diff options
Diffstat (limited to 'arch/ppc/boot/simple/mv64x60_tty.c')
| -rw-r--r-- | arch/ppc/boot/simple/mv64x60_tty.c | 360 |
1 files changed, 360 insertions, 0 deletions
diff --git a/arch/ppc/boot/simple/mv64x60_tty.c b/arch/ppc/boot/simple/mv64x60_tty.c new file mode 100644 index 00000000000..5b45eb46b66 --- /dev/null +++ b/arch/ppc/boot/simple/mv64x60_tty.c @@ -0,0 +1,360 @@ +/* + * arch/ppc/boot/simple/mv64x60_tty.c + * + * Bootloader version of the embedded MPSC/UART driver for the Marvell 64x60. + * Note: Due to a GT64260A erratum, DMA will be used for UART input (via SDMA). + * + * Author: Mark A. Greer <mgreer@mvista.com> + * + * 2001 (c) MontaVista Software, Inc. This file is licensed under + * the terms of the GNU General Public License version 2. This program + * is licensed "as is" without any warranty of any kind, whether express + * or implied. + */ + +/* This code assumes that the data cache has been disabled (L1, L2, L3). */ + +#include <linux/config.h> +#include <linux/types.h> +#include <linux/serial_reg.h> +#include <asm/serial.h> +#include <asm/io.h> +#include <asm/mv64x60_defs.h> +#include <mpsc_defs.h> + +u32 mv64x60_console_baud = 9600; +u32 mv64x60_mpsc_clk_src = 8; /* TCLK */ +u32 mv64x60_mpsc_clk_freq = 100000000; + +extern void udelay(long); +static void stop_dma(int chan); + +static void __iomem *mv64x60_base = (void __iomem *)CONFIG_MV64X60_NEW_BASE; + +struct sdma_regs { + u32 sdc; + u32 sdcm; + u32 rx_desc; + u32 rx_buf_ptr; + u32 scrdp; + u32 tx_desc; + u32 sctdp; + u32 sftdp; +}; + +static struct sdma_regs sdma_regs[2]; + +#define SDMA_REGS_INIT(s, reg_base) { \ + (s)->sdc = (reg_base) + SDMA_SDC; \ + (s)->sdcm = (reg_base) + SDMA_SDCM; \ + (s)->rx_desc = (reg_base) + SDMA_RX_DESC; \ + (s)->rx_buf_ptr = (reg_base) + SDMA_RX_BUF_PTR; \ + (s)->scrdp = (reg_base) + SDMA_SCRDP; \ + (s)->tx_desc = (reg_base) + SDMA_TX_DESC; \ + (s)->sctdp = (reg_base) + SDMA_SCTDP; \ + (s)->sftdp = (reg_base) + SDMA_SFTDP; \ +} + +static u32 mpsc_base[2] = { MV64x60_MPSC_0_OFFSET, MV64x60_MPSC_1_OFFSET }; + +struct mv64x60_rx_desc { + u16 bufsize; + u16 bytecnt; + u32 cmd_stat; + u32 next_desc_ptr; + u32 buffer; +}; + +struct mv64x60_tx_desc { + u16 bytecnt; + u16 shadow; + u32 cmd_stat; + u32 next_desc_ptr; + u32 buffer; +}; + +#define MAX_RESET_WAIT 10000 +#define MAX_TX_WAIT 10000 + +#define RX_NUM_DESC 2 +#define TX_NUM_DESC 2 + +#define RX_BUF_SIZE 32 +#define TX_BUF_SIZE 32 + +static struct mv64x60_rx_desc rd[2][RX_NUM_DESC] __attribute__ ((aligned(32))); +static struct mv64x60_tx_desc td[2][TX_NUM_DESC] __attribute__ ((aligned(32))); + +static