forked from Minki/linux
[POWERPC] Add of_platform_bus support to mpc52xx psc uart driver
Needed to support mpc52xx boards in arch/powerpc. This patch retains the platform_bus support when compiling for arch/ppc, but uses the of_platform bindings for arch/powerpc. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Sylvain Munaut <tnt@246tNt.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Grant Likely
Paul Mackerras
parent
9b9129e739
commit
b9272dfdfe
@ -16,7 +16,9 @@
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* Some of the code has been inspired/copied from the 2.4 code written
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* by Dale Farnsworth <dfarnsworth@mvista.com>.
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*
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* Copyright (C) 2004-2005 Sylvain Munaut <tnt@246tNt.com>
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* Copyright (C) 2006 Secret Lab Technologies Ltd.
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* Grant Likely <grant.likely@secretlab.ca>
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* Copyright (C) 2004-2006 Sylvain Munaut <tnt@246tNt.com>
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* Copyright (C) 2003 MontaVista, Software, Inc.
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*
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* This file is licensed under the terms of the GNU General Public License
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@ -42,7 +44,24 @@
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* will be mapped to.
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*/
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#include <linux/platform_device.h>
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/* OF Platform device Usage :
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*
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* This driver is only used for PSCs configured in uart mode. The device
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* tree will have a node for each PSC in uart mode w/ device_type = "serial"
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* and "mpc52xx-psc-uart" in the compatible string
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*
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* By default, PSC devices are enumerated in the order they are found. However
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* a particular PSC number can be forces by adding 'device_no = <port#>'
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* to the device node.
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*
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* The driver init all necessary registers to place the PSC in uart mode without
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* DCD. However, the pin multiplexing aren't changed and should be set either
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* by the bootloader or in the platform init code.
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*/
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#undef DEBUG
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/tty.h>
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#include <linux/serial.h>
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@ -52,6 +71,12 @@
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#include <asm/delay.h>
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#include <asm/io.h>
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#if defined(CONFIG_PPC_MERGE)
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#include <asm/of_platform.h>
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#else
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#include <linux/platform_device.h>
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#endif
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#include <asm/mpc52xx.h>
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#include <asm/mpc52xx_psc.h>
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@ -78,6 +103,12 @@ static struct uart_port mpc52xx_uart_ports[MPC52xx_PSC_MAXNUM];
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* it's cleared, then a memset(...,0,...) should be added to
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* the console_init
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*/
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#if defined(CONFIG_PPC_MERGE)
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/* lookup table for matching device nodes to index numbers */
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static struct device_node *mpc52xx_uart_nodes[MPC52xx_PSC_MAXNUM];
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static void mpc52xx_uart_of_enumerate(void);
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#endif
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#define PSC(port) ((struct mpc52xx_psc __iomem *)((port)->membase))
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@ -94,6 +125,14 @@ static irqreturn_t mpc52xx_uart_int(int irq,void *dev_id);
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#define uart_console(port) (0)
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#endif
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#if defined(CONFIG_PPC_MERGE)
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static struct of_device_id mpc52xx_uart_of_match[] = {
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{ .type = "serial", .compatible = "mpc52xx-psc-uart", },
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{ .type = "serial", .compatible = "mpc5200-psc", }, /* Efika only! */
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{},
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};
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#endif
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/* ======================================================================== */
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/* UART operations */
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@ -330,7 +369,7 @@ mpc52xx_uart_release_port(struct uart_port *port)
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port->membase = NULL;
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}
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release_mem_region(port->mapbase, MPC52xx_PSC_SIZE);
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release_mem_region(port->mapbase, sizeof(struct mpc52xx_psc));
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}
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static int
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@ -339,12 +378,13 @@ mpc52xx_uart_request_port(struct uart_port *port)
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int err;
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if (port->flags & UPF_IOREMAP) /* Need to remap ? */
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port->membase = ioremap(port->mapbase, MPC52xx_PSC_SIZE);
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port->membase = ioremap(port->mapbase,
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sizeof(struct mpc52xx_psc));
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if (!port->membase)
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return -EINVAL;
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err = request_mem_region(port->mapbase, MPC52xx_PSC_SIZE,
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err = request_mem_region(port->mapbase, sizeof(struct mpc52xx_psc),
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"mpc52xx_psc_uart") != NULL ? 0 : -EBUSY;
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if (err && (port->flags & UPF_IOREMAP)) {
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@ -561,13 +601,18 @@ mpc52xx_console_get_options(struct uart_port *port,
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struct mpc52xx_psc __iomem *psc = PSC(port);
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unsigned char mr1;
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pr_debug("mpc52xx_console_get_options(port=%p)\n", port);
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/* Read the mode registers */
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out_8(&psc->command,MPC52xx_PSC_SEL_MODE_REG_1);
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mr1 = in_8(&psc->mode);
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/* CT{U,L}R are write-only ! */
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*baud = __res.bi_baudrate ?
