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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 | // SPDX-License-Identifier: GPL-2.0+ /* * (C) Copyright 2008 - 2015 Michal Simek <monstr@monstr.eu> * Clean driver and add xilinx constant from header file * * (C) Copyright 2004 Atmark Techno, Inc. * Yasushi SHOJI <yashi@atmark-techno.com> */ #include <config.h> #include <dm.h> #include <asm/io.h> #include <linux/bitops.h> #include <linux/compiler.h> #include <serial.h> #define SR_TX_FIFO_FULL BIT(3) /* transmit FIFO full */ #define SR_TX_FIFO_EMPTY BIT(2) /* transmit FIFO empty */ #define SR_RX_FIFO_VALID_DATA BIT(0) /* data in receive FIFO */ #define SR_RX_FIFO_FULL BIT(1) /* receive FIFO full */ #define ULITE_CONTROL_RST_TX 0x01 #define ULITE_CONTROL_RST_RX 0x02 static bool little_endian __section(".data"); struct uartlite { unsigned int rx_fifo; unsigned int tx_fifo; unsigned int status; unsigned int control; }; struct uartlite_plat { #if CONFIG_IS_ENABLED(OF_PLATDATA) struct dtd_serial_uartlite dtplat; #else struct uartlite *regs; #endif }; struct uartlite_priv { struct uartlite *regs; }; static u32 uart_in32(void __iomem *addr) { if (little_endian) return in_le32(addr); else return in_be32(addr); } static void uart_out32(void __iomem *addr, u32 val) { if (little_endian) out_le32(addr, val); else out_be32(addr, val); } static int uartlite_serial_putc(struct udevice *dev, const char ch) { struct uartlite_priv *priv = dev_get_priv(dev); struct uartlite *regs = priv->regs; if (uart_in32(®s->status) & SR_TX_FIFO_FULL) return -EAGAIN; uart_out32(®s->tx_fifo, ch & 0xff); return 0; } static int uartlite_serial_getc(struct udevice *dev) { struct uartlite_priv *priv = dev_get_priv(dev); struct uartlite *regs = priv->regs; if (!(uart_in32(®s->status) & SR_RX_FIFO_VALID_DATA)) return -EAGAIN; return uart_in32(®s->rx_fifo) & 0xff; } static int uartlite_serial_pending(struct udevice *dev, bool input) { struct uartlite_priv *priv = dev_get_priv(dev); struct uartlite *regs = priv->regs; if (input) return uart_in32(®s->status) & SR_RX_FIFO_VALID_DATA; return !(uart_in32(®s->status) & SR_TX_FIFO_EMPTY); } static int uartlite_serial_probe(struct udevice *dev) { struct uartlite_plat *plat = dev_get_plat(dev); struct uartlite_priv *priv = dev_get_priv(dev); struct uartlite *regs; int ret; #if CONFIG_IS_ENABLED(OF_PLATDATA) struct dtd_serial_uartlite *dtplat = &plat->dtplat; regs = (struct uartlite *)dtplat->reg[0]; #else regs = plat->regs; #endif priv->regs = regs; uart_out32(®s->control, 0); uart_out32(®s->control, ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX); ret = uart_in32(®s->status); /* Endianness detection */ if ((ret & SR_TX_FIFO_EMPTY) != SR_TX_FIFO_EMPTY) { little_endian = true; uart_out32(®s->control, ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX); } return 0; } #if !CONFIG_IS_ENABLED(OF_PLATDATA) static int uartlite_serial_of_to_plat(struct udevice *dev) { struct uartlite_plat *plat = dev_get_plat(dev); plat->regs = dev_read_addr_ptr(dev); return 0; } #endif static const struct dm_serial_ops uartlite_serial_ops = { .putc = uartlite_serial_putc, .pending = uartlite_serial_pending, .getc = uartlite_serial_getc, }; static const struct udevice_id uartlite_serial_ids[] = { { .compatible = "xlnx,opb-uartlite-1.00.b", }, { .compatible = "xlnx,xps-uartlite-1.00.a" }, { } }; U_BOOT_DRIVER(serial_uartlite) = { .name = "serial_uartlite", .id = UCLASS_SERIAL, .of_match = uartlite_serial_ids, #if !CONFIG_IS_ENABLED(OF_PLATDATA) .of_to_plat = uartlite_serial_of_to_plat, #endif .priv_auto = sizeof(struct uartlite_priv), .plat_auto = sizeof(struct uartlite_plat), .probe = uartlite_serial_probe, .ops = &uartlite_serial_ops, }; DM_DRIVER_ALIAS(serial_uartlite, xlnx_xps_uartlite_1_00_a) #ifdef CONFIG_DEBUG_UART_UARTLITE #include <debug_uart.h> static inline void _debug_uart_init(void) { struct uartlite *regs = (struct uartlite *)CONFIG_VAL(DEBUG_UART_BASE); int ret; uart_out32(®s->control, 0); uart_out32(®s->control, ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX); ret = uart_in32(®s->status); /* Endianness detection */ if ((ret & SR_TX_FIFO_EMPTY) != SR_TX_FIFO_EMPTY) { little_endian = true; uart_out32(®s->control, ULITE_CONTROL_RST_RX | ULITE_CONTROL_RST_TX); } } static inline void _debug_uart_putc(int ch) { struct uartlite *regs = (struct uartlite *)CONFIG_VAL(DEBUG_UART_BASE); while (uart_in32(®s->status) & SR_TX_FIFO_FULL) ; uart_out32(®s->tx_fifo, ch & 0xff); } DEBUG_UART_FUNCS #endif |