| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | #ifndef __PMAC_ZILOG_H__ |
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| 3 | #define __PMAC_ZILOG_H__ |
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| 4 | |
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| 5 | /* |
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| 6 | * At most 2 ESCCs with 2 ports each |
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| 7 | */ |
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| 8 | #define MAX_ZS_PORTS 4 |
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| 9 | |
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| 10 | /* |
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| 11 | * We wrap our port structure around the generic uart_port. |
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| 12 | */ |
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| 13 | #define NUM_ZSREGS 17 |
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| 14 | |
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| 15 | struct uart_pmac_port { |
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| 16 | struct uart_port port; |
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| 17 | struct uart_pmac_port *mate; |
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| 18 | |
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| 19 | #ifdef CONFIG_PPC_PMAC |
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| 20 | /* macio_dev for the escc holding this port (maybe be null on |
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| 21 | * early inited port) |
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| 22 | */ |
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| 23 | struct macio_dev *dev; |
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| 24 | /* device node to this port, this points to one of 2 childs |
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| 25 | * of "escc" node (ie. ch-a or ch-b) |
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| 26 | */ |
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| 27 | struct device_node *node; |
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| 28 | #else |
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| 29 | struct platform_device *pdev; |
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| 30 | #endif |
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| 31 | |
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| 32 | /* Port type as obtained from device tree (IRDA, modem, ...) */ |
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| 33 | int port_type; |
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| 34 | u8 curregs[NUM_ZSREGS]; |
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| 35 | |
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| 36 | unsigned int flags; |
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| 37 | #define PMACZILOG_FLAG_IS_CONS 0x00000001 |
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| 38 | #define PMACZILOG_FLAG_IS_KGDB 0x00000002 |
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| 39 | #define PMACZILOG_FLAG_MODEM_STATUS 0x00000004 |
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| 40 | #define PMACZILOG_FLAG_IS_CHANNEL_A 0x00000008 |
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| 41 | #define PMACZILOG_FLAG_REGS_HELD 0x00000010 |
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| 42 | #define PMACZILOG_FLAG_TX_STOPPED 0x00000020 |
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| 43 | #define PMACZILOG_FLAG_TX_ACTIVE 0x00000040 |
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| 44 | #define PMACZILOG_FLAG_IS_IRDA 0x00000100 |
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| 45 | #define PMACZILOG_FLAG_IS_INTMODEM 0x00000200 |
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| 46 | #define PMACZILOG_FLAG_RSRC_REQUESTED 0x00000800 |
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| 47 | #define PMACZILOG_FLAG_IS_OPEN 0x00002000 |
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| 48 | #define PMACZILOG_FLAG_IS_EXTCLK 0x00008000 |
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| 49 | #define PMACZILOG_FLAG_BREAK 0x00010000 |
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| 50 | |
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| 51 | unsigned char parity_mask; |
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| 52 | unsigned char prev_status; |
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| 53 | |
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| 54 | volatile u8 __iomem *control_reg; |
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| 55 | volatile u8 __iomem *data_reg; |
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| 56 | |
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| 57 | unsigned char irq_name[8]; |
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| 58 | }; |
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| 59 | |
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| 60 | #define to_pmz(p) ((struct uart_pmac_port *)(p)) |
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| 61 | |
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| 62 | static inline struct uart_pmac_port *pmz_get_port_A(struct uart_pmac_port *uap) |
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| 63 | { |
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| 64 | if (uap->flags & PMACZILOG_FLAG_IS_CHANNEL_A) |
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| 65 | return uap; |
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| 66 | return uap->mate; |
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| 67 | } |
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| 68 | |
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| 69 | /* |
