// SPDX-License-Identifier: GPL-2.0+/*  * icom.c  *  * Copyright (C) 2001 IBM Corporation. All rights reserved.  *  * Serial device driver.  *  * Based on code from serial.c  */#include <linux/module.h>#include <linux/kernel.h>#include <linux/errno.h>#include <linux/signal.h>#include <linux/timer.h>#include <linux/interrupt.h>#include <linux/tty.h>#include <linux/termios.h>#include <linux/fs.h>#include <linux/tty_flip.h>#include <linux/serial.h>#include <linux/serial_core.h>#include <linux/serial_reg.h>#include <linux/major.h>#include <linux/string.h>#include <linux/fcntl.h>#include <linux/ptrace.h>#include <linux/ioport.h>#include <linux/mm.h>#include <linux/slab.h>#include <linux/init.h>#include <linux/delay.h>#include <linux/pci.h>#include <linux/vmalloc.h>#include <linux/smp.h>#include <linux/spinlock.h>#include <linux/kref.h>#include <linux/firmware.h>#include <linux/bitops.h> #include <linux/io.h>#include <asm/irq.h>#include <linux/uaccess.h> /*#define ICOM_TRACE		 enable port trace capabilities */ #define ICOM_DRIVER_NAME "icom"#define NR_PORTS	       128 static const unsigned int icom_acfg_baud[] = {	300,	600,	900,	1200,	1800,	2400,	3600,	4800,	7200,	9600,	14400,	19200,	28800,	38400,	57600,	76800,	115200,	153600,	230400,	307200,	460800,};#define BAUD_TABLE_LIMIT	(ARRAY_SIZE(icom_acfg_baud) - 1) struct icom_regs {	u32 control;		/* Adapter Control Register     */	u32 interrupt;		/* Adapter Interrupt Register   */	u32 int_mask;		/* Adapter Interrupt Mask Reg   */	u32 int_pri;		/* Adapter Interrupt Priority r */	u32 int_reg_b;		/* Adapter non-masked Interrupt */	u32 resvd01;	u32 resvd02;	u32 resvd03;	u32 control_2;		/* Adapter Control Register 2   */	u32 interrupt_2;	/* Adapter Interrupt Register 2 */	u32 int_mask_2;		/* Adapter Interrupt Mask 2     */	u32 int_pri_2;		/* Adapter Interrupt Prior 2    */	u32 int_reg_2b;		/* Adapter non-masked 2         */}; struct func_dram {	u32 reserved[108];	/* 0-1B0   reserved by personality code */	u32 RcvStatusAddr;	/* 1B0-1B3 Status Address for Next rcv */	u8 RcvStnAddr;		/* 1B4     Receive Station Addr */	u8 IdleState;		/* 1B5     Idle State */	u8 IdleMonitor;		/* 1B6     Idle Monitor */	u8 FlagFillIdleTimer;	/* 1B7     Flag Fill Idle Timer */	u32 XmitStatusAddr;	/* 1B8-1BB Transmit Status Address */	u8 StartXmitCmd;	/* 1BC     Start Xmit Command */	u8 HDLCConfigReg;	/* 1BD     Reserved */	u8 CauseCode;		/* 1BE     Cause code for fatal error */	u8 xchar;		/* 1BF     High priority send */	u32 reserved3;		/* 1C0-1C3 Reserved */	u8 PrevCmdReg;		/* 1C4     Reserved */	u8 CmdReg;		/* 1C5     Command Register */	u8 async_config2;	/* 1C6     Async Config Byte 2 */	u8 async_config3;	/* 1C7     Async Config Byte 3 */	u8 dce_resvd[20];	/* 1C8-1DB DCE Rsvd           */	u8 dce_resvd21;		/* 1DC     DCE Rsvd (21st byte */	u8 misc_flags;		/* 1DD     misc flags         */#define V2_HARDWARE     0x40#define ICOM_HDW_ACTIVE 0x01	u8 call_length;		/* 1DE     Phone #/CFI buff ln */	u8 call_length2;	/* 1DF     Upper byte (unused) */	u32 call_addr;		/* 1E0-1E3 