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__res.bi_baudrate : CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
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*baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
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#if !defined(CONFIG_PPC_MERGE)
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if (__res.bi_baudrate)
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*baud = __res.bi_baudrate;
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#endif
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/* Parse them */
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switch (mr1 & MPC52xx_PSC_MODE_BITS_MASK) {
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@ -620,6 +665,7 @@ mpc52xx_console_write(struct console *co, const char *s, unsigned int count)
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out_be16(&psc->mpc52xx_psc_imr, port->read_status_mask);
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}
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#if !defined(CONFIG_PPC_MERGE)
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static int __init
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mpc52xx_console_setup(struct console *co, char *options)
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{
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@ -654,6 +700,78 @@ mpc52xx_console_setup(struct console *co, char *options)
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return uart_set_options(port, co, baud, parity, bits, flow);
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}
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#else
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static int __init
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mpc52xx_console_setup(struct console *co, char *options)
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{
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struct uart_port *port = &mpc52xx_uart_ports[co->index];
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struct device_node *np = mpc52xx_uart_nodes[co->index];
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unsigned int ipb_freq;
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struct resource res;
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int ret;
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int baud = CONFIG_SERIAL_MPC52xx_CONSOLE_BAUD;
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int bits = 8;
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int parity = 'n';
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int flow = 'n';
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pr_debug("mpc52xx_console_setup co=%p, co->index=%i, options=%s\n",
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co, co->index, options);
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if ((co->index < 0) || (co->index > MPC52xx_PSC_MAXNUM)) {
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pr_debug("PSC%x out of range\n", co->index);
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return -EINVAL;
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}
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if (!np) {
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pr_debug("PSC%x not found in device tree\n", co->index);
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return -EINVAL;
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}
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pr_debug("Console on ttyPSC%x is %s\n",
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co->index, mpc52xx_uart_nodes[co->index]->full_name);
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/* Fetch register locations */
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if ((ret = of_address_to_resource(np, 0, &res)) != 0) {
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pr_debug("Could not get resources for PSC%x\n", co->index);
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return ret;
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}
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/* Search for bus-frequency property in this node or a parent */
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if ((ipb_freq = mpc52xx_find_ipb_freq(np)) == 0) {
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pr_debug("Could not find IPB bus frequency!\n");
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return -EINVAL;
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}
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/* Basic port init. Needed since we use some uart_??? func before
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* real init for early access */
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spin_lock_init(&port->lock);
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port->uartclk = ipb_freq / 2;
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port->ops = &mpc52xx_uart_ops;
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port->mapbase = res.start;
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port->membase = ioremap(res.start, sizeof(struct mpc52xx_psc));
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port->irq = irq_of_parse_and_map(np, 0);
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if (port->membase == NULL)
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return -EINVAL;
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pr_debug("mpc52xx-psc uart at %lx, mapped to %p, irq=%x, freq=%i\n",
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port->mapbase, port->membase, port->irq, port->uartclk);
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/* Setup the port parameters accoding to options */
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if (options)
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uart_parse_options(options, &baud, &parity, &bits, &flow);
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else
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mpc52xx_console_get_options(port, &baud, &parity, &bits, &flow);
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pr_debug("Setting console parameters: %i %i%c1 flow=%c\n",
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baud, bits, parity, flow);
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return uart_set_options(port, co, baud, parity, bits, flow);
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}
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#endif /* defined(CONFIG_PPC_MERGE) */
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static struct uart_driver mpc52xx_uart_driver;
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@ -671,6 +789,7 @@ static struct console mpc52xx_console = {
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static int __init
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mpc52xx_console_init(void)
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{
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mpc52xx_uart_of_enumerate();
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register_console(&mpc52xx_console);
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return 0;
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}
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@ -698,6 +817,7 @@ static struct uart_driver mpc52xx_uart_driver = {
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};
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#if !defined(CONFIG_PPC_MERGE)
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/* ======================================================================== */
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/* Platform Driver */
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/* ======================================================================== */
