365 lines
9.7 KiB
C
365 lines
9.7 KiB
C
/*
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* Bootloader version of the embedded MPSC/UART driver for the Marvell 64x60.
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* Note: Due to a GT64260A erratum, DMA will be used for UART input (via SDMA).
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*
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* Author: Mark A. Greer <mgreer@mvista.com>
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*
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* 2001 (c) MontaVista Software, Inc. This file is licensed under
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* the terms of the GNU General Public License version 2. This program
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* is licensed "as is" without any warranty of any kind, whether express
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* or implied.
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*/
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/* This code assumes that the data cache has been disabled (L1, L2, L3). */
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#include <linux/types.h>
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#include <linux/serial_reg.h>
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#include <asm/serial.h>
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#include <asm/io.h>
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#include <asm/mv64x60_defs.h>
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#include <mpsc_defs.h>
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#ifdef CONFIG_EV64360
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#include <platforms/ev64360.h>
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u32 mv64x60_console_baud = EV64360_DEFAULT_BAUD;
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u32 mv64x60_mpsc_clk_src = EV64360_MPSC_CLK_SRC; /* TCLK */
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u32 mv64x60_mpsc_clk_freq = EV64360_MPSC_CLK_FREQ;
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#else
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u32 mv64x60_console_baud = 9600;
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u32 mv64x60_mpsc_clk_src = 8; /* TCLK */
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u32 mv64x60_mpsc_clk_freq = 100000000;
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#endif
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extern void udelay(long);
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static void stop_dma(int chan);
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static void __iomem *mv64x60_base = (void __iomem *)CONFIG_MV64X60_NEW_BASE;
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struct sdma_regs {
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u32 sdc;
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u32 sdcm;
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u32 rx_desc;
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u32 rx_buf_ptr;
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u32 scrdp;
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u32 tx_desc;
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u32 sctdp;
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u32 sftdp;
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};
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static struct sdma_regs sdma_regs[2];
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#define SDMA_REGS_INIT(s, reg_base) { \
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(s)->sdc = (reg_base) + SDMA_SDC; \
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(s)->sdcm = (reg_base) + SDMA_SDCM; \
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(s)->rx_desc = (reg_base) + SDMA_RX_DESC; \
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(s)->rx_buf_ptr = (reg_base) + SDMA_RX_BUF_PTR; \
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(s)->scrdp = (reg_base) + SDMA_SCRDP; \
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(s)->tx_desc = (reg_base) + SDMA_TX_DESC; \
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(s)->sctdp = (reg_base) + SDMA_SCTDP; \
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(s)->sftdp = (reg_base) + SDMA_SFTDP; \
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}
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static u32 mpsc_base[2] = { MV64x60_MPSC_0_OFFSET, MV64x60_MPSC_1_OFFSET };
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struct mv64x60_rx_desc {
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u16 bufsize;
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u16 bytecnt;
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u32 cmd_stat;
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u32 next_desc_ptr;
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u32 buffer;
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};
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struct mv64x60_tx_desc {
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u16 bytecnt;
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u16 shadow;
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u32 cmd_stat;
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u32 next_desc_ptr;
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u32 buffer;
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};
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#define MAX_RESET_WAIT 10000
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#define MAX_TX_WAIT 10000
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#define RX_NUM_DESC 2
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#define TX_NUM_DESC 2
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#define RX_BUF_SIZE 32
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#define TX_BUF_SIZE 32
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static struct mv64x60_rx_desc rd[2][RX_NUM_DESC] __attribute__ ((aligned(32)));
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static struct mv64x60_tx_desc td[2][TX_NUM_DESC] __attribute__ ((aligned(32)));
