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Fri, 14 Dec 2012 20:54:02 +0900 (KST) Received: from rajeshwari-linux.sisodomain.com ([107.108.215.115]) by mmp2.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0MF000GYFRKI4870@mmp2.samsung.com> for u-boot@lists.denx.de; Fri, 14 Dec 2012 20:54:02 +0900 (KST) From: Rajeshwari Shinde To: u-boot@lists.denx.de Date: Fri, 14 Dec 2012 17:26:18 +0530 Message-id: <1355486189-432-5-git-send-email-rajeshwari.s@samsung.com> X-Mailer: git-send-email 1.7.4.4 In-reply-to: <1355486189-432-1-git-send-email-rajeshwari.s@samsung.com> References: <1355486189-432-1-git-send-email-rajeshwari.s@samsung.com> DLP-Filter: Pass X-MTR: 20000000000000000@CPGS X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrLLMWRmVeSWpSXmKPExsWyRsSkSjdK+HSAwdEmG4u3ezvZHRg9zt7Z wRjAGMVlk5Kak1mWWqRvl8CVcfjBDvaC+8oVX99+YmtgPCnTxcjJISFgIrHo0FFGCFtM4sK9 9WxdjFwcQgJLGSVOTfvKClN0/8ItFojEdEaJtn/72CGcVUwS3UvamUGq2ASMJLaenAY2SkRA QuJX/1Uwm1kgRuL1/h9sILawgJXEsoVLwepZBFQlZh1pBbN5BdwkTrbcZ4fYpiBxbCrEZk4B d4mTb+6B1QgB1azoWcYG0Ssg8W3yIaCLOIDqZSU2HWAGuUdC4DKbxL2ZC6HekZQ4uOIGywRG 4QWMDKsYRVMLkguKk9JzjfSKE3OLS/PS9ZLzczcxAsPw9L9n0jsYVzVYHGIU4GBU4uH9IHQq QIg1say4MvcQowQHs5IIr+QRoBBvSmJlVWpRfnxRaU5q8SFGH6BLJjJLiSbnA2MkryTe0NjE 3NTY1NLIyMzUFIewkjhvs0dKgJBAemJJanZqakFqEcw4Jg5OqQZGuQs60U6efMu2f4upCIrW nq89TWPmLw675elPI7fKbzeMWsDNv9pw21pnCccrH/YeOmi6uLTM8JL1qah9bbY7FpyoufT9 0bf3L2cb3+9Zwn9491Ld3bpOWSwPtm3Ji1qy5kbgwpmr7fWO3TnOoVUtff/SvYkn17zeGlxe 9jnaxf7cbL51ih/+fFFiKc5INNRiLipOBADrS2H8cAIAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFuphkeLIzCtJLcpLzFFi42I5/e+xoG6U8OkAg3V3dS3e7u1kd2D0OHtn B2MAY1QDo01GamJKapFCal5yfkpmXrqtkndwvHO8qZmBoa6hpYW5kkJeYm6qrZKLT4CuW2YO 0FglhbLEnFKgUEBicbGSvh2mCaEhbroWMI0Rur4hQXA9RgZoIGENY8bhBzvYC+4rV3x9+4mt gfGkTBcjJ4eEgInE/Qu3WCBsMYkL99azdTFycQgJTGeUaPu3jx3CWcUk0b2knRmkik3ASGLr yWmMILaIgITEr/6rYDazQIzE6/0/2EBsYQEriWULl4LVswioSsw60gpm8wq4SZxsuc8OsU1B 4tjUr6wgNqeAu8TJN/fAaoSAalb0LGObwMi7gJFhFaNoakFyQXFSeq6RXnFibnFpXrpecn7u JkZwkD+T3sG4qsHiEKMAB6MSD+8HoVMBQqyJZcWVuYcYJTiYlUR4JY8AhXhTEiurUovy44tK c1KLDzH6AF01kVlKNDkfGIF5JfGGxibmpsamliYWJmaWOISVxHmbPVIChATSE0tSs1NTC1KL YMYxcXBKNTBKztE31pzvwuYi8vf7y7em2xVXfdp125c1LmSjzvPIz+WFi3J6Y49/L1sRXNpz WCs2z12Pyati6tG87bO+a7IfV3c08bx6QbJmD88/7ksqrz4//6YTeLUqMDz7eWhY1Urd+wXT D925WF256v/JtVf8ha6pOlo/2bU8NyUrsI83Q2JX8mf12FdKLMUZiYZazEXFiQAhmB6TnwIA AA== X-CFilter-Loop: Reflected Cc: patches@linaro.org Subject: [U-Boot] [PATCH 05/16] I2C: Driver changes for FDT support X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.11 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: u-boot-bounces@lists.denx.de Errors-To: u-boot-bounces@lists.denx.de Functions added to get the I2C bus number and reset I2C bus using FDT node. Signed-off-by: Rajeshwari Shinde Acked-by: Simon Glass Acked-by: Heiko Schocher --- Changes in V1: -Rebased on latest u-boot-samsung drivers/i2c/s3c24x0_i2c.c | 83 ++++++++++++++++++++++++++++++++++++++++++++- drivers/i2c/s3c24x0_i2c.h | 8 ++++ include/i2c.h | 26 ++++++++++++++ 3 files changed, 116 insertions(+), 1 deletions(-) diff --git a/drivers/i2c/s3c24x0_i2c.c b/drivers/i2c/s3c24x0_i2c.c index 9bc4c7f..94a093e 100644 --- a/drivers/i2c/s3c24x0_i2c.c +++ b/drivers/i2c/s3c24x0_i2c.c @@ -27,9 +27,11 @@ */ #include +#include #ifdef CONFIG_EXYNOS5 #include #include +#include #else #include #endif @@ -60,7 +62,14 @@ #define I2C_TIMEOUT 1 /* 1 second */ -static unsigned int g_current_bus; /* Stores Current I2C Bus */ +/* + * For SPL boot some boards need i2c before SDRAM is initialised so force + * variables to live in SRAM + */ +static unsigned int g_current_bus __attribute__((section(".data"))); +static struct s3c24x0_i2c_bus i2c_bus[CONFIG_MAX_I2C_NUM] + __attribute__((section(".data"))); +static int i2c_busses __attribute__((section(".data"))); #ifndef CONFIG_EXYNOS5 static int GetI2CSDA(void) @@ -507,4 +516,76 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len) (i2c, I2C_WRITE, chip << 1, &xaddr[4 - alen], alen, buffer, len) != 0); } + +#ifdef CONFIG_OF_CONTROL +void board_i2c_init(const void *blob) +{ + + int node_list[CONFIG_MAX_I2C_NUM]; + int count, i; + + count = fdtdec_find_aliases_for_id(blob, "i2c", + COMPAT_SAMSUNG_S3C2440_I2C, node_list, + CONFIG_MAX_I2C_NUM); + for (i = 0; i < count; i++) { + struct s3c24x0_i2c_bus *bus; + int node = node_list[i]; + + if (node <= 0) + continue; + bus = &i2c_bus[i]; + bus->regs = (struct s3c24x0_i2c *) + fdtdec_get_addr(blob, node, "reg"); + bus->id = pinmux_decode_periph_id(blob, node); + bus->node = node; + bus->bus_num = i2c_busses++; + exynos_pinmux_config(bus->id, 0); + } + +} + +static struct s3c24x0_i2c_bus *get_bus(unsigned int bus_idx) +{ + if (bus_idx < i2c_busses) + return &i2c_bus[bus_idx]; + debug("Undefined bus: %d\n", bus_idx); + return NULL; +} + +int i2c_get_bus_num_fdt(int node) +{ + int i; + + for (i = 0; i < i2c_busses; i++) { + if (node == i2c_bus[i].node) + return i; + } + + debug("%s: Can't find any matched I2C bus\n", __func__); + return -1; +} + +int i2c_reset_port_fdt(const void *blob, int node) +{ + struct s3c24x0_i2c_bus *i2c; + + int bus; + + bus = i2c_get_bus_num_fdt(node); + if (bus < 0) { + debug("could not get bus for node %d\n", node); + return -1; + } + i2c = get_bus(bus); + if (!i2c) { + debug("get_bus() failed for node node %d\n", node); + return -1; + } + + i2c_ch_init(i2c->regs, CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE); + + return 0; +} +#endif + #endif /* CONFIG_HARD_I2C */ diff --git a/drivers/i2c/s3c24x0_i2c.h b/drivers/i2c/s3c24x0_i2c.h index 2dd4b06..1243bf1 100644 --- a/drivers/i2c/s3c24x0_i2c.h +++ b/drivers/i2c/s3c24x0_i2c.h @@ -30,4 +30,12 @@ struct s3c24x0_i2c { u32 iicds; u32 iiclc; }; + +struct s3c24x0_i2c_bus { + int node; /* device tree node */ + int bus_num; /* i2c bus number */ + struct s3c24x0_i2c *regs; + enum periph_id id; +}; + #endif /* _S3C24X0_I2C_H */ diff --git a/include/i2c.h b/include/i2c.h index 16f099d..c60d075 100644 --- a/include/i2c.h +++ b/include/i2c.h @@ -262,4 +262,30 @@ extern int get_multi_scl_pin(void); extern int get_multi_sda_pin(void); extern int multi_i2c_init(void); #endif + +/** + * Get FDT values for i2c bus. + * + * @param blob Device tree blbo + * @return the number of I2C bus + */ +void board_i2c_init(const void *blob); + +/** + * Find the I2C bus number by given a FDT I2C node. + * + * @param blob Device tree blbo + * @param node FDT I2C node to find + * @return the number of I2C bus (zero based), or -1 on error + */ +int i2c_get_bus_num_fdt(int node); + +/** + * Reset the I2C bus represented by the given a FDT I2C node. + * + * @param blob Device tree blbo + * @param node FDT I2C node to find + * @return 0 if port was reset, -1 if not found + */ +int i2c_reset_port_fdt(const void *blob, int node); #endif /* _I2C_H_ */