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| 70 | * Register accessors. Note that we don't need to enforce a recovery |
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| 71 | * delay on PCI PowerMac hardware, it's dealt in HW by the MacIO chip, |
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| 72 | * though if we try to use this driver on older machines, we might have |
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| 73 | * to add it back |
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| 74 | */ |
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| 75 | static inline u8 read_zsreg(struct uart_pmac_port *port, u8 reg) |
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| 76 | { |
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| 77 | if (reg != 0) |
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| 78 | writeb(val: reg, addr: port->control_reg); |
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| 79 | return readb(addr: port->control_reg); |
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| 80 | } |
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| 81 | |
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| 82 | static inline void write_zsreg(struct uart_pmac_port *port, u8 reg, u8 value) |
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| 83 | { |
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| 84 | if (reg != 0) |
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| 85 | writeb(val: reg, addr: port->control_reg); |
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| 86 | writeb(val: value, addr: port->control_reg); |
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| 87 | } |
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| 88 | |
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| 89 | static inline u8 read_zsdata(struct uart_pmac_port *port) |
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| 90 | { |
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| 91 | return readb(addr: port->data_reg); |
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| 92 | } |
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| 93 | |
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| 94 | static inline void write_zsdata(struct uart_pmac_port *port, u8 data) |
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| 95 | { |
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| 96 | writeb(val: data, addr: port->data_reg); |
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| 97 | } |
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| 98 | |
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| 99 | static inline void zssync(struct uart_pmac_port *port) |
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| 100 | { |
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| 101 | (void)readb(addr: port->control_reg); |
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| 102 | } |
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| 103 | |
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| 104 | /* Conversion routines to/from brg time constants from/to bits |
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| 105 | * per second. |
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| 106 | */ |
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| 107 | #define BRG_TO_BPS(brg, freq) ((freq) / 2 / ((brg) + 2)) |
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| 108 | #define BPS_TO_BRG(bps, freq) ((((freq) + (bps)) / (2 * (bps))) - 2) |
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| 109 | |
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| 110 | #define ZS_CLOCK 3686400 /* Z8530 RTxC input clock rate */ |
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| 111 | |
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| 112 | /* The Zilog register set */ |
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| 113 | |
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| 114 | #define FLAG 0x7e |
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| 115 | |
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| 116 | /* Write Register 0 */ |
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| 117 | #define R0 0 /* Register selects */ |
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| 118 | #define R1 1 |
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| 119 | #define R2 2 |
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| 120 | #define R3 3 |
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| 121 | #define R4 4 |
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| 122 | #define R5 5 |
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| 123 | #define R6 6 |
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| 124 | #define R7 7 |
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| 125 | #define R8 8 |
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| 126 | #define R9 9 |
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| 127 | #define R10 10 |
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| 128 | #define R11 11 |
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| 129 | #define R12 12 |
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| 130 | #define R13 13 |
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| 131 | #define R14 14 |
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| 132 | #define R15 15 |
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| 133 | #define R7P 16 |
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| 134 | |
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| 135 | #define NULLCODE 0 /* Null Code */ |
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| 136 | #define POINT_HIGH 0x8 /* Select upper half of registers */ |
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| 137 | #define RES_EXT_INT 0x10 /* Reset Ext. Status Interrupts */ |
