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mpsc.c
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mpsc.c
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/*
* Generic driver for the MPSC (UART mode) on Marvell parts (e.g., GT64240,
* GT64260, MV64340, MV64360, GT96100, ... ).
*
* Author: Mark A. Greer <[email protected]>
*
* Based on an old MPSC driver that was in the linuxppc tree. It appears to
* have been created by Chris Zankel (formerly of MontaVista) but there
* is no proper Copyright so I'm not sure. Apparently, parts were also
* taken from PPCBoot (now U-Boot). Also based on drivers/serial/8250.c
* by Russell King.
*
* 2004 (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.
*/
/*
* The MPSC interface is much like a typical network controller's interface.
* That is, you set up separate rings of descriptors for transmitting and
* receiving data. There is also a pool of buffers with (one buffer per
* descriptor) that incoming data are dma'd into or outgoing data are dma'd
* out of.
*
* The MPSC requires two other controllers to be able to work. The Baud Rate
* Generator (BRG) provides a clock at programmable frequencies which determines
* the baud rate. The Serial DMA Controller (SDMA) takes incoming data from the
* MPSC and DMA's it into memory or DMA's outgoing data and passes it to the
* MPSC. It is actually the SDMA interrupt that the driver uses to keep the
* transmit and receive "engines" going (i.e., indicate data has been
* transmitted or received).
*
* NOTES:
*
* 1) Some chips have an erratum where several regs cannot be
* read. To work around that, we keep a local copy of those regs in
* 'mpsc_port_info'.
*
* 2) Some chips have an erratum where the ctlr will hang when the SDMA ctlr
* accesses system mem with coherency enabled. For that reason, the driver
* assumes that coherency for that ctlr has been disabled. This means
* that when in a cache coherent system, the driver has to manually manage
* the data cache on the areas that it touches because the dma_* macro are
* basically no-ops.
*
* 3) There is an erratum (on PPC) where you can't use the instruction to do
* a DMA_TO_DEVICE/cache clean so DMA_BIDIRECTIONAL/flushes are used in places
* where a DMA_TO_DEVICE/clean would have [otherwise] sufficed.
*
* 4) AFAICT, hardware flow control isn't supported by the controller --MAG.
*/
#if defined(CONFIG_SERIAL_MPSC_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
#define SUPPORT_SYSRQ
#endif
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/console.h>
#include <linux/sysrq.h>
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/mv643xx.h>
#include <linux/platform_device.h>
#include <asm/io.h>
#include <asm/irq.h>
#define MPSC_NUM_CTLRS 2
/*
* Descriptors and buffers must be cache line aligned.
* Buffers lengths must be multiple of cache line size.
* Number of Tx & Rx descriptors must be powers of 2.
*/
#define MPSC_RXR_ENTRIES 32
#define MPSC_RXRE_SIZE dma_get_cache_alignment()
#define MPSC_RXR_SIZE (MPSC_RXR_ENTRIES * MPSC_RXRE_SIZE)
#define MPSC_RXBE_SIZE dma_get_cache_alignment()
#define MPSC_RXB_SIZE (MPSC_RXR_ENTRIES * MPSC_RXBE_SIZE)
#define MPSC_TXR_ENTRIES 32
#define MPSC_TXRE_SIZE dma_get_cache_alignment()
#define MPSC_TXR_SIZE (MPSC_TXR_ENTRIES * MPSC_TXRE_SIZE)
#define MPSC_TXBE_SIZE dma_get_cache_alignment()
#define MPSC_TXB_SIZE (MPSC_TXR_ENTRIES * MPSC_TXBE_SIZE)
#define MPSC_DMA_ALLOC_SIZE (MPSC_RXR_SIZE + MPSC_RXB_SIZE + MPSC_TXR_SIZE \
+ MPSC_TXB_SIZE + dma_get_cache_alignment() /* for alignment */)
/* Rx and Tx Ring entry descriptors -- assume entry size is <= cacheline size */
struct mpsc_rx_desc {
u16 bufsize;
u16 bytecnt;
u32 cmdstat;
u32 link;
u32 buf_ptr;
} __attribute((packed));
struct mpsc_tx_desc {
u16 bytecnt;
u16 shadow;
u32 cmdstat;
u32 link;
u32 buf_ptr;
} __attribute((packed));
/*
* Some regs that have the erratum that you can't read them are are shared
* between the two MPSC controllers. This struct contains those shared regs.
