2 * drivers/serial/mpsc.c
4 * Generic driver for the MPSC (UART mode) on Marvell parts (e.g., GT64240,
5 * GT64260, MV64340, MV64360, GT96100, ... ).
7 * Author: Mark A. Greer <mgreer@mvista.com>
9 * Based on an old MPSC driver that was in the linuxppc tree. It appears to
10 * have been created by Chris Zankel (formerly of MontaVista) but there
11 * is no proper Copyright so I'm not sure. Apparently, parts were also
12 * taken from PPCBoot (now U-Boot). Also based on drivers/serial/8250.c
15 * 2004 (c) MontaVista, Software, Inc. This file is licensed under
16 * the terms of the GNU General Public License version 2. This program
17 * is licensed "as is" without any warranty of any kind, whether express
21 * The MPSC interface is much like a typical network controller's interface.
22 * That is, you set up separate rings of descriptors for transmitting and
23 * receiving data. There is also a pool of buffers with (one buffer per
24 * descriptor) that incoming data are dma'd into or outgoing data are dma'd
27 * The MPSC requires two other controllers to be able to work. The Baud Rate
28 * Generator (BRG) provides a clock at programmable frequencies which determines
29 * the baud rate. The Serial DMA Controller (SDMA) takes incoming data from the
30 * MPSC and DMA's it into memory or DMA's outgoing data and passes it to the
31 * MPSC. It is actually the SDMA interrupt that the driver uses to keep the
32 * transmit and receive "engines" going (i.e., indicate data has been
33 * transmitted or received).
37 * 1) Some chips have an erratum where several regs cannot be
38 * read. To work around that, we keep a local copy of those regs in
41 * 2) Some chips have an erratum where the ctlr will hang when the SDMA ctlr
42 * accesses system mem with coherency enabled. For that reason, the driver
43 * assumes that coherency for that ctlr has been disabled. This means
44 * that when in a cache coherent system, the driver has to manually manage
45 * the data cache on the areas that it touches because the dma_* macro are
48 * 3) There is an erratum (on PPC) where you can't use the instruction to do
49 * a DMA_TO_DEVICE/cache clean so DMA_BIDIRECTIONAL/flushes are used in places
50 * where a DMA_TO_DEVICE/clean would have [otherwise] sufficed.
52 * 4) AFAICT, hardware flow control isn't supported by the controller --MAG.
55 #include <linux/platform_device.h>
60 * Define how this driver is known to the outside (we've been assigned a
61 * range on the "Low-density serial ports" major).
63 #define MPSC_MAJOR 204
64 #define MPSC_MINOR_START 44
65 #define MPSC_DRIVER_NAME "MPSC"
66 #define MPSC_DEVFS_NAME "ttymm/"
67 #define MPSC_DEV_NAME "ttyMM"
68 #define MPSC_VERSION "1.00"
70 static struct mpsc_port_info mpsc_ports[MPSC_NUM_CTLRS];
71 static struct mpsc_shared_regs mpsc_shared_regs;
72 static struct uart_driver mpsc_reg;
74 static void mpsc_start_rx(struct mpsc_port_info *pi);
75 static void mpsc_free_ring_mem(struct mpsc_port_info *pi);
76 static void mpsc_release_port(struct uart_port *port);
78 ******************************************************************************
80 * Baud Rate Generator Routines (BRG)
82 ******************************************************************************
85 mpsc_brg_init(struct mpsc_port_info *pi, u32 clk_src)
89 v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
90 v = (v & ~(0xf << 18)) | ((clk_src & 0xf) << 18);
97 writel(v, pi->brg_base + BRG_BCR);
99 writel(readl(pi->brg_base + BRG_BTR) & 0xffff0000,
100 pi->brg_base + BRG_BTR);
105 mpsc_brg_enable(struct mpsc_port_info *pi)
109 v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
114 writel(v, pi->brg_base + BRG_BCR);
119 mpsc_brg_disable(struct mpsc_port_info *pi)
123 v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
128 writel(v, pi->brg_base + BRG_BCR);
133 mpsc_set_baudrate(struct mpsc_port_info *pi, u32 baud)
136 * To set the baud, we adjust the CDV field in the BRG_BCR reg.
137 * From manual: Baud = clk / ((CDV+1)*2) ==> CDV = (clk / (baud*2)) - 1.
138 * However, the input clock is divided by 16 in the MPSC b/c of how
139 * 'MPSC_MMCRH' was set up so we have to divide the 'clk' used in our
140 * calculation by 16 to account for that. So the real calculation
141 * that accounts for the way the mpsc is set up is:
142 * CDV = (clk / (baud*2*16)) - 1 ==> CDV = (clk / (baud << 5)) - 1.
144 u32 cdv = (pi->port.uartclk / (baud << 5)) - 1;
147 mpsc_brg_disable(pi);
148 v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
149 v = (v & 0xffff0000) | (cdv & 0xffff);
153 writel(v, pi->brg_base + BRG_BCR);
160 ******************************************************************************
162 * Serial DMA Routines (SDMA)
164 ******************************************************************************
168 mpsc_sdma_burstsize(struct mpsc_port_info *pi, u32 burst_size)
172 pr_debug("mpsc_sdma_burstsize[%d]: burst_size: %d\n",
173 pi->port.line, burst_size);
175 burst_size >>= 3; /* Divide by 8 b/c reg values are 8-byte chunks */
178 v = 0x0; /* 1 64-bit word */
179 else if (burst_size < 4)
180 v = 0x1; /* 2 64-bit words */
181 else if (burst_size < 8)
182 v = 0x2; /* 4 64-bit words */
184 v = 0x3; /* 8 64-bit words */
186 writel((readl(pi->sdma_base + SDMA_SDC) & (0x3 << 12)) | (v << 12),
187 pi->sdma_base + SDMA_SDC);
192 mpsc_sdma_init(struct mpsc_port_info *pi, u32 burst_size)
194 pr_debug("mpsc_sdma_init[%d]: burst_size: %d\n", pi->port.line,
197 writel((readl(pi->sdma_base + SDMA_SDC) & 0x3ff) | 0x03f,
198 pi->sdma_base + SDMA_SDC);
199 mpsc_sdma_burstsize(pi, burst_size);
