pmac-zilog: add platform driver

Add platform driver support to the pmac-zilog driver, for m68k macs.
Place the powermac-specific code inside #ifdef CONFIG_PPC_PMAC.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

3 files changed, 156 insertions, 25 deletions

diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
index 9ff47db0b2c..888a0ce91c4 100644
--- a/drivers/serial/Kconfig
+++ b/drivers/serial/Kconfig
@@ -1086,12 +1086,12 @@ config SERIAL_68360
         default y
 
 config SERIAL_PMACZILOG
-        tristate "PowerMac z85c30 ESCC support"
-        depends on PPC_OF && PPC_PMAC
+        tristate "Mac or PowerMac z85c30 ESCC support"
+        depends on (M68K && MAC) || (PPC_OF && PPC_PMAC)
         select SERIAL_CORE
         help
           This driver supports the Zilog z85C30 serial ports found on
-          PowerMac machines.
+          (Power)Mac machines.
           Say Y or M if you want to be able to these serial ports.
 
 config SERIAL_PMACZILOG_TTYS
@@ -1116,16 +1116,16 @@ config SERIAL_PMACZILOG_TTYS
           unable to use the 8250 module for PCMCIA or other 16C550-style
           UARTs.
 
-          Say N unless you need the z85c30 ports on your powermac
+          Say N unless you need the z85c30 ports on your (Power)Mac
           to appear as /dev/ttySn.
 
 config SERIAL_PMACZILOG_CONSOLE
-        bool "Console on PowerMac z85c30 serial port"
+        bool "Console on Mac or PowerMac z85c30 serial port"
         depends on SERIAL_PMACZILOG=y
         select SERIAL_CORE_CONSOLE
         help
           If you would like to be able to use the z85c30 serial port
-          on your PowerMac as the console, you can do so by answering
+          on your (Power)Mac as the console, you can do so by answering
           Y to this option.
 
 config SERIAL_LH7A40X
diff --git a/drivers/serial/pmac_zilog.c b/drivers/serial/pmac_zilog.c
index 1c8afd98e14..f020de1cdd5 100644
--- a/drivers/serial/pmac_zilog.c
+++ b/drivers/serial/pmac_zilog.c
@@ -63,11 +63,17 @@
 #include <asm/sections.h>
 #include <asm/io.h>
 #include <asm/irq.h>
+
+#ifdef CONFIG_PPC_PMAC
 #include <asm/prom.h>
 #include <asm/machdep.h>
 #include <asm/pmac_feature.h>
 #include <asm/dbdma.h>
 #include <asm/macio.h>
+#else
+#include <linux/platform_device.h>
+#define of_machine_is_compatible(x) (0)
+#endif
 
 #if defined (CONFIG_SERIAL_PMACZILOG_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
 #define SUPPORT_SYSRQ
@@ -83,11 +89,9 @@
 
 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 PowerMac serial ports.");
+MODULE_DESCRIPTION("Driver for the Mac and PowerMac serial ports.");
 MODULE_LICENSE("GPL");
 
-#define PWRDBG(fmt, arg...)     printk(KERN_DEBUG fmt , ## arg)
-
 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
 #define PMACZILOG_MAJOR         TTY_MAJOR
 #define PMACZILOG_MINOR         64
@@ -341,7 +345,7 @@ static struct tty_struct *pmz_receive_chars(struct uart_pmac_port *uap)
         uap->curregs[R1] &= ~(EXT_INT_ENAB | TxINT_ENAB | RxINT_MASK);
         write_zsreg(uap, R1, uap->curregs[R1]);
         zssync(uap);
-        dev_err(&uap->dev->ofdev.dev, "pmz: rx irq flood !\n");
+        pmz_error("pmz: rx irq flood !\n");
         return tty;
 }
 
@@ -757,6 +761,8 @@ static void pmz_break_ctl(struct uart_port *port, int break_state)
         spin_unlock_irqrestore(&port->lock, flags);
 }
 
+#ifdef CONFIG_PPC_PMAC
+
 /*
  * Turn power on or off to the SCC and associated stuff
  * (port drivers, modem, IR port, etc.)
@@ -792,6 +798,15 @@ static int pmz_set_scc_power(struct uart_pmac_port *uap, int state)
         return delay;
 }
 
+#else
+
+static int pmz_set_scc_power(struct uart_pmac_port *uap, int state)
+{
+        return 0;
+}
+
+#endif /* !CONFIG_PPC_PMAC */
+
 /*
  * FixZeroBug....Works around a bug in the SCC receving channel.
  * Inspired from Darwin code, 15 Sept. 2000  -DanM
@@ -954,9 +969,9 @@ static int pmz_startup(struct uart_port *port)
         }       
 
