From 60ccfbbad04a23aa5d464b472df462a55cd2bb74 Mon Sep 17 00:00:00 2001 From: Michael Lee Date: Thu, 7 Jan 2016 21:50:24 +0800 Subject: [PATCH] ramips: update i2c drivers * add rt_i2c structure to store driver data * rewrite read/write check function and add i2c error status check. so we don't need to wait until time out. * add 10 bits address support. according to the data sheet i think it is possible. but i haven't verify it. * the most important is start transfer only need once. otherwise it cause I2C_STARTERR status. * add set i2c clock speed register by dts options "clock-frequency". not just hard code it. * add mt7621 i2c driver. i just copy i2c-ralink.c and change register names. and the hardware don't support error status. so i remove it. but the logic is the same. Signed-off-by: Michael Lee --- ...0044-i2c-MIPS-adds-ralink-I2C-driver.patch | 459 ++++++++------ .../0045-i2c-add-mt7621-driver.patch | 565 +++++++++++------- 2 files changed, 632 insertions(+), 392 deletions(-) diff --git a/target/linux/ramips/patches-4.4/0044-i2c-MIPS-adds-ralink-I2C-driver.patch b/target/linux/ramips/patches-4.4/0044-i2c-MIPS-adds-ralink-I2C-driver.patch index 31854eff4b..21872082dd 100644 --- a/target/linux/ramips/patches-4.4/0044-i2c-MIPS-adds-ralink-I2C-driver.patch +++ b/target/linux/ramips/patches-4.4/0044-i2c-MIPS-adds-ralink-I2C-driver.patch @@ -45,12 +45,13 @@ Signed-off-by: John Crispin +}; --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig -@@ -806,6 +806,10 @@ config I2C_RK3X +@@ -806,6 +806,11 @@ config I2C_RK3X This driver can also be built as a module. If so, the module will be called i2c-rk3x. +config I2C_RALINK + tristate "Ralink I2C Controller" ++ depends on RALINK && !SOC_MT7621 + select OF_I2C + config HAVE_S3C2410_I2C @@ -68,11 +69,12 @@ Signed-off-by: John Crispin obj-$(CONFIG_I2C_RK3X) += i2c-rk3x.o --- /dev/null +++ b/drivers/i2c/busses/i2c-ralink.c -@@ -0,0 +1,327 @@ +@@ -0,0 +1,435 @@ +/* + * drivers/i2c/busses/i2c-ralink.c + * + * Copyright (C) 2013 Steven Liu ++ * Copyright (C) 2016 Michael Lee + * + * Improve driver for i2cdetect from i2c-tools to detect i2c devices on the bus. + * (C) 2014 Sittisak @@ -101,8 +103,7 @@ Signed-off-by: John Crispin +#include +#include +#include -+ -+#include ++#include + +#define REG_CONFIG_REG 0x00 +#define REG_CLKDIV_REG 0x04 @@ -113,191 +114,250 @@ Signed-off-by: John Crispin +#define REG_STATUS_REG 0x18 +#define REG_STARTXFR_REG 0x1C +#define REG_BYTECNT_REG 0x20 -+#define REG_SM0CFG2 0x28 -+#define REG_SM0CTL0 0x40 + ++/* REG_CONFIG_REG */ ++#define I2C_ADDRLEN_OFFSET 5 ++#define I2C_DEVADLEN_OFFSET 2 ++#define I2C_ADDRLEN_MASK 0x3 ++#define I2C_ADDR_DIS BIT(1) ++#define I2C_DEVADDR_DIS BIT(0) ++#define I2C_ADDRLEN_8 (7 << I2C_ADDRLEN_OFFSET) ++#define I2C_DEVADLEN_7 (6 << I2C_DEVADLEN_OFFSET) ++#define I2C_CONF_DEFAULT (I2C_ADDRLEN_8 | I2C_DEVADLEN_7) ++ ++/* REG_CLKDIV_REG */ ++#define I2C_CLKDIV_MASK 0xffff ++ ++/* REG_DEVADDR_REG */ ++#define I2C_DEVADDR_MASK 0x7f ++ ++/* REG_ADDR_REG */ ++#define I2C_ADDR_MASK 0xff ++ ++/* REG_STATUS_REG */ +#define I2C_STARTERR BIT(4) +#define I2C_ACKERR BIT(3) +#define I2C_DATARDY BIT(2) +#define I2C_SDOEMPTY BIT(1) +#define I2C_BUSY BIT(0) + -+#define I2C_DEVADLEN_7 (6 << 2) -+#define I2C_ADDRDIS BIT(1) ++/* REG_STARTXFR_REG */ ++#define NOSTOP_CMD BIT(2) ++#define NODATA_CMD BIT(1) ++#define READ_CMD BIT(0) + -+#define CLKDIV_VALUE 200 // clock rate is 40M, 40M / (200*2) = 100k (standard i2c bus rate). -+//#define CLKDIV_VALUE 50 // clock rate is 40M, 40M / (50*2) = 400k (fast i2c bus rate). -+ -+#define READ_CMD 0x01 -+#define WRITE_CMD 0x00 -+#define READ_BLOCK 64 -+ -+#define SM0CTL0_OD BIT(31) -+#define SM0CTL0_VTRIG BIT(28) -+#define SM0CTL0_OUTHI BIT(6) -+#define SM0CTL0_STRETCH BIT(1) -+#define SM0CTL0_DEFAULT (SM0CTL0_OD | SM0CTL0_VTRIG | SM0CTL0_OUTHI | SM0CTL0_STRETCH) ++/* REG_BYTECNT_REG */ ++#define BYTECNT_MAX 64 ++#define SET_BYTECNT(x) (x - 1) + +/* timeout waiting for I2C devices to respond (clock streching) */ -+#define RT_I2C_TIMEOUT (msecs_to_jiffies(1000)) ++#define TIMEOUT_MS 