204 mpsc_sdma_intr_mask(struct mpsc_port_info *pi, u32 mask)
208 pr_debug("mpsc_sdma_intr_mask[%d]: mask: 0x%x\n", pi->port.line, mask);
210 old = v = (pi->mirror_regs) ? pi->shared_regs->SDMA_INTR_MASK_m :
211 readl(pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
219 pi->shared_regs->SDMA_INTR_MASK_m = v;
220 writel(v, pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
228 mpsc_sdma_intr_unmask(struct mpsc_port_info *pi, u32 mask)
232 pr_debug("mpsc_sdma_intr_unmask[%d]: mask: 0x%x\n", pi->port.line,mask);
234 v = (pi->mirror_regs) ? pi->shared_regs->SDMA_INTR_MASK_m :
235 readl(pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
243 pi->shared_regs->SDMA_INTR_MASK_m = v;
244 writel(v, pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
249 mpsc_sdma_intr_ack(struct mpsc_port_info *pi)
251 pr_debug("mpsc_sdma_intr_ack[%d]: Acknowledging IRQ\n", pi->port.line);
254 pi->shared_regs->SDMA_INTR_CAUSE_m = 0;
255 writel(0, pi->shared_regs->sdma_intr_base + SDMA_INTR_CAUSE);
260 mpsc_sdma_set_rx_ring(struct mpsc_port_info *pi, struct mpsc_rx_desc *rxre_p)
262 pr_debug("mpsc_sdma_set_rx_ring[%d]: rxre_p: 0x%x\n",
263 pi->port.line, (u32) rxre_p);
265 writel((u32)rxre_p, pi->sdma_base + SDMA_SCRDP);
270 mpsc_sdma_set_tx_ring(struct mpsc_port_info *pi, struct mpsc_tx_desc *txre_p)
272 writel((u32)txre_p, pi->sdma_base + SDMA_SFTDP);
273 writel((u32)txre_p, pi->sdma_base + SDMA_SCTDP);
278 mpsc_sdma_cmd(struct mpsc_port_info *pi, u32 val)
282 v = readl(pi->sdma_base + SDMA_SDCM);
288 writel(v, pi->sdma_base + SDMA_SDCM);
294 mpsc_sdma_tx_active(struct mpsc_port_info *pi)
296 return readl(pi->sdma_base + SDMA_SDCM) & SDMA_SDCM_TXD;
300 mpsc_sdma_start_tx(struct mpsc_port_info *pi)
302 struct mpsc_tx_desc *txre, *txre_p;
304 /* If tx isn't running & there's a desc ready to go, start it */
305 if (!mpsc_sdma_tx_active(pi)) {
306 txre = (struct mpsc_tx_desc *)(pi->txr +
307 (pi->txr_tail * MPSC_TXRE_SIZE));
308 dma_cache_sync((void *) txre, MPSC_TXRE_SIZE, DMA_FROM_DEVICE);
309 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
310 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
311 invalidate_dcache_range((ulong)txre,
312 (ulong)txre + MPSC_TXRE_SIZE);
315 if (be32_to_cpu(txre->cmdstat) & SDMA_DESC_CMDSTAT_O) {
316 txre_p = (struct mpsc_tx_desc *)(pi->txr_p +
320 mpsc_sdma_set_tx_ring(pi, txre_p);
321 mpsc_sdma_cmd(pi, SDMA_SDCM_STD | SDMA_SDCM_TXD);
329 mpsc_sdma_stop(struct mpsc_port_info *pi)
331 pr_debug("mpsc_sdma_stop[%d]: Stopping SDMA\n", pi->port.line);
333 /* Abort any SDMA transfers */
334 mpsc_sdma_cmd(pi, 0);
335 mpsc_sdma_cmd(pi, SDMA_SDCM_AR | SDMA_SDCM_AT);
337 /* Clear the SDMA current and first TX and RX pointers */
338 mpsc_sdma_set_tx_ring(pi, NULL);
339 mpsc_sdma_set_rx_ring(pi, NULL);
341 /* Disable interrupts */
342 mpsc_sdma_intr_mask(pi, 0xf);
343 mpsc_sdma_intr_ack(pi);
349 ******************************************************************************
351 * Multi-Protocol Serial Controller Routines (MPSC)
353 ******************************************************************************
357 mpsc_hw_init(struct mpsc_port_info *pi)
361 pr_debug("mpsc_hw_init[%d]: Initializing hardware\n", pi->port.line);
363 /* Set up clock routing */
364 if (pi->mirror_regs) {
365 v = pi->shared_regs->MPSC_MRR_m;
367 pi->shared_regs->MPSC_MRR_m = v;
368 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_MRR);
370 v = pi->shared_regs->MPSC_RCRR_m;
371 v = (v & ~0xf0f) | 0x100;
372 pi->shared_regs->MPSC_RCRR_m = v;
373 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_RCRR);
375 v = pi->shared_regs->MPSC_TCRR_m;
376 v = (v & ~0xf0f) | 0x100;
377 pi->shared_regs->MPSC_TCRR_m = v;
378 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_TCRR);
381 v = readl(pi->shared_regs->mpsc_routing_base + MPSC_MRR);
383 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_MRR);
385 v = readl(pi->shared_regs->mpsc_routing_base + MPSC_RCRR);
386 v = (v & ~0xf0f) | 0x100;
387 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_RCRR);
389 v = readl(pi->shared_regs->mpsc_routing_base + MPSC_TCRR);
390 v = (v & ~0xf0f) | 0x100;
391 writel(v, pi->shared_regs->mpsc_routing_base + MPSC_TCRR);
394 /* Put MPSC in UART mode & enabel Tx/Rx egines */
395 writel(0x000004c4, pi->mpsc_base + MPSC_MMCRL);
397 /* No preamble, 16x divider, low-latency, */
398 writel(0x04400400, pi->mpsc_base + MPSC_MMCRH);
400 if (pi->mirror_regs) {
401 pi->MPSC_CHR_1_m = 0;
402 pi->MPSC_CHR_2_m = 0;
404 writel(0, pi->mpsc_base + MPSC_CHR_1);
405 writel(0, pi->mpsc_base + MPSC_CHR_2);
406 writel(pi->mpsc_max_idle, pi->mpsc_base + MPSC_CHR_3);
407 writel(0, pi->mpsc_base + MPSC_CHR_4);
408 writel(0, pi->mpsc_base + MPSC_CHR_5);
409 writel(0, pi->mpsc_base + MPSC_CHR_6);
410 writel(0, pi->mpsc_base + MPSC_CHR_7);
411 writel(0, pi->mpsc_base + MPSC_CHR_8);
412 writel(0, pi->mpsc_base + MPSC_CHR_9);
413 writel(0, pi->mpsc_base + MPSC_CHR_10);
419 mpsc_enter_hunt(struct mpsc_port_info *pi)
421 pr_debug("mpsc_enter_hunt[%d]: Hunting...\n", pi->port.line);
423 if (pi->mirror_regs) {
424 writel(pi->MPSC_CHR_2_m | MPSC_CHR_2_EH,
425 pi->mpsc_base + MPSC_CHR_2);
426 /* Erratum prevents reading CHR_2 so just delay for a while */
430 writel(readl(pi->mpsc_base + MPSC_CHR_2) | MPSC_CHR_2_EH,
431 pi->mpsc_base + MPSC_CHR_2);
433 while (readl(pi->mpsc_base + MPSC_CHR_2) & MPSC_CHR_2_EH)
441 mpsc_freeze(struct mpsc_port_info *pi)
445 pr_debug("mpsc_freeze[%d]: Freezing\n", pi->port.line);
447 v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
448 readl(pi->mpsc_base + MPSC_MPCR);
453 writel(v, pi->mpsc_base + MPSC_MPCR);
