diff options
Diffstat (limited to 'arch/ppc/boot/simple/mv64x60_tty.c')
| -rw-r--r-- | arch/ppc/boot/simple/mv64x60_tty.c | 364 |
1 files changed, 0 insertions, 364 deletions
diff --git a/arch/ppc/boot/simple/mv64x60_tty.c b/arch/ppc/boot/simple/mv64x60_tty.c deleted file mode 100644 index 8a735787a6e9..000000000000 --- a/arch/ppc/boot/simple/mv64x60_tty.c +++ /dev/null @@ -1,364 +0,0 @@ -/* - * 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/types.h> -#include <linux/serial_reg.h> -#include <asm/serial.h> -#include <asm/io.h> -#include <asm/mv64x60_defs.h> -#include <mpsc_defs.h> - -#ifdef CONFIG_EV64360 -#include <platforms/ev64360.h> -u32 mv64x60_console_baud = EV64360_DEFAULT_BAUD; -u32 mv64x60_mpsc_clk_src = EV64360_MPSC_CLK_SRC; /* TCLK */ -u32 mv64x60_mpsc_clk_freq = EV64360_MPSC_CLK_FREQ; -#else -u32 mv64x60_console_baud = 9600; -u32 mv64x60_mpsc_clk_src = 8; /* TCLK */ -u32 mv64x60_mpsc_clk_freq = 100000000; -#endif - -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 through rcv descs 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); -} |