Phn #/CFI buff addr */	u16 timer_value;	/* 1E4-1E5 general timer value */	u8 timer_command;	/* 1E6     general timer cmd  */	u8 dce_command;		/* 1E7     dce command reg    */	u8 dce_cmd_status;	/* 1E8     dce command stat   */	u8 x21_r1_ioff;		/* 1E9     dce ready counter  */	u8 x21_r0_ioff;		/* 1EA     dce not ready ctr  */	u8 x21_ralt_ioff;	/* 1EB     dce CNR counter    */	u8 x21_r1_ion;		/* 1EC     dce ready I on ctr */	u8 rsvd_ier;		/* 1ED     Rsvd for IER (if ne */	u8 ier;			/* 1EE     Interrupt Enable   */	u8 isr;			/* 1EF     Input Signal Reg   */	u8 osr;			/* 1F0     Output Signal Reg  */	u8 reset;		/* 1F1     Reset/Reload Reg   */	u8 disable;		/* 1F2     Disable Reg        */	u8 sync;		/* 1F3     Sync Reg           */	u8 error_stat;		/* 1F4     Error Status       */	u8 cable_id;		/* 1F5     Cable ID           */	u8 cs_length;		/* 1F6     CS Load Length     */	u8 mac_length;		/* 1F7     Mac Load Length    */	u32 cs_load_addr;	/* 1F8-1FB Call Load PCI Addr */	u32 mac_load_addr;	/* 1FC-1FF Mac Load PCI Addr  */}; /* * adapter defines and structures */#define ICOM_CONTROL_START_A         0x00000008#define ICOM_CONTROL_STOP_A          0x00000004#define ICOM_CONTROL_START_B         0x00000002#define ICOM_CONTROL_STOP_B          0x00000001#define ICOM_CONTROL_START_C         0x00000008#define ICOM_CONTROL_STOP_C          0x00000004#define ICOM_CONTROL_START_D         0x00000002#define ICOM_CONTROL_STOP_D          0x00000001#define ICOM_IRAM_OFFSET             0x1000#define ICOM_IRAM_SIZE               0x0C00#define ICOM_DCE_IRAM_OFFSET         0x0A00#define ICOM_CABLE_ID_VALID          0x01#define ICOM_CABLE_ID_MASK           0xF0#define ICOM_DISABLE                 0x80#define CMD_XMIT_RCV_ENABLE          0xC0#define CMD_XMIT_ENABLE              0x40#define CMD_RCV_DISABLE              0x00#define CMD_RCV_ENABLE               0x80#define CMD_RESTART                  0x01#define CMD_HOLD_XMIT                0x02#define CMD_SND_BREAK                0x04#define RS232_CABLE                  0x06#define V24_CABLE                    0x0E#define V35_CABLE                    0x0C#define V36_CABLE                    0x02#define NO_CABLE                     0x00#define START_DOWNLOAD               0x80#define ICOM_INT_MASK_PRC_A          0x00003FFF#define ICOM_INT_MASK_PRC_B          0x3FFF0000#define ICOM_INT_MASK_PRC_C          0x00003FFF#define ICOM_INT_MASK_PRC_D          0x3FFF0000#define INT_RCV_COMPLETED            0x1000#define INT_XMIT_COMPLETED           0x2000#define INT_IDLE_DETECT              0x0800#define INT_RCV_DISABLED             0x0400#define INT_XMIT_DISABLED            0x0200#define INT_RCV_XMIT_SHUTDOWN        0x0100#define INT_FATAL_ERROR              0x0080#define INT_CABLE_PULL               0x0020#define INT_SIGNAL_CHANGE            0x0010#define HDLC_PPP_PURE_ASYNC          0x02#define HDLC_FF_FILL                 0x00#define HDLC_HDW_FLOW                0x01#define START_XMIT                   0x80#define ICOM_ACFG_DRIVE1             0x20#define ICOM_ACFG_NO_PARITY          