458 mpsc_unfreeze(struct mpsc_port_info *pi)
462 v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
463 readl(pi->mpsc_base + MPSC_MPCR);
468 writel(v, pi->mpsc_base + MPSC_MPCR);
470 pr_debug("mpsc_unfreeze[%d]: Unfrozen\n", pi->port.line);
475 mpsc_set_char_length(struct mpsc_port_info *pi, u32 len)
479 pr_debug("mpsc_set_char_length[%d]: char len: %d\n", pi->port.line,len);
481 v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
482 readl(pi->mpsc_base + MPSC_MPCR);
483 v = (v & ~(0x3 << 12)) | ((len & 0x3) << 12);
487 writel(v, pi->mpsc_base + MPSC_MPCR);
492 mpsc_set_stop_bit_length(struct mpsc_port_info *pi, u32 len)
496 pr_debug("mpsc_set_stop_bit_length[%d]: stop bits: %d\n",
499 v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
500 readl(pi->mpsc_base + MPSC_MPCR);
502 v = (v & ~(1 << 14)) | ((len & 0x1) << 14);
506 writel(v, pi->mpsc_base + MPSC_MPCR);
511 mpsc_set_parity(struct mpsc_port_info *pi, u32 p)
515 pr_debug("mpsc_set_parity[%d]: parity bits: 0x%x\n", pi->port.line, p);
517 v = (pi->mirror_regs) ? pi->MPSC_CHR_2_m :
518 readl(pi->mpsc_base + MPSC_CHR_2);
521 v = (v & ~0xc000c) | (p << 18) | (p << 2);
524 pi->MPSC_CHR_2_m = v;
525 writel(v, pi->mpsc_base + MPSC_CHR_2);
530 ******************************************************************************
532 * Driver Init Routines
534 ******************************************************************************
538 mpsc_init_hw(struct mpsc_port_info *pi)
540 pr_debug("mpsc_init_hw[%d]: Initializing\n", pi->port.line);
542 mpsc_brg_init(pi, pi->brg_clk_src);
544 mpsc_sdma_init(pi, dma_get_cache_alignment()); /* burst a cacheline */
552 mpsc_alloc_ring_mem(struct mpsc_port_info *pi)
556 pr_debug("mpsc_alloc_ring_mem[%d]: Allocating ring mem\n",
559 if (!pi->dma_region) {
560 if (!dma_supported(pi->port.dev, 0xffffffff)) {
561 printk(KERN_ERR "MPSC: Inadequate DMA support\n");
564 else if ((pi->dma_region = dma_alloc_noncoherent(pi->port.dev,
565 MPSC_DMA_ALLOC_SIZE, &pi->dma_region_p, GFP_KERNEL))
568 printk(KERN_ERR "MPSC: Can't alloc Desc region\n");
577 mpsc_free_ring_mem(struct mpsc_port_info *pi)
579 pr_debug("mpsc_free_ring_mem[%d]: Freeing ring mem\n", pi->port.line);
581 if (pi->dma_region) {
582 dma_free_noncoherent(pi->port.dev, MPSC_DMA_ALLOC_SIZE,
583 pi->dma_region, pi->dma_region_p);
584 pi->dma_region = NULL;
585 pi->dma_region_p = (dma_addr_t) NULL;
592 mpsc_init_rings(struct mpsc_port_info *pi)
594 struct mpsc_rx_desc *rxre;
595 struct mpsc_tx_desc *txre;
600 pr_debug("mpsc_init_rings[%d]: Initializing rings\n", pi->port.line);
602 BUG_ON(pi->dma_region == NULL);
604 memset(pi->dma_region, 0, MPSC_DMA_ALLOC_SIZE);
607 * Descriptors & buffers are multiples of cacheline size and must be
610 dp = ALIGN((u32) pi->dma_region, dma_get_cache_alignment());
611 dp_p = ALIGN((u32) pi->dma_region_p, dma_get_cache_alignment());
614 * Partition dma region into rx ring descriptor, rx buffers,
615 * tx ring descriptors, and tx buffers.
620 dp_p += MPSC_RXR_SIZE;
623 pi->rxb_p = (u8 *) dp_p;
625 dp_p += MPSC_RXB_SIZE;
632 dp_p += MPSC_TXR_SIZE;
635 pi->txb_p = (u8 *) dp_p;
640 /* Init rx ring descriptors */
646 for (i = 0; i < MPSC_RXR_ENTRIES; i++) {
647 rxre = (struct mpsc_rx_desc *)dp;
649 rxre->bufsize = cpu_to_be16(MPSC_RXBE_SIZE);
650 rxre->bytecnt = cpu_to_be16(0);
651 rxre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O |
652 SDMA_DESC_CMDSTAT_EI |
653 SDMA_DESC_CMDSTAT_F |
654 SDMA_DESC_CMDSTAT_L);
655 rxre->link = cpu_to_be32(dp_p + MPSC_RXRE_SIZE);
656 rxre->buf_ptr = cpu_to_be32(bp_p);
658 dp += MPSC_RXRE_SIZE;
659 dp_p += MPSC_RXRE_SIZE;
660 bp += MPSC_RXBE_SIZE;
661 bp_p += MPSC_RXBE_SIZE;
663 rxre->link = cpu_to_be32(pi->rxr_p); /* Wrap last back to first */
665 /* Init tx ring descriptors */
671 for (i = 0; i < MPSC_TXR_ENTRIES; i++) {
672 txre = (struct mpsc_tx_desc *)dp;
674 txre->link = cpu_to_be32(dp_p + MPSC_TXRE_SIZE);
675 txre->buf_ptr = cpu_to_be32(bp_p);
677 dp += MPSC_TXRE_SIZE;
678 dp_p += MPSC_TXRE_SIZE;
679 bp += MPSC_TXBE_SIZE;
680 bp_p += MPSC_TXBE_SIZE;
682 txre->link = cpu_to_be32(pi->txr_p); /* Wrap last back to first */
684 dma_cache_sync((void *) pi->dma_region, MPSC_DMA_ALLOC_SIZE,
686 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
687 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
688 flush_dcache_range((ulong)pi->dma_region,
689 (ulong)pi->dma_region + MPSC_DMA_ALLOC_SIZE);
696 mpsc_uninit_rings(struct mpsc_port_info *pi)
698 pr_debug("mpsc_uninit_rings[%d]: Uninitializing rings\n",pi->port.line);
700 BUG_ON(pi->dma_region == NULL);
719 mpsc_make_ready(struct mpsc_port_info *pi)
723 pr_debug("mpsc_make_ready[%d]: Making cltr ready\n", pi->port.line);
727 if ((rc = mpsc_alloc_ring_mem(pi)))
737 ******************************************************************************
739 * Interrupt Handling Routines
741 ******************************************************************************
745 mpsc_rx_intr(struct mpsc_port_info *pi, struct pt_regs *regs)
747 struct mpsc_rx_desc *rxre;
748 struct tty_struct *tty = pi->port.info->tty;
749 u32 cmdstat, bytes_in, i;
752 char flag = TTY_NORMAL;
754 pr_debug("mpsc_rx_intr[%d]: Handling Rx intr\n", pi->port.line);
756 rxre = (struct mpsc_rx_desc *)(pi->rxr + (pi->rxr_posn*MPSC_RXRE_SIZE));
758 dma_cache_sync((void *)rxre, MPSC_RXRE_SIZE, DMA_FROM_DEVICE);
759 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
760 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
761 invalidate_dcache_range((ulong)rxre,
762 (ulong)rxre + MPSC_RXRE_SIZE);
766 * Loop through Rx descriptors handling ones that have been completed.
