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serial: pmac_zilog: remove unfinished DBDMA support 

The support for DBDMA was never completed. Remove the the code that only
maps spaces without real work.

Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20220519075653.31356-1-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2022-05-19 09:56:50 +02:00 committed by Greg Kroah-Hartman
parent 9bb13b2f77
commit a5ddc498e7
2 changed files with 1 additions and 46 deletions
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38
drivers/tty/serial/pmac_zilog.c
View File

@ -65,9 +65,6 @@
#include "pmac_zilog.h"
/* Not yet implemented */
#undef HAS_DBDMA
static char version[] __initdata = "pmac_zilog: 0.6 (Benjamin Herrenschmidt <benh@kernel.crashing.org>)";
MODULE_AUTHOR("Benjamin Herrenschmidt <benh@kernel.crashing.org>");
MODULE_DESCRIPTION("Driver for the Mac and PowerMac serial ports.");
@ -1399,7 +1396,7 @@ static int __init pmz_init_port(struct uart_pmac_port *uap)
char name[1];
} *slots;
int len;
struct resource r_ports, r_rxdma, r_txdma;
struct resource r_ports;
/*
* Request & map chip registers
@ -1411,35 +1408,6 @@ static int __init pmz_init_port(struct uart_pmac_port *uap)
uap->control_reg = uap->port.membase;
uap->data_reg = uap->control_reg + 0x10;
/*
* Request & map DBDMA registers
*/
#ifdef HAS_DBDMA
if (of_address_to_resource(np, 1, &r_txdma) == 0 &&
of_address_to_resource(np, 2, &r_rxdma) == 0)
uap->flags |= PMACZILOG_FLAG_HAS_DMA;
#else
memset(&r_txdma, 0, sizeof(struct resource));
memset(&r_rxdma, 0, sizeof(struct resource));
#endif
if (ZS_HAS_DMA(uap)) {
uap->tx_dma_regs = ioremap(r_txdma.start, 0x100);
if (uap->tx_dma_regs == NULL) {
uap->flags &= ~PMACZILOG_FLAG_HAS_DMA;
goto no_dma;
}
uap->rx_dma_regs = ioremap(r_rxdma.start, 0x100);
if (uap->rx_dma_regs == NULL) {
iounmap(uap->tx_dma_regs);
uap->tx_dma_regs = NULL;
uap->flags &= ~PMACZILOG_FLAG_HAS_DMA;
goto no_dma;
}
uap->tx_dma_irq = irq_of_parse_and_map(np, 1);
uap->rx_dma_irq = irq_of_parse_and_map(np, 2);
}
no_dma:
/*
* Detect port type
@ -1505,8 +1473,6 @@ no_dma:
of_device_is_compatible(np->parent->parent, "gatwick")) {
/* IRQs on gatwick are offset by 64 */
uap->port.irq = irq_create_mapping(NULL, 64 + 15);
uap->tx_dma_irq = irq_create_mapping(NULL, 64 + 4);
uap->rx_dma_irq = irq_create_mapping(NULL, 64 + 5);
}
/* Setup some valid baud rate information in the register
@ -1526,8 +1492,6 @@ static void pmz_dispose_port(struct uart_pmac_port *uap)
struct device_node *np;
np = uap->node;
iounmap(uap->rx_dma_regs);
iounmap(uap->tx_dma_regs);
iounmap(uap->control_reg);
uap->node = NULL;
of_node_put(np);

9
drivers/tty/serial/pmac_zilog.h
View File

@ -43,7 +43,6 @@ struct uart_pmac_port {
#define PMACZILOG_FLAG_TX_ACTIVE 0x00000040
#define PMACZILOG_FLAG_IS_IRDA 0x00000100
#define PMACZILOG_FLAG_IS_INTMODEM 0x00000200
#define PMACZILOG_FLAG_HAS_DMA 0x00000400
#define PMACZILOG_FLAG_RSRC_REQUESTED 0x00000800
#define PMACZILOG_FLAG_IS_OPEN 0x00002000
#define PMACZILOG_FLAG_IS_EXTCLK 0x00008000
@ -55,13 +54,6 @@ struct uart_pmac_port {
volatile u8 __iomem *control_reg;
volatile u8 __iomem *data_reg;
#ifdef CONFIG_PPC_PMAC
unsigned int tx_dma_irq;
unsigned int rx_dma_irq;
volatile struct dbdma_regs __iomem *tx_dma_regs;
volatile struct dbdma_regs __iomem *rx_dma_regs;
#endif
unsigned char irq_name[8];
struct ktermios termios_cache;
@ -377,7 +369,6 @@ static inline void zssync(struct uart_pmac_port *port)
#define ZS_WANTS_MODEM_STATUS(UP) ((UP)->flags & PMACZILOG_FLAG_MODEM_STATUS)
#define ZS_IS_IRDA(UP) ((UP)->flags & PMACZILOG_FLAG_IS_IRDA)
#define ZS_IS_INTMODEM(UP) ((UP)->flags & PMACZILOG_FLAG_IS_INTMODEM)
#define ZS_HAS_DMA(UP) ((UP)->flags & PMACZILOG_FLAG_HAS_DMA)
#define ZS_IS_OPEN(UP) ((UP)->flags & PMACZILOG_FLAG_IS_OPEN)
#define ZS_IS_EXTCLK(UP) ((UP)->flags & PMACZILOG_FLAG_IS_EXTCLK)