*/
struct mpsc_shared_regs {
phys_addr_t mpsc_routing_base_p;
phys_addr_t sdma_intr_base_p;
void __iomem *mpsc_routing_base;
void __iomem *sdma_intr_base;
u32 MPSC_MRR_m;
u32 MPSC_RCRR_m;
u32 MPSC_TCRR_m;
u32 SDMA_INTR_CAUSE_m;
u32 SDMA_INTR_MASK_m;
};
/* The main driver data structure */
struct mpsc_port_info {
struct uart_port port; /* Overlay uart_port structure */
/* Internal driver state for this ctlr */
u8 ready;
u8 rcv_data;
tcflag_t c_iflag; /* save termios->c_iflag */
tcflag_t c_cflag; /* save termios->c_cflag */
/* Info passed in from platform */
u8 mirror_regs; /* Need to mirror regs? */
u8 cache_mgmt; /* Need manual cache mgmt? */
u8 brg_can_tune; /* BRG has baud tuning? */
u32 brg_clk_src;
u16 mpsc_max_idle;
int default_baud;
int default_bits;
int default_parity;
int default_flow;
/* Physical addresses of various blocks of registers (from platform) */
phys_addr_t mpsc_base_p;
phys_addr_t sdma_base_p;
phys_addr_t brg_base_p;
/* Virtual addresses of various blocks of registers (from platform) */
void __iomem *mpsc_base;
void __iomem *sdma_base;
void __iomem *brg_base;
/* Descriptor ring and buffer allocations */
void *dma_region;
dma_addr_t dma_region_p;
dma_addr_t rxr; /* Rx descriptor ring */
dma_addr_t rxr_p; /* Phys addr of rxr */
u8 *rxb; /* Rx Ring I/O buf */
u8 *rxb_p; /* Phys addr of rxb */
u32 rxr_posn; /* First desc w/ Rx data */
dma_addr_t txr; /* Tx descriptor ring */
dma_addr_t txr_p; /* Phys addr of txr */
u8 *txb; /* Tx Ring I/O buf */
u8 *txb_p; /* Phys addr of txb */
int txr_head; /* Where new data goes */
int txr_tail; /* Where sent data comes off */
spinlock_t tx_lock; /* transmit lock */
/* Mirrored values of regs we can't read (if 'mirror_regs' set) */
u32 MPSC_MPCR_m;
u32 MPSC_CHR_1_m;
u32 MPSC_CHR_2_m;
u32 MPSC_CHR_10_m;
u32 BRG_BCR_m;
struct mpsc_shared_regs *shared_regs;
};
/* Hooks to platform-specific code */
int mpsc_platform_register_driver(void);
void mpsc_platform_unregister_driver(void);
/* Hooks back in to mpsc common to be called by platform-specific code */
struct mpsc_port_info *mpsc_device_probe(int index);
struct mpsc_port_info *mpsc_device_remove(int index);
/* Main MPSC Configuration Register Offsets */
#define MPSC_MMCRL 0x0000
#define MPSC_MMCRH 0x0004
#define MPSC_MPCR 0x0008
#define MPSC_CHR_1 0x000c
#define MPSC_CHR_2 0x0010
#define MPSC_CHR_3 0x0014
#define MPSC_CHR_4 0x0018
#define MPSC_CHR_5 0x001c
#define MPSC_CHR_6 0x0020
#define MPSC_CHR_7 0x0024
#define MPSC_CHR_8 0x0028
#define MPSC_CHR_9 0x002c
#define MPSC_CHR_10 0x0030
#define MPSC_CHR_11 0x0034
#define MPSC_MPCR_FRZ (1 << 9)
#define MPSC_MPCR_CL_5 0
#define MPSC_MPCR_CL_6 1
#define MPSC_MPCR_CL_7 2
#define MPSC_MPCR_CL_8 3
#define MPSC_MPCR_SBL_1 0
#define MPSC_MPCR_SBL_2 1
#define MPSC_CHR_2_TEV (1<<1)
#define MPSC_CHR_2_TA (1<<7)
#define MPSC_CHR_2_TTCS (1<<9)
#define MPSC_CHR_2_REV (1<<17)
#define MPSC_CHR_2_RA (1<<23)
#define MPSC_CHR_2_CRD (1<<25)
#define MPSC_CHR_2_EH (1<<31)
#define MPSC_CHR_2_PAR_ODD 0
#define MPSC_CHR_2_PAR_SPACE 1
#define MPSC_CHR_2_PAR_EVEN 2
#define MPSC_CHR_2_PAR_MARK 3
/* MPSC Signal Routing */
#define MPSC_MRR 0x0000
#define MPSC_RCRR 0x0004
#define MPSC_TCRR 0x0008
/* Serial DMA Controller Interface Registers */
#define SDMA_SDC 0x0000
#define SDMA_SDCM 0x0008
#define SDMA_RX_DESC 0x0800
#define SDMA_RX_BUF_PTR 0x0808
#define SDMA_SCRDP 0x0810
#define SDMA_TX_DESC 0x0c00