768 while (!((cmdstat = be32_to_cpu(rxre->cmdstat)) & SDMA_DESC_CMDSTAT_O)){
769 bytes_in = be16_to_cpu(rxre->bytecnt);
771 /* Following use of tty struct directly is deprecated */
772 if (unlikely(tty_buffer_request_room(tty, bytes_in) < bytes_in)) {
773 if (tty->low_latency)
774 tty_flip_buffer_push(tty);
776 * If this failed then we will throw away the bytes
777 * but must do so to clear interrupts.
781 bp = pi->rxb + (pi->rxr_posn * MPSC_RXBE_SIZE);
782 dma_cache_sync((void *) bp, MPSC_RXBE_SIZE, DMA_FROM_DEVICE);
783 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
784 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
785 invalidate_dcache_range((ulong)bp,
786 (ulong)bp + MPSC_RXBE_SIZE);
790 * Other than for parity error, the manual provides little
791 * info on what data will be in a frame flagged by any of
792 * these errors. For parity error, it is the last byte in
793 * the buffer that had the error. As for the rest, I guess
794 * we'll assume there is no data in the buffer.
795 * If there is...it gets lost.
797 if (unlikely(cmdstat & (SDMA_DESC_CMDSTAT_BR |
798 SDMA_DESC_CMDSTAT_FR | SDMA_DESC_CMDSTAT_OR))) {
800 pi->port.icount.rx++;
802 if (cmdstat & SDMA_DESC_CMDSTAT_BR) { /* Break */
803 pi->port.icount.brk++;
805 if (uart_handle_break(&pi->port))
808 else if (cmdstat & SDMA_DESC_CMDSTAT_FR)/* Framing */
809 pi->port.icount.frame++;
810 else if (cmdstat & SDMA_DESC_CMDSTAT_OR) /* Overrun */
811 pi->port.icount.overrun++;
813 cmdstat &= pi->port.read_status_mask;
815 if (cmdstat & SDMA_DESC_CMDSTAT_BR)
817 else if (cmdstat & SDMA_DESC_CMDSTAT_FR)
819 else if (cmdstat & SDMA_DESC_CMDSTAT_OR)
821 else if (cmdstat & SDMA_DESC_CMDSTAT_PE)
825 if (uart_handle_sysrq_char(&pi->port, *bp, regs)) {
831 if ((unlikely(cmdstat & (SDMA_DESC_CMDSTAT_BR |
832 SDMA_DESC_CMDSTAT_FR | SDMA_DESC_CMDSTAT_OR))) &&
833 !(cmdstat & pi->port.ignore_status_mask))
835 tty_insert_flip_char(tty, *bp, flag);
837 for (i=0; i<bytes_in; i++)
838 tty_insert_flip_char(tty, *bp++, TTY_NORMAL);
840 pi->port.icount.rx += bytes_in;
844 rxre->bytecnt = cpu_to_be16(0);
846 rxre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O |
847 SDMA_DESC_CMDSTAT_EI |
848 SDMA_DESC_CMDSTAT_F |
849 SDMA_DESC_CMDSTAT_L);
851 dma_cache_sync((void *)rxre, MPSC_RXRE_SIZE, DMA_BIDIRECTIONAL);
852 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
853 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
854 flush_dcache_range((ulong)rxre,
855 (ulong)rxre + MPSC_RXRE_SIZE);
858 /* Advance to next descriptor */
859 pi->rxr_posn = (pi->rxr_posn + 1) & (MPSC_RXR_ENTRIES - 1);
860 rxre = (struct mpsc_rx_desc *)(pi->rxr +
861 (pi->rxr_posn * MPSC_RXRE_SIZE));
862 dma_cache_sync((void *)rxre, MPSC_RXRE_SIZE, DMA_FROM_DEVICE);
863 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
864 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
865 invalidate_dcache_range((ulong)rxre,
866 (ulong)rxre + MPSC_RXRE_SIZE);
872 /* Restart rx engine, if its stopped */
873 if ((readl(pi->sdma_base + SDMA_SDCM) & SDMA_SDCM_ERD) == 0)
876 tty_flip_buffer_push(tty);
881 mpsc_setup_tx_desc(struct mpsc_port_info *pi, u32 count, u32 intr)
883 struct mpsc_tx_desc *txre;
885 txre = (struct mpsc_tx_desc *)(pi->txr +
886 (pi->txr_head * MPSC_TXRE_SIZE));
888 txre->bytecnt = cpu_to_be16(count);
889 txre->shadow = txre->bytecnt;
890 wmb(); /* ensure cmdstat is last field updated */
891 txre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O | SDMA_DESC_CMDSTAT_F |
892 SDMA_DESC_CMDSTAT_L | ((intr) ?
896 dma_cache_sync((void *) txre, MPSC_TXRE_SIZE, DMA_BIDIRECTIONAL);
897 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
898 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
899 flush_dcache_range((ulong)txre,
900 (ulong)txre + MPSC_TXRE_SIZE);
907 mpsc_copy_tx_data(struct mpsc_port_info *pi)
909 struct circ_buf *xmit = &pi->port.info->xmit;
913 /* Make sure the desc ring isn't full */
914 while (CIRC_CNT(pi->txr_head, pi->txr_tail, MPSC_TXR_ENTRIES) <
915 (MPSC_TXR_ENTRIES - 1)) {
916 if (pi->port.x_char) {
918 * Ideally, we should use the TCS field in
919 * CHR_1 to put the x_char out immediately but
920 * errata prevents us from being able to read
921 * CHR_2 to know that its safe to write to
922 * CHR_1. Instead, just put it in-band with
923 * all the other Tx data.
