#include <linux/interrupt.h>
#include <linux/delay.h>
+#include <asm/mpc52xx.h>
+#include <sysdev/fsl_soc.h>
+
#define DRV_NAME "mpc-i2c"
#define MPC_I2C_FDR 0x04
wait_queue_head_t queue;
struct i2c_adapter adap;
int irq;
- u32 flags;
+};
+
+struct mpc_i2c_divider {
+ u16 divider;
+ u16 fdr; /* including dfsrr */
+};
+
+struct mpc_i2c_match_data {
+ void (*setclock)(struct device_node *node,
+ struct mpc_i2c *i2c,
+ u32 clock, u32 prescaler);
+ u32 prescaler;
};
static inline void writeccr(struct mpc_i2c *i2c, u32 x)
return 0;
}
-static void mpc_i2c_setclock(struct mpc_i2c *i2c)
+#ifdef CONFIG_PPC_52xx
+static const struct mpc_i2c_divider mpc_i2c_dividers_52xx[] = {
+ {20, 0x20}, {22, 0x21}, {24, 0x22}, {26, 0x23},
+ {28, 0x24}, {30, 0x01}, {32, 0x25}, {34, 0x02},
+ {36, 0x26}, {40, 0x27}, {44, 0x04}, {48, 0x28},
+ {52, 0x63}, {56, 0x29}, {60, 0x41}, {64, 0x2a},
+ {68, 0x07}, {72, 0x2b}, {80, 0x2c}, {88, 0x09},
+ {96, 0x2d}, {104, 0x0a}, {112, 0x2e}, {120, 0x81},
+ {128, 0x2f}, {136, 0x47}, {144, 0x0c}, {160, 0x30},
+ {176, 0x49}, {192, 0x31}, {208, 0x4a}, {224, 0x32},
+ {240, 0x0f}, {256, 0x33}, {272, 0x87}, {288, 0x10},
+ {320, 0x34}, {352, 0x89}, {384, 0x35}, {416, 0x8a},
+ {448, 0x36}, {480, 0x13}, {512, 0x37}, {576, 0x14},
+ {640, 0x38}, {768, 0x39}, {896, 0x3a}, {960, 0x17},
+ {1024, 0x3b}, {1152, 0x18}, {1280, 0x3c}, {1536, 0x3d},
+ {1792, 0x3e}, {1920, 0x1b}, {2048, 0x3f}, {2304, 0x1c},
+ {2560, 0x1d}, {3072, 0x1e}, {3584, 0x7e}, {3840, 0x1f},
+ {4096, 0x7f}, {4608, 0x5c}, {5120, 0x5d}, {6144, 0x5e},
+ {7168, 0xbe}, {7680, 0x5f}, {8192, 0xbf}, {9216, 0x9c},
+ {10240, 0x9d}, {12288, 0x9e}, {15360, 0x9f}
+};
+
+int mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock, int prescaler)
+{
+ const struct mpc52xx_i2c_divider *div = NULL;
+ unsigned int pvr = mfspr(SPRN_PVR);
+ u32 divider;
+ int i;
+
+ if (!clock)
+ return -EINVAL;
+
+ /* Determine divider value */
+ divider = mpc52xx_find_ipb_freq(node) / clock;
+
+ /*
+ * We want to choose an FDR/DFSR that generates an I2C bus speed that
+ * is equal to or lower than the requested speed.
