diff options
Diffstat (limited to 'hw/omap_uart.c')
| -rw-r--r-- | hw/omap_uart.c | 194 |
1 files changed, 194 insertions, 0 deletions
diff --git a/hw/omap_uart.c b/hw/omap_uart.c new file mode 100644 index 0000000000..395bf0ccbb --- /dev/null +++ b/hw/omap_uart.c @@ -0,0 +1,194 @@ +/* + * TI OMAP processors UART emulation. + * + * Copyright (C) 2006-2008 Andrzej Zaborowski <balrog@zabor.org> + * Copyright (C) 2007-2009 Nokia Corporation + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 or + * (at your option) version 3 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, see <http://www.gnu.org/licenses/>. + */ +#include "qemu-char.h" +#include "hw.h" +#include "omap.h" +/* We use pc-style serial ports. */ +#include "pc.h" + +/* UARTs */ +struct omap_uart_s { + target_phys_addr_t base; + SerialState *serial; /* TODO */ + struct omap_target_agent_s *ta; + omap_clk fclk; + qemu_irq irq; + + uint8_t eblr; + uint8_t syscontrol; + uint8_t wkup; + uint8_t cfps; + uint8_t mdr[2]; + uint8_t scr; + uint8_t clksel; +}; + +void omap_uart_reset(struct omap_uart_s *s) +{ + s->eblr = 0x00; + s->syscontrol = 0; + s->wkup = 0x3f; + s->cfps = 0x69; + s->clksel = 0; +} + +struct omap_uart_s *omap_uart_init(target_phys_addr_t base, + qemu_irq irq, omap_clk fclk, omap_clk iclk, + qemu_irq txdma, qemu_irq rxdma, CharDriverState *chr) +{ + struct omap_uart_s *s = (struct omap_uart_s *) + qemu_mallocz(sizeof(struct omap_uart_s)); + + s->base = base; + s->fclk = fclk; + s->irq = irq; +#ifdef TARGET_WORDS_BIGENDIAN + s->serial = serial_mm_init(base, 2, irq, omap_clk_getrate(fclk)/16, + chr ?: qemu_chr_open("null", "null", NULL), 1, + 1); +#else + s->serial = serial_mm_init(base, 2, irq, omap_clk_getrate(fclk)/16, + chr ?: qemu_chr_open("null", "null", NULL), 1, + 0); +#endif + return s; +} + +static uint32_t omap_uart_read(void *opaque, target_phys_addr_t addr) +{ + struct omap_uart_s *s = (struct omap_uart_s *) opaque; + + addr &= 0xff; + switch (addr) { + case 0x20: /* MDR1 */ + return s->mdr[0]; + case 0x24: /* MDR2 */ + return s->mdr[1]; + case 0x40: /* SCR */ + return s->scr; + case 0x44: /* SSR */ + return 0x0; + case 0x48: /* EBLR (OMAP2) */ + return s->eblr; + case 0x4C: /* OSC_12M_SEL (OMAP1) */ + return s->clksel; + case 0x50: /* MVR */ + return 0x30; + case 0x54: /* SYSC (OMAP2) */ + return s->syscontrol; + case 0x58: /* SYSS (OMAP2) */ + return 1; + case 0x5c: /* WER (OMAP2) */ + return s->wkup; + case 0x60: /* CFPS (OMAP2) */ + return s->cfps; + } + + OMAP_BAD_REG(addr); + return 0; +} + +static void omap_uart_write(void *opaque, target_phys_addr_t addr, + uint32_t value) +{ + struct omap_uart_s *s = (struct omap_uart_s *) opaque; + + addr &= 0xff; + switch (addr) { + case 0x20: /* MDR1 */ + s->mdr[0] = value & 0x7f; + break; + case 0x24: /* MDR2 */ + s->mdr[1] = value & 0xff; + break; + case 0x40: /* SCR */ + s->scr = value & 0xff; + break; + case 0x48: /* EBLR (OMAP2) */ + s->eblr = value & 0xff; + break; + case 0x4C: /* OSC_12M_SEL (OMAP1) */ + s->clksel = value & 1; + break; + case 0x44: /* SSR */ + case 0x50: /* MVR */ + case 0x58: /* SYSS (OMAP2) */ + OMAP_RO_REG(addr); + break; + case 0x54: /* SYSC (OMAP2) */ + s->syscontrol = value & 0x1d; + if (value & 2) + omap_uart_reset(s); + break; + case 0x5c: /* WER (OMAP2) */ + s->wkup = value & 0x7f; + break; + case 0x60: /* CFPS (OMAP2) */ + s->cfps = value & 0xff; + break; + default: + OMAP_BAD_REG(addr); + } +} + +static CPUReadMemoryFunc * const omap_uart_readfn[] = { + omap_uart_read, + omap_uart_read, + omap_badwidth_read8, +}; + +static CPUWriteMemoryFunc * const omap_uart_writefn[] = { + omap_uart_write, + omap_uart_write, + omap_badwidth_write8, +}; + +struct omap_uart_s *omap2_uart_init(struct omap_target_agent_s *ta, + qemu_irq irq, omap_clk fclk, omap_clk iclk, + qemu_irq txdma, qemu_irq rxdma, CharDriverState *chr) +{ + target_phys_addr_t base = omap_l4_attach(ta, 0, 0); + struct omap_uart_s *s = omap_uart_init(base, irq, + fclk, iclk, txdma, rxdma, chr); + int iomemtype = cpu_register_io_memory(omap_uart_readfn, + omap_uart_writefn, s); + + s->ta = ta; + + cpu_register_physical_memory(base + 0x20, 0x100, iomemtype); + + return s; +} + +void omap_uart_attach(struct omap_uart_s *s, CharDriverState *chr) +{ + /* TODO: Should reuse or destroy current s->serial */ +#ifdef TARGET_WORDS_BIGENDIAN + s->serial = serial_mm_init(s->base, 2, s->irq, + omap_clk_getrate(s->fclk) / 16, + chr ?: qemu_chr_open("null", "null", NULL), 1, + 1); +#else + s->serial = serial_mm_init(s->base, 2, s->irq, + omap_clk_getrate(s->fclk) / 16, + chr ?: qemu_chr_open("null", "null", NULL), 1, + 0); +#endif +} |