925 bp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE);
926 *bp = pi->port.x_char;
930 else if (!uart_circ_empty(xmit) && !uart_tx_stopped(&pi->port)){
931 i = min((u32) MPSC_TXBE_SIZE,
932 (u32) uart_circ_chars_pending(xmit));
933 i = min(i, (u32) CIRC_CNT_TO_END(xmit->head, xmit->tail,
935 bp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE);
936 memcpy(bp, &xmit->buf[xmit->tail], i);
937 xmit->tail = (xmit->tail + i) & (UART_XMIT_SIZE - 1);
939 if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
940 uart_write_wakeup(&pi->port);
942 else /* All tx data copied into ring bufs */
945 dma_cache_sync((void *) bp, MPSC_TXBE_SIZE, DMA_BIDIRECTIONAL);
946 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
947 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
948 flush_dcache_range((ulong)bp,
949 (ulong)bp + MPSC_TXBE_SIZE);
951 mpsc_setup_tx_desc(pi, i, 1);
953 /* Advance to next descriptor */
954 pi->txr_head = (pi->txr_head + 1) & (MPSC_TXR_ENTRIES - 1);
961 mpsc_tx_intr(struct mpsc_port_info *pi)
963 struct mpsc_tx_desc *txre;
966 if (!mpsc_sdma_tx_active(pi)) {
967 txre = (struct mpsc_tx_desc *)(pi->txr +
968 (pi->txr_tail * MPSC_TXRE_SIZE));
970 dma_cache_sync((void *) txre, MPSC_TXRE_SIZE, DMA_FROM_DEVICE);
971 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
972 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
973 invalidate_dcache_range((ulong)txre,
974 (ulong)txre + MPSC_TXRE_SIZE);
977 while (!(be32_to_cpu(txre->cmdstat) & SDMA_DESC_CMDSTAT_O)) {
979 pi->port.icount.tx += be16_to_cpu(txre->bytecnt);
980 pi->txr_tail = (pi->txr_tail+1) & (MPSC_TXR_ENTRIES-1);
982 /* If no more data to tx, fall out of loop */
983 if (pi->txr_head == pi->txr_tail)
986 txre = (struct mpsc_tx_desc *)(pi->txr +
987 (pi->txr_tail * MPSC_TXRE_SIZE));
988 dma_cache_sync((void *) txre, MPSC_TXRE_SIZE,
990 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
991 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
992 invalidate_dcache_range((ulong)txre,
993 (ulong)txre + MPSC_TXRE_SIZE);
997 mpsc_copy_tx_data(pi);
998 mpsc_sdma_start_tx(pi); /* start next desc if ready */
1005 * This is the driver's interrupt handler. To avoid a race, we first clear
1006 * the interrupt, then handle any completed Rx/Tx descriptors. When done
1007 * handling those descriptors, we restart the Rx/Tx engines if they're stopped.
1010 mpsc_sdma_intr(int irq, void *dev_id, struct pt_regs *regs)
1012 struct mpsc_port_info *pi = dev_id;
1016 pr_debug("mpsc_sdma_intr[%d]: SDMA Interrupt Received\n",pi->port.line);
1018 spin_lock_irqsave(&pi->port.lock, iflags);
1019 mpsc_sdma_intr_ack(pi);
1020 if (mpsc_rx_intr(pi, regs))
1022 if (mpsc_tx_intr(pi))
1024 spin_unlock_irqrestore(&pi->port.lock, iflags);
1026 pr_debug("mpsc_sdma_intr[%d]: SDMA Interrupt Handled\n", pi->port.line);
1031 ******************************************************************************
1033 * serial_core.c Interface routines
1035 ******************************************************************************
1038 mpsc_tx_empty(struct uart_port *port)
1040 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1044 spin_lock_irqsave(&pi->port.lock, iflags);
1045 rc = mpsc_sdma_tx_active(pi) ? 0 : TIOCSER_TEMT;
1046 spin_unlock_irqrestore(&pi->port.lock, iflags);
1052 mpsc_set_mctrl(struct uart_port *port, uint mctrl)
1054 /* Have no way to set modem control lines AFAICT */
1059 mpsc_get_mctrl(struct uart_port *port)
1061 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1064 status = (pi->mirror_regs) ? pi->MPSC_CHR_10_m :
1065 readl(pi->mpsc_base + MPSC_CHR_10);
1069 mflags |= TIOCM_CTS;
1071 mflags |= TIOCM_CAR;
1073 return mflags | TIOCM_DSR; /* No way to tell if DSR asserted */
1077 mpsc_stop_tx(struct uart_port *port)
1079 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1081 pr_debug("mpsc_stop_tx[%d]\n", port->line);
1088 mpsc_start_tx(struct uart_port *port)
1090 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1093 mpsc_copy_tx_data(pi);
1094 mpsc_sdma_start_tx(pi);
1096 pr_debug("mpsc_start_tx[%d]\n", port->line);
1101 mpsc_start_rx(struct mpsc_port_info *pi)
1103 pr_debug("mpsc_start_rx[%d]: Starting...\n", pi->port.line);
1105 /* Issue a Receive Abort to clear any receive errors */
1106 writel(MPSC_CHR_2_RA, pi->mpsc_base + MPSC_CHR_2);
1108 mpsc_enter_hunt(pi);
1109 mpsc_sdma_cmd(pi, SDMA_SDCM_ERD);
1115 mpsc_stop_rx(struct uart_port *port)
1117 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1119 pr_debug("mpsc_stop_rx[%d]: Stopping...\n", port->line);
1121 mpsc_sdma_cmd(pi, SDMA_SDCM_AR);
1126 mpsc_enable_ms(struct uart_port *port)
1128 return; /* Not supported */
1132 mpsc_break_ctl(struct uart_port *port, int ctl)
1134 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1138 v = ctl ? 0x00ff0000 : 0;
1140 spin_lock_irqsave(&pi->port.lock, flags);
1141 if (pi->mirror_regs)
1142 pi->MPSC_CHR_1_m = v;