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static char rx_buf[2][RX_NUM_DESC * RX_BUF_SIZE] __attribute__ ((aligned(32)));
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static char tx_buf[2][TX_NUM_DESC * TX_BUF_SIZE] __attribute__ ((aligned(32)));
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static int cur_rd[2] = { 0, 0 };
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static int cur_td[2] = { 0, 0 };
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static char chan_initialized[2] = { 0, 0 };
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#define RX_INIT_RDP(rdp) { \
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(rdp)->bufsize = 2; \
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(rdp)->bytecnt = 0; \
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(rdp)->cmd_stat = SDMA_DESC_CMDSTAT_L | SDMA_DESC_CMDSTAT_F | \
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SDMA_DESC_CMDSTAT_O; \
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}
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#ifdef CONFIG_MV64360
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static u32 cpu2mem_tab[MV64x60_CPU2MEM_WINDOWS][2] = {
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{ MV64x60_CPU2MEM_0_BASE, MV64x60_CPU2MEM_0_SIZE },
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{ MV64x60_CPU2MEM_1_BASE, MV64x60_CPU2MEM_1_SIZE },
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{ MV64x60_CPU2MEM_2_BASE, MV64x60_CPU2MEM_2_SIZE },
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{ MV64x60_CPU2MEM_3_BASE, MV64x60_CPU2MEM_3_SIZE }
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};
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static u32 com2mem_tab[MV64x60_CPU2MEM_WINDOWS][2] = {
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{ MV64360_MPSC2MEM_0_BASE, MV64360_MPSC2MEM_0_SIZE },
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{ MV64360_MPSC2MEM_1_BASE, MV64360_MPSC2MEM_1_SIZE },
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{ MV64360_MPSC2MEM_2_BASE, MV64360_MPSC2MEM_2_SIZE },
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{ MV64360_MPSC2MEM_3_BASE, MV64360_MPSC2MEM_3_SIZE }
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};
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static u32 dram_selects[MV64x60_CPU2MEM_WINDOWS] = { 0xe, 0xd, 0xb, 0x7 };
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#endif
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unsigned long
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serial_init(int chan, void *ignored)
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{
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u32 mpsc_routing_base, sdma_base, brg_bcr, cdv;
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int i;
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chan = (chan == 1); /* default to chan 0 if anything but 1 */
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if (chan_initialized[chan])
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return chan;
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chan_initialized[chan] = 1;
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if (chan == 0) {
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sdma_base = MV64x60_SDMA_0_OFFSET;
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brg_bcr = MV64x60_BRG_0_OFFSET + BRG_BCR;
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SDMA_REGS_INIT(&sdma_regs[0], MV64x60_SDMA_0_OFFSET);
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} else {
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sdma_base = MV64x60_SDMA_1_OFFSET;
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brg_bcr = MV64x60_BRG_1_OFFSET + BRG_BCR;
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SDMA_REGS_INIT(&sdma_regs[0], MV64x60_SDMA_1_OFFSET);
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}
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mpsc_routing_base = MV64x60_MPSC_ROUTING_OFFSET;
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stop_dma(chan);
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/* Set up ring buffers */
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for (i=0; i<RX_NUM_DESC; i++) {
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RX_INIT_RDP(&rd[chan][i]);
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rd[chan][i].buffer = (u32)&rx_buf[chan][i * RX_BUF_SIZE];
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rd[chan][i].next_desc_ptr = (u32)&rd[chan][i+1];
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}
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rd[chan][RX_NUM_DESC - 1].next_desc_ptr = (u32)&rd[chan][0];
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for (i=0; i<TX_NUM_DESC; i++) {
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td[chan][i].bytecnt = 0;
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td[chan][i].shadow = 0;
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td[chan][i].buffer = (u32)&tx_buf[chan][i * TX_BUF_SIZE];
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td[chan][i].cmd_stat = SDMA_DESC_CMDSTAT_F|SDMA_DESC_CMDSTAT_L;
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td[chan][i].next_desc_ptr = (u32)&td[chan][i+1];
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}
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td[chan][TX_NUM_DESC - 1].next_desc_ptr = (u32)&td[chan][0];
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/* Set MPSC Routing */
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out_le32(mv64x60_base + mpsc_routing_base + MPSC_MRR, 0x3ffffe38);
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#ifdef CONFIG_GT64260
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out_le32(mv64x60_base + GT64260_MPP_SERIAL_PORTS_MULTIPLEX, 0x00001102);
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#else /* Must be MV64360 or MV64460 */
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{
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u32 enables, prot_bits, v;
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/* Set up comm unit to memory mapping windows */
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/* Note: Assumes MV64x60_CPU2MEM_WINDOWS == 4 */
