/* * \brief Driver for Freescale's i.MX UART * \author Norman Feske * \author Martin Stein * \date 2012-08-30 */ /* * Copyright (C) 2012-2017 Genode Labs GmbH * * This file is part of the Genode OS framework, which is distributed * under the terms of the GNU Affero General Public License version 3. */ #ifndef _INCLUDE__DRIVERS__UART__IMX_H_ #define _INCLUDE__DRIVERS__UART__IMX_H_ /* Genode includes */ #include namespace Genode { class Imx_uart; } /** * Driver base for i.MX UART-module */ class Genode::Imx_uart: Mmio { /** * Control register 1 */ struct Cr1 : Register<0x80, 32> { struct Uart_en : Bitfield<0, 1> { }; /* enable UART */ struct Doze : Bitfield<1, 1> { }; /* disable on doze */ struct At_dma_en : Bitfield<2, 1> { }; /* aging DMA * timer on */ struct Tx_dma_en : Bitfield<3, 1> { }; /* TX ready DMA on */ struct Snd_brk : Bitfield<4, 1> { }; /* send breaks */ struct Rtsd_en : Bitfield<5, 1> { }; /* RTS delta IRQ on */ struct Tx_mpty_en : Bitfield<6, 1> { }; /* TX empty IRQ on */ struct Ir_en : Bitfield<7, 1> { }; /* enable infrared */ struct Rx_dma_en : Bitfield<8, 1> { }; /* RX ready DMA on */ struct R_rdy_en : Bitfield<9, 1> { }; /* RX ready IRQ on */ struct Icd : Bitfield<10, 2> /* idle IRQ condition */ { enum { IDLE_4_FRAMES = 0 }; }; struct Id_en : Bitfield<12, 1> { }; /* enable idle IRQ */ struct T_rdy_en : Bitfield<13, 1> { }; /* TX ready IRQ on */ struct Adbr : Bitfield<14, 1> { }; /* enable baud-rate * auto detect */ struct Ad_en : Bitfield<15, 1> { }; /* enable ADBR IRQ */ /** * Initialization value */ static access_t init_value() { return Uart_en::bits(1) | Doze::bits(0) | At_dma_en::bits(0) | Tx_dma_en::bits(0) | Snd_brk::bits(0) | Rtsd_en::bits(0) | Tx_mpty_en::bits(0) | Ir_en::bits(0) | Rx_dma_en::bits(0) | R_rdy_en::bits(0) | Id_en::bits(0) | T_rdy_en::bits(0) | Adbr::bits(0) | Ad_en::bits(0); } }; /** * Control register 2 */ struct Cr2 : Register<0x84, 32> { struct S_rst : Bitfield<0, 1> /* SW reset bit */ { enum { NO_RESET = 1 }; }; struct Rx_en : Bitfield<1, 1> { }; /* enable receiver */ struct Tx_en : Bitfield<2, 1> { }; /* enable transmitter */ struct At_en : Bitfield<3, 1> { }; /* enable aging timer */ struct Rts_en : Bitfield<4, 1> { }; /* send request IRQ on */ struct Ws : Bitfield<5, 1> /* select word size */ { enum { _8_BITS = 1 }; }; struct Stpb : Bitfield<6, 1> /* number of stop bits */ { enum { _1_BIT = 0 }; }; struct Pr_en : Bitfield<8, 1> { }; /* enable parity */ struct Esc_en : Bitfield<11, 1> { }; /* escape detection on */ struct Ctsc : Bitfield<13, 1> /* select CTS control */ { enum { BY_RECEIVER = 1 }; }; struct Irts : Bitfield<14, 1> { }; /* ignore RTS pin */ struct Esci : Bitfield<15, 1> { }; /* enable escape IRQ */ /** * Initialization value */ static access_t init_value() { return S_rst::bits(S_rst::NO_RESET) | Rx_en::bits(0) | Tx_en::bits(1) | At_en::bits(0) | Rts_en::bits(0) | Ws::bits(Ws::_8_BITS) | Stpb::bits(Stpb::_1_BIT) | Pr_en::bits(0) | Esc_en::bits(0) | Ctsc::bits(Ctsc::BY_RECEIVER) | Irts::bits(1) | Esci::bits(0); } }; /** * Control register 3 */ struct Cr3 : Register<0x88, 