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@ -721,8 +841,6 @@ mpc52xx_uart_probe(struct platform_device *dev)
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/* Init the port structure */
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port = &mpc52xx_uart_ports[idx];
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memset(port, 0x00, sizeof(struct uart_port));
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spin_lock_init(&port->lock);
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port->uartclk = __res.bi_ipbfreq / 2; /* Look at CTLR doc */
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port->fifosize = 512;
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@ -731,6 +849,7 @@ mpc52xx_uart_probe(struct platform_device *dev)
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( uart_console(port) ? 0 : UPF_IOREMAP );
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port->line = idx;
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port->ops = &mpc52xx_uart_ops;
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port->dev = &dev->dev;
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/* Search for IRQ and mapbase */
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for (i=0 ; i<dev->num_resources ; i++, res++) {
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@ -787,6 +906,7 @@ mpc52xx_uart_resume(struct platform_device *dev)
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}
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#endif
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static struct platform_driver mpc52xx_uart_platform_driver = {
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.probe = mpc52xx_uart_probe,
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.remove = mpc52xx_uart_remove,
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@ -798,6 +918,184 @@ static struct platform_driver mpc52xx_uart_platform_driver = {
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.name = "mpc52xx-psc",
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},
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};
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#endif /* !defined(CONFIG_PPC_MERGE) */
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#if defined(CONFIG_PPC_MERGE)
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/* ======================================================================== */
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/* OF Platform Driver */
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/* ======================================================================== */
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static int __devinit
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mpc52xx_uart_of_probe(struct of_device *op, const struct of_device_id *match)
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{
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int idx = -1;
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unsigned int ipb_freq;
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struct uart_port *port = NULL;
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struct resource res;
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int ret;
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dev_dbg(&op->dev, "mpc52xx_uart_probe(op=%p, match=%p)\n", op, match);
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/* Check validity & presence */
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for (idx = 0; idx < MPC52xx_PSC_MAXNUM; idx++)
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if (mpc52xx_uart_nodes[idx] == op->node)
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break;
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if (idx >= MPC52xx_PSC_MAXNUM)
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return -EINVAL;
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pr_debug("Found %s assigned to ttyPSC%x\n",
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mpc52xx_uart_nodes[idx]->full_name, idx);
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/* Search for bus-frequency property in this node or a parent */
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if ((ipb_freq = mpc52xx_find_ipb_freq(op->node)) == 0) {
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dev_dbg(&op->dev, "Could not find IPB bus frequency!\n");
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return -EINVAL;
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}
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/* Init the port structure */
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port = &mpc52xx_uart_ports[idx];
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spin_lock_init(&port->lock);
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port->uartclk = ipb_freq / 2;
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port->fifosize = 512;
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port->iotype = UPIO_MEM;
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port->flags = UPF_BOOT_AUTOCONF |
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( uart_console(port) ? 0 : UPF_IOREMAP );
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port->line = idx;
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port->ops = &mpc52xx_uart_ops;
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port->dev = &op->dev;
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/* Search for IRQ and mapbase */
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if ((ret = of_address_to_resource(op->node, 0, &res)) != 0)
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return ret;
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port->mapbase = res.start;
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port->irq = irq_of_parse_and_map(op->node, 0);
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dev_dbg(&op->dev, "mpc52xx-psc uart at %lx, irq=%x, freq=%i\n",
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port->mapbase, port->irq, port->uartclk);
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if ((port->irq==NO_IRQ) || !port->mapbase) {
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printk(KERN_ERR "Could not allocate resources for PSC\n");
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return -EINVAL;
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}
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/* Add the port to the uart sub-system */
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ret = uart_add_one_port(&mpc52xx_uart_driver, port);
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if (!ret)
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dev_set_drvdata(&op->dev, (void*)port);
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return ret;
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}
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static int
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mpc52xx_uart_of_remove(struct of_device *op)
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{
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struct uart_port *port = dev_get_drvdata(&op->dev);
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dev_set_drvdata(&op->dev, NULL);
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if (port)
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uart_remove_one_port(&mpc52xx_uart_driver, port);
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return 0;
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}
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#ifdef CONFIG_PM
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static int
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mpc52xx_uart_of_suspend(struct of_device *op, pm_message_t state)
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{