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enables = in_le32(mv64x60_base + MV64360_CPU_BAR_ENABLE) & 0xf;
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prot_bits = 0;
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for (i=0; i<MV64x60_CPU2MEM_WINDOWS; i++) {
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if (!(enables & (1 << i))) {
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v = in_le32(mv64x60_base + cpu2mem_tab[i][0]);
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v = ((v & 0xffff) << 16) | (dram_selects[i] << 8);
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out_le32(mv64x60_base + com2mem_tab[i][0], v);
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v = in_le32(mv64x60_base + cpu2mem_tab[i][1]);
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v = (v & 0xffff) << 16;
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out_le32(mv64x60_base + com2mem_tab[i][1], v);
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prot_bits |= (0x3 << (i << 1)); /* r/w access */
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}
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}
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out_le32(mv64x60_base + MV64360_MPSC_0_REMAP, 0);
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out_le32(mv64x60_base + MV64360_MPSC_1_REMAP, 0);
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out_le32(mv64x60_base + MV64360_MPSC2MEM_ACC_PROT_0, prot_bits);
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out_le32(mv64x60_base + MV64360_MPSC2MEM_ACC_PROT_1, prot_bits);
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out_le32(mv64x60_base + MV64360_MPSC2MEM_BAR_ENABLE, enables);
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}
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#endif
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/* MPSC 0/1 Rx & Tx get clocks BRG0/1 */
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out_le32(mv64x60_base + mpsc_routing_base + MPSC_RCRR, 0x00000100);
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out_le32(mv64x60_base + mpsc_routing_base + MPSC_TCRR, 0x00000100);
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/* clear pending interrupts */
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out_le32(mv64x60_base + MV64x60_SDMA_INTR_OFFSET + SDMA_INTR_MASK, 0);
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out_le32(mv64x60_base + SDMA_SCRDP + sdma_base, (int)&rd[chan][0]);
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out_le32(mv64x60_base + SDMA_SCTDP + sdma_base,
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(int)&td[chan][TX_NUM_DESC - 1]);
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out_le32(mv64x60_base + SDMA_SFTDP + sdma_base,
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(int)&td[chan][TX_NUM_DESC - 1]);
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out_le32(mv64x60_base + SDMA_SDC + sdma_base,
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SDMA_SDC_RFT | SDMA_SDC_SFM | SDMA_SDC_BLMR | SDMA_SDC_BLMT |
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(3 << 12));
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cdv = ((mv64x60_mpsc_clk_freq/(32*mv64x60_console_baud))-1);
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out_le32(mv64x60_base + brg_bcr,
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((mv64x60_mpsc_clk_src << 18) | (1 << 16) | cdv));
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/* Put MPSC into UART mode, no null modem, 16x clock mode */
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out_le32(mv64x60_base + MPSC_MMCRL + mpsc_base[chan], 0x000004c4);
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out_le32(mv64x60_base + MPSC_MMCRH + mpsc_base[chan], 0x04400400);
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out_le32(mv64x60_base + MPSC_CHR_1 + mpsc_base[chan], 0);
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out_le32(mv64x60_base + MPSC_CHR_9 + mpsc_base[chan], 0);
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out_le32(mv64x60_base + MPSC_CHR_10 + mpsc_base[chan], 0);
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out_le32(mv64x60_base + MPSC_CHR_3 + mpsc_base[chan], 4);
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out_le32(mv64x60_base + MPSC_CHR_4 + mpsc_base[chan], 0);
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out_le32(mv64x60_base + MPSC_CHR_5 + mpsc_base[chan], 0);
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out_le32(mv64x60_base + MPSC_CHR_6 + mpsc_base[chan], 0);
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out_le32(mv64x60_base + MPSC_CHR_7 + mpsc_base[chan], 0);
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out_le32(mv64x60_base + MPSC_CHR_8 + mpsc_base[chan], 0);
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/* 8 data bits, 1 stop bit */
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out_le32(mv64x60_base + MPSC_MPCR + mpsc_base[chan], (3 << 12));
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out_le32(mv64x60_base + SDMA_SDCM + sdma_base, SDMA_SDCM_ERD);
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out_le32(mv64x60_base + MPSC_CHR_2 + mpsc_base[chan], MPSC_CHR_2_EH);
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udelay(100);
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return chan;
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}
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static void
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stop_dma(int chan)
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{
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int i;
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/* Abort MPSC Rx (aborting Tx messes things up) */
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out_le32(mv64x60_base + MPSC_CHR_2 + mpsc_base[chan], MPSC_CHR_2_RA);
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/* Abort SDMA Rx, Tx */
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out_le32(mv64x60_base + sdma_regs[chan].sdcm,
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SDMA_SDCM_AR | SDMA_SDCM_STD);
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for (i=0; i<MAX_RESET_WAIT; i++) {
