diff options
Diffstat (limited to 'src/drivers/i2c/ww_ring/ww_ring.c')
| -rw-r--r-- | src/drivers/i2c/ww_ring/ww_ring.c | 99 |
1 files changed, 74 insertions, 25 deletions
diff --git a/src/drivers/i2c/ww_ring/ww_ring.c b/src/drivers/i2c/ww_ring/ww_ring.c index b074576914..e1f255a858 100644 --- a/src/drivers/i2c/ww_ring/ww_ring.c +++ b/src/drivers/i2c/ww_ring/ww_ring.c @@ -27,6 +27,7 @@ */ #include <console/console.h> +#include <delay.h> #include <device/i2c.h> #include <string.h> @@ -43,6 +44,7 @@ #define LP55231_ENGCTRL2_REG 0x01 #define LP55231_D1_CRT_CTRL_REG 0x26 #define LP55231_MISC_REG 0x36 +#define LP55231_VARIABLE_REG 0x3c #define LP55231_RESET_REG 0x3d #define LP55231_ENG1_PROG_START 0x4c #define LP55231_PROG_PAGE_REG 0x4f @@ -55,11 +57,22 @@ #define LP55231_ENGCTRL1_CHIP_EN 0x40 #define LP55231_ENGCTRL1_ALL_ENG_GO 0x2a +/* LP55231_ENGCTRL2_REG fields. */ +#define LP55231_ENGCTRL2_ALL_DISABLE 0 +#define LP55231_ENGCTRL2_ALL_LOAD 0x15 +#define LP55231_ENGCTRL2_ALL_RUN 0x2a + /* LP55231_MISC_REG fields. */ #define LP55231_MISC_AUTOINCR (1 << 6) #define LP55231_MISC_PUMP_1X (1 << 3) #define LP55231_MISC_INT_CLK (3 << 0) +/* + * LP55231_VARIABLE_REG cookie value. It indicates to depthcharge that the + * ring has been initialized by coreboot. + */ +#define LP55231_VARIABLE_COOKIE 0xb4 + /* Goes into LP55231_RESET_REG to reset the chip. */ #define LP55231_RESET_VALUE 0xff @@ -224,13 +237,25 @@ static int ledc_read(TiLp55231 *ledc, uint8_t addr, uint8_t *data) } /* - * Reset transaction is expected to result in a failing i2c command, - * no need to return a value. + * Reset transaction is expected to result in a failing i2c command. But even + * before trying it, read the reset register, which is supposed to always + * return 0. If this fails - there is no lp55231 at this address. + * + * Return 0 on success, -1 on failure to detect controller. */ -static void ledc_reset(TiLp55231 *ledc) +static int ledc_reset(TiLp55231 *ledc) { uint8_t data; + data = ~0; + ledc_read(ledc, LP55231_RESET_REG, &data); + if (data) { + printk(BIOS_WARNING, + "WW_RING: no controller found at address %#2.2x\n", + ledc->dev_addr); + return -1; + } + data = LP55231_RESET_VALUE; ledc_write(ledc, LP55231_RESET_REG, &data, 1); @@ -241,6 +266,7 @@ static void ledc_reset(TiLp55231 *ledc) * fails. */ ledc_read(ledc, LP55231_RESET_REG, &data); + return 0; } /* @@ -271,22 +297,32 @@ static void ledc_write_program(TiLp55231 *ledc, uint8_t load_addr, program, segment_size); count -= segment_size; + program += segment_size; page_offs = 0; page_num++; } } +static void ledc_write_engctrl2(TiLp55231 *ledc, uint8_t value) +{ + ledc_write(ledc, LP55231_ENGCTRL2_REG, &value, 1); + udelay(1500); +} + /* Run an lp55231 program on a controller. */ static void ledc_run_program(TiLp55231 *ledc, const TiLp55231Program *program_desc) { - uint8_t data; int i; + uint8_t data; + + /* All engines on hold. */ + data = LP55231_ENGCTRL1_CHIP_EN; + ledc_write(ledc, LP55231_ENGCTRL1_REG, &data, 1); + + ledc_write_engctrl2(ledc, LP55231_ENGCTRL2_ALL_DISABLE); + ledc_write_engctrl2(ledc, LP55231_ENGCTRL2_ALL_LOAD); - data = 0; - ledc_write(ledc, LP55231_ENGCTRL2_REG, &data, 1); - data = 0x15; - ledc_write(ledc, LP55231_ENGCTRL2_REG, &data, 1); ledc_write_program(ledc, program_desc->load_addr, program_desc->program_text, program_desc->program_size); @@ -295,10 +331,9 @@ static void ledc_run_program(TiLp55231 *ledc, ledc_write(ledc, LP55231_ENG1_PROG_START + i, program_desc->engine_start_addr + i, 1); - data = 0; - ledc_write(ledc, LP55231_ENGCTRL2_REG, &data, 1); - data = 0x2a; - ledc_write(ledc, LP55231_ENGCTRL2_REG, &data, 1); + data = LP55231_ENGCTRL1_CHIP_EN | LP55231_ENGCTRL1_ALL_ENG_GO; + ledc_write(ledc, LP55231_ENGCTRL1_REG, &data, 1); + ledc_write_engctrl2(ledc, LP55231_ENGCTRL2_ALL_RUN); } /* @@ -307,19 +342,15 @@ static void ledc_run_program(TiLp55231 *ledc, */ static int ledc_init_validate(TiLp55231 *ledc) { - const uint8_t ctrl1_reset[] = { - 0, - LP55231_ENGCTRL1_CHIP_EN, - LP55231_ENGCTRL1_CHIP_EN | LP55231_ENGCTRL1_ALL_ENG_GO - }; uint8_t data; int i; - ledc_reset(ledc); + if (ledc_reset(ledc)) + return -1; - /* Set up all engines to run. */ - for (i = 0; i < ARRAY_SIZE(ctrl1_reset); i++) - ledc_write(ledc, LP55231_ENGCTRL1_REG, ctrl1_reset + i, 1); + /* Enable the chip, keep engines in hold state. */ + data = LP55231_ENGCTRL1_CHIP_EN; + ledc_write(ledc, LP55231_ENGCTRL1_REG, &data, 1); /* * Internal clock, 3.3V output (pump 1x), autoincrement on multibyte @@ -334,7 +365,6 @@ static int ledc_init_validate(TiLp55231 *ledc) * value at reset. */ for (i = 0; i < 9; i++) { - data = 0; ledc_read(ledc, LP55231_D1_CRT_CTRL_REG + i, &data); if (data != LP55231_CRT_CTRL_DEFAULT) { printk(BIOS_WARNING, @@ -344,6 +374,13 @@ static int ledc_init_validate(TiLp55231 *ledc) } } + /* + * Signal Depthcharge that the controller has been initiazed by + * coreboot. + */ + data = LP55231_VARIABLE_COOKIE; + ledc_write(ledc, LP55231_VARIABLE_REG, &data, 1); + return 0; } @@ -364,9 +401,13 @@ int ww_ring_display_pattern(unsigned i2c_bus, enum VbScreenType_t screen_type) for (i = 0; i < ARRAY_SIZE(state_programs); i++) if (state_programs[i].vb_screen == screen_type) { int j; - for (j = 0; j < WW_RING_NUM_LED_CONTROLLERS; j++) + + for (j = 0; j < WW_RING_NUM_LED_CONTROLLERS; j++) { + if (!lp55231s[j].dev_addr) + continue; ledc_run_program(lp55231s + j, state_programs[i].programs[j]); + } return 0; } @@ -393,9 +434,17 @@ static void ww_ring_init(unsigned i2c_bus) if (!ledc_init_validate(ledc)) count++; + else + ledc->dev_addr = 0; /* Mark disabled. */ } printk(BIOS_INFO, "WW_RING: initialized %d out of %d\n", count, i); - if (count != i) - printk(BIOS_WARNING, "WW_RING: will keep going anyway\n"); + if (count != i) { + if (count) + printk(BIOS_WARNING, + "WW_RING: will keep going anyway\n"); + else + printk(BIOS_WARNING, + "WW_RING: LED ring not present\n"); + } } |