raw) |
|
printk(KERN_INFO "Serial: Console lpuart rounded baud rate" |
|
"from %d to %d\n", baud_raw, *baud); |
|
} |
|
|
|
static int __init lpuart_console_setup(struct console *co, char *options) |
|
{ |
|
struct lpuart_port *sport; |
|
int baud = 115200; |
|
int bits = 8; |
|
int parity = 'n'; |
|
int flow = 'n'; |
|
|
|
/* |
|
* check whether an invalid uart number has been specified, and |
|
* if so, search for the first available port that does have |
|
* console support. |
|
*/ |
|
if (co->index == -1 || co->index >= ARRAY_SIZE(lpuart_ports)) |
|
co->index = 0; |
|
|
|
sport = lpuart_ports[co->index]; |
|
if (sport == NULL) |
|
return -ENODEV; |
|
|
|
if (options) |
|
uart_parse_options(options, &baud, &parity, &bits, &flow); |
|
else |
|
if (sport->lpuart32) |
|
lpuart32_console_get_options(sport, &baud, &parity, &bits); |
|
else |
|
lpuart_console_get_options(sport, &baud, &parity, &bits); |
|
|
|
if (sport->lpuart32) |
|
lpuart32_setup_watermark(sport); |
|
else |
|
lpuart_setup_watermark(sport); |
|
|
|
return uart_set_options(&sport->port, co, baud, parity, bits, flow); |
|
} |
|
|
|
static struct uart_driver lpuart_reg; |
|
static struct console lpuart_console = { |
|
.name = DEV_NAME, |
|
.write = lpuart_console_write, |
|
.device = uart_console_device, |
|
.setup = lpuart_console_setup, |
|
.flags = CON_PRINTBUFFER, |
|
.index = -1, |
|
.data = &lpuart_reg, |
|
}; |
|
|
|
static struct console lpuart32_console = { |
|
.name = DEV_NAME, |
|
.write = lpuart32_console_write, |
|
.device = uart_console_device, |
|
.setup = lpuart_console_setup, |
|
.flags = CON_PRINTBUFFER, |
|
.index = -1, |
|
.data = &lpuart_reg, |
|
}; |
|
|
|
#define LPUART_CONSOLE (&lpuart_console) |
|
#define LPUART32_CONSOLE (&lpuart32_console) |
|
#else |
|
#define LPUART_CONSOLE NULL |
|
#define LPUART32_CONSOLE NULL |
|
#endif |
|
|
|
static struct uart_driver lpuart_reg = { |
|
.owner = THIS_MODULE, |
|
.driver_name = DRIVER_NAME, |
|
.dev_name = DEV_NAME, |
|
.nr = ARRAY_SIZE(lpuart_ports), |
|
.cons = LPUART_CONSOLE, |
|
}; |
|
|
|
static int lpuart_probe(struct platform_device *pdev) |
|
{ |
|
struct device_node *np = pdev->dev.of_node; |
|
struct lpuart_port *sport; |
|
struct resource *res; |
|
int ret; |
|
|
|
sport = devm_kzalloc(&pdev->dev, sizeof(*sport), GFP_KERNEL); |
|
if (!sport) |
|
return -ENOMEM; |
|
|
|
pdev->dev.coherent_dma_mask = 0; |
|
|
|
ret = of_alias_get_id(np, "serial"); |
|
if (ret < 0) { |
|
dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret); |
|
return ret; |
|
} |
|
sport->port.line = ret; |
|
sport->lpuart32 = of_device_is_compatible(np, "fsl,ls1021a-lpuart"); |
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
|
if (!res) |
|
return -ENODEV; |
|
|
|
sport->port.mapbase = res->start; |
|
sport->port.membase = devm_ioremap_resource(&pdev->dev, res); |
|