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| 138 | #define SEND_ABORT 0x18 /* HDLC Abort */ |
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| 139 | #define RES_RxINT_FC 0x20 /* Reset RxINT on First Character */ |
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| 140 | #define RES_Tx_P 0x28 /* Reset TxINT Pending */ |
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| 141 | #define ERR_RES 0x30 /* Error Reset */ |
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| 142 | #define RES_H_IUS 0x38 /* Reset highest IUS */ |
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| 143 | |
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| 144 | #define RES_Rx_CRC 0x40 /* Reset Rx CRC Checker */ |
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| 145 | #define RES_Tx_CRC 0x80 /* Reset Tx CRC Checker */ |
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| 146 | #define RES_EOM_L 0xC0 /* Reset EOM latch */ |
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| 147 | |
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| 148 | /* Write Register 1 */ |
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| 149 | |
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| 150 | #define EXT_INT_ENAB 0x1 /* Ext Int Enable */ |
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| 151 | #define TxINT_ENAB 0x2 /* Tx Int Enable */ |
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| 152 | #define PAR_SPEC 0x4 /* Parity is special condition */ |
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| 153 | |
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| 154 | #define RxINT_DISAB 0 /* Rx Int Disable */ |
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| 155 | #define RxINT_FCERR 0x8 /* Rx Int on First Character Only or Error */ |
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| 156 | #define INT_ALL_Rx 0x10 /* Int on all Rx Characters or error */ |
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| 157 | #define INT_ERR_Rx 0x18 /* Int on error only */ |
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| 158 | #define RxINT_MASK 0x18 |
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| 159 | |
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| 160 | #define WT_RDY_RT 0x20 /* W/Req reflects recv if 1, xmit if 0 */ |
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| 161 | #define WT_FN_RDYFN 0x40 /* W/Req pin is DMA request if 1, wait if 0 */ |
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| 162 | #define WT_RDY_ENAB 0x80 /* Enable W/Req pin */ |
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| 163 | |
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| 164 | /* Write Register #2 (Interrupt Vector) */ |
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| 165 | |
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| 166 | /* Write Register 3 */ |
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| 167 | |
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| 168 | #define RxENABLE 0x1 /* Rx Enable */ |
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| 169 | #define SYNC_L_INH 0x2 /* Sync Character Load Inhibit */ |
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| 170 | #define ADD_SM 0x4 /* Address Search Mode (SDLC) */ |
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| 171 | #define RxCRC_ENAB 0x8 /* Rx CRC Enable */ |
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| 172 | #define ENT_HM 0x10 /* Enter Hunt Mode */ |
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| 173 | #define AUTO_ENAB 0x20 /* Auto Enables */ |
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| 174 | #define Rx5 0x0 /* Rx 5 Bits/Character */ |
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| 175 | #define Rx7 0x40 /* Rx 7 Bits/Character */ |
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| 176 | #define Rx6 0x80 /* Rx 6 Bits/Character */ |
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| 177 | #define Rx8 0xc0 /* Rx 8 Bits/Character */ |
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| 178 | #define RxN_MASK 0xc0 |
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| 179 | |
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| 180 | /* Write Register 4 */ |
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| 181 | |
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| 182 | #define PAR_ENAB 0x1 /* Parity Enable */ |
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| 183 | #define PAR_EVEN 0x2 /* Parity Even/Odd* */ |
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| 184 | |
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| 185 | #define SYNC_ENAB 0 /* Sync Modes Enable */ |
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| 186 | #define SB1 0x4 /* 1 stop bit/char */ |
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| 187 | #define SB15 0x8 /* 1.5 stop bits/char */ |
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| 188 | #define SB2 0xc /* 2 stop bits/char */ |
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| 189 | #define SB_MASK 0xc |
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| 190 | |
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| 191 | #define MONSYNC 0 /* 8 Bit Sync character */ |
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| 192 | #define BISYNC 0x10 /* 16 bit sync character */ |
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| 193 | #define SDLC 0x20 /* SDLC Mode (01111110 Sync Flag) */ |
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| 194 | #define EXTSYNC 0x30 /* External Sync Mode */ |
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| 195 | |
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| 196 | #define X1CLK 0x0 /* x1 clock mode */ |
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| 197 | #define X16CLK 0x40 /* x16 clock mode */ |