1143 writel(v, pi->mpsc_base + MPSC_CHR_1);
1144 spin_unlock_irqrestore(&pi->port.lock, flags);
1150 mpsc_startup(struct uart_port *port)
1152 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1156 pr_debug("mpsc_startup[%d]: Starting up MPSC, irq: %d\n",
1157 port->line, pi->port.irq);
1159 if ((rc = mpsc_make_ready(pi)) == 0) {
1160 /* Setup IRQ handler */
1161 mpsc_sdma_intr_ack(pi);
1163 /* If irq's are shared, need to set flag */
1164 if (mpsc_ports[0].port.irq == mpsc_ports[1].port.irq)
1167 if (request_irq(pi->port.irq, mpsc_sdma_intr, flag,
1169 printk(KERN_ERR "MPSC: Can't get SDMA IRQ %d\n",
1172 mpsc_sdma_intr_unmask(pi, 0xf);
1173 mpsc_sdma_set_rx_ring(pi, (struct mpsc_rx_desc *)(pi->rxr_p +
1174 (pi->rxr_posn * MPSC_RXRE_SIZE)));
1181 mpsc_shutdown(struct uart_port *port)
1183 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1185 pr_debug("mpsc_shutdown[%d]: Shutting down MPSC\n", port->line);
1188 free_irq(pi->port.irq, pi);
1193 mpsc_set_termios(struct uart_port *port, struct termios *termios,
1194 struct termios *old)
1196 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1199 u32 chr_bits, stop_bits, par;
1201 pi->c_iflag = termios->c_iflag;
1202 pi->c_cflag = termios->c_cflag;
1204 switch (termios->c_cflag & CSIZE) {
1206 chr_bits = MPSC_MPCR_CL_5;
1209 chr_bits = MPSC_MPCR_CL_6;
1212 chr_bits = MPSC_MPCR_CL_7;
1216 chr_bits = MPSC_MPCR_CL_8;
1220 if (termios->c_cflag & CSTOPB)
1221 stop_bits = MPSC_MPCR_SBL_2;
1223 stop_bits = MPSC_MPCR_SBL_1;
1225 par = MPSC_CHR_2_PAR_EVEN;
1226 if (termios->c_cflag & PARENB)
1227 if (termios->c_cflag & PARODD)
1228 par = MPSC_CHR_2_PAR_ODD;
1230 if (termios->c_cflag & CMSPAR) {
1231 if (termios->c_cflag & PARODD)
1232 par = MPSC_CHR_2_PAR_MARK;
1234 par = MPSC_CHR_2_PAR_SPACE;
1238 baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk);
1240 spin_lock_irqsave(&pi->port.lock, flags);
1242 uart_update_timeout(port, termios->c_cflag, baud);
1244 mpsc_set_char_length(pi, chr_bits);
1245 mpsc_set_stop_bit_length(pi, stop_bits);
1246 mpsc_set_parity(pi, par);
1247 mpsc_set_baudrate(pi, baud);
1249 /* Characters/events to read */
1251 pi->port.read_status_mask = SDMA_DESC_CMDSTAT_OR;
1253 if (termios->c_iflag & INPCK)
1254 pi->port.read_status_mask |= SDMA_DESC_CMDSTAT_PE |
1255 SDMA_DESC_CMDSTAT_FR;
1257 if (termios->c_iflag & (BRKINT | PARMRK))
1258 pi->port.read_status_mask |= SDMA_DESC_CMDSTAT_BR;
1260 /* Characters/events to ignore */
1261 pi->port.ignore_status_mask = 0;
1263 if (termios->c_iflag & IGNPAR)
1264 pi->port.ignore_status_mask |= SDMA_DESC_CMDSTAT_PE |
1265 SDMA_DESC_CMDSTAT_FR;
1267 if (termios->c_iflag & IGNBRK) {
1268 pi->port.ignore_status_mask |= SDMA_DESC_CMDSTAT_BR;
1270 if (termios->c_iflag & IGNPAR)
1271 pi->port.ignore_status_mask |= SDMA_DESC_CMDSTAT_OR;
1274 /* Ignore all chars if CREAD not set */
1275 if (!(termios->c_cflag & CREAD))
1280 spin_unlock_irqrestore(&pi->port.lock, flags);
1285 mpsc_type(struct uart_port *port)
1287 pr_debug("mpsc_type[%d]: port type: %s\n", port->line,MPSC_DRIVER_NAME);
1288 return MPSC_DRIVER_NAME;
1292 mpsc_request_port(struct uart_port *port)
1294 /* Should make chip/platform specific call */
1299 mpsc_release_port(struct uart_port *port)
1301 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1304 mpsc_uninit_rings(pi);
1305 mpsc_free_ring_mem(pi);
1313 mpsc_config_port(struct uart_port *port, int flags)
1319 mpsc_verify_port(struct uart_port *port, struct serial_struct *ser)
1321 struct mpsc_port_info *pi = (struct mpsc_port_info *)port;
1324 pr_debug("mpsc_verify_port[%d]: Verifying port data\n", pi->port.line);
1326 if (ser->type != PORT_UNKNOWN && ser->type != PORT_MPSC)
1328 else if (pi->port.irq != ser->irq)
1330 else if (ser->io_type != SERIAL_IO_MEM)
1332 else if (pi->port.uartclk / 16 != ser->baud_base) /* Not sure */
1334 else if ((void *)pi->port.mapbase != ser->iomem_base)
1336 else if (pi->port.iobase != ser->port)
1338 else if (ser->hub6 != 0)
1344 static struct uart_ops mpsc_pops = {
1345 .tx_empty = mpsc_tx_empty,
1346 .set_mctrl = mpsc_set_mctrl,
1347 .get_mctrl = mpsc_get_mctrl,
1348 .stop_tx = mpsc_stop_tx,
1349 .start_tx = mpsc_start_tx,
1350 .stop_rx = mpsc_stop_rx,
1351 .enable_ms = mpsc_enable_ms,
1352 .break_ctl = mpsc_break_ctl,
1353 .startup = mpsc_startup,
1354 .shutdown = mpsc_shutdown,
1355 .set_termios = mpsc_set_termios,
1357 .release_port = mpsc_release_port,
1358 .request_port = mpsc_request_port,
1359 .config_port = mpsc_config_port,
1360 .verify_port = mpsc_verify_port,
1364 ******************************************************************************
1366 * Console Interface Routines
1368 ******************************************************************************
1371 #ifdef CONFIG_SERIAL_MPSC_CONSOLE
1373 mpsc_console_write(struct console *co, const char *s, uint count)
1375 struct mpsc_port_info *pi = &mpsc_ports[co->index];
1376 u8 *bp, *dp, add_cr = 0;