0x00#define ICOM_ACFG_PARITY_ENAB        0x02#define ICOM_ACFG_PARITY_ODD         0x01#define ICOM_ACFG_8BPC               0x00#define ICOM_ACFG_7BPC               0x04#define ICOM_ACFG_6BPC               0x08#define ICOM_ACFG_5BPC               0x0C#define ICOM_ACFG_1STOP_BIT          0x00#define ICOM_ACFG_2STOP_BIT          0x10#define ICOM_DTR                     0x80#define ICOM_RTS                     0x40#define ICOM_RI                      0x08#define ICOM_DSR                     0x80#define ICOM_DCD                     0x20#define ICOM_CTS                     0x40 #define NUM_XBUFFS 1#define NUM_RBUFFS 2#define RCV_BUFF_SZ 0x0200#define XMIT_BUFF_SZ 0x1000struct statusArea {    /**********************************************/	/* Transmit Status Area                       */    /**********************************************/	struct xmit_status_area{		__le32 leNext;	/* Next entry in Little Endian on Adapter */		__le32 leNextASD;		__le32 leBuffer;	/* Buffer for entry in LE for Adapter */		__le16 leLengthASD;		__le16 leOffsetASD;		__le16 leLength;	/* Length of data in segment */		__le16 flags;#define SA_FLAGS_DONE           0x0080	/* Done with Segment */#define SA_FLAGS_CONTINUED      0x8000	/* More Segments */#define SA_FLAGS_IDLE           0x4000	/* Mark IDLE after frm */#define SA_FLAGS_READY_TO_XMIT  0x0800#define SA_FLAGS_STAT_MASK      0x007F	} xmit[NUM_XBUFFS];     /**********************************************/	/* Receive Status Area                        */    /**********************************************/	struct {		__le32 leNext;	/* Next entry in Little Endian on Adapter */		__le32 leNextASD;		__le32 leBuffer;	/* Buffer for entry in LE for Adapter */		__le16 WorkingLength;	/* size of segment */		__le16 reserv01;		__le16 leLength;	/* Length of data in segment */		__le16 flags;#define SA_FL_RCV_DONE           0x0010	/* Data ready */#define SA_FLAGS_OVERRUN         0x0040#define SA_FLAGS_PARITY_ERROR    0x0080#define SA_FLAGS_FRAME_ERROR     0x0001#define SA_FLAGS_FRAME_TRUNC     0x0002#define SA_FLAGS_BREAK_DET       0x0004	/* set conditionally by device driver, not hardware */#define SA_FLAGS_RCV_MASK        0xFFE6	} rcv[NUM_RBUFFS];}; struct icom_adapter;  #define ICOM_MAJOR       243#define ICOM_MINOR_START 0 struct icom_port {	struct uart_port uart_port;	unsigned char cable_id;	unsigned char read_status_mask;	unsigned char ignore_status_mask;	void __iomem * int_reg;	struct icom_regs __iomem *global_reg;	struct func_dram __iomem *dram;	int port;	struct statusArea *statStg;	dma_addr_t statStg_pci;	__le32 *xmitRestart;	dma_addr_t xmitRestart_pci;	unsigned char *xmit_buf;	dma_addr_t xmit_buf_pci;	unsigned char *recv_buf;	dma_addr_t recv_buf_pci;	int next_rcv;	int status;#define ICOM_PORT_ACTIVE	1	/* Port exists. */#define ICOM_PORT_OFF		0	/* Port does not exist. */	struct icom_adapter *adapter;}; struct icom_adapter {	void __iomem * base_addr;	unsigned long base_addr_pci;	struct pci_dev *pci_dev;	struct icom_port port_info[4];	int index;	int version;#define