#define SDMA_SCTDP 0x0c10
#define SDMA_SFTDP 0x0c14
#define SDMA_DESC_CMDSTAT_PE (1<<0)
#define SDMA_DESC_CMDSTAT_CDL (1<<1)
#define SDMA_DESC_CMDSTAT_FR (1<<3)
#define SDMA_DESC_CMDSTAT_OR (1<<6)
#define SDMA_DESC_CMDSTAT_BR (1<<9)
#define SDMA_DESC_CMDSTAT_MI (1<<10)
#define SDMA_DESC_CMDSTAT_A (1<<11)
#define SDMA_DESC_CMDSTAT_AM (1<<12)
#define SDMA_DESC_CMDSTAT_CT (1<<13)
#define SDMA_DESC_CMDSTAT_C (1<<14)
#define SDMA_DESC_CMDSTAT_ES (1<<15)
#define SDMA_DESC_CMDSTAT_L (1<<16)
#define SDMA_DESC_CMDSTAT_F (1<<17)
#define SDMA_DESC_CMDSTAT_P (1<<18)
#define SDMA_DESC_CMDSTAT_EI (1<<23)
#define SDMA_DESC_CMDSTAT_O (1<<31)
#define SDMA_DESC_DFLT (SDMA_DESC_CMDSTAT_O \
| SDMA_DESC_CMDSTAT_EI)
#define SDMA_SDC_RFT (1<<0)
#define SDMA_SDC_SFM (1<<1)
#define SDMA_SDC_BLMR (1<<6)
#define SDMA_SDC_BLMT (1<<7)
#define SDMA_SDC_POVR (1<<8)
#define SDMA_SDC_RIFB (1<<9)
#define SDMA_SDCM_ERD (1<<7)
#define SDMA_SDCM_AR (1<<15)
#define SDMA_SDCM_STD (1<<16)
#define SDMA_SDCM_TXD (1<<23)
#define SDMA_SDCM_AT (1<<31)
#define SDMA_0_CAUSE_RXBUF (1<<0)
#define SDMA_0_CAUSE_RXERR (1<<1)
#define SDMA_0_CAUSE_TXBUF (1<<2)
#define SDMA_0_CAUSE_TXEND (1<<3)
#define SDMA_1_CAUSE_RXBUF (1<<8)
#define SDMA_1_CAUSE_RXERR (1<<9)
#define SDMA_1_CAUSE_TXBUF (1<<10)
#define SDMA_1_CAUSE_TXEND (1<<11)
#define SDMA_CAUSE_RX_MASK (SDMA_0_CAUSE_RXBUF | SDMA_0_CAUSE_RXERR \
| SDMA_1_CAUSE_RXBUF | SDMA_1_CAUSE_RXERR)
#define SDMA_CAUSE_TX_MASK (SDMA_0_CAUSE_TXBUF | SDMA_0_CAUSE_TXEND \
| SDMA_1_CAUSE_TXBUF | SDMA_1_CAUSE_TXEND)
/* SDMA Interrupt registers */
#define SDMA_INTR_CAUSE 0x0000
#define SDMA_INTR_MASK 0x0080
/* Baud Rate Generator Interface Registers */
#define BRG_BCR 0x0000
#define BRG_BTR 0x0004
/*
* Define how this driver is known to the outside (we've been assigned a
* range on the "Low-density serial ports" major).
*/
#define MPSC_MAJOR 204
#define MPSC_MINOR_START 44
#define MPSC_DRIVER_NAME "MPSC"
#define MPSC_DEV_NAME "ttyMM"
#define MPSC_VERSION "1.00"
static struct mpsc_port_info mpsc_ports[MPSC_NUM_CTLRS];
static struct mpsc_shared_regs mpsc_shared_regs;
static struct uart_driver mpsc_reg;
static void mpsc_start_rx(struct mpsc_port_info *pi);
static void mpsc_free_ring_mem(struct mpsc_port_info *pi);
static void mpsc_release_port(struct uart_port *port);
/*
******************************************************************************
*
* Baud Rate Generator Routines (BRG)
*
******************************************************************************
*/
static void mpsc_brg_init(struct mpsc_port_info *pi, u32 clk_src)
{
u32 v;
v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
v = (v & ~(0xf << 18)) | ((clk_src & 0xf) << 18);
if (pi->brg_can_tune)
v &= ~(1 << 25);
if (pi->mirror_regs)
pi->BRG_BCR_m = v;
writel(v, pi->brg_base + BRG_BCR);
writel(readl(pi->brg_base + BRG_BTR) & 0xffff0000,
pi->brg_base + BRG_BTR);
}
static void mpsc_brg_enable(struct mpsc_port_info *pi)
{
u32 v;
v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
v |= (1 << 16);
if (pi->mirror_regs)
pi->BRG_BCR_m = v;
writel(v, pi->brg_base + BRG_BCR);
}
static void mpsc_brg_disable(struct mpsc_port_info *pi)
{
u32 v;
v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
v &= ~(1 << 16);
if (pi->mirror_regs)
pi->BRG_BCR_m = v;
writel(v, pi->brg_base + BRG_BCR);
}
/*
* To set the baud, we adjust the CDV field in the BRG_BCR reg.