1379 while (mpsc_sdma_tx_active(pi))
1383 bp = dp = pi->txb + (pi->txr_head * MPSC_TXBE_SIZE);
1385 for (i = 0; i < MPSC_TXBE_SIZE; i++) {
1396 if (*(s++) == '\n') { /* add '\r' after '\n' */
1405 dma_cache_sync((void *) bp, MPSC_TXBE_SIZE, DMA_BIDIRECTIONAL);
1406 #if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
1407 if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
1408 flush_dcache_range((ulong)bp,
1409 (ulong)bp + MPSC_TXBE_SIZE);
1411 mpsc_setup_tx_desc(pi, i, 0);
1412 pi->txr_head = (pi->txr_head + 1) & (MPSC_TXR_ENTRIES - 1);
1413 mpsc_sdma_start_tx(pi);
1415 while (mpsc_sdma_tx_active(pi))
1418 pi->txr_tail = (pi->txr_tail + 1) & (MPSC_TXR_ENTRIES - 1);
1425 mpsc_console_setup(struct console *co, char *options)
1427 struct mpsc_port_info *pi;
1428 int baud, bits, parity, flow;
1430 pr_debug("mpsc_console_setup[%d]: options: %s\n", co->index, options);
1432 if (co->index >= MPSC_NUM_CTLRS)
1435 pi = &mpsc_ports[co->index];
1437 baud = pi->default_baud;
1438 bits = pi->default_bits;
1439 parity = pi->default_parity;
1440 flow = pi->default_flow;
1445 spin_lock_init(&pi->port.lock); /* Temporary fix--copied from 8250.c */
1448 uart_parse_options(options, &baud, &parity, &bits, &flow);
1450 return uart_set_options(&pi->port, co, baud, parity, bits, flow);
1453 static struct console mpsc_console = {
1454 .name = MPSC_DEV_NAME,
1455 .write = mpsc_console_write,
1456 .device = uart_console_device,
1457 .setup = mpsc_console_setup,
1458 .flags = CON_PRINTBUFFER,
1464 mpsc_late_console_init(void)
1466 pr_debug("mpsc_late_console_init: Enter\n");
1468 if (!(mpsc_console.flags & CON_ENABLED))
1469 register_console(&mpsc_console);
1473 late_initcall(mpsc_late_console_init);
1475 #define MPSC_CONSOLE &mpsc_console
1477 #define MPSC_CONSOLE NULL
1480 ******************************************************************************
1482 * Dummy Platform Driver to extract & map shared register regions
1484 ******************************************************************************
1487 mpsc_resource_err(char *s)
1489 printk(KERN_WARNING "MPSC: Platform device resource error in %s\n", s);
1494 mpsc_shared_map_regs(struct platform_device *pd)
1498 if ((r = platform_get_resource(pd, IORESOURCE_MEM,
1499 MPSC_ROUTING_BASE_ORDER)) && request_mem_region(r->start,
1500 MPSC_ROUTING_REG_BLOCK_SIZE, "mpsc_routing_regs")) {
1502 mpsc_shared_regs.mpsc_routing_base = ioremap(r->start,
1503 MPSC_ROUTING_REG_BLOCK_SIZE);
1504 mpsc_shared_regs.mpsc_routing_base_p = r->start;
1507 mpsc_resource_err("MPSC routing base");
1511 if ((r = platform_get_resource(pd, IORESOURCE_MEM,
1512 MPSC_SDMA_INTR_BASE_ORDER)) && request_mem_region(r->start,
1513 MPSC_SDMA_INTR_REG_BLOCK_SIZE, "sdma_intr_regs")) {
1515 mpsc_shared_regs.sdma_intr_base = ioremap(r->start,
1516 MPSC_SDMA_INTR_REG_BLOCK_SIZE);
1517 mpsc_shared_regs.sdma_intr_base_p = r->start;
1520 iounmap(mpsc_shared_regs.mpsc_routing_base);
1521 release_mem_region(mpsc_shared_regs.mpsc_routing_base_p,
1522 MPSC_ROUTING_REG_BLOCK_SIZE);
1523 mpsc_resource_err("SDMA intr base");
1531 mpsc_shared_unmap_regs(void)
1533 if (!mpsc_shared_regs.mpsc_routing_base) {
1534 iounmap(mpsc_shared_regs.mpsc_routing_base);
1535 release_mem_region(mpsc_shared_regs.mpsc_routing_base_p,
1536 MPSC_ROUTING_REG_BLOCK_SIZE);
1538 if (!mpsc_shared_regs.sdma_intr_base) {
1539 iounmap(mpsc_shared_regs.sdma_intr_base);
1540 release_mem_region(mpsc_shared_regs.sdma_intr_base_p,
1541 MPSC_SDMA_INTR_REG_BLOCK_SIZE);
1544 mpsc_shared_regs.mpsc_routing_base = NULL;
1545 mpsc_shared_regs.sdma_intr_base = NULL;
1547 mpsc_shared_regs.mpsc_routing_base_p = 0;
1548 mpsc_shared_regs.sdma_intr_base_p = 0;
1554 mpsc_shared_drv_probe(struct platform_device *dev)
1556 struct mpsc_shared_pdata *pdata;
1560 if (!(rc = mpsc_shared_map_regs(dev))) {
1561 pdata = (struct mpsc_shared_pdata *)dev->dev.platform_data;
1563 mpsc_shared_regs.MPSC_MRR_m = pdata->mrr_val;
1564 mpsc_shared_regs.MPSC_RCRR_m= pdata->rcrr_val;
1565 mpsc_shared_regs.MPSC_TCRR_m= pdata->tcrr_val;
1566 mpsc_shared_regs.SDMA_INTR_CAUSE_m =
1567 pdata->intr_cause_val;
1568 mpsc_shared_regs.SDMA_INTR_MASK_m =
1569 pdata->intr_mask_val;
1579 mpsc_shared_drv_remove(struct platform_device *dev)
1584 mpsc_shared_unmap_regs();
1585 mpsc_shared_regs.MPSC_MRR_m = 0;
1586 mpsc_shared_regs.MPSC_RCRR_m = 0;
1587 mpsc_shared_regs.MPSC_TCRR_m = 0;
1588 mpsc_shared_regs.SDMA_INTR_CAUSE_m = 0;
1589 mpsc_shared_regs.SDMA_INTR_MASK_m = 0;
1596 static struct platform_driver mpsc_shared_driver = {
1597 .probe = mpsc_shared_drv_probe,
1598 .remove = mpsc_shared_drv_remove,
1600 .name = MPSC_SHARED_NAME,
1605 ******************************************************************************
1607 * Driver Interface Routines
1609 ******************************************************************************
1611 static struct uart_driver mpsc_reg = {
1612 .owner = THIS_MODULE,