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| 198 | #define X32CLK 0x80 /* x32 clock mode */ |
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| 199 | #define X64CLK 0xC0 /* x64 clock mode */ |
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| 200 | #define XCLK_MASK 0xC0 |
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| 201 | |
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| 202 | /* Write Register 5 */ |
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| 203 | |
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| 204 | #define TxCRC_ENAB 0x1 /* Tx CRC Enable */ |
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| 205 | #define RTS 0x2 /* RTS */ |
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| 206 | #define SDLC_CRC 0x4 /* SDLC/CRC-16 */ |
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| 207 | #define TxENABLE 0x8 /* Tx Enable */ |
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| 208 | #define SND_BRK 0x10 /* Send Break */ |
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| 209 | #define Tx5 0x0 /* Tx 5 bits (or less)/character */ |
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| 210 | #define Tx7 0x20 /* Tx 7 bits/character */ |
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| 211 | #define Tx6 0x40 /* Tx 6 bits/character */ |
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| 212 | #define Tx8 0x60 /* Tx 8 bits/character */ |
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| 213 | #define TxN_MASK 0x60 |
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| 214 | #define DTR 0x80 /* DTR */ |
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| 215 | |
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| 216 | /* Write Register 6 (Sync bits 0-7/SDLC Address Field) */ |
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| 217 | |
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| 218 | /* Write Register 7 (Sync bits 8-15/SDLC 01111110) */ |
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| 219 | |
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| 220 | /* Write Register 7' (Some enhanced feature control) */ |
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| 221 | #define ENEXREAD 0x40 /* Enable read of some write registers */ |
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| 222 | |
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| 223 | /* Write Register 8 (transmit buffer) */ |
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| 224 | |
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| 225 | /* Write Register 9 (Master interrupt control) */ |
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| 226 | #define VIS 1 /* Vector Includes Status */ |
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| 227 | #define NV 2 /* No Vector */ |
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| 228 | #define DLC 4 /* Disable Lower Chain */ |
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| 229 | #define MIE 8 /* Master Interrupt Enable */ |
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| 230 | #define STATHI 0x10 /* Status high */ |
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| 231 | #define NORESET 0 /* No reset on write to R9 */ |
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| 232 | #define CHRB 0x40 /* Reset channel B */ |
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| 233 | #define CHRA 0x80 /* Reset channel A */ |
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| 234 | #define FHWRES 0xc0 /* Force hardware reset */ |
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| 235 | |
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| 236 | /* Write Register 10 (misc control bits) */ |
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| 237 | #define BIT6 1 /* 6 bit/8bit sync */ |
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| 238 | #define LOOPMODE 2 /* SDLC Loop mode */ |
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| 239 | #define ABUNDER 4 /* Abort/flag on SDLC xmit underrun */ |
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| 240 | #define MARKIDLE 8 /* Mark/flag on idle */ |
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| 241 | #define GAOP 0x10 /* Go active on poll */ |
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| 242 | #define NRZ 0 /* NRZ mode */ |
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| 243 | #define NRZI 0x20 /* NRZI mode */ |
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| 244 | #define FM1 0x40 /* FM1 (transition = 1) */ |
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| 245 | #define FM0 0x60 /* FM0 (transition = 0) */ |
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| 246 | #define CRCPS 0x80 /* CRC Preset I/O */ |
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| 247 | |
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| 248 | /* Write Register 11 (Clock Mode control) */ |
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| 249 | #define TRxCXT 0 /* TRxC = Xtal output */ |
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| 250 | #define TRxCTC 1 /* TRxC = Transmit clock */ |
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| 251 | #define TRxCBR 2 /* TRxC = BR Generator Output */ |
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| 252 | #define TRxCDP 3 /* TRxC = DPLL output */ |
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| 253 | #define TRxCOI 4 /* TRxC O/I */ |
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| 254 | #define TCRTxCP 0 /* Transmit clock = RTxC pin */ |
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| 255 | #define TCTRxCP 8 /* Transmit clock = TRxC pin */ |
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| 256 | #define TCBR 0x10 /* Transmit clock = BR Generator output */ |