ADAPTER_V1	0x0001#define ADAPTER_V2	0x0002	u32 subsystem_id;#define FOUR_PORT_MODEL				0x0252#define V2_TWO_PORTS_RVX			0x021A#define V2_ONE_PORT_RVX_ONE_PORT_IMBED_MDM	0x0251	int numb_ports;	struct list_head icom_adapter_entry;	struct kref kref;}; /* prototype */extern void iCom_sercons_init(void); struct lookup_proc_table {	u32	__iomem *global_control_reg;	unsigned long	processor_id;}; struct lookup_int_table {	u32	__iomem *global_int_mask;	unsigned long	processor_id;}; static inline struct icom_port *to_icom_port(struct uart_port *port){	return container_of(port, struct icom_port, uart_port);} static const struct pci_device_id icom_pci_table[] = {	{		.vendor = PCI_VENDOR_ID_IBM,		.device = PCI_DEVICE_ID_IBM_ICOM_DEV_ID_1,		.subvendor = PCI_ANY_ID,		.subdevice = PCI_ANY_ID,		.driver_data = ADAPTER_V1,	},	{		.vendor = PCI_VENDOR_ID_IBM,		.device = PCI_DEVICE_ID_IBM_ICOM_DEV_ID_2,		.subvendor = PCI_VENDOR_ID_IBM,		.subdevice = PCI_DEVICE_ID_IBM_ICOM_V2_TWO_PORTS_RVX,		.driver_data = ADAPTER_V2,	},	{		.vendor = PCI_VENDOR_ID_IBM,		.device = PCI_DEVICE_ID_IBM_ICOM_DEV_ID_2,		.subvendor = PCI_VENDOR_ID_IBM,		.subdevice = PCI_DEVICE_ID_IBM_ICOM_V2_ONE_PORT_RVX_ONE_PORT_MDM,		.driver_data = ADAPTER_V2,	},	{		.vendor = PCI_VENDOR_ID_IBM,		.device = PCI_DEVICE_ID_IBM_ICOM_DEV_ID_2,		.subvendor = PCI_VENDOR_ID_IBM,		.subdevice = PCI_DEVICE_ID_IBM_ICOM_FOUR_PORT_MODEL,		.driver_data = ADAPTER_V2,	},	{		.vendor = PCI_VENDOR_ID_IBM,		.device = PCI_DEVICE_ID_IBM_ICOM_DEV_ID_2,		.subvendor = PCI_VENDOR_ID_IBM,		.subdevice = PCI_DEVICE_ID_IBM_ICOM_V2_ONE_PORT_RVX_ONE_PORT_MDM_PCIE,		.driver_data = ADAPTER_V2,	},	{}}; static struct lookup_proc_table start_proc[4] = {	{NULL, ICOM_CONTROL_START_A},	{NULL, ICOM_CONTROL_START_B},	{NULL, ICOM_CONTROL_START_C},	{NULL, ICOM_CONTROL_START_D}};  static struct lookup_proc_table stop_proc[4] = {	{NULL, ICOM_CONTROL_STOP_A},	{NULL, ICOM_CONTROL_STOP_B},	{NULL, ICOM_CONTROL_STOP_C},	{NULL, ICOM_CONTROL_STOP_D}}; static struct lookup_int_table int_mask_tbl[4] = {	{NULL, ICOM_INT_MASK_PRC_A},	{NULL, ICOM_INT_MASK_PRC_B},	{NULL, ICOM_INT_MASK_PRC_C},	{NULL, ICOM_INT_MASK_PRC_D},};  MODULE_DEVICE_TABLE(pci, icom_pci_table); static LIST_HEAD(icom_adapter_head); /* spinlock for adapter initialization and changing adapter operations */static DEFINE_SPINLOCK(icom_lock); #ifdef ICOM_TRACEstatic inline void trace(struct icom_port *icom_port, char *trace_pt,			unsigned long trace_data){	dev_info(&icom_port->adapter->pci_dev->dev, ":%d:%s - %lx\n",	icom_port->port, trace_pt, trace_data);}#elsestatic inline void trace(struct icom_port *icom_port, char *trace_pt, unsigned long trace_data) {};#endifstatic void icom_kref_release(struct kref *kref); static void free_port_memory(struct icom_port *icom_port){	struct pci_dev *dev = icom_port->adapter->pci_dev; 	trace(icom_port, "RET_PORT_MEM", 0);	if (icom_port->recv_buf) {		dma_free_coherent(&dev->dev, 4096, icom_port->recv_buf,				  icom_port->recv_buf_pci);		icom_port->recv_buf = NULL;	}	if (icom_port->xmit_buf) {		