char rx_buf[2][RX_NUM_DESC * RX_BUF_SIZE] __attribute__ ((aligned(32))); +static char tx_buf[2][TX_NUM_DESC * TX_BUF_SIZE] __attribute__ ((aligned(32))); + +static int cur_rd[2] = { 0, 0 }; +static int cur_td[2] = { 0, 0 }; + +static char chan_initialized[2] = { 0, 0 }; + + +#define RX_INIT_RDP(rdp) { \ + (rdp)->bufsize = 2; \ + (rdp)->bytecnt = 0; \ + (rdp)->cmd_stat = SDMA_DESC_CMDSTAT_L | SDMA_DESC_CMDSTAT_F | \ + SDMA_DESC_CMDSTAT_O; \ +} + +#ifdef CONFIG_MV64360 +static u32 cpu2mem_tab[MV64x60_CPU2MEM_WINDOWS][2] = { + { MV64x60_CPU2MEM_0_BASE, MV64x60_CPU2MEM_0_SIZE }, + { MV64x60_CPU2MEM_1_BASE, MV64x60_CPU2MEM_1_SIZE }, + { MV64x60_CPU2MEM_2_BASE, MV64x60_CPU2MEM_2_SIZE }, + { MV64x60_CPU2MEM_3_BASE, MV64x60_CPU2MEM_3_SIZE } +}; + +static u32 com2mem_tab[MV64x60_CPU2MEM_WINDOWS][2] = { + { MV64360_MPSC2MEM_0_BASE, MV64360_MPSC2MEM_0_SIZE }, + { MV64360_MPSC2MEM_1_BASE, MV64360_MPSC2MEM_1_SIZE }, + { MV64360_MPSC2MEM_2_BASE, MV64360_MPSC2MEM_2_SIZE }, + { MV64360_MPSC2MEM_3_BASE, MV64360_MPSC2MEM_3_SIZE } +}; + +static u32 dram_selects[MV64x60_CPU2MEM_WINDOWS] = { 0xe, 0xd, 0xb, 0x7 }; +#endif + +unsigned long +serial_init(int chan, void *ignored) +{ + u32 mpsc_routing_base, sdma_base, brg_bcr, cdv; + int i; + + chan = (chan == 1); /* default to chan 0 if anything but 1 */ + + if (chan_initialized[chan]) + return chan; + + chan_initialized[chan] = 1; + + if (chan == 0) { + sdma_base = MV64x60_SDMA_0_OFFSET; + brg_bcr = MV64x60_BRG_0_OFFSET + BRG_BCR; + SDMA_REGS_INIT(&sdma_regs[0], MV64x60_SDMA_0_OFFSET); + } else { + sdma_base = MV64x60_SDMA_1_OFFSET; + brg_bcr = MV64x60_BRG_1_OFFSET + BRG_BCR; + SDMA_REGS_INIT(&sdma_regs[0], MV64x60_SDMA_1_OFFSET); + } + + mpsc_routing_base = MV64x60_MPSC_ROUTING_OFFSET; + + stop_dma(chan); + + /* Set up ring buffers */ + for (i=0; i<RX_NUM_DESC; i++) { + RX_INIT_RDP(&rd[chan][i]); + rd[chan][i].buffer = (u32)&rx_buf[chan][i * RX_BUF_SIZE]; + rd[chan][i].next_desc_ptr = (u32)&rd[chan][i+1]; + } + rd[chan][RX_NUM_DESC - 1].next_desc_ptr = (u32)&rd[chan][0]; + + for (i=0; i<TX_NUM_DESC; i++) { + td[chan][i].bytecnt = 0; + td[chan][i].shadow = 0; + td[chan][i].buffer = (u32)&tx_buf[chan][i * TX_BUF_SIZE]; + td[chan][i].cmd_stat = SDMA_DESC_CMDSTAT_F|SDMA_DESC_CMDSTAT_L; + td[chan][i].next_desc_ptr = (u32)&td[chan][i+1]; + } + td[chan][TX_NUM_DESC - 1].next_desc_ptr = (u32)&td[chan][0]; + + /* Set MPSC Routing */ + out_le32(mv64x60_base + mpsc_routing_base + MPSC_MRR, 0x3ffffe38); + +#ifdef CONFIG_GT64260 + out_le32(mv64x60_base + GT64260_MPP_SERIAL_PORTS_MULTIPLEX, 0x00001102); +#else /* Must be MV64360 or MV64460 */ + { + u32 enables, prot_bits, v; + + /* Set up comm unit to memory mapping windows */ + /* Note: Assumes MV64x60_CPU2MEM_WINDOWS == 4 */ + + enables = in_le32(mv64x60_base + MV64360_CPU_BAR_ENABLE) & 0xf; + prot_bits = 0; + + for (i=0; i<MV64x60_CPU2MEM_WINDOWS; i++) { + if (!