         pmz_get_port_A(uap)->flags |= PMACZILOG_FLAG_IS_IRQ_ON;
-        if (request_irq(uap->port.irq, pmz_interrupt, IRQF_SHARED, "PowerMac Zilog", uap)) {
-                dev_err(&uap->dev->ofdev.dev,
-                        "Unable to register zs interrupt handler.\n");
+        if (request_irq(uap->port.irq, pmz_interrupt, IRQF_SHARED,
+                        "SCC", uap)) {
+                pmz_error("Unable to register zs interrupt handler.\n");
                 pmz_set_scc_power(uap, 0);
                 mutex_unlock(&pmz_irq_mutex);
                 return -ENXIO;
@@ -1196,7 +1211,7 @@ static void pmz_irda_setup(struct uart_pmac_port *uap, unsigned long *baud)
         while ((read_zsreg(uap, R0) & Tx_BUF_EMP) == 0
                || (read_zsreg(uap, R1) & ALL_SNT) == 0) {
                 if (--t <= 0) {
-                        dev_err(&uap->dev->ofdev.dev, "transmitter didn't drain\n");
+                        pmz_error("transmitter didn't drain\n");
                         return;
                 }
                 udelay(10);
@@ -1212,7 +1227,7 @@ static void pmz_irda_setup(struct uart_pmac_port *uap, unsigned long *baud)
                 read_zsdata(uap);
                 mdelay(10);
                 if (--t <= 0) {
-                        dev_err(&uap->dev->ofdev.dev, "receiver didn't drain\n");
+                        pmz_error("receiver didn't drain\n");
                         return;
                 }
         }
@@ -1233,8 +1248,7 @@ static void pmz_irda_setup(struct uart_pmac_port *uap, unsigned long *baud)
         t = 5000;
         while ((read_zsreg(uap, R0) & Rx_CH_AV) == 0) {
                 if (--t <= 0) {
-                        dev_err(&uap->dev->ofdev.dev,
-                                "irda_setup timed out on get_version byte\n");
+                        pmz_error("irda_setup timed out on get_version byte\n");
                         goto out;
                 }
                 udelay(10);
@@ -1242,8 +1256,7 @@ static void pmz_irda_setup(struct uart_pmac_port *uap, unsigned long *baud)
         version = read_zsdata(uap);
 
         if (version < 4) {
-                dev_info(&uap->dev->ofdev.dev, "IrDA: dongle version %d not supported\n",
-                         version);
+                pmz_info("IrDA: dongle version %d not supported\n", version);
                 goto out;
         }
 
@@ -1252,18 +1265,16 @@ static void pmz_irda_setup(struct uart_pmac_port *uap, unsigned long *baud)
         t = 5000;
         while ((read_zsreg(uap, R0) & Rx_CH_AV) == 0) {
                 if (--t <= 0) {
-                        dev_err(&uap->dev->ofdev.dev,
-                                "irda_setup timed out on speed mode byte\n");
+                        pmz_error("irda_setup timed out on speed mode byte\n");
                         goto out;
                 }
                 udelay(10);
         }
         t = read_zsdata(uap);
         if (t != cmdbyte)
-                dev_err(&uap->dev->ofdev.dev,
-                        "irda_setup speed mode byte = %x (%x)\n", t, cmdbyte);
+                pmz_error("irda_setup speed mode byte = %x (%x)\n", t, cmdbyte);
 
-        dev_info(&uap->dev->ofdev.dev, "IrDA setup for %ld bps, dongle version: %d\n",
+        pmz_info("IrDA setup for %ld bps, dongle version: %d\n",
                  *baud, version);
 
         (void)read_zsdata(uap);
@@ -1413,7 +1424,7 @@ static void pmz_poll_put_char(struct uart_port *port, unsigned char c)
         write_zsdata(uap, c);
 }
 
-#endif
+#endif /* CONFIG_CONSOLE_POLL */
 
 static struct uart_ops pmz_pops = {
         .tx_empty       =       pmz_tx_empty,
@@ -1438,6 +1449,8 @@ static struct uart_ops pmz_pops = {
 #endif
 };
 
+#ifdef CONFIG_PPC_PMAC
+
 /*
  * Setup one port structure after probing, HW is down at this point,
  * Unlike sunzilog, we don't need to pre-init the spinlock as we don't
@@ -1834,6 +1847,88 @@ next:
         return 0;
 }
 