1000 ++#define DELAY_INTERVAL_US 100 + -+enum { -+ I2C_TYPE_RALINK, -+ I2C_TYPE_MEDIATEK, ++struct rt_i2c { ++ void __iomem *base; ++ struct clk *clk; ++ struct device *dev; ++ struct i2c_adapter adap; ++ u32 cur_clk; ++ u32 clk_div; ++ u32 flags; +}; + -+static void __iomem *membase; -+static struct i2c_adapter *adapter; -+static int hw_type; -+ -+static void rt_i2c_w32(u32 val, unsigned reg) ++static void rt_i2c_w32(struct rt_i2c *i2c, u32 val, unsigned reg) +{ -+ iowrite32(val, membase + reg); ++ iowrite32(val, i2c->base + reg); +} + -+static u32 rt_i2c_r32(unsigned reg) ++static u32 rt_i2c_r32(struct rt_i2c *i2c, unsigned reg) +{ -+ return ioread32(membase + reg); ++ return ioread32(i2c->base + reg); +} + -+static inline int rt_i2c_get_ack(void) ++static int poll_down_timeout(void __iomem *addr, u32 mask) +{ -+ return (rt_i2c_r32(REG_STATUS_REG) & I2C_ACKERR) ? -EIO : 0; -+} -+ -+static inline int rt_i2c_wait_rx_done(void) -+{ -+ unsigned long timeout; -+ -+ timeout = jiffies + RT_I2C_TIMEOUT; ++ unsigned long timeout = jiffies + msecs_to_jiffies(TIMEOUT_MS); + + do { -+ if (time_after(jiffies, timeout)) -+ return (-ETIMEDOUT); ++ if (!(readl_relaxed(addr) & mask)) ++ return 0; + -+ } while (!(rt_i2c_r32(REG_STATUS_REG) & I2C_DATARDY)); ++ usleep_range(DELAY_INTERVAL_US, DELAY_INTERVAL_US + 50); ++ } while (time_before(jiffies, timeout)); + -+ return 0; ++ return (readl_relaxed(addr) & mask) ? -EAGAIN : 0; +} + -+static inline int rt_i2c_wait_idle(void) ++static int rt_i2c_wait_idle(struct rt_i2c *i2c) +{ -+ unsigned long timeout; ++ int ret; + -+ timeout = jiffies + RT_I2C_TIMEOUT; -+ -+ do { -+ if (time_after(jiffies, timeout)) { -+ printk("i2c-read line busy\n"); -+ return 1; -+ } -+ } while (rt_i2c_r32(REG_STATUS_REG) & I2C_BUSY); -+ -+ return 0; -+} -+ -+static inline int rt_i2c_wait_tx_done(void) -+{ -+ unsigned long timeout; -+ -+ timeout = jiffies + RT_I2C_TIMEOUT; -+ -+ do { -+ if (time_after(jiffies, timeout)) -+ return (-ETIMEDOUT); -+ -+ } while (!(rt_i2c_r32(REG_STATUS_REG) & I2C_SDOEMPTY)); -+ -+ return 0; -+} -+ -+static int rt_i2c_handle_msg(struct i2c_adapter *a, struct i2c_msg* msg) -+{ -+ int i = 0, j = 0, pos = 0; -+ int nblock = msg->len / READ_BLOCK; -+ int rem = msg->len % READ_BLOCK; -+ int ret = 0; -+ -+ if (msg->flags & I2C_M_TEN) { -+ printk("10 bits addr not supported\n"); -+ return -EINVAL; -+ } -+ -+ if (msg->flags & I2C_M_RD) { -+ for (i = 0; i < nblock; i++) { -+ if (rt_i2c_wait_idle()) -+ return -ETIMEDOUT; -+ rt_i2c_w32(READ_BLOCK - 1, REG_BYTECNT_REG); -+ rt_i2c_w32(READ_CMD, REG_STARTXFR_REG); -+ for (j = 0; j < READ_BLOCK; j++) { -+ if (rt_i2c_wait_rx_done() < 0) -+ ret = rt_i2c_wait_rx_done(); -+ if (rt_i2c_get_ack() < 0) -+ ret = rt_i2c_get_ack(); -+ msg->buf[pos++] = rt_i2c_r32(REG_DATAIN_REG); -+ } -+ } -+ -+ if (rt_i2c_wait_idle()) -+ return -ETIMEDOUT; -+ if (rem) { -+ rt_i2c_w32(rem - 1, REG_BYTECNT_REG); -+ rt_i2c_w32(READ_CMD, REG_STARTXFR_REG); -+ } -+ for (i = 0; i < rem; i++) { -+ if (rt_i2c_wait_rx_done() < 0) -+ ret = rt_i2c_wait_rx_done(); -+ if (rt_i2c_get_ack() < 0) -+ ret = rt_i2c_get_ack(); -+ -+ msg->buf[pos++] = rt_i2c_r32(REG_DATAIN_REG); -+ } -+ } else { -+ if (rt_i2c_wait_idle()) -+ return -ETIMEDOUT; -+ rt_i2c_w32(msg->len - 1, REG_BYTECNT_REG); -+ for (i = 0; i < msg->len; i++) { -+ rt_i2c_w32(msg->buf[i], REG_DATAOUT_REG); -+ rt_i2c_w32(WRITE_CMD, REG_STARTXFR_REG); -+ -+ if (rt_i2c_wait_tx_done() < 0) -+ ret = rt_i2c_wait_tx_done(); -+ if (rt_i2c_get_ack() < 0) -+ ret = rt_i2c_get_ack(); -+ } -+ } ++ ret = poll_down_timeout(i2c->base + REG_STATUS_REG, I2C_BUSY); ++ if (ret < 0) ++ dev_dbg(i2c->dev, "idle err(%d)\n", ret); + + return ret; +} + -+static int rt_i2c_master_xfer(struct i2c_adapter *a, struct i2c_msg *m, int n) ++static int poll_up_timeout(void __iomem *addr, u32 mask) +{ -+ int i = 0; -+ int ret = 0; ++ unsigned long timeout = jiffies + msecs_to_jiffies(TIMEOUT_MS); ++ u32 status; + -+ if (rt_i2c_wait_idle()) -+ return -ETIMEDOUT; ++ do { ++ status = readl_relaxed(addr); + -+ device_reset(a->dev.parent); ++ /* check