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struct uart_port *port = (struct uart_port *) dev_get_drvdata(&op->dev);
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if (port)
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uart_suspend_port(&mpc52xx_uart_driver, port);
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return 0;
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}
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static int
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mpc52xx_uart_of_resume(struct of_device *op)
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{
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struct uart_port *port = (struct uart_port *) dev_get_drvdata(&op->dev);
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if (port)
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uart_resume_port(&mpc52xx_uart_driver, port);
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return 0;
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}
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#endif
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static void
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mpc52xx_uart_of_assign(struct device_node *np, int idx)
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{
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int free_idx = -1;
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int i;
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/* Find the first free node */
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for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
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if (mpc52xx_uart_nodes[i] == NULL) {
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free_idx = i;
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break;
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}
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}
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if ((idx < 0) || (idx >= MPC52xx_PSC_MAXNUM))
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idx = free_idx;
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if (idx < 0)
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return; /* No free slot; abort */
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/* If the slot is already occupied, then swap slots */
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if (mpc52xx_uart_nodes[idx] && (free_idx != -1))
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mpc52xx_uart_nodes[free_idx] = mpc52xx_uart_nodes[idx];
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mpc52xx_uart_nodes[i] = np;
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}
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static void
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mpc52xx_uart_of_enumerate(void)
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{
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static int enum_done = 0;
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struct device_node *np;
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const unsigned int *devno;
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int i;
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if (enum_done)
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return;
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for_each_node_by_type(np, "serial") {
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if (!of_match_node(mpc52xx_uart_of_match, np))
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continue;
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/* Is a particular device number requested? */
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devno = get_property(np, "device_no", NULL);
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mpc52xx_uart_of_assign(of_node_get(np), devno ? *devno : -1);
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}
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enum_done = 1;
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for (i = 0; i < MPC52xx_PSC_MAXNUM; i++) {
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if (mpc52xx_uart_nodes[i])
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pr_debug("%s assigned to ttyPSC%x\n",
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mpc52xx_uart_nodes[i]->full_name, i);
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}
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}
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MODULE_DEVICE_TABLE(of, mpc52xx_uart_of_match);
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static struct of_platform_driver mpc52xx_uart_of_driver = {
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.owner = THIS_MODULE,
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.name = "mpc52xx-psc-uart",
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.match_table = mpc52xx_uart_of_match,
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.probe = mpc52xx_uart_of_probe,
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.remove = mpc52xx_uart_of_remove,
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#ifdef CONFIG_PM
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.suspend = mpc52xx_uart_of_suspend,
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.resume = mpc52xx_uart_of_resume,
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#endif
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.driver = {
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.name = "mpc52xx-psc-uart",
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},
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};
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#endif /* defined(CONFIG_PPC_MERGE) */
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/* ======================================================================== */
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@ -809,22 +1107,45 @@ mpc52xx_uart_init(void)
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{
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int ret;
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printk(KERN_INFO "Serial: MPC52xx PSC driver\n");
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printk(KERN_INFO "Serial: MPC52xx PSC UART driver\n");
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ret = uart_register_driver(&mpc52xx_uart_driver);
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if (ret == 0) {
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||||
ret = platform_driver_register(&mpc52xx_uart_platform_driver);
|
||||
if (ret)
|
||||
uart_unregister_driver(&mpc52xx_uart_driver);
|
||||
if ((ret = uart_register_driver(&mpc52xx_uart_driver)) != 0) {
|
||||
printk(KERN_ERR "%s: uart_register_driver failed (%i)\n",
|
||||
__FILE__, ret);
|
||||
return ret;
|
||||
}
|
||||
|
||||
return ret;
|
||||
#if defined(CONFIG_PPC_MERGE)
|
||||
mpc52xx_uart_of_enumerate();
|
||||
|
||||
ret = of_register_platform_driver(&mpc52xx_uart_of_driver);
|
||||
if (ret) {
|
||||
printk(KERN_ERR "%s: of_register_platform_driver failed (%i)\n",
|
||||
__FILE__, ret);
|
||||
uart_unregister_driver(&mpc52xx_uart_driver);
|
||||
return ret;
|
||||
}
|
||||
#else
|
||||
ret = platform_driver_register(&mpc52xx_uart_platform_driver);
|
||||
if (ret) {
|
||||
printk(KERN_ERR "%s: platform_driver_register failed (%i)\n",
|
||||
__FILE__, ret);
|
||||
uart_unregister_driver(&mpc52xx_uart_driver);
|
||||
return ret;
|
||||
}
|
||||
#endif
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __exit
|
||||
mpc52xx_uart_exit(void)
|
||||
{
|
||||
#if defined(CONFIG_PPC_MERGE)
|
||||
of_unregister_platform_driver(&mpc52xx_uart_of_driver);
|
||||
#else
|
||||
platform_driver_unregister(&mpc52xx_uart_platform_driver);
|
||||
#endif
|
||||
uart_unregister_driver(&mpc52xx_uart_driver);
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user