* From manual: Baud = clk / ((CDV+1)*2) ==> CDV = (clk / (baud*2)) - 1.
* However, the input clock is divided by 16 in the MPSC b/c of how
* 'MPSC_MMCRH' was set up so we have to divide the 'clk' used in our
* calculation by 16 to account for that. So the real calculation
* that accounts for the way the mpsc is set up is:
* CDV = (clk / (baud*2*16)) - 1 ==> CDV = (clk / (baud << 5)) - 1.
*/
static void mpsc_set_baudrate(struct mpsc_port_info *pi, u32 baud)
{
u32 cdv = (pi->port.uartclk / (baud << 5)) - 1;
u32 v;
mpsc_brg_disable(pi);
v = (pi->mirror_regs) ? pi->BRG_BCR_m : readl(pi->brg_base + BRG_BCR);
v = (v & 0xffff0000) | (cdv & 0xffff);
if (pi->mirror_regs)
pi->BRG_BCR_m = v;
writel(v, pi->brg_base + BRG_BCR);
mpsc_brg_enable(pi);
}
/*
******************************************************************************
*
* Serial DMA Routines (SDMA)
*
******************************************************************************
*/
static void mpsc_sdma_burstsize(struct mpsc_port_info *pi, u32 burst_size)
{
u32 v;
pr_debug("mpsc_sdma_burstsize[%d]: burst_size: %d\n",
pi->port.line, burst_size);
burst_size >>= 3; /* Divide by 8 b/c reg values are 8-byte chunks */
if (burst_size < 2)
v = 0x0; /* 1 64-bit word */
else if (burst_size < 4)
v = 0x1; /* 2 64-bit words */
else if (burst_size < 8)
v = 0x2; /* 4 64-bit words */
else
v = 0x3; /* 8 64-bit words */
writel((readl(pi->sdma_base + SDMA_SDC) & (0x3 << 12)) | (v << 12),
pi->sdma_base + SDMA_SDC);
}
static void mpsc_sdma_init(struct mpsc_port_info *pi, u32 burst_size)
{
pr_debug("mpsc_sdma_init[%d]: burst_size: %d\n", pi->port.line,
burst_size);
writel((readl(pi->sdma_base + SDMA_SDC) & 0x3ff) | 0x03f,
pi->sdma_base + SDMA_SDC);
mpsc_sdma_burstsize(pi, burst_size);
}
static u32 mpsc_sdma_intr_mask(struct mpsc_port_info *pi, u32 mask)
{
u32 old, v;
pr_debug("mpsc_sdma_intr_mask[%d]: mask: 0x%x\n", pi->port.line, mask);
old = v = (pi->mirror_regs) ? pi->shared_regs->SDMA_INTR_MASK_m :
readl(pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
mask &= 0xf;
if (pi->port.line)
mask <<= 8;
v &= ~mask;
if (pi->mirror_regs)
pi->shared_regs->SDMA_INTR_MASK_m = v;
writel(v, pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
if (pi->port.line)
old >>= 8;
return old & 0xf;
}
static void mpsc_sdma_intr_unmask(struct mpsc_port_info *pi, u32 mask)
{
u32 v;
pr_debug("mpsc_sdma_intr_unmask[%d]: mask: 0x%x\n", pi->port.line,mask);
v = (pi->mirror_regs) ? pi->shared_regs->SDMA_INTR_MASK_m
: readl(pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
mask &= 0xf;
if (pi->port.line)
mask <<= 8;
v |= mask;
if (pi->mirror_regs)
pi->shared_regs->SDMA_INTR_MASK_m = v;
writel(v, pi->shared_regs->sdma_intr_base + SDMA_INTR_MASK);
}
static void mpsc_sdma_intr_ack(struct mpsc_port_info *pi)
{
pr_debug("mpsc_sdma_intr_ack[%d]: Acknowledging IRQ\n", pi->port.line);
if (pi->mirror_regs)
pi->shared_regs->SDMA_INTR_CAUSE_m = 0;
writeb(0x00, pi->shared_regs->sdma_intr_base + SDMA_INTR_CAUSE
+ pi->port.line);
}
static void mpsc_sdma_set_rx_ring(struct mpsc_port_info *pi,