+ */
+ for (i = 0; i < ARRAY_SIZE(mpc52xx_i2c_dividers); i++) {
+ div = &mpc_i2c_dividers_52xx[i];
+ /* Old MPC5200 rev A CPUs do not support the high bits */
+ if (div->fdr & 0xc0 && pvr == 0x80822011)
+ continue;
+ if (div->divider >= divider)
+ break;
+ }
+
+ return div ? (int)div->fdr : -EINVAL;
+}
+
+static void mpc_i2c_setclock_52xx(struct device_node *node,
+ struct mpc_i2c *i2c,
+ u32 clock, u32 prescaler)
+{
+ int fdr = mpc52xx_i2c_get_fdr(node, clock, prescaler);
+
+ if (fdr < 0)
+ fdr = 0x3f; /* backward compatibility */
+ writeb(fdr & 0xff, i2c->base + MPC_I2C_FDR);
+ dev_info(i2c->dev, "clock %d Hz (fdr=%d)\n", clock, fdr);
+}
+#else /* !CONFIG_PPC_52xx */
+static void mpc_i2c_setclock_52xx(struct device_node *node,
+ struct mpc_i2c *i2c,
+ u32 clock, u32 prescaler)
+{
+}
+#endif /* CONFIG_PPC_52xx*/
+
+#ifdef CONFIG_FSL_SOC
+static const struct mpc_i2c_divider mpc_i2c_dividers_8xxx[] = {
+ {160, 0x0120}, {192, 0x0121}, {224, 0x0122}, {256, 0x0123},
+ {288, 0x0100}, {320, 0x0101}, {352, 0x0601}, {384, 0x0102},
+ {416, 0x0602}, {448, 0x0126}, {480, 0x0103}, {512, 0x0127},
+ {544, 0x0b03}, {576, 0x0104}, {608, 0x1603}, {640, 0x0105},
+ {672, 0x2003}, {704, 0x0b05}, {736, 0x2b03}, {768, 0x0106},
+ {800, 0x3603}, {832, 0x0b06}, {896, 0x012a}, {960, 0x0107},
+ {1024, 0x012b}, {1088, 0x1607}, {1152, 0x0108}, {1216, 0x2b07},
+ {1280, 0x0109}, {1408, 0x1609}, {1536, 0x010a}, {1664, 0x160a},
+ {1792, 0x012e}, {1920, 0x010b}, {2048, 0x012f}, {2176, 0x2b0b},
+ {2304, 0x010c}, {2560, 0x010d}, {2816, 0x2b0d}, {3072, 0x010e},
+ {3328, 0x2b0e}, {3584, 0x0132}, {3840, 0x010f}, {4096, 0x0133},
+ {4608, 0x0110}, {5120, 0x0111}, {6144, 0x0112}, {7168, 0x0136},
+ {7680, 0x0113}, {8192, 0x0137}, {9216, 0x0114}, {10240, 0x0115},
+ {12288, 0x0116}, {14336, 0x013a}, {15360, 0x0117}, {16384, 0x013b},
+ {18432, 0x0118}, {20480, 0x0119}, {24576, 0x011a}, {28672, 0x013e},
+ {30720, 0x011b}, {32768, 0x013f}, {36864, 0x011c}, {40960, 0x011d},
+ {49152, 0x011e}, {61440, 0x011f}
+};
+
+u32 mpc_i2c_get_sec_cfg_8xxx(void)
+{
+ struct device_node *node = NULL;
+ u32 __iomem *reg;
+ u32 val = 0;
+
+ node = of_find_node_by_name(NULL, "global-utilities");
+ if (node) {
+ const u32 *prop = of_get_property(node, "reg", NULL);
+ if (prop) {
+ /*
+ * Map and check POR Device Status Register 2
+ * (PORDEVSR2) at 0xE0014
+ */
+ reg = ioremap(get_immrbase() + *prop + 0x14, 0x4);
+ if (!reg)
+ printk(KERN_ERR
+ "Error: couldn't map PORDEVSR2\n");
+ else
+ val = in_be32(reg) & 0x00000080; /* sec-cfg */
+ iounmap(reg);
+ }
+ }
+ if (node)
+ of_node_put(node);
+
+ return val;
+}
+
+int mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock, u32 prescaler)
+{
+ const struct mpc_i2c_divider *div = NULL;
+ u32 divider;
+ int i;
+
+ if (!clock)
+ return -EINVAL;
+
+ /* Determine proper divider value */
+ if (of_device_is_compatible(node, "fsl,mpc8544-i2c"))
+ prescaler = mpc_i2c_get_sec_cfg_8xxx() ? 3 : 2;
+ if (!prescaler)
+ prescaler = 1;
+
+ divider = fsl_get_sys_freq() / clock / prescaler;
+
+ pr_debug("I2C: src_clock=%d clock=%d divider=%d\n",
+ fsl_get_sys_freq(), clock, divider);
+
+ /*
+ * We want to choose an FDR/DFSR that generates an I2C bus speed that
+ * is equal to or lower than the requested speed.
