Rev 420 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 420 | giacomo | 1 | /* |
| 2 | * Embedded Planet RPX Lite MPC8xx CPM I2C interface. |
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| 3 | * Copyright (c) 1999 Dan Malek (dmalek@jlc.net). |
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| 4 | * |
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| 5 | * moved into proper i2c interface; |
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| 6 | * Brad Parker (brad@heeltoe.com) |
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| 7 | * |
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| 8 | * RPX lite specific parts of the i2c interface |
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| 9 | * Update: There actually isn't anything RPXLite-specific about this module. |
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| 10 | * This should work for most any 8xx board. The console messages have been |
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| 11 | * changed to eliminate RPXLite references. |
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| 12 | */ |
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| 13 | |||
| 14 | #include <linux/kernel.h> |
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| 15 | #include <linux/ioport.h> |
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| 16 | #include <linux/module.h> |
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| 17 | #include <linux/init.h> |
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| 18 | #include <linux/stddef.h> |
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| 19 | #include <linux/parport.h> |
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| 20 | #include <linux/i2c.h> |
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| 21 | #include <linux/i2c-algo-8xx.h> |
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| 22 | #include <asm/mpc8xx.h> |
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| 23 | #include <asm/commproc.h> |
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| 24 | |||
| 25 | |||
| 26 | static void |
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| 27 | rpx_iic_init(struct i2c_algo_8xx_data *data) |
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| 28 | { |
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| 29 | volatile cpm8xx_t *cp; |
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| 30 | volatile immap_t *immap; |
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| 31 | |||
| 32 | cp = cpmp; /* Get pointer to Communication Processor */ |
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| 33 | immap = (immap_t *)IMAP_ADDR; /* and to internal registers */ |
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| 34 | |||
| 35 | data->iip = (iic_t *)&cp->cp_dparam[PROFF_IIC]; |
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| 36 | |||
| 37 | /* Check for and use a microcode relocation patch. |
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| 38 | */ |
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| 39 | if ((data->reloc = data->iip->iic_rpbase)) |
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| 40 | data->iip = (iic_t *)&cp->cp_dpmem[data->iip->iic_rpbase]; |
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| 41 | |||
| 42 | data->i2c = (i2c8xx_t *)&(immap->im_i2c); |
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| 43 | data->cp = cp; |
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| 44 | |||
| 45 | /* Initialize Port B IIC pins. |
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| 46 | */ |
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| 47 | cp->cp_pbpar |= 0x00000030; |
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| 48 | cp->cp_pbdir |= 0x00000030; |
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| 49 | cp->cp_pbodr |= 0x00000030; |
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| 50 | |||
| 51 | /* Allocate space for two transmit and two receive buffer |
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| 52 | * descriptors in the DP ram. |
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| 53 | */ |
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| 54 | data->dp_addr = m8xx_cpm_dpalloc(sizeof(cbd_t) * 4); |
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| 55 | |||
| 56 | /* ptr to i2c area */ |
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| 57 | data->i2c = (i2c8xx_t *)&(((immap_t *)IMAP_ADDR)->im_i2c); |
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| 58 | } |
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| 59 | |||
| 60 | static int rpx_install_isr(int irq, void (*func)(void *, void *), void *data) |
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| 61 | { |
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| 62 | /* install interrupt handler */ |
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| 63 | cpm_install_handler(irq, (void (*)(void *, struct pt_regs *)) func, data); |
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| 64 | |||
| 65 | return 0; |
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| 66 | } |
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| 67 | |||
| 68 | static struct i2c_algo_8xx_data rpx_data = { |
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| 69 | .setisr = rpx_install_isr |
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| 70 | }; |
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| 71 | |||
| 72 | static struct i2c_adapter rpx_ops = { |
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| 73 | .owner = THIS_MODULE, |
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| 74 | .name = "m8xx", |
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| 75 | .id = I2C_HW_MPC8XX_EPON, |
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| 76 | .algo_data = &rpx_data, |
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| 77 | }; |
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| 78 | |||
| 79 | int __init i2c_rpx_init(void) |
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| 80 | { |
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| 81 | printk(KERN_INFO "i2c-rpx: i2c MPC8xx driver\n"); |
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| 82 | |||
| 83 | /* reset hardware to sane state */ |
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| 84 | rpx_iic_init(&rpx_data); |
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| 85 | |||
| 86 | if (i2c_8xx_add_bus(&rpx_ops) < 0) { |
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| 87 | printk("i2c-rpx: Unable to register with I2C\n"); |
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| 88 | return -ENODEV; |
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| 89 | } |
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| 90 | |||
| 91 | return 0; |
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| 92 | } |
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| 93 | |||
| 94 | void __exit i2c_rpx_exit(void) |
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| 95 | { |
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| 96 | i2c_8xx_del_bus(&rpx_ops); |
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| 97 | } |
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| 98 | |||
| 99 | MODULE_AUTHOR("Dan Malek <dmalek@jlc.net>"); |
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| 100 | MODULE_DESCRIPTION("I2C-Bus adapter routines for MPC8xx boards"); |
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| 101 | |||
| 102 | module_init(i2c_rpx_init); |
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| 103 | module_exit(i2c_rpx_exit); |