struct mpsc_rx_desc *rxre_p)
{
pr_debug("mpsc_sdma_set_rx_ring[%d]: rxre_p: 0x%x\n",
pi->port.line, (u32)rxre_p);
writel((u32)rxre_p, pi->sdma_base + SDMA_SCRDP);
}
static void mpsc_sdma_set_tx_ring(struct mpsc_port_info *pi,
struct mpsc_tx_desc *txre_p)
{
writel((u32)txre_p, pi->sdma_base + SDMA_SFTDP);
writel((u32)txre_p, pi->sdma_base + SDMA_SCTDP);
}
static void mpsc_sdma_cmd(struct mpsc_port_info *pi, u32 val)
{
u32 v;
v = readl(pi->sdma_base + SDMA_SDCM);
if (val)
v |= val;
else
v = 0;
wmb();
writel(v, pi->sdma_base + SDMA_SDCM);
wmb();
}
static uint mpsc_sdma_tx_active(struct mpsc_port_info *pi)
{
return readl(pi->sdma_base + SDMA_SDCM) & SDMA_SDCM_TXD;
}
static void mpsc_sdma_start_tx(struct mpsc_port_info *pi)
{
struct mpsc_tx_desc *txre, *txre_p;
/* If tx isn't running & there's a desc ready to go, start it */
if (!mpsc_sdma_tx_active(pi)) {
txre = (struct mpsc_tx_desc *)(pi->txr
+ (pi->txr_tail * MPSC_TXRE_SIZE));
dma_cache_sync(pi->port.dev, (void *)txre, MPSC_TXRE_SIZE,
DMA_FROM_DEVICE);
#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
invalidate_dcache_range((ulong)txre,
(ulong)txre + MPSC_TXRE_SIZE);
#endif
if (be32_to_cpu(txre->cmdstat) & SDMA_DESC_CMDSTAT_O) {
txre_p = (struct mpsc_tx_desc *)
(pi->txr_p + (pi->txr_tail * MPSC_TXRE_SIZE));
mpsc_sdma_set_tx_ring(pi, txre_p);
mpsc_sdma_cmd(pi, SDMA_SDCM_STD | SDMA_SDCM_TXD);
}
}
}
static void mpsc_sdma_stop(struct mpsc_port_info *pi)
{
pr_debug("mpsc_sdma_stop[%d]: Stopping SDMA\n", pi->port.line);
/* Abort any SDMA transfers */
mpsc_sdma_cmd(pi, 0);
mpsc_sdma_cmd(pi, SDMA_SDCM_AR | SDMA_SDCM_AT);
/* Clear the SDMA current and first TX and RX pointers */
mpsc_sdma_set_tx_ring(pi, NULL);
mpsc_sdma_set_rx_ring(pi, NULL);
/* Disable interrupts */
mpsc_sdma_intr_mask(pi, 0xf);
mpsc_sdma_intr_ack(pi);
}
/*
******************************************************************************
*
* Multi-Protocol Serial Controller Routines (MPSC)
*
******************************************************************************
*/
static void mpsc_hw_init(struct mpsc_port_info *pi)
{
u32 v;
pr_debug("mpsc_hw_init[%d]: Initializing hardware\n", pi->port.line);
/* Set up clock routing */
if (pi->mirror_regs) {
v = pi->shared_regs->MPSC_MRR_m;
v &= ~0x1c7;
pi->shared_regs->MPSC_MRR_m = v;
writel(v, pi->shared_regs->mpsc_routing_base + MPSC_MRR);
v = pi->shared_regs->MPSC_RCRR_m;
v = (v & ~0xf0f) | 0x100;
pi->shared_regs->MPSC_RCRR_m = v;
writel(v, pi->shared_regs->mpsc_routing_base + MPSC_RCRR);
v = pi->shared_regs->MPSC_TCRR_m;
v = (v & ~0xf0f) | 0x100;
pi->shared_regs->MPSC_TCRR_m = v;
writel(v, pi->shared_regs->mpsc_routing_base + MPSC_TCRR);
} else {
v = readl(pi->shared_regs->mpsc_routing_base + MPSC_MRR);
v &= ~0x1c7;
writel(v, pi->shared_regs->mpsc_routing_base + MPSC_MRR);
v = readl(pi->shared_regs->mpsc_routing_base + MPSC_RCRR);
v = (v & ~0xf0f) | 0x100;
writel(v, pi->shared_regs->mpsc_routing_base + MPSC_RCRR);
v = readl(pi->shared_regs->mpsc_routing_base + MPSC_TCRR);
v = (v & ~0xf0f) | 0x100;