error status */ ++ if (status & I2C_STARTERR) ++ return -EAGAIN; ++ else if (status & I2C_ACKERR) ++ return -ENXIO; ++ else if (status & mask) ++ return 0; + -+ rt_i2c_w32(m->addr, REG_DEVADDR_REG); -+ rt_i2c_w32(I2C_DEVADLEN_7 | I2C_ADDRDIS, REG_CONFIG_REG); -+ if (hw_type == I2C_TYPE_RALINK) { -+ rt_i2c_w32(CLKDIV_VALUE, REG_CLKDIV_REG); -+ } else { -+ rt_i2c_w32((CLKDIV_VALUE << 16) | SM0CTL0_DEFAULT, REG_SM0CTL0); -+ rt_i2c_w32(1, REG_SM0CFG2); -+ } ++ usleep_range(DELAY_INTERVAL_US, DELAY_INTERVAL_US + 50); ++ } while (time_before(jiffies, timeout)); + -+ for (i = 0; i < n && !ret; i++) { -+ ret = rt_i2c_handle_msg(a, &m[i]); ++ return -ETIMEDOUT; ++} + -+ if (ret < 0) { -+ return ret; ++static int rt_i2c_wait_rx_done(struct rt_i2c *i2c) ++{ ++ int ret; ++ ++ ret = poll_up_timeout(i2c->base + REG_STATUS_REG, I2C_DATARDY); ++ if (ret < 0) ++ dev_dbg(i2c->dev, "rx err(%d)\n", ret); ++ ++ return ret; ++} ++ ++static int rt_i2c_wait_tx_done(struct rt_i2c *i2c) ++{ ++ int ret; ++ ++ ret = poll_up_timeout(i2c->base + REG_STATUS_REG, I2C_SDOEMPTY); ++ if (ret < 0) ++ dev_dbg(i2c->dev, "tx err(%d)\n", ret); ++ ++ return ret; ++} ++ ++static void rt_i2c_reset(struct rt_i2c *i2c) ++{ ++ device_reset(i2c->adap.dev.parent); ++ barrier(); ++ rt_i2c_w32(i2c, i2c->clk_div, REG_CLKDIV_REG); ++} ++ ++static void rt_i2c_dump_reg(struct rt_i2c *i2c) ++{ ++ dev_dbg(i2c->dev, "conf %08x, clkdiv %08x, devaddr %08x, " \ ++ "addr %08x, dataout %08x, datain %08x, " \ ++ "status %08x, startxfr %08x, bytecnt %08x\n", ++ rt_i2c_r32(i2c, REG_CONFIG_REG), ++ rt_i2c_r32(i2c, REG_CLKDIV_REG), ++ rt_i2c_r32(i2c, REG_DEVADDR_REG), ++ rt_i2c_r32(i2c, REG_ADDR_REG), ++ rt_i2c_r32(i2c, REG_DATAOUT_REG), ++ rt_i2c_r32(i2c, REG_DATAIN_REG), ++ rt_i2c_r32(i2c, REG_STATUS_REG), ++ rt_i2c_r32(i2c, REG_STARTXFR_REG), ++ rt_i2c_r32(i2c, REG_BYTECNT_REG)); ++} ++ ++static int rt_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, ++ int num) ++{ ++ struct rt_i2c *i2c; ++ struct i2c_msg *pmsg; ++ unsigned char addr; ++ int i, j, ret; ++ u32 cmd; ++ ++ i2c = i2c_get_adapdata(adap); ++ ++ for (i = 0; i < num; i++) { ++ pmsg = &msgs[i]; ++ if (i == (num - 1)) ++ cmd = 0; ++ else ++ cmd = NOSTOP_CMD; ++ ++ dev_dbg(i2c->dev, "addr: 0x%x, len: %d, flags: 0x%x, stop: %d\n", ++ pmsg->addr, pmsg->len, pmsg->flags, ++ (cmd == 0)? 1 : 0); ++ ++ /* wait hardware idle */ ++ if ((ret = rt_i2c_wait_idle(i2c))) ++ goto err_timeout; ++ ++ if (pmsg->flags & I2C_M_TEN) { ++ rt_i2c_w32(i2c, I2C_CONF_DEFAULT, REG_CONFIG_REG); ++ /* 10 bits address */ ++ addr = 0x78 | ((pmsg->addr >> 8) & 0x03); ++ rt_i2c_w32(i2c, addr & I2C_DEVADDR_MASK, ++ REG_DEVADDR_REG); ++ rt_i2c_w32(i2c, pmsg->addr & I2C_ADDR_MASK, ++ REG_ADDR_REG); ++ } else { ++ rt_i2c_w32(i2c, I2C_CONF_DEFAULT | I2C_ADDR_DIS, ++ REG_CONFIG_REG); ++ /* 7 bits address */ ++ rt_i2c_w32(i2c, pmsg->addr & I2C_DEVADDR_MASK, ++ REG_DEVADDR_REG); ++ } ++ ++ /* buffer length */ ++ if (pmsg->len == 0) ++ cmd |= NODATA_CMD; ++ else ++ rt_i2c_w32(i2c, SET_BYTECNT(pmsg->len), ++ REG_BYTECNT_REG); ++ ++ j = 0; ++ if (pmsg->flags & I2C_M_RD) { ++ cmd |= READ_CMD; ++ /* start transfer */ ++ barrier(); ++ rt_i2c_w32(i2c, cmd, REG_STARTXFR_REG); ++ do { ++ /* wait */ ++ if ((ret = rt_i2c_wait_rx_done(i2c))) ++ goto err_timeout; ++ /* read data */ ++ if (pmsg->len) ++ pmsg->buf[j] = rt_i2c_r32(i2c, ++ REG_DATAIN_REG); ++ j++; ++ } while (j < pmsg->len); ++ } else { ++ do { ++ /* write data */ ++ if (pmsg->len) ++ rt_i2c_w32(i2c, pmsg->buf[j], ++ REG_DATAOUT_REG); ++ /* start transfer */ ++ if (j == 0) { ++ barrier(); ++ rt_i2c_w32(i2c, cmd, REG_STARTXFR_REG); ++ } ++ /* wait */ ++ if ((ret = rt_i2c_wait_tx_done(i2c))) ++ goto err_timeout; ++ j++; ++ } while (j < pmsg->len); + } + } ++ /* the return value is number of executed messages */ ++ ret = i; + -+ return n; ++ return ret; ++ ++err_timeout: ++ rt_i2c_dump_reg(i2c); ++ rt_i2c_reset(i2c); ++ return ret; +} + +static u32 rt_i2c_func(struct i2c_adapter *a) @@ -311,60 +371,110 @@ Signed-off-by: John Crispin +}; + +static const struct of_device_id i2c_rt_dt_ids[] = { -+ { .compatible = "ralink,rt2880-i2c", .data = (void *) I2C_TYPE_RALINK }, -+ { .compatible = "mediatek,mt7628-i2c", .data = (void *) I2C_TYPE_MEDIATEK }, ++ { .compatible = "ralink,rt2880-i2c" }, + { /* sentinel */ } +}; + +MODULE_DEVICE_TABLE(of, i2c_rt_dt_ids); + ++static struct i2c_adapter_quirks rt_i2c_quirks = { ++ .max_write_len = BYTECNT_MAX, ++ .max_read_len = BYTECNT_MAX, ++}; ++ ++static int rt_i2c_init(struct rt_i2c *i2c) ++{ ++ u32 reg; ++ ++ /* i2c_sclk = periph_clk / ((2 * clk_div) + 5) */ ++ i2c->clk_div = (clk_get_rate(i2c->clk) - (5 * i2c->cur_clk)) / ++ (2 * i2c->cur_clk); ++ if (i2c->clk_div < 8) ++ i2c->clk_div = 8; ++ if (i2c->clk_div > I2C_CLKDIV_MASK) ++ i2c->clk_div = I2C_CLKDIV_MASK; ++ ++ /* check support combinde/repeated start message */ ++ rt_i2c_w32(i2c, NOSTOP_CMD, REG_STARTXFR_REG); ++ reg = rt_i2c_r32(i2c, REG_STARTXFR_REG) & NOSTOP_CMD; ++ ++ rt_i2c_reset(i2c); ++ ++ return reg; ++} ++ +static int rt_i2c_probe(struct platform_device *pdev) +{ -+ struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); ++ struct resource *res; ++ struct rt_i2c *i2c; ++ struct i2c_adapter *adap; + const struct of_device_id *match; -+ int ret; ++ int ret, restart; + + match = of_match_device(i2c_rt_dt_ids, &pdev->dev); -+ hw_type = (int) match->data; + ++ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + dev_err(&pdev->dev, "no memory resource found\n"); + return -ENODEV; + } + -+ adapter = devm_kzalloc(&pdev->dev, sizeof(struct i2c_adapter), GFP_KERNEL); -+ if (!adapter) { ++ i2c = devm_kzalloc(&pdev->dev, sizeof(struct rt_i2c), GFP_KERNEL); ++ if (!i2c) { + dev_err(&pdev->dev, "failed to allocate i2c_adapter\n"); + return -ENOMEM; + } + -+ membase = devm_ioremap_resource(&pdev->dev, res); -+ if (IS_ERR(membase)) -+ return PTR_ERR(membase); ++ i2c->base = devm_ioremap_resource(&pdev->dev, res); ++ if (IS_ERR(i2c->base)) ++ return PTR_ERR(i2c->base); + -+ strlcpy(adapter->name, dev_name(&pdev->dev), sizeof(adapter->name)); -+ adapter->owner = THIS_MODULE; -+ adapter->nr = pdev->id; -+ adapter->timeout = HZ; -+ adapter->algo = &rt_i2c_algo; -+ adapter->class = I2C_CLASS_HWMON | I2C_CLASS_SPD; -+ adapter->dev.parent = &pdev->dev; -+ adapter->dev.of_node = pdev->dev.of_node; ++ i2c->clk = devm_clk_get(&pdev->dev, NULL); ++ if (IS_ERR(i2c->clk)) { ++ dev_err(&pdev->dev, "no clock defined\n"); ++ return -ENODEV; ++ } ++ clk_prepare_enable(i2c->clk); ++ i2c->dev = &pdev->dev; + -+ ret = i2c_add_numbered_adapter(adapter); -+ if (ret) ++ if (of_property_read_u32(pdev->dev.of_node, ++ "clock-frequency", &i2c->cur_clk)) ++ i2c->cur_clk = 100000; ++ ++ adap = &i2c->adap; ++ adap->owner = THIS_MODULE; ++ adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD; ++ adap->algo = &rt_i2c_algo; ++ adap->retries = 3; ++ adap->dev.parent = &pdev->dev; ++ i2c_set_adapdata(adap, i2c); ++ adap->dev.of_node = pdev->dev.of_node; ++ strlcpy(adap->name, dev_name(&pdev->dev), sizeof(adap->name)); ++ adap->quirks = &rt_i2c_quirks; ++ ++ platform_set_drvdata(pdev, i2c); ++ ++ restart = rt_i2c_init(i2c); ++ ++ ret = i2c_add_adapter(adap); ++ if (ret < 0) { ++ dev_err(&pdev->dev, "failed to add adapter\n"); ++ clk_disable_unprepare(i2c->clk); + return ret; ++ } + -+ platform_set_drvdata(pdev, adapter); ++ dev_info(&pdev->dev, "clock %uKHz, re-start %ssupport\n", ++ i2c->cur_clk/1000, restart ? "" : "not "); + -+ dev_info(&pdev->dev, "loaded\n"); -+ -+ return 0; ++ return ret; +} + +static int rt_i2c_remove(struct platform_device *pdev) +{ -+ platform_set_drvdata(pdev, NULL); ++ struct rt_i2c *i2c = platform_get_drvdata(pdev); ++ ++ i2c_del_adapter(&i2c->adap); ++ clk_disable_unprepare(i2c->clk); + + return 0; +} @@ -389,8 +499,7 @@ Signed-off-by: John Crispin +{ + platform_driver_unregister(&rt_i2c_driver); +} -+ -+module_exit (i2c_rt_exit); ++module_exit(i2c_rt_exit); + +MODULE_AUTHOR("Steven Liu "); +MODULE_DESCRIPTION("Ralink I2c host driver"); diff --git a/target/linux/ramips/patches-4.4/0045-i2c-add-mt7621-driver.patch b/target/linux/ramips/patches-4.4/0045-i2c-add-mt7621-driver.patch index 