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if ((in_le32(mv64x60_base + sdma_regs[chan].sdcm) &
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(SDMA_SDCM_AR | SDMA_SDCM_AT)) == 0)
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break;
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udelay(100);
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}
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}
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static int
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wait_for_ownership(int chan)
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{
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int i;
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for (i=0; i<MAX_TX_WAIT; i++) {
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if ((in_le32(mv64x60_base + sdma_regs[chan].sdcm) &
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SDMA_SDCM_TXD) == 0)
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break;
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udelay(1000);
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}
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return (i < MAX_TX_WAIT);
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}
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void
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serial_putc(unsigned long com_port, unsigned char c)
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{
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struct mv64x60_tx_desc *tdp;
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if (wait_for_ownership(com_port) == 0)
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return;
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tdp = &td[com_port][cur_td[com_port]];
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if (++cur_td[com_port] >= TX_NUM_DESC)
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cur_td[com_port] = 0;
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*(unchar *)(tdp->buffer ^ 7) = c;
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tdp->bytecnt = 1;
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tdp->shadow = 1;
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tdp->cmd_stat = SDMA_DESC_CMDSTAT_L | SDMA_DESC_CMDSTAT_F |
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SDMA_DESC_CMDSTAT_O;
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out_le32(mv64x60_base + sdma_regs[com_port].sctdp, (int)tdp);
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out_le32(mv64x60_base + sdma_regs[com_port].sftdp, (int)tdp);
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out_le32(mv64x60_base + sdma_regs[com_port].sdcm,
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in_le32(mv64x60_base + sdma_regs[com_port].sdcm) |
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SDMA_SDCM_TXD);
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}
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unsigned char
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serial_getc(unsigned long com_port)
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{
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struct mv64x60_rx_desc *rdp;
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unchar c = '\0';
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rdp = &rd[com_port][cur_rd[com_port]];
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if ((rdp->cmd_stat & (SDMA_DESC_CMDSTAT_O|SDMA_DESC_CMDSTAT_ES)) == 0) {
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c = *(unchar *)(rdp->buffer ^ 7);
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RX_INIT_RDP(rdp);
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if (++cur_rd[com_port] >= RX_NUM_DESC)
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cur_rd[com_port] = 0;
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}
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return c;
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}
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int
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serial_tstc(unsigned long com_port)
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{
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struct mv64x60_rx_desc *rdp;
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int loop_count = 0;
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int rc = 0;
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rdp = &rd[com_port][cur_rd[com_port]];
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/* Go through rcv descs until empty looking for one with data (no error)*/
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while (((rdp->cmd_stat & SDMA_DESC_CMDSTAT_O) == 0) &&
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(loop_count++ < RX_NUM_DESC)) {
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/* If there was an error, reinit the desc & continue */
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if ((rdp->cmd_stat & SDMA_DESC_CMDSTAT_ES) != 0) {
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RX_INIT_RDP(rdp);
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if (++cur_rd[com_port] >= RX_NUM_DESC)
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cur_rd[com_port] = 0;
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rdp = (struct mv64x60_rx_desc *)rdp->next_desc_ptr;
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} else {
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rc = 1;
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break;
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}
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}
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return rc;
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}
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void
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serial_close(unsigned long com_port)
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{
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stop_dma(com_port);
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}
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