writel(v, pi->shared_regs->mpsc_routing_base + MPSC_TCRR);
}
/* Put MPSC in UART mode & enabel Tx/Rx egines */
writel(0x000004c4, pi->mpsc_base + MPSC_MMCRL);
/* No preamble, 16x divider, low-latency, */
writel(0x04400400, pi->mpsc_base + MPSC_MMCRH);
mpsc_set_baudrate(pi, pi->default_baud);
if (pi->mirror_regs) {
pi->MPSC_CHR_1_m = 0;
pi->MPSC_CHR_2_m = 0;
}
writel(0, pi->mpsc_base + MPSC_CHR_1);
writel(0, pi->mpsc_base + MPSC_CHR_2);
writel(pi->mpsc_max_idle, pi->mpsc_base + MPSC_CHR_3);
writel(0, pi->mpsc_base + MPSC_CHR_4);
writel(0, pi->mpsc_base + MPSC_CHR_5);
writel(0, pi->mpsc_base + MPSC_CHR_6);
writel(0, pi->mpsc_base + MPSC_CHR_7);
writel(0, pi->mpsc_base + MPSC_CHR_8);
writel(0, pi->mpsc_base + MPSC_CHR_9);
writel(0, pi->mpsc_base + MPSC_CHR_10);
}
static void mpsc_enter_hunt(struct mpsc_port_info *pi)
{
pr_debug("mpsc_enter_hunt[%d]: Hunting...\n", pi->port.line);
if (pi->mirror_regs) {
writel(pi->MPSC_CHR_2_m | MPSC_CHR_2_EH,
pi->mpsc_base + MPSC_CHR_2);
/* Erratum prevents reading CHR_2 so just delay for a while */
udelay(100);
} else {
writel(readl(pi->mpsc_base + MPSC_CHR_2) | MPSC_CHR_2_EH,
pi->mpsc_base + MPSC_CHR_2);
while (readl(pi->mpsc_base + MPSC_CHR_2) & MPSC_CHR_2_EH)
udelay(10);
}
}
static void mpsc_freeze(struct mpsc_port_info *pi)
{
u32 v;
pr_debug("mpsc_freeze[%d]: Freezing\n", pi->port.line);
v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
readl(pi->mpsc_base + MPSC_MPCR);
v |= MPSC_MPCR_FRZ;
if (pi->mirror_regs)
pi->MPSC_MPCR_m = v;
writel(v, pi->mpsc_base + MPSC_MPCR);
}
static void mpsc_unfreeze(struct mpsc_port_info *pi)
{
u32 v;
v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
readl(pi->mpsc_base + MPSC_MPCR);
v &= ~MPSC_MPCR_FRZ;
if (pi->mirror_regs)
pi->MPSC_MPCR_m = v;
writel(v, pi->mpsc_base + MPSC_MPCR);
pr_debug("mpsc_unfreeze[%d]: Unfrozen\n", pi->port.line);
}
static void mpsc_set_char_length(struct mpsc_port_info *pi, u32 len)
{
u32 v;
pr_debug("mpsc_set_char_length[%d]: char len: %d\n", pi->port.line,len);
v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
readl(pi->mpsc_base + MPSC_MPCR);
v = (v & ~(0x3 << 12)) | ((len & 0x3) << 12);
if (pi->mirror_regs)
pi->MPSC_MPCR_m = v;
writel(v, pi->mpsc_base + MPSC_MPCR);
}
static void mpsc_set_stop_bit_length(struct mpsc_port_info *pi, u32 len)
{
u32 v;
pr_debug("mpsc_set_stop_bit_length[%d]: stop bits: %d\n",
pi->port.line, len);
v = (pi->mirror_regs) ? pi->MPSC_MPCR_m :
readl(pi->mpsc_base + MPSC_MPCR);
v = (v & ~(1 << 14)) | ((len & 0x1) << 14);
if (pi->mirror_regs)
pi->MPSC_MPCR_m = v;
writel(v, pi->mpsc_base + MPSC_MPCR);
}
static void mpsc_set_parity(struct mpsc_port_info *pi, u32 p)
{
u32 v;
pr_debug("mpsc_set_parity[%d]: parity bits: 0x%x\n", pi->port.line, p);
v = (pi->mirror_regs) ? pi->MPSC_CHR_2_m :
readl(pi->mpsc_base + MPSC_CHR_2);
p &= 0x3;
v = (v & ~0xc000c) | (p << 18) | (p << 2);
if (pi->mirror_regs)
pi->MPSC_CHR_2_m = v;
writel(v, pi->mpsc_base + MPSC_CHR_2);
}
/*
******************************************************************************
*
* Driver Init Routines
*