if (IS_ERR(sport->port.membase)) |
|
return PTR_ERR(sport->port.membase); |
|
|
|
sport->port.dev = &pdev->dev; |
|
sport->port.type = PORT_LPUART; |
|
sport->port.iotype = UPIO_MEM; |
|
sport->port.irq = platform_get_irq(pdev, 0); |
|
if (sport->lpuart32) |
|
sport->port.ops = &lpuart32_pops; |
|
else |
|
sport->port.ops = &lpuart_pops; |
|
sport->port.flags = UPF_BOOT_AUTOCONF; |
|
|
|
sport->clk = devm_clk_get(&pdev->dev, "ipg"); |
|
if (IS_ERR(sport->clk)) { |
|
ret = PTR_ERR(sport->clk); |
|
dev_err(&pdev->dev, "failed to get uart clk: %d\n", ret); |
|
return ret; |
|
} |
|
|
|
ret = clk_prepare_enable(sport->clk); |
|
if (ret) { |
|
dev_err(&pdev->dev, "failed to enable uart clk: %d\n", ret); |
|
return ret; |
|
} |
|
|
|
sport->port.uartclk = clk_get_rate(sport->clk); |
|
|
|
lpuart_ports[sport->port.line] = sport; |
|
|
|
platform_set_drvdata(pdev, &sport->port); |
|
|
|
if (sport->lpuart32) |
|
lpuart_reg.cons = LPUART32_CONSOLE; |
|
else |
|
lpuart_reg.cons = LPUART_CONSOLE; |
|
|
|
ret = uart_add_one_port(&lpuart_reg, &sport->port); |
|
if (ret) { |
|
clk_disable_unprepare(sport->clk); |
|
return ret; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int lpuart_remove(struct platform_device *pdev) |
|
{ |
|
struct lpuart_port *sport = platform_get_drvdata(pdev); |
|
|
|
uart_remove_one_port(&lpuart_reg, &sport->port); |
|
|
|
clk_disable_unprepare(sport->clk); |
|
|
|
return 0; |
|
} |
|
|
|
#ifdef CONFIG_PM_SLEEP |
|
static int lpuart_suspend(struct device *dev) |
|
{ |
|
struct lpuart_port *sport = dev_get_drvdata(dev); |
|
|
|
uart_suspend_port(&lpuart_reg, &sport->port); |
|
|
|
return 0; |
|
} |
|
|
|
static int lpuart_resume(struct device *dev) |
|
{ |
|
struct lpuart_port *sport = dev_get_drvdata(dev); |
|
|
|
uart_resume_port(&lpuart_reg, &sport->port); |
|
|
|
return 0; |
|
} |
|
#endif |
|
|
|
static SIMPLE_DEV_PM_OPS(lpuart_pm_ops, lpuart_suspend, lpuart_resume); |
|
|
|
static struct platform_driver lpuart_driver = { |
|
.probe = lpuart_probe, |
|
.remove = lpuart_remove, |
|
.driver = { |
|
.name = "fsl-lpuart", |
|
.owner = THIS_MODULE, |
|
.of_match_table = lpuart_dt_ids, |
|
.pm = &lpuart_pm_ops, |
|
}, |
|
}; |
|
|
|
static int __init lpuart_serial_init(void) |
|
{ |
|
int ret; |
|
|
|
pr_info("serial: Freescale lpuart driver\n"); |
|
|
|
ret = uart_register_driver(&lpuart_reg); |
|
if (ret) |
|
return ret; |
|
|
|
ret = platform_driver_register(&lpuart_driver); |
|
if (ret) |
|
uart_unregister_driver(&lpuart_reg); |
|
|
|
return ret; |
|
} |
|
|
|
static void __exit lpuart_serial_exit(void) |
|
{ |
|
platform_driver_unregister(&lpuart_driver); |
|
uart_unregister_driver(&lpuart_reg); |
|
} |
|
|
|
module_init(lpuart_serial_init); |
|
module_exit(lpuart_serial_exit); |
|
|
|
MODULE_DESCRIPTION("Freescale lpuart serial port driver"); |
|
MODULE_LICENSE("GPL v2");
|
|
|