+ */
+ for (i = 0; i < ARRAY_SIZE(mpc_i2c_dividers_8xxx); i++) {
+ div = &mpc_i2c_dividers_8xxx[i];
+ if (div->divider >= divider)
+ break;
+ }
+
+ return div ? (int)div->fdr : -EINVAL;
+}
+
+static void mpc_i2c_setclock_8xxx(struct device_node *node,
+ struct mpc_i2c *i2c,
+ u32 clock, u32 prescaler)
+{
+ int fdr = mpc_i2c_get_fdr_8xxx(node, clock, prescaler);
+
+ if (fdr < 0)
+ fdr = 0x1031; /* backward compatibility */
+ writeb(fdr & 0xff, i2c->base + MPC_I2C_FDR);
+ writeb((fdr >> 8) & 0xff, i2c->base + MPC_I2C_DFSRR);
+ dev_info(i2c->dev, "clock %d Hz (dfsrr=%d fdr=%d)\n",
+ clock, fdr >> 8, fdr & 0xff);
+}
+
+#else /* !CONFIG_FSL_SOC */
+static void mpc_i2c_setclock_8xxx(struct device_node *node,
+ struct mpc_i2c *i2c,
+ u32 clock, u32 prescaler)
{
- /* Set clock and filters */
- if (i2c->flags & FSL_I2C_DEV_SEPARATE_DFSRR) {
- writeb(0x31, i2c->base + MPC_I2C_FDR);
- writeb(0x10, i2c->base + MPC_I2C_DFSRR);
- } else if (i2c->flags & FSL_I2C_DEV_CLOCK_5200)
- writeb(0x3f, i2c->base + MPC_I2C_FDR);
- else
- writel(0x1031, i2c->base + MPC_I2C_FDR);
}
+#endif /* CONFIG_FSL_SOC */
static void mpc_i2c_start(struct mpc_i2c *i2c)
{
static int __devinit fsl_i2c_probe(struct of_device *op,
const struct of_device_id *match)
{
- int result = 0;
struct mpc_i2c *i2c;
+ const u32 *prop;
+ u32 clock = 0;
+ int result = 0;
+ int plen;
i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
if (!i2c)
i2c->dev = &op->dev; /* for debug and error output */
- if (of_get_property(op->node, "dfsrr", NULL))
- i2c->flags |= FSL_I2C_DEV_SEPARATE_DFSRR;
-
- if (of_device_is_compatible(op->node, "fsl,mpc5200-i2c") ||
- of_device_is_compatible(op->node, "mpc5200-i2c"))
- i2c->flags |= FSL_I2C_DEV_CLOCK_5200;
-
init_waitqueue_head(&i2c->queue);
i2c->base = of_iomap(op->node, 0);
}
}
- mpc_i2c_setclock(i2c);
+ if (!of_get_property(op->node, "fsl,preserve-clocking", NULL)) {
+ prop = of_get_property(op->node, "clock-frequency", &plen);
+ if (prop && plen == sizeof(u32))
+ clock = *prop;
+
+ if (match->data) {
+ struct mpc_i2c_match_data *data =
+ (struct mpc_i2c_match_data *)match->data;
+ data->setclock(op->node, i2c, clock, data->prescaler);
+ } else {
+ /* Backwards compatibility */
+ if (of_get_property(op->node, "dfsrr", NULL))
+ mpc_i2c_setclock_8xxx(op->node, i2c,
+ clock, 0);
+ }
+ }
dev_set_drvdata(&op->dev, i2c);
};
static const struct of_device_id mpc_i2c_of_match[] = {
- {.compatible = "fsl-i2c",},
+ {.compatible = "mpc5200-i2c",
+ .data = &(struct mpc_i2c_match_data) {
+ .setclock = mpc_i2c_setclock_52xx,
+ },
+ },
+ {.compatible = "fsl,mpc5200b-i2c",
+ .data = &(struct mpc_i2c_match_data) {
+ .setclock = mpc_i2c_setclock_52xx,
+ },
+ },
+ {.compatible = "fsl,mpc5200-i2c",
+ .data = &(struct mpc_i2c_match_data) {
+ .setclock = mpc_i2c_setclock_52xx,
+ },
+ },
+ {.compatible = "fsl,mpc8313-i2c",
+ .data = &(struct mpc_i2c_match_data) {
+ .setclock = mpc_i2c_setclock_8xxx,
+ },
+ },
+ {.compatible = "fsl,mpc8543-i2c",
+ .data = &(struct mpc_i2c_match_data) {
+ .setclock = mpc_i2c_setclock_8xxx,
+ .prescaler = 2,
+ },
+ },
+ {.compatible = "fsl,mpc8544-i2c",
+ .data = &(struct mpc_i2c_match_data) {
+ .setclock = mpc_i2c_setclock_8xxx,
+ .prescaler = 3,
+ },
+ /* Backward compatibility */
+ },
+ {.compatible = "fsl-i2c", },
{},
};
+
MODULE_DEVICE_TABLE(of, mpc_i2c_of_match);
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