diff options
| -rw-r--r-- | arch/mips/au1000/common/platform.c | 21 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-au1550.c | 166 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-au1550.h | 32 |
3 files changed, 123 insertions, 96 deletions
diff --git a/arch/mips/au1000/common/platform.c b/arch/mips/au1000/common/platform.c index d51e18fb789..841904cdef4 100644 --- a/arch/mips/au1000/common/platform.c +++ b/arch/mips/au1000/common/platform.c @@ -270,6 +270,24 @@ static struct platform_device smc91x_device = { #endif +/* All Alchemy demoboards with I2C have this #define in their headers */ +#ifdef SMBUS_PSC_BASE +static struct resource pbdb_smbus_resources[] = { + { + .start = SMBUS_PSC_BASE, + .end = SMBUS_PSC_BASE + 0x24 - 1, + .flags = IORESOURCE_MEM, + }, +}; + +static struct platform_device pbdb_smbus_device = { + .name = "au1xpsc_smbus", + .id = 0, /* bus number */ + .num_resources = ARRAY_SIZE(pbdb_smbus_resources), + .resource = pbdb_smbus_resources, +}; +#endif + static struct platform_device *au1xxx_platform_devices[] __initdata = { &au1xxx_usb_ohci_device, &au1x00_pcmcia_device, @@ -287,6 +305,9 @@ static struct platform_device *au1xxx_platform_devices[] __initdata = { #ifdef CONFIG_MIPS_DB1200 &smc91x_device, #endif +#ifdef SMBUS_PSC_BASE + &pbdb_smbus_device, +#endif }; int __init au1xxx_platform_init(void) diff --git a/drivers/i2c/busses/i2c-au1550.c b/drivers/i2c/busses/i2c-au1550.c index 7d51a43b38d..1953b26da56 100644 --- a/drivers/i2c/busses/i2c-au1550.c +++ b/drivers/i2c/busses/i2c-au1550.c @@ -30,14 +30,22 @@ #include <linux/delay.h> #include <linux/kernel.h> #include <linux/module.h> +#include <linux/platform_device.h> #include <linux/init.h> #include <linux/errno.h> #include <linux/i2c.h> +#include <linux/slab.h> #include <asm/mach-au1x00/au1xxx.h> #include <asm/mach-au1x00/au1xxx_psc.h> -#include "i2c-au1550.h" +struct i2c_au1550_data { + u32 psc_base; + int xfer_timeout; + int ack_timeout; + struct i2c_adapter adap; + struct resource *ioarea; +}; static int wait_xfer_done(struct i2c_au1550_data *adap) @@ -299,18 +307,48 @@ static const struct i2c_algorithm au1550_algo = { * Prior to calling us, the 50MHz clock frequency and routing * must have been set up for the PSC indicated by the adapter. */ -int -i2c_au1550_add_bus(struct i2c_adapter *i2c_adap) +static int __devinit +i2c_au1550_probe(struct platform_device *pdev) { - struct i2c_au1550_data *adap = i2c_adap->algo_data; - volatile psc_smb_t *sp; - u32 stat; + struct i2c_au1550_data *priv; + volatile psc_smb_t *sp; + struct resource *r; + u32 stat; + int ret; + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!r) { + ret = -ENODEV; + goto out; + } - i2c_adap->algo = &au1550_algo; + priv = kzalloc(sizeof(struct i2c_au1550_data), GFP_KERNEL); + if (!priv) { + ret = -ENOMEM; + goto out; + } + + priv->ioarea = request_mem_region(r->start, r->end - r->start + 1, + pdev->name); + if (!priv->ioarea) { + ret = -EBUSY; + goto out_mem; + } + + priv->psc_base = r->start; + priv->xfer_timeout = 200; + priv->ack_timeout = 200; + + priv->adap.id = I2C_HW_AU1550_PSC; + priv->adap.nr = pdev->id; + priv->adap.algo = &au1550_algo; + priv->adap.algo_data = priv; + priv->adap.dev.parent = &pdev->dev; + strlcpy(priv->adap.name, "Au1xxx PSC I2C", sizeof(priv->adap.name)); /* Now, set up the PSC for SMBus PIO mode. */ - sp = (volatile psc_smb_t *)(adap->psc_base); + sp = (volatile psc_smb_t *)priv->psc_base; sp->psc_ctrl = PSC_CTRL_DISABLE; au_sync(); sp->psc_sel = PSC_SEL_PS_SMBUSMODE; @@ -348,87 +386,87 @@ i2c_au1550_add_bus(struct i2c_adapter *i2c_adap) au_sync(); } while ((stat & PSC_SMBSTAT_DR) == 0); - return i2c_add_adapter(i2c_adap); -} + ret = i2c_add_numbered_adapter(&priv->adap); + if (ret == 0) { + platform_set_drvdata(pdev, priv); + return 0; + } + + /* disable the PSC */ + sp->psc_smbcfg = 0; + sp->psc_ctrl = PSC_CTRL_DISABLE; + au_sync(); + release_resource(priv->ioarea); + kfree(priv->ioarea); +out_mem: + kfree(priv); +out: + return ret; +} -int -i2c_au1550_del_bus(struct i2c_adapter *adap) +static int __devexit +i2c_au1550_remove(struct platform_device *pdev) { - return i2c_del_adapter(adap); + struct i2c_au1550_data *priv = platform_get_drvdata(pdev); + volatile psc_smb_t *sp = (volatile psc_smb_t *)priv->psc_base; + + platform_set_drvdata(pdev, NULL); + i2c_del_adapter(&priv->adap); + sp->psc_smbcfg = 0; + sp->psc_ctrl = PSC_CTRL_DISABLE; + au_sync(); + release_resource(priv->ioarea); + kfree(priv->ioarea); + kfree(priv); + return 0; } static int -pb1550_reg(struct i2c_client *client) +i2c_au1550_suspend(struct platform_device *pdev, pm_message_t state) { + struct i2c_au1550_data *priv = platform_get_drvdata(pdev); + volatile psc_smb_t *sp = (volatile psc_smb_t *)priv->psc_base; + + sp->psc_ctrl = PSC_CTRL_SUSPEND; + au_sync(); return 0; } static int -pb1550_unreg(struct i2c_client *client) +i2c_au1550_resume(struct platform_device *pdev) { + struct i2c_au1550_data *priv = platform_get_drvdata(pdev); + volatile psc_smb_t *sp = (volatile psc_smb_t *)priv->psc_base; + + sp->psc_ctrl = PSC_CTRL_ENABLE; + au_sync(); + while (!(sp->psc_smbstat & PSC_SMBSTAT_SR)) + au_sync(); return 0; } -static struct i2c_au1550_data pb1550_i2c_info = { - SMBUS_PSC_BASE, 200, 200 -}; - -static struct i2c_adapter pb1550_board_adapter = { - name: "pb1550 adapter", - id: I2C_HW_AU1550_PSC, - algo: NULL, - algo_data: &pb1550_i2c_info, - client_register: pb1550_reg, - client_unregister: pb1550_unreg, +static struct platform_driver au1xpsc_smbus_driver = { + .driver = { + .name = "au1xpsc_smbus", + .owner = THIS_MODULE, + }, + .probe = i2c_au1550_probe, + .remove = __devexit_p(i2c_au1550_remove), + .suspend = i2c_au1550_suspend, + .resume = i2c_au1550_resume, }; -/* BIG hack to support the control interface on the Wolfson WM8731 - * audio codec on the Pb1550 board. We get an address and two data - * bytes to write, create an i2c message, and send it across the - * i2c transfer function. We do this here because we have access to - * the i2c adapter structure. - */ -static struct i2c_msg wm_i2c_msg; /* We don't want this stuff on the stack */ -static u8 i2cbuf[2]; - -int -pb1550_wm_codec_write(u8 addr, u8 reg, u8 val) -{ - wm_i2c_msg.addr = addr; - wm_i2c_msg.flags = 0; - wm_i2c_msg.buf = i2cbuf; - wm_i2c_msg.len = 2; - i2cbuf[0] = reg; - i2cbuf[1] = val; - - return pb1550_board_adapter.algo->master_xfer(&pb1550_board_adapter, &wm_i2c_msg, 1); -} - static int __init i2c_au1550_init(void) { - printk(KERN_INFO "Au1550 I2C: "); - - /* This is where we would set up a 50MHz clock source - * and routing. On the Pb1550, the SMBus is PSC2, which - * uses a shared clock with USB. This has been already - * configured by Yamon as a 48MHz clock, close enough - * for our work. - */ - if (i2c_au1550_add_bus(&pb1550_board_adapter) < 0) { - printk("failed to initialize.\n"); - return -ENODEV; - } - - printk("initialized.\n"); - return 0; + return platform_driver_register(&au1xpsc_smbus_driver); } static void __exit i2c_au1550_exit(void) { - i2c_au1550_del_bus(&pb1550_board_adapter); + platform_driver_unregister(&au1xpsc_smbus_driver); } MODULE_AUTHOR("Dan Malek, Embedded Edge, LLC."); diff --git a/drivers/i2c/busses/i2c-au1550.h b/drivers/i2c/busses/i2c-au1550.h deleted file mode 100644 index fce15d161ae..00000000000 --- a/drivers/i2c/busses/i2c-au1550.h +++ /dev/null @@ -1,32 +0,0 @@ -/* - * Copyright (C) 2004 Embedded Edge, LLC <dan@embeddededge.com> - * 2.6 port by Matt Porter <mporter@kernel.crashing.org> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - */ - -#ifndef I2C_AU1550_H -#define I2C_AU1550_H - -struct i2c_au1550_data { - u32 psc_base; - int xfer_timeout; - int ack_timeout; -}; - -int i2c_au1550_add_bus(struct i2c_adapter *); -int i2c_au1550_del_bus(struct i2c_adapter *); - -#endif /* I2C_AU1550_H */ |