******************************************************************************
*/
static void mpsc_init_hw(struct mpsc_port_info *pi)
{
pr_debug("mpsc_init_hw[%d]: Initializing\n", pi->port.line);
mpsc_brg_init(pi, pi->brg_clk_src);
mpsc_brg_enable(pi);
mpsc_sdma_init(pi, dma_get_cache_alignment()); /* burst a cacheline */
mpsc_sdma_stop(pi);
mpsc_hw_init(pi);
}
static int mpsc_alloc_ring_mem(struct mpsc_port_info *pi)
{
int rc = 0;
pr_debug("mpsc_alloc_ring_mem[%d]: Allocating ring mem\n",
pi->port.line);
if (!pi->dma_region) {
if (!dma_supported(pi->port.dev, 0xffffffff)) {
printk(KERN_ERR "MPSC: Inadequate DMA support\n");
rc = -ENXIO;
} else if ((pi->dma_region = dma_alloc_noncoherent(pi->port.dev,
MPSC_DMA_ALLOC_SIZE,
&pi->dma_region_p, GFP_KERNEL))
== NULL) {
printk(KERN_ERR "MPSC: Can't alloc Desc region\n");
rc = -ENOMEM;
}
}
return rc;
}
static void mpsc_free_ring_mem(struct mpsc_port_info *pi)
{
pr_debug("mpsc_free_ring_mem[%d]: Freeing ring mem\n", pi->port.line);
if (pi->dma_region) {
dma_free_noncoherent(pi->port.dev, MPSC_DMA_ALLOC_SIZE,
pi->dma_region, pi->dma_region_p);
pi->dma_region = NULL;
pi->dma_region_p = (dma_addr_t)NULL;
}
}
static void mpsc_init_rings(struct mpsc_port_info *pi)
{
struct mpsc_rx_desc *rxre;
struct mpsc_tx_desc *txre;
dma_addr_t dp, dp_p;
u8 *bp, *bp_p;
int i;
pr_debug("mpsc_init_rings[%d]: Initializing rings\n", pi->port.line);
BUG_ON(pi->dma_region == NULL);
memset(pi->dma_region, 0, MPSC_DMA_ALLOC_SIZE);
/*
* Descriptors & buffers are multiples of cacheline size and must be
* cacheline aligned.
*/
dp = ALIGN((u32)pi->dma_region, dma_get_cache_alignment());
dp_p = ALIGN((u32)pi->dma_region_p, dma_get_cache_alignment());
/*
* Partition dma region into rx ring descriptor, rx buffers,
* tx ring descriptors, and tx buffers.
*/
pi->rxr = dp;
pi->rxr_p = dp_p;
dp += MPSC_RXR_SIZE;
dp_p += MPSC_RXR_SIZE;
pi->rxb = (u8 *)dp;
pi->rxb_p = (u8 *)dp_p;
dp += MPSC_RXB_SIZE;
dp_p += MPSC_RXB_SIZE;
pi->rxr_posn = 0;
pi->txr = dp;
pi->txr_p = dp_p;
dp += MPSC_TXR_SIZE;
dp_p += MPSC_TXR_SIZE;
pi->txb = (u8 *)dp;
pi->txb_p = (u8 *)dp_p;
pi->txr_head = 0;
pi->txr_tail = 0;
/* Init rx ring descriptors */
dp = pi->rxr;
dp_p = pi->rxr_p;
bp = pi->rxb;
bp_p = pi->rxb_p;
for (i = 0; i < MPSC_RXR_ENTRIES; i++) {
rxre = (struct mpsc_rx_desc *)dp;
rxre->bufsize = cpu_to_be16(MPSC_RXBE_SIZE);
rxre->bytecnt = cpu_to_be16(0);
rxre->cmdstat = cpu_to_be32(SDMA_DESC_CMDSTAT_O
| SDMA_DESC_CMDSTAT_EI | SDMA_DESC_CMDSTAT_F
| SDMA_DESC_CMDSTAT_L);
rxre->link = cpu_to_be32(dp_p + MPSC_RXRE_SIZE);
rxre->buf_ptr = cpu_to_be32(bp_p);
dp += MPSC_RXRE_SIZE;
dp_p += MPSC_RXRE_SIZE;
bp += MPSC_RXBE_SIZE;
bp_p += MPSC_RXBE_SIZE;
}
rxre->link = cpu_to_be32(pi->rxr_p); /* Wrap last back to first */
/* Init tx ring descriptors */
dp = pi->txr;
dp_p = pi->txr_p;
bp = pi->txb;
bp_p = pi->txb_p;
for (i = 0; i < MPSC_TXR_ENTRIES; i++) {
txre = (struct mpsc_tx_desc *)dp;
txre->link = cpu_to_be32(dp_p + MPSC_TXRE_SIZE);
txre->buf_ptr = cpu_to_be32(bp_p);
dp += MPSC_TXRE_SIZE;
dp_p += MPSC_TXRE_SIZE;
