root / hw / char / omap_uart.c @ f53f81e0
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/*
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* TI OMAP processors UART emulation.
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*
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* Copyright (C) 2006-2008 Andrzej Zaborowski <balrog@zabor.org>
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* Copyright (C) 2007-2009 Nokia Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 or
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* (at your option) version 3 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "sysemu/char.h" |
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#include "hw/hw.h" |
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#include "hw/arm/omap.h" |
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#include "hw/char/serial.h" |
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#include "exec/address-spaces.h" |
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/* UARTs */
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struct omap_uart_s {
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MemoryRegion iomem; |
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hwaddr base; |
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SerialState *serial; /* TODO */
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struct omap_target_agent_s *ta;
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omap_clk fclk; |
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qemu_irq irq; |
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uint8_t eblr; |
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uint8_t syscontrol; |
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uint8_t wkup; |
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uint8_t cfps; |
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uint8_t mdr[2];
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uint8_t scr; |
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uint8_t clksel; |
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}; |
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void omap_uart_reset(struct omap_uart_s *s) |
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{ |
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s->eblr = 0x00;
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s->syscontrol = 0;
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s->wkup = 0x3f;
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s->cfps = 0x69;
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s->clksel = 0;
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} |
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struct omap_uart_s *omap_uart_init(hwaddr base,
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qemu_irq irq, omap_clk fclk, omap_clk iclk, |
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qemu_irq txdma, qemu_irq rxdma, |
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const char *label, CharDriverState *chr) |
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{ |
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struct omap_uart_s *s = (struct omap_uart_s *) |
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g_malloc0(sizeof(struct omap_uart_s)); |
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s->base = base; |
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s->fclk = fclk; |
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s->irq = irq; |
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s->serial = serial_mm_init(get_system_memory(), base, 2, irq,
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omap_clk_getrate(fclk)/16,
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chr ?: qemu_chr_new(label, "null", NULL), |
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DEVICE_NATIVE_ENDIAN); |
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return s;
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} |
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static uint64_t omap_uart_read(void *opaque, hwaddr addr, |
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unsigned size)
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{ |
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struct omap_uart_s *s = (struct omap_uart_s *) opaque; |
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if (size == 4) { |
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return omap_badwidth_read8(opaque, addr);
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} |
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switch (addr) {
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case 0x20: /* MDR1 */ |
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return s->mdr[0]; |
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case 0x24: /* MDR2 */ |
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return s->mdr[1]; |
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case 0x40: /* SCR */ |
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return s->scr;
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case 0x44: /* SSR */ |
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return 0x0; |
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case 0x48: /* EBLR (OMAP2) */ |
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return s->eblr;
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case 0x4C: /* OSC_12M_SEL (OMAP1) */ |
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return s->clksel;
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case 0x50: /* MVR */ |
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return 0x30; |
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case 0x54: /* SYSC (OMAP2) */ |
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return s->syscontrol;
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case 0x58: /* SYSS (OMAP2) */ |
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return 1; |
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case 0x5c: /* WER (OMAP2) */ |
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return s->wkup;
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case 0x60: /* CFPS (OMAP2) */ |
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return s->cfps;
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} |
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OMAP_BAD_REG(addr); |
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return 0; |
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} |
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static void omap_uart_write(void *opaque, hwaddr addr, |
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uint64_t value, unsigned size)
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{ |
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struct omap_uart_s *s = (struct omap_uart_s *) opaque; |
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if (size == 4) { |
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return omap_badwidth_write8(opaque, addr, value);
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} |
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switch (addr) {
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case 0x20: /* MDR1 */ |
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s->mdr[0] = value & 0x7f; |
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break;
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case 0x24: /* MDR2 */ |
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s->mdr[1] = value & 0xff; |
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break;
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case 0x40: /* SCR */ |
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s->scr = value & 0xff;
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break;
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case 0x48: /* EBLR (OMAP2) */ |
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s->eblr = value & 0xff;
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break;
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case 0x4C: /* OSC_12M_SEL (OMAP1) */ |
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s->clksel = value & 1;
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break;
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case 0x44: /* SSR */ |
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case 0x50: /* MVR */ |
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case 0x58: /* SYSS (OMAP2) */ |
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OMAP_RO_REG(addr); |
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break;
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case 0x54: /* SYSC (OMAP2) */ |
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s->syscontrol = value & 0x1d;
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if (value & 2) |
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omap_uart_reset(s); |
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break;
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case 0x5c: /* WER (OMAP2) */ |
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s->wkup = value & 0x7f;
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break;
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case 0x60: /* CFPS (OMAP2) */ |
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s->cfps = value & 0xff;
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break;
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default:
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OMAP_BAD_REG(addr); |
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} |
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} |
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static const MemoryRegionOps omap_uart_ops = { |
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.read = omap_uart_read, |
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.write = omap_uart_write, |
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.endianness = DEVICE_NATIVE_ENDIAN, |
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}; |
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struct omap_uart_s *omap2_uart_init(MemoryRegion *sysmem,
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struct omap_target_agent_s *ta,
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qemu_irq irq, omap_clk fclk, omap_clk iclk, |
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qemu_irq txdma, qemu_irq rxdma, |
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const char *label, CharDriverState *chr) |
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{ |
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hwaddr base = omap_l4_attach(ta, 0, NULL); |
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struct omap_uart_s *s = omap_uart_init(base, irq,
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fclk, iclk, txdma, rxdma, label, chr); |
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memory_region_init_io(&s->iomem, NULL, &omap_uart_ops, s, "omap.uart", 0x100); |
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s->ta = ta; |
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memory_region_add_subregion(sysmem, base + 0x20, &s->iomem);
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return s;
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} |
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void omap_uart_attach(struct omap_uart_s *s, CharDriverState *chr) |
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{ |
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/* TODO: Should reuse or destroy current s->serial */
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s->serial = serial_mm_init(get_system_memory(), s->base, 2, s->irq,
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omap_clk_getrate(s->fclk) / 16,
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chr ?: qemu_chr_new("null", "null", NULL), |
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DEVICE_NATIVE_ENDIAN); |
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} |