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| 257 | #define TCDPLL 0x18 /* Transmit clock = DPLL output */ |
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| 258 | #define RCRTxCP 0 /* Receive clock = RTxC pin */ |
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| 259 | #define RCTRxCP 0x20 /* Receive clock = TRxC pin */ |
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| 260 | #define RCBR 0x40 /* Receive clock = BR Generator output */ |
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| 261 | #define RCDPLL 0x60 /* Receive clock = DPLL output */ |
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| 262 | #define RTxCX 0x80 /* RTxC Xtal/No Xtal */ |
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| 263 | |
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| 264 | /* Write Register 12 (lower byte of baud rate generator time constant) */ |
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| 265 | |
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| 266 | /* Write Register 13 (upper byte of baud rate generator time constant) */ |
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| 267 | |
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| 268 | /* Write Register 14 (Misc control bits) */ |
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| 269 | #define BRENAB 1 /* Baud rate generator enable */ |
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| 270 | #define BRSRC 2 /* Baud rate generator source */ |
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| 271 | #define DTRREQ 4 /* DTR/Request function */ |
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| 272 | #define AUTOECHO 8 /* Auto Echo */ |
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| 273 | #define LOOPBAK 0x10 /* Local loopback */ |
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| 274 | #define SEARCH 0x20 /* Enter search mode */ |
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| 275 | #define RMC 0x40 /* Reset missing clock */ |
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| 276 | #define DISDPLL 0x60 /* Disable DPLL */ |
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| 277 | #define SSBR 0x80 /* Set DPLL source = BR generator */ |
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| 278 | #define SSRTxC 0xa0 /* Set DPLL source = RTxC */ |
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| 279 | #define SFMM 0xc0 /* Set FM mode */ |
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| 280 | #define SNRZI 0xe0 /* Set NRZI mode */ |
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| 281 | |
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| 282 | /* Write Register 15 (external/status interrupt control) */ |
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| 283 | #define EN85C30 1 /* Enable some 85c30-enhanced registers */ |
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| 284 | #define ZCIE 2 /* Zero count IE */ |
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| 285 | #define ENSTFIFO 4 /* Enable status FIFO (SDLC) */ |
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| 286 | #define DCDIE 8 /* DCD IE */ |
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| 287 | #define SYNCIE 0x10 /* Sync/hunt IE */ |
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| 288 | #define CTSIE 0x20 /* CTS IE */ |
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| 289 | #define TxUIE 0x40 /* Tx Underrun/EOM IE */ |
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| 290 | #define BRKIE 0x80 /* Break/Abort IE */ |
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| 291 | |
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| 292 | |
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| 293 | /* Read Register 0 */ |
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| 294 | #define Rx_CH_AV 0x1 /* Rx Character Available */ |
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| 295 | #define ZCOUNT 0x2 /* Zero count */ |
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| 296 | #define Tx_BUF_EMP 0x4 /* Tx Buffer empty */ |
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| 297 | #define DCD 0x8 /* DCD */ |
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| 298 | #define SYNC_HUNT 0x10 /* Sync/hunt */ |
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| 299 | #define CTS 0x20 /* CTS */ |
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| 300 | #define TxEOM 0x40 /* Tx underrun */ |
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| 301 | #define BRK_ABRT 0x80 /* Break/Abort */ |
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| 302 | |
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| 303 | /* Read Register 1 */ |
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| 304 | #define ALL_SNT 0x1 /* All sent */ |
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| 305 | /* Residue Data for 8 Rx bits/char programmed */ |
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| 306 | #define RES3 0x8 /* 0/3 */ |
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| 307 | #define RES4 0x4 /* 0/4 */ |
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| 308 | #define RES5 0xc /* 0/5 */ |
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| 309 | #define RES6 0x2 /* 0/6 */ |
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| 310 | #define RES7 0xa /* 0/7 */ |
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| 311 | #define RES8 0x6 /* 0/8 */ |
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| 312 | #define RES18 0xe /* 1/8 */ |
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| 313 | #define RES28 0x0 /* 2/8 */ |
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| 314 | /* Special Rx Condition Interrupts */ |
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| 315 | #define PAR_ERR 0x10 /* Parity error */ |
