diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-mpc.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-mpc.c | 93 |
1 files changed, 75 insertions, 18 deletions
diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c index 370c342e5e81..78a15af32942 100644 --- a/drivers/i2c/busses/i2c-mpc.c +++ b/drivers/i2c/busses/i2c-mpc.c @@ -31,6 +31,9 @@ #define DRV_NAME "mpc-i2c" +#define MPC_I2C_CLOCK_LEGACY 0 +#define MPC_I2C_CLOCK_PRESERVE (~0U) + #define MPC_I2C_FDR 0x04 #define MPC_I2C_CR 0x08 #define MPC_I2C_SR 0x0c @@ -163,7 +166,7 @@ static int i2c_wait(struct mpc_i2c *i2c, unsigned timeout, int writing) return 0; } -#ifdef CONFIG_PPC_MPC52xx +#if defined(CONFIG_PPC_MPC52xx) || defined(CONFIG_PPC_MPC512x) static const struct mpc_i2c_divider mpc_i2c_dividers_52xx[] __devinitconst = { {20, 0x20}, {22, 0x21}, {24, 0x22}, {26, 0x23}, {28, 0x24}, {30, 0x01}, {32, 0x25}, {34, 0x02}, @@ -193,7 +196,7 @@ static int __devinit mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock, u32 divider; int i; - if (!clock) + if (clock == MPC_I2C_CLOCK_LEGACY) return -EINVAL; /* Determine divider value */ @@ -221,6 +224,12 @@ static void __devinit mpc_i2c_setup_52xx(struct device_node *node, { int ret, fdr; + if (clock == MPC_I2C_CLOCK_PRESERVE) { + dev_dbg(i2c->dev, "using fdr %d\n", + readb(i2c->base + MPC_I2C_FDR)); + return; + } + ret = mpc_i2c_get_fdr_52xx(node, clock, prescaler); fdr = (ret >= 0) ? ret : 0x3f; /* backward compatibility */ @@ -229,13 +238,49 @@ static void __devinit mpc_i2c_setup_52xx(struct device_node *node, if (ret >= 0) dev_info(i2c->dev, "clock %d Hz (fdr=%d)\n", clock, fdr); } -#else /* !CONFIG_PPC_MPC52xx */ +#else /* !(CONFIG_PPC_MPC52xx || CONFIG_PPC_MPC512x) */ static void __devinit mpc_i2c_setup_52xx(struct device_node *node, struct mpc_i2c *i2c, u32 clock, u32 prescaler) { } -#endif /* CONFIG_PPC_MPC52xx*/ +#endif /* CONFIG_PPC_MPC52xx || CONFIG_PPC_MPC512x */ + +#ifdef CONFIG_PPC_MPC512x +static void __devinit mpc_i2c_setup_512x(struct device_node *node, + struct mpc_i2c *i2c, + u32 clock, u32 prescaler) +{ + struct device_node *node_ctrl; + void __iomem *ctrl; + const u32 *pval; + u32 idx; + + /* Enable I2C interrupts for mpc5121 */ + node_ctrl = of_find_compatible_node(NULL, NULL, + "fsl,mpc5121-i2c-ctrl"); + if (node_ctrl) { + ctrl = of_iomap(node_ctrl, 0); + if (ctrl) { + /* Interrupt enable bits for i2c-0/1/2: bit 24/26/28 */ + pval = of_get_property(node, "reg", NULL); + idx = (*pval & 0xff) / 0x20; + setbits32(ctrl, 1 << (24 + idx * 2)); + iounmap(ctrl); + } + of_node_put(node_ctrl); + } + + /* The clock setup for the 52xx works also fine for the 512x */ + mpc_i2c_setup_52xx(node, i2c, clock, prescaler); +} +#else /* CONFIG_PPC_MPC512x */ +static void __devinit mpc_i2c_setup_512x(struct device_node *node, + struct mpc_i2c *i2c, + u32 clock, u32 prescaler) +{ +} +#endif /* CONFIG_PPC_MPC512x */ #ifdef CONFIG_FSL_SOC static const struct mpc_i2c_divider mpc_i2c_dividers_8xxx[] __devinitconst = { @@ -294,7 +339,7 @@ static int __devinit mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock, u32 divider; int i; - if (!clock) + if (clock == MPC_I2C_CLOCK_LEGACY) return -EINVAL; /* Determine proper divider value */ @@ -327,6 +372,13 @@ static void __devinit mpc_i2c_setup_8xxx(struct device_node *node, { int ret, fdr; + if (clock == MPC_I2C_CLOCK_PRESERVE) { + dev_dbg(i2c->dev, "using dfsrr %d, fdr %d\n", + readb(i2c->base + MPC_I2C_DFSRR), + readb(i2c->base + MPC_I2C_FDR)); + return; + } + ret = mpc_i2c_get_fdr_8xxx(node, clock, prescaler); fdr = (ret >= 0) ? ret : 0x1031; /* backward compatibility */ @@ -495,7 +547,7 @@ static int __devinit fsl_i2c_probe(struct of_device *op, { struct mpc_i2c *i2c; const u32 *prop; - u32 clock = 0; + u32 clock = MPC_I2C_CLOCK_LEGACY; int result = 0; int plen; @@ -524,20 +576,21 @@ static int __devinit fsl_i2c_probe(struct of_device *op, } } - if (!of_get_property(op->node, "fsl,preserve-clocking", NULL)) { + if (of_get_property(op->node, "fsl,preserve-clocking", NULL)) { + clock = MPC_I2C_CLOCK_PRESERVE; + } else { prop = of_get_property(op->node, "clock-frequency", &plen); if (prop && plen == sizeof(u32)) clock = *prop; + } - if (match->data) { - struct mpc_i2c_data *data = - (struct mpc_i2c_data *)match->data; - data->setup(op->node, i2c, clock, data->prescaler); - } else { - /* Backwards compatibility */ - if (of_get_property(op->node, "dfsrr", NULL)) - mpc_i2c_setup_8xxx(op->node, i2c, clock, 0); - } + if (match->data) { + struct mpc_i2c_data *data = match->data; + data->setup(op->node, i2c, clock, data->prescaler); + } else { + /* Backwards compatibility */ + if (of_get_property(op->node, "dfsrr", NULL)) + mpc_i2c_setup_8xxx(op->node, i2c, clock, 0); } dev_set_drvdata(&op->dev, i2c); @@ -582,6 +635,10 @@ static int __devexit fsl_i2c_remove(struct of_device *op) return 0; }; +static struct mpc_i2c_data mpc_i2c_data_512x __devinitdata = { + .setup = mpc_i2c_setup_512x, +}; + static struct mpc_i2c_data mpc_i2c_data_52xx __devinitdata = { .setup = mpc_i2c_setup_52xx, }; @@ -604,6 +661,7 @@ static const struct of_device_id mpc_i2c_of_match[] = { {.compatible = "mpc5200-i2c", .data = &mpc_i2c_data_52xx, }, {.compatible = "fsl,mpc5200b-i2c", .data = &mpc_i2c_data_52xx, }, {.compatible = "fsl,mpc5200-i2c", .data = &mpc_i2c_data_52xx, }, + {.compatible = "fsl,mpc5121-i2c", .data = &mpc_i2c_data_512x, }, {.compatible = "fsl,mpc8313-i2c", .data = &mpc_i2c_data_8313, }, {.compatible = "fsl,mpc8543-i2c", .data = &mpc_i2c_data_8543, }, {.compatible = "fsl,mpc8544-i2c", .data = &mpc_i2c_data_8544, }, @@ -613,7 +671,6 @@ static const struct of_device_id mpc_i2c_of_match[] = { }; MODULE_DEVICE_TABLE(of, mpc_i2c_of_match); - /* Structure for a device driver */ static struct of_platform_driver mpc_i2c_driver = { .match_table = mpc_i2c_of_match, @@ -646,5 +703,5 @@ module_exit(fsl_i2c_exit); MODULE_AUTHOR("Adrian Cox <adrian@humboldt.co.uk>"); MODULE_DESCRIPTION("I2C-Bus adapter for MPC107 bridge and " - "MPC824x/85xx/52xx processors"); + "MPC824x/83xx/85xx/86xx/512x/52xx processors"); MODULE_LICENSE("GPL"); |