(enables & (1 << i))) { + v = in_le32(mv64x60_base + cpu2mem_tab[i][0]); + v = ((v & 0xffff) << 16) | (dram_selects[i] << 8); + out_le32(mv64x60_base + com2mem_tab[i][0], v); + + v = in_le32(mv64x60_base + cpu2mem_tab[i][1]); + v = (v & 0xffff) << 16; + out_le32(mv64x60_base + com2mem_tab[i][1], v); + + prot_bits |= (0x3 << (i << 1)); /* r/w access */ + } + } + + out_le32(mv64x60_base + MV64360_MPSC_0_REMAP, 0); + out_le32(mv64x60_base + MV64360_MPSC_1_REMAP, 0); + out_le32(mv64x60_base + MV64360_MPSC2MEM_ACC_PROT_0, prot_bits); + out_le32(mv64x60_base + MV64360_MPSC2MEM_ACC_PROT_1, prot_bits); + out_le32(mv64x60_base + MV64360_MPSC2MEM_BAR_ENABLE, enables); + } +#endif + + /* MPSC 0/1 Rx & Tx get clocks BRG0/1 */ + out_le32(mv64x60_base + mpsc_routing_base + MPSC_RCRR, 0x00000100); + out_le32(mv64x60_base + mpsc_routing_base + MPSC_TCRR, 0x00000100); + + /* clear pending interrupts */ + out_le32(mv64x60_base + MV64x60_SDMA_INTR_OFFSET + SDMA_INTR_MASK, 0); + + out_le32(mv64x60_base + SDMA_SCRDP + sdma_base, (int)&rd[chan][0]); + out_le32(mv64x60_base + SDMA_SCTDP + sdma_base, + (int)&td[chan][TX_NUM_DESC - 1]); + out_le32(mv64x60_base + SDMA_SFTDP + sdma_base, + (int)&td[chan][TX_NUM_DESC - 1]); + + out_le32(mv64x60_base + SDMA_SDC + sdma_base, + SDMA_SDC_RFT | SDMA_SDC_SFM | SDMA_SDC_BLMR | SDMA_SDC_BLMT | + (3 << 12)); + + cdv = ((mv64x60_mpsc_clk_freq/(32*mv64x60_console_baud))-1); + out_le32(mv64x60_base + brg_bcr, + ((mv64x60_mpsc_clk_src << 18) | (1 << 16) | cdv)); + + /* Put MPSC into UART mode, no null modem, 16x clock mode */ + out_le32(mv64x60_base + MPSC_MMCRL + mpsc_base[chan], 0x000004c4); + out_le32(mv64x60_base + MPSC_MMCRH + mpsc_base[chan], 0x04400400); + + out_le32(mv64x60_base + MPSC_CHR_1 + mpsc_base[chan], 0); + out_le32(mv64x60_base + MPSC_CHR_9 + mpsc_base[chan], 0); + out_le32(mv64x60_base + MPSC_CHR_10 + mpsc_base[chan], 0); + out_le32(mv64x60_base + MPSC_CHR_3 + mpsc_base[chan], 4); + out_le32(mv64x60_base + MPSC_CHR_4 + mpsc_base[chan], 0); + out_le32(mv64x60_base + MPSC_CHR_5 + mpsc_base[chan], 0); + out_le32(mv64x60_base + MPSC_CHR_6 + mpsc_base[chan], 0); + out_le32(mv64x60_base + MPSC_CHR_7 + mpsc_base[chan], 0); + out_le32(mv64x60_base + MPSC_CHR_8 + mpsc_base[chan], 0); + + /* 8 data bits, 1 stop bit */ + out_le32(mv64x60_base + MPSC_MPCR + mpsc_base[chan], (3 << 