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| 316 | #define Rx_OVR 0x20 /* Rx Overrun Error */ |
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| 317 | #define CRC_ERR 0x40 /* CRC/Framing Error */ |
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| 318 | #define END_FR 0x80 /* End of Frame (SDLC) */ |
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| 319 | |
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| 320 | /* Read Register 2 (channel b only) - Interrupt vector */ |
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| 321 | #define CHB_Tx_EMPTY 0x00 |
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| 322 | #define CHB_EXT_STAT 0x02 |
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| 323 | #define CHB_Rx_AVAIL 0x04 |
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| 324 | #define CHB_SPECIAL 0x06 |
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| 325 | #define CHA_Tx_EMPTY 0x08 |
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| 326 | #define CHA_EXT_STAT 0x0a |
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| 327 | #define CHA_Rx_AVAIL 0x0c |
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| 328 | #define CHA_SPECIAL 0x0e |
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| 329 | #define STATUS_MASK 0x06 |
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| 330 | |
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| 331 | /* Read Register 3 (interrupt pending register) ch a only */ |
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| 332 | #define CHBEXT 0x1 /* Channel B Ext/Stat IP */ |
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| 333 | #define CHBTxIP 0x2 /* Channel B Tx IP */ |
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| 334 | #define CHBRxIP 0x4 /* Channel B Rx IP */ |
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| 335 | #define CHAEXT 0x8 /* Channel A Ext/Stat IP */ |
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| 336 | #define CHATxIP 0x10 /* Channel A Tx IP */ |
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| 337 | #define CHARxIP 0x20 /* Channel A Rx IP */ |
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| 338 | |
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| 339 | /* Read Register 8 (receive data register) */ |
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| 340 | |
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| 341 | /* Read Register 10 (misc status bits) */ |
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| 342 | #define ONLOOP 2 /* On loop */ |
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| 343 | #define LOOPSEND 0x10 /* Loop sending */ |
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| 344 | #define CLK2MIS 0x40 /* Two clocks missing */ |
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| 345 | #define CLK1MIS 0x80 /* One clock missing */ |
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| 346 | |
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| 347 | /* Read Register 12 (lower byte of baud rate generator constant) */ |
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| 348 | |
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| 349 | /* Read Register 13 (upper byte of baud rate generator constant) */ |
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| 350 | |
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| 351 | /* Read Register 15 (value of WR 15) */ |
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| 352 | |
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| 353 | /* Misc macros */ |
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| 354 | #define ZS_CLEARERR(port) (write_zsreg(port, 0, ERR_RES)) |
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| 355 | #define ZS_CLEARFIFO(port) do { \ |
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| 356 | read_zsdata(port); \ |
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| 357 | read_zsdata(port); \ |
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| 358 | read_zsdata(port); \ |
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| 359 | } while(0) |
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| 360 | |
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| 361 | #define ZS_IS_CONS(UP) ((UP)->flags & PMACZILOG_FLAG_IS_CONS) |
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| 362 | #define ZS_IS_KGDB(UP) ((UP)->flags & PMACZILOG_FLAG_IS_KGDB) |
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| 363 | #define ZS_IS_CHANNEL_A(UP) ((UP)->flags & PMACZILOG_FLAG_IS_CHANNEL_A) |
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| 364 | #define ZS_REGS_HELD(UP) ((UP)->flags & PMACZILOG_FLAG_REGS_HELD) |
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| 365 | #define ZS_TX_STOPPED(UP) ((UP)->flags & PMACZILOG_FLAG_TX_STOPPED) |
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| 366 | #define ZS_TX_ACTIVE(UP) ((UP)->flags & PMACZILOG_FLAG_TX_ACTIVE) |
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| 367 | #define ZS_WANTS_MODEM_STATUS(UP) ((UP)->flags & PMACZILOG_FLAG_MODEM_STATUS) |
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| 368 | #define ZS_IS_IRDA(UP) ((UP)->flags & PMACZILOG_FLAG_IS_IRDA) |
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| 369 | #define ZS_IS_INTMODEM(UP) ((UP)->flags & PMACZILOG_FLAG_IS_INTMODEM) |
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| 370 | #define ZS_IS_OPEN(UP) ((UP)->flags & PMACZILOG_FLAG_IS_OPEN) |
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| 371 | #define ZS_IS_EXTCLK(UP) ((UP)->flags & PMACZILOG_FLAG_IS_EXTCLK) |
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| 372 | |
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| 373 | #endif /* __PMAC_ZILOG_H__ */ |
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| 374 | |
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