bp += MPSC_TXBE_SIZE;
bp_p += MPSC_TXBE_SIZE;
}
txre->link = cpu_to_be32(pi->txr_p); /* Wrap last back to first */
dma_cache_sync(pi->port.dev, (void *)pi->dma_region,
MPSC_DMA_ALLOC_SIZE, DMA_BIDIRECTIONAL);
#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
flush_dcache_range((ulong)pi->dma_region,
(ulong)pi->dma_region
+ MPSC_DMA_ALLOC_SIZE);
#endif
return;
}
static void mpsc_uninit_rings(struct mpsc_port_info *pi)
{
pr_debug("mpsc_uninit_rings[%d]: Uninitializing rings\n",pi->port.line);
BUG_ON(pi->dma_region == NULL);
pi->rxr = 0;
pi->rxr_p = 0;
pi->rxb = NULL;
pi->rxb_p = NULL;
pi->rxr_posn = 0;
pi->txr = 0;
pi->txr_p = 0;
pi->txb = NULL;
pi->txb_p = NULL;
pi->txr_head = 0;
pi->txr_tail = 0;
}
static int mpsc_make_ready(struct mpsc_port_info *pi)
{
int rc;
pr_debug("mpsc_make_ready[%d]: Making cltr ready\n", pi->port.line);
if (!pi->ready) {
mpsc_init_hw(pi);
if ((rc = mpsc_alloc_ring_mem(pi)))
return rc;
mpsc_init_rings(pi);
pi->ready = 1;
}
return 0;
}
#ifdef CONFIG_CONSOLE_POLL
static int serial_polled;
#endif
/*
******************************************************************************
*
* Interrupt Handling Routines
*
******************************************************************************
*/
static int mpsc_rx_intr(struct mpsc_port_info *pi)
{
struct mpsc_rx_desc *rxre;
struct tty_struct *tty = pi->port.info->port.tty;
u32 cmdstat, bytes_in, i;
int rc = 0;
u8 *bp;
char flag = TTY_NORMAL;
pr_debug("mpsc_rx_intr[%d]: Handling Rx intr\n", pi->port.line);
rxre = (struct mpsc_rx_desc *)(pi->rxr + (pi->rxr_posn*MPSC_RXRE_SIZE));
dma_cache_sync(pi->port.dev, (void *)rxre, MPSC_RXRE_SIZE,
DMA_FROM_DEVICE);
#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
invalidate_dcache_range((ulong)rxre,
(ulong)rxre + MPSC_RXRE_SIZE);
#endif
/*
* Loop through Rx descriptors handling ones that have been completed.
*/
while (!((cmdstat = be32_to_cpu(rxre->cmdstat))
& SDMA_DESC_CMDSTAT_O)) {
bytes_in = be16_to_cpu(rxre->bytecnt);
#ifdef CONFIG_CONSOLE_POLL
if (unlikely(serial_polled)) {
serial_polled = 0;
return 0;
}
#endif
/* Following use of tty struct directly is deprecated */
if (unlikely(tty_buffer_request_room(tty, bytes_in)
< bytes_in)) {
if (tty->low_latency)
tty_flip_buffer_push(tty);
/*
* If this failed then we will throw away the bytes
* but must do so to clear interrupts.
*/
}
bp = pi->rxb + (pi->rxr_posn * MPSC_RXBE_SIZE);
dma_cache_sync(pi->port.dev, (void *)bp, MPSC_RXBE_SIZE,
DMA_FROM_DEVICE);
#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
if (pi->cache_mgmt) /* GT642[46]0 Res #COMM-2 */
invalidate_dcache_range((ulong)bp,
(ulong)bp + MPSC_RXBE_SIZE);
#endif
/*
* Other than for parity error, the manual provides little
* info on what data will be in a frame flagged by any of
* these errors. For parity error, it is the last byte in
* the buffer that had the error. As for the rest, I guess
* we'll assume there is no data in the buffer.
* If there is...it gets lost.
*/
if (unlikely(cmdstat & (SDMA_DESC_CMDSTAT_BR
| SDMA_DESC_CMDSTAT_FR
| SDMA_DESC_CMDSTAT_OR))) {