12)); + out_le32(mv64x60_base + SDMA_SDCM + sdma_base, SDMA_SDCM_ERD); + out_le32(mv64x60_base + MPSC_CHR_2 + mpsc_base[chan], MPSC_CHR_2_EH); + + udelay(100); + + return chan; +} + +static void +stop_dma(int chan) +{ + int i; + + /* Abort MPSC Rx (aborting Tx messes things up) */ + out_le32(mv64x60_base + MPSC_CHR_2 + mpsc_base[chan], MPSC_CHR_2_RA); + + /* Abort SDMA Rx, Tx */ + out_le32(mv64x60_base + sdma_regs[chan].sdcm, + SDMA_SDCM_AR | SDMA_SDCM_STD); + + for (i=0; i<MAX_RESET_WAIT; i++) { + if ((in_le32(mv64x60_base + sdma_regs[chan].sdcm) & + (SDMA_SDCM_AR | SDMA_SDCM_AT)) == 0) + break; + + udelay(100); + } +} + +static int +wait_for_ownership(int chan) +{ + int i; + + for (i=0; i<MAX_TX_WAIT; i++) { + if ((in_le32(mv64x60_base + sdma_regs[chan].sdcm) & + SDMA_SDCM_TXD) == 0) + break; + + udelay(1000); + } + + return (i < MAX_TX_WAIT); +} + +void +serial_putc(unsigned long com_port, unsigned char c) +{ + struct mv64x60_tx_desc *tdp; + + if (wait_for_ownership(com_port) == 0) + return; + + tdp = &td[com_port][cur_td[com_port]]; + if (++cur_td[com_port] >= TX_NUM_DESC) + cur_td[com_port] = 0; + + *(unchar *)(tdp->buffer ^ 7) = c; + tdp->bytecnt = 1; + tdp->shadow = 1; + tdp->cmd_stat = SDMA_DESC_CMDSTAT_L | SDMA_DESC_CMDSTAT_F | + SDMA_DESC_CMDSTAT_O; + + out_le32(mv64x60_base + sdma_regs[com_port].sctdp, (int)tdp); + out_le32(mv64x60_base + sdma_regs[com_port].sftdp, (int)tdp); + out_le32(mv64x60_base + sdma_regs[com_port].sdcm, + in_le32(mv64x60_base + sdma_regs[com_port].sdcm) | + SDMA_SDCM_TXD); +} + +unsigned char +serial_getc(unsigned long com_port) +{ + struct mv64x60_rx_desc *rdp; + unchar c = '\0'; + + rdp = &rd[com_port][cur_rd[com_port]]; + + if ((rdp->cmd_stat & (SDMA_DESC_CMDSTAT_O|SDMA_DESC_CMDSTAT_ES)) == 0) { + c = *(unchar *)(rdp->buffer ^ 7); + RX_INIT_RDP(rdp); + if (++cur_rd[com_port] >= RX_NUM_DESC) + cur_rd[com_port] = 0; + } + + return c; +} + +int +serial_tstc(unsigned long com_port) +{ + struct mv64x60_rx_desc *rdp; + int loop_count = 0; + int rc = 0; + + rdp = &rd[com_port][cur_rd[com_port]]; + + /* Go thru rcv desc's until empty looking for one with data (no error)*/ + while (((rdp->cmd_stat & SDMA_DESC_CMDSTAT_O) == 0) && + (loop_count++ < RX_NUM_DESC)) { + + /* If there was an error, reinit the desc & continue */ + if ((rdp->cmd_stat & SDMA_DESC_CMDSTAT_ES) != 0) { + RX_INIT_RDP(rdp); + if (++cur_rd[com_port] >= RX_NUM_DESC) + cur_rd[com_port] = 0; + rdp = (struct mv64x60_rx_desc *)rdp->next_desc_ptr; + } else { + rc = 1; + break; + } + } + + return rc; +} + +void +serial_close(unsigned long com_port) +{ + stop_dma(com_port); +} |