+#else
+
+extern struct platform_device scc_a_pdev, scc_b_pdev;
+
+static int __init pmz_init_port(struct uart_pmac_port *uap)
+{
+        struct resource *r_ports;
+        int irq;
+
+        r_ports = platform_get_resource(uap->node, IORESOURCE_MEM, 0);
+        irq = platform_get_irq(uap->node, 0);
+        if (!r_ports || !irq)
+                return -ENODEV;
+
+        uap->port.mapbase  = r_ports->start;
+        uap->port.membase  = (unsigned char __iomem *) r_ports->start;
+        uap->port.iotype   = UPIO_MEM;
+        uap->port.irq      = irq;
+        uap->port.uartclk  = ZS_CLOCK;
+        uap->port.fifosize = 1;
+        uap->port.ops      = &pmz_pops;
+        uap->port.type     = PORT_PMAC_ZILOG;
+        uap->port.flags    = 0;
+
+        uap->control_reg   = uap->port.membase;
+        uap->data_reg      = uap->control_reg + 4;
+        uap->port_type     = 0;
+
+        pmz_convert_to_zs(uap, CS8, 0, 9600);
+
+        return 0;
+}
+
+static int __init pmz_probe(void)
+{
+        int err;
+
+        pmz_ports_count = 0;
+
+        pmz_ports[0].mate      = &pmz_ports[1];
+        pmz_ports[0].port.line = 0;
+        pmz_ports[0].flags     = PMACZILOG_FLAG_IS_CHANNEL_A;
+        pmz_ports[0].node      = &scc_a_pdev;
+        err = pmz_init_port(&pmz_ports[0]);
+        if (err)
+                return err;
+        pmz_ports_count++;
+
+        pmz_ports[1].mate      = &pmz_ports[0];
+        pmz_ports[1].port.line = 1;
+        pmz_ports[1].flags     = 0;
+        pmz_ports[1].node      = &scc_b_pdev;
+        err = pmz_init_port(&pmz_ports[1]);
+        if (err)
+                return err;
+        pmz_ports_count++;
+
+        return 0;
+}
+
+static void pmz_dispose_port(struct uart_pmac_port *uap)
+{
+        memset(uap, 0, sizeof(struct uart_pmac_port));
+}
+
+static int __init pmz_attach(struct platform_device *pdev)
+{
+        int i;
+
+        for (i = 0; i < pmz_ports_count; i++)
+                if (pmz_ports[i].node == pdev)
+                        return 0;
+        return -ENODEV;
+}
+
+static int __exit pmz_detach(struct platform_device *pdev)
+{
+        return 0;
+}
+
+#endif /* !CONFIG_PPC_PMAC */
+
 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
 
 static void pmz_console_write(struct console *con, const char *s, unsigned int count);
@@ -1894,6 +1989,8 @@ err_out:
         return rc;
 }
 
+#ifdef CONFIG_PPC_PMAC
+
 static struct of_device_id pmz_match[] = 
 {
         {
@@ -1915,6 +2012,18 @@ static struct macio_driver pmz_driver = {
         .resume         = pmz_resume,
 };
 
+#else
+
+static struct platform_driver pmz_driver = {
+        .remove         = __exit_p(pmz_detach),
+        .driver         = {
+                .name           = "scc",
+                .owner          = THIS_MODULE,
+        },
+};
+
+#endif /* !CONFIG_PPC_PMAC */
+
 static int __init init_pmz(void)
 {
         int rc, i;
@@ -1953,15 +2062,23 @@ static int __init init_pmz(void)
         /*
          * Then we register the macio driver itself
          */
+#ifdef CONFIG_PPC_PMAC
         return macio_register_driver(&pmz_driver);
+#else
+        return platform_driver_probe(&pmz_driver, pmz_attach);
+#endif
 }
 
 static void __exit exit_pmz(void)
 {
         int i;
 
+#ifdef CONFIG_PPC_PMAC
         /* Get rid of macio-driver (detach from macio) */
         macio_unregister_driver(&pmz_driver);
+#else
+        platform_driver_unregister(&pmz_driver);
+#endif
 
         for (i = 0; i < pmz_ports_count; i++) {
                 struct uart_pmac_port *uport = &pmz_ports[i];
diff --git a/drivers/serial/pmac_zilog.h b/drivers/serial/pmac_zilog.h
index f18c426324a..cbc34fbb1b2 100644
--- a/drivers/serial/pmac_zilog.h
+++ b/drivers/serial/pmac_zilog.h
@@ -1,7 +1,15 @@
 #ifndef __PMAC_ZILOG_H__
 #define __PMAC_ZILOG_H__
 
+#ifdef CONFIG_PPC_PMAC
 #define pmz_debug(fmt, arg...)  dev_dbg(&uap->dev->ofdev.dev, fmt, ## arg)
+#define pmz_error(fmt, arg...)  dev_err(&uap->dev->ofdev.dev, fmt, ## arg)
+#define pmz_info(fmt, arg...)   dev_info(&uap->dev->ofdev.dev, fmt, ## arg)
+#else
+#define pmz_debug(fmt, arg...)  dev_dbg(&uap->node->dev, fmt, ## arg)
+#define pmz_error(fmt, arg...)  dev_err(&uap->node->dev, fmt, ## arg)
+#define pmz_info(fmt, arg...)   dev_info(&uap->node->dev, fmt, ## arg)
+#endif
 
 /*
  * At most 2 ESCCs with 2 ports each
@@ -17,6 +25,7 @@ struct uart_pmac_port {
         struct uart_port                port;
         struct uart_pmac_port           *mate;
 
+#ifdef CONFIG_PPC_PMAC
         /* macio_dev for the escc holding this port (maybe be null on
          * early inited port)
          */
@@ -25,6 +34,9 @@ struct uart_pmac_port {
          * of "escc" node (ie. ch-a or ch-b)
          */
         struct device_node              *node;
+#else
+        struct platform_device          *node;
+#endif
 
         /* Port type as obtained from device tree (IRDA, modem, ...) */
         int                             port_type;
@@ -55,10 +67,12 @@ 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
 
         struct ktermios                 termios_cache;
 };