044991594b..df8b3a4431 100644 --- a/target/linux/ramips/patches-4.4/0045-i2c-add-mt7621-driver.patch +++ b/target/linux/ramips/patches-4.4/0045-i2c-add-mt7621-driver.patch @@ -13,12 +13,13 @@ Signed-off-by: John Crispin --- a/drivers/i2c/busses/Kconfig +++ b/drivers/i2c/busses/Kconfig -@@ -810,6 +810,10 @@ config I2C_RALINK - tristate "Ralink I2C Controller" +@@ -811,6 +811,11 @@ config I2C_RALINK + depends on RALINK && !SOC_MT7621 select OF_I2C +config I2C_MT7621 -+ tristate "MT7621 I2C Controller" ++ tristate "MT7621/MT7628 I2C Controller" ++ depends on RALINK && (SOC_MT7620 || SOC_MT7621) + select OF_I2C + config HAVE_S3C2410_I2C @@ -36,11 +37,12 @@ Signed-off-by: John Crispin obj-$(CONFIG_I2C_RK3X) += i2c-rk3x.o --- /dev/null +++ b/drivers/i2c/busses/i2c-mt7621.c -@@ -0,0 +1,303 @@ +@@ -0,0 +1,433 @@ +/* + * drivers/i2c/busses/i2c-mt7621.c + * + * Copyright (C) 2013 Steven Liu ++ * Copyright (C) 2016 Michael Lee + * + * Improve driver for i2cdetect from i2c-tools to detect i2c devices on the bus. + * (C) 2014 Sittisak @@ -65,276 +67,405 @@ Signed-off-by: John Crispin +#include +#include +#include ++#include +#include +#include +#include ++#include + -+#include ++#define REG_SM0CFG0 0x08 ++#define REG_SM0DOUT 0x10 ++#define REG_SM0DIN 0x14 ++#define REG_SM0ST 0x18 ++#define REG_SM0AUTO 0x1C ++#define REG_SM0CFG1 0x20 ++#define REG_SM0CFG2 0x28 ++#define REG_SM0CTL0 0x40 ++#define REG_SM0CTL1 0x44 ++#define REG_SM0D0 0x50 ++#define REG_SM0D1 0x54 ++#define REG_PINTEN 0x5C ++#define REG_PINTST 0x60 ++#define REG_PINTCL 0x64 + -+#define REG_CONFIG_REG 0x00 -+#define REG_CLKDIV_REG 0x04 -+#define REG_DEVADDR_REG 0x08 -+#define REG_ADDR_REG 0x0C -+#define REG_DATAOUT_REG 0x10 -+#define REG_DATAIN_REG 0x14 -+#define REG_STATUS_REG 0x18 -+#define REG_STARTXFR_REG 0x1C -+#define REG_BYTECNT_REG 0x20 -+#define REG_SM0_IS_AUTOMODE 0x28 -+#define REG_SM0CTL0 0x40 ++/* REG_SM0CFG0 */ ++#define I2C_DEVADDR_MASK 0x7f + ++/* REG_SM0ST */ ++#define I2C_DATARDY BIT(2) ++#define I2C_SDOEMPTY BIT(1) ++#define I2C_BUSY BIT(0) + -+#define I2C_STARTERR 0x10 -+#define I2C_ACKERR 0x08 -+#define I2C_DATARDY 0x04 -+#define I2C_SDOEMPTY 0x02 -+#define I2C_BUSY 0x01 ++/* REG_SM0AUTO */ ++#define READ_CMD BIT(0) + -+/* I2C_CFG register bit field */ -+#define I2C_CFG_ADDRLEN_8 (7<<5) /* 8 bits */ -+#define I2C_CFG_DEVADLEN_7 (6<<2) -+#define I2C_CFG_ADDRDIS BIT(1) -+#define I2C_CFG_DEVADDIS BIT(0) ++/* REG_SM0CFG1 */ ++#define BYTECNT_MAX 64 ++#define SET_BYTECNT(x) (x - 1) + -+#define I2C_CFG_DEFAULT (I2C_CFG_ADDRLEN_8 | \ -+ I2C_CFG_DEVADLEN_7 | \ -+ I2C_CFG_ADDRDIS) ++/* REG_SM0CFG2 */ ++#define AUTOMODE_EN BIT(0) + -+#define I2C_RETRY 0x1000 ++/* REG_SM0CTL0 */ ++#define ODRAIN_HIGH_SM0 BIT(31) ++#define VSYNC_SHIFT 28 ++#define VSYNC_MASK 0x3 ++#define VSYNC_PULSE (0x1 << VSYNC_SHIFT) ++#define VSYNC_RISING (0x2 << VSYNC_SHIFT) ++#define CLK_DIV_SHIFT 16 ++#define CLK_DIV_MASK 0xfff ++#define DEG_CNT_SHIFT 8 ++#define DEG_CNT_MASK 0xff ++#define WAIT_HIGH BIT(6) ++#define DEG_EN BIT(5) ++#define CS_STATUA BIT(4) ++#define SCL_STATUS BIT(3) ++#define SDA_STATUS BIT(2) ++#define SM0_EN BIT(1) ++#define SCL_STRECH BIT(0) + -+#define CLKDIV_VALUE 333 -+#define i2c_busy_loop (CLKDIV_VALUE*30) ++/* REG_SM0CTL1 */ ++#define ACK_SHIFT 16 ++#define ACK_MASK 0xff ++#define PGLEN_SHIFT 8 ++#define PGLEN_MASK 0x7 ++#define SM0_MODE_SHIFT 4 ++#define SM0_MODE_MASK 0x7 ++#define SM0_MODE_START 0x1 ++#define SM0_MODE_WRITE 0x2 ++#define SM0_MODE_STOP 0x3 ++#define SM0_MODE_READ_NACK 0x4 ++#define SM0_MODE_READ_ACK 0x5 ++#define SM0_TRI_BUSY BIT(0) + -+#define READ_CMD 0x01 -+#define WRITE_CMD 0x00 -+#define READ_BLOCK 16 ++/* timeout waiting for I2C devices to respond (clock streching) */ ++#define TIMEOUT_MS 1000 ++#define DELAY_INTERVAL_US 100 + -+#define SM0_ODRAIN BIT(31) -+#define SM0_VSYNC_MODE BIT(28) -+#define SM0_CLK_DIV (CLKDIV_VALUE << 16) -+#define SM0_WAIT_LEVEL BIT(6) -+#define SM0_EN BIT(1) ++struct mtk_i2c { ++ void __iomem *base; ++ struct clk *clk; ++ struct device *dev; ++ struct i2c_adapter adap; ++ u32 cur_clk; ++ u32 clk_div; ++ u32 flags; ++}; + -+#define SM0_CFG_DEFUALT (SM0_ODRAIN | SM0_VSYNC_MODE | \ -+ SM0_CLK_DIV | SM0_WAIT_LEVEL | \ -+ SM0_EN) -+/***********************************************************/ -+ -+static void __iomem *membase; -+static struct i2c_adapter *adapter; -+ -+static void rt_i2c_w32(u32 val, unsigned reg) ++static void mtk_i2c_w32(struct mtk_i2c *i2c, u32 val, unsigned reg) +{ -+ iowrite32(val, membase + reg); ++ iowrite32(val, i2c->base + reg); +} + -+static u32 rt_i2c_r32(unsigned reg) ++static u32 mtk_i2c_r32(struct mtk_i2c *i2c, unsigned reg) +{ -+ return ioread32(membase + reg); ++ return ioread32(i2c->base + reg); +} + -+static void mt7621_i2c_reset(struct i2c_adapter *a) ++static int poll_down_timeout(void __iomem *addr, u32 mask) +{ -+ device_reset(a->dev.parent); -+} -+static void mt7621_i2c_enable(struct i2c_msg *msg) -+{ -+ rt_i2c_w32(msg->addr,REG_DEVADDR_REG); -+ rt_i2c_w32(0,REG_ADDR_REG); ++ unsigned long timeout = jiffies + msecs_to_jiffies(TIMEOUT_MS); ++ ++ do { ++ if (!(readl_relaxed(addr) & mask)) ++ return 0; ++ ++ usleep_range(DELAY_INTERVAL_US, DELAY_INTERVAL_US + 50); ++ } while (time_before(jiffies, timeout)); ++ ++ return (readl_relaxed(addr) & mask) ? -EAGAIN : 0; +} + -+static void i2c_master_init(struct i2c_adapter *a) ++static int mtk_i2c_wait_idle(struct mtk_i2c *i2c) +{ -+ mt7621_i2c_reset(a); -+ rt_i2c_w32(I2C_CFG_DEFAULT,REG_CONFIG_REG); -+ rt_i2c_w32(SM0_CFG_DEFUALT,REG_SM0CTL0); -+ rt_i2c_w32(1,REG_SM0_IS_AUTOMODE);//auto mode ++ int ret; ++ ++ ret = poll_down_timeout(i2c->base + REG_SM0ST, I2C_BUSY); ++ if (ret < 0) ++ dev_dbg(i2c->dev, "idle err(%d)\n", ret); ++ ++ return ret; +} + -+ -+static inline int rt_i2c_wait_rx_done(void) ++static int poll_up_timeout(void __iomem *addr, u32 mask) +{ -+ int i=0; -+ while((!(rt_i2c_r32(REG_STATUS_REG) & I2C_DATARDY)) && (i=i2c_busy_loop){ -+ pr_err("err,wait for idle timeout"); -+ return -ETIMEDOUT; -+ } -+ return 0; -+} ++ unsigned long timeout = jiffies + msecs_to_jiffies(TIMEOUT_MS); ++ u32 status; + -+static inline int rt_i2c_wait_idle(void) -+{ -+ int i=0; -+ while((rt_i2c_r32(REG_STATUS_REG) & I2C_BUSY) && (i=i2c_busy_loop){ -+ pr_err("err,wait for idle timeout"); -+ return -ETIMEDOUT; -+ } -+ return 0; -+} ++ do { ++ status = readl_relaxed(addr); ++ if (status & mask) ++ return 0; ++ usleep_range(DELAY_INTERVAL_US, DELAY_INTERVAL_US + 50); ++ } while (time_before(jiffies, timeout)); + -+static inline int rt_i2c_wait_tx_done(void) -+{ -+ int i=0; -+ while((!(rt_i2c_r32(REG_STATUS_REG) & I2C_SDOEMPTY)) && (i=i2c_busy_loop){ -+ pr_err("err,wait for idle timeout"); -+ return -ETIMEDOUT; -+ } -+ return 0; -+} -+ -+static int rt_i2c_handle_msg(struct i2c_adapter *a, struct i2c_msg* msg) -+{ -+ int i = 0, j = 0, pos = 0; -+ int nblock = msg->len / READ_BLOCK; -+ int rem = msg->len % READ_BLOCK; -+ -+ if (msg->flags & I2C_M_TEN) { -+ printk("10 bits addr not supported\n"); -+ return -EINVAL; -+ } -+ -+ if (msg->flags & I2C_M_RD) { -+ for (i = 0; i < nblock; i++) { -+ if (rt_i2c_wait_idle()) -+ goto err_timeout; -+ rt_i2c_w32(READ_BLOCK - 1, REG_BYTECNT_REG); -+ rt_i2c_w32(READ_CMD, REG_STARTXFR_REG); -+ for (j = 0; j < READ_BLOCK; j++) { -+ if (rt_i2c_wait_rx_done()) -+ goto err_timeout; -+ msg->buf[pos++] = rt_i2c_r32(REG_DATAIN_REG); -+ } -+ } -+ -+ if (rt_i2c_wait_idle()) -+ goto err_timeout; -+ rt_i2c_w32(rem - 1, REG_BYTECNT_REG); -+ rt_i2c_w32(READ_CMD, REG_STARTXFR_REG); -+ -+ for (i = 0; i < rem; i++) { -+ if (rt_i2c_wait_rx_done()) -+ goto err_timeout; -+ msg->buf[pos++] = rt_i2c_r32(REG_DATAIN_REG); -+ } -+ } else { -+ if (rt_i2c_wait_idle()) -+ goto err_timeout; -+ rt_i2c_w32(msg->len - 1, REG_BYTECNT_REG); -+ for (i = 0; i < msg->len; i++) { -+ rt_i2c_w32(msg->buf[i], REG_DATAOUT_REG); -+ if(i == 0) -+ rt_i2c_w32(WRITE_CMD, REG_STARTXFR_REG); -+ -+ if (rt_i2c_wait_tx_done()) -+ goto err_timeout; -+ } -+ } -+ -+ return 0; -+err_timeout: + return -ETIMEDOUT; +} + -+static int rt_i2c_master_xfer(struct i2c_adapter *a, struct i2c_msg *m, int n) ++static int mtk_i2c_wait_rx_done(struct mtk_i2c *i2c) +{ -+ int i = 0; -+ int ret = 0; -+ i2c_master_init(a); -+ mt7621_i2c_enable(m); ++ int ret; + -+ for (i = 0; i != n && ret==0; i++) { -+ ret = rt_i2c_handle_msg(a, &m[i]); -+ if (ret) -+ return ret; -+ } -+ return i; ++ ret = poll_up_timeout(i2c->base + REG_SM0ST, I2C_DATARDY); ++ if (ret < 0) ++ dev_dbg(i2c->dev, "rx err(%d)\n", ret); ++ ++ return ret; +} + -+static u32 rt_i2c_func(struct i2c_adapter *a) ++static int mtk_i2c_wait_tx_done(struct mtk_i2c *i2c) ++{ ++ int ret; ++ ++ ret = poll_up_timeout(i2c->base + REG_SM0ST, I2C_SDOEMPTY); ++ if (ret < 0) ++ dev_dbg(i2c->dev, "tx err(%d)\n", ret); ++ ++ return ret; ++} ++ ++static void mtk_i2c_reset(struct mtk_i2c *i2c) ++{ ++ u32 reg; ++ device_reset(i2c->adap.dev.parent); ++ barrier(); ++ ++ /* ctrl0 */ ++ reg = ODRAIN_HIGH_SM0 | VSYNC_PULSE | (i2c->clk_div << CLK_DIV_SHIFT) | ++ WAIT_HIGH | SM0_EN; ++ mtk_i2c_w32(i2c, reg, REG_SM0CTL0); ++ ++ /* auto mode */ ++ mtk_i2c_w32(i2c, AUTOMODE_EN, REG_SM0CFG2); ++} ++ ++static void mtk_i2c_dump_reg(struct mtk_i2c *i2c) ++{ ++ dev_dbg(i2c->dev, "cfg0 %08x, dout %08x, din %08x, " \ ++ "status %08x, auto %08x, cfg1 %08x, " \ ++ "cfg2 %08x, ctl0 %08x, ctl1 %08x\n", ++ mtk_i2c_r32(i2c, REG_SM0CFG0), ++ mtk_i2c_r32(i2c, REG_SM0DOUT), ++ mtk_i2c_r32(i2c, REG_SM0DIN), ++ mtk_i2c_r32(i2c, REG_SM0ST), ++ mtk_i2c_r32(i2c, REG_SM0AUTO), ++ mtk_i2c_r32(i2c, REG_SM0CFG1), ++ mtk_i2c_r32(i2c, REG_SM0CFG2), ++ mtk_i2c_r32(i2c, REG_SM0CTL0), ++ mtk_i2c_r32(i2c, REG_SM0CTL1)); ++} ++ ++static int mtk_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, ++ int num) ++{ ++ struct mtk_i2c *i2c; ++ struct i2c_msg *pmsg; ++ int i, j, ret; ++ u32 cmd; ++ ++ i2c = i2c_get_adapdata(adap); ++ ++ for (i = 0; i < num; i++) { ++ pmsg = &msgs[i]; ++ cmd = 0; ++ ++ dev_dbg(i2c->dev, "addr: 0x%x, len: %d, flags: 0x%x\n", ++ pmsg->addr, pmsg->len, pmsg->flags); ++ ++ /* wait hardware idle */ ++ if ((ret = mtk_i2c_wait_idle(i2c))) ++ goto err_timeout; ++ ++ if (pmsg->flags & I2C_M_TEN) { ++ dev_dbg(i2c->dev, "10 bits addr not supported\n"); ++ return -EINVAL; ++ } else { ++ /* 7 bits address */ ++ mtk_i2c_w32(i2c, pmsg->addr & I2C_DEVADDR_MASK, ++ REG_SM0CFG0); ++ } ++ ++ /* buffer length */ ++ if (pmsg->len == 0) { ++ dev_dbg(i2c->dev, "length is 0\n"); ++ return -EINVAL; ++ } else ++ mtk_i2c_w32(i2c, SET_BYTECNT(pmsg->len), ++ REG_SM0CFG1); ++ ++ j = 0; ++ if (pmsg->flags & I2C_M_RD) { ++ cmd |= READ_CMD; ++ /* start transfer */ ++ barrier(); ++ mtk_i2c_w32(i2c, cmd, REG_SM0AUTO); ++ do { ++ /* wait */ ++ if ((ret = mtk_i2c_wait_rx_done(i2c))) ++ goto err_timeout; ++ /* read data */ ++ if (pmsg->len) ++ pmsg->buf[j] = mtk_i2c_r32(i2c, ++ REG_SM0DIN); ++ j++; ++ } while (j < pmsg->len); ++ } else { ++ do { ++ /* write data */ ++ if (pmsg->len) ++ mtk_i2c_w32(i2c, pmsg->buf[j], ++ REG_SM0DOUT); ++ /* start transfer */ ++ if (j == 0) { ++ barrier(); ++ mtk_i2c_w32(i2c, cmd, REG_SM0AUTO); ++ } ++ /* wait */ ++ if ((ret = mtk_i2c_wait_tx_done(i2c))) ++ goto err_timeout; ++ j++; ++ } while (j < pmsg->len); ++ } ++ } ++ /* the return value is number of executed messages */ ++ ret = i; ++ ++ return ret; ++ ++err_timeout: ++ mtk_i2c_dump_reg(i2c); ++ mtk_i2c_reset(i2c); ++ return ret; ++} ++ ++static u32 mtk_i2c_func(struct i2c_adapter *a) +{ + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; +} + -+static const struct i2c_algorithm rt_i2c_algo = { -+ .master_xfer = rt_i2c_master_xfer, -+ .functionality = rt_i2c_func, ++static const struct i2c_algorithm mtk_i2c_algo = { ++ .master_xfer = mtk_i2c_master_xfer, ++ .functionality = mtk_i2c_func, +}; + -+static int rt_i2c_probe(struct platform_device *pdev) -+{ -+ struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); -+ int ret; -+ -+ adapter = devm_kzalloc(&pdev->dev,sizeof(struct i2c_adapter), GFP_KERNEL); -+ if (!adapter) { -+ dev_err(&pdev->dev, "failed to allocate i2c_adapter\n"); -+ return -ENOMEM; -+ } -+ membase = devm_ioremap_resource(&pdev->dev, res); -+ if (IS_ERR(membase)) -+ return PTR_ERR(membase); -+ -+ strlcpy(adapter->name, dev_name(&pdev->dev), sizeof(adapter->name)); -+ -+ adapter->owner = THIS_MODULE; -+ adapter->nr = pdev->id; -+ adapter->timeout = HZ; -+ adapter->algo = &rt_i2c_algo; -+ adapter->class = I2C_CLASS_HWMON | I2C_CLASS_SPD; -+ adapter->dev.parent = &pdev->dev; -+ adapter->dev.of_node = pdev->dev.of_node; -+ -+ platform_set_drvdata(pdev, adapter); -+ -+ ret = i2c_add_numbered_adapter(adapter); -+ if (ret) -+ return ret; -+ -+ dev_info(&pdev->dev,"loaded"); -+ -+ return 0; -+} -+ -+static int rt_i2c_remove(struct platform_device *pdev) -+{ -+ platform_set_drvdata(pdev, NULL); -+ return 0; -+} -+ -+static const struct of_device_id i2c_rt_dt_ids[] = { -+ { .compatible = "ralink,i2c-mt7621", }, ++static const struct of_device_id i2c_mtk_dt_ids[] = { ++ { .compatible = "mediatek,mt7621-i2c" }, + { /* sentinel */ } +}; + -+MODULE_DEVICE_TABLE(of, i2c_rt_dt_ids); ++MODULE_DEVICE_TABLE(of, i2c_mtk_dt_ids); + -+static struct platform_driver rt_i2c_driver = { -+ .probe = rt_i2c_probe, -+ .remove = rt_i2c_remove, ++static struct i2c_adapter_quirks mtk_i2c_quirks = { ++ .max_write_len = BYTECNT_MAX, ++ .max_read_len = BYTECNT_MAX, ++}; ++ ++static void mtk_i2c_init(struct mtk_i2c *i2c) ++{ ++ i2c->clk_div = clk_get_rate(i2c->clk) / i2c->cur_clk; ++ if (i2c->clk_div > CLK_DIV_MASK) ++ i2c->clk_div = CLK_DIV_MASK; ++ ++ mtk_i2c_reset(i2c); ++} ++ ++static int mtk_i2c_probe(struct platform_device *pdev) ++{ ++ struct resource *res; ++ struct mtk_i2c *i2c; ++ struct i2c_adapter *adap; ++ const struct of_device_id *match; ++ int ret; ++ ++ match = of_match_device(i2c_mtk_dt_ids, &pdev->dev); ++ ++ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); ++ if (!res) { ++ dev_err(&pdev->dev, "no memory resource found\n"); ++ return -ENODEV; ++ } ++ ++ i2c = devm_kzalloc(&pdev->dev, sizeof(struct mtk_i2c), GFP_KERNEL); ++ if (!i2c) { ++ dev_err(&pdev->dev, "failed to allocate i2c_adapter\n"); ++ return -ENOMEM; ++ } ++ ++ i2c->base = devm_ioremap_resource(&pdev->dev, res); ++ if (IS_ERR(i2c->base)) ++ return PTR_ERR(i2c->base); ++ ++ i2c->clk = devm_clk_get(&pdev->dev, NULL); ++ if (IS_ERR(i2c->clk)) { ++ dev_err(&pdev->dev, "no clock defined\n"); ++ return -ENODEV; ++ } ++ clk_prepare_enable(i2c->clk); ++ i2c->dev = &pdev->dev; ++ ++ if (of_property_read_u32(pdev->dev.of_node, ++ "clock-frequency", &i2c->cur_clk)) ++ i2c->cur_clk = 100000; ++ ++ adap = &i2c->adap; ++ adap->owner = THIS_MODULE; ++ adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD; ++ adap->algo = &mtk_i2c_algo; ++ adap->retries = 3; ++ adap->dev.parent = &pdev->dev; ++ i2c_set_adapdata(adap, i2c); ++ adap->dev.of_node = pdev->dev.of_node; ++ strlcpy(adap->name, dev_name(&pdev->dev), sizeof(adap->name)); ++ adap->quirks = &mtk_i2c_quirks; ++ ++ platform_set_drvdata(pdev, i2c); ++ ++ mtk_i2c_init(i2c); ++ ++ ret = i2c_add_adapter(adap); ++ if (ret < 0) { ++ dev_err(&pdev->dev, "failed to add adapter\n"); ++ clk_disable_unprepare(i2c->clk); ++ return ret; ++ } ++ ++ dev_info(&pdev->dev, "clock %uKHz, re-start not support\n", ++ i2c->cur_clk/1000); ++ ++ return ret; ++} ++ ++static int mtk_i2c_remove(struct platform_device *pdev) ++{ ++ struct mtk_i2c *i2c = platform_get_drvdata(pdev); ++ ++ i2c_del_adapter(&i2c->adap); ++ clk_disable_unprepare(i2c->clk); ++ ++ return 0; ++} ++ ++static struct platform_driver mtk_i2c_driver = { ++ .probe = mtk_i2c_probe, ++ .remove = mtk_i2c_remove, + .driver = { + .owner = THIS_MODULE, + .name = "i2c-mt7621", -+ .of_match_table = i2c_rt_dt_ids, ++ .of_match_table = i2c_mtk_dt_ids, + }, +}; + -+static int __init i2c_rt_init (void) ++static int __init i2c_mtk_init (void) +{ -+ return platform_driver_register(&rt_i2c_driver); ++ return platform_driver_register(&mtk_i2c_driver); +} ++subsys_initcall(i2c_mtk_init); + -+static void __exit i2c_rt_exit (void) ++static void __exit i2c_mtk_exit (void) +{ -+ platform_driver_unregister(&rt_i2c_driver); ++ platform_driver_unregister(&mtk_i2c_driver); +} -+module_init (i2c_rt_init); -+module_exit (i2c_rt_exit); ++module_exit(i2c_mtk_exit); + +MODULE_AUTHOR("Steven Liu "); +MODULE_DESCRIPTION("MT7621 I2c host driver");