1613 .driver_name = MPSC_DRIVER_NAME,
1614 .devfs_name = MPSC_DEVFS_NAME,
1615 .dev_name = MPSC_DEV_NAME,
1616 .major = MPSC_MAJOR,
1617 .minor = MPSC_MINOR_START,
1618 .nr = MPSC_NUM_CTLRS,
1619 .cons = MPSC_CONSOLE,
1623 mpsc_drv_map_regs(struct mpsc_port_info *pi, struct platform_device *pd)
1627 if ((r = platform_get_resource(pd, IORESOURCE_MEM, MPSC_BASE_ORDER)) &&
1628 request_mem_region(r->start, MPSC_REG_BLOCK_SIZE, "mpsc_regs")){
1630 pi->mpsc_base = ioremap(r->start, MPSC_REG_BLOCK_SIZE);
1631 pi->mpsc_base_p = r->start;
1634 mpsc_resource_err("MPSC base");
1638 if ((r = platform_get_resource(pd, IORESOURCE_MEM,
1639 MPSC_SDMA_BASE_ORDER)) && request_mem_region(r->start,
1640 MPSC_SDMA_REG_BLOCK_SIZE, "sdma_regs")) {
1642 pi->sdma_base = ioremap(r->start,MPSC_SDMA_REG_BLOCK_SIZE);
1643 pi->sdma_base_p = r->start;
1646 mpsc_resource_err("SDMA base");
1650 if ((r = platform_get_resource(pd,IORESOURCE_MEM,MPSC_BRG_BASE_ORDER))
1651 && request_mem_region(r->start, MPSC_BRG_REG_BLOCK_SIZE,
1654 pi->brg_base = ioremap(r->start, MPSC_BRG_REG_BLOCK_SIZE);
1655 pi->brg_base_p = r->start;
1658 mpsc_resource_err("BRG base");
1666 mpsc_drv_unmap_regs(struct mpsc_port_info *pi)
1668 if (!pi->mpsc_base) {
1669 iounmap(pi->mpsc_base);
1670 release_mem_region(pi->mpsc_base_p, MPSC_REG_BLOCK_SIZE);
1672 if (!pi->sdma_base) {
1673 iounmap(pi->sdma_base);
1674 release_mem_region(pi->sdma_base_p, MPSC_SDMA_REG_BLOCK_SIZE);
1676 if (!pi->brg_base) {
1677 iounmap(pi->brg_base);
1678 release_mem_region(pi->brg_base_p, MPSC_BRG_REG_BLOCK_SIZE);
1681 pi->mpsc_base = NULL;
1682 pi->sdma_base = NULL;
1683 pi->brg_base = NULL;
1685 pi->mpsc_base_p = 0;
1686 pi->sdma_base_p = 0;
1693 mpsc_drv_get_platform_data(struct mpsc_port_info *pi,
1694 struct platform_device *pd, int num)
1696 struct mpsc_pdata *pdata;
1698 pdata = (struct mpsc_pdata *)pd->dev.platform_data;
1700 pi->port.uartclk = pdata->brg_clk_freq;
1701 pi->port.iotype = UPIO_MEM;
1702 pi->port.line = num;
1703 pi->port.type = PORT_MPSC;
1704 pi->port.fifosize = MPSC_TXBE_SIZE;
1705 pi->port.membase = pi->mpsc_base;
1706 pi->port.mapbase = (ulong)pi->mpsc_base;
1707 pi->port.ops = &mpsc_pops;
1709 pi->mirror_regs = pdata->mirror_regs;
1710 pi->cache_mgmt = pdata->cache_mgmt;
1711 pi->brg_can_tune = pdata->brg_can_tune;
1712 pi->brg_clk_src = pdata->brg_clk_src;
1713 pi->mpsc_max_idle = pdata->max_idle;
1714 pi->default_baud = pdata->default_baud;
1715 pi->default_bits = pdata->default_bits;
1716 pi->default_parity = pdata->default_parity;
1717 pi->default_flow = pdata->default_flow;
1719 /* Initial values of mirrored regs */
1720 pi->MPSC_CHR_1_m = pdata->chr_1_val;
1721 pi->MPSC_CHR_2_m = pdata->chr_2_val;
1722 pi->MPSC_CHR_10_m = pdata->chr_10_val;
1723 pi->MPSC_MPCR_m = pdata->mpcr_val;
1724 pi->BRG_BCR_m = pdata->bcr_val;
1726 pi->shared_regs = &mpsc_shared_regs;
1728 pi->port.irq = platform_get_irq(pd, 0);
1734 mpsc_drv_probe(struct platform_device *dev)
1736 struct mpsc_port_info *pi;
1739 pr_debug("mpsc_drv_probe: Adding MPSC %d\n", dev->id);
1741 if (dev->id < MPSC_NUM_CTLRS) {
1742 pi = &mpsc_ports[dev->id];
1744 if (!(rc = mpsc_drv_map_regs(pi, dev))) {
1745 mpsc_drv_get_platform_data(pi, dev, dev->id);
1747 if (!(rc = mpsc_make_ready(pi)))
1748 if (!(rc = uart_add_one_port(&mpsc_reg,
1753 (struct uart_port *)pi);
1754 mpsc_drv_unmap_regs(pi);
1757 mpsc_drv_unmap_regs(pi);
1765 mpsc_drv_remove(struct platform_device *dev)
1767 pr_debug("mpsc_drv_exit: Removing MPSC %d\n", dev->id);
1769 if (dev->id < MPSC_NUM_CTLRS) {
1770 uart_remove_one_port(&mpsc_reg, &mpsc_ports[dev->id].port);
1771 mpsc_release_port((struct uart_port *)&mpsc_ports[dev->id].port);
1772 mpsc_drv_unmap_regs(&mpsc_ports[dev->id]);
1779 static struct platform_driver mpsc_driver = {
1780 .probe = mpsc_drv_probe,
1781 .remove = mpsc_drv_remove,
1783 .name = MPSC_CTLR_NAME,
1792 printk(KERN_INFO "Serial: MPSC driver $Revision: 1.00 $\n");
1794 memset(mpsc_ports, 0, sizeof(mpsc_ports));
1795 memset(&mpsc_shared_regs, 0, sizeof(mpsc_shared_regs));
1797 if (!(rc = uart_register_driver(&mpsc_reg))) {
1798 if (!(rc = platform_driver_register(&mpsc_shared_driver))) {
1799 if ((rc = platform_driver_register(&mpsc_driver))) {
1800 platform_driver_unregister(&mpsc_shared_driver);
1801 uart_unregister_driver(&mpsc_reg);
1805 uart_unregister_driver(&mpsc_reg);
1815 platform_driver_unregister(&mpsc_driver);
1816 platform_driver_unregister(&mpsc_shared_driver);
1817 uart_unregister_driver(&mpsc_reg);
1818 memset(mpsc_ports, 0, sizeof(mpsc_ports));
1819 memset(&mpsc_shared_regs, 0, sizeof(mpsc_shared_regs));
1823 module_init(mpsc_drv_init);
1824 module_exit(mpsc_drv_exit);
1826 MODULE_AUTHOR("Mark A. Greer <mgreer@mvista.com>");
1827 MODULE_DESCRIPTION("Generic Marvell MPSC serial/UART driver $Revision: 1.00 $");
1828 MODULE_VERSION(MPSC_VERSION);
1829 MODULE_LICENSE("GPL");
1830 MODULE_ALIAS_CHARDEV_MAJOR(MPSC_MAJOR);