32> { struct Rxdmux_sel : Bitfield<2, 1> { }; /* use muxed RXD */ struct Aci_en : Bitfield<0, 1> { }; /* autobaud count IRQ on */ struct Dtrd_en : Bitfield<3, 1> { }; /* data terminal ready * delta IRQ on */ struct Awak_en : Bitfield<4, 1> { }; /* wake IRQ on */ struct Air_int_en : Bitfield<5, 1> { }; /* IR wake IRQ on */ struct Rx_ds_en : Bitfield<6, 1> { }; /* RX status IRQ on */ struct Ad_nimp : Bitfield<7, 1> { }; /* autobaud detect off */ struct Ri_en : Bitfield<8, 1> { }; /* ring indicator IRQ on */ struct Dcd_en : Bitfield<9, 1> { }; /* data carrier detect * IRQ on */ struct Dsr : Bitfield<10,1> { }; /* DSR/DTR output */ struct Frame_en : Bitfield<11,1> { }; /* frame error IRQ on */ struct Parity_en : Bitfield<12,1> { }; /* parity error IRQ on */ struct Dtr_en : Bitfield<13,1> { }; /* data terminal ready * IRQ on */ struct Dpec_ctrl : Bitfield<14,2> { }; /* DTR/DSR IRQ edge * control */ /** * Initialization value */ static access_t init_value() { return Aci_en::bits(0) | Rxdmux_sel::bits(0) | Dtrd_en::bits(0) | Awak_en::bits(0) | Air_int_en::bits(0) | Rx_ds_en::bits(0) | Ad_nimp::bits(1) | Ri_en::bits(0) | Dcd_en::bits(0) | Dsr::bits(0) | Frame_en::bits(0) | Parity_en::bits(0) | Dtr_en::bits(0) | Dpec_ctrl::bits(0); } }; /** * Control register 4 */ struct Cr4 : Register<0x8c, 32> { struct Dr_en : Bitfield<0, 1> { }; /* RX data ready IRQ on */ struct Or_en : Bitfield<1, 1> { }; /* RX overrun IRQ on */ struct Bk_en : Bitfield<2, 1> { }; /* BREAK IRQ on */ struct Tc_en : Bitfield<3, 1> { }; /* TX complete IRQ on */ struct Lp_dis : Bitfield<4, 1> { }; /* low power off */ struct IR_sc : Bitfield<5, 1> { }; /* use UART ref clock * for vote logic */ struct Id_dma_en : Bitfield<6, 1> { }; /* idle DMA IRQ on */ struct Wake_en : Bitfield<7, 1> { }; /* WAKE IRQ on */ struct IR_en : Bitfield<8, 1> { }; /* serial IR IRQ on */ struct Cts_level : Bitfield<10,6> { }; /* CTS trigger level*/ /** * Initialization value */ static access_t init_value() { return Dr_en::bits(0) | Or_en::bits(0) | Bk_en::bits(0) | Tc_en::bits(0) | Lp_dis::bits(0) | IR_sc::bits(0) | Id_dma_en::bits(0) | Wake_en::bits(0) | IR_en::bits(0) | Cts_level::bits(0); } }; /** * Status register 2 */ struct Sr2 : Register<0x98, 32> { struct Txdc : Bitfield<3, 1> { }; /* transmission complete */ }; /** * Transmitter register */ struct Txd : Register<0x40, 32> { struct Tx_data : Bitfield<0, 8> { }; /* transmit data */ }; /** * Transmit character 'c' without care about its type */ void _put_char(char c) { while (!read()) ; write(c); } public: /** * Constructor * * \param base device MMIO base */ Imx_uart(addr_t base, uint32_t, uint32_t) : Mmio(base) { write(Cr1::init_value()); write(Cr2::init_value()); write(Cr3::init_value()); write(Cr4::init_value()); } /** * Print character 'c' through the UART */ void put_char(char c) { enum { ASCII_LINE_FEED = 10, ASCII_CARRIAGE_RETURN = 13 }; /* prepend line feed with carriage return */ if (c == ASCII_LINE_FEED) _put_char(ASCII_CARRIAGE_RETURN); /* transmit character */ _put_char(c); } }; #endif /* _INCLUDE__DRIVERS__UART__IMX_H_ */