dma_free_coherent(&dev->dev, 4096, icom_port->xmit_buf,				  icom_port->xmit_buf_pci);		icom_port->xmit_buf = NULL;	}	if (icom_port->statStg) {		dma_free_coherent(&dev->dev, 4096, icom_port->statStg,				  icom_port->statStg_pci);		icom_port->statStg = NULL;	} 	if (icom_port->xmitRestart) {		dma_free_coherent(&dev->dev, 4096, icom_port->xmitRestart,				  icom_port->xmitRestart_pci);		icom_port->xmitRestart = NULL;	}} static int get_port_memory(struct icom_port *icom_port){	int index;	unsigned long stgAddr;	unsigned long startStgAddr;	unsigned long offset;	struct pci_dev *dev = icom_port->adapter->pci_dev; 	icom_port->xmit_buf =	    dma_alloc_coherent(&dev->dev, 4096, &icom_port->xmit_buf_pci,			       GFP_KERNEL);	if (!icom_port->xmit_buf) {		dev_err(&dev->dev, "Can not allocate Transmit buffer\n");		return -ENOMEM;	} 	trace(icom_port, "GET_PORT_MEM",	      (unsigned long) icom_port->xmit_buf); 	icom_port->recv_buf =	    dma_alloc_coherent(&dev->dev, 4096, &icom_port->recv_buf_pci,			       GFP_KERNEL);	if (!icom_port->recv_buf) {		dev_err(&dev->dev, "Can not allocate Receive buffer\n");		free_port_memory(icom_port);		return -ENOMEM;	}	trace(icom_port, "GET_PORT_MEM",	      (unsigned long) icom_port->recv_buf); 	icom_port->statStg =	    dma_alloc_coherent(&dev->dev, 4096, &icom_port->statStg_pci,			       GFP_KERNEL);	if (!icom_port->statStg) {		dev_err(&dev->dev, "Can not allocate Status buffer\n");		free_port_memory(icom_port);		return -ENOMEM;	}	trace(icom_port, "GET_PORT_MEM",	      (unsigned long) icom_port->statStg); 	icom_port->xmitRestart =	    dma_alloc_coherent(&dev->dev, 4096, &icom_port->xmitRestart_pci,			       GFP_KERNEL);	if (!icom_port->xmitRestart) {		dev_err(&dev->dev,			"Can not allocate xmit Restart buffer\n");		free_port_memory(icom_port);		return -ENOMEM;	} 	/* FODs: Frame Out Descriptor Queue, this is a FIFO queue that           indicates that frames are to be transmitted	*/ 	stgAddr = (unsigned long) icom_port->statStg;	for (index = 0; index < NUM_XBUFFS; index++) {		trace(icom_port, "FOD_ADDR", stgAddr);		stgAddr = stgAddr + sizeof(icom_port->statStg->xmit[0]);		if (index < (NUM_XBUFFS - 1)) {			memset(&icom_port->statStg->xmit[index], 0, sizeof(struct xmit_status_area));			icom_port->statStg->xmit[index].leLengthASD =			    cpu_to_le16(XMIT_BUFF_SZ);			trace(icom_port, "FOD_ADDR", stgAddr);			trace(icom_port, "FOD_XBUFF",			      (unsigned long) icom_port->xmit_buf);			icom_port->statStg->xmit[index].leBuffer =			    cpu_to_le32(icom_port->xmit_buf_pci);		} else if (index == (NUM_XBUFFS - 1)) {			memset(&icom_port->statStg->xmit[index], 0, sizeof(struct xmit_status_area));			icom_port->statStg->xmit[index].leLengthASD =			    cpu_to_le16(XMIT_BUFF_SZ);			trace(icom_port, "FOD_XBUFF",			      (unsigned long) icom_port->xmit_buf);			icom_port->statStg->xmit[index].leBuffer =			    cpu_to_le32(icom_port->xmit_buf_pci);		} else {			memset(&icom_port->statStg->